JPH04133928A - Belt driving device - Google Patents
Belt driving deviceInfo
- Publication number
- JPH04133928A JPH04133928A JP2258497A JP25849790A JPH04133928A JP H04133928 A JPH04133928 A JP H04133928A JP 2258497 A JP2258497 A JP 2258497A JP 25849790 A JP25849790 A JP 25849790A JP H04133928 A JPH04133928 A JP H04133928A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- meandering
- belt
- meandering detection
- shaft
- 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
- 238000006073 displacement reaction Methods 0.000 claims abstract description 52
- 238000001514 detection method Methods 0.000 claims description 65
- 238000004804 winding Methods 0.000 abstract description 7
- 150000001875 compounds Chemical class 0.000 abstract 2
- 108091008695 photoreceptors Proteins 0.000 description 25
- 239000002131 composite material Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Paper Feeding For Electrophotography (AREA)
- Structure Of Belt Conveyors (AREA)
- Control Of Conveyors (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、平ベルトの駆動装置、特に、電子写真方式を
用いた機器の感光体ベルト、転写搬送ベルト等のベルト
駆動装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drive device for a flat belt, particularly a belt drive device for a photoreceptor belt, a transfer conveyance belt, etc. of a device using an electrophotographic method. .
（従来の技術）
従来より、例えば電子写真装置において、装置の軽量化
及びコンパクト化を目的として、互いに略平行に配置し
た複数本のローラ部材に、表面に感光体層または誘電体
層を形成した平ベルトを掛け渡し、該平ベルトを感光体
ドラムの代わりに感光体ベルト、または転写搬送ベルト
として用いることが知られている。(Prior Art) Conventionally, for example, in an electrophotographic device, a photoreceptor layer or a dielectric layer is formed on the surface of a plurality of roller members arranged substantially parallel to each other in order to make the device lighter and more compact. It is known to span a flat belt and use the flat belt as a photoconductor belt or a transfer conveyance belt instead of a photoconductor drum.
ところが、このような用途に用いられる平ベルトは、プ
ラスチックフィルムや金属箔等、伸びが小さくて強度の
高い材料を基材として形成される場合が多い。従って、
この種の平ベルトは、弾性変形し難いことから、各関連
部品の寸法誤差、ロラ部材の取付誤差、ベルト張力のア
ンバランス、ベルト周長さの不均一などをベルト自体の
変形で吸収することができず、この結果、平ベルトの走
行時に蛇行が発生し易いという問題があった。However, flat belts used for such purposes are often formed from a material with low elongation and high strength, such as a plastic film or metal foil, as a base material. Therefore,
This type of flat belt is difficult to elastically deform, so it is possible to absorb dimensional errors in related parts, installation errors in roller members, imbalance in belt tension, uneven belt circumference, etc. by deforming the belt itself. As a result, there is a problem in that meandering tends to occur when the flat belt runs.
しかし、このような電子写真装置では、正確な画像形成
を行うために、高精度、高解像度が要求されるので、こ
の平ベルトの蛇行を防止する必要がある。However, in such an electrophotographic apparatus, high precision and high resolution are required in order to perform accurate image formation, so it is necessary to prevent the flat belt from meandering.
そして、このような、ベルトの蛇行を防止するための従
来技術として、特開昭５６−１２７５０１号公報や特開
昭５９−２０５０５２号公報に示されるようにベルトに
蛇行防止用のガイドを設けたり、特開昭５７−６０３４
７号公報に示されるように規制部材を設けて平ベルトの
蛇行を強制的に防止することが提案されている。また、
実開昭５８−１１．０６０９号公報や実開昭６４−４８
４５７号公報に示されるような複雑なメカニズム構造を
用いて蛇行を修正するようにしたものもある。As a conventional technique for preventing such belt meandering, a guide for preventing meandering is provided on the belt as shown in Japanese Patent Laid-Open No. 127501/1982 and Japanese Patent Laid-open No. 205052/1983. , Japanese Patent Publication No. 57-6034
As shown in Japanese Patent No. 7, it has been proposed to forcibly prevent meandering of the flat belt by providing a regulating member. Also,
Utility Model Application No. 58-11.0609 and Utility Model Application No. 64-48
Some devices use a complicated mechanism structure to correct meandering, as shown in Japanese Patent No. 457.
（発明が解決しようとする課題）
しかしながら、特開昭５６−１２７５０１号公報、特開
昭５９−２０５０５２号公報及び特開昭５７−６０３４
７号公報に示される構成では、外的要因により平ベルト
を強制的に受は止めるようにしているから、平ベルトと
ローラ部材との組合わせの条件如何により機構として成
立し得ない場合がある。即ち、平ベルトの寄り力が大き
くなるほどガイド及び規制部祠の強度を増大させる必要
がある。また、平ベルト自体の幅方向座屈強度を増大さ
せる必要があり、同時に平ベルト端部が損傷しないよう
に端部強度をも増大させる必要かある。従って、ベルト
厚さか薄くなるほど上記方式の採用は困難となる。また
、平ベルトにガイドを設ける場合に、精度良くガイドを
設ける必要があり、特にシームレスベルトの場合では、
このガイドを形成すること自体が非常に困難であった。(Problem to be solved by the invention) However, JP-A-56-127501, JP-A-59-205052 and JP-A-57-6034
In the configuration shown in Publication No. 7, the flat belt is forced to stop receiving due to external factors, so it may not be possible to establish the mechanism depending on the conditions of the combination of the flat belt and the roller member. . That is, as the shifting force of the flat belt increases, it is necessary to increase the strength of the guide and the regulating portion. Further, it is necessary to increase the buckling strength in the width direction of the flat belt itself, and at the same time, it is also necessary to increase the strength of the end portions of the flat belt so that the end portions are not damaged. Therefore, the thinner the belt becomes, the more difficult it becomes to employ the above method. In addition, when installing a guide on a flat belt, it is necessary to provide the guide with high precision, especially in the case of a seamless belt.
Creating this guide itself was extremely difficult.
また、実開昭５８−１１０６０９号公報、実開昭６４−
４８４５７号公報に示されるものでは、複雑なメカニズ
ムを用いて蛇行を修正するために、高価でしかも余分な
スペースを必要とし、装置全体としての大型化に繋るば
かりでなく、複雑な機構で部品点数が多く、それだけ故
障発生要因部が増加することになり、装置の信頼性が十
分に確保されているとは言い難いものであった。Also, Utility Model Application Publication No. 58-110609, Utility Model Application No. 64-
The method disclosed in Japanese Patent No. 48457 uses a complicated mechanism to correct the meandering, which is expensive and requires extra space, which not only leads to an increase in the size of the device as a whole, but also requires a complicated mechanism to correct the meandering. As the number of points is large, the number of failure-causing factors increases accordingly, and it is difficult to say that the reliability of the device is sufficiently ensured.
本発明は、ローラ部材及び平ベルトに複雑な加工を施す
ことなく、簡単な機構で必要スペースが小さく、安価に
ベルトの蛇行を防止することかできるベルト駆動装置を
提供することを目的としている。An object of the present invention is to provide a belt drive device that uses a simple mechanism, requires small space, and can prevent belt meandering at low cost without performing complicated processing on roller members and flat belts.
（課題を解決するための手段）
上記の目的を達成するために、本発明では、平ベルトに
蛇行が発生すると、この平ベルトの走行運動力によって
ローラ部材の軸端部を所定方向に変位させて逆方向の蛇
行成分を発生させるようにした。(Means for Solving the Problem) In order to achieve the above object, the present invention displaces the shaft end of the roller member in a predetermined direction by the running motion force of the flat belt when meandering occurs in the flat belt. Now, a meandering component in the opposite direction is generated.
具体的に、請求項（１）記載の発明は、ペルー・駆動装
置として、平ペルー・と、該平ベルトが掛け渡され、且
つ各々軸により回転可能に支持され、少なくとも１本が
蛇行検出用ローラ部材に構成された３本以上のローラ部
材と、前記蛇行検出用ローラ部材の少なくとも一方の軸
端部に、該蛇行検出用ローラ部材と独立して回転自在に
支持された蛇行検出部材と、前記蛇行検出用ローラ部材
の前記蛇行検出部材が配設された軸端部を回転軸心と直
行する所定方向に移動可能に支持するローラ支持部材と
、前記蛇行検出部材に連結され、蛇行検出部材に平ベル
トが接して回転トルクが作用したときに、その回転運動
を直線運動に変換することによって、蛇行検出用ローラ
部材の軸端部を所定方向に変位させるローラ端部変位手
段とを設けるものとする。Specifically, the invention as set forth in claim (1) provides a belt driving device in which the flat belt is stretched over a flat belt, each of which is rotatably supported by a shaft, and at least one belt is for meandering detection. three or more roller members configured as a roller member; a meandering detection member rotatably supported by at least one shaft end of the meandering detection roller member, independently of the meandering detection roller member; a roller support member that supports a shaft end portion of the meandering detection roller member on which the meandering detection member is disposed so as to be movable in a predetermined direction perpendicular to the rotational axis; and a meandering detection member that is connected to the meandering detection member. roller end displacement means for displacing the shaft end of the meandering detection roller member in a predetermined direction by converting the rotational motion into linear motion when the flat belt contacts and a rotational torque is applied to the roller member. shall be.
そして、前記蛇行検出用ローラ部オ」を、隣接する一対
のローラ部材との間のベルト張力の合成ベクトルが上記
ローラ端部変位手段による軸端部の変位方向に対して逆
向きの成分を持つように配置したも′のである。The meandering detection roller part O' is arranged such that a composite vector of belt tension between the pair of adjacent roller members has a component opposite to the direction in which the shaft end is displaced by the roller end displacement means. It is also arranged like this.
請求項（２）の発明は、前記請求項（１）の発明におけ
るローラ端部変位手段として、蛇行検出用ローラ部材を
隣接する一対のローラ部材の軸間の方向よりも外側に傾
いた方向に変位させるもので構成したものである。The invention according to claim (2) is characterized in that, as the roller end displacement means in the invention according to claim (1), the meandering detection roller member is tilted outward from the direction between the axes of a pair of adjacent roller members. It is made up of things that can be displaced.
（作用）
以上の構成により、請求項（１）の発明では、平ベルト
が蛇行により変位して蛇行検出部材に接すると、該蛇行
検出部材が平ベルトとの接触摩擦により回転し、ローラ
端部変位手段によってこの蛇行検出部材の回転運動が直
線運動に変換される。これによって、蛇行検出用ローラ
部材の一方の軸端部が所定方向に変位する。このように
して蛇行検出ローラ部材の一端部が変位すると、平ベル
トに逆方向の蛇行変位が発生し、前記初期の蛇行を解消
する。このことで、初期の蛇行変位量に対応した蛇行検
出用ローラ部材の軸端部の変位か自動的に与えられる。(Function) With the above configuration, in the invention of claim (1), when the flat belt is displaced due to meandering and comes into contact with the meandering detection member, the meandering detection member is rotated by the contact friction with the flat belt, and the roller end The rotational movement of the meandering detection member is converted into linear movement by the displacement means. As a result, one shaft end of the meandering detection roller member is displaced in a predetermined direction. When one end of the meandering detection roller member is displaced in this manner, a meandering displacement in the opposite direction occurs in the flat belt, thereby eliminating the initial meandering. As a result, the displacement of the shaft end of the meandering detection roller member corresponding to the initial meandering displacement amount is automatically given.
その場合、前記蛇行検出用ローラ部材の軸端部の変位に
対し、蛇行検出用ローラ部材と隣接する一対のローラ部
材との間のベルト張力の合成ベクＩ・ルか逆向きのトｊ
勢力として作用しているので、ローラ端部変位手段によ
る変位力と合成ベクＩ・ルによる逆向きの（＝１勢力と
のバランスにより、蛇行検出用ローラ部材の変位量が規
制され、ある一定位置にベルトの端部の位置が維持され
る。したがって、スプリング等の付勢手段を別途設ける
ことなく、安定した走行が行オ）れることになる。In that case, with respect to the displacement of the shaft end of the meandering detection roller member, the resultant vector I of the belt tension between the meandering detection roller member and the pair of adjacent roller members or the opposite direction torque
Since it acts as a force, the amount of displacement of the meandering detection roller member is regulated by the balance between the displacement force by the roller end displacement means and the opposite (=1 force) by the composite vector I The position of the end of the belt is maintained at the same time.Therefore, stable running can be achieved without the need for additional biasing means such as a spring.
請求項（２）の発明では、ローラ端部変位手段による蛇
行検出用ローラ部材の軸部材の変位方向か、隣接する一
対のローラ部月の軸間を結ぶ方向に対して所定角度だけ
外側に傾いているので、ベルト張力の合成ベクトルのロ
ーラ変位方向とは逆向きの成分が増大し、蛇行検出用ロ
ーラ部材の軸部材の軸端部の変位量がさらに小さく抑制
されて、ベルトの走行性が安定することになる。In the invention of claim (2), the shaft member of the meandering detection roller member is tilted outward by a predetermined angle with respect to the displacement direction of the shaft member of the meandering detection roller member by the roller end displacement means or the direction connecting the shafts of a pair of adjacent roller parts. As a result, the component of the belt tension composite vector in the direction opposite to the roller displacement direction increases, and the amount of displacement of the shaft end of the shaft member of the meandering detection roller member is further suppressed, thereby improving the running performance of the belt. It will become stable.
（実施例）
以下、本発明の第１実施例について、第１図〜第５図に
基づき説明する。(Example) Hereinafter, a first example of the present invention will be described based on FIGS. 1 to 5.
第１図は、本発明による電子写真装置内に収容された平
ベルト駆動装置を示し、３輔系の感光体ベルトの駆動装
置である。図中、１．．２．３は、夫々第１、第２及び
第３０−ラ部祠であって、夫々軸部材１ａ、２ａ、３ａ
と、該軸部材１ａ、２ａ＋３ａの左右両端部を除いた部
分で、軸部材１ａ、 ２ａ、３ａと同心上で僅かに大
径に形成されだ円筒部祠１ｂ、２ｂ、３ｂとから成って
いる。FIG. 1 shows a flat belt drive device housed in an electrophotographic apparatus according to the present invention, which is a three-piece photoreceptor belt drive device. In the figure, 1. ．． 2.3 are the first, second, and 30th-ra part shrines, respectively, with shaft members 1a, 2a, and 3a, respectively;
and cylindrical portions 1b, 2b, and 3b, which are formed concentrically with the shaft members 1a, 2a, and 3a, and have a slightly larger diameter, excluding the left and right ends of the shaft members 1a, 2a, and 3a. .
この円筒部＋４’ｌｂ、２ｂ、３ｂの材料としては、例
えばＥＰＤＭ系架橋ゴム等の弾性体が採用される。ただ
し、必ずしも弾性体でなくてもよい。As the material for the cylindrical portions +4'lb, 2b, and 3b, an elastic body such as EPDM crosslinked rubber is used, for example. However, it does not necessarily have to be an elastic body.
また、前記各ローラ部材１．，２．３には、基材の表面
に感光体層が形成されてなる本発明でいう平ベルトとし
ての感光体ベルト４が走行可能に掛け渡されており、こ
の感光体ベルト４が電子写真装置の感光体として機能す
るようになっている。Further, each of the roller members 1. , 2.3, a photoreceptor belt 4, which is a flat belt in the present invention and has a photoreceptor layer formed on the surface of a base material, is runnably stretched over the photoreceptor belt 4. It is designed to function as the photoreceptor of the device.
また、前記感光体ベルト４の基材としては、例えば２軸
延伸ポリエステルが採用されており、引張弾性率が２０
０ｋｇ／ｍｍ’以上に設定されている。Further, as the base material of the photoreceptor belt 4, for example, biaxially oriented polyester is used, and the tensile modulus is 20.
It is set to 0 kg/mm' or more.
第１０−ラ部利１は、軸部材１ａが駆動モータ５の駆動
軸に連結されて該駆動モータ５の駆動力が伝達可能とな
っており、所謂駆動ローラとして機能するようになって
いる。The 10th L section 1 has a shaft member 1a connected to a drive shaft of a drive motor 5 so that the driving force of the drive motor 5 can be transmitted, and functions as a so-called drive roller.
第２０−ラ部材２は、所謂従動ローラで、その軸線が第
１０−ラ部材１の軸線に対して傾斜配置されている。例
えば軸部材２ａのＡ方向側軸端部のみを、第１０−ラ部
祠１との水平平行位置に対して、Ｃ方向に僅かに（例え
ば１ｍ）変位させている。The 20th L member 2 is a so-called driven roller, and its axis is inclined with respect to the axis of the 10th L member 1. For example, only the shaft end on the A direction side of the shaft member 2a is slightly displaced (for example, 1 m) in the C direction with respect to the horizontally parallel position with the 10th R-shape shrine 1.
第３０−ラ部材３は、本発明でいう蛇行検出用ローラ部
材であって、その軸線が第１０−ラ部拐１の軸線と略平
行に配置されている。また、第３０−ラ部祠３は、その
左右両軸端部に配設されたスプリング３ｃ、３ｃによっ
てＣ方向に付勢力が与えられており、このイ」勢力によ
って感光体ベルト４の張力を調整するようになっている
。The 30th radial member 3 is a meandering detection roller member according to the present invention, and its axis is arranged substantially parallel to the axis of the 10th radial member 1. Further, the 30th A part shrine 3 is given a biasing force in the C direction by springs 3c, 3c disposed at both left and right shaft ends, and this A' force reduces the tension of the photoreceptor belt 4. It is supposed to be adjusted.
このように各ローラ部４１．２．３が配設されているこ
とにより、この各ローラ部材１．２．３に掛け渡されて
いる感光体ベルト４は、常にＡ方向に蛇行するような構
成となっている。By arranging each roller part 41.2.3 in this way, the photoreceptor belt 4 that is stretched around each roller member 1.2.3 is configured to always meander in the A direction. It becomes.
また、第３０−ラ部材３の軸部材３ａの軸端部は、第２
図及び第３図に示すように、軸受部材であるブツシュ７
を介して下枠８ａに回転可能に支承され、該下枠８ａが
スライドベアリング９を介して可動部材６に取付固定さ
れた上枠８ｂに第１０−ラ部材１の軸端部に対Ｉ７て接
近及び離隔可能となるように係合しており、この下枠８
ａ、上枠８ｂ及びスライドベアリング９によって本発明
でいうローラ支持部材８が構成されている。第３０−ラ
部材３の軸部材３ａの下枠８ａの取付位置より内側位置
では蛇行検出部材１１が第３０−ラ部材３と同軸上でか
つ該第３０−ラ部材３から独立して回動自在に配設され
ている。Further, the shaft end portion of the shaft member 3a of the 30th member 3 is connected to the second
As shown in the figure and FIG. 3, a bushing 7 which is a bearing member
The lower frame 8a is rotatably supported by the lower frame 8a through a slide bearing 9, and the upper frame 8b is fixedly attached to the movable member 6 via a slide bearing 9. They are engaged so that they can approach and separate, and this lower frame 8
a, the upper frame 8b, and the slide bearing 9 constitute the roller support member 8 referred to in the present invention. At a position inside the attachment position of the lower frame 8a of the shaft member 3a of the 30th-R member 3, the meandering detection member 11 rotates coaxially with the 30th-R member 3 and independently from the 30th-R member 3. It is freely arranged.
前記蛇行検出部材１１は、円筒部材３ｂ側外径は円筒部
材３ｂ外径と同じか、やや小さいが、端面から離れるに
従って径が大きくなるテーパ部１１ａを有し、感光体ベ
ルト４に蛇行が発生すると、その蛇行変位により感光体
ベルト４が蛇行検出部材１１に乗り上げるようになって
いる。The meandering detection member 11 has a tapered portion 11a whose outer diameter on the side of the cylindrical member 3b is the same as or slightly smaller than the outer diameter of the cylindrical member 3b, but whose diameter increases as it moves away from the end face, and meandering occurs in the photoreceptor belt 4. Then, the photoreceptor belt 4 rides on the meandering detection member 11 due to the meandering displacement.
この蛇行検出部材１１の材質としては、ポリアセタール
樹脂等が使用される。As the material of this meandering detection member 11, polyacetal resin or the like is used.
また、蛇行検出部材１１には、一端部が固定部祠Ｓに取
ｆ・１固定された巻取部利としての紐部材１３の他端部
が連結され、感光ベルト４の蛇行変位により、感光ベル
ト４が蛇行検出部材１１上に乗り上げ、蛇行検出部材１
１に回転トルクが作用したとき、蛇行検出部材１１の回
転により前記紐部材１３が蛇行検出部材１１に巻き取ら
れて、前記第３０−ラ部材３の軸部材３ａの軸端部を第
１図Ｂ方向に変位させる。つまり、第３０−ラ部材３を
ベルト進行方向に向かって右方に傾動させることにより
、感光体ベルト４を第３０−ラ部材３の周方向に沿って
巻回するよう右方（図中Ａ方向とは逆方向）に移動させ
るようになされている。これによって、蛇行検出部材１
１に回転トルクが作用したときに前記軸部＋４３ ａの
軸端部を所定方向に変位させるローラ端部変位手段１４
が構成されている。即ち、軸部材３ａの軸端部かＢ方向
に変位されると、感光体ベルト４にはＡ方向とは逆方向
への蛇行成分が発生し、初期の蛇行成分（Ａ方向成分）
と打ち消し合うまで軸部材３ａの軸端部は変位されるこ
とになる。The meandering detection member 11 is connected to the other end of a string member 13, which serves as a winding part, and whose one end is fixed to the fixing part shrine S. The belt 4 rides on the meandering detection member 11 and the meandering detection member 1
1, the string member 13 is wound around the meandering detection member 11 due to the rotation of the meandering detection member 11, and the shaft end of the shaft member 3a of the 30th member 3 is rotated as shown in FIG. Displace it in the B direction. In other words, by tilting the 30th L member 3 to the right in the belt traveling direction, the photoreceptor belt 4 is wound to the right (A in the figure) so as to be wound along the circumferential direction of the 30th L member 3. (in the opposite direction). As a result, the meandering detection member 1
roller end displacement means 14 for displacing the shaft end of the shaft portion +43a in a predetermined direction when rotational torque is applied to the shaft portion 1;
is configured. That is, when the shaft end of the shaft member 3a is displaced in the B direction, a meandering component in the direction opposite to the A direction is generated in the photoreceptor belt 4, and the initial meandering component (A direction component)
The shaft end portion of the shaft member 3a will be displaced until the values cancel each other out.
ここで、第４図に示すように、第１〜第３０−ラ部材１
〜３の位置関係は、第３０−ラ部材３が第１０−ラ部祠
１−第２０−ラ部材２間の中間位置よりも第２０−ラ部
材２側になるように、つまり、第１．第２０−ラ部材１
，２の各軸を結ぶ線Ｘ上において、第３０−ラ３の軸中
心を通り線Ｘに直交する線の線Ｘとの交点をＰとし、該
点Ｐと第１．第２０−ラ部材１，２の軸心との距離をそ
れぞれΩ１．Ω２とすると、
ρ１ 〉ｇ２
となるようになされている。Here, as shown in FIG.
- 3 is such that the 30th La member 3 is closer to the 20th La member 2 than the intermediate position between the 10th La part shrine 1 and the 20th La member 2, that is, the 1st La member 3 ．． 20th-ra member 1
, 2, the intersection of a line passing through the center of the axis of the 30th-ra 3 and orthogonal to the line X with the line X is defined as P, and the point P and the 1st. The distance from the axis of the 20th-ra members 1 and 2 is Ω1. When Ω2 is assumed, ρ1 > g2.
そして、このような位置関係から、第３０−ラ部材３に
おいて感光体ベルト４と第１０−ラ部祠１との間の張力
Ｔ１と、感光体ベルト４と第２０−ラ部材２との間の張
力Ｔ２との合成ベクトルＦが、上記紐部材１３による第
３０−ラ部祠３の変位方向Ｂに対して逆向きとなる成分
子ｘを有することになる。すなわち、第３０−ラ部祠３
に対して紐部材１３による変位方向とは逆向きに付勢す
ることにより、軸部材３ａの軸端部の所定量以上の変位
を抑制するようになされている。From this positional relationship, the tension T1 between the photoreceptor belt 4 and the 10th element 1 in the 30th element 3 and the tension T1 between the photoreceptor belt 4 and the 20th element 2 The resultant vector F with the tension T2 has a component element x that is in the opposite direction to the displacement direction B of the 30th round part shrine 3 by the string member 13. In other words, the 30th Rabe Shrine 3
By biasing the shaft end portion of the shaft member 3a in a direction opposite to the direction of displacement by the string member 13, displacement of the shaft end portion of the shaft member 3a by a predetermined amount or more is suppressed.
以上の構成により、軸部材３ａの軸端部の変位による逆
方向の蛇行成分が初期蛇行成分より大きくなると、感光
体ベルト４は逆方向に蛇行を開始し、蛇行検出部材１１
への乗り上げ量は減少するから、蛇行検出部材１１の回
転トルクも減少し、その結果、ベルト張力の合成ベクト
ルＦの付勢力によって軸部材３ａの軸端部の変位量も小
さくなるようになっている。With the above configuration, when the meandering component in the opposite direction due to the displacement of the shaft end of the shaft member 3a becomes larger than the initial meandering component, the photoreceptor belt 4 starts meandering in the opposite direction, and the meandering detection member 11
Since the amount of riding on the belt decreases, the rotational torque of the meandering detection member 11 also decreases, and as a result, the amount of displacement of the shaft end of the shaft member 3a also decreases due to the urging force of the composite vector F of the belt tension. There is.
なお、蛇行検出部材１１のローラ端部外側への移動はス
トッパ１６によって規制されている。Note that the movement of the meandering detection member 11 toward the outside of the roller end is regulated by a stopper 16 .
上記のように構成すれば、第１及び第３０−ラ部祠１．
３に対する第２０−ラ部材２の傾斜配置により、感光ベ
ルト４には常にＡ方向へ変位するように力が作用する。If configured as described above, the first and 30th-ra part shrines 1.
Due to the inclined arrangement of the 20th ring member 2 relative to the photoreceptor belt 3, a force always acts on the photoreceptor belt 4 so as to displace it in the A direction.
【７かして、感光ベルト４の変位により感光ベルト４の
端部が蛇行検出部材１１のテーパ部１１ａに乗り上げる
と、第５図に示すように、感光ベルト４と蛇行検出部材
１１との間に作用する摩擦力により、蛇行検出部材１１
が軸部ｔｉｊＩ３ ａに対して回転せしめられ、その回
転によって紐部材１３を巻取ることになる。[7] When the end of the photosensitive belt 4 rides on the tapered part 11a of the meandering detection member 11 due to the displacement of the photosensitive belt 4, as shown in FIG. Due to the frictional force acting on the meandering detection member 11
is rotated with respect to the shaft portion tijI3a, and the string member 13 is wound up by the rotation.
この紐部材１３の巻取りにより、蛇行検出部材１１が配
置されている第３０−ラ部材３の端部である軸部材３ａ
の軸端部が変位し、その変位により感光体ベルト４の入
方向の変位が制御される。By winding up the string member 13, the shaft member 3a, which is the end of the 30th-ra member 3 on which the meandering detection member 11 is disposed.
The shaft end portion of the photoreceptor belt 4 is displaced, and the displacement of the photoreceptor belt 4 in the entrance direction is controlled by the displacement.
それと共に、前記軸端部の変位に対し、第３０−ラ部材
３と第１．第２０−ラ部材１，２との間のベルト張力Ｔ
Ｉ、Ｔ！の合成ベクトルＦが逆向きの付勢力として作用
しているので、紐部材１３の巻取り力と合成ベクトルＦ
の付勢力とのバランスにより、第３０−ラ部材３の変位
量が規制され、ある一定位置に感光体ベルト４の端部の
位置が維持される。すなわち、感光体ベルト４の走行を
安定させることができ、例えば感光体ベルト４の蛇行量
を１０数μｍに抑えることができる。At the same time, with respect to the displacement of the shaft end, the 30th-ra member 3 and the 1st. Belt tension T between the 20th-ra members 1 and 2
I, T! Since the resultant vector F acts as a biasing force in the opposite direction, the winding force of the string member 13 and the resultant vector F
Due to the balance with the urging force of , the amount of displacement of the 30th member 3 is regulated, and the position of the end of the photoreceptor belt 4 is maintained at a certain constant position. That is, the running of the photoreceptor belt 4 can be stabilized, and for example, the amount of meandering of the photoreceptor belt 4 can be suppressed to about 10 μm.
ここで、上記のような紐部材１３の巻取力に対して逆向
きの付勢力を与えるには、例えばスプリング等を設けて
もよいが、そうすると、スプリングや軸部ｉＭ’ ３
ａとスプリングとを接続するブツシュが別途必要となる
。それに対して、本発明では、部品の低減を図ることが
できる利点がある。Here, in order to apply a biasing force in the opposite direction to the winding force of the string member 13 as described above, for example, a spring or the like may be provided.
A separate bushing is required to connect a and the spring. In contrast, the present invention has the advantage of being able to reduce the number of parts.
なお、本実施例では、ローラ端部変位手段１４において
巻取部材１３として紐部材を用いているが、第６図に示
すように、紐部材１３を用いることなく、リング部材２
１の外周面にアウタギヤを形成し、ラックギヤ２２との
噛合により軸端部を変位させるようにしてもよい。更に
、第７図に示すように、リング部材３１の外周面の摩擦
係数を高め、摩擦板３２との摩擦作用を利用することも
できる。更には、第８図に示すように、蛇行検出部材１
１の回動の中心より離れた位置に連結され、他端が第３
０−ラ部材３とは独立に連結された剛性のあるロッド１
７により構成するようにしてもよい。In this embodiment, a string member is used as the winding member 13 in the roller end displacement means 14, but as shown in FIG.
An outer gear may be formed on the outer peripheral surface of the rack gear 1, and the shaft end may be displaced by meshing with the rack gear 22. Furthermore, as shown in FIG. 7, it is also possible to increase the friction coefficient of the outer peripheral surface of the ring member 31 and utilize the frictional effect with the friction plate 32. Furthermore, as shown in FIG.
The other end is connected at a position away from the center of rotation of the third
A rigid rod 1 connected independently of the 0-ra member 3
7 may be used.
また、蛇行検出部材１１にテーパ部１１ａを形成するこ
とは、ベルトの回転によるトルクを蛇行検出部材１１に
確実に伝達できるようにするために望ましいが、このテ
ーパ部１１ａは必ずしも必要ではなく、テーパ部１１ａ
を設けることなく、円筒部材３ｂと同径の部材としても
よい。Furthermore, it is desirable to form the tapered portion 11a on the meandering detection member 11 in order to ensure that the torque due to the rotation of the belt can be transmitted to the meandering detection member 11, but this tapered portion 11a is not necessarily necessary. Part 11a
It is also possible to use a member having the same diameter as the cylindrical member 3b without providing the cylindrical member 3b.
さらに、上記実施例では３本のローラ部材１〜３を有す
る３軸系の感光ベルトの駆動装置について説明したが、
第９図に示すような第１〜第４０う部材Ｒ１〜Ｒ４を有
する４軸系以上の装置についても、上記第４図と比較す
れば明らかなように、蛇行検出用ローラとなる第３０−
ラ部祠Ｒ３と隣接する一対のローラ部材（第１．第２０
−ラ部材）Ｒ１，Ｒ２との間のベルト張力Ｔ１．Ｔ２の
合成ベクトルＦが紐部材１３による軸部材３ａの変位方
向Ｂと逆向きの成分を有していれば、上記３軸系とまっ
たく同様に考えることができる。Furthermore, in the above embodiment, a three-axis photosensitive belt drive device having three roller members 1 to 3 was described.
As shown in FIG. 9, the 30th to 40th rollers, which serve as meandering detection rollers, are also used for devices with 4 or more shafts having the 1st to 40th members R1 to R4, as is clear from the comparison with FIG. 4 above.
A pair of roller members (1st and 20th
- belt tension T1 between R1 and R2 (R member) R1. If the resultant vector F of T2 has a component in the direction opposite to the displacement direction B of the shaft member 3a by the string member 13, it can be considered in exactly the same way as the above three-axis system.
次に、請求項（２）の発明に係る第２実施例について説
明する。Next, a second embodiment according to the invention of claim (2) will be described.
第１０図は、第２実施例におけるローラ部材１〜３の配
置とローラ端部変位手段１４による第３０−ラ部材３の
軸部４４３ ａの変位方向との関係を示し、本実施例で
は、ローラ端部変位手段１４による第３０−ラ部材３の
軸部材３ａの軸端部の変位方向が、第１．第２０−ラ部
祠１，２の軸間を結ぶ方向つまり上記第１実施例におけ
るＢ方向（図中−点鎖線で示す方向）に対して、所定角
度αだけ外側に傾くように（図中二点鎖線で示す方向）
なされている。つまり、図示しないが、上記第１実施例
におけるスライドベアリング９のスライド面が傾いて取
付けられている。その他の構成は上記第１実施例と同様
である。FIG. 10 shows the relationship between the arrangement of the roller members 1 to 3 and the direction of displacement of the shaft portion 443a of the 30th roller member 3 by the roller end displacement means 14 in the second embodiment. The direction in which the shaft end of the shaft member 3a of the 30th roller member 3 is displaced by the roller end displacement means 14 is the first direction. 20th - Ra part The shrine is tilted outward by a predetermined angle α (in the figure) with respect to the direction connecting the axes of the shrines 1 and 2, that is, the B direction in the first embodiment (the direction indicated by the dotted chain line in the figure). direction shown by the two-dot chain line)
being done. That is, although not shown, the sliding surface of the slide bearing 9 in the first embodiment is installed with an inclination. The other configurations are the same as those of the first embodiment.
したがって、本実施例では、ローラ端部変位手段１４に
よる第３０−ラ部材３の輔部材３ａの変位方向が、第１
．第２０−ラ部十１１，２の軸間を結ぶ方向に対して所
定角度αだけ外側に傾いているので、第３０−ラ部材３
と第１．第２０−ラ部材１，２との間のベルト張力の合
成ベクトルＦのローラ変位方向とは逆向きの成分子ｘ’
が、上記第１実施例における値（Ｂ方向成分子ｘ）に
比べて増大し、ローラ端部変位手段１４による第３０−
ラ部祠３の軸部材３ａの軸端部の変位に抗する付勢力が
増大する。よって、軸部材３ａの軸端部の変位量を小さ
く抑制することができ、蛇行防止機能がより向上するこ
とになる。Therefore, in this embodiment, the displacement direction of the support member 3a of the 30th roller member 3 by the roller end displacement means 14 is the first direction.
．． Since it is tilted outward by a predetermined angle α with respect to the direction connecting the axes of the 20th radial part 111 and 2, the 30th radial member 3
and 1st. Component element x' in the opposite direction to the roller displacement direction of the composite vector F of the belt tension between the 20th and R members 1 and 2
is increased compared to the value (B direction component x) in the first embodiment, and the 30th -
The urging force that resists the displacement of the shaft end of the shaft member 3a of the lap shrine 3 increases. Therefore, the amount of displacement of the shaft end portion of the shaft member 3a can be suppressed to a small value, and the meandering prevention function is further improved.
なお、上記各実施例では、ローラ支持部月８をスライド
ベアリング９を利用した構造としたが、本発明のローラ
支持部材８は蛇行検出用ローラ部材（第３０−ラ部材３
）を所定方向に移動させる機能を有すれば足り、例えば
第３０−ラ部材３の軸部材３８の軸端部を挿通ずる長孔
を紐部材１３が巻取られる際に前記軸部材３ａの軸端部
が移動する方向に向って延設することによりスライドベ
アリングなどのような機構を使用することなしに、簡単
な構成で軸部材３ａを移動自在に支持するようにしても
よく、さらには、長孔を直線状ではなく、湾曲状として
もよい。In each of the above embodiments, the roller support member 8 has a structure using the slide bearing 9, but the roller support member 8 of the present invention has a meandering detection roller member (the 30th roller member 3).
) in a predetermined direction. For example, when the string member 13 is wound through a long hole through which the shaft end of the shaft member 38 of the 30th member 3 is wound, the shaft of the shaft member 3a By extending in the direction in which the end portion moves, the shaft member 3a may be movably supported with a simple structure without using a mechanism such as a slide bearing. The elongated hole may be curved instead of straight.
尚、上述した実施例では、電子写真装置の感光ベルト駆
動装置に適用した例について説明しているが、本発明は
これに限るものではなく、転写搬送装置の駆動装置、或
いは通常の平ベルト駆動装置に対しても同様に適用する
ことができる。In the above-mentioned embodiments, an example is explained in which the application is applied to a photosensitive belt drive device of an electrophotographic apparatus, but the present invention is not limited to this, and can be applied to a drive device of a transfer conveyance device or a normal flat belt drive. The same can be applied to devices.
１つ
（発明の効果）
上述したように、請求項（１）の発明によれば、３本以
上のローラ部材に平ベルトを巻回してなるベルト駆動装
置において、平ベルトが蛇行変位により、蛇行検出部祠
に接して蛇行検出部祠が回転すると、この蛇行検出部）
」の回転運動をローラ端部変位手段によって直線運動に
変換して蛇行検出用ローラ部材の一方の軸端部を所定方
向に変位させ、平ベルトに逆方向の蛇行変位を発生させ
て、初期の蛇行を解消するとともに、蛇行検出用ローラ
部材を、隣接する一対のローラ部材との間のベルＩ・張
力の合成ベクトルが蛇行検出用ローラ部材の軸端部の変
位方向成分を持つように配置したことで、初期の蛇行に
応じた蛇行検出用ローラ部祠の軸端部の変位量が自動的
に与えられ、平ベルトは蛇行が解消されるため、安定し
た走行を行わせることができるとともに、別途スプリン
グ等の部材を設ける必要がなく、よって、コストの低減
と装置の小形化とを図ることができる。One (Effect of the Invention) As described above, according to the invention of claim (1), in a belt drive device in which a flat belt is wound around three or more roller members, the flat belt is caused to meander by meandering displacement. When the meandering detection part is rotated in contact with the detection part, this meandering detection part)
'' is converted into a linear motion by the roller end displacement means, one shaft end of the meandering detection roller member is displaced in a predetermined direction, the flat belt is caused to meander in the opposite direction, and the initial In addition to eliminating meandering, the meandering detection roller member is arranged so that the composite vector of Bell I tension between a pair of adjacent roller members has a component in the displacement direction of the shaft end of the meandering detection roller member. As a result, the amount of displacement of the shaft end of the meandering detection roller part according to the initial meandering is automatically given, and the meandering of the flat belt is eliminated, making it possible to run stably. There is no need to separately provide a member such as a spring, so it is possible to reduce costs and downsize the device.
請求項（２）の発明によれば、上記請求項（１）の発明
において、蛇行検出用ローラ部材の軸端部の変位方向が
隣接する一対のローラ部材の軸間方向よりも外側に傾く
ように配置したので、蛇行検出用ローラ部材の軸端部の
変位に対する逆向きの付勢力を増大させることができ、
よって、著効を発揮することができる。According to the invention of claim (2), in the invention of claim (1), the displacement direction of the shaft end portion of the meandering detection roller member is inclined outward from the direction between the shafts of the pair of adjacent roller members. , it is possible to increase the biasing force in the opposite direction to the displacement of the shaft end of the meandering detection roller member.
Therefore, it can be highly effective.
第１図〜第５図は本発明の第１実施例を示し、第１図は
ベルト駆動装置の概略斜視図、第２図は蛇行検出部祠周
辺の縦断正面図、第３図はその内側から見た斜視図、第
４図は３本のローラ部材の位置関係を概略的に示す図、
第５図はローラ端部変位手段の動作を説明するための図
、第６図〜第８図は夫々ローラ端部変位手段の変形例を
示す第５図相当図、第９図は第１実施例の変形例に係る
４輔系ベルト駆動装置の上記第４図相当図、第１０図は
第２実施例におけるローラ部材の位置関係を概略的に示
す図である。
１ 第］ローラ部材
２ 第２０−ラ部材
第３０−ラ部材
（蛇行検出用ローラ部材）
感光体ベルト
（平ベルト）
］１ 蛇行検出部材
１４ ローラ端部変位手段1 to 5 show a first embodiment of the present invention, FIG. 1 is a schematic perspective view of the belt drive device, FIG. 2 is a longitudinal sectional front view of the vicinity of the meandering detection part shrine, and FIG. 3 is the inside thereof. FIG. 4 is a diagram schematically showing the positional relationship of the three roller members;
FIG. 5 is a diagram for explaining the operation of the roller end displacement means, FIGS. 6 to 8 are views corresponding to FIG. 5 showing modified examples of the roller end displacement means, and FIG. 9 is the first embodiment. A diagram corresponding to FIG. 4 and FIG. 10 of a four-piece belt drive device according to a modification of the example are diagrams schematically showing the positional relationship of the roller members in the second embodiment. 1] Roller member 2 20th R member 30th R member (meandering detection roller member) Photoreceptor belt (flat belt) ] 1 Meandering detection member 14 Roller end displacement means
Claims (2)
ローラ部材に構成された３本以上のローラ部材と、 前記蛇行検出用ローラ部材の少なくとも一方の軸端部に
、該蛇行検出用ローラ部材と独立して回転自在に支持さ
れた蛇行検出部材と、 前記蛇行検出用ローラ部材の前記蛇行検出部材が配設さ
れた軸端部を回転軸心と直行する所定方向に移動可能に
支持するローラ支持部材と、前記蛇行検出部材に連結さ
れ、蛇行検出部材に平ベルトが接して回転トルクが作用
したときに、その回転運動を直線運動に変換することに
よって、蛇行検出用ローラ部材の軸端部を所定方向に変
位させるローラ端部変位手段とを備えるとともに、 前記蛇行検出用ローラ部材は、隣接する一対のローラ部
材との間のベルト張力の合成ベクトルが上記ローラ端部
変位手段による軸端部の変位方向に対して逆向きの成分
を持つように配置されていることを特徴とするベルト駆
動装置。(1) A flat belt, three or more roller members around which the flat belt is stretched, at least one of which is configured as a meandering detection roller member, and at least one shaft end of the meandering detection roller member. , a meandering detection member rotatably supported independently of the meandering detection roller member; and a shaft end portion of the meandering detection roller member on which the meandering detection member is disposed in a predetermined direction perpendicular to the rotation axis. A roller support member movably supported by the belt is connected to the meandering detection member, and when a flat belt contacts the meandering detection member and rotational torque is applied, the rotational motion is converted into linear motion, thereby detecting meandering. roller end displacement means for displacing the shaft end of the roller member for meandering in a predetermined direction; A belt drive device characterized in that the belt drive device is arranged so as to have a component in the opposite direction to the direction of displacement of the shaft end by the portion displacement means.
、隣接する一対のローラ部材の軸間の方向よりも外側に
傾いた方向に変位させるものである請求項（１）記載の
ベルト駆動装置。(2) The belt drive according to claim 1, wherein the roller end displacement means displaces the meandering detection roller member in a direction inclined outward from a direction between the axes of a pair of adjacent roller members. Device.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2258497A JP2641609B2 (en) | 1990-09-25 | 1990-09-25 | Belt drive |
| EP91108174A EP0458260B1 (en) | 1990-05-24 | 1991-05-21 | Belt driving system |
| DE69121466T DE69121466T2 (en) | 1990-05-24 | 1991-05-21 | Belt drive system |
| AT91108174T ATE141697T1 (en) | 1990-05-24 | 1991-05-21 | BELT DRIVE SYSTEM |
| US07/705,421 US5181888A (en) | 1990-05-24 | 1991-05-24 | Belt driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2258497A JP2641609B2 (en) | 1990-09-25 | 1990-09-25 | Belt drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04133928A true JPH04133928A (en) | 1992-05-07 |
| JP2641609B2 JP2641609B2 (en) | 1997-08-20 |
Family
ID=17321030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2258497A Expired - Fee Related JP2641609B2 (en) | 1990-05-24 | 1990-09-25 | Belt drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2641609B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6085053A (en) * | 1997-11-26 | 2000-07-04 | Nec Corporation | Recording device |
| US6938544B2 (en) | 2000-02-09 | 2005-09-06 | Heidelberger Druckmaschinen Ag | Belt drive |
| JP2014228854A (en) * | 2013-05-27 | 2014-12-08 | 京セラドキュメントソリューションズ株式会社 | Drive transmission device and image formation device |
| JP2015191075A (en) * | 2014-03-28 | 2015-11-02 | ブラザー工業株式会社 | Belt conveyance device and image forming apparatus |
-
1990
- 1990-09-25 JP JP2258497A patent/JP2641609B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6085053A (en) * | 1997-11-26 | 2000-07-04 | Nec Corporation | Recording device |
| US6938544B2 (en) | 2000-02-09 | 2005-09-06 | Heidelberger Druckmaschinen Ag | Belt drive |
| JP2014228854A (en) * | 2013-05-27 | 2014-12-08 | 京セラドキュメントソリューションズ株式会社 | Drive transmission device and image formation device |
| JP2015191075A (en) * | 2014-03-28 | 2015-11-02 | ブラザー工業株式会社 | Belt conveyance device and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2641609B2 (en) | 1997-08-20 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |