JP7304297B2 - PRINTING DEVICE, ROTARY PRINTING MACHINE, AND PLATE CHANGE METHOD - Google Patents

Description

The present disclosure relates to a printing apparatus having a plurality of printing cylinders, a rotary printing press having the printing apparatus, and a plate changing method.

For example, a newspaper offset rotary press consists of a feeder, a printer, a web path, and a folder. The printing device has a plurality of printing units, and each printing unit prints on a corresponding web. The printing unit includes an ink supply source, an ink supply device that supplies ink using a plurality of rollers, a plate cylinder on which a printing plate is mounted, and a flanket cylinder that transfers ink (image) to printing paper. .

Before starting printing, a newspaper offset rotary printing press performs a web threading operation in which a web drawn out from a roll of paper supported by a paper feeding device is led through a printing device and a web path device to a folding machine. When the paper threading work is completed, next, the plate replacement work for each plate cylinder is carried out in each printing unit of the printing apparatus. In the printing unit, a plurality of printing plates are produced according to the printed matter, and printing is carried out by mounting a predetermined printing plate necessary for printing on each plate cylinder. Therefore, for example, after a predetermined number of copies of Newspaper A have been printed, plates are changed in order to print Newspaper B next.

For example, Japanese Patent Laid-Open No. 2002-100001 discloses a device for efficiently performing paper threading and plate replacement work before starting printing. The rotary printing press described in Patent Document 1 specifies the existence of the web passed through the printing unit, holds the web and the blanket cylinder in a non-contact state, and the tip of the web through which the paper is passed While maintaining a paper threading speed that does not apply tension, plate replacement work is performed.

Japanese Patent No. 5134275

In the above-described conventional rotary printing press, the web and the blanket cylinder are kept in a non-contact state, and plate changing work and the like are performed while maintaining a paper threading speed at which no tension is applied to the leading end of the web to be threaded. However, when trying to replace the plate while maintaining the paper threading speed, it is necessary to continue conveying the web until the plate replacement of all the printing units is completed, resulting in an increase in wasted paper. Also, if the web contacts the blanket cylinder without tension on the web, the web will wrap around the rotating blanket cylinder. Therefore, the plate replacement work cannot be performed unless the paper threading work of each printing unit is completed and the paper is placed in the folding machine. In recent years, there has been a demand for more efficient printing work, and there is a demand for shortening the above-described printing preparation work.

An object of the present disclosure is to solve the above-described problems, and to provide a printing apparatus, a rotary printing press, and a plate changing method for shortening the print preparation work.

A printing apparatus according to the present disclosure for achieving the above object comprises a pair of printing cylinders arranged to sandwich a web, and an upstream drive roller arranged upstream of the pair of printing cylinders in the direction in which the web is conveyed. and a downstream drive roller arranged downstream of the pair of printing cylinders in the web conveying direction, and a tension adjustment for adjusting the tension of the web between the upstream drive roller and the downstream drive roller. a device, a first web position detector for detecting that the downstream end of the web in the conveying direction has passed the downstream drive roller during the paper threading operation, and the first web position detector being conveyed. a control device that, upon detection of the downstream end of the web, adjusts the tension of the web to a preset predetermined tension by the tension adjusting device, and then stops conveying the web.

Further, the rotary printing press of the present disclosure includes a paper feeding device that supplies a web, the printing device, and the web printed by the printing device, which is vertically folded and then cut to form a predetermined signature. and a folding device.

Further, the plate changing method of the present disclosure includes the steps of conveying the web in a state in which at least one of a pair of printing cylinders sandwiching the web is separated from the web, and a downstream end of the web in the conveying direction. a step of detecting that the web has passed a downstream drive roller located downstream of the pair of printing cylinders in the conveying direction of the web; a step of adjusting the tension of the web to a preset predetermined tension; a step of stopping the conveyance of the web when the tension of the web is adjusted to the predetermined tension; and a step of changing the plate when the conveyance of the web is stopped. and performing.

According to the printing apparatus, the rotary printing press, and the plate changing method of the present disclosure, the print preparation work can be shortened.

FIG. 1 is a schematic configuration diagram showing the printing apparatus of the first embodiment. FIG. 2 is a schematic diagram showing the throw-on state of the printing unit. FIG. 3 is a schematic diagram showing the unthrown state of the printing unit. FIG. 4 is a schematic diagram showing a paper threading device. FIG. 5 is a perspective view showing the essential parts of the paper threading device. FIG. 6 is a flow chart showing control of the printing apparatus of the first embodiment. FIG. 7 is a time chart representing control of the printing apparatus according to the first embodiment. FIG. 8 is a schematic configuration diagram showing a newspaper offset rotary printing press. FIG. 9 is a schematic configuration diagram showing a printing unit in an offset rotary printing press for newspapers. FIG. 10 is a flow chart showing control of the printing apparatus of the second embodiment. FIG. 11 is a time chart representing control of the printing apparatus of the second embodiment. FIG. 12 is a flow chart showing control of the printing apparatus of the third embodiment. FIG. 13 is a time chart representing control of the printing apparatus of the third embodiment.

Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. It should be noted that the present disclosure is not limited by this embodiment, and when there are a plurality of embodiments, the present disclosure also includes a combination of each embodiment. In addition, components in the embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range.

[First embodiment]
In the first embodiment, a printing apparatus and a rotary printing press according to the present disclosure will be described by applying them to an offset rotary printing press for newspapers.

［Offset web press for newspapers］

FIG. 8 is a schematic configuration diagram showing a newspaper offset rotary printing press. The offset rotary press for newspapers is a 4×1 rotary press in which the size of the plate cylinder of the printing device is set to 4 page widths×1 page circumference.

In the first embodiment, as shown in FIG. 8, a newspaper offset rotary printing press 10 includes a paper feeding device R, an infeed device I, a printing device U, a web path device D, and a folding machine F. Prepare. The paper feeder R has a plurality of (seven in this embodiment) paper feed units R1 to R7. The infeed device I has a plurality of (seven in this embodiment) infeed units I1 to I7. The printing apparatus U has a plurality (six units in this embodiment) of printing units U1 to U6. The web pass device D has a plurality of (two in this embodiment) web pass units D1 and D2. The folding machine F has a plurality of (two in this embodiment) folding units F1 and F2.

Although six printing units U1 to U6 have been described, each of the printing units U1 to U6 is capable of four-color printing, and can be divided vertically into twelve printing units U11, U12, U21 . . . U61, U62 can be used. Also, although the two folding units F1 and F2 are arranged vertically, they are actually the operating side folding unit F1 and the drive side folding unit F2 arranged side by side in the direction orthogonal to the plane of the drawing. Furthermore, although the printing apparatus U has been described from two parts, it is only described as being divided into two parts for functional reasons, and in reality it is one apparatus.

In the paper feeder R, the paper feed units R1 to R7 have substantially the same configuration and have holding arms for holding three paper rolls on which the web W is rolled. By rotating the holding arm, the paper roll can be rotated to the paper feeding position. In the infeed device I, the infeed units I1 to I7 have substantially the same configuration and adjust the tension of the web W to be sent to the printing units U1 to U6 of the printing device U. As shown in FIG. As a result, the tension of the web W traveling in the printing apparatus U can be stably maintained at an appropriate value. The tension of the web W from the sheet feeding device R to the infeed device I is applied by braking devices provided in the sheet feeding units R1 to R7, which will be described later.

In the printing apparatus U, the printing units U1 to U6 are multi-color printing units capable of performing two-sided four-color printing. However, each of the printing units U1 to U6 can be divided into upper and lower printing units U11 to U62 capable of double-sided two-color printing. The printing units U11 to U62 have substantially the same configuration and have ink supply devices, plate cylinders, blanket cylinders, and the like. In this embodiment, each of the printing units U1 to U6 has a plate cylinder whose circumference is set to the vertical length of one page of a newspaper (printed matter), and a blanket cylinder whose circumference is an integral multiple of the plate cylinder circumference. set. In each of the printing units U1 to U6, the circumferential length (diameter) of the plate cylinder and the circumferential length (diameter) of the blanket cylinder may be set to be the same.

In the web path device D, the web path unit D1 is provided for the printing units U1-U3, and the web path unit D2 is provided for the printing units U4-U6. The web pass units D1 and D2 have substantially the same configuration, and serve as a slitter for cutting the web W in the longitudinal direction (conveying direction of the web W) at the central portion in the width direction, and a conveying path for the longitudinally cut web W. It has a turn bar for setting, a compensator for adjusting the conveying position of the web W in the vertical and longitudinal directions, and the like.

Each web W printed by the printing units U1 to U3 is vertically cut by the slitter in the web pass unit D1, the conveying path is changed by the turn bar, and the conveying position is adjusted by the compensator. superimposed. Each web W printed by the printing units U4 to U6 is longitudinally cut by the slitter in the web pass unit D2, the conveying path is changed by the turn bar, and the conveying position is adjusted by the compensator. superimposed in order.

In the folding machine F, two folding units F1 and F2 are arranged on the operating side and the driving side. When a plurality of webs W1 are superimposed and introduced from the web pass unit D1, the folding unit F1 vertically folds the webs W1 with a triangular plate, horizontally cuts them to a predetermined length, and horizontally folds them to form signatures. , as a newspaper. Further, when a plurality of webs W2 are superimposed and introduced from the web path unit D2, the folding unit F2 vertically folds the webs W2, horizontally cuts them to a predetermined length, and horizontally folds them to form signatures. , as a newspaper.

[Print unit]
Here, the printing unit U1 in the printing apparatus U will be described in detail. The printing units U2 to U6 have the same configuration, and the description thereof is omitted. FIG. 9 is a schematic configuration diagram showing a printing unit in an offset rotary printing press for newspapers.

As shown in FIG. 9, the printing unit U1 is an H-shaped tower unit so as to enable four-color printing. In the printing unit U1, four stacks 21, 22, 23, and 24 for black, indigo, magenta, and yellow are arranged along the transport direction of the web W (the direction from bottom to top in FIG. 9). Configured. The stacks 21, 22, 23, and 24 each have a symmetrical roller arrangement.

The stacks 21 , 22 , 23 , 24 are laterally opposed to each other, and the blanket cylinders 31 a , 31 b , 32 a , 32 b , 33 a , 33 b , 34 a , 34 b can contact with each other with the transport path of the web W interposed therebetween. Blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b are in contact with plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, and 44b. The stacks 21, 22, 23, 24 are provided with ink supply devices 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b for plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b. be provided. Dampening devices 61a, 61b, 62a, 62b, 63a, 63b, 64a and 64b are provided for the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a and 44b.

[Schematic Configuration of Printing Device]
FIG. 1 is a schematic configuration diagram showing the printing apparatus of the first embodiment.

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

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

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

The web pass device D cuts the web W supplied from the printing device U at the center in the width direction by the slitter knife 122 and the slitter drag roller 123, changes the conveying path by the turn bar 124, and compensators 125 and 126 Path length is changed. The slitter drag roller 123 can be driven and rotated by a drive motor 127 . After that, the web W is sent to the folding machine F via the intermediate drag rollers 128 and 129, the paper pressure rollers 130 and 131, the tension pickup rollers 132 and 133, the triangular plate drag roller 134 and the paper pressure roller 135. The intermediate drag rollers 128 and 129 can be driven to rotate by a drive motor 136 , and the triangular plate drag roller 134 can be driven to rotate by a drive motor 137 . Note that the paper pressing rollers 130 and 131 may not be provided for the intermediate drag rollers 128 and 129 .

The control device 140 can adjust the delivery speed of the web W from the paper roll WR by controlling the brake device 107 . Further, the control device 140 controls the drive motors 112, 113, 114, 115, 116, 121, 127, 136, 137 to control the infeed 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 128, 129, and triangular plate drag roller 134 can be controlled. can. Furthermore, the controller 140 receives detection values from the tension pickup rollers 105 , 111 , 117 , 132 and 133 .

During the printing operation of the newspaper offset rotary printing press 10, the printing apparatus U is in a throw-on state in which the outer peripheral surfaces of the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b are in contact with the front and back sides of the web W. . On the other hand, during the paper threading operation in the newspaper offset rotary printing press 10, the printing apparatus U causes the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b to separate from the front and back surfaces of the web W. It is in a state of undressing.

FIG. 2 is a schematic diagram showing a throw-on state of the printing unit, and FIG. 3 is a schematic diagram showing a throw-off state of the printing unit.

As shown in FIG. 2, in the throw-on state of the printing unit U1, the outer peripheral surfaces of the blanket cylinders 31a, 32a, 33a, and 34a and the outer peripheral surfaces of the blanket cylinders 31b, 32b, 33b, and 34b face each other with the web W therebetween. in contact with The blanket cylinders 31a, 32a, 33a, 34a and the blanket cylinders 31b, 32b, 33b, 34b are arranged with a predetermined distance in the vertical direction. , 31b, 32a, 32b, 33a, 33b, 34a, and 34b at a predetermined angle.

On the other hand, as shown in FIG. 3, in the unthrown state of the printing unit U1, the outer peripheral surfaces of the blanket cylinders 31a, 32a, 33a, and 34a and the outer peripheral surfaces of the blanket cylinders 31b, 32b, 33b, and 34b are positioned between the web W. and separated. At this time, the web W in the printing unit U1 is straight in the vertical direction. However, the web W is conveyed between the blanket cylinders 31a and 31b from the infeed drag roller 109 and the paper pressure roller 110 via the tension pickup roller 111. As shown in FIG. Here, the tension pickup roller 111 and the blanket cylinders 31a and 31b are arranged with a horizontal shift. Therefore, when the web W is transported from the tension pickup roller 111 between the blanket cylinders 31a and 31b, the web W is wrapped around the outer peripheral surface of the blanket cylinder 31b at a predetermined angle. Also, when the web W passes through the printing unit U1, it contacts some of the blanket cylinders 32a, 33b, and 34a.

A paper threading operation in the newspaper offset rotary printing press 10 is performed using a paper threading device. FIG. 4 is a schematic diagram showing a paper threading device, and FIG. 5 is a perspective view showing a main part of the paper threading device.

As shown in FIGS. 4 and 5, a travel route (paper threading route) along which the web W travels is set in advance according to the printing mode. The paper threading device 200 guides the web W supported by the paper feeding unit R1 of the paper feeding device R to the infeed device I, the printing device U, the web path device D, and the folding machine F so as to pass along the running path. be.

The paper threading device 200 includes a guide rail 201 attached along a travel path from the paper feeding device R to the folding machine F, a traveling body 202 movable along the guide rail 201, and a drive for moving the traveling body 202. device 203;

The guide rail 201 has a leading end 201a arranged near the paper roll WR at the paper feeding position of the paper feeding device R. As shown in FIG. A first guide rail 201b is arranged from the starting end 201a through the infeed device I to the printing device U (printing unit U1). A second guide rail 201c is arranged continuously from the exit of the printing device U to the slitter drag roller 123 in the web path device D. As shown in FIG. Two third guide rails 201d and 201e are arranged from the slitter drag roller 123 to the folder F. That is, the web W sent from the paper feeding device R passes through the infeed device I and the printing device U (printing unit U1), reaches the web path device D, is longitudinally cut by the slitter drag roller 123, and is then cut by the turn bar 124. are branched into two traveling paths by the , and sent to the folding machine F to be overlapped.

In the guide rail 201, two third guide rails 201d and 201e join just before the folding machine F to form one fourth guide rail 201f. A downstream end (outlet) 201g of the guide rail 201 is arranged on the downstream side of the folding machine F. As shown in FIG.

As for the guide rail 201, first and second guide rails 201b and 201c from the sheet feeding device R to the slitter drag roller 123 of the web path device D are arranged on both sides of the traveling path. As for the guide rails 201, the third guide rails 201d and 201e from the slitter drag roller 123 of the web path device D to the folding machine F and the fourth guide rail 201f of the folding machine F are arranged only on one side of the traveling path. be.

The traveling body 202 is a flexible strip-shaped plate member, and is movable along the guide rails 201 . The traveling body 202 is inserted into the starting end 201a of the guide rail 201 of the paper feeding device R before the paper threading operation, and discharged from the downstream end 201g of the folding machine F after the paper threading operation. The drive device 203 has a drive motor, and a drive roller meshes with the traveling body 202 . By rotating the drive roller with the drive motor, the traveling body 202 can be moved along the guide rail 201 .

A plurality of drive devices 203 are arranged at predetermined intervals along the longitudinal direction of the guide rail 201 , and the arrangement interval of the drive devices 203 is shorter than the length of the traveling body 202 . Therefore, at least one of the plurality of driving devices 203 arranged at predetermined intervals along the guide rail 201 can always drive the traveling body 202 inside the guide rail 201 .

Before threading the web W by the paper threading device 200, the tailoring task of connecting the running body 202 to the leading end of the web W is performed. The tailoring process of the web W consists of fixing two guide members 211 and 212 for threading the web W fed out from the paper feeding device R to the leading end of the web W, and attaching the guide members 211 and 212 to a string 213 and a cord 213 . 214 connects to the left and right running bodies 202 . Thereafter, when the traveling body 202 is caused to travel along the guide rail 201 by the driving device 203, the web W connected to the traveling body 202 via the strings 213, 214 and the guide members 211, 212 is pulled along the guide rail 201. Then, the paper is threaded from the paper feeding device R to the folding machine F.

In the above description, when the web W is threaded, the web W is connected to the running body 202 running on the guide rails 201, and the running body 202 runs to pull the web W along the guide rails 201. However, the method is not limited to this method. For example, an operator may manually pull the web W to thread the paper.

As described above, the newspaper offset rotary printing press 10 first performs the paper threading operation of threading the web W from the paper feeding device R to the folding machine F using the paper threading device 200 before starting printing. Next, the printing units U1 to U6 of the printing apparatus U perform printing preparation work such as plate replacement work and cylinder cleaning work. After that, after performing color matching work, tension adjustment work of the web W, and the like, the printing work is started. 2. Description of the Related Art In recent years, there has been a demand for more efficient printing work, and there is a demand for shortening the print preparation work.

Therefore, in the first embodiment, when threading the web W using the paper threading device 200 before printing is started by the newspaper offset rotary printing press 10, plate changing work and cylinder cleaning work in the printing device U are performed. , printing preparation work such as ink winding work is carried out in parallel.

As shown in FIG. 1, the printing apparatus of the first embodiment includes blanket cylinders (printing cylinders) 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b and an infeed drag roller (upstream drive roller) 109. , an exit drag roller (downstream driving roller) 118, a tension adjusting device for adjusting the tension of the web W, and a first roller for detecting that the downstream end of the web W has passed the exit drag roller 118 during the paper threading operation. A web position detection sensor (first web position detector) 141, and when the first web position detection sensor 141 detects the downstream end of the web W, the tension adjustment device adjusts the tension of the web W to a preset predetermined tension. and a control device 140 for stopping the transport of the web W after the process.

Here, the tension adjustment device has an exit drag roller 118 , a paper pressure roller (downstream side paper pressure roller) 119 , and a brake device 107 . When the first web position detection sensor 141 detects the downstream end of the conveyed web W, the control device 140 nips the web W between the exit drag roller 118 and the paper pressure roller 119, and moves the exit drag roller 118. At least one of the rotational speed and the braking force of the braking device 107 is controlled. Here, the downstream end of the web W is, for example, the traveling body 202 of the paper threading device 200 . A tension detection sensor 144 for detecting the tension of the web W is provided between the printing unit U1 and the outlet drag roller 118. As shown in FIG.

Therefore, after adjusting the tension of the web W to a predetermined tension, the controller 140 controls the blanket cylinders (printing cylinders) 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b and the plate cylinders 41a, 41b, 42a, By stopping the rotation of 42b, 43a, 43b, 44a, 44b, the infeed drag roller 109, and the exit drag roller 118, the conveyance of the web W is stopped.

The infeed drag roller 109 and the exit drag roller 118 are rotatable by a motor (for example, a servomotor) capable of holding the current rotation stop position when rotation is stopped. The controller 140 stops the motor when the first web position detection sensor 141 detects the downstream end of the conveyed web W. The servo lock function of the motor is a holding function when the motor is stopped. When there is no command pulse in position control, if even a single pulse is deviated due to an external force, the position loop operates to correct the error, causing current to flow through the motor and generating torque that resists the external force. A stop position can be held.

It also has an alarm device 143 for notifying that printing preparation work (for example, plate replacement work) can be carried out. The control device 140 activates the alarm device 143 when the tension of the web W reaches a predetermined tension by the tension adjusting device. Here, the alarm device 143 is an indicator lamp, a display screen, a speaker, a buzzer, or the like.

In the newspaper offset rotary printing press 10, the printing device U has a plurality of printing units U1 to U6. A tension adjusting device, a first web position detection sensor 141 and a second web position detection sensor 142 are provided in a plurality of printing units U1 to U6. Conveyance of the web W is resumed, and when the second web position detection sensors 142 of the plurality of printing units U1 to U6 detect the downstream end of the conveyed web W, the control device 140 stops conveying the web W. At the same time, the tension of the web W is maintained at a predetermined tension.

It has a second web position detection sensor (second web position detector) 142 for detecting that the downstream end of the web W has reached the triangular plate of the folding machine F, and the control device 140 controls the second web position detection sensor When the downstream end of the web W being conveyed by 142 is detected, the paper pressure roller 135 of the triangular plate drive roller 134 is stopped, and the web is pulled by the tension adjustment device (outlet drag roller 118, paper pressure roller 119, and brake device 107). Release the W tension adjustment control (web tension control).

Further, in the plate changing method of the first embodiment, at least one of the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b holding the web W is separated from the web W, and the web W is in a blanked state. a step of conveying the web W; a step of detecting that the downstream end of the web W in the conveying direction has passed the exit drag roller 118; A step of adjusting the tension to a preset predetermined tension, a step of stopping the conveyance of the web W when the tension of the web W is adjusted to the predetermined tension, and a step of performing plate replacement work when the conveyance of the web W is stopped. have.

The operation of the printing apparatus of the first embodiment will be described in detail below. FIG. 6 is a flowchart representing control of the printing apparatus of the first embodiment, and FIG. 7 is a time chart representing control of the printing apparatus of the first embodiment.

As shown in FIGS. 1 and 6, the controller 140 operates the paper threading device 200 to start threading the web W in step S11. That is, the running body 202 is connected to the leading end of the web W, the running body 202 is run along the guide rail 201 by the driving device 203, and the web W connected to the running body 202 is pulled along the guide rail 201. , the sheet feeding device R starts to be conveyed. At this time, the control device 140 drives and rotates the infeed drag roller 109 , the exit drag roller 118 and the triangular plate drag roller 134 . The controller 140 also rotates the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b, which are partially in contact with the web W. As shown in FIG. At this time, the web W conveyed in the paper threading operation is maintained in a state in which almost no tension is applied. Further, the process of threading the web W is performed by all the printing units U1 to U6.

At step S<b>12 , controller 140 determines whether web W has passed exit drag roller 118 . Specifically, it is determined whether or not the first web position detection sensor 141 has detected the running body 202 connected to the downstream end of the web W. Here, if it is determined (No) that the web W has not passed the exit drag roller 118 (the first web position detection sensor 141 has not detected the traveling body 202), the state of step S12 is maintained. On the other hand, if it is determined (Yes) that the web W has passed through the exit drag roller 118 (the first web position detection sensor 141 has detected the traveling body 202), then in step S13, the paper on the downstream side at the exit position is The pressing roller 119 is moved to the landing position. Then, the web W is held by the outlet drag roller 118 and the paper pressing roller 119 .

In step S14, the control device 140 controls the rotational speed of the exit drag roller 118 and the braking force of the braking device 107 to adjust the tension (web tension) of the web W conveyed through the printing unit U1. Specifically, the rotational speed of the infeed drag roller 109 is made slightly lower than the rotational speed of the outlet drag roller 118 , and braking force is applied to the web W by the braking device 107 . Then, the tension of the web W conveyed through the printing unit U1 increases.

In step S15, the control device 140 determines whether or not the tension of the web W in the printing unit U1 detected by the tension detection sensor 144 has reached a predetermined tension (target paper tension tension). The predetermined tension means a substantially zero tension state (for example, 0 N to 10 N) in which the web W is neither stretched nor loosened. Even in a state in which the web W is not rewound and in a state in which the web W is wound around the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b, the web W is not wound. It's like running away from home. At this time, the path length of the web W and the actual length of the web W are approximately the same. Here, if it is determined that the tension of the web W has not reached the predetermined tension (target paper tension tension) (No), the state of step S15 is maintained. On the other hand, if it is determined (Yes) that the tension of the web W has reached the predetermined tension (target paper tension tension), the paper threading device 200 is stopped to temporarily stop the paper threading operation in step S16. Further, in step S17, the rotation of the drag rollers 109, 118, 134 and the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b is stopped. At step S18, the tension of the web W in the printing unit U1 is maintained at a predetermined tension. Then, in step S19, the warning device 143 turns on the plate replaceable lamp.

Therefore, the operator can confirm that the plate replaceable lamp has been turned on, and can start the plate replacement work for the printing unit U1 in step S20. An automatic plate changer may be installed so that the automatic plate changer automatically operates when the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b stop rotating. In addition, print preparation work other than the plate replacement work may be performed. At this time, the paper threading operation is also performed in the printing units other than the printing unit U1, and the plate replacement operation is performed in the same manner as described above.

In step S21, control device 140 determines whether or not the paper threading operation has been restarted. Here, if it is determined that the paper threading operation has not been restarted (No), the state of step S21 is maintained. On the other hand, when it is determined (Yes) that the paper threading operation has been restarted, the drag rollers 109, 118, and 134 are driven to restart the conveyance of the web W in step S22.

In step S<b>23 , control device 140 determines whether or not web W has passed triangular plate drag roller 134 . Specifically, it is determined whether or not the second web position detection sensor 142 has detected the traveling body 202 connected to the downstream end of the web W. Here, if it is determined (No) that the web W has not passed the triangular plate drag roller 134 (the second web position detection sensor 142 has not detected the traveling body 202), the state of step S23 is maintained. On the other hand, when it is determined (Yes) that the web W has passed the triangular plate drag roller 134 (the second web position detection sensor 142 has detected the traveling body 202), in step S24, the infeed drag roller 109 and the exit drag roller 118 are , the rotation of the triangular plate drag roller 134 is stopped, and the conveyance of the web W is stopped.

In step S25, the control device 140 determines whether or not the plate replacement work has been completed in the printing units U1 to U6 to be used for the printing work. In this case, for example, the operator turns on the plate replacement work lamp when starting the plate replacement work, and turns off the plate replacement work lamp when the plate replacement work is completed. The control device 140 determines the completion of the plate replacement work in the printing units U1 to U6 based on the lighting state of the plate replacement work lamps. Here, if it is determined (No) that the plate replacement work in the printing units U1 to U6 to be used for the printing work has not been completed, the state of step S25 is maintained. On the other hand, if it is determined (Yes) that the plate replacement work in the printing units U1 to U6 to be used for the printing work has been completed, the process proceeds to step S26. It should be noted that the process may proceed to step S26 when the plate replacement work for some of the printing units U1 to U6 to be used for the printing work is completed.

In step S26, the control device 140 determines whether or not the paper threading operation has been completed in the printing units U1 to U6 to be used for the printing operation. The end of the paper threading operation is determined by whether or not the web W to be printed has passed the triangular plate drag roller 134 in the printing units U1 to U6 to be used for the printing operation, that is, by detecting the position of the second web to be used for the printing operation. It is determined whether or not the sensor 142 has detected the traveling body 202 connected to the downstream end of the web W. Here, if it is determined (No) that the paper threading operation in the printing units U1 to U6 to be used for the printing operation has not been completed, the state of step S26 is maintained. On the other hand, if it is determined (Yes) that the paper threading operation has been completed in the target printing units U1 to U6 used for the printing operation, the process proceeds to step S27. In step S27, the control device 140 closes the paper pressing roller 135 of the triangular plate drag roller 134, and in step S28, cancels the tension control for maintaining the web W at a predetermined tension. Then, in step S29, the control device 140 starts the operation of inserting the paper into the folding machine F in a state in which the plurality of webs W that have reached the triangular plate are stacked. That is, in the target printing units U1 to U6 used in the printing operation, the infeed drag roller 109, the exit drag roller 118, and the triangular plate drag roller 134 are driven to rotate, and a plurality of webs W are conveyed to the folding machine F in a state of being stacked. . After that, in step S30, printing is started.

1 and 7, at time t1, blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b (plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b) start rotating. At time t1, the paper threading device 200 is driven, and the infeed drag roller 109, exit drag roller 118, and triangular plate drag roller 134 start rotating. At this time, the braking device 107 of the sheet feeder R operates to suppress the slackness of the web W.

At time t2, the web W passes the outlet drag roller 118, and when the first web position detection sensor 141 detects the traveling body 202 and turns ON from OFF, the downstream paper pressing roller 119, which was at the release position, is pulled up. position, and the web W is held by the outlet drag roller 118 and the paper pressing roller 119 . Then, the rotational speed of the infeed drag roller 109 is made slightly lower than the rotational speed of the exit drag roller 118, and the braking force applied to the web W by the braking device 107 is increased. Then, the tension (web tension) of the web W conveyed through the printing unit U1 increases.

At time t3, when the tension of the web W in the printing unit U1 detected by the tension detection sensor 144 reaches a predetermined tension (target paper tension tension), the braking force of the web W by the braking device 107 is maintained. . Then, the paper threading device 200 is stopped, and the rotation of the infeed drag roller 109, the exit drag roller 118, the triangular plate drag roller 134, and the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b is stopped. In addition, the warning device 143 lights the plate replaceable lamp. Then, the operator confirms that the plate replaceable lamp has been lit, and at time t4, starts the plate replacement work for the printing unit U1, and lights the plate replacement work lamp. The plate replacement work is carried out by driving the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b (plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b) forward and reverse. . At time t5, when the plate replacement work is completed, the plate replacement work lamp is extinguished.

At time t6, when the paper threading operation by the paper threading device 200 is resumed, the paper threading device 200, the drag rollers 109, 118, 134 and the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b ( The plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b) are driven, and the conveyance of the web W is restarted.

At time t7, the web W passes the triangular plate drag roller 134, and when the second web position detection sensor 142 detects the traveling body 202 and turns ON from OFF, each drag roller 109, 118, 134 and the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b (plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b) are stopped. Also, the paper pressure roller 135 of the triangular plate drag roller 134 that was at the release position is moved to the arrival position, and the tension adjustment control (web tension control) of the web W by the exit drag roller 118, the paper pressure roller 119, and the brake device 107 is released. do.

Between time t8 and time t9, the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b, the infeed drag roller 109, and the exit drag roller are stacked in a state in which a plurality of webs W that have reached the triangular plate are stacked. 118 and the triangular plate drag roller 134 are started to rotate, and a plurality of webs W are conveyed to the folding machine F in a state of being overlapped. Then, at time t10, the plate replaceable lamp is extinguished, and printing is started.

[Second embodiment]
FIG. 10 is a flowchart representing control of the printing apparatus of the second embodiment, and FIG. 11 is a time chart representing control of the printing apparatus of the second embodiment. Members having the same functions as those of the above-described first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the printing apparatus of the second embodiment, as shown in FIG. 1, similarly to the first embodiment, when the first web position detection sensor 141 detects the downstream end of the web W, the control device 140 adjusts the tension. After the tension of the web W is adjusted to a predetermined tension by the device, the conveyance of the web W is stopped.

Here, the tension adjustment device has an infeed drag roller 109 , a paper pressure roller (upstream side paper pressure roller) 110 , an exit drag roller 118 , and a paper pressure roller (downstream side paper pressure roller) 119 . When the first web position detection sensor 141 detects the downstream end of the conveyed web W, the control device 140 nips the web W between the infeed drag roller 109 and the paper pressure roller 110, and rotates the exit drag roller. 118 and a paper pressure roller 119, and controls at least one of the rotational speeds of the infeed drag roller 109 and the exit drag roller 118. FIG.

The operation of the printing apparatus of the second embodiment will be described in detail below. As shown in FIGS. 1 and 10, the controller 140 operates the paper threading device 200 to start threading the web W in step S11. At step S<b>12 , controller 140 determines whether web W has passed exit drag roller 118 . Here, if it is determined (No) that the web W has not passed the exit drag roller 118 (the first web position detection sensor 141 has not detected the traveling body 202), the state of step S12 is maintained. On the other hand, if it is determined (Yes) that the web W has passed through the outlet drag roller 118 (the first web position detection sensor 141 has detected the traveling body 202), then in step S13, the upstream paper at the exit position is The pressing roller 110 is moved to the arrival position, and the downstream paper pressing roller 119, which was at the release position, is moved to the arrival position. Then, the web W is held by the infeed drag roller 109 and the paper pressure roller 110 , and the web W is held by the exit drag roller 118 and the paper pressure roller 119 .

In step S14, the control device 140 controls the rotation speed of the infeed drag roller 109 and the rotation speed of the exit drag roller 118 to adjust the tension (web tension) of the web W conveyed through the printing unit U1. Specifically, the rotational speed of the infeed drag roller 109 is set to be lower than the rotational speed of the outlet drag roller 118 . Then, the tension of the web W conveyed through the printing unit U1 increases. In order to suppress the slackness of the web W, a low braking force is applied to the web W by the braking device 107 .

In step S15, the control device 140 determines whether or not the tension of the web W in the printing unit U1 detected by the tension detection sensor 144 has reached a predetermined tension (target paper tension tension). Here, if it is determined that the tension of the web W has not reached the predetermined tension (target paper tension tension) (No), the state of step S15 is maintained. On the other hand, if it is determined (Yes) that the tension of the web W has reached the predetermined tension (target paper tension tension), the paper threading device 200 is stopped to temporarily stop the paper threading operation in step S16. Further, in step S17, the rotation of the drag rollers 109, 118, 134 and the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b is stopped. At step S18, the tension of the web W in the printing unit U1 is maintained at a predetermined tension. Then, in step S19, the warning device 143 turns on the plate replaceable lamp. Therefore, the operator can confirm that the plate replaceable lamp has been turned on, and can start the plate replacement work for the printing unit U1 in step S20.

Note that the processing after step S21 is the same as that of the first embodiment, so the description is omitted.

1 and 11, at time t1, the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b (the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b) start rotating. Also, at time t1, together with the paper threading device 200, the infeed drag roller 109, the exit drag roller 118, and the triangular plate drag roller 134 start rotating. At this time, the braking device 107 of the sheet feeder R operates to suppress the slackness of the web W.

At time t2, when the web W passes the outlet drag roller 118 and the first web position detection sensor 141 detects the traveling body 202 and is turned on from off, the upstream paper pressure roller 110 that was at the released position is put on. position, and the downstream paper pressing roller 119 at the release position is moved to the arrival position. Then, the web W is held by the infeed drag roller 109 and the paper pressure roller 110 , and the web W is held by the exit drag roller 118 and the paper pressure roller 119 . Then, the rotation speed of the in-feed drag roller 109 is made lower than the rotation speed of the exit drag roller 118 . Then, the tension (web tension) of the web W conveyed through the printing unit U1 increases.

At time t3, when the tension of the web W in the printing unit U1 detected by the tension detection sensor 144 reaches a predetermined tension (target paper tension tension), the rotational speeds of the outlet drag roller 118 and the infeed drag roller 109 are reduced. is a constant speed, and the braking force of the web W is maintained. Then, the paper threading device 200 is stopped, and the rotation of the infeed drag roller 109, the exit drag roller 118, the triangular plate drag roller 134, and the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b is stopped. In addition, the warning device 143 lights the plate replaceable lamp. Then, the operator confirms that the plate replaceable lamp has been lit, and at time t4, starts the plate replacement work for the printing unit U1, and lights the plate replacement work lamp.

Note that the processing after time t5 is the same as in the first embodiment, so the description is omitted.

[Third Embodiment]
FIG. 12 is a flowchart representing control of the printing apparatus of the third embodiment, and FIG. 13 is a time chart representing control of the printing apparatus of the third embodiment. Members having the same functions as those of the above-described first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the printing apparatus of the third embodiment, as shown in FIG. 1, similarly to the first embodiment, when the first web position detection sensor 141 detects the downstream end of the web W, the control device 140 adjusts the tension. After the tension of the web W is adjusted to a predetermined tension by the device, the conveyance of the web W is stopped.

Here, the infeed drag roller 109, the outlet drag roller 118, and the triangular plate drag roller 134 are rotatable by a motor having a servo lock function.

The operation of the printing apparatus of the third embodiment will be described in detail below. As shown in FIGS. 1 and 12, the controller 140 operates the paper threading device 200 to start threading the web W in step S11. At step S<b>12 , controller 140 determines whether web W has passed exit drag roller 118 . Here, if it is determined (No) that the web W has not passed the exit drag roller 118 (the first web position detection sensor 141 has not detected the traveling body 202), the state of step S12 is maintained. On the other hand, if it is determined (Yes) that the web W has passed through the outlet drag roller 118 (the first web position detection sensor 141 has detected the traveling body 202), then in step S13, the upstream paper at the exit position is The pressing roller 110 is moved to the arrival position, and the downstream paper pressing roller 119, which was at the release position, is moved to the arrival position. Then, the web W is held by the infeed drag roller 109 and the paper pressure roller 110 , and the web W is held by the exit drag roller 118 and the paper pressure roller 119 .

In step S14, the control device 140 controls the rotation speed of the infeed drag roller 109 and the rotation speed of the exit drag roller 118 to adjust the tension (web tension) of the web W conveyed through the printing unit U1. Specifically, the rotational speed of the infeed drag roller 109 is set to be lower than the rotational speed of the outlet drag roller 118 . Then, the tension of the web W conveyed through the printing unit U1 increases. In order to suppress the slackness of the web W, a low braking force is applied to the web W by the braking device 107 .

In step S15, the control device 140 determines whether or not the tension of the web W in the printing unit U1 detected by the tension detection sensor 144 has reached a predetermined tension (target paper tension tension). Here, if it is determined that the tension of the web W has not reached the predetermined tension (target paper tension tension) (No), the state of step S15 is maintained. On the other hand, if it is determined (Yes) that the tension of the web W has reached the predetermined tension (target paper tension tension), the paper threading device 200 is stopped to temporarily stop the paper threading operation in step S16. Further, in step S17, the rotation of the drag rollers 109, 118, 134 and the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b is stopped. When the controller 140 stops the motors driving the infeed drag roller 109 and the exit drag roller 118 in step S31, the servo lock function is activated. Therefore, in step S18, the tension of the web W in the printing unit U1 is maintained at a predetermined tension. Then, in step S19, the warning device 143 turns on the plate replaceable lamp. Therefore, the operator can confirm that the plate replaceable lamp has been turned on, and can start the plate replacement work for the printing unit U1 in step S20.

In step S21, control device 140 determines whether or not the paper threading operation has been restarted. Here, if it is determined that the paper threading operation has not been restarted (No), the state of step S21 is maintained. On the other hand, if it is determined (Yes) that the paper threading operation has been restarted, the motor is unlocked (operation of the servo lock function is stopped) in step S32, and the drag rollers 109, 118 and 134 are locked in step S22. drive, and the transport of the web W is resumed.

In step S<b>23 , control device 140 determines whether or not web W has passed triangular plate drag roller 134 . Specifically, it is determined whether or not the second web position detection sensor 142 has detected the traveling body 202 connected to the downstream end of the web W. Here, if it is determined (No) that the web W has not passed the triangular plate drag roller 134 (the second web position detection sensor 142 has not detected the traveling body 202), the state of step S23 is maintained. On the other hand, when it is determined (Yes) that the web W has passed the triangular plate drag roller 134 (the second web position detection sensor 142 has detected the traveling body 202), in step S24, the infeed drag roller 109 and the exit drag roller 118 are Then, the rotation of the triangular plate drag roller 134 is stopped, and in step S33, the motor is locked (the servo lock function is activated), and the conveyance of the web W is stopped.

In step S25, the control device 140 determines whether or not the plate replacement work has been completed in the printing units U1 to U6 to be used for the printing work. In this case, for example, the operator turns on the plate replacement work lamp when starting the plate replacement work, and turns off the plate replacement work lamp when the plate replacement work is completed. The control device 140 determines the completion of the plate replacement work in the printing units U1 to U6 based on the lighting state of the plate replacement work lamps. Here, if it is determined (No) that the plate replacement work in the printing units U1 to U6 to be used for the printing work has not been completed, the state of step S25 is maintained. On the other hand, if it is determined (Yes) that the plate replacement work in the printing units U1 to U6 to be used for the printing work has been completed, the process proceeds to step S26. It should be noted that the process may proceed to step S26 when the plate replacement work for some of the printing units U1 to U6 to be used for the printing work is completed.

In step S26, the control device 140 determines whether or not the paper threading operation has been completed in the printing units U1 to U6 to be used for the printing operation. The end of the paper threading operation is determined by whether or not the web W to be printed has passed the triangular plate drag roller 134 in the printing units U1 to U6 to be used for the printing operation, that is, by detecting the position of the second web to be used for the printing operation. It is determined whether or not the sensor 142 has detected the traveling body 202 connected to the downstream end of the web W. Here, if it is determined (No) that the paper threading operation in the printing units U1 to U6 to be used for the printing operation has not been completed, the state of step S26 is maintained. On the other hand, if it is determined (Yes) that the paper threading operation has been completed in the target printing units U1 to U6 used for the printing operation, the process proceeds to step S27. At step S27, the control device 140 puts the paper pressure roller 135 of the triangular plate drag roller 134 on, at step S28, releases the tension control for maintaining the web W at a predetermined tension, and at step S34, locks the motor. After canceling (stopping the operation of the servo lock function), in step S29, the control device 140 starts inserting paper into the folding machine F in a state in which a plurality of webs W that have reached the triangular plate are stacked. That is, in the target printing units U1 to U6 used in the printing operation, the infeed drag roller 109, the exit drag roller 118, and the triangular plate drag roller 134 are driven to rotate, and a plurality of webs W are conveyed to the folding machine F in a state of being stacked. . After that, in step S30, printing is started.

1 and 13, at time t1, blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b (plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b) start rotating. Also, at time t1, together with the paper threading device 200, the infeed drag roller 109, the exit drag roller 118, and the triangular plate drag roller 134 start rotating. At this time, the braking device 107 of the sheet feeder R operates to suppress the slackness of the web W.

At time t2, when the web W passes the outlet drag roller 118 and the first web position detection sensor 141 detects the traveling body 202 and is turned on from off, the upstream paper pressure roller 110 that was at the released position is put on. position, and the downstream paper pressing roller 119 at the release position is moved to the arrival position. Then, the web W is held by the infeed drag roller 109 and the paper pressure roller 110 , and the web W is held by the exit drag roller 118 and the paper pressure roller 119 . Then, the rotational speed of the infeed drag roller 109 is made slightly lower than the rotational speed of the exit drag roller 118, and the braking force applied to the web W by the braking device 107 is increased. Then, the tension (web tension) of the web W conveyed through the printing unit U1 increases.

At time t3, when the tension of the web W in the printing unit U1 detected by the tension detection sensor 144 reaches a predetermined tension (target paper tension tension), the rotational speeds of the outlet drag roller 118 and the infeed drag roller 109 are reduced. is a constant speed, and the braking force of the web W is maintained. Then, the paper threading device 200 is stopped, and the rotation of the infeed drag roller 109, the exit drag roller 118, the triangular plate drag roller 134, and the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b is stopped. At this time, by stopping the motors that respectively drive the infeed drag roller 109 and the exit drag roller 118, the servo lock function is activated and the tension of the web W in the printing unit U1 is maintained at a predetermined tension. In addition, the warning device 143 lights the plate replaceable lamp. Then, the operator confirms that the plate replaceable lamp has been lit, and at time t4, starts the plate replacement work for the printing unit U1, and lights the plate replacement work lamp. The plate replacement work is carried out by driving the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b (plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b) forward and reverse. . At time t5, when the plate replacement work is completed, the plate replacement work lamp is extinguished.

At time t6, when the paper threading operation by the paper threading device 200 is resumed, the lock of the motor is released (the operation of the servo lock function is stopped), and the paper threading device 200, the drag rollers 109, 118, 134 and the blanket cylinder 31a are released. , 31b, 32a, 32b, 33a, 33b, 34a, and 34b (plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, and 44b) are driven, and the transport of the web W is restarted.

At time t7, the web W passes the triangular plate drag roller 134, and when the second web position detection sensor 142 detects the traveling body 202 and turns ON from OFF, each drag roller 109, 118, 134 and the blanket cylinders 31a, 31b, The driving of the plate cylinders 32a, 32b, 33a, 33b, 34a, 34b (plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b) is stopped, and the motors are locked (activation of the servo lock function). Also, the paper pressure roller 135 of the triangular plate drag roller 134 that was at the release position is moved to the arrival position, and the tension adjustment control (web tension control) of the web W by the exit drag roller 118, the paper pressure roller 119, and the brake device 107 is released. do.

Between time t8 and time t9, the lock of the motor is released (the operation of the servo lock function is stopped), and the blanket cylinders 31a, 31b, 32a, 32b, and 33a are overlapped with a plurality of webs W that have reached the triangular plate. , 33b, 34a, 34b, the infeed drag roller 109, the exit drag roller 118, and the triangular plate drag roller 134 are started to rotate, and a plurality of webs W are conveyed to the folding machine F in a state of being overlapped. Then, at time t10, the plate replaceable lamp is extinguished, and printing is started.

[Action and effect of the present embodiment]
A printing apparatus according to a first aspect includes a pair of blanket cylinders (printing cylinders) 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b arranged with a web W therebetween, and blanket cylinders 31a, 31b, and 32a. , 32b, 33a, 33b, 34a, and 34b, an in-feed drag roller (upstream driving roller) 109 arranged upstream in the conveying direction of the web W; An exit drag roller (downstream drive roller) 118 arranged downstream of 34a and 34b in the conveying direction of the web W, and a tension adjusting device for adjusting the tension of the web W between the infeed drag roller 109 and the exit drag roller 118. a first web position detection sensor (first web position detector) 141 for detecting that the downstream end of the web W in the conveying direction has passed the exit drag roller 118 during the paper threading operation; When the sensor 141 detects the downstream end of the web W being conveyed, the tension adjusting device adjusts the tension of the web W to a predetermined tension, and then stops conveying the web W.

In the printing apparatus according to the first aspect, the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b, the infeed drag roller 109, and the exit drag roller 118 are rotated to carry out the paper feeding operation of the web W. When the downstream end of the web W passes the outlet drag roller 118, the tension of the web W is adjusted to a predetermined tension by the tension adjusting device, and then the conveyance of the web W is stopped. By maintaining the tension of the web W between the infeed drag roller 109 and the exit drag roller 118 at a predetermined tension by the tension adjusting device, the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b are rotated. is stopped, the conveyance of the web W is not hindered. Therefore, print preparation work such as plate replacement work can be performed in parallel with the paper threading work, and the print preparation work can be shortened.

In the printing apparatus according to the second aspect, the controller 140 stops the rotation of the blanket cylinders 31a, 31b, 32a, 32b, 33, the infeed drag roller 109, and the exit drag roller 118 after adjusting the tension of the web W. Thus, the transport of the web W is stopped. Thereby, the tension of the web W can be maintained at a predetermined tension by the tension adjusting device.

In the printing apparatus according to the third aspect, the infeed drag roller 109 and the exit drag roller 118 are rotatable by a motor capable of holding the current rotation stop position when rotation is stopped, and the control device 140 detects the first web position. When the sensor 141 detects the downstream end of the conveyed web W, the motor is stopped. As a result, when the web W reaches the outlet drag roller 118 and the web W is stopped, the rotation of the infeed drag roller 109 and the outlet drag roller 118 is locked, and the web W is appropriately maintained at a predetermined tension. be able to.

The printing apparatus according to the fourth aspect includes an infeed drag roller 109, a paper pressure roller (upstream side paper pressure roller) 110, an exit drag roller 118, and a paper pressure roller (downstream side paper pressure roller) as tension adjusting devices. 119. When the first web position detection sensor 141 detects the downstream end of the conveyed web W, the control device 140 nips the web W between the infeed drag roller 109 and the paper pressure roller 110, and rotates the exit drag roller. 118 and a paper pressing roller 119, and controls at least one of the rotation speed of the infeed drag roller 109 and the rotation speed of the exit drag roller 118. FIG. As a result, the tension of the web conveyed between the infeed drag roller 109 and the exit drag roller 118 can be maintained at a predetermined tension. The web W does not wrap around the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b and is not cut, so that the print preparation work can be stably carried out.

The printing apparatus according to the fifth aspect has an exit drag roller 118, a paper pressure roller (downstream side paper pressure roller) 119, and a brake device 107 of the paper feeding device R as tension adjusting devices, and the control device 140 , when the first web position detection sensor 141 detects the downstream end of the conveyed web W, the web W is nipped between the outlet drag roller 118 and the paper pressure roller 119, and the rotational speed and brake of the outlet drag roller 118 are adjusted. At least one of the braking forces of device 107 is controlled. As a result, the tension of the web conveyed between the brake device 107 and the exit drag roller 118 can be maintained at a predetermined tension. are not cut off by wrapping around the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b, and the print preparation work can be carried out stably.

The printing apparatus according to the sixth aspect has an alarm device 143 that informs that the print preparation work can be performed, and the control device 140 causes the alarm device to 143 is activated. As a result, when the tension of the web W is maintained at a predetermined tension, the alarm device 143 that enables the print preparation work to be performed is activated, and the operator can perform the print preparation work such as plate replacement work at an appropriate time. can do.

A printing apparatus according to a seventh aspect includes a second web position detection sensor (second 2 web position detector) 142, the control device 140 restarts the transport of the web W, and when the second web position detection sensor 142 detects the downstream end of the transported web W, the transport of the web W is resumed. is stopped and a predetermined tension is maintained. As a result, when the web W reaches the triangular plate, the transport of the web W is temporarily stopped. Therefore, even if the web W is stopped at the position where the downstream end reaches the triangular plate, the web W is maintained at a predetermined tension. Therefore, the web W does not become slack and adversely affect printing preparation work such as plate changing work.

A printing apparatus according to an eighth aspect is provided with a plurality of printing units U1 to U6, and the control device 140 controls the downstream side of the web W where the second web position detection sensors 142 of the plurality of printing units U1 to U6 are conveyed. When the edge is detected, the paper pressing roller 135 of the triangular plate drag roller 134 is closed, and the tension adjustment control of the web W by the tension adjustment device is released. As a result, even if the tension adjustment device does not maintain the web W at a predetermined tension, the tension of the web W reaching the triangular plate drag roller 134 can be properly maintained. It does not adversely affect the preparation work.

In the printing apparatus according to the ninth aspect, when the control device 140 removes the paper pressure roller 135 of the triangular plate drag roller 134, the tension adjustment device resumes the web tension adjustment control. As a result, when the web W is cut off or when a part of the web W is inserted after printing, it is necessary to remove the paper pressing roller 135 of the triangular plate drag roller 134. However, the tension adjustment control of the web W by the tension adjustment device By restarting , the print preparation work can be performed during the additional paper attachment work, and the workability can be improved. For example, when a new web W is inserted again when the web W is cut off, or when the current job (printing 16 pages) is changed to the next job (printing 24 pages), one web W is added. In such a case, the waiting state is set in the middle of the paper threading operation for the printing of the next job, and this processing is executed when the waiting state is released. Even when the web W is added later in this way, it is possible to improve the efficiency of the print preparation work.

A rotary printing press according to a tenth aspect is a newspaper offset rotary printing press 10 as a printing apparatus, comprising a paper feeding device R, an infeed device I, a printing device U, a web path device D, and a folding machine F and As a result, print preparation work such as plate replacement work can be performed in parallel with the paper threading work, and the print preparation work can be shortened.

A plate changing method according to an eleventh aspect includes a step of conveying the web W with the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b holding the web W in a trunkless state; detecting when the downstream end of the direction has passed the exit drag roller 118; and adjusting the tension of the web W to a predetermined predetermined tension once the downstream end of the web W has passed the exit drag roller 118. , the step of stopping the conveyance of the web W when the tension of the web W is adjusted to a predetermined tension, and the step of performing plate replacement work when the conveyance of the web W is stopped. As a result, print preparation work such as plate replacement work can be performed in parallel with the paper threading work, and the print preparation work can be shortened.

In the above-described embodiment, the first web position detection sensor 141 is used as the first web position detector, and the second web position detection sensor 142 is used as the second web position detector. not something. The transport time of the web W from the paper feeding device R to the exit drag roller 118 is measured in advance, and a timer is applied as a web position detector. Control device 140 may perform various processes.

Further, in the above-described embodiment, the brake device 107, the in-feed drag roller 109, and the exit drag roller 118 are applied as the tension adjusting device, but the configuration is not limited to this. For example, separate brake devices may be provided on the entrance side and the exit side of the printing units U1 to U6, and the tension adjustment device may be configured by these brake devices.

In addition, in the above-described embodiments, the printing press of the present invention is applied to a newspaper offset rotary press, but it may be applied to other web-using printing presses such as a commercial offset rotary press. , it may be a double-sided printer or a single-sided printer.

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 folder F1, F2 folding unit 21, 22, 23, 24 stack 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b blanket cylinder (printing cylinder)
41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b Plate cylinder 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b Ink supply device 61a, 61b, 62a, 62b, 63a, 63b, 64a, 64b Dampening device 101 holding arm 102 guide roller 103 floating roller 104 guide roller 105 tension pickup roller 106 guide roller 107 brake device (tension adjustment device)
108 guide roller 109 infeed drag roller (upstream drive roller, tension adjustment device)
110 paper pressing roller (upstream paper pressing roller)
111 tension pickup roller 112 drive motor 113, 114, 115, 116 drive motor 117 tension pickup roller 118 exit drag roller (downstream side drive roller, tension adjustment device)
119 paper pressing roller (downstream paper pressing roller)
120 guide roller 121 drive motor 122 slitter knife 123 slitter drag roller 124 turn bar 125, 126 compensator 127 drive motor 128, 129 intermediate drag roller 130, 131 paper pressing roller 132, 133 tension pickup roller 134 triangular plate drag roller (triangular plate driving roller)
135 paper pressing roller (triangular paperboard pressing roller)
136 drive motor 137 drive motor 140 control device 141 first web position detection sensor (first web position detector)
142 second web position detection sensor (second web position detector)
143 Alarm device 144 Tension detection sensor 200 Paper threading device 201 Guide rail 202 Traveling body 203 Driving device WR Web paper W Web

Claims (9)

a pair of printing cylinders arranged across the web;
an upstream drive roller disposed upstream of the pair of printing cylinders in the direction of web transport;
a downstream drive roller arranged downstream of the pair of printing cylinders in the direction in which the web is conveyed;
a tension adjusting device for adjusting the tension of the web between the upstream drive roller and the downstream drive roller;
a first web position detector that detects that the downstream end of the web in the conveying direction has passed the downstream drive roller during the paper threading operation;
When the first web position detector detects the downstream end of the web being conveyed, the tension adjusting device adjusts the tension of the web, and when a predetermined tension is reached, the conveying of the web is stopped. a control device for maintaining the tension of the web at the predetermined tension;
with
a second web position detector that detects when the downstream end of the web reaches a triangular plate arranged downstream of the downstream drive roller in the web conveying direction; When web transport is resumed and the second web position detector detects the downstream end of the transported web, transport of the web is stopped and the predetermined tension is maintained;
The pair of printing cylinders, the upstream drive roller, the downstream drive roller, the tension adjustment device, the first web position detector, the second web position detector, and the triangular plate drive roller. When the second web position detectors of the plurality of printing units detect the downstream end of the conveyed web, the control device presses the paper pressing roller of the triangular plate driving roller. and canceling the tension adjustment control of the web by the tension adjustment device,
A printing device characterized by: The control device resumes tension adjustment control of the web by the tension adjustment device when the paper pressure roller of the triangular plate drive roller is removed.
A printing device according to claim 1 . After adjusting the tension of the web to a predetermined tension, the control device stops the conveyance of the web by stopping the rotation of the pair of printing cylinders, the upstream drive roller, and the downstream drive roller.
3. The printing apparatus according to claim 1 or 2 . The upstream drive roller and the downstream drive roller are rotatable by a motor capable of holding a current rotation stop position when rotation is stopped, and the control device controls the position of the web conveyed by the first web position detector. stopping the motor upon detecting the downstream end of
4. A printing device according to claim 3 . The tension adjustment device is provided between the upstream drive roller, an upstream paper pressure roller capable of pinching the web between the upstream drive roller, the downstream drive roller, and the downstream drive roller. and a downstream side paper pressure roller capable of pinching the web with the upstream side drive roller and The web is nipped between the upstream paper pressure roller and the web is nipped between the downstream drive roller and the downstream paper pressure roller, and the upstream drive roller and the downstream drive roller controlling the rotational speed of at least one of the
The printing device according to any one of claims 1 to 4 . The tension adjustment device includes a downstream drive roller, a downstream paper pressure roller capable of nipping the web between the downstream drive roller, and a tension adjustment device upstream of the upstream drive roller in the web conveying direction. and a brake device disposed thereon, wherein when the first web position detector detects the downstream end of the conveyed web, the control device activates the downstream drive roller and the downstream paper pressure roller. sandwiching the web between and controlling at least one of the rotational speed of the downstream drive roller and the braking force of the braking device;
The printing device according to any one of claims 1 to 4 . an alarm device for notifying that print preparation work can be performed, wherein the control device activates the alarm device when the tension of the web reaches the predetermined tension by the tension adjustment device;
A printing apparatus according to any one of claims 1 to 6 . a paper feeding device for feeding a web;
a printing apparatus according to any one of claims 1 to 7 ;
a folding device for vertically folding the web printed by the printing device and then cutting the web to form a predetermined signature;
A rotary printing press comprising: a step of conveying the web in a state in which at least one of a pair of printing cylinders sandwiching the web is separated from the web;
a step of detecting that the downstream end of the web in the conveying direction has passed a downstream drive roller positioned downstream in the conveying direction of the web from the pair of printing cylinders;
adjusting the tension of the web to a predetermined tension as the downstream end of the web passes the downstream drive roller;
a step of stopping conveyance of the web when the tension of the web reaches the predetermined tension and maintaining the tension of the web at the predetermined tension;
a step of performing a plate replacement operation when the conveyance of the web is stopped;
Conveyance of the web is restarted, and when it is detected that the downstream end of the web has reached a triangular plate arranged downstream in the conveying direction of the web from the downstream drive roller, the conveyance of the web is stopped. and maintaining the predetermined tension;
has
A plurality of printing units each having the pair of printing cylinders, an upstream drive roller, a downstream drive roller, and a triangular plate drive roller are provided, and the plurality of printing units detect the downstream edge of the web. Then, the paper pressing roller of the triangular plate driving roller is stopped, and the tension adjustment control of the web is released.
plate exchange method.

Images