JPS642259U

JPS642259U -

Info

Publication number: JPS642259U
Application number: JP9595887U
Authority: JP
Priority date: 1987-06-24
Filing date: 1987-06-24
Publication date: 1989-01-09

Description

[Brief explanation of the drawing]

第１図〜第７図は本考案の実施例を示しており
、第１図は第一実施例に係る現像装置の斜視図、
第２図はその断面図、第３図はその供給ローラの
斜視図、第４図はその断面図を示し、また第５図
及び第６図は第二実施例に係る現像装置における
供給ローラの斜視図、第７図はその断面図をそれ
ぞれ示し、第８図は従来の現像装置を組込んだ複
写機の構成説明図、第９図はその現像装置の部分
拡大断面図、第１０図はその供給ローラの斜視図
を示す。［符号説明］、１……感光ドラム、４……現像
ローラ、５……供給ローラ、１２……支軸、１３
……弾性体層、１４……非多孔質層、１９……ゴ
ム製シート。 1 to 7 show embodiments of the present invention, and FIG. 1 is a perspective view of a developing device according to the first embodiment;
2 is a sectional view thereof, FIG. 3 is a perspective view of the supply roller, and FIG. 4 is a sectional view thereof, and FIGS. 5 and 6 are sectional views of the supply roller in the developing device according to the second embodiment. FIG. 8 is an explanatory diagram of the structure of a copying machine incorporating a conventional developing device, FIG. 9 is a partially enlarged sectional view of the developing device, and FIG. 10 is a perspective view and a sectional view thereof, respectively. A perspective view of the supply roller is shown. [Description of symbols], 1... Photosensitive drum, 4... Developing roller, 5... Supply roller, 12... Support shaft, 13
...Elastic body layer, 14...Non-porous layer, 19...Rubber sheet.

Claims

[Claims for Utility Model Registration] (1) Comprised of a spindle, a porous elastic body fitted onto the spindle, and a non-porous layer coated on the outer circumferential surface of the elastic body. A developer supply roller is provided which is placed in contact with the outer peripheral surface of a developing roller disposed opposite to the image carrier and supplies developer to the developing roller, and the developer is triboelectrically charged by a layer forming member provided on the developing roller. In a non-magnetic one-component developing device that visualizes the electrostatic latent image on the latent image carrier using this developer, the supply roller is provided at both ends to prevent the developer from entering inside the porous elastic body. A non-magnetic one-component developing device characterized by being provided with means for preventing developer from entering. (2) The non-magnetic monocomponent according to claim 1 of the utility model registration claim, wherein the developer intrusion prevention means is constituted by a filler that closes the pores at both ends of the porous elastic body. Developing device. (3) The non-magnetic monocomponent according to claim 1 of the utility model registration claim, wherein the developer intrusion prevention means is constituted by a non-porous member provided on both end sides of the supply roller. Developing device.