JP2012166569A - Fixing device for blanket or printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device capable of more surely fixing a blanket or a printing plate without lowering rigidity of a drum while a mechanism is simplified.SOLUTION: The fixing device for the blanket or the printing plate that fixes the blanket 10 or the printing plate wound around the drum 20 in a rotary press includes: a constrained groove 21 which is formed on the drum 20, and on which a gripper side 11a of the blanket or the printing plate is suspended, and in which a gripper end side 11b is inserted; a leaf spring 30 which extends over the whole length in a drum shaft direction of the constraining groove 21, and at least one end in a longitudinal direction of which is inserted to project from the end in the longitudinal direction of the constraining groove 21; and a pressing member 40 which presses at least one end of the leaf spring 30, projecting from the end in the longitudinal direction of the constraining groove 21, in the longitudinal direction and bends the leaf spring 30 in a direction orthogonal to the longitudinal direction.

Description

  The present invention relates to a blanket or printing plate fixing device for fixing a blanket or printing plate wound around a cylinder in a rotary press.

  In a rotary press for printing newspapers and the like, printing is performed by a blanket wound around a blanket cylinder transferring ink transferred from a printing plate wound around a plate cylinder while rotating to a running paper.

  Conventionally, as a method of winding and fixing a blanket or printing plate around a blanket cylinder or plate cylinder, a restraining groove is formed in the blanket cylinder or plate cylinder, and the holding side of the blanket or printing plate is hooked into the restraining groove, and the gripper side There is a known method for fixing. And the fixing device for ensuring the fixation is disclosed by patent document 1. FIG. The fixing device of this patent document 1 presses a press-fitting body into a restraining groove (insertion groove) into which a holding side (leading end) and a holding bottom side (rear-end end) of the blanket are inserted, whereby the holding side and the holding side of the blanket. The bottom side is pressed against the wall surface of the restraint groove and fixed.

  However, it is not enough to fix the blanket or printing plate by simply press-fitting the press-fitting body. In particular, under the printing conditions in which the blanket cylinder or plate cylinder is rotated at a higher speed, the blanket or printing plate loosens and printing defects occur. There was a thing.

JP 2002-326341 A

  An object of the present invention is to provide a fixing device that can fix a blanket or a printing plate more reliably without simplifying the mechanism and lowering the rigidity of the cylinder.

  The fixing device of the present invention is a blanket or printing plate fixing device for fixing a blanket or printing plate wound around a cylinder in a rotary press, and is formed on the cylinder, and the holding side of the blanket or printing plate is hooked and held. A restraint groove into which the bottom side is inserted, a leaf spring that is inserted so that at least one end in the longitudinal direction of the restraint groove extends in the longitudinal direction of the trunk axis, and protrudes from an end in the longitudinal direction of the restraint groove, and the restraint groove And a pressing member that presses at least one end of the leaf spring projecting from the end in the longitudinal direction toward the central portion in the longitudinal direction and bends the leaf spring in a direction perpendicular to the longitudinal direction.

  In the present invention, the “cylinder” is a general term for a blanket cylinder and a plate cylinder.

  According to the present invention, since the leaf spring is bent in the direction perpendicular to the longitudinal direction by the pressing member, the holding side and the holding bottom side of the blanket or the printing plate are firmly restrained by the leaf spring, so that the mechanism is simplified. The blanket or the printing plate can be more securely fixed without reducing the rigidity of the cylinder.

It is a side view which shows the Example of this invention. It is a perspective view which shows the state which removed the press member in the Example of FIG. It is explanatory drawing which shows the relationship between the restraint groove | channel and the length of a leaf | plate spring in the Example of FIG. It is a perspective view which shows the press member used in the Example of FIG. It is a perspective view which shows the example of a shape of the leaf | plate spring used in this invention.

  Embodiments of the present invention will be described below based on examples shown in the drawings.

  FIG. 1 is a side view showing an embodiment of the present invention. The fixing device of this embodiment fixes the blanket 10 to the blanket cylinder 20. A single blanket 10 having a width of two pages is wound around the blanket cylinder 20.

  The blanket 10 is a so-called metal blanket in which one surface of a metal plate 11 is covered with a rubber-like blanket sheet 12 except for both end portions (the holding side 11a and the holding bottom side 11b), and the holding side 11a is covered with a blanket cylinder. The blanket body 20 is wound around the wall surface of the restraint groove 21 formed on the wall 20 and inserted into the restraint groove 21 by the gripper butt side 11b.

  A leaf spring 30 is inserted into the restraining groove 21 over the entire length in the trunk axis direction between the holding side 11a and the holding bottom side 11b. As shown in FIGS. 2 and 3, the leaf spring 30 is inserted into the restraining groove 21 such that both ends in the longitudinal direction protrude from the end of the restraining groove 21 by the length a.

  Returning to FIG. 1, a pressing member 40 that presses the end of the protruding leaf spring 30 toward the longitudinal center is attached to the portion where the end of the leaf spring 30 protrudes from the end of the restraining groove 21. ing. As shown in FIG. 4, the pressing member 40 is formed with a fitting groove 41 into which the end of the leaf spring 30 is fitted. The fitting groove 41 is formed such that its length b is shorter than the protruding length a of the leaf spring 30 described above, but the width and height are increased with a margin. As shown in FIG. 1, the pressing member 40 is fixed to both end portions of the blanket cylinder 20 by fixing members (bolts) 42 with the end portions of the leaf springs 30 fitted in the fitting grooves 41. Then, as described above, since length a> length b, the leaf spring 30 is pressed in the longitudinal direction by the pressing members 40 at both ends.

  The upper part of the fitting groove 41 (the radially outer side of the blanket cylinder 20) is preferably closed as in this embodiment. Thereby, the leaf spring 30 can be prevented from coming off. The lower portion of the fitting groove 41 (inward in the radial direction of the blanket cylinder 20) may be closed as in this embodiment, but there is no problem even if it is opened.

  The leaf spring 30 can be simply formed in a flat plate shape as shown in FIG. When both end portions of such a flat plate spring 30 are pressed in the longitudinal direction by the pressing member 40 described above, the plate spring 30 is orthogonal to the longitudinal direction as shown exaggerated by broken lines in FIG. Bend. As a result, the longitudinal center portion of the leaf spring 30 protrudes, and the longitudinal center portion and both end portions of the leaf spring 30 abut against the holding side 11a or the holding bottom side 11b of the blanket 11, and the blanket. 10 is securely fixed.

  The leaf spring 30 may have a wave shape that undulates in the longitudinal direction as shown in FIG. If this corrugated plate spring 30 is used and both end portions thereof are pressed in the longitudinal direction by the pressing member 40, the leaf spring 30 bends in a direction perpendicular to the longitudinal direction, whereby each apex 31 and both ends of the corrugated shape are bent. Since the portion abuts against the holding side 11a or the holding buttocks side 11b of the blanket 10 and the number of points hitting the holding side 11a or the holding buttocks side 11b is increased as compared with the case where the flat plate spring 30 is used, the blanket 10 is more reliable. Fixed to.

  In the above embodiment, both end portions of the leaf spring 30 are protruded from the end portions of the restraining groove 21 and the pressing member 40 is attached to both end portions. However, one end portion of the leaf spring 30 is the end of the restraining groove 21. Alternatively, only one end of the leaf spring 30 may protrude from the end of the restraining groove 21, and the pressing member 40 may be attached only to the protruding end.

  Further, in the above embodiment, only one blanket having a width of two pages is wound around the blanket cylinder. However, the present invention is applied when two blankets having a width of two pages are wound along the axial direction of the blanket cylinder. Is also applicable. In this case, since each of the restraining grooves is formed by shifting the phase by 180 °, the end portions of the two blankets located on the end side of the blanket cylinder are protruded, and the pressing member is attached to the blanket cylinder. The end located on the center side of the is fixed to the center side.

  Further, in the above embodiment, the case where the blanket is fixed has been described. However, it is obvious that the printing plate can be fixed in the same manner.

DESCRIPTION OF SYMBOLS 10 Blanket 11 Metal plate 11a Holding side 11b Holding bottom side 12 Blanket sheet 20 Blanket cylinder 21 Restraining groove 30 Leaf spring 31 Vertex 40 Pressing member 41 Fitting groove 42 Fixing member (bolt)

Claims (3)

A blanket or printing plate fixing device for fixing a blanket or printing plate wound around a cylinder in a rotary press,
A constraining groove formed on the cylinder, to which the holding side of the blanket or printing plate is hooked, and into which the holding bottom side is inserted;
A leaf spring that is inserted so that at least one end in the longitudinal direction of the restraint groove extends in the longitudinal direction of the restraint groove and protrudes from the longitudinal end of the restraint groove;
Blanket or printing comprising a pressing member that presses at least one end of the leaf spring protruding from the longitudinal end of the restraining groove toward the longitudinal center and deflects the leaf spring in a direction perpendicular to the longitudinal direction. Plate fixing device.   The blanket or printing plate fixing device according to claim 1, wherein the leaf spring has a corrugated shape undulating along the longitudinal direction.   The blanket or printing plate fixing device according to claim 1 or 2, wherein the pressing member has a fitting groove into which a leaf spring is fitted.

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