Photocopying – Contact printing – Light boxes
Patent
1989-06-15
1990-03-27
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355251, 355246, 118656, 118657, 118658, G03G 1506, G03G 1509
Patent
active
049125117
ABSTRACT:
A developing device including first and second developing sleeves rotatable in the same direction and being disposed adjacent to each other and magnets unrotatable and fixedly mounted in the respective developing sleeves. The first magnet mounted within the first developing sleeve has a first magnetic pole slightly downstream of the position at which the first developing sleeve and the second developing sleeve are closest to each other with respect to the rotational direction of the first developing sleeve. The second magnet mounted within the second developing sleeve has a second magnetic pole slightly upstream of the above-described closest position with respect to the rotational direction of the second developing sleeve. A developer being transported by the first developing sleeve on the peripheral surface thereof is attracted by the second magnetic pole of the second developing sleeve in the region in which the first and second developing sleeves confront each other, thus being transferred easily from the peripheral surface of the first sleeve to that of the second sleeve. A developer being transported by the second developing sleeve on the peripheral surface thereof is attracted by the first magnetic pole of the first developing sleeve in the region in which both developing sleeves confront each other, thus being transferred easily from the peripheral surface of the second sleeve to that of the first sleeve. A repellent magnetic field is generated by the first and second magnetic poles between the region in which both developing sleeves confront each other.
REFERENCES:
patent: 3608522 (1971-09-01), Davidson
patent: 3855969 (1974-12-01), Andrako
patent: 4048957 (1977-09-01), Tagawa
patent: 4436055 (1984-03-01), Yamashita et al.
patent: 4575218 (1986-03-01), Sakamoto et al.
patent: 4800412 (1989-01-01), Ueda
patent: 4833504 (1989-05-01), Parker et al.
patent: 4851872 (1989-07-01), Murasaki et al.
Grimley A. T.
Minolta Camera Kabushiki Kaisha
Ramirez Nestor R.
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