JPH0322263U - - Google Patents
Info
- Publication number
- JPH0322263U JPH0322263U JP8301589U JP8301589U JPH0322263U JP H0322263 U JPH0322263 U JP H0322263U JP 8301589 U JP8301589 U JP 8301589U JP 8301589 U JP8301589 U JP 8301589U JP H0322263 U JPH0322263 U JP H0322263U
- Authority
- JP
- Japan
- Prior art keywords
- toner
- detection sensor
- developing device
- absence
- toner end
- 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)
Description
第１図は本考案の一実施例のブロツク構成図、
第２図はトナー検知センサーの発振出力状態を説
明する波形図、第３図は本考案が適用される一例
としてのレーザープリンタの構成を示す断面図で
ある。
１…マイクロコンピユータ（ＣＰＵ）、２…計
数回路、２３…トナー検知センサー。
FIG. 1 is a block diagram of an embodiment of the present invention.
FIG. 2 is a waveform diagram illustrating the oscillation output state of the toner detection sensor, and FIG. 3 is a sectional view showing the configuration of a laser printer as an example to which the present invention is applied. 1... Microcomputer (CPU), 2... Counting circuit, 23... Toner detection sensor.
Claims (1)
型トナー検知センサーと、該トナー検知センサー
のＴ時間内で発振している時間、またはパルス数
を計数する回路と、予め決められたトナーエンド
を示す値と前記計数回路の出力とを比較し、トナ
ーエンドを判断し、かつ、前記現像器にトナー検
知センサーが設定されていないとき入力ポートへ
の入力レベルから現像器の有無を判断する制御部
とを有することを特徴とするトナーエンド検知と
現像器有無検知装置。 A piezoelectric vibration type toner detection sensor set in the developing device of an image forming apparatus, a circuit that counts the oscillation time or pulse number within T time of the toner detection sensor, and a predetermined toner end detection sensor. a control unit that compares the indicated value with the output of the counting circuit to determine toner end, and determines the presence or absence of the developing device based on the input level to the input port when a toner detection sensor is not set in the developing device; What is claimed is: 1. A toner end detection device and a developing device presence/absence detection device, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8301589U JPH0322263U (en) | 1989-07-17 | 1989-07-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8301589U JPH0322263U (en) | 1989-07-17 | 1989-07-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0322263U true JPH0322263U (en) | 1991-03-07 |
Family
ID=31630330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8301589U Pending JPH0322263U (en) | 1989-07-17 | 1989-07-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0322263U (en) |
-
1989
- 1989-07-17 JP JP8301589U patent/JPH0322263U/ja active Pending
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