Apparatus for stretch-sewing a hem in tubular fabric
US4098204A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1976 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | Jul 6, 1996 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05D2305/04
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A tubular workpiece is fed toward a stitch forming means while forcing the marginal edge portion of the workpiece upwardly against an annular peripheral portion of a rotatable guide plate and then across an upper flat surface of the guide plate. This action automatically forms a substantially Z-shaped fold in the marginal portion of the workpiece. This fold is both interiorly and exteriorly guided so that the fold is formed into a triple-thickness hem which is thereafter sewn by the stitch former. The edge of the marginal portion of the workpiece is maintained in a predetermined alignment with respect to the direction of feed of the workpiece by rotating the guide plate in either the clockwise or counterclockwise directions. When the initial portion of the sewn hem of the tubular workpiece returns to a position adjacent the guide plate, the marginal portion of the workpiece is no longer forced against the annular peripheral surface of the guide plate, and also the interior guiding of the fold is discontinued, thereby preventing jamming of the initial sewn hem portion. A predetermined time after the detection of the initial sewn hem portion, the exterior guiding of the fold is stopp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.