JP4011869B2 - Web cutting method for rotary printing press and rotary printing press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a web (sheet-like member) such as printing paper traveling in the longitudinal direction is wound around a paper tube while preventing winding deviation by a pair of side plates, and when the wound web reaches a predetermined amount, the web is The present invention relates to a web cutting method and a rotary printing machine in a rotary printing machine that is cut and continued to wind up a web with another paper tube.
[0002]
[Prior art]
FIG. 5 is a front view of the vicinity of a winding device (rewinder device) in a conventional rotary printing press, and FIG. 6 is a view taken in the direction of arrow K in FIG.
[0003]
As shown in FIG. 5, a large number of rollers 2 for guiding the web 3 are rotatably supported on the frame 1 of the rotary printing press. The paster device 4 is rotatable around a shaft 5 supported by the frame 1 by a driving device (not shown). In the paster device 4, the illustrated position is the standby position.
[0004]
The stand 6a of the winding device 6 rotatably supports the cross-shaped spider arm 7. A paper tube 33 for winding the web 3 is supported at the end of one arm 7 a of the spider arm 7. A roller 9 is rotatably supported at the end of the other arm 7 b of the spider arm 7.
[0005]
As shown in FIG. 6, the paper tube 33 is supported by the cone 11 fixed to the tip of the cone shaft 31. The side plate 10 that prevents the web 3 from being unrolled is fixed to the cone shaft 31 via a boss 32. The cone shaft 31 is rotatably supported by a bearing 30 fixed to the spider arm 7a, and is movable in the left-right direction in the drawing by an air cylinder disposed inside. Moreover, the air cylinder arrange | positioned inside the bearing 30 can be moved to the left-right direction of a figure by rotating the handle | steering-wheel 30a.
[0006]
Next, the paster device 4 will be described with reference to FIGS.
[0007]
FIG. 7 is an enlarged view of the tip of the conventional paster device 4 during paste.
[0008]
A guide roller 13 disposed at the tip of the pair of paster arms 12 is rotatable around a shaft 16 supported by the paster arms 12. A cutter 15 is supported on the other end of the pair of cutter levers 14 whose one ends are fixed to the shaft 16. One end of the cutter air cylinder 17 is rotatable around a shaft 18 fixed to the paster arm 12. The end of the rod of the air cylinder 17 is connected to one end of the lever 20 via a pin 19. The other end of the lever 20 is fixed to the shaft 16. Then, when the air cylinder 17 is operated and the rod is retracted, the cutter 15 rotates with the shaft 16 counterclockwise.
[0009]
The brush 21 is fixed to one end of the holder 23 via a lever 22. The holder 23 is fixed to a shaft 24 that is rotatably supported by the paster frame 12. Three brushes 21 are provided, and the interval between the brushes 21 can be changed according to the width of the web 3. One end of the brush air cylinder 25 is rotatable about a shaft 26 fixed to the paster arm 12. The end of the rod of the air cylinder 25 is connected to one end of a lever 29 via a pin 28. The other end of the lever 29 is fixed to the shaft 24. When the air cylinder 17 is operated and the rod is retracted, the brush 21 rotates counterclockwise together with the shaft 26.
[0010]
The paster frame 12 is configured not to interfere with the side plate 10 even when the interval between the side plates 10 is the largest, that is, when the web 3 having the widest width is wound up. And the roller 13 and the cutter 15 are comprised by the length which can guide and cut | disconnect the widest web 3. FIG.
[0011]
Next, a procedure for replacing the paper tube 33 will be described.
[0012]
FIG. 8 is a diagram showing an operation when the paper tube 33 is replaced in the prior art. In the upper stage A, the paster device 4 is in the standby position, and in the lower stage B, the paster device 4 is in the operating position (when raised). Each case is shown.
[0013]
The paper tube 33 winds the web 3 in a state where tension is applied to the web 3. When the web 3 is wound up to a predetermined length (A in the same figure), the interval between the cones 11 on the other end side of the arm 7a is widened, and a new paper tube 33 (hereinafter referred to as a paper tube 33N) is currently being wound. The paper tube 33 is referred to as the paper tube 33R.) After that, the interval between the cones 11 is narrowed to support the paper tube 33N on the cone 11, and an adhesive double-sided tape is attached to the outer periphery of the paper tube 33N. Next, after the spider arm 7 is rotated 180 degrees counterclockwise, the paster device 4 is positioned at the operating position (B in the figure). As a result, the web 3 travels along a route guided by the rollers 13 and 9. At this time, a gap is formed between the web 3 and the outer periphery of the paper tube 33N.
[0014]
Next, the cone shaft 31, that is, the paper tube 33N is rotated counterclockwise, and when the surface speed of the paper tube 33N becomes equal to or slightly faster than the traveling speed of the web 3, the rod of the air cylinder 25 is drawn. The web 3 is pressed against the surface of the paper tube 33N by the brush 21, and the web 3 is attached to the paper tube 33N via an adhesive tape. Thereafter, the rod of the air cylinder 17 is immediately retracted, and the web 3 is cut by the cutter 15 (see FIG. 7). One of the cut webs 3 (hereinafter referred to as “tail”) is wound around the paper tube 33N and the other is wound around the paper tube 33R. When the paper tube 33N starts to wind up the web 3, the paster device 4 is returned to the standby position. Thereafter, the above operation is repeated until the web 3 is eliminated.
[0015]
As described above, since the conventional rotary printing machine cuts the web 3 outside the side plate 10, when winding the web 3 having a different width, it is only necessary to adjust the position of the brush 21 and improve the work efficiency. I was able to.
[0016]
[Problems to be solved by the invention]
As shown in FIG. 7, when the web 3 is cut outside the side plate 10, the tail length becomes longer. Since the tail portion on the paper tube 33N side is wound around the paper tube 33N together with the subsequent web 3, the web 3 is doubled at the winding start portion. When the web 3 is thick to some extent, no particular problem occurs.
[0017]
However, when the web 3 is a thin film or thin paper having a thickness of about several μm, undulation or the like may occur in the tail portion and unevenness may occur on the surface of the winding start portion. In such a case, since the web 3 to be subsequently wound follows the unevenness of the winding start portion, the wrinkles will not disappear unless a considerable amount of the web 3 is wound even on the web 3 to be subsequently wound. Since the wrinkled web 3 was not a product, the yield was low.
[0018]
The object of the present invention is to solve the above-mentioned problems in the prior art and to prevent wrinkles from occurring at the winding start portion and improve the yield even if the web is a thin film or thin paper having a thickness of about several μm. The present invention provides a method for cutting a web in a rotary printing press and a rotary printing press.
[0019]
[Means for Solving the Problems]
In order to achieve the above object, the first means of the present invention is to wind up the web while preventing the web from slipping by a pair of side plates arranged on both sides of the paper tube, and the winding amount is set to a predetermined amount. reached was the case, the web cutting method in a rotary printing machine so as to continue the winding of the web by other paper tube the web is cut by the cutter, the cutter length is widest web of the cutter When the web is cut by the cutter, the side plate is moved in a direction away from the cutter, and the both ends in the longitudinal direction of the cutter are supported from the outer circumferential side of the web. The web is cut closer to the center than the outer diameter of the side plate.
[0020]
Also, the second means of the present invention is a pair of cones that are rotatably supported and move in the axial direction of the rotation shaft to support the paper tube, and are arranged in the vicinity of the cones to prevent the web from slipping. A plurality of pairs of side plates are provided, and the web is wound around the paper tube while preventing the web from being displaced by the side plates. When the winding amount reaches a predetermined amount, the web is cut. In a rotary printing press in which the web is continuously wound by the other paper tube, the web is arranged in parallel with the longitudinal direction of the web in a state where both ends in the longitudinal direction are supported, and approached from the outer peripheral side of the web. a cutter for cutting the web and, the side plates are moved in the axial direction of the rotary shaft, characterized in that a moving device for positioning in the longitudinal direction of the outside of the cutter.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
1 is a side view of a main part of a winding device in a rotary printing press according to the present invention, FIG. 2 is an enlarged view of the vicinity of a side plate support according to the present invention, and FIG. 3 is a front end of a paster device 4 according to the present invention during paste. FIG. 8 is an enlarged view of a part, and the same or the same function as in FIG. 5 to FIG.
[0022]
In FIG. 2, a spline 41 is formed on the outer periphery of the cone shaft 31. A spline nut 47 is engaged with the spline 41 so as to be movable in the left-right direction in the figure. A ring 48 is fixed to one side of the outer periphery of the spline nut 47. A side plate boss 49 is fixed to the outer periphery of the ring 48. The side plate 10 is fixed to the side surface of the side plate boss 49. Therefore, when the cone shaft 31 rotates, the side plate 10 also rotates. The inner diameter of the side plate 10 is formed larger than the outer diameter of the cone 11.
[0023]
A plate 51 is placed on the other outer periphery of the spline nut 47 via a bearing 50. The bearing 50 is positioned in the thrust direction with respect to the spline nut 47 by a collar, a snap ring, or the like. A rod 52a of an air cylinder 52 is connected to one end of the plate 51 via a joint 53, and a rod 54 for preventing rotation is fixed to the other end. As shown in FIG. 1, the air cylinder 52 is fixed to the outer periphery of the bearing 30. Further, as shown in FIG. 2, the rod 54 is supported by a guide 55 fixed to the outer periphery of the bearing 30 so as to be movable in the horizontal direction.
[0024]
In FIG. 3, the lever 29 is formed in a substantially L shape, and a roller 56 that replaces the brush 21 is disposed at the end opposite to the pin 28 with the shaft 24 interposed therebetween. The material of the roller 56 is rubber, and the length in the axial direction is substantially the same as that of the roller 13. Further, a roller 13 a is disposed on the opposite side of the roller 56 between the scissors roller 13. The roller 13 a is rotatably supported on a shaft 14 a fixed to the paster arm 12.
[0025]
The total length of the paster arm 12 is shorter than the total length of the conventional paster arm 12, and the roller 13a, the roller 56, the roller 13 and the cutter 15 are located closer to the center than the outer diameter of the side plate 10 when the paster device 4 is operated. Be placed.
[0026]
Next, the operation of the present embodiment will be described.
[0027]
FIG. 4 is a diagram showing an operation when the paper tube is exchanged. The upper stage A shows the case where the paster device 4 is in the standby position, and the lower stage B shows the case where the paster device 4 is in the operating position.
[0028]
When the web 3 is wound up to a predetermined length (A in the same figure), the air cylinder 52 on the side where the web 3 is not currently wound is operated, and the rod 52a is pulled in, so that Z shown in FIG. The side plate 10 is moved to the position. Next, the interval between the cones 11 is increased to position the paper tube 33N, and then the interval between the cones 11 is decreased so that the cone 11 supports the paper tube 33N, and an adhesive double-sided tape is attached to the outer periphery of the paper tube 33N. Next, after the spider arm 7 is rotated 180 degrees counterclockwise, the paster device 4 is positioned at the operating position (B in the figure). As a result, the web 3 travels along the path guided by the roller 13a, the roller 56, and the roller 13. At this time, a gap is formed between the outer periphery of the paper tube 33N and the web 3.
[0029]
In this state, the cone shaft 31, that is, the paper tube 33N is rotated counterclockwise, and when the surface speed of the paper tube 33N becomes equal to or slightly faster than the traveling speed of the web 3, the rod of the air cylinder 25 is pulled. . Then, the roller 56 rotates counterclockwise together with the shaft 24, presses the web 3 against the surface of the paper tube 33N, and sticks the web 3 to the paper tube 33N via an adhesive tape. Thereafter, the rod of the air cylinder 17 is immediately pulled, and the web 3 is cut by the cutter 15 (see FIG. 3). One of the tails is wound around the paper tube 33N and the other is wound around the paper tube 33R. When the paper tube 33N starts to wind up the web 3, the paster device 4 is returned to the standby position.
[0030]
Next, the air cylinder 52 is operated to position the side plate 10 at a position Y in FIG. 2 (a position at which the distance from the opposing side plate 10 is slightly wider than the web 3). Thereafter, the above operation is repeated until the web runs out.
[0031]
In this embodiment, instead of the brush 21 in the prior art, the web 3 is pressed by one roller 56 parallel to the paper tube 33, so that the web 3 is attached to the paper tube 33 in the radial direction. It is the same and uniform in the axial direction, and it is possible to prevent the occurrence of wrinkles (press wrinkles) due to variations in pressing.
[0032]
Further, since the web 3 is cut while being supported by the roller 56 and the roller 13 having a short inter-axis distance, the web 3 hardly bends during the cutting. As a result, the cut end of the tail end is substantially straight, and it is possible to prevent unevenness from occurring at the winding start portion.
[0033]
Further, since the side plate 10 is rotated at the same rotation angle as the rotation angle of the paper tube 33 as in the prior art, the end portion of the web 3 can be prevented from being damaged due to interference with the side plate 10.
[0034]
As described above, in the present invention, since the moving device for the side plate 10 is provided and the side plate 10 is moved away from the cone 11, the web 3 can be cut near the paper tube 33. As a result, the tail length is much shorter than in the prior art, and no waviness or the like occurs in the tail, so that no unevenness occurs in the winding start portion. Therefore, the winding start portion of the web 3 is not wrinkled.
[0035]
【The invention's effect】
As described above, in the present invention, since the side plate moving device is provided and the side plate is moved away from the cutter when the web 3 is cut, the web 3 can be cut in the vicinity of the paper tube 33N. it can. As a result, the length of the tail is shortened and wrinkles are not generated at the winding start portion, so that the yield can be improved.
[Brief description of the drawings]
FIG. 1 is a side view of a main part of a winding device in a rotary printing press according to the present invention.
FIG. 2 is an enlarged view of the vicinity of a side plate support according to the present invention.
FIG. 3 is an enlarged view of the tip of the paster device according to the present invention during paste.
FIG. 4 is a diagram showing an operation when replacing a paper tube in the present invention.
FIG. 5 is a front view of the vicinity of a winding device in a conventional rotary printing press.
6 is a view taken in the direction of the arrow K in FIG. 5;
FIG. 7 is an enlarged view of the distal end portion of a paster device during conventional paste.
FIG. 8 is a diagram showing an operation when replacing a paper tube in the prior art.
[Explanation of symbols]
3 Web 10 Side plate 11 Cone 15 Cutter 52 Moving device

Claims (3)

A pair of side plates disposed on both sides of the paper tube take up the web while preventing the web from slipping. When the amount of winding reaches a predetermined amount, the web is cut by a cutter and cut by another paper tube. In the web cutting method in a rotary printing press designed to continue winding the web,
The cutter length of the cutter is set to a length capable of cutting the widest web,
When cutting the web with the cutter, the side plate is moved away from the cutter,
A method for cutting a web in a rotary printing press, wherein the web is cut closer to the center than the outer diameter of the side plate, approaching from the outer peripheral side of the web while supporting both longitudinal ends of the cutter . A plurality of sets of a pair of cones that are rotatably supported and move in the axial direction of the rotation shaft to support the paper tube, and a pair of side plates that are disposed in the vicinity of the cone and prevent the web from being unwound, The web is wound around the paper tube while preventing the web from being unwound by the side plate. When the winding amount reaches a predetermined amount, the web is cut and the web is wound by another paper tube. In a rotary printing press designed to continue
A cutter that is arranged in parallel with the longitudinal direction of the web in a state where both ends in the longitudinal direction are supported, and that cuts the web close to the outer peripheral side of the web;
Said side plates are moved in the axial direction of the rotary shaft, a moving device is positioned outside the longitudinal direction of the cutter,
Rotary printing press, characterized by comprising a.   The rotary printing press according to claim 2, wherein the angular velocity of the side plate and the angular velocity of the paper tube are equal.

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