Rotary cutter drive control with electric motor

Details Rotary cutter drive control with electric motor Rotary cutter drive control with electric motor

1976-12-07

1978-09-12

Schaefer, Robert K.

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

318342, G05B 1928

Patent

active

041140796

ABSTRACT:
An apparatus for controlling the speed of a rotary cutter driven by an electric motor for cutting to length a sheet material continuously supplied to the rotary cutter. Means are provided for applying to the electric motor a dc voltage whose amplitude is proportional to the rate of the number of pulses of a pulse train said pulse train being synchronous with the feed rate of the sheet material when the blades of the rotary cutter pass the cutting position, means for progressively decreasing the number of pulses of the pulse train, the decrease in the number of pulses beginning at a predetermined position beyond the cutting position and being effected at a rate following a first pattern, means for progressively lowering the rate of the decrease in accordance with a second pattern when the number by which the pulses are decreased reaches a first predetermined value, and means for suspending the decrease when the number by which the pulses are decreased reaches a second predetermined value.

REFERENCES:
patent: 3949286 (1976-04-01), Appelgren
patent: 4015183 (1977-03-01), Miyakita

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