Title: Magnetic brush developing apparatus

Abstract: A magnetic brush developing apparatus for use in a dry process electrophotographic copying apparatus which includes a developing roller rotatably provided adjacent to a movable photoreceptor surface and comprising a rotatable outer cylinder and a plurality of pairs of stationary magnets fixedly disposed around the outer cylinder at predetermined angles from one another with a first pair of the stationary magnets directed toward the photoreceptor and with a second pair directed toward a sump of developing material. In each pair of magnets, especially in the first pair for development, two magnets are spaced from each other at a predetermined distance to form soft magnetic brush bristles for uniform quality of copied images.

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Inventors: Tanaka, Susumu (Sakai, JA)
Enoguchi, Yuji (Osaka, JA)
Kawabata, Hidetoshi (Tondabayashi, JA)

Application Number: 500169
Filing Date: 1974-08-23
Publication_date: 1976-02-24
Assignee: Minolta Camera Kabushiki Kaisha (Osaka, JA)
Primary Class(es): 399/234 399/277
Other Classes:
US Patent Ref:

3145122	Aug, 1964	Streich	118/637.
3152924	Oct, 1964	Wanielista et al.	117/17.
3392432	Jul, 1968	Naumann	118/637.
3402698	Sep, 1968	Kojima et al.	118/637.
3457900	Jul, 1969	Drexler	118/637.
3626898	Dec, 1971	Gawron	118/637.
3783828	Jan, 1974	Forgo et al.	118/637.
3822139	Jul, 1974	Westdale	117/17.

Other Refs:
Primary Examiner: Feldbaum, Ronald
Assistant Examiner:
Attorney: Wenderoth, Lind & Ponack