EP2030935B1 - Cutting device for the transverse cutting of at least one material web - Google Patents

Abstract

The cutting device can transversely cut through at least one material web (03, 04). It comprises a transporting cylinder (11), which is arranged so as to form a first cutting gap (08) with a first transverse cutter (12). The transporting cylinder is also arranged so as to form a second cutting gap (09) with a second transverse cutter(13).

Description

The invention relates to a cutting device for cross-cutting at least one material web according to the preamble of claim 1.

Such a cutting device is z. B. used to dissect in a web-fed rotary printing machine printed paper webs into individual signatures.

Known cutting devices of this type comprise a transport cylinder and a cutting cylinder, which are rotatable together and define a gap through which a transport path for the material web to be cut passes, and the cutting cylinder carries at least one knife, which cuts off a signature from the material web, if it passes through the gap.

The DE 35 27 710 A1 and the EP 0 627 310 A1 disclose folders in which two folding blade cylinder act together with a jaw cylinder. Each of these folding blade is assigned a single knife cylinder.

The DE 93 20 814 U discloses a method of operating a folder wherein two tracks are fed separately to a transfer cylinder.

The DE 239 837 C describes a cutting device for the transverse cutting of material webs with a cutting and transport cylinder, which forms a cutting gap with two counter-cylinders.

The invention is based on the object, a cutting device for transverse cutting to create at least one material web.

The object is achieved by the features of claim 1.

The achievable with the present invention consist in particular in that it allows the joining of two webs of material, which are supplied to the transport cylinder on the two transport paths to a common product or the processing of a web with a very large number of layers by joining two Partial lanes allowed.

The processing of material webs composed of a large number of layers with conventional cutting devices presents difficulties for several reasons. On the one hand, draw rolls, which are conventionally provided for setting a required tension of the material web, only act directly on the respectively outermost layers of the material web; on the inner layers their power is transferred only indirectly by friction of the material layers to each other. These frictional forces are not precisely controllable, especially not when the web needs to be steered around curves, i. H. a roll wraps around. Therefore, the larger the number of tracks, the less the tension of the inner layers of such a web is controllable. Also, the forces required to process a web, be it cutting or puncturing puncture holes in the web, are the greater, the greater the number of their layers. In the cutting device, these forces are reduced. As a result, the cutter can be made lighter and thus less expensive than a conventional one without sacrificing quality.

In order to prevent the second cutting blade from again cutting into the first web when passing through the second cutting gap, the rotation of the two cutting cylinders is preferably synchronized so that the second cutting blade passes through the second cutting gap to one from the first cutting blade produced cut in the first lane meets.

In order to facilitate the making of this cut, means are preferably provided for pulling apart the cut edges produced by the first knife when cutting the first web, so that the second knife, as it passes through the nip, encounters a gap of non-disappearing width in the gap first track abuts.

Various preferred embodiments of means for separating the cut edges are described in the embodiments.

The cutting device is preferably part of a folding apparatus, in particular, the transport cylinder can simultaneously act as a folding blade cylinder of the folder.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Fig. 1

eine schematische Seitenansicht eines Falzapparats mit einer Schneidvorrichtung;

Fig. 2 bis 5

jeweils Teilschnitte des Transportzylinders und eines Schneidzylinders in unterschiedlichen Ausgestaltungen der Erfindung;

Fig. 6

eine Darstellung einer Betriebsweise;

Fig. 7

eine Darstellung einer anderen Betriebsweise.

Show it:

Fig. 1

a schematic side view of a folding apparatus with a cutting device;

Fig. 2 to 5

each partial sections of the transport cylinder and a cutting cylinder in different embodiments of the invention;

Fig. 6

a representation of a mode of operation;

Fig. 7

a representation of another mode of operation.

Fig. 1 shows a schematic side view of a folder. This folder has two enemas 01; 02 for multilayer material webs 03; 04, in particular paper webs 03; 04, which in the following as inner or outer web 03; 04 are called. Both tracks 03; 04 each pass through a pair of draw rollers 06; 07 for adjusting their tension and meet a transport cylinder 11 in the amount of cutting gaps 08; 09 between the transport cylinder 11 on the one hand and one of the cutting cylinder 12; 13 on the other hand. Instead of two inlets 01; 02 and two cutting gaps 08; 09, three or more may be provided. The tracks contact 03; 04 preferably each first the transport cylinder 11 and then the cutting cylinder 12; 13, ie the tracks 03; 04 wrap around first the transport cylinder 11 and then the cutting cylinder 12; 13th

Each cutting cylinder 12 and 13 has a circumference corresponding to at least one, preferably two lengths of the webs 03; 04 to be produced signatures and carries two cutting blades 14th

The circumference of the transport cylinder 11 corresponds to more than five, in particular seven lengths of the signature. Seven at equal intervals in the peripheral surface of the transport cylinder 11 inserted counter cutting strips, z. B. hard rubber strips, serve as an abutment 15, each with the cutting of the webs 03; 04 cooperate with a cutting blade 14. Each of the abutment 15 is adjacent to a holding device 16, z. B. spur strip 16 with extendable puncture needles 23 (see Fig. 2 to 5 ) is arranged on the transport cylinder 11.

In the in the Fig. 1 shown position a cutting blade 14 of the cutting cylinder 12 and an abutment 15 of the transport cylinder 11 just pass through the cutting gap 08 and thereby sever the inner web 03. The resulting during cutting leading edge of the inner web 03 is at the puncturing needles 23 just before reaching the cutting gap 08th skewered extended puncture 16, which hold him firmly on the surface of the transport cylinder 11 during further transport.

The cut off in this way from the inner web 03 signature is further promoted on the transport cylinder 11 to the cutting gap 09, where the outer web 04 puts it over and is also impaled by the puncturing needles 23 of the spur strip 16.

The rotation of the two cutting cylinders 12; 13 is synchronized so that a cutting blade 14 of the cutting cylinder 13 always at the same time with a small gap between two successive, cut from the inner web 03 signatures and an abutment 15 passes through the cutting gap 09. Different techniques for creating this gap will be discussed below with reference to the Fig. 2 to 5 explained.

The angular distance between the two cutting gaps 08; 09 is about 50 ° in the example shown here. This angular distance may differ from the angular distance of the spur strips 16 from each other (51.5 °) or a multiple thereof, so not at the two cutting gaps 08; 09 is cut simultaneously; even a half-integer multiple of this value is unfavorable from the viewpoint of vibration avoidance.

After passing through the cutting gap 09 each puncture strip 16 carries a total product, which is composed in each case of a cut off from the inner web 03 signature and a truncated from the outer web 04 signature. With each revolution of the transport cylinder 11 seven products are produced, as well as when both tracks 03; 04 in a conventional manner via a common inlet 01; 02 would be supplied. However, since the cutting of each signature on two cutting steps at the cutting gaps 08; 09 distributed, the force to be applied in each cutting step is lower, and a satisfactory synchronization of the machine is easier to maintain.

On the transport cylinder 11 are also seven in the FIG. 1 not shown folding blade attached, which are respectively extended upon reaching a gap 17 between the transport cylinder 11 and a jaw cylinder 18 to pass the transported on the transport cylinder 11 signatures on the jaw cylinder 18 in a conventional manner and to fold. The folded products are transferred from the jaw cylinder 18 to a paddle wheel 19 and are designed by the latter onto a conveyor belt 21.

Fig. 2 shows a detailed view of the cutting gap 09 and its surroundings according to a first embodiment of the invention. Two of the seven puncture strips 16 of the transport cylinder 11 are in the Fig. 2 shown and with spur strips 16 '; Both are respectively pivotable about a shaft 22 and carry puncturing needles 23 which are oriented so that their protruding from the circumference of the transport cylinder 11 tip is further away from the center of the shaft 22 as their lying within the transport cylinder 11 base The puncturing needles 23 of the spur strip 16 'are in a comparatively far extended position, in which they have previously also passed through the cutting gap 08. This same position is drawn in dashed lines at the location of the spur strip 16 ".

In comparison, the spur strip 16 "is pivoted back into the interior of the transport cylinder 11. This pivoting movement causes a displacement of the point of intersection between the sprocket pins 23 and the surface of the transport cylinder 11 counter to the direction of rotation of the sprocket 16" Signature 24 compared to the position in which it was cut at the cutting gap 08 of the inner web 03, slightly shifted against the direction of rotation of the transport cylinder 11. After passing through the cutting gap 09, the spur strip 16 "returns to the position shown in dashed lines or even moves into an even further extended position so as to cancel out or overcompensate the backward shift of the signature 24. In this way, the signature is formed in each case 24 and immediately before truncated signature 27 a narrow gap 26, in which the cutting blade 14th engage and so the outer web 04 can press against the abutment 15 and cut, without running the risk, again one of the signatures 24; 27 to cut.

Fig. 3 shows an alternative embodiment of the transport cylinder 11 and the cutting cylinder 13 in a partial section analogous to that of Fig. 2 , The cutting cylinder 13 has for each cutting blade 14 on its outer circumference projecting bar 28 which passes through the cutting gap 09 in each case shortly before the associated cutting blade 14. A complementarily shaped groove 29 on the transport cylinder 11 is opposite the bar 28 at each nip passage, so that the bar 28 pushes a trailing edge portion of the 27 cut off from the inner web signature 27 and the outer web 04 in the groove 29. As a result, the trailing edge of the signature 27 is pulled forward and the gap 26 is opened. It is therefore not necessary in this embodiment that the spur strip 16 "pivots outwards again after its passage through the cutting gap 09 to generate the gap 26.

A third embodiment is in Fig. 4 again shown with reference to a partial section of the transport cylinder 11 and the cutting cylinder 13. The cutting cylinder 13 is identical to that of Fig. 2 , the transport cylinder 11 differs by the arrangement of the shafts 22 about which the spurs 16 are pivotable. While in the embodiments of Fig. 2 and 3 These waves 22 are in the direction of rotation of the transport cylinder 11 in front of the point needles 23, they are in the embodiment of Fig. 4 arranged behind this. The orientation of the puncturing needles 23 with respect to the surface of the transport cylinder 11 is the same in all cases, they are slightly inclined against the surface normal in the direction of rotation of the transport cylinder 11 forward, so that acting on a spiked on the point needles 23 material tension this against the Surface of the transport cylinder 11 holds pressed.

From the changed arrangement of the waves 22 results in a modified sequence of Pivoting movement here with 16 *; 16 ** designated puncture strips. The spur strip 16 *, which is still far away from the cutting gap 09, is in a comparatively slightly extended position, in which its point needles 23 extend far enough beyond the circumference of the transfer cylinder 11 to hold the inner web 03. Only shortly before reaching the cutting gap 09 is the spur strip 16 * extended further to also puncture the outer web 04, as can be seen on the spur strip 16 **. In this embodiment, the outward movement of the puncturing needles 23 causes a shift of their intersection with the circumference of the transport cylinder 11 against the direction of movement and thus a departure of the leading edge of the held by the spur strip 16 ** signature 24 from the point of impact of the cutting blade 14 on the abutment 15th On the other hand, the puncturing needles 23 of the spur strip 16 *** are once again pulled back into the transport cylinder 11 in order to advance the signature 27 they hold in the circumferential direction and thus open the gap 26 at the level of the abutment 15

In this embodiment, several changes of direction in the movement of the puncturing needles 23 are avoided in the course of a revolution of the transport cylinder 11.

A fourth embodiment of the cutting device is in Fig. 5 turn in a to Fig. 4 analog view shown.

In this embodiment, on the circumference of the transport cylinder 11 are each between two consecutive Punkturleisten 16 *, 16 **, 16 ***, ... segments 32 *, 32 **, ... arranged to increase the size. Each of these segments 32 *, 32 **, ... is composed of a plurality of flexible blades, which are arranged in the axial direction of the transport cylinder 11 side by side and spaced by gaps. These columns are used in the transfer of the finished cut signatures 24; 27 at the jaw cylinder 18 respectively as outlet openings for prongs of a (not shown) folding blade. The ends of the fins are each in the circumferential direction of the Transport cylinder 11 sliding head strips 33 anchored.

The segment 32 * is in a configuration in which the course of its lamellae corresponds to the cylindrical shape of the transport cylinder 11. After passage of such a segment 32 * through the cutting gap 09 whose head strips 33 are moved towards each other, so that its lamellae, as shown on the segment 32 ** form a project beyond the circumference of the transport cylinder 11 projection. As a result of this projection, the distance between the pin punctures 16 ** and 16 *** measured along the surface of the transport cylinder 11 is greater than that between the puncture strips 16 * and 16 **, the latter corresponds to the length of the signatures 24 generated at the cutting gap 08; 27. The bulge of the segment 32 ** therefore causes between the signatures 24 and 27, the gap 26 is formed, in which the cutting blade 14 of the cutting cylinder 13 can engage.

The second cross-cutting device 11, 13 is disposed on the circumference of the transport cylinder 11 phase-shifted cutting.

The section of the first cross-cutting device 11, 12 on the transport cylinder 11 takes place next to, in particular 10 mm next to, the other section of the second cross-cutting device 11, 13th

The first and second cross-cutting devices 11, 13 are arranged in the circumferential direction on the transport cylinder 11.

Instead of the folding jaw cylinder 18, a further transport cylinder for transferring the signatures can be connected downstream in all modes of operation, which in turn can be followed by a jaw cylinder or a belt system.

It is also possible that each of the tracks 03; 04 same patterns A and B in succession, ie in the transport direction. These patterns A and B are preferably printed with at least one forme cylinder of a printing unit which carries two identical patterns A or B on the circumference. The tracks 03; 04 are superimposed, so that signatures arise with superimposed patterns A and B, which pass in each case in the gap 17 to the subsequent Falklappenzylinder 18. For this purpose, the transport cylinder 11 does not necessarily have an odd-numbered division, but may also have an even division, preferably greater than 4 or 6.

Patterns A, B, C, D preferably each designate two newspaper pages, A1, A2; B1, B2; C1, C2; D1, D2 each denote a newspaper page.

Under the name Bahn 03; 04 is at least one track 03; 04, but below is preferably one of several superimposed tracks 03; 04 existing strand to understand.

The tracks 03; 04 are each printed with printing cylinders of printing units that either wear a pattern A or B on the circumference (single circumference) or two patterns A and B on the circumference (double circumference) wear. For double-circumference form cylinder, two similar patterns A, A and B, B or two different patterns A, B may be circumferentially arranged.

There are therefore four modes of operation possible.

In a first and second mode of operation both tracks 03; 04 before the first inlet 01; 02 merged on the transport cylinder 11 and separated by a single cutting operation.

The tracks carry 03; 04 in a first mode of operation one behind the other same pattern A or C and it will be on the transport cylinder 11 in a row at each Revolution same products formed and delivered directly to the subsequent jaw cylinder 18.

In a second mode of operation, the webs 03; 04 consecutive alternating pattern A, B and C, D are alternately placed on the transport cylinder 11 in a first revolution of the provided with an odd number of fields transport cylinder 11 (= collecting cylinder) and in the second revolution additionally with a second position of the folding Part of the product are provided.

In a third and fourth mode of operation, two tracks 03; 04 fed separately, wherein in the third mode of operation, the tracks 03; 04 consecutively alternately pattern A, B and C, D wear.

In this case, in a first rotation of the transport cylinder 11 (= collecting cylinder) on all and every other spur strip 16 first signatures with patterns A, C each web 03; 04 out, so now every second spur strip 16 a signature with patterns A; C carries and at the second turn are then again from each track 03; 04 two signatures with patterns B, D led to the spur strips 16.

In the second rotation of the transport cylinder 11, therefore, signatures of patterns A, C, B, D on the spur strips 16 are alternating with spur strips 16 which carry only signatures with patterns A, C, the signatures, d. H. the product with patterns A, C, B, D every other field and the jaw cylinder 18 are passed.

In a fourth mode of operation, the tracks 03; 04 consecutively same pattern A, A and C, C on, so that at each revolution of the transport cylinder 11 each spur strip 16 products with patterns A, C carries, which are passed directly to this when reaching the jaw cylinder 18.

LIST OF REFERENCE NUMBERS

01

enema

02

enema

03

Material web, paper web, first web, inner web

04

Material web, paper web, second web, outer web

05

-

06

pair of drawing rollers

07

pair of drawing rollers

08

cutting gap

09

cutting gap

10

-

11

transport cylinder

12

cutting cylinder

13

cutting cylinder

14

cutting blade

15

abutment

16

Holding device, spur strip

17

gap

18

jaw cylinder

19

paddle wheel

20

-

21

conveyor belt

22

wave

23

Point needles

24

Signature, product

25

-

26

gap

27

Signature, product

28

strip

29

groove

30

-

31

-

32

segment

33

header

16 '

Holding device, spur strip

16 "

Holding device, spur strip

16. *

Holding device, spur strip

16 **

Holding device, spur strip

16 ***

Holding device, spur strip

32 *

segment

32 **

segment

A

Pattern, signature with pattern, product with pattern

B

Pattern, signature with pattern, product with pattern

C

Pattern, signature with pattern, product with pattern

D

Pattern, signature with pattern, product with pattern

Claims (12)

1. Cutting device for transverse cutting of at least one material web (03; 04) comprising a transport cylinder (11), the transport cylinder (11) being arranged so as to form a first cutting nip (08) with a first crosscutting device (11; 12), the transport cylinder (11) additionally being arranged so as to form a second cutting nip (09) with a second crosscutting device (11; 13), first crosscutting device (11; 12) and second crosscutting device (11; 13) being arranged offset in the circumferential direction of the transport cylinder (11), characterized in that the crosscutting devices (11, 12; 11, 13) have in each case a cutting cylinder (12; 13), in that the transport cylinder (11) and a first cutting cylinder (12) are rotatable together and bound a first cutting nip (08) through which a first transport path for a first material web (03) to be cut runs, the first cutting cylinder (12) carrying at least one cutting knife (14) for cutting off a first signature (24) from the first material web (03) during passage of the cutting knife (14) through the first cutting nip (08), in that a second transport path for a second material web (04) to be cut meets the first transport path on the transport cylinder (11), and in that a second cutting cylinder (13) is rotatable together with the transport cylinder (11) and together with this bounds a second cutting nip (09) through which both transport paths run, the second cutting cylinder (13) carrying at least one cutting knife (14) for cutting off a second signature (27) from the second material web (04) during passage of the cutting knife (14) through the second cutting nip (09), and in that the rotation of the two cutting cylinders (12; 13) is synchronized so that the second cutting knife (14), during its passage through the second cutting nip (09), meets a cut in the first material web (03), which cut is produced by the first cutting knife (14).
2. Cutting device according to Claim 1, characterized in that the transport cylinder (11) has an abutment (15) for a cutting knife (14).
3. Cutting device according to Claim 1, characterized in that the first crosscutting device (11, 12) is arranged so as to cut through a first material web (03) and the second crosscutting device (11, 13) is arranged so as to cut through a second material web (04).
4. Cutting device according to Claim 1, characterized in that the second crosscutting device (11, 13) is arranged on the circumference of the transport cylinder (11) so as to cut with a phase offset.
5. Cutting device according to Claim 4, characterized in that, on the transport cylinder (11), the cut of the first crosscutting device (11, 12) is effected close to, in particular less than 10 mm from, a cut of the second crosscutting device (11, 13).
6. Cutting device according to Claim 1, characterized by means (16; 16'; 16"; 16*; 16**; 16***; 32*; 32**, 33) for drawing apart the cut edges produced by the first cutting knife (14) during cutting of the first material web (03) on said material web.
7. Cutting device according to Claim 6, characterized in that the means (16; 16'; 16"; 16*; 16**; 16***; 32*; 32**, 33) for drawing apart the cut edges comprise a holding device (16"; 16**) for holding the first signature (24) cut off and for moving the first signature (24) in a direction opposite to the transport direction before the second cutting nip (09) is reached.
8. Cutting device according to Claim 6 or 7, characterized in that the means (16; 16'; 16"; 16*; 16**; 16***; 32*; 32**, 33) for drawing apart the cut edges comprise a holding device (16"'; 16***) for holding the second signature (27) cut off and for moving the second signature (27) in the transport direction after passage through the second cutting nip (09).
9. Cutting device according to Claims 7 or 8, characterized in that the holding device (16; 16'; 16"; 16*; 16**; 16***) is a pin strip (16; 16'; 16"; 16*; 16**; 16***).
10. Cutting device according to any of Claims 6 to 9, characterized in that the means (16; 16'; 16"; 16*; 16**; 16***; 32*; 32**, 33) for drawing apart the cut edges comprise a groove (29) on the transport cylinder (11) and a strip (28) cooperating with the groove (29) and present on the second cutting cylinder (13).
11. Cutting device according to Claim 1, characterized in that the circumference of the transport cylinder (11) is at least five signature lengths.
12. Cutting device according to any of the preceding claims, characterized in that a lead-in (01; 02) is coordinated with each material web (03; 04).

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