JPS63154349A - Plate cylinder phase adjuster in rotary press - Google Patents

Abstract

PURPOSE:To adjust the rotating phase of a plate cylinder rapidly and easily as well as steplessly and accurately, by a method wherein a plate cylinder cone is made detachable to a plate cylinder and a clutch means is provided between a plate cylinder cone shaft and a drive source to enable the adjustment of the rotating phase of the plate cylinder cone shaft with respect to the drive source. CONSTITUTION:A flexible shaft joint 25 consists of a driven ring 25a fitted by spline to a plate cylinder cone shaft 7, a drive ring 25c loosly fitted to the plate cylinder cone shaft 7, and an elastic cylinder 25b coupling the aforesaid rings. A pair of circular arms 22, 23 holding the drive ring 25c of the flexible joint 25 lock the drive ring 25c by being fastened by a clamping bolt 24 and release the drive ring 25c by loosening the clamping bolt 24. Even if a disk 19 and the drive ring 25c are offset in concentricity when the drive ring 25c is held strong by the arms 22, 23 by fastening the clamping bolt 24, the offset amount is absorbed in the elastic ring 25b. Therefore, the possibility that the driven ring 25a affects the plate cylinder cone shaft 7 with an excessive eccentric force is eliminated.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a device for adjusting the rotational phase of a plate cylinder of a rotary printing press, and is particularly suitable for adjusting the rotational phase of a plate cylinder of a gravure multicolor printing press. The present invention relates to an adjustment device.

[Prior art]

FIG. 3 is a sectional view showing a conventional plate cylinder drive mechanism.

10 is a plate cylinder of a rotary printing press, and includes a pair of plate cylinder cones 8a.

It is supported by 8b. The left plate cylinder cone 8b is just a support member (rotatable), but the right plate cylinder cone 8a
is a driving member and a member for attaching and detaching the plate cylinder IO.

The plate cylinder cone shaft 7, to which the plate cylinder cone 8a is fixed, transmits the driving force for rotating the plate cylinder 10, so that the plate cylinder cone shaft 7 has a receiving gear 3a, an original bevel gear (indicated by a pinch line) 3,
They are connected via b. Further, in order to make the plate cylinder lO removable, it has a structure in which it can be moved forward and backward in the left and right directions in the figure by an air cylinder 15.

This conventional device is configured with a transmission mechanism as described below to enable rotational drive of the plate cylinder cone shaft 7 and movement back and forth in the axial direction.

The gear shaft 5 of the receiving gear 3a is rotatably supported by a bearing 4 on the gear box 2, and does not slide in the axial direction.

The receiving gear shaft 5 is spline-coupled to a spline shaft portion 7a of a plate cylinder cone shaft 7 via a shaft joint 6 having a spline hole.

On the other hand, the cylindrical holder 14 is fixed to the frame 13 through the frame 13, and supports the cylindrical housing 12 so as to be slidable in the axial direction. Therefore, this housing 12 is attached to the bearing 11.
The sleeve 18 rotatably supports the plate cylinder cone shaft 7 through the sleeves a and llb, and has a ring-shaped groove fixed to its end.

The expansion and contraction of the air cylinder 15 rotates a lever 17 that is pivotally supported by a pin 16, and moves the plate cylinder cone shaft 7 back and forth in the axial direction via the sleeve 18.

By retracting the plate cylinder cone shaft 7 (to the right in the figure), the plate cylinder cone 8. When it moves to the right, it separates from the plate cylinder lO, making it possible to remove and replace it.

When the plate cylinder cone 8a moves to the left as the plate cylinder cone shaft 7 moves forward (to the left in the figure), it engages with and supports the plate cylinder 10. A key 9 is interposed to prevent the plate cylinder cone 8a and the plate cylinder 10 from shifting in the rotational direction.

[Problem that the invention seeks to solve]

Regarding rotary printing by rotating the above-mentioned plate cylinder 10,
For example, to perform gravure printing in N colors, the components shown in FIG. 3 are installed in NMi, and N horizontal shafts 1 are arranged concentrically and connected by shaft couplings (not shown).

Although the N plate cylinders 10 are rotated at a constant speed as described above, the rotational phase of each of the N plate cylinders 10 must be adjusted in order to perform printing without color misregistration.

In the apparatus according to the prior art described above (FIG. 3), the plate cylinder 10
In order to adjust the phase of

(a) The pattern on the plate cylinder 10 is moved in the rotational direction with respect to the key 9. This method requires a high degree of skill and a large amount of time.

It takes effort.

(b) Changing the meshing between the receiving gear 3a and the original bevel gear 3b (shifting the teeth). This method also requires a great deal of time and effort, and can only be adjusted stepwise for each pitch interval of the teeth, so fine adjustment is not possible.

(c) The installation of the shaft joints (not shown) that interconnect the N horizontal shafts 1 arranged concentrically is shifted. According to this method, when the phases of the two horizontal axes 1 are adjusted, the remaining N-
Since the phases of the two horizontal axes 1 will be out of order, it will take a very long time, although it is not impossible.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a device that can quickly, easily, and steplessly adjust the rotational phase of a plate cylinder.

[Means for solving problems]

The present invention, created to achieve the above object, supports the plate cylinder cone shaft that drives the plate cylinder of a rotary printing press via the plate cylinder cone and key so as to be slidable in the axial direction, and The plate cylinder cone is applied to a rotary printing press having a plate cylinder exchange mechanism which is provided with an operating means for reciprocating in the direction so that the plate cylinder cone can be engaged with and detached from the plate cylinder, and the plate cylinder cone shaft and the drive source are connected to each other. The present invention is characterized in that a clutch means is provided between the two, so that the rotational phase of the plate cylinder cone shaft relative to the drive source can be adjusted.

[For production]

According to the above configuration, the phase adjustment is completed when the clutch is set to the "disengaged" state to allow the plate cylinder to rotate freely, and the clutch is set to the "on" state after the plate cylinder is rotated to an arbitrary rotational position. . When N plate cylinders are provided, even if the phase of any one plate cylinder is adjusted, the phases of the remaining N-1 plate cylinders are not affected.

〔Example〕

FIG. 1 shows one embodiment of the present invention, and FIG. 2 is a view in the direction of arrow A.

This embodiment is an improvement by applying the present invention to the conventional example shown in FIG. It is a part.

Next, points different from the conventional example described above will be explained.

Part 0 shown surrounded by a chain line is a clutch means interposed between the plate cylinder cone shaft 7 and the bevel gear shaft 5.

The configuration of the clutch means C of this example is as follows.

A ring-shaped disk 19 is fixed to the left end of the bevel gear shaft 5, and a pair of arc-shaped arms 22 and 23 are attached to this disk 19 with hinge pins 20.

The flexible shaft joint 25 of this example shown in FIG. 1 connects a driven ring 25a spline-fitted to the plate cylinder cone shaft 7 and a drive ring 25c loosely fitted to the plate cylinder cone shaft 7. It consists of an elastic tube 25b.

The pair of arcuate arms 22 and 23 hold the drive ring 25c of the flexible joint 25, restrain the drive ring 25c when tightened with the tightening bolt 24 (FIG. 2), and release the drive ring when the tightening bolt 24 is loosened. Release 25c.

When the tightening bolt 24 is tightened and the drive ring 25c is strongly held between the arms 22.23, even if the concentricity between the disk 19 and the drive ring 25c is out of order, this deviation will be caused by the elastic ring 25c.
5b, there is no risk of the driven ring 25a exerting an excessive eccentric force on the plate cylinder cone shaft 7.

〔Effect of the invention〕

As described in detail above, when the present invention is applied, it is possible to quickly and easily adjust the rotational phase of the plate cylinder with precision in a stepless manner, which is an excellent practical effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a view taken along arrow A. FIG. 1 is a sectional view of a conventional example. 1...° horizontal axis, 3a... recipient gear, 3b... principal gear, 7... plate cylinder cone shaft, 8a, 8b... plate cylinder cone, 10... plate cylinder, 25 ... Flexible shaft coupling, C clutch means.

Claims (1)

[Claims] A plate cylinder cone shaft that drives the plate cylinder of a rotary printing press via a plate cylinder cone and a key is slidably supported in the axial direction, and an operating means is provided for reciprocating the plate cylinder in the axial direction. In a rotary printing press having a plate cylinder exchange mechanism in which a cone can be connected to and removed from a plate cylinder, a clutch means is provided between the plate cylinder cone shaft and a drive source, and a clutch means is provided between the plate cylinder cone shaft and a drive source to control the plate cylinder cone shaft relative to the drive source. 1. A plate cylinder phase adjustment device for a rotary printing press, characterized in that it is configured to be able to adjust the rotational phase.