The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 22, 1988
Filed:
Jun. 03, 1986
Applicant:
Inventors:
Bernhard Mertel, Kaiserslautern, DE;
Erich Willenbacher, Kaiserslautern, DE;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D05B / ; D05B / ;
U.S. Cl.
CPC ...
112278 ; 112231 ; 112273 ;
Abstract
A sewing machine with a lockstitch rotary hook containing a bobbin, has a thread monitor with which light signals of a radiation source are conducted to a light receiver via inlet and outlet openings in parts of the rotary hook and in at least one of the flanges of the bobbin. For determination of a predeterminable thread and length, the hub which connects the flanges of the bobbin comprises a truncated cone-shaped region, in the surface of which the outlet opening extending substantially parallel to the axis of the hub ends.