JP2006113350A - Developing apparatus and method for abutting blade thereof - Google Patents

Developing apparatus and method for abutting blade thereof Download PDF

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JP2006113350A
JP2006113350A JP2004301361A JP2004301361A JP2006113350A JP 2006113350 A JP2006113350 A JP 2006113350A JP 2004301361 A JP2004301361 A JP 2004301361A JP 2004301361 A JP2004301361 A JP 2004301361A JP 2006113350 A JP2006113350 A JP 2006113350A
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blade
contact
developer
developing
developing device
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JP4615959B2 (en
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Riichi Sakuma
理一 佐久間
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Seiko Instruments Inc
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Seiko Instruments Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a developing apparatus capable of attaining an image of good image quality free from a sleeve ghost and density reduction. <P>SOLUTION: The developing apparatus includes a cylindrical developing sleeve 2 that rotates while carrying toner 4 on the surface, and the developing blade 6 arranged in contact with the surface of the developing sleeve 2 so as to regulate the film thickness of the toner on the surface. And the contact surface pressure of the developing blade 6 with the developing sleeve 2 is limited to be ≥100 g/cm<SP>2</SP>and ≤200 g/cm<SP>2</SP>. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、電子写真記録装置に用いられる現像装置に関し、特に画像記録形成用の表示装置、プリンタ、ファクシミリ電子写真装置などの種々の装置に適用可能な現像装置に関する。   The present invention relates to a developing device used in an electrophotographic recording apparatus, and more particularly to a developing apparatus applicable to various apparatuses such as a display device for image recording formation, a printer, and a facsimile electrophotographic apparatus.

従来、回転可能な非磁性体からなる円筒状の現像剤担持体（以下、現像スリーブと称する）の内部に固定された磁界発生手段を配し、現像スリーブ上に前記磁界発生手段による磁気力によって保持されながら現像部に向けて搬送される現像剤（以下、トナーと称する）を、現像ブレードによる接触圧によって所定の膜厚に規制した後、上記の現像部で円筒状の静電潜像担持体（以下、感光体ドラムと称する）に移行させて感光体ドラム上の静電潜像を現像する現像装置が知られている。   Conventionally, a magnetic field generating means fixed inside a cylindrical developer carrier (hereinafter referred to as a developing sleeve) made of a rotatable non-magnetic material has been disposed, and a magnetic force generated by the magnetic field generating means is provided on the developing sleeve. The developer (hereinafter referred to as toner) conveyed to the developing unit while being held is regulated to a predetermined film thickness by the contact pressure by the developing blade, and then the cylindrical electrostatic latent image is carried by the developing unit. 2. Description of the Related Art A developing device is known that develops an electrostatic latent image on a photosensitive drum by shifting to a photosensitive body (hereinafter referred to as a photosensitive drum).

このような現像装置において、現像ブレードの現像スリーブに対する良好な圧接条件は、接触線圧で規定されており、所望の接触線圧が得られるよう現像ブレード保持部の設計的な条件設定がなされていた。たとえば、特許文献１に現像スリーブの外径と現像ブレードの単位接触長あたりの接触線圧の良好な条件が提案されている。
特公平４−６６５１５号公報 In such a developing apparatus, the favorable pressure contact condition of the developing blade against the developing sleeve is defined by the contact line pressure, and the design condition of the developing blade holder is set so as to obtain a desired contact line pressure. It was. For example, Patent Document 1 proposes a favorable condition of the contact sleeve pressure per unit contact length of the developing sleeve and the developing blade.
Japanese Examined Patent Publication No. 4-66515

しかしながら、所望の接触線圧が得られるよう現像ブレード保持部の設計条件を決定して製造された現像装置において画質が安定しないという問題があった。この原因について鋭意検討したところ、現像ブレードの現像スリーブに対する接触面圧は現像スリーブ円周方向の接触幅に左右されるため、同一の接触線圧条件下でも面圧が異なり、トナーの現像スリーブに対する膜厚や帯電量を安定させるのが困難であることが判った。このため、前述したように画質が安定せず、特にスリーブゴーストと呼ばれる印字不具合（図９参照）や、濃度が安定しないという問題があった。   However, there is a problem that the image quality is not stable in the developing device manufactured by determining the design condition of the developing blade holding unit so that a desired contact linear pressure can be obtained. As a result of intensive studies on the cause of this, the contact surface pressure of the developing blade with respect to the developing sleeve depends on the contact width in the circumferential direction of the developing sleeve. It was found that it is difficult to stabilize the film thickness and charge amount. For this reason, as described above, the image quality is not stable, and in particular, there is a printing defect called sleeve ghost (see FIG. 9) and the density is not stable.

そこで本発明は、上記の問題点を解消し、画質の良好な現像装置を提供することを目的とする。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above problems and to provide a developing device with good image quality.

上記目的を達成するために本発明は、表面に現像剤を担持して回転する円筒状の現像剤担持体と、該現像剤担持体の表面に接触するよう配置され、前記現像剤の前記表面に対する膜厚を規制するブレードとを有する現像装置において、前記ブレードの前記現像剤担持体に対する接触面圧が１００ｇ／ｃｍ2以上２００ｇ／ｃｍ2以下であることを特徴とする。 In order to achieve the above object, the present invention provides a cylindrical developer carrying member that rotates while carrying a developer on the surface, and is arranged so as to contact the surface of the developer carrying member, and the surface of the developer. A developing device having a blade for regulating the film thickness of the blade, wherein a contact surface pressure of the blade with respect to the developer carrying member is 100 g / cm 2 or more and 200 g / cm 2 or less.

そして、前記ブレードの前記現像剤担持体との接触位置における単位接触長さ当たりの接触線圧が７０ｇ／ｃｍであるとき、前記ブレードの、前記現像剤担持体の回転方向における接触幅が３ｍｍ以上８ｍｍ以下であることが好ましい。   When the contact linear pressure per unit contact length at the contact position of the blade with the developer carrier is 70 g / cm, the contact width of the blade in the rotation direction of the developer carrier is 3 mm or more. It is preferable that it is 8 mm or less.

上記のようにブレードの現像剤担持体に対する接触面圧を１００ｇ／ｃｍ2以上２００ｇ／ｃｍ2以下に限定することにより、トナーの現像スリーブ表面に対する膜厚や帯電量を安定させることが可能である。このため、画質が安定し、特にスリーブゴーストや濃度低下の無い良好な画質が得られる。 By limiting the contact surface pressure of the blade to the developer carrying member to 100 g / cm 2 or more and 200 g / cm 2 or less as described above, it is possible to stabilize the film thickness and charge amount of the toner on the surface of the developing sleeve. . For this reason, the image quality is stable, and particularly good image quality without sleeve ghost and density reduction can be obtained.

本発明によれば、スリーブゴーストや濃度低下の無い良好な画質を得られる現像装置を提供することができる。   According to the present invention, it is possible to provide a developing device that can obtain a good image quality without sleeve ghosting or density reduction.

以下、本発明の実施の形態について図面を参照して説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は本発明の一つの実施形態による現像装置の概要構成を示す断面図である。本実施形態による現像装置は、カールソン電子写真法を用いた現像装置を例にとって説明することとし、その全体構成は既に周知であるので、本発明に係る静電潜像担持体である感光体ドラムと、該感光体ドラムの外周部近傍に設けられている現像器等について詳細に図示し、カールソンプロセスにおける一次帯電手段、露光手段、クリーニング手段等の図示は省略した。   FIG. 1 is a sectional view showing a schematic configuration of a developing device according to one embodiment of the present invention. The developing device according to the present embodiment will be described by taking a developing device using the Carlson electrophotographic method as an example, and since the entire configuration is already well known, the photosensitive drum which is the electrostatic latent image carrier according to the present invention. In addition, the developing unit and the like provided in the vicinity of the outer peripheral portion of the photosensitive drum are illustrated in detail, and illustration of a primary charging unit, an exposure unit, a cleaning unit, and the like in the Carlson process is omitted.

図１において、感光体ドラム１は矢印Ａ方向に回転自在に軸支されており、その感光体ドラム１の外縁部近傍には現像器が配設されている。感光体ドラム１上には、既に公知となっている帯電手段および画像露光手段等によって静電潜像が形成されるようになっている。   In FIG. 1, a photosensitive drum 1 is rotatably supported in the direction of arrow A, and a developing device is disposed in the vicinity of the outer edge of the photosensitive drum 1. An electrostatic latent image is formed on the photosensitive drum 1 by a known charging means and image exposure means.

現像器は、一部に開口が設けられ内部にトナーを収容するトナー容器４を有する。トナー容器４の開口４ａには回転自在な現像スリーブ２の外周面の一部が臨んでいて、トナー容器４内のトナー５と接触可能になっている。現像スリーブ２のトナー容器４とは反対側に感光体ドラム１が配置され、感光体ドラム１の外周面が現像スリーブ２の外周面と近接している。   The developing device includes a toner container 4 which is provided with an opening in a part thereof and stores toner therein. A part of the outer peripheral surface of the rotatable developing sleeve 2 faces the opening 4 a of the toner container 4, so that the toner 5 in the toner container 4 can be contacted. The photosensitive drum 1 is disposed on the opposite side of the developing sleeve 2 from the toner container 4, and the outer peripheral surface of the photosensitive drum 1 is close to the outer peripheral surface of the developing sleeve 2.

現像スリーブ２の外周面の、トナー容器４の開口４ａに臨んだ面の近傍には、現像ブレード６の先端が当接している。現像ブレード６はウレタン系またはシリコン系などのゴムをＳＵＳ製の板ばねの先端に接着固定したものであり、先端のゴム材を現像スリーブ２の外周面に接触させている。この現像ブレード先端のゴム材を支持する板ばねは現像スリーブの回転方向下流側に離間するように傾けて配置される。   The tip of the developing blade 6 is in contact with the vicinity of the outer peripheral surface of the developing sleeve 2 facing the opening 4a of the toner container 4. The developing blade 6 is made by adhering and fixing a rubber such as urethane or silicon to the tip of a SUS leaf spring, and a rubber material at the tip is brought into contact with the outer peripheral surface of the developing sleeve 2. The leaf spring that supports the rubber material at the tip of the developing blade is disposed so as to be spaced apart downstream in the rotation direction of the developing sleeve.

現像スリーブ２の中には６つの磁極をもつ磁界発生手段としてのマグネットロール３が配置固定されている。マグネットロール３の６つの磁極のうち１極は感光体ドラム１に対向する位置に配置されており、対向する磁極はＮ極である。また、現像ブレード６の現像スリーブ２に対する接触位置は隣り合うＮ極とＳ極の極間に設定されている。   In the developing sleeve 2, a magnet roll 3 as a magnetic field generating means having six magnetic poles is disposed and fixed. Of the six magnetic poles of the magnet roll 3, one pole is disposed at a position facing the photosensitive drum 1, and the opposite magnetic pole is an N pole. The contact position of the developing blade 6 with respect to the developing sleeve 2 is set between the adjacent N pole and S pole.

このような現像スリーブ２は矢印Ｂ方向（反時計周り）に回転し、マグネットロール３の磁極によって現像スリーブ２の表面にトナー５が付着し、現像スリーブ２の感光体ドラム１の外周面と対向している現像部位に搬出されるようになっている。そして、現像部位にトナーが搬出される途中で、現像スリーブ２上に付着したトナー膜厚が現像ブレード６によって調整される。   Such a developing sleeve 2 rotates in the direction of arrow B (counterclockwise), and the toner 5 adheres to the surface of the developing sleeve 2 by the magnetic pole of the magnet roll 3 and faces the outer peripheral surface of the photosensitive drum 1 of the developing sleeve 2. It is carried out to the developing site. Then, the toner film thickness adhering to the developing sleeve 2 is adjusted by the developing blade 6 while the toner is being carried out to the developing site.

このとき、現像ブレードの現像スリーブに対する接触面圧を、以下に説明する実験結果から一定の範囲に限定した。これにより良好な画質が得られることが判明した。以下、実験結果について示す。   At this time, the contact surface pressure of the developing blade with respect to the developing sleeve was limited to a certain range from the experimental results described below. This proved that good image quality can be obtained. The experimental results are shown below.

実験方法として、現像ブレード６の現像スリーブ２の円周方向の接触幅（以下、ニップ幅と称し、図２に示すａの幅である。）を可変させ、各ニップ幅と画質の関係を実験的に求めた。   As an experimental method, the contact width in the circumferential direction of the developing sleeve 2 of the developing blade 6 (hereinafter referred to as the nip width, which is the width a shown in FIG. 2) is varied, and the relationship between each nip width and image quality is tested. Asked for.

現像スリーブ２の外径を４０ｍｍ、現像ブレード６のゴム硬度を４０度〜７０度の範囲とし、現像ブレード６の現像スリーブ２との接触位置における単位長さ当たりの接触圧（以下、接触線圧という）を７０ｇ／ｃｍとする条件下で実験を行ない、それぞれのニップ幅に対する、現像スリーブ上のトナー帯電量を測定した。図３にこの測定結果を示すとともに、図４に図３の各接触面圧に対する帯電量の関係をグラフ化した。   The outer diameter of the developing sleeve 2 is 40 mm, the rubber hardness of the developing blade 6 is in the range of 40 to 70 degrees, and the contact pressure per unit length at the contact position of the developing blade 6 with the developing sleeve 2 (hereinafter referred to as contact linear pressure). And the toner charge amount on the developing sleeve with respect to each nip width was measured. FIG. 3 shows the measurement results, and FIG. 4 is a graph showing the relationship between the charge amount and the contact surface pressure in FIG.

上述した実験によれば、ニップ幅が３ｍｍよりも狭い場合は接触面圧が２３０ｇ／ｃｍ2以上と高くなるためトナーが破壊され、また接触時間が短いため逆帯電トナーが増加し、スリーブゴーストと呼ばれる印字不具合が発生する。さらに、トナーの現像スリーブに対する膜厚が薄くなり濃度低下が発生することが確認された。 According to the above-described experiment, when the nip width is smaller than 3 mm, the contact surface pressure becomes as high as 230 g / cm 2 or more, so the toner is destroyed, and because the contact time is short, the reversely charged toner increases, A printing defect called occurs. Further, it has been confirmed that the film thickness of the toner with respect to the developing sleeve is reduced and the density is lowered.

また、ニップ幅が８ｍｍよりも広い場合には、接触面圧が９０ｇ／ｃｍ2以下と低く、トナー帯電量が−３μＣoul/gより絶対値で少なくなって十分なトナー帯電量が得られないため、濃度低下の不具合が発生することが確認された。 Further, when the nip width is wider than 8 mm, the contact surface pressure is as low as 90 g / cm 2 or less, and the toner charge amount becomes smaller than −3 μCoul / g in absolute value, so that a sufficient toner charge amount cannot be obtained. It was confirmed that the problem of density reduction occurred.

以上の実験結果から、接触面圧を１００〜２００ｇ／ｃｍ2の範囲に限定することにより、スリーブゴーストや濃度低下の無い良好な画質が得られることが判明した。 From the above experimental results, it has been found that by limiting the contact surface pressure to a range of 100 to 200 g / cm 2, a good image quality without sleeve ghost and density reduction can be obtained.

また、接触線圧が６０ｇ／ｃｍおよび８０ｇ／ｃｍのときについても上記と同様の実験、すなわち現像スリーブ２の外径を４０ｍｍとし、現像ブレード６のゴム硬度を４０度〜７０度の範囲とする条件の下で、各ニップ幅に対する現像スリーブ上のトナー帯電量を測定した。図５及び図６は接触線圧が６０ｇ／ｃｍの場合の、各ニップ幅に対するトナーの帯電量の相関を示し、図７及び図８は接触線圧が８０ｇ／ｃｍの場合の、各ニップ幅に対するトナーの帯電量の相関を示している。   Further, when the contact linear pressure is 60 g / cm and 80 g / cm, the same experiment as described above, that is, the outer diameter of the developing sleeve 2 is 40 mm, and the rubber hardness of the developing blade 6 is in the range of 40 degrees to 70 degrees. Under the conditions, the toner charge amount on the developing sleeve for each nip width was measured. 5 and 6 show the correlation of the toner charge amount with each nip width when the contact linear pressure is 60 g / cm, and FIGS. 7 and 8 show the nip widths when the contact linear pressure is 80 g / cm. 3 shows the correlation of the charge amount of the toner with respect to.

これらの図によれば、接触線圧が６０ｇ／ｃｍおよび８０ｇ／ｃｍの場合も接触面圧が１００〜２００ｇ／ｃｍ2の範囲においてトナー帯電量が−３μＣoul/gより絶対値で多くあり十分なトナー帯電量が得られており、少なくともこの範囲ではスリーブゴーストや濃度低下の無い画質が確認できた。 According to these figures, even when the contact linear pressure is 60 g / cm and 80 g / cm, the toner charge amount is larger in absolute value than −3 μCoul / g in the range of the contact surface pressure of 100 to 200 g / cm 2 , which is sufficient. The toner charge amount was obtained, and at least in this range, an image quality without sleeve ghost or density reduction could be confirmed.

本発明の一つの実施形態による現像装置の概要構成を示す断面図である。1 is a cross-sectional view illustrating a schematic configuration of a developing device according to an embodiment of the present invention. 図１の現像ブレードの現像スリーブに対するニップ幅を示す概略図である。FIG. 2 is a schematic diagram illustrating a nip width of the developing blade of FIG. 1 with respect to a developing sleeve. 現像ブレードの現像スリーブに対する接触線圧が７０ｇ／ｃｍの場合の、各ニップ幅に対するトナー帯電量を示す図である。FIG. 7 is a diagram illustrating a toner charge amount with respect to each nip width when the contact linear pressure of the developing blade to the developing sleeve is 70 g / cm. 図３の各トナー帯電量と接触面圧との関係を示すグラフである。4 is a graph showing the relationship between each toner charge amount and contact surface pressure in FIG. 3. 現像ブレードの現像スリーブに対する接触線圧が６０ｇ／ｃｍの場合の、各ニップ幅に対するトナー帯電量を示す図である。FIG. 7 is a diagram illustrating a toner charge amount with respect to each nip width when the contact linear pressure of the developing blade to the developing sleeve is 60 g / cm. 図５の各トナー帯電量と接触面圧との関係を示すグラフである。6 is a graph showing a relationship between each toner charge amount and contact surface pressure in FIG. 5. 現像ブレードの現像スリーブに対する接触線圧が８０ｇ／ｃｍの場合の、各ニップ幅に対するトナー帯電量を示す図である。FIG. 7 is a diagram illustrating a toner charge amount with respect to each nip width when the contact linear pressure of the developing blade to the developing sleeve is 80 g / cm. 図７の各トナー帯電量と接触面圧との関係を示すグラフである。8 is a graph showing a relationship between each toner charge amount and contact surface pressure in FIG. 7. スリーブゴーストを示す図である。It is a figure which shows a sleeve ghost.

符号の説明Explanation of symbols

１ 感光体ドラム
２ 現像スリーブ
３ マグネットロール
４ トナー容器
５ トナー
６ 現像ブレード DESCRIPTION OF SYMBOLS 1 Photosensitive drum 2 Developing sleeve 3 Magnet roll 4 Toner container 5 Toner 6 Developing blade

Claims (7)

表面に現像剤を担持して回転する円筒状の現像剤担持体と、該現像剤担持体の表面に接触するよう配置され、前記現像剤の前記表面に対する膜厚を規制するブレードとを有する現像装置において、
前記ブレードの前記現像剤担持体に対する接触面圧が１００ｇ／ｃｍ2以上２００ｇ／ｃｍ2以下であることを特徴とする現像装置。 Development having a cylindrical developer carrying member that rotates with a developer carried on the surface, and a blade that is disposed in contact with the surface of the developer carrying member and regulates the film thickness of the developer with respect to the surface In the device
Developing apparatus is characterized in that the contact surface pressure with respect to the developer carrying member of the blade is 100 g / cm 2 or more 200 g / cm 2 or less. 前記ブレードの前記現像剤担持体との接触位置における単位接触長さ当たりの接触線圧が７０ｇ／ｃｍであるとき、前記ブレードの、前記現像剤担持体の回転方向における接触幅が３ｍｍ以上８ｍｍ以下であることを特徴とする請求項１に記載の現像装置。   When the contact linear pressure per unit contact length at the contact position of the blade with the developer carrier is 70 g / cm, the contact width of the blade in the rotation direction of the developer carrier is 3 mm or more and 8 mm or less. The developing device according to claim 1, wherein: 前記円筒状の現像剤担持体の外径が４０ｍｍ以上であることを特徴とする請求項１または２に記載の現像装置。   The developing device according to claim 1, wherein an outer diameter of the cylindrical developer carrying member is 40 mm or more. 前記ブレードは前記現像剤担持体の回転方向下流側に延びるように配置されていることを特徴とする請求項１または２に記載の現像装置。   The developing device according to claim 1, wherein the blade is disposed so as to extend downstream in the rotation direction of the developer carrying member. 前記現像剤担持体は静電潜像担持体に近接配置されており、
前記現像剤担持体の中には、該現像剤担持体の内周に沿って６つの磁極をもつ磁界発生手段が固定され、該磁界発生手段の６つの磁極のうち１極は前記静電潜像担持体に対向する位置に配置されており、該静電潜像担持体に対向する磁極はＮ極であることを特徴とする請求項１から４のいずれかに記載の現像装置。 The developer carrier is disposed in proximity to the electrostatic latent image carrier,
In the developer carrier, a magnetic field generating means having six magnetic poles is fixed along the inner periphery of the developer carrier, and one of the six magnetic poles of the magnetic field generating means is the electrostatic latent 5. The developing device according to claim 1, wherein the developing device is disposed at a position facing the image carrier, and a magnetic pole facing the electrostatic latent image carrier is an N pole. 前記ブレードの前記現像剤担持体に対する接触位置は、前記磁界発生手段の隣り合う磁極の間にあることを特徴とする請求項５に記載の現像装置。   The developing device according to claim 5, wherein a contact position of the blade with the developer carrying member is between adjacent magnetic poles of the magnetic field generating unit. 表面に現像剤を担持して回転する円筒状の現像剤担持体と、前記現像剤の前記現像剤担持体の表面に対する膜厚を規制するブレードを有する現像装置における、前記現像剤担持体の表面に前記ブレードを当接させるときのブレード当接方法において、
前記ブレードの前記現像剤担持体に対する接触面圧が１００ｇ／ｃｍ2以上２００ｇ／ｃｍ2以下の範囲になるように前記現像剤担持体の表面に前記ブレードを当接させることを特徴とする現像装置のブレード当接方法。 The surface of the developer carrier in a developing device having a cylindrical developer carrier that rotates with a developer carried on the surface and a blade that regulates the film thickness of the developer relative to the surface of the developer carrier In the blade contact method when contacting the blade to
A developing device, wherein the blade is brought into contact with the surface of the developer carrying member so that a contact surface pressure of the blade with respect to the developer carrying member is in a range of 100 g / cm 2 or more and 200 g / cm 2 or less. Blade contact method.
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JPH04318574A (en) * 1991-04-17 1992-11-10 Canon Inc Developing device
JPH05289522A (en) * 1992-04-08 1993-11-05 Canon Inc Image forming device
JPH11109755A (en) * 1997-09-30 1999-04-23 Mita Ind Co Ltd Developing device for image forming device

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JPS5670559A (en) * 1979-11-14 1981-06-12 Canon Inc Developing method
JPH02130570A (en) * 1988-11-11 1990-05-18 Mita Ind Co Ltd Developing device
JPH03157679A (en) * 1989-10-31 1991-07-05 Xerox Corp Device for detecting amount of toner used
JPH0470684A (en) * 1990-07-06 1992-03-05 Toshiba Corp Developing device
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