Image forming apparatus having image transfer electrode contacta

Details Image forming apparatus having image transfer electrode contacta Image forming apparatus having image transfer electrode contacta

1992-09-23

1994-02-15

Smith, Matthew S.

Photocopying

Contact printing

Light boxes

355208, 355214, 355219, 355271, 355273, 355274, G03G 2100

Patent

active

052871495

ABSTRACT:
An image forming apparatus includes an image bearing member for bearing a toner image, movable along an endless path; an original supporting platen for supporting an original: an illumination source for illuminating an original on the supporting platen; an image forming device including a charger, an exposure optical system, including a reciprocable part, for directing a light image of the original on the supporting platen, a developing device and an image transfer device, wherein the reciprocable part moves in a first direction, during an image formation, in which the light image is directed to the image bearing member for image formation thereon and in a second direction, during non-image-formation, for returning the part; wherein the illumination source emits light both during the image formation and during the non-image-formation to direct the light image to the image bearing member, and wherein a developing bias voltage in the developing device is switched depending on whether the apparatus is in the image formation or in the non-image-formation so that an image formed on the image bearing member is not developed by the developing device during the non-image-formation.

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patent: 5099286 (1992-03-01), Nishise et al.
patent: 5132738 (1992-07-01), Nakamura et al.
patent: 5150165 (1992-09-01), Asai
patent: 5151736 (1992-09-01), Ohzeki et al.
patent: 5182604 (1993-01-01), Asai

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