| 摘要 |
A clamping and tensioning mechanism for mounting a thin flexible printing plate on the surface of a printing cylinder in which a mounting bar is provided having a longitudinal groove formed therein occupied by a clamping bar having upper and lower jaws which are shaped to deform and positively grip the end of the plate. The groove is of dovetail cross section so as to present opposed wedging surfaces having a shallow wedge angle, a spring being interposed in the root of the groove. As a result, when the end of the plate is inserted between the jaws and the mounting bar is subsequently moved in the plate tensioning direction, the jaws of the clamping bar are wedged together to deform the end of the plate and, upon continued movement of the mounting bar, the end of the plate is bodily drawn to tension the plate about the cylinder, thereby to provide positive lock-up. At the end of a printing run, when it is desired to remove the plate, a demounting tool applies inward retracting pressure to the upper jaw for disengagement of the clamping bar from the wedging surfaces to permit spreading of the jaws for release of the end of the plate. In one embodiment of the invention the mounting bar is in two sections spaced end to end and separately adjustable in the peripheral direction with expansible means for bridging the gap between them. |
