Patent US4644103A successfully refreshed from Google Patents.
Patent US4359937A successfully refreshed from Google Patents.
US4359937A
Expired / Lapsed
US
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Dot matrix printer
Assignee: International Business Machines Corp
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Filing: 1981-05-07
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Granted: 1982-11-23
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Expires: 2001-05-07
Abstract
Abstract A dot matrix printer is provided which has a row of hammer elements having horizontal impactor bars aligned at upper and lower levels and in partial overlapping relation with adjacent impactor bars. A row of print elements is also provided which alternately have horizontal upper and lower level non-overlapping impact receiving bars positioned opposite the hammer elements and in alignment with corresponding upper and lower impactor bars. Each print element has a dot print element on its opposite side and the row of print elements is mounted on a reciprocating shuttle. Means are provided for actuating the hammer elements whereby selected hammer impactor bars will impact the impact receiving bars to effect transverse deflection of the print elements to form dot impressions on a print medium.
Inventors
- 👤 Edward F. Helinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:48
CPC Classifications
B; B41; B41J; B41J25/00; B41J25/001; B41J25/006; B41J2/00; B41J2/22; B41J2/31; B41J9/00; B41J9/02; B41J9/127
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
A dot matrix printer for forming dot impressions on a print medium which comprises; a single horizontal row of uniformly spaced cantilevered hammer elements, said hammer elements alternately having horizontal impactor bars aligned at upper and lower levels and in partial overlapping relation with adjacent impactor bars, a single horizontal row of uniformly spaced cantilevered print elements alternately having horizontal upper and lower level non-overlapping impact receiving bars positioned opposite said hammer elements and in alignment with corresponding upper and lower impactor bars, dot print elements on the opposite sides of said print elements, means for effecting horizontal reciprocation of said print elements with respect to said hammer elements, and means for actuating said hammer elements whereby selected hammer impactor bars will impact said impact receiving bars to effect transverse deflection of the print elements to form dot impressions on said print medium.
Claim 2
Dependent Claim
143 words
A dot matrix printer for forming dot impressions on a print medium which comprises; a single horizontal row of uniformly spaced cantilevered hammer elements, said hammer elements alternately having horizontal impactor bars aligned at upper and lower levels and in partial overlapping relation with adjacent impactor bars, a single horizontal row of uniformly spaced cantilevered print elements alternately having horizontal upper and lower level non-overlapping impact receiving bars positioned opposite said hammer elements and in alignment with corresponding upper and lower impactor bars, dot print elements on the opposite sides of said print elements, means for effecting horizontal reciprocation of said print elements with respect to said hammer elements, and means for actuating said hammer elements whereby selected hammer impactor bars will impact said impact receiving bars to effect transverse deflection of the print elements to form dot impressions on said print medium.
Claim 3
Dependent Claim
61 words
A dot matrix printer as set forth in claim 1 wherein said print elements are mounted on a shuttle, and said reciprocating means effects reciprocation of said shuttle and print elements whereby said impact receiving bars have a horizontal stroke distance which does not exceed the horizontal width of said impactor bars plus the horizontal width of said impact receiving bars.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |