EP1196268A1

EP1196268A1 - Device for die cutting a stack consisting of sheet-type materials

Info

Publication number: EP1196268A1
Application number: EP01943367A
Authority: EP
Inventors: Helmut Gross; Werner Bauer; Gerhard Becker; Gerd Gottschalk; Richard Neubauer; Horst Schneider; Horst Stemmer
Original assignee: Adolf Mohr Maschinenfabrik GmbH and Co KG
Current assignee: Adolf Mohr Maschinenfabrik GmbH and Co KG
Priority date: 2000-05-17
Filing date: 2001-05-15
Publication date: 2002-04-17
Anticipated expiration: 2021-05-15
Also published as: DE50100206D1; US6959634B2; EP1196268B1; DE50103297D1; WO2001087556A1; US20040011181A1; ATE255987T1; US20020189416A1; US6880443B2; US20040144228A1; AU6596201A; US6755106B2; AU7241101A; EP1196271A1; EP1196270A1; EP1196271B1; WO2001087557A1; EP1196270B1; WO2001087554A1; WO2001087555A1

Abstract

The invention concerns a device for die-cutting a stack of sheet-like materials, particularly labels, whereby the stack is pressed into the die-cutter blade by a relative movement of a punching ram and a hollow cylindrical die-cutter blade. For a device such as this, it is proposed that the die-cutter blade 18 is adjustably held in a frame 16 , and the frame 16 is accommodated by a receiving apparatus 13 which is mounted in a punch platen 12 and is adjustable relative to it, whereby the frame 16 can be slid in a plane parallel to the punch platen 12 , in particular is adjustable in the direction of two major axes that are essentially arranged perpendicular to one another, and can also be tilted out of the plane. Such a device allows for precise orientation of the die-cutter blade relative to the stack to be punched.

Description

Direction for punching a stack of leafy material

Description

The invention relates to a north device for punching a stack which is formed from leafy material, in particular a north device for punching a stack of labels. In such a device, the stack is pushed into the punch knife by a relative movement of the punch and a hollow cylindrical punch knife. During the actual punching process, the punch knife is usually stationary, while the punch press pushes the stack into the punch knife. A direction of the aforementioned type is known from WO 96/12593. The essence of the punching device described there is seen in the fact that an additional counter pressure stamp is provided, which serves the purpose of moving the punched stack out of the punching knife against the direction of insertion.

It is an object of the present invention to provide a punching device which, due to a special arrangement and mounting of the punching knife, is very compact in the direction of the relative movement of the punching stack and punching knife.

The invention proposes a device for punching a stack of leafy material, as defined in claim 1. It is essential in this device that the punching knife is adjustably held in a frame which can be inserted perpendicularly to the relative travel direction of the punch and punching knife into a receiving device and can be fixed in a centered position, the receiving device being mounted in a punching head plate so as to be relatively adjustable relative to it. The frame that receives the punching knife is thus not folded into the receiving device, which would require a relatively large amount of space between the punch and the punching head plate. Rather, the device is very compact because the frame can be positioned in the narrowest space between the punch and the punching head plate by being inserted into the receiving device instead, perpendicular to the relative travel direction of the punch and punch. The frame can be fixed there in a centered position, which presets the frame relative to the punching head plate. The frame and thus the punching knife can be further adjusted in that the receiving device is adjustable in the punching head plate.

Advantageous embodiments of the device according to the invention are described in the subclaims:

The frame can be guided in a particularly simple manner in the removal device if it has two strips arranged in parallel, between which the frame can be inserted. The frame itself is preferably adjustable in a plane parallel to the punching head plate, in particular adjustable in a superimposed manner in two main axis directions arranged substantially perpendicular to one another, and pivotable in this plane. So that the frame can follow the movement of the receiving device centered, it is, for example, with a groove running essentially in a main axis direction, into which a centering pin which can be moved essentially in the other main axis direction and which is in particular mounted in the punching head plate is inserted. The receiving device and / or the centering bolt are expediently adjustable by motor, the adjustment preferably taking place synchronously. Electric motors are particularly suitable as actuators. In order to fix the frame in the set position in the receiving device, a clamping element is provided in particular. This fixation and or the fixation of the frame in the centering pin is preferably done pneumatically.

The aforementioned designs of the device ensure that the punch knife held in the frame and inserted into the device can be aligned in a defined manner with respect to the punch to be stacked, in particular in a plane perpendicular to the relative travel direction of the punch and punch, both under translational and rotary Aspect.

Another advantageous embodiment of the device relates to the presetting of the punching knife in the frame. It is essential in this device that the frame is equipped with tensioning elements mounted in it, adjustable and fixable relative to the frame, for fixing the punching knife, and an adjusting element mounted in the frame is provided for the aligned alignment of at least one alignment edge of the adjusting element with a knife-edge section of the punching knife before fixing the set clamping elements.

It is therefore not necessary to fix the punching knife in the frame by feeling, but it is done by means of a separate adjusting element. It is sufficient to use a particularly straight knife-edge section of the punching knife as a reference variable, which is to be brought into alignment with an alignment edge of the adjusting element. This setting element is placed at a defined point on the frame, so that the exact setting position of the cutting knife relative to the frame is ensured when the alignment edge of the setting element and the knife-edge section of the punching knife are aligned. The lateral alignment of the punching knife relative to the frame can be done in a simple manner by means of a center marking which is attached to the punching knife on the one hand and to the frame on the other and is also to be brought into alignment. The setting element can be designed in different ways. The setting is particularly simple in terms of construction element if it is designed as an emblem. This rod-shaped element is placed on the frame in a defined manner and the punching knife is aligned on the one alignment edge of the setting ruler. The setting ruler is preferably arranged at a short distance behind the punching knife, based on the leading knife edge of the punching knife. It is also conceivable to align the punch knife not only along a section of the knife edge, but along the entire knife edge. This can be accomplished in a simple manner if the adjusting element is designed as an adjusting foil which is arranged parallel to the circumferential knife edge of the punching knife and which is provided with an opening corresponding to the opening cross section of the punching knife in the area of the knife edge. The adjusting film is arranged, for example in front of the punching knife, in relation to the leading knife edge of the punching knife, and is aligned with the frame. The punching knife is then positioned so that its circumferential knife edge matches the opening contour of the film opening. This configuration considerably simplifies the presetting of the punching knife in the frame, so that when the frame is inserted into the punching device, only minor position corrections of the punching knife or frame with respect to the punching stamp and the stack to be punched are required, if this is the case at all.

A further training relates to the special fixation of the punch knife in the frame. It is essential here that tensioning elements mounted in the frame, adjustable and fixable relative to them, are provided for fixing the punching knife. The frame has a frame part and a first clamping bar, which is displaceable and fixable in the frame part, the punching knife being held in the first clamping bar and the frame part, in a section of the frame part which is arranged parallel to the first clamping bar. A second clamping beam is arranged parallel to the first clamping beam and is displaceable and fixable in the frame part. Finally, clamping means are provided for clamping the first and second clamping bars in such a way that the first clamping bar can be clamped against the punching knife.

The task of the frame part and the first clamping beam is thus to accommodate the clamping elements for fixing the punching knife. These tensioning elements, which are designed in particular as clamping claws, fix the tensioning knife on sides of the punching knife facing away from one another, so that, under the action of the tensioning means of the second tensioning bar, the tensioning elements of the first tensioning bar into the tensioning elements of the frame pushes. After the clamping elements for the punching knife have been largely positioned and prestressed and the first clamping bar, which is slidably mounted in the frame, is also held relatively firmly, but still slightly displaceable in the frame, the second clamping bar, which is also displaceable in the frame, is positioned close to the first clamping bar and tight tightened. By adjusting the clamping means, which contact the first clamping bar, the punching knife is fixed tightly between the clamping elements via the slight displacement of the first clamping bar. The tight connection between the first clamping beam and the frame is then established, with which the punching knife is held particularly firmly in the frame.

The frame is preferably designed to be closed and therefore rigid. The connection between the first and / or second clamping beam and the frame part can be positive or frictional. According to a special design, it is provided that the first and / or second clamping beam can be connected to the frame part in a form-fitting manner along wedge-shaped bearing sections, the wedge of the respective bearing section expanding away from the punching knife. As a result of these wedge-shaped bearing sections, it is ensured that the connection of the tensioning beam and the frame cannot come loose during operation. The same applies to the connection of clamping elements and clamping beams or frames, if the clamping elements are also provided with correspondingly wedge-shaped bearing sections.

Another design relates to the special support of the frame on the punching head plate and the direct introduction of force of the punching forces from the punching knife via the frame area assigned to the punching knife into the punching head plate. The punch knife is adjustably held in the frame which is held in the receiving device which is connected to the punch head plate. The mounting plate has the two parallel strips, between which the frame is held. The frame has a frame part and at least one clamping bar adjustable in the frame part for fixing the punching knife. The clamping bar lies on the punching head plate in the region of its ends, and the distance of the frame part, which serves to accommodate the punching knife, lies on the punching head plate. The section of the frame part facing away from this section of the frame part is arranged at a distance from the punching head plate. The force of the punching forces is introduced via the frame part in the area of that section of the frame part which serves to hold the punching knife, and also via the clamping bar which is adjustable in the frame and which is arranged in the immediate vicinity of the punching knife. 5.1

Depending on which punching knife size is used, the mounting of the punching knife is adjusted by moving the clamping bar, which ensures that the punching forces are always introduced into the punching head plate in the immediate vicinity of the punching knife. The force is therefore not applied in the area of that section of the frame part that faces away from the punching knife.

6

According to an advantageous development, an additional tensioning element is provided which acts on the section of the frame part which faces away from the punching knife, in such a way that the frame part is pressed against the bar which is arranged in the region of the punching knife.

The punching device according to the invention can be designed differently taking into account the features of the preambles of the claims. In the sense of the document WO 96/12593 discussed, it is not necessary for a counterpressure stamp which generates counterpressure on the stack to be effective within the punching knife. As a rule, the so-called punch punching will be used, in which the stack of pre-cut labels, in particular rectangular labels, is pressed through a punch knife in one stroke. The punched labels are automatically pushed through the punch knife through the subsequent stack.

Further features of the invention are shown in the subclaims, the description of the figures and the figures themselves. It is noted that all individual features and all combinations of individual features are essential to the invention.

In the figures, a punching device, which works on the principle of piercing punching, is shown schematically, without being limited to the embodiment shown or the modifications illustrated in this context. It illustrates schematically:

FIG. 1 shows a side view of the punching machine according to the invention,

FIG. 2 shows an enlarged side view of the area of the actual punching device shown in FIG. 1,

FIG. 3 shows a view Z according to FIG. 2 of the punching device and the device for feeding the stacks to be punched,

4 shows a section along the line B-B in Figure 2, but before the onset of the

Punching knife receiving frame in the receiving device,

FIG. 5 shows a representation according to FIG. 4, but with the frame centered in the receiving device,

Figure 6 is a section along the line A-A in Figure 3, illustrated for the state of

Inserting the frame into the receiving device, 7 shows a section according to FIG. 6, illustrating the state of the subsequent insertion of the frame into the receiving device,

FIG. 8 shows a section according to FIGS. 6 and 7, illustrated for the state of centering the frame,

FIG. 9 shows a section along lines 6 to 8, illustrating the state in which the frame is fixed in the punching head plate,

FIG. 10 is an enlarged view of the frame with punching knife shown in FIGS. 4 and 5,

FIG. 11 shows a design of the. Modified compared to the embodiment according to FIG

Frame with a punch knife picked up by it, in a plan view,

FIG. 12 shows a section through the frame shown in FIG. 11,

FIG. 13 shows a detailed illustration of a modified, form-fitting connection of the frame and the tensioning beam,

14 shows a section along the line E-E in Figure 3 to illustrate the storage of the

Punch knife in the punch head plate,

FIG. 15 shows a side view of the frame and the punching knife accommodated by it, as well as an adjusting ruler used,

FIG. 16 is a top view of the arrangement shown in FIG. 15,

FIG. 17 shows a top view according to FIG. 16, but using an adjusting foil used for setting the punching knife,

FIG. 18 shows a side view of the arrangement shown in FIG. 17,

FIG. 19 shows a view X according to FIG. 3 to illustrate the height adjustment of the punching knife using a sensor,

FIG. 20 shows a view X according to FIG. 3 to illustrate the height adjustment of the punching knife by means of a position measuring system,

FIG. 21 shows a view X according to FIG. 3 to illustrate the arrangement and configuration of a label extractor,

FIG. 22 shows the blowing air cleaning device used in the punching device,

FIG. 23 shows a section along line C-C in FIG. 2 to illustrate the stack feed and the format setting,

FIG. 24, in addition to the components shown in FIG. 23, the punching space cover,

FIG. 25 shows a representation according to FIG. 23, but with a clearly illustrated function of the interference contour detection, FIG. 26 shows a section along line D - D in FIG. 3 through the stack feed area of FIG

Machine.

The basic structure of the punching machine is illustrated in FIGS. 1 to 3:

A machine housing 1 houses the electrical units for a control system of the machine and a drive system for the hydraulics of the machine. These elements of the machine are illustrated in the machine housing 1 by the element block 2. Oriented obliquely to the horizontal, a hydraulic cylinder 3 is mounted in the machine housing 1 and is provided with connections 4 and 5 for hydraulic lines. The piston rod 6 of the hydraulic cylinder receives a punch 7 in the region of its free end which is directed upwards. This can thus be moved back and forth in the direction of the double arrow K and is used to move a stack 8 which is in each case in its alignment and which is formed from leafy material. The orientation of the individual sheets of the stack is illustrated by lines. The machine housing 1 closes in the area of the punch 7 perpendicular to the longitudinal axis of the piston rod 6. The actual punching device is flanged to the machine housing 1 in this housing area. On the side facing the machine housing 1, it has a main plate 10 flanged to the housing 1, which is provided with four bores in the region of its corners. These pass through guide rods 11 which are only axially displaceable. Actuators acting on the guide rods 11 inside the machine housing 1 are not illustrated. A punch head plate 12, which is positioned parallel to the main plate 10, is connected to the upward, free ends of the guide rods 11. The punching head plate 12 has a receiving device 13 on the side facing the main plate 10. Part of the receiving device 13 form two parallel and horizontally positioned strips 14 and 15, between which a rectangular frame 16 can be inserted. This frame 16 has clamping elements 17 on its side facing the main plate 10 on that hold a hollow cylindrical punch 18. The circumferential contour of the punch knife edge is designated by the reference number 19.

Pre-cut cutting stacks, for example label stacks 8 cut in a face cutting machine, also called benefits, are laterally in the direction of arrow L over a plane indicated by line 20 by means of a plurality of insertion fingers combined into a structural unit 21 into the area of the punch 7 against a stop (not shown) pushed. As can be seen in the illustration in FIG. 2, the insertion fingers are plate-shaped and extend over a height that is greater than the maximum stack height. As can be seen from the illustration in FIG. 3, the plates are arranged at a distance from one another. In FIG. 2, slots 23 for the insertion fingers 22, which can also be moved in the direction of the double arrow K, are illustrated with dashed lines. A sword-shaped hold-down 24 is mounted in the upper area of the main plate 10 and fixes the punched stack 7 in position from above. An upper plate-shaped punching chamber cover is designated with the reference number 25, and lateral punching chamber covers with the reference number 26.

The assembly 21 having the insertion fingers 22 is moved in the direction of the double arrow M for inserting the stack 8 into the actual punching area by means of a circulating belt, the assembly 21 being controlled back and forth in the upper section of the belt.

In operation, when the punch 7 is retracted, as is illustrated in FIG. 1, the cuboid-shaped stack of labels 8 is moved by means of the insertion fingers 22 against a stop adjusted in accordance with the size of the stack, so that the stack 8 is positioned symmetrically to the axis EE. When the punch 7 is extended, it presses the stack against the punch knife 18, with the result that the stack 8 is pushed through the punch knife 18 in one stroke. In this case, the punching head plate 12 remains stationary with respect to the main plate 10. The spacing thereof is only adjusted, the guide rods 11 moving in and out more strongly into the machine housing 1 if, for example, the punching knife has been reground and thus has a lower height, or a new one Punch knife is used. In such cases, a height correction, that is to say a correction of the distance between the main plate 10 and the punching head plate 12, must be carried out. 10

After punching a stack 8, the punch 7 is moved back into the starting position according to FIG. 1, the next stack 8 is inserted laterally into the area of the punch 7 and by means of the punch 7 this stack 8 is pressed through the punch knife 18, the stack being pressed when this is pressed previously pressed stack 8 is pushed out of the punching knife 18 at the back and fed to further processing. Ring waste generated during punching outside of the punch knife is disposed of in a waste container 30 by a blowing device 28 downward via a diverter plate 29. For reasons of graphic clarity, the illustration of the frame and the punching knife as well as subordinate details described in relation to the other figures has been omitted in FIG.

FIGS. 4 to 9 illustrate the arrangement of the frame 16 in the receiving device 13 and the fixing of the frame 16 in the punching head plate 12 as well as the mounting of the movable receiving device 13 in the punching head plate 12.

FIG. 4 illustrates the punching head plate 12 with the four bores 31 for receiving the guide rods 11. In the punching head plate 12 there are two guide rods 32 arranged parallel to one another in the direction of the double arrows M, thus being axially adjustable. The axial adjustment of the guide rods 32 takes place by means of adjustment motors 33 which can be controlled independently of one another. The mounting of the guide rods 32 is not illustrated. The one guide rod 32 shown on the right in the drawings takes on two pivot bearings 34 whose pivot axes are perpendicular to the punching head plate 12, the two strips 14 and 15 extend radially without play. The other guide rod 32 is correspondingly provided with pivot bearings 34 which, however, accommodate the strips 14 and 15 with play, which receive elongated holes 35 extending in the longitudinal direction of the strips 14 and 15. When adjusting the guide rods 32, the strips 14 and 15 are always moved parallel to one another, but once a rectangle, another time an obliquely angled square can be formed, depending on the displacement of the guide rods 32 in the same or the opposite direction, and there is also a displacement of the Receiving device 13 overall in the direction of the upper bores 31 or the lower bores 31 possible.

The punching head plate 12 has a central, essentially square opening 36 through which the punched material to be cut is conveyed away. In the area facing the bar 15, adjacent to the opening 36 in the punching head plate 12, there is a parallel to the pivot bearings 34 11 dentered centering bolt 37 is mounted, which faces the side of the punching head plate 12 to which the receiving device 13 is assigned. The centering pin 37 is held in a displacement device, not shown, which allows it to be moved in the direction of the double arrow N, thus perpendicular to the longitudinal extension of the guide rods 32, in the plane of the drawing sheet.

The strips 14 and 15 are designed as wedge strips, between which the frame 16 can be inserted and pulled out in the direction of the double arrow O. FIG. 4 illustrates the situation, for example, before the frame 16 is pushed in. The frame has, on its sides facing the strips 14 and 15, chamfered areas 38 which engage behind the projections 39 of the strips 14 and 15. The distance between the two strips 14 and 15 are dimensioned such that the frame 16 can be inserted between the strips with little play. The frame 16 receives the punching knife 18, which is preset in a manner to be described in more detail. The frame 16 consists of two long, parallel, lateral legs 40 and two parallel, short legs 41 connecting them, the leg 41 assigned to the bar 15 having a relatively large extent, based on the longitudinal orientation of the lateral legs 40. On its underside, thus on its side facing the centering pin 37, this short leg 41 is provided with a groove 42 extending parallel to the longitudinal extent of the lateral legs 40. The process of inserting the frame 16 between the strips 14 and 15, however, in contrast to the illustration in FIGS. 4 and 5, not from right to left, but from left to right, is illustrated in FIGS. 6 to 9. Shown is the wider short leg 41 of the frame 16, which is provided with two clamping claws 44 for holding the punch knife 18 on one side of the punch knife. This leg 41 is provided on its underside with the groove 42 extending perpendicular to the plane of the drawing sheet. The movable centering pin 37 is inserted into a recess in the punching head plate 12. It can be extended and retracted by means of a pneumatic cylinder 45, the pneumatic cylinder 45 acting on a pressure piece 46, between which and the centering pin 37 a spring 47 is arranged. When inserting the frame 16 between the strips 14 and 15, first, as illustrated in FIG. 6, a leading bevel 48 of the frame leg 41 presses against the centering pin 37 and presses it against the force of the spring 47 into the punching head plate 12, so that the frame 16 can be inserted between the strips 14 and 15. This stage is illustrated in FIG. 7. As soon as the frame 16 is pushed in so far that the centering pin 37 is in alignment with the groove 42 12 is located, the spring 47 pushes the centering pin 37 slightly outwards until the spring 37 comes against a stop. The centering pin 37, which protrudes slightly beyond the surface of the punching head plate 12 and which has slid out along a further slope 49 of the frame leg 41, makes lateral contact with a projection 50 on the frame, which adjusts the centered position of the frame, as illustrated in FIG. 9. The frame 16 is fixed relative to the punching head plate 12 in that, as is illustrated in FIG. 9, the centering pin 37 is extended by acting on the pneumatic cylinder 5, it penetrating the groove 42 in the frame.

Due to the possibility of adjusting the centering pin in the direction of the double arrow N, the frame 16 can be moved back and forth between the two guide rods 32. The movability of the strips 14 and 15 by means of the two guide rods 32 is ensured because the centering pin 37 can follow the predetermined movement of the strips 14 and 15 in the longitudinal direction of the groove 42. In this way, any orientation of the frame 16 and thus of the punch knife 18 held by the frame with respect to the punch head plate 12 and thus also of the stack 8 to be advanced by the punch 7 is possible. The removal of the frame, for example for resharpening the punch knife 18 or for exchanging the punch knife 18 for a new punch knife, takes place in the reverse manner.

In the aligned position for the punching process of the frame 16 or the punching knife 18 is by means of a pneumatic clamping cylinder 51 mounted in the bar 14, whose plunger 52 acts on the frame 16 in the region of the narrow, short leg 41, which between the bars 14 and 15 held frame braced against the bar 15. A certain, necessary play of the frame 16 between the two strips 14 and 15 is thus eliminated.

FIGS. 10 to 14 illustrate the details of the mounting of the punching knife 18 in the frame 16 and the mounting of the frame 16 in the punching head plate 12. The embodiment according to FIG. 10, which corresponds to that according to FIGS. 4 and 5, can be seen the punch knife 18 is held by means of pairs of claws 44 acting on one of the opposite sides of the punch knife. One pair of clamping claws formed from the two clamping claws 44 is screwed to wide, short legs 41 of the frame 16, while the pair formed by the two other clamping claws 44 is screwed to a first clamping beam 53, which is arranged parallel to the legs 41 and with the side legs 40 of the frame 13 mens 16 is screwed. In a manner not shown, this chip bar 3 is, like a second clamping bar 54 arranged parallel to it, slidably mounted in the longitudinal direction of the side legs 40. Depending on the thickness of the punch knife 18, the first clamping bar can thus always be pushed close to the punch knife 18, which the clamping claws 44 grip behind the punch knife 18 on both sides. The screws 55 assigned to the clamping claws and the screws 56 assigned to the first clamping beam 3 are then tightened slightly and the screws 67 assigned to the second clamping beam 54 are tightened more so that the second clamping beam 44 can no longer be displaced relative to the lateral legs 40. Screws 58 penetrating the second clamping beam 54 in the frame plane are set against the first clamping beam 53 and exert a permanent prestress on the first clamping beam 53, thereby ensuring the permanent clamping of the punching knife 18 between the clamping claws 44. Then the screws 55 and 56 are tightened.

11 and 12, the grooves 60 extending in the longitudinal direction of the side legs 40 for displacing the two clamping beams 53 and 54 are shown. The first clamping beam 53 and the wide, short leg 41 have a plurality of threaded bores 59 arranged next to one another, so that, according to the width of the punching knife 18 used in each case, the clamping claws 44 are connected at a suitable distance from one another to the first clamping beam 3 or to the wide, short leg 41 can be. The embodiment according to FIGS. 11 and 12 differs from that according to FIG. 10, however, in that the second clamping beam 54, which exerts the prestress on the first clamping beam 53 via the screws 58, is mounted in an upper section of the respective lateral leg 40 designed as a wedge 61 is, so that even when the punch knife 18 is used for a long time, its secure fixing between the clamping claws 44 is ensured. However, not only is a displacement of the second clamping beam 54 due to the wedges 61 counteracted, but also the clamping claws 44 are screwed to the wide short leg 41 and the first clamping beam 53 by means of the screws 55 via wedge-shaped bevels widening to the punching knife 18. As can be seen from the illustration in FIG. 12, the screws 55 penetrate elongated holes in the longitudinal direction of the side legs 40 and the screws are provided with wedge-shaped washers 63. 14

Instead of the wedge 41 for the secure positioning of the second clamping beam 54 away from the punching knife 18, as shown in FIG. 13, a positive connection between the side legs 40 and the second clamping beam 54 can be provided. This positive connection takes place by means of corrugated engagement surfaces 64 between leg 40 and clamping beam 54.

It is illustrated in FIGS. 11 and 12 that the clamping claws 44 are provided with projections 65 which form a step-shaped, acute-angled recess which serves to accommodate a complementary contour 66 of the punching knife 18. It is further illustrated that the two lateral legs 40 are provided adjacent to the wide short leg 40 with grooves 67 running parallel to the latter for receiving an insertion ruler described in more detail below.

FIG. 14 illustrates that the punching force Fs is introduced by the punching knife 18 directly, thus over a short distance, as a bearing force F _A into the wide, short leg 41 and the first chip bar 53, which are supported directly on the punching head plate 12. In contrast to this, the narrow, short leg 40 does not rest on the punching head plate 12. The plunger 52 of the clamping cylinder 51 presses against the chamfered area 38 of this leg 41 and not only causes the frame 16 to be pressed against the bar 15, but also that the frame 16 is acted upon by a force component in the direction of the punching force Fs. The clamping cylinder 51 does not necessarily have to be mounted in the bar 14; it is also possible to store it in the punching head plate 12. In this case, however, depending on the position of the frame 16, relatively long adjustment paths of the plunger 52 of the tensioning cylinder 51 might have to be accomplished.

FIGS. 15 to 18 show setting elements for presetting the punching knife 18 in the frame 16. According to a defined distance A, the distance between the end edge 68 of the frame 16 in the region of the wide, short leg 41 and the straight section 69 of the punching knife edge closest to it 19 is to be observed, a rod-shaped setting ruler 70 is inserted into the grooves 67 defined in the frame 16. The grooves 67 are preferably introduced into an elevation element 71 of the frame 16, so that the ruler 70 inserted into the grooves 67 is positioned just below the punch knife 18. In the case of loose fastening elements, the punch knife 18 is positioned such that the associated straight section 15

69 of the punch knife edge 19 is aligned with the edge of the setting rule 70 facing the wide, short leg 41. In this position, the two clamping beams 53 and 54 and the clamping claws 44 are fixed. The punching knife 18 is positioned in the longitudinal direction of the ruler 70 via center markings 87, which are attached to the outside of the punching knife 18 and / or the adjacent area of the frame 16.

In the embodiment according to FIGS. 17 and 18, an adjustment foil 72 is used instead of an adjustment ruler 70. This is connected to a frame 73 which can be connected to the frame 16, the adjusting film 72 being arranged parallel to the circumferential knife edge 19 of the punching knife 18. The adjusting film 72 is provided with an opening 74, the cross section of which corresponds to the opening cross section of the punching knife 18 in the region of the knife edge 19. The punch cross-section 18 is aligned with its opening cross-section with respect to the setting film 72 such that it is in register with the opening 74 of the setting film 72.

FIG. 19 shows in connection with the height adjustment of the punching knife 18 the punching knife 18 held in the frame 16 via the clamping claws 44, and the frame 16 mounted in the punching head plate 12. The main plate 10 of the machine housing 1 is perpendicular to it and in the direction of the punching knife 18 extending bearing plate 75 for supporting the stack 8 is provided. A sensor 76 which projects beyond the front end edge of the bearing plate 75 is connected to the underside of the bearing plate 75 and, in the sense of the drawn line 77, detects a distance dimension A in front of the end face of the bearing plate 75 parallel to the main plate 10. The punching head plate 12 is moved in the direction of arrow P by means of the actuators assigned to the guide rods 11 by means of motor-driven adjusting means (not shown) such that the punching knife edge 19 coincides with the line 77. Figure 20 illustrates an alternative embodiment, there is no sensor 76 provided, but rather a distance measuring system 78 which determines the distance between the main plate 10 and the punching head plate 12, which is initialized, for example, in the maximally extended position of the main plate 10 and the punching head plate 12 and then a defined distance measure of these two Parts approaches that corresponds to the distance A between the end face of the plate 75 and the cutting knife edge 19.

Figure 21 shows the arrangement and design of a label remover. During continuous piercing, there are punched-through labels 80 in the punch knife 18 and labels to be punched, illustrated by the stack 8, in the area of the punch 7. For removal 16 of one or more, last punched labels 80, the main plate 10 and the punching head plate 12 are moved apart, so that, starting from the gap A between the front surface of the bearing plate 75 and the punching knife edge 19, an enlarged gap B results. This is large enough to insert the label remover 79 into the gap. The label remover 79 is in particular inserted manually and has a handle 81 and a tube 82 connected to it, which receives a plate probe 83, and a vacuum connection 84. At least the last punched label 80 positioned in the plane of the punch knife edge 19 lies against the flat plate probe 83 mentioned, which is under negative pressure, and can thus be removed by means of the label remover 79 in order to subsequently improve the quality of the label 80 outside the punching device check.

FIG. 22 illustrates that two blowing nozzles 28 are arranged in the area of the punching knife and are directed from above onto the punching knife 18, thus essentially perpendicular to the direction of advance of the stack 8. The punching knife 18 has an outside knife on the side facing the blowing nozzle 28 85 for severing the ring-shaped punch waste 86 obtained during punching. The blowing nozzles are particularly adjustable in position and direction.

FIGS. 23 to 26 illustrate details in the insertion area of the stack 8 to be punched. This rests on the bearing plate 75, which is positioned inclined due to the inclined arrangement of the punching device 9, and is supported laterally on the main plate 10. Relative to the bearing plate 75, a stop element 88 and the insertion element 21 are mounted so that they can be moved or moved. The insertion element 21 can be moved against a stop 89. Both a center adjustment 90 and an independent format setting 91 are provided for the stop element 88 and the stop 89. The format is set by means of screws 93 axially fixed in a bearing element 92 and provided with opposite threads, which receive the stop element 88 and the stop 89 and are adjustable by means of a sand wheel 93. The center adjustment of stop element 88 and stop 89 takes place via the bearing element 92, into which a screw 95 is screwed, which is connected to an axle shoulder 96, which is rotatably mounted axially fixed in a shoulder 97 connected to the plate 75. The screws 93 are also connected to a shoulder 98 which is axially fixed in the shoulder 97 but is rotatably mounted.

EF ÄTZBLÄTT (RULE 26) 17

The toothed belt 27 receives the insertion element 21 via a pneumatic spring element 99, which can be moved back and forth in the sense of the double arrow shown in FIG. The retracted position of the insertion element 21 is illustrated in this figure with solid lines, while the double dash-dotted line illustrates a partially retracted position. In the inserted position of the insertion element 21, it contacts the stop 98, which thus limits its insertion path. The pneumatic spring element 99 serves to relieve the drive for the toothed belt 27 when the stop 89 is approached or in the event that the stop 89 moves the insertion element 21 against the direction of insertion by manual adjustment, in particular manual enlargement of the format via the format setting 91.

FIG. 23 illustrates that the punch 7 is provided with grooves 100, which extend not only in the plane of the drawing sheet, but also perpendicularly thereto, and for receiving the insertion fingers 22 of the insertion element 21, the fingers 101 of the stop element 88 and one Fingers 102 of a hold-down device 24 are used, which, according to the selected format setting, plunge more or less deeply into the grooves 100 of the punch 7.

FIG. 24 illustrates that cover plates 103, which are oriented parallel to the sheet plane of the stack 8, are connected to the stop element 88, the stop 89 and the hold-down device 24. In accordance with the stack format specified by means of the stop element 88, the insertion element 21 and the hold-down device 24, these only release a stack area which is slightly larger than the cross section of the stack 8 viewed perpendicular to the punching direction.

FIGS. 25 and 26 show that the cantilever 24 is connected to a cantilevered arm 104 which is directed away from the stop element 88 and which has a sensor 105 in the region of its free end, which is arranged next to the path of movement of the insertion element 21 and corresponding to the variable height setting the hold-down 24 scans a distance to the surface 20 of the plate 75. This distance measure is slightly less than the distance measure of the end face 106 of the hold-down finger 102 facing the surface. This means that if the sensor 105 does not detect a stack 8 that is inserted, it is ensured that this stack 8 does not hold the hold-down finger 102 collided. However, if the hold-down finger 102 is set and the sensor 105 is automatically set, if the stack 8 is too large or, as illustrated in FIGS. 25 and 26, a stack 8 18 tilted stack 8 'inserted by the insertion element 21, the sensor 105 detects this protruding area of the stack and controls the punching device in such a way that at least the insertion of the stack 8 is interrupted or the machine is stopped completely. However, to prevent the insertion of the insertion devices 22 past the sensor 105 in the sense of a malfunction, a further sensor 107 is additionally provided, which deactivates this when an attachment 108 of the insertion element 21 is detected, with sensor 105 not yet activated. The hold-down finger 102 can be adjusted by means of a pneumatic adjusting element 109 in the sense of the double arrow shown in FIG. 26 in order to effect the format setting.

Claims

19

P a t e n t a n s r u c h e n

1. Device for punching a stack which is formed from leafy material, in particular labels, the stack being pushed into the punching knife by a relative movement of a punching stack and a hollow cylindrical punching knife, characterized in that the punching knife (18) is adjustable in a frame (16) is held, which can be inserted perpendicularly to the relative travel direction (K) of the punch (7) and punch knife (18) into a receiving device (13) and can be fixed in a centered position, the receiving device (13) being relative in a punching head plate (12) adjustable to this is mounted.

, Apparatus according to claim 1, characterized in that the receiving device (13) has two strips (14, 15) arranged in parallel, between which the frame (16) can be inserted.

, Device according to Claim 2, characterized in that the strips (14, 15) are designed as wedge strips, the frame (16) being inserted between the strips (14, 15) on the sides facing one another and in each case between a strip (14 , 15) and the punching head plate (12) is positioned.

, Device according to one of claims 1 to 3, characterized in that the frame (16) is displaceable in a plane parallel to the punching head plate (12), in particular adjustable in two main axis directions arranged substantially perpendicular to one another and pivotable in the plane.

, Apparatus according to claim 4, characterized in that the frame (16) has a groove (42) substantially in one main axial direction, into which a centering pin (37) which can be moved essentially in the other main axis direction and can be inserted, in particular in the punching head plate (12 ) is stored.

, Apparatus according to claim 4 or 5, characterized in that the strips (14, 15) are arranged parallel to each other, and actuators (33) for the strips (14, 15) are provided 20, which are mounted in the punching head plate (12), one actuator (33) holding bar ends only pivotably, another actuator (33) receiving other bar ends pivotably and displaceably in the longitudinal direction of the bars (14, 15).

, Apparatus according to claim 5 or 6, characterized in that the setting direction of the actuators (33) is substantially perpendicular to the direction of travel of the centering pin (37).

, Device according to one of claims 2 to 7, characterized in that a tensioning element (51, 52) is provided which fixes the frame (16) in the set position in the receiving device (13), in particular the tensioning element (51, 52) is mounted in one (14) of the strips (14, 15) and presses the frame (15) against the other strip (15),

, Device according to one of claims 2 to 8, characterized in that the adjustment of the frame (16) in the strips (14, 15) and / or the adjustment of the strips (14, 15) relative to the punching head plate (12) is motorized.

0. Device according to one of claims 5 to 9, characterized in that the fixing of the frame (16) in the receiving device (13) and / or the fixing of the frame (16) by means of the centering bolt (37) is power-operated, in particular pneumatically.

1. Device according to one of claims 1 to 10, characterized in that in the frame (16) mounted, relative to the frame (16) adjustable and lockable clamping elements (17) are provided for fixing the punching knife (18), and a in the frame ( 16) mounted adjusting element (70, 72) is provided for alignment with at least one alignment edge of the adjusting element (70, 72) with a knife edge section (69) of the punching knife (18) before fixing the adjusted clamping elements (17).

2. Device according spoke 11, characterized in that the adjusting element is designed as an adjusting ruler (70) and the alignment is carried out on the one alignment edge (86) of the adjusting ruler (70). 21

13. The device according to one of claims 1 to 12, characterized in that the frame (16) has a frame part (40, 41) and a first chip beam (53) which is displaceable and fixable in the frame part (40, 41), wherein the punch knife (18) in the first clamping bar (53) and the frame part (40, 41), at a distance (41) of the frame part (40, 41), which is arranged parallel to the first clamping bar (53), and is held parallel to a first tensioning bar (53), a second tensioning bar (54) is arranged, which is displaceable and fixable in the frame part (40, 41), and tensioning means (58) are provided for tensioning the first and second tensioning bars (53, 54) such that the first clamping bar (53) can be clamped against the punching knife (18).

14. Device according to one of claims 1 to 13, characterized in that the frame (16) has the frame part (40, 41) and at least one in the frame part (40, 41) adjustable clamping bar (53) for fixing the punching knife (18) , The clamping bar (53) rests in the region of its ends on the punching head plate (12), the section (41) of the frame part (40, 41) which serves to hold the punching knife (18), rests on the punching head plate (12) and which section (41) of the frame part (40, 41) facing away from this distance (41) of the frame part (40, 41) is arranged at a distance from the stamping plate (12).