Patent · US Expired

Buttonhole sewing machine

US6205939A · kind A · utility

1Cited by

5References

7Claims

0Family size

Assignee

Durkopp Adler Aktiengesellschaft · DE

Inventors

Theodor Janocha · Bielefeld, DE
Wolfgang Buchta · Bielefeld, DE
Jorg Bunte · Bielefeld, DE
Karsten Filges · Bielefeld, DE
Klaus Meyer · Kaarst, DE

Key dates

Filing date	Mar 9, 2000
Grant date	Mar 27, 2001
Priority date	—
Expiry date	Mar 9, 2020

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD05B3/06
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A buttonhole sewing machine comprises a needle thread feeding mechanism, in which the needle thread is guided over a cam disk, which performs a rotation during two stitches of the needle. Along its periphery, the cam disk has such a curvature that tensioning and releasing the needle thread complies with the requirements of alternately sewing a single thread chain stitch and a double thread chain stitch during the sewing of a zigzag buttonhole seam.

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