JPH0788091B2 - Automatic plate change control device for sheet-fed offset printing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic plate change control device for automatically changing plates in a plate cylinder of a sheet-fed offset printing press.

[Conventional technology]

FIG. 7 shows a schematic configuration of a 4-color sheet-fed offset printing machine. In the figure, it is composed of printing units 1 to 4 for each color unit, a paper feed unit 5, a paper discharge unit 6, a drive unit 7, a control unit 8 and an operation panel 9. The drive unit 7 has a main motor 7a and a slow-moving motor 7b. Plate cylinder 1 for each printing unit 1 to 4
0, a blanket cylinder 11, an impression cylinder 12 and an intermediate cylinder 13 are provided. Plate cylinder 10, blanket cylinder 11, impression cylinder 12, intermediate cylinder 13 and output cylinder
The cylinders 14 are rotated by the drive unit 7 in synchronization with each other.

FIG. 8 is a detailed view of the printing unit. In the figure, 16 is the version, 16
a is the plate bite side, 16b is the plate butt side, 17a is the bite side vise, 17b is the butt side vise, and 15 is the printing paper. In FIG. 7, the printing paper 15a deposited on the paper feeding unit 5 is printed up while passing through the printing units 1 to 4, and is deposited as printed paper 15b on the paper ejection unit 6. When switching to a new print after printing,
4. Replace plate 16 mounted on plate cylinder 10 of 4. The replacement work of this version is performed as follows.

(1) The worker enters each printing unit, for example, between 1 and 2, and rotates the plate cylinder 10 by the loosening motor 7b, and the bite side vise 17a.
So that the buttocks vise 17b is in a position where the operator can remove the plate. When the plate cylinder 10 stands still, the vise 17a, 17b which fixes the plate 16 is operated to loosen the fixing and removed from the plate cylinder 10.

(2) Next, the operator prepares a new plate 16 and rotates the plate cylinder 10 by the loosening motor 7b so that the vise 17a and 17b can attach the plates to a cheap position. Stop plate cylinder 10 and vise plate 16
Plate fixed to 17a and bited by vise 17a while rotating plate cylinder 10
While pulling 16 by hand so that it fits in the plate cylinder 10, use a vise 17b
Fix at. Next, the vise 17b is pulled with a bolt or the like to stretch the plate.

(3) The series of rotations of the plate cylinder 10 described in (1 and 2) above requires both forward rotation and reverse rotation, and is performed manually by a push button switch.

(4) The above series of operations are repeated for the plurality of printing units 1 to 4, and the exchange of the plate 16 is completed.

[Problems to be solved by the invention]

(1) When mounting and removing the plate, it takes time and effort to determine the convenient position by rotating the slow-moving motor forward and backward. If this is automated, positioning can be performed at a speed several times faster than the speed of the loose motor, resulting in improved efficiency. (A slow-moving slow-moving motor is used for manual work.) (2) Since the plate is clamped and released manually, the number of printing units is large in a multicolor machine, and the plate is attached / detached. It has to be done by the number of copies.

(3) When attaching the plate to the plate cylinder, after biting the plate with a vise,
While rotating the plate cylinder, the plate butt must be pulled by hand in order to bring the plate into close contact with the plate cylinder.

(4) After mounting the plate on the plate cylinder, a vise must be manually pulled in order to stretch the plate.

Since all the operations are manual as described above, when mounting the plate,
It may damage the plate, is time-consuming, requires skill, and requires human resources. This tendency becomes even more prominent when the printing press becomes large and the plate becomes large accordingly.

[Means for solving problems]

A vise opening and closing mechanism that tightens or releases the vise that bites the plate and fixes it to the plate cylinder surface, a plate tensioning mechanism that tensions or loosens the plate that has been bitten by the vise against the plate cylinder surface, and a plate cylinder In a sheet-fed offset printing press equipped with an AC servomotor that performs fixed position stop and rotation during plate attachment / detachment, a control circuit that controls the operation of the vise opening / closing mechanism, and a control circuit that controls the operation of the plate tensioning mechanism, It is characterized in that it is provided with a control device for an automatic plate exchange, which incorporates a circuit for controlling the rotation of an AC servo motor.

[Action]

(1) The mounting and demounting of the plate by the vise of the plate cylinder and the tension or looseness of the plate between the plate and the plate cylinder are automated.

(2) It is possible to control the fixed stop of the plate cylinder when the plate is attached and detached, and the plate cylinder can be easily stopped at a position convenient for attaching and detaching the plate.

(3) The plate can be brought into close contact with the plate cylinder.

〔Example〕

 An embodiment of the present invention will be described with reference to FIGS.

The vise opening / closing mechanism of the plate cylinder is, for example, as shown in FIG.
A fork 34 which is connected to a rocking air cylinder 32 on the side of the fork and rocks and slides, and a plate cylinder 10 for engaging and disengaging from the fork 34.
And a roller 42 on a trailing cam shaft 40 also provided on the plate cylinder 10. More specifically, the swing air cylinder 32 is swingably supported around a fulcrum A, a fork 34 is attached to the piston rod 32a, and an air cylinder 31 is attached to the base of the fork 34, and the air cylinder 31 operates. The rocking air cylinder 32
Swings to the standby position a, the bite side vise operating position b, and the rear side vise operating position c, and the fork 34 moves in the retracted position ad and the advanced position when the piston shaft 32a enters and exits at the standby position a. ae, and at the retracted position ad, waits above the position where the upper teeth of the vise side vise 17a or the butt side vise 17b are open, and also the entry side of the piston shaft 32a at the bite side vise operation position b. And the exit side, the fork 34 moves to the retracted position bd and the advanced position be,
In be, it fits into the roller 39 on the swing arm 38 fixed to the bite cam shaft 37 that opens and closes the upper teeth of the bite side vise 17a, and when the upper teeth are opened to the forward position be, the roller 39 is moved to the air cylinder 32 side. The retractable swing arm 38 is moved to rotate the bite cam shaft 37, and the upper teeth bite and fix the closing plate 16, and the upper teeth are opened by the reverse operation of this sequence. The fork 34 moves to the retracted position cd and the forward position ce at the inlet side and the outlet side of the piston shaft 32a at c, and at the forward position ce the rear side vise.
17b Fits into the roller 42 attached to the swing arm 41 fixed to the rear cam shaft 40 that opens and closes the upper tooth, opens the upper tooth, and when the retracted position cd is reached, pulls the roller 42 toward the air cylinder 32 side.
Since the swinging arm 41 is moved and the tail cam shaft 40 is rotated, the upper teeth are closed, the plate 16 is bitten and fixed, and the upper teeth are opened by the reverse operation.

Further, on the side of the plate cylinder 10, a familiar roller 35 for pushing the plate 16 is provided, and the familiar roller 35 is air-supported by a support base 43 which is screwed to a screw shaft 44 which interlocks with a reversible motor 36. It is attached to the piston shaft of the cylinder 33 via a lever, moves to the retracted position g and the advanced position f on the inlet side and the outlet side of the piston shaft, and the familiar roller 35 makes the plate 16 adhere to the plate cylinder 10 at the advanced position f. In the retracted position g, the familiar roller 35 is separated from the plate 16 and the support base 43 is in the operating position shown in FIG. 4 when the plate is mounted by the reversible motor 36, and the rest is in the non-operating position. Away from 10. In the figure, 57 to 63 indicate limit switches for each air cylinder.

The plate tensioning mechanism of the plate cylinder 10 comprises a kicker 22 operated by a rotary actuator 21, as shown in FIGS. 5 and 6.
When the kicker 22 is projected to the position shown in the figure by the operation of the rotary actuator 21, the plate cylinder 10 is rotated to perform automatic plate tensioning or loosening. When the rotary actuator 21 rotates 90 ° in the direction perpendicular to the paper surface with respect to the above-mentioned position, the kicker 22 is retracted and the automatic tensioning or loosening action is not performed.

The control device 51 for automatic plate replacement shown in FIG. 2 has a built-in circuit for controlling the rotation of the rotary actuator 21.

As shown in FIG. 2, the controller 51 includes a main controller 52.
(Sequencer) and AC servo motor controller 53.
Each of the printing units 1 to 4 has an operation panel 54 and an air cylinder control circuit 55 for controlling the operation of the air cylinders 31, 32, 33, and an absolute type rotary encoder at the shaft end of the plate cylinder 10 for the final color. One 56 is attached. Operation board
There are 5 pushbuttons on 54, namely, for automatic plate release, plate release preparation 54a and plate removal start 54b, for automatic plate attachment,
Pushbuttons for plate making preparation 54c, plate biting start 54d, and plate winding start 54e are provided.

As shown in FIG. 4, each air cylinder 31, 32 and 33
The limit switch is actuated by the piston position of each cylinder to send a signal to the main controller 52 (Fig. 2) when the limit switch is reached. In addition, the reversible motor 36
Is also in contact with the main controller 52. Instead of the slow-moving motor 7b (FIG. 7) described in the prior art, an AC servo motor 64 is installed as shown in FIG.
It is connected to the AC servo motor control circuit 53. AC servo motor 64 has a slow speed three times faster than the conventional one (as an example).
It is possible to obtain two rotation speeds, which are the plate mounting and demounting speed. The operation panel 54, the air cylinder control circuit 55, and the absolute type rotary encoder 56 are also connected to the main controller 52 of the controller 51. Air cylinder controller
Reference numeral 55 is for actuating a solenoid valve (not shown) that controls the flow of air into and out of each air cylinder 31, 32 and 33.

The attachment / detachment control of the plate 16 will be described with reference to the flowcharts of FIGS. 1A, 1B, and 1C.

As shown in FIG. 1A, step 101 starts plate removal. Next, in step 102, the push button 54a for preparing for plate removal of the operation panel 54 is pressed first. The kicker is activated by the operation of the rotary actuator 21 of the plate tensioning mechanism (see Figs. 5 and 6).
22 overhangs and loosens plate 16. Next, by the process of the positioning flowchart (FIG. 1C) (described later), the plate cylinder 10
The rear side vise 17b comes to the take-out position, and the plate cylinder 10 stops. Then, the air cylinder 32 of the vise opening / closing mechanism (see FIG. 4) takes the forward position ce, and the upper teeth of the rear side vise 17b open (the above is automatic). At step 103, the bottom side of the plate 16 is grasped by hand. Next, in step 104, the plate removal start button 54b is pressed. The air cylinder 32 takes the retracted position cd and closes the upper teeth of the rear side vise 17b. The plate cylinder 10 is reversed and when the bite-side vise 17a is in the removal position (due to the process of Figure 1C), the plate cylinder 10 stops. Next is the air cylinder
32 takes the position of the forward position be, and the upper teeth of the vise side vise 17a open (above automatic). Here, the plate 16 is removed by step 105. Approximately 2 seconds after the upper teeth of the bite-side vise 17a are opened, the air cylinder 32 automatically comes to the retracted position bd, and the upper teeth of the bite-side vise 17a are closed. This completes the removal in step 106.

As shown in FIG. 1B, step 201 starts plate mounting. Next, in step 202, the push button 54c for preparing the printing plate of the operation panel 54 is pressed first. The plate cylinder 10 rotates forward, and when the bite-side vise 17a comes to the mounting position (by the process of FIG. 1C), the plate cylinder 10 stops. Next, the air cylinder 32 takes the advanced position be (FIG. 3), and the upper teeth of the bite-side vise 17a are opened (the above is automatic). Here by step 203 by hand plate 16
Is inserted into the vise side vise 17a. Next, in step 204, the push button 54d for starting the plate bite is pushed. The air cylinder 32 takes the retracted position bd, and the upper teeth of the bite-side vise 17a are closed. The familiar roller 35 ascends together with the support base 43 to the operating position (4th
Figure). Then, when the plate winding start push button 54e is pressed in step 205, the plate cylinder 10 rotates in the forward direction and the conforming roller 35 advances to press the plate 16 against the plate cylinder 10 and bring them into close contact (cylinder insertion state). When further rotating in this state and the rear side vise 17b of the plate cylinder 10 comes to the plate mounting position by the process of FIG. 1C, the plate cylinder 1
0 stops. Next, the air cylinder 32 comes to the advance position ce, and the upper teeth of the rear side vise 17b open. Further, the familiar roller 35 moves up to the butt side vise 17b, the butt side of the plate 16 is inserted into the vise, and after a while, the upper teeth of the butt side vise 17b are closed (because the air cylinder 32 comes to the cd position). , Familiar roller 35
Takes the entrance side position g by the air cylinder 33, moves away from the plate 16, and returns to the lower inoperative state by the reversible motor 36. Further, in parallel with the operation of the familiar roller 35 returning to the inoperative state, the plate tensioning mechanism (FIGS. 5 and 6) operates the rotary actuator 21 and the kicker 22 to tension the plate 16 (the above is automatic). This completes the plate mounting in step 206.

FIG. 1C shows a flow chart of the positioning process.
Positioning is started in step 301 by pressing the push-button 54a or the plate-preparation 54c push button. In step 302, the current stop position of the plate cylinder 10 is input from the absolute rotary encoder 56. Let that position be a at the rotation angle from the reference axis. Next, in step 303, the target position (mounting or removing position of the plate) is determined. This target position is b. Then, the movement amount is calculated in step 304. (Movement amount c = ba) Next, in step 305, the rotation amount d of the AC servo motor 64 is calculated. When K is the reduction ratio from the AC servo motor 64 to the plate cylinder 10, d = K · c. In step 306, the AC servomotor 64 is driven by the amount d, and the plate cylinder is stopped at the target position. In step 307, positioning is completed.

Although the above embodiment shows a method of replacing a single color,
Similarly, it is possible to control the exchange of a plurality of colors in parallel. Although not shown in the embodiment, a warning mechanism and a display mechanism for notifying an abnormal place when an abnormality occurs during automatic operation and their control circuits are provided.

〔The invention's effect〕

Thus, according to the present invention, a vise opening / closing mechanism for tightening or opening the vise that bites the plate and fixes it to the plate cylinder surface, and the plate bitten by the vise is tensioned or loosened with respect to the plate cylinder surface. In a sheet-fed offset printing machine equipped with a plate tensioning mechanism and an AC servomotor that stops the plate cylinder at a fixed position and rotates when the plate is attached or detached, a control circuit for controlling the operation of the vise opening / closing mechanism and the plate tensioning mechanism Since a control device for the automatic plate changer that has a built-in control circuit for controlling the operation and a circuit for controlling the rotation of the AC servomotor is provided, it is possible to stop the plate cylinder at a fixed position during plate change and to remove the plate. Since operations such as opening and closing of force and plate tension on the plate cylinder can be performed automatically, labor saving and non-skilling can be achieved, and by using the AC servo motor, the rotation speed for plate replacement can be slowed down to the conventional speed. Shorter time because it can be faster than the speed of the dynamic motor To be further since it is possible to tension the plate automatically, it is not necessary to pull the plate by hand, has the effect of such may be omitted manpower necessary for this.

[Brief description of drawings]

1A, 1B and 1C show a flow chart of a plate removing, plate mounting and positioning process in an embodiment of an automatic plate changing control device of a sheet-fed offset printing machine of the present invention.
FIG. 2 is an explanatory view diagrammatically showing the control device of the present invention, FIG. 3 is a view taken in the direction of the arrow X in FIG. 2, FIG. 4 is a side view of the vise opening / closing mechanism, FIGS. 5 and 6. The figure shows a side view and a plan view of the plate tensioning mechanism. FIG. 7 is a configuration diagram of a four-color sheet-fed offset printing machine, and FIG. 8 is a detailed diagram centering on the plate cylinder of the printing unit in FIG. 51 ... Control device, 52 ... Main control device 53 ... AC servo motor control device, 54 ... Operation panel 55 ... Air cylinder control circuit, 56 ... Absolute rotary encoder 57 to 63 ... Limit switch, 64 ... AC servo motor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiro Matsuura 5007 Itozaki-cho, Mihara-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Mihara Manufacturing Co., Ltd. (56) References JP-A-59-104941 (JP, A) JP-A-61- 182952 (JP, A) JP 58-78769 (JP, A) Actual development 61-112929 (JP, U)

Claims (1)

[Claims] 1. A vise opening / closing mechanism for tightening or releasing a vise that bites a plate and fixes it on the plate cylinder surface, and a plate tensioning mechanism for tensioning or loosening the plate bitten by the vise against the plate cylinder surface. In a sheet-fed offset printing press equipped with an AC servomotor that stops the plate cylinder at a fixed position and rotates when the plate is attached or detached, the control circuit that controls the operation of the vise opening / closing mechanism and the operation of the plate tensioning mechanism are controlled. An automatic plate exchange control device for a sheet-fed offset printing press, which is provided with a control circuit for controlling the rotation of an AC servomotor and a control circuit for controlling the rotation of an AC servomotor.