Development apparatus having an extended development nip

Details Development apparatus having an extended development nip Development apparatus having an extended development nip

1991-06-24

1993-01-19

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118657, 355251, G03G 1509

Patent

active

051810751

ABSTRACT:
A development apparatus for developing images on an image-bearing surface being moved through a fixed path in a copier or printer includes a magnetic development brush that has a rotatable magnetic core generating a first magnetic field thereabout, and a non-magnetic shell which forms a development nip with the image-bearing surface. The non-magnetic shell is contoured within the development nip so as to follow the shape of the fixed path of the image-bearing surface through such nip. The development brush further includes nip extending shoulder sections, and magnet keepers for forming field magnets within the first magnetic field of the magnetic core. The magnet keepers each generate an auxiliary magnetic field for enhancing and increasing the strength of a resultant magnetic field at and about the shoulder sections thereby enabling the continued forming of a consistent and desirably thick developer material nap around the extended shoulder sections.

REFERENCES:
patent: 3879737 (1975-04-01), Lunde
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patent: 4287850 (1981-09-01), Yamamoto et al.
patent: 4707107 (1987-11-01), Joseph
patent: 4804994 (1989-02-01), Sasaki et al.
patent: 4928145 (1990-05-01), Okamoto et al.
patent: 4980728 (1990-12-01), Funayama et al.
patent: 5080038 (1992-01-01), Rubin

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