US3669043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewing machine for the formation of a rectangular stitch pattern
Assignee: Individual
•
Filing: 1970-11-04
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Granted: 1972-06-13
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Expires: 1990-11-04
Abstract
Abstract A sewing machine for the formation of an endless stitch pattern has a two-part clamping frame including an outer main frame and an inner clamp member along the closing side of the pattern. Means are provided for horizontally displacing the auxiliary clamp member to clear the stitching line upon closure of the pattern.
Inventors
- 👤 Karl Nicolay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:50
CPC Classifications
D; D05; D05B; D05B5/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
In a sewing machine for stitching a rectangular pattern in a workpiece and having a stitching location, a presser-foot control and a cam-driven workpiece-displacement mechanism, the improvement which comprises, in combination, a main presser foot operatively connected with said mechanism and engageable with an article around three sides of a rectangular pattern to be stitched thereon for shifting the workpiece relative to said location along the configuration of the pattern, an auxiliary presser foot engageable with the workpiece along the fourth side of the pattern and engageable with said main presser foot during the stitching of the pattern prior to stitching of said fourth side, and means operatively connected with said auxiliary presser foot for withdrawing same from said fourth side during the stitching thereof.
Claim 2
Dependent Claim
125 words
In a sewing machine for stitching a rectangular pattern in a workpiece and having a stitching location, a presser-foot control and a cam-driven workpiece-displacement mechanism, the improvement which comprises, in combination, a main presser foot operatively connected with said mechanism and engageable with an article around three sides of a rectangular pattern to be stitched thereon for shifting the workpiece relative to said location along the configuration of the pattern, an auxiliary presser foot engageable with the workpiece along the fourth side of the pattern and engageable with said main presser foot during the stitching of the pattern prior to stitching of said fourth side, and means operatively connected with said auxiliary presser foot for withdrawing same from said fourth side during the stitching thereof.
Claim 3
Dependent Claim
59 words
The improvement defined in claim 1, further comprising releasable detent means for retaining said auxiliary presser foot in engagement with said workpiece during the stitching of said three sides and a release pin engageable with said detent upon conclusion of the stitching of said three sides for withdrawing said auxiliary presser foot during the stitching of said fourth side.
Claim 4
Dependent Claim
19 words
The improvement defined in claim 2 wherein said auxiliary presser foot forms part of a clamp gripping said workpiece.
Claim 5
Dependent Claim
77 words
The improvement defined in claim 3 wherein said main presser foot is provided with a slide having a fabric-receiving plate shiftable relative to said location, a stirrup-shaped arm mounted on said slide remote from said location and having an end overhanging said plate, guide means vertically shiftable on said arm, and a pressure member overlying said plate and mounted on said guide means for clamping said workpiece against said plate along said three sides and outwardly thereof.
Claim 6
Dependent Claim
55 words
The improvement defined in claim 4 wherein said auxiliary presser foot is swingably mounted on said arm and said detent includes at least one bell-crank lever lockingly engageable with said auxiliary presser foot for retaining same in engagement with said workpiece along said fourth side prior to engagement of said pin with said bell-crank lever.
Claim 7
Dependent Claim
99 words
The improvement defined in claim 5, further comprising another bell-crank lever fulcrumed on said arm and provided with a square-head pin, the first-mentioned bell crank lever having a recess engageable with said square-head pin, a torsion spring angularly biasing said first bell-crank lever into engagement with said square-head pin, said release pin being engageable with said first bell-crank lever to swing the same to disengage it from said square-head pin, and a spring angularly biasing said other bell-crank lever in a direction tending to withdraw said auxiliary presser foot from said fourth side against the restraint of said detent.
Claim 8
Dependent Claim
70 words
The improvement defined in claim 6 wherein said presser foot is mounted on a bar articulated to said other bell-crank lever, said improvement further comprising a torsion spring between said bar and said guide means for yieldably coupling said bar with said guide means, and a further torsion spring mounted on said arm and engaging said guide means for urgIng said main presser foot out of engagement with said workpiece.
Claim 9
Dependent Claim
27 words
The improvement defined in claim 7, further comprising a leaf spring mounted on said bar and extending beneath said auxiliary presser foot for forming a clamp therewith.
Claim 10
Dependent Claim
39 words
The improvement defined in claim 8 wherein said presser foot control comprises a vertically shiftable rod and a lever carried by said rod and engaging said guide means for shifting same against the force of said other torsion spring.
Claim 11
Dependent Claim
19 words
The improvement defined in claim 9 wherein said guide means includes a pair of guide plates flanking said arm.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |