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:
Dec. 02, 1997
Filed:
Sep. 24, 1996
Rudy Papajewski, Stutensee, DE;
Gerd Papajewski, Stutensee, DE;
AMF Reece, Inc., Mechanicsville, VA (US);
Abstract
A grooved barrel cam is mounted on a needle bar drive shaft. As the last step, after stitching is completed and power is removed, an engaging arm inserts a follower pin into the cam. A knife cam follower lever drives a knife drive shaft and a knife driving lever. The knife driving lever drives a knife holder downward. A connector at a middle of the knife holder maintains the holder vertical. A knife is secured at the bottom of the knife holder. The cam and a tension spring angularly return the cam follower lever, the shaft and the knife lever and lift the holder, when the cut has been completed. A compression spring around the knife drive shaft moves the follower away from the cam once the engaging arm has released the follower. Engaging the knife cam follower and operating the knife driving mechanism on the last revolution after the clutch is released helps exhaust the kinetic energy of the sewing machine before bringing the machine to a stop.