JP2011240570A - Gravure-offset printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high definition printing by increasing the amount of ink delivered from a gravure cylinder and preventing transfer failures, in a gravure-offset printing machine.SOLUTION: An impression cylinder 6 is separated from a blanket cylinder 4, when ink is being delivered to a blanket cylinder 4 from the gravure cylinder 1 with recesses to be filled with ink 2 formed on the circumferential surface thereof. While, the gravure cylinder 1 is separated from the blanket cylinder 4, when ink is being transferred from the blanket cylinder 4 to a matter 7 to be printed. Furthermore, the rotation speed V2 of the blanket cylinder 4 and the gravure cylinder 1, when ink is delivered to the blanket cylinder 4, is relatively slower than the rotation speed of the blanket cylinder 4 and the impression cylinder 6 when ink is being transferred to the matter to be printed 7.

Description

  The present invention relates to a gravure offset printing machine suitable for printing on a relatively hard substrate such as an insulating substrate, glass or metal plate.

  As a conventional gravure printing machine, a gravure plate cylinder in which concave portions for filling an ink and forming an image line portion are provided on the peripheral surface, and an ink supply means for supplying ink to the peripheral surface of the gravure plate cylinder, The gravure plate cylinder and an impression cylinder facing each other's peripheral surface and supplying the printed material between the respective peripheral surfaces, and transferring the ink filled in the concave portion of the gravure plate cylinder to the printed material (For example, refer to Patent Document 1).

  In the gravure printing machine described in Patent Document 1, a printing material enters a recess for forming an image line portion of the gravure plate cylinder at a position where the gravure plate cylinder and the impression cylinder face each other. The ink is transferred to the substrate by taking the ink. However, in the conventional gravure printing machine as described above, there is variation in the transfer of ink to the printing material due to the material of the printing material, the viscosity of the ink, etc., and the ink filled in the recesses of the gravure plate cylinder is gravure. There has been a transfer defect in which a necessary amount is not necessarily transferred onto the printing material supplied between the plate cylinder and the impression cylinder. In particular, when the printed material is formed of a relatively hard material such as an insulating substrate, glass, or metal plate, the amount of the printed material that enters the concave portion of the gravure plate cylinder is reduced, so that the transfer defect becomes more prominent. There was a problem of becoming. In order to solve this problem, a blanket cylinder is interposed between the gravure plate cylinder and the impression cylinder, and the blanket cylinder removes more ink in the recesses of the gravure plate cylinder, which is necessary for the substrate. An amount of ink was transferred.

Japanese Patent Application Laid-Open No. 07-24990

  In the conventional gravure offset printing press as described above, the transfer speed for transferring ink from the gravure plate cylinder to the blanket cylinder and the transfer speed for transferring the ink from the blanket cylinder to the printed material are the same. For this reason, if the time for transferring ink to the blanket cylinder is increased in order to increase the amount of ink transferred to the blanket cylinder, the transfer time also becomes longer, and the shape of the ink transferred from the blanket cylinder to the substrate remains unchanged. It becomes impossible to keep and it becomes easy to deform. On the other hand, when the transfer time to the printing material is shortened, the delivery time to the blanket cylinder is shortened, and there is a problem that a sufficient amount of ink is not delivered to the blanket cylinder.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to increase the amount of ink delivered from the gravure plate cylinder and prevent high-definition printing and provide high-definition printing. is there.

  In order to achieve this object, the present invention provides a gravure printing cylinder in which a concave portion filled with ink is provided on the peripheral surface, a blanket cylinder to which ink is transferred from the concave portion of the gravure printing cylinder, and the blanket cylinder. In a gravure offset printing machine comprising an impression cylinder facing and facing a blanket cylinder, the impression cylinder is removed from the blanket cylinder when ink is delivered to the blanket cylinder. 1 cylinder attaching / detaching device, a second cylinder attaching / detaching device for removing the gravure printing cylinder from the blanket cylinder when ink is transferred to the substrate, and a blanket when ink is transferred to the blanket cylinder The rotation speed of the cylinder and the gravure plate cylinder is higher than the rotation speed of the blanket cylinder and the impression cylinder when the ink is transferred to the substrate. It is obtained by a slower such drive means.

  According to the present invention, in the invention, the impression cylinder is rotated by rotation of the blanket cylinder when the impression cylinder is attached to the blanket cylinder by the first cylinder attaching / detaching device, and the gravure printing cylinder is the second cylinder. When the blanket cylinder is worn by the attachment / detachment device, the blanket cylinder rotates.

  In the invention according to any one of the inventions described above, the diameter of the blanket cylinder is an integral multiple of 2 of the diameter of the gravure plate cylinder.

  According to the present invention, in any one of the above inventions, the ink has conductivity.

  According to the present invention, by relatively slowing the speed of transferring ink from the gravure plate cylinder to the blanket cylinder, the transfer time becomes longer, so the amount of ink that the blanket cylinder receives from the gravure plate cylinder can be increased. . Moreover, since it is not necessary to slow down the speed at which the ink is transferred from the blanket cylinder to the printing material, the ink is transferred to the printing material while maintaining the shape as it is, so that high-definition printing can be performed.

It is a side view which shows the arrangement | sequence of the cylinder of the principal part in the gravure offset printing machine which concerns on this invention. In the gravure offset printing press which concerns on this invention, it is a side view of the principal part for demonstrating the 1st and 2nd cylinder attachment / detachment apparatus. In the gravure offset printing press which concerns on this invention, it is a side view which shows the arrangement | sequence of the cylinder of the principal part for demonstrating the operation | movement which delivers ink from a gravure printing cylinder to a blanket cylinder. In the gravure offset printing press which concerns on this invention, it is a side view which shows the arrangement | sequence of the cylinder of the principal part for demonstrating the operation | movement which transfers ink to a to-be-printed material from a blanket cylinder.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  Reference numeral 1 denotes a gravure plate cylinder having a recess 1a filled with ink on the peripheral surface. The ink 2 supplied to the peripheral surface of the gravure plate cylinder 1 from the ink supply device (not shown) has conductivity, and is filled into the concave portion 1a by the doctor blade 3 and is applied to the peripheral surface. The excess ink that has adhered is scraped off.

  The gravure plate cylinder 1 is not provided with a drive source for rotating the gravure plate cylinder 1 and is rotatably supported between left and right frames (not shown), and a first cylinder attachment / detachment device 10A described later. By attaching to the blanket cylinder 4, the rotation of the blanket cylinder 4 rotates at the same speed as the blanket cylinder 4 and in the same rotation direction (counterclockwise in the figure).

  The blanket cylinder 4 is made of silicone, and the ink 2 is transferred from the concave portion 1a of the gravure plate cylinder 1 at a point A that contacts the gravure plate cylinder 1. The blanket cylinder 4 is rotated in the clockwise direction in the figure by driving of a motor 5 as a driving means whose driving force is switched in two stages, and the rotational speed is switched between speeds V1 and V2 which is relatively slower than V1.

  Reference numeral 6 denotes an impression cylinder facing the blanket cylinder 4, and the printed material 7 supplied between the impression cylinder 6 and the blanket cylinder 4 is a blanket cylinder 4 at a point B where the impression cylinder 6 faces the blanket cylinder 4. Ink is transferred. Similar to the gravure plate cylinder 1 described above, the impression cylinder 6 is not provided with a drive source for rotating the impression cylinder 6 and is supported rotatably between the left and right frames.

  Accordingly, when the impression cylinder 6 is attached to the blanket cylinder 4 by the second cylinder attaching / detaching device 10B described later, the impression cylinder 6 is rotated at the same speed as the blanket cylinder 4 by the rotation of the blanket cylinder 4 via the substrate 7 to be printed. Rotate at the same speed and in the same direction of rotation (counterclockwise in the figure). The impression cylinder 6 and the gravure plate cylinder 1 are formed with the same diameter R1, and the diameter R2 of the blanket cylinder 4 is formed twice as large as the diameter R1.

  Next, a first cylinder attaching / detaching apparatus 10A for attaching / detaching the gravure printing cylinder 1 to / from the blanket cylinder 4 and a second cylinder attaching / detaching apparatus 10B for attaching / detaching the impression cylinder 6 to / from the blanket cylinder 4 will be described with reference to FIG. Since both the first and second barrel attaching / detaching apparatuses 10A and 10B have the same structure, only the first trunk attaching / detaching device 10A will be described in detail here, and the second trunk attaching / detaching device as necessary. 10B will also be described.

  In FIG. 2, both end shafts of the blanket cylinder 4 and the gravure plate cylinder 1 are rotatably supported by left and right frames via bearings (both not shown). Both end shafts of the gravure plate cylinder 1 are rotatably supported by eccentric bearings 11A fitted to the left and right frames. A bracket 12A is supported on a stud 12A projecting outward from one frame, and a stepping motor 14A as a drive device is attached to the bracket 13A with the drive rod 15A suspended. Yes.

  By driving the stepping motor 14A to rotate the nut 16A, the drive rod 15A having a threaded portion engaged with the nut 16A is advanced or retracted downward or upward. A connecting lever 18A formed in an inverted L shape when viewed from the front is pivotally attached to the protruding portion of the lever shaft 17A positioned below the drive rod 15A and pivotally supported at both ends by the left and right frames.

  The eccentric bearing 11A includes an outer ring fitted to the housing via needle rollers and an inner ring rotatably fitted to the housing via a tapered roller in a housing fitted in a bearing hole of the frame. (Not shown). The bearing lever 19A fixed to the outer ring of the eccentric bearing 11A and the connecting lever 18A are connected by a rod 20A, and the driving rod 15A is advanced and retracted by the driving of the stepping motor 14A, thereby connecting the connecting lever 18A and the rod 20A. Further, the eccentric bearing 11A is configured to rotate via the bearing lever 19A.

  The axis of the inner ring inner peripheral surface constituting the eccentric bearing 11A and the axis of the outer ring outer peripheral surface of the eccentric bearing 11A are eccentric from each other by a predetermined dimension. Therefore, when the rod 15A of the stepping motor 14A is retracted from the state in which the gravure plate cylinder 1 is placed, the axis of the inner ring inner peripheral surface moves around the axis of the outer ring outer peripheral surface. As a result, the gravure plate cylinder 1 is separated from the blanket cylinder 4 as indicated by a two-dot chain line, and a gap is formed between the gravure cylinder 4 and the cylinder is removed.

  On the other hand, the eccentric bearing 11B of the impression cylinder 6 is also provided with the same mechanism for rotating the eccentric bearing 11B by driving the stepping motor 14B. Therefore, also in the impression cylinder 6, by rotating the stepping motor 14B and rotating the eccentric bearing 11B, the impression cylinder 6 is separated from the blanket cylinder 4 as shown by a two-dot chain line, and between the blanket cylinder 4 and the impression cylinder 6. A gap is formed and the body is removed.

  Next, the printing operation of the gravure offset printing machine configured as described above will be described with reference to FIGS. 3 and 4, for the convenience of explanation, the distance between the blanket cylinder 4 and the gravure plate cylinder 1 or the impression cylinder 6 is drawn exaggerated more than the actual distance.

  First, the stepping motor 14A of the first body attaching / detaching device 10A is driven and the rod 15A moves forward, whereby the eccentric bearing 11A rotates via the connecting lever 18A, rod 20A, and bearing lever 19A. The cylinder 1 is attached to the blanket cylinder 4 as shown in FIG.

  At the same time, the stepping motor 14B of the second cylinder attaching / detaching device 10B is driven and the rod 15B is retracted, whereby the eccentric bearing 11B is rotated via the connecting lever 18B, the rod 20B, and the bearing lever 19B. 6 is separated from the blanket cylinder 4.

  In this state, the motor 5 is driven and the blanket cylinder 4 rotates at a relatively slow speed V2. The gravure plate cylinder 1 attached to the bracket cylinder 4 starts to rotate counterclockwise in the figure at the same speed V2 as the bracket cylinder 4 by the rotation of the blanket cylinder 4. Next, ink 2 is supplied to the peripheral surface of the gravure plate cylinder 1 from an ink supply device (not shown), whereby the ink 2 is filled into the recess 1a by the doctor blade 3 and the peripheral surface of the gravure plate cylinder 1 Excess ink adhering to the ink is scraped off.

  The ink 2 filled in the recess 1a starts to be transferred to the blanket cylinder 4 at point A, and is transferred from the gravure plate cylinder 1 to the blanket cylinder 4. At this time, since the gravure plate cylinder 1 and the blanket cylinder 4 are both rotated at a relatively slow speed V2, the delivery time of the ink 2 from the gravure plate cylinder 1 to the blanket cylinder 4 becomes relatively long. For this reason, a predetermined amount of the ink on the gravure plate cylinder 1 is transferred from the inside of the recess 1a to the blanket cylinder 4 in spite of the silicone blanket cylinder 4 having a small surface energy and difficult to adhere ink.

  Further, as the blanket cylinder 4 and the gravure plate cylinder 1 are rotated, the ink 2 filled in the recess 1a is sequentially transferred to the blanket cylinder 4 as shown in FIG. When the head reaches the point B, the stepping motor 14A of the first body attaching / detaching device 10A is driven, and the rod 15A is retracted. Therefore, the gravure plate cylinder 1 is separated from the blanket cylinder 4 as shown in FIG.

  At the same time, the stepping motor 14B of the second cylinder attaching / detaching device 10B is driven and the rod 15B moves forward, so that the eccentric bearing 11B rotates via the connecting lever 18B, rod 20B, and bearing lever 19B, thereby causing the impression cylinder. 6 is attached to the blanket cylinder 4 via the substrate 7 and the driving of the motor 5 is switched.

  When the drive of the motor 5 is switched, the blanket cylinder 4 starts to rotate at a relatively high speed V1, and the impression cylinder 6 that is attached to the blanket cylinder 4 via the substrate 7 is the same by the rotation of the blanket cylinder 4. It rotates counterclockwise in the figure at a speed V1. Accordingly, the ink 2 is transferred from the blanket cylinder 4 to the substrate 7 as shown in FIG.

  As described above, since the blanket cylinder 4 is made of silicone having good releasability that easily releases ink, the ink is reliably transferred to the printing material 7. In addition, since the ink transfer time to the printing material 7 is shorter than the ink delivery time from the gravure cylinder 1 to the blanket cylinder 4, the shape of the ink transferred from the blanket cylinder 4 is maintained as it is. Since it is transferred to the printing material 7 as it is, high-definition printing becomes possible.

  As described above, since the time for transferring the ink 2 from the gravure cylinder 1 to the blanket cylinder 4 is relatively slow, the transfer time becomes longer. Therefore, the amount of ink that the blanket cylinder 4 receives from the gravure cylinder 1 is increased. be able to. For this reason, since a sufficient amount of ink can be reliably transferred from the blanket cylinder 4 to the substrate 7, the printing quality can be improved.

  In the present embodiment, the blanket cylinder 4 is driven by the motor 5, but it may be driven by a drive source of this machine that drives the printing machine. The blanket cylinder 4 has a diameter R2 that is twice the diameter R1 of the gravure plate cylinder 1, but may be an integer multiple of two.

  DESCRIPTION OF SYMBOLS 1 ... Gravure plate cylinder, 1a ... Concave part, 2 ... Ink, 3 ... Doctor blade, 4 ... Blanket cylinder, 5 ... Motor (driving means), 6 ... Impression cylinder, 7 ... To-be-printed material, 10A ... 1st cylinder attaching / detaching apparatus DESCRIPTION OF SYMBOLS 10B ... 2nd trunk | drum attaching / detaching apparatus, 11A, 11B ... Eccentric bearing, 14A, 14B ... Stepping motor.

Claims (4)

A gravure plate cylinder having a recess to be filled with ink on the peripheral surface, a blanket cylinder to which ink is transferred from the recess of the gravure plate cylinder, and a substrate to be printed is supplied between the blanket cylinder and the blanket cylinder. In a gravure offset printing press equipped with an impression cylinder
A first cylinder attaching / detaching device for removing the impression cylinder from the blanket cylinder when ink is transferred to the blanket cylinder;
A second cylinder attaching / detaching device for removing the gravure cylinder from the blanket cylinder when ink is transferred to the substrate;
Driving means such that the rotation speed of the blanket cylinder and the gravure plate cylinder when ink is transferred to the blanket cylinder is slower than the rotation speed of the blanket cylinder and impression cylinder when the ink is transferred to the printed material. When,
A gravure offset printing machine characterized by comprising: The impression cylinder is rotated by the rotation of the blanket cylinder when worn on the blanket cylinder by the first cylinder attachment / detachment device;
2. The gravure offset printing press according to claim 1, wherein the gravure printing cylinder is rotated by rotation of the blanket cylinder when the gravure printing cylinder is attached to the blanket cylinder by the second cylinder attaching / detaching device.   The gravure offset printing machine according to claim 1 or 2, wherein the diameter of the blanket cylinder is an integral multiple of 2 of the diameter of the gravure printing cylinder.   The gravure offset printing machine according to any one of claims 1 to 3, wherein the ink has conductivity.

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