EP2276613B1 - Needle roller - Google Patents

Abstract

A device for production of bags that preferably consist mostly of paper includes a perforation device for cross perforation of a material web, a tube formation device for formation of a tube from the material web, a first separation device to separate individual tube sections, a device to form a bottom on one of the ends of the tube section, and a second separation device with which individual material sections can be torn off from the tube sections or bags.

Description

The invention relates to a needle roller for perforating or picking up material pieces or webs according to the preamble of claim 1 and to a method for perforating or picking up material pieces or webs according to the preamble of claim 8.

Needle rollers are often used to perforate webs of material, such as paper webs, from which pieces of tubing and ultimately sacks or bags are made. Such perforations are often created to vent such bags after filling can. The same applies to bags in which, for example, bread is packed. Here, the perforations produced in this way serve to remove the moisture. A device that incorporates such needle rollers is in EP 0 776 741 A1 described. Also printed products are often provided with perforations, as in the patent US 4,055,101 is disclosed.

However, needle rollers are also used for receiving pieces of material when it is necessary to remove a separated piece of material from the material flow. One application is the removal of so-called flaps, ie pieces of material, in the course of the production of paper bags from sheet-like paper.

All of these needle rollers are rotatable in the machine frame or other components that are held in place during operation (hereafter For the sake of simplicity, only "machine frame" will be mentioned). The peripheral speed is in some applications equal to the transport speed of the webs or pieces, in other applications, the peripheral speed of the needle roller may differ from the transport speed. The needle rollers may represent various embodiments. Common to all embodiments, however, is a needle roller body which can roll with its outer circumference on the material web.

Regardless of the application, the needles protrude beyond the outer surface of the needle roller body for piercing into the piece of material or into the material web.

A common problem with needle rollers is the release of the piece of material or the web after the piercing. When perforating, for example, of webs, the needles and the web to solve again, without the needles influence, for example, on the web tension. When removing a piece of material from the flow of material, the problem frequently arises that this piece of material must also be removed from the needle roller after it has been picked up, so that the needle roller can pick up a new piece of material during the next round.

The generic document JP 7-256596 shows such a needle roller in which the needle are retracted back into the needle roller body due to a spring force. The needles are thus for perforation and subsequent release of the perforated workpiece - here PET bottles - relative to the needle roller body displaced. In addition, individual needles are moved so that each is provided with a spring. Such a construction is complex and therefore expensive.

The object underlying the present invention is therefore to propose a simpler needle roller and a method in which or in which the needles and the piece of material or web can be separated from each other in a simple manner.

The object is achieved by a needle roller, which in addition to the features of the preamble of claim 1 also includes its characterizing features, and by a method according to claim 8.

Accordingly, the needle roller comprises a needle carrier (67) which carries needles (72, 72 ') or at least one needle bar (75), which (67) extends in a direction parallel to the axis of rotation of the needle roller (50) and which (67) a radial direction (R) of the needle roller (50) is movable, wherein the needle carrier (67) on at least one end face a guide cam (70), in or on which a roller (71) runs.

According to the invention, therefore, a needle carrier is provided which carries needles or the at least one needle bar. The needle carrier also advantageously extends parallel to the axis of rotation of the needle roller. The needle carrier is movable in the radial direction of the needle roller. It is advantageous in this case if the needle carrier can be moved on a cutting plane, which is spanned by the axis of rotation of the needle roller and a radial direction. The needle carrier can be guided by guides, in particular linear guide elements such as rails or sliding surfaces. If needles are arranged parallel to the guides on both sides of the needle carrier, one needle set can reach its peak, while the other set of needles can reach its lowest point, and vice versa. With such an embodiment of the needle roller so two pieces of material can be removed by the movement of only one assembly from the material flow.

Furthermore, the needle carrier on at least one of the end faces on a guide curve, in or on which runs off a roll. This roller is fixed relative to the machine frame during rotation of the needle roller so that rotation of the needle roller provides movement of the needle carrier relative to the needle roller body. Instead of the role, any, be provided with the same effect element. Advantageously, the guide curve is designed as a recess in the end face of the needle carrier. However, the roll can also roll on a control or guide curve, which is not or at least not arranged directly on the needle carrier.

In a needle roller according to the invention, the needles are partly or completely pulled back into the needle roller body after the material piece has been picked up, so that the material piece rests on the outer surface of the needle roller body and is completely or at least largely stripped off the needles by this surface. A piece of material that has been taken by the needle roller can now be collected in a waste container or removed by another means, such as a nipple. The needles are said to have returned to their original position in this process after a complete rotation of the needle roller. The effect of the device according to the invention is especially great when the needles are once fully drawn into the needle roller body during this revolution ("low point") and once their maximum position, ie the "high point" (maximum distance of the needle tips from the outer circumference of the needle roller body). achieved. It is also conceivable that the needles have twice reached the positions described in each round.

In an advantageous embodiment of the invention, at least one needle bar is provided, on which a plurality of needles are arranged. This needle bar then extends parallel to the axis of rotation of the needle roller. By a plurality of needles, it is more reliable possible to receive a piece of material without this unintentionally slides back from the needles. Now, if a needle bar is used, it is easily possible to move this plurality of needles relative to the needle roller body.

In a particularly advantageous embodiment of the invention it is provided that the at least one needle bar releasably fastened to the needle carrier is. This is to be provided in particular if two or more needle bars are provided on the needle carrier. In this case, one of the needle bars can be removed, so that only one piece of material is received per revolution of the needle roller. In the production of paper bags, this measure has an advantageous effect, because then bags of great length, such as those required for packaging Baguettebroten, can be produced. The needle bars may be screwed to the needle carrier. Other types of attachment are conceivable.

It is particularly advantageous if the guide curve has the shape of an ellipse. It is advantageous if the small semi-axis of the ellipse runs substantially perpendicular to the direction of movement of the needle carrier. In this elliptical shape, there are no major changes in the forces acting, so that the entire device is operated as low as possible wear. In combination of said elliptical shape of the guide curve with the guide direction of the needle carrier, the forces exerted by the roller and the guides not only act radially outwards but also radially inwards. If the latter were not the case, springs would have to be used, but their restoring force would be severely limited. The combination mentioned is therefore of great advantage.

In a preferred embodiment of the invention it is provided that the already mentioned roller is arranged on a block. This block can be a cylindrical body. This block is rotatable relative to the needle roller and relative to the machine frame. This axis of rotation of the block is aligned with the axis of rotation of the needle roller. It is advantageous if two such blocks are provided, one at each end. The block can even be twisted during operation of the needle roller.

Furthermore, it is advantageous if the axis of rotation of the roller is arranged parallel, but eccentric to the axis of rotation of the block. Now, if the block is rotated relative to the machine frame, so that the position of the roller relative to the machine frame can be changed. In this way, the Angular position of the high point and the low point are changed relative to the machine frame. Thus, the plunge angle or the immersion time of the needles can be set in the material, the same applies to the release time. This setting can be done even during operation of the needle roller. It is conceivable even an adjustment of the setting to the desired or current machine speed or to the rotational speed of the needle roller.

In a preferred embodiment of the invention, a motor, preferably an electric motor, is provided, with which said block is rotatable. If two blocks are provided, it is advantageous to couple them in a suitable manner, so that their rotation runs synchronously. This can be done for example via a geared shaft whose gears act on gears of the blocks.

Further advantageous embodiments of the invention will become apparent from the figures and the subject description.

Fig. 1

Seitenansicht einer ersten Ausführungsform einer Beutelmaschine, in der eine erfindungsgemäße Nadelwalze vorteilhaft einsetzbar ist,

Fig. 2

Seitenansicht einer zweiten Ausführungsform einer Beutelmaschine, in der eine erfindungsgemäße Nadelwalze vorteilhaft einsetzbar ist,

Fig.3

Detailansicht einer Abreißstation, in der eine erfindungsgemäße Nadelwalze vorteilhaft einsetzbar ist,

Fig. 4

Längsschnitt durch eine erfindungsgemäße Nadelwalze

Fig. 5

Ansicht V - V aus Fig. 4

Fig. 6

Nadelwalze aus Fig. 4, jedoch um 90 Grad gedreht

Fig. 7

Ansicht VII- VII aus Fig. 6

The individual figures show:

Fig. 1

Side view of a first embodiment of a bagging machine, in which a needle roller according to the invention can be used advantageously,

Fig. 2

Side view of a second embodiment of a bagging machine, in which a needle roller according to the invention can be used advantageously,

Figure 3

Detail view of a tear-off station, in which a needle roller according to the invention can be used advantageously,

Fig. 4

Longitudinal section through a needle roller according to the invention

Fig. 5

View V - V off Fig. 4

Fig. 6

Needle roller off Fig. 4 , but rotated 90 degrees

Fig. 7

View VII-VII off Fig. 6

Fig. 1 shows a device 1 for the production of bags. In this figure, the essential components of this device are shown schematically. The Device 1 comprises an unwinding device 2, to which a material web 3 in the form of a roll 4 is fed. Starting from this winding 4, the web 3 is guided by guide rollers 5 of the cross-cutting station 6 or perforating station 6. This station 6 comprises one or more cross-cutting or transverse perforating knives not shown in detail, which circulates on a roller 7. The web 3 runs in this station 6 via a counter-pressure roller 8, which has the main purpose to provide the necessary for the cutting or perforating counter pressure. In this cutting or perforating the web is not severed, but provided with weakening cuts or perforations, along which later breaks the tube to be formed for singulation in pieces of hose. The perforations for later tearing of the material sections are introduced in the described station 6 in the web. For this purpose, the roller 7 in certain areas on knives, which are arranged parallel to each other.

Subsequently, the material web 3 passes through a nip formed by a further guide roller 5 and a roller formed as a longitudinal glue 26. This applies glue on a side region of the material web 3, so that both side regions after the hose formation, which will be described below, permanently connected to each other.

In the following tube forming station 9, a tube 10 is formed from the material web 3, by the web 3 by means of guide elements, such as guide plates, taken laterally, so that overlap the edges of the web of material overlap. The subsequently overlapping regions were already provided by means of the longitudinal glue 26 with a suitable adhesive. During the wrapping of the paper web and gussets can be inserted. The insertion of the gussets can also be done after the hose formation. The tube 10 is now usually continued in the transport direction z.

After the tube 10 has been produced, this is singulated in the first tear-off 11 to pieces of tubing 12. For this, the tube 10 passed through the nip of a first pair of rollers 13. During the further advancement of the hose this passes into the nip of a second pair of rollers 14. The rollers of the second pair of rollers have constantly or at least temporarily a greater peripheral speed than the rollers of the first pair of rollers 13, the peripheral speed advantageously coincides with the transport speed of the tube 10. When the next perforation seen from the leading end of the tube has passed the nip of the first pair of rollers 13, the second pair of rollers 14 engage the tube 10. This can be done by entering the leading end of the tube in the nip of the second pair of rollers. However, the rollers of the second nip 14 can also be moved relative to the hose 10, for example vertically, and applied to the hose. When the rollers of the second nip 14 abut the hose, the hose breaks along the cut or perforation introduced into the web at station 6.

The piece of tubing 12 torn off from the tube now enters the floor gluing and floor folding station 15. For this purpose, the piece of tubing 12 is held on the floor maker cylinder 16. By a suitable element, for example by a rod, the forward-running tab of the tube piece, which is usually components of the underside and the top is above folded, folded, so that parts of the lower layer rests after folding on the outside of the upper layer. Previously, the tab and / or the region of the outer side of the upper layer on which the tab rests after folding over, provided with an adhesive, such as glue. Serves the glue applicator, which in the FIG. 1 symbolized by the glue cylinder 17.

After the bags have been completed so far, this passes through a second tear-off station 18. This tear-off station 18 is thus arranged downstream of the bottom maker cylinder 17. This station is basically constructed like the first tear-off station 11 and operates analogously. The distances between the two nips are set so that the nip of the roller pair 19 only the Detected material portion of the upper layer, which protrudes beyond the lower layer, while the roller pair 20 ensures an accelerated further transport of the bag. This material section is then removed by a needle roller according to the invention. After tearing off said material section of the bag is placed on a table 22 by means of a storage cylinder 21. The bags are usually arranged vertically standing from this table 22, the bags can then be removed in batches in a suitable manner.

The FIG. 2 shows again a device according to the FIG. 1 , In comparison to FIG. 1 now the rollers of the roller pairs 19 and 20 have been provided with reference numerals. The roller 50 of the roller pair 19 is designed as a needle roller, which in FIG. 3 is explained in more detail. The roller 51 is designed accordingly as a counter-pressure roller, which may include depressions into which the needles can dip. These depressions can be configured, for example, as boreholes or as grooves. Above the needle roller 50, a scraper device designed as a suction device is provided, which has the purpose of removing a material section received in the roller nip by the needle roller 50 from the needle roller 50 again.

The FIG. 3 shows enlarged the roller pairs 19 and 20 of the second tear-off 18. The roller 50 of the roller pair 19 is equipped with needles 55, two of which can be seen. These needles 55 are slidably mounted within the roller 50 and are moved out of the peripheral surface of the roller 50 just before or when they reach the counter-pressure roller 51. At this moment, the material section 38 should be detected. The tearing off of the material portion 38 is accomplished either by the retention by means of the needles 55 or by the material portion being held in the nip of the rollers 50 and 51, or by both. If, after further rotation of the roller 50, the material section has reached the region of the suction device 54, not shown here, the needles 55 can be retracted again within the body of the roller 50, so that the suction of the material section is facilitated. The extension and retraction the needles can be done for example by a guide surface, not shown. The needles may be spring-loaded, for example, so that they are in the basic position within the roll body. To extend the needle, these can then run over a guide surface, which is arranged so that the needles are pressed against the spring force to the outside. However, the needles can also be moved in another direction in the direction of the double arrow R, which indicates the radial direction of the roller 50. For example, controllable pneumatic cylinders are conceivable.

While needles 55 have engaged the material portion 38, the bag 39 is already in the nip between the rollers 52 and 53. The peripheral speed of these rollers is substantially equal to the transport speed with which the bags or pieces of tubing are transported through the apparatus. The circumferential speed of the rollers 50 and 51, at least in the period between the detection of the material portion 38 and the tearing off, is smaller than this transport speed, in order to allow the tearing in the first place. Since, however, the average rotational speed, ie the distance after a complete rotation of the roller 50 divided by the associated time, must be equal to the transport speed, the roller 50 must be nonuniformly, that is driven with non-uniform angular or peripheral speed. This can be done for example via a known non-uniformity gear or a separate servo motor.

The phase angle of the rollers 50 can be adjusted in the direction of the arrows φ and -φ in order to be able to process tube pieces or bags of different formats.

The FIG. 4 shows a preferred embodiment of a needle roller 50 and in particular the control of the displacement of the needles within this needle roller.

The needle roller 50 comprises first a cylinder body 60, which is designed as a hollow cylinder and at its end faces 61 each one central opening 62 has. Externally, another hollow cylinder 63 is attached to one end face. The cylinder body 60 and / or, as in the Fig. 4 is shown, the hollow cylinder 63 are rotatably supported by bearings 64 in the machine frame 25. At least one of the hollow cylinder 63 is acted upon by a drive with a torque. The drive may, for example, act on a toothed belt which transmits the drive torque to the hollow cylinder 63 by means of gears, which thus acts as a shaft. The hollow cylinder 63 may also be driven by its own motor. This drive arrangement can be gearless. As an example, the in FIG. 4 The electric motor 77 arranged on the machine frame drives a gear wheel 78, which meshes with the drive gear wheel 79, which is fastened to the hollow cylinder 63.

Another cylinder 65 penetrates both the hollow cylinder 63 and the central opening 62 and thus projects into the interior of the cylinder body 60. About the bearing 66, the hollow cylinder 63 can still be supported on the cylinder 65. This cylinder 65 can be fixed to non-illustrated parts of the machine frame 25, but can also be rotated relative to this. This Verdrehmlöglichkeit serves, as described below, the adjustment of the needles relative to the outer surface of the cylinder body 60th

In the cylinder body 60, a needle carrier 67 is slidably mounted in guides 68, so that it is displaceable in the direction of the double arrow R relative to the cylinder body 60 (see FIG. 5 ). The guides 68 are in the in the FIG. 5 shown embodiment of two plane-parallel planes, which represent slip planes for the needle carrier. But you can basically be designed differently for this purpose, as long as they allow the displacement of the needle carrier 67 in the direction of the double arrow R. The needle carrier 67 carries on each of its two side surfaces a needle bar 75, which in turn each carry a row of needles 72 which can pass through bores 73. The bores are introduced into a closure bar 88. This locking bar 88 provides an elevation 56 opposite the outer surface 74, which ensures that the material portion can be torn from the bag. In this case Needle roller and the platen roller 51 have no permanent contact and do not hold the material section firmly. However, as the elevation 56 passes the platen roller, the portion of material is firmly gripped and thereby torn off the bag while the portion is simultaneously received by the needles.

The closure bar 88 may be releasably secured to the cylinder body 60 by suitable fasteners such as screws. Also, the needle bars 75 can with screws 76 (see Fig. 6 ) may be attached to the needle carrier 67. Thus, the needle bar can be easily removed. The resulting recess of the outer surface 74 can now be closed by a cover, not shown. Needle roller 50 then operates with only one needle bar and removes only one section of material 38 per turn (usually two). Thus, the needle roller is adaptable to particularly long lengths of the bag 39.

At the end faces 69, the needle carrier 67 has elliptical recesses 70. In these elliptical recesses 70 engage rollers 71 which are fixed to the needle carrier 67 facing the end face of the cylinder 65, wherein the axis of rotation 87 of the roller 71 is not aligned with the axis of the cylinder 65, but is arranged eccentrically to this. The roller may be rotatably mounted on the cylinder 65.

So far in relation to the FIG. 4 only the first, right end of the needle roller 50 is described. The second, left end has an analog structure. However, here can be dispensed with facilities for applying the roller with a torque. The FIG. 6 shows the same roller 50 as the FIG. 4 , but further rotated by an angle of 90 °.

The function of the needle roller 50 can be determined by the FIGS. 5 and 7 be explained. In the home position, the upper needles 72, which are in the so-called "12 o'clock position", are completely recessed within the cylinder body 60. The lower needles 72 '("6 o'clock position"), on the other hand, are extended as far as possible and project beyond them Outside surface 74 of the cylinder body 60. In this position, the needles 72 'are able to take a material portion 38. Now, if the cylinder body 60 is rotated in accordance with the arrow D, so remains as described, the roller 71 in position. However, the elliptical recess 70 rolls with the edge surfaces on the roller 71. Since the needle carrier is not freely movable, but only in the direction of the arrow R is displaceable, the needle carrier 67 is acted upon by the action of the roller 71 on the edge surfaces of the elliptical recess 70 with a resultant constraining force, which points in the direction R.

The situation after a quarter turn (rotation by 90 °) is in the Fig. 7 shown. Now, the main axis of inertia of the needle carrier 67 is located on the axis of rotation of the cylinder body 67. Thus, the needles 72 and the needles 72 'protrude equidistant out of the cylinder body. In the further course of the rotation, the needles 72 'are pulled further and further into the cylinder body, so that a portion of material held by the needles 72' on the peripheral surface of the cylinder body is released again. The complete release of this material section takes place, for example, in the region of the suction device 54, not shown here, so that the material section can be reliably removed from the second separating station.

In order to be able to change the angular position in which the needles 72 or 72 'have extended as far as possible in the direction φ or -φ (see FIG. 3 ), now the cylinders 65, 65 'can be rotated relative to the machine frame. This is possible even during operation of the device according to the invention. With the rotation of the cylinder 65 and the axis of rotation 73 of the roller 71 is pivoted by the same angular amount, which has the consequence that also the position in which the needles 72 and 72 'are extended as far as possible, is changed by this angular amount. If, for example, the cylinder 65 is rotated counterclockwise by 30 degrees, the position in which the needles 72 or 72 'are extensible as far as possible is changed to the so-called 5 o'clock position. To rotate the cylinder 65 and 65 'is a drive 80, for example, a servo motor, is provided, via suitable

Holder 81 is fixed to the machine frame 25. The shaft 82 of the drive 80 carries a gear 83 which meshes with a drive gear 84 arranged on the cylinder 65. The drive gear 84 in turn drives another gear 85, this an actuating shaft 86 and the latter in turn a gear 85 'at. Gear 85 'meshes with the drive gear 84' which is secured to the cylinder 65 '. Now, if the cylinder 65 is moved over the said arrangement, so the synchronization arrangement (gears 85, 85 ', shaft 86) ensures that the drive gear 84' and thus the cylinder 65 'is equally adjusted. Said synchronization arrangement is shown only as an example, other types of arrangements are equally conceivable. In particular, can be dispensed with a motor adjustment for cost reasons and a manual adjustment by means of suitable hand wheels or levers are provided. LIST OF REFERENCE NUMBERS 1 Device for producing bags 2 unwinding 3 web 4 reel 5 guide roll 6 Cross-cutting station / perforating 7 roller 8th Backing roll 9 Tube formation station 10 tube 11 first tear-off station 12 hose Connector 13 first pair of rollers / pair of fixed rats 14 second pair of rollers / Abreißwalzenpaar 15 Floor gluing and folding station 16 Soil makers cylinder 17 Leimzytinder / folding blade 18 second tear-off station 19 roller pair 20 roller pair 21 storage cylinder 22 table 23 24 25 Machine frame of the second tear-off station 26 longitudinal gluing 27 28 29 30 31 32 32 ' 33 34 35 36 37 38 material section 39 bag 50 needle roller 51 Backing roll 52 pulling roller 53 Backing roll 54 suction 55 needles 56 increase 57 58 59 60 cylinder body 61 faces 62 central opening 63 hollow cylinder 64 camp 65, 65 ' cylinder 66 camp 67 needle carrier 68 guide 69 Front side of the needle carrier 67 70 elliptical recess 71 roll 72, 72 ' needles 73 drilling 74 outer surface 75 needle beam 76 screw 77 electric motor 78 gear 79 drive gear 80 drive 81 holder 82 wave 83 gear 84 drive gear 85, 85 ' another gear 86 actuating shaft 87 Rotary axis of the roller 71 88 closure beam Z Transport direction of the hose A suction direction φ circumferentially R Radial direction; Displacement direction of the needle carrier 67 D Direction of rotation of the cylinder body 60

Claims (8)

1. Needle roller (50) for perforating or accommodating pieces or webs of material, having a needle-roller body (60) and needles (72, 72') which, for the purpose of piercing into the piece of material (38'), project beyond the outer surface (74) of the needle-roller body (60),
   wherein the needle-roller body (60) is mounted in a rotatable manner in the machine framework (25),
   wherein the needles (72, 72') can be displaced relative to the needle-roller body (60),
   characterized by
   a needle carrier (67), which carries needles (72, 72') or at least one needle bar (75), which needle carrier (67) extends in a direction parallel to the axis of rotation of the needle roller (50) and which needle carrier (67) can be moved in a radial direction (R) of the needle roller (50), wherein the needle carrier (67) on at least one end side, has a guide curve (70), in or on which runs a roller (71).
2. Needle roller (50) according to Claim 1, characterized by
   the provision of at least one needle bar (75), which extends in the direction parallel to the axis of rotation of the needle roller (50) and on which a plurality of needles (72, 72') are arranged, wherein this needle bar (75) can be displaced relative to the needle-roller body (60).
3. Needle roller (50) according to one of the preceding claims,
   characterized in that
   the needle bar (75) can be fastened in a releasable manner on the needle carrier (67).
4. Needle roller (50) according to one of the preceding claims,
   characterized in that
   the guide curve is in the form of an ellipse (70), wherein the semiminor axis of the ellipse runs substantially at right angles to the movement direction (R) of the needle carrier (67).
5. Needle roller (50) according to one of the preceding claims,
   characterized in that
   the roller (71) is arranged on a block (65, 65'), wherein this block (65, 65') can be rotated relative to the needle roller (50) and relative to the machine framework (25), wherein the axis of rotation of the block (65, 65') is aligned with the axis of rotation of the needle roller (50).
6. Needle roller (50) according to the preceding claim,
   characterized in that
   the axis of rotation (87) of the roller (71) is arranged parallel but eccentrically in relation to the axis of rotation of the block (65, 65').
7. Needle roller (50) according to one of the two preceding claims,
   characterized by
   the provision of a motor (80), preferably of an electric motor, by means of which the block (65, 65') can be rotated.
8. Method of perforating or accommodating pieces or webs of material using a needle roller (50) having a needle-roller body (60) and needles (72, 72') which, for the purpose of piercing into the piece of material (38'), project beyond the outer surface (74) of the needle-roller body (60),
   wherein the needle-roller body (60) is rotated relative to the machine framework (25),
   wherein the needles (72, 72') are displaced relative to the needle-roller body (60),
   characterized in that
   a needle carrier (67), which carries needles (72, 72') or at least one needle bar (75), which needle carrier (67) extends in a direction parallel to the axis of rotation of the needle roller (50) and which needle carrier (67) is moved in a radial direction (R) of the needle roller (50), wherein the needle carrier (67) on at least one end side has a guide curve (70), in or on which runs a roller (71).

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