DE2126498A1 - Machine for making, filling and sealing bags - Google Patents

Description

PXtentanwXctb

DR. I. MAAS? 1 78-98

DR. W. PFEIFFER, ■ * ~ ' ^{L U} ^ ^Q DR. F. VOITHENtEITNER

8 MUNICH S3 UNaERSTR, 2S-TEL.38023

Triangle Package Machinery Company Chicago, Illinois, V.St.A.

Machine for making, filling and sealing

of bags

The invention relates generally to a machine for producing, Filling and sealing of bags and in particular; a device for attaching transverse Seals at a mutual distance along a multilayer web of heat-sealable material.

Usually such bag machines have a feed device for a web of heat-sealable material,

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which runs over a molded part and formed into a tube will. In known machines sealing jaws are provided, which move towards each other and the Pinch the tubular web between you. The Bakken then move downwards, causing the Pull the web further and at the same time the top of the lower bag and the bottom of the next, seal the overlying bag. The desired goods are placed in the hose with the closed end filled through the open top thereof before that end is sealed and severed from the web. After the jaws have moved down and separated on such machines, they will sweep return to its uppermost position to repeat the work cycle.

With a horizontal bag machine they move tubular web or multiple layers in a flattened state in a horizontal direction and it Seals are made at suitable intervals in the transverse direction of the web. This creates the bag, but the unsealed edge can form the opening for filling in the goods.

The production of the transverse seals is important when considering the machine performance and the The speed at which the seals are made and the web is advanced is important. They are different Types of making transverse seals have been suggested including Sealing jaws, which is in an elongated closed path

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move either gradually or continuously, as well corresponding jaws, which are mounted on constantly rotating wheels.

However, there are still difficulties in terms of a relatively simple adjustment, whereby the length of the bags depending on the type and quantity of goods that are to be filled into a particular bag, can be changed from time to time.

The device according to the invention has a pair of rotating organs, on each of which one or more Sealing elements are pivotably arranged, which are brought closer to one another and into mutual contact, wherein the web is pinched between them. If this Organs continue to rotate, the shafts to which they are attached move away from each other, while the two Organs with respect to each other about their respective axes maintain the same speed, so that the clamped together Sealing elements move in a straight line and pull the web further while they are being sealed. Resilient devices are provided, which normally load the rotating organs on one another, so that upon movement of the sealing jaws from their initial contact with the web into one through the Centers of the organs running plane these centers move away from each other. When the sealing jaws then move forward to the opposite side of this plane, the midpoints around which are approaching the rotatable organs are hinged to each other.

A suitable stop device limits the movement

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of the rotatable organs towards each other and when they are reached This limitation causes continued rotation of the organs to separate the sealing elements and stop them the web feed. It can be seen, however, that there is a sufficient number of sealing elements on each rotatable member can be provided so that the web can move continuously if desired.

The structure of the device of the invention is selected so-W, that not only a manual adjustment for varying the length of the set bag, but also automatic control is possible, and means responsive to an appropriate mark on the track means controls the time at which the sealing elements separate from each other.

The invention is intended to provide a sealing device for forming transverse seals in a multilayer web conveyed by a machine for making, filling and sealing bags are designed so that they have the disadvantages of known, comparable bag machines does not have.

The invention is also intended to provide a device for transversely sealing a multilayer web of a heat-sealable one Material can be created at intervals along the length of the web, the distance between them Cross seals either automatically or by hand changed and thereby the length of the bags produced can be changed.

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The invention is also intended to provide a device for forming a plurality of transverse seals arranged at mutual spacings along the stretch of the river a multilayer web of heat sealable Material can be created, wherein several sealing members are attached to rotatable elements, which rotate in opposite directions, thereby bringing pairs of corresponding sealing elements together and pinching the web therebetween so that the material seals and a predetermined distance is pulled further, and wherein the rotating organs are mounted on shafts, which towards each other and moved away from each other.

Finally, the invention is intended to provide a machine for Manufacture, filling and sealing of bags with a device for the transverse sealing of the multilayer web are made of heat-sealable material at mutual intervals along the longitudinal extension of the same, whereby by changing the time span in which the sealing jaws grip the web and release it again, the size of the bags produced is controlled either by automatic or by manual adjustment.

The invention is explained in more detail, for example, with the aid of the figures. Show it

Figure 1 is a front view of a preferred embodiment form of the machine according to the invention with a pair of. rotatable sealing elements, which are initially the multilayer web made of heat-sealable material wedged between them,

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Figure 2 is a view similar to Figure 1, in which the same pair of corresponding sealing elements is shown at the point of their movement at which the centers of the rotatable organs are farthest apart and with the sealing elements in the through the middle the revolving organs are in the plane,

Figure 3 is a plan view of the machine shown in Figures 1 and 2, but with the molded part and the filling hose are omitted

FIG. 4 shows an enlarged partial section through part of the machine essentially along the line ¹ ^ -U in FIG. 3,

FIG. 5 is an enlarged horizontal side view, partially sectioned essentially along the line 5-5 in FIG. 1;

FIG. 6 is an enlarged vertical section essentially along the line 6-6 in Figure 3, parts of which are shown in side view,

Figuxn7, 8, 9 and 10 somewhat schematic representations the various positions of the respective sealing elements in the manufacture of a bag from the initial contact with the web to the point at which they only separate through continued rotation of the rotatable organs,

Figures 11, 12, 13 and IH somewhat schematic representations

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the trajectory of corresponding sealing elements, where however, the automatic control device is used to regulate the bag length and the corresponding Sealing elements separate automatically before they normally only because of the continued Rotation of the rotatable members, producing a bag which is shorter than that in FIG is shown in Figures 7-10, and

FIG. 15 shows another embodiment of a sealing element, the outer ends of which are arcuate instead of flat are.

According to Figures 1, 2 and 3, the device according to the invention has a frame, which consists of uprights 1 and 2 on the front and back of the frame, top, front and rear cross members 3 and 4 and the horizontal side beams 5 and 6 consists. At the front of the machine is another horizontal one Cross members 7 are provided to support the front ends of a pair of shafts, as further explained below. A cross member 8 is provided near the lower end of the frame, which supports the compressed air and hydraulic cylinder assembly forms the control the bag length is used, as also explained below. >

Bag machines of the general type to which the present Device belonging can be designed as either vertical or horizontal machines. As an an example a vertical machine is chosen here, in which

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a web W of a suitable heat controllable material a diverted path from a suitable supply source, like a roller, to a molded part 9 passes through. When the web slides over the molding, it will Deformed to a tube shape around a filling tube 10. Usually at such a vertical one moves Machine a sealing element 11 in contact with the overlapping longitudinal edges of the web, so that a Longitudinal seal produced and the tubular shape of the heat controllable material is completed. Then become transverse seals at intervals along the longitudinal extension of the tubular web which form the bottom of a bag to be filled and which Seal the top of an already filled bag. All of this is known to the person skilled in the art.

In a horizontal bag machine, the web can either be folded upon entering the machine or it has already been folded beforehand to form a multilayer web and the vertical transverse seals to form the bags are attached at mutual distances. Usually horizontal Machines the bags first made and then filled in a subsequent station, after which the open top end closed and heat sealed.

Of course it is clear _? that, with regard to the present invention, the web fed to the horizontal transverse sealing elements, instead of being guided over a molded part to form a tube, can also have been previously formed into a multilayer web. The bag can be in

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filled and sealed in the manner shown here or only sealed in the transverse direction, the longitudinal seal up to a certain point after which, filling can be omitted.

As mentioned above, transverse sealing elements are used, with sealing jaws engaging the web at an upper point and then pulling it downward, whereupon the jaws separate from one another and essentially in one in a straight line to return to their topmost position.

Another embodiment of transverse sealing elements can be designed to be rotatable, with one or more pairs of Sealing jaws on opposite sides of the web move in a closed path. Such a closed one Path can be elongated, as shown in US Pat. No. 2,969,8H3, or the carrier of the sealing elements may be circular and rotate continuously, for example in the manner shown in US Pat. No. 3,212,229.

In this latter type of sealing device, the sealing jaws are so attached to their rotating support that the jaws move in a substantially radial direction with respect to the rotatable member during the sealing of the web move.

A feature of the invention is the use of rotatable Organs which are pivotable or otherwise articulated so that they move towards and from each other move away during the sealing process

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during which each pair of sealing elements abuts one another with the web sandwiched between them is.

In the illustrated embodiment of the invention are two rotatable members, generally designated 12 and 13, respectively, are provided. These rotatable organs can be made from either Wheels exist to which the sealing elements are attached, or they can have the shape of star arms, "as shown. The rotatable member 12 is rotatably mounted on a shaft 14, which is in the frame from the front extends rearward and is suitably supported in bearings within a sleeve 15. The other rotatable Organ 13 is mounted in the same way on a rotatable shaft 16 which is in the bearings 17 inside the Sleeve 18 is mounted.

Each of the rotatable members 12 and 13 is provided with a plurality of sealing elements or jaws, which are supplied with heat by suitable means known to those skilled in the art will. The number of these elements varies from one on each organ to several depending on the length of the one to be made Bag, the speed of rotation of the organs and whether the web moves gradually or continuously shall be. The greater the number of sealing elements for a given diameter of the rotatable member, the more the bags and the space between them are shorter the cross seals. If the number of sealing elements is big enough for a couple to come together and pinch the web between them and pull it on, before the previous pair parted and the movement

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the web has stopped, then the web moves continuously.

In the embodiment shown, this is rotatable Organ 12 with three radially extending arms 19, 20 and provided. The rotatable member 13 is also with the the same number of radially extending arms 22, 23 and 24 provided. At the end of each of these arms is a cheek or sealing element provided and when they are rotated, opposing elements come together in corresponding pairs to form a transverse seal and to Pulling the web of material on.

Those attached to the outer ends of the radial arms Sealing elements of the rotatable member 12 are denoted by 25, 26 and 27, while the comparable elements on the rotatable member 13 with 28, 29 and 30 are designated.

In Figures 1, -2 and 7-14, each element is with a flat face and on its associated arm and jades is usually represented by a pair of springs, such as those shown for example are each denoted by 31, resiliently held in such a position that there is a continuation or a forms radial approach of the associated arm.

The flat end faces of each sealing element come in corresponding Pair together with the web in between and the end faces lie flat against one another. Each sealing element on the rotatable member 12 is provided with a slot 32 and each sealing element is on the rotatable member 13 provided with a cutting edge 33. When the end faces of the

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corresponding elements, for example, of elements 27 and 30 in Figures 1 and 7-14, will come together the top of a filled bag B and the bottom of the next following bag formed by the transverse seal and the knife 33 slides into the slot 32 of the corresponding element and cuts the web at this point. It can be seen that instead of the knife too other means of severing the web can be used can, if desired.

Since the shafts 14 and 16 are in opposite directions rotate, they take the rotatable members 12 and 13 and the sealing elements located thereon up to one Place where a pair of sealing members 27 and 30 come together and pinch the web between them. The pivot bearings for these particular sealing elements are labeled 34 and 35. Every sealing element is the same provided with a pair of rollers, as shown for example at 36 and 37 and which with vertically extending guide rods 38 and 39 cooperate, which are arranged in the movement path of these sealing elements are to align the end faces thereof substantially parallel to each other before they meet.

For a particularly effective operation of the device, it is useful that the flat end faces of opposite sealing elements come together essentially parallel to one another in contact with the web, instead of their edges first meeting and they then come together in a rolling motion. If therefore turn the arms towards each other and the rollers on the

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corresponding sealing elements come to rest on the guide rods 38 and 39, the sealing elements and rotate move the end faces of opposite pairs parallel to each other so that they move into their in Figure 1 move shown positions and come together.

When the rotating organs keep turning and the arms and move the corresponding sealing elements out of their positions shown in FIG. 1, shift these elements straight down. To enable this rectilinear movement of the sealing elements, move the shafts 14 and 16 to which they are attached move away from one another into the positions shown in FIG or are pushed into these positions. From Figure 2 it can be seen that in this position one through the middle The horizontal plane going through the corresponding sealing elements also goes through the centers of the shafts IH and 16. At this At this point, these waves are at their greatest mutual distance. When siqh the rotating organs and arms continue to rotate and the corresponding sealing elements move further down and pull the web with them, move the shafts 14 and 16 move back towards each other or become moved in this direction until they are stopped and the corresponding elements separate or until this inward movement of the waves is stopped in another way, as described in more detail below.

The shafts 14 and 16 can be moved about a pivot point and therefore their centers move on an arc line. The horizontal plane through these waves which also by the corresponding, adjacent

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Sealing elements is located on this skin when the waves are furthest apart. It can also be provided other storage facilities, if desired ₄ which eine'Verschiebung effect of the waves in a straight line.

The shafts 14 and 16 can move arcuately toward and away from each other about the shafts 40 and 41 run as a pivot bearing, each of which has the sleeves "42 and 43, respectively. The shafts 40 and 41 are in suitable Bearings 44 rotatably mounted on the front of the frame in the cross supports 7 (see Figure 4). Both waves are mounted so that they can rotate about their own centers and that the sleeves 42 around these shafts can pivot around the same centers.

The sleeve 15 on the shaft 14 is connected to the sleeve 42 on the shaft 40 by means of a plurality of arms 45, 46 and 47. The sleeve 18 on the shaft 16 is with the sleeve 43 on the Shaft 41 also connected by means of several connecting arms 48, 49 and 50 (see Figures 3 and 4). The two help sen 15 and 42 are similarly connected by a plate 51 at their rear end, while a similar one Plate 52 connects the sleeves 18 and 43. These are specially shaped connecting arms and can be intermediate gears wear, as explained in more detail below.

Between the ends of the various waves mentioned above a pair of lever arms 53 and 54 is attached at one end to the sleeve 43 and extends therefrom inside (see Figures 3, 4 and 5). At their other ends

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these lever arms are pivotably connected to the links 55 and 56, respectively. The lower end of each link 55 and 56 is by means of suitable pivot pins on the outer ends a guide part 57 is pivotably articulated.

Similarly, on the other side of the frame is a pair of lever arms 58 and 59 at one end with the Sleeve 42 connected and extends inward from there. The opposite end of each lever arm 58 and 59 is pivotally connected to the links 60 and 61, respectively. The lower end of each of these latter links is also connected to the same guide part 57 by suitable pivot pins.

It can be seen that the movement of the two shafts 14 and 16 away from each other along with their respective sleeves 15 and 18, respectively, rotate the lower sleeves 42 and 43, respectively so that the ends of the lever arms 53, 54, 55 and 59 are raised upwards and carry members 55, 56, 60 and 61 with them. The movement of shafts 14 and 16 towards one another causes a downward movement of said members in a similar manner. The other way round calls upward movement of the links results in displacement of shafts 14 and 16 away from each other and downward movement the same causes a movement of the waves towards each other.

It can also be seen that the movement of the guide member 57 and the lower ends of links 55, 56, 60 and 61 are stabilized and in a straight line should run in order to avoid a lateral push

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and to ensure that the same pressures are exerted by the two sealing elements lying against one another. This can be done on take place in various ways, either by providing guideways for the guide part 57 or by the rest of the arrangement to which the guide part is connected is rigidly retained, as explained below.

The rotation of the shafts · IM and 16 and attached rotatable members 12 and 13 inducing drive w device has a drive motor M having an output shaft 62 on which a sprocket 63 loading - is fastened. The articulated chain 64 runs around the sprocket 6 3 and a second sprocket 6 5 on the shaft 66, which is rotatably mounted in a suitable manner in a support 6 7.

The opposite end of the shaft 6 6 carries a sprocket 68 and rotates as a result of the rotation of the shaft 66 by the aforementioned drive from the motor (see Figure 3). A link chain 69 (Figures 1 and 2) runs around the sprocket 68 in the upper part of the frame, then around the sprocket wheel 70 on the shaft 71, which is in a bearing support 7 2 is rotatably mounted to the large sprocket 73 and a second large sprocket 74 so that these last-mentioned sprockets rotate in opposite directions.

Said drive causes the shafts 40 and 41 to rotate and also by means of a suitable gear reduction a rotation of the shafts 14 and 16 with the rotatable members 12 and 13 located thereon in opposite directions

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services. For this purpose, a gear 75 is attached to the shaft 41, which meshes with an intermediate gear 76 which is rotatably mounted on a stub shaft 77 on the rearmost connecting arm or the plate 52 (see Figures 4 and 6). This intermediate gear meshes with the gear 78 on the shaft 16, whereby this shaft and that on it seated rotatable member 13 in the counterclockwise direction, viewed according to Figures 1 and 2, rotated.

A similar arrangement is provided on the opposite side of the frame, with a gear 79 on it the shaft 40 is fixed and meshes with the intermediate gear. This in turn meshes with the gear 81 of the shaft 14, whereby the same and the rotatable member 12 seated thereon are rotated clockwise.

It can therefore be seen that the drive described above causes the rotatable members 12 and 13 to rotate continuously in opposite directions and that the direction of rotation of the rotatable members and their speed of rotation are equal to the direction of rotation and the speed of the driven shafts 40 and 41 associated with each of these organs, respectively. This speed of rotation of the rotatable organs is due to their movement towards and away from each other as a result of the action of the Adjacent sealing elements are not changed. Whenever there is a pair of opposing sealing elements hits and the material web is pinched between itself, the web is sealed, separated and removed from the in Figure 1 is pulled straight down until the elements have moved to a point that

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substantially equidistant on the opposite one Side one through the centers of waves IH and 16 running level. During this time the shafts 14 and 16 will move away from each other and then again moved towards each other until they hit suitable anchorage devices. One continued rotation of the rotatable Organs then causes a separation of the sealing elements and the next pair of sealing elements becomes the * Carrying out another work cycle brought together. As mentioned above, each of the rotatable organs can only use be provided with a sealing element, in which case the pairs only meet after a rotation of 360 ° would. Additional sealing elements on each organ cause successive pairs and to meet more often thereby the production of a larger number of bags with the same rotational speed of the organs.

Resilient means are provided to urge shafts Ik and 16 towards each other, and it can be seen that during the first part of the movement of the sealing elements lying against one another, these shafts move apart against the force of the resilient means, but this force causes a Movement of the shafts towards one another and keeps the sealing elements in contact with the web until they hit a suitable stop device.

These resilient devices can have any shape and either be designed mechanically or work with a compressible pressure medium. As an example, a cylinder with a piston is shown here, which by fluid pressure, for example air pressure, in a

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appropriate direction is pushed to press the rotatable members towards each other. The piston rod of the same is connected to the associated articulation and a movement of the piston rod downwards under the The effect of the fluid pressure causes the shafts and the rotatable members to be pressed towards one another. How out FIGS. 1 and 2 can be seen, is a compressed air cylinder 82 is provided with a piston 83 which is connected to a piston rod 84 which extends upward through extends the closed top of the cylinder. The upper end of the piston rod 84 is on the guide plate 57 attached in the middle of the same. A compressed air line 85 is provided through which compressed air to the upper End of the cylinder 82 can be fed.

It can therefore be seen that the pressurized air normally pushes piston 83 and its piston rod 84 downward. Since the piston rod 84 is connected to the guide part 57 is, with which in turn the members 55, 56, 60 and 61 are connected, the compressed air presses these members and the related parts down. It can be seen that this force via the lever arms 53, 54, 58 and 59 and the arms 48, 49, 50 and 52 on the one hand and the arms 45, 46, 47 and 51, on the other hand, causes the two shafts 14 and 16 and the rotatable members attached to them to remain constant are pressed towards each other.

When the guide plate 57 comes to rest against the closure at the upper end of the cylinder 82, a stop is formed which prevents the shafts 14 and 16 and the rotatable members 12 and 13 from moving further towards one another. In this way the length of the bag produced is controlled.

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It will . Assume, for example, that after the web is clamped by the sealing elements in the position shown in FIG _{; i5: the} horizontal plane runs through the centers of the sealing elements and also through the centers of the shafts 1 and 16. It is noted that the guide part 57 and the piston 83 are raised to their highest position and that the two shafts are at their greatest mutual distance. In this same example, the guide portion 57 has moved upward from the closed upper end of the cylinder 82 a distance which is proportional to the distance which the sealing elements have traversed.

Another rotation of the rotatable organs and simultaneous Movement of the sealing elements downward takes place until the guide part 57 is at the top closure of the cylinder 82 comes to the plant, at what point in time the sealing elements moved down another 10.2 em (U inches) and made a 20, H: cm (8 inches) long bag. At this point the movement of the rotatable members towards each other ceases and a further rotation of the same ceases causes the sealing elements to be separated, as shown in FIG. 10, for example.

If so desired, only use bags of the same at all times No adjustment is required to make the size and fixed stops can be provided to prevent the inward movement of the rotatable members as desired To limit extent, and the resilient device can Ie-

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diglieh consist of a tension spring, which is attached to the joint pulls down. For most uses of such a machine, however, it is desirable to be able to make bags of various lengths can, and for this reason both manual control and automatic control of the length of the boat are possible intended.

Assuming that the stroke of the piston rod 84 in Figures 1 and 2 has reached its maximum, then that is Length of the bag produced is the maximum length that can be produced with this particular machine. It can then be seen that with a shorter stroke of the piston rod 84 the two corresponding sealing elements later arrive in the clamped position than normal and separate sooner than normal, reducing the bag length is shortened.

In the particular embodiment of the invention described becomes the stroke of the piston rod 84 and consequently the distance by which the guide part 57 moves during of a given duty cycle is moved by adjustment the cylinder position up or down in an axial direction ijieölims.

As can now be seen, an arrangement is also provided which automatically stops the inward movement of the rotating members and thereby controls the bag size. These The latter control device has a second cylinder 86 which is connected either in series with the cylinder 82 is or is a continuation of the same

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represents, with a suitable wall the two cylinders separates. The cylinder 86 contains a hydraulic medium, while the cylinder 82 is supplied with compressed air, and it Suitable seals are provided to keep the two fluids separate. ■. ,

The cylinder 86 includes a piston 87 which is on the the same piston rod 8 ^ is attached as the piston 83. | A hydraulic medium line 88 is connected to a suitable opening in the cylinder 86 at its upper end, while a line 89 in the same way with a suitable one Opening in the lower end of the cylinder 8 6 is connected, and the two lines are connected by a third line 90 connected to one another, in which a valve 91 is arranged.

Any suitable type of valve can be used so that when the valve is open and the Piston 87 hydraulic fluid outward through conduit 88 and valve and then during bag manufacture flows back to the cylinder below the piston through line 89. The reverse effect takes place during the last half of the bag production takes place, while the sealing elements emerge from their shown in FIG . Move the position down to the point of separation. When the valve 91 is closed, there is no fluid flow through it is possible, or if it is throttled, so that the fluid flow through it is also throttled it acts in the same way on the abovementioned stop means to control the length of the bag produced.

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One of the most important advantages of the invention is that The bag length can be controlled either by hand or automatically. The band stiffening will first be explained.

As mentioned above * it can be assumed that the Cylinder 82 and cylinder 86 in their lowest position * - where the maximum bag length is made will. If the device is to be manually adjusted to produce shorter bags, it can be effected by upward movement of the compressed air cylinder 82. It is noted that a lug 92 stands out from the lower End of the cylinder 86 extends downward. An adjustment pin 93 is at its upper end in the neck 92 screwed and protrudes downward through the cross member 8. Terminal nuts 94 and 95 engage the threaded pin 93 to determine the arrangement in any setting position. As mentioned above, the cylinders can be replaced by a suitable, Device not shown are held rigidly so that a rectilinear movement of the guide part 57 is guaranteed *

To make a shorter bag, use the threaded pin 93 adjusted so that the cylinder assembly is shifted upwards. This setting also moves the Guide part 57, the members 55 * 56, 6Ö and 61 and äie Lever arms 53, 54, 58 and 59, to which these members are pivotably articulated, upwards. As a result of the above described arrangement, the sleeves 42 and 43 are rotated in such a direction that the shafts 14 and 16 can be moved further away from each other and the rotating

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organs'12 and 13 on which the sealing elements sit » carry with them.

During the working cycle, the uppermost position of the guide part 57 is always the same, as shown in Figure 2, whereby the shafts IU and 16 are displaced into their positions in which they have the greatest mutual. Have a distance. However, if the cylinder arrangement is in a higher. Location is the stroke of the piston rod and the distance that the associated parts move is shorter.

When the downward movement of the piston rod at a higher Point stopped is shown as in Figure 1 (due to the Raising the cylinder assembly), then the minimum distance between shafts IH and 16 in a given duty cycle larger than shown in Figure 1. The result of this arrangement is that opposite Pairs of sealing elements come together and take the path at a deeper point in their cycle of rotation than shown in FIG. It also follows from this that after the sealing elements have passed through those shown in FIG middle position during the downward movement the movement of the two waves towards each other earlier than normal is stopped and therefore the two sealing elements are separated from each other earlier in their rotation cycle and move away from each other. It follows that the bag length proportional to the distance by which the cylinder assembly is moved upwards, becomes shorter. This can will be explained by referring to Figs. Figure 7 shows the initial encounter

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the sealing elements for a given setting of the anchorage device. Figures 8 and 9 show successive positions of the sealing elements during their downward movement and FIG. 8 shows the penetration of the cutter 33 of one sealing element into the slot 32 of the opposite Sealing element for separating the lower finished bag from the web. Figure 10 shows that when Stopping the movement of shafts 1 ** and 16 on each other a further rotation of the sealing elements causes a separation of the lowest elements, whereby the finished bag B and the formed path is released, which in the illustrated embodiment then its movement interrupted until the next pair of sealing elements 25 and 28 come together and pinch the web. Since these representations are schematic, there is no anchor device shown, but it is clear that such an anchor device must be provided in order to limit the inward movement of the axes of the rotatable members towards one another. A setting of the one described above Anchor devices causes the "appropriate Sealing elements come together later or earlier and sooner or later separate, whereby the Length of the manufactured bag is controlled.

It will be seen that other particular forms of anchor devices used to control the minimum distance between the axes of the rotatable members 12 and 13 than shown here, and it is also clear that the hydraulic cylinder is omitted can be used if only manual control is required. The purpose of the two types of control is to

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that in certain cases the web of packaging material is smooth and unprinted and a manual adjustment is sufficient. If the material web is printed, it is more difficult to find the point of inward movement of the shafts to which the rotating members are attached, set to achieve an exact match * When the film is printed, automatic controls for orientation and bag length are preferred "Ensure that the bag length is correct and that the printing is in the desired location on each bag appears.

According to the description of the hand control for the bag length the automatic control is now considered, wherein the web of packaging film carries cover markings at predetermined intervals, on which an automatic Control device responds 9 whereby the movement of the axes of the rotatable members towards each other is stopped will.

h For this purpose, an electric eye or a similar photoelectrically responsive means is provided which is generally designated 96 and disposed at a vorbestimm ^ th position close to the moving film web, so that it detects the presence of a certain occlusion flag thereto.

If a given coverage mark by the electrical Eye is scanned, it responds via a suitable circuit, so that the valve 91 is closed or partially is closed. This causes the fluid flow

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interrupted or throttled from the cylinder 86 and the Downward movement of the piston rod 84 and all associated therewith stopped or slowed down various parts and limbs. This leads to a halt, or at least to a delay in the movement of the axes of the rotatable members towards each other, which lasts long enough for that a continued rotation of the same causes a separation of the sealing elements lying against one another. These Effect lasts very short and only causes a separation the sealing elements, which lasts long enough to seal the just finished bag B as well as the lower To release the end of the next bag.

This effect can be explained with reference to FIGS. 11 to 14 will. It is assumed that the rotation of the sealing elements is in accordance with an initial convergence of the same Figure 7 causes and that the separation effect according to FIG 8 takes place. A further rotation then brings the web and the sealing elements according to FIG. 11 downwards. On one appropriate predetermined point of this movement becomes the registration mark on the path from the electric eye determined which responds to it in the manner described above and closes or throttles the valve opening , whereby the fluid outflow from the hydraulic cylinder 86 is interrupted or throttled. At this At this point, the axes of the rotatable organs either end their movement towards each other or this movement becomes sufficiently delayed so that the sealing elements lying against one another move with further rotation of the rotatable members separate from each other. This point in the work cycle is shown in FIG.

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Since this effect only lasts until the manufactured bag and the web are released, it opens Valve 91 in turn, so that the fluid flow and a continued movement of the axes of the rotatable members towards one another is made possible, and the corresponding Sealing elements come together again, however no path is included between them, as in Figure 13 shown. From this point on, the normal sequence takes place and the sealing elements separate in the normal course of rotation of the rotatable members.

Figure 15 shows another embodiment of sealing elements, with the outer end of each arm on the rotatable Organs is arcuate, so that corresponding pairs move in rolling contact with the web can. These arcuate surfaces are with 97 at the ends of arms 19 ', 20' and 21 'of wheel 12' and with 98 at the ends of arms 22 ', 23' and 24 'of wheel 13' designated. When these arcuate corresponding surfaces are used, the pivot bearings of the Sealing elements on their respective arms and the guide bars 38 and 39 can be omitted.

From the above description it can be seen that the invention provides a novel apparatus for sealing and severing of pouches formed from a web of heat sealable material. As explained above, allows the arrangement through which the axes of the rotatable Organs can be moved toward and away from each other during bag manufacture, both a hand control as well as an automatic control

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the length of the bag to be produced. Besides, the The direction and speed of rotation of the rotatable members are the same as the direction and speed of rotation of the Drive shafts 40 and Hl. As a result of this drive move the corresponding sealing elements always approach each other at the same speed and it is despite the Movement of the rotatable elements towards and away from each other infoIge the action of the corresponding jaws prevents one of the sealing elements from sliding in front of the other. '

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109860/1288

Claims (13)

Claims Device for producing transverse seals at mutual distances along the longitudinal extension a multi-layer web of heat-sealable ma ψ material for the production of bags and for pulling the web, characterized by a pair of shafts arranged at a distance from each other) bearing devices for the shafts, which allow a displacement of the same towards and away from each other, a rotatable member on each of the shafts, devices for Rotating the rotatable members in opposite directions, at least one sealing element on each of the rotatable members in such an arrangement that rotation of the rotatable members in opposite directions brings the faces of an opposing pair of sealing members into abutment on one side of a plane through which Waves runs, and the web in between is pinched, the web is sealed and during said Rotation is continued while the sealing elements move to a predetermined point on the other Moving side of the said plane, resilient devices, which the shafts and rotatable members on each other to press so that a pressure between the adjacent Sealing elements is created, with the shafts and rotatable members during the movement of the corresponding Sealing elements moved away from each other from the initial contact with the web in said plane and - 31 109850/1288 ■ s then moved towards each other until the corresponding Sealing elements reach a predetermined position on the other side of said plane. 2. Apparatus according to claim 1, characterized in that each sealing element has a substantially flat end face and is pivotable on the associated rotatable member is hinged. 3. Apparatus according to claim 1, characterized in that the end face of each sealing element is arcuate. . H. Device according to claim 1, characterized by devices to change the distance between the transverse seals and consequently to change the length of the bags produced. 5. Apparatus according to claim 1, characterized by manually operable Adjustment means for changing the distance between the transverse seals and consequently to change the length of the bags produced. 6. Apparatus according to claim 1, characterized by stop devices for limiting the movement of the shafts and rotatable members towards each other and by adjusting devices for the location of the anchor devices, so that the minimum distance between the shafts during a The given work cycle is controlled and the length of the bags produced is regulated. - 32 109850/1288 7. The device according to claim 1, characterized by directions for automatic control of the distance between the transverse seals and the length of the manufactured bags with devices for obstruction or responsive to a marking on the web Interruption of the movement of the shafts towards each other, so that the corresponding sealing elements are in the process of being continued Separate rotation of the same and stop pulling the web. 8. Apparatus according to claim 1, characterized in that the resilient devices have a compressible pressure medium. 9. Apparatus according to claim 1, characterized in that the bearing devices for the displacement of the shafts a pivot device for each shaft, one connecting each shaft to the associated pivot device Arm, causing the shifting of the waves on an arc line about each pivot means, and connecting means between each of the pivot means and have the -federnden devices, so that a displacement of the Wellen.die pivoting devices and the Linking devices rotates and one rotation of pivoting devices causes a displacement of the shafts by moving the connecting devices. 10. The device according to claim 9, characterized by stop devices for limiting the movement of the shafts and rotatable members towards each other and by adjusting devices for the location of the anchorage devices, so that - 33 -1 0 9850/1288 the minimum distance between waves during a given work cycle is controlled and the length of the bags produced is regulated. 11. Device for producing transverse seals at mutual distances along the .longitudinal extension of a multi-layer web of heat-sealable material for the production of bags and for pulling the web, characterized by a pair of rotatable members, storage devices for the members to perform a rotation around the center, which towards each other. and are displaceable away from each other, means for rotating the members in opposite directions, at least one sealing element each , on each of the rotatable members in such an arrangement that rotation of the rotatable members in opposite directions causes the faces of an opposing pair of sealing members to be in abutment with one another Brings side of a plane which runs through said centers, and that the web is clamped therebetween, the web is sealed and pulled substantially in a straight line during said rotation * while the sealing elements are in a predetermined position on the other side 4 ^he said Moving plane and separating from one another, the organs moving away from one another during the movement of the respective sealing elements from the initial clamping position into said plane and moving towards one another after passing through said plane, resilient means, which normally are rotatable To burden organs on one another, and facilities for changing the position on the other side of the above-mentioned level on which the seal - 3 * 109850/1288 Separate elements so that the distance between the transverse seals and the length of the manufactured bag is controlled. 12. The device according to claim 11, characterized by actuating devices for setting the end faces of the opposing pair of sealing elements essentially parallel to each other before pinching the web between them. 13. The apparatus according to claim 11, characterized in that the latter devices comprise a control device which hinders or interrupts the movement of the rotatable members towards one another. IH. Device according to claim 11, characterized in that the latter devices have a manually adjustable control device which controls the movement of the rotatable organs towards each other interrupts. 15 ", device according to claim 11, characterized in that the latter means a pair of chambers in closed communication with one another, which contain a substantially fixed volume of a suitable fluid, means for varying the capacity each chamber as a function of the movement of the rotatable members towards and away from one another, whereby the fluid is displaced from one chamber in the other in one direction when the rotatable members are rotating move towards each other, and the fluid from the other chamber into one chamber in the opposite direction - 35 10 9 8 5 0/12 88 is displaced when the organs move away from each other, and responding to a mark on the pathway Means for controlling the displacement of the fluid in of said one direction so that the movement of the rotatable members is hindered or interrupted and a separation of the sealing elements is caused. 109850/1288