JPS61157966U

JPS61157966U -

Info

Publication number: JPS61157966U
Application number: JP4038285U
Authority: JP
Priority date: 1985-03-20
Filing date: 1985-03-20
Publication date: 1986-09-30

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す説明図、第
２図は第１図のマグネツトロールの着磁装置を示
す説明図、第３図は第１図の磁束密度分布を示す
グラフ、第４図はこの考案の他の実施例を示す説
明図、第５図は第４図の磁束密度分布を示すグラ
フである。１……現像ドラム、２……排磁性体スリーブ、
３，３′……マグネツトロール、４……現像剤、
７……ブレード、８……ピツクアツプ部、９……
厚み規制部、１０……保持部、１１……現像部、
１２……切離し部、１３……第１着磁部、１４…
…第２着磁部、１５……第３着磁部、１６……第
４着磁部、１７……平坦部、１８，１９，２０…
…凹溝。 FIG. 1 is an explanatory diagram showing an embodiment of the invention, FIG. 2 is an explanatory diagram showing the magnet roll magnetization device of FIG. 1, and FIG. 3 is a graph showing the magnetic flux density distribution of FIG. 1. FIG. 4 is an explanatory diagram showing another embodiment of this invention, and FIG. 5 is a graph showing the magnetic flux density distribution of FIG. 4. 1...Developing drum, 2...Magnetic exclusion sleeve,
3, 3′... Magnetrol, 4... Developer,
7...Blade, 8...Pickup section, 9...
Thickness regulation section, 10... Holding section, 11... Development section,
12... Separation part, 13... First magnetized part, 14...
...Second magnetized part, 15...Third magnetized part, 16...Fourth magnetized part, 17...Flat part, 18, 19, 20...
...concave groove.

Claims

【実用新案登録請求の範囲】一方向に回転する現像ドラムと、一方向に回転
する非磁性スリーブと、そのスリーブの中に固定
されたマグネツトロールとを備えた現像装置にお
いて、非磁性体スリーブはその外周部に、現像剤を導
入し吸着するピツクアツプ部と、ブレードによつ
て現像剤の厚みを規制する厚み規制部と、規制さ
れた現像剤を吸着力を減じつつ保持する保持部と
、現像ドラムに近接して現像剤を穂立ちさせる現
像部と、現像剤を離脱する切離し部とを前記順序
で配置し、マグネツトロールは一体成形によつて形成され
その外周面に少なくとも、前記現像部に対向して着磁された第１着磁部と
、前記厚み規制部と前記保持部の中間に対向し前
記第１着磁部に隣接してそれと異極に着磁された
第２着磁部と、前記ピツクアツプ部に対向し前記
第２着磁部に隣接してそれと異極に着磁された第
３着磁部と、前記第１着磁部に隣接してそれと異
極に着磁された第４着磁部を有するとともに、前
記現像部に対向して形成された平坦面と、前記保
持部および前記厚み規制部に対向して各々形成さ
れた凹溝と、前記切離し部に対向して形成された
凹溝又は平坦面とを備えたことを特徴とする現像
装置。[Claims for Utility Model Registration] In a developing device including a developing drum that rotates in one direction, a non-magnetic sleeve that rotates in one direction, and a magnet roll fixed in the sleeve, a non-magnetic sleeve has a pick-up part that introduces and adsorbs the developer, a thickness regulating part that regulates the thickness of the developer with a blade, and a holding part that holds the regulated developer while reducing the adsorption force. A developing section that causes the developer to stand up in the vicinity of the developing drum and a separating section that separates the developer are arranged in the above order, and the magnet roll is formed by integral molding and has at least the above-mentioned developing section on its outer peripheral surface. a first magnetized part that is magnetized opposite to the thickness regulating part; and a second magnetized part that is opposite to the thickness regulating part and the holding part, is adjacent to the first magnetized part, and is magnetized to have a different polarity from the first magnetized part. a third magnetized part that faces the pick-up part, is adjacent to the second magnetized part, and is magnetized to have a different polarity; and a third magnetized part that is adjacent to the first magnetized part and is magnetized to have a different polarity from it. It has a fourth magnetized part, a flat surface formed facing the developing part, a groove formed respectively facing the holding part and the thickness regulating part, and the separating part. A developing device comprising grooves or flat surfaces formed to face each other.