JP4737759B2 - Plate positioning method and apparatus for rotary offset printing press - Google Patents

Description

  The present invention relates to a printing plate positioning method and apparatus employing a pin register system suitable for an offset rotary printing press, and more particularly, a newspaper offset rotary printing press. It is possible to prevent the deformation of the notch groove provided in the portion.

Conventionally, development of a plate attaching / detaching apparatus for attaching / detaching a printing plate to / from a printing drum such as an offset rotary printing press or an offset sheet-fed press has been promoted, and almost complete automation has become possible.
For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2005-161818), a long hole that extends in the axial direction of the plate cylinder and has an opening on the outer surface of the plate cylinder when the printing plate is mounted on the plate cylinder. An apparatus is disclosed in which the subsequent mounting process and removal process are almost completely automated except when the holding portion at one end of the printing plate is manually engaged.

However, in a newspaper web offset press, the number of printing units, that is, the printing plate cylinders is large, and the width of the plate cylinders is usually 4 pages. The workability is bad.
In addition, since the number of printing plate cylinders is large and the width of the plate cylinder is usually 4 pages, it is necessary to install an automatic detaching device with a complicated structure due to space constraints, cost and maintenance inspection. Have difficulty.

  Therefore, as disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2003-145707), a newspaper offset rotary press has conventionally adopted a pin register system that has a simple configuration and enables accurate positioning. This method uses a pin hole provided in the printing plate to fit a register pin (positioning block) in the plate cylinder to obtain a reference position. In newspaper web offset presses, this method was almost done manually. Usually, the register pin attached to the plate cylinder is fixed, and the method of adjusting the registration deviation is performed by moving the plate cylinder itself.

  A method of attaching and detaching the printing plate using this pin register system will be described with reference to FIG. In FIG. 6, a long hole (not shown) is formed in the plate cylinder 01 so as to extend in the axial direction and has an opening 02 on the surface of the plate cylinder, and when the plate 03 is mounted on the plate cylinder 01. A holding portion 04 formed at one end of the printing plate 03 is inserted into the opening 02 and locked in the elongated hole.

  A plate pressing roller 08 is provided on the surface of the plate cylinder 01 in the axial direction of the plate cylinder. The holding portion 04 of the printing plate 03 is fixed to the long hole, and the printing plate 03 is pressed against the plate cylinder surface by the plate pressing roller 08. In this state, the plate cylinder 01 is rotated once to wind the printing plate 03 around the surface of the plate cylinder 01. When the plate cylinder 01 is rotated once, the holding edge 05 formed at the other end of the printing plate 03 reaches the position of the opening 02, and the holding edge 05 is pushed by the plate holding roller 08 to be provided in the holding portion 05. The notch groove 07 is fitted to a register pin 06 provided near the opening 02 of the plate cylinder 01. As a result, the printing plate 03 is positioned with respect to the plate cylinder 01.

Thereafter, the holding bottom 05 is locked and fixed to the plate cylinder 01 inside the elongated hole by a locking and fixing device provided inside the elongated hole (not shown), whereby the printing plate 03 is mounted on the plate cylinder 01.
When the printing plate 03 is removed from the plate cylinder 01, the holding bottom 05 of the printing plate 03 is removed from the fixing device provided in the long hole of the printing drum 01, and then the printing drum 01 is removed. After one rotation, the plate 03 is removed from the gripper 05 side, and finally the gripper 04 is manually removed from the locking part of the opening 02.

  In addition, the semi-automatic printing plate loading and unloading device equipped with the plate pressing roller 08 is usually installed in a commercial offset rotary printing press or an offset sheet-fed printing press. In a newspaper offset rotary printing press, space restrictions, Due to cost and maintenance and other restrictions, the plate pressing roller 08 was not equipped, and the plate was attached and detached almost manually.

Japanese Patent Laid-Open No. 2005-161818 JP 2003-145707 A

  However, in the positioning method by the pin register system using the above-described conventional semi-automatic plate changer, when the printing plate 03 is wound around the plate cylinder 01, due to the dimensional accuracy of the printing plate 03, poor mounting of the holding portion 04, etc., FIG. As shown, the position of the cutout groove 07 of the gripper end 05 may be displaced with respect to the register pin 06 in some cases.

  In this state, when the holding edge 05 of the printing plate is pushed by the plate pressing roller 08, the notch groove 07 collides with the chamfered portion (inclined surface provided at the corner on the end side) 06a of the register pin 06. Since the plate pressing roller 08 is in contact with the gripper bottom 05 over the entire width of the plate cylinder 01, the friction against the lateral movement shown in FIG. 7 is strong, and the gripper bottom 05 is chamfered on the register pin 06. It cannot move in the lateral direction (width direction of the plate cylinder 01) along the portion 06a.

  Therefore, the contact portion of the side edge 07a of the notch groove 07 is deformed so as to follow the inclined surface of the chamfered portion 06a of the register pin 06. Once the cutout groove 07 is deformed, there is a problem in that the fitting portion with the register pin 06 is free to play, and accurate positioning cannot be performed.

  In view of the problems of the prior art, the present invention fits a notch groove to a register pin without causing the deformation of the notch groove when the printing plate is positioned on the plate cylinder by the pin register system in an offset rotary printing press. An object of the present invention is to realize a positioning method and apparatus capable of accurately positioning a printing plate.

In order to achieve the above object, the printing plate positioning method of the present invention comprises:
After the holding portion formed at one end of the printing plate is locked in a long hole formed in the axial direction of the plate cylinder and having an opening on the outer surface of the plate cylinder,
The plate is wound around the plate cylinder by rotating the plate cylinder once while pressing the plate with a plate pressing roller provided facing the surface of the plate cylinder,
A printing plate of an offset rotary printing press that positions the printing plate on the plate cylinder by fitting a notch groove formed on the other end of the printing plate to a register pin provided on the surface of the printing drum. In the positioning method,
The cylindrical portion of the portion that contacts the notch groove of the plate pressing roller is formed to have a larger diameter than other cylindrical portions,
By pressing the holding lip of the printing plate with the plate pressing roller, the cutting lip is bent in the direction of expanding the opening of the notch groove with the notch groove where the large-diameter portion hits as a base point. It fits into the register pin.

  In the method of the present invention, the cylindrical portion of the plate pressing roller that is in contact with the cutout groove is formed to have a larger diameter than the other cylindrical portions. Curved in a direction to widen the opening. Therefore, even if there is a slight misalignment in the lateral direction between the notch groove and the register pin, the notch groove is used as the register pin without absorbing the misalignment amount by expanding the opening and causing deformation of the side of the notch groove. Can be fitted.

  The printing plate is made of a thin and low rigidity material such as an aluminum plate. The amount of expansion of the opening of the notch groove varies depending on the difference in radius between the large diameter portion of the plate pressing roller and the other cylindrical portion, the length of the plate pressing roller, the rigidity of the gripping edge, etc. According to the verification, etc., when the gripper end is pushed with a plate pressing roller having a large diameter portion at a corresponding position of the notch groove, the opening of the notch groove is widened in units of 0.01 to 0.04 mm, and the register pin and the notch groove Since the maximum clearance is 0.045 mm, the opening of the notch groove has a maximum margin of 0.085 mm with respect to the register pin. On the other hand, the amount of deviation a between the notch groove and the register pin is usually 0.01 to 0.08 mm, and therefore a spread amount that can sufficiently absorb the normal amount of deviation can be obtained.

  On the other hand, the size of the opening of the notch groove and the size of the register pin are not finely measured in the micron unit because there is some play in the fitting part and accurate positioning of the printing plate is not possible. Even if there is a gap, hitting and biting occur between the two.

  Further, by providing a large diameter portion on the plate pressing roller, the gripper bottom receives a force from the plate pressing roller only at a portion where the large diameter portion is in contact with the gripping bottom. On the other hand, when the notch groove comes into contact with the register pin, a moment to avoid the register pin acts on the contact part on the side of the notch groove, but the gripper edge receives the force from the plate pressing roller as described above. Since the large-diameter portion is only the portion that is in contact with the gripper buttocks, the contact portion of the notch groove is easily moved in the lateral direction.

That is, since the large diameter portion of the plate pressing roller that comes into contact with the gripper bottom is relatively short, the frictional force against the lateral movement of the gripper bottom is weak, and the contact portion of the notch groove easily moves in the horizontal direction. As a result, even if the notch groove comes into contact with the register pin, it moves in the lateral direction, and deformation of the side of the notch groove can be avoided.
The length of the large-diameter portion needs to be at least the opening length of the notch groove.

Preferably, if the end corners that contact the opening ends of the notch grooves of the register pin are chamfered to form an inclined surface that descends outward, the notch when the gripper edge of the printing plate is pressed by the plate pressing roller Even if there is a deviation in the positional relationship between the groove and the register pin, the opening end of the notch groove is applied to the chamfered portion, and sliding along the inclined surface of the chamfered portion makes it easier to move the notched groove further in the lateral direction. For this reason, the cutout groove can be easily fitted to the register pin without causing side deformation.
As described above, the amount of deviation that normally occurs between the notch groove and the register pin is 0.01 to 0.08 mm. Therefore, if the width of the chamfered portion is 1 mm or more, the opening end of the notched groove is applied to the chamfered portion. be able to.

In the method of the present invention, preferably, the side connecting the opening and the bottom of the notch groove is formed by an inclined side forming an opening widened outward and a vertical side connecting the inclined side and the base. If the notch groove is guided to the fitting position with the register pin by sliding the inclined side against the end of the register pin, even if a slight deviation occurs between the notch groove and the register pin. The notch groove is smoothly fitted to the register pin, and the side of the notch groove is not deformed.
In this way, after the lateral shift between the notch groove and the register pin is absorbed by the inclined side, an accurate fit is formed by forming a fit without play between the vertical side of the notch groove and the register pin.

  Further, the chamfered portion is formed on the register pin, the inclined side is formed on the side of the notch groove, and the inclined angle of the inclined surface of the chamfered portion is equal to the inclined angle of the inclined side. The load applied to the inclined side of the notched groove is evenly distributed, and therefore, the lateral movement of the notched groove is prevented without causing the deformation of the inclined side and by sliding the inclined side of the chamfered portion. It is performed more smoothly.

Further, in the method of the present invention, after the holding portion formed at one end of the printing plate is locked in a long hole formed in the axial direction of the plate cylinder and having an opening on the outer surface of the plate cylinder,
The plate is wound around the plate cylinder by rotating the plate cylinder once while pressing the plate with a plate pressing roller provided facing the surface of the plate cylinder,
A printing plate of an offset rotary printing press that positions the printing plate on the plate cylinder by fitting a notch groove formed on the other end of the printing plate to a register pin provided on the surface of the printing drum. In the positioning method,
The plate pressing roller has at least a cylindrical portion in contact with the printing plate having the same diameter, and when the printing plate is wound around the printing drum, the first pressing roller is configured to press the printing plate against the printing drum. The cylindrical portion of the portion that contacts the notch groove of the butt is formed to have a larger diameter than the other cylindrical portions, and the butt for attaching the holding butt of the printing plate is held when the notched groove is fitted to the register pin. And 2 plate pressing rollers.

Further, the printing plate positioning apparatus of the present invention is provided with an elongated hole formed in the axial direction and having an opening on the outer surface , a gripping portion formed at one end, and a gripping butt formed at the other end. A plate cylinder having a register pin projecting from the outer surface at a position where the notched groove of the printing plate hits, and a plate pressing roller provided facing the surface of the plate cylinder,
In a printing plate positioning apparatus of an offset rotary printing press that positions the printing plate on the plate cylinder by fitting a notch groove on the gripping end with a register pin of the printing drum,
The cylindrical portion of the portion that contacts the notch groove of the plate pressing roller is formed to have a larger diameter than other cylindrical portions,
The holding edge of the printing plate is pressed by the plate pressing roller and the large diameter portion is applied to the notch groove of the holding edge so that the opening edge of the notch groove is expanded from the notch groove. The notch groove is configured to be fitted to the register pin while being bent.

  In the apparatus according to the present invention, when the printing plate is mounted on the plate cylinder, the holding portion of the printing plate is first locked in the opening portion of the long hole provided in the axial direction of the plate cylinder, and then the plate pressing roller is used. When the printing plate is pressed once on the surface of the plate cylinder, and finally the notch groove on the end of the plate provided at the end of the printing plate is fitted to the register pin protruding from the surface of the plate cylinder, the large diameter In order to fit the notch groove to the register pin while curving the notch groove in the direction of expanding the opening of the notch groove with the notch groove as a starting point by hitting the notch groove on the notch groove of the notch Even if there is a lateral misalignment between the groove and the register pin, the amount of misalignment can be absorbed by expanding the opening of the notch groove, so that the notch groove is registered without causing deformation on the side of the notch groove. Can be fitted to a pin.

  Further, as described above, since the contact portion between the plate pressing roller and the holding portion is a relatively short large-diameter portion, the frictional force against the lateral movement of the holding butt is weak, so that the holding butt Since it becomes easy to move in the lateral direction, it is possible to further easily eliminate the lateral displacement between the notch groove and the register pin.

  According to the method and the device of the present invention, the cylindrical portion of the portion of the plate pressing roller that contacts the notch groove is formed to have a larger diameter than the other cylindrical portions, and the gripping edge of the printing plate is pressed by the plate pressing roller. The notch groove is fitted to the register pin while curving the gripping butt in a direction to widen the opening of the notch groove with the notch groove hitting the large diameter portion as a starting point. Since the lateral opening between the cutout groove and the register pin can be absorbed by the opening expansion, the cutout groove can be fitted to the register pin without causing deformation of the side of the cutout groove.

  Preferably, the end corner of the register pin that contacts the opening end of the notch groove is chamfered to form an inclined surface that descends outward, and the notch of the notch groove is pressed by pressing the holding edge of the printing plate with a plate pressing roller. When the open end is applied to the chamfered portion and the open end is slid along the inclined surface of the chamfered portion so that the cutout groove is fitted to the register pin, the cutout groove is fitted to the register pin. It becomes easier.

  Preferably, the side connecting the opening and the bottom of the notch groove is formed by an inclined side that forms an opening that widens outward and a vertical side that connects the inclined side and the base, If the notch groove is guided to the fitting position with the register pin, the notch groove can be more easily fitted to the register pin.

Also , an elongated hole formed in the axial direction and having an opening on the outer surface, a gripping portion is formed at one end, a gripping butt is formed at the other end, and a notch groove of the printing plate provided at the gripping butt hits A plate cylinder having a register pin protruding from the outer surface of the position, and a plate pressing roller provided to face the surface of the plate cylinder,
In a printing plate positioning apparatus of an offset rotary printing press that positions the printing plate on the plate cylinder by fitting a notch groove on the gripping end with a register pin of the printing drum,
The plate pressing roller has at least a cylindrical portion in contact with the printing plate having the same diameter, and when the printing plate is wound around the printing drum, the first pressing roller is configured to press the printing plate against the printing drum. The cylindrical portion of the portion that contacts the notch groove of the butt is formed to have a larger diameter than the other cylindrical portions, and the butt for attaching the holding butt of the printing plate is held when the notched groove is fitted to the register pin. If the structure is provided with two plate pressing rollers, the method of the present invention can be automated.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the present invention to that only, unless otherwise specified.
FIG. 1 is a schematic view showing a fitting portion between a notch groove and a register pin of a first embodiment of the present invention, FIGS. 2 and 3 are explanatory views showing a deformation state of the notch groove in a comparative example, and FIG. FIG. 5 is an explanatory view showing the presence or absence of deformation of the notch groove in the first embodiment, and FIG. 5 is a schematic diagram of the second embodiment of the present invention.

  FIG. 1 showing a first embodiment of the present invention shows a register pin 6 in which a printing plate is wound around a plate cylinder by the above-described method, and a holding edge 5 formed at the end of the printing plate protrudes from the surface of the plate cylinder. The part to be fitted is shown. The register pin 6 is provided in the axial center of the plate cylinder in the vicinity of the locking opening, which is an elongated hole extending in the axial direction of the printing cylinder and having a locking opening on the surface of the plate cylinder. .

  When the plate is wound around the plate cylinder, the plate is wound in a state of being pressed against the plate cylinder side by a roller having the same shape as the plate presser roller 28 shown in FIG. In this embodiment, the portion of the plate presser roller (for holding the gripping end) 8 that contacts the notch groove 7 is formed to have a larger diameter by the width b, and the other portion has a smaller diameter than the large diameter portion 8a. It is comprised by the same diameter 8b. The cutout groove 7 is provided at the center of the holding butt 5 corresponding to the register pin 6.

Specifically, for example, the small diameter portion d1 is 26.0 mm, the large diameter portion d2 is 26.2 mm, the large diameter portion 8a has an axial length b of 30.0 mm. For example, if the opening width is 6 mm (tolerance 0 to +0.02 mm), the length of the register pin 6 fitted to the opening width is set to 6 mm (tolerance −0.01 to −0.025 mm). Thus, the dimension of the fitting part of the notch groove 7 and the register pin 6 is set with almost no play.
Further, at the four corners of the register pin 6 that contacts the side 7 a of the notch groove 7, chamfered portions 6 a are formed by cutting off the corners to form inclined surfaces.

  In the first embodiment having such a configuration, when the printing plate is mounted on the plate cylinder, the plate retainer shown in FIG. The plate is wound around the plate cylinder by rotating the plate cylinder once while being pressed by a roller having the same shape as the roller 28. When the holding edge 5 formed at the end of the printing plate is fitted to the register pin 6 provided in the vicinity of the locking opening of the plate cylinder by pressing with the plate pressing roller 8, the notch groove 7 and the register pin are fitted. 6, when the lateral shift a occurs, the opening end 7 b of the notch groove 7 hits the chamfered portion 6 a of the register pin 6, and the opening end 7 b is directed to the fitting position with the register pin 6. A force f is generated.

As a result, the open end 7b slides on the inclined surface of the chamfered portion 6a, and the notch groove 7 and the register pin 6 are smoothly fitted. Further, in this embodiment, only the large diameter portion 8a of the plate pressing roller 8 is in contact with the gripper butt 5 to apply a pressing force, so that the frictional force against the lateral movement of the gripper butt 5 is weak and the gripper is held. The bottom 5 is easy to move in the lateral direction.
By these actions, even if the opening end 7b of the notch groove 7 contacts the chamfered portion 6a of the register pin 6, it slides along the inclined surface and deformation of the side 7a can be avoided.

  2 and 3 are explanatory views showing the deformation state of the side of the notch groove in the case of two comparative examples. FIG. 2 is a first comparative example when the plate pressing roller 18 shown in FIG. 2A is used. The plate pressing roller 18 is composed of small-diameter large-diameter portions 19a to 19d that are arranged at four locations at equal intervals and have the same diameter, and small-diameter portions 18b that constitute other cylindrical portions. . When the gripper butt 15 is pushed by the plate presser roller 18 having such a configuration, the notch groove 17 of the gripper butt 15 is positioned at the center between the large diameter portions 19b and 19c, and therefore a force is applied to the notch groove 17. First, forces F1 and F2 are applied to the positions of the large diameter portions 19b and 19c with the notch groove 17 interposed therebetween.

  Accordingly, a force f1 that bends the gripping bottom 15 acts in the direction of reducing the opening of the notch groove 17 on the gripping bottom 15, and the force f1 acts in a direction perpendicular to the inclined surface of the chamfered portion 16a. The pin 16 cannot slide to the fitting position along the inclined surface of the chamfered portion 16a. Therefore, an excessive load is applied to the opening end 17b of the notch groove 17, and the side 17a is deformed. In the first comparative example of FIG. 2, as shown in FIG. 2C, the side 17a is deformed by 2.3 mm.

  FIG. 3 shows a second comparative example. The plate pressing roller 28 used in this comparative example is composed of a roller surface 28a having the same outer diameter over the entire length in the axial direction. When the gripper butt 25 is pushed by the plate presser roller 28 having this configuration, the same force F3 is applied to the gripper butt 25 over the entire length of the gripper butt 25 including the portion that hits the notch groove 27. Therefore, the opening end 27b of the notch groove 27 applies a force f2 in a direction perpendicular to the inclined surface of the chamfered portion 26a of the register pin 26.

Further, since the roller surface 28a of the plate presser roller 28 is in contact with the gripper butt 25 over the entire length, a large frictional force acts on the lateral movement of the gripper butt 25, and the gripper butt 25 is chamfered on the register pin 26. It is difficult to move laterally along the portion 26a. Due to these actions, the opening 27b of the notch groove 27 cannot move along the inclined surface of the chamfered portion 26a of the register pin 26, and therefore the side 27a of the notch groove 27 is likely to be deformed.
According to the verification by the inventors, in the second comparative example, as shown in FIG. 3C, the side 27a of the notch groove 27 was deformed by 1.2 mm.

  On the other hand, FIG. 4 shows the result of verification in the case of the first embodiment. In this case, it occurs with respect to the lateral movement of the holding edge 5 between the plate pressing roller 8 and the holding edge 5 as described above. The opening 7 b of the notch groove 7 is easy to move along the inclined surface of the chamfered portion 6 a of the register pin 6, and the opening end 7 b of the notch groove 7 is chamfered by the register pin 6 by the pressing force of the plate pressing roller 8. When hitting the portion 6a, a force f3 is applied to move the open end 7b in the fitting direction along the inclined surface of the chamfered portion 6a. Therefore, since the opening end 7b moves along the chamfered portion 6a, the opening end 7b can be smoothly moved to the fitting position while avoiding deformation of the side edge 7a. According to the verification by the present inventors, no deformation was found on the side 7a of the cutout groove 7 as shown in FIG.

  Next, a second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 5, the present embodiment is similar to the first embodiment shown in FIG. 1, and the inclined side 7 c that forms an opening that widens the immediate side 7 a of the notch groove 7 toward the outside, and the inclined side It is formed by a vertical side 7d connecting the bottom side 7e, and other configurations are the same as those in the first embodiment, and therefore, the same parts are denoted by the same reference numerals as in the first embodiment, Description of these parts is omitted.

  In this embodiment, even if the lateral displacement amount a between the notch groove 7 and the register pin 6 is further increased by providing the inclined side 7c at the opening end of the notch groove 7, the displacement amount a is not changed. If it is within the range 7c, the inclined side 7c contacts the chamfered portion 6a of the register pin 6 so that the inclined side 7c slides on the inclined surface of the chamfered portion 6a, and the plate pressing roller 8 has the large diameter portion 8a. Thus, there is an advantage that the notch groove 7 can be smoothly moved to the fitting position with the register pin 6 in combination with the action in the direction of expanding the notch groove 7.

  A vertical side 7d perpendicular to the bottom side 7e is formed at the back of the inclined side 7c, and the vertical side 7d forms a fit with no play with the register pin 6, so that an accurate fit to the plate cylinder of the holding butt 5 is achieved. Positioning can be performed. If the inclined scaffolding angles of the inclined side 7c and the inclined surface of the chamfered portion 6a of the register pin 6 are the same, the reaction force applied to the inclined side 7c from the chamfered portion 6a is evenly distributed over the entire inclined side 7c. Therefore, the inclined side 7c is not deformed, and the inclined side 7c and the chamfered portion 6a are in close contact with each other. The movement is performed more smoothly.

  As a modification of the present invention, in the plate pressing roller 18 of the first comparative example shown in FIG. 2 (a), the large size is provided at the center position between the large diameter portions 19b and 19c and the position where it contacts the notch groove 17. You may make it provide the large diameter part which has a larger diameter than the diameter parts 19b and 19c.

  According to the present invention, in an offset rotary printing press, particularly a newspaper offset rotary printing press, when positioning a printing plate using a pin register system on a plate cylinder, the gap between the notch groove of the gripper edge and the register pin can be easily configured. It will be possible to absorb and position the hips in the correct position.

It is a schematic diagram which shows the fitting part of the notch groove and register pin of 1st Example of this invention. It is explanatory drawing which shows the deformation | transformation state of the notch groove in a 1st comparative example. It is explanatory drawing which shows the deformation | transformation state of the notch groove in a 2nd comparative example. It is explanatory drawing which shows the presence or absence of a deformation | transformation of the notch groove in the said 1st Example of this invention. It is a schematic diagram of 2nd Example of this invention. It is a perspective view which shows the attachment condition to the plate cylinder of the printing plate which employ | adopted the conventional pin register system. It is explanatory drawing which shows the attachment condition to the plate cylinder of the printing plate which employ | adopted the conventional pin register system.

Explanation of symbols

01 plate cylinder 02 opening 03 printing plate 04 holding part 05 holding edge 06, 6, 16, 26 register pin 6a, 16a, 26a chamfered part 07, 7, 17, 27 cutout groove 7a, 17a, 27a side 7b, 17b, 27b Open end 7c Inclined side 7d Vertical side 7e Bottom side 08, 8, 18, 28 Plate pressing roller 8a Large diameter portion

Claims (9)

After the holding portion formed at one end of the printing plate is locked in a long hole formed in the axial direction of the plate cylinder and having an opening on the outer surface of the plate cylinder,
The plate is wound around the plate cylinder by rotating the plate cylinder once while pressing the plate with a plate pressing roller provided facing the surface of the plate cylinder,
A printing plate of an offset rotary printing press that positions the printing plate on the plate cylinder by fitting a notch groove formed on the other end of the printing plate to a register pin provided on the surface of the printing drum. In the positioning method,
The cylindrical portion of the portion that contacts the notch groove of the plate pressing roller is formed to have a larger diameter than other cylindrical portions,
By pressing the holding lip of the printing plate with the plate pressing roller, the cutting lip is bent in the direction of expanding the opening of the notch groove with the notch groove where the large-diameter portion hits as a base point. plate positioning method of an offset rotary printing press, characterized in that fitted to the register pin. Chamfering the end corner that contacts the open end of the notch groove of the register pin to form an inclined surface that descends outward;
The opening end of the notch groove is applied to the chamfered portion by pressing the gripping bottom portion of the printing plate with the plate pressing roller, and the opening end is slid along the inclined surface of the chamfered portion so that the notched groove is formed. 2. The printing plate positioning method according to claim 1, wherein the plate is fitted to the register pin. The side connecting the opening and the bottom of the notch groove is formed by an inclined side that forms an opening widened outward and a vertical side connecting the inclined side and the bottom, and the inclined side is formed by the register pin. 3. The printing plate positioning method according to claim 1, wherein the notch groove is guided to a fitting position with the register pin by sliding against the end of the plate. After the holding portion formed at one end of the printing plate is locked in a long hole formed in the axial direction of the plate cylinder and having an opening on the outer surface of the plate cylinder,
The plate is wound around the plate cylinder by rotating the plate cylinder once while pressing the plate with a plate pressing roller provided facing the surface of the plate cylinder,
A printing plate of an offset rotary printing press that positions the printing plate on the plate cylinder by fitting a notch groove formed on the other end of the printing plate to a register pin provided on the surface of the printing drum. In the positioning method,
The plate pressing roller has at least a cylindrical portion in contact with the printing plate having the same diameter, and when the printing plate is wound around the printing drum, the first pressing roller is configured to press the printing plate against the printing drum. The cylindrical portion of the portion that contacts the notch groove of the butt is formed to have a larger diameter than the other cylindrical portions, and the butt for attaching the holding butt of the printing plate is held when the notched groove is fitted to the register pin. A press plate positioning method for an offset rotary printing press, comprising: a press plate roller. A slot that extends in the axial direction and has an opening on the outer surface, and a position where a notch groove of a printing plate provided at the holding edge hits , with a holding part formed at one end and a holding edge formed at the other end A plate cylinder having a register pin protruding from the outer surface of the plate cylinder, and a plate pressing roller provided to face the surface of the plate cylinder,
In a printing plate positioning apparatus of an offset rotary printing press that positions the printing plate on the plate cylinder by fitting a notch groove on the gripping end with a register pin of the printing drum,
The cylindrical portion of the portion that contacts the notch groove of the plate pressing roller is formed to have a larger diameter than other cylindrical portions,
The holding edge of the printing plate is pressed by the plate pressing roller and the large diameter portion is applied to the notch groove of the holding edge so that the opening edge of the notch groove is expanded from the notch groove. A press plate positioning apparatus for an offset rotary printing press, wherein the notch groove is fitted to the register pin while being bent. Chamfering the end corner that contacts the open end of the notch groove of the register pin to form an inclined surface that descends outward;
The opening end of the notch groove is applied to the chamfered portion by pressing the gripping bottom portion of the printing plate with the plate pressing roller, and the opening end is slid along the inclined surface of the chamfered portion so that the notched groove is formed. 6. The printing plate positioning apparatus according to claim 5, wherein the printing plate positioning apparatus is configured to be fitted to the register pin.   The side connecting the opening and the bottom of the notch groove is formed by an inclined side that forms an opening widened outward and a vertical side connecting the inclined side and the bottom, and the inclined side is formed by the register pin. 6. The printing plate positioning apparatus according to claim 5, wherein the notch groove is guided to a fitting position with the register pin by sliding against the end of the plate. A slot that extends in the axial direction and has an opening on the outer surface, and a position where a notch groove of a printing plate provided at the holding edge hits, with a holding part formed at one end and a holding edge formed at the other end A plate cylinder having a register pin protruding from the outer surface of the plate cylinder, and a plate pressing roller provided to face the surface of the plate cylinder,
In a printing plate positioning apparatus of an offset rotary printing press that positions the printing plate on the plate cylinder by fitting a notch groove on the gripping end with a register pin of the printing drum,
The plate pressing roller has at least a cylindrical portion in contact with the printing plate having the same diameter, and when the printing plate is wound around the printing drum, the first pressing roller is configured to press the printing plate against the printing drum. The cylindrical portion of the portion that contacts the notch groove of the butt is formed to have a larger diameter than the other cylindrical portions, and the butt for attaching the holding butt of the printing plate is held when the notched groove is fitted to the register pin. A press plate positioning device for an offset rotary printing press, comprising: a press plate roller. An offset rotary printing press comprising the plate positioning device according to any one of claims 5 to 8.

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