JP2002278365A - Wide endless belt and device equipped with the same - Google Patents
Wide endless belt and device equipped with the sameInfo
- Publication number
- JP2002278365A JP2002278365A JP2001080495A JP2001080495A JP2002278365A JP 2002278365 A JP2002278365 A JP 2002278365A JP 2001080495 A JP2001080495 A JP 2001080495A JP 2001080495 A JP2001080495 A JP 2001080495A JP 2002278365 A JP2002278365 A JP 2002278365A
- Authority
- JP
- Japan
- Prior art keywords
- belt
- endless belt
- wide endless
- driving device
- elastic
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、転写搬送ベル
ト、中間転写ベルト、感光体ベルトなどの幅広無端ベル
トを用いたベルト駆動装置、例えば、複写機やプリンタ
などの画像形成装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt driving apparatus using a wide endless belt such as a transfer / transport belt, an intermediate transfer belt, and a photoreceptor belt, for example, an image forming apparatus such as a copying machine or a printer.
【０００２】[0002]
【従来の技術】従来、この種の幅広無端ベルトは、複写
機やプリンタなどの画像形成装置などに無端状の中間転
写ベルトや転写搬送ベルトとして用いられており、複数
本の回転部材に掛け渡されて駆動されている。2. Description of the Related Art Conventionally, wide endless belts of this type have been used as endless intermediate transfer belts and transfer conveyance belts in image forming apparatuses such as copying machines and printers, and are stretched over a plurality of rotating members. Have been driven.
【０００３】ところが、ベルトや回転部材に寸法誤差が
あったり、組み立て誤差があったりすることにより、ベ
ルト走行中にベルト寄りが発生していた。このベルト寄
りを防止するため、ベルトの内周面の幅方向端部に寄り
防止のガイドを貼り付けたものがあるが、ベルトの寄り
力が大きいとガイドが回転部材であるローラに乗り上げ
たり、ガイドを貼り付けた部分が折れ曲がったりする問
題があった。このようなことが繰り返されると、ベルト
は、クラックが入り破損しやすくなっていた。However, the belt or the rotating member has a dimensional error or an assembling error, so that the belt is shifted during the running of the belt. In order to prevent this belt shift, there is a belt in which a guide for preventing shift is attached to the widthwise end of the inner peripheral surface of the belt.However, if the shift force of the belt is large, the guide rides on the roller as a rotating member, There was a problem that the part where the guide was pasted was bent. When such a process was repeated, the belt was easily cracked and damaged.
【０００４】この対策として、ガイドに傾斜部を設けて
折れ曲がりや乗り上げを少なくしているもの(特開平7−
187435)、ベルトに補強材を接着しその上にガイドを接
着してクラックが入りにくくしているもの(特開平10−6
3140)、ベルトエッジ位置を検出してベルトを張架して
いるローラの傾きを調整するもの(特開平11−295948)が
提案されている。[0004] As a countermeasure, a guide is provided with an inclined portion to reduce bending and riding (Japanese Patent Laid-Open No. 7-1995).
187435), a reinforcing material adhered to the belt, and a guide is adhered thereon to prevent cracks (JP-A-10-6
3140), a device that detects the belt edge position and adjusts the inclination of the roller that stretches the belt (JP-A-11-295948) has been proposed.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前2者
はそれぞれでは十分でなく、製作工数が増加したり、ガ
イドの真直度を出すのが難しく、画像劣化の原因となっ
ていた。また、後者は、ベルトの位置検出手段とローラ
の傾き調整機構が必要になるので高価なものになってい
た。However, each of the former two methods is not sufficient, and the number of manufacturing steps is increased, and it is difficult to achieve straightness of the guide, which causes image deterioration. The latter is expensive because it requires a belt position detecting means and a roller inclination adjusting mechanism.
【０００６】そこで、この発明は、簡単な構成でベルト
寄りの発生しない安定した回転駆動が行え、耐久性のあ
る幅広無端ベルトを用いたベルト駆動装置を提供するこ
とを目的としている。SUMMARY OF THE INVENTION An object of the present invention is to provide a belt driving device using a wide endless belt which is durable and can be driven stably with a simple structure and does not cause belt deviation.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明は、幅方向中央部に弾性係数の大き
な芯体層を配置し、幅方向全体あるいは少なくとも片側
に前記芯体層よりも弾性係数の小さな弾性体層を配置し
て形成した幅広無端ベルトを複数の回転部材で張架して
回転駆動させるとともに、少なくとも一個の回転部材の
少なくとも一方端部を中央部より大径にした大径部と
し、該大径部が前記幅広無端ベルトの端の前記弾性体層
の内側に位置するように架け渡したことを特徴とするベ
ルト駆動装置としている。In order to achieve the above object, according to the first aspect of the present invention, a core layer having a large elastic coefficient is disposed at a central portion in a width direction, and the core layer is provided on the entire width direction or on at least one side. A wide endless belt formed by arranging an elastic layer having a smaller elastic coefficient than the plurality of rotating members is rotated and driven to rotate, and at least one end of at least one rotating member has a larger diameter than the center. A belt driving device, wherein the large-diameter portion is bridged such that the large-diameter portion is located inside the elastic layer at the end of the wide endless belt.
【０００８】請求項１の発明によれば、伸びの少ない芯
体層が大径部にかからず直進性を与え、大径部にかかっ
ている伸びのある弾性体層が大径部からはみ出した部分
を縮め、大径部を外側から抱え込むようになってベルト
の寄りや蛇行が規制されるので、簡単な構成でベルト寄
りの発生しない安定した回転駆動が行え、耐久性のある
幅広無端ベルトを用いたベルト駆動装置を提供する。According to the first aspect of the present invention, the core layer having small elongation provides straightness without being applied to the large diameter portion, and the elastic layer extending over the large diameter portion protrudes from the large diameter portion. The belt has a large-diameter part that is held from the outside, and the deviation and meandering of the belt are regulated.Thus, a simple configuration enables stable rotation drive without belt deviation, and a durable wide endless belt. And a belt drive device using the same.
【０００９】また、請求項２の発明は、請求項１におい
て、前記芯体層は、前記弾性体層の内周側に配置されて
いることを特徴とするベルト駆動装置としている。Further, the invention according to claim 2 is the belt driving device according to claim 1, wherein the core layer is disposed on an inner peripheral side of the elastic layer.
【００１０】請求項２の発明によれば、請求項１の効用
に加え、直接回転部材に接触するので幅広無端ベルトに
伸びる余裕がなく直進性は一層良好となる。According to the second aspect of the invention, in addition to the effects of the first aspect, there is no room to extend to the wide endless belt because it is in direct contact with the rotating member, so that the straightness is further improved.
【００１１】また、請求項３の発明は、請求項１におい
て、前記芯体層は、内部に補強芯材が配置されているこ
とを特徴とするベルト駆動装置としている。The invention according to claim 3 is the belt driving device according to claim 1, wherein the core layer has a reinforcing core disposed inside.
【００１２】請求項３の発明によれば、請求項１の効用
に加え、芯体層に一層伸びを少なくさせるため、幅広無
端ベルトの直進性が一層良好となる。According to the third aspect of the present invention, in addition to the effects of the first aspect, since the elongation of the core layer is further reduced, the straightness of the wide endless belt is further improved.
【００１３】また、請求項４の発明は、請求項１におい
て、前記弾性体層は、幅方向中央部が高弾性係数で、両
側が低弾性係数で一体にあるいは別体に形成されている
ことを特徴とするベルト駆動装置としている。According to a fourth aspect of the present invention, in the first aspect, the elastic layer is formed integrally or separately with a high elastic modulus at a center in a width direction and a low elastic modulus on both sides. The belt driving device is characterized by the following.
【００１４】請求項４の発明によれば、請求項１の効用
に加え、弾性体層の中央部が伸びの少ないものとなるた
め一層直進性が良好となり、一体の場合はベルトの製作
工数が少なくなり、別体の場合は弾性係数の組み合わせ
の選択が自由に行える。According to the fourth aspect of the present invention, in addition to the effects of the first aspect, since the central portion of the elastic layer has less elongation, the straightness can be further improved. In the case of a separate body, the combination of the elastic coefficients can be freely selected.
【００１５】また、請求項５の発明は、請求項１におい
て、前記弾性体層は、幅方向中央部が厚く、両側が薄く
形成されていることを特徴とするベルト駆動装置として
いる。According to a fifth aspect of the present invention, there is provided the belt driving device according to the first aspect, wherein the elastic layer is formed so as to be thick at the center in the width direction and thin at both sides.
【００１６】請求項５の発明によれば、請求項１の効用
に加え、中央部の伸びが小さくなり、直進性が一層良好
となる。According to the fifth aspect of the invention, in addition to the effects of the first aspect, the elongation at the center is reduced, and the straightness is further improved.
【００１７】また、請求項６の発明は、請求項１におい
て、前記大径部は、中央部に向かって中央部径まで小径
になるテーパ部を備えていることを特徴とするベルト駆
動装置としている。According to a sixth aspect of the present invention, there is provided a belt driving device according to the first aspect, wherein the large-diameter portion has a tapered portion whose diameter decreases toward the central portion toward the central portion. I have.
【００１８】請求項６の発明によれば、請求項１の効用
に加え、中央部と大径部との段差が無くなり、ベルトの
浮き上がりが無くなり、いっそう直進安定性がます。According to the sixth aspect of the present invention, in addition to the effects of the first aspect, there is no step between the central portion and the large-diameter portion, so that the belt does not float, and the straight running stability is further improved.
【００１９】さらに、請求項７の発明は、請求項１〜６
のいずれか一つのベルト駆動装置を備えたことを特徴と
する画像形成装置としている。Further, the invention according to claim 7 is based on claims 1 to 6
And an image forming apparatus provided with any one of the belt driving devices.
【００２０】請求項７の発明によれば、直進性の良好な
幅広無端ベルトを使用しているため、歪みのない安定し
た画像が得られる画像形成装置を提供することができ
る。According to the seventh aspect of the present invention, since the wide endless belt having good linearity is used, an image forming apparatus capable of obtaining a stable image without distortion can be provided.
【００２１】[0021]
【発明の実施の形態】次に、図面に基づいてこの発明を
説明する。Next, the present invention will be described with reference to the drawings.
【００２２】図１は、この発明の一実施形態を示す電子
写真方式のカラー画像形成装置の概略構成図である。こ
の装置には、それぞれ印字色の異なる画像を形成する複
数の、ここでは４個の感光体（ＰＣ）110が併設されて
いる。この感光体１１０には、それぞれ図示を省略した
露光装置が設けられている。FIG. 1 is a schematic configuration diagram of an electrophotographic color image forming apparatus showing an embodiment of the present invention. This apparatus is provided with a plurality of, here four, photoconductors (PCs) 110 for forming images of different print colors. The photoconductor 110 is provided with an exposure device (not shown).
【００２３】この露光装置は、スキャナなどによって色
分解された画像情報に対応する光信号を半導体レーザか
ら出射させ、そのレーザ光を回転駆動されるポリゴンミ
ラーにより感光体１１０に走査するもので、その走査光
路中には収束用及びポリゴンミラーの面倒れ補正用のレ
ンズやレーザ光を偏向するミラーなどが配設されてい
る。さらに、それぞれの感光体１１０の外周には、帯電
チャージャ１３０と、現像手段としての現像ユニット１
２０と、クリーニング部材１４０とが配設されている。This exposure apparatus emits an optical signal corresponding to image information color-separated by a scanner or the like from a semiconductor laser, and scans the laser beam on a photosensitive member 110 by a polygon mirror driven to rotate. In the scanning optical path, a lens for convergence and a lens for correcting surface tilt of the polygon mirror, a mirror for deflecting laser light, and the like are provided. Further, on the outer periphery of each photoconductor 110, a charging charger 130 and a developing unit 1 as a developing unit are provided.
20 and a cleaning member 140 are provided.
【００２４】一方、幅広無端ベルト２００は、ここに示
す中間転写ベルトのほかに転写搬送ベルトがあり、複数
の回転部材３００に張架させられて回転駆動させられて
いる。回転部材３００は、ベルト駆動ローラ３１０、テ
ンションローラ３２０、従動ローラ３３０、複数のアイ
ドラローラ３４０、複数の転写ローラ３５０及び対向ロ
ーラ３６０であり、これら回転部材３００に張架された
幅広無端ベルト２００は、感光体１１０に転写ローラ３
５０とで挟まれて圧接され一次転写手段を形成してい
る。On the other hand, the wide endless belt 200 includes a transfer conveyance belt in addition to the intermediate transfer belt shown here, and is stretched around a plurality of rotating members 300 to be driven to rotate. The rotating member 300 is a belt driving roller 310, a tension roller 320, a driven roller 330, a plurality of idler rollers 340, a plurality of transfer rollers 350, and an opposing roller 360. The wide endless belt 200 stretched around these rotating members 300 , Transfer roller 3 to photoconductor 110
The first transfer means is sandwiched and pressed between the first transfer means and the first transfer means.
【００２５】また、幅広無端ベルト２００を張設してい
る対向ローラ３６０に、２次転写ローラ３７０が圧接さ
れている。さらにこの装置の下部には、図示しない給紙
カセットとそこから一枚づつ給紙する給紙ローラが設け
られ、ここからの転写紙を２次転写ローラ３７０へ送り
出すレジストローラ３８０が設けられている。ベルト駆
動ローラ３１０の上部には、図示しないが、定着ローラ
とプレスローラとが互いに接して回転自在に設けられ、
定着ローラを通過する転写紙を排紙トレイに排出する排
紙ローラが設けられている。A secondary transfer roller 370 is pressed against an opposing roller 360 on which the wide endless belt 200 is stretched. Further, a paper feed cassette (not shown) and a paper feed roller for feeding paper one by one from the cassette are provided below the apparatus, and a registration roller 380 for feeding the transfer paper from the paper feed cassette to the secondary transfer roller 370 is provided. . Although not shown, a fixing roller and a press roller are provided on the upper portion of the belt driving roller 310 so as to be rotatable in contact with each other,
A paper discharge roller for discharging the transfer paper passing through the fixing roller to a paper discharge tray is provided.
【００２６】このような構成において、各感光体１１０
にはそれぞれ印字色が異なる画像が形成される。ここで
は、図中左に位置する感光体１１０に対する画像形成プ
ロセスに付いて説明するが、他の感光体１１０に対する
画像形成プロセスは同様の原理につき説明を省略する。In such a configuration, each photoconductor 110
Are formed with different print colors. Here, the image forming process for the photoconductor 110 located on the left side in the figure will be described, but the image forming processes for the other photoconductors 110 will not be described because of the same principle.
【００２７】まず、感光体１１０は回転中に帯電チャー
ジャ１３０からの電荷により一様に帯電される。一色目
の印字色に色分解された画像情報に基づき前記露光装置
が駆動され、これにより、感光体１１０の帯電部分に静
電潜像が形成される。この静電潜像は、現像ユニット１
２０により現像され、トナー像となる。その他の印字色
も順次トナー像を形成し幅広無端ベルト２００上に重ね
一次転写される。First, the photosensitive member 110 is uniformly charged by the charge from the charger 130 during rotation. The exposure device is driven based on the image information color-separated into the first printing color, whereby an electrostatic latent image is formed on the charged portion of the photoconductor 110. This electrostatic latent image is stored in the developing unit 1
20 to form a toner image. Other printing colors are sequentially formed as toner images and are primarily transferred onto the wide endless belt 200 in a superimposed manner.
【００２８】一方、給紙ローラにより引き出された転写
紙はその先端がレジストローラ３８０のニップ部に当接
した状態で待機状態に維持され、感光体１１０の回転運
動に同期して回転するレジストローラ３８０により２次
転写位置に搬送され、幅広無端ベルト２００上のトナー
像が転写紙に転写される。画像が重ねて転写された転写
紙は、幅広無端ベルト２００から分離されて定着ローラ
プレスローラとにより搬送される過程で転写画像が定着
され、排紙ローラにより排紙トレイに排紙される。ま
た、一次転写の都度、感光体１１０上に付着した残トナ
ーはクリーニング部材１４０により除去される。On the other hand, the transfer paper pulled out by the paper feed roller is maintained in a standby state with its leading end abutting on the nip portion of the registration roller 380, and is rotated in synchronization with the rotation of the photoconductor 110. The toner image on the wide endless belt 200 is conveyed to the secondary transfer position by 380, and is transferred onto a transfer sheet. The transfer paper on which the images are superimposed and transferred is separated from the wide endless belt 200, and the transferred image is fixed in a process of being conveyed by the fixing roller press roller, and is discharged to a discharge tray by a discharge roller. In addition, each time the primary transfer is performed, the residual toner attached to the photoconductor 110 is removed by the cleaning member 140.
【００２９】この画像形成装置においては、図２に示す
ように幅広無端ベルト２００の片寄り、蛇行による画質
の低下を防止するために、幅広無端ベルト２００を中央
部より弾性係数を小さくした端部の弾性体層より内側に
なるように回転部材３００の大径部３０２を設けてい
る。ここでは、図１に示す幅広無端ベルト２００を張架
する複数の回転部材３００のうち駆動ローラ３１０、テ
ンションローラ３２０、従動ローラ３３０のみを示しあ
とは省略している。回転部材３００は、図１３〜１７に
も示すように中央部３０１の外径よりも少なくとも一方
の側の端部が大径にした大径部３０２が形成されてお
り、軸３０３がその中心に両端が突出して設けられてい
る。図１４と図１７の大径部は、中央部３０１に向かっ
て中央部径まで小径になるテーパ部３０４を備えてい
る。In this image forming apparatus, as shown in FIG. 2, in order to prevent the wide endless belt 200 from being offset or meandering, thereby reducing the image quality, the wide endless belt 200 has an end portion having an elastic coefficient smaller than that of the center portion. The large diameter portion 302 of the rotating member 300 is provided so as to be inside the elastic layer. Here, among the plurality of rotating members 300 that stretch the wide endless belt 200 shown in FIG. 1, only the driving roller 310, the tension roller 320, and the driven roller 330 are shown, and the description is omitted. As shown in FIGS. 13 to 17, the rotating member 300 has a large-diameter portion 302 in which at least one end has a larger diameter than the outer diameter of the central portion 301, and a shaft 303 is provided at the center thereof. Both ends are provided so as to protrude. The large diameter portion in FIGS. 14 and 17 includes a tapered portion 304 whose diameter decreases toward the central portion 301 to the central portion diameter.
【００３０】このような回転部材３００に幅広無端ベル
ト２００は掛け渡され、テンションローラ３２０によっ
て外側に張力が加えられ、回転部材３００の中央部３０
１との間に浮くことなく接触する。また。この無端ベル
ト２００は、図示しないスプリングでテンションローラ
３２０を移動させて張られ、駆動ローラ３１０の摩擦駆
動で搬送される。The wide endless belt 200 is stretched around such a rotating member 300, tension is applied to the outside by a tension roller 320, and the central portion 30 of the rotating member 300 is
1. Contact without floating between them. Also. The endless belt 200 is tensioned by moving a tension roller 320 by a spring (not shown), and is conveyed by friction driving of a driving roller 310.
【００３１】すなわち、幅方向中央部に弾性係数の大き
な芯体層２１０を配置し、幅方向全体あるいは少なくと
も片側に芯体層２１０よりも弾性係数の小さな弾性体層
２２０を配置して形成した幅広無端ベルト２００を複数
の回転部材３００で張架して回転駆動させるとともに、
少なくとも一個の回転部材３００の少なくとも一方端部
を中央部３０１より大径にした大径部３０２とし、この
大径部３０２が幅広無端ベルト２００の端の弾性体層２
２０の内側に位置するように架け渡してベルト駆動装置
としている。In other words, the core layer 210 having a large elastic coefficient is disposed at the center in the width direction, and the elastic layer 220 having a smaller elastic coefficient than the core layer 210 is disposed on the entire width direction or at least on one side. While the endless belt 200 is stretched and driven by a plurality of rotating members 300,
At least one end of at least one rotating member 300 is a large-diameter portion 302 having a larger diameter than the central portion 301, and the large-diameter portion 302 is the elastic layer 2 at the end of the wide endless belt 200.
20 so as to be located inside the belt drive device.
【００３２】図３は、図２の構成に補正ローラ３９０を
加えた構成である。この補正ローラ３９０は、大径部３
０２を片側にのみ有しており、他のローラ３１０,３２
０,３３０に対し傾けて装着され、この傾けによって大
径部３０２とは反対側(矢印方向)に片寄りが発生するよ
うになる。補正ローラ３９０は、傾きを調整してベルト
の片寄り力を調整できるようにされている。FIG. 3 shows a configuration in which a correction roller 390 is added to the configuration of FIG. The correction roller 390 is provided in the large diameter portion 3.
02 on only one side, and the other rollers 310, 32
The large-diameter portion 302 is inclined with respect to the large-diameter portion 302 (in the direction of the arrow). The correction roller 390 is configured to adjust the inclination to adjust the biasing force of the belt.
【００３３】芯体層２１０は、例えば、ポリエチレン、
ポリカーボネート、ポリフッ化ビニリデン(ＰＶｄＦ)、
ポリイミドなどの弾性係数の大きな合成樹脂材料あるい
はウレタンゴム、ニトリルゴム、エチレンープロピレン
ージエン共重合ゴム(ＥＰＤＭ）等のエラストマー材料
を用いて形成されている。また、弾性体層２２０は、弾
性係数の小さなポリウレタンゴム、ネオプレンゴム、ウ
レタンゴム、クロロプレンゴム、ニトリルゴム、シリコ
ンゴムなどのエラストマー材料を用いて形成されてい
る。The core layer 210 is made of, for example, polyethylene,
Polycarbonate, polyvinylidene fluoride (PVdF),
It is formed using a synthetic resin material having a large elastic coefficient such as polyimide or an elastomer material such as urethane rubber, nitrile rubber, and ethylene-propylene diene copolymer rubber (EPDM). The elastic layer 220 is formed of an elastomer material having a small elastic coefficient, such as polyurethane rubber, neoprene rubber, urethane rubber, chloroprene rubber, nitrile rubber, and silicone rubber.
【００３４】伸びの少ない芯体層２１０が大径部３０２
にかからず直進性を与え、大径部３０２にかかっている
伸びのある弾性体層２２０が大径部３０２からはみ出し
た部分を縮め、大径部３０２を外側から抱え込むように
なってベルトの寄りや蛇行が規制されるので、簡単な構
成でベルト寄りの発生しない安定した回転駆動が行え、
耐久性のある幅広無端ベルト２００を用いたベルト駆動
装置を提供している。The core layer 210 having a small elongation has a large diameter portion 302.
The stretchable elastic layer 220 applied to the large-diameter portion 302 shrinks the portion of the large-diameter portion 302 protruding from the large-diameter portion 302 and holds the large-diameter portion 302 from the outside. Since the deviation and meandering are regulated, stable rotation can be performed with a simple configuration without belt deviation.
A belt driving device using a durable wide endless belt 200 is provided.
【００３５】図４〜図８に示す幅広無端ベルト２００
は、中央部に芯体層２１０が設けられ、弾性体層２２０
が全幅に渡って設けられた実施例であり、芯体層２１０
が内周面側に設けられて伸びができるだけでないように
配慮している。図４は芯体層２１０を弾性体層２２０の
厚みの中に取り込んでベルトを同一厚さにしている。図
５は、芯体層２１０を薄い同一厚さの弾性体層２２０の
内周面側に貼り付けている。図６は、芯地層２１０を弾
性体層野内周面側の内部にウレタン、ポリイミドなどの
樹脂やニッケル、ステンレスなどの金属の薄膜体、ある
いはアラミド、グラスファイバーの芯線、ポリエステ
ル、ポリアミドの織物の補強芯材を取り込んで配置して
構成している。図７は、弾性体層220自体が、幅方向中
央部を大きな弾性係数にした高弾性率層２２１、両端部
をより伸びやすくするため弾性係数を小さくした低弾性
率層２２２としている。勿論、別体であっても良い。図
８は、弾性体層２２０の芯体層２１０を外れる両側を薄
肉にし、両側の伸びをよくしている。The wide endless belt 200 shown in FIGS.
Is provided with a core layer 210 at the center, and an elastic layer 220
Is an embodiment provided over the entire width, and the core layer 210
Is provided on the inner peripheral surface side so that elongation is not only possible. In FIG. 4, the core layer 210 is incorporated into the thickness of the elastic layer 220 so that the belt has the same thickness. In FIG. 5, the core layer 210 is attached to the inner peripheral surface side of the thin elastic layer 220 having the same thickness. FIG. 6 shows that the interlining layer 210 is provided inside the elastic layer on the inner peripheral surface side of a resin such as urethane or polyimide, or a thin film of metal such as nickel or stainless steel, or a core wire of aramid or glass fiber, and reinforcement of a woven fabric of polyester or polyamide. The core material is taken in and arranged. In FIG. 7, the elastic layer 220 itself is a high elastic modulus layer 221 having a large elastic coefficient at the center in the width direction, and a low elastic modulus layer 222 having a small elastic coefficient at both ends to make it easier to stretch. Of course, they may be separate. In FIG. 8, both sides of the elastic layer 220 that are separated from the core layer 210 are made thinner to improve both sides.
【００３６】図９〜図１２に示す幅広無端ベルト２００
は、中央部に配置された芯体層２１０に対し、少なくと
も幅方向一方の側に弾性体層２２０が配置されている。
すなわち、図９、図１０、図１２は、別体にされた弾性
体層２２０が芯体層２１０からはみ出して設けられてい
る。図１１は、弾性体層２２０が片側にのみ設けられた
事例である。図１２は、芯体層２１０と弾性体層２２０
との間にポリエステル、ポリイミド、ナイロン、ポリプ
ロピレン、ポリエチレンテレフタレートなどの樹脂から
なる補強部材２３０が用いられた事例である。芯体層２
１０が弾性体層２２０に引っ張られたり、大径部３０２
での折れ曲がりに対してクラックが発生するのを防止し
ている。The wide endless belt 200 shown in FIGS.
The elastic layer 220 is disposed on at least one side in the width direction with respect to the core layer 210 disposed at the center.
That is, in FIGS. 9, 10, and 12, the separate elastic layer 220 is provided so as to protrude from the core layer 210. FIG. 11 shows an example in which the elastic layer 220 is provided only on one side. FIG. 12 shows the core layer 210 and the elastic layer 220.
In this case, a reinforcing member 230 made of a resin such as polyester, polyimide, nylon, polypropylene, or polyethylene terephthalate is used. Core layer 2
10 is pulled by the elastic layer 220 or the large-diameter portion 302
Cracks are prevented from being generated due to bending at the surface.
【００３７】図１３は、幅広無端ベルト２００が回転部
材３００に張架されている状態である。回転部材３００
の両端部の大径部３０２には弾性体層２２０がはみだし
て覆い、中央部３０１には芯体層２１０が密着してい
る。このため、大径部３０２の内側とはみだした外側の
弾性体層２２０が大径部３０２を抱え込むように縮んで
ベルトの直進性を良好にし、ずれや蛇行を生じさせな
い。FIG. 13 shows a state in which the wide endless belt 200 is stretched around the rotating member 300. Rotating member 300
The elastic layer 220 protrudes and covers the large-diameter portions 302 at both ends, and the core layer 210 is in close contact with the central portion 301. For this reason, the elastic layer 220 outside the inside of the large-diameter portion 302 and shrinks so as to hold the large-diameter portion 302, thereby improving the straightness of the belt and preventing the belt from shifting or meandering.
【００３８】図１４は、回転部材３００の大径部３０２
から中央部３０１の径までに向かってテーパ状にした構
成で、ここに幅広無端ベルト２００が張架された状態で
ある。テーパ状にすることによって芯体層２１０の端と
大径部３０２との隙間を、より小さなテーパ部３０４と
の隙間にし、浮き上がりを防止し、ずれ難く、蛇行し難
くしている。また、大径部３０２との段差部でベルトの
折れ曲がりなどが小さくなりベルトの寿命が長くなる。FIG. 14 shows the large diameter portion 302 of the rotating member 300.
From the center part 301 to the diameter of the central part 301. Here, the wide endless belt 200 is stretched. The tapered shape makes the gap between the end of the core layer 210 and the large-diameter portion 302 a smaller gap between the tapered portion 304, prevents floating, prevents slippage and meandering. Further, bending of the belt at the stepped portion with the large diameter portion 302 is reduced, and the life of the belt is extended.
【００３９】図１５は、図１３と同じ回転部材３００の
大径部３０２に芯体層２１０の両側に設けられた弾性体
層２２０が掛けられた状態であり、図１３に示す構成と
同様な効用をする。FIG. 15 shows a state where the elastic layers 220 provided on both sides of the core layer 210 are hung on the large diameter portion 302 of the same rotating member 300 as in FIG. 13, and is similar to the configuration shown in FIG. Do a utility.
【００４０】図１６は、回転部材３００の片側にのみ大
径部３０２が形成された補正ローラ３９０で、図３の位
置に配置され、幅広無端ベルト２００が芯体層２１０の
片側にのみ弾性体層２２０を配置し、この弾性体層２２
０を大径部３０２に被せている。前述したように補正ロ
ーラ３９０の傾きを変えることにより片寄りを矯正する
ことができる。FIG. 16 shows a correction roller 390 having a large-diameter portion 302 formed only on one side of the rotating member 300. The correction roller 390 is arranged at the position shown in FIG. The elastic layer 22 is disposed
0 covers the large diameter portion 302. As described above, the inclination can be corrected by changing the inclination of the correction roller 390.
【００４１】図１７は、図１４と同じ回転部材３００の
大径部３０２及びテーパ部３０４に芯体層２１０の両側
に設けられた弾性体層２２０が掛けられた状態であり、
図１４に示す構成と同様な効用をする。FIG. 17 shows a state where the large-diameter portion 302 and the tapered portion 304 of the same rotating member 300 as in FIG.
It has the same effect as the configuration shown in FIG.
【００４２】以上説明してきた弾性体層２２０は、ゴム
硬度がＪＩＳ−Ａ基準で３０Ｈｓ以上で８０Ｈｓ以下の
エラストマーが良い。硬度が８０Ｈｓを超えると硬すぎ
て回転部材３００のタイ径部３０２のエッジに引っかか
りが弱くベルトの寄り力に負けてベルトの片寄りや蛇行
を規制することが出来ない。また硬度が３０Ｈｓ未満だ
と大径部３０２のエッジへの引っ掛かりは良いが、弾性
体層２２０自体が伸縮しやすく、ベルトの寄り力のばら
つきで、ベルトの蛇行量が大きくなる。The elastic layer 220 described above is preferably an elastomer having a rubber hardness of 30 Hs or more and 80 Hs or less based on JIS-A. When the hardness exceeds 80 Hs, the belt is too hard to be caught on the edge of the tie diameter portion 302 of the rotating member 300 and loses the biasing force of the belt, so that it is not possible to restrict the bias or meandering of the belt. When the hardness is less than 30 Hs, the elastic layer 220 itself easily expands and contracts, although the elastic layer 220 itself easily expands and contracts.
【００４３】また、弾性部材の厚さとしては、０.０８m
m から２mmが好ましい。厚さが２mmを超えると大径部
３０２のエッジに引っかかりが弱くベルトの寄り力に負
けてベルトの片寄りや蛇行を規制することが難しくな
る。また、厚さが０.０８mmより薄くなると大径部３０
２への引っかかりはよくなるが、弾性体層２２０自体が
ベルトの寄り力のばらつきで伸縮量が大きくなり、ベル
トの蛇行も大きくなる。The thickness of the elastic member is 0.08 m.
m to 2 mm is preferred. If the thickness is more than 2 mm, the edge of the large-diameter portion 302 is less likely to be caught on the edge and loses the biasing force of the belt, so that it is difficult to control the belt deviation and meandering. If the thickness is less than 0.08 mm, the large-diameter portion 30
2, the elastic layer 220 itself has a large amount of expansion and contraction due to variation in the biasing force of the belt, and the meandering of the belt also increases.
【００４４】[0044]
【発明の効果】以上説明してきたように、請求項１の発
明によれば、伸びの少ない芯体層が大径部にかからず直
進性を与え、大径部にかかっている伸びのある弾性体層
が大径部からはみ出した部分を縮め、大径部を外側から
抱え込むようになってベルトの寄りや蛇行が規制される
ので、簡単な構成でベルト寄りの発生しない安定した回
転駆動が行え、耐久性のある幅広無端ベルトを用いたベ
ルト駆動装置を提供することができる。As described above, according to the first aspect of the present invention, the core layer having low elongation provides straightness without being applied to the large-diameter portion, and has elongation applied to the large-diameter portion. The elastic layer shrinks the part that protrudes from the large-diameter part, holding the large-diameter part from the outside and restricting the deviation or meandering of the belt. It is possible to provide a belt driving device using a wide endless belt that is durable and durable.
【００４５】また、請求項２の発明によれば、請求項１
の効用に加え、直接回転部材に接触するので幅広無端ベ
ルトに伸びる余裕がなく直進性は一層良好となる。According to the invention of claim 2, according to claim 1,
In addition to the effects described above, since the belt is in direct contact with the rotating member, there is no room for extension to the wide endless belt, and the straightness is further improved.
【００４６】また、請求項３の発明によれば、請求項１
の効用に加え、芯体層に一層伸びを少なくさせるため、
幅広無端ベルトの直進性が一層良好となる。According to the invention of claim 3, according to claim 1,
In addition to the effect of, in order to further reduce the elongation of the core layer,
The straightness of the wide endless belt is further improved.
【００４７】また、請求項４の発明によれば、請求項１
の効用に加え、弾性体層の中央部が伸びの少ないものと
なるため一層直進性が良好となり、一体の場合はベルト
の製作工数が少なくなり、別体の場合は弾性係数の組み
合わせの選択が自由に行える。According to the invention of claim 4, according to claim 1,
In addition to the effect, the central part of the elastic layer has less elongation, so the straightness is better, the integral man-hour reduces the number of man-hours for manufacturing the belt, and the separate body has a combination of elastic coefficients. You can do it freely.
【００４８】また、請求項５の発明によれば、請求項１
の効用に加え、中央部の伸びが小さくなり、直進性が一
層良好となる。According to the invention of claim 5, claim 1 is
In addition to the effect, the elongation at the central portion is reduced, and the straightness is further improved.
【００４９】また、請求項６の発明によれば、請求項１
の効用に加え、中央部と大径部との段差が無くなり、ベ
ルトの浮き上がりが無くなり、いっそう直進安定性がま
す。According to the invention of claim 6, according to claim 1,
In addition to the utility, the step between the central part and the large diameter part is eliminated, the lifting of the belt is eliminated, and the straight running stability is further improved.
【００５０】さらに、請求項７の発明によれば、直進性
の良好な幅広無端ベルトを使用しているため、歪みのな
い安定した画像が得られる画像形成装置を提供すること
ができる。Further, according to the seventh aspect of the present invention, since the wide endless belt having good straightness is used, it is possible to provide an image forming apparatus capable of obtaining a stable image without distortion.
【図１】この発明の実施形態にかかる画像形成装置の要
部概略構成図である。FIG. 1 is a schematic configuration diagram of a main part of an image forming apparatus according to an embodiment of the present invention.
【図２】この発明の実施形態にかかるベルト駆動装置の
概略構成図である。FIG. 2 is a schematic configuration diagram of a belt driving device according to an embodiment of the present invention.
【図３】他のベルト駆動装置の概略構成図である。FIG. 3 is a schematic configuration diagram of another belt driving device.
【図４】幅広無端ベルトの一実施例の断面図である。FIG. 4 is a cross-sectional view of one embodiment of a wide endless belt.
【図５】幅広無端ベルトの他の実施例の断面図である。FIG. 5 is a sectional view of another embodiment of a wide endless belt.
【図６】幅広無端ベルトの他の実施例の断面図である。FIG. 6 is a sectional view of another embodiment of a wide endless belt.
【図７】幅広無端ベルトの他の実施例の断面図である。FIG. 7 is a sectional view of another embodiment of a wide endless belt.
【図８】幅広無端ベルトの他の実施例の断面図である。FIG. 8 is a cross-sectional view of another embodiment of the wide endless belt.
【図９】幅広無端ベルトの他の実施例の断面図である。FIG. 9 is a sectional view of another embodiment of the wide endless belt.
【図１０】幅広無端ベルトの他の実施例の断面図であ
る。FIG. 10 is a sectional view of another embodiment of the wide endless belt.
【図１１】幅広無端ベルトの他の実施例の断面図であ
る。FIG. 11 is a sectional view of another embodiment of a wide endless belt.
【図１２】幅広無端ベルトの他の実施例の断面図であ
る。FIG. 12 is a sectional view of another embodiment of the wide endless belt.
【図１３】回転部材に幅広無端ベルトを張架した一実施
例の説明図である。FIG. 13 is an explanatory diagram of one embodiment in which a wide endless belt is stretched around a rotating member.
【図１４】回転部材に幅広無端ベルトを張架した他の実
施例の説明図である。FIG. 14 is an explanatory view of another embodiment in which a wide endless belt is stretched around a rotating member.
【図１５】回転部材に幅広無端ベルトを張架した他の実
施例の説明図である。FIG. 15 is an explanatory view of another embodiment in which a wide endless belt is stretched around a rotating member.
【図１６】回転部材に幅広無端ベルトを張架した他の実
施例の説明図である。FIG. 16 is an explanatory view of another embodiment in which a wide endless belt is stretched around a rotating member.
【図１７】回転部材に幅広無端ベルトを張架した他の実
施例の説明図である。FIG. 17 is an explanatory view of another embodiment in which a wide endless belt is stretched around a rotating member.
２００ 幅広無端ベルト ２１０ 芯体層 ２２０ 弾性体層 ３００ 回転部材 200 wide endless belt 210 core layer 220 elastic layer 300 rotating member
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H035 CA05 CB06 CF02 2H200 GA12 GA23 GA34 HA12 HB03 JA02 JB07 JB43 JC04 JC13 JC15 JC17 LA17 LA25 MA03 MA04 MA11 MA12 MA20 MC01 MC02 3F049 AA10 BB07 BB11 DA03 LA02 LA07 LB03 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H035 CA05 CB06 CF02 2H200 GA12 GA23 GA34 HA12 HB03 JA02 JB07 JB43 JC04 JC13 JC15 JC17 LA17 LA25 MA03 MA04 MA11 MA12 MA20 MC01 MC02 3F049 AA10 BB07 BB11 DA03 LA02 LA07 LB03
Claims (7)
配置し、幅方向全体あるいは少なくとも片側に前記芯体
層よりも弾性係数の小さな弾性体層を配置して形成した
幅広無端ベルトを複数の回転部材で張架して回転駆動さ
せるとともに、少なくとも一個の回転部材の少なくとも
一方端部を中央部より大径にした大径部とし、該大径部
が前記幅広無端ベルトの端の前記弾性体層の内側に位置
するように架け渡したことを特徴とするベルト駆動装
置。1. A wide endless belt formed by arranging a core layer having a large elastic coefficient at a central portion in the width direction and arranging an elastic layer having a smaller elastic coefficient than the core layer on the entire width direction or at least on one side. Along with the rotation of a plurality of rotating members and driven to rotate, at least one end of at least one rotating member is a large diameter portion larger than the center portion, the large diameter portion of the end of the wide endless belt A belt driving device which is bridged so as to be positioned inside the elastic layer.
性体層の内周側に配置されていることを特徴とするベル
ト駆動装置。2. The belt driving device according to claim 1, wherein the core layer is disposed on an inner peripheral side of the elastic layer.
補強芯材が配置されていることを特徴とするベルト駆動
装置。3. The belt driving device according to claim 1, wherein a reinforcing core is disposed inside the core layer.
向中央部が高弾性係数で、両側が低弾性係数で一体にあ
るいは別体に形成されていることを特徴とするベルト駆
動装置。4. The belt driving device according to claim 1, wherein the elastic layer is formed integrally or separately with a high elastic coefficient at a central portion in a width direction and a low elastic coefficient on both sides. .
向中央部が厚く、両側が薄く形成されていることを特徴
とするベルト駆動装置。5. The belt driving device according to claim 1, wherein the elastic layer is formed to be thick at the center in the width direction and thin on both sides.
に向かって中央部径まで小径になるテーパ部を備えてい
ることを特徴とするベルト駆動装置。6. The belt driving device according to claim 1, wherein the large-diameter portion has a tapered portion whose diameter decreases toward the central portion toward the central portion.
装置を備えたことを特徴とする画像形成装置。7. An image forming apparatus comprising the belt driving device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001080495A JP4545336B2 (en) | 2001-03-21 | 2001-03-21 | Belt drive device and image forming apparatus having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001080495A JP4545336B2 (en) | 2001-03-21 | 2001-03-21 | Belt drive device and image forming apparatus having the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002278365A true JP2002278365A (en) | 2002-09-27 |
| JP4545336B2 JP4545336B2 (en) | 2010-09-15 |
Family
ID=18936772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001080495A Expired - Fee Related JP4545336B2 (en) | 2001-03-21 | 2001-03-21 | Belt drive device and image forming apparatus having the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4545336B2 (en) |
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| JP2006267243A (en) * | 2005-03-22 | 2006-10-05 | Fuji Xerox Co Ltd | Image forming apparatus and transfer device for use in the same |
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| JP2012042650A (en) * | 2010-08-18 | 2012-03-01 | Konica Minolta Business Technologies Inc | Image forming device |
| US20120294657A1 (en) * | 2011-05-20 | 2012-11-22 | Makoto Matsushita | Belt-shaped member for image forming apparatus and image forming apparatus |
| CN104284850A (en) * | 2012-03-15 | 2015-01-14 | 兰达公司 | Endless flexible belt for a printing system |
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