JPH038436Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a plate fixing device in a rotary printing press.

[Conventional technology]

Generally, the plate cylinder in a newspaper rotary printing machine has a length that allows multiple printing plates to be attached to it, and both ends of the printing plate wrapped around the outer circumferential surface of the plate cylinder are connected to the printing plates built into the plate cylinder. It is designed to be removably fixed by a fixing device.

Many types of plate fixing devices have been proposed so far. For example, in Japanese Patent Publication No. 50-35845, a housing profile is installed in an axially extending groove formed on the surface of a plate cylinder, and a blade-shaped convex edge is formed on the upper inner surface of a pair of side walls that constitute the housing profile. The folded piece formed at one end of the printing plate is engaged with the blade-like convex bend, the plate is wrapped around the outer peripheral surface of the plate cylinder, and the bent piece formed at the other end of the printing plate is engaged. The present invention discloses a device for attaching and removing a thin printing plate, which is inserted into a groove at the tip of a swinging member disposed between the side walls, and tightens the printing plate by the swinging of the swinging member.

[Problem that the invention attempts to solve]

However, in the above-described attachment/detachment device, the swinging member is swung in the plate fixing direction or the plate loosening direction by the expansion of a hollow elastic body provided at the back of the oscillating member. In a plate cylinder in which a plate can be attached, it is necessary to pass through a groove that houses the plate fixing mechanism from one end of the plate cylinder to the other, and the printing pressure suddenly decreases at the position of the groove. There's a problem. Further, by expanding the hollow elastic body, the rocking members of each printing plate fixing mechanism swing simultaneously, so there is a problem that the printing plates cannot be replaced individually.

Therefore, the technical object of this invention is to solve the above-mentioned problems, to facilitate the attachment and detachment of printing plates, and to enable each of the plurality of printing plate fixing mechanisms to be operated independently.

[Means for solving problems]

In order to solve the above problems, this invention provides an engagement groove extending in the axial direction on the outer circumferential surface of the plate cylinder, and of the both sides of the engagement groove, the trailing side with respect to the rotation direction of the plate cylinder A locking protrusion that can be engaged with a bent piece formed on one end edge of the printing plate is formed on the side opening edge of the printing plate, and inside the locking groove there are provided a plurality of operation buttons movable in the radial direction of the plate cylinder. a plate and a plate fixing block disposed in front of the plate and swingable toward the operating plate; a spring for pressing the operating plate toward the opening of the engagement groove; An engaging piece is formed on the outer diameter side of the plate, and a spring is provided to press the plate fixing block toward the operation plate. A protrusion is formed on one side of the opposing surface of the printing plate fixing block and the operation plate, and a recess into which the protrusion can fit is formed on the other side. The formation position is regulated.

[Effect]

In the printing plate fixing device having the above configuration,
A bent piece formed on one edge of the printing plate is engaged with the locking protrusion of the engagement groove, and the plate is wrapped around the outside of the plate cylinder, and the bent piece on the other edge is inserted inside the engagement groove. from there, push the operation plate toward the center of the plate cylinder,
When the protrusions and recesses formed on the opposing surfaces of the operating plate and the plate fixing block are opposed to each other, the plate fixing block swings toward the operating plate due to the elasticity of the spring, and the plate is fixed during the swinging. Since the engaging piece of the block engages with the bent piece formed on the other edge of the printing plate and pulls the printing plate in the winding direction, the printing plate can be attached to the outside of the printing cylinder.

Also, insert your fingertip inside the engagement groove to engage the engagement part of the plate fixing block, and then swing the plate fixing block in the direction away from the operation plate to engage the protrusion and the recess. When released, the operating plate moves outward due to the elasticity of the spring, and the tips of the projections come into contact with one of the opposed surfaces of the plate fixing block and the operating plate. Therefore, the plate fixing block is held in a swinging state, and the engaging piece separates from the bent piece of the plate, allowing the plate to be removed from the plate cylinder.

〔Example〕

As shown in the figure, a block fitting groove 2 extending in the axial direction is formed on the outer peripheral surface of the plate cylinder 1. Two block fitting grooves 2 are formed with the axial center of the plate cylinder 1 as a boundary, and each block fitting groove 2 is phased in the circumferential direction of the plate cylinder 1 in order to keep the printing pressure as uniform as possible. In the illustrated embodiment, only one fitting groove 2 is shown, and the other fitting groove is omitted.

A support block 3 is fitted inside the fitting groove 2 and fixed by a bolt 4 screwed into the bottom of the groove (see FIG. 2). The outer circumferential surface of the support block 3 is an arcuate surface continuous with the outer circumferential surface of the plate cylinder 1, and an engagement groove 5 extending in the axial direction is formed in the arcuate surface. Further, notched recesses 6 are provided at both ends of the arcuate surface of the support block 3, and pieces 7 for positioning the side edges of the printing plate A are screwed into the notched recesses 6.

As shown in FIGS. 3 and 4, protrusions 8 that protrude inward are formed on both opening edges of both sides of the engagement groove 5, and the protrusions 8 are formed in the direction of rotation of the plate cylinder 1 (as indicated by the arrow in FIG. 4). A bent piece B formed at one end of the printing plate A can be engaged with a protrusion 8 protruding from the side opening edge on the trailing side of the printing plate A. Hereinafter, this protrusion 8 will be referred to as a locking protrusion.

Furthermore, bearing blocks 9 are fixed to both ends and the center of the bottom surface of the engagement groove 5, and between adjacent bearing blocks 9, a plurality of operation plates 10 are arranged.
A pair of elongated plate-shaped plate fixing blocks 11 are disposed at the front side of the plate, and pins 12 provided at the bottom of both end faces of each plate fixing block 11 are rotatably supported by the plate fixing blocks 11. There is.

The operation plate 10 is disposed between a guide plate 13 provided on the bearing block 9 and the printing plate fixing block 11, and a part thereof fits into a guide groove 14 formed in the block 11, and is moved in the radial direction of the plate cylinder 1. It's becoming possible. Further, an operation plate 10 is provided on the inner diameter side of the operation plate 10.
A retaining piece 15 is formed that protrudes in the direction of , and the retaining piece 15 fits into a notch 16 provided on the inner diameter surface of the operation plate 10 .
A spring 17 provided below presses the operating plate 10 toward the opening of the engagement groove 5 (see FIG. 4).

Further, a protrusion 18 is formed on the surface of the operation plate 10 facing the plate fixing block 11, and a recess 19 into which the protrusion 18 can fit is provided in the plate fixing block 11. When pushed toward the center of the barrel 1, the protrusion 18 fits into the recess 19 (see Figure 3).

A plate spring 20 stands up on the front end surface of the printing plate fixing block 11, and a dogleg-shaped engagement piece 21 is formed at the tip of the plate spring 20, and the engagement piece 21 is attached to the other end of the printing plate A. It is designed to be able to engage with the formed bent piece C. As shown in FIG. 1, on the side surface of the engagement groove 5 facing the plate fixing block 11,
A plurality of horizontal holes 22 are provided, and a presser 23 and a spring 24 are arranged in each horizontal hole 22 to press the printing plate fixing block 11 toward the operation plate 10.

Now, the bent piece B at one end of the printing plate A is engaged with the locking protrusion 8 of the engagement groove 5, and the printing plate A is wrapped around the outer circumferential surface of the plate cylinder 1, and the bent piece C at the other end is engaged. As shown in FIG. 4, position the operation plate 10 inside the engagement groove 5
toward the center of the plate cylinder 1, and push the protrusion 18 into the recess 1.
9, the printing plate fixing block 11 rotates about the pin 12 toward the operation plate 10. Therefore, the protrusion 18 fits into the recess 19, and the engaging piece 21 engages with the bent piece C at the other end of the printing plate A, attracting the bent piece C, and presses the plate to the outside of the plate cylinder 1. Plate A can be mounted under tension (see Figure 3).

The printing plate may be used for one-page printing or two-page printing. In the printing plate for two-page printing, the folded piece C is attracted by a pair of printing plate fixing blocks 11.

In addition, when a fingertip is inserted into the engagement groove 5 to engage the bending piece 21 and pushing the bending piece 21, the printing plate fixing block 11 is swung in the direction away from the operation plate 10. The recess 19 is removed from the protrusion 18, and at the same time, the operation plate 10 is moved toward the opening of the engagement groove 5 by the pressure of the spring 17. For this reason,
The projection 18 of the operation plate 10 is connected to the printing plate fixing block 11.
The plate fixing block 11 is prevented from swinging toward the operation plate 10 by coming into contact with the opposing surface of the plate A, while the engaging piece 21 of the plate fixing block 11 is in contact with the bending piece C of the plate A.
The plate A can be removed from the outside of the plate cylinder 1 (see FIG. 4).

In addition, in the case of the embodiment, the protrusion 18 is provided on the operation panel 10.
, and the concave portion 19 is formed in the printing plate fixing block 11, but the formation positions of both may be reversed.

〔effect〕

As described above, according to this invention, the bent piece at one end of the printing plate is engaged with the locking protrusion of the engagement groove, the printing plate is wrapped around the outside of the plate cylinder, and the bent piece at the other end is bent. The printing plate can be attached to the outside of the plate cylinder by pushing the operation plate toward the center of the plate cylinder after placing the piece facing the inside of the engagement groove. When pushed in the direction away from the operating plate, the engagement between the folded piece and the folded piece of the printing plate is released and the printing plate can be removed, making it extremely easy to attach and remove the printing plate.

In addition, the printing plate can be attached and removed by pushing the operation plate toward the center of the plate cylinder and pulling the engagement piece of the plate fixing block with your fingertips.
By attaching a plurality of fixing devices according to this invention to the plate cylinder, each printing plate can be individually attached and detached page by page or every two pages.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view showing an embodiment of the fixing device according to the invention, Fig. 2 is a longitudinal sectional front view of the same, Fig. 3 is a longitudinal sectional side view of the same, and Fig. 4 is an operation of the same. FIG. 5 is an exploded perspective view of a portion of the same. DESCRIPTION OF SYMBOLS 1...Plate cylinder, 5...Engagement groove, 8...Protrusion (locking protrusion), 10...Operation plate, 11...Plate fixing block, 17...Spring, 18...Protrusion, 1
9... recess, 21... engaging piece, 24... spring.

Claims (1)

[Scope of utility model registration request] An engagement groove extending in the axial direction is provided on the outer peripheral surface of the plate cylinder,
Of both side surfaces of the engagement groove, a locking protrusion that can be engaged with a bent piece formed at one end edge of the printing plate is formed on the opening edge of the side surface on the trailing side with respect to the rotational direction of the plate cylinder; Inside the engagement groove, there are provided a plurality of operation plates movable in the radial direction of the plate cylinder, and a plate fixing block arranged in front of the operation plates and swingable toward the operation plates. A spring is provided to press the plate toward the opening of the engagement groove, and an engagement piece that can engage with a bent piece formed on the other edge of the plate is provided on the outer diameter side of the plate fixing block. forming a spring for pressing the printing plate fixing block toward the operating plate; forming a protrusion on one of the facing surfaces of the printing plate fixing block and the operating plate, and forming a recess into which the protrusion can fit on the other side; A plate fixing device for a rotary printing press, in which the formation positions of the protrusions are regulated so that when the operation plate is pushed in the radial direction, the protrusions fit into the recesses.