Needle position detecting arrangement for sewing machines
CA 1046151 A · Owner: Janome Sewing Machine Co. · Inventors: Makabe, Hachiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a needle position detecting arrangement for sewing machines. Sewing machines include a housing, 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 facing the Hall generator, and a clearance is provided between the magnet and the generator. Each time the magnet passes the generator, a voltage is produced. This voltage is fed to a control circuit which detects the position of the needle. Hall generators may …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 9, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 9, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.