JPH0343665U

JPH0343665U -

Info

Publication number: JPH0343665U
Application number: JP10510389U
Authority: JP
Priority date: 1989-09-07
Filing date: 1989-09-07
Publication date: 1991-04-24

Description

[Brief explanation of drawings]

第１図は本考案の実施例を示す要部横断面図、
第２図は第１図に示すトナーレベルセンサを構成
する検出ヘツドの要部拡大縦断面図、第３図は検
出回路の例を示すブロツク図、第４図は第３図に
示す検出回路の作動説明図である。４……スリーブ、５……永久磁石部材、７……
搬送撹拌部材、８ａ……検出面、９……クリーニ
ング部材。 FIG. 1 is a cross-sectional view of main parts showing an embodiment of the present invention;
2 is an enlarged vertical cross-sectional view of the main part of the detection head constituting the toner level sensor shown in FIG. 1, FIG. 3 is a block diagram showing an example of the detection circuit, and FIG. 4 is a block diagram of the detection circuit shown in FIG. 3. It is an operation explanatory diagram. 4...Sleeve, 5...Permanent magnet member, 7...
Conveyance stirring member, 8a...detection surface, 9...cleaning member.

Claims

[Claims for Utility Model Registration] (1) A sleeve formed of a non-magnetic material in a hollow cylindrical shape and rotatable, and a plurality of magnetic poles interposed within the sleeve so as to be relatively rotatable and extending in the axial direction on the outer peripheral surface. a permanent magnet member provided with a permanent magnet member, a movable member for accommodating developer containing magnetic toner and for transporting and stirring the developer, supporting the sleeve and the permanent magnet member, and having a detection surface facing the developer. In a developing device equipped with a level sensor, a cleaning member made of a permanent magnet is provided on the outer periphery of a movable member facing the detection surface, and a magnetic brush formed by developer attracted to the permanent magnet is used to detect the toner level sensor. A developing device configured to clean a detection surface. (2) The toner level sensor includes a detection head including a primary coil and a secondary coil electromagnetically coupled to the primary coil, an oscillation circuit that supplies alternating current to the primary coil, and the secondary coil. and an electric circuit including a phase detection circuit for detecting a phase change in the differential output generated from the phase detection circuit, and is configured to obtain an output signal corresponding to a change in apparent magnetic permeability of the magnetic developer from the output of the phase detection circuit. The developing device according to claim 1, which is a magnetic bridge type sensor.