US4072101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear actuator printer carriage
Assignee: International Business Machines Corp
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Filing: 1976-05-27
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Granted: 1978-02-07
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Expires: 1996-05-27
Abstract
Abstract A linear actuator for positioning a print assembly parallel to a line on which characters are being printed is disclosed. The linear actuator includes a three-sided open structure magnetic circuit fabricated from rectangular pieces of slab magnets positioned about a central return path. The print assembly is seated on the open side of said linear actuator. Cooling for the actuator is achieved by pulling air in a direction perpendicular to the direction of motion of said print assembly.
Inventors
- 👤 Joe La Garcia
- 👤 Brandt M. Griffing
- 👤 Paul Y. Hu
- 👤 Richard G. Millington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:34
CPC Classifications
B; B41; B41J; B41J19/00; B41J19/18; B41J19/20; B41J19/30; B41J19/305
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
Linear actuator comprising in combination: a single rectangular magnetic flux return path; said magnetic flux return path being stationary and centrally located; a magnetic structure being positioned in spaced relation with only three sides of said return path; said magnetic structure having only three pieces of rectangular slab magnetts being arranged so that each piece of the slab magnets faces one of the sides of said magnetic flux return path to supply flux lines perpendicular to said return path; an air gap operably positioned between the magnetic flux return path and the slab magnets; a coil bobbin means operably positioned to move within said air gap; and means operable for supplying electrical energy to said coil bobbin.
Claim 2
Dependent Claim
117 words
Linear actuator comprising in combination: a single rectangular magnetic flux return path; said magnetic flux return path being stationary and centrally located; a magnetic structure being positioned in spaced relation with only three sides of said return path; said magnetic structure having only three pieces of rectangular slab magnetts being arranged so that each piece of the slab magnets faces one of the sides of said magnetic flux return path to supply flux lines perpendicular to said return path; an air gap operably positioned between the magnetic flux return path and the slab magnets; a coil bobbin means operably positioned to move within said air gap; and means operable for supplying electrical energy to said coil bobbin.
Claim 3
Dependent Claim
19 words
The device as claimed in claim 1 further including a carriage assembly operably connected to the coil bobbin means.
Claim 4
Dependent Claim
17 words
The device as claimed in claim 2 further including print means operably connected to said carriage assembly.
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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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |