Photocopying – Contact printing – Light boxes
Patent
1990-08-03
1993-11-30
Grimley, A. T.
Photocopying
Contact printing
Light boxes
118658, 355215, G03G 1508
Patent
active
052670074
ABSTRACT:
A developing apparatus is provided with a container for containing a developer having magnetic particles. A rotatable member is rotatable in contact with the developer in the container. The rotatable member is supported in the container by a bearing. A magnetic member encloses at least a portion of the rotatable member at a position adjacent to the bearing. The rotatable member comprises a ferromagnetic material disposed at least at a portion facing the magnetic member. The ferromagnetic material is magnetized by the magnetic member, and a magnetic field formed between the magnetic member and the ferromagnetic material forms a magnetic brush of the developer between the magnet member and the rotatable member.
REFERENCES:
patent: 3783828 (1974-01-01), Forgo et al.
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patent: 4213617 (1980-07-01), Salger
patent: 4387664 (1983-01-01), Hosono et al.
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patent: 4449810 (1984-05-01), Ikesue et al.
patent: 4563978 (1986-01-01), Nakamura et al.
patent: 4596455 (1986-06-01), Kohyama et al.
patent: 4838200 (1989-06-01), Hosoi et al.
Itoh Masahiro
Sakemi Yuji
Watanabe Akira
Grimley A. T.
Ramirez Nestor R.
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