Photocopying – Contact printing – Light boxes
Patent
1994-03-10
1995-05-30
Moses, R. L.
Photocopying
Contact printing
Light boxes
355271, G03G 1514
Patent
active
054206685
ABSTRACT:
An image forming apparatus including a rotatable photosensitive member, charging means for charging the photosensitive member at a predetermined potential, developing means for supplying toner to the photosensitive member to provide a developed image, transfer means including a transfer roller for transferring the developed image to a paper sheet, paper removal detecting means for detecting that a jammed paper is removed from the image forming apparatus, stopping means responsive to the jammed paper removal detecting means for stopping supply of the toner to the photosensitive member, rotating means responsive to the paper removal detecting means for rotating the photosensitive member and the transfer roller, and setting means responsive to the paper removal detecting means for setting the circumference of the transfer roller alternately in a first state, in which the circumference of the transfer roller is supplied with a first voltage more negative than the predetermined potential of the photosensitive member, and in a second state in which the circumference of the transfer roller is supplied with a second voltage more positive than the predetermined potential of the photosensitive member.
REFERENCES:
patent: 5150165 (1992-09-01), Asai
patent: 5253022 (1993-10-01), Takeuchi et al.
patent: 5287149 (1994-02-01), Hoshika
patent: 5337127 (1994-08-01), Imaue
Kabushiki Kaisha Toshiba
Moses R. L.
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