JP2560089Y2 - Plate changing device for 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 device for a printing press for exchanging an old plate mounted on the peripheral surface of a plate cylinder with a plate vice and a new plate prepared outside the device. .

[0002]

2. Description of the Related Art A notch is provided in the outer peripheral portion of a plate cylinder of a printing press, the notch extending over the entire length of the cylinder. In the notch, a holding end of a printing plate (hereinafter simply referred to as a plate) is provided. A plate vise device consisting of a grip-side vice and a tail-side vise that grips the edge of the edge of the plate that is wrapped around the torso is fixed to the bottom of the notch. And extends in the axial direction of the plate cylinder. These added side in conventional plate clamping the trailing opens and closes the lockup table elongated extending in the axial direction of the plate cylinder, by its swinging swingably provided to the lockup table vise It has a plurality of holding plates for holding and releasing the plate between the table and a plurality of cams which engage with the edge notches of each of the holding plates, and the plurality of cams rotate. It is fixed in parallel on a free camshaft. A plurality of compression coil springs for urging the gripper plate in the opening direction are interposed between the vise table and the gripper plate.

[0003] With this configuration, when the plate is held, when the cam shaft is rotated, the holding plate is released from the engagement of the cam and opened by the elastic force of the compression coil spring. After inserting the edge of the plate between the gripper plate and the vise table, rotate the cam shaft in the opposite direction from the previous one,
The gripper plate swings and closes against the elastic force of the compression coil spring by the action of the cam, and grips the edge of the plate.

However, in each of these conventional plate vise devices, the cam shaft must be manually rotated to open and close the plate holding surface as described above.
There are problems that not only the number of man-hours increases, the workability is poor, and enormous labor is required, but also the preparation time is prolonged and the operation rate of the printing press is reduced.

[0005]

Therefore, the present applicant provided a plate holding device holding a new plate between units of a printing press, and
Developed and proposed a plate exchange device that discharges and retains the old plate removed from the plate cylinder into this plate holder, and instead discharges the new plate from the plate holder and mounts it on the plate cylinder. However, in this device, a suction pad for sucking a new plate, an air cylinder as a driving device for moving it to the plate vise of the plate cylinder, a guide plate for guiding the new plate, and the like are provided on the front side of the plate holding device. Because it is provided, preparation work for holding the new plate in the plate holding device is difficult to perform, and these suction pads, air cylinders, and the like protrude from the surface of the plate holding device that is hanging during the printing operation. Since the work space between the printing units is narrowed, there is a problem that the work is difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a plate changing device which can provide a plate holding device without reducing a work space between printing units. I have.

[0007]

According to the present invention, a printing plate holding device for holding a new plate to be supplied to a plate cylinder is moved between an operation position and a storage position. While being supported by the machine base, a new plate held by the plate holding device is received from the plate holding device and the new plate hoe is received.
The plate was added the side insertion unit to be supplied to the plate cylinder of the edge side portion, provided on the base side for supporting the plate cylinder and the trailing edge of the new plate
A printing plate rear side insertion device for supplying an end to the plate cylinder was provided.

[0008]

After the old plate is removed from the plate cylinder by moving the plate holding device to the operation position, the plate insertion device provided on the machine base is operated to receive the lower end of the new plate by suction or the like, and the plate cylinder is received. After the plate cylinder is rotated by about one turn in addition to the plate vise, the plate replacement operation is completed by adding the plate bottom to the plate vise. Thereafter, the printing plate holding device is stored , but since the printing plate insertion device is left on the machine base side , the working space between the printing units is not narrowed.

[0009]

1 and 2 show an embodiment of a plate changing device for a printing press according to the present invention. FIG. 1 is a side view showing the vicinity of a lower end portion of a plate holding device in an operating position, and FIG. It is an outline side view of the whole exchange device. In the figure, left and right machine frames 1
A notch over the entire length of the plate cylinder 2 is formed in the outer peripheral portion of the plate cylinder 2 which is pivotally supported on the plate cylinder 2. A butt side vise indicated by 4 is provided. In the figure, the relative positions of the grip-side plate vise 3 and the rear-side plate vise 4 are shown in positions opposite to the actual positions in the trunk circumferential direction for convenience of explanation. Of these, the grip-side vise 3 is swingably supported by a vise stand 5 having a substantially rectangular cross section and extending in the axial direction of the plate cylinder 2 and a short shaft 6 on the side of the vise stand 5. The gripping end of the plate 8 inserted between the gripping surfaces 5a, 7a cooperates with a spring member (not shown) by swinging the gripping plate 7 by a cam mechanism (not shown). It is configured to be held or released from the mouth.

Further, the vice 4 on the rear side is pivotally movable about a shaft 9.
A lockup table 10, which is fitted extending in the axial direction of the plate cylinder 2, the gripper board 11 and a pivoting cam 12 of the camshaft that is rotatably supported at both ends in a circular plate-shaped bearer across the notch By doing so, the butt side gripping end of the plate 8 inserted between the gripping surfaces 10a and 11a is configured to be gripped or released from the grip in cooperation with a spring member (not shown). The gripping surfaces 5a and 7a of the gripping plate vise 3 extend in the circumferential direction of the plate cylinder 2, and the gripping surfaces 10a and 11a of the trailing plate vise 4 extend in the radial direction of the plate cylinder 2. . Also, the edge on the grip side of the plate 8 is straight, and the edge on the tail side is
It is bent at right angles by a plate bending machine. Further, a cam mechanism for opening and closing the gripping surfaces of the grip-side plate vice 3 and the tail-side plate vise 4 is configured to operate at a predetermined timing by an air cylinder (not shown).

[0011] For example, in the case of a four-color printing sheet-fed printing machine,
Each color printing unit is provided with a printing plate changing device for replacing a used old plate with a new plate to be used.
That is, the upper end surface of the frame 1 provided in each of the printing units for the second, third, and fourth colors, and
A pair of left and right brackets 13 are fixed to the upper end surface of a frame (not shown) provided with a space portion separated from the frame 1 of the grain printing unit at a position obliquely above the plate cylinder 2. These brackets 13 include a loader shaft 14
Of the loader shaft 1 are rotatably supported at both ends thereof.
Reference numeral 4 denotes a loader 15 as a plate holding member formed in a horizontally-long rectangular shape having substantially the same length as the plate cylinder 2 in a front view (detailed later).
However, the base end is fixed.

On the other hand, an air cylinder 16 connected to a control device is provided on the left and right frames 1 (hereinafter also including the frame provided at the starting end of the sheet discharging device).
The lever 18 pivotally attached to the frame 1 side and the lever 19 pivotally attached to the loader 15 pivotally rotate at the working end of the piston rod 17 in the vicinity of the piston rod 17. It is freely supported. By doing so, when the piston rod 17 of the air cylinder 16 advances and retreats, the loader 15 swings via levers 18 and 19, and the
Is pivoted between a storage position in a hanging state indicated by, and an operating position in a tilting state indicated by reference numeral 15A, so that the leading end moves in the direction toward and away from the peripheral surface of the plate cylinder 2.

Therefore, the configuration of the loader 15 will be described. The loader 15 is provided with a long guide plate 21 and a short guide plate 22 with an entrance formed in a V-shape.
Between the guide plates 21 and 22, the old plate 8 which is released from the grip by opening the butt-side plate vise 4 and then rewinded by the rotation of the plate cylinder 2 enters upward. I have.

On the other hand, the upper half of the loader 15 is provided with an air cylinder 23 supported at both upper and lower ends by a bracket 24 and the guide plate 21. The working end of a piston rod 23a of the air cylinder 23 is provided. A suction pad 25 that moves forward and backward as shown by a solid line and a chain line in the figure due to the advance and retreat of the piston rod 23a is fixed via a slide bar 26. And is released from suction at the solid line position. A stopper 27 pivotally attached to the lower end of the loader 15 is configured to enter the loader 15 and support the old plate 8 released from suction of the suction pad 25.

Next, the plate feeding device will be described. Loader 1
A plurality of pins 30 are provided in parallel at the lower end of the surface of the loader 15 in the width direction of the loader 15, and a new plate case 31 is provided at the upper end of the loader 15 by bending the bracket 24. Is formed. The new plate 32 supplied to the plate cylinder 2 instead of the old plate 8 is prepared during the printing operation, the lower end groove is engaged with the pin 30, the upper end is engaged with the new plate case 31, and is held by the loader 15. Have been. It should be noted that a plurality of new editions 32 are held in order of use.

In the present apparatus, a plate insertion device for receiving the new plate 32 held by the loader 15 from the loader 15 and holding the new plate 32 to the holding plate vise 3 is provided on the machine frame 1 side. Have been. That is, a pair of brackets 41 provided in the plate insertion device, generally designated by the reference numeral 40, are provided in a space formed between the distal end of the loader 15 in the operating position and the peripheral surface of the plate cylinder 1. , 4
2 are fixed on the planes of the left and right machine frames 1 in parallel in the direction in which the loader 15 extends, and between the brackets 41 and 42, a cylinder shaft 43 is fixedly mounted and a nut 44 is fixed. It is fixed at. Air cylinders 45 connected by a hose or the like to a pressure air source (not shown) are supported on the left and right cylinder shafts 43 so as to be able to advance and retreat, respectively.
6 are connected. A plurality of suction pads 47 are arranged side by side on the slide bar 46.
7, the new plate 32 is sucked and moved on the cylinder shaft 43 by the air cylinder 45, so that the new plate 32 is held on the holding plate vice 3.

On the other hand, an arm shaft 48 is rotatably mounted on the lower end of the loader 15, and roller arms 49 are fixed to both side protruding portions of the arm shaft 48 from the loader 15. A roller shaft 50 is fixedly supported between the free ends of the arms 49, and a plurality of press rollers 51 formed of, for example, rubber or a brush rotate on the roller shaft 50. They are freely juxtaposed. The working end of the piston rod 54 of the air cylinder 53 fixed to one end in the width direction of the loader 15 via the bracket 52 includes:
A lever 56 is fixed via a connecting plate 55, and a free end of a lever 57 fixed to the arm shaft 48 is pivotally attached to a lower end of the lever 56. Thus, when the piston rod 54 of the air cylinder 53 advances and retreats, the arm 49 rotates between the storage position and the use position shown in the drawing, and the press roller 51 moves the new plate 3 on the plate cylinder 2 at the use position.
2, the new plate 38 is brought into close contact with the peripheral surface of the plate cylinder 1, and the tail-end bent end of the new plate 32 is inserted into the open rear plate vise 4. Reference numeral 58 denotes a guide roller fitted on the arm shaft 48 to slide the new plate 32 in a tangential direction.

Reference numeral 59 denotes an inking roller of an inking device which is brought into contact with the plate surface on the plate cylinder 2 and adheres ink to the plate surface. Generally, four or more rollers are provided. A blanket cylinder 60 contacts the plate cylinder 1 and transfers an image formed on the plate surface.

The operation of the plate exchange device configured as described above will be described. During the printing operation, the loader 15 fixed to the loader shaft 14 is hung down from the bracket 13, and a plurality of new plates 32 are stacked in the order of use and supported by the new plate case 31 and the pins 30 so that the new plate 32 Is held. Further, the piston rod 23a of the air cylinder 23 in the loader 15 is moving forward, and the suction pad 25 is lowered to the dashed line position.

After the printing operation is completed, the old version 8 is replaced with the new version 32.
When the start button is pressed, the air cylinder 16 is actuated and the loader 1 is exchanged via the levers 18 and 19.
5 tilts to the plate exchange position indicated by reference numeral 15A in FIG. 1, and the servo motor rotates to rotate by a predetermined angle and stop until the plate cylinder 2 occupies the plate discharge position. Then, since the cam 12 is rotated by a driving device (not shown), the grip-side plate vise 3 and the tail-side plate vise 4 are simultaneously opened.

In this state, the rear end of the old plate 8 protrudes from between the rear plate vise 4 due to its rigidity and the plate cylinder 2 rotates. 2
It enters between the two and is sucked by the suction pad 25. When the entered old plate 8 passes through a sensor (not shown), the sensor detects this and operates the air cylinder 30 to retract the piston rod 31, so that the old plate 8 sucked by the suction pad 25 enters the loader 15. . When the old plate 8 enters the predetermined position, the old plate 8 is released from the suction of the suction pad 25, is supported by the stopper 27, and is held by the loader 15.

When the plate discharging operation is completed in this manner, the servomotor operates to slightly rotate the plate cylinder 2, and as shown in FIG. 1, the open plate holding surfaces 5a and 7a of the holding plate vise 3 are loaded into the loader. It stops at a position on the extension of the new version 32 held at 15. At this time, suction air acts on the suction pad 47 supported by the slide bar 46 on the frame 1 side, and the new plate 3
At the same time, the air cylinder 45 is operated to move the suction pad 47 from the solid line position to the chain line position in FIG. 1 with the slide bar 46, so that the new plate 32 held by the suction pad 47 is moved along its moving path. The new plate 38 descends while being guided while sliding on the guide rollers 58 facing the peripheral surface, and the new plate 38 is inserted into the plate-side vise 3 with its grip-side end. At this time, when the air cylinder for opening and closing the vise is activated, the cam 1
The second plate 32 is rotated, and the new plate 32 is added to the holding plate vice 3.

In this state, the servomotor rotates and the plate cylinder 2
Is rotated, and the new plate 32 is wound around the peripheral surface of the plate cylinder 2, and stops at a position where the buttocks side bent end corresponds to the press roller 51. When the plate cylinder 1 rotates, the guide rollers 58 rotate while being pressed against the surface of the new plate 32, so that the new plate 32 comes into close contact with the peripheral surface of the plate cylinder 2. After this, the air cylinder 53
Is operated, the piston rod 54 moves backward, and the lever 56,
The arm 49 is rotated via 57 and a press roller 51 formed of rubber, a brush, or the like is pressed against the peripheral surface of the plate cylinder 2, whereby the rear end bent end of the new plate 32 is moved by the press roller 51 to the rear plate. It is inserted in vise 4. When the rear end of the new plate 32 is inserted into the vice 4 of the rear plate, the air cylinder operates to operate the cam 1.
By the rotation of 2, the vice side vise 4 is closed, and the insertion end of the new version 32 is held. Then, at the end of the rotation of the cam 12, the vise table 10 and the gripping plate 11 move in the circumferential direction of the plate cylinder 2 integrally, so that the new plate 32 is stretched and adheres closely to the peripheral surface of the plate cylinder 2. .

Thereafter, after the air cylinder 53 is operated and the presser roller 51 is stored, the piston rod 17 of the air cylinder 16 retreats and pulls the levers 18 and 19, so that the loader 15 hangs down and is stored. The printing operation can be resumed. The old edition 8 can be taken out of the loader 15 at an appropriate time during the printing operation, and the new edition 32 can be mounted on the loader 15 and prepared as described above. Since the loader 15 in the stored state is not provided with the suction pad and its driving device, the loader 15
There are no protrusions from the loader, and the loader can be formed thin.

[0025]

As is apparent from the above description, according to the present invention, a plate holding device for holding a new plate to be supplied to a plate cylinder in a plate changing device of a printing press is provided with an operation position and a storage position. While supporting the machine to move between
A plate- side insertion device that receives a new plate held by the plate-holding device from the plate-holding device and supplies the plate- side end of the new plate to the plate cylinder, on a base side that supports the plate cylinder. A printing plate rear side which is provided and supplies the rear end of the new plate to the plate cylinder;
By providing an insertion device, the thickness of the printing plate holding device can be reduced and there is no protrusion to the outside.Therefore, maintenance work, color change of ink, plate change, as well as preparation of new plate and removal of old plate And other work surfaces are expanded, and workability and safety are improved. In addition, when replacing plates,
Only requires the plate holder to hold the new plate.
The edge on the side of the printing plate and the edge on the butt side are respectively
Is performed by the insertion device and the plate-side insertion device
In this way, plate replacement can be performed quickly and easily.
Wear.

[Brief description of the drawings]

FIG. 1 is a side view showing the vicinity of a lower end portion of a plate holding device in an operating position.

FIG. 2 is a schematic side view of the entire plate changing apparatus.

[Explanation of symbols]

 Reference Signs List 1 frame 2 plate cylinder 3 side plate vise 4 rear plate vise 15 loader 15A loader 32 new plate 40 plate insertion device 45 air cylinder 47 suction pad

Claims (1)

(57) [Scope of request for utility model registration] 1. A plate holding device for holding a new plate to be supplied to a plate cylinder is supported on a machine base so as to move between an operating position and a storage position, and a new plate held by the plate holding device is held. Receive the edge of the new plate from this plate holding device
The plate was added the side insertion device for supplying to the plate cylinder section, provided on the base side for supporting the plate cylinder, and before the trailing edge of the new plate
A printing plate changing device for a printing press, comprising a printing plate rear side insertion device for supplying a printing plate to a printing cylinder .