JP2008306536A - Driving device and image reader and image forming apparatus with the driving device - Google Patents

Driving device and image reader and image forming apparatus with the driving device Download PDF

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JP2008306536A
JP2008306536A JP2007152544A JP2007152544A JP2008306536A JP 2008306536 A JP2008306536 A JP 2008306536A JP 2007152544 A JP2007152544 A JP 2007152544A JP 2007152544 A JP2007152544 A JP 2007152544A JP 2008306536 A JP2008306536 A JP 2008306536A
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drive
wire
driving
pulley
drive pulley
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Yoshiaki Nagao
佳明 長尾
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Ricoh Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent distortion of an image due to vibration or the like when a movable object performing image reading is moved. <P>SOLUTION: A winding starting position of a driving wire 11, 11' is changed at an initial position at start of driving and at an end position where a mobile moves at a maximum. In particular, when a winding starting direction (or a take-up direction) of the driving wire is made closer to a one-side flange 21 in an axial direction of a driving pulley 15 due to arrangement of the driving pulley 15, a winding starting portion of the driving wire and the driving wire that is wound for one circumference are rubbed against each other. In such a case, even when the driving wire 11, 11' gets closer to a portion of the flange 21, if the flange 21 is formed in a spiral shape, impulse is prevented from occurring caused by rubbing the winding starting portion of the driving wire and the driving wire wound for one circumference against each other, such that stable driving can be performed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、駆動プーリに巻回されて駆動される駆動ワイヤによって、光学系の可動体を移動させて原稿から画像の読み取りを行うための駆動装置とこれを有する画像読取装置および画像形成装置に関するものである。   The present invention relates to a drive device for reading an image from a document by moving a movable body of an optical system by a drive wire wound around and driven by a drive pulley, and an image reading apparatus and an image forming apparatus having the drive device. Is.

複写機、ファクシミリ、スキャナなどには、移動する光学系により原稿を露光走査することによって、原稿の画像を読み取る画像読取装置が設けられている。この場合、光学系は、例えば図１に示すように、光源であるランプ２と第１ミラー３とを搭載した第１走行体（キャリッジ）６と、第２ミラー４および第３ミラー５とを搭載した第２走行体（キャリッジ）７を移動可能に設け、原稿１０の走査時には第１走行体６と第２走行体７とを２：１の速度関係をもって同一方向に移動させ、光路長を一定に保って原稿画像を光電変換素子（ＣＣＤ９）の結像面に結像させるようになっている。第１および第２走行体６，７の移動は、駆動プーリ１５に巻回された駆動ワイヤ１１に走行体をそれぞれ接続し、駆動プーリの回転を制御することによって行っている。   Copiers, facsimiles, scanners, and the like are provided with an image reading device that reads an image of an original by exposing and scanning the original with a moving optical system. In this case, for example, as shown in FIG. 1, the optical system includes a first traveling body (carriage) 6 on which a lamp 2 as a light source and a first mirror 3 are mounted, and a second mirror 4 and a third mirror 5. The mounted second traveling body (carriage) 7 is movably provided. When scanning the document 10, the first traveling body 6 and the second traveling body 7 are moved in the same direction with a 2: 1 speed relationship, and the optical path length is increased. The document image is formed on the image forming surface of the photoelectric conversion element (CCD 9) while being kept constant. The first and second traveling bodies 6 and 7 are moved by connecting the traveling bodies to the drive wires 11 wound around the drive pulley 15 and controlling the rotation of the drive pulley.

このように光学系を駆動ワイヤ１１によって駆動する画像読取装置においては、原稿の画像を一定に保つため、原稿の読み取り範囲においては前記走行体を一定の速度で駆動する必要がある。そのために、駆動プーリ１５の駆動ワイヤ１１を巻き付ける始まりの部分において、ワイヤの屈曲によりこの部分とワイヤとにより発生する振動を軽減する必要がある。   In the image reading apparatus that drives the optical system by the drive wire 11 in this way, it is necessary to drive the traveling body at a constant speed in the original reading range in order to keep the original image constant. For this reason, it is necessary to reduce the vibration generated by the bending of the wire and the wire at the beginning of the drive pulley 15 where the drive wire 11 is wound.

図７（ａ），（ｂ）は従来の駆動プーリと駆動ワイヤの巻回しの状態を示す図である。図７（ａ），（ｂ）を参照しながら駆動プーリに係る動作について説明する。駆動ワイヤ１１を巻き付ける始まりの部分において、駆動プーリ１５に取り付ける際に駆動ワイヤ１１の屈曲部分１３ができる。図７（ａ）は駆動開始時の駆動ワイヤ１１の位置を示し、図７（ｂ）は光学系を最大に移動したときの駆動ワイヤ１１の位置を示している。   7 (a) and 7 (b) are views showing a conventional winding state of a driving pulley and a driving wire. The operation related to the drive pulley will be described with reference to FIGS. 7 (a) and 7 (b). When the drive wire 11 is wound around, the bent portion 13 of the drive wire 11 is formed when the drive wire 11 is attached to the drive pulley 15. FIG. 7A shows the position of the drive wire 11 at the start of driving, and FIG. 7B shows the position of the drive wire 11 when the optical system is moved to the maximum.

すなわち、駆動プーリ１５は、可動体の移動時において、駆動プーリ１５に巻かれた駆動ワイヤ１１の巻き出しの位置が移動する。その際、駆動ワイヤ１１の巻き始めの屈曲部分１３に巻き出し（または、巻き取り）部分がくる度に、駆動ワイヤ１１同士が擦れて、振動を発生させることがある。したがって、駆動プーリ１５の駆動ワイヤ１１を巻き付ける始まりの屈曲部分１３において、駆動ワイヤ同士の擦れを発生させないことが、安定した駆動を行うには好ましい。   That is, the drive pulley 15 moves the unwinding position of the drive wire 11 wound around the drive pulley 15 when the movable body moves. At that time, the drive wires 11 may rub against each other each time the unwinding (or winding) portion comes to the bent portion 13 at the beginning of winding of the drive wire 11 to generate vibration. Therefore, it is preferable for stable driving to prevent the drive wires from rubbing at the first bent portion 13 where the drive wire 11 of the drive pulley 15 is wound.

また、画像読取装置の小型化，低コスト化等を図るとともに、光学系の可動体を安定して駆動させるための構成が、特許文献１〜３に開示されている。
特開２００３−１６７３０１号公報 特開２００４−３５４４３１号公報 特開平８−０９５１６８号公報 Further, Patent Documents 1 to 3 disclose configurations for reducing the size and cost of the image reading apparatus and driving the movable body of the optical system stably.
JP 2003-167301 A JP 2004-354431 A JP-A-8-095168

しかしながら、駆動プーリの両端部に余裕をもたせた場合、駆動プーリが大型化されるので、駆動装置全体が大型にならざるを得ない。そこで、装置の小型化のためには、できるだけ使用しない範囲を少なくする必要がある。また、駆動ワイヤを巻き付ける位置の誤差、ばらつき等もあり、使用不可の範囲を確実に使用しないようにするためには、それらも考慮する必要があり、これらを勘案して装置が大型化しないようにすることは非常に難しい。   However, when a margin is provided at both ends of the drive pulley, the drive pulley is increased in size, so the entire drive device must be increased in size. Therefore, in order to reduce the size of the device, it is necessary to reduce the unused range as much as possible. In addition, there are errors and variations in the position where the drive wire is wound, and in order to ensure that the unusable range is not used, it is necessary to consider them. It is very difficult to do.

本発明は、前記従来技術の問題を解決することに指向するものであり、画像読み取りを行う可動体の移動時に振動等による画像の乱れを防ぐことができる駆動装置とこれを有する画像読取装置および画像形成装置を提供することを目的とする。   The present invention is directed to solving the above-described problems of the prior art, and a driving device capable of preventing image disturbance due to vibration or the like when a movable body that performs image reading is moved, and an image reading device having the driving device, and An object is to provide an image forming apparatus.

前記の目的を達成するために、本発明に係る請求項１の駆動装置は、駆動プーリに巻回された駆動ワイヤに可動体を接続し、駆動プーリの回動により駆動ワイヤを駆動して可動体を移動させる駆動装置において、駆動プーリは、駆動ワイヤを巻き付ける側のフランジが螺旋状に厚くなる構成によって、駆動プーリに巻き付ける駆動ワイヤの少なくとも一方のフランジが螺旋状となっているため、駆動ワイヤを巻き始める部分と、１周巻回した後の部分で、駆動ワイヤにストレスがかかることなく、駆動ワイヤ同士の擦れによる衝撃を軽減できる。   In order to achieve the above object, the drive device according to claim 1 of the present invention is configured such that a movable body is connected to a drive wire wound around a drive pulley, and the drive wire is driven by rotation of the drive pulley. In the drive device for moving the body, the drive pulley has a structure in which the flange on the side around which the drive wire is wound is thickened in a spiral shape, and at least one flange of the drive wire wound around the drive pulley has a spiral shape. The impact due to friction between the drive wires can be reduced without applying stress to the drive wires at the portion where the winding starts and the portion after one turn.

また、請求項２に記載した駆動装置は、請求項１の駆動装置であって、駆動プーリの螺旋状に厚くなるフランジのピッチは、駆動ワイヤの直径よりも大きいことにより、駆動ワイヤ同士の擦れによる衝撃を軽減できる。   Further, the drive device according to claim 2 is the drive device according to claim 1, wherein the pitch of the flange which is thickened in a spiral shape of the drive pulley is larger than the diameter of the drive wire, so that the drive wires rub against each other. The impact by can be reduced.

また、請求項３に記載した駆動装置は、請求項１，２の駆動装置であって、駆動ワイヤは、駆動プーリのフランジで螺旋の起点部分から内側に向かって巻き付けられていることにより、螺旋の起点部分から巻き始めることで、駆動ワイヤの巻き始める部分の駆動ワイヤ同士の屈曲を伴う擦れを防ぐことができる。
を特徴とする。 The drive device according to claim 3 is the drive device according to claim 1 or 2, wherein the drive wire is wound inwardly from the starting portion of the spiral by the flange of the drive pulley, so By starting the winding from the starting point portion, it is possible to prevent rubbing accompanying the bending of the driving wires at the portion where the driving wire starts to be wound.
It is characterized by.

また、請求項４に記載した駆動装置は、請求項３の駆動装置であって、駆動ワイヤは、駆動プーリ両端のフランジ側からそれぞれ内側に向かって逆方向に巻き付けられていることにより、巻き取られる駆動ワイヤと繰り出される駆動ワイヤが、軸方向に隣り合わせにでき、駆動プーリの直径が軸方向に均一でなくても、駆動範囲内で、巻かれている駆動ワイヤの長さを等しく保つことができ、繰り出されている駆動ワイヤの長さも等しく保つことができ、可動体を等速度で駆動することができ、また可動体の位置がずれることを防ぐことができる。   Further, the drive device according to claim 4 is the drive device according to claim 3, wherein the drive wires are wound in the opposite direction from the flange sides at both ends of the drive pulley inwardly, respectively. The drive wire to be fed and the drive wire to be fed out can be adjacent to each other in the axial direction, and even if the diameter of the drive pulley is not uniform in the axial direction, the length of the wound drive wire can be kept equal within the drive range. In addition, the lengths of the drive wires that are fed out can be kept equal, the movable body can be driven at a constant speed, and the position of the movable body can be prevented from shifting.

また、請求項５に記載した駆動装置は、駆動プーリの螺旋状に厚くなるフランジは、駆動プーリの軸方向で片側に寄った駆動プーリから可動体に接続するために延長した駆動ワイヤの出射方向に近い側であることにより、螺旋形状のフランジに案内されて駆動ワイヤの巻き始める部分の駆動ワイヤ同士の屈曲を伴う擦れを防ぐことができる。   Further, in the drive device according to claim 5, the flange that is thickened in a spiral shape of the drive pulley has an emission direction of the drive wire that is extended to connect to the movable body from the drive pulley that is closer to one side in the axial direction of the drive pulley. By being close to the side, it is possible to prevent rubbing accompanied by bending of the drive wires at the portion where the drive wires start to be wound guided by the helical flange.

また、請求項６に記載した駆動装置は、請求項１〜５の駆動装置であって、駆動プーリは、合成樹脂により成型されたことにより、従来のアルミニウム、亜鉛ダイキャスト、板金等に比べて低価格で製作することができる。   Further, the drive device according to claim 6 is the drive device according to claims 1 to 5, wherein the drive pulley is molded of synthetic resin, so that compared to conventional aluminum, zinc die-cast, sheet metal, etc. Can be manufactured at a low price.

また、請求項７に記載した画像読取装置は、請求項１〜６のいずれか１項に記載の駆動装置を備え、駆動装置によって駆動される光学系により原稿の画像を読み取ることにより、安定した走行が得られ、正確な原稿の画像を読み取ることができる。   According to a seventh aspect of the present invention, there is provided an image reading apparatus including the driving device according to any one of the first to sixth aspects, wherein a document image is stably read by an optical system driven by the driving device. Running is obtained, and an accurate image of the original can be read.

また、請求項８に記載した画像形成装置は、請求項１〜６のいずれか１項に記載の駆動装置を備え、駆動装置によって駆動される光学系により原稿の画像を読み取り、読み取った情報に基づき、記録媒体に画像を形成することにより、安定した走行が得られ、正確な原稿の画像を読み取り処理することができる。   An image forming apparatus according to an eighth aspect includes the driving device according to any one of the first to sixth aspects, reads an image of a document by an optical system driven by the driving device, and converts the read information into the read information. Based on this, by forming an image on a recording medium, stable running can be obtained, and an accurate image of a document can be read and processed.

本発明によれば、駆動プーリの駆動ワイヤを巻き付ける側のフランジを螺旋状とすることで、巻き始める部分の駆動ワイヤと、駆動プーリを１周巻回した後の駆動ワイヤとの間にストレスがかかることなく、駆動ワイヤ同士の擦れによる衝撃を軽減し、安定した可動体の駆動をすることができるという効果を奏する。   According to the present invention, since the flange on the side of the drive pulley around which the drive wire is wound is formed in a spiral shape, stress is generated between the drive wire at the start of winding and the drive wire after the drive pulley is wound once. Without this, it is possible to reduce the impact caused by rubbing between the drive wires and to drive the movable body stably.

以下、図面を参照して本発明における実施の形態を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は本発明の実施形態における画像読取装置の概略構成を示す図であり、図２は駆動機構を説明するための斜視図である。   FIG. 1 is a diagram showing a schematic configuration of an image reading apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view for explaining a drive mechanism.

図１，図２に示すように、画像読取装置は、透明な平板ガラス（コンタクトガラス）によって構成された原稿載置台１の上に載せられた原稿１０に、光源であるランプ２によって光を照射し、その反射光は第１ミラー３から第２ミラー４そして第３ミラー５によって反射された後、レンズ８によって集光され、ＣＣＤ９に結像する。ランプ２と第１ミラー３は第１走行体６に設けられ、第２ミラー４と第３ミラー５は第２走行体７に設けられている。これら第１および第２走行体６，７はその両側部の下方に配設されたガイドレール（図示しない）に沿って移動可能に構成されている。そして、第１走行体６が距離Ｌを進む間に、第２走行体７は距離Ｌ／２進むことによって、レンズ８の光路長を一定に保ちながら原稿１０の全体を走査する。   As shown in FIGS. 1 and 2, the image reading apparatus irradiates a document 10 placed on a document table 1 made of transparent flat glass (contact glass) with a lamp 2 as a light source. The reflected light is reflected by the first mirror 3, the second mirror 4 and the third mirror 5, and then condensed by the lens 8 and forms an image on the CCD 9. The lamp 2 and the first mirror 3 are provided on the first traveling body 6, and the second mirror 4 and the third mirror 5 are provided on the second traveling body 7. The first and second traveling bodies 6 and 7 are configured to be movable along guide rails (not shown) disposed below both side portions thereof. Then, while the first traveling body 6 travels the distance L, the second traveling body 7 travels the distance L / 2, thereby scanning the entire document 10 while keeping the optical path length of the lens 8 constant.

第１走行体６は移動方向の両側部にそれぞれ位置する駆動ワイヤ１１にワイヤクランプによって取り付けられ、第２走行体７は同じく移動方向の両側部にそれぞれ設けられたプーリ１２に駆動ワイヤ１１が巻き付けられている。第１および第２走行体６，７の両側にそれぞれ位置する駆動ワイヤ１１は、これら第１，第２走行体６，７の移動方向に直交するように位置する駆動軸１４に間隔をおいて設けられた２つの駆動プーリ１５に複数回巻き付けられている。   The first traveling body 6 is attached by wire clamps to driving wires 11 positioned on both sides in the moving direction, and the second traveling body 7 is wound around pulleys 12 respectively provided on both sides in the moving direction. It has been. The drive wires 11 positioned on both sides of the first and second traveling bodies 6 and 7 are spaced apart from the drive shaft 14 positioned so as to be orthogonal to the moving direction of the first and second traveling bodies 6 and 7. It is wound a plurality of times around the two drive pulleys 15 provided.

駆動軸１４はその一端にタイミングプーリ１６が設けられ、このタイミングプーリ１６は、駆動源としての正逆転可能なステップモータなどで構成されたモータ１８によって駆動されるように、モータ１８の駆動軸１４との間にタイミングベルト１７が渡されている。各駆動ワイヤ１１の一端は装置本体（図示しない）に、そして他端はスプリング１９を介して同じく装置本体に固定されている。また、２０は固定プーリである。   The drive shaft 14 is provided with a timing pulley 16 at one end, and the timing pulley 16 is driven by a motor 18 composed of a step motor capable of forward and reverse rotation as a drive source. The timing belt 17 is passed between the two. One end of each drive wire 11 is fixed to the apparatus main body (not shown), and the other end is fixed to the apparatus main body via a spring 19. Reference numeral 20 denotes a fixed pulley.

そして、駆動軸１４には、２つの駆動プーリ１５がそれぞれ駆動軸１４に締結されている。各駆動プーリ１５は、合成樹脂で作られ、外周部の駆動ワイヤ１１を巻き付ける側のフランジ部分を螺旋状とし、駆動プーリ１５の軸方向の一端で螺旋の起点部分より駆動ワイヤ１１を巻き始めて、駆動プーリ１５の内側に向かって巻かれている。また、駆動プーリ１５の中心部には、駆動軸１４が挿通される。   Two drive pulleys 15 are fastened to the drive shaft 14 on the drive shaft 14. Each drive pulley 15 is made of a synthetic resin, and the flange portion on the side around which the drive wire 11 is wound is formed in a spiral shape, and the drive wire 11 starts to be wound from the starting point of the spiral at one end in the axial direction of the drive pulley 15. It is wound toward the inside of the drive pulley 15. A drive shaft 14 is inserted through the center of the drive pulley 15.

このように、駆動プーリ１５の軸方向の両端部にフランジ２１を設けることにより、駆動ワイヤ１１の巻き付け作業の基準とすることができ、駆動プーリ１５の回転における駆動ワイヤ１１のズレからくる駆動ワイヤ１１の脱プーリを防止することが可能となる。駆動プーリ１５に設けたフランジ２１は、駆動プーリ１５の外周面で軸方向の両端部にあることが望ましい。   Thus, by providing the flanges 21 at both axial ends of the drive pulley 15, it can be used as a reference for the winding work of the drive wire 11, and the drive wire comes from the deviation of the drive wire 11 in the rotation of the drive pulley 15. 11 can be prevented from being removed. It is desirable that the flanges 21 provided on the drive pulley 15 are at both ends in the axial direction on the outer peripheral surface of the drive pulley 15.

また、図３（ａ），（ｂ）に示すように、駆動プーリ１５の両端でフランジ２１の間には、駆動ワイヤ１１を通す穴が設けられ、さらに駆動ワイヤ１１と駆動プーリ１５との位置決め用として駆動ワイヤ１１を係止する係止部１５ａが設けられている。   As shown in FIGS. 3A and 3B, a hole through which the drive wire 11 is passed is provided between the flanges 21 at both ends of the drive pulley 15, and the positioning of the drive wire 11 and the drive pulley 15 is further performed. For this purpose, a locking portion 15a for locking the drive wire 11 is provided.

駆動プーリ１５の軸方向の長さすなわち幅は、図１に示す第１および第２走行体６，７を所定の位置（初期位置〜最端位置）まで移動させる必要な長さに少なくとも３６０°（１周）以上を駆動ワイヤ１１が重なり合うことなく巻き付けることができる長さ、すなわち幅を有している。駆動プーリ１５は、円筒部に駆動ワイヤ１１を巻き付けることにより、駆動プーリ１５の回転が駆動ワイヤ１１を駆動し、第１および第２移動体６，７が駆動される仕組みとなっている。   The length or width in the axial direction of the drive pulley 15 is at least 360 ° to a length necessary to move the first and second traveling bodies 6 and 7 shown in FIG. 1 to a predetermined position (initial position to the extreme end position). It has a length that allows the drive wire 11 to be wound without overlapping (one round), that is, a width. The drive pulley 15 has a mechanism in which the drive wire 11 is wound around the cylindrical portion so that the rotation of the drive pulley 15 drives the drive wire 11 and the first and second moving bodies 6 and 7 are driven.

また、駆動プーリ１５の円筒部に駆動ワイヤ１１を重なり合うことなく巻き付けることで、駆動性能の向上化を図ることとなる。すなわち、駆動プーリ１５の円筒部の周面から駆動ワイヤ１１が重なって浮いていると、駆動プーリ１５の回転により駆動ワイヤ１１を駆動する際、駆動プーリ１５の円筒部の周面から浮いた駆動ワイヤ１１と次に巻回される駆動ワイヤ１１とが擦れ、駆動ノイズとなって駆動性能の劣化となるためである。   In addition, the driving performance is improved by winding the driving wire 11 around the cylindrical portion of the driving pulley 15 without overlapping. In other words, when the drive wire 11 is floated from the circumferential surface of the cylindrical portion of the drive pulley 15, when the drive wire 11 is driven by the rotation of the drive pulley 15, the drive floated from the circumferential surface of the cylindrical portion of the drive pulley 15. This is because the wire 11 and the drive wire 11 wound next rub against each other, resulting in drive noise and deterioration in drive performance.

そこで、本実施形態においては、図４（ａ），（ｂ）に示すように駆動プーリ１５の円筒部の周面に駆動ワイヤ１１を巻回している。図４（ａ）は第１および第２走行体６，７が初期位置にあり駆動開始時の駆動プーリ１５の状態を示し、図４（ｂ）は第１および第２走行体６，７が最端位置となる最大に移動したときの駆動プーリ１５の状態を示している。   Therefore, in the present embodiment, the drive wire 11 is wound around the circumferential surface of the cylindrical portion of the drive pulley 15 as shown in FIGS. 4A shows the state of the drive pulley 15 when the first and second traveling bodies 6 and 7 are in the initial positions and the drive is started, and FIG. 4B shows the first and second traveling bodies 6 and 7. The state of the drive pulley 15 when moved to the maximum which is the extreme end position is shown.

すなわち、駆動プーリ１５の外周部のフランジ２１に設けた、それぞれの巻き始める部分から駆動ワイヤ１１，１１’を軸方向両端の外周から中心部に向かって巻き付けていくことにより、駆動ワイヤ１１，１１’が巻かれている駆動プーリ１５の円筒部の周面においては、巻き取りと巻き出される駆動ワイヤが同じ位置（円筒部の周面）になり、駆動プーリ１５の回転により巻かれている駆動ワイヤ１１の長さと、繰り出されている駆動ワイヤ１１’の長さは変わることがなく一定となる。   That is, the drive wires 11 and 11 ′ are wound from the outer periphery at both ends in the axial direction toward the center portion from the respective winding start portions provided on the flange 21 on the outer peripheral portion of the drive pulley 15. On the peripheral surface of the cylindrical portion of the drive pulley 15 around which the winding is wound, the drive wire wound and unwound is at the same position (the peripheral surface of the cylindrical portion), and the drive wound by the rotation of the drive pulley 15 The length of the wire 11 and the length of the driving wire 11 ′ that is fed out are not changed and are constant.

また、図４（ａ），（ｂ）に示すように駆動開始時の初期位置と、移動体が最大に移動した最端位置とにおいて、駆動ワイヤ１１，１１’の巻き出しの位置が変化する。この際、フランジ２１の部分に駆動ワイヤ１１，１１’が近づいても、フランジ２１を螺旋形状とすることによって、駆動ワイヤの巻き始める部分と１周巻回した駆動ワイヤとの擦れによる衝撃の発生を防止できる。   Further, as shown in FIGS. 4A and 4B, the unwinding position of the drive wires 11 and 11 ′ changes between the initial position at the start of driving and the end position where the movable body has moved to the maximum. . At this time, even if the drive wires 11 and 11 ′ approach the flange 21 portion, the flange 21 is formed in a spiral shape, thereby generating an impact due to rubbing between the drive wire winding portion and the drive wire wound once. Can be prevented.

特に、図５（ａ），（ｂ）に示すように、駆動プーリ１５の配置により、駆動ワイヤの巻き出し方向（あるいは、巻き取り方向）から可動体に接続するため延長した駆動ワイヤの出射方向が、駆動プーリ１５の軸方向で片側のフランジ２１’に寄った場合、フランジ２１’側で駆動ワイヤの巻き始める部分と１周巻回した駆動ワイヤとの擦れが発生しやすくなるため、フランジ２１’を螺旋状に厚くする（図５（ｂ）のＡで示す部分）。このようにすることで、駆動ワイヤは、駆動プーリ１５の駆動により巻き出し，巻き取りする際に、フランジ２１’の螺旋形状に案内されて、駆動ワイヤの巻き始める部分と１周巻回した駆動ワイヤとの擦れの発生を防止することができる。   In particular, as shown in FIGS. 5A and 5B, the drive pulley 15 is arranged so that the drive wire is extended in order to connect to the movable body from the drive wire unwinding direction (or winding direction). However, when it approaches the flange 21 'on one side in the axial direction of the drive pulley 15, the flange 21' is liable to be rubbed between the portion where the drive wire starts to be wound and the drive wire wound once around. 'Is thickened spirally (portion indicated by A in FIG. 5B). By doing so, the drive wire is guided by the spiral shape of the flange 21 ′ when it is unwound and wound by driving of the drive pulley 15, and the drive wound around the drive wire and the portion where the drive wire starts to wind. Generation of rubbing with the wire can be prevented.

なお、図５（ａ），（ｂ）では両方のフランジ２１，２１’を螺旋形状としているが、駆動ワイヤの出射方向が片寄った駆動プーリ１５片側のフランジ２１’のみを螺旋形状としても良い。   In FIGS. 5A and 5B, both flanges 21 and 21 'are formed in a spiral shape. However, only the flange 21' on one side of the drive pulley 15 in which the emission direction of the drive wire is offset may be formed in a spiral shape.

また、駆動プーリ１５のフランジ２１に設ける螺旋形状の厚さＰ（ピッチ）は、図６（ａ）に示すように、駆動ワイヤの直径Ｗよりも大きい「Ｐ＞Ｗ」の関係とすることで、駆動ワイヤの巻き始める部分と１周巻回した駆動ワイヤとの擦れによる衝撃が発生することを防止でき、安定した駆動が可能となる。   Further, the thickness P (pitch) of the spiral shape provided on the flange 21 of the drive pulley 15 is such that “P> W”, which is larger than the diameter W of the drive wire, as shown in FIG. Further, it is possible to prevent an impact due to rubbing between the portion where the driving wire starts to be wound and the driving wire wound once, so that stable driving is possible.

本発明に係る駆動装置とこれを有する画像読取装置および画像形成装置は、駆動プーリの駆動ワイヤを巻き付ける側のフランジを螺旋状とすることで、巻き始める部分の駆動ワイヤと、駆動プーリを１周巻回した後の駆動ワイヤとの間にストレスがかかることなく、駆動ワイヤ同士の擦れによる衝撃を軽減し、安定した可動体の駆動をすることができ、駆動プーリに巻回されて駆動される駆動ワイヤを用いる駆動系として有用である。   The drive device according to the present invention, the image reading apparatus and the image forming apparatus having the drive device have a helical shape around the drive wire around which the drive wire is wound. Without applying stress between the wound drive wires, the impact due to friction between the drive wires can be reduced, and a stable movable body can be driven, which is wound and driven by a drive pulley. This is useful as a drive system using a drive wire.

本発明の実施形態における画像読取装置の概略構成を示す図1 is a diagram illustrating a schematic configuration of an image reading apparatus according to an embodiment of the present invention. 駆動機構を説明するための斜視図A perspective view for explaining a drive mechanism 駆動プーリの（ａ）は正面図、（ｂ）は（ａ）のＥ−Ｅの断面図(A) of the driving pulley is a front view, and (b) is a cross-sectional view taken along line EE of (a). 駆動プーリの（ａ）は走行体の駆動開始時、（ｂ）は走行体の最端位置の駆動ワイヤの状態を示す図(A) of the driving pulley is a diagram showing the state of the driving wire at the extreme end position of the traveling body, (b) at the start of driving of the traveling body. 配置の異なる駆動プーリの（ａ）は走行体の駆動開始時、（ｂ）は走行体の最端位置の駆動ワイヤの状態を示す図(A) of the driving pulleys having different arrangements is a diagram showing the state of the driving wire at the extreme end position of the traveling body, (b) is the driving start of the traveling body. 駆動プーリのフランジと駆動ワイヤの関係を示す（ａ）は正面図、（ｂ）は断面図(A) is a front view showing the relationship between the flange of the drive pulley and the drive wire, and (b) is a sectional view. 従来の駆動プーリの（ａ）は走行体の駆動開始時、（ｂ）は走行体の最端位置の駆動ワイヤの状態を示す図(A) of the conventional drive pulley is the figure which shows the state of the drive wire of the driving | running | working body at the start of driving | running | working, (b) is the extreme end position of a traveling body.

符号の説明Explanation of symbols

１ 原稿載置台
２ ランプ
３ 第１ミラー
４ 第２ミラー
５ 第３ミラー
６ 第１走行体
７ 第２走行体
８ レンズ
９ ＣＣＤ
１０ 原稿
１１，１１’ 駆動ワイヤ
１２ プーリ
１３，１３’ 屈曲部分
１４ 駆動軸
１５ 駆動プーリ
１５ａ 係止部
１６ タイミングプーリ
１７ タイミングベルト
１８ モータ
１９ スプリング
２０ 固定プーリ
２１，２１’ フランジ DESCRIPTION OF SYMBOLS 1 Document placing stand 2 Lamp 3 1st mirror 4 2nd mirror 5 3rd mirror 6 1st traveling body 7 2nd traveling body 8 Lens 9 CCD
DESCRIPTION OF SYMBOLS 10 Document 11, 11 'Drive wire 12 Pulley 13, 13' Bending part 14 Drive shaft 15 Drive pulley 15a Locking part 16 Timing pulley 17 Timing belt 18 Motor 19 Spring 20 Fixed pulleys 21, 21 'Flange

Claims (8)

駆動プーリに巻回された駆動ワイヤに可動体を接続し、前記駆動プーリの回動により前記駆動ワイヤを駆動して前記可動体を移動させる駆動装置において、
前記駆動プーリは、前記駆動ワイヤを巻き付ける側のフランジが螺旋状に厚くなることを特徴とする駆動装置。 In a drive device that connects a movable body to a drive wire wound around a drive pulley, and moves the movable body by driving the drive wire by rotation of the drive pulley,
The drive pulley is characterized in that a flange on a side around which the drive wire is wound is thickened in a spiral shape. 前記駆動プーリの螺旋状に厚くなるフランジのピッチは、駆動ワイヤの直径よりも大きいことを特徴とする請求項１記載の駆動装置。   The drive device according to claim 1, wherein a pitch of the flange of the drive pulley that is thickened in a spiral shape is larger than a diameter of the drive wire. 前記駆動ワイヤは、駆動プーリのフランジで螺旋の起点部分から内側に向かって巻き付けられていることを特徴とする請求項１または２記載の駆動装置。   The drive device according to claim 1, wherein the drive wire is wound inwardly from a spiral starting portion by a flange of a drive pulley. 前記駆動ワイヤは、駆動プーリ両端のフランジ側からそれぞれ内側に向かって逆方向に巻き付けられていることを特徴とする請求項３記載の駆動装置。   4. The drive device according to claim 3, wherein the drive wires are wound in opposite directions from the flange sides at both ends of the drive pulley toward the inside. 前記駆動プーリの螺旋状に厚くなるフランジは、前記駆動プーリの軸方向で片側に寄った前記駆動プーリから可動体に接続するために延長した駆動ワイヤの出射方向に近い側であることを特徴とする請求項３記載の駆動装置。   A flange that is thickened in a spiral shape of the drive pulley is a side close to an emission direction of a drive wire that is extended to connect to the movable body from the drive pulley that is closer to one side in the axial direction of the drive pulley. The drive device according to claim 3. 前記駆動プーリは、合成樹脂により成型されたことを特徴とする請求項１〜５のいずれか１項に記載の駆動装置。   The drive device according to claim 1, wherein the drive pulley is molded from a synthetic resin. 請求項１〜６のいずれか１項に記載の駆動装置を備え、前記駆動装置によって駆動される光学系により原稿の画像を読み取ることを特徴とする画像読取装置。   An image reading apparatus comprising the driving device according to claim 1, wherein an image of an original is read by an optical system driven by the driving device. 請求項１〜６のいずれか１項に記載の駆動装置を備え、前記駆動装置によって駆動される光学系により原稿の画像を読み取り、前記読み取った情報に基づき、記録媒体に画像を形成することを特徴とする画像形成装置。   An image of a manuscript is read by an optical system driven by the driving device, and an image is formed on a recording medium based on the read information. An image forming apparatus.
JP2007152544A 2007-06-08 2007-06-08 Driving device and image reader and image forming apparatus with the driving device Pending JP2008306536A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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EP2148114A1 (en) 2008-07-24 2010-01-27 Aichi Machine Industry Co. Ltd. Lubricating apparatus and transmission equipped with the same

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JPS57149656A (en) * 1981-03-12 1982-09-16 Konishiroku Photo Ind Co Ltd Wire reeling pulley
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JPS5521375Y2 (en) * 1972-12-28 1980-05-23
JPS57149656A (en) * 1981-03-12 1982-09-16 Konishiroku Photo Ind Co Ltd Wire reeling pulley
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EP2148114A1 (en) 2008-07-24 2010-01-27 Aichi Machine Industry Co. Ltd. Lubricating apparatus and transmission equipped with the same

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