JP2008105808A - Printer and paper splicing method by paper feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer improved in printing quality and printing stability by restricting displacement in the vertical direction due to a paper splicing part, and to provide a paper splicing method by a paper feeder. <P>SOLUTION: In the printer comprising the paper feeder 1 for continuously feeding paper, splicing the paper from a former reel 10A to the paper of a new reel 10B by adhering a web 7 fed out of the rotating former reel 10A to the rotating new reel 10B, a longitudinal length (a tale length L) of an overlapped part of the paper of the former reel 10A with the paper of the new reel 10B spliced by the paper feeder 1 is set so as to be shorter than the minimum distance between driving rollers provided in the printer, especially a distance between a blanket cylinder 24 of the printer 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  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.

  The rotary press includes a paper feeding device that supplies a web with a web wound in a roll shape to a printing device (see, for example, Patent Document 1). This paper feeding device 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 there is less remaining web of one web, it is spliced to the second web. While the web is being supplied from the second web, one web is loaded and preparation for paper splicing is made. In this way, the web is continuously fed from the paper feeding device to the printing device.

  Paper splicing is performed during continuous running by a pasta. FIG. 5 shows a web that has 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. Since the bonding material 102 adheres to the web 100, the web 100 cannot be unwound during standby.

At the time of paper splicing, the old reel traveling paper 105 is attached to the adhesive layer of the sheet member 101 by a paster (not shown) as shown in FIG. 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 a cutter provided in the paster, and the paper splicing is completed.
JP 2004-155564 A

  In such a rotary printing press, it has been found that when paper splicing is performed, a phenomenon occurs in which registration misalignment occurs in the top-to-bottom direction and print quality deteriorates. In addition, there are cases where problems such as unstable behavior of the running paper and unstable cutting occur.

  In view of the above circumstances, the present invention provides a paper splicing method using a printing machine and a paper feeding device that can suppress misregistration in the vertical direction caused by a paper splicing portion, improve printing quality, and achieve stable printing. The purpose is to do.

  As a result of intensive studies on the cause of the above problem, the present inventors have found that a double web spliced together has two sets of driving rollers (for example, a blanket cylinder of a printing apparatus, a drag roller provided on a web path, It has been found that the feed amount changes greatly across the nipping roller in the folding machine, thereby causing 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 driving roller of the printing device, etc., and the water absorption amount and ink amount of the running paper are halved. It is conceivable that the physical properties of the paper change due to the above, 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 printing machine of the present invention is a printing machine provided with a paper feeding device that continuously feeds a paper fed from the old reel to the new reel by bonding a web fed from the old reel to the new reel. 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 driving rollers provided in the printing press.

  Further, the paper splicing method of the present invention is a paper splicing method by a paper feeding device that continuously feeds a paper fed from the old reel to the new reel by bonding a web fed from the old reel to the new reel. After the new reel is bonded to the old reel, a driving roller provided on the path through which the web passes before the web is cut until the distance between the old reel and the new reel overlaps. The old reel is cut so as to have a length shorter than the shortest distance between them.

  According to the present invention, since the distance in the length direction (tail length) of the overlapping portion between the old reel and the new reel which are spliced is shorter than between the shortest driving rollers, the double web has two driving forces. Stable registration is possible without simultaneously straddling the rollers. Examples of the driving roller include a blanket cylinder, an impression cylinder, a drag roller provided on a web path, a nipping roller in a folding machine, and the like. Generally, the distance between specific blanket cylinders in the printing apparatus is the shortest, and the tail length may be shorter than the distance between them.

  According to a second aspect of the present invention, in the printing press according to the first aspect, the cutter includes a cutter that cuts the old reel spliced to the new reel, and a control unit that controls a cutting timing of the cutter. The control unit controls the cutting timing of the cutter so that the distance in the length direction of the overlapping portion between the old reel and the new reel is shorter than the shortest distance between drive rollers provided in the printing press.

  According to the present invention, 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.

  According to a third aspect of the present invention, in the printing press according to the second aspect, the control unit is configured to cut the cutter based on at least one of a cutter delay time, a tailoring length, and a cutter-brush distance. To decide.

  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 distance between the cutter and the brush as parameters, and the cutter is controlled.

  According to the present invention, since the distance in the length direction of the overlap portion between the old reel and the new reel that are spliced is shorter than between the shortest drive rollers, the double web does not straddle the two drive rollers at the same time. , Stable registration becomes possible. Therefore, the print quality can be improved. Further, stabilization of the cutting position, stabilization of web conveyance, and the like can be realized.

  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 / multi-color 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, the printing device 3, and the web 7 after printing are conveyed to the folding machine 6. At the same time, a web transport device 5 that performs superposition of webs 7 and alignment in the flow direction printing position, a folding device 6 that cuts and folds the web 7 and carries it out as a signature, and a rotary press control device that controls the entire rotary press ( Control unit) 9.

  The paper feeding device 1 is configured to hold three webs each having a web 7 wound in a roll shape. When the paper is fed from the first web, the second web is ready for splicing and the third web 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 supplied from the second web, the three webs are loaded to prepare for splicing. In this way, 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 that performs tension adjustment and an infeed drag roller 22 that pulls out the web 7 from the paper feeding device 1. The in-feed drag roller 22 is composed of a pair of rollers that sandwich the web 7. The dancer roller 21 is rocked and held by an actuator (not shown). For example, when the actuator is an air cylinder, the air pressure is set according to various operation printing conditions, and the air pressure of the air cylinder is changed and adjusted in the event of a malfunction such as the web being unbalanced when the cutting position is adjusted. .

  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, printing black, indigo, red and yellow, respectively. Color printing is performed using the mixed colors. Similarly, the printing apparatuses 3c and 3d are provided with two printing units, and print black and single colors.

  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 region on the web 7 that flows continuously. In this way, one color is formed by superimposing the respective colors on the same region, and multicolor printing relating to the one pattern is possible.

Each of the printing units A to D constituting the printing apparatus 3a is provided with devices in various roller forms such as a blanket cylinder 24 and a plate cylinder 23, and power is supplied to these various devices by a common motor. It is like that. Around the plate cylinder 23, an ink device and a fountain solution device (not shown) are provided.
Note that these printing apparatuses 3 are examples, and appropriate printing apparatuses such as a single-color printing apparatus that performs double-sided monochrome printing and a printing apparatus that performs four-color printing on one side and two-colors on the other side can be used.

  The printing device 3 performs predetermined printing on the web 7 supplied from the paper feeding device 1 and supplies the web 7 to the web conveyance 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 in the figure, the center of the width direction after printing is cut with a slitter, and the turn bar 51 turns the width of one page on one side to the width of the other two pages. I try to overlap. In this way, the web 7 that has entered the folding machine overlaps eight sheets, and a 32-page printed matter in which eight sheets of four-page newspapers overlap on both sides of two pages in width is discharged to one side of the folding machine 6.

  The folding machine 6 superimposes a plurality of webs 7 sent from the web conveyance device 5, vertically cuts them, vertically folds them with a triangular plate 26, further cuts horizontally and folds, and discharges them as a desired folding book. It is configured as follows. An air blower (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 nipping roller 28 for pulling the web 7 downstream is provided inside the folding machine 6.

  After printing, if the center in the width direction is cut with a slitter and one is not overlapped with the other, it is introduced into the folding machine 6 as it is, so that a 16-page newspaper can be discharged on both sides. In addition, there is an apparatus that can switch and deliver a web printed by the printing apparatuses 3a and 3b capable of color printing to any position, but the illustration is omitted. When the number of pages is further increased, the web 7 is introduced from the adjacent printing device, or when the number of pages is small, for example, when three printing devices 3 are used, the web printed by the same printing device 3 depending on which three are used. 7, the path to the folding machine 6 is different.

Thus, the length of the web 7 from the printing device 3 to the folding machine 6 may change depending on the operation pattern. In addition, when the tension related to the web 7 is changed, the extension degree of the web 7 is changed, so that the length of the web 7 from the printing device 3 to the folding machine 6 is changed.
As described above, when the length of the web 7 from the printing apparatus 3 to the folding machine 6 is changed, the cutting position by the folding machine 6 is changed, so that the web 17 cannot be cut at a predetermined position.
The rotary press of the present 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 it, a supporting means, and a position detecting device such as a potentiometer.

  Next, the structure of the paper feeding device 1 will be described in more detail. FIG. 2A to FIG. 2F are schematic views sequentially showing a paper splicing procedure in this method. In this method, a flying paster that performs paper splicing while running the reel is used. In this system, as shown in FIG. 2C, as a means for accelerating the new reel 10B, a detachable motor 12 connected to the shaft end portion of the reel shaft via an accelerating roller 11 is provided. An air brake 13 is also provided as a means for braking the rotation of the old reel 10A and controlling the web feed amount from the old reel 10A by restraining and braking the reel shaft with air pressure. The braking force of the air brake 13 is controlled by an air output from an air conversion device (not shown), and the air conversion device converts a 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 the operating condition such as the winding diameter by feedback control based on the 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 2A that is feeding out the web becomes small, FIG. As shown in (c), the arm 15 supporting the new reel 10B and the old reel 10A is turned to a predetermined paper splicing preparation position, and at the same time, the pacer arm 16 is lowered and is provided rotatably on the pacer arm 16. The paster roller 17 is pressed against the web 7. Further, 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). Control the speed to match the speed.

  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 7 is applied to the new reel 10B by a double-sided tape (described later) tailored to the surface of the new reel 10B. Adhere (pasta). Subsequently, the cutter 18 provided on the paster arm 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 has been 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. 2 (e), the arm 15 is turned to set the new reel 10B at the operating position, and the remaining core of the old reel 10A is replaced with the new reel 10D as shown in FIG. 2 (f). .

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

  The length of the tail length L is set to be shorter than the shortest distance between the driving rollers that convey the web 7 used in the apparatus system. Specifically, the distance between the blanket cylinders 24 of the printing apparatus 3, the printing unit drag roller 25 near the outlet of the printing apparatus 3, the upper drag roller 27 in front of the triangular plate 26 located at the inlet of the folding machine 6, and the folding machine 6 It is set to be shorter than the interval between the nipping rollers 28.

  In the present embodiment, the distance between the blanket cylinder 24 between the printing unit A on the upstream side that performs black printing of the printing apparatus 3a and the printing unit B that performs indigo printing is the shortest (for example, 470 mm), and the tail is larger than this distance. The cutting timing is controlled by the rotary press control device 9 by the cutter 18 so that the length L becomes shorter. More preferably, considering the response speed, the maximum speed, the error, and the distance at which the splicing can be performed reliably, the marginal margin (110 cm) and the distance between the cutter and the brush (218 mm) are 323 mm or more, and the error In consideration of the above, it is preferable that the unit is 460 mm or less, which is slightly shorter than the distance between the blanket cylinders 24 of the printing unit A and the printing unit B.

  As shown in FIG. 4, the rotary press control device 9 controls the cutter 18 so that the tail length L can be changed based on the input parameters such as the tailoring length, the cutter delay time, and the distance between the cutter and the brush. Is possible. These parameters are input by the user, and the tail length L can be appropriately changed.

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. Therefore, in the present embodiment, since the tail length L is shorter than the distance between the blanket cylinders 24 of the printing apparatus 3 and the printing unit B between the shortest driving rollers, the double web 7 is formed on the two blanket cylinders 24. Never straddle at the same time. Needless to say, the two drive rolls (the blanket cylinder, the printing unit drag roller 25, the folding machine drag roller 27, and the nipping roller 28) are not simultaneously straddled.
For this reason, it is possible to prevent the paper feeding force and the paper pulling force from being increased, the physical properties of the paper due to the water absorption amount and the ink amount of the traveling paper being halved, and the backlash from being increased in the drive system. Therefore, stable registration is possible in the printing apparatus 3, and print quality can be improved. In addition, stabilization of the cutting position, stabilization of web conveyance, and the like can be realized.

  The drive 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 a drive roller. Needless to say, the present invention can be applied to a printing press having driving rollers having different configurations.

1 is a schematic diagram illustrating a schematic configuration of a rotary press according to an embodiment of the present invention. It is a figure which shows an example of a paper splicing system, and has shown the paper splicing procedure in order of (a)-(e). It is the perspective view which showed the state of the web spliced. It is a block diagram explaining the cutter control by a rotary press control apparatus. It is a figure which shows the paper seam finishing processing structure of a web roll, Comprising: (a) is a perspective view of the web roll, (b) is sectional drawing by the side view of the web front-end | tip part of the web roll. It is sectional drawing explaining the paper splicing process of a web roll in order of (a)-(c).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper feeder 3 Printing apparatus 9 Rotary press control apparatus (control part)
18 cutters

Claims (4)

In a printing machine provided with a paper feeding device that continuously feeds a web fed from the old reel to the new reel while splicing the web from the old reel to the new reel,
A printing machine, wherein a distance in a length direction of an overlapping portion of the old reel and the new reel spliced by the paper feeding device is shorter than a shortest distance between driving rollers provided 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 in the length direction of the overlapping portion of the old reel and the new reel is shorter than the shortest distance between drive rollers provided in the printing press. The printing machine according to claim 1.   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 a paper splicing method by a paper feeding device that continuously feeds a paper fed from the old reel to the new reel by bonding a web fed from the old reel to the new reel,
After the new reel is bonded to the old reel, a distance of an overlap portion between the old reel and the new reel is provided on a path through which the web passes before the web is finally cut. A paper splicing method using a paper feeding device for cutting the old reel so that the length is shorter than the shortest distance between the drive rollers.

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