WO1989000971A1

WO1989000971A1 - Process and device for doffing yarn bobbins

Info

Publication number: WO1989000971A1
Application number: PCT/EP1988/000612
Authority: WO
Inventors: Ludwig Resch
Original assignee: Ludwig Resch
Priority date: 1987-08-06
Filing date: 1988-07-08
Publication date: 1989-02-09
Also published as: EP0370039A1; EP0370039B1; DE8816477U1; AU1989088A; ATE80122T1; DE3874347D1

Abstract

In a process and device for doffing yarn bobbins, bobbin charging can be carried out automatically. The doffing device has a support frame in which one or more take-up mandrels (40) are held on one side by a mandrel-holding device (41-48). A handling device (70-73) which accepts a full bobbin has a coupling device (71) with which it can be coupled to the take-up mandrel. After coupling, the mandrel-holding device (41-48) is removed from the take-up mandrel (40) and the full yarn bobbin can be slid onto the take-up mandrel.

Description

Method and device for yarn withdrawal

The present invention relates to a method for operating a

Take-off device, which is particularly suitable for yarn packages and a device for carrying out this method.

Textile yarns such as B. yarns made of natural fibers such as wool, cotton, or synthetic fibers such as polyamide, polyester and the like, or yarns made from a mixture of such fibers, are usually wound onto tubes during production, these tubes mostly made of paper, cardboard, plastic or the like consist. The yarn packages produced thereby often have considerable dimensions and a weight, in particular if the yarn is intended for industrial further processing, and a weight which can be up to 20 kg and in some cases up to 40 kg and more.

In the industrial processing of the yarns, ie z. B. if the yarns have to be subjected to further processing steps, or in the manufacture of textile products from these yarns, the yarns must be removed from the bobbins in a suitable manner. It is known to use take-off devices for bobbins of thread which have a holding mandrel onto which the bobbin with the opening in the sleeve is pushed. The trigger itself takes place overhead, ie when the spool is stationary, so that the mandrel must be supported on one side.

If several yarns are to be processed simultaneously for reasons of productivity, or, if for the manufacture of a textile product, e.g. B. a carpet, several yarns are required at the same time, the known Abzugvorrich¬ lines have several mandrels, which are arranged next to and / or one above the other.

In order to increase productivity, the textile industry places great value on the fact that the processing of yarns or the further processing of yarns can take place as continuously as possible. This means that the supply of yarn to the further processing point must not be interrupted when a bobbin has run out. To ensure the continuous supply of yarn, take-off devices are used in which at least twice as many mandrels are provided as yarns are required. In these deduction devices, a second mandrel with a replacement spool is then arranged next to or above the mandrel on which the bobbin is located, the yarn of which is being drawn off. The yarn end of the first bobbin, which is located on the first mandrel, is connected to the beginning of the yarn of the second bobbin, which is located on the second mandrel. As soon as the first spool has run out, the trigger automatically jumps to the second spool. Then, while the second bobbin is running, the first bobbin can be exchanged, the beginning of its yarn then being connected again to the end of the yarn of the previous second bobbin. In this way, a continuous yarn run can be ensured.

The problem with all these take-off devices is that the coils are replaced. When the yarn is drawn off axially (stationary bobbin) the yarn rotates around the respective bobbin at a relatively high speed. This forms a so-called yarn balloon or thread balloon, which makes access to the holding mandrels, in which the bobbins have to be changed, considerably more difficult. It is therefore still not possible to automate such extraction devices. The extraction devices must rather be monitored by an operator who, for example, B. when a bobbin expires, attaches a new bobbin to the released mandrel and connects the beginning of its yarn to the yarn end of the assigned bobbin.

This manual changing of the bobbins is a problem with bobbins with

Weight is a very unpleasant heavy work. Furthermore, the need to change the bobbins manually prevents a rationalization of the yarn processing.

The present invention therefore has as its object to provide a method with which an efficient operation of yarn take-off devices is possible. Furthermore, the invention has the task of creating a trigger device that can be operated efficiently and largely without the use of workers.

According to the invention, this object is achieved by the method according to claim 1. The trigger device according to the invention is the subject of claim 22. Advantageous embodiments of the invention are the subject of the dependent claims.

The method according to the invention has significant advantages in the operation of a take-off device of the type mentioned at the outset. It has not hitherto been possible to design an automatic placement of bobbins on a take-off device in such a way that this take-up can also be carried out while yarn is being drawn from individual mandrels. This is because, due to the one-sided mounting of the holding mandrels, the yarn spools always had to be pushed on from the take-off side, which was significantly hampered by the pulled-off yarns themselves. According to the present invention, a mandrel is now used which has a mandrel holding device which can be removed from the mandrel. The holding of the mandrel when the mandrel holding device is removed is ensured by a handling device which holds the mandrel in its original position. The handling device, which preferably has a manipulation mandrel, carries the coil which is to be applied to the receiving mandrel. This spool is then pushed onto the holding mandrel by the manipulator 10 -dLiυimtlorn, an empty sleeve which may be present being thrown off over the free end of the holding mandrel.

This method makes it possible for the first time to insert the p-coil from the side of the draw-off device opposite the take-off side. As a result, the yarn take-off on the take-off side is not hindered by the attachment process itself and it is therefore possible to use an automated handling device.

20th

According to a preferred embodiment of the method, the empty tube is initially held in a horizontal position during the ejection and is then dropped from this position, so that the tube falls parallel to the yarn take-off direction. This has the main advantage that the replacement of the coils themselves

25 thin yarns can also be made when yarn is pulled from other mandrels. It has been found that when the empty tube is dropped, the yarn tears above all when the empty tube falls in a position in which its longitudinal axis is inclined with respect to the horizontal. The rotating, peeled

30 yarn then strikes the tube, possibly even wrapping around the tube and then tearing. This either leads to errors in the textile products produced or the yarn processing is interrupted. However, if you drop the tube in a horizontal position, the yarn can briefly drop the tube

35 touch, and is then deflected from the sleeve in a manner that does not break the yarn. The connection between the holding mandrel and the manipulating mandrel can preferably be non-positive as well as preferably positive.

With the method according to the invention described above, it is also possible to carry out a continuous yarn draw-off, as is known in principle in the prior art, as was pointed out above. In this case, two mandrels are provided for each withdrawal point, which preferably lie next to one another and / or one above the other and whose coils are assigned to one another. This assignment means that the yarn end of the first bobbin is connected to the yarn start of the second bobbin and that the first bobbin is drawn off. As soon as the first bobbin has run out, the take-off then automatically jumps over to the second bobbin and the first bobbin can then be exchanged and its beginning of the twine can be connected to the end of the twine of the twine, whereby the process then takes place in reverse.

A particular object of the invention is also that Verfah reindeer and the apparatus for removing yarn to be designed so that extractors are built ^'to having gen a significantly reduced footprint compared to the known Abzugsvorrichtun¬ and particularly suitable for continuous withdrawal own.

According to a particularly preferred embodiment of the present invention, the method according to the invention is therefore carried out in such a way that two spools are arranged on the mandrel at the same time, the yarn end of the front spool in the draw-off direction with the yarn beginning closer to the mandrel holding device located coil is connected.

In this embodiment of the method according to the invention, a continuous yarn draw-off is ensured without having to provide twice as many mandrels as there are draw-off points. This embodiment therefore reduces the space requirement of continuously working Yarn take-off devices achieved, which can already be described as dramatic. So far z. For example, in the prior art, 48 receiving mandrels were required in order to provide 24 continuously running yarns. According to this particular embodiment of the method and the device according to the invention, only 24 receiving mandrels, ie half, are now required. Since the space requirement of a machine is based primarily on the number of mandrels, and not on their length, the space requirement of a continuously operating holding device is practically halved.

The change is then carried out in a simple manner as follows: as soon as the yarn has run out of the front bobbin, a new bobbin with the handling device and the manipulation mandrel is pushed onto the take-up mandrel. The empty sleeve of the coil lying foremost is forward, i. H. ejected in the withdrawal direction. During this whole activity, the withdrawal process is continued on the same mandrel without impairing this process. The empty tube is pushed forward and preferably first held in a horizontal position according to the procedure described. The empty tube is then dropped and can be removed from the area of the machine using suitable devices.

According to a further preferred embodiment of the method, the yarn start and yarn end of the successive bobbins are connected automatically by a yarn connecting device, ie. H. without manual handling, this automatic yarn connection preferably being carried out as a pneumatic splice.

It is further preferred that the start and / or end of a bobbin to be plugged on or a bobbin located on the take-up mandrel is automatically recognized and preferably detected by a yarn holding device. It is further preferred that the yarn end of a bobbin to be plugged on is held in a yarn gluing device which is arranged on the take-off device until the next bobbin is put on again.

According to a preferred embodiment of the method, which serves in particular a rational procedure, a handling device with a manipulation mandrel can supply a plurality of receiving mandrels with new yarn spools, in which case the handling device with the manipulation mandrel is preferably arranged to be movable.

Because of the complexity of the aforementioned method steps, it is preferable that the control of the process sequence is carried out by one or more data processing units.

In order to enable a fully automatic operation of the take-off device, it is further preferred that the handling device is automatically supplied with full bobbins of thread to be plugged on. This can e.g. B. happen by a movable handling device drives a spool supply magazine, and with the manipulation mandrel receives a full spool or several full spools of this spool supply magazine.

The trigger device according to the invention, which is suitable for carrying out the method according to the invention, has a support frame to which one or more mandrels, which in the latter case are preferably arranged side by side and / or one above the other, are fastened. Of course, offset arrangements are also possible. The mandrel or mandrels are held on one side in mandrel holding devices and take up the spools of thread. Each mandrel can be connected to a handling device by means of a coupling device. The coupling device and the handling devices are designed so that the mandrel holding device is moved away from the holding mandrel can, and the mandrel is then held by the handling device.

It is preferred that the handling device is movable with respect to the mandrels. According to a preferred embodiment, the handling device is moved in a plane which is perpendicular to the axes of the holding mandrels, namely once in the horizontal direction, i. H. in the x direction and in the vertical direction, d. H. in the y direction. According to an embodiment to be preferred, a reference point is then defined, from which the movement of the handling device in the x direction and in the y direction is counted in step pulses. In this way, it can always be determined exactly where the handling device is in relation to the position of the holding mandrels. According to a preferred embodiment, con

15 troll sensors are provided, with which the calculated position and the actual position of the handling device can be compared with one another. For example, microswitches or optical sensors can be used as control sensors. The approach of a mandrel can then z. B. be designed so that the

20 handling device a certain area in the aforementioned level, for. B. starts a window of 10 x 10 πm, in which the calculated position of the mandrel is. If the pick-up mandrel is then not found in this area, an alarm is triggered. Furthermore, the handling device must be moved in this way

25 that the coupling devices can be engaged, e.g. a movement in the direction of the axis of the receiving mandrel may be necessary.

The handling device preferably has a manipulation

30 thorn on, the diameter of which is such that it is smaller than the inner diameter of the empty tube of a bobbin. As a result, the yarn package to be changed can be carried directly by the manipulation mandrel and then preferably pushed onto the mandrel with a sliding device.

35 In order to ensure that the empty sleeve falls horizontally when an empty sleeve is pushed off the mandrel, a sleeve holding device is preferably provided which initially holds the empty sleeve in a horizontal position when it is pushed off the holding mandrel. This holding function must be terminated in a short period of time, ie practically suddenly, so that the sleeve can then fall down from this horizontal position and fall with its sleeve longitudinal axis approximately parallel to the horizontal.

Means are preferably provided for the thrown

To catch sleeves, which are preferably arranged under each mandrel. This has the advantage that the empty tube must at most pass through a rotating yarn balloon. The sleeves are preferably with slides and / or conveyor belts and the like. same transported to a sleeve collecting device, from which the sleeves can then be removed.

The function of the sleeve holding device is preferably so that is, by a sort of rod caused by an elongated body, ^• which is arranged in a bore of the arbor. The rod can be extended in the withdrawal direction from the holding mandrel, which is preferably brought about by the fact that this elongated body is provided with a corresponding driver device.

A tension spring is preferably provided in the bore of the holding mandrel, which is stretched when the elongate body is extended from the holding mandrel.

According to a further preferred embodiment, the sleeve holding device has a spring-loaded latching device, which causes the driver device to disengage as soon as the elongate body has been moved out of the holding mandrel by a certain distance. By disengaging the driver device, the elongated body can be pulled back into the holding mandrel by the action of the tension spring mounted in the holding mandrel. This

Withdraw suddenly happens so that the sleeve is in its position not significantly changed during the retraction process. As soon as the body is withdrawn, the sleeve is still in a horizontal position and falls down from this position.

According to a preferred embodiment, the device is designed so that a continuous yarn draw-off is possible. As is known in the prior art for conventional trigger devices, this can be done by providing twice as many mandrels as trigger parts are required. In this

In this case, there is the advantage over the known take-off devices that the yarn packages on these take-off devices can be changed in a simple and efficient manner. It should be particularly mentioned that it is possible in this way to convert existing and operating extraction devices in such a way that they are suitable for the implementation of the invention

Process are suitable. This means that even with such retooled trigger devices, a rational change of

Spools of thread is possible.

As already mentioned, however, it is also a particular concern of the present invention to provide a trigger device which requires less space than the prior art. According to a particular embodiment of the invention, the take-off device is therefore designed in such a way that the holding mandrels can hold two coils one behind the other. In the case of extensive take-off devices or in the case of small coils and with certain types of take-off, it can also be expedient to design the holding mandrel in such a way that three or more coils can be taken up.

For the continuous yarn take-off, the take-off device is preferably provided with an automatic yarn connecting device. This yarn connection device connects the yarn end of a first bobbin to the yarn start of a second bobbin assigned to it. It should be noted that this is automatic Yarn connecting device can be used both if, according to a preferred embodiment of the invention, two or more yarn spools assigned to one another are arranged on the same mandrel. However, it is also possible to use such a yarn connecting device if the two coils assigned to one another are held on holding mandrels arranged next to one another or one above the other. Such a design can, for. B. may be necessary if, for reasons of space, a take-off device with two coils arranged one behind the other is not possible.

It is further preferred that a device for searching and detecting the yarn end or the yarn start of a yarn spool is provided. Such a device is particularly useful if a continuous yarn flow is to be ensured.

However, it can also be used if the yarn is not processed continuously, e.g. B. then the beginning of the yarn

Further processing point.

The search process is preferably carried out in such a way that the yarn finder can be moved over the area of the bobbin at which the beginning or end of the yarn are to be expected, the bobbin preferably being rotated in the process.

A particularly important concern of the invention is to provide such a, reliably working device for finding the beginning or end of yarn. Since such a device for finding yarn can not only be used in take-off devices, independent protection may be claimed for this aspect of the invention.

The yarn finder according to the invention is designed in such a way that it has an area in which there is a negative pressure relative to the atmospheric pressure, through which the yarn end or the yarn start is sucked in. In order to facilitate the suction process, it is particularly preferable for hairy and heavy yarns that a device is provided that can be integrated directly into the yarn finder, the spool or generally the area in which, for. B. for a textile product or the like, a yarn start or a yarn end is sought, blown with compressed air to raise the yarn.

According to an alternative, also preferred embodiment of the invention, a brush is provided which is guided over the bobbin and can brush up the beginning of the yarn. It has been shown that particularly hairy and / or heavy yarns can be detached from the spool without any problems.

According to a preferred embodiment of the yarn finder, the vacuum region is designed as a channel into which the yarn is sucked in. This negative pressure is preferably generated by compressed air which is fed to the yarn finder and which flows through an appropriately designed nozzle in order to generate the negative pressure. The channel is preferably arranged in the interior of this nozzle.

However, it is also readily possible to generate the vacuum in a different way, e.g. B. by the yarn finder is equipped with an appropriate pump. It is also possible to use a centrally acting pump which is connected to the yarn finder or the yarn finders via a hose line.

In particular, in the automatic operation of a take-off device or a machine of whatever type used for textile processing, it is very important that it is reliably established whether the yarn finder according to the invention has actually picked up a yarn. The yarn finder is therefore preferably equipped with a yarn detection device. The presence of the yarn in the channel can be determined in various ways according to the invention. It is preferable to use an optical sensor, e.g. B. a light barrier, which is arranged so that the light flow is interrupted or weakened as soon as the yarn in the corresponding channel is located. It is also possible to build up an electrical field around the channel by means of a suitable coil and to determine the field change due to the yarn being drawn in.

The yarn detection device can determine whether the yarn finder has picked up a yarn. Is this, e.g. B. within a predetermined period of time, the corresponding bobbin or the corresponding textile product for one

10 special manual processing can be discarded.

According to a further preferred embodiment of the yarn finder, it is equipped with a yarn holding device. This yarn holding device allows the yarn to be held in the yarn finder

15 th to further manipulation of the yarn, for. B. to enable insertion into a yarn splicing device or into a yarn clamping device. The advantage of using such a yarn holding device is that relatively high forces can be exerted on the yarn.

20th

According to a preferred embodiment, the yarn holding device, which is preferably assigned to the yarn finder, has a piston which presses the yarn against a suitably shaped counterpart. The piston can be operated electrically, pneumatically or in some other way mechanically.

25

According to a further preferred embodiment, a yarn cutting device is provided, which is preferably also assigned to the yarn finder. By using this yarn cutting device it is possible to shorten the yarns detected with the yarn finder 30 to a uniform length. This facilitates the further processing of the yarns.

The yarn cutting device preferably has a knife actuated by means of a pneumatic piston and a cutting anvil, the yarn being cut between the knife and the cutting anvil becomes. In a take-off device of the type mentioned at the beginning, two yarn finders are preferably used so that the yarn start and

End of yarn can be recognized and detected independently of one another.

In order to guide the yarn finder at the correct distance over the bobbin or the textile product to be examined, the yarn finder preferably has a mechanically or optically or electrically acting sensor which holds the yarn finder at a predetermined distance above the yarn to be searched. It has been shown that, depending on the nature of the yarn, a distance of approximately 1-10 mm, preferably 3-7 mm, preferably approximately 5 mm is appropriate.

According to a further preferred embodiment of the method, which is particularly advantageous in the case of take-off devices with continuous yarn take-off, each take-up mandrel is assigned a yarn clamping device in which the yarn end of the rearmost spool located on the take-up mandrel is held. As a result, the yarn end of the bobbin located on the take-up mandrel can be picked up in a simple manner by a yarn finder or a yarn connecting device if the yarn end of this bobbin is to be connected to the yarn beginning of a further bobbin.

The take-off device is preferably further provided with a magazine device for yarn packages. Such a magazine device, for. B. a coil carriage, can accommodate a large number of coils that can be picked up by the handling device in order to be attached to the mandrels.

If bobbins with yarns of different qualities and / or different colors are required, these yarn bobbins are preferably arranged in different magazine devices, each of which contains only bobbins of the same quality and the same color. The handling device, which in this case is expediently controlled by a data processing device, can then move to the corresponding magazine device and take up the coil required for the respective mandrel. According to an alternative embodiment of the method, coils of different qualities and / or colors can also be arranged in the same magazine device. In this case, it must then be ensured that the handling device is provided with devices which can recognize the quality and / or the color of the respective yarn and which can then select the next required bobbin from the magazine device. Such a magazine device can, for. B. be such that different spools of thread are arranged side by side, which are examined consecutively by the handling device on their nature. The coding of the bobbins can, for. B. via a bar code, the so-called bar code, which is scanned by a corresponding reading device of the handling device. It is also possible, for. B. magnetic strips as a code carrier or a hole coding.

According to one preferred embodiment of the take-off device, which is to be preferred in particular when the coils located in the magazine device are to be picked up one after the other by the handling device, i. H. Thus, without changing their order, a positioning device is provided which brings the coils into a predetermined position for reception by the handling device.

Such a positioning device can ensure that the full bobbin to be picked up is always in the same position, so that the handling device does not have to carry out a search operation, but only has to control the defined position.

The positioning device is preferably designed as a lifting device which lifts the coil to a predetermined height from a lower position from which it is brought out of a magazine device by gravity or by appropriate conveying means. A sensor is preferably provided, which stops this lifting device when the sleeve of the coil has reached a predetermined height. This ensures that the sleeve is always in a position in which a manipulation mandrel of the handling device can be inserted into the sleeve, regardless of the diameter of the thread spool. It is thus possible to use yarn spools of different diameters in the take-off device without the take-off device having to be adapted to the respective diameter of the yarn spool. This is an important step to the aim to achieve a largely automatic operation of Abzugsv ^'orrichtung.

The sensor, which detects that the sleeve is at a predetermined height, can be mechanical or electrical, but is preferably designed optically. An optical sensor is then preferably used, which is arranged in the plane in which the sleeve axis lies and which continuously emits a light signal. During the lifting process, this light signal is first reflected by the yarn package, but as soon as the sleeve is at the level of the sensor, the light beam penetrates through the opening of the sleeve without being reflected. This event is used to shut down the lifting device, and depending on the nature of the device, a larger or smaller distance can be covered in order to determine a final position of the sleeve. The sleeve is then in a position in which the manipulation mandrel can receive the coil.

For reasons of space, the magazine device can be constructed in such a way that the longitudinal axes of the yarn bobbins accommodated in the magazine device lie transversely to the axes of the holding mandrels. In this case, the positioning device can preferably have a device which rotates the coil simultaneously with the lifting.

The positioning device can furthermore have two rollers which are arranged parallel to the longitudinal axis of the yarn package to be picked up. The distance between the rollers is preferably ^' dimensioned in this way. that the yarn spool can rest on these rollers without touching any other parts of the positioning device.

One or both rollers can then be connected to a drive device which sets the rollers and thus the yarn spool on them in rotation. As a result, the yarn package can be rotated in a simple manner, in which case the yarn finding process is then preferably carried out on the positioning device.

As can be seen from the above description of preferred embodiments, the trigger device can have a very complex structure, depending on how many of the described devices are integrated in the trigger device. It is therefore preferable in any case that one or more data processing devices are provided, which preferably control the entire extraction device. Several data processing units can be provided, which are then controlled by a common central data processing unit, or a correspondingly constructed central data processing unit can be provided. The extraction device then preferably has sensors which monitor the correct operation of all devices. The trigger device is preferably monitored and controlled in accordance with a corresponding program which is stored in the data processing device (s).

Furthermore, alarm devices are preferably provided, which cause an acoustic and / or visual alarm to be triggered when one of the devices belonging to the AbzligsDevice device is operated improperly.

The method according to the invention and the device according to the invention described above are suitable for pulling off the yarns overhead. This means that the bobbin stands still and the yarn rotates around the bobbin as it is drawn off. However, it is expressly pointed out that the method according to the invention can also be carried out with radially removable thread spools. In this case, the bobbins rotate and the yarn is drawn off to the side. The trigger device according to the invention can also be designed so that a radial trigger is possible. In this case, constructive care must be taken to ensure that the spool can rotate.

Further advantages and features of the present invention result from the subclaims and the following description of an exemplary embodiment in connection with the drawing.

The following are shown in a schematic representation:

Figure 1 is a view of the trigger device from the side opposite the trigger side.

FIG. 2 shows a top view of the trigger device according to FIG. 1;

FIG. 3 shows a side view of the trigger device according to FIG. 1;

Fig. 4 shows a further side view of the trigger device according to FIG

Fig. 1;

5 shows a detailed view of the support frame, in which three coils are held in the mandrel holding device, and in which the mandrel holding device is released from a coil;

Fig. 6 is a partially schematic sectional view of the

Mandrel of the embodiment of FIG. 1;

FIG. 7 shows an enlarged illustration of the driver device which is arranged in the holding mandrel according to FIG. 6;

Fig. 8 is a schematic diagram of the case of a horizontal inclined empty tube by a yarn balloon;

9 shows a basic sketch of the case of a horizontally oriented empty tube through a yarn balloon;

10 shows a partial side view of the take-off device according to FIG. 1, the manipulation mandrel being coupled to the holding mandrel and a yarn spool being pushed onto the holding mandrel;

FIG. 11 shows a top view of the take-off device in which the bobbin change according to FIG. 10 is carried out;

12a is a sectional view of a yarn finder according to the invention;

12b the connection of the yarn finder with a yarn cutting device;

13 is a schematic representation of the movement of the yarn finder over the yarn spool;

FIG. 14 shows a side view of the game clamping device of the trigger device according to FIG. 1;

FIG. 15 is a plan view of the game clamp device according to FIG. 14;

Fig. 16 is a partial top view of the game clamp device according to FIG. 15, the upper part being omitted here for clarification;

FIG. 17 shows a top view of the game clamp device according to FIG. 14 with the slide withdrawn; FIG.

Fig. 18 is a side and partial view of the support frame and the Handling device before the replacement spool is pushed open and the yarn is connected;

Fig. 19 is a side view corresponding to that of Fig. 18 after the replacement spool has been pushed on, showing how the yarn is held in the yarn clamping device;

20 is a front view of the positioning device;

FIG. 21 shows a side view of the positioning device according to FIG. 20;

22 shows a plan view of the positioning device according to FIGS. 20 and 21;

With reference to the aforementioned figures, an embodiment of the invention is described in which a continuous yarn take-off is implemented, in which two yarn spools can be accommodated on a mandrel.

It is particularly pointed out that the features described in detail below are to be considered as belonging to the invention, and that claims for protection of these features, insofar as they are not contained in the appended claims, can be made by formulating further claims is made.

The trigger device shown in Fig. 1 is generally designated 1. The trigger device has a support frame 2, which in the schematic illustration of FIG. 1 for receiving 24

Holding mandrels 40 are provided, the individual holding mandrels being arranged in a grid, in each of which six holding mandrels are arranged horizontally parallel to one another, and 4 each

Recording domes are arranged vertically parallel one above the other, so that the total number of 24 mandrels mentioned results. Since in the illustrated embodiment each arbor 2 Can take up bobbins 3, the entire take-off device in the form shown can thus hold 48 yarn bobbins.

The bobbin changing device 4 is arranged in front of the support frame 2 and can be moved horizontally, ie in the lateral direction in the direction of the double arrow 5, on a frame part 6. The bobbin changing device has a handling device as well as a splicing device and yarn finder. A control cabinet 7 is likewise arranged on the frame part 6 in FIG. 1 to the left of the supporting frame. This cabinet contains a central data processing device, in this case a central computer that controls the extraction device and / or ^'regulates above all.

On the right side of the support frame in FIG. 1, a magazine device 8 is shown, which in this case is designed as a coil carriage. Various coils 3 are located on the two coil carriages 9 shown. For reasons of space, the coil carriage is arranged such that its longitudinal axis lies parallel to the axes of the holding mandrels. This means that the axes of the coils are arranged offset by 90 to the plane in which the coils are located on the mandrel during the withdrawal. The coils must therefore be rotated before they are placed on the mandrels.

1, FIG. 2 shows how the bobbins are arranged one behind the other on the holding mandrels 40, the yarn being drawn off from the front bobbin 3a, while the rear bobbin 3b is kept as a reserve spool to ensure a continuous yarn run after the yarn has run out of the front spool 3a. This situation is shown in Fig. 2 with reference to the mandrel 40 '. On this mandrel, the empty sleeve 11 can be seen on its front part facing the take-off side, in this case the take-off is already taking place from the rear full yarn spool 3b '. It can also be seen that the bobbin changing device 4 has a mast 12 through which the bobbin changing device is adjustable in height. The height adjustment of the bobbin change

The device can be seen in FIG. 3, which shows a side view of the bobbin changing device.

FIG. 4 shows a further side view, from the side opposite the view in FIG. 3. In this figure it can be seen how the individual coils are arranged on the coil carriage 9.

Fig. 5 shows in a more detailed manner the structure of the support frame and the function of the mandrel holding device.

As can be seen in particular with reference to FIGS. 5 and 10, the supporting frame 2 is constructed from steel profile parts 20 running horizontally transverse to the axis of the receiving mandrel, from vertically running steel profile parts 21 and from steel profile parts 22 running horizontally parallel to the receiving mandrels . The profile parts are welded together in the present case, but it is also possible to provide a screw or other suitable connection.

The vertical and horizontal profile parts of the support frame form individual support frame cutouts, each of which is delimited by two front profile parts 20, two rear profile parts 20, 4 vertical profile parts 21 and four profile parts 22 that run horizontally parallel to the axes of the holding mandrels. In each of these support frame cutouts, a holding mandrel 40 is provided, which is designed for holding two thread spools. In the present case, the holding mandrel essentially consists of a tube, the outer diameter of which is significantly smaller than the inner diameter 32 of the opening of the sleeve 30, on which the yarn is wound into a bobbin. Each mandrel 40 is assigned a mandrel holding device 41 which is held by the supporting frame 2. For this purpose, a guide rod 25 is provided on the support frame and is fastened in brackets 26 on the support frame. In the present case, the guide rod 25 has a circular cross section, but other types of cross section are also possible. Furthermore, a guide profile 27 is provided on the support frame, which in the present case is designed as a U-profile, the U being open towards the bottom.

The mandrel holding device 41 has a vertical support rod 42 which is fastened in a carriage 43, this fastening being able to be carried out by welding, screwing and the like.

The carriage 43 has a horizontally running bore with which the carriage is guided on the guide rod 25. With its upper part, the support rod engages in the guide profile 27.

An upper holding element 44 and a lower holding element 45 are fastened to the support rod 42. The upper holding element 44 is designed so that it can receive the corresponding part of the mandrel with a circular cross section. A lever 46 is pivotally mounted on the lower holding element 45 about an axis 47. A spring 48 engages on the lever 46 and is fastened to the slide 43 of the mandrel holding device. This spring is arranged so that the lever is held in a closed position when the mandrel is carried by the mandrel holder. The angle at which the spring is inserted is also designed so that the lever remains in an open position when the mandrel holding device does not support the mandrel.

Di _e function of the mandrel-holding means is as follows: During normal operation of the mandrel-holding Abzugsvorrichtung--Einrich¬ is processing in the middle of the corresponding Tragrah enausSchnitts and carries the arbor with the two coils thereon. If a spool of thread is to be changed, the mandrel is first removed by the handling device, whose function will be used later is explained. The mandrel therefore remains essentially always in the same place in the support frame. The handling device has an actuating element with which the mandrel holding device can be pushed aside, to the right, as shown in FIG. 5. 5 shows the mandrel holding device 41 'which is in such an open position. When moving the mandrel holding device from the closed position to the right, the lever 46 folds over to the left and releases the holding mandrel. If the mandrel holding device is then pushed back to the holding mandrel, the lever 46 is pushed back by the holding mandrel to its original, vertically upward position and is then held there by the spring 48. In this position, the lever 46 can then hold the mandrel in the predetermined horizontal position together with the holding element 44. As mentioned above, the mandrel has a circular cross section. To prevent the mandrel from moving in the axial direction, a recess 66 is provided at the location of the mandrel that comes into contact with the lever 46, the width of which corresponds to the width of the lever 46, in which this lever then engages.

The holding mandrel has a device for holding the sleeve during the discharge process, which makes the holding mandrel particularly suitable for carrying out the method according to the invention. This sleeve holding device is arranged in the interior of the tubular holding mandrel and has a support rod 51 which has an angle 52 at its front end which serves to adjust the support height of this supporting rod to the upper surface line of the holding mandrel. A spring 53 is arranged in the holding mandrel and is connected to the support rod 51 via a driver device 54. This driver device 54 has a driver lever 55 which is rotatably mounted about the axis 56. A spring 58, which loads a ball 59, is arranged in a bore 57 of the driver device. A projection 60 of the driving lever 55 is supported on this ball. A release pin 61 is arranged in the front part of the receiving mandrel such that its longitudinal axis is parallel to the longitudinal axis of the arbor. The outside diameter of the release pin is smaller than the inside diameter of the bore 57.

The function of this driver device is now as follows: A new thread spool is applied when the front spool has expired, i. that is, only their empty sleeve is still on the mandrel and the deduction from the rear spool takes place. The replacement coil is inventively from behind, ie. H. from the the

Pushed on the mandrel holding device facing side of the holding mandrel. The length of the tension spring 53 and the other dimensions of the holding mandrel are designed such that the driver is grasped by the rear sink from which it is being pulled when this coil has been displaced by about a quarter of its sleeve length. The sleeve of the spool, from which it is being pulled off, thus abuts the driver and pushes it forward, i.e. H. towards the trigger side, whereby the tension spring 53 is stretched. The driver then moves forward with the support rod attached to it in the arbor, whereby the empty sleeve to be pushed off is carried by the support rod. As soon as the driver reaches the front end of the arbor, the trigger pin 61 engages in the bore 57 and presses the projection of the driver 60 and the ball 59 back against the action of the spring 58. This causes the carrier to fold down and the holding function through the sleeve of the rear cooking spool, which is now pushed forward, is ended. As a result, the tension spring 53 pulls the driver 54 and the support rod 51 attached to it back into the receiving dome. Due to the large energy stored in the tension spring 53, this back acceleration of the support rod and the driving takes place practically suddenly. The length of time in which the support rod snaps back into the mandrel is in any case so short with a corresponding design of the spring that the empty sleeve pushed down by the mandrel does not change its horizontal position during the snapping back of the mandrel.

This causes the sleeve to drop from a horizontal position. This process of falling down is shown schematically in FIGS. 8 and 9. 8 shows how the empty sleeve falls when it is not initially held in a horizontal position. In this case, the sleeve 11 tilts down at the front, since there it first loses support by the holding mandrel and falls down in a manner inclined to the horizontal. If the thread 10 of the rotating yarn balloon of the rear spool strikes the sleeve, it can wind around the sleeve and tear off. 9 shows how, according to an advantageous embodiment of the method according to the invention, the sleeve is dropped parallel to the horizontal. In this parallel case, due to the then smaller extent of the sleeve in the vertical direction, the likelihood that the yarn rotating around the bobbin will hit the sleeve is much less. Furthermore, there is no risk that the yarn can wrap around the sleeve. Rather, the yarn hits the tube and is immediately pushed back by its curved surface. There is no tearing of the yarn or any other impairment of the withdrawal process.

Experiments with the method according to the invention have shown that in this way the empty tube can still be reliably ejected even when the yarn withdrawal speed is 1000 m per minute. It is pointed out that this effect can _{be used} advantageously not _only when there are two spools of thread on the mandrel. It is also advantageous in embodiments of the present invention in which there is only one yarn spool on each mandrel and in which the sleeve then has to pass through the rotating thread balloon of a mandrel arranged below it when it is replaced. In this case, too, the horizontal ejection of the empty tube is of considerable advantage.

As soon as the driver snaps back into the holding mandrel, the driver lever is simultaneously pushed up again by the action of the compression spring 57 and can thus be caught again by the coil when the next coil is pushed on. The holding mandrel also has a wire bracket 62, with which it is ensured that the sleeve lies in a predetermined position on the holding mandrel. The wire bracket is dimensioned such that the diameter of the holding mandrel plus the

Extent of the bracket in the vertical direction corresponds approximately to the inner diameter of the sleeve of the yarn spool.

At its end facing away from the support device, the holding mandrel has a hardened end pin 63. This end pin 63 is cylindrical and has a flattened portion 64 at its end in order to prevent rotation of the holding mandrel in the manipulation mandrel. A chamfer 65 at the end of the cylindrical end pin 63 facilitates the pushing on of the manipulation mandrel. A screw-in 66 in the end region of the holding mandrel serves to engage the lever 46 of the mandrel holding device, whereby the holding mandrel is fixed in the mandrel holding device with respect to its longitudinal axis.

The further structure of the trigger device is described below with reference to the figures already mentioned and to Figures 10 and 11. The handling device according to the invention can be constructed in many different ways. In the present case, it consists of a frame made of square aluminum tubes, which ensure that the handling device is lightweight. Instead of a scaffold frame, a self-supporting housing can of course also be provided. As will be described later, the handling device can be moved parallel to the supporting frame 2. Furthermore, it can be moved on the mast 12 in the height direction.

Regarding terminology, it should be noted that handling devices are mentioned when the function of carrying a thread spool and the holding mandrel is mentioned. If the handling device is combined with yarn finders and the like, the entire device is referred to as a bobbin changing device. In the present case, the handling device has a manipulation mandrel 70 which essentially has a circular cross section and whose outer diameter is such that it is smaller than the inner diameter of the sleeve of a yarn package. In the front part of the Manipulationsdo ns is a bore 71 concentric to the mandrel axis, which corresponds approximately to the diameter of the end pin 63 of the holding mandrel.

The manipulation mandrel is mounted for longitudinal movement on a carriage 72 and can be moved in its axial direction by a pneumatically operated cylinder 73. The mandrel is only held by the manipulation mandrel during the bobbin change. For this purpose, the handling device first moves into a position in which the holding mandrel and the manipulating mandrel have the same axial direction. The mandrel is held by the mandrel holding device at this time. The manipulation mandrel is then moved toward the holding mandrel and the end pin of the holding mandrel is inserted into the bore 71 of the manipulation mandrel. The tolerances of the end pin of the holding mandrel and the bore 71 of the manipulation dome are dimensioned such that the holding mandrel is held by the friction between the pin and the bore. A movement of the holding mandrel during the sliding on of the manipulation mandrel in the longitudinal direction is prevented by the fact that the mandrel holding device engages in the rotation of the holding mandrel, which is thus fixed in its longitudinal direction. Bending of the mandrel holding device, which would also lead to a movement in the longitudinal direction of the holding mandrel, is prevented by the upper U-shaped guide profile and the support rod.

It is pointed out that the bore must have a suitable depth in order to be able to absorb the corresponding surface pressure and the lever forces which are exerted by the receiving dome. It is also pointed out that it is expedient to use either the end pin of the holding mandrels or the surface of the bore of the manipulation mandrel or both a hardening process undergo, in particular, to increase the life of the device.

^& After the mandrel holding device has been removed from the holding mandrel, the holding mandrel is only carried by the manipulation mandrel. Tests have shown that the friction between the holding mandrel and the manipulating mandrel is sufficient to ensure that the holding mandrel is held securely. Should this positive connection for

If a particular application is not suitable or not advantageous, it is also possible to form-fit the connection between the holding mandrel and the manipulating mandrel. For this, e.g. B. the end pin of the holding mandrel has a circumferential groove into which a corresponding, pneumatically or electrically actuated

15 element can mature. It should be pointed out that care must of course be taken that such

Facilities must be accommodated in the manipulation mandrel itself, since the manipulation mandrel must be able to accommodate the yarn spool.

20th

The handling device also has a coupling pin 80 which engages in a corresponding bore 81 in the slide 43 of the mandrel holding device 41. In order to enable this engagement, this coupling bolt is connected to a cylinder 82 which moves the coupling bolt 25 in the direction of the support frame 2 and can be pulled away from it. The coupling pin is also connected to a cylinder 83, through which it laterally, i. H. can be moved in the horizontal direction parallel to the profile parts 20.

^τ > 30 When changing the bobbin, the coupling bolt 80 is first replaced by the

Actuation of the cylinder 82 of the Dornhalte- ^• "means inserted in the bore 81st The position of the bore 81 of the

The mandrel holding device also serves as a reference position and ensures that the manipulation mandrel is in the correct position ³ - relative to the holding mandrel. The manipulation mandrel is then moved towards the holding mandrel and takes its end pin 63 in the Hole 71 on. Now the cylinder 83 is actuated and the coupling pin pushes the mandrel holding device to the right as shown in FIG. 5, the mandrel holding device opening at the same time. The mandrel holding device is removed from the holding mandrel until the spool change is no longer hindered.

A sliding device 90 is further provided on the handling device, which has a sliding part 91 and a sliding plate 92. The sliding part 91 is connected to a pneumatically operated cylinder 93 and can be moved by this in the direction of the yarn spool picked up by the manipulation mandrel.

The embodiment of the invention shown in the drawing also has a device for collecting the thrown empty sleeves. For this purpose, a sleeve slide 94 is arranged under each mandrel, which has an inclined plane inclined towards the support frame, through which the sleeves are conveyed to the support frame. This inclined plane is also inclined to the transversely arranged profile part, which is located in the middle plane between two mandrels. As a result, the sleeve is conveyed both to the support frame and to the plane which lies in the middle between the planes in which the holding mandrels arranged one above the other are located. A sleeve shaft is arranged in this vertical central plane, through which the sleeves, which reach the sleeve shaft via the inclined plane, can fall down between the holding mandrels. Below the sleeve shaft, d. H. A conveyor, preferably a conveyor belt, is also provided below the bottom row of holding mandrels, through which the empty tubes are conveyed to a collecting container. This collection container can then be emptied regularly.

This sleeve collecting device also contributes significantly to the fact that the entire operation of the extraction device can be automated. One of the main problems which hindered the automation of the bobbin change in a continuously operated take-off device was the need to connect the end of the yarn of the first bobbin to the beginning of the yarn of the associated replacement bobbin. In order to achieve automatic operation, it is first necessary to reliably detect the start and end of the yarn. According to the invention, an automatic yarn finder is provided for this purpose, the structure and mode of operation of which are described below with reference to FIGS. 12a, 12b and 13.

The yarn finder 100 according to the invention has a base body 101, which can consist of steel, stainless steel, brass or also of a plastic such as polyamide. This base body has a main bore 102 which penetrates the entire length of the base body. In the lower part 102a of the bore is an injector nozzle

103 arranged opposite the bore 102a with a seal

104 is sealed. Above the seal 104, the injector nozzle has a smaller diameter than the bore 102a, so that a gap with an annular cross section is created. In the further part of the bore 102b, both the injector nozzle and the bore are tapered, the cone angle being different, so that a narrowing gap 102c is created. A bore 105 is embedded in the base body from the side and communicates with the bore 102. A connection 106 for a pneumatic hose 107 is screwed into this bore 105 in a sealing manner. Through this pneumatic hose 107, air is introduced into the bore 102, which flows through the annular gap and through the narrowing gap 102c. Provided in the interior of the injector nozzle 103 is a channel 108 which has a circular cross section and whose diameter corresponds to the diameter of the further part of the bore 102d. When compressed air flows through the pneumatic hose 107, a negative pressure is created in this channel 108, the pressure difference of which from the atmospheric pressure depends on the respective diameters of the bore and injector nozzle and on the pressure of the compressed air supplied. A further transverse bore 110 is arranged above the injector nozzle, in which a compressed air actuated piston 111 is guided. A pneumatic hose 112 is connected to the corresponding connector

Hole 110 connected. The piston 111 has a hemispherical shape purple on its front side. On the side of the bore 102 opposite the piston, a further bore 113 is arranged, which has the same axis as the bore 110. A pressure piece 115 is screwed into this bore by means of a screw 114, which has a shape that is complementary to the shape of the front of the purple part of the piston 111 is. If compressed air is now applied to the piston, it is pressed forward against this pressure piece 115.

A further bore 120 is provided above the bore 111, in which an optical sensor 121 is arranged. In the same axial direction as the bore 120, a bore 122 is arranged on the side opposite the bore 102, in which a reflecting element 124 is in turn held by means of a screw 123.

The optical sensor is designed in such a way that it can both emit light and also absorb light reflected by the reflector 124.

In an alternative embodiment of the thread gripper, the optical sensor 121 is designed in such a way that it only emits light, while the receiving element is thus arranged on the other side of the bore 102 in the bore 122.

In any case, the optical sensor is designed such that the amount of light received by the receiving element is reduced as soon as a piece of yarn is in the bore 102.

In the upper part 102d of the bore 102, a piece of pipe or a hose piece 125 is screwed, which guides the sucked-in yarn. The function of this yarn finder is now as follows: The yarn finder, as shown in FIG. 13, is guided over a spool 3 in a specific position. In order to determine the position of the yarn finder above the bobbin, an element is preferably arranged which mechanically, optically or electrically monitors the distance between the yarn finder and the bobbin, these values then being fed to a data processing unit which compares the distance reached with the predetermined target distance and if necessary ensures a change in distance between the yarn finder and the bobbin.

The yarn finder 100 is moved along a surface line of the bobbin 3 over the bobbin, in which case the bobbin is then subjected to a slow rotational movement. According to a preferred embodiment, the yarn finder also has a device with which compressed air is blown onto the spool.

A possibly stuck yarn start can be loosened in this way.

Particularly in the case of hairy yarns which frequently "stick" firmly to the spool, it may be expedient to use a brush device which presses on the spool of yarn as it rotates. As a result, the beginning of the yarn on the bobbin is also released from the bobbin.

As soon as the yarn finder comes close to the yarn start lying on the spool or whirled up by compressed air, this yarn start is sucked into the yarn finder by the negative pressure prevailing in the channel 108, penetrates the bore 102 and enters the tube or hose piece 125.

This reduces the amount of light picked up by the optical sensor 121. This event is registered by a data processing unit, which in turn controls the compressed air supply to the yarn finder in such a way that the compressed air connection 112 is supplied with compressed air, whereby the piston 111 is moved towards the pressure piece 115, and thereby the thread between the piston front side purple and pinched the pressure piece. The thread is now held in the yarn finder as long as the compressed air supply in the hose 112 continues.

The compressed air supply in the hose 107 can be interrupted. The yarn is then held in the gamfinder and can be moved with it.

According to an alternative embodiment, the piston 111 is not moved pneumatically, but electrically via a corresponding coil. A simple electrical connection is then provided instead of the compressed air connection 112.

Instead of the sensor 121, an electrical detection element can also be used, which can detect field changes in the area of the bore 102d.

Another execution ^'form of Garnfinders invention is shown in FIG. 12b. In this embodiment, the piece of hose 125 is replaced by a thread cutting device 130. The remaining parts of the yarn finder correspond to those of Fig. 12a. The yarn cutting device 130 has a channel 131 which runs in the axial direction of the channel 102 of the yarn finder. A bore 132 is arranged transversely to this channel 131, into which a connecting piece 133 is screwed, which is connected to a pneumatic hose 134. A piston 135 is arranged to be longitudinally movable in the bore 132, this piston having a knife edge 136 on its front side. A pin 137 prevents the piston in the bore 132 from rotating. An anvil element 138 is arranged opposite the piston and cooperates with the knife edge 136 in order to cut the yarn drawn into the bore 131. The anvil element 138 consists of a sleeve 139 which is rotatably mounted on a pin 140. As can be seen from the drawing, the knife edge 136 does not strike the sleeve 139 symmetrically. As a result, the

Cutting simultaneously a rotational movement of the sleeve 139 the pin 140, which prevents premature wear of the sleeve 139.

The use of such a thread cutting device has the advantage that all threads have the same length for further processing.

Although the yarn finder has been described above with reference to the take-off device according to the invention, it is self-evident for the person skilled in the art that such a yarn finder can also be used in other areas in which a yarn or thread start has to be found and detected.

The yarn finder must be moved to perform its job. This can e.g. B. happen with pneumatic cylinder-piston units, which enable the yarn finder to move in the respective direction of the piston stroke. The gamfinder can, however, also be moved with a gripper ram which can be moved about several axes, as is typical for handling machines.

Since the beginning and end of the thread usually have to be detected in a bobbin, two thread finders are usually used in the take-off device according to the invention. Since the yarn end is usually clamped in the area of the sleeve, a yarn finder is used in this area and thus finds the yarn end while the other yarn finder moves along the surface of the yarn spool and thus finds the start of the yarn.

It may happen that thread remnants are sucked in with the yarn finder described above, which pass through the bore 102 and are then ejected through the pipe or hose piece 125. In order to prevent an interruption in the yarn finding in this case, the yarn finder is preferably controlled in such a way that the clamping is only triggered when the optical signal has been checked in a specific time period. It has been found useful for. B. proved a time interval of 0.3 see. A pneumatically operating splicing device is provided for connecting the beginning of the second bobbin to the end of the first bobbin. This splicing device can also be arranged on the frame of the handling device.

A game clamp device is also provided on the support frame above each receiving dome, the structure and function of which is described with reference to FIGS. 14 to 17.

Fig. 14 shows a side view of the game clamp device 150, the upper part 151 serving to hold the yarn end, while the lower part 152 is used to hold the yarn while the new bobbin is being pushed open and in particular to determine whether the yarn starts and the end of the yarn are properly connected and whether the front spool has expired.

The function of the upper part 151 is best seen in FIG. 15. This upper part consists of a sheet metal part 153, which has a nose 154. A leaf spring 155 presses on this sheet metal part 153. A bore 156 is provided in the sheet metal part 153 and is closed by the leaf spring. In this bore the yarn end by means of the Garnfinders and its Garnhalte device is inserted, the leaf spring 155 is pushed back in the ^'insertion. The bore 156 is designed so that the thread is only loosely guided in this bore, which is essential for the function of this device.

The structure and function of the lower part 152 is best seen in FIGS. 16 and 17. The lower part consists of a sheet metal part 160, which is provided in its front part with an insertion opening 161. Arranged on the sheet metal part 160 are two rods 162, 163 which press the carriage 165 into the position shown in FIG. 16 by means of compression springs 164 (only one is shown in the drawing for reasons of clarity). To the

Carriage 165 has a holding projection 166. The function of this device is described with reference to the further FIGS. 18 and 19, which show how the connecting device and the clamping device work during the opening of a new coil.

18 shows the bobbin changing device 4 with the manipulation mandrel 70, the coil 3b being located on the manipulation mandrel. Furthermore, a first yarn finder 170 and a second yarn finder 172 as well as a pneumatically operating splicer 173 are shown in this illustration. The splicer has a suction hose 174. An empty sleeve 11a and a replacement coil 3a are located on the upper receiving dome 40c. Further coils 3c and 3d are shown schematically on the mandrel 40d.

In FIG. 18 it can be seen how the yarn end 180 of the bobbin 3b • is guided through the lower part 152 and the upper part 151 of the game clamping device 150. The yarn connection can be carried out before the manipulation mandrel is coupled to the receiving mandrel or after this coupling has taken place. The yarn connection takes place in that the splicer 173 connects the yarn start 181 and the yarn end 180 to one another. For this purpose, the yarn end 180 is sucked in in the area between the upper part 151 and the lower part 152, i. H. not the end of the thread itself

Splicer cuts both ends of the yarn to the same length and then spliced them together. The loose yarn ends are sucked off by a special hose so that the function of the take-off device cannot be impaired by yarn residues.

When the full bobbin 3b is pushed onto the holding mandrel 10c, the spliced yarn, guided through the special opening 161 in the sheet 160, is placed around the holding projection 166. This state can be seen in particular in FIG. 19, here the yarn end 180 of the bobbin 3a connected to the start of yarn 181 of the bobbin 3b and lies above the projection 165 of the game clamping device 150. At the same time, the end of the yarn 187 is added to the bobbin 3b by the second yarn finder 172 its forward movement inserted into the Ga clamp device. The yarn finder 172 then releases the yarn end 187, and the yarn end can then be sucked in again by the splicer during the next change process. The flipping of the yarn 180 and the yarn 181 causes the projection 166 to move in the direction away from the insertion opening in that the springs 164 are compressed as a result of the tensile force exerted on the yarn. This movement of the carriage 165 is recognized by a mechanical sensor, a so-called microswitch, which is not shown in FIGS. 14-17 and is reported to the data processing device. As a result, this device receives a signal that the splicing has been carried out and the coil has been pushed open. If the yarn has not been spliced properly, there is no tensile stress on the projection 166 and the microswitch is not actuated, in which case an alarm is triggered.

The Ga clamp device also has the function of recognizing when a coil has run out. This recognition occurs when the yarn jumps over from the front spool 3a to the rear spool 3b. As soon as the front spool has expired, the full pulling force of the trigger is exerted on the end 180 of the spool 3a. As a result, the carriage 165 moves backwards against the action of the spring 164. As soon as the slide and a stripping plate 167 come to lie one above the other, as shown in FIG. 17, the yarn is stripped from the elongated projection 166. The yarn is now released from the yarn clamping device and the yarn is now drawn off from the bobbin 3b. The snap-back of the slide 165 into its starting position or the end stop of the slide 165 is detected by a further microswitch which at the same time reports to the computer that the trigger has reversed from the front to the rear spool. The computer now saves the mandrel on which this changeover operation took place and then, after the other previous empty messages have been processed, initiates a corresponding bobbin change on this mandrel. It should be pointed out that other sensors are also conceivable with which the fact that a bobbin of thread can be emptied can be recorded. So z. B. optical sensors are used, which indicate whether the yarn end 181 of the bobbin is still at the appropriate point or not. However, the present device is simple and, as tests have shown, its function is very reliable.

The device which is provided in order to convey the bobbins from the bobbin storage magazine to the handling device is described with reference to FIGS. 4 and 20-22. FIG. 4 shows a conventional coil carriage on which individual coils 3 are arranged on several inclined planes 200. A pivotable stop 201 ensures that only one coil from the coil carriage reaches the positioning device. The positioning device 210 has two rollers 211, 212, which can hold a full spool of yarn. The two rollers 211, 212 simultaneously serve to rotate the bobbin to find the beginning and end of the yarn. Below the rollers 211, 212 there is a turntable 213 which serves to rotate the positioning device by 90, so that the axis of the spool of thread thereon is parallel to the axes of the holding mandrels.

The positioning device is movable along a frame 215 and can be adjusted in height by guide rods 216, 217 by means of a spindle. A toothed ring 220 is provided for the exact guidance of the positioning device along the frame 215. B. can be designed as involute toothing or as rack gear teeth. Depending on the type of ring gear, a rack or a corresponding element 221 is then provided, in which the ring gear 220 can engage. The function of the positioning device is now as follows:

The positioning device first moves to the first coil carriage or, if different coils are to be attached, the coil carriage on which the corresponding coil type is located. The stop 201 is released and the spool can roll onto the positioning device, which is moved into its lower position. The positioning device is then moved back into the position that can be seen on the left in FIG. 22. The spool is rotated by 90, as indicated schematically in FIG. 22. The coil is then raised. An optical sensor is provided, the light beam of which is emitted axially parallel to the axis of the sleeve of the coil. As soon as the bobbin is raised to an appropriate height, the emitted light is reflected by the yarn on the tube. This event is recorded by the data processing device. The spool of thread is then moved on until the light of the sensor finally falls through the opening of the spool of the spool, which then results in none

Reflection takes place more. In this position the stroke movement of the positioning device is stopped. It is now ensured that the opening of the sleeve is at a very specific height. The handling device moves to the position of the positioning device and can now pick up this coil with the manipulation mandrel.

In the embodiment described here, in addition to the manipulation mandrel, the first and second yarn finders and the splicer are also arranged on the movable handling device. The yarn finder and the splicer are each mounted or pivoted longitudinally via pneumatically operated cylinders and can be swung out to perform their function. This makes it possible to carry out the thread finding function while the bobbin is still on the positioning device and is carried and rotated by the rollers 211, 212. As soon as the yarn has been picked up by the two yarn finders, the handling device with the manipulation mandrel and the yarns held in the yarn holding devices can then move to the corresponding location of the pick-up mandrel.

The trigger device described above with reference to FIGS. 1 to 22 is characterized in that the entire operation thereof Trigger device can be carried out fully automatically. This was previously not possible in the prior art. Furthermore, the trigger device is characterized by a significantly reduced space requirement compared to conventional trigger devices. This is achieved in that in the pull-off device described, two spools of thread are each held by a holding mandrel. As a result, the number of mandrels and thus practically the space required for the extraction devices can be halved.

Claims

1zP claims

1. A method for operating a take-off device for yarn bobbins and in particular for operating a take-off device for yarn bobbins according to claim 22, in which the yarn bobbins consisting of a sleeve and a yarn wound thereon are carried by holding mandrels, the holding mandrels being held by dome holding devices on their the end areas facing away from the take-off side are held on one side, characterized in that the application of a full spool of thread to a receiving mandrel is carried out with a handling device which receives the full spool of thread, that the end of the holding mandrel which is adjacent to the mandrel holding device is connected to the handling device that the dome holding device of the holding mandrel is then removed from the holding mandrel, and that the full spool is then pushed onto the holding mandrel, with an empty sleeve possibly located on the holding mandrel over the free end of the holder hmedorns is dropped.

2. The method according to claim 1, characterized in that the picking up of the full bobbin is carried out with a manipulation mandrel which is pushed into the opening of the sleeve of the bobbin.

3. The method according to claim 2, characterized in that a manipulation mandrel is operatively assigned to a plurality of mandrels, the manipulation mandrel being movable with the handling device.

4. The method according to claim 3, characterized in that the manipulation mandrel horizontally and vertically transverse to the axis direction of a plurality of mandrels arranged parallel to one another can be moved.

5. The method according to at least one of the preceding claims, characterized in that the connection between the receiving mandrel and the manipulation mandrel is positive.

6. The method according to at least one of claims 1-4, characterized in that the connection between the receiving mandrel and the manipulation mandrel is non-positively.

7. The method according to at least one of the preceding claims, characterized in that the empty sleeve is initially held in a horizontal position during the dropping and is then dropped from this position.

8. The method according to at least one of claims 1-7, characterized in that in each case at least a first and a second yarn spool are operatively assigned to one another such that the yarn is drawn off first from the first yarn spool and, after the first yarn spool has expired, on the passes over the second thread spool and vice versa, the operative assignment including that the thread end of the thread spool, from which the thread is being drawn off, is connected to the beginning of the thread of the assigned thread, which is being pulled off next.

9. The method according to claim 8, characterized in that the mutually assigned yarn packages are arranged one behind the other on the same mandrel.

10. The method according to claim 8 or 9, characterized in that the beginning and end of the yarn of the mutually assigned bobbins are automatically connected during the plugging process by a Garnverbindungsein¬ device.

11. The method according to claim 10, characterized in that the yarn connection is carried out as a splice.

12. The method according to at least one of the preceding claims, characterized in that the beginning of the yarn to be put on -i

Bobbin is recognized by an optically or mechanically acting yarn detection device.

13. The method according to at least one of the preceding claims, characterized in that the yarn end of a bobbin to be attached is detected by an optically or mechanically acting Garnerken¬ detection device.

14. The method according to claim 12 or 13, characterized in that the detected yarn start or the detected yarn end is detected with a yarn-holding device.

15. The method according to at least one of claims 8 - 14, characterized in that the yarn end of the attached bobbin is inserted into a yarn clamping device associated with the respective mandrel when it is attached.

16. The method according to at least one of the preceding claims, characterized in that the take-off device is controlled by one or more data processing units, said data processing unit or units having storage devices in which is stored on which mandrels a coil is to be plugged.

17. The method according to claim 16, characterized in that the

Handling device with the manipulation mandrel first picks up one or more bobbins from a bobbin storage magazine, that it then travels to a first arbor on which a bobbin is to be attached and so on and that it then moves back to the bobbin storage magazine in order to take up one or more additional bobbins.

18. The method according to at least one of claims 8-17, characterized by the following procedure:

a) Detecting the start of yarn of a full bobbin

b) Detecting the end of the yarn of a full bobbin

c) holding the beginning of the yarn in a first yarn-holding device d) Holding the yarn end in a second 1 yarn holding device

e) Connection of the beginning of the thread of the full bobbin with the end of the thread of a bobbin previously placed on the same or a different take-up medorn

f) clamping the yarn end of the full bobbin in a yarn clamping device assigned to the holding mandrel

19. The method according to at least one of claims 1 to 17, characterized by the following procedure:

a) Starting a coil supply magazine with the handling device

b) Picking up at least one full spool with the manipulation mandrel

c) Approaching the holding mandrel onto which the first coil of the manipulating mandrel is to be attached.

d) connecting the manipulation mandrel and the mandrel,

20 e) removing the mandrel holding device from the holding mandrel

the following further steps being carried out during or after these process steps:

25 f) Detection of the beginning of the yarn of the full bobbin

g) Detecting the end of the yarn of the full bobbin

h) holding the beginning of the yarn in a first yarn holder * 30 device

_j ) holding the yarn end in a second yarn holder

35 and the following further method steps are then carried out: k) Connection of the beginning of the yarn of the full bobbin with the end of the yarn of a previously attached bobbin

1) Clamping the yarn end of the full bobbin in a yarn clamping device assigned to the holding mandrel.

and the following further steps are carried out after the attachment process

m) moving the dome holding device back to the holding mandrel

n) Loosen the manipulation mandrel from the holding mandrel

o) Approaching the coil magazine or, if there is still a coil on the manipulation dome, the next pick-up mandrel with the manipulation mandrel.

20. The method according to at least one of claims 12 - 19, characterized in that the bobbin is rotated during the detection of the beginning or end of the yarn.

21. The method according to at least one of claims 12 - 20, characterized in that a bobbin, the beginning or end of the yarn of which is not recognized during a predetermined period of time, is deposited by the manipulation mandrel at a predetermined location or is not received by the manipulation mandrel .

22. take-off device for bobbins and in particular for carrying out the method according to claim 1, with a support frame and one or more mandrels, which are arranged essentially side by side and / or one above the other, these mandrels in dome holding devices which are connected to the support frame are held on one side and take up from a sleeve and a thread wound yarn spools from which the yarn is drawn off, characterized in that the mandrel holding device of each mandrel can be moved away from this. ~ that one or more handling devices are provided with which one or more full spools of thread can be handled, that one or more coupling devices are provided for connecting a holding mandrel to a handling device, and that these coupling devices and these handling devices are designed in this way that the holding mandrel is held by the handling device after the mandrel holding device has been moved away.

23. Trigger device according to claim 22, characterized in that the handling devices are movable with respect to the Aufnahmedor¬ ne.

24. Extraction device according to claim 23, characterized in that the handling device is movable in a plane which is perpendicular to the axial direction of the holding mandrels, the handling device making a movement in the x direction / d. H. executes in the horizontal direction and moves in the y direction, d. H. in the vertical direction.

25. Trigger device according to claim 23, characterized in that one or more data processing units are provided for controlling the trigger device, which at least control and / or regulate the movement of the handling devices.

26. Trigger device according to at least one of claims 23-25, characterized in that step pulse generator devices and step pulse counting devices are provided, by means of which the current position of the handling device is defined in relation to a fixed reference point.

27. Trigger device according to claim 26, characterized in that control sensors are provided which determine the position of the handling device and thus u. a. also check the function of the step pulse generators and the step pulse counting devices.

28. trigger device according to at least one of claims 22-27, characterized in that each handling device one Has manipulation mandrel that can accommodate one or more bobbins.

29. Extraction device according to at least one of claims 22-28, characterized in that the coupling device consists of a shaft journal which is arranged on the receiving mandrel or on the manipulation mandrel and from a bore which is respectively arranged on the other mandrel, the coupling is caused in such a way that the shaft journal is inserted into this bore.

30. trigger device according to claim 29, characterized in that the shaft journal and the bore have such a Formge¬ design that after coupling a rotation of the two mandrels against each other is prevented.

31 take-off device according to claim 28-30, characterized gekennzeich¬ net that a sliding device is provided with which a yarn spool can be pushed from the manipulation mandrel to the mandrel.

32. take-off device according to at least one of claims 22-31, characterized in that the holding mandrel is designed in such a way that the empty sleeve left by a previous spool of thread on the receiving mandrel when plugging in a full spool of thread in the direction in which the pull-off takes place, is pushed down from the arbor.

33. Trigger device according to claim 32, characterized in that a sleeve holding device is provided which initially holds the empty sleeve in a substantially horizontal position during the pushing off of the receiving dome, the

Sleeve holding device is designed so that your holding function can be completed within a very short period of time, so that the sleeve falls down from the above-mentioned horizontal position.

34. trigger device according to claim 32 or 33 characterized gekenn¬ characterized in that devices are provided to collect the dropped sleeves. Ha

35. Trigger device according to claim 34, characterized in that a device for collecting the sleeve is assigned to each mandrel.

36. Trigger device according to claim 34 or 35, characterized gekenn¬ characterized in that the means for collecting the sleeves are connected to slides through which the sleeves are guided to a sleeve collecting device.

37. Trigger device according to at least one of claims 33-36, characterized in that the sleeve holding device has an elongated body which is arranged within the receiving mandrel and which can be extended in the direction of the trigger from the receiving mandrel.

38. trigger device according to claim 37, characterized in that the elongated body is connected to a first spring which is stretched when the elongated body is extended from the receiving mandrel.

39. trigger device according to claim 38, characterized in that a pivotable Mitnehmerein¬ device is provided on the elongated body, which is designed so that the elongated body is carried when pushing out the sleeve, and that furthermore a locking device cooperating with the driver device is provided, which causes the driver device to be pivoted away as soon as the elongated body has been moved out of the holding mandrel by a predetermined distance, the elongated body then being accelerated back into the holding mandrel by means of the energy stored in the first spring.

40. take-off device according to at least one of claims 22-39, characterized in that a yarn connection device is provided in particular in order to achieve a continuous yarn take-off in order to connect the yarn end of a bobbin with the yarn start of a further yarn bobbin associated therewith.

41. extraction device according to at least one of claims 22-40, characterized in that the mandrels procure 5O are that at least two yarn packages can be picked up one after the other.

42. take-off device according to claim 40 and 41, characterized gekenn¬ characterized in that the mutually assigned spools are arranged on the same mandrel.

43. take-off device according to at least one of claims 40-42, characterized in that the yarn connection device is designed as a pneumatically operating yarn splicing device.

44. Take-off device according to claim 43, characterized in that the yarn splicing device has a suction tube for sucking in the yarn end to be spliced.

45. Take-off device according to at least one of claims 43-44, characterized in that the yarn splicing device is arranged on the handling device, and can be pivoted from it via a pivoting cylinder to the yarn end of the associated first yarn spool held in the region of the support frame.

46. take-off device according to at least one of claims 43-45, characterized in that a device for suctioning off the yarn residues formed during yarn splicing is provided.

._ take-off device according to at least one of claims 22-46, characterized in that at least one yarn finder is provided for recognizing the yarn end or the beginning of a yarn spool.

48. take-off device according to claim 47, characterized in that the yarn finder can be moved over the area of the yarn package, at the beginning or end of the yarn are to be expected.

49. take-off device according to claim 48, characterized in that a device is provided to rotate the yarn spool while searching for the beginning or end of the yarn.

50. take-off device according to at least one of claims 47-49, characterized in that a device is provided which blows the yarn spool with compressed air during the yarn search in order to whirl up the yarn start or the yarn end.

51. take-off device according to at least one of claims 47-49, characterized in that a brush is provided which executes a relative movement to the yarn package in order to detach the yarn end from the yarn package.

52. take-off device according to at least one of claims 47-51, characterized in that the yarn finder has an area in which there is a negative pressure relative to the atmospheric pressure, through which the yarn end or the yarn start are sucked in.

53. Draw-off device according to claim 52, characterized in that the area in which there is negative pressure is formed as a channel starting from a surface of the yarn finder facing the yarn bobbin and into which the yarn start or the yarn end is sucked.

54. Trigger device according to at least one of claims 52-53, characterized in that the negative pressure is generated by compressed air which is fed to the yarn finder, the compressed air in the yarn finder flowing through a correspondingly designed nozzle.

55. trigger device according to claim 53 and 54, characterized gekenn¬ characterized in that the channel is arranged in the interior of this nozzle.

56. take-off device according to at least one of claims 47-55, characterized in that the yarn finder has a yarn detection device which triggers a signal when the yarn is picked up by the yarn finder.

57. Take-off device according to claim 56, characterized in that the yarn detection device has an optical sensor, preferably a light barrier. S- 2.

58. take-off device according to at least one of claims 53-57, characterized in that the optical sensor is arranged in relation to this channel in such a way that it detects the presence of a yarn in the channel.

59. Draw-off device according to at least one of claims 47-58, characterized in that the yarn finder has a yarn holding device.

60. trigger device according to claim 59 and at least one of claims 53-58, characterized in that the

The yarn holding device is arranged in relation to this channel in such a way that a yarn sucked into the channel is clamped thereby.

61. Trigger device according to claim 59 or 60, characterized gekenn¬ characterized in that the yarn holding device has an electrically or mechanically, preferably pneumatically movable piston.

62. AbzugVor icht device according to claim 61, characterized in that the piston of the yarn holding device cooperates with a pressure piece, the piston moving towards or away from this pressure piece and wherein the yarn is clamped between this piston and between this pressure piece.

63. take-off device according to at least one of claims 47-62, characterized in that the yarn finder is connected to a Garn¬ cutting device.

64. take-off device according to claim 63, characterized in that the yarn cutting device has a knife edge which is movable in a bore by a pneumatic piston.

65. Trigger device according to claim 64, characterized in that the knife edge is pressed onto an anvil element, wherein the anvil element preferably consists of a sleeve which is rotatably mounted on a pin, the knife edge not moving radially with respect to this sleeve. S3

66. Draw-off device according to at least one of claims 47-65, characterized in that each handling unit has two yarn finders, the first yarn finder being provided for searching for the beginning of the yarn and the second yarn finder for searching for the end of the yarn.

67. take-off device according to at least one of claims 47-66, characterized in that the yarn finder has a mechanically or optically or electrically acting sensor, 10 which outputs a signal which assigns the distance of the surface of the yarn finder facing the yarn spool to the surface of the yarn spool is.

68. trigger device according to claim 52 and at least one of claims 47-49 or 50-57, characterized in that the

15 distance of the effective area of the yarn finder to the surface of the yarn spool is between 1 and 10 mm, preferably between 3 and 7 mm, preferably about 5 mm.

69. take-off device according to at least one of claims 49-68, 20, characterized in that a device is provided by means of which the rotational movement of the bobbin is controlled so that the yarn end after the yarn recognition essentially at the highest point in the vertical direction of the sleeve lies.

"C 70. take-off device according to claim 69, characterized in that the device for controlling the rotational movement has a spring-loaded bracket which is moved by the yarn in a direction which is parallel to the direction between the yarn finder and the exit point of the yarn from the bobbin , and wherein on this bracket electrically acting sensors 0 are provided, with which the angular position of this bracket can be detected.

71. take-off device according to at least one of claims 47-70, characterized in that a deposit is provided on 5 the bobbins in which the beginning or end of the yarn are not recognized within a predetermined period of time. ry

72. take-off device according to at least one of claims 22-71, characterized in that a game clamping device is assigned to each mandrel, in which the yarn end of the rearmost yarn spool located on the mandrel is held.

73. Draw-off device according to claim 40 and claim 72, characterized in that the game clamping device further comprises a device for holding the connecting yarn from the first to the second yarn spool.

74. take-off device according to claim 73, characterized in that the device for feiting the connecting yarn has a movable, spring-loaded retaining projection over which the connecting yarn is guided, and that a sensor is also provided, preferably a microswitch, which outputs a signal as soon as the Holding projection is subjected to a yarn tensile force by the connecting yarn piece.

75. Take-off device according to claim 74, characterized in that the device for holding the connecting yarn further comprises a stripper, which takes effect when the holding projection reaches its end position, and which rejects the yarn from the ifelte projection, further comprising a sensor, preferably a microswitch which emits a signal when the stripping position is reached.

76. take-off device according to at least one of claims 22-75, characterized in that one or more Magazineinrich¬ lines are provided in which bobbins of the same or different sizes are arranged.

77. Take-off device according to claim 76, characterized in that a positioning device is provided which brings the yarn packages from the magazine devices into a predetermined position for reception by the handling device.

78. take-off device according to claim 77, characterized in that the positioning device comprises a lifting device with which a bobbin can be raised. T

79. take-off device according to claim 78, characterized in that an optical or electrical or mechanical sensor is provided which outputs a signal for stopping the Hubein¬ direction when the sleeve of the bobbin has reached a predetermined height.

80. take-off device according to at least one of claims 77-79, characterized in that the positioning device has a device with which the yarn packages can be rotated about a vertical axis which is perpendicular to the yarn package longitudinal axis, the angle of rotation preferably being greater than 0 and is not greater than 270 degrees.

81. Trigger device according to claim 80, characterized in that the angle of rotation is 90 degrees.

82. Take-off device according to claim 49 and at least one of claims 77-81, characterized in that the device for rotating the yarn spool about its longitudinal axis is connected to this positioning device during yarn finding.

83. Draw-off device according to claim 82, characterized in that the device for rotating the yarn spool about its longitudinal axis has two mutually parallel, rotatable rollers, the spacing of which is smaller than the diameter of the yarn spool, at least one of these rollers being connected to a drive device is.

84. Trigger device according to at least one of claims 77-83, characterized in that the positioning device can be moved horizontally.

85. take-off device according to at least one of claims 22-84, characterized in that the handling device and / or the yarn connecting device and / or one or two yarn finders are combined to form a yarn package changing device.

86. take-off device according to claim 23 and 85, characterized gekenn¬ characterized in that the spool change device is arranged to be mobile. 1

87. Trigger device according to claim 86, characterized in that in a longitudinal direction and optionally also in the

Height direction of the support frame a plurality of mandrels are arranged parallel to each other and that the yarn package change device 5 is movable in this longitudinal direction along the support frame.

88. take-off device according to claim 86 or 87, characterized gekenn¬ characterized in that the spool change device is carried by a movable in 0 longitudinal direction along the support frame mast, and that the spool change device is movable in the vertical direction along this mast.

89. trigger device according to at least one of claims 22-88, characterized in that a guide rod and a guide profile are provided on the support frame, in which the mandrel holding device is slidably mounted.

90. Trigger device according to claim 89, characterized in that the mandrel holding device has a slide which can slide along the guide rod in the horizontal direction, and that a vertical support rod is arranged on this slide, which in the horizontally lying guide profile intervenes.

25 9i. Extraction device according to claim 90, characterized in that an upper holding element and a lower holding element are fastened to the supporting rod in order to receive a cylindrical part of the holding mandrel.

0 92. Trigger device according to claim 91, characterized in that a lever is arranged on the lower holding element, which is mounted on an axis, wherein a spring engages on this lever, which is arranged at an angle to this lever that the lever in is held in a closed position,

-r when the mandrel holding device carries the holding mandrel and that the lever is held in an open position by the spring when the mandrel holding device is moved away from the holding mandrel.

93. Trigger device according to at least one of claims 22-92, characterized in that it has the following mechanically and / or optically and / or electrically acting sensors:

a) a sensor that detects that a spool of thread on a mandrel has expired; and or

b) a sensor which detects whether a thread spool is present in the magazine device; and or

c) a sensor which detects whether a yarn package is present on the positioning device; and or

d) a sensor which detects whether a yarn spool is accommodated on the manipulation mandrel; and or

e) a sensor which detects that the position of the corresponding mandrel has been correctly approached by the handling device; and or

f) a sensor which detects that the yarn connection has been carried out correctly; and or

g) a sensor which detects that the start of the yarn spool has been found by a first yarn finder and / or

h) a sensor which detects that the yarn end of a yarn package has been correctly picked up by a second yarn finder, and / or

i) a sensor which detects that the yarn spool is in such a position that the yarn end is on the sleeve at the top and / or

k) a sensor which detects that the yarn connection was carried out correctly and / or

1) a sensor which detects that the mandrel holding device is removed from the holding mandrel and / or 1 m) a sensor which detects that the yarn end of the bobbin to be plugged in has been correctly inserted into the game clamping device and / or

n) a sensor which detects that the yarn end of the previous bobbin located in the yarn clamping device is correctly picked up and / or

o) a sensor which recognizes that the deposit for the spooling out of yarn packages in which the beginning and / or end of yarn 10 has not been recognized in a predetermined manner is filled.

94. trigger device according to at least one of claims 22-93, characterized in that a central, program-controlled data processing device is provided which the

., - Receives signals from the sensors and which controls the entire trigger device.

95. trigger device according to claim 94, characterized in that the program stored in the data processing device, the trigger device according to the method steps

20 controls according to at least one of claims 1-21.

96. Trigger device according to at least one of claims 22-95, characterized in that the trigger device has an acoustic and / or an optical signal device which is put into operation by the central or by a decentralized data processing unit if one of the Sensors indicates that the trigger device malfunctioned.

30

35