US4258639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Workpiece advancing apparatus for sewing machines
Assignee: Rockwell-Rimoldi SpA
•
Filing: 1979-04-23
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Granted: 1981-03-31
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Expires: 1999-04-23
Abstract
Abstract A device for supporting and guiding a folded workpiece to the stitching needle of a sewing machine by advancing the same between a pair of cylindrical members mounted on the machine for rotation in opposite directions. Each of the cylindrical members is provided with circumferential grooves on their peripheral surfaces with the grooves of each being in general alignment with those of the other. The configuration of the grooves in combination with the spacing between the cylindrical members causes the folded workpiece being advanced therebetween, to become deformed to the extent where portions thereof enter the grooves to effectively support its weight while accurately guiding it along the level of its intended path of travel.
Inventors
- 👤 Pietro Bonalumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:30
CPC Classifications
D; D05; D05B; D05B27/00; D05B27/10; D05B27/18; D05D; D05D2303/00; D05D2303/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
An improved device for advancing a folded workpiece to the stitching needle in a sewing machine of the type for applying a seam of safety overlock stitches along a line bonding two faced portions of elastic material forming the workpiece, the improvement comprising: (a) a pair of spaced cylindrical members (2,4) mounted for rotation in opposite directions on the machine in operative association with the stitching needle for advancing the workpiece through the stitching zone; (b) means formed on the peripheral surface of each said cylindrical members for guiding the workpiece as it is advanced therebetween and for supporting the weight thereof defining: (i) spaced and parallel circumferential grooves (12) extending in a plane parallel to the direction of workpiece advancement in each of said cylindrical members for receiving portions of the workpiece deformed by the cylindrical members as it is advanced therebetween.
Claim 2
Dependent Claim
143 words
An improved device for advancing a folded workpiece to the stitching needle in a sewing machine of the type for applying a seam of safety overlock stitches along a line bonding two faced portions of elastic material forming the workpiece, the improvement comprising: (a) a pair of spaced cylindrical members (2,4) mounted for rotation in opposite directions on the machine in operative association with the stitching needle for advancing the workpiece through the stitching zone; (b) means formed on the peripheral surface of each said cylindrical members for guiding the workpiece as it is advanced therebetween and for supporting the weight thereof defining: (i) spaced and parallel circumferential grooves (12) extending in a plane parallel to the direction of workpiece advancement in each of said cylindrical members for receiving portions of the workpiece deformed by the cylindrical members as it is advanced therebetween.
Claim 3
Dependent Claim
55 words
The improved device according to claim 1 wherein said circumferential grooves (12) have a cross-sectional configuration substantially that of an open right-angled triangle with the hypotenuse (14) thereof inclined upwardly and toward the other cylindrical member and with the base portion (15) extending in a plane orthogonal to the peripheral surface of said cylindrical members.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |