US3851605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewing machine cutting mechanism
Assignee: Jetsew Inc
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Filing: 1973-07-30
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Granted: 1974-12-03
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Expires: 1993-07-30
Abstract
Abstract A sewing machine having a cutting mechanism, an override control mechanism operable for positively controlling the advance of material past the cutting mechanism, and sensing means for sensing the presence of material upstream of the cutting mechanism for actuating the override control mechanism to effect automatic feeding of material past the cutting mechanism in synchronism with the operation of the cutting mechanism.
Inventors
- 👤 J Rockerath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:19
CPC Classifications
D; D05; D05B; D05B37/00; D05B37/04; D05D; D05D2207/00; D05D2207/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
207 words
In a sewing machine having a cutting station in a feed path of material to be sewed, a cutting mechanism comprising a frame including a knife carrier mounted thereon for reciprocating movement laterally toward and away from the feed path respectively between a normal extended position and a retracted inoperative position, a knife support having a vertical pivot shaft rotatably supported on the carrier, a scissors-type knife including a movable blade operatively mounted on the knife support for movement about a generally horizontal pivot axis and a fixed blade secured to the knife support, the fixed and movable blades being supported for swinging movement with the knife support about its vertical pivot shaft for varying the angle of the knife relative to the material for a cutting operation, and knife positioning means for angularly rotating the knife support about its vertical pivot shaft and positioning it in a selected angular position to the feed path of the material for a cutting operation, the fixed blade of the knife being of sufficient length that the fixed blade remains in lapping relation to the feed path of the material throughout the operating cycle of the knife carrier during its reciprocating movement between said normal extended and retracted inoperative positions.
Claim 2
Dependent Claim
207 words
In a sewing machine having a cutting station in a feed path of material to be sewed, a cutting mechanism comprising a frame including a knife carrier mounted thereon for reciprocating movement laterally toward and away from the feed path respectively between a normal extended position and a retracted inoperative position, a knife support having a vertical pivot shaft rotatably supported on the carrier, a scissors-type knife including a movable blade operatively mounted on the knife support for movement about a generally horizontal pivot axis and a fixed blade secured to the knife support, the fixed and movable blades being supported for swinging movement with the knife support about its vertical pivot shaft for varying the angle of the knife relative to the material for a cutting operation, and knife positioning means for angularly rotating the knife support about its vertical pivot shaft and positioning it in a selected angular position to the feed path of the material for a cutting operation, the fixed blade of the knife being of sufficient length that the fixed blade remains in lapping relation to the feed path of the material throughout the operating cycle of the knife carrier during its reciprocating movement between said normal extended and retracted inoperative positions.
Claim 3
Dependent Claim
59 words
The cutting mechanism of claim 1 wherein the movable blade terminates in a free swinging end which upon being closed on the fixed blade is generally aligned with the vertical pivot shaft of the knife support to permit uniform depth of cut of the material irrespective of the angle of the knife relative to the feed path of material.
Claim 4
Dependent Claim
136 words
In a sewing machine having a cutting station in a feed path of material to be sewed, a cutting mechanism comprising a frame including a knife carrier mounted thereon for reciprocating movement laterally toward and away from the feed path respectively between a normal extended position and a retracted inoperative position, a scissors-type knife supported on the knife carrier, the knife including a movable blade operatively mounted on the knife carrier for movement about a generally horizontal pivot axis and a fixed blade supported in fixed relation to the knife carrier, the fixed blade of the knife being of sufficient length that the fixed blade remains in lapping relation to the feed path of the material throughout the operating cycle of the knife carrier during its reciprocating movement between said normal extended and retracted inoperative positions.
Claim 5
Dependent Claim
136 words
In a sewing machine having a cutting station in a feed path of material to be sewed, a cutting mechanism comprising a frame including a knife carrier mounted thereon for reciprocating movement laterally toward and away from the feed path respectively between a normal extended position and a retracted inoperative position, a scissors-type knife supported on the knife carrier, the knife including a movable blade operatively mounted on the knife carrier for movement about a generally horizontal pivot axis and a fixed blade supported in fixed relation to the knife carrier, the fixed blade of the knife being of sufficient length that the fixed blade remains in lapping relation to the feed path of the material throughout the operating cycle of the knife carrier during its reciprocating movement between said normal extended and retracted inoperative positions.
Claim 6
Dependent Claim
49 words
The cutting mechanism of claim 3 wherein the fixed blade of the knife is disposed in a plane parallel to but below a plane containing the feed path of material and remains in underlying lapping relatioN thereto throughout the operating cycle of the knife carrier during its reciprocating movement.
Claim 7
Dependent Claim
81 words
The cutting mechanism of claim 3 further including a pivotable knife support having a vertical pivot shaft rotatably supported on the knife carrier, wherein the knife is mounted on the knife support with the fixed blade of the knife secured to the knife support, the fixed and movable knife blades being supported for swinging movement in unison with the knife support about its vertical pivot shaft for varying the angle of the knife relative to the material for a cutting operation.
Claim 8
Dependent Claim
62 words
The cutting mechanism of claim 5 wherein the movable knife blade terminates in a free swinging end which upon being closed on the fixed knife blade is generally aligned with the vertical pivot shaft of the knife support to permit uniform depth of the cut of the material irrespective of the angle of the knife relative to the feed path of material.
Claim 9
Dependent Claim
41 words
The cutting mechanism of claim 5 further including knife positioning means for angularly rotating the knife support about its vertical pivot shaft and positioning it in a selected angular position to the feed path of the material for a cutting operation.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |