Vacuum cleaner with function to adjust sensitivity of dust sensor

  • US 5,105,502 A
  • Filed: 06/11/1991
  • Issued: 04/21/1992
  • Est. Priority Date: 12/06/1988
  • Status: Expired due to Term
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First Claim
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1. A vacuum cleaner with a suction nozzle which draws dust from an object to be cleaned and which has therein a rotatable member coming into contact with said object, said vacuum cleaner comprising:

  • dust sensor means for detecting a quantity of dust present in air drawn through a suction passage of said vacuum cleaner coupled to said suction nozzle to generate a dust signal indicative of the result of the detection;

    adjusting means for adjusting the sensitivity of said dust sensor means for the dust detection in accordance with a control signal; and

    discrimination means for detecting the kind of object to be cleaned by said vacuum cleaner to generate a discrimination signal indicative thereof, said discrimination signal being supplied as the control signal to said adjusting means to adjust the sensitivity of said dust sensor means and further supplied to switching means which is in turn operable so as to drive said rotatable member in said suction nozzle.

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