WO2008050803A1

WO2008050803A1 - Printer and paper jointing method by paper feeder

Info

Publication number: WO2008050803A1
Application number: PCT/JP2007/070734
Authority: WO
Inventors: Minoru Sato; Koji Nishiyama
Original assignee: Mitsubishi Heavy Industries, Ltd.
Priority date: 2006-10-25
Filing date: 2007-10-24
Publication date: 2008-05-02
Also published as: EP2085343A4; EP2085343A1; US20100187348A1; JP2008105808A

Abstract

A printer and a paper jointing method for a paper feeder capable of suppressing misalignment in the vertical direction due to paper joint and realizing an improved printing quality and stable printing. The method uses a printer having a paper feeder (1) for adhering the web (7) fed out of an old reel (10A) to a rotating new reel (10B), and while performing paper jointing from the old reel (10A) to the new reel (10B), continuously feeding the paper. The distance (the tail length L) in the length direction of the overlap between the old reel (10A) and the new reel (10B) for which the paper feeder (1) performs paper jointing is shorter than the shortest distance between drive rollers which the printer has. As the distance between drive rollers is specifically the one between the blanket drums (24) of the printer (3).

Description

Specification

Paper splicing method using a printing machine and paper feeder

Technical field

TECHNICAL FIELD [0001] The present invention relates to a printing machine including a paper feeding device that performs paper splicing while a web is running, and a paper splicing method using the paper feeding device.

Background art

[0002] A rotary press includes a paper feeding device that supplies a web (roll) with a web wound in a roll shape to a printing device (see, for example, Patent Document 1). This paper feeder is configured to hold, for example, three webs. When paper is fed from one web, the second web is ready for splicing and the three webs are loaded. Is done. When the web of one web is low, it is spliced to the web of the second web. While the web is being fed from the second web, the first web is loaded and ready for splicing. In this way, the web is continuously fed from the paper feeding device to the printing device.

[0003] Paper splicing is performed during continuous running by a paster. Figures 5A and 5B are webs that have been tailored. The web 100 has a tape-like sheet member 101 attached to the outer end. The sheet member 101 has an adhesive layer formed on the front surface, and a tape-shaped bonding material 102 attached to the back surface. Due to the bonding material 102 adhering to the web 100, the web 100 is unwound at the standby time!

[0004] At the time of paper splicing, as shown in FIGS. 6A to 6C, the running paper 105 of the old reel is attached to the adhesive layer of the sheet member 101 by a not-illustrated poster. At this time, the bonding material 102 is broken and the sheet member 101 is peeled off from the web 100, so that the web 100 adheres to the traveling paper 105 and is continuously unwound. Next, the old reel is cut by the cutter provided in the paster, and the splicing is completed.

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2004-155564

Disclosure of the invention

[0005] In such a rotary printing machine, it has been found that when paper splicing is performed, misregistration occurs in the top-and-bottom direction at the paper splicing portion, and a printing phenomenon may occur when print quality is deteriorated. Les The In addition, problems such as unstable behavior of the running paper and unstable cutting may occur.

[0006] In view of the above circumstances, the present invention suppresses misregistration in the vertical direction caused by a paper splicing portion, and improves the printing quality and enables stable printing to perform splicing by a printing machine and a paper feeding device. It aims to provide a method.

[0007] As a result of intensive studies on the cause of the above problem, the present inventors have found that a double web spliced together is provided on two sets of driving rollers (for example, a blanket cylinder of a printing apparatus, a web path). It has been found that the feed amount varies greatly across the drag roller and the nibbing roller in the folding machine, which causes a misalignment in the vertical direction. The reason for this is that the paper feed force and paper pulling force increase due to the simultaneous contact of two running papers with the drive roller of the printing device, etc., and the water absorption and ink amount of the running paper are halved. It is conceivable that the physical properties of the paper change due to this, and that the drive system is loose.

In order to solve this problem, the following means are adopted in the present invention.

That is, the first aspect of the present invention includes a paper feeding device that attaches a web fed from an old reel to a new reel and continuously feeds paper while splicing from the old reel to the new reel. In the printing machine, the distance in the length direction of the overlap between the old reel and the new reel spliced by the paper feeder is the shortest distance between the drive rollers of the printing machine. Also provide a short printing press.

[0009] Further, the second aspect of the present invention is a paper feeding device in which a web fed from an old reel is bonded to a new reel, and paper is fed continuously while splicing from the old reel to the new reel. In the splicing method, after the new reel is bonded to the old reel, the distance force of the overlapping portion of the old reel and the new reel is a path through which the web passes before the web is cut. Provided is a paper splicing method for cutting the old reel so that the length is shorter than the shortest distance between the driving rollers provided above.

[0010] According to the first aspect or the second aspect, the distance in the length direction (tail length) of the overlapping portion between the old reel and the new reel that are spliced is shorter than between the shortest drive rollers. Therefore, stable registration is possible in which the double web does not straddle the two drive rollers at the same time. Examples of the driving roller include a blanket cylinder, an impression cylinder, a drag roller provided on a web path, a nibbing roller in a folding machine, and the like. Generally in the printing device It may be cut so that the tail length is shorter than the shortest distance between the specific blanket cylinders.

[0011] In the first aspect, the apparatus includes a cutter that cuts the old reel spliced to the new reel, and a control unit that controls cutting timing of the cutter. The control unit includes the old reel and the new reel. The cutting timing of the cutter may be controlled so that the distance in the length direction of the overlapping portion with the reel is shorter than the shortest distance between drive rollers provided in the printing press.

[0012] With this configuration, the cutting timing of the cutter for cutting the old reel is controlled by the control unit, so that the tail length is cut within an appropriate range.

In the above configuration, the control unit may determine the cutting timing of the cutter based on at least one of a cutter delay time, a tailoring length, and a cutter-brush distance.

[0014] With this configuration, the control unit calculates the cutting timing by the cutter to obtain the target tail length using the cutter delay time, the tailoring length, and the cutter brush distance as parameters, and the cutter is controlled.

[0015] According to the present invention, the distance in the length direction of the overlapping portion between the old reel and the new reel that are spliced is shorter than 1S between the shortest drive rollers, so that the double web straddles the two drive rollers simultaneously. Stable registration is possible without force S. Therefore, it is possible to improve the print quality. Furthermore, the cutting position can be stabilized and the web conveyance can be stabilized.

FIG. 1 is a schematic diagram showing a schematic configuration of a rotary press according to an embodiment of the present invention.

FIG. 2A is a schematic diagram showing an example of a paper splicing method and before entering the paper splicing procedure.

FIG. 2B is a schematic diagram showing an example of a paper splicing method and immediately before entering the paper splicing procedure.

FIG. 2C is a schematic diagram showing an example of a paper splicing method and showing an initial stage of the paper splicing procedure.

FIG. 2D is a schematic diagram showing an example of the paper splicing method and showing the middle stage of the paper splicing procedure.

FIG. 2E is a schematic diagram showing an example of a paper splicing method and showing the latter stage of the paper splicing procedure.

FIG. 2F is a schematic diagram showing an example of a paper splicing method and showing post-processing of the paper splicing procedure.

FIG. 3 is a perspective view showing a state of a web spliced web. FIG. 4 is a block diagram for explaining cutter control by the rotary press control device.

FIG. 5A is a perspective view showing a paper roll tailoring processing structure of a web roll.

5B is a cross-sectional view of the web tip portion of the web roll of FIG. 5A as viewed from the side.

FIG. 6A is a cross-sectional view illustrating an initial stage of a web roll paper splicing process.

FIG. 6B is a cross-sectional view illustrating the middle stage of the web splicing process.

FIG. 6C is a cross-sectional view illustrating the second half of the web splicing process.

Explanation of symbols

[0017] 1 paper feeder

3 Printing device

9 Rotary press controller (control unit)

18 Katsuta

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the present invention is applied to a newspaper rotary press for multi-page duplex printing. FIG. 1 is a schematic diagram showing an overall schematic configuration of an offset newspaper rotary press equipped with a multi-page duplex printing-multicolor printing apparatus. In the rotary press, a plurality of paper feeding devices 1 that supply the web 7, an infeed device 2 that applies an appropriate tension to the web 7, a printing device 3, and the web 7 after printing are conveyed to the folding machine 6. At the same time, the web transfer device 5 for superimposing the webs 7 and aligning the printing direction in the flow direction, the folding machine 6 for cutting the web 7 and folding it out as a signature, and the rotary press for controlling the entire rotary press. A control device (control unit) 9 is provided.

The paper feeding device 1 is configured to hold three webs each having a web 7 wound in a roll shape. When paper is fed from one roll, the second roll is ready for splicing and the third roll is loaded. When the remaining web 7 of the first web is reduced, the web 7 is spliced to the second web 7. While the web 7 is being fed from the second web, three webs are loaded and preparation for splicing is made. In this manner, the web 7 is continuously fed from the paper feeding device 1 to the printing device 3.

The infeed device 2 is provided with a dancer roller 21 for adjusting the tension and an infeed drag roller 22 for pulling out the web 7 from the paper feeding device 1. Infeed Dragro The roller 22 is composed of a pair of rollers that sandwich the web 7. The dancer roller 21 is rocked and held by an unillustrated actuator. For example, when the actuator is an air cylinder, the air pressure is set according to various operating printing conditions, and the air cylinder air pressure is changed and adjusted in the event of problems such as the balance of each web not being adjusted when adjusting the cutting position. The

The printing apparatus 3 is provided with the number of units corresponding to the number of printing colors. In this embodiment, printing devices 3a to 3d are provided as the printing device 3, and the printing devices 3a and 3b are provided with four printing units on both sides of the web, and print black, indigo, red and yellow in order from the bottom. Color printing is performed using these mixed colors. Similarly, the printing devices 3c and 3d have two printing units and print black and single colors.

[0022] The schematic structure of the printing apparatus 3a will be described as a representative. Printing is performed on the web 7 by printing units of four colors of black, indigo, red, and yellow. Here, printing on the web 7 means printing on the same area on the web 7 that flows continuously. In this way, each color is superimposed on the same area to form one picture, and multicolor printing related to the one picture is possible.

[0023] Each of the printing units A to D constituting the printing apparatus 3a is provided with various types of rollers such as a blanket cylinder 24 and a plate cylinder 23, and these various apparatuses are provided with a common motor. Power is supplied. An inking device and a fountain solution device (not shown) are provided around the plate cylinder 23! /.

Note that these printing apparatuses 3 are examples, and appropriate printing apparatuses such as a single-color printing apparatus that performs single-sided printing on both sides and a printing apparatus that performs two-color printing on one side, four colors, and the like can be used.

The printing device 3 performs predetermined printing on the web 7 supplied from the paper feeding device 1! / And supplies it to the web transport device 5. The web conveyance device 5 includes a large number of turn bars 51, and is configured to change the travel route of the web 7 from the printing device 3 and change the overlapping order. The width of the web 7 is usually 4 pages of a newspaper, and the one shown in the figure is the center of the width direction after printing is cut with a slitter. I try to overlap. In this way, the web 7 in the folding machine overlaps 8 sheets, and prints 32 pages printed with 8 sheets of 4 pages of newspaper on both sides of 2 pages wide. The folding machine is configured to discharge on one side.

[0025] The folding machine 6 superimposes a plurality of webs 7 sent from the web conveying device 5 and vertically cuts them, vertically folds them with a triangular plate 26, and further cuts and folds them in a desired manner. It is configured to discharge as a signature. An air blow device (not shown) is provided in the vicinity of the triangular plate 26, and the web 7 is separated from the triangular plate 26 by blowing air. Further, in front of the triangular plate 26, an on-folder drag roller 27 for applying tension to the upstream web 7 is provided. A nibbing roller 28 for pulling the web 7 downstream is provided inside the folder 6.

[0026] It should be noted that, after printing, if the center in the width direction is cut with a slitter and one of them is stacked on the other, it is introduced into the folding machine 6 as it is, so that a 16-page newspaper can be discharged to both sides. There is also a device that can switch and deliver a web printed by the printing devices 3a and 3b that can perform color printing to any position. To increase the number of pages, install web 7 from adjacent printing device 3, or when the number of pages is small, for example, when using 3 printing devices 3, print with the same printing device 3 depending on which 3 is used. Even the web 7 is different in the path to the folding machine 6.

[0027] Thus, the length of the web 7 from the printing device 3 to the folding machine 6 may vary depending on the operation pattern. Further, when the tension related to the web 7 fluctuates, the stretch of the web 7 changes, so the length of the web 7 from the printing device 3 to the folding machine 6 changes.

Thus, when the length of the web 7 from the printing apparatus 3 to the folding machine 6 changes, the cutting position by the folding machine 6 changes, and therefore the web 17 cannot be cut at a predetermined position.

The rotary press of this embodiment includes a compensator roller 53 that adjusts the cutting position by changing the travel path length of the web 7. The compensator roller 53 is provided with a moving means 52 for moving the compensator roller 53, a supporting means, and a position detecting device such as a potentiometer.

[0028] Next, the structure of the sheet feeding device 1 will be described in more detail. 2A to 2F are schematic diagrams sequentially showing the paper splicing procedure in this method. This method uses a flying paster that performs splicing while running the reel. In this method, as shown in Fig. 2C, as a means to accelerate the new reel 10B, it is connected to the shaft end of the reel shaft via an acceleration roller 11. A removable motor 12 is provided. In addition, as a means for controlling the amount of web fed from the old reel 10A by braking the rotation of the old reel 10A, an air brake 13 is provided which restrains and brakes the reel shaft by air pressure. The braking force of the air brake 13 is controlled by an air output from an air converter (not shown). The air converter converts the control output from the rotary press control device 9 into an air output. Further, the rotary press control device 9 outputs a control output corresponding to an operating condition such as a winding diameter by feedback control based on a deviation between the target tension and the actual tension.

First, in the normal operation state shown in FIG. 2A, the web 7 is fed out from the reel 10A, and as shown in FIG. 2B, when the winding diameter of the reel 10A that is feeding out the web becomes small, the web 7 is fed as shown in FIG. 2C. Then, the arm 15 supporting the new reel 10B and the old reel 1 OA is turned to the predetermined splicing preparation position. At the same time, the paster arm 16 is lowered, and the paster roller 17 provided rotatably on the paster arm 16 is pressed against the web 7. In addition, the acceleration roller 11 is connected to the reel shaft of the new reel 10B, the new reel 10B is accelerated by the motor 12, and the peripheral speed of the new reel 10B is determined based on the line speed (running speed of the web 7). The speed is controlled to match the target speed.

[0030] When the peripheral speed of the new reel 10B reaches the target speed, the web 7 is pressed against the new reel 10B by the paster roller 17 and the web is formed by double-sided tape (described later) tailored to the surface of the new reel 10B. Glue 7 to the new reel 10B (pasta). Next, the cutter 18 provided on the pace term 16 is operated to cut the upstream side of the bonded portion of the web 7 as shown in FIG. 2D, and the web 7 is separated from the old reel 10A. Immediately after this, the motor 12 that was driving the new reel 10B is disconnected, and air is sent to the air brake 13 at the reel shaft end of the new reel 10B to start torque control. Thereafter, as shown in FIG. 2E, the arm 15 is turned and the new reel 10B is set to the operating position. Next, as shown in Fig. 2F, the remaining core of the old reel 1 OA is replaced with the new reel 1 OD.

FIG. 3 shows a state of the web 7 bonded with a double-sided tape. The web 7B fed from the new reel 10B is spliced by the double-sided tape 19 to the web 7A fed from the old reel 1 OA which is the running paper. The distance from the double-sided tape 19 to the cutting position by the cutter 18 was about 2400 mm in the past. In this embodiment, the cutter 18 The cutting timing is controlled by the rotary press control device 9 and the tail length L is cut to be a predetermined length or less.

[0032] The length of the tail length L is set to be shorter than the shortest distance between the drive rollers that convey the web 7 used in the apparatus system. Specifically, the distance between the blanket cylinders 2 and 4 of the printing device 3, the printing unit 3 drag roller 25 near the exit of the printing device 3, the triangular plate 26 located at the entrance of the folding machine 26, the upper drag roller 27 in front of the folding machine 27, and the inside of the folding machine 6 It is set to be shorter than the distance between the nibbing rollers 28.

In this embodiment, the distance between the blanket cylinder 24 between the printing unit A on the most upstream side that performs black printing and the printing unit B that performs indigo printing of the printing apparatus 3a is the shortest (for example, 470 mm). The cutting timing is controlled by the rotary press controller 9 by the cutter 18 so that the tail length L becomes shorter. More preferably, taking into account the response speed, maximum speed, error, and distance at which the splicing can be performed reliably, the sum of the margin L1 (for example 110 cm) and the cutter-brush distance L2 (for example 218 mm) is 323 mm. In consideration of the error, it is preferable to set it to 46 Omm or less, which is slightly shorter than the distance between the blanket cylinders 24 of printing unit A and printing unit B! /.

As shown in FIG. 4, the rotary press control device 9 can change the tail length L based on the input parameters of tailoring length, cutter delay time, and cutter'brush distance L2. The cutter 18 can be controlled. These parameters are input by the user, and the tail length L can be changed as appropriate.

In the rotary printing press of the present embodiment configured as described above, the cutter 18 of the paster arm 16 is timing-controlled by the rotary press control device 9 and cut so that the tail length L is equal to or less than a predetermined length. Is done. Therefore, in this embodiment, the tail length L is shorter than the distance between the blanket cylinders 24 of the printing apparatus 3 and the printing unit B, which are between the shortest drive rollers. Do not straddle 24 at the same time. Needless to say, the two drive rolls (the blanket cylinder 24, the printing unit drag roller 25, the folding roller 27 on the folding machine 27, and the nibbing roller 28) are not simultaneously straddled.

For this reason, the paper feeding force and paper pulling force increase, the physical properties of the paper change due to the water absorption and ink amount of the running paper being halved, and the backlash of the drive system increases. Therefore, the printing apparatus 3 can achieve stable registration and improve the printing quality. In addition, stabilization of the cutting position, stabilization of web conveyance, and the like can be realized.

The driving roller mentioned in the present embodiment is an example. For example, when the blanket cylinder and the impression cylinder face each other and the web passes between them, the impression cylinder also becomes the driving roller. Needless to say, the present invention can be applied to a printing press having drive rollers of different configurations.

Claims

The scope of the claims

In a printing press equipped with a paper feeding device for continuously feeding a web fed from an old reel to a new reel and splicing the new reel from the old reel,

A printing machine, wherein a distance in a length direction of an overlapping portion between the old reel and the new reel spliced by the paper feeding device is shorter than a shortest distance between drive rollers included in the printing machine. A cutter for cutting the old reel spliced to the new reel, and a control unit for controlling the cutting timing of the cutter,

The control unit controls the cutting timing of the cutter so that the distance force in the length direction of the overlapping portion of the old reel and the new reel is shorter than the shortest distance between the driving rollers provided in the printing machine. The printing press according to claim 1.

3. The printing machine according to claim 2, wherein the control unit determines the cutting timing of the cutter based on at least one of a cutter delay time, a tailoring length, and a cutter 'brush distance. In the paper splicing method using a paper feeding device that continuously feeds the web while splicing the new reel while splicing the new reel, after the new reel is glued to the old reel, the old reel And the distance force of the overlapping portion of the new reel and the web so that the length is shorter than the shortest distance between the drive rollers provided on the path through which the web passes until the web is finally cut. A splicing method using a paper feeder that cuts the old reel.