US4192497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for the surface of sheet separating devices
Assignee: Xerox Corp
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Filing: 1977-02-28
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Granted: 1980-03-11
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Expires: 1997-02-28
Abstract
Abstract A composition is described for use on the surface of separating members or devices used in separating superposed sheets. Good sheet separation is obtained without delamination of the sheets when microcellular elastomeric materials having a hardness of at least 25 durometer are used as the surface material of the sheet separating devices. The sheet separating devices having the described surface material, have utility as retarding rolls and abutment members in sheet feeders, such as in xerographic apparatus.
Inventors
- 👤 William D. Perun
- 👤 Paul C. Amatangelo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:46
CPC Classifications
B; B65; B65H; B65H3/00; B65H3/46; B65H3/52; B65H3/5207; G; G03; G03G; G03G15/00; G03G15/65; B65H2401/00; B65H2401/10; G03G2215/00; G03G2215/00362; G03G2215/00367; G03G2215/00371; G03G2215/004; G03G2215/00535; G03G2215/00679
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
48 words
In an apparatus for separating and feeding sheets by means of a sheet separating and feeding device having a retard member the surface of which is a friction member formed of a resilient material, the surface comprising a microcellular elastomer having a hardness of at least 25 durometer.
Claim 2
Dependent Claim
48 words
In an apparatus for separating and feeding sheets by means of a sheet separating and feeding device having a retard member the surface of which is a friction member formed of a resilient material, the surface comprising a microcellular elastomer having a hardness of at least 25 durometer.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 wherein the density of the microcellular elastomer is about 46.8±10 pounds/foot 3 .
Claim 4
Dependent Claim
21 words
The apparatus of claim 1 wherein the tensile strength of the microcellular elastomer is at least 180 pounds per square inch.
Claim 5
Dependent Claim
18 words
The apparatus of claim 1 wherein the tear strength of the microcellular elastomer is at least 8.0 pounds/inch.
Claim 6
Dependent Claim
18 words
The apparatus of claim 1 wherein the ultimate elongation of the microcellular elastomer is at least 230 percent.
Claim 7
Dependent Claim
19 words
The apparatus in claim 1 wherein 25 percent compression deflection of the microcellular elastomer occurs at about 50±15 pounds.
Claim 8
Dependent Claim
18 words
The apparatus of claim 1 wherein the microcellular cell size of the microcellular elastomer is about 0.005 inch.
Claim 9
Dependent Claim
17 words
The apparatus of claim 1 wherein the microcellular elastomer has irregular voids or craters spaced randomly therethrough.
Claim 10
Dependent Claim
30 words
The apparatus of claim 1 wherein the microcellular elastomer is a polyurethane which is subjected to a foaming process to reduce the hardness to values above at least 25 durometer.
Claim 11
Dependent Claim
49 words
In a method of separating superposed sheets by providing a resilient surface having frictional contact with the sheets, the improvement comprising contacting said superposed sheets with a microcellular elastomer surface having a hardness of at least 25 durometer whereby excellent sheet separation is obtained without delamination of the sheets.
Claim 12
Dependent Claim
49 words
In a method of separating superposed sheets by providing a resilient surface having frictional contact with the sheets, the improvement comprising contacting said superposed sheets with a microcellular elastomer surface having a hardness of at least 25 durometer whereby excellent sheet separation is obtained without delamination of the sheets.
Claim 13
Dependent Claim
18 words
The method of claim 10 wherein the density of the microcellular elastomer is about 46.8±10 pounds/foot 3 .
Claim 14
Dependent Claim
21 words
The method of claim 10 wherein the tensile strength of the microcellular elastomer is at least 180 pounds per square inch.
Claim 15
Dependent Claim
18 words
The method of claim 10 wherein the tear strength of the microcellular elastomer is at least 8.0 pounds/inch.
Claim 16
Dependent Claim
18 words
The method of claim 10 wherein the ultimate elongation of the microcellular elastomer is at least 230 percent.
Claim 17
Dependent Claim
19 words
The method of claim 10 wherein 25 percent compression deflection of the microcellular elastomer occurs at about 50±15 pounds.
Claim 18
Dependent Claim
18 words
The method of claim 10 wherein the microcellular cell size of the microcellular elastomer is about 0.005 inch.
Claim 19
Dependent Claim
17 words
The method of claim 10 wherein the microcellular elastomer has irregular voids or craters spaced randomly therethrough.
Claim 20
Dependent Claim
30 words
The method of claim 10 wherein the microcellular elastomer is a polyurethane which is subjected to a foaming process to reduce the hardness to values above at least 25 durometer.
Claim 21
Dependent Claim
106 words
A retarding member for separating superposed sheets without delamination of the lead edge of sheets and feeding said sheets into a xerographic machine comprising a surface in frictional contact with the superposed sheets, the surface consisting of a microcellular polyurethane subjected to a foaming process to reduce the hardness thereof to above at least 25 durometer, the microcellular polyurethane foam produced thereby having a density of about 46.8±10 pounds/foot 3 , a tensile strength of at least 180 pounds/inch 2 , a tear strength of at least 8.0 pounds/inch, an ultimate elongation of at least 230 percent and 25 percent compression deflection at about 50±15 pounds.
Claim 22
Dependent Claim
106 words
A retarding member for separating superposed sheets without delamination of the lead edge of sheets and feeding said sheets into a xerographic machine comprising a surface in frictional contact with the superposed sheets, the surface consisting of a microcellular polyurethane subjected to a foaming process to reduce the hardness thereof to above at least 25 durometer, the microcellular polyurethane foam produced thereby having a density of about 46.8±10 pounds/foot 3 , a tensile strength of at least 180 pounds/inch 2 , a tear strength of at least 8.0 pounds/inch, an ultimate elongation of at least 230 percent and 25 percent compression deflection at about 50±15 pounds.
Claim 23
Dependent Claim
27 words
The retarding member of claim 19 wherein the microcellular polyurethane has a microcellular cell size of about 0.005 inch and irregular voids or craters spaced randomly therethrough.
References Cited (Backward Citations)
US3469834A
Cited
US3768803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |