Vacuum cleaner with function to adjust sensitivity of dust sensor
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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Abstract
A vacuum cleaner includes an agitator brush which only becomes operational when a carpeted floor is being cleaned. In order to avoid erroneous activation of a dust indicator lamp when individual strands of carpet pile are pulled onto the cleaner, a surface discrimination device lowers the sensitivity of a dust sensor circuit, which drives the lamp, when shag or high pile carpet is encountered so as to prevent erroneous signaling of the presence of dust.
181 Citations
5 Claims
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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:
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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; anddiscrimination 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. - View Dependent Claims (2, 3, 4, 5)
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Specification