# US 4,397,264 A · Electrostatic image development system having tensioned flexible recording member

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- Number: US 4,397,264 A
- Document ID: US4397264A
- Status: Granted
- Kind: A
- Application number: 06/169,543
- Filed: 1980-07-17
- Granted: 1983-08-09
- Earliest claimed: 1980-07-17
- Assignees: Xerox Corporation
- Inventors: Gilbert J. Hatch
- Web page: https://patentgrep.com/patent/US4397264A

## CPC

- G03G 15/754: {relating to band, e.g. tensioning (G03G15/757 takes precedence)}
- G03G 15/0812: {characterised by the developer regulating means, e.g. structure of doctor blade}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An apparatus in which a developer roller transports insulating developer material into contact with a flexible member in a development zone so as to develop a latent image recorded thereon. The flexible member is maintained at a preselected tension. In this way, the developer material being transported into contact with the latent image spaces the flexible member from the developer roller. The thickness of the layer of developer material on the developer roller is adjustable to control the spacing between the flexible member and the developer roller. In this way, development of solid areas and lines in the latent image may be optimized.

## Claims

### Claim 1

An apparatus for developing a latent image recorded on a flexible member with an insulating developer material, including:
means, positioned closely adjacent to the flexible member defining a development zone therebetween, for transporting the developer material into contact with the flexible member in the development zone so as to develop the latent image recorded thereon;
means for maintaining the flexible member at a preselected tension of sufficient magnitude so that the developer material being transported into contact therewith spaces the flexible member from said transporting means; and
means for adjusting the thickness of the developer material being transported into the development zone to control the spacing between the flexible member and said transporting means so as to optimize development of solid areas and lines in the latent image.

### Claim 2 (depends on 1)

An apparatus according to claim 1, wherein the flexible member is a belt.

### Claim 3 (depends on 2)

An apparatus according to claim 2, wherein said transporting means includes:
a tubular member journaled for rotary movement;
means for attracting the developer material to said tubular member; and
means for rotating said tubular member to transport the developer material into contact with the latent image in the development zone.

### Claim 4 (depends on 3)

An apparatus according to claim 3, wherein said adjusting means includes:
a blade member having the leading edge thereof positioned adjacent said tubular member to define a gap therebetween; and
means for moving said blade member to adjust the gap so as to control the thickness of the developer material being transported into the development zone.

### Claim 5 (depends on 4)

An apparatus according to claim 4, for developing a latent image with insulating developer material having magnetic particles, wherein:
said tubular member is non-magnetic; and
said attracting means includes an elongated magnet disposed interiorally of and spaced from said tubular member.

### Claim 6

A method of developing a latent image recorded on a flexible member, including the steps of:
transporting an insulating developer material into contact with the flexible member in a development zone so as to develop the latent image recorded thereon;
maintaining the flexible member at a pre-selected tension of sufficient magnitude so that the developer material being transported into contact therewith spaces the flexible member from the developer material transport; and
adjusting the thickness of the developer material being transported into the development zone to control the spacing between the flexible member and the development material transport so as to optimize development of solid areas and lines in the latent image.

### Claim 7 (depends on 6)

A method according to claim 6, wherein said step of transporting includes the steps of:
attracting the developer material to a tubular member; and
rotating the tubular member to transport the developer material attracted thereto into contact with the latent image.

### Claim 8 (depends on 7)

A method according to claim 7, wherein said step of adjusting includes the step of positioning the leading edge of a blade relative to the tubular member to define one gap therebetween for development of lines in the latent image and another gap therebetween for development of solid areas in the latent image.