Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1974-03-20
1977-03-22
Rubinson, G. Z.
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318266, 112219A, G05G 500, H02P 306, D05B 6922
Patent
active
040139336
ABSTRACT:
A rotating disc driven in synchronism with the reciprocating movement of the needle of a sewing machine has a plurality of cutaway arc-shaped sections having different arcs to produce a pulse train of frequency related to the motor speed. A photoelectrical device responds to intermittent light the interceptions being caused by the rotating disc. The pulse train comprises pulses of different pulse lengths, each corresponding to the lower and upper dead points of the needle. First and second pulse length detectors are provided to detect sequentially each of the pulse lengths in a controlled manner by the operator manipulation of a treadle so that the motor is decelerated from a preselected speed to a standstill with the needle at its lower or upper dead point.
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Dohi Takashi
Gotoh Iwao
Ohara Kenichi
Adams Bruce L.
Burns Robert E.
Feldhaus John J.
Lobato Emmanuel J.
Matsushita Electric - Industrial Co., Ltd.
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