| 摘要 |
PROBLEM TO BE SOLVED: To provide an air cleaning unit, provided above a warm-air heating unit, with a detecting means, for detecting the clogging of a filter by dust as well as the adhesion of foreign matters, such as a towel or the like, to the upper part of an instrument upon adhesion, and a damage preventing countermeasure for the parts of the instrument. SOLUTION: A pressure change in a duct 18 due to the clogging of a filter 13, is detected correctly by a pressure detector 22, provided at the upper central part of a connecting part between the air cleaning filter 13 and an air cleaning fan 15, which are arranged in the upper part of a warm-air heating unit, while the output signal of the pressure detector 22 is controlled by a control unit 23 so as to indicate the clogging of the filter 13 by dust or stop the operation of the warm-air heating unit or the air cleaner upon abnormality. |
