JP3745929B2 - Document reader - Google Patents

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Publication number
JP3745929B2
JP3745929B2 JP34766299A JP34766299A JP3745929B2 JP 3745929 B2 JP3745929 B2 JP 3745929B2 JP 34766299 A JP34766299 A JP 34766299A JP 34766299 A JP34766299 A JP 34766299A JP 3745929 B2 JP3745929 B2 JP 3745929B2
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JP
Japan
Prior art keywords
pressure plate
document
white pressure
white
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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JP34766299A
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Japanese (ja)
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JP2001169047A (en
Inventor
秀規 末岡
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Ricoh Co Ltd
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Ricoh Co Ltd
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Priority to JP34766299A priority Critical patent/JP3745929B2/en
Publication of JP2001169047A publication Critical patent/JP2001169047A/en
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Publication of JP3745929B2 publication Critical patent/JP3745929B2/en
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  • Image Input (AREA)
  • Processing Or Creating Images (AREA)
  • Facsimiles In General (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、ファクシミリ装置、複写機の自動原稿給送装置、スキャナ装置等に適用される原稿読取装置に関する。
【0002】
【従来の技術】
図5は従来の自走原稿読取装置の要部構成を示す説明図であり、1は原稿を画像読取位置に搬送するフィードローラ、2はフィードローラ1に当接して用紙を1枚ずつ分離させるフリクションリバースローラ、3は装置本体にセットされた原稿をフィードローラ1に搬送するピックアップローラ、4はフィードローラ1を通過した原稿を搬送する読取ローラ、5は読取ローラ4に当接する読取加圧ローラ、6は画像読取手段における画像読取位置に備えられたコンタクトガラス、7は、コンタクトガラス6に対向配置され、画像読取手段における白基準となる白圧板、8は白圧板7を上下動可能に支持する角パイプ、9はコンタクトガラス6を通過した原稿を外部に排紙する排紙ローラ、10は排紙ローラ9に当接する排紙加圧ローラ、11は、原稿の上側をガイドし、フリクションリバースローラ2、読取ローラ4、白圧板7を支持する角パイプ8および排紙ローラ9を備えた原稿上側ガイド板、12は、原稿の下側をガイドし、フィードローラ1、読取加圧ローラ5、コンタクトガラス6を有する画像読取手段および排紙加圧ローラ10を備えた原稿下側ガイド板を示す。
【0003】
原稿上側ガイド板11におけるコンタクトガラス6に対向する部位には、凹部11aが形成されており、この凹部11aに白圧板7および角パイプ8が設置されている。コンタクトガラス6と白圧板7との間にはスペーサ(図示せず)が設けられており、このスペーサによってコンタクトガラス6と白圧板7との隙間が一定に保たれる。また、白圧板7における原稿搬送方向上流側の端部には上側に曲げ加工を施すことによる曲げ部7aが形成されており、この曲げ部7aの先端は、原稿上側ガイド板11における凹部11aの壁面部分に対向している。
【0004】
装置本体にセットされた原稿は、ピックアップローラ3によって最下位の原稿からフィードローラ1に搬送される。この時、複数枚同時に搬送された場合にはフリクションリバースローラ2によって分離されて最下位の原稿のみが搬送される。フィードローラ1および読取ローラ4を通過した原稿はコンタクトガラス6に搬入される。その際、原稿上側ガイド板11のガイド機能が凹部11aの部位において失われることになるが、凹部11aの部位における原稿のガイドは上下側ガイド板11,12から白圧板7の曲げ部7aに受け継がれ、原稿の先端が曲げ部7aに当接し、曲げ部7aの傾斜に沿ってコンタクトガラス6と白圧板7との隙間にガイドされる。
【0005】
そして、原稿がコンタクトガラス6と白圧板7との隙間を通過する際に、画像読取手段によって原稿の画像が光学的に読み取られ、コンタクトガラス6を通過した原稿は排紙ローラ9によって外部に排出される。
【0006】
【発明が解決しようとする課題】
従来技術においては白圧板7が原稿上側ガイド板11との継ぎを滑らかにするため、曲げ部7aを鈍角にすることは公知である。またマイラ(デュポン社の商品名)素材の白圧板7に代わる材質がないことが現状である。そのため、原稿上側ガイド板11との継ぎの滑らかさは白圧板7における曲げ部7aを形成する精度に頼っている。
【0007】
ところが、加工上マイラの曲げは精度が悪く、輸送や保管上も変形の注意を要する。また、曲げ角度が90°に近いと図6に示すように白圧板の曲げ部7aに原稿が引っ掛かりやすくなり、曲げ角度が180°に近いと図7に示すように白圧板7の端部に原稿が引っ掛かるような現象が生じるおそれがあり、どちらの場合においても搬送不良(主にジャム)を起こし易くなる。その対策として曲げ部7aの曲げ角度を管理することが行われてきたが白圧板7の曲げ部7a角度を管理することは、輸送上、保管上、ひいては経時的にも困難で、手間とコストがかかっていた。
【0008】
本発明では、このような問題点を解決し、白圧板の曲げ角の精度を安定させてガイド板から白圧板へのガイドの受け継ぎを円滑に行うことができる構成を容易かつ安価に実現することによって搬送不良を低減させた原稿読取装置を提供することを目的とする。
【0009】
【課題を解決するための手段】
前記目的を達成するための本発明は、コンタクトガラスを有し、このコンタクトガラスを通過する原稿の画像を読み取る画像読取部と、前記コンタクトガラス上を通過させるように原稿をガイドする上下のガイド板と、前記コンタクトガラス上に配置され、白レベル基準となる白圧板とを有する原稿読取装置において、前記ガイド板を通過した原稿の先端を前記白圧板と前記コンタクトガラスとの間にガイドするために、前記白圧板における原稿搬送方向上流側の端部に曲げ部を形成し、さらに、前記上ガイド板における前記白圧板に対して原稿搬送方向上流側の部位に一端部が貼り付けられ、かつ他端が前記上ガイド板から前記白圧板の前記曲げ部の端部下方に延在し、前記上ガイド板から前記白圧板に原稿をガイドする可撓性部材からなる白圧板継ぎガイド板を設けたことを特徴とする。このように構成したことにより、原稿の先端が曲げ部の傾斜面に当接するように白圧板継ぎガイド板が原稿をガイドし、曲げ部の傾斜面に当接した原稿は曲げ部によって白圧板とコンタクトガラスの間にガイドされる。そのため、白圧板の曲げ角度が多少変化しても、可撓性を有する白圧板継ぎガイド板が白圧板の曲げ部に原稿のガイドを円滑に受け継がせることができるため、白圧板の曲げ精度を緩くすることができ、しかも可撓性部材からなる白圧板継ぎガイド板は上ガイド板に貼り付けることで容易に設置することができる。
【0014】
【発明の実施の形態】
以下、本発明の実施形態について、図面を参照しながら詳細に説明する。
【0015】
図1は本発明の実施形態における装置の要部構成を示す説明図であり、13は継ぎ部である白圧板継ぎガイド板を示す。白圧板継ぎガイド板13は、例えばマイラ(商品名)のような可撓性部材から構成されている。図5に示す従来技術における部材と同一または同一機能の部材については同一の符号を付して詳細な説明は省略する。
【0016】
実施形態の装置は、図5に示す従来の装置における白圧板7の原稿搬送方向上流側に位置する原稿上側ガイド部11の凹部11aの角部に白圧板継ぎガイド板13の一端部を貼り付け、他端部を曲げ部7aの下方に延出させて、白圧板継ぎガイド板13の先端部が曲げ部7aにオーバーラップするように構成したものである。
【0017】
このように構成したことにより、図7のように白圧板の曲げ角度が180°に近い鈍角になった場合でも、白圧板継ぎガイド板13から白圧板7に確実にガイドが受け継がれるため、搬送不良を起こすことがなくなる。その結果、曲げ部7aの角度を設定する際の公差を緩めることができるので、白圧板7の曲げ角度の管理が容易かつ安価になる。
【0018】
図2は参考例における装置の要部構成を示す説明図であり、14は白圧板7(曲げ部7a)の先端を引っ掛ける引掛け爪を示す。
【0019】
参考例の装置は、図1に示す実施形態の装置における白圧板継ぎガイド板13を貼着する代わりに、凹部11aの原稿搬送方向上流側の角部に引掛け爪14を立設させ、引掛け爪14の先端部が曲げ部7aにオーバーラップするように構成したものである。
【0020】
図3は原稿上側ガイド板に対する白圧板の組付構造を示す斜視図であり、11bは原稿上側ガイド板11の凹部11aにおける長手方向に対向する側部の少なくとも一方を開放した開口部を示す。
【0021】
組み付けの際には、開口部11bに白圧板7および角パイプ8の側部を対向させて、白圧板7の先端を引掛け爪14にオーバーラップさせた状態で凹部11aに、原稿搬送方向に対して直角方向にスライドさせて挿入することにより、原稿上側ガイド板11に白圧板7が組み付けられる。
【0022】
このように構成したことにより、引掛け爪14と原稿上側ガイド板11とが一体に構成されているため、継ぎ部を構成する部品点数を削減することができる。さらに、引掛け爪14から白圧板7に確実にガイドが受け継がれるため、搬送不良を起こすことがなくなる。また、曲げ部7aの角度が大きくなると引掛け爪14に白圧板7の先端が当接するために、曲げ部7aの角度が規定される。その結果、曲げ部7aの角度を設定する際の公差を緩めることができるので、白圧板7の曲げ角度の管理が容易かつ安価になる。
【0023】
また、原稿上側ガイド板11の側部から白圧板7および角パイプ8をスライドさせて組み付け可能であるため、原稿上側ガイド板11の上側(または下側)から組み付けるよりも作業しやすく、しかも、組み付け時に白圧板7に加わる負荷を低減することができる。
【0024】
図4は図2に示す装置に他の原稿上側ガイド板を装着した際の要部構成を示す説明図である。なお、図2に示す参考例における部材と同一または同一機能の部材については同一の符号を付して詳細な説明は省略する。
【0025】
図4に示す装置の原稿上側ガイド板11は、図2に示す装置の原稿上側ガイド板11の凹部11aの底面における引掛け爪14の対向部位に孔部11cが形成されたものである。
【0026】
ところで、図2に示す装置の原稿上側ガイド板11を製造する場合、特に凹部11aを形成する場合、引掛け爪14が存在するために凹部11aから金型を抜き出しにくくなる。そこで、凹部11aを形成する金型とは別に引掛け爪14の部分を他の金型を押し込むことによって形成することにより、金型が抜けやすくなり、容易に引掛け爪14が形成されるようになる。孔部11cは他の金型を押し込むことによって形成されたものである。
【0027】
このように製造することにより、原稿上側ガイド板11がより安価に作成することが可能になる。
【0028】
【発明の効果】
以上、説明したように構成された本発明によれば、白圧板の曲げ精度を緩くすることができ、より安価でかつ搬送性が良好な原稿読取装置を提供することができる。
【図面の簡単な説明】
【図1】 本発明の実施形態における装置の要部構成を示す説明図
【図2】 参考例における装置の要部構成を示す説明図
【図3】 原稿上側ガイド板に対する白圧板の組付構造を示す斜視図
【図4】 図2に示す装置に他の原稿上側ガイド板を装着した際の要部構成を示す説明図
【図5】 従来の自走原稿読取装置の要部構成を示す説明図
【図6】 白圧板の曲げ角度が90°に近い場合における原稿の搬送不良の例を示す説明図
【図7】 白圧板の曲げ角度が180°に近い場合における原稿の搬送不良の例を示す説明図
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a document reading device applied to a facsimile machine, an automatic document feeder for a copying machine, a scanner device, and the like.
[0002]
[Prior art]
FIG. 5 is an explanatory view showing the configuration of the main part of a conventional self-running document reading apparatus. Reference numeral 1 denotes a feed roller for conveying the document to the image reading position, and 2 abuts the feed roller 1 to separate the sheets one by one. Friction reverse roller, 3 is a pickup roller that conveys a document set on the apparatus main body to the feed roller 1, 4 is a reading roller that conveys the document that has passed through the feed roller 1, and 5 is a reading pressure roller that contacts the reading roller 4. , 6 is a contact glass provided at an image reading position in the image reading means, 7 is a white pressure plate which is arranged to face the contact glass 6 and serves as a white reference in the image reading means, and 8 is a white pressure plate 7 which supports the white pressure plate 7 so as to be movable up and down. A square pipe 9, a discharge roller 9 for discharging the document that has passed through the contact glass 6 to the outside, and a discharge pressure roller 11 for contacting the discharge roller 9. An upper document guide plate 12 that includes an upper side of the document, a friction reverse roller 2, a reading roller 4, a square pipe 8 that supports the white pressure plate 7 and a paper discharge roller 9, 12 guides the lower side of the document, An original document lower guide plate including a feed roller 1, a reading pressure roller 5, an image reading unit having a contact glass 6, and a paper discharge pressure roller 10 is shown.
[0003]
A concave portion 11a is formed in a portion of the document upper guide plate 11 facing the contact glass 6, and a white pressure plate 7 and a square pipe 8 are installed in the concave portion 11a. A spacer (not shown) is provided between the contact glass 6 and the white pressure plate 7, and the gap between the contact glass 6 and the white pressure plate 7 is kept constant by this spacer. In addition, a bent portion 7a is formed by bending the upper side of the white pressure plate 7 on the upstream side in the document conveying direction, and the tip of the bent portion 7a is formed at the concave portion 11a of the document upper guide plate 11. It faces the wall part.
[0004]
The original set on the apparatus main body is conveyed from the lowest original to the feed roller 1 by the pickup roller 3. At this time, when a plurality of sheets are conveyed at the same time, they are separated by the friction reverse roller 2 and only the lowermost document is conveyed. The document that has passed through the feed roller 1 and the reading roller 4 is carried into the contact glass 6. At this time, the guide function of the document upper guide plate 11 is lost in the concave portion 11a, but the document guide in the concave portion 11a is inherited from the upper and lower guide plates 11 and 12 to the bent portion 7a of the white pressure plate 7. Then, the leading edge of the document comes into contact with the bent portion 7a and is guided in the gap between the contact glass 6 and the white pressure plate 7 along the inclination of the bent portion 7a.
[0005]
When the original passes through the gap between the contact glass 6 and the white pressure plate 7, the image of the original is optically read by the image reading means, and the original that has passed through the contact glass 6 is discharged to the outside by the paper discharge roller 9. Is done.
[0006]
[Problems to be solved by the invention]
In the prior art, it is known that the bending portion 7a has an obtuse angle in order for the white pressure plate 7 to smoothly join the original upper guide plate 11. Further, there is no material that can replace the white pressure plate 7 made of Mylar (a product name of DuPont). Therefore, the smoothness of the joint with the document upper guide plate 11 depends on the accuracy of forming the bent portion 7 a in the white pressure plate 7.
[0007]
However, bending of mylar is not accurate for processing, and it is necessary to pay attention to deformation during transportation and storage. Further, when the bending angle is close to 90 °, the document is easily caught on the bending portion 7a of the white pressure plate as shown in FIG. 6, and when the bending angle is close to 180 °, the end of the white pressure plate 7 is shown as shown in FIG. There is a possibility that a document may be caught, and in either case, conveyance failure (mainly jamming) is likely to occur. As a countermeasure, the bending angle of the bending portion 7a has been managed. However, it is difficult to manage the bending portion 7a angle of the white pressure plate 7 in terms of transportation, storage, and over time. It was over.
[0008]
In the present invention, it is possible to easily and inexpensively realize a configuration capable of solving such problems and stabilizing the bending angle accuracy of the white pressure plate and smoothly transferring the guide from the guide plate to the white pressure plate. An object of the present invention is to provide a document reading apparatus in which defective conveyance is reduced.
[0009]
[Means for Solving the Problems]
To achieve the above object, the present invention includes a contact glass, an image reading unit that reads an image of a document that passes through the contact glass, and upper and lower guide plates that guide the document so as to pass through the contact glass. And a white pressure plate that is disposed on the contact glass and serves as a white level reference, for guiding the leading edge of the document that has passed through the guide plate between the white pressure plate and the contact glass. A bent portion is formed at the upstream end of the white pressure plate in the document conveying direction , and one end is attached to a portion of the upper guide plate on the upstream side of the document conveying direction with respect to the white pressure plate. end extends to an end portion below the bending portion of the white plate from said upper guide plate, a flexible member for guiding the document into the white plate from said upper guide plate Characterized in that a white plate joint guide plate. With this configuration, the white pressure plate joint guide plate guides the original so that the leading end of the original comes into contact with the inclined surface of the bent portion, and the original that has come into contact with the inclined surface of the bent portion is separated from the white pressure plate by the bent portion. Guided between contact glasses. Therefore, even if the bending angle of the white pressure plate changes slightly, the flexible white pressure plate joint guide plate can smoothly transfer the document guide to the bending portion of the white pressure plate, so that the white plate can be accurately bent. It can be loosely, yet white plate joint guide plate made of a flexible member Ru can be easily installed by pasting the upper guide plate.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
Figure 1 is an explanatory diagram showing a main configuration of the device in the implementation of the invention, 13 denotes a white plate joint guide plate is Joint. The white pressure plate joint guide plate 13 is made of a flexible member such as Mylar (trade name) . Members having the same or the same function as those in the prior art shown in FIG. 5 are given the same reference numerals and detailed description thereof is omitted.
[0016]
In the apparatus of the present embodiment, one end portion of the white pressure plate joint guide plate 13 is attached to the corner of the concave portion 11a of the upper document guide portion 11 located upstream of the white pressure plate 7 in the document conveying direction in the conventional device shown in FIG. The other end portion extends below the bent portion 7a, and the tip portion of the white pressure plate joint guide plate 13 is configured to overlap the bent portion 7a.
[0017]
With this configuration, even when the bending angle of the white pressure plate becomes an obtuse angle close to 180 ° as shown in FIG. 7, the guide is reliably inherited from the white pressure plate joint guide plate 13 to the white pressure plate 7. No defects will occur. As a result, since the tolerance at the time of setting the angle of the bent portion 7a can be relaxed, the bending angle of the white pressure plate 7 can be easily and inexpensively managed.
[0018]
FIG. 2 is an explanatory view showing the main configuration of the apparatus in the reference example , and 14 shows a hooking claw for hooking the tip of the white pressure plate 7 (bending portion 7a).
[0019]
The apparatus of the reference example, instead of attaching a white plate joint guide plate 13 in the apparatus of the implementation form is shown in Fig 1, is erected hooking pawls 14 at the corners of the original conveying direction upstream side of the recess 11a The tip of the hooking claw 14 is configured to overlap the bent portion 7a.
[0020]
FIG. 3 is a perspective view showing an assembling structure of the white pressure plate with respect to the document upper guide plate, and 11b shows an opening in which at least one of the side portions opposed to the longitudinal direction in the concave portion 11a of the document upper guide plate 11 is opened.
[0021]
When assembling, the sides of the white pressure plate 7 and the square pipe 8 are opposed to the opening 11b, and the tip of the white pressure plate 7 is overlapped with the hooking claws 14 in the recess 11a in the document transport direction. The white pressure plate 7 is assembled to the document upper guide plate 11 by sliding it in a direction perpendicular to the original.
[0022]
With this configuration, the hooking claw 14 and the document upper guide plate 11 are integrally configured, so that the number of parts constituting the joint portion can be reduced. Further, since the guide is reliably inherited from the hooking claw 14 to the white pressure plate 7, no conveyance failure occurs. Further, when the angle of the bent portion 7a increases, the tip of the white pressure plate 7 comes into contact with the hooking claw 14, so that the angle of the bent portion 7a is defined. As a result, since the tolerance at the time of setting the angle of the bent portion 7a can be relaxed, the bending angle of the white pressure plate 7 can be easily and inexpensively managed.
[0023]
Further, since the white pressure plate 7 and the square pipe 8 can be slid and assembled from the side of the document upper guide plate 11, it is easier to work than assembling from the upper side (or the lower side) of the document upper guide plate 11, and The load applied to the white pressure plate 7 during assembly can be reduced.
[0024]
FIG. 4 is an explanatory view showing a configuration of a main part when another upper document guide plate is mounted on the apparatus shown in FIG. In addition, the same code | symbol is attached | subjected about the member same or the same function as the member in the reference example shown in FIG. 2, and detailed description is abbreviate | omitted.
[0025]
The document upper guide plate 11 of the apparatus shown in FIG. 4 has a hole portion 11c formed at a portion of the bottom surface of the recess 11a of the document upper guide plate 11 of the apparatus shown in FIG.
[0026]
When manufacturing the document upper guide plate 11 of the apparatus shown in FIG. 2, particularly when the recess 11a is formed, it is difficult to extract the mold from the recess 11a because the hooking claws 14 are present. Therefore, by forming the portion of the hooking claw 14 separately from the die that forms the recess 11a by pushing another die, the die can be easily removed and the hooking claw 14 can be easily formed. become. The hole 11c is formed by pushing another mold.
[0027]
By manufacturing in this way, the document upper guide plate 11 can be produced at a lower cost.
[0028]
【The invention's effect】
As described above, according to the present invention configured as described above, it is possible to provide a manuscript reading apparatus that can reduce the bending accuracy of the white pressure plate, is less expensive, and has good transportability.
[Brief description of the drawings]
Figure 1 is an explanatory diagram [2] with a set of white plate for illustration Figure 3 document upper guide plate showing the main configuration of the apparatus in reference example showing the main configuration of the device in the implementation of the invention FIG. 4 is a perspective view showing the structure. FIG. 4 is an explanatory view showing a main part configuration when another upper document guide plate is mounted on the apparatus shown in FIG. 2. FIG. 5 shows a main part structure of a conventional self-running document reading apparatus. FIG. 6 is an explanatory diagram showing an example of document conveyance failure when the white pressure plate bending angle is close to 90 °. FIG. 7 is an example of document conveyance failure when the white pressure plate bending angle is close to 180 °. Explanatory drawing showing

Claims (1)

コンタクトガラスを有し、このコンタクトガラスを通過する原稿の画像を読み取る画像読取部と、前記コンタクトガラス上を通過させるように原稿をガイドする上下のガイド板と、前記コンタクトガラス上に配置され、白レベル基準となる白圧板とを有する原稿読取装置において、
前記ガイド板を通過した原稿の先端を前記白圧板と前記コンタクトガラスとの間にガイドするために、前記白圧板における原稿搬送方向上流側の端部に曲げ部を形成し、さらに、前記上ガイド板における前記白圧板に対して原稿搬送方向上流側の部位に一端部が貼り付けられ、かつ他端が前記上ガイド板から前記白圧板の前記曲げ部の端部下方に延在し、前記上ガイド板から前記白圧板に原稿をガイドする可撓性部材からなる白圧板継ぎガイド板を設けたことを特徴とする原稿読取装置。
An image reading unit that has a contact glass and reads an image of a document that passes through the contact glass; upper and lower guide plates that guide the document so as to pass through the contact glass; and a white glass disposed on the contact glass. In a document reading apparatus having a white pressure plate as a level reference,
In order to guide the leading edge of the document that has passed through the guide plate between the white pressure plate and the contact glass, a bent portion is formed at the upstream end of the white pressure plate in the document conveyance direction, and the upper guide One end of the plate is attached to the upstream side of the white pressure plate with respect to the white pressure plate , and the other end extends from the upper guide plate below the end of the bent portion of the white pressure plate. An original reading apparatus comprising a white pressure plate joint guide plate made of a flexible member for guiding an original from a guide plate to the white pressure plate.
JP34766299A 1999-12-07 1999-12-07 Document reader Expired - Lifetime JP3745929B2 (en)

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JP34766299A JP3745929B2 (en) 1999-12-07 1999-12-07 Document reader

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JP34766299A JP3745929B2 (en) 1999-12-07 1999-12-07 Document reader

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JP3745929B2 true JP3745929B2 (en) 2006-02-15

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JP5403421B2 (en) * 2009-10-29 2014-01-29 株式会社リコー Image reading apparatus and image forming apparatus

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