US4253008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fusing apparatus
Assignee: Pitney Bowes Inc
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Filing: 1979-06-13
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Granted: 1981-02-24
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Expires: 1999-06-13
Abstract
Abstract A fusing apparatus comprises a heated roll fuser member; an endless belt which engages a portion of the peripheral surface of the heated roll fuser member to form an area through which substrates carrying toner images thereon move; first charging apparatus for applying an electrostatic charge to the belt opposite in polarity to the charge on the toner particles, the charging apparatus being positioned adjacent the belt so as to charge the portion of the belt supporting the substrate prior to it passing between the heated fuser roll and the belt; and second charging apparatus for applying an electrostatic charge on the fuser roll.
Inventors
- 👤 Donald T. Dolan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:59
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064; G03G15/206; G03G2215/00; G03G2215/20; G03G2215/2003; G03G2215/2009
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
118 words
A fuser apparatus comprising: a heated roll fuser member; an endless belt engaging a portion of the peripheral surface of said heated roll fuser member to form an area through which substrates carrying toner images thereon move; and electrostatic means for preventing toner particles from transferring onto said fuser roll including, first charging means for applying an electrostatic charge to said belt opposite in polarity to the charge on the toner particles, the charging means being positioned adjacent said belt to apply said charge to the portion of said belt supporting said substrate prior to it passing between said heated roll fuser and said belt; and second charging means for applying an electrostatic charge on said fuser roll.
Claim 2
Dependent Claim
118 words
A fuser apparatus comprising: a heated roll fuser member; an endless belt engaging a portion of the peripheral surface of said heated roll fuser member to form an area through which substrates carrying toner images thereon move; and electrostatic means for preventing toner particles from transferring onto said fuser roll including, first charging means for applying an electrostatic charge to said belt opposite in polarity to the charge on the toner particles, the charging means being positioned adjacent said belt to apply said charge to the portion of said belt supporting said substrate prior to it passing between said heated roll fuser and said belt; and second charging means for applying an electrostatic charge on said fuser roll.
Claim 3
Dependent Claim
17 words
A fuser apparatus according to claim 1 wherein said first charging means is a D.C. corona device.
Claim 4
Dependent Claim
36 words
A fusing apparatus according to claim 1 wherein said second charging means is a D.C. corona device for applying a charge on said fuser roll having the same polarity as the charge on said toner particles.
Claim 5
Dependent Claim
33 words
A fusing apparatus according to claim 1 wherein said second charging means is an A.C. corona device for applying a charge on said fuser roll sufficient to neutralize any charge on the roll.
Claim 6
Dependent Claim
52 words
A fusing apparatus according to claim 1 further comprising a series of rollers upon which said endless belt is mounted, at least one of said rollers being movably mounted such that the size of the area of contact between said peripheral surface of the heated roll fuser and said belt is adjustable.
Claim 7
Dependent Claim
22 words
A fuser apparatus according to claim 1 wherein said belt is made of a flexible heat-resistant material having a low thermal conductivity.
Claim 8
Dependent Claim
15 words
A fuser apparatus according to claim 6 wherein said belt is made of silicone rubber.
Claim 9
Dependent Claim
124 words
A fuser apparatus comprising: a heated roll fuser member; an endless belt engaging a portion of the peripheral surface of said heated roll fuser member to form an area through which substrates carrying toner images thereon move; and electrostatic means for preventing toner particles from transferring onto said fuser roll including, a D.C. corona device for applying an electrostatic charge to said belt opposite in polarity to the charge on the toner particles, said device being positioned adjacent said belt to apply said charge to the portion of said belt supporting said substrate prior to it passing between said heated roll fuser and said belt; and an A.C. corona device positioned adjacent said heated roll fuser for neutralizing any charges on the roll fuser.
Claim 10
Dependent Claim
124 words
A fuser apparatus comprising: a heated roll fuser member; an endless belt engaging a portion of the peripheral surface of said heated roll fuser member to form an area through which substrates carrying toner images thereon move; and electrostatic means for preventing toner particles from transferring onto said fuser roll including, a D.C. corona device for applying an electrostatic charge to said belt opposite in polarity to the charge on the toner particles, said device being positioned adjacent said belt to apply said charge to the portion of said belt supporting said substrate prior to it passing between said heated roll fuser and said belt; and an A.C. corona device positioned adjacent said heated roll fuser for neutralizing any charges on the roll fuser.
Claim 11
Dependent Claim
114 words
A fuser apparatus comprising: a heated roll fuser member; an endless belt engaging a portion of the peripheral surface of said heated roll fuser member to form an area through which substrates carrying toner images thereon move; and electrostatic means for preventing toner particles from transferring onto said fuser roll including, first charging means for applying an electrostatic charge to the bottom surface of said belt opposite in polarity to the charge on the toner particles; second charging means for applying an electrostatic charge to the upper surface of said belt opposite in polarity to the charge on the toner particles; and third charging means for applying an electrostatic charge on said fuser roll.
Claim 12
Dependent Claim
114 words
A fuser apparatus comprising: a heated roll fuser member; an endless belt engaging a portion of the peripheral surface of said heated roll fuser member to form an area through which substrates carrying toner images thereon move; and electrostatic means for preventing toner particles from transferring onto said fuser roll including, first charging means for applying an electrostatic charge to the bottom surface of said belt opposite in polarity to the charge on the toner particles; second charging means for applying an electrostatic charge to the upper surface of said belt opposite in polarity to the charge on the toner particles; and third charging means for applying an electrostatic charge on said fuser roll.
Claim 13
Dependent Claim
18 words
A fuser apparatus according to claim 9 wherein said first and second charging means are D.C. corona devices.
Claim 14
Dependent Claim
36 words
A fusing apparatus according to claim 9 wherein said third charging means is a D.C. corona device for applying a charge on said fuser roll having the same polarity as the charge on said toner particles.
Claim 15
Dependent Claim
33 words
A fusing apparatus according to claim 9 wherein said third charging means is an A.C. corona device for applying a charge on said fuser roll sufficient to neutralize any charge on the roll.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |