JP2020125210A - Web tension adjustment device and method and printing machine - Google Patents

Abstract

To provide a web tension adjustment device and method and a printing machine, where the tension of the web can be adjusted and the working property of the web tension adjustment work is improved.SOLUTION: The web tension adjustment device includes: an infeed drag roller 109 (an upstream side driving roller) and an exit drag roller 118 (a downstream side driving roller) that are provided with a predetermined space therebetween in the transport direction of a web W and capable of transporting the web W; blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b that are provided between the infeed drag roller 109 and the exit drag roller 118; a tension pickup roller 111 (an upstream side tension detector) that detects tension of the web W in an upstream side section; a tension pickup roller 117 (a downstream side tension detector) that detects the tension of the web W in a downstream side section; and a control device 140 that can adjust the tension of the web W by controlling a rotation speed of the infeed drag roller 109 based on detection results of the tension pickup roller 111 and the tension pickup roller 117.SELECTED DRAWING: Figure 1

Description

The present invention relates to a web tension adjusting device and method for adjusting the tension of a web conveyed by a plurality of drive rollers, and a printing machine to which the web tension adjusting device is applied.

For example, an offset rotary printing press for newspapers includes a paper feeding device, a printing device, a web pass device, and a folding machine. Before starting printing, the offset rotary printing press for newspapers first carries out a paper threading operation in which the leading end of a web fed from a paper roll supported by a paper feeding device is guided to a folder through a printing device and a web pass device. When the paper threading operation is completed, next, a tension adjusting operation is performed to set the tension of the web passed from the paper feeding device to the folding machine to an appropriate value.

As a technique for adjusting the tension of the web, for example, there is one described in the following patent document. In the printing machine described in Patent Document 1, among the rollers provided on the web path, a roller that influences the tension of the web is placed on the web, a printing cylinder is released, and The tension application operation for increasing the tension is performed. Further, the control method at the time of starting the operation of the rotary printing press described in Patent Document 2 makes the peripheral speed of the upstream drag lower than the peripheral speed of the downstream drag so that the peripheral speed between the upstream drag and the downstream drag is reduced. When the web tension reaches an appropriate value, the upstream drag is returned to the slow operating speed.

JP, 2008-105277, A Japanese Patent No. 3564409

In the above-mentioned conventional printing machine, the tension of the web is increased in the state where the printing cylinder is detached from the web. At this time, the upstream drag is slowed down relative to the downstream drag to increase the web tension, and when the web tension reaches an appropriate value, the upstream drag is returned to the slow operating speed. By the way, in the printing press, even when the printing cylinder is separated from the web, a part of the printing cylinder is in contact with the web. Therefore, even if the tension of the web is adjusted between the upstream drag and the downstream drag, the tension of the web on the downstream side of the printing cylinder may be lower than an appropriate value. Then, in this state, when the printing cylinder is attached to the web, there is a problem that the web that is not in an appropriate tension is subjected to excessive stress and is broken.

The present invention solves the above-described problems, and provides a web tension adjusting device and method, and a printing machine that can appropriately adjust the web tension and improve the workability of the web tension adjusting work. The purpose is to

The web tension adjusting device of the present invention for achieving the above object is an upstream drive roller and a downstream drive roller that are arranged at a predetermined interval in the web transport direction and are capable of transporting the web, and the upstream drive roller. An intermediate drive roller disposed between the side drive roller and the downstream drive roller and capable of transporting the web, and a tension of the web in an upstream section upstream of the intermediate drive roller in the transport direction of the web. An upstream tension detector that detects the tension, a downstream tension detector that detects the tension of the web in a downstream section on the downstream side in the transport direction of the web from the intermediate drive roller, the upstream tension detector, and the downstream. And a controller capable of adjusting the tension of the web by controlling the rotational speed of the upstream drive roller based on the detection result of the side tension detector.

Therefore, the tension of the web is adjusted by controlling the rotation speed of the upstream drive roller based on the tension of the web in the upstream section and the tension of the web in the downstream section with respect to the intermediate drive roller. Even if the intermediate drive roller is provided between the downstream section and the downstream section, the tension of the web in the upstream section and the tension of the web in the downstream section can be properly adjusted. As a result, the tension of the web can be appropriately adjusted, and the workability of the tension adjustment work of the web can be improved.

In the web tension adjusting device of the present invention, the controller adjusts the tension of the web in the downstream section to a preset proper downstream tension, and then presets the tension of the web in the upstream section. It is characterized in that it is adjusted to the appropriate upstream tension.

Therefore, after adjusting the web tension in the downstream section to the downstream proper tension, the web tension in the upstream section is adjusted to the upstream proper tension. It is possible to efficiently adjust the tension of the web without changing the tension of the web adjusted to the tension.

In the web tension adjusting device of the present invention, the control device sets the rotation speed of the upstream drive roller to be lower than the rotation speed of the downstream drive roller, and the tension of the web in the downstream section is appropriate for the downstream side. When the tension is reached, the rotation speed of the upstream drive roller is controlled so that the downstream proper tension is maintained.

Therefore, since the rotational speed of the upstream drive roller is set to be lower than the rotational speed of the downstream drive roller, the web tension can be easily increased, and the web tension in the downstream section is adjusted to the downstream proper tension. Then, since the rotational speed of the upstream drive roller is controlled so that the downstream proper tension is maintained, the tension of the web can be efficiently adjusted.

In the web tension adjusting device of the present invention, when the tension of the web in the downstream section reaches a preset downstream proper low tension lower than the downstream proper tension, the controller drives the upstream drive roller. It is characterized by changing the rotation speed of to adjust to the proper tension.

Therefore, when the tension of the web in the downstream section reaches the downstream proper low tension, the rotational speed of the upstream drive roller is changed to adjust to the proper tension, so that the tension of the web is gradually increased. It is possible to suppress breakage of the web due to a rapid increase in tension.

In the web tension adjusting device of the present invention, a pressing roller for sandwiching the web by being in contact with at least one of the upstream drive roller and the downstream drive roller is provided, and the control device includes the downstream side. When the tension of the web in the section reaches the downstream proper low tension, the pressing roller is moved from the releasing position to the landing position.

Therefore, when the tension of the web in the downstream side section reaches the proper low tension on the downstream side, the pressing roller moves from the detached position to the landing position, so that the web is nipped by the upstream driving roller and the downstream driving roller and each pressing roller. In this state, the tension of the web increases, and the web is stably supported, so that breakage of the web can be suppressed.

In the web tension adjusting device of the present invention, a pressing roller for sandwiching the web by being in contact with at least one of the upstream drive roller and the downstream drive roller is provided, and the control device includes the downstream side. After adjusting the tension of the web in the section to the proper tension on the downstream side, the intermediate drive roller in the separated position is moved to the contact position, and then the pressing roller is moved from the release position to the attachment position. I am trying.

Therefore, after adjusting the tension of the web in the downstream side section to the proper tension on the downstream side, the intermediate drive roller in the separated position is moved to the contact position, and then the pressing roller is moved from the detached position to the attached position. When the web is nipped by the upstream drive roller and the downstream drive roller and each pressing roller, the tension of the web is already adjusted to the proper downstream tension, and the momentary increase in tension on the web is suppressed, Fracture can be suppressed.

In the web tension adjusting device of the present invention, the control device adjusts the tension of the web in the upstream side section to a preset downstream side tension adjusting upstream side tension, and then controls the web in the downstream side section. When the tension reaches a preset downstream proper tension, the tension of the web in the upstream section is adjusted to the preset upstream proper tension.

Therefore, after adjusting the web tension in the upstream section to the downstream tension adjusting upstream tension, when the web tension in the downstream section reaches the preset proper downstream tension, the web tension in the upstream section Is adjusted to the upstream proper tension, the tension of the web can be increased early to adjust the web tension to the upstream proper tension.

In the web tension adjusting device of the present invention, the control device sets the rotation speed of the upstream drive roller to be lower than the rotation speed of the downstream drive roller, and the tension of the web in the downstream section is appropriate for the downstream side. When the tension is reached, the rotation speed of the upstream drive roller is controlled so that the current tension of the web is maintained.

Therefore, when the rotational speed of the upstream drive roller is set to be lower than the rotational speed of the downstream drive roller and the tension of the web in the downstream section reaches the downstream proper tension, the current web tension is maintained so as to be maintained. Since the rotation speed of the side drive roller is controlled, the tension of the web can be adjusted efficiently.

In the web tension adjusting device of the present invention, the control device adjusts the tension of the web in the downstream section to the downstream proper tension, and then moves the intermediate drive roller in the separated position to the contact position. After that, the tension of the web in the upstream section is adjusted to the upstream proper tension.

Therefore, after adjusting the web tension in the downstream section to the downstream proper tension, the intermediate drive roller in the separated position is moved to the contact position, and then the web tension in the upstream section is adjusted to the upstream proper tension. Therefore, the intermediate drive roller is moved to the contact position while the tension of the web is adjusted to the proper tension on the downstream side, and the breakage of the web can be suppressed.

In the web tension adjusting device of the present invention, the control device starts the drive rotation of the downstream drive roller in a state where the drive rotation of the upstream drive roller is stopped, and the tension of the web in the downstream section. Is increased, the drive rotation of the upstream drive roller is started.

Therefore, when the drive rotation of the upstream drive roller is stopped, the drive rotation of the downstream drive roller is started, and when the tension of the web in the downstream section increases, the drive rotation of the upstream drive roller is started, The looseness of the web can be eliminated early.

In the web tension adjusting device of the present invention, the intermediate drive roller is a pair of blanket cylinders in a printing device, a separation position where a gap is secured between the intermediate drive rollers, and the pair of blanket cylinders. It is movable to a contact position where there is no gap between them, and at least one of the pair of blanket cylinders is in contact with the web when the pair of blanket cylinders is in the separated position.

Therefore, even if at least one of the blanket cylinders is in contact with the web, the tension of the web in the upstream section and the tension of the web in the downstream section can be properly adjusted. As a result, it is possible to improve the workability of the web tension adjustment work.

In the web tension adjusting device of the present invention, a path length changing device capable of changing the path length of the web is provided between the upstream drive roller and the downstream drive roller, and the control device is configured to control the upstream side. It is characterized in that the path length changing device is controlled based on the detection result of the tension detector or the downstream tension detector to adjust the tension of the web.

Therefore, since the path length changing device is controlled based on the detection result of the upstream side tension detector or the downstream side tension detector to adjust the web tension, the rotational speed of the upstream drive roller and the downstream drive roller is controlled. The tension of the web can be adjusted at an early stage by the combination with the method described above.

In the web tension adjusting device of the present invention, a plurality of web tension adjusting sections between the upstream drive roller and the downstream drive roller are provided along the transport direction of the web, and the control device includes the plurality of It is characterized in that the tension of the web is adjusted from the web tension adjustment section on the downstream side in the web conveyance direction of the web tension adjustment section.

Therefore, since the web tension is adjusted from the web tension adjusting section on the downstream side in the web conveying direction among the plurality of web tension adjusting sections, it is already adjusted when adjusting the web tension on the upstream tension adjusting section. The tension of the web can be efficiently adjusted without changing the tension of the web in the downstream tension adjustment section.

In the web tension adjusting device of the present invention, a plurality of web tension adjusting sections between the upstream drive roller and the downstream drive roller are provided along the transport direction of the web, and the control device includes the plurality of It is characterized in that the tension of the web is adjusted from the web tension adjusting section on the upstream side in the web conveying direction of the web tension adjusting section.

Therefore, since the web tension is adjusted from the web tension adjustment section on the upstream side in the web transport direction of the plurality of web tension adjustment sections, it is already adjusted when adjusting the tension on the web in the tension adjustment section on the downstream side. The tension of the web can be efficiently adjusted without changing the tension of the web in the tension adjustment section on the upstream side.

Further, the web tension adjusting method of the present invention includes an upstream drive roller and a downstream drive roller that are arranged at a predetermined interval in the web transport direction and are capable of transporting the web, the upstream drive roller and the downstream drive roller. An intermediate drive roller which is disposed between the side drive roller and is capable of transporting the web, and which detects the tension of the web in an upstream section upstream of the intermediate drive roller in the transport direction of the web. A step of detecting the tension of the web in the downstream section downstream of the intermediate drive roller in the transport direction of the web, and the tension of the web in the upstream section and the tension of the web in the downstream section. And controlling the rotational speed of the upstream drive roller on the basis of the above to adjust the tension of the web.

Therefore, even if there is an intermediate drive roller between the upstream section and the downstream section, the tension of the web in the upstream section and the tension of the web in the downstream section can be properly adjusted. As a result, the tension of the web can be appropriately adjusted, and the workability of the tension adjustment work of the web can be improved.

Further, the printing machine of the present invention includes a paper feeding device that feeds a web, a printing device that prints on the web that is fed from the paper feeding device, and a web that is printed by the printing device. The present invention is characterized by including a folding device that cuts a predetermined folding tab after being longitudinally folded and then cut, and a tension adjusting device for the web.

Therefore, even if there is an intermediate drive roller between the upstream section and the downstream section, the tension of the web in the upstream section and the tension of the web in the downstream section can be properly adjusted. As a result, the tension of the web can be appropriately adjusted, and the workability of the tension adjustment work of the web can be improved.

In the printing machine of the present invention, the paper feeding device includes a plurality of paper feeding units, the printing device includes a plurality of printing devices, and the folding device includes a plurality of printing devices that are printed by the printing device. Is to fold the web vertically and then cut to form a predetermined fold, and the control device presets the tension of the web in all the downstream sections in the plurality of web transport paths. Further, when the downstream side proper tension is adjusted, the intermediate drive roller in the separated position is moved to the contact position.

Therefore, when the tension of all the webs is adjusted to the proper tension on the upstream side, the intermediate drive rollers at the separated position are moved to the contact position, so that the intermediate drive rollers come into contact with all the webs at the same time. Therefore, the breakage of the web can be suppressed.

According to the web tension adjusting device and method and the printing machine of the present invention, the tension of the web can be properly adjusted, and the workability of the tension adjustment work of the web can be improved.

FIG. 1 is a schematic configuration diagram showing a web tension adjusting device of the present embodiment. FIG. 2 is a schematic diagram showing a state in which the printing unit is put in the cylinder. FIG. 3 is a schematic diagram showing a state where the printing unit is unrolled. FIG. 4-1 is a schematic diagram showing the content of the tension adjustment work of the web. FIG. 4-2 is a schematic diagram illustrating a modified example of the web tension adjustment work content. FIG. 5 is a flowchart showing a web tension adjusting operation in the printing unit. FIG. 6 is a flowchart showing a first modification of the web tension adjustment work in the printing unit. FIG. 7 is a flowchart showing a second modification of the web tension adjusting work in the printing unit. FIG. 8 is a schematic configuration diagram showing a modified example of the web tension adjusting device of the present embodiment. FIG. 9 is a flowchart showing a web tension adjusting operation in the web pass unit. FIG. 10 is a timing chart showing the tension adjustment work of the web. FIG. 11 is a timing chart showing a first modified example of the web tension adjustment work. FIG. 12 is a timing chart showing a second modified example of the web tension adjustment work. FIG. 13 is a timing chart showing a third modified example of the web tension adjustment work. FIG. 14 is a flowchart showing the printing work. FIG. 15 is a timing chart showing a modification of the web tension adjusting work. FIG. 16 is a flowchart showing a modified example of the printing work. FIG. 17 is a schematic configuration diagram showing an offset rotary printing press for newspapers. FIG. 18 is a schematic configuration diagram showing a printing unit in a rotary offset printing press for newspapers.

Hereinafter, preferred embodiments of a web tension adjusting device and method and a printing machine according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited to the embodiments, and when there are a plurality of embodiments, the embodiments include combinations of the embodiments.

FIG. 17 is a schematic configuration diagram showing an offset rotary printing press for newspapers.

As shown in FIG. 17, the printing machine according to the present embodiment is a newspaper offset rotary printing machine 10, which includes a paper feeding device R, an infeed device I, a printing device U, a web pass device D, and a folding device. And machine F. The sheet feeding device R has a plurality (seven in the present embodiment) of sheet feeding units R1 to R7, and the infeed device I has a plurality (seven in the present embodiment) of infeed units I1 to I7. And the printing apparatus U includes a plurality (six in the present embodiment) of printing units U1 to U6, and the web path device D includes a plurality (two in the present embodiment) of web path units D1. , D2, and the folding machine F has a plurality (two in this embodiment) of folding units F1 and F2.

Although the printing units U1 to U6 are described as six units, each of the printing units U1 to U6 is capable of performing four-color printing, and is divided into upper and lower units to perform twelve two-color printing units U11, U12, It can be used as U21...U61, U62. Further, although the two folding units F1 and F2 are shown vertically side by side, in reality, the operation side folding unit F1 and the driving side folding unit F2 are arranged side by side in the direction orthogonal to the paper surface. Further, the printing device U is described from two parts, but it is described as being divided into two parts in terms of function, and is actually one device.

In the sheet feeding device R, the sheet feeding units R1 to R7 have substantially the same configuration, have a holding arm that holds three rolls of the web W wound in a roll shape, and rotate the holding arm. The paper roll can be rotated to the paper feed position. In the in-feed device I, the in-feed units I1 to I7 have substantially the same configuration, and by adjusting the tension of the web W fed into each of the printing units U1 to U6 of the printing device U, the web traveling in the printing device U is adjusted. The tension of W is stably maintained at an appropriate value. The tension of the web W from the sheet feeding device R to the infeed device I is performed by a brake device (not shown) provided in each of the sheet feeding units R1 to R7.

In the printing apparatus U, the printing units U1 to U6 are multicolor printing units that can perform double-sided four-color printing. However, each of the printing units U1 to U6 can be divided into upper and lower parts into printing units U11 to U62 that can perform two-sided two-color printing. The printing units U11 to U62 have substantially the same configuration and include an ink supply device, a plate cylinder, a blanket cylinder, and the like. In the printing units U1 to U6, the perimeter (diameter) of the plate cylinder and the perimeter (diameter) of the blanket cylinder are set to be the same. Here, in the printing units U1 to U6, the plate cylinder and the blanket cylinder have the same perimeter (diameter) of the plate cylinder and the perimeter (diameter) of the blanket cylinder. May be 1/2 of the circumference (diameter) of the blanket cylinder.

In the web pass device D, the web pass unit D1 is provided for the printing units U1 to U3, and the web pass unit D2 is provided for the printing units U4 to U6. The web path units D1 and D2 have substantially the same configuration, and a slitter that cuts the web W along the longitudinal direction (the conveyance direction of the web W) at the central portion in the width direction, and a conveyance path of the vertically cut web W are provided. It has a turn bar to be set, a compensator (path length changing device) that can change the path length of the web W, and the like.

Each web W printed by the printing units U1 to U3 is vertically cut by a slitter in the web pass unit D1, the transport path is changed by the turn bar, and the path length is changed by the compensator. Are overlaid on. In addition, each web W printed by the printing units U4 to U6 is vertically cut by a slitter in the web path unit D2, the transport path is changed by the turn bar, and the path length is changed by the compensator. Are superposed in the order of.

In the folder F, the two folding units F1 and F2 are arranged on the operating side and the driving side. When a plurality of webs W1 are superposed and introduced from the web pass unit D1, the folding unit F1 vertically folds the web W1, cuts the web W1 in a predetermined length, and folds the web W1 to form a fold tab. To eject the paper. Further, when a plurality of webs W2 are superposed and introduced from the web path unit D2, the folding unit F2 vertically folds the web W2, laterally cuts the web W2 into a predetermined length, and laterally folds to form a fold tab. , Output as a newspaper.

Here, the printing unit U1 in the printing apparatus U will be described in detail. FIG. 18 is a schematic configuration diagram showing a printing unit in a rotary offset printing press for newspapers.

As shown in FIG. 18, the printing unit U1 is an H-shaped tower unit so that four-color printing can be performed. In the printing unit U1, four stacks 21, 22, 23 and 24 of black, indigo, red and yellow are arranged along the conveyance direction of the web W (direction from bottom to top in FIG. 18). The stacks 21, 22, 23 and 24 are arranged in a symmetrically arranged roller arrangement.

The stacks 21, 22, 23, and 24 are opposed to each other on the left and right, and the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b can face each other across the conveyance path of the web W. , 31b, 32a, 32b, 33a, 33b, 34a, 34b are in contact with the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b. The stacks 21, 22, 23, 24 have ink supply devices 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b for the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b. It is provided. Further, dampening devices 61a, 61b, 62a, 62b, 63a, 63b, 64a, 64b are provided for the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b.

In the web offset rotary printing press 10 for a newspaper according to the present embodiment configured as described above, there is a work for adjusting the tension of the web W as a preparatory work before starting the printing operation. The offset rotary printing press 10 for newspapers is provided with a plurality of drive rollers that can be driven and rotated in a conveyance path of the web W, and a tension detector that posts the tension of the web W in a region between the plurality of drive rollers. ing. Therefore, the tension of the web W is adjusted by increasing or decreasing the rotation speeds of the plurality of drive rollers based on the detection result of the tension detector.

FIG. 1 is a schematic configuration diagram showing a web tension adjusting device of the present embodiment.

As shown in FIG. 1, in the paper feeding device R, the holding arm 101 holds a plurality of (for example, three) webs WR. The web W fed from the winding paper WR is sent to the infeed device I via the guide roller 102, the floating roller 103, the guide roller 104, the tension pickup roller 105, and the guide roller 106. The holding arm 101 is provided with a brake device 107 that brakes the web W fed from the web WR.

The infeed device I receives the web W supplied from the paper feeding device R, and sends the web W to the printing device U via the guide roller 108, the infeed drag roller 109, the paper pressing roller 110, and the tension pickup roller 111. The infeed drag roller 109 can be driven and rotated by a drive motor 112.

As described above, the printing apparatus U includes the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b and the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b, and Double-sided printing is performed on the web W supplied from the feed device I. The blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b and the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b are independently driven by drive motors 113, 114, 115, 116. It can be driven and rotated. The printed web W is sent to the web path device D via the tension pickup roller 117, the exit drag roller 118, the paper pressing roller 119, and the guide roller 120. The outlet drag roller 118 can be driven and rotated by a drive motor 121.

In the web pass device D, the web W supplied from the printing device U is cut by the slitter knife 122 and the slitter drag roller 123 at the central portion in the width direction, and the transport path is changed by the turn bar and the path length is changed by the compensator. To be done. The slitter drag roller 123 can be driven and rotated by a drive motor 124. After that, the web W is sent to the folding machine F via the intermediate drag rollers 125 and 126, the paper pressing rollers 127 and 128, the tension pickup rollers 129 and 130, the triangular plate drag roller 131, and the paper pressing roller 132. The intermediate drag rollers 125 and 126 can be driven and rotated by a drive motor 133, and the triangular plate drag roller 131 can be driven and rotated by a drive motor 134. The paper pressing rollers 127 and 128 may not be provided for the intermediate drag rollers 125 and 126.

The control device 140 can adjust the feeding speed of the web W from the web WR by controlling the brake device 107. In addition, the control device 140 controls the drive motors 112, 113, 114, 115, 116, 121, 124, 133, 134 so that the in-feed drag roller 109, the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b, plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b, outlet drag roller 118, slitter drag roller 123, intermediate drag rollers 125, 126, and triangular plate drag roller 131 can be controlled in rotational speed. it can. Further, the control device 140 receives detection values from the tension pickup rollers 105, 111, 117, 129, 130.

By the way, during the printing operation by the offset rotary printing press 10 for newspapers, the printing apparatus U is in a cylinder insertion state in which the outer peripheral surfaces of the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b are in contact with the front and back of the web W. It is in. On the other hand, at the time of adjusting the tension in the offset rotary printing press 10 for newspapers, the printing device U uses the cylinder removal in which the outer peripheral surfaces of the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b are separated from the front and back of the web W. Is in a state. However, during this tension adjustment work, the outer peripheral surfaces of some of the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b are in contact with the front and back surfaces of the web W.

FIG. 2 is a schematic diagram showing a state in which the printing unit is in the cylinder, and FIG. 3 is a schematic diagram showing a state in which the printing unit is in the cylinder removed.

As shown in FIG. 2, when the printing unit U1 is in the cylinder insertion state, the outer peripheral surfaces of the blanket cylinders 31a, 32a, 33a, 34a and the outer peripheral surfaces of the blanket cylinders 31b, 32b, 33b, 34b face each other across the web W. Touching. The blanket cylinders 31a, 32a, 33a, 34a and the blanket cylinders 31b, 32b, 33b, 34b are arranged vertically offset by a predetermined distance, and when the printing unit U1 is in the cylinder insertion state, the web W is the blanket cylinder 31a. , 31b, 32a, 32b, 33a, 33b, 34a, 34b are wound around a predetermined angle.

On the other hand, as shown in FIG. 3, when the printing unit U1 is in the unrolled state, the outer peripheral surfaces of the blanket cylinders 31a, 32a, 33a, 34a and the outer peripheral surfaces of the blanket cylinders 31b, 32b, 33b, 34b form the web W. And are separated. At this time, the web W in the printing unit U1 is in a linear state along the vertical direction. However, the web W is conveyed from the infeed drag roller 109 and the paper pressing roller 110 via the tension pickup roller 111 between the blanket cylinders 31a and 31b. Here, the tension pickup roller 111 and the blanket cylinders 31a and 31b are arranged so as to be displaced in the horizontal direction. Therefore, when the web W is conveyed from the tension pickup roller 111 between the blanket cylinders 31a and 31b, the web W is wound around the outer peripheral surface of the blanket cylinder 31b by a predetermined angle. Further, when the web W passes through the printing unit U1, it contacts some of the blanket cylinders 32a, 33b, 34a.

When performing the work of adjusting the tension of the web W in the offset rotary printing press 10 for newspapers, between the in-feed drag roller 109 and the exit drag roller 118 in the unrolled state in the section where the printing unit U1 is present. The tension of the web W is adjusted as one section. However, as described above, the printing unit U1 is provided in the section between the infeed drag roller 109 and the exit drag roller 118, and some of the blanket cylinders 31b, 32a, 33b, 34a are in contact with the web W. Therefore, the tension of the web W is different between the upstream side and the downstream side of the printing unit U1, and it becomes difficult to adjust the tension of the web W to an appropriate value. Further, after mounting the printing plates on the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b, the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b and blanket cylinders It is necessary to match the phases of 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b. At this time, normal rotation and reverse rotation are performed, and the web W is loosened or pulled, so that the tension of the web W is in various states.

Therefore, in the present embodiment, the rotation speeds of the in-feed drag roller 109 and the exit drag roller 118 are controlled based on the tension of the web W on the upstream side of the printing unit U1 and the tension of the web W on the downstream side of the printing unit U1. Then, the tension of the web W is adjusted to an appropriate value.

The web tension adjusting device of the present embodiment includes an upstream drive roller and a downstream drive roller that are arranged at a predetermined interval in the web W transport direction and are capable of transporting the web W, an upstream drive roller and a downstream drive roller. An intermediate drive roller that is disposed between the intermediate drive roller and the web W and that can transport the web W; and an upstream tension detector that detects the tension of the web W in an upstream section upstream of the intermediate drive roller in the transport direction of the web W. A downstream tension detector that detects the tension of the web W in the downstream section downstream of the intermediate drive roller in the transport direction of the web W, and an upstream side based on the detection results of the upstream tension detector and the downstream tension detector. And a control device capable of adjusting the rotation speed of the drive roller.

Hereinafter, the web tension adjusting apparatus of the present embodiment will be described in detail. First, the section in which the printing unit U1 is arranged is applied to the web tension adjusting section by the web tension adjusting apparatus of the present embodiment and described. In this case, as shown in FIG. 1, the upstream drive roller is the in-feed drag roller 109, the downstream drive roller is the outlet drag roller 118, and the intermediate drive roller is the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b. , 34a, 34b, the upstream tension detector corresponds to the tension pickup roller 111, the downstream tension detector corresponds to the tension pickup roller 117, and the controller corresponds to the controller 140. The upstream section is a section between the infeed drag roller 109 and the blanket cylinders 31a and 31b, and the downstream section is a section between the blanket cylinders 34a and 34b and the exit drag roller 118. However, a plurality of other rollers such as guide rollers and drive rollers other than the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b may be arranged in the upstream section and the downstream section.

FIG. 4-1 is a schematic diagram showing the content of the web tension adjustment work, and FIG. 5 is a flowchart showing the web tension adjustment work in the printing unit.

As shown in FIGS. 1 and 4A, in the tension adjustment work of the web W, the control by the control device 140 includes (1) paper tension control, (2) low tension application control, (3) paper pressing control, (4) Appropriate tension application control, (5) Slow operation control, and (6) Upstream tension control.

(1) The paper tension control is a control for pulling the downstream side of the web W to eliminate the slack portion after the paper is threaded, and the target tension in the downstream section is Td1 (for example, a value larger than 0). When the rotational speed of the downstream drive roller (exit drag roller 118) is 100%, the speed ratio of the upstream drive roller (infeed drag roller 109) is, for example, 0%, and the printing units (blanket cylinders 31a and 31b). , 32a, 32b, 33a, 33b, 34a, 34b) is, for example, 0%. At this time, the paper pressing rollers 110 and 119 of the in-feed drag roller 109 and the exit drag roller 118 are in the released state.

(2) The low tension application control is control for applying a preset downstream proper low tension to the web W in the downstream section after the paper tension control, and the target tension is Td2 higher than Td1. Then, the speed ratio of the upstream drive roller (infeed drag roller 109) is, for example, 99%, and the speed ratio of the printing units (blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b) is, for example, , 100%, and at this time, the paper feed rollers 110 and 119 of the in-feed drag roller 109 and the exit drag roller 118 are in the released state.

(3) The paper pressing control is a control for holding and holding the web W by the in-feed drag roller 109 and the paper pressing roller 110, the exit drag roller 118 and the paper pressing roller 119 after the low tension application control. That is, the paper pressing rollers 110 and 119 are moved from the releasing position to the loading position. Target tension (downstream proper low tension Td2) of the downstream section, speed ratio of the upstream drive roller (infeed drag roller 109), printing unit (blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b). The speed ratio in) does not change.

(4) The proper tension application control is control for applying a preset downstream proper tension to the web W in the downstream section after the paper pressing control, and the target tension is Td3 which is higher than Td2. The speed ratio of the upstream drive roller (infeed drag roller 109) is, for example, 98%, and the speed ratio of the printing units (blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b) is, for example, , 100%, and at this time, the paper feed rollers 110 and 119 of the in-feed drag roller 109 and the exit drag roller 118 are in a worn state.

(5) The slow operation control is control for maintaining the tension of the web W in the downstream section at the downstream proper tension after the proper tension application control, and the target tension is Td3. The speed ratio of the upstream drive roller (infeed drag roller 109) is N%, and this speed ratio N% is feedback-controlled. Further, the speed ratio of the printing units (blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b) is not changed. At this time, the paper pressing rollers 110 and 119 of the in-feed drag roller 109 and the exit drag roller 118 are in the attached state.

(6) The upstream tension control is a control for applying a preset upstream proper tension to the web W in the upstream section after the slow operation control, and the target tension is Tua higher than Td3. The speed ratio of the upstream drive roller (infeed drag roller 109) is Na% lower than 98%.

The tension adjusting work of the web W by the web tension adjusting device of the present embodiment will be specifically described. As shown in FIGS. 3 and 5, at the start of the tension adjustment work of the web W, the printing unit U1 has the outer peripheral surfaces of the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b. Although it is in the unrolled state, the blanket cylinders 31b, 32a, 33b, 34a have their outer peripheral surfaces in contact with the front and back surfaces of the web W.

In step S11, the control device 140 determines whether the paper threading work has been completed. If it is determined that the paper threading work is not completed (No), this state is maintained. On the other hand, when it is determined that the paper threading work is completed (Yes), the control device 140 determines in step S12 whether the cylinder phase alignment of the printing unit U1 is completed. In the cylinder phase matching work, the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b are rotated slowly, fast, or forwardly or reversely to match the phases. Therefore, the web W between the upper and lower cylinders of the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b that rotates in synchronization with the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b is It can be loose or pulled. If it is determined (No) that the cylinder phase alignment of the printing unit U1 has not been completed, this state is maintained. On the other hand, when it is determined that the cylinder phase alignment of the printing unit U1 is completed (Yes), the paper tensioning operation is started in step S13 and subsequent steps.

In step S14, the control device 140 drives and rotates the downstream drive roller (exit drag roller 118) to perform paper tension control. Then, the slack of the web W is eliminated in the section between the upstream drive roller (infeed drag roller 109) and the downstream drive roller (exit drag roller 118), and tension is generated in the web W. In step S15, the control device 140 determines whether the tension Td of the web W in the downstream section has become equal to or higher than the target tension Td1 (for example, 0). The tension Td of the web W uses the detection result of the tension pickup roller 117. If it is determined that the tension Td of the web W is smaller than the target tension Td1 (No), this state is maintained. On the other hand, if it is determined that the tension Td of the web W is equal to or higher than the target tension Td1 (Yes), then in step S16, the printing unit U1 (blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b). And the upstream drive roller (infeed drag roller 109) is driven to rotate, and the upstream drive roller (infeed drag roller 109) is adjusted to perform low tension application control. Then, the tension of the web W increases in the section between the upstream drive roller (in-feed drag roller 109) and the downstream drive roller (exit drag roller 118).

In step S17, the control device 140 determines whether the tension Td of the web W in the downstream section is equal to or higher than the downstream proper low tension Td2. If it is determined (No) that the tension Td of the web W is smaller than the downstream proper low tension Td2, this state is maintained. On the other hand, when it is determined that the tension Td of the web W is equal to or higher than the downstream proper low tension Td2 (Yes), the paper pressing rollers 110 and 119 are moved from the releasing position to the loading position in step S18. In this case, only the paper pressing roller 110 may be moved from the releasing position to the loading position. Subsequently, in step S19, the control device 140 decelerates the rotational speed of the upstream drive roller (infeed drag roller 109) and performs appropriate tension application control. That is, since the rotation speed of the upstream drive roller (infeed drag roller 109) is set lower than the rotation speed of the downstream drive roller (exit drag roller 118), the upstream drive roller (infeed drag roller 109) is The tension of the web W increases in the section between the downstream drive roller (exit drag roller 118).

However, the proper tension application control in step S19 may increase the rotational speed of the upstream drive roller (infeed drag roller 109) if the downstream proper tension Td3 is lower than the downstream proper low tension Td2. The rotation speed of the upstream drive roller (infeed drag roller 109) is appropriately changed according to the tension Td of the web W and adjusted to an appropriate tension.

In step S20, the control device 140 determines whether the tension Td of the web W in the downstream section has reached the downstream proper tension Td3. Here, when it is determined that the tension Td of the web W is lower than the downstream proper tension Td3 (No), this state is maintained. On the other hand, if it is determined that the tension Td of the web W is the same as the downstream proper tension Td3 (Yes), the tension Td of the web W in the downstream section is maintained at the proper downstream tension Td3 in step S21. Performs dynamic operation control. By performing the loose operation control, the paper tensioning operation is completed in step S22.

As shown in FIGS. 4A and 4B, in step S23, the outer peripheral surfaces of the blanket cylinders 31a, 32a, 33a, 34a and the outer peripheral surfaces of the blanket cylinders 31b, 32b, 33b, 34b are web-printed in the printing unit U1. Insert the body so that W is held in contact. In the newspaper offset rotary printing press 10, the paper feeding device R, the infeed device I, the printing device U, and the web pass device D each have a plurality of units. Therefore, there are a plurality of web transport paths. Therefore, when there are a plurality of web transport paths, the tension Td of the web W becomes the proper downstream tension Td3 in all the web transport paths, and when the paper tensioning operation is completed, the blanket cylinders 31a in all the web transport paths are provided. , 32a, 33a, 34a are preferably inserted in the barrel.

After that, in step S24, the control device 140 further reduces the rotational speed of the upstream drive roller (infeed drag roller 109) to perform upstream tension control. That is, since the rotational speed of the upstream drive roller (infeed drag roller 109) is further reduced with respect to the rotational speed of the downstream drive roller (exit drag roller 118), the upstream drive roller (infeed drag roller 109). The tension of the web W is further increased in the section between the downstream drive roller (exit drag roller 118). The web tension adjusting device of the present embodiment performs the above control, but is not limited thereto. For example, the process of step S23 and the process of step S26 may be performed in reverse or at the same time. When there are a plurality of webs W, the cylinder insertion work is performed after confirming that the paper tensioning operation of the other units is completed.

In step S25, the control device 140 determines whether the tension Tu of the web W in the upstream section has become equal to or higher than the upstream proper tension Tua. The tension Tu of the web W uses the detection result of the tension pickup roller 111. When it is determined that the tension Tu of the web W is smaller than the upstream proper tension Tua (No), this state is maintained. On the other hand, if it is determined that the tension Tu of the web W is equal to or higher than the upstream proper tension Tua (Yes), the tension of the web W in the upstream section is maintained at the upstream proper tension in Step S26, Side tension control is completed. Then, after the printing unit U1 is accelerated in step S27, printing is started in step S28.

In addition, the work of adjusting the tension of the web W by the web tension adjusting device of the present embodiment is not limited to the above-described method. FIG. 4-2 is a schematic diagram showing a modified example of the web tension adjustment work content, FIG. 6 is a flowchart showing a first modified example of the web tension adjustment work in the printing unit, and FIG. It is a flow chart showing the 2nd modification of tension adjustment work. It should be noted that steps having the same functions as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 1 and 4-2, in the tension adjustment work of the web W, the control by the control device 140 includes (1) paper tension control, (2) low tension application control, (3) paper pressing control, (4) Appropriate tension application control, (5) Slow operation control, and (6) Upstream tension control.

(1) The paper tension control is a control for pulling the downstream side of the web W to eliminate the slack portion after the paper is threaded, and the target tension in the upstream section is Tu1 (for example, a value larger than 0).
(2) The low tension application control is a control for applying a preset proper downstream low tension (upstream tension for downstream tension adjustment) to the web W in the upstream section after the paper tension control. The tension is Tu2, which is higher than Tu1.
(3) The paper pressing control is a control for holding and holding the web W by the in-feed drag roller 109 and the paper pressing roller 110, and the exit drag roller 118 and the paper pressing roller 119 after the low tension application control. That is, the paper pressing rollers 110 and 119 are moved from the releasing position to the loading position. It is a target tension of the upstream section (downstream tension adjustment upstream tension Tu2).
(4) The proper tension application control is control for applying a preset downstream proper tension to the web W in the downstream section after the paper pressing control, and the target tension is Td3 higher than Tu2.
(5) The slow operation control is control for maintaining the tension of the web W in the downstream section at the downstream proper tension after the appropriate tension application control, and the target tension is Td3.
(6) The upstream tension control is a control that applies a preset upstream proper tension to the web W in the upstream section after the slow operation control, and the target tension is Tua higher than Td3.

A first modified example of the tension adjustment work for the web W by the tension adjustment device for a web according to the present embodiment will be specifically described.

As shown in FIGS. 3 and 6, in step S11, the control device 140 determines whether the paper threading work is completed. Here, when it is determined that the paper threading work is completed (Yes), the control device 140 determines in step S12 whether the cylinder phase alignment of the printing unit is completed. Here, when it is determined that the cylinder phase alignment of the printing unit is completed (Yes), the paper tensioning operation is started in step S13 and subsequent steps.

In step S14, the control device 140 drives and rotates the downstream drive roller (exit drag roller 118) to perform paper tension control. Then, the looseness of the web W is eliminated in the upstream section and the downstream section, and the tension is generated in the web W. In step S15A, the control device 140 determines whether the tension Tu of the web W in the upstream section has become equal to or higher than the target tension Tu1 (for example, 0). Here, if it is determined that the tension Tu of the web W is the target tension Tu1 or more (Yes), in step S16, the printing unit U1 (blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b). ) And the upstream drive roller (infeed drag roller 109) are driven to rotate, and the upstream drive roller (infeed drag roller 109) is adjusted to perform low tension application control. Then, the tension of the web W increases in the section between the upstream drive roller (in-feed drag roller 109) and the downstream drive roller (exit drag roller 118).

In step S17A, the control device 140 determines whether the tension Tu of the web W in the upstream section has become equal to or higher than the downstream tension adjustment upstream tension Tu2. If it is determined that the tension Tu of the web W is equal to or higher than the downstream tension adjustment upstream tension Tu2 (Yes), the paper pressing rollers 110 and 119 are moved from the detached position to the landed position in step S18. .. Subsequently, in step S19, the control device 140 decelerates the rotational speed of the upstream drive roller (infeed drag roller 109) and performs appropriate tension application control.

In step S20A, the control device 140 determines whether the tension Td of the web W in the downstream section has become equal to or higher than the downstream proper tension Td3. Here, when it is determined that the tension Td of the web W is lower than the downstream proper tension Td3 (No), this state is maintained. On the other hand, when it is determined that the tension Td of the web W is equal to or more than the downstream proper tension Td3 (Yes), in step S21, the slow operation control for maintaining the tension Tu of the web W in the upstream section at the current tension. I do. By performing the loose operation control, the paper tensioning operation is completed in step S22.

As shown in FIGS. 4-2 and 6, in step S23, the outer peripheral surfaces of the blanket cylinders 31a, 32a, 33a, 34a and the outer peripheral surfaces of the blanket cylinders 31b, 32b, 33b, 34b are printed by the printing unit U1. Insert the body with W in contact. After that, in step S24, the control device 140 further reduces the rotational speed of the upstream drive roller (infeed drag roller 109) to perform upstream tension control. In step S25, the control device 140 determines whether the tension Tu of the web W in the upstream section is equal to or higher than the upstream proper tension Tua. When it is determined that the tension Td of the web W is equal to or higher than the upstream proper tension Tua (Yes), the tension of the web W in the upstream section is maintained at the upstream proper tension in step S26. Upstream tension control is completed. Then, after the printing unit U1 is accelerated in step S27, printing is started in step S28.

Further, a second modification of the tension adjusting work of the web W by the tension adjusting device of the present embodiment will be specifically described.

As shown in FIGS. 3 and 7, in step S11, the control device 140 determines whether or not the paper threading work is completed. If it is determined that the paper threading work is not completed (No), this state is maintained. On the other hand, when it is determined that the paper threading work is completed (Yes), the control device 140 determines in step S12 whether the cylinder phase alignment of the printing unit U1 is completed. If it is determined (No) that the cylinder phase alignment of the printing unit U1 has not been completed, this state is maintained. On the other hand, when it is determined that the cylinder phase alignment of the printing unit U1 is completed (Yes), the paper tensioning operation is started in step S13 and subsequent steps.

In step S14, the control device 140 drives and rotates the downstream drive roller (exit drag roller 118) to perform paper tension control. Then, the slack of the web W is eliminated in the section between the upstream drive roller (infeed drag roller 109) and the downstream drive roller (exit drag roller 118), and tension is generated in the web W. In step S15, the control device 140 determines whether the tension Td of the web W in the downstream section has become equal to or higher than the target tension Td1 (for example, 0). If it is determined that the tension Td of the web W is smaller than the target tension Td1 (No), this state is maintained. On the other hand, if it is determined that the tension Td of the web W is equal to or greater than the target tension Td1 (Yes), then in step S16, the printing unit U1 (blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b). And the upstream drive roller (infeed drag roller 109) is driven to rotate, and the upstream drive roller (infeed drag roller 109) is adjusted to perform low tension application control. Then, the tension of the web W increases in the section between the upstream drive roller (in-feed drag roller 109) and the downstream drive roller (exit drag roller 118).

In step S17, the control device 140 determines whether the tension Td of the web W in the downstream section is equal to or higher than the downstream proper low tension Td2. If it is determined (No) that the tension Td of the web W is smaller than the downstream proper low tension Td2, this state is maintained. On the other hand, if it is determined that the tension Td of the web W is equal to or higher than the downstream proper low tension Td2 (Yes), the control device 140 causes the rotation speed of the upstream drive roller (infeed drag roller 109) in step S19. Is decelerated to perform proper tension application control. That is, since the rotation speed of the upstream drive roller (infeed drag roller 109) is set lower than the rotation speed of the downstream drive roller (exit drag roller 118), the upstream drive roller (infeed drag roller 109) is The tension of the web W increases in the section between the downstream drive roller (exit drag roller 118).

In step S20, the control device 140 determines whether the tension Td of the web W in the downstream section has reached the downstream proper tension Td3. Here, when it is determined that the tension Td of the web W is lower than the downstream proper tension Td3 (No), this state is maintained. On the other hand, if it is determined that the tension Td of the web W is the same as the downstream proper tension Td3 (Yes), the tension Td of the web W in the downstream section is maintained at the proper downstream tension Td3 in step S21. Performs dynamic operation control. By performing the loose operation control, the paper tensioning operation is completed in step S22. In step S23, the printing unit U1 inserts the outer peripheral surfaces of the blanket cylinders 31a, 32a, 33a, 34a and the outer peripheral surfaces of the blanket cylinders 31b, 32b, 33b, 34b with the web W in between. Succeedingly, in a step S18, the paper pressing rollers 110 and 119 are moved from the releasing position to the attaching position. In this case, only the paper pressing roller 110 may be moved from the releasing position to the loading position.

By moving the paper pressing rollers 110 and 119 to the landing position after inserting the cylinder, a large tension that momentarily acts on the web W when the paper pressing rollers 110 and 119 are moved to the landing position is relaxed. That is, when the paper pressing rollers 110 and 119 are moved to the landing position in the step between step S17 and step S19, a predetermined tension is secured in the short section between the infeed drag roller 109 and the exit drag roller 118. Then, a large tension is momentarily applied to the web W having a low tension conveyed in this section, and the web W may be damaged. On the other hand, when the paper tensioning operation is completed, the tension Td of the web W reaches the downstream proper tension Td3, and even if the paper pressing rollers 110 and 119 are moved to the landing position after the cylinder insertion, the web W momentarily acts. The large tension that occurs is relieved.

After that, in step S24, the control device 140 further reduces the rotational speed of the upstream drive roller (infeed drag roller 109) to perform upstream tension control. In step S25, the control device 140 determines whether the tension Tu of the web W in the upstream section has become equal to or higher than the upstream proper tension Tua. When it is determined that the tension Tu of the web W is smaller than the upstream proper tension Tua (No), this state is maintained. On the other hand, if it is determined that the tension Td of the web W is equal to or higher than the upstream proper tension Tua (Yes), the tension of the web W in the upstream section is maintained at the upstream proper tension in step S26, and thus the upstream Side tension control is completed. Then, after the printing unit U1 is accelerated in step S27, printing is started in step S28.

In the above-described embodiment, the web tension adjusting device according to the present embodiment is applied to the printing units U1 to U6 of the printing device U, but the present invention is not limited to this configuration. For example, the web tension adjusting device of the present embodiment can be applied to the web pass units D1 and D2 of the web pass device D. FIG. 8 is a schematic configuration diagram showing a third modified example of the web tension adjusting device of the present embodiment, and FIG. 9 is a flowchart showing the web tension adjusting work in the web path unit.

As shown in FIG. 8, in the web pass device D (web pass units D1, D2), the web W supplied from the printing device U (see FIG. 1) is fed to the central portion in the width direction by the slitter knife 122 and the slitter drag roller 123. Then, the transfer path is changed by the turn bar 141, and the path length is changed by the compensators 142 and 143. The slitter drag roller 123 can be driven and rotated by a drive motor 124. After that, the web W is sent to the folding machine F via the intermediate drag rollers 125 and 126, the paper pressing rollers 127 and 128, the tension pickup rollers 129 and 130, the triangular plate drag roller 131, and the paper pressing roller 132. The intermediate drag rollers 125 and 126 can be driven and rotated by a drive motor 133, and the triangular plate drag roller 131 can be driven and rotated by a drive motor 134.

The control device 140 can control the rotation speeds of the slitter drag roller 123, the intermediate drag rollers 125 and 126, and the triangular plate drag roller 131 by controlling the drive motors 124, 133, and 134. Further, the control device 140 receives the detection value (tension of the web W) from the tension pickup rollers 129 and 130. Here, the upstream drive roller is the intermediate drag rollers 125 and 126, and the downstream drive roller is the triangular plate drag roller 131.

The work of adjusting the tension of the web W in the web pass device D will be specifically described. As shown in FIGS. 8 and 9, in step S51, the control device 140 determines whether the paper threading work is completed. If it is determined that the paper threading work is not completed (No), this state is maintained. On the other hand, if it is determined that the paper threading work is completed (Yes), the paper tensioning operation is started in step S52 and subsequent steps.

In step S53, the controller 140 drives and rotates the downstream drive roller (triangular plate drag roller 131) to perform paper tension control. Then, the slack of the web W is eliminated in the section between the upstream drive roller (intermediate drag rollers 125 and 126) and the downstream drive roller (triangular plate drag roller 131), and tension is generated in the web W. In step S54, the control device 140 determines whether the tension Tm of the web W in this section has become equal to or higher than the target tension Tm1 (for example, 0). As the tension Tm of the web W, the detection result of the tension pickup rollers 129 and 130 is used. Here, when it is determined that the tension Tm of the web W is smaller than the target tension Tm1 (No), this state is maintained. On the other hand, if it is determined that the tension Tm of the web W is equal to or higher than the target tension Tm1 (Yes), the upstream drive roller (intermediate drag rollers 125, 126) is driven to rotate in step S55, and the upstream drive roller (intermediate drag roller) The drag rollers 125, 126) are adjusted to perform low tension application control. Then, the tension of the web W increases in the section between the upstream drive roller (intermediate drag rollers 125 and 126) and the downstream drive roller (triangular plate drag roller 131).

In step S56, the control device 140 determines whether the tension Tm of the web W in the section has become equal to or higher than the proper low tension Tm2. Here, if it is determined (No) that the tension Tm of the web W is smaller than the appropriate low tension Tm2, this state is maintained. On the other hand, when it is determined that the tension Tm of the web W is equal to or higher than the proper low tension Tm2 (Yes), the controller 140 decelerates the rotation speed of the upstream drive roller (intermediate drag rollers 125 and 126) in step S57. Then, proper tension application control is performed. That is, since the rotational speed of the upstream drive roller (intermediate drag rollers 125, 126) is set lower than the rotational speed of the downstream drive roller (triangular plate drag roller 131), the rotational speed of the upstream drive roller (intermediate drag rollers 125, 126) is reduced. The tension of the web W increases in the section between the downstream drive roller (triangular plate drag roller 131).

In step S58, the control device 140 determines whether the tension Tm of the web W in the section has reached the proper tension Tm3. If it is determined that the tension Tm of the web W is lower than the proper tension Tm3 (No), the compensators 142 and 143 are controlled in step S59, and then the process proceeds to step S60. That is, first, the current positions of the compensators 142 and 143 are stored. Next, the tension of the web W is increased by moving the compensators 142 and 143 in a direction of increasing the path length of the web W. Then, when the tension Tm of the web W becomes equal to the proper tension Tm3, the movement of the compensators 142 and 143 is stopped. On the other hand, when it is determined that the tension Tm of the web W is the same as the proper tension Tm3 (Yes), the control of the compensators 142 and 143 is not performed in step S59, and the process proceeds to step S60. In step S60, the loose operation control for maintaining the tension Tm of the web W in the section at the proper tension Tm3 is performed. By performing the loose operation control, the paper tensioning operation is completed in step S61. Then, in step S62, the web path device D is accelerated, and in step S63, the compensators 142 and 143 are returned to the positions stored in step S58. Then, in step S64, printing is started. In the present embodiment, not only the control of the rotation speed but also the path length of the web W is increased by the compensators 142 and 143, so that the loose state (slack) of the web W can be shifted to the paper tension state at an early stage.

The process of moving the paper pressing rollers 110 and 119 from the detached position to the landed position by the control device 140 by the intermediate drag rollers 125 and 126 may be performed after the process of step 56 or after the process of step S61. Further, although the upstream drive roller is the intermediate drag rollers 125 and 126 and the downstream drive roller is the triangular plate drag roller 131, the upstream drive roller may be the slitter drag roller 123.

Up to this point, the section in which the printing unit U1 is arranged has been described as being applied to the web tension adjusting section by the web tension adjusting apparatus of the present embodiment. It can be applied to the entire transport section of the web W in the printing machine 10. That is, as shown in FIG. 1, the first section extends from the infeed drag roller 109 to the outlet drag roller 118, the second section extends from the outlet drag roller 118 to the intermediate drag rollers 125 and 126, and the triangular drag roller 131 from the intermediate drag rollers 125 and 126. Is the third section.

In the first section, similarly to the above, the upstream drive roller is the infeed drag roller 109, the downstream drive roller is the outlet drag roller 118, and the intermediate drive roller is the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b. , 34a, 34b, the upstream tension detector corresponds to the tension pickup roller 111, and the downstream tension detector corresponds to the tension pickup roller 117. The upstream section is a section between the infeed drag roller 109 and the blanket cylinders 31a and 31b, and the downstream section is a section between the blanket cylinders 34a and 34b and the exit drag roller 118.

In the second section, the upstream drive roller does not have the outlet drag roller 118, the downstream drive roller has intermediate drag rollers 125 and 126, and the intermediate drive roller does not have the slitter drag roller 123, the upstream tension detector and the downstream tension detector. However, it may be provided separately. The upstream section is a section between the outlet drag roller 118 and the slitter drag roller 123, and the downstream section is a section between the slitter drag roller 123 and the intermediate drag rollers 125 and 126.

In the third section, the upstream drive roller is the intermediate drag rollers 125 and 126, the downstream drive roller is the triangular plate drag roller 131, there is no intermediate drive roller, and the upstream tension detector and the downstream tension detector are tension pickup rollers 129. , 130.

In the web tension adjusting device of the present embodiment, a plurality of web tension adjusting sections (three in the present embodiment) are provided along the conveyance direction of the web W, and the control device 140 controls the plurality of web tension adjusting sections. The tension of the web W is adjusted from the web tension adjustment section on the downstream side in the conveyance direction of the web W. That is, the tension of the web W is adjusted in the order of the third section, the second section, and the first section described above.

10 is a timing chart showing a web tension adjusting work, FIG. 11 is a timing chart showing a first modification of the web tension adjusting work, and FIG. 12 is a timing showing a second modification of the web tension adjusting work. FIG. 13 is a timing chart showing a third modified example of the web tension adjusting work. 10 to 13, the numbers (1) to (6) are used for paper tension control, low tension application control, paper pressing control, proper tension application control, loose operation control, and upstream side tension control, respectively. Applicable

As shown in FIG. 10, the control device 140 executes the paper feed tension control, the in-feed drag control, the outlet drag control, and the intermediate drag control on the upstream side of the first section, and the paper tension control and the low tension control are performed in each control. The tension application control, the paper pressing control, the proper tension application control, the loose operation control, and the upstream side tension control are executed.

First, in the third section, paper tension control and low tension application control in the intermediate drag control are performed. Next, in the second section, paper tension control and low tension application control in the exit drag control are performed. Then, in the first section, paper tension control and low tension application control in in-feed drag control are performed. Finally, the paper tension control and the low tension application control in the paper feeding tension control are executed.

Then, in the intermediate drag control, the outlet drag control, the in-feed drag control, and the paper feeding tension control in all the sections, the paper pressing control, the proper tension application control, the loose operation control, and the upstream tension control are simultaneously performed.

Further, as shown in FIG. 11, the control device 140 continuously executes the intermediate drag control, the outlet drag control, the in-feed drag control, and the paper feed tension control in this order, but the paper tension control and the low tension in the third section. When the application control is completed, the paper tension control and the low tension application control in the second section may be started.

Further, as shown in FIG. 12, the control device 140 executes the intermediate drag control, the outlet drag control, the in-feed drag control, and the paper feed tension control in this order, but when the paper tension control in the third section is completed, the second drag control is performed. Start the paper tension control for the section, and when the paper tension control and the low tension application control are completed in all the sections, perform paper holding control, proper tension application control, slow operation control, and upstream tension control at the same time. May be.

Further, as shown in FIG. 13, the control device 140 continuously performs the intermediate drag control, the outlet drag control, the in-feed drag control, and the paper feed tension control in this order, but when the paper tension control in the third section is completed. Alternatively, the paper tension control of the second section may be started.

Note that the control device 140 may perform control for only a single section or control for combining a plurality of sections, and may be configured by a combination of a plurality of sections excluding some sections, or for a single section only. It may be configured by the control of. Further, in the above description, the first section, the second section, and the third section are sectioned, but the second section and the third section may be combined to form the second section.

Here, the work of adjusting the tension of the web W in the offset rotary printing press 10 for newspapers will be described. FIG. 14 is a flowchart showing the printing work.

As shown in FIGS. 1 and 14, the paper threading operation is performed in step S31, and in step S32, the control device 140 determines whether or not the paper threading operation is completed. If it is determined that the paper threading work is not completed (No), this state is maintained. On the other hand, when it is determined that the paper threading work is completed (Yes), the control device 140 determines in step S33 whether the cylinder phase alignment of the printing unit is completed. Here, if it is determined (No) that the cylinder phase alignment of the printing unit is not completed, this state is maintained. On the other hand, when it is determined that the cylinder phase alignment of the printing unit is completed (Yes), the tension adjustment work of the web W is started in step S35 and subsequent steps.

The control device 140 performs the tension adjustment work of the web W in the order of the third section, the second section, and the first section. Here, in the third section, the tension adjustment work of the web W is performed by the control as described above. Further, in the second section, the tension adjustment work of the web W may be performed by the control as described above, or the tension adjustment work of the web W may be performed by one tension detector. In the third section, the tension pickup rollers 129 and 130 perform the tension adjustment work of the web W.

In step S36, it is determined whether the tension adjustment work of the web W in the third section is completed. Here, when it is determined that the tension adjustment work of the web W in the third section is not completed (No), this state is maintained. On the other hand, if it is determined that the tension adjustment work of the web W in the third section is completed (Yes), it is determined in step S37 whether the tension adjustment work of the web W is completed in the second section. Here, when it is determined that the tension adjustment work of the web W in the second section is not completed (No), this state is maintained. On the other hand, when it is determined that the tension adjustment work of the web W in the second section is completed (Yes), it is determined in step S38 whether the tension adjustment work of the web W in the first section is completed. Here, if it is determined that the tension adjustment work of the web W in the first section is not completed (No), this state is maintained.

On the other hand, if it is determined that the tension adjustment work of the web W in the first section is completed (Yes), it is determined in step S39 whether the tension adjustment work of the web W is completed in all sections. Here, if it is determined that the tension adjustment work of the web W in all the sections is not completed (No), this state is maintained. On the other hand, when it is determined that the tension adjustment work of the web W in all the sections is completed (Yes), the control device 140 causes the printing unit U1 to detect the blanket cylinders 31a, 32a, 33a, and 34a in step S40. Cylinder insertion is performed in which the outer peripheral surface and the outer peripheral surfaces of the blanket cylinders 31b, 32b, 33b, 34b are in contact with each other with the web W interposed therebetween. After that, in step S41, the control device 140 performs the upstream tension adjustment work. Then, in step S42, the control device 140 performs the ink supply amount adjustment work by accelerating operation, and then starts printing in step S43.

In addition, a modified example of the work for adjusting the tension of the web W in the offset rotary printing press 10 for newspapers will be described. FIG. 15 is a timing chart showing a modified example of the web tension adjusting work, and FIG. 16 is a flowchart showing a modified example of the printing work.

The web tension adjusting section according to the modified example of the web tension adjusting apparatus of the present embodiment is the entire conveyance section of the web W in the web offset rotary printing press 10. Here, as shown in FIG. 1, the first section extends from the sheet feeding device R (brake device 107) to the infeed drag roller 109, and the second section extends from the infeed drag roller 109 to the exit drag roller 118, and the exit drag roller 109. The section from 118 to the intermediate drag rollers 125 and 126 is the third section, and the section from the intermediate drag rollers 125 and 126 to the triangular plate drag roller 131 is the fourth section.

In the first section, similarly to the above, the upstream drive roller is the winding paper WR (brake device 107) of the paper feeding device R, the downstream drive roller is the infeed drag roller 109, there is no intermediate drive roller, and the upstream tension is The detector and the downstream tension detector correspond to the tension pickup roller 105.

In the second section, similarly to the above, the upstream drive roller is the infeed drag roller 109, the downstream drive roller is the outlet drag roller 118, and the intermediate drive roller is the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b. , 34a, 34b, the upstream tension detector corresponds to the tension pickup roller 111, and the downstream tension detector corresponds to the tension pickup roller 117. The upstream section is a section between the infeed drag roller 109 and the blanket cylinders 31a and 31b, and the downstream section is a section between the blanket cylinders 34a and 34b and the exit drag roller 118.

In the third section, the upstream drive roller is not the outlet drag roller 118, the downstream drive roller is the intermediate drag rollers 125 and 126, and the intermediate drive roller is not the slitter drag roller 123, the upstream tension detector and the downstream tension detector. However, it may be provided separately. The upstream section is a section between the outlet drag roller 118 and the slitter drag roller 123, and the downstream section is a section between the slitter drag roller 123 and the intermediate drag rollers 125 and 126.

In the fourth section, the upstream drive roller is the intermediate drag rollers 125 and 126, the downstream drive roller is the triangular plate drag roller 131, there is no intermediate drive roller, and the upstream tension detector and the downstream tension detector are tension pickup rollers 129. , 130.

In the web tension adjusting device of the present embodiment, a plurality of web tension adjusting sections (four in the present embodiment) are provided along the conveyance direction of the web W, and the control device 140 controls the web tension adjusting section among the plurality of web tension adjusting sections. The tension of the web W is adjusted from the web tension adjustment section on the upstream side in the conveyance direction of the web W. That is, the tension of the web W is adjusted in the order of the first section, the second section, the third section, and the fourth section described above.

As shown in FIG. 15, the control device 140 executes the paper feed tension control, the in-feed drag control, the outlet drag control, and the intermediate drag control on the upstream side of the first section, and the paper tension control and the low tension control are performed in each control. The tension application control, the paper pressing control, the proper tension application control, the loose operation control, and the upstream side tension control are executed.

First, in the first section, paper tension control and low tension application control in paper feed tension control are performed. In the second section, paper tension control and low tension application control in in-feed drag control are performed. In the third section, paper tension control and low tension application control in the exit drag control are performed. In the fourth section, paper tension control and low tension application control in the intermediate drag control are performed.

Then, the paper pressing control, the proper tension application control, the slow operation control, and the upstream side tension control are simultaneously performed by the paper feed tension control, the in-feed drag control, the outlet drag control, and the intermediate drag control in all the sections. The paper feed tension control, the in-feed drag control, the outlet drag control, and the intermediate drag control by the control device 140 are not limited to those described above, and may be controls as described in FIGS. 11 to 13. ..

As shown in FIGS. 1 and 16, a paper threading operation is performed in step S71, and in step S72, control device 140 determines whether the paper threading operation is completed. If it is determined that the paper threading work is not completed (No), this state is maintained. On the other hand, when it is determined that the paper threading work is completed (Yes), the control device 140 determines in step S73 whether the cylinder phase alignment of the printing unit is completed. Here, if it is determined (No) that the cylinder phase alignment of the printing unit is not completed, this state is maintained. On the other hand, when it is determined that the cylinder phase alignment of the printing unit is completed (Yes), the tension adjustment work of the web W is started in step S75 and subsequent steps.

The control device 140 performs the tension adjustment work of the web W in the order of the first section, the second section, the third section, and the fourth section. Here, in the first section, the tension adjustment work of the web W is performed by the control as described above. In the second section, the tension adjustment work of the web W is performed by the control as described above. In the third section, the tension adjustment work of the web W is performed by the control as described above. In the fourth section, the tension adjustment work of the web W is performed by the control as described above.

In step S76, it is determined whether the tension adjustment work of the web W in the first section is completed. Here, if it is determined that the tension adjustment work of the web W in the first section is not completed (No), this state is maintained. On the other hand, when it is determined that the tension adjustment work of the web W in the first section is completed (Yes), it is determined in step S77 whether the tension adjustment work of the web W in the second section is completed. Here, when it is determined that the tension adjustment work of the web W in the second section is not completed (No), this state is maintained. On the other hand, if it is determined that the tension adjustment work of the web W in the second section is completed (Yes), it is determined in step S78 whether the tension adjustment work of the web W in the third section is completed. Here, when it is determined that the tension adjustment work of the web W in the third section is not completed (No), this state is maintained.

On the other hand, when it is determined that the tension adjustment work of the web W in the third section is completed (Yes), it is determined in step S79 whether the tension adjustment work of the web W in the fourth section is completed. Here, when it is determined that the tension adjustment work of the web W in the fourth section is not completed (No), this state is maintained. On the other hand, if it is determined that the tension adjustment work of the web W in the fourth section is completed (Yes), it is determined in step S80 whether the tension adjustment work of the web W is completed in all sections. Here, if it is determined that the tension adjustment work of the web W in all the sections is not completed (No), this state is maintained. On the other hand, if it is determined that the tension adjustment work of the web W in all the sections is completed (Yes), the control device 140 causes the printing unit U1 to detect the blanket cylinders 31a, 32a, 33a, and 34a in step S81. Cylinder insertion is performed in which the outer peripheral surface and the outer peripheral surfaces of the blanket cylinders 31b, 32b, 33b, 34b are in contact with each other with the web W interposed therebetween. After that, in step S82, the control device 140 performs the ink supply amount adjustment work by accelerating operation, and then starts printing in step S83.

As described above, in the web tension adjusting device of the present embodiment, the in-feed drag roller (upstream drive roller) 109 and the outlet that are arranged at a predetermined interval in the web W transport direction and are capable of transporting the web W are provided. The drag roller (downstream drive roller) 118, the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b arranged between the in-feed drag roller 109 and the outlet drag roller 118, and the web in the upstream section Tension pickup roller (upstream tension detector) 111 for detecting the tension of W, tension pickup roller (downstream tension detector) 117 for detecting the tension of web W in the downstream section, tension pickup roller 111 and tension pickup The controller 140 is capable of adjusting the tension of the web W by controlling the rotation speed of the infeed drag roller 109 based on the detection result of the roller 117.

Therefore, with respect to the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b, the rotational speed of the in-feed drag roller 109 is based on the tension of the web W in the upstream section and the tension of the web W in the downstream section. Is controlled to adjust the tension of the web W, even if there are blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b between the upstream section and the downstream section, the upstream section It is possible to properly adjust the tension of the web W and the tension of the web W in the downstream section. As a result, the tension of the web W can be appropriately adjusted, and the workability of the tension adjustment work of the web W can be improved.

In the web tension adjusting device of the present embodiment, the control device 140 adjusts the tension of the web W in the downstream section to the preset proper downstream tension, and then presets the tension of the web W in the upstream section. Adjust to the proper tension on the upstream side. Therefore, when the tension of the web W is adjusted to the proper tension on the upstream side, the tension of the web W already adjusted to the proper tension on the downstream side is not changed, and the tension of the web W can be efficiently adjusted.

In the web tension adjusting device of the present embodiment, the control device 140 sets the rotation speed of the infeed drag roller 109 to be lower than the rotation speed of the outlet drag roller 118, and the tension of the web W in the downstream section reaches the appropriate downstream tension. Then, the rotation speed of the infeed drag roller 109 is controlled so that the downstream proper tension is maintained. Therefore, the tension of the web W can be easily increased, and when the tension of the web W in the downstream section is adjusted to the proper downstream tension, the proper downstream tension of the infeed drag roller 109 is maintained. Since the rotation speed is controlled, the tension of the web W can be adjusted efficiently.

In the web tension adjusting device of the present embodiment, when the tension of the web W in the downstream side section reaches a preset downstream proper low tension lower than the downstream proper tension, the control device 140 causes the infeed drag roller 109 to move. The rotation speed is changed, for example, decelerated to adjust the tension appropriately. Therefore, the tension of the web W is increased stepwise, and the breakage of the web W due to the rapid increase of the tension can be suppressed.

The web tension adjusting device of the present embodiment is provided with the paper pressing rollers 110 and 119 that hold the web W by contacting at least one of the in-feed drag roller 109 and the outlet drag roller 118, and the control device 140 When the tension of the web W in the downstream section reaches the downstream proper low tension, the paper pressing rollers 110 and 119 are moved from the releasing position to the landing position. Therefore, the tension of the web W increases with the web W being nipped by the in-feed drag roller 109, the exit drag roller 118, and the paper pressing rollers 110 and 119, and the web W is stably supported to support the web W. Can be suppressed.

The web tension adjusting device of the present embodiment is provided with the paper pressing rollers 110 and 119 that hold the web W by contacting at least one of the in-feed drag roller 109 and the outlet drag roller 118, and the control device 140 After adjusting the tension of the web W in the downstream section to the appropriate tension on the downstream side, the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b in the separated position are moved to the contact position, and then the paper The pressing rollers 110 and 119 are moved from the releasing position to the attaching position. Therefore, when the web W is nipped by the in-feed drag roller 109, the exit drag roller 118, and the paper pressing rollers 110 and 119, the tension of the web W is already adjusted to the proper downstream tension, and the instantaneous tension on the web W is increased. Is suppressed and the breakage of the web Q can be suppressed.

In the web tension adjusting device of the present embodiment, the control device 140 adjusts the tension of the web W in the upstream side section to the preset upstream side tension for downstream side tension adjustment, and then the tension of the web W in the downstream side section. Reaches a preset downstream proper tension, the tension of the web W in the upstream section is adjusted to the preset upstream proper tension. Therefore, the tension of the web W can be increased at an early stage to adjust the tension of the web W to the appropriate tension on the upstream side.

In the web tension adjusting device of the present embodiment, the control device 140 sets the rotation speed of the infeed drag roller 109 to be lower than the rotation speed of the outlet drag roller 118, and the tension of the web W in the downstream section reaches the appropriate downstream tension. Then, the rotation speed of the infeed drag roller 109 is controlled so that the current tension of the web W is maintained. Therefore, the tension of the web W can be adjusted efficiently.

In the web tension adjusting device of the present embodiment, the control device 140 adjusts the tension of the web W in the downstream side section to the proper tension on the downstream side, and then the blanket cylinders 31a, 31b, 32a, 32b, 33a at the separated positions, 33b, 34a, 34b are moved to the contact position, and then the tension of the web in the upstream section is adjusted to the upstream proper tension. Therefore, the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b are moved to the contact position in a state where the tension of the web W is adjusted to the proper tension on the downstream side, so that the web W is not broken. Can be suppressed.

In the web tension adjusting device of the present embodiment, the control device 140 starts the driving rotation of the outlet drag roller 118 while the driving rotation of the in-feed drag roller 109 is stopped, and the tension of the web W in the downstream section increases. Then, the driving rotation of the in-feed drag roller 109 is started. Therefore, the slack of the web W can be eliminated early.

In the web tension adjusting device of the present embodiment, when the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b are in the separated position, some of the blanket cylinders 31a, 32b, 33a, 34b are used as the web W. To contact. Therefore, even if some of the blanket cylinders 31a, 32b, 33a, 34b are in contact with the web W, the tension of the web W in the upstream section and the tension of the web W in the downstream section can be properly adjusted. As a result, the workability of adjusting the tension of the web W can be improved.

In the web tension adjusting device of the present embodiment, compensators 142 and 143 capable of changing the path length of the web W are provided between the intermediate drag rollers 125 and 126 and the triangular plate drag roller 131, and the control device 140 sets the tension pickup rollers 129 and 126. Based on the detection result of 130, the compensators 142 and 143 are controlled to adjust the tension of the web W. Therefore, the tension of the web W can be adjusted at an early stage in combination with the method of controlling the rotation speeds of the intermediate drag rollers 125 and 126 and the triangular plate drag roller 131.

In the web tension adjusting device of the present embodiment, a plurality of tension adjusting sections of the web W are provided along the conveying direction of the web W, and the controller 140 controls the conveying direction of the web W among the tension adjusting sections of the plurality of webs W. The tension of the web W is adjusted from the tension adjustment section of the web W on the downstream side in the above. Therefore, when adjusting the tension of the web W in the tension adjustment section on the upstream side, it is possible to adjust the tension of the web W efficiently without changing the tension of the web W in the tension adjustment section on the downstream side that has already been adjusted. You can

In the web tension adjusting device of the present embodiment, a plurality of tension adjusting sections of the web W are provided along the conveying direction of the web W, and the controller 140 controls the conveying direction of the web W among the tension adjusting sections of the plurality of webs W. The tension of the web W is adjusted from the tension adjustment section of the web W on the upstream side in. Therefore, when adjusting the tension of the web W in the tension adjustment section on the downstream side, it is possible to adjust the tension of the web W efficiently without changing the tension of the web W in the tension adjustment section on the upstream side that has already been adjusted. You can

Further, in the tension adjusting method of the present embodiment, the step of detecting the tension of the web W in the upstream section, the step of detecting the tension of the web W in the downstream section, and the tension of the web W in the upstream section. And adjusting the tension of the web W by controlling the rotation speed of the in-feed drag roller 109 based on the tension of the web W in the downstream section. Therefore, even if there are blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b between the upstream section and the downstream section, the tension of the web W in the upstream section and the web W in the downstream section. The tension of can be adjusted appropriately. As a result, the tension of the web W can be appropriately adjusted, and the workability of the tension adjustment work of the web W can be improved.

Further, in the printing machine of the present embodiment, the paper feeding device R for supplying the web W, the printing device U for printing the web W supplied from the paper feeding device R, and the printing by the printing device U A folding machine F for longitudinally folding the web W having been subjected to the cutting and then cutting it to form a predetermined signature, and a tension adjusting device for the web W are provided. Therefore, the tension of the web W can be properly adjusted, and the workability of the tension adjustment work of the web W can be improved.

In the printing machine of the present embodiment, the paper feeding device R has a plurality of paper feeding units R1 to R7, the printing device U has a plurality of printing units U1 to U6, and the folder F has a plurality of webs. W is longitudinally folded and then cut to form a predetermined fold, and the control device 140 adjusts the tension of the web W in all the downstream sections in the transport path of the plurality of webs W to the proper downstream tension. Then, the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b in the separated position are moved to the contact position. Therefore, the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b come into contact with all the webs W at the same time, and the breakage of the webs W can be suppressed.

Further, the tension of the web W is adjusted to the proper tension on the downstream side at an early stage, and the cylinder insertion is performed while the tension on the downstream side is established. Therefore, stable printing can be realized from the start of printing, and the waste paper is reduced. (Black loss can be reduced). Further, since the paper tensioning is completed at the low speed operation, the speed of the web W at the time of putting in the cylinder can be reduced, and the waste paper can be reduced (white loss can be reduced). Further, since the paper tensioning operation can be performed automatically, the skill of the worker who monitors the tension of the web W and operates is not required, and the skilllessness of the worker and the automatic unmanned operation at the start of printing can be realized. it can.

In the above-described embodiment, the upstream drive roller, the downstream drive roller, the intermediate drive roller, the upstream tension detector, and the downstream tension detector are arranged in appropriate places, but the web tension adjusting device has this configuration. The present invention is not limited to this, and for example, the web conveying path may be divided into two or four or more, and the respective constituent members may be arranged at appropriate places.

Further, in the above-described embodiment, the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b are arranged as the intermediate drive rollers between the upstream section and the downstream section, but the configuration is not limited to this. Instead of the blanket cylinder, a plurality of other rollers such as a guide roller and a driving roller other than the blanket cylinder may be arranged in the upstream section and the downstream section.

Further, in the above-described embodiment, the upstream tension detector and the downstream tension detector are tension pickup rollers, but the present invention is not limited to this configuration, and if the tension of the web can be detected, a dancer roller or the like, Any tension detector may be used.

Further, in the above-described embodiment, the printing machine of the present invention is described as being applied to an offset rotary printing machine for newspapers, but may be applied to other printing machines that use a web, such as a commercial rotary offset printing machine. A double-sided printing machine or a single-sided printing machine may be used.

R paper feeding device R1 to R7 paper feeding unit I infeed device I1 to I7 infeed unit U printing device U1 to U6, U11 to U62 printing unit D web pass device D1, D2 web pass unit F folding device F1, F2 folding unit 21, 22, 23, 24 stacks 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b blanket cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b plate cylinders 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b Ink supply device 61a, 61b, 62a, 62b, 63a, 63b, 64a, 64b Damping device 101 Holding arm 102 Guide roller 103 Floating roller 104 Guide roller 105 Tension pickup roller 106 Guide roller 107 Brake device 108 Guide Roller 109 Infeed Drag Roller 110 Paper Pressing Roller 111 Tension Pickup Roller 112 Drive Motor 113, 114, 115, 116 Drive Motor 117 Tension Pickup Roller 118 Outlet Drag Roller 119 Paper Pressing Roller 120 Guide Roller 121 Drive Motor 122 Slitter Knife 123 Slitter Drag roller 124 Drive motor 125,126 Intermediate drag roller 127,128 Paper pressing roller 129,130 Tension pickup roller 131 Triangular plate drag roller 132 Paper pressing roller 133 Drive motor 134 Drive motor 140 Control device 141 Turn bar 142,143 Compensator (path length changing device)
WR Web W Paper

Claims (17)

An upstream drive roller and a downstream drive roller that are arranged at a predetermined interval in the web transport direction and are capable of transporting the web;
An intermediate drive roller that is arranged between the upstream drive roller and the downstream drive roller and is capable of transporting the web;
An upstream tension detector that detects the tension of the web in the upstream section on the upstream side in the transport direction of the web from the intermediate drive roller,
A downstream tension detector that detects the tension of the web in a downstream section on the downstream side in the transport direction of the web from the intermediate drive roller,
A control device capable of adjusting the tension of the web by controlling the rotation speed of the upstream drive roller based on the detection results of the upstream tension detector and the downstream tension detector,
A tension adjusting device for a web, comprising: The controller adjusts the tension of the web in the downstream section to a preset downstream proper tension, and then adjusts the web tension in the upstream section to a preset upstream proper tension. The web tension adjusting device according to claim 1. The control device sets the rotation speed of the upstream drive roller to be lower than the rotation speed of the downstream drive roller, and when the tension of the web in the downstream section reaches the downstream proper tension, the downstream proper tension. The web tension adjusting device according to claim 2, wherein the rotational speed of the upstream drive roller is controlled so that When the tension of the web in the downstream section reaches a preset downstream proper low tension lower than the downstream proper tension, the control device changes the rotation speed of the upstream drive roller to the proper tension. The web tension adjusting device according to claim 2, wherein the tension adjusting device adjusts the web tension. A pressing roller that clamps the web by contacting at least one of the upstream drive roller and the downstream drive roller is provided, and the controller is configured such that the tension of the web in the downstream section is the downstream side. The web tension adjusting device according to claim 4, wherein when the proper low tension is reached, the pressing roller is moved from the releasing position to the loading position. A pressing roller that clamps the web by contacting at least one of the upstream drive roller and the downstream drive roller is provided, and the controller controls the tension of the web in the downstream section to the downstream side. 5. After adjusting to an appropriate tension, the intermediate drive roller in the separated position is moved to the contact position, and then the pressing roller is moved from the detached position to the attached position. The tension adjusting device for a web according to any one of claims. The controller adjusts the tension of the web in the upstream section to a preset downstream tension for upstream tension adjustment, and then adjusts the tension of the web in the downstream section to a preset proper downstream tension. The tension adjusting device for a web according to claim 1, wherein the tension of the web in the upstream section is adjusted to a preset upstream proper tension when the pressure reaches. The control device sets the rotation speed of the upstream drive roller to be lower than the rotation speed of the downstream drive roller, and when the tension of the web in the downstream section reaches the downstream proper tension, the current web The web tension adjusting device according to claim 7, wherein the rotation speed of the upstream drive roller is controlled so that the tension is maintained. The control device adjusts the tension of the web in the downstream section to the appropriate tension on the downstream side, then moves the intermediate drive roller in the separated position to the contact position, and then the web in the upstream section. 9. The tension adjusting device for a web according to claim 2, wherein the tension of the web is adjusted to the appropriate tension on the upstream side. The control device starts the drive rotation of the downstream drive roller in a state where the drive rotation of the upstream drive roller is stopped, and when the tension of the web in the downstream section increases, 10. The web tension adjusting device according to claim 1, wherein driving rotation is started. The intermediate drive roller is a pair of blanket cylinders in the printing apparatus, and a separated position where a gap is secured between the pair of blanket cylinders, and a contact position where there is no gap between the pair of blanket cylinders. 11. At least one of the pair of blanket cylinders contacts the web when the pair of blanket cylinders are in the spaced position. A web tension adjusting device according to. A path length changing device capable of changing the path length of the web is provided between the upstream drive roller and the downstream drive roller, and the control device includes the upstream tension detector or the downstream tension detector. The tension adjusting device for a web according to any one of claims 1 to 11, wherein the tension of the web is adjusted by controlling the path length changing device based on a detection result of the above. A plurality of web tension adjustment sections between the upstream drive roller and the downstream drive roller are provided along the transport direction of the web, and the control device controls the web tension adjustment section for the web among the plurality of web tension adjustment sections. The web tension adjusting device according to any one of claims 1 to 12, wherein the tension of the web is adjusted from the web tension adjusting section on the downstream side in the transport direction. A plurality of web tension adjustment sections between the upstream drive roller and the downstream drive roller are provided along the transport direction of the web, and the control device controls the web tension adjustment section for the web among the plurality of web tension adjustment sections. The web tension adjusting device according to any one of claims 1 to 12, wherein the tension of the web is adjusted from the web tension adjusting section on the upstream side in the transport direction. An upstream drive roller and a downstream drive roller that are arranged at a predetermined interval in the web transport direction and are capable of transporting the web;
An intermediate drive roller that is arranged between the upstream drive roller and the downstream drive roller and is capable of transporting the web;
Equipped with
Detecting the tension of the web in an upstream section on the upstream side in the transport direction of the web from the intermediate drive roller,
Detecting the tension of the web in a downstream section on the downstream side in the transport direction of the web from the intermediate drive roller,
Adjusting the tension of the web by controlling the rotation speed of the upstream drive roller based on the tension of the web in the upstream section and the tension of the web in the downstream section;
A method for adjusting tension of a web, comprising: A paper feeding device for feeding the web,
A printing device for performing printing on the web supplied from the paper feeding device;
A folding device that longitudinally folds the web printed by the printing device and then cuts the web to form a predetermined folding tab,
A web tension adjusting device according to any one of claims 1 to 14,
A printing machine comprising: The paper feeding device has a plurality of paper feeding units, the printing device has a plurality of printing devices, and the folding device vertically folds the plurality of webs printed by the printing device. After that, the sheet is cut to form a predetermined fold, and the control device adjusts the tension of the web in all the downstream sections in the transport paths of the plurality of webs to a preset proper downstream tension. 17. The printing press according to claim 16, wherein the intermediate drive roller in the separated position is moved to the contact position when the separation is performed.

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