JPH10119237A - Register adjuster for plate cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a register adjuster capable of allowing transfer to a frame of a plate cylinder itself. SOLUTION: In the register adjuster for a plate cylinder, a drive gear 4 having helical gear is bonded, in an imposible rotation around a cylinder shaft 1/possible sliding thereto manner, to an end part of the cylinder shaft 1 to a driving side of the plate cylinder; the driving gear 4 is engaged with a driving gear of the blanket cylinder having the same helical gear; a first crank arm 12 abuts against the end part of the cylinder shaft 1 so as to add thrust in its axial direction to the end part, and pushed with a first thrust means; a second crank arm 13 abuts against a side part of the driving gear 4 so as to add thrust in the axial direction of the plate cylinder, and pushed with a second thrust means 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-fed printing press,
In particular, the present invention relates to a register adjusting device for a plate cylinder that corrects a register shift caused by an incorrect plate cylinder position.

[0002]

BACKGROUND OF THE INVENTION In a multicolor printing sheet-fed printing press, printing plates are wound around plate cylinders of a number corresponding to the number of colors, and printing is performed in the order of each color. At this time, unless each color is sequentially printed at the correct position on one sheet, a so-called misregistration occurs, and good print quality cannot be obtained.

[0003] To get the right idea for each color,
A cross-shaped mark commonly called a register mark is printed on the margin of the sheet. Then, the printing positions of the register marks for each color are measured, and if a misregistration amount is found for each color, it is determined that there is an incorrect position of the plate cylinder or the like corresponding to the misregistration amount, and the plate fork or the printing plate is determined. Is performed.

Whether the plate cylinder corresponding to each color or the printing plate on the outer periphery of the plate cylinder should be adjusted in accordance with the amount of displacement should be examined from various viewpoints. The technique for register adjustment itself is related to the technique for register adjustment of a printing plate, although the adjustable amount is small, but the configuration of the apparatus can be simplified.

[0005] Further, when the printing misregistration is classified, there are a parallel misalignment in which the sheet is misaligned in the up / down direction and the left / right direction, and a distortion obtained by combining the misalignment in the left / right direction with the misalignment in the up / down direction. The present invention is directed to eliminating parallel misalignment.

[0006]

2. Description of the Related Art Japanese Patent Laying-Open No. 3-23944 discloses a register adjusting device as shown in FIG.
That is, the bearing (1) is mounted on the shaft (102) of the plate cylinder (101).
03), a helical drive gear (104) mounted on a bearing pin (106) fixed to the frame (105) of the printing press. ) And this gear (107)
Is non-rotatably coupled to a spur gear (108). The spur gear (108) is connected to the shaft (1).
02) is driving a gear (109) having a spur tooth, which is non-rotatably mounted at 02).

The plate cylinder (101) has a spindle (110).
The register can be moved in the axial direction of the seat, whereby the registration of the seat in the left-right direction is adjusted. on the other hand,
The spur gear (108) and the helical gear (107)
Bearing pin (106) by another spindle (111)
In the axial direction. At this time, the helical gear (10
7) is rotated, and this rotation is applied to the gears (108), (10).
9) to the plate cylinder (101) via the plate cylinder (10).
1) is also rotated. Thus, the register adjustment in the vertical direction of the sheet is performed.

[0008]

In order to correct the above-mentioned distortion of the printing position, the plate cylinder itself is twisted (cocked), or the bearer touch between the plate cylinder and the blanket cylinder on the side of the cylinder is used for tailoring. When the printing cylinder is changed for adjustment, it is necessary to move the plate cylinder itself with respect to the frame (the position of the cylinder shaft itself is moved by an eccentric bearing or the like) when cleaning the printing cylinder.

However, according to the above-mentioned prior art, the gears (107), (10) constituting the register adjusting device are used.
Since the members such as 8) and the spindles (110) and (111) are essentially fixed with respect to the frame (105), the movement of the plate cylinder (101) is completely lost. Further, the adjustment amount of the plate cylinder (101) in the axial direction / rotational direction is unclear, the reproducibility is poor, and an unreasonable load is applied to a specific member (the combined body of the gears (107) and (108)). There is a problem.

[0010] The present invention has been made in view of the above problems,
The purpose of the present invention is to provide an advanced register adjustment device for a plate cylinder, the purpose of which is to allow the plate cylinder to move regardless of the existence of the device, to make the configuration of the device easy, and to make the adjustment work easy. And what to do.

[0011]

According to the present invention, there is provided a register adjusting apparatus for a plate cylinder according to the present invention, which has a helical tooth at an end of a drum shaft (1) on a driving side of the plate cylinder. Drive gear (4)
Are non-rotatably / slidably connected to the barrel shaft (1), the drive gear (4) meshing with the drive gear (8) of the blanket cylinder, also having helical teeth,
The first crank arm (12) abuts against the end of the barrel shaft (1) so as to apply thrust in the axial direction thereof, and is pushed by the first thrust means (16). And a second crank arm (13)
Abuts against the side of the drive gear (4) so as to apply thrust in the axial direction of the plate cylinder, and is pushed by the second thrust means (19).

[0012]

When the first crank arm (12) is rotated by the first thrust means (16), the position of the plate cylinder is adjusted in the axial direction, and as a result, the printing result is determined by the sheet. Register adjustment is made in the left-right direction. At this time, since the drive gear (4) is slidable with respect to the trunk shaft (1), it does not receive any force.

When the second crank arm (13) is rotated by the second thrust means (19),
The drive gear (4) is pressed in the axial direction of the plate cylinder. At this time, since both the drive gear (4) and the drive gear (8) of the blanket cylinder are helical, they are rotated together with the plate cylinder. . As a result, with respect to the print result, register adjustment in the top and bottom direction of the sheet is performed. At this time, although the drive gear (4) is rotated, it is slidable in the axial direction, so that the position of the plate cylinder in the axial direction does not change.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a plan sectional view showing an embodiment of a register adjusting device for a plate cylinder according to the present invention, FIG. 2 is a side sectional view seen from the direction of arrow II in FIG. 1, and FIG.
FIG. 3 is a front view as viewed from the direction of arrow III.

Although only the cylinder axis (1) of the plate cylinder to be registered is typically illustrated, in a general printing press, a plate cylinder, a blanket cylinder, an impression cylinder, It is known that a printing cylinder is constituted by a sheet conveying cylinder, and various rollers constituting an inking unit and a dampening unit are additionally provided.

The cylinder shaft (1) of the plate cylinder is rotatably supported by a pair of frames (2) on both sides of the printing press via bearings (3). The bearing (3) may be an ordinary flat bearing. However, if the plate cylinder itself is moved relative to the frame (2) as described above, as shown in the drawing, Eccentric bearings will be used. Techniques for moving the plate cylinder supported by the eccentric bearing as required are already well known.

A drive gear (4) having helical teeth is mounted on the end of the barrel shaft (2). This drive gear (4)
Receives a torque from a drive motor of a printing press (not shown) via various gear groups and rotates the plate cylinder in a timely manner. The drive gear (4) is made unrotatable with respect to the trunk shaft (1) by a key (6) engaged in the key groove (5), and is allowed to slide in the trunk shaft direction. Further, it is constantly urged in the side direction by a spring member (7) stretched between the body shaft (1).

The drive gear (4) of the plate cylinder meshes with the drive gear (8) of the blanket cylinder which is in contact with the plate cylinder.
This drive gear (8) also has helical teeth. As described above, a technique for finely rotating the plate cylinder by the torsion angle of the drive gears (4) and (8) meshing between the helical teeth to adjust the register in the vertical direction of the sheet is disclosed in, for example, Japanese Patent Application Laid-open No.
It is already publicly known, for example, from Japanese Patent Publication No. 126927.

The essential features of the present invention can be found in the following configurations. That is, the arm shaft (10) is attached to the mounting base (9) fixed to the frame (2) by the shaft support member (1).
Attached via 1). This arm axis (1
0) are the first and second crank arms (12), (1).
3) is a common rotation center. Of course, the center of rotation of both crank arms (12) and (13) may be provided individually, but by having a common center as shown, space saving is achieved and a smart design is achieved.

One end of the first crank arm (12)
As shown in FIG. 2, it is in contact with the thrust plate (15) of the trunk shaft (1) via the roller (14) at the end,
When the crank arm (12) is rotated, thrust is applied in the axial direction of the trunk shaft (1). The other end of the first crank arm (12) is in contact with the tip of a first thrust means (16) screwed to the mounting base (9). Therefore, the first thrust means (16) is provided in FIG.
Of the first crank arm (1
2) is rotated about the arm axis (10). Since the first thrust means (16) is also a kind of adjustment dial, it is possible to easily mark the amount of screwing.

Also, the second crank arm (13)
As shown in FIG. 2, through the intermediate roller (17), the thrust plate (18) on the side of the drive gear (4)
When the crank arm (13) is rotated about the arm shaft (10), the spring member (7)
Thrust is applied in the axial direction of the barrel shaft (1) against the elastic force of the body shaft (1). In addition, the second crank arm (1
Similarly to the above, the tip of the second thrust means (19) screwed to the mounting base (9) is in contact with the same, and the second thrust means (19) is screwed forward. Then, the second crank arm is rotated about the arm axis (10).

It should be noted that one end of each of the crank arms (12) and (13) is not directly connected to the plate cylinder and the drive gear (4), but to each of the rollers (14). , (17) and thrust plate (15), (1
8). Therefore,
Since the register adjusting device is provided as in the prior art, the movement of the plate cylinder is not hindered, and the shaft center can be freely moved if necessary. (14), (17) and thrust plate (15),
(18) can be kept in contact. In other words, the two crank arms (12) and (13) and the plate cylinder and the drive gear (4) have a so-called indirect and non-interfering relationship, though transmitting force.

Next, the operation will be described. First, in order to adjust the position of the plate cylinder in the axial direction, the first thrust means (16) is screwed with respect to the mounting base (9). Then, the first crank arm (12) is rotated about the arm shaft (10), and the roller (14) moves the barrel shaft (1) and thus the plate cylinder in the axial direction via the thrust plate (15). Let it. Such axial movement of the plate cylinder results in lateral registration of the sheet with respect to the printing result. In this case, the drive gear (4) of the plate cylinder
Keeps the original position while meshing with the drive gear (8) of the blanket cylinder and the helical teeth. The drive gear (4)
Is slidable with respect to the trunk shaft (1).

Further, in order to adjust the position of the plate cylinder with respect to its rotational direction, the second thrust means (19) is screwed with respect to the mounting base (9). As a result, the second crank arm (13) is rotated about the arm shaft (10), and the intermediate roller (17) moves the thrust plate (18) on the side of the drive gear (4) in the axial direction. Press. Since both the pressed drive gear (4) and the drive gear (8) of the blanket cylinder meshing therewith are helical, the drive gear is driven by the action of the helical torsion angle, as already known. (4) Consequently, the plate cylinder is rotated. Such rotation of the plate cylinder results in a top-to-bottom registration of the sheet with respect to the printing result. At this time, although the drive gear (4) is rotated, it has no effect in the axial direction, and therefore, the axial position of the plate cylinder does not change.

[0025]

According to the register adjusting device for a plate cylinder according to the present invention, since the plate cylinder and the device have a non-interfering relationship, the plate cylinder can be freely moved, and the structure of the device can be improved. There is no unreasonable load or the like, and the adjustment operation itself is simple, the reproducibility is good, and it is a very excellent register adjustment technique.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing an embodiment of a register adjusting device for a plate cylinder according to the present invention.

FIG. 2 is a side sectional view as seen from the direction of arrow II in FIG.

FIG. 3 is a front view similarly viewed from a direction III in FIG. 1;

FIG. 4 is a side sectional view of the prior art.

[Explanation of symbols]

 Reference Signs List 1 trunk shaft 4 drive gear 6 key 7 spring member 8 drive gear 10 arm shaft 12 first crank arm 13 second crank arm 14 roller 15 thrust plate 16 first thrust means 17 roller 18 thrust plate 19 second thrust means

Claims (1)

[Claims] A drive gear (4) having helical teeth is connected to an end of a drum shaft (1) on the drive side of a plate cylinder so as to be non-rotatable / slidable with respect to the drum shaft (1). This drive gear (4) is in mesh with the drive gear (8) of the blanket cylinder, also having helical teeth, and the first crank arm (12) is connected to the end of the cylinder shaft (1) with respect to its end. The first thrust means (16), and the second crank arm (13) is connected to the drive gear (4). A register adjusting device for the plate cylinder which is brought into contact with the portion so as to apply a thrust in the axial direction of the plate cylinder and is pushed by the second thrust means (19).