JPH1152763A - Image recording device - Google Patents
Image recording deviceInfo
- Publication number
- JPH1152763A JPH1152763A JP20908597A JP20908597A JPH1152763A JP H1152763 A JPH1152763 A JP H1152763A JP 20908597 A JP20908597 A JP 20908597A JP 20908597 A JP20908597 A JP 20908597A JP H1152763 A JPH1152763 A JP H1152763A
- Authority
- JP
- Japan
- Prior art keywords
- secondary transfer
- transfer roller
- roller
- paper
- intermediate transfer
- 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.)
- Withdrawn
Links
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は像記録装置に係り、
特に、電子写真装置等の像記録装置に関する。電子写真
装置等の像記録装置においては、中間転写ローラ上の像
が用紙に転写される転写効率が用紙上に記録された像の
品質を決める重要なファクタである。この転写効率は例
えば像記録装置の環境の温度及び湿度によって影響を受
ける。一般には、環境が高温多湿となると転写効率が低
下する。環境の温度及び湿度が変化しても転写効率が変
化せず常温下での転写効率が維持されるようにすること
が望ましい。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording apparatus,
In particular, it relates to an image recording apparatus such as an electrophotographic apparatus. In an image recording apparatus such as an electrophotographic apparatus, the transfer efficiency at which an image on an intermediate transfer roller is transferred to paper is an important factor that determines the quality of an image recorded on paper. This transfer efficiency is affected by, for example, the temperature and humidity of the environment of the image recording apparatus. Generally, when the environment becomes hot and humid, the transfer efficiency decreases. It is desirable that the transfer efficiency does not change even when the temperature and humidity of the environment change, and that the transfer efficiency at room temperature is maintained.
【０００２】[0002]
【従来の技術】図１２は従来の像記録装置１０を示す。
像記録装置１０は、トナーによる像が形成される感光ド
ラム１１と、感光ドラム１１に形成された像が転写され
る中間転写ローラ１２と、二次転写ローラ１３と、二次
転写ローラ圧接機構１４と、レジストローラ１５と、定
着ローラ１６とを有する。二次転写ローラ１３は、周面
に絶縁膜１３ａを有する構成であり、通常は、中間転写
ローラ１２より離れている。絶縁膜１３ａの抵抗率はＲ
１である。中間転写ローラ１２に像が転写されると、用
紙１８がレジストローラ１５によって送られ、二次転写
ローラ圧接機構１４が動作して二次転写ローラ１３が中
間転写ローラ１２に圧接して用紙１８を中間転写ローラ
１２に押しつける。バイアス電源１７よりの電流は、二
次転写ローラ１３の絶縁膜１３ａ及び用紙１８及び中間
転写ローラ１２の表面の絶縁膜を通して、グランドに流
れる。二次転写ローラ１３は、中間転写ローラ１２の回
転に追随して回転し、用紙１８を中間転写ローラ１２に
押し付け続ける。中間転写ローラ１２上の像が用紙１８
上に転写される。用紙１８が定着ローラ１６を通過し、
用紙１８上の像が用紙１８上に定着されて記録される。FIG. 12 shows a conventional image recording apparatus 10. As shown in FIG.
The image recording apparatus 10 includes a photosensitive drum 11 on which an image formed by toner is formed, an intermediate transfer roller 12 onto which an image formed on the photosensitive drum 11 is transferred, a secondary transfer roller 13, and a secondary transfer roller pressing mechanism 14 , A registration roller 15 and a fixing roller 16. The secondary transfer roller 13 has a configuration having an insulating film 13 a on the peripheral surface, and is usually separated from the intermediate transfer roller 12. The resistivity of the insulating film 13a is R
It is one. When the image is transferred to the intermediate transfer roller 12, the sheet 18 is fed by the registration roller 15, and the secondary transfer roller pressing mechanism 14 operates to cause the secondary transfer roller 13 to press against the intermediate transfer roller 12 to press the sheet 18. It is pressed against the intermediate transfer roller 12. The current from the bias power supply 17 flows to the ground through the insulating film 13a of the secondary transfer roller 13 and the insulating films on the surface of the sheet 18 and the intermediate transfer roller 12. The secondary transfer roller 13 rotates following the rotation of the intermediate transfer roller 12 and keeps pressing the sheet 18 against the intermediate transfer roller 12. The image on the intermediate transfer roller 12 is
Transcribed above. The paper 18 passes through the fixing roller 16,
The image on the paper 18 is fixed on the paper 18 and recorded.
【０００３】別に高温多湿用の二次転写ローラ１３Ａが
用意されている。高温多湿用の二次転写ローラ１３Ａ
は、周面に絶縁膜１３Ａａを有する。絶縁膜１３Ａａの
抵抗値Ｒ２は、上記の二次転写ローラ１３の絶縁膜１３
ａの抵抗値Ｒ１より約１００倍大きい。環境の温度及び
湿度が変化し、高温（３２〜４０℃以上）、多湿（７０
〜８０％以上）となると中間転写ローラ１２上のトナー
の電荷の空気中に逃げる量が増え、トナーの電荷が低下
し、中間転写体ローラ１２上のトナーが用紙１８上に転
写される転写効率が低下し、用紙１８の像は中抜けが発
生することが見受けられるようになり、記録品質が低下
する。[0003] Separately, a secondary transfer roller 13A for high temperature and high humidity is prepared. Secondary transfer roller 13A for high temperature and high humidity
Has an insulating film 13Aa on the peripheral surface. The resistance value R2 of the insulating film 13Aa is equal to the insulating film 13 of the secondary transfer roller 13 described above.
It is about 100 times larger than the resistance value R1 of a. The temperature and humidity of the environment change, and high temperature (32-40 ° C or more) and high humidity (70
(80% or more), the amount of toner charge on the intermediate transfer roller 12 that escapes into the air increases, the charge on the toner decreases, and the transfer efficiency at which the toner on the intermediate transfer roller 12 is transferred onto the paper 18. Is reduced, and it becomes apparent that the image on the sheet 18 has a hollow portion, and the recording quality is degraded.
【０００４】そこで、従来は、環境の温度、湿度が変化
して高温多湿となった場合には、常温用の二次転写ロー
ラ１３を取り外し、高温多湿用の二次転写ローラ１３Ａ
を取り付けていた。高温多湿用の二次転写ローラ１３Ａ
の絶縁膜１３Ａａの体積抵抗率Ｒ２は、上記の二次転写
ローラ１３の絶縁膜１３ａの体積抵抗率Ｒ１より約１０
０倍大きいため、二次転写ローラ１３Ａの絶縁膜１３Ａ
ａの厚さ間の電圧が上昇し、中間転写体ローラ１２上の
トナーの用紙１８上への転写効率が低下しないようにな
り、用紙１８の像は中抜けが発生しなくなり、良好な記
録品質が維持される。Therefore, conventionally, when the temperature and humidity of the environment change to high temperature and high humidity, the secondary transfer roller 13 for normal temperature is removed and the secondary transfer roller 13A for high temperature and high humidity is removed.
Was attached. Secondary transfer roller 13A for high temperature and high humidity
The volume resistivity R2 of the insulating film 13Aa is about 10 times smaller than the volume resistivity R1 of the insulating film 13a of the secondary transfer roller 13 described above.
Because it is 0 times larger, the insulating film 13A of the secondary transfer roller 13A
a, the efficiency of transfer of the toner on the intermediate transfer roller 12 onto the paper 18 does not decrease, the image on the paper 18 does not drop out, and good recording quality is obtained. Is maintained.
【０００５】[0005]
【発明が解決しようとする課題】しかし、常温用の二次
転写ローラ１３を取り外し、その代わりに高温多湿用の
二次転写ローラ１３Ａを取り付けた場合には、二次転写
ローラ１３Ａの振れ回りによって二次転写ローラ１３Ａ
の中間転写体ローラ１２への圧接力が不均一となり易
い。この圧接力の不均一は、用紙の幅方向の転写むらと
なる。そこで、高温多湿用の二次転写ローラ１３Ａを取
り付けた後に、二次転写ローラ１３Ａの中間転写体ロー
ラ１２への圧接力が二次転写ローラ１３Ａの全幅に亘っ
て且つ全周に亘って均一になるように調整する必要があ
り、調整に手間がかかり、作業が面倒となっていた。ま
た、この間は像記録装置１０の運転を停止させる必要が
あり、像記録装置１０の稼働効率も低くなっていた。However, when the secondary transfer roller 13 for normal temperature is removed and the secondary transfer roller 13A for high temperature and high humidity is attached instead, the whirling of the secondary transfer roller 13A causes Secondary transfer roller 13A
Tends to be non-uniform. The non-uniformity of the pressing force causes transfer unevenness in the width direction of the sheet. Then, after attaching the secondary transfer roller 13A for high temperature and humidity, the pressing force of the secondary transfer roller 13A to the intermediate transfer roller 12 is uniform over the entire width of the secondary transfer roller 13A and over the entire circumference. It was necessary to make adjustments so that the adjustment was troublesome and the work was troublesome. During this time, it is necessary to stop the operation of the image recording apparatus 10, and the operation efficiency of the image recording apparatus 10 has been reduced.
【０００６】そこで、本発明は、上記課題を解決した像
記録装置を提供することを目的とする。Therefore, an object of the present invention is to provide an image recording apparatus which has solved the above-mentioned problems.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に、請求項１の発明は、トナー像が形成される像担持体
と、該像担持体に圧接して、該像担持体上のトナー像を
移送される記録媒体に転写する転写部材とを有する像記
録装置において、該転写部材は、転写動作時に回転しな
い構造であり、且つ、物理的特性が互いに異なる複数の
圧接部分を有する構成であり、条件に応じて上記複数の
圧接部分の中から選択された圧接部分が該像担持体に圧
接する構成としたものである。In order to solve the above-mentioned problems, the present invention is directed to an image bearing member on which a toner image is formed, and an image bearing member which is in pressure contact with the image bearing member. An image recording apparatus having a transfer member for transferring a toner image onto a recording medium to be transferred, wherein the transfer member has a structure that does not rotate during a transfer operation and has a plurality of pressure contact portions having different physical characteristics from each other. The pressure contact portion selected from the plurality of pressure contact portions according to the conditions is configured to press against the image carrier.
【０００８】転写部材が転写動作時に回転しない構造
は、条件に応じて物理的特性が互いに異なる複数の圧接
部分の中から選択された圧接部分が像担持体に圧接した
場合に、転写部材の回転中心を調整する等の面倒な調整
作業を不要とするように作用する。請求項２の発明は、
請求項１において、複数の圧接部分は、常温での転写条
件に適した抵抗率を有する常温用圧接部分と、高温多湿
での転写条件に適した抵抗率を有する高温多湿用圧接部
分とよりなる構成としたものである。In the structure in which the transfer member does not rotate during the transfer operation, the transfer member rotates when a press-contact portion selected from a plurality of press-contact portions having different physical characteristics according to conditions is pressed against the image carrier. It works so that troublesome adjustment work such as adjusting the center is not required. The invention of claim 2 is
In claim 1, the plurality of pressure contact portions include a normal temperature pressure contact portion having a resistivity suitable for transfer conditions at normal temperature, and a high temperature / humidity pressure contact portion having a resistivity suitable for transfer conditions at high temperature and high humidity. It is configured.
【０００９】複数の圧接部分を、常温での転写条件に適
した抵抗率を有する常温用圧接部分と、高温多湿での転
写条件に適した抵抗率を有する高温多湿用圧接部分とよ
りなる構成としたことは、環境が高温多湿となった場合
に、高温多湿の下での最適な転写条件への切り換えが素
早く、且つ簡便に行えるように作用する。請求項３の発
明は、請求項１において、複数の圧接部分は、普通紙に
対する転写条件に適した硬度を有する普通紙用圧接部分
と、厚紙に対する転写条件に適した硬度を有する厚紙用
圧接部分とよりなる構成としたものである。A plurality of press-contact portions include a normal-temperature press-contact portion having a resistivity suitable for transfer conditions at room temperature, and a high-temperature and high-humidity press-contact portion having resistivity suitable for transfer conditions at high temperature and high humidity. This means that when the environment becomes hot and humid, switching to the optimum transfer conditions under hot and humid conditions can be performed quickly and easily. According to a third aspect of the present invention, in the first aspect, the plurality of press-contact portions include a press-contact portion for plain paper having hardness suitable for transfer conditions on plain paper and a press-contact portion for thick paper having hardness suitable for transfer conditions on thick paper. And a configuration consisting of:
【００１０】複数の圧接部分を、普通紙に対する転写条
件に適した硬度を有する普通紙用圧接部分と、厚紙に対
する転写条件に適した硬度を有する厚紙用圧接部分とよ
りなる構成としたことは、用紙が普通紙から厚紙に変更
された場合、及びこの逆の場合に、最適な転写条件への
切り換えが素早く、且つ簡便に行われるように作用す
る。[0010] The plurality of press-contact portions are composed of a press-contact portion for plain paper having hardness suitable for transfer conditions on plain paper and a press-contact portion for thick paper having hardness suitable for transfer conditions on thick paper. When the paper is changed from the plain paper to the thick paper, and vice versa, the switching to the optimum transfer condition is performed quickly and easily.
【００１１】[0011]
【発明の実施の形態】図１は本発明の一実施例になる像
記録装置３０を示す。像記録装置３０は、像が露光され
且つトナーによる像が形成される感光ドラム３１と、感
光ドラム３１に像を露光する像露光装置３２と、４色の
トナーを有しており感光ドラム３１の潜像を現像する現
像装置３３と、感光ドラム１１に形成されたカラートナ
ー像が転写される中間転写ローラ３４と、中間転写ロー
ラ３４上のカラートナー像を用紙に転写させる二次転写
装置３５と、用紙３８の搬送方向に順に並んでいる帯電
器４０、レジストローラ４１、除電器４２及び定着ロー
ラ４３とを有する。用紙３８は、帯電器４０によって電
荷が帯電され、レジストローラ１５によって送られ、二
次転写装置３５によって中間転写ローラ３４上のカラー
トナー像が用紙３８に転写され、除電器４２によって電
荷を除かれて中間転写ローラ３４から剥離され易くさ
れ、定着ローラ４３を通過し、用紙４３上のカラートナ
ー像が用紙４３上に定着されて記録される。FIG. 1 shows an image recording apparatus 30 according to an embodiment of the present invention. The image recording device 30 includes a photosensitive drum 31 on which an image is exposed and an image formed by toner, an image exposure device 32 that exposes the photosensitive drum 31 with an image, and a four-color toner A developing device 33 for developing the latent image, an intermediate transfer roller 34 to which the color toner image formed on the photosensitive drum 11 is transferred, and a secondary transfer device 35 to transfer the color toner image on the intermediate transfer roller 34 to paper. , A charger 40, a registration roller 41, a static eliminator 42, and a fixing roller 43 which are sequentially arranged in the transport direction of the paper 38. The paper 38 is charged by the charger 40 and sent by the registration roller 15, the color toner image on the intermediate transfer roller 34 is transferred to the paper 38 by the secondary transfer device 35, and the charge is removed by the charge remover 42. Thus, the color toner image on the sheet 43 is fixed on the sheet 43 and recorded by passing through the fixing roller 43.
【００１２】二次転写装置３５は、図２及び図３に拡大
して示すように、長尺形状の二次転写部材５０と、基台
５１と、基台５１上に固定してあるプランジャソレノイ
ド５２と、基台５１上に移動可能に設けてある移動台５
３と、基台５１をＺ１方向に付勢するばね５４と、プラ
ンジャソレノイド駆動回路５５と、転写バイアス電源５
６を有する。ばね５４は１００ｇ／ｃｍの強さを有す
る。転写バイアス電源５６の電圧は１．０〜３．０ｋＶ
である。The secondary transfer device 35 includes an elongated secondary transfer member 50, a base 51, and a plunger solenoid fixed on the base 51, as shown in FIGS. 52, a moving table 5 movably provided on a base 51
3, a spring 54 for urging the base 51 in the Z1 direction, a plunger solenoid driving circuit 55, and a transfer bias power supply 5
6. The spring 54 has a strength of 100 g / cm. The voltage of the transfer bias power supply 56 is 1.0 to 3.0 kV.
It is.
【００１３】二次転写部材５０は、図３に示すように、
本体６０と、第１の部材６１と、第２の部材６２とを有
する。本体６０は、アルミニウム製であり、断面が正方
形であるロッドであり、上面に、２つの溝６０ａ，６０
ｂがロッドの長手方向に平行い形成してある。第１の部
材６１は、体積抵抗率が１０9 Ωｃｍであり、厚さが５
ｍｍである導電性発泡ウレタンゴム製の部材であり、溝
６０ａに嵌合した状態で、両端側をねじ６３で本体６０
に固定してある。第２の部材６２は、体積抵抗率が１０
11Ωｃｍであり、厚さが５ｍｍである導電性発泡ウレタ
ンゴム製の部材であり、溝５６ａに嵌合した状態で、両
端側をねじ６３で本体５６に固定してある。第２の部材
６２の体積抵抗率は、第１の部材６１の体積抵抗率の約
１００倍と高い。The secondary transfer member 50 is, as shown in FIG.
It has a main body 60, a first member 61, and a second member 62. The main body 60 is a rod made of aluminum and having a square cross section, and has two grooves 60a and 60
b is formed parallel to the longitudinal direction of the rod. The first member 61 has a volume resistivity of 10 9 Ωcm and a thickness of 5
mm, which is a member made of conductive urethane foam, which is fitted in the groove 60a, and whose both ends are screwed to the main body 60.
It is fixed to. The second member 62 has a volume resistivity of 10
A member made of conductive urethane foam having a thickness of 11 Ωcm and a thickness of 5 mm. Both ends are fixed to the main body 56 with screws 63 in a state fitted in the groove 56a. The volume resistivity of the second member 62 is as high as about 100 times the volume resistivity of the first member 61.
【００１４】二次転写装置３５と関連して、像記録装置
３０は、温度センサ７０、湿度センサ７１、及び制御回
路７２を有する。制御回路７２には、温度センサ７０及
び湿度センサ７１よりの情報が供給されており、温度が
３２〜４０℃以上となり、湿度が７０〜８０％以上とな
ると、制御回路７２は制御信号を出力し、プランジャソ
レノイド駆動回路５５を動作させる。In connection with the secondary transfer device 35, the image recording device 30 has a temperature sensor 70, a humidity sensor 71, and a control circuit 72. Information from the temperature sensor 70 and the humidity sensor 71 is supplied to the control circuit 72. When the temperature becomes 32 to 40 ° C. or more and the humidity becomes 70 to 80% or more, the control circuit 72 outputs a control signal. The plunger solenoid drive circuit 55 is operated.
【００１５】中間転写ローラ３４は、ステンレス製の芯
金３４ａの表面に、ＪＩＳＡ硬度が３０度で、厚さが５
ｍｍで、体積抵抗率が１０10Ωｃｍの導電性ＮＢＲゴム
３４ｂが巻きついており、更に、厚さが１００μｍで、
表面抵抗率が１０8 Ω／□のＥＴＦＥ（エチレンテトラ
フルオロエチレン共重合体）フィルム３４ｃが巻きつい
ている構成である。The intermediate transfer roller 34 has a JIS hardness of 30 degrees and a thickness of 5 mm on the surface of a stainless steel core 34a.
mm, a conductive NBR rubber 34b having a volume resistivity of 10 10 Ωcm is wound thereon, and further, the thickness is 100 μm,
In this configuration, an ETFE (ethylene tetrafluoroethylene copolymer) film 34c having a surface resistivity of 10 8 Ω / □ is wound.
【００１６】中間転写ローラ３４が特許請求の範囲の欄
記載の「像担持体」を構成する。二次転写部材５０が特
許請求の範囲の欄記載の「転写部材」を構成する。次
に、上記構成の像記録装置３０の二次転写装置３５の動
作について説明する。感光ドラム３１が感光され、続い
て現像されている間、及び、感光ドラム１１上のカラー
トナー像が中間転写ローラ３４に転写される間は、二次
転写部材５０はプランジャソレノイド５７によって中間
転写ローラ３４から離間している。中間転写ローラ３４
への転写が完了すると、プランジャソレノイド５７がオ
フとなり、図４（Ａ）に示すように、ばね５４によって
基台５１が上動し、二次転写部材５０が中間転写ローラ
３４の真下の部分に圧接し、転写バイアス電源５６が二
次転写部材５０に接続され、中間転写ローラ３４がグラ
ウンドに接続される。中間転写ローラ３４上のカラート
ナー像の用紙３８上への転写が完了すると、プランジャ
ソレノイド５７が作動し、二次転写部材５０が中間転写
ローラ３４から離間し、中間転写ローラ３４に次の転写
がなされるのを待つ。中間転写ローラ３４へ転写が行わ
れると、プランジャソレノイド５７が再度オフとなり、
二次転写部材５０が中間転写ローラ３４の真下の部分に
圧接し、次に送り込まれた用紙に転写及び記録が行われ
る。The intermediate transfer roller 34 constitutes an "image carrier" described in the claims. The secondary transfer member 50 constitutes a “transfer member” described in the claims. Next, the operation of the secondary transfer device 35 of the image recording device 30 having the above configuration will be described. While the photosensitive drum 31 is exposed and subsequently developed, and while the color toner image on the photosensitive drum 11 is transferred to the intermediate transfer roller 34, the secondary transfer member 50 is moved by the plunger solenoid 57 to the intermediate transfer roller. 34. Intermediate transfer roller 34
When the transfer to the intermediate transfer roller 34 is completed, the plunger solenoid 57 is turned off, and the base 51 is moved upward by the spring 54, as shown in FIG. When pressed, the transfer bias power supply 56 is connected to the secondary transfer member 50, and the intermediate transfer roller 34 is connected to ground. When the transfer of the color toner image on the intermediate transfer roller 34 onto the paper 38 is completed, the plunger solenoid 57 is operated, the secondary transfer member 50 is separated from the intermediate transfer roller 34, and the next transfer is performed on the intermediate transfer roller 34. Wait for it to be done. When the transfer to the intermediate transfer roller 34 is performed, the plunger solenoid 57 is turned off again,
The secondary transfer member 50 comes into pressure contact with a portion immediately below the intermediate transfer roller 34, and transfer and recording are performed on the next fed sheet.
【００１７】環境が常温、常湿である場合には、プラン
ジャソレノイド５２はオフであり、移動台５３はＸ１方
向に移動しており、二次転写部材５０のうち第１の部材
６１が中間転写ローラ３４の真下の位置に対向してい
る。中間転写ローラ３４への転写が完了してプランジャ
ソレノイド５７がオフとなると、図４（Ａ）に示すよう
に、二次転写部材５０のうち第１の部材６１が中間転写
ローラ３４の真下の部分に圧接する。When the environment is normal temperature and normal humidity, the plunger solenoid 52 is off, the movable table 53 is moving in the X1 direction, and the first member 61 of the secondary transfer member 50 is in the intermediate transfer state. It faces a position directly below the roller 34. When the transfer to the intermediate transfer roller 34 is completed and the plunger solenoid 57 is turned off, as shown in FIG. 4A, the first member 61 of the secondary transfer member 50 is moved to a portion directly below the intermediate transfer roller 34. Press against
【００１８】帯電器４０によって帯電され、レジストロ
ーラ４１によってＸ２方向に中間転写ローラ３４の周速
と同じ速度で送られた用紙３８は、中間転写ローラ３４
とこれに圧接している二次転写部材５０との間に入り込
み、中間転写ローラ３４とこれに圧接している二次転写
部材５０との間を通る。用紙３８は、中間転写ローラ３
４との間では滑らずに、二次転写部材５０の第１の部材
６１に対しては滑って移動する。このとき、転写バイア
ス電源５６よりの電流が、二次転写部材５０のうち第１
の部材６１、用紙３８、中間転写ローラ３４の表面のＥ
ＴＦＥフィルム３４ｃ及び導電性ＮＢＲゴム３４ｂを通
ってアースに流れる。第１の部材６１の厚さ方向両端間
に発生する高い電圧Ｖ１によって、中間転写ローラ３４
上のカラートナー像が用紙３８上に８０〜９０％の高い
転写効率で転写される。The paper 38 charged by the charger 40 and sent by the registration roller 41 in the X2 direction at the same speed as the peripheral speed of the intermediate transfer roller 34 is
And between the intermediate transfer roller 34 and the secondary transfer member 50 pressed against the intermediate transfer roller 34. The paper 38 is the intermediate transfer roller 3
4, does not slip and moves with respect to the first member 61 of the secondary transfer member 50. At this time, the current from the transfer bias power supply 56 is the first of the secondary transfer members 50.
Of the member 61, the paper 38, and the surface of the intermediate transfer roller 34
It flows to the ground through the TFE film 34c and the conductive NBR rubber 34b. The high voltage V1 generated between both ends in the thickness direction of the first member 61 causes the intermediate transfer roller 34
The upper color toner image is transferred onto the paper 38 with a high transfer efficiency of 80 to 90%.
【００１９】像記録装置３０は数日間継続して稼働され
る場合がある。像記録装置３０の稼働中に、環境の温
度、湿度が上昇し、温度が３２〜４０℃以上となり、湿
度が７０〜８０％以上となると、制御回路７２は制御信
号を出力し、二次転写部材５０が中間転写ローラ３４か
ら離間している間に、プランジャソレノイド駆動回路５
５が動作し、プランジャソレノイド５２が励磁され、図
４（Ｂ）に示すように、移動台５３がＸ２方向に所定距
離移動され、第１の部材６１に代えて、第２の部材６２
が中間転写ローラ３４の真下に対向する。中間転写ロー
ラ３４への転写が完了すると、ばね５４によって基台５
１が上動し、二次転写部材５０のうち第２の部材６２が
中間転写ローラ３４に圧接する。The image recording device 30 may be operated continuously for several days. During operation of the image recording apparatus 30, when the temperature and humidity of the environment rise and the temperature becomes 32 to 40 ° C. or more and the humidity becomes 70 to 80% or more, the control circuit 72 outputs a control signal to perform secondary transfer. While the member 50 is separated from the intermediate transfer roller 34, the plunger solenoid driving circuit 5
5 operates, the plunger solenoid 52 is excited, and as shown in FIG. 4B, the movable table 53 is moved by a predetermined distance in the X2 direction, and the second member 62 is replaced with the second member 62.
Faces directly below the intermediate transfer roller 34. When the transfer to the intermediate transfer roller 34 is completed, the base 5 is
1 moves upward, and the second member 62 of the secondary transfer member 50 is pressed against the intermediate transfer roller 34.
【００２０】転写バイアス電源５６よりの電流は、二次
転写部材５０のうち第２の部材６２、用紙３８、中間転
写ローラ３４の表面のＥＴＦＥフィルム３４ｃ及び導電
性ＮＢＲゴム３４ｂを通ってアースに流れる。第２の部
材６２の体積抵抗率は、第１の部材６１の体積抵抗率の
約１００倍と高いため、第２の部材６１の厚さ方向両端
間には、第１の部材６１に発生していた電圧Ｖ１より約
１００倍も高い電圧Ｖ２が発生する。このため、環境が
高温多湿となって中間転写ローラ３４上のトナーの電荷
が低下しても、中間転写体ローラ３４上のトナーは依然
として用紙３８上に効率良く転写され、中間転写ローラ
３４上のカラートナー像の用紙３８上への転写効率は８
０〜９０％という高い状態に維持される。これによっ
て、用紙３８には良質の像が記録され続ける。The current from the transfer bias power supply 56 flows to the ground through the second member 62 of the secondary transfer member 50, the paper 38, the ETFE film 34c on the surface of the intermediate transfer roller 34, and the conductive NBR rubber 34b. . Since the volume resistivity of the second member 62 is as high as about 100 times the volume resistivity of the first member 61, the first member 61 is formed between both ends in the thickness direction of the second member 61. A voltage V2 that is approximately 100 times higher than the voltage V1 is generated. Therefore, even if the environment becomes hot and humid and the charge of the toner on the intermediate transfer roller 34 decreases, the toner on the intermediate transfer roller 34 is still efficiently transferred onto the paper 38 and the toner on the intermediate transfer roller 34 The transfer efficiency of the color toner image onto the paper 38 is 8
It is maintained at a high state of 0-90%. As a result, a high quality image is continuously recorded on the paper 38.
【００２１】用紙３８は、中間転写ローラ３４との間で
は滑らずに、二次転写部材５０の第２の部材６２に対し
ては滑って移動する。第１の部材６１の上面６１ａ及び
第２の部材６２の上面６２ａの粗さは、中心線平均粗さ
Ｒａで１．６以下にしてある。よって、用紙３８と第１
の部材６１の上面６１ａとの摩擦力及び用紙３８と第２
の部材６２の上面６２ａとの摩擦力は低く抑えられてお
り、二次転写部材５０が回転しなくても、用紙３８は円
滑に搬送される。よって、滑りつつ移動する用紙３８か
らのちりの発生は抑えられ、且つ、用紙３８上に転写さ
れた像がぼけることも抑えられる。The paper 38 does not slide between the intermediate transfer roller 34 but slides with respect to the second member 62 of the secondary transfer member 50. The roughness of the upper surface 61a of the first member 61 and the upper surface 62a of the second member 62 is 1.6 or less in center line average roughness Ra. Therefore, the paper 38 and the first
Friction between the upper surface 61a of the member 61 and the paper 38 and the second
The frictional force of the member 62 with the upper surface 62a is kept low, so that the paper 38 can be smoothly transported even if the secondary transfer member 50 does not rotate. Therefore, generation of dust from the paper 38 that moves while sliding is suppressed, and blurring of the image transferred on the paper 38 is also suppressed.
【００２２】環境の温度、湿度が上昇した場合の第１の
部材６１から第２の部材６２への切り換えは、移動台５
３が基台５１上をＸ２方向に所定距離移動して、二次転
写部材５０がＸ２方向に短い距離Ｌ１の直線移動だけで
行われ、且つ、二次転写部材５０が回転せずに固定であ
る構成であるため、切り換えられた第２の部材６２の中
間転写ローラ３４への圧接力は、調整しなくても全長に
亘って等しい状態となり、切り換え後の調整作業は必要
でない。よって、環境の温度、湿度が上昇した場合の切
り換えは簡便に且つ印刷作業を中止することなく行われ
る。また、環境の温度、湿度が上昇した場合の切り換え
は自動的に行われるため、手動で切り換える場合に比べ
て面倒がない。The switching from the first member 61 to the second member 62 when the temperature and humidity of the environment rises is performed by moving the moving table 5.
3 moves on the base 51 in the X2 direction by a predetermined distance, the secondary transfer member 50 is moved only by a linear movement of a short distance L1 in the X2 direction, and the secondary transfer member 50 is fixed without rotating. Because of this configuration, the pressed force of the switched second member 62 against the intermediate transfer roller 34 remains the same over the entire length without adjustment, and no adjustment work after switching is necessary. Therefore, switching when the temperature and humidity of the environment are increased can be performed easily and without stopping the printing operation. In addition, since the switching when the temperature and humidity of the environment increase is performed automatically, there is no trouble compared to the case where the switching is performed manually.
【００２３】また、環境の温度、湿度が低下して通常の
状態となると、プランジャソレノイド５２がオフとな
り、元の第１の部材６１が中間転写ローラ３４に圧接す
るようになる。また、第１の部材６１及び第２の部材６
２が摩耗し又は静電破壊して中間転写ローラ上のカラー
トナー像の用紙上への転写効率が低下したときには、第
１の部材６１及び第２の部材６２だけを交換すれば足
り、簡便であり、且つ経済的である。When the temperature and humidity of the environment decrease to a normal state, the plunger solenoid 52 is turned off, and the original first member 61 comes into pressure contact with the intermediate transfer roller 34. In addition, the first member 61 and the second member 6
When the transfer efficiency of the color toner image on the intermediate transfer roller onto the paper is lowered due to wear or electrostatic breakdown of the intermediate transfer roller 2, it is sufficient to replace only the first member 61 and the second member 62, which is simple and convenient. Yes and economical.
【００２４】なお、環境の温度、湿度が上昇した場合の
切り換えを手動で行うようにしてもよい。次に、二次転
写装置の変形例について説明する。各図中、図１乃至図
４に示す構成部分と同一部分には同一符号を付す。図５
は、第１の変形例になる二次転写装置３５Ａを示す。Incidentally, the switching when the temperature and humidity of the environment rise may be performed manually. Next, a modified example of the secondary transfer device will be described. In the drawings, the same components as those shown in FIGS. 1 to 4 are denoted by the same reference numerals. FIG.
Indicates a secondary transfer device 35A according to a first modification.
【００２５】二次転写装置３５Ａは、二次転写部材５０
Ａを有する。本体６０Ａは、その上面が、点Ｏを中心と
する半径Ｒが１５ｍｍの円弧の面６０Ａｃである。第１
の部材６１Ａと第２の部材６２Ａとが、円弧の面６０Ａ
ｃに露出して、本体６０Ａに固定してある。第１の部材
６１Ａ及び第２の部材６２Ａの上面６１Ａａ，６２Ａａ
は、上記円弧の面６０Ａｃと同じ曲率の上に凸の円弧の
面であり、上記の円弧の面６０Ａｃの一部を形成してい
る。二次転写部材５０Ａは、上記の点Ｏの個所を、基台
５１上の軸８０に回動可能に支持されている。二次転写
部材５０Ａの下側の腕５０Ａｄに、プランジャソレノイ
ド５２が接続されている。The secondary transfer device 35A includes a secondary transfer member 50
A. The upper surface of the main body 60A is an arc-shaped surface 60Ac having a radius R of 15 mm centered on the point O. First
61A and the second member 62A form an arc surface 60A.
and is fixed to the main body 60A. Upper surfaces 61Aa, 62Aa of first member 61A and second member 62A
Is a surface of a circular arc convex above the same curvature as the surface 60Ac of the circular arc, and forms a part of the surface 60Ac of the circular arc. The secondary transfer member 50 </ b> A is rotatably supported at the point O on a shaft 80 on the base 51. A plunger solenoid 52 is connected to the lower arm 50Ad of the secondary transfer member 50A.
【００２６】図６（Ａ）は環境が常温の場合を示す。プ
ランジャソレノイド５２が作動しており、二次転写部材
５０Ａは時計方向に回動されており、第１の部材６１Ａ
が中間転写ローラ３４に圧接している。図６（Ｂ）は環
境が高温多湿の場合を示す。プランジャソレノイド５２
がオフとなっており、二次転写部材５０Ｂは反時計方向
に回動されており、第２の部材６２Ａが中間転写ローラ
３４に圧接している。FIG. 6A shows a case where the environment is at room temperature. The plunger solenoid 52 is operated, the secondary transfer member 50A is rotated clockwise, and the first member 61A
Are in pressure contact with the intermediate transfer roller 34. FIG. 6B shows a case where the environment is hot and humid. Plunger solenoid 52
Is off, the secondary transfer member 50B is rotated counterclockwise, and the second member 62A is in pressure contact with the intermediate transfer roller 34.
【００２７】ここで、第１の部材６１Ａ及び第２の部材
６２Ａの上面６１Ａａ，６２Ａａは、円弧の面であるた
め、上面６１Ａａ，６２Ａａが平面である場合に比べ
て、用紙３８と中間転写ローラ３４との密着性が向上
し、中間転写ローラ上のカラートナー像の用紙上への転
写効率が向上する。本発明者は、実験の結果、中間転写
ローラ上のカラートナー像の用紙上への転写効率が９３
％であることを確認した。転写効率は、前記の第１の部
材６１及び第２の部材６２のように上面が平面である場
合の転写効率８５％より向上している。Here, since the upper surfaces 61Aa and 62Aa of the first member 61A and the second member 62A are arc-shaped surfaces, the paper 38 and the intermediate transfer roller are compared with the case where the upper surfaces 61Aa and 62Aa are flat. Thus, the transfer efficiency of the color toner image on the intermediate transfer roller onto the paper is improved. As a result of the experiment, the present inventor found that the transfer efficiency of the color toner image on the intermediate transfer roller onto the paper was 93%.
%. The transfer efficiency is higher than the transfer efficiency of 85% when the upper surface is flat like the first member 61 and the second member 62.
【００２８】図７は、第２の変形例になる二次転写装置
３５Ｂを示す。二次転写装置３５Ｂは、上記の二次転写
装置３５Ａを更に改善したものである。二次転写装置３
５Ｂは、二次転写部材５０Ｂを有する。本体６０Ｂは、
第１の部材６１Ａ及び第２の部材６２Ａに加えて、第３
の部材９０を有する。第３の部材９０は、体積抵抗率が
１０8 Ωｃｍであり、厚さが５ｍｍである導電性発泡ウ
レタンゴム製の部材である。プランジャソレノイド５２
Ｂは三位置保持型である。FIG. 7 shows a secondary transfer device 35B according to a second modification. The secondary transfer device 35B is a further improvement of the above-described secondary transfer device 35A. Secondary transfer device 3
5B has a secondary transfer member 50B. The main body 60B
In addition to the first member 61A and the second member 62A, the third member
Member 90. The third member 90 is a member made of conductive urethane foam rubber having a volume resistivity of 10 8 Ωcm and a thickness of 5 mm. Plunger solenoid 52
B is a three-position holding type.
【００２９】図８（Ａ）は環境が常温の場合を示す。プ
ランジャソレノイド５２Ｂが中央の位置にあり、二次転
写部材５０Ａは中央の位置に有り、第１の部材６１Ａが
中間転写ローラ３４に圧接している。図８（Ｂ）は環境
が高温多湿の場合を示す。プランジャソレノイド５２Ｂ
が突き出ており、二次転写部材５０Ｂは反時計方向に回
動されており、第２の部材６２Ａが中間転写ローラ３４
に圧接している。図８（Ｃ）は環境が低温低湿度の場合
を示す。プランジャソレノイド５２Ａが引き込まれてお
り、二次転写部材５０Ｂは時計方向に回動されており、
第３の部材９０が中間転写ローラ３４に圧接している。FIG. 8A shows a case where the environment is at room temperature. The plunger solenoid 52B is at the center position, the secondary transfer member 50A is at the center position, and the first member 61A is in pressure contact with the intermediate transfer roller 34. FIG. 8B shows a case where the environment is hot and humid. Plunger solenoid 52B
Are projected, the secondary transfer member 50B is rotated counterclockwise, and the second member 62A is
Is pressed against. FIG. 8C shows a case where the environment is low temperature and low humidity. The plunger solenoid 52A is retracted, the secondary transfer member 50B is rotated clockwise,
The third member 90 is in pressure contact with the intermediate transfer roller 34.
【００３０】上記の二次転写装置３５Ｂによれば、常温
時における中間転写ローラ３４上のカラートナー像の用
紙３８上への転写効率が、高温多湿時の場合にも、低温
低湿度の場合にも維持される。図９は、第３の変形例に
なる二次転写装置３５Ｃを示す。二次転写装置３５Ｃ
は、図７の二次転写装置３５Ｂを更に改善したものであ
る。二次転写装置３５Ｃは、二次転写部材５０Ｃを有す
る。二次転写部材５０Ｃは円柱形状であり、基台５１上
の軸１００に回動可能に、且つ、所定位置にロックされ
るように設けてある。円柱形状の本体６０Ｃの周面に、
第１の部材６１Ａ−１、第２の部材６２Ａ−１、第３の
部材９０−１が、図７の二次転写装置３５Ｂの場合と同
じ配置で設けてあり、且つ、第１の部材６１Ａ−２、第
２の部材６２Ａ−２、第３の部材９０−２が軸１００に
関して上記の第１の部材６１Ａ−１、第２の部材６２Ａ
−１、第３の部材９０−１と点対称の位置に設けてあ
る。二次転写部材５０Ｃは、モータ１０１によって所定
角度回動され、モータ１０１が停止するとその位置にロ
ックされる。According to the secondary transfer device 35B, the transfer efficiency of the color toner image on the intermediate transfer roller 34 onto the paper 38 at normal temperature can be improved even when the temperature is high and humid, and when the temperature is low and low humidity. Is also maintained. FIG. 9 shows a secondary transfer device 35C according to a third modification. Secondary transfer device 35C
Is a further improvement of the secondary transfer device 35B of FIG. The secondary transfer device 35C has a secondary transfer member 50C. The secondary transfer member 50C has a cylindrical shape, and is provided so as to be rotatable about a shaft 100 on the base 51 and to be locked at a predetermined position. On the peripheral surface of the cylindrical main body 60C,
The first member 61A-1, the second member 62A-1, and the third member 90-1 are provided in the same arrangement as in the case of the secondary transfer device 35B in FIG. 7, and the first member 61A is provided. -2, the second member 62A-2, and the third member 90-2 are the first member 61A-1 and the second member 62A described above with respect to the shaft 100.
-1, is provided at a point symmetrical position with respect to the third member 90-1. The secondary transfer member 50C is rotated by a predetermined angle by the motor 101, and is locked at that position when the motor 101 stops.
【００３１】環境が常温の場合には、二次転写部材５０
Ｃは図９に示す回動位置（第１の部材６１Ａ−１が真上
に位置している）にあり、第１の部材６１Ａ−１が中間
転写ローラに圧接する。高温多湿時の場合には、二次転
写部材５０Ｃは図９に示す回動位置より反時計方向に角
度θ１回動した状態とされ、第２の部材６２Ａ−１が中
間転写ローラに圧接する。低温低湿度の場合には、二次
転写部材５０Ｃは図９に示す回動位置より時計方向に角
度θ１回動した状態とされ、第３の部材９０−１が中間
転写ローラに圧接する。When the environment is at room temperature, the secondary transfer member 50
C is at the rotation position shown in FIG. 9 (the first member 61A-1 is located directly above), and the first member 61A-1 is pressed against the intermediate transfer roller. In the case of high temperature and high humidity, the secondary transfer member 50C is turned counterclockwise by an angle θ1 from the turning position shown in FIG. 9, and the second member 62A-1 is pressed against the intermediate transfer roller. In the case of low temperature and low humidity, the secondary transfer member 50C is turned clockwise by an angle θ1 from the turning position shown in FIG. 9, and the third member 90-1 is pressed against the intermediate transfer roller.
【００３２】第１の部材６１Ａ−１、第２の部材６２Ａ
−１及び第３の部材９０−１が傷んだ場合には、二次転
写部材５０Ｃは、モータ１０１によって１８０度回動さ
れ、第１の部材６１Ａ−２、第２の部材６２Ａ−２及び
第３の部材９０−２が中間転写ローラに圧接するように
される。この状態で、即ち、像記録装置を停止させない
で、傷んでいる第１の部材６１Ａ−１、第２の部材６２
Ａ−１及び第３の部材９０−１が交換される。The first member 61A-1 and the second member 62A
When the -1 and third members 90-1 are damaged, the secondary transfer member 50C is rotated by 180 degrees by the motor 101, and the first member 61A-2, the second member 62A-2, and the The third member 90-2 is pressed against the intermediate transfer roller. In this state, that is, without stopping the image recording apparatus, the damaged first member 61A-1 and the second member 62
A-1 and the third member 90-1 are exchanged.
【００３３】図１０は、第４の変形例になる二次転写装
置３５Ｄを示す。二次転写装置３５Ｄは、図５の二次転
写装置３５Ｂの変形例的なものである。二次転写部材５
０Ｄは、本体６０Ｄに、第１の部材６１Ａに代わる第１
の導電性フッ素加工面部１１１と、第２の部材６２Ａに
代わる第２の導電性フッ素加工面部１１２とを有する構
成である。第１の導電性フッ素加工面部１１１の表面抵
抗率は１０8 Ω／□であり、第２の導電性フッ素加工面
部１１２の表面抵抗率は１０10Ω／□である。FIG. 10 shows a secondary transfer device 35D according to a fourth modification. The secondary transfer device 35D is a modification of the secondary transfer device 35B of FIG. Secondary transfer member 5
0D is a first member that replaces the first member 61A in the main body 60D.
And a second conductive fluorine processing surface portion 112 in place of the second member 62A. The surface resistivity of the first conductive fluorine processed surface 111 is 10 8 Ω / □, and the surface resistivity of the second conductive fluorine processed surface 112 is 10 10 Ω / □.
【００３４】環境が常温の場合には、プランジャソレノ
イド５２によって二次転写部材５０Ｄは時計方向に回動
しており、第１の導電性フッ素加工面部１１１が中間転
写ローラに圧接する。高温多湿時の場合には、プランジ
ャソレノイド５２によって二次転写部材５０Ｄは反時計
方向に回動しており、第２の導電性フッ素加工面部１１
２が中間転写ローラに圧接する。よって、常温時におけ
る中間転写ローラ上のカラートナー像の用紙上への転写
効率が、高温多湿時の場合にも維持される。When the environment is at normal temperature, the secondary transfer member 50D is rotated clockwise by the plunger solenoid 52, and the first conductive fluorine processing surface portion 111 is pressed against the intermediate transfer roller. In the case of high temperature and high humidity, the secondary transfer member 50D is rotated counterclockwise by the plunger solenoid 52, and the second conductive fluorine processing surface portion 11 is rotated.
2 comes into pressure contact with the intermediate transfer roller. Therefore, the transfer efficiency of the color toner image on the intermediate transfer roller onto the sheet at normal temperature is maintained even at high temperature and high humidity.
【００３５】なお、第１の導電性フッ素加工面部１１１
及び第２の導電性フッ素加工面部１１２の用紙との摩擦
係数は小さく、用紙はより円滑に搬送される。よって、
滑りつつ移動する用紙からのちりの発生は抑えられ、且
つ、用紙上に転写された像がぼけることも抑えられる。
図１１は、第５の変形例になる二次転写装置３５Ｅを示
す。The first conductive fluorine processing surface portion 111
Also, the coefficient of friction between the second conductive fluorine processing surface portion 112 and the paper is small, and the paper is transported more smoothly. Therefore,
The generation of dust from the paper moving while slipping is suppressed, and the blurring of the image transferred on the paper is also suppressed.
FIG. 11 shows a secondary transfer device 35E according to a fifth modification.
【００３６】二次転写装置３５Ｅは、二次転写部材５０
Ｅを有する。本体６０Ｅに、第１の導電性フッ素加工面
部１１１の表面と、第２の部材６２Ｅが設けてある。第
１の導電性フッ素加工面部１１１の表面抵抗率は１０8
Ω／□である。第２の部材６２Ｅは前記の第２の部材６
２Ａ（厚さが５ｍｍである導電性発泡ウレタンゴム）の
表面にライニング加工したものであり、体積抵抗率が１
０11Ωｃｍであり、硬度は第１の導電性フッ素加工面部
１１１より低い。The secondary transfer device 35E includes a secondary transfer member 50
E. The main body 60E is provided with the surface of the first conductive fluorine processing surface portion 111 and the second member 62E. The surface resistivity of the first conductive fluorine processing surface portion 111 is 10 8
Ω / □. The second member 62E is the second member 6 described above.
2A (conductive urethane foam having a thickness of 5 mm) lined on the surface and having a volume resistivity of 1
0 11 Ωcm, and the hardness is lower than that of the first conductive fluorine processing surface portion 111.
【００３７】環境が常温の場合には、プランジャソレノ
イド５２によって二次転写部材５０Ｅは時計方向に回動
しており、第１の導電性フッ素加工面部１１１が中間転
写ローラに圧接する。高温多湿時の場合には、プランジ
ャソレノイド５２によって二次転写部材５０Ｅは反時計
方向に回動しており、第２の部材６２Ｅが中間転写ロー
ラに圧接する。よって、常温時における中間転写ローラ
上のカラートナー像の用紙上への転写効率が、高温多湿
時の場合にも維持される。When the environment is at normal temperature, the secondary transfer member 50E is rotated clockwise by the plunger solenoid 52, and the first conductive fluorine processing surface portion 111 is pressed against the intermediate transfer roller. In the case of high temperature and high humidity, the secondary transfer member 50E is rotated counterclockwise by the plunger solenoid 52, and the second member 62E is pressed against the intermediate transfer roller. Therefore, the transfer efficiency of the color toner image on the intermediate transfer roller onto the sheet at normal temperature is maintained even at high temperature and high humidity.
【００３８】なお、普通紙を使用する場合には、第１の
導電性フッ素加工面部１１１が中間転写ローラに圧接
し、厚紙を使用する場合には、二次転写部材５０Ｅが中
間転写ローラに圧接するようにされる。これによって、
厚紙についても、普通紙を使用する場合と同程度の効率
で転写が行われる。また、本発明は、中間転写ローラ３
４を有していず、二次転写部材５０が感光ドラム３１
（最初にトナー像が形成されるもの）に直接圧接する構
成のものにも適用可能である。但し、最初にトナー像が
形成されるものは、転写部材が圧接しても表面に傷が生
じない構成となっていることが条件とされる。When plain paper is used, the first conductive fluorine-processed surface portion 111 is pressed against the intermediate transfer roller, and when thick paper is used, the secondary transfer member 50E is pressed against the intermediate transfer roller. To be. by this,
For thick paper, transfer is performed with approximately the same efficiency as when plain paper is used. The present invention also relates to the intermediate transfer roller 3
And the secondary transfer member 50 is not provided with the photosensitive drum 31
The present invention is also applicable to a configuration in which the toner image is directly pressed against (the first toner image is formed). However, a condition in which the toner image is formed first is such that the surface is not damaged even when the transfer member is pressed.
【００３９】また、圧接部分毎に変えている物理的特性
としては、抵抗率、硬度の他に、摩擦係数等が考えられ
る。The physical properties changed for each press-contact portion include a coefficient of friction and the like in addition to the resistivity and the hardness.
【００４０】[0040]
【発明の効果】以上説明したように、請求項１の発明
は、転写部材が転写動作時に回転しない構造であるた
め、条件に応じて物理的特性が互いに異なる複数の圧接
部分の中から選択された圧接部分が像担持体に圧接した
場合に、転写部材の回転中心を調整する等の面倒な調整
作業を不要とし得、よって、温度湿度等の環境の条件が
変化した場合又は普通紙厚紙等の記録媒体の種類が変化
した場合に最適な転写条件への切り換えを素早く、且つ
簡便に行うことが出来る。As described above, according to the first aspect of the present invention, since the transfer member does not rotate during the transfer operation, the transfer member is selected from a plurality of press contact portions having different physical characteristics depending on conditions. When the pressure contact portion is pressed against the image carrier, troublesome adjustment work such as adjusting the rotation center of the transfer member may be unnecessary, and thus, when environmental conditions such as temperature and humidity change, or when plain paper When the type of recording medium changes, the switching to the optimal transfer condition can be performed quickly and easily.
【００４１】請求項２の発明は、複数の圧接部分は、常
温での転写条件に適した抵抗率を有する常温用圧接部分
と、高温多湿での転写条件に適した抵抗率を有する高温
多湿用圧接部分とよりなる構成としたため、環境が高温
多湿となった場合に、高温多湿の下での最適な転写条件
への切り換えを素早く、且つ簡便に行うことが出来る。According to a second aspect of the present invention, the plurality of pressure contact portions include a normal temperature pressure contact portion having a resistivity suitable for transfer conditions at normal temperature, and a high temperature and humidity contact portion having a resistivity suitable for transfer conditions at high temperature and humidity. Because of the configuration including the pressure contact portion, when the environment becomes hot and humid, switching to the optimum transfer condition under hot and humid can be performed quickly and easily.
【００４２】請求項３の発明は、複数の圧接部分は、普
通紙に対する転写条件に適した硬度を有する普通紙用圧
接部分と、厚紙に対する転写条件に適した硬度を有する
厚紙用圧接部分とよりなる構成としたため、用紙が普通
紙から厚紙に変更された場合、及びこの逆の場合に、最
適な転写条件への切り換えを素早く、且つ簡便に行うこ
とが出来る。According to a third aspect of the present invention, the plurality of press-contact portions include a press-contact portion for plain paper having hardness suitable for transfer conditions on plain paper, and a press-contact portion for thick paper having hardness suitable for transfer conditions on thick paper. Therefore, when the paper is changed from plain paper to thick paper and vice versa, switching to the optimum transfer condition can be performed quickly and easily.
【図１】本発明の一実施例になる像記録装置を示す図で
ある。FIG. 1 is a diagram illustrating an image recording apparatus according to an embodiment of the present invention.
【図２】図１中、二次転写装置を拡大して示す図であ
る。FIG. 2 is an enlarged view showing a secondary transfer device in FIG. 1;
【図３】二次転写部材の構造を示す図である。FIG. 3 is a diagram illustrating a structure of a secondary transfer member.
【図４】二次転写装置の動作を説明する図である。FIG. 4 is a diagram illustrating the operation of the secondary transfer device.
【図５】第１の変形例になる二次転写装置を示す図であ
る。FIG. 5 is a diagram illustrating a secondary transfer device according to a first modified example.
【図６】図５の二次転写装置の動作を説明する図であ
る。FIG. 6 is a diagram illustrating the operation of the secondary transfer device of FIG.
【図７】第２の変形例になる二次転写装置を示す図であ
る。FIG. 7 is a diagram illustrating a secondary transfer device according to a second modification.
【図８】図７の二次転写装置の動作を説明する図であ
る。FIG. 8 is a diagram illustrating the operation of the secondary transfer device of FIG.
【図９】第３の変形例になる二次転写装置を示す図であ
る。FIG. 9 is a diagram illustrating a secondary transfer device according to a third modification.
【図１０】第４の変形例になる二次転写装置を示す図で
ある。FIG. 10 is a diagram illustrating a secondary transfer device according to a fourth modification.
【図１１】第５の変形例になる二次転写装置を示す図で
ある。FIG. 11 is a diagram illustrating a secondary transfer device according to a fifth modified example.
【図１２】従来の像記録装置を示す図である。FIG. 12 is a diagram illustrating a conventional image recording apparatus.
３０ 像記録装置 ３１ 感光ドラム ３２ 像露光装置 ３３ 現像装置 ３４ 中間転写ローラ ３５，３５Ａ〜３５Ｅ 二次転写装置 ４３ 定着ローラ ５０，５０Ａ〜５０Ｅ 二次転写部材 ５１ 基台 ５２ プランジャソレノイド ５４ ばね ５５ プランジャソレノイド駆動回路 ５６ 転写バイアス電源 ６０，６０Ａ〜６０Ｅ 本体 ６１，６１Ａ，６１Ａ−１，６１Ａ−２ 第１の部材 ６２，６２Ａ，６２Ａ−１，６２Ａ−２ 第２の部材 ６３ ねじ ７０ 温度センサ ７１ 湿度センサ ７２ 制御回路 ９０，９０−１，９０−２ 第３の部材 １０１ モータ １１１ 第１の導電性フッ素加工面部 １１２ 第２の導電性フッ素加工面部 Reference Signs List 30 image recording device 31 photosensitive drum 32 image exposure device 33 developing device 34 intermediate transfer roller 35, 35A to 35E secondary transfer device 43 fixing roller 50, 50A to 50E secondary transfer member 51 base 52 plunger solenoid 54 spring 55 plunger solenoid Drive circuit 56 Transfer bias power supply 60, 60A to 60E Main body 61, 61A, 61A-1, 61A-2 First member 62, 62A, 62A-1, 62A-2 Second member 63 Screw 70 Temperature sensor 71 Humidity sensor 72 control circuit 90, 90-1, 90-2 third member 101 motor 111 first conductive fluorine processed surface 112 second conductive fluorine processed surface
Claims (3)
担持体に圧接して、該像担持体上のトナー像を移送され
る記録媒体に転写する転写部材とを有する像記録装置に
おいて、 該転写部材は、転写動作時に回転しない構造であり、且
つ、物理的特性が互いに異なる複数の圧接部分を有する
構成であり、 条件に応じて上記複数の圧接部分の中から選択された圧
接部分が該像担持体に圧接する構成としたことを特徴と
する像記録装置。1. An image recording apparatus comprising: an image carrier on which a toner image is formed; and a transfer member for pressing the image carrier to transfer the toner image on the image carrier to a recording medium to be transferred. Wherein the transfer member has a structure that does not rotate during the transfer operation and has a plurality of press-contact portions having different physical characteristics from each other, and a press-contact portion selected from the plurality of press-contact portions according to conditions. An image recording apparatus, wherein a portion is pressed against the image carrier.
適した抵抗率を有する常温用圧接部分と、高温多湿での
転写条件に適した抵抗率を有する高温多湿用圧接部分と
よりなる構成としたことを特徴とする請求項１記載の像
記録装置。2. The plurality of pressure contact portions include a normal temperature pressure contact portion having a resistivity suitable for transfer conditions at normal temperature and a high temperature / humidity pressure contact portion having a resistivity suitable for transfer conditions at high temperature and high humidity. 2. The image recording apparatus according to claim 1, wherein the image recording apparatus has a configuration.
条件に適した硬度を有する普通紙用圧接部分と、厚紙に
対する転写条件に適した硬度を有する厚紙用圧接部分と
よりなる構成としたことを特徴とする請求項１記載の像
記録装置。3. A plurality of press-contact portions comprising a press-contact portion for plain paper having hardness suitable for transfer conditions on plain paper, and a press-contact portion for thick paper having hardness suitable for transfer conditions on thick paper. The image recording apparatus according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20908597A JPH1152763A (en) | 1997-08-04 | 1997-08-04 | Image recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20908597A JPH1152763A (en) | 1997-08-04 | 1997-08-04 | Image recording device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1152763A true JPH1152763A (en) | 1999-02-26 |
Family
ID=16567032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20908597A Withdrawn JPH1152763A (en) | 1997-08-04 | 1997-08-04 | Image recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1152763A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6496679B2 (en) * | 2000-05-26 | 2002-12-17 | Canon Kabushiki Kaisha | Pivotally movable abutment mechanism, charging device and image forming apparatus |
| US7209692B2 (en) | 2005-02-04 | 2007-04-24 | Konica Minolta Business Technologies, Inc. | Color image forming apparatus and discharging device before secondary transfer of the same |
-
1997
- 1997-08-04 JP JP20908597A patent/JPH1152763A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6496679B2 (en) * | 2000-05-26 | 2002-12-17 | Canon Kabushiki Kaisha | Pivotally movable abutment mechanism, charging device and image forming apparatus |
| US7209692B2 (en) | 2005-02-04 | 2007-04-24 | Konica Minolta Business Technologies, Inc. | Color image forming apparatus and discharging device before secondary transfer of the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20030185602A1 (en) | Belt device and unit device including belt device and image forming apparatus using the belt device and unit device | |
| US20090162098A1 (en) | Image forming apparatus | |
| JP5247391B2 (en) | Image forming apparatus | |
| JP2019200283A (en) | Image forming device | |
| US7831177B2 (en) | Discharge device, image forming unit and apparatus | |
| JP5127379B2 (en) | Image forming apparatus | |
| JPH04313539A (en) | Low lateral power drive roll system | |
| US5552871A (en) | Image transferring device for image forming apparatus | |
| JPH1152763A (en) | Image recording device | |
| US7228092B2 (en) | Image forming apparatus using a liquid developer including a carrier liquid with toner particles dispersed in a solvent | |
| JP2001034082A (en) | Image forming device | |
| US6334040B1 (en) | Transfer roller whose non-driving-side end portion has a smaller diameter | |
| JP2863201B2 (en) | Developing device | |
| US7006775B2 (en) | Image forming apparatus with electrically conduction rotary member for electrically connecting a plurality of developing devices to a main body of the apparatus | |
| JP2012181407A (en) | Charging device and image forming apparatus | |
| JP3138085B2 (en) | Image forming device | |
| JP2004086210A (en) | Long-life charging device | |
| JP2974438B2 (en) | Image forming apparatus having transfer charging means | |
| JPH0425885A (en) | Transfer device | |
| JP2626578B2 (en) | Developing device | |
| JP3380325B2 (en) | Developing device | |
| JPH11334925A (en) | Belt conveyor for image forming device | |
| US5956550A (en) | Method and device for preventing formation of background image in electrophotographic image forming apparatus | |
| JPH02228683A (en) | Transfer device | |
| JP2006284807A (en) | Image forming apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20041005 |