| 摘要 |
An apparatus for positional adjustment of a plate cylinder in both lateral and circumferential directions thereof for image registration in a multicolor, offset rotary printing press. A lateral adjustment mechanism includes a spur gear which is motor driven bidirectionally, and which travels laterally back and forth, to cause lateral displacement of the plate cylinder. The gear has a pin erected eccentrically thereon for abutment against a fixed limit stop on the press frame in order to limit the bidirectional rotation of the gear and hence to prevent the plate cylinder from being driven laterally beyond limits. A circumferential adjustment mechanism includes another spur gear which is motor driven bidirectionally, and which also travels laterally back and forth, to cause circumferential displacement of the plate cylinder. This second gear has a double-ended pin extending eccentrically therethrough and having its ends projecting in opposite directions therefrom. The double-ended pin is to hit a pair of limit stops on the press frame, which are spaced from each other laterally of the gear, in the event of bidirectional circumferential displacement of the plate cylinder beyond limits.
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