JPH0485469U

JPH0485469U -

Info

Publication number: JPH0485469U
Application number: JP13036590U
Authority: JP
Priority date: 1990-11-30
Filing date: 1990-11-30
Publication date: 1992-07-24

Description

[Brief explanation of the drawing]

第１図はこの考案による複写機を制御系と共に
示す構成図、第２図は感光体上に形成された原稿
画像とその原稿画像端を検知するための画像端セ
ンサの一部を示す斜視図、第３図は感光体上に形
成された原稿画像と用紙上に転写された複写画像
の両方の説明に使用する便宜上兼用した説明図、
第４図は画像端センサを電気回路も含めて示した
概略図、第５図及び第６図は転写幅規制機構２０
と転写チヤージヤ８を共に示す斜視図及びその縦
断面図、第７図及び第８図は画像端検知手段の異
なる実施例を示す第２図及び第４図と同様な斜視
図及び概略図である。１……複写機本体、３……操作光学系、４……
露光ランプ、６……感光体、７……現像ユニツト
（現像手段）、８……転写チヤージヤ（転写手段
）、１０……制御装置、１３，４３……画像端セ
ンサ（画像端検知手段）、１８，１９……シヤツ
タ、２０……転写幅規制機構、２２……表面電位
検知部材、４１……フオトセンサ。 Fig. 1 is a block diagram showing a copying machine according to this invention together with a control system, and Fig. 2 is a perspective view showing a document image formed on a photoreceptor and part of an image edge sensor for detecting the edge of the document image. , FIG. 3 is an explanatory diagram used for convenience to explain both the original image formed on the photoreceptor and the copy image transferred onto the paper.
FIG. 4 is a schematic diagram showing the image edge sensor including the electric circuit, and FIGS. 5 and 6 are the transfer width regulating mechanism 20.
7 and 8 are perspective views and schematic views similar to FIGS. 2 and 4 showing different embodiments of the image edge detection means. . 1... Copying machine main body, 3... Operation optical system, 4...
Exposure lamp, 6... Photoreceptor, 7... Development unit (developing means), 8... Transfer charger (transfer means), 10... Control device, 13, 43... Image edge sensor (image edge detection means), 18, 19...Shutter, 20...Transfer width regulating mechanism, 22...Surface potential detection member, 41...Photo sensor.

Claims

[Claims for Utility Model Registration] 1. An electrostatic latent image forming means for forming an electrostatic latent image by forming an image on a moving photoreceptor whose surface is charged with reflected light from the image surface of an original; A copying machine equipped with a developing means for developing an electrolytic latent image with toner, and a transfer means for transferring the toner image developed by the developing means onto copy paper, wherein the reflection from the original on the photoreceptor is an image edge that is disposed in a direction perpendicular to the moving direction of the photoreceptor between the position where the light is imaged and the transfer means and detects the edge of the document image on the photoreceptor corresponding to the image edge of the document; In addition to providing a detection means, when the original image on the photoreceptor is transferred to copy paper of a larger size, the detection signal from the image edge detection means detects the front edge and the front edge of the original image on the photoreceptor. A copying machine characterized in that a copying machine is provided with a transfer length control means for stopping the operation of the transfer means after the rear end. 2. In the copying machine according to claim 1, when the original image on the photoreceptor is transferred to copy paper of a larger size, the original image on the photoreceptor is transferred by a detection signal from the image edge detection means. A copying machine characterized in that a copying machine is provided with a transfer width control means for disabling the operation of the transfer means outside both ends of the copying machine. 3. A copying machine according to claim 1 or 2, wherein the image edge detection means is a means for detecting an image edge of a document based on a potential distribution on a photoreceptor. 4. The copying machine according to claim 1 or 2, wherein the image edge detection means is a means for detecting the edge of the document image based on the density of toner on the photoreceptor.