Abstract: A sheet feeder device for a printing machine, having a pneumatic feeder head including a regulating screw mounted therein and provided with a pressure spring which is arranged between a shoulder of the regulating screw and a rest which is attached to a two-arm lever. To the frame of the printing machine is fixed a spacer on which are adjustably arranged straightening elements provided with rigidly attached eccentrics. The eccentric is turnably mounted in a body, in which is also turnably arranged, a connecting screw which is provided with a centering ring and a catch which seats on a bar fixed to the side wall of the printing machine. The straightening element is provided with a stop, on which bears a lever which is attached to the eccentric. A guide piece is also fixed to the straightening element. The device according to the invention enables the feeding of letter envelopes without the need of a special auxiliary device to be mounted to the printing machine.

Abstract: The drive of a rocking initial gripper of a sheet printing machine is derived from the shaft of the impression cylinder by a control cam by way of a control roller and a control lever fixed directly on the shaft of the rocking initial gripper without intermediate elements.