JP3404192B2 - Plate clamping device for rotary printing press - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate clamping device for winding a printing plate around a plate cylinder in a web rotary printing press. 2. Description of the Related Art After a plate of a web-fed rotary printing press is wound on a plate cylinder, the leading end and the rear end of the plate are engaged with a winding rod in an axially 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 mounted on 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 be loose during printing and not to cause registration errors or the like. Conventionally, there is a plate clamping device as shown in FIGS. 6 and 7 (Japanese Patent Application Laid-Open No.
No. 69531). In FIG. 6, reference numeral 1 denotes a retainer, which is housed in a relatively large tapered cross section 3 formed in the winding rod 2 and fixed by a pin 4. The retainer 1 is a spring steel formed in a substantially V-shape, and a plurality of retainers 1 are attached to the winding rod 2 at a predetermined interval in the axial direction in a compressed state. The left end 1a of the retainer 1 in FIG. 6 presses the grip 8a of the plate 8 between the inclined surface 7a of the long groove 7 formed in the plate cylinder 6 by the spring force. On the other hand, the right end 1b of the retainer 1 in FIG.
The plate 8 is engaged with the buttocks 8b of the plate 8 which are also bent in 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 turned in any direction by a tool 15 such as a spanner. I have. A lever 10 is fitted to the base of the hexagonal portion 9, and a spring guide 12 for guiding a compression coil spring 11 is provided at an end thereof.
Are rotatably connected. In the drawing, reference numeral 13 denotes a spring holder attached to a bearer 14 on the plate cylinder end surface.
The hexagonal portion 9, that is, the winding rod 2 is urged to rotate counterclockwise (in the direction in which the plate is stretched) 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 the plate 8 is attached, the hexagonal portion 9, that is, the winding rod 2 is rotated clockwise (the plate slack direction) against the spring force by a tool 15 such as a wrench, and both ends 1 a of the retainer 1 are rotated. , 1b are moved to positions retracted with respect to the grip 8a and the tail 8b of the plate 8, respectively. [0005] However, in the above-described plate clamping device, when the plate is mounted (on both sides of the grip 8a and the buttocks 8b), the winding rod 2 is loosened against the spring force. It must be rotated to the position (retracted position of the retainer 1) and operated while keeping the position. Therefore, when the above operation is performed by one person, it is necessary to handle the plate 8 with one hand while holding the tool 15 with the other hand. I was Therefore, there is a problem that labor management is adversely affected by securing workers and the like. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a plate clamping device for a rotary printing press in which the plate mounting operation can be easily performed by one person by automatically holding the plate slack position of the winding rod. It is in. According to the present invention, there is provided a plate clamping apparatus for a rotary printing press according to the present invention, comprising: a winding rod rotatably inserted into a long groove of a plate cylinder; An urging means connected to constantly rotate the winding rod in the plate tension direction, a link mechanism connected to rotate the winding rod, and a mechanism for winding the winding rod against the urging force. And a restricting means for restricting the link mechanism at a predetermined position when the rod is rotated in the plate loosening direction and exceeding the dead point, thereby maintaining the winding rod at the plate loose position. According to the above construction, when the plate is mounted, the link mechanism rotates the winding rod in the plate loosening direction, and when the link mechanism exceeds the dead point, the restricting means restricts the winding rod to the predetermined position. Since the plate is automatically held, the operator can handle the plate with both hands and can operate the plate alone. An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. 1 is an upper half front view of a plate cylinder in the present apparatus, FIG. 2 is an operation state diagram of FIG. 1, FIG. 3 is a diagram showing an example of a driving mechanism of a link mechanism, FIG. FIG. 4 is a diagram showing a procedure for mounting a plate. In these drawings, the same members as those shown in FIGS. 6 and 7 are denoted by the same reference numerals, and redundant description will be omitted. As shown in FIG. 4, one long groove 7 is formed in the outer peripheral surface of the plate cylinder 6 in the axial direction, and a plurality of the retainers 1 for holding the plate are provided in the long groove 7 in the axial direction. The winding rod 2 penetrates rotatably. In the figure, reference numeral 14 denotes a bearer fitted to the shaft end of the plate cylinder 6. As shown in FIG. 1, a shaft end of the winding rod 2 is formed in a hexagonal portion 9, and a lever 10 is fitted to the hexagonal portion 9. An upper end of a spring guide 12 for guiding a compression coil spring 11 is rotatably coupled to a pin 15 at one end of the lever 10, and a lower end screw shaft 12
a is supported by the holder 13 via the spring receiver 16. Accordingly, the hexagonal portion 9, that is, the winding rod 2, is rotationally urged clockwise (in the plate tension direction) by the spring force of the compression coil spring 11, and balances with the spring force of the retainer 1.
In FIG. 1, reference numeral 17 denotes a nut for adjusting a spring load. On the other hand, the other end of the lever 10 has a link 1
8 is rotatably coupled to the pin 19,
A lower end of the link 18 is rotatably supported by a pin 20 on the bearer 14 via a hexagonal cylinder 21a.
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 urging force so that the dead point (the center point of the pin 22 where the line connecting the center points of the pins 19, 22, and 20 is straight) is formed. (A position on the rotation locus of the lever 21), a stopper 25 that can abut on the upper side surface of the lever 21 as a restricting means that can restrict the link mechanism at a predetermined position and maintain the plate slack position of the winding rod 2. Is provided on the bearer 14 via the holder 23. The holder 23 is provided with a stopper 24 which abuts on the other end of the lever 10 to limit the rotation limit of the winding rod 2 in the plate tension direction. It may be omitted in consideration of the spring force of 1. Next, the procedure of plate mounting will be described with reference to FIG. First, the lever 21 in the state shown in FIG. 1 is rotated counterclockwise until it hits the stopper 25 by applying a spanner or the like to the hexagonal cylinder portion 21a. As a result, as shown in FIG. 2, the link mechanism is automatically held in a state in which the lever 10 or the winding rod 2 is slightly inwardly bent from a linear state in which the rotation of the winding rod 2 in the plate loosening direction is limited. In this state, as shown in FIG. 5A, the retainer 1 is at a position where it is sufficiently retracted in the plate loosening direction (the direction of arrow B in the figure). In this state, the grip 8a side of the plate 8 is elongated. 7 and is brought into close contact with the gripping side of the plate cylinder 6. Thereafter, while the rotation position of the winding rod 2 is maintained, the plate 8 is rotated once so that the plate 8 is in close contact with the plate cylinder 6, and this time, FIG. 2, the edge of the plate 8 on the side of the tail 8 b is inserted into the long groove 7. Thereafter, the lever 21 is pressed against the hexagonal cylinder portion 21 while holding the bottom 8b of the plate 8 with a holding pad (not shown).
a is rotated clockwise with a spanner or the like. On this occasion,
As shown in FIG. 1, the link mechanism moves clockwise (plate tension direction) due to the spring force of the compression coil spring 11 after passing through a straight line state in which the lever 10, that is, the winding rod 2, rotates in the plate loosening direction. Being pivoted and bends outward greatly,
Eventually, the spring force of the retainer 1 is balanced and the lever 1
0 hits the stopper 24 and further rotation is regulated. In this state, as shown in FIG. 5C, the retainer 1 is at a position where it has sufficiently advanced in the plate tension direction (the direction of the arrow A in the figure), and the grip 1 holds the plate 8 at the grip end 1a. 8a, while the end 1b on the butt side is the butt 8b of the plate 8.
And the plate 8 is engaged in the plate tension direction, and the plate 8 is wound around the plate cylinder 6 in tension. 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 21 in the state shown in FIG. The mechanism is automatically held in a state where the mechanism hits the stopper 25. In this state, as shown in FIG. 5A, since the retainer 1 is at a position where it is sufficiently retracted in the plate loosening direction, the grip 8a side and the tail 8b side of the plate 8 are released from the retainer 1. Therefore, it is only necessary to rotate the plate cylinder 6 once while pulling out the tail 8b side and pull out the grip 8a side. As described above, in the present embodiment, the winding rod 2 can be automatically held at the slack position of the plate 8 by the reversing action of the link mechanism. The user only needs to handle the plate 8, and one person can easily operate it with both hands. Further, in the present embodiment, the winding rod 2 is automatically held at the slack position of the plate 8 because both ends 1a and 1b of the retainer 1 are both bent at substantially the same height in the plate tension direction. In the same state, the side 8a of the plate 8 and the bottom 8b
In order to perform the plate mounting operation by inserting both sides into the long groove 7, after inserting the grip 8a side of the plate 8, the winding rod 2 is once rotated in the plate tension direction to clamp the grip 8a side. The number of operation steps can be reduced and the operation time can be reduced as compared with the conventional one in which the winding rod 2 is again rotated by a predetermined angle in the loosening direction of the plate 8 and then the butt 8b side is inserted. FIG. 3 shows a modification of the drive means of the link mechanism, which is an example in which two air cylinders 30 are selectively extended and retracted to perform automation instead of a tool such as a spanner. In this case, if it strokes in two stages,
Only one air cylinder is required. In each of the above embodiments, the case where one lever is provided with the urging means and the link mechanism has been described. However, in the present invention, for example, the lever provided at one end of the winding rod is provided with the urging means. Alternatively, a link mechanism may be provided on a lever provided at the other end of the winding rod. In addition, the plate mounting structure has been described in the case where the winding rod is provided with a retainer. (See Japanese Patent Publication No. 62-25515). As described above, according to the present invention, the winding rod rotatably inserted into the long groove of the plate cylinder, and the winding rod is always urged to rotate in the plate tension direction. Urging means linked to
A link mechanism connected to rotate the winding rod, and the link mechanism rotates the winding rod in the plate loosening direction against the urging force to move the link mechanism to a predetermined position when the dead end point is exceeded. Regulating means capable of regulating the position of the roll bar in the loosened position by regulating
When the plate is mounted, the link mechanism rotates the winding rod in the plate loosening direction, and when the dead point is exceeded, the restricting means restricts the winding rod to a predetermined position, and the winding rod automatically moves to the plate loosening position. , The operator can handle the plate with both hands, and the effect of one-handed light labor can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an upper half front view of a plate cylinder showing an embodiment of the present apparatus. FIG. 2 is an operation state diagram of FIG. 1; FIG. 3 is a diagram illustrating an example of a driving unit of a link mechanism. FIG. 4 is a half side view of the plate cylinder. FIG. 5 is a diagram showing a procedure for mounting a plate. 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. [Description of Signs] 8 Plate 9 Hexagonal portion 10 of rod 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 25 Stopper

Claims (1)

(57) [Claim 1] A winding rod rotatably inserted into a long groove of a plate cylinder, and a winding rod connected to constantly rotate and urge the winding rod in a plate stretching direction. An urging means, a link mechanism connected to rotate the winding rod, and a link mechanism rotating the winding rod in the plate loosening direction against the urging force to move the winding rod past a dead point. A plate clamping device for a rotary printing press, comprising: a regulating unit that regulates a link mechanism at a predetermined position to maintain a plate slack position of a winding rod.