US4014425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording element for a matrix printer
Assignee: US Philips Corp
•
Filing: 1975-11-20
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Granted: 1977-03-29
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Expires: 1995-11-20
Abstract
Abstract A recording element for a matrix printer having an armature which is capable of movement relative to a casing under spring action by means of electric energization and to which a recording stylus is secured. The restoring spring surrounding the stylus is centered in the element in that its two end parts each comprise a plurality of closely wound turns. The spring part intermediate the end parts provides the spring action. Thus wear of the spring and the stylus due to rubbing contact is avoided.
Inventors
- 👤 Wilhelmus Adrianus Henricus Gijzen
- 👤 Theodorus Gerhardus Potma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:02
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/27; B41J2/285
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
195 words
A recording element for a matrix printer which comprises a casing, a stylus carried for longitudinal motion with respect to said casing, a coil spring, having first and second ends, biasing said stylus in one direction, and means responsive to electric energization to bias said stylus in a direction opposite to said one direction, said spring being disposed around said stylus and within said casing, said coil spring having a plurality of turns at said first end disposed in axial abutting relationship in compressed and uncompressed modes of the entire spring and having means for preventing relative axial motion between said first end and said stylus, said means including the inside diameter of said plurality of coils of said first end being sized for sufficiently tight fitting engagement with said stylus to prevent relative axial movement between said stylus and said first end during operation of said recording element, said coil spring having an axial section intermediate said first end and said second end, said axial section having a plurality of coils disposed in axial spaced relation and having an inside diameter greater than the outside diameter of said stylus disposed within said axial section.
Claim 2
Dependent Claim
195 words
A recording element for a matrix printer which comprises a casing, a stylus carried for longitudinal motion with respect to said casing, a coil spring, having first and second ends, biasing said stylus in one direction, and means responsive to electric energization to bias said stylus in a direction opposite to said one direction, said spring being disposed around said stylus and within said casing, said coil spring having a plurality of turns at said first end disposed in axial abutting relationship in compressed and uncompressed modes of the entire spring and having means for preventing relative axial motion between said first end and said stylus, said means including the inside diameter of said plurality of coils of said first end being sized for sufficiently tight fitting engagement with said stylus to prevent relative axial movement between said stylus and said first end during operation of said recording element, said coil spring having an axial section intermediate said first end and said second end, said axial section having a plurality of coils disposed in axial spaced relation and having an inside diameter greater than the outside diameter of said stylus disposed within said axial section.
Claim 3
Dependent Claim
19 words
Apparatus as claimed in claim 1, wherein a plurality of said coils of said axial section have equal diameters.
Claim 4
Dependent Claim
54 words
Apparatus as claimed in claim 1 wherein said coils of said second end are disposed in axially abutting relationship in compressed and uncompressed modes of said axial section and having the outside diameter thereof sized for tight fitting engagement with said casing to prevent relative axial movement therebetween during operation of said recording element.
Claim 5
Dependent Claim
32 words
Apparatus as described in claim 3 wherein said casing has walls surrounding said axial portion of said spring, said walls being disposed in spaced relation to said axial portion of said spring.
References Cited (Backward Citations)
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Cited
US2923520A
Cited
US3729079A
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US3665353A
Cited
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Cited
US3831729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |