JP6990952B1 - Rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary printing press capable of stabilizing the accuracy of reference point alignment. A rotary printing press 1 having a transport device for transporting a web-shaped paper W, a plurality of printing devices, a plurality of sensors for detecting a reference point mark M1 printed on the paper W, and a control device 15. Is. The plurality of printing devices are arranged side by side at arbitrary intervals on the transport path, and a plate having a reference point mark printing unit 8a is placed on each plate cylinder with reference to the plate cylinder reference point X of the plate cylinder of the printing device. It will be pasted. The plurality of sensors are located on the downstream side of the paper W in the transport direction from the axis P of the plate cylinder by a predetermined distance for each printing device. The control device 15 detects the distance from the axis P of the plate cylinder of the printing device to the sensor and the reference point mark M1 printed on the base material by the plate attached to the plate cylinder. The plate reference point Y with respect to the plate cylinder reference point X is calculated for each printing apparatus from the amount of paper W conveyed by the feed roller 3 up to this point. [Selection diagram] FIG. 5

Description

The present invention relates to a rotary printing press.

Conventionally, there is known a rotary printing press that continuously prints on a web-shaped substrate that is continuously conveyed at regular intervals. The rotary printing press includes a plurality of printing devices according to the number of colors to be printed. The plurality of printing devices are located at predetermined intervals along the transfer line of the base material. The rotary printing press prints patterns, characters, and the like in different colors on the base material by the plurality of printing devices. In the rotary printing press, the printing device on the downstream side aligns (aligns) the printing position of the printing device on the downstream side with respect to the patterns, characters, etc. printed on the substrate by the printing device on the upstream side. Print on the substrate.

In the rotary printing press, when fixing a plate on which a printing pattern, characters, etc. are formed on a plate cylinder of each printing device, the position shift of the plate with respect to a reference point of the plate cylinder and between the plurality of printing devices. The phase shift of the above-mentioned plate occurs. The rotary printing press needs to minimize the displacement of the positions of the respective plates attached to the plate cylinders of the plurality of printing devices in order to perform the registration with high accuracy. Therefore, in the rotary printing press, there is known a rotary printing press capable of performing reference point alignment for adjusting the position of the plate between the plurality of printing devices before printing. For example, as in Patent Document 1.

The rotary printing press described in Patent Document 1 has a plate cylinder of the plurality of printing devices in a state where the plurality of printing devices are located so that the distance between the plurality of printing devices is an integral multiple of the peripheral length of the plate. A register mark (cross mark) is printed on a substrate conveyed at a low speed of about 30 m / min by the plate fixed to the plate. The rotary printing press photographs the plurality of printed registration marks with a camera or the like. The operator of the rotary printing press prints the registration mark as the reference from the position of the other registration mark when the registration mark arbitrarily selected from the plurality of registration marks taken is used as a reference. Calculate the relative misalignment of other plates with respect to. The operator adjusts the reference point to adjust the phase of the other plate with the plate on which the register mark as the reference is printed as a reference.

The rotary printing press prints the register mark on the base material conveyed at a low speed in order from the printing device on the upstream side. Therefore, the position of the register mark printed by the plurality of printing devices is affected by the tension fluctuation of the base material during transportation and the tension fluctuation of the base material when the plurality of printing devices print the register mark. receive. Further, the printing position of the register mark used as the reference is changed by the tension fluctuation. Therefore, the relative position of the other plate with respect to the one plate on which the reference mark is printed is affected by the magnitude of the tension fluctuation of the base material. Therefore, it is difficult for the rotary printing press described in Patent Document 1 to stabilize the accuracy of reference point alignment.

Patent No. 3373478

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotary printing press capable of stabilizing the accuracy of reference point alignment.

A rotary printing press according to an embodiment of the present invention has a transport device for transporting a web-shaped substrate and a plate cylinder that rotates a plate according to the transport speed of the substrate, and the substrate is used to rotate the plate. The plurality of printing devices for printing on the printing press, the plurality of sensors for detecting the mark for the reference point printed on the substrate by the plurality of printing devices, and the transport device and the plurality of printing devices are independently controlled. It has a possible control device.

The plurality of printing devices are arranged side by side at arbitrary intervals on the transport path of the base material, and a plate having a reference point mark printing portion for printing a mark for the reference point is in the circumferential direction of each plate cylinder. It is attached to the plate cylinder with the reference point of. The plurality of sensors are located in each of the printing devices at a distance of a predetermined distance from the axis of the plate cylinder on the downstream side in the transport direction of the base material. In the control device, the sensor detects the distance from the axis of the plate cylinder of the printing device to the sensor and the mark for the reference point printed on the base material by the plate attached to the plate cylinder. The position of the plate in the circumferential direction with respect to the reference point in the circumferential direction of the plate cylinder is calculated for each printing device from the amount of the base material conveyed by the transfer device.

In the above configuration, the plate is based on the known distance from the axis of the plate cylinder of the printing device to the sensor and the amount of the base material conveyed until the sensor detects the mark for the reference point. The position of the plate in the circumferential direction with respect to the reference point in the circumferential direction of the cylinder is calculated for each printing apparatus. That is, the control device calculates the amount of misalignment of the plate in the plurality of printing devices as an absolute value from the reference point of the plate cylinder. Therefore, the relative deviation of the plate between the plurality of printing devices is corrected based on the absolute value from the reference point of the plate cylinder to which the plate is attached. That is, in the rotary printing press of the present application, the influence of the tension fluctuation of the base material is suppressed in the correction of the relative positional deviation of the plate among the plurality of printing devices. As a result, the accuracy of reference point alignment can be stabilized.

From another point of view, the rotary printing press according to the embodiment of the present invention preferably includes the following configurations. The transport device has a feed roller that feeds the base material from the paper feed roll, and a pull roller that feeds the base material paid out by the feed roller onto the take-up roll. The control device transports the base material by equalizing the rotation speed of the feed roller and the rotation speed of the pull roller in a state where a predetermined tension is generated in the base material, and the printing device causes the reference point. The mark for the reference point is printed on the base material, and the amount of the base material transported by the transfer device until the sensor detects the mark for the reference point is calculated.

In the above configuration, the rotary press stabilizes the base material by generating a predetermined tension on the base material when printing a mark for a reference point, and at the same time, the rotation speed of the feed roller and the pull roller. By making the rotation speeds of the above equal to each other, the fluctuation of the tension is suppressed without applying the tension higher than the predetermined tension to the base material during transportation. Therefore, the shape of the reference point mark printing portion of the plate is appropriately printed on the base material. Further, since the expansion and contraction of the base material during transportation is suppressed, the mark for the reference point printed on the base material is conveyed to the sensor while maintaining the shape at the time of printing. That is, the rotary printing press of the present application suppresses the influence of the tension fluctuation of the base material in the correction of the relative positional deviation of the plate among the plurality of printing devices. As a result, the accuracy of reference point alignment can be stabilized.

From another point of view, the rotary printing press according to the embodiment of the present invention preferably includes the following configurations. The mark for the reference point is a rectangular shape whose sides are located in the transport direction of the base material. When the sensor detects a side portion of the rectangular mark for the reference point on the downstream side in the transport direction of the base material, the control device reduces the transport speed of the base material by the transport device, and the sensor. In the circumferential direction of the plate cylinder based on the amount of the base material transported by the transfer device until the side portion of the rectangular mark for the reference point on the upstream side in the transport direction of the base material is detected. The position of the plate in the circumferential direction with respect to the reference point is calculated.

In the above configuration, the rotary printing press reduces the transfer speed of the base material when the sensor detects a side portion of the mark for the reference point on the downstream side in the transfer direction. Therefore, the rotary printing press can detect the side portion of the mark for the reference point on the upstream side in the transport direction with high accuracy by the sensor. That is, the rotary printing press of the present application suppresses variation in the detection position of the side portion of the mark for the reference point on the upstream side in the transport direction by the sensor by reducing the transport speed of the base material. As a result, the accuracy of reference point alignment can be stabilized.

From another point of view, the rotary printing press according to the embodiment of the present invention preferably includes the following configurations. The control device calculates the position of the plate in the circumferential direction with respect to the reference point in the circumferential direction of the plate cylinder in the printing device one by one in order from the printing device on the downstream side.

In the above configuration, in the rotary printing press, only one of the plurality of printing devices is in contact with the base material. That is, in the rotary printing press of the present application, the influence of the tension fluctuation of the base material is suppressed in the correction of the relative positional deviation of the plates among the plurality of printing devices. As a result, the accuracy of reference point alignment can be stabilized.

Further, the rotary printing press prints and detects the mark for the reference point one by one from the printing press located on the downstream side on the transport path among the plurality of printing presses. That is, the mark for the reference point is not printed by the other printing device on the upstream side of the printing device that prints and detects the mark for the reference point. Therefore, one printing device that prints and detects the mark for the reference point prints the mark for the reference point on the mark for the reference point printed on the substrate by the other printing device. There is nothing to do. Further, the sensor for detecting the mark for the reference point printed on the base material by one printing device does not detect the mark for the reference point printed on the base material by the other printing device. .. This makes it possible to prevent erroneous detection of the sensor and stabilize the accuracy of reference point alignment.

The terminology used herein is used for the purpose of defining only specific embodiments and is not intended to limit the invention by said terminology. Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs.

The following disclosure should be considered as an example of the invention and is not intended to limit the invention to the particular embodiments set forth in the drawings or description below.

According to one embodiment of the present invention, the accuracy of reference point alignment can be stabilized.

FIG. 1 is a schematic diagram of a rotary printing press according to an embodiment of the present invention. FIG. 2 is a schematic plan view of a plate used in a rotary printing press according to an embodiment of the present invention. FIG. 3 is a control block diagram of a rotary printing press according to an embodiment of the present invention. FIG. 4 is a process diagram of a reference point adjusting process of the rotary printing press according to the embodiment of the present invention. FIG. 5 is a schematic view in the axial direction showing the positional relationship of the plates in the axial direction of the plate cylinder of the rotary printing press according to the embodiment of the present invention. FIG. 6 is a schematic view in the radial direction showing the positional relationship of the plates in the radial direction of the plate cylinder of the rotary printing press according to the embodiment of the present invention. FIG. 7 is a schematic view showing the positional relationship between the axis of the plate cylinder and the reference point mark printed on the base material in the reference point alignment step of the rotary printing press according to the embodiment of the present invention. FIG. 8 is a schematic diagram showing a plate correction amount in the plate position correction step of the rotary printing press according to the embodiment of the present invention.

(First Embodiment)
First, the rotary printing press 1 which is one embodiment of the rotary printing press according to the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic diagram showing the configuration of a rotary printing press 1. FIG. 2 is a schematic plan view of the first edition 8A, the second edition 8B, and the third edition 8C used in the rotary printing press 1. FIG. 3 is a control block diagram of the rotary printing press 1. In the present embodiment, the rotary printing press 1 has three printing devices for printing a single color. Further, in the present embodiment, the rotary printing press 1 shall print on paper W as a base material.

As shown in FIG. 1, the rotary printing press 1 is an intermittent rotary printing press that prints while intermittently transporting a base material. Further, the rotary printing machine 1 is a letterpress printing machine. The rotary printing press 1 includes a paper feed roll support shaft 2, a feed roller 3, a first printing device 4A, a second printing device 4B, a third printing device 4C, a pulling roller 12, a take-up roll support shaft 13, and a guide roller 14. It has a control device 15.

The paper feed roll support shaft 2 rotatably supports the paper feed roll W1 in which the web-shaped paper W before printing is wound up in a roll shape. The paper feed roll support shaft 2 is located on the most upstream side in the transport direction of the base material. The paper feed roll support shaft 2 is inserted into the tubular core material of the paper feed roll W1. The paper feed roll support shaft 2 may be configured as a part of the automatic feeding device.

The feed roller 3 which is a supply unit is a drive roller that feeds out the paper W from the paper feed roll W1 and feeds it to the downstream side. The feed roller 3 is located on the downstream side of the paper feed roll support shaft 2 and on the upstream side of the first printing apparatus 4A. The feed roller 3 is positioned so as to be in contact with the back surface of the paper W, which is the non-printable surface. Paper W is wound around the feed roller 3 in a range where the central angle is 90 degrees or more and less than 180 degrees. The feed roller 3 is driven by a servomotor (not shown). The feed roller 3 can control the rotation angle, the paper feed rate, the tension of the paper W, and the like by the control device 15. Further, the feed roller 3 can be synchronized with the pull roller 12.

The first printing apparatus 4A prints the figure of the first plate 8A on the surface of the paper W in a single color. The first printing apparatus 4A includes an inkwell 5A, a mounting roller 6A, a first plate cylinder 7A, a first plate 8A, an impression cylinder 9A, a first reference point alignment sensor 10A, and a first registration sensor 11A.

The inkwell 5A is a container filled with ink to be printed. The wearing roller 6A is a roller that supplies the ink stored in the ink pot 5A to the first plate 8A attached to the first plate cylinder 7A. A part of the outer peripheral surface of the wearing roller 6A is in contact with the ink stored in the inkwell 5A. Further, a part of the outer peripheral surface of the wearing roller 6A comes into contact with the first plate 8A attached to the first plate cylinder 7A. As a result, the wearing roller 6A can adhere the ink adhered to the outer surface of the inkwell 5A to the first plate 8A of the first plate cylinder 7A. The wearing roller 6A is mechanically interlocked and connected to the first plate cylinder 7A.

The first plate body 7A brings the first plate 8A into contact with the paper W at an appropriate position and timing. The first plate 8A is attached to the outer peripheral surface of the first plate cylinder 7A with an adhesive tape or the like. The first plate cylinder 7A is located on the front surface side, which is the printing surface of the paper W. The first plate 8A attached to the outer peripheral surface of the first plate body 7A can come into contact with the wearing roller 6A. Further, in the first plate cylinder 7A, the plate attached to the outer peripheral surface can come into contact with the surface of the paper W. The first version cylinder 7A is driven by a servomotor (not shown). The first plate cylinder 7A can control the rotation angle or the rotation speed by the control device 15.

As shown in FIGS. 1 and 2, the first edition 8A is a plate-shaped member that transfers a pattern, characters, and the like onto paper W. The first edition 8A is a letterpress plate in this embodiment. The first plate 8A is formed in an arc shape that can be attached to the tubular first plate cylinder 7A (see FIG. 4). The inner peripheral surface of the first plate 8A has a curvature equal to the curvature of the outer peripheral surface of the first plate cylinder 7A. The outer peripheral surface of the first plate 8A has a printing surface. The first edition 8A has a symbol printing unit 8 for printing a symbol and a reference point mark printing unit 8a for printing a reference point mark M1 (see FIG. 7) which is a mark for a reference point. Further, the first edition 8A has a register mark printing unit 8b for printing the register mark M2 (see FIG. 7), which is a register mark. The reference point mark printing unit 8a is a rectangular convex portion that prints a rectangular mark whose side portion is located in the transport direction of the paper W when the first plate 8A is attached to the first plate cylinder 7A.

As shown in FIG. 1, the impression cylinder 9A is a roller that presses the paper W against the first plate 8A attached to the first plate cylinder 7A. The impression cylinder 9A is located on the back surface side of the paper W. Further, the outer peripheral surface of the impression cylinder 9A can come into contact with the back surface of the paper W. The impression cylinder 9A is positioned so as to face the first plate cylinder 7A with the paper W interposed therebetween. That is, the first plate cylinder 7A and the impression cylinder 9A are located so as to sandwich the paper W. The distance between the impression cylinder 9A and the first edition cylinder 7A can be adjusted. Thereby, the impression cylinder 9A can adjust the force for pressing the paper W against the plate. The impression cylinder 9A is mechanically interlocked and connected to the first edition cylinder 7A.

The first reference point alignment sensor 10A is a sensor that detects the reference point mark M1 which is a reference point mark printed on the paper W. The first reference point alignment sensor 10A is, for example, a photoelectric sensor having a light emitting unit and a light receiving unit. The first reference point adjustment sensor 10A detects the light projected from the issuing unit to the reference point mark M1 by the light receiving unit. The first reference point adjustment sensor 10A detects the presence / absence of the reference point mark M1 by changing the amount of received light. The first reference point alignment sensor 10A is located on the downstream side of the first plate cylinder 7A. The first reference point alignment sensor 10A is located at a distance of a known sensor distance L1 from the axis P of the first plate cylinder 7A. The first reference point alignment sensor 10A is positioned so that the light emitting portion and the light receiving portion face each other with respect to the surface of the paper W. Further, the first reference point alignment sensor 10A detects the downstream side portion M1a (see FIG. 7) and the upstream side portion M1b (see FIG. 7) of the reference point mark M1 printed on the transport. It is located like.

The first registration sensor 11A is a sensor that detects the rectangular registration mark M2 printed on the paper W. The first register matching sensor 11A is, for example, a photoelectric sensor having a light emitting unit and a light receiving unit. The first register matching sensor 11A detects the light projected from the issuing unit to the mark by the light receiving unit. The first registration sensor 11A detects the position of the registration mark M2 by changing the amount of light received. The first registration sensor 11A is located on the downstream side of the first plate cylinder 7A. The first register matching sensor 11A is located at a distance of a known sensor distance L1 from the axis P of the first plate cylinder 7A. The first register matching sensor 11A is positioned so that the light emitting portion and the light receiving portion face each other with respect to the surface of the paper W. Further, the first register alignment sensor 11A is in a direction perpendicular to the transport direction of the paper W and a direction parallel to the surface of the paper W with respect to the first reference point alignment sensor 10A when viewed in the transport direction of the paper W. It is misaligned in the width direction of a certain paper W. That is, the first register alignment sensor 11A does not overlap with the first reference point alignment sensor 10A when viewed in the transport direction of the paper W. Therefore, the first registration sensor 11A does not erroneously detect the reference point mark M1.

The second printing apparatus 4B prints the figure of the second plate 8B on the surface of the paper in a single color different from that of the first plate. The second printing apparatus 4B includes an inkwell 5B, a mounting roller 6B, a second plate cylinder 7B, a second plate 8B, an impression cylinder 9B, a second reference point alignment sensor 10B, and a second registration sensor 11B. The second printing device 4B is located on the downstream side of the first printing device 4A. The second printing apparatus 4B is separated from the axis P of the first plate cylinder 7A in the first printing apparatus 4A by a known interval P2. The configuration of the second printing device 4B is the same as the configuration of the first printing device 4A.

The second reference point alignment sensor 10B and the second registration sensor 11B are located apart from the axis P of the second plate cylinder 7B by a known sensor distance L2. The second register matching sensor 11B is displaced in the width direction of the paper W with respect to the second reference point matching sensor 10B when viewed in the transport direction of the paper W. The second reference point alignment sensor 10B may overlap with the first reference point alignment sensor 10B when viewed in the transport direction of the paper W. The second register sensor 11B overlaps with the first register sensor 11A when viewed in the transport direction of the paper W. The second reference point alignment sensor 10B detects the reference point mark M1 printed on the paper W by the second plate 8B. The second registration sensor 11B detects the registration mark M2 for registration detected by the first registration sensor 11A.

The third printing apparatus 4C prints the figure of the third edition 8C on the surface of the paper W in a single color different from that of the first edition 8A and the second edition 8B. The third printing apparatus 4C has an inkwell 5C, a mounting roller 6C, a third plate cylinder 7C, a third plate 8C, an impression cylinder 9C, a third reference point alignment sensor 10C, and a third registration sensor 11C. The third printing device 4C is located on the downstream side of the second printing device 4B. The third printing apparatus 4C is separated from the axis P of the second plate cylinder 7B in the second printing apparatus 4B by a known interval P3. The configuration of the third printing device 4C is the same as the configuration of the second printing device 4B.

The third reference point alignment sensor 10C and the third registration sensor 11C are located apart from the axis P of the third plate cylinder 7C by a known sensor distance L3. The third register matching sensor 11C is displaced in the width direction of the paper W with respect to the third reference point matching sensor 10C when viewed in the transport direction of the paper W. The third reference point alignment sensor 10C may overlap with the first reference point alignment sensor 10A and the second reference point alignment sensor 10B when viewed in the transport direction of the paper W. The third register sensor 11C overlaps with the second register sensor 11B when viewed in the transport direction of the paper W. The third reference point alignment sensor 10C detects the reference point mark M1 printed on the paper W by the third plate 8C. The third registration sensor 11C detects the registration mark M2 detected by the first registration sensor 11A and the second registration sensor 11B.

The first printing device 4A, the second printing device 4B, and the third printing device 4C are located side by side on the transport path of the paper W. The first printing device 4A, the second printing device 4B, and the third printing device 4C attach the ink filled in the inkwells 5A, 5B, and 5C to the first plate cylinder 7A by the rollers 6A, 6B, and 6C. It is supplied to the 2nd edition 8B attached to the 1st edition 8A, the 2nd edition cylinder 7B, or the 3rd edition 8C attached to the 3rd edition cylinder 7C. The first printing device 4A, the second printing device 4B, and the third printing device 4C have a paper W between the first plate cylinder 7A, the second plate cylinder 7B, the third plate cylinder 7C, and the impression cylinders 9A, 9B, 9C. Is printed on the paper W from the upstream side with the ink adhering to the first plate 8A, the second plate 8B, and the third plate 8C at a density corresponding to the printed content. The first printing device 4A, the second printing device 4B, and the third printing device 4C press the paper W against each plate by the impression cylinders 9A, 9B, and 9C. At this time, the first edition cylinder 7A, the second edition cylinder 7B, the third edition cylinder 7C, and the impression cylinders 9A, 9B, and 9C have the peripheral speeds of the printed surfaces of the first edition 8A, the second edition 8B, and the third edition 8C. Is rotating at a rotation speed that matches the transport speed of the paper W.

The pulling roller 12 which is a collecting unit is a driving roller that pulls the paper W drawn out from the paper feed roll W1 and feeds it into the take-up roll W2 on the downstream side. The tension roller 12 is located on the downstream side of the third printing apparatus 4C and on the upstream side of the take-up roll support shaft 13. The pull roller 12 is positioned so as to be in contact with the back surface of the paper W. Paper W is wound around the pull roller 12 in a range where the central angle is 90 degrees or more and less than 180 degrees. The tension roller 12 is driven by a servomotor (not shown). The tension roller 12 can control the transport position, transport speed, tension, etc. of the paper W by the control device 15. Further, the pull roller 12 can be synchronized with the feed roller 3.

The take-up roll support shaft 13 is a drive shaft that drives the take-up roll W2 that winds up the web-shaped paper W after printing into a roll shape. The take-up roll support shaft 13 is located on the most downstream side in the transport direction of the paper W. The take-up roll support shaft 13 is driven by a servomotor (not shown). The take-up roll support shaft 13 is inserted into the tubular core material of the paper feed roll W1. The paper feed roll support shaft 2 may be configured as a part of the automatic ejection device.

The plurality of guide rollers 14 are rollers that guide the paper W so that the web-shaped paper W is conveyed along a predetermined conveying line. The plurality of guide rollers 14 are located around the paper feed roll support shaft 2, the feed roller 3, the pull roller 12, and the take-up roll support shaft 13. Of the plurality of guide rollers 14, the guide roller 14 located in the vicinity of the paper feed roll support shaft 2 and the feed roller 3 winds the paper W around the feed roller 3. Similarly, among the plurality of guide rollers 14, the pull roller 12 and the guide roller 14 located in the vicinity of the paper feed roll support shaft 2 wind the paper W around the pull roller 12.

As shown in FIG. 3, the control device 15 controls the feed roller 3, the first printing device 4A, the second printing device 4B, the third printing device 4C, the pulling roller 12, and the take-up roll support shaft 13. In the control device 15, the CPU, ROM, RAM, HDD and the like are substantially connected by a bus. Alternatively, the control device 15 may be configured to include a one-chip LSI or the like. The control device 15 contains various programs and data for controlling the operations of the feed roller 3, the first printing device 4A, the second printing device 4B, the third printing device 4C, the pulling roller 12, and the take-up roll support shaft 13. It is stored.

The control device 15 is connected to the feed roller 3 and the pull roller 12. The control device 15 controls at least one of the rotation angle, rotation speed, and torque of the feed roller 3 and the tension roller 12. Further, the control device 15 can control the transport position, transport speed and tension of the paper W by interlocking at least one of the rotation angle, rotation speed and torque of the feed roller 3 and the tension roller 12.

The control device 15 is connected to the first printing device 4A, the second printing device 4B, and the third printing device 4C. The control device 15 controls at least one of the rotation angle and the rotation speed of each plate cylinder in the first printing device 4A, the second printing device 4B, and the third printing device 4C. Further, the control device 15 includes at least one of the rotation angle and rotation speed of the feed roller 3 and the pull roller 12, and the rotation of each plate cylinder in the first printing device 4A, the second printing device 4B, and the third printing device 4C. By interlocking at least one of the angle and the rotation speed, the transfer position and transfer speed of the paper W and the rotation angle and rotation speed of each plate cylinder in the first printing device 4A, the second printing device 4B, and the third printing device 4C. Can be linked.

The control device 15 is connected to the first reference point alignment sensor 10A, the second reference point alignment sensor 10B, and the third reference point alignment sensor 10C. The control device 15 can acquire the detection signal of the reference point mark M1 from the first reference point alignment sensor 10A, the second reference point alignment sensor 10B, and the third reference point alignment sensor 10C.

The control device 15 is connected to the first registration sensor 11A, the second registration sensor 11B, and the third registration sensor 11C. The control device 15 can acquire the detection signal of the register mark M2 from the first registration sensor 11A, the second registration sensor 11B, and the third registration sensor 11C.

The control device 15 is connected to the take-up roll support shaft 13. The control device 15 controls at least one of the rotation angle and the rotation speed of the take-up roll support shaft 13. The control device 15 interlocks at least one of the rotation angle and the rotation speed of the feed roller 3 and the tension roller 12 with at least one of the rotation angle and the rotation speed of the take-up roll support shaft 13 to form the paper W. The winding amount of the paper W can be controlled based on the transport position and the transport speed.

The rotary printing press 1 configured in this way controls the transport position, transport speed, and tension of the paper W by the feed roller 3 and the pull roller 12, while controlling the first printing device 4A, the second printing device 4B, and the third printing. The symbols of the first plate 8A, the second edition 8B, and the third edition 8C are printed by the apparatus 4C in an overlapping manner. At this time, the rotary printing press 1 rotates each plate cylinder of the first printing device 4A, the second printing device 4B, and the third printing device 4C at a constant speed. On the other hand, the rotary printing press 1 controls the transport position of the paper W with respect to each plate cylinder to control the printing position on the paper W surface. As a result, the rotary printing press 1 can narrow the distance between adjacent printing portions regardless of the size of the plate with respect to each plate cylinder.

Next, the reference point alignment step S100 of the rotary printing press 1 will be described with reference to FIGS. 1 and 4 to 8. FIG. 4 is a process chart of the reference point alignment step S100 of the rotary printing press 1. FIG. 5 shows the positions of the 1st edition 8A, the 2nd edition 8B, and the 3rd edition 8C as viewed in the direction of the axis P of the 1st edition cylinder 7A, the 2nd edition cylinder 7B, and the 3rd edition cylinder 7C in the rotary printing press 1. It is a schematic diagram showing a relationship. FIG. 6 shows the positional relationship between the first edition 8A, the second edition 8B, and the third edition 8C as viewed in the radial direction of the first edition cylinder 7A, the second edition cylinder 7B, and the third edition cylinder 7C in the rotary printing press 1. It is a schematic diagram which shows. FIG. 7 shows the positional relationship between the axis P of the first plate cylinder 7A, the second plate cylinder 7B, and the third plate cylinder 7C in the reference point alignment step S100 of the rotary printing press 1 and the reference point mark M1 printed on the paper W. It is a schematic diagram showing. FIG. 8 is a schematic diagram showing the correction amounts of the first plate 8A, the second plate 8B, and the third plate 8C in the plate position correction step S130 of the rotary printing press 1.

As shown in FIG. 4, the reference point adjusting step S100 is based on the position in the circumferential direction of each plate attached to each plate cylinder of the first printing device 4A, the second printing device 4B, and the third printing device 4C. This is a control that corrects the relative misalignment of each plate. The reference point adjusting step S100 includes a tension adjusting step S110 that keeps the tension of the paper W constant, a plate position detecting step S120 that detects the position of the plate attached to the plate cylinder of each printing apparatus, and a relative position of each plate. It has a plate position correction step S130 for correcting the above.

As shown in FIGS. 1, 5 and 6, the first plate 8A is attached to the first plate cylinder 7A of the first printing apparatus 4A. The second plate 8B is attached to the second plate cylinder 7B of the second printing apparatus 4B. The third plate 8C is attached to the third plate cylinder 7C of the third printing apparatus 4C. At this time, the 1st edition 8A, the 2nd edition cylinder 7B, and the 3rd edition 8C are attached to each plate cylinder by the operator's eyes.

The first edition cylinder 7A, the second edition cylinder 7B, and the third edition cylinder 7C have a plate cylinder reference point X which is a reference point in the circumferential direction. When the plate cylinder reference point X of the first plate cylinder 7A, the second plate cylinder 7B, and the third plate cylinder 7C is located above the axis P of each plate cylinder in the vertical direction, the control device 15 rotates the plate cylinder. Is defined as 0 degrees.

The first edition 8A, the second edition 8B, and the third edition 8C have a reference point mark printing unit 8a for printing the reference point mark M1 which is a mark for the reference point. In the first edition 8A, the second edition 8B, and the third edition 8C, the side portion M1b on the upstream side in the transport direction in the reference point mark printing portion 8a when attached to each plate cylinder is set as the plate reference point Y.

The first plate 8A is attached to the outer peripheral surface of the first plate cylinder 7A so that the plate reference point Y substantially coincides with the plate cylinder reference point X of the first plate cylinder 7A. The second plate 8B is attached to the outer peripheral surface of the second plate cylinder 7B so that the plate reference point Y substantially coincides with the plate cylinder reference point X of the second printing apparatus 4B. The third plate 8C is attached to the outer peripheral surface of the third plate cylinder 7C so that the plate reference point Y substantially coincides with the plate cylinder reference point X of the third printing apparatus 4C. At this time, the 1st edition 8A, the 2nd edition cylinder 7B, and the 3rd edition 8C are attached to each plate cylinder by the operator's eyes. Further, the radius of rotation from the axis P of each plate cylinder to the printing surface of the first plate 8A, the second plate 8B, and the third plate 8C attached to each plate cylinder is defined as the radius D.

In the tension adjusting step S110, the control device 15 feeds the paper W to the downstream side at the first transport speed V1 which is a constant transport speed by the feed roller 3, and pulls the paper W to the downstream side by the pull roller 12. At this time, the control device 15 controls so that the rotation speed of the pull roller 12 is higher than the rotation speed of the feed roller 3. That is, the pulling roller 12 rotates at a rotation speed faster than the first transport speed V1 of the paper W. The pulling roller 12 rotates with a rotational force exceeding the static frictional force between the outer peripheral surface and the paper W, so that the outer peripheral surface slides with respect to the paper W. A dynamic frictional force is generated between the outer peripheral surface of the pull roller 12 and the paper W. As a result, the pulling roller 12 applies tension to the paper W by the dynamic friction force while transporting the paper W at the first transport speed V1. The paper W stretches in the transport direction according to the tension.

When tension is applied to the paper W by the tension roller 12, the control device 15 makes the rotation speed of the tension roller 12 equal to the rotation speed of the feed roller 3. That is, the pulling roller 12 rotates at a rotation speed equal to the first transport speed V1 of the paper W. At this time, the outer peripheral surface of the pull roller 12 does not slip with respect to the paper W. A static frictional force is generated between the outer peripheral surface of the pull roller 12 and the paper W. The pulling roller 12 pulls the paper W downstream at the first transport speed V1 while keeping the amount of elongation of the paper W constant by the static frictional force. The paper W is conveyed at the first transfer speed V1 in a state where a predetermined tension is applied between the feed roller 3 and the pull roller 12. At this time, the tension of the paper W is maintained at a predetermined tension, and the tension fluctuation during transportation is suppressed.

In the plate position detection step S120, the control device 15 uses the first edition 8A, the second edition 8B, and the third edition 8C with respect to the plate cylinder reference point X of the first plate cylinder 7A, the second plate cylinder 7B, and the third plate cylinder 7C. The position of the plate reference point Y in the circumferential direction is detected. The control device 15 detects the plate reference point Y of the first plate 8A, the second plate 8B, and the third plate 8C on the most downstream side of the first printing device 4A, the second printing device 4B, and the third printing device 4C. The second printing device 4B and the first printing device 4A are performed one by one from the located third printing device 4C toward the upstream side.

As shown in FIG. 7, the control device 15 synchronizes the third plate cylinder 7C with the first transport speed V1 of the paper W from the state where the rotation angle of the third plate cylinder 7C of the third printing device 4C is 0 degree. Rotate with. The third printing apparatus 4C prints the reference point mark M1 on the paper W by the third plate 8C. At this time, the paper W is conveyed in a state where a predetermined tension is constantly applied. The printed rectangular reference point mark M1 moves to the detection position of the third reference point alignment sensor 10C at the first transfer speed V1. The third reference point alignment sensor 10C detects the side portion M1a on the downstream side of the reference point mark M1. When the control device 15 acquires the detection signal of the side portion M1a on the downstream side of the reference point mark M1 from the third reference point alignment sensor 10C, the control device 15 sets the transfer speed of the paper W by the feed roller 3 and the pull roller 12 to the first transfer speed. Switch to the second transport speed V2, which is extremely slower than V1. The second transport speed V2 is, for example, about 1 m / min.

The printed rectangular reference point mark M1 moves downstream at the second transport speed V2. The third reference point alignment sensor 10C detects the side portion M1b on the upstream side of the reference point mark M1. When the control device 15 acquires the detection signal of the side portion M1b on the upstream side of the reference point mark M1 from the third reference point alignment sensor 10C, the control device 15 stops the transfer of the paper W by the feed roller 3 and the pull roller 12.

From the time when the control device 15 starts rotating when the rotation angle of the third plate body 7C is 0 degrees, until the third reference point alignment sensor 10C detects the side portion M1b on the upstream side of the reference point mark M1. The transport amount S3 of the paper W transported between the two is calculated. The control device 15 has a radius D on the printed surface of the third plate 8C attached to the third plate cylinder 7C, a transport amount S3 of the paper W, and a sensor for aligning the third reference point from the axis P of the third plate cylinder 7C. Based on the sensor distance L3 up to 10C, the plate cylinder 7C rotates from the state where the rotation angle is 0 degrees until the third reference point alignment sensor 10C detects the side portion M1b on the upstream side of the reference point mark M1. The rotation angle of the plate cylinder 7C is calculated. As a result, the control device 15 calculates the circumferential position C3 of the plate reference point Y of the third plate 8C with respect to the plate cylinder reference point X of the third plate cylinder 7C. The circumferential position is the circumference of each plate cylinder from the plate cylinder reference point X of each plate cylinder to the plate reference point Y of each plate.

Similarly, the control device 15 detects the position in the circumferential direction of the plate reference point Y of the second plate 8B with respect to the plate cylinder reference point X of the second plate cylinder 7B in the second printing device 4B. The control device 15 conveys the paper W by the feed roller 3 and the pull roller 12 in a state where a predetermined tension is constantly applied. The control device 15 rotates the second plate cylinder 7B at a speed synchronized with the transport speed of the paper W from the state where the rotation angle of the second plate cylinder 7B in the second printing device 4B is 0 degrees. The second printing apparatus 4B prints the reference point mark M1 by the second plate 8B. The second printing device 4B is located on the upstream side of the third printing device 4C. Therefore, the reference point mark M1 printed by the second plate 8B does not overlap with the reference point mark M1 printed by the third plate 8C of the third printing apparatus 4C.

From the time when the control device 15 starts rotating when the rotation angle of the second plate body 7B is 0 degrees, until the second reference point alignment sensor 10B detects the side portion M1b on the upstream side of the reference point mark M1. The transport amount S2 of the paper W transported between the two is calculated. The control device 15 has a radius D on the printed surface of the second plate 8B attached to the second plate cylinder 7B, a transport amount S2 of the paper W, and a sensor for aligning the second reference point from the axis P of the second plate cylinder 7B. From the sensor distance L2 up to 10B, the circumferential position C2 of the plate reference point Y of the second plate 8B with respect to the plate cylinder reference point X of the second plate cylinder 7B is calculated.

Similarly, the control device 15 detects the position in the circumferential direction of the plate reference point Y of the first plate 8A with respect to the plate cylinder reference point X of the first plate cylinder in the first printing device 4A. The control device 15 conveys the paper W by the feed roller 3 and the pull roller 12 in a state where a predetermined tension is constantly applied. The control device 15 rotates the first plate cylinder 7A at a speed synchronized with the transport speed of the paper W from the state where the rotation angle of the first plate cylinder 7A in the first printing device 4A is 0 degrees. The first printing apparatus 4A prints the reference point mark M1 by the first plate 8A. The first printing device 4A is located on the upstream side of the third printing device 4C and the second printing device 4B. Therefore, the reference point mark M1 printed by the first plate 8A does not overlap with the reference point mark M1 printed by the third plate 8C of the third printing device 4C and the second plate 8B of the second printing device 4B.

The control device 15 is located on the upstream side of the reference point mark M1 in which the first reference point alignment sensor 10A moves at the first transfer speed V1 from the time when the rotation of the first plate cylinder 7A starts to rotate at a rotation angle of 0 degrees. The transport amount S1 of the paper W transported until the side portion M1b is detected is calculated. Further, the control device 15 aligns the transport amount S1 of the paper W, the radius D on the printed surface of the first plate 8A attached to the first plate cylinder 7A, and the first reference point from the axis P of the first plate cylinder 7A. From the sensor distance L1 to the sensor 10A, the circumferential position C1 of the plate reference point Y of the first plate 8A with respect to the plate cylinder reference point X of the first plate cylinder 7A is calculated.

As shown in FIGS. 4 and 8, in the plate position correction step S130, the control device 15 determines the circumferential position of the plate reference point Y of the third plate 8C with respect to the calculated plate cylinder reference point X of the third plate cylinder 7C. C3, the circumferential position C2 of the plate reference point Y of the second edition 8B with respect to the plate cylinder reference point X of the second edition cylinder 7B, and the plate reference point Y of the first edition 8A with respect to the plate cylinder reference point X of the first edition cylinder 7A. The other circumferential position is corrected with reference to the circumferential position of one of the circumferential positions C1. The control device 15 is, for example, the first with respect to the plate cylinder reference point X of the first plate cylinder 7A with reference to the circumferential position C2 of the plate reference point Y of the second plate 8B with respect to the plate cylinder reference point X of the second plate cylinder 7B. The circumferential position C1 of the plate reference point Y of the plate 8A is corrected to the circumferential position C1-circumferential position C2. Further, the control device 15 corrects the circumferential position C3 of the plate reference point Y of the third plate 8C with respect to the plate cylinder reference point X of the third plate cylinder 7C to the circumferential position C3-circumferential position C2.

In the rotary printing press 1 in which the reference points are aligned, the positions of the plates in the first printing device 4A, the second printing device 4B, and the third printing device 4C in the circumferential direction are the same. Therefore, the first plate 8A of the first printing device 4A, the second plate 8B of the second printing device 4B, and the third plate 8C of the third printing device 4C print the same position on the paper W.

Next, the registration of the rotary printing press 1 will be described with reference to FIGS. 1 and 2. The registration is a control for correcting the printing position of each plate attached to each plate cylinder of the first printing device 4A, the second printing device 4B, and the third printing device 4C. The first plate 8A attached to the first plate cylinder 7A of the first printing apparatus 4A has a register mark printing unit 8b for printing a register mark M2 for registration. The register mark printing unit 8b is located so as not to overlap with the reference point mark printing unit 8a when the first plate 8A is viewed in the circumferential direction.

As shown in FIGS. 1 and 2, in the registration, the control device 15 uses the registration mark M2 printed by the first plate 8A as the first registration sensor 11A, the second registration sensor 11B, and the third registration. It is detected by the sensor 11C. The control device 15 has a sensor distance L1 between the axis P of the first plate cylinder 7A and the first register sensor 11A, a sensor distance L2 between the axis P of the second plate cylinder 7B and the second register sensor 11B, and a second. The sensor distance L3 between the axis P of the 3rd plate cylinder 7C and the 3rd register sensor 11C, the distance P2 between the 1st printing device 4A and the 2nd printing device 4B, and the 2nd printing device 4B and the 3rd printing device 4C. From the interval P3, the relative positional relationship of the register mark M2 detected by the first registration sensor 11A, the second registration sensor 11B, and the third registration sensor 11C is calculated. The control device 15 is a first edition cylinder so that the relative positional relationship of the register mark M2 detected by the first registration sensor 11A, the second registration sensor 11B, and the third registration sensor 11C becomes appropriate. At least one of the rotation angle or rotation speed of 7A, the second plate cylinder 7B and the third plate cylinder 7C is controlled.

In the rotary printing press 1 configured as described above, in the first printing apparatus 4A, the radius D on the printing surface of the first plate 8A attached to the first plate cylinder 7A and the rotation angle of the first plate cylinder 7A are 0. The transport amount S1 of the paper W transported between the state of the degree and the detection of the upstream side portion M1b of the reference point mark M1 by the first reference point alignment sensor 10A, and the axis P of the first plate cylinder 7A. From the sensor distance L1 from the first reference point alignment sensor 10A to the first reference point alignment sensor 10A, the circumferential position C1 of the plate reference point Y of the first plate 8A with respect to the plate cylinder reference point X of the first plate cylinder 7A is calculated. Similarly, the rotary printing press 1 has a second plate with respect to the circumferential position C2 of the plate reference point Y of the second plate 8B with respect to the plate cylinder reference point X of the second plate cylinder 7B and the plate cylinder reference point X of the third plate cylinder 7C. The circumferential position C3 of the plate reference point Y of the 3rd plate 8C is calculated. That is, the rotary printing press 1 calculates the amount of misalignment of the plate on each plate cylinder in each printing device as an absolute value from the plate cylinder reference point X to the plate reference point Y. Therefore, the relative deviation of the plates between the plurality of printing devices is corrected based on the absolute value from the plate cylinder reference point X of each plate cylinder to the plate reference point Y of each plate. That is, the rotary printing press 1 suppresses the influence of the tension fluctuation of the paper W in correcting the relative positional deviation of the plates among the plurality of printing devices. Further, the rotary printing press 1 improves the detection accuracy of the transport amount of the paper W by switching the transport speed of the paper W to the extremely low second transport speed during the reference point alignment step S100. As a result, the accuracy of the reference point adjusting step S100 can be stabilized.

Further, the rotary printing press 1 causes tension in the paper W when printing the reference point mark M1 to suppress bending, twisting, etc. of the paper W, stabilizes the posture of the paper W, and pulls the paper W with the feed roller 3. By making the rotation speed the same as that of the roller 12, fluctuations in the tension of the paper W during transportation are suppressed. Therefore, the shape of the reference point mark printing portion 8a of each plate is appropriately printed on the paper W. Further, since the expansion and contraction of the paper W during transportation is suppressed, the reference point mark M1 printed on the paper W is transported to each reference point alignment sensor while maintaining the shape and dimensions at the time of printing. That is, the rotary printing press 1 suppresses the influence of the tension fluctuation of the paper W and the expansion and contraction of the paper W in correcting the relative positional deviation of each plate among the plurality of printing devices.

Further, in the rotary printing press 1, when each reference point alignment sensor detects the side portion M1a on the downstream side in the transport direction of the reference point mark M1, the transport speed of the paper W is reduced from the first transport speed V1 to the second transport speed V2. Let me. Therefore, the rotary printing press 1 can detect the side portion M1b on the upstream side of the reference point mark M1 in the transport direction with high accuracy by each reference point alignment sensor. That is, the rotary printing press 1 suppresses variations in the detection position of the side portion M1b on the upstream side in the transport direction of the reference point mark M1 by each reference point alignment sensor by reducing the transport speed of the paper W.

Further, in the rotary printing press 1, only one of the first printing device 4A, the second printing device 4B, and the third printing device 4C is in contact with the paper W during the reference point alignment step S100. That is, the rotary printing press 1 suppresses the influence of the tension fluctuation of the paper W in correcting the relative positional deviation of each plate between the first printing device 4A, the second printing device 4B, and the third printing device 4C. As a result, the accuracy of the reference point adjusting step S100 can be stabilized.

(Other embodiments)
In the above-described embodiment, the rotary printing press 1 is an intermittent rotary printing press that prints while intermittently conveying the paper W. However, the rotary printing press may be a rotary printing press that continuously conveys a base material. The rotary printing press 1 is a letterpress printing press. However, the rotary printing press may be an intaglio printing press. Further, the rotary printing machine may be an offset printing machine.

In the above-described embodiment, the rotary printing press 1 has a first printing device 4A, a second printing device 4B, and a third printing device 4C. However, the rotary printing press may have a plurality of printing devices. The rotary printing device may have, for example, two printing devices or four or more printing devices.

In the above-described embodiment, the rotary printing press 1 prints on the paper W which is the base material. However, the rotary printing press may be a film-shaped member made of resin, metal, or the like as a base material.

In the above-described embodiment, each printing device of the rotary printing press 1 has a reference point alignment sensor and a registration sensor, respectively. However, in each printing device, the reference point alignment sensor and the registration alignment sensor may be configured by a common sensor.

In each of the above-described embodiments, the rotary printing press 1 adjusts the printing position according to the rotation position or rotation speed of each plate cylinder of the first printing device 4A, the second printing device 4B, and the third printing device 4C. However, the rotary printing press may change the printing position by changing the transport distance with the compensator roll.

The above-described embodiment only shows a typical embodiment, and can be variously modified and implemented within a range that does not deviate from the gist of one embodiment. Further, of course, it can be carried out in various forms, and the scope of the present invention is indicated by the description of the scope of claims, and further, the equal meaning described in the scope of claims, and all within the scope. Including changes.

1 Rotating printing machine 2 Feeding roll support shaft 3 Feed roller 4A 1st printing device 4B 2nd printing device 4C 3rd printing device 5A, 5B, 5C Ink pot 6A, 6B, 6C Mounting roller 7A 1st plate cylinder 7B 2nd Plate cylinder 7C 3rd edition cylinder 8A 1st edition 8B 2nd edition 8C 3rd edition 9A, 9B, 9C impression cylinder 10A, 1st reference point alignment sensor 10B, 2nd reference point alignment sensor 10C, 3rd reference point Alignment sensor 11A, 1st registration alignment sensor 11B, 2nd registration alignment sensor 11C, 3rd registration alignment sensor 12 Pull roller 13 Winding roll support shaft 14 Guide roller 15 Control device

Claims (4)

A transport device for transporting a web-shaped base material, a plurality of printing devices having a plate cylinder for rotating a plate according to a transport speed of the base material, and printing on the base material by the plate, and the plurality of printings. A rotary printing press having a plurality of sensors for detecting a mark for a reference point printed on the substrate, and a control device capable of independently controlling the transport device and the plurality of printing devices. hand,
The plurality of printing devices are
A plate having a reference point mark printing portion, which is located side by side on the transport path of the base material at arbitrary intervals and prints a mark for the reference point, is said to have a reference point in the circumferential direction of each plate cylinder as a reference. Attached to the plate cylinder,
The plurality of sensors
Each printing apparatus is located on the downstream side of the substrate in the transport direction from the axis of the plate cylinder by a predetermined distance.
The control device is
The transport until the sensor detects the distance from the axis of the plate cylinder of the printing device to the sensor and the mark for the reference point printed on the base material by the plate attached to the plate cylinder. From the amount of the base material conveyed by the apparatus, the position of the plate in the circumferential direction with respect to the reference point in the circumferential direction of the plate cylinder is calculated for each printing apparatus.
Rotary press. In the rotary printing press according to claim 1.
The transport device is
It has a feed roller for feeding the base material from the paper feed roll, and a pulling roller for feeding the base material paid out by the feed roller into the take-up roll.
The control device is
In a state where a predetermined tension is generated in the base material, the rotation speed of the feed roller and the rotation speed of the tension roller are equalized to convey the base material, and the printing device marks the reference point on the base material. While printing on the base material, the transfer amount of the base material transported by the transfer device before the sensor detects the mark for the reference point is calculated.
Rotary press. In the rotary printing press according to claim 1 or 2.
The mark for the reference point is a rectangular shape whose sides are located in the transport direction of the base material.
The control device is
When the sensor detects a side portion of the rectangular mark for the reference point on the downstream side in the transport direction of the base material, the transfer speed of the base material by the transfer device is reduced, and the sensor has a rectangular shape. The plate with respect to the reference point in the circumferential direction of the plate cylinder based on the amount of the base material transported by the transport device until the upstream side portion of the base material in the transport direction is detected in the mark for the reference point. Calculate the position in the circumferential direction of
Rotary press. In the rotary printing press according to any one of claims 1 to 3.
The control device is
The position of the plate in the circumferential direction with respect to the reference point in the circumferential direction of the plate cylinder in the printing apparatus is calculated one by one in order from the printing apparatus on the downstream side.
Rotary press.

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