Electricity: motive power systems – Plural diverse motor controls – Running-speed control
Patent
1977-09-09
1979-02-13
Rubinson, Gene Z.
Electricity: motive power systems
Plural diverse motor controls
Running-speed control
318302, 318345G, 318374, 318466, H02P 310
Patent
active
041398084
ABSTRACT:
A sewing machine driven by a motor which is adapted to be energized by an alternate current power supply and is phase controlled by means of thyristors. In a normal operating mode the conduction phase of the thyristors is made variable as a function of the extent of the depression of a foot controlled pedal, whereas in a low constant speed mode the thyristors are made conductive at a predetermined phase. The motor is coupled to a main shaft which is provided with a magnet located at a predetermined position, while a bracket arm is provided with a reed switch located at a predetermined position, such that if and when the foot controlled pedal is released, the reed switch is actuated to trigger the thyristors for reverse braking of the motor as a function of the counter electromotive force of the motor. Preferably, a timer is provided for interrupting the power supply after the lapse of a predetermined time period after the foot controlled pedal is released.
REFERENCES:
patent: 3564376 (1971-02-01), Mais et al.
patent: 3735224 (1973-05-01), Bachofer et al.
patent: 3832613 (1974-08-01), Bernstein et al.
patent: 3906315 (1975-09-01), Gotisar
Maruzen Sewing Machine Co., Ltd.
Rubinson Gene Z.
LandOfFree
Control apparatus for electrically driven sewing machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control apparatus for electrically driven sewing machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control apparatus for electrically driven sewing machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-693061