US3640217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Print hammer control means for pivotally mounted-type members
Assignee: International Business Machines Corp
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Filing: 1969-12-22
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Granted: 1972-02-08
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Expires: 1989-12-22
Abstract
Abstract A printer has a plurality of print hammers which impact pivotaltype levers carried by type carriers moving along a track adjacent the print line. Cam surfaces on the body of the carrier cooperate with portions of the print hammer to prevent interference between the print hammer and an adjacent type lever when printing.
Inventors
- 👤 John E Drejza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:20
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/02; B41J9/10; B41J1/00; B41J1/20; E; E21; E21B; E21B10/00; E21B10/08; E21B10/18; E21B7/00; E21B7/007
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
In a printer having a type carrier element movable along a print line past a plurality of print positions on a document and carrying one or more type members movable relative to said carrier element transversely of the direction of motion of said carrier element to impact said document for printing thereon, a plurality of print hammers positioned in print positions along said print line selectively operable from a rest position in a direction transversely of said print line to an operated position to impact selected type members and move them against the document as they pass along said print line, and cam means on the carrier element positioned on opposite sides of each said type member along the line of motion of said carrier member to engage a portion of one of said print hammers which is in said operated position, when said print hammer is other than in proper alignment with a selected type member in the direction of motion of said carrier element and cam said print hammer toward its rest position.
Claim 2
Dependent Claim
175 words
In a printer having a type carrier element movable along a print line past a plurality of print positions on a document and carrying one or more type members movable relative to said carrier element transversely of the direction of motion of said carrier element to impact said document for printing thereon, a plurality of print hammers positioned in print positions along said print line selectively operable from a rest position in a direction transversely of said print line to an operated position to impact selected type members and move them against the document as they pass along said print line, and cam means on the carrier element positioned on opposite sides of each said type member along the line of motion of said carrier member to engage a portion of one of said print hammers which is in said operated position, when said print hammer is other than in proper alignment with a selected type member in the direction of motion of said carrier element and cam said print hammer toward its rest position.
Claim 3
Dependent Claim
41 words
The inveNtion as defined in claim 1 characterized by said type carrier having a plurality of closely spaced apart type members comprising type levers pivotally mounted on a pivot shaft extending in the direction of motion of said type carrier element.
Claim 4
Dependent Claim
37 words
The invention as defined in claim 2 characterized by said type carrier element having inclined cam surface projections on said carrier element located on either side of a preferred type lever impact position with a print hammer.
Claim 5
Dependent Claim
76 words
The invention as defined in claim 3 characterized by said cam members on the carrier element being spaced apart further than the width of the engaging portion of said type hammer to allow lateral movement in the direction of motion of said carrier element of said selected type lever relative to said type hammer between the time of initial impact with said print hammer and the time of printing by said type lever impacting said document.
Claim 6
Dependent Claim
48 words
The invention as defined in claim 4 characterized by said engaging portion of said type hammer comprising a cam member with a sloping surface which is displaced from the center of said type hammer in the opposite direction to the direction of movement of said type carrier element.
Claim 7
Dependent Claim
38 words
The invention as defined in claim 5 characterized by said cam member on said type hammer having unsymmetrical leading and trailing inclined cam surfaces, said trailing cam surface having a greater angular inclination than said leading cam surface.
Claim 8
Dependent Claim
50 words
The invention as defined in claim 6 characterized by said type carrier element having raised cam members on said carrier element positioned between each of said type levers carried by said carrier element and having oppositely disposed inclined plane surfaces along the line of movement of said type carrier element.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |