US4064985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selectable dual ratchet feed for a printer platen
Assignee: International Business Machines Corp
•
Filing: 1976-06-01
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Granted: 1977-12-27
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Expires: 1996-06-01
Abstract
Abstract A line feed ratchet arrangement is disclosed which allows selectability between two different line feeds such as the 5 1/3 lines per inch and six lines per inch and utilizes a drive pawl arrangement having two pawls driven identically. The drive ratchets are selectively engaged by coaxial shifting of a drive member in response to operator movement of a selector knob or similar control.
Inventors
- 👤 William Harold Castle
- 👤 William Ray Crowe
- 👤 James Lester Herriford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:15
CPC Classifications
B; B41; B41J; B41J19/00; B41J19/76; B41J19/78; B41J19/96; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A line feed control for a printer platen comprising: a rotatable and axially moveable sleeve; a pair of dissimilar pitch ratchet wheels freely rotatably mounted on said sleeve, said sleeve shiftable axially with respect to said ratchet wheels; means to separate said ratchet wheels by a fixed distance; engaging means fixedly attached to said sleeve and shiftable therewith for selectively drivingly engaging said sleeve to one of said ratchet wheels.
Claim 2
Dependent Claim
70 words
A line feed control for a printer platen comprising: a rotatable and axially moveable sleeve; a pair of dissimilar pitch ratchet wheels freely rotatably mounted on said sleeve, said sleeve shiftable axially with respect to said ratchet wheels; means to separate said ratchet wheels by a fixed distance; engaging means fixedly attached to said sleeve and shiftable therewith for selectively drivingly engaging said sleeve to one of said ratchet wheels.
Claim 3
Dependent Claim
86 words
A selectable line feed mechanism for a printer platen comprising: a pair of ratchet wheels of differing pitch each mounted for rotation independent of the other; a pair of pawl means to drive said ratchet wheels simultaneously; means to selectively drivingly connect one of said ratchet wheels with said platen, said connection means comprising a frustroconical drive surface selectably engageable with a mating surface of one of said ratchet wheels and a force transmission means driveable by said connection means and drivingly connected with said platen.
Claim 4
Dependent Claim
86 words
A selectable line feed mechanism for a printer platen comprising: a pair of ratchet wheels of differing pitch each mounted for rotation independent of the other; a pair of pawl means to drive said ratchet wheels simultaneously; means to selectively drivingly connect one of said ratchet wheels with said platen, said connection means comprising a frustroconical drive surface selectably engageable with a mating surface of one of said ratchet wheels and a force transmission means driveable by said connection means and drivingly connected with said platen.
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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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |