JPH0472249U

JPH0472249U -

Info

Publication number: JPH0472249U
Application number: JP11706890U
Authority: JP
Priority date: 1990-11-06
Filing date: 1990-11-06
Publication date: 1992-06-25

Description

[Brief explanation of drawings]

第１〜４図は本考案に係る画像形成装置の一実
施例を示す図であり、第１図はその現像ユニツト
の近傍を示す説明図、第２図はその現像ローラを
示す正面図、第３図は第２図の−矢視断面図
、第４図はその作用を示す説明図である。第５，
６図はそれぞれ従来の画像形成装置の現像ユニツ
トの近傍を示す説明図であり、第５図ａ〜ｄはそ
れぞれその動作状態を示す説明図、第６図ａ，ｂ
は他のそれぞれその動作状態を示す説明図である
。１１……画像形成装置、１３……感光体ドラム
（潜像担持体）、１５……現像ローラ（現像剤担
持体）、２０……移動手段、２６……コントロー
ルユニツト（移動制御手段）。 1 to 4 are diagrams showing an embodiment of the image forming apparatus according to the present invention, in which FIG. 1 is an explanatory view showing the vicinity of the developing unit, FIG. 2 is a front view showing the developing roller, and FIG. 3 is a sectional view taken along the - arrow in FIG. 2, and FIG. 4 is an explanatory diagram showing its operation. Fifth,
6 is an explanatory diagram showing the vicinity of a developing unit of a conventional image forming apparatus, FIGS. 5 a to d are explanatory diagrams showing the operating state thereof, and FIGS.
are explanatory diagrams showing the operating states of each of the others. DESCRIPTION OF SYMBOLS 11... Image forming apparatus, 13... Photosensitive drum (latent image carrier), 15... Developing roller (developer carrier), 20... Movement means, 26... Control unit (movement control means).

Claims

[Claims for Utility Model Registration] (1) A flexible developer carrier that forms a thin layer of developer on its surface and develops a latent image when brought into contact with the latent image carrier, and the latent image carrier. a moving means for moving the developer carrier in a tangential direction of the latent image carrier with respect to the contact position of the body and holding the developer carrier so as to be able to come into contact with and separate from the latent image carrier; 1. An image forming apparatus comprising: movement control means for controlling the body so that the body is normally separated from the latent image carrier and comes into contact with the latent image carrier only during development. (2) The image forming apparatus according to claim 1, wherein the moving means has two developer carriers that move in the tangential direction and can approach and separate from the latent image carrier. (3) The image forming apparatus according to claim 1 or 2, further comprising a plurality of the developer carriers and a plurality of the moving means.