US3882990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error correction system for typewriters or printing devices
Assignee: Messa Maquinas De Escrever S A
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Filing: 1973-02-08
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Granted: 1975-05-13
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Expires: 1993-02-08
Abstract
Abstract A novel error correction system applicable to any type of typewriter or printing apparatus having a ribbon with an appropriate strip for obliterating printed letters, comprises a correction key which is simultaneously associated (1) with the ribbon-position selection mechanism by means of a lever that, through the action of a spring, pulls the ribbon vibrator link to the correction position; (2) with the escapement mechanism by means of a link which causes the escapement impeller to move, thereby removing it from the normal operating position; and (3) with the backspacing system of the typewriter by means of a surface of the reverse lever which, by acting on a link screw, operates the backspace dog and therefore the typewriter carriage backspaces one space. When the correction system is engaged, however, the escapement impeller remains free to be operated if desired by a space bar.
Inventors
- 👤 Jesus F Genesio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:23
CPC Classifications
B; B41; B41J; B41J29/00; B41J29/26; B41J29/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
263 words
In a typewriter for use with ribbons providing a printing field and a print-obliterating field, said typewriter including a printing means comprising a plurality of character keys for printing on paper: means to support the paper; means for normal advancement of said paper support means during the printing operation including an escapement impeller and a space arch operatively connected to said escapement impeller to effect advancement of said paper support means when any of said character keys is depressed; advancing means for advancing said paper support means independent of said space arch, said advancing means including a space bar operatively connected to said escapement impeller for advancing said paper support means independent of said space arch; means for positioning a ribbon between said printing means and the paper on said paper support means; means to select the ribbon field; and means to backspace said paper support means, the improvement comprising: correction means comprising means to simultaneously (1) operate said backspace means, (2) operate said means to select the ribbon field to shift to a print-obliterating field and (3) bypass advancement of said papeR support means by preventing operation of said escapement impeller by said space arch and without interference with said means for advancing said paper support means independent of said space arch, so that said paper support means can be moved, by said means for advancing said paper support means independent of said space arch, after engagement of said correction means, while operation of said space arch does not effect operation of said means for normal advancement of said paper support means.
Claim 2
Dependent Claim
263 words
In a typewriter for use with ribbons providing a printing field and a print-obliterating field, said typewriter including a printing means comprising a plurality of character keys for printing on paper: means to support the paper; means for normal advancement of said paper support means during the printing operation including an escapement impeller and a space arch operatively connected to said escapement impeller to effect advancement of said paper support means when any of said character keys is depressed; advancing means for advancing said paper support means independent of said space arch, said advancing means including a space bar operatively connected to said escapement impeller for advancing said paper support means independent of said space arch; means for positioning a ribbon between said printing means and the paper on said paper support means; means to select the ribbon field; and means to backspace said paper support means, the improvement comprising: correction means comprising means to simultaneously (1) operate said backspace means, (2) operate said means to select the ribbon field to shift to a print-obliterating field and (3) bypass advancement of said papeR support means by preventing operation of said escapement impeller by said space arch and without interference with said means for advancing said paper support means independent of said space arch, so that said paper support means can be moved, by said means for advancing said paper support means independent of said space arch, after engagement of said correction means, while operation of said space arch does not effect operation of said means for normal advancement of said paper support means.
Claim 3
Dependent Claim
150 words
A device in accordance with claim 1, wherein said correction means comprises a correction key having three positions including a first rest position, a second position and a third position, said correction means effecting, (1) said operation of said backspace means, (2) said operation of said means to select the ribbon field, and (3) said bypassing of advancement of said paper support means by prevention of advancement of said escapement impeller by said space arch, when said correction key is in said third position; and when said correction key is in said second position said correction means effecting only (1) said operation of said means to select the ribbon field, and (2) said bypassing of advancement of said paper support means by prevention of advancement of said escapement impeller by said space arch; said correction means further comprising means to maintain said correction key in said third position during print-obliterating.
Claim 4
Dependent Claim
39 words
A device in accordance with claim 2 further comprising release means to disengage said correction means whereby said correction key returns from said third position to said first position without effecting print-obliterating, said release means including a release key.
Claim 5
Dependent Claim
37 words
A device in accordance with claim 2 wherein said correction means further comprises means to return said correction key from said third position to said first position upon the striking of a character key to effect print-obliterating.
Claim 6
Dependent Claim
162 words
A device in accordance with claim 1, wherein said correction means comprises: a correction key and a generally horizontally disposed reverse lever controlled by said correction key; ribbon shifting means controlled by said reverse lever; means associated with said reverse lever to operate said backspace means upon movement of said reverse lever; and bypass means controlled by said reverse lever to prevent operation of said escapement impeller by said space arch, thereby preventing advancement of said paper support means during striking one of said plurality of character keys to effect print-obliterating; said bypass means comprising bypass linking means extending from said reverse lever to said escapement impeller to move said escapement impeller laterally upon movement of said reverse lever so that the striking of one of said plurality of character keys will not effect longitudinal movement of said escapement impeller to thereby advance said paper support means; spring means urging said escapement impeller in the lateral direction opposite from said linking means.
Claim 7
Dependent Claim
202 words
A device in accordance with claim 5, wherein said correction means further comprises positioning and return means to initially position said reverse lever during print-obliterating and to then return said correction key to said first position after print-obliterating, said positioning and return means comprising: a generally vertically disposed positioning lever, spring means biasing said positioning lever into interference with said reverse lever, positioning lever linking means extending from said positioning lever toward said correction key, a universal bar means connected to the correction key end of said positioning lever linking means; said universal bar means being so positioned that when the correction key is depressed to the third position thereof thereby causing positioning of said reverse lever by interference with said positioning lever, and thereafter said universal bar means is struck by depressing one of said plurality of character keys of said printing means, said positioning lever linking means is pulled by said universal bar means and said positioning lever is thereby pulled against the action of said spring biasing means , thereby permitting, by removing the interference of said positioning lever with said reverse lever, rotation of said reverse lever and return of said correction key to the first position thereof.
Claim 8
Dependent Claim
33 words
A device in accordance with claim 5 wherein said bypass linking means comprises an elongated link extending from said reverse lever and a spring extending from said elongated link to said escapement impeller.
Claim 9
Dependent Claim
60 words
A device in accordance with claim 5 wherein said ribbon shifting means comprises a generally vertically disposed ribbon shifting lever connected to said reverse lever by a connecting spring, and a ribbon vibrator link controlled by said ribbon shifting lever; and wherein said means to operate said backspace means comprises a connection between said reverse lever and said backspace means.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |