JP3611254B2 - Multi-color printing press width register correction device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a width register correcting device that corrects misregistration between colors due to paper elongation in the web width direction in a double-sided multicolor printing press.
[0002]
[Prior art]
Conventionally, a plurality of double-sided printing units that print on both sides of a web (paper) between a pair of blanket cylinders, and the double-sided printing units are stacked in a plurality of upper and lower stages or arranged side by side in the horizontal direction. Multi-color printing presses that perform multi-color printing are well known.
6 and 7 show the former conventional example. Four double-sided printing units 1, 2, 1, and 2 are stacked in four upper and lower stages, and these four double-sided printing units include inking devices 3 and 3, dampening devices 4 and 4, and plate cylinders 5 and 5. And blanket cylinders 6 and 6.
[0003]
7 is a plurality of air nozzles provided corresponding to both sides of the web on the web entry side of the pair of blanket cylinders 6 of the duplex printing units 2, 1, 2 except the duplex printing unit 1 of the first level (bottom level). . The air nozzles of the duplex printing units 1 and 2 are indicated by 7a and 7b.
9 is a control device, and 10 is a three electropneumatic controller corresponding to each duplex printing unit 2, 1, 2 except for the duplex printing unit 1 in the first stage (bottom stage), and controls information on the elongation in the web width direction. The control signal obtained here is sent to each electropneumatic controller 10 through an amplifier to control each electropneumatic controller 10 while controlling the pressure air from the air supply source to the pressure reducing valve → Air reservoir-> each electropneumatic controller 10-> send to each air nozzle 7 of each double-sided printing unit 2, 1, 2 and blow the air whose pressure is adjusted from these air nozzles 7 to the web all at once or individually. When the web that is to be reduced is printed by each double-sided printing unit, the printing pressure between the pair of blanket cylinders 6, the difference in strength between the vertical and horizontal directions of the web (the fiber direction of the web is the vertical direction, the fiber of the web Transverse direction perpendicular to direction ), And during offset printing, the web is oriented in the vertical direction (circumferential direction of the blanket cylinder 6) and in the width direction of the web (left and right) due to the decrease in the strength and expansion of the web due to the penetration of dampening water. Direction). This phenomenon is called fan-out, and most of the fan-out is asymmetric on both the left and right sides of the web width center. Although it depends on the web-making method, the web fibers are generally aligned in the vertical direction, and therefore the elongation in the width direction of the web may be about 1 mm.
[0004]
On the other hand, since the deviation in the vertical direction of the web is slight, the deviation in each position in the vertical direction of the web may be considered uniform, and the misregistration between colors due to the elongation in the vertical direction of the web is the registration in the vertical direction of the existing plate cylinder. It can be corrected by the aligning device.
On the other hand, the correction of the misregistration between colors in the width direction due to the elongation in the width direction of the web is different in the amount of misregistration depending on the position in the width direction of the web. In order to prevent stretching in the width direction of the web, a plurality of portions corresponding to both sides of the web as shown in FIGS. 6 and 7 are provided on the web entry side of the pair of blanket cylinders 6 as described above. These air nozzles 7 are provided, and the air whose pressure is adjusted is blown simultaneously or individually from these air nozzles 7 to the web to reduce the width of the web (if necessary, the specification of Japanese Patent Application No. 5-246910) See).
[0005]
[Problems to be solved by the invention]
In the conventional multi-color printing press width register correcting apparatus shown in FIGS. 6 and 7, a plurality of air nozzles 7 are arranged on the web entry side of the pair of blanket cylinders 6 corresponding to both sides of the web. The width of the web is reduced by blowing the adjusted air pressure simultaneously or individually onto the web.
[0006]
However, the fanout is left-right asymmetric as described above, and the shape of the fanout on both the left and right sides may be considerably different, and there is a case where the fanout cannot be eliminated with one wrinkle roller.
In addition, a large number of air nozzles are required, and the number of parts is large. In addition to increasing the manufacturing cost, a large amount of pressurized air is required, which increases the running cost.
[0007]
The present invention is proposed in view of the above-mentioned problems, and the object process is as follows: (1) It is possible to eliminate fan-out that cannot be achieved by one wrinkle roller, and (2) each ring and web (3) Even if the ink on the ring re-transfers to the next pattern, it does not become dirty, and (4) The web width is automatically set according to the elongation in the web width direction. It is an object to provide a width register correcting device for a multi-color printing press that can be reduced in size.
[0008]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a multi-color printing press configured by combining a plurality of printing units, and has a plurality of rings in contact with any one surface of a web traveling between the printing units. It is possible to adjust the position in the web width direction so as to change the interval between the rings, and two rollers are provided separately in the web width direction. to (claim 1).
[0009]
In the lateral register correcting device of the multi-color rotary press, it may be adjustable to pressing amount to the respective annular rib (claim 2). In the lateral register correcting device of the multi-color rotary press, it may be used to drive the respective rings at the same peripheral speed as the web speed (claim 3).
[0010]
In the width register correcting device of the multi-color printing press, the web width direction position of each ring is detected by detecting the stretch in the web width direction and driving a motor that changes the interval between the rings in response to the stretch. And a controller that adjusts the amount of pressing of each ring against the web by driving a motor that eccentrically moves each of the rings (Claim 4 ).
[0011]
[Action]
The width register correcting device for a multi-color printing press according to the present invention is configured as described above. (1) Since it is a split-type wrinkle roller, the left and right side of the left and right sides are adjusted according to the shape of the left-right asymmetric fanout in the web width direction. The installation position in the web advancing direction of the divided wrinkle rollers arranged in each is changed. Since the adjustment range of the pressing amount of the ring is limited, adjustment that cannot be achieved with a single wrinkle roller is possible. (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, the web width is reduced according to the elongation in the web width direction, and the misregistration between colors is within an allowable range. Fit in. (3) While adjusting the web width direction position of each ring of the roller according to the elongation of the web at each position in the web width direction, the pressing force of each ring on the roller side against the web is adjusted. Thus, a slight undulation is generated in the web width direction, and the width of the web is reduced in accordance with the elongation in the web width direction. The reduced web width is set to the original web width at the printing position by the pair of blanket cylinders of the duplex printing unit, that is, the web width entering the first stage duplex printing unit, and the misregistration between colors is within an allowable range. . (4) Each ring of the roller is driven at the same peripheral speed as the running speed of the web to eliminate slip between each ring and the web. ( 5 ) During operation, the elongation in the web width direction is detected, the web width direction position of each ring and the pressing amount of each ring against the web are adjusted based on this result, and the web width is changed to the web width direction elongation. Automatically shrinks accordingly.
[0012]
【Example】
Next, a width register correcting device for a multi-color printing press according to the present invention will be described with reference to an embodiment shown in FIGS. 1 is a side view showing the arrangement of four double-sided printing units 1a, 2a, 1b, 2b and rollers with rings, FIG. 2 is a perspective view of a divided wrinkle roller, and FIG. 3 is a longitudinal side view of the divided wrinkle roller. 4 is a longitudinal front view showing a portion indicated by an arrow A in FIG. 3, and FIG. 5 is a longitudinal front view taken along the line YY in FIG.
[0013]
As shown in FIG. 1, double-sided printing units 1a, 1b, 2a, and 2b include plate cylinders 5 and 5 having an inking device 3 and a dampening device 4, and blankets that are in contact with and away from each plate cylinder 5. The multicolor rotary press has cylinders 6 and 6 and is configured by stacking these duplex printing units in the order of 1a, 2a, 1a, and 2b.
The web passes from P between the blanket cylinders 6 and 6 of the first-stage (lowermost) duplex printing unit 1a to S between the blanket cylinders 6 and 6 of the fourth-stage (uppermost) duplex printing unit 2b. In addition, a maximum of four colors are printed on both sides of the web.
[0014]
On the other hand, when printing is performed between P, Q, R, and S between the blanket cylinders 6 and 6, dampening water supplied mainly from each dampening device 4 to the plate cylinder 5 passes through the blanket cylinder 6 to the web. By being absorbed, it expands or expands in the vertical direction (the circumferential direction of the blanket cylinder 6, that is, the web traveling direction) and in the left-right direction (web width direction), thereby causing fanout.
[0015]
Although the amount of elongation in the vertical direction of the web is very small, the amount of elongation in the web width direction is quite large (about 1 mm), and varies depending on the position in the width direction of the web.
For example, the web width extended between the duplex printing unit 1a and the duplex printing unit 2a is returned to the original web width immediately before entering between the blanket cylinders 6 and 6 of the duplex printing unit 2a.
[0016]
In this width register correcting device, the split-type wrinkle rollers 11 and 11 '(both have the same structure, so only one split-type wrinkle roller 11 will be described) between the duplex printing units 1a and 2a, and the duplex printing units 2a and 1b. And between the duplex printing units 1b and 2b. As shown in FIG. 2, a plurality of rings 14 are attached to the split-type wrinkle roller 11 at intervals in the web width direction, and the split-type wrinkle roller 11 is driven.
[0017]
The details of the split-type wrinkle roller 11 will be described with reference to FIGS. 3 to 5. Reference numeral 12 in FIG. 3 denotes an adjusting screw shaft penetrating the hollow split-type wrinkle roller 11, and the shaft end portion of the split-type wrinkle roller 11 is a bearing. It is rotatably supported by a bracket 20 fixed to the frame stay via eccentric bushes 15 and 15 '(hereinafter simply referred to as eccentric bush 15), and both shaft ends of the adjusting screw shaft 12 are rollers via bearings. 11 is rotatably supported at both shaft end portions.
[0018]
The adjustment screw shaft 12 is provided with screw portions 12a, 12b, and 12c having different pitches, and the cross-shaped discs 13a, 13b, and 13c are screwed into the screw portions 12a, 12b, and 12c. The outer ends of the disks 13a, 13b, 13c project out of the split wrinkle roller 11 through the long groove 11a of the split wrinkle roller 11, and in the rotational direction, the long groove of the split wrinkle roller 11 (long groove that is long in the axial direction) 11a is engaged and movable in the axial direction of the split-type wrinkle roller 11. A ring 14 is fixed to the outer ends of the cross-shaped disks 13a, 13b, 13c via bolts 14 '.
[0019]
A differential gear device 21 is connected to one end portion of the screw shaft 12 via a gear 12G. A motor 22 is connected to the differential gear device 21, and the motor 22 is driven. The adjusting screw shaft 12 is rotated with respect to the cruciform discs 13a, 13b, 13c via the device 21, and the cruciform discs 13a, 13b, 13c and each ring 14 are moved in the axial direction of the split wrinkle roller 11 (web width). Direction). At this time, since the pitches of the screw portions 12a, 12b, and 12c provided on the adjusting screw shaft 12 are different, the intervals between the cross-shaped disks 13a, 13b, and 13c and the rings 14 are changed.
[0020]
15G is a gear provided on the eccentric bush 15, and the gear 16G meshes with the gear 15G. 18 is a motor that rotates the gear 16G via the speed reducer 17. The motor 18 is driven, and the rotation is transmitted to the eccentric bush 15 via the speed reducer 17 → the gear 16G → the gear 15G, and the eccentric bush 15 is rotated. Thus, the split type wrinkle roller 11 and thus the cruciform discs 13a, 13b, 13c and each ring 14 are moved eccentrically to adjust the pressing amount of each ring 14 against the web surface.
[0021]
Reference numeral 9 in FIG. 3 denotes a control device, which detects 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, and obtains the control signal (web width direction) A control signal for shrinking the web corresponding to the elongation of the motor) is sent to the motors 22 and 18.
Then, the motor 22 is driven, and the adjusting screw shaft 12 is rotated with respect to the cruciform discs 13a, 13b, and 13c via the differential gear device 21, and the cruciform discs 13a, 13b, 13c and each ring 14 are divided. The wrinkle roller 11 is moved in the axial direction (web width direction) to adjust (change) the intervals between the cross-shaped disks 13a, 13b, 13c and the rings 14.
[0022]
Further, the motor 18 is driven and the rotation is transmitted to the speed reducer 17 → the gear 16G → the gear 15G → the eccentric bush 15 and the eccentric bush 15 is rotated so that the divided wrinkle roller 11 and the cross type disks 13a, 13b and 13c are rotated. And each ring 14 is eccentrically moved, and the pressing amount to the web surface of each ring 14 is adjusted (changed).
By adjusting the distance between the rings 14 and the pressing amount of each ring 14 to the web surface and pressing the ring 14 against one surface of the web, a slight undulation is generated in the web width direction due to the web tension. To reduce the web width. The width of the reduced web is the printing position between the blanket cylinders 6 and 6 of the duplex printing units 2a, 1b, and 2b, for example, P portion of the first duplex printing unit 1a at the printing position Q of the duplex printing unit 2a. It will be the same as the web width entering.
[0023]
Further, as shown in FIG. 2, the rotation of the gear 5G of the plate cylinder 5 is transmitted to the roller 11 through the two intermediate gears 19G and the gear 11G of the roller 11, and each ring 14 of the roller 11 has the same peripheral speed as the web traveling speed. Drive in to eliminate slip between each ring and the web.
The diameter of each ring 14 is set to ½ of the diameter when the plate cylinder 5 is mounted. Therefore, even if the ink of the pattern on the web is transferred to the ring 14, it overlaps with the same pattern that comes next in the same phase, so even if the ink on the ring 14 is transferred again to the next pattern, it does not become dirty.
[0024]
【The invention's effect】
Since the width register correcting device for a multi-color printing press according to the present invention is a split-type wrinkle roller as described above, the split-type wrinkle roller disposed on each of the left and right sides according to the shape of the left-right asymmetric fanout in the web width direction. It is possible to change the installation position of the web in the direction of web travel and to eliminate fan-out that cannot be achieved with a single wrinkle roller.
[0025]
In addition, the web width direction position of each ring of the roller is adjusted according to the elongation of the web at each position of the web width direction that is asymmetric in the web width direction, and the web width is reduced according to the elongation in the web width direction. The misregistration can be within an allowable range.
Also, for each split type wrinkle roller, 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 against the web is adjusted. And the web tension cause slight waviness in the web width direction, and the web width is reduced in accordance with the elongation in the web width direction. The reduced web width becomes the original web width at the printing position by the pair of blanket cylinders of the duplex printing unit, that is, the web width that enters the first stage duplex printing unit, so that the misregistration between colors is within an allowable range. Can fit.
[0026]
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.
[0027]
Further, during operation, the web width direction is detected and the web width direction position of each ring and the pressing amount of each ring against the web are adjusted based on this result. Can be reduced automatically.
[Brief description of the drawings]
FIG. 1 is a side view showing an arrangement of a printing unit and split wrinkle rollers in an embodiment of a width register correcting device for a multi-color printing press according to the present invention.
FIG. 2 is a perspective view of the split-type wrinkle roller.
FIG. 3 is a longitudinal side view of the split-type wrinkle roller.
4 is a longitudinal front view showing a portion indicated by an arrow A in FIG. 3. FIG.
5 is a longitudinal sectional front view taken along the line YY of FIG.
FIG. 6 is a side view showing a width register correcting device for a conventional multicolor printing press.
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, 11 'Split type wrinkle roller 14 Ring

Claims (4)

In a multi-color printing press configured by combining a plurality of printing units, the multi-color printing press includes a roller having a plurality of rings that are in contact with any one surface of a web traveling between the printing units, and the rings are spaced apart from each other. A width register correcting device for a multi-color printing press , wherein the web width direction position can be adjusted so as to change, and two rollers are provided separately in the web width direction . The lateral register correcting device of multi-color rotary press according to claim 1, characterized in that the adjustable pressing amount to the respective annular rib. The width register correcting device for a multi-color printing press according to claim 1 or 2, wherein each ring is driven at the same peripheral speed as the traveling speed of the web. In accordance with the elongation, the web width direction position of each ring is adjusted by driving a motor that changes the spacing between the rings in response to the elongation. The width register correcting device for a multi-color printing press according to any one of claims 1 to 3 , further comprising a control device for adjusting a pressing amount of each ring to the web by driving a motor.

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