JPS6275676A - Developing device for electronic copying machine - Google Patents

Abstract

PURPOSE:To prevent the film thickness of a developer from being ununiform by deformation of a casing, by attaching frames consisting of rigid bodies to both ends of a notch part of the bottom of the casing of a developing device and fixing doctor cuts to frames to seal up contacting positions between frames and the bottom of the casing by elastic seal materials. CONSTITUTION:A casing 3 opened to the upper side face of a photosensitive drum 2 in an upper developing device 1 is arranged, and this casing 3 consists of a casing body 4 with which a side plate part 4a is joined integrally and a cover 5. A notch part 4b is provided just under the side face aperture part of the casing body 4, and a frame 11 whose both ends are fixed to both sides of the lower face of the casing body 4 by screws 10 is arranged. A doctor cut 13 is fixed to the upper face of the frame 11 through screws 12. An elastic seal material 14 is interposed between the rear edge of the frame 11 and the notch end of the casing body 4 in the overlapping face to seal airtightly the overlapping face and direct contacting between the casing body 4 and the frame 11 is avoided, thus preventing the film thickness of the developer from being ununiform by deformation of the casing 3.

Description

【発明の詳細な説明】 ［発明の技術分野］ この発明は、電子複写機、特に現像器のトナー厚みの温
度による部分的不均一の改善に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electronic copying machine, particularly to improvement of local non-uniformity of toner thickness in a developing device due to temperature.

［発明の技術的背景とその問題点］ 一般に電子複写機の現像器のケーシングは合成樹脂成形
体で構成され、感光体ドラムの幅に相当した長さの幅と
なっている。そしてケーシングの開口部に現像スリーブ
を感光体ドラムに回転可能に近接配置している。このス
リーブに対するトナ＃。[Technical Background of the Invention and Problems Therewith] Generally, the casing of the developing device of an electronic copying machine is made of a synthetic resin molded body, and has a length corresponding to the width of the photoreceptor drum. A developing sleeve is rotatably arranged close to the photosensitive drum in the opening of the casing. Tona # for this sleeve.

一膜淳の設定は、２成分現像器の上用搬器の場合、ケー
シングの内底面にドクタカットを取伺け、ドクタカット
の刃先とスリーブ間の隙間をトナー膜厚とし、スリーブ
の回転に伴い余剰現像剤はドクタカットにかき取られる
。In the case of the upper carrier of a two-component developer, Atsushi Ichime's settings are such that a doctor cut is made on the inner bottom surface of the casing, and the gap between the blade edge of the doctor cut and the sleeve is the toner film thickness, and as the sleeve rotates. Excess developer is scraped off by a doctor cut.

この技術にお９プる問題点は、前述の如くケーシングが
合成樹脂製であるため、環境温度変化によりケーシング
が開口縁に沿って上下に反り易く、膜厚が一定とならな
いことである。このため、例えばコピーの周縁が濃く、
中央が薄くなる、あるいはコピーの周縁が薄く中央が濃
くなるなど、濃淡に遍在をぎたす欠点が生じていた。The problem with this technique is that, as mentioned above, since the casing is made of synthetic resin, the casing tends to warp vertically along the opening edge due to environmental temperature changes, and the film thickness is not constant. For this reason, for example, the edges of the copy are dark,
There were ubiquitous defects in shading, such as the center becoming thinner, or the edges of the copy becoming thinner and the center darker.

［発明の目的］ この発明は、環境湿度変化によるドクターとスリーブの
ギャップの変化を防止し、各部均一な膜厚を得て安定し
た画像を得ることを目的とする。[Object of the Invention] The object of the present invention is to prevent the gap between the doctor and the sleeve from changing due to changes in environmental humidity, and to obtain a stable image by obtaining a uniform film thickness at each part.

［発明の概要］ 前記目的を達成するため、この発明では、ケーシング内
底面にドクタカットを備えた現像器において、ケーシン
グの開口部底面を切欠き、該切欠き部分に両端をケーシ
ングの両側にネジ止め固定される剛体からなるフレーム
を取付け、該フレーム上に前記ドクタノＪットを固定す
るとともに、前記フレームとケーシング底部との接触位
置に弾性シール材を介在し、フレームの前記ネジ止め位
置以外をケーシングに対し非接触状態で気密に固定した
ことを特徴とする。[Summary of the Invention] In order to achieve the above object, the present invention provides a developing device having a doctor cut on the inner bottom surface of the casing, in which the bottom surface of the opening of the casing is cut out, and both ends are screwed into the cutout portions on both sides of the casing. A frame made of a rigid body to be fixed is attached, and the Doctor No. J is fixed on the frame, and an elastic sealing material is interposed at the contact position between the frame and the bottom of the casing, and the frame is fixed at a position other than the position where the screws are fixed. It is characterized by being airtightly fixed to the casing in a non-contact state.

［実施例］ 以下、この発明の一実施例を図面を用いて詳細に説明す
る。[Example] Hereinafter, an example of the present invention will be described in detail using the drawings.

第１図はこの発明のを適用した２成分現像器の１現（ｇ
ｌ器１を示寸断面図、第２図は同現像器のケーシングに
対するドクタカットの取付構造を示す分解斜視図である
。FIG. 1 shows one image of a two-component developing device (g
FIG. 2 is an exploded perspective view showing the mounting structure of the doctor cut to the casing of the developing device.

図において、１現搬器１は感光体ドラム２の上部側面に
開口づるケーシング３を備えている。In the figure, a developing device 1 is provided with a casing 3 having an opening on the upper side surface of a photoreceptor drum 2. As shown in FIG.

ケーシング３は、合成樹脂射出成形体からなるもので、
側板部４ａを一体化した上面および一側面を開口したケ
ーシング本体４と、ケーシング本体４の上面開口部に組
付けられたカバー休５とから概略構成されている。The casing 3 is made of a synthetic resin injection molded body,
The casing body 4 is generally composed of a casing body 4 with an integrated side plate portion 4a and an open top surface and one side surface, and a cover rest 5 assembled to the top surface opening of the casing body 4.

ケーシング３の開口部には両端を側板部４ａに回転可能
に枢支された現像スリーブ６が設けられ、その外周を前
記感光体ドラム２の外周に近接位置させている。A developing sleeve 6 is provided in the opening of the casing 3 and has both ends rotatably supported by the side plate portion 4a, and its outer periphery is located close to the outer periphery of the photoreceptor drum 2.

更にケーシング３の内奥部の上部にはトナー補給カート
リッジ７がその下部には攪拌器８が配置され、カートリ
ッジ７から供給されたトナーを攪拌器８の矢印方向の回
転により内部に充填されたキャリヤと混合し、ガイド板
９を通じてスリーブ６の背面に供給するようになってい
る。Furthermore, a toner replenishment cartridge 7 is disposed in the upper part of the inner deep part of the casing 3, and an agitator 8 is disposed in the lower part thereof, and the toner supplied from the cartridge 7 is transferred to the carrier filled inside by rotation of the agitator 8 in the direction of the arrow. and is supplied to the back surface of the sleeve 6 through a guide plate 9.

そして、ケーシング本体４の側面開口部直下の底面部は
切欠かれ、この切欠き部４ｂには両端をビス１０により
ケーシング本体４の両側下面に固定されるフレーム１１
が配置される。The bottom surface of the casing body 4 immediately below the side opening is cut out, and a frame 11 is fixed at both ends to the lower surface of the casing body 4 on both sides with screws 10 in the notch 4b.
is placed.

フレーム１１は、アルミニウム等の異形押出成形体から
なるもので、その上面にはビス１２を介してドクタカッ
ト１３を固定している。またこのフレーム１１の後縁と
ケーシング本体４の切欠端との重合面にはウレタン発泡
体などの弾性シール材１４が介在され、重合面を気密に
シールするとともに、フレーム１１とケーシング本体４
との直接接触を回避している。The frame 11 is made of a profile extrusion molded body of aluminum or the like, and a doctor cut 13 is fixed to the upper surface of the frame 11 via screws 12. Further, an elastic sealing material 14 such as urethane foam is interposed between the rear edge of the frame 11 and the notch end of the casing body 4 to airtightly seal the overlapped surface, and to seal the overlapped surface between the frame 11 and the casing body 4.
Avoiding direct contact with.

以上の構成において、フレーム１１上に固定されたドク
タカット１３の刃先縁とスリーブ６との隙間でトナー厚
みが設定される。In the above configuration, the toner thickness is set in the gap between the blade edge of the doctor cut 13 fixed on the frame 11 and the sleeve 6.

すなわち、スリーブ６は感光体ドラム２の回転方向と同
一の時計方向に回転し、その背面より供給された現像剤
を回転によりドクタカットの刃先縁に接触させることに
より、余分な現像剤は除去される。That is, the sleeve 6 rotates in the same clockwise direction as the rotation direction of the photoreceptor drum 2, and the developer supplied from the back surface of the sleeve 6 is brought into contact with the edge of the blade of the doctor cut, thereby removing excess developer. Ru.

ここで、温度変化により、ケーシング本体４が第２図中
矢印Ａ−Ａの如くその長手方向に対し上向ぎまたは下向
きに反った場合においても、ル−ム１それ自体は剛体で
あるため、初期の設定寸法を維持するため、スリーブ６
とドクタカット１３のギャップは均一に保たれる。また
、反りによる偏位置が最も多いのは中央部分であるが、
これはシール材１４の弾性伸縮により吸収され、シール
竹も保たれることになる。Here, even if the casing main body 4 warps upward or downward with respect to its longitudinal direction as shown by the arrow A-A in FIG. To maintain the initial set dimensions, sleeve 6
The gap between the doctor cut 13 and the doctor cut 13 is kept uniform. In addition, the center part is where the most misalignment due to warpage occurs.
This is absorbed by the elastic expansion and contraction of the sealing material 14, and the seal bamboo is also maintained.

［発明の効果］ 以上実施例により詳細に説明したように、この発明に係
る電子複写機の現像器では、ケーシングの反り等に伴う
現像剤の膜厚不均一がなく、したがって均一な画像を得
られる。また、スリーブとドクタカット間のギャップが
安定しているため、ドクタカットを経て一定膜厚にされ
た後のト犬−の剥落等も一昂でき、周縁を汚損する倶れ
もないものとなる。[Effects of the Invention] As explained in detail in the examples above, in the developing device of the electronic copying machine according to the present invention, there is no unevenness in the film thickness of the developer due to warping of the casing, etc., and therefore a uniform image can be obtained. It will be done. In addition, since the gap between the sleeve and the doctor cut is stable, the peeling off of the dog after the doctor cut to a certain thickness can be prevented, and there is no chance of staining the periphery. .

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

第１図はこの発明を適用した２成分現像器の上現像器を
示す断面図、第２図は同現像器のケーシングに対するド
クタカットの取付構造を示す分解斜視図である。 １・・・上用搬器 ２・・・感光体ドラム ３・・・ケーシング ４・・・ケーシング本体 ４ａ・・・切欠部 ６・・・現像スリーブ １１・・・フレーム １３・・・ドクタカット １４・・・シール材 第１図FIG. 1 is a sectional view showing an upper developing device of a two-component developing device to which the present invention is applied, and FIG. 2 is an exploded perspective view showing a structure for attaching a doctor cut to a casing of the developing device. 1... Upper carrier 2... Photosensitive drum 3... Casing 4... Casing body 4a... Notch 6... Developing sleeve 11... Frame 13... Doctor cut 14...・Seal material diagram 1

Claims (1)

【特許請求の範囲】[Claims] 感光体ドラムの周縁に配置されたケーシングと、ケーシ
ングの開口部にあつて両端をケーシング側部に回転可能
に枢支された現像スリーブと、ケーシング内底面に固定
され、かつ先端縁を前記スリーブに所定のギャップで対
向配置されたドクタカットを備えた現像器において、前
記ケーシングの開口部底面を切欠く該切欠部分に両端を
ケーシングの両端にネジ止め固定される剛体からなるフ
レームを取付け、該フレーム上に前記ドクタカットを固
定するとともに、前記フレームとケーシング底部との接
触位置に弾性シール材を介在し、フレームの前記ネジ止
め位置以外をケーシングに対し非接触状態で気密に固定
したことを特徴とする電子複写機の現像器。a casing disposed around the periphery of the photoreceptor drum; a developing sleeve located in the opening of the casing and rotatably supported at both ends to the sides of the casing; and a developing sleeve fixed to the inner bottom surface of the casing and having a leading edge attached to the sleeve. In a developing device equipped with doctor cuts arranged oppositely with a predetermined gap, a frame made of a rigid body whose both ends are screwed and fixed to both ends of the casing is attached to the notch portion cut out at the bottom of the opening of the casing, the frame The doctor cut is fixed on the top, and an elastic sealing material is interposed at the contact position between the frame and the bottom of the casing, and the frame other than the screwed position is airtightly fixed to the casing in a non-contact state. The developing unit of an electronic copying machine.