Vacuum cleaner with device for adjusting sensitivity of dust sensor
First Claim
1. A vacuum cleaner with a rotatable cleaning member driven by a motor and housed in a suction nozzle which contacts an object to be cleaned, the motor being turned on upon closing of a first switch, the vacuum cleaner comprising:
- dust sensor means for detecting dust in air drawn through the suction nozzle;
shortable resistance means connected to the dust sensor means for adjusting the dust detection sensitivity of said dust sensor means;
means for coupling the resistance means to the first switch for decreasing the sensor sensitivity upon closing of the first switch; and
means connected to the output of the sensor means for indicating the presence of intake dust.
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Abstract
A vacuum cleaner with a dust sensor comprising a light-emitting element and a light-receiving element for receiving light emitted from the light-emitting element. The dust sensor is provided in a suction passage between a suction nozzle and a dust collector of the vacuum cleaner for detecting dust in air drawn through the suction nozzle to generate a current corresponding to the detection result. A manual switch decreases sensitivity to dust detection while a rotatable member cleans a carpet. This prevents variations in dust detection from influencing operation of the rotatable cleaning member.
163 Citations
3 Claims
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1. A vacuum cleaner with a rotatable cleaning member driven by a motor and housed in a suction nozzle which contacts an object to be cleaned, the motor being turned on upon closing of a first switch, the vacuum cleaner comprising:
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dust sensor means for detecting dust in air drawn through the suction nozzle; shortable resistance means connected to the dust sensor means for adjusting the dust detection sensitivity of said dust sensor means; means for coupling the resistance means to the first switch for decreasing the sensor sensitivity upon closing of the first switch; and means connected to the output of the sensor means for indicating the presence of intake dust. - View Dependent Claims (2, 3)
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Specification