JPH0442667U

JPH0442667U -

Info

Publication number: JPH0442667U
Application number: JP8417990U
Authority: JP
Priority date: 1990-08-08
Filing date: 1990-08-08
Publication date: 1992-04-10

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例としての現像器を適
用した画像形成プロセスユニツト示す模式的断面
図、第２図は上記現像器に使用する攪拌ロールを
示す斜視図、第３図及び第４図は上記現像器の動
作を示す端部断面図と中央断面図、第５図ａ及び
第５図ｂは夫々本考案の他の実施例を異なる時点
で示した各正面図、第６図は従来の現像装置を示
す模式的断面図である。１，６５……感光体ドラム、２，６１……補給
トナー収容槽、３，６２……現像槽、４，６３…
…トナー補給ロール、５，９，６４……攪拌ロー
ル、５ｂ〜５ｅ……攪拌羽根、６，６６……現像
スリーブ、７……ドクタブレード、８，１０，６
７……トナー濃度検出センサ、９ｂ_１〜９ｂ_６…
…攪拌フイン、ｄ……現像剤、Ｄ……現像位置、
Ｑ……濃度検出領域、Ｓ_１〜Ｓ_４……切り欠き、
ｔ……補給トナー。 FIG. 1 is a schematic sectional view showing an image forming process unit using a developing device as an embodiment of the present invention, FIG. 2 is a perspective view showing an agitation roll used in the developing device, and FIGS. The figures are an end sectional view and a central sectional view showing the operation of the developing device, FIGS. 5a and 5b are front views showing other embodiments of the present invention at different times, and FIG. FIG. 2 is a schematic cross-sectional view showing a conventional developing device. 1,65...Photosensitive drum, 2,61...Replenishment toner storage tank, 3,62...Developer tank, 4,63...
...Toner supply roll, 5, 9, 64... Stirring roll, 5b-5e... Stirring blade, 6,66... Developing sleeve, 7... Doctor blade, 8, 10, 6
7... Toner concentration detection sensor, 9b ₁ to 9b ₆ ...
...Agitation fin, d...Developer, D...Development position,
Q...Concentration detection area, _S1 to _S4 ...Notch,
t...Supplementary toner.

Claims

[Scope of utility model registration request]

A developer tank containing a developer containing toner and a carrier, a toner storage tank connected to the developer tank and containing replenishment toner, and an agitating blade installed on a rotating shaft. a developer agitating member installed with a rotating shaft extending horizontally; and a developer agitating member provided on a side wall of the developer tank extending upward from the bottom of the developer tank along the developer agitating member. a toner concentration detection member that detects the toner concentration in the developer, which is disposed with a detection surface facing the developer; and a toner replenishment member that replenishes the replenishment toner into the developer tank based on the detected value of the toner concentration. , in a developing device comprising a developer transporting member disposed in parallel with the developer stirring member and transporting the developer to a developing position, the rotational direction of the developer stirring member is set in a direction in which the rotation direction of the developer stirring member is raised on the detection surface side. Further, the developing device is characterized in that the stirring blade is not provided at least in a portion facing the detection surface.