EP1650152B1 - Folding device for a rotary printing machine. - Google Patents

Description

The invention relates to a folding device for a rotary rotary printing machine for performing a Querfalzvorganges to cross-cut a printing medium, in particular a paper web, and to collect separated products, according to the patent claim 1.

Various folding devices are known in the prior art for processing paper webs. Thus, it is in the newspaper and magazine printing quite the case that a cross-cutting of the paper web is performed with a smooth or finely toothed knife that works against a hard rubber strip. In the case of magazines, it is necessary to subsequently remove unsightly edge areas during further processing when cutting with fine-toothed knives. In order to be able to cut and transport the high-speed paper web, it is necessary to use puncturing devices to detect the end of the paper web to be processed, whereby cut-off components of the paper web can also be taken through puncturing devices. Needle punctures by the puncturing device as well as serrated interfaces can be removed when trimming the printed product. Furthermore, it is possible to make a format trimming with the folding device, which comprises a cylinder arrangement with a collecting cylinder and a knife cylinder, which can also be adjusted to different lengths of printed products. For the different setting, it is necessary to use instead of an array of cutting blades together with Punktureinrichtung, also called cutter bar, to use a different cutter bar for each format, in which the knife spacing of two arranged on the cutter bar knives differs, thus defining the section length.

The EP 0 023 630 Al discloses a folder on rotary rotary printing machines, in which a collecting cylinder is arranged opposite a knife cylinder, Punkturreihen are permanently installed in the collecting cylinder. The knife cylinder has cutter bars, which consist on the one hand of a single blade and on the other hand of a pair of cutting blades. This arrangement does not allow maximized transport speeds for the printed paper web.

According to another example of a folding device according to the prior art, a puncturing device is provided in a knife bar centrally between two cutting blades in order to dispose of cut off parts of a paper web. Also, this folding device does not allow optimized transport speed and thus no optimized production speed.

It is accordingly the object of the present invention to propose a folding device which allows an increased transport speed for an endless printed product to be singulated.

The object is achieved according to the invention by a folding device with the features of claim 1.

The advantages obtainable according to the invention are based on the fact that the puncturing device of an arrangement, referred to below as knife bar, is installed by two cutting blades with a leading and a trailing cutting blade 16 in such a way that the puncturing device 13 is installed at a distance X from the leading blade 15 , wherein the distance X is smaller than the distance of the puncturing device 13 to the trailing knife.

Already by this arrangement, it is possible to avoid the exhaust of unseparated and separated components of the paper web or the print medium even at high speeds. The lifting of the paper web and its cut-off components can be prevented according to the invention even at extremely high speeds, so that a controlled transport is possible and service life due the tear or the tearing of the paper web can be avoided even at high transport speeds.

It has proven particularly advantageous if a puncturing axis of the puncturing device is inclined by an angle α to the leading knife. In this way, the venting or lifting of the printing medium or the paper web or a portion of the paper web can be reliably prevented at even higher speeds. Particularly advantageous are inclination angles α of 5 to 20 ° for the inclination of the puncturing axis of the puncturing device to the leading knife. The speed increase for the transport is surprisingly large.

Even if a puncture axis of the puncturing device, which extends axially through the puncturing device, is aligned parallel to the axis of the leading knife, at the same time the distance between the leading knife and the Punkturachse preferably in a range of 4 to 20 mm and in particular 8 to 12 mm can achieved a remarkable increase in the transport of the printing medium and in particular the paper web, without an exhaust occurs.

The puncturing devices have a plurality of puncturing needles in the transverse direction of the paper web, so that a plurality of puncturing devices can be arranged along a bar.

In order to be able to cut different formats, it is expedient according to the invention if two of the arrangements, respectively the cutter bar, are reversibly installed in the knife cylinder, which are arranged substantially opposite each other. This arrangement makes it possible to produce different lengths of printed copies, namely at a very high transport speed according to the invention. An interchangeability of the arrangements or cutter bar is required in order to contribute to the variable use of the folding device according to the invention for cutting different print product sizes. For each different size of a printed product, a different cutter bar or a different arrangement of a leading and a trailing knife is required in connection with a puncturing device:

It is particularly advantageous if at least one of the arrangements is laterally displaceable by the knives together with puncturing device or cutter bar, so that a format trimming is made possible both for a simple and for a collective production, whereby in this way one printed product has a different one from the other printed product Dimension will have. For example, two paper webs run in parallel and are then processed by different cutter bars.

Advantageously, the puncturing devices of the knife cylinder can be moved back and forth by means of moving devices, these movements being naturally controlled. A corresponding control takes place relative to the collecting cylinder or of puncturing devices in the collecting cylinder, which are provided for the transport of the printed products or the web of the printing medium. For the forward and / or backward movement of the puncturing devices, mechanical, electromechanical or even electrical devices may be provided, such as a cam, which acts on the puncturing devices with the rotation of the knife cylinder. Stepping motors for the puncturing devices or electromagnetic devices such as electromagnets or the like can also be used.

In a preferred embodiment of the invention, the leading part of the web of the printing medium is punctured by the puncturing means of the knife cylinder and thus detected. The rotation of the knife cylinder causes a transport and subsequently the leading edge of the print medium is trimmed. The cut-off portion of the printing medium is carried by the puncturing means of the knife cylinder carried to a removal device. This is usually a suction that sucks the separated sections and removed from the production process. The printing medium is subsequently punctured by point devices of the collecting cylinder practically simultaneously, so that the collecting cylinder can further transport the web of the printing medium. In this way, the printing medium is now brought into contact with the trailing cutting blade of the knife cylinder and thereby the rear part of the reject section is separated from the web of the pressure medium. The cut off piece can be carried on by the puncturing of the knife cylinder and then be disposed of via the suction mentioned. In this case, the puncture device must be withdrawn during the further transport of the committee again, on the one hand to enable the release of the committee and on the other hand to enable the stripping of the committee piece. The incoming web of the printing medium is thus decomposed into a reject section and a copy component of a printed product, the rejects being conveyed by the puncturing device of the knife cylinder into a suction device, while the collecting cylinder further conveys the separated printed product, in particular into the collecting pockets of paddle wheels, which subsequently the Lay out printed matter on a conveyor belt.

Figur 1

eine erste Ausführungsform gemäß der Erfindung in einer schematischen Schnittdarstellung;

Figur 2

eine zweite Ausführungsform der Erfindung in einer Schnittdarstellung; und

Figur 3

die Ausführungsform gemäß Figur 2 in einer anderen Funktionssituation.

In the following, the following invention will be described with reference to two preferred embodiments according to the invention, wherein further features, advantages and objectives according to the invention are disclosed. In the illustrations show:

FIG. 1

a first embodiment according to the invention in a schematic sectional view;

FIG. 2

a second embodiment of the invention in a sectional view; and

FIG. 3

the embodiment according to FIG. 2 in another functional situation.

In the FIG. 1 a knife cylinder 1 is shown, to which a suction device 21 is connected to dispose of the knife cylinder cut sections of a web-like printing medium 4. The knife cylinder 1 is opposite a collecting cylinder 2, which is separated from that of the web-like printing medium 4, hereinafter referred to as paper web 4, printed products 5 and passes on to the subsequent processing.

The collecting cylinder 2 runs substantially at the same speed as the knife cylinder 1, so that the individual processing and transport components of the cylinder can perform a timed processing.

The Messerlzylinder 1 has at least one leading or trailing cutting blade, which serves to separate printed products from the paper tape. The collecting cylinder 2 has a Punkturspindel 7 with a pivotally fixed thereto Punkturhebel 18 on, at the end of a Punkturspitze is provided which punctures the paper web and subsequently selected printed copies, thus detected and transported. Between two cutting pads 19, 20, a recess is provided, in which a Punkturspitze a puncture device 10, 11, 12, 13 is able to engage the opposite knife cylinder 1. The cutting pads 19, 20 are associated with respective cutting blades 15, 16 of the knife cylinder 1. Accordingly, the cutting pads, in particular cutting rubbers 19, 20 have approximately the same distance from each other as the cutting blades 15, 16 of the knife cylinder. 1

The knife cylinder 1 has respective arrangements of the cutting blades 15, 16 and the puncturing device 10, 11, 12 and 13. Concentric with the knife cylinder axis, a cam 9 is provided, which acts on the puncturing device 10, 11, 12, 13 via a cam roller in order to advance the tip of the puncturing device in order to puncture the paper tape. Accordingly, the cam plate 9 has control portions in the circumferential direction to advance the puncturing means 10, 11, 12, 13 while a spring 12 moves the puncturing means back when a cam portion of a cam 9 comes into abutment with the cam roller 10 on the rear side of the puncturing means retracting radially to expose the spring 12, whereby the spring 12 moves back the puncturing needle, the longitudinal axis 13 of which is indicated, to release the needled piece of paper.

The arrangement of the cutting blades 15, 16 in conjunction with the puncturing device, which is also referred to as a knife bar, is held over respective, opposing terminal strips 23, of course, a single terminal block or more than two terminal strips can be used to the cutter bar reversible and Coaxial to the cylinder axis of the knife cylinder 1 to keep displaced. It can be seen that the puncturing needle is held parallel to the leading cutting blade 15, with a predetermined distance in a range of 6 to 18 mm, preferably 8 to 12 mm between the leading cutting blade 15 and the puncturing device or the tip of the puncturing device is provided.

In this embodiment, the cutting blade cylinder 2 on opposite arrangements or cutter bar, which are each mounted and held displaceably displaceable coaxially with the cylinder axis of the knife cylinder 1.

The FIG. 2 shows a second embodiment with features according to the invention, but unlike FIG. 1 the puncturing device 10, 11, 12, 13 the leading knife 15 is not parallel, but is arranged at an angle. The angle is preferably between about 5 and 20 °, preferably about 10 to 15 °. This angle α is the acute angle between the extension of the leading cutting blade 15 and the axis 13 of the puncturing device 10, 11, 12, 13. Otherwise, identical or at least functionally identical components are all marked with the same Bezugsziffem, as in the embodiment according to FIG. 1 , so that a repeated description is unnecessary.

According to FIG. 2 is the processing process for the paper web 4, 5 in one opposite FIG. 1 advanced stage. While in FIG. 1 the paper web has just been pierced by the puncturing device 10, 11, 12, 13 or whose puncture tip has been pierced and the cutting process with the leading cutting blade 15 is running straight, is in the embodiment according to FIG. 2 the cutting operation with the leading cutting blade 15 has already been completed and the paper section held by the puncture tip of the puncturing device 10, 11, 12, 13 is lifted off the surface of the collecting cylinder 2 by the rotation of the collecting cylinder 2 and the knife cylinder 1 and moved in the circumferential direction of the knife cylinder 1 , wherein the paper web 4 is severed between the trailing knife 16 and the opposite cutting pad 20. Subsequently, the separated paper section is taken by the rotational movement of the knife cylinder 1. After a certain movement, the Punkhimadel is thereby retracted that the cam roller 10 reaches a radially inwardly receding cam portion of the cam 9, whereby the spring 12 drives the puncture or puncture needle 13 inwardly into the knife cylinder 1. At the end of the rotational movement and the radially inwardly directed movement of the puncturing device 10, 11, 12, 13 of the separated portion of the paper web is released by the puncturing needle 13 and drawn into the suction 21 to be disposed of. At the same time that will

Print product 5 held by the Punkturspitze the puncturing device 7, 18, transported away while the knife cylinder 1 moves its closed pitch circle surface between the cutter bar on the collecting cylinder over. In this closed peripheral region of the knife cylinder then runs the cutting process by means of at least one of the leading or trailing cutting blade (15, 16).

In the FIG. 3 is a corresponding situation of the processing process of the paper web 4, 5 shown, in which the puncturing needle 13 of the knife cylinder 1 just transported the separated portion 6 to the suction 21, while the printed product is conveyed in the circumferential direction of the collecting cylinder 2 with the puncturing needle 14 of the collecting cylinder 2. To release the section 5, the puncturing needle 14 of the puncturing device 7 of the collecting cylinder 2 is then moved back radially or pivoted back about the Punkturspindel 7 at a corresponding point, so that then the printed product 5 can be released. At the same time, the severed portion 6 has already been moved in the circumferential direction of the knife cylinder 1 in the intake hopper of the suction 21 and after the cam roller 10 comes into contact with the radially inwardly directed cam portion of the cam, the puncturing needle of the puncturing device 10, 11, 12, 13 pulled out of the paper section 6 and the paper section 6 is disposed of in the suction from the processing process.

It is essential according to the invention is that surprisingly, a transport speed can be achieved by the device according to the invention, in particular in the embodiment according to FIG. 2 with a winding arrangement of the puncturing device or its tip to the leading cutting blade particularly stands out.

LIST OF REFERENCE NUMBERS

1

diameter cylinder

2

Puncture and folding blade cylinder

3

-

4

paper train

5

Section copy

6

trimmings

7

Punkturspindel

8th

folding-

9

cam

10

follower

11

Punkturachse

12

feather

13

Puncture (knife cylinder)

14

Puncture (collection cylinder)

15

Cutting knife leading

16

16 cutting blades trailing

17

cutter bar

18

Punkturhebel

19

Cutting rubber (trailing)

20

Cutting rubber (leading)

21

suction

22

clamping screw

23

terminal block

Claims (9)

1. A folding device for a roller rotary printing machine for performing a transverse folding procedure, in order to transversely cut a print medium (4), in particular a paper web, and to collect separated products, comprising the following features:

   - a cylinder arrangement, comprising:

   - a collecting cylinder (2) for collecting the separated products or printed copies; and

   - a knife cylinder (1) which co-operates with the collecting cylinder (2);

   - wherein the knife cylinder (1) comprises at least one, preferably two, arrangements comprising a leading cutting knife (15) and a trailing cutting knife (16), characterised in that a point hole means (10, 11, 12, 13) is provided between the leading cutting knife (15) and the trailing cutting knife (16); and

   - wherein the point hole means (10, 11, 12, 13) is assigned during operation to a cavity in the collecting cylinder, adjacent to which respective cutting supports (19, 20) are arranged;

   - wherein the point hole means is situated at a distance from the leading cutting knife (15) which is smaller than its (11, 12, 13) distance from the trailing cutting knife (16).
2. The folding device according to claim 1, characterised in that a point hole axis (11) of the point hole means (10, 11, 12, 13) which runs axially through the point hole means is inclined by an angle with respect to the leading cutting knife (15).
3. The folding device according to claim 1, characterised in that a point hole axis (11) of the point hole means (10, 11, 12, 13) which runs axially through the point hole means is orientated axially parallel to the leading cutting knife (15).
4. The folding device according to any one of claims 1 to 3, characterised in that two of the arrangements (11, 13, 15, 16) or printing beams are incorporated, preferably reversibly, into the knife cylinder (1) and are arranged substantially opposite each other.
5. The folding device according to any one of the above claims, characterised in that at least one of the arrangements (10, 11, 12, 13, 15, 16) is held such that it can be shifted coaxially with respect to the cylinder axis of the knife cylinder.
6. The folding device according to any one of claims 1 to 5, characterised in that the point hole means (10, 11, 12, 13) can be activated by means of a mechanical, electromechanical and/or electric means, for instance a cam disc (9), one or more step motors, electromagnetically or the like.
7. The folding device according to any one of claims 1 to 6, characterised in that the distance (X) from the point hole means (13) to the leading cutting knife (15) is about 6 to 20 mm, preferably 8 to 12 mm.
8. The folding device according to any one of claims 1 to 7, characterised in that the collecting cylinder comprises at least one point hole arrangement (18) which pierces and grasps the print medium, in particular a band-like print medium, in order to further transport it, when the leading cutting knife (15) of the knife cylinder (1) cuts through the band-like print medium.
9. The folding device according to any one of claims 1 to 8, characterised in that the a point hole axis (11) is orientated at an angle with respect to the trailing cutting knife (16).

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