Needle position detecting arrangement for sewing machines

Details Needle position detecting arrangement for sewing machines Needle position detecting arrangement for sewing machines

H - Electricity

01

H

340/135.6

H01H 35/00 (2006.01) D05B 69/24 (2006.01)

Patent

CA 1046151

ABSTRACT OF THE DISCLOSURE The invention relates to a needle position detecting arrangement for sewing machines. Sewing machines include a hous- ing, a main shaft rotatably mounted in the housing, a needle con- nected to the main shaft and vertically reciprocated thereby and a rotary member fixedly mounted on the main shaft. In accordance with the invention, a Hall generator is secured to a part of the housing. A magnet is secured to a face of the rotary member fac- ing the Hall generator, and a clearance is provided between the magnet and the generator. Each time the magnet passes the gen- erator, a voltage is produced. This voltage is fed to a control circuit which detects the position of the needle. Hall generators may be fixed in two parts of the housing to detect two positions of the needle.

170713

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