Patent US3857558A successfully refreshed from Google Patents.
US3857558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper cassette design with irregular bottom
Assignee: Xerox Corp
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Filing: 1973-06-21
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Granted: 1974-12-31
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Expires: 1993-06-21
Abstract
Abstract A sheet feeding apparatus as provided wherein the surface for supporting a stack of sheet material includes an inclined surface portion positioned between the leading edge of the stack and the feeding means. The inclined surface coacts with the feeding means to elevate the leading edge of the top most sheet away from the next adjacent sheet as it is fed from the stack. Preferably the sheet feeding apparatus comprises a reverse buckle type sheet feeder. The sheet feeding apparatus is adapted to elevate the leading edge of the top most sheet as it is being fed to thereby improve sheet separation and reduce jamming propensity.
Inventors
- 👤 S Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:09
CPC Classifications
B; B65; B65H; B65H1/00; B65H1/26; B65H1/266; B65H1/04; B65H3/00; B65H3/02; B65H3/06; B65H3/0623
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
A sheet feeding apparatus comprising: support means for supporting a stack of sheet material on top thereof, said support means including at least one inclined surface for deforming said sheet material supported thereon to form a protuberance in the top most sheet, means coacting with said protuberance for elevating the leading edge of said top sheet as it is fed from said stack, said elevating means including feeding means arranged to contact the top most sheet of said stack for feeding the top most sheet from said stack, said inclined surface being positioned between the leading edge of said stack and said feeding means.
Claim 2
Dependent Claim
104 words
A sheet feeding apparatus comprising: support means for supporting a stack of sheet material on top thereof, said support means including at least one inclined surface for deforming said sheet material supported thereon to form a protuberance in the top most sheet, means coacting with said protuberance for elevating the leading edge of said top sheet as it is fed from said stack, said elevating means including feeding means arranged to contact the top most sheet of said stack for feeding the top most sheet from said stack, said inclined surface being positioned between the leading edge of said stack and said feeding means.
Claim 3
Dependent Claim
29 words
An apparatus as in claim 1 wherein said protuberance includes a leading upwardly rising portion and wherein said feed means is positioned closely adjacent to said upwardly rising portion.
Claim 4
Dependent Claim
25 words
An apparatus as in claim 2 wherein said inclined portion has a convexly curved shape which provides a smoothly deformed surface which constitutes said protuberance.
Claim 5
Dependent Claim
15 words
An apparatus as in claim 2 wherein said feedIng means comprises at least one roll.
Claim 6
Dependent Claim
58 words
An apparatus as in claim 4 wherein said elevating means includes means to deflect said sheet in the area of said protuberance to elevate the leading edge thereof, said deflecting means comprising the nip formed between said roll and said top most sheet with said nip being positioned immediately adjacent the leading upwardly rising portion of said protuberance.
Claim 7
Dependent Claim
22 words
An apparatus as in claim 5 wherein said nip is within about one-half inch of said upwardly rising portion of said protuberance.
Claim 8
Dependent Claim
53 words
An apparatus as in claim 5 wherein said inclined surface and associated protuberance are positioned sufficiently close to the leading edge of said stack so that the leading edge of said top most sheet after deflection about said protuberance is elevated from the next adjacent sheet as it is fed from said stack.
Claim 9
Dependent Claim
28 words
An apparatus as in claim 7 wherein the leading upwardly rising portion of said protuberance is positioned within about 8 inches of the leading edge of said stack.
Claim 10
Dependent Claim
45 words
An apparatus as in claim 8 wherein said sheet feeding apparatus comprises a reverse buckle sheet feeder wherein said feed roll is adapted to advance said top most sheet first rearwardly to form a buckle and then forwardly to feed said sheet from said stack.
Claim 11
Dependent Claim
19 words
An apparatus as in claim 9 further including snubber means contacting the leading edge of said top most sheet.
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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |