JP2006035635A - Belt conveyer and image forming apparatus using it - Google Patents

Belt conveyer and image forming apparatus using it Download PDF

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JP2006035635A
JP2006035635A JP2004218668A JP2004218668A JP2006035635A JP 2006035635 A JP2006035635 A JP 2006035635A JP 2004218668 A JP2004218668 A JP 2004218668A JP 2004218668 A JP2004218668 A JP 2004218668A JP 2006035635 A JP2006035635 A JP 2006035635A
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belt
guide plate
gap
recording head
image forming
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JP2006035635A5 (en
JP4265787B2 (en
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Shingo Masaoka
心吾 正岡
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Ricoh Co Ltd
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Ricoh Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent a formed image from being deteriorated by attaining a gap by which an image forming means and a paper sheet are not brought into contact with each other by a method wherein a protruding amount of a guide plate for projecting a conveyance belt to the side of the image forming means is adjusted. <P>SOLUTION: A recording head 5 is provided to be opposed to the conveyance belt 3 in a range of a string of the conveyance belt 3 in a horizontal direction and the conveyance belt 3 is projected toward the recording head 5 from inside by the guide plate 6, and then a paper sheet S or the like is precisely positioned to make an adequate gap G suitable for forming a high-quality image. When the amount of the gap G is changed to be greater, a guide plate adjustment member 7 is slidden in the left direction, and then a slant face of a trapezoidal projection 6a of the guide plate 6 is slipped down on a slant face of a trapezoidal projection 7a of the guide plate adjustment member 7 so that the gap G<SB>L</SB>is expanded to be the gap G<SB>S</SB>. As a result, an envelope, a paper sheet having curling, or a thick paper sheet does not contact the recording head 5 when being conveyed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ベルト搬送装置及び該ベルト搬送装置を用いた画像形成装置に関し、さらに詳しくは、高精度用紙搬送装置を有するファクシミリ装置、複写装置、プリンタ等に用いられ、画像形成が行われる用紙が封筒のような表面が一定でないもの、折り癖がついていたり、厚手であるような場合においても、画像形成動作中に用紙が画像形成手段と接触して、形成される画像が劣化することがないベルト搬送装置及び画像形成装置に関する。   The present invention relates to a belt conveyance device and an image forming apparatus using the belt conveyance device. More specifically, the present invention relates to a facsimile machine, a copying apparatus, a printer, or the like having a high-precision paper conveyance device, and a sheet on which image formation is performed. Even when the surface is not constant, such as an envelope, or when it is folded or thick, the paper does not come into contact with the image forming means during the image forming operation and the formed image does not deteriorate. The present invention relates to a belt conveyance device and an image forming apparatus.

インクジェット記録方式で記録用紙上に画像を形成する画像形成装置において、少なくとも2本のローラによって張架されるベルトに用紙を密着させて搬送するベルト搬送装置では、記録ヘッドと対峙するベルトの弦の部分にガイド板を設置し、ガイド板によってベルトを記録ヘッド側に張り出すようにして、ベルトの姿勢を平滑に支持し、搬送される用紙の平面度を確保することが行われている。このようなベルト搬送装置では、ベルトの平面性を確保した記録ヘッドの領域で用紙に画像が形成されるが、その画質を良好なものとするために、一般的にベルトと記録ヘッド間のギャップ(間隙)を狭く、かつ高精度に保持する。   In an image forming apparatus that forms an image on a recording sheet by an ink jet recording method, a belt conveying apparatus that conveys a sheet in close contact with a belt stretched by at least two rollers, the string of the belt facing the recording head A guide plate is installed in the portion, and the belt is projected to the recording head side by the guide plate to smoothly support the posture of the belt and ensure the flatness of the conveyed paper. In such a belt conveyance device, an image is formed on the paper in the area of the recording head that secures the flatness of the belt. In order to improve the image quality, a gap between the belt and the recording head is generally used. (Gap) is kept narrow and highly accurate.

また、インクジェット記録装置において、紙詰まりを生じることなく記録紙を搬送可能とし、かつ記録紙にたるみやしわがあっても、また厚さが異なっても高品質の画像記録を可能とするため、記録ヘッドによる記録位置の上流近傍に記録紙の上面位置を規制する上部ガイド板を定位置に設け、記録位置の下方に下部ガイド板を上下動するように配置し、記録紙の搬送時には下部ガイド板を降下させ、上部ガイド板との間隔を広くして紙詰まりを防止し、記録ヘッドによる記録時には下部ガイド板を上昇させて記録紙を上部ガイド板に押し付け、記録ヘッドから一定距離の位置に平坦な状態で保持するようにしたものが、特許文献1に開示されている。   In addition, in the ink jet recording apparatus, it is possible to transport the recording paper without causing a paper jam, and even if there is slack or wrinkle on the recording paper or the thickness is different, high quality image recording is possible. An upper guide plate that regulates the upper surface position of the recording paper is provided at a fixed position near the upstream of the recording position by the recording head, and the lower guide plate is arranged to move up and down below the recording position. Lower the plate and widen the gap with the upper guide plate to prevent paper jamming.When recording with the recording head, raise the lower guide plate and press the recording paper against the upper guide plate to keep it at a certain distance from the recording head. A device that is held in a flat state is disclosed in Patent Document 1.

また、インクジェット記録装置において、記録ヘッドと記録用紙との接触を防止するとともに、異常解消のための各種処置を容易に行なうことを可能にし、さらに、通常動作時の記録ヘッドと記録用紙との間隔を詰めることにより画像品質の向上を図るため、記録部において記録用紙の紙浮きや紙送り不良等の異常が発生したことを検出した場合に、記録ヘッドの主走査移動を停止するとともに記録ヘッドと被記録材とを離間させ、その後、記録ヘッドをホームポジションへ移動させるようにしたものが、特許文献2に開示されている。
特開平08−267857号公報 特開平05−262019号公報
Further, in the ink jet recording apparatus, it is possible to prevent contact between the recording head and the recording paper, and to easily perform various measures for eliminating the abnormality, and further, the interval between the recording head and the recording paper during normal operation. In order to improve the image quality by reducing the size of the recording head, when it is detected in the recording section that an abnormality such as paper float or paper feed failure has occurred, the main scanning movement of the recording head is stopped and the recording head Japanese Patent Application Laid-Open No. H10-228561 discloses a configuration in which the recording material is separated from the recording material and then the recording head is moved to the home position.
Japanese Patent Laid-Open No. 08-267857 Japanese Patent Laid-Open No. 05-262019

前記したような搬送ベルトによって用紙を搬送する従来の記録装置においては、ベルトの平面性を確保した領域で記録媒体である用紙に画像を形成するが、その画質を良好なものとするために、ベルトと記録ヘッドとのギャップは狭く、かつ高精度に保持する。ここで、記録媒体が封筒や折り癖のついたものである場合や厚手のものである場合には、記録媒体が画像形成手段である記録ヘッドと接触して、形成される画像が劣化する。
そこで、請求項1の発明は、搬送ベルトを画像形成手段側に張り出させているガイド板の張り出し量を調整することにより、画像形成手段と用紙が接触しないギャップを確保し、形成する画像の劣化を防止することを目的とする。
In the conventional recording apparatus that transports the paper by the transport belt as described above, an image is formed on the paper that is a recording medium in an area in which the flatness of the belt is ensured, but in order to improve the image quality, The gap between the belt and the recording head is narrow and kept with high accuracy. Here, when the recording medium is an envelope or a crease or a thick one, the recording medium comes into contact with the recording head as the image forming means, and the formed image deteriorates.
In view of this, the invention according to claim 1 secures a gap where the image forming unit and the sheet do not contact each other by adjusting the amount of extension of the guide plate that projects the conveying belt to the image forming unit side. The purpose is to prevent deterioration.

搬送ベルトの弦に平面性を確保するために設けたガイド板は、その平面性に加えて、対峙する画像形成手段とのギャップを高精度に確保することが要求される。すなわち、ガイド板自体の高度な平面性が要求され、かつガイド板の支持位置も高精度に保持することが要求される。ガイド板の位置を可変にして記録媒体である用紙と画像形成手段とのギャップを確保する装置の場合、ガイド板の高い動作精度が要求されることになる。このような要求を満足させようとすると、ベルト搬送装置を構成する部品の点数が増え、その精度も高いものとなるのでコストアップの原因となる。
そこで、請求項2の発明は、ガイド板を動作させて画像形成手段とのギャップを確保する際に、ガイド板の構成精度が用紙の搬送及び画像形成に影響しない位置まで逃げることで、用紙の平面性は、ベルトを支持するローラの接点を結ぶ線分(弦)によって確保し、ガイド板を動作する機構を単純な構成とし、コストダウンを図ることを目的とする。
In addition to the flatness, the guide plate provided to ensure the flatness on the strings of the conveying belt is required to ensure a gap with the image forming means facing each other with high accuracy. That is, a high level of flatness of the guide plate itself is required, and the support position of the guide plate is also required to be held with high accuracy. In the case of an apparatus that secures a gap between a sheet as a recording medium and an image forming unit by changing the position of the guide plate, high operation accuracy of the guide plate is required. If it is going to satisfy such a request | requirement, the number of parts which comprise a belt conveying apparatus will increase, and the precision will also become high, causing a cost increase.
Accordingly, when the guide plate is operated to secure a gap with the image forming means, the guide plate escapes to a position where the configuration accuracy of the guide plate does not affect the sheet conveyance and image formation. The flatness is ensured by a line segment (string) connecting the contact points of the rollers that support the belt, and the purpose is to reduce the cost by making the mechanism for operating the guide plate simple.

画像形成手段と記録媒体である用紙間のギャップによって、得られる画質は大きな影響を受けるが、一般に画像形成手段と用紙間のギャップは、小さいほどその画質は良好なものとなる。すなわち、適正なギャップを維持することが高画質画像形成には重要である。
封筒や癖の強い用紙を搬送させ、そのとき所定量のギャップが確保できるようにガイド板を逃がす構成にした場合、ガイド板を逃がす前の状態では画像形成手段と接触するような厚手の用紙に画像を形成しようとしてギャップを広く調整すると、その状態で得られる画質はそのギャップ精度から期待する高画質なものになるとは限らない。
そこで、請求項3の発明は、請求項1、2の発明の目的に加え、用紙に応じた最適のギャップを確保して、高画質な画像を形成することを目的とする。
The obtained image quality is greatly affected by the gap between the image forming unit and the recording medium, but generally, the smaller the gap between the image forming unit and the sheet, the better the image quality. That is, maintaining an appropriate gap is important for high-quality image formation.
If the guide plate is released so that a certain amount of gap can be secured at that time, a sheet with strong envelopes or wrinkles is transported. If the gap is adjusted broadly in order to form an image, the image quality obtained in that state is not always the high image quality expected from the gap accuracy.
Accordingly, an object of the third aspect of the invention is to form an image with high image quality by securing an optimum gap according to the sheet in addition to the objects of the first and second aspects of the invention.

請求項4の発明は、請求項1〜3の発明のベルト搬送装置を用いて、ガイド板を画像形成手段側に張り出させ、搬送ベルトを画像形成手段側に張り出させることにより、画像形成手段と用紙が接触しないギャップを確保し、画像形成手段が形成する画像が劣化しない画像形成装置を提供することを目的とする。   According to a fourth aspect of the present invention, by using the belt conveying device according to the first to third aspects of the present invention, the guide plate is projected to the image forming means side, and the conveying belt is projected to the image forming means side, thereby forming an image. It is an object of the present invention to provide an image forming apparatus that secures a gap where the means and the paper do not contact each other and does not deteriorate the image formed by the image forming means.

請求項1の発明は、少なくとも2本の回動可能なローラで支持する無端状のベルトと、該ベルトの弦と対向する位置に設けられ、前記ベルトによって搬送される用紙に画像を形成する記録ヘッドと、前記ベルトを介して前記記録ヘッドと対峙する位置に設けられ、前記ベルトの弦を前記記録ヘッド側に張り出すように前記ベルトを押圧するガイド板を有するベルト搬送装置において、前記ガイド板は、前記ベルトの弦の張り出し量を調整するため、前記ベルトの弦に対する位置を調整可能であることを特徴とする。   According to the first aspect of the present invention, there is provided an endless belt supported by at least two rotatable rollers, and a recording which is provided at a position facing the string of the belt and forms an image on a sheet conveyed by the belt. In the belt conveying apparatus having a head and a guide plate that is provided at a position facing the recording head via the belt and presses the belt so as to project a string of the belt toward the recording head, the guide plate Is characterized in that the position of the belt with respect to the string can be adjusted in order to adjust the protruding amount of the string of the belt.

請求項2の発明は、請求項1記載のベルト搬送装置において、前記ガイド板は、該ガイド板と前記ベルトとが接触しない位置まで調整可能であることを特徴とする。   According to a second aspect of the present invention, in the belt conveying device according to the first aspect, the guide plate can be adjusted to a position where the guide plate and the belt do not contact each other.

請求項3の発明は、請求項1または2記載のベルト搬送装置において、前記ガイド板の位置を調整する手段は、前記ガイド板が前記ベルトと接触しない位置までの位置を2段階以上に設定可能であることを特徴とする。   According to a third aspect of the present invention, in the belt conveying apparatus according to the first or second aspect, the means for adjusting the position of the guide plate can set the position until the position where the guide plate does not contact the belt in two or more stages. It is characterized by being.

請求項4の発明は、請求項1乃至3いずれかに記載のベルト搬送装置を用いた画像形成装置であることを特徴とする。   A fourth aspect of the present invention is an image forming apparatus using the belt conveyance device according to any one of the first to third aspects.

請求項1の発明は、無端状のベルトと、ベルトによって搬送される用紙に画像を形成する記録ヘッドと、記録ヘッド側にベルトの弦を張り出すようにベルトを支持するガイド板を有するベルト搬送装置において、ガイド板は、ベルトの弦の張り出し量を調整するため、ベルトの弦に対する位置を調整可能であるので、搬送ベルトを画像形成手段側に張り出させているガイド板の張り出し量を調整することにより、画像形成手段と用紙が接触しないギャップを確保し、形成する画像の劣化を防止することが可能となる。   According to a first aspect of the present invention, there is provided a belt transporter having an endless belt, a recording head for forming an image on a sheet transported by the belt, and a guide plate for supporting the belt so that a string of the belt projects toward the recording head side. In the machine, the guide plate adjusts the amount of overhang of the belt string, so the position of the belt relative to the string can be adjusted, so the amount of overhang of the guide plate that projects the conveyor belt to the image forming means side is adjusted. By doing so, it is possible to secure a gap in which the image forming unit and the paper do not contact each other, and to prevent deterioration of an image to be formed.

請求項2の発明は、請求項1記載のベルト搬送装置において、ガイド板はベルトと接触しない位置まで調整可能であるので、ガイド板を動作させて画像形成手段とのギャップを確保する際に、ガイド板の構成精度が用紙の搬送及び画像形成に影響しない位置まで逃げることが可能となり、また、ガイド板を動作する機構を単純な構成で、低コストで提供することが可能となる。   Since the guide plate can be adjusted to a position where it does not come into contact with the belt, when the guide plate is operated to ensure a gap with the image forming means, It is possible to escape to a position where the construction accuracy of the guide plate does not affect the sheet conveyance and image formation, and it is possible to provide a mechanism for operating the guide plate with a simple configuration at low cost.

請求項3の発明は、請求項1または2記載のベルト搬送装置において、ガイド板の位置を調整する手段は、ガイド板がベルトと接触しない位置まで2段階以上に調整可能であるので、用紙の種類や状態に応じた最適のギャップを確保し、高画質な画像を形成することが可能となる。   The invention of claim 3 is the belt conveying apparatus according to claim 1 or 2, wherein the means for adjusting the position of the guide plate can be adjusted in two or more stages until the position where the guide plate does not contact the belt. It is possible to secure an optimum gap according to the type and state and to form a high-quality image.

請求項4の発明は、請求項1乃至3いずれかに記載のベルト搬送装置を用いた画像形成装置であるので、画像形成手段と用紙が接触しないギャップを確保し、形成する画像の劣化を防止することが可能な画像形成装置を提供することが可能となる。   Since the invention according to claim 4 is an image forming apparatus using the belt conveying device according to any one of claims 1 to 3, a gap in which the image forming unit and the sheet do not contact is secured, and deterioration of an image to be formed is prevented. It is possible to provide an image forming apparatus capable of doing so.

搬送ベルトによって用紙を搬送する記録装置においては、ベルトの平面性を確保した領域で記録媒体である用紙に画像を形成するが、その画質を良好なものとするために、ベルトと記録ヘッドとのギャップは狭く、かつ高精度に保持する必要がある。本発明は、搬送ベルトを画像形成手段側に張り出させているガイド板の張り出し量を調整することにより、画像形成手段と用紙が接触しないギャップを確保し、形成する画像の劣化を防止することを目的とするもので、少なくとも2本の回動可能なローラで支持する無端状のベルトと、該ベルトの弦と対向する位置に設けられ、前記ベルトによって搬送される用紙に画像を形成する記録ヘッドと、前記ベルトを介して前記記録ヘッドと対峙する位置に設けられ、前記ベルトの弦を前記記録ヘッド側に張り出すように前記ベルトを押圧するガイド板を有するベルト搬送装置において、前記ガイド板は、前記ベルトの弦の張り出し量を調整するため、前記ベルトの弦に対する位置を調整可能であることを特徴としている。
以下、本発明のベルト搬送装置及び画像形成装置について、図1〜3に示す実施例に基づいて説明する。
In a recording apparatus that transports paper by a transport belt, an image is formed on a paper that is a recording medium in an area where the flatness of the belt is ensured. In order to improve the image quality, the belt and the recording head The gap must be kept narrow and highly accurate. The present invention secures a gap in which the image forming unit and the sheet do not come into contact with each other and prevents deterioration of an image to be formed by adjusting the amount of the guide plate that projects the conveying belt toward the image forming unit. And an endless belt that is supported by at least two rotatable rollers, and a recording that is provided at a position facing the chord of the belt and forms an image on a sheet conveyed by the belt. In the belt conveying apparatus having a head and a guide plate that is provided at a position facing the recording head via the belt and presses the belt so as to project a string of the belt toward the recording head, the guide plate Is characterized in that the position of the belt relative to the strings can be adjusted in order to adjust the amount of string projection of the belt.
Hereinafter, the belt conveyance device and the image forming apparatus of the present invention will be described based on the embodiments shown in FIGS.

図1は、本発明の実施例1のベルト搬送装置を示す断面図で、図1(A)は、ベルトが大きく張り出した時の状態を示し、図1(B)は、ベルトが小さく張り出した時の状態を示す。
図1に示すベルト搬送装置は、静電搬送方式のインクジェット記録装置の主要部を構成するが、インクジェット記録方式の画像形成装置は、この主要部に、記録ヘッド、インク供給系、給紙系、排紙系等が付加される。
実施例1のベルト搬送装置は、搬送ローラ1、テンションローラ2、無端状の搬送ベルト3、帯電ローラ4、画像形成手段である記録ヘッド5、ガイド板6及びガイド板調整部材7等から構成されている。搬送ベルト3は、無端(シームレス)状またはつなぎ(シーム有り)状で構成され、搬送ローラ1とテンションローラ2によってほぼ水平方向に張架されて支持されており、図示しない駆動装置によって時計方向に駆動され、搬送ベルト3を循環させる。搬送ベルト3の表面は絶縁層によって形成されており、帯電ローラ4から電荷をうけると、静電吸着力を発生し、用紙Sを吸着させて搬送させる。
FIG. 1 is a cross-sectional view showing a belt conveyance device according to a first embodiment of the present invention. FIG. 1 (A) shows a state where the belt is largely extended, and FIG. 1 (B) is a case where the belt is slightly extended. Indicates the state of the hour.
The belt conveyance device shown in FIG. 1 constitutes the main part of an electrostatic conveyance type ink jet recording apparatus. The ink jet recording type image forming apparatus includes a recording head, an ink supply system, a paper feed system, A paper discharge system or the like is added.
The belt conveying apparatus according to the first embodiment includes a conveying roller 1, a tension roller 2, an endless conveying belt 3, a charging roller 4, a recording head 5 as an image forming unit, a guide plate 6, a guide plate adjusting member 7, and the like. ing. The conveyor belt 3 is formed in an endless (seamless) shape or a connected (seamed) shape, and is supported by being stretched in a substantially horizontal direction by the conveyance roller 1 and the tension roller 2, and is clockwise by a driving device (not shown). Driven to circulate the conveyor belt 3. The surface of the conveyor belt 3 is formed of an insulating layer. When an electric charge is received from the charging roller 4, an electrostatic adsorption force is generated, and the sheet S is adsorbed and conveyed.

記録ヘッド5は、搬送ベルト3の水平方向に張架された弦の範囲において対向する位置に平行に配置させて、ガイド板6により搬送ベルト3を内側から記録ヘッド5に向かって張り出させて、平滑な普通紙等の用紙Sに高品質の画像を形成するのに適した狭いギャップGになるように、高精度に位置決めされた状態で、設置されている。また、ガイド板6の搬送ベルト3を張り出させている面は、少なくとも用紙Sに画像を形成する範囲において高精度な平面性を保つように形成されている。さらに、ガイド板6は、図示しない構造体に規制されて上下方向、つまり搬送ベルト3の張り出し量を変更する方向にのみ摺動可能となっている。   The recording head 5 is arranged in parallel to the opposed position in the range of the string stretched in the horizontal direction of the conveying belt 3, and the conveying belt 3 is projected from the inside toward the recording head 5 by the guide plate 6. It is installed in a state of being positioned with high accuracy so as to form a narrow gap G suitable for forming a high-quality image on a sheet S such as smooth plain paper. In addition, the surface of the guide plate 6 on which the conveying belt 3 is extended is formed so as to maintain high-precision flatness at least in the range where an image is formed on the paper S. Further, the guide plate 6 is regulated by a structure not shown in the figure and can slide only in the vertical direction, that is, the direction in which the amount of overhang of the conveyor belt 3 is changed.

ガイド板6の底面には、台形状の突起6a,6aが少なくとも2つ以上形成されており、この台形状の突起6a,6aに対向して、同じく台形状の突起7a,7aをガイド板6の突起6a,6aと同数有するガイド板調整部材7が台形の斜面が向き合うように設置されている。ガイド板6の最も底となる面は、ガイド板調整部材7のガイド板6に対向している2つの高さの面と接触し、ガイド板調整部材7はガイド板6を押し上げて、ガイド板6の高さを決めている。突起6aの高さをH6、突起7aの高さをH7とすると、ガイド板6の底面ともう一つの面の高さH6は、ガイド板調整部材7のいずれの面とも接触しないようにH6>H7の関係を有している。   At least two trapezoidal protrusions 6a and 6a are formed on the bottom surface of the guide plate 6, and the trapezoidal protrusions 7a and 7a are similarly opposed to the trapezoidal protrusions 6a and 6a. The guide plate adjusting members 7 having the same number as the projections 6a, 6a are installed so that the trapezoidal slopes face each other. The bottom surface of the guide plate 6 is in contact with the two height surfaces facing the guide plate 6 of the guide plate adjusting member 7, and the guide plate adjusting member 7 pushes up the guide plate 6 to guide the guide plate 6. The height of 6 is decided. If the height of the protrusion 6a is H6 and the height of the protrusion 7a is H7, the height H6 of the bottom surface of the guide plate 6 and the other surface is H6> so that it does not contact any surface of the guide plate adjusting member 7. It has a relationship of H7.

ガイド板調整部材7は、図示しない構造部材によって、高さ方向を位置決めされ、図に向かって左右方向にスライドするように設置されている。さらに、ガイド板6はガイド板調整部材7によって高さ方向を位置決めされることから、ガイド板調整部材7においても高精度に位置決めされ、移動可能に支持されている。   The guide plate adjusting member 7 is positioned so as to be positioned in the height direction by a structural member (not shown) and to slide in the left-right direction as viewed in the drawing. Further, since the guide plate 6 is positioned in the height direction by the guide plate adjusting member 7, it is also positioned with high accuracy in the guide plate adjusting member 7 and supported so as to be movable.

実施例1のベルト搬送装置の動作について説明する。
ガイド板調整部材7を図1(A)に示す矢印Xのように右方向にスライドさせた場合、ガイド板6の台形状の突起6aの斜面はガイド板調整部材7の台形状の突起7aの斜面を滑り上がり、ガイド板6が押しあげられ、小さなギャップGSの位置となる。この状態のとき、封筒、癖のついた用紙や厚手の用紙を搬送させた場合、用紙Sは記録ヘッド5に接触し、記録ヘッドによって形成される画像が劣化する。ガイド板調整部材7を図1(B)に示す矢印Yのように左方向にスライドさせると、ガイド板6の台形状の突起6aの斜面はガイド板調整部材7の台形状の突起7aの斜面を滑り下がり、大きなギャップGLとなり、ギャップGSよりも広くなる。したがって、GL−GS=(突起7aの高さH7)の関係がある。このとき、要求される封筒や癖のついた用紙や厚手の用紙を搬送させても、用紙Sが記録ヘッド5に接触しないように、突起7aの高さをH7の値を適宜設定する。
The operation of the belt conveyance device according to the first embodiment will be described.
When the guide plate adjusting member 7 is slid rightward as indicated by an arrow X shown in FIG. 1A, the slope of the trapezoidal protrusion 6a of the guide plate 6 is the slope of the trapezoidal protrusion 7a of the guide plate adjusting member 7. slide up the slope, the guide plate 6 is raised press, the position of the small gap G S. In this state, when an envelope, a sheet with a fold or a thick sheet is conveyed, the sheet S comes into contact with the recording head 5 and the image formed by the recording head deteriorates. When the guide plate adjusting member 7 is slid leftward as indicated by an arrow Y shown in FIG. 1B, the slope of the trapezoidal protrusion 6a of the guide plate 6 is the slope of the trapezoidal protrusion 7a of the guide plate adjusting member 7. down slip, next large gap G L, is wider than the gap G S. Therefore, there is a relationship of G L −G S = (height H7 of the protrusion 7a). At this time, the height of the protrusion 7a is appropriately set so that the sheet S does not come into contact with the recording head 5 even if a required envelope, a sheet with a fold or a thick sheet is conveyed.

図2は、本発明の実施例2のベルト搬送装置を示す断面図で、図2(A)は、ベルトが小さく張り出した時の状態を示し、図2(B)は、ベルトが大きく張り出した時の状態を示す。
実施例2のベルト搬送装置は、図1に示す実施例1のベルト搬送装置と同様に、搬送ローラ1とテンションローラ2間に張架支持された搬送ベルト3の水平な弦に対向して記録ヘッド5が配置され、搬送ベルト3を介して記録ヘッド5に対峙する位置にガイド板6を配置し、ガイド板6を搬送ベルト3の内側から外側に向かって位置調整可能に設けた構成となっている。
FIG. 2 is a cross-sectional view showing a belt conveyance device according to a second embodiment of the present invention. FIG. 2 (A) shows a state where the belt is slightly extended, and FIG. 2 (B) is a case where the belt is greatly extended. Indicates the state of the hour.
Similar to the belt conveyance device of the first embodiment shown in FIG. 1, the belt conveyance device of the second embodiment performs recording while facing the horizontal string of the conveyance belt 3 stretched and supported between the conveyance roller 1 and the tension roller 2. The head 5 is disposed, a guide plate 6 is disposed at a position facing the recording head 5 through the conveyance belt 3, and the guide plate 6 is provided so that the position of the guide plate 6 can be adjusted from the inside to the outside of the conveyance belt 3. ing.

ガイド板6の底面には中空方形の角筒6b,6bが少なくとも2個以上形成され、中空方形の角筒6b,6bには、それぞれその内側にガイド板6を押し上げるのに十分な反発力を有するコイルスプリング8,8が収容されており、角筒6b,6bとともにコイルスプリング8,8を覆うキャップ9,9を挟んで、ガイド板調整部材7がガイド板6を支持している。キャップ9,9の内側底面はガイド板調整部材7がガイド板6を最大に押し上げた状態(図2(A))となっても、角筒6b,6bの底面と干渉することはなく、常にコイルスプリング8,8の反発力をガイド板6に伝えられる構成としている。   At least two hollow square tubes 6b, 6b are formed on the bottom surface of the guide plate 6, and the hollow square tubes 6b, 6b each have a repulsive force sufficient to push up the guide plate 6 inside thereof. The coil springs 8 and 8 are accommodated, and the guide plate adjusting member 7 supports the guide plate 6 with the caps 9 and 9 covering the coil springs 8 and 8 together with the square tubes 6b and 6b. The inner bottom surfaces of the caps 9 and 9 do not interfere with the bottom surfaces of the square tubes 6b and 6b even when the guide plate adjusting member 7 is in a state where the guide plate 6 is pushed up to the maximum (FIG. 2A). The repulsive force of the coil springs 8 and 8 is transmitted to the guide plate 6.

また、キャップ9,9の外側底面の垂直断面は台形状に形成されており、その斜面はガイド板調整部材7に形成された台形状の突起7a,7aの斜面と向き合うように取り付けられている。ガイド板6には、図2に示すような側片6c、6cが形成されており、ガイド板6がガイド板調整部材7により押し上げられているときは、側片6c、6cの上面が画像形成装置本体の構造体の一部である当接部材10,10の下面に押し当てられて位置決めされている。   Further, the vertical cross section of the outer bottom surface of the caps 9 and 9 is formed in a trapezoidal shape, and the inclined surface thereof is attached so as to face the inclined surfaces of the trapezoidal protrusions 7a and 7a formed on the guide plate adjusting member 7. . Side pieces 6c and 6c as shown in FIG. 2 are formed on the guide plate 6. When the guide plate 6 is pushed up by the guide plate adjusting member 7, the upper surfaces of the side pieces 6c and 6c are image-formed. It is positioned by being pressed against the lower surfaces of the contact members 10 and 10 which are a part of the structure of the apparatus main body.

コイルスプリング8,8を使用することで、側片6c、6cが常に当接部材10,10に押し当った状態を維持することができ、ガイド板調整部材7の高さを高精度に加工して形成する必要をなくし、コストダウンを図ることを可能としている。この場合、当接部材10,10は、ギャップGが適正な距離になるように、高精度に位置決めされて固定される。また、ガイド板6は、最も押し下げられた状態(図2(B))になったとき、コイルスプリング8,8は伸長状態となるが、ガイド板6の上面が搬送ベルト3と接触しなくなる位置まで移動するように構成されている。   By using the coil springs 8 and 8, the side pieces 6 c and 6 c can always be kept pressed against the contact members 10 and 10, and the height of the guide plate adjustment member 7 is processed with high accuracy. Therefore, it is possible to reduce the cost. In this case, the contact members 10 and 10 are positioned and fixed with high accuracy so that the gap G becomes an appropriate distance. Further, when the guide plate 6 is in the most depressed state (FIG. 2B), the coil springs 8 and 8 are in the extended state, but the upper surface of the guide plate 6 is not in contact with the conveying belt 3. Is configured to move up to.

実施例2のベルト搬送装置の動作について説明する。
ガイド板調整部材7を図2(A)の矢印Xのようにスライドさせた場合、キャップ9,9の外側底部の斜面がガイド板調整部材7の台形状の突起7a,7aの斜面を滑りあがりコイルスプリング8を圧縮する。コイルスプリング8は、ガイド板6の側片6c,6cが当接部材10,10に押し当たるまで押し上げ、ガイド板6は小さなギャップGSが形成される位置に移動する。このとき、搬送ベルトによって、封筒や厚手の用紙を搬送させると、これらの用紙は記録ヘッド5に接触するため、図2(B)の矢印Yのようにガイド板調整部材7をスライドさせる。キャップ9,9の底部斜面はガイド板調整部材7の台形状の突起7a,7aの斜面を滑り降り、ガイド板6は搬送ベルト3のテンションにより押し下げられる。ガイド板6が搬送ベルト3に接触しなくなる位置まで移動すると、大きなギャップGLの位置になり、封筒や厚手の用紙がヘッド5に接触するのを防止しつつ搬送させることができる。
The operation of the belt conveyance device according to the second embodiment will be described.
When the guide plate adjusting member 7 is slid as shown by an arrow X in FIG. 2A, the slopes of the outer bottom portions of the caps 9 and 9 slide up the slopes of the trapezoidal protrusions 7a and 7a of the guide plate adjusting member 7. The coil spring 8 is compressed. The coil spring 8 is pushed to the side piece 6c of the guide plate 6, 6c is pressed against the abutment members 10, the guide plate 6 is moved to a position where a small gap G S is formed. At this time, when the envelope or the thick paper is conveyed by the conveyance belt, these sheets come into contact with the recording head 5, and therefore the guide plate adjusting member 7 is slid as indicated by an arrow Y in FIG. The bottom slopes of the caps 9 and 9 slide down the slopes of the trapezoidal protrusions 7 a and 7 a of the guide plate adjusting member 7, and the guide plate 6 is pushed down by the tension of the conveyor belt 3. When the guide plate 6 moves to a position where it does not come into contact with the transport belt 3, the position becomes a large gap GL , and it can be transported while preventing the envelope or thick paper from contacting the head 5.

図3は、本発明の実施例3のベルト搬送装置を示す断面図で、図3(A)は、ベルトが大きく張り出した時の状態を示し、図3(B)は、ベルトが小さく張り出した時の状態を示し、図3(C)は、ベルトが張り出していない時の状態を示す。
実施例3のベルト搬送装置は、実施例2のベルト搬送装置に対する構成の中でガイド板調整部材7の形状に変更を加えたもので、図3に示すように、複数の台形状の突起7a,7aのすべての斜面の同じ高さの中腹に小型の台形状の突起7b,7bを形成し、大きなギャップGLと小さなギャップGSとの間に中間長さのギャップGMを形成する構成としている。
FIG. 3 is a cross-sectional view showing a belt conveyance device according to a third embodiment of the present invention. FIG. 3 (A) shows a state when the belt is largely extended, and FIG. 3 (B) is a case where the belt is slightly extended. FIG. 3C shows a state when the belt is not overhanging.
The belt conveying device of the third embodiment is obtained by changing the shape of the guide plate adjusting member 7 in the configuration of the belt conveying device of the second embodiment. As shown in FIG. 3, a plurality of trapezoidal protrusions 7a. , configured to form a gap G M of the intermediate length between all small in the middle of the same height of the slope trapezoidal projections 7b of 7a, 7b is formed, a large gap G L and a small gap G S It is said.

実施例3のベルト搬送装置の動作について説明する。
第1に、ガイド板調整部材7が図3(A)に示す位置にあるときは、ガイド板6が最大量押し上げられ、側片6c,6cの上面が当接部材10,10の底面に押し当てられ、記録ヘッド5と搬送ベルト表面間のギャップは、最小ギャップGSが形成される。
第2に、ガイド板調整部材7が図3(B)に示す位置にあるときは、側片6c,6cが当接部材10,10に当接せず、ガイド板調整部材7の突起7b,7bがキャップ9,9と当接し、ガイド板6が搬送ベルト3と接触しなくなるまでの範囲の中程度のギャップGMが形成される。
第3に、ガイド板調整部材7が図3(C)に示す位置にあるときは、ガイド板6が搬送ベルト3に接触しない位置まで下がり、最大ギャップGLが形成される。
これらの各段階の位置を用紙の特性や状態によって選択し、記録ヘッド5に用紙Sを接触させない範囲で高画質を得ることができる。
The operation of the belt conveyance device according to the third embodiment will be described.
First, when the guide plate adjusting member 7 is in the position shown in FIG. 3A, the guide plate 6 is pushed up by the maximum amount, and the upper surfaces of the side pieces 6c, 6c are pushed against the bottom surfaces of the contact members 10, 10. devoted the gap between the conveyor belt surface and the recording head 5, the minimum gap G S is formed.
Second, when the guide plate adjusting member 7 is in the position shown in FIG. 3B, the side pieces 6c, 6c do not contact the contact members 10, 10, and the protrusions 7b of the guide plate adjusting member 7 7b abuts the cap 9,9, gap G M moderate ranging guide plate 6 is no longer in contact with the conveyor belt 3 is formed.
Third, when the guide plate adjusting member 7 is in the position shown in FIG. 3C, the guide plate 6 is lowered to a position where it does not contact the conveyor belt 3, and the maximum gap GL is formed.
The position of each of these steps can be selected according to the characteristics and state of the paper, and high image quality can be obtained within a range where the paper S does not contact the recording head 5.

実施例1のベルト搬送装置を示す断面図で、図1(A)はベルトが小さく張り出した時の状態を示し、図1(B)はベルトが大きく張り出した時の状態を示す。FIGS. 1A and 1B are cross-sectional views illustrating the belt conveyance device according to the first exemplary embodiment. FIG. 1A illustrates a state when the belt projects slightly, and FIG. 1B illustrates a state when the belt projects largely. 実施例2のベルト搬送装置を示す断面図で、図2(A)は、ベルトが小さく張り出した時の状態を示し、図2(B)は、ベルトが大きく張り出した時の状態を示す。FIG. 2A is a cross-sectional view illustrating the belt conveyance device of the second embodiment, and FIG. 2A illustrates a state when the belt projects slightly, and FIG. 2B illustrates a state when the belt projects largely. 実施例3のベルト搬送装置を示す断面図で、図3(A)は、ベルトが大きく張り出した時の状態を示し、図3(B)は、ベルトが小さく張り出した時の状態を示す、図3(C)は、ベルトが中程度張り出していない時の状態を示す。FIG. 3A is a cross-sectional view illustrating a belt conveyance device according to a third embodiment. FIG. 3A illustrates a state when the belt is largely extended, and FIG. 3B illustrates a state when the belt is small. 3 (C) shows a state when the belt is not moderately overhanging.

符号の説明Explanation of symbols

1…搬送ローラ、2…テンションローラ、3…搬送ベルト、4…帯電ローラ、5…記録ヘッド、6…ガイド板、6a…台形状の突起、6b…角筒、7…ガイド板調整部材、7a,7b…台形状の突起、8…コイルスプリング、9…キャップ、10…当接部材、G…ギャップ、S…用紙。 DESCRIPTION OF SYMBOLS 1 ... Conveyance roller, 2 ... Tension roller, 3 ... Conveyor belt, 4 ... Charging roller, 5 ... Recording head, 6 ... Guide plate, 6a ... Trapezoidal protrusion, 6b ... Square tube, 7 ... Guide plate adjustment member, 7a , 7b: trapezoidal protrusion, 8: coil spring, 9 ... cap, 10 ... contact member, G ... gap, S ... paper.

Claims (4)

少なくとも2本の回動可能なローラで支持する無端状のベルトと、該ベルトの弦と対向する位置に設けられ、前記ベルトによって搬送される用紙に画像を形成する記録ヘッドと、前記ベルトを介して前記記録ヘッドと対峙する位置に設けられ、前記ベルトの弦を前記記録ヘッド側に張り出すように前記ベルトを押圧するガイド板を有するベルト搬送装置において、前記ガイド板は、前記ベルトの弦の張り出し量を調整するため、前記ベルトの弦に対する位置を調整可能であることを特徴とするベルト搬送装置。   An endless belt supported by at least two rotatable rollers, a recording head provided at a position facing the chord of the belt and forming an image on a sheet conveyed by the belt, and via the belt A guide plate that is provided at a position facing the recording head and presses the belt so that the string of the belt projects toward the recording head. In order to adjust the amount of overhang, the position of the belt relative to the string can be adjusted. 請求項1記載のベルト搬送装置において、前記ガイド板は、前記ベルトと接触しない位置まで調整可能であることを特徴とするベルト搬送装置。   The belt conveyance device according to claim 1, wherein the guide plate is adjustable to a position where the guide plate does not contact the belt. 請求項1または2記載のベルト搬送装置において、前記ガイド板の位置を調整する手段は、前記ガイド板が前記ベルトと接触しない位置まで2段階以上に設定可能であることを特徴とするベルト搬送装置。   3. The belt conveying apparatus according to claim 1, wherein the means for adjusting the position of the guide plate can be set in two or more stages until the position where the guide plate does not contact the belt. . 請求項1乃至3いずれかに記載のベルト搬送装置を用いたことを特徴とする画像形成装置。   An image forming apparatus using the belt conveying device according to claim 1.
JP2004218668A 2004-07-27 2004-07-27 Belt conveying device and image forming apparatus using the belt conveying device Expired - Fee Related JP4265787B2 (en)

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JP2008183861A (en) * 2007-01-31 2008-08-14 Kyocera Mita Corp Image forming device and positioning member for its conveying unit
JP2010042628A (en) * 2008-08-15 2010-02-25 Olympus Corp Inkjet recording device
JP2011051165A (en) * 2009-08-31 2011-03-17 Brother Industries Ltd Recording apparatus
KR20180093892A (en) 2015-12-17 2018-08-22 니폰 제온 가부시키가이샤 Liquid crystal display
CN108944035A (en) * 2018-05-07 2018-12-07 浙江普崎数码科技有限公司 A kind of ink jet type digital-code printer of adjustable distance

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JP2008019021A (en) * 2006-07-11 2008-01-31 Fujifilm Corp Inkjet recording device
JP4610528B2 (en) * 2006-07-11 2011-01-12 富士フイルム株式会社 Inkjet recording device
JP2008183861A (en) * 2007-01-31 2008-08-14 Kyocera Mita Corp Image forming device and positioning member for its conveying unit
JP2010042628A (en) * 2008-08-15 2010-02-25 Olympus Corp Inkjet recording device
JP2011051165A (en) * 2009-08-31 2011-03-17 Brother Industries Ltd Recording apparatus
US8287120B2 (en) 2009-08-31 2012-10-16 Brother Kogyo Kabushiki Kaisha Recording apparatus
KR20180093892A (en) 2015-12-17 2018-08-22 니폰 제온 가부시키가이샤 Liquid crystal display
CN108944035A (en) * 2018-05-07 2018-12-07 浙江普崎数码科技有限公司 A kind of ink jet type digital-code printer of adjustable distance

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