JPH02148151U

JPH02148151U -

Info

Publication number: JPH02148151U
Application number: JP5653089U
Authority: JP
Priority date: 1989-05-18
Filing date: 1989-05-18
Publication date: 1990-12-17

Description

[Brief explanation of drawings]

第１図はカラー画像形成装置の部分断面概略図
、第２図ａ，ｂは駆動手段の構成と、その作動状
態を説明する図、第３図は第２図ａの−線断
面図、第４図は第２図ａの−線断面図、第５
図ａ，ｂ，ｃは従来のカラー画像形成装置におけ
る負荷変動、速度偏差及び制御位置ずれを示す説
明図、第６図ａ，ｂ，ｃは本考案に係る駆動手段
によつて得られる負荷変動、速度偏差及び制御位
置ずれの一例を示す説明図、第７図は第２図ａ，
ｂに示したカムのカム線図、第８図は他の実施例
を示す、第２図ａと同様な図である。７Ｙ，７Ｍ，７Ｃ，７ＢＫ……現像器、２３…
…駆動モータ、２４……駆動ギア、２６……従動
ギア、２７……回動アーム、３１……カム。 1 is a schematic partial cross-sectional view of a color image forming apparatus, FIGS. 2a and 2b are diagrams illustrating the configuration of the driving means and its operating state, and FIG. Figure 4 is a sectional view taken along the - line in Figure 2a, and Figure 5
Figures a, b, and c are explanatory diagrams showing load fluctuations, speed deviations, and control position deviations in a conventional color image forming apparatus, and Figures 6 a, b, and c are load fluctuations obtained by the driving means according to the present invention. , an explanatory diagram showing an example of speed deviation and control position deviation, FIG. 7 is similar to FIG. 2a,
The cam diagram of the cam shown in FIG. 8b is a diagram similar to FIG. 2a, showing another embodiment. 7Y, 7M, 7C, 7BK...Developer, 23...
... Drive motor, 24 ... Drive gear, 26 ... Driven gear, 27 ... Rotating arm, 31 ... Cam.

Claims

[Claims for Utility Model Registration] (1) A latent image carrier on which an electrostatic latent image is formed, a plurality of developing devices arranged opposite to the carrier and equipped with developers of different colors; a driving means for moving the selected developing device from its retracted position toward the latent image carrier and bringing it to a developing position where the developer carrier of the developing device is in contact with the latent image carrier; In a color image forming apparatus that visualizes the electrostatic latent image by a developer carried on a developer carrier of a developing device brought to a position, the driving means includes a developer carrier that is a latent image. A color image forming apparatus characterized by using a driving device that applies a ramp-type load that gradually increases to the latent image carrier when it comes into contact with the latent image carrier. (2) The driving means includes a guide for guiding the developing device when the developing device is moved, a driving motor supported on the image forming apparatus main body side, a driving gear rotationally driven by the motor, and the developing device. a driven gear that is integrally attached to the agent carrier and meshes with the driving gear directly or through another gear; a rotating arm that is rotatably supported on the developing device; a pressure member that comes into contact with the rotating arm and transmits the force to the rotating arm when the developing unit is about to move toward the latent image carrier due to the operation of the drive motor; The rotation of the rotary arm that receives pressure from the pressure member is prevented to prevent the developing unit from moving from the retracted position, or the rotary arm is allowed to rotate so that the developing unit moves from the retracted position to the developing position. 2. A color image forming apparatus according to claim 1, comprising: a cam rotatably supported on the image forming apparatus main body side so as to allow the cam to move; and a cam motor for rotationally driving the cam.