Powder detecting capacitance-type sensor
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United States of America Patent
Stats
-
Feb 18, 2003
Grant Date -
Dec 6, 2001
app pub date -
May 29, 2001
filing date -
May 31, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A powder detecting capacitance-type sensor having a protection cover disposed inside of a 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. Also, a space, which is enclosed by the protection cover, the cover guide and the sensor body, is in communication with an air inlet. Thus, compressed air can be introduced into the air inlet and blown outside through the protection cover to prevent powder from attaching or depositing on the protection cover.
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