Fly of a sheet-fed printing machine and method for adjusting the instants of opening and closing the gripper of such a fly

摘要

An intermediate rocking device called a "fly" is installed between a feed board in order to transfer sheets of paper one by one from the feed board to a cylinder equipped with grippers. The fly comprises means for cyclically rocking an arm (1) of the fly, means for cyclically opening and closing the gripper or grippers (4, 5) of the fly, means (21) for adjusting the instant of opening the gripper (4, 5) so as to release the sheet for the purpose of receiving it and transporting it via means provided thereafter (grippers on a cylinder, for example) and independent means for adjusting the instant of closing the gripper in order to seize the sheet on the feed board (3). Application especially to sheet-fed rotary offset presses. IMAGE