JP3332557B2 - Width register correction device for multi-color printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a width register correcting apparatus for a multicolor printing press, which can be applied to a two-sided multicolor printing press and corrects color misregistration caused by elongation in the web width direction.

[0002]

2. Description of the Related Art Conventionally, a plurality of printing units for printing on both sides of paper are stacked between a pair of blanket cylinders.
Alternatively, the printing pressure between a pair of blanket cylinders when a web is printed by a printing unit by a rotary press that performs multicolor printing on both sides of the web in parallel in the horizontal direction (hereinafter, the rotary press of the former stacking example). , The strength in the vertical and horizontal directions of the web (the fiber direction of the web, ie, the running direction is vertical, and the direction perpendicular to the fiber direction, ie, the width direction is horizontal), the water content of the paper, and the web due to penetration of dampening water during offset printing. Due to the decrease in strength and expansion of the web, the web extends in the vertical direction (the running direction, that is, the circumferential direction of the blanket cylinder) and in the horizontal direction of the web (hereinafter, the width direction). Although depending on the web-making method, the web fibers are generally arranged in the vertical direction, so that the elongation in the direction perpendicular to the vertical direction (width direction) may be about 1 mm.

On the other hand, since the deviation of the web in the vertical direction is slight, the deviation at each position in the vertical direction of the paper can be regarded as uniform, and the registration of the existing plate cylinder for uniformly correcting the registration at each position in the vertical direction can be considered. It can be corrected by a vertical registration device. However, in correcting the misregistration between colors in the width direction due to the elongation in the width direction of the web, since the amount of elongation at each position in the width direction of the web is different, the misregistration between colors in the width direction is different at each position in the web width direction. Therefore, in the width direction registration device that uniformly corrects the registration at each position in the width direction, as in the existing plate cylinder, there are places where the registration error cannot be sufficiently corrected at each position in the web width direction. Conventionally, as shown in FIG. 8, a plurality of air nozzles or a pressing surface for pressing a plurality of air nozzles arranged alternately on both sides of a web on the web entry side of a pair of blanket cylinders in order to prevent the web from stretching in the width direction. (JP-A-5-178511) to reduce the web width.

In FIGS. 7 and 8 showing a conventional apparatus, reference numerals 1 and 2 denote a printing unit, 3 denotes an inking device, 4 denotes a dampening device, 5 denotes a plate cylinder, 6 denotes a blanket cylinder, and 7, 7a, and 7a.
7b is an air nozzle, 9 is a control device, and 10 is an electropneumatic controller. 7 and 8, plate cylinders 5 and 5 provided with an inking device 3 and a dampening device 4, and a pair of blanket cylinders 6 and 6 which come into contact with and separate from each of the plate cylinders 5 and 5 and come into contact with and separate from each other. For example, as shown in FIG. 7, a printing unit in which the double-sided printing units 1 and 2 provided with are alternately stacked is installed in a multi-color printing press. When the web (paper) enters from below the lowermost double-sided printing unit 1 and passes through the contact points S of the pair of blanket cylinders 6 and 6 of the uppermost double-sided printing unit 2, each of the webs has a maximum size on both sides of the web. Four colors are printed. Also, the contact points P of the pair of blanket cylinders 6, 6
When printing is performed in Q, R, and S, the web is mainly driven by the dampening solution supplied from each dampening device 4 to the plate cylinder 5 being absorbed by the web via the blanket cylinder 6 so that the web runs in the running direction (top and bottom). Direction) and in the width direction (left-right direction) or expand (hereinafter referred to as elongation). Although the elongation in the running direction of the web is small, the amount of elongation in the width direction is considerably large (about 1 mm), and varies depending on the position in the web width direction. The web width extended from the upstream printing unit 1 or 2 is returned to the original web width immediately before entering the contact point of the blanket cylinder 6 or 6 of the next printing unit 2 or 1.

[0005]

Means for reducing the width of a web with air nozzles or pressing surfaces (hereinafter referred to as a roller having a pressing surface) which are alternately arranged corresponding to both surfaces of the web. (JP-A-5-178511
In Japanese Patent Application Laid-Open Publication No. H11-163, the air pressure ejected from a plurality of air nozzles or the amount of the rollers contacting the web are adjusted simultaneously or individually, so that the misregistration between the colors of the web is corrected almost satisfactorily. Since the amount of elongation is different at the position in the width direction as described above, only adjusting the air pressure or the contact amount of the roller from the air nozzle attached at the set position,
In some cases, it was not possible to correct the misregistration between colors within an allowable range. The web width reduction effect does not change even if the air nozzle or the roller on either one of the air nozzles or the rollers provided on both sides of the web is omitted. Also, if there are rollers or air nozzles on both sides, there is a disadvantage that a space is taken up in a narrow arch, which hinders removal of the rollers. Furthermore, if the rollers and air nozzles on both sides are not removed during paper threading, it will be difficult to pass through the paper, the web will be easily entangled with the rollers when the paper breaks, and if it is entangled, it will take time to return, and the operability will be poor Become. The present invention has been proposed to solve the above-mentioned conventional problems.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a multicolor printing press in which a plurality of printing units are combined, and a negative pressure sucking under negative pressure is applied to any one surface of a web running between these printing units. A plurality of pressure nozzles and rollers contacting the one surface are alternately arranged in the web width direction at appropriate intervals, and the degree of vacuum of these negative pressure nozzles, the contact amount of the rollers against the one surface, and the negative pressure The position of the pressure nozzle and the roller in the web width direction can be adjusted, and this is a means for solving the problem. The present invention also provides
In a multi-color printing press including a plurality of printing units, a plurality of negative pressure nozzles for suctioning with a negative pressure and a plurality of positive pressure nozzles for blowing pressurized air are provided on one surface of a web traveling between the printing units. Arranged alternately in the web width direction at appropriate intervals so that the degree of vacuum of these negative pressure nozzles, the air pressure from the positive pressure nozzles, and the positions of these negative pressure and positive pressure nozzles in the web width direction can be adjusted. Further, the pressurizing and negative pressure means are provided in association with automatic control means,
It is configured to perform automatic control by selecting a preset value, and a detector for detecting the width register of the web after printing is provided, and its output is linked with the automatic control means. This is a means for solving the problem.

[0007]

With a plurality of negative pressure nozzles arranged in the width direction of the web, one surface of the web stretched by the web tension is suctioned to form waving on the suction side, thereby slightly reducing the web width. Also, with rollers arranged alternately with the negative pressure nozzle,
One side of the web is pressed to limit both ends of the range in the width direction of the web to be sucked by the negative pressure nozzle, and at the same time, the one side of the web is opposite to the suction side by increasing or decreasing the amount of web pressing of the rollers. To further finely adjust the reduction amount by the negative pressure nozzle. Next, since the position of the negative pressure nozzle and the roller in the web width direction can be adjusted, each position (section) in the web width direction can be adjusted.
The web reduction amount and the reduction range can be adjusted at an appropriate position in accordance with the web expansion amount at the time.

[0008] One side of the web is sucked by the negative pressure nozzle, and the web width is sucked to reduce the web width. In addition, one side of the web is pushed by the positive pressure nozzle, and the range of the web width direction sucked by the negative pressure nozzle is limited, and at the same time, the air pressure ejected from the positive pressure nozzle is adjusted, and Adjust the reduction amount more finely. Next, by the negative pressure and positive pressure nozzles that can move in the web width direction, according to different web elongation amounts at each position (section) in the web width direction,
The reduction amount and reduction range of the web can be adjusted at an appropriate position. In addition, these operations can be performed without contacting one surface of the web, and the picture of the web is not stained. As described above, the width of the web reduced by the slight waving generated in the width direction of the web is the original web width at the position where printing is performed by the pair of blanket cylinders of the next printing unit, that is, the first-stage printing. It is the web width that enters the unit. After printing, the web stretches in the width direction as the distance from the printed web increases due to the printing pressure, the water content of the web, the strength of the web, the web tension, and the like.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 6 show an embodiment of the present invention. FIG. 1 shows four sets of printing units of a multi-color rotary press according to the present invention, and FIG. 1 shows an example of the arrangement of the width register correcting device provided in the first embodiment. 2 and 3 show a first embodiment of the width register correcting device provided with a negative pressure nozzle and a roller, a second embodiment of the present invention provided with a negative pressure nozzle and a positive pressure nozzle, and FIG. 4 shows a roller of the first embodiment. FIG. 5 is a perspective view showing a state in which a plurality of pressing rollers provided in the width direction of the web are attached to the printing unit. FIG. 5 shows the roller attached to the pressing roller, and FIG. 6 shows the negative pressure nozzle or the positive pressure nozzle attached to the cross beam. It shows the state that it was turned on. 1 to 6, the same members as those in FIG. 7 will be described using the same reference numerals.

Referring to FIG. 1, plate cylinders 5 and 5 having an inking device 3 and a dampening device 4 are provided. A pair of blanket cylinders 6 and 6 are respectively connected to and separated from the plate cylinders 5 and 5 and are also separated from each other. For example, a printing unit in which double-sided printing units 1 and 2 provided with the printing units are alternately stacked is installed in a multi-color printing press. The web (paper) enters from below the lowermost double-sided printing unit 1 and passes through the contact points S of the pair of blanket cylinders 6, 6 of the uppermost double-sided printing unit 2. The colors are printed. When printing is performed at the contact points P, Q, R, and S of the pair of blanket cylinders 6, 6, the web is mainly made of a dampening solution supplied from each dampening device 4 to the plate cylinder 5. By being absorbed by the web via the trunk 6, it expands or expands in the running direction (top and bottom direction) and the width direction (right and left direction) (hereinafter referred to as elongation). Although the elongation in the running direction of the web is small, the amount of elongation in the width direction is considerably large (about 1 mm), and this differs depending on the position in the web width direction.

The web width extended from the upstream printing unit 1 or 2 is returned to the original web width immediately before entering the contact point of the blanket cylinder 6, 6 of the next printing unit 2 or 1. In the first embodiment shown in FIG. 2, the width register correcting device 30 includes a plurality of negative pressure nozzles 21 on one surface of the web in a web width direction and a plurality of rollers 14 attached to one pressing roller 11. However, in the second embodiment shown in FIG. 3, a plurality of negative pressure nozzles 21 and positive pressure nozzles 22 are alternately provided at appropriate intervals in the web width direction on one surface of the web. The width register correcting device 30 is installed between the printing units 1 and 2 or 2 and 1. As shown in FIG. 4, both shafts of the pressing roller 11 are fixed to a pair of frames, and a plurality of rollers 14 are attached at appropriate intervals in the axial direction as shown in FIG.

In FIG. 5, a concentric bush 12 is engaged with the pressing roller 11 in the circumferential direction and supported so as to be movable in the axial direction of the roller 11, and the concentric bush 12 is rotatable. A roller 14 is mounted via the fitted eccentric bush 13. A tool (bar) is inserted into the hole 13a of the eccentric bush 13, and the eccentric bush 13 is turned to adjust the amount of contact with one surface of the web. The concentric bush 12 having the female screw 12a screwed to the adjusting screw 16 is moved in the axial direction of the roller 11 (web width direction) by the adjusting screw 16 screwed to the bracket 15 fixed to the roller 11. Let it. The lock bolt 17 prevents the adjustment screw 16 from moving in the web width direction (the axial direction of the adjustment screw 16).
0 is a collar for rotatably supporting the adjusting screw 16. The above is a manual operation, but it can be automated.

In FIG. 6, the negative pressure nozzle 21 or the positive pressure nozzle 22
Is mounted on a cross beam 24 via a hose 23 by a negative or positive pressure piping system so as to be movable in the web width direction. 25 is a bracket fixed to the cross beam 24, 26 is an adjusting screw, 27 is screwed to the adjusting screw 26 and slides on the cross beam 24 in the web width direction, and the negative pressure nozzle 21 or the positive pressure nozzle 2
Reference numeral 2 denotes a moving table to which the moving table is attached. 2 and 3, when the web is sucked by the negative pressure nozzle 21, the web undulates toward the suction side according to the adjusted degree of vacuum to reduce the web width. Further, the starting point of the waving in the web width direction is determined by the roller 14 and the positive pressure nozzle 22 so that the suction port of the negative pressure nozzle 21 does not contact the web.

Further, the pressing force of the roller 14 against the web and the air pressure blown out from the positive pressure nozzle 22 are adjusted, and the web is pushed to the side opposite to the suction side to further reduce the web width. The adjustment of the web width reduction is performed according to different web elongation at each position (section) of the web width because the negative pressure nozzle 21, the roller 14, and the positive pressure nozzle 22 can move in the web width direction.
By moving these nozzles 21 and 22 and the rollers 14 to appropriate positions, the width of the web can be partially reduced and adjusted variously. FIG. 3 shows the negative pressure nozzle 21 and the positive pressure nozzle 2 of the second embodiment.
2 in which the width of the web is reduced in the width direction by automatically controlling the degree of vacuum of the negative pressure nozzle 21 and the air pressure from the positive pressure nozzle 22 (Japanese Patent Application No. 5-2469).
No. 10). In this automatic control, the amount of elongation in the web width direction detected by a sensor or the like is input to the control device 9, and the degree of vacuum and air pressure for reducing the web width corresponding to the amount of elongation are commanded by electric quantities, The electropneumatic controller 10 converts the air into a vacuum degree and an air pressure, and supplies the converted air to the negative pressure nozzle 21 and the vacuum nozzle 22.

[0015]

According to the present invention, as described in detail above, a plurality of negative pressure nozzles and a plurality of negative pressure nozzles and a plurality of positive pressure nozzles are alternately provided on one surface of the web. Since the webs are provided at intervals, when one surface of the web is sucked, the web undulates on the suction side, the web is reduced, and the starting point of the undulation is determined by a roller or pressure air from a positive pressure nozzle. Further, by adjusting the amount of contact of the rollers with the web or the air pressure from the positive pressure nozzle, the web can be pushed to the side opposite to the suction side, and the web can be further reduced.
Next, since the negative pressure nozzle, the roller and the positive pressure nozzle can move in the width direction of the web, the web can be variously reduced corresponding to different elongations depending on the position in the width direction of the web.
Further, the width direction correcting device provided with the negative pressure nozzle and the positive pressure nozzle reduces the web width without contacting the web, so that the picture on the web is not stained. In addition, if the rollers are arranged in a non-printed area on the paper and brought into contact with the width direction correcting device provided with the negative pressure nozzle and the rollers, the rollers will not be stained.

[Brief description of the drawings]

FIG. 1 is a front view showing an arrangement of a printing unit and a width register correcting device of a multicolor rotary press according to an embodiment of the present invention.

FIG. 2 is a component layout diagram of the first embodiment of the width register correcting device of FIG.

FIG. 3 is a component layout diagram of a second embodiment of the width register correcting device in FIG.

FIG. 4 is a perspective view showing a state in which a pressing roller having a plurality of rollers of FIG. 1 is attached to a printing unit.

FIG. 5 is a cross-sectional view showing a structure in which the roller of FIG. 4 is attached to a pressing roller.

FIG. 6 is a sectional view showing a structure in which a negative pressure nozzle and a positive pressure nozzle are attached to a cross beam.

FIG. 7 is a front view showing an arrangement of an automatic width register correcting device using a conventional air nozzle.

FIG. 8 is a view as seen from arrows Y to Y in FIG. 7;

[Explanation of symbols]

 1, 2 printing unit 3 inking device 4 dampening device 5 plate cylinder 6 blanket cylinder 11 pressing roller 12 concentric bush 13 eccentric bush 14 roller 16 adjustment screw 21 negative pressure nozzle 22 positive pressure nozzle 23 hose 24 cross beam 25 bracket 26 adjustment screw 27 Moving table 30 Width register correcting device P, Q, R, S Contact point of a pair of blanket cylinders 6

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-47908 (JP, A) JP-A-53-25105 (JP, A) JP-A-6-270383 (JP, A) 16045 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B41F 33/06 B41F 13/02 B41F 13/12 B41F 33/14

Claims (4)

(57) [Claims] In a multi-color printing press including a plurality of printing units, a negative pressure nozzle sucking a negative pressure on one surface of a web running between the printing units and the one surface contacts the one surface. A plurality of rollers are alternately arranged in the web width direction at appropriate intervals, and the degree of vacuum of these negative pressure nozzles,
A width register correcting device for a multicolor printing press, wherein the contact amount of the roller with the one surface and the position of the negative pressure nozzle and the roller in the web width direction can be adjusted. 2. A multi-color rotary press including a plurality of printing units, wherein a negative pressure nozzle that sucks a negative pressure and a pressurized air that blows pressurized air are applied to one surface of a web running between the printing units. A plurality of pressure nozzles are alternately arranged in the web width direction at appropriate intervals, and the degree of vacuum of these negative pressure nozzles, the air pressure from the positive pressure nozzle, and the positions of these negative pressure and positive pressure nozzles in the web width direction are determined. A width register correcting device for a multicolor printing press, wherein the width register can be adjusted. 3. The width register correcting device for a multi-color printing press according to claim 2, wherein said pressurizing and negative pressure means are provided in association with automatic control means, and automatic control is performed by selecting a predetermined value. Width register correction device for multicolor rotary presses. 4. A width register correcting apparatus for a multi-color printing press according to claim 3, further comprising a detector for detecting a width register of the web after printing, and linking an output thereof to said automatic control means. Register correction device for multi-color printing presses.