JP2009286088A - Printing plate mounting device of sheet-fed offset printing press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and accurately mount a printing plate to the plate cylinder of an offset printing press. <P>SOLUTION: In a printing plate mounting device, the plate cylinder has: a plate head gripping vise 16 for gripping the plate head 14a of the printing plate 14; positioning pins 21 and 22 to fit in positioning holes formed at the plate head 14a; and a plate tail gripping vise 17 for gripping the plate tail 14b of the printing plate. At the start to wind the printing plate around the plate cylinder, the printing plate is past into a guide hole from the opposite side of the plate cylinder to the plate cylinder side, and then the positioning pins are fitted to the positioning holes at the plate head. When the plate tail is retained in a plate tail temporary retaining part, the printing plate bends vertically in an approximately S shape to be gripped the plate head by the plate head gripping vise. Then, a fitting roller thrusts the printing plate to the peripheral surface of the plate cylinder with the rotation of the plate cylinder. Finally, the printing plate is mounted to the plate cylinder by gripping the plate tail with the plate tail gripping vise. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for attaching a printing plate to a plate cylinder of an offset sheet-fed printing press.

  The offset sheet-fed printing press is provided with a number of plate cylinders corresponding to the number of printing colors, and a thin plate-shaped printing plate of each color is wound around each plate cylinder and fixed. When the plate cylinders of all colors are rotated, the color ink corresponding to each printing plate is supplied to each printing plate, and this ink is transferred to each blanket cylinder in contact with each printing cylinder. Each blanket cylinder is in contact with the impression cylinder, and the ink of the blanket cylinder is transferred to the paper passing between the blanket cylinder and the impression cylinder, and the paper sequentially passes between the blanket cylinder and the impression cylinder of each color, The image of the image line portion of each printing plate is printed on paper. Therefore, the positioning accuracy of the printing plate with respect to the plate cylinder has a great influence on the printing quality. If the printing plate is not attached to the plate cylinder with high accuracy, color registration shifts and the printing quality is deteriorated. The accuracy of color registration varies depending on the type of printed matter. For example, the allowable range of color registration is 50 μm to several hundred μm.

  In order to accurately attach the printing plate to the plate cylinder, the offset sheet-fed printing press is provided with a printing plate attachment device.

  This printing plate mounting apparatus has a printing plate holding frame in the vicinity of the printing section for each color, and a plate head setting vise for holding the printing plate head on the printing cylinder and positioning the printing plate head. A positioning pin for holding the plate and a plate vise holding vise for holding the plate edge of the printing plate. Further, a conforming roller for pressing the printing plate against the peripheral surface of the plate cylinder when the printing plate is wound around the peripheral surface of the plate cylinder is provided near the plate cylinder of each color. On the other hand, a positioning hole into which a positioning pin is fitted is formed in the plate head of the printing plate, and a bent portion is formed in the plate bottom. The positioning hole and the bent portion are formed before the printing plate is mounted on the plate cylinder.

  In order to wind the printing plate around the plate cylinder with this printing plate mounting device, first, the operator inserts the printing plate head between the upper and lower teeth of the printing plate preparation vise and applies the positioning hole to the positioning pin. Close the upper and lower teeth of the vise for preparing the print head and hold the print head between the upper and lower teeth. Further, the familiar roller is applied to the surface of the plate cylinder. Therefore, while slowly rotating the plate cylinder, the printing plate is pressed against the circumferential surface of the plate cylinder by the familiar roller, and finally the bent portion of the plate bottom of the plate plate is inserted between the upper and lower teeth of the plate bottom preparation vise. . When the bent part of the plate bottom enters between the upper and lower teeth of the plate bottom baring vise, the upper and lower teeth of the plate bottom baring vise are closed and the plate bottom is gripped between the upper and lower teeth. As a result, the printing plate is completely fixed to the plate cylinder, and then printing is started.

  However, even with the above plate mounting apparatus, the operator operates the plate head setting vise while keeping the positioning hole and positioning pin of the plate head in close contact, and accurately pinches the plate head between the upper and lower teeth. This is difficult, and the positioning hole of the plate head often deviates from the positioning pin in the middle of clamping the plate head between the upper and lower teeth. If the printing plate head is clamped while being shifted, the color registration shift occurs as described above. Further, when the operator strongly presses the printing plate against the positioning pin so that the positioning hole of the plate head does not deviate from the positioning pin, the positioning hole of the printing plate is largely recessed by the positioning pin. Since this dent amount increases every time the printing plate is attached to and detached from the plate cylinder, the printing accuracy is lowered.

  As a means for solving such a problem, the plate head is straightened against the lower teeth of the plate head preparation vise by pressing a support roller against the plate when the plate head of the printing plate is brought into contact with the positioning pin. Attempts have been made to press and hold the substrate (see, for example, Patent Document 1). That is, when the plate head is tilted without being perpendicular to the positioning pin when the plate head is gripped with a vise, the plate head is moved when the upper teeth move toward the lower teeth. When the upper teeth are moved relative to the lower teeth by pressing the support roller against the plate and keeping the plate head straight against the lower teeth of the plate head preparation vise It is intended to clamp the printing head with both upper and lower teeth while preventing the printing head from shifting.

  In addition, a guide member is installed in the vicinity of the plate vise holding vise at the time of mounting the printing plate, and this guide member is pressed against the printing plate so that the printing plate is curved convexly toward the printing plate side. Attempts have been made to press the printing plate straight against the lower teeth of the printing plate preparation vise (see, for example, Patent Document 2). This is also intended to clamp the printing plate head with the printing head preparation vise while the printing plate head is kept straight with respect to the lower teeth of the printing plate preparation vise at the time of clamping the printing plate head.

  In addition, the plate head of the printing plate is inserted between the upper and lower teeth of a vise-head preparation vise, and the printing plate is bent in the direction opposite to the plate cylinder and the plate edge is fixed on the floor of the printing machine. There has been proposed a method in which the plate head is brought into contact with the lower teeth of the plate head preparation vise by the elastic force of the printing plate (see, for example, Patent Document 3).

Japanese Patent Laying-Open No. 2001-171085 (FIG. 3) Japanese Patent No. 3817090 (FIG. 1) JP 2002-347212 A (FIG. 1)

  As described in Patent Document 1, even if the support roller is pressed against the printing plate to bring the printing plate head into contact with the lower teeth of the printing plate preparation vise, the printing roller is reversed by the support roller. Since there is a possibility that the positioning hole is separated from the positioning pin, there is a concern that the plate head may be clamped with a vise for holding the plate head while the positioning hole is separated from the positioning pin. If the operator tries to press the printing plate strongly against the positioning pin so that the positioning hole of the plate head does not move away from the positioning pin, there arises a problem that the positioning hole becomes large as described above. In general, it is difficult to secure the installation space for the support roller in an extremely narrow space near the plate cylinder.

  As described in Patent Document 2, even if the guide member is pressed against the printing plate to bring the plate head into contact with the lower teeth of the plate head preparation vise, the positioning hole of the plate head is positioned by the guide member. There is a possibility of separating from the pin, and there is a possibility that the plate head is clamped with a vise for holding the plate head while the positioning hole is separated from the positioning pin. There is a problem similar to the above in which the operator presses the printing plate toward the positioning pin so that the positioning hole of the plate head does not move away from the positioning pin. Further, since the space near the plate cylinder is extremely small, it is generally difficult to install the guide member.

  The method of fixing the plate bottom by curving the printing plate described in Patent Document 3 in the direction opposite to the plate cylinder is to use a vise for pretending the plate head while the positioning hole is away from the positioning pin. There is a risk of clamping. Further, since the printing plate is curved in the direction opposite to the plate cylinder, there is a problem that the space between the color printing portions of the printing press, that is, the space between the color units must be increased.

  Therefore, the present invention provides an offset that allows the printing plate to be attached to the plate cylinder with high accuracy by allowing the printing plate head to be clamped with the positioning hole of the printing plate plate being in close contact with the positioning pin. It is an object of the present invention to provide a plate mounting apparatus for a sheet-fed printing press.

  In order to solve the above problems, the present invention employs the following configuration.

  In order to facilitate understanding of the present invention, reference numerals in the drawings are given in parentheses, but the present invention is not limited thereto.

  According to the first aspect of the present invention, the printing plate holding frame (15) is connected to the printing unit (1, 2, 3, 4) from the vicinity of the plate cylinder (7) in the printing unit (1, 2, 3, 4). A plate head setting vise (16) provided to stand along the frame (10) and holding the plate head (14a) of the printing plate (14), and a positioning formed on the plate head (14a). The plate cylinder (7) includes positioning pins (21, 22) that fit into the holes (19, 20) and a plate bottom preparation vise (17) that holds the plate bottom (14b) of the printing plate (14). A conforming roller (18) that presses the printing plate (14) against the peripheral surface of the plate cylinder (7) when the printing plate (14) is wound around the peripheral surface of the plate cylinder (7) is provided in the machine frame (10). Plate for temporarily holding the plate bottom (14b) of the printing plate (14) in the vertical direction along the machine frame (10). A temporary holding portion (26) is provided above the printing plate holding frame (15), and a guide hole (23) into which the printing plate (14) is inserted from the plate head (14a) serves as the printing plate holding frame (15). When the winding of the printing plate (14) around the printing drum (7) is started, the printing plate (14) moves from the opposite side of the printing drum (7) to the printing drum (7). (23), the positioning pins (21, 22) are fitted into the positioning holes (19, 20) of the plate head (14a), and the plate bottom (14b) is inserted into the plate bottom temporary holding portion (26). The plate (14) is bent in a substantially S shape in the vertical direction, and the plate head (14a) is held by the plate head setting vise (16), and the plate cylinder (7). The plate (14) is pressed against the peripheral surface of the plate cylinder (7) by the conforming roller (18) while rotating, and then the plate bottom (14b) is raised. Wherein the printing plate by are suck the plate rear jaw for a vise (17) (14) is to be attached to the plate cylinder (7).

  As described in claim 2, in the plate mounting apparatus for an offset sheet-fed printing press according to claim 1, the plate bottom temporary holding part (26) is a machine of the printing part (1, 2, 3, 4). It can be attached to the frame (10).

  According to a third aspect of the present invention, in the printing plate mounting apparatus for the offset sheet-fed printing press according to the first or second aspect, the temporary plate bottom holding portion (26) appears in the plate holding frame (15). It can be attached as possible.

  As described in claim 4, in the plate mounting apparatus of the offset sheet-fed printing machine according to any one of claims 1 to 3, when the plate (14) is wound around the plate cylinder (7). Further, a guide member (25) for guiding the printing plate (14) between the guide hole (23) and the plate head preparation vise (16) is attached to the printing plate holding frame (15). be able to.

  As described in claim 5, in the plate mounting apparatus for an offset sheet-fed printing press according to any one of claims 1 to 4, the guide hole (23) is opened and closed in the plate holding frame (15). The opening / closing lid (24) to be attached may be attached.

  According to the first aspect of the present invention, the printing plate holding frame (15) is located near the plate cylinder (7) in the printing unit (1, 2, 3, 4) from the printing unit (1, 2, 3, 4). The plate head preparation vise (16) for holding the plate head (14a) of the printing plate (14) and the plate head (14a) are provided so as to stand up along the machine frame (10). A positioning pin (21, 22) that fits into the positioning hole (19, 20) and a plate bottom preparation vise (17) that holds the plate bottom (14b) of the printing plate (14) are the plate cylinder (7 ), And when the printing plate (14) is wound around the peripheral surface of the plate cylinder (7), a conforming roller (18) that presses the printing plate (14) against the peripheral surface of the plate cylinder (7) is provided with the machine frame (10). ) Temporarily holding the plate bottom (14b) of the printing plate (14) in the vertical direction along the machine frame (10) in the plate mounting apparatus of the offset sheet-fed printing press provided in A plate bottom temporary holding portion (26) is provided above the plate holding frame (15), and a guide hole (23) into which the plate (14) is inserted from the plate head (14a) has a plate holding portion. When the winding of the printing plate (14) around the plate cylinder (7) is started, the printing plate (14) is moved from the opposite side of the printing drum (7) to the printing drum (7) side. The positioning pin (21, 22) is inserted into the positioning hole (19, 20) of the plate head (14a) through the guide hole (23), and the plate bottom (14b) is used as the plate bottom temporary holding portion. When held by (26), the printing plate (14) is bent in a substantially S shape in the vertical direction, and the plate head (14a) is held by the plate head setting vise (16). The plate (14) is pressed against the peripheral surface of the plate cylinder (7) by the conforming roller (18) while rotating (7). The printing plate (14) is attached to the plate cylinder (7) by being fed to the above-mentioned vise for holding the plate edge (17), so that the printing plate (14) Can be applied to the positioning pins (21, 22) with the positioning holes (19, 20) of the plate head (14a) bent in an S-shape in the vertical direction. Accordingly, the positioning holes (19, 20) can be prevented from being deformed by bringing the positioning pins (21, 22) into contact with the positioning holes (19, 20) without applying a large force to the printing plate (14). Further, the plate head (14a) can be clamped with the positioning pins (21, 22) in close contact with the positioning holes (19, 20), and the printing plate (14) is attached to the plate cylinder (7) with high accuracy. be able to. Further, since the S-shape of the printing plate (14) extends in the vertical direction, it is not necessary to widen the space between the printing portions (1, 2, 3, 4) for each color.

  As described in claim 2, in the plate mounting apparatus for an offset sheet-fed printing press according to claim 1, the plate bottom temporary holding part (26) is a machine of the printing part (1, 2, 3, 4). When it is assumed that it is attached to the frame (10), the structure of the plate attachment device can be simplified.

  According to a third aspect of the present invention, in the printing plate mounting apparatus for the offset sheet-fed printing press according to the first or second aspect, the temporary plate bottom holding portion (26) appears in the plate holding frame (15). If it is attached, it can be pulled out onto the plate holding frame (15) when using the temporary plate bottom holding portion (26), and placed inside the plate holding frame (15) when not in use. You can avoid getting in the way of work.

  As described in claim 4, in the plate mounting apparatus of the offset sheet-fed printing machine according to any one of claims 1 to 3, when the plate (14) is wound around the plate cylinder (7). When the guide member (25) for guiding the printing plate (14) between the guide hole (23) and the plate head preparation vise (16) is attached to the printing plate holding frame (15), Since the plate (14) can be guided by the guide hole (23) and the guide member (25), the plate (14) can be smoothly wound around the plate cylinder (7).

  As described in claim 5, in the plate mounting apparatus for an offset sheet-fed printing press according to any one of claims 1 to 4, the guide hole (23) is opened and closed in the plate holding frame (15). When the opening / closing lid (24) is attached, the guide hole (23) is opened when the plate (14) is attached to the plate cylinder (7), and when the operation is not performed, the guide hole (23) is opened. By closing, it is possible to prevent the presence of the guide hole (23) from interfering with other operations.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  As illustrated in FIG. 1, the offset sheet-fed printing press includes printing units 1, 2, 3, and 4 for each color that are arranged in a line, and the most upstream side and the most downstream side of the printing units 1, 2, 3, and 4. Each side has a sheet feeder unit 5 and a delivery unit 6.

  The four printing sections 1, 2, 3, and 4 print inks of black, indigo, red, and yellow, respectively. The plate cylinder 7, the blanket cylinder 8, and the impression cylinder 9 that are adjacent to each other are placed in each machine frame 10. Have. Intermediate cylinders 11, 12, and 13 for sequentially transferring the sheet a from the upstream printing unit 1 to the downstream printing unit 4 are provided between the adjacent printing units 1, 2, 3, and 4.

  The sheets a are supplied one by one from the feeder unit 5 to the uppermost printing unit 1 and pass between the blanket cylinder 8 and the impression cylinder 9 of the printing unit 1 while being pressed. A printing plate 14 of the corresponding color is wound around the plate cylinder 7, and the ink accumulated on the image line portion of the printing plate 14 is once transferred to the surface of the blanket cylinder 8 and then transferred to the sheet a. As a result, an image of the corresponding color is printed on the sheet a. Thereafter, the sheet a is sequentially sent to the downstream printing units 2, 3 and 4, and images of other colors are overprinted. When the sheet a exits the most downstream printing unit 4, the printing is completed, and the delivery is performed. It is discharged to part 6.

  Prior to the above printing, it is necessary to attach the corresponding printing plate 14 to the plate cylinder 7 of each printing unit 1, 2, 3, 4 and a printing plate mounting apparatus for that purpose is attached to each printing unit 1, 2, 3, 4. Installed.

  Since the structure of the printing plate attachment device is the same among those attached to the printing units 1, 2, 3, 4, the printing plate attachment device attached to one printing unit 1 will be described.

  As shown in FIGS. 2 to 4, the printing plate mounting apparatus has a printing plate holding frame 15 for holding the printing plate 14 before being mounted on the plate cylinder 7 and a printing plate head that holds the printing plate head 14 a of the printing plate 14. A punching vise 16, positioning pins 21 and 22 that fit into positioning holes 19 and 20 formed in the plate head 14 a, and a plate bottom preparation vise 17 that holds the plate bottom 14 b of the printing plate 14; A conforming roller 18 that presses the printing plate 14 against the peripheral surface of the plate cylinder 7 is included.

  As shown in FIG. 1, the printing plate holding frame 15 is disposed so as to stand along the machine frame of the printing unit 1 from the vicinity of the plate cylinder 7 in the printing unit 1.

  As shown in FIGS. 2 and 3, the plate holding frame 15 has vertical and horizontal frames assembled in a rectangular shape. The pair of vertical frames 15 a and 15 a are arranged at intervals longer than the length of the printing plate 14 and longer than the width of the printing plate 14. The plate holding frame 15 is detachably attached to the machine frame of the printing unit 1. 2 and 3, reference numerals 15 c and 15 c denote connecting shafts for connecting to the machine frame of the printing unit 1.

  The lower horizontal frame 15 b of the printing plate holding frame 15 is disposed slightly below the plate cylinder 7, and the upper horizontal frame 15 d is disposed at a position higher than the plate cylinder 7. An intermediate frame 15e is provided slightly below the upper horizontal frame 15d in parallel with the upper and lower horizontal frames 15d and 15b. A slot between the intermediate frame 15e and the upper horizontal frame 15d serves as a guide hole 23 into which the printing plate 14 is inserted from the plate head 14a. The surface of the edge of the guide hole 23 is preferably formed of a cushioning material such as rubber so as not to damage the printing plate 14.

  As shown in FIG. 2, an opening / closing lid 24 for opening / closing the guide hole 23 is attached to the printing plate holding frame 15. The opening / closing lid 24 opens the guide hole 23 when the plate 14 is attached to the plate cylinder 7 and closes the guide hole 23 when the operation is not performed. The opening / closing lid 24 can be linked to the opening / closing operation of the guide member 25 by being connected to a guide member 25 described later via a link device (not shown).

  As shown in FIGS. 2 and 3, above the plate holding frame 15, the plate bottom temporary holding that temporarily holds the plate bottom 14 b of the printing plate 14 in the vertical direction along the machine frame of the printing unit 1. A portion 26 is provided. A concave portion 26a into which the plate bottom 14b is fitted is formed in the plate bottom temporary holding portion 26 in a groove shape. The plate bottom 14b fits into the recess 26a, but can be easily detached from the recess 26a when the printing plate 14 is pulled downward.

  The temporary plate bottom temporary holding portion 26 is arranged in parallel to the upper horizontal frame 15d and is connected to the upper horizontal frame 15d via stays 27 and 27. The plate bottom temporary holding portion 26 is attached to the plate holding frame 15 so as to be able to appear and retract. That is, the stays 27 and 27 are slidable in the vertical direction with respect to the upper horizontal frame 15d, and when using the temporary plate edge holding portion 26, the stays 27 and 27 slide upward so that the plate holding frame When not in use, the stays 27 and 27 are slid downward to be stored on the plate holding frame 15 side. Thereby, the plate bottom temporary holding portion 26 can be prevented from interfering with other work when the plate bottom temporary holding portion 26 is not used.

  As shown in FIG. 1, the plate bottom temporary holding unit 26 can be replaced with a handle 28 attached to the machine frame of the printing unit 1. The handle 28 is attached to a cover (not shown) of the printing unit 1 and is used by an operator to open and close the cover.

  As shown in FIGS. 2 and 3, a guide member 25 of the printing plate 14 is attached to the printing plate holding frame 15. The guide member 25 is connected to the printing plate holding frame 15 so as to be able to appear and retract. Specifically, the guide member 25 is connected to the printing plate holding frame 15 through a horizontal pivot 25a and a cylinder / piston device 25b. When the printing plate 14 is wound around the plate cylinder 7, the guide member 25 protrudes between the guide hole 23 and the plate head preparation vise 16 by the extending operation of the cylinder / piston device 25b. After the mounting is completed, the guide member 25 is submerged in the plate holding frame 15 by the contraction operation of the cylinder / piston device 25b. Since the guide member 25 protrudes between the guide hole 23 and the plate head preparation vise 16 when the printing plate 14 is mounted, the guide member 25 guides the printing plate 14 together with the guide hole 23. The plate 14 is smoothly wound around the plate cylinder 7. The surface of the guide member 25 is formed of a cushioning material such as rubber as necessary so as not to damage the printing plate 14.

  As shown in FIG. 2, a plate head setting vise 16 for holding the plate head 14a of the printing plate 14, positioning pins 21 and 22 fitted into positioning holes 19 and 20 formed in the plate head 14a, and the printing plate A plate-assist vise 17 for holding 14 plate-ass 14 b is provided on the plate cylinder 7.

  The plate head setting vise 16 and the plate bottom setting vise 17 include upper teeth 16a and 17a and lower teeth 16b and 17b, respectively. The lower teeth 16b and 17b are fixed in the vicinity of the surface of the plate cylinder 7 and extend longer than the width of the printing plate 14 in the generatrix direction of the surface of the plate cylinder 7. The upper teeth 16a and 17a are rotated by an actuator (not shown) such as a cylinder / piston device, and can be brought into contact with and separated from the lower teeth 16b and 17b by rotating. The upper teeth 16a of the plate head preparation vise 16 extend in parallel with the lower teeth 16b, but are interrupted at locations corresponding to the positioning pins 21 and 22, as shown in FIGS. Since the positioning pin is not provided at the position of the plate edge preparation vise 17, the upper teeth 17 a extend along the lower teeth 17 without interruption.

  A pair of positioning pins 21 and 22 are fixed on the lower teeth 16b along the length thereof, and protrude in the vertical direction with respect to the upper teeth 16a and the lower teeth 16b in a closed state. The positioning pins 21 and 22 are both shown as cylindrical shapes in FIGS. 4A and 4B, but one of them can be a prismatic shape. The positioning pins 21 and 22 are provided at the same location between the plate cylinders 7 of the respective colors.

  As shown in FIGS. 4A and 4B, positioning holes 19 and 20 are formed in advance in the plate head 14a of the printing plate 14 corresponding to the positioning pins 21 and 22, respectively. The positioning holes 19 and 20 are formed in the same place and the same shape and size between the printing plates 14 of the respective colors. As shown in FIG. 4 (A), when the operator applies the edge of the plate head 14a of the plate 14 to the positioning pins 21 and 22 and slightly shifts the plate 14 in the axial direction of the plate cylinder 7, As shown in FIG. 4B, the positioning pins 21 and 22 are fitted into the positioning holes 19 and 20, and the side surfaces of the positioning pins 21 and 22 come into contact with the edges of the positioning holes 19 and 20. In this state, the position of the printing plate 14 on each plate cylinder 7 coincides between the colors.

  As shown in FIG. 2, when starting to wind the printing plate 14 around the plate cylinder 7, the printing plate 14 is passed through the guide hole 23 from the opposite side of the plate cylinder 7 to the plate cylinder 7 side, and the plate head 14a. When the positioning pins 21 and 22 are fitted in the positioning holes 19 and 20 and the plate bottom 14b is held by the temporary plate bottom holding portion 26, the plate 14 bends in a substantially S shape in the vertical direction. Thereby, the elastic force generated in the printing plate 14 urges the printing plate head 14a of the printing plate 14 to the positioning pins 21 and 22 with an appropriate force, and the positioning pins 21 and 22 are inserted into the positioning holes 19 and 20 of the printing plate 14a. The close contact state is maintained until the upper teeth 16a have finished rotating to the lower teeth 16b in the plate head preparation vise 16. As a result, the printing plate head 14a is clamped between the upper and lower teeth 16a, 16b of the printing plate preparation vise 16 without causing a positional shift.

  As shown in FIG. 2, a bent portion for clamping between the upper and lower teeth 17 a and 17 b of the plate tail holding vise 17 is formed in advance on the plate bottom 14 b of the printing plate 14. The bent portions are also formed to have the same size between the printing plates 14 of the respective colors. The plate head 14a is picked up by the plate head preparation vise 16, the printing plate 14 is pressed against the peripheral surface of the plate drum 7 while the plate drum 7 rotates, and then the bent portion of the plate bottom 14b. Is clamped between the upper and lower teeth 17a and 17b of the plate edge preparation vise 17, and the attachment of the printing plate 14 to the plate cylinder 7 is completed.

  A conforming roller 18 that presses the printing plate 14 against the peripheral surface of the plate cylinder 7 is installed in the machine frame of each printing unit 1, 2, 3, 4. As shown in FIG. 2, the conforming roller 18 is provided so as to be able to contact the circumferential surface of the plate cylinder 7 slightly below the axis of the plate cylinder 7. The conforming roller 18 is supported, for example, at the tip of the rotation lever 18a, and can contact the circumferential surface of the plate cylinder 7 by the rotation of the rotation lever 18a. The surface of the conforming roller 18 is formed of a cushioning material such as rubber so as not to damage the printing plate 14.

  Next, the operation of the plate mounting apparatus having the above configuration will be described.

  (1) When the printing plate 14 is attached to the plate cylinder 7, the operator operates a button on a control panel (not shown) to extend the piston / cylinder device 25b as shown in FIG. Projecting between the guide hole 23 and the plate head preparation vise 16. In conjunction with this, the opening / closing lid 24 also rotates to open the guide hole 23.

  Further, by the same button operation, the upper teeth 16a, 17a are separated from the lower teeth 16b, 17b in the plate head preparation vise 16 and the plate tail preparation vise 17, and the upper and lower teeth 16a, 17a, 16b, Open between 17b. Further, the plate bottom temporary holding portion 26 is pulled out above the plate holding frame 15 by manual work or the like.

  (2) An operator holds the printing plate 14 and passes the plate head 14a of the printing plate 14 from the opposite side of the plate cylinder 7 to the plate cylinder 7 through the guide hole 23, as shown in FIG. The edge of the plate head 14 a of the printing plate 14 is brought into contact with the positioning pins 21 and 22. Therefore, when the operator further shifts the printing plate 14 slightly in the axial direction of the plate cylinder 7, the positioning pins 21 and 22 are fitted into the positioning holes 19 and 20 as shown in FIG. The side surfaces of the positioning pins 21 and 22 come into contact with the edges of 19 and 20.

  (3) As shown in FIG. 5, the operator inserts the plate bottom 14 b of the printing plate 14 into the recess 26 a of the plate bottom temporary holding portion 26. As a result, the printing plate 14 is bent in a substantially S shape in a substantially vertical direction, and the elastic force generated in the printing plate 14 urges the plate head 14a of the printing plate 14 to the positioning pins 21 and 22 with an appropriate force. As a result, the positioning pins 21 and 22 are brought into close contact with the positioning holes 19 and 20 of the plate head 14a, and the state is maintained. Since the printing plate 14 is urged to the positioning pins 21 and 22 with an appropriate force, the positioning holes 19 and 20 are not plastically deformed.

  (4) With the contact between the positioning holes 19 and 20 and the positioning pins 21 and 22 maintained, the operator operates a button on a control panel (not shown), and as shown in FIG. The upper teeth 16a in the vise 16 are rotated to the lower teeth 16b. As a result, the printing plate head 14a is clamped to the printing plate preparation vise 16 without causing positional displacement.

  (5) The operator operates a button on the control panel to cause the conforming roller 18 to protrude to the peripheral surface of the plate cylinder 7 as shown in FIG.

  (6) The operator operates a button on the control panel to rotate the plate cylinder 7 at a low speed in the direction of the arrow as shown in FIG. Along with this, as shown in FIG. 7, the printing plate 14 is wound around the plate cylinder 7 while being pressed against the peripheral surface of the plate cylinder 7 by the conforming roller 18. In the meantime, the printing plate 14 moves to the peripheral surface of the plate cylinder 7 while being guided by the guide hole 23 and the guide member 25 of the printing plate holding frame 15 with the printing plate bottom 14b being detached from the plate holding temporary holding portion 26. To do.

  (7) When the plate cylinder 7 further rotates and the plate bottom 14b reaches the position of the plate bottom preparation vise 17, the bent portion of the plate bottom 14b is used for plate bottom preparation as shown in FIG. It enters between the upper and lower teeth 17a, 17b of the force 17.

  (8) Then, when the operator operates the button to rotate the upper teeth 17a of the plate edge preparation vise 17 to the lower teeth 17b, as shown in FIG. 9, the plate edge moves to the upper and lower teeth 17a, 17b. Clamped between.

  Thus, the attachment of the printing plate 14 to the plate cylinder 7 is completed.

  By performing the same operation sequentially or in parallel in each printing unit, the printing plates 14 of all colors are mounted on the plate cylinders 7 of the printing units 1, 2, 3, and 4.

  As described above, since the positioning holes 19 and 20 of the plate head 14a are in close contact with the positioning pins 21 and 22 in the printing plate 14 of each color, the position of the printing plate 14 on each printing cylinder 7 is the printing of each color. The versions 14 agree with each other.

  (9) As shown in FIG. 9, the cylinder / piston device 25 b is contracted to rotate the guide member 25 and the opening / closing lid 24 toward the plate holding frame 15, and the guide member 25 is moved to the plate holding frame 15. The guide hole 23 is closed with the opening / closing lid 24. Further, the plate bottom temporary holding portion 26 is stored in the plate holding frame 15.

  (10) Thereafter, printing is started. As shown in FIG. 1, when the sheet a is fed out from the feeder unit 5 and sequentially sent to the printing units 1, 2, 3, and 4, the sheet a is printed on the sheet a. An image without color misregistration that matches the color registration is printed and discharged to the delivery unit 6.

  In addition, this invention is not limited to the said embodiment, A various change is possible within the range of the summary of this invention.

It is a schematic front view which shows an example of the offset sheet-fed printing press provided with the printing plate mounting apparatus which concerns on this invention. It is a vertical sectional view of the plate mounting apparatus. In FIG. 1, it is a III-III direction arrow directional view of a printing plate mounting apparatus. FIG. 2 is a diagram illustrating a positional relationship between a printing plate and a plate cylinder at the start of mounting of the printing plate, (A) is a diagram illustrating a state in which the edge of the plate head of the printing plate is brought into contact with a positioning pin, and (B) is a diagram of the plate head It is a figure which shows the state which clamped the printing head with the upper and lower teeth of the printing head preparation vise after applying the positioning pin to the positioning hole. FIG. 3 is a view seen from the same direction as FIG. 2 showing a first stage of plate mounting. FIG. 3 is a view seen from the same direction as FIG. 2 showing a second stage of plate mounting. It is the figure seen from the same direction as FIG. 2 which shows the 3rd step of plate mounting. It is the figure seen from the same direction as FIG. 2 which shows the 4th step of plate mounting. FIG. 3 is a view seen from the same direction as FIG. 2 showing the completion of plate mounting.

Explanation of symbols

1, 2, 3, 4 ... Printing section 7 ... Plate cylinder 10 ... Machine frame 14 ... Printing plate 14a ... Plate head 14b ... Plate bottom 15 ... Printing plate holding frame 16 ... Plate head preparation vise 17 ... Plate bottom plate Application vise 18 ... Familiar roller 19, 20 ... Positioning hole 21, 22 ... Positioning pin 23 ... Guide hole 24 ... Opening / closing lid 25 ... Guide member 26 ... Temporarily holding plate bottom

Claims (5)

  A printing plate holding frame is provided so as to stand up along the machine frame of the printing unit from the vicinity of the plate cylinder in the printing unit, and is formed on the plate head for holding the plate head of the printing plate. The plate cylinder is provided with a positioning pin that fits into the positioning hole, and a plate vise holding vise that holds the plate edge of the printing plate, and when the printing plate is wound around the circumferential surface of the plate cylinder, the printing plate is In a printing plate mounting apparatus for an offset sheet-fed printing machine, in which a conforming roller that presses against the peripheral surface is provided in the machine frame, a plate edge temporary holder that temporarily holds the plate edge of the printing plate in the vertical direction along the machine frame. A holding portion is provided above the plate holding frame, a guide hole into which the plate is inserted from the plate head is provided in the plate holding frame, and when starting to wind the plate around the plate cylinder, The plate is passed through the guide hole from the opposite side of the plate cylinder to the plate cylinder side, and the positioning pin is fitted into the positioning hole on the plate head. When the plate bottom is held by the plate bottom temporary holding portion, the printing plate bends in a substantially S shape in the vertical direction, and the plate head is raised by the above-mentioned plate head setting vise, and the plate cylinder The printing plate is pressed against the peripheral surface of the plate cylinder by the conforming roller while rotating, and then the printing plate is attached to the plate cylinder by the plate bottom being raised by the above-described vise for vice versa. A plate mounting apparatus for an offset sheet-fed printing machine.   2. The plate mounting apparatus for an offset sheet-fed printing press according to claim 1, wherein a temporary plate-tail holding unit is mounted on a machine frame of the printing unit.   3. A press plate attachment apparatus for an offset sheet-fed printing press according to claim 1 or 2, wherein the temporary plate bottom holding portion is attached to the plate holding frame so as to be able to appear and retract. Plate mounting equipment.   4. The printing plate mounting apparatus for an offset sheet-fed printing press according to claim 1, wherein when the printing plate is wound around the plate cylinder, between the guide hole and the plate head setting vise. A plate attachment device for an offset sheet-fed printing machine, wherein a guide member for guiding the plate is attached to a plate holding frame.   5. A plate attachment apparatus for an offset sheet-fed printing machine according to claim 1, wherein an opening / closing lid for opening and closing the guide hole is attached to the plate holding frame. Plate mounting device for printing press.

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