JPH0540399A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH0540399A JPH0540399A JP3196698A JP19669891A JPH0540399A JP H0540399 A JPH0540399 A JP H0540399A JP 3196698 A JP3196698 A JP 3196698A JP 19669891 A JP19669891 A JP 19669891A JP H0540399 A JPH0540399 A JP H0540399A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- developing sleeve
- thin layer
- forming body
- developing device
- 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.)
- Pending
Links
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、電子写真式画像形成装
置に供される像担持体上の潜像の現像に適用される現像
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device applied to the development of a latent image on an image carrier used in an electrophotographic image forming apparatus.
【0002】[0002]
【従来の技術】感光体などの像担持体上に形成された潜
像を、1成分または2成分現像剤を用いて接触または非
接触現像方式の現像を行なう電子写真式画像形成装置に
おいては、良好な画像を得るために、現像剤担持体(現
像スリーブ)上の現像剤の層厚は薄く、しかも均一にす
ることが必要である。図10に示す様に現像スリーブ2は
感光体である像担持体1に若干の隙間を設けて対峙して
いる。そして図10の(a),(b),(c)に示す様に、
現像スリーブに層厚の規制を行なう現像剤量規制体31
(薄層形成体)を押圧している。2. Description of the Related Art In an electrophotographic image forming apparatus for developing a latent image formed on an image bearing member such as a photosensitive member by a contact or non-contact developing method using a one-component or two-component developer, In order to obtain a good image, it is necessary that the layer thickness of the developer on the developer carrying member (developing sleeve) is thin and uniform. As shown in FIG. 10, the developing sleeve 2 faces the image carrier 1, which is a photoconductor, with a slight gap. Then, as shown in (a), (b), and (c) of FIG.
A developer amount regulator 31 that regulates the layer thickness of the developing sleeve.
(Thin layer forming body) is pressed.
【0003】図10(a)は、磁性材より成る丸棒材の薄
層形成体31を現像スリーブ2内に設けた磁石体の磁力に
より現像スリーブ2に押圧する方式のものを示してい
る。FIG. 10A shows a system in which a thin layer forming body 31 of a round bar made of a magnetic material is pressed against the developing sleeve 2 by the magnetic force of a magnet provided inside the developing sleeve 2.
【0004】図10(b)は、上記図10(a)の方式に更
に弾性部材4の押圧力が薄層形成体31に加わる方式のも
のである。FIG. 10 (b) shows a system in which the pressing force of the elastic member 4 is applied to the thin layer forming body 31 in addition to the system of FIG. 10 (a).
【0005】図10(c)は、薄層形成体31がゴム板又は
金属ばね板等のばね板材で出来ており、その弾性により
現像スリーブ2に押圧する方式のものである。FIG. 10C shows a system in which the thin layer forming body 31 is made of a spring plate material such as a rubber plate or a metal spring plate, and is pressed against the developing sleeve 2 by its elasticity.
【0006】現像スリーブ2の表面は現像剤Dの搬送性
である担持性を向上するため、不定形ブラスト処理の例
えばサンドブラスト処理により表面に細かい凹凸を作っ
てある。サンドブラスト処理は周知の様に不定形の砂の
粒子を高速で吹き付けて金属表面に細かい凹凸を作るも
のである。現像スリーブ2の表面をこの様な表面状態と
する事と後述の電気力と磁気力により現像剤Dは現像ス
リーブ2の表面に付着し搬送され、像担持体1と対峙す
る狭い間隙部に形成される現像領域において像担持体1
に形成されている潜像を現像することになる。In order to improve the carrying property of the developer D, which is the transportability of the developer D, the surface of the developing sleeve 2 is formed with fine irregularities by an irregular blasting process such as a sand blasting process. As is well known, the sandblast treatment is to spray irregularly shaped sand particles at high speed to form fine irregularities on the metal surface. By making the surface of the developing sleeve 2 in such a surface state and by the electric force and magnetic force described later, the developer D is attached to the surface of the developing sleeve 2 and conveyed, and is formed in a narrow gap portion facing the image carrier 1. Image carrier 1 in the developed area
The latent image formed on is developed.
【0007】像担持体1に形成された潜像を現像するた
めには現像剤Dを帯電させる必要がある。そのためには
2成分現像剤の場合は、現像剤槽5の中に設けた現像剤
の撹拌装置(図示せず)により現像剤Dを撹拌し、現像
剤相互の摩擦により現像剤は帯電される様になってい
る。現像スリーブ2には、良好な画像を得るため上記の
様に薄層形成体31を押圧して現像剤の層厚を薄く、均一
になる様にしているが、1成分現像剤の場合は薄層形成
体31と現像スリーブ2の間を現像剤が通り抜ける時の摩
擦によって現像剤は帯電されるようになっている。In order to develop the latent image formed on the image carrier 1, it is necessary to charge the developer D. To this end, in the case of a two-component developer, the developer D is stirred by a developer stirring device (not shown) provided in the developer tank 5, and the developer is charged by friction between the developers. It is like this. In order to obtain a good image on the developing sleeve 2, the thin layer forming body 31 is pressed as described above so that the layer thickness of the developer is thin and uniform, but in the case of a one-component developer, it is thin. The developer is charged by friction when the developer passes between the layer forming body 31 and the developing sleeve 2.
【0008】[0008]
【発明が解決しようとする課題】上記の様に現像スリー
ブの表面の現像剤層を薄く均一にし、且つ1成分現像剤
の場合は現像剤を帯電させるためにも薄層形成体を現像
スリーブに押圧しているが、特に現像剤の帯電量を充分
に得るために薄層形成体を現像スリーブに強く押圧して
いた。現像スリーブは通常アルミニウム合金とか真鍮と
いった非磁性の比較的に柔らかい金属材料で出来てい
る。そして現像スリーブの表面は上で述べた様に現像剤
の搬送性向上のため、例えばサンドブラスト処理の様な
ブラスト処理を行っており、表面には細かい凹凸が出来
ている。従ってこの様な現像スリーブの表面に薄層形成
体を強く押圧することは現像スリーブの表面は摩耗を強
いられることになった。このため現像スリーブの表面の
現像剤搬送性は劣化して現像剤搬送量は減少することに
なり、画像濃度は低下することとなった。As described above, in order to make the developer layer on the surface of the developing sleeve thin and uniform, and in the case of a one-component developer, the thin layer forming body is applied to the developing sleeve in order to charge the developer. Although pressed, the thin layer forming body was strongly pressed against the developing sleeve in order to obtain a sufficient charge amount of the developer. The developing sleeve is usually made of a non-magnetic, relatively soft metallic material such as aluminum alloy or brass. As described above, the surface of the developing sleeve is subjected to a blasting process such as a sandblasting process in order to improve the transportability of the developer, and the surface has fine irregularities. Therefore, if the thin layer forming body is strongly pressed against the surface of the developing sleeve, the surface of the developing sleeve is subject to abrasion. For this reason, the developer transport property on the surface of the developing sleeve is deteriorated, the developer transport amount is reduced, and the image density is reduced.
【0009】また、上記の様に現像スリーブに薄層形成
体を強く押圧していたため、現像スリーブと薄層形成体
の隙間は非常に小さくなり、この隙間を通過する現像剤
は、現像剤が粉体であるため一つ一つの粉体の表面が損
傷を受ける形となり、粉体の表面に塗布されていた例え
ば流動性向上のための添加剤がはげ落ちる等して現像剤
としての性能が劣化する様な状況が生じていた。Further, since the thin layer forming body is strongly pressed against the developing sleeve as described above, the gap between the developing sleeve and the thin layer forming body becomes very small, and the developer passing through this gap is not the developer. Since it is a powder, the surface of each powder will be damaged, and the performance of the developer as a result of, for example, the additive applied to improve the fluidity of the surface of the powder will come off. There was a situation where it deteriorated.
【0010】本発明は上記問題点を解決するためになさ
れたものである。すなわち、現像スリーブに押圧してい
る薄層形成体の押圧力を強くしなくても現像剤の帯電は
充分に行なわれ、従って現像スリーブの摩耗を減少し、
これによって現像剤の搬送量減少による画像濃度の低下
を防止し、更に薄層形成体の強い押圧力により薄層形成
体と現像スリーブの間の現像剤の無理な通過による現像
剤の性能劣化を防止し、現像スリーブ上の現像剤の均一
な薄層形成が可能となってこれらの効果により高画質の
画像が得られる様にした現像装置を提供することを目的
としたものである。The present invention has been made to solve the above problems. That is, the developer is sufficiently charged without increasing the pressing force of the thin layer forming body pressed against the developing sleeve, thus reducing the abrasion of the developing sleeve,
This prevents a decrease in image density due to a decrease in the amount of developer conveyed, and further, the strong pressing force of the thin layer forming body prevents the performance of the developer due to the forced passage of the developer between the thin layer forming body and the developing sleeve. It is an object of the present invention to provide a developing device which is capable of preventing and forming a uniform thin layer of the developer on the developing sleeve to obtain a high quality image by these effects.
【0011】[0011]
【課題を解決するための手段】上記目的は、像担持体上
に形成された潜像を現像するための、表面上に現像剤を
担持する現像剤担持体と、該現像剤担持体に押圧し、該
現像剤担持体に担持された前記現像剤の量を規制する現
像剤量規制体を配設した現像装置において、前記現像剤
量規制体の、前記現像剤担持体に押圧接触する端面に
は、現像剤を搬送する方向とほぼ平行の方向に平行溝を
設けた事を特徴とする現像装置であって、さらに、前記
現像剤量規制体の端面に設けた平行溝のピッチは、現像
剤の粒径のほぼ0.1倍乃至20倍で、且つ前記溝の深さ
は、現像剤の粒径のほぼ0.1倍乃至20倍である事を特徴
とする現像装置によって達成される。SUMMARY OF THE INVENTION The above-mentioned object is to develop a latent image formed on an image bearing member, a developer bearing member carrying a developer on the surface, and a pressing force applied to the developer bearing member. Then, in a developing device provided with a developer amount regulating body for regulating the amount of the developer carried on the developer carrying body, an end surface of the developer amount regulating body which is in pressure contact with the developer carrying body. The developing device is characterized in that a parallel groove is provided in a direction substantially parallel to the direction in which the developer is conveyed, and further, the pitch of the parallel groove provided on the end face of the developer amount regulating body is The developing device is characterized in that the particle diameter of the developer is approximately 0.1 to 20 times, and the depth of the groove is approximately 0.1 to 20 times the particle diameter of the developer.
【0012】また、上記目的は、前記現像剤量規制体
は、断面が円形の棒材よりなり、その表面には同一径と
なる様に線材を巻き付けた事を特徴とする現像装置であ
って、さらに前記現像剤量規制体の表面に巻き付けた線
材の太さは現像剤の粒径のほぼ0.1倍乃至20倍である事
を特徴とする現像装置によって達成される。Further, the above-mentioned object is a developing device characterized in that the developer amount regulating member is made of a rod having a circular cross section, and a wire is wound on the surface so as to have the same diameter. Further, the thickness of the wire wound around the surface of the developer amount regulating member is approximately 0.1 to 20 times the particle diameter of the developer, which is achieved by the developing device.
【0013】また上記目的は、前記現像剤量規制体は断
面が円形の棒材よりなり、その表面には現像剤の粒径の
ほぼ0.1倍乃至20倍のピッチの螺旋状の溝、又は現像剤
を搬送する方向と平行の方向に現像剤の粒径のほぼ0.1
倍乃至20倍のピッチの平行な溝を設けた事を特徴とする
現像装置によって達成される。Further, the above-mentioned object is that the developer amount regulating member is made of a rod having a circular cross section, and the surface thereof has a spiral groove having a pitch of about 0.1 to 20 times the particle diameter of the developer, or a developing member. The particle size of the developer is approximately 0.1 in the direction parallel to the conveying direction of the developer.
This is achieved by a developing device characterized in that parallel grooves having a pitch of 20 to 20 times are provided.
【0014】そして、前記現像剤量規制体が回転可能な
現像剤量規制体の場合は、前記現像剤担持体によって従
動回転、もしくは動力によって駆動回転する事を特徴と
する現像装置によって達成される。In the case where the developer amount regulating member is a rotatable developer amount regulating member, it is achieved by a developing device characterized in that it is driven to rotate by the developer carrying member or driven and rotated by power. ..
【0015】また上記目的は、前記現像剤量規制体はば
ね性をもった板材よりなり、前記現像剤担持体を押圧可
能であり、前記現像剤担持体を押圧する面には現像剤の
粒径のほぼ0.1倍乃至20倍のピッチの平行な溝を、現像
剤を搬送する方向とほぼ平行の方向に設けた事を特徴と
する現像装置によって達成される。Further, for the above-mentioned purpose, the developer amount regulating body is made of a plate material having a spring property and is capable of pressing the developer carrying body. This is achieved by a developing device characterized in that parallel grooves having a pitch of approximately 0.1 to 20 times the diameter are provided in a direction substantially parallel to the direction in which the developer is conveyed.
【0016】さらに上記目的は、前記現像剤量規制体は
磁性体であり、前記現像剤担持体へ磁力により押圧する
ことを特徴とする現像装置によって達成されるものであ
る。Further, the above object is achieved by a developing device characterized in that the developer amount regulating body is a magnetic body and is pressed against the developer carrying body by a magnetic force.
【0017】[0017]
【実施例】以下、この発明の実施例を添付図面によって
説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【0018】図8は一成分現像剤を用いる現像装置の断
面図である。FIG. 8 is a sectional view of a developing device using a one-component developer.
【0019】現像装置50のハウジング51の内部には、現
像剤担持体である現像スリーブ2とマグネットローラ5
3、現像トナー凝固防止用の振動板54、トナー残量検知
手段55等が配設されている。上記現像スリーブ2は、図
示反時計方向に駆動回転する非磁性円筒体で、その内部
に回動しないように固設したマグネットローラ53を有
し、該現像スリーブ2の長手方向表面の一部はハウジン
グ51の開口部から露出し、像担持体1と平行状態で近接
して配設されている。Inside the housing 51 of the developing device 50, the developing sleeve 2 as a developer carrying member and the magnet roller 5 are provided.
3, a vibrating plate 54 for preventing development toner coagulation, a toner remaining amount detecting means 55, and the like are provided. The developing sleeve 2 is a non-magnetic cylindrical body that is driven and rotated counterclockwise in the drawing, and has a magnet roller 53 fixed therein so as not to rotate. A part of the longitudinal surface of the developing sleeve 2 is It is exposed from the opening of the housing 51 and is arranged in parallel with and close to the image carrier 1.
【0020】また、前記ハウジング51の上部開口を閉蓋
する蓋部材58の上部には、トナー補給容器56が着脱自在
に装着される。A toner replenishing container 56 is removably attached to the upper portion of the lid member 58 that closes the upper opening of the housing 51.
【0021】上記蓋部材58の内側凹部には、現像剤の層
厚を規制する剛性かつ磁性を有する例えばステンレス鋼
棒等の現像剤量規制体(薄層形成体)31と、該薄層形成
体31を保持するホルダー61と、前記薄層形成体31を押圧
する弾性部材4等から成る現像剤量規制手段が設けてあ
る。In the inner concave portion of the lid member 58, a developer amount regulating body (thin layer forming body) 31 such as a stainless steel rod having rigidity and magnetism for regulating the layer thickness of the developer, and the thin layer forming A holder 61 for holding the body 31 and a developer amount regulating means including an elastic member 4 for pressing the thin layer forming body 31 are provided.
【0022】前記現像スリーブ2と像担持体(感光体ド
ラム)1との間隙は、現像スリーブ2の軸端部に同軸に
設けられコロ(図示せず)が、像担持体1周面の両端付
近の画像形成領域外に当接することによって、常に一定
間隙に保持されている。The gap between the developing sleeve 2 and the image bearing member (photosensitive drum) 1 is provided coaxially with the axial end of the developing sleeve 2 and rollers (not shown) are provided at both ends of the peripheral surface of the image bearing member 1. By abutting the outside of the image forming area in the vicinity, it is always held at a constant gap.
【0023】ここで、59は前記像担持体1と現像スリー
ブ2との間隙部に形成される現像領域、65は直流電圧と
交流電圧とを重畳した交流バイアス電源である。Here, 59 is a developing area formed in a gap between the image carrier 1 and the developing sleeve 2, and 65 is an AC bias power source in which a DC voltage and an AC voltage are superposed.
【0024】トナー補給容器56より補給された新規トナ
ーは、ハウジング51内に収容され、振動板54の振動によ
り攪拌され、更に、図示反時計方向に駆動回転する現像
スリーブ2の周面上に層状に付着して搬送され、前記薄
層形成体31の押圧位置を通過して所定の薄層が形成され
る。The new toner replenished from the toner replenishing container 56 is accommodated in the housing 51, is agitated by the vibration of the vibrating plate 54, and is layered on the peripheral surface of the developing sleeve 2 which is driven and rotated counterclockwise in the drawing. The thin layer forming body 31 is conveyed by being adhered to the sheet, and passes through the pressing position of the thin layer forming body 31 to form a predetermined thin layer.
【0025】図9は現像剤量規制手段の縦断面図であ
る。前記蓋部材58の溝部51Aの内壁の一部には、弾性部
材4が複数箇所貼り付けられている。該弾性部材4と前
記溝部51Aで形成される凹部に、前記薄層形成体31が落
し込まれる。そして、該薄層形成体31の両端部のセンタ
ー穴60Aに、ホルダー61の突起部61Aの先端部が遊嵌,挿
入される。FIG. 9 is a vertical sectional view of the developer amount regulating means. A plurality of elastic members 4 are attached to a part of the inner wall of the groove 51A of the lid member 58. The thin layer forming body 31 is dropped into the concave portion formed by the elastic member 4 and the groove portion 51A. Then, the tip ends of the protrusions 61A of the holder 61 are loosely fitted and inserted into the center holes 60A at both ends of the thin layer forming body 31.
【0026】該ホルダー61は蓋部材58の両側面に小ねじ
により固定されている。このようにして、薄層形成体31
はホルダー61から脱落したり外れたりすることがなくな
る。勿論、前記突起部61Aとセンター穴60Aの嵌合状態は
ゆるくし、外れない程度の余裕を持たせてある。The holder 61 is fixed to both sides of the lid member 58 with machine screws. In this way, the thin layer forming body 31
Does not fall off or come off the holder 61. Of course, the fitting state of the projection 61A and the center hole 60A is loose, and there is a margin to prevent it from coming off.
【0027】前記磁性を有する薄層形成体31は、対向す
るマグネットローラ53の磁性と逆の磁性を有し、その吸
引磁力と、前記弾性部材4による弾力との協働によって
現像スリーブ2への押圧力が得られるようにしてある。
そして現像スリーブ2上に運ばれてくる現像剤Dは、前
記磁性薄層形成体31と弾性部材4との押圧力に打ちかっ
て薄層形成体31を持ち上げ、その圧接位置にできた隙間
を通過することによって、均一な現像剤層設定厚さが得
られるようにしてある。そして像担持体1と現像スリー
ブ2との間の現像領域の設定隙間と対応し、最適な現像
が行なえるようにしてある。The magnetic thin layer forming body 31 has a magnetism opposite to the magnetism of the magnet roller 53 which faces the magnetism. The attraction force of the magnetism and the elastic force of the elastic member 4 cooperate to the developing sleeve 2. The pressing force is obtained.
The developer D carried on the developing sleeve 2 lifts the thin layer forming body 31 against the pressing force of the magnetic thin layer forming body 31 and the elastic member 4, and passes through the gap formed at the pressure contact position. By doing so, a uniform developer layer set thickness can be obtained. Then, in correspondence with the set gap in the developing area between the image carrier 1 and the developing sleeve 2, optimum developing can be performed.
【0028】その後、現像が終わって現像スリーブ2上
の余った現像剤Dは、現像装置50のハウジング51内に戻
されて、再び現像スリーブ2上に散布され、連続的に現
像が行われる。After the development, the developer D remaining on the developing sleeve 2 is returned to the inside of the housing 51 of the developing device 50 and scattered again on the developing sleeve 2 to continuously develop it.
【0029】次に図1から図7の図面により本発明の核
心の説明を行なう。Next, the core of the present invention will be described with reference to FIGS. 1 to 7.
【0030】図1は本発明の第一の実施例で、現像剤量
規制体である薄層形成体31はある程度の厚みを持った板
材で出来ており、現像スリーブ2に押圧接触する薄層形
成体31の端面には、図の如く深さdpの台形状の溝がピッ
チPの間隔で多数現像剤の搬送方向とほぼ平行の方向に
設けられ、現像スリーブ2に押圧接触している事を示し
ている。FIG. 1 shows the first embodiment of the present invention. The thin layer forming body 31 which is a developer amount regulating body is made of a plate material having a certain thickness, and is a thin layer which comes into pressure contact with the developing sleeve 2. As shown in the figure, trapezoidal grooves having a depth dp are provided on the end surface of the forming body 31 at intervals of a pitch P in a direction substantially parallel to the conveying direction of the multiplicity of developers, and are in pressure contact with the developing sleeve 2. Is shown.
【0031】この様な形状の薄層形成体31を現像スリー
ブ2に押圧した状態の拡大図が図5である。FIG. 5 is an enlarged view of a state in which the thin layer forming body 31 having such a shape is pressed against the developing sleeve 2.
【0032】図5(a)は、薄層形成体31の現像スリー
ブ2への押圧力が比較的に弱い場合で、薄層形成体31と
現像スリーブ2との間に若干の現像剤が入りこみ、隙間
cが出来て現像スリーブ2を押圧している状態を示して
いる。この様な状態においては、押圧力が小さいため粉
体としての現像剤はそれ程の損傷、すなわち劣化をする
ことはない。また、図示の台形状隙間DC部では現像剤は
薄層形成体31と現像スリーブ2に挟まれた状態で通過す
る。従って現像剤は損傷、すなわち劣化することなく通
過し、通過後は直ちに現像剤は粉体とは言っても流体に
近い流れとなって現像スリーブ2上に拡がり、均一な薄
層となって所定の現像剤層厚となり現像領域へと運ばれ
て潜像を現像することになる。FIG. 5 (a) shows a case where the pressing force of the thin layer forming body 31 against the developing sleeve 2 is relatively weak, and a small amount of developer enters between the thin layer forming body 31 and the developing sleeve 2. , A gap c is formed and the developing sleeve 2 is pressed. In such a state, since the pressing force is small, the developer as powder is not so much damaged, that is, deteriorated. In the trapezoidal gap DC portion shown, the developer passes while being sandwiched between the thin layer forming body 31 and the developing sleeve 2. Therefore, the developer passes without being damaged, that is, deteriorated, and immediately after passing, the developer spreads on the developing sleeve 2 in a flow similar to a fluid, even if it is a powder, and spreads on the developing sleeve 2 to form a uniform thin layer. Then, the latent image is developed by being transferred to the developing area.
【0033】図5(b)は薄層形成体31の現像スリーブ
2への押圧力が強い場合で、薄層形成体31が現像スリー
ブ2に当接して押圧している状態を示している。この様
な状態においては、現像剤は薄層形成体31の台形状の溝
突端と現像スリーブ2との間にはほとんど入らず、現像
剤は図示の台形状隙間DC部のみを図5(a)の場合と同
様に通過し、従って現像剤は固まることなく損傷、すな
わち劣化することもなく通化し、通過後は直ちに現像剤
は現像スリーブ2上に拡がり、均一な薄層となって所定
の現像剤層厚となって現像領域へと運ばれて潜像を現像
することは上で述べた図5(a)の場合と同様である。FIG. 5B shows a case where the pressing force of the thin layer forming body 31 against the developing sleeve 2 is strong, and the thin layer forming body 31 is in contact with and pressing the developing sleeve 2. In such a state, the developer hardly enters between the trapezoidal groove tip of the thin layer forming body 31 and the developing sleeve 2, and only the trapezoidal gap DC portion shown in FIG. ), So that the developer passes through without being solidified and damaged, that is, without being deteriorated. Immediately after passing, the developer spreads on the developing sleeve 2 to form a uniform thin layer. It is the same as in the case of FIG. 5 (a) described above that the latent image is developed by being transferred to the developing area as a developer layer thickness.
【0034】この様にして図5(a)の場合も図5
(b)の場合も、現像剤は薄層形成体31と現像スリーブ
2の間を通過することになるが、この時の薄層形成体31
の現像スリーブ2との押圧接触面には傾斜面も追加され
ているため、その表面積は大巾に増加していることにな
る。この様に表面積が大になるということは、現像剤と
の接触面積が増加するということになるため、この個所
での現像剤は薄層形成体31と現像スリーブ2の間でより
多く摩擦される結果、より多く帯電されることとなる。In this way, the case of FIG.
Also in the case of (b), the developer passes between the thin layer forming body 31 and the developing sleeve 2, but at this time, the thin layer forming body 31.
Since an inclined surface is also added to the pressing contact surface with the developing sleeve 2, the surface area is greatly increased. Such a large surface area means that the contact area with the developer increases, so that the developer at this point is more rubbed between the thin layer forming body 31 and the developing sleeve 2. As a result, it is more charged.
【0035】この様に薄層形成体の現像スリーブへの押
圧接触面に、台形状の切欠き溝を多数現像剤の搬送方向
とほぼ平行の方向に設けることによって、現像スリーブ
上へ現像剤の均一な薄層の形成を容易にし、現像剤の劣
化を防止し、かつ現像剤をより多く帯電させることにな
った。As described above, by providing a trapezoidal cutout groove on the pressing contact surface of the thin layer forming body to the developing sleeve in a direction substantially parallel to the conveying direction of a large number of developers, the developer is transferred onto the developing sleeve. It facilitates formation of a uniform thin layer, prevents deterioration of the developer, and charges the developer more.
【0036】そして、薄層形成体31に設ける台形状の溝
の深さdpとピッチPの値は、現像スリーブ上の現像剤層
の必要層厚を得るために、現像剤の性能や、薄層形成体
の現像スリーブへの押圧力やその他の現像条件によって
変化することになる。The values of the depth dp and the pitch P of the trapezoidal grooves provided in the thin layer forming body 31 are determined by the performance of the developer and the thinness in order to obtain the required layer thickness of the developer layer on the developing sleeve. It will change depending on the pressing force of the layer forming body against the developing sleeve and other developing conditions.
【0037】そして溝の深さdpとピッチPの値は、現像
剤の粒径のほぼ0.1倍乃至20倍の値を、更に好ましくは
1.5倍乃至20倍の値を採用した場合が実験上良い結果が
得られた。The values of the groove depth dp and the pitch P are approximately 0.1 to 20 times the particle diameter of the developer, and more preferably the value.
Good results were obtained experimentally when a value of 1.5 to 20 times was adopted.
【0038】図2は本発明の第二の実施例で、現像剤量
規制体である薄層形成体は丸棒材に線材を密巻きに巻き
付けたものである事を示している図である。FIG. 2 is a second embodiment of the present invention and shows that the thin layer forming body which is the developer amount regulating body is a round bar material in which a wire material is tightly wound. ..
【0039】図示の様に薄層形成体31は丸棒材311に直
系dの線材312を密巻きに、すなわち、ピッチP=dの
様に巻き付けたものである。この様な構造の薄層形成体
31を現像スリーブ2に押圧した状態の拡大図が図6であ
る。As shown in the figure, the thin layer forming body 31 is formed by tightly winding a wire rod 312 of a direct line d on a round bar 311, that is, at a pitch P = d. Thin layer forming body having such a structure
FIG. 6 is an enlarged view of the state where 31 is pressed against the developing sleeve 2.
【0040】図6(a)は、薄層形成体31の現像スリー
ブ2への押圧力が比較的に弱い場合で、薄層形成体31の
線材312と現像スリーブ2との間に若干の現像剤が入り
こみ、隙間cが出来て現像スリーブ2を押圧している状
態を示している。そして本発明においては薄層形成体31
は現像スリーブ2との摩擦力により従動回転するか、ま
たは別の動力によって駆動回転する様に構成されてい
る。この様な状態においては、現像剤は線材312と現像
スリーブ2の間に入り込み隙間cが出来るが押圧力が小
さいため粉体としての現像剤はそれ程の損傷、すなわち
劣化をすることはない。また、図示の三角形状隙間TC部
では線材312が丸棒材311に巻き付けられているため線材
312の面は螺線状をなしており、薄層形成体31も回転す
るため現像剤は線材312と現像スリーブ2の間で薄層形
成体31の回転軸と平行な方向の力も受けるので固まるこ
となく、線材312と現像スリーブ2に挟まれた状態で通
過する。従って現像剤は損傷、すなわち劣化することな
く通過し、通過後は直ちに現像剤は粉体とは言っても流
体に近い流れとなって現像スリーブ2上に拡がり、均一
な薄層となって所定の現像剤層厚となり現像領域へと運
ばれて潜像を現像することになる。FIG. 6A shows a case where the pressing force of the thin layer forming body 31 against the developing sleeve 2 is comparatively weak, and a slight amount of development occurs between the wire 312 of the thin layer forming body 31 and the developing sleeve 2. The state is shown in which the agent has entered and a gap c has been formed to press the developing sleeve 2. And in the present invention, the thin layer forming body 31
Is driven to rotate by a frictional force with the developing sleeve 2 or driven to rotate by another power. In such a state, the developer enters between the wire 312 and the developing sleeve 2 to form a gap c, but the pressing force is small, so that the developer as a powder does not suffer such damage, that is, deterioration. In the triangular gap TC portion shown in the figure, the wire rod 312 is wound around the round bar member 311.
The surface of 312 has a spiral shape, and since the thin layer forming body 31 also rotates, the developer also receives a force between the wire 312 and the developing sleeve 2 in a direction parallel to the rotation axis of the thin layer forming body 31, so that the developer hardens. Without passing, the wire 312 passes between the wire 312 and the developing sleeve 2. Therefore, the developer passes without being damaged, that is, deteriorated, and immediately after passing, the developer spreads on the developing sleeve 2 in a flow similar to a fluid, even if it is a powder, and spreads on the developing sleeve 2 to form a uniform thin layer. Then, the latent image is developed by being transferred to the developing area.
【0041】図6(b)は薄層形成体31の現像スリーブ
2への押圧力が強い場合で、薄層形成体31の線材312が
現像スリーブ2に当接して押圧している状態を示してい
る。この様な状態においては、現像剤は線材312と現像
スリーブ2との間にはほとんど入らず、現像剤は図示の
三角形状隙間TC部のみを図6(a)の場合と同様に通過
し、従って現像剤は固まることなく損傷、すなわち劣化
することもなく通化し、通過後は直ちに現像剤は現像ス
リーブ2上に拡がり、均一な薄層となって所定の現像剤
層厚となって現像領域へと運ばれて潜像を現像すること
は上で述べた図6(a)の場合と同様である。FIG. 6B shows the case where the pressing force of the thin layer forming body 31 against the developing sleeve 2 is strong, and the wire 312 of the thin layer forming body 31 is in contact with and pressing the developing sleeve 2. ing. In such a state, the developer hardly enters between the wire rod 312 and the developing sleeve 2, and the developer passes only the triangular gap TC portion shown in the same manner as in the case of FIG. 6A, Therefore, the developer passes through without hardening, that is, without deterioration, that is, without deterioration, and immediately after passing, the developer spreads on the developing sleeve 2 to form a uniform thin layer having a predetermined developer layer thickness and a developing area. Transferring to and developing the latent image is similar to the case of FIG. 6A described above.
【0042】この様にして図6(a)の場合も図6
(b)の場合も、現像剤は薄層形成体31と現像スリーブ
2の間を通過することになるが、この時の薄層形成体31
の面は線材312が密巻きに巻き付けられているため、そ
の表面積は約1.6倍に増加していることになる。この様
に表面積が大になるということは、現像剤との接触面積
が増加するということになるため、この個所での現像剤
は薄層形成体31と現像スリーブ2の間でより多く摩擦さ
れる結果、より多く帯電されることとなる。In this way, also in the case of FIG.
Also in the case of (b), the developer passes between the thin layer forming body 31 and the developing sleeve 2, but at this time, the thin layer forming body 31.
Since the wire rod 312 is closely wound on the surface of, the surface area is increased by about 1.6 times. Such a large surface area means an increased contact area with the developer, so that the developer at this point is more rubbed between the thin layer forming body 31 and the developing sleeve 2. As a result, it is more charged.
【0043】この様に薄層形成体を丸棒材に線材を巻き
付ける構造とすることによって、現像スリーブ上へ現像
剤の均一な薄層の形成を容易にし、現像剤の劣化を防止
し、かつ現像剤をより多く帯電させることになった。By thus forming the thin layer forming body in a structure in which the wire is wound around the round bar, the uniform thin layer of the developer can be easily formed on the developing sleeve, and the deterioration of the developer can be prevented. It was supposed to charge the developer more.
【0044】そして現像スリーブ2上の現像剤の層厚
は、薄層形成体31の丸棒材311に巻き付ける線材312の太
さdとピッチPによってもコントロールすることが可能
である。The layer thickness of the developer on the developing sleeve 2 can be controlled also by the thickness d and the pitch P of the wire rod 312 wound around the round rod 311 of the thin layer forming body 31.
【0045】図7(a)は太さdの線材312をピッチP
1>dによって丸棒材311に巻き付けた状態を示してい
る。この様な状態においては三角形状隙間TC1が、線材3
12と丸棒材311の間にも出来るため、線材312と現像スリ
ーブ2の間を通過する現像剤量が増加して現像スリーブ
2上の層厚が厚くなることになる。FIG. 7A shows a wire rod 312 having a thickness d and a pitch P.
1> d shows the state of being wound around the round bar 311. In such a state, the triangular clearance TC1 is
Since it can be formed between the wire rod 312 and the round bar 311, the amount of the developer passing between the wire 312 and the developing sleeve 2 is increased, and the layer thickness on the developing sleeve 2 is increased.
【0046】図7(b)は太さd1<dの線材312をピ
ッチP2=d1によって丸棒材311に巻き付けた状態を
示している。この様な状態においては三角形状隙間TC2
は図6の三角形状隙間TCより小さいため、線材312と現
像スリーブ2の間を通過する現像剤量が減少して現像ス
リーブ2上の層厚は薄くなることになる。FIG. 7B shows a state in which the wire rod 312 having the thickness d1 <d is wound around the round bar 311 at the pitch P2 = d1. In such a state, the triangular clearance TC2
Is smaller than the triangular clearance TC in FIG. 6, the amount of developer passing between the wire 312 and the developing sleeve 2 is reduced, and the layer thickness on the developing sleeve 2 is thin.
【0047】この様に現像スリーブ2上の現像剤層の層
厚は、薄層形成体31の丸棒材311に巻き付ける線材312の
太さdとピッチPによってコントロール可能である。そ
してピッチPの値は線材312の太さdによって基本的に
は決まるといった性質のものである。すなわち線材312
の太さdが小さければ必然的にピッチPは小となり、太
さdが大きければピッチPも大となる。そして更にピッ
チPの値は密巻きであるP=dから始まって間隔をあけ
るP>dの状態へ、現像スリーブ上の現像剤層の必要層
厚を得るために、現像剤の性能や、薄層形成体の現像ス
リーブへの押圧力やその他の現像条件によって変化する
ことになる。As described above, the layer thickness of the developer layer on the developing sleeve 2 can be controlled by the thickness d and the pitch P of the wire rod 312 wound around the round rod 311 of the thin layer forming body 31. The value of the pitch P is basically determined by the thickness d of the wire 312. Ie wire rod 312
If the thickness d is small, the pitch P is necessarily small, and if the thickness d is large, the pitch P is also large. Further, the value of the pitch P starts from dense winding P = d and becomes spaced P> d to obtain a necessary layer thickness of the developer layer on the developing sleeve. It will change depending on the pressing force of the layer forming body against the developing sleeve and other developing conditions.
【0048】そして線材312の太さdは、現像剤の粒径
のほぼ0.1倍乃至20倍の値を、更に好ましくは1.5倍乃至
20倍の値を採用した場合が実験上良い結果が得られた。The thickness d of the wire 312 is approximately 0.1 to 20 times the particle diameter of the developer, and more preferably 1.5 to 20 times.
Good results were obtained experimentally when 20 times the value was adopted.
【0049】図3は本発明の第三の実施例で、現像剤量
規制体である薄層形成体は丸棒材にピッチPの螺旋状の
溝を設けたものである。FIG. 3 shows a third embodiment of the present invention in which a thin layer forming body which is a developer amount regulating body is a round bar material provided with spiral grooves having a pitch P.
【0050】この場合の作用、効果については図1で示
したものとほとんど同じなので説明は省略する。また、
螺旋状溝の代りに現像剤の搬送方向と平行の方向の平行
溝でも良い。Since the operation and effect in this case are almost the same as those shown in FIG. 1, description thereof will be omitted. Also,
Instead of the spiral groove, a parallel groove in a direction parallel to the developer conveying direction may be used.
【0051】図4は本発明の第四の実施例で、薄層形成
体が金属ばね板等のばね板材で出来ており、現像スリー
ブへの押圧面に現像剤を搬送する方向とほぼ平行の方向
にピッチPの平行溝を設けたものである。この場合、図
3の丸棒の径が非常に大となって平面に近くなったもの
と考えられる。但し図3の丸棒は回転するが、この場合
は回転せず固定である。但しその作用効果は図1の場合
とほとんど同じなので説明は省略する。FIG. 4 shows a fourth embodiment of the present invention, in which the thin layer forming body is made of a spring plate material such as a metal spring plate, and the pressing surface to the developing sleeve is substantially parallel to the direction in which the developer is conveyed. A parallel groove having a pitch P is provided in the direction. In this case, it is considered that the diameter of the round bar in FIG. 3 became extremely large and became close to a plane. However, although the round bar in FIG. 3 rotates, in this case it does not rotate and is fixed. However, the operation and effect thereof are almost the same as in the case of FIG.
【0052】また、図3,図4の場合のピッチPは図2
の場合の線材312の太さdとピッチPの両方の性質を含
むと考えられ、従ってピッチPが図2の場合の線材312
の太さdと同じ効果を発揮するので、ピッチPは図2の
場合と同様に現像剤の粒径のほぼ0.1倍乃至20倍、更に
好ましくは1.5倍乃至20倍とするのが良い。The pitch P in the case of FIGS. 3 and 4 is as shown in FIG.
It is considered that the properties of both the thickness d and the pitch P of the wire rod 312 in the case of are included, and therefore the wire rod 312 in the case of the pitch P of FIG.
Since the same effect as the thickness d of the developer is exhibited, the pitch P is preferably set to be 0.1 to 20 times, more preferably 1.5 to 20 times the particle diameter of the developer as in the case of FIG.
【0053】[0053]
【発明の効果】本発明により、現像スリーブに押圧して
いる薄層形成体の押圧力を強くしなくても現像剤の帯電
は充分に行なわれ、従って現像スリーブの摩耗を減少
し、これによって現像剤の搬送量減少による画像濃度の
低下を防止し、更に薄層形成体の強い押圧力により、薄
層形成体と現像スリーブの間の現像剤の無理な通過によ
る現像剤の性能劣化を防止し、現像スリーブ上の現像剤
の均一な薄層形成が可能となって、これらの効果により
高画質の画像が得られる様にした現像装置が提供される
こととなった。According to the present invention, the developer is sufficiently charged without increasing the pressing force of the thin layer forming body which is pressed against the developing sleeve, and therefore, the wear of the developing sleeve is reduced, thereby reducing the wear of the developing sleeve. Prevents the decrease in image density due to the reduction in the amount of developer conveyed, and the strong pressing force of the thin layer former prevents the deterioration of the performance of the developer due to the forced passage of the developer between the thin layer former and the developing sleeve. However, it is possible to form a uniform thin layer of the developer on the developing sleeve, and it is possible to provide a developing device capable of obtaining a high-quality image by these effects.
【図1】本発明に基づく第一の実施例の現像剤量規制体
(薄層形成体)付近の拡大図。FIG. 1 is an enlarged view of the vicinity of a developer amount regulating body (thin layer forming body) according to a first embodiment of the present invention.
【図2】本発明に基づく第二の実施例の現像剤量規制体
(薄層形成体)付近の拡大図。FIG. 2 is an enlarged view of the vicinity of a developer amount regulating body (thin layer forming body) according to a second embodiment of the present invention.
【図3】本発明に基づく第三の実施例の現像剤量規制体
(薄層形成体)付近の拡大図。FIG. 3 is an enlarged view of the vicinity of a developer amount regulating body (thin layer forming body) according to a third embodiment of the present invention.
【図4】本発明に基づく第四の実施例の現像剤量規制体
(薄層形成体)付近の拡大図。FIG. 4 is an enlarged view of the vicinity of a developer amount regulating body (thin layer forming body) according to a fourth embodiment of the present invention.
【図5】(a),(b)は第一の実施例の現像剤量規制
体(薄層形成体)の部分拡大図。5A and 5B are partially enlarged views of a developer amount regulating body (thin layer forming body) of the first embodiment.
【図6】(a),(b)は第二の実施例の現像剤量規制
体(薄層形成体)の部分拡大図。6A and 6B are partially enlarged views of a developer amount regulating body (thin layer forming body) of the second embodiment.
【図7】(a),(b)は第二の実施例の現像剤量規制
体(薄層形成体)の別の部分拡大図。7A and 7B are another partially enlarged views of the developer amount regulating body (thin layer forming body) of the second embodiment.
【図8】本発明に基づく現像装置の全体構成図。FIG. 8 is an overall configuration diagram of a developing device based on the present invention.
【図9】本発明に基づく現像装置の現像剤量規制体(薄
層形成体)付近の縦断面図。FIG. 9 is a longitudinal sectional view of the vicinity of a developer amount regulating body (thin layer forming body) of a developing device according to the present invention.
【図10】従来の現像装置主要部の図で、(a)は現像
スリーブへ磁力により現像剤量規制体(薄層形成体)を
押圧している状況を示している図。(b)は(a)に更
に弾性部材の押圧力が加わっている状況を示している
図。(c)は現像剤量規制体(薄層形成体)が板状の弾
性材の場合の図。FIG. 10 is a diagram of a main part of a conventional developing device, and FIG. 10A is a diagram showing a state in which a developer amount regulating body (thin layer forming body) is pressed against a developing sleeve by a magnetic force. FIG. 9B is a diagram showing a situation in which the pressing force of the elastic member is further applied to FIG. FIG. 6C is a diagram when the developer amount regulating body (thin layer forming body) is a plate-shaped elastic material.
1 像担持体 2 現像剤担持体(現像スリーブ) 31 現像剤量規制体(薄層形成体) 311 丸棒材 312 線材 4 弾性部材 50 現像装置 c 隙間 dp 溝の深さ d,d1 線材の太さ P,P1,P2 線材又は溝のピッチ DC 台形状隙間 TC,TC1,TC2 三角形状隙間 1 image carrier 2 developer carrier (developing sleeve) 31 developer amount regulator (thin layer forming body) 311 round bar material 312 wire rod 4 elastic member 50 developing device c gap dp groove depth d, d1 thick wire rod P, P1, P2 Pitch of wire rod or groove DC Trapezoidal clearance TC, TC1, TC2 Triangular clearance
Claims (8)
ための、表面上に現像剤を担持する現像剤担持体と、該
現像剤担持体に押圧し、該現像剤担持体に担持された前
記現像剤の量を規制する現像剤量規制体を配設した現像
装置において、前記現像剤量規制体の、前記現像剤担持
体に押圧接触する端面には、現像剤を搬送する方向とほ
ぼ平行の方向に平行溝を設けた事を特徴とする現像装
置。1. A developer carrying body for carrying a developer on a surface for developing a latent image formed on an image carrying body, and pressing the developer carrying body to the developer carrying body. In a developing device provided with a developer amount regulating body for regulating the amount of the carried developer, the developer is conveyed to an end surface of the developer amount regulating body which is in pressure contact with the developer carrying body. A developing device having parallel grooves provided in a direction substantially parallel to the direction.
溝のピッチは、現像剤の粒径のほぼ0.1倍乃至20倍で、
且つ前記溝の深さは、現像剤の粒径のほぼ0.1倍乃至20
倍である事を特徴とする請求項1記載の現像装置。2. The pitch of the parallel grooves provided on the end surface of the developer amount regulating member is approximately 0.1 to 20 times the particle diameter of the developer,
The depth of the groove is approximately 0.1 to 20 times the particle size of the developer.
2. The developing device according to claim 1, wherein the developing device is doubled.
材よりなり、その表面には同一径となる様に線材を巻き
付けた事を特徴とする請求項1記載の現像装置。3. The developing device according to claim 1, wherein the developer amount regulator is made of a rod having a circular cross section, and a wire is wound around the surface of the rod so as to have the same diameter.
線材の太さは現像剤の粒径のほぼ0.1倍乃至20倍である
事を特徴とする請求項3記載の現像装置。4. The developing device according to claim 3, wherein the thickness of the wire wound around the surface of the developer amount regulator is approximately 0.1 to 20 times the particle diameter of the developer.
よりなり、その表面には現像剤の粒径のほぼ0.1倍乃至2
0倍のピッチの螺旋状の溝、又は現像剤を搬送する方向
と平行の方向に現像剤の粒径のほぼ0.1倍乃至20倍のピ
ッチの平行な溝を設けた事を特徴とする請求項1記載の
現像装置。5. The developer amount control body is made of a rod having a circular cross section, and the surface thereof has a particle size of approximately 0.1 to 2 times the particle size of the developer.
A spiral groove having a pitch of 0 times, or a parallel groove having a pitch of approximately 0.1 to 20 times the particle diameter of the developer is provided in a direction parallel to the direction in which the developer is conveyed. 1. The developing device according to 1.
によって従動回転、もしくは動力によって駆動回転する
事を特徴とする請求項3乃至5のいずれか1項に記載の
現像装置。6. The developing device according to claim 3, wherein the developer amount regulator is driven to rotate by the developer carrier or driven to rotate by power.
材よりなり、前記現像剤担持体を押圧可能であり、前記
現像剤担持体を押圧する面には現像剤の粒径のほぼ0.1
倍乃至20倍のピッチの平行な溝を、現像剤を搬送する方
向とほぼ平行の方向に設けた事を特徴とする請求項1に
記載の現像装置。7. The developer amount regulating body is made of a plate material having a spring property and is capable of pressing the developer carrying body, and the surface of the developer carrying body that is pressed has substantially the same particle size as the developer. 0.1
The developing device according to claim 1, wherein parallel grooves having a pitch of double to 20 times are provided in a direction substantially parallel to a direction in which the developer is conveyed.
記現像剤担持体へ磁力により押圧することを特徴とする
請求項1乃至7のいずれか1項に記載の現像装置。8. The developing device according to claim 1, wherein the developer amount regulating body is a magnetic body and is pressed against the developer carrying body by a magnetic force.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3196698A JPH0540399A (en) | 1991-08-06 | 1991-08-06 | Developing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3196698A JPH0540399A (en) | 1991-08-06 | 1991-08-06 | Developing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0540399A true JPH0540399A (en) | 1993-02-19 |
Family
ID=16362104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3196698A Pending JPH0540399A (en) | 1991-08-06 | 1991-08-06 | Developing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0540399A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9002242B2 (en) | 2012-03-15 | 2015-04-07 | Canon Kabushiki Kaisha | Developing apparatus |
US9235158B2 (en) | 2014-03-05 | 2016-01-12 | Canon Kabushiki Kaisha | Developing device |
-
1991
- 1991-08-06 JP JP3196698A patent/JPH0540399A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9002242B2 (en) | 2012-03-15 | 2015-04-07 | Canon Kabushiki Kaisha | Developing apparatus |
US9235158B2 (en) | 2014-03-05 | 2016-01-12 | Canon Kabushiki Kaisha | Developing device |
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