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Patent US4393797A successfully refreshed from Google Patents.
US4393797A
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Arrangement and method for preventing false triggering in an optically switched buttonhole mechanism
Assignee: Retail Holding NV
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Filing: 1982-12-13
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Granted: 1983-07-19
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Expires: 2002-12-13
Abstract
Abstract An optical switching system for one step buttonholing substantially eliminates false triggering when an operator inadvertently moves an object within the viewing path of the optical sensor by utilizing signals from the sensors only when the sewing machine is running.
Inventors
- 👤 Walter H. W. Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:29
CPC Classifications
D; D05; D05B; D05B19/00; D05B19/02; D05B19/12; D05B3/00; D05B3/06; D05D; D05D2205/00; D05D2205/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
In an electronically controlled sewing machine having a controller, a controllable drive motor, and an optical buttonhole mechanism including photosensitive means responsive to changes in the amount of light impinging thereon for providing buttonhole signals adapted to be used by said controller for sequencing through states in the formation of a buttonhole pattern, the improvement comprising: means enabled only during operation of said drive motor for transmitting said buttonhole signals to said controller.
Claim 2
Dependent Claim
73 words
In an electronically controlled sewing machine having a controller, a controllable drive motor, and an optical buttonhole mechanism including photosensitive means responsive to changes in the amount of light impinging thereon for providing buttonhole signals adapted to be used by said controller for sequencing through states in the formation of a buttonhole pattern, the improvement comprising: means enabled only during operation of said drive motor for transmitting said buttonhole signals to said controller.
Claim 3
Dependent Claim
103 words
In an electronically controlled sewing machine having a controller, a controllable drive motor, and an optical buttonhole mechanism including photosensitive means responsive to changes in the amount of light impinging thereon for providing buttonhole signals adapted to be used by said controller for sequencing through states in the formation of a buttonhole pattern, a method for substantially eliminating improper sequencing through said buttonhole states due to inadvertent movement of items in the field of view of said photosensitive means comprising the steps of: determining the operating condition of said drive motor; and utilizing said buttonhole signals only when said drive motor is operating.
Claim 4
Dependent Claim
103 words
In an electronically controlled sewing machine having a controller, a controllable drive motor, and an optical buttonhole mechanism including photosensitive means responsive to changes in the amount of light impinging thereon for providing buttonhole signals adapted to be used by said controller for sequencing through states in the formation of a buttonhole pattern, a method for substantially eliminating improper sequencing through said buttonhole states due to inadvertent movement of items in the field of view of said photosensitive means comprising the steps of: determining the operating condition of said drive motor; and utilizing said buttonhole signals only when said drive motor is operating.
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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |