US3866901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse buckle feeder
Assignee: Xerox Corp
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Filing: 1973-10-01
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Granted: 1975-02-18
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Expires: 1993-10-01
Abstract
Abstract Apparatus for improving the sheet feeding capability of a reverse buckle feeding mechanism. A pair of feed rolls are placed in contact with the top sheet in a supply stack and are arranged to first move the sheet rearwardly for a short distance and then forward the sheet from the stack in the opposite direction. A stack retaining bar is pivotally mounted in a lever arm to be moved into and out of pressure contact with the main body of the supply stack behind the feed rolls. Control means are operatively associated with the lever arm to move the retaining bar into pressure with the stack when the top sheet therein is moved rearwardly thereby creating a separating buckle in the sheet. The pressure on the bar is then released as the top sheet is forwarded from the stack.
Inventors
- 👤 John L Brock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:44
CPC Classifications
B; B65; B65H; B65H3/00; B65H3/02; B65H3/06; B65H3/0623
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
Apparatus for separating and forwarding individual sheets from a supply stack including: sheet feeding means for engaging the top sheet within a stack for moving said sheet in a first direction toward the rear of said stack and then in the opposite direction along a predetermined path of travel; holddown means for contacting the top sheet in said stack; lever means connected at one end to said holddown means and at the opposite end to said sheet feeding means; control means interposed between said lever means and said sheet feeding means including a one way clutch arranged to force said holddown means into pressure contact against the stack when said sheet feeding means moves said sheet in a rearward direction and to release said holddown pressure when said sheet feeding means moves said sheet in the opposite direction.
Claim 2
Dependent Claim
138 words
Apparatus for separating and forwarding individual sheets from a supply stack including: sheet feeding means for engaging the top sheet within a stack for moving said sheet in a first direction toward the rear of said stack and then in the opposite direction along a predetermined path of travel; holddown means for contacting the top sheet in said stack; lever means connected at one end to said holddown means and at the opposite end to said sheet feeding means; control means interposed between said lever means and said sheet feeding means including a one way clutch arranged to force said holddown means into pressure contact against the stack when said sheet feeding means moves said sheet in a rearward direction and to release said holddown pressure when said sheet feeding means moves said sheet in the opposite direction.
Claim 3
Dependent Claim
35 words
The apparatus of claim 1 wherein said lever means is formed of a spring material capable of deforming when the contacting pressure exerted by the hold down means on the stack exceeds a predetermined pressure.
Claim 4
Dependent Claim
31 words
The apparatus of claim 1 wherein said sheet feeding means consists of at least one feed roller being arranged to continually ride in contact with the last sheet in said stack.
Claim 5
Dependent Claim
28 words
The apparatus of claim 1 further including retaining means for supporting the leading edge of said stack in alignment during the separation and feeding of a sheet therefrom.
Claim 6
Dependent Claim
166 words
Apparatus for separating and forwarding individual sheets from a supply stack including: feed rolls being arranged to contact the top sheet in a supply stack; drive means operatively connected with said feed rolls for rotating the feed rolls in a first direction whereby the top sheet in said stack is moved rearwardly and then rotating the feed rolls in the opposite direction wherein the top sheet in said stack is moved in a forward direction; a stack holddown element mounted upon the free end of a lever arm in contact with the stack at a point rearward of said feed rolls in relation to the direction of sheet movement; and clutch means operatively associated with said feed rolls for controlling the movement of said lever arm to position said holddown element in pressure contact with said stack when the feed rolls are moved in a rearward direction and to release said pressure from said holddown means as said feed rolls are driven in a forward direction.
Claim 7
Dependent Claim
166 words
Apparatus for separating and forwarding individual sheets from a supply stack including: feed rolls being arranged to contact the top sheet in a supply stack; drive means operatively connected with said feed rolls for rotating the feed rolls in a first direction whereby the top sheet in said stack is moved rearwardly and then rotating the feed rolls in the opposite direction wherein the top sheet in said stack is moved in a forward direction; a stack holddown element mounted upon the free end of a lever arm in contact with the stack at a point rearward of said feed rolls in relation to the direction of sheet movement; and clutch means operatively associated with said feed rolls for controlling the movement of said lever arm to position said holddown element in pressure contact with said stack when the feed rolls are moved in a rearward direction and to release said pressure from said holddown means as said feed rolls are driven in a forward direction.
Claim 8
Dependent Claim
51 words
The apparatus of claim 5 wherein said feed rolls are pivotally mounted above the supply stack upon a pivot arm, said pivot arm further rotatably supporting said lever arm wherein the distance between said feed rolls and hold down element remains constant as the contents of the supply stack are depleted.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |