JPS589173A - Magnetic brush developing device - Google Patents

Abstract

PURPOSE:To prevent a developer from backward movement to the surface of a photosensitive drum, by providing a reversal preventive mechanism on the rotary shaft of a rotary drum for a magnetic brush. CONSTITUTION:A case 11 which has stored a developer agitating blade 16 and a magnetic brush rotary drum 15 is guided by a rail 13, and a joint 29 of a shaft to be driven 19 of the rotary drum 15, and a joint 28 of a driving shaft of the machine body frame side are connected. To the rotary drum 15 and the rotary shaft of the agitating blade 16, motive power is transferred by gears 21, 22, but since a one-way clutch 23 is provided between the rotary shaft 20 of the agitating blade 16, and a bearing 18, reversal of the agitating blade 16 and the rotary drum 15 is prevented. Accordingly, backward movement phenomenon of a developer to a photosensitive drum is prevented.

Description

【発明の詳細な説明】 本発明は電子写真複写機等に用いられる磁気ブラシ現像
装ｆＫｆｉｌする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic brush developing device fKfil used in electrophotographic copying machines and the like.

電子写真複写機等に用いられている従来の磁気ブラシ現
像装置は第１図示のような構造をもっている。即ち、感
光体ドラムｌに臨んで位置される磁気ブラシ現侭装置Ａ
は、現像剤Ｔを収容した収容箱コ中に位置される回転ス
リーブ３を有している。そして前記回転スリーブ３の内
部には放射方向へ分極された複数の永久磁石参が内蔵さ
れ、これらの永久磁石参の吸着力によって回転スリーブ
Ｊの局面に吸着される現像剤の厚みｔは、収容箱コの内
部に位置したドクターブレード！によって厚みが調整さ
れる。A conventional magnetic brush developing device used in electrophotographic copying machines and the like has a structure as shown in FIG. That is, the magnetic brush present device A is positioned facing the photoreceptor drum l.
has a rotating sleeve 3 located in a storage box containing developer T. A plurality of permanent magnets polarized in the radial direction are built into the rotary sleeve 3, and the thickness t of the developer that is attracted to the surface of the rotary sleeve J by the attraction force of these permanent magnets is Doctor blade located inside the box! The thickness is adjusted by

ところで、最近の高速型磁気ブラシ現１象装−において
は、近年開発された電気的絶縁性の高いキャリヤを用い
るが、このような高絶縁性現像剤の場合、現像剤の穂ｔ
ｂの厚みも低く１強いては現像載置での感覚体ドラムｌ
と回転スリーブ３０周面間の間隔りはＱ、ｊ〜１．！瓢
といった倣い虻なっている。このため、磁気ブラシ現像
装置Ａを例えば保守管理の際等、回転スリーブＪが不注
意にも逆転されると、ドクターブレード！の直１１ｔＹ
Ｋｆｌ像剤が引掛り、現像剤づまり又は一部分に多歌の
　。By the way, in recent high-speed magnetic brush development systems, recently developed carriers with high electrical insulation properties are used, but in the case of such highly insulating developers, the spikes of the developer
The thickness of b is also low, and 1 is especially important for the sensing body drum l when placing the developer.
and the circumferential surface of the rotating sleeve 30 is Q, j~1. ! It has become a fly that imitates the gourd. Therefore, if the rotating sleeve J is inadvertently reversed during maintenance of the magnetic brush developing device A, the doctor blade! Direct 11tY
The Kfl developer is caught and the developer is clogged or there is a problem with a part of the developer.

現像剤が集積される等の数々の障害を引起こす。This causes a number of problems such as developer accumulation.

ことに、保守管理を容易にするために第１図の紙面と直
角な方向に引出せるようにした磁気ブラフ現像装置（お
いては、装置本体から磁気プラン現像装置を引抜くと、
回転スリーブＪを自由な方向へ回転できる状態になるか
ら、前述したような不注意な回転の０Ｉ能性が高く、や
っかいな事態が発生している。又、前記の如き現像剤が
一部に多量にたまり、そのままの状態で現像を行なうと
現像域ａにおいて前記の現像剤がそのまま感光体ドラム
面ｌに当り現憚剤が下部に落下する。本来、現像装置な
瑣り出し、現像剤を交換し、更に現＃１鉄置を本体に戻
す場合現像剤が複写完了時と同じ状態が望ましい。In particular, in order to facilitate maintenance, the magnetic bluff developing device can be pulled out in a direction perpendicular to the plane of the paper in FIG.
Since the rotary sleeve J can be rotated in any direction, there is a high possibility of inadvertent rotation as described above, resulting in a troublesome situation. Further, if a large amount of the developer as described above accumulates in one part and development is performed in that state, the developer will directly hit the photosensitive drum surface l in the development area a and the developer will fall to the lower part. Originally, when taking out the developing device, replacing the developer, and returning the current #1 iron tray to the main body, it is desirable that the developer be in the same state as when copying is completed.

本発明は１以上に述べたような特に現像用磁気ブラシ面
とＪｆ本体ラム１面の狭い磁気ブラシ現侭装置のｉｌｌ
造的な問題な解決した新たな磁気ブラシ現像装置を提案
するものである。The present invention particularly relates to the illumination of a magnetic brush development device having a narrow magnetic brush surface for development and one surface of the JF main body ram as described above.
This paper proposes a new magnetic brush developing device that solves the structural problems.

以下、第２１Ｖこついて本発明による磁気ブラシ現像装
置の実施例の詳細なＷｆ！、明する。Hereinafter, details of the embodiment of the magnetic brush developing device according to the present invention will be explained with reference to the 21st V! , reveal.

第２図にｇいて、磁気ブラシ現像装置Ａは、現像剤な収
容した収容箱／／を備え、この収容箱／／は機体フレー
に／ＪＫ架設されるレール板１３に沿って滑動的に装置
本体に取付けられる。収容箱ｌｌ中には複数の永久磁石
／ｌを内戚した回転スリーブ／ｊ及びかく伴翼１４が収
容され、これらの回転スリーブ／ｊ及びか〈伴翼／４は
軸受ｉ７．ｔｉＫよって収容箱／／に軸支される。そし
て前記収容ｖｍｔｉから外部に導出されたスリーブ軸ｌ
り及びかく伴動コ０には、相互に噛合された平歯車、２
１．コ一が固定される。As shown in FIG. 2, the magnetic brush developing device A is equipped with a storage box containing a developer. Attached to the main body. A rotary sleeve /j containing a plurality of permanent magnets /l and a wing 14 are housed in the storage box ll, and these rotary sleeves /j and wing 14 are mounted on bearings i7. It is pivotally supported by the storage box // by tiK. And the sleeve shaft l led out from the accommodation vmti
The following drive gear 0 includes mutually meshed spur gears, 2
1. One is fixed.

本発明によれば、前記かく伴動コ。には前記軸受ｌざに
隣合った位＠に一方向りラッチコ３がはめられ、この一
方向クラッチコＪは収容量ｉｉのホス部／／ａ　Ｋ緊密
にはめられることによりかく伴動２゜及びスリーブ軸ｌ
りの逆転を防止する。According to the present invention, the above-mentioned accompanying movement. A one-way latch 3 is fitted in a position adjacent to the bearing l, and this one-way latch J is tightly fitted into the housing portion ii of the housing capacity ii, so that the follower movement 2° and Sleeve shaft l
Prevents reverse rotation.

一方、機体フレーム／Ｊ［は間座コ参で保持される取付
板２ｊが設けられ、この取付板コｊと機体フレームｌコ
の間には駆動チェンコ１によって電動されるスプロケッ
トホイールλ７が回転−■能に支持しである。また、こ
のスブロケットボイール２７九一体に作られた駆ｗＪ＠
軸接手コｌは、スリーブ軸ｌりの軸端の放射方向央起コ
タａをもった従動側軸接手コタに対向される。したがっ
て、磁気ブラ　　　□シ現４ａ装置人が装置本体に完全
に装着されると、駆動側軸接手コｔと従動側軸接手λり
が会合され、スプロケットホイールコアの回転運動をス
リーブ軸ｌデ及びかく伴動２ＯＫ伝えることができる。On the other hand, the fuselage frame /J is provided with a mounting plate 2j held by a spacer, and between this mounting plate j and the fuselage frame l, a sprocket wheel λ7, which is electrically driven by the driving chain 1, is rotated. ■I support Noh. Also, the drive wJ made on this subrocket boiler 279
The shaft joint 1 is opposed to a driven side shaft joint 1 having a radially central radially centered shank a at the shaft end of the sleeve shaft 1. Therefore, when the magnetic brush is completely attached to the main body of the device, the drive-side shaft joint t and the driven-side shaft joint λ are brought together, and the rotational movement of the sprocket wheel core is transferred to the sleeve shaft l and the shaft joint λ. In this way, you can convey the accompaniment 2 OK.

前記実施例装竺は１以上のような構造であるから、スプ
ロケットホイールコアの回転運動は駆動細軸接手２１、
従動−軸接手λりを介してスリーブ軸／ｆＫ伝えられ、
かく伴動２０は平歯車コ１．２２を介して駆動されるこ
とになる。また、前述したようにかく伴動２０　ＶＣは
一方向りラッチコ３が設けられているために、磁気ブラ
シ現１象装置Ａを装置本体から砲外した場合でも、回転
スリーブｔＳを絶対に逆転させることはできない。Since the above-mentioned embodiment structure has one or more structures, the rotational movement of the sprocket wheel core is controlled by the drive thin shaft joint 21,
The sleeve shaft/fK is transmitted via the driven-shaft joint λ,
The follower 20 is thus driven via the spur gear 1.22. In addition, as mentioned above, since the accompaniment 20 VC is provided with the one-way latch control 3, even if the magnetic brush phenomenon device A is removed from the device body, the rotating sleeve tS will absolutely be reversed. It is not possible.

なお、一方向クラッチコ３を組込む位ａは前記実施例に
限定されないのは指摘するまでもない。It goes without saying that the method of incorporating the one-way clutch 3 is not limited to the embodiment described above.

結局、零発ＩＪＫよれば、簡単な構造で、磁気ブラシ現
像装置の不注意な取扱いにより生ずる現像剤づまりによ
り生じる現像剤もれと感光体ドラム面に現像剤の山が当
り癩敢するのを未然に防止することができる。In the end, the zero-start IJK has a simple structure that prevents developer leakage caused by developer clogging caused by careless handling of the magnetic brush developing device, as well as problems caused by developer piles hitting the photoreceptor drum surface. This can be prevented.

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

第１図は従来の磁気ブラシ視像装置の説明図、第２図は
本発明による磁気ブラシ現像装置の駆動部の断面図であ
る。 Ａ・・・磁気ブラシ現像装置、／ｊ・・・回転スリーブ
、ｉｔ・・・か〈伴翼、ｌり・・・スリーブ軸、２０−
、−か〈伴動５．２３・・・一方向クラッチ。FIG. 1 is an explanatory diagram of a conventional magnetic brush visual imaging device, and FIG. 2 is a sectional view of a driving section of a magnetic brush developing device according to the present invention. A...magnetic brush developing device, /j...rotating sleeve, it...or <companion blade, lri...sleeve shaft, 20-
, - or <Accompaniment 5.23...One-way clutch.

Claims (1)

【特許請求の範囲】[Claims] １）回転スリーブの局面にドクターブレードによって規
制された現像剤の穂を形成する磁気ブラシ埃＊ｇ装置に
おいて１回転駆動されることにより前記現像剤を移動さ
せる回転部材の動力伝達系統の一部と装置固定部の関に
逆転止めを設け、前記現會剤の逆方向への移動を阻止し
てなる磁気ブラシ現像装置。1) A part of the power transmission system of a rotating member that moves the developer by being driven once in a magnetic brush dust*g device that forms spikes of developer regulated by a doctor blade on the surface of a rotating sleeve. A magnetic brush developing device in which a reversal stopper is provided at the device fixing portion to prevent the developer from moving in the opposite direction.