US3830976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing telegraph mechanism
Assignee: International Standard Electric Corp
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Filing: 1973-06-01
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Granted: 1974-08-20
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Expires: 1993-06-01
Abstract
Abstract The styli of a mosaic printhead are each attached to switchable conductive loops positioned in a gap between a pole piece and a rotatable magnetic member. The rotatable member is rotated continuously and periodically induces currents in closed, conductive short circuited loops thus causing them and their associated styli to move.
Inventors
- 👤 T Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:54
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/27; H; H04; H04L; H04L21/00; H04L21/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
266 words
A printer comprising: a base; a carriage means mounted on said base; platen means mounted on said base in a manner to support a recording medium adjacent said carriage means; an elongated axially movable stylus having first and second ends; a conductive loop fixed relative to said second stylus end; means to produce relative movement between a recording medium and said first stylus end in a direction approximately normal thereto; means mounted on said carriage means to guide said axial movement of said stylus; driver means to produce magnetic flux in a location linking said conductive loop, said driver means causing the amount of said linking flux to change abruptly; and a selectively operable switch connected in series with said conductive loop to short circuit the same when the switch is closed, said abrupt change in flux leaving said conductive loop axially motionless when said switch is open, said abrupt change in flux causing a force to be applied to said conductive loop when said switch is closed, said force being transmitted to said stylus to move the same axially to cause said first end thereof to strike a recording medium when such is supported in position therefor by said platen means as aforesaid, and to make a detectable recording mark on said recording medium where said stylus first end strikes said record medium, closure of said switch permitting a current to be induced in said conductive loop, which induced current produces its own magnetic field that reacts with that produced by said driver means and causes said force to be applied to said conductive loop.
Claim 2
Dependent Claim
266 words
A printer comprising: a base; a carriage means mounted on said base; platen means mounted on said base in a manner to support a recording medium adjacent said carriage means; an elongated axially movable stylus having first and second ends; a conductive loop fixed relative to said second stylus end; means to produce relative movement between a recording medium and said first stylus end in a direction approximately normal thereto; means mounted on said carriage means to guide said axial movement of said stylus; driver means to produce magnetic flux in a location linking said conductive loop, said driver means causing the amount of said linking flux to change abruptly; and a selectively operable switch connected in series with said conductive loop to short circuit the same when the switch is closed, said abrupt change in flux leaving said conductive loop axially motionless when said switch is open, said abrupt change in flux causing a force to be applied to said conductive loop when said switch is closed, said force being transmitted to said stylus to move the same axially to cause said first end thereof to strike a recording medium when such is supported in position therefor by said platen means as aforesaid, and to make a detectable recording mark on said recording medium where said stylus first end strikes said record medium, closure of said switch permitting a current to be induced in said conductive loop, which induced current produces its own magnetic field that reacts with that produced by said driver means and causes said force to be applied to said conductive loop.
Claim 3
Dependent Claim
24 words
The invention as defined in claim 1, wherein: means are provided to prevent said conductive loop from rotating about the axis of said stylus.
Claim 4
Dependent Claim
32 words
The invention as defined in claim 2, wherein: a spring is provided, said spring being mounted on said carriage means to urge said stylus in a direction away from said platen means.
Claim 5
Dependent Claim
96 words
The invention as defined in claim 3, wherein: said driver means includes a magnetic circuit having a fixed magnetic yoke including an elongated, non-circular magnetic shaft spaced a short distance therefrom, a maximum flux being established in said magnetic circuit when said shaft is located in one angular position, a minimum flux being established in said magnetic circuit when said shaft is located in another angular position, means to rotate said shaft, means to establish a magnetomotive force in said magnetic circuit, said conductive loop being located between one end of said yoke and said shaft.
Claim 6
Dependent Claim
96 words
The invention as defined in claim 2, wherein: said driver means includes a magnetic circuit having a fixed magnetic yoke including an elongated, non-circular magnetic shaft spaced a short distance therefrom, a maximum flux being established in said magnetic circuit when said shaft is located in one angular position, a minimum flux being established in said magnetic circuit when said shaft is located in another angular position, means to rotate said shaft, means to establish a magnetomotive force in said magnetic circuit, said conductive loop being located between one end of said yoke and said shaft.
Claim 7
Dependent Claim
31 words
The invention as defined in claim 1, wherein: spring is provided, said spring being mounted on said carriage means to urge said stylus in a direction away from said platen means.
Claim 8
Dependent Claim
96 words
The invention as defined in claim 6, wherein: said driver means includes a magnetic circuit having a fixed magnetic yoke including an elongated, non-circular magnetic shaft spaced a short distance therefrom, a maximum flux being established in said magnetic circuit when said shaft is located in one angular position, a minimum flux being established in said magnetic circuit when said shaft is located in another angular position, means to rotate said shaft, means to establish a magnetomotive force in said magnetic circuit, said conductive loop being located between one end of said yoke and said shaft.
Claim 9
Dependent Claim
96 words
The invention as defined in claim 1, wherein: said driver means includes a magnetic circuit having a fixed magnetic yoke including an elongated, non-circular magnetic shaft spaced a short distance therefrom, a maximum flux being established in said magnetic circuit when said shaft is located in one angular position, a minimum flux being established in said magnetic circuit when said shaft is located in another angular position, means to rotate said shaft, means to establish A magnetomotive force in said magnetic circuit, said conductive loop being located between one end of said yoke and said shaft.
Claim 10
Dependent Claim
88 words
An electromagnetic actuator comprising: a base; a movable conductive loop for connection to a member to be mechanically actuated by movement thereof; means to guide movement of said conductive loop on said base in the plane of said conductive loop; connecting means selectively operable to open and to short circuit said conductive loop; and driver means to produce magnetic flux in a location linking said conductive loop, said driver means causing the amount of said linking flux to change abruptly for inducing a current in said conductive loop.
Claim 11
Dependent Claim
88 words
An electromagnetic actuator comprising: a base; a movable conductive loop for connection to a member to be mechanically actuated by movement thereof; means to guide movement of said conductive loop on said base in the plane of said conductive loop; connecting means selectively operable to open and to short circuit said conductive loop; and driver means to produce magnetic flux in a location linking said conductive loop, said driver means causing the amount of said linking flux to change abruptly for inducing a current in said conductive loop.
Claim 12
Dependent Claim
130 words
The invention as defined in claim 9, wherein: said connecting means includes a selectively operable switch which can be opened or closed, said switch being connected in series with said conductive loop to short circuit the same when the switch is closed, said abrupt change in flux leaving said conductive loop motionless when said switch is open, said abrupt change in flux causing a force to be applied to said conductive loop when said switch is closed, said force being transmitted to said member to move the same, closure of said switch permitting a current to be induced in said conductive loop which induced current produces its own magnetic field that reacts with that produced by said driver means and causes said force to be applied to said conductive loop.
References Cited (Backward Citations)
US3477365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |