JP4160895B2 - Document reading apparatus and image forming apparatus using the same - Google Patents

Document reading apparatus and image forming apparatus using the same Download PDF

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JP4160895B2
JP4160895B2 JP2003422228A JP2003422228A JP4160895B2 JP 4160895 B2 JP4160895 B2 JP 4160895B2 JP 2003422228 A JP2003422228 A JP 2003422228A JP 2003422228 A JP2003422228 A JP 2003422228A JP 4160895 B2 JP4160895 B2 JP 4160895B2
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document
document reading
guide member
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sheet
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JP2005178989A (en
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正利 榊谷
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Ricoh Co Ltd
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Description

本発明は、複写機、スキャナ、ファクシミリ等に用いられるシートスルー方式の原稿読み取り装置及びこれを用いた画像形成装置に関する。   The present invention relates to a sheet-through type document reading apparatus used for a copying machine, a scanner, a facsimile, and the like, and an image forming apparatus using the same.

シートスルー読み取り機能を有する原稿読み取り装置やこれを用いた画像形成装置においては、コンタクトガラス上に原稿を搭載して照明用光源により光を照射し、画像読み取り手段（キャリッジ等と称する）を停止させた状態のまま原稿を搬送して読み取る方式と、キャリッジを移動走査して読み取る読み取り方式があるが、どちらの読み取り方式においても読み取り部位におけるゴミ等の存在が問題になる。   In an original reading apparatus having a sheet-through reading function and an image forming apparatus using the same, an original is mounted on a contact glass, light is irradiated by an illumination light source, and image reading means (referred to as a carriage or the like) is stopped. There are a method of conveying and reading a document while it is in a state of being read, and a reading method of reading a document by moving and scanning the carriage. In both reading methods, the presence of dust or the like at the reading portion becomes a problem.

シートスルー読み取りを行う場合、コンタクトガラス上に例えば修正液やボールペンの余剰インクが点状のゴミとして存在すると、読み取り部のキャリッジを固定している場合には、これら付着したゴミが副走査方向に伸びた黒スジ画像として出力される。このようなゴミの画像を含む読み取り画像は、もちろん原稿画像上には無いデータであり、当然にクレームの原因となる。   When performing sheet-through reading, for example, if correction liquid or excess ink from a ballpoint pen is present as dot-like dust on the contact glass, if the carriage of the reading unit is fixed, these attached dust will move in the sub-scanning direction. Output as an extended black streak image. The read image including such a dust image is, of course, data that does not exist on the document image, and naturally causes a complaint.

この問題を解消するための手段として、読み取り部のコンタクトガラスの表面にゴミ等が付着するのを防ぐための処理を施したり、読み取り部の位置をゴミの付着の少ないところにしたりする等の方法が提案されているが、既存の方法では読み取り部にゴミが付着してしまった場合に生じる不具合を解消することはできない。そのためシートスルー方式の原稿読み取り装置においては、上述のような黒スジ画像が慢性的なクレーム原因となっており、簡易な方法で上記クレームを低減できる構造の開発が望まれていた。   As a means for solving this problem, a method for preventing dust from adhering to the surface of the contact glass of the reading unit, or a method of reducing the position of the reading unit to a point where dust does not adhere However, the existing method cannot solve the problem that occurs when dust adheres to the reading unit. Therefore, in the sheet-through type document reading apparatus, the black streak image as described above is a cause of chronic complaints, and it has been desired to develop a structure that can reduce the aforementioned complaints by a simple method.

また従来、シートスルー読み取り機能を有する原稿読み取り装置やこれを用いた画像形成装置においては、厚手で剛性の高い原稿を通紙したときに搬送部の隙間が狭いため、そこで原稿がとまってしまう可能性があり、これも解決が望まれていた。   Conventionally, in an original reading apparatus having a sheet-through reading function and an image forming apparatus using the same, since the gap of the conveyance unit is narrow when a thick and highly rigid original is passed, the original may be stopped there. There was a possibility, and this was also desired to be solved.

さらに、搬送する読み取り対象の原稿の先端、後端を検知するセンサは、該センサを構成する部品性能と原稿搬送速度にもよるが、原稿が通常２mm程度の隙間の中で上下どこを通るかによって原稿の検出タイミングに差が生じ、その結果、原稿先端、後端の位置を正確に検出できないことがあるという問題もあった。   Furthermore, the sensor that detects the leading and trailing edges of the document to be read that is transported depends on the performance of the parts that make up the sensor and the document transport speed, but where the document normally passes in a gap of about 2 mm. Therefore, there is a problem in that the detection timing of the document is different, and as a result, the positions of the leading edge and the trailing edge of the document may not be detected accurately.

本発明は、上述した従来の問題点にかんがみ、原稿読み取り開始前に原稿に付着してともに搬送されてきたゴミ等を除去可能とした原稿読み取り装置及びこれを用いた画像形成装置を提供することを目的とする。   SUMMARY OF THE INVENTION In view of the above-described conventional problems, the present invention provides an original reading apparatus capable of removing dust or the like that has adhered to and conveyed together with the original before starting the original reading, and an image forming apparatus using the same. With the goal.

本発明の請求項１に係る原稿読み取り装置は、シート状の原稿を搬送しつつ原稿面を読み取るシートスルー方式の原稿読み取り装置において、原稿読み取り部の原稿搬送方向上流側のガイド板が、搬送する原稿の原稿面に付着した修正液やボールペンの余剰インク等を掻き落とす掻き落とし形状部を有し、前記掻き落とし形状部に対して出没する方向に可動のガイド部材を設けてなることを特徴とする。
The document reading device according to claim 1 of the present invention is a sheet-through type document reading device that reads a document surface while conveying a sheet-like document, and a guide plate on the upstream side of the document reading direction of the document reading unit conveys the document. have a correction fluid or scraper shape portion scrape excess ink or the like of the ballpoint pen attached to the document surface of the document, characterized Rukoto such provided movable guide member in a direction infested with respect to the scraper-shaped portion And

請求項２に係るものは、シート状の原稿を搬送しつつ原稿面を読み取るシートスルー方式の原稿読み取り装置において、原稿読み取り部の原稿搬送方向上流側のガイド板が、搬送する原稿の原稿面に付着した修正液やボールペンの余剰インク等を掻き落とす掻き落とし形状部を有し、前記掻き落とし形状部が、搬送する原稿の原稿面側に突出する凸形状を有し、前記掻き落とし形状部に対して出没する方向に可動のガイド部材を設けてなることを特徴とする。
According to a second aspect of the present invention, in a sheet-through type document reading apparatus that reads a document surface while conveying a sheet-like document, a guide plate on the upstream side in the document conveyance direction of the document reading unit is placed on the document surface of the document to be conveyed. has a scraping shaped portion scrape excess ink or the like adhering correction fluid or ball-point pen, the scraper-shaped section, have a convex shape protruding on the original surface of the original to be conveyed, the scraper-shaped portion characterized Rukoto such provided movable guide member in a direction infested against.

請求項３に係るものは、シート状の原稿を搬送しつつ原稿面を読み取るシートスルー方式の原稿読み取り装置において、原稿読み取り部の原稿搬送方向上流側のガイド板が、搬送する原稿の原稿面に付着した修正液やボールペンの余剰インク等を掻き落とす掻き落とし形状部を有し、前記掻き落とし形状部が、原稿搬送方向上流から下流側へ向かうにつれて前記原稿の原稿面側へ突出する傾斜面を有し、前記掻き落とし形状部に対して出没する方向に可動のガイド部材を設けてなることを特徴とする。
According to a third aspect of the present invention, in a sheet-through type document reading apparatus that reads a document surface while conveying a sheet-like document, a guide plate on the upstream side in the document conveyance direction of the document reading unit is placed on the document surface of the document to be conveyed. It has a scraping shape portion that scrapes off the adhering correction liquid and excess ink of the ballpoint pen, and the scraping shape portion has an inclined surface that protrudes toward the document surface side of the document from the upstream side to the downstream side in the document transport direction Yes, and it characterized Rukoto such provided movable guide member in a direction infested with respect to the scraper-shaped portion.

請求項４に係るものは、請求項１ないし３のいずれかの原稿読み取り装置において、前記ガイド部材が、原稿搬送方向上流側から下流側へ向かうにつれて前記原稿の原稿面側へ突出する傾斜面を有することを特徴とする。
According to a fourth aspect of the present invention, in the document reading device according to any one of the first to third aspects, the guide member has an inclined surface that protrudes toward the document surface side of the document as it goes from the upstream side to the downstream side in the document transport direction. and wherein the Rukoto that Yusuke.

請求項５に係るものは、請求項４の原稿読み取り装置において、前記掻き落とし形状部と前記ガイド部材の傾斜面が原稿搬送方向上流側に向かって広く、原稿搬送方向下流側に向かって狭まる搬送路形状を形成することを特徴とする。
Pertaining to claim 5 is the document reading apparatus according to claim 4, the inclined surface of the guide member and the scraping-shaped portion is wider toward the originals conveyance direction upstream side, Tsu suited the document conveying direction downstream side It is characterized by forming a narrowed conveyance path shape .

請求項６に係るものは、請求項５の原稿読み取り装置において、前記掻き落とし形状部の頂部と前記ガイド部材の傾斜面の途中部位に対向することを特徴とする。
According to a sixth aspect of the present invention, in the original reading device according to the fifth aspect , the top of the scraped-off shape portion and the middle portion of the inclined surface of the guide member are opposed to each other.

請求項７に係るものは、請求項１ないし３のいずれかの原稿読み取り装置において、前記掻き落とし形状部と前記ガイド部材を、搬送する原稿の先端、後端を検知するセンサ部の原稿搬送方向上流側に配置してなることを特徴とする。
According to a seventh aspect of the present invention, in the original reading device according to any one of the first to third aspects, the original conveying direction of the sensor unit that detects the leading edge and the trailing edge of the original that conveys the scraped shape portion and the guide member. the Rukoto such arranged upstream characterized.

請求項８に係る画像形成装置は、請求項１ないし７のいずれかの画像読み取り装置を有することを特徴とする。 An image forming apparatus according to an eighth aspect includes the image reading apparatus according to any one of the first to seventh aspects.

本発明は、シートスルー方式の原稿読み取り時に、原稿面に付着した修正液やボールペンの余剰インク等を掻き落とし、読み取り部がそれらにより汚れず、読み取り部の汚れに起因する黒スジの発生とそれに対するクレームを、簡易な構造で低減させ得る。   In the present invention, when reading a sheet-through type document, the correction liquid adhering to the document surface or excess ink of the ballpoint pen is scraped off, and the reading unit is not contaminated by them. Can be reduced with a simple structure.

また厚手で剛性のある原稿の通紙性も向上させ得る。   Further, the paper passing property of a thick and rigid document can be improved.

さらに、原稿の先端、後端の検出精度を高め得る。   Furthermore, the detection accuracy of the leading edge and trailing edge of the document can be improved.

以下本発明を実施するための最良の形態を、図に示す実施例を参照して説明する。   The best mode for carrying out the present invention will be described below with reference to the embodiments shown in the drawings.

図１は、本発明の実施対象として、シートスルー読み取り機能を有する原稿読み取り装置の一例としての自動原稿搬送装置（ＡＤＦ）とこれを搭載した画像形成装置を示す概略断面図である。なお、図示の自動原稿搬送装置は単なる一例であって、後述するシートスルー読み取り機能を有する原稿読み取り装置であればどのようなものでも本発明を適用できる。   FIG. 1 is a schematic cross-sectional view showing an automatic document feeder (ADF) as an example of a document reading apparatus having a sheet-through reading function and an image forming apparatus equipped with the automatic document conveying apparatus (ADF). Note that the illustrated automatic document feeder is merely an example, and the present invention can be applied to any document reading device having a sheet-through reading function described later.

図示の画像形成装置は主に、原稿を読み取る読み取りユニット１１、画像を形成する画像形成部１２、自動原稿搬送装置（ＡＤＦ）１３、ＡＤＦ１３から送り出される原稿をスタックする原稿排紙トレイ１４、給紙カセット１５ないし１８を備える給紙部１９、記録用紙をスタックする排紙部（排紙トレイ２０）により構成してある。   The illustrated image forming apparatus mainly includes a reading unit 11 that reads a document, an image forming unit 12 that forms an image, an automatic document feeder (ADF) 13, a document discharge tray 14 that stacks documents sent from the ADF 13, and a paper feed The paper feeding unit 19 includes cassettes 15 to 18 and a paper discharge unit (discharge tray 20) for stacking recording paper.

そして、ＡＤＦ１３の原稿台２１上に原稿Ｄをセットして図示せぬ操作部での操作、例えばプリントキーの押下操作をすると、最上位の原稿Ｄがピックアップローラ２２の回転により矢印Ｂ１方向へ送り出され、原稿搬送ベルト２３の回転により、画像読み取りユニット１１に固定されたコンタクトガラス２４上へ給送され、そこで停止する。コンタクトガラス２４上に載置された原稿Ｄの画像は、画像形成部１２とコンタクトガラス２４の間に位置する読み取り装置２５によって読み取る。読み取り装置２５は、コンタクトガラス２４上の原稿Ｄを照明する光源２６、原稿画像を結像する光学系２７、原稿画像を結像させるＣＣＤ等からなる光電変換素子２８等を有している。画像読み取り終了後、原稿Ｄを搬送ベルト２３の回転により矢印Ｂ２方向へ搬送して排紙トレイ１４上へ排出する。このように、原稿Ｄを１枚ずつコンタクトガラス１４上へ給送して原稿画像を画像読み取りユニット１によって読み取る。   Then, when the document D is set on the document table 21 of the ADF 13 and an operation on an operation unit (not shown), for example, a press operation of a print key is performed, the uppermost document D is sent out in the direction of the arrow B1 by the rotation of the pickup roller 22. Then, by the rotation of the document conveying belt 23, the paper is fed onto the contact glass 24 fixed to the image reading unit 11, and stops there. The image of the document D placed on the contact glass 24 is read by a reading device 25 located between the image forming unit 12 and the contact glass 24. The reading device 25 includes a light source 26 that illuminates the document D on the contact glass 24, an optical system 27 that forms an image of the document, a photoelectric conversion element 28 that includes a CCD that forms an image of the document, and the like. After the image reading is completed, the document D is transported in the direction of arrow B2 by the rotation of the transport belt 23 and discharged onto the paper discharge tray 14. In this way, the document D is fed one by one onto the contact glass 14 and the document image is read by the image reading unit 1.

一方、画像形成部１２の内部には、像担持体である感光体３０が配置してある。感光体３０は、図において時計方向に回転駆動し、帯電装置３１によって表面を所定の電位に帯電させる。また、書き込みユニット３２からは、読み取り装置２５によって読み取った画像情報に応じて光変調したレーザ光Ｌを照射し、帯電させた感光体３０の表面をこのレーザ光Ｌで露光し、これによって感光体３０の表面に静電潜像を形成する。この静電潜像は、現像装置３３を通るとき、対向する転写装置３４によって感光体３０と転写装置３４の間に給送された記録媒体Ｐに転写する。トナー像転写後の感光体３０の表面は、クリーニング装置３５によって清掃する。   On the other hand, inside the image forming unit 12, a photoconductor 30 as an image carrier is disposed. The photosensitive member 30 is driven to rotate clockwise in the drawing, and the surface is charged to a predetermined potential by the charging device 31. Further, the writing unit 32 emits a laser beam L that is light-modulated in accordance with image information read by the reading device 25, and the surface of the charged photoreceptor 30 is exposed with the laser beam L, whereby the photoreceptor is exposed. An electrostatic latent image is formed on the surface 30. When the electrostatic latent image passes through the developing device 33, the electrostatic latent image is transferred to the recording medium P fed between the photosensitive member 30 and the transfer device 34 by the opposing transfer device 34. The surface of the photoconductor 30 after the toner image is transferred is cleaned by a cleaning device 35.

画像形成部２の下部に配置した複数の給紙カセット１５ないし１８には、紙等の記録媒体Ｐを収容してあり、いずれかの給紙カセット１５ないし１８から記録媒体Ｐを矢印Ｂ３方向へ送り出し、その記録媒体Ｐの表面に、上述のように感光体３０の表面に形成したトナー像を転写する。次に、記録媒体Ｐを矢印Ｂ４で示すように画像形成部２内の定着装置３６を通し、熱と圧力の作用によって記録媒体Ｐの表面に転写されたトナー像を定着させる。定着装置３６を通った記録媒体Ｐを排出ローラ対３７によって搬送し、矢印Ｂ５で示すように排紙トレイ２０へ排出し、スタックする。   A plurality of paper feed cassettes 15 to 18 arranged in the lower part of the image forming unit 2 contain recording media P such as paper, and the recording media P is fed from any of the paper feed cassettes 15 to 18 in the direction of arrow B3. The toner image formed on the surface of the photoreceptor 30 as described above is transferred onto the surface of the recording medium P. Next, the recording medium P is passed through the fixing device 36 in the image forming unit 2 as indicated by an arrow B4, and the toner image transferred onto the surface of the recording medium P by the action of heat and pressure is fixed. The recording medium P that has passed through the fixing device 36 is conveyed by the discharge roller pair 37, discharged to the discharge tray 20 as indicated by an arrow B5, and stacked.

図２は、本発明の一実施例における原稿読み取り部の拡大断面概略図である。図中５１は原稿読み取り部で、図１の装置では光学系２７のコンタクトガラス２４に対する光軸Ｘ上に位置する部位である。また図中５２は原稿搬送用のローラ、５３はそれに対向する加圧ローラ、５４は原稿搬送方向で下流側に位置する原稿搬送用のローラ、５５はそれに対向する加圧ローラ、５６は白圧板、５７は角パイプ材、５８はスプリング、５９はガイド板、６０は凸形状部である。   FIG. 2 is an enlarged schematic cross-sectional view of a document reading unit in an embodiment of the present invention. In the figure, reference numeral 51 denotes an original reading unit, which is a part located on the optical axis X with respect to the contact glass 24 of the optical system 27 in the apparatus of FIG. In the figure, 52 is a document conveying roller, 53 is a pressure roller facing it, 54 is a document conveying roller located downstream in the document conveying direction, 55 is a pressure roller facing it, and 56 is a white pressure plate. , 57 are square pipe members, 58 is a spring, 59 is a guide plate, and 60 is a convex portion.

凸形状部６０は、原稿読み取り部５１よりも原稿搬送方向上流側でガイド板５９に形成してあり、図示しない搬送原稿の原稿面に付着した修正液やボールペンの余剰インク等を掻き落とす掻き落とし形状部となる。凸形状部６０は、上方に位置することになる搬送原稿の原稿面（図の例では下面）に向かって突出する形状を有し、かつ原稿搬送方向上流側から下流側へ向かうにつれて上方へ突出してゆく傾斜面Ｓをなす。   The convex portion 60 is formed on the guide plate 59 upstream of the document reading unit 51 in the document transport direction, and scrapes off the correction liquid adhering to the document surface of the transported document (not shown) or excess ink of the ballpoint pen. It becomes a shape part. The convex portion 60 has a shape that protrudes toward the document surface (lower surface in the example in the figure) of the transported document that is positioned above, and protrudes upward from the upstream side to the downstream side in the document transport direction. An inclined surface S is formed.

したがって、ローラ５２、５３を介して搬送された原稿は、その先端が傾斜面Ｓを比較的スムーズに登っていき、凸形状部６０の頂部を乗り越えて原稿読み取り部５１に至る。すなわち傾斜面Ｓは搬送に対して抵抗にはほとんどならないが、原稿面に付着した修正液やボールペンの余剰インク等は、傾斜面Ｓとの摺接や、凸形状部６０の頂部で引っかかれることにより、原稿読み取り部５１へ至る前に除去され得る。   Accordingly, the document conveyed via the rollers 52 and 53 has its leading end climbing the inclined surface S relatively smoothly, and passes over the top of the convex portion 60 to reach the document reading unit 51. In other words, the inclined surface S hardly resists conveyance, but the correction liquid adhering to the document surface, the excess ink of the ballpoint pen, etc., is slid on the inclined surface S or pulled on the top of the convex portion 60. Thus, it can be removed before reaching the document reading unit 51.

原稿読み取り部５１に至った原稿は、その先端側からスプリング５８の付勢力によってコンタクトガラス２４側へ押し付け付勢されている白圧板５６で上方から押さえられつつ移動し（通紙方向を図中に矢印で示す）、原稿面の内容を読み取られ、ローラ５４、５５を介して原稿読み取り部５１から脱する。   The document that has reached the document reading unit 51 moves while being pressed from above by a white pressure plate 56 that is pressed and urged toward the contact glass 24 by the urging force of the spring 58 from the leading end side (the sheet passing direction in the figure). The content of the original surface is read, and is removed from the original reading unit 51 via the rollers 54 and 55.

図３は、本発明の他の実施例における原稿読み取り部の拡大断面概略図である。ほとんどの構成は図２の例と同様であるが、上側のガイド板５９にガイド部材６１をスプリング６２で下方へ突出付勢して可動に設けてある。このガイド部材６１は、凸形状部６０に対して出没する方向に可動であり、また凸形状部６０と同様に、原稿搬送方向上流側から下流側へ向かうにつれて下方へ突出してゆく傾斜面Ｓ’をなす。凸形状部６０の頂部は傾斜面Ｓ’の途中部位に対向している。   FIG. 3 is an enlarged schematic cross-sectional view of a document reading unit according to another embodiment of the present invention. Most of the configurations are the same as in the example of FIG. 2, but a guide member 61 is provided on the upper guide plate 59 so as to be movable downwardly by a spring 62. The guide member 61 is movable in the direction in which it protrudes and protrudes with respect to the convex portion 60, and, like the convex portion 60, the inclined surface S ′ that protrudes downward from the upstream side to the downstream side in the document transport direction. Make. The top of the convex portion 60 is opposed to a midway portion of the inclined surface S ′.

本例では、厚くない原稿を通紙する際は図示のようにガイド部材６１がスプリング６２で付勢されて下方へ突出しており、通紙経路を狭いままに保っているが、厚手で剛性の高い原稿を通紙したときには、ガイド部材６１がスプリング６２の付勢力に抗して上昇し、搬送部の隙間が広くなる（スプリング６２の付勢力はそのような動作が可能なように適宜設定する）。したがって、原稿搬送部である通紙路が狭いために原稿がとまってしまうことはない。その他の構成、動作は図２の例と同様であるので説明を省略する。   In this example, when passing a document that is not thick, the guide member 61 is biased by a spring 62 and protrudes downward as shown in the figure, and the paper passing path is kept narrow, but it is thick and rigid. When a high original is passed, the guide member 61 rises against the urging force of the spring 62, and the clearance between the conveying portions is widened (the urging force of the spring 62 is appropriately set so that such operation is possible). ). Accordingly, the original does not stop because the paper passing path which is the original conveying section is narrow. Other configurations and operations are the same as those in the example of FIG.

図４は、本発明のさらに他の実施例における原稿読み取り部の拡大断面概略図である。この例は、ほとんどの構成は図３の例と同様であるが、凸形状部６０とガイド部材６１は、搬送する原稿の先端、後端を検知するセンサ６３よりも原稿搬送方向上流側に配置してある。   FIG. 4 is an enlarged schematic cross-sectional view of a document reading unit in still another embodiment of the present invention. In this example, most of the configuration is the same as that in the example of FIG. 3, but the convex portion 60 and the guide member 61 are arranged upstream of the sensor 63 for detecting the leading edge and trailing edge of the document to be transported. It is.

既に述べたように、原稿が狭い隙間である通紙路中で上下のどこを通るかによって原稿の検出タイミングに差が生じ、原稿先端、後端の位置を正確に検出できないことがあり得た。しかし本例では、凸形状部６０とガイド部材６１により曲折した通紙路が形成され、ガイド部材６１が原稿を下方へ押しつけ付勢することになる。したがって、原稿の通過位置はあまりばらつかず、センサ６３の検出タイミングにもあまり差が生じなくなる。   As described above, there is a difference in the detection timing of the original depending on where the original passes through the narrow paper gap, and the positions of the leading and trailing edges of the original may not be detected accurately. . However, in this example, a bent paper passing path is formed by the convex portion 60 and the guide member 61, and the guide member 61 presses and urges the document downward. Therefore, the passage position of the original does not vary so much and the difference in detection timing of the sensor 63 does not occur.

なお原稿の先端、後端を検知するセンサ６３には、一般的には透過型センサとフィラーを組み合わせたものと、反射型センサ（フィラーなし）のどちらかが用い得る。図示の例では透過型センサとフィラーからなるものを用いているが、本発明ではどちらでもよく、またこれらと異なる方式のものでもよい。   As the sensor 63 for detecting the leading edge and the trailing edge of the document, generally, either a combination of a transmission type sensor and a filler or a reflection type sensor (no filler) can be used. In the example shown in the figure, a transmissive sensor and a filler are used, but in the present invention, either may be used, or a different system may be used.

本発明の実施対象となる原稿読み取り装置と画像形成装置を示す概略断面図1 is a schematic cross-sectional view showing a document reading apparatus and an image forming apparatus that are targets for implementing the present invention. 本発明の一実施例における原稿読み取り部の拡大断面概略図FIG. 2 is an enlarged schematic cross-sectional view of a document reading unit according to an embodiment of the present invention. 本発明の他の実施例における原稿読み取り部の拡大断面概略図FIG. 6 is an enlarged schematic cross-sectional view of a document reading unit according to another embodiment of the present invention. 本発明のさらに他の実施例における原稿読み取り部の拡大断面概略図FIG. 6 is an enlarged schematic cross-sectional view of a document reading unit in still another embodiment of the present invention.

符号の説明Explanation of symbols

１１：読み取りユニット
１２：画像形成部
１３：自動原稿搬送装置（ＡＤＦ）
１４：原稿排紙トレイ
１５〜１８：給紙カセット
１９：給紙部
２０：排紙トレイ
２１：原稿台
２２：ピックアップローラ
２３：原稿搬送ベルト
２４：コンタクトガラス
２５：読み取り装置
２６：光源
２７：光学系
２８：光電変換素子
３０：感光体
３１：帯電装置
３２：書き込みユニット
３３：現像装置
３４：転写装置
３５：クリーニング装置
３６：定着装置
３７：排出ローラ対
５１：原稿読み取り部
５２、５４：原稿搬送用のローラ
５３、５５：加圧ローラ
５６：白圧板
５７：角パイプ材
５８：スプリング
５９：ガイド板
６０：凸形状部
６１：ガイド部材
６２：スプリング
６３：センサ
Ｌ：レーザ光
Ｐ：記録媒体
Ｓ、Ｓ’：傾斜面
Ｘ：光軸
11: Reading unit 12: Image forming unit 13: Automatic document feeder (ADF)
14: Document discharge trays 15 to 18: Paper cassette 19: Paper feed unit 20: Paper discharge tray 21: Document tray 22: Pickup roller 23: Document transport belt 24: Contact glass 25: Reading device 26: Light source 27: Optical System 28: photoelectric conversion element 30: photoconductor 31: charging device 32: writing unit 33: developing device 34: transfer device 35: cleaning device 36: fixing device 37: discharge roller pair 51: original reading unit 52, 54: original conveyance Rollers 53, 55: pressure roller 56: white pressure plate 57: square pipe material 58: spring 59: guide plate 60: convex portion 61: guide member 62: spring 63: sensor L: laser beam P: recording medium S , S ′: inclined surface X: optical axis

Claims (8)

シート状の原稿を搬送しつつ原稿面を読み取るシートスルー方式の原稿読み取り装置において、原稿読み取り部の原稿搬送方向上流側のガイド板が、搬送する原稿の原稿面に付着した修正液やボールペンの余剰インク等を掻き落とす掻き落とし形状部を有し、前記掻き落とし形状部に対して出没する方向に可動のガイド部材を設けてなることを特徴とする原稿読み取り装置。 In a sheet-through type document reading device that reads a document surface while conveying a sheet-like document, the guide plate on the upstream side in the document conveyance direction of the document reading unit has an excess of correction liquid or ballpoint pen attached to the document surface of the document to be conveyed It has a scraping shaped portion scrape ink or the like, the document reading device according to claim Rukoto such provided movable guide member in a direction infested with respect to the scraper-shaped portion. シート状の原稿を搬送しつつ原稿面を読み取るシートスルー方式の原稿読み取り装置において、原稿読み取り部の原稿搬送方向上流側のガイド板が、搬送する原稿の原稿面に付着した修正液やボールペンの余剰インク等を掻き落とす掻き落とし形状部を有し、前記掻き落とし形状部が、搬送する原稿の原稿面側に突出する凸形状を有し、前記掻き落とし形状部に対して出没する方向に可動のガイド部材を設けてなることを特徴とする原稿読み取り装置。 In a sheet-through type document reading device that reads a document surface while conveying a sheet-like document, the guide plate on the upstream side in the document conveyance direction of the document reading unit has an excess of correction liquid or ballpoint pen attached to the document surface of the document to be conveyed has a scraping shaped portion scrape ink, etc., the scraper-shaped section, have a convex shape protruding on the original surface of the original to be conveyed, the direction of the movable infested with respect to the scraper-shaped portion original reading apparatus according to claim Rukoto such is provided a guide member. シート状の原稿を搬送しつつ原稿面を読み取るシートスルー方式の原稿読み取り装置において、原稿読み取り部の原稿搬送方向上流側のガイド板が、搬送する原稿の原稿面に付着した修正液やボールペンの余剰インク等を掻き落とす掻き落とし形状部を有し、前記掻き落とし形状部が、原稿搬送方向上流から下流側へ向かうにつれて前記原稿の原稿面側へ突出する傾斜面を有し、前記掻き落とし形状部に対して出没する方向に可動のガイド部材を設けてなることを特徴とする原稿読み取り装置。 In a sheet-through type document reading device that reads a document surface while conveying a sheet-like document, the guide plate on the upstream side in the document conveyance direction of the document reading unit has an excess of correction liquid or ballpoint pen attached to the document surface of the document to be conveyed has a scraping shaped portion scrape ink, etc., the scraper-shaped section, have a slanted surface that protrudes to the document surface of the document toward the downstream side from the document conveying direction upstream, the scraper-shaped portion original reading apparatus according to claim Rukoto such provided movable guide member in a direction infested respect. 請求項１ないし３のいずれかの原稿読み取り装置において、前記ガイド部材が、原稿搬送方向上流側から下流側へ向かうにつれて前記原稿の原稿面側へ突出する傾斜面を有することを特徴とする原稿読み取り装置。 In any of the document reading apparatus according to claim 1, wherein the guide member, characterized in Rukoto to have a slanted surface that protrudes to the document surface of the document toward the document transport direction upstream side to the downstream side Document reading device. 請求項４の原稿読み取り装置において、前記掻き落とし形状部と前記ガイド部材の傾斜面が原稿搬送方向上流側に向かって広く、原稿搬送方向下流側に向かって狭まる搬送路形状を形成することを特徴とする原稿読み取り装置。 In document reading apparatus according to claim 4, the inclined surface of the guide member and the scraping-shaped portion is wider toward the originals upstream side to form a conveying path shape which narrows I suited the document conveying direction downstream side A document reading apparatus characterized by that. 請求項５の原稿読み取り装置において、前記掻き落とし形状部の頂部と前記ガイド部材の傾斜面の途中部位に対向することを特徴とする原稿読み取り装置。 6. The document reading device according to claim 5, wherein the top portion of the scraped-off shape portion faces the middle portion of the inclined surface of the guide member. 請求項１ないし３のいずれかの原稿読み取り装置において、前記掻き落とし形状部と前記ガイド部材を、搬送する原稿の先端、後端を検知するセンサ部の原稿搬送方向上流側に配置してなることを特徴とする原稿読み取り装置。 In any of the document reading apparatus of claims 1 to 3, the guide member and the scraping-shaped portion, the distal end of the original to be conveyed, that Do disposed in the document conveying direction upstream side of the sensor portion detects the trailing edge A document reading apparatus characterized by that. 請求項１ないし７のいずれかの画像読み取り装置を有することを特徴とする画像形成装置。
 An image forming apparatus comprising Rukoto of having a one of the image reading apparatus of claims 1 to 7.
JP2003422228A 2003-12-19 2003-12-19 Document reading apparatus and image forming apparatus using the same Expired - Fee Related JP4160895B2 (en)

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