Abstract: An automatic document feeder 1 automatically operates a tray depending on the operating conditions of the automatic document feeder. The automatic document feeder 1 has a set surface 7 on which originals to be conveyed are to be set. An original receiving tray 11 for receiving discharged originals is provided in the vicinity of an original discharge port 10. A lower end of the original receiving tray 11 is rotatable, and a tray driving device is connected to the back of the original receiving tray 11. The tray driving device rotates and displaces the original receiving tray 11 around the lower end depending on the operating conditions of the automatic document feeder 1. The original receiving tray 11 is raised almost perpendicularly until the originals are set on the set surface 7 (see FIGS. 4A and 4D). When the originals are conveyed, the original receiving tray 11 is rotated to an obliquely laid state (see FIGS. 4B and 4C) in order to receive the paper sheets discharged from the discharge port 10.

Abstract: A shell-type electrostatic copying apparatus comprising a lower supporting frame, an upper supporting frame mounted on the lower supporting frame for free pivotal movement between an open position and a closed position, and a unit which includes a unit frame and a rotating drum mounted rotatably on the unit frame and adapted to be detachably mounted on the upper supporting frame. A provisional unit placing means is provided in the lower supporting frame for supporting the unit frame movably. The unit is mounted detachably on the upper supporting frame by placing the unit on the provisional unit placing means, pivoting the upper supporting frame from the open position to the closed position and then moving the unit in a specified direction.

Abstract: A method for transferring a toner image on the surface of an image-bearing member obtained as a result of development with a conductive or semi-conductive toner material to the surface of a receptor member, which comprises bringing the surface of the receptor member into contact with the toner image on the surface of the image-bearing member and simultaneously applying a corona discharge to the back surface of the receptor member. The angle formed between the lines of electric force of the corona discharge and a line perpendicular to the receptor member does not exceed about 30 degrees.

Abstract: An electrostatic copying apparatus having a document holding device and a semi-automatic document feeding and discharging device provided on the top of a housing. The semi-automatic document feeding and discharging device includes a main frame structure mounted for free turning between an operating position and a non-operating position. When the main frame structure is held at the operating position, a document conveying passage having an introducing section, a main section and a curved discharging section is defined.

Abstract: A cleaning device for use in an electrostatic copying machine removes with a blade any residual toner from a photosensitive body after a toner image has been transferred therefrom to a sheet of copying paper. A support shaft supports the blade for slidable contact with the photosensitive body and has a horizontal axis extending perpendicularly to a direction of travel of the photosensitive body. The support shaft is angularly movable about the axis and is axially movable. A rotational shaft is rotatable about an axis parallel to the support shaft. A first device converts rotational movement of the rotational shaft into reciprocal movement along the axis of the support shaft. A second device converts rotational movement of the rotational shaft into reciprocal angular movement of the support shaft. A third device releases interconnection between the rotational shaft and the first and second devices.

Abstract: A mass of residual charged toner is blocked by a blade member held in slidable engagement with a photosensitive member against movement therewith toward a development roller when an image is being formed on the photosensitive member. When no image is being formed thereon, the blade member is lifted off the photosensitive member to allow the mass of residual toner to move therewith toward the development roller. During this time, a bias potential having a polarity the same as that of the toner is applied to members of an electrostatic or electrographic copying machine located between the blade member and the development roller for repelling the mass of toner toward the photosensitive member against being scattered off the latter and hence smearing surrounding parts.

Abstract: An electrostatic copying apparatus having a document holding device and a semi-automatic document feeding and discharging device provided on the top of a housing. The semi-automatic document feeding and discharging device includes a main frame structure mounted for free turning between an operating position and a non-operating position. When the main frame structure is held at the operating position, a document conveying passage having an introducing section, a main section and a curved discharging section is defined.

Abstract: An electrostatic copying apparatus comprising a rotating endless photosensitive material, an image-forming means for forming an image on the photosensitive material, a conveying means for conveying through a predetermined passage a copying sheet to which the image formed on the photosensitive material is to be transferred, and a cleaning means for cleaning the photosensitive material after image transfer. In the performance of one copying cycle, the image formation is completed before the photosensitive material has rotated through one turn from the starting of image formation, but the photosensitive material is further kept in rotation for cleaning. When a plurality of copying cycles are performed successively, the starting point of image formation in the next copying cycle is selectively set on the basis of the length in the conveying direction of the copying sheet conveyed through the passage during the previous copying cycle.

Abstract: A roller supporting arrangement for an electrostatic copying apparatus having a plurality of pairs of copy paper transport rollers spaced along a copy paper transport passage includes a support frame for supporting the lower rollers of the respective pairs of transport rollers. A support shaft is mounted horizontally to a copying apparatus housing, by which the support frame is rotatably supported. A device is provided for pushing up the support frame and for releasing the support frame from the push-up force to be turned downward about the support shaft. Since the lower rollers of the pairs of the rollers mounted at the copy paper sheet transport passage are connected pivotally to the support frame which is rotatable about the horizontal support shaft, it is easy to open the copy paper sheet transport passage when a copy paper is jammed in the copy paper sheet transport passage.

Abstract: A paper feed device for a copying machine, in which paper jamming at the copying paper cutting mechanism is effectively prevented is provided. This paper feed device for a copying machine comprises a feed reel for supporting a copying paper wound thereon in a roll-like form, a paper feed roller intermittently driven and rotated to take out the copying paper from the feed reel, an introduction roller disposed on the introduction side of a transfer passage for delivering the copying paper to copying treatment zones in the copying machine, and a copying paper-cutting mechanism disposed between the paper feed roller and the introduction roller to cut the copying paper taken out of the feed reel into a prescribed length.

Abstract: A copying machine of the diazo type comprises a light exposure zone for exposing to light a diazo type photosensitive sheet superposed with an original, a development zone for developing the light exposed photosensitive sheet and a delivery mechanism for feeding the original and diazo type photosensitive sheet to the light exposure zone and forwarding the light exposed photosensitive sheet to the development zone. The light exposure zone includes a transparent cylinder capable of rotating while having a superposed assembly of the original and photosensitive sheet closely contacting the outer surface thereof and a heat-generating light source mounted in the interior of the transparent cylinder.