Patent US3875859A successfully refreshed from Google Patents.
US3875859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed printer
Assignee: Addmaster Corp
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Filing: 1973-10-12
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Granted: 1975-04-08
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Expires: 1993-10-12
Abstract
Abstract A cyclically operable high speed data printer comprising a plurality of type wheels supported and yieldably driven by a drive shaft, each wheel having character position stops and a home stop. The drive shaft is driven through two revolutions in the same direction for each cycle. During the first revolution, stop devices are spring actuated at different times to engage certain of the character position stops to arrest the type wheels in different type printing positions. Printing occurs after the first revolution, and during the second revolution, the stop devices are positioned to arrest the home stops whereby to locate the wheels in their home positions.
Inventors
- 👤 Richard E Busch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:56
CPC Classifications
B; B41; B41J; B41J1/00; B41J1/22; B41J1/32; B41J1/44; B41J1/46; B41J1/48; B41J7/00; B41J7/48
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
162 words
A cyclically operable printing apparatus comprising a rotatable type wheel having type characters spaced therearound, character position stops on said wheel, a home position stop on said wheel, means including a driven gear for yieldably driving said type wheel; means including an interrupted gear having two spaced sets of gear teeth for intermittently rotating said driven gear, means for rotating said interrupted gear during each cycle of said printing apparatus, a stop device, means operable during rotation of said driven gear by a first one of said sets of gear teeth to locate said stop device in position to arrest one of said character position stops whereby to locate a selected one of said type characters at a printing line, printing impression means for thereafter printing said selected type character on a record medium, and means operable during rotation of said drive gear by said second set of gear teeth to locate said stop device in position to arrest said home stop.
Claim 2
Dependent Claim
162 words
A cyclically operable printing apparatus comprising a rotatable type wheel having type characters spaced therearound, character position stops on said wheel, a home position stop on said wheel, means including a driven gear for yieldably driving said type wheel; means including an interrupted gear having two spaced sets of gear teeth for intermittently rotating said driven gear, means for rotating said interrupted gear during each cycle of said printing apparatus, a stop device, means operable during rotation of said driven gear by a first one of said sets of gear teeth to locate said stop device in position to arrest one of said character position stops whereby to locate a selected one of said type characters at a printing line, printing impression means for thereafter printing said selected type character on a record medium, and means operable during rotation of said drive gear by said second set of gear teeth to locate said stop device in position to arrest said home stop.
Claim 3
Dependent Claim
195 words
Printing apparatus comprising a rotatable type wheel having type characters spaced thereon, character position stops on said wheel, said stops being all located at the same radial distance from the axis of said wheel, a home stop on said wheel, said home stop being located at a different radial distance from said axis than said character stops, means for rotating said wheel in one direction only, first and second fulcrums, a stop pawl, a magnet armature connected to said stop pawl, magnet means normally maintaining said armature in engagement with said first fulcrum, yieldable means normally maintaining said armature in engagement with said second fulcrum, said armature maintaining said stop pawl in the path of said home stop when said armature is in engagement with both of said fulcrums, means for rocking said armature about said first fulcrum whereby to locate said stop pawl out of the path of all of said stops, and means for at least reducing the magnetic flux of said magnet means to enable said yieldable means to move said armature about said second fulcrum whereby to locate said stop pawl in the path of one of said character position stops.
Claim 4
Dependent Claim
195 words
Printing apparatus comprising a rotatable type wheel having type characters spaced thereon, character position stops on said wheel, said stops being all located at the same radial distance from the axis of said wheel, a home stop on said wheel, said home stop being located at a different radial distance from said axis than said character stops, means for rotating said wheel in one direction only, first and second fulcrums, a stop pawl, a magnet armature connected to said stop pawl, magnet means normally maintaining said armature in engagement with said first fulcrum, yieldable means normally maintaining said armature in engagement with said second fulcrum, said armature maintaining said stop pawl in the path of said home stop when said armature is in engagement with both of said fulcrums, means for rocking said armature about said first fulcrum whereby to locate said stop pawl out of the path of all of said stops, and means for at least reducing the magnetic flux of said magnet means to enable said yieldable means to move said armature about said second fulcrum whereby to locate said stop pawl in the path of one of said character position stops.
Claim 5
Dependent Claim
22 words
Printing apparatus according to claim 2 wherein said first fulcrum comprises a magnet frame for inducing a magnetic flux in said armature.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |