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Manual control device

  • US 4,673,919 A
  • Filed: 07/18/1984
  • Issued: 06/16/1987
  • Est. Priority Date: 08/10/1983
  • Status: Expired due to Term
First Claim
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1. A manual control device wherein an incremental touch key is depressed by hand so as to bring into agreement a manipulated value and a set value displayed on a manipulated value indicator and a set value indicator, respectively, said control device comprising:

  • a pressure sensor for converting a hand contact pressure on the touch key into a voltage level proportional to this pressure,first means for providing output pulses,said first means including a level encoder for generating digital signals corresponding to the voltage level of said pressure sensor, pulse generators for generating frequency signals having different frequencies, and AND gates receiving and logically correlating the digital and frequency signals for providing output pulses of a frequency determined by the correlation,the output pulses having one of a plurality of different frequencies which vary in predetermined discrete steps, each one of the different frequencies corresponding to a range of voltage levels of said pressure sensor,a counter for counting the output pulses of said first means and for producing a digital output signal, andsecond means for driving the manipulated value indicator in accordance with the digital output signal from said counter.

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