Abstract: Improvements relate to a photocopying machine with an auxiliary sheet feeder including a sheet-separation unit which withdraws sheets disposed on a tray. The improvements enable better separation of the sheets and easier removal of jammed sheets. (FIG. 1).

Abstract: A device for blocking or intercepting sheets for a sheet feeder may be applied to copiers, printers and similar office machines, and comprises a lever (32) capable of detecting the presence or absence of a sheet on the sheet entry hopper (16). The lever controls a stop member (42) to prevent the introduction of further sheets when at least one sheet is still present in a hopper.

Abstract: The device for the introduction of sheets makes it possible to introduce a stack of sheets through an auxiliary input or by-pass in addition to or as an alternative to the normal cassettes for sheets, with which the machine is fitted. A roll (57) rotating on a shaft (58) separates sheets from a stack inserted into a tray (54). A lever (68) is movable from a rest position to a function position. When the lever is moved to the functional position it causes a unidirectional clutch (86) mounted on the shaft to reverse the direction of rotation of the roll thereby moving sheets back to the tray. The lever also moves a cam (76) such that when the lever moved to the functional position, the tray is moved away from the roll such that additional sheets can be inserted.