Punching device for punching out blister packs from a blister strip

Abstract

The die-cutting device for punching blister packs (1) from a blister strip (2) comprises at least a first and a second die-cutting element (5, 6). The first die-cutting element (5) has at least one die (8), and the second die-cutting element (6) has a die (14). The first die-cutting element (5) is reciprocally movable in a die-cutting direction (S) such that the die-cutting device alternately assumes an open position and a closed position. The die-cutting device further comprises at least one adjustment unit (17) assigned to each die (8), which is configured to move the die (8), in addition to moving the at least one die-cutting element (5, 6), in the die-cutting direction (S) between an operating position and an offset position such that the die (8) is positioned further away from the second die-cutting element (6) in the offset position than in the operating position.The at least one adjusting unit (17) has a force transmission element (32) which is adjustable in the punching direction (S) in order to move the punching die (8) between the operating position and the offset position.

Description

[0001] The present invention relates to a punching device for punching out blister packs from a blister tape.

[0002] The demands on quality assurance and the technical capabilities for it are constantly increasing in the field of automated product manufacturing. A paramount principle of quality assurance is to deliver only products to the customer that are free of defects and meet the agreed specifications. In the automated packaging of products in blister packs, such as tablets or other small items, it is essential that the intended number of products per blister compartment is present after automated packaging and that the backing film of the blister band and the sealing film are free of damage that could adversely affect the storage of the packaged products.

[0003] The automated packaging of products in blister packs is typically a continuous process. If a defect is detected in one process step, the affected section of the blister strip cannot be excluded from further processing in subsequent steps. At the end of the automated packaging process, filled blister packs are punched out of the blister strip, separated, and packed into folding cartons. If the defective sections of the blister strip are punched out as blister packs, a separate, subsequent rejection process is necessary. This is time-consuming and can also lead to errors.

[0004] Punching devices for blister packaging generally have two interacting punching elements. The first punching element comprises the punch(es), and the second punching element comprises a die. The punch(es) are usually moved into the die while the die remains stationary. The punch(es) and the die recesses each have the contour of the blister packaging to be punched, with the punch(es) being slightly smaller to allow for a narrow, circumferential cutting gap within the die recess. This cutting gap protects the two punching elements from wear by preventing direct mechanical contact between them. The cutting gap must be precisely adjusted to ensure that the blister packaging is sheared off the blister strip without any burrs.When a punch is moved into the die, it is guided in the punching direction by linear guides. These linear guides must have very little lateral play to the punching direction, otherwise the punch will tilt laterally beyond the tolerance of the cutting gap and come into direct contact with the die, damaging both the die and the punch.

[0005] It is an object of the present invention to overcome the aforementioned disadvantages and to provide an improved punching device that facilitates the rejection of defective sections of the blister tape and ensures precise punch guidance during the punching process.

[0006] The die-cutting device according to the invention for cutting blister packs from a blister strip comprises at least a first and a second die-cutting element, wherein the first die-cutting element has at least one, preferably several, die-cutting punches, and the second die-cutting element has a die. The first and / or the second die-cutting element is movable back and forth in a die-cutting direction such that the die-cutting device alternately assumes an open position and a closed position. The die-cutting device further comprises at least one adjustment unit associated with each die-cutting punch, which is configured to move the die-cutting punch, in addition to moving the at least one die-cutting element, in the die-cutting direction between an operating position and an offset position such that the die-cutting punch is arranged further away from the second die-cutting element in the offset position than in the operating position.The at least one adjustment unit has a force transmission element that is adjustable in the punching direction to move the punch between the operating position and the offset position.

[0007] The punching device has a simple mechanical design. The force transmission from the force transmission element of the adjustment unit to the punching die occurs directly in the punching direction.

[0008] The die-cutting device ensures selective, precise die-cutting of blister packs. This selective die-cutting process guarantees that only blister packs from the defect-free areas of the blister tape are produced. This prevents non-compliant blister packs from being mistakenly fed into subsequent packaging steps or even entering circulation.

[0009] The adjustment unit is preferably adjustable to exactly two positions. This allows the use of simple, mechanical adjustment units whose position in the punching direction does not need to be monitored or controlled.

[0010] The adjustment units allow the blister tape to be punched in the operating position, but prevent punching in the offset position, even if the associated punching element is in the punching position. This means that defective sections of the blister tape can be selectively excluded from being punched out using the adjustment units, and only those sections that are free of defects are punched out of the blister tape as blister packaging and fed into subsequent processing steps.

[0011] In a preferred embodiment, the power transmission element is pneumatically adjustable.

[0012] Advantageously, the at least one adjusting unit comprises a pneumatic cylinder, preferably a double-acting pneumatic cylinder, which includes the force transmission element in the form of a piston. The use of pneumatic cylinders as adjusting units has the particular advantage that they are easily replaceable and readily available as standardized spare parts.

[0013] In general, the power transmission element can be a piston, a spindle, or a pin.

[0014] In a preferred embodiment, the stroke of the force transmission element deviates in magnitude by a maximum of 20%, preferably by a maximum of 10%, particularly preferably by a maximum of 5%, and even more preferably not at all, from the offset height of the associated punch between the operating position and the offset position. This keeps the design as simple as possible.

[0015] Preferably, the at least one adjustment unit is arranged in the punching direction between a lifting table of the punching device and a base plate of the first punching element.

[0016] The at least one adjustment unit can preferably be attached to or integrated into a lifting table of the punching device.

[0017] Preferably, the stroke of the first punching element between the open position and the closed position of the punching device is between 20 mm and 50 mm.

[0018] Preferably, the offset height caused by the movement of the adjusting unit between the operating position and the offset position of a punch is between 5 mm and 10 mm.

[0019] In a preferred embodiment, the punching device has a plurality of adjustment units arranged one behind the other in the direction of the strip travel and / or next to each other perpendicular to the direction of the strip travel.

[0020] In a further advantageous design, each adjustment unit can be controlled individually. This measure makes it possible to adjust the height of only individual punches. It is also conceivable to control the adjustment units in groups if several adjustment units are assigned to one punch.

[0021] In a preferred embodiment, the at least one adjustment unit is detachably connected to the first punching element. This has the advantage that the adjustment units can be replaced individually and that they are generally independent of the tool's life cycle. Furthermore, this reduces the weight and dimensions of the first punching element.

[0022] In an advantageous further development, at least one adjustment unit remains in the stamping device during a tool change of the stamping elements.

[0023] It is advantageous if the detachable connection includes a T-slot or dovetail groove in the area of ​​the first punching element and a corresponding extension of the adjustment unit. This allows the adjustment unit to be moved while connected to the first punching element, or vice versa.

[0024] The extension of the adjusting unit can be a T-slot nut, a slide or a bolt that engages positively with the T-slot or dovetail groove.

[0025] In a preferred embodiment, the T-slot or dovetail groove runs perpendicular to the strip direction and the first punching element is displaceable relative to the at least one adjustment unit in a direction perpendicular to the punching direction and perpendicular to the strip direction.

[0026] The die-cutting device according to the invention is typically used in a blister packaging machine. Blister packaging machines generally comprise a forming station for forming the blister cavities in a forming film, a filling station for filling the formed blister cavities with products, a sealing station for sealing a cover film onto the forming film web filled with products, and a die-cutting device.

[0027] The invention will be explained in more detail below with reference to drawings. Fig. 1 is a sectional view, perpendicular to the belt direction, of a first embodiment of the punching device according to the invention in an open position; Fig. 2 is a sectional view, perpendicular to the belt direction, of the punching device made of Fig. 1in a closed punching position, with two punching dies in an offset position in which they do not come into contact with the blister tape; Fig. 3 is a sectional view, in the tape travel direction, of the punching device along section line AA. Fig. 2 Fig. 4 is a sectional view, perpendicular to the belt direction, of a second embodiment of the punching device according to the invention in an open position; Fig. 5 is a sectional view, perpendicular to the belt direction, of the punching device made of Fig. 4 , in which an adjustment unit for a punch is adjusted horizontally; Fig. 6 is a sectional view, in the band travel direction, of the punching device according to section line BB. Fig. 5 Fig. 7 is a sectional view, in the direction of band travel, of the punching device according to section line BB. Fig. 5, however, during a punching stroke of the punching device; Fig. 8 is a sectional view, perpendicular to the strip travel direction, of a third embodiment of the punching device according to the invention in an open position; Fig. 9 is a sectional view, perpendicular to the strip travel direction, of details of an embodiment of the punching device according to the invention; Fig. 10 is a sectional view, in the strip travel direction, along the section line CC from Fig. 9 ; and Fig. 11 is a front view of a stamp package made of Figs. 9 and 10 with the associated cylinder liners.

[0028] Fig. 1 shows a first embodiment of a stamping device according to the invention for selectively stamping blister packaging 1 (see Fig. 2) from a blister strip 2 in an open position. The punching device comprises a drive 4, a lifting table 3, and a first and a second punching element 5, 6. In the illustrated example, the first punching element 5 is arranged below the second punching element 6. However, this can also be reversed. Furthermore, it is conceivable that the punching device is oriented at an angle or horizontally.

[0029] The lifting table 3 is driven by a drive 4 of the punching device with a predetermined stroke H1 ( Fig. 2 The first punching element 5 is continuously moved back and forth in a punching direction S to generate a defined punching motion. The punching device constantly switches between an open position and a closed position in which the punching can take place.

[0030] Here, the lifting table 3 transfers the movement to the first punching element 5, so that the punching dies 8 of the first punching element 5 move relative to the second punching element 6. The stroke H1 is generally typically between 20 mm and 50 mm.

[0031] The lifting table 3 and the first punching element 5 have guides aligned with each other to guide the lifting table 3 together with the first punching element 5 in a continuous back-and-forth movement in the punching direction S relative to the second punching element 6. The guides of the lifting table 3 and the first punching element 5 each have bushings 15 that are guided along the guide columns 16, which are fixedly connected to the second punching element 6 and a machine frame (not shown) of the punching device. More precisely, guide columns 16 are arranged in corner regions of the second punching element 6, which first penetrate the bushing 15 of the base plate 25 of the first punching element 5 and then the bushing 15 of the lifting table 3. Due to the common guidance of the lifting table 3 and the first punching element 5 along the guide columns 16, they are precisely aligned with the second punching element 6 and guided with sufficient rigidity.The guide columns 16 and the bushings 15 are dimensioned in such a way as to prevent the lifting table 3 and the first punching element 5 from tilting.

[0032] The lifting table 3 and the first punching element 5 are rigidly connected, so that the stroke H1 of the drive 4 is completely transferred to the first punching element 5. Accordingly, the stroke H1 of the drive 4 is equal to the stroke of the lifting table 3 and the first punching element 5.

[0033] In the example shown, the second die-cutting element 6 is stationary. However, it is also conceivable that both die-cutting elements 5 and 6 move relative to each other, or that only the second die-cutting element 6 moves relative to the first, stationary die-cutting element 5.

[0034] The first punching element 5 has a base plate 25 and a plurality of punch packages 9, which move back and forth together with the first punching element 5 and accordingly with the lifting table 3 and the base plate 25 of the first punching element 5.

[0035] The punch assemblies 9 each comprise a punch 8, punch guides 12, and an actuating plate 10. The punch guides 12 penetrate the base plate 25 of the first punching element 5 along the punching direction S, with the punch 8 and the actuating plate 10 being arranged on opposite sides of the base plate 25 of the lower punching element 5 in the punching direction 10. Furthermore, the punch assembly 9 includes a punch support plate 11 between the punch guides 12 and the punch 8. The punch guides 12 are formed, for example, by guide columns which, in conjunction with bushings 13 in the base plate 25, form a linear guide.

[0036] The punch 8 is detachably attached to the punch carrier plate 11 by force-fit and / or form-fit. The punch guides 12 are connected to the punch carrier plate 11 on the side facing away from the punch 8. In an embodiment not shown, the punch carrier plate 11 can be omitted, so that the punch guides 12 are directly connected to the punch 8.

[0037] Each bushing 13 is fixed in the base plate 25 of the first punching element 5 and enables linear movement of the punch assembly 9 along the punch guide 12 in the punching direction S. In this embodiment, the punch assemblies 9 are each provided with four punch guides 12, which are arranged in the corner regions of the punch carrier plate 10 and the actuating plate 10, respectively. This arrangement allows the punch guides to provide precise guidance of the punch assembly 9. Furthermore, any number of punch guides can generally be provided for each punch assembly 9 to improve the guidance of the punch 8.

[0038] The second punching element 6 has a band guide which is designed to feed a filled and sealed blister band 2 in a clocked manner in the feed direction or band travel direction F (see Fig. 3) to lead. The second die-cutting element 6 has a die 14 with recesses that interacts with the associated die-cutting punches 8 of the first die-cutting element 5. In addition, dispensing openings are provided on the side of the die facing away from the first die-cutting element 5, which allow the die-cut blister packs 1 to be removed from the die-cutting device. The removal of the die-cut blister packs 1 is in Fig. 2 and 3 The diagram is shown schematically only. A transfer device (not shown) can be used for removal, which transfers the blister packs 1 to downstream processing equipment, for example, a transport device for the blister packs 1. For this purpose, the transfer device can, for example, have individually controllable suction grippers that grip the lid film of the blister packs 1.

[0039] The die 8 is guided precisely into the die 14 of the second die-cutting element 6 by means of the multiple die guides. Furthermore, the die guides prevent the die 8 from tilting in the die 14. The number of die guides in each die set 9 can be selected to suit the die-cutting format and the dimensions of the die 8.

[0040] The first punching element 5 and the lifting table 3 are spaced apart from each other in the punching direction S, creating a free space between them. Adjustment units 17 are provided in the space between the lifting table 3 and the first punching element 5. These units can be adjusted by an offset height H2, thus allowing each punch assembly 9 or each punch 8 to be adjusted in the punching direction S by this offset height H2. For this purpose, each adjustment unit 17 is appropriately connected to the punch carrier plate 10 and the lifting table 3. The punching force is transmitted from the lifting table 3 to the respective punch assemblies 9 or punch 8 via the adjustment units 17. The offset height H2 is typically between 5 mm and 10 mm.

[0041] Each adjustment unit 17 can be individually controlled, so that each punch set 9 or each punch 8 can be moved by the predetermined offset height H2 from an operating position (punch 8 is extended) to a retracted offset position (punch 8 is retracted). The adjustment units 17 are designed as, preferably double-acting, pneumatic cylinders with a force transmission element 32 in the form of a piston. In alternative embodiments, they can also be designed as hydraulic cylinders, solenoids, or similarly acting mechanical, electrical, or fluidic adjustment units.

[0042] The adjusting units 17 must selectively adjust the punching dies 9 due to the continuous movement of the drive 4 during the recurring stroke H1. The adjustment must be synchronized with the drive 4 of the punching device so that the adjustment of the adjusting units 17 to the offset position takes place within a predetermined stroke range in the punching direction S, in which no contact with the blister strip 2 can occur, regardless of the position of the punch assembly 9 or the punching die 8.

[0043] The adjustment of the adjustment units 17 is initiated by a control unit of the packaging machine (not shown), into which the punching device according to the invention is integrated. The control unit is further coupled to a quality assurance system of the packaging machine. If the quality assurance system detects defects in a section of the blister strip 2 (e.g., incomplete filling of the blister cavities), the control unit initiates an adjustment of the punch assembly 9 or the punch 8 to the offset position. As a result, the corresponding defective section of the blister strip is not punched out of the blister strip 2 in the form of blister packs 1, but remains within it. The remaining grid of the blister strip 2 containing the defective blister packs 1' is subsequently disposed of.

[0044] In Fig. 1The left punch assembly 9 is in the operating position, while the middle and right punch assemblies 9 are in the retracted offset position. In this embodiment, the offset of the punch assemblies 9 in the punching direction S is defined by the distance between the punch carrier plate 11 and the actuating plate 10 and the thickness of the base plate 25 or the height of the bushings 13 of the first punching element 5 in the punching direction S. Depending on the constraints, the offset height H2 can be adjusted by design.

[0045] According to the present embodiment, the punch assembly 9 or the punch 8 is adjusted exclusively between two positions: the operating position and the offset position. No punching is performed when the punch assembly 9 is in the offset position, and punching is performed when the punch assembly 9 is in the operating position.

[0046] Fig. 2This illustrates the connection. The punching device is shown therein. Fig. 1 in a closed position in which, depending on the positioning of the stamp package 9 or the punch 8, a blister pack 1 is selectively punched out of the blister tape 2 or not.

[0047] It is further provided that the first and second punching elements 5, 6 are interchangeable, with the lifting table 3 and the adjustment units 17 remaining in the punching device when the punching elements 5, 6 are changed.

[0048] Fig. 3 represents a sectional view along the section line AA according to Fig. 2The cutting edge of the punch 8 penetrates the blister tape 2 in the punching direction S, so that a blister pack 1 is punched out and can be removed from the punching device. It can also be seen that two adjustment units 17 are arranged one behind the other in the tape travel direction F of the blister tape 2, which jointly adjust a punch package 9 or a punch 8 in the punching direction S.

[0049] In an embodiment not shown, it is also conceivable to arrange several punch packs 9 one behind the other in the direction of belt travel in order to increase the punching capacity of the punching device.

[0050] In general, different die-cutting elements 5, 6 can be used in a die-cutting device, depending on the blister packaging format. One or more adjustment units 17 can be assigned to a punch package 9. It is advantageous if the adjustment units 17 are dimensioned such that they do not exceed the size of the smallest blister packaging format to be processed.

[0051] The adjustment units 17 therefore preferably have a width and / or length of no more than 60 mm perpendicular to or in the direction of band travel. The height of the adjustment units 17 themselves is selected to be as small as possible in the punching direction S in order to reduce the overall height of the punching device. The height of an adjustment unit 17 is generally typically between 70 mm and 90 mm.

[0052] Fig. 4 A second embodiment of the stamping device according to the invention is presented as a modification of the first embodiment. Fig. 1This embodiment of the punching device has many identical features to those previously described in relation to the first embodiment. Identical reference numerals denote identical elements.

[0053] Therefore, the following discussion will focus only on additional features or features that differ from the first embodiment.

[0054] In Fig. 4 Four adjustment units 17 are provided, which can be adjusted in a direction perpendicular to the tape travel direction F and perpendicular to the punching direction S, in order to allow adaptation to different formats of the blister tape or blister packs. The adjustment units 17 are preferably adjusted in the direction perpendicular to the tape travel direction F and perpendicular to the punching direction S such that they are arranged symmetrically with respect to the punching dies 8.

[0055] In Fig. 4On the right side, an adjustment unit 17 can also be seen, which is in a parked position and is not interacting with a punch pack 9. Depending on the number and size of the punch packs 9 or the die-cutting punches 8, there may be zero, one, or multiple adjustment units 17 in the parked position. This allows, for example, a four-lane die-cutting device to punch a three-lane blister strip 2 when a punch pack 9 is in the parked position.

[0056] In this embodiment, the adjustment of the adjustment units 17 in the direction perpendicular to the strip travel direction F and perpendicular to the punching direction S is effected by means of spindles 18, which interact with horizontally displaceable slides 19. One spindle 18 is provided for each slide. However, two slides 19 can also be adjusted with the same spindle if they belong to the same punch 8. The slides 19 themselves are guided in the lifting table 3 by means of a linear guide, such as a dovetail or T-slot guide, transverse to the strip travel direction. The linear guide of the slides 19 holds them immovably in the punching direction S, while movement is possible in a direction perpendicular to both the strip travel direction and the punching direction. Each slide 19 is assigned to an adjustment unit 17, so that each adjustment unit 17 can be adjusted individually or several adjustment units 17 together can be adjusted by means of the spindle drive.

[0057] In Fig. 5 The diagram shows how the spindles 18 are connected to the slides 19. The spindles 18 pass through through holes in the slides 19. Without further action, they do not engage with each other. The assignment of a spindle 18 to a specific slide 19, and thus the engagement of the spindle 18 with that slide 19, is ensured by inserting a threaded segment 21 into the through hole. When the spindle 18 is rotated, the rotation of the spindle 18 is then transferred to the slide 19, causing the slide 19 to move. The threaded segments can preferably be threaded bushings.

[0058] The spindle 18 can be driven manually, for example by means of a hand crank, or by a motor. In particular, each spindle 18 can be assigned a separate drive 20, for example in the form of an actuator, which enables precise, preferably controlled, adjustment of the respective adjustment units 17. Furthermore, a drive 20 can also be assigned to a plurality of spindles 18. In this case, it is necessary to decouple the drive 20 from one spindle 18 and couple it to another spindle 18.

[0059] If each spindle 18 is assigned a separate drive 20, the drives 20 are rigidly connected to the lifting table 3 and move back and forth with it in the punching direction during punching operation. If one drive 20 is assigned to several spindles 18, the drive 20 is preferably attached to a machine frame of the punching device and is adjustable horizontally and / or vertically relative to this frame or the lifting table 3 by means of an adjustment device (not shown).

[0060] In principle, the adjustment units 17 with their associated slides 19 are adjusted when the punching device is at a standstill and not during punching operation, usually when changing the punching elements 5, 6. When changing the punching elements 5, 6, the adjustment units 17 together with the slides 19 as well as the spindles 18 remain connected to the lifting table 3.

[0061] Figs. 6 and 7 Each shows the lower punched element 5 along the cutting line BB. Fig. 5in the open position and in the closed punching position. In both figures, however, the punch package 9 or the punch 8 is in the offset position that prevents a blister pack 1 from being punched out of the blister tape 2. In further comparison between Fig. 6 and Fig. 7 It can be seen that two drives 20 are arranged one behind the other in the direction of belt travel.

[0062] In Fig. 6 are the two drives 20 assigned to the two upper spindles 18, while in Fig. 7 The two drives 20 are assigned to the two lower spindles 18. The drives 20 remain in the same position in the punching direction S, while the lifting table 3 including the first punching element 5 moves. Fig. 7 in the punching direction S is moved manually upwards, which is why the two drives 20 can also be coupled to the two lower spindles 18.

[0063] Between the two states of Fig. 6 and Fig. 7The drives 20 must be decoupled from the lower spindles 18 and then coupled back to the upper spindles 18. This can be accomplished using suitable couplings (not shown). Horizontal adjustment of the drives 20 to couple and decouple them from the respective spindles 18 is also conceivable.

[0064] Figs. 6 and 7 further show that in the band travel direction F, two adjustment units 17 are assigned to a punch package 9 and are arranged symmetrically in relation to the punching die 8. In addition, the Figs. 6 and 7Two T-slots 22 are arranged in the actuating plate 10 perpendicular to the strip direction F, which interact with corresponding extensions 30 of the adjusting units 17 and thus form a positive-locking connection in the punching direction S. Furthermore, the T-slots 22 allow the adjusting units 17 to be adjusted transversely to the strip direction, while the actuating plate 10 of the punch assembly 9 is connected to the adjusting units 17.

[0065] Instead of a T-slot 22, another linearly displaceable, positive-locking connection can also be provided, such as a dovetail guide, whereby the extension 30 of the adjusting unit 17 is also designed according to the selected connection. The positive-locking connection of the adjusting unit 17 with the punch assembly 9 by means of the T-slot 22 and the extension 30 of the adjusting unit 17 ensures the force transmission from the lifting table 3 via the adjusting unit 17 in the tensile and compressive directions to the punch assembly 9 in the punching direction S.

[0066] Fig. 8 shows a further modification of the embodiment of Figs. 1 to 3 As before, only additional features or features that differ from this embodiment will be discussed. For all other features, please refer to the description in [reference to be inserted here]. Fig. 1 or Fig. 4 referred.

[0067] In Fig. 8Two adjustment units 17 are assigned to a punch set 9 and a punch die 8, respectively, in a direction perpendicular to the belt travel direction F. The adjustment units 17 are arranged symmetrically to the punch set 9 to ensure precise guidance of the punch set 9.

[0068] Figs. 9 and 10 Figure 1 shows a detailed view of a further embodiment of a stamping device according to the invention, which is a further development of the embodiments described above. Again, only the additional features are discussed.

[0069] Fig. 9Figure 1 shows a first punching element 5 with a punch assembly 9. An elastic element 23 is provided between the punch carrier plate 11 and the base plate 25 of the first punching element 5. The elastic element 23 is shown here specifically as a coil spring, which is mounted in a recess in the base plate 25 and bears against the punch carrier plate 11. The elastic element 23 pre-tensions the punch assembly 9 into the operating position. This causes the actuating plate 10 to be pressed against a lower surface of the base plate 25 of the first punching element 5 in the punching direction S.

[0070] The contact of the actuating plate 10 with the underside of the base plate 25 simultaneously enables the alignment of the punch assembly 9 in the operating position. Several elastic elements 23 can also be provided between the punch carrier plate 11 and the base plate 25 of the first punching element 5 to exert a desired, distributed preload force on the punch assembly 9.

[0071] The underside of the base plate 25 of the first punching element 5 can additionally feature specially manufactured punch package stops 24, which, in the pre-tensioned state, come into contact with the actuating plate 10. These punch package stops 24 can make contact with the actuating plate 10 as line contacts and / or point contacts. Furthermore, the punch package stops 24 can be made of a different material than the actuating plate 10 and can be integrated into the base plate 25 of the first punching element 5, for example, in a recess. This allows for an optimized material pairing between the punch package stops 24 and the actuating plate 10, because the material of the punch package stops 24 can be different from the material of the base plate 25.

[0072] The punch assembly stop 24, or the stop surface of the base plate 25 of the first punching element 5, together with the actuating plate 10, ensures precise alignment of the punch 8 in a direction perpendicular to the strip travel direction, in the strip travel direction F, and in the punching direction S. The cutting gap between the punch 8 and the die 14 is typically in the micrometer range, which is why it is extremely important to prevent tilting of the punch assembly 9 or the punch 8 to protect the punching elements 5 and 6 from damage. The actuating plate 10, the punch assembly stops 24, and the elastic elements 23 for pre-tensioning the punch assembly 9 further stiffen the punch assembly 9 in the operating position for this purpose.

[0073] Furthermore, the elastic elements 23 also help to transmit the punching force, thus relieving some of the stress on the adjusting units 17 during punching in the operating position. However, when adjusting the punch assembly 9 to the offset position, the restoring force of the elastic elements 23 must be overcome by the adjusting units 17. The preloading of the punch assemblies 9 by means of elastic elements 23 also ensures that the punch assemblies 9 are always in the operating position when the adjusting units 17 are out of operation or not connected to the punch assemblies 9, for example, when changing the punching elements 5, 6 or in the event of a defect in the adjusting units 17 themselves.

[0074] Fig. 10 is a section view along the section line CC from Fig. 9The actuating plate 10 has two T-slots 22 extending transversely to the belt direction. The T-slots 22 extend completely across the width of the actuating plate 10.

[0075] Fig. 11 This is an enlarged view of stamp set 9 from Figs. 9 and 10 in a front view.

[0076] The in Figs. 9 to 11 The illustrated stamp packages 9 can be used in any of the embodiments described above.

[0077] The power transmission element 32 can generally also be designed as a pin or spindle adjustable in the punching direction S.

[0078] The stamping elements 5, 6 are usually connected in such a way that they are referred to together as a stamping tool and are also provided as a spare part in this form.

[0079] Finally, it should be noted that features of the individual embodiments can be combined.

Claims

1. A die-cutting device for punching blister packs (1) from a blister strip (2), wherein the die-cutting device has at least one first and one second die-cutting element (5, 6), wherein the first die-cutting element (5) has at least one, preferably several, die-cutting punches (8) and the second die-cutting element (6) has a die (14), wherein the first and / or the second die-cutting element (5, 6) is movable back and forth in a die-cutting direction (S) such that the die-cutting device alternately assumes an open position and a closed position, wherein the die-cutting device further comprises, for each die-cutting punch (8), at least one adjustment unit (17) associated with the die-cutting punch (8), which is configured to move the die-cutting punch (8), in addition to the movement of the at least one die-cutting element (5, 6), in the die-cutting direction (S) between an operating position and an offset position, such thatthat the punch (8) is arranged further away from the second punching element (6) in the offset position than in the operating position, wherein the at least one adjusting unit (17) has a force transmission element (32) which is adjustable in the punching direction (S) in order to move the punch (8) between the operating position and the offset position.

2. Punching device according to claim 1, characterized by the fact that the power transmission element (32) is pneumatically adjustable.

3. Punching device according to claim 2, characterized by the fact that the at least one adjusting unit (17) has a pneumatic cylinder, preferably a double-acting pneumatic cylinder, which includes the power transmission element (32) in the form of a piston.

4. Punching device according to claim 1, characterized by the fact that the power transmission element (32) is a piston, a spindle or a pin.

5. Punching device according to one of the preceding claims, characterized by the fact thata stroke of the force transmission element (32) deviates in its amount by a maximum of 20%, preferably by a maximum of 10%, particularly preferably by a maximum of 5%, from an offset height (H2) of the associated punching die (8) between the operating position and the offset position.

6. Punching device according to one of the preceding claims, characterized by the fact that the at least one adjustment unit (17) is arranged in the punching direction (S) between a lifting table (3) of the punching device and a base plate (25) of the first punching element (5) and is preferably attached to or integrated into the lifting table (3) of the punching device.

7. Punching device according to one of the preceding claims, characterized by the fact that The stroke (H1) of the first punching element (5) between the open position and the closed position of the punching device is between 20 mm and 50 mm.

8. Punching device according to one of the preceding claims, characterized by the fact thatan offset height (H2) between the operating position and the offset position of a punch (8) caused by the movement of the adjusting unit (17) is between 5 mm and 10 mm.

9. Punching device according to one of the preceding claims, characterized by the fact that it has a plurality of adjustment units (17) arranged one behind the other in the direction of belt travel (F) and / or perpendicular to the direction of belt travel (F) next to each other.

10. Punching device according to one of the preceding claims, characterized by the fact that Each adjustment unit (17) can be controlled individually.

11. Punching device according to one of the preceding claims, characterized by the fact that which at least one adjustment unit (17) is detachably connected to the first punching element (5).

12. Punching device according to claim 11, characterized by the fact that which at least one adjustment unit (17) remains in the punching device during a tool change of the punching elements (5, 6).

13. Punching device according to claim 11 or 12, characterized by the fact that the detachable connection comprises a T-slot (22) or dovetail groove in the area of ​​the first punching element (5) and a corresponding extension (30) of the adjustment unit (17).

14. Punching device according to claim 13, characterized by the fact that the T-slot (22) or dovetail groove runs perpendicular to the strip direction (F) and the first punching element (5) is displaceable relative to the at least one adjustment unit (17) in a direction perpendicular to the punching direction (S) and perpendicular to the strip direction (F).

15. Blister packaging machine with a punching device according to one of the preceding claims.

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