Patent US3643594A successfully refreshed from Google Patents.
US3643594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Print hammer for high-speed printer
Assignee: Italtel SpA
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Filing: 1969-06-09
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Granted: 1972-02-22
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Expires: 1989-06-09
Abstract
Abstract An electromagnetically actuated print hammer comprises two rockers independently pivoted on a common axle, one rocker carrying a striker and being urged by spring force against the other rocker which has a long lever arm acting upon the strikercarrying rocker and a short lever arm carrying an armature attractable by an electromagnet; upon energization of the electromagnet, the armature-carrying rocker is arrested before the striker contacts the working surface.
Inventors
- 👤 Roberto Pipitone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:58
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/26; B41J9/38; B41J9/02; B41J9/127
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
135 words
A print hammer comprising a support, a first rocker pivotally mounted on said support, a second rocker pivotally mounted on said support on a common pivotal axle with said first rocker for swinging entrainment thereby, a striker on said second rocker confronting a working surface, resilient means engaging said second rocker for holding same in contact with said first rocker at a location remote from said axle while urging said striker away from said working surface, electromagnetic actuating means on said support, an armature on said first rocker confronting said actuating means for displacement thereby to swing said first rocker in a direction driving said striker toward said printing surface against the force of said resilient means, and abutment means for arresting the swing of said first rocker before said striker contacts said working surface.
Claim 2
Dependent Claim
135 words
A print hammer comprising a support, a first rocker pivotally mounted on said support, a second rocker pivotally mounted on said support on a common pivotal axle with said first rocker for swinging entrainment thereby, a striker on said second rocker confronting a working surface, resilient means engaging said second rocker for holding same in contact with said first rocker at a location remote from said axle while urging said striker away from said working surface, electromagnetic actuating means on said support, an armature on said first rocker confronting said actuating means for displacement thereby to swing said first rocker in a direction driving said striker toward said printing surface against the force of said resilient means, and abutment means for arresting the swing of said first rocker before said striker contacts said working surface.
Claim 3
Dependent Claim
28 words
A pring hammer as defined in claim 1 wherein said first rocker comprises a pair of generally parallel levers fulcrumed on said axle, said armature spanning said levers.
Claim 4
Dependent Claim
34 words
A pring hammer as defined in claim 2 wherein each of said levers has a short arm secured to said armature and a long arm with a free end bearing upon said second rocker.
Claim 5
Dependent Claim
21 words
A print hammer as defined in claim 3 wherein said first rocker is of reduced mass compared with said second rocker.
Claim 6
Dependent Claim
30 words
A print hammer as defined in claim 4 wherein said first rocker consists of lightweight material and said long arms have a width decreasing with increasiNg distance from said axle.
Claim 7
Dependent Claim
43 words
A print hammer as defined in claim 3 wherein said first rocker further comprises a bridge piece interconnecting the free ends of the long arms of said levers, said bridge piece contacting said second rocker at a location in line with said striker.
Claim 8
Dependent Claim
36 words
A print hammer as defined in claim 6, further comprising adjustable backstop means on said support bearing upon said bridge piece for limiting the reverse swing of said first rocker in response to said resilient means.
Claim 9
Dependent Claim
35 words
A print hammer as defined in claim 3 wherein said actuating means comprises a coil with an E-core having three pole faces confronting said armature, said core lying in a plane parallel to said axle.
Claim 10
Dependent Claim
30 words
A print hammer as defined in claim 8 wherein said core consists of ferrosilicon laminations parallel to said plane, said actuating means further including permeable shield means for said core.
Claim 11
Dependent Claim
60 words
A print hammer as defined in claim 3 wherein the short arms of said levers have free extremities extending beyond said armature and forming part of said abutment means, said support comprising a base carrying said actuating means, said base being provided with guide slots for said short arms, the ends of said guide slots constituting stops for said extremities.
Claim 12
Dependent Claim
29 words
A print hammer as defined in claim 1 wherein said actuating means comprises a coil and a damping circuit including a diode and a resistance connected across said coil.
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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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |