JPS5598771A - Toner concentration detecting method of developing device - Google Patents
Toner concentration detecting method of developing deviceInfo
- Publication number
- JPS5598771A JPS5598771A JP627279A JP627279A JPS5598771A JP S5598771 A JPS5598771 A JP S5598771A JP 627279 A JP627279 A JP 627279A JP 627279 A JP627279 A JP 627279A JP S5598771 A JPS5598771 A JP S5598771A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- operating piece
- switch
- defining plate
- toner concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
PURPOSE:To make possible the detection of toner concentration in the developer with a simple constitution by rotatably providing a defining plate in the state of being spring-deviated against developer feeding force. CONSTITUTION:A defining plate 35 is provided rotatably in the feed direction according to pressure by the developer 4 under feeding and a switch operating piece 51 is provided to this defining plate 35. The switch operating piece 51 is held energized in the direction opposite from the developer feed direction by a spring 52. A switch 53 which corresponds to the switch operating piece 51 is disposed in the position where it goes ON when the operating piece 51 turns by the specified mount. Now, when the toner amount in the developer 4 decreases, its viscosity decreases as well, resulting in the increased pressure of the developer 4. As a result of this, the defining plate 35 is rotated in the feed direction against the spring 52, by which the switch 53 is turned ON to operate a toner replenishment control unit. In this way, the toner concentration in the developer may be detected with the simple constitution.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP627279A JPS5598771A (en) | 1979-01-22 | 1979-01-22 | Toner concentration detecting method of developing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP627279A JPS5598771A (en) | 1979-01-22 | 1979-01-22 | Toner concentration detecting method of developing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5598771A true JPS5598771A (en) | 1980-07-28 |
Family
ID=11633775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP627279A Pending JPS5598771A (en) | 1979-01-22 | 1979-01-22 | Toner concentration detecting method of developing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5598771A (en) |
-
1979
- 1979-01-22 JP JP627279A patent/JPS5598771A/en active Pending
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