Patent · US Expired

Buttonhole sewing machine

US6684798B2 · kind B2 · utility

0Cited by

4References

7Claims

0Family size

Assignee

Dürkopp Adler AG · DE

Inventors

Karsten Filges · Bielefeld, DE
Theodor Janocha · Bielefeld, DE
Jochen Fischer · Whitehall, US

Key dates

Filing date	May 28, 2003
Grant date	Feb 3, 2004
Priority date	—
Expiry date	May 28, 2023

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T83/18
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A buttonhole sewing machine comprises a buttonhole cutting device which includes a knife and at least one cutting block that cooperates with the knife. Provision is made for a cutting drive for motion of the knife and the cutting block relative to each other by variable cutting force, the cutting drive comprising several linear drives which are connected in parallel and pneumatically actuated selectively.

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