JPH0957946A - Plate clamp device for rotary printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate clamp device for rotary printing machine wherein plate mounting operation can be done easily by a single operator, by automatically holding a plate loose position of a winding rod. SOLUTION: A plate clamp device comprises a lever 10 which is inserted into a long groove of a plate cylinder rotatably and is equipped with a retainer for holding a plate and is set in a hexagonal section 9 at an axial end of a winding rod, a compression coil spring 11 connected to one end of the lever 10 for always rotating and energizing the winding rod in a direction to stretch the plate, and a link mechanism consisting of a link 18 connected to other end of the lever 11 for rotating the winding rod and of a lever 21. There is also provided a stopper 25 which can hold a plate loose position of the winding rod by regulating the link mechanism at a predetermined position when the link mechanism rotates the winding rod in the plate loose direction against the energizing force and it exceeds a dead point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate clamp device for winding and clamping a printing plate on a plate cylinder in a web-fed rotary printing press.

[0002]

2. Description of the Related Art A plate for a web-fed rotary printing press is wound around a plate cylinder, and its front and rear ends are engaged with a winding rod in an axial long groove formed on the outer peripheral surface of the plate cylinder. By rotating the winding rod in a predetermined direction, the winding rod is drawn into the long groove and is attached to the plate cylinder in a tensioned state. The plate mounted on the plate cylinder is required to have an even tension in each direction and to be firmly held so as to prevent it from loosening and causing register errors during printing.

Conventionally, as this plate clamp device, there is one as shown in FIGS.
-69531 gazette etc.). In FIG. 6, reference numeral 1 denotes a retainer, which is housed in a cut groove 3 having a relatively large tapered cross section formed in the winding rod 2 and fixed by a pin 4. The retainer 1 is spring steel formed in a substantially V shape, and a plurality of retainers 1 are attached to the winding rod 2 in the axial direction at a predetermined interval in a compressed state. The end portion 1a on the left side in FIG. 6 of the retainer 1 presses the gripper 8a of the plate 8 with the inclined surface 7a of the long groove 7 formed in the plate cylinder 6 by its spring force. On the other hand, the end portion 1b on the right side of FIG. 6 of the retainer 1 is L
The plate 8 is bent into a letter shape, and this plate 8 also engages with the butt 8b bent into the L shape in the plate tension direction.

On the other hand, as shown in FIG. 7, a hexagonal portion 9 is formed at the end of the winding rod 2 so that the winding rod 2 can be rotated in any direction by a tool 15 such as a spanner. There is. A lever 10 is fitted to the base of the hexagonal portion 9, and a spring guide 12 for guiding the compression coil spring 11 is provided at the end thereof.
Are rotatably connected. Reference numeral 13 in the drawing denotes a spring holder attached to the bearer 14 on the end face of the plate cylinder.
The hexagonal portion 9, that is, the winding rod 2 is urged to rotate counterclockwise (plate tension direction) by the spring force of the compression coil spring 11, and is balanced with the spring force of the retainer 1 in the state shown in FIG. Therefore, when mounting the plate 8, the hexagonal portion 9, that is, the winding rod 2 is rotated in the clockwise direction (plate loosening direction) against the spring force by the tool 15 such as a spanner, and the both ends 1a of the retainer 1 are rotated. , 1b are moved to positions retracted with respect to the gripper 8a and the buttocks 8b of the plate 8, respectively.

[0005]

However, in the plate clamp device described above, when the plate is mounted (both on the both sides of the gripper 8a and the butt 8b), the winding rod 2 resists the spring force and the loosening position (retainer) is applied. It must be operated while rotating to the retracted position 1) and keeping that position. Therefore, when the above operation is performed by one person, it is necessary to hold the tool 15 with one hand and handle the plate 8 with the other hand, which is a very heavy labor. Was there. Therefore, there is a problem that labor management is adversely affected by securing workers.

Therefore, an object of the present invention is to provide a plate clamp device for a rotary printing press which can automatically hold the plate slack position of the winding rod so that the plate mounting operation can be easily performed by one person. Especially.

[0007]

A plate clamp device for a rotary printing press according to the present invention for achieving the above object includes a winding rod rotatably inserted in a long groove of a plate cylinder, and the winding rod. And a link mechanism connected to rotate the winding rod, and the link mechanism resists the biasing force to plate the winding rod. When rotating in the loosening direction and exceeding the dead point, the link mechanism is regulated at a predetermined position, and the regulating means can hold the plate loosening position of the winding rod.

According to the above construction, when the link mechanism rotates the winding rod in the plate loosening direction and exceeds the dead point when the plate is mounted, the linking mechanism restricts the winding rod to the predetermined position, and the winding rod moves to the plate loosening position. Since it is automatically held, the operator can handle the plate with both hands, and one person can operate it.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 is an upper half front view of the plate cylinder in the present apparatus, FIG. 2 is an operation state diagram of FIG. 1, FIG. 3 is a view showing an example of a driving mechanism of a link mechanism, FIG. 4 is a half side view of the plate cylinder, and FIG. FIG. 6 is a diagram showing a plate mounting procedure. In these figures, the same members as those in FIGS. 6 and 7 are designated by the same reference numerals, and duplicated description will be omitted.

As shown in FIG. 4, one long groove 7 is formed on the outer peripheral surface of the plate cylinder 6 in the axial direction, and a plurality of retainers 1 for holding the plate are provided in the long groove 7 in the axial direction. The winding rod 2 penetrates rotatably. Reference numeral 14 in the drawing denotes a bearer fitted to the shaft end of the plate cylinder 6.

As shown in FIG. 1, the shaft end of the winding rod 2 is formed in a hexagonal portion 9, and a lever 10 is fitted in the hexagonal portion 9. An upper end of a spring guide 12 for guiding the compression coil spring 11 is rotatably coupled to a pin 15 at one end of the lever 10, and a lower end screw shaft portion 12 thereof is provided.
a is supported by the holder 13 via a spring receiver 16. Therefore, the hexagonal portion 9, that is, the winding rod 2 is rotationally biased in the clockwise direction (plate tension direction) by the spring force of the compression coil spring 11, and balances with the spring force of the retainer 1.
Incidentally, reference numeral 17 in FIG. 1 denotes a nut for adjusting the spring load.

On the other hand, the other end of the lever 10 has a link 1
The upper end of 8 is rotatably connected to the pin 19, and
A lower end portion of the link 18 is a lever 21 rotatably supported by a pin 20 on the bearer 14 via a hexagonal tubular portion 21a.
Is connected to a pin 22 at the upper end of the link 18, and the link 18 and the lever 21 constitute a link mechanism.

Then, the link mechanism rotates the winding rod 2 in the plate loosening direction against the biasing force, and the dead point (the center point of the pin 22 where the line connecting the center points of the pins 19, 22 and 20 becomes a straight line). (A position on the rotation locus of), the stopper 25 that can be brought into contact with the upper side surface of the lever 21 as a regulation means that can regulate the link mechanism at a predetermined position to hold the plate loosening position of the winding rod 2. Are provided on the bearer 14 via the holder 23.

Further, the holder 23 is provided with a stopper 24 which comes into contact with the other end of the lever 10 to regulate the rotation limit of the winding rod 2 in the plate tension direction. It may be omitted depending on the balance with the spring force of 1.

Next, the procedure for mounting the plate will be described with reference to FIG. First, the lever 21 in the state shown in FIG. 1 is rotated counterclockwise until the hexagonal cylinder portion 21a is covered with a spanner or the like and hits the stopper 25. As a result, as shown in FIG. 2, the link mechanism is automatically held in a state in which it is bent slightly inward from the straight state where the lever 10, that is, the winding rod 2 is limited to rotate in the plate loosening direction.

In this state, as shown in FIG. 5 (a), the retainer 1 is at a position sufficiently retracted in the plate loosening direction (the direction of arrow B in the figure), and in this state, the gripper 8a side of the plate 8 is elongated. It is inserted in 7 and brought into close contact with the grip side of the plate cylinder 6.

Thereafter, while the rotating position of the winding rod 2 is maintained, the plate cylinder 6 is rotated once so that the plate 8 is brought into close contact with the plate cylinder 6, and this time, FIG. 5B. As shown in, the end of the plate 8 on the side of the bottom 8b is inserted into the long groove 7.

Thereafter, while holding the bottom 8b of the plate 8 with a pressing pad (not shown), the lever 21 is moved to its hexagonal cylinder portion 21.
Put a spanner on a and rotate it clockwise. On this occasion,
As shown in FIG. 1, the link mechanism moves clockwise (plate tension direction) by the spring force of the compression coil spring 11 when the lever 10 or the winding rod 2 has passed the straight line state which is the rotation limit in the plate loosening direction. It is urged to rotate and bends greatly outward,
Eventually, the spring force of the retainer 1 balances with the lever 1
0 hits the stopper 24 and further rotation is restricted.

In this state, as shown in FIG. 5 (c), the retainer 1 is at a position sufficiently advanced in the plate tension direction (direction of arrow A in the figure), and the plate 1 is gripped by the edge 1a on the gripping side. 8a is pressed, while the end portion 1b on the bottom side is the bottom 8b of the plate 8.
Is engaged in the plate tension direction, and the plate 8 is wound tightly around the plate cylinder 6.

On the other hand, when the plate 8 is separated, the lever 21 in the state shown in FIG. 1 is rotated counterclockwise until the lever 25 in the state shown in FIG. The mechanism is automatically held in a state of hitting the stopper 25. In this state, as shown in FIG. 5A, since the retainer 1 is at a position sufficiently retracted in the plate loosening direction, the gripper 8a side and the butt 8b side of the plate 8 are released from the retainer 1. Therefore, the plate cylinder 6 may be rotated once while pulling out the tail 8b side and pulling out from the gripper 8a side.

As described above, in this embodiment, since the winding rod 2 can be automatically held at the loose position of the plate 8 by the reversing action of the link mechanism, the work can be performed during the mounting of the plate 8 including the separation. A person only needs to handle the plate 8, and one person can easily operate it with both hands.

In this embodiment, the winding rod 2 is automatically held at the loose position of the plate 8 because both ends 1a and 1b of the retainer 1 are bent at the same height in the plate tension direction. In the state as it is, the gripper 8a side and the butt 8b of the plate 8
Since both sides can be inserted into the long groove 7 to perform the plate mounting operation, after inserting the gripper 8a side of the plate 8, the winding rod 2 is once rotated in the plate tensioning direction to pinch the gripper 8a side, and then As compared with the conventional one in which the winding rod 2 is rotated again by a predetermined angle in the loosening direction of the plate 8 and then the hip 8b side is inserted, the number of operation steps can be reduced and the operation time can be shortened.

FIG. 3 shows a modified example of the driving means of the link mechanism, which is an example in which two air cylinders 30 are selectively expanded and contracted in place of a tool such as a spanner for automation. In this case, if it strokes in two steps,
One air cylinder is enough.

In each of the above-described embodiments, the case where one lever is provided with the biasing means and the link mechanism has been described, but in the present invention, the lever provided at one end of the winding rod is provided with the biasing means. A link mechanism may be provided on a lever provided on the other end of the winding rod. Also, the plate mounting structure has been described in the case where the winding rod is provided with a retainer. However, both the holding side closely attached to the inclined surface of the notch of the plate and the hip side inserted into the groove of the winding rod It may have a structure in which the pressure is retained by the inclined surface of the notch and the peripheral surface of the winding rod by rotating the plate in the plate tension direction (see Japanese Patent Publication No. 62-25515, etc.).

[0025]

As described above, according to the present invention, the winding rod rotatably inserted in the long groove of the plate cylinder is connected to the winding rod so as to always bias the winding rod in the plate tension direction. The biasing means
A link mechanism connected to rotate the winding rod and a predetermined position of the link mechanism when the winding mechanism rotates the winding rod in the plate loosening direction against the biasing force and exceeds a dead point. A restriction means that can hold the plate loosening position of the winding rod by restricting with,
Since the link mechanism rotates the winding rod in the plate loosening direction and exceeds the dead point when the plate is attached, the linking mechanism automatically regulates the winding rod to the plate loosening position. Since it is held by the operator, the operator can handle the plate with both hands, and it is possible to obtain the effect of being a one-man operation light labor.

[Brief description of drawings]

FIG. 1 is a front view of an upper half of a plate cylinder showing an embodiment of the present apparatus.

2 is an operation state diagram of FIG. 1. FIG.

FIG. 3 is a diagram showing an example of driving means of a link mechanism.

FIG. 4 is a half side view of the plate cylinder.

FIG. 5 is a diagram showing a plate mounting procedure.

FIG. 6 is a sectional view of a main part of a conventional plate cylinder.

FIG. 7 is a front view of the plate cylinder.

[Explanation of symbols]

 8th Edition 9 Hexagonal part of winding rod shaft end 10 Lever 11 Compression coil spring 14 Bearer 18 Link 19 pin 20 pin 21 Lever 22 pin 23 Holder 24 Stopper 25 Stopper

Claims (1)

[Claims] 1. A winding rod rotatably inserted into a long groove of a plate cylinder, an urging means connected to always urge the winding rod to rotate in the plate tension direction, and the winding rod. A link mechanism connected to rotate, and when the link mechanism rotates the winding rod in the plate loosening direction against the biasing force and exceeds a dead point, the link mechanism is regulated at a predetermined position. A plate clamp device for a rotary printing press, comprising: a regulating unit capable of holding a plate loosening position of a winding rod.