DE102010005378A1 - folding - Google Patents

Abstract

The invention relates to a method for producing a printed product (12), in particular a newspaper, and a folding unit (10) with a cutting device (11) for separating individual sheets (12) from a printing material web (13), with a folding knife cylinder (14) and a folding jaw cylinder (15) for attaching a transverse fold to a panel (12), with a conveyor device (17) for transporting cross-folded panels (12) to a further cutting device (18), the further cutting device (18) consisting of a cutting cylinder ( 19) with at least one cutter bar (22) and a cutting bar cylinder (20) with at least one cutting bar (23).

Description

The invention relates to a folding unit and a method for producing a printed product according to the features of patent claims 1 and 9.

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 expensive 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.

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 claims 1 and 9.

By means of a folding unit according to the invention, it is advantageously possible to shorten the section length of a printed product which is fixed invariably by the cylinder circumference of a printing press, d. H. Produce printed products with a shorter than the predetermined section length, this section length does not have to be an integer multiple of the printing cylinder circumference or the associated pressure plate.

The inventive design 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.

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

1 shows a folding unit according to the invention,

2 represents a producible with the folding unit according to the invention and printed

3 is an enlarged view of the further cutting device 18 out 1 ,

In 1 can be seen as one or more in a non-illustrated web-fed rotary printing machine printed substrate webs via formers 5 guided and provided with Längsfalzen. The resulting longitudinally folded printing material webs then become a total strand 13 merged, of which in a cutting device 11 individual benefits are separated.

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

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

The jaw cylinder 15 promotes the Quergefalzten printed products that 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 another cutting device 18 , This further cutting device 18 consists of a cutting cylinder 19 and a cutter bar cylinder 20 which act on the trailing edge of the printed product and there separate a portion of the printed product. Thus, the printing length of the web-fed rotary printing machine corresponding section length on the printed product 12 shortened.

In the remaining area of the lateral surface of the folding blade cylinder 14 namely after the cutting cylinder 9 is preferably a stapler 8th arranged. With this stapler 8th can be from the total strand 13 segregated benefits are stapled together. Due to the otherwise unobstructed space in this area of the folding blade 14 , is the stapler 8th 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 3 is the other cutting device 18 enlarged shown schematically. The cutting cylinder 19 is with two cutterbars 22 provided, each with a cutting bar 23 of the cutting bar cylinder 20 interact. The of the total strand 13 ( 1 ) separated printed products 12 be - with their cross fold 16 ahead - between the cutting cylinder 19 and the cutter bar cylinder 20 passed through, with a section 31 is separated. this section 31 gets from point needles 24 , preferably on the cutter bar 23 are arranged, held and in the indicated direction of rotation of the cutting bar cylinder 20 to the suction device 30 transported. The suction device 30 sucks the section 31 from the point needles 24 from. So that the section 31 easier from the point needles 24 can replace the puncture needles 24 be moved back, causing the section 31 from the point needles 24 is stripped off.

The further cutting device 18 is preferably from one of the folder 10 driven independently, which can be controlled so that the cutting device 18 can be operated at different speeds during one revolution, while at about the rate of movement of the printed product / utility during the cutting process 12 is operated. This allows the length L of the section 31 to be changed.

This advantageously only half of the paper layers of the other cutter 18 must be cut off, the transverse fold 16 preferably arranged asymmetrically and the section to be separated 31 is placed in the longer thigh. 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 3 indicates the printed product 12 an asymmetric transverse fold 16 on, so that only the lower half of the paper layers must be separated. The illustrated printed product 12 located in 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.

To the folding unit 10 To produce an asymmetric transverse fold, only the distance of the folding blade relative to the holding devices, ie the edge of the printed product must be adjusted - in a well-known manner.

In the example described according to 3 should also after disconnecting the section 31 a small overhang - a Vorfalz 28 - remain on the shortened printed product.

In 2 is the printed product 12 shown schematically. On one edge are the Punkturstiche 32 the holding devices of the folding blade 14 visible and at the other edge is the cutting line 35 recognizable by which the printed product 12 through the cutting device 11 from the total strand 13 was separated. Furthermore, the cutting line 36 located through which the further cutting device 18 the format length / section length of the printed product is shortened. The printed product 12 may in its simplest variant in transverse folded form include four paper layers. The extent of the paper layers increases according to the number of paper layers passing through the formers 5 ( 1 be folded along.

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

Claims (6)

Folding unit ( 10 ) with a separating device ( 11 ) for separating individual benefits ( 12 ) from a printing substrate web ( 13 ), with a folding blade cylinder ( 14 ) and a jaw cylinder ( 15 ), for attaching a transverse fold to a benefit ( 12 ), with a conveyor ( 17 ) for transporting cross-folded benefits ( 12 ) to a further cutting device ( 18 ), characterized in that the further cutting device ( 18 ) from a cutting cylinder ( 19 ) with at least one cutter bar ( 22 ) and a cutting bar cylinder ( 20 ) with at least one cutting bar ( 23 ) consists. Folding unit according to claim 1, characterized in that the further cutting device ( 18 ) one from the folding unit ( 10 ) has its own independent drive. Folding unit according to claim 2, characterized in that the further cutting device ( 18 ) is operable during one revolution at different peripheral speeds, wherein during a cutting operation it is approximately at the speed of movement of the benefit ( 12 ) is operable. Folding mechanism according to one of the preceding claims, characterized in that a suction device for discharging sections is arranged on the further cutting device. Folder according to one of the preceding claims, characterized in that the folding blade cylinder ( 14 ) and the jaw cylinder ( 15 ) are adjustable so that the transverse fold ( 16 ) at the benefit ( 12 ) is asymmetrically attachable, whereby a prefold or Nachfalz arises and through the further cutting device ( 18 ) of the prefold or Nachfalz is cut off. Method for producing a printed product ( 12 ), in particular a newspaper, wherein a printing material web ( 13 ) first printed in a web-fed rotary printing press, then by a longitudinal folding device ( 5 ) is longitudinally folded and then with a cutting device ( 11 ) of a folding unit ( 10 ) individual benefits / printed products ( 12 ) of the longitudinally folded substrate web ( 13 ) are separated and cross-folded and then to another cutting device ( 18 ), where a further trimming of the printed products ( 12 ) is performed to determine the section length of the printed products ( 12 ) To shorten.

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