Patent US3972297A successfully refreshed from Google Patents.
US3972297A
Expired / Lapsed
US
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Sewing machine position and speed sensing system
Assignee: Union Special Corp
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Filing: 1975-01-27
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Granted: 1976-08-03
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Expires: 1995-01-27
Abstract
Abstract Logic circuit device and frequency voltage converter connected to the impulse preparation device. A gate being interposed between voltage converter and the impulse preparation device. Comparator connected to the converter which compares its output to an adjustable reference voltage.
Inventors
- 👤 Juergen Melcharick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:50
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/22; D05B69/24; B; B23; B23Q; B23Q15/00; B23Q15/20; B23Q15/22; B23Q15/26; G; G05; G05B; G05B2219/00; G05B2219/20; G05B2219/25; G05B2219/25045; G05B2219/25405
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
199 words
A device for sensing the speed and angular position of a sewing machine main shaft comprising: multiple impulse transmitter means mounted on said shaft for rotation therewith and including a series of circumferentially spaced poles, transmitting a series of impulses during one revolution thereof and at least one non-polarized area means producing more than one successively identical impulse relative to a predetermined angular position of said shaft; Hall generator means associating with said multiple impulse transmitter means for determining polarities of said impulses; impulse preparation means for receiving impulses from said Hall generator means; logic circuitry means connected with said impulse preparation means for receiving impulses therefrom and for generating a signal at the angular position of said shaft when more than one successively identical impulse is produced whereby sensing the position of said shaft; gate means connected to and receiving output from said impulse preparation means; frequency voltage converter means receiving output from said gate means and producing a voltage which is proportional to the number of impulses produced per unit of time; and comparator means receiving current from said frequency voltage converter means comparing said voltage with a preset voltage whereby sensing the speed of said shaft.
Claim 2
Independent Claim
199 words
A device for sensing the speed and angular position of a sewing machine main shaft comprising: multiple impulse transmitter means mounted on said shaft for rotation therewith and including a series of circumferentially spaced poles, transmitting a series of impulses during one revolution thereof and at least one non-polarized area means producing more than one successively identical impulse relative to a predetermined angular position of said shaft; Hall generator means associating with said multiple impulse transmitter means for determining polarities of said impulses; impulse preparation means for receiving impulses from said Hall generator means; logic circuitry means connected with said impulse preparation means for receiving impulses therefrom and for generating a signal at the angular position of said shaft when more than one successively identical impulse is produced whereby sensing the position of said shaft; gate means connected to and receiving output from said impulse preparation means; frequency voltage converter means receiving output from said gate means and producing a voltage which is proportional to the number of impulses produced per unit of time; and comparator means receiving current from said frequency voltage converter means comparing said voltage with a preset voltage whereby sensing the speed of said shaft.
Claim 3
Independent Claim
133 words
A device for sensing angular position of a sewing machine main shaft comprising: multiple impulse transmitter means mounted on said shaft for rotation therewith and including a series of circumferentially spaced poles, transmitting a series of impulses during one revolution thereof and at least one non-polarized area means producing more than one successively identical impulses relative to a predetermined angular position of said shaft; Hall generator means associating with said multiple impulse transmitter means for determining polarities of said impulses; impulse preparation means for receiving impulses from said Hall generator means; and logic circuitry means connected with said impulse preparation means for receiving impulses therefrom and for generating a signal at the angular position of said shaft when more than one successively identical impulse is produced whereby sensing the position of said shaft.
Claim 4
Independent Claim
133 words
A device for sensing angular position of a sewing machine main shaft comprising: multiple impulse transmitter means mounted on said shaft for rotation therewith and including a series of circumferentially spaced poles, transmitting a series of impulses during one revolution thereof and at least one non-polarized area means producing more than one successively identical impulses relative to a predetermined angular position of said shaft; Hall generator means associating with said multiple impulse transmitter means for determining polarities of said impulses; impulse preparation means for receiving impulses from said Hall generator means; and logic circuitry means connected with said impulse preparation means for receiving impulses therefrom and for generating a signal at the angular position of said shaft when more than one successively identical impulse is produced whereby sensing the position of said shaft.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |