Sewing – Elements – Attachment holders
Patent
1974-04-19
1976-07-20
Hunter, H. Hampton
Sewing
Elements
Attachment holders
D05b 6502
Patent
active
039700208
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.
REFERENCES:
patent: 1292784 (1919-01-01), Hughes
patent: 3216380 (1965-11-01), Bono
patent: 3276405 (1966-10-01), Scholl
patent: 3605664 (1971-09-01), Hedegaard
patent: 3776161 (1973-12-01), Papagewski et al.
Hunter H. Hampton
Necchi S.p.A.
LandOfFree
Sewing threads trimming device for sewing machines does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sewing threads trimming device for sewing machines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sewing threads trimming device for sewing machines will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-550742