US3763803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewing machine electrical drive device
Assignee: Panasonic Holdings Corp
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Filing: 1972-11-27
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Granted: 1973-10-09
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Expires: 1992-11-27
Abstract
Abstract A sewing machine drive device in which a current interrupter comprising conducting rings, part of whose peripheries are insulated, and brushes, each being in contact with the periphery of the corresponding ring, is employed to make it possible to stop a sewing machine needle accurately in a desired position.
Inventors
- 👤 M Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:32
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/22; D05B69/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
206 words
A sewing machine electrical drive device comprising a main drive unit, a secondary drive unit that operates at reduced speed, a brake unit that controls the secondary drive unit, a clutch assembly for selective engagement with the main or secondary drive unit to drive a sewing machine upper spindle, a switch that is closed when said clutch assembly is engaged with the main drive unit and open when the clutch assembly is disengaged from the main drive unit and engaged with the secondary drive unit, a relay possessing a holding contact and contacts which control the above-mentioned brake unit, and a current interrupter fixedly mounted on the sewing machine upper spindle and comprising conducting rings, part of whose peripheries are non-conducting and into two of which grooves are cut at the respective non-conducting peripheries the length of the arc lying between the grooves in one ring being greater than that between the grooves in the other, and brushes which contact the said conducting rings, wherein the said relay is brought into connection with an electrical power source through the action of the said switch and through tHe said brushes in contact with said conducting rings and a series circuit in connection with the above-mentioned holding contact.
Claim 2
Dependent Claim
206 words
A sewing machine electrical drive device comprising a main drive unit, a secondary drive unit that operates at reduced speed, a brake unit that controls the secondary drive unit, a clutch assembly for selective engagement with the main or secondary drive unit to drive a sewing machine upper spindle, a switch that is closed when said clutch assembly is engaged with the main drive unit and open when the clutch assembly is disengaged from the main drive unit and engaged with the secondary drive unit, a relay possessing a holding contact and contacts which control the above-mentioned brake unit, and a current interrupter fixedly mounted on the sewing machine upper spindle and comprising conducting rings, part of whose peripheries are non-conducting and into two of which grooves are cut at the respective non-conducting peripheries the length of the arc lying between the grooves in one ring being greater than that between the grooves in the other, and brushes which contact the said conducting rings, wherein the said relay is brought into connection with an electrical power source through the action of the said switch and through tHe said brushes in contact with said conducting rings and a series circuit in connection with the above-mentioned holding contact.
Claim 3
Dependent Claim
202 words
A sewing machine electrical drive as claimed in claim 1, wherein the said current interrupter comprised a first metallic ring part of whose periphery is insulated by an insulator material around a central portion composed of an insulator material, a second metallic ring part of whose periphery is insulated by an insulator material around a central portion composed of an insulator material, said grooves being cut at the insulation portion at a distance from one another into the central portion, and a third metallic ring part of whose periphery is insulated by an insulator material around a central portion composed of an insulator material, said grooves being cut at the insulation portion at a distance from one another into the control portion, the distance of the third ring being greater than the distance of the second ring, the said three metallic rings being brought together by pressure engagement in which configuration the portions between grooves of the said two rings form insulated portions, the first ring contacting with a brush connected to the power source, the second ring contacting with a brush connected to the relay through the holding contact, and the third ring contacting with a brush connected to the relay.
Claim 4
Dependent Claim
41 words
A sewing machine electrical drive device as claimed in claim 1, wherein the said relay contacts function to actuate the said secondary motor upon energization of the said relay and to actuate the said brake unit upon de-energization of the relay.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |