JP2010228134A - Printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing machine which guides a flat sheet conveyed by an impression cylinder and a transfer cylinder without flapping with a simple constitution without requiring a guiding apparatus provided with a blower. <P>SOLUTION: To achieve the purpose, there is provided such a constitution that the outer peripheral faces of transfer cylinders 5 and 7 are formed of a silicon layer, and rollers 12 and 13 are pressed on the flat sheet conveyed by the transfer cylinders 5 and 7. In addition, in the impression cylinders 4a, 4b, 4c and 4d for conveying the flat sheet printed by passing opposing points to plate cylinders 2a, 2b, 2c and 2d, there is provided such a constitution that rollers 10 and 11, the outer peripheral face of which is coated with a silicon and molded, are pressed on the flat sheet on the impression cylinders 4a, 4b, 4c and 4d on the downstream side of the opposing points. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus and method for preventing printing sheet ink from being transferred to a cylinder or causing a sheet to flutter and damage the cylinder in a printing machine.

  In the transfer cylinder of the conventional printing machine disclosed in Patent Document 1, the sheet is float-guided by the guide surface provided with the nozzle for blowing, and is guided without contact between the transfer cylinder and the guide surface. It was to be done. With this configuration, when the printed sheet is transported by the transfer cylinder, if the air flow is adjusted according to the quality of the sheet, unnecessary flickering of the sheet is reduced and floating. Since the guide is guided, the ink is prevented from being transferred to the transfer cylinder and from being damaged by the sheet.

JP 2000-168047 A

  However, the transfer cylinder having such a guide surface not only has a problem that a blower facility is required and the manufacturing cost is high, but also an air flow rate or the like in order to perform an appropriate blown air according to the paper quality of the sheet. Adjustment of wind direction and the like is necessary, and high skill was required for the operator. Further, when the air volume adjustment or the like is not properly performed, a paper jam occurs in a narrow gap between the transfer cylinder and the guide surface, and the transfer cylinder may be damaged, and maintenance is necessary.

  The present invention solves the above-mentioned problem with a simple configuration, and is particularly suitable for a cylinder of a printing press using ink for waterless printing.

  In order to achieve the above object, in the first aspect of the present invention, the outer peripheral surface of the transfer drum is formed of a silicon layer, and the roller is pressed against the sheet conveyed by the transfer drum. According to a second aspect of the present invention, in the impression cylinder for transporting a printed sheet passing through a point facing the rubber cylinder, silicon is applied to the outer peripheral surface on the downstream side of the point facing and molded. The roller was pressed against the sheet on the impression cylinder.

  Since the transfer cylinder and the impression cylinder of the present invention have the above-described configuration, it is possible to suppress fluttering of the sheet with a simple configuration, the ink is transferred to the transfer cylinder, the printed surface of the sheet is damaged, the transfer cylinder and This has the effect of eliminating the problem of scratching the impression cylinder.

It is a schematic diagram of the principal part of the printing press concerning this invention. It is an enlarged view of the trunk | drum of the printing press concerning this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings.

  In FIG. 1, reference numerals 1a, 1b, 1c, and 1d denote printing units that constitute a printing press, and in this example, 4 units. In the case of four-color printing on one side, printing is performed in the direction of the arrow S in FIG. 1 in the order of black, cyan, magenta, and yellow, for example. 6, 6 a, 6 b constitute a transfer cylinder with a reversing mechanism. When performing double-sided printing by reversing, one side is printed by the printing units 1 a, 1 b, and the other side is printed by the printing units 1 c, 1 d. Print the side. 2a, 2b, 2c, and 2d are plate cylinders, 3a, 3b, 3c, and 3d are rubber cylinders, and 4a, 4b, 4c, and 4d are impression cylinders, which are the main elements constituting the printing units 1a, 1b, 1c, and 1d, respectively. It is. Each of the plate cylinders 2a, 2b, 2c, and 2d is provided with an ink supply device (not shown). Reference numeral 5 denotes a transfer cylinder for transporting a sheet from the printing unit 1a to the printing unit 1b, and 7 is a similar transfer cylinder. It is the role of the intermediate cylinder 8 to deliver the sheet fed in the direction of the arrow S from a sheet feeder (not shown) to the first impression cylinder 4a. Reference numeral 9a denotes a paper discharge cylinder, which receives a printed sheet from the impression cylinder 4d, holds it with a gripper (not shown) of the chain 9b, and conveys it in the direction of arrow T to a paper discharge apparatus (not shown).

  Since the transfer cylinders 5 and 7 are formed by applying silicon to the outer peripheral surface of the cylinder, the transfer cylinders 5 and 7 have a property (repellency) of repelling waterless printing ink well.

  FIG. 2 is an enlarged view of the periphery of the impression cylinder 4c of FIG. 1, and FIG. 1 shows rollers 10, 11, 12, 13 formed by applying silicon according to the present invention, not shown, to the outer peripheral surface. ing. Regarding the rollers 12 and 13, in the case of single-sided printing, it is not necessary to apply silicon to the outer peripheral surface, but in consideration of double-sided printing, it is desirable to apply silicon to the outer peripheral surface. The rollers 10 and 11 can be pressed against or separated from the impression cylinder 4c by a contact / separation mechanism (not shown). Similarly, the rollers 12 and 13 can be pressed against or separated from the transfer cylinder 7 by a contact / separation mechanism (not shown).

  Next, the operation of the present invention will be described. In FIG. 1, when a sheet is conveyed in the direction of arrow S from a sheet feeding device (not shown), the sheet is transferred via the intermediate cylinder 8 to the impression cylinder 4a of the first printing unit 1a. A sheet of paper held by a gripping claw (not shown) of the impression cylinder 4a is printed with black ink of the first color when the impression cylinder 4a passes through an opposing point which is a contact point between the impression cylinder 4a and the rubber cylinder 3a. Is done. Hereinafter, printing proceeds as in a conventional printing machine, and the sheet is conveyed while being printed on the downstream side of the printing machine, and may or may not be reversed by the transfer cylinders 6a, 6 and 6b with a reversing mechanism. It is transported and replaced by a gripping claw (not shown) of the impression cylinder 4c.

  In FIG. 2, when a sheet fed by a gripping claw (not shown) of the impression cylinder 4c passes through an opposing point A, which is a contact point between the rubber cylinder 3c and the impression cylinder 4c, the third color magenta It is printed with ink, and then receives a force from the rollers 10 and 11 so as to be pressed against the impression cylinder 4c at points B and C facing the rollers 10 and 11. The flutter of the sheet is suppressed and smoothly guided by the rollers 10 and 11 and conveyed downstream. However, since the outer peripheral surfaces of the rollers 10 and 11 are coated with silicon as described above, there is no silicon and water. The ink strongly binds to the sheet due to repulsion with the printing ink, and the ink does not move to the rollers 10 and 11.

  Similarly, in FIG. 2, the sheet that has been replaced by the transfer cylinder 7 is conveyed with the printing surface directed toward the transfer cylinder 7, but is reversed by the transfer cylinder (6, 6 a, 6 b) with a reversing mechanism. In this case, the ink printed on the upstream side is also attached to the back surface (the rollers 12 and 13 side). The sheet conveyed by the transfer cylinder 7 receives a force from the rollers 12 and 13 so as to be pressed against the transfer cylinder 7 at points D and E facing the rollers 12 and 13. The flutter of the sheet is suppressed and smoothly guided by the rollers 12 and 13 and conveyed to the downstream side. However, since the outer peripheral surface of the transfer cylinder 7 and the rollers 12 and 13 is coated with silicon as described above, The ink strongly binds to the sheet due to the repulsion between the silicon and the ink for waterless printing, and the ink does not move to the transfer cylinder 7 or the rollers 12 and 13.

  In a general printing machine, the gripping claw (not shown) of the transfer cylinder 7 protrudes slightly above the surface of the transfer cylinder 7, and therefore collides with the rollers 12 and 13, which is inconvenient. Therefore, it is necessary to allow the rollers 12 and 13 to escape from hitting the gripping claws (not shown) of the transfer cylinder 7 using a cam mechanism. Since the technology relating to this cam mechanism is disclosed in Japanese Patent Application Laid-Open No. 2008-23945, description thereof is omitted here.

  The printing press according to the present invention is not limited to the above-described embodiment. For example, although two rollers 10 and 11 are opposed to the impression cylinder 4c, one or three rollers may be used. Various modifications and improvements are possible within the range described. Furthermore, the present invention can also be applied to a transfer cylinder (6, 6a, 6b) with a reversing mechanism.

  In the present invention, it is possible to suppress sheet flutter with a simple configuration in which the rollers 10, 11, 12, and 13 are brought into contact with and separated from the transfer cylinders 5 and 7 or the impression cylinders 4a, 4b, 4c, and 4d. As a result, the ink is transferred to the transfer cylinders 5 and 7 and the rollers 10, 11, 12, and 13 and the printed surface of the sheet is damaged, or the transfer cylinders 5 and 7 and the impression cylinders 4a, 4b, 4c, and 4d are damaged. The problem of attaching is eliminated and it is extremely useful.

1a, 1b, 1c, 1d Printing unit 2a, 2b, 2c, 2d Plate cylinder 3a, 3b, 3c, 3d Rubber cylinder 4a, 4b, 4c, 4d Impression cylinder 5, 6, 7 Transfer cylinder 10, 11, 12, 13 roller

Claims (2)

  In a transfer cylinder that transports printed sheets between printing units of a printing press, an outer peripheral surface of the transfer cylinder is formed of a silicon layer, and a roller is pressed against the sheet transported by the transfer cylinder A printing machine featuring.   In a pressure drum that conveys a printed sheet that passes through a point facing the rubber cylinder, a roller formed by applying silicon to the outer peripheral surface downstream of the point is formed on the sheet on the pressure drum. 2. The printing press according to claim 1, wherein the printing press is pressed against paper.

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