US3749040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thread-chain cutting device for sewing machines with means for adjusting length of thread remaining on work
Assignee: Union Special GmbH
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Filing: 1971-04-26
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Granted: 1973-07-31
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Expires: 1991-04-26
Abstract
Abstract Thread chain cutting mechanism for sewing machines which includes adjustable means for predetermining the length of thread, chained or not, which is to be left extending from the work after operation of the cutting blades. In one embodiment a fabric guide having a generally horizontally disposed fabric guiding surface is provided with a thread chain inlet opening and is secured for vertical adjustment upon the tube which carries away the cuttings and on which a fixed knife blade is mounted. In another embodiment either or both the tube and the fabric guide is mounted on a frame part of the machine for relative vertical adjustment.
Inventors
- 👤 E Jurgens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:49
CPC Classifications
D; D05; D05B; D05B65/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
240 words
A thread chain severing device for a sewing machine having stitch-forming means including a throat plate, comprising a pair of knife blades having relatively movable cutting edges, pneumatic means for placing a thread chain attached to a work piece between said edges of said knife blades, a fabric guide having a fabric supporting surface extending generally from said stitch-forming means and lying above said pair of knife blades, a tube for guiding cuttings away from said pair of knife blades, one of said pair of knife blades being fixed upon said tube, said fabric supporting surface of said fabric guide being provided with an inlet opening to receive the thread chain and guide it into said tube and between said edges of said pair of knife blades, said tube and said fabric guide each being secured to a frame part of said sewing machine by adjustable means which provide for selection of the level of said cutting edges of said knife blades and of said fabric supporting surface of said fabric guide, respectively, relative to the level of said throat plate of said stitch forming means, and said adjustable means also providing for adjustable fixing of the distance from said fabric supporting surface of said fabric guide to said cutting edges of said knife blades whereby to selectively predetermine the length of thread chain which will remain attached to said work piece after the severing operation of said knife blades.
Claim 2
Dependent Claim
240 words
A thread chain severing device for a sewing machine having stitch-forming means including a throat plate, comprising a pair of knife blades having relatively movable cutting edges, pneumatic means for placing a thread chain attached to a work piece between said edges of said knife blades, a fabric guide having a fabric supporting surface extending generally from said stitch-forming means and lying above said pair of knife blades, a tube for guiding cuttings away from said pair of knife blades, one of said pair of knife blades being fixed upon said tube, said fabric supporting surface of said fabric guide being provided with an inlet opening to receive the thread chain and guide it into said tube and between said edges of said pair of knife blades, said tube and said fabric guide each being secured to a frame part of said sewing machine by adjustable means which provide for selection of the level of said cutting edges of said knife blades and of said fabric supporting surface of said fabric guide, respectively, relative to the level of said throat plate of said stitch forming means, and said adjustable means also providing for adjustable fixing of the distance from said fabric supporting surface of said fabric guide to said cutting edges of said knife blades whereby to selectively predetermine the length of thread chain which will remain attached to said work piece after the severing operation of said knife blades.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |