JPH0435172Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a holding mechanism for a form roller that deposits ink on the plate surface of a plate cylinder in an offset printing press.

The conventional foam roller holding mechanism was developed in 1986.
The one according to Publication No. -7478 is known. The form roller holding mechanism is formed by eccentrically forming the plate cylinder metal 21 that supports the plate cylinder cylinder 23, and rotates the plate cylinder metal 21 eccentrically by a gear mechanism to move the outer peripheral surface of the plate cylinder 23 forward and backward. Semi-arc-shaped cams 34, 35, 3 are pivotally supported on a cam base 32 which is rotatably mounted on the boss of the plate cylinder 21.
The contact pressure between the ink form roller 30 and the plate cylinder cylinder 23 is adjusted by moving the ink form roller 6 forward and backward using an adjustment bolt 40 to raise and lower a roller 41 provided at the tip of the roller holder 26 on which the ink form roller 30 is attached. ing.

In addition, the form roller holding mechanism includes a roller holder 26 rotatably mounted on a swing roller metal 25 that rotatably supports a swing roller 24, and a roller holder 26 that is slidable up and down on the lower end of the roller holder 26. Bearing 27 of ink form roller 30
The contact pressure between the inking roller and the swinging roller 24 is adjusted by swinging the bearing 27 using an adjustment bolt 28.

Therefore, it not only has a complicated structure and is difficult to maintain and inspect, but also uses an eccentric plate cylinder metal 21 and a gear mechanism, so there is a problem that it cannot be applied to small offset printing machines with limited space. It was hot.

Adjustment bolt 40 for further adjusting contact pressure
Since the adjusting bolt 28 is provided inside the frame, there is a problem that adjusting the contact pressure is difficult and takes time.

The present invention was devised to solve the above-mentioned problems, and has a simple structure, easy maintenance and inspection, and is applicable to small offset printing machines.
It is an object of the present invention to provide a form roller holding mechanism for an offset printing press that allows easy adjustment of the contact pressure of the form roller against a plate cylinder and a rolling roller.

The present invention will be explained in detail below based on the illustrated embodiments.

Since the proposed mechanism is provided symmetrically as shown in FIGS. 1 and 2 with the operating side and the non-operating side, the mechanism on one side will be described in detail.

As shown in Figures 1 to 3, the plate cylinder 2 and the rolling roller 3, which are rotatably supported between the frames 1 and 1', are maintained at appropriate intervals, and the upper form roller 4 and the lower foam roller 5
are respectively supported by brackets 6 and 7 which are located inside the frames 1 and 1' and rotatably supported by the frames 1 and 1', and are connected to the plate cylinder 2 in a spaced apart state. They are brought into contact with the rolling rollers 3, respectively.

Further, the brackets 6 and 7 are placed on the operation side and the non-operation side, respectively.

Further, the upper form roller 4 and the lower form roller 5 rotate on straight lines a and b connecting the respective centers of the rollers 4 and 5 and the center of the horizontal rolling roller 3 as rotational supports O and O', and the plate cylinder The brackets 6 and 7 are removably located on the straight lines a and b, and each bracket 6 and 7 is pivoted by pins 10 and 11 to an arm 8 and 9 that rotates about the other rotational fulcrum. , 7's rotational fulcrum O,
A spring 16 is tensioned at a position approximately symmetrical to O' to apply contact pressure between the upper and lower form rollers 4 and 5 to the plate cylinder 2, and a spring 16 is provided that protrudes from both brackets 6 and 7. protrusions 12, 13
are brought into contact with the eccentric stud bolts 14, 15 protruding from the frames 1, 1', respectively, to counteract the tension of the spring 16, and the eccentric stud bolts 14, 1
By rotating the plate cylinder 5, the contact pressure against the plate cylinder 2 can be adjusted.

The rotational fulcrum P of the arms 8 and 9 is a fixed shaft 1 of the frames 1 and 1' that is installed on a straight line C that bisects the angle with the straight lines a and b.
The arms 8 and 9 are arranged in a substantially V-shape from the front so as to sandwich the rollover roller shaft 18, and by rotating around the rotational fulcrum P, the arms 8 and 9 prevent rollovers. The contact pressure of the foam rollers 4 and 5 with respect to the roller 3 can be adjusted.

A spring 19 is tensioned at the other end of each of the arms 8, 9, and the spring force applies contact pressure between the upper and lower form rollers 4, 5 to the rolling roller 3. In addition, eccentric stud bolts 20 provided on the frames 1 and 1',
The other ends of arms 8 and 9 are brought into contact with 21 to oppose the tension of spring 19, and the contact pressure can be adjusted by rotating eccentric stud bolts 20 and 21.

Furthermore, the brackets 6 and 7 are provided with protrusions 22 and 23 that protrude toward the plate cylinder 2 side and are brought into contact with a bearing 24.

The bearing 24 is pivotally supported by an arm 25 rotatably provided on the frame 1 about a rotational fulcrum Q. When the arm 25 is rotated by a drive device (not shown), the bearing 24 is rotated. By pressing the protrusions 22 and 23 toward the rolling roller 3, each bracket 6 and 7
are rotated in symmetrical directions about the pins 10 and 11, and the form rollers 4 and 5 are separated from the plate cylinder 2 and are in a non-contact state, and by releasing the pressing force of the bearing 24, the form rollers 4 and 5 are 5 is configured to be in contact with the plate cylinder 2.

Since the form roller holding mechanism in the offset printing press according to the present invention is constructed as described above, the structure is simple, and maintenance and inspection are not only easy, but also the brackets 6, 7 and arms 8, 9 can be compactly assembled. Therefore, it can also be applied to small offset printing machines. Furthermore, the contact pressure of the form rollers 4, 5 against the plate cylinder 2 and rolling roller 3 can be adjusted simply by rotating the eccentric stud bolts 14, 15 and eccentric stud bolts 20, 21 formed on the frames 1, 1'. Pressure adjustment operation is extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a front view on the operation side of a holding mechanism for a form roller in an offset printing press according to the present invention;
FIG. 2 is a front view of the same mechanism on the side opposite to the operation side, and FIG. 3 is a developed longitudinal sectional plan view of the same mechanism. 2... Plate cylinder, 3... Rolling roller, 4... Upper form roller, 5... Lower form roller, 6, 7... Bracket, 8, 9... Arm,
16, 19... Spring, a... Straight line connecting the center of the upper form roller and the rolling roller, b
...A straight line connecting the centers of the lower form roller and the rolling roller, c...A straight line passing between the upper and lower form rollers, O, O'...The rotational fulcrum of the bracket, P...The rotational fulcrum of the arm.

Claims (1)

[Scope of utility model registration request] In a form roller holding mechanism in an offset printing machine, which is provided with an upper form roller 4 and a lower form roller 5, the axial distance of which can be adjusted with respect to the cylinder 2 and the rolling roller 3, the upper form roller 4 and the lower form roller 5
The rotation supports 0 and 0' of the brackets 6 and 7 supporting the form rollers 4 and 5 are formed on straight lines a and b connecting the axis of the roller and the axis of the rolling roller 3,
Arms 8 and 9 are pivotally supported on the rotational supports 0 and 0', and
The rotation fulcrum P of the arms 8 and 9 is formed on the straight line c that bisects the angle formed by the straight lines a and b, and
Springs 16 and 19 are tensioned between the brackets 6 and 7 and between the arms 8 and 9 to ensure the contact pressure of the form rollers 4 and 5 against the plate cylinder 2 and the rolling roller 3. ，
1' includes eccentric stud bolts 14 and 15 that abut against the protrusions 12 and 13 of the brackets 6 and 7 against the tension of the springs 16 and 19, and an eccentric stud bolt that abuts one end of the arms 8 and 9. 2
1. A form roller holding mechanism for an offset printing press, characterized in that rollers 0 and 21 are rotatably formed.