JPH07132582A - Apparatus for correcting breadth register of multicolor print rotary press - Google Patents

Abstract

PURPOSE:To allow an erroneous color registering to be arranged in a tolerance, obviating slips between each ring and web, preventing taints from occurring by ink on the ring retransferred to the next design, and enabling the web breadth to be contracted in accordance with the extension in the web breadth direction. CONSTITUTION:While the web breadth directional position in each ring of a roller 11 is controlled in accordance with the extension of the web in the web breadth directional position, pressing forces in each ring of the roller to the web is controlled, and by the pressing forces and web tensions, a slight corrugation is created in the web breadth direction, to contract the web breadth in accordance with the extension in the web breadth direction. The contracted web breadth is turned into the original breadth, e.g. a web breadth that can be entered in the first step both surface printing unit 1a at printing positions Q, R, S by the bracket drums 6, 6 of both surface printing units 2a, 1b, 2b, in order to put erroneous color estimation in a tolerance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lateral register correcting device for correcting a misregistration between colors due to paper elongation in the web width direction in a double-sided multicolor rotary printing press.

[0002]

2. Description of the Related Art Conventionally, a plurality of double-sided printing units for printing on both sides of a web (paper) are provided between a pair of blanket cylinders, and the respective double-sided printing units are stacked in a plurality of upper and lower stages or arranged side by side in a horizontal direction. Thus, a multicolor printing press that performs multicolor printing on both sides of the web is known. 6 and 7 show the former conventional example. Four double-sided printing units 1, 2, 1, and 2 are stacked in four layers, and these four double-sided printing units include the inking devices 3 and 3 and the dampening devices 4 and 4.
And plate cylinders 5 and 5 and blanket cylinders 6 and 6.

A plurality of double-sided printing units 2, 1 and 2 excluding the first-side (lowermost) double-sided printing unit 1 are provided on the web-entry side of the pair of blanket cylinders 6 corresponding to both sides of the web. It is an air nozzle. The air nozzles of the double-sided printing unit 2 of the fourth stage (uppermost stage) are indicated by 7a and 7b. Reference numeral 9 is a control device, 10 is each double-sided printing unit 2, 1 except the first-stage (lowermost) double-sided printing unit 1,
The three electro-pneumatic controllers corresponding to 2 input the information on the elongation in the web width direction to the control device 9, and the control signal obtained here is sent to each electro-pneumatic controller 10 via the amplifier. While controlling the electropneumatic controller 10, the pressure air from the air supply source is sent to the pressure reducing valve → air reservoir → each electropneumatic controller 10 → each air nozzle 7 of each double-sided printing unit 2, 1, 2 and these air nozzles When pressure-adjusted air is blown from 7 to the webs simultaneously or individually to reduce the width of the webs, when the webs are printed by each double-sided printing unit, the printing pressure between the pair of blanket cylinders 6, Due to the strength difference between the longitudinal and lateral directions of the web (the longitudinal direction of the web is the longitudinal direction, and the transverse direction is the direction perpendicular to the direction of the fibre of the web), the water content of the web, and the dampening water penetration during offset printing. Web The degree drop or expansion, extending web circumferential direction and the web in the width direction (circumferential direction of the blanket cylinder 6) (the left-right direction). Although the fibers of the web are generally aligned in the up-down direction, the elongation in the width direction of the web may be about 1 mm although it depends on the web-making method.

On the other hand, since the deviation of the web in the up-and-down direction is slight, it can be considered that the deviation at each position in the up-and-down direction of the web is uniform. It can be corrected by the orientation register. On the other hand, the correction of the crosswise color misregistration due to the widthwise extension of the web is different in the lateral direction of the web because the amount of misregistration differs depending on the position in the widthwise direction of the web. As described above, in order to prevent the web from stretching in the width direction, a plurality of blanket cylinders 6 are formed on the web entrance side of the pair of blanket cylinders 6 as described above, corresponding to both sides of the web as shown in FIGS. 6 and 7. The air nozzles 7 are provided, and the pressure-adjusted air is blown from these air nozzles 7 to the web all at once or individually to reduce the width of the web (Japanese Patent Application No.
-246910).

[0005]

In the conventional lateral register correcting device for a multi-color printing press shown in FIGS. 6 and 7, a plurality of air nozzles are provided on the web-entry side of a pair of blanket cylinders 6 corresponding to both sides of the web. 7 and these air nozzles 7
The air of the adjusted pressure is blown all at once or individually to reduce the width of the web.

However, since each air nozzle 7 is mounted at a fixed position, merely by adjusting the air pressure, the amount of elongation (registration deviation amount) of the web, which differs depending on the position in the width direction, is adjusted within the allowable range. Is difficult. In addition, many air nozzles are required, and the number of parts is large,
In addition to increasing the manufacturing cost, there is a problem that a large amount of compressed air is required and the running cost is increased.

The present invention has been proposed in view of the above-mentioned problems, and the object of the present invention is to keep the misregistration between colors within an allowable range. Also, slippage between each ring and the web can be eliminated. Moreover, even if the ink on the ring is transferred again to the next pattern, it will not become dirty. Further, another object of the present invention is to provide a width register correcting device for a multicolor printing press that can automatically reduce the web width according to the elongation in the web width direction.

[0008]

In order to achieve the above-mentioned object, the present invention is a multi-color printing press constructed by combining a plurality of printing units, and one of the webs running between the printing units. A plurality of rings that contact the surface of the roller are attached to the roller so that the position in the web width direction can be adjusted.

In the width register correcting device for the multi-color rotary press, the pressing amount of each ring to the web may be adjustable. In the width register correcting device of the multi-color rotary press, each ring attached to the roller may be driven at the same peripheral speed as the traveling speed of the web. In the width register correcting device for the multi-color rotary press, the diameter of each ring may be ½ of the diameter of the plate cylinder when the plate is mounted.

In the width register correcting device of the multi-color rotary press, the web width direction position of each ring and the pressing amount to the web may be automatically adjusted.

[0011]

The width register correcting device for a multi-color rotary press according to the present invention is constructed as described above, and (1) adjusts the position of each ring of the roller in the web width direction in accordance with the elongation of the web at each position in the web width direction. Then, the web width is reduced in accordance with the elongation in the web width direction to keep the inter-color registration error within the allowable range. (2) The web width direction position of each ring of the roller is adjusted according to the elongation of the web at each position in the web width direction, while the pressing force of each ring on the roller side to the web is adjusted,
The pressing force and the web tension cause a slight waviness in the web width direction to reduce the width of the web according to the elongation in the web width direction. This reduced web width is set to the original web width at the printing position of the pair of blanket cylinders of the double-sided printing unit, that is, the web width that enters the first-stage double-sided printing unit, and the misregistration between colors is kept within the allowable range. .
(3) Each ring of the roller is driven at the same peripheral speed as the traveling speed of the web to eliminate slip between each ring and the web. (4) The diameter of each ring of the roller is set to 1/2 of the diameter of the plate cylinder when the plate is mounted. Therefore, even if the ink of the pattern on the web is transferred to the ring, the same pattern that comes next in the same phase Overlap. Therefore, even if the ink on the ring is transferred again to the next pattern, it does not become a stain. (5) During operation, the web width direction is detected, and the web width direction is adjusted by adjusting the position of each ring in the web width direction and the pressing amount of each ring against the web based on this result. Automatically reduce accordingly.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a width register correcting device for a multi-color rotary press according to the present invention will be described with reference to an embodiment shown in FIGS. Figure 1
A side view showing the arrangement of the four double-sided printing units 1a, 2a, 1a, and 2b and a roller with a ring, FIG. 2 is a perspective view of the roller with a ring, FIG. 3 is a vertical sectional side view of the roller with a ring, and FIG. FIG. 5 is a vertical sectional front view showing an arrow A portion of FIG. 3, and FIG. 5 is a vertical sectional front view taken along the line YY of FIG.

As shown in FIG. 1, a double-sided printing unit 1a,
1b, 2a, and 2b have plate cylinders 5 and 5 having an inking device 3 and a dampening device 4, and blanket cylinders 6 and 6 that are in contact with and separate from each plate cylinder 5, and are multicolor printing wheels. As for the turning point, these double-sided printing units 1a, 2a, 1a, 2
It is configured by stacking in the order of b. The web passes from the space P between the blanket cylinders 6 and 6 of the first-stage (lowermost) double-sided printing unit 1a to the space S between the blanket cylinders 6 and 6 of the fourth-stage (uppermost) double-sided printing unit 2b. To
Up to 4 colors are printed on both sides of the web.

On the other hand, between the blanket cylinders 6, 6, P, Q,
When printed by R and S, the web is mainly made up of the blanket cylinder 6 from the dampening water supplied from each dampening device 4 to the plate cylinder 5.
By being absorbed into the web after passing through, the cloth stretches or expands in the vertical direction (the circumferential direction of the blanket cylinder 6, that is, the running direction of the web) and the left-right direction (the width direction of the web). Collectively called growth).

The amount of elongation of the web in the vertical direction is small, but the amount of elongation in the width direction of the web is considerably large (about 1 mm).
(Front and back), and also depends on the web width direction position. For example, the web width extended between the double-sided printing unit 1a and the double-sided printing unit 2a is returned to the original web width immediately before entering between the blanket cylinders 6 of the double-sided printing unit 2a.

In this width register correcting device, the roller 1 with a ring is used.
1 between the duplex printing units 1a and 2a, between the duplex printing units 2a and 1b, and between the duplex printing units 1b and 2
and b respectively. The roller 11 has
As shown in FIG. 2, a plurality of rings 14 are attached at intervals in the web width direction. This roller with ring 11
3 to 5, the adjustment screw shaft 12 penetrating the hollow roller 11 allows the shaft end portion of the roller 11 to rotate on the frame via the bearing and the eccentric bush 15. It is supported, and the shaft end of the adjusting screw shaft 12 is rotatably supported by the shaft end of the roller 11 via a bearing.

The adjusting screw shaft 12 is provided with screw portions 12a, 12b, 12c having different pitches, and cross-shaped disks 13a, 13b, 13c are screwed into these screw portions 12a, 12b, 12c, The outer ends of these cross-shaped disks 13a, 13b, 13c project out of the roller 11 through the long groove 11a of the roller 11 and engage with the long groove (long groove in the axial direction) 11a of the roller 11 in the rotational direction. The roller 11 is movable in the axial direction. A ring 14 is fixed to the outer ends of the cross-shaped disks 13a, 13b, 13c via bolts 14 '.

A gear 12G is provided at one end of the screw shaft 12.
The differential gear device 21 is connected via the
Is connected to a motor 22, which drives the motor 22 to rotate the adjusting screw shaft 12 via the differential gear device 21 with respect to the cross-shaped disks 13a, 13b, 13c,
Cross-shaped disks 13a, 13b, 13c and each ring 1
4 is moved in the axial direction of the roller 11 (web width direction). At this time, the screw portion 12a provided on the adjusting screw shaft 12,
Since the pitches of 12b and 12c are different, the distance between the cross-shaped disks 13a, 13b and 13c and each ring 14 changes.

A gear 15G is provided on the eccentric bush 15, and a gear 16G is meshed with the gear 15G.
Reference numeral 18 is a motor for rotating the gear 16G via the speed reducer 17, which drives the motor 18 and transmits the rotation to the eccentric bush 15 via the speed reducer 17 → the gear 16G → the gear 15G,
The eccentric bush 15 is rotated to rotate the roller 11, and thus the cross-shaped disks 13a, 13b, 13c and each ring 1.
4 is eccentrically moved to adjust the pressing amount of each ring 14 against the web surface.

Reference numeral 9 in FIG. 3 denotes a control device, which detects the elongation in the web width direction by a sensor or the like during operation, and inputs the detection signal obtained at that time to the control device 9 to obtain the control signal ( A control signal for contracting the web corresponding to the elongation in the web width direction is sent to the motors 22 and 18. Then, the motor 22 is driven to rotate the adjusting screw shaft 12 with respect to the cross-shaped discs 13a, 13b, 13c via the differential gear device 21, and the cross-shaped discs 13a, 13b, 1
3c and each ring 14 are moved in the axial direction of the roller 11 (the width direction of the web) to move the cross-shaped disks 13a, 13a.
The intervals between b, 13c and each ring 14 are adjusted (changed).

Further, the eccentric bush 1 is driven by driving the motor 18 and rotating its rotation through the speed reducer 17 → gear 16G → gear 15G.
5, rotate the eccentric bush 15 to rotate the roller 1
(1) Then, the cross-shaped disks 13a, 13b, 13c and each ring 14 are eccentrically moved to adjust (change) the pressing amount of each ring 14 to the web surface. In this way, if the distance between the rings 14 and the amount of pressing of each ring 14 against the web surface are adjusted and pressed against one surface of the web, a slight waviness is generated in the web width direction due to the tension of the web. hand,
Reduce the width of the web. The width of the reduced web is determined by the printing position between the blanket cylinders 6, 6 of the double-sided printing units 2a, 1b, 2b, for example, the double-sided printing unit 2a.
At the printing position Q, the web width is the same as the web width that enters the P portion of the first-stage duplex printing unit 1a.

As shown in FIG. 2, the gear 5G of the plate cylinder 5 is rotated by rotating two intermediate gears 19G and the gear 11G of the roller 11.
And the ring 14 of the roller 11
Is driven at the same peripheral speed as the running speed of the web to eliminate slippage between each ring and the web. Also each ring 14
The diameter of is set to 1/2 of the diameter when the plate cylinder 5 is mounted on the plate.
Therefore, even if the ink of the pattern on the web is transferred to the ring 14, it overlaps with the next same pattern in the same phase, so that even if the ink on the ring 14 is transferred again to the next pattern,
Does not become dirty.

[0023]

As described above, the width register correcting apparatus for a multi-color rotary press according to the present invention adjusts the web width direction position of each ring of the roller in accordance with the elongation of the web at each position in the web width direction so as to adjust the web width. Since the size is reduced in accordance with the elongation in the web width direction, the misregistration between colors can be kept within the allowable range.

The position of each ring of the roller in the web width direction is adjusted according to the elongation of the web at each position in the web width direction, while the pressing force of each ring on the roller side to the web is adjusted. With this, slight waviness is generated in the web width direction, and the width of the web is reduced according to the elongation in the web width direction. This reduced web width becomes the original web width at the printing position by the pair of blanket cylinders of the double-sided printing unit, that is, the web width that enters the first-stage double-sided printing unit, so that the misregistration between colors is within the allowable range. Can fit.

Further, since each ring of the roller is driven at the same peripheral speed as the traveling speed of the web, slip between each ring and the web can be eliminated. In addition, the diameter of each ring of the roller is set to 1/2 of the diameter when the plate cylinder is mounted,
Therefore, even if the ink of the pattern on the web is transferred to the ring, it overlaps with the next same pattern in the same phase. Therefore, even if the ink on the ring is transferred again to the next pattern, it does not become a stain.

Further, during the operation, the web widthwise elongation is detected, and the web widthwise position of each ring and the pressing amount of each ring against the web are adjusted based on the result. Can be automatically reduced according to.

[Brief description of drawings]

FIG. 1 is a side view showing an arrangement of each printing unit and a roller with a ring in an embodiment of a width register correcting device for a multi-color rotary press according to the present invention.

FIG. 2 is a perspective view of the roller with the ring.

FIG. 3 is a vertical sectional side view of the roller with the ring.

FIG. 4 is a vertical sectional front view showing an arrow A portion in FIG.

5 is a vertical cross-sectional front view taken along the line YY of FIG.

FIG. 6 is a side view showing a width register correcting device of a conventional multicolor printing press.

FIG. 7 is a plan view taken along the line XX of FIG.

[Explanation of symbols]

 1a Printing unit 1b 〃 2a 〃 2b 〃 5 Plate cylinder 11 Roller 14 Ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakazu Akatsuka 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Hiromitsu Soeda, Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture 6-22 No. 22 Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd.

Claims (5)

[Claims] 1. In a multi-color rotary printing press configured by combining a plurality of printing units, a plurality of rings, which come into contact with any one surface of a web running between the printing units, are used as rollers to adjust the position in the web width direction. A multi-color rotary press width register correcting device characterized by being installed as much as possible. 2. The width register correcting device for a multi-color printing press according to claim 1, wherein the pressing amount of each of the rings against the web is adjustable. 3. The width register correcting device for a multi-color rotary press according to claim 1, wherein each ring attached to said roller is driven at the same peripheral speed as the traveling speed of the web. 4. The width register correcting device for a multi-color printing press according to claim 3, wherein the diameter of each ring is set to 1/2 of the diameter of the plate cylinder when the plate is mounted. 5. The width register correcting device for a multi-color rotary press according to claim 1, wherein the position of each ring in the web width direction and the pressing amount to the web are automatically adjusted.