| 摘要 |
1,197,752. Printing presses; grippers. MILLER PRINTING MACHINERY CO. 19 July, 1967 [5 May, 1967], No. 33090/67. Heading B6C. [Also in Division F2] In a sheet-fed rotary offset printing press, Fig. 1, which may be used for perfecting or two-colour printing on the same surface of each copy sheet each gripper assembly is positively operated to closed and open positions by a cam-actuated mechanism in which the cam has a variable operating surface. Such variation is effected by the provision in the radially inner cam wall of a reversible insert 152, Fig. 7, the use of which enables the grippers to be opened for tension adjusting purposes in that part of the gripper path where, in normal printing operation of the press, the grippers are always closed. Each gripper, Fig. 4 comprises a part fixed on the gripper shaft 78 and a spring-loaded relatively movable part carrying a gripper finger 114. |
