JP5399341B2 - Plate adjustment method and plate adjustment apparatus for printing press - Google Patents

Description

  The present invention relates to a plate adjusting method and a plate adjusting device for a printing press that adjust the mounting position of a plate wound around a plate cylinder, and in particular, the plate is finely stopped while the printing press is temporarily stopped during a printing operation. The present invention relates to a printer to be adjusted.

  When printing is performed on the printing press, the sheet is transported while being squeezed between each cylinder such as an impression cylinder or a rubber cylinder of the printing press with the tip held between the cylinders. There may be a so-called fan-out phenomenon that gradually extends in the direction crossing the transport direction from the most downstream side in the transport direction to the most upstream side. This fan-out phenomenon tends to become more prominent (growth step by step) when printing is performed on a printing press provided with a plurality of printing units.

  For this fan-out phenomenon, an operation for adjusting the plate wound around the plate cylinder in a direction transverse to the conveying direction in accordance with the elongation of the paper so as not to shift the position of the printed image is known. For example, Patent Document 1 discloses the details thereof.

Japanese Utility Model Publication No. 1-76232

  This plate adjustment work is often performed during printing. That is, the worker who inspected the printing paper notices the fan-out phenomenon, pauses the operation of the printing press, performs plate adjustment work, and resumes printing. Therefore, a quick adjustment operation is required, and since ink is attached to the ink roller group, it is required that the ink is not attached to the plate during the adjustment operation. There was no description and there was room for improvement.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a plate adjusting method and a plate adjusting device for a printing press that can perform plate adjusting work quickly and easily.

  In order to achieve the above-mentioned object, the present invention has a plate cylinder that is rotatably provided in a printing machine and can wind a printing plate, and the plate cylinder has a plate tension state and a plate tension release state. In the plate adjustment method of a printing press in which the plate can be adjusted in the axial direction of the plate cylinder when the plate tension is released, when the plate is adjusted, the plate cylinder should first bring the plate into a release state. Located at the plate release position, then at the plate adjustment work position where the operator can easily adjust the plate, and after the plate adjustment by the operator, is positioned at the plate extension position to bring the plate into the plate tension state. It is characterized by.

  Further, the present invention has a plate cylinder that is rotatably provided in a printing press and can wind a printing plate, and the plate cylinder can switch the plate between a plate tension state and a plate tension release state. The plate cylinder is provided with an adjustment section in which the plate can be adjusted in the axial direction of the plate cylinder when the plate tension is released, and a plate adjustment apparatus for a printing press provided with a control section for controlling the rotation of the plate cylinder In the plate adjustment, the control unit first positions the plate cylinder at the plate tension release position, then positions the plate cylinder at the plate adjustment work position, and after the plate adjustment by the operator, the plate cylinder at the plate tension position. The trunk is located.

  According to the present invention, the rotation angle of the plate cylinder from the plate tension release position to the plate tension position via the plate adjustment work position is within 55 degrees.

  According to the plate adjustment method and plate adjustment apparatus of the printing press according to the present invention, at the time of plate adjustment, the plate cylinder is first positioned at the plate tension release position so as to bring the plate into the plate tension release state, and then the operator selects the plate tension. It is located at the plate adjustment work position where adjustment can be easily performed, and after the plate adjustment by the operator, it is located at the plate tension position so that the plate is put into the plate tension state. It is possible to obtain a printing plate adjustment method and plate adjustment device that can be performed with low possibility.

  Further, according to the printing method of the printing press according to the present invention, the rotation angle of the plate cylinder from the plate tension release position to the plate tension position via the plate adjustment work position is within 55 degrees. It is possible to obtain a plate adjusting device for a printing press, in which the possibility that the ink of the ink roller group adheres to the plate during operation is extremely low.

It is a schematic side view which shows an example of the printing machine of this invention, and shows a plate tension release position. It is a schematic plan view of a plate cylinder. It is EE sectional drawing of FIG. It is a schematic side view which shows the plate adjustment work position of a plate cylinder. It is a schematic side view which shows the plate tension position of a plate cylinder. It is a schematic block diagram which shows the structure of the control part of a printing press.

  Next, modes for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic side view showing an example of a printing press according to the present invention and showing a plate tension release position of a plate cylinder. FIG. 2 is a schematic plan view of the plate cylinder. 3 is a cross-sectional view taken along line EE in FIG. FIG. 4 is a schematic side view showing the plate adjustment work position of the plate cylinder. FIG. 5 is a schematic side view showing the plate tension position of the plate cylinder. FIG. 6 is a schematic block diagram showing the configuration of the control unit of the printing press. As shown in the schematic side view of FIG. 1, the printing press according to this embodiment is a sheet-fed offset printing press. This printing machine includes a paper feeding unit (not shown) for sending out a sheet as printing paper, a printing unit for printing on a sheet from the paper feeding unit, and a paper discharge unit. (Not shown). The specific configuration of each part constituting the printing press is not limited to that shown in the figure.

  The printing unit includes one or a plurality of printing units including a plate cylinder 1 and a rubber cylinder 3 around which a printing plate is wound, an ink roller group 5 partially illustrated, a pressure cylinder 7 and a transfer cylinder (not illustrated). The unit 9 is configured. A safety cover 11 that can be opened and closed is attached to the downstream side of the printing unit 9 in the transport direction, and maintenance of the plate cylinder 1 and the like can be performed by opening the safety cover 11. In addition, when the safety cover 11 is open, it is comprised so that a mechanical drive cannot be performed. Although not shown, each of the impression cylinder 7 and the transfer cylinder has two grippers (one or three or more) in the circumferential direction for gripping the fed sheet with the nail base and the nail. But may be).

  A notch provided in the plate cylinder 1 is provided with a tail-side clamp 13 and a tail edge-side clamp 15, and a plate (not shown) wound around the plate cylinder 1 by both clamps is used as the plate cylinder 1. Configured to install on.

  The tail edge side clamp 15 is configured to fix one end of a plate with a clamp base 17 and a clamp piece 19 rotatably provided on the clamp base 17. A recess 17a is formed on the bottom surface of the clamp base 17, and a cam shaft 21 is rotatably provided in the recess 17a. The clamp base 17 is always urged in the direction of arrow C in FIG. 3 by a spring (not shown).

  A rotating arm 23 is fixed to one end of the cam shaft 21. The rotating arm 23 is supported by rollers 23a and 23b at both ends thereof. In addition, an air cylinder 25 is provided below the plate cylinder 1 in the printing unit 9, and the rotating arm 23 is configured such that a rod 25 a that expands and contracts the air cylinder 25 contacts the rollers 23 a and 23 b of the rotating arm 23. The camshaft 21 is rotated by this rotation.

  The state shown in FIGS. 1 and 3 is a plate tension release state. That is, the curved surface portion 21a of the cam shaft 21 presses the left inner surface in FIG. 3 of the concave portion 17a of the clamp base 17, so that the clamp base 17 resists the biasing force of a spring (not shown) in the direction of arrow D in FIG. Moving. On the other hand, when the cam shaft 21 rotates approximately 90 degrees clockwise from the state of FIG. 3, the flat portion 21b of the cam shaft 21 faces the left inner surface. Then, the clamping base 17 is moved in the direction of arrow C in FIG. 3 by a biasing force of a spring (not shown) to be in a plate tension state (FIG. 5), and the plate is firmly fixed to the plate cylinder 1.

  In the state where the plate tension is released, plate position adjustment with respect to the plate cylinder 1, that is, plate adjustment work is possible. As shown, the tail edge side clamp 15 of the plate cylinder 1 is provided with an adjusting portion 27. The adjustment unit 27 has a hexagonal hole, and a hexagon wrench can be inserted into the hexagonal hole and rotated. An adjusting shaft 29 connected to the adjusting portion 27 by a worm gear is screwed into the clamp base 17. In FIG. 2, the clamp base 17 is provided as a pair on the left and right sides with the adjustment portion 27 as a boundary, and the screw provided on the adjustment shaft 29 screwed into the pair of left and right clamp bases 17 is a left and right reverse screw. . Therefore, when the hexagon wrench is inserted and rotated in the adjusting portion 27, the pair of left and right clamp bases 17 move away from each other or approach each other (for example, when the left clamp base 17 in FIG. The clamp base 17 moves in the direction of arrow B).

  FIG. 6 is a schematic block diagram showing the configuration of the control unit of the printing press according to the present invention. The printing machine motor 31 for driving the printing press, the air cylinder 25 described above, and the sheet fed from the paper feeding unit described above. A feed cylinder encoder 33 that generates a pulse signal representing rotation information (angle information) of the printing press, an operation unit 35 that can perform various operations of the printing press, and a control provided on the feed cylinder that receives and transfers to the impression cylinder 7 The unit 37 is configured. The control unit 37 includes a microprocessor 37a (which may be a sequencer) that performs arithmetic processing, a ROM 37b that stores data and a predetermined program (such as an arithmetic expression or a table), a RAM 37c that can store various information relating to the mechanical rotational speed, a micro It is configured using an interface 37d that mediates exchange of various signals between the processor 37a and a device provided outside the control unit 37.

  The operation of this embodiment will be described. If the worker who inspected the printing paper during printing notices the fan-out phenomenon, the worker temporarily stops the operation of the printing press. A long press (not less than 3 seconds) of a plate removal button (not shown) provided on the operation unit 35 is performed. Normally, when the plate release button is pressed shortly, the plate is discharged, but when the button is pressed long, the plate adjustment mode is performed in which the plate adjustment work is performed with the plate attached to the plate cylinder 1.

  When the plate release button is pressed for a long time, the plate cylinder 1 rotates in the counterclockwise direction in FIG. 1, which is the normal rotation direction, by inching operation (inching) and stops at the position shown in FIG. 3 is the same position). Then, the rod 25a of the air cylinder 25 moves forward as indicated by a two-dot chain line in FIG. 1 to press the roller 23b of the rotating arm 23, and the rotating arm 23 rotates to the position shown in FIGS. As a result, the camshaft 21 is also rotated and positioned at the position shown in FIG. The rod 25a of the air cylinder 25 moves backward immediately after rotating the rotating arm 23.

  Next, the plate cylinder 1 rotates by inching operation in the clockwise direction opposite to the normal rotation direction and stops at the position shown in FIG. This position is the plate adjustment work position, and the operator can perform the plate adjustment work by opening the safety cover 11 and inserting a hexagon wrench into the hexagon hole of the adjustment unit 27 as shown in FIG. The plate adjustment work position is configured to be a position where the operator can most easily perform the plate adjustment work.

  When the plate adjustment work is completed, the operator presses and holds a plate feed button (not shown) provided on the operation unit 35 (for 3 seconds or longer). Normally, when the plate feeding button is pressed briefly, the plate feeding mode for attaching the plate is entered. However, when the button is pressed long, the plate adjustment mode is not released. When the plate feed button is pressed for a long time, the plate cylinder 1 rotates in the counterclockwise direction which is the normal rotation direction by inching operation (inching), and stops at the position shown in FIG. Then, the rod 25a of the air cylinder 25 moves forward as indicated by a two-dot chain line in FIG. 5 to press the roller 23a of the rotating arm 23, and the rotating arm 23 rotates to the position of FIG. As a result, the camshaft 21 also rotates and enters a plate tension state. The rod 25a of the air cylinder 25 moves backward immediately after rotating the rotating arm 23.

  In the state of releasing the plate tension, since the attachment of the plate to the plate cylinder 1 is loosened slightly, there is a possibility that the plate may swell in the radial direction. Contact, and may adversely affect subsequent printing operations. Therefore, the rotation angle of the plate cylinder 1 from the plate tension release position shown in FIG. 1 to the plate tension position shown in FIG. 5 through the plate adjustment work position shown in FIG. It is configured to reduce the possibility of contact with the like. In this embodiment, the angle is 50 degrees (FIG. 5), but is preferably within 55 degrees.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention. For example, in the above-described embodiment, the air cylinder 25 is used. However, the present invention is not limited to this, and a hydraulic cylinder or the like may be used. In the embodiment described above, the sheet-fed offset printing machine is used. However, the present invention is not limited to this. If the printing machine is a type that rolls a plate around a plate cylinder, it is like a rotary paper printing machine. Also good.

  The plate adjusting method and plate adjusting apparatus for a printing press according to the present invention are extremely useful in a printing press requiring plate adjusting work.

  DESCRIPTION OF SYMBOLS 1 ... Plate cylinder, 3 ... Rubber cylinder, 5 ... Ink roller group, 7 ... Impression roller, 9 ... Printing unit, 11 ... Safety cover, 13 ... End side clamp, 15 ... End tail clamp, 17 ... Clamp base , 19: Clamp piece, 21 ... Cam shaft, 23 ... Rotating arm, 25 ... Air cylinder, 27 ... Adjustment unit, 29 ... Adjustment shaft, 31 ... Motor of this machine, 33 ... Feed cylinder encoder, 35 ... Operation unit, 37: Control unit.

Claims (3)

The printing press has a plate cylinder that is rotatably provided and can wind a printing plate. The plate cylinder can switch the plate between a plate tension state and a plate tension release state. In the plate adjustment method of a printing press in which the plate can be adjusted in the axial direction of the plate cylinder,
At the time of plate adjustment, the plate cylinder is first positioned at a plate tension release position so as to put the plate into a plate tension release state, and then positioned at a plate adjustment work position where an operator can easily perform plate adjustment. A plate adjustment method for a printing press, characterized in that after adjustment, the plate is located at a plate tension position so as to be in a plate tension state.
A printing cylinder provided rotatably in a printing press and capable of winding a printing plate, the printing drum being capable of switching the printing plate between a plate tension state and a plate tension release state. In the plate adjustment apparatus of a printing press provided with an adjustment unit capable of adjusting the plate in the axial direction of the plate cylinder in a state where the plate is released, and provided with a control unit for controlling the rotation of the plate cylinder,
During plate adjustment, the control unit first positions the plate cylinder at a plate tension release position, then positions the plate cylinder at a plate adjustment work position, and after the plate adjustment by an operator, places the plate cylinder at a plate tension position. A plate adjusting device for a printing press characterized by being positioned.
  3. The plate adjusting device for a printing press according to claim 2, wherein the rotation angle of the plate cylinder from the plate tension release position to the plate tension position via the plate adjustment work position is within 55 degrees.

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