Molding assembly for producing magnetic development rollers havi

Details Molding assembly for producing magnetic development rollers havi Molding assembly for producing magnetic development rollers havi

1998-07-28

1999-12-14

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

425DIG33, 264427, B28B 1700

Patent

active

060009225

ABSTRACT:
A molding assembly for producing a magnetic development roller having relatively precise magnetic development fields for use in an electrostatographic reproduction machine to develop a latent image recorded on a photoconductive member of the machine. The molding assembly includes a cylindrical member having a first end, a second end, a first radius, and a shell portion. The shell portion includes an outer surface, and an inner surface defining a molding cavity that has a second radius corresponding to an outer radius of a magnetic development roller molded within the molding cavity. The molding assembly also includes a plurality of circumferentially spaced channels formed within the shell portion, with each channel of the plurality having generally parallel walls, and being located immediately adjacent the inner surface of the shell portion for containing a permanent magnet suitable for inducing a magnetic field in a magnetic development roller molded within the molding cavity. A permanent magnet is placed within each channel of the plurality of channels, and is spaced from each wall of the parallel walls of each channel. As placed, the permanent magnet defines an adjustment space therefor with each wall of the parallel walls. Importantly, the molding assembly includes an adjustment device for precisely adjusting a magnetizing position of the permanent magnet within the adjustment space. The adjustment device includes at least one pair of first members for adjustably moving the permanent magnet radially relative to a center of the molding cavity, and at least one pair of second members for translating the permanent magnet non-radially relative to a center of the molding cavity, thus efficiently adjusting the magnetizing position of the permanent magnet for inducing relatively precise magnetic development fields in a magnetic development roller molded within the molding cavity.

REFERENCES:
patent: 4557582 (1985-12-01), Kan et al.
patent: 4604042 (1986-08-01), Tanigawa et al.
patent: 5019796 (1991-05-01), Lee et al.
patent: 5181971 (1993-01-01), Ohtsuka

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