JP2012255950A - Developing device, and image forming apparatus including the developing device - Google Patents
Developing device, and image forming apparatus including the developing device Download PDFInfo
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- JP2012255950A JP2012255950A JP2011129668A JP2011129668A JP2012255950A JP 2012255950 A JP2012255950 A JP 2012255950A JP 2011129668 A JP2011129668 A JP 2011129668A JP 2011129668 A JP2011129668 A JP 2011129668A JP 2012255950 A JP2012255950 A JP 2012255950A
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Abstract
Description
本発明は、現像装置、及び該現像装置を備えた画像形成装置に関する。 The present invention relates to a developing device and an image forming apparatus including the developing device.
トナーを表面に担持して回転軸を中心として回転する現像ローラと、現像ローラに圧接してトナーの層厚を規制する規制部材を備え、規制部材で規制されたのち搬送されるトナーで、現像ローラと対向配置される感光体上の静電潜像を可視化する現像装置では、現像ローラの長手方向端部から現像装置の外へトナーが漏れ出す問題点が指摘されている。 A developing roller that carries toner on its surface and rotates about a rotation axis, and a regulating member that regulates the toner layer thickness by being pressed against the developing roller, are developed with toner that is conveyed after being regulated by the regulating member In a developing device that visualizes an electrostatic latent image on a photoconductor disposed opposite to a roller, a problem has been pointed out that toner leaks from the end of the developing roller in the longitudinal direction to the outside of the developing device.
このような問題を解消するため、通常、現像ローラの長手方向端部からトナーが漏れ出さないように、現像ローラの長手方向端部の外周面にシール部材を配設している。しかし、シール部材では、トナーを漏れ出さないように塞き止めることができる反面、シール部材で塞き止められて滞留したトナーが凝集する場合があった。 In order to solve such a problem, a seal member is usually disposed on the outer peripheral surface of the end portion in the longitudinal direction of the developing roller so that the toner does not leak from the end portion in the longitudinal direction of the developing roller. However, with the seal member, the toner can be blocked so as not to leak out, but the toner staying blocked by the seal member may be aggregated.
このような問題に対処するために、例えば、特開２００５−１８９７４９号公報（特許文献１）では、図３に示すように、現像ローラ１００の端部に多数の溝１０１を現像ローラ１００の周方向に対して角度をなして形成している。このことで、現像ローラ１００が回転して、端部のシール部材１０２によって、トナーが塞き止められる領域Ｒで滞留するまえに、多数の溝１０１に引っ掛けられた状態で、領域Ｒからトナーが搬送される。したがって、トナーが滞留して凝集することはない。 In order to cope with such a problem, for example, in JP-A-2005-189749 (Patent Document 1), as shown in FIG. It forms at an angle with respect to the direction. As a result, the developing roller 100 rotates and the toner from the region R stays in the groove 101 before being retained in the region R where the toner is blocked by the end seal member 102. Be transported. Therefore, the toner does not stay and aggregate.
しかしながら、特許文献１の構成では、トナーが領域Ｒで滞留することはないが、多数の溝１０１はシール部材１０２に覆われた場所にも形成されており、このような場所にトナーが詰まり、現像ローラ１００の端部から現像装置の外へトナーが漏れ出す場合があった。 However, in the configuration of Patent Document 1, the toner does not stay in the region R, but a large number of grooves 101 are also formed in a place covered with the seal member 102, and the toner is clogged in such a place. In some cases, the toner leaks from the end of the developing roller 100 to the outside of the developing device.
本発明は上記の課題に鑑みてなされたものであり、現像ローラ両端に現像ローラの周方向全周にわたって溝を設けることで、現像ローラ１００の両端から現像装置の外へトナーが溢れ出さない現像装置、及び該現像装置を備えた画像形成装置を提供することにある。 The present invention has been made in view of the above-described problems. By providing grooves at both ends of the developing roller over the entire circumference in the circumferential direction of the developing roller, development in which toner does not overflow from the both ends of the developing roller 100 to the outside of the developing device. An apparatus and an image forming apparatus including the developing device are provided.
本発明は、トナーを表面に担持して回転する現像ローラと、該現像ローラを圧接する規制部材を備え、該規制部材の前記現像ローラ側の先端を前記現像ローラに圧接する現像装置において、前記現像ローラ両端には、前記現像ローラの周方向全周にわたり溝が設けられていることを特徴とするものである。 The present invention includes a developing roller that carries toner on its surface and rotates, and a regulating member that presses the developing roller, and a developing device that presses the tip of the regulating member on the developing roller side against the developing roller, Grooves are provided at both ends of the developing roller over the entire circumferential direction of the developing roller.
また、本発明は、前記溝は、前記現像ローラの非画像領域に配設されていることが好ましい。 In the present invention, it is preferable that the groove is disposed in a non-image area of the developing roller.
また、本発明は、前記溝の前記トナーを掻き出し、前記現像装置に回収する掻き出し部材が配設されていることが好ましい。 In the present invention, it is preferable that a scraping member that scrapes out the toner in the groove and collects the toner in the developing device is provided.
また、本発明は、前記現像装置を備えた画像形成装置を提供することを特徴とするものである。 The present invention also provides an image forming apparatus provided with the developing device.
本発明によれば、現像ローラ両端に現像ローラの周方向全周にわたって溝が設けられているため、現像ローラの両端から現像装置の外へトナーが漏れ出すことはない。 According to the present invention, since the grooves are provided at both ends of the developing roller in the circumferential direction of the developing roller, the toner does not leak out of the developing device from both ends of the developing roller.
以下、本発明の実施形態の現像装置について図面を参照して説明する。 Hereinafter, a developing device according to an embodiment of the present invention will be described with reference to the drawings.
図１は、本発明の現像装置１の構成を示す概略断面図である。以下には、本発明の現像装置に関して説明するが、その他の構成については、電子写真複写装置の一般的な技術が適用できることはいうまでもない。 FIG. 1 is a schematic cross-sectional view showing the configuration of the developing device 1 of the present invention. In the following, the developing device of the present invention will be described, but it goes without saying that a general technique of an electrophotographic copying apparatus can be applied to other configurations.
本発明の現像装置１は、トナーを感光体２表面の静電潜像に供給して静電潜像を現像する現像装置である。現像装置１は、トナーを収容する現像槽３と、トナーを担持して感光体２表面に搬送する現像ローラ４と、トナーを現像ローラ４上に供給する供給ローラ５と、現像ローラ４上のトナーの層厚を規制する規制部材としてのドクターブレード６と、ドクターブレード６を現像槽３に支持する支持部材７を含む。現像ローラ４、供給ローラ５は、現像槽３内に回転自在に設けられ、矢印で示す反時計方向に回転している。 The developing device 1 of the present invention is a developing device that develops an electrostatic latent image by supplying toner to the electrostatic latent image on the surface of the photoreceptor 2. The developing device 1 includes a developing tank 3 that contains toner, a developing roller 4 that carries the toner and conveys the toner to the surface of the photoreceptor 2, a supply roller 5 that supplies the toner onto the developing roller 4, and a developing roller 4 A doctor blade 6 as a regulating member that regulates the toner layer thickness and a support member 7 that supports the doctor blade 6 in the developing tank 3 are included. The developing roller 4 and the supply roller 5 are rotatably provided in the developing tank 3 and are rotated counterclockwise as indicated by arrows.
感光体２は、直径３０ｍｍであり、対向して配設されている現像ローラ４との間隙は、不図示の間隙保持部材により、２００±２０μｍに設定されている。感光体２の回転方向は、矢印で示す時計方向であり、周速度は、１５０ｍｍ／ｓｅｃとした。 The photosensitive member 2 has a diameter of 30 mm, and the gap with the developing roller 4 disposed to face the photosensitive member 2 is set to 200 ± 20 μm by a gap holding member (not shown). The rotation direction of the photoconductor 2 was a clockwise direction indicated by an arrow, and the peripheral speed was 150 mm / sec.
現像槽３は、例えば、硬質の合成樹脂等からなり、外観が略直方体形状を有する容器部材である。 The developing tank 3 is a container member made of, for example, a hard synthetic resin and having an approximately rectangular parallelepiped appearance.
現像ローラ４は、不図示の金属製の芯金の表面にウレタンゴムが設けられたものであり、直径１６ｍｍ、幅３３３ｍｍ、ＪＩＳ−Ａ硬度６０〜７０°、抵抗値１０６Ωｃｍに設定されている。周速度は１４５ｍｍ／ｓｅｃとした。 The developing roller 4 is provided with urethane rubber on the surface of a metal core (not shown), and is set to have a diameter of 16 mm, a width of 333 mm, a JIS-A hardness of 60 to 70 °, and a resistance value of 10 6 Ωcm. Yes. The peripheral speed was 145 mm / sec.
なお、現像ローラ４の軸方向両端で感光体２に現像されずに残ったトナーが現像槽３の外へ漏れ出さないようにし、現像槽３内部に回収するため、現像ローラ４の軸方向両端と現像槽３鉛直方向下部の間隙に掻き出し部材ｗを設けた。 It should be noted that the toner remaining on the photosensitive member 2 without being developed at the both ends in the axial direction of the developing roller 4 is prevented from leaking out of the developing tank 3 and collected in the developing tank 3 so that both ends in the axial direction of the developing roller 4 are collected. And a scraping member w was provided in the gap in the lower part of the developing tank 3 in the vertical direction.
供給ローラ５は、不図示の金属製の芯金の表面に発泡ウレタン等の多孔性弾性部材が設けられたものであり、表面の空孔にトナーを吸着しつつ、現像ローラ４を摺擦することで、トナーを現像ローラ４に供給し、かつ、現像後に現像ローラ４に残存した余分のトナーをクリーニングする。供給ローラ５と現像ローラ４の対向する箇所の長手方向、即ち供給ローラ５の軸線方向の幅は、３３３ｍｍで設定されている。供給ローラ５は、直径１４ｍｍ、発泡密度３個／ｍｍ、アスカーＣ硬度５°、抵抗値１０５Ωｃｍ、周速度１４５ｍｍ／ｓｅｃとした。 The supply roller 5 is provided with a porous elastic member such as urethane foam on the surface of a metal core (not shown), and slidably rubs the developing roller 4 while adsorbing toner to the holes on the surface. Thus, the toner is supplied to the developing roller 4 and the excess toner remaining on the developing roller 4 after the development is cleaned. The longitudinal direction of the portion where the supply roller 5 and the developing roller 4 face each other, that is, the width in the axial direction of the supply roller 5 is set to 333 mm. The supply roller 5 had a diameter of 14 mm, a foam density of 3 pieces / mm, an Asker C hardness of 5 °, a resistance value of 10 5 Ωcm, and a peripheral speed of 145 mm / sec.
なお、本発明では、トナーとして、ポリエステル樹脂を主成分とし、粉砕法で作製され、体積平均粒子径が８．５μｍのトナーを用いた。 In the present invention, a toner having a polyester resin as a main component and prepared by a pulverization method and having a volume average particle diameter of 8.5 μm is used as the toner.
ドクターブレード６は、現像ローラ４の軸線方向に平行に延びる板状部材である。ドクターブレード６の現像ローラ４側の先端は現像ローラ４に圧接され、もう一方の先端は、支持部材７が配設され、現像槽３本体に固定されている。ドクターブレード６を現像ローラ４に圧接させる線圧は、３０〜１５０ｇｆ／ｃｍに設定される。ドクターブレード６は薄く、バネ性を有した金属板金である。線圧は、ドクターブレード６の板厚により変更可能である。線圧が３０ｇｆ／ｃｍ未満であれば、現像ローラ４上のトナーの層厚が均一にならず、トナーに充分な帯電が付与できない。逆に、線圧が１５０ｇｆ／ｃｍより大きくなると、現像ローラ４上のトナーへの負荷が大きくなり、トナーの融着等による画像欠陥が発生する。本発明では、線圧８０ｇｆ／ｃｍとした。これにより、現像ローラ４上に一定の帯電を有したトナーの層が担持される。この帯電した電荷を有するトナーの層が、現像ローラ４と感光体２との電位差に応じて、現像ローラ４から感光体２に供給されて静電潜像を現像し、トナー像を形成する。 The doctor blade 6 is a plate-like member that extends parallel to the axial direction of the developing roller 4. The tip of the doctor blade 6 on the developing roller 4 side is pressed against the developing roller 4, and the other tip is provided with a support member 7 and fixed to the main body of the developing tank 3. The linear pressure that presses the doctor blade 6 against the developing roller 4 is set to 30 to 150 gf / cm. The doctor blade 6 is a thin metal plate having a spring property. The linear pressure can be changed by the thickness of the doctor blade 6. If the linear pressure is less than 30 gf / cm, the toner layer thickness on the developing roller 4 is not uniform, and sufficient charge cannot be imparted to the toner. On the other hand, when the linear pressure exceeds 150 gf / cm, the load on the toner on the developing roller 4 increases and image defects due to toner fusion occur. In the present invention, the linear pressure is 80 gf / cm. As a result, a toner layer having a constant charge is carried on the developing roller 4. The charged toner layer is supplied from the developing roller 4 to the photoconductor 2 in accordance with the potential difference between the developing roller 4 and the photoconductor 2 to develop the electrostatic latent image to form a toner image.
ドクターブレード６を構成する材料としては、リン青銅板、ステンレス板、ベリリウム銅板等を挙げることができる。本発明では、厚みが０．１０ｍｍのステンレス板とし、長さ３５ｍｍ、長手方向の幅２９７ｍｍに設定した。また、このときの現像ローラ４上のトナーの層厚は、０．６〜０．８ｍｇ／ｃｍ２の範囲であった。 Examples of the material constituting the doctor blade 6 include a phosphor bronze plate, a stainless plate, and a beryllium copper plate. In the present invention, a stainless steel plate having a thickness of 0.10 mm is set to have a length of 35 mm and a longitudinal width of 297 mm. Further, the layer thickness of the toner on the developing roller 4 at this time was in the range of 0.6 to 0.8 mg / cm 2 .
図２は、本発明の実施例である現像ローラ４周辺を現像装置１上方から見た概略図である。 FIG. 2 is a schematic view of the periphery of the developing roller 4 according to the embodiment of the present invention as viewed from above the developing device 1.
現像ローラ４両端には現像ローラ４の周方向全周にわたって溝８が形成されている。そのため、漏れ出したトナーは塞き止められることなく溝８に導かれる。その後、導かれたトナーが溝８から漏れそうになっても、掻き出し部材ｗによって、現像槽３内に回収され、再度、現像ローラ４上に搬送することができる。 Grooves 8 are formed at both ends of the developing roller 4 over the entire circumference of the developing roller 4 in the circumferential direction. Therefore, the leaked toner is guided to the groove 8 without being blocked. Thereafter, even if the introduced toner is likely to leak from the groove 8, the toner is collected in the developing tank 3 by the scraping member w and can be conveyed onto the developing roller 4 again.
また、シール部材で塞き止められた場合、トナーはシール部材との負荷によって流動性が低下し、凝集してしまうが、本発明では、シール部材が配設されていないため、トナーの流動性が低下し、凝集することはない。 In addition, when the toner is blocked by the seal member, the toner is reduced in fluidity due to a load with the seal member and aggregates. However, in the present invention, since the seal member is not provided, the toner fluidity is reduced. Decreases and does not agglomerate.
また、このように、トナーが凝集しないため、現像ローラ４の表面のトナーの層厚も均一となり、出力画像上で画像かぶりや濃度むらを発生することがない。 In addition, since the toner does not aggregate as described above, the toner layer thickness on the surface of the developing roller 4 becomes uniform, and image fogging and uneven density are not generated on the output image.
さらに、溝８は、現像ローラ４の非画像領域に配設されているため、出力画像上にトナーが飛散することもない。 Further, since the groove 8 is disposed in the non-image area of the developing roller 4, the toner does not scatter on the output image.
なお、溝８の形状は凹型、Ｖ字型、Ｕ字型等で深さや横幅は特に限定されない。溝８を形成する手段としては、一般的に用いられる研削加工、ダイヤモンドカッタ等による切削加工、薬剤を用いたエッチング加工等が使用できる。 The shape of the groove 8 is concave, V-shaped, U-shaped, etc., and the depth and width are not particularly limited. As a means for forming the groove 8, a generally used grinding process, a cutting process using a diamond cutter or the like, an etching process using a chemical agent, or the like can be used.
１ 現像装置
２ 感光体
３ 現像槽
４ 現像ローラ
５ 供給ローラ
６ ドクターブレード
７ 支持部材
８ 溝
ｗ 掻き出し部材
DESCRIPTION OF SYMBOLS 1 Developing device 2 Photoconductor 3 Developing tank 4 Developing roller 5 Supply roller 6 Doctor blade 7 Support member 8 Groove w Scraping member
Claims (4)
前記現像ローラ両端には、前記現像ローラの周方向全周にわたり溝が設けられていることを特徴とする現像装置。 In a developing device comprising a developing roller that carries toner on its surface and rotates, and a regulating member that presses the developing roller, and the tip of the regulating member on the developing roller side is pressed against the developing roller.
A developing device characterized in that grooves are provided at both ends of the developing roller over the entire circumference in the circumferential direction of the developing roller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011129668A JP2012255950A (en) | 2011-06-10 | 2011-06-10 | Developing device, and image forming apparatus including the developing device |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2011129668A JP2012255950A (en) | 2011-06-10 | 2011-06-10 | Developing device, and image forming apparatus including the developing device |
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| JP2012255950A true JP2012255950A (en) | 2012-12-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472697A (en) * | 2013-09-12 | 2013-12-25 | 珠海天威飞马打印耗材有限公司 | Developing roller and developing box |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472697A (en) * | 2013-09-12 | 2013-12-25 | 珠海天威飞马打印耗材有限公司 | Developing roller and developing box |
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