US4143979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printhead needle cap
Assignee: Texas Instruments Inc
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Filing: 1977-05-04
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Granted: 1979-03-13
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Expires: 1997-05-04
Abstract
Abstract A print member of the printhead of a ballastic type wire matrix printer terminates in an impression end and in an activation end. A cap is formed at the activation end for contact by the blade-like armature of an activating electromagnet. A tip is formed at the activating end of the member with a first layer of a relatively stiff plastic material affixed to and surrounding the tip and a second layer of relatively tough and abrasion resistive plastic material is affixed to the first layer and positioned to be contacted by the armature.
Inventors
- 👤 Alfred K. Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:50
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/235; B41J2/25; B41J2/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A ballastic wire matrix printhead for a multicopy printer including a body, at least one electromagnet mounted within the body and having a blade-like armature, and at least one print member having an actuation and selectively contacted by the armature and having an impression end for contacting a print medium, the print member comprising: (a) a needle terminating in the activation end and in the impression end; (b) a first layer of stiff plastic material affixed to and surrounding the activation end of the needle; and (c) a second layer of tough and abrasion resistive plastic material affixed to the first layer and positioned to be contacted by the armature.
Claim 2
Dependent Claim
110 words
A ballastic wire matrix printhead for a multicopy printer including a body, at least one electromagnet mounted within the body and having a blade-like armature, and at least one print member having an actuation and selectively contacted by the armature and having an impression end for contacting a print medium, the print member comprising: (a) a needle terminating in the activation end and in the impression end; (b) a first layer of stiff plastic material affixed to and surrounding the activation end of the needle; and (c) a second layer of tough and abrasion resistive plastic material affixed to the first layer and positioned to be contacted by the armature.
Claim 3
Dependent Claim
113 words
A ballastic wire matrix printhead for a multicopy printer including a body, at least one electromagnet mounted within the body and having a blade-like armature, and at least one print member having an activation end selectively contacted by the armature and having an impression end for contacting a print medium, the print member comprising: (a) a needle, terminating in the activation end and the impact end; (b) a tip, formed on the activation end; (c) a first layer of stiff plastic material affixed to and surrounding the tip; and (d) a second layer of tough and abrasion resistive plastic material affixed to the first layer and positioned to be contacted by the armature.
Claim 4
Dependent Claim
113 words
A ballastic wire matrix printhead for a multicopy printer including a body, at least one electromagnet mounted within the body and having a blade-like armature, and at least one print member having an activation end selectively contacted by the armature and having an impression end for contacting a print medium, the print member comprising: (a) a needle, terminating in the activation end and the impact end; (b) a tip, formed on the activation end; (c) a first layer of stiff plastic material affixed to and surrounding the tip; and (d) a second layer of tough and abrasion resistive plastic material affixed to the first layer and positioned to be contacted by the armature.
Claim 5
Dependent Claim
13 words
The print member of claim 2 wherein the tip is a metal cap.
Claim 6
Dependent Claim
21 words
The print member of claim 2 wherein the tip is the activation end of the needle bent into an arcuate form.
Claim 7
Dependent Claim
33 words
The print member of claim 1 wherein the first layer is an acetal copolymer having a flectural modulus in the order of 350,000 psi and the second layer is a thermoplastic urethane elastomer.
Claim 8
Dependent Claim
33 words
The print member of claim 2 wherein the first layer is an acetal copolymer having a flectural modulus in the order of 350,000 psi and the second layer is a thermoplastic urethane elastomer.
Claim 9
Dependent Claim
33 words
The print member of claim 3 wherein the first layer is an acetal copolymer having a flectural modulus in the order of 350,000 psi and the second layer is a thermoplastic urethane elastomer.
Claim 10
Dependent Claim
33 words
The print member of claim 4 wherein the first layer is an acetal copolymer having a flectural modulus in the order of 350,000 psi and the second layer is a thermoplastic urethane elastomer.
References Cited (Backward Citations)
DE2352698A1
Cited
US3929214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |