Transfer device for offset printing

Abstract

A gate-shaped frame (21) is provided to cross over a guide rail (13) provided on a mount (12). Right and left bearing housings (28a, 28b) which rotatably hold a rotational shaft (30) of a blanket roll (19) at a roll support frame (27) are attached to columns (23a, 23b, 23c, 23d) of the frame (21) through linear motion guides moving in the vertical direction, and further, nuts (36) of ball screw mechanisms (33) are attached to respective bearing housings (28a, 28b), so as to form a transfer device (18) for offset printing. At the time of performing transferring or retransferring by pressing the blanket roll (19) from above a plate (14) on a plate table (15) or a print target (16) on a print target table (17) moving on the guide rail (13), with a predetermined contact pressure, deformation of mechanical structure portions other than the blanket roll (19) caused by the reaction force of the contact pressure can be prevented.

Description

technical field [0001] The present invention relates to a transfer device for offset printing provided with a rubber roller used for retransferring (printing) ink transferred (received) from a plate to a printing target during offset printing. [0002] This application claims priority based on Japanese Patent Application No. 2009-126035 for which it applied to Japan on May 26, 2009, and uses the content here. Background technique [0003] In recent years, as a method of forming electrode patterns (conductive patterns) of liquid crystal displays or the like on necessary substrates, printing techniques using conductive pastes as printing inks have been proposed instead of microfabrication by etching metal vapor-deposited films. For example, a method of printing and forming an electrode pattern on a substrate using a gravure offset printing technique has been proposed (for example, refer to Patent Document 1 and Patent Document 2). [0004] When offset printing a fine printing...

AI Technical Summary

Problems solved by technology

Due to the deformation of the mechanical structure of the transfer device 8, the geometric reproducibility of the shape, size, position, etc. of the printing pattern printed from the plate 5 to the printing object 6 via the rubber roller 9 decreases, and there is a problem that printing accuracy deteriorates.

[0013] In the offset printing devices disclosed in Patent Document 3 and Patent Document 4, there is no particular consideration regarding the deterioration of printing accuracy due to the deformation of the mechanical structure of the transfer device 8 when the roller is pressed as described above.

Therefore, the reproducibility of the printed pattern cannot be improved so much, and there is a problem that it is difficult to perform higher-precision printing.

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