JPH0714654B2 - Plate cylinder for rotary copying machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cylindrical cylinder for a rotary copying machine, in which printing ink is supplied from the inside onto a screen (printing area), and in particular, a cylindrical body. Part of the peripheral side wall and the end face wall are integrally formed.

(B) Conventional Technology As is apparent from the specification of Japanese Patent Application No. 60-30043 filed by the applicant of the present invention, the conventional plate cylinder for a rotary copying machine is
The peripheral side portion and the end surface of the cylindrical body are formed as separate bodies, and are screwed to each other with a large number of screws.

This conventional plate cylinder for a rotary copying machine will be described with reference to FIGS. 2 to 4. 2 is a plan view showing a state in which the top cover is detached, FIG. 3 is a longitudinal sectional view, and FIG. 4 is a longitudinal sectional view showing a mode different from FIG.

In these figures, (1) is a cylindrical body that is fixed to the metal disk-shaped flanges (2) and (3) at both ends by screws (not shown), and its peripheral side wall is The printing area (4) corresponding to the printing surface has a porous structure that allows the penetration of printing ink, and the non-printing area (5) other than this printing area (4), that is, the printing base paper (not shown). The area that does not come into contact with the printing surface has a structure in which ink does not penetrate.

An injection port (6) for injecting ink into the cylindrical body (1) is formed in the center of the non-printing area (5) of the cylindrical body (1). A rubber annular seal member (7) is fitted to the edge portion. A shutter (8) is provided on the front and rear sides of the inlet (6) along the generatrix direction.
A pair of holding pins (9) and (10) for slidably holding the pin are planted, and fixing pins (12) (for fixing the top cover (11) to the outside of the holding pins (9) and (10). 13) is projected.

The shutter (8) has a flat convex cross section, and a slightly oval opening (14) having a short diameter substantially the same as that of the injection port (6) is bored in the elevated portion of the shutter (8). The hem portion extends in parallel with the generatrix of the cylindrical body (1) and has the holding pins (9) (1
A pair of long holes (15) and (16) which slidably engage with (0) are provided. An operating rod (17) for operating the shutter (8) is formed at one end of the shutter (8), and the other end of the shutter (8) and a spring stop pin (18) planted in the cylindrical body (1).
Tension springs (20) and (21) are stretched between and (19). The tension springs (20) (21) are pulled in a direction in which the opening (14) of the shutter (8) and the injection port (6) do not overlap each other, that is, the direction in which the injection port (6) is closed by the shutter (8). Being energized. Therefore, unless an external force is applied to the shutter (8), the injection port (6) is closed and sealed by the shutter (8).

The top cover (11) is fixed to the fixing pins (12) and (13) with screws (22) and (23), and the ink is placed at the central position of the top cover (11) and the injection port (6). An insertion hole (25) for inserting the discharge port of the container (24) is formed, and
The operation rod (17) of the shutter (8) is provided with an elongated hole (26) for reciprocating inside.

(27) is the rotation axis of the plate cylinder.

Thus, in order to inject ink into the plate cylinder, as shown in FIG. 4, first, the operating rod (17) of the shutter (8) is held by one hand, and this is held by the tension spring (20). The opening (14) of the shutter (8) and the inlet (6) of the cylindrical body (1) are superposed on each other by advancing in the opening direction against (21). Then, the ink container (24) is grasped by the other hand, and its discharge port is communicated with the insertion hole (25), the opening (14) and the injection port (6) to inject a required amount of ink. Finally, when the ink container (24) is pulled out from the inlet (6) and the operating rod (17) of the shutter (8) is released, the shutter (8) is repulsed by the tension springs (20) (21). It returns by the force of generation, the injection port (6) is closed by the shutter (8), and the original state is restored.

In the conventional plate cylinder for a rotary copying machine as described above, the peripheral side surface (5) of the cylindrical body (1) and the flanges (2) and (3) forming the end surfaces thereof are formed separately, and they are mutually It was connected to each other by tightening means such as screws.

(C) Problems to be Solved by the Invention As described above, in the conventional technique, the member having the peripheral side surface of the cylindrical body and the member having the end surface are formed as separate members. Since these are connected by a connecting means such as a screw, the manufacturing process is complicated and it is difficult to stabilize the quality.

In particular, if twisting occurs between both end faces, the member to be mounted in the printing area cannot be mounted accurately, which has a serious adverse effect on print quality.

Further, there is a problem that it is difficult to obtain a dynamic balance when the plate cylinder rotates.

Furthermore, in order to prevent the printing ink from leaking out from the minute gap between the peripheral side surface and the end surface, it is necessary to tighten both with a large number of screws, and it is difficult to reduce the number of parts.

The present invention has been made in view of the problems of the prior art, and is to solve the above problems by integrally forming the peripheral side surface portion and the end surface portion of the cylindrical body. is there.

(D) Means for Solving the Problems In the present invention, a printing area and a non-printing area are formed along the circumferential direction of a cylindrical body, and at least the base paper holding means is provided in the non-printing area, and the printing area is provided. In a plate cylinder for a rotary copying machine, in which a member that allows the permeation of printing ink is mounted, a disk-shaped or annular member forming both end surfaces of the cylindrical body and a direction parallel to the central axis of the cylindrical body. The member that extends and forms the non-printing region is integrally formed, and the member that is mounted in the printing region is formed separately from the member that forms the non-printing region. The inner walls of the disc-shaped or annular member integrally formed with the two are opposed to each other are flat.

(E) Operation In the present invention, a part of the peripheral side surface and the end surface portion of the cylindrical body are integrally formed, so that both are molded at once with plastic or aluminum.

Further, when the ink injection port is opened in the non-printing area of the cylinder, the printing ink can be injected into the plate cylinder through the ink injection port.

(F) Embodiment FIG. 1 and FIGS. 5 to 8 show an embodiment of the present invention. FIG. 1 is a schematic perspective view of a main part, and FIG.
6 is a plan view, FIG. 7 is a left side view, and FIG. 8 is a right side view. In these figures, the same parts as those in the conventional example shown in FIGS. 2 to 4 are designated by the same reference numerals.

As is clear from FIG. 1, in this embodiment, the member (5) of the cylindrical body (1) in which the non-printing area is formed,
The flanges (2) and (3) forming the left and right end faces are
It is integrally molded with so-called engineering plastic such as unsaturated polyester. A pair of ridges (28) (28) parallel to each other are formed in the vicinity of both ends of the non-printed area (5), and the ridges (28) (28) include clampers (29) (described later). 29) The rotation shaft (30) of (29) is inserted.

In the present embodiment, the radius of curvature of the non-printing area (5) is larger than the radius of curvature of the printing area (4), that is, the non-printing area (5) is more centrifugal than the printing area (4). It is configured so that it does not stick out.

A large diameter through hole (31) is formed in the left flange (3) of the cylindrical body (1), and a cover (32) having a diameter corresponding to the through hole (31) is fitted into the through hole (31). And are fixed with screws (33). This cover (32) is also made of the engineering plastic as described above. A bearing hole (34) for inserting the end of the left support shaft (36) is formed in the center of the cover (32), and the bearing hole (34) is inserted from the outside. The bearing (35) is fitted. Reference numeral (37) is a projection for driving the cylindrical body (1) when the rotational force is applied thereto. (39)… is the cover (32)
It is a rib for reinforcing.

A balancer (40) for dynamically balancing when the cylindrical body (1) is rotated is attached to the lower portion of the cover (32). Such a balancer (40) is also mounted near the lower end of the right flange (2). (41) ... are ribs for reinforcing the left flange (3).

The flange (2) on the right side of the cylindrical body (1) is provided with a small diameter through hole (42), and a collar (43) with a collar is provided inside.
Are inserted and fixed with screws (44). A bottomed hole (46) is bored from the right side of the collar (43), and a bearing (48) is fitted into the bottom hole (46) from the outside. The right support shaft (45) is inserted into the bearing (48). (49) ... are ribs for reinforcing the right flange (2).

A rib (38) for mounting a printing ink inlet (6), a shutter (8), and a tension spring (20) similar to the conventional example in the non-printing area (5) of the cylindrical body (1). And many projections (47), engaging pieces (51), etc. are integrally formed. The method of injecting the printing ink into the plate cylinder is the same as in the case of the above-mentioned conventional technique.

Further, as described above, the rotary shaft (30) provided between the pair of ridges (28, 28) has an E-shaped clamper (as shown in FIG. 6) as a base paper holding means. 29) (29) (2
9) is fixed, and this clamper (29) (29) (2
9) and the top cover (11) are configured to hold the edge of the base paper. This clamper (29) (29) (2
Instead of 9), a conventionally known protrusion may be formed.

A thin net-like metal plate (screen) that allows the penetration of printing ink is fixed to the printing area (4) with screws (50) ...

(G) Effect of the Invention In the present invention, since the member forming the non-printing region of the cylindrical body and the member forming the both end surfaces are integrally formed, it is not necessary to assemble these structures separately after assembling them. The manufacturing process can be simplified and the number of steps can be reduced.

Further, even if the die is accurately formed, no assembly error occurs and no twist occurs between both end faces. Therefore,
It is possible to realize a high-quality plate cylinder for a rotary copying machine.

Furthermore, if integrally formed, the screw will not loosen even after long-term use (there is no screw in the integrally formed portion), and maintenance-free can be realized.

Furthermore, since it is not necessary to cut the outer periphery of the flange portion, a post-processing step is unnecessary, and the number of steps can be further reduced.

Since it can be formed of plastic, the plate cylinder as a whole is light in weight, and the motor for rotating the plate cylinder and the like can be downsized. Therefore, it can also contribute to the cost reduction of the entire rotary copying machine.

[Brief description of drawings]

1 and 5 to 8 show an embodiment of the present invention, and FIGS. 2 to 4 show a conventional example. FIG. 1 is a schematic perspective view of an essential part, FIG. 2 is a plan view, FIG. 3 is a longitudinal sectional view, FIG. 4 is a longitudinal sectional view, FIG. 5 is a longitudinal sectional view, FIG. 6 is a plan view, and FIG. The figure is a left side view, and FIG. 8 is a right side view. (1) ... Cylinder, (2) (3) ... Flange (end face), (4) ... Printed area, (5) ... Non-printed area,
(6) ... injection port, (8) ... shutter, (29) ... clamper (base paper holding means).

Claims (4)

[Claims] 1. A printing region and a non-printing region are formed along a circumferential direction of a cylindrical body, and at least the base paper holding means is provided in the non-printing region, and the printing region allows permeation of printing ink. In a plate cylinder for a rotary copying machine equipped with a disc-shaped or annular member forming both end faces of the cylindrical body, a member extending in a direction parallel to the central axis of the cylindrical body and forming the non-printing area. A disc formed integrally with the non-printing area, and the member attached to the printing area is formed separately from the member forming the non-printing area. A plate cylinder for a rotary copying machine, wherein inner walls of the circular or annular members facing each other are flat. 2. The plate cylinder for a rotary copying machine according to claim 1, wherein the non-printing area and the member forming the end surface of the cylindrical body are made of engineering plastic. 3. A plate cylinder for a rotary copying machine according to claim 1, wherein a projection for holding an edge portion of the base paper is formed in the non-printing area. 4. A plate cylinder for a rotary copying machine according to claim 1, wherein a clamper for holding an edge portion of the base paper is mounted in the non-printing area.