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:
Jul. 20, 1976
Filed:
Apr. 19, 1974
Nereo Bianchi, Pavia, IT;
Necchi S.p.A., Pavia, IT;
Abstract
A sewing threads trimming device for sewing machines provided with a blade adapted to make, at the end of a sewing operation and in a suitable timing relation with the hook and needle movements, a first displacement over the hook during which a thread loop closes over the blade and thereafter a second movement in the opposite direction to bring the sewing threads into contact with a counterblade and cut them, including a cam of magnetizable material deriving its motion from the sewing machine main shaft and having a portion of little thickness and an arc-shaped front contour and a second portion diametrically opposed to the first having a particular contour to impart prescribed motion to the threads trimming blade and a cam follower comprised of a U-shaped member closed by a cylindrical portion adapted to couple with the cam and connected to a blade carrying shaft through a plate and crank mechanism. The cam follower is a member of a magnetic circuit energizable by a coil linked thereto to obtain coupling through magnetic attraction between the cam follower and the cam.