JP4385334B2 - Tension applying device and image forming apparatus - Google Patents

Tension applying device and image forming apparatus Download PDF

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JP4385334B2
JP4385334B2 JP2005330854A JP2005330854A JP4385334B2 JP 4385334 B2 JP4385334 B2 JP 4385334B2 JP 2005330854 A JP2005330854 A JP 2005330854A JP 2005330854 A JP2005330854 A JP 2005330854A JP 4385334 B2 JP4385334 B2 JP 4385334B2
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pulley
support member
slide member
applying device
tension
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JP2007139007A (en
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裕司 寺下
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Murata Machinery Ltd
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Murata Machinery Ltd
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Description

本発明は、駆動伝達ベルトに所定の張力を付与しかつ駆動伝達ベルトの移動をガイドする張力付与装置及びこれを備えた画像形成装置に関する。   The present invention relates to a tension applying device that applies a predetermined tension to a drive transmission belt and guides the movement of the drive transmission belt, and an image forming apparatus including the tension applying device.

従来から画像形成装置などには、駆動伝達ベルトに所定の張力を作用させる張力付与装置が設けられている。ここで、この駆動伝達ベルトに所定の張力を付与させるとともに駆動伝達ベルトを所定の方向に移動させるためには、張力付与装置に、テンショナー部とガイド部の双方を備える必要がある。
特開平６−１４７２８０号公報 特開平１１−１６５９０２号公報 特開２００５−５３６０３号公報 Conventionally, an image forming apparatus or the like is provided with a tension applying device that applies a predetermined tension to the drive transmission belt. Here, in order to apply a predetermined tension to the drive transmission belt and move the drive transmission belt in a predetermined direction, the tension applying device needs to include both a tensioner portion and a guide portion.
JP-A-6-147280 JP-A-11-165902 JP 2005-53603 A

ところで、上記張力付与装置では、例えば、駆動伝達ベルトに張力を作用させるためにバネを取り付けようとするとテンショナー部が複雑化し、張力付与装置が大型化してしまうおそれがある。加えて、張力付与装置にガイド部を付加しようとすると、さらに張力付与装置が複雑かつ大型化してしまうおそれがある。   By the way, in the said tension | tensile_strength provision apparatus, when it is going to attach a spring in order to make tension act on a drive transmission belt, for example, a tensioner part may become complicated and there exists a possibility that a tension | tensile_strength provision apparatus may enlarge. In addition, if the guide portion is added to the tension applying device, the tension applying device may be further complicated and enlarged.

そこで、本発明は、上記事情を考慮し、簡易な構成で駆動伝達ベルトに所定の張力を付与するとともに駆動伝達ベルトを所定の方向に移動させることができる張力付与装置及びこれを備えた画像形成装置を提供することを目的とする。   Therefore, in consideration of the above circumstances, the present invention provides a tension applying device capable of applying a predetermined tension to the drive transmission belt with a simple configuration and moving the drive transmission belt in a predetermined direction, and an image forming apparatus including the tension applying device. An object is to provide an apparatus.

請求項１に記載の発明は、所定の部位に固定されるとともに第１のプーリを回転可能に支持する支持部材と、前記支持部材上に移動可能に配置され第２のプーリを回転可能に支持するスライド部材と、前記スライド部材と前記支持部材との間に配置され、前記スライド部材が前記支持部材に対して位置決めされた状態で前記第１のプーリと前記第２のプーリとの離間距離を変更する方向に前記支持部材及び前記スライド部材に対して弾性力を作用する弾性部材と、を有する張力付与装置であって、前記支持部材には、前記第１のプーリが回転可能に取り付けられる第１の軸部と、切欠溝と、がそれぞれ形成され、前記スライド部材には、前記第２のプーリが回転可能に取り付けられる第２の軸部と、前記第１の軸部が挿通される長孔状のガイド孔と、前記切欠溝に挿入される挿入片と、がそれぞれ形成され、前記スライド部材が前記支持部材に位置決めされた状態では、前記挿入片が前記切欠溝に挿入され、前記ガイド孔に前記第１の軸部が挿通さていることを特徴とする。 The invention according to claim 1 is fixed to a predetermined part and supports the first pulley rotatably, and is movably disposed on the support member and rotatably supports the second pulley. And a separation distance between the first pulley and the second pulley in a state where the slide member is positioned with respect to the support member. An elastic member that exerts an elastic force on the support member and the slide member in a changing direction , wherein the first pulley is rotatably attached to the support member. 1 shaft portion and a notch groove are respectively formed, and a second shaft portion to which the second pulley is rotatably attached to the slide member, and a length through which the first shaft portion is inserted. Perforated guy A hole and an insertion piece to be inserted into the notch groove are formed, and in a state where the slide member is positioned on the support member, the insertion piece is inserted into the notch groove, and the guide hole is inserted into the guide hole. 1 shaft part is inserted, It is characterized by the above-mentioned.

請求項１に記載の発明によれば、第１のプーリと第２のプーリを駆動伝達ベルトの所定の部位に接触させることにより、駆動伝達ベルトに所定の張力を付与することができる。ここで、スライド部材が支持部材に対して位置決めされた状態で第１のプーリと第２のプーリとの離間距離を変更する方向に支持部材及びスライド部材に対して弾性部材から弾性力が作用される。これにより、スライド部材の支持部材に対する位置決めを解除すると、支持部材及びスライド部材に作用する弾性部材の弾性力により、スライド部材が支持部材に対して移動し第１のプーリと第２のプーリとの離間距離を容易に変更することができる。そして、第１のプーリと第２のプーリとの離間距離が所定の距離となったところでスライド部材を支持部材に位置決めすることにより、駆動伝達ベルトに付与する張力を容易に変更することができる。このように、スライド部材を支持部材に対して移動させるだけで、駆動伝達ベルトに付与する張力を容易に調整することができる。この結果、張力付与装置を簡易な構成にすることができる。また、第１のプーリと第２のプーリのうち一方を固定し他方を移動可能にして駆動伝達ベルトに付与する張力を調整しているため、両方のプーリを移動させて駆動伝達ベルトに付与する張力を調整する構成と比較して、第１のプーリと第２のプーリの移動動作を簡易なものにすることができるため、駆動伝達ベルトに付与する張力を安定させることができる。また、駆動伝達ベルトが第１のプーリ又は第２のプーリから外れるなどの不具合を防止することができる。また、スライド部材が支持部材に位置決めされた状態では、挿入片が切欠溝に挿入され、ガイド孔に第１の軸部が挿通さていることにより、スライド部材の支持部材に対する移動方向を一方向にすることができる。これにより、第１のプーリと第２のプーリとの離間距離を正確に調整することができ、駆動伝達ベルトに付与する張力の調整を安定させることができる。 According to the first aspect of the present invention, a predetermined tension can be applied to the drive transmission belt by bringing the first pulley and the second pulley into contact with a predetermined portion of the drive transmission belt. Here, an elastic force is applied from the elastic member to the support member and the slide member in a direction to change the separation distance between the first pulley and the second pulley in a state where the slide member is positioned with respect to the support member. The Accordingly, when the positioning of the slide member with respect to the support member is released, the slide member moves relative to the support member by the elastic force of the elastic member acting on the support member and the slide member, and the first pulley and the second pulley are moved. The separation distance can be easily changed. Then, when the distance between the first pulley and the second pulley reaches a predetermined distance, the tension applied to the drive transmission belt can be easily changed by positioning the slide member on the support member. In this way, the tension applied to the drive transmission belt can be easily adjusted simply by moving the slide member relative to the support member. As a result, the tension applying device can have a simple configuration. Further, since one of the first pulley and the second pulley is fixed and the other is movable and the tension applied to the drive transmission belt is adjusted, both pulleys are moved and applied to the drive transmission belt. Compared with the configuration for adjusting the tension, the movement operation of the first pulley and the second pulley can be simplified, so that the tension applied to the drive transmission belt can be stabilized. Further, it is possible to prevent problems such as the drive transmission belt being detached from the first pulley or the second pulley. When the slide member is positioned on the support member, the insertion piece is inserted into the notch groove, and the first shaft portion is inserted into the guide hole, so that the movement direction of the slide member relative to the support member is unidirectional. can do. Thereby, the separation distance between the first pulley and the second pulley can be accurately adjusted, and the adjustment of the tension applied to the drive transmission belt can be stabilized.

請求項２に記載の発明は、請求項１に記載の張力付与装置において、前記弾性部材からの弾性力の作用方向と、前記ガイド孔の長軸方向と、前記切欠溝の切欠き方向とは、全て同一方向又は略同一方向となるように設定されていることを特徴とする。 According to a second aspect of the present invention, in the tension applying device according to the first aspect, the acting direction of the elastic force from the elastic member, the major axis direction of the guide hole, and the notch direction of the notch groove Are all set in the same direction or substantially in the same direction .

請求項２に記載の発明によれば、弾性部材からの弾性力の作用方向と、ガイド孔の長軸方向と、切欠溝の切欠き方向とが、全て同一方向又は略同一方向となるように設定されていることにより、スライド部材の支持部材に対する移動方向を一方向にすることができる。これにより、第１のプーリと第２のプーリとの離間距離を正確に調整することができ、駆動伝達ベルトに付与する張力の調整を安定させることができる。 According to the second aspect of the present invention, the direction in which the elastic force is applied from the elastic member, the long axis direction of the guide hole, and the notch direction of the notch groove are all in the same direction or substantially the same direction. By setting, the moving direction of the slide member with respect to the support member can be set to one direction. Thereby, the separation distance between the first pulley and the second pulley can be accurately adjusted, and the adjustment of the tension applied to the drive transmission belt can be stabilized.

請求項３に記載の発明は、請求項１又は２に記載の張力付与装置において、前記スライド部材が前記支持部材に位置決めされた状態で前記スライド部材を前記支持部材に固定する固定部材が設けられていることを特徴とする。 According to a third aspect of the present invention, in the tension applying device according to the first or second aspect, a fixing member that fixes the slide member to the support member in a state where the slide member is positioned on the support member is provided. It is characterized by.

請求項３に記載の発明によれば、スライド部材が支持部材に位置決めされた状態でスライド部材を支持部材に固定する固定部材が設けられていることにより、スライド部材の支持部材に対する位置決め状態を維持することができる。 According to the third aspect of the present invention, the positioning of the slide member with respect to the support member is maintained by providing the fixing member that fixes the slide member to the support member while the slide member is positioned on the support member. can do.

請求項４に記載の発明は、請求項１乃至３のいずれか１項に記載の張力付与装置を備えた画像形成装置である。 A fourth aspect of the present invention is an image forming apparatus provided with the tension applying device according to any one of the first to third aspects .

請求項４に記載の発明によれば、簡易な構成で駆動伝達ベルトに所定の張力を付与することができるとともに駆動伝達ベルトを所定の方向に移動させることができる。このため、張力付与装置を画像形成装置に用いた場合でも、張力付与装置を設置するための大きなスペースが不要となり、ひいては画像形成装置自体を大型化してしまうことを防止することができる。 According to the fourth aspect of the invention, it is possible to apply a predetermined tension to the drive transmission belt with a simple configuration and to move the drive transmission belt in a predetermined direction. For this reason, even when the tension applying device is used in the image forming apparatus, a large space for installing the tension applying device becomes unnecessary, and as a result, the image forming apparatus itself can be prevented from being enlarged.

本発明によれば、簡易な構成で駆動伝達ベルトに所定の張力を付与するとともに駆動伝達ベルトを所定の方向に移動させることができる。   According to the present invention, it is possible to apply a predetermined tension to the drive transmission belt with a simple configuration and move the drive transmission belt in a predetermined direction.

次に、本発明の一実施形態に係る張力付与装置及び画像形成装置について、図面を参照して説明する。   Next, a tension applying device and an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings.

先ず、張力付与装置について説明する。   First, the tension applying device will be described.

図１乃至図６に示すように、張力付与装置１０は、所定の部位に固定される支持部材１２を備えている。この支持部材１２は、断面コの字状の支持部材本体１４と、支持部材１２を所定の部位に固定させるための取付部１６と、を備えている。支持部材本体１４は、第１平面部１８と、第１平面部１８の対向する端部から第１平面部１８に対して略直交する方向に延在した２つの支持片２０と、を備えている。   As shown in FIGS. 1 to 6, the tension applying device 10 includes a support member 12 fixed to a predetermined portion. The support member 12 includes a support member main body 14 having a U-shaped cross section and an attachment portion 16 for fixing the support member 12 to a predetermined portion. The support member main body 14 includes a first flat surface portion 18 and two support pieces 20 extending from opposite ends of the first flat surface portion 18 in a direction substantially orthogonal to the first flat surface portion 18. Yes.

この第１平面部１８の略中央には第１平面部１８に対して略垂直方向に延びる第１軸部２２が設けられている。この第１軸部２２には、外周に複数の歯が形成された第１プーリ２４が第１リング２５と共に取り付けられている。また、第１平面部１８の一辺１８Ａには切欠溝２６が形成されている。この切欠溝２６の切欠き方向は、後述のガイド孔４０及び位置決め孔４２の長軸方向と、一致又は略一致するように設定されている。さらに、第１平面部１８に形成された切欠溝２６の近傍には、第１軸部２２とは反対方向に折り曲げられた第１折曲片２８が形成されている。この第１折曲片２８には、その肉厚方向に貫通する貫通孔３０が形成されている。   A first shaft portion 22 extending in a substantially vertical direction with respect to the first plane portion 18 is provided at a substantially center of the first plane portion 18. A first pulley 24 having a plurality of teeth formed on the outer periphery is attached to the first shaft portion 22 together with a first ring 25. Further, a notch groove 26 is formed on one side 18 </ b> A of the first flat portion 18. The notch direction of the notch groove 26 is set so as to coincide or substantially coincide with the major axis directions of a guide hole 40 and a positioning hole 42 described later. Further, a first bent piece 28 is formed in the vicinity of the notch groove 26 formed in the first flat portion 18 and is bent in the direction opposite to the first shaft portion 22. The first bent piece 28 is formed with a through hole 30 penetrating in the thickness direction.

また、各支持片２０の先端部には、各支持片２０の延在方向と略直交する方向であって外側に延在した取付部１６がそれぞれ形成されている。この各取付部１６には、その肉厚方向に貫通する貫通孔３２がそれぞれ形成されている。この貫通孔３２にはそれぞれボルト（図示省略）が挿通され、この挿通されたボルトにより支持部材１２が所定の部位に固定される。   Further, a mounting portion 16 extending outward in the direction substantially orthogonal to the extending direction of each support piece 20 is formed at the tip of each support piece 20. Each mounting portion 16 is formed with a through-hole 32 penetrating in the thickness direction. Bolts (not shown) are respectively inserted into the through holes 32, and the support member 12 is fixed to a predetermined part by the inserted bolts.

また、張力付与装置１０は、支持部材本体１４の第１平面部１８上に配置されかつ第１平面部１８上を移動可能なスライド部材３４を備えている。スライド部材３４の一方の端部近傍には、その表面に対して略垂直方向に延びる第２軸部３６が設けられている。この第２軸部３６には、第２プーリ３８が第２リング３９と共に取り付けられている。また、スライド部材３４の略中央には、その厚み方向に貫通するとともに支持部材１２に設けられた第１軸部２２が貫通するガイド孔４０が形成されている。このガイド孔４０は長孔状に形成されているため、スライド部材３４が支持部材本体１２の第１平面部１８上をガイド孔４０の長軸方向にスライド可能となる。また、スライド部材３４のガイド孔４０近傍には、スライド部材３４を支持部材１２に固定するために用いる位置決め孔４２が形成されている。この位置決め孔４２は、ガイド孔４０と同様に、長孔状に形成されている。位置決め孔４２の長軸方向は、ガイド孔４０の長軸方向と略一致するように設定されている。この位置決め孔４２には位置決めピン４４が挿通し、位置決め孔４２を挿通した位置決めピン４４が支持部材本体１４の第１平面部１８に形成されたネジ溝４６（図４参照）と螺合することにより、スライド部材３４が支持部材１２に対して固定されるようになっている。   Further, the tension applying device 10 includes a slide member 34 that is disposed on the first flat surface portion 18 of the support member main body 14 and is movable on the first flat surface portion 18. In the vicinity of one end portion of the slide member 34, a second shaft portion 36 extending in a direction substantially perpendicular to the surface thereof is provided. A second pulley 38 is attached to the second shaft portion 36 together with a second ring 39. In addition, a guide hole 40 that penetrates in the thickness direction and penetrates the first shaft portion 22 provided in the support member 12 is formed in the approximate center of the slide member 34. Since the guide hole 40 is formed in a long hole shape, the slide member 34 can slide on the first flat surface portion 18 of the support member body 12 in the long axis direction of the guide hole 40. A positioning hole 42 used to fix the slide member 34 to the support member 12 is formed in the vicinity of the guide hole 40 of the slide member 34. The positioning hole 42 is formed in a long hole shape like the guide hole 40. The long axis direction of the positioning hole 42 is set to substantially coincide with the long axis direction of the guide hole 40. A positioning pin 44 is inserted into the positioning hole 42, and the positioning pin 44 inserted through the positioning hole 42 is screwed into a screw groove 46 (see FIG. 4) formed in the first flat portion 18 of the support member body 14. Thus, the slide member 34 is fixed to the support member 12.

また、スライド部材３４の他方の端部近傍には、第２軸部３６とは反対方向に折り曲げられた第２折曲片４８が形成されている。この第２折曲片４８には、支持片５０が形成されている。この支持片５０にはコイルばね５２が嵌められるとともに、コイルばね５２が嵌められた状態で支持片５０の先端部が支持部材１２に形成された第１折曲片２８の貫通孔３０に挿入されるように設定されている。ここで、コイルばね５２が支持片５０に嵌められた状態では、コイルばね５２の伸縮方向（弾性力が作用する方向）がガイド孔４０及び位置決め孔４２の長軸方向と一致するように設定されている。さらに、スライド部材３４には、第２軸部３６とは反対方向に折り曲げられた第３折曲片５４が形成されている。この第３折曲片５４の一部は、スライド部材３４が支持部材１２に固定された状態で、支持部材１２に形成された切欠溝２６に挿入されるように設定されている。   Further, a second bent piece 48 that is bent in the direction opposite to the second shaft portion 36 is formed in the vicinity of the other end of the slide member 34. A support piece 50 is formed on the second bent piece 48. A coil spring 52 is fitted to the support piece 50, and the distal end portion of the support piece 50 is inserted into the through hole 30 of the first bent piece 28 formed in the support member 12 with the coil spring 52 fitted. Is set to Here, in a state where the coil spring 52 is fitted to the support piece 50, the expansion / contraction direction (direction in which the elastic force acts) of the coil spring 52 is set so as to coincide with the major axis direction of the guide hole 40 and the positioning hole 42. ing. Further, the slide member 34 is formed with a third bent piece 54 that is bent in a direction opposite to the second shaft portion 36. A part of the third bent piece 54 is set to be inserted into the notch groove 26 formed in the support member 12 in a state where the slide member 34 is fixed to the support member 12.

ここで、上述した張力付与装置１０は、例えば画像形成装置５６の内部に用いられる。すなわち、図７に示すように、画像形成装置５６の内部に設けられた駆動プーリ５８と従動プーリ６０に掛け渡された駆動伝達ベルト６２の略中央の部位に張力付与装置が配置される。ここで、駆動伝達ベルト６２の一部は張力付与装置を構成する第１プーリ２４と接触するとともに、駆動伝達ベルト６２の他の一部は張力付与装置を構成する第２プーリ３８と接触する。このため、詳細は後述するが、駆動伝達ベルト６２は、張力付与装置１０により所定の張力が付与されると共に、その形状が決定されている。   Here, the tension applying device 10 described above is used, for example, inside the image forming device 56. That is, as shown in FIG. 7, the tension applying device is disposed at a substantially central portion of the drive transmission belt 62 provided between the drive pulley 58 and the driven pulley 60 provided in the image forming apparatus 56. Here, a part of the drive transmission belt 62 contacts the first pulley 24 constituting the tension applying device, and another part of the drive transmission belt 62 contacts the second pulley 38 constituting the tension applying device. Therefore, although details will be described later, the drive transmission belt 62 is given a predetermined tension by the tension applying device 10 and its shape is determined.

次に、本実施形態の張力付与装置１０及び画像形成装置５６の作用について説明する。   Next, operations of the tension applying device 10 and the image forming device 56 of the present embodiment will be described.

図１乃至図７に示すように、例えば画像形成装置５６の内部に取り付けられた支持部材１２に対してスライド部材３４が取り付けられる。このとき、第１プーリ２４と第２プーリ３８との離間距離が所定の距離となる位置で、スライド部材３４が位置決めピン４４により支持部材本体１４の第１平面部１８に固定される。そして、第１プーリ２４及び第２プーリ３８にそれぞれ接触する駆動伝達ベルト６２は、第１プーリ２４及び第２プーリ３８から所定の張力が付与される。   As shown in FIGS. 1 to 7, for example, the slide member 34 is attached to the support member 12 attached to the inside of the image forming apparatus 56. At this time, the slide member 34 is fixed to the first planar portion 18 of the support member main body 14 by the positioning pin 44 at a position where the separation distance between the first pulley 24 and the second pulley 38 is a predetermined distance. The drive transmission belt 62 that contacts the first pulley 24 and the second pulley 38 is given a predetermined tension from the first pulley 24 and the second pulley 38.

ここで、スライド部材３４が支持部材１２に対して位置決めされた状態で第１プーリ２４と第２プーリ３８との離間距離を変更する方向に支持部材１２及びスライド部材３４に対してコイルばね５２から弾性力が作用される。これにより、スライド部材３４の支持部材１２に対する位置決めを解除すると、支持部材１２及びスライド部材３４に作用するコイルばね５２の弾性力により、スライド部材３４が支持部材１２に対して移動し第１プーリ２４と第２プーリ３８との離間距離を容易に変更することができる。そして、第１プーリ２４と第２プーリ３８との離間距離が所定の距離となったところでスライド部材３４を支持部材１２に位置決めすることにより、駆動伝達ベルト６２に付与する張力を容易に変更することができる。このように、スライド部材３４を支持部材１２に対して移動させるだけで、駆動伝達ベルト６２に付与する張力を容易に調整することができる。この結果、張力付与装置１０を簡易な構成にすることができる。また、第１プーリ２４と第２プーリ３８のうち一方を固定し他方を移動可能にして駆動伝達ベルト６２に付与する張力を調整しているため、両方のプーリを移動させて駆動伝達ベルトに付与する張力を調整する構成と比較して、第１プーリ２４と第２プーリ３８の移動動作を簡易なものにすることができるため、駆動伝達ベルト６２に付与する張力を安定させることができる。また、駆動伝達ベルト６２が第１プーリ２４又は第２プーリ３８から外れるなどの不具合を防止することができる。   Here, in a state where the slide member 34 is positioned with respect to the support member 12, the coil spring 52 moves from the coil spring 52 to the support member 12 and the slide member 34 in a direction in which the distance between the first pulley 24 and the second pulley 38 is changed. Elastic force is applied. Accordingly, when the positioning of the slide member 34 with respect to the support member 12 is released, the slide member 34 moves relative to the support member 12 by the elastic force of the coil spring 52 acting on the support member 12 and the slide member 34, and the first pulley 24. And the second pulley 38 can be easily changed. Then, the tension applied to the drive transmission belt 62 can be easily changed by positioning the slide member 34 on the support member 12 when the distance between the first pulley 24 and the second pulley 38 reaches a predetermined distance. Can do. In this way, the tension applied to the drive transmission belt 62 can be easily adjusted simply by moving the slide member 34 relative to the support member 12. As a result, the tension applying device 10 can have a simple configuration. Since the tension applied to the drive transmission belt 62 is adjusted by fixing one of the first pulley 24 and the second pulley 38 and allowing the other to move, both pulleys are moved and applied to the drive transmission belt. Compared with the configuration for adjusting the tension to be adjusted, the moving operation of the first pulley 24 and the second pulley 38 can be simplified, so that the tension applied to the drive transmission belt 62 can be stabilized. In addition, problems such as the drive transmission belt 62 coming off from the first pulley 24 or the second pulley 38 can be prevented.

また、スライド部材３４が支持部材１２に位置決めされた状態では、第３折曲片５４が切欠溝２６に挿入され、ガイド孔４０に第１軸部２２が挿通さていることにより、スライド部材３４の支持部材１２に対する移動方向を一方向にすることができる。これにより、第１プーリ２４と第２プーリ３８との離間距離を正確に調整することができ、駆動伝達ベルト６２に付与する張力の調整を安定させることができる。   When the slide member 34 is positioned on the support member 12, the third bent piece 54 is inserted into the notch groove 26, and the first shaft portion 22 is inserted into the guide hole 40. The moving direction with respect to the support member 12 can be one direction. Thereby, the separation distance between the first pulley 24 and the second pulley 38 can be accurately adjusted, and the adjustment of the tension applied to the drive transmission belt 62 can be stabilized.

また、コイルばね５２からの弾性力の作用方向と、ガイド孔４０の長軸方向と、切欠溝２６の切欠き方向とが、全て同一方向又は略同一方向となるように設定されていることにより、スライド部材３４の支持部材１２に対する移動方向を一方向にすることができる。これにより、第１プーリ２４と第２プーリ３８との離間距離を正確に調整することができ、駆動伝達ベルト６２に付与する張力の調整を安定させることができる。   Further, the direction in which the elastic force from the coil spring 52 acts, the major axis direction of the guide hole 40, and the notch direction of the notch groove 26 are all set to be the same direction or substantially the same direction. The moving direction of the slide member 34 relative to the support member 12 can be one direction. Thereby, the separation distance between the first pulley 24 and the second pulley 38 can be accurately adjusted, and the adjustment of the tension applied to the drive transmission belt 62 can be stabilized.

また、スライド部材３４が支持部材１２に位置決めされた状態でスライド部材３４を支持部材１２に固定する位置決めピン４４が設けられていることにより、スライド部材３４の支持部材１２に対する位置決め状態を維持することができる。   Further, the positioning pin 44 for fixing the slide member 34 to the support member 12 in a state where the slide member 34 is positioned on the support member 12 is provided, so that the positioning state of the slide member 34 with respect to the support member 12 is maintained. Can do.

また、上記張力付与装置１０を画像形成装置５６に用いた場合でも、張力付与装置１０を設置するための大きなスペースが不要となり、ひいては画像形成装置５６自体を大型化してしまうことを防止することができる。   Further, even when the tension applying device 10 is used for the image forming apparatus 56, a large space for installing the tension applying device 10 is not required, and as a result, the image forming apparatus 56 itself can be prevented from being enlarged. it can.

なお、駆動伝達ベルト６２に付与される張力を変更する場合には、位置決めピン４４のネジ溝４６に対する螺合を緩める。位置決めピン４４のネジ溝４６に対する螺合を緩めると、コイルばね５２の弾性力により、スライド部材３４が支持部材１２に対してガイド孔４０の長軸方向に移動される。そして、第１プーリ２４と第２プーリ３８との離間距離を決定し、第１プーリ２４と第２プーリ３８との離間距離の決定後、位置決めピン４４をネジ溝４６に螺合させてスライド部材３４を支持部材１２に固定させる。これにより、第１プーリ２４及び第２プーリ３８から駆動伝達ベルト６２に作用する張力を容易に変更することができる。特に、張力付与装置１０を画像形成装置５６の内部に設けた場合には、張力付与装置１０を画像形成装置５６から取り外すことなく画像形成装置５６に取り付けた状態で、容易に第１プーリ２４と第２プーリ３８の離間距離を変更することができる。   In addition, when changing the tension | tensile_strength provided to the drive transmission belt 62, the screwing with respect to the thread groove 46 of the positioning pin 44 is loosened. When the screwing of the positioning pin 44 with respect to the screw groove 46 is loosened, the slide member 34 is moved in the major axis direction of the guide hole 40 with respect to the support member 12 by the elastic force of the coil spring 52. Then, the distance between the first pulley 24 and the second pulley 38 is determined, and after the distance between the first pulley 24 and the second pulley 38 is determined, the positioning pin 44 is screwed into the screw groove 46 to slide the slide member. 34 is fixed to the support member 12. Thereby, the tension acting on the drive transmission belt 62 from the first pulley 24 and the second pulley 38 can be easily changed. In particular, when the tension applying device 10 is provided inside the image forming apparatus 56, the tension applying device 10 can be easily attached to the image forming apparatus 56 without being removed from the image forming apparatus 56. The separation distance of the second pulley 38 can be changed.

本発明の一実施形態に係る張力付与装置の斜視図である。1 is a perspective view of a tension applying device according to an embodiment of the present invention. 本発明の一実施形態に係る張力付与装置の平面図である。It is a top view of the tension | tensile_strength provision apparatus which concerns on one Embodiment of this invention. 本発明の一実施形態に係る張力付与装置の底面図である。It is a bottom view of the tension | tensile_strength provision apparatus which concerns on one Embodiment of this invention. 本発明の一実施形態に係る張力付与装置の組立分解図である。It is an assembly exploded view of the tension | tensile_strength provision apparatus which concerns on one Embodiment of this invention. 本発明の一実施形態に係る張力付与装置を構成する支持部材の斜視図である。It is a perspective view of the supporting member which constitutes the tension applying device concerning one embodiment of the present invention. 本発明の一実施形態に係る張力付与装置を構成するスライド部材の斜視図である。It is a perspective view of the slide member which comprises the tension | tensile_strength provision apparatus which concerns on one Embodiment of this invention. 本発明の一実施形態に係る張力付与装置を備えた画像形成装置の部分的な構成図である。1 is a partial configuration diagram of an image forming apparatus including a tension applying device according to an embodiment of the present invention.

符号の説明Explanation of symbols

１０ 張力付与装置
１２ 支持部材
２２ 第１軸部（第１の軸部）
２４ 第１プーリ（第１のプーリ）
２６ 切欠溝
３４ スライド部材
３６ 第２軸部（第２の軸部）
３８ 第２プーリ（第２のプーリ）
４０ ガイド孔
４４ 位置決めピン（固定部材）
５２ コイルばね（弾性部材）
５４ 第３折曲片（挿入片）
５６ 画像形成装置 DESCRIPTION OF SYMBOLS 10 Tension provision apparatus 12 Support member 22 1st axial part (1st axial part)
24 first pulley (first pulley)
26 Notch groove 34 Slide member 36 Second shaft portion (second shaft portion)
38 Second pulley (second pulley)
40 Guide hole 44 Positioning pin (fixing member)
52 Coil spring (elastic member)
54 Third bent piece (insertion piece)
56 Image forming apparatus

Claims (4)

所定の部位に固定されるとともに第１のプーリを回転可能に支持する支持部材と、
前記支持部材上に移動可能に配置され第２のプーリを回転可能に支持するスライド部材と、
前記スライド部材と前記支持部材との間に配置され、前記スライド部材が前記支持部材に対して位置決めされた状態で前記第１のプーリと前記第２のプーリとの離間距離を変更する方向に前記支持部材及び前記スライド部材に対して弾性力を作用する弾性部材と、
を有する張力付与装置であって、
前記支持部材には、前記第１のプーリが回転可能に取り付けられる第１の軸部と、切欠溝と、がそれぞれ形成され、
前記スライド部材には、前記第２のプーリが回転可能に取り付けられる第２の軸部と、前記第１の軸部が挿通される長孔状のガイド孔と、前記切欠溝に挿入される挿入片と、がそれぞれ形成され、
前記スライド部材が前記支持部材に位置決めされた状態では、前記挿入片が前記切欠溝に挿入され、前記ガイド孔に前記第１の軸部が挿通さていることを特徴とする張力付与装置。 A support member fixed to a predetermined portion and rotatably supporting the first pulley;
A slide member movably disposed on the support member and rotatably supporting the second pulley;
The slide member is disposed between the slide member and the support member, and the slide member is positioned with respect to the support member in a direction in which a separation distance between the first pulley and the second pulley is changed. An elastic member that applies an elastic force to the support member and the slide member;
A tensioning device having:
The support member is formed with a first shaft portion to which the first pulley is rotatably attached, and a notch groove, respectively.
The slide member has a second shaft portion to which the second pulley is rotatably attached, a long hole-shaped guide hole through which the first shaft portion is inserted, and an insertion to be inserted into the notch groove. Each piece is formed,
In the state in which the slide member is positioned on the support member, the insertion piece is inserted into the cutout groove, and the first shaft portion is inserted into the guide hole . 前記弾性部材からの弾性力の作用方向と、前記ガイド孔の長軸方向と、前記切欠溝の切欠き方向とは、全て同一方向又は略同一方向となるように設定されていることを特徴とする請求項１に記載の張力付与装置。 The action direction of the elastic force from the elastic member, the long axis direction of the guide hole, and the notch direction of the notch groove are all set to be the same direction or substantially the same direction. The tension applying device according to claim 1. 前記スライド部材が前記支持部材に位置決めされた状態で前記スライド部材を前記支持部材に固定する固定部材が設けられていることを特徴とする請求項１又は２に記載の張力付与装置。 The tension applying device according to claim 1 , wherein a fixing member is provided for fixing the slide member to the support member in a state where the slide member is positioned on the support member . 請求項１乃至３のいずれか１項に記載の張力付与装置を備えたことを特徴とする画像形成装置。 An image forming apparatus comprising the tension applying device according to claim 1 .
JP2005330854A 2005-11-15 2005-11-15 Tension applying device and image forming apparatus Expired - Fee Related JP4385334B2 (en)

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