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US4091909A Expired / Lapsed US ⏱️ 0.0 years remaining

Wire matrix printer printhead assembly

Assignee: Texas Instruments Inc
•
Filing: 1976-09-07
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Granted: 1978-05-30
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Expires: 1996-09-07
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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)

US3592311A 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

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