JPH052321A - Developing device - Google Patents

Developing device

Info

Publication number
JPH052321A
JPH052321A JP3178914A JP17891491A JPH052321A JP H052321 A JPH052321 A JP H052321A JP 3178914 A JP3178914 A JP 3178914A JP 17891491 A JP17891491 A JP 17891491A JP H052321 A JPH052321 A JP H052321A
Authority
JP
Japan
Prior art keywords
developer
image area
developing sleeve
carrier
supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP3178914A
Other languages
Japanese (ja)
Other versions
JP2999590B2 (en
Inventor
Mitsugi Inomata
貢 猪股
Shigeru Oki
繁 大木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP3178914A priority Critical patent/JP2999590B2/en
Publication of JPH052321A publication Critical patent/JPH052321A/en
Application granted granted Critical
Publication of JP2999590B2 publication Critical patent/JP2999590B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To prevent the flocculated lump of a developer from being formed and to surely execute sealing even when the dispersion of a member is found by supplying the developer to a non-image area less than the image area of a middle part which contributes to forming an image. CONSTITUTION:A scraper blade 5 is allowed to about on the surface of both ends, which slide over the non-image area of a developing sleeve 2 among the surfaces of a supplying and peeling roller disposed to slide over the sleeve 2. Then, a developer supplying means 4 sets so that the developer 3 may be supplied to the non-image area of both ends of the developer carrier 2 which does not contribute to forming the image less than the image area of the middle part of the developer carrier 2 which contributes to forming the image out of the area that the developer 3 is supplied to the developer carrier 2. Therefore, the quantity of the developer around an end sealing member 10 disposed in the non-image area or on the end side further than the non-image area is reduced, and sealing is surely performed even in the case of setting such simple constitution that the end face of the end sealing member 10 is just adhered to the end face of the peripheral member.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、電子写真複写機、静電
記録機、及び磁気記録機等の画像形成装置における現像
装置に関し、特に、現像剤のシール機能を向上させた現
像装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device in an image forming apparatus such as an electrophotographic copying machine, an electrostatic recording machine and a magnetic recording machine, and more particularly to a developing apparatus having an improved developer sealing function.

【0002】[0002]

【従来の技術】従来、乾式の非磁性一成分現像剤を用い
た乾式一成分現像装置としては各種の装置が提案されて
おり、また、実用化されているが、一般的には図8に示
すような構成となっている。つまり、現像剤担持体たる
現像スリーブ2には現像剤容器たるホッパ1内部にて現
像剤供給剥離手段たる供給・剥ぎ取りローラ4が摺擦す
るように配設されており、現像スリーブ2への現像剤3
の供給及び現像スリーブ2上に未現像のまま残存した現
像剤3の剥ぎ取りを行っている。また、上記供給・剥ぎ
取りローラ4と現像スリーブ2との摺擦部よりも該現像
スリーブ2の回転方向下流には、弾性ブレード8が該現
像スリーブ2表面に当接するように配設されている。該
弾性ブレード8は上記供給・剥ぎ取りローラ4により現
像スリーブ2上に供給された現像剤3をその当接部にお
いて均一な薄層形成を行うと共に、現像の際に必要な帯
電量に現像剤3を帯電付与させる。
2. Description of the Related Art Conventionally, various apparatuses have been proposed as a dry type one-component developing apparatus using a dry type non-magnetic one-component developer and have been put into practical use. The configuration is as shown. That is, the developing sleeve 2 serving as a developer carrier is arranged so that the supplying / peeling roller 4 serving as a developer supplying / separating means slides in the hopper 1 serving as a developer container. Developer 3
And the developer 3 left undeveloped on the developing sleeve 2 is peeled off. An elastic blade 8 is arranged so as to contact the surface of the developing sleeve 2 at a position downstream of the sliding portion between the supply / peeling roller 4 and the developing sleeve 2 in the rotation direction of the developing sleeve 2. . The elastic blade 8 forms a uniform thin layer of the developer 3 supplied on the developing sleeve 2 by the supply / peeling roller 4 at its abutting portion, and the developer has a charge amount necessary for development. 3 is charged.

【0003】さらに、以上のような従来例装置において
は、現像スリーブ2両端部に端部シール部材10が取り
付けられており、現像剤漏れを防止している。特に、非
磁性一成分現像剤を使用する場合には、磁性現像剤のよ
うに磁力によって拘束することができないため、現像剤
漏れの防止は重要な課題となっている。図9は従来のシ
ール手法の一例を示す図であり、画像領域よりも広い幅
で形成された現像剤塗布領域の端部にて弾性ブレード8
と端部シール部材10の端面を接触させることによりシ
ールを行っていた。
Further, in the above-mentioned conventional apparatus, the end seal members 10 are attached to both ends of the developing sleeve 2 to prevent the developer from leaking. In particular, when a non-magnetic one-component developer is used, it cannot be constrained by a magnetic force unlike magnetic developers, so that prevention of developer leakage is an important issue. FIG. 9 is a diagram showing an example of a conventional sealing method, in which the elastic blade 8 is formed at the end of the developer application area formed with a width wider than the image area.
The end surface of the end seal member 10 is brought into contact with the end seal member 10 for sealing.

【0004】しかしながら、このようなシール手法にあ
っては、弾性ブレード8あるいは端部シール部材10の
幅、もしくは、弾性ブレード8の取り付け位置に製造上
のばらつきが生じるため、弾性ブレード8と端部シール
部材10とを完全に密着させることができず、両者の間
にわずかな隙間が形成されることがあった。その結果、
現像スリーブ2の回転に伴って現像剤3が漏れるという
問題があった。
However, in such a sealing method, the width of the elastic blade 8 or the end seal member 10 or the mounting position of the elastic blade 8 varies in manufacturing, so that the elastic blade 8 and the end portion are not manufactured. The seal member 10 could not be completely brought into close contact with each other, and a slight gap was sometimes formed between the two. as a result,
There is a problem that the developer 3 leaks as the developing sleeve 2 rotates.

【0005】そこで、図10に示すように端部シール部
材10の弾性ブレード8側の端部を延設し、該延設部分
を弾性ブレード8の裏側(現像スリーブ表面に接触しな
い側)から押し当てることによって端部シール部材10
を弾性ブレード8に密着させる手法が提案された。
Therefore, as shown in FIG. 10, the end portion of the end seal member 10 on the elastic blade 8 side is extended, and the extended portion is pushed from the back side of the elastic blade 8 (the side not contacting the developing sleeve surface). By applying the end seal member 10
A method has been proposed in which the is closely attached to the elastic blade 8.

【0006】[0006]

【発明が解決しようとする課題】しかしながら、上記従
来例によれば、裏側から端部シール部材10に押圧され
た弾性ブレード8の部分は、現像スリーブ2に対する接
触圧が他の部分よりも高くなるため、長期間使用した場
合に当該部分に現像剤3の凝集塊が形成されることがあ
った。その結果、この凝集塊が弾性ブレード8と現像ス
リーブ2の当接部に詰まり、現像スリーブ2上の現像剤
の薄層形成に支障をきたすという問題点があった。
However, according to the above-mentioned conventional example, the portion of the elastic blade 8 pressed from the back side by the end seal member 10 has a higher contact pressure to the developing sleeve 2 than the other portions. Therefore, when used for a long period of time, an aggregate of the developer 3 may be formed in the portion. As a result, there is a problem in that the agglomerates are clogged in the contact portion between the elastic blade 8 and the developing sleeve 2, which hinders the formation of a thin layer of the developer on the developing sleeve 2.

【0007】本発明は、上記問題点を解決し、現像剤の
凝集塊を発生させることなく、また、部材の製造上及び
取り付け上のばらつきがあっても確実にシールを行うこ
とのできる現像装置を提供することを目的としている。
The present invention solves the above-described problems, does not generate agglomerates of the developer, and is capable of reliably sealing even if there are variations in the manufacturing and mounting of the members. Is intended to provide.

【0008】[0008]

【課題を解決するための手段】本発明によれば、上記目
的は、現像剤容器の開口部にて回転自在に配設された現
像剤担持体と、該現像剤担持体の表面に当接するように
配設された弾性ブレードと、該弾性ブレード及び上記現
像剤容器内壁並びに上記現像剤担持体との間に形成され
た上記開口部における隙間をシールする端部シール部材
と、上記現像剤容器内で上記現像剤担持体表面と摺擦す
るように配設され該現像剤担持体への現像剤供給及び該
現像剤担持体からの現像剤剥離を行う現像剤供給剥離手
段とを備えた現像装置において、上記現像剤供給剥離手
段は、上記現像剤担持体へ現像剤を供給する領域のう
ち、画像形成に寄与しない上記現像剤担持体の両端部の
非画像領域への現像剤の供給を、画像形成に寄与する上
記現像剤担持体の中間部の画像領域よりも少なくするよ
うに設定されていることにより達成される。
According to the present invention, the above-mentioned object is to contact a developer carrier rotatably disposed at an opening of a developer container and a surface of the developer carrier. An elastic blade disposed in such a manner, an end seal member that seals a gap in the opening formed between the elastic blade, the inner wall of the developer container, and the developer carrier, and the developer container. And a developer supply / separation unit that is disposed so as to rub against the surface of the developer carrier and supplies the developer to the developer carrier and separates the developer from the developer carrier. In the apparatus, the developer supply / detachment means supplies the developer to the non-image areas at both ends of the developer carrier that do not contribute to image formation in the area where the developer is supplied to the developer carrier. Among the above-mentioned developer carriers that contribute to image formation It is accomplished by being set to less than the image area parts.

【0009】[0009]

【作用】本発明によれば、現像剤供給剥離手段によって
現像剤担持体に現像剤が供給されるが、画像形成に寄与
しない上記現像剤担持体の両端部の非画像領域における
現像剤は、中間部の画像領域よりも少なく供給される。
したがって、上記非画像領域あるいは非画像領域よりも
さらに端部側に配設された端部シール部材周辺の現像剤
量が減少し確実にシールが行われる。
According to the present invention, the developer is supplied to the developer carrier by the developer supplying / peeling means, but the developer in the non-image areas at both ends of the developer carrier which does not contribute to image formation is It is supplied less than the intermediate image area.
Therefore, the amount of the developer around the non-image area or the end seal member arranged further on the end side than the non-image area is reduced, and the sealing is surely performed.

【0010】[0010]

【実施例】本発明の第一実施例ないし第五実施例を図面
に基づいて説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS First to fifth embodiments of the present invention will be described with reference to the drawings.

【0011】〈第一実施例〉先ず、本発明の第一実施例
を図1及び図2に基づいて説明する。図1及び図2は、
本発明を乾式非磁性一成分現像装置に適用した第一実施
例装置の断面図及び平面図である。図1において、1は
現像剤容器たるホッパである。該ホッパ1の開口部に
は、現像剤担持体たる現像スリーブ2が回転自在に支持
されており、駆動源(図示せず)により矢印B方向に回
転駆動される。上記現像スリーブ2は、アルミニウムま
たはステンレス鋼等の非磁性材料製であり、摩擦帯電し
た上記ホッパ1内の一成分非磁性現像剤たる現像剤3を
静電気的引力によってその表面に担持するようになって
いる。
<First Embodiment> First, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 and 2 are
FIG. 1 is a sectional view and a plan view of a first embodiment apparatus in which the present invention is applied to a dry non-magnetic one-component developing apparatus. In FIG. 1, reference numeral 1 is a hopper which is a developer container. A developing sleeve 2, which is a developer carrier, is rotatably supported in the opening of the hopper 1, and is rotationally driven in the direction of arrow B by a drive source (not shown). The developing sleeve 2 is made of a non-magnetic material such as aluminum or stainless steel, and carries the frictionally charged developer 3 which is a one-component non-magnetic developer in the hopper 1 on its surface by electrostatic attraction. ing.

【0012】また、上記現像スリーブ2の下方には、現
像剤供給剥離手段たる供給・剥ぎ取りローラ4が摺擦部
Sで摺擦回転するように配設されている。該供給・剥ぎ
取りローラ4は弾性体で形成されており、上記現像スリ
ーブ2と同方向に回転して現像剤3を該現像スリーブ2
へと供給すると共に該現像スリーブ2と弾性接触するこ
とによって該現像スリーブ2上の現像剤を剥離する。こ
の供給・剥ぎ取りローラ4によって現像剤が供給、剥離
される現像剤塗布領域は、図2に示すように画像領域よ
りも現像スリーブ2の両端部方向に広く形成されてお
り、該画像領域外の非画像領域に対応する上記供給・剥
ぎ取りローラ4の両端部付近には該供給・剥ぎ取りロー
ラ4用の現像剤剥離手段たるスクレーパブレード5が当
接するように配設されている。
Further, below the developing sleeve 2, a supplying / peeling roller 4 as a developer supplying / separating means is arranged so as to rotate by sliding at a sliding portion S. The supply / peeling roller 4 is made of an elastic material, and rotates in the same direction as the developing sleeve 2 so that the developer 3 is transferred to the developing sleeve 2.
The developer on the developing sleeve 2 is peeled off by being supplied to the developing sleeve 2 and making elastic contact with the developing sleeve 2. As shown in FIG. 2, the developer application region where the developer is supplied and peeled by the supply / peeling roller 4 is formed wider in the direction of both ends of the developing sleeve 2 than the image region, and is outside the image region. A scraper blade 5 as a developer stripping means for the supply / stripping roller 4 is disposed so as to abut on both ends of the supply / stripping roller 4 corresponding to the non-image area.

【0013】該スクレーパブレード5は一端を支持部材
6に取り付け、他端を自由端として上記供給・剥ぎ取り
ローラ4の表面に当接部Uにて当接させている。該当接
部Uは上記現像スリーブ2と供給・剥ぎ取りローラ4の
摺擦部Sよりも該供給・剥ぎ取りローラ4の回転方向上
流側に位置しており、該供給・剥ぎ取りローラ4上の非
画像領域に対応する領域の現像剤3を剥ぎ取り、ホッパ
1の現像剤収容部へ現像剤3を落下させている。
One end of the scraper blade 5 is attached to the support member 6, and the other end of the scraper blade 5 is abutted against the surface of the supply / peeling roller 4 at a contact portion U with the other end being a free end. The abutting portion U is located on the upstream side in the rotation direction of the supply / peeling roller 4 with respect to the rubbing portion S between the developing sleeve 2 and the supply / peeling roller 4, and on the supply / peeling roller 4. The developer 3 in the area corresponding to the non-image area is peeled off, and the developer 3 is dropped into the developer accommodating portion of the hopper 1.

【0014】上記スクレーパブレード5によって剥離さ
れた現像剤3を収容する上記供給・剥ぎ取りローラ4の
後方の上記現像剤収容部内には現像剤送り部材7が矢印
D方向に回転するように配設され、現像剤3を上記供給
・剥ぎ取りローラ4へ供給する。しかし上記スクレーパ
ブレード5によって両端部の現像剤3を剥離するので、
供給・剥ぎ取りローラ4上には図2に示す画像領域に対
応する領域のみに現像剤3が保持され、非画像領域に対
応する領域には殆ど現像剤3は存在しない。
A developer feeding member 7 is disposed in the developer accommodating portion behind the supply / peeling roller 4 for accommodating the developer 3 separated by the scraper blade 5 so as to rotate in the direction of arrow D. Then, the developer 3 is supplied to the supply / peeling roller 4. However, since the developer 3 on both ends is peeled off by the scraper blade 5,
On the supply / peeling roller 4, the developer 3 is held only in the area corresponding to the image area shown in FIG. 2, and the developer 3 hardly exists in the area corresponding to the non-image area.

【0015】一方、上記供給・剥ぎ取りローラ4と現像
スリーブ2との摺擦部Sよりも該現像スリーブ2の回転
方向下流側には、弾性ブレード8の自由端が上記現像ス
リーブ2に当接部Tで当接するように配設されており、
該当接部Tにおいて上記現像スリーブ2上の現像剤3の
通過を規制している。上記弾性ブレード8には、所望の
極性に現像剤3を帯電するのに適した摩擦帯電系列の材
質のものを用いることが好ましい。例えば、ポリエステ
ルを組成成分とする現像剤を負に帯電させるにはナイロ
ン、ポリウレタン、スチレンブタジエン等を用いればよ
い。以上のような材質を用いれば現像剤の摩擦帯電効率
をより高くすることができる。
On the other hand, the free end of the elastic blade 8 is in contact with the developing sleeve 2 on the downstream side in the rotational direction of the developing sleeve 2 with respect to the sliding portion S between the supplying / peeling roller 4 and the developing sleeve 2. It is arranged so as to abut at the section T,
At the contact portion T, the passage of the developer 3 on the developing sleeve 2 is regulated. As the elastic blade 8, it is preferable to use a material of frictional charging series suitable for charging the developer 3 to a desired polarity. For example, nylon, polyurethane, styrene butadiene, or the like may be used to negatively charge the developer containing polyester as a constituent component. By using the above materials, the triboelectrification efficiency of the developer can be further increased.

【0016】また、現像スリーブ2の下方には該現像ス
リーブ2とホッパ1の開口部との隙間を塞ぐシール部材
9が配設されている。該シール部材9はマイラー(デュ
ポン社製商品名)等の可撓性シートで形成されており、
屈曲された状態で一端部が上記現像スリーブ2の下方表
面に当接するようになっている。
Below the developing sleeve 2, a seal member 9 for closing the gap between the developing sleeve 2 and the opening of the hopper 1 is arranged. The seal member 9 is formed of a flexible sheet such as Mylar (trade name of DuPont),
One end of the bent sleeve contacts the lower surface of the developing sleeve 2.

【0017】以上のように、上方に弾性ブレード8、下
方にシール部材9を当接させた現像スリーブ2の両端部
には端部シール部材10が配設されており、軸方向にお
ける現像剤の漏れを防止している。該端部シール部材1
0は弾性部材で形成されており、ホッパ1内に突入させ
た現像スリーブ2の表面と周方向にて摺接するようにな
っている。上記端部シール部材10は、現像スリーブ2
の長手方向において上述した現像剤塗布領域よりも外側
に配設されており、該現像剤塗布領域との境界位置にて
図9に示す従来例のように該端部シール部材10の側部
端面と弾性ブレード8、シール部材9の側部端面とが接
触するようになっている。
As described above, the end seal members 10 are arranged at both ends of the developing sleeve 2 with which the elastic blade 8 is in contact with the upper side and the seal member 9 is in contact with the lower side. Prevents leakage. The end seal member 1
Reference numeral 0 denotes an elastic member, which is slidably contacted in the circumferential direction with the surface of the developing sleeve 2 projecting into the hopper 1. The end seal member 10 is the developing sleeve 2
Of the side end face of the end seal member 10 at the boundary position with the developer application region as in the conventional example shown in FIG. The elastic blade 8 and the side end surface of the seal member 9 are in contact with each other.

【0018】以上のような現像装置において、図1に示
す現像剤送り部材7が矢印D方向の回転によって現像剤
3を供給・剥ぎ取りローラ4側へ搬送すると、該現像剤
3は該供給・剥ぎ取りローラ4に該供給・剥ぎ取りロー
ラ4の長手方向全域に亘って担持される。担持された現
像剤3は上記供給・剥ぎ取りローラ4の矢印C方向の回
転によって現像スリーブ2との摺擦部Sへと搬送される
が、この際、供給・剥ぎ取りローラ4に担持された現像
剤3のうち非画像領域に担持されたものはスクレーパブ
レード5の当接部Uにて剥ぎ取られる。したがって、上
記摺擦部Sにおいては、画像領域にのみ現像剤3が供給
され、非画像領域には供給されない。
In the developing device as described above, when the developer feeding member 7 shown in FIG. 1 is rotated in the direction of arrow D to convey the developer 3 to the supply / peeling roller 4 side, the developer 3 is supplied / supplied. The peeling roller 4 is carried over the entire area of the supply / peeling roller 4 in the longitudinal direction. The carried developer 3 is conveyed to the rubbing portion S with the developing sleeve 2 by the rotation of the supply / peeling roller 4 in the direction of the arrow C. At this time, the developer 3 was carried by the supply / peeling roller 4. The developer 3 carried on the non-image area is peeled off at the contact portion U of the scraper blade 5. Therefore, in the rubbing portion S, the developer 3 is supplied only to the image area and is not supplied to the non-image area.

【0019】上記摺擦部Sで現像スリーブ2と摺擦され
て摩擦帯電を受けた画像領域の現像剤3は、現像スリー
ブ2の矢印B方向の回転によって弾性ブレード8の当接
部Tへと搬送されるが、弾性ブレード8と現像スリーブ
2との当接部Tを通過するときに、現像スリーブ2表面
と弾性ブレード8によって摺擦され、さらに摩擦帯電を
受ける。このようにして現像剤3は十分な摩擦帯電を受
けることができる。
The developer 3 in the image area which has been frictionally charged by being slid on the developing sleeve 2 at the sliding portion S is moved to the contact portion T of the elastic blade 8 by the rotation of the developing sleeve 2 in the direction of arrow B. While being conveyed, when it passes through the contact portion T between the elastic blade 8 and the developing sleeve 2, the surface of the developing sleeve 2 is rubbed by the elastic blade 8 and further frictionally charged. In this way, the developer 3 can receive sufficient triboelectrification.

【0020】この十分な摩擦帯電を受けた現像剤3は上
記当接部Tを通過して現像スリーブ2上の現像剤薄層と
して形成され、現像スリーブ2上を感光ドラム(図示せ
ず)と対向する現像部へ運ばれる。また、上記当接部T
を通過する現像剤3は、上述したように殆どが画像領域
に存在し、非画像領域には極くわずかしか存在しない。
したがって、端部シール部材10周辺の現像剤量も少な
くなるので、シール動作が確実に行われる。
The developer 3 which has received the sufficient frictional charge passes through the abutting portion T and is formed as a thin developer layer on the developing sleeve 2, and the developing sleeve 2 serves as a photosensitive drum (not shown). It is transported to the opposite developing section. In addition, the contact portion T
As described above, most of the developer 3 that passes through is present in the image area and very little is present in the non-image area.
Therefore, the amount of the developer around the end seal member 10 is also reduced, so that the sealing operation is reliably performed.

【0021】一方、現像部において、一部の現像剤は現
像動作により消費され、他の現像剤は現像スリーブ2の
回転と共に現像スリーブ2の下部より回収される。この
回収部分にはシール部材9が設けられ現像で消費されな
かった現像剤のホッパ1内への通過を許容すると共に、
ホッパ1内の現像剤3がホッパ1の下部から漏出するこ
とを防止する。回収された現像スリーブ2上の現像剤は
供給・剥ぎ取りローラ4と現像スリーブ2との摺擦部S
で弾性接触によって掻き落とされる。この掻き落とされ
た現像剤3は、トナー送り部材7によって搬送された現
像剤3と合流し、再び上述したように摺擦部Sへと搬送
される。
On the other hand, in the developing section, a part of the developer is consumed by the developing operation, and the other developer is collected from the lower part of the developing sleeve 2 as the developing sleeve 2 rotates. A seal member 9 is provided in this collecting portion to allow passage of the developer not consumed in the development into the hopper 1, and
The developer 3 in the hopper 1 is prevented from leaking from the lower part of the hopper 1. The collected developer on the developing sleeve 2 is rubbed by the supplying / peeling roller 4 and the developing sleeve 2.
It is scraped off by elastic contact. The developer 3 scraped off merges with the developer 3 carried by the toner feeding member 7, and is carried to the rubbing portion S again as described above.

【0022】このように、本実施例装置によれば、現像
スリーブ2上の現像剤3の存在領域を画像領域に制限
し、端部シール部材10周辺の現像剤を著しく減少させ
ることができるので、シール手法として図9に示す従来
のものを用いた場合であっても画像に悪影響を与えるこ
となく確実なシール動作を実現できる。したがって、従
来のような現像剤の凝集塊を発生させることがなく、弾
性ブレード8による現像剤の薄層形成を安定して行うこ
とができる。さらに、部材の製造上もしくは取り付け上
のばらつきが多少あったとしても上述のように端部シー
ル部材10周辺の現像剤が極くわずかなので確実にシー
ル動作を行うことができる。
As described above, according to the apparatus of this embodiment, the area where the developer 3 is present on the developing sleeve 2 is limited to the image area, and the developer around the end seal member 10 can be significantly reduced. Even if the conventional sealing method shown in FIG. 9 is used, a reliable sealing operation can be realized without adversely affecting the image. Therefore, it is possible to stably form a thin layer of the developer by the elastic blade 8 without generating an aggregate of the developer as in the conventional case. Further, even if there are some variations in the manufacturing or mounting of the members, as described above, the developer around the end seal member 10 is extremely small, so that the sealing operation can be surely performed.

【0023】〈第二実施例〉次に、本発明の第二実施例
を図3及び図4に基づいて説明する。なお、第一実施例
との共通箇所には同一符号を付して説明を省略する。
<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

【0024】図3は本実施例の概略構成を示す断面図、
図4はその平面図である。本実施例は、図3及び図4に
示すようにスクレーパブレード5の代わりにスクレーパ
ローラ11を用いたところが第一実施例と異なる。
FIG. 3 is a sectional view showing a schematic structure of this embodiment,
FIG. 4 is a plan view thereof. This embodiment differs from the first embodiment in that a scraper roller 11 is used instead of the scraper blade 5 as shown in FIGS. 3 and 4.

【0025】スクレーパブレードは耐久が進むにつれて
ブレードエッジの欠けを起こしたり、エッジ部で現像剤
融着が発生したりしてスクレープ不良を生じることがあ
った。しかしながら、本実施例によれば、長期間に亘る
使用においてもスクレープ不良を発生させずに常に安定
して供給・剥ぎ取りローラ4上の非画像領域に相当する
領域の現像剤をスクレープすることができる。その結
果、高いシール効果を維持することができる。
With the scraper blade, as the endurance of the scraper was increased, the blade edge was chipped or the developer was fused at the edge portion, resulting in scraping failure. However, according to the present embodiment, it is possible to always stably scrape the developer in the area corresponding to the non-image area on the supply / peel roller 4 without causing scraping failure even during long-term use. it can. As a result, a high sealing effect can be maintained.

【0026】〈第三実施例〉次に、本発明の第三実施例
を図5に基づいて説明する。なお、第一実施例との共通
箇所には同一符号を付して説明を省略する。
<Third Embodiment> Next, a third embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

【0027】本実施例は、図5に示すように、スクレー
パブレード5を設けることなく、供給・剥ぎ取りローラ
4の非画像領域に対応する両端部における外径を、画像
領域に対応する中央部の外径よりも小さくしたところが
第一実施例と異なる。
In this embodiment, as shown in FIG. 5, the scraper blade 5 is not provided, and the outer diameters of both ends of the feeding / peeling roller 4 corresponding to the non-image area are set to the central portion corresponding to the image area. The difference from the first embodiment is that the outer diameter is smaller than the outer diameter.

【0028】現像スリーブ2への現像剤の塗布量は、現
像スリーブ2と供給・剥ぎ取りローラ4との間の圧力及
びニップ幅により左右されるので、本実施例のように非
画像領域に対応する領域の外径を小さくすれば、上記圧
力及びニップ幅が小さくなり、当該非画像領域への現像
剤の塗布量を少なくすることができる。したがって、端
部シール部材周辺の現像剤量を減少させ確実なシール動
作を実現できる。
The amount of developer applied to the developing sleeve 2 depends on the pressure between the developing sleeve 2 and the supply / peeling roller 4 and the nip width, so that it corresponds to the non-image area as in this embodiment. If the outer diameter of the area to be filled is reduced, the pressure and the nip width are reduced, and the amount of developer applied to the non-image area can be reduced. Therefore, the amount of the developer around the end seal member can be reduced and a reliable sealing operation can be realized.

【0029】〈第四実施例〉次に、本発明の第四実施例
を図6に基づいて説明する。なお、第一実施例との共通
箇所には同一符号を付して説明を省略する。
<Fourth Embodiment> Next, a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

【0030】本実施例は、図6に示すように、供給・剥
ぎ取りローラ4の非画像領域に対応する両端部における
材質自体あるいはその表面等の処理を画像領域に対応す
る中央部と異なったものとしたところが第一実施例と異
なる。なお、第三実施例と同様にスクレーパブレード5
も設けられていない。
In the present embodiment, as shown in FIG. 6, the processing of the material itself or its surface at both end portions corresponding to the non-image area of the supply / peeling roller 4 is different from that at the central portion corresponding to the image area. This is different from the first embodiment. In addition, the scraper blade 5 is used as in the third embodiment.
Is not provided.

【0031】例えば、供給・剥ぎ取りローラ4に発泡体
を用いた場合には、上記両端部における単位体積当りの
気泡部の数(以下、セル数とする)を中央部より少なく
する。その結果、現像スリーブ2への現像剤の供給量
は、単位体積当りのセル数の多い中央部に比べて少なく
なるので、端部シール部材10周辺の現像剤量を減少さ
せて第一実施例と同様の効果を生ずる。また、現像剤は
現像スリーブ2と供給・剥ぎ取りローラ4との間で擦ら
れて摩擦帯電され、静電気的引力によって現像スリーブ
2に塗布されるものであるから、上記両端部の発泡体の
材質を現像剤への摩擦帯電による電荷の付与の小さい材
質としても良い。さらに、上記両端部の発泡体のみ熱に
よって表面を溶かし、その現像剤塗布性能を低下させて
も良い。
For example, when a foam is used for the supply / peeling roller 4, the number of bubble portions per unit volume (hereinafter referred to as the number of cells) at both ends is smaller than that at the central portion. As a result, the amount of developer supplied to the developing sleeve 2 is smaller than that in the central portion where the number of cells per unit volume is large, so that the amount of developer around the end seal member 10 is reduced and the first embodiment is performed. Produces the same effect as. Further, the developer is rubbed between the developing sleeve 2 and the supply / peeling roller 4 to be triboelectrically charged, and is applied to the developing sleeve 2 by electrostatic attraction. May be made of a material that gives a small amount of charge to the developer by frictional charging. Furthermore, the surface of the foamed material at both ends may be melted by heat to reduce the developer coating performance.

【0032】〈第五実施例〉次に、本発明の第五実施例
を図7に基づいて説明する。なお、第一実施例との共通
箇所には同一符号を付して説明を省略する。
<Fifth Embodiment> Next, a fifth embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

【0033】本実施例は、図7に示すように、非画像領
域に対応する供給・剥ぎ取りローラ4の両端部を、軸1
2の周りに回転自在な別部材13として構成したところ
が第一実施例と異なる。該部材13は内周の軸受部14
と外周の発泡体15とから構成される。
In this embodiment, as shown in FIG. 7, both ends of the supply / peeling roller 4 corresponding to the non-image area are connected to the shaft 1.
It is different from the first embodiment in that it is configured as a separate member 13 rotatable around 2. The member 13 is a bearing portion 14 on the inner circumference.
And the outer peripheral foam body 15.

【0034】画像領域に対応する供給・剥ぎ取りローラ
4の中央部は軸12によって現像スリーブ2の回転方向
と同じ方向であるカウンタ方向に回転するが、上記部材
13は上記現像スリーブ2との当接によって従動回転す
る。したがって、現像剤を摩擦帯電させたり、擦り付け
ることがなく、現像スリーブ2の非画像領域への現像剤
供給量が減少するため、端部シール部材10周辺の現像
剤量を減少させ、確実なシール動作を行うことができ
る。
The central portion of the supply / peeling roller 4 corresponding to the image area is rotated by the shaft 12 in the counter direction which is the same direction as the rotation direction of the developing sleeve 2, but the member 13 contacts the developing sleeve 2. It rotates driven by contact. Therefore, the developer supply amount to the non-image area of the developing sleeve 2 is reduced without frictionally charging or rubbing the developer, so that the developer amount around the end seal member 10 is reduced and a reliable seal is obtained. You can take action.

【0035】[0035]

【発明の効果】以上説明したように、本発明によれば、
現像剤供給剥離手段は、画像形成に寄与しない現像剤担
持体の両端部の非画像領域への現像剤の供給を、中間部
の画像領域よりも少なくするように設定されているの
で、端部シール部材周辺の現像剤量が減少し、端部シー
ル部材の端面を周囲の部材の端面に密着させるだけの簡
単な構成とした場合でも確実なシール動作を行うことが
でき、現像剤の凝集塊を発生させることがない。また、
部材の製造上あるいは取り付け上のばらつきが多少あっ
たとしても、十分にシール効果を発揮することができ
る。
As described above, according to the present invention,
The developer supply / separation means is set so that the supply of the developer to the non-image areas at both ends of the developer carrier that does not contribute to image formation is set to be smaller than that in the image area at the intermediate portion. The amount of developer around the seal member decreases, and a reliable sealing operation can be performed even with a simple structure in which the end face of the end seal member is brought into close contact with the end faces of the surrounding members. Does not occur. Also,
Even if there is some variation in manufacturing or mounting of the members, the sealing effect can be sufficiently exerted.

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

【図1】本発明の第一実施例装置の概略構成を示す断面
図である。
FIG. 1 is a sectional view showing a schematic configuration of a first embodiment device of the present invention.

【図2】図1装置の平面図である。FIG. 2 is a plan view of the device of FIG.

【図3】本発明の第二実施例装置の概略構成を示す断面
図である。
FIG. 3 is a cross-sectional view showing a schematic configuration of a second embodiment device of the present invention.

【図4】図3装置の平面図である。FIG. 4 is a plan view of the device of FIG.

【図5】本発明の第三実施例における現像剤供給剥離手
段の平面図及び正面図である。
5A and 5B are a plan view and a front view of a developer supply / separation unit according to a third embodiment of the invention.

【図6】本発明の第四実施例における現像剤供給剥離手
段の平面図及び正面図である。
6A and 6B are a plan view and a front view of a developer supply / separation unit according to a fourth embodiment of the present invention.

【図7】本発明の第五実施例における現像剤供給剥離手
段の平面図及び斜視図である。
FIG. 7 is a plan view and a perspective view of a developer supply / separation unit according to a fifth embodiment of the present invention.

【図8】従来例装置の概略構成を示す断面図である。FIG. 8 is a cross-sectional view showing a schematic configuration of a conventional device.

【図9】従来例装置におけるシール手法を説明するため
の断面図である。
FIG. 9 is a cross-sectional view for explaining a sealing method in a conventional device.

【図10】従来例装置における他のシール手法を説明す
るための断面図である。
FIG. 10 is a cross-sectional view for explaining another sealing method in the conventional device.

【符号の説明】[Explanation of symbols]

1 現像剤容器(ホッパ) 2 現像剤担持体(現像スリーブ) 3 現像剤 4 現像剤供給剥離手段(供給・剥ぎ取りローラ) 8 弾性ブレード 10 端部シール部材 1 Developer container (hopper) 2 Developer support (development sleeve) 3 developer 4 Developer supply peeling means (supply / peeling roller) 8 elastic blades 10 End seal member

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 現像剤容器の開口部にて回転自在に配設
された現像剤担持体と、該現像剤担持体の表面に当接す
るように配設された弾性ブレードと、該弾性ブレード及
び上記現像剤容器内壁並びに上記現像剤担持体との間に
形成された上記開口部における隙間をシールする端部シ
ール部材と、上記現像剤容器内で上記現像剤担持体表面
と摺擦するように配設され該現像剤担持体への現像剤供
給及び該現像剤担持体からの現像剤剥離を行う現像剤供
給剥離手段とを備えた現像装置において、上記現像剤供
給剥離手段は、上記現像剤担持体へ現像剤を供給する領
域のうち、画像形成に寄与しない上記現像剤担持体の両
端部の非画像領域への現像剤の供給を、画像形成に寄与
する上記現像剤担持体の中間部の画像領域よりも少なく
するように設定されていることとする現像装置。
1. A developer carrying member rotatably arranged at an opening of a developer container, an elastic blade arranged so as to abut a surface of the developer carrying member, and the elastic blade, An end seal member that seals a gap in the opening formed between the inner wall of the developer container and the developer carrier, and so as to rub against the surface of the developer carrier in the developer container. In a developing device, which is provided with a developer supply / peel means for supplying the developer to the developer carrier and for peeling the developer from the developer carrier, the developer supply / peel means is the developer. Among the regions for supplying the developer to the carrier, the developer is supplied to the non-image regions at both ends of the developer carrier which do not contribute to image formation, and the intermediate part of the developer carrier that contributes to image formation. Is set to be less than the image area of Developing device.
【請求項2】 現像剤担持体の非画像領域と摺擦する現
像剤供給剥離手段の両端部表面には現像剤剥離手段が当
接するように配設されていることとする請求項1に記載
の現像装置。
2. The developer peeling means is disposed so as to abut on both end surfaces of the developer supply peeling means that slides against the non-image area of the developer carrying member. Developing device.
【請求項3】 現像剤担持体の非画像領域と摺擦する現
像剤供給剥離手段の両端部の外径を中間部よりも小さく
したこととする請求項1に記載の現像装置。
3. The developing device according to claim 1, wherein the outer diameters of both ends of the developer supplying / separating means that rubs against the non-image area of the developer carrying member are smaller than the intermediate portion.
【請求項4】 現像剤担持体の非画像領域と摺擦する現
像剤供給剥離手段の両端部を、中間部と異なる部材で形
成するか、あるいは、表面または全体に中間部のものと
は異なった処理を施した部材で形成することにより、上
記両端部における現像剤保持量が上記中間部より少なく
なるように設定されていることとする請求項1に記載の
現像装置。
4. The developer supply / peel means for rubbing against the non-image area of the developer carrier is formed with a member different from the intermediate part, or different from the intermediate part on the surface or on the whole. 2. The developing device according to claim 1, wherein the developer holding amount at the both end portions is set to be smaller than that at the intermediate portion by being formed of a member subjected to the above treatment.
【請求項5】 現像剤担持体の非画像領域と摺擦する現
像剤供給剥離手段の両端部を、中間部と独立に現像剤担
持体と従動回転するように構成したこととする請求項1
に記載の現像装置。
5. The developer supply / peel means for rubbing against the non-image area of the developer carrier is constituted so that both ends thereof are driven to rotate independently of the intermediate part.
The developing device according to 1.
JP3178914A 1991-06-25 1991-06-25 Developing device Expired - Fee Related JP2999590B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3178914A JP2999590B2 (en) 1991-06-25 1991-06-25 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3178914A JP2999590B2 (en) 1991-06-25 1991-06-25 Developing device

Publications (2)

Publication Number Publication Date
JPH052321A true JPH052321A (en) 1993-01-08
JP2999590B2 JP2999590B2 (en) 2000-01-17

Family

ID=16056871

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3178914A Expired - Fee Related JP2999590B2 (en) 1991-06-25 1991-06-25 Developing device

Country Status (1)

Country Link
JP (1) JP2999590B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592268A (en) * 1994-07-22 1997-01-07 Brother Kogyo Kabushiki Kaisha Mechanism to prevent toner leakage from an image forming unit
JP2007101595A (en) * 2005-09-30 2007-04-19 Brother Ind Ltd Developing device, process cartridge and image forming apparatus
CN102076802A (en) * 2009-04-30 2011-05-25 日东电工株式会社 Adhesive composition for optical film, adhesive layer for optical film, and adhesive optical film, and image display device
DE102016105630A1 (en) 2015-04-01 2016-10-06 Central Motor Wheel Co., Ltd. cap

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592268A (en) * 1994-07-22 1997-01-07 Brother Kogyo Kabushiki Kaisha Mechanism to prevent toner leakage from an image forming unit
JP2007101595A (en) * 2005-09-30 2007-04-19 Brother Ind Ltd Developing device, process cartridge and image forming apparatus
CN102076802A (en) * 2009-04-30 2011-05-25 日东电工株式会社 Adhesive composition for optical film, adhesive layer for optical film, and adhesive optical film, and image display device
CN103122227A (en) * 2009-04-30 2013-05-29 日东电工株式会社 Adhesive composition for optical film, adhesive layer for optical film, and adhesive optical film, and image display device
DE102016105630A1 (en) 2015-04-01 2016-10-06 Central Motor Wheel Co., Ltd. cap

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