# US 5,790,923 A · Developing apparatus

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- Number: US 5,790,923 A
- Document ID: US5790923A
- Status: Granted
- Kind: A
- Application number: 08/797,468
- Filed: 1997-02-06
- Granted: 1998-08-04
- Earliest claimed: 1996-02-09
- Assignees: Canon Kabushiki Kaisha
- Inventors: Toru Oguma; Kazushi Watanabe; Atsushi Numagami
- Web page: https://patentgrep.com/patent/US5790923A

## CPC

- G03G 15/0942: {with means for preventing toner scattering from the magnetic brush, e.g. magnetic seals}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A developing apparatus includes a container, having an opening, for containing magnetic developer; a developer carrying member, rotatably disposed in the opening, for carrying the magnetic developer; a magnetic sealing member disposed spaced from a peripheral surface of the developer carrying member; and a guiding member for guiding the developer inwardly in a longitudinal direction of the developer carrying member, the guiding member being disposed adjacent an end, in a peripheral direction of the developer carrying member, of the magnetic sealing member.

## Claims

### Claim 1

A developing apparatus comprising:
a container, having an opening, for containing magnetic developer;
a developer carrying member, rotatably disposed in the opening, for carrying the magnetic developer;
a magnetic sealing member disposed spaced from a peripheral surface of said developer carrying member; and
a guiding member for guiding the magnetic developer inwardly in a longitudinal direction of said developer carrying member, said guiding member being disposed adjacent an end, in a peripheral direction of said developer carrying member, of said magnetic sealing member, and said guiding member having a guiding portion disposed between said magnetic sealing member and said developer carrying member.

### Claim 2 (depends on 1)

An apparatus according to claim 1, wherein the magnetic developer is toner, and said magnetic sealing member includes a magnet for forming a concentrated magnetic field.

### Claim 3 (depends on 1)

An apparatus according to claim 1, wherein said guiding member has an end which is inclined and contacted to said peripheral surface of said developer carrying member.

### Claim 4 (depends on 3)

An apparatus according to claim 3, wherein said end of said guiding member is inclined such that an end, in the longitudinal direction of said developer carrying member, of said end of said guiding member, is downstream with respect to a movement direction of said peripheral surface of said developer carrying member.

### Claim 5 (depends on 1)

An apparatus according to claim 1, wherein said guiding member is disposed adjacent a developer outlet portion.

### Claim 6 (depends on 1)

An apparatus according to claim 1, wherein said guiding member is disposed adjacent a developer returning portion.

### Claim 7 (depends on 1)

An apparatus according to claim 1, wherein said guiding member is extended to outside said magnetic sealing member in a longitudinal direction of said developer carrying member.

### Claim 8 (depends on 1)

An apparatus according to claim 1, wherein said developing apparatus is unified into a cartridge with an image bearing member for bearing an electrostatic image, and said cartridge is detachably mountable to a main assembly of an image forming apparatus.