| 摘要 |
<p>An apparatus for fine positional adjustment of a plate cylinder in both lateral and circumferential directions thereof for multicolor image registration in a rotary offset printing press or the like. Included are frame means (22, 22', 26, 26') for supporting a plate cylinder (1) for both lateral and circumferential displacement, lateral adjustment means (14 or 14') for positional adjustment of the plate cylinder in a lateral direction thereof relative to the frame means, and circumferential adjustment means (15 or 15') for positional adjustment of the plate cylinder in a circumferential direction thereof relative to the frame means. In order to prevent the plate cylinder from being driven laterally beyond limits, with the consequent jamming of the apparatus, a gear (28) included in the lateral adjustment means (14 or 14') has a pin (32) mounted eccentrically thereto for movement, with the bidirectional rotation of the gear, into abutment against the opposite sides of a fixed limit stop (33). Another gear (40 or 40'), included in the circumferential adjustment means (15 or 15'), also eccentrically carries a double-ended pin (44 or 44') which, upon combined bidirectional rotation and lateral travel of the gear, is movable into abutment against a pair of fixed limit stops (45a and 45b) which are spaced laterally of the gear, for preventing the plate cylinder from being driven circumferentially beyond limits. <IMAGE></p> |
