Method for treating magnet roll by blasting with nonmagnetic sph

Details Method for treating magnet roll by blasting with nonmagnetic sph Method for treating magnet roll by blasting with nonmagnetic sph

1995-07-27

1997-03-04

Braun, Fred L.

Electrophotography

Image formation

Development

G03G 1509

Patent

active

056085028

ABSTRACT:
A method for treating a magnet roll including the steps of providing a permanent magnet member having an outer circumferential surface and a plurality of axially extending magnetic poles formed in the outer circumferential surface, slidably surrounding the member with a non-magnetic metal sleeve of hollow cylindrical shape, the sleeve and the member being rotatable relative to each other, blasting a surface of the sleeve with spherical particles of a non-magnetic material having a density in a range of from 3 to 4 g/cm.sup.3 and Mohs' hardness in a range of from 11 to 14 to produce a surface roughness (R.sub.z) in a range of from 0.5 to 8 .mu.m.

REFERENCES:
patent: 4554234 (1985-11-01), Imai et al.
patent: 4559899 (1985-12-01), Kan et al.
patent: 4597661 (1986-07-01), Yamashita
patent: 5185496 (1993-02-01), Nishimura et al.
patent: 5215845 (1993-06-01), Yuso et al.
patent: 5286917 (1994-02-01), Unno et al.

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