Photocopying – Contact printing – Light boxes
Patent
1992-05-28
1993-11-09
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355251, 355260, G03G 1509
Patent
active
052607488
ABSTRACT:
An electrostatic image developer dispenser forms a uniformly thick and uniformly charged layer of developer particles on a transport surface of a conveyor for delivering particles from a reservoir to a development region adjacent to a photoreceptor. A magnet bar assembly inside the tubular conveyor attracts particles to the transport surface for conveyance to the development region. A magnetic doctor blade presents a surface parallel to the transport surface to establish a regulating gap between the doctor blade surface and the transport surface. The doctor blade extends in the transport direction from opposite one pole of the magnet bar assembly toward an opposite pole downstream from the one pole, to concentrate and orient the magnetic field in the particle layer formation area. In one embodiment, the magnet bar assembly has a pole plate opposite from the doctor blade surface and angularly offset therefrom in a direction opposite to the transport direction. In another embodiment, the magnet bar assembly has two pairs of opposed magnets. A scraper blade bears against the transport surface to remove developer particles from the transport surface after they have passed through the development region. A cleaning blade is provided in the dispenser that bears against the photoreceptor to remove developer particles therefrom upstream from the development region and recycle the removed particles back into the reservoir.
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Brase Sandra L.
Grimley A. T.
Infographix, Inc.
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