JP2005089008A - Paper delivery mechanism, paper feeding device, and image formation device - Google Patents

Paper delivery mechanism, paper feeding device, and image formation device Download PDF

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JP2005089008A
JP2005089008A JP2003320458A JP2003320458A JP2005089008A JP 2005089008 A JP2005089008 A JP 2005089008A JP 2003320458 A JP2003320458 A JP 2003320458A JP 2003320458 A JP2003320458 A JP 2003320458A JP 2005089008 A JP2005089008 A JP 2005089008A
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paper
guide member
sheet
conveying
feeding device
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Yoshihiro Aono
芳大 青野
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Ricoh Co Ltd
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Ricoh Co Ltd
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  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Registering Or Overturning Sheets (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper delivery mechanism in a paper feeding device of an image formation device with a simple structure for reducing flip sounds and delivery resistance of the paper and a reverse rotation guide plate. <P>SOLUTION: This paper delivery mechanism in a paper feeding device of an image formation device delivers papers P fed from a first delivery means 2a to a second delivery means 3 on a downstream side positioned in its approximately vertical upper direction. A reverse rotation guide member 4 is installed between the first delivery means 2a and the second delivery means 3, and the reverse rotation guide member 4 can move toward the second delivery means 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、複写機、ファクシミリ、プリンタ等の画像形成装置の給紙装置における用紙搬送機構、これを使用する給紙装置およびこの給紙装置を備えた画像形成装置に関するものである。   The present invention relates to a paper transport mechanism in a paper feeding device of an image forming apparatus such as a copying machine, a facsimile machine, and a printer, a paper feeding device using the same, and an image forming apparatus including the paper feeding device.

近年、プリンタ、ファクシミリ、複写機等の画像形成装置に対しては小型化が要求されているとともに、種々の厚さの紙を使用できることが要求されており、この要求に対しては種々の対応が従来からなされている（例えば、特許文献１ないし４参照）。
給紙トレイ内に積載された用紙を、例えば画像形成部等の所望の位置に供給する場合、シートを方向変換せずに搬送すると、用紙搬送路が占める面積が水平方向に拡がり装置が大型化する。そこで、給紙直後の用紙をシートガイドの円弧状の案内面により湾曲させて搬送方向を変更するようにした装置が多い。
図８は従来の給紙装置の１例を示す概略図である。給紙トレイ１からほぼ垂直上方向に位置する搬送ローラ３に用紙Ｐを送り出す従来の給紙装置においては、給紙トレイ１内に積載された用紙ＰはＦＲＲ分離方式の給紙コロ２ａ、分離コロ２ｂ、及び呼び出しコロ２ｃによって分離される。
その際、用紙Ｐの先端は反転ガイド板４に沿って搬送され、この反転ガイド板４出口に位置する弾性変形可能な案内片５に沿って、搬送ローラ対３に到達する。
用紙Ｐの送り出し位置である給紙コロ２ａと分離コロ２ｂとのニップ部分は、反転ガイド板４の端部４ａよりも上側に位置するため、用紙Ｐの搬送が進むと、用紙Ｐの後端が反転ガイド板４の傾斜縁に接触し、紙の弾けるような異音を発生してしまう。
この現象は、とくに厚紙の場合に顕著なものであった。この異音を解消するための装置として、反転ガイド板に植毛テープを貼り付け異音を吸収した技術（特許文献１参照）や、給紙コロの回転に連動するカム機構を設けたガイド板の技術（特許文献２参照）、ガイド板手前にマイラ等の補助ガイド板を設けた技術（特許文献３および４参照）などが挙げられる。
特開２００２−２４０９７８公報 実公平５−２５０８号公報 実開平６−８３６４５号公報 特開平８−２２５１８６号公報 In recent years, image forming apparatuses such as printers, facsimiles, copiers and the like have been required to be downsized and papers having various thicknesses can be used. Has been made conventionally (see, for example, Patent Documents 1 to 4).
For example, when the paper stacked in the paper feed tray is supplied to a desired position such as an image forming unit, if the sheet is transported without changing its direction, the area occupied by the paper transport path is expanded in the horizontal direction and the apparatus is enlarged. To do. Therefore, there are many apparatuses in which the sheet immediately after being fed is bent by the arcuate guide surface of the sheet guide to change the conveyance direction.
FIG. 8 is a schematic view showing an example of a conventional paper feeder. In the conventional paper feeding apparatus that feeds the paper P from the paper feeding tray 1 to the conveying roller 3 positioned substantially vertically upward, the paper P loaded in the paper feeding tray 1 is fed into the FRR separation type paper feeding roller 2a and separated. It is separated by a roller 2b and a calling roller 2c.
At that time, the leading edge of the sheet P is transported along the reverse guide plate 4 and reaches the transport roller pair 3 along the elastically deformable guide piece 5 located at the exit of the reverse guide plate 4.
Since the nip portion between the sheet feeding roller 2a and the separation roller 2b, which is the feeding position of the sheet P, is located above the end 4a of the reversing guide plate 4, when the conveyance of the sheet P proceeds, the rear end of the sheet P Will come into contact with the inclined edge of the reversing guide plate 4 and generate an unusual noise that will cause the paper to flip.
This phenomenon was remarkable especially in the case of cardboard. As a device for eliminating this abnormal noise, a technique (see Patent Document 1) in which a flocking tape is attached to a reversing guide plate to absorb the abnormal noise, or a guide plate provided with a cam mechanism that interlocks with the rotation of a paper feed roller. Examples thereof include a technique (see Patent Document 2), a technique in which an auxiliary guide plate such as Mylar is provided in front of the guide plate (see Patent Documents 3 and 4), and the like.
JP 2002-240978 A No. 5-2508 Japanese Utility Model Publication No. 6-83645 JP-A-8-225186

しかしながら、上記従来技術においては、用紙後端の弾き音の低減に関して大きな効果が期待できるものであるが、その他の問題点も考えられる。反転ガイド板に植毛テープを貼り付けた場合、厚紙を搬送するさい、大きな抵抗となってしまい、垂直上方向の搬送に影響を与えてしまう。
また、ガイド板手前にマイラを設けた場合はマイラの先端位置が出し難いということの他に、強度が低く、耐久性に劣るという問題点がある。さらに、カム機構を設けた場合では部品が多くなり、装置そのものも大型化してしまうという問題点がある。
そこで本発明の目的は、上記の問題点を解決するために、用紙と反転ガイド板の弾き音、および搬送抵抗を低減させ、かつ構造が簡単な画像形成装置の給紙装置における用紙搬送機構、これを使用する給紙装置およびこの給紙装置を備えた画像形成装置を提供することにある。 However, although the above-described prior art can be expected to have a great effect on the reduction of the flipping sound at the trailing edge of the paper, other problems are also conceivable. When a flocking tape is affixed to the reversing guide plate, it becomes a great resistance when transporting cardboard, which affects the transport in the vertical direction.
In addition, when the mylar is provided in front of the guide plate, there is a problem that the tip position of the mylar is difficult to be obtained and the strength is low and the durability is inferior. Further, when the cam mechanism is provided, there are problems that the number of parts increases and the apparatus itself becomes large.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems, by reducing the beating sound of the sheet and the reversing guide plate, and the conveyance resistance, and the sheet conveying mechanism in the sheet feeding device of the image forming apparatus with a simple structure An object of the present invention is to provide a paper feeding device using the same and an image forming apparatus provided with the paper feeding device.

前記の課題を解決するために、請求項１記載の発明では、第１の搬送手段から送り出された用紙をそのほぼ垂直上方向に位置する下流側の第２の搬送手段まで搬送する画像形成装置の給紙装置における用紙搬送機構において、前記第１の搬送手段と第２の搬送手段の間に反転ガイド部材を設け、この反転ガイド部材が前記第２の搬送手段に向って可動である用紙搬送機構を最も主要な特徴とする。
請求項２記載の発明では、前記反転ガイド部材が垂直方向に可動である請求項１記載の用紙搬送機構を主要な特徴とする。
請求項３記載の発明では、前記反転ガイド部材が搬送面に対して垂直の方向に可動である請求項１記載の用紙搬送機構を主要な特徴とする。
請求項４記載の発明では、前記反転ガイド部材の可動部が弾性部材によって支持されている請求項１ないし３のいずれか１項記載の用紙搬送機構を最も主要な特徴とする。
請求項５記載の発明では、前記弾性部材が前記反転ガイド部材の内側に装填される請求項４記載の用紙搬送機構を主要な特徴とする。
請求項６記載の発明では、前記第１の搬送手段として給紙コロ、前記第２の搬送手段として搬送ローラを用いた請求項１記載の用紙搬送機構を備える給紙装置を最も主要な特徴とする。
請求項７記載の発明では、請求項６記載の給紙装置を備えた画像形成装置を最も主要な特徴とする。 In order to solve the above-described problem, according to the first aspect of the present invention, an image forming apparatus that transports a sheet fed from the first transport unit to a second transport unit on the downstream side located substantially vertically upward. In the paper transport mechanism of the paper feeding apparatus, a reverse guide member is provided between the first transport means and the second transport means, and the reverse guide member is movable toward the second transport means. The mechanism is the main feature.
According to a second aspect of the present invention, the paper transport mechanism according to the first aspect is characterized in that the reversing guide member is movable in the vertical direction.
According to a third aspect of the invention, the paper conveying mechanism according to the first aspect is characterized in that the reversing guide member is movable in a direction perpendicular to the conveying surface.
According to a fourth aspect of the invention, the paper transport mechanism according to any one of the first to third aspects is characterized in that the movable portion of the reversing guide member is supported by an elastic member.
The invention according to claim 5 is characterized in that the elastic member is loaded inside the reversing guide member.
According to a sixth aspect of the present invention, the main feature is a paper feeding device having a paper transport mechanism according to the first aspect, wherein a paper feed roller is used as the first transport means and a transport roller is used as the second transport means. To do.
According to the seventh aspect of the invention, the image forming apparatus provided with the paper feeding device according to the sixth aspect is the main feature.

請求項１によれば、反転ガイド部材が可動となっている構造であるため、第１の搬送手段から送り出されたシートをそのほぼ垂直上方向に位置する下流側の第２の搬送手段まで搬送するさい、用紙後端が反転ガイド部材に接触するときのショックを吸収し、弾き音を低減させることができる。
請求項２によれば、反転ガイド部材が可動となっている構造であるため、用紙後端が反転ガイド部材に接触するときのショックを吸収し、弾き音を低減させることができる。
請求項３によれば、反転ガイド部材が可動となっている構造であるため、第１の搬送手段から送り出されたシートをそのほぼ垂直上方向に位置する下流側の第２の搬送手段まで搬送するさい、用紙後端が反転ガイド部材に接触するときのショックを吸収し、弾き音を低減させることができる。
請求項４によれば、用紙先端が反転ガイド部材に接触するさい、反転ガイド部材に装着された弾性部材が垂直上方の搬送力を発生させ、搬送するさいのシートのスリップによって生ずる搬送タイミングのずれ、紙詰まり、斜行等の搬送不良を防止することができる。
また、用紙後端が反転ガイド板を弾くさいは弾性部材の力によってショックを吸収し、弾き音の低減を行うことができ、通紙後は反転ガイド部材が確実に原点に復帰することができる。
請求項５によれば、用紙先端が反転ガイド部材に接触するさい、反転ガイド部材に装着された弾性部材が垂直上方の搬送力を発生させ、搬送するさいのシートのスリップによって生ずる搬送タイミングのずれ、紙詰まり、斜行等の搬送不良を防止することができる。
また、後端がガイド板を弾くさいは弾性部材の力によってショックを吸収し、弾き音の低減を行うことができ、通紙後はガイド部材が確実に原点に復帰することができる。
請求項６によれば、第１の搬送手段から送り出されたシートをそのほぼ垂直上方向に位置する下流側の第２の搬送手段まで搬送するさい、用紙後端の弾き音を低減させることができる。
また、用紙の搬送力を発生させ、搬送するさいのシートのスリップによって生ずる搬送タイミングのずれ、紙詰まり、斜行等の搬送不良を防止することができ、さらに装置全体のサイズを大きくすることのない給紙装置を提供することができる。
請求項７によれば、第１の搬送手段から送り出されたシートをそのほぼ垂直上方向に位置する下流側の第２の搬送手段まで搬送するさい、用紙後端の弾き音を低減させることができる。
また、用紙の搬送力を発生させ、搬送するさいのシートのスリップによって生ずる搬送タイミングのずれ、紙詰まり、斜行等の搬送不良を防止することができ、さらに装置全体のサイズを大きくすることのない給紙装置を有する画像形成装置を提供することができる。 According to the first aspect of the present invention, since the reversing guide member is movable, the sheet fed from the first conveying means is conveyed to the second conveying means on the downstream side located substantially vertically upward. On the other hand, it is possible to absorb a shock when the rear end of the sheet comes into contact with the reverse guide member, and to reduce the playing sound.
According to the second aspect of the present invention, since the reversing guide member is movable, it is possible to absorb a shock when the rear end of the sheet comes into contact with the reversing guide member and to reduce the playing sound.
According to the third aspect of the present invention, since the reversing guide member is movable, the sheet fed from the first conveying means is conveyed to the second conveying means on the downstream side located substantially vertically upward. On the other hand, it is possible to absorb a shock when the rear end of the sheet comes into contact with the reverse guide member, and to reduce the playing sound.
According to the fourth aspect, when the leading edge of the sheet comes into contact with the reversing guide member, the elastic member mounted on the reversing guide member generates a vertically upward conveying force, and the deviation of the conveying timing caused by the slip of the conveying sheet. In addition, conveyance failure such as paper jam and skew feeding can be prevented.
Further, when the trailing edge of the sheet flips the reverse guide plate, the shock can be absorbed by the force of the elastic member, and the flipping sound can be reduced, and the reverse guide member can surely return to the origin after passing the paper. .
According to the fifth aspect, when the leading edge of the sheet comes into contact with the reversing guide member, the elastic member mounted on the reversing guide member generates a vertically upward conveying force, and the deviation of the conveying timing caused by the slip of the conveying sheet. In addition, conveyance failure such as paper jam and skew feeding can be prevented.
Further, when the rear end flips the guide plate, the shock can be absorbed by the force of the elastic member to reduce the beeping sound, and the guide member can surely return to the origin after passing the paper.
According to the sixth aspect of the present invention, when the sheet fed from the first conveying means is conveyed to the second conveying means located on the downstream side in the substantially vertical direction, it is possible to reduce the beating sound at the trailing edge of the sheet. it can.
In addition, it can prevent the conveyance failure such as deviation of the conveyance timing, paper jam, skew feeding, etc. caused by the slip of the sheet when conveying the paper, and further increase the size of the entire apparatus. No paper feeding device can be provided.
According to the seventh aspect, when the sheet fed from the first transport unit is transported to the second transport unit on the downstream side which is positioned substantially vertically upward, it is possible to reduce the beeping sound at the trailing edge of the sheet. it can.
In addition, it can prevent the conveyance failure such as the deviation of the conveyance timing, paper jam, skew feeding, etc. caused by the slip of the sheet when conveying the paper, and the size of the entire apparatus can be increased. An image forming apparatus having no paper feeding device can be provided.

以下、図面により本発明の実施の形態を詳細に説明する。図１は本発明による給紙装置の反転ガイド部材の第１の実施の形態を示す断面図である。図２は図１の反転ガイド部材の斜視図である。
給紙装置は、給紙トレイ１からほぼ垂直上方向に位置する搬送ローラ３に用紙Ｐを送り出す。給紙トレイ１内に積載された用紙ＰはＦＲＲ分離方式の給紙コロ２ａ、分離コロ２ｂ、呼び出しコロ２ｃによって分離される。
そのさい、用紙Ｐの先端は反転ガイド部材４に沿って搬送され、この反転ガイド部材４の出口に位置する弾性変形可能な案内片５に沿って、前記搬送ローラ３に到達する。
図１および図２において、反転ガイド部材４は可動部（上）６と固定部（下）７の２個の部品からなる。固定部７は図示しない給紙ユニット本体に支点８を中心に回動可能に取り付けられており、用紙搬送路内での用紙のジャム処理等の動作を容易に行うことができるようにしている。
可動部６には４本のピン６ａ〜６ｄを下向きに突設しており、固定部７には４本の円筒７ａ〜７ｄがあり、この円筒７ａ〜７ｄ中にはコイルばね９が装填されている。４本のピン６ａ〜６ｄと円筒部７ａ〜７ｄで２つの反転ガイド部材部品６、７は合わさるので、可動部６は垂直方向にのみ可動となる。可動部６と固定部７の段差部分には弾性変形可能な案内片１１を貼り付けておくと良い。
また、可動部６が所期位置（原点）に復帰するさいその位置を規制するためのストッパ爪１０が固定部７に取り付けられている。４本のばねの長さは同等とし、ばね定数はマシン推奨の紙厚範囲と反転ガイド部材４との接触抵抗力を予め計算しておき、そこから最適値（垂直上方への戻し力）に設定するのが良い。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a first embodiment of a reverse guide member of a paper feeding device according to the present invention. FIG. 2 is a perspective view of the reverse guide member of FIG.
The sheet feeding device feeds the sheet P from the sheet feeding tray 1 to the conveying roller 3 positioned substantially vertically upward. The paper P loaded in the paper feed tray 1 is separated by the FRR separation type paper feed roller 2a, separation roller 2b, and calling roller 2c.
At that time, the leading edge of the paper P is transported along the reverse guide member 4 and reaches the transport roller 3 along the elastically deformable guide piece 5 located at the exit of the reverse guide member 4.
In FIG. 1 and FIG. 2, the reversing guide member 4 is composed of two parts, a movable part (upper) 6 and a fixed part (lower) 7. The fixing unit 7 is attached to a sheet feeding unit main body (not shown) so as to be rotatable around a fulcrum 8 so that operations such as paper jam processing in the paper conveyance path can be easily performed.
The movable portion 6 has four pins 6a to 6d protruding downward, and the fixed portion 7 has four cylinders 7a to 7d, and a coil spring 9 is loaded in the cylinders 7a to 7d. ing. Since the two reversing guide member parts 6 and 7 are combined by the four pins 6a to 6d and the cylindrical portions 7a to 7d, the movable portion 6 is movable only in the vertical direction. A guide piece 11 that is elastically deformable may be attached to the step portion of the movable portion 6 and the fixed portion 7.
A stopper claw 10 for restricting the position of the movable portion 6 when the movable portion 6 returns to the intended position (origin) is attached to the fixed portion 7. The lengths of the four springs are the same, and the spring constant is calculated in advance from the recommended paper thickness range of the machine and the contact resistance force between the reversing guide member 4 and from there to the optimum value (vertical upward return force). It is good to set.

図３は図１の本発明による給紙装置の反転ガイド部材への通紙時の挙動を説明する概略図である。図４は図３の原点位置から下降した反転ガイド部材を示す概略図である。図５は図４の下降した位置から上昇した反転ガイド部材を示す概略図である。図６は上昇した反転ガイド部材が原点位置に留まることを示す概略図である。
図３および図４において、図３の原点位置で用紙先端が反転ガイド部材４の可動部６に接触すると、コイルバネ９が縮み、この可動部６は垂直下方向に変位する。
その後、図５に示すように一旦縮んだコイルばね９の戻し力によって可動部６は原点に復帰する方向（垂直上方向）に変位する。この力が上向き搬送のさい大きな搬送力を稼げる。
反転ガイド部材４が原点に復帰すると、可動部６はストッパ爪１０によりそれより搬送路を狭くする方向（図示）に動けず原点で停止できる。
ストッパ爪１０と反転ガイド部材４の衝突音の防止のため、ストッパ爪１０の内側にはスポンジやマジックテープなどを貼り付けると良い。用紙後端が反転ガイド部材４を弾くさいにも、可動部６の上記の動きにより、弾き音を緩和させることができる。
図７は本発明による給紙装置の反転ガイド部材の第２の実施の形態を示す断面図である。この第２の実施の形態においては、第１の実施例と同様に反転ガイド部材４は可動部（上）６と固定部（下）７の２個の部品からなる。
また、前記実施形態とは異なり、可動部６は搬送面に直交する方向１１に可動であるので、第１の実施の形態と同様に第２の搬送手段に向かう搬送力を稼げるとともに、用紙後端が反転ガイド部材４に接触するさいの弾き音を緩和させることができる。
第１および第２の実施の形態ともに、反転ガイド部材４を可動にする手段として、コイルばね以外に板ばね、捻りばね、エアークッション、スポンジ、ゴムなどを使用しても良い。
なお、本発明の用紙搬送機構は給紙装置に適用できるが、この給紙装置は複写機、プリンタ、ファクシミリ装置などの画像形成装置に適用可能である。 FIG. 3 is a schematic view for explaining the behavior of the paper feeding device according to the present invention shown in FIG. FIG. 4 is a schematic view showing the reverse guide member lowered from the origin position of FIG. FIG. 5 is a schematic view showing the reversing guide member raised from the lowered position in FIG. FIG. 6 is a schematic view showing that the inverted reversing guide member remains at the origin position.
3 and 4, when the leading end of the sheet comes into contact with the movable portion 6 of the reversing guide member 4 at the origin position in FIG. 3, the coil spring 9 contracts, and the movable portion 6 is displaced vertically downward.
Thereafter, as shown in FIG. 5, the movable portion 6 is displaced in the direction of returning to the origin (vertically upward direction) by the return force of the coil spring 9 once contracted. This force can generate a large transport force when transporting upward.
When the reversing guide member 4 returns to the origin, the movable portion 6 can be stopped at the origin without moving by the stopper claw 10 in a direction (shown) in which the conveyance path is narrower than that.
In order to prevent the collision noise between the stopper claw 10 and the reversing guide member 4, sponge or magic tape or the like may be attached to the inside of the stopper claw 10. Even when the trailing edge of the sheet flips the reversing guide member 4, the above-mentioned movement of the movable portion 6 can alleviate the beating sound.
FIG. 7 is a cross-sectional view showing a second embodiment of the reverse guide member of the paper feeding device according to the present invention. In the second embodiment, the reversing guide member 4 is composed of two parts, a movable portion (upper) 6 and a fixed portion (lower) 7 as in the first embodiment.
Further, unlike the above-described embodiment, the movable portion 6 is movable in a direction 11 perpendicular to the conveyance surface, so that the conveyance force toward the second conveyance means can be obtained as in the first embodiment, and the rear side of the sheet It is possible to alleviate the sound of playing when the end contacts the reversing guide member 4.
In both the first and second embodiments, a plate spring, a torsion spring, an air cushion, a sponge, rubber, or the like may be used in addition to the coil spring as means for moving the reversing guide member 4.
The paper transport mechanism of the present invention can be applied to a paper feeding device, but this paper feeding device can be applied to an image forming apparatus such as a copying machine, a printer, and a facsimile machine.

本発明による給紙装置の反転ガイド部材の第１の実施の形態を示す断面図。Sectional drawing which shows 1st Embodiment of the inversion guide member of the paper feeder by this invention. 図２は図１の反転ガイド部材の斜視図。FIG. 2 is a perspective view of the reverse guide member of FIG. 図１の本発明による給紙装置の反転ガイド部材への通紙時の挙動を説明する概略図。FIG. 2 is a schematic diagram illustrating a behavior when a sheet is fed to a reverse guide member of the sheet feeding device according to the present invention of FIG. 1. 図３の原点位置から下降した反転ガイド部材を示す概略図。FIG. 4 is a schematic view showing a reverse guide member lowered from the origin position in FIG. 3. 図４の下降した位置から上昇した反転ガイド部材を示す概略図。Schematic which shows the inversion guide member raised from the lowered position of FIG. 上昇した反転ガイド部材が原点位置に留まることを示す概略図。Schematic which shows that the reverse reversing guide member which raised has stayed in the origin position. 本発明による給紙装置の反転ガイド部材の第２の実施の形態を示す断面図。Sectional drawing which shows 2nd Embodiment of the inversion guide member of the paper feeder by this invention. 従来の給紙装置の１例を示す概略図。Schematic which shows an example of the conventional paper feeder.

符号の説明Explanation of symbols

１ 給紙装置（給紙トレイ）
１ａ 搬送面
２ａ 第１の搬送手段（給紙コロ）
３ 第２の搬送手段（搬送ローラ）
４ 反転ガイド部材
６ 反転ガイド部材の可動部
９ 弾性部材（コイルばね）
1 Paper feeder (paper tray)
1a Transport surface 2a First transport means (paper feed roller)
3 Second conveying means (conveying roller)
4 Reverse guide member 6 Movable part of reverse guide member 9 Elastic member (coil spring)

Claims (7)

第１の搬送手段から送り出された用紙を上方向に位置する下流側の第２の搬送手段まで搬送する画像形成装置の給紙装置における用紙搬送機構において、前記第１の搬送手段と第２の搬送手段の間に反転ガイド部材を設け、この反転ガイド部材が前記第２の搬送手段に向って可動であることを特徴とする用紙搬送機構。   In the sheet conveying mechanism of the sheet feeding device of the image forming apparatus that conveys the sheet fed from the first conveying unit to the second conveying unit located on the upstream side, the first conveying unit and the second conveying unit A sheet conveying mechanism, wherein a reversing guide member is provided between the conveying means, and the reversing guide member is movable toward the second conveying means. 前記反転ガイド部材が垂直方向に可動であることを特徴とする請求項１記載の用紙搬送機構。   2. The paper transport mechanism according to claim 1, wherein the reverse guide member is movable in a vertical direction. 前記反転ガイド部材が搬送面に対して直交する方向に可動であることを特徴とする請求項１記載の用紙搬送機構。   2. The paper transport mechanism according to claim 1, wherein the reverse guide member is movable in a direction orthogonal to the transport surface. 前記反転ガイド部材の可動部が弾性部材によって支持されていることを特徴とする請求項１ないし３のいずれか１項記載の用紙搬送機構。   4. The paper transport mechanism according to claim 1, wherein the movable portion of the reverse guide member is supported by an elastic member. 前記弾性部材が前記反転ガイド部材の内側に装填されることを特徴とする請求項４記載の用紙搬送機構。   5. The paper transport mechanism according to claim 4, wherein the elastic member is loaded inside the reversing guide member. 前記第１の搬送手段として給紙コロ、前記第２の搬送手段として搬送ローラを用いた請求項１記載の用紙搬送機構を備えることを特徴とする給紙装置。   2. A sheet feeding apparatus comprising: a sheet conveying mechanism according to claim 1, wherein a sheet feeding roller is used as the first conveying unit and a conveying roller is used as the second conveying unit. 請求項６記載の給紙装置を備えたことを特徴とする画像形成装置。

An image forming apparatus comprising the sheet feeding device according to claim 6.

JP2003320458A 2003-09-11 2003-09-11 Paper delivery mechanism, paper feeding device, and image formation device Pending JP2005089008A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
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JP2008056487A (en) * 2006-07-31 2008-03-13 Ricoh Co Ltd Sheet carrying device, image reader, and image forming device
JP2008214018A (en) * 2007-03-02 2008-09-18 Ricoh Co Ltd Sheet conveying device, image reading device and image forming device
JP2008214017A (en) * 2007-03-02 2008-09-18 Ricoh Co Ltd Sheet conveying device, image reading device and image forming device
US7621519B2 (en) 2005-09-13 2009-11-24 Ricoh Company, Limited Sheet conveying apparatus, image reading apparatus, and image forming apparatus
US7922167B2 (en) 2006-10-04 2011-04-12 Ricoh Company, Limited Sheet conveying device, and image forming apparatus including same
US7992858B2 (en) 2006-04-19 2011-08-09 Ricoh Company, Ltd. Sheet conveying apparatus, image scanning apparatus, and image forming apparatus
US8177216B2 (en) 2007-02-26 2012-05-15 Ricoh Company, Ltd. Sheet conveying device with hold and transfer unit
US8944708B2 (en) 2006-08-11 2015-02-03 Ricoh Company, Ltd. Sheet conveying device, and image forming apparatus including same
US9207617B2 (en) 2008-01-22 2015-12-08 Ricoh Company, Ltd. Sheet transfer apparatus and image forming apparatus

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7621519B2 (en) 2005-09-13 2009-11-24 Ricoh Company, Limited Sheet conveying apparatus, image reading apparatus, and image forming apparatus
US7992858B2 (en) 2006-04-19 2011-08-09 Ricoh Company, Ltd. Sheet conveying apparatus, image scanning apparatus, and image forming apparatus
JP2008056487A (en) * 2006-07-31 2008-03-13 Ricoh Co Ltd Sheet carrying device, image reader, and image forming device
US8944708B2 (en) 2006-08-11 2015-02-03 Ricoh Company, Ltd. Sheet conveying device, and image forming apparatus including same
US7922167B2 (en) 2006-10-04 2011-04-12 Ricoh Company, Limited Sheet conveying device, and image forming apparatus including same
US8177216B2 (en) 2007-02-26 2012-05-15 Ricoh Company, Ltd. Sheet conveying device with hold and transfer unit
US8485516B2 (en) 2007-02-26 2013-07-16 Ricoh Company, Ltd. Sheet conveying device, and image forming apparatus including same
JP2008214018A (en) * 2007-03-02 2008-09-18 Ricoh Co Ltd Sheet conveying device, image reading device and image forming device
JP2008214017A (en) * 2007-03-02 2008-09-18 Ricoh Co Ltd Sheet conveying device, image reading device and image forming device
US7681874B2 (en) 2007-03-02 2010-03-23 Ricoh Company, Ltd. Sheet conveying device, and image forming apparatus including same
US7690639B2 (en) 2007-03-02 2010-04-06 Ricoh Company, Ltd. Sheet conveying device, and image forming apparatus including same
US9207617B2 (en) 2008-01-22 2015-12-08 Ricoh Company, Ltd. Sheet transfer apparatus and image forming apparatus

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