US3844252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet removal device
Assignee: Xerox Corp
•
Filing: 1973-05-21
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Granted: 1974-10-29
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Expires: 1993-05-21
Abstract
Abstract A sheet removal device for separating an image bearing support sheet from the surface of a heated fuser roll. The removal device is constructed in a configuration and of a material to prevent copy degradation and harming of the fuser roll during the sheet separating operation.
Inventors
- 👤 R Thettu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:05
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2017; G03G15/2028
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
97 words
IN A REPRODUCTION MACHINE WHEREIN A DEVELOPED ELECTTROSTATIC IMAGE IS TRANSFERRED TO A SUITABLE IMAGE BEARING SUPPORT SHEET AND PERMANENTLY AFFIXED THERETO BY HEAT-PRESSURE MEANS INCLUDING A HEATED PRESSURE ROLL, THE IMPROVEMENT COMPRISING: MEANS APPLYING A RELEASE AGENT COATING TO THE HEATED PRESSURE ROLL; A BLADE-LIKE ELEMENT HAVING A CUTTING EDGE FORMED ALONG ONE SIDE THEREOF; AND MEANS FOR SUPPORTING SAID BLADE-LIKE ELEMENT IN CLOSE PROXIMITY TO AN UPPER PORTION OF THE HEATED PRESSURE ROLL WITH THE CUTTING EDGE OF THE BLADE IN A POSITION TO STRIP A SUPPORT SHEET MOVING THEREFROM, SAID BLADE HAVING A RECESS
Claim 2
Dependent Claim
97 words
IN A REPRODUCTION MACHINE WHEREIN A DEVELOPED ELECTTROSTATIC IMAGE IS TRANSFERRED TO A SUITABLE IMAGE BEARING SUPPORT SHEET AND PERMANENTLY AFFIXED THERETO BY HEAT-PRESSURE MEANS INCLUDING A HEATED PRESSURE ROLL, THE IMPROVEMENT COMPRISING: MEANS APPLYING A RELEASE AGENT COATING TO THE HEATED PRESSURE ROLL; A BLADE-LIKE ELEMENT HAVING A CUTTING EDGE FORMED ALONG ONE SIDE THEREOF; AND MEANS FOR SUPPORTING SAID BLADE-LIKE ELEMENT IN CLOSE PROXIMITY TO AN UPPER PORTION OF THE HEATED PRESSURE ROLL WITH THE CUTTING EDGE OF THE BLADE IN A POSITION TO STRIP A SUPPORT SHEET MOVING THEREFROM, SAID BLADE HAVING A RECESS
Claim 3
Dependent Claim
27 words
The apparatus of claim 1 wherein the cutting edge of said blade has a radius formed therein that is greater than the radius of the fuser roll.
Claim 4
Dependent Claim
23 words
The apparatus of claim 2 wherein said recess is a aperture formed in the body of the blade behind the cutting edge thereon.
Claim 5
Dependent Claim
19 words
The apparatus of claim 3 wherein said aperture is filled with a material capable of absorbing said removed oil.
Claim 6
Dependent Claim
26 words
The apparatus of claim 1 wherein said cutting edge contacts the roll surface along a contact line that is tangent to the surface of said roll.
Claim 7
Dependent Claim
35 words
The apparatus of claim 1 wherein the blade has means operatively associated therewith for removing the blade from contacting said roll when the contact force between the roll and the blade exceeds a predetermined pressure.
Claim 8
Dependent Claim
17 words
The apparatus of claim 1 wherein said blade is formed of an aromatic polyester filled with triflouroethylene.
Claim 9
Dependent Claim
20 words
The blade of claim 1 wherein said blade is formed of a polymide which is filled and covered with triflouroethylene.
Claim 10
Dependent Claim
13 words
The blade of claim 1 wherein said blade is formed of an amide-imide.
Claim 11
Dependent Claim
18 words
The apparatus of claim 1 wherein said blade if formed of a metal having relatively high thermal conductivity.
Claim 12
Dependent Claim
16 words
The apparatus of claim 10 wherein said metallic blade is coated with a layer of triflouroethylene.
Claim 13
Dependent Claim
30 words
The apparatus of claim 4 wherein said absorbent material comprises an oil reservoir holding a quantity of said removed oil which is metered to the blade surface by capillary action.
Claim 14
Dependent Claim
25 words
The apparatus of claim 12 wherein said absorbent material comprises a high density wick which is embedded below the sheet contacting surface of said blade.
Claim 15
Dependent Claim
21 words
The apparatus of claim 1 wherein said recess is a channel running along at least one side wall of said blade.
Claim 16
Dependent Claim
22 words
The apparatus of claim 1 wherein said recess is an embossed ridge running along at least one side wall of said blade.
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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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |