JP2007112085A - Plate retaining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent poor gripping of a plate cylinder to a plate vise from developing and improve its durability. <P>SOLUTION: A plate retainer 13 is equipped with a moving block 14 movable to the inserting direction of a machine plate and suction pads 15, which move integral with the moving block 14 and suck the machine plate. The moving block 14, the rods 39 of hydraulic pressure cylinders 38 and cylinder end parts 41 are connected together by a pair of linkages 30A and 30B. The linkages 30A and 30B consist of first arms 33A and 33B, one end part of each of which is pivoted to a cover 7, and second arms 37A and 37B, one end part of each of which is pivoted to the moving block 14. The other end parts of the first arm 33A and of the second arm 37A are pivoted through pins 40A to the rods 39 of the hydraulic pressure cylinders 38. The other end parts of the first arm 33B and of the second arm 37B are pivoted through pins 40B to the cylinder end parts 41 of the cylinder end parts 41 of the hydraulic pressure cylinders 38. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a plate holding device for feeding a printing plate to a plate cylinder.

This type of plate holding apparatus is provided with a plate holder for holding a printing plate sucked by a suction pad. The plate holder is located at a plate holding position separated from the plate cylinder and a plate vise of the plate cylinder. It is configured to move between the plate insertion positions for inserting the printing plates. The conventional plate holding device includes a pair of left and right air cylinders attached to the left and right frames, a cover pivotally attached to each rod of the air cylinder, and a plate holder attached to the cover. The plate holder moves between the plate holding position and the plate insertion position by moving the rods forward and backward simultaneously to open and close the cover, and the plate is moved between the plate holding position and the plate vise. Some of them are inserted into the inside (for example, see Patent Document 1).
JP 2000-300304 A (paragraphs “0019” and “0020”, FIG. 3)

  In the conventional plate holding apparatus described above, the plate holder is moved by a pair of left and right air cylinders. Therefore, unless the two air cylinders are completely synchronized, the timing of moving the left and right sides of the cover is shifted. . For this reason, the plate holder that moves integrally with the cover may be skewed without going straight in the plate insertion direction. Even if the plate holder is skewed even slightly, the amount of holding on the left and right sides of the printing plate, which is added depending on the plate vise of the plate cylinder, is different, which causes a printing defect or a holding defect. Further, when the plate holder is skewed, there is a problem in durability because wear easily occurs between the plate holder and the guide member for guiding the plate holder.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a plate holding apparatus that prevents a plate cylinder from being poorly held in a vise and has improved durability. By the way.

  To achieve this object, the invention according to claim 1 is a plate that is supported by a support member and moves between a plate holding position for holding the printing plate and a plate insertion position for inserting the printing plate into the plate cylinder. In the plate holding apparatus provided with the holder, the first arm having one end pivotally attached to the support member side and the second arm having one end pivotally attached to the plate holder side are included. A pair of link devices having the other ends pivoted to each other are provided, and one fluid pressure cylinder is interposed between the link devices.

  The invention according to claim 2 is the invention according to claim 1, further comprising a guide member that regulates movement of the plate holder in the width direction and guides movement of the plate holder in the printing plate insertion direction. .

  The invention according to claim 3 is the invention according to claim 1, wherein a plurality of pairs of the first arm and the second arm are provided, and the fluid pressure cylinder is interposed between the plurality of pairs of arms. .

  According to the first aspect of the present invention, since the drive source for moving the plate holder is a single fluid pressure cylinder, the pair of second arms pivotally attached to the plate holder side are completely synchronized. In order to operate, the plate holder moves straight in the plate insertion direction without skewing. For this reason, since the holding amounts on the left and right sides of the printing plate added to the plate vise of the plate cylinder are the same, it is possible to prevent defective printing and to prevent the holding failure of the plate cylinder to the plate vise. In addition, since the plate holder does not skew, wear generated between the plate holder and the guide member that guides the plate holder can be reduced.

  According to the second aspect of the invention, since the plate holder is accurately moved by the guide member, the printing plate can be accurately inserted into the plate vise of the plate cylinder.

  According to the third aspect of the invention, the plate holder is moved by the plurality of pairs of the first and second arms, so that skewing can be more reliably prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a front view showing a right half of a printing press to which a plate holding device according to the present invention is applied, FIG. 2 is a front view showing the same left half, FIG. 3 is a view taken along arrow III in FIG. 1, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1, FIG. 5 is a cross-sectional view taken along line VV in FIG. 1, FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 1 and 2, a line GG indicates the center of the printing machine in the left-right direction (arrow A-B direction).

  In FIGS. 1 and 2, a first cover 3 and a second cover 4 that cover the front side of the plate cylinder 2 are horizontally mounted between the left and right frames 1 and 1. The first cover 3 is provided with an elongated rectangular window 3a over substantially the entire area between the left and right frames 1 and 1. A part of the peripheral surface of the plate cylinder 2 is provided with a notch 2a over the entire axial direction of the cylinder, as shown in FIG. 3, and a notch 2a is provided with an end on the holding side of the printing plate. A side plate vise 2A and a bottom plate vise 2B that includes the bottom end of the printing plate are provided. Reference numeral 5 denotes an elongated rectangular bracket provided at the upper edge of the window 3a, which is positioned when a printing plate to be inserted into the holding side plate vise 2A of the plate cylinder 2 is sucked to a suction pad 15 described later. Two positioning pins 6 to be used are implanted.

  7 is a third cover as a support member that covers the window 3a, and is rotatably supported on both side edges of the window 3 so as to open and close the window 3 via left and right support shafts 8 and 8, A large number of long holes 7a extending in the direction of arrow CD are provided in a staggered manner in the direction of arrow AB. As shown in FIG. 3, a rod 9a of an opening / closing fluid pressure cylinder 9 having an upper end pivotally attached to the bracket 5 is pivotally attached to the lower portion of both side edges of the third cover 7, and the rod 9a advances. As a result, the third window 7 rotates in the clockwise direction in FIG.

  In FIG. 5, reference numeral 10 denotes a guide member formed in an elongated triangular prism shape, which has the same length as that of the third cover 7 in the direction of the arrows AB, and the printing plate is made up of the plate cylinder 2. A guide surface 10a is provided to guide the holding side plate vise 2A. Reference numeral 11 denotes an abutting block formed in an elongated rectangular parallelepiped shape, and is formed to have substantially the same length as that of the third cover 7 in the direction of arrows AB. The abutting block 11 is attached by a bolt 12 so as to sandwich a bent portion 7b formed at a right angle at an end portion in the arrow C direction of the third cover 7 together with the guide member 10.

  A plate holder 13 is supported on the third cover 7 through a pair of link devices 30A and 30B, which will be described later, so as to be movable in the CD direction in the figure. And a large number of suction pads 15 that move in a moving manner. Reference numeral 16 denotes a plurality of set screws that are screwed onto the end face of the moving block 14, and the set screws 16 are provided so that the suction pads 15 and an air passage 17 (to be described later) can be surely communicated with each other. It functions as a plug that prevents air from leaking from the threaded hole.

  Reference numeral 17 denotes an air passage formed in a hollow shape in the moving block 14 and connected to an intake source (none of which is shown) via an air tube. Reference numeral 18 denotes a mounting panel attached to the moving block 14, and the suction pad 15 is directed to the moving block 14 in the direction of arrows AB so that the suction pad 15 faces the elongated hole 7 a of the third cover 7. It is attached in a zigzag pattern. Suction air is supplied to the suction pad 15 from an intake source via an air passage 17 of the moving block 14.

  Reference numerals 19 and 19 denote a pair of left and right spring shafts projecting from the moving block 14 in the direction of arrow D, and their tip portions penetrate through the through holes 21a of the spring receiver 21 attached to the third cover 7 via the substrate 20. It is inserted. Reference numerals 22 and 22 denote a pair of left and right compression coil springs wound around the spring shaft 19 and elastically mounted on the spring receiver 21 and the moving block 14, and urge the moving block 14 in the direction of arrow C. Reference numeral 23 denotes a stopper facing the end surface of the spring shaft 19, which is screwed into the block 24 attached to the third cover 7 via the substrate 20, so that the moving end of the moving block 14 in the direction of arrow D is limited. Is to adjust.

  In FIG. 4, 25 is a guide member attached to the third cover 7, and a pair of guide members are provided at the left and right ends of the moving block 14 as shown in FIGS. These guide members 25 are formed in a U-shaped cross section, and are provided with guide recesses 25a that restrict the movement of the moving block 14 in the direction of arrows AB and guide the movement of the moving block 14 in the direction of arrows CD. ing. An inner cover 26 is attached to the third cover 7 via a sleeve 27.

  Next, a pair of left and right link devices 30A and 30B that support the plate holder 13 movably in the direction of arrow CD on the third cover 7 will be described with reference to FIGS. In FIG. 7, reference numeral 31 denotes a base plate attached to the third cover 7, which extends in the direction of arrows AB. A pair of first pins 32, 32 are attached to both ends of the base plate 31, and a pair of left and right first pins are formed on the narrow diameter portion formed at the upper end of the first pins 32, 32. One ends of the arms 33A and 33B are pivotally attached.

  In FIG. 7, reference numerals 35 and 35 denote a pair of left and right support blocks attached to the moving block 14, and second pins 36 and 36 are implanted therein. One end of each of the two arms 37A and 37B is pivotally attached. 38 is a fluid pressure cylinder, and the tip 39a of the rod 39 is formed in a bifurcated shape as shown in FIG. The other end portions of the first and second arms 33A and 37A are pivotally attached to the tip portions 39a and 39a via a third pin 40A. The other end of the first and second arms 33B and 37B is pivotally attached to the tip of the cylinder end portion 41 of the fluid pressure cylinder 38 via a third pin 40B.

  The third pins 40A and 40B are positioned between the first and second pins 32 and 36. In addition, with the rod 39 of the fluid pressure cylinder 38 retracted, the first to third pins 32, 36, 40A are positioned on a straight line in the direction of the arrow CD. Similarly, with the rod 39 of the fluid pressure cylinder 38 retracted, these first to third pins 32, 36, 40B are positioned on a straight line in the direction of arrow CD.

  In such a configuration, by supplying air to the fluid pressure cylinder 38 and moving the rod 39 forward, one third pin 40A moves in the direction of arrow A in FIG. The other worn third pin 40B moves in the direction of arrow B. The movement of these third pins 40A, 40B causes the second pins 36, 36 to move in the direction of arrow D via the second arms 37A, 37B, so that the moving block 14 passes through the support blocks 35, 35. Then, it moves in the direction of arrow D against the elastic force of the compression coil spring 22. Accordingly, the suction pad 15 also moves integrally with the moving block 14 in the direction of arrow D by a distance L, and is positioned on the lower end side of the long hole 7a of the third cover 7 as shown by a two-dot chain line in the drawing. Hereinafter, the position of the suction pad 15 is referred to as “plate holding position” where the plate holder 13 holds the printing plate.

  On the other hand, when the supply of air to the fluid pressure cylinder 38 is stopped and the air pressure that advances the rod 39 is released, the fluid pressure cylinder 38 moves the moving block 14 in the direction of arrow D via the link devices 30A and 30B. Power is released. Therefore, the moving block 14 moves in the direction of arrow C by the urging force of the compression coil spring 22. As the moving block 14 moves, the suction pad 15 also moves by a distance L in the direction of the arrow C, and is positioned on the upper end side of the long hole 7a as shown by the solid line in FIG. Hereinafter, the position of the suction pad 15 is referred to as “plate insertion position” where the plate holder 13 inserts the printing plate into the holding side plate vise 2A of the plate cylinder 2.

  Next, the operation of inserting the printing plate into the plate vise of the plate cylinder in the plate holding apparatus configured as described above will be described. By previously retracting the rod 9a of the opening / closing fluid pressure cylinder 9, the third cover 7 is rotated in the counterclockwise direction in FIG. The window 3 a of the first cover 3 is closed by the third cover 7. Further, by supplying air to the fluid pressure cylinder 38 and moving the rod 39 forward, the suction pad 15 is positioned on the lower end side of the long hole 7a of the third cover 7 as shown by a two-dot chain line in FIG. As described above, the plate holder 13 is positioned at the “plate holding position”.

  After this state, the printing plate supplied to the plate cylinder 2 is gripped and moved in the direction of arrow C from the arrow D side so as to cover the third cover 7 in FIGS. 1 and 2, and on the holding side of the printing plate. The printing plate is temporarily positioned on the plate holder 13 by engaging positioning notches (both not shown) formed on the edge with the positioning pins 6. In this state, air in the suction pad 15 is sucked by an intake source (not shown), thereby sucking the printing plate onto the suction pad 15 and holding the printing plate in a state of being positioned on the plate holder 13.

  Next, the rod 9a of the opening / closing fluid pressure cylinder 9 is moved forward, whereby the third cover 7 is rotated clockwise around the support shaft 8 as shown in FIG. Approach the peripheral surface of the plate cylinder 2. In this state, the end surface on the holding side of the printing plate held by the plate holder 13 faces the holding side plate vise 2 </ b> A of the plate cylinder 2. Next, when the supply of air to the fluid pressure cylinder 38 is stopped and the air pressure for advancing the rod 39 is released, the moving block 14 is moved in the direction of arrow C by the urging force of the compression coil spring 22, and the plate holder 13 is moved to " Positioned at “plate insertion position”.

  The plate is moved by a distance L in the direction of arrow C integrally with the movement of the moving block 14, and the holding side end of the printing plate is inserted into the holding side plate vise 2 </ b> A of the plate cylinder 2. At this time, the movement of the moving block 14 in the arrow A-B direction is regulated by the guide members 25 provided at the left and right ends of the moving block 14, and the movement in the arrow C direction is guided. For this reason, since the moving block 14 goes straight without being skewed, the insertion amounts on the left and right of the holding side end of the printing plate inserted into the holding side plate vise 2A of the plate cylinder 2 are the same. When the holding side end portion of the inserted printing plate is rotated by the cam shaft of the plate cylinder 2 and is added to the holding side plate vise 2A, the suction of air in the suction pad 15 is stopped, and the printing by the plate holder 13 is performed. The plate is released. When the plate cylinder 2 is rotated approximately once, the printing plate is wound around the peripheral surface of the plate cylinder 2, and the end of the printing plate is inserted into the bottom plate vise 2B of the printing cylinder 2 to be printed. The plate is mounted on the peripheral surface of the plate cylinder 2.

  In this way, the movement of the moving block 14 is performed by the pair of link devices 30A and 30B and the single fluid pressure cylinder 38 interposed between the link devices 30A and 30B. The link devices 30A and 30B operate in synchronization. Therefore, the pair of second arms 37A and 37B pivotally attached to the plate holder 13 side operate in synchronization with each other, so that the plate holder 13 is not inclined and moves in the plate insertion direction (arrow C direction). Go straight. For this reason, since the holding amounts on the left and right of the printing plate added to the holding side plate vise 2A of the plate cylinder 2 are the same, it is possible to prevent defective printing and prevent the holding failure of the plate cylinder 2 to the holding side plate vise 2A. can do. Further, since the plate holder 2 is not skewed, wear generated between the plate holder 2 and the guide member 25 for guiding the plate holder 2 in the direction of the arrow CD can be reduced.

  FIG. 8 is a front view of an essential part showing a second embodiment of the present invention. In the second embodiment, the rod 39 of the fluid pressure cylinder 38 is extended in the direction of arrow A to provide the extended portion 50, and the cylinder end portion 41 is extended in the direction of arrow B to provide the extended portion 51. It is a thing. Further, the extended portions 50 and 51 and the moving block 14 are connected by the link devices 30A and 30B.

  As described above, the pair of link devices 30 </ b> A and 30 </ b> B are connected between the rod 39 of the fluid pressure cylinder 38 and the moving block 14 and between the cylinder end portion 41 and the moving block 14. Compared with the case where it connects by 30A, 30B, the skew of the movement block 14 can be controlled more reliably.

  In the present embodiment, the rod 39 and the cylinder end portion 41 of the fluid pressure cylinder 38 are pivotally attached to the third pins 40A, 40B. However, the first arm 33A, 33B or the second arm 37A, You may make it pivot to 37B. In addition, the moving block 14 is moved in the direction of arrow C by the urging force of the compression coil spring 22, but air is supplied to the fluid pressure cylinder 38 from two systems from the rod side and the cylinder end side. Thus, the compression coil spring 22 is not necessarily required if the rod 39 is moved forward and backward by supplying air.

It is a front view which shows the right half of the printing machine with which the plate holding | maintenance apparatus which concerns on this invention was applied. 1 is a front view showing a left half of a printing press to which a plate holding device according to the present invention is applied. FIG. 3 is a view taken along arrow III in FIG. 1. It is the IV-IV sectional view taken on the line in FIG. It is the VV sectional view taken on the line in FIG. It is the VI-VI sectional view taken on the line in FIG. It is a front view which shows the principal part of the plate holding | maintenance apparatus which concerns on this invention. It is a front view which shows the principal part of the 2nd Embodiment of this invention.

Explanation of symbols

  2 ... plate cylinder, 2A ... holding side plate vise, 7 ... third cover, 7a ... long hole, 13 ... plate holder, 14 ... moving block, 15 ... suction pad, 22 ... compression coil spring, 30A, 30B ... Link device, 32a ... First pin, 33A, 33B ... First arm, 36 ... Second pin, 37A, 37B ... Second arm, 38 ... Fluid pressure cylinder, 39 ... Rod, 40A, 40B ... 3rd pin, 41 ... cylinder end part, 50, 51 ... extension part.

Claims (3)

In a plate holding apparatus provided with a plate holder that is supported by a support member and moves between a plate holding position for holding the printing plate and a plate insertion position for inserting the printing plate into the plate cylinder,
A link comprising a first arm having one end pivotally attached to the support member side and a second arm having one end pivotally attached to the plate holder side, wherein the other end portions of these arms are pivotally attached. A pair of devices,
A plate holding device having a fluid pressure cylinder interposed between the link devices. The plate holding apparatus according to claim 1,
A plate holding apparatus comprising a guide member that regulates movement of the plate holder in the width direction and guides movement of the plate holder in the printing plate insertion direction. The plate holding apparatus according to claim 1,
A plurality of pairs of the first arm and the second arm are provided,
A plate holding apparatus characterized in that the fluid pressure cylinder is interposed between the plurality of pairs of arms.

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