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:
Nov. 16, 1976
Filed:
Sep. 18, 1975
Reinhold Papajewski, Buchig, DT;
Heinz Emil Walter, Blankeloch, DT;
The Singer Company, New York, NY (US);
Abstract
A bobbin thread depletion signal for lock stitch sewing machines or the like. The bobbin, which is constructed so that one of the end flanges is free to slide axially along the hub, is horizontally mounted in the machine bobbin carrier. When thread is wound on the bobbin, the slideable flange is forced outward against a stop and is positioned in the field of an electronic sensor, such as an oscillator coil, the inductance of which is altered by a proximity of the slideable flange. When the thread is removed from the hub, the slideable end flange will drop from the environment of the sensor toward the stationary flange thereby producing an inductance change that is detected by electronic sensor circuitry that signals the sewing machine operator.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile