JP3220910B2 - Plate changing device for rotary printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing plate changing apparatus for removing an old plate mounted on a plate cylinder and mounting a new plate in a rotary printing press.

[0002]

2. Description of the Related Art In various rotary printing presses, a winding rod hole having a circular cross section which is partially open to the peripheral surface of a plate cylinder extends in the axial direction of the plate cylinder. A plate winding rod is fitted in the rod hole. When a printing plate (hereinafter, referred to as a plate) is mounted on the peripheral surface of the plate cylinder, the plate cylinder is rotated by approximately one turn after inserting the edge of the plate into the holding portion of the plate winding bar. The plate is wound around the peripheral surface of the plate cylinder, the end of the plate side is held by the holding portion of the plate winding bar, and the plate winding bar is rotated while the reverse rotation of the plate winding bar is regulated by a ratchet device or the like. The method has been adopted. When the plate mounted on the plate cylinder is to be removed, the plate is rewound from the peripheral surface of the plate cylinder by removing the tail end from the holding portion of the plate winding bar and then rotating the plate cylinder approximately one turn. In this method, the edge of the plate on the grip side is removed from the holding portion of the plate winding rod.

For example, Japanese Patent Laying-Open No. 2-103145 discloses a device which is controlled so that the plate cylinders of all units are positioned at a position convenient for performing this plate exchange. For example, the plate is detached and mounted in a four-color printing press according to the following order. That is, when removing the old plate of the four-color printing press, the plate cylinder of the printing unit for the first color is positioned at the plate bottom discharge position. Therefore, the operator prepares the plate discharge such as taking out the plate bottom from the first color plate cylinder in order, and then operates the push buttons and the like. Since the rotation of the plate cylinder stops at the position where the gripping side discharge position is opposed, the worker located in the printing unit for the fourth color removes the gripping side of the plate in order from the fourth color to the first color to discharge the old plate. Is completed.

After all the old printing plates are removed in this manner, the plate cylinders of all the printing units are simultaneously rotated by a push button operation or the like so that the plate holding side insertion position is opposed to the worker, and the worker presses the first color. After inserting the sides of the plate in order from the plate cylinder, all the plate cylinders are simultaneously rotated by a push button operation, etc., and then the operator inserts the plate bottom in order from the fourth color to the first color, and Installation is completed.

[0005]

As described above, in the conventional plate changing method and apparatus, for example, in the case of a four-color printing press, an operator needs to move between the first color printing unit and the fourth color printing unit. I have to go back and forth many times,
The burden on the worker is extremely large. Further, since the harmonic drive is used for positioning, there is a problem that backlash is large and it is difficult to perform accurate positioning.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a printing plate changing method for a rotary printing press, which makes it possible to easily change a printing plate in a short time without imposing a burden on an operator. And devices.

[0007]

In order to achieve the above object, according to the present invention, a motor is supported on a line shaft provided along a base and connected to a driving motor via a driving clutch. A drive shaft, a drive shaft connected to the drive shaft, and a single motor provided for each printing unit, and an intermediate shaft connected via a single drive side clutch; and drive connection between the intermediate shaft and the plate cylinder. A gear device is provided to replace the plate.
The driving-side clutch is disconnected and the single-drive-side clutch is connected, switching to rotation driving of the plate cylinder by the single motor is performed, and the removal of the old plate and the installation of the new plate are performed continuously for each printing unit. During the printing operation, the driving-side clutch is connected, the single-drive-side clutch is disconnected, and the drive is switched to the rotation driving of the plate cylinder by the driving-side motor.

[0008]

[Function] When replacing a printing plate, the rotation of the plate cylinder in each printing unit is switched from the driving motor to the individual motor of each printing unit, and the removal of the old plate and the installation of the new plate are continuously performed for each printing unit. And then move to the next printing unit after the new version has been installed.

That is, the driving side clutch on the line shaft is disconnected, the clutch on the independent motor side is connected, and the plate cylinder is rotationally driven to change the printing plate.

[0010]

1 to 21 show an embodiment in which a plate changing apparatus for a rotary printing press according to the present invention is applied to a double-sided web rotary printing press. FIG. 1 is a side view of a plate cylinder, and FIG. FIG. 3 is a partially exploded front view of the plate winding driving unit, FIG. 4 is a side view of the plate winding driving unit, FIG. 5 is a front view of the plate pressing unit, and FIG. 6 is a plate holding unit. 7 is a cross-sectional view of the printing unit single drive unit, FIG. 8 is an exploded plan view of the printing unit single drive unit, FIG. 9 is a schematic plan view of the printing unit, and FIG. 10 is a schematic front view of the printing unit. 11 to 15 are front views showing the vicinity of a plate winding bar for explaining the plate winding operation, and FIGS. 16 to 18 are side views showing the vicinity of a plate drum end for explaining the plate winding operation. FIG. 21 to FIG. 21 are flowcharts of the plate exchange operation.

8 to 10, a blanket cylinder 4 of an upper printing device 3 is provided between the left and right frames 2 of the printing unit 1.
And a blanket cylinder 6 of the lower printing apparatus 5 are mounted on a shaft in contact with each other, and plate cylinders 7 and 8 supported by left and right frames 2 are respectively in contact with the blanket cylinders 4 and 6. A printing plate (hereinafter, referred to as a plate) is mounted on a peripheral surface of each of the plate cylinders 7, 8 by a printing plate changing device (described later) according to the present invention. Since the lower printing device 5 has almost the same configuration as the upper printing device 3, only the upper printing device 3 will be described below. A plurality of inking rollers 9 of the inking device shown in FIG. 6 are in contact with the surface of the plate mounted on the plate cylinder 7, and a swimsuit roller 10 of a water supply device is in contact with the surface of the plate. ing. Then, the image formed on the plate surface by the ink and water supplied to the plate surface by the ink device and the water supply device, only a part of which is illustrated, is transferred to the blanket cylinders 4 and 6, and FIG.
Is transferred to the web 11 running in the direction indicated by the arrow and subjected to double-sided printing. Reference numeral 12 denotes a step which is supported between adjacent printing units and stands by a worker at the time of plate exchange or ink change, and the like.
9 and a cylinder gear for transmitting to the plate cylinders 6, 7 and the like.

In FIGS. 1 and 2, disc-shaped bearers 7a are integrally formed at both ends of the plate cylinder 7, and a winding rod hole 7c is formed at an outer peripheral portion between the bearer 7a and the barrel main body 7b. It is provided through the entire length of the torso. Into the winding rod hole 7c, a plate winding rod 15 having a cross section of a perfect circle longer than the body length is rotatably fitted.
The movement in the axial direction is restricted by bringing the step into contact with the bush 16 fitted to the corresponding portion a. A protruding portion 15a of the plate winding bar 15 toward the machine operation side is formed in a hexagonal cross section.
The square holes are fitted and fixed by splitting.

An L-shaped bracket 18 is bolted to the end surface of the bearer 7a in the vicinity of the lever 17 and has a forked portion formed at the free end of the lever 17. A flanged spring shaft 19 is swingably pivotally mounted by a pin 20, and the spring shaft 19 is slidably fitted in a hole formed in the spring receiver 21 and the bracket 18. . Reference numeral 22 denotes a flange of the spring shaft 19 and the spring receiver 21.
And a compression coil spring interposed between the lever 1 and the lever 1
7, a counterclockwise turning force in FIG. 1 is applied to the plate winding bar 15. As shown in FIG. 11, the plate winding rod 15 has a groove 15b extending in the radial direction and opening on the peripheral surface.
Are provided over the entire length of the plate winding rod 15, and into this groove 15b, a plurality of leaf springs 23 formed in a substantially U-shape with a small width used for plate winding described later are press-fitted. The plate winding rod 15 is stopped in a state where the spring forces of the compression coil spring 22 and the leaf spring 23 are balanced. In addition,
A notch 7d corresponding to the winding rod hole 7c is provided on the peripheral surface of the plate cylinder 7 so as to open to the peripheral surface.

3 and 4, the plate cylinder 7 is supported by the frame 2 via a bearing 24. Above the bearing 24, a pin 25 with a flange is screwed into a screw hole of the frame 2 through a screw hole. The lever 25 formed in a U-shape is rotatably supported on the pin 25 while being prevented from coming off from the pin 25 by a bush 27. A cam lever 28 is fixedly fastened to the projecting portion 15a of the plate winding bar 15, and a cam follower 29 pivotally attached to a central portion of the lever 26 is brought into contact with a free end portion 28a of the cam lever 28. I have.

On the other hand, an air cylinder 31 is pivotally supported by a pin 30 implanted in the frame 2 so as to be swingable, and an operating end of a piston rod 32 which advances and retreats by the air pressure, and a stud 33 on the frame 3 side. Link 3 to be pivoted to
4 is connected to one free end by a link 35 pivotally connected at both ends by pins. The lever 26 and the other free end of the link 34 are connected to each other by a link 36 pivotally connected at both ends by pins. A spring hook 37 provided at one end of the link 35 and a spring A tension coil spring 39 for applying a rotating force to rotate the lever 26 to the solid line position in FIG. The tension coil spring 39 is provided for safety so that the lever 26 does not rotate to the dashed line position in FIG. 4 at the time of a power failure or the like. 3
Reference numeral 5a denotes a stopper fixed to the frame 2 to abut the link 35 and regulate the end of its movement in the direction indicated by the chain line.

In FIGS. 5 and 6, near the peripheral surface of the plate cylinder 7, there are provided substantially rectangular sub-frames 41 supported by a plurality of posts 40 inside the frames 2 on both sides. The working end of the piston rod 43 of the air cylinder 42 fixed to the sub-frame 41 is connected to a lever 44 which is orthogonal to the piston rod 43 and extends substantially toward the axis of the blanket cylinder 4. Reference numeral 45 denotes a slide shaft having both ends supported by a bracket 46 on the sub-frame 41 side and extending in a direction perpendicular to the lever 44. The lever 44 is slidably fitted to the slide shaft 45, and the piston is operated by air pressure. By moving the rod 43 forward and backward, the lever 44
Is guided by the slide shaft 45 and moves forward and backward with respect to the peripheral surface of the plate cylinder 7. Bearings 47 are mounted on the distal ends of the levers 44 on both sides, and plate holding rollers 48 extending in the axial direction of the plate cylinder 7 are rotatably supported on both ends of the bearings 47 on both sides. . The plate pressing roller 48 is configured to be pressed against the plate surface on the plate cylinder 7 by moving forward.

Further, the lever 44 has an air cylinder 42
Another air cylinder 49 that moves forward and backward is fixed with its axial direction parallel to the air cylinder 42, and the working end of the piston rod 50 that moves forward and backward by the air pressure of the air cylinder 49 is formed of an elastic material such as rubber. A pad 51 extending in the axial direction of the plate pressing roller 48 is provided to be supported by a bar 52. The end shaft of the bar 52 has a lever 5 whose base is swingably mounted on the end shaft of the plate pressing roller 48.
When the piston rod 50 is moved forward, the lever 53 swings around the end axis of the plate holding roller 48, and the pad 51 at the free end of the lever 53 rotates. It is configured to be pressed against the butt of the plate from the radial direction. That is, the plate pressing roller 4 is moved by the air cylinder 42.
When the piston rod 50 of the air cylinder 49 moves forward while the pressurizing member 8 advances and is pressed against the plate surface, the pad 51 circulates and the pressing position of the plate pressing roller 48 is shifted in phase in the circumferential direction of the plate cylinder 7. It is configured to be pressed against the wrong part of the plate.

Here, the configuration of the printing unit driving section will be described with reference to FIG. In a gear box 54 provided on the driving side of the printing unit, a line shaft 55 that is driven to rotate from the driving side and extends along the machine base, and an intermediate shaft 56 parallel to the line shaft 55 are drivingly connected by gears 57 and 58. An electromagnetic clutch 59 is interposed between the gear 57 and the line shaft 55 to be connected or disconnected by a signal from a control device or a push button operation. The intermediate shaft 56 and a gear shaft 60 orthogonal to the intermediate shaft 56 are drivingly connected by bevel gears 61 and 62, and the gear shaft 60 and the blanket cylinder 4 are drivingly connected by gears 63 and 64.

Further, a single motor 65 is mounted on the gear box 54, and a clutch 66 is provided on the intermediate shaft 56 for connecting and disconnecting rotation transmission between the single motor 65 and the intermediate shaft 56. That is, the intermediate shaft 56 is rotationally driven from the driving side by the electromagnetic clutch 59 being connected and the clutch 66 being disconnected during the printing operation. When the plate is replaced, the electromagnetic clutch 59 is disconnected and the clutch 6
6 is connected so as to be driven to rotate from the single motor 65 side. In FIG. 8, a rotary encoder 67 is mounted on an end shaft on the side opposite to the gear of the upper blanket cylinder 4, and is configured to detect a stop position of the plate cylinder 7.

In FIG. 10, operation panels 70 and 71 are attached to the upper printing device 3 and the lower printing device 5, respectively, and are fixed to the work space side of the frame 2. Are provided with push buttons for operating the above-described devices. Each printing unit 1 is provided with a dedicated sequencer.

The operation of the printing plate changing apparatus constructed as described above will be described with reference to FIGS.
21 will be described together with the flowchart of FIG. A leaf spring 23 is press-fitted into the groove 15b of the plate winding bar 15,
The old version 81 is mounted in the same state as the new version 80 shown in FIG. That is, the grip-side end 81a of the old plate 81 bent by a plate bending machine (not shown) is inserted from the cut 7d of the plate cylinder 7 and pressed and held on one end of the leaf spring 23 on the wall surface. The rear end 81b of the old plate 81 bent approximately at right angle by the bending machine has a bent end 81c.
Is held in a state where it is hooked on the bent portion at the other end of the leaf spring 23.

With the old plate 80 mounted in this way, press the plate change mode button of the operation stand to make the motor in a safe state in which the driving motor does not rotate, and then press the unit select button to select the selected printing. The driving side electromagnetic clutch 59 of the upper printing device 3 of the unit 1
(Unit clutch) is disconnected, the independent drive side clutch 66 (make ready clutch) is connected,
The ink clutch (not shown) is disengaged, and the top, right, left, and twist print registration devices return to the zero position. Since the single motor 65 rotates in this state, the plate cylinder 7 rotates to the position shown in FIG. 12 and stops.

In this state, when the ready and operation button is pressed, the air cylinder 31 is operated, and as shown in FIG.
The cam follower 29 pivotally attached to the cam lever 6 allows the cam lever 28 to play.
The plate winding rod 15 is rotated by pushing the end 28a, and the bent portion of the leaf spring 23 releases the holding of the old plate 81 as shown in FIG. Go outside. Then, when the plate bottom is held by hand and the prime mover preparation and operation button is pressed, the plate cylinder 7 is reversed and the old plate 81 is rewound and stopped at the position shown in FIG.

Then, when the user presses the operation button, the air cylinder 31 is actuated, and the cam follower 29 pivotally attached to the lever 26 pushes the cam lever 28 to move the plate winding bar 15 in FIG.
Is stopped by rotating to the position shown in FIG. 7, and the holding side end of the old plate 81 is released from the holding by the leaf spring 23 and the holding side end comes out of the plate cylinder 7, so that the removal of the old plate 81 is completed. .

In this state, the edge of the new edition 80 on the grip side
80a prepared by inserting into the groove of the plate cylinder 4, as shown in FIG. 12, pressing the operating button, the cam follower 29 to the air cylinder 31 is pivotally connected to the lever 26 by actuation of the free end portion 28a of the cam lever 28 Release the pressure and press the compression coil spring 2
Since the plate winding bar 15 is rotated to the position shown in FIG. 13 and stopped by the spring force of 2, the gripping side end 80 a of the new plate 80 is held by the leaf spring 23. Then, when the user presses the preparation and operation button, the plate cylinder 7 rotates forward and the new plate 80 is wound around the peripheral surface of the plate cylinder 7, and the plate cylinder 7 stops at the position shown in FIG.
When the new plate 80 is wound around the peripheral surface of the plate cylinder 7, the air cylinder 42 is operated, the piston rod 43 advances, and the lever 44 is guided by the slide shaft 45 with the pad 51 and moves. The plate holding roller 48 is pressed against the surface of the new plate 80, and the new plate 80 is wound in this state, so that the new plate 80 is wound in a state in which the new plate 80 is in close contact with the body peripheral surface.

The plate when the rotation of the cylinder 7 is stopped, the piston rod 50 by the air cylinder 42 is actuated to advance, the lever 53 is <br/> swings around the end shaft of the plate press roller 48 The pad 51 fixed to the free end of the lever rotates around,
Since the butt-side bent portion of the new plate 80 is pressed from the radial direction, the butt-side bent portion of the new plate 80 is inserted into the opening end of the leaf spring 23. At this time, the air roll 42 is used by the air cylinder 42.
15, the rear end 80b of the new plate 80 is held with the bent end 80c hooked on the bent portion of the leaf spring 23, and the mounting of the new plate 80 is completed. Thereafter, the plate exchange of the lower printing device 5 and the plate exchange of the other printing units are performed in the same manner as described above, and after the clutch is switched, the plate exchange mode button is released. It is.

[0027]

As is apparent from the above description, according to the present invention, the plate changing device of the rotary printing press is supported on a line shaft erected along the base and provided between the driving motor and the motor. A drive gear connected via a driving-side clutch, an intermediate shaft which is connected via a single drive-side clutch between the drive gear and a single motor which is drivingly connected and provided for each printing unit, and A gear device for driving and connecting the plate cylinder is provided, and when the printing plate is replaced, the driving side clutch is disconnected and the single drive side clutch is connected, switching to rotation driving of the plate cylinder by the single motor is performed, and the old plate is removed. And a new plate are continuously mounted for each printing unit. During the printing operation, the driving-side clutch is connected, the single-drive-side clutch is disconnected, and the driving motor rotates the plate cylinder. By being configured to switch to, the movement amount of the worker during plate changing is greatly reduced than the conventional burden of labor is reduced. In addition, the configuration having the clutch enables high-precision positioning and improves the quality of printed matter. Further, the return time after the plate changing operation is shortened, and the operation rate of the machine is improved.

[Brief description of the drawings]

FIG. 1 is a side view of a plate cylinder.

FIG. 2 is a partially cutaway front view of a plate cylinder end.

FIG. 3 is a partially exploded front view of the plate winding drive unit.

FIG. 4 is a side view of a plate winding drive unit.

FIG. 5 is a front view of a plate holder.

FIG. 6 is a side view of a plate holder.

FIG. 7 is a partially cutaway plan view of a printing unit independent driving unit.

FIG. 8 is an exploded plan view of the printing unit independent driving unit.

FIG. 9 is a schematic plan view of a printing unit.

FIG. 10 is a schematic front view of a printing unit.

FIG. 11 is a front view showing the vicinity of a plate winding bar for explaining a plate winding operation.

FIG. 12 is a front view showing the vicinity of a plate winding bar for explaining a plate winding operation.

FIG. 13 is a front view of the vicinity of a plate winding bar for explaining a plate winding operation.

FIG. 14 is a front view showing the vicinity of a plate winding bar for explaining a plate winding operation.

FIG. 15 is a front view showing the vicinity of a plate winding bar for explaining a plate winding operation.

FIG. 16 is a side view showing the vicinity of a plate drum end for explaining a plate winding operation.

FIG. 17 is a side view showing the vicinity of a plate cylinder end portion for explaining a plate winding operation.

FIG. 18 is a side view showing the vicinity of a plate cylinder end portion for explaining a plate winding operation.

FIG. 19 is a flowchart of a plate exchange operation.

FIG. 20 is a flowchart of a plate exchange operation.

FIG. 21 is a flowchart of a plate exchange operation.

[Explanation of symbols]

 Reference Signs List 1 printing unit 7 plate cylinder 8 plate cylinder 55 line shaft 56 intermediate shaft 57 gear 58 gear 59 electromagnetic clutch 60 gear shaft 61 bevel gear 62 bevel gear 63 gear 64 gear 65 single motor 66 clutch 80 new edition 81 old edition

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B41F 27/12

Claims (1)

(57) [Claims] 1. A supporter on a line shaft installed along a base.
Connected to the driving motor via the driving clutch
Drive gears and each drive gear
Single drive side between single motor provided for each unit
An intermediate shaft connected via a clutch, and the intermediate shaft and the plate cylinder
And a gear device for driving connection between the
When the driving clutch is disconnected,
Switch is connected, and the plate cylinder is rotationally driven by the single motor.
Switch between the removal of the old version and the installation of the new version
This is performed for each printing unit, and during printing work,
Side clutch is connected and the single drive side clutch
Is cut off and switched to the rotation drive of the plate cylinder by the driving motor
Printing plate changing device for a rotary printing press.