US4208138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dot matrix printer head
Assignee: Wincor Nixdorf International GmbH
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Filing: 1978-04-10
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Granted: 1980-06-17
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Expires: 1998-04-10
Abstract
Abstract A dot matrix printer with a plurality of armature magnet units mounted on a printer head bracket, each armature magnet unit having an armature with a printing needle attached at one end and pivotally secured to a magnet yoke shank at the other end by one end of a U-shaped spring bracket. The spring bracket fits around the magnet yoke and the other end of the spring bracket is secured to a guide piece for limiting the stroke of the armature end carrying the printing needle.
Inventors
- 👤 Hans-Werner Volke
- 👤 Juergen Hilkenmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:50
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/27; B41J2/275
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
160 words
A dot matrix printer head having a printer head bracket and a plurality of armature magnet units mounted on the printer head bracket, each armature magnet unit comprising: a U-shaped magnetic yoke having two substantially parallel shanks, each shank having a free end and a leg connecting the other ends of the shanks together, an elongated armature disposed across the free ends of said shanks, said armature having a printing needle secured to one end, a U-shaped spring bracket positioned aroung the leg of said magnetic yoke, said spring bracket having one end which engages the other end of the armature adjacent the free end of one shank and pivots said armature against said last mentioned shank and away from the free end of the other shank, and a guide piece disposed at least partially around said armature to thereby limit its pivotal movement, whereby elastic deformation of the spring bracket enables said armature to pivot about said one shank.
Claim 2
Dependent Claim
160 words
A dot matrix printer head having a printer head bracket and a plurality of armature magnet units mounted on the printer head bracket, each armature magnet unit comprising: a U-shaped magnetic yoke having two substantially parallel shanks, each shank having a free end and a leg connecting the other ends of the shanks together, an elongated armature disposed across the free ends of said shanks, said armature having a printing needle secured to one end, a U-shaped spring bracket positioned aroung the leg of said magnetic yoke, said spring bracket having one end which engages the other end of the armature adjacent the free end of one shank and pivots said armature against said last mentioned shank and away from the free end of the other shank, and a guide piece disposed at least partially around said armature to thereby limit its pivotal movement, whereby elastic deformation of the spring bracket enables said armature to pivot about said one shank.
Claim 3
Dependent Claim
21 words
The invention as defined in claim 1 wherein said guide piece is secured to the other end of said spring bracket.
Claim 4
Dependent Claim
24 words
The invention as defined in claim 2 wherein said spring bracket includes a generally V-shaped tab which engages said other end of said armature.
Claim 5
Dependent Claim
17 words
The invention as defined in claim 2 wherein said guide piece is constructed of a synthetic material.
Claim 6
Dependent Claim
34 words
The invention as defined in claim 2 and further comprising a journal integrally formed with said magnetic yoke and extending outwardly from said connecting leg and through an opening formed in the spring bracket.
Claim 7
Dependent Claim
37 words
The invention as defined in claim 2 wherein said spring bracket further comprises a pair of facing locking tabs which engage slots formed in said one shank which run parallel to the length of said one shank.
Claim 8
Dependent Claim
75 words
The invention as defined in claim 2 wherein said guide pieces includes a slot and wherein said guide piece is secured to said spring bracket by a screw extending through said slot and engaging a threaded bore in the spring bracket, the length of the slot in the direction parallel to the axes of the shank being greater than the diameter of the screw whereby said guide piece is adjustably secured to said spring bracket.
Claim 9
Dependent Claim
66 words
The invention as defined in claim 2, wherein the spring bracket has an opening substantially equal in width to the thickness of the magnet yoke, said opening being formed at the junction of said one shank and said connecting leg, said opening forming a pair of connecting cross bridges on the spring bracket, said cross bridges being elastically deformed upon activation of the armature magnet unit.
Claim 10
Dependent Claim
17 words
The invention as defined in claim 2 wherein the guide piece is made of shock absorbing material.
Claim 11
Dependent Claim
22 words
The invention as defined in claim 9 wherein the guide piece is provided with lateral guide pieces for guidance of said armature.
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) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |