JP2015072348A - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP2015072348A
JP2015072348A JP2013207565A JP2013207565A JP2015072348A JP 2015072348 A JP2015072348 A JP 2015072348A JP 2013207565 A JP2013207565 A JP 2013207565A JP 2013207565 A JP2013207565 A JP 2013207565A JP 2015072348 A JP2015072348 A JP 2015072348A
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power supply
volume resistance
resistance value
roller
transfer roller
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JP6111963B2 (en
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小野　雅人
Masato Ono
雅人 小野
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus that can suppress deterioration of a transfer member due to discharge from a power supply member.SOLUTION: An image forming apparatus 1 includes a transfer member 15 that has a conductive core shaft and an ion conductive foam wound around the core shaft and transfers toner images onto recording media, and a power supply member 16 that is in contact with the transfer member 15 and supplies a transfer current to the transfer member 15, where the difference between the volume resistance value of the transfer member 15 and the volume resistance value of the power supply member 16 is 1.0 logΩ cm or less.

Description

本発明は、画像形成装置に関する。   The present invention relates to an image forming apparatus.

従来より、転写ローラと、転写ローラの軸心を経由して転写ニップに転写バイアス電流を流す給電ローラと備える画像形成装置が知られている（特許文献１参照）。   2. Description of the Related Art Conventionally, there has been known an image forming apparatus including a transfer roller and a power supply roller that supplies a transfer bias current to a transfer nip via an axis of the transfer roller (see Patent Document 1).

特開２００７−２５６８６０号公報JP 2007-256860 A

本発明の目的は、給電部材の放電による転写部材の劣化を抑制することができる画像形成装置を提供することにある。   An object of the present invention is to provide an image forming apparatus capable of suppressing deterioration of a transfer member due to discharge of a power supply member.

上記目的を達成するため、請求項１の画像形成装置は、導電性の芯軸及び当該芯軸に巻装されるイオン導電性の発泡体を有し、トナー像を記録媒体上に転写する転写部材と、前記転写部材と当接すると共に、前記転写部材に転写電流を供給する給電部材とを備え、前記転写部材の体積抵抗値と前記給電部材の体積抵抗値との差分が１．０ｌｏｇΩ・ｃｍ以下であることを特徴とする。   In order to achieve the above object, an image forming apparatus according to claim 1 has a conductive core shaft and an ion conductive foam wound around the core shaft, and transfers the toner image onto a recording medium. A power supply member that contacts the transfer member and supplies a transfer current to the transfer member, and the difference between the volume resistance value of the transfer member and the volume resistance value of the power supply member is 1.0 log Ω · cm It is characterized by the following.

請求項２の画像形成装置は、請求項１記載の画像形成装置において、前記転写部材の体積抵抗値と前記給電部材の体積抵抗値との差分が０．５ｌｏｇΩ・ｃｍ以下であることを特徴とする。   The image forming apparatus according to claim 2 is the image forming apparatus according to claim 1, wherein a difference between a volume resistance value of the transfer member and a volume resistance value of the power supply member is 0.5 log Ω · cm or less. To do.

請求項３の画像形成装置は、前記転写部材の体積抵抗値が、６．０〜８．０ｌｏｇΩ・ｃｍであることを特徴とする。 According to a third aspect of the present invention, the volume resistance value of the transfer member is 6.0 to 8.0 log Ω · cm.

請求項１の発明によれば、本発明を用いない場合に比べて、給電部材の放電による転写部材の劣化を抑制することができる。   According to the first aspect of the present invention, the deterioration of the transfer member due to the discharge of the power feeding member can be suppressed as compared with the case where the present invention is not used.

請求項２の発明によれば、転写部材の体積抵抗値と給電部材の体積抵抗値との差分が０．５ｌｏｇΩ・ｃｍより大きく１．０ｌｏｇΩ・ｃｍ以下である場合と比べて、給電部材の放電による転写部材の劣化を抑制することができる。   According to the second aspect of the present invention, compared with the case where the difference between the volume resistance value of the transfer member and the volume resistance value of the power supply member is greater than 0.5 logΩ · cm and less than or equal to 1.0 logΩ · cm, the discharge of the power supply member It is possible to suppress deterioration of the transfer member due to.

請求項３の発明によれば、体積抵抗値が６．０〜８．０ｌｏｇΩ・ｃｍの転写部材を用いても、本発明を用いない場合に比べて給電部材の放電による転写部材の抵抗値の上昇を抑制することができる。   According to the invention of claim 3, even when a transfer member having a volume resistance value of 6.0 to 8.0 log Ω · cm is used, the resistance value of the transfer member due to the discharge of the power feeding member can be reduced as compared with the case where the present invention is not used. The rise can be suppressed.

本実施形態にかかる画像形成装置の構成図である。1 is a configuration diagram of an image forming apparatus according to an embodiment. （Ａ）は、二次転写ローラの概略構成図である。（Ｂ）は、給電ローラの概略構成図である。(A) is a schematic block diagram of a secondary transfer roller. (B) is a schematic block diagram of a feed roller. 実施例１〜５及び比較例１〜３の各々に関する二次転写ローラの体積抵抗値、給電ローラの体積抵抗値、体積抵抗値の差分及び二次転写ローラの劣化の関係を示す図である。It is a figure which shows the relationship between the volume resistance value of the secondary transfer roller regarding each of Examples 1-5 and Comparative Examples 1-3, the volume resistance value of a feeding roller, the difference of a volume resistance value, and deterioration of a secondary transfer roller. （Ａ）は図１の画像形成装置の第１変形例を示す図である。（Ｂ）は図１の画像形成装置の第２変形例を示す図である。FIG. 9A is a diagram illustrating a first modification of the image forming apparatus in FIG. 1. (B) is a diagram showing a second modification of the image forming apparatus of FIG.

以下、図面を参照しながら本発明の実施の形態を説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、本実施形態にかかる画像形成装置の構成図である。   FIG. 1 is a configuration diagram of an image forming apparatus according to the present embodiment.

図１の画像形成装置１は、例えば、複合機であるが、プリンタ、コピー機又はファクシミリ装置でもよい。画像形成装置１は、中間転写ベルト２１と、像担持体としての感光体ドラム１０と、感光体ドラム１０の表面を一様に帯電する帯電ローラ１１と、感光体ドラム１０上に静電潜像を形成する露光装置１２と、静電潜像に応じたトナー像を形成する現像器１３と、当該トナー像を中間転写ベルト２１に転写し、当該中間転写ベルト２１を搬送する一次転写ローラ１４とを備えている。さらに、画像形成装置１は、一次転写ローラ１４上のトナー像を用紙Ｓに転写する転写部材としての二次転写ローラ１５、二次転写ローラ１５に転写電流を供給する給電部材としての給電ローラ１６、給電ローラ１６に電圧を印加する転写バイアス電源（即ちＤＣ電源）１７と、二次転写ローラ１５と対向して配置されるバックアップローラ１８と、２つの搬送ローラ２０とを備えている。   The image forming apparatus 1 in FIG. 1 is, for example, a multifunction machine, but may be a printer, a copier, or a facsimile machine. The image forming apparatus 1 includes an intermediate transfer belt 21, a photosensitive drum 10 as an image carrier, a charging roller 11 that uniformly charges the surface of the photosensitive drum 10, and an electrostatic latent image on the photosensitive drum 10. An exposure device 12 that forms a toner image, a developing device 13 that forms a toner image corresponding to the electrostatic latent image, a primary transfer roller 14 that transfers the toner image to the intermediate transfer belt 21 and conveys the intermediate transfer belt 21. It has. Further, the image forming apparatus 1 includes a secondary transfer roller 15 as a transfer member that transfers the toner image on the primary transfer roller 14 to the paper S, and a power supply roller 16 as a power supply member that supplies a transfer current to the secondary transfer roller 15. A transfer bias power source (that is, a DC power source) 17 for applying a voltage to the power supply roller 16, a backup roller 18 disposed opposite to the secondary transfer roller 15, and two transport rollers 20 are provided.

トナー像は、負極性に帯電される。給電ローラ１６はトナー像と逆極性の電圧（即ち正極性の電圧）が印加されている。転写バイアス電源１７は、給電ローラ１６とバックアップローラ１８に接続されており、給電ローラ１６に二次転写用の電圧を印加する。二次転写ローラ１５の体積抵抗値は、６．０〜８．０ｌｏｇΩ・ｃｍ（いわゆる中抵抗領域）である。   The toner image is negatively charged. A voltage having a polarity opposite to that of the toner image (that is, a positive polarity voltage) is applied to the power supply roller 16. The transfer bias power supply 17 is connected to the power supply roller 16 and the backup roller 18 and applies a voltage for secondary transfer to the power supply roller 16. The volume resistance value of the secondary transfer roller 15 is 6.0 to 8.0 log Ω · cm (so-called medium resistance region).

中間転写ベルト２１は、２つの搬送ローラ２０及びバックアップローラ１８によって張架され、矢印Ｃ方向に移動する。中間転写ベルト２１に転写されたトナー像は、バックアップローラ１８及び二次転写ローラ１５によって用紙Ｓに転写される。感光体ドラム１０は矢印Ａ方向に回転駆動され、トナー像が形成された用紙Ｓは矢印Ｂ方向に搬送される。   The intermediate transfer belt 21 is stretched by the two conveying rollers 20 and the backup roller 18 and moves in the direction of arrow C. The toner image transferred to the intermediate transfer belt 21 is transferred onto the paper S by the backup roller 18 and the secondary transfer roller 15. The photosensitive drum 10 is rotationally driven in the arrow A direction, and the sheet S on which the toner image is formed is conveyed in the arrow B direction.

ところで、二次転写ローラ１５と給電ローラ１６との体積抵抗値の差が大きいと、二次転写ローラ１５と給電ローラ１６との分圧が変わり、二次転写ローラ１５と給電ローラ１６との表面電位の差が大きくなり、給電ローラ１６が放電しやすくなる。この給電ローラ１６からの放電により二次転写ローラ１５の表面が劣化し、二次転写ローラ１５の耐久性が悪化する。例えば、二次転写ローラ１５の表面が劣化すると、二次転写ローラ１５の表面に割れやヒビが生じる。この現象は、特に中抵抗領域の二次転写ローラ１５で起こりやすい。   By the way, if the difference in volume resistance between the secondary transfer roller 15 and the power supply roller 16 is large, the partial pressure between the secondary transfer roller 15 and the power supply roller 16 changes, and the surface of the secondary transfer roller 15 and the power supply roller 16 is changed. The difference in potential increases, and the power supply roller 16 is easily discharged. Due to the discharge from the power supply roller 16, the surface of the secondary transfer roller 15 is deteriorated, and the durability of the secondary transfer roller 15 is deteriorated. For example, when the surface of the secondary transfer roller 15 is deteriorated, the surface of the secondary transfer roller 15 is cracked or cracked. This phenomenon is particularly likely to occur in the secondary transfer roller 15 in the middle resistance region.

そこで、本発明者は、二次転写ローラ１５と給電ローラ１６との体積抵抗値の差を小さくすることで、二次転写ローラ１５と給電ローラ１６との表面電位の差を小さくし、給電ローラ１６の放電を抑制することを考案した。   Therefore, the present inventor reduces the difference in the surface resistance between the secondary transfer roller 15 and the power supply roller 16 by reducing the difference in volume resistance between the secondary transfer roller 15 and the power supply roller 16. It was devised to suppress 16 discharges.

以下、発明者が行った実施例及び比較例の実験について説明する。   Hereinafter, experiments of the examples and comparative examples conducted by the inventors will be described.

（実施例１）
二次転写ローラ１５は、図２（Ａ）に示すように、直径８ｍｍの金属の芯軸１０１と当該金属の芯軸の周囲に巻装される発泡性のゴム１０２とで構成した。発泡性のゴム１０２は、イオン導電剤を添加した、ニトリルゴム及びエピクロルヒドリンゴムの混成物である。この混成物を厚さ５ｍｍで押し出し製法により成形及び加硫を行い、その成形された混成物を金属の芯軸１０１の外周に巻装した。以上のように作成された二次転写ローラ１５の体積抵抗値を常温常湿（ＪＩＳ規格に規定されている温度５−３５℃及び湿度４５−８５％）下で測定すると、二次転写ローラ１５の体積抵抗値は７．５ｌｏｇΩ・ｃｍであった。 (Example 1)
As shown in FIG. 2A, the secondary transfer roller 15 is composed of a metal core shaft 101 having a diameter of 8 mm and a foamable rubber 102 wound around the metal core shaft. The foamable rubber 102 is a hybrid of nitrile rubber and epichlorohydrin rubber to which an ionic conductive agent is added. The composite was molded and vulcanized by an extrusion method with a thickness of 5 mm, and the molded composite was wound around the outer periphery of the metal core shaft 101. When the volume resistance value of the secondary transfer roller 15 produced as described above is measured under normal temperature and normal humidity (temperature 5-35 ° C. and humidity 45-85% as defined in JIS standards), the secondary transfer roller 15 is measured. The volume resistance of was 7.5 log Ω · cm.

給電ローラ１６は、図２（Ｂ）に示すように、直径６ｍｍの金属の芯軸１０３と当該金属の芯軸の周囲に巻装される発泡性のゴム１０４とで構成した。発泡性のゴム１０４は、イオン導電剤を添加した、ニトリルゴム及びエピクロルヒドリンゴムの混成物である。この混成物を厚さ３ｍｍで押し出し製法により成形及び加硫を行い、その成形された混成物を金属の芯軸１０３の外周に巻装した。以上のように作成された給電ローラ１６の体積抵抗値を常温常湿下で測定すると、給電ローラ１６の体積抵抗値は７．５ｌｏｇΩ・ｃｍであった。   As shown in FIG. 2B, the power supply roller 16 is composed of a metal core shaft 103 having a diameter of 6 mm and a foamable rubber 104 wound around the metal core shaft. The foamable rubber 104 is a hybrid of nitrile rubber and epichlorohydrin rubber to which an ionic conductive agent is added. The composite was molded and vulcanized by an extrusion method with a thickness of 3 mm, and the molded composite was wound around the outer periphery of the metal core shaft 103. When the volume resistance value of the power supply roller 16 produced as described above was measured under normal temperature and normal humidity, the volume resistance value of the power supply roller 16 was 7.5 log Ω · cm.

本発明者は、上述のように作成された二次転写ローラ１５及び給電ローラ１６を画像形成装置１に装着し、公知の標準テストチャートを３０万枚印刷した。その後、ハーフトーンの評価画像を印刷して、本発明者は、印刷されたハーフトーンの評価画像の濃淡、色むら及び色抜けなどに基づいて二次転写ローラ１５の劣化を評価した。   The inventor mounted the secondary transfer roller 15 and the power supply roller 16 created as described above on the image forming apparatus 1 and printed 300,000 known standard test charts. Thereafter, the halftone evaluation image was printed, and the present inventor evaluated the deterioration of the secondary transfer roller 15 based on the density, color unevenness, and color loss of the printed halftone evaluation image.

（実施例２）
実施例２では、給電ローラ１６の体積抵抗値を６．５ｌｏｇΩ・ｃｍとした。給電ローラ１６の体積抵抗値を除いて、二次転写ローラ１５及び給電ローラ１６の構成は実施例１の構成と同様である。二次転写ローラ１５の体積抵抗値は実施例１と同様である。 (Example 2)
In Example 2, the volume resistance value of the power supply roller 16 was set to 6.5 log Ω · cm. Except for the volume resistance value of the power supply roller 16, the configurations of the secondary transfer roller 15 and the power supply roller 16 are the same as those of the first embodiment. The volume resistance value of the secondary transfer roller 15 is the same as that in the first embodiment.

給電ローラ１６の体積抵抗値は、ニトリルゴム及びエピクロルヒドリンゴムの混成物に添加されるイオン導電剤の量に応じて変更される。添加されるイオン導電剤の量を増加すれば、給電ローラ１６の体積抵抗値は減少し、添加されるイオン導電剤の量を減らせば、給電ローラ１６の体積抵抗値は増加する。実施例２では、添加されるイオン導電剤の量を実施例１のイオン導電剤の量よりも増加し、実施例１の体積抵抗値よりも給電ローラ１６の体積抵抗値を下げている。尚、ニトリルゴムは高い体積抵抗値を有し、エピクロルヒドリンゴムは低い体積抵抗値を有するので、混成物におけるニトリルゴム及びエピクロルヒドリンゴムの配合比率を変更することにより、給電ローラ１６の体積抵抗値を変更してもよい。   The volume resistance value of the power supply roller 16 is changed according to the amount of the ionic conductive agent added to the hybrid of nitrile rubber and epichlorohydrin rubber. If the amount of the added ionic conductive agent is increased, the volume resistance value of the power supply roller 16 is decreased. If the amount of the added ionic conductive agent is decreased, the volume resistance value of the power supply roller 16 is increased. In Example 2, the amount of the ionic conductive agent added is increased from the amount of the ionic conductive agent of Example 1, and the volume resistance value of the power supply roller 16 is made lower than the volume resistance value of Example 1. In addition, since nitrile rubber has a high volume resistance value and epichlorohydrin rubber has a low volume resistance value, the volume resistance value of the feeding roller 16 is changed by changing the blending ratio of the nitrile rubber and epichlorohydrin rubber in the composite. May be.

本発明者は、上述した実施例１の二次転写ローラ１５の劣化の評価方法と同様の方法を用いて、実施例２の二次転写ローラ１５の劣化を評価した。   The inventor evaluated the deterioration of the secondary transfer roller 15 of Example 2 using the same method as the evaluation method of the deterioration of the secondary transfer roller 15 of Example 1 described above.

（実施例３）
実施例３では、給電ローラ１６の体積抵抗値を７．０ｌｏｇΩ・ｃｍとした。給電ローラ１６の体積抵抗値を除いて、二次転写ローラ１５及び給電ローラ１６の構成は実施例１の構成と同様である。二次転写ローラ１５の体積抵抗値は実施例１と同様である。実施例３では、添加されるイオン導電剤の量を実施例１及び実施例２のイオン導電剤の量の平均値に設定し、給電ローラ１６の体積抵抗値を実施例１及び実施例２の体積抵抗値の平均値とした。本発明者は、上述した実施例１の二次転写ローラ１５の劣化の評価方法と同様の方法を用いて、実施例３の二次転写ローラ１５の劣化を評価した。 (Example 3)
In Example 3, the volume resistance value of the power supply roller 16 was 7.0 log Ω · cm. Except for the volume resistance value of the power supply roller 16, the configurations of the secondary transfer roller 15 and the power supply roller 16 are the same as those of the first embodiment. The volume resistance value of the secondary transfer roller 15 is the same as that in the first embodiment. In Example 3, the amount of ionic conductive agent to be added is set to the average value of the amount of ionic conductive agent of Example 1 and Example 2, and the volume resistance value of the power supply roller 16 is set to that of Example 1 and Example 2. It was set as the average value of the volume resistance value. The inventor evaluated the deterioration of the secondary transfer roller 15 of Example 3 using the same method as the evaluation method of the deterioration of the secondary transfer roller 15 of Example 1 described above.

（実施例４）
実施例４では、給電ローラ１６の体積抵抗値を８．５ｌｏｇΩ・ｃｍとした。給電ローラ１６の体積抵抗値を除いて、二次転写ローラ１５及び給電ローラ１６の構成は実施例１の構成と同様である。二次転写ローラ１５の体積抵抗値は実施例１と同様である。実施例4では、添加されるイオン導電剤の量を実施例１のイオン導電剤の量よりも減少し、実施例１の体積抵抗値よりも給電ローラ１６の体積抵抗値を上げている。本発明者は、上述した実施例１の二次転写ローラ１５の劣化の評価方法と同様の方法を用いて、実施例４の二次転写ローラ１５の劣化を評価した。 Example 4
In Example 4, the volume resistance value of the power supply roller 16 was 8.5 log Ω · cm. Except for the volume resistance value of the power supply roller 16, the configurations of the secondary transfer roller 15 and the power supply roller 16 are the same as those of the first embodiment. The volume resistance value of the secondary transfer roller 15 is the same as that in the first embodiment. In Example 4, the amount of the ionic conductive agent added is smaller than the amount of the ionic conductive agent of Example 1, and the volume resistance value of the power supply roller 16 is set higher than the volume resistance value of Example 1. The inventor evaluated the deterioration of the secondary transfer roller 15 of Example 4 using a method similar to the evaluation method of the deterioration of the secondary transfer roller 15 of Example 1 described above.

（実施例５）
実施例５では、給電ローラ１６の体積抵抗値を８．０ｌｏｇΩ・ｃｍとした。給電ローラ１６の体積抵抗値を除いて、二次転写ローラ１５及び給電ローラ１６の構成は実施例１の構成と同様である。二次転写ローラ１５の体積抵抗値は実施例１と同様である。実施例５では、添加されるイオン導電剤の量を実施例１及び実施例４のイオン導電剤の量の平均値に設定し、給電ローラ１６の体積抵抗値を実施例１及び実施例４の体積抵抗値の平均値とした。本発明者は、上述した実施例１の二次転写ローラ１５の劣化の評価方法と同様の方法を用いて、実施例５の二次転写ローラ１５の劣化を評価した。 (Example 5)
In Example 5, the volume resistance value of the power supply roller 16 was 8.0 log Ω · cm. Except for the volume resistance value of the power supply roller 16, the configurations of the secondary transfer roller 15 and the power supply roller 16 are the same as those of the first embodiment. The volume resistance value of the secondary transfer roller 15 is the same as that in the first embodiment. In Example 5, the amount of the ionic conductive agent added is set to the average value of the amount of the ionic conductive agent of Examples 1 and 4, and the volume resistance value of the power supply roller 16 is set to that of Example 1 and Example 4. It was set as the average value of the volume resistance value. The inventor evaluated the deterioration of the secondary transfer roller 15 of Example 5 using the same method as the evaluation method of the deterioration of the secondary transfer roller 15 of Example 1 described above.

（比較例１）
比較例１では、直径が６ｍｍで体積抵抗値が４．０ｌｏｇΩ・ｃｍ以下である、ステンレス製の金属円柱体を給電ローラ１６として使用した。ここでは、発泡性のゴムが金属円柱体の外周に巻装されていない。本発明者は、上述した実施例１の二次転写ローラ１５の劣化の評価方法と同様の方法を用いて、比較例１の二次転写ローラ１５の劣化を評価した。 (Comparative Example 1)
In Comparative Example 1, a stainless steel metal cylinder having a diameter of 6 mm and a volume resistance value of 4.0 logΩ · cm or less was used as the power supply roller 16. Here, foamable rubber is not wound around the outer periphery of the metal cylinder. The inventor evaluated the deterioration of the secondary transfer roller 15 of Comparative Example 1 using the same method as the evaluation method of the deterioration of the secondary transfer roller 15 of Example 1 described above.

（比較例２）
比較例２では、給電ローラ１６の体積抵抗値を６．０ｌｏｇΩ・ｃｍとした。給電ローラ１６の体積抵抗値を除いて、二次転写ローラ１５及び給電ローラ１６の構成は実施例１の構成と同様である。二次転写ローラ１５の体積抵抗値は実施例１と同様である。比較例２では、添加されるイオン導電剤の量を実施例２のイオン導電剤の量よりも増加し、実施例２の体積抵抗値よりも給電ローラ１６の体積抵抗値を下げている。本発明者は、上述した実施例１の二次転写ローラ１５の劣化の評価方法と同様の方法を用いて、比較例２の二次転写ローラ１５の劣化を評価した。 (Comparative Example 2)
In Comparative Example 2, the volume resistance value of the power supply roller 16 was 6.0 log Ω · cm. Except for the volume resistance value of the power supply roller 16, the configurations of the secondary transfer roller 15 and the power supply roller 16 are the same as those of the first embodiment. The volume resistance value of the secondary transfer roller 15 is the same as that in the first embodiment. In Comparative Example 2, the amount of the ionic conductive agent added is larger than the amount of the ionic conductive agent of Example 2, and the volume resistance value of the power supply roller 16 is made lower than the volume resistance value of Example 2. The inventor evaluated the deterioration of the secondary transfer roller 15 of the comparative example 2 using the same method as the evaluation method of the deterioration of the secondary transfer roller 15 of the first embodiment.

（比較例３）
比較例３では、給電ローラ１６の体積抵抗値を９．０ｌｏｇΩ・ｃｍとした。給電ローラ１６の体積抵抗値を除いて、二次転写ローラ１５及び給電ローラ１６の構成は実施例１の構成と同様である。二次転写ローラ１５の体積抵抗値は実施例１と同様である。比較例３では、添加されるイオン導電剤の量を実施例４のイオン導電剤の量よりも減少し、実施例４の体積抵抗値よりも給電ローラ１６の体積抵抗値を上げている。本発明者は、上述した実施例１の二次転写ローラ１５の劣化の評価方法と同様の方法を用いて、比較例３の二次転写ローラ１５の劣化を評価した。 (Comparative Example 3)
In Comparative Example 3, the volume resistance value of the power supply roller 16 was 9.0 log Ω · cm. Except for the volume resistance value of the power supply roller 16, the configurations of the secondary transfer roller 15 and the power supply roller 16 are the same as those of the first embodiment. The volume resistance value of the secondary transfer roller 15 is the same as that in the first embodiment. In Comparative Example 3, the amount of the ionic conductive agent added is smaller than the amount of the ionic conductive agent of Example 4, and the volume resistance value of the power supply roller 16 is set higher than the volume resistance value of Example 4. The inventor evaluated the deterioration of the secondary transfer roller 15 of Comparative Example 3 using the same method as the evaluation method of the deterioration of the secondary transfer roller 15 of Example 1 described above.

図３は、実施例１〜５及び比較例１〜３の各々に関する二次転写ローラ１５の体積抵抗値、給電ローラ１６の体積抵抗値、体積抵抗値の差分及び二次転写ローラ１５の劣化の関係を示す図である。   FIG. 3 shows the volume resistance value of the secondary transfer roller 15, the volume resistance value of the power supply roller 16, the difference in volume resistance value, and the deterioration of the secondary transfer roller 15 in each of Examples 1 to 5 and Comparative Examples 1 to 3. It is a figure which shows a relationship.

上述したように、二次転写ローラ１５の劣化は、印刷されたハーフトーンの評価画像の濃淡、色むら及び色抜けなどに基づいて評価されている。図３では、印刷されたハーフトーンの評価画像に色むら及び色抜けが無く、且つ当該評価画像の濃度が基準のハーフトーン画像の濃度の９割以上である場合を「◎」で示している。尚、基準のハーフトーン画像の濃度とは、例えば、標準テストチャートを３０万枚印刷する前に印刷されたハーフトーン画像の濃度である。印刷されたハーフトーンの評価画像に色むら及び色抜けが無く、且つ当該評価画像の濃度が基準のハーフトーン画像の濃度の８割以上である場合を「○」で示している。印刷されたハーフトーンの評価画像にむら及び色抜けが無く、且つ当該評価画像の濃度が基準のハーフトーン画像の濃度の８割未満である場合を「△」で示している。印刷されたハーフトーンの評価画像に色むら及び色抜けがある場合を「×」で示している。   As described above, the deterioration of the secondary transfer roller 15 is evaluated based on the density, color unevenness, and color loss of the printed halftone evaluation image. In FIG. 3, a case where the printed halftone evaluation image has no color unevenness and color loss and the density of the evaluation image is 90% or more of the density of the reference halftone image is indicated by “「 ”. . The reference halftone image density is, for example, the density of the halftone image printed before printing 300,000 standard test charts. A case where the printed halftone evaluation image has no color unevenness and color omission and the density of the evaluation image is 80% or more of the density of the reference halftone image is indicated by “◯”. A case where the printed halftone evaluation image has no unevenness and color omission and the density of the evaluation image is less than 80% of the density of the reference halftone image is indicated by “Δ”. A case where the printed halftone evaluation image has color unevenness and color omission is indicated by “x”.

ここで、評価画像の濃度が基準のハーフトーン画像の濃度の８割未満である場合（「△」の場合）や印刷されたハーフトーンの評価画像に色むら及び色抜けがある場合（「×」の場合）には、二次転写ローラ１５の転写能力が落ちており、良好な出力結果が得られないため、二次転写ローラ１５は交換が必要な劣化状態であると判断される。   Here, when the density of the evaluation image is less than 80% of the density of the reference halftone image (in the case of “Δ”), or when the printed halftone evaluation image has color unevenness and color loss (“×” In the case of "", the transfer capability of the secondary transfer roller 15 is low, and a satisfactory output result cannot be obtained. Therefore, it is determined that the secondary transfer roller 15 is in a deteriorated state requiring replacement.

図３の評価結果によれば、二次転写ローラ１５と給電ローラ１６との体積抵抗値の差を１．０ｌｏｇΩ・ｃｍ以下にすると、給電ローラ１６の放電による二次転写ローラ１５の劣化が抑制されることがわかる。二次転写ローラ１５と給電ローラ１６との体積抵抗値の差を０．５ｌｏｇΩ・ｃｍ以下にすると、さらに二次転写ローラ１５の劣化が抑制されることがわかる。   According to the evaluation result of FIG. 3, when the difference in volume resistance between the secondary transfer roller 15 and the power supply roller 16 is 1.0 logΩ · cm or less, the deterioration of the secondary transfer roller 15 due to the discharge of the power supply roller 16 is suppressed. You can see that It can be seen that when the volume resistance difference between the secondary transfer roller 15 and the power supply roller 16 is 0.5 log Ω · cm or less, the deterioration of the secondary transfer roller 15 is further suppressed.

尚、上記実施の形態では、給電ローラ１６が二次転写ローラ１５に当接するように設けられているが、例えば、図４（Ａ）に示すように、給電ローラ１６ａが一次転写ローラ１４に当接するように設けられていてもよい。給電ローラ１６ａ及び一次転写ローラ１４はそれぞれ給電ローラ１６及び二次転写ローラ１５と同様の材料で形成されている。転写バイアス電源１７が、給電ローラ１６と同様に、給電ローラ１６ａに電圧を印加する。この場合、一次転写ローラ１４と給電ローラ１６ａとの体積抵抗値の差を１．０ｌｏｇΩ・ｃｍ以下にすると、給電ローラ１６ａの放電による一次転写ローラ１４の劣化が抑制される。一次転写ローラ１４と給電ローラ１６ａとの体積抵抗値の差を０．５ｌｏｇΩ・ｃｍ以下にすると、さらに一次転写ローラ１４の劣化が抑制される。   In the above embodiment, the power supply roller 16 is provided so as to contact the secondary transfer roller 15, but for example, as shown in FIG. 4A, the power supply roller 16 a contacts the primary transfer roller 14. It may be provided so that it may touch. The power supply roller 16a and the primary transfer roller 14 are formed of the same material as the power supply roller 16 and the secondary transfer roller 15, respectively. The transfer bias power supply 17 applies a voltage to the power supply roller 16 a in the same manner as the power supply roller 16. In this case, if the difference in volume resistance between the primary transfer roller 14 and the power supply roller 16a is 1.0 log Ω · cm or less, deterioration of the primary transfer roller 14 due to the discharge of the power supply roller 16a is suppressed. When the difference in volume resistance between the primary transfer roller 14 and the power supply roller 16a is 0.5 log Ω · cm or less, the deterioration of the primary transfer roller 14 is further suppressed.

また、上記実施の形態では、図１の画像形成装置１は、トナー像を一旦中間転写ベルト２１に転写する中間転写方式の画像形成装置であるが、図４（Ｂ）に示すように、感光体ドラム１０から直接用紙にトナー像を転写する直接転写方式の画像形成装置でもよい。   In the above embodiment, the image forming apparatus 1 in FIG. 1 is an intermediate transfer type image forming apparatus that temporarily transfers the toner image to the intermediate transfer belt 21. As shown in FIG. An image forming apparatus of a direct transfer type that directly transfers a toner image from the body drum 10 to a sheet may be used.

図４（Ｂ）では、画像形成装置１は、図１と同様に、感光体ドラム１０、帯電ローラ１１、露光装置１２、現像器１３及び転写バイアス電源１７を備えている。さらに、画像形成装置１は、トナー像を用紙Ｓに転写し、当該用紙Ｓを矢印Ｂ方向に搬送する転写ローラ２５と、転写ローラ２５に転写電流を供給する給電部材としての給電ローラ１６ｂとを備えている。給電ローラ１６ｂ及び転写ローラ２５はそれぞれ給電ローラ１６及び二次転写ローラ１５と同様の材料で形成されている。この場合、転写ローラ２５と給電ローラ１６ｂとの体積抵抗値の差を１．０ｌｏｇΩ・ｃｍ以下にすると、給電ローラ１６ｂの放電による転写ローラ２５の劣化が抑制される。転写ローラ２５と給電ローラ１６ｂとの体積抵抗値の差を０．５ｌｏｇΩ・ｃｍ以下にすると、さらに転写ローラ２５の劣化が抑制される。   4B, the image forming apparatus 1 includes a photosensitive drum 10, a charging roller 11, an exposure device 12, a developing device 13, and a transfer bias power source 17, as in FIG. Further, the image forming apparatus 1 includes a transfer roller 25 that transfers the toner image to the paper S and conveys the paper S in the direction of arrow B, and a power supply roller 16 b as a power supply member that supplies a transfer current to the transfer roller 25. I have. The power supply roller 16b and the transfer roller 25 are made of the same material as the power supply roller 16 and the secondary transfer roller 15, respectively. In this case, if the difference in volume resistance between the transfer roller 25 and the power supply roller 16b is 1.0 logΩ · cm or less, the deterioration of the transfer roller 25 due to the discharge of the power supply roller 16b is suppressed. When the difference in volume resistance between the transfer roller 25 and the power supply roller 16b is 0.5 log Ω · cm or less, the deterioration of the transfer roller 25 is further suppressed.

なお、本発明は、上述した実施の形態に限定されるものではなく、その要旨を逸脱しない範囲内で種々変形して実施することが可能である。   Note that the present invention is not limited to the above-described embodiment, and can be implemented with various modifications without departing from the scope of the invention.

１ 画像形成装置
１０ 感光体ドラム
１１ 帯電ローラ
１２ 露光装置
１３ 現像器
１４ 一次転写ローラ
１５ 二次転写ローラ
１６、１６ａ、１６ｂ 給電ローラ
１７ 転写バイアス電源
１８ バックアップローラ
２５ 転写ローラ DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10 Photosensitive drum 11 Charging roller 12 Exposure apparatus 13 Developer 14 Primary transfer roller 15 Secondary transfer roller 16, 16a, 16b Feed roller 17 Transfer bias power supply 18 Backup roller 25 Transfer roller

Claims (3)

導電性の芯軸及び当該芯軸に巻装されるイオン導電性の発泡体を有し、トナー像を記録媒体上に転写する転写部材と、
前記転写部材と当接すると共に、前記転写部材に転写電流を供給する給電部材とを備え、
前記転写部材の体積抵抗値と前記給電部材の体積抵抗値との差分が１．０ｌｏｇΩ・ｃｍ以下であることを特徴とする画像形成装置。 A transfer member having a conductive core shaft and an ion conductive foam wound around the core shaft, and transferring a toner image onto a recording medium;
A power supply member that contacts the transfer member and supplies a transfer current to the transfer member;
A difference between a volume resistance value of the transfer member and a volume resistance value of the power supply member is 1.0 log Ω · cm or less. 前記転写部材の体積抵抗値と前記給電部材の体積抵抗値との差分が０．５ｌｏｇΩ・ｃｍ以下であることを特徴とする請求項１に記載の画像形成装置。   The image forming apparatus according to claim 1, wherein a difference between a volume resistance value of the transfer member and a volume resistance value of the power supply member is 0.5 log Ω · cm or less. 前記転写部材の体積抵抗値が、６．０〜８．０ｌｏｇΩ・ｃｍであることを特徴とする請求項１または２に記載の画像形成装置。   The image forming apparatus according to claim 1, wherein a volume resistance value of the transfer member is 6.0 to 8.0 log Ω · cm.
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