Patent US3752069A successfully refreshed from Google Patents.
US3752069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back printer print line visibility control
Assignee: International Business Machines Corp
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Filing: 1971-07-01
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Granted: 1973-08-14
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Expires: 1991-07-01
Abstract
Abstract In a back printer print hammers impact the document against type characters formed on upwardly projecting fingers of a steel band. The fingers are backed by a platen which is removable from the print position to permit inspection of the printed information through spaces between the fingers as the band moves along the print line.
Inventors
- 👤 D Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:34
CPC Classifications
B; B41; B41J; B41J1/00; B41J1/20; B41J29/00; B41J29/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
In a printer, a type carrier comprising an endless band mounted on spaced apart pulleys and having type characters on upwardly projecting fingers which have spaces therebetween and are movable along a print line on one side of a document on which a printing operation is to be performed, means for rotating one of said pulleys to move said carrier along said print line, print hammer means on the other side of said document selectively operable to impact said document against said type characters for printing characters thereon, and a movable platen positioned on the other side of said type carrier from said document and extending along the print line to provide a backing for said fingers, said platen being normally aligned in an operating position behind said characters on said fingers and blocking said spaces between said fingers, and having operating means for moving said platen away from said print line and out of blocking relation with with said spaces so that characters printed on said document can be observed through the spaces between said fingers.
Claim 2
Dependent Claim
177 words
In a printer, a type carrier comprising an endless band mounted on spaced apart pulleys and having type characters on upwardly projecting fingers which have spaces therebetween and are movable along a print line on one side of a document on which a printing operation is to be performed, means for rotating one of said pulleys to move said carrier along said print line, print hammer means on the other side of said document selectively operable to impact said document against said type characters for printing characters thereon, and a movable platen positioned on the other side of said type carrier from said document and extending along the print line to provide a backing for said fingers, said platen being normally aligned in an operating position behind said characters on said fingers and blocking said spaces between said fingers, and having operating means for moving said platen away from said print line and out of blocking relation with with said spaces so that characters printed on said document can be observed through the spaces between said fingers.
Claim 3
Dependent Claim
18 words
The invention as defined in claim 1 characterized by said type carrier comprising a flexible endless metal band.
Claim 4
Dependent Claim
22 words
The invention as defined in claim 2 characterized by the type characters being spaced apart with at least one character space between.
Claim 5
Dependent Claim
28 words
The invention as defined in claim 3 characterized by said movable platen being pivotally supported by a substantially horizontal pivot shaft adjacent the side away from said fingers.
Claim 6
Dependent Claim
31 words
The invention as defined in claim 1 characterized by stop means positioned to engage said platen in the operating position and spring means normally biasing said platen against said stop means.
Claim 7
Dependent Claim
37 words
The invention as defined in claim 5 characterized by said operating means comprising solenoid means having an armature connected to said platen operable to retract it from its operating position against the force of said spring means.
Claim 8
Dependent Claim
59 words
The invention as defined in claim 6 characterized by one or more operating keys so connected as to be operable to selectively energize different ones of said hammer means for printing, and circuit means including switch means connected in circuit with said solenoid means actuated by said operating keys to effect energization of said solenoid means between printing operations.
Claim 9
Dependent Claim
43 words
The invention as defined in claim 7 characterized by said circuit means including delay means controlled by said operating keys connected in circuit relation with said switch means to delay energization of said solenoid means for a predetermined interval after a printing operation.
Claim 10
Dependent Claim
52 words
The invention as defined in claim 8 characterized by said delay means including a resettable single shot and an inventor so connected in circuit relation with said operating keys and said switch means that repeated operations of said operating keys continue to extend said predetermined interval from the last operating key operation.
Claim 11
Dependent Claim
79 words
The invention as defined in claim 8 characterized by said circuit means including a first latch so connected as to be reset by said operating key and set by said delay means, and a second latch so connected to said first latch as to be set when said first latch is set and so connected by delay means as to be reset a predetermined time after said first latch is set to effect energization of said print hammer means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |