JPH0320344U - - Google Patents
Info
- Publication number
- JPH0320344U JPH0320344U JP7955489U JP7955489U JPH0320344U JP H0320344 U JPH0320344 U JP H0320344U JP 7955489 U JP7955489 U JP 7955489U JP 7955489 U JP7955489 U JP 7955489U JP H0320344 U JPH0320344 U JP H0320344U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- photoreceptor
- density
- copying
- eraser
- 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
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
Description
第１図は本考案を利用する複写装置の一例の説
明図、第２図は基準パターンと露光光源を示す説
明図、第３図は制御装置のブロツク図、第４図は
制御装置の一部の回路図、第５図は操作部の平面
説明図である。
１……感光体、２……帯電チヤージヤ、３……
ミラー、４……イレーサ、５，６……現像器、７
……転写前除電ランプ、８……転写チヤージヤ、
１２……クリーニング装置、１３……除電ランプ
、１４……光反射式濃度検知センサ。
Fig. 1 is an explanatory diagram of an example of a copying apparatus using the present invention, Fig. 2 is an explanatory diagram showing a reference pattern and an exposure light source, Fig. 3 is a block diagram of a control device, and Fig. 4 is a part of the control device. FIG. 5 is a plan view of the operating section. 1... Photoreceptor, 2... Charger, 3...
Mirror, 4...Eraser, 5, 6...Developer, 7
...Pre-transfer static elimination lamp, 8...Transfer charger,
12... Cleaning device, 13... Static elimination lamp, 14... Light reflection type concentration detection sensor.
Claims (1)
ナー像を転写材に転写し、その際感光体に基準パ
ターンを露光し、非画像部をイレーサにより電荷
消去して現像して基準パターントナー像と感光体
地肌濃度とを光反射式濃度検知センサにより検出
し、基準パターン像濃度と感光体地肌濃度との比
の値に基づいて現像装置のトナー濃度制御を行う
複写装置において、 所定のコピー枚数に達すると通常使用電圧より
低い予め設定してある印加電圧に切換えて前記イ
レーサを作動して、その際の感光体地肌濃度を前
記光反射式濃度検知センサにより検出し、予め定
めた所定値以下であるときには操作部上に警告表
示をしてコピー禁止状態とし、所定値を越えてい
る場合には前記イレーサの印加電圧を通常使用電
圧に復帰させてコピー可能状態を継続することを
特徴とする複写装置。[Scope of Utility Model Registration Claim] A toner image formed by charging, exposing, and developing a photoreceptor is transferred to a transfer material, at which time a reference pattern is exposed on the photoreceptor, and the charge is erased from non-image areas with an eraser. The reference pattern toner image and the photoreceptor background density are detected by a light reflection type density detection sensor, and the toner density of the developing device is controlled based on the ratio value of the reference pattern image density and the photoreceptor background density. In the copying machine, when a predetermined number of copies is reached, the applied voltage is switched to a preset voltage lower than the normally used voltage to operate the eraser, and the photoreceptor background density at that time is detected by the light reflection type density detection sensor. If the voltage is below a predetermined value, a warning is displayed on the operation unit to prohibit copying, and if the voltage exceeds the predetermined value, the voltage applied to the eraser is returned to the normal operating voltage to enable copying. A copying device characterized in that it continues to
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7955489U JPH0320344U (en) | 1989-07-07 | 1989-07-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7955489U JPH0320344U (en) | 1989-07-07 | 1989-07-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0320344U true JPH0320344U (en) | 1991-02-27 |
Family
ID=31623812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7955489U Pending JPH0320344U (en) | 1989-07-07 | 1989-07-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0320344U (en) |
-
1989
- 1989-07-07 JP JP7955489U patent/JPH0320344U/ja active Pending
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