JP2005060089A - Paper conveyance device - Google Patents

Paper conveyance device Download PDF

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JP2005060089A
JP2005060089A JP2003295877A JP2003295877A JP2005060089A JP 2005060089 A JP2005060089 A JP 2005060089A JP 2003295877 A JP2003295877 A JP 2003295877A JP 2003295877 A JP2003295877 A JP 2003295877A JP 2005060089 A JP2005060089 A JP 2005060089A
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stopper
roller
paper
bearing
rollers
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JP4073377B2 (en
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Shinichi Uchida
進一 内田
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Kyocera Document Solutions Inc
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Kyocera Mita Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper conveyance device capable of nipping a paper sheet between a pair of rollers rotating in a pressure contact condition to convey it and adjusting parallelism of a roller shaft by a simple mechanism without adding a member. <P>SOLUTION: This paper conveyance device is provided with a bearing 2 supporting a regist roller 1a, a spring 4 energizing the regist roller 1a, and a stopper 3 in which a cutout part 31 is formed upward from a lower side when viewed in front, an upper limit position of the roller 1a energized by the spring 4 is regulated, and positioning of the bearing 2 in the direction of conveyance of paper sheet is performed by fitting and inserting the bearing 2 into the cutout part 31. A central line L<SB>2</SB>between inner side faces of the cutout part 31 for positioning the bearing 2 is separated from a central line L<SB>1</SB>between outer side faces of the stopper 3 in the direction of paper conveyance, and the direction for attaching the stopper 3 is changed to adjust parallelism of a pair of regist rollers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は用紙搬送装置に関し、より詳細には圧接状態で回転する一対のローラ間で用紙を挟持して搬送する用紙搬送装置に関するものである。   The present invention relates to a sheet conveying apparatus, and more particularly, to a sheet conveying apparatus that conveys a sheet by sandwiching a sheet between a pair of rollers that rotate in a press-contact state.

複写機やプリンタ、ファクシミリなどの画像形成装置において、用紙を搬送する手段の一つとして、圧接した一対のローラを回転させてローラのニップで用紙を挟持し搬送させる手段がこれまでから広く用いられている。この搬送手段では、ローラ軸の平行度が重要な条件となる。すなわち、ローラ軸が平行でない場合には、ローラ間で用紙を挟持した時に、用紙に対して幅方向で大きさの異なる力が作用し用紙に歪みが生じる。この状態で用紙上にトナー画像が転写され、定着されると、例えば原画では直線であるものが複写画像では湾曲線となってしまい複写画像品質が著しく低下する。特に、用紙搬送用ローラ対の設置間隔が狭い装置においては、一つのローラ対に用紙後端がまだ挟持されている状態で、用紙前端が次のローラ対で挟持されるようになるので、用紙搬送途中で用紙の歪みを解消できなくなり前記問題が顕著に現れる。   In image forming apparatuses such as copiers, printers, and facsimiles, as one of the means for conveying paper, a means for rotating a pair of pressure-contacting rollers and holding and conveying the paper at the nip of the roller has been widely used. ing. In this conveying means, the parallelism of the roller shaft is an important condition. That is, when the roller shafts are not parallel, when the paper is sandwiched between the rollers, forces having different sizes in the width direction act on the paper, and the paper is distorted. When the toner image is transferred and fixed on the paper in this state, for example, a straight line in the original image becomes a curved line in the copy image, and the copy image quality is remarkably deteriorated. In particular, in an apparatus in which the installation interval of the pair of paper transport rollers is narrow, the front end of the paper is sandwiched by the next pair of rollers while the rear end of the paper is still sandwiched by one roller pair. The above-mentioned problem appears remarkably because the paper distortion cannot be eliminated during the conveyance.

そこで例えば特許文献１では、レジストローラに搬入される用紙のズレ量をセンサによって検出し、検出されたズレ量に基づいてレジストローラの平行度を調整する技術が提案されている。また特許文献２では、定着ローラに搬入される用紙の斜行量を測定し、測定された斜行量に基づいて搬送方向下流側の搬送ローラ軸をアクチュエータによって調整する技術が提案されている。さらに特許文献３では、感光体ドラムを支持する位置決めブロックの孔部に、転写ローラを支持する支持部材に設けられたガイドピンを係合させることにより、感光体ドラム軸心と転写ローラの軸心とを位置決めし、感光体ニップ幅と転写ニップ幅とのセンタ位置のズレを修正する技術が提案されている。
特開平１０−８７１１８号公報（第５頁−第７頁、図２） 特開２００２−２４４４９６号公報（第４頁−第５頁、図１、図３） 特開平１１−１９４６２９号公報（第７頁−第８頁、図６） Therefore, for example, Patent Document 1 proposes a technique for detecting a deviation amount of a sheet carried into a registration roller by a sensor and adjusting the parallelism of the registration rollers based on the detected deviation amount. Japanese Patent Application Laid-Open No. 2004-228561 proposes a technique for measuring the skew amount of the paper carried into the fixing roller and adjusting the transport roller shaft on the downstream side in the transport direction by an actuator based on the measured skew amount. Further, in Patent Document 3, a guide pin provided on a support member that supports a transfer roller is engaged with a hole of a positioning block that supports the photoconductor drum, whereby the axis of the photoconductor drum and the axis of the transfer roller are engaged. Has been proposed to correct the deviation of the center position between the photoconductor nip width and the transfer nip width.
JP-A-10-87118 (pages 5-7, FIG. 2) Japanese Unexamined Patent Publication No. 2002-244496 (pages 4 to 5, FIGS. 1 and 3) JP-A-11-194629 (pages 7-8, FIG. 6)

前記各特許文献の提案技術によれば用紙のズレやセンタ位置のズレを修正できるものの、その機構が複雑で装置が大型化すると共にコスト増加につながる。   According to the proposed techniques of the above-mentioned patent documents, the paper misalignment and the center misalignment can be corrected. However, the mechanism is complicated and the apparatus becomes larger and the cost increases.

本発明はこのような従来の問題に鑑みてなされたものであり、その目的とするところは、部材を追加することなく、簡単な機構でローラ軸の平行度を調整できる用紙搬送装置を提供することにある。   The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a paper transport device that can adjust the parallelism of a roller shaft with a simple mechanism without adding a member. There is.

前記目的を達成するため本発明の用紙搬送装置では、一対のローラと、このローラを軸支する軸受と、前記ローラの少なくとも一方のローラをもう一方のローラ側へ付勢する付勢手段と、正面視において下辺から上方に向かって切り欠き部が形成され、この切り欠き部に前記軸受を嵌挿することによって、前記付勢手段によって付勢されたローラを切り欠き部の内上面で押し付け保持すると同時に前記軸受の用紙搬送方向の位置決めを行うストッパとを設け、軸受の位置決めを行う前記切り欠き部の内側面間の中心線と、前記ストッパの外側面間の中心線とを用紙搬送方向に離隔し、前記ストッパの取り付ける向きを変えることにより、前記一対のローラの平行度を調整できるようにした。   In order to achieve the above object, in the paper conveying apparatus of the present invention, a pair of rollers, a bearing that supports the rollers, and a biasing unit that biases at least one of the rollers toward the other roller, A notch is formed from the lower side to the upper side when viewed from the front, and the roller urged by the urging means is pressed and held on the inner upper surface of the notch by inserting the bearing into the notch. At the same time, a stopper for positioning the bearing in the paper transport direction is provided, and a center line between the inner side surfaces of the notch for positioning the bearing and a center line between the outer side surfaces of the stopper are arranged in the paper transport direction. The parallelism of the pair of rollers can be adjusted by separating and changing the mounting direction of the stopper.

ローラの平行度調整の作業性を向上させる観点から、前記ストッパに係合爪を形成し、この係合爪を装置本体に係合させることによりストッパを装置本体に着脱可能に装着するようにするのが好ましい。   From the viewpoint of improving the workability of adjusting the parallelism of the rollers, an engaging claw is formed on the stopper, and the engaging claw is engaged with the apparatus main body so that the stopper is detachably attached to the apparatus main body. Is preferred.

本発明の用紙搬送装置では、ストッパにおける軸受の位置決めを行う切り欠き部の内側面間の中心線と、ストッパの外側面間の中心線とを用紙搬送方向に離隔したので、ストッパの取り付ける向きを変えることにより、一対のローラの平行度を調整することができる。また前記中心線間の離隔距離の異なるストッパを数種類作製しておけば、使用するストッパの組み合わせを変えることにより一層精密な平行度調整ができる。さらには、市販された装置のローラの平行度調整を個別に行う場合にも、特殊な工具を使用することなく迅速且つ容易に調整することができる。このため作業員の熟練性を必要としない。   In the paper transport device of the present invention, the center line between the inner side surfaces of the notch for positioning the bearing in the stopper and the center line between the outer side surfaces of the stopper are separated from each other in the paper transport direction. By changing, the parallelism of the pair of rollers can be adjusted. If several types of stoppers having different separation distances between the center lines are prepared, parallelism can be adjusted more precisely by changing the combination of the stoppers used. Furthermore, even when adjusting the parallelism of the rollers of a commercially available apparatus, the adjustment can be made quickly and easily without using a special tool. For this reason, the skill of an operator is not required.

またストッパに係合爪を形成し、係合爪を装置本体に係合させることによりストッパを装置本体に装着するようにすると、ストッパの着脱作業が容易となりローラの平行度調整の作業性が格段に向上する。   In addition, if an engaging claw is formed on the stopper and the engaging claw is engaged with the apparatus main body so that the stopper is attached to the apparatus main body, the stopper can be easily attached and detached, and the workability of adjusting the parallelism of the roller is remarkably improved. To improve.

以下、図に基づいて本発明の用紙搬送装置を説明する。なお、本発明はこれらの実施形態に何ら限定されるものではない。図１は、本発明の用紙搬送装置が搭載された画像形成装置の概略断面図である。感光体ドラム７０は帯電装置７１によってその表面が正又は負に一様に帯電される。他方、蓋９１によって覆われている原稿載置台９０に原稿（不図示）が載置され、その画像データが不図示の読み取り装置によって読みとられる。読み取られた画像データはレーザスキャナ（露光装置）７２によって感光体ドラム７０の表面に書き込まれ、感光体ドラム７０の表面に静電潜像が形成される。具体的には反転現像方式の場合には画像に相当する部分の帯電が除去され、正規現像方式の場合は背景に相当する部分の帯電が除去されて、それぞれ静電潜像が形成される。次に現像装置７３によって感光体ドラム７０上の静電潜像をトナーで可視像化する。このときトナーの帯電極性は、反転現像方式の場合には感光体ドラム７０の帯電極性と同極性であり、正規現像の場合は感光体ドラム７０の帯電極性と逆極性である。   Hereinafter, the sheet conveying apparatus of the present invention will be described with reference to the drawings. The present invention is not limited to these embodiments. FIG. 1 is a schematic cross-sectional view of an image forming apparatus equipped with a paper conveying device of the present invention. The surface of the photosensitive drum 70 is uniformly charged positively or negatively by a charging device 71. On the other hand, a document (not shown) is placed on a document placing table 90 covered with a lid 91, and the image data is read by a reading device (not shown). The read image data is written on the surface of the photosensitive drum 70 by a laser scanner (exposure device) 72, and an electrostatic latent image is formed on the surface of the photosensitive drum 70. Specifically, in the case of the reverse development method, the charge corresponding to the image is removed, and in the case of the regular development method, the charge corresponding to the background is removed to form an electrostatic latent image. Next, the electrostatic latent image on the photosensitive drum 70 is visualized with toner by the developing device 73. At this time, the charging polarity of the toner is the same as the charging polarity of the photosensitive drum 70 in the case of the reversal development method, and is opposite to the charging polarity of the photosensitive drum 70 in the case of regular development.

一方、給紙カセット８１に収納されている用紙Ｐは、ピックアップローラ８２により引き出され、給紙ローラ８３とさばきローラ８４とで挟持されて搬送路へ送られる。そしてレジストローラ対１によって、感光体ドラム７０上のトナー画像が転写部に到達するのにタイミングを合わせて、用紙Ｐは転写部へ送り出される。転写部では、感光体ドラム７０と転写ローラ７４との間で用紙Ｐが挟持されている状態で、トナー帯電極性と逆極性の電荷が転写ローラ７４に印加されることにより、感光体ドラム７０上のトナー像が用紙Ｐ上に移動する。用紙Ｐ上に移動せず感光体ドラム１上に残留したトナーはクリーニングローラ７５によって除去回収される。一方、トナー像を載置した用紙Ｐは定着ローラ対８５へ搬送される。ここでトナー像は定着ローラ対８５によって加熱・加圧されて用紙Ｐに定着する。そして排出ローラ対８６によって用紙Ｐは排紙部８７へ排出される。なお、手差しトレイ８８に載置された用紙Ｐは、給紙ローラ８９によってレジストローラ対１へ送りだされ、それ以後は前述の搬送経路と同じ経路を通る。   On the other hand, the paper P stored in the paper feed cassette 81 is pulled out by the pickup roller 82, sandwiched between the paper feed roller 83 and the separating roller 84, and sent to the conveyance path. Then, the registration roller pair 1 feeds the paper P to the transfer unit at the timing when the toner image on the photosensitive drum 70 reaches the transfer unit. In the transfer portion, the sheet P is sandwiched between the photosensitive drum 70 and the transfer roller 74, and a charge having a polarity opposite to the toner charging polarity is applied to the transfer roller 74. Toner image moves onto the paper P. The toner remaining on the photosensitive drum 1 without moving onto the paper P is removed and collected by the cleaning roller 75. On the other hand, the paper P on which the toner image is placed is conveyed to the fixing roller pair 85. Here, the toner image is heated and pressurized by the fixing roller pair 85 and fixed on the paper P. Then, the paper P is discharged to the paper discharge unit 87 by the discharge roller pair 86. The paper P placed on the manual feed tray 88 is sent to the registration roller pair 1 by the paper feed roller 89, and thereafter passes through the same path as the above-described transport path.

図１の画像形成装置において用紙搬送経路に設けられたローラ対の中で、用紙の搬送性及びタイミングに最も影響を与えるのがレジストローラ対１である。このレジストローラ対１のローラ軸の平行度が低いと画像品質が低下する。特に、図１の画像形成装置のように搬送経路が短い場合には、レジストローラ対１による影響が搬送途中で修正できず、レジストローラ対１の平行度が画像品質に直結する。したがって本発明の用紙搬送装置をレジストローラ対として用いると最も効果的である。もちろん他のローラ対に本発明の用紙搬送装置を用いても構わない。   In the image forming apparatus of FIG. 1, among the roller pairs provided in the paper conveyance path, the registration roller pair 1 has the most influence on the paper conveyance performance and timing. If the parallelism of the roller shafts of the registration roller pair 1 is low, the image quality deteriorates. In particular, when the conveyance path is short as in the image forming apparatus of FIG. 1, the influence of the registration roller pair 1 cannot be corrected during the conveyance, and the parallelism of the registration roller pair 1 is directly linked to the image quality. Therefore, it is most effective to use the sheet conveying device of the present invention as a pair of registration rollers. Of course, the paper conveying device of the present invention may be used for other roller pairs.

図２に、図１における搬送ユニット５の斜視図を示す。このユニット５には、レジストローラ対１の一方のレジストローラ１ａと、転写ローラ７４とが取り付けられている。レジストローラ対１のもう一方のレジストローラ１ｂ及び感光体ドラム７０は画像形成装置本体側に取り付けられており、ユニット５を画像形成装置本体に装着すると、後述するバネ（付勢手段、図３に図示）４によってレジストローラ１ａはもう一つのレジストローラ１ｂと圧接し、転写ローラ７４は感光体７０に圧接するようになる。後述するように、レジストローラ１ａは、ストッパ３によって図の上方へ抜け外れるのを防止されていると同時に搬送方向の位置決めがなされている。   FIG. 2 is a perspective view of the transport unit 5 in FIG. In this unit 5, one registration roller 1 a of the registration roller pair 1 and a transfer roller 74 are attached. The other registration roller 1b of the registration roller pair 1 and the photosensitive drum 70 are attached to the image forming apparatus main body. When the unit 5 is attached to the image forming apparatus main body, a spring (biasing means, which will be described later with reference to FIG. 3). 4), the registration roller 1a comes into pressure contact with the other registration roller 1b, and the transfer roller 74 comes into pressure contact with the photoreceptor 70. As will be described later, the registration roller 1a is prevented from slipping upward in the figure by the stopper 3, and at the same time positioned in the transport direction.

図３に組立斜視図、図４に組立後の正面図を示す。レジストローラ１ａの軸部１１を軸受２の孔２１に嵌入し、ストッパ３の切り欠き部３１に軸受２を填め入れる。そして軸受２が装着されたストッパ３をユニット本体５０に形成された台座５１の上方に位置させ、軸受２の下面と台座５１との間にバネ４を介装させた状態でストッパ３を下方に押し下げ、ストッパ３の下端部に形成された係合爪３２ａ，３２ｂをユニット本体５０の突起５２に係合させる。このようにしてレジストローラ１ａをユニット本体５０に取り付ける。   FIG. 3 shows an assembled perspective view, and FIG. 4 shows a front view after assembly. The shaft portion 11 of the registration roller 1 a is fitted into the hole 21 of the bearing 2, and the bearing 2 is fitted into the notch portion 31 of the stopper 3. Then, the stopper 3 to which the bearing 2 is mounted is positioned above a pedestal 51 formed on the unit body 50, and the stopper 3 is moved downward with the spring 4 interposed between the lower surface of the bearing 2 and the pedestal 51. The engaging claws 32 a and 32 b formed at the lower end of the stopper 3 are engaged with the protrusions 52 of the unit main body 50 by pushing down. In this way, the registration roller 1a is attached to the unit main body 50.

上記構成によれば、軸受２はレジストローラ１ａを回転可能に支持すると共に、バネ４によってもう一方のレジストローラ１ｂ側に押し上げ付勢され、ストッパ３の切り欠き部３１の内上面に押し付け保持される。またストッパ３の切り欠き部３１の内側面で、軸受２の用紙搬送方向の位置決め、すなわちレジストローラ１ａの位置決めがなされる。ユニット５を画像形成装置本体に取り付けると、レジストローラ１ａがもう一つのレジストローラ１ｂに圧接し、レジストローラ１ｂの圧力によってレジストローラ１ａは台座５１
方向に押し下げられ、軸受２はストッパ３の切り欠き部３１の内上面と非接触状態となる。したがってストッパ３は、レジストローラ対１が非圧接状態のときにレジストローラ１ａがユニット本体５０から外れるのを防止する役割と、切り欠き部３１の内側面によってレジストローラ１ａの用紙搬送方向の位置決めを行う役割とを果たす。 According to the above configuration, the bearing 2 rotatably supports the registration roller 1 a and is pushed up and biased toward the other registration roller 1 b by the spring 4 and is pressed and held on the inner upper surface of the notch portion 31 of the stopper 3. The Further, the bearing 2 is positioned in the sheet conveyance direction, that is, the registration roller 1a is positioned on the inner surface of the notch 31 of the stopper 3. When the unit 5 is attached to the main body of the image forming apparatus, the registration roller 1a comes into pressure contact with the other registration roller 1b.
The bearing 2 is brought into a non-contact state with the inner upper surface of the notch 31 of the stopper 3. Therefore, the stopper 3 serves to prevent the registration roller 1a from being detached from the unit main body 50 when the registration roller pair 1 is in a non-pressure contact state, and positions the registration roller 1a in the paper conveyance direction by the inner surface of the notch 31. Play a role to do.

ストッパ３の切り欠き部３１による、レジストローラ１ａの用紙搬送方向の位置決めについて次に説明する。図５に、本発明で使用するストッパの一例を示す正面図を示す。図５のストッパ３は逆Ｕ字形状をなし、下辺から上方に向かって形成された切り欠き部３１は大幅部３１ａと小幅部３１ｂとからなる。軸受２は切り欠き部３１の小幅部３１ｂに嵌入される。またストッパ３の下端部には外方に向かって係合爪３２ａ，３２ｂが形成されている。ここで重要なことは、切り欠き部３１の小幅部３１ｂの内側面間幅ｄの中心線Ｌ2と、ストッパ３の外側面間幅Ｄの中心線Ｌ1とを距離ｎだけ離隔させたことにある。これによって、ユニット本体５０にストッパ３を取り付ける際にストッパ３の向きを変えることにより、軸受２、つまりレジストローラ１ａを用紙搬送方向に移動させることができ、レジストローラ対１の平行度を調整できるようになる。なお、実使用に際して、ストッパ３の向きをわかりやすくするためにストッパ３に視認印３３を設けることが推奨される。 Next, the positioning of the registration roller 1a in the sheet conveyance direction by the notch 31 of the stopper 3 will be described. FIG. 5 is a front view showing an example of a stopper used in the present invention. The stopper 3 in FIG. 5 has an inverted U shape, and the cutout portion 31 formed upward from the lower side includes a large portion 31a and a small width portion 31b. The bearing 2 is fitted into the small width portion 31 b of the notch portion 31. Further, engaging claws 32a and 32b are formed on the lower end portion of the stopper 3 outward. What is important here is that the center line L 2 of the width d between the inner surfaces of the small width portion 31 b of the notch 31 is separated from the center line L 1 of the width D between the outer surfaces of the stopper 3 by a distance n. It is in. Accordingly, by changing the direction of the stopper 3 when the stopper 3 is attached to the unit main body 50, the bearing 2, that is, the registration roller 1a can be moved in the sheet conveyance direction, and the parallelism of the registration roller pair 1 can be adjusted. It becomes like this. In actual use, it is recommended to provide a visual mark 33 on the stopper 3 in order to make the direction of the stopper 3 easy to understand.

図６に示すように、上側のレジストローラ１ｂ（図中、破線）と下側のレジストローラ１ａ（図中、実線）とのローラ軸が平行でない場合であって（同図（ａ））、下側のレジストローラ１ａの右側のストッパとして図５に示したものを使用しているときには、このストッパを半回転させて装着すると、レジストローラ１ａの軸が紙面上方に距離２ｎ移動し、ローラ軸の平行度は修正される（同図（ｂ））。   As shown in FIG. 6, when the roller shafts of the upper registration roller 1b (broken line in the figure) and the lower registration roller 1a (solid line in the figure) are not parallel (the figure (a)), When the stopper shown in FIG. 5 is used as the stopper on the right side of the lower registration roller 1a, if the stopper is rotated by half rotation, the axis of the registration roller 1a moves by a distance 2n above the paper surface, and the roller shaft The degree of parallelism is corrected ((b) in the figure).

例えば、中心線Ｌ1と中心線Ｌ2との離隔距離ｎを０．５（ｍｍ）と０．８（ｍｍ）とした２種類のストッパＡ，ストッパＢを作製した場合には、取り付けるストッパの種類、向き、そしてローラの左右位置を選択することにより、図７に示すように８種類の組み合わせが可能となり、ローラ軸のより精密な平行度調整ができるようになる。なお、図７における傾きとは、ローラ軸が水平な状態から前記２種類のストッパを用いたときに、ローラ軸の左端を固定したとして右端が移動する距離を示したものである（下方がプラス、上方がマイナス）。 For example, when two types of stoppers A and B having a separation distance n between the center line L 1 and the center line L 2 of 0.5 (mm) and 0.8 (mm) are produced, By selecting the type, orientation, and left and right positions of the roller, eight types of combinations are possible as shown in FIG. 7, and the parallelism of the roller shaft can be adjusted more precisely. Note that the inclination in FIG. 7 indicates the distance that the right end moves when the two types of stoppers are used from a state in which the roller shaft is horizontal (the lower end is a plus). , The upper part is minus).

本発明で使用するストッパはプラスチック材料など従来公知の材料で作製することができ、作製費などを考慮すればプラスチック材料を金型成形して作製するのが望ましい。   The stopper used in the present invention can be made of a conventionally known material such as a plastic material, and it is desirable to mold the plastic material by molding in consideration of the production cost.

以上説明したレジストローラ対では、一方のローラを固定し、もう一方のローラの軸を移動させているが、両ローラの軸を移動可能としても構わない。むしろ両ローラの軸を移動可能とした方が一層精度よくローラ軸の平行度を調整することができる。   In the registration roller pair described above, one roller is fixed and the shaft of the other roller is moved, but the shafts of both rollers may be movable. Rather, the parallelism of the roller shafts can be adjusted with higher accuracy if the shafts of both rollers are movable.

本発明の用紙搬送装置を用いた画像形成装置の一例を示した概略説明図である。1 is a schematic explanatory view showing an example of an image forming apparatus using a paper conveying device of the present invention. レジストローラ及び転写ローラが装着されたユニットの斜視図である。It is a perspective view of a unit in which a registration roller and a transfer roller are mounted. レジストローラの組立斜視図である。It is an assembly perspective view of a registration roller. レジストローラをユニット本体に装着した状態の正面図である。FIG. 3 is a front view of a state in which a registration roller is mounted on a unit body. 本発明で使用するストッパの一例を示す正面図である。It is a front view which shows an example of the stopper used by this invention. ローラの平行度調整を説明する図である。It is a figure explaining the parallelism adjustment of a roller. ２種類のストッパを用いたときのローラの平行度調整を説明する図である。It is a figure explaining the parallelism adjustment of a roller when two types of stoppers are used.

符号の説明Explanation of symbols

１ レジストローラ対
１ａ，１ｂ レジストローラ
２ 軸受
３ ストッパ
４ バネ（付勢手段）
５ ユニット
１１ 軸部
２１ 孔
３１ 切り欠き部
３１ａ 大幅部
３１ｂ 小幅部
３２ａ，３２ｂ 係合爪
３３ 視認印
５０ ユニット本体
５１ 突部
５２ 台座 1 registration roller pair 1a, 1b registration roller 2 bearing 3 stopper 4 spring (biasing means)
5 Unit 11 Shaft portion 21 Hole 31 Notch portion 31a Large portion 31b Small width portion 32a, 32b Engaging claw 33 Visual mark 50 Unit body 51 Protruding portion 52 Base

Claims (2)

一対のローラと、このローラを軸支する軸受と、前記ローラの少なくとも一方のローラをもう一方のローラ側へ付勢する付勢手段と、正面視において下辺から上方に向かって切り欠き部が形成され、この切り欠き部に前記軸受を嵌挿することによって、前記付勢手段によって付勢されたローラを切り欠き部の内上面で押し付け保持すると同時に前記軸受の用紙搬送方向の位置決めを行うストッパとを備え、圧接状態で回転する前記一対のローラ間で用紙を挟持して搬送する装置において、
軸受の位置決めを行う前記切り欠き部の内側面間の中心線と、前記ストッパの外側面間の中心線とを用紙搬送方向に離隔し、前記ストッパの取り付ける向きを変えることにより、前記一対のローラの平行度を調整できるようにしたことを特徴とする用紙搬送装置。 A pair of rollers, a bearing that pivotally supports the rollers, a biasing means that biases at least one of the rollers toward the other roller, and a notch formed upward from the lower side in a front view. And a stopper that presses and holds the roller urged by the urging means on the inner upper surface of the notch and at the same time positioning the bearing in the paper transport direction by fitting the bearing into the notch. An apparatus for sandwiching and conveying a sheet between the pair of rollers rotating in a pressure contact state,
By separating the center line between the inner side surfaces of the notch for positioning the bearing and the center line between the outer side surfaces of the stopper in the paper transport direction, and changing the mounting direction of the stopper, the pair of rollers A paper conveying device characterized in that the parallelism of the paper can be adjusted. 前記ストッパに形成した係合爪を装置本体に係合することにより前記ストッパを装置本体に着脱可能に装着する請求項１記載の用紙搬送装置。   The paper conveying apparatus according to claim 1, wherein the stopper is detachably mounted on the apparatus main body by engaging an engaging claw formed on the stopper with the apparatus main body.
JP2003295877A 2003-08-20 2003-08-20 Paper transport device Expired - Fee Related JP4073377B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013227146A (en) * 2012-04-26 2013-11-07 Canon Inc Sheet conveying apparatus and image forming apparatus
US8746697B2 (en) 2012-07-31 2014-06-10 Kyocera Document Solutions Inc. Sheet transport mechanism and image forming apparatus having the same
EP2921913A1 (en) * 2014-03-20 2015-09-23 Kyocera Document Solutions Inc. Roller support mechanism, roller unit, and fixing device
JP2019049764A (en) * 2019-01-08 2019-03-28 ブラザー工業株式会社 Image forming apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013227146A (en) * 2012-04-26 2013-11-07 Canon Inc Sheet conveying apparatus and image forming apparatus
US8746697B2 (en) 2012-07-31 2014-06-10 Kyocera Document Solutions Inc. Sheet transport mechanism and image forming apparatus having the same
EP2921913A1 (en) * 2014-03-20 2015-09-23 Kyocera Document Solutions Inc. Roller support mechanism, roller unit, and fixing device
CN104932233A (en) * 2014-03-20 2015-09-23 京瓷办公信息***株式会社 Roller support mechanism, roller unit, and fixing device
US9261837B2 (en) 2014-03-20 2016-02-16 Kyocera Document Solutions Inc. Roller support mechanism, roller unit, and fixing device
JP2019049764A (en) * 2019-01-08 2019-03-28 ブラザー工業株式会社 Image forming apparatus

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