US3585927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pivotally mounted high performance print magnet
Assignee: International Business Machines Corp
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Filing: 1969-12-22
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Granted: 1971-06-22
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Expires: 1989-12-22
Abstract
Abstract In a high performance print magnet, magnet yokes are independently resiliently mounted on a common support, the yoke is tapered at the pole face to concentrate the flux attracting the armature, and the push rod used to actuate a pivoted print hammer is spring biased to hold the magnet armature against a back stop and prevent the push rod from following the print hammer after the magnet armature seals.
Inventors
- 👤 Robert C Burns
- 👤 John E Drejza
- 👤 Donald F Manning
- 👤 Richard L Stark
- 👤 Donald J Stiles
- 👤 Joseph E Wallace
- 👤 Joseph T Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:49
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/26; B41J9/38
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
In a printer apparatus having a moving type element and a pivoted print hammer mechanism for impacting said type element and a print medium, an electromagnet actuator comprising a magnetizable core member having an armature pivotally mounted thereon and having an operating winding, a slender column push rod operatively connecting said armature and said print hammer, support means pivotally supporting the electromagnet actuator core member, and resilient means biasing the core member to a predetermined position relative to said support means.
Claim 2
Dependent Claim
81 words
In a printer apparatus having a moving type element and a pivoted print hammer mechanism for impacting said type element and a print medium, an electromagnet actuator comprising a magnetizable core member having an armature pivotally mounted thereon and having an operating winding, a slender column push rod operatively connecting said armature and said print hammer, support means pivotally supporting the electromagnet actuator core member, and resilient means biasing the core member to a predetermined position relative to said support means.
Claim 3
Dependent Claim
39 words
The invention as defined in claim 1 characterized by a pair of side plates secured to said core member, said side plates carrying one pivot for said armature and another pivot connecting said core member to said support means.
Claim 4
Dependent Claim
44 words
The invention as defined in claim 2 characterized by said core member comprising a generally U-shaped structure having two legs with said armature mounted therebetween and having said operating winding on one leg and a back stop for said armature on the other leg.
Claim 5
Dependent Claim
46 words
The invention as defined in claim 3 characterized by said support means comprising an L-shaped member having a lower leg disposed to be secured to a common support bar for a plurality of electromagnet actuators and an upright leg disposed to engage said other core leg.
Claim 6
Dependent Claim
29 words
The invention as defined in claim 4 characterized by means on said push rod biasing said push rod and said armature to a rest position against said back stop.
Claim 7
Dependent Claim
47 words
The invention as defined in claim 5 characterized by said operating winding being located on a horizontal core projection from said one leg, said core projection having a pole face adjacent said armature with a tapered end portion which concentrates the magnetic flux at said pole face.
Claim 8
Dependent Claim
30 words
The invention as defined in claim 6 characterized by said operating winding having a magnetic shield of spring steel with end portions inturned in close relation with the core projection.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |