Abstract: A copying machine capable of copying either bulky originals or sheet originals. The machine includes a bulky original holder and sheet original feeder having a sheet original exposure section arranged at a position sufficiently spaced apart from the bulky original holder so that it does not interfere with the operation of the bulky original holder. A bulky original scanning device includes at least two movable mirrors, one of which is moved out of the optical path to form an optical path for scanning the sheet original.

Abstract: In a copying apparatus, an optical system for projecting an image of an original, carried on a carriage, on a photosensitive medium. The image is developed and then transferred to a transfer medium. A feed control system is provided for permitting, in accordance with a signal from a first signal source, a driving force to be transmitted through a first clutch for a predetermined time to feed the transfer medium. A register control system is provided for starting the feed of the transfer medium in synchronism with the image on the photosensitive medium, in accordance with a signal from a second signal source. The register control system is stopped after a subsequent first signal.

Abstract: This invention provides an electrophotographic device by which the surface potential of the photosensitive member is made substantially uniform at the time of termination of the photocopying process by rotating the photosensitive member through one revolution after the completion of the copying process while subjecting the photosensitive member to A.C. corona discharge or light exposure. Further, the reflecting mirror and the in-mirror lens are integrally rotated so as to adjust the light path length to obtain the most effective exposure. Moreover, the ratio of width of the central portion and both end portions of the slit for exposure can be varied to obtain the uniform and effective exposure.

Abstract: A copying apparatus having an original carriage capable of carrying thereon an original dimensionally corresponding to the combined area of two surfaces of a desired copy size is improved so that originals carried on the two surfaces at a time can be separately copied one by one.

Abstract: A transfer material separating device. An endless separation belt is interposed between a transfer material and a surface to which the transfer material is brought into contact. A rotatable member is provided for guiding the transfer material between the separator belt and the rotatable member to separate the transfer material. A deflecting member provides a separation path along which the transfer material is deflected by the rotatable member to separate the transfer material and, in addition, provides a return path which is out of contact with the surface to which the transfer material is brought into contact. The deflecting member serves to reduce the twist of the separation path as well as the return path.

Abstract: A copying apparatus for selectively copying sheet originals and thicker originals such as books and the like comprises various process means as used in an electrophotographic copying apparatus of the type which employs the liquid development and drum type image transfer system. The copying apparatus of the invention includes improvements in such means as original carriage, original transport means, guide for original carriage, original keep cover, means for controlling the operation of the copying apparatus, means for detecting the amount of toner in developing liquid, copy paper feed means, means for controlling the paper feed means, means for separating copy paper from a photosensitive drum, means for conveying copy paper from the feed means to a discharge port, means for repeating copying operation, means for drying and fixing the image on the copy paper, means for supporting the photosensitive medium, etc.

Abstract: In a copying apparatus of the type having a movable original carriage, there is provided drive velocity changing means for changing the drive velocity of the original carriage relative to an image forming member. Movable optical means is provided which has at least a mirror and a lens. One or both of the mirror and the lens may be moved or changed over in response to the drive velocity changing means, thereby changing the magnification at which an original is copied.

Abstract: An optical system for an electrophotographic machine utilizing a photosensitive member, wherein a reflecting mirror and an in-mirror lens are integrally pivotable for adjusting a light path between an original to be copied and the photosensitive member, for the purpose of establishing the most effective exposure of the photosensitive member with an image of the original.

Abstract: In an electrophotographic copying apparatus using developing liquid to develop an electrostatic latent image formed on the surface of an electrostatic image bearing member, a developing device comprises a developing liquid storage tank, a developing portion for contacting the electrostatic image bearing member with developing liquid, pumping means for supplying developing liquid from the storage tank to the developing portion, and means for controlling the density of the developing liquid.

Abstract: A copying machine includes a pair of copy material holders which are movable relative to a feed roller for selectively feeding copy material from either of the holders. In one embodiment, one of the holders is movable from a position adjacent the feed roller to a second position in which it receives already copied sheets. In a further embodiment, one of the holders is a pivoted cassette which is normally biased to a position adjacent the feed roller. This first cassette is movable away from the feed roller in response to the positioning of the second holder, also formed as a cassette, adjacent the feed roller. The second holder is slid into position on stationary rails.

Abstract: A copying apparatus capable of providing an image on both sides of a transfer material. The apparatus includes a pair of cassettes commonly usable as a feeding tray and a discharging tray, and a mechanism for detaching said cassettes. A transfer material fed from a cassette loaded in a feeding station has an image transferred thereto and fixed while passing through a required processing route, and said material is reversed onto an intermediary plate in a cassette loaded in the discharging tray station which is identical with the first mentioned cassette. The cassette which receives one side copied transfer materials when loaded in the discharging tray station is unloaded therefrom and loaded into the feeding station, and the reversed transfer material receives a second image in a manner similar to that described above.

Abstract: In a copying machine, a jam detecting device comprises jam detecting means operable in synchronism with movement of the photosensitive drum of the copying machine, and copy sheet discharge detecting means provided at an outlet for copy sheet. The two detecting means are positioned relative to each other so that T1 .ltoreq. T2, where T1 is the time interval required for a copy sheet fed from its supply station to reach an outlet and T2 is the time interval measured from the time the copy sheet leaves the supply station till the jam detecting means is operated for a second time. When T1 is greater than T2, jamming of the copy sheet is detected.

Abstract: An electrophotographic copying machine using a roll of sensitive paper in which the original holder for carrying the original reciprocates on the machine case of the electrophotographic copying device. While the original holder is in its backward motion, the original is illuminated so as to subject the electrophotographic-sensitive paper to a slit exposure, and the copy is obtained through subsequent steps of developing and fixing. The reciprocating motion of the original is related to the paper feed so that the paper is cut to the length of the original. An indicator is provided for indicating the size of the roll of sensitive paper in the paper-feeding unit and for indicating the maximum size original capable of being copied.

Abstract: An electrophotographic copying apparatus of slit exposure type comprises a sheet original conveyor mechanism provided on top of the machine housing, and an original carriage having a transparent sheet of glass or the like provided contiguously with the frame of the conveyor mechanism. When a sheet original is to be copied, such original is transported by the sheet original conveyor mechanism for a through-slit exposure. When a thick original such as book or the like is to be copied, the original carriage with the thick original thereon is forced to move with the conveyor mechanism to disconnect the mechanism from its drive system but connect the drive system to the original carriage, whereafter the carriage is moved for the thick original thereon to be subjected to a through-slit exposure.