Patent · US Expired

Sewing machine with workpiece holder for securing initial seam stitches

US4716846A · kind A · utility

7Cited by

10References

10Claims

0Family size

Assignee

PFAFF INDUSTRIES MASCHINEN AG · DE

Inventors

Franz Schneider · Göppingen, DE
Herbert Wenz · Kaiserslautern, DE
Gunter Link · Kaiserslautern, DE

Key dates

Filing date	Oct 29, 1986
Grant date	Jan 5, 1988
Priority date	—
Expiry date	Oct 29, 2006

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD05B29/00
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A sewing machine which is used with manual feed movement of a sewing material has a holding device for the material that is effective during the first phases of stitching of a seam section, by which the first thread knot is held from becoming undone when short thread ends and a large feed movement are used. In a first embodiment, the holding device includes a holding foot, by a drive mechanism in addition to a presser foot which is periodically moved up and down by a drive mechanism, and a controllable drive for the holding foot. In a second embodiment, the holding device includes a presser foot, a compression spring and a decoupling mechanism by which the presser foot can be disconnected from its drive mechanism.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.