JPH0463460U

JPH0463460U -

Info

Publication number: JPH0463460U
Application number: JP10744690U
Authority: JP
Priority date: 1990-10-12
Filing date: 1990-10-12
Publication date: 1992-05-29

Description

[Brief explanation of drawings]

第１図は本考案の現像装置を適用する複写機の
模式的な構成図、第２図は感光ドラムに対して現
像スリーブのギヤツプを一定に保持する機構を説
明するための図、第３図はオゾン濃度と像流れ発
生状況を示すための図、第４図は本考案により感
光ドラムと現像スリーブのギヤツプを用紙エツジ
部で異ならせる機構の１例を説明するための図、
第５図は現像スリーブと感光ドラムの間のギヤツ
プを変化させたときのカブリの程度を測定した結
果を示す図、第６図はカブリレベルに対する装置
奥側のエツジ近傍において発生する像流れの発生
状況を測定した結果を示す図、第７図はＯＰＣ感
光体の断面図である。１……感光ドラム、２……主帯電器、３……イ
ンターイメージランプ、４……露光位置、５……
現像器、６……転写帯電器、７……剥離帯電器、
８……転写装置、９……トナーデスターバー用ブ
ラシ、１０……ブレード、１１……クリーニング
装置、１２……レジストローラ対、１３……搬送
ベルト、１４……一成分磁性トナー、１５……マ
グネツトロール、１６……現像スリーブ、１７…
…トナー量規制部材、１８……ホツパ、１９……
軸、２０……フレーム、２１……トラツキングロ
ール、２２……交流電源、２３……直流電源、１
７１……板バネ、１７２……シリコンゴム、２１
１……装置手前側のトラツキングロール、２１２
……装置奥側のトラツキングロール。 Fig. 1 is a schematic configuration diagram of a copying machine to which the developing device of the present invention is applied, Fig. 2 is a diagram for explaining the mechanism for maintaining a constant gap of the developing sleeve with respect to the photosensitive drum, and Fig. 3 4 is a diagram for explaining the ozone concentration and the occurrence of image deletion, and FIG. 4 is a diagram for explaining an example of a mechanism for varying the gap between the photosensitive drum and the developing sleeve at the edge of the paper according to the present invention.
Figure 5 shows the results of measuring the degree of fog when changing the gap between the developing sleeve and the photosensitive drum, and Figure 6 shows the occurrence of image blurring near the edge on the back side of the device relative to the fog level. FIG. 7, which is a diagram showing the results of measuring the situation, is a cross-sectional view of the OPC photoreceptor. 1... Photosensitive drum, 2... Main charger, 3... Interimage lamp, 4... Exposure position, 5...
Developing device, 6...Transfer charger, 7...Peeling charger,
8...Transfer device, 9...Brush for toner deturbator, 10...Blade, 11...Cleaning device, 12...Register roller pair, 13...Transport belt, 14...One-component magnetic toner, 15... Magnet roll, 16...Developing sleeve, 17...
...Toner amount regulating member, 18...Hopper, 19...
Axis, 20...Frame, 21...Tracking roll, 22...AC power supply, 23...DC power supply, 1
71...Plate spring, 172...Silicone rubber, 21
1...Tracking roll on the front side of the device, 212
...Tracking roll on the back side of the device.

Claims

[Claims for Utility Model Registration] (1) Developing an electrostatic latent image formed on a photoreceptor with toner charged to the opposite polarity to the electrostatic latent image, and transferring the resulting toner image to paper. A developing device in an image forming apparatus that has a developing sleeve that is rotatably arranged with a gap from the surface of the photoreceptor, to which a developing voltage is applied, and that carries toner on the surface of the developing device. A developing device for an image forming apparatus, wherein a gap between a developing sleeve and a photoreceptor at an edge portion is set smaller at an edge portion closer to the center of the photoreceptor. (2) The developing sleeve has tracking rolls at both ends that maintain a constant gap between the developing sleeve and the photoreceptor by rotating in contact with the photoreceptor, and both tracking rolls have different diameters. 2. A developing device in an image forming apparatus according to claim 1.