Longitudinal cutting and welding device with ejection device

Abstract

The present invention relates to a longitudinal separation and welding device (22) for separating and welding a longitudinal side (40) of a material bag (20), comprising a transport device (48) for conveying a packaged item (12) wrapped by the material bag (20) in a transport direction (T), an upper punch (50) and a lower punch (52), wherein the upper punch (50) and the lower punch (52) are movable in a punch plane (68) between an open state and a closed state in which the upper punch (50) and the lower punch (52) abut one another, wherein the longitudinal separation and welding device (22) further comprises an ejection upper punch (54) and an ejection lower punch (56), which are movable relative to one another between an open position and a closed position in an ejection punch plane (68) lying parallel to the punch plane,wherein the expelling upper punch (54) and the expelling lower punch (56) are arranged on a side (154) of the punch plane (68) facing away from the transport device (48), wherein the expelling upper punch (54) has a cutting element (78) for at least partially cutting into the material bag (20) in the closed position, wherein the upper punch (50) has an upper punch drive for driving the upper punch (50) in the punch plane (68), and wherein the lower punch (52) has a lower punch drive for driving the lower punch (52) in the punch plane (68), and wherein the upper punch drive is different from the lower punch drive.

Description

[0001] The present invention relates to a longitudinal cutting and sealing device for cutting and sealing a longitudinal side of a film bag, comprising a transport device for conveying a packaged item wrapped by the film bag in a transport direction, an upper punch and a lower punch, wherein the upper punch and the lower punch are movable by means of a punch drive in a punch plane between an open state in which the upper punch and the lower punch have a punch distance between them, and a closed state in which the upper punch and the lower punch lie against one another.

[0002] Such a longitudinal cutting and welding device is known, for example, from the document DE 10 2010 032 164 A1.

[0003] Furthermore, the present invention relates to a method for expelling a film overhang of a film bag in a longitudinal cutting and welding device.

[0004] Film packaging machines are well known in the art. They are used to package individual items, bundles of items, or bulk goods, generally referred to as "packaged goods," in film. In recent years, the importance of film packaging machines has increased, particularly in the mail-order sector. Film packaging machines are used not only for packaging new goods, but also for repackaging returned goods, so-called returned goods, after they have been returned. To wrap these new goods or returned goods in film, packaging machines are used that must be capable of packaging packaged goods of different widths consecutively at high speed.

[0005] Since it is impossible to predict the order and width of returned goods, packaging using packaging machines that can be adjusted to a specific width, height, or length is not possible. Instead, packaging machines are required that automatically detect the dimensions of the packaged goods, especially the width, and then initiate a packaging process individually for each packaged item, specifically according to the detected width.

[0006] An example of such a packaging machine is shown in the document DE 10 2005 025 706 B3.This document shows a method for filling and welding packaged goods of varying sizes into film material, with the steps of aligning the individual packaged goods in a first longitudinal axis of a stationary alignment edge parallel to the transport direction, wrapping the individual packaged goods in half-tubular film material starting from the first longitudinal side of the packaged goods, transversely cutting and welding the half-tubular film material transversely to the transport direction of the packaged goods immediately in front of and behind the end faces thereof, so that half-tubular film sections are created, transversely offsetting the individual packaged goods wrapped in half-tubular film sections until the second longitudinal side thereof is aligned with a stationary closing edge parallel to the transport direction, and longitudinally cutting and welding the half-tubular film sections and thus welding the packaged goods parallel along their second longitudinal side.

[0007] For packaged goods of different widths, the first longitudinal cut-and-seal along a line edge generally poses no problem. The two transverse cut-and-seal processes can also be performed without any special measures. Due to the different widths, only the second longitudinal cut-and-seal process requires special equipment compared to film packaging machines designed for packaged goods of the same width.

[0008] One problem that arises here is that the film overhang of the film bag to be closed during the second longitudinal cutting and sealing process varies. Since a first longitudinal cutting and sealing process and two transverse cutting and sealing processes have already been carried out, the "film bag" at this point is a film wrapping of the packaged goods that has already been sealed on at least three sides, preferably four sides. Depending on the width of the packaged goods, the film material separated and to be disposed of now varies during the last longitudinal cutting and sealing process, the so-called "sealing". The fixing, cutting, and disposal of this excess film material of varying width is also referred to in the present application as "expulsion" of the film material.

[0009] The document DE 10 2012 106 827 B3 shows a longitudinal separation and welding device comprising an upper roller element and a lower roller element, wherein in the open state a roller distance between the upper roller element and the lower roller element is less than the punch distance, wherein in the closed state the upper roller element and the lower roller element abut one another, wherein the upper roller element and the upper punch are coupled so as to be movable relative to one another parallel to the punch plane, wherein the lower roller element and the lower punch are coupled so as to be movable relative to one another parallel to the punch plane, wherein at least one of the lower roller element and the lower punch is further coupled such that a relative movement parallel to the punch plane causes a pivoting movement of the lower roller element about a pivot axis running parallel to the transport direction away from the lower punch,or the upper roller element and the upper punch are further coupled in such a way that a relative movement parallel to the punch plane causes a pivoting movement of the upper roller element about a pivot axis running parallel to the transport direction away from the upper punch.

[0010] The aforementioned document DE 10 2010 032 164 A1 proposes a gripper capable of grasping the excess film strip. The gripper is then pivoted downward to pull the packaged goods toward the cutting and sealing dies and, after the film has been cut, to guide the excess film downwards away from the machine.

[0011] The document DE 10 2014 104 252 B3 shows a longitudinal cutting and sealing device for cutting and sealing a longitudinal side of a film bag, comprising a transport device for conveying a packaged item wrapped by the film bag in a transport direction, an upper punch and a lower punch, wherein the upper punch and the lower punch are movable by means of a punch drive in a punch plane between an open state, in which the upper punch and the lower punch have a punch distance between them, and a closed state, in which the upper punch and the lower punch lie against one another, wherein the longitudinal cutting and sealing device further comprises an ejection upper punch and an ejection lower punch, which are movable relative to one another between an open position and a closed position in an ejection punch plane lying parallel to the punch plane,The upper expulsion punch and the lower expulsion punch are arranged on a side of the punch plane facing away from the transport device, the upper expulsion punch having a cutting element for at least partially cutting the film bag in the closed position, and the upper expulsion punch being pivotally mounted about a pivot axis running parallel to the transport direction. Furthermore, the present invention relates to a method for expelling film overhang from a film bag in a longitudinal cutting and sealing device.

[0012] Furthermore, for example, the document DE 10 2020 106 030 A1 shows a longitudinal cutting and welding device for cutting and welding an upper paper web and a lower paper web, wherein the longitudinal cutting and welding device has at least a first pair of rotating endless elements which pull the first and the second paper web between them and guide them in a paper web plane, wherein the longitudinal cutting and welding device has a welding device, wherein the welding device has a heatable welding wheel for welding the paper webs and a pressing assembly for supporting the paper webs against the welding wheel, wherein the pressing assembly has at least one pressing wheel, wherein the welding wheel is adjustable between a working position in which the pressing assembly rests against the welding wheel and a rest position in which the welding wheel is spaced from the pressing assembly,wherein the welding device has at least one pretensioning element that pretensions the welding wheel into the rest position, wherein the superimposed paper webs in the working position rest against the welding wheel in a contact area, wherein exactly two pressure wheels are provided for supporting the paper webs against the welding wheel, wherein the two pressure wheels are spaced apart from one another in the transport direction and are arranged with respect to the paper web plane on a first side of the superimposed paper webs, which side is opposite a second side of the superimposed paper webs on which the welding wheel is arranged, wherein the contact area lies between the two pressure wheels, and wherein the contact area is designed such that the superimposed paper webs wrap around the welding wheel at least partially along an outer circumference.

[0013] The challenges of “welding” now also arise for paper materials, so that improved longitudinal cutting and welding devices are required for both films and plastics as well as for paper.

[0014] It is therefore an object of the present invention to provide an improved longitudinal cutting and welding device and an improved method for expelling a material overhang of a material bag in a longitudinal cutting and welding device.

[0015] According to a first aspect, a longitudinal separation and welding device is provided for separating and welding a longitudinal side of a material bag, comprising a transport device for conveying a packaged item wrapped by the material bag in a transport direction, an upper punch and a lower punch, wherein the upper punch and the lower punch are movable in a punch plane between an open state, in which the upper punch and the lower punch have a punch spacing between them, and a closed state, in which the upper punch and the lower punch abut one another, wherein the longitudinal separation and welding device further comprises an ejection upper punch and an ejection lower punch, which are movable relative to one another between an open position and a closed position in an ejection punch plane lying parallel to the punch plane,wherein the upper ejector punch and the lower ejector punch are arranged on a side of the punch plane facing away from the transport device, wherein the upper ejector punch has a cutting element for at least partially cutting the material bag in the closed position, wherein the upper punch has an upper punch drive for driving the upper punch in the punch plane, and wherein the lower punch has a lower punch drive for driving the lower punch in the punch plane, and wherein the upper punch drive is different from the lower punch drive.

[0016] The term “material” in this context refers to packaging material made from a material, which can be paper or a plastic film or plastic. Paper as a material can also be paper-like material made from materials other than fiber obtained from wood, but which has properties suitable for packaging, such as strength, foldability, or the like. In principle, however, hybrid packaging materials, e.g. paper / plastic composites or the like, are also included. It goes without saying that, in the case of paper as the material, the upper and lower material webs are each at least partially coated on the inner surfaces facing one another in order to enable thermal sealing or welding of the superimposed material webs.

[0017] In this way, a longitudinal cutting and welding device is provided in which both the upper punch and the lower punch are drivable. In particular, the upper punch has an upper punch drive and the lower punch has a lower punch drive. The lower punch drive is different from the upper punch drive. This allows the movements of the upper punch and the lower punch to be independent of one another. In this way, it is possible to design the movements of the upper punch and the lower punch towards one another differently and with different force applications. Furthermore, the drive types can be different and designed with regard to the respective force-displacement requirements. This makes it possible to dimension the cutting process with higher forces, which makes the cut-and-weld process of thick films and paper more reliable.

[0018] Direct power application can also eliminate the need for endless elements to transmit the drive torque of a remote motor. This avoids wear and maintenance on these endless elements.

[0019] Furthermore, according to a second aspect, a packaging machine is provided for packaging packaged goods in a material bag, comprising a longitudinal cutting and welding device according to the first aspect or one of its embodiments, comprising a supply unit which supplies the packaged goods to the longitudinal cutting and welding device in a material bag welded on its two transverse sides and on at least one longitudinal side, adjacent to a contact edge, and comprising a sensor which detects a width of the packaged goods running transversely to the transport direction upstream of the longitudinal cutting and welding device, wherein the longitudinal cutting and welding device is movable transversely to the transport direction.

[0020] Furthermore, according to a third aspect, a method is provided for expelling a material overhang of a material bag in a longitudinal cutting and sealing device with a transport device for conveying a packaged item wrapped by the material bag in a transport direction, an upper punch and a lower punch, wherein the upper punch and the lower punch are movable relative to one another in a punch plane, and with an expelling upper punch and an expelling lower punch, which are movable relative to one another in an expelling punch plane lying parallel to the punch plane between an open position and a closed position, wherein the expelling upper punch and the expelling lower punch are arranged on a side of the punch plane facing away from the transport device, wherein the expelling upper punch has a cutting element for at least partially cutting into the material bag in the closed position,wherein the upper punch has an upper punch drive for driving the upper punch in the punch plane, and the lower punch has a lower punch drive for driving the lower punch in the punch plane, and wherein the upper punch drive is different from the lower punch drive, with the following steps of moving the upper punch and the lower punch towards each other until the upper punch and the lower punch separate and seal the material bag between them; driving the lower punch in the punch plane; driving the upper punch in the punch plane until the upper punch and the lower punch clamp a material overhang of the material bag to be expelled between them and the cutting element cuts into the material overhang; and opening the longitudinal separation and sealing device.

[0021] The method according to the invention therefore provides the same advantages as the device according to the invention.

[0022] The above-mentioned task is therefore completely solved.

[0023] In one embodiment of the longitudinal cutting and welding device, it can be provided that the upper punch drive drives both the upper punch and the ejection upper punch, in particular independently of each other.

[0024] The upper punch drive drives both the upper punch and the upper expulsion punch. These are mechanically coupled so that both can be driven together. In particular, the lower punch drive can also drive both the lower punch and the lower expulsion punch. As explained below in the detailed description of the figures, a suitable spring-loaded mounting of the upper expulsion punch or the lower expulsion punch can be adjusted to apply different forces to the upper punch and the upper expulsion punch, or to the lower punch and the lower expulsion punch, thus preventing damage to the punches or the material.

[0025] In one embodiment of the longitudinal cutting and welding device, it can be provided that the longitudinal cutting and welding device has a C-shaped punch frame. The upper punch drive can be arranged at one end of one of the legs of the C-shaped punch frame, and the lower punch drive can be arranged at one end of the other leg of the C-shaped punch frame.

[0026] The C-shaped punch frame ensures that a high-quality weld seam is produced due to the direct and relatively high force applied to the material. The C-shaped punch frame absorbs the forces acting in the punch plane and the ejection punch plane and prevents the punches from shifting relative to each other when high direct forces are applied by the upper punch drive and the lower punch drive. The C-shaped punch frame is sufficiently dimensioned to prevent the punches from bending and moving relative to each other.If the upper punch drive is arranged at one end of one of the legs of the C-shaped punch frame, particularly in the operating position of the longitudinal cutting and welding device in the upper leg, and the lower punch drive is arranged at one end of the other leg of the C-shaped punch frame, particularly in the operating position of the longitudinal cutting and welding device in the lower leg, the drives are essentially opposite each other with respect to the transport plane in the punch plane and the exchange plane. This enables direct force application by the drives within the punch plane, which enables higher cutting forces.

[0027] In one embodiment of the longitudinal cutting and welding device, it can be provided that the ejection upper punch drive has an ejection upper punch drive motor, wherein the ejection upper punch drive has a camshaft in order to convert the rotational movement of the ejection upper punch drive motor into a movement of the ejection upper punch in the ejection punch plane.

[0028] The cam drive allows for particularly high forces to be applied to the upper punch. The motor converts its drive torque into a translational movement of the upper punch via the cam. The cam can be used to adjust a force-displacement curve that applies a high force when the punches are pressed together. This allows for particularly high cutting forces to be achieved.

[0029] In one embodiment of the longitudinal cutting and welding device, it can be provided that the ejection lower punch drive has an ejection lower punch drive actuator, wherein the ejection lower punch drive has at least one toggle lever in order to convert a movement of the ejection lower punch drive actuator into a movement of the ejection lower punch in the ejection punch plane.

[0030] This design of the lower punch drive converts the movement of the actuator, e.g., a spindle motor, into vertical movement via a toggle lever. The toggle lever offers the advantage that, in its fully extended position, extremely high forces can be absorbed without any movement in the vertical direction or within the punch plane. This allows the lower punch to be moved to its final position by fully extending the toggle lever, before the upper punch comes into contact with the lower punch and the relatively large separating force is exerted. The toggle lever can fully absorb the separating forces.

[0031] In one embodiment of the longitudinal cutting and welding device, it can be provided that the at least one toggle lever is fully extended in the closed position of the upper ejection punch and the lower ejection punch.

[0032] In this way, the fully extended toggle lever can be adjusted, for example, to the transport level of the material webs, for example halfway up the height of the goods to be packaged or another height at which the material webs run.

[0033] In one embodiment of the longitudinal cutting and welding device, it can be provided that the upper ejection punch is pivotally mounted in such a way that the cutting element can be pivoted by a pivot angle from the ejection punch plane away from the transport device.

[0034] By pivoting the upper ejector ram through a predefined angle, the pivoted position can be precisely adjusted. This allows waste containers or similar items to be positioned accordingly.

[0035] In a further embodiment of the longitudinal cutting and welding device, it can be provided that the upper expulsion punch has a housing, wherein the cutting element is movable in the expulsion punch plane relative to the housing.

[0036] In this way, it is possible to move the cutting element further out of the housing or to retract it into it.

[0037] Thus, in a further embodiment, it can be provided that the cutting element is movable between an extended position, in which the cutting element cuts into the material bag at least in sections in the closed position, and a retracted position retracted into the housing.

[0038] This makes it possible to retract the cutting element far enough into the housing to allow it to be removed from the material bag or excess material. The separated excess material can then fall down for disposal.

[0039] In a further embodiment of the longitudinal cutting and welding device, it can be provided that the housing of the upper ejection punch has at least one stripping element for stripping off a material overhang of the material bag during a movement of the cutting element from the extended position into the retracted position.

[0040] For example, such a stripping element can be configured near or adjacent to the cutting element. This ensures that when the cutting element is retracted into the housing of the upper ejection punch, the excess material from the material bag is reliably stripped and removed by the cutting element.

[0041] In a further embodiment of the longitudinal cutting and welding device, it can be provided that the cutting element has at least one needle element.

[0042] Such a needle element is understood to be a very thin and pointed element, relative to the overall length of the cutting element, which is suitable for cutting or rather piercing the material bag. With a preferably provided plurality of such needle elements, the material bag can be reliably pierced and expelled.

[0043] Furthermore, in one embodiment of the longitudinal cutting and sealing device, it is possible for the cutting element to be designed as a cutting blade. The cutting element is then an elongated cutting blade running in the transport direction, which can thus reliably cut into the material bag or the area located above the material bag.

[0044] In a further embodiment of the longitudinal cutting and welding device, it can be provided that the cutting blade has a cutting edge, wherein the cutting edge has at least one recess in order to prevent the cutting blade from cutting into an area of ​​the recess.

[0045] Such recesses ensure that the material bag is not cut across its entire length in the transport direction. Otherwise, an isolated area of ​​material could remain between the punch plane and the expulsion punch plane. Instead, uncut webs remain in the area of ​​the recesses, allowing the entire excess material on the side of the punch plane facing away from the transport device to be expelled.

[0046] In a further embodiment of the longitudinal cutting and welding device, the swivel angle can be 45°.

[0047] In this way, the excess material is moved sufficiently far away from the ejection punch level and can fall down safely for disposal.

[0048] In a further embodiment of the longitudinal cutting and welding device, it can be provided that the upper ejection punch and the lower ejection punch are spring-mounted in the ejection punch plane.

[0049] In this way, damage to, for example, the cutting element or a counter support of the ejection lower punch is avoided and, at the same time, the material bag can be cut safely by means of a maximum force application that can be defined via the spring system of the bearing.

[0050] In a further embodiment of the longitudinal cutting and welding device, it can be provided that the lower ejection punch is arranged in a stationary manner and the upper ejection punch is movable relative to the lower ejection punch.

[0051] In principle, this can be related to the intended movement of the upper punch and the lower punch. As will be explained below, it can be provided that the expelling upper punch and the expelling lower punch are driven by means of a separate drive within the expelling punch plane. However, it is preferred that the expelling upper punch and the expelling lower punch are each mechanically coupled to the upper punch or lower punch and are driven together with them. In both embodiments, it can be provided that the lower punch and the expelling lower punch are not moved, i.e. remain stationary, in which case the upper punch or the expelling upper punch can be driven accordingly. In principle, however, it is also possible in all embodiments for both the expelling upper punch and the expelling lower punch or the upper punch and the lower punch to be moved and moved relative to one another.

[0052] In a further embodiment, it can be provided that the longitudinal cutting and welding device further comprises a pivoting drive for pivoting the ejection upper punch.

[0053] Preferably, the upper ejection punch is movable around the pivot axis by means of a separate drive. The individual movements can then be coordinated electronically using the control device.

[0054] In a further embodiment, it can be provided that a cutting element drive is provided for moving the cutting element relative to a housing of the ejection upper punch.

[0055] The drive of the cutting element can thus also be provided separately, so that the movement of the cutting element relative to the housing of the upper ejection punch can be controlled separately via the control device.

[0056] In a further embodiment of the longitudinal cutting and welding device, it can be provided that the longitudinal cutting and welding device has an ejection upper punch drive for moving the ejection upper punch in the ejection punch plane relative to the ejection lower punch.

[0057] It is therefore quite possible for the upper ejection punch and / or the lower ejection punch to be moved within the ejection punch plane by means of a separate drive.

[0058] In a further embodiment, however, it can also be provided that the upper expulsion punch is mechanically coupled to the upper punch for moving the upper expulsion punch in the expulsion punch plane relative to the lower expulsion punch and is movable with the punch drive and / or that the lower expulsion punch is mechanically coupled to the lower punch for moving the lower expulsion punch in the expulsion punch plane relative to the upper expulsion punch and is movable with the punch drive.

[0059] Due to the mechanical coupling, the movement of the upper ejection punch and / or the lower ejection punch can be carried out without an additional drive coupled via the existing punch drive.

[0060] In a further embodiment of the longitudinal cutting and welding device, it can be provided that the transport device is designed as a suction belt at least in an area adjacent to the stamping plane.

[0061] In this way, the material bag can be more effectively secured in its position transverse to the transport direction by means of the suction belt. The design of such a suction belt is well known. For example, openings are provided in the transport device through which air is sucked out, thus reducing pressure. In this way, a section of the material bag located above the suction belt can be drawn to the suction belt. In this way, the likelihood of the material bag slipping in a direction transverse to the transport direction during expulsion can be reduced or virtually eliminated.

[0062] In a further embodiment of the longitudinal cutting and welding device, it can be provided that the longitudinal cutting and welding device has a support bar arranged next to the transport device on the side of the ejection punch plane for supporting a material overhang of the material bag.

[0063] In a further embodiment of the longitudinal cutting and welding device, it can be provided that the support bar is movable perpendicular to the transport direction and relative to the transport device between a support position and an expulsion position located further away from the transport device with respect to the support position.

[0064] In this way, any excess material from the bag can be supported during the movement of the packaged goods in the transport direction, especially if the excess material is very wide compared to the width of the packaged goods. This prevents the excess material from drooping downwards, for example, and causing the packaged goods to move undesirably due to the resulting weight forces. At the same time, moving the support bar away from the transport device can free up an area through which the expelled excess material can fall.

[0065] In one embodiment of the longitudinal cutting and sealing device, the support bar can be provided with a circumferential belt that forms a support surface for the material bag, wherein the support surface is movable in the transport direction. In this way, no frictional forces are generated when the material bag resting on the support bar moves in the transport direction.

[0066] In a further embodiment, it can be provided that an adjustment distance in the expulsion punch plane in the open position is adjustable between the expulsion upper punch and the expulsion lower punch.

[0067] In this way, it is possible, particularly in the case of a mechanical coupling of the upper ejection punch with the upper punch and / or the lower ejection punch with the lower punch, to adjust the corresponding distance and the movement of the upper ejection punch and the lower ejection punch together in the material plane.

[0068] In a further embodiment of the longitudinal cutting and sealing device, it can be provided that the upper punch and / or the lower punch are mounted in such a way that they can be pivoted about an axis running parallel to the transport direction from the outside towards the packaged goods into the punch plane.

[0069] In the case of mechanical coupling, the upper ejection punch and / or the lower ejection punch can also be pivoted from the outside towards the packaged goods around an axis running parallel to the transport direction.

[0070] This makes it possible, especially with very tall packaged goods, to ensure safe entry of the packaged goods into the longitudinal cutting and sealing device. Furthermore, it makes it possible to open the longitudinal cutting and sealing device for maintenance purposes.

[0071] Furthermore, a packaging machine for packaging packaged goods in a material bag can be provided with a longitudinal cutting and welding device according to the invention or one of its embodiments, with a supply unit which supplies the packaged goods to the longitudinal cutting and welding device in a material bag welded on its two transverse sides and on at least one longitudinal side, adjacent to a contact edge, and with a sensor which detects a width of the packaged goods running transversely to the transport direction upstream of the longitudinal cutting and welding device, wherein the longitudinal cutting and welding device is movable transversely to the transport direction.

[0072] This provides a packaging machine that, after packaging with three-side or four-side sealing in a standard width, can then be sealed to the desired width of the packaged goods using the longitudinal cutting and sealing device. This type of packaging machine is particularly suitable as a returns machine.

[0073] In one embodiment of the method, the method comprises the steps of pivoting the cutting element of the upper ejector punch by a pivot angle from the ejector punch plane away from the transport device; and pivoting the cutting element of the upper ejector punch back by the pivot angle toward the transport device in the ejector punch plane.

[0074] In this way, the separated material web can be reliably ejected by pivoting. This first fully extends the toggle lever, and the contact between the upper and lower punches is adjusted to the desired plane. The fully extended toggle lever can then absorb the high separating forces of the upper punch without causing any movement of the joined or pressed punches within the punch plane.

[0075] In a further embodiment of the method, it can be provided that the driving of the ejection lower punch is carried out in the ejection punch plane by at least one toggle lever of a ejection lower punch drive being fully extended.

[0076] Driven by the camshaft, particularly high pressing forces can be applied to the upper punch. The cam drive allows for the adjustment of a force-displacement curve that enables high separation forces when the punches are brought together.

[0077] In a further embodiment of the method, it can be provided that the driving of the upper ejection punch in the ejection punch plane is carried out by a motor of an upper ejection punch drive driving the upper ejection punch via a camshaft.

[0078] It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

[0079] Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. They show: Fig. 1 a schematic view of the individual stations of a packaging machine for packaging goods of different widths, Fig. 2a shows an embodiment of a supply unit of a packaging machine which operates with an upper and a lower material web, Fig. 2b a schematic top view of the representation in Fig. 2a, Fig. 3 a schematic plan view of a supply unit in an alternative embodiment, which operates according to the forming shoulder principle, Fig. 4 shows a schematic cross-sectional view of the longitudinal cutting welding device, Fig. 5 shows an isometric view of the longitudinal cutting welding device, Fig. 6 shows an isometric view of a frame and an ejector upper punch drive, Fig. 7 shows a side view of a lower punch drive, Fig. 8 a front view of a lower punch drive, Fig. 9 a schematic front view of an embodiment of the longitudinal cutting and welding device, Fig. 10 is a plan view illustrating a movement of the longitudinal cutting and welding device transverse to the transport direction, Fig. 11 is a further plan view in which the longitudinal cutting and sealing device is set to an incoming packaged product, and Fig. 12 a schematic flow diagram of an embodiment of a method for expelling a material excess from a material bag.

[0080] Fig. 1 shows a schematic side view of a packaging machine 10, from which the basic process for packaging a packaged item 12 can be seen.

[0081] A packaged item 12 enters the packaging machine 10 from the side and is conveyed through the packaging machine in a transport direction T. For this purpose, a conveyor device 14 is provided, which is generally composed of several conveyor belts that are connected to one another and convey the packaged item 12 through the individual stations of the packaging machine 10.

[0082] Schematically designated by reference numeral 16 is a so-called staging unit. This staging unit 16 prepackages the packaged goods 12 in such a way that they are contained in a material bag 20 that is sealed on three sides or, already in a standard width, on four sides. For this purpose, material from at least one roll 18 is fed into the staging unit 16 and further processed. Further processing is described in more detail below. Depending on the type of staging unit 16, several material outlets may be present, which is indicated by a further material outlet 19 shown in dashed lines.

[0083] The packaging machine 10 is designed for packaging packaged goods of varying widths. The material bag 20, which is sealed on at least three sides, in particular four sides, must therefore be cut-welded on its remaining fourth side in a longitudinal cutting-welding device 22 or, if the material bag arrives at the longitudinal cutting-welding device 22 already sealed on four sides, it must be sealed again to the correct width on one of the long sides. Typically, a sensor 24 is provided that detects the width of the packaged goods 12 and accordingly positions the units of the longitudinal cutting-welding device 22 in a control device 26 such that it reacts to the different widths of the packaged goods 12 and the longitudinal cutting-welding can be performed at a suitable location using the longitudinal cutting-welding device 22.Any remaining excess material, which is separated by the longitudinal cutting and sealing device 22, is then disposed of in a container or collecting device 27. Finally, the packaged goods 12, completely wrapped in the material bag 20, are then dispensed.

[0084] Fig. 2a shows a possible embodiment of the supply unit 16. In the illustrated embodiment, an upper material web 28 is drawn from an upper material draw-off device 18, and a lower material web 29 is drawn from a lower material draw-off device 19. The upper material web 28 and the lower material web 29 are brought together at a cross-cutting and welding device 30, where they form a material wall into which the packaged goods 12 are inserted. By means of the cross-cutting and welding device 30, the upper material web 28 and the lower material web 29 are separated and welded in front of and behind the packaged goods 12, so that a material bag 20 surrounding the packaged goods 12 is then created.

[0085] After the transverse cutting and sealing device 30, at least one continuous longitudinal cutting and sealing device 32 is provided, which seals one longitudinal side of the material bag 20. This continuous longitudinal cutting and sealing device 32 can, in particular, be designed according to the continuous principle, i.e., the packaged goods 12 are continuously conveyed past the continuous longitudinal cutting and sealing device 32, whereby at least one longitudinal side of the material bag 20 is sealed.

[0086] In the Fig. Figure 2b shows a schematic plan view of the process described above. The packaged item 12 rests against a contact edge 34. The packaged item 12 has a width 36 transverse to the transport direction T, which can vary between the respective packaged items 12. The packaged item 12 has a first longitudinal side 38, with which it rests against the contact edge 34, and has a second longitudinal side 40, the position of which can vary depending on the width 36. Furthermore, the packaged item 12 has two transverse sides 42, 44. The packaged item 12 is welded on the transverse sides 42 and 44 by means of the transverse cutting and welding device 30. The longitudinal side 38 is welded by means of the continuous longitudinal cutting and welding device 32. For welding the last longitudinal side 40, a further continuous longitudinal cutting welding device 32' can then be provided, or the longitudinal side 40 is then welded by means of the longitudinal cutting welding device 22 as proposed.The material bag 20 can thus be transported from the preparation unit 16 to the longitudinal cutting and sealing device 22, welded on three sides 38, 42, 44. However, it can also be provided that the material bag 20 is already welded on all four sides 38, 40, 42, 44. The long side 40 is not yet welded to the actual width 36, but rather to a maximum possible width of a packaged item 12 in the packaging machine 10. The welding to the actual width 36 only takes place in the longitudinal cutting and sealing device 22. The pre-welding on the long side 40 by means of the continuous longitudinal cutting and sealing device 32' has the advantage that an otherwise open side 40 of the material bag 20 enters the longitudinal cutting and sealing device 22 already welded together and can thus be inserted more easily.

[0087] In the Fig. 3 shows a plan view of another possible design for the supply unit 16'. Instead of an upper material web 28 and a lower material web 29, it can also be provided that a forming shoulder 46 is provided, via which the material is removed from a material take-off device 18. The material is then placed over the forming shoulder 46 in such a way that a material half-tube is formed, into which the packaged item 12 can be inserted. The material half-tube is only open on three sides, namely the transverse sides 42, 44 and the longitudinal side 40 facing away from the contact edge 34. Consequently, only one transverse cutting and welding device 30 is required, which welds the transverse sides 42, 44 of the packaged item 12. Ultimately, however, the longitudinal side 40 facing away from the contact edge 34 still has to be welded using the proposed longitudinal cutting and welding device 22.In principle, alternatively, pre-welding of the longitudinal side 40 can also be carried out by means of a continuous longitudinal cutting and welding device 32', as is the case in connection with the . Fig. 2b. However, in this embodiment, the material bag 20 is often guided directly into the longitudinal cutting and welding device 22 after the transverse cutting and welding device 30.

[0088] The Fig. 4 shows a schematic cross-sectional view of the area of ​​the punch plane 68 and the expulsion punch plane 76 of the longitudinal cutting and welding device 22. Identical elements are identified by identical reference numerals and will not be explained again below.

[0089] In the example shown, the packaged item 12 is already welded on all four sides. The material bag 20 is therefore closed on all four sides. However, the welding was initially only carried out over a standard width that exceeds the width of the packaged item 12. Therefore, the material bag must be welded again at a desired proximity to the packaged item 12. As usual, the upper punch 50 and the lower punch 52 are used for the longitudinal separation welding, which longitudinally separate the material projection 82 in the punch plane 68. In the upper punch, for example, a cutting blade 86 heated by a heating cartridge 84, which is located in the upper punch 50, can be used for this purpose. The lower punch 52 can have a counter element 88, which is made, for example, from a correspondingly hard and heat-resistant material.In this way, a longitudinal weld seam is formed between the counter-element 88 and the cutting blade 86, and the material overhang 82 is separated from the remaining material bag 20 of the packaged goods 12. This material overhang 82 is now shown in the illustration of the . Fig. 4 are driven out to the right.

[0090] To prevent the packaged goods 12 from slipping during separation, the transport device 48 can be designed as a suction belt in a region of the transport device 48 that faces and is adjacent to the stamping plane 68. This region is schematically designated by reference numeral 90. For this purpose, openings 93 can be provided in the transport device 48 in this region, for example.

[0091] As can be seen from the sectional view, the upper ejector punch 54 is mechanically coupled to the upper punch 50, just as the lower ejector punch 56 is mechanically coupled to the lower punch 52. These elements therefore each perform the corresponding lifting movements together. In addition, however, a spring bearing 83 is provided, which supports the upper ejector punch 54 in the ejector punch plane 76. A corresponding spring bearing 84 can also be provided for the lower ejector punch 56. This does not necessarily have to be the case, however. In this way, when the elements are brought together, damage to, for example, the cutting element 78 can be avoided if this presses against the lower ejector punch 56 when cutting into the material bag 20. In order to ensure the desired force application here, it can be provided that in the Fig. 4, an adjustment distance 100 can be set. The upper ejector punch 54 is pivotable by means of the pivot drive 72. The pivoting takes place about the pivot axis 74. For this purpose, the pivot drive 72 is provided. This engages a cantilever arm 94, which rotates a hexagonal rod 96, to which the upper ejector punch 54 is rotationally fixedly coupled. Of course, any other profile rod or a force-locking shaft-hub connection can also be used. The upper ejector punch 54 has a housing 70, which can, for example, consist of only two plates arranged parallel to the ejector punch plane 76. Within this housing, the cutting element 78 is mounted so as to be movable in the ejector punch plane 76 relative to the housing 70. A cutting element drive 80 is provided for this movement. In the illustration in Fig. 4, the cutting element 78 is in its extended position 92. In this position, the cutting element 78 protrudes from the housing 70. In this way, the cutting element 78 can cut into the material projection 82. For this purpose, one or more grooves 97 can be provided on the opposite side in the lower ejection punch 56, so that the cutting element 78 can cut through the material projection 82. The groove 97 is preferably open in the direction facing away from the transport device 68, so that when the upper ejection punch 54 is pivoted about the pivot axis 74, the cutting element 78 can pivot out of the groove 97.

[0092] Furthermore, at least one stripping element 98 is provided on the housing in order to strip the excess material 82 from the cutting element 78 when the cutting element 78 is moved into a retracted position within the housing 70.

[0093] Furthermore, a support bar 102 is provided to support the material overhang 82 on the side facing away from the transport device 48, particularly in the case of very narrow packaged goods 12. The support bar 102 is movable transversely to the transport direction T, as indicated by an arrow 104. The support bar 102 has a belt 106, which can be made of a rubber material, for example, and which rotates in the transport direction T. A support surface 108 therefore runs in the transport direction at the speed of the transport device 48.

[0094] Fig. Figure 5 shows a symmetrical view of the longitudinal cutting and welding device 22. The upper punch 50 and the lower punch 52 are shown in a closed position. The support bar 102 is moved outward. The upper punch drive 58 is also visible. In the operating position, this is arranged vertically above the upper punch 50. The upper punch and the lower punch are mounted by means of a punch frame 200. The punch frame 200 ensures the positioning of the upper punch 50 and the lower punch 52 vertically one above the other and absorbs the forces acting during the cutting and welding process, the forces applied by the upper punch drive 58 and the lower punch drive 57 shown below.

[0095] Fig. Figure 6 shows an enlarged view of the stamp frame 200. The stamp frame 200 has a C-shaped cross-section. The C-shaped stamp frame is open on one side, in the illustrative Fig. 6 has the open side facing down to the right. Accordingly, the C has two legs, designated by the reference numerals 201 and 203, respectively. Leg 201 has an end 202. Leg 203 has an end 204. The ends are therefore facing the open side of the C. At the end 202 of leg 201, the upper punch drive 58 is arranged. This comprises, for example, the motor 206 and the camshaft 208. At the end 204 of leg 203, the lower punch drive is arranged, which in Fig. 6 is not shown for illustration purposes. This shows guides 210 and 210' in the Fig. 7 shown or Fig. 8 shown rod elements 212 and 212' are guided.

[0096] In this way, the C-shaped punch frame 200 makes it possible to absorb the forces acting during punch assembly. The punch frame 200 is dimensioned such that it can fully absorb the acting forces without bending, so that the upper punch and the lower punch do not shift relative to each other during the application of force.

[0097] The Fig. Figure 7 shows a side view of the lower punch drive 57. This includes an actuator 220, which can be, for example, a pneumatic cylinder, a spindle drive, or any drive capable of providing a linear back-and-forth movement in the direction of arrow 214. In this manner, a toggle lever 218 can be extended or contracted, enabling movement of one end of the toggle lever in the directions of the arrow indicated by 216. In this manner, the lower punch 52 and the ejector lower punch 56 coupled thereto can be moved in the punch plane and the ejector punch plane, respectively.

[0098] Fig. Figure 8 shows an isometric view of the lower punch drive with the lower punch 52 and the ejector lower punch 56. In the Fig. 8 shows the rod elements 212 and 212', which are arranged in the Fig. 6 are guided by the guides 210 and 210' shown, respectively. In one embodiment shown, two toggle levers 218 and 218' are provided. In principle, a different number of toggle levers can be provided. However, an even number of toggle levers allows for symmetrical force application across the entire width of the lower punch.

[0099] Fig. Figure 9 shows a schematic front view of the longitudinal cutting and welding device 22. It can be seen that the housing is pivotally mounted on the profile shaft 96 about the pivot axis 74. This is coupled to the upper punch 50 via the spring bearing 82, 82'. As explained, pivoting of the housing can be provided via the pivot drive 72. Furthermore, it is shown how the movement of the cutting element 78 relative to the housing 70 can be activated by means of the cutting element drive 80. For this purpose, a recess 126 is preferably provided within the housing 70, through which the cutting element drive 80 can be articulated to the cutting element 78.

[0100] The cutting element 78 is designed as a cutting blade 128 and extends parallel to the transport direction T through the housing 70. It has a cutting edge 120 in which several recesses 122 are provided. Grooves 97 are located opposite the cutting edge 120 in the lower ejection punch. Accordingly, no grooves are provided in the area of ​​the recesses 122.

[0101] In a fundamental alternative embodiment, it can also be provided that the cutting element 78' is formed with one or more needles 124.

[0102] In both embodiments, the aim is to maintain webs in the area of ​​the recess 122 or between needles 124 in order to also expel an area of ​​the material projection 82 which is arranged between the punch plane 68 and the expulsion punch plane 76, compare Fig. 4.

[0103] In the Fig. 10 and Fig. 11 shows how an adjustment to the different widths 36 of the packaged goods 12 is carried out. The packaged goods 12 in Fig. 10 leaves the supply unit 16 adjacent to the contact edge 34. The width 36 of the packaged goods 12 is detected by means of the sensor 24. The control device 26 of the material packaging machine 10 can now move the longitudinal cutting and sealing device 22 in a transverse direction 116 to the transport direction T by means of a transverse drive 118 such that the stamping plane 68 extends in a suitable manner to the packaged goods 12. The exact position of the stamping plane 68 results from the width 36 of the packaged goods 12. The movement then results in the Fig. 11. The stamping plane 68 runs close to the long side 40 of the packaged goods 12, which still has to be sealed.

[0104] Furthermore, the Fig. 10 and in the Fig. 11 schematically shows the support bar 102. The indicated arrow 104 indicates that the support bar 102 can be moved away from the transport device 48 to make room for the expulsion of the excess material 82.

[0105] Furthermore, the area 90 of the transport device 48 adjacent to the stamp plane 68 is once again illustrated, in which the transport device is designed as a suction belt by means of the openings 93.

[0106] In the Fig. 12 is a schematic flow diagram of a method 130 for expelling the excess material 82 and the material bag 20 in one embodiment.

[0107] The method begins in a step 132. First, a longitudinal cutting and sealing device 22 is provided, as described above. First, as described above, the packaged item 12 is sealed on its two transverse sides 42, 44 and the longitudinal side 38 adjacent to the contact edge 34 by means of the provision unit 16 and passed on to the longitudinal cutting and sealing device 22. The width 36 of the packaged item 12 is then detected. The longitudinal cutting and sealing device 22 can then be moved in the transverse direction 116 so that the stamping plane 68 is suitably adjusted to the width 36 of the packaged item 12. The packaged item 12 is conveyed into the longitudinal cutting and sealing device 22.

[0108] The following are the steps of the longitudinal cutting welding process 130.

[0109] After a start step 132, a step of moving 134 the upper punch 50 and the lower punch 52 towards each other is first carried out until the upper punch 50 and the lower punch 52 separate and weld the material bag 20 between them.

[0110] Simultaneously or subsequently, a step of moving 136 the upper expulsion punch 54 and the lower expulsion punch 56 towards each other is carried out until the upper expulsion punch 54 and the lower expulsion punch 56 clamp the excess material of the material bag 20 to be expelled between them and the cutting element 78 cuts into the excess material 82.

[0111] The movement of the lower punch 52 in the punch plane 68 is performed by fully extending at least one toggle lever 218 of the lower punch drive 57. The movement of the upper punch 50 in the punch plane 68 is performed by a motor of an upper punch drive driving the upper punch 50 via a camshaft.

[0112] Then, optionally, a step 138 can be executed, in which the support bar 102 is moved into the expulsion position. This is followed by a step 140 in which the cutting element 78 of the expulsion upper punch 54 is pivoted out by a pivot angle 114 from the expulsion punch plane 76 away from the transport device 48. This occurs by pivoting the expulsion upper punch 54 about the pivot axis 74. Now, optionally, in a step 142, the cutting element 78 can be retracted into the retracted position to strip off the excess material 82. Subsequently, the cutting element 78 is optionally moved back into the extended position 92. In a step 146, the cutting element 78 of the expulsion upper punch 54 is pivoted back by the pivot angle 114 toward the transport device 48 into the expulsion punch plane 76.

[0113] At the latest in step 148, the support bar 102 is moved back into the support position, and finally, in step 150, the longitudinal cutting and welding device 22 is opened again. The process now ends in step 152.

Claims

[1] Longitudinal cutting and welding device (22) for cutting and welding a longitudinal side (40) of a material bag (20), comprising a transport device (48) for conveying a packaged item (12) enclosed by the material bag (20) in a transport direction (T), an upper punch (50) and a lower punch (52), wherein the upper punch (50) and the lower punch (52) are movable in a punch plane (68) between an open state in which the upper punch (50) and the lower punch (52) have a punch gap (75) between them, and a closed state in which the upper punch (50) and the lower punch (52) are in contact with each other, wherein the longitudinal cutting and welding device (22) further comprises an ejection upper punch (54) and an ejection lower punch (56) which are movable relative to each other in an ejection punch plane (68) parallel to the punch plane between an open position (110) and a closed position are movable,wherein the ejection upper punch (54) and the ejection lower punch (56) are arranged on a side (154) of the punch plane (68) facing away from the transport device (48), wherein the ejection upper punch (54) has a cutting element (78) for cutting the material bag (20) at least partially in the closed position, wherein the upper punch (54) has an upper punch drive (58) for driving the upper punch (54) in the punch plane (68), and wherein the lower punch (56) has a lower punch drive (57) for driving the lower punch (56) in the punch plane (68), and wherein the upper punch drive (58) is different from the lower punch drive (57). [2] Longitudinal cutting welding device according to claim 1, wherein the upper punch drive (58) drives both the upper punch (50) and the ejection upper punch (54), in particular drives them independently of each other. [3] Longitudinal cutting welding device according to claim 1 or 2, wherein the longitudinal cutting welding device (22) has a C-shaped punch frame (200), wherein the upper punch drive (58) is arranged at one end of one of the legs of the C-shaped punch frame (200) and the lower punch drive (57) is arranged at one end of the other leg of the C-shaped punch frame (200), in particular wherein the end of one leg and the end of the other leg are opposite each other. [4] Longitudinal cutting welding device according to one of claims 1 to 3, wherein the upper punch drive (58) has an upper punch drive motor, wherein the upper punch drive (58) has a camshaft to convert the rotary motion of the upper punch drive motor into a motion of the upper punch (50) in the punch plane (68). [5] Longitudinal cutting welding device according to one of claims 1 to 4, wherein the lower punch drive (57) has a lower punch drive actuator, wherein the lower punch drive (57) has at least one toggle lever to convert a movement of the lower punch drive actuator into a movement of the lower punch (52) in the punch plane (68). [6] Longitudinal cutting welding device according to claim 5, wherein the at least one toggle lever (218) is fully extended in the closed position of the upper punch (50) and the lower punch (52). [7] Longitudinal cutting welding device according to one of claims 1 to 6, wherein the ejector upper punch (54) is pivotably mounted such that the cutting element (78) can be pivoted away from the upper punch (50) and / or the transport device (48) by a pivot angle (114) from the punch plane (68). [8] Longitudinal cutting welding device according to one of claims 1 to 7, wherein the ejector top punch (54) has a housing (70), wherein the cutting element (78) is movable in the ejector plane (76) relative to the housing (70). [9] Longitudinal cutting welding device according to one of claims 1 to 8, wherein the cutting element (78) is movable between an extended position in which the cutting element (78) cuts at least section by section into the material bag or a material protrusion (82) of the material bag in the closed position, and a retracted position into the housing (70). [10] Longitudinal cutting welding device according to one of claims 1 to 9, wherein the housing (70) of the ejector upper punch (54) has at least one stripping element (98) for stripping off a material protrusion (82) of the material bag when the cutting element (78) moves from the extension position to the retraction position. [11] Longitudinal cutting welding device according to one of claims 1 to 10, wherein the transport device (48) is designed as a suction belt at least in an area (90) adjacent to the punch plane (68). [12] Longitudinal cutting welding device according to one of claims 1 to 11, wherein the longitudinal cutting welding device (22) has a support strip (102) arranged next to the transport device (48) on the side of the ejection die plane (76) for supporting a material protrusion (82) of the material bag (20). [13] Longitudinal cutting welding device according to claim 12, wherein the support strip (102) is movable perpendicular to the transport direction (T) and relative to the transport device between a support position and an ejection position located further away from the transport device (48) with respect to the support position. [14] Longitudinal cutting welding device according to claim 12 or 13, wherein the support strip (102) has a circumferential belt which forms a support surface for the material bag, wherein the support surface is movable in the transport direction. [15] Longitudinal cutting welding device according to one of claims 1 to 14, wherein an adjustment distance (100) in the ejection punch plane (76) in the open position is adjustable between the ejection upper punch (54) and the ejection lower punch (56). [16] Packaging machine for packaging goods in a material bag (20), with a longitudinal sealing device (22) according to one of claims 1 to 15, with a supply unit (16) which provides the goods (12) to the longitudinal sealing device (22) in a material bag (20) sealed on its two transverse sides (42, 44) and on at least one longitudinal side (38, 40) against a support edge (34), and with a sensor (24) which detects a width (36) of the goods (12) extending transversely to the transport direction (T) upstream of the longitudinal sealing device (22), wherein the longitudinal sealing device (22) is movable transversely to the transport direction (T). [17] Method (130) for ejecting a material protrusion (82) from a material bag (20) in a longitudinal cutting and sealing device (22) comprising a transport device (48) for conveying a packaged item (12) enclosed by the material bag (20) in a transport direction (T), an upper punch (50) and a lower punch (52), wherein the upper punch (50) and the lower punch (52) are movable relative to each other in a punch plane (68), and comprising an ejection upper punch (54) and an ejection lower punch (56) which are movable relative to each other between an open position and a closed position in an ejection punch plane (76) parallel to the punch plane, wherein the ejection upper punch (54) and the ejection lower punch (56) are arranged on a side of the punch plane (68) facing away from the transport device (48),wherein the ejector upper punch (54) has a cutting element (78) for at least partially cutting the material bag in the closed position, wherein the upper punch (54) has an upper punch drive for driving the upper punch (54) in the punch plane (68), and that the lower punch (56) has a lower punch drive for driving the lower punch (56) in the punch plane (68), and wherein the upper punch drive is different from the lower punch drive, with the following steps: - Moving (134) the upper punch (50) and the lower punch (52) towards each other until the upper punch (50) and the lower punch (52) weld the material bag (20) between them; - Driving (136) the lower punch (52) in the punch plane (68); - Driving the upper punch (50) in the punch plane (68) until the upper punch (50) and the lower punch (52) clamp a material protrusion of the material bag (20) to be expelled between them and the cutting element (78) cuts into the material protrusion (82); and - Opening (150) of the longitudinal cutting welding device (22). [18] The method of claim 17, further comprising the following steps: - Swiveling (140) the cutting element (78) of the ejector top punch (54) out by a swivel angle from the ejector punch plane (76) away from the transport device; and - Swiveling back (146) the cutting element (78) of the ejector top punch (54) by the swivel angle towards the transport device into the ejector punch plane (76). [19] Method according to claim 17 or 18, wherein the driving of the lower punch (52) in the punch plane (68) is carried out by fully extending at least one toggle lever of a lower punch drive. [20] Method according to one of claims 17 to 19, wherein the driving of the upper punch (50) in the punch plane (68) is carried out by a motor of an upper punch drive driving the upper punch (50) via a camshaft.

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