Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1990-05-03
1993-02-02
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15339, A47L 928
Patent
active
051828332
ABSTRACT:
A vacuum cleaner has a blower motor; a dust detector responsive to a sucked dust particle due to rotation of the blower motor for producing a dust detecting signal when each of the dust particles is detected passing a portion in a suction passage; counter responsive to the dust detection signal for counting the number of the dust interception particles for a given interval; and input power controller responsive to an output signal of the counter for controlling the input power of the blower motor by selecting an input power value from plural preset input power values in accordance with the number. Controlling input power may be performed in accordance with a pulse width indicative of the dust particle size or the counted number may be modified by pulse width. Another embodiment of the vacuum cleaner has plural light emitting diodes for indicating the number counted to show an operator uncleanliness of the floor. The controller includes a microprocessor which can control a thyristor provided in series with the blower motor directly. In a vacuum cleaner where the thyristor is located in the housing, the microprocessor may be located in a handle portion, and a D/A converter and a phase control circuit may be provided in the housing.
REFERENCES:
patent: 4601082 (1986-07-01), Kurz
patent: 4680827 (1987-07-01), Hummel
patent: 4920605 (1990-05-01), Takashima
patent: 4942640 (1990-07-01), Hayashi et al.
Kajikawa Saburou
Kawakami Hiroshi
Kimura Masahiro
Matsuyo Tadashi
Moro Masaru
Matsushita Electric - Industrial Co., Ltd.
Moore Chris K.
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