Patent US3745946A successfully refreshed from Google Patents.
US3745946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic apparatus for making welted pockets
Assignee: Necchi SpA
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Filing: 1972-05-22
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Granted: 1973-07-17
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Expires: 1992-05-22
Abstract
Abstract Automatic apparatus for making welted pockets comprising a sewing unit, a work plate slidable along a longitudinal axis, a presser work clamp integral with the work plate to which a piece of fabric is fastened, a center blade and two side pressers for clamping a piece of patch fabric onto the main piece of fabric after folding it according to a determined shape, and a lever system including a lever arm having an adjustable effective length for dirving the strokes of said pressers in order to vary the width of the strokes.
Inventors
- 👤 N Bianchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:52
CPC Classifications
D; D05; D05B; D05B3/00; D05B3/10; D05D; D05D2207/00; D05D2207/02; D05D2303/00; D05D2303/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
Apparatus for making welted pockets on a sewing machine, comprising: a work plate mounted on the base plate of said machine and slidable along a longitudinal axis; a presser work clamp connected to said work plate for movement therewith; first and second side pressers mounted on said machine for folding and clamping a piece of patch fabric to a piece of main fabric clamped to the machine by said work clamp; lever means connected to said pressers for moving said pressers into and out of a clamping position, said lever means including a lever arm having an adjustable effective length, wherein the width of the presser stroke is proportional to the length of said lever arm; and a center blade connected to said lever means and movable into and out of a position for cutting said fabric in conjunction with the movement of said side pressers.
Claim 2
Dependent Claim
146 words
Apparatus for making welted pockets on a sewing machine, comprising: a work plate mounted on the base plate of said machine and slidable along a longitudinal axis; a presser work clamp connected to said work plate for movement therewith; first and second side pressers mounted on said machine for folding and clamping a piece of patch fabric to a piece of main fabric clamped to the machine by said work clamp; lever means connected to said pressers for moving said pressers into and out of a clamping position, said lever means including a lever arm having an adjustable effective length, wherein the width of the presser stroke is proportional to the length of said lever arm; and a center blade connected to said lever means and movable into and out of a position for cutting said fabric in conjunction with the movement of said side pressers.
Claim 3
Dependent Claim
80 words
Apparatus according to claim 1, wherein said lever means comprises: a first arm having a fixed length connected with a pneumatic motor; two parallel arms each having an arcuate slot formed therein; pins adjustably mounted in said slots; ball joints connected to said pins; rods connected to said side pressers; and means connecting said ball joints to said rods, wherein movement of said ball joints drives said rods to move said side pressers into and out of said clamping position.
Claim 4
Dependent Claim
41 words
Apparatus according to claim 2, further comprising: hub members connected to said side pressers for movement together with said work plate; and second lever means connecting said hub members and said rods, said second lever means being operated by said rods.
Claim 5
Dependent Claim
39 words
Apparatus according to claim 3, further comprising: two parallel shafts connecTed to said second lever means; wherein said hubs have U-shaped grooves formed therein for seating said parallel shafts, said shafts forming guides for the movement of said hubs.
References Cited (Backward Citations)
US2573359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |