JP3341950B2 - Clamping device and printing plate mounting method for printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping device for a printing press and a method of mounting a printing plate, and more particularly to a printing plate having a low rigidity or strength, such as a paper plate or a film plate having a plastic film as a support. The present invention relates to a clamp device and a mounting method for mounting on a torso.

[0002]

2. Description of the Related Art As a printing plate, there are a PS plate using an aluminum plate, a paper plate using paper, a film plate using a plastic film, and the like, which are used properly according to the purpose of printing. The PS plate can print nearly ten times the number of printed sheets as compared with the paper plate, but is expensive, and in recent years, the paper plate and the film plate are widely used in the field of light printing with a small number of print copies.

In recent years, there has been an increasing demand for multi-color printing such as color printing on a paper plate or a film plate, and this has been dealt with. As is well known, in multi-color printing, precise positioning of the printing plate is important, and the method of attaching the printing plate to a clamping device like a PS plate and mounting it directly on the plate cylinder is difficult, as with a paper plate or a film plate. Plates with low strength and weakness have problems such as easy wrinkling during position adjustment.

Therefore, in order to solve this problem, a paper plate or film plate is not mounted directly on the plate cylinder, but a plate cylinder tailor such as a PS plate is mounted in advance, and the paper plate or film plate is mounted thereon. A method has been used in which the plate can be adjusted by mounting and moving the plate cylinder tailoring.

As this method, there is known a method of providing a plate mounting plate, a plate positioning pin, and a plate holding plate on an upper blade of a holding side clamping device on which a plate cylinder tailoring is mounted. 175819, 3-
This is disclosed in detail in Japanese Patent Publication No. 19037.

FIG. 7 is a partial cross-sectional view of a plate cylinder of a printing press according to Japanese Utility Model Laid-Open Publication Nos. 1-175819 and 3-19037, and its main structure is almost the same as that of the present invention. In the notch of the plate cylinder 7, a clamping device 31 on the side of the plate is provided.
In addition, a rear-side clamp device 32 is housed, and the clamp device mainly includes upper blades 3 and 23, lower blades 4 and 24, and cams 5 and 25, respectively. The upper blade has a mechanism that opens and closes by rotating a cam.

As described above, since the printing plate 1 having a low rigidity and strength, such as a paper plate or a film plate, cannot be directly mounted on the plate cylinder 7, the plate cylinder tailoring 6 made of a PS plate or the like in advance is used. The plate 1 is attached to the plate cylinder 7 by holding it on both the clamping devices 31 and 32 on the holding side and the bottom side, and the printing plate 1 such as a paper plate or a film plate is pasted thereon with glue or double-sided adhesive tape. It was mounted on the plate cylinder 7 via the tailoring 6.

At this time, in the above-mentioned publication, the pin hole 1C of the printing plate 1 is inserted into the positioning pin 2 provided to be fixed to the upper surface of the upper blade 3 of the gripping clamp device as a printing plate positioning reference. It was inserted and attached to the plate body tailoring 6.

However, in these methods, while the attachment and detachment of the upper blade and the lower blade of the clamping device are repeated due to replacement of the plate cylinder tailoring, a displacement occurs in the upper blade of the clamping device, and as a result, the upper blade is provided on the upper blade of the clamping device. There is a problem that the positioning pin is shifted.

[0010] Therefore, in the conventional plate mounting device using the plate cylinder tailoring, a paper plate or a film plate in which the plate is frequently exchanged requires time and labor to align the plate. As described above, in the case of multicolor printing, the alignment of the printing plate is important, and improvement of the above problem has been desired.

Also, in the plate mounting operation, when the pin hole of the plate is engaged with a positioning pin provided on the upper blade of the gripping side clamping device and inserted, or when the plate is attached to the plate cylinder tailoring after the insertion, There is a problem that the printing plate rises and comes off from the positioning pins, and measures such as providing a printing plate holding plate as described in the Japanese Utility Model Laid-Open Publication and providing a locking stop for preventing the lifting of the positioning pin head have been taken. However, it was not enough to quickly and easily perform the mounting and removing operations when replacing the printing plate. In particular, when removing the printing plate, the printing plate has a structure that does not easily come off from the positioning pins.In the case of a paper plate, the pin hole can be broken and removed, but it can not be used as a reprint after removal On the other hand, the film plate has a problem that the pin holes are not easily broken, and it requires labor to remove the pin holes.

In the above-mentioned apparatus, a gap y is formed between the plate cylinder tailoring 6 and the printing plate 1 at a portion extending from the clamping device to the plate cylinder, and depending on the type of printing press, this often causes head contamination during printing. Was the cause.

On the other hand, as described above, the plate holding portion of the clamp device is generally composed of an upper blade and a lower blade. The plate is formed by rotating an eccentric shaft such as a cam to press the upper blade to the lower blade. Is fixed. Originally, the basic design of the printing press is a PS plate specification, and the press plate contact surfaces of the upper blade and the lower blade generally have a surface shape as shown in FIG. A printing plate having sufficient hardness and thickness, such as a PS plate, can be fixed without any problem by the shape of the crimping surface, but a printing plate, such as a paper plate or a film plate, can be fixed to the printing plate by a clamping stress of a clamp. There is a problem that deformation and wrinkles occur, and the printing plate shifts during printing, and if the printing plate that was removed once after printing is used again as a printing plate, the grip part is deformed or damaged and it can not be used There were also problems.

[0014]

SUMMARY OF THE INVENTION The present invention is directed to an apparatus and a method for mounting a printing plate such as a paper plate or a film plate on a printing press. An object of the present invention is to provide a clamping device that facilitates quick and easy operation, reduces the operation of adjusting the printing plate position, and has no head dirt during printing. A second object is to provide a clamping device that prevents the displacement and wrinkling of the printing plate when the printing plate is mounted or printed, and a third object is to provide a more practical printing plate using the clamping device. It is to provide a mounting method.

[0015]

SUMMARY OF THE INVENTION The object of the present invention is to provide a clamping device provided in a notch on a peripheral surface of a plate cylinder.
The present invention has been attained by a clamp device comprising a plate cylinder tailoring mounting jig on a longitudinal side surface of the clamp device.

Further, a more practical effect is achieved by fixing superabrasive grains to at least one of the printing plate pressing surfaces of the printing plate holding portion of the clamping device.

Instead of directly attaching the paper plate or film plate to the plate cylinder,
The conventional methods for mounting on a plate cylinder such as a PS plate and the problems thereof are as described above. As a result of intensive research on these problems, the present inventor has found that a jig for mounting the plate cylinder tailoring is provided on the side surface in the longitudinal direction of the clamp device, and the plate cylinder tailoring is fixed to the side surface of the clamp device with the jig. Attention was paid to the fact that a printing plate can be mounted on the grip of the clamping device.

That is, conventionally, a plate cylinder tailoring is mounted on a holding portion of a clamping device, and a positioning plate and a plate pressing plate are provided on an upper surface of an upper blade of the clamping device to mount a paper plate or a film plate. The present invention has made it possible to mount a paper plate or a film plate on the holding portion of the clamp device.

Thus, the printing plate can be attached to the place where the original printing plate should be added, and the positioning reference pin of the clamping device can be used, thereby solving the problems of the prior art. Was. That is, the work of mounting and removing the printing plate can be quickly and easily performed, the work of adjusting the position of the printing plate can be reduced, and further, the head dirt during printing can be prevented.

Although the operation of mounting a printing plate such as a paper plate or a film plate has been greatly improved by the above-described clamping device of the present invention, a further effect can be realized by adding the following configuration. Was. That is, by fixing the superabrasive grains to at least one of the upper and lower blade press-contacting surfaces of the clamp device, the holding state of the plate could be made ideal.

The shapes and problems of the conventional upper and lower blade press-contacting surfaces of the plate are as described above. Unlike PS version,
In order to maintain the mounting state that the paper plate or film plate with low hardness, elasticity and thin thickness can withstand printing,
We focused on the importance of the surface shape of the upper and lower blade press-contacting surfaces.

As the super-abrasive used in the present invention, those having extremely high hardness such as diamond abrasive having a relatively uniform particle size and cubic boron nitride abrasive are preferable, and diamond abrasive is particularly preferable. The particle size is 50 to 200 mesh in JIS mesh size, preferably 80 mesh.
It is in the range of ~ 120 mesh.

As a method for fixing the superabrasive grains, an electroplating layer made of a metal such as nickel or a welding material layer made of a metal such as copper, silver and titanium is applied to the press-contacting surfaces of the upper blade and the lower blade of the clamp device holding portion. And embedding superabrasive grains in these layers is preferred.

The plate pressing surfaces of the upper blade and the lower blade to which the superabrasive grains are fixed are preferably uniform planes in order to reduce deformation and displacement of the plate due to tightening stress.

The super-abrasive grains may be fixed to either one of the upper and lower blades of the clamp, and preferably the super-abrasive grains are fixed to both the press-contact faces of the plate.

Further, the super-abrasive grains may be fixed to the printing plate pressing surfaces of both the holding side clamp and the rear side clamping device, or may be fixed only to the holding side clamping device. This depends on the printing plate mounting method described later and can be selected as appropriate.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is of course not limited to these.

FIG. 1 is a partial sectional view of a plate cylinder showing an embodiment of a printing plate mounting state of the present invention, and FIGS. 2 and 3 are one embodiment of a clamping device provided with a plate cylinder tailoring mounting jig of the present invention. FIG. FIG. 4 is a partial cross-sectional view of the clamping device showing the state of the superabrasive grain processing of the present invention, and FIG. 5 is a partially enlarged cross-sectional view of the superabrasive grain processing section 41 of FIG.

FIGS. 2 and 3 are sectional views showing a state in which the plate cylinder tailoring is mounted by the jig for the plate cylinder tailoring device provided on the side surface in the longitudinal direction of the clamping device, and the printing plate is mounted thereon. The configuration of the plate cylinder tailoring mounting jig mentioned here is not particularly limited. In short, it is sufficient that the plate cylinder tailoring can be fixed uniformly in the width direction and not to be shifted.

As an embodiment of the jig for the plate cylinder tailoring apparatus, there is a jig constituted by a pressing plate 51 and a tightening bolt 53 as shown in FIG. Further, as shown in FIG. 3, a tension bolt 54 for adjusting the tension of the plate cylinder tailoring 6 may be added.
In this configuration, the plate cylinder tailoring device 6 is tightened by the holding plates 51 and 52 on both sides, and the holding plate 52 is moved up and down by loosening or tightening the tension bolts 54.
The tension can be adjusted.

In FIGS. 4 and 5, the superabrasive grains 42 are fixed on the pressure-bonded surfaces of the upper blade 3 and the lower blade 4 so as to be embedded in an electroplating layer 43 of nickel. In this embodiment, diamond abrasive grains were used. The superabrasive grains 42 have a substantially majority part embedded in the nickel plating layer 43. Grinding may be performed in order to make the tip portions of the superabrasive grains projecting from the nickel plating layer uniform in height.

Next, a method of mounting a printing plate using the clamp device of the present invention will be described. By using the plate cylinder tailoring mounting jig shown in FIGS. 2 and 3, the efficiency of the plate mounting work can be greatly improved, but as shown in FIGS. By performing the abrasive processing, the efficiency of mounting work of a printing plate such as a paper plate or a film plate and the printing suitability have been further improved.

As shown in FIG. 1, the most preferable printing plate mounting method is a plate cylinder tailoring mounting jig 50 attached to the side of the clamping device 31 with the head of the plate cylinder tailor 6 made of a PS plate or the like. Then, the tail of the plate cylinder tailoring 6 is attached to the holding portion of the buttocks side clamping device 32 and attached to the plate cylinder 7, and the printing plate 1 is held with its head to the holding portion of the holding side clamping device 1, and It is to be attached so as to be stuck on the tailoring 6.

In this case, the printing plate 1 is stuck on the plate cylinder tailoring 6 with a double-sided adhesive tape, glue, water, or the like. Taken.
Further, in this printing plate mounting method, the jig for super-abrasive grain processing of the grip portion of the clamp device and the plate cylinder tailoring mounting need only be provided in the grip device on the grip side, and the rear clamp device may be the same as the conventional one.

According to this printing plate mounting method, the processing cost of the clamp device can be reduced in the mounting method using the plate cylinder tailoring.
This has the advantage that the printing plate apparatus can be easily and quickly performed.

Of course, according to the present invention, in addition to the above mounting method,
Both ends of the plate cylinder tailoring were fixed with the plate cylinder tailoring mounting jigs provided on the longitudinal side surfaces of both clamping devices and mounted on the plate cylinder, and both ends of the plate were subjected to superabrasive grain processing. In addition to the clamping device, it can be mounted on the plate cylinder tailoring.

[0037]

According to the present invention, when a printing plate such as a paper plate or a film plate is mounted on a plate cylinder made of a PS plate or the like, the clamping device and the printing plate mounting method of the present invention are used for mounting and removing the printing plate. This can be performed easily and quickly, and the work of adjusting the position of the printing plate can be reduced as compared with the related art, and furthermore, it is possible to prevent head contamination during printing. Furthermore, it is possible to prevent deformation and wrinkles of the printing plate when the printing plate is mounted, to prevent the printing plate from shifting during printing, and to use the printing plate once removed after printing as a printing plate again. Can be.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a plate cylinder showing an embodiment of a printing plate mounted state of the present invention.

FIG. 2 is a partial cross-sectional view showing one embodiment of a clamping device provided with a plate cylinder tailoring mounting jig of the present invention.

FIG. 3 is a partial cross-sectional view showing one embodiment of a clamping device provided with a plate cylinder tailoring mounting jig of the present invention.

FIG. 4 is a partial cross-sectional view of a clamp device showing a state of superabrasive processing according to the present invention.

FIG. 5 is a partially enlarged cross-sectional view of the superabrasive grain processing section of FIG.

FIG. 6 is a partial cross-sectional view of a conventional clamp device holding portion.

FIG. 7 is a partial cross-sectional view of a plate cylinder showing a conventional plate mounting state.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 printing plate 1b bottom of printing plate 1c pin hole of printing plate 2 positioning pin 3 upper blade of gripper on clamp side 4 lower blade of gripper on clamp side 5 cam of gripper on gripper 6 Upper blade of the clamping device 24 Lower blade of the buttocks side clamping device 25 Cam of the buttocks side clamping device 31 Holding side clamping device 32 Buttocks side clamping device 41 Super abrasive grain processing part 42 Super abrasive grains 43 Nickel plating layer 50 Jig 51 Pressing plate 52 Pressing plate 53 Tightening bolt 54 Tension bolt y Clearance between printing plate and plate cylinder

Claims (1)

(57) [Claims] 1. A clamping device provided in a notch on a peripheral surface of a plate cylinder, comprising a jig for tailoring and mounting a plate cylinder on a longitudinal side surface of the clamp device.