Patent · US Expired

Device for optically scanning the material being sewn in a sewing machine

US5271345A · kind A · utility

10Cited by

4References

20Claims

0Family size

Assignee

G.M. Pfaff Aktiengesellschaft · DE

Inventors

Bernd Matschulat · Spaichingen, DE
Robert Massen · Schallstadt, DE
Bernhard Mertel · Enkenbach-Alsenborn, DE

Key dates

Filing date	Jan 17, 1992
Grant date	Dec 21, 1993
Priority date	—
Expiry date	Jan 17, 2012

Classification

Technology area (CPC G)Physics
CPC primaryG01B11/14
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

To scan the material being sewn (30, 31) in a sewing machine in an annular area around the presser foot, an annular lens system (25) is provided, which images a circle (33) concentrically surrounding the presser foot in the plane (A) of the material being sewn onto the light inlet ends of a likewise annularly arranged plurality of optical fibers (26). The optical fibers (26) lead, in an individual assignment, to the individual light-receiving elements of a photoelectric sensor line of a line camera, which sensor line can be read cyclically.

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