Electricity: motive power systems – Three-or-more-positions motor controller systems – Knee- or foot-operated controllers
Patent
1992-03-04
1993-08-03
Ro, Bentsu
Electricity: motive power systems
Three-or-more-positions motor controller systems
Knee- or foot-operated controllers
388933, 112277, 318480, H02P 700, D05B 6918
Patent
active
052332772
ABSTRACT:
The electric motor and the needle locating device of a sewing machine are adjusted by a pivotable treadle controlling a radiation directing member which is located in the path of radiation issuing from one end of one or more first optical fibers the other end or ends of which receive radiation from a suitable source, and the member controls the amount of radiation entering the adjacent end or ends of one or more second optical fibers which convey the radiation to an optical detector. The latter selects the speed of the motor in dependency on the amount of radiation which is transmitted into the second optical fiber or fibers and selects the position of the needle when the motor is off. The radiation directing member can constitute a glass plate which is rotatable or performs translatory movements between the first and second optical fibers and includes portions of different radiation transmissivity or reflectivity.
REFERENCES:
patent: 1582702 (1926-04-01), Stoekle et al.
patent: 3145304 (1964-08-01), Bostrom et al.
patent: 3738297 (1973-06-01), Sangiorgi
patent: 4310788 (1982-01-01), Hanyu
patent: 4386301 (1983-05-01), Neki et al.
patent: 4399393 (1983-08-01), Santini
patent: 4459523 (1984-07-01), Evans et al.
Kasig Rudiger
Weber Peter
Fritz Gegauf Aktiengesellschaft Bernina Nahmaschinenfabrik
Kontler Peter K.
Ro Bentsu
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