JPH07299898A - Correcting device for width register in multicolor rotary press - Google Patents

Abstract

PURPOSE:To provide a correcting device for width register in a multicolor rotary press in which out of register is put in an allowable range by providing a register pin for positioning a plate fitted to a split plate cylinder, so that the register pin is freely moved in the cross direction of the split plate cylinder. CONSTITUTION:In the case of moving a register pin 11a to the outside in the cross direction to correct out of register which is caused by elongation in the cross direction of a shell 7a, fixation of the register pin 11a set in the regular position through a positioning pin 21 is released by loosing a bolt 24. A regulation axis is turned and a balance bar 20a is moved to both side ends in the cross direction in accordance with elongation in the cross direction of a web and again fixed by the bolt 24. Further, the pin parts 28 of the register pins 11a, 11b are fitted into the notches for register of the holding side 16 and the holding bottom side of a plate 9. The position in the cross direction of the plate 9 is fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a multicolor rotary press having a multi-color rotary press in which a plurality of printing units each having a divided plate cylinder for mounting four plates in the width direction are mounted. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, a printing unit 1a, 1 for printing on both sides of paper at a contact portion of a pair of blanket cylinders 6, 6
b, 2a, 2b are stacked in a plurality of stages (FIG. 4), and when printing is performed on a web surface by a rotary press that performs multicolor printing, the printing pressure between the pair of blanket cylinders 1a, 1b, 2a, 2b, the longitudinal and lateral directions of the web. The strength of the web (longitudinal direction of the web, the direction perpendicular to the fiber direction is horizontal), the water content of the paper, the expansion of the strength decrease of the paper due to the penetration of dampening water during offset printing, etc. Stretches in the web flow direction) and in the left-right direction (width direction). Depending on the method of making the web, the fibers of the web are generally aligned in the vertical direction, so the horizontal stretch of the web (the direction perpendicular to the vertical) may be around 1 mm. The gap is large.

By the way, since the elongation of the web in the vertical direction is slight, if the registration device of the existing plate cylinder (including the division plate cylinder 5) is used to correct the deviation between the colors in accordance with the elongation in the vertical direction, The color registration is within the allowable range. However, the correction of the lateral color misregistration due to the elongation in the width direction of the web (hereinafter referred to as the width direction) is large because the misregistration is large as described above. The device cannot correct the misalignment between colors. Therefore, in order to prevent color shift due to paper stretch in the width direction, a plurality of air nozzles (FIG. 4) arranged on both sides of the web or members having a pressing surface are provided on the web entry side of the pair of blanket cylinders. The width direction correction device is provided to reduce the width of the web by the air pressure acting on both sides of the web and the pressing of the member.

[0004]

Conventionally, the above-described width register correcting device is provided on the web entrance side of the pair of blanket cylinders of each printing unit to correct the misregistration between the colors due to the elongation of the web in the width direction. However, in this case, the width register correcting device is installed to further narrow the narrow gate-shaped space provided inside the printing unit through which the web passes, and the ink roll can be taken in this gate-shaped space. However, there is a problem that the work such as adjustment is difficult and the cost is increased. According to the present invention, a width register correcting device is provided by combining a plurality of printing units each having a divided plate cylinder in which four plates which do not need to be provided on the web entry side of a pair of blanket cylinders of the printing unit are arranged side by side in the width direction. An object of the present invention is to provide a width register correcting device for a multicolor printing press capable of solving the above-mentioned conventional problems.

[0005]

For this reason, the present invention provides a multi-color rotary printing press having a plurality of printing units, each of which has a divided plate cylinder in which four plates are arranged side by side in the width direction, and these divided plate cylinders (shells) are stacked. Alternatively, the resister pin for positioning the plate mounted on the divided plate cylinder main body can be moved in the width direction of the divided plate cylinder, which is a means for solving the problem.

[0006]

When a full width web having a total width of the four plates is printed by a divided plate cylinder in which four plates are sequentially arranged so as to contact each other in the width direction, when the full width web is printed in the width direction, Elongation occurs in the widthwise direction in the plates mounted on both sides of the split plate cylinder, while the elongation in the widthwise direction in the two central plates is slight (Fig. 5). On the other hand, the divided plate cylinder has a left shell and a right divided plate cylinder main body to which four plates are attached one by one, and each shell and the divided plate cylinder main body have a vertical direction and a horizontal direction (width direction).
A registration correcting device is provided. Therefore 2 in the center
The web widthwise elongation of the plate portion can be corrected by the widthwise register correcting device of the two divided plate cylinder main bodies (or shells). It cannot be corrected by the register correction device. In the present invention,
The register pin that determines the plate mounting position in the width direction of the shell (or divided plate cylinder body) can be moved in the width direction (axial direction of the plate cylinder). It is possible to correct the misregistration due to the elongation of the web in the width direction within an allowable range by mounting the plate by shifting it from the regular mounting position.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIG. 1 shows a split plate cylinder provided with movable register pins which is a width register correcting device for a multicolor printing press according to the embodiment of the present invention. 2 and 3 show fixed and movable register pins and are sectional views taken along line X-X of FIG. Further, FIG. 4 shows an example of a multi-color rotary press that stacks four sets of printing units each having a divided plate cylinder in a plurality of stages to simultaneously perform four-color printing on both sides of the web. In FIG. 4, divided plate cylinders 5 and 5 having an inking device 3 and a dampening device 4 and a pair of blanket cylinders 6 and 6 which are respectively brought into contact with and separated from each other Double sided arch type printing unit 1a,
1b and double-sided mark reverse arch type printing units 2a, 2b,
As shown in FIG. 4, the printing units, which are alternately stacked, are provided in the multicolor rotary printing press.

The web (paper) extends from the contact point P of the pair of blanket cylinders 6, 6 of the printing unit 1a at the lowermost position to the pair of blanket cylinders 6, 6 of the uppermost printing unit 2b.
Until the contact point S of the blanket cylinders 6 and 6 is passed.
When printed at the contact points P, Q, R, and S, the web is mainly because the dampening water supplied from each dampening device 4 to the plate cylinder 5 is absorbed by the web through the blanket cylinder 6. , Extends and expands vertically and horizontally (width). At this time, the elongation of the web in the vertical direction is small, but the elongation in the width direction is considerably large (about 1 mm). As shown in FIG. 5, the divided plate cylinder 5 is provided with a shell 7 for sequentially mounting plates 9 in the width direction from the left side of the plate cylinder 5 and a divided plate cylinder main body 8. 7 and divided plate cylinder main body 8) are mounted with plates 9a, 9b, 9c and 9d of the same width, respectively, and as shown in FIG. 1, the shell 7a and divided plate cylinder main body 8a are respectively provided with movable register pins 11a and fixed pins. The register pin 11b is attached.

As shown in FIGS. 1 and 2, the shell 7a and the plate cylinder main body 8a are provided with a gap 12 and holes 13a, 13b and a groove 13c in the width direction for inserting the plate when the plate is mounted.
Is provided, and a grip portion 14 and a grip bottom portion 15 are formed by the outer peripheral surfaces of the divided plate cylinders 5 and 5 and the cave 13. Then, the grip side 16 of the plate 9 is fitted into the grip portion 14, and the tension bar 19 fitted so as to be rotatable in the hole 13a is rotated to bend the spring plate 18, and is hooked on the grip end side 17 of the plate 9. The plate 9 is fixed to the divided plate cylinders 5 and 5. The balance bars 20a of the split plate cylinders 5 and 5 are designed to be movable in the width direction, and the balance bars 20b are fixed to the holes 1
It is attached to 3b. Further, the register pin 11b has a long groove 22 for a bolt so that it can move along the guide 23, and the position in the width direction is determined by the positioning pin 21,
It is fixed to the groove 13c with a bolt 24. On the other hand, the movable register pin 11a is fixed to a balance bar 20a mounted so as to be movable in the width direction of the split plate cylinder 5 with a screw 26 at the shaft end of the adjusting shaft 25 as shown in FIG. The guide 27 is fitted into the fork portion 27a.

The register pin 11a is the register pin 1
Like 1b, it has a long groove 22 for a bolt, moves along a guide 23, is positioned by a positioning pin 21, and is fixed to a bolt 24. On the other hand, in order to move the register pin 11a outward (arrow) in the width direction in order to correct the misregistration due to the expansion of the shell 7 in the width direction,
The fixing of the register pin 11a which is set at the regular position by the positioning pin 21 is loosened and loosened by loosening the bolt 24, and the adjusting shaft 25 is rotated to move the balance bar 20a in the direction of the arrow (toward both ends in the width direction). , The web is moved in accordance with the widthwise extension of the web, and is fixed again with the bolt 24. Further, the pin portions 28 of the register pins 11a and 11b are provided on the holding side 1 of the plate 9.
6 and the register notch 17 on the gripping edge side 17 (FIG. 3), and the position of the plate 9 in the width direction is determined.

[0011]

As described above in detail, according to the width register correcting device of the multi-color rotary printing press of the present invention, the register pins at both ends of the divided plate cylinder for mounting four plates in the width direction are By moving the web in the direction, even if the web is greatly stretched in the width direction and the register is misaligned, the register misalignment can be kept within the allowable range.

[Brief description of drawings]

FIG. 1 is a plan view showing a lateral register correcting device of a multi-color rotary printing press according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line X-X in FIG.

FIG. 3 is an enlarged view of a Y portion of FIG.

FIG. 4 is a side view of a multicolor rotary printing press in which four printing units each having a divided plate cylinder are stacked.

5 is a side view showing an enlarged fan-out (stretching of the web) of the split plate cylinder in FIG. 1. FIG.

[Explanation of symbols]

 1a 1b 2a 2b printing unit 3 inking device 4 dampening device 5 divided plate cylinder 6 blanket cylinder 7 shell 8 divided plate cylinder body 9a 9b 9c 9d plate 11a movable register pin 11b fixed register pin 12 gap 13 cave 13a 13b hole 13c Groove 14 Gripping portion 15 Gripping edge 16 Gripping edge of plate 17 Gripping edge of plate 18 Spring plate 19 Tension bar 20a Moving balance bar 20b Fixed balance bar 21 Positioning pin 22 Long groove 23 Guide 24 Bolt 25 Adjusting shaft 26 Screw 27 Guide 28 Pin part

Claims (1)

[Claims] 1. A multicolor printing press having a plurality of printing units each having a divided plate cylinder for arranging four plates arranged side by side in the width direction, and mounted on these divided plate cylinders (shells or divided plate cylinder bodies). A register register correcting device for a multi-color rotary press, wherein a registering pin for positioning a plate can be moved in a width direction of the divided plate cylinder.