Image forming apparatus selectively charging toner using doctor

Details Image forming apparatus selectively charging toner using doctor Image forming apparatus selectively charging toner using doctor

1995-12-14

2000-04-11

Grimley, Arthur T.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

399284, B41J 239, B41J 2395, B41J 240, G03G 1500

Patent

active

060493453

ABSTRACT:
A doctor blade is provided in contact with frictionally charged toner in a toner tank, which regulates the amount of toner held on a toner holder. A charge control unit supplies to the doctor blade a voltage for selectively charging the toner. As a result, the amount of toner held on the toner holder is regulated, and simultaneously, the toner is charged to a specific polarity with a potential of the frictional charge or more. An electrostatic latent image is formed by the selectively charged toner. The toner is moved and transferred onto a papersheet which is sequentially transported, under the influence of an electric field generated by application of a voltage to an opposite electrode disposed opposing the toner holder. An image by the toner is thus formed on the papersheet.

REFERENCES:
patent: 4502061 (1985-02-01), Ando et al.
patent: 4521502 (1985-06-01), Sakai et al.
patent: 4544935 (1985-10-01), Sakai
patent: 4797695 (1989-01-01), Konno et al.
patent: 4921768 (1990-05-01), Kunugi et al.
patent: 5153616 (1992-10-01), Asanae et al.
patent: 5416569 (1995-05-01), Goldberg

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