US3836880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matrix printer drive element
Assignee: TELE SPEED COMMUNICATIONS Inc
•
Filing: 1973-10-25
•
Granted: 1974-09-17
•
Expires: 1993-10-25
Abstract
Abstract An improved electromagnet design for use as a dot-matrix printer drive element. A solid winding core is provided with integral pole pieces at both ends. A leaf spring is secured to a first pole piece and extends generally parallel to the axis of the core. A magnetic field shunt piece is secured at the free end of the spring on the side facing the core. A printing wire shoe is also secured to the leaf spring at its free end, and extends away from it. The printing wire is affixed in the shoe and extends back across the axis of the core. In the un-energized condition, there is a gap between the shunt and the second pole piece that is roughly one-half of the desired stroke of the printing wire. The electromagnet is of very low mass, but operates at high speed with a long printing stroke having maximum force at the moment of impact of the printing wire on the printing medium. This design allows a plurality of such drive elements to be radially mounted in a circle with all of the respective printing wires close to the center of that circle. The center of the circle will also coincide with the centerline axis of the printed characters.
Inventors
- 👤 A Matschke
- 👤 J Horowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:59
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/14; B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/27; B41J2/275; B41J9/00; B41J9/26; B41J9/38
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
80 words
An electromagnet for actuating a drive element comprising: magnetic means including two opposed pole sections and a core extending therebetween; a coil surrounding said core between said pole sections; leaf spring means secured to one said pole section and extending to the other said pole section; magnetic field shunt means secured to said spring means and extending between but normally spaced from said pole sections; and drive element means also secured to said spring means at the free end thereof.
Claim 2
Dependent Claim
80 words
An electromagnet for actuating a drive element comprising: magnetic means including two opposed pole sections and a core extending therebetween; a coil surrounding said core between said pole sections; leaf spring means secured to one said pole section and extending to the other said pole section; magnetic field shunt means secured to said spring means and extending between but normally spaced from said pole sections; and drive element means also secured to said spring means at the free end thereof.
Claim 3
Dependent Claim
45 words
The electromagnet as claimed in claim 1, wherein said drive element means comprises: shoe means secured to said spring means and extending therebeyond; and print wire means secured in the distal end of said shoe means and extending back across the axis of said core.
Claim 4
Dependent Claim
16 words
The electromagnet as claimed in claim 1, wherein said magnetic means comprises a single, integral part.
Claim 5
Dependent Claim
31 words
The electromagnet as claimed in claim 1, wherein said field shunt means and said drive element means are secured on opposite sides of said spring means at the free end thereof.
Claim 6
Dependent Claim
22 words
The electromagnet as claimed in claim 1, wherein said field shunt means is spaced from said spring means except where secured thereto.
Claim 7
Dependent Claim
121 words
A drive element for a dot-matrix printer comprising: magnetic means including two opposed pole sections and a core extending therebetween; a coil surrounding said core between said pole sections; leaf spring means secured to one said pole section and extending to the other said pole section; magnetic field shunt means secured to said spring means and extending between but normally spaced from said pole sections; said shunt means and the other said pole section defining a gap therebetween when said coil is not energized; shoe means secured to said spring means at the free end thereof and extending therebeyond; and print wire means secured in the distal end of said shoe means and extending back across the axis of said core.
Claim 8
Dependent Claim
121 words
A drive element for a dot-matrix printer comprising: magnetic means including two opposed pole sections and a core extending therebetween; a coil surrounding said core between said pole sections; leaf spring means secured to one said pole section and extending to the other said pole section; magnetic field shunt means secured to said spring means and extending between but normally spaced from said pole sections; said shunt means and the other said pole section defining a gap therebetween when said coil is not energized; shoe means secured to said spring means at the free end thereof and extending therebeyond; and print wire means secured in the distal end of said shoe means and extending back across the axis of said core.
Claim 9
Dependent Claim
17 words
The drive element as claimed in claim 6, wherein said magnetic means comprises a single, integral part.
Claim 10
Dependent Claim
31 words
The drive element as claimed in claim 6, wherein said field shunt means and said shoe means are secured on opposite sides of said spring means at the free end thereof.
Claim 11
Dependent Claim
23 words
The drive element as claimed in claim 6, wherein said field shunt means is spaced from said spring means except where secured thereto.
Claim 12
Dependent Claim
33 words
The drive element as claimed in claim 8, wherein said one pole section includes a recess adjacent the secured end of said spring, said recess accomodating the free end of said shunt means.
Claim 13
Dependent Claim
30 words
The drive element as claimed in claim 6, and additionally comprising a mounting bracket on said one pole section for attachment of said spring means and mounting said drive element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |