JP2006289731A - Printing press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing press having a high printing precision, regarding a gravure printing press. <P>SOLUTION: The gravure printing press 1 is composed of a table 5 whereon printing matter 4 is placed, a gravure roll 2 whereon a figure to be printed is engraved and a blanket roll 3 which comes into contact with the gravure roll 2, while rotating, so that ink on the surface of the gravure roll 2 is transferred onto it. The blanket roll moves horizontally relatively to the table 5 so that it rolls on the surface of the printing matter 4, and transfers the ink onto the matter 4. The press has a blanket motor 9 consisting of a servomotor that rotates the blanket roll 3, a horizontal movement motor 10 consisting of the servomotor that moves the blanket roll 3 or the table 5 horizontally and a control means 13 for controlling the respective speed of the blanket motor 9 and the horizontal movement motor 10. The control means 13 makes different the peripheral speed of the blanket roll 3 and the speed of horizontal movement of the blanket roll 3 or the table 5 different from each other by changing the speed of the blanket motor 9 or the horizontal movement motor 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a printing press.

  Printing technology has been diverted for manufacturing electronic devices, and flexographic printing machines and gravure printing machines that form alignment films on glass substrates are known. In addition, in order to perform high-precision printing on a substrate or the like, a gravure printing machine having higher accuracy of the original plate than the flexographic plate is more advantageous.

  As shown in FIG. 2, a conventional gravure printing machine 21 includes a gravure roll 22 engraved with a graphic to be printed, a resin blanket roll 23 for transferring ink in an engraving groove of the gravure roll 22, and a printing material. It consists of a lifting table 25 on which a certain glass substrate 24 is placed. The blanket roll 23 has a main gear 26 and is driven by a drive motor 27. The gravure roll 22 has a driven gear 28 that meshes with the main gear 26 and rotates in synchronization with the blanket roll 23 to transfer a figure engraved on the surface without deviation. Further, the gravure roll 22 has an auxiliary motor 29 with a clutch mechanism so that it can continue to rotate when it is separated from the blanket roll 23, and a doctor blade 30 that removes excess ink that protrudes outside the engraving groove. Yes.

  The blanket roll 23 is supported by a slider 32 that slides on a horizontal guide 31, and can move horizontally along the guide 31 when the main gear 26 is engaged with the rack 33. The rack 33 has a lifting / lowering part 33a that partially lifts and lowers, while the graphic of ink is transferred from the gravure roll 22 to the blanket roll 23, the lifting / lowering part 33a moves away from the main gear 26 and the blanket roll 23 moves horizontally. You can avoid it. After the ink figure is transferred to the blanket roll 23, the elevating part 33 a meshes with the main gear 26, and the blanket roll 23 moves horizontally while rotating, so that the ink figure on the blanket roll 23 is further transferred to the glass substrate 24. Can be transferred to. When the drive motor 25 is reversely rotated and the blanket roll 23 is pulled back to the vicinity of the gravure roll 22, the lifting table 25 is lowered so as not to rub the ink pattern transferred onto the glass substrate 24.

  In the conventional gravure printing machine 21, it is necessary to match the peripheral speed between the surface of the gravure roll 22 and the surface of the blanket roll 23, the peripheral speed of the surface of the blanket roll 23, and the speed of translation in order to prevent printing deviation. The pitch circles of the main gear 26 and the driven gear 28 are equal to the outer shapes of the blanket roll 23 and the gravure roll 22, respectively, and the pitch center of the rack 33 is the same height as the surface of the glass substrate 24.

  Every year, higher accuracy is required for printing related to the manufacture of devices such as display panels. Currently, dimensional accuracy and positioning accuracy of 10 μm or less are required. However, since the conventional gravure printing machine engraves the printed figure on the cylindrical surface, the processing accuracy of the original plate is limited. Naturally, the conventional gravure printing machine cannot achieve printing accuracy exceeding the accuracy of engraving of the original plate, and there is a problem that it is difficult to satisfy the required printing accuracy.

  Therefore, an object of the present invention is to provide a printing press with high printing accuracy.

  In order to solve the above problems, a first aspect of a gravure printing machine according to the present invention is a table on which a printing material is placed, a figure to be printed on a cylindrical surface, and ink is applied to the cylindrical surface. The gravure roll and the gravure roll are in contact with the gravure roll while being rotated, the ink of the gravure roll is transferred to the cylindrical surface, and the surface of the printing material placed on the table rolls relative to the table. A blanket motor that horizontally moves to transfer the ink transferred onto the cylindrical surface to the substrate, and a blanket motor that includes a servo motor that rotates the blanket roll; and the blanket roll or the table is moved horizontally. A horizontal movement motor comprising a servo motor, and the speeds of the blanket motor and the horizontal movement motor. Control means for controlling, the control means changes the speed of the blanket motor or the horizontal movement motor, the peripheral speed of the blanket roll, the horizontal movement speed of the blanket roll or the table, Shall be different.

  According to this configuration, the peripheral speed of the blanket roll and the relative speed of the blanket roll and the table are slightly different, and the figure of the ink transferred from the gravure roll on the blanket roll is enlarged or reduced in the printing direction to be covered. Can be transferred to printed matter. In this way, it is possible to finely adjust the length in the circumferential direction of the figure engraved on the gravure roll with high accuracy and print it on the substrate. Further, the position in the printing direction can be finely adjusted with high accuracy.

  In the gravure printing machine according to the first aspect of the present invention, if the horizontal movement motor is a linear motor, the configuration is simple because no gear or the like is required for the relative horizontal movement of the blanket roll and the table.

  A gravure printing machine according to a second aspect of the present invention includes a table on which a printing material is placed, a gravure roll in which a figure to be printed is engraved on a cylindrical surface, and ink is applied to the cylindrical surface, and the gravure The ink of the gravure roll is transferred to the cylindrical surface by rotating and contacting the roll, and moved horizontally so as to roll on the surface of the printing material placed on the table, and the ink transferred to the cylindrical surface is transferred. A gravure motor comprising a servo motor for rotating the gravure roll; a blanket motor comprising a servo motor for rotating the blanket roll; and a speed of the gravure motor and the blanket motor. Control means for controlling the gravure motor or bra By changing the speed of packet motor shall varying the peripheral speed of the blanket roll and the gravure roll.

  According to this configuration, the gravure roll and the blanket roll can be slightly different in peripheral speed, and the gravure roll figure can be transferred to the blanket roll after being enlarged or reduced in the circumferential direction. As a result, the gravure roll figure can be printed on the substrate by enlarging or reducing the figure in the printing direction.

  As described above, according to the present invention, since the drive mechanism that has been conventionally connected by the gears can be independently controlled by a plurality of servo motors, when transferring the graphic of the ink, the relative relationship between the transfer source and the transfer destination is determined. By slightly varying the speed, it is possible to provide a printing machine that can obtain printing accuracy that exceeds the engraving accuracy of the original.

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 shows a gravure printing machine 1 according to one embodiment of the present invention. The gravure printing machine 1 includes a gravure roll 2 engraved with a graphic to be printed on a cylindrical surface, a blanket roll 3 made of resin, and a lifting table 5 on which a glass substrate 4 as a printing object is placed. 2 is rotatable by a gravure motor 6, ink is supplied to the surface from an ink supply device 7, and ink outside the engraving groove is scraped off by a doctor blade 8. The blanket roll 3 can be rotated by a blanket motor 9, is supported by a mover 11 of a linear motor (horizontal movement motor) 10, and extends along a stator rail 12 that serves as both a stator of the linear motor 10 and a guide guide. Can move horizontally. The gravure motor 6, the blanket motor 9, and the linear motor 10 are sinusoidal PWM AC servomotors and are controlled by a control device (control means) 13. Moreover, the raising / lowering table 5 can be raised / lowered up and down.

A printing operation of the gravure printing machine 1 having the above configuration will be described.
The gravure roll 2 is rotated in the direction of the arrow by the gravure motor 6, and the doctor blade 8 fills the ink only in the engraving groove. The blanket roll 3 is brought into contact with the gravure roll 2 by the linear motor 10 while being rotated in the direction of the arrow by the blanket motor 9. At this time, the timing is controlled so as to contact the blanket roll 3 outside the engraving pattern of the gravure roll 2. Usually, the control device 13 controls the gravure roll 2 and the blanket roll 3 so that the peripheral speeds of both surfaces are the same, and the ink in the engraving groove of the gravure roll 2 causes the engraving groove to be formed on the surface of the blanket roll 3. The image is transferred to the inverted shape.

  When the ink figure is transferred to the blanket roll 3, the blanket roll 3 is separated from the gravure roll 2 by the linear motor 10 and moves on the lifting table 5. At this time, the lifting table 5 is held such that the surface of the glass substrate 4 is at the same height as the lower end of the blanket roll 3. The control device 13 controls the horizontal movement speed of the mover 11 of the linear motor 10 so as to be the same as the peripheral speed of the surface of the blanket roll 3, and the ink pattern of the blanket roll 3 is shifted to the surface of the glass substrate 4. Without being transferred to form a printed figure. Thus, the figure engraved on the gravure roll 2 is transferred to the glass substrate 4 through the blanket roll 3 without any difference. When the printed figure is transferred to the glass substrate 4, the lifting table 5 is lowered, and the blanket roll 3 is pulled back to the vicinity of the gravure roll 2 by the linear motor 10.

  Here, when the printed figure actually transferred to the glass substrate 4 is longer in the moving direction of the blanket roll 3 than the figure to be obtained, the control means slows the moving speed of the mover 11 of the linear motor 10. Thereby, the blanket roll 3 transfers the figure while sliding on the glass substrate 4, and forms a figure obtained by uniformly shortening the printed figure on the gravure roll 2 on the glass substrate 4. The shortening rate of the printed figure is, for example, several tens of μm with respect to the 40-inch glass substrate 4. Very few. Therefore, the printed figure is not rubbed and disturbed, and the printed figure can be shortened in units of μm. Conversely, when making the printed figure longer, the control device 13 may increase the moving speed of the linear motor 10.

  Since the gravure roll 2 engraves a figure on the cylindrical surface, a dimensional error tends to occur in the circumferential direction. However, the gravure printing machine 1 prints a printed image in the moving direction of the blanket roll 3 that coincides with the circumferential direction of the gravure roll 2. Since the length can be finely adjusted, printing can be performed while correcting the dimensional error of the gravure roll 2 engraving.

  Further, in the gravure printing machine 1, after the figure is transferred from the gravure roll 2 to the blanket roll 3, the size of the printed figure can be reduced by increasing or decreasing the peripheral speed of the blanket roll 3 with respect to the horizontal movement speed of the linear motor 10. Can be adjusted. Further, the size of the printed figure can be finely adjusted by increasing or decreasing the peripheral speed of the gravure roll 2 with respect to the peripheral speed of the blanket roll 3.

  The gravure printing machine 1 of this embodiment uses a linear motor 10 to move the blanket roll 3 horizontally, but the gear meshing with the rack may be driven by a servo motor, or the ball screw is driven by a servo motor. It may be driven by any other method. Further, the lifting table 5 may be moved horizontally without moving the blanket roll 3.

  In addition, when transferring the graphic of the ink from the gravure roll 2 to the blanket roll 3, if it is not necessary to make the speeds of the two different, the gravure roll 2 is connected to the blanket roll 3 with a gear and synchronized as in the prior art. May be rotated. Moreover, when increasing / decreasing the rotational speed of the gravure roll 2, you may perform the horizontal movement of the blanket roll 3 by making the gear driven with the blanket motor 9 mesh with the rack arrange | positioned horizontally like the past.

1 is a schematic view of a gravure printing machine according to an embodiment of the present invention. Schematic diagram of a conventional gravure printing machine.

Explanation of symbols

1 Gravure Printing Machine 2 Gravure Roll 3 Blanket Roll 4 Glass Substrate (Printed Material)
5 Lifting table 6 Gravure motor 9 Blanket motor 10 Linear motor (horizontal movement motor)
13 Control device (control means)

Claims (3)

A table on which the substrate is placed;
A gravure roll in which a figure to be printed on a cylindrical surface is engraved, and ink is applied to the cylindrical surface;
The ink of the gravure roll is transferred to the cylindrical surface while rotating and contacting the gravure roll, and moves relative to the table so as to roll on the surface of the printed material placed on the table. A blanket roll for transferring the ink transferred to the cylindrical surface to the substrate,
A blanket motor consisting of a servomotor that rotates the blanket roll;
A horizontal movement motor consisting of a servo motor that horizontally moves the blanket roll or the table;
Control means for controlling the speed of the blanket motor and the horizontal movement motor,
The control means is configured to change the peripheral speed of the blanket roll and the horizontal movement speed of the blanket roll or the table by changing the speed of the blanket motor or the horizontal movement motor. Printer.   The gravure printing machine according to claim 1, wherein the horizontal movement motor is a linear motor. A table on which the substrate is placed;
A gravure roll in which a figure to be printed on a cylindrical surface is engraved, and ink is applied to the cylindrical surface;
The ink of the gravure roll is transferred to the cylindrical surface while rotating and contacting the gravure roll, and moves relative to the table so as to roll on the surface of the printed material placed on the table. A blanket roll for transferring the ink transferred to the cylindrical surface to the substrate,
A gravure motor composed of a servomotor that rotates the gravure roll;
A blanket motor consisting of a servomotor that rotates the blanket roll;
Control means for controlling the speed of the gravure motor and the blanket motor,
The said control means changes the speed of the said gravure motor or the said blanket motor, and makes the peripheral speed of the said gravure roll and the said blanket roll differ, The gravure printing machine characterized by the above-mentioned.

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