Browse Prior Art Database

Magnetic Brush Developer

IP.com Disclosure Number: IPCOM000084756D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Daniels, RA: AUTHOR [+2]

Abstract

This magnetic brush developer includes a bead control doctor blade which is critically mounted relative to the brush roll's normal magnetic field.

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Magnetic Brush Developer

This magnetic brush developer includes a bead control doctor blade which is critically mounted relative to the brush roll's normal magnetic field.

Fig. 1 is a side view of a photoconductor drum 10 whose latent image is to be toned by a developer mix which is carried on the face of nonmagnetic cylinder 11, as this cylinder rotates counterclockwise. The developer mix includes magnetically permeable carrier beads 19 which carry the toner to developing nip B by virtue of the cylinder's rotation.

Stationary magnets 12, 13 and 14 are mounted on nonmagnetic rod 15 and operate to form a normal field at areas A and B. Area B is the above-mentioned developing nip. Nonmagnetic bead control doctor blade 16 is pivotally mounted at 17 and is manually adjusted to produce a desired mix thickness downstream of the blade.

The mix flow rate, as well as the uniformity of the mix flow along the axis of cylinder 11, is accurately controlled by placing blade 16 such that its cutoff edge 18 operates in the normal magnetic field produced by magnets 12 and 13. In this field the carrier beads 19 align themselves in radial fashion relative to the rotational axis of cylinder 11.

Fig. 2 is an enlarged view showing carrier beads 19 so aligned, and showing edge 18 operating to doctor the bead flow. Edge 18 is preferably of the same radius as the carrier beads, to prevent damage to the beads. The generally cylindrical undersurface 20 of the doctor blade 16 operates to de...