JP5463737B2 - Offset printing method and apparatus - Google Patents

Description

  The present invention relates to an offset printing method and apparatus used for performing fine printing on a printing object with high printing accuracy, as in the case of forming an electrode pattern on a substrate by printing.

  In recent years, as a method of forming an electrode pattern (conductive pattern) such as a liquid crystal display on a required substrate, a printing technique using a conductive paste as a printing ink instead of fine processing such as etching of a metal vapor deposition film, for example, A technique for printing and forming an electrode pattern on a substrate using an intaglio offset printing technique has been proposed (see, for example, Patent Document 1 and Patent Document 2).

  When a fine print pattern such as the electrode pattern is offset printed on a print target (work) such as the substrate, high printing accuracy is required. For this reason, as an offset printing apparatus when performing offset printing with high printing accuracy, it is advantageous to use a flat plate printing apparatus of a type that uses a flat plate similar to a printing target as a plate.

  Offset printing, in which printing is performed on a flat plate-like printing object such as a substrate using this type of flat plate, is performed by bringing a rolling blanket roll into contact with the previously inked plate from above. The ink is once transferred (received) to the blanket roll, and then the blanket roll is brought into contact with the printing object from above, and the ink is retransferred (printed) from the blanket roll to the printing object. Printing that reproduces the printing pattern of the intaglio is performed on the surface of the object.

  By the way, transfer from the plate to the blanket roll (acceptance) and retransfer (printing) from the blanket roll to the printing object provide high-precision reproducibility in printing the printing pattern of the plate onto the printing object. For this purpose, control is performed to synchronize the relative movement speed between the blanket roll and the plate or printing object and the peripheral speed of the blanket roll, and at the same time, contact timing and contact between the blanket roll and the plate or workpiece. It is necessary to control the height of the blanket roll to adjust the pressure.

  Conventionally, as a method of controlling the height of the blanket roll for adjusting the contact timing and pressure between the blanket roll and the plate or the printing object as described above, the blanket roll (roller transfer cylinder) is a plate (master plate). And the bearer roll provided at the end of the blanket roll, when translated relative to the printing object (work board), to the bearer rail provided on the printing press main body on which the plate and the printing object are placed. In addition, the height of the bearer rail is set to be low at a position where the blanket roll is brought into contact with a plate or a printing target, while at a place where the blanket roll is not desired to be brought into contact with the printing plate or the printing target. By setting it higher, the blanket roll rotation control and the blanket roll height control (pressure adjustment) can be performed simultaneously. Technique of so there has recently been proposed (e.g., see Patent Document 3).

  Various methods have been conventionally proposed as a method for controlling the movement speed of the plate and the printing target in offset printing and the peripheral speed accompanying the rotation of the blanket roll (for example, Patent Document 4). , See Patent Document 5).

Japanese Patent No. 2797567 Japanese Patent No. 3904433 JP 2006-142664 A Japanese Unexamined Patent Publication No. 9-70948 JP 2000-272079 A

  However, in the method disclosed in Patent Document 3, the rotation timing of the blanket roll and the height control of the blanket roll are simultaneously performed, so that the contact timing and the contact pressure between the blanket roll and the plate or workpiece can be controlled. Although it can be adjusted, when offset printing is performed using plates and printing objects of different sizes, the bearer rail installed on the main body of the printing machine must be replaced. In addition, there is a problem that the cost increases.

  In addition, although the idea which synchronizes the moving speed of a plate or a printing object and the peripheral speed of a blanket roll is shown by the said patent document 4 and the patent document 5, contact with the said blanket roll and a plate or printing object is shown. The idea of controlling timing and contact pressure is not shown in particular.

  Therefore, the present invention can improve the printing accuracy by appropriately controlling the contact timing and the contact pressure when the rolling blanket roll is brought into contact with the plate or the printing object. Therefore, an object of the present invention is to provide an offset printing method and apparatus that can easily cope with the case of using plates and printing objects of different sizes.

In order to solve the above-mentioned problems, the present invention corresponds to claim 1, wherein a rotating blanket roll is brought into contact with a plate held by a plate table running on a guide rail on a gantry, and then the blanket The roll is brought into contact with the printing object held on the printing object table running on the guide rail, so that the transfer from the plate to the blanket roll and the retransfer from the blanket roll to the printing object are performed. In the offset printing method, the blank on the front end side in the moving direction from the printing pattern forming area in the plate is blanket in a state where the peripheral speed of the rotating blanket roll is synchronized with the moving speed of the plate accompanying the travel of the plate table. before reach the position directly below the rolls, it is lowered to synchronize the descending speed of the blanket roll and the plate moving speed Above the moving direction tip end side of the margin of the plate, the blanket roll, since in contact at a peripheral speed synchronized with the speed of movement of the plate, the blanket roll so as to contact with the print-patterned region of the plate, then, the circumferential speed of the blanket roll to the rotation, in a state of being synchronized with the moving speed of the print target with the traveling of the printing object table, move Dokata direction tip end portion of the printing medium is directly below the position of the blanket roll until the reach, is lowered in synchronization with the moving speed of the print target lowering speed of the blanket roll, the upper side of the printed, the moving direction tip end side than the print pattern forming regions of the plate in the blanket roll After contacting the part that is in contact with the margin, the part of the blanket roll that is in contact with the printing pattern forming area of the plate is An offset printing method so as to contact with the printed.

  In the above configuration, the contact pressure or roll height position of the blanket roll is controlled to a predetermined value while the blanket roll is in contact with the margin on the front side in the moving direction with respect to the printing pattern forming region in the plate, A blanket roll that maintains a controlled contact pressure or roll height position is brought into contact with the printing pattern forming area of the plate, and the blanket roll has a margin on the front side in the moving direction from the printing pattern forming area of the plate. The contact pressure or roll height position of the blanket roll is controlled to a predetermined value while the part in contact with the printing object is in contact with the object to be printed, and the controlled contact pressure or roll height position is maintained. The portion of the blanket roll that is in contact with the printing pattern forming area of the plate is brought into contact with the printing object. To.

Further, according to claim 3, a plate table and a printing target table that run on a guide rail provided on a gantry are provided, the plate held on the plate table, and the printing target held on the printing target table. In the offset printing apparatus in which the blanket roll is sequentially brought into contact with each other to perform transfer from the plate to the blanket roll and retransfer from the blanket roll to the printing object, the drive motor for rotating the blanket roll And a control device that gives commands to the lifting actuator and the driving device of each table, and the control device synchronizes the peripheral speed of the rotating blanket roll and the movement speed of the plate accompanying the travel of the plate table, The margin on the front side in the moving direction from the printing pattern formation area in the plate is the position directly below the blanket roll Before reach, the lowering speed of the blanket roll is lowered in synchronization with the plate of the moving speed, contact touch causes function blanket roll to the rotation on the upper side of the moving direction tip end side of the margin of said plate, and said a function for synchronizing the moving speed of the print target with the traveling of the circumferential speed printed table of the blanket roll which rotates, by transfer Dokata direction tip end portion of the printing medium is reach the position directly below the above blanket roll, the A portion where the lowering speed of the blanket roll is lowered in synchronization with the moving speed of the printing object , and the blanket roll is brought into contact with the blank on the top side of the printing pattern forming area of the plate on the upper side of the printing object. an offset printing apparatus having the configuration as formed by a function which makes touching contact with.

  Furthermore, in the above configuration, the control device determines the contact pressure or roll height position between the blanket roll and the plate while the blanket roll is in contact with the margin on the front side in the moving direction with respect to the printing pattern forming area in the plate. And the contact between the blanket roll and the printing target while the portion of the blanket roll that is in contact with the margin on the leading end side in the moving direction from the printing pattern forming area of the plate is in contact with the printing target. The pressure or roll height position is controlled to a predetermined value.

According to the present invention, the following excellent effects are exhibited.
(1) A rotating blanket roll was brought into contact with a plate held on a plate table running on a guide rail on a gantry, and then the blanket roll was held on a printing target table running on the guide rail. In the offset printing method in which the transfer from the plate to the blanket roll and the retransfer from the blanket roll to the print target are performed by contacting the printing target, the peripheral speed of the rotating blanket roll, and the plate table in a state of being synchronized with the movement speed of the plate caused by the travel of the up margin of the moving direction tip end side than the print pattern forming region of the plate to reach the position directly below the blanket roll, the descending speed of the blanket roll It is lowered in synchronization with the plate of the moving speed, to the upper side of the moving direction tip end side of the margin of the plate, the Buranke' Roll, from contacting at a peripheral speed synchronized with the speed of movement of the plate, the blanket roll so as to contact with the print-patterned area of the plate, then the peripheral speed of the blanket roll to the rotary printing target in a state of being synchronized with the moving speed of the print target with the traveling of the table, until the transfer Dokata direction tip end portion of the printing medium is reach the position directly below the above blanket roll, printed lowering speed of the blanket roll The blanket is moved downward in synchronism with the moving speed of the printing plate, and the blanket roll is brought into contact with a portion of the blanket roll that is in contact with the margin on the leading end side in the moving direction with respect to the printing pattern forming area of the plate. Offset printing method for bringing a portion of a roll in contact with a printing pattern forming region of the plate into contact with the printing object And a control device for giving commands to the drive motor for the blanket roll, the actuator for raising and lowering, and the drive device for each table, and the control device is associated with the peripheral speed of the rotating blanket roll and the travel of the plate table. a function for synchronizing the moving speed of the plate, until the margin of the print pattern forming region moves forward end side than in the plate to reach the position directly below the blanket roll, the descending speed of the blanket roll plate moving speed and synchronization is lowered by the function of causing come in contact with the blanket roll to the aforementioned rotation in the upper moving direction tip end side of the margin of said plate, and, to be printed with the traveling of the circumferential speed printed table of the blanket roll to the rotating a function to synchronize the moving speed, move Dokata direction front end of the print target to reach the position directly below the blanket roll The blanket roll descending speed is lowered in synchronization with the moving speed of the printing object, and the blank on the front side in the moving direction from the printing pattern forming area of the plate on the blanket roll is placed above the printing object. since the offset printing apparatus having the configuration as formed by a function which makes touching contact with the contacted portion, when performing the transfer from the plate on the plate table to blanket roll (acceptance), said blanket roll The blanket roll can be brought into contact with the upper surface of the plate in a state where the relative speed difference between the peripheral speed of the plate and the moving speed of the plate accompanying the travel of the plate table is reduced. It is possible to prevent damage and damage of the blanket roll by contacting the step between the plate table and the outer periphery of the plate. Kill. Similarly, when performing retransfer (printing) from the blanket roll to the printing target on the printing target table, the relative speed between the peripheral speed of the blanket roll and the moving speed of the printing target accompanying the travel of the printing target table. Since the blanket roll can be brought into contact with the upper surface of the printing object in a state where the difference is reduced, the blanket roll is damaged due to friction with the printing object, or the outer periphery of the printing object table and the printing object. It is possible to prevent the possibility of damage due to contact with the step. Therefore, it is possible to prevent a decrease in printing accuracy due to damage to the blanket roll.
(2) Moreover, it is possible to easily cope with plates of different sizes and printing objects by appropriately changing the parameters in the control device without changing the device configuration.
(3) The contact pressure or roll height position of the blanket roll is controlled to a predetermined value while the blanket roll is in contact with the margin on the front side in the moving direction with respect to the printing pattern forming region in the plate, and the controlled The blanket roll that maintains the contact pressure or roll height position is brought into contact with the printing pattern formation area of the plate, and further, the blanket roll is brought into contact with the blank on the front side in the moving direction from the printing pattern formation area of the plate. The blanket roll is controlled in such a manner that the contact pressure or roll height position of the blanket roll is controlled to a predetermined value while the portion is in contact with the object to be printed, and the controlled contact pressure or roll height position is maintained. By bringing the portion of the roll in contact with the printing pattern forming area of the plate into contact with the printing object Since the contact pressure or roll height position can be kept constant while the blanket roll is in contact with the printing pattern forming area of the plate, the reproducibility of the printing pattern transferred (accepted) from the plate to the blanket roll is improved. be able to. Furthermore, since the contact pressure or the roll height position can be kept constant while the portion of the blanket roll that is in contact with the printing pattern forming area of the plate is in contact with the printing object, printing is performed from the blanket roll. It is possible to improve the reproducibility of a print pattern that is retransferred (printed) to an object. Therefore, the printing accuracy of offset printing can be made higher.

It is a schematic side view which shows one Embodiment of the offset printing method and apparatus of this invention. It is a side view which expands and shows the transfer mechanism part in the offset printing apparatus of FIG. It is an AA direction arrow line view of FIG. It is a BB direction arrow line view of FIG. It is a schematic diagram which shows the control structure of the control apparatus with which the offset printing apparatus of FIG. 1 is equipped. FIG. 2 is a time chart when offset printing is performed by the offset printing apparatus of FIG. 1, (A) is a change in the roll height position of the blanket roll, and (B) is a time when the blanket roll is brought into contact with a plate or a printing target. (A) shows a change in the roll rotation angle of the blanket roll, and (d) shows a change in the table position of the plate table or the printing target table. . It is a schematic diagram which shows the state of a blanket roll and a plate table in the time of T0 of FIG. It is a schematic diagram which shows the state of the blanket roll and plate table in the time of T1 of FIG. It is a schematic diagram which shows the state of the blanket roll and plate table in the time of T2 of FIG. It is a schematic diagram which shows the state of the blanket roll and plate table in the time of T3 of FIG. It is a schematic diagram which shows the state of a blanket roll and a plate table in the time of T4 of FIG. It is a schematic diagram which shows the state of a blanket roll and a plate table in the time of T5 of FIG. It is a schematic diagram which shows the state of a blanket roll and a plate table in the time of T6 of FIG. It is a schematic diagram which shows the state of a blanket roll and a plate table in the time of T7 of FIG. It is a schematic diagram which shows the state of a blanket roll and a plate table in the time of T8 of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  1 to 15 show an embodiment of an offset printing method and apparatus according to the present invention, which is as follows.

  That is, a guide rail 2 extending in one direction, for example, a set of two guide rails 2 is provided on the upper side of the horizontal base 1, and a required plate 3 such as an intaglio is attached to the upper surface of the guide rail 2. In a state where the plate table 4 to be held and the print target table 6 to which the print target 5 such as a substrate is attached and held on the upper surface are arranged in order from one end side in the longitudinal direction of the guide rail 2 (left side in FIG. 1). Each is slidably attached via an individual guide block 2a.

  Further, the plate table 4 and the printing object table 6 can be independently reciprocated (traveled) along the guide rail 2 by an individual table driving device 7 such as a linear motor, The plate table 4 and the printing target table along the longitudinal direction of the guide rail 2 with a reference position (origin) as a required position in the longitudinal direction of the guide rail 2 by a common linear scale 8 provided in parallel with the guide rail 2 6 absolute positions can be detected.

  A rotation drive motor is arranged at a position corresponding to the longitudinal intermediate portion of the guide rail 2 on the gantry 1 so as to extend in a direction perpendicular to the longitudinal direction of the guide rail 2 above the guide rail 2. 11, a blanket roll 10 that can be rotationally driven by the motor 11, an encoder 12 for detecting the rotation angle (circumferential angular posture) of the blanket roll 10, an elevator actuator 13 for raising and lowering the blanket roll 10, A height sensor 14 for detecting the height position of the blanket roll 10 that is lifted and lowered by the lifting actuator 13, and a plate 3 and a printing target table that hold the blanket roll 10 on the plate table 4 as will be described later. 6 is a contact pressure when contacting the printing object 5 held on 6 so as to be pressed from above. The transfer mechanism 9 comprising a pressure sensor 15 for detecting provided.

  Further, detection signals for the position of the plate table 4 and the printing target table 6 in the longitudinal direction of the guide rail 2 input from the linear scale 8, and the encoder 12, height sensor 14, and pressure sensor of the transfer mechanism 9. 15, based on a signal input from 15, commands are given to the individual driving devices 7 for the plate table 4 and the printing target table 6, and the rotation driving motor 11 and the lifting actuator 13 for the blanket roll 10 of the transfer mechanism 9. The offset printing apparatus of the present invention is configured with a control device (controller) 16 that provides the above.

  More specifically, as shown in FIGS. 1 to 4, the transfer mechanism section 9 includes two transfer mechanism sections 9 spaced apart from each other in the longitudinal direction of the guide rail 2 on both outer sides of the intermediate section in the longitudinal direction of the guide rail 2. A gate-shaped member comprising a column member 18 having a required height dimension and a beam member 19 arranged so as to cross over the required dimension of the guide rail 2 and connecting the tops of the column members 18 to each other. A frame 17 is provided, and the rotary shafts 20 at both ends of the blanket roll 10 are provided with bearings 22 between the two support members 18 arranged in the longitudinal direction of the guide rail 2 on the outside of the guide rail 2 in the frame 17. Both end portions of a roll support frame 21 that is rotatably held via a linear guide 23 extending in the vertical direction are attached so as to be movable in the vertical direction.

  Further, at the portion of the beam member 19 of the frame 17 that is directly above both ends of the roll support frame 21, as a lifting actuator 13, for example, a required dimension extends in the vertical direction and a portion closer to the upper end of the frame 17. A screw shaft 24 rotatably supported on the beam member 19 via a bearing 25; and an elevating drive motor 26 connected to an upper end portion of the screw shaft 24 protruding upward from the bearing 25 via a gear box 27. Each of the ball screw mechanisms 13 is provided with a ball screw mechanism 13 (for the sake of convenience, the same reference numeral as that of the elevating actuator 13) formed of a nut member 28 screwed into the lower portion of the screw shaft 24. Each of the nut members 28 is attached to a required attachment member 29 attached to the upper side of both ends of the roll support frame 21 as the pressure sensor 15. For example if, the screw shaft 24 to loosely fitted a ring-shaped load cell 15 was (for convenience, the pressure sensor 15 designated by the common reference numerals and) is as configuration linked while interposing respectively. Thus, each load cell is integrated with each nut member 28 by driving each lifting drive motor 26 of each ball screw mechanism 13 and rotating each screw shaft 24 via each gear box 27. The blanket roll 10 can be moved up and down via 15, the attachment member 29 and the roll support frame 21.

  In addition, as shown in FIG. 7, the raising / lowering range of the said blanket roll 10 by the driving | operation of each raising / lowering drive motor 26 of each said ball screw mechanism 13 is this blanket roll 10, and the lower end part of the outer peripheral surface is the said mount frame. The evacuation height at which the plate 3 held on the plate table 4 traveling along the guide rail 2 on 1 and the upper surface of the printing target 5 held on the printing target table 6 are separated from each other above the required dimension. From the position Ha, the lower end portion of the outer peripheral surface of the blanket roll 10 is in contact with the height position of the upper surface of the plate 3 held on the plate table 4 and the printing target 5 held on the printing target table 6. It is assumed that it is set in a range that can be lowered to a pressing height position Hc that is slightly below the height position Hb.

  Further, in the state where the printing plate 5 held on the printing plate table 4 or the printing object 5 held on the printing object table 6 is arranged below the blanket roll 10, each ball screw mechanism 13 is operated as described above. Is driven to lower the blanket roll 10 from the retreat height position Ha to the contact height position Hb, so that the plate 3 on the plate table 4 or the print target 5 on the print target table 6 is moved. When pressing from above with the required contact pressure against the plate 3 or the printing object 5 in a state where the blanket roll 10 is urged downward by further lowering to the pressing height position Hc after contacting from above. The reaction force of the contact pressure acting on the blanket roll 10 from the plate 3 or the printing object 5 can be detected by the load cells 15.

  Further, as shown in FIG. 3, for example, an encoder 14 (e.g., an encoder 14 (not shown) that is provided with a height sensor 14 for measuring the height of the blanket roll 10 is individually attached to each elevating drive motor 26 of each ball screw mechanism 13. For convenience, the same reference numerals as those of the height sensor 14 are attached). Accordingly, the rotation amount of each screw shaft 24 via each gear box 27 calculated based on the signal of the rotation amount of each lifting drive motor 26 detected by each encoder 14, and each screw shaft Based on the 24 leads, the height position of the blanket roll 10 that moves up and down integrally with the nut members 28 screwed onto the screw shafts 24 can be indirectly detected.

  A reduction gear 30 connected to the rotation drive motor 11 is attached to one end side of the roll support frame 21, and the roll support frame 21 is rotatably held on an output shaft (not shown) of the reduction gear 30. One rotating shaft 20 of one blanket roll 10 (the left rotating shaft 20 in FIG. 3) is connected. Further, the encoder 12 is attached to the rotation drive motor 11. Thus, the blanket roll 10 can be rotationally driven through the speed reducer 30 by the operation of the rotational drive motor 11, and at this time, the rotation of the rotational drive motor 11 detected by the encoder 12. Based on the quantity signal, the rotation angle of the blanket roll 10 rotated via the speed reducer 30 (rotation angle with respect to a certain position in the circumferential direction) can be measured.

  As shown in FIG. 5, the control device 16 includes the encoders 14 as height sensors attached to the ball screw mechanisms 13 provided corresponding to both ends of the blanket roll 10, and When the detection signal S1 of the roll height current value and the detection signal S2 of the roll contact pressure current value are input from the load cells 15 as the pressure sensors, the ball screws are based on the signals S1 and S2. A raising / lowering drive command C1 is given to the raising / lowering drive motor 26 of the mechanism 13, and a pair of roll height controllers 16a having a function of individually controlling the height positions of both ends of the blanket roll 10 are provided. Based on the detection signal S3 of the current value of the roll rotation angle of the blanket roll 10 input from the encoder 12 attached to the drive motor 11, The rotation drive motor 11 gives a rotational drive command C2 comprises a roll rotation controller 16b has a function capable of controlling the rotation angle and the peripheral speed of the blanket roll 10.

  Further, the control device 16 is driven to the drive device 7 (see FIG. 3) of the plate table 4 based on the detection signal S4 of the plate table 4 position current value input from the linear scale 8 provided on the gantry 1. From the linear scale 8, a plate table control unit 16 c having a function capable of giving a command C 3 and controlling the position of the plate table 4 and the moving direction (traveling direction) and moving speed (traveling speed) due to the time change of the position. Based on the input print target table 6 position current value detection signal S5, a drive command C4 is given to the drive device 7 of the print target table 6 (see FIG. 3), and the position of the print target table 6 and the position A printing target table control unit 16d having a function of controlling a moving direction (traveling direction) and a moving speed (traveling speed) due to time change, and each of the table control units 16c and 16d, Respectively is a structure in which to be able to each roll height control unit 16a and the synchronous control roll rotation controller 16b.

  In FIG. 5, for convenience of illustration, the description of the frame 17, the roll support frame 21, and the speed reducer 30 of the transfer mechanism unit 9 is omitted, and each ball screw mechanism 13 and each ball screw mechanism 13 are provided. The shape, arrangement, and mounting structure of the encoder 14, each load cell 15, the blanket roll 10, and the rotation drive motor 11 and encoder 12 attached to the blanket roll 10 are shown in a simplified manner.

  In addition, the offset printing apparatus of the present invention requires one end of the guide rail 2 in the longitudinal direction at a position corresponding to the longitudinal end of the guide rail 2 on the gantry 1 as shown in FIG. A plate table standby area 31 on which the plate table 4 can be exchanged by moving the plate table 4 to the plate unit and allowing the plate 3 held on the plate table 4 to be exchanged. An inking device 32 for inking the plate 3 held on the plate table 4 is provided between 31 and the transfer mechanism section 9. Further, the print target table 6 is moved to the other end in the longitudinal direction of the guide rail 2 at a position corresponding to the other end in the longitudinal direction of the guide rail 2 on the gantry 1, and the print target is stored. The table 6 includes a print target installation area 33 for attaching a new print target 5 and removing the print target 5 after printing.

  The plate 3 is provided with a margin 3b having a required width around a print pattern forming region 3a that is an effective range of the plate.

  Here, the offset printing method of the present invention will be described in detail with reference to FIGS. 6 (a), (b), (c), (d) to FIG. . 6A, 6B, 6C, and 6D show the roll height position of the blanket roll 10, the control target value of the contact pressure of the blanket roll 10 with respect to the plate 3 and the printing object 5, and the blanket roll 10. 6 is a time chart showing changes in the rotation angle and the table positions of the plate table 4 and the printing target table 6. FIGS. 7 to 15 show the blanket roll 10 at the time T0, T1, T2, T3, T4, T5, T6, T7, and T8 in FIGS. 6 (A), 6 (B), 6 (D). FIG. 16 is a schematic diagram showing the state of the plate table 4 holding the plate 3, and in FIGS. 7 to 15, the rotation direction of the blanket roll 10 at the time of the transfer process is a clockwise direction in the drawing, and at the time of the transfer process The travel direction of the plate table 4 is assumed to be a direction from the other end in the longitudinal direction of the guide rail 2 toward one end (leftward in the figure).

  That is, when performing offset printing using the offset printing apparatus of the present invention having the above-described configuration, the plate 3 previously held on the plate table 4 in the plate table standby area 31 is run on the plate table 4. The plate table 4 holding the inked plate 3 is raised to the retreat height position Ha by the ball screw mechanisms 13 in the transfer mechanism unit 9. 7 is passed through the blanket roll 10 in a state where it is in a state of being in advance, and is set in advance to a position closer to the other dimension in the longitudinal direction of the guide rail 2 than the position directly below the blanket roll 10 as shown in FIG. It is arranged at the initial position Xa for use.

  The print target table 6 holds a print target 5 to be newly printed in the print target installation area 33.

  In this state, as shown in FIGS. 6 (d) and 7, the control device 16 uses the function of the plate table control unit 16c (see FIG. 5) at the time T0 to transfer the transfer processing initial position Xa. The plate table 4 arranged in the above is started to travel toward a position directly below the blanket roll 10 so as to reach a certain traveling speed.

  Next, as shown in FIGS. 6 (c) and 8, the control device 16 uses the function of the roll rotation control unit 16b (see FIG. 5) at the time T1 to blanket the roll 10 of the transfer mechanism unit 9. Start rotating. At this time, the control device 16 controls the circumferential speed of the rotating blanket roll 10 and the plate table 4 as the plate table 4 travels by the synchronous control of the plate table control unit 16c and the roll rotation control unit 16b. The movement speed of the plate 3 held by the plate table 4 is synchronized, and the edge of the plate 3 that moves as the plate table 4 travels is located at the position immediately below the blanket roll 10. When reaching, the phase of the rotating blanket roll 10 is controlled so that the blanket roll 10 has a predetermined rotation angle.

  Next, as shown in FIGS. 6A and 9, the control device 16 is arranged at the retracted height position Ha by the function of each roll height control unit 16a (see FIG. 5) at time T2. The blanket roll 10 that has been rotated in the above state starts to descend. At this time, the control device 16 controls the descending speed of the rotating blanket roll 10 and the traveling speed of the plate table 4 by synchronous control of the roll height control unit 16a and the plate table control unit 16c. When the plate table 4 is synchronized, the margin 3b provided at the end edge of the plate 3 held on the front end side in the moving direction reaches the position directly below the blanket roll 10. FIG. When traveling to the roll contact position Xb shown in (d), as shown in FIG. 6 (a), the blanket roll 10 can be lowered to the contact height position Hb.

  As described above, as shown in FIGS. 6 (A), 6 (D), and FIG. 10, at the time T3, the plate table 4 reaches the roll contact position Xb, and at the same time, the blanket roll 10 in the rotated state has a contact height. Since the plate 3 is lowered to the position Hb, the blanket roll 10 is moved along the travel of the plate table 4 on the upper side of the margin 3b of the edge portion on the front end side in the moving direction of the plate 3 held on the plate table 4. It can come into contact at a peripheral speed synchronized with the moving speed of the.

  As described above, when the blanket roll 10 comes into contact with the margin 3b at the edge on the leading end side in the moving direction of the plate 3 at the time T3, the control device 16 causes each load cell 15 to set the height of each roll. Based on the detection signal S2 of the roll contact pressure current value for the plate 3 of the blanket roll 10 inputted to the control unit 16a, the roll contact pressure current value matches the pressure target value as shown in FIG. Thus, pressure control for issuing an elevation drive command C1 (see FIG. 5) from each roll height controller 16a to each ball screw mechanism 13 is started.

  At this time, the control device 16 sets the contact pressure target value shown in FIG. 6B in advance as follows in performing the pressure control.

  That is, as shown in FIGS. 6 (d) and 11, the traveling plate table 4 has a front end in the moving direction of the printing pattern forming area 3a of the plate 3 held on the plate table 4 as described above. The time to advance to the transfer start position Xc that is arranged to reach the position immediately below is T4, and then the plate table 4 is held on the plate table 4 as shown in FIGS. The time when the rear end portion in the movement direction of the print pattern formation region 3a advances to the transfer end position Xd where it reaches the position directly below the blanket roll 10 is T5. Further, the plate table 4 is shown in FIG. ) And FIG. 13, the roll is arranged such that the margin 3 b at the end edge on the rear end side in the moving direction of the plate 3 held on the plate table 4 reaches a position directly below the blanket roll 10. With the time to advance to the opposite position Xe as T6, the contact pressure target value shown in FIG. 6 (b) is gradually increased to the predetermined pressure P between the time T3 and immediately before time T4, and the time T4 is increased. The predetermined pressure P is maintained from immediately before to immediately after time T5, and is set so that the contact pressure gradually decreases to zero between the time immediately after time T5 and the time T6.

  Therefore, as shown in FIG. 10, at the time T3, the pressure control by the control device 16 is performed with the blanket roll 10 in contact with the margin 3b at the edge on the front end side in the moving direction of the plate 3. When started, the blanket roll 10 is further lowered toward the pressing height position Hc (see FIG. 11) by the ball screw mechanisms 13 to which the elevation drive command C1 is given from the roll height control units 16a. The blanket roll 10 is gradually pressed against the margin 3b of the edge portion on the front end side in the moving direction of the plate 3 on the plate table 4 by being biased downward so that the contact pressure is increased. Is increased to the predetermined pressure P.

  Thereafter, as shown in FIGS. 6 (d) and 11, the plate table 4 travels to the transfer start position Xc at time T4, and the printing pattern formation area of the plate 3 held on the plate table 4 is reached. When the leading end of the moving direction of 3a reaches a position immediately below the blanket roll 10, the blanket roll 10 comes into contact with the printing pattern forming region 3a of the plate 3 with the contact pressure held at the predetermined pressure P. After that, as shown in FIGS. 6 (d) and 12, the plate table 4 travels to the transfer end position Xc at time T5, and the printing pattern of the plate 3 held on the plate table 4 is obtained. The rotating blanket roll 10 is placed in the print pattern forming area 3a of the plate 3 until the rear end in the moving direction of the forming area 3a reaches a position directly below the blanket roll 10. A contact pressure which is held in a force P, and since it comes into contact at a peripheral speed synchronized with the speed of movement of the plate 3, the transfer of the blanket roll 10 from the plate 3 is performed.

  After the rear end portion in the moving direction of the printing pattern forming area 3a of the plate 3 on the plate table 4 that has traveled to the transfer end position Xc at the time T5 as described above passes the position immediately below the blanket roll 10. The blanket roll 10 is gradually lifted from the pressing height position Hc by the ball screw mechanism 13 to which the elevation drive command C1 is given from the roll height control unit 16a of the control device 16. As shown in FIG. 6 (D) and FIG. 13, the contact pressure with respect to the margin 3b of the edge portion on the rear end side in the moving direction of the plate 3 on the plate table 4 of the blanket roll 10 is gradually reduced. At time T6, the blank 3b on the edge 3 on the rear end side in the moving direction of the plate 3 on the plate table 4 that has advanced to the roll separation position Xe is the blanket roll. In a state where just below is disposed at a position of 0, that the blanket roll 10 is lifted beyond the contact height position Hb, the blanket roll 10 is brought into away from the upper surface of the plate 3.

  Thereafter, the control device 16 continues to pull up the blanket roll 10 by the function of each roll height control unit 16a (see FIG. 5), and as shown in FIGS. When the blanket roll 10 is pulled up to the retreat height position Ha at the time T7, the lifting operation is finished, and then the plate is moved at the time T8 as shown in FIGS. The travel of the plate table 4 is stopped by the function of the table control unit 16c (see FIG. 5), and the blanket roll 10 is appropriately rotated by the function of the roll rotation control unit 16b (see FIG. 5). ) Return to the initial state for processing.

  After the transfer from the plate 3 on the plate table 4 to the blanket roll 10 is completed as described above, the roll height control unit 16a, the roll rotation control unit 16b, and the print target table control unit 16d in the control device 16 are used. The printing table 6 and the printing object 5 held on the printing table 6 are subjected to the processes shown in FIGS. The blanket roll 10 performs retransfer (printing) on the print object 5 by performing the same timing as that described above.

  Thus, according to the offset printing method and apparatus of the present invention, when transferring (accepting) from the plate 3 on the plate table 4 to the blanket roll 10, the peripheral speed of the blanket roll 10 and the plate table 4 are adjusted. The blanket roll 10 is reliably brought into contact with the upper surface of the margin 3b at the front end side in the moving direction of the plate 3 in a state where the moving speed of the plate 3 accompanying the traveling is synchronized, that is, in a state where the relative speed difference is very small. Therefore, it is possible to suppress damage to the blanket roll 10 due to friction with the plate 3 and to prevent the blanket roll 10 from coming into contact with the step between the plate table 4 and the outer periphery of the plate 3 and damaging it. can do.

  Further, the blanket roll 10 increases the contact pressure to a predetermined pressure P while it is in contact with the margin 3b on the leading end side in the moving direction of the plate 3, and then contacts the printing pattern forming region 3a of the plate 3, In addition, since the contact pressure can be kept constant while in contact with the print pattern forming region 3a, the reproducibility of the print pattern transferred from the plate 3 to the blanket roll 10 can be improved.

  Similarly, when performing retransfer (printing) from the blanket roll 10 to the print target 5 on the print target table 6, the peripheral speed of the blanket roll 10 and the movement of the print target 5 accompanying the travel of the print target table 6. Since the blanket roll 10 can be reliably brought into contact with the upper surface of the printing object 5 in a state where the speed is synchronized, that is, in a state where the relative speed difference is very small, the blanket roll due to friction with the printing object 5 10 can be prevented, and the blanket roll 10 can be prevented from being damaged due to contact with the step between the printing object table 6 and the outer periphery of the printing object 5.

  Further, the blanket roll 10 increases the contact pressure to a predetermined pressure P while the portion of the plate 3 that has been in contact with the margin 3b on the front side in the moving direction is in contact with the printing object 5, and then the blanket roll 10 The portion of the plate 3 that is in contact with the printing pattern forming region 3a can be brought into contact with the printing object 5 while maintaining a constant contact pressure, so that the re-transfer from the blanket roll 10 to the printing object 5 is possible. The reproducibility of the printed pattern can be improved.

  As described above, according to the offset printing method and apparatus of the present invention, the printing accuracy of offset printing can be made high.

  Moreover, in the control device 16, the contact height position Hb and the pressing height position Hc of the blanket roll 10 shown in FIG. 6 (a), and the roll of each table position shown in FIG. 6 (d). By appropriately changing parameters such as the contact position Xb, the transfer start position Xc, the transfer end position Xd, and the roll separation position Xe, it is possible to easily cope with the plate 3 and the print target 5 having different sizes.

  Note that the present invention is not limited to the above-described embodiment, and is described as performing constant pressure control when the blanket roll 10 is brought into contact with the plate 3 or the printing object 5. The height position Hc is set to a predetermined height position in advance, and while the blanket roll 10 is in contact with the printing pattern forming region 3a of the plate 3, and the printing pattern formation of the plate 3 on the blanket roll 10 is performed. While the portion in contact with the region 3a is in contact with the printing target 5, the height control of holding the height position of the blanket roll 10 at the pressing height position Hc may be performed. In this case, while the blanket roll 10 is in contact with the margin 3b of the edge on the leading end side in the moving direction of the plate 3, and the portion of the blanket roll 10 that has been in contact with the margin 3b of the plate 3 is The height of the blanket roll 10 brought into contact with the upper surface of the plate 3 or the printing target 5 may be controlled to be displaced to the pressing height position Hc while being in contact with the printing target 5.

  When the blanket roll 10 is brought into contact with the plate 3 or the printing object 5, first, the same procedure as the procedure shown in FIGS. 7 to 11 is performed, so that the plate 3 and the printing object 5 of the blanket roll 10 are processed. After controlling the contact pressure to the predetermined pressure P, the blanket roll 10 is in contact with the printing pattern forming area 3a of the plate 3 and in contact with the printing pattern forming area 3a of the plate 3 in the blanket roll 10. The blanket roll 10 may be controlled to be held at the height position at the time when the contact pressure becomes the predetermined pressure P while the portion thus made is in contact with the printing object 5.

  As the lifting / lowering actuator of the blanket roll 10, any type of lifting / lowering actuator other than the ball screw mechanism 13 may be adopted as long as the blanket roll 10 can be lifted / lowered within a predetermined range. The arrangement may be changed as appropriate.

  As long as the height sensor can detect the height position of the blanket roll 10, any type of height sensor other than the encoder 14 attached to the elevating drive motor 26 of the ball screw mechanism 13 may be adopted. . Further, the arrangement may be appropriately changed according to the type of the height sensor to be employed.

  If the contact pressure when the blanket roll 10 is brought into contact with the plate 3 or the printing object 5 by the lifting actuator can be detected, the mounting attached to the nut member 28 of the ball screw mechanism 13 and the roll support frame 21. Any type and arrangement of pressure sensors other than the load cell 15 interposed between the members 29 may be adopted.

  The encoder 12 for detecting the rotation angle of the blanket roll 10 replaces the structure attached to the drive motor 11 for rotation, as shown by a two-dot chain line in FIG. Of these, a configuration may be adopted in which the rotary shaft 20 is connected directly to the end of the rotary shaft 20 opposite to the rotary shaft 20 connected to the rotary drive motor 11 via the speed reducer 30. With this configuration, the rotation angle of the blanket roll 10 can be detected without being affected by the backlash of the gear in the speed reducer 30 or the deflection of the power transmission system. Since the peripheral speed and the moving speed of the printing plate 5 as the plate table 4 travels and the moving speed of the printing object 5 as the printing target table 6 travels can be synchronized with each other, the printing accuracy can be further increased. The improvement effect can be expected.

  Depending on the transfer characteristics of the ink from the plate 3 to the blanket roll 10 and the transfer characteristics of the ink from the blanket roll 10 to the print target 5, the contact pressure between the blanket roll 10 and the plate 3 and the print target 5 of the blanket roll 10 with respect to the print target 5 The contact pressure may be different.

  When performing the transfer process from the plate 3 to the blanket roll 10, when the blanket roll 10 is brought into contact with the plate 3 on the plate table 4, the peripheral speed of the blanket roll 10 and the moving speed of the plate 3 as the plate table 4 travels. And the start of rotation of the blanket roll 10, the start of rotation of the blanket roll 10, and the start of descent from the retreat height position Ha of the blanket roll 10 may be in any order, and a plurality of The operation may be started at the same timing.

  Similarly, when the retransfer process from the blanket roll 10 to the printing target 5 is performed, at the time when the blanket roll 10 is brought into contact with the printing target 5 on the printing target table 6, the peripheral speed of the blanket roll 10 and the printing target table 6 If the movement speed of the printing target 5 accompanying the traveling is synchronized, the starting of the printing target table 6, the rotation of the blanket roll 10, and the start of the lowering of the blanket roll 10 from the retreat height position Ha are: An arbitrary order may be used, and a plurality of operations may be started at the same timing.

  In each of the above-described embodiments, when the transfer mechanism unit 9 performs a transfer operation, the end portion (right end portion in the drawing) of the plate table 4 or the printing target table 6 near the other end in the longitudinal direction of the guide rail 2 is used as a reference. As shown, the table positions Xa, Xb, Xc, Xd, and Xe are defined. However, the reference for determining the table positions of the tables 4 and 6 may be set at an arbitrary position of the tables 4 and 6. .

  The inking device 32 may use any type of inking device 32 other than that shown in FIG. 1 as long as appropriate inking can be performed on the plate 3 held on the plate table 4.

  The offset printing apparatus of the present invention may be applied to print on a printing target other than the substrate.

  Of course, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Stand 2 Guide rail 3 Plate 3a Print pattern formation area 3b Blank 4 Plate table 5 Print target 6 Print target table 7 Drive device 10 Blanket roll 11 Drive motor for rotation 13 Ball screw mechanism (lifting actuator)
16 Control device

Claims (4)

A rotating blanket roll is brought into contact with a plate held on a plate table running on a guide rail on a gantry, and then the blanket roll is applied to a printing target held on a printing target table running on the guide rail. In the offset printing method in which the transfer from the plate to the blanket roll and the retransfer from the blanket roll to the printing object are performed by contacting, the peripheral speed of the rotating blanket roll and the travel of the plate table a plate while being synchronized with the moving speed of the associated, until the margin at the leading edge in the moving direction side of the print pattern forming region of the plate to reach the position directly below the blanket roll, moving the lowering speed of the blanket roll edition is lowered in synchronization with the speed, the upper side of the moving direction tip end side of the margin of the plate, the blanket low And were allowed to contact at a peripheral speed synchronized with the speed of movement of the plate, the blanket roll so as to contact with the print-patterned area of the plate, then the peripheral speed of the blanket roll to the rotary printing target table in a state of being synchronized with the movement speed of the printing object associated with the traveling, transfer Dokata direction front end of the print target before reach the position directly below the above blanket roll, the printed lowering speed of the blanket roll The blanket roll is moved down in synchronization with the moving speed, and a portion of the blanket roll that is in contact with the blank on the leading end side in the moving direction from the printing pattern forming area of the plate is brought into contact with the upper side of the printing target. A portion of the plate in contact with the printing pattern formation region is brought into contact with the printing object. Printing method.   The contact pressure or roll height position of the blanket roll is controlled to a predetermined value while the blanket roll is in contact with the margin on the front side in the moving direction with respect to the printing pattern forming area in the plate, and the controlled contact pressure or The blanket roll holding the roll height position is brought into contact with the printing pattern forming area of the plate, and the portion of the blanket roll that is in contact with the margin on the front side in the moving direction than the printing pattern forming area of the plate is The contact pressure or roll height position of the blanket roll is controlled to a predetermined value while being in contact with the printing object, and the controlled contact pressure or roll height position is maintained, and 2. The o according to claim 1, wherein a portion of the printing plate in contact with the printing pattern forming region is brought into contact with the printing object. Set printing method. A plate table and a printing target table that run on a guide rail provided on a gantry are provided, and a blanket roll is sequentially brought into contact with the printing plate held on the printing table and the printing target held on the printing target table. An offset printing apparatus configured to perform transfer from the plate to the blanket roll and retransfer from the blanket roll to the printing target, the blanket roll rotation drive motor, the lift actuator, and the drive device for each table And a function for synchronizing the peripheral speed of the rotating blanket roll and the movement speed of the plate accompanying the travel of the plate table, and the movement of the control device relative to the printing pattern forming area in the plate. by forward end side of the margin it is reach the position directly below the blanket roll, the blanket And the lowering speed of the trawl is lowered in synchronization with the plate of the moving speed, contact touch causes function blanket roll to the rotation on the upper side of the moving direction tip end side of the margin of said plate, and the peripheral speed of the blanket roll to the rotating printing and ability to synchronize the moving speed of the print target with the traveling of the printing object table, until transfer Dokata direction tip end portion of the printing medium is reach the position directly below the above blanket roll, the descending speed of the blanket roll and is lowered in synchronization with the target movement speed, on the upper side of the printed, a function to let come in contact with is brought into contact with the margin of the moving direction tip end portion than the print pattern forming regions of the plate in the blanket roll An offset printing apparatus characterized by having a configuration formed as described above.   A function of controlling the contact pressure or roll height position of the blanket roll and the plate to a predetermined value while the blanket roll is in contact with the margin on the front side in the moving direction with respect to the printing pattern forming region in the plate; The contact pressure or roll height position between the blanket roll and the printing object is determined while the portion of the blanket roll that is in contact with the margin on the front side in the moving direction from the printing pattern forming area of the plate is in contact with the printing object. The offset printing apparatus according to claim 3, further comprising a function of controlling to a predetermined value.

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