Patent US3683294A successfully refreshed from Google Patents.
US3683294A
Expired / Lapsed
US
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Contactless synchronizer, particularly for sewing machines
Assignee: Frankl and Kirchner GmbH and Co KG
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Filing: 1970-02-13
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Granted: 1972-08-08
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Expires: 1990-02-13
Abstract
Abstract Synchronizer without contacts, particularly for sewing machines, utilizes a unitary assembly of rotating position indicators for reducing flux changes in a common field and a transistorized oscillating circuit for converting the flux changes into separate signals for different control functions.
Inventors
- 👤 Hans Gaa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:07
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/22; D05B69/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
In a synchronizer having two rotatable position indicators for different control functions, the combination of a rotary shaft supporting said indicators coaxially in laterally spaced and rotatably adjustable relation to each other, energy flux producing means fixedly positioned at the axially outer sides, respectively of said position indicators, said indicators being operable upon rotation thereof to control passage of said energy flux therethrough, sensing means fixedly positioned intermediate, said indicators and responsive to said passage of said energy flux through said indicators; and an electrical circuit controlled by said sensing means to produce signal outputs in response to rotation of said position indicators, said energy flux producing means being magnetic coils and said position indicators being magnetic shield disks having radial slots, respectively, for the passage of magnetic flux from said coils through said disks to said sensing means.
Claim 2
Dependent Claim
139 words
In a synchronizer having two rotatable position indicators for different control functions, the combination of a rotary shaft supporting said indicators coaxially in laterally spaced and rotatably adjustable relation to each other, energy flux producing means fixedly positioned at the axially outer sides, respectively of said position indicators, said indicators being operable upon rotation thereof to control passage of said energy flux therethrough, sensing means fixedly positioned intermediate, said indicators and responsive to said passage of said energy flux through said indicators; and an electrical circuit controlled by said sensing means to produce signal outputs in response to rotation of said position indicators, said energy flux producing means being magnetic coils and said position indicators being magnetic shield disks having radial slots, respectively, for the passage of magnetic flux from said coils through said disks to said sensing means.
Claim 3
Dependent Claim
28 words
A synchronizer in accordance with claim 1, where said magnetic coils are components of an oscillator circuit having a feedback field in which said magnetic shield disks rotate.
Claim 4
Dependent Claim
16 words
A synchronizer in accordance with claim 2, where said slots are displaced relative to one another.
Claim 5
Dependent Claim
13 words
Synchronizer in accordance with claim 3, where said oscillator circuit includes a transistor.
Claim 6
Dependent Claim
24 words
Synchronizer in accordance with claim 4, where said oscillator circuit includes a potential divider provided with a first hot conductor constituting a temperature compensator.
Claim 7
Dependent Claim
32 words
Synchronizer in accordance with claim 5, including a capacitive circuit branch serving as a high frequency bridge for a plurality of potential dividers and including a second hot conductor for temperature compensation.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |