Die-cutting machine for labels and lids

Abstract

The punching machine for punching labels and lids has a servo motor as a drive mechanism, which can be directly or indirectly coupled to a spindle that generates the linear propulsion of the punch.

Description

[Technical Field]

[0001] The subject of the invention is a die-cutting machine for stamping out labels and lids according to the preamble of claim 1.

[0002] The subject of the invention is also a method for controlling the feed of a punch according to claim 24. [Background technology]

[0003] The punching of labels and flat lids is known and is carried out in various ways. On the one hand, labels and lids made of laminated materials such as paper, cardboard, metal film or 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 involves punching with a punch against a die, in particular punching of labels and lids from an initial material that is continuously supplied in the form of a strip.

[0004] In known die-cutting machines, a strip of material is unwound or drawn from a coil and passed between a punch and a die, where one or more labels are punched simultaneously with each stroke, and after the die-cutting process, the resulting die-cut grid on the supplied strip is drawn off, wound up or sucked onto rollers, and chopped into small pieces.

[0005] During the stepwise feeding of the punching material and the withdrawal of the punching grid and the actuation of the punching punches, problems often arise in the known punching machines which can result in interruptions in production or defective punched products.

[0006] Problems arise especially when feeding punched material made of elastic material such as plastic film, because the edge zone of the punched material does not have the same tension as the center of the punched material, which results in wrinkles occurring when the punched material - hereinafter simply referred to as film - is transported. These different tensions at the edge and center of the film depend on the material used and / or the width of the film and / or the shape and size of the punched product, which means that, if possible, adjustments adapted to the film's properties must be made in one or more of the cooperating elements of the punching machine at the start of the new directive, but these adjustments are time-consuming and require well-trained personnel.

[0007] Drawing punched grids is difficult because the film is no longer entirely drawn but has a grid shape due to the multiple punches. This grid shrinks significantly during drawing transversely to the drawing direction, thereby creating impacts within the punching tool. Wrinkle formation is primarily caused by large elastic strains at the edge regions of the complete strip material and small elastic strains at the center. The differential strains cause lateral shrinkage in the complete strip material and the associated formation of wrinkles. The difference in strain between the edge and center regions within the complete strip material is due to the punched grid locally interrupting the flow of force through its holes, typically transferring almost all of the strip tension to the edge regions. Due to suction, which is often used as a drawing method, punched grids shrink significantly, depending on the size and shape of the punched lid. This can lead to wrinkle formation within the punching tool or geometrically irregular punched products. Furthermore, punched grids can collide with punches and / or other components during feeding through the punching tool. This causes undesirable interruptions in production and requires time-consuming manual intervention by personnel, both of which are costly and reduce productivity and possibly the quality of the die-cut labels or closures.

[0008] Furthermore, it has been found to be a disadvantage that the known punching machines do not allow flexibility in the time course of the punching stroke. The punching tools, which are driven by eccentrics, can only be adjusted in terms of the penetration depth by hand and only while the machine is stationary. This means that when changing the film material or just the film width, the punching machine must always be manually adapted to the new conditions.

[0009] Film strips are nowadays mostly guided in tools by so-called strip lifters. Such strip lifters have a number of disadvantageous properties: The blanking punch suddenly impacts the strip lifter, which causes an impact with significant noise emissions at high cycle rates. The strip lifter is supported on springs and is therefore prone to oscillatory or bouncing movements. The strip lifter only guides the strip in one direction. The strip lifter only guarantees a minimum distance between the strip and the die, but the distance between the strip and the punch is not affected by the strip lifter. The strip lifter does not align the strip within the tool opening gap.

[0010] Furthermore, the accessibility to the tool area in known machines is not adequately addressed. Either the mechanical structure blocks accessibility or the possible opening paths of the stroke main drive are limited. Threading the material strip and cleaning the tool area is correspondingly complicated and unpleasant. Poor accessibility often results in poor visibility into the tool area. Therefore, problems during strip transport can only be detected with difficulty or not at all.

[0011] Classically designed feed units either do not achieve the required number of cycles or only pull the film in the edge area. Since the compression force between the rollers can only be introduced at their ends, uniform compression of the film requires the rollers to be either very rigid or to be heavily rubberized. The mass inertia of such rollers is high for the required strip width, making commercially available servo drive systems too weak. A large servo drive system does not solve the problem, since its own inertia increases to the point where it cannot generate an external power increase. Summary of the Invention [Problem to be solved by the invention]

[0012] The object of the present invention is to provide a punching machine that allows for uninterrupted and perfect punching, in particular ensuring perfect feeding of the film to be punched into and through the punching device and then perfect removal of the unstable punching grid. Furthermore, it should be possible to feed the punching grid through the punching device without any problems and then remove it again from the punching device.

[0013] Another object is to be able to set and adjust the time course of the punching stroke at any time, in particular to adapt the time course of the entry and exit from the film and the necessary punching force to the film to be processed.

[0014] Another object of the invention is to provide a method that allows the course of the punching stroke to be adapted to the characteristics of the fill. [Means for solving the problem]

[0015] The problem is solved by the features of claims 1 and 24. Advantageous configurations are set out in the dependent claims.

[0016] The use of a servo motor for direct drive instead of an eccentric drive makes it possible not only to adjust the penetration depth of the punch, but also, in particular, the time course of the punch's entry and return and the holding time of the punch during the entry phase. A spindle connected to or integrated in a servo motor allows the most accurate realization of different feed rates and feed courses of the punching stroke.

[0017] The use of a servo motor and spindle for linear feed is low maintenance. By mounting the spindle on the tool carriage, accurate positioning of the punch can be ensured.

[0018] The servo motor allows for the time lapse of the punch from its rest position to its working position or end after the film has penetrated and been cut to be freely adjusted. In particular, a gentle start and a high feed rate until impact with the film can be generated, and then, just before or when the punch reaches the film surface, the speed lapse until the end of the punch's penetration into the die can be almost freely changed depending on the physical properties of the film. For example, a short stop before penetrating the film is also possible. Another major advantage of using a servo motor is that the penetration depth can also be varied, and in particular the speed at which the punch impacts the film can be varied independently of the film thickness.

[0019] In contrast to the prior art, where both the speed profile and the penetration depth are fixed, these parameters can be set and adjusted in accordance with the present invention via a touch panel.

[0020] The precisely guided tool carriage without play and the movable tool part, also precisely guided without play, are rigidly screwed together in the new punching machines. The rigid connection of the two parts results in a guide system with a large guide gap, which practically does not allow deformations and thus guarantees an even cutting gap between the punch and die (a gap of 2-3 microns).

[0021] The system of tool carriage with a fixed tool carriage / tool ​​connection and a movable tool is unique and offers great advantages in terms of accessibility to the tool area and a precise and stable guiding system.

[0022] A slow start-up when switching on the machine's main drive is no longer necessary. The first punching cycle can already be carried out at full operating speed. Speed-dependent process variations therefore practically no longer exist. The feed unit can be scaled to any width, and the strip compression remains constant regardless, since it does not depend on the bending stiffness of the drive rollers.

[0023] In a preferred configuration, the feeding device has two rotatably driven cooperating rollers with rubber covers or other linings with a high coefficient of friction. Axial spaced magnets are inserted into at least one of the roller shafts, on which the covers are supported. This ensures that the pressure between the cooperating rollers is constant over its entire length, i.e., between the bearing points, so that the film can be fed to the die-cutting device at an accurately preset speed without slippage.

[0024] The magnets are fixedly arranged on the shafts at a distance from the rotation axis of the rollers, so that the rotation of the shafts allows the spacing and attractive force to the opposing shaft or to the ferromagnetic core arranged in the opposing shaft, and therefore the surface pressure of both rollers, to be adjusted and / or set.

[0025] Gears are fixed to the ends of the tubes that make up the cover, and a toothed belt, preferably one with teeth on both sides, rotates through these gears. By partially wrapping around both gears at the same time, these gears are driven at exactly the same peripheral speed. This improves the accuracy of the film feeding, and in particular allows for distortion-free feeding across the entire width of the film.

[0026] A pair of opposing, drivable conveying rollers on the base plate of the punching device holds and conveys the film through the punching device under tension, always transverse to the conveying device and in the conveying direction. These paired rollers ensure that the film, and after the punching stroke, the punched grid, is always held in its original width, thereby preventing the formation of waves and, potentially, the web of punched film from getting caught on parts of the punching device. Each of the two conveying roller pairs can be rotatably mounted on a common shaft, or the axially opposing conveying roller pairs can be arranged at a slightly acute angle, so that they always pull the film outward and apply tension during conveyance.

[0027] To increase the distance of the film and the subsequent punching grid from the die and punch, and thereby additionally prevent the punching grid from getting caught in the punching device when removed from the punching device, the bearing housing of the transport roller can be vertically raised and lowered relative to the base plate. Preferably, the linear guide is supported vertically movably by a roller cage. By arranging the transport roller pairs at the corners of a rectangle, the film and the punching grid always remain in the original shape of the supplied film.

[0028] Between a second pair of pull-out rollers arranged next to the punching device in the working direction and configured similarly to the first pair of pull-out rollers before the punching device, the first deflection roller is supported so as to be movable substantially perpendicular to the conveying direction. The amount of movement due to the change in tension or the change in conveying speed is measured by a position sensor. This position sensor makes it possible to control the pull-out speed in order to tension and guide the film, and subsequently the punching grid, over the entire conveying path.

[0029] The deflection rollers which guide the punched grid after the punching process are mounted in bearing blocks which can be moved relative to one another on guide profiles in order to adapt the clamping gap to the thickness of the film or punched grid.

[0030] The invention will be explained in more detail below by means of illustrative examples. [Brief explanation of the drawings]

[0031] [Figure 1] Schematic side view of the punching machine [Figure 2] Plan view of the main drive unit [Figure 3] Perspective view of the main drive unit [Figure 4] Plan view of a tool carriage for a punching tool [Figure 5] Perspective view of a fixed shaft with magnets for the feed rollers [Figure 6] Fixed shaft with bearing ring [Figure 7] Two rollers mounted on bearing blocks with the film threaded between them [Figure 8] Additionally, a drive motor, a drive toothed belt and two roller and bearing blocks with shaft bearings. [Figure 9] Schematic side view of Figure 7 [Figure 10] Front view of Figure 8 [Figure 11] A perspective plan view of a base plate with a die inserted therein and a film drive unit disposed on the base plate. [Figure 12] Vertical section including a plan view of the punched grid drive with transport rollers [Figure 13] Plan view of punched grid drive unit [Figure 14] Perspective view of punched grid drive unit [Figure 15] Side view of film drive unit [Figure 16] Perspective bottom view of the film drive unit [Figure 17] Side view of punched grid locker [Figure 18] Front view of the punched grid locker of Figure 17 [Figure 19] Plan view of punched grid locker [Figure 20] Perspective view of punched grid locker [Figure 21] Side view of another punched grate locker [Figure 22] Front view of the punched grid locker of Figure 21 [Figure 23] Plan view of the punched grid locker of Figure 21 [Figure 24] Perspective view of a punched lattice locker from above DETAILED DESCRIPTION OF THE INVENTION

[0032] In a schematic side view of a punching machine 1 for punching labels and closures for containers such as bottles, cans, cups and deep-drawn trays made of plastic or aluminum, the reference numeral 3 designates a side plate which is part of the machine frame. The essential elements of the punching machine 1 include a main drive 7 with a servomotor 9, a spindle 11, guide elements such as a tool carriage which linearly guides a punching punch 13 towards a die 57 on a base plate 15, a feed unit 17 for a film 19 as a strip of punching material which can be drawn from a coil 21 used as a strip store, a punching grid drive 23 mounted in the punching tool, and a dancer element in the form of a punching grid rocker 25.

[0033] The punching material, hereinafter simply referred to as film 19, is supplied to the punching machine 1 from a coil 21. The film 19 is drawn from the coil 21 by a feed unit 17, upstream of which a dancer can be arranged (Figs. 5 to 10).

[0034] The feed unit 17 has two rollers 29 arranged on parallel shafts, which are preferably provided around their periphery with a rubber lining or rubber cover 41 that ensures slip-free feeding of the film 19. At least one of the rollers 29 is drivable by a drive motor 53.

[0035] Preferably, both rollers 29 are driven synchronously. Both rollers 29 have a shaft 37 on which a number of magnets 33 arranged in a row parallel to the axis are arranged in holes 35 extending radially to the axis. The magnets 33 can also be fixed to the surface of the shaft 37. The shaft 37 can have a circular or rectangular cross section.

[0036] Distributed over the axial length of the shaft 37 and arranged between the magnets 33 are bearing rings 39 that are rotatable on the shaft 37. The inner ring of the bearing ring 39 is non-rotatably connected to the shaft 33. The outer ring 39 supports a tube 38 that constitutes a rubber cover.

[0037] The shaft 37 forms a core for a tube 38 with a rubber cover 41. Gears 43 are mounted on both ends of the shaft 37 and non-rotatably connected to the tube 38 at the ends of the tube 38. Two such rollers 29 thus formed are supported at their ends by bearing blocks 45 (Fig. 10).

[0038] A first shaft bearing 47 is arranged in the bearing block 45 and is fixedly connected to the bearing block 45 at its end face. A movable second shaft bearing fixed on a guide rod 49 of the first shaft bearing 47 supports the second roller 29.

[0039] Both rollers 29 are driven in opposite directions by one or more drive motors 53 with toothed belts 55. The toothed belts 55 are wound around the gears 43 of both rollers 29. The gears 47 of the other roller 29 are driven synchronously by the outer teeth of the toothed belts 55. In other words, both rollers 29 can be driven at the same peripheral speed in precise electronic synchronization.

[0040] The rollers 29, which are thin compared to their axial length, are attracted to each other by a non-rotating shaft 37 located at their centers or by an electromagnet or permanent magnet 33 located thereon.

[0041] In this way, a uniform mutual pressing force around the rubber cover 41 can be achieved over the entire axial length of the rollers 29. This uniform mutual attractive force extending over the entire axial length of the rollers 29 remains maintained regardless of the thickness of the film 19 being conveyed between the rollers 29. Changes in the axial spacing between the rollers 29 due to films 19 of different thicknesses are accommodated by moving one of the rollers 29 on a guide 49 in which the second shaft bearing is supported so as to be radially movable.

[0042] The mutual force of attraction can be adjusted. For this purpose, the shaft 37 is rotatably fixed to a bearing block 45 over a predetermined rotation angle, so that the radial spacing of the magnets 33 on the shaft 37 can be adjusted. The maximum force of attraction occurs when the magnets 33 on both shafts 37 face each other exactly between the rotation axes of the rollers 29; when the magnets are rotated by a few degrees, the mutual force of attraction decreases accordingly.

[0043] In a simple configuration of the shafts 37, only one of the two shafts 37 is provided with a magnet 33. In that case, the second shaft 37 without the magnet is made of a ferromagnetic material.

[0044] The rotation angle of the shaft 37 can be adjusted by engaging the end of the shaft 37 at its end face.

[0045] The film 19, pulled from the coil 21 by the feed unit 17, then reaches the punching device 5, i.e., between the punching punch 13 and the base plate 15 (FIG. 11) equipped with the die 57. The punching grid drive 59 between the punching punch 13 and the die 57 for guiding the film 19 through the punching device 5 has a bearing housing 61 on the outside of the punching device, inside which there is a gear unit with conveying rollers 63 with parallel rotation axes protruding from the housing 61 at their end faces (FIGS. 12-15). Furthermore, FIG. 16 shows that the housing 16 is supported by the conveying rollers 63 in vertically formed guide holes in the base plate 15 for vertical movement. A ball cage 64 ensures low-friction movement of the housing 61, and thus of the film drive 59. Furthermore, a drive motor 65 is arranged in each bearing housing 61.

[0046] As can be seen in FIG. 11 , the film drives 59 are arranged in pairs outside the periphery of the die 57, and the transport rollers 63 are arranged so that the longitudinal edge regions of the strip of film 19 can be clamped to the base plate 15 on the inlet and outlet sides during the punching process, held under tension, and subsequently transported. Thus, the film 19 is held by the four transport roller pairs 63 during the punching process, both when the film 19 is stationary and when it is transported. Therefore, the film cannot shrink longitudinally, transversely, or diagonally. As a result, the punched grid that results after punching is always held under tension, even when the film 19 is removed from the punching area. Even when most of the surface of the strip of film 19 has been punched out of the film, leaving only narrow webs that no longer have a stable relationship in some areas, the punching grid shrinks the lateral edges of the film 19 that have not been punched out so that the web remaining in the punching grid can be removed from the punching area without getting caught in the punching device 5. The film drive 59 is necessarily made very compact, since it is located between the base plate 15 with the die 57 and the punch 13. The film drive 59 gradually transports the film 19 between these elements by means of its transport rollers 63.

[0047] To maintain tension at the edges of the film 19, especially for films 19 made of a relatively elastic material, the axes of the transport rollers 63 can be slightly tilted so that the transport rollers always pull the film 19 outward, holding it in tension between the transport rollers 63 and significantly minimizing the formation of waves or wrinkles in the material. This significantly reduces interruptions in production.

[0048] The vertically movable support and guidance of film drive 59, made possible by linear guides 81 guided downward from bearing housing 61 and axially movably supported in base plate 15, allows film drive 59 to be lifted vertically away from die 57 during the feeding of film 19 and to be guided again toward and abut die 57 there when punching device 5 is closed. This play of film 19 during feeding between its underside and the surface of die 57 further promotes low-friction transport of film 19 during introduction into punching device 5 and, on the other hand, a reliable removal of the punched grid from punching device 5 during the feeding of film 19.

[0049] The punched grid guided out of the punching device 5 reaches, via a second deflecting roller 73, the area of ​​the punched grid rocker 25 (FIGS. 17 to 20), also commonly called dancer or dancer device.

[0050] The first embodiment of the punched grate rocker 25 (FIGS. 17-20) has a first deflecting roller 71 which is axially movable by a pneumatic cylinder 69 or a spring element and which is positioned parallel to a second deflecting roller 73. The end of the first deflecting roller 71 is supported in a bearing block 75 on a horizontally arranged guide profile 77 so as to be movable in parallel.

[0051] Below the first deflection roller 71, a pull-out roller pair 79 is arranged, which comprises two cooperating pull-out rollers 80, the rotation axes of which extend parallel to the rotation axes of the first deflection roller 71 and the second deflection roller 73. The rollers 80 of the pull-out roller pair 79 can be driven by a drive (not shown). The configuration of the pull-out roller pair 79 can correspond to the configuration of the feed unit 17 for pulling the film 19 from the coil 21.

[0052] The elements of the punched grid locker 25 are arranged on a common modular rocker frame.

[0053] Furthermore, the punched grid rocker 25 has a position sensor 67 for measuring the position of the first deflection roller 71. The first deflection roller 71 and the second deflection roller 73 as well as the rollers 80 of the pull-out roller pair 79 and the position sensor 67 are mounted on a frame (not shown), which can be connected to the side plate 3 and / or to the machine base (not shown).

[0054] Another particularly advantageous configuration of the punched grid rocker 25 is shown in Figures 21-24.

[0055] Two pivot arms 99 are pivotally attached to a rocker frame consisting of two parallel, spaced apart rocker side walls 97. One end of each pivot arm 99 is pivotally fixed to the side wall 97 of the rocker frame, and each pivot arm 99 can be adjusted relative to the side wall 97 of the rocker side wall 97 by a spring element, for example, a pneumatic cylinder, so that the angle of the side wall 97 relative to the fixed plate of the rocker frame is adjustable.

[0056] Between the ends of the pivoting arms 99 opposite the pivot axis A, a first deflecting roller 71 is inserted, which therefore guides the material from the punching device via the first deflecting roller 71 to the second deflecting roller 73 and from there to the withdrawal roller pair 79.

[0057] Thus, as in the first embodiment, the film 19 is deflected between the pair of withdrawal rollers 99 and the second deflection roller 73 arranged thereon, so that disturbances due to uneven tension in the filmstrip during film feeding and film withdrawal can be compensated for by pivoting the pivoting arm 99 to which the first deflection roller 71 is fixed.

[0058] The punched grid rocker 25 is therefore used to ensure that the punched grid is transported gradually or continuously as parallel as possible through the punching device 5 to the pair of pull-off rollers 79 that constitute the second feed unit. Integrated position monitoring by a position sensor 67 of the movable first deflection roller 71 is used to control the speed of the pair of pull-off rollers 79. Controlling the pull-off speed compensates for any distortions in the punched grid, whether positive or negative, slippage within the feed unit, position errors in the feed unit or different roller diameters (rubber wear) at the feed unit, thus ensuring that the film 19 or punched grid is always guided tension-free between the first feed unit 17 and the pair of pull-off rollers 79.

[0059] After the pair of withdrawal rollers 79, the punched grid can be sucked out, but can also be wound up in a sleeve for removal and disposal.

[0060] To punch the film 19 in the punching device 5, i.e., between the punching punch 13 and the die on the base plate 15, the main drive 7 shown in FIGS. 2 to 4 is used. The output shaft 85 of the servo motor 9 can be coupled to the spindle 11 (the spindle is only partially visible in FIG. 2) or directly by a coupling 87. The spindle 11 is rotatably mounted in a spindle housing 91 and drives a fixing plate 93 for the punching punch 13. The fixing plate 93 is guided axially of the spindle 11 in a tool carriage 95. The force acting on the spindle 11 during the punching stroke is transmitted from the spindle housing 91 to the side plate 3.

[0061] The servo motor 9 is connected to a machine control unit (not shown). The control unit generates punching stroke parameters, i.e., the penetration depth, i.e., the maximum and minimum punch strokes, as well as the acceleration or deceleration during the punching stroke and, if necessary, the reversal or holding point located between the punch's end points. The variations in the curve traversed by the punching punch 13 during the punching stroke can be generated electronically and can be adjusted and / or changed at any time. This allows for adaptation to the material from which the film 19 is made, as well as its mechanical properties, such as hardness and elasticity, and its respective thickness, without mechanical intervention in the machine when changing the thickness of the processed film 19. For example, a relatively soft film 19 can be initially slightly compressed and then only be punched.

[0062] Furthermore, the return stroke, i.e. the retraction of the punch 13, may also be performed with a suitable variable speed and / or variable retraction curve. The present invention may also include the following aspects: 1. A die-cutting machine for cutting labels and lids for containers made of paper, plastic, metal or laminates made thereof from strip-shaped film supplied in strip form, a feed unit (17) for transporting the film from the coil (21) to a punching tool; a punching tool with a punching punch and a die on a base plate (15) with a guide for the punch during its stroke movement, and a drive mechanism for generating the stroke movement of the punch; A drawing device for drawing out the punched grid from the punching device and supplying the punched grid to the punched grid receiving part; In those having A punching machine characterized in that a drive mechanism for generating linear motion of a punch (13) has a servo motor (9) equipped with a spindle (11), and the spindle (11) is coupled to a tool carriage (95) that supports and guides the punch (13). 2. The punching machine according to claim 1, wherein the spindle (11) is coupled to the servo motor (9) by a coupling (87). 3. The punching machine according to claim 1, wherein the spindle is a component of a servo motor (9). 4. A coil (21) as a strip reservoir for the film to be punched; an electrically drivable feeding device (17) for drawing a strip of film from the strip storage and feeding the film (19) to the punching device (5); In the punching machine according to any one of 1. to 3. above, 1. A punching machine according to claim 1, wherein the feed device comprises a feed unit (17) with two cooperating rotatably driven rollers (29), the rollers (29) having a cover (41) made of rubber arranged on a tube (38), the tube (38) being supported by a bearing ring (39) and rotatably supported on a shaft (37), and wherein magnets (33) arranged parallel to the axis of the shaft (37) are fixed on the shaft (37), and the magnets attract the rollers (29) to each other over their axial length by their mutual attractive force. 5. A punching machine as described in 4. above, characterized in that the magnets (33) are fixed on the shaft (37) at a distance from the rotation axis of the rollers (29), and the shaft (37) is formed to be rotatable and adjustable about its axis so that the mutual spacing between the magnets (33) on both rollers (29) can be adjusted. 6. A punching machine as described in 4. or 5. above, characterized in that one gear (43) is fixed to one or both ends of the tubes (38) of both rollers (29), one or two toothed belts (55) are at least partially wound around this gear, and the toothed belts (55) can be driven by a drive motor (53). 7. A punching machine as described in 6. above, characterized in that when the toothed belt simultaneously wraps around and drives both gears (43) of both rollers (29), the toothed belt (55) has teeth on both sides. 8. A punching machine as described in 1 above, characterized in that a pair of drivable conveying rollers (63) facing each other are arranged on the base plate (15) of the die (57), and are cantilevered by a bearing housing (61) arranged on the base plate (15). 9. A punching machine as described in 8 above, characterized in that the bearing housing (61) is supported so as to be able to move up and down vertically relative to the surface of the base plate (15). 10. A punching machine as described in 9. above, characterized in that a linear guide (81) is attached to the underside of the bearing housing (61), and this linear guide allows the bearing housing (81) to move vertically within the hole in the base plate (15). 11. A punching machine according to claim 10, characterized in that a roller cage is used as the linear guide (81). 12. The punching machine according to any one of items 9 to 11 above, characterized in that the rotation axes of the pair of conveying rollers (63) facing each other extend so as to be coaxial. 13. A punching machine as described in paragraph 11 above, characterized in that the rotation axes of the opposing conveying roller pairs (63) are arranged to extend at an acute angle to each other. 14. A punching machine according to any one of items 8 to 13 above, characterized in that two sets of two pairs of conveying rollers (63) are arranged on the base plate (15) so as to be arranged in a rectangle. 15. A punching machine as described in 1. above, characterized in that a punching grid rocker (25) is inserted between the punching device (5) and the pair of withdrawal rollers (79), and this punching grid rocker has a first deflection roller (71) as a dancer to deflect the incoming film (19), and 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 supported so as to be movable parallel to its rotation axis. 16. A punching machine as described in paragraph 15 above, characterized in that the end of the first deflection roller (71) is movably supported on a guide rail (89) or is movable parallel to the axis on an arc portion at the end of a pivoting arm (99). 17. A punching machine according to claim 15 or 16, characterized in that the first deflection roller (71) is held so as to be elastically movable in parallel by pulling it by a spring element, a spring assembly or a pneumatic cylinder (69). 18. A punching machine according to any one of the above items 15 to 17, characterized in that the position of the first deflection roller (7) relative to the pull-out roller (80) can be measured and adjusted by a position sensor (67). 19. A punching machine according to any one of items 15 to 18 above, characterized in that the first deflection roller (71) is supported on both sides in bearing blocks (75), and the bearing blocks are arranged so as to be movable in parallel on a guide profile (77). 20. A punching machine according to any one of the above items 16 to 18, characterized in that the pivoting arm (99) is pivotable by a spring element, a spring assembly or an air cylinder (69), and its position is adjustable. 21. A method for controlling a punching stroke in a punching machine for punching labels and closures from a film for containers, in which the punching punch (11) performs a stroke movement, penetrating into and cutting the film during the feed stroke of the punch (11) and then returning to its initial position during the return stroke, A method characterized in that the stroke movements during the working stroke and the return stroke are variable in terms of distance and time depending on the thickness and properties of the film to be treated.

Claims

1. A die-cutting machine for punching labels and lids for containers made of paper, plastic, metal or a laminate made thereof from a strip-shaped film supplied in the form of a strip, comprising: a feed unit (17) for transporting the film from the coil (21) to a punching tool; a punching tool with a punch and a die on a base plate (15) with a guide for the punch during its stroke movement, and a drive mechanism for generating the stroke movement of the punch; A drawing device for drawing the punched grid from the punching device and supplying the punched grid to the punched grid receiving section; In those having The drive mechanism for generating the linear motion of the punch (13) has a servo motor (9) with a spindle (11), the spindle (11) is coupled to a tool carriage (95) that supports and guides the punch (13), and the punching device is a coil (21) as a strip reservoir for the film to be punched; an electrically drivable feeding device (17) for drawing the film strip from the strip store and feeding the film (19) to the punching device (5); the feed device comprises a feed unit (17) with two cooperating rotatably driven rollers (29), the rollers (29) having a cover (41) made of rubber arranged on a tube (38), the tube (38) being supported by a bearing ring (39) and rotatably supported on a shaft (37), and magnets (33) arranged parallel to its axis are fixed on the shaft (37), which magnets attract the rollers (29) to each other over their axial length by their mutual attractive force.

2. A punching machine as described in claim 1, characterized in that the spindle (11) is connected to the servo motor (9) by a coupling (87).

3. 2. A punching machine according to claim 1, characterized in that the spindle is a component of a servomotor (9).

4. 4. A punching machine according to claim 1, wherein the magnets (33) are fixed on a shaft (37) at a distance from the rotation axis of the rollers (29), and the shaft (37) is configured to be rotatable and adjustable about its axis so that the mutual spacing of the magnets (33) on both rollers (29) can be adjusted.

5. 5. A punching machine according to claim 1, wherein a gear (43) is fixed to one or both ends of the tube (38) of each of the rollers (29), and one or two toothed belts (55) are at least partially wound around the gear, and the toothed belts (55) can be driven by a drive motor (53).

6. 6. A punching machine according to claim 5, characterized in that the toothed belt (55) has teeth on both sides when the toothed belt wraps around and drives both gears (43) of both rollers (29) simultaneously.

7. 2. A punching machine according to claim 1, characterized in that a pair of conveying rollers (63) that can be driven in pairs facing each other are arranged on the base plate (15) of the die (57), and are cantilevered by a bearing housing (61) arranged on the base plate (15).

8. 8. A punching machine according to claim 7, wherein the bearing housing (61) is supported so as to be vertically movable relative to the surface of the base plate (15).

9. 9. A punching machine according to claim 8, characterized in that a linear guide (81) is attached to the underside of the bearing housing (61), and by means of this linear guide the bearing housing (81) can be moved vertically within a hole in the base plate (15).

10. 10. A punching machine according to claim 9, characterized in that a roller cage is used as the linear guide (81).

11. 11. The punching machine according to claim 8, wherein the rotation axes of the pair of conveying rollers (63) facing each other extend so as to be coaxial.

12. 11. A punching machine according to claim 10, characterized in that the rotation axes of the opposing pairs of conveying rollers (63) are arranged so as to extend at an acute angle to each other.

13. 13. A punching machine according to any one of claims 7 to 12, characterized in that two sets of two pairs of conveying rollers (63) are arranged on the base plate (15) so as to be arranged in a rectangle.

14. 2. A punching machine according to claim 1, characterized in that a punching grid rocker (25) is inserted between the punching device (5) and the pair of withdrawal rollers (79), and that this punching grid rocker has a first deflecting roller (71) as a dancer for deflecting the incoming film (19), and that a second deflecting roller (73) is arranged between the punching device (5) and the first deflecting roller (71), and that the first deflecting roller (71) is supported so as to be movable in a horizontal direction parallel to its axis of rotation.

15. 15. A punching machine according to claim 14, characterized in that the end of the first deflecting roller (71) is movably supported on a guide rail (89) or is gripped at the end of a pivoting arm (99) and can be moved by pivoting the pivoting arm (99).

16. 16. A punching machine according to claim 14 or 15, characterized in that the first deflecting roller (71) is held elastically movable in a horizontal direction parallel to its axis of rotation by a spring element, a spring assembly or a pneumatic cylinder (69).

17. 17. Punching machine according to any one of claims 14 to 16, characterized in that the position of the first deflecting roller (7) relative to the withdrawal roller (80) is measurable and adjustable by means of a position sensor (67).

18. 18. Punching machine according to any one of claims 14 to 17, characterized in that the first deflecting roller (71) is mounted on both sides in bearing blocks (75), and that the bearing blocks are arranged so as to be horizontally movable on guide profiles (77).

19. 18. A punching machine according to any one of claims 15 to 17, characterized in that the pivoting arm (99) is pivotable and its position is adjustable by means of a spring element, a spring assembly or a pneumatic cylinder (69).

20. 20. A method for controlling the punching stroke in a punching machine for punching labels and closures from a film for containers according to any one of claims 1 to 19, wherein the punching punch (11) performs a stroke movement, penetrating into the film and cutting the film during the feed stroke of the punching punch (11) and then returning to its initial position during the return stroke, A method characterized in that the stroke movements during the working stroke and the return stroke are variable in terms of distance and time depending on the thickness and properties of the film to be treated.

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