Abstract: A sheet folding machine having a pair of sheet folding rollers and a widthwise displacing direction sheet stopper provided in a sheet conveying path. The pair of sheet folding rollers are rotatable perpendicular to the sheet conveying direction of the sheet conveying path and abut against each other with the sheet stopper disposed along the sheet conveying direction. An idle roller adapted to depress a sheet against one of said sheet folding rollers. A curving member bends the sheet towards the nipping region of the pair of sheet folding rollers. A control mechanism detects the delivery of the sheet to the pair of sheet folding rollers and operates the operating mechanism for a predetermined period of time.

Abstract: A plurality of discrete length paper recirculation paths are connectable in series in accordance with the detected length of an original document, so that the shortest possible recirculation path length is selected to maximize copying speed.

Abstract: A copying machine includes a system for projecting an image of an original onto a photosensitive member selectively at one of a plurality of magnifications. The projection system includes two lenses. A movable carriage supports the lenses. The carriage is arranged for movement between a first position wherein one of the lenses is operative and a second position wherein the other of the lenses is operative. Adjustable stops are provided for stopping the carriage at the first or second positions. An overcenter device responsive to the movement of the carriage more than half its distance of travel between the first and second positions operates to move and bias the carriage against the stops.

Abstract: A sensitive drum of an electrophotographic reproducing machine, when disengaged from its driving mechanism, is received by rails provided at the opposited ends thereof and, after pulled along the rails, received and supported rotatably by rotary supporting members provided on extensions of the rails, respectively, for the purpose of cleaning of the drum.