JPH06155702A - Web writing paper width adjusting device - Google Patents

Abstract

PURPOSE:To prevent the mismatching generating by the stretch of printed areas printed earlier and later in the width direction of a web writing paper by providing rotors with the rotation centers formed at the center of the web writing paper slanting downwardly to the upstream side in the traveling direction in the vicinity of a printing section in a manner of being in contact with the face of the web writing paper and almost symmetrical on the left and right of the width direction of the web writing paper. CONSTITUTION:Several rotors 2 such as rollers or small rollers 1 with the rotation centers formed at the center of a web writing paper W and slanting downwardly to the upstream side in the traveling direction are in the vicinity of at least one side of either of the upstream or downstream of a printing section in a manner of being in contact with at least one face of the web writing paper W and set almost symmetrically on the left and right of the width direction of the web writing paper W. As a result, the mismatching generated by the stretch of a printed area printed earlier and another printed area printed later can be prevented without using water other than required for printing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithographic printing press for superposing printing on a web material with a plurality of printing sections, and an apparatus for adjusting the width of the web material after the printing by at least the first printing section. Regarding

[0002]

2. Description of the Related Art In recent years, a lithographic printing press for carrying out overprinting has been developed, for example, in the multicolor printing of newspapers, and it is desired to carry out multipage multicolor printing in a limited installation space. And the demand for
As shown in FIG. 2, two combinations of a plate cylinder PC and a blanket cylinder BC are arranged on the left and right so that the respective blanket cylinders BC can be pressure-contacted to form a printing section P, and four printing sections P are arranged in an overlapping manner. Have been published (eg INCA
-FIEJ Research Association
IFRA Newspacer, published by (INA-FJ Research Association)
Techniques English Edition
(IFR News Paper Technics English Edition) 1988. APRI
L, pp. 64-73). In this lithographic rotary printing press, the web material W is caused to run substantially vertically, and the blanket cylinders BC, BC pressed against each other, that is, the printing portion P, are sequentially passed to perform printing on both sides of the web material W.

By the way, in lithographic printing using dampening water, when the web material paper W passes through the printing section P, an image line is printed and water is added thereto.
Since the pulp fibers of No. 1 absorb and swell in the diameter direction, the web paper W expands in the width direction. Therefore, in the overprinting by the planographic rotary printing machine as shown in FIG. 10 and FIG. 11, the width direction expansion of the web material W is performed between the print image line printed earlier and the print image line printed later. Resulting in inconsistency. Therefore, for example, Japanese Patent Laid-Open No. 4-
The devices disclosed in Japanese Patent No. 73148 and Japanese Patent Laid-Open No. 4-112043 have been proposed. These apparatuses are intended to prevent misalignment of printed lines by applying water to the web material before printing, expanding the web material in the width direction in advance, and performing overlapping printing.

[0004]

However, in the apparatus disclosed in the above publication, sufficient effect cannot be obtained unless a relatively large amount of water is applied to the web material before printing, and only sufficient effect can be obtained. When water is added, the web paper that has absorbed water becomes bulky and heavy.For example, as in newspaper printing, the web is run to the fold, and many webs are stacked and folded, and then cut. In the processing, the load when the web paper slides on the turning bar and the triangular plate (homer) increases, and the load at the time of cutting and folding at the folding cylinder also increases.
Even in the shipping process after the delivery, some inconveniences due to the increase in bulk and weight occurred.

The present invention has been made in view of the above, and it is possible to use water other than water necessary for printing,
It is an object of the present invention to prevent a misalignment between a printed image printed first and a printed image printed later, which is caused by the expansion of the width direction of the web material.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a center of rotation on at least one surface of a running web material, the center of rotation of the web material being inclined downward toward the upstream side in the running direction. It has a basic configuration in which some rolling elements having the above are brought into contact and rotated.
Further, these rolling elements and the same rolling element as described above which is brought into contact with the other surface of the running web material paper to be rotated, or the web material paper which is brought into contact with the other surface of the running web material paper to be turned. It is intended to achieve the above-mentioned object by a structure in which a running web material paper is sandwiched by rollers provided in parallel with the width direction of the paper.

[0007]

[Operation] A number of rolling elements having a center of rotation of the web W that is inclined downward toward the upstream side
When the web is in contact with the web material W and is rotated in a direction that matches the running of the web material W, the rolling element is in the direction of its rotation, that is, the direction perpendicular to the center of rotation of the rolling element. A force F is applied to the web material W to the center of W and to the downstream side in the traveling direction, and by the action of this force F, the web material W
Are urged toward the center, and the deviation escapes to a portion where there is no rolling element, and a wavy WA substantially parallel to the longitudinal direction is generated. Then, a tension A in the longitudinal direction inclined toward the center line CL side of the web material W acts on the web material W between the printing portion P and the contact position of the rolling element, and the rolling element is bordered by the printing portion P. A tension B in the longitudinal direction parallel to the center line CL of the web material W is applied to the web material W on the side where the is not provided. Therefore, in the printing section P, the force C acting on the web material W toward the center in the width direction acts (see FIGS. 1, 3, 5, and 7).

In this state, when the printing cylinder (for example, the blanket cylinders BC, BC) that nips the web material paper W in the printing section P is rotated and the web material paper W runs, the web material paper W approaches the center and the force C is applied. Disappears, the tension A and the tension B act on the same straight line and become stable, and the web paper W is as shown in FIGS.
As shown in FIGS. 6 and 8, printing is performed by passing through the printing section P in a state where the both sides of the paper are shortened. When sandwiching the running web material W with a rolling element having a center of rotation of the web material W that is inclined downward toward the upstream side, or with the rolling element and a roller parallel to the width direction of the web material W Is a force F by the rolling element in a direction perpendicular to the center of rotation.
Is reliably applied to the web material paper W. Further, by appropriately adjusting the state of the wavy WA generated on the web material paper W, it is possible to allow the web material paper W to pass through the printing portion P in a state where the space between both sides of the paper material is shortened and without wrinkles. it can.

It is not clear why the web material W can pass under the printing pressure of the printing section P in a state where both sides of the material sheet are shortened and wrinkle-free, but printing is performed in a state where both sides of the material sheet are shortened. When passing under, inside the web paper W,
Occurrence of merging that cannot be visually confirmed, for example, increase in aggregation or overlap of fibers constituting the web material W,
It is considered that this is due to the action of being pressed by the printing pressure to become a unity of the fibers and stabilize.

As described above, by absorbing the dampening water applied at the time of the previous printing, the widthwise expansion of the web material, which occurs while reaching the next printing portion, is reduced to the center of the web material paper. And by contact rotation of the rolling element having a rotation center that is inclined downward toward the upstream side with the web material paper,
By moving the web material paper to the center and generating an appropriate corrugation substantially parallel to the longitudinal direction of the web material paper, the space between the two sides of the paper material (that is, the width of the web material paper) when passing through the next printing portion is reduced and offset. As described above, the lines of images to be overprinted on the web material by the plurality of printing units are aligned and the printed image is properly arranged.

[0011]

EXAMPLES Next, examples of the present invention will be described with reference to the drawings. 1 to 9 show an embodiment of the web width adjusting means 10. Reference numeral 1 is a roller or a small roller which is a rolling element. Roller or small roller 1
Has a center of rotation 2 that is inclined downward toward the center of the web material W and upstream in the traveling direction.
In the planographic rotary printing press as shown in FIG. 1, the peripheral surface thereof is located near the upstream side of the printing section P as shown in FIGS. 1 and 2 or near the downstream side of the printing section P as shown in FIGS. But,
It is provided so as to contact one surface of the running web material W and to rotate in the direction indicated by arrow X in the contact state. Further, the rollers or the small rollers 1 are driven in a predetermined speed relationship with the lithographic printing press so that the rollers or the small rollers 1 can be rotated with the traveling of the web material W and / or by a rotation driving member (not shown). The rotation drive member (not shown) is automatically controlled so as to maintain a predetermined relationship with the operating speed of the planographic rotary printing press, and the predetermined relationship can be appropriately adjusted. Thus, it is provided in association with the roller or the shaft of the small roller 1.

The embodiment shown in FIGS. 5, 6 and 7, 8 is
In each of the configurations of the embodiment shown in FIGS. 1 and 2 or the embodiment shown in FIGS. 3 and 4, a roller 3 capable of contacting the other surface of the web material W is provided substantially parallel to the width direction of the web material W. The roller 3 and the roller or small roller 1 sandwich the web material W. Further, the roller 3 that can contact the other surface of the web material W can be rotated as the web material W travels, and / or by the rotation driving body 4, the roller 3 can be rotated at a predetermined speed with the lithographic printing press. The rotary drive body 4 is automatically controlled so as to maintain a predetermined relationship with the operating speed of the lithographic printing press, and adjusts the predetermined relationship appropriately. The roller 3 is provided so as to be linked to the shaft of the roller 3. The roller 3 that can contact the other surface of the web material W may be provided in a plurality of forms (not shown) divided in the axial direction, or as shown in FIG. 9, a roller that can contact one surface. Or, it may be provided as a roller or a small roller 1 ′ similar to the small roller 1. When the roller 3 or the roller or the small roller 1'on the other surface side is driven, the roller or the small roller 1 on the one surface side may not be driven and rotated.

Next, the operation and action of the above structure will be described.
The web material W is made to travel by the operation of the planographic rotary printing machine, while the rollers or rollers 1 in contact with the web material W are rotated by frictional force with the web material W or rotated not shown. It is driven by the driving body and rotated in the direction indicated by arrow X. In the case of the structure in which the roller 3 or the roller or the small roller 1 ′ that contacts the other surface of the web material W is provided, and the web W is sandwiched between this and the roller or the small roller 1 that contacts the one surface of the web material W, In the operation and action, the roller or the small roller 1 and the one surface of the web material W are more reliably brought into contact with each other, and the slip between them is reduced.

Further, the roller 3 or the rollers or the small rollers 1'is rotated by the frictional force with the web material W or is rotated by the rotation driving member 4 or the rollers or the small rollers 1 '. It is rotated in the direction indicated by the arrow X'by the dynamic driving body. In any of the configurations, the roller or the small roller 1 has a rotation center 2 that is inclined downward toward the center of the web material W and the upstream side in the traveling direction, and the rotation causes the web material W to rotate. It acts so as to feed the web material paper W which is at a right angle to the center of movement 2 toward the center and the downstream side in the traveling direction, that is, in the direction of the force F, whereby the web material paper W is brought to the center, Or, the deviation escapes to a portion where the small roller 1 does not exist, and a wavy WA substantially parallel to the longitudinal direction is generated.

Then, the web material W between the printing portion P and the roller or the small roller 1 has a center line C of the web material W.
Tension A in the longitudinal direction inclined to the L side acts, and in the longitudinal direction of the web material W, with the printing portion P as a boundary, the web material W on the side where the rollers or the small rollers 1 are not provided, Tension B in the longitudinal direction parallel to the center line CL acts. Therefore, in the printing section P, the web material W is
A force C toward the center in the width direction acts (see FIGS. 1, 3, 5, and 7). In this state, in the printing section P, the web material W
Printing cylinders (eg blanket cylinders BC, B)
C) rotates and the web material W is running,
Due to the center of the web material paper W, the force C toward the center in the width direction disappears, and the tension A and the tension B act on the same straight line to stabilize the web material paper W, and the web material paper W is shown in FIG. 2, FIG. 4, FIG. As shown in FIG. 8, printing is performed by passing through the printing section P in a state where the both sides of the paper are shortened.

That is, for example, in a lithographic rotary printing machine as shown in FIG. 11, the lithographic rotary printing machine is operated to run the web material W, and at the same time, the printing units P1, P2, P
3 and P4 are printed. The web material W, which is run by the operation of the planographic rotary printing machine, first reaches the printing unit P1, and the printing line is printed by the printing unit P1, and from the non-printing line portion of the printing plate, the blanket cylinder BC passes through the blanket surface. Dampening water is applied. The web material W to which the dampening water is applied is made to run toward the next printing portion P2 while the fibers absorb water over time and expand in the width direction. The web material W, which is run toward the printing portion P2, is subjected to a force C toward the center in the width direction generated by the action of rollers or small rollers 1 provided in the vicinity of the upstream side or the downstream side of the printing portion P2. The distance between the two sides of the paper stock is shorter than the width of the actual web paper W and reaches the printing portion P2 where printing is performed. The same operation is performed in the web material W that passes through the printing units P2 and P3 and is run toward the printing units P3 and P4.

The amount of the shortening is determined by the roller or the small roller 1.
The magnitude of the force C toward the center in the width direction generated by the action of, for example, the contact pressure or the contact area of the roller or the small roller 1 to the web material W is an appropriate means (not shown).
By changing the frictional force between the rollers and the roller or the small roller 1 to change the magnitude of the feeding action, thereby changing the size of the wavy WA or appropriately adjusting the inclination of the roller or the small roller 1. By changing the direction in which the roller or the small roller 1 sends out the web material W by changing the means (not shown), or changing the size of the wavy WA, or the roller or the small roller 1 and the roller 3, or the roller. When driving and rotating the small roller 1 and / or the roller or small roller 1 ', the driving rotation speed with respect to the traveling speed of the web material W (that is, the operating speed of the lithographic printing press) is changed to change the roller or the small roller. 1 and / or by changing the magnitude of the feeding action by the roller or the small roller 1 ',
The size of the waving WA can be changed and appropriately adjusted.

Regarding the adjustment of the widthwise shortening amount of the web material paper W, an automatic control means (not shown) is provided, and the automatic control means is provided with brand information of the web material paper and the web material paper W.
Information (for example, the rotation speed of a main motor (not shown) that drives the lithographic printing press), and information about the amount of deviation of the printed line on the web material W (for example, the print image of the central portion of the web material W). One or more pieces of information such as the amount of line deviation and the amount of deviation of the printed image on the side) are input, and a control signal based on the input information is input to each operation adjusting means (not shown). It can also be output automatically by making it output.

By the adjustment, the web material paper W is reduced in the width direction from the printing portion P1 to the printing portion P2 between the printing portions P1 and P2 by the dampening water applied in the printing portion P1. The amount of expansion in the width direction generated during traveling is adjusted so as to be offset, the image is passed through the printing unit P2, and the image line of the printing unit P2 is printed in a state of being aligned with the image line of the printing unit P1. Further, the waviness WA caused by the delivery of the rollers or the small rollers 1 is generated substantially evenly in the width direction of the web material W, so that the shortening action is performed substantially evenly in the width direction of the web material W, and wrinkles or the like which can be visually observed. It also prevents the occurrence of defects.

According to the applicant's test, in a lithographic printing press in which printing units P1, P2, P3 and P4 are stacked as shown in FIG. 11, it is possible to rotate the printing units P2, P3 and P4 upstream, respectively. As a result of printing using newspaper roll A (1626 mm width) with the roller or small roller 1 in the width direction, the web material W absorbs water when printed without the roller or small roller 1 in the width direction. It was possible to eliminate the deviation of the image lines of the printing portions P1 to P4 due to enlargement. By the way, although the amount of expansion in the width direction differs depending on the brand of the paper roll, in the printing using the roller or the small roller 1, the printing portion P1 and the printing portion P4, which have occurred in the printing without using the roller or the small roller 1, It was possible to eliminate the deviation of the printing image line of about 2 mm (using newspaper roll A roll).

The present invention is not limited to the above-described embodiments, and, for example, rollers or small rollers 1 may be arranged in a plurality of rows in the longitudinal direction of the web material W or may be arranged in the width direction of the web material W. A plurality of rows may be provided side by side on the curved surface provided (neither is shown), and the contact portion of the roller or the small roller 1 with the web material W may have an appropriate property or form such as a brush. Further, the roller 3 provided so as to come into contact with the other surface of the web material paper may be provided with only a contact portion in a convex shape, and like the roller or the small roller 1, the contact portion with the web material W is brush-shaped. Appropriate properties such as
The form may be selected. The point is that it includes design modifications that do not depart from the scope of the claims.

[0022]

According to the embodiments of the present invention, even when two or more lithographic printing units using dampening water are used to successively print on the same web material sheet in succession, the time from the preceding printing unit to the next printing unit can be improved. The width of the web material is adjusted so as to offset the expansion of the web material in the width direction due to water absorption.Therefore, the web generated by absorbing the dampening water applied at the same time as printing in the printing section during printing is running. It is possible to eliminate the deviation between the previously printed printing line and the subsequent printing lines due to the expansion of the paper in the width direction. Therefore, it becomes possible to obtain a printed matter of good quality. Further, since no water other than dampening water required for printing is used, the web material does not become bulky and heavy by absorbing water, and when running the web material, inconvenience during cutting and folding,
Eliminates inconveniences related to shipping processing.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration and operation of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a schematic configuration and operation of the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a schematic configuration and an operation of a second embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a schematic configuration and action of a second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a schematic configuration and action of a third embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a schematic configuration and operation of a third embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a schematic configuration and operation of a fourth embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a schematic configuration and operation of a fourth embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a schematic configuration and operation of a fifth embodiment of the present invention.

FIG. 10 is a front view showing a schematic configuration of a known planographic rotary printing machine in which four printing units are stacked.

FIG. 11 is a front view showing a schematic configuration of another known lithographic printing press in which four printing units are stacked.

[Explanation of symbols]

1, 1 '... Roller or small roller (rolling element), 2, 2'
... Rotation centers of rollers or small rollers (rolling elements), 3 ... Rollers, 4 ... Rotation driving bodies, 10 ... Web material paper width adjusting means,
P, P1, P2, P3, P4 ... Printing section, PC ... Plate cylinder, B
C ... Blanket cylinder, W ... Web paper, WA ... Rippling on web paper, CL ... Center line of web paper, F ... Force exerted by roller or small roller on web paper, A, B ...
Web paper tension, C ... force towards the center of the web,
X, X '... Roll or small roller or direction in which the roller rotates.

Claims (5)

[Claims] 1. At least one of the upstream and downstream sides of the printing section is provided with several rolling elements having a center of rotation of the web and a downwardly sloping rotation center toward the upstream side in the running direction. A web paper width adjusting device for a rotary printing press, wherein the web paper width adjusting device is arranged so that it can contact at least one surface and is substantially symmetrical in the width direction of the web paper. 2. A rolling element capable of contacting one surface of the web material and a rolling element capable of contacting the other surface of the web material are provided so as to sandwich the web material therebetween. A web width adjusting device as described in. 3. A web is provided between the roller and a number of rolling elements provided so as to be able to contact the other surface of the web material and substantially parallel to the width direction and to be contactable to one surface of the web material. The web paper width adjusting device according to claim 1, wherein the web paper width adjusting device is provided so as to sandwich the paper stock. 4. The web paper width adjusting device according to claim 3, wherein a plurality of rollers are provided so as to come into contact with the other surface of the web paper. 5. The web paper width adjusting device according to claim 3, wherein a single roller is provided so as to be able to contact the other surface of the web paper.