Safety motor control means for an electrically driven machine

Details Safety motor control means for an electrically driven machine Safety motor control means for an electrically driven machine

1975-12-17

1977-12-27

Schaefer, Robert K.

Electricity: motive power systems

Motor-reversing

Automatic and/or with time-delay means

318283, H02P 122

Patent

active

040657078

ABSTRACT:
A machine for applying twine to a package, tying and severing the twine embodies a continuously operating electric drive motor and a mechanical clutch which is intermittently engaged by a machine operator utilizing a foot treadle. The mechanical clutch disengages following an operational cycle of the tying machine. Should the clutch be engaged when the machine is idle and should the motor subsequently be turned on, the tying mechanism is instantly activated creating a dangerous condition for the machine operator. The invention renders the machine safe under all conditions through the provision of a simplified electrical motor control device which assures a short duration reversal of the electric drive motor and associated mechanism sufficient to release the mechanical clutch and eliminate the safety hazard before the motor begins its normal continuous forward drive.

REFERENCES:
patent: 2489832 (1949-11-01), Symonds
patent: 2976807 (1961-03-01), Hill
patent: 3259824 (1966-07-01), Greenwald

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