JPS62195161U

JPS62195161U -

Info

Publication number: JPS62195161U
Application number: JP8440586U
Authority: JP
Priority date: 1986-06-03
Filing date: 1986-06-03
Publication date: 1987-12-11

Description

[Brief explanation of the drawing]

第１図は本考案に係る画像形成装置の一実施例
の構成を示す概略側面図、第２図は第１図に示す
画像形成装置によつて行なわれる画像形成プロセ
スを示すブロツク図、第３図は第２図に示すプロ
セススケツプにおける感光体ドラムの表面電位の
変化を示す図、第４図は第１図に示す黒消し装置
の動作を示す図、第５図は本考案による黒消し動
作を説明するための原稿と露光方向を示す図、第
６図は感光体ドラムの表面電位を示す図、第７図
はコントローラへの入力信号を示す図、第８図は
黒消しランプの点灯のタイミングを示す図、第９
図はコントローラの構成の一例を示す図、第１０
図は黒消しランプ点灯のフローチヤートである。１……感光体ドラム、２……前除電帯電器、３
……前露光ランプ、４……１次帯電器、５……２
次帯電器、６……画像光、７……ブランク／シヤ
ープカツト露光、８……全面露光、９……現像器
、１０……転写帯電器、１１……給紙部、１２…
…クリーナブレード、１３，１４……定着ローラ
、１５……電位センサ、１６……黒消しランプ、
１７……ドラム回転方向、１８……コピー用紙の
流れ、１９……電位測定回路、２０……コントロ
ーラ、２１……スイツチ、２２……電位センサか
ら電位測定回路への信号、２３……電位測定回路
からコントローラへの信号、２４……コントロー
ラ黒消し露光ランプへのオン信号、２５……原稿
、２６……ランプ点灯用のトランジスタ、２７…
…カウンタのリセツト信号、２８……カウント信
号。 FIG. 1 is a schematic side view showing the configuration of an embodiment of an image forming apparatus according to the present invention, FIG. 2 is a block diagram showing an image forming process performed by the image forming apparatus shown in FIG. 1, and FIG. The figure shows changes in the surface potential of the photoreceptor drum in the process sketch shown in Fig. 2, Fig. 4 shows the operation of the black erasing device shown in Fig. 1, and Fig. 5 shows the black eraser according to the present invention. Figure 6 shows the original and exposure direction to explain the erasing operation, Figure 6 shows the surface potential of the photoreceptor drum, Figure 7 shows the input signal to the controller, and Figure 8 shows the black erasing lamp. Diagram showing timing of lighting, No. 9
Figure 10 shows an example of the configuration of the controller.
The figure is a flowchart for turning on the black out lamp. 1...Photosensitive drum, 2...Pre-static charger, 3
...Pre-exposure lamp, 4...Primary charger, 5...2
Next charger, 6...Image light, 7...Blank/sharp cut exposure, 8...Full exposure, 9...Developer, 10...Transfer charger, 11...Paper feed section, 12...
... Cleaner blade, 13, 14 ... Fixing roller, 15 ... Potential sensor, 16 ... Black eraser lamp,
17... Drum rotation direction, 18... Flow of copy paper, 19... Potential measurement circuit, 20... Controller, 21... Switch, 22... Signal from potential sensor to potential measurement circuit, 23... Potential measurement Signal from the circuit to the controller, 24...On signal to controller black-out exposure lamp, 25... Original, 26... Transistor for lamp lighting, 27...
...Counter reset signal, 28...Count signal.

Claims

[Scope of utility model registration request]

An image forming apparatus that forms a latent image on the surface of a photoreceptor by forming an image on the photoreceptor with image light obtained by exposing an original image, and develops the latent image to form a visible image. In order to erase the black part caused by the shadow of the original when exposing the original image, it is equipped with a surface potential sensor that detects the potential on the surface of the photoreceptor, and a black-out lamp that emits light in conjunction with the output of the sensor. image forming apparatus.