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Publication numberUS3810352 A
Publication typeGrant
Publication dateMay 14, 1974
Filing dateFeb 18, 1970
Priority dateFeb 25, 1969
Also published asDE2008142A1, DE2008142B2, DE2008142C3
Publication numberUS 3810352 A, US 3810352A, US-A-3810352, US3810352 A, US3810352A
InventorsKariya S, Miyazaki T
Original AssigneeToyoda Automatic Loom Works
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Automatic yarn piecing apparatus for a continuous ringless spinning machine and method of using same
US 3810352 A
Abstract
The present invention relates to the continuous ringless spinning machine for carrying out the piecing of supplied fiber and yarn end in a rotary spinning chamber, wherein a yarn piecing machine running along the spinning unit of the spinning machine stops in front of the detected spinning unit involved in yarn breakage. The yarn end of the package is caught and drawn by means of suction to guide the yarn end above the spinning unit involved in yarn breakage. At the same time the yarn is cut off leaving a predetermined length of said yarn, and the broken yarn end is introduced into the spinning unit involved in yarn breakage to have the same turned into the spinning chamber. Thereafter said yarn is continuously withdrawn from the spinning chamber to automatically carry out the piecing operation of the finished yarn.
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Description  (OCR text may contain errors)

United States Patent 11 1 Miyazaki. et al.

MACHINE AND METHOD OF USING SAME Inventors: Tsutomu Miyazaki; Suzuki Kariya,

both'of Yoshihisa, Nagoya, Japan Kabushiki Kaisha Toyoda 1 Jidoshokki Seisakusho, Kariya, Japan Filed: Feb. 18, 1970 Appl. No.: 12,308

[73] Assignee:

Foreign Application Priority Data Feb. 25, 1969 Japan 44-14405 Mar. l5, I969 Japan 44-19695 US. Cl. 57/34 R, 57/56, 57/5s.'95,

57/156 1111.01 D01h 15/00 Field of Search 57/56, 156, 58.8958.95,

References Cited UNITED STATES PATENTS Elias et al. 57/58.95

[451 May 14, 1974 3,411,281 11/1968 Guido et al. 57/34 R 3,546,870 12/1970 Schewe et al. 57/34 R 3,597,911 8/1971 Schiltknecht 5758.89 X 3,503,198 3/1970 Goldammer et al. 57/53 Primary Examiner-John Petrakes [57] ABSTRACT The present invention relates to the continuous ringless spinning machine for carrying out the piecing of supplied fiber and yarn end in a rotary spinning chamber, wherein a yarn piecing machine running along the spinning unit of the spinning machine stops in front of the detected spinning unit involved in yarn breakage. The yarn end of the package is caught and drawn by means of suction to guide the yarn end above the spin ning unit involved in yarn breakage. At the same time the yarn is cut off leaving a predetermined length of said yarn, and the broken yarn end is introduced into the spinning unit involved in yarn breakage to have the same turned into the spinning chamber. Thereafter said yarn is continuously withdrawn from the spinning chamber to automatically carry out the piecing operation of the finished yarn.

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- sum 11ur11 Fig /8 1 AUTOMATIC YARN PIECING APPARATUS FOR A CONTINUOUS RINGLESS SPINNING MACHINE AND METHOD OF USING SAME nected to the package to be taken up. When the socalled continuous ringless spinning machine is employed, the spinning process can be simplified, and the productivity can be remarkably improved.

In a spinning factory, where the above mentioned continuous ringless spinning machine is employed, the use of an automatic yarn ending machine is required.

In the above mentioned continuous ringless spinning machine, when yarn breakage is detected and there is no automatic yarn ending machine in use, an operator draws out the end portion of the-yarn by an optional length after having stopped the rotation of the package. Then the yarn is introduced into the spinning unit by hand. The piecing of. the yarn end and the supplied fiber is judged by the experience of the operator, and the yarn is taken up at an appropriate time. Therefore an accurate yarn piecing operation cannot be expected. In particular, in accordance with the conventional method, the yarn piecing is verydifficult to achieve because the timing for taking yarn out from the spinning unit involved in yarn breakage and the speed for taking the yarn out from the spinning unit directly causes repeated yarn breakage.

In addition, the appearance of the yarn at the yarn piecing portion is not always the same. Sometimes it is formed into a large knot.

It takes a long time for an operator to carry out the yarn piecing operation, and labor costs become excessive, efficiency of the spinning machine is lowered, and the qualityof the yarn is reduced.

Thus, an automatic yarn piecing operation is needed.

An object of the present invention is to automate the yarn piecing operation of the continuous ringless spinning machine and thereby minimize the labor required. In accordance with the present invention, the yarn piecing operation of a great number of spinning units can be quickly carried out, and the length of time stopped of the spinning unit involved in yarn breakage can be shortened as much as possible to remarkably improve the productivity of the machines of this kind.

Other objects of'the present invention are to prevent the generation of knots while carrying out an accurate yarn piecing operation, to carry out the spinning of excellent quality yarn, to improve the quality of the yarn produced by catching the broken yarn end by means of suction effect, withdrawing a predetermined length of yarnand providing mechanical means for adjusting the length of the yarn introduced into the spinning chamber and the take-up time.

Another object of the present invention is to suck the remaining fiber present in the rotary spinning chamber so that in the following yarn piecing operation, the yarn end introduced into the spinning chamber can accurately wind the supplied fiber, and the yarn piecing operation can be smoothly carried out, and at thesame time the knot portion of the yarn ending can be eliminated.

Another object of the present invention is to stop the automatic yarn piecing machine correctly at the position where the spinning units involved in yarn breakage and the portion of yarn piecing operation coincide wherein the automatic yarn piecing machine runs along the spinning machine in a predetermined path. Since the automatic yarn piecing machine runs very quickly, it is convenient to detect yarn breakage in the early stage. The coincidence of the spinning units involved in yarn breakage and the portion of yarn piecing operation is carried out conveniently by running the yarn piecing machine with a low speed drive or by inertia as soon as the yarn breakage has been detected.

The present invention relates to the method and the apparatus for automatically carrying out yarn piecing operation by means of an'automatic yarn piecing machine capable of stopping at a predetermined position by detecting a spinning unit involved in yarn breakage.

Another object of the present invention is to correctly catch the yarn end of the package by means of a suction force at a predetermined position, so that a predetermined length of yarn end can be introduced into the rotary spinning chamber smoothly along with the suction stream generated in the discharge passage of the spinning unit involved in yarn breakage to carry out the piecing thereof to the supplied fiber, thereafter the yarn being continuously taken out.

In the drawing:

FIG. I is a front elevational view of an entire spinning machine including an automatic-yarn piecing machine comprising this invention; I

' FIG. 2 is a cross sectional side elevational view showing how --the automatic yarn piecing machine is mounted on the rail of the spinning machine;

FIG. 3 is a partial cross sectional elevational view showing in somewhat greater detailthan FIG. 2 atypical spinning unit of the spinning machine;

FIG. 4 is a side elevational view showing the relation between the yarn piecing portion and the spinning machine;

FIG. 5 is a partial cross sectional side elevational view showing structure for cleaning the rotary spinning chamber by means for removing the remaining fiber in the automatic yarn piecing machine;

FIG. 6 is a cross sectional view showing the relation between the suction tube for cleaningand the rotary spinning chamber;

FIG. 7 is a cross sectional side elevational view showing another embodiment of the means for removing the remaining fiber;

FIG. 8 is a side elevational view similar to FIG. 4 showing structure for the operation of the yarn piecing portion;

FIG. 9 and FIG. 10 are cross sectional elevational views showing the driving mechanism of the electromagnetic clutch provided on the main portion of the automatic yarn piecing machine;

FIG. 11 is a fragmentary view of the yarn end discharging nozzle;

FIG. 12 is a cross sectional plan view showing the relation between the yarn end discharging nozzle and the guide roller;

FIG. 13 is a plan of yarn guide cam cutter;

FIG. 14a is a cross sectional side elevational view of the yarn end carrying guide;

FIG. 14b is a cross sectional plan of the yarn end carrying guide;

FIG. is a front view showing the unoperated state of a stop instructing device of the automatic yarn piecing machine;

FIG. 16 is the front view showing the state in which stop instructing device of FIG. 15 is operated;

FIG. 17 is a circuit diagram of said stop instructing device shown in FIGS. 15 and 16; and

FIG. 18 is a circuit diagram of the main portion of the operation portion of the automatic yarn piecing machine.

As is shown in FIG. 3 in which a modification of a continuous ringless spinning machine 18 capable of utilizing the present invention is shown, the sliver-like fiber is fed by the feed-roller 1 to the combing roller 2 to thereby open up and separate the respective fibers. The separated fibers are introduced into the high speed rotary spinning chamber 4 which is internally under negative pressure by air-discharging hole 3. The separated fibers are attached on the collecting surface of the spinning chamber 4, and the end of the twisted yarn is connected to the package 6 which gradually takes up the attached fibers, and discharges them in finished form through the path 7 from the spinning chamber 4.

The discharged yarn passes through the take up roller I 8 and top take up roller 9 and is wound on the package 6 which is frictionally rotated by the take up drum 10.

the remaining yarn is naturally brought about by the breakage of yarn.

For that purpose, the first support casing 11 having feed roller 1 and combing roller 2, and the second support casing 12 having the spinning chamber 4 can be separated.

The two support casings 11 and 12 are coupled by the engagement of the clutches l3, 14 in the normally operating position shown in FIG. 3. The spinning chamber 4 is rotated by means ofa belt 15 and the combing roller 2 is rotated by means ofa belt 16. The feed roller 1 is rotated by means ofa shaft 19 through an electromagnetic clutch G which is actuated by a detector 17 for detecting yarn breakage of the yarn discharge path 7.

When the breakage in the yarn is detected, the yarn breakage detector 17 is operated to disengage the clutch G and the transmission of rotation to the feed roller 1 is interrupted to stop the supply offiber. At the same time, the lamp 20 of the yarn detector 17 is energized.

The automatic yarn piecing machine 21, as is shown in FIG. 2, is mounted on a rail 22 provided throughout the whole length of the upper portion of the spinning machine 18 through the rollers 23, 24, 25. The rack 26 formed on the rail 22 is connected to the motor 28 through the gears 27. Therefore the automatic yarn piecing machine 21 is driven along the rail 22 at a predetermined speed by the motor 28 during the operation of the spinning machine 18.

The supply of any suitable electricity from the spinning machine 18 to the yarn piecing machine 21, is provided by an electricity supplying device.

When the automatic yarn piecing machine 21 arrives at the front surface of the detector 17 Le, the spinning unit involved in yarn breakage, the detector 30 provided on the automatic yarn piecing machine 21 detects the light of the lamp 20, and stops the positive operation of the motor 28.

In other words, as is shown in FIG. 17, when the contact K of the detector 30 is closed, the point of contact of relay X connected to the electromagnetic switch MS, is placed in the of position, and the electromagnetic switch MS is released. Therefore the supply of electricity to the motor 28 is disconnected, and the automatic yarn piecing machine 21 enters into the inertial running state as the electricity supplied to the motor 28 is cut off.

The automatic yarn piecing machine 21 is required to stop at the position where the yarn piecing portion 31 coincides with the spinning unit'involved in yarn breakage.

Therefore the automatic yarn piecing machine 21 is provided with a stopping device composed of a detection lever 33 (FIG. 2) adapted to be engaged by a pin 32 attached to the side of the rail 22 in relation to the respective spinning units. Limit switch LS is capable of being contacted by the lever 33, and as is shown in FIG. 15, the limit switch LS is positioned out of the range of rotation of the lower end of the detection lever 33 to be rotated by the pin 32 when normal driving is carried out. However, the solenoid SOL is also energized along with the operation of said relay X and therefore the plunger 34 thereof pushes up said limit switch LS into the contacting range of the detection lever 33. Then, at a predetermined position of yarn breakage, that is to say, the position where unit 31 coincides with the spindle on which yarn breakage occurs, as is shown in FIG. 16, the limit switch LS energizes the electromagnetic brake B as it receives the effect of the detection lever 33.

The automatic yarn piecing machine 21 which is in I the inertia running stage can be accurately stopped easily by working the electromagnetic brake B on the motor shaft 35, which is the source of the driving thereof.

The detection of the spinning unit involved in yarn breakage by means of the automatic yarn piecing machine 21, is not carried out by the detection of the presence of yarn, but is carried out by the actuation of thedetector 17 of the spinning unit. Therefore the instruction to the automatic yarn piecing machine 21 can be accurately given.

However, the yarn piecing portion stops at the position coinciding with the spinning unit involved in yarn breakage after receiving light from the lamp 20. Therefore the detector 30 on the side of automatic yarn piecing machine 21 is required to be mounted on the side in which the automatic yarn piecing machine 21 is moved rather than yarn piecing portion 31.

Therefore, inertia running is carried out over the distance from the detector 30 to the central portion of the yarn piecing portion 31 from the time when the detecyarn piecing portion has stopped at a predetermined position, and the spinning of the yarn from the spinning unit is started. However, the limit switch LS for confirming the termination of yarn piecing is operated by an appropriate instruction of terminate the yarn piecing so as to again drive the automatic yarn piecing machine 21. f

Thereby the relay X is operated, and therefore the above mentioned relay X, is opened. When the energi- -zation of the electromagnetic brake B is released, the

electromagnetic switch MS is operated, to start the driving motor 28.

Thus, the automatic yarn ending machine 21 is disconnected from the spinning unit, having terminated the yarn ending, and is driven to detect the next spinning unit involvedin yarn breakage.

Of course, the solenoid SOL is de-energized by the opening of the relay X, so that it is possible to disconnect the limit switch LS, from the range of contact against the detection lever 33.

Thus, the spinning unit involved-in yarn ending discharges light,and the detector 30 for detecting the sameis provided on the running direction rather than on the yarn ending structure 31 in theautomatic yarn ending machine 21. After the operation of the detector 30, an inertia drive is provided and the stopping device is operated at the position where the yarn ending portion 31 and the spinning unit involved in yarn breakage coincide to perfectly stop the driving system of the automatic yarn ending machine. Therefore the stopping can be made smoothly and at an accurate position.

In the above given embodiment,,the driving'force of the running motor 28 is disconnected by detecting the spindle involved in yarn breakage with the detector 30 and 'it is shifted into inertia running, but it can be switched into low speed running when a low speed running mechanism is built into the running mechanism of the automatic yarn ending machine '21.

Namely, when a variable speed gear is provided on the side of the transmission of the running motor 28, said variable speed gear is operated by the operation of the detector 30 to have the automatic yarnending machine 21. running at low speed. Thereafter, the stopping device is operated at the position where the'yarn end- 7 ing portion 31 and the spindle involved in yarn breakage are matched to stop said automatic yarn ending machine accurately at a predetermined position.

The above mentioned embodiments shown in the drawing are of the types which can be operated only when the automatic yarn piecing machine 21 is driven in one direction. It is also possible to provide detectors 30 on both sides of the machine in such a manner that each of the detectors can be operated in relation to the running direction.

What must be described before the automatic yarn piecing machine is explained in detail, is that the feed roller 1 alone is stopped by yarn breakage. The spinning chamber 4, the combing roller 2, the discharge roller 8, and the take up drum l0 keep on revolving by inertia. 1

Therefore, when the feed roller 1 is stopped, there are fibers which remain attached to the collecting surface 5 in the spinning chamber 4. The fibers are not made into yarn by being introduced into the spinning chamber 4.

The initial operation of the automatic'yarn piecing machine 21, is the release of the front side of. the spinning chamber 4 for removing the remaining fiber. When the motor 36 is driven in the normal direction and the electromagnetic clutch A on the main shaft 37 is engaged, the arm 38 drives the mechanism for operating and closing the support casings 11 and 12. That is, the gear 42 is rotated on the shaft 41 through the connection of the chain 39 and. the sprocket 40, and therefore the sector gear 43 engaged thereagainst is rotated round the shaft 44. The arm 38 supported on the guide rail 45 that is coupled to the sector gear 43 is lowered to be rotated.

With regard to the arm 38, the end' of said arm 38 pushes the release pin 46 at the upper end of the body 11 to release the connection of latches 13, 14, and in this state the electromagnetic clutch H, provided on 'said shaft 41, is disengaged from the gear 42 to stop said arm 38. See FIG. 9.

, Thereafter, said electromagnetic clutch H is engaged in the gear 47 on the same shaft 41 to transmit the rotation.

The gear 47 transmits the rotation to the pinion 48 on said shaft 44, and the pinion 48 is secured to the arm 38 and engaged in the rack 49. Therefore the arm 38 carries out the backward driving, and the support casing 11, separated from the second support casing 12, is received by the receiving portion 50 formed on the end thereof, and it is gradually tilted with the shaft 19 as the fulcrum.

The front side of the spinning chamber 4 is opened by the above mentionedoperations, and then the remaining fiber removingv device is operated. In order to accurately carry out the operation of said'device, the support casing 12, tilted by the hook member 51 of support casing 11, is prevented from tilting before it contacts the brake 53 after the pulley 52 used for driving the spinning chamber 4 has been separated from the driving belt 15 so that the spinning chamber-4 can keep on the inertia rotation.

The above mentioned clutch A is released when the above mentioned state is satisfied.

Revolution-is transmitted to the pinion 56 to be engaged by the rack 55 that is provided on the nozzle 54 in order to move nozzle 54 forward for cleaning the remaining fiber.

In this case, an electromagnetic clutch C is provided on the shaft 57. After the termination of the retreat of the arm'38 the nozzle 54 starts the lowering'movement as clutch C is instructed, and when the end thereof has entered into the spinning chamber 4, the motor 36 stops.

The cleaning nozzle 54 has dual functions as is apparent from FIG. 5 and FIG. 6'. In the center of the cleaning nozzle the suction tube 58'is provided to carry out the air sucking operation within spinning chamber 4. Compressed air is introduced between said tube 58 and the surrounding tube 59, and the compressed air is jetted against the collecting surface 5 of the spinning chamber 4, from the air jetting hole 60.

As mentioned before, the spinning chamber 4 is rotated by inertia, and therefore, when the outlet of the air jetting hole 60 faces in the direction of revolution of the spinning chamber 4, the jetted air stream works in such a manner that the revolution of the remaining fiber attached on the collecting surface 5 can be prevented. The remaining fiber can be easily separated from the collecting surface 5, and the separated fiber can be accurately subjected to suction treatment by means of the sucking effect of the tube 58.

As is shown in FIG. 7 for another embodiment, the peeling member 61, is provided on the suction tube 58, to hook and suck the remaining fiber.

As mentioned above, the cleaning of the spinning chamber 4 is terminated and then the cleaning nozzle 54 is moved forward. After a predetermined period of time, the motor 36 is driven in the opposite direction and therefore, the cleaning nozzle 54 is raised and retracted through the electromagnetic clutch C. When the cleaning nozzle 54 is restored into the original position, the clutch C is disengaged.

The arm driving mechanism 38 is operated to restore the spinning chamber 4, after the termination of the cleaning, into the normally operating state. That is to say, when the extreme terminal of arm 38 supports the first support casing 11 and the front of the spinning chamber 4 is open, then the electromagnetic clutch H is in contact with the side surface of gear 47. At time of contact, the reverse rotation of motor 36 is transmitted to pinion 48 through electromagnetic clutch H, chain 39, sprocket 40, shaft 41 clutch H, gear 47 and shaft 44 to provide arm 38 with a forward motion, causing thus casing 11 to contact casing 12. Upon successful contact of casings 11 and 12, clutch H switches over to contact the side surface of gear 42, rotating the guide rail 45 with the fulcrum of shaft 44 to elevate arm 38 upwardly by means of sector gear 43.

ln this case, the pressure of the release pin 46 is released at the end of the arm 38, and the clutches 13, 14 are again engaged. The engagement of the two support casings 11 and 12 becomes more accurate.

When the arm 38 is turned back to the originalposition, the electromagnetic clutch A is released, and all the cleaning operations are terminated in spinning chamber 4.

As a matter of course, positive rotation is transmitted again to the combing roller 2 and the spinning chamber 4, and a strong sucking stream is-generated in the discharge path 7.

Next, the yarn piecing operation is started. It is then necessary to catch the yarn end caused by yarn breakage.

The yarn end is attached'on the periphery of the package 6 by the continuous revolution of the package 6. In accordance with this invention, the yarn end is sucked and caught by creating suction air around the package 6.

In particular, the yarn end wound on package 6 is drawn out as basic yarn," into the yarn discharge path 7. Therefore the lever 63'is pushed up'by the rotation of the push up lever 95 by means of the energization of the solenoid 62, and it is taken up on the package 6. After having been separated from the drum 10, the rewinding roller 65 is moved forward to the side of the package 6, and then the above mentioned solenoid 62 is deenergized and the push up lever 95 is lowered. The

package 6 is then pressed against the rewinding roller 65.

The motor 36 is switched in the normal direction and at the same time the electromagnetic clutch D provided on the main shaft 37 is engaged. Therefore the rotation of the cam 66 is carried out, and the discharge nozzle 64 having the roller 67 mounted thereon is rotated below the package 6 with the shaft 68 as the fulcrum. When the roller 67 is contacted against the portion of the maximum diameter of the cam 66, the above mentioned clutch D is disengaged.

A number of operation members are provided on the discharge nozzle 64. The rewinding roller 65 to receive the package 6 is at the upper most end of the discharge nozzle 64.

Thus, the electromagnetic clutch E on shaft 69 is engaged against the motor simultaneously when the motor 36 is started. The rotation in the rewinding direction can be transmitted to the package 6 by the above mentioned rewinding roller 65 bearing against the package 6.

The guide roller 70 for accurately holding the yarn end caught with the discharge nozzle 64 is provided on the bracket 71 of the discharge nozzle 64.

In order to remove the drawn yarn at the spinning speed of the spinning machine, press-roller 72 of the automatic yarn piecing machine 2 is pressed against take up roller 8 on the side of the spinning machine 18 by means of part 73 of the above mentioned bracket 71.

However, the revolution to be transmitted from the take up roller 8 onto the press-roller 72, is meaningless while yarn end is rewound from the package 6. The electromagnetic clutch E, provided on the shaft 69 in the chain driving mechanism, is disconnected to disconnect the relation to the rewinding roller 65.

The take up nozzle 64 is in such a form as is extended in the lengthwise direction of the shaft of the package 6 and along the periphery of the package 6. Therefore the yarn end can be easily sucked to be rewound along with the operation of the rewinding roller 65. As shown in FIG. 11, the take up nozzle 64 is extended in a longitudinal direction along the peripheral surface of package 6 so as to be suitable for the catching yarn end. Accordingly, it is possible to suck and rewind the yarn end easily according to the operation of rewinding roller 65.

When the end of the yarn sucked into the nozzle 64 arrives at the bent portion 74, it comes out of the slit 75 provided in the center of the nozzle 64 because of the tension generated at the yarn end. The yarn travels in a straight line between the take up drum 10 and the stopper 76 at the above mentioned bent portion 74. Reference may be had to the relative positions shown in FIG. 8.

in such a state as above, the electromagnetic clutch F, provided on the main shaft 37, is engaged against the lever 77, and therefore the rotation in the normal direction from the motor 36 is transmitted. The yarn guide cam cutter 78, connected to the lever 77, is moved forward, and the yarn end at Position 1 is, guided as far as Position ll while pushing the yarn end with the guide portion 79.

As is shown in FIG. 13, the yarn guide cam cutter 78 I is provided with the V-shaped guide portion 79 at the end thereof. The fixed edge 86 is provided on one seetion of said V-shape in such a manner that the rotary edge 85 can be rotated along the other section.

The above mentioned yarn guide cam cutter 78 is positioned in the path of the yarn moving from the above mentioned slit 75 to Position I. Therefore the yarn is introduced into the surface 96 formed by the slanted surface and arrives at the guide portion 79.

Along with the above described effect, as is shown in FIG. 12, the yarn end is guided to the position for holding a pair of guide rollers 70 biased by the spring 80.

The yarn coming from the inlet portion 81 passes through the path 82, and enters the portion 83 formed by the slanted surface of end portion of the guide roller 70 to carry the same as far as the holding point. The neighboring side to said inlet portion of said guide roller 70 is formed in a tapered shape.

Of course, said guide roller 70 is shaped so that the "revolution of the motor 36 can be transmitted to the guide roller 70 in such a manner that the held yarn end is rewound by such driving mechanisms as gearing or chain means and can be taken out synchronously with the rewinding roller 65. v

When the cutter 78 is moved forward above the discharge path 7 of the unit 11, the clutch F is discon-' nected to stop the cutter 7 8, and'at the same time the solenoid 84 on the cutter 78 as is shown in FIG. 13 in energized. The rotary edge 85 is rotated, and therefore the yarn end-positioned on the guide portion 79 is cut off between the guide portion 79 and the fixed edge 86.

The timer is operated simultaneously with said opera- Therefore the rewinding position of the yarn end rewound from package 6 is always made constant regard less of the diameter of-thepackage 6. Therefore, the interval between-the yarn and rewinding position and yarn end cutting position is always made constant.

After having cut off the yarn end, the time when the end of the yarn passes through the discharge path 7 and arrives at the collecting surface 5 of the Spinning chamber 4 can be easily determined when the rewinding speed of the guide roller 70 is taken into consideration.

In addition, the sucking effect of the nozzle 64 is stopped to prevent the yarn end from being affected at the same time when yarn is cut off.

The yarn end involved in breakage should be introduced into discharge path 7 as so-called basic yarn, as stated before.

Conveniently, there exists in the discharge path 7 an air stream flowing from outside due to negative pressure within thespinning chamber'4. Therefore, the yarn end which has fallen in the neighborhood of the entrance of the discharge path 7 is easily introduced into the path 7. Of course, it is possible to produce a special sucking stream. In case of introducing a yarn end, generation of snarl or shrinkage of the yarn end due to a twist of the yarn at the time of breakage should be considered.

When a snarlis generated, the introduction of the yarn end into the discharge path 7 is impossible. However, in accordance with this invention, the guide roller 70 is provided, and said guide roller 70 is close to the cutter 78. Therefore after having cut off the yarn, the short yarn end connected to the guide roller can release the twisting and a snarl cannot be generated. The yarn can become almost straight.

In order to more accurately carry out the introduction 'of the yarn end into the path 7, the carrier guide 87, as is shown in FIGS. 14a and 14b, is positioned between the cutter 78 and the inlet of the path 7, andone or several air streams are generated from the above nozzle 88, to guide the yarn end.

In this case, the yarn end is carried by the air stream and therefore a snarl cannot be generated.

On the other hand, when the above mentioned timer which has .started the operation as soon as the yarn end is cut off is brought to time up, that is, when the yarn end as basic yarn has arrived at the collecting surface 5 of the spinning chamber 4, strong tension is generated by the centrifugal force caused by the rotation of the'spinning chamber 4. The detector 17 for detecting yarn cut is then operated, and the electromagnetic clutch G is engaged again to carry out the driving of feed roller I.

Fiber is supplied into the spinning chamber 4 by the above mentioned operation, and it is connected to the basic yarn at the collecting surface 5 in the spinning chamber so that the yarn .piecing may be carried out.

the rotation speed of the respective rotary portions of the yarn piecing machine 21, is always constant. Therefore in carrying out the drawing out of the yarn, the guide roller 70 of the yarn ending machine 21 or the rewinding roller 65 are synchronized with the rotation or spinning speed of the spinning machine.

Therefore in accordance with the present invention, the press-roller 72 is arranged to contact and drive the discharge roller 8 when the discharge nozzle 64 is moved forward.

However, the electromagnetic clutch E provided on the shaft 69 of the chain driving mechanism is disconnected from the motor 36,-and it is switched so that the clutch E is engaged against the driving mechanism from the press-roller 72. For that purpose, the revolution of the press-roller 72 transmitted from the discharge roller 8 is transmitted as the normal rotation of the rewinding roller 65 and the guide roller 70.

This means that the fiber within the spinning chamage 6. This means that the original yarn piecing operation has been terminated.

When the yarn piecing operation is. terminated, it is necessary to carry out the operation for taking up spun yarn by means of the take upro'ller 8 on the side of spinning machine. For this purpose, the motor 36 is switched into reverse rotation. At the same time dis charge nozzle 64 is moved by spring force 89. The yarn guide cam cutter 78 is positively and quickly retracted with the force of the spring 89 by engaging the electromagnetic clutch D for cam 66 and the electromagnetic clutch F for lever 77 as shown in FIG. 9. Therefore the package 6 is pressed against the take up drum l0, and the taking up operation is carried out.

However, when the yarn is being spun, even for a short time, said discharge nozzle 64, rewinding roller 65, and guide roller 70 are quickly retracted. Therefore it is necessary that the rewinding roller 65, and the guide roller 70 should be rotated in the spinnable direction.

Therefore, in order to keep the pressure of the pressroller 72 against the discharge roller 8 in spite of the separation of a part 73 from the bracket 71, a ratchet wheel 91 is provided on one end of the lever 90. The position of the press contact is kept with the pawl 92, and therefore the revolution of the discharge roller 8 is transmitted to the rewinding roller 65 and the guide roller 70.

Thus, when the yarn, which is now being spun is perfectly separated from the guide roller 70, the engagement of the pawl 92 against the ratchet wheel 91 provided on the lever 90 is released by the energization of the solenoid 93. The press-roller 72 is thereby rotated as far as the position of bracket 73 by the force of the spring 94.

The package 6 pressed against the rewinding roller 65 is also pressed against the take up drum 10 along with the retraction of the rewinding roller 65, by means of its own weight, and the rotation is given thereto.

When the guide roller 70 is retracted, the yarn is more easily separated from the guide roller 70 because the yarn keeps the spinning position by means of the tension thereof.

When the discharge nozzle 64 is retracted, the motor 36 is stopped and at the same time, the electromagnetic clutches D, F are also separated. The operation of the automatic yarn piecing machine 21 is also terminated, and it is restored to the state that yarn piecing operation can be started in the next yarn ending spinning unit. 1

Thus, in the yarn piecing spinning unit wherein the automatic yarn piecing machine 21 is perfectly separated, the yarn is connected to the take-up drum 10 and the discharge path 7 in a straight line form. At said po- I sition the yarn goes across the top roller 9 pressing against the discharge roller 8, and therefore the yarn is directly guided into the handle portion of the discharge roller 8 and the top roller 9. Then yarn is discharged immediately by an automatic taking machine provided with top roller 9, and the normal spinning operation is carried out.

In the above given explanation, the yarn discharge nozzle is moved forward after the termination of the cleaning of the spinning chamber. In order to shorten the yarn piecing time, the discharge nozzle can bemoved forward during the period of cleaning the spinning chamber.

The operations of the yarn piecing portion are explained in accordance with the circuit diagram of FIG. 18.

When the lever 77 for moving the yarn guide cam cutter 78 is retracted the limit switch LS is being pushed, and the relay X is turned on.

When said lever 77 .is moved forward as far as the predetermined position, the limit switch LS is pushed, and the relay X is charged.

When the timer T for determining the yarn sucking time for starting theoperation along with the start of the normal rotation of the motor 36, is brought to time up, the relay X is turned on because the lever 77 is retracted. Relay X is turned on and the contact X is closed.

Therefore, the electromagnetic clutch F is energized to move the lever 77 forward.

The lever 77 when moved forward pushes the limit switch LS When the lever 77 has arrived at the predetermined position, the relay X is operated to deenergize the clutch F to stop the lever 77 at a predetermined position. At the same time the solenoid 84 is energized to cut off the yarn by operating the rotary edge 85.

The relay X also starts the operation of the timer T The timer T has such a structure that it can be brought to time up when the yarn that is sent through reverse rotation arrives at the collecting surface 5 of the rotary spinning chamber 4. Along with the time up of the timer T the electromagnetic clutch E is switched over to the transmission system from the press roller 72 to transmit the rotation of the press roller 72 to the rewinding roller 65. The guide roller and the rotation is transmitted to the opposite direction.

That is, yarn is taken up on the package 6 in the same manner as in the normal spinning state.

Along with the time up of the timer T the timer T starts the operation, to operate the relay X, with the time up thereof. The motor 36 is thereby driven in reverse. At the same time the clutches D, F are geared against each other, and the lever 77 and the yarn end discharging nozzle 64 are retracted.

In regard to the timer T it can be operated some time after the yarn piecing operation.

Yarn piecing operation is carried out in the following order in accordance with the present invention:

1. The automatic yarn piecing machine 21 detects the spinning unit involved in yarn breakage, and stops at the position in front of the spinning unit involved in yarn breakage through the processes oflow speed driving or inertia driving.

2. The arm 38 is rotated downwards to release the engagement of the two support casings ll, 12, and the arm 38 is retracted to separate the first support casing 11 from the support casing 12.

3. The spinning chamber 4 is driven by inertia.

4. The cleaning nozzle-54 is moved forward and enters into the spinning chamber 4. l

5. After the termination of cleaning, the cleaning nozzle 54 is retracted, and then said arm 38 is moved forward to connect the support casing 11 to the support casing 12. The arm 38 is then rotated upwards, and the spinning chamber 4 is rotated at a high speed.

6. The solenoid 62 is energized, and the package 6 is separated from the take-up drum l0.

7. When the yarn end discharging nozzle 64 is moved forward and the above mentioned solenoid 62 is deenergized, the package 6 is pressed against the rewinding roller 65, and the rotation in the rewinding direction is transmitted to the package 6 by the rotation of said roller 65.

8. The yarn end is passed through the slit of the nozzle 64, and said yarn is introduced above the spinning unit involved 'in yarn breakage by means of the yarn guide-cam cutter 78. At the same time the yarn introduced into the handle portion of the guide roller 70. Y

9. Solenoid 84 is energized to rotate the rotary edge 85 and yarn cutting is carried out, while at the same time the timer is operated.

l0. The yarn end is introduced into the rotary spinning chamber 4 by the sucking air stream of the discharge path 7.

l l. The supply of the fiber by means of the feed roller 1 is commenced by the time up of said timer, and at the same time by the rotation of the press-roller 72 pressed against the discharge roller 8. The normal rotation is transmitted to the above mentioned rewinding roller 65 and the guide roller 70.

12. While the press-roller 72 is pressed against the discharge roller-8 by the engagement of the rachet wheel 91 and the pawl 92, the discharge nozzle 64, the rewinding roller 65, and the guide roller 70 are retracted.

l3. Thereafter, the solenoid 93 is energized, and the engagement of said ratchet wheel-91 and the pawl 92 is released, and the press-roller 72 is separated from the discharge roller 8 i i 14. The yarn is introduced to the handle portion of the discharge roller 8 and the top roller 9 by means of the automatic pinching device provided on the top roller 9.

In accordance with the present invention, the automatic yarn piecing machine stops accurately at the position in front ofthespinning-unit involved in yarn breakage, and thecleaning of the spinning chamber is carried out by a sucking air stream. The catching of the yarn end is also carried out by the sucking air stream generated within a wide range and the rewinding of the package. Therefore the operations can be easily carried out In particular, the guide roller is capable of catching the yarn end rewound by the package above the yarn discharge path connected to the spinning chamber. The cutter can be operated right below the guide roller and therefore the introduction of the cut yarn end, into the discharge path can be very easily carried out. The determination of the timing for the yarn end to arrive at the spinning chamber can be easily done, and therefore the control of the yarn piecing operation can be accurately done. lnv addition, the yarn havingbeen ended with the supplied fiber is drawn out synchronously withth'e spinning speed of the spinning machine, andtherefore the yarn piecing operation can be smoothly performed.

What isclaimed is:

1. An automatic yarn piecingprocess in a continuous ringless spinning machine in which fibers are fed into a spinning chamber and withdrawn as a yarn to be wound onto a package which comprises the steps of detecting the breakage of yarn; finding the end portion of the yarn wound on the package at a predetermined position; drawing the yarn end from the package by means of suction; guiding said yarn to the neighborhood of the spinning chamber of the spinning unit involved in yarn breakage; cutting off the yarn with a predetermined length thereof left out on the side connected to the package; introducing said yarn end connected to the package into the spinning unit involved in yarn breakage through said spinning chamber; joining said yarn end with fibers delivered to said spinning chamber and continuously discharging a spun yarn from the spinning chamber.

2. An automatic yarn piecing process in accordance with claim 1 which further comprises the step of carry- 14 ing out the removal of the remaining fiber by generating sucking .air stream into the spinning chamber after having detected the yarn breakage.

3. The automatic yarn piecing method according to claim 2, wherein the steps of removing the remaining fiber from said spinning chamber and discharging the yarn end from said package are simultaneously carried out.

' 4. An automatic yarn piecing device in a continuous ringless spinning machine having a spinning chamber and a yarn winding package comprising yarn breakage detector means, suction means (64, 75, 76) for catching the end portion of the yarn wound on the package and for locating the yarn end at a predetermined position; means (85, 86) for guiding said yarn end to the neighborhood of the spinning chamber of the spinning unit involved in yarn breakage by engaging said yarn; means for cutting the yarn end to leave a predetermined length thereof on the side connected to the package, means (70, 65) for introducing said yarn end connected to the package into the spinning unit involved in yarn breakage through the spinning chamber to join said yarn end with fibers delivered to said spinning chamber while unwinding said yarn end from said package, means for thereafter continuously discharging a spun yarn from said spinning chamber, and means (E, T for controlling said yarn end from the spinning chamber continuously in synchronous relation to the start of the spinning operation after said yarn end has arrived at the spinning chamber (4).

5. An automatic yarn piecing device in a continuous ringless spinning machine having a spinning chamber and a yarn winding package comprising yarn breakage detector means, suction means (54) for removing remaining fiber by generating a sucking air stream into the spinning chamber after having detected the yarn breakage, means for catching and withdrawing the end portion of the yarn wound on the package at least as soon as the remaining fiber has been removed, means for drawing the yarn, means for locating the yarn at the predetermined position, means for engaging and guiding said yarn end to the neighborhood of the spinning chamber of the spinning unit involved in yarn breakage, means for cutting off the yarn end by leaving a predetermined length thereof on the side connected to the package, means for passing said out yarn end through said spinning chamber while rewinding the same from said package, means for introducing the yarn end connected to the package into the spinning unit involved in yarn breakage, and thereafter for continuously drawing said yarn end, and means for controlling said yarn end after said yarn end has arrived at the spinning chamber whereby said yarn'end can be continuously drawn out from the spinning chamber in synchronous relation to the start of spinning operation.

6. The automatic yarn'piecing device according to claim 4, wherein the means for locating said yarn end is comprised of means (65) for rotating the package in the rewinding direction, and suction retaining means (64, 75, 76) adapted to be positioned against the outer peripheral surface of the package for spinning the caught yarn end at the predetermined position by draw- 1 ing the caught yarn end from the package.

7. The automatic yarn piecing device according to of which is bent and which further includes a continuous slit (75) from the end thereof to the lower portion of the bent portion whereby the sucked yarn end can be passed through the yarn end discharging nozzle.

8. The automatic yarn piecing device according to claim 7, wherein the end portion of said yarn end discharging nozzle is open and extends in the axial direc tion of said package.

9. The automatic yarn piecing machine according to claim 6 wherein said means for rotating the package comprises a rewinding roller (65) rotating the package in the rewinding direction, and wherein said suction retaining means (64) is adapted to be rotated whereby the end portion thereof can be positioned against the outer peripheral surface of said package, the rewinding roller (65) being adapted to be pressed against the package which has stopped the operation for taking up the spinning yarn by the displacement of said suction retaining means to the working position.

10. The automatic yarn piecing machine according to claim 9 which further comprises a take-up drum, engaging means (95, 62) for separating the package from the take-up drum (10) and for turning back to the original position, said rewinding roller (65) being connected to said suction retaining means (64) for rotating the package in the rewinding direction, whereby said package is pressed against the rewinding roller (65) which is thereby displaced to the working position.

11. The automatic yarn piecing machine according to claim 10, wherein said engaging means (95, 62) are comprised of a push lever (95) for engaging the package with the engaging portion at the end thereof and a solenoid mechanism (62) for rotating said push lever.

12. The automatic yarn piecing machine according to claim 11, wherein a pair of guide rollers are provided parallel with the inlet portion (81) which is open in the path of moving yarn, the side ofsaid guide rollers which is adjacent said inlet portion being formed in a tapered shape.

13. The automatic yarn piecing machine according to claim 4 which further comprises a guide member (78) for connecting the yarn end drawn from the package and cutting members (85, 86) for cutting the yarn end at said predetermined position by transmitting the yarn end which is engaged against said guide position to the neighborhood of the spinning chamber (7) of the spinning unit involved in the yarn breakage.

14. The automatic yarn piecing machine according to claim 13, wherein said guide member is provided between the discharging nozzle and spinning unit involved in yarn breakage, and reciprocates therebetween, said guide member having a V-shaped guide portion (79) and a guiding surface (96) for guiding the yarn end coming out from the discharging nozzle into the moving trace of said guide portion, said cutting member having a movable edge (85) and a fixed edge (86) disposed on the V-shaped portion of said guide portion.

15. The automatic yarn piecing device according to claim 4, wherein said means for introducing said cut yarn end into the spinning unit involved in yarn breakage and for continuously drawing said yarn end, is comprised of a pair of guide rollers (70) and reversing means for said guide rollers (70), said guide rollers (70) being placed on the running trace of the finished yarn by the movement thereof, and said reversing means being arranged to rotate said guide roller in the normal direction so that the yarn can be unwound from the package and, in the reverse direction, so as to discharge yarn from the spinning chamber.

16. The automatic yarn piecing device according to claim 4, wherein the means for introducing the said cut yarn end into the spinning unit involved in yarn breakage and for continuously drawing out the yarn end, is comprised of means (70, 65) for leading said cut yarn end into the spinning unit involved in yarn breakage through the spinning chamber while winding said cut yarn end from the package, and means (72) for transmitting rotation at such a speed as to be synchronous with the driving speed of the spinning machine.

17. The automatic yarn piecing device according to claim 16 which comprises means for pressing the rewinding roller (65) against the package, means for passing the press-roller (72) against the discharge roller (8) of the spinning machine by the displacement of the suction nozzle to the working position, whereby the rotation of the press-roller is transmitted to the unwinding roller and said guide roller, and clutch means (e) for reversing the rotation of the guide roller at a predetermined time.

18. The automatic yarn piecing machine according to claim 17, whrein the press-roller is adapted to be continuously pressed against the discharge roller (8) of the spinning machine till the finished yarn is released from said guide roller when the guide roller is turned back to the original position.

19. The automatic yarn piecing machine according to claim 4 which further comprises an unwinding roller, means for driving said unwinding roller for rotating the package in the unwinding direction by contacting the same against said package, a discharge nozzle, said unwinding roller being connected to the upper portion of said discharging nozzle, the discharging nozzle having a slit continued in the length wise direction, a cam for rotating said discharging nozzle on the outer peripheral surface of the package when said nozzle detects the yarn breakage, a guide member connected to said discharging nozzle for guiding the yarn end from said discharging nozzle to the neighborhood of the spinning chamber of the spinning unit involved in yarn breakage by engaging the yarn end from the discharging nozzle, a pair of guide rollers for nipping the yarn end guided by said guide member, means for unwinding and discharging yarn from the spinning chamber, a clutch for reversing said rotation into the transmission system by transmitting the rotation to said unwinding roller and guide roller and a press-roller for pressing against the discharge roller of the spinning machine.

20. The automatic yarn piecing machine according to claim 19, wherein said press-roller includes a rotary lever that is pressed against the discharge roller of the spinning machine by means of the rotation of the discharging nozzle, the position thereof being retained by the engagement of a ratchet wheel (91) and a pawl (92), and after having pieced the broken yarn, said engagement being released by the effect of a solenoid (93) so that the press roller can be separated from the discharge roller.

21. The automatic yarn piecing machine according to claim 5, wherein the means for removing the remaining fiber is comprised of means ('38) for opening the spinning chamber by engaging the spinning unit involved in yarn breakage, and fiber treating means (54) for suck-

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Classifications
U.S. Classification57/263, 57/407, 57/302
International ClassificationD01H4/00, D01H4/24, D01H4/48
Cooperative ClassificationD01H4/48, D01H4/24
European ClassificationD01H4/24, D01H4/48