EP4028224A1

EP4028224A1 - Stamping machine for stamping labels and covers

Info

Publication number: EP4028224A1
Application number: EP20774902.9A
Authority: EP
Inventors: Markus Steiner; Mathias Schön; Claudia VISENTIN; Jürg THURNHERR
Original assignee: Berhalter AG
Current assignee: Berhalter AG
Priority date: 2019-09-10
Filing date: 2020-09-10
Publication date: 2022-07-20
Also published as: CN114786895A; US20220324130A1; KR20220059484A; BR112022004201A2; CA3150711A1; CH716574A1; CN114786895B; JP2022546743A; WO2021048259A1; AU2020347470A1

Abstract

The invention relates to a stamping machine for labels and covers comprising a servomotor as a driving element. The servomotor can be directly or indirectly connected to a spindle which causes the stamp to move forward in a linear manner.

Description

Punching machine for punching labels and lids

The subject of the invention is a punching machine for punching labels and lids according to the preamble of claim 1.

The invention also relates to a method for controlling the advance of the punch according to claim 24. The punching of labels and flat lids is known and takes place in different ways. On the one hand, the labels and lids, which consist of paper, cardboard, metal foils or laminated materials such as metal and plastic materials, can be produced by a punching process with a linearly driven punch or, on the other hand, between two rotating drums. The method described here comprises only the punching with a punch against a die and in particular the punching of labels and lids from starting material fed in endlessly in the form of a strip.

In known punching machines, the strip-shaped material is unwound or pulled off a coil and passed between the punch and the die. There are one or more labels at the same time per stroke punched out and after the punching process, the resulting punched grid of the supplied tape is pulled off and rolled up on a roller or vacuumed and chopped into small pieces. With the step-by-step advancement of the punching material and withdrawal of the punched grid, as well as with the drive of the punch, problems often occur in known punching machines which can lead to production interruptions or faulty punchings. Problems arise when the material to be stamped is fed in, in particular from elastic materials such as plastic films, since the same tensions do not exist in the edge zones of the material as in the center of the material, which means that creases can form when the material to be stamped, hereinafter referred to as film for short, is being transported . These different tensions at the edges and in the center of the film depend on the material used for the film and / or the width of the film and / or the shape and size of the diecuts, which means that, if at all possible, the properties at the beginning of a new application Adjustments to the film must be made on one or more of the interacting elements of the punching machine, which are time-consuming and require well-trained personnel.

The removal of the lead frame is difficult because the film is no longer full-surface, but rather through a large number of punchings has the shape of a grid, which can contract strongly when pulled transversely to the pulling direction and thus creates effects right into the punching tool. The formation of wrinkles is primarily caused by large elastic expansions in the

Edge areas and only minor elastic stretches in the middle of the full piece of tape material. The different expansions lead to a lateral constriction in the full piece of tape material and an associated wrinkling. The reason for the differences in expansion between the edge and middle areas in the full piece of strip material is that the punched grid with its holes locally interrupts the flow of force and typically transfers almost all of the belt tension in the edge areas. Due to the suction, which is often used as an extraction process, the lead frame contracts particularly strongly, depending on the size and shape of the punched-out lid. This can lead to the formation of folds within the punching tool or to geometrically irregular punchings. Furthermore, the lead frame can collide with the punch and / or other components during the advance through the punching tool. This leads to undesired production interruptions and causes time-consuming manual interventions by the staff. Both are costly and reduce productivity and possibly also the quality of the punched out labels or lids.

It has also proven to be disadvantageous that in known punching machines there is no flexibility with regard to the timing of the punching stroke. The punching tools, driven by an eccentric, can only be adjusted by hand and only when the machine is at a standstill with regard to the immersion depth. This means that when the material of the foil or even just the width of the foil is changed, the punching machine must always be manually adapted to the new conditions.

Today, the foil tape is mostly guided in the tool with so-called tape lifters. Such ribbon lifters have many unfavorable properties:

- The punches hit the tape lifters suddenly. This leads to a blow with considerable noise emissions at high cycle rates.

- Strap lifters are mounted on springs and therefore tend to oscillate or bounce.

- The tape lifters only guide the tape in one direction. Tape lifters only ensure a minimum distance between the tape and the die, but the distance between the tape and the punch is not influenced by the tape lifters.

- Tape lifters do not center the tape in the opening gap of the tool. Furthermore, the accessibility in the tool area is poorly solved in known machines. Either mechanical structures block access or the possible opening path of the lift and main drive is limited. The threading of the material strip and the cleaning of the tool area are correspondingly complex and uncomfortable. The poor accessibility is usually accompanied by a poor insight into the tool area. Problems with tape transport cannot be identified or can only be identified with difficulty.

Classically designed feed units do not achieve the required cycle rates or only pull the film in the edge area. Since the compression force between the two rollers can only be introduced at their ends, for even compression of the film, either the rollers must be made extremely rigid or they must be thickly rubberized. The inertia of such rollers is so high with the required bandwidths that the servo drive systems available on the market are too weak. Large servo drive systems do not solve the problem, as their own inertia increases to a great extent, so that there is no external increase in performance. One object of the present invention is to create a punching machine which enables perfect, uninterrupted punching and which In particular, a proper advance of the film to be punched to and in the punching device is guaranteed and then a proper removal of the unstable lead frame is guaranteed. In addition, the aim is to create the possibility of leading the lead frame through the punching device and also out of it again without interference.

Another task is to be able to set and adjust the time course of the punching stroke at any time, in particular the time course of the entry and exit

Immersion in the foil as well as the necessary punching forces to adapt to the foil to be processed.

Another object of the invention is to create a method with which the course of the punching stroke can be adapted to the properties of the film.

The object is achieved by the features of patent claims 1 and 24. Advantageous embodiments are described in the dependent claims.

The use of a servo motor to drive the punch directly instead of an eccentric drive enables not only the depth of immersion of the punch to be set, but in particular also the timing of the immersion and retraction of the

Punch as well as the holding time of the punch in the immersion phase. One connected to the servomotor or The spindle integrated in this enables an extremely precise temporal implementation of different feed speeds and progressions of the punching stroke.

The use of a servo motor and a spindle for the linear feed requires little maintenance. By mounting the spindle on a tool slide, exact positioning of the punch can be ensured.

The servo motor allows the time course of the punch from the rest position to the working position or its end after the immersion and cutting of the

Adjust the foil as required. In particular, a gentle start-up and a high feed rate can be generated until it hits the film and then shortly before or when the punch hits the surface of the film, depending on its physical surface

Properties of the speed curve can be changed almost at will until the end of the plunger immersion in the die. A short stop, for example before dipping into the film, is also possible. Another great advantage of using a servomotor is that the depth of immersion can also be changed, and in particular the speed when it hits the film, regardless of the thickness of the film. Compared to the prior art, where both the speed profile and the immersion depth are fixed, these parameters can be set and adjusted according to the invention using a touch panel. A backlash-free and precisely guided tool slide and a backlash-free, precisely guided moving tool part are rigidly screwed together in the new punching machine. The rigid connection of the two components creates a guide system with a large guide distance, which practically does not allow any deformation and thus ensures a uniform cutting gap between the punch and die (2-3 micrometers gap). The system of a tool slide with a rigid connection between the tool slide / tool and a free-flying tool is unique and offers great advantages in terms of accessibility in the tool area and a precise and stable guide system.

A slow start-up when switching on the main drive of the machine is no longer necessary. The first punching cycle can already be carried out at full working speed. Process fluctuations that vary as a result of speed influences are therefore virtually no longer present. The width of the feed device can be scaled as required, the compression of the belt remains constant regardless of this, as it does not depend on the bending stiffness of the drive rollers. In the preferred embodiment, the feed device comprises two interacting rotatably driven rollers with a jacket made of rubber or another covering having a high coefficient of friction. In at least one of the shafts of the rollers, which carry the jacket thereon, axially spaced apart magnets are used. These cause the contact pressure between the two interacting rollers to be constant over their entire length, ie between the bearing points, so that the film can be fed to the punching device without slippage at an exactly predetermined speed.

Because the magnets are arranged stationary on the shaft at a distance from the axis of rotation of the rollers, the distance to the opposite shaft or a ferromagnetic core located in the opposite shaft can be adjusted and / or adjusted the force of attraction and thus the surface pressure of the two rollers by rotating the shaft can be set.

At the ends of the tubes that form the jackets, toothed wheels are attached, over which a toothed belt, preferably a toothed belt with teeth attached on both sides, rotates. Due to the partial wrapping of the two gears at the same time, they are driven at exactly the same peripheral speed. This increases the accuracy of the advance of the film and, in particular, a distortion-free advance over the entire width of the

Foil. The pairs of drivable conveyor rollers on the base plate of the punching device that are opposite each other hold and convey the film within the punching device always transversely to the transport direction and in

Tensioned transport direction. With these two pairs of rollers, the film and, after the punching stroke, the lead frame are always kept at the original width of the film, which prevents the formation of waves and possibly entanglement of the webs of the punched film with parts of the punching device. Two pairs of conveyor rollers can each be rotatably mounted in a common axis or the axially opposite pairs of conveyor rollers are arranged at a slightly acute angle so that they always pull and tension the film outwards during transport.

The bearing housings of the conveyor rollers can be raised or lowered perpendicular to the base plate in order to increase the distance between the foil and later the lead frame to the die and the punch and thus additionally prevent the lead frame from getting caught in the punching device when it is pulled away from the punching device . The linear guides with roller cages are preferably mounted so as to be vertically displaceable. By arranging the pairs of conveyor rollers at the corners of a rectangle, the foil and the lead frame always remain in the original shape of the foil fed in. A first deflecting roller is mounted so that it can be displaced essentially perpendicular to the transport direction between a second pair of take-off rollers arranged following the punching device, seen in the working direction, which, like the first pair of take-off rollers, can be formed in front of the punching device. The amount of the respective shift due to voltage changes or changes in conveyor speed is measured by a position encoder. With this the

The take-off speed can be regulated in order to guide the latter taut on the entire transport path of the film and then the lead frame.

The pulleys, over which the lead frame is guided after the punching process, are mounted in bearing blocks which are mutually displaceable on guide profiles in order to adapt the clamping gap to the thickness of the foil or lead frame. The invention is explained in more detail below using an illustrated exemplary embodiment. Show it:

Figure 1 is a schematic side view of a

Punching machine, Figure 2 is a plan view of the main drive,

Figure 3 is a perspective view of the

Main drive, FIG. 4 shows a plan view of the tool slide for the punching tool,

Figure 5 is a perspective view of a stationary shaft with magnets for the rollers of the feed,

Figure 6 shows the stationary shaft with bearing rings attached,

FIG. 7 shows two rollers arranged on a bearing block with a film passed between the rollers,

Figure 8 the two rollers and the bearing block, additionally equipped with two

Drive motors, drive timing belts and

Shaft bearings, Figure 9 is a schematic side view of Figure 7, Figure 10 is a front view of Figure 8, Figure 11 is a perspective plan view of the base plate with an inserted die and film drive arranged on the base plate,

FIG. 12 a vertical section with a top view of the lead frame drive with the conveyor rollers,

Figure 13 is a plan view of the lead frame drive, Figure 14 is a perspective view of the lead frame drive,

FIG. 15 a side view of the film drive, FIG. 16 a perspective bottom view of the film drive,

FIG. 17 a side view of the lead frame rocker, FIG. 18 a front view of the lead frame rocker in FIG. 17,

Figure 19 is a plan view of the lead frame rocker, Figure 20 is a perspective view of the lead frame rocker,

FIG. 21 a side view of a further lead frame rocker,

FIG. 22 a front view of the lead frame rocker in FIG. 21

FIG. 23 shows a top view of the lead frame rocker according to FIG. 21 and FIG. 24 shows a perspective illustration of the lead frame rocker obliquely from above.

In the schematic side view of a punching machine 1 for punching labels and lids for containers such as bottles, cans, cups and deep-drawn trays made of plastic or aluminum, reference numeral 3 denotes a side plate which is part of a machine frame. The essential elements of the punching machine 1 include a main drive 7 with a servomotor 9, a spindle 11, a guide element such as a tool slide which guides the punch 13 linearly in the direction of a die 57 on a base plate 15 Feed device 17 for a film 19 as a strip-shaped punching material, which can be pulled off a coil 21, which serves as a strip storage device, a punched grid drive 23, which is mounted in the punching tool, and a dancer element in the form of a punched grid rocker 25.

The punching material, hereinafter referred to as film 19 for short, is fed to punching machine 1 from a coil 21. The film 19 is pulled off the coil 21 with the feed device 17, which can be preceded by a dancer (FIGS. 5 to 10).

The feed device 17 comprises two rollers 29 arranged on parallel axes, which preferably have a rubber coating or jacket 41 on their periphery, which ensures a slip-free feed of the film 19. At least one of the two rollers 29 can be driven by a drive motor 53. Both rollers 29 are preferably driven synchronously. The two rollers 29 comprise a shaft 37 on which a plurality of axially parallel arranged in a row

Magnets 33 are arranged in bores 35 extending radially to the axis. The magnets 33 can also be attached to the surface of the shaft 37. The shaft 37 can have a round or rectangular cross section. Distributed over the axial length of the shaft 37, bearing rings 39 are rotatably arranged between the magnets 33 on the shaft 37. The inner race of the bearing rings 39 is rotatably connected to the shaft 33. The outer bearing ring 39 carries a tube 38 which forms the rubber jacket.

The shaft 37 forms the core for the tube 38 with the rubber jacket 41. At the two ends of the shaft 37, gears 43 are attached to the tube 38 at the ends of the tube 38 in a rotationally fixed manner. Two such rollers 29 designed in this way are supported at their ends by a bearing block 45 (FIG. 10).

On the end of the bearing blocks 45, first shaft bearings 47 are fixedly connected to the bearing blocks 45. Two displaceable second shaft bearings fastened on guide rods 49 to the first shaft bearings 47 carry the second roller 29.

The two rollers 29 with toothed belts 55 are driven in opposite directions by one or more drive motors 53. The toothed belt or belts 55 loop around the toothed wheels 43 on the two rollers 29. The toothed wheel or wheels 47 on the other roller 29 are driven synchronously by the external teeth of the toothed belts 55. In other words, the two rollers 29 can be driven exactly electronically in synchronism with the same peripheral speeds.

The rollers 29, which are thin in relation to their axial length, are driven by the non-co-rotating shafts 37 arranged in their center or by the shafts 37 arranged thereon

Electro or permanent magnets 33 are mutually attracted. In this way, over the entire axial length achieve a uniform, mutual pressing of the peripheries of the rubber jackets 41. This uniform, mutual attraction of the rollers 29 extending over the entire axial length is retained, regardless of the thickness of the film 19, which is passed between the two rollers 29 and conveyed. The change in the center distance between the two rollers 29 due to foils 19 of different thicknesses is absorbed by shifting one of the rollers 29 on the guides 49 on which the second shaft bearing is mounted so as to be radially displaceable.

The power of mutual attraction can be adjusted. For this purpose, the shafts 37 are attached to the bearing block 45 so that they can rotate through a certain angle of rotation, so that the radial distance between the magnets 33 on the shafts 37 can be adjusted. If the magnets 33 lie opposite one another on the two shafts 37 exactly between the axes of rotation of the rollers 29, then there is the greatest force of attraction; if they are rotated by a few degrees, the mutual attraction decreases accordingly.

In a simpler embodiment of the shafts 37, only one of the two shafts 37 is equipped with magnets 33.

The second shaft 37, not equipped with magnets 33, is then made of a ferromagnetic material. The rotation angle adjustment on the shafts 37 can take place by engaging the front end of the shafts 37. The film 19 drawn off from the coil 21 by the feed apparatus 17 then passes into the punching device 5, ie between the punch 13 and the base plate 15 with a die 57 (FIG. 11). Punched grid drives 59 between the punch 13 and the die 57 for guiding the film 19 in the punching device 5 each include a bearing housing 61 outside the punching device, inside a gearbox which has conveyor rollers 63 protruding from the housing 61 at the front and having parallel axes of rotation (Fig. 12 to 15). Furthermore, it can be seen from Figure 16 that the housing 61 with the

Conveyor rollers 63 are mounted vertically displaceably in a guide bore which is formed vertically in the base plate 15. The low-friction displaceability of the housing 61 and thus of the film drive 59 is ensured by ball cages 64. A drive motor 65 is also arranged on the bearing housing 61.

As can also be seen from Figure 11, the film drives 59 are arranged in pairs outside the circumference of the die 57, in such a way that the

Conveyor rollers 63 in the longitudinal edge region of the strip-shaped film 19 this input side and output side during the The punching process can be clamped and tensioned in the base plate 15 and then transported. The film 19 is consequently held by four pairs of conveyor rollers 63 during the punching process, on the one hand when the film 19 is stationary and on the other hand when it is being transported. As a result, it cannot contract lengthways, crossways or diagonally. The lead frame produced after the punching is consequently always kept taut when the film 19 is moved out of the punching area. Even if the greater part of the

Area of the strip-shaped film 19 is punched out of this and only narrow webs remain, which no longer have a stable connection, the punched grid can be guided out of the punched area without the lateral edges of the previously unpunched film 19 contracting and those within the punched grid remaining webs in the punching device 5 can get stuck. The film drive 59 is inevitably very miniaturized, since it is between the base plate 15 with the die 57 and the

Punch 13 comes to rest. The film drive 59 with its conveyor rollers 63 transports the film 19 step-by-step between these elements.

In order to be able to maintain the tension on the edges of the film 19, in particular in the case of films 19 made of a relatively elastic material, the axes of the conveyor rollers 63 can be slightly inclined, see above that they always pull the film 19 outwards and thus keep the film 19 taut between the conveyor rollers 63 and noticeably minimize the formation of waves or wrinkles in the material. As a result, interruptions in production can largely be avoided.

The vertically displaceable mounting and guidance of the film drives 59, made possible by the linear guides 81 led out of the bearing housing 61 from below and axially displaceably mounted in the base plate 15, allows the film drives 59 to move vertically from the die 57 while the film 19 is being advanced lifted off and, when the punching device 5 is closed, brought up to the die 57 again and brought into contact there. This play of the foil 19 during the advance between the underside of the foil 19 and the surface of the die 57 further promotes low-friction transport of the foil 19 when it is inserted into the punching device 5 and, on the other hand, the safe removal of the lead frame from the punching device 5 during the advance of the foil 19th

The punched grid led out of the punching device 5 now reaches the area of a punched grid rocker 25, generally also called a dancer or dancer device, via a second deflection roller 73 (FIGS. 17 to 20). The punched grid rocker 25 of the first embodiment (Figs. 17-20) comprises a first deflecting roller 71 which can be displaced axially parallel to the second deflecting roller 73 by means of a pneumatic cylinder 69 or a spring element.The ends of the first deflecting roller 71 are in bearing blocks 75 on horizontally arranged guide profiles 77 mounted so that it can slide in parallel. A pair of take-off rollers 79 with two interacting take-off rollers 80, the axes of rotation of which run parallel to the axes of rotation of the first 71 and second deflection roller 73, are arranged below the first deflection roller 71. The rollers 80 of the pair of take-off rollers 79 can be driven by a drive (not shown). The structure of the pair of take-off rollers 79 can correspond to that of the feed device 17 for pulling the film 19 from the coil 21.

The elements of the lead frame rocker 25 are arranged on a common, modular rocker frame.

The lead frame rocker 25 also includes a position transmitter 67, with which the position of the first

Deflection roller 71 is measured. The first deflection roller 71 and the second deflection roller 73 and the rollers 80 of the pair of take-off rollers 79 as well as the guide profiles 77 and the position sensor 67 are mounted on a frame, not shown, which can be connected to the side plate 3 and / or the machine foundation, not shown. Another particularly advantageous embodiment of the lead frame rocker 25 is shown in FIGS. 21-24. Two swivel arms 99 are articulated on one of two rocker cheeks 97 arranged at a distance from one another in parallel. The pivot arms 99 are at one end on the cheeks 97 of the

Rocker frame and can be adjusted with a spring element, e.g. a pneumatic cylinder, relative to the cheeks 99 of the rocker cheeks 97 so that the angle between the cheeks 97 with respect to a mounting plate of the rocker frame is adjustable. The first deflection roller 71 is inserted between the ends of the pivot arms 99, which are opposite the pivot axis A, which guides the punched grid from the punching device, consequently the second deflection roller 73, over the first deflection roller 71 and from there to the take-off roller pair 79.

As in the first exemplary embodiment, the film 19 is consequently deflected between the pair of take-off rollers 99 and the second deflection roller 73 arranged above it, so that disturbances due to uneven tensions in the

The film web in the film feed and in the film withdrawal can be compensated for by pivoting the pivot arms 99 with the first deflection roller 71 attached thereto. The punched grid rocker 25 consequently serves to ensure that the punched grid is gradually or continuously as parallel as possible up to the pair of take-off rollers 79, the second Forms feed apparatus, is transported through the punching device 5. The integrated position monitoring by the position transmitter 67 of the movable first deflection roller 71 is used to regulate the speed of the pair of take-off rollers 79. The scheme of

Withdrawal speed ensures that despite the distortion of the lead frame, be it in a positive or negative sense, the slippage in the feed units, position errors in the feed units or different roller diameters on the feed units (rubber wear) is compensated and consequently always between the first feed unit 17 and the pair of take-off rollers 79 the film 19 or the lead frame is always stretched and guided free of folds.

After the pair of take-off rollers 79, the lead frame can be suctioned off; but it can also be rolled up on a sleeve for removal and disposal. The main drive 7 shown in FIGS. 2 to 4 is used for punching the film 19 in the punching device 5, ie between the punch 13 and the die on the base plate 15 Spindle 11 (spindle only partially visible in Figure 2) be connected. The spindle 11 is rotatably mounted in a spindle housing 91 and drives a Fastening plate 93 for the punch 13 on. The fastening plate 93 is guided in a tool slide 95 in the axial direction to the spindle 11. The force acting on the spindle 11 during the punching stroke is transmitted from the spindle housing 91 to the side plate 3.

The servomotor 9 is connected to the machine control (control not shown). The punch stroke parameters, namely the immersion depth, i.e. the maximum stroke of the punch and the minimum stroke of the

Stamp and the accelerations or decelerations during the punching stroke and, if desired, reversal or stopping points between the end points of the punch generated. These possible variations of the curve traversed by the punch 13 during the punching stroke can be generated electronically and also set and / or changed at any time. This enables an adaptation to the materials of which the film 19 is made, but also to their mechanical properties such as hardness, elasticity and their respective thickness, without mechanical intervention in the machine when the thickness of the processed film 19 is changed is. For example, a relatively soft film 19 can initially be compressed somewhat and only then can the punching process be carried out. Furthermore, the return stroke, that is to say the retraction of the punch 13, can also take place at a suitable variable speed and / or a variable retraction curve.

Claims

1. A punching machine for punching labels and lids for containers made of paper, plastic, metal or laminates made therefrom from tape-shaped supplied tape-shaped film, comprising: a feed device (17) for transporting the film from a coil (21) to a punching tool, - the Punching tool with a punch, a die on a base plate

(15) with guides for the punch during the stroke movements and a drive element for generating the stroke movement of the punch and - a pull-off device for pulling the punched grid out of the punching device and for feeding the punched grid to a punched grid receptacle, characterized in that the drive element is used to generate a Linear movement of the punch (13) a servomotor (9) with a

Comprises spindle (11) and that the spindle (11) is connected to a tool slide (95) which carries and guides the punch (13).

2. Punching machine according to claim 1, characterized in that the spindle (11) is connected to the servomotor (9) by a coupling (87).

3. Punching machine according to claim 1, characterized in that the spindle is part of the servo motor (9).

4. Punching machine according to one of claims 1 to 3, comprising - a coil (21) as a band storage for the film to be punched,

- an electrically drivable feed device (17) for pulling the tape-shaped film from the tape store and for feeding the film (19) to a punching device (5), characterized in that the feed device comprises a feed device (17) with two interacting rotatably driven rollers (29) comprises that the rollers (29) have a jacket made of rubber (41) arranged on a tube (38), that the tubes (38) supported by bearing rings (39) are rotatably mounted on a shaft (37) that on the shafts (37) magnets (33) arranged parallel to their axes are fastened, which magnets attract the rollers (29) to one another over their axial length through mutual attractive forces.

5. Punching machine according to claim 4, characterized in that the magnets (33) spaced from the axis of rotation of the roller (29) are attached to the shafts (37) and that the shafts (37) are designed to be rotatable and adjustable about their axes in order to the mutual

To make the distance between the magnets (33) on the two rollers (29) adjustable.

6. Punching machine according to one of claims 4 or 5, characterized in that on one or both

At the ends of the tubes (38) of the two rollers (29) a toothed wheel (43) is attached, which is at least partially wrapped by one or two toothed belts (55), the toothed belt (55) being drivable by a drive motor (53).

7. Punching machine according to claim 8, characterized in that the toothed belt (55) has teeth on both sides when it partially wraps around and drives the two gears (43) on the two rollers (29) at the same time.

8. Punching machine according to claim 1, characterized in that on the base plate (15) of the die (57) in pairs opposite to each other drivable conveyor roller pairs (63) arranged and overhung the base plate (15) arranged bearing housings (61) are mounted.

9. Punching machine according to claim 8, characterized in that the bearing housing (61) are mounted perpendicular to the surface of the base plate (15) so that they can be raised and lowered.

10. Punching machine according to claim 9, characterized in that on the underside of the bearing housing (61) linear guides (81) are attached with which the

Bearing housing (81) are vertically displaceable in bores in the base plate (15).

11. Punching machine according to claim 10, characterized in that the linear guides (81)

Roller cages are used.

12. Punching machine according to one of claims 9 to 11, characterized in that the axes of rotation of the opposing pairs of conveyor rollers (63) run coaxially.

13. Punching machine according to claim 11, characterized in that the axes of rotation of the opposing pairs of conveyor rollers (63) are arranged to run at an acute angle to one another.

14. Punching machine according to one of claims 8 to 13, characterized in that two pairs of conveyor rollers (63) are arranged on the base plate (15) twice, arranged in a rectangle.

15. A punching machine according to claim 1, characterized in that a punched grid rocker (25) is used between the punching device (5) and the pair of take-off rollers (79) and comprises a first deflection roller (71) as a dancer for deflecting the incoming film (19) that a second deflection roller (73) is arranged between the punching device (5) and the first deflection roller (71) and that the first deflection roller (71) is mounted displaceably parallel to its axis of rotation.

16. Punching machine according to claim 15, characterized in that the ends of the first deflection roller (71) are slidably mounted on guide rails (89) or on the ends of pivot arms (99)

Arch sections can be moved axially parallel.

17. Punching machine according to one of claims 15 or 169, characterized in that the first deflection roller (71) by spring elements, spring assemblies or

Pneumatic cylinder (69) is held axially parallel and resiliently displaceable.

18. Punching machine according to one of claims 15 to 17, characterized in that the position of the first deflection roller (7) with respect to the take-off roller (80) can be measured and adjusted with a position transmitter (67).

19. Punching machine according to one of claims 15 to 18, characterized in that the first deflection roller (71) is mounted at both ends in bearing blocks (75) and that the bearing blocks are arranged displaceably in parallel on guide profiles (77).

20. Punching machine according to one of claims 16 to 18, characterized in that the swivel arms (99) can be swiveled by spring elements, spring assemblies or pneumatic cylinders (69) and their position is adjustable.

21. Method for controlling the punching stroke in one

Punching machine for punching labels and lids from a film for containers, in which a punch (11) performs stroke movements and during the feed stroke the punch (11) penetrates the film and cuts it and then returns to the starting position on the return stroke, characterized in that the stroke movements during the working and return strokes can be changed in terms of distance and time depending on the thickness and the properties of the processed film.