JPH0267359U

JPH0267359U -

Info

Publication number: JPH0267359U
Application number: JP14444788U
Authority: JP
Priority date: 1988-11-07
Filing date: 1988-11-07
Publication date: 1990-05-22

Description

[Brief explanation of drawings]

第１図は本考案の二成分現像装置の概略断面図
、第２図は現像スリーブの内部に固定配置される
磁石群の変形例を示す説明図、第３図は先行技術
としての二成分現像装置の磁石の配置例を示す説
明図。１……感光体ドラム、２……上側現像ローラ、
２Ａ……上側磁石群、２Ｂ……上側現像スリーブ
、３……下側現像ローラ、３Ａ……下側磁石群、
３Ｂ……下側現像スリーブ。 Fig. 1 is a schematic sectional view of the two-component developing device of the present invention, Fig. 2 is an explanatory diagram showing a modification of the magnet group fixedly arranged inside the developing sleeve, and Fig. 3 is a two-component developing device as a prior art. FIG. 2 is an explanatory diagram showing an example of arrangement of magnets in the device. 1... Photosensitive drum, 2... Upper developing roller,
2A... Upper magnet group, 2B... Upper developing sleeve, 3... Lower developing roller, 3A... Lower magnet group,
3B...Lower developing sleeve.

Claims

[Scope of utility model registration request]

In a two-component developing device that performs development by placing a plurality of developing rollers in close proximity to a photoreceptor drum, each consisting of a group of magnets fixed inside and a rotating developing sleeve that magnetizes and transports developer around the outer periphery of the developing roller, The polarity of the magnet group between the developing rollers arranged is such that the magnets located adjacent to the same developing roller have different polarities, and the magnets located facing each other between the two developing rollers also have different polarities. A two-component developing device.