JPS5943961U

JPS5943961U - developing device

Info

Publication number: JPS5943961U
Application number: JP13842682U
Authority: JP
Inventors: 犬飼　維正
Original assignee: 株式会社東芝
Priority date: 1982-09-14
Filing date: 1982-09-14
Publication date: 1984-03-23

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図ａは従来例を示す断面正面図、第１図すは同例を
示す断面側面図、第２図は同例の要部を示す断面正面図
、第３図は同例を示す斜視図、第４図は本考案の第１の
実施例を示す断面側面図、第５図は同例の要部を示す断
面正面図、第６図は同例を示す拡大正面図、第７図は本
考案の第２の実施例を示す斜視図、第８図は本考案の第
３の実施例を示す正面図である。Fig. 1a is a sectional front view showing a conventional example, Fig. 1 is a sectional side view showing the same example, Fig. 2 is a sectional front view showing main parts of the same example, and Fig. 3 is a perspective view showing the same example. 4 is a cross-sectional side view showing the first embodiment of the present invention, FIG. 5 is a cross-sectional front view showing the main parts of the same example, FIG. 6 is an enlarged front view showing the same example, and FIG. 8 is a perspective view showing a second embodiment of the present invention, and FIG. 8 is a front view showing a third embodiment of the present invention.

Claims

[Scope of utility model registration request]

(1) A developing device in which a sleeve rotates around a magnet fixed opposite the image bearing surface on which the electrostatic latent image is formed, attracting and conveying developer to the image bearing surface to develop the electrostatic latent image. , at least one magnetic pole located upstream in the rotational direction of the sleeve from the magnetic pole facing closest to the image bearing surface.
A developing device characterized in that an effective length in a longitudinal direction of one of the magnetic poles that exerts a magnetic force on the sleeve surface is shorter than an effective length of a longitudinal force that exerts a magnetic force on the sleeve surface of the other magnetic poles.

(2) A request for registration of a utility model characterized in that the effective length of a magnetic pole that exerts a magnetic force on the sleeve surface is shorter than other magnetic poles in the longitudinal direction, and that the effective length is shorter than the effective development width in the longitudinal direction on the sleeve surface. The developing device according to item 1.

(3) The effective length in the longitudinal direction of each magnetic pole that exerts magnetic force on the sleeve surface becomes longer from upstream to downstream in the rotational direction of the sleeve, as described in claim 1 of the utility model registration claim. developing device.

(4) A practical application characterized in that a magnetic shielding plate is provided between the magnet and the sleeve to change the effective length in the longitudinal direction of the magnetic pole of the magnet that exerts magnetic force on the sleeve surface. Developing device according to any one of Item 3.

(5) The developing device according to any one of claims 1 to 3, characterized in that a plurality of magnets having different lengths in the longitudinal direction are arranged and fixed.

(6) The developing device according to claim 3, which is a utility model registration, characterized in that it uses a cylindrical magnet having a plurality of magnetic poles on its surface and having both ends cut out diagonally.