EP2347899B1 - Folding machine - Google Patents

Description

The invention relates to a folding unit and a method for producing a printed product.

In rotary printing machines, the length of the manufacturable benefits is determined by the scope of the printing cylinder. Such systems are limited to the production of printed products, the format either fill the entire circumferential length of the printing cylinder or can be arranged two or more times on an associated printing plate in a row. Printed products with formats - in particular with section lengths in web-fed rotary printing presses - which are only slightly shorter, ie do not correspond to an integer multiple of the printing plate length, can not be produced.

In commercial printing, it is well known, especially on higher quality printed products after printing and folding to cut off a marginal area to any traces of holding devices, such as punctures of puncturing needles or prints of grippers, or print control strips required to verify the print quality were to be eliminated.

For this purpose, cutting devices are arranged on folders of commercial printing presses in the production flow after folding, which trim the folded products with a knife / counter blade arrangement. Such cutting devices for so-called paper cuts perform clean cuts, as required in particular for high-quality printed products.

However, it is very complicated to adjust corresponding cutting devices with respect to the interaction of the cutting edges on each other and such cutting devices can only sever a limited number of layers.

From the post-published citation WO 2010/061695 A1 is a folding apparatus for separating an incoming printing material web with a first cutting device for separating the incoming web into individual signatures by cross-cutting known, in which the signatures are laterally folded transversely, transported away by means of a transport device from the folding cylinder group and then cut with a second cutting device.

The EP 0 302 489 A2 discloses a folding apparatus according to the preamble of claim 1, wherein the further cutting device is associated directly with the jaw cylinder. In the DE 10 2007 025 797 A1 the further cutting device interacts directly with the folding blade cylinder. Also in the DE 10 2006 057 569 A1 the further cutting device interacts directly with the folding blade cylinder.

The object of the invention is to provide a folding unit with which a first section length of printed products can be shortened.

This object is achieved by the features of claim 1.

By means of a folding unit according to the invention, it is advantageously possible to shorten the section length of a printed product fixed by the cylinder circumference of a printing press, ie to produce printed products having a shorter section length than the predetermined section length, this section length not having to be an integer multiple of the printing cylinder circumference or the associated printing plate.

By the execution of the further cutting device, it is advantageously possible to cut off a larger number of paper layers.

Furthermore, it is advantageously possible in a folding apparatus according to the invention, in the remaining area of the outer surface of the folding blade, to arrange a stapler, which is particularly advantageous easily accessible.

Other features and advantages will become apparent from the dependent claims in conjunction with the description.

• Fig. 1 zeigt ein erfindungsgemäßes Falzwerk,
• Fig. 2 stellt ein mit dem erfindungsgemäßen Falzwerk herstellbares Druckprodukt dar und
• Fig. 3 ist eine vergrößerte Darstellung der weiteren Schneideinrichtung 18 aus Fig. 1.

The invention will be explained in more detail with reference to the accompanying schematic drawings. The

• Fig. 1 shows a folding unit according to the invention,
• Fig. 2 represents a producible with the folding unit according to the invention and printed
• Fig. 3 is an enlarged view of the further cutting device 18 from Fig. 1 ,

In FIG. 1 can be seen how one or more in a non-illustrated web-fed rotary printing machine printed substrate webs are guided over formers 5 and provided with Längsfalzen. The resulting longitudinally folded printing material webs are then combined to form a total strand 13, from which individual benefits are separated in a cutting device 11.

The cutting device 11 is formed by a cutting cylinder 9, which preferably carries at its periphery two cutting blades and cooperates with counter cutting strips, which are arranged on the folding blade 14.

The separated benefits are held by holding devices, such as point needles, on the lateral surface of the folding blade 14 and in Direction of arrow further promoted. Once the benefits or printed products are in the range of a jaw cylinder 15 they receive a transverse fold by a folding blade of the folding blade 14 extends and pushes the printed products in a jaw of the jaw cylinder 15.

The jaw cylinder 15 conveys the quergefalzten printed products, which are held in the jaw in the direction of arrow and passes them to a conveyor 17. The conveyor 17 is preferably designed as a ribbon cable.

The conveyor 17 transports the printed products, preferably newspapers, with their transverse fold directed forward to a further cutting device 18. This further cutting device 18 consists of a cutting cylinder 19 and a cutting bar cylinder 20, which act on the trailing edge of the printed product and there a portion of the printed product split off. Thus, the printing length of the web-fed rotary printing press corresponding section length is shortened on the printed product 12.

In the remaining free area of the lateral surface of the folding blade cylinder 14 namely after the cutting cylinder 9, a stapler 8 is preferably arranged. With this stapler 8, the benefits separated from the total strand 13 can be stapled together. Due to the otherwise unobstructed space in this area of the folding blade 14, the stapler 8 is easily accessible. That means he is easy to build or maintain and maintain.

A folding apparatus according to the invention can be designed both with and without a stapling apparatus.

In FIG. 3 the further cutting device 18 is illustrated enlarged enlarged. The cutting cylinder 19 is provided with two cutter bars 22, which cooperate with a cutter bar 23 of the cutter bar cylinder 20, respectively. Of the total strand 13 ( Fig. 1 ) Separated printed products 12 are - ahead with their transverse fold 16 - between the cutting cylinder 19 and the cutting bar cylinder 20 passed, wherein a portion 31 is separated. This section 31 is held by puncturing needles 24, which are preferably arranged on the cutting bar 23, and transported in the indicated direction of rotation of the cutting bar cylinder 20 to the suction device 30. The suction device 30 sucks the section 31 off the puncturing needles 24. In order for the portion 31 to more easily detach from the puncturing needles 24, the puncturing needles 24 can be moved back in a controlled manner, thereby stripping the portion 31 of the puncturing needles 24.

The further cutting device 18 is driven by a drive independent from the folding unit 10, which can be controlled so that the cutting device 18 can be operated at different speeds during one revolution, being operated at about the speed of movement of the printed product / useful 12 during the cutting process , Thereby, the length L of the section 31 can be changed.

So that advantageously only half of the paper layers have to be cut off from the further cutting device 18, the transverse fold 16 is preferably arranged asymmetrically and the portion 31 to be separated is placed in the longer leg. That is, the printed image with the shorter section length compared to the length prescribed by the printing cylinder must be arranged on the printing plate accordingly.

How out FIG. 3 As can be seen, the printed product 12 on an asymmetrical transverse fold 16, so that only the lower half of the paper layers must be separated. The illustrated printed product 12 is located in FIG. 3 on its title page which is obviously longer than the shorter pages behind it. In this case, one usually speaks of a so-called pre-fold. In the opposite case - that is, if the pages behind are longer - one speaks of a Nachfalz.

In order to produce an asymmetrical transverse fold with the folding unit 10, only the distance of the folding blades relative to the holding means, i.e. in a generally known manner, must be maintained. be adjusted the edge of the printed product.

In the example described according to FIG. 3 should also after removal of the section 31 a small supernatant - a prefold 28 - remain on the shortened printed product.

In FIG. 2 the printed product 12 is shown schematically. At one edge, the puncture stitches 32 of the holding devices of the folding blade cylinder 14 can be seen, and at the other edge, the cutting line 35 can be seen, through which the printed product 12 was separated from the total strand 13 by the cutting device 11. Furthermore, the cutting line 36 is shown, through which the further cutting device 18 shortens the format length / section length of the printed product. The printed product 12 may in its simplest variant in transverse folded form comprise four paper layers. The circumference of the paper layers increases according to the number of paper layers which are fed via the former 5 (FIG. FIG. 1 be folded along.

The section 31 is preferably disposed of as waste. However, it is also conceivable to print the section 31 and to use it as a benefit.

LIST OF REFERENCE NUMBERS

5

formers

8th

stitcher

9

cutting cylinder

10

folding

11

cutter

12

Use / print product

13

total strand

14

folding blade

15

jaw cylinder

16

cross fold

17

Conveyor

18

cutter

19

cutting cylinder

20

Cutting bars cylinder

21

Conveyor

22

cutter bar

23

cutting bar

24

Puncturing needle

25

paddle wheel

26

paddle wheel

27

display

28

prefold

30

suction

31

section

32

Punkturstich

35

intersection

36

intersection

L

Length of section 31

Claims (4)

1. A folding unit (10) comprising a cutting device (11) for separating individual panels (12) from a printing material web (13), comprising a folding blade cylinder (14) and a folding jaw cylinder (15), for attaching a transverse fold to a panel (12), and comprising a further cutting device (18), wherein the further cutting device (18) consists of a cutting cylinder (19) comprising at least one knife bar (22) and a cutting strip cylinder (20) comprising at least one cutting strip (23), characterized in that the folding jaw cylinder (15) transfers transversely folded panels (12) to a conveying device (17) for transporting the transversely folded panels (12) in the direction of the further cutting device (18), and that the further cutting device (18) has its own drive, which is independent of the folding unit (10).
2. The folding unit according to claim 1, characterized in that the further cutting device (18) can be operated at different circumferential speeds during a rotation, whereby it can be operated at the movement speed of the panel (12) during a cutting process.
3. The folding unit according to one of the preceding claims, characterized in that a suction device (30) for discharging sections (31) is arranged on the further cutting device (18).
4. The folding unit according to one of the preceding claims, characterized in that the folding blade cylinder (14) and the folding jaw cylinder (15) can be adjusted in such a way that the transverse fold (16) can be asymmetrically attached to the panel (12), whereby a front fold or a back fold is created and the front fold or the back fold, respectively, can be cut off by means of the further cutting device (18).

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