US3672315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic actuating mechanism
Assignee: USM Corp
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Filing: 1970-08-03
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Granted: 1972-06-27
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Expires: 1990-08-03
Abstract
Abstract Fluidic mechanism is responsive to an event, for instance a contingency such as thread breakage in a sewing machine, to operate a control member whereby a clutch is actuated, for instance to disconnect a drive motor from the sewing machine. A transducer preferably in the form of a contractile bag is employed in the surveillant fluidic control circuit.
Inventors
- 👤 Adelbert W Rockwell Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:04
CPC Classifications
D; D05; D05B; D05B51/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
137 words
In a sewing machine having a motor driven needle, a clutch shiftable between engaged and disengaged positions controlling the drive of the needle, means for supplying thread under tension to the needle, and fluid pressure controlled mechanism responsive to loss of thread tension for automatically shifting said clutch to disengaged position, said mechanism comprising a valve actuatable in response to change in the thread tension, the valve having a rotatable hub disposed adjacent to an air vent, a transducer responsive to operation of the valve, and linkage including a latching lever operatively interconnected between the transducer and the clutch, the arrangement being such that the valve hub has a flat portion disposed normally to allow passage of air from the vent and another portion disposed to impede such air passage upon a change in the thread tension.
Claim 2
Dependent Claim
137 words
In a sewing machine having a motor driven needle, a clutch shiftable between engaged and disengaged positions controlling the drive of the needle, means for supplying thread under tension to the needle, and fluid pressure controlled mechanism responsive to loss of thread tension for automatically shifting said clutch to disengaged position, said mechanism comprising a valve actuatable in response to change in the thread tension, the valve having a rotatable hub disposed adjacent to an air vent, a transducer responsive to operation of the valve, and linkage including a latching lever operatively interconnected between the transducer and the clutch, the arrangement being such that the valve hub has a flat portion disposed normally to allow passage of air from the vent and another portion disposed to impede such air passage upon a change in the thread tension.
Claim 3
Dependent Claim
48 words
A sewing machine as set forth in claim 1 wherein said valve hub is formed on a pivotal lever, and a portion of the lever is disposed to rest on the thread, under the influence of gravity, between two thread contacting localities over which the thread progressively passes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |