Patent US3755700A successfully refreshed from Google Patents.
US3755700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic drive
Assignee: Wincor Nixdorf International GmbH
•
Filing: 1972-04-20
•
Granted: 1973-08-28
•
Expires: 1992-04-20
Abstract
Abstract An electromagnetic drive for the needle of a needle printer comprising a pair of cylindrical magnet pole shoes disposed within a cylindrical magnet coil and connected with the needle.
Inventors
- 👤 H Buschmann
- 👤 E Mehlhart
- 👤 E Pomplun
- 👤 A Schwibbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:20
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/27; B41J2/285
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
An electromagnetic drive for the needle of a needle printer, comprising a cylindrical magnet coil, an armature disposed within said coil and operable upon said coil being energized to move said armature axially with respect to said coil, said armature being connected to said needle such that axial, reciprocal movement of said armature produces corresponding movement of said needle, a pair of axially spaced cylindrical pole members disposed intermediate said armature and said coil, an electrically conductive cylindrical member encompassing said armature and disposed intermediate said spaced pole members; and said armature comprising a first member and a second member, said first member being joined to said second member and being magnetically conductive; said second member being magnetically and electrically non-conductive.
Claim 2
Dependent Claim
121 words
An electromagnetic drive for the needle of a needle printer, comprising a cylindrical magnet coil, an armature disposed within said coil and operable upon said coil being energized to move said armature axially with respect to said coil, said armature being connected to said needle such that axial, reciprocal movement of said armature produces corresponding movement of said needle, a pair of axially spaced cylindrical pole members disposed intermediate said armature and said coil, an electrically conductive cylindrical member encompassing said armature and disposed intermediate said spaced pole members; and said armature comprising a first member and a second member, said first member being joined to said second member and being magnetically conductive; said second member being magnetically and electrically non-conductive.
Claim 3
Dependent Claim
23 words
The device as defined in claim 1 and including spring means urging said armature to a retracted position upon deenergization of said coil.
Claim 4
Dependent Claim
48 words
The drive according to claim 1, characterized in that the magnet coil is surrounded by a magnetically conductive metal sheath which is slotted in the longitudinal direction of the magnet coil and connected with magnetically conductive coil flanges which connect the metal sheath with the magnet pole shoes.
Claim 5
Dependent Claim
16 words
The drive according to claim 2, characterized in that said spring means is a helical spring.
Claim 6
Dependent Claim
22 words
The drive according to claim 4, characterized in that said second member of the armature forms a chamber receiving the helical spring.
Claim 7
Dependent Claim
40 words
The drive according to claim 4, characterized in that the needle is passed into the magnet coil through a threaded pin which permits adjustment of the range of motion of the armature and serves as outer support for the spring.
Claim 8
Dependent Claim
39 words
The drive according to claim 7, characterized in that there is provided a damping disk, the position of which is adjustable by a threaded pin which is disposed at the end of the Magnet coil remote from the needle.
Claim 9
Dependent Claim
40 words
The drive according to claim 7, characterized in that the damping disk is provided with a central opening which is connected with the outer space of the drive via a central bore of the threaded pin supporting the damping disk.
References Cited (Backward Citations)
US235948A
Cited
US1128036A
Cited
US1992770A
Cited
US2286176A
Cited
US2469137A
Cited
US3149255A
Cited
DE1254388B
Cited
US3372262A
Cited
DE1806714A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |