Patent US3601389A successfully refreshed from Google Patents.
US3601389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet feeding apparatus
Assignee: Xerox Corp
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Filing: 1969-07-03
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Granted: 1971-08-24
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Expires: 1989-07-03
Abstract
Abstract Apparatus to separate and feed individual sheets from the top of a stack in which a snubber plate, acting in conjunction with a knife edge retaining bar, is biased into contact with each forward corner of the topmost sheet in said stack to cause a sheet of predetermined beam strength to be buckled by said snubber and to cause a sheet of greater beam strength to pass between the snubber and the retaining bar.
Inventors
- 👤 William E Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:31
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6502; B; B65; B65H; B65H3/00; B65H3/46; B65H3/54; B65H3/56; G03B; G03B17/00; G03B17/28; G03B17/32; G03B17/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
204 words
In the sheet feeding device of the type wherein the topmost sheet in the stack is forwarded along a predetermined path of travel, sheet separating apparatus including vertical guide members positioned adjacent the forward side margins of the stack, movable support members slidably mounted in each said guide member and being adapted to move in a vertical direction, a snubber plate securely affixed to each said support member and being arranged to overlay the front corners of the topmost sheet in the stack so that a portion of each said plate extends beyond the leading edge of the stack, a retaining bar affixed to each said movable support member and being adapted to contact at least a portion of the leading edge of the stack, each said retaining bar being positioned in relation with the extended portion of said snubber plate to permit sheets in the stack to pass therebetween, biasing means associated with said snubber plates to hold said plates in contact with the corners of the topmost sheet in the stack with sufficient force to buckle sheets of a predetermined beam strength forwarded thereunder and to permit sheets of greater beam strength to pass between said retaining bar and said snubber plate.
Claim 2
Dependent Claim
204 words
In the sheet feeding device of the type wherein the topmost sheet in the stack is forwarded along a predetermined path of travel, sheet separating apparatus including vertical guide members positioned adjacent the forward side margins of the stack, movable support members slidably mounted in each said guide member and being adapted to move in a vertical direction, a snubber plate securely affixed to each said support member and being arranged to overlay the front corners of the topmost sheet in the stack so that a portion of each said plate extends beyond the leading edge of the stack, a retaining bar affixed to each said movable support member and being adapted to contact at least a portion of the leading edge of the stack, each said retaining bar being positioned in relation with the extended portion of said snubber plate to permit sheets in the stack to pass therebetween, biasing means associated with said snubber plates to hold said plates in contact with the corners of the topmost sheet in the stack with sufficient force to buckle sheets of a predetermined beam strength forwarded thereunder and to permit sheets of greater beam strength to pass between said retaining bar and said snubber plate.
Claim 3
Dependent Claim
32 words
The apparatus of claim 1 wherein the top edge of said retaining bar forms an acute angle with the surface of said bar in contact with the leading edge of said stack.
Claim 4
Dependent Claim
53 words
The apparatus of claim 2 wherein the edge of each said snubber plate positioned furthest from the associated side margin of the stack is tapered rearwardly at an acute angle relative to the leading edge of said stack to cause sheets separated thereby to be buckled inwardly towards the center of the stack.
Claim 5
Dependent Claim
16 words
The apparatus of claim 3 wherein each said retaining bar is adjustable in a vertical direction.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |