JP4615959B2 - Developing device and blade contact method in the device - Google Patents
Developing device and blade contact method in the device Download PDFInfo
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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。
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、磁性現像剤を格納する現像剤容器と、内部にマグネットロールを有し該マグネットロールの磁力によって表面に前記磁性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、前記磁性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し、前記現像剤担持体の表面に担持された前記磁性現像剤を前記ブレードにより帯電させる現像装置において、前記ブレードはゴム硬度が40度〜70度のウレタンゴムまたはシリコンゴムのゴム材を板ばねの先端に接着固定したものであり、前記現像剤容器は開口部を有し、前記開口部に前記現像剤担持体の外周面の一部が臨み前記磁性現像剤と前記外周面が接触するように配置され、前記開口部において前記表面に前記マグネットロールの磁力により前記磁性現像剤を付着させ、前記現像剤担持体の回転方向下流であって前記開口部の近傍に前記ブレードの先端が当接するように配置し、さらに前記板ばねを前記現像剤担持体の回転方向下流側に離間するように傾けて配置して前記ゴム材を前記表面に接触させ、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60g/cmから80g/cmの範囲であり、かつ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4mmから6mmであり、かつ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/平方センチメートル以上200g/平方センチメートル以下の範囲内である条件で前記ブレードを前記マグネットロールの磁力により前記磁性現像剤が付着した前記現像剤担持体に接触させ、前記ブレード通過後の前記現像剤担持体の前記表面のトナー帯電量が−3μCoul/gから−3.6μCoul/gの範囲内であることを特徴とする。 In order to achieve the above object, the present invention provides a developer container for storing a magnetic developer and a cylindrical roll that has a magnet roll inside and rotates while carrying the magnetic developer on the surface by the magnetic force of the magnet roll . a developer carrying member, disposed to contact the surface of the developer carrying member, have a blade for regulating the thickness for the surface of the magnetic developer, carried on the surface of the developer carrying member wherein the magnetic developer developing device for charging by said blade, said blade are those rubber hardness is adhered and fixed a rubber material of 40 to 70 degrees urethane rubber or silicone rubber on the tip of the leaf spring, the developer The container has an opening, and is arranged so that a part of the outer peripheral surface of the developer carrying member faces the opening and the magnetic developer and the outer peripheral surface are in contact with each other. Wherein the magnetic force of the magnet roll by attaching the magnetic developer, the tip of the a rotational direction downstream of the developer carrying member in the vicinity of the opening blade is arranged to abut a further said plate spring The rubber material is disposed so as to be separated from the downstream side in the rotation direction of the developer carrying member to bring the rubber material into contact with the surface, and the contact per unit contact length at the contact position of the blade with the developer carrying member. The linear pressure is in the range of 60 g / cm to 80 g / cm, the contact width of the blade in the rotation direction of the developer carrier is 4 mm to 6 mm, and the contact surface pressure of the blade with respect to the developer carrier said magnetic said blade by the magnetic force of the magnet roll conditions but is within the range of 100 g / cm or more 200 g / cm The developer is adhered is contacted to the developer carrying member, the toner charge amount of the surface of said developer carrying member after the blade passes is in the range of -3μCoul / g of -3.6μCoul / g Features.
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 or 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
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
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
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
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
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
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
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 that the toner is destroyed. 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 was found that a good image quality without sleeve ghost or density reduction can be obtained by limiting the contact surface pressure to a range of 100 to 200 g / cm 2 .
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
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, image quality without sleeve ghost or density reduction could be confirmed.
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
Claims (7)
前記ブレードはゴム硬度が40度〜70度のウレタンゴムまたはシリコンゴムのゴム材を板ばねの先端に接着固定したものであり、
前記現像剤容器は開口部を有し、前記開口部に前記現像剤担持体の外周面の一部が臨み前記磁性現像剤と前記外周面が接触するように配置され、前記開口部において前記表面に前記マグネットロールの磁力により前記磁性現像剤を付着させ、
前記現像剤担持体の回転方向下流であって前記開口部の近傍に前記ブレードの先端が当接するように配置し、さらに前記板ばねを前記現像剤担持体の回転方向下流側に離間するように傾けて配置して前記ゴム材を前記表面に接触させ、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60g/cmから80g/cmの範囲であり、かつ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4mmから6mmであり、かつ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/平方センチメートル以上200g/平方センチメートル以下の範囲内である条件で前記ブレードを前記マグネットロールの磁力により前記磁性現像剤が付着した前記現像剤担持体に接触させ、前記ブレード通過後の前記現像剤担持体の前記表面のトナー帯電量が−3μCoul/gから−3.6μCoul/gの範囲内であることを特徴とする現像装置。 A developer container for storing a magnetic developer; a cylindrical developer carrier having a magnet roll therein; and the magnetic developer carried on the surface by the magnetic force of the magnet roll ; and the developer carrier. arranged to contact the surface, the have a blade for regulating the thickness for the surface of the magnetic developer, the magnetic developer carried on the surface of the developer carrying member is charged by the blade development In the device
The blade is obtained by adhering and fixing a rubber material of urethane rubber or silicon rubber having a rubber hardness of 40 degrees to 70 degrees to the tip of a leaf spring,
The developer container has an opening, and is arranged so that a part of the outer peripheral surface of the developer carrying member faces the opening and the magnetic developer and the outer peripheral surface are in contact with each other. The magnetic developer is attached by the magnetic force of the magnet roll,
The blade is disposed so that the tip of the blade is in contact with the opening downstream of the developer carrier and in the vicinity of the opening, and further the leaf spring is spaced downstream of the developer carrier in the rotational direction. The rubber material is brought into contact with the surface by being inclined, and the contact linear pressure per unit contact length at the contact position of the blade with the developer carrying member is in the range of 60 g / cm to 80 g / cm, The contact width of the blade in the rotation direction of the developer carrier is 4 mm to 6 mm, and the contact surface pressure of the blade to the developer carrier is in the range of 100 g / square centimeter to 200 g / square centimeter. in contacting the blade on the developer carrying member, wherein the magnetic developer is adhered by the magnetic force of the magnet roll, the blade passing A developing device having the toner charge amount of the surface of said developer carrying member is characterized in that in the range of -3μCoul / g of -3.6μCoul / g.
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,
A magnetic field generating means having six magnetic poles is fixed along the inner periphery of the developer carrying body, 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.
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.
前記ブレードはゴム硬度が40度〜70度のウレタンゴムまたはシリコンゴムのゴム材を板ばねの先端に接着固定したものであり、前記現像剤容器は開口部を有し、前記開口部に前記現像剤担持体の外周面の一部が臨み前記磁性現像剤と前記外周面が接触するように配置され、前記開口部において前記表面に前記マグネットロールの磁力により前記磁性現像剤を付着させ、前記現像剤担持体の回転方向下流であって前記開口部の近傍に前記ブレードの先端が当接するように配置し、さらに前記板ばねを前記現像剤担持体の回転方向下流側に離間するように傾けて配置し、前記ゴム材を前記現像剤担持体の外周面に接触させ、
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60g/cmから80g/cmの範囲であり、かつ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4mmから6mmであり、かつ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/平方センチメートル以上200g/平方センチメートル以下であり、前記ブレードを前記マグネットロールの磁力により前記磁性現像剤が付着した前記現像剤担持体に接触させ、前記ブレード通過後の前記現像剤担持体の前記表面のトナー帯電量が−3μCoul/gから−3.6μCoul/gの範囲内であることを特徴とする現像装置のブレード当接方法。 A developer container for storing a magnetic developer, a cylindrical developer carrying member which rotates in carrying the magnetic developer on the surface by the magnetic force of the magnet roll having a magnet roll in the interior, of the magnetic developer have a blade for regulating the thickness to the surface of said developer carrying member, in the developing device in which the magnetic developer carried on the surface of the developer carrying member is charged by the blade, the surface of the developer carrying member In the blade contact method when contacting the blade to
The blade is formed by adhering and fixing a rubber material of urethane rubber or silicon rubber having a rubber hardness of 40 degrees to 70 degrees to a tip of a leaf spring, and the developer container has an opening , and the developer is formed in the opening A part of the outer peripheral surface of the agent carrying member is arranged so that the magnetic developer and the outer peripheral surface are in contact with each other, and the magnetic developer is attached to the surface by the magnetic force of the magnet roll at the opening, and The blade is arranged so that the tip of the blade is in contact with the opening in the rotation direction of the developer carrier and in the vicinity of the opening. Placing the rubber material in contact with the outer peripheral surface of the developer carrier,
The contact linear pressure per unit contact length at the contact position of the blade with the developer carrier is in the range of 60 g / cm to 80 g / cm, and the contact width of the blade in the rotation direction of the developer carrier. It said There is 6mm from 4 mm, and the contact surface pressure with respect to the developer carrying member of the blade Ri 100 g / cm or more 200 g / cm der hereinafter that the magnetic developer by the magnetic force of the magnet roll the blade is attached contacting the developer carrying member, a developing device, wherein the toner charge amount of the surface of said developer carrying member after the blade passes is in the range of -3μCoul / g of -3.6μCoul / g Blade contact method.
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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 |
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