Patent US3881433A successfully refreshed from Google Patents.
US3881433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-mechanical actuator
Assignee: Singer Co
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Filing: 1973-04-04
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Granted: 1975-05-06
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Expires: 1993-04-04
Abstract
Abstract A device responsive to electrical control signals for influencing the operation of sewing machine stitch forming instrumentalities to produce predetermined stitch patterns. The device includes a whippletree adder mechanism of which the input arms are selectively influenced by solenoids responsive to the electrical control signals. A mechanical drive is provided from the sewing machine actuating mechanism effective during each stitch for shifting each input arm of the whippletree adder into fully actuated position, in which position the solenoids are selectively energized.
Inventors
- 👤 Donald R Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:10
CPC Classifications
D; D05; D05B; D05B19/00; D05B19/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
188 words
In a sewing machine having a frame, stitch-forming instrumentalities in said frame, and actuating mechanism for imparting stitch-forming movement of said stitch-forming instrumentalities, control linkage in said sewing machine frame operatively associated with said stitch-forming instrumentalities for selectively influencing the production of a variety of patterns of stitches, an electromagnetic locking device comprising a field coil element and an armature element, said elements being free to shift relatively to each other in one predetermined direction when said field coil element is not electrically actuated, and said elements being urged magnetically toward an interlocked relative position when said field coil element is electrically actuated, means for interconnecting said control linkage to one of said electromagnetic locking device elements, means for supporting the other of said electromagnetic locking device elements relatively to said sewing machine frame, mechanism driven in timed relation with said sewing machine actuating mechanism for vibrating one of said electromagnetic device elements in said predetermined direction into and out of said interlocked relative position, and means for selectively energizing said field coil element electrically during each vibration of said electromagnetic device elements into said interlocked relative position.
Claim 2
Dependent Claim
188 words
In a sewing machine having a frame, stitch-forming instrumentalities in said frame, and actuating mechanism for imparting stitch-forming movement of said stitch-forming instrumentalities, control linkage in said sewing machine frame operatively associated with said stitch-forming instrumentalities for selectively influencing the production of a variety of patterns of stitches, an electromagnetic locking device comprising a field coil element and an armature element, said elements being free to shift relatively to each other in one predetermined direction when said field coil element is not electrically actuated, and said elements being urged magnetically toward an interlocked relative position when said field coil element is electrically actuated, means for interconnecting said control linkage to one of said electromagnetic locking device elements, means for supporting the other of said electromagnetic locking device elements relatively to said sewing machine frame, mechanism driven in timed relation with said sewing machine actuating mechanism for vibrating one of said electromagnetic device elements in said predetermined direction into and out of said interlocked relative position, and means for selectively energizing said field coil element electrically during each vibration of said electromagnetic device elements into said interlocked relative position.
Claim 3
Dependent Claim
181 words
A sewing machine having a frame, stitch-forming instrumentalities in said frame, actuating mechanism in said frame for said stitch-forming instrumentalities, and a control device for defining a predetermined pattern in the relative position of successive stitches formed by said stitch-forming instrumentalities, said control device comprising a series of electromagnets, means for selectively transmitting electricity of said electromagnets, a whippletree linkage having an output arm operatively associated with said stitch-forming instrumentalities and including a series of input arms, each input arm arranged to assume alternatively one of two extreme positions, relatively to one of said electromagnets, one of said extreme positions being a fully seated position toward which said input arm will be urged when said electromagnet is energized, and mechanical drive means operated in timed relationship with said sewing machine actuating mechanism for alternately shifting said associated electromagnets and input arms relatively to each other into and out of said fully seated position, and means for selectively transmitting electricity to said electromagnets after shift of said associated electromagnets and input arms into said fully seated position by said mechanical drive means.
Claim 4
Dependent Claim
181 words
A sewing machine having a frame, stitch-forming instrumentalities in said frame, actuating mechanism in said frame for said stitch-forming instrumentalities, and a control device for defining a predetermined pattern in the relative position of successive stitches formed by said stitch-forming instrumentalities, said control device comprising a series of electromagnets, means for selectively transmitting electricity of said electromagnets, a whippletree linkage having an output arm operatively associated with said stitch-forming instrumentalities and including a series of input arms, each input arm arranged to assume alternatively one of two extreme positions, relatively to one of said electromagnets, one of said extreme positions being a fully seated position toward which said input arm will be urged when said electromagnet is energized, and mechanical drive means operated in timed relationship with said sewing machine actuating mechanism for alternately shifting said associated electromagnets and input arms relatively to each other into and out of said fully seated position, and means for selectively transmitting electricity to said electromagnets after shift of said associated electromagnets and input arms into said fully seated position by said mechanical drive means.
Claim 5
Dependent Claim
154 words
In a sewing machine having a frame, stitch-forming instrumentalities in said frame, and actuating mechanism for imparting stitch-forming movements to said stitch-forming instrumentalies, an electromagnetic locking device including a solenoid element and an armature element telescopically arranged within said solenoid element, said elements being interrelated so as to be urged telescopically toward predetermined relative position upon application of electrical acutation to said solenoid element, control linkage in said sewing machine frame operatively associated with said stitch-forming instrumentalities, means for interconnecting said control linkage to one of said electromagnetic locking device elements, means for supporting the other of said electromagnetic locking device elements relatively to said sewing machine frame, mechanism driven by said sewing machine actuating mechanism for mechanically vibrating said electro-mechanical locking device elements telescopically into and out of said predetermined relatiVe position, and means for selectively applying electrical actuation to said solenoid element when said elements are mechanically vibrated into said predetermined position.
Claim 6
Dependent Claim
154 words
In a sewing machine having a frame, stitch-forming instrumentalities in said frame, and actuating mechanism for imparting stitch-forming movements to said stitch-forming instrumentalies, an electromagnetic locking device including a solenoid element and an armature element telescopically arranged within said solenoid element, said elements being interrelated so as to be urged telescopically toward predetermined relative position upon application of electrical acutation to said solenoid element, control linkage in said sewing machine frame operatively associated with said stitch-forming instrumentalities, means for interconnecting said control linkage to one of said electromagnetic locking device elements, means for supporting the other of said electromagnetic locking device elements relatively to said sewing machine frame, mechanism driven by said sewing machine actuating mechanism for mechanically vibrating said electro-mechanical locking device elements telescopically into and out of said predetermined relatiVe position, and means for selectively applying electrical actuation to said solenoid element when said elements are mechanically vibrated into said predetermined position.
Claim 7
Dependent Claim
90 words
In a sewing machine as set forth in claim 3 in which said means for interconnecting said control linkage to one of said electromagnetic locking device elements comprises a pivotal connection of said control linkage to said armature element, in which said solenoid element is fixed relatively to said sewing machine frame, and in which said means for selectively applying electrical actuation of said solenoid element is effective when said armature element is vibrated mechanically by said driven mechanism into a telescoped locked position with respect to said solenoid element.
Claim 8
Dependent Claim
86 words
In a sewing machine as set forth in claim 3 in which said means for interconnecting said control linkage to one of said electromagnetic locking device elements comprises a pivot pin interconnecting said control element with said armature element, in which said mechanism driven by said sewing machine actuating mechanism for mechanically vibrating said electromagnetic locking device element telescopically into and out of said predetermined relative position comprises mechanism for shifting said solenoid element relatively to said sewing machine frame and relatively to said armature element.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |