Patent US3779359A successfully refreshed from Google Patents.
US3779359A
Expired / Lapsed
US
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System for performing carrier return operation
Assignee: International Business Machines Corp
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Filing: 1971-10-22
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Granted: 1973-12-18
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Expires: 1991-10-22
Abstract
Abstract A system for performing a carrier return operation in a typewriter, printer, etc., having a leadscrew controlled carrier, and controlling when the carrier is to be returned dependent upon a carrier return signal generated in conjunction with combinations of generated signals indicative of rotation and nonrotation of the leadscrew, and the leadscrew rotational position. The system is structured such that the carrier will be returned and properly positioned at the left margin or starting line upon termination of escapement, and upon signals being generated indicating that the leadscrew is in its home rotational position.
Inventors
- 👤 D Morrison
- 👤 R Raesz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:20
CPC Classifications
B; B41; B41J; B41J19/00; B41J19/18; B41J19/68; B41J19/70
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
112 words
A system for performing a carrier return operation in typewriters, printers, and similar apparatuses having a leadscrew controlling a carrier, said system comprising: a first means for generating an electronic carrier return signal; a second means for generating electronic position signals corresponding to the rotational position of said leadscrew; a third means for generating electronic rotation and Notrotation signals corresponding to rotation and non-rotation of said leadscrew; and a fourth means for causing said carrier to return upon the occurrence of an electronic Not-rotation signal and an electronic position signal being an electronic home signal corresponding to the home rotational position of said leadscrew after an electronic carrier return signal is generated.
Claim 2
Independent Claim
112 words
A system for performing a carrier return operation in typewriters, printers, and similar apparatuses having a leadscrew controlling a carrier, said system comprising: a first means for generating an electronic carrier return signal; a second means for generating electronic position signals corresponding to the rotational position of said leadscrew; a third means for generating electronic rotation and Notrotation signals corresponding to rotation and non-rotation of said leadscrew; and a fourth means for causing said carrier to return upon the occurrence of an electronic Not-rotation signal and an electronic position signal being an electronic home signal corresponding to the home rotational position of said leadscrew after an electronic carrier return signal is generated.
Claim 3
Dependent Claim
26 words
A system according to claim 1 wherein said fourth means includes means for stopping rotation of said leadscrew upon the occurrence of an electronic home signal.
Claim 4
Dependent Claim
45 words
A system according to claim 2 wherein said fourth means includes means for continuing rotation of said leadscrew upon the occurrence of an electronic position signal not being an electrode home signal until the occurrence of an electronic position signal being an electronic home signal.
Claim 5
Dependent Claim
53 words
A system according to claim 2 wherein said fourth means includes means for initiating and continuing rotation of said leadscrew upon the occurrence of an electronic Not-rotation signal and and an electronic position signal not being an electronic home signal until the occurrenCe of an electronic position signal being an electronic home signal.
Claim 6
Independent Claim
203 words
A system for performing a carrier return operation in typewriters, printers, and similar apparatuses having a leadscrew controlling a carrier, said system comprising: means for generating an electronic carrier return signal; means for generating electronic position signals corresponding to the rotational position of said leadscrew; means for generating electronic rotation and Not-rotation signals corresponding to rotation and non-rotation of said leadscrew; means for generating an electronic stop signal and means for stopping rotation of said leadscrew; means for generating an electronic initiation signal and means for initiating rotation of said leadscrew; means for generating an electronic continuation signal and means for continuing rotation of said leadscrew; and means for causing said carrier to return upon the occurrence of an electronic carrier return and any of the following combinations of electronic signals: A. a Not-rotation signal and a home signal corresponding to the home rotational position of said leadscrew; B. a rotation signal, a home signal, and a stop signal; C. a rotation signal, a position signal not being a home signal, a continuation signal, a home signal, and a stop signal; D. a position signal not being a home signal, a Not-rotation signal, an initiation signal, a home signal, and a stop signal.
Claim 7
Independent Claim
203 words
A system for performing a carrier return operation in typewriters, printers, and similar apparatuses having a leadscrew controlling a carrier, said system comprising: means for generating an electronic carrier return signal; means for generating electronic position signals corresponding to the rotational position of said leadscrew; means for generating electronic rotation and Not-rotation signals corresponding to rotation and non-rotation of said leadscrew; means for generating an electronic stop signal and means for stopping rotation of said leadscrew; means for generating an electronic initiation signal and means for initiating rotation of said leadscrew; means for generating an electronic continuation signal and means for continuing rotation of said leadscrew; and means for causing said carrier to return upon the occurrence of an electronic carrier return and any of the following combinations of electronic signals: A. a Not-rotation signal and a home signal corresponding to the home rotational position of said leadscrew; B. a rotation signal, a home signal, and a stop signal; C. a rotation signal, a position signal not being a home signal, a continuation signal, a home signal, and a stop signal; D. a position signal not being a home signal, a Not-rotation signal, an initiation signal, a home signal, and a stop signal.
Claim 8
Dependent Claim
22 words
A system according to claim 5 wherein said means for initiating rotation of said leadscrew includes means for inputting a space count.
Claim 9
Dependent Claim
19 words
A system according to claim 5 wherein said combinations of electronic signals occur upon forward escapement of said carrier.
Claim 10
Dependent Claim
16 words
A system according to claim 5 further including means for determining forward escapement of said carrier.
Claim 11
Dependent Claim
30 words
A system according to claim 5 further including means for continuing carrier escapement and leadscrew rotation for characters and functions input prior to generation of an electronic carrier return signal.
Claim 12
Dependent Claim
31 words
A system according to claim 6 further including means for comparing said space count with the number of said electronic position signals for determining when said carrier is to be returned.
Claim 13
Dependent Claim
16 words
A system according to claim 8 further including means for determining reverse rotation of the leadscrew.
Claim 14
Dependent Claim
29 words
A system according to claim 5 further including means for causing said leadscrew to rotate to a home rotational position for said combinations of electronic signals (C) and (D).
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |