Numerical control unit
AssigneeFanuc Corporation
InventorMitsuo Kurakake
Life of this patent
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Abstract
In a numerical control unit capable of driving a motor at a feed speed designated by a feed speed-designation dial, there are provided a potentiometer for generating a DC voltage proportional to the amount that a feed speed-designation knob is turned and an AD converter for converting the DC voltage output from the potentiometer into a digital quantity, the AD converter output being read out by a main processor section. The circuit construction can be markedly simplified as compared with the conventional circuit construction employing a voltage-controlled variable oscillator.
Claims4
A numerical control unit for driving a motor at a feed speed designated by a feed speed dial on a control panel having a plurality of feed speed dials, each having a manually operable knob, the numerical control unit having a main processor section which performs data processing for numerical control and which emits a selection signal to select which of the feed speed dials will designate the motor's feed speed, comprising:
- potentiometer means corresponding to each knob for producing a DC voltage proportional to the amount that the corresponding knob is turned;
- analog/digital converter means for receiving an analog input signal and supplying a digital output signal to said main processor section;
- and
- switch means connected between said potentiometer means and said analog/digital converter means for selecting a DC voltage to apply to said analog/digital converter means as said input signal in response to said selection signal.
Dependencies are inferred from the claim text.