# US 7,020,427 B2 · Carrier pickoff system suitable for customer-replaceable xerographic printer cartridges

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- Number: US 7,020,427 B2
- Document ID: US7020427B2
- Status: Granted
- Kind: B2
- Application number: 10/892,862
- Filed: 2004-07-15
- Published: 2006-01-19
- Granted: 2006-03-28
- Earliest claimed: 2004-07-15
- Assignees: Xerox Corporation
- Inventors: Steven C. Hart
- Web page: https://patentgrep.com/patent/US7020427B2

## CPC

- G03G 21/1814: {Details of parts of process cartridge, e.g. for charging, transfer, cleaning, developing (G03G21/1835 takes precedence)}
- G03G 21/0047: {using electrostatic or magnetic means; Details thereof, e.g. magnetic pole arrangement of magnetic devices (G03G21/0064 takes precedence)}
- G03G 2221/0005: Cleaning of residual toner
- G03G 2221/0078: Magnetic
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A xerographic printer or copier includes a replaceable cartridge having a cleaning blade and carrier particle pickoff member associated with a rotating charge receptor. As the cartridge is being used, carrier particles removed from the photoreceptor by the cleaning blade are magnetically retained on the pickoff member, where the remain for the balance of the lifetime of the cartridge. When a useable lifetime of the cartridge is spent, the carrier particles are removed from the pickoff blade.

## Claims

### Claim 1

A cartridge for operating within a xerographic printing apparatus, comprising:
a blade for engaging a rotatable charge receptor;
a pickoff member, having magnetic properties associated therewith, disposed near the photoreceptor, the pickoff member magnetically retaining carrier particles thereon for a lifetime of the cartridge.

### Claim 2 (depends on 1)

The cartridge of claim 1, further comprising
a rotatable charge receptor.

### Claim 3 (depends on 1)

The cartridge of claim 1, further comprising
a supply of marking material, the supply including carrier articles.

### Claim 4 (depends on 1)

The cartridge of claim 1, the cartridge not including a member for removing a carrier particle from the pickoff member.

### Claim 5 (depends on 1)

The cartridge of claim 1, the pickoff member being spaced between 0.5 mm and 2.0 mm from the charge receptor.

### Claim 6 (depends on 1)

The cartridge of claim 1, the pickoff member including a permanent magnet.

### Claim 7 (depends on 1)

The cartridge of claim 1, the pickoff member including a blade with ferro-magnetic properties.

### Claim 8

A method of operating at least one xerographic printing apparatus, comprising:
removing from a xerographic printing apparatus a cartridge, the cartridge including a blade for engaging a rotatable charge receptor and a pickoff member disposed near the blade and photoreceptor, the pickoff member magnetically retaining carrier particles thereon; and
removing retained carrier particles from the pickoff member, using a wiper which is not part of the cartridge.

### Claim 9 (depends on 8)

The method of claim 8, further comprising
installing the cartridge in a xerographic printing apparatus.

### Claim 10 (depends on 8)

The method of claim 8, the cartridge further comprising
a rotatable charge receptor.

### Claim 11 (depends on 8)

The method of claim 8, further comprising
replacing the rotatable charge receptor.

### Claim 12 (depends on 8)

The method of claim 8, further comprising
providing to the cartridge a supply of marking material.

### Claim 13 (depends on 8)

The method of claim 8, the pickoff member of the cartridge being disposed along the blade.

### Claim 14 (depends on 8)

The method of claim 8, the pickoff member of the cartridge being spaced between 0.5 mm and 2.0 mm from the charge receptor.

### Claim 15 (depends on 8)

The method of claim 8, the pickoff member including a permanent magnet.

### Claim 16 (depends on 8)

The method of claim 8, the pickoff member including a blade with ferro-magnetic properties.