Charge removing device for an electrophotographic copying machine
AssigneeSharp Kabushiki Kaisha
InventorsKatsuyoshi Fujiwara, Hiroshi Uchiyama
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Abstract
An electrophotographic copying machine comprises a light beam reflection device, a charge removing device, a developing device, and a control device. The light beam reflection device is operated to reflect light beams from a document image portion and a margin portion to a photoreceptor. The control device causes the charge removing device to remove unnecessary charges in order to erase a latent image corresponding to the margin portion. The developing device is operated to develop the latent image exactly corresponding to the document portion. The control device may comprise a timer or lead switches.
Claims4
A charge removing system for removing charges from a surface of a photoreceptor means to develop a latent image on said photoreceptor means in an electrophotographic copying machine comprising:
- a light incident means for directing light beams toward said photoreceptor means, said light beams being reflected from a document to be copied including areas producing false images, such as document edges and a document gutter margin;
- a charge removing means for removing unnecessary charges from said surface of said photoreceptor means, said unnecessary charges corresponding to said area of said document producing said false images;
- and
- a control means for controlling the activation of said charge removing means said control means comprising a timer means for counting a time of moving said light incident means between a position of scanning the document and a position of scanning the false image producing areas, such as said document edges and document margin, and a lead switch means for sensing whether said document is being scanned or said false image producing areas including said margin is being scanned.
Dependencies are inferred from the claim text.