JPH0345555U

JPH0345555U -

Info

Publication number: JPH0345555U
Application number: JP10546789U
Authority: JP
Priority date: 1989-09-09
Filing date: 1989-09-09
Publication date: 1991-04-26

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例であるレーザプリ
ンタの要部を示す構成図、第２図は同じくその偏
心カム１５の作用を説明するための説明図、第３
図は第１図の実施例の動作を説明するためのタイ
ミング図、第４図はこの考案の他の実施例の要部
のみを示す構成図、第５図は従来の画像形成装置
の要部のみを示す構成図である。１……現像ユニツト、１ａ……ケース、１ｂ…
…端板、２……感光体ドラム、３……現像ローラ
、４……トナー補給ローラ、５……ドクタブレー
ド、６……アジテータ、８……帯電チヤージヤ、
９……転写チヤージヤ、１１……クリーニングユ
ニツト、１２……前部支持部材、１３……後部支
持部材、１４……スプリング、１５……偏心カム
、１６……ロータリソレノイド、１７……搬送ロ
ーラ対、１８……ガイドブロツク、２３……レバ
ー、２５……偏心カム。 FIG. 1 is a configuration diagram showing the main parts of a laser printer that is an embodiment of this invention, FIG. 2 is an explanatory diagram for explaining the action of the eccentric cam 15, and FIG.
The figure is a timing diagram for explaining the operation of the embodiment of FIG. 1, FIG. 4 is a configuration diagram showing only the main parts of another embodiment of this invention, and FIG. 5 is the main part of a conventional image forming apparatus. FIG. 1...Developing unit, 1a...Case, 1b...
... end plate, 2 ... photosensitive drum, 3 ... developing roller, 4 ... toner supply roller, 5 ... doctor blade, 6 ... agitator, 8 ... charging charger,
9... Transfer charger, 11... Cleaning unit, 12... Front support member, 13... Rear support member, 14... Spring, 15... Eccentric cam, 16... Rotary solenoid, 17... Conveyance roller pair , 18...Guide block, 23...Lever, 25...Eccentric cam.

Claims

[Claims for Utility Model Registration] 1. In an image forming apparatus using a contact type developing device that develops a latent image on a photoreceptor by attaching toner to the latent image on the photoreceptor by rotating a developing roller in contact with the photoreceptor, The developing device is supported movably in a direction perpendicular to the rotational axis of the photoreceptor, and means is provided for moving the developing device so that the developing roller is separated from the photoreceptor when the developing step is not performed. An image forming apparatus using a contact type developing device. 2. In an image forming apparatus using a contact type developing device that develops by attaching toner to a latent image on the photoreceptor by rotating a developing roller in contact with the photoreceptor, the developing device is aligned with the rotation axis of the photoreceptor. The developing roller is supported so as to be movable in a direction orthogonal to the photoconductor, and the developing roller is separated from the photoconductor when the time from when the motor for rotating the photoconductor stops until the next image formation start command is received becomes longer than a set time. An image forming apparatus using a contact type developing device, characterized in that the device is provided with means for moving the developing device so that the developing roller comes into contact with the photoreceptor when an image formation start command is received.