US4091909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wire matrix printer printhead assembly
Assignee: Texas Instruments Inc
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Filing: 1976-09-07
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Granted: 1978-05-30
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Expires: 1996-09-07
Abstract
Abstract A wire matrix printer mechanism is designed to print a series of alpha-numeric characters and symbols by mechanically impacting an inked ribbon with a column of small diameter steel wires, driving the ribbon into paper riding on a platen. The body through which the print members pass is a molded structure having a separate channel for each print member. Each channel has a path consistent with the elastic curvature of the corresponding print member to provide a path of least resistance.
Inventors
- 👤 Gene DuPree Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:02
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/235; B41J2/265
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
198 words
In a matrix printer mechanism having a printhead-carriage assembly and a print medium, the printhead comprising: (a) a plurality of print members, each having an impression end and an activation end; (b) a front bearing array through which the impression ends pass, disposed in confronting relation to the print medium; (c) drive means operatively connected to the activation ends to selectively drive the impression ends into contact with the print medium; and (d) a body assembly, terminating at one end in the front bearing array and mounting the drive means at the opposite end, having integral therewith a plurality of print member channels communicating with the front bearing array and the drive means, each channel containing one print member and each having a path consistent with the elastic curvature of the member contained therein, the body assembly comprising an upper section having a generally flat lower surface, a center section having generally flat upper and lower surfaces, and a lower section having a generally flat upper surface, the print member channels being formed as grooves in the respective flat surfaces with the non-grooved portions of the flat surfaces completely enclosing the grooves to form the print member channels.
Claim 2
Dependent Claim
198 words
In a matrix printer mechanism having a printhead-carriage assembly and a print medium, the printhead comprising: (a) a plurality of print members, each having an impression end and an activation end; (b) a front bearing array through which the impression ends pass, disposed in confronting relation to the print medium; (c) drive means operatively connected to the activation ends to selectively drive the impression ends into contact with the print medium; and (d) a body assembly, terminating at one end in the front bearing array and mounting the drive means at the opposite end, having integral therewith a plurality of print member channels communicating with the front bearing array and the drive means, each channel containing one print member and each having a path consistent with the elastic curvature of the member contained therein, the body assembly comprising an upper section having a generally flat lower surface, a center section having generally flat upper and lower surfaces, and a lower section having a generally flat upper surface, the print member channels being formed as grooves in the respective flat surfaces with the non-grooved portions of the flat surfaces completely enclosing the grooves to form the print member channels.
Claim 3
Dependent Claim
26 words
The printhead of claim 1 wherein the drive means include means for reversing the previously activated print members to move them away from the print medium.
Claim 4
Dependent Claim
15 words
The printhead of claim 2 wherein the body assembly is formed of a thermoplastic material.
Claim 5
Dependent Claim
16 words
The printhead of claim 2 wherein the body assembly is formed of a thermal setting material.
Claim 6
Dependent Claim
28 words
The printhead of claim 1 wherein the drive means comprise a plurality of solenoids, each attached to a respective print member to positively drive the print member forward.
Claim 7
Dependent Claim
28 words
The printhead of claim 3 wherein the drive means comprise a plurality of solenoids, each attached to a respective print member to positively drive the print member forward.
Claim 8
Dependent Claim
33 words
The printhead of claim 3 wherein there are seven print members and channels therefor, and the front bearing array is arranged in a column of seven bearings through which the impression ends pass.
Claim 9
Dependent Claim
33 words
The printhead of claim 5 wherein there are seven print members and channels therefor, and the front bearing array is arranged in a column of seven bearings through which the impression ends pass.
References Cited (Backward Citations)
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Cited
US3584575A
Cited
US3672482A
Cited
US3795298A
Cited
US3897865A
Cited
US4400671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |