JP2009040535A - Control method of register for cutting in web press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling the registration for cutting in the transverse direction of a web press, in particular, a newspaper press. <P>SOLUTION: The method comprises (a) a step of acquiring an estimated error of the cutting in the transverse direction by a sensor for each web or each partial web before forming each ribbon in an area of a leading roller group, and of controlling the registration for cutting by turning a plate barrel engaged in the printing of each web or each partial web based on the acquired estimated error of the cutting in the transverse direction of each web or each partial web, and (b) a step of acquiring the estimated error for cutting in the transverse direction at least for several ribbons before forming a ribbon assembly in an area above a folding device separately from the step (a), and controlling the registration for cutting by moving a registration roller arranged behind a former of performing the longitudinal folding of each ribbon based on the acquired estimated error of the cutting in the transverse direction of these ribbons. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a registration control method for lateral cutting in a web rotary printing press, particularly a newspaper printing press.

  In a web rotary printing machine, for example, a newspaper printing machine in particular, printing of a plurality of substrate webs is performed in a printing unit constituting a printing tower. When printing is performed on a printing material web, the printing material web is generally divided into a plurality of partial webs by longitudinal cutting. At this time, in a region of a so-called leading roller group, printing made by vertical cutting is performed. Partial webs of the finished web are stacked in a plurality of ribbons. It goes without saying that a plurality of printed uncut webs can be stacked in a plurality of ribbons in the area of the leading roller group. These ribbons are longitudinally folded in a former region placed behind the leading roller group, and these longitudinally folded ribbons are combined into one ribbon assembly in the upper region of the folding device. This ribbon assembly is cut in the transverse direction in the region of the cutter cylinder in the region of the folding cassette placed on the upper part of the folding device, and the printed matter is separated into each part. At this time, the ribbon assembly is cut in the lateral direction. The printed matter separated into each part by the above is then folded in the transverse direction in the folding cassette.

  As described above, in the area of the cutter cylinder of the folding cassette, the printed material is separated into each part from the ribbon assembly by lateral cutting, and at this time, the edge of each part of the printed material created by the lateral cutting is removed from the printed image. It is important to maintain a predetermined distance. The predetermined distance between the edge of each part of the printed material and the printed image of each part of the printed material generated by the horizontal cutting is called a cutting register.

Patent Document 1 discloses a registration control method for cutting in a web rotary printing press. In the control method, each acquired value for the cutting position of each web is acquired by the web ribbon sensor before the webs are combined into one ribbon, and a measurement for the cutting position of the web in the ribbon. The value is further acquired by one batch ribbon sensor. These measurements are evaluated by a common control device to determine and control the web cutting position. Since the registration control for cutting is performed by such a complicated method, the cost becomes high.
EP 1074501 specification

  Accordingly, it is an object of the present invention to provide a new method for cutting registration control in a web rotary printing press.

  This problem can be solved by the registration control method for cutting in a web rotary printing press according to claim 1.

The method of the present invention includes at least the following steps.
a) Before each ribbon is formed in the area of the leading roller group, an expected error of the lateral cutting is obtained by a sensor for each web or each partial web, and each web or each partial web obtained here is obtained. A step of performing registration control for cutting by rotating a plate cylinder involved in printing of each web or each partial web based on an expected error of the horizontal cutting.
b) Apart from the transverse cutting control for each web or each partial web, the expected error of the transverse cutting is due to at least some ribbons before the ribbon assembly is formed in the upper region of the folding device. Based on the estimated error of the horizontal cutting of these ribbons acquired here, the registration roller for cutting is controlled by moving the registration roller placed on the former that performs the vertical folding of each ribbon. Step to do.

  The present invention provides cut registration control in a web rotary printing press by correcting the expected error in lateral cutting for each web or each partial web, regardless of the expected error in ribbon lateral cutting. Suggest a method. Thereby, a simpler control structure for controlling the lateral cutting error in the web rotary printing press can be realized.

  It is desirable that the expected error of the horizontal cutting is obtained only for the balloon former disposed on the main former and, in some cases, the ribbon folded longitudinally by the trip former.

  According to a preferred development of the invention, the expected error of one transverse cut for the ribbon assembly is at least several in the area of the cut registration control for each web or each partial web and in the area of the cutter barrel of the folding cassette. Is obtained separately from the cutting registration control for the ribbon, and the registration roller for guiding the ribbon of the ribbon assembly is guided based on the obtained error in the horizontal cutting for the ribbon assembly. By moving, the trimming registration is controlled.

  Preferred developments of the invention can be seen from the dependent claims and the following description. Embodiments of the present invention will be described in detail below with reference to the drawings, but are not limited thereto.

  1 and 2 show a cross section of a web rotary printing press configured as a newspaper printing press. In FIG. 1, three printing towers 10, 11, 12 are shown. Each printing tower comprises a printing unit 13 configured as a 9-cylinder satellite printing unit.

  The substrate web supplied to the printing towers 10, 11, 12 via the roller changer 14 is printed in the printing unit 13 of the printing towers 10, 11, 12. At this time, the printed material web printed in the printing device 13 of the printing tower 10, 11, 12 is preferably cut in the longitudinal direction in the turning bar unit 15 and divided into partial webs after printing.

  In the illustrated embodiment, after the printed web is divided into partial webs, these partial webs are fed to a so-called leading roller group 16, where the partial webs are in the form of a plurality of ribbons in the region of the leading roller group 16. It will be overlaid on. In the illustrated embodiment, two leading roller groups 16 are arranged one above the other, and each partial web is supplied to one of the two leading roller groups 16.

  In the illustrated embodiment, three formers 17 or 18 are placed behind the two leading roller groups 16, respectively, and the ribbon formed in the area of the leading roller group 16 is folded vertically in the formers 17 or 18. The lowermost former 17 is called a main former, and the former 18 arranged on the former 17 is called a balloon former. On the leading roller group 16 located on the balloon former 18 and assigned to the balloon former, a further unit comprising one leading roller group and a former disposed behind the leading roller group is arranged. In this case, the former is also called a trip former.

  A binder 19 for putting the ribbons vertically folded in the region of the main former 17 together is placed on the main former 17.

  Below the main former 17, the vertically folded ribbons are grouped into one ribbon assembly in the region of the folding device upper portion 20, and at this time, the ribbon assembly formed in the folding device upper portion 20 is folded into a folding cassette. 21 is supplied. The ribbon assembly is cut in the lateral direction in the region of the cutter cylinder 22 of the folding cassette 21, and the printed material is separated into each part. Next, the printed material separated into these parts is folded in the folding cassette 21.

  The present invention relates to a registration control method for lateral cutting in a web rotary printing press. According to the present invention, an edge of a printed material, which is made by cutting the ribbon assembly in the region of the cutter cylinder 22 in the region of the cutter cylinder 22 by the register for cutting, and the printed image of each part of the printed material is separated. The distance can be determined.

  The method of the present invention provides a sensor (not shown) for each partial web before each ribbon is formed in the area of the leading roller group 16 in a first step to provide trimming registration control. It is proposed to obtain the expected error of horizontal cutting using. Accordingly, the cutting registration control according to the present invention rotates the plate cylinder 23 of the printing apparatus 13 involved in the printing of each partial web based on the obtained predicted error in the horizontal cutting for the partial web. Is done by. In the present invention, the obtained value of the predicted error of the horizontal cutting obtained for each partial web in the area of the leading roller group 16 is used only for rotating the corresponding plate cylinders 23 in the present invention.

  In the present invention, in the region of the upper part 20 of the folding device, the expected error of the lateral trimming is due to the partial web before the ribbon assembly is formed from at least some ribbons formed in the region of the leading roller group 16. Is obtained separately from the above-mentioned registration control for horizontal cutting.

  The registration control for cutting is performed by adjusting a registration roller 24 placed behind a former that vertically folds each ribbon based on the obtained error in the horizontal cutting for the ribbon. Each of the expected errors in the lateral trimming for the ribbon, acquired before the ribbon assembly is formed in the region of the folding device top 20, is used only to adjust the registration roller 24.

  In the illustrated embodiment, the registration roller 24 is placed only on the balloon former 18 because the space between the main former 17 and the upper part 20 of the folding device is narrow. Since the space between the main former 17 and the folding device upper portion 20 is narrow as described above, when the ribbon folded vertically in the main former 17 is conveyed to the folding device upper portion 20, there is almost no deviation with respect to the registration for cutting. This is because it does not occur. Where trip formers are provided, a registration roller is placed behind each of these trip formers.

  In each of the embodiments of FIGS. 1 and 2, the expected error in lateral cutting is within the balloon former 18 located in the main former 17 and possibly in the trip former located above the balloon former. Obtained only for ribbons that are folded vertically.

  The registering control for cutting in the present invention is based on two control circuits that function independently of each other. The first control circuit controls the plate cylinder 23 of the printing apparatus 13 based on the predicted error in the lateral cutting for each partial web acquired in the area of the leading roller group 16. On the other hand, the second control circuit controls the registration roller 24 separately from the first control circuit based on an expected error in the lateral cutting of the ribbon in the region of the upper portion 20 of the folding device.

  In a preferred development of the invention, a third control circuit can be provided. The third control circuit functions separately from the two control circuits, and obtains an expected error of the lateral cutting for the ribbon assembly in the region of the cutter cylinder 22 of the folding cassette 21. It is desirable that the third control circuit controls the registration roller 24 on which the ribbon of the ribbon assembly is guided based on the obtained estimated error in the lateral cutting for the ribbon assembly.

  A registration roller is placed behind the main former 17, and the registration roller is a lateral cut obtained for the ribbon in the region of the folding device upper part 20 or the ribbon assembly in the region of the cutter cylinder 22. It should be noted that control is possible based on the expected error.

It is a front view of a web rotary printing machine for clarification of the method of the present invention. FIG. 2 is a side view of FIG. 1 to further clarify the method of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Printing tower 11 Printing tower 12 Printing tower 13 Printing unit 14 Roll paper changer 15 Turning bar unit 16 Leading roller group 17 Former 18 Former 19 Binder 20 Folding device upper part 21 Folding cassette 22 Cutter cylinder 23 Plate cylinder 24 Registration roller

Claims (3)

A plurality of substrate webs are printed in the printing unit (13), and a plurality of partial webs obtained by printing a plurality of uncut webs or by cutting a printed web in the longitudinal direction is a leading roller group ( 16), the ribbons are overlapped in the form of a plurality of ribbons, and these ribbons are vertically folded in the formers (17, 18) placed behind the leading roller group (16), and these vertically folded ribbons are folded. In the region of the upper part (20) of the apparatus, the ribbon assembly is combined into one ribbon assembly, the ribbon assembly is cut laterally by the cutter cylinder (22) of the folding cassette (21), and the printed matter is separated into parts. The printed matter of each part is in a method for registering control for lateral cutting of a web rotary printing machine, particularly a newspaper printing machine, which is at least horizontally folded in a folding cassette (21). ,
a) Before each ribbon is formed in the area of the leading roller group (16), the expected error of the lateral cutting is obtained by the sensor for each web or each partial web, where each web or each Cutting registration control by rotating the plate cylinder (23) involved in printing each web or each partial web based on the expected error of the partial web lateral cut; and
b) Separately from step a), before the ribbon assembly is formed in the region of the upper part of the folding device (20), the expected error of the transverse cut is obtained for at least some ribbons, and these obtained here A step of performing registration control for cutting by moving a registration roller (24) placed on the former (18) for longitudinally folding each ribbon based on an expected error in the horizontal cutting of the ribbon;
A method characterized by comprising at least.   In step b), the expected error of the lateral cutting is determined only for the balloon former (18) arranged on the main former (17) and possibly the ribbon folded longitudinally in the trip former. The method according to claim 1.   Apart from steps a) and b), the expected error of the lateral cutting for the ribbon assembly is acquired in the region of the cutter cylinder (22) of the folding cassette (21), and the acquired lateral direction of the ribbon assembly The registration control for cutting is performed by moving a registration roller (24) through which a plurality of ribbons constituting the ribbon assembly are guided based on an expected error of cutting. Item 3. The method according to Item 2.

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