JP2001260320A - Method and device for fitting flexible printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for fitting a printing plate which enable sure and easy fitting of the flexible printing plate on a plate cylinder and make the elongation of the printing plate 100 μm or less. SOLUTION: On the occasion of fixing the fore end of the flexible printing plate 70 to a plate fore end clamping mechanism 12 provided on the plate cylinder 11 and having upper teeth 12a and lower teeth 12b, notches of the fore end of the printing cylinder 70 are brought into contact with three positioning pins 14 to be positioned and fixed. The device is constituted of a printing plate pressing mechanism 17 which presses the printing plate 70 on the outer peripheral surface of the plate cylinder at positions before and behind the top part 11c of the plate cylinder 11 by a pressing means on the occasion of winding the plate 70 around the cylinder 11 after fixation, a plate tail fixing mechanism 13 which fixes the tail of the printing plate to the plate cylinder on that occasion and a block copy sheet 27 which is wound around and fixed on the plate cylinder and has a plate slippage preventing function. The elongation of the printing plate at the maximum printing length in the direction of rotation of the plate cylinder fitted with the plate is made 100 μm or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting a printing plate on a plate cylinder of a printing apparatus, and more particularly to a printing plate mounting method and a printing plate mounting method for mounting a digitally made flexible printing plate. Related to the device.

[0002]

2. Description of the Related Art In a lithographic printing press, a printing plate is generally wound around a plate cylinder and fixed, and printing is performed in this state. However, a lithographic printing plate (hereinafter referred to as a flexible printing plate) having a support made of a material other than metal (eg, plastic film, paper, etc.) which is inexpensive and easy to handle is dimensionally stable. For example, there is a problem that distortion occurs due to the handling of the printing plate at the time of mounting the printing plate or the frictional force with the blanket cylinder during printing, thereby deteriorating the printing dimension and the printing position accuracy with respect to the paper. Was.

[0003] Therefore, the above-mentioned flexible printing plate has been conventionally limited to the simple printing of a small number of sheets which does not require much registration accuracy of the printed matter, and it is a multicolor and sophisticated high-quality printing or large-sized printing. It was not used for full-scale printing using a printing press.

[0004] Here, the distortion generated in the flexible printing plate during the above-described handling when the printing plate is mounted will be described in detail. 19 and 20 show a typical plate mounting device 60. FIG. 20 is a view taken in the direction of the arrow X in FIG. 19, and FIG. 19 is a sectional view taken along the line YY in FIG.

As shown in FIG. 19, a plate cylinder 61 of a printing press is used.
Cuts a part of a cylinder in the axial direction of the cylinder, and a substantially flat surface (hereinafter, referred to as a flat portion 61a) which is a cut end thereof.
And a groove 65 is provided. In the groove 65, a plate tip clamp mechanism 62 for holding the plate tip, which is the front end of the printing plate 70, and a plate edge clamp mechanism 63, for holding the plate tail which is the rear end of the printing plate 70, are provided. . Each of the clamp mechanisms 62 and 63 is rotatably supported by the lower teeth 62b and 63b, the upper surface of which forms substantially the same plane as the flat surface portion 61a, and the lower teeth, and holds the plate tip between the lower teeth and the upper surface. And possible upper teeth 62a, 63a. Further, the groove 6
5 is provided with a position adjusting mechanism (not shown) that can adjust the position of the plate-end clamping mechanism 62 and the plate-end clamping mechanism 63 in the front-rear, left-right, and diagonal directions.

A top 61c is formed between the flat portion 61a and the curved portion 61b of the plate cylinder 61. Although not shown,
In some plate cylinders, the upper surface of the lower teeth of the clamp mechanism or the like forms a top portion with the curved surface portion instead of the flat surface portion.
Normally, a portion where the plane portion 61a and the curved surface portion 61b intersect is rounded to have a curved surface with a radius of 5 to 30 mm.
Such a portion is also referred to as a top in this specification.

As shown in FIG. 20, positioning pins 64 are projected from the upper surface of the lower teeth 62b of the plate tip clamping mechanism at two places spaced apart in the axial direction of the plate cylinder 61.
The positioning pin 6 of the upper teeth 62a of the printing plate clamp mechanism
A notch 66 is formed at a position corresponding to No. 4. A notch 71 is also formed at a position corresponding to the positioning pin 64 on the printing plate 70a of the printing plate 70 indicated by a two-dot chain line in the drawing.

For example, with the above-described plate mounting device 60,
When the flexible plate 70 is mounted on the plate cylinder 61, the operator presses the plate tip 70a of the plate between the upper teeth 62a and the lower teeth 62b of the plate tip clamping mechanism while holding the plate tail 70b. When the printing plate is brought into contact with the two positioning pins 64, the printing plate 70a may be deformed, and the printing plate 70a may be fixed in the deformed state. In other words, in a plate cylinder capable of mounting a printing plate of a size equal to or greater than the Kikuhan trial, the plate cylinder 61
When the operator presses the flexible printing plate 70 a little too much at the time of mounting the printing plate, the printing plate 70a is pushed in between the two positioning pins 64 in the pushing direction. The plate 70 is deformed so as to protrude from the plate 70. However, if the pressing of the printing plate 70 is insufficient to avoid such deformation, the printing plate cannot be accurately positioned.

As shown in FIG. 19, a top portion 61 formed between a flat portion 61a and a curved portion 61b of the plate cylinder 61 is provided.
In the vicinity of c, the flexible printing plate 70 is hardly adapted to the outer peripheral surface of the plate cylinder 61, and the printing plate 70 tends to float from the outer peripheral surface of the plate cylinder. In order to prevent the printing plate 70 from floating, the operator sets the printing plate tip to the printing plate clamp mechanism 62.
The printing plate 70 is wound by rotating the plate cylinder while strongly pulling the plate edge of the printing plate sandwiched between the plates. However, at this time, the stretched portion of the plate edge of the flexible printing plate 70 extends.

After the printing plate is wound while pulling the printing plate edge as described above, the printing plate edge is pushed between the upper teeth and the lower teeth of the printing plate clamping mechanism, and the upper teeth are rotated to remove the printing plate edge. The plate is fixed and moved by a tension applying mechanism (not shown) in a direction in which tension is applied to the plate, so that the plate is brought into close contact with the peripheral surface of the plate cylinder, and the plate mounting is completed. In a conventional general plate mounting device, the tension applying mechanism for bringing such a plate into close contact with the peripheral surface of the plate cylinder is designed according to a metal support plate of aluminum or the like. In the case of a printing plate of the nature, it grows more than necessary. Further, when the tension applying mechanism is designed to apply a low tension in accordance with the flexible printing plate, the tension is insufficient and the printing plate cannot be brought into close contact with the plate cylinder. Even if the printing plate can be mounted so as not to float, such a low tension will cause the printing plate to shift due to frictional force with the blanket cylinder during printing.

By the way, in recent years, in the lithographic printing method,
Due to recent demands for improved digital drawing technology and more efficient processes, many systems for directly drawing digital image information on a printing plate have been proposed. This is the CTP (C
output-to-plate) or DDP
P (Digital Direct Printing)
Plate). The above technology,
Compared with the conventional conventional plate making method (contact printing with a lithographic film superimposed on a printing plate), the position accuracy of the image on the printing plate is good, and the register accuracy in multicolor printing is good. . Naturally, a digital plate making system using a flexible printing plate has been proposed, and since it is inexpensive, there is a need for multi-color printing using this. However, since the flexible printing plate has the above-described problems, it cannot take advantage of the advantage that the positional accuracy of the image of the digital printing plate is good, and in multicolor printing, the registration accuracy is equivalent to that of the metal support printing plate. Has not been realized.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital plate-making flexible plate which can be easily mounted without being distorted. Another object of the present invention is to provide a printing plate mounting method and a printing plate mounting device which can be implemented by adding the printing plate, and can provide dimensional stability comparable to that of a metal support printing plate and registration accuracy in multicolor printing. .

[0013]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention of a method for mounting a flexible printing plate according to claim 1 of the present application is directed to a flexible printing plate having three or more cutouts at the plate tip. A plate mounting method for mounting the plate on the plate cylinder, wherein a plate clamp mechanism having upper teeth and lower teeth for fixing the plate of the plate to the plate cylinder, and the plate tip facing a notch of the plate. A plate tip positioning and fixing mechanism including at least three positioning pins provided on a clamp mechanism, a plate pressing mechanism for pressing the printing plate against the plate cylinder, and fixing a plate end of the printing plate to the plate cylinder. Using a flexible plate mounting device provided with a plate bottom fixing mechanism and an underlay sheet having a plate misalignment preventing function which is wound and fixed to the plate cylinder, the plate end of the plate is moved to the plate Push between the upper teeth and lower teeth of the tip clamp mechanism and insert the at least three positioning pins into the The inner peripheral surface of the notch is brought into contact with and positioned and fixed, and the printing plate pressing mechanism presses the printing plate all the way to the outer peripheral surface including the top of the plate cylinder by pressing means. The plate cylinder is wound around the plate cylinder by rotating the plate cylinder in a released state, and after the winding is completed, the plate edge of the plate is moved in the radial direction of the plate cylinder by the plate edge fixing mechanism. By pressing and fixing, the elongation of the flexible printing plate at the maximum printing length in the plate cylinder rotation direction when the printing plate is mounted is set to 100 μm or less.
According to a second aspect of the present invention, there is provided a printing plate mounting method for mounting a flexible printing plate having at least three fixing holes formed in the printing plate on a plate cylinder. It has a plate tip clamping mechanism having upper teeth and lower teeth fixed to the plate cylinder, a positioning pin provided in the plate tip clamping mechanism, and at least three fixing pins attached to the positioning pins for fixing the plate. A plate tip positioning and fixing mechanism comprising a pin contact member having higher rigidity than the plate, a plate pressing mechanism for pressing the plate against the plate cylinder, and a plate edge of the plate fixed to the plate cylinder. Using a mounting device for a flexible printing plate having a plate bottom fixing mechanism and an underlay sheet having a plate misalignment preventing function that is wound and fixed to the plate cylinder, the fixing hole of the printing plate is A fixing pin of the pin contact member between upper teeth and lower teeth of the plate tip clamping mechanism The printing plate pressing mechanism rotates the plate cylinder with the plate butt released while the printing plate pressing mechanism presses the printing plate all the way to the outer peripheral surface including the top of the plate cylinder by pressing means. Then, the printing plate is wound around the plate cylinder, and after the winding is completed, the plate edge of the printing plate is pressed and fixed in a radial direction of the plate cylinder by the plate edge fixing mechanism. The elongation of the flexible printing plate at the maximum printing length in the plate cylinder rotation direction at the time of mounting is 1
It is characterized by being not more than 00 μm. Further, according to a third aspect of the present invention, there is provided a printing plate mounting method for mounting a flexible printing plate having at least three fixing holes formed in the printing plate on a plate cylinder. A plate tip positioning and fixing mechanism comprising a plate tip clamping mechanism having upper teeth and lower teeth fixed to the plate cylinder, and positioning pins provided on the plate tip clamping mechanism, and a plate for pressing the plate against the plate cylinder. A pressing mechanism, a plate edge fixing mechanism for fixing the plate edge of the printing plate to the plate cylinder, an underlay sheet having a plate misalignment preventing function wound around and fixed to the plate cylinder, and for fixing the plate to itself. At least 3
And a pin contact member having a higher rigidity than the printing plate having a plurality of fixing pins. First, the fixing pin of the pin contact member is fixed to the fixing hole of the printing plate by using a fixing plate. The plate is positioned and fixed on the plate cylinder by fixing the tip of the pin contact member to the positioning pin between the upper and lower teeth of the plate tip clamping mechanism. Then, while the printing plate pressing mechanism presses the printing plate all over the outer peripheral surface including the top portion of the plate cylinder by pressing means, the plate cylinder is rotated in a state where the plate bottom is released, and the printing plate is pressed by the printing plate. After the winding, the plate edge fixing mechanism presses and fixes the plate edge of the plate in the radial direction of the plate cylinder, so that the plate edge in the plate cylinder rotating direction when the plate is mounted is fixed. The flexible printing plate at the maximum printing length has an elongation of 100 μm or less. To have. According to a fourth aspect of the present invention, in the method for mounting a flexible printing plate according to any one of the first to third aspects, the underplate sheet has a rough surface formed on at least one surface, and the rough surface side has a rough surface. It is characterized in that it is wound and fixed to the plate cylinder so as to be on the front side. Also,
According to a fifth aspect of the present invention, in the method for mounting a flexible printing plate according to any one of the first to third aspects, the underplate sheet has an adhesive surface formed on at least one surface, and the adhesive surface side is a surface side. Characterized in that it is wound and fixed on the plate cylinder so that Further, the invention according to claim 6 is the method for mounting a flexible printing plate according to any one of claims 1 to 5, further comprising a guide member for holding the printing plate, wherein the guide member is provided on the plate cylinder. It is characterized in that the printing plate before and during mounting is held with its plate tail released. Also,
A printing plate mounting apparatus for mounting a flexible printing plate having notches at three or more locations on a printing plate to a plate cylinder according to the invention of claim 7 is provided. And a plate tip clamping mechanism having upper teeth and lower teeth for fixing the plate tip to the plate cylinder, and at least three positioning pins provided on the plate tip clamp mechanism opposite to the notches of the printing plate. A plate pressing mechanism for pressing the printing plate all over the outer peripheral surface including the top of the plate cylinder, a plate edge fixing mechanism for fixing the plate edge of the plate to the plate cylinder, and a winding around the plate cylinder. An underlay sheet having a function of preventing misregistration, which is fixed twice. Further, according to the present invention, in a plate mounting device for mounting a flexible printing plate on a plate cylinder, a plate tip clamp having upper teeth and lower teeth for fixing a plate tip of the plate to the plate cylinder. A printing plate comprising a mechanism, a positioning pin provided on the printing plate clamp mechanism, and a pin contact member attached to the positioning pin and having at least three fixing pins for fixing the printing plate, the pin contact member being more rigid than the printing plate. A positioning and fixing mechanism, a plate pressing mechanism for pressing the printing plate all over the outer peripheral surface including the top of the plate cylinder against the plate cylinder, and a plate edge fixing mechanism for fixing the plate edge of the plate to the plate cylinder And an underlay sheet, which is wound and fixed on the plate cylinder and has a misregistration preventing function, is provided. Further, according to a ninth aspect of the present invention, in a printing plate mounting apparatus for mounting a flexible printing plate on a plate cylinder, a plate tip clamp having upper teeth and lower teeth for fixing a plate tip of the plate to the plate cylinder. A plate tip positioning and fixing mechanism comprising a mechanism and a positioning pin provided in the plate tip clamping mechanism, and a plate pressing mechanism for pressing the printing plate all over the outer peripheral surface including the top of the plate cylinder against the plate cylinder, A plate edge fixing mechanism for fixing the plate edge of the printing plate to the plate cylinder, an underplate sheet having a plate misalignment prevention function wound around and fixed to the plate cylinder, and at least three plates for fixing the plate to itself And a pin contact member having a higher rigidity than the printing plate having the fixing pin described above. According to a tenth aspect of the present invention, in the flexible printing plate mounting apparatus according to any one of the seventh to ninth aspects, the underlay sheet has a rough surface formed on at least one surface, and the rough surface is formed on the rough surface. It is characterized in that it is wound and fixed on the plate cylinder so that the side is the front side. Further, according to an eleventh aspect of the present invention, in the apparatus for mounting a flexible printing plate according to any one of the seventh to ninth aspects, the underplate sheet has an adhesive surface formed on at least one surface, and the adhesive surface is provided. It is characterized in that it is wound and fixed on the plate cylinder so that the side is the front side. According to a twelfth aspect of the present invention, in the flexible printing plate mounting apparatus according to any one of the seventh to eleventh aspects, the flexible printing plate mounting device includes a guide member that holds the printing plate, and the guide member includes The present invention is characterized in that the printing plate before and during mounting on the plate cylinder is held with its plate bottom released. Furthermore, the invention of claim 13 provides the invention of claims 7-1
2. The flexible printing plate mounting device according to claim 1, wherein the plate cylinder is rotated when the printing plate is mounted.
Means for detecting the rotational position of the plate cylinder, means for controlling the rotation and stop of the means for rotating the plate cylinder at a predetermined position by a signal from the means for detecting the rotational position, and the pressing means It is characterized in that it comprises a driving means for moving toward and away from the plate cylinder, and a control means for controlling the driving means at a predetermined position based on a signal from the means for detecting the rotational position.

Here, the maximum printing length in the plate cylinder rotation direction when the printing plate is mounted is the maximum length that can be printed on the paper surface, and specific numerical values are described in the specifications of the printing press and in the instruction manual. Although described, in general, it can be regarded as the length of the area on the diameter circumference of the plate cylinder extending from near the top of the plate tip to near the top of the plate tail. As the pressing means, a roller-shaped pressing member which can be brought into contact with or separated from the plate cylinder by a driving means can be used. Further, a flat pressing means in which a flat pressing member such as a pad or a brush can be brought into contact with and separated from the plate cylinder by a driving means may be used. As the positioning pin, one that protrudes toward the upper teeth on the upper surface of the lower teeth of the plate tip clamping mechanism, one that protrudes toward the lower teeth on the lower surface of the upper teeth, or integrally provided on the plate cylinder Things can be adopted. As the plate edge fixing mechanism, a plate edge clamping mechanism having upper teeth and lower teeth can be adopted. Also,
Plate bottom holding mechanism with leaf spring-like member, double-sided adhesive tape,
Means such as adhesion to the plate body surface or the plate bottom clamping member by spray paste or the like may be used.

According to the first and seventh aspects of the present invention, since the flexible printing plate is positioned by being brought into contact with three or more positioning pins, the interval between the positioning pins on the plate cylinder is reduced. The plate does not deform so that the plate tip protrudes from between the positioning pins. Further, when the printing plate is wound around the plate cylinder, the pressing means presses the entire surface including the top portion, and the printing plate adheres to the plate cylinder outer peripheral surface. There is no need to apply tension to the printing plate.Therefore, the printing plate hardly expands, and even if the expansion due to the resistance of the pressing means during winding is taken into account, the expansion of the printing plate at the maximum printing length is considered. Can be suppressed within 100 μm. Furthermore, since the under sheet having the function of preventing misregistration, which is wound and fixed on the plate cylinder, strongly supports the wound printing plate, usually, when printing plate tension is zero or small, during printing, It is possible to prevent the printing plate from shifting due to the frictional force with the blanket cylinder. Therefore,
The dimensional stability of the printing plate during the mounting and printing of the printing plate is remarkably improved, and the registration accuracy of multicolor printing comparable to that of a metal support printing plate can be obtained. Furthermore, the attachment of the flexible printing plate to the plate cylinder is significantly improved, and the burden on the operator is reduced.

Naturally, it is impossible to suppress the plate elongation at the maximum printing length in the rotation direction of the plate cylinder when mounting a flexible printing plate to 100 μm or less, which is a requirement of the present invention, by the conventional plate mounting method. there were. First, as described above, in order to prevent the printing plate from floating, when the plate cylinder is rotated and wound while strongly pulling the plate bottom of the printing plate, it is easy to perform winding.
Second, since the tension applying mechanism described above is designed for a metal support plate such as an aluminum plate, it can easily be 100 μm in the case of a flexible plate.
This is because it is stretched. Also, the tension applying mechanism
When a low tension is applied so that the elongation becomes 100 μm or less in accordance with a flexible printing plate, the printing plate cannot be brought into close contact with the plate cylinder because the tension is insufficient. Even if the printing plate can be mounted so as not to float, such a low tension will cause the printing plate to shift due to frictional force with the blanket cylinder during printing.

The plate extension of 100 μm or less at the maximum printing length in the plate cylinder rotation direction when the plate is mounted is defined as follows.
A flexible printing plate can be achieved regardless of its material and size (length, width, thickness). This is because, as described above, the mounting method does not actively apply tension to the printing plate.

According to the configuration of the second, third, eighth and ninth aspects, the printing plate tip is protected by a highly rigid pin contact member having at least three fixing pins, and the printing tip is deformed. Is prevented. Therefore, the number of positioning pins does not need to be increased, and the present invention can be relatively easily applied to existing printing apparatuses and plate making apparatuses. As the material of the pin contact member having higher rigidity than the printing plate, a metal or the like can be selected, but is not particularly limited.

According to the constitution of the fourth, fifth, tenth and eleventh aspects, the underlay material supports the printing plate wound on the underlay material with high frictional force or high adhesive force.
Therefore, it is possible to prevent the printing plate from shifting due to the frictional force with the blanket cylinder during printing after the printing plate is mounted on the plate cylinder.

According to the sixth and twelfth aspects of the invention,
By setting the printing plate on the guide means, it is possible to prevent the printing plate from sagging due to the weakness of the flexible printing plate. Therefore, it is not necessary to hold the printing plate by hand, and the printing plate mounting operation is simplified. In addition, this eliminates the need to pull the tail of the plate, which is effective in suppressing the elongation of the printing plate.

According to the configuration of the thirteenth aspect, the operator does not have to perform the rotation / stop of the plate cylinder and the contact / separation of the pressing means from / to the plate cylinder, which are required when the printing plate is mounted. Therefore, the burden on the operator is further reduced, and the printing plate can be quickly mounted on the plate cylinder.

Japanese Patent Application Laid-Open No. 10-24555 discloses a method and an apparatus for positioning and fixing a printing plate tip of a flexible printing plate by using three or more reference pins. Equipment. A reference pin is provided on the upper surface of the upper teeth, and the reference pin is fitted into a reference hole of the printing plate, and is a mechanism for positioning and fixing the printing plate. In the present invention, the reference pin exists between the upper teeth and the lower teeth of the plate tip clamping mechanism,
It is used for contacting a printing plate or a pin contact member, and the printing plate is fixed by using a printing plate clamp mechanism. As described above, the gazette differs from the invention in the device configuration and the function of the reference pin. Further, the gazette discloses that the printing plate is wound while being pressed all over the plate cylinder outer peripheral surface by pressing means. Is not disclosed.

Further, Japanese Utility Model Registration No. 301,242 discloses a plate mounting device provided with a plate pressing roller for pressing a flexible plate onto a plate cylinder. In order to suppress the deformation of the plate, the plate tip is brought into contact with three or more positioning pins, or the plate tip of the plate is fixed to a pin contact member having higher rigidity than the plate, and the pin contact member is positioned. No technical idea of contacting the pin is disclosed. The plate edge clamping mechanism of the plate mounting device disclosed herein has a configuration in which the plate edge is pulled after the plate is clamped, so that tension is not actively applied to the plate of the present invention. No technical idea is disclosed.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings. In addition, about the member already demonstrated, the description is simplified or abbreviate | omitted by attaching | subjecting the same code | symbol in a figure, or an equivalent code | symbol. FIG. 1 is a view showing a first embodiment of the present invention, in which one plate cylinder 11 in a printing apparatus 50 for multicolor printing (four-color printing) is provided with a flexible (polyester) printing plate. FIG. 2 is a diagram showing a plate mounting device 10 for mounting a plate 70. FIG. 2 is a view taken in the direction of the arrow X in FIG. 1 and is a view showing the plate cylinder 11 in the present embodiment.

As shown in FIG. 1, the plate mounting device 10 includes:
A plate cylinder 11 having a plate clamp mechanism 12 and a plate end clamp mechanism 13, a pressing roller 17 and a blanket cylinder 25 which can be brought into contact with and separated from the outer peripheral surface of the plate cylinder 11, and a plate clamp of the printing plate 70 by the plate clamp mechanism 12; And a guide means 20 for guiding the user. Here, the plate cylinder 11 is rotated and stopped by control means (not shown). The control means includes means for detecting the rotational position of the plate cylinder.

The guide means 20 is constituted by providing a guide roller 23 at the tip of an appropriate number (two in this case) of support members 22 projecting from the plate member 21.
Here, a cover that covers the side surface of the printing device 50 is used as the plate-shaped member 21. The blanket cylinder 25 can be brought into contact with and separated from the plate cylinder 11, and when the printing plate 70 is wound around the plate cylinder 11, the printing plate 70 can be pressed between the blanket cylinder and the plate cylinder. The printing plate 70 at the contact point between the plate cylinder 11 and the blanket cylinder 25
A hand cover 26 having a substantially L-shaped cross section is provided on the side (left side in the figure) into which is inserted.
This prevents a finger from being caught between the blanket cylinder 25 and the plate cylinder 11.

As shown in FIG. 3, an underprint material 27 having at least one roughened surface is wound and fixed to the plate cylinder 11 such that the roughened surface is on the front side. Underlay material 27
As the sheet-like substrate used in the present invention, plastics such as polyethylene terephthalate, polypropylene, and polyethylene, or metals such as aluminum and SUS, or paper, synthetic paper, and cloth can be used. Any good one is acceptable.

The pressing roller 17 is, as shown in FIG.
It is assembled to an appropriate driving means such as a cylinder 18 and can be brought into contact with and separated from the outer peripheral surface of the plate cylinder 11 by control means (not shown). Here, the pressing roller 17 is preferably made of a material having elasticity such as rubber so as not to damage the flexible printing plate.

As shown in FIG. 2, three or more (here, seven) positioning pins are provided on the upper surface of the lower teeth 12b of the plate tip clamping mechanism at predetermined intervals in the axial direction of the plate cylinder 11. 14 are protruded. Here, among the positioning pins 14, only one of the positioning pins on the right side in the drawing has a circular cross section, and the other positioning pins have the same width as the positioning pin in the plate cylinder axis direction. The cross section is formed in such a manner that both sides of the circle are cut in a direction perpendicular to the plate cylinder axis direction so as to be narrower than the width of the pin in the plate cylinder axis direction. Also, corresponding to the position of the positioning pin 14,
Notches 16 and 71 are formed at appropriate positions of the upper teeth 12a and at appropriate positions of the printing plate tip 70a, respectively.

In mounting the printing plate 70 on the plate cylinder 11, the operator first sets the printing plate 70 on the guide means 20, and places the printing plate 70 in the gap between the upper teeth 12a and the lower teeth 12b of the plate tip clamping mechanism. Printing plate 7 so that plate tip 70a is inserted
0 is pushed into the positioning pin 14 shown in FIG.
The inner peripheral surface of the notch 71 of 0a is abutted to position the printing tip 70a. In this state, the upper teeth 12a are closed, and
Is fixed.

Next, in the state shown in FIG. 1, the plate cylinder 11 is rotated counterclockwise by control means (not shown), and the printing plate 70 is wound around the plate cylinder 11. The plate cylinder 11 is rotated, and the control means controls the pressing roller 17 to move the plate cylinder 11 to the flat portion 1 of the plate cylinder.
The control means stops the rotation of the plate cylinder 11 when detecting the rotational position of the plate cylinder that can be brought into contact with 1a.

Then, as shown in FIG.
7 is brought into contact with the plane portion 11a of the plate cylinder, and the printing plate 70 is
1 against the outer surface. Then, the plate cylinder 11 is again rotated in the counterclockwise direction by the control means (not shown). By doing so, the printing plate 70 can be pressed against the plate cylinder outer peripheral surface by the pressing roller 17 before and after the top 11c of the plate cylinder. At this time, the pressing roller 17 urged toward the outer peripheral surface of the plate cylinder by the cylinder 18 moves forward and backward in accordance with the shape of the outer peripheral surface of the plate cylinder.

The plate cylinder 11 is rotated, and as shown in FIG. 6, when the printing plate is wound up to the vicinity of the plate edge clamping mechanism 13, a control means (not shown) controls the rotation of the plate cylinder 11. Stop.

At this point, as shown in FIG. 7, the operator bends the vicinity of the plate edge of the printing plate and inserts the plate edge 70b into the gap between the upper teeth 13a and the lower teeth 13b of the plate edge clamping mechanism. At this time, the plate butt 70b is placed on the flat portion 11a of the plate cylinder 11.
And rise from the upper surface of the lower teeth 13b. Then, the plate cylinder 11 is again rotated in the counterclockwise direction by the control means (not shown). In this way, the printing plate can be pressed against the outer peripheral surface of the plate cylinder by the pressing roller 17 before and after the top of the plate cylinder, and as shown in FIG. Can be in close contact. Finally, after closing the upper edge 13a of the plate edge clamp mechanism to fix the plate edge, the pressing roller 17 is retracted from the plate 70 by a control means (not shown), so that the plate roller 11 is moved to the plate cylinder 11 of the flexible plate. Is completed.

In the printing plate mounting apparatus 10 having the above-described configuration, the printing plate 70a of the flexible printing plate 70 is provided with seven positioning pins 1 protruding from the lower teeth 12b of the printing plate clamp mechanism.
4 and is positioned. Therefore, the interval between the positioning pins on the plate cylinder is narrower than that of the conventional one, so that even for a large-size printing plate such as a chrysanthemum half trial, the printing plate 70a protrudes from between the positioning pins 14. ,
The plate will not be deformed.

In the printing plate mounting apparatus 10, the pressing roller 17 moves the printing plate between the top and the bottom of the plate outer peripheral surface (the top on the plate tip clamping mechanism 12 side and the top on the plate edge clamping mechanism 13 side) 11c. The printing plate 70 wound around the plate cylinder 11 does not float from the plate cylinder outer peripheral surface. Therefore, since the operator does not have to strongly pull the plate edge 70b in order to eliminate the lifting of the plate 70, the plate edge 70b of the flexible printing plate does not undergo deformation such as elongation. Further, the burden on the operator in mounting the flexible printing plate is reduced.

In the present embodiment, when fixing the plate edge 70b to the plate edge clamp mechanism 13, the operator bends the vicinity of the plate edge of the printing plate, and moves the plate edge 70b to the upper teeth 13a of the plate edge clamp mechanism. Since it is inserted between the lower teeth 13b, the plate edge clamping mechanism 13 does not need to have a structure that can open the upper teeth 13a widely. Therefore, the structure can be simplified.

Further, since the cover of the printing device 50 is used as the plate member 21 of the guide means 20, the cost and size of the device can be reduced. The width of one of the positioning pins 14 in the plate cylinder axis direction is set to be wider than the width of the other positioning pins in the plate cylinder axis direction. Therefore, the inner peripheral surface of the notch 71 of the printing plate can be easily brought into contact with the positioning pin 14.
Further, the printing plate 70 can be accurately positioned by one positioning pin having a large width in the plate cylinder axial direction.

Further, the plate cylinder 11 is automatically rotated by the control means and stopped at a predetermined position, and the pressing roller 17 is also automatically rotated at a predetermined position by the control means.
, The burden on the operator is further reduced.
The underprint material 27 having at least one roughened surface is wound around the plate cylinder 11 such that the roughened surface is on the front side. Therefore, deformation and displacement of the printing plate after the printing plate 70 comes into contact with the outer peripheral surface of the plate cylinder can be reliably prevented. In the present embodiment, the pressing roller 17 is connected to the plate cylinder 1.
The rotation of the plate cylinder 11 is stopped when the plate cylinder 11 is moved toward and away from the plate cylinder 1, for example.
The pressing roller 17 may be moved toward and away from the plate cylinder 11 without stopping the plate 1.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the plate mounting apparatus of this embodiment, the conventional plate cylinder 61 shown in FIGS. 19 and 20 is used as the plate cylinder. Then, the underlaying material 27 (see FIG. 3) having at least one surface formed into a rough surface, which is used in the above-described first embodiment, is fixedly wound around the plate cylinder 61 such that the rough surface is on the front surface side. . The present embodiment has a configuration similar to that of the plate mounting apparatus 10 of the first embodiment (see FIG. 1) except for the plate cylinder.

FIG. 9 shows a flexible printing plate 80 used in the present embodiment and the pin contact member 30 fixed to the plate end of the printing plate 80. In the plate tip of the printing plate 80, a notch 81 whose peripheral edge is substantially U-shaped is formed at a position corresponding to the two positioning pins 64 shown in FIG. At least three (here, seven) fixing holes 82 are formed in the plate tip at appropriate intervals in the width direction of the printing plate 80 (in the horizontal direction in FIG. 9). The pin contact member 30 includes a band-shaped substrate 31 made of a highly rigid material such as a metal and having a length equal to or longer than the width of the printing plate 80. The substrate 31 is provided with circular fitting holes 33 at locations corresponding to the two positioning pins 64 shown in FIG. The substrate 31 has
At least three (here, seven) fixing pins 32 are protrudingly provided at appropriate intervals in the longitudinal direction of the substrate.

FIG. 10A shows a notch 81 of the printing plate when the pin contact member 30 shown in FIG.
The enlarged view of the vicinity is shown. FIG. 10B is a cross-sectional view taken along the line YY in FIG. As shown in FIG.
The fixing pin 3 of the pin contact member 30 is inserted into the fixing hole 82 of the printing plate 80.
By inserting 2, the pin contact member 30 is fixed to the printing plate 80. At this time, the circular fitting hole 33 of the pin contact member
Of the notch 81 of the plate 80 is set to coincide with the curved portion of the substantially U-shaped periphery.

When the plate 80 is mounted on the plate cylinder 61 shown in FIG. 20, the plate tip of the plate 80 is fixed to the pin contact member 30 and then the plate tip is attached to the plate clamp mechanism 62. The plate tip of the printing plate 80 may be fixed to the pin contact member 30 while the positioning pin 64 of the plate tip clamp mechanism 62 is fitted into the fitting hole 33 of the pin contact member 30. Is also good. FIG.
When the positioning pin 64 of the plate cylinder is inserted into the insertion hole 33 of the pin contact member as shown by a dashed line in FIG. 0 (B), the inner peripheral surface of the notch 81 of the plate comes into contact with the pin. It contacts the positioning pin 64 together with the inner peripheral surface of the insertion hole 33 of the member. The operation of winding the printing plate 80 around the plate cylinder 61 is performed in the same manner as in the first embodiment.

In the printing plate mounting apparatus having the above-described configuration, when the printing plate of the flexible printing plate 80 is positioned and fixed by the printing plate clamp mechanism, the printing plate is provided with a highly rigid pin contact. The printing plate is protected by the contact member 30 and deformation of the printing plate is prevented. Therefore, by using the pin contact member 30, the plate can be prevented from being deformed without increasing the number of positioning pins, and the plate cylinder 61 of the existing printing apparatus can be used. If this embodiment is implemented using existing equipment, equipment costs can be significantly reduced.

Next, a third embodiment of the present invention will be described with reference to FIGS. This embodiment is a modification of the above-described second embodiment in which the pin contact member 30 is modified, and the other configuration is the same as that of the second embodiment.

FIG. 11 shows the configuration used in this embodiment.
FIG. 2 shows a flexible printing plate 80 and a pin contact member 40 fixed to a plate tip of the printing plate 80. FIG. The pin contact member 40 includes a substrate 41 made of a highly rigid material such as a metal and having a length equal to or longer than the width of the printing plate 80. The substrate 41 is provided with cutouts 43 whose peripheral edges are substantially U-shaped at locations corresponding to the two positioning pins 64 of the plate cylinder 61 shown in FIG. Also, at least three (here, seven) fixing pins 42 are provided on the substrate 41 at appropriate intervals in the longitudinal direction of the substrate.
Is protruding.

FIG. 12 is an enlarged view of the vicinity of the notch 81 of the printing plate when the pin contact member 40 is fixed to the plate tip of the printing plate 80. As shown in the drawing, the fixing pin 42 of the pin contact member 40 is inserted into the fixing hole 82 of the printing plate 80 to
The pin abutment member 40 is fixed to the second member. At this time, the periphery of the notch 43 of the pin contact member 40 is set so as to coincide with the periphery of the notch 81 of the printing plate 80.

According to the plate cylinder mounting device having the above-described configuration, when the pin contact member 40 is fixed to the plate tip of the printing plate 80 and then the plate tip is fixed to the plate tip clamping mechanism, Since the contact member 40 can be inserted between the upper teeth and the lower teeth of the plate tip clamping mechanism to position the pin contact member 40 and the plate 80, the plate tip can be positioned and fixed more easily. Simplified.

FIG. 13 shows a fourth embodiment of the present invention.
In the plate mounting device 90 of the present embodiment, the plate cylinder 91
The upper teeth 93a of the plate edge clamping mechanism 93 can be largely separated from the upper surfaces of the lower teeth 93b, that is, the upper teeth 93a can be made not to cover the upper surfaces of the lower teeth 93b. Here, the upper teeth 93a can be rotated until the angle formed between the lower surface of the upper teeth 93a and the upper surface of the lower teeth 93b is equal to or larger than the angle at which the plate edge and the clamp surface of the upper teeth 93a do not contact in the state shown in FIG. Has become.

In this case, an underlay material having at least one surface formed on an adhesive surface is wound and fixed on the plate cylinder 91 such that the adhesive surface is on the front surface side. The adhesive surface can be formed, for example, by spraying a sheet adhesive on a sheet-like substrate, applying a double-sided tape, or applying an adhesive material.

At the time of mounting the printing plate, the printing plate is fixed by the printing plate clamp mechanism 92 and the printing plate is wound around the outer peripheral surface of the plate cylinder 91 in the same procedure as in the first embodiment. And
As shown in FIG. 13, when the printing plate is wound up to the vicinity of the plate edge clamp mechanism 93, the upper teeth 93a of the plate edge clamp mechanism 93 are widely opened so that the upper teeth 93a do not cover the upper surface of the lower teeth 93b. State.

Then, as shown in FIG. 13, the press roller 17 is brought into contact with the curved surface of the plate cylinder 91 to press the printing plate against the outer peripheral surface of the plate cylinder, while rotating the plate cylinder 91 in the counterclockwise direction. By doing so, the printing plate can be pressed against the outer peripheral surface of the plate cylinder before and after the top portion 91c of the plate cylinder by the pressing roller 17, and the plate tail 70b is brought into close contact with the flat surface portion 91a of the plate cylinder and the upper surface of the lower teeth 93b. be able to. Finally, the upper teeth 93a of the plate edge clamp mechanism are closed and the plate edge 70b is closed.
After fixing, the pressing roller 17 is retracted from the printing plate, whereby the mounting of the flexible printing plate on the plate cylinder 91 is completed.

In the plate mounting device 90 having the above-described configuration, the plate edge 70b of the plate does not have to be curved and inserted between the upper teeth 93a and the lower teeth 93b of the plate edge clamping mechanism 93. The plate mounting operation is further simplified, and is suitable for automation.

FIG. 14 shows a fifth embodiment of the present invention.
In the plate mounting device 100 of the present embodiment, the plate cylinder 10
A flat pressing means is used as a pressing means for pressing the printing plate 70 against the outer peripheral surface of the plate cylinder at least before and after the top of the plate 1. Here, the plane pressing means is configured such that the brush 117 whose tips are substantially aligned so as to form one plane can be driven by the air cylinder 18 to contact and separate from the plate cylinder 101. Brushes made of synthetic fibers such as nylon, polypropylene, vinyl chloride, PBT, and aramid, plant fibers (palm), or animal fibers (pig hair, horse hair, goat hair, etc.) can be used.

The work of winding the printing plate 70 around the plate cylinder 101 is as follows.
This is performed in the same manner as in the first embodiment. However, in the present embodiment, the printing plate 70 can be pressed against the outer peripheral surface of the plate cylinder 101 over a wide area by the plane pressing means.
The timing accuracy of stopping 01 may be low.

In the printing plate mounting apparatus 100 having the above-described configuration, the printing plate 70 can be pressed against the outer peripheral surface of the plate cylinder 101 by a flat pressing means over a wide area. The floating of the plate can be reliably and easily prevented. For example, the printing plate can be mounted while rotating and stopping the plate cylinder manually. In addition,
In the present embodiment, the brush tips are configured to form one plane, but if the printing plate is securely pressed against the plate cylinder outer peripheral surface, the brush tips may be aligned to form a plurality of planes. For example, the brush tips may be aligned such that the brush tip face becomes V-shaped or the like in a sectional view.

In this embodiment, the brush is used as the plane pressing means, but a pad made of a sponge (urethane sponge, cellulose sponge, etc.), felt or the like may be used instead of the brush. It is also possible to use a pad having a structure in which a core material such as sponge, felt, rubber or the like is covered with molton (cloth).

Next, a sixth embodiment of the present invention will be described with reference to FIGS. FIG. 15 shows a partially enlarged view of the plate cylinder 111 in the present embodiment. In a groove 115 provided in the plate cylinder 111, a plate tip clamping mechanism 112 is provided.
And a plate edge clamp mechanism 113 are provided. The lower teeth 112b of the plate tip clamp mechanism 112 are provided with rectangular cutouts in plan view at predetermined intervals in the axial direction of the plate cylinder 111, and are provided integrally with the plate cylinder 111 in the cutouts. The pin block 119 is arranged. A positioning pin 114 is provided on the pin block 119 so as to project therefrom. As shown in FIG. 16 which is a cross-sectional view taken along the line YY in FIG.
5 is in close contact with the side surface.

In the plate mounting apparatus having the above-described configuration, the positioning pin 114 is connected to the plate cylinder 1 via the pin block.
11 are provided integrally. Therefore, more accurate positioning of the printing plate tip can be achieved.

Next, a seventh embodiment of the present invention will be described with reference to FIGS. FIG. 17 shows a partially enlarged view of the plate cylinder 121 in the present embodiment. In the groove 115 provided in the plate cylinder 111, a plate tip clamping mechanism 122 is provided.
And a plate edge clamp mechanism 123 are provided. Each of the clamp mechanisms 122 and 123 has a plate-shaped upper tooth 122a, 12
3a. In the present embodiment, the upper teeth 122
a and 123 a are fixed in the groove 125. The positioning pins 1 are provided on the lower surface of the upper teeth 122a of the plate tip clamping mechanism 122 at predetermined intervals in the axial direction of the plate cylinder.
24 are protruded.

FIG. 18 is a sectional view taken along line YY in FIG. Positioning pins 12 hanging from upper teeth 122a are provided above lower teeth 122b disposed on the bottom surface of groove 125.
Axial cam member 13 having a reduced diameter at a location corresponding to 4
0 is provided. Then, the cam member 130 and the upper teeth 1
A leaf spring 131 is disposed between the leaf spring 131 and the plate 22a. By rotating the cam member 130, the upper teeth 122a and the leaf spring 1
31 can be opened and closed, and the printing plate 70 can be pinched. That is, in the present embodiment, the leaf spring 131 substantially functions as a lower tooth that sandwiches the printing tip with the upper tooth 122a.

In the plate mounting apparatus having the above-described configuration, the positioning pin 124 is provided on the upper teeth 122a so as to extend toward the lower teeth 122b.
a is not movable. Therefore, the pressing roller is moved to the upper tooth 1
The printing plate 70 can be brought into close contact with the plate cylinder 121 more reliably.

It should be noted that the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.

[0064]

As described above, in particular, according to the mounting method and the apparatus according to the present invention for the digital printing plate, the dimensional stability in mounting and printing the plate is remarkably improved, and the metal support is provided. Multi-color printing register accuracy equivalent to that of a printing plate can be obtained. Further, the mountability of the flexible printing plate to the plate cylinder is significantly improved, and the burden on the operator is reduced. further,
It can be implemented by making some improvements to existing printing machines and the like, and equipment costs can be saved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a view as viewed from an arrow X in FIG.

FIG. 3 is a view showing an underlay material wound around a plate cylinder in the first embodiment.

FIG. 4 is a diagram illustrating a pressing roller according to the first embodiment.

FIG. 5 is a diagram showing mounting of a printing plate according to the first embodiment.

FIG. 6 is a view showing mounting of a printing plate according to the first embodiment.

FIG. 7 is a diagram showing mounting of a printing plate according to the first embodiment.

FIG. 8 is a view showing mounting of a printing plate according to the first embodiment.

FIG. 9 is a diagram illustrating a printing plate and a pin contact member according to a second embodiment of the present invention.

FIG. 10 is a view showing a state in which the pin contact member in FIG. 9 is fixed to a printing plate.

FIG. 11 is a diagram illustrating a printing plate and a pin contact member according to a third embodiment of the present invention.

FIG. 12 is a view showing a state where the pin contact member in FIG. 11 is fixed to a printing plate.

FIG. 13 is a diagram showing a fourth embodiment of the present invention.

FIG. 14 is a diagram showing a fifth embodiment of the present invention.

FIG. 15 is a partially enlarged view of a plate cylinder according to a sixth embodiment of the present invention.

16 is a sectional view taken along line YY in FIG.

FIG. 17 is a partially enlarged view of a plate cylinder according to a seventh embodiment of the present invention.

18 is a sectional view taken along line YY in FIG.

FIG. 19 is a view showing a conventional plate mounting device.

20 is a view as viewed in the direction of the arrow X in FIG. 19;

[Explanation of symbols]

10, 90, 100 Plate mounting device 11, 91, 101, 111, 121 Plate cylinder 11c, 91c, 101c Top 12, 92, 102 Plate tip clamp mechanism 13, 93, 103 Plate tail clamp mechanism 12a, 13a, 92a, 93a, 112a, 113
a, 122a, 123a Upper teeth 12b, 13b, 92b, 93b, 112b, 113
b, 122b Lower tooth 14, 114, 124 Positioning pin 17 Pressing roller (pressing means) 20 Guide means 25 Blanket cylinder 27 Underlay material 30, 40 Pin contact member 70, 80 Flexible plate (Flexible plate) Plate) 117 brush (flat pressing member)

Claims (13)

[Claims] 1. A printing plate mounting method for mounting, on a plate cylinder, a flexible printing plate having notches at three or more locations on a plate tip, wherein upper and lower teeth for fixing the plate tip of the plate to the plate cylinder are provided. A plate tip positioning and fixing mechanism comprising: a plate tip clamp mechanism having teeth; at least three positioning pins provided on the plate tip clamp mechanism facing the notch of the printing plate; A plate pressing mechanism for pressing the printing plate, a plate bottom fixing mechanism for fixing the plate bottom of the printing plate to the plate cylinder, and an under-sheet having a plate misalignment prevention function wound around and fixed to the plate cylinder. Using a flexible printing plate mounting device, press the printing plate tip of the printing plate between upper teeth and lower teeth of the printing plate clamp mechanism, and insert the notch of the printing plate into at least three positioning pins. The inner peripheral surface is abutted to perform positioning and fixation. While pressing the printing plate all over the outer peripheral surface including the top of the plate cylinder by pressing means, the plate cylinder is rotated while the plate bottom is released, and the printing plate is wound around the plate cylinder. After the printing is completed, the plate edge of the printing plate is pressed and fixed in the radial direction of the plate cylinder by the plate edge fixing mechanism, whereby the flexible printing plate at the maximum printing length in the plate cylinder rotating direction when the plate is mounted is mounted. A method for mounting a flexible printing plate, wherein the elongation of the plate is 100 μm or less. 2. A printing plate mounting method for mounting, on a plate cylinder, a flexible printing plate having at least three fixing holes formed in the plate tip, wherein the plate tip of the printing plate is fixed to the plate cylinder. Plate clamp mechanism having upper teeth and lower teeth, a positioning pin provided in the plate clamp mechanism, and at least three fixing pins attached to the positioning pin for fixing the plate to itself. A plate tip positioning and fixing mechanism comprising a pin contact member having higher rigidity, a plate pressing mechanism for pressing the printing plate against the plate cylinder, and a plate tail for fixing the plate tail of the plate to the plate cylinder. Using a mounting device for a flexible printing plate having a fixing mechanism, and an underlay sheet having a function of preventing misregistration wound around and fixed to the plate cylinder, the fixing hole of the printing plate is fixed to the plate. Insert the fixing pin of the pin contact member between the upper and lower teeth of the tip clamp mechanism. The printing plate pressing mechanism rotates the printing plate cylinder with the printing plate butt released while the printing plate pressing mechanism presses the printing plate all the way to the outer peripheral surface including the top of the printing plate cylinder by pressing means. Then, the printing plate is wound around the plate cylinder, and after the winding is completed, the plate edge of the printing plate is pressed and fixed in a radial direction of the plate cylinder by the plate edge fixing mechanism. A method for mounting a flexible printing plate, wherein the elongation of the flexible printing plate at the maximum printing length in the plate cylinder rotation direction at the time of mounting is 100 μm or less. 3. A printing plate mounting method for mounting, on a plate cylinder, a flexible printing plate having at least three fixing holes formed in the plate tip, wherein the plate tip of the printing plate is fixed to the plate cylinder. A plate tip clamping mechanism having upper teeth and lower teeth, a positioning pin provided on the plate tip clamping mechanism, a plate tip positioning and fixing mechanism, and a plate pressing mechanism for pressing the printing plate against the plate cylinder. A plate edge fixing mechanism for fixing the plate edge of the printing plate to the plate cylinder; an underlay sheet having a function of preventing misregistration wound around the plate cylinder; and at least three plates for fixing the plate to itself. And a pin contact member having a higher rigidity than the printing plate having a plurality of fixing pins. First, the fixing pin of the pin contact member is fixed to a fixing hole of the plate. Then, fix the tip of the pin contact member on the plate tip clamping mechanism. The plate is positioned and fixed on the plate cylinder by fixing the plate to the plate pin between the lower plate and the lower teeth, and the plate pressing mechanism presses the plate on an outer peripheral surface including a top portion of the plate cylinder. The printing plate is wound around the plate cylinder by rotating the plate cylinder with the printing plate bottom released while pressing the printing plate all over, and after the winding is completed, the printing plate plate is fixed by the printing plate bottom fixing mechanism. By flexing and fixing the buttocks in the radial direction of the plate cylinder, the extension of the flexible printing plate at the maximum printing length in the plate cylinder rotation direction when the plate is mounted is set to 100 μm or less. How to attach the printing plate. 4. The underprint sheet according to claim 1, wherein a rough surface is formed on at least one surface, and the undersurface sheet is wound and fixed on the plate cylinder such that the rough surface side is the front surface side. A method for mounting a flexible printing plate according to any one of the preceding claims. 5. The underprint sheet has an adhesive surface formed on at least one surface thereof, and is fixedly wound around the plate cylinder such that the adhesive surface side is the front surface side.
The method for mounting a flexible printing plate according to any one of the preceding claims. 6. A guide member for holding the printing plate,
The mounting of a flexible printing plate according to any one of claims 1 to 5, wherein the guide member holds the printing plate before and during mounting on the plate cylinder in a state where the plate bottom is released. Method. 7. A printing plate mounting apparatus for mounting a flexible printing plate having notches at three or more places on a printing plate at a plate cylinder, wherein upper and lower teeth for fixing the printing plate tip to the plate cylinder are provided. A plate tip positioning and fixing mechanism comprising: a plate tip clamp mechanism having teeth; at least three positioning pins provided on the plate tip clamp mechanism facing the notch of the printing plate; A plate pressing mechanism that presses all over the outer peripheral surface including the top of the plate, a plate tail fixing mechanism that fixes the plate tail of the printing plate to the plate cylinder, and a plate misalignment prevention function that is wound and fixed to the plate cylinder. And an underlay sheet having: a flexible printing plate mounting device. 8. A printing plate mounting device for mounting a flexible printing plate on a plate cylinder, comprising: a plate tip clamping mechanism having upper teeth and lower teeth for fixing a plate tip of the printing plate to the plate cylinder; A plate-tip positioning and fixing device comprising: a positioning pin provided on a tip clamping mechanism; and a pin contact member, which is attached to the positioning pin and has at least three fixing pins for fixing the printing plate itself, having higher rigidity than the printing plate. A mechanism, a plate pressing mechanism for pressing the printing plate against the plate cylinder all over the outer peripheral surface including the top of the plate cylinder, a plate edge fixing mechanism for fixing the plate edge of the plate to the plate cylinder, An under sheet having a function of preventing misregistration wound around the plate cylinder and having a function of preventing misregistration. 9. A printing plate mounting device for mounting a flexible printing plate on a plate cylinder, comprising: a plate tip clamping mechanism having upper teeth and lower teeth for fixing a plate tip of the printing plate to the plate cylinder; A plate positioning and fixing mechanism comprising a positioning pin provided in a tip clamping mechanism; a plate pressing mechanism for pressing the printing plate against the outer peripheral surface including the top of the plate cylinder on the plate cylinder; and the plate. A plate bottom fixing mechanism for fixing the plate bottom of the plate to the plate cylinder; an underlay sheet having a plate misalignment preventing function wound around and fixed to the plate cylinder; and at least three fixing pins for fixing the printing plate to itself. And a pin abutting member having higher rigidity than the printing plate. 10. The underprint sheet according to claim 7, wherein a rough surface is formed on at least one surface, and the undersurface sheet is wound and fixed on the plate cylinder such that the rough surface side is the front surface side. A mounting device for a flexible printing plate according to any one of the preceding claims. 11. The underprint sheet has an adhesive surface formed on at least one surface, and is wound and fixed to the plate cylinder such that the adhesive surface side is the front surface side.
10. The mounting device for a flexible printing plate according to claim 9. 12. The printing apparatus according to claim 1, further comprising a guide member for holding the printing plate, wherein the guide member holds the printing plate before and during mounting on the plate cylinder in a state where the plate bottom is released. Item 12. An apparatus for mounting a flexible printing plate according to any one of Items 7 to 11. 13. A means for rotating the plate cylinder when the printing plate is mounted; a means for detecting a rotational position of the plate cylinder; and a means for detecting the rotational position of the plate at a predetermined position by a signal from the means for detecting the rotational position. Means for controlling rotation and stop of means for rotating the cylinder, driving means for bringing the pressing means into and out of contact with the plate cylinder, and driving at a predetermined position by a signal from means for detecting the rotational position The flexible printing plate mounting device according to any one of claims 7 to 12, further comprising control means for controlling the means.