JPH0428766Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a plate surface dust removal device for a printing press that removes dust such as paper powder adhering to the plate surface of a plate cylinder.

[Conventional technology]

During printing operations using various printing machines, dirt such as ink scum, paper dust, and Molton's hair often adheres to the surface of the plate mounted on the plate cylinder, causing stains on the printed matter. This needs to be removed between jobs.

Conventionally, this type of dust removal device has a holder supported by a square stay close to and parallel to the plate cylinder so as to be able to reciprocate in the direction of the cylinder axis, and a slide bar at the tip inserted into a hole in the holder perpendicular to the square stay. Dust is removed by moving the holder back and forth while pressing the wiper against the plate surface of the rotating plate cylinder. After removing dust, the slide bar is removed from the holder and the dust attached to the wiper at the tip of the slide bar is wiped off with a rag. Insert it into the holder again and finish the work.

[Problem that the invention attempts to solve]

However, in such conventional dust removal devices, the hole in the holder and the wiper in the slide bar have the same dimensions and are tightly fitted, so when the slide bar is removed, the dust attached to the wiper is removed from the hole in the holder. Since the dust was transferred to the surrounding area, there was a problem in that when inserting the slide bar, this dust was transferred to the wiper again and returned to the printing plate.

[Means for solving problems]

In order to solve these problems, in the present invention, a holder is fitted to a stay parallel to the plate cylinder so that it can move back and forth, and a slide bar that can move forward and backward with respect to the plate surface is inserted into the hole of this holder. The cross-sectional dimensions of the wiper were set to be smaller in each direction than the cross-sectional dimensions of the hole in the holder.

[Effect]

With this configuration, when the wiper at the tip of the slide bar is pressed against the plate surface while rotating the plate cylinder and the holder is reciprocated, dust from the plate surface adheres to the wiper, so the wiper is removed to wipe off the dust. Since the wiper is made smaller than the hole in the holder, even if the slide bar is inserted and removed, dirt will not transfer to the slide bar again through the hole in the holder.

〔Example〕

1 to 4 show an embodiment of the printing plate dust removal device according to the present invention, and FIG. 1 is a longitudinal sectional view thereof;
Figure 2 is a plan view, Figure 3 is a perspective view,
FIG. 4 is a side view during dust removal work.

In the figure, a plate is attached to the circumferential surface of a plate cylinder 2 that is supported by frames 1 on both sides of the machine, and a plurality of ink forming rollers 3 are attached to and detached from the circumferential surface of the plate. They are placed facing each other. On the other hand, a square stay 4 is supported between the frames 1 on both sides in parallel with the axial direction of the plate cylinder 2.
A holder, generally designated by reference numeral 5, is fitted in the holder so as to be reciprocally movable. The holder 5 is integrally formed with a U-shaped main body 5a having three surfaces that come into sliding contact with the stay 4, and a retaining plate 5b fixed to the main body 5a with a set screw 6. A hole 5c having a rectangular cross section is provided. Reference numeral 7 denotes an elongated slide bar having a cross-sectional shape that fits into the hole 5c, and is slidably inserted into the hole 5c, and a knob 9 is attached to the rear end of the bar via a square plate-shaped stopper 8. It is fixed at 10. Further, a rectangular plate-shaped wiper 11 is fixed to the tip of the slide bar 7 with a presser plate 12 and a countersunk screw 13, and the dimensions of the wiper 11 are wider and thicker than the dimensions of the hole 5c of the holder 5. Both are small in size. Further, a screw hole 5d is provided on the surface of the holder main body 5a facing the stopper 8, and a spring holder 14 formed in a cylindrical shape with a bottom is screwed into the screw hole 5d so as to be freely adjustable forward and backward. Inside 14 is a compression coil spring 1 which biases the plunger 15 protruding from the stopper 8 so as to press it against the stopper 8.
6 is loaded. By doing so, by grasping the knob 9 and pushing it toward the holder 5, the plunger 15 pulls into the spring holder 14 while compressing the compression coil spring 16, and the wiper 11 at the tip of the slide bar 7 is pressed against the plate surface. Also, knob 9
When the user releases his/her hand, the plunger 5d protrudes due to the elastic force of the compression coil spring 16, the slide bar 7 is pushed, and the wiper 11 is moved away from the printing plate.

The operation of the dust removal device configured as above will be explained. When the dust removal device is not in use, it is stored in a position close to the frame 1 on one side.
In addition, since the plunger 15 biased by the compression coil spring 16 is pushing the stopper 8, the slide bar 7 is retreating from the holder 5, and the wiper 1
A predetermined gap is maintained between 1 and the printing plate. If dust adheres to the plate surface, the entire dust removal device is moved laterally by rotating the plate cylinder 2 at a low speed, gripping the knob 9 and sliding the holder 5 on the square stay 4. the wiper 11 to face the dust. After scolding snacks 9
is pushed against the elastic force of the compression coil spring 16 to transfer the dust to the wiper 11. If the dust is attached to several places, repeat this operation to transfer all the dust to the wiper 11. let After removing the dust in this way, when the knob 9 is pulled, the slide bar 7 can be easily pulled out from the holder 5 since it is not locked at any point. After wiping off the dust transferred to the wiper 11 of the removed slide bar 7 with a waste cloth, the slide bar 7 is inserted into the holder 5 to complete the dust removal work. In such dust removal work, the slide bar 7 with dust attached to the wiper 11 is moved to the holder 5.
When pulling it out from the hole 5 shown in FIG.
Dust from the wiper 11 tends to transfer to the inlet of the wiper 11, but in this device the wiper 11 is formed smaller than the hole 5c, so the dust remains attached to the wiper and moves to the hole 5.
c and is taken out of the holder 5. Therefore, even if the slide bar 7 is inserted into the holder 5 after this, there is no fear that the dust will transfer to the printing plate again. Note that by rotating the spring holder 14 back and forth, the pressing force when gripping the knob 9 and pressing the wiper 11 against the plate surface is adjusted.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in the plate dust removal device of a rotary printing press,
A holder is fitted to a stay parallel to the plate cylinder so that it can freely reciprocate, and a slide bar that can move forward and backward with respect to the plate surface is inserted into the hole of this holder, and the cross-sectional dimension of the wiper at the tip is set to be larger than the cross-sectional dimension of the hole in the holder. By setting both the width and thickness to be small, not only is the structure simple and the dust removal work can be carried out efficiently, but there is also a gap between the wiper and the hole in the holder when removing the slide bar. Dust attached to the wiper can be taken out and removed from the holder without being transferred to the hole of the holder, improving dust removal performance.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the printing plate dust removal device according to the present invention, and FIG. 1 is a longitudinal sectional view thereof;
Figure 2 is a plan view, Figure 3 is a perspective view,
FIG. 4 is a cross-sectional view during garbage removal work. 2... Plate cylinder, 4... Square stay, 5... Holder,
5c...hole, 7...slide bar, 11...wiper.

Claims (1)

[Scope of utility model registration request] A holder is fitted to a stay supported parallel to the axial direction of the plate cylinder so as to be reciprocally movable but not rotatable, and a slide bar is inserted into the hole of the holder so as to be freely advanced and retracted in the direction of distance from and near the plate surface of the plate cylinder. 1. A printing plate dust removal device for a rotary printing press, characterized in that the cross-sectional dimensions of the wiper at the tip of the slide bar are set to be smaller in width and thickness than the cross-sectional dimensions of the hole in the holder.