EP0760349A2 - Process and device for removing trimmed strips from their perforating needles - Google Patents

Abstract

The print carrier (82,83) has a cylinder (2) fitted with puncture needles (23) that impale trimmed strips (84,86). The strips are pushed completely off the needles and into a waste disposal unit. Preferably the strips are removed by radial fingers (6) fitted on a rotating shaft (4). The ends (9) of the fingers pass through cavities into the cylinder without coming into contact with the needles.

Description

The invention relates to a method for removing trimming strips located on pin needles of a transport cylinder of a folding apparatus in accordance with the preamble of claim 1 and an associated device according to claim 5.

DE 28 34 696 C2 shows a combined cutting and folding device. In this case, a folding knife uses cutting needles to cut a trimming strip. The trimming strip is cut off from a single printed paper web and, in such a needled manner, is guided past a rigid stripping device. Here, the trimming strip is gripped laterally, pressed against the puncture and finally removed from it.

From DE 29 31 968 B1 it is known to remove a rotating brush for stripping cut strips needled onto puncture needles. The bristles of the rotating brushes grip the trimming strips on the long side and press it against the puncture needles so that they are subjected to bending so that they are finally stripped from the puncture needles.

Holding trimming strips by means of suction air and then pushing them away from a cutting cylinder by means of blown air is known from DE 40 23 257 C2 and DE 42 29 699 A1. However, in these devices the trimming strips are not held and transported by means of punctures, so that the problems which arise when the trimming strips are transported by means of punctures are not present.

The generic DE 30 30 705 A1 discloses a smooth-cutting device consisting of a folding jaw cylinder with knives located on the circumference and a knife carrier cylinder, the knives of which interact in a scissor-cut manner and cut off a trimming or waste strip running transversely to the direction of transport. This trimming strip is needled by pin needles located on the knife carrier cylinder and fed to a suction device arranged downstream in the peripheral area.

A disadvantage of the transport of these trim strips to the suction device is that the trim strips needled onto the puncture needles leave the puncture needles prematurely due to a large centrifugal force effect of the knife carrier cylinder rotating at high speed, which leads to congestion and thus to malfunctions Removal of the trim strips can result.

The invention has for its object to provide a method and an apparatus for the safe removal of trim strips from print carriers from a cylinder rotating at high speed, in particular a knife cylinder of a scissor cutting device.

According to the invention, this object is achieved by the features of the characterizing part of claims 1 and 5.

The advantages that can be achieved with the invention are, in particular, that the trimming strips reliably up to a predetermined location, for. B. a suction device can be promoted without leaving the puncture needles prematurely. The trim strips are removed from the specially designed pin needles by means of rapidly movable ejectors or compressed air at the intended location, so that the trim strips are removed in the correct position; e.g. B. Delivery to a disposal facility. Small strips of trimmings can also be reliably removed. A grid-shaped guide device prevents a rotating ejector carrier from being wrapped with trimming strips. The punctures are not subjected to bending when stripping off the trim strips.

Fig. 1

einen Querschnitt durch eine Vorrichtung;

Fig. 2

eine Darstellung einer erfindungsgemäßen Vorrichtung mit einer ersten Ausführungsvariante eines Zylinders in einer ersten Arbeitsstellung vor einem Abstreifvorgang und in einer zweiten Arbeitsstellung nach einem Abstreifvorgang;

Fig. 3

eine Querschnitt durch einen Zylinder in einer zweiten Ausführungsvariante;

Fig. 4

eine Ansicht B nach Fig. 3;

Fig. 5

einen Querschnitt durch einen Zylinder in einer dritten Ausführungsvariante;

Fig. 6

eine Darstellung des Zusammenwirkens der Abstreiferfinger der Abstreifeinrichtung mit einer gitterförmigen Leiteinrichtung sowie den Punkturnadeln des Zylinders;

Fig. 7

eine schematische Darstellung des Kämmens der Abstreiferfinger der Abstreifeinrichtung in einer konkaven Ausnehmung des Zylinders in zwei Arbeitsstellungen;

Fig. 8

eine schematische Darstellung des Querschnittes eines Schneidmessers mit Punkturnadeln sowie einer Spitze eines Abstreiferfingers nach dem erfolgten Abstreifen eines Beschnittstreifens.

An embodiment of the invention is in the Drawing shown and is described in more detail below. Show it

Fig. 1

a cross section through a device;

Fig. 2

an illustration of a device according to the invention with a first embodiment of a cylinder in a first working position before a stripping process and in a second working position after a stripping process;

Fig. 3

a cross section through a cylinder in a second embodiment;

Fig. 4

a view B of FIG. 3;

Fig. 5

a cross section through a cylinder in a third embodiment;

Fig. 6

a representation of the interaction of the stripper fingers of the stripping device with a grid-shaped guide device and the pin needles of the cylinder;

Fig. 7

a schematic representation of the combing of the stripper fingers of the stripping device in a concave recess of the cylinder in two working positions;

Fig. 8

is a schematic representation of the cross section of a cutting knife with puncture needles and a tip of a scraper finger after stripping a trimming strip.

A device for removing trimming strips 84, which are needled onto puncture needles 24 of a cylinder 2; 86 of a print medium, e.g. B. paper consists of a rotating stripping device 1, which interacts with the upstream cylinder 2. A cutting knife bar 21 of the cylinder 2 can be equipped with counter-cutting knives 44; 46 of a counter-cutting knife cylinder 3 cooperate (Fig. 1).

The rotating scraper device 1 consists of a cylindrical rotating scraper finger carrier 4, z. B. a shaft 4, which has on its circumference in the axis-parallel direction a plurality of each at a clear distance b spaced wiper fingers 6.

The scraper fingers 6 have an approximately L-shape and are fixed with their foot 7 or the short leg by means of screws 8 on a flattened portion of the shaft 4 so that they cannot rotate. A free end 9 of a long leg 5 of the wiper finger 6 projects radially outwards. The wiper fingers 6 are of the same length and can be made of metal or plastic.

The free end 9 of each scraper finger 6 can be V-shaped or fork-shaped (FIG. 6) in order to grip around a puncture needle 24.

During the rotation of the shaft 4 about its longitudinal axis of rotation 11, the free ends of the stripper fingers 6 each circumscribe a circular path 12 with a radius r1 originating on the longitudinal axis of rotation 11. The circular paths 12 of the stripper fingers 6, which are spaced apart from one another, coincide with an envelope 10 also has the radius r1.

According to a second embodiment variant, instead of the one-piece scraper finger 6 described above, two scraper fingers are arranged next to one another on the shaft 4 at a slight clearance, ie the scraper finger is formed in two parts. This distance is somewhat larger than the largest diameter of the puncture needle 24. The width of the scraper fingers according to this embodiment can be smaller, for. B. be half the width of the wiper fingers 6 according to the first embodiment. The fork-like ends 9 of the stripper fingers 6 have the trimming strips 84; 86 a lateral distance from the puncture needle 24. This lateral distance can be from "just not touching the puncture needle 24 or touching", z. B. 0.1 mm, up to a distance of several millimeters. The fork-like ends 9 extend at least up to half the diameter of the puncture needle 24. However, they can be made longer, ie beyond the diameter of the puncture needle 24, in order to "tear through" the trimming strips 84; To prevent 86.

The cylinder 2 is z. B. solid and has one or more, for. B. three in a first embodiment on its circumference 14 formed with a radius r3 around its longitudinal rotation axis 36 regularly distributed rows 16; 17; 18 each with a plurality of drive-through depressions 15 arranged next to one another for the wiper fingers 6. There are e.g. B. twenty drive-through wells 15 per row 16; 17; 18 spaced apart in the axis-parallel direction of the cylinder 2. The drive-through recesses 15 correspond to the scraper fingers 6 in position and number. They "comb" with them temporarily and without contact.

Each drive-through recess is of a central angle ALPHA, e.g. B. included of 65 °. The cross section of each drive-through recess 15 can have any shape, e.g. B. lens or rectangular shape. However, the drive-through recess 15 or the drive-through space must have a depth t, width d and length l which is adapted to the respective circular path 12 of the stripper finger 6, so that the stripper finger 6 can pass through them in each case.

The cylinder 2 carries - seen clockwise - at the beginning 19 z. B. the row 16 of drive-through recesses 15 a cutting knife bar 21 crossing the drive-through recesses 15 with a cutting edge 22. The cutting edge 22 protrudes a few millimeters, d. H. one to two millimeters beyond the circumference 14 of the cylinder 2. In addition, a puncture needle bar 23 with a row of puncture needles 24 arranged next to one another is arranged in such a way that the smallest possible distance from the cutting edge 22 results and they run parallel to one another. The puncture needle bar 23 is advantageously combined with the cutting knife bar 22. That is, both strips 21; 23 are integrally formed (Fig. 8). As a result, a small distance between the puncture needle 24 and the cutting edge 22 can be achieved. Both strips 21; 23 are attached to the cylinder 2 so that the extensions of their vertical axes 26; 27 cut the circumference 14 of the cylinder 2 as parallel secants (Fig. 2).

The puncture needle bar 23 is comb-like and has tines 28 spaced apart from one another over its entire length at a clear distance d. They serve to support trim strips 84; 86. Gaps 29 between the prongs 28 each serve to receive a puncture needle 24 and to pass one stripper finger 6 without contact. Each puncture needle 24 has one or more conical "barbs" 32 below its tip 31. The puncture needles 24 are screwed by means of a thread on their foot 33 into a threaded hole in the base 34 of the gap 29. The tip 31 of each pin 24 protrudes by an amount f, z. B. two to four millimeters beyond the circumference 14 of the cylinder 2.

A scraper finger 6 is assigned to each puncture needle 24. With each revolution of the cylinder 2 about its longitudinal axis of rotation 36, the tips 31 of the puncture needles 24 each describe a circular path 37 with a radius r2 (FIG. 8), so that a total surface area 45 is created.

. Eine Anordnung der Kreise 12; 37 nach dieser Beziehung ergibt, daß die zwei Kreise 12; 37 die Schnittpunkte A und B haben. Schnittpunkt A ist der Punkt, bei dem sich die beiden Kreise 12; 37 beim Zusammenlauf schneiden. Schnittpunkt B ist der Punkt, bei dem sich die beiden Kreise 12; 37 beim Auseinanderlauf schneiden. Eine Sekante 89 durch die Schnittpunkte A und B schneidet von beiden Kreisen 12; 37 Segmente 92; 91 ab. Die so gebildeten Sekanten der beiden Segmente 91; 92 fallen zusammen, so daß die aneinanderliegenden Segmente 91; 92 einen linsenförmigen Mindestquerschnitt des notwendigen von den kreiszylinderförmigen Mantellinien 10; 45 begrenzten Durchfahrraumes 15 bilden (Fig. 7). In der Praxis jedoch wird der Durchfahrraum etwas größer ausgebildet.A connecting line 64 through the origins 11; 36 of the circles 12; 37 with the radii r1; r2 has a distance c between the origins 11; 36 on. The location of the circles 12; 37 to each other is determined as follows: $\text{r2 + r1>c> | r1 - r2 |}$

. An arrangement of the circles 12; 37 according to this relationship shows that the two circles 12; 37 have the intersections A and B. Intersection A is the point at which the two circles 12; 37 cut when converging. Intersection B is the point at which the two circles 12; 37 cut apart. A secant 89 through the intersections A and B intersects from both circles 12; 37 segments 92; 91 from. The secants of the two segments 91; 92 coincide, so that the adjacent segments 91; 92 a lenticular cross section of the necessary of the circular cylindrical surface lines 10; 45 limited passage space 15 form (Fig. 7). In practice, however, the drive-through area is made somewhat larger.

With the combined cutting knife and puncture needle bar 21; 23, the gaps 29 are open both in the direction of the circumference 14 and in the direction of the side facing away from the cutting knife bar 21. This enables the stripper fingers 6 to be “contactlessly combed” with the pin needles 24.

According to a second embodiment variant (FIGS. 3 and 4), instead of the rows 16; 17; 18 of drive-through recesses 15 a plurality of rings 40 with intermediate ring grooves 41 of a depth t arranged. The rings 40 and the ring grooves 41 run coaxially to the longitudinal axis of rotation 36 of the cutting knife cylinder 2 with an outer radius r3 and a radius r. The rings 40 have a width b1 and are arranged at a clear distance d from one another.

A cutting knife and puncture needle bar 21; 23 is attached to the cutting knife cylinder 2 in the same design and function and position.

In a third embodiment variant (FIG. 5) of the cutting knife cylinder 2, the cutting knife and Pinpoint needle bar 21; 23 by the amount "t" beyond the cylinder jacket 43 with the radius r. The cutting knife and puncture needle bar 21; 23 is designed in exactly the same way as in the second exemplary embodiment. All other functions are as described above.

The counter-cutting knife cylinder 3 carries counter-cutting knives 44; 46 which in counter-cutter knife holders 47; 48 are held. In cooperation with the counter-cutting knife 44; 46, each with the cutting edge 22 of the cutting knife bar 21, a so-called "scissor cut" is produced. The counter-cutting knife cylinder 3 is designed as a combined cylinder. In addition to the counter-cutting blades 44; 46 are also in a known manner cam-controlled jaws 52; 53 provided.

The number of jaws 52; 53 and counter-cutting knife 44; 46 are the same; e.g. B. five each.

A guide device 54 for trimming strips is arranged between the cylinder 2 and the stripping device 1 (FIGS. 2 and 6). The guide device 54 consists of guide bars 56 arranged next to one another at a clear distance g. The clear distance g between the guide bars 56 is dimensioned such that the wiper fingers 6 pass between them without contact.

The guide rods 56 are fastened with their first straight end 57 to a bracket 58 fixed to the side frame. The bracket 58 is, for. B. from each screwable clamp pieces 59; 61, each of which can be clamped at a distance from one another on a crossbar 62 fixed to the side frame. Each upper clamp 59 carries z. B. a first straight end 57 of a guide rod 57. The straight end 57 subsequently merges into an approximately semicircular convex curvature 63. The guide rods 56 curve around the shaft at a distance r4 minus the thickness of the guide rods 56 from above. a connecting line 64 between the longitudinal axes of rotation 11; 36 the convex curvature 63 of the guide rods 56 changes into a concave curvature 66. In this way, the guide rods 56 bypass the cutting knife cylinder 2 at a short distance below and end shortly before the counter-cutting knife cylinder 3. The convex curvature 63 has an outer radius r4, which has its center point 67 at a distance e from the longitudinal axis of rotation 11 on an extension of the connecting line 64 . The axially aligned projections of circular path 12 and concave curvature 66 intersect at a lower intersection 68. This lies in the direction of rotation of both devices 1; 2, shortly before an inlet gusset 69 of the intersection A of the circular path 12 with the circular path 37. Furthermore, the axially aligned projections of the circular path 12 and the convex curvature intersect 63 in an upper intersection 71, which is in the immediate vicinity of the transition from the straight end 57 to the convex curvature 63 of the guide rod 56. Both intersection points 69; 71 lie on a side of the guide device 54 facing away from the shaft 4.

Thus, the ends 9 of the stripper fingers 6 move from the intersection 68 into the gaps 55 between the guide rods 56 and leave them again at the intersection 71. The ends 9 thereby cover a cross-sectional area between the guide rod 56 and the circular path 12, which has the shape of one below broken crescent moon.

The stripping device 1 and the cutting knife cylinder 2 are enclosed by a housing 72, which consists of an upper housing part 73 and a lower housing part 74 with the associated side parts (FIGS. 1 and 2). The upper housing part 73 begins with a left straight part 76, which extends above the convex curvature 63 of the guide rods 56 at a distance x. The straight part 76 is followed by a right semicircular curved non-perforated part 77, which runs above and at a short distance from the circumference 14 of the cylinder 2 and ends in the immediate vicinity of the counter-cutting knife cylinder 3.

The lower unperforated housing part 74 extends from a straight left end 78 over a convex, at least semicircular curvature 79 to a right end 81. The right end 81 is releasably attached to the guide rods 56 near the cylinder 2.

The two sides of the upper housing part 73 are connected to the lower housing part 74. The lower housing part 74 is attached to the holder 58 at its straight left end 78 together with the first ends 57 of the guide rods 56. The left straight part 76 and the left end 78 together with the side parts form a shaft 80. The shaft 80 is for the purpose of suctioning off the trim strips 84; 86 connected to a disposal device at the outlet port of a suction air blower, not shown.

The device according to the invention works as follows: The counter-cutting knife cylinder 3 transports z. B. counterclockwise in its jaws 52; 53 folded signatures 82; 84, which at their two superimposed ends 88 - the z. B. puncture needle punctures - should be cut off (Fig. 1). The end 88 of the signature 83, which protrudes beyond the counter-cutting knife 46 and has the puncture needle punctures, is cut off in cooperation with the cutting knife bar 21 and is practically needled as trimming strips 84 onto the puncture needles 24 of the cylinder 2 rotating at production speed. On which is moving at production speed in a first direction of rotation rotating cylinder 2, the needled trimming strip 84 travels on its circular path 37 to the first intersection A of the two intersection points A, B and reaches the segment 91 of the drive-through space 15. While the trimmed strip 84 moves between the intersection points A and B of the drive-through space 15, these pass Scraper finger ends 9 in a direction of rotation opposite to cylinder 2 intersect A and reach the segment 92 on the circular path 12. Since the peripheral speed of the scraper finger ends 9 z. B. is three times larger than that of the puncture needle tips 31, the puncture needles 24 are obtained from the stripper finger ends 9. In this case, the needled trimming strip 86 is still passed under by the stripper finger ends 9 in the segment 92. Each fork-like end 9 of the stripper fingers 6 engages around the puncture needle 24 associated with it without contact. In this state, the closest approach of the stripper ends 9 to the puncture needles 24 is reached. The stripper finger ends 9 subsequently push the trimming strip 84 downward from the puncture needles 24 in the direction of its tip 31 (see dashed illustration in FIGS. 2 and 7). With further movement, the stripper finger ends 9 leave the segment 92 at the intersection point B. The trim strip 86 is thus pushed down from the puncture needles 24 during the overtaking. The trim strip 84 is conveyed through the scraper finger ends 9 along the guide device 54 in the direction of the disposal device 80.

At the same time, the trim strip 84 is also sucked in by means of suction air.

As a result of the arrangement of continuous annular grooves 41 in the second embodiment variant of the cylinder 2 or the use of a cylinder with a smaller radius r in a third embodiment variant, it has also become possible for the stripping device to have a different peripheral speed. The peripheral speed of the stripping device 1 can, for. B. 2.5 times the peripheral speed of the cylinder 2. In this case, however, an additional wiper finger must be arranged on the shaft 4, offset by 180 ° to the first wiper finger 6. It must always be a synchronization between the ends 9 of the stripper fingers 6 and the puncture needles 24 at the time the trim strips 84 are pushed down; 86 be given.

Both the cylinder 2 and the stripping device can be driven by the counter-cutting knife cylinder 3 via known gearwheels. The stripping device 1 and the cylinder 2; 3 are rotatably mounted in side frames, not shown.

Instead of the stripping device 1 can also in the vicinity of the puncture needles 24, z. B. at the foot 33 of the same, in the longitudinal direction directed clocked blowing air nozzles can be arranged. So that can Trim strips 84; 86 are pushed down by the needle 24.

Parts list

1

Scraper

2nd

cylinder

3rd

Counter-cutting knife cylinder

4th

Shaft (1)

5

Leg, long (6)

6

Wiper fingers (1)

7

Foot (6)

8th

screw

9

End (6), free

10th

Lateral surface (9)

11

Longitudinal rotation axis (1)

12th

Circular path (9)

13

-

14

Scope (2)

15

Drive-through recess (16; 17; 18)

16

Row (15)

17th

Row (15)

18th

Row (15)

19th

Early (15)

20th

Longitudinal axis

21

Cutting knife bar (2)

22

Cutting edge (21)

23

Pinpoint needle bar (2)

24th

Pinpoint needle (23)

25th

-

26

Vertical axis (21)

27

Vertical axis (23)

28

Tine (23)

29

Gap (23)

30th

-

31

Lace (24)

32

Barb (31)

33

Foot (24)

34

Basic (29)

35

-

36

Longitudinal rotation axis (2)

37

Circular path (31)

38

-

39

-

40

Ring (2)

41

Ring groove

42

-

43

Cylinder jacket (2)

44

Counter cutting knife

45

Lateral surface (37)

46

Counter Cutting Knife (3)

47

Counter Cutting Knife Holders (44)

48

Counter Cutting Knife Holders (46)

49

Traverse (3)

50

-

51

Traverse (3)

52

Folding jaw (3)

53

Folding jaw (3)

54

Control device

55

Gap (56)

56

Guide rod (54)

57

End, first (56) straight

58

Bracket (56; 64)

59

Clamping piece (58)

60

-

61

Clamping piece (58)

62

traverse

63

Curvature, convex (56)

64

Connecting line (11; 36)

65

-

66

Concave (56)

67

Circle center (r4)

68

Intersection, first (12; 66)

69

Inlet gusset

70

-

71

Intersection (12; 63)

72

casing

73

Housing part, upper

74

Housing part, lower

75

-

76

Part, left straight (73)

77

Part, curved (73)

78

End, left, (74) straight

79

Curvature (74)

80

Shaft (76; 78)

81

Right End (74)

82

Signature, folded

83

Signature, folded

84

Trim strips

85

-

86

Trim strips

87

Area (A; B)

88

End (83)

89

Secant (A; B; 12, 37)

90

-

91

Segment (89; 37)

92

Segment (89; 12)

b

clear distance (6)

c

Distance (11; 36)

d

Width 16; 17; 18 distance (28) distance, clear (40)

e

Distance (11; 67)

f

Distance (14; 37)

G

Distance (56)

l

Length 16; 17; 18th

t

Depth (41; 15)

x

Distance (63; 76)

r

Radius (41)

r

Radius (43)

r1

Circular path (12; 10)

r1

Radius (9)

r2

Radius (37; 45)

r3

Radius (14; 2)

r4

Outer Radius (63)

b1

Width (40)

A

Intersection (12; 37)

B

Intersection (12; 37)

ALPHA

Center angle

Claims (16)

Method for treating trim strips (84; 86) of a print carrier (82; 83) needled onto puncture needles (24) of a cylinder (2) before they are fed to a disposal device (80), characterized in that the needled trim strips (84; 86 ) completely pushed down from the puncture needles (24) by means (6) acting on them from below and fed to a disposal device (80). A method according to claim 1, characterized in that the needled trimming strips (84; 86) are pushed down by means of scraper fingers (6) traveling underneath them, each moving on a circular path (12). Method according to claim 1, characterized in that the needled trim strips (84; 86) are pushed down by means of clocked blown air directed in the longitudinal axis direction of the puncture needles (24). Method according to claims 1 and 2, characterized in that in each case the needled trimming strip (84; 86) rotates on the cylinder (2) at production speed on a circular path (37) with a first direction of rotation such that it passes through makes a cut with two intersection points (A; B) of the two circular cylindrical outer surfaces (10; 45) with radii (r1; r2) delimited lenticular drive-through space (15) that within each of these drive-through space (15) the needled trim strips (84; 86) caught and overhauled by puncture needles (24) on the side of the stripper finger ends (9) and finally pushed down during the overtaking from the puncture needles (24) and taken away by the stripper finger ends (9) and subsequently released to the disposal device (80). Device for carrying out the method according to claims 1, 2 and 4, characterized in that a stripper device (1) provided with rotatable stripper fingers (6) is preceded by a cylinder (2) provided with puncture needles (24) such that the stripper fingers (6) perform a rotational movement next to or in the path of movement of the puncture needles (24). Apparatus according to claim 5, characterized in that the scraper device (1) has a plurality of scraper fingers (6) fastened next to one another on a rotatably mounted shaft (4) at a clear distance (b), that the scraper fingers (6) extend in the radial direction (r1) extend outwards so that a plurality of puncture needles (24) of an upstream cylinder (2) are spaced alongside one another on the lateral surface (45) of the cylinder (2) at such an axially parallel distance. are arranged in such a way that they mesh with the wiper finger ends (9) without contact, that the ends (9) of the wiper fingers (6) temporarily pass through recesses (15) in the cylinder (2). Device according to claims 5 to 6, characterized in that each wiper finger (6) is fork-shaped at its end (9). Device according to claims 5 to 6, characterized in that each scraper finger (6) is formed in two parts, that the distance between two scraper fingers (6) is greater than the largest diameter of the puncture needle (24). Device according to claims 5 to 8, characterized in that the upstream cylinder (2) on its circumference (14) has rows (16; 17; 18) of regularly distributed passages (15) for wiper fingers (15) arranged next to one another at a distance (b1). 6). Device according to claim 9, characterized in that the drive-through recesses (15) each have a lens shape with a greatest depth (t). Apparatus according to claim 9, characterized in that the drive-through recesses (15) each have a rectangular shape with a greatest depth (t). Device according to claims 5 to 11, characterized in that the cylinder (2) has a plurality of rings (40) arranged at a distance (d) from one another with grooves (41) of a depth (t) between them (Fig. 3). Device according to claims 5 to 11, characterized in that the cylinder (2) consists of a cylinder body (42) with a radius (r), that a cutting knife and puncture needle bar (21; 23) at least by an amount (t) protrudes from the cylinder jacket (43) (Fig. 5). Device according to claims 5 to 13, characterized in that between the cylinder (2) and the stripping device (1) there is a guide device (54) consisting of guide bars (56) arranged next to one another at a clear distance (g) for the contact-free passage of the stripper fingers (6 ) is provided. Device according to claims 5 to 14, characterized in that the cylinder (2) and the stripping device (1) is surrounded by a housing (72) which can be acted upon by suction air, that this is connected to a disposal device via a shaft (80). Device according to claims 5 to 15, characterized characterized in that the puncture needles (24) of the upstream cylinder (2) are arranged on a puncture needle bar (23), that a cutting knife bar (21) is arranged parallel to this.

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