Sewing machine incorporating a programmable control and a low-in

Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems

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112158E, G05B 1942

Patent

active

043896049

ABSTRACT:
A sewing machine includes as a driving element the low-inertia electric motor which is controlled by an electronic controller which receives signals from a digital/analog converter controlled by a microprogrammed controller. The low-inertia motor includes an electronic tachometer electrically connected to a speed controller which is comprised of an adjusting and control stage and a power distribution stage. The adjusting and control stage receives signals from a tachometric feed-back circuit as well as signals from a feed-back circuit of the intensity consumed by the low-inertia motor and also a reference signal from the digital analog controller. The adjusting and control stage supplies a signal of the state of motion for the coupling interphase with the controller and signals of speed control and operating speed control of the low-inertia motor. The power distribution stage comprises an alternating to direct current converter followed by a controlled direct to alternating current converter connected to the primary of a transformer having a ferrita core, the secondary of which is connected to a second direct to alternating current converter which feeds the low inertia motor. The adjusting and control stage at all times makes a comparison by means of operational amplifiers of their input signals, as a result of which comparison it porportions an output which controls the controlled direct to alternating current converter as well as a second output susceptible of activating conduction, depending on the polarity of a pair of transistors incorporated in the feed-back circuit of the low-inertia motor, which transistors control the direction of rotation of the motor.

REFERENCES:
patent: 4074642 (1978-02-01), Herr
patent: 4085691 (1978-04-01), Coughenour et al.
patent: 4092938 (1978-06-01), Coughenour et al.
patent: 4108090 (1978-08-01), Landau et al.
patent: 4199814 (1980-04-01), Rapp et al.

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