Patent US4393771A successfully refreshed from Google Patents.
US4393771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing head for a printer
Assignee: YE Data Inc
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Filing: 1981-11-24
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Granted: 1983-07-19
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Expires: 2001-11-24
Abstract
Abstract A permanent magnet type printing head for an impact dot printer wherein a plate spring hammer has a hammer tip provided on one side thereof, and an attracting magnetic pole provided with a releasing electromagnetic coil arranged on the side opposite said hammer, wherein an armature is provided on the upper surface of the plate spring hammer instead of providing same on the same side of a magnetic pole, and wherein an arm of a yoke constituting a main magnetic path is provided on the plate spring hammer, and the magnetic pole is positioned between the hammer tip and the armature.
Inventors
- 👤 Juichi Tatsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:09
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/27; B41J2/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
92 words
In permanent magnet type printing head for an impact dot printer wherein a plate spring hammer has a hammer tip provided on one side thereof, and an attracting magnetic pole provided with a releasing electromagnetic coil arranged on another side opposite said hammer, the improvement comprising an armature disposed on the side where said hammer tip of said plate spring hammer is provided, and a yoke formed with a through hole or notch within which said armature is movable, said attracting magnetic pole being arranged between said hammer tip and said armature.
Claim 2
Dependent Claim
92 words
In permanent magnet type printing head for an impact dot printer wherein a plate spring hammer has a hammer tip provided on one side thereof, and an attracting magnetic pole provided with a releasing electromagnetic coil arranged on another side opposite said hammer, the improvement comprising an armature disposed on the side where said hammer tip of said plate spring hammer is provided, and a yoke formed with a through hole or notch within which said armature is movable, said attracting magnetic pole being arranged between said hammer tip and said armature.
Claim 3
Dependent Claim
20 words
A printing head for a printer according to claim 1, wherein the armature is in the form of a cup.
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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |