US3915281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Platen and paper roll support and drive mechanism
Assignee: BARCLAYSAMERICAN/BUSINESS CREDIT INC 530 NORTH WATER STMILWAUKEE WS A CORP OF CT
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Filing: 1973-11-08
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Granted: 1975-10-28
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Expires: 1993-11-08
Abstract
Abstract Paper feed mechanism for printer for electronic calculator comprises simplified paper roll support having readily removable shaft with longitudinally spaced peripheral grooves and sleeve slidable and rotatable on shaft to engage flexible inturned flange at one of its ends with a selected groove and outwardly extending flange at other end of sleeve thereby engageable with edge of paper roll to guide and impose drag against unwinding of different width rolls, and paper feed including spring-backed pressure roller, hollow cylindrical platen with end caps pressfitted therein having central hubs press-fitted on platen shaft, one with internal ratchet gear, and external platen gear rotatable on platen shaft as part of platen drive train including spring-loaded drive coupling cooperating with internal ratchet gear, intermediate gear and cyclically rotatable worm gear which, together with a detent, prevent backlash and effect minimum acceleration without overspin, all providing a rigidly located printing surface with manual twirling of platen available to feed paper by virtue of drive coupling acting as break-away clutch.
Inventors
- 👤 James E Blomquist
- 👤 Robert H Wilczewski
- 👤 Rafael A Castellanos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:56
CPC Classifications
B; B41; B41J; B41J11/00; B41J11/02; B41J11/04; B65; B65H; B65H16/00; B65H16/02; B65H16/06; B65H2301/00; B65H2301/40; B65H2301/41; B65H2301/413; B65H2301/4134; B65H2301/41342; B65H2511/00; B65H2511/10; B65H2511/12; B65H2801/00; B65H2801/03; B65H2801/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
279 words
Paper support and feed mechanism for a business machine, comprising a rotatable platen having a supporting shaft, platen positioning means for rigidly and accurately locating said shaft to accurately present said platen in printing position and releasable manually to enable swinging of said platen away from printing position, drive means for cyclically rotating said platen incrementally without overspin or backlash while said platen is either in or away from printing position, and paper roll support means for rotatably mounting a roll of paper axially to supply paper to said platen and for guiding said roll and imposing an axially directed drag against said paper roll to prevent free unwinding of the paper from said roll, wherein said platen positioning means comprises arms pivotally mounted at their lower ends and respectively rotatably supporting end portions of said platen shaft at their upper ends, and a unitary platen positioner having pivotally mounteD legs for cammingly engaging said arms to move said platen into said printing position, a base having means for pivotally supporting said legs and upstanding posts limiting movement of said arms by said legs of said platen positioner, a frame member secured to said base, and rearwardly and upwardly extending trunnion arms supported at their lower ends by said frame member and comprising part of said paper roll support means, wherein said paper roll support means comprises a horizontal spindle and said trunnion arms are formed at their upper ends to frictionally engage and removably retain the end of said spindle, and wherein said paper roll support means comprises a sleeve slidable and rotatable on said spindle with outwardly extending flange means engaging an edge of said paper roll.
Claim 2
Dependent Claim
279 words
Paper support and feed mechanism for a business machine, comprising a rotatable platen having a supporting shaft, platen positioning means for rigidly and accurately locating said shaft to accurately present said platen in printing position and releasable manually to enable swinging of said platen away from printing position, drive means for cyclically rotating said platen incrementally without overspin or backlash while said platen is either in or away from printing position, and paper roll support means for rotatably mounting a roll of paper axially to supply paper to said platen and for guiding said roll and imposing an axially directed drag against said paper roll to prevent free unwinding of the paper from said roll, wherein said platen positioning means comprises arms pivotally mounted at their lower ends and respectively rotatably supporting end portions of said platen shaft at their upper ends, and a unitary platen positioner having pivotally mounteD legs for cammingly engaging said arms to move said platen into said printing position, a base having means for pivotally supporting said legs and upstanding posts limiting movement of said arms by said legs of said platen positioner, a frame member secured to said base, and rearwardly and upwardly extending trunnion arms supported at their lower ends by said frame member and comprising part of said paper roll support means, wherein said paper roll support means comprises a horizontal spindle and said trunnion arms are formed at their upper ends to frictionally engage and removably retain the end of said spindle, and wherein said paper roll support means comprises a sleeve slidable and rotatable on said spindle with outwardly extending flange means engaging an edge of said paper roll.
Claim 3
Dependent Claim
59 words
A paper support and feed mechanism according to claim 1, wherein said outwardly extending flange means comprises a flange having arcuately disposed spring fingers formed integrally and connected at one end therewith, each said finger having its other end free for movement axially of said spindle and an axially extending protuberance thereon engaging said edge of said paper roll.
Claim 4
Dependent Claim
44 words
A paper support and feed mechanism according to claim 1, wherein said spindle is provided with longitudinally spaced peripheral grooves, and said sleeve comprises flexible inturned flange means formed integrally therewith and engageable in a selected said groove to accommodate rolls of different widths.
Claim 5
Dependent Claim
169 words
Paper support and feed mechanism for a business machine, comprising a rotatable platen having a supporting shaft, platen positioning means for rigidly and accurately locating said shaft to accurately present said platen in printing position and releasable manually to enable swinging of said platen away from printing position, drive means for cyclically rotating said platen incrementally without overspin or backlash while said platen is either in or away from printing position, and paper roll support means for rotatably mounting a roll of paper axially to supply paper to said platen and for guiding said roll and imposing an axially directed drag against said paper roll to prevent free unwinding of the paper from said roll, a pressure roller having a shaft, pressure roller supporting means for loosely supporting said roller for rotation and radial movement relative to said platen, and spring means cooperating with said pressure roller shaft in response to operation of said platen positioning means to resiliently maintain said pressure roller in peripheral contact with said platen.
Claim 6
Dependent Claim
169 words
Paper support and feed mechanism for a business machine, comprising a rotatable platen having a supporting shaft, platen positioning means for rigidly and accurately locating said shaft to accurately present said platen in printing position and releasable manually to enable swinging of said platen away from printing position, drive means for cyclically rotating said platen incrementally without overspin or backlash while said platen is either in or away from printing position, and paper roll support means for rotatably mounting a roll of paper axially to supply paper to said platen and for guiding said roll and imposing an axially directed drag against said paper roll to prevent free unwinding of the paper from said roll, a pressure roller having a shaft, pressure roller supporting means for loosely supporting said roller for rotation and radial movement relative to said platen, and spring means cooperating with said pressure roller shaft in response to operation of said platen positioning means to resiliently maintain said pressure roller in peripheral contact with said platen.
Claim 7
Dependent Claim
50 words
Paper support and feed mechanism according to claim 4, wherein said pressure roller supporting means comprises a rigid curved paper guide, and means engageable with said platen supporting shaft and said platen positioning means for maintaining said paper guide in closely spaced relation to said platen in all positions thereof.
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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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |