| 摘要 |
A powder detecting capacitance-type sensor having a protection cover disposed inside of the powder tank so as to cover a sensor body. The protection cover is made of porous material to permit compressed air to communicate from an inner surface to an outer surface of the protection cover. The protection cover is made of half-sinter of e.g. polyethylene. The space, which is enclosed by the protection cover, the cover guide and the sensor body, communicates with an air inlet. The compressed air that is introduced into the air inlet blows outside through the protection cover to prevent powder from attaching or depositing on the protection cover.
|
