Abstract: For use in an electrographic development apparatus having a development station and a sump wherein at least one auger moves developer between the sump and the development station, a magnetic curtain seal is disposed adjacent the auger proximate to the auger passageway (between sump and development station) and attracts sufficient developer to block the auger passageway and thereby prevent toner dust from escaping from the sump into the development station.

Abstract: Recirculating feeders, operatively connected to a copier, can operate in collate or noncollate modes, i.e. produce collated or noncollated output copies. In the noncollate mode of operation, the recirculating feeder acts in a similar manner as a conventional document feeder. When an operator places only a single original document in the recirculating feeder and, mistakenly, the feeder and copier are in the collate mode of operation, the apparatus will automatically determine that there is only a single original document in the recirculating feeder and transfer the mode of operation from collate to noncollate.

Abstract: Electrophotographic copying apparatus is disclosed having an elongated electrosensitive web defining a plurality of selectable image areas and having a plurality of perforations formed along an edge therein and movable along an endless path relative to a plurality of actuable work stations disposed along the path. The work stations are operative when actuated to perform a work operation on a selected image area of the web, respectively. The apparatus includes means disposed at a fixed location along the path for sensing the perforations to produce signals, a logic and control unit having a programmable computer with a stored program and responsive to such perforation signals for actuating the work stations in accordance with the program to cause the work stations to perform work operations on the web in timed relation to movement of selected image areas along the path respectively.

Abstract: Apparatus is disclosed for transporting and cutting film in a computer output microfilmer which includes mechanisms for transporting and cutting the film respectively, and circuitry responsive to successive sequences of pulses for controlling such mechanisms. The transport mechanism includes a pair of stepping motors having phase windings responsive to current pulses which drive the film in mutually perpendicular directions respectively. Motor control circuits responsive to the pulses are operative to switch current through these phase windings so that successive columns, each containing a plurality of frames in which images may be recorded, are disposed successively at a film gate. The shaft of the motor which transports the film in the columnar direction has an optical sensor which produces output signals corresponding to the location of the film at a reference position.

Abstract: Apparatus is disclosed for use with image forming apparatus having a pair of galvanometers one of which, in response to a ramp signal rotates a mirror which scans lines in one direction across the image and the other of which in response to a staircase signal rotates another mirror in a direction perpendicular to the direction of the lines to scan successive ones of the lines. The apparatus includes circuits responsive to the galvanometer drive signal amplitudes for producing a compensating signal which is representative of the angular displacement of the mirrors and thus of the position to which the beam is scanned at any instant. This compensating signal and the signal which drives the galvanometer which scans the beam between successive lines are combined to adjust the angular displacement of the mirror which scans the beam in the direction between the successive lines, thus correcting the geometric distortion of the pin cushion type of the image.