US4372699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet feeder for typewriters
Assignee: IBM Information Products Corp
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Filing: 1981-07-15
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Granted: 1983-02-08
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Expires: 2001-07-15
Abstract
Abstract A sheet paper feed apparatus for a typewriter having a frame supporting a platen for holding and providing at least longitudinal motion to a sheet of paper. A rectangular tray includes forward and rear paper supports for supporting a stack of paper thereon. Therebetween is a shinglar roll or wheel which supports the central portion of the paper stack is a slightly bowed configuration. The shinglar wheel is first driven in a rearward fashion to effect removal of the forward or leading edge of the bottom most sheet from the stack away from the forward support, and then the shinglar wheel rotation is reversed effecting feeding of the sheet of paper away from the bottom of the stack and below the forward paper support into paper feed rolls and ultimately onto the platen.
Inventors
- 👤 Paul A. Quinn, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:37
CPC Classifications
B; B41; B41J; B41J13/00; B41J13/10; B41J13/103
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
372 words
A sheet paper feed apparatus for a typewriter for feeding individual sheets of paper to the platen of the typewriter, said typewriter including platen drive means for feeding paper around the platen and into a position for typing thereon; said apparatus comprising: a rectangular tray including a rear paper support portion and a spaced apart forward paper support portion for supporting thereon the opposite ends of a stack of paper; a shingler wheel intermediate said support portions, and projecting above a plane lying through said support portions to engage the lowermost sheet of said stack of paper and to support the center of the stack of paper to form a concave bow therein so that only the opposite ends of said stack of paper are supported by said support portions; a motor drive means connected to said shingler wheel to effect reversable rotation thereto, said motor responsive to a first command for effecting rotation of said shingler wheel in a first direction to slide the lowermost sheet of paper of said stack of paper towards said rear support portion until said forward support portion no longer supports said lowermost sheet; first sensing means mounted on the tray for sensing separation of said sheet of paper from said forward support portion; paper sheet camming means beneath said forward support portion to aid in downward deflection of said lowermost sheet, and circuit means responsive to the sensing means sensing such separation for effecting motor drive means direction reversal and thus reversal of the direction of rotation of said shingler wheel to thereby urge said lowermost sheet in a second direction under said forward support portion toward said platen; a first sheet drive roll adjacent said camming means for grasping said lowermost sheet and means for effecting rotation of said first sheet drive roll for directing said lowermost sheet of paper towards the platen of said typewriter, and a second sheet drive roll superimposed of said first sheet drive roll, and means for effecting rotation of said second sheet drive roll in synchronism with rotation of said first sheet drive roll and said platen to advance sheets of paper received from the platen of the typewriter to a position superimposed of said stack of paper.
Claim 2
Dependent Claim
372 words
A sheet paper feed apparatus for a typewriter for feeding individual sheets of paper to the platen of the typewriter, said typewriter including platen drive means for feeding paper around the platen and into a position for typing thereon; said apparatus comprising: a rectangular tray including a rear paper support portion and a spaced apart forward paper support portion for supporting thereon the opposite ends of a stack of paper; a shingler wheel intermediate said support portions, and projecting above a plane lying through said support portions to engage the lowermost sheet of said stack of paper and to support the center of the stack of paper to form a concave bow therein so that only the opposite ends of said stack of paper are supported by said support portions; a motor drive means connected to said shingler wheel to effect reversable rotation thereto, said motor responsive to a first command for effecting rotation of said shingler wheel in a first direction to slide the lowermost sheet of paper of said stack of paper towards said rear support portion until said forward support portion no longer supports said lowermost sheet; first sensing means mounted on the tray for sensing separation of said sheet of paper from said forward support portion; paper sheet camming means beneath said forward support portion to aid in downward deflection of said lowermost sheet, and circuit means responsive to the sensing means sensing such separation for effecting motor drive means direction reversal and thus reversal of the direction of rotation of said shingler wheel to thereby urge said lowermost sheet in a second direction under said forward support portion toward said platen; a first sheet drive roll adjacent said camming means for grasping said lowermost sheet and means for effecting rotation of said first sheet drive roll for directing said lowermost sheet of paper towards the platen of said typewriter, and a second sheet drive roll superimposed of said first sheet drive roll, and means for effecting rotation of said second sheet drive roll in synchronism with rotation of said first sheet drive roll and said platen to advance sheets of paper received from the platen of the typewriter to a position superimposed of said stack of paper.
Claim 3
Dependent Claim
54 words
A sheet paper feed apparatus in accordance with claim 1 including second sensor means adjacent said first sheet drive roll to indicate the presence of said lowermost sheet at said first sheet drive roll, and second circuit means responsive to an output from said second sensor to stop rotation of said motor drive means.
Claim 4
Dependent Claim
88 words
A sheet paper feed apparatus in accordance with claim 1 or 2 wherein said forward support portion comprises a pair of laterally spaced apart fingers projecting inwardly of said tray, said paper sheet camming means underlying said fingers and including an upwardly directed and sloped surface to effect said downward deflection of the leading edge of said lowermost sheet of said stack upon reversal of the shingler wheel and thus movement of the lowermost sheet of paper fed in the second direction towards said first sheet drive roll.
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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) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |