JPH02215532A - Offset press with adjusting device of registering - Google Patents

Abstract

PURPOSE:To easily secure large adjustment of the registering, by pivotally fixing an upper frame at the driving side to a lower frame by an axis parallel to a line connecting the center of a rubber cylinder and the center of a pressure cylinder and moving an upper frame at the operating side in a direction orthogonal to said connecting line. CONSTITUTION:Unit side frames 8,8' are divided into upper fame 8A,8A' and lower frames 8B,8B' between a rubber cylinder 2 and a pressure cylinder 3. A sliding face S is defined at the dividing part, which is orthogonal to a line X-Y connecting the center X of the rubber cylinder 2 with the center Y of the pressure cylinder 3. In the frame 8A' at the driving side of a printing press, the upper frame 8A' in which an axial end of each of a form cylinder 1 and the rubber cylinder 2 are fitted is mounted in the lower frame 8B' in a turnable manner via a positioning pin 31 along the connecting line X-Y, so that the rubber cylinder 2 can be turned along the sliding face S.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an offset printing press with a register adjustment device.

(Prior Art) In an offset printing press, each time a plate is attached to a plate cylinder, it is necessary to adjust the curvature of the plate. For example, this is corrected by twisting one end of the plate cylinder with respect to the blanket cylinder. Such a register twist adjustment device is, for example,
As described in No. 1-19921, a double eccentric member is provided in the journal section on the operation side of the plate cylinder, and the plate cylinder is twisted by rotating the inner eccentric member with a worm and a segment worm wheel. has been done.

Problems to be Solved by the Present Invention> However, in the type in which the plate cylinder 1 and the blanket cylinder 2 are brought into bearer contact as shown in FIG. A change in bearer pressure occurs when adjusting the twist in step 1, making it unapplicable.Also, if the cylinder diameter is large, it is possible to increase the amount of eccentricity, but this is extremely difficult at the level of sheet-fed machines. . Furthermore, there is a drawback that the mechanism is complicated.

The present invention aims to solve the above-mentioned problems.

The purpose of this system is to enable register adjustment with a relatively simple structure without changing the bearer touch pressure of the plate cylinder against the blanket cylinder, and to increase the amount of adjustment. An object of the present invention is to provide an offset printing press with a register adjustment device capable of adjusting the register.

Means for Solving the Problems> An offset printing machine with a register adjustment device according to the present invention is an offset printing machine in which a plate cylinder 1, a blanket cylinder 2, and an impression cylinder 3 are successively arranged. A side frame 8 supporting the cylinder and impression cylinder at both ends thereof is mounted between the blanket cylinder 2 and impression cylinder 3 with upper frames 8A, 8A'' to which the printing cylinder and blanket cylinder are connected, and the impression cylinder is attached. The lower frames 8B and 8B' are divided into upper and lower parts, and a sliding surface S is formed in the divided part perpendicular to the line connecting the center X of the rubber cylinder and the center Y of the impression cylinder. 8
A' and the lower frame 8B' are pivotally connected by a shaft 31 parallel to a line connecting the center X of the rubber cylinder and the center Y of the impression cylinder, and the upper A drive mechanism for moving the frame 8A along the sliding surface S is provided.

The drive mechanism may be any mechanism as long as it can finely adjust the operation side upper frame 8A with a reciprocating stroke.

<Function> When the operating side upper frame 8A is slid by the drive mechanism, the operating side end of the blanket cylinder 2 moves relative to the impression cylinder 3 in a direction perpendicular to the X-Y line, and register twist adjustment is performed. Ru.

The plate cylinder 1 and the blanket cylinder 2 both have an upper frame 8A.

8A' and moves with the upper frame 8A, the bearer touch pressure between the plate cylinder and the blanket cylinder does not change.

Furthermore, since the frame is moved, register adjustment can be easily performed with a relatively simple configuration, and the amount of adjustment can be increased.

Furthermore, the machine operating efficiency can be increased by remote control.

<Embodiment> As shown in FIG. 7, an offset printing press to which the present invention is applied includes a plate cylinder 1, a blanket cylinder 2, and an impression cylinder 3 arranged in sequence from the top.
An inking roller 4 and a wet roller 5 are arranged on the upper and side parts of the plate cylinder 1, respectively, and a feed cylinder 6 is arranged on both sides of the impression cylinder 3, and these members are connected to an inking frame 7 and It is rotatably supported by a unit side frame 8.8'.

As shown in FIGS. 1 to 3, this unit side frame 8 (8') is attached between an upper frame 8A (8A') and a lower frame 8B (8B) between the rubber cylinder 2 and the impression cylinder 3.
'), and a sliding surface S perpendicular to the line X-Y connecting the center X of the blanket cylinder 2 and the center Y of the impression cylinder 3 is formed in the divided part. A plate cylinder 1 and a blanket cylinder 2 are connected to the upper frame 8A (8^°).

What is shown in FIGS. 1 and 2 is the case where the current cylinder arrangement shown in FIG. 7 is used, and the sliding surface S is formed diagonally.
What is shown in Figure 3 is the case where the barrel arrangement is changed and the rubber w42 and pressure 1
1if& are arranged on the same vertical line, and the horizontal dividing surface can be used as the sliding surface S.

Fig. 1 shows an example in which the sliding surfaces S are distributed on both sides of the line Both corners are cut out, and a sliding surface S perpendicular to the line X-Y is formed on the lower surface of the notch.The upper frame 8A is received on the lower block 10 via the upper block 9.

FIG. 2 shows an example in which there is only one sliding surface S, and the sliding surface S perpendicular to the line X-Y is continuously formed on the upper surface of the lower frame 8B.

As a drive mechanism for sliding the upper frame 8A relative to the lower frame 8B, for example, mechanisms shown in FIGS. 2, 4, and 5 can be used.

In FIG. 2, the wedge 30 is moved up and down by an actuating device (not shown), and the upper frame 8A is caused to slide on the sliding surface S by the force generated by the movement.

FIG. 4 shows a right-handed screw 11A and a left-handed screw IIB whose both ends are screwed into the lower frame 8B and the upper block 9 on the upper frame side.
Upper frame 8A by screw rod 11 having
It is a mechanism that moves the . The upper frame 8A can be moved together with the upper block 9 by rotating the screw rod 11 forward and backward by the motor 14 via the gears 12 and 13. 33 is a pivot pin that connects the upper frame 8A and the upper block 9. screw rod 1
It is preferable that the thread pitch of 1 is fine or coarse to increase the deceleration efficiency.

FIG. 5 shows an example using an eccentric pin 15.
is rotatably attached to the lower frame 8B via a bearing 16 and a support 17, and the eccentric portion is disposed in a recess of the upper frame 8A and abuts against a backing plate 18. By swinging a lever 19 attached to the eccentric pin 15 by a motor 21 via a screw 20, the eccentric pin 15 rotates in forward and reverse directions, and the upper frame 8A moves.

This drive mechanism is not limited to the above example, but the upper frame 8A
Any mechanism that allows for fine adjustment with a reciprocating stroke will suffice.

Note that this drive mechanism is provided only on the operation side frame of the printing press, and the printing press drive side frame 8A' has an upper frame 88'' into which the shaft ends of the plate cylinder 1 and blanket cylinder 2 are fitted. , is rotatably attached to the lower frame 8B' via a positioning pin 31 along the line X-Y connecting the center so that it can be rotated.

In addition, if the rotational transmission gear 32 between the blanket cylinder 2 and the impression cylinder 3 is crowned, etc., even if the blanket cylinder 2 is adjusted by twisting with respect to the impression cylinder 3, no problem will occur in the transmission.

Further, although the upper frame is brought into contact with the lower frame by its own gravity, it would be even more suitable if spring force or cylinder force is applied to bring the upper frame into contact with the lower frame.

<Effects of the Invention> As described above, in the offset printing press according to the present invention, both side frames are divided into upper and lower parts between the blanket cylinder and the impression cylinder, and among the divided upper frames, the upper frame on the driving side is pivoted to the lower frame with an axis parallel to the line connecting the center of the rubber cylinder and the center of the impression cylinder, and the upper frame on the operating side is moved in a direction perpendicular to the line connecting the center of the rubber cylinder and the center of the impression cylinder. Therefore, register adjustment can be performed without changing the bearer touch pressure between the plate cylinder and the blanket cylinder (i.e., without causing printing failures).

Further, since the divided upper frame is moved, register adjustment can be easily performed with a relatively simple configuration, and the amount of adjustment can be increased.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an offset printing machine according to the present invention, Fig. 2 is a schematic diagram showing a modification thereof, Fig. 3 is a schematic diagram showing another embodiment, and Fig. 4 is a screw type drive mechanism. Figure 5 is a front view and cross-sectional view showing the eccentric pin drive mechanism, Figure 6 is a plan sectional view taken along the line ■ in Figure 2, and Figure 7 is an offset printing machine. It is a schematic diagram. 1... plate cylinder, 2... rubber cylinder, 3... impression cylinder, 4...
- Inking roller, 5... Wet roller, 6... Feed cylinder, 7... Inking frame, 8... Unit side frame, 8A (8A')... Upper frame,
8B (8B')...Lower frame, 9...Upper block, 10...Lower block, 11...Screw rod, IIA...Right-hand thread, IIB...Left-hand thread, 12.
13... Gear, 14... Motor, 15... Eccentric pin, 16... Bearing, 17... Support, 18...
Backing plate, 19... Lever 20... Screw, 21...
Motor, 30... Wedge, 31... Positioning pin, 32... Rotating transmission gear.

Claims (1)

[Claims] (1) In an offset printing machine in which a plate cylinder, a blanket cylinder, and an impression cylinder are arranged in sequence, a side frame that supports the plate cylinder, blanket cylinder, and impression cylinder at both ends is placed between the blanket cylinder and the impression cylinder. , is divided vertically into an upper frame to which the plate cylinder and blanket cylinder are connected, and a lower frame to which the impression cylinder is attached, and the divided part is perpendicular to the line connecting the center of the blanket cylinder and the center of the impression cylinder. The upper frame and lower frame on the driving side are pivotally connected to each other by an axis parallel to the line connecting the center of the rubber cylinder and the center of the impression cylinder, and the upper frame and lower frame on the operating side are An offset printing press with a register twist adjustment device, characterized in that a drive mechanism is provided between which the upper frame is moved along the sliding surface.