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:
Aug. 25, 1992
Filed:
Sep. 07, 1990
Applicant:
Inventors:
Stephen L Bellio, West Roxbury, MA (US);
Richard K Arauo, Tewskbury, MA (US);
Assignee:
The Charles Stark Draper Laboratory, Inc., Cambridge, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D05B / ;
U.S. Cl.
CPC ...
112278 ;
Abstract
Apparatus for detecting skipped stitches for sewing machines having a bobbin-type assembly using a thread movement sensor for continuous monitoring of the presence of a needle thread in a beam path. Needle thread movement is correlated with needle shaft rotation per stitch cycle to detect instances when there is no thread movement during a stitch cycle. The apparatus may also include a bobbin thread monitor system to detect residual bobbin thread.