JP7088556B2 - Intermittent printing machine - Google Patents

Description

The present invention relates to an intermittent printing machine.

The intermittent printing machine prints an image while traveling in the forward direction on the substrate to be printed, prints, then travels on the substrate to be printed in the reverse direction without printing the image, and then travels in the forward direction again. Printing is repeated, and the image is printed on the substrate to be printed with a small gap in the vertical direction.
For example, Patent Document 1 discloses an intermittent printing machine.
In this intermittent printing machine, a plurality of printing units are provided between two feed rollers driven in a forward rotation drive and a reverse rotation drive, and the printing unit has a plate cylinder, a blanket cylinder, and an impression cylinder. The peripheral surface of the blanket cylinder has a large-diameter portion that is in pressure contact with the peripheral surface of the impression cylinder and a small-diameter portion that is separated from the peripheral surface of the impression cylinder.

Then, when the two feed rollers are driven in a forward rotation to travel in the positive direction on the substrate to be printed, the large diameter portion of the blanket cylinder and the peripheral surface of the impression cylinder are in pressure contact with each other to print an image on the substrate to be printed. After printing the image, the two feed rollers are driven in reverse rotation to travel in the opposite direction on the substrate to be printed. When the substrate to be printed travels in the opposite direction, the image is not printed because the substrate to be printed passes through the gap between the small diameter portion of the blanket cylinder and the peripheral surface of the impression cylinder.
By repeating this operation, an image is printed on the substrate to be printed with a small gap in the vertical direction.
Since this intermittent printing machine passes through the gap between the small diameter portion of the blanket cylinder and the peripheral surface of the impression cylinder when the substrate to be printed travels in the opposite direction, the substrate to be printed is sandwiched between the impression cylinder and the blanket cylinder. The movement is not regulated.

For this reason, when the substrate to be printed travels in the opposite direction, the substrate to be printed tends to vary and sag. When the substrate to be printed varies or sags, the substrate to be printed is damaged due to the contact of the substrate to be printed with the blanket cylinder or the impression cylinder, and printing stains occur.
Patent Document 2 discloses an intermittent printing machine that solves this problem.
In this intermittent printing machine, by providing two guide rollers, the substrate to be printed is wound around the peripheral surface of the impression cylinder at a predetermined winding angle, and the impression cylinder is driven in a forward rotation in synchronization with the two feed rollers. It is driven in reverse rotation.
According to this intermittent printing machine, the substrate to be printed is wound around the peripheral surface of the impression cylinder, so that the movement of the substrate to be printed is restricted when the substrate to be printed travels in the opposite direction. Therefore, when the substrate to be printed travels in the opposite direction, the substrate to be printed does not vary or sag.

Japanese Unexamined Patent Publication No. 2-75561 Japanese Unexamined Patent Publication No. 2006-247869

As disclosed in Patent Document 2, when the substrate to be printed is wound around the peripheral surface of the impression cylinder and the impression cylinder is driven by a forward rotation drive and a reverse rotation drive, printing is performed by an intermittent printing machine, and the printing register varies. I had something to do. In particular, when printing was performed using a film to be printed or a substrate to be printed having a high surface smoothness, the printing register varied remarkably.
As a result of investigating the cause of the variation in the printing register, the present inventors have found the following, and have arrived at the present invention.
Since the substrate to be printed is wound around the peripheral surface of the impression cylinder, it is difficult to slide the substrate to be printed on the peripheral surface of the impression cylinder to run. By driving in the forward rotation and the reverse rotation, the substrate to be printed is driven in the forward and reverse directions by the rotation of the impression cylinder.

For this reason, when the substrate to be printed travels in the opposite direction or when the direction is changed, the peripheral surface of the impression cylinder and the small diameter portion of the blanket cylinder are separated from each other, and the substrate to be printed is not the small diameter portion of the blanket cylinder. Since the substrate to be printed travels only by the frictional force generated between the peripheral surface of the impression cylinder and the substrate to be printed by contact, when the frictional force is small, the peripheral surface of the impression cylinder and the substrate to be printed Slip may occur between them.
When a slip occurs between the peripheral surface of the impression cylinder and the substrate to be printed, the tip of the large diameter portion of the blanket cylinder in the rotational direction is covered when the substrate to be printed is moved in the positive direction to start printing an image. Since the position where the contact with the printing substrate starts is shifted in the vertical direction, the printing register is shifted.
Since the slip length is not constant and varies, the print register varies.
When printing is performed using a substrate to be printed having a high surface smoothness, slippage is likely to occur between the substrate to be printed and the peripheral surface of the impression cylinder, so that the printing register varies significantly.

When a film is used as the substrate to be printed, the density of the film is high and air does not pass through it. Therefore, the film remains between the peripheral surface of the impression cylinder and the film in a state of being wound around the peripheral surface of the impression cylinder. Air cannot escape from the surface of the film through the film.
Further, when the rotational speed of the impression cylinder (running speed of the substrate to be printed) increases, air may be drawn between the peripheral surface of the impression cylinder and the film to form an air layer.
From these facts, when the film is used as the substrate to be printed, the frictional force between the peripheral surface of the impression cylinder and the film is small, and slip is likely to occur, so that the printing register varies remarkably.

The present invention has been made to solve the above-mentioned problems, and an object thereof is that slip occurs between the peripheral surface of the impression cylinder and the substrate to be printed when traveling on the substrate to be printed. It is to provide an intermittent printing machine in which the printing register does not vary.

The intermittent printing machine of the present invention has a paper receiving unit that feeds out a substrate to be printed, a printing unit having a plurality of printing units for printing an image on the substrate to be printed sent from the paper receiving unit, and an image is printed. Equipped with a paper ejection section that discharges the printed substrate
The paper-entry portion includes a shock absorber on the paper-entry side that stores the substrate to be printed in a loop, a forward rotation drive that travels the substrate to be printed in the forward direction, and a reverse rotation that travels the substrate to be printed in the reverse direction. It has a step back roller on the paper entry side that is driven,
The printing unit has an impression cylinder, an image range in contact with the peripheral surface of the impression cylinder, and a blanket cylinder having a non-image range not in contact with the peripheral surface of the impression cylinder.
The paper ejection unit is printed with a forward rotation drive that travels in the positive direction of the substrate to be printed and a step back roller on the output side that is driven in the reverse rotation that travels in the reverse direction of the substrate to be printed. It has a shock absorber on the discharge side that stores the substrate to be printed in a loop shape.
By synchronously driving the step back roller on the paper entry side and the step back roller on the paper discharge side in a forward rotation, the substrate to be printed is driven in the positive direction, and the peripheral surface of the impression cylinder and the above are described. An image is printed on the substrate to be printed in the image range of the blanket body, and the step back roller on the paper entry side and the step back roller on the paper discharge side are synchronously driven in reverse rotation to drive the print base. In an intermittent printing machine in which the material is run in the opposite direction through a gap between the peripheral surface of the impression cylinder and the non-image range of the blanket cylinder.
A guide roller on the paper entry side and a guide roller on the paper discharge side are used to wind the substrate to be printed, which passes between the peripheral surface of the impression cylinder and the blanket cylinder, around the peripheral surface of the impression cylinder at a predetermined winding angle. Provide,
A nip roller for the impression cylinder is provided to press the substrate to be printed wound around the peripheral surface of the impression cylinder against the peripheral surface of the impression cylinder.
When traveling in the forward direction on the substrate to be printed, the impression cylinder is driven in a forward rotation in synchronization with the step back roller on the paper entry side and the step back roller on the paper discharge side, and the substrate to be printed is reversed. When traveling in the direction, the impression cylinder is driven in reverse rotation in synchronization with the step back roller on the paper entry side and the step back roller on the paper discharge side.
A drying device for drying the substrate to be printed wrapped around the peripheral surface of the impression cylinder and a cooling device for the impression cylinder for cooling the impression cylinder are provided.
The drying device is an intermittent printing machine characterized in that it is located on the upstream side in the forward rotation direction of the impression cylinder with respect to the nip roller for the impression cylinder.

In the intermittent printing machine of the present invention, the guide roller on the paper entry side and the guide roller on the paper ejection side are extension lines of the traveling path on the paper entry side between the guide roller on the paper entry side and the impression cylinder. And the intermittent printing machine provided so that the extension line of the traveling path on the paper ejection side between the guide roller on the paper ejection side and the impression cylinder intersect.
According to this intermittent printing machine, the winding angle of the substrate to be printed wound around the peripheral surface of the impression cylinder can be 180 degrees or more, and the frictional force between the peripheral surface of the impression cylinder and the substrate to be printed can be set. Is large, and slippage can be reliably prevented.

In the intermittent printing machine of the present invention, the impression cylinder is driven in a forward rotation at the same constant speed as the blanket cylinder when the blanket cylinder rotates in the image range from the printing start position and prints an image on the substrate to be printed. Then, when the blanket cylinder rotates in a non-image range from the printing end position, the impression cylinder is decelerated from the constant speed to a forward rotation drive to stop rotating, and after the rotation is stopped, the impression cylinder accelerates to a predetermined reverse rotation drive speed and reverse rotation. The rear end of the printed image printed on the substrate to be printed and the said It can be an intermittent printing machine in which the tip of the printing range of the blanket body is in contact with the printing range.
According to this intermittent printing machine, the impression cylinder gradually stops rotating and gradually starts rotating, so that slip occurrence between the substrate to be printed and the peripheral surface of the impression cylinder is prevented, and the impression cylinder There is no failure in the drive system.

In the intermittent printing machine of the present invention, the change in the rotation drive speed ratio of the deceleration forward rotation drive of the impression cylinder and the change of the rotation drive speed ratio of the acceleration forward rotation drive are line-symmetrical, and the acceleration reverse rotation of the impression cylinder. The change in the rotation drive speed ratio of the drive and the change in the rotation drive speed ratio of the deceleration reverse rotation drive are line-symmetrical, and the change in the rotation drive speed ratio from the constant speed of the impression cylinder to the predetermined reverse rotation drive speed and the above. It is possible to use an intermittent printing machine in which the rotation drive speed ratio change from a predetermined reverse rotation drive speed to the constant speed changes smoothly along a substantially U-shaped curve.
According to this intermittent printing machine, the impression cylinder smoothly changes in speed, and the substrate to be printed smoothly turns in the opposite direction and the forward direction to travel. It is possible to prevent the occurrence of slip between them and to print accurately on the substrate to be printed.

In the intermittent printing machine of the present invention, a register adjusting device is provided between the printing units, and the register adjusting device changes the length of the path of the substrate to be printed between the printing units to print a register. It can be an intermittent printing machine having a configuration for adjusting.
According to this intermittent printing machine, the printing register before printing is adjusted by changing the length of the traveling path between the printing units, so that the printing register is printed with the substrate to be printed wrapped around the peripheral surface of the impression cylinder. Can be adjusted.

In the intermittent printing machine of the present invention, the register adjusting device has a pull roller on the paper entry side, a pull roller on the paper ejection side, and a movable roller, and by moving the movable roller, the paper entry side In a configuration in which the length of the traveling path between the pull roller and the pull roller on the paper ejection side is changed, both the pull rollers are synchronized with the step back roller on the paper entry side and the step back roller on the paper ejection side. Both of the printed base materials, which are driven in the forward rotation to travel in the forward direction on the substrate to be printed and in the reverse rotation to travel in the reverse direction on the substrate to be printed, are wound around the peripheral surfaces of both of the pull rollers. It can be an intermittent printing machine provided with nip rollers for pull rollers that are pressed against the peripheral surface of the pull rollers.
According to this intermittent printing machine, slip does not occur between the peripheral surface of the pull roller on the paper entry side and the substrate to be printed, and also between the peripheral surface of the pull roller on the paper ejection side and the substrate to be printed. Since no slip occurs, there is no variation in the print register due to the register adjustment device.

In the intermittent printing machine of the present invention, the rotation speed of the step back roller on the paper entry side, the rotation speed of the step back roller on the paper discharge side, the rotation speed of the impression cylinder of each printing unit, and each register. It is possible to use an intermittent printing machine in which the rotation speed of the pull roller on the paper entry side and the rotation speed of the pull roller on the paper discharge side of the adjusting device can be controlled separately.
According to this intermittent printing machine, the tension of the substrate to be printed can be adjusted for each printing unit.

In the intermittent printing machine of the present invention, at least two pull rollers around which the substrate to be printed is wound are provided on the path of the substrate to be printed between the printing units, and the pull rollers are the steps on the paper entry side. Synchronized with the back roller and the step back roller on the paper ejection side, a forward rotation drive for traveling the substrate to be printed in the forward direction and a reverse rotation drive for traveling the substrate to be printed in the reverse direction are performed. The printing substrate wound around the peripheral surface of the pull roller can be used as an intermittent printing machine provided with a nip roller for the pull roller that presses the substrate to be printed against the peripheral surface of each pull roller.
According to this intermittent printing machine, there is no variation or slack in the substrate to be printed running on the running path between the printing units.
Moreover, the frictional force between the peripheral surface of the pull roller and the substrate to be printed becomes large, slip does not occur between the two, and the print register does not vary due to the provision of the pull roller.

In the intermittent printing machine of the present invention, the substrate to be printed can be an intermittent printing machine which is a film.
According to this intermittent printing machine, an image can be printed on a film without any variation in printing register.

According to the intermittent printing machine of the present invention, when traveling on the substrate to be printed, slip does not occur between the peripheral surface of the impression cylinder and the substrate to be printed, so that the printing register does not vary.
Since the ink of the image printed on the substrate to be printed is fixed and dried by the drying device, the image is not disturbed due to contact with the nip roller for the impression cylinder, and the ink adheres to the nip roller for the impression cylinder. It does not get dirty.
Since the impression cylinder is cooled by the cooling device, the impression cylinder and the substrate to be printed do not reach a high temperature.
The shock absorber on the paper entry side and the shock absorber on the paper discharge side can store the substrate to be printed in a loop shape, and can smoothly run the substrate to be printed in the forward direction and the reverse direction.

It is an overall front view of the intermittent printing machine which concerns on embodiment of this invention. FIG. 3 is an enlarged front view of a paper feeding unit and a paper receiving unit of the intermittent printing machine shown in FIG. 1. It is an enlarged front view of the paper ejection part and the post-processing part of the intermittent printing machine shown in FIG. 1. It is an enlarged front view of the two printing unit portions of the intermittent printing machine shown in FIG. 1. It is a block diagram of a printing plate, a blanket cylinder, and an impression cylinder. It is an operation explanatory diagram from the printing start to the printing end at the time of printing at the beginning of a printing unit. It is operation explanatory drawing from the first printing end to the start of the second printing of a print unit. It is an operation explanatory diagram from the print start to the print end of the second print. It is a figure which shows the rotation angle and the rotation drive speed ratio of the impression cylinder with respect to the rotation angle of a blanket cylinder. It is a figure which shows the rotation drive speed change of an impression cylinder. It is explanatory drawing of the printing unit which attached the short size blanket. It is a figure which shows the rotation angle and the rotation drive speed ratio of the impression cylinder with respect to the rotation angle of a blanket cylinder. It is explanatory drawing of the printing unit which attached the long blanket. It is a figure which shows the rotation angle and the rotation drive speed ratio of the impression cylinder with respect to the rotation angle of a blanket cylinder. It is an enlarged front view of the impression cylinder portion of the printing unit shown in FIG. It is a front view of the mounting part of the nip roller for the impression cylinder shown in FIG. 16 is a cross-sectional view taken along the line AA of the mounting portion of the nip roller for the impression cylinder shown in FIG. It is a front view of the mounting part of the impression cylinder shown in FIG. It is BB sectional view of the mounting part of the impression cylinder shown in FIG. It is an enlarged front view of the register adjustment device shown in FIG. FIG. 2 is a sectional view taken along the line CC of the register adjusting device shown in FIG. It is explanatory drawing of the tension adjustment of the substrate to be printed of each printing unit. It is a front view which shows the other embodiment of the runway of the substrate to be printed between printing units.

The overall basic configuration of the intermittent printing machine of the present invention will be described with reference to FIG. FIG. 1 is an overall front view of an intermittent printing machine according to an embodiment of the present invention.
The intermittent printing machine 100 is fed from a paper feeding unit 1A for feeding the printing base material W, a paper receiving unit 1B for feeding out the printing base material W fed from the paper feeding unit 1A, and a paper receiving unit 1B. A printing unit 2 that prints an image on the printed substrate W, a paper ejection unit 3A that discharges a printed substrate W on which an image is printed (hereinafter, simply referred to as a printed substrate W), and a printing unit to be printed. It is provided with a post-processing unit 3B for post-processing the base material W.
The substrate W to be printed used in the intermittent printing machine 100 of this embodiment is a film having a high surface smoothness and flexibility. For example, flexible packaging materials are used.

In general, flexible packaging means a packaging material composed of highly flexible materials, and thin and flexible materials such as polypropylene (PP) and polyethylene (PE) are used alone or in combination. It is a general term for packaging that has been made.
Since these are film materials, they have higher surface smoothness and flexibility than paper. In addition, a film method synthetic paper or the like is also used as a similar substrate W to be printed.

In the embodiment of the present invention, the paper feeding unit 1A is a paper feeding device 4 described in detail for feeding the printing substrate W.
The paper receiving unit 1B has a paper receiving side shock absorber 5 for storing the printed base material W fed from the paper feeding device 4 in a loop shape and a printed base material W stored by the paper receiving side shock absorber 5. It has a step back roller 6 on the paper entry side for running the paper.
The printing unit 2 has a plurality of printing units. For example, a first printing unit 2a that prints using black (K) color ink, a second printing unit 2b that prints using cyan (C) color ink, and a magenta (M) color. The third printing unit 2c that prints using the ink of the above, the fourth printing unit 2d that prints using the yellow (Y) color ink, and the fifth printing unit 2e and the sixth that perform solid white printing. It has 6 printing units of the printing unit 2f.

Then, in the first to fourth printing units 2a to 2d, different one-color color printing is performed on the substrate W to be printed.
After this color printing, solid white printing is performed on the substrate W to be printed by the fifth and sixth printing units 2e and 2f.
Color printing is visible from the side opposite to the printing surface side and through the printed substrate W. The solid white color is used as a background color for improving the visibility of color printing.
As described above, since the printing unit 2 has 6 printing units 2a, 2b, 2c, 2d, 2e, and 2f, it has four printing units like the printing unit shown in Patent Document 2. Compared to the intermittent printing machine, the length of the path of the substrate W to be printed between the step back rollers (the distance from the step back roller 6 on the paper entry side to the step back roller 10 on the paper discharge side, which will be described later) is longer. Variations in the print register are likely to occur.

The six printing units 2a, 2b, 2c, 2d, 2e, and 2f have the same structure, and have three cylinders, a plate cylinder 7, a blanket cylinder 8, and an impression cylinder 9.
The paper ejection unit 3A is on the paper ejection side that stores the step back roller 10 on the paper ejection side on which the substrate W to be printed is driven and the substrate W to be printed on the step back roller 10 on the paper ejection side in a loop. It has a shock absorber 11, an automatic registering device 38 described later, and a monitoring device 39.
In the embodiment of the present invention, the post-processing unit 3B is a winding device 12 that winds up the substrate W to be printed stored in the shock absorber 11 on the paper ejection side.

The basic printing operation of this intermittent printing machine is as follows.
The step back roller 6 on the paper entry side and the step back roller 10 on the paper discharge side are stored in a loop shape by the shock absorber 5 on the paper entry side and the shock absorber 11 on the paper discharge side. , Synchronously drive in the forward rotation, and print the image while traveling the substrate W to be printed in the positive direction (direction from the paper entry portion 1B toward the paper ejection portion 3A).
After printing, the step back roller 6 on the paper entry side and the step back roller 10 on the paper ejection side are driven in reverse rotation in synchronization, and the substrate W to be printed is moved in the opposite direction (from the paper ejection portion 3A to the paper entry portion 1B). After traveling in the direction toward the front and adjusting the position in the vertical direction so that the rear end of the printed image becomes the next printing start position, the step back roller 6 on the paper entry side and the step back roller 10 on the paper discharge side are positive. The image is printed while being driven to rotate and traveling in the positive direction on the substrate W to be printed. By repeating this operation, an image is printed on the substrate W to be printed with a small gap in the vertical direction. That is, the basic printing operation is the same as that of the conventional intermittent printing machine.

As shown in FIG. 2, the paper feed device 4 feeds out a paper feed shaft 20 to which a roll-shaped printed base material W is attached and a paper feed base W attached to the paper feed shaft 20. It has a roller 21, a corona processing device 24, a tension detection device 25, and a meandering prevention device 26, which will be described in detail later. That is, the paper feed device 4 is from the paper feed shaft 20 to the feed roller 21.
A powder brake (not shown) is connected to the paper feed shaft 20 so that rotational resistance can be applied to the paper feed shaft 20.
The substrate W to be printed, which is fed out from the paper feed shaft 20, is wound around the peripheral surface of the feed roller 21. A drive motor (not shown) is connected to the feed roller 21, and the drive motor drives the feed roller 21 to rotate only in the direction in which the substrate W to be printed is fed (clockwise in FIG. 2).

The feed roller 21 is not rotationally driven in the direction opposite to the feed direction (counterclockwise in FIG. 2).
At least one nip roller 22 is in pressure contact with the peripheral surface of the feed roller 21. The substrate W to be printed is sandwiched between the nip roller 22 and the feed roller 21, and the substrate W to be printed is pulled by rotationally driving the feed roller 21 with a drive motor, and the paper feed shaft 20 is rotated to form a roll-shaped cover. The printing substrate W is fed out so that it can be reliably sent out toward the shock absorber 5 on the paper entry side. The nip roller 22 is pressed against the peripheral surface of the feed roller 21 within a range in which the substrate W to be printed is wound.
The paper feed shaft 20 rotates when the base material W to be printed is fed, but since the paper feed shaft 20 is provided with a rotation resistance by a powder brake, the size of the rotation resistance of the paper feed shaft W is large. A tension (tension) of a value commensurate with (braking force) is generated.

A corona processing device 24, a tension detection device 25, and a meandering prevention device 26 are provided on the traveling path 23 of the substrate W to be printed from the paper feed shaft 20 to the feed roller 21.
The corona treatment apparatus 24 performs corona treatment on the surface of the substrate W to be printed. By applying the corona treatment, the surface of the substrate W to be printed is modified, and the fixability of the ink to the substrate W to be printed is improved. The substrate W to be printed used in this embodiment is a material for flexible packaging such as a film, and has poor ink fixability as compared with paper, so that it is preferably corona-treated.
The tension detecting device 25 detects the tension of the substrate W to be printed, which is fed out from the paper feed shaft 20. The detected tension value is compared with the set tension value by a control unit (not shown). The control unit adjusts the braking force of the powder brake so that the detected tension value and the set tension value match, so that the substrate W to be printed can always be fed out at the set tension value.

The meandering prevention device 26 detects the position of the substrate W to be printed in the width direction, and if it deviates from a predetermined position, moves the substrate W to be printed in the width direction to a position in the predetermined width direction. This prevents the position shift of the substrate W to be printed in the width direction. The width direction of the substrate W to be printed is a direction perpendicular to the feeding direction.
As shown in FIG. 2, the shock absorber 5 on the paper entry side has an upward concave portion 5a like a box having an open upper portion and a suction device (not shown) for sucking air in the upward concave portion 5a. By sucking the air in the upward concave portion 5a with the suction device, the substrate W to be printed is absorbed in the upward concave portion 5a and stored in a loop shape. The suction force of the suction device is controlled so that the substrate W to be printed stored in the upward concave portion 5a has a tension that does not meander.
Further, the feed roller 21 responds to the output of a sensor (not shown) attached to the shock absorber 5 so that the length of the substrate W to be printed stored in the upward recessed portion 5a falls within a predetermined range. Control the rotation speed of.

As shown in FIG. 2, the step back roller 6 on the paper entry side has two drive rollers 27 that are driven in a forward rotation and a reverse rotation by a drive motor (not shown), and at least two that are in pressure contact with the peripheral surface of each drive roller 27. It has two nip rollers 28. The two drive rollers 27 are provided apart from each other in the vertical direction.
The substrate W to be printed is wound around two drive rollers 27 so as to have an inverted S shape and travels, and the substrate W to be printed is sandwiched between each drive roller 27 and a nip roller 28, respectively. Has been done. The two nip rollers 28 are pressed against each other at positions separated in the rotational direction within the range around which the substrate W to be printed is wound on the peripheral surface of the drive roller 27.
Therefore, by driving the drive roller 27 in the forward rotation and the reverse rotation, the substrate W to be printed can be reliably traveled in the forward direction and the reverse direction.

In this embodiment, the paper feeding unit 1A (paper feeding device 4) and the paper receiving unit 1B (paper receiving side shock absorber 5 and paper receiving side step back roller 6) are set as one unit, but the present invention is limited to this. There is no such thing.
For example, the paper feeding unit 1A (paper feeding device 4) may be used as one unit, and the paper receiving unit 1B (shrinking device 5 on the paper receiving side and the step back roller 6 on the paper receiving side) may be used as another unit. In this case, it is preferable to provide a feed roller on the paper feed side of the shock absorber 5 on the paper input side. That is, in the paper feed unit 1A and the paper input unit 1B shown in FIG. 2, the feed roller 21 of the paper feed device 4 also serves as the feed roller of the shock absorber 5 on the paper input side.

As shown in FIG. 3, the step back roller 10 on the paper ejection side has two drive rollers 30 driven in a forward rotation and a reverse rotation by a drive motor (not shown), and at least two which are in pressure contact with the peripheral surface of each drive roller 30. It has two nip rollers 31. The two drive rollers 30 are provided apart from each other in the vertical direction.
The substrate W to be printed is wound around two drive rollers 30 so as to have an S-shape and travels, and the substrate W to be printed is sandwiched between each drive roller 30 and a nip roller 31, respectively. ing. The two nip rollers 31 are pressed against each other at positions separated in the rotational direction within the range around which the substrate W to be printed is wound on the peripheral surface of the drive roller 30.
Therefore, by driving the drive roller 30 in the forward rotation and the reverse rotation, the substrate W to be printed can be reliably traveled in the forward direction and the reverse direction.
The step back roller 10 (drive roller 30) on the paper ejection side and the step back roller 6 (drive roller 27) on the paper entry side are synchronously driven in the forward rotation and the reverse rotation.

The shock absorber 11 on the paper ejection side post-processes an upward concave portion 11a such as a box having an open upper portion, a suction device (not shown) for sucking air in the upward concave portion 11a, and a substrate W to be printed. It has a feed roller 33 that feeds toward the portion 3B, and by sucking the air in the upward concave portion 11a with the suction device, the substrate W to be printed is absorbed in the upward concave portion 11a and stored in a loop shape.
The suction force of the suction device is controlled so that the substrate W to be printed stored in the upward concave portion 11a has a tension that does not meander.
Then, the feed roller 33 responds to the output of a sensor (not shown) attached to the shock absorber 11 so that the length of the substrate W to be printed stored in the upward concave portion 11a is within a predetermined range. Control the rotation speed of.

The substrate W to be printed, which is unwound from the shock absorber 11 on the paper ejection side, is wound around the peripheral surface of the feed roller 33. A drive motor (not shown) is connected to the feed roller 33, and the drive motor is rotationally driven only in the direction of feeding the substrate W to be printed toward the post-processing unit 3B (clockwise in FIG. 3). It does not rotate in the opposite direction (counterclockwise in FIG. 3).
At least two nip rollers 34 are in pressure contact with the peripheral surface of the feed roller 33. The substrate W to be printed is sandwiched between the nip roller 34 and the feed roller 33, and the substrate W to be printed is pulled by rotationally driving the feed roller 33 with a drive motor, so that the substrate W to be printed can be reliably fed to the post-processing unit 3B. I am trying to do it.
The two nip rollers 34 are pressed against each other on the peripheral surface of the feed roller 33 at positions separated in the rotational direction within a range in which the substrate W to be printed is wound.

On the path 37 of the substrate W to be printed between the step back roller 10 on the paper ejection side and the printing unit 2 (sixth printing unit 2f), an automatic registering device 38 for detecting variations in the printing register and an automatic registering device 38 are provided. A monitoring device 39 is provided. The automatic register device 38 is located on the printing unit 2 side, and the monitoring device 39 is located on the step back roller 10 side on the paper ejection side.
The automatic register device 38 reads the dots printed on the substrate W to be printed by the printing units 2a to 2f, measures the pitch between the dots, finds the misalignment of the printing register of the printing units 2a to 2f, and prints. Make fine adjustments to the register during the printing operation. The fine adjustment of the print register by the automatic register device 38 is performed by automatically controlling each of the print units 2a to 2f based on the information of the printing machine set in advance.

The monitoring device 39 has a camera unit 39a that captures an image printed on the substrate W to be printed, and a monitor (not shown) that displays the captured image as an image.
The register marks of each color printed on the substrate W to be printed by the printing units 2a to 2f are photographed by the camera unit 39a and displayed as an image on the monitor. By viewing the image on the monitor, the operator can know which printing unit has the print register in the top-bottom direction and the print register in the width direction, so that the operator can correct the print register in the top-bottom direction. It is possible to manually correct the misalignment of the print register in the width direction.

The printing register in the top-bottom direction and the printing register in the width direction are one drive motor (not shown) that rotationally drives the plate cylinder 7 and the blanket cylinder 8 shown in FIG. 1, and a drive motor that moves the plate cylinder 7 in the width direction. It is configured to be adjusted by driving (not shown).
Therefore, the print register in the top-bottom direction and the print register in the width direction can be adjusted by automatically controlling each drive motor by the automatic register device 38 and by the operator controlling and operating each drive motor based on the result of the monitoring device 39. ..

As shown in FIG. 3, the winding device 12 has a winding shaft 32 for winding the substrate W to be printed, and a tension detecting device 36 described later.
A drive motor (not shown) is connected to one end of the take-up shaft 32, and the drive motor is rotationally driven only in the direction in which the substrate W to be printed is wound (clockwise in FIG. 3), and is driven in the direction opposite to the take-up direction. It is designed not to rotate (counterclockwise in FIG. 3).
The traveling path 35 of the printed substrate W extending from the feed roller 33 to the take-up shaft 32 is provided with a tension detecting device 36 for detecting the tension of the printing substrate W traveling on the traveling path 35.
The tension value detected by the tension detection device 36 is compared with the tension value set by a control unit (not shown), and the rotation speeds of the take-up shaft 32 and the feed roller 33 are controlled so that the detected tension value becomes the set tension value. do.

That is, by making the rotation speed of the take-up shaft 32 faster than the rotation speed of the feed roller 33, tension is generated in the substrate W to be printed traveling on the traveling path 35, and the magnitude of the tension is the same as that of the feed roller 33. Since it is determined by the difference in rotation speed of the shaft 32, the tension value detected by changing the difference in rotation speed is made to match the set tension value.
The post-processing unit 3B is not limited to the winding device 12.
For example, a processing device for processing the base material W to be printed, a unit for transporting the base material W to be printed to another device provided on the downstream side, a delivery unit, and the like can be used as the post-processing unit 3B.

The printing units 2a to 2f will be described with reference to FIG. FIG. 4 is an enlarged front view of two printing units 2a and 2b of the intermittent printing machine shown in FIG. 1.
The plate cylinder 7, the blanket cylinder 8, the impression cylinder 9, and each member described later are provided in the machine frame 2A of the printing unit, respectively, but each cylinder and each member are shown by solid lines for easy understanding. There is.
The plate cylinder 7 and the blanket cylinder 8 are rotationally driven in opposite directions (directions of arrows in FIG. 4) in synchronization with one drive motor (not shown).
The impression cylinder 9 is driven in the forward rotation and the reverse rotation in synchronization with the step back roller 6 on the paper entry side and the step back roller 10 on the paper discharge side by the impression cylinder drive motor described later.

The configuration of the plate cylinder 7, the blanket cylinder 8, and the impression cylinder 9 will be described with reference to FIG.
As shown in FIG. 5, a printing plate 7a shorter than the entire peripheral length of the plate cylinder 7 (the length in the circumferential direction of the peripheral surface) is attached to the peripheral surface of the plate cylinder 7. Ink is supplied to the printing plate 7a of the plate cylinder 7 from an ink supply device (not shown) provided adjacent to the plate cylinder 7.
A blanket 8a shorter than the entire circumference of the blanket body 8 is attached to the peripheral surface of the blanket body 8.
As shown in FIG. 5A, the plate cylinder 7 and the blanket cylinder 8 are in contact with the printing plate 7a and the blanket 8a, and the image of the printing plate 7a is transferred to the blanket 8a. The peripheral surface portion of the plate cylinder 7 to which the printing plate 7a is not attached does not come into contact with the blanket 8a of the blanket cylinder 8.

As shown in FIG. 5B, in the blanket cylinder 8 and the impression cylinder 9, the peripheral surfaces of the blanket 8a and the impression cylinder 9 are in contact with each other via the printed substrate W, and the image of the blanket 8a is the image of the printed substrate W. Is printed on. That is, the blanket 8a is the image range of the blanket body 8.
As shown in FIG. 5C, the peripheral surface portion of the blanket cylinder 8 to which the blanket 8a is not attached does not come into contact with the peripheral surface of the impression cylinder 9. That is, the peripheral surface portion of the blanket cylinder 8 to which the blanket 8a is not attached is the non-image range of the blanket cylinder 8.

The intermittent printing operation of the intermittent printing machine 100 according to the embodiment of the present invention will be described with reference to FIGS. 6, 7, and 8.
In the embodiment, the circumference of the plate cylinder 7, the circumference of the blanket cylinder 8, and the circumference of the impression cylinder 9 are the same.
The plate cylinder 7 and the blanket cylinder 8 continuously rotate at the same speed in opposite directions (clockwise direction for the plate cylinder 7 and counterclockwise direction for the blanket cylinder 8) as indicated by solid arrows during the intermittent printing operation. It is driven to rotate.
The impression cylinder 9 rotates in the clockwise direction as shown by the solid line arrow, that is, by driving in the forward rotation, the substrate W to be printed travels in the positive direction as shown by the solid line arrow, and is indicated by the dotted line arrow. By rotating in the counterclockwise direction, that is, driving in the reverse rotation, the substrate W to be printed travels in the opposite direction as shown by the dotted arrow. At this time, the step back roller 6 on the paper entry side and the step back roller 10 on the paper discharge side, which are not shown in FIGS. 6, 7, and 8, are driven in the forward rotation and the reverse rotation in synchronization with the impression cylinder 9. do.

The operation from the start of printing to the end of printing at the time of first printing (printing of the first page) will be described with reference to FIG.
FIG. 6 shows changes in the rotation angles of the blanket cylinder 8 and the impression cylinder 9 in chronological order from the start of the first printing to the end of printing.
As shown in FIG. 6A, the printing substrate W travels in the positive direction by driving the impression cylinder 9 in a forward rotation, and the tip 8a-1 of the blanket 8a comes into contact with the peripheral surface of the impression cylinder 9. By starting contact with the printed base material W, the image of the blanket 8a is started to be printed on the printed base material W. The tip 8a-1 of the blanket 8a is the end on the downstream side in the rotation direction of the blanket 8a.

From this state, the impression cylinder 9 is driven in a positive rotation at the same constant speed as the speed of the blanket cylinder 8, and the blanket cylinder 8 and the impression cylinder 9 are rotationally driven, so that the blanket is driven as shown in FIG. 6 (b). The first image is sequentially printed on the substrate W to be printed from 8a. As shown in FIG. 6 (c), the first printing is completed when the rear end 8a-2 of the blanket 8a comes into contact with the substrate W to be printed which is in contact with the peripheral surface of the impression cylinder 9.
The rear end 8a-2 of the blanket 8a is an upstream end of the blanket 8a in the rotational direction.
That is, the step back roller 6 on the paper entry side, the step back roller 10 on the paper discharge side, and the impression cylinder 9 are synchronously driven in a positive rotation at a constant speed to travel the substrate W to be printed in a positive direction at a constant speed. While the blanket 8a is brought into contact with the substrate W to be printed, the image of the blanket 8a is first printed on the substrate W to be printed.
The rotation angle α of the blanket cylinder 8 is an angle formed by a straight line b connecting the rotation center 8b of the blanket cylinder 8 and the rotation center 9c of the impression cylinder 9 and the rear end 8a-2 of the blanket 8a, and is the angle formed by the straight line b at the end of printing. The position is 0 degrees and the normal rotation direction is positive. The rotation angle β of the impression cylinder 9 is an angle formed by the straight line b and the rear end G-1 of the printed image G printed on the substrate W to be printed, and the position of the straight line b at the end of printing is set to 0 degree for normal rotation. The direction is positive. That is, α = 0 and β = 0 at the end of printing in FIG. 6 (c), and α and β are increased by driving the blanket cylinder 8 and the impression cylinder 9 in the forward rotation from the state of the end of printing, respectively.

The length of the printed image G first printed on the substrate W to be printed (distance from the rear end G-1 to the tip G-2 of the printed image G), that is, the print range for one page is the blanket 8a. It matches the size (distance from the front end 8a-1 of the blanket 8a to the rear end 8a-2). The rear end G-1 of the printed image G is an upstream end of the impression cylinder 9 in the forward rotation direction. The tip G-2 of the printed image G is the downstream end of the impression cylinder 9 in the forward rotation direction.
The rotation angle from the straight line b of the blanket cylinder 8 to the tip 8a-1 of the blanket 8a at the end of printing is the first blanket cylinder rotation angle α-1, and the straight line b of the impression cylinder 9 to the tip G-2 of the printed image G. The rotation angle up to is the first impression cylinder rotation angle β-1. Since the rotation drive speeds of the blanket cylinder 8 and the impression cylinder 9 are the same, the size of the blanket 8a and the length of the printed image G are the same, α-1 and β-1 have the same angle.
The printed image G is printed on the surface of the substrate W to be printed, but is shown inside the peripheral surface of the impression cylinder 9 in FIG. 6 for easy understanding. Also in FIGS. 7 and 8 described later, the printed image is shown inside the peripheral surface of the impression cylinder 9.

Since the impression cylinder 9 is driven in the forward rotation at a constant speed at the end of printing shown in FIG. 6 (c), the impression cylinder 9 is decelerated and forward-rotated after the printing is completed, the impression cylinder 9 is gradually stopped rotating, and printing is performed. The occurrence of slip between the base material W and the peripheral surface of the impression cylinder 9 is prevented, and the drive system of the impression cylinder 9 is prevented from being damaged. That is, if the impression cylinder 9 that is driven in the forward rotation at a constant speed is suddenly stopped rotating, it causes a slip between the substrate W to be printed and the peripheral surface of the impression cylinder 9, and the drive system of the impression cylinder 9 is caused. Unreasonable force acts on such things and causes a malfunction.
Since the impression cylinder 9 gradually stops rotating after printing is completed, the impression cylinder 9 is rotated forward by a predetermined rotation angle from the position at the end of printing shown in FIG. 6 (c) as shown in FIG. 6 (d). Rotation stops at the position. That is, the rotation angle β of the impression cylinder 9 at the rotation stop position is the second impression cylinder rotation angle β-2.

When the impression cylinder 9 has stopped rotating, the rotation angle α of the blanket cylinder 8 is the second blanket cylinder rotation angle α-2, as shown in FIG. 6D.
The second blanket cylinder rotation angle α-2 is larger than the second impression cylinder rotation angle β-2. That is, the blanket cylinder 8 is rotationally driven at a constant speed even after the printing is completed, but the impression cylinder 9 is decelerated and forward-rotated after the printing is completed, so α-2> β-2.
When the impression cylinder 9 is decelerated and forward-rotated by the second impression cylinder rotation angle β-2 from the position at the end of printing (β = 0), the substrate W to be printed and the blanket 8a are separated, and the substrate W to be printed is pressed. Since it is not sandwiched between the cylinder 9 and the blanket cylinder 8, slippage is likely to occur between the peripheral surface of the impression cylinder 9 and the substrate W to be printed.

The operation from the end of the first printing to the start of the second printing (printing of the second page) will be described with reference to FIG. 7.
FIG. 7 shows changes in the rotation angles of the blanket cylinder 8 and the impression cylinder 9 in chronological order from the rotation stop of the impression cylinder 9 to the start of the second printing.
As shown in FIG. 7A, the impression cylinder 9 whose rotation has stopped after the initial printing operation is accelerated and reverse-rotated as shown by the dotted arrow, and the substrate W to be printed is indicated by the dotted arrow. Run in the opposite direction.
As shown in FIG. 7B, the impression cylinder 9 is driven in the reverse rotation by the second impression cylinder rotation angle β-2, and the rear end G-1 of the printed image G first printed on the substrate W to be printed is printed. When the impression cylinder 9 is moved to the end position (β = 0), the impression cylinder 9 is set to a predetermined reverse rotation drive speed. The predetermined reverse rotation drive speed is the fastest reverse rotation drive speed, which is slower than the constant speed during printing.

The rotation angle α of the blanket cylinder 8 in the state shown in FIG. 7B is the third blanket cylinder rotation angle α-3. α-3> α-2.
After that, the impression cylinder 9 is decelerated and reversely rotated to gradually stop rotating the impression cylinder 9. When the impression cylinder 9 is stopped rotating, as shown in FIG. 7 (c), the rotation angle β of the impression cylinder 9 is the third impression cylinder rotation angle β − on the paper entry side from the position (β = 0) at the end of printing. The position is offset by 3.
The size of the third impression cylinder rotation angle β-3 is the same as that of the second impression cylinder rotation angle β-2. β-3 = β-2.
The rotation angle α of the blanket cylinder 8 rotates to the fourth blanket cylinder rotation angle α-4 (α-4> α-3), and the tip 8a-1 of the blanket 8a approaches the printing start position of the impression cylinder 9. There is. The angle formed by the tip 8a-1 of the blanket 8a and the straight line b is the fifth blanket body rotation angle α-5. α-5 = 360 degrees- (α-1 + α-4), and α-5> β-3.
Since the impression cylinder 9 gradually stops rotating, slip occurrence between the substrate W to be printed and the peripheral surface of the impression cylinder 9 is prevented, and a failure or the like does not occur in the drive system of the impression cylinder 9. ..

The step back roller 6 on the paper entry side and the step back roller 10 on the paper discharge side are rotationally driven in the same manner as the impression cylinder 9.
As shown in FIGS. 7 (a) to 7 (c), the substrate W to be printed has a gap between the peripheral surface portion of the blanket cylinder 8 to which the blanket 8a is not attached and the peripheral surface of the impression cylinder 9. Since the printed substrate W is not sandwiched between the impression cylinder 9 and the blanket cylinder 8 because it travels toward the paper entry portion 1B side (travels in the opposite direction), the impression cylinder 9 travels in the opposite direction. Slip is likely to occur between the peripheral surface and the substrate W to be printed.

As shown in FIG. 7 (c), the impression cylinder 9 is gradually driven in the forward rotation by accelerating and forward rotation driving the impression cylinder 9 from the state where the impression cylinder 9 has stopped rotating, and the substrate W to be printed is driven. Drive in the positive direction.
Then, when the rotation angle β of the impression cylinder 9 is driven to rotate forward by the third impression cylinder rotation angle β-3, as shown in FIG. 7D, the tip 8a of the blanket 8a is attached to the rear end G-1 of the printed image G. -1 contacts (β = 0).
In this state, the impression cylinder 9 is driven in a forward rotation at the same constant speed as the blanket cylinder, and the second printing is started. The step back roller 6 on the paper entry side and the step back roller 10 on the paper discharge side are rotationally driven in the same manner as the impression cylinder 9.
Since the impression cylinder 9 gradually starts to rotate, slippage between the substrate W to be printed and the peripheral surface of the impression cylinder 9 may be prevented, and a failure may occur in the drive system of the impression cylinder 9. do not have.
Therefore, the blanket cylinder 8 makes one rotation (360 degrees) at the time of the first printing. While the blanket cylinder 8 makes one rotation, the impression cylinder 9 rotates in the positive direction by the size (image range) of the blanket 8a that rotates during printing.

As shown in FIG. 7 (c), the impression cylinder 9 is driven to decelerate and reverse rotation to stop rotating, and then the impression cylinder 9 is driven to accelerate and forward rotation again to be positive until the start of printing as shown in FIG. 7 (d). Until the rotation is driven, the substrate W to be printed and the blanket 8a are separated from each other, and the substrate W to be printed is not sandwiched between the impression cylinder 9 and the blanket cylinder 8, so that the peripheral surface of the impression cylinder 9 and the substrate W to be printed Slip is likely to occur between them.
That is, the operation from the end of the first printing to the start of the second printing is that after the first printing is completed and the impression cylinder 9 stops rotating, the step back roller 6 on the paper entry side and the paper discharge side are operated. By synchronously driving the step back roller 10 and the impression cylinder 9 for acceleration reverse rotation drive, deceleration reverse rotation drive, and acceleration forward rotation drive, the substrate W to be printed is printed, and the rear end G-1 of the printed image G is second. It travels in the reverse direction and the forward direction so as to be the printing start position of.

The operation from the start of printing to the end of printing at the time of performing the second printing (printing of the second page) will be described with reference to FIG.
FIG. 8 shows changes in the rotation angles of the blanket cylinder 8 and the impression cylinder 9 in chronological order from the start of the second printing to the end of the second printing.
As shown in FIG. 8A, the impression cylinder 9 is positively applied at the same constant speed as the blanket cylinder 8 in a state where the rear end G-1 of the first printed image G and the tip 8a-1 of the blanket 8a are in contact with each other. Rotate drive to start the second print. As shown in FIG. 8B, the front end H-2 of the second printed image H is continuous with the rear end G-1 of the first printed image G.
When the impression cylinder 9 is driven by the first impression cylinder rotation angle β-1 forward rotation, as shown in FIG. 8C, the rear end H-1 of the second printed image H and the rear end 8a-2 of the blanket 8a become Matches and the second print ends.

From this state, by driving the impression cylinder 9 in a decelerating forward rotation, the impression cylinder 9 is rotated by the second impression cylinder rotation angle β-2 and stopped rotating as shown in FIG. 8 (d). That is, the second print is performed in the same manner as the first print.
The third and subsequent prints are performed in the same manner as the second print.

Based on FIG. 9, the rotation angle and rotation drive speed ratio of the impression cylinder 9 with respect to the rotation angle of the blanket cylinder 8 during the period from the end of printing to the start of printing and the end of printing again, that is, when one printing operation is performed. explain.
FIG. 9 is a chart (graph) showing the rotation angle and rotation drive speed ratio of the impression cylinder 9 with respect to the rotation angle of the blanket cylinder 8, and the horizontal axis is the rotation angle of the blanket cylinder 8 to show one printing operation. , 0 to 360 degrees. That is, the horizontal axis is the rotation angle α. The vertical axis shows the rotation angle of the impression cylinder 9 and the rotation drive speed ratio of the impression cylinder 9. The rotation angle of the impression cylinder 9 at the end of printing and the start of printing is set to 0 degrees, and the rotation angle during normal rotation drive is set. Is represented by a plus, and the rotation angle when driving in the reverse direction is represented by a minus. That is, the rotation angle of the impression cylinder 9 on the vertical axis is the rotation angle β. The rotation drive speed ratio is set to 100% during printing and 0% when the impression cylinder 9 is stopped rotating.

The change in the rotation drive speed ratio of the impression cylinder 9 is shown by the solid line X, and the rotation angle of the impression cylinder 9 is shown by the solid line Y.
Section 1 of FIG. 9 shows from the end of printing of FIGS. 6 (c) and 8 (c) to the stop of rotation of the impression cylinder 9 of FIGS. 6 (d) and 8 (d).
In section 1, the rotation drive speed ratio of the impression cylinder 9 smoothly changes from a constant speed (100%) during printing to 0% at which the impression cylinder 9 stops rotating, as shown by the solid line X. The rotation angle of the impression cylinder 9 smoothly changes from 0 degree to the second impression cylinder rotation angle β-2 as shown by the solid line Y.
The rotation angle of the blanket body 8 changes from 0 degrees to the second blanket body rotation angle α-2.

Section 2 of FIG. 9 shows the acceleration reverse rotation drive of the impression cylinder 9 of FIGS. 7A and 7B until the predetermined reverse rotation drive speed is reached.
In the section 2, as shown by the solid line X, the rotation drive speed ratio of the impression cylinder 9 smoothly changes from 0% to the rotation drive speed ratio which is a predetermined reverse rotation drive speed. As shown by the solid line Y, the rotation angle of the impression cylinder 9 smoothly changes from the second impression cylinder rotation angle β-2 to 0 degrees.
The rotation angle of the blanket body 8 changes from the second blanket body rotation angle α-2 to the third blanket body rotation angle α-3.
The magnitude of the change in the rotation angle of the blanket cylinder 8 is larger in the section 2 than in the section 1, because the change in the rotation drive speed ratio of the impression cylinder is gentler in the section 2 than in the section 1. Is.

Section 3 of FIG. 9 shows the process of decelerating and reverse rotation driving the impression cylinder 9 of FIGS. 7 (b) and 7 (c) until the rotation is stopped.
In the section 3, the rotation drive speed ratio of the impression cylinder 9 smoothly changes from the rotation drive speed ratio, which is a predetermined reverse rotation drive speed, to 0%, as shown by the solid line X. As shown by the solid line Y, the rotation angle of the impression cylinder 9 smoothly changes from 0 degree to the third impression cylinder rotation angle β-3.
The rotation angle of the blanket body 8 changes up to the fourth blanket body rotation angle α-4.
Section 4 of FIG. 9 shows that the impression cylinder 9 of FIGS. 7 (c) and 7 (d) is driven in an accelerated positive rotation to reach the printing start position at a constant printing speed.

In the section 4, the rotation drive speed ratio of the impression cylinder 9 smoothly changes from 0% to 100%, which is a constant positive rotation drive speed during printing, as shown by the solid line X. As shown by the solid line Y, the rotation angle of the impression cylinder 9 smoothly changes from the third impression cylinder rotation angle β-3 to 0 degrees.
The rotation angle of the blanket body 8 changes up to the sum of the fourth blanket body rotation angle α-4 and the fifth blanket body rotation angle α-5.
The magnitude of the change in the rotation angle of the blanket cylinder 8 is larger in the section 3 than in the section 4, because the change in the rotation drive speed ratio of the impression cylinder is gentler in the section 3 than in the section 4. Is. Sections 1 to 4 are non-printing ranges.
Section 5 of FIG. 9 indicates that printing is in progress, the rotation drive speed ratio of the impression cylinder 9 is 100% as shown by the solid line X, and the rotation angle of the impression cylinder 9 is from 0 degrees as shown by the solid line Y. It changes linearly up to 1 impression cylinder rotation angle β-1. Section 5 is the print range.

The change in the rotation drive speed ratio of the deceleration forward rotation drive of the impression cylinder 9 in the section 1 and the change in the rotation drive speed ratio of the acceleration forward rotation drive of the impression cylinder 9 in the section 4 are line-symmetrical.
The change in the rotation drive speed ratio of the acceleration reverse rotation drive of the impression cylinder 9 in the section 2 and the change in the rotation drive speed ratio of the deceleration reverse rotation drive of the impression cylinder 9 in the section 3 are line-symmetrical.
Then, the rotation drive speed ratio change from the constant speed of the impression cylinder 9 to the predetermined reverse rotation drive speed and the rotation drive speed ratio change from the predetermined reverse rotation drive speed to the constant speed follow a substantially U-shaped curve. And change smoothly.

FIG. 10 is a chart showing changes in the rotational drive speed of the impression cylinder, and shows the case of two printing speeds in which the rotational drive speed of the impression cylinder 9 is different with respect to the rotation angle of the blanket cylinder 8. Regardless of the printing speed, the speed change from the constant speed during printing of the impression cylinder 9 to the predetermined reverse rotation drive speed and the speed change from the predetermined reverse rotation drive speed to the constant speed during printing are substantially U-shaped. Since the impression cylinder 9 changes smoothly along the curve of the above, the speed of the impression cylinder 9 changes smoothly, and the substrate W to be printed smoothly changes its direction in the opposite direction and the forward direction, so that the pressure with the substrate W to be printed is changed. It is possible to prevent the occurrence of slip between the peripheral surface of the body 9 and accurately print on the substrate W to be printed.

As shown in FIG. 11, when a small-sized blanket 8a is attached to the blanket cylinder 8 and the impression cylinder 9 is rotationally driven and printed as in the previous embodiment, the impression cylinder 9 is accelerated and reversely driven after printing is completed. When the impression cylinder 9 is driven by deceleration reverse rotation and stops rotating, the fifth blanket cylinder rotation angle α-5 formed by the tip 8a-1 of the blanket 8a and the straight line b becomes larger than the angle shown in FIG. 7 (c).
Therefore, when the impression cylinder 9 is driven to accelerate and forward rotation to start printing, the rear end G-1 of the printed image G and the tip 8a-1 of the blanket 8a do not come into contact with each other, and printing cannot be performed correctly.

That is, in FIG. 12, as in FIG. 9, the change in the rotation drive speed ratio of the impression cylinder 9 is shown by the solid line X, and the rotation angle of the impression cylinder 9 is shown by the solid line Y, but the size of the blanket 8a is small. Since the rotation angle of the blanket cylinder 8 during the printing of the section 5 is small and the rotation angle of the blanket cylinder 8 from the end of printing to the start of printing of the impression cylinder 9 is large, the pressure is as in the previous embodiment. It is not possible to print correctly if the body is driven to rotate.
Therefore, as shown in FIG. 12, the change in the rotation drive speed ratio of the deceleration forward rotation drive of the impression cylinder 9 in the section 1, the change in the rotation drive speed ratio of the acceleration reverse rotation drive of the impression cylinder 9 in the section 2, and the impression cylinder 9 in the section 3. The change in the rotation drive speed ratio of the deceleration reverse rotation drive and the change in the rotation drive speed ratio of the acceleration forward rotation drive of the impression cylinder 9 in the section 4 are changed, and the rear end G-1 and the blanket 8a of the print image G are changed at the print start position. The tip 8a-1 of the above is brought into contact with each other. That is, in the case of the small blanket 8a, the second impression cylinder rotation angle β-2 and the third impression cylinder rotation angle β-3 are increased in accordance with the increase in the fifth blanket cylinder rotation angle α-5. ..

As shown in FIG. 13, when a large-sized blanket 8a is attached to the blanket cylinder 8 and the impression cylinder 9 is rotationally driven and printed as in the previous embodiment, the impression cylinder 9 is accelerated and reversely driven after printing is completed. When the impression cylinder 9 is driven by deceleration reverse rotation and stops rotating, the fifth blanket cylinder rotation angle α-5 formed by the tip 8a-1 of the impression cylinder 8a and the straight line b becomes smaller than the angle shown in FIG. 7 (c). ..
Therefore, when the impression cylinder 9 is driven to accelerate and forward rotation to start printing, the rear end G-1 of the printed image G and the tip 8a-1 of the blanket 8a do not come into contact with each other, and printing cannot be performed correctly.

That is, in FIG. 14, as in FIG. 9, the change in the rotation drive speed ratio of the impression cylinder 9 is shown by the solid line X, and the rotation angle of the impression cylinder 9 is shown by the solid line Y, but the size of the blanket 8a is large. Since the rotation angle of the blanket cylinder 8 during printing of the section 5 is large and the rotation angle of the blanket cylinder 8 from the end of printing to the start of printing of the impression cylinder 9 is small, the pressure is as in the previous embodiment. It is not possible to print correctly if the body is driven to rotate.
Therefore, as shown in FIG. 14, the change in the rotation drive speed ratio of the deceleration forward rotation drive of the impression cylinder 9 in the section 1, the change in the rotation drive speed ratio of the acceleration reverse rotation drive of the impression cylinder 9 in the section 2, and the impression cylinder in the section 3. The change in the rotation drive speed ratio of the deceleration reverse rotation drive of 9 and the change of the rotation drive speed ratio of the acceleration forward rotation drive of the impression cylinder 9 in the section 4 are changed, respectively, and the rear end G-1 of the print image G and the blanket are changed at the print start position. The tips 8a-1 of 8a are brought into contact with each other. That is, in the case of the large blanket 8a, the second impression cylinder rotation angle β-2 and the third impression cylinder rotation angle β-3 are reduced in accordance with the reduction of the fifth blanket cylinder rotation angle α-5. ..

When changing the number of printed pages per unit time by changing the printing speed, the rotation angle of the blanket cylinder 8 when the impression cylinder 9 starts decelerating from a constant speed and when the impression cylinder 9 reaches a constant speed is not changed. The acceleration of the forward / reverse rotation drive of 9 may be changed.
For example, as shown in FIG. 10, when the printing speed shown by the dotted line is slower than the printing speed shown by the solid line, the rotation angle of the blanket cylinder 8 when the impression cylinder 9 starts decelerating from a constant speed and The acceleration when the impression cylinder 9 is driven in the forward and reverse rotations is reduced without changing the rotation angle of the blanket cylinder 8 when the impression cylinder 9 reaches a constant speed.

Next, a configuration in which the substrate W to be printed is wound around the peripheral surface of the impression cylinder 9 will be described.
As shown in FIG. 4, the substrate W to be printed wraps around the peripheral surface of the impression cylinder 9 from the traveling path 15a on the paper entry side and reaches the traveling path 15b on the paper ejection side.
The travel path 15a on the paper entry side is a travel path on the upstream side in the travel direction when the substrate W to be printed travels in the forward direction, and a travel path on the downstream side in the travel direction when the substrate W to be printed travels in the opposite direction. Is.
The traveling path 15b on the paper ejection side is a traveling path on the downstream side in the traveling direction when the substrate W to be printed travels in the forward direction, and a traveling path on the upstream side in the traveling direction when the substrate W to be printed travels in the opposite direction. Is.
The base material W to be printed running between the blanket cylinder 8 and the impression cylinder 9 is wound around the peripheral surface of the impression cylinder 9 at a predetermined winding angle by the guide roller 40 on the paper entry side and the guide roller 41 on the paper discharge side. Be done.

The guide roller 40 on the paper entry side is provided on the traveling path 15a on the paper entry side.
The guide roller 41 on the paper ejection side is provided on the traveling path 15b on the paper ejection side.
By changing the positions of at least one of the guide roller 40 on the paper entry side and the guide roller 41 on the paper discharge side, the winding angle of the substrate W to be printed on the impression cylinder 9 peripheral surface changes.
The guide roller 40 on the paper entry side and the guide roller 41 on the paper discharge side are rollers that rotate freely and are not rotationally driven by a drive motor or the like.

As shown in FIG. 15, the guide roller 40 on the paper entry side is provided at a position closer to the paper entry portion 1B than the impression cylinder 9.
The position 40a where the peripheral surface of the guide roller 40 on the paper entry side and the substrate W to be printed come into contact is below the position 9a where the blanket cylinder 8 comes into contact with the blanket 8a on the peripheral surface of the impression cylinder 9. The base material W to be printed, which is located and runs on the path 15a on the paper entry side, is formed between the lower peripheral surface of the guide roller 40 on the paper entry side and the upper peripheral surface of the impression cylinder 9 on the paper entry side. The vehicle travels diagonally so that the position 40a in contact with 40 is low and the position where contact with the peripheral surface of the impression cylinder 9 starts is high.
Therefore, the printing base material W traveling on the paper entry side running path 15a starts winding around the peripheral surface of the impression cylinder 9 at the paper entry side winding start position (the entry starts in contact with the peripheral surface of the impression cylinder 9). (Position on the paper side) 16a is a position on the paper entry side of the impression cylinder 9 above the printing position 9a and lower than the printing position 9a.

The guide roller 41 on the paper ejection side is provided at a position closer to the paper entry portion 1B than the impression cylinder 9 and closer to the traveling path 15a on the paper entry side. The position 41a on the impression cylinder 9 side where the peripheral surface of the guide roller 41 on the paper ejection side and the substrate W to be printed start to come into contact is located above the lower position 9b on the peripheral surface of the impression cylinder 9, and is on the paper ejection side. The printed substrate W traveling on the impression cylinder 9 side of the guide roller 41 on the paper discharge side in the traveling path 15b is between the lower peripheral surface of the impression cylinder 9 and the upper peripheral surface of the guide roller 41 on the paper discharge side. , The position where the contact with the peripheral surface of the impression cylinder 9 starts is low, and the position 41a where the contact with the guide roller 41 on the paper ejection side starts is high. The lower position 9b of the peripheral surface of the impression cylinder 9 is an intersection of the printing position 9a, the straight line a passing through the center 9c of the impression cylinder 9, and the lower portion of the peripheral surface of the impression cylinder 9.
Therefore, the printing base material W traveling on the traveling path 15b on the paper ejection side starts winding on the peripheral surface of the impression cylinder 9 at the winding start position on the paper ejection side (discharging that starts contacting the peripheral surface of the impression cylinder 9). (Position on the paper side) 16b is a position on the paper entry side of the lower portion 9b of the peripheral surface of the impression cylinder 9 and higher than the lower position 9b.

That is, a straight line connecting the position 40a on the peripheral surface of the guide roller 40 on the paper entry side where the substrate W to be printed contacts and the winding start position 16a on the paper entry side on the peripheral surface of the impression cylinder 9 (the guide roller on the paper entry side). An extension of the traveling path 15a on the paper entry side between the 40 and the impression cylinder 9), the position 41a on the peripheral surface of the guide roller 41 on the paper discharge side where the substrate W to be printed is in contact, and the peripheral surface of the impression cylinder 9. The straight line connecting the winding start position 16b on the paper ejection side (extension line of the traveling path 15b on the paper ejection side between the guide roller 41 on the paper ejection side and the impression cylinder 9) intersects.
Therefore, the winding angle θ around which the substrate W to be printed is wound around the peripheral surface of the impression cylinder 9 is an angle larger than 180 degrees, which is 270 degrees in FIG. The contact area is wide, and the frictional force generated between the two is a large value.

The reason why the frictional force is a large value is as follows.
Since the substrate W to be printed is wound around the peripheral surface of the impression cylinder 9, the printed base material W is directed toward the center 9c of the impression cylinder 9 with respect to the impression cylinder 9 in the wound range. Force is generated.
As a reaction of this force, a normal force is generated in the range around the peripheral surface of the impression cylinder 9 on the substrate W to be printed.
Since the frictional force acting on the substrate W to be printed is proportional to the normal force with respect to the entire range in which the substrate W to be printed is wound around the peripheral surface of the impression cylinder 9, the substrate W to be printed is the circumference of the impression cylinder 9. The wider the area wrapped around the surface, the greater the frictional force.

Therefore, if the winding angle θ around which the substrate W to be printed is wound around the peripheral surface of the impression cylinder 9 is large, the frictional force generated between the substrate W to be printed and the peripheral surface of the impression cylinder 9 is large. It becomes a value.
If the frictional force generated between the printing substrate W and the peripheral surface of the impression cylinder 9 is a large value, the impression cylinder 9 is driven in the reverse rotation to drive the impression cylinder 9 in the opposite direction. It is possible to suppress the slip that occurs between the peripheral surface of the surface and the substrate W to be printed.

As shown in FIG. 4, a portion of the peripheral surface of the impression cylinder 9 on which the substrate W to be printed is wound (the winding start position 16a on the paper entry side and the winding start position 16b on the paper ejection side shown in FIG. 15). A nip roller 42 for the impression cylinder and a drying device 43 are provided so as to face the peripheral surface portion between them.
The nip roller 42 for the impression cylinder is provided in pressure contact with the peripheral surface of the impression cylinder 9, and the substrate W to be printed travels while being always sandwiched between the nip roller 42 for the impression cylinder and the peripheral surface of the impression cylinder 9. That is, the nip roller 42 for the impression cylinder presses the substrate W to be printed against the peripheral surface of the impression cylinder 9.
By providing the nip roller 42 for the impression cylinder, the frictional force generated between the substrate W to be printed and the peripheral surface of the impression cylinder 9 increases at the portion pressed by the nip roller 42 for the impression cylinder, and the frictional force becomes higher. It will be a large value.

Further, when the impression cylinder 9 is driven in the reverse direction to travel in the opposite direction on the printed base material W, the peripheral surface of the impression cylinder 9 and the peripheral surface of the blanket cylinder 8 are separated from each other, and the printed base material W is separated. Since it is not in contact with the blanket cylinder 8, the printed base material W traveling in the opposite direction is pressed against the peripheral surface of the impression cylinder 9 by the impression cylinder nip roller 42 (nip position 42a in FIG. 15). ), The downstream side in the traveling direction is pulled in the traveling direction.
When the substrate W to be printed is pulled in the traveling direction, a force is generated from the substrate W to be printed with respect to the peripheral surface of the impression cylinder 9 toward the center 9c of the impression cylinder 9. Due to this force, the air remaining between the peripheral surface of the impression cylinder 9 and the substrate W to be printed escapes and suppresses the formation of the air layer. Therefore, between the peripheral surface of the impression cylinder 9 and the substrate W to be printed. The frictional force of the air layer is less likely to decrease due to the air layer.

Further, the frictional force between the peripheral surface of the impression cylinder 9 and the substrate W to be printed increases due to the force from the substrate W to be printed toward the peripheral surface of the impression cylinder 9 toward the center of the impression cylinder 9. ..
In combination with these factors, when the impression cylinder 9, the step back roller 6 on the paper entry side, and the step back roller 10 on the paper discharge side are driven in reverse rotation to travel in the reverse direction on the substrate W to be printed. When the substrate W to be printed travels in the forward direction from the printing start position until the impression cylinder 9 stops rotating, and when the substrate W to be printed travels in the opposite direction travels in the forward direction from the printing start position (that is,). When the substrate W to be printed is separated from the blanket 8a and the substrate W to be printed is not sandwiched between the impression cylinder 9 and the blanket cylinder 8), the substrate W to be printed and the peripheral surface of the impression cylinder 9 are formed. No slip occurs between the two.
Therefore, it is possible to prevent the occurrence of variation in the print register.

Suppressing the formation of the air layer and increasing the frictional force between the peripheral surface of the impression cylinder 9 and the substrate W to be printed, as described above, is to increase the frictional force between the impression cylinder 9 of the impression base W to be pulled. The longer the length of the portion in contact with the peripheral surface (the length from the winding start position 16a on the paper entry side to the winding start position 16b on the paper ejection side shown in FIG. 15), the more effective it is.
Therefore, as shown in FIG. 15, in the impression cylinder nip roller 42, the nip position 42a that is in pressure contact with the peripheral surface of the impression cylinder 9 is closer to the guide roller 41 on the paper ejection side than the printing position 9a of the impression cylinder. It is provided as follows.
That is, the nip position 42a that is in pressure contact with the peripheral surface of the impression cylinder 9 of the impression cylinder 42 is more than the printing position 9a of the impression cylinder 9 when the substrate W to be printed travels in the opposite direction. It is the upstream side in the traveling direction (upstream side in the reverse rotation direction).

It is desirable that the nip position 42a is the position closest to the guide roller 41 on the paper ejection side so as not to exceed the winding start position 16b on the paper ejection side.
When the nip position 42a exceeds the winding start position 16b on the paper ejection side, as will be described later, when the nip roller 42 for the impression cylinder is separated from the peripheral surface of the impression cylinder 9, the impression cylinder 9 of the substrate W to be printed is separated. As the winding angle to the peripheral surface of the paper changes, the length of the traveling path also changes, so that the printing register is misaligned.
The nip roller 42 for the impression cylinder can be moved over a position where the pressure cylinder 9 is in pressure contact with the peripheral surface and a position where the pressure cylinder 9 is separated from the peripheral surface.

The mounting configuration of the nip roller 42 for the impression cylinder will be described with reference to FIGS. 16 and 17.
The machine frame 2A of the printing unit includes a frame 2A-1 on one operation side in a direction perpendicular to the traveling direction of the substrate W to be printed, and a frame 2A-2 on the other drive side.
The support shaft 50 of the guide roller 41 on the paper ejection side is axially positioned and rotatably attached to the frame 2A-1 on the operation side and the frame 2A-2 on the drive side, and is attached to the support shaft 50. The guide roller 41 on the paper ejection side is rotatably attached. Further, one end of the support shaft 50 in the length direction protrudes outward from the frame 2A-1 on the operation side.
The base end portion of the support arm 51 is fixedly attached to two positions separated from each other in the length direction of the support shaft 50 so as not to rotate. The nip roller shaft 52 is fixedly attached so as not to rotate across the tip portions of the two support arms 51, and the nip roller 42 for the impression cylinder is rotatably attached to the nip roller shaft 52.

A cylinder 53 for moving the nip roller is rotatably attached to the outer surface (surface) of the frame 2A-1 on the operation side of the machine frame 2A of the printing unit, and a lever is attached to the piston rod 53a of the cylinder 53 for moving the nip roller. The base end portion of 54 is rotatably attached. The support shaft 50 is fixedly attached to the tip of the lever 54 so as not to rotate.
Then, by extending the piston rod 53a of the cylinder 53 for moving the nip roller, the lever 54 rotates counterclockwise in FIG. 16, and the support shaft 50 rotates counterclockwise at a predetermined rotation angle to rotate the support arm 51. Rotates toward the peripheral surface of the impression cylinder 9, and the nip roller 42 for the impression cylinder moves to a position where it comes into pressure contact with the peripheral surface of the impression cylinder 9.

By reducing the piston rod 53a of the cylinder 53 for moving the nip roller, the lever 54 rotates clockwise in FIG. 16, the support shaft 50 rotates clockwise by a predetermined rotation angle, and the support arm 51 rotates the impression cylinder 9. The nip roller 42 for the impression cylinder moves to a position separated from the peripheral surface of the impression cylinder 9 by rotating in a direction away from the peripheral surface of the impression cylinder 9.
Therefore, during the printing operation, the nip roller 42 for the impression cylinder is moved to a position where it is in pressure contact with the peripheral surface of the impression cylinder 9 to prevent slippage, and during maintenance and inspection work, the nip roller 42 is separated from the peripheral surface of the impression cylinder 9. By moving to, maintenance and inspection work becomes easier.

When printing an image on the substrate W to be printed, the peripheral surface of the impression cylinder 9 and the blanket 8a of the blanket cylinder 8 are in contact with each other via the substrate W to be printed, so that the nip roller 42 for the impression cylinder is in contact. At least, slip does not occur between the peripheral surface of the impression cylinder 9 and the substrate W to be printed (see FIG. 6). Moreover, even if the nip roller 42 for the impression cylinder is separated from the peripheral surface of the impression cylinder 9, the position 41a on the impression cylinder 9 side and the impression cylinder 9 on the peripheral surface of the guide roller 41 on the paper ejection side start contact with the printed substrate W. The length of the running path 15b on the paper ejection side between the straight lines connecting the winding start positions 16b on the paper ejection side on the peripheral surface of 9 does not change. Therefore, even if the nip roller 42 for the impression cylinder is separated from the peripheral surface of the impression cylinder 9, the printing register does not vary (see FIG. 15).

As shown in FIG. 4, the drying device 43 fixes and dries the ink of the image printed on the substrate W to be printed. In this embodiment, since printing is performed using ultraviolet curable ink, a drying device that irradiates and dries ultraviolet rays is used. As the light source of ultraviolet rays, a mercury lamp, a metahara lamp, an LED lamp or the like can be appropriately selected, but an LED lamp is suitable in order to reduce the influence of heat on the substrate W to be printed.
The drying device 43 is provided between the printing position 9a of the impression cylinder 9 and the nip roller 42 for the impression cylinder 9. That is, the drying device 43 is provided on the upstream side in the forward rotation direction of the impression cylinder with respect to the nip roller 42 for the impression cylinder.
Therefore, since the nip roller 42 for the impression cylinder comes into contact with the ink of the printed image after the ink is fixed and dried, the image is not disturbed by the contact with the nip roller 42 for the impression cylinder.

The heat generated by the drying apparatus 43 causes the impression cylinder 9 and the substrate W to be printed to have a high temperature, and the substrate W to be printed may be adversely affected by the heat. In particular, when a flexible packaging material such as a film is used as the substrate W to be printed, it is easily affected by heat. As a bad influence of heat, the base material W to be printed is stretched by heat and the printing register is misaligned.
Therefore, a cooling device 72 is provided on the impression cylinder 9 to cool the impression cylinder 9 so that the impression cylinder 9 and the substrate W to be printed do not reach a high temperature that is adversely affected by heat.

The cooling device 72 of the impression cylinder 9 will be described with reference to FIGS. 18 and 19.
The impression cylinder 9 has a tubular shape having a hollow portion of the tubular body 60, one end face plate 61 that closes one opening of the tubular body 60, and the other end face plate 62 that closes the other opening of the tubular body 60. Is.
One support shaft 63 is provided on one end face plate 61, and the one support shaft 63 is rotatably supported by the frame 2A-1 on the operation side by an eccentric bearing 64.
The other end face plate 62 is provided with the other support shaft 65, and the other support shaft 65 is rotatably supported by the frame 2A-2 on the drive side by an eccentric bearing 64. Further, a motor fixing eccentric component 64a for fixing the drive motor 68 for the impression cylinder is attached to the other eccentric bearing 64.

A motor support frame 67 is attached to the drive side frame 2A-2 via a stay 66, and a motor fixing eccentric component 64a is rotatably attached to the motor support frame 67, and a drive motor 68 for an impression cylinder. Is attached to the eccentric component 64a for fixing the motor.
A rotation shaft (not shown) of the drive motor 68 for the impression cylinder and the other support shaft 65 are connected by a coupling (not shown).
The impression cylinder 9 is driven in a forward rotation and a reverse rotation by a drive motor 68 for the impression cylinder.
The drive motor 68 for the impression cylinder is independent of the drive motor (not shown) of the plate cylinder 7 and the blanket cylinder 8, the drive motor of the step back roller 6 on the paper entry side and the step back roller 10 on the paper discharge side. It is controlled synchronously with the drive motor of.

Therefore, the impression cylinder 9 is driven in the forward rotation and the reverse rotation in synchronization with the step back roller 6 on the paper entry side and the step back roller 10 on the paper discharge side.
A pipe for cooling water flow (not shown) is provided in the hollow portion of the impression cylinder 9. The pipe penetrates one end face plate 61 and one support shaft 63, protrudes outward from the frame 2A-1 on the operation side, and is connected to the cooling water supply pipe 70 and the cooling water discharge pipe 71 via the rotary joint 69. is doing. The cooling water supply pipe 70 is connected to the discharge side of the cooling water supply pump, and the cooling water discharge pipe 71 is connected to the cooling water tank.

Then, the cooling water flows into the pipe from the cooling water supply pipe 70, and the cooling water flows in the pipe and flows out from the cooling water discharge pipe 71.
In this way, the impression cylinder 9 is cooled by the cooling water flowing through the pipe, and constitutes the impression cylinder cooling device 72.
The center of rotation of each eccentric bearing 64 and the eccentric component 64a for fixing the motor and the center of rotation of the support shafts 63 and 65 are eccentric. The drive motor 68 for the impression cylinder rotates eccentrically at a predetermined rotation angle.
When the impression cylinder 9 rotates eccentrically, the position of the impression cylinder 9 with respect to the blanket cylinder 8 changes, and the contact pressure (printing pressure) between the peripheral surface of the impression cylinder 9 and the blanket 8a of the blanket cylinder 8 can be adjusted.

The rotation mechanism 73 will be described.
A rotary shaft 74 is rotatably attached over the frame 2A-1 on the operation side and the frame 2A-2 on the drive side. The worm gear 75 attached to the rotating shaft 74 meshes with the worm 77 attached to the shaft 76. The rotation shaft 74 rotates by rotating the handle 76a fixed to the shaft 76.
Fan-shaped gears 78 are attached to each eccentric bearing 64, and the gears 78 mesh with gears 79 attached to both sides of the rotating shaft 74 in the length direction.
Therefore, by rotating the shaft 76 with the handle 76a, each eccentric bearing 64 rotates at a predetermined rotation angle.

As shown in FIG. 1, a register adjusting device 80 is provided between each printing unit of the printing unit 2. Specifically, between the first printing unit 2a and the second printing unit 2b, between the second printing unit 2b and the third printing unit 2c, and between the third printing unit 2c and the fourth printing unit 2d. A register adjusting device 80 is provided between the 4th printing unit 2d and the 5th printing unit 2e, and between the 5th printing unit 2e and the 6th printing unit 2f, respectively.
The register adjustment device 80 adjusts the print register according to the length of the image to be printed in the vertical direction before starting printing.

In the conventional intermittent printing machine disclosed in Patent Document 1, the printing register is adjusted by moving the printing unit to change the distance between the printing units while the impression cylinder is stopped rotating. The method of adjusting the print register cannot be applied to the intermittent printing machine of the present invention.
The reason is that in the intermittent printing machine of the present invention, the substrate W to be printed is wound around the peripheral surface of the impression cylinder 9, so that when the printing units 2a to 2f are moved, the impression cylinder 9 also moves, and the impression cylinder 9 is moved. This is because the substrate W to be printed may be pulled and cut or loosened due to the movement.
The register adjusting device 80 of the present invention adjusts the printing register by changing the length of the path (the length of the paper path) of the substrate W to be printed between the printing units.
Therefore, the print register can be adjusted even if the substrate W to be printed is wrapped around the peripheral surface of the impression cylinder 9.

As shown in FIG. 4, the register adjusting device 80 includes a pull roller 81 on the paper entry side, a pull roller 82 on the paper ejection side provided below the pull roller 81 on the paper entry side, and a pull roller 81 on the paper entry side and ejection. It has a movable roller 83 that is provided between the pull roller 82 on the paper side and moves in the horizontal direction, and a guide roller 84 that is provided on the paper ejection side of the pull roller 82 on the paper ejection side.
The substrate W to be printed travels by sequentially winding from the pull roller 81 on the paper entry side to the movable roller 83, from the movable roller 83 to the pull roller 82 on the paper ejection side, and from the pull roller 82 on the paper ejection side to the guide roller 84.
That is, when the substrate W to be printed travels in the positive direction (solid line arrow direction), it winds around the movable roller 83 from the printing unit (first printing unit 2a) on the paper receiving side via the pull roller 81 on the paper receiving side and travels in the traveling direction. Is changed, the paper is wound around the pull roller 82 on the paper ejection side, the traveling direction is changed again, and the printer travels to the printing unit (second printing unit 2b) on the paper ejection side via the guide roller 84.

When the substrate W to be printed travels in the opposite direction (dotted line arrow direction), it winds around the pull roller 82 on the paper ejection side from the printing unit (second printing unit 2b) on the paper ejection side via the guide roller 84 to change the traveling direction. , It winds around the movable roller 83, changes the traveling direction again, and travels to the printing unit (first printing unit 2a) on the paper receiving side via the pull roller 81 on the paper receiving side.
The movable roller 83 can move between the position 83a on the paper entry side and the position 83b on the paper discharge side. As the movable roller 83 moves, the length of the traveling path 85a of the substrate W to be printed between the pull roller 81 on the paper entry side and the pull roller 82 on the paper discharge side changes. That is, the traveling path 85a between the pull roller 81 on the paper entry side and the pull roller 82 on the paper ejection side has a loop shape that is folded back by the movable roller 83. The length changes.
Therefore, the length of the traveling path 85a between the pull roller 81 on the paper entry side and the pull roller 82 on the paper ejection side changes, so that the printing position 9a of the first printing unit 2a and the printing position 9a of the second printing unit 2b The length of the traveling path 85 of the printing substrate W between the printing units (hereinafter referred to as the traveling path 85 of the printing substrate W between the printing units) changes.

When the movable roller 83 is at the position 83a on the paper entry side, the length of the traveling path 85 of the substrate W to be printed between the printing units is the shortest. When the movable roller 83 is at the position 83b on the paper ejection side, the length of the traveling path 85 of the substrate W to be printed between the printing units is the longest.
Therefore, when the movable roller 83 moves between the position 83a on the paper entry side and the position 83b on the paper ejection side, the length of the traveling path 85 of the substrate W to be printed between the printing units changes, so that before printing. You can adjust the print register. For example, the length of the traveling path 85 of the substrate W to be printed between the printing units is set to an integral multiple of the length in the vertical direction of the image to be printed.
The rollers 81, 82, 83, 84 are provided in the frame 80A of the register adjusting device 80, but the rollers 81, 82, 83, 84 are shown by solid lines for ease of understanding. ..

The pull roller 81 on the paper entry side and the pull roller 82 on the paper discharge side are rotationally driven and controlled by separate drive motors (not shown). Then, the pull roller 81 on the paper entry side and the pull roller 82 on the paper discharge side are driven in a forward rotation and a reverse rotation in synchronization with the step back roller 6 on the paper entry side and the step back roller 10 on the paper discharge side.
The movable roller 83 is rotatably attached to a moving body (not shown) provided so as to be movable in the frame body 80A. The movable roller 83 is moved by moving the moving body by a moving mechanism (not shown).
As the moving mechanism, a feed screw is rotated by a motor and the lead screw is screwed into a screw hole of a moving body, a rack and a pinion are used, a cylinder is used, and the like.

Since the substrate W to be printed is wound in a range of 180 degrees on the peripheral surface of the movable roller 83, even if the movable roller 83 moves, it is always wound in a range of 180 degrees and the winding angle does not change. The length of the traveling path 85 of the substrate W to be printed between the printing units can be accurately changed by twice the moving distance. However, since it is wound in the range of 180 degrees, the area in contact between the substrate W to be printed and the peripheral surface of the movable roller 83 is wide, and the running resistance of the substrate W to be printed increases. Therefore, when the printed base material W travels in the forward direction, slip is likely to occur between the peripheral surface of the pull roller 82 on the paper ejection side and the printed base material W, and the printed base material W moves in the opposite direction. When traveling, slip is likely to occur between the peripheral surface of the pull roller 81 on the paper entry side and the substrate W to be printed.
Therefore, a pull roller nip roller 86 on the paper entry side that presses against the peripheral surface of the pull roller 81 on the paper entry side and a pull roller nip roller 87 on the paper discharge side that presses against the pull roller 82 on the paper discharge side are provided.

Then, the substrate W to be printed is sandwiched between the peripheral surface of the pull roller 81 on the paper entry side and the nip roller 86 for the pull roller on the paper entry side, and the peripheral surface of the pull roller 82 on the paper ejection side and the nip roller 87 for the pull roller on the paper ejection side. The substrate W to be printed is sandwiched between the two.
Therefore, the frictional force between the peripheral surface of the pull roller 81 on the paper entry side and the substrate W to be printed becomes large, slip does not occur between the two, and the peripheral surface of the pull roller 82 on the paper discharge side and the printed material W are printed. Since the frictional force between the base material W and the base material W becomes large and slip does not occur between the two, the printing register does not vary due to the provision of the register adjusting device 80.
The pull roller nip roller 86 on the paper entry side is movable over a position where the pull roller 81 on the paper entry side is in pressure contact with the peripheral surface and a position where the pull roller 81 is separated from the peripheral surface.
The pull roller nip roller 87 on the paper ejection side is movable over a position where it is in pressure contact with the peripheral surface of the pull roller 82 on the paper ejection side and a position where it is separated.

The mounting configuration of the pull roller nip roller 86 on the paper entry side will be described with reference to FIGS. 20 and 21. The frame body 80A includes a frame 80A-1 on one operation side in a direction perpendicular to the traveling direction of the substrate W to be printed, and a frame 80A-2 on the other drive side.
The support shaft 90 is positioned axially and rotatably attached over the frame 80A-1 on the operation side and the frame 80A-2 on the drive side of the frame body 80A, and is mounted rotatably in the length direction of the support shaft 90. One end of the frame 80A-1 on the operation side protrudes to the outside. The base end portions of the support arm 91 are fixedly attached to two positions separated from each other in the length direction of the support shaft 90 so as not to rotate. The nip roller shaft 92 is fixedly attached so as not to rotate across the tip portions of the two support arms 91, and the pull roller nip roller 86 on the paper entry side is rotatably attached to the nip roller shaft 92.

A cylinder 93 for moving the nip roller is rotatably attached to the outer surface (surface) of the frame 80A-1 on the operation side of the frame 80A, and the base of the lever 94 is attached to the piston rod 93a of the cylinder 93 for moving the nip roller. The ends are rotatably attached. The support shaft 90 is fixedly attached to the tip of the lever 94 so as not to rotate.
Then, by extending the piston rod 93a of the cylinder 93 for moving the nip roller, the lever 94 rotates clockwise in FIG. 20, the support shaft 90 rotates clockwise by a predetermined rotation angle, and the support arm 91 enters. It rotates toward the peripheral surface of the pull roller 81 on the paper side, and the nip roller 86 for the pull roller on the paper entry side moves to a position where it is in pressure contact with the peripheral surface of the pull roller 81 on the paper entry side.
By reducing the piston rod 93a of the cylinder 93 for moving the nip roller, the lever 94 rotates counterclockwise in FIG. 20, the support shaft 90 rotates counterclockwise by a predetermined rotation angle, and the support arm 91 enters. It rotates in a direction away from the peripheral surface of the pull roller 81 on the paper side, and the nip roller 86 for the pull roller on the paper entry side moves to a position separated from the peripheral surface of the pull roller 81 on the paper entry side.
Since the pull roller nip roller 87 on the paper ejection side is also attached in the same manner, the same member is designated by the same reference numeral and the description thereof will be omitted.

Further, by moving the pull roller nip roller 86 on the paper entry side and the pull roller nip roller 87 on the paper discharge side to separate positions, the work of passing the substrate W to be printed into the register adjusting device 80 before the start of printing (paper threading). Work) and roller maintenance and inspection work will be easier.
When moving the movable roller 83, the nip roller 42 for the impression cylinder, the nip roller 86 for the pull roller on the paper entry side, the nip roller 87 for the pull roller on the paper discharge side, and other nip rollers are moved to separate positions to move the movable roller 83. The substrate W to be printed is made to move while sliding along each roller.

In the intermittent printing machine of the present invention, the substrate W to be printed is wound around the peripheral surface of the impression cylinder 9 of each printing unit 2a to 2f, and the nip roller 42 for the impression cylinder is pressure-welded to the peripheral surface of each impression cylinder 9. is doing. The pull roller nip roller 86 on the paper entry side is pressed against the peripheral surface of the pull roller 81 on the paper entry side of each register adjusting device 80, and the pull roller nip roller 87 on the paper discharge side is pressed against the peripheral surface of the pull roller 82 on the paper discharge side. Is in pressure contact.
For this reason, even if the rotation speed of the step back roller 6 on the paper entry side and the rotation speed of the step back roller 10 on the paper discharge side are controlled, the printed matter runs on each of the printing units 2a to 2f and each register adjusting device 80. Since the tension of the base material W is not uniform, the printing units 2a to 2f and the register adjusting device 80 can be adjusted by controlling the rotation speeds of the step back roller 6 on the paper entry side and the step back roller 10 on the paper discharge side. The tension of the traveling substrate W to be printed cannot be set to a predetermined value.

Therefore, in the intermittent printing machine of the present invention, the step back roller 6 on the paper entry side, the impression cylinder 9 of each printing unit 2a to 2f, the pull roller 81 on the paper entry side of each register adjusting device 80, the pull roller 82 on the paper ejection side, By independently rotating and driving the step back rollers 10 on the paper ejection side and controlling the rotation speed of each roller independently, the printed substrate W traveling on each printing unit 2a to 2f and each register adjusting device 80. The tension of is set to a predetermined value. This tension adjusting operation is sequentially performed for each printing unit from the first printing unit 2a to the sixth printing unit 2f.

For example, as shown in FIG. 22, the tension of the substrate W to be printed traveling in the section 17a between the step back roller 6 on the paper entry side and the impression cylinder 9 of the first printing unit 2a, the tension of the first printing unit 2a. The tension of the substrate W to be printed running on the section 17b between the impression cylinder 9 and the pull roller 81 on the paper entry side, and the subject running on the section 17c between the pull roller 81 on the paper entry side and the pull roller 82 on the paper discharge side. The tension of the printing substrate W, the tension of the substrate W to be printed running in the section 17d between the pull roller 82 on the paper ejection side and the impression cylinder 9 of the second printing unit 2b, and the impression cylinder 9 of the second printing unit 2b. The tension of the base material W to be printed running on the section 17e between the pull roller 81 on the paper entry side and the base material W to be printed running on the section 17f between the pull roller 81 on the paper entry side and the pull roller 82 on the paper discharge side. The tension of the substrate W to be printed running in the section 17g between the pull roller 82 on the paper ejection side and the impression cylinder 9 of the third printing unit 2c, the tension of the impression cylinder 9 of the third printing unit 2c and the paper entry side. The tension of the printed substrate W traveling in the section 17h between the pull roller 81 and the tension of the printed substrate W traveling in the section 17i between the pull roller 81 on the paper entry side and the pull roller 82 on the paper ejection side, respectively. Control.

Further, the tension of the substrate W to be printed traveling in the section 17j between the pull roller 82 on the paper ejection side and the impression cylinder 9 of the fourth printing unit 2d, and the tension of the impression cylinder 9 of the fourth printing unit 2d and the pull roller on the paper entry side. The tension of the base material W to be printed running in the section 17k between 81, the tension of the base material W to be printed running in the section 17l between the pull roller 81 on the paper entry side and the pull roller 82 on the paper discharge side, and the paper discharge. The tension of the substrate W to be printed traveling in the section 17 m between the pull roller 82 on the side and the impression cylinder 9 of the fifth printing unit 2e, and between the impression cylinder 9 of the fifth printing unit 2e and the pull roller 81 on the paper entry side. The tension of the printed substrate W traveling in the section 17n, the tension of the printed substrate W traveling in the section 17o between the pull roller 81 on the paper entry side and the pull roller 82 on the paper ejection side, and the pull roller 82 on the paper ejection side. The tension of the substrate W to be printed traveling on the section 17p between the impression cylinder 9 of the sixth printing unit 2f and the section between the impression cylinder 9 of the sixth printing unit 2f and the step back roller 10 on the paper ejection side. The tension of the substrate W to be printed traveling on 17q is controlled respectively.

The tension control of the substrate W to be printed traveling in each section makes the rotation speed of the roller on the downstream side in the traveling direction of the substrate W to be printed faster than the rotation speed of the roller on the upstream side in the traveling direction, and is downstream. The amount of the base material W to be printed by the roller on the side is set to be larger than the amount of the base material W to be printed by the roller on the upstream side.
For example, when traveling in the positive direction of the substrate W to be printed, the tension of the substrate W to be printed traveling in the section 17q between the impression cylinder 9 of the sixth printing unit 2f and the step back roller 10 on the paper ejection side. Is greater than the tension of the substrate W to be printed running in the section 17a between the step back roller 6 on the paper entry side and the impression cylinder 9 of the first printing unit 2a, and the printing base traveling in the other section. The tension of the material W is the same as the tension of the substrate W to be printed running in the section 17a between the step back roller 6 on the paper entry side and the impression cylinder 9 of the first printing unit 2a.

When traveling in the reverse direction of the substrate W to be printed, the tension of the substrate W to be printed traveling in the section 17a between the step back roller 6 on the paper entry side and the impression cylinder 9 of the first printing unit 2a is increased. The tension of the printed substrate W traveling in the section 17q between the impression cylinder 9 of the sixth printing unit 2f and the step back roller 10 on the paper ejection side is made larger than the tension of the printed substrate W traveling in the other section. The tension is the same as the tension of the substrate W to be printed running in the section 17q between the impression cylinder 9 of the sixth printing unit 2f and the step back roller 10 on the paper ejection side.

In the intermittent printing machine of the present invention, images were printed on the substrate W to be printed in three different states, and the variation in the printing register in the top-bottom direction was measured for each state. The variation in the print register was measured by the automatic register device 38 and the monitoring device 39.
In the first state, the nip roller 42 for the impression cylinder is separated from the peripheral surface of the impression cylinder 9, the pull roller 81 on the paper entry side can freely rotate without being driven to rotate, and the nip roller 86 for the pull roller on the paper entry side is The pull roller 81 on the paper entry side is separated from the peripheral surface of the pull roller 81 on the paper entry side to be the same as the guide roller, and the pull roller 82 on the paper discharge side can freely rotate without being driven to rotate, and is for the pull roller on the paper discharge side. With the nip roller 87 separated from the peripheral surface of the pull roller 82 on the paper ejection side and the pull roller 82 on the paper ejection side similar to the guide roller, the impression cylinder 9 is placed on the step back roller 6 on the paper entry side and the step on the paper ejection side. Forward rotation drive and reverse rotation drive are performed in synchronization with the back roller 10.
In the second state, in the first state, the impression cylinder 9 is pressed against the peripheral surface of the impression cylinder 9 with the impression cylinder 9 nip roller 42 pressed against the paper entry side step back roller 6 and the paper discharge side step back. Forward rotation drive and reverse rotation drive are performed in synchronization with the roller 10.

In the third state, the nip roller 42 for the impression cylinder is pressed against the peripheral surface of the impression cylinder 9, the nip roller 86 for the pull roller on the paper entry side is pressed against the peripheral surface of the pull roller 81 on the paper entry side, and the pull roller on the paper discharge side is pressed. With the nip roller 87 pressed against the peripheral surface of the pull roller 82 on the paper ejection side (with the nip rollers 42, 86, 87 moved to the pressure contact position), the impression cylinder 9 and the step back roller 6 on the paper entry side are pressed. The step back roller 10 on the paper ejection side, the pull roller 81 on the paper entry side, and the pull roller 82 on the paper ejection side are synchronously driven in the forward rotation and the reverse rotation.
As a result, the occurrence of variation in the print register was the most in the case of printing in the first state, the second most in the case of printing in the second state, and the least in the case of printing in the third state.
From this, it can be seen that providing the nip roller 42 for the impression cylinder and the nip rollers 86, 87 for the pull roller (pull rollers 81, 82) is effective in preventing the variation in the printing register.

In this embodiment, the register adjusting device 80 is provided between the printing units, but the register adjusting device 80 may not be provided. In that case, a pull roller is provided in the traveling path 85 of the base material W to be printed between the printing units so that the base material W to be printed does not vary or sag.
For example, as shown in FIG. 23, pull rollers 110 are provided on the side of the paper entry side and the side of the paper discharge side in the traveling path 85 of the base material W to be printed between the printing units, and the base material W to be printed is the circumference of each pull roller 110. It is wrapped around the surface. Each pull roller 110 is rotatably provided in the frame body 120 between the printing units. Each pull roller 110 is a separate drive motor (not shown), and is driven in forward rotation and reverse rotation in synchronization with the step back roller 6 on the paper entry side and the step back roller 10 on the paper discharge side, respectively.

Therefore, the printed substrate W traveling on the traveling path 85 between the printing units does not vary or sag.
Further, a pull roller nip roller 111 for pressing the printed substrate W wound around the peripheral surface of each pull roller 110 against the peripheral surface of the pull roller 110 is provided, and the peripheral surface of each pull roller 110 and the pull roller nip roller 111 are provided. Each of the base materials W to be printed is sandwiched.
Therefore, the frictional force between the peripheral surface of each pull roller 110 and the substrate W to be printed becomes large, slip does not occur between the two, and the print register varies due to the provision of the pull roller 110. There is no such thing.
The nip roller 111 for each pull roller is movable over a position where it is in pressure contact with the peripheral surface of each pull roller 110 and a position where it is separated from each other.

For example, the pair of support arms 113 are fixed to the support shaft 112 rotatably attached to the frame body 120, and the shaft 114 is fixed between the pair of support arms 113. The pull roller nip roller 111 is rotatably attached to the shaft 114.
The lever 116 rotated by the cylinder 115 is fixed to the support shaft 112, and the rotation of the lever 116 causes the support shaft 112 to rotate at a predetermined rotation angle, the support arm 113 rotates, and the pull roller nip roller 111 becomes a pull roller. The 110 is moved to a position separated from the pressure contact position. This configuration is the same as the configuration for moving the pull roller nip roller of the register adjusting device 80.

In addition, three or more pull rollers 110 may be provided. That is, at least two pull rollers 110 may be provided.
Further, a movable roller may be provided between the two pull rollers 110 in the travel path 85 of the substrate W to be printed, or between the pull roller 110 and the printing unit, or both so that the length of the travel path can be changed. You may do it.

1A ... Paper feeding unit, 1B ... Paper receiving unit, 2 ... Printing unit, 2a ... First printing unit, 2b ... Second printing unit, 2c ... Third printing unit, 2d ... Fourth printing unit, 2e ... Fifth printing Unit, 2f ... 6th printing unit, 2A ... machine frame, 2A-1 ... operation side frame, 2A-2 ... drive side frame, 3A ... paper ejection unit, 3B ... post-processing unit, 4 ... paper feed device, 5 ... Shock absorber on the paper entry side, 6 ... Step back roller on the paper entry side, 7 ... Plate cylinder, 7a ... Printing plate, 8 ... Blanket cylinder, 8a ... Blanket, 9 ... Impression cylinder, 9a ... Printing position, 10 ... Step back roller on the paper ejection side, 11 ... Shock absorber on the paper ejection side, 12 ... Winding device, 15a ... Paper entry side running path, 15b ... Paper ejection side running path, 16a ... Paper entry side winding start Position, 16b ... Paper ejection side winding start position, 40 ... Paper entry side guide roller, 41 ... Paper ejection side guide roller, 42 ... Paper ejection nip roller, 43 ... Drying device, 72 ... Cooling device, 80 ... Register adjustment device, 81 ... Pull roller on the paper entry side, 82 ... Pull roller on the paper ejection side, 83 ... Movable roller, 85 ... Running path of the substrate to be printed between printing units, 86 ... Nip roller for the pull roller on the paper entry side, 87 ... Nip roller for pull roller on the paper ejection side, 110 ... Pull roller, 111 ... Nip roller for pull roller.

Claims (9)

A paper receiving section for feeding out the substrate to be printed, a printing section having a plurality of printing units for printing an image on the printing substrate sent out from the paper receiving section, and a printing substrate on which an image is printed are discharged. Equipped with a paper ejection section
The paper-entry portion includes a shock absorber on the paper-entry side that stores the substrate to be printed in a loop, a forward rotation drive that travels the substrate to be printed in the forward direction, and a reverse rotation that travels the substrate to be printed in the reverse direction. It has a step back roller on the paper entry side that is driven,
The printing unit has an impression cylinder, an image range in contact with the peripheral surface of the impression cylinder, and a blanket cylinder having a non-image range not in contact with the peripheral surface of the impression cylinder.
The paper ejection unit is printed with a forward rotation drive that travels in the positive direction of the substrate to be printed and a step back roller on the output side that is driven in the reverse rotation that travels in the reverse direction of the substrate to be printed. It has a shock absorber on the discharge side that stores the substrate to be printed in a loop shape.
By synchronously driving the step back roller on the paper entry side and the step back roller on the paper discharge side in a forward rotation, the substrate to be printed is driven in the positive direction, and the peripheral surface of the impression cylinder and the above are described. An image is printed on the substrate to be printed in the image range of the blanket body, and the step back roller on the paper entry side and the step back roller on the paper discharge side are synchronously driven in reverse rotation to drive the print base. In an intermittent printing machine in which the material is run in the opposite direction through a gap between the peripheral surface of the impression cylinder and the non-image range of the blanket cylinder.
A guide roller on the paper entry side and a guide roller on the paper discharge side are used to wind the substrate to be printed, which passes between the peripheral surface of the impression cylinder and the blanket cylinder, around the peripheral surface of the impression cylinder at a predetermined winding angle. Provide,
A nip roller for the impression cylinder is provided to press the substrate to be printed wound around the peripheral surface of the impression cylinder against the peripheral surface of the impression cylinder.
When traveling in the forward direction on the substrate to be printed, the impression cylinder is driven in a forward rotation in synchronization with the step back roller on the paper entry side and the step back roller on the paper discharge side, and the substrate to be printed is reversed. When traveling in the direction, the impression cylinder is driven in reverse rotation in synchronization with the step back roller on the paper entry side and the step back roller on the paper discharge side.
A drying device for drying the substrate to be printed wrapped around the peripheral surface of the impression cylinder and a cooling device for the impression cylinder for cooling the impression cylinder are provided.
The drying device is an intermittent printing machine characterized in that it is located on the upstream side in the forward rotation direction of the impression cylinder with respect to the nip roller for the impression cylinder. In the intermittent printing machine according to claim 1,
The guide roller on the paper entry side and the guide roller on the paper discharge side are an extension line of the traveling path on the paper entry side between the guide roller on the paper entry side and the impression cylinder, and the guide roller on the paper discharge side. An intermittent printing machine provided so as to intersect the extension line of the traveling path on the paper ejection side between the impression cylinder and the impression cylinder. In the intermittent printing machine according to claim 1 or 2.
The impression cylinder is driven in a positive rotation at the same constant speed as the blanket cylinder when the blanket cylinder rotates in the image range from the printing start position and prints an image on the substrate to be printed.
When the blanket cylinder rotates in a non-image range from the printing end position, the impression cylinder is decelerated forward rotation driven from the constant speed to stop rotation, and after the rotation stop, acceleration reverse rotation drive is performed to a predetermined reverse rotation drive speed. , The deceleration reverse rotation drive is performed from the predetermined reverse rotation drive speed to stop the rotation, and after the rotation stop, the acceleration forward rotation drive is performed to the constant speed to accelerate the forward rotation drive to the rear end of the printed image printed on the substrate to be printed and the blanket cylinder. Intermittent printing machine with the tip of the printing range in contact. In the intermittent printing machine according to claim 3.
The change in the rotation drive speed ratio of the deceleration forward rotation drive of the impression cylinder and the change in the rotation drive speed ratio of the acceleration forward rotation drive are line-symmetrical.
The change in the rotation drive speed ratio of the acceleration reverse rotation drive of the impression cylinder and the change in the rotation drive speed ratio of the deceleration reverse rotation drive are line-symmetrical.
The change in the rotation drive speed ratio from the constant speed of the impression cylinder to the predetermined reverse rotation drive speed and the change in the rotation drive speed ratio from the predetermined reverse rotation drive speed to the constant speed are substantially U-shaped curves. Intermittent printing machine that changes smoothly along the line. In the intermittent printing machine according to any one of claims 1 to 4.
A register adjusting device is provided between the printing units, and the register adjusting device is an intermittent printing machine having a configuration in which the length of the path of the substrate to be printed between the printing units is changed to adjust the printing register. .. In the intermittent printing machine according to claim 5.
The register adjusting device has a pull roller on the paper entry side, a pull roller on the paper discharge side, and a movable roller, and by moving the movable roller, the pull roller on the paper entry side and the pull roller on the paper discharge side can be obtained. With a configuration that changes the length of the running path between
Both of the pull rollers are driven in a forward rotation to travel in the forward direction of the substrate to be printed and in the reverse direction of the substrate to be printed in synchronization with the step back roller on the paper entry side and the step back roller on the paper discharge side. An intermittent printing machine provided with nip rollers for pull rollers, which are driven in reverse rotation and are wound around the peripheral surfaces of both pull rollers and press the substrate to be printed against the peripheral surfaces of both pull rollers. In the intermittent printing machine according to claim 6.
The rotation speed of the step back roller on the paper entry side, the rotation speed of the step back roller on the paper discharge side, the rotation speed of the impression cylinder of each printing unit, and the pull roller on the paper entry side of each register adjusting device. An intermittent printing machine that can control the rotation speed and the rotation speed of the pull roller on the paper ejection side separately. In the intermittent printing machine according to any one of claims 1 to 4.
At least two pull rollers around which the substrate to be printed is wound are provided on the path of the substrate to be printed between the printing units, and the pull rollers are a step back roller on the paper entry side and a step on the paper discharge side. Synchronized with the back roller, a forward rotation drive for traveling the substrate to be printed in the forward direction and a reverse rotation drive for traveling in the reverse direction on the substrate to be printed were driven and wound around the peripheral surface of each pull roller. An intermittent printing machine provided with a nip roller for a pull roller that presses the substrate to be printed against the peripheral surface of each pull roller. In the intermittent printing machine according to any one of claims 1 to 8, the intermittent printing machine in which the substrate to be printed is a film.

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