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US3847101A Expired / Lapsed US ⏱️ 0.0 years remaining

Sewing machine having thread severing device

Assignee: Individual
•
Filing: 1973-12-20
•
Granted: 1974-11-12
•
Expires: 1993-12-20
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Abstract

Abstract A sewing machine comprises a machine frame having a workpiece support and a bracket which is pivotally mounted on the frame for pivotal upward movement to a rest position and downward movement to an operative position. The machine includes a rotatable shuttle mounted on the bracket in a position overlying a needle which is mounted for reciprocation upwardly and downwardly in the frame below the shuttle. A clamping arm is pivoted on the frame below the bracket and includes a portion which is engageable with a cutting mechanism carried on a pressure plate which is supported on the bracket. Movement of the bracket causes movement of the clamping arm to actuate the cutting mechanism to sever the thread. The cutting mechanism is carried on a pressure plate which is suspended on a rod having a pin portion which is confined for movement in a vertical slot carried on a holder mounted on the bracket. The upward movement of the bracket initially causes a displacement of the shuttle away from the workpiece so that the thread is drawn upwardly and a further movement causes movement of the clamping arm to actuate the cutting mechanism to sever the thread after the pressure plate lifts off the workpiece which is supported on the frame.

Inventors

  • 👤 G Tolle

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 02:13
CPC Classifications
D; D05; D05B; D05B73/00; D05B73/02; D05B65/00; D05B3/00; D05B3/06

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 121 words
A sewing machine comprising a machine frame having a workpiece support, a bracket mounted on said frame for pivotal movement upwardly to a rest position and downwardly to an operative position, a needle mounted on said frame for upward and downward reciprocation below said support, a rotatable shuttle mounted on said bracket overlying said needle for cooperative engagement therewith, a clamping arm connected to said bracket for movement therewith and pivoted on said frame over said support and having an end adapted to clamp the workpiece on the support, a thread cutter carried by said bracket and connected to said clamping arm, said clamping arm being movable by upward movement of said bracket to actuate said cutter to sever the thread.
Claim 2
Dependent Claim 121 words
A sewing machine comprising a machine frame having a workpiece support, a bracket mounted on said frame for pivotal movement upwardly to a rest position and downwardly to an operative position, a needle mounted on said frame for upward and downward reciprocation below said support, a rotatable shuttle mounted on said bracket overlying said needle for cooperative engagement therewith, a clamping arm connected to said bracket for movement therewith and pivoted on said frame over said support and having an end adapted to clamp the workpiece on the support, a thread cutter carried by said bracket and connected to said clamping arm, said clamping arm being movable by upward movement of said bracket to actuate said cutter to sever the thread.
Claim 3
Dependent Claim 47 words
A sewing machine, according to claim 1, wherein said cutter comprises a cutter lever mechanism, a pressure plate supported on said racket, said lever mechanism bEing pivoted on said pressure plate and being connected to said clamping arm and being pivotal thereby to effect the cutting operation.
Claim 4
Dependent Claim 84 words
A sewing machine, according to claim 1, including a press plate, a vertically movable member carrying said press plate and having a pin portion, a guide carried on said bracket in which said member is movable upwardly and downwardly and including a slot in which said pin portion is engageable and confined for movement within defined limits of said slot, and spring means urging said pressure plate downwardly away from said bracket, said pressure plate being engageable with the workpiece and carrying said cutter.
Claim 5
Dependent Claim 83 words
A sewing machine, according to claim 3, wherein the connection between said clamping arm and said bracket includes a crank pivotally mounted on said clamping arm and having an end pivotally connected to an actuating member connected to said cutter, said crank having a pawl engagement surface, and a ratchet lever pivoted on said bracket and engageable with said pawl to rotate said crank to move said actuating member to actuate said cutter when said bracket is moved upwardly by a predetermined amount.
Claim 6
Dependent Claim 39 words
A sewing machine, according to claim 4, wherein said cutter is connected by four-bar linkage comprising said actuating member, said crank with said pawl, and said cutter, said cutter including a pivotal lever portion included in said four-bar linkage.
Claim 7
Dependent Claim 36 words
A sewing machine, according to claim 4, including a bridge pivotally mounted on said bracket, said ratchet lever being pivoted on said bridge and adjustment means connected to said bridge for adjusting in the position thereof.

References Cited (Backward Citations)

US2499335A Cited
US2509619A Cited
US3512491A Cited
US3749041A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-11-11 1978-05-13 1978-11-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-11-11 1982-05-13 1982-11-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-11-11 1986-05-13 1986-11-12 $7700.00 Window Closed / Lapsed

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