US4165965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backup roll cleaning system for a heated roll fuser
Assignee: International Business Machines Corp
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Filing: 1978-04-03
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Granted: 1979-08-28
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Expires: 1998-04-03
Abstract
Abstract A hot roll fuser includes a heated roller and a substantially non-deformable backup roll forming a nip through which a carrier with unfused toner may pass, the toner becoming fused by virtue of the heating action from the hot roll. A cleaning arrangement for cleaning the backup roll comprises a support and a pair of scraping blades, each supported in contacting relationship with the backup roll. To insure good scraping action, each of the blades has a serrated or interrupted scraping edge, and the serrations or interruptions of the first and second blades are offset so that the entire surface area of the backup roll is scraped either by the first or second blades, or both.
Inventors
- 👤 William J. Bernardelli
- 👤 Fred Y. Brandon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:35
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2017; G03G15/2025
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
155 words
In a roll fuser including a main roller and a backup roll with surfaces of said main roller and said backup roll forming a nip through which a carrier with unfused toner may pass, an improvement for cleaning said backup roll comprising: a first scraper blade, a second scraper blade, support means for supporting said first and second scraper blades in a fixed position with respect to said backup roll with each said blade in contacting relationship with the surface of said backup roll, both said first and second scraper blades having a scraping edge with an interrupted surface contacting said backup roll to thereby leave areas of said backup roll surface unscraped by said first or second scraper blade, interruptions in said first scraper blade offset with respect to interruptions in said second scraper blade whereby at least one backup roll surface area unscraped by said first blade is scraped by said second blade.
Claim 2
Dependent Claim
155 words
In a roll fuser including a main roller and a backup roll with surfaces of said main roller and said backup roll forming a nip through which a carrier with unfused toner may pass, an improvement for cleaning said backup roll comprising: a first scraper blade, a second scraper blade, support means for supporting said first and second scraper blades in a fixed position with respect to said backup roll with each said blade in contacting relationship with the surface of said backup roll, both said first and second scraper blades having a scraping edge with an interrupted surface contacting said backup roll to thereby leave areas of said backup roll surface unscraped by said first or second scraper blade, interruptions in said first scraper blade offset with respect to interruptions in said second scraper blade whereby at least one backup roll surface area unscraped by said first blade is scraped by said second blade.
Claim 3
Dependent Claim
28 words
The apparatus of claim 1 wherein interruptions in said first and second scraper blade edges are located at regular equal intervals along said first and second scraper blades.
Claim 4
Dependent Claim
56 words
The apparatus of claim 1 wherein said backup roll is mounted on a shaft for rotatable movement and in which said support means includes: a pair of arms mounted on said shaft, a pivot shaft secured between said arms, and body means supporting said first and second scraper blades for pivotal movement about said pivot shaft.
Claim 5
Dependent Claim
31 words
The apparatus of claim 3 which includes biasing means biasing said body means against said arms for rotatable movement about said pivot shaft for loading said blades against said backup roll.
Claim 6
Dependent Claim
47 words
The apparatus of claim 1 wherein each of said first and second scraper blades is supported by said support means at an angle of about 20° to a tangent to said backup roll at a point of contact between the associated blade edge and backup roll surface.
Claim 7
Dependent Claim
55 words
The apparatus of claim 5 in which said support means includes: loading means to bias said blades against said backup roll and in which said support means supports said first scraper blade at an angle of about 19° with a tangent to said backup roll when loaded against said backup roll by said loading means.
Claim 8
Dependent Claim
27 words
The apparatus of claim 1 wherein said backup roll comprises an uncoated steel roll and wherein each of said first and second scraper blades comprise spring steel.
Claim 9
Dependent Claim
27 words
The apparatus of claim 1 wherein said backup roll comprises a plated steel roll and wherein each of said first and second scraper blades comprises spring steel.
Claim 10
Dependent Claim
51 words
The apparatus of claim 1 wherein said first scraper blade has interruptions in said edge spaced at regular intervals, said second scraper blade has interruptions in said edge spaced at regular intervals, and in which blade interruption in said first blade are offset with respect to interruptions in said second blade.
Claim 11
Dependent Claim
91 words
A roll fuser for an electrostatic copying machine including: a main roll, mounted on a first shaft, a backup roll, mounted on a second shaft, means for rotating a one of said main or backup rolls and for forming a nip therebetween for transferring paper and simultaneously fusing toner on said paper, a backup roll cleaning means including: a pair of serrated scraper blades, means for supporting said blades in scraping relation to said backup roll with serrations in a first blade offset with respect to serrations in said second blade.
Claim 12
Dependent Claim
91 words
A roll fuser for an electrostatic copying machine including: a main roll, mounted on a first shaft, a backup roll, mounted on a second shaft, means for rotating a one of said main or backup rolls and for forming a nip therebetween for transferring paper and simultaneously fusing toner on said paper, a backup roll cleaning means including: a pair of serrated scraper blades, means for supporting said blades in scraping relation to said backup roll with serrations in a first blade offset with respect to serrations in said second blade.
Claim 13
Dependent Claim
37 words
The apparatus of claim 10 in which serrations in said first blade are located at regular intervals along said blade and in which serrations in said second blade are located at regular intervals along said second blade.
Claim 14
Dependent Claim
46 words
The apparatus of claim 10 in which means for supporting includes: a pair of arms mounted on said second shaft, a pivot shaft secured between said arms, and body means supporting said pair of serrated scraper blades and mounted for pivotable movement about said pivot shaft.
Claim 15
Dependent Claim
25 words
The apparatus of claim 12 which includes biasing means biasing said body means against said arms for loading said serrated blades against said backup roll.
Claim 16
Dependent Claim
33 words
The apparatus of claim 13 in which each of said blades makes an angle of about 20° relative to said backup roll at a tangent to said backup roll at a contact point.
Claim 17
Dependent Claim
13 words
The apparatus of claim 14 wherein each of said blades comprise spring steel.
Claim 18
Dependent Claim
12 words
The apparatus of claim 15 wherein said backup roll comprises uncoated steel.
Claim 19
Dependent Claim
12 words
The apparatus of claim 15 wherein said backup roll comprises plated steel.
Claim 20
Dependent Claim
13 words
The apparatus of claim 17 wherein said backup roll comprises chrome plated steel.
Claim 21
Dependent Claim
13 words
The apparatus of claim 17 wherein said backup roll comprises nickel plated steel.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-27 | 1983-02-26 | 1983-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-27 | 1987-02-26 | 1987-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-27 | 1991-02-26 | 1991-08-28 | $7700.00 | Window Closed / Lapsed |