Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1982-09-01
1984-03-13
Prescott, A. C.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 3DD, 355 14D, 430122, 430125, 118652, 118657, 118658, G03G 1508
Patent
active
044364130
ABSTRACT:
A magnetic brush developing apparatus has a developing sleeve made of a nonmagnetic material, a magnetic roller rotatably mounted within the developing sleeve, a magnetic developer supply device to supply developer to the peripheral surface of the developing sleeve, a drive connected to the magnetic roller for rotating the magnetic roller to transport the supplied developer along the peripheral surface of the developing sleeve, and a developer scraping member made of a nonmagnetic material and having a free end engaged with the developing sleeve for scraping developer off the peripheral surface of the developing sleeve and guiding the developer along a guide surface on the scraping member in a direction away from the surface of the developing sleeve. A foreign material separating member made of a magnetic material is disposed within a region which is subject to the magnetic action of the magnetic roller and having an edge spaced from and opposed to the guide surface around which an alternating magnetic field is set up when the magnetic roller is rotated, whereby the alternating magnetic field agitates the developer being guided along the guide surface for separating foreign material from the developer scraped off the peripheral surface of the developing sleeve.
REFERENCES:
patent: 3816157 (1974-11-01), Donohue et al.
patent: 3917397 (1975-11-01), Tanaka et al.
patent: 4190351 (1980-02-01), Macaluso et al.
patent: 4205911 (1980-06-01), Dole
patent: 4319832 (1982-03-01), Sakamoto et al.
patent: 4361397 (1982-11-01), Katakura et al.
patent: 4385829 (1983-05-01), Nakahata et al.
patent: 4392735 (1983-07-01), Oka
Minolta Camera Kabushiki Kaisha
Prescott A. C.
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