US3749008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Print hammer assembly
Assignee: International Business Machines Corp
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Filing: 1971-02-04
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Granted: 1973-07-31
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Expires: 1991-02-04
Abstract
Abstract A print hammer assembly is provided for a high speed impact printer wherein a pivoted armature is utilized with a print hammer mounted thereon for initial unitary pivotal motion during which kinetic energy is imparted to the hammer and a terminal period during which the armature is stopped and the print hammer is guided through an over traveled print stroke by a parallel spring mounting that also biases the hammer away from a print condition and toward engagement with the armature.
Inventors
- 👤 J Carlson
- 👤 W Kempke
- 👤 L Zolnosky
- 👤 J Schweihs
- 👤 M Syverson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:53
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/42; B41J9/02; B41J9/10; B41J9/26; B41J9/38
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
215 words
In a high speed printer, a print hammer assembly comprising: a pivotably mounted armature assembly of unitary construction including a rigid armature portion, a print hammer having a recessed propelling surface, resilient mounting means including a pair of substantially parallel leaf spring elements each connected at one end thereof to said rigid armature portion and at the opposite end to said print hammer, a preload insert extending from and forming a part of said rigid armature portion and engaging the recessed propelling surface of said print hammer in a lost motion connection; biasing means engaging said armature assembly for urging said armature assembly in a non-printing pivotal direction; electromagnetic actuating means positioned for selectively pivoting said armature assembly in a printing pivotal direction; stop means for limiting motion of said armature assembly in said printing pivotal direction, said stop means being positioned to interrupt pivoting of said armature assembly in said printing pivotal direction before said print hammer effects printing engagement, whereby upon energizing said electromagnetic actuating means, said armature assembly is pivoted in said printing pivotal direction against the force of said biasing means to a position of engagement with said stop means and thereafter said print hammer, enabled by said lost motion connection, over-travels in a printing direction to effect a print cycle.
Claim 2
Dependent Claim
215 words
In a high speed printer, a print hammer assembly comprising: a pivotably mounted armature assembly of unitary construction including a rigid armature portion, a print hammer having a recessed propelling surface, resilient mounting means including a pair of substantially parallel leaf spring elements each connected at one end thereof to said rigid armature portion and at the opposite end to said print hammer, a preload insert extending from and forming a part of said rigid armature portion and engaging the recessed propelling surface of said print hammer in a lost motion connection; biasing means engaging said armature assembly for urging said armature assembly in a non-printing pivotal direction; electromagnetic actuating means positioned for selectively pivoting said armature assembly in a printing pivotal direction; stop means for limiting motion of said armature assembly in said printing pivotal direction, said stop means being positioned to interrupt pivoting of said armature assembly in said printing pivotal direction before said print hammer effects printing engagement, whereby upon energizing said electromagnetic actuating means, said armature assembly is pivoted in said printing pivotal direction against the force of said biasing means to a position of engagement with said stop means and thereafter said print hammer, enabled by said lost motion connection, over-travels in a printing direction to effect a print cycle.
Claim 3
Dependent Claim
31 words
The high speed printer of claim 1 wherein said armature assembly rigid armature portion, resilient mounting means and print hammer form portions of a single molded part including a plastic matrix.
Claim 4
Dependent Claim
96 words
The high speed printer of claim 2 wherein said lost motion connection comprises a recess in said print hammer intermediate said leaf spring elements, and said preload insert extends into said recess and normally engages a recess wall portion facing in a non-printing pivotal direction to displace said print hammer against the biasing force of said leaf spring elements to provide positive initial movement in a printing direction and to permit said print hammer to move in a printing direction out of engagement with said preload insert against the biasing force of said resilient mounting means.
Claim 5
Dependent Claim
26 words
The high speed printer of claim 3 wherein said resilient mounting means leaf spring elements are formed of a plastic matrix filled with longitudinally aligned fibers.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |