JPH0839780A - Clamp device for printing machine and method for setting press plate - Google Patents

Abstract

PURPOSE:To provide a clamp device wherein a press plate can be easily set or dismantled and a press plate position adjusting work can be reduced and further a head is prevented from being soiled during printing by providing a plate cylinder cover setting jig on the side surface in the longitudinal direction of the clamp device which is provided in a notch in the periphery of a plate cylinder. CONSTITUTION:A most preferable press plate setting method is such that a head of a plate cylinder cover 6 composed of PS plate or the like is mounted to the side surface of a grip side clamp device 31 using a plate cylinder cover setting jig 50, and the end of the cover 6 is fastened to a gripping part of an end side clamp device 32 to attach the cover 6 to a plate cylinder 7, and the head of a press plate 1 is put into a gripping part of the grip side clamp device 31 so as to be bonded onto the cover 6, wherein the press plate 1 is bonded onto the cover 6 by means of an adhesive double coated tape, paste, water etc., and the end side 1b of the press plate terminates on the cover 6 in a manner as is called 'a stream method'. In this press plate setting method wherein the plate cylinder cover is used, processing cost of the clamp device can be reduced and setting of the press plate can be easily and rapidly performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device for a printing press and a method for 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 for mounting on a body and a mounting method.

[0002]

2. Description of the Related Art As a printing plate for printing, there are a PS plate using an aluminum plate, a paper plate using a paper, a film plate using a plastic film, and the like, which are properly used according to the purpose of printing. The PS plate can print about 10 times as many sheets as the paper plate, but since it is expensive, the paper plate and the film plate have been widely used in the field of light printing with a small number of print copies in recent years.

In recent years, there has been a strong demand for multicolor printing such as color printing on a paper plate or a film plate, and the demand has been met. As is well known, precise position adjustment of the printing plate is important for multicolor printing, and the method of holding the printing plate in the clamp device like the PS plate and mounting it directly on the plate cylinder is the same as the paper plate or film plate. The plate with low strength has a problem that wrinkles are likely to occur during position adjustment.

Therefore, in order to solve this problem, a plate cylinder such as a PS plate is preliminarily mounted on the plate cylinder without mounting the paper plate or film plate directly on the plate cylinder, and the paper plate or film plate is mounted thereon. A method is used in which the position of the printing plate can be adjusted by mounting and moving the plate cylinder.

As this method, there is known a method of providing a plate mounting plate, a plate positioning pin and a plate pressing plate on the upper blade of the holding side clamping device to which the plate cylinder tailor is attached. -175819, 3-
It is disclosed in detail in Japanese Patent No. 19037.

FIG. 7 is a partial cross-sectional view of the plate cylinder of the printing machine relating to the above-mentioned U.S. Pat. Nos. 1,75,819 and 3,190,37, the main structure of which is almost the same as that of the present invention. The clamp device 31 on the gripper side is provided in the notch of the plate cylinder 7.
The gripper side clamping device 32 is housed, and the clamping device mainly comprises upper blades 3, 23, lower blades 4, 24 and cams 5, 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 stiffness and weak strength such as a paper plate or a film plate cannot be directly mounted on the plate cylinder 7, the plate cylinder tailor 6 made of a PS plate or the like in advance is used. Grips the gripping devices 31 and 32 on both the gripping side and the butt side and attaches them to the plate cylinder 7, and then attaches the printing plate 1 such as a paper plate or a film plate with glue or double-sided adhesive tape. It was attached to the plate cylinder 7 through the body tailoring 6.

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

However, in these methods, while the upper blade and the lower blade of the clamp device are repeatedly attached and detached by exchanging the plate cylinder tailoring or the like, the upper blade of the clamp device is displaced, which causes the upper blade of the clamp device to be installed. There is a problem in that the positioning pins that are formed are misaligned.

Therefore, in the conventional plate mounting apparatus using plate cylinder tailoring, a paper plate or a film plate whose plate is frequently exchanged requires time and labor for aligning the plate, especially in color printing. As described above, in the case of multicolor printing, the alignment of the printing plate is important, and improvement of the above problems has been desired.

Further, in the plate mounting operation, when the pin hole of the plate is engaged with the positioning pin provided on the upper blade of the gripping side clamping device, or when the plate is attached to the plate cylinder after the insertion, There is a problem that the printing plate floats up from the positioning pin and comes off, and measures have been taken such as providing a plate pressing plate as described in the above-mentioned Japanese Utility Model Publication, or providing a locking stopper for preventing the floating of the positioning pin head. However, it was not enough to quickly and easily attach and detach the plate when replacing it. In particular, when the plate is removed, the plate does not come off easily from the positioning pins. In the case of a paper plate, it is possible to remove it by breaking the pin hole, but it cannot be used as a reprint after removal. On the other hand, the film plate has a problem that the pin hole is not easily broken and labor is required for removal, and therefore improvement has been desired.

Further, in the above device, a gap y is generated between the plate cylinder tailor 6 and the printing plate 1 in the portion extending from the clamp device to the plate cylinder, which often causes head stains during printing depending on the type of printing machine. Was the cause of.

On the other hand, as described above, the plate gripping portion of the clamping device is generally composed of an upper blade and a lower blade, and the eccentric shaft such as a cam is rotated to press the upper blade onto the lower blade to press the plate. It has a mechanism to fix. Originally, the basic design of the printing machine is the PS plate specification, and the plate contacting surfaces of the upper and lower blades 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 pressure-bonding surface, but a printing plate such as a paper plate or a film plate can be fixed to the printing plate by the clamping stress of the clamp. There is a problem that deformation and wrinkles occur, and the printing plate shifts during printing, and when the printing plate removed once after printing is used again as a printing plate, the gripping part is deformed or damaged and it cannot be used There was also a problem.

[0014]

SUMMARY OF THE INVENTION The present invention has been made to an apparatus and method for mounting a printing plate such as a paper plate or a film plate on a printing machine, and a first object thereof is to mount and dismount the printing plate. (EN) A clamp device that facilitates the work quickly and reduces the work of adjusting the printing plate position, and that does not stain the head during printing. A second object is to provide a clamp device which prevents the displacement and wrinkles of the plate when the plate is attached or during printing, and the third object is to provide a more practical plate using the clamp device. It is to provide a mounting method.

[0015]

The above object of the present invention is to provide a clamping device provided in a notch portion of a peripheral surface of a plate cylinder,
This is achieved by a clamp device characterized in that a plate cylinder tailoring attachment jig is provided on a side surface in the longitudinal direction of the clamp device.

Further, more practical effects have been achieved by fixing the superabrasive grains on at least one plate pressing surface of the plate gripping portion of the clamp device.

Do not mount the paper plate or film plate directly on the plate cylinder,
The conventional methods for mounting on a plate cylinder such as a PS plate and their problems are as described above. As a result of diligent research on these problems, the present inventor has provided a jig for plate cylinder tailoring attachment on the side surface in the longitudinal direction of the clamp device and fixing the plate cylinder tailor to the side surface of the clamp device with the jig. , It was noted that the plate can be attached to the grip of the clamp device.

That is, conventionally, the plate cylinder tailoring is attached to the grip portion of the clamp device, and the positioning pin and the plate retainer plate are provided on the upper surface of the upper blade of the clamp device to attach the paper plate or the film plate. The present invention makes it possible to attach a paper plate or a film plate to the holding part of the clamp device.

As a result, the plate can be gripped and mounted where it should be gripped, the positioning reference pin of the clamp device can be used, and the problems of the prior art can be solved. It was That is, it is possible to quickly and easily attach and remove the printing plate, reduce the position adjustment work of the printing plate, and prevent head stains during printing.

The above-described clamping device of the present invention has greatly improved the work of mounting a printing plate such as a paper plate or a film plate. However, by further adding the following configuration, a further effect can be realized. It was That is, the gripping state of the plate can be made ideal by fixing the superabrasive grains to the plate pressing surface of at least one of the upper blade and the lower blade of the clamp device.

The shapes of the conventional plate-pressing surfaces of the upper and lower blades and their problems are as described above. Unlike the PS version,
In order to maintain the mounting condition that the paper plate or film plate with low hardness, elasticity and thin thickness can withstand printing,
We paid attention to the fact that the surface shapes of the plate pressing surfaces of the upper and lower blades are important.

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

As a method of fixing the superabrasive grains, an electroplating layer made of a metal such as nickel or a welding material layer made of copper, silver, titanium or the like is formed on the press-bonding surfaces of the upper blade and the lower blade of the clamp device gripping portion. Is preferred, and the superabrasive grains are embedded in these layers.

The plate contact surfaces of the upper and lower blades to which the superabrasive grains are fixed are preferably flat surfaces in order to reduce deformation and displacement of the plate due to tightening stress.

The superabrasive grains may be fixed to the press plate pressing surface of either the upper blade or the lower blade of the clamp, but it is preferable to fix the superabrasive particles to both press plate pressing surfaces.

Further, superabrasive grains may be fixed to the plate pressing surfaces of both the clamps on the gripping side and the clamps on the trailing side, or may be fixed only on the clamper on the gripping side. This varies depending on the plate mounting method described later and can be appropriately selected.

[0027]

The present invention will be described below in detail with reference to the drawings, but the present invention is not limited to these.

FIG. 1 is a partial sectional view of a plate cylinder showing an embodiment of a plate mounting state of the present invention, and FIGS. 2 and 3 are embodiments of a clamp device equipped with a plate cylinder tailoring mounting jig of the present invention. FIG. FIG. 4 is a partial sectional view of the clamp device showing a state of superabrasive grain processing of the present invention, and FIG. 5 is a partially enlarged sectional view of the superabrasive grain processing part 41 of FIG.

FIGS. 2 and 3 are sectional views showing a state in which the plate cylinder tailor is mounted by a jig for the plate cylinder tailor provided on the longitudinal side surface of the clamp device, and the printing plate is mounted thereon. The configuration of the plate cylinder tailoring / attaching jig here is not particularly limited. In short, it suffices that the plate cylinder can be fixed uniformly in the width direction so as not to shift.

As an embodiment of the jig for the plate cylinder tailor, there is one constituted by a holding 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 tailor 6 may be added.
In this structure, the plate cylinder tailoring 6 is fastened with 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-bonding surfaces of the upper blade 3 and the lower blade 4 so as to be embedded in the nickel electroplating layer 43. In this example, diamond abrasive grains were used. The super-abrasive grains 42 are embedded in the nickel plating layer 43 in a substantially majority portion. In order to make the heights of the tips of the superabrasive grains protruding from the nickel plating layer uniform, grinding may be performed.

Next, a plate mounting method 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 significantly improved, but as shown in FIGS. By performing the abrasive grain processing, the efficiency of the work of mounting a printing plate such as a paper plate or a film plate and the printability were further improved.

The most preferable method of mounting the plate cylinders is to mount the plate cylinder tailoring jig 50 on the side surface of the holding side clamping device 31 with the head of the plate cylinder tailoring 6 made of a PS plate as shown in FIG. , The butt of the plate cylinder tailor 6 is attached to the grip portion of the butt side clamp device 32 and mounted on the plate cylinder 7, and the plate 1 is held by the grip portion of the clamp side clamp device 1 to hold the plate. It is to be attached so as to be stuck on the body tailoring 6.

In this case, the printing plate 1 is stuck on the plate cylinder tailor 6 with double-sided adhesive tape, glue, water, etc., and the bottom side 1b of the plate is a so-called wiping system which stops on the plate cylinder tailor 6. Taken.
Further, in this plate mounting method, the jig for superabrasive graining and plate cylinder tailoring mounting of the gripping portion of the clamp device may be provided only in the gripping side clamping device, and the tail side clamping device may be the same as the conventional one.

This printing plate mounting method can reduce the processing cost of the clamp device in the mounting method using plate cylinder tailoring,
There is an advantage that the printing plate device can be easily and quickly used.

Of course, the present invention is not limited to the above mounting method,
Both ends of the plate cylinder tailoring are fixed to the plate cylinder by jigs for plate cylinder tailoring mounting provided on the longitudinal side surfaces of both clamp devices and mounted on the plate cylinder, and both ends of the plate are subjected to superabrasive processing. It can also be attached to the top of the plate cylinder by holding it in the clamp device.

[0037]

When a printing plate such as a paper plate or a film plate is mounted on a plate cylinder such as a PS plate, the clamping device and the plate mounting method of the present invention are the work of mounting and removing the plate. Can be performed easily and quickly, the work of adjusting the position of the printing plate can be reduced as compared with the conventional one, and the head stain at the time of printing can be prevented. Furthermore, it is possible to prevent the plate from deforming and wrinkling when it is mounted, and to prevent the plate from slipping during printing, and to use the plate once removed after printing again as a plate. You can

[Brief description of drawings]

FIG. 1 is a partial sectional view of a plate cylinder showing an embodiment of a plate mounting state of the present invention.

FIG. 2 is a partial cross-sectional view showing an embodiment of a clamp device equipped with a plate cylinder tailoring attachment jig of the present invention.

FIG. 3 is a partial cross-sectional view showing an embodiment of a clamp device equipped with a plate cylinder tailoring attachment jig of the present invention.

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

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

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

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

[Explanation of symbols]

 1 Plate 1b Plate bottom 1c Plate pin hole 2 Positioning pin 3 Upper blade of gripper side clamp device 4 Lower blade of gripper side clamp device 5 Cam of gripper side clamp device 6 Plate cylinder tailor 7 Plate cylinder 23 Bottom side Upper blade of clamping device 24 Lower blade of rear side clamping device 25 Cam of rear side clamping device 31 Holding side clamping device 32 Rear side clamping device 41 Superabrasive grain processing part 42 Superabrasive grain 43 Nickel plating layer 50 For plate tailoring installation Jig 51 Press plate 52 Press plate 53 Tightening bolt 54 Tension bolt y Clearance between plate and plate cylinder

Claims (2)

[Claims] 1. A clamp device provided in a cutout portion on a peripheral surface of a plate cylinder, comprising a plate cylinder tailor mounting jig on a longitudinal side surface of the clamp device. 2. The clamp device according to claim 1, wherein superabrasive grains are fixed to at least one plate pressing surface of the plate gripping portion of the clamp device.