Electrostatic copying apparatus

Details Electrostatic copying apparatus Electrostatic copying apparatus

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G03G 15/02 (2006.01) G03G 15/00 (2006.01) G03G 15/04 (2006.01) G03G 15/08 (2006.01) G03G 21/16 (2006.01) G03G 21/20 (2006.01)

Patent

CA 1174724

TITLE OF THE INVENTION ELECTROSTATIC COPYING APPARATUS ABSTRACT OF THE DISCLOSURE An electrostatic copying apparatus comprising a housing, a photo- sensitive member disposed within the housing for free movement through the end- less moving path defined within the housing, an original-support mechanism dis- posed on the top surface of the housing and including a transparent plate on which to place an original document to be copied, a charging corona-discharge de- vice for applying corona discharge to the photosensitive member in a latent electrostatic image-forming zone located along the moving path of the photo- sensitive member, an optical unit for projecting the image of the original docu- ment placed on the transparent plate onto the photosensitive member in the latent electrostatic image-forming zone, and a paper transfer unit for transferr- ing a copying paper through a predetermined transfer passage extending through a transfer zone located along the moving path of the photosensitive member and downstream of the latent electrostatic image-forming zone in the moving direc- tion of the photosensitive member. The apparatus further includes a detecting means for detecting the longitudinal size of the copying paper being transferred by the transfer unit and a control means for operating the charging corona-dis- charge device only for a time period corresponding to the detected longitudinal size of the copying paper.

374708

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