Browse Prior Art Database

Mechanically Compliant (Self Adjusting) Developer Unit

IP.com Disclosure Number: IPCOM000087777D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Williams, EM: AUTHOR

Abstract

This magnetic brush developer is mounted for two degrees of movement along the line adjoining the axes of rotation of the photoconductor drum and the magnetic brush roll so that the developer can adjust itself to the orientation of the photoconductor surface.

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Mechanically Compliant (Self Adjusting) Developer Unit

This magnetic brush developer is mounted for two degrees of movement along the line adjoining the axes of rotation of the photoconductor drum and the magnetic brush roll so that the developer can adjust itself to the orientation of the photoconductor surface.

As shown in Fig. 1, the photoconductor drum 10 is mounted for rotation about its axis 12. The magnetic brush developer roll 14 is mounted for rotation about its axis 16 with freedom to move in and out (as shown by the arrows) with respect to the photoconductor drum surface to maintain an optimum gap between the magnetic brush roll 14 and the photoconductor surface.

Fig. 2 shows the entire developer unit 20 supported by roller bearings 22 and ball bearings 24 to provide rotation about the orthogonal axes and thereby providing a self-adjusting mounting for the developer unit. In this embodiment the magnetic brush developer roll 14 is rigidly supported within the developer unit
20.

The apparatus shown in Fig. 3 utilizes independent suspension of the ends of the magnetic brush developer roll. This embodiment has the advantage that low inertial forces are present since only the mass of the magnetic brush developer roll 14 is displaced. The magnetic brush developer roll is supported at each end by a load 30 which provides a loading force toward the photoconductor drum surface. This loading force can be obtained in a number of ways. For example, compression springs with a spring constant on the order of 100...