| 摘要 |
PROBLEM TO BE SOLVED: To exactly understand the clogging state of an air filter and to automatically exchange the air filter and to improve clogging detecting accuracy. SOLUTION: The air filter 5 for cleaning the air in the device by taking the open air 15 is formed in endless shape and has a belt gear at above and below. An air flow reduction data of a blower part 4 from an airflow meter 7 in accordance with the sticking (clogging) of dust to the air filter 5 and a resistant value reduction data resulting from temp. rising from a thermistor 6 enter into a deciding part 3, and in the case when the data is more than a threshold value previously set, the deciding part 3 actuates a switch 2, and current is supplied to a motor part 1a and an air filter driving part 1 and gears 10 and 11 are moved. In such a way, the belt gear and the air filter 5 are moved, and a virgin part of an unclogged air filter 5 comes at a working position and is automatically exchanged. |
