JP2007031027A - Paper conveying device - Google Patents

Paper conveying device Download PDF

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Publication number
JP2007031027A
JP2007031027A JP2005213991A JP2005213991A JP2007031027A JP 2007031027 A JP2007031027 A JP 2007031027A JP 2005213991 A JP2005213991 A JP 2005213991A JP 2005213991 A JP2005213991 A JP 2005213991A JP 2007031027 A JP2007031027 A JP 2007031027A
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Japan
Prior art keywords
support shaft
guide member
shaft
paper
holder
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JP2005213991A
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Japanese (ja)
Inventor
Kiyonori Yamamoto
清典 山本
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Kyocera Document Solutions Inc
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Kyocera Mita Corp
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Priority to JP2005213991A priority Critical patent/JP2007031027A/en
Priority to US11/487,267 priority patent/US20070018387A1/en
Publication of JP2007031027A publication Critical patent/JP2007031027A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
    • B65H5/062—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers between rollers or balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/14—Roller pairs
    • B65H2404/143—Roller pairs driving roller and idler roller arrangement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/14—Roller pairs
    • B65H2404/144—Roller pairs with relative movement of the rollers to / from each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/15—Roller assembly, particular roller arrangement
    • B65H2404/152—Arrangement of roller on a movable frame
    • B65H2404/1521—Arrangement of roller on a movable frame rotating, pivoting or oscillating around an axis, e.g. parallel to the roller axis
    • B65H2404/15212—Arrangement of roller on a movable frame rotating, pivoting or oscillating around an axis, e.g. parallel to the roller axis rotating, pivoting or oscillating around an axis perpendicular to the roller axis

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper conveying device capable of suppressing skew of the paper even if a second guide member is not made to high strength and high accuracy. <P>SOLUTION: The paper conveying device 1 is provided with a first guide member 8 mounted with a drive roller 2; the second guide member 9 opposed to the first guide member 8; a support shaft 5 extending in a direction approximately perpendicular to a paper conveying direction and rotatably supporting a driven roller 4 at both ends; and a holder 6 for retaining the support shaft 5 movably in a direction that the driven roller 4 is opposed to the drive roller 2. Compression springs 7 for urging the support shaft 5 and pressing the driven roller 4 to the drive roller 2 are provided on the holder at both side positions relative to a center in an axial direction of the support shaft 5 respectively. The holder 6 is mounted to the second guide member 9 at a position corresponding to an approximately center in an axial direction of the support shaft 5 such that it can be pivoted making a pivot shaft 94a extending in a paper conveying direction as a fulcrum. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、画像形成装置に用いられる用紙搬送装置に関するものである。   The present invention relates to a sheet conveying device used in an image forming apparatus.

従来、用紙搬送装置としては、例えば特許文献１に記載されているように、用紙搬送方向と略直交する方向に並ぶ複数の駆動ローラと、これらの駆動ローラに対向する複数の従動ローラと、各従動ローラが取付けられるガイド部材とを備え、各従動ローラが独立してバネ部材で付勢された状態でガイド部材に取付けられたものが知られている。   Conventionally, as described in, for example, Patent Document 1, as a sheet conveying device, a plurality of driving rollers arranged in a direction substantially orthogonal to a sheet conveying direction, a plurality of driven rollers facing these driving rollers, A guide member to which a driven roller is attached is known, and each driven roller is attached to the guide member in a state of being independently biased by a spring member.

また、特許文献２には、用紙搬送方向と略直交する方向に延在し、両端部で従動ローラを回転自在に支持する支持軸と、この支持軸が取付けられるガイド部材とを備えた用紙搬送装置が記載されている。この用紙搬送装置では、ガイド部材に設けられた凸部に支持軸の中央部が宛がわれ、さらに支持軸の中央部が凸部と反対側から保持部材によって押さえ込まれることにより、支持軸が中央部を支点として揺動可能となっている。
特開平５−６９９８０号公報 特開平６−１６３０３号公報 Japanese Patent Application Laid-Open No. 2004-228667 discloses a paper transport that includes a support shaft that extends in a direction substantially orthogonal to the paper transport direction and rotatably supports the driven roller at both ends, and a guide member to which the support shaft is attached. An apparatus is described. In this paper conveying apparatus, the central portion of the support shaft is addressed to the convex portion provided on the guide member, and the central portion of the support shaft is pressed by the holding member from the opposite side to the convex portion, so that the support shaft is centered. It can be swung with the part as a fulcrum.
JP-A-5-69980 JP-A-6-16303

近年では、互いに対向してその間に用紙搬送路を形成する第１ガイド部材及び第２ガイド部材を設け、第１ガイド部材に駆動ローラを取付けるとともに、第２ガイド部材に従動ローラを取付けることが行われている。   In recent years, a first guide member and a second guide member that face each other and form a paper conveyance path are provided, and a driving roller is attached to the first guide member and a driven roller is attached to the first guide member. It has been broken.

このような構造の用紙搬送装置に、特許文献１に記載の構造を採用すると、各従動ローラが個々に第２ガイド部材に取付けられるようになるため、第１ガイド部材と第２ガイド部材とが平行になっていない場合には、従動ローラの押付力は均一にならず、その押付力の不均一によって用紙のスキューが生じるおそれがある。   When the structure described in Patent Document 1 is adopted for the paper transport device having such a structure, each driven roller is individually attached to the second guide member, and therefore the first guide member and the second guide member are separated from each other. If they are not parallel, the pressing force of the driven roller is not uniform, and the skew of the paper may be caused by the non-uniformity of the pressing force.

この用紙のスキューを抑制するには、第２ガイド部材を高強度にして第２ガイド部材の撓みを抑えるとともに、第２ガイド部材を高精度に製作して、第１ガイド部材と第２ガイド部材との平行度を保つようにする必要があり、コストアップ及び質量増を招くことになる。   In order to suppress the skew of the sheet, the second guide member is made to have high strength to suppress the bending of the second guide member, and the second guide member is manufactured with high accuracy, and the first guide member and the second guide member are manufactured. Therefore, it is necessary to maintain the parallelism with the cost, resulting in an increase in cost and an increase in mass.

また、特許文献２に記載の構造を採用すると、第１ガイド部材と第２ガイド部材とが平行になっていなくても、従動ローラは略均一の押付力で駆動ローラに押し付けられることになるが、その押付力は第１ガイド部材と第２ガイド部材との間の距離によって決まるため、第２ガイド部材を高強度にして撓みを押えるとともに、第２ガイド部材を高精度に製作して、第１ガイド部材と第２ガイド部材との平行度を保つようにする必要があることに変わりはない。   Further, when the structure described in Patent Document 2 is adopted, the driven roller is pressed against the drive roller with a substantially uniform pressing force even if the first guide member and the second guide member are not parallel. Since the pressing force is determined by the distance between the first guide member and the second guide member, the second guide member is made to have high strength to suppress the bending, and the second guide member is manufactured with high accuracy. It is still necessary to keep the parallelism between the first guide member and the second guide member.

本発明は、このような事情に鑑み、第２ガイド部材を高強度かつ高精度にしなくても用紙のスキューを抑制することができる用紙搬送装置を提供することを目的とする。   In view of such circumstances, an object of the present invention is to provide a paper transport device that can suppress paper skew even if the second guide member does not have high strength and high accuracy.

請求項１の発明は、画像形成装置に組み込まれて、用紙を搬送する用紙搬送装置であって、互いに対向してその間に用紙搬送路を形成する第１ガイド部材と第２ガイド部材を備えるとともに、第１ガイド部材に取付けられる駆動ローラと、用紙搬送方向と略直交する方向に延在し、駆動ローラに対向する従動ローラを両端部で回転自在に支持する支持軸と、この支持軸を従動ローラが駆動ローラに対向する方向に移動可能に保持するホルダーとを備え、前記ホルダーには、支持軸の軸方向中央に対して両側位置に、支持軸を付勢して従動ローラを駆動ローラに押し付ける付勢手段がそれぞれ設けられているとともに、当該ホルダーは、支持軸の軸方向略中央に対応する位置で用紙搬送方向に延在する揺動軸を支点として揺動可能となるように第２ガイド部材に取付けられていることを特徴とするものである。   According to a first aspect of the present invention, there is provided a sheet conveying apparatus that is incorporated in an image forming apparatus and conveys a sheet, and includes a first guide member and a second guide member that face each other and form a sheet conveying path therebetween. A drive roller attached to the first guide member, a support shaft extending in a direction substantially orthogonal to the paper transport direction and rotatably supporting the driven roller facing the drive roller at both ends, and the support shaft driven A holder for movably holding the roller in a direction opposite to the driving roller, and the holder urges the supporting shaft at both sides with respect to the axial center of the supporting shaft so that the driven roller becomes the driving roller. Each pressing means is provided, and the holder can swing about a swing shaft extending in the paper transport direction at a position corresponding to the substantially axial center of the support shaft. And it is characterized in that attached to the second guide member.

請求項２の発明は、請求項１に記載の用紙搬送装置において、前記ホルダーは、支持軸を駆動ローラと反対側から覆っており、当該ホルダーには、支持軸に対して付勢手段と反対側に、支持軸の飛び出しを規制する軸押え部が設けられていることを特徴とするものである。   According to a second aspect of the present invention, in the paper conveying apparatus according to the first aspect, the holder covers the support shaft from the side opposite to the drive roller, and the holder is opposite to the urging means with respect to the support shaft. On the side, a shaft pressing portion for restricting the protrusion of the support shaft is provided.

請求項３の発明は、請求項２に記載の用紙搬送装置において、前記軸押え部は、支持軸に対して用紙搬送方向の両側に設けられており、これらの軸押え部は、当該軸押え部の間に支持軸を無理嵌めできるように構成されていることを特徴とするものである。   According to a third aspect of the present invention, in the paper conveying device according to the second aspect, the shaft pressing portions are provided on both sides in the paper conveying direction with respect to the support shaft, and these shaft pressing portions are the shaft pressing portions. The support shaft is configured to be able to be forcibly fitted between the portions.

請求項４の発明は、請求項１〜３のいずれか１項に記載の用紙搬送装置において、第２ガイド部材には、ホルダーを用紙搬送方向の両側から挟み込む一対の挟持部であって用紙搬送方向に弾性変形可能な挟持部が設けられており、用紙搬送方向におけるホルダーの外側面と挟持部の内側面の一方には、前記揺動軸が突設されており、他方には、揺動軸が嵌合可能な嵌合穴が形成されていることを特徴とするものである。   According to a fourth aspect of the present invention, in the paper conveying apparatus according to any one of the first to third aspects, the second guide member is a pair of nipping portions that sandwich the holder from both sides in the paper conveying direction. There is a holding part that is elastically deformable in the direction, and the swinging shaft protrudes on one of the outer surface of the holder and the inner side surface of the holding part in the paper transport direction, and the other A fitting hole into which the shaft can be fitted is formed.

請求項５の発明は、請求項４に記載の用紙搬送装置において、前記嵌合穴は、従動ローラが駆動ローラに対向する方向に並んで複数箇所に設けられていることを特徴とするものである。   According to a fifth aspect of the present invention, in the paper conveying apparatus according to the fourth aspect, the fitting hole is provided at a plurality of locations side by side in a direction in which the driven roller faces the driving roller. is there.

請求項６の発明は、請求項１〜５のいずれか１項に記載の用紙搬送装置が組み込まれたことを特徴とする画像形成装置である。   A sixth aspect of the present invention is an image forming apparatus in which the paper conveying device according to any one of the first to fifth aspects is incorporated.

請求項１の発明によれば、第２ガイド部材と第１ガイド部材とが平行になっていなくても、支持軸の軸方向略中央に対応する位置でホルダーが揺動して、駆動ローラと従動ローラとの平行度が保たれるとともに、支持軸の軸方向中央に対して両側位置で支持軸が付勢手段で付勢されて、支持軸の両端部に支持された従動ローラが略均等な押付力で駆動ローラに押し付けられるようになるので、用紙のスキューを抑制することができる。しかも、支持軸はホルダーに所定方向（従動ローラが駆動ローラに対向する方向）に移動可能に保持されているので、第２ガイド部材に振動が生じてホルダーが振動したとしても、その振動を付勢手段で吸収して支持軸に伝わらせないようにすることができ、従動ローラの押付力の均一性を保つことができる。すなわち、第２ガイド部材の強度を下げることが可能となり、材料軽減によるコストダウン及び軽量化を図ることができるとともに、第２ガイド部材を高精度で製作する必要がなくなり、製作歩留まりを向上させることができる。   According to the first aspect of the present invention, even if the second guide member and the first guide member are not parallel, the holder swings at a position corresponding to the substantially axial center of the support shaft, The parallelism with the driven roller is maintained, and the support shaft is urged by the urging means at both side positions with respect to the axial center of the support shaft so that the driven rollers supported at both ends of the support shaft are substantially equal. Since the sheet is pressed against the driving roller with a small pressing force, the skew of the sheet can be suppressed. In addition, since the support shaft is held by the holder so as to be movable in a predetermined direction (direction in which the driven roller faces the drive roller), even if the second guide member vibrates and the holder vibrates, the vibration is applied. It can be absorbed by the urging means and not transmitted to the support shaft, and the pressing force of the driven roller can be kept uniform. That is, the strength of the second guide member can be reduced, the cost can be reduced and the weight can be reduced by reducing the material, and it is not necessary to manufacture the second guide member with high accuracy, thereby improving the production yield. Can do.

請求項２の発明によれば、簡単な形状でホルダーが支持軸を所定方向に移動可能に保持することができるとともに、軸押え部によって支持軸の飛び出しが規制されるので、支持軸を組み込んだホルダーをユニットとして取扱うことが可能となり、組立て効率を向上させることができる。   According to the second aspect of the present invention, the holder can hold the support shaft so as to be movable in a predetermined direction with a simple shape, and the protrusion of the support shaft is restricted by the shaft pressing portion, so that the support shaft is incorporated. The holder can be handled as a unit, and the assembly efficiency can be improved.

請求項３の発明によれば、ワンタッチで支持軸をホルダーに保持させることができる。   According to the invention of claim 3, the support shaft can be held by the holder with one touch.

請求項４の発明によれば、ワンタッチでホルダーを第２ガイド部材に取付けることができる。   According to the invention of claim 4, the holder can be attached to the second guide member with one touch.

請求項５の発明によれば、揺動軸を嵌合させる位置を変えるだけで従動ローラの押付力を調整することができる。   According to the invention of claim 5, the pressing force of the driven roller can be adjusted only by changing the position where the swing shaft is fitted.

請求項６の発明によれば、画像形成装置において前記効果を得ることができる。   According to the invention of claim 6, the effect can be obtained in the image forming apparatus.

以下、本発明を実施するための最良の形態について、図面を参照しながら詳細に説明する。   Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

図１に、本発明の一実施形態に係る用紙搬送装置１が組み込まれた画像形成装置の一例であるプリンタ１０を示す。なお、用紙搬送装置１は、プリンタ１０に限らず、複写機やファクシミリ装置、複合機等の他の画像形成装置にも組み込むことが可能である。   FIG. 1 shows a printer 10 which is an example of an image forming apparatus in which a sheet conveying apparatus 1 according to an embodiment of the present invention is incorporated. The sheet conveying apparatus 1 can be incorporated not only in the printer 10 but also in other image forming apparatuses such as a copying machine, a facsimile machine, and a multifunction machine.

前記プリンタ１０は、搬送路Ｌに沿って用紙を搬送する途中で、端末等から送られた画像データに基づいて用紙に画像を形成するものであり、箱状の筐体１５の内部に、感光体ドラム１３１の表面にトナー像を形成した後にそのトナー像を用紙に転写する画像形成部１３と、画像形成部１３に用紙を供給する給紙部１２と、トナー像を用紙に定着する定着部１６とを備えている。   The printer 10 forms an image on a sheet based on image data sent from a terminal or the like in the middle of conveying the sheet along the conveyance path L. An image forming unit 13 that forms a toner image on the surface of the body drum 131 and then transfers the toner image to a sheet; a paper feeding unit 12 that supplies the sheet to the image forming unit 13; and a fixing unit that fixes the toner image to the sheet 16.

前記搬送路Ｌは、前方から後方に略水平に延びる水平部Ｌ１と、水平部Ｌ１の後端部から略垂直に立上る垂直部Ｌ２とを有し、側面視で略Ｌ字状をなしている。   The conveyance path L has a horizontal portion L1 extending substantially horizontally from the front to the rear and a vertical portion L2 rising substantially vertically from the rear end portion of the horizontal portion L1, and has a substantially L shape in a side view. Yes.

前記給紙部１２は、搬送路Ｌの水平部Ｌ１の下方に配設される給紙カセット１２１を有しており、給紙カセット１２１に収納された用紙をピックアップローラ１２ａによって取出すとともに、その用紙を給紙ローラ１２ｂ〜１２ｅによって１枚ずつ搬送路Ｌの水平部Ｌ１に送り出し、さらに搬送路Ｌに送り出された用紙を、レジストローラ１２ｆによって一旦待機させ、所定のタイミングで画像形成部１３に供給するようになっている。   The paper feed unit 12 has a paper feed cassette 121 disposed below the horizontal portion L1 of the transport path L. The paper stored in the paper feed cassette 121 is taken out by a pickup roller 12a and the paper is Are fed one by one to the horizontal portion L1 of the conveyance path L by the paper feed rollers 12b to 12e, and the sheet fed to the conveyance path L is temporarily waited by the registration rollers 12f and supplied to the image forming unit 13 at a predetermined timing. It is supposed to be.

また、給紙部１２は、筐体１５の前面に取付けられる手差しトレイ１２２をも有しており、手差しトレイ１２２に載置された用紙をピックアップローラ１２ｇによって取出すとともに、その用紙を給紙ローラ１２ｃ，１２ｅによって１枚ずつ搬送路Ｌの水平部Ｌ１に送り出すことが可能となっている。   The paper feed unit 12 also has a manual feed tray 122 attached to the front surface of the housing 15. The paper placed on the manual feed tray 122 is taken out by the pickup roller 12 g and the paper is fed by the paper feed roller 12 c. , 12e can be sent one by one to the horizontal portion L1 of the transport path L.

前記画像形成部１３は、搬送路Ｌの水平部Ｌ１の前後方向の略中央に配設される感光体ドラム１３１と、感光体ドラム１３１の上方に配設される帯電部１３２と、感光体ドラム１３１の前方に配設される現像部１３３と、感光体ドラム１３１の下方に配設される転写部１３４と、感光体ドラム１３１の後方に配設されるクリーニング部１３５と、帯電部１３２及びクリーニング部１３５並びに前記定着部１６の上方に配設されるレーザースキャナユニット（ＬＳＵ）１４とを有している。   The image forming unit 13 includes a photosensitive drum 131 disposed substantially at the center in the front-rear direction of the horizontal portion L1 of the conveyance path L, a charging unit 132 disposed above the photosensitive drum 131, and a photosensitive drum. A developing unit 133 disposed in front of 131, a transfer unit 134 disposed below the photosensitive drum 131, a cleaning unit 135 disposed behind the photosensitive drum 131, a charging unit 132, and a cleaning unit. And a laser scanner unit (LSU) 14 disposed above the fixing unit 16.

前記感光体ドラム１３１は、図１において時計回りに回転するようになっており、その表面には、当該表面が帯電部１３２によって一様に帯電された後に、レーザースキャナユニット１４によって画像データに基づくレーザー光が帯電部１３２と現像部１３３との間から照射されることにより静電潜像が形成され、さらに静電潜像が形成された表面に、現像部１３３からトナーが供給されることによってトナー像が形成されるようになっている。   The photosensitive drum 131 rotates clockwise in FIG. 1, and the surface of the photosensitive drum 131 is based on image data by the laser scanner unit 14 after the surface is uniformly charged by the charging unit 132. An electrostatic latent image is formed by irradiating laser light from between the charging unit 132 and the developing unit 133, and toner is supplied from the developing unit 133 to the surface on which the electrostatic latent image is formed. A toner image is formed.

そして、前記給紙部１２から供給された用紙は、転写部１３４の転写ローラ１３４ａによって感光体ドラム１３１に押付けられながら搬送されることにより、その表面（転写面）に、感光体ドラム１３１の表面に形成されたトナー像が転写され、その後に定着部１６に送り込まれる。   The paper supplied from the paper supply unit 12 is conveyed while being pressed against the photoconductive drum 131 by the transfer roller 134a of the transfer unit 134, so that the surface of the photoconductive drum 131 is transferred to the surface (transfer surface). The toner image formed on the toner image is transferred and then sent to the fixing unit 16.

なお、転写後の感光体ドラム１３１の表面に残留したトナー及び残留電荷は、クリーニング部１３５によって除去されるようになっている。   The toner and residual charge remaining on the surface of the photosensitive drum 131 after the transfer are removed by the cleaning unit 135.

前記定着部１６は、ヒートローラ１６ａと、圧力ローラ１６ｂとを有しており、これらのローラ１６ａ，１６ｂでトナー像が転写された用紙を挟み込むことにより、熱と圧力とでトナー像を用紙に定着するようになっている。   The fixing unit 16 includes a heat roller 16a and a pressure roller 16b. The toner image is transferred to the paper by heat and pressure by sandwiching the paper on which the toner image is transferred by the rollers 16a and 16b. It has become established.

そして、トナー像が定着された用紙は、排出ローラ１８によって筐体１５の上面に形成された排出部１９に排出される。   The sheet on which the toner image is fixed is discharged by a discharge roller 18 to a discharge unit 19 formed on the upper surface of the housing 15.

なお、本実施形態のプリンタ１０では、搬送路Ｌの水平部Ｌ１と給紙カセット１２１との間に、スイッチバック部１７が設けられており、用紙の両面に画像を形成できるようになっている。   In the printer 10 of the present embodiment, the switchback unit 17 is provided between the horizontal portion L1 of the transport path L and the paper feed cassette 121 so that images can be formed on both sides of the paper. .

そして、前記用紙搬送装置１は、定着部１６と排出ローラ１８との間に配設されているとともに、スイッチバック部１７の搬送路Ｌ’に沿っても配設されている。   The sheet conveying device 1 is disposed between the fixing unit 16 and the discharge roller 18 and is also disposed along the conveying path L ′ of the switchback unit 17.

用紙搬送装置１は、図２〜図５に示すように、搬送路ＬまたはＬ’（以下、単に搬送路Ｌという）を挟んで互いに対向する第１ガイド部材８と第２ガイド部材９を有している。   As shown in FIGS. 2 to 5, the sheet transport apparatus 1 includes a first guide member 8 and a second guide member 9 that face each other across a transport path L or L ′ (hereinafter simply referred to as a transport path L). is doing.

第１ガイド部材８は、樹脂等で構成されており、搬送路Ｌに沿って扁平な略矩形板状をなしている。   The first guide member 8 is made of resin or the like and has a flat, substantially rectangular plate shape along the transport path L.

第２ガイド部材９は、板金をプレス加工する等して形成されたものであり、第１ガイド部材８に対向する略矩形状のメインプレート９１と、メインプレート９１の用紙搬送方向（以下、Ｘ方向という）の端部から当該メインプレート９１の略全長に亘ってＸ方向と略直交する方向（以下、Ｚ方向という）に沿って第１ガイド部材８から遠ざかる方向（以下、Ｚ方向下向きという）に延在するエンドプレート９２と、メインプレート９１の搬送路Ｌに沿ってＸ方向と略直交する方向（以下、Ｙ方向という）の両端部からＺ方向下向きにそれぞれ延在するサイドプレート９３とを有している。そして、メインプレート９１と第１ガイド部材８との間に搬送路Ｌが形成されている。   The second guide member 9 is formed by, for example, pressing a sheet metal, and has a substantially rectangular main plate 91 facing the first guide member 8 and a sheet conveyance direction (hereinafter referred to as X hereinafter) of the main plate 91. Direction from the first guide member 8 along the direction substantially orthogonal to the X direction (hereinafter referred to as Z direction) from the end of the main plate 91 over the substantially entire length of the main plate 91 (hereinafter referred to as Z direction downward). And end plates 92 extending sideways, and side plates 93 respectively extending downward in the Z direction from both ends in a direction substantially perpendicular to the X direction (hereinafter referred to as the Y direction) along the conveyance path L of the main plate 91. Have. A conveyance path L is formed between the main plate 91 and the first guide member 8.

また、用紙搬送装置１は、Ｙ方向における搬送路Ｌの中心から略均等な位置に配設される２つの駆動ローラ２と、これらの駆動ローラ２とＺ方向で対向する２つの従動ローラ４とを有している。   Further, the sheet conveying apparatus 1 includes two driving rollers 2 disposed at substantially equal positions from the center of the conveying path L in the Y direction, and two driven rollers 4 facing these driving rollers 2 in the Z direction. have.

駆動ローラ２は、ゴム等で構成されており、Ｙ方向に延在する駆動軸３に貫通された状態で固定されている。この駆動軸３は、第１ガイド部材８の搬送路Ｌに臨む面と反対側の面に取付けられた支持部材（図示せず）によって回転自在に支持されており、図略の駆動源によって所定の回転数で回転させられるようになっている。また、第１ガイド部材８には、駆動ローラ２に対応する位置に、窓８２が設けられており、この窓８２を通じて駆動ローラ２の一部が搬送路Ｌ内に入り込んでいる。   The drive roller 2 is made of rubber or the like, and is fixed in a state of being penetrated by the drive shaft 3 extending in the Y direction. The drive shaft 3 is rotatably supported by a support member (not shown) attached to the surface opposite to the surface facing the conveyance path L of the first guide member 8, and is predetermined by a drive source (not shown). It can be rotated at the number of rotations. Further, the first guide member 8 is provided with a window 82 at a position corresponding to the drive roller 2, and a part of the drive roller 2 enters the conveyance path L through the window 82.

従動ローラ４は、樹脂等で構成されており、円形筒状をなしている。そして、従動ローラ４は、Ｙ方向に延在する円形棒状の支持軸５の両端部に嵌合することにより、支持軸５の両端部に回転自在に支持されている。支持軸５は、ホルダー６に保持されており、ホルダー６は、第２ガイド部材９のメインプレート９１の搬送路Ｌに臨む面と反対側の面に取付けられている。第２ガイド部材９のメインプレート９１には、従動ローラ４に対応する位置に窓９５が設けられており、この窓９５を通じて従動ローラ４の一部が搬送路Ｌ内に入り込み、駆動ローラ２と当接可能となっている。   The driven roller 4 is made of resin or the like and has a circular cylindrical shape. The driven roller 4 is rotatably supported at both ends of the support shaft 5 by fitting into both ends of the circular rod-shaped support shaft 5 extending in the Y direction. The support shaft 5 is held by a holder 6, and the holder 6 is attached to a surface of the second guide member 9 opposite to the surface facing the conveyance path L of the main plate 91. The main plate 91 of the second guide member 9 is provided with a window 95 at a position corresponding to the driven roller 4, and a part of the driven roller 4 enters the conveyance path L through the window 95, Contact is possible.

前記ホルダー６は、図７に示すように、Ｙ方向に延びる長方形筒状の断面形状でＺ方向に延びる周壁６１と、周壁６１のメインプレート９１と反対側の開口を塞ぐ底壁６２とを有し、Ｚ方向下向きと反対方向（以下、Ｚ方向上向きという）に開口する容器状をなしている。このホルダー６のＹ方向の寸法は、従動ローラ４が離間する距離よりも僅かに小さく設定されていて、ホルダー６が従動ローラ４の間に入り込み可能となっている。また、ホルダー６の内部には、Ｙ方向の両端部から少し内側に入った位置にリブ６３が底壁６２から立ち上がっており、このリブ６３によって周壁６１の長手側同士が連結されている。   As shown in FIG. 7, the holder 6 has a peripheral wall 61 extending in the Z direction with a rectangular cylindrical cross section extending in the Y direction, and a bottom wall 62 closing the opening on the opposite side of the peripheral wall 61 from the main plate 91. The container is open in the opposite direction to the Z direction downward (hereinafter referred to as the Z direction upward). The dimension of the holder 6 in the Y direction is set to be slightly smaller than the distance at which the driven roller 4 is separated, so that the holder 6 can enter between the driven rollers 4. Further, a rib 63 rises from the bottom wall 62 at a position slightly inward from both ends in the Y direction inside the holder 6, and the long sides of the peripheral wall 61 are connected to each other by the rib 63.

さらに、ホルダー６は、Ｙ方向から見たときにＺ方向上向きに開口する形状となるように、周壁６１の短手側及びリブ６３には、略Ｕ字状の凹部６１ａ，６３ａが形成されている。この凹部６１ａ，６３ａの幅は、支持軸５の直径と略同寸法に設定されている。そして、この凹部６１ａ，６３ａに支持軸５が嵌り込むことにより、支持軸５が駆動ローラ２と反対側からホルダー６に覆われた状態で、ホルダー６にＺ方向に移動可能に保持されている。   Furthermore, substantially U-shaped recesses 61a and 63a are formed on the short side of the peripheral wall 61 and the rib 63 so that the holder 6 has a shape that opens upward in the Z direction when viewed from the Y direction. Yes. The widths of the recesses 61 a and 63 a are set to be approximately the same as the diameter of the support shaft 5. The support shaft 5 is fitted into the recesses 61a and 63a, so that the support shaft 5 is held by the holder 6 so as to be movable in the Z direction while being covered by the holder 6 from the opposite side to the drive roller 2. .

なお、支持軸５のＹ方向の外側には、窓９５の縁部からＺ方向下向きに垂れ下がる垂下片９５ａが設けられており、この垂下片９５ａが支持軸５の端面と対向して、支持軸５のＹ方向の移動が規制されている。この垂下片９５ａは、窓９５を形成する際に、メインプレート９１の窓９５の領域に入る部分がＺ方向下向きに切り起こされて形成されたものである。   A drooping piece 95a that hangs downward in the Z direction from the edge of the window 95 is provided outside the support shaft 5 in the Y direction, and the drooping piece 95a faces the end surface of the support shaft 5 to support the support shaft 5. 5 is restricted from moving in the Y direction. When the window 95 is formed, the hanging piece 95a is formed by cutting and raising a portion of the main plate 91 that enters the window 95 region downward in the Z direction.

また、リブ６３と周壁６１の短手側との間には、それぞれ圧縮バネ７が配設されており、支持軸５がホルダー６に保持されたときには、この圧縮バネ７によって支持軸５の軸方向中央に対して両側位置がＺ方向上向きに付勢され、従動ローラ４が駆動ローラ２に押し付けられるようになっている。なお、ホルダー６の底壁６２には、リブ６３と周壁６１の短手側との間に、圧縮バネ７をガイドする円柱状のガイド部６２ａが突設されている。   Further, compression springs 7 are respectively disposed between the ribs 63 and the short side of the peripheral wall 61, and when the support shaft 5 is held by the holder 6, the shaft of the support shaft 5 is supported by the compression spring 7. Both side positions are urged upward in the Z direction with respect to the center in the direction, and the driven roller 4 is pressed against the driving roller 2. A cylindrical guide portion 62 a that guides the compression spring 7 protrudes from the bottom wall 62 of the holder 6 between the rib 63 and the short side of the peripheral wall 61.

周壁６１の長手側におけるＹ方向中央のそれぞれには、周壁６１からＺ方向上向きに突出する突出部６６が形成されているとともに、Ｘ方向における周壁６１及び突出部６６の両内側面には、Ｚ方向に延在するリブ６４がそれぞれ設けられている。リブ６４のＸ方向の幅は、リブ６４同士の間の寸法が支持軸５の直径よりも大きくなるように設定されている。また、リブ６４のＸ方向の端面のそれぞれには、Ｚ方向上向き側の端部に、互いに対向するように突出する軸押え部６４ａが設けられており、これにより支持軸５がホルダー６から飛び出さないようになっている。なお、軸押え部６４ａの間には支持軸５を無理嵌めできるようになっている。すなわち、軸押え部６４ａの間に外方から支持軸５を押し込んだときには、周壁６１が弾性変形して両軸押え部６４ａがＸ方向の両側に押し広げられ、当該軸押え部６４ａの間を支持軸５が通過可能となる。   Projection portions 66 projecting upward in the Z direction from the peripheral wall 61 are formed at the center in the Y direction on the longitudinal side of the peripheral wall 61, and both inner side surfaces of the peripheral wall 61 and the projection portion 66 in the X direction are formed on both inner surfaces. Ribs 64 extending in the direction are provided. The width in the X direction of the ribs 64 is set so that the dimension between the ribs 64 is larger than the diameter of the support shaft 5. Each of the end surfaces in the X direction of the ribs 64 is provided with shaft pressing portions 64a that protrude so as to face each other at the end portions on the Z direction upward side, so that the support shaft 5 protrudes from the holder 6. It is supposed not to. The support shaft 5 can be forcibly fitted between the shaft pressing portions 64a. That is, when the support shaft 5 is pushed in between the shaft pressing portions 64a from the outside, the peripheral wall 61 is elastically deformed so that the both shaft pressing portions 64a are spread out on both sides in the X direction, and the space between the shaft pressing portions 64a. The support shaft 5 can pass through.

さらに、Ｘ方向における周壁６１及び突出部６６の両外側面には、Ｚ方向に並ぶ２つの嵌合穴６５ａを有し、Ｘ方向から見たときに略８の字状のボス６５がそれぞれ突設されている。   Further, both outer surfaces of the peripheral wall 61 and the projecting portion 66 in the X direction have two fitting holes 65a arranged in the Z direction, and when viewed from the X direction, approximately 8-shaped bosses 65 project. It is installed.

一方、第２ガイド部材９には、Ｙ方向における搬送路Ｌの略中心に対応する位置、換言すれば、支持軸５の軸方向略中央に対応する位置に、ホルダー６をＸ方向の両側から挟み込む一対の挟持部９４が設けられている。この挟持部９４は、メインプレート９１のＸ方向に並ぶ部分が互いに対向するようにＺ方向下向きに切起こされて形成されたものであり、Ｘ方向に弾性変形可能となっている。すなわち、両挟持部９４を押し広げることが可能であり、その状態で手を離せば当該挟持部９４の復元力によって挟持部９４が元の位置に復帰するようになる。そして、挟持部９４の両内側面には、Ｘ方向に延在し、ホルダー６のボス６５の嵌合穴６５ａに嵌合可能な揺動軸９４ａがそれぞれ突設されており、この揺動軸９４ａが嵌合穴６５ａに嵌合することにより、ホルダー６が揺動軸９４ａを支点として揺動可能となっている。   On the other hand, on the second guide member 9, the holder 6 is moved from both sides in the X direction to a position corresponding to the approximate center of the transport path L in the Y direction, in other words, to a position corresponding to the approximate center of the support shaft 5 in the axial direction. A pair of sandwiching portions 94 for sandwiching is provided. The sandwiching portion 94 is formed by being cut and raised downward in the Z direction so that the portions of the main plate 91 aligned in the X direction face each other, and can be elastically deformed in the X direction. That is, it is possible to push the both clamping parts 94 apart, and if the hand is released in this state, the clamping parts 94 will return to their original positions by the restoring force of the clamping parts 94. Further, on both inner side surfaces of the clamping portion 94, swing shafts 94a extending in the X direction and capable of being fitted into the fitting holes 65a of the boss 65 of the holder 6 are respectively projected. By fitting 94a into the fitting hole 65a, the holder 6 can swing about the swinging shaft 94a.

このような構成の用紙搬送装置１であれば、第２ガイド部材９と第１ガイド部材８とが平行になっていなくても、支持軸５の軸方向略中央に対応する位置にある揺動軸９４ａを支点としてホルダー６が揺動して、駆動ローラ２と従動ローラ４との平行度が保たれるとともに、支持軸５が軸方向中央の両側位置で圧縮バネ７によって付勢されて、支持軸５の両端部に支持された従動ローラ４が略均等な押付力で駆動ローラ２に押し付けられるようになるので、用紙のスキューを抑制することができる。しかも、支持軸５はホルダー６にＺ方向に移動可能に保持されているので、第２ガイド部材９に振動が生じてホルダー６が振動したとしても、その振動を圧縮バネ７で吸収して支持軸５に伝わらせないようにすることができ、従動ローラ４の押付力の均一性を保つことができる。すなわち、第２ガイド部材９の強度を下げることが可能となり、材料軽減によるコストダウン及び軽量化を図ることができるとともに、第２ガイド部材９を高精度で製作する必要がなくなり、製作歩留まりを向上させることができる。   In the case of the sheet conveying apparatus 1 having such a configuration, even if the second guide member 9 and the first guide member 8 are not parallel to each other, the swing is located at a position corresponding to the substantially axial center of the support shaft 5. The holder 6 swings with the shaft 94a as a fulcrum, the parallelism between the driving roller 2 and the driven roller 4 is maintained, and the support shaft 5 is urged by the compression springs 7 at both axially central positions. Since the driven roller 4 supported at both ends of the support shaft 5 is pressed against the driving roller 2 with a substantially uniform pressing force, the skew of the paper can be suppressed. Moreover, since the support shaft 5 is held by the holder 6 so as to be movable in the Z direction, even if the second guide member 9 vibrates and the holder 6 vibrates, the vibration is absorbed by the compression spring 7 and supported. It can be prevented from being transmitted to the shaft 5, and the pressing force of the driven roller 4 can be kept uniform. That is, the strength of the second guide member 9 can be reduced, the cost can be reduced and the weight can be reduced by reducing the material, and the second guide member 9 need not be manufactured with high accuracy, thereby improving the manufacturing yield. Can be made.

また、ホルダー６は、支持軸５を駆動ローラ２と反対側から覆う形状となっているので、簡単な形状でホルダー６が支持軸５をＺ方向に移動可能に保持することができるとともに、ホルダー６には、支持軸５の飛び出しを規制する軸押え部６４ａが設けられているので、支持軸５を組み込んだホルダー６をユニットとして取扱うことが可能となり、組立て効率を向上させることができる。   Further, since the holder 6 has a shape that covers the support shaft 5 from the side opposite to the drive roller 2, the holder 6 can hold the support shaft 5 in a simple shape so as to be movable in the Z direction. 6 is provided with a shaft pressing portion 64a for restricting the protrusion of the support shaft 5, the holder 6 incorporating the support shaft 5 can be handled as a unit, and the assembly efficiency can be improved.

さらに、軸押え部６４ａの間には支持軸５を無理嵌めできるようになっているので、ワンタッチで支持軸５をホルダー６に保持させることができる。   Furthermore, since the support shaft 5 can be forcibly fitted between the shaft pressing portions 64a, the support shaft 5 can be held by the holder 6 with one touch.

また、内側面に揺動軸９４ａが突設された挟持部９４は、Ｘ方向に弾性変形可能となっているので、ワンタッチでホルダー６を第２ガイド部材９に取付けることができる。   Further, the holding portion 94 having the swing shaft 94a projecting on the inner surface is elastically deformable in the X direction, so that the holder 6 can be attached to the second guide member 9 with one touch.

さらに、揺動軸９４ａが係合可能な嵌合穴６５ａは、Ｚ方向に並んで２箇所に設けられているので、揺動軸９４ａを嵌合させる位置を変えるだけで従動ローラ４の押付力を調整することができる。   Further, since the fitting holes 65a with which the swing shaft 94a can be engaged are provided at two locations side by side in the Z direction, the pressing force of the driven roller 4 can be changed only by changing the position where the swing shaft 94a is fitted. Can be adjusted.

なお、前記実施形態では、軸押え部６４ａをリブ６４の双方に設けているが、一方のリブ６４にのみ設けることも可能である。   In addition, in the said embodiment, although the shaft pressing part 64a was provided in both the ribs 64, it is also possible to provide only in one rib 64. FIG.

また、前記実施形態では、圧縮バネ７で支持軸５を付勢しているが、圧縮バネ７に代えて、例えば弾性変形による復元力で支持軸５を付勢する付勢手段を採用することも可能である。   In the above-described embodiment, the support shaft 5 is urged by the compression spring 7. Instead of the compression spring 7, for example, an urging unit that urges the support shaft 5 with a restoring force by elastic deformation is employed. Is also possible.

さらに、揺動軸９４ａをＸ方向におけるホルダー６の両外側面に突設するとともに、嵌合穴６５ａをＸ方向における挟持部９４の両内側面に形成してもよい。   Further, the swing shaft 94a may be provided so as to protrude from both outer side surfaces of the holder 6 in the X direction, and the fitting hole 65a may be formed on both inner side surfaces of the holding portion 94 in the X direction.

また、駆動ローラ２の数は、２つである必要はなく、４つであってもよい。この場合には、中央の駆動ローラ２つに対向する位置に従動ローラ４を配置してもよいし、または、両端部で従動ローラ４を支持した支持軸５及びホルダー６を２セットＹ方向に並べて配設してもよい。また、駆動ローラが６つ以上の場合は、支持軸５及びホルダー６を３セットとすることも可能である。   Further, the number of drive rollers 2 need not be two and may be four. In this case, the driven roller 4 may be disposed at a position facing the two central driving rollers, or the support shaft 5 and the holder 6 that support the driven roller 4 at both ends are arranged in two sets in the Y direction. They may be arranged side by side. When there are six or more drive rollers, the support shaft 5 and the holder 6 can be made into three sets.

本発明の一実施形態に係る用紙搬送装置が組み込まれたプリンタの構成を示す側面図である。1 is a side view illustrating a configuration of a printer in which a paper conveying device according to an embodiment of the present invention is incorporated. 用紙搬送装置を用紙搬送方向の上流側から見たときの斜視図である。FIG. 6 is a perspective view of the paper transport device as viewed from the upstream side in the paper transport direction. 用紙搬送装置の第１ガイド部材及び第２ガイド部材を省略した斜視図である。FIG. 6 is a perspective view in which a first guide member and a second guide member of the paper transport device are omitted. 図２のＩＶ−ＩＶ線断面図である。It is the IV-IV sectional view taken on the line of FIG. 図４のＶ−Ｖ線断面図である。It is the VV sectional view taken on the line of FIG. 第２ガイド部材の斜視図である。It is a perspective view of the 2nd guide member. ホルダーの斜視図である。It is a perspective view of a holder.

符号の説明Explanation of symbols

１ 用紙搬送装置
２ 駆動ローラ
３ 駆動軸
４ 従動ローラ
５ 支持軸
６ ホルダー
６４ａ 軸押え部
６５ａ 係合穴
７ 圧縮バネ
８ 第１ガイド部材
９ 第２ガイド部材
９４ 挟持部
９４ａ 揺動軸
１０ プリンタ（画像形成装置） DESCRIPTION OF SYMBOLS 1 Paper conveying apparatus 2 Drive roller 3 Drive shaft 4 Drive roller 5 Support shaft 6 Holder 64a Shaft pressing part 65a Engagement hole 7 Compression spring 8 1st guide member 9 2nd guide member 94 Clamping part 94a Oscillation shaft 10 Printer (image) Forming equipment)

Claims (6)

画像形成装置に組み込まれて、用紙を搬送する用紙搬送装置であって、
互いに対向してその間に用紙搬送路を形成する第１ガイド部材と第２ガイド部材を備えるとともに、第１ガイド部材に取付けられる駆動ローラと、用紙搬送方向と略直交する方向に延在し、駆動ローラに対向する従動ローラを両端部で回転自在に支持する支持軸と、この支持軸を従動ローラが駆動ローラに対向する方向に移動可能に保持するホルダーとを備え、
前記ホルダーには、支持軸の軸方向中央に対して両側位置に、支持軸を付勢して従動ローラを駆動ローラに押し付ける付勢手段がそれぞれ設けられているとともに、当該ホルダーは、支持軸の軸方向略中央に対応する位置で用紙搬送方向に延在する揺動軸を支点として揺動可能となるように第２ガイド部材に取付けられていることを特徴とする用紙搬送装置。 A paper conveyance device that is incorporated in an image forming apparatus and conveys paper,
A first guide member and a second guide member that face each other and form a paper transport path therebetween, and that are driven by a drive roller attached to the first guide member and extending in a direction substantially orthogonal to the paper transport direction A support shaft that rotatably supports the driven roller facing the roller at both ends, and a holder that holds the support shaft so that the driven roller can move in a direction facing the drive roller;
The holder is provided with urging means for urging the support shaft and pressing the driven roller against the drive roller at both side positions with respect to the axial center of the support shaft. A paper transporting device, wherein the paper transporting device is attached to the second guide member so as to be swingable about a swinging shaft extending in the paper transporting direction at a position corresponding to substantially the center in the axial direction. 前記ホルダーは、支持軸を駆動ローラと反対側から覆っており、当該ホルダーには、支持軸に対して付勢手段と反対側に、支持軸の飛び出しを規制する軸押え部が設けられていることを特徴とする請求項１に記載の用紙搬送装置。   The holder covers the support shaft from the side opposite to the drive roller, and the holder is provided with a shaft pressing portion that regulates the protrusion of the support shaft on the side opposite to the biasing means with respect to the support shaft. The sheet conveying apparatus according to claim 1. 前記軸押え部は、支持軸に対して用紙搬送方向の両側に設けられており、これらの軸押え部は、当該軸押え部の間に支持軸を無理嵌めできるように構成されていることを特徴とする請求項２に記載の用紙搬送装置。   The shaft pressing portions are provided on both sides of the support shaft in the sheet conveying direction, and these shaft pressing portions are configured so that the supporting shaft can be forcibly fitted between the shaft pressing portions. The sheet conveying apparatus according to claim 2, wherein 第２ガイド部材には、ホルダーを用紙搬送方向の両側から挟み込む一対の挟持部であって用紙搬送方向に弾性変形可能な挟持部が設けられており、用紙搬送方向におけるホルダーの外側面と挟持部の内側面の一方には、前記揺動軸が突設されており、他方には、揺動軸が嵌合可能な嵌合穴が形成されていることを特徴とする請求項１〜３のいずれか１項に記載の用紙搬送装置。   The second guide member is provided with a pair of sandwiching portions that sandwich the holder from both sides in the paper transport direction and is elastically deformable in the paper transport direction. The swinging shaft protrudes from one of the inner side surfaces of the inner surface, and the other has a fitting hole into which the swinging shaft can be fitted. The paper conveying apparatus of any one of Claims. 前記嵌合穴は、従動ローラが駆動ローラに対向する方向に並んで複数箇所に設けられていることを特徴とする請求項４に記載の用紙搬送装置。   5. The sheet conveying device according to claim 4, wherein the fitting holes are provided at a plurality of positions side by side in a direction in which the driven roller faces the driving roller. 請求項１〜５のいずれか１項に記載の用紙搬送装置が組み込まれたことを特徴とする画像形成装置。   An image forming apparatus in which the paper conveying device according to claim 1 is incorporated.
JP2005213991A 2005-07-25 2005-07-25 Paper conveying device Pending JP2007031027A (en)

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