1
Junichi Takamatsu, Kazunori Akiyama: Removable developing units for a copying machine and display for indicating the useful life of the machine. Mita Industrial Co, November 27, 1990: US04974020 (59 worldwide citation)

An image-forming machine, such as an electrostatic copying machine, having a number of optional features. A display device is provided for displaying the number or type of toner cartridge loaded in the main body of a developing device. An image-forming condition adjusting device is provided for adju ...


2
Satoru Inoue, Masaakira Umehara, Kazuo Aramaki, Hideo Inuzuka, Kouji Yamanobe: Color electrostatic copying machine. Ricoh Company, David G Alexander, July 31, 1979: US04162843 (56 worldwide citation)

Three primary color toner images are transferred successively onto a copy sheet from three photoconductive drums. The copy sheet is successively moved into engagement with the drums in register with the toner images by an endless belt. Various transfer charging means are provided to electrostaticall ...


3
Koichi Suzuki, Shigeru Suzuki: Exposure and development control apparatus for electrostatic copying machine. Ricoh Company, David G Alexander, May 8, 1979: US04153364 (51 worldwide citation)

An optical system focusses a light image of a linear portion of an original document onto a rotating photoconductive drum. The optical system scans the document so as to progressively form an electrostatic image on the drum. A scanning linear photosensor array is disposed such that the light image i ...


4
Josef Pfeifer, Gunther Schnall: Electrostatic copying machine with removable copying drum. Agfa Gevaert, Michael J Striker, June 29, 1976: US03966316 (49 worldwide citation)

An electrostatic copying machine wherein the copying drum and the cleaning unit for the photosensitive layer of the drum are mounted in the plastic casing of a module which can be inserted into the stationary main portion of the housing upon pivoting of a cover to open position. The main housing por ...


5
Toyokazu Satomi, Yutaka Koizumi, Isao Nakamura, Yasuhiro Tabata, Tamaki Kaneko: Electrostatic copying machine. Ricon, David G Alexander, June 9, 1981: US04272180 (48 worldwide citation)

First and second original documents are copied on the opposite sides of a copy sheet in superposition in such a manner that the centers of the two copied images on the opposite sides of the copy sheet are coincident with each other. The two copied images are offset from the center of the copy sheet, ...


6
Koji Sakamoto, Seiichi Miyakawa, Susumu Tatsumi: Electrostatic copying machine. Ricoh Company, Jordan and Hamburg, October 7, 1980: US04226525 (46 worldwide citation)

An exposure unit radiates a light image of an original document onto a charged photoconductive member to form an electrostatic image through localized photoconduction. A developing unit applies a powdered developing substance comprising carrier particles and toner particles to the photoconductive me ...


7
Masumi Ikesue, Takashi Yano, Susumu Tatsumi, Hiroyuki Idenawa, Isao Nakamura, Tatsuo Tani: Variable magnification electrostatic copying machine. Ricoh Company, David G Alexander, July 7, 1981: US04277163 (44 worldwide citation)

The vertical and horizontal lengths of an original document (28) are automatically sensed and compared with the vertical and horizontal lengths of a copy sheet (38) and the reduction ratio of a variable magnification optical system (33) is automatically adjusted in accordance therewith so that the m ...


8
Yutaka Deguchi, Rikuzou Kouzuki, Daiwa Iinuma, Kenhachi Shiraki, Kiyoshi Sakamoto, Kunio Tsuboi, Yoshitaka Shibata: Electrostatic copying machine having removable paper path. Sanyo Electric, Darby & Darby, July 30, 1985: US04531823 (36 worldwide citation)

An electrophotographic copying machine includes a photosensitive drum on which an electrostatic latent image is formed, a developing apparatus for developing the electrostatic latent image into a toner image, a transferring apparatus for transferring the toner image to a copy paper supplied from a p ...


9
Katsuo Sakai: Two color electrostatic copying machine. Ricoh Company, David G Alexander, February 19, 1980: US04189224 (33 worldwide citation)

A photoconductive drum (22) is formed with first and second photoconductive layers of different spectral sensitivities. First and second chargers (12), (14) apply electrostatic charges of opposite polarities to the drum (22) to form a stratified charge pattern. Radiation of a light image onto the dr ...


10
Nobuyuki Yanagawa: Electrostatic copying machine comprising improved arrangement of operating units. Ricoh Company, David G Alexander, September 13, 1983: US04403851 (32 worldwide citation)

A cover (24) is hinged to the top of a housing (22) in such a manner as to be rockable from a closed position and an open position. A platen (23) is provided on top of the cover (24) for supporting an original document (26). A movable charging and scanning unit (32), endless photoconductive belt (27 ...



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