JPS59230930A - Sheet conveying device - Google Patents

Abstract

PURPOSE:To prevent a belt outer surface from smudging, by making up a belt pressing part to a sheet slinding surface member face, namely, a belt outer surface part carrying an elastic projecting part so as to come into a state of being pressed against the sliding surface member face all the time via a conveyed load . CONSTITUTION:When a surface of a belt member 2 at the side to a surface of a sheet sliding surface member 1 is set down to a belt surface while its reverse side to a belt backside, an elastic projecting part 8 is formed on the belt backside, and an opposed surface part 9 opposite to the surface of the member 1 centering on the member 2 is set up at the side of the belt backside in parallel with the surface of the member 1. In addition, an opposed interval (d) between these member 1 and 9 is made to be smaller than height (h) in time of a state of freedom inclusive of thickness in the member 2 of the elastic projecting part 8 whereby the member 2 is made so as to be forcibly pressed to the surface of the member 1 by dint of flexible reaction force base on a difference between an opposed interval of the elastic projecting part 8 moving and passing through the within of the opposed interval (d) between these members 1 and 9 following movements of the member 2 and the height of the projecting part. With this constitution, a concentrated smudge part on a belt outer surface is thus prevented.

Description

【発明の詳細な説明】 本発明はシート搬送装置に関する。[Detailed description of the invention] The present invention relates to a sheet conveying device.

更に詳しくは、被搬送物たるシートの滑り摩擦抵抗の小
さいシート滑らせ面部材面にシートの滑り摩擦抵抗の大
きい面移動ベルト部材面を押圧接触させ、その両部材間
にシートを導入してサンドイッチに挾み込ませ、ベルト
部材の押圧力と面移動でシートをシート滑らし面部材上
を滑り移動させて搬送する方式の装置の改善に関する。More specifically, a sheet sliding surface member surface having a low sliding frictional resistance of a sheet to be conveyed is brought into pressure contact with a moving belt member surface having a high sliding frictional resistance of the sheet, and a sheet is introduced between the two members to form a sandwich. The present invention relates to an improvement of a device in which a sheet is conveyed by being sandwiched between the sheets and slidingly moved on a sheet sliding surface member using the pressing force and surface movement of a belt member.

第１図は上記方式のシート搬送装置の具体例の極く概略
構成図で、１はシート滑らし面部材、２は面移動ベルト
部材としての無端ベルトで、駆動ローラ３とターンロー
ラ４間に張設してあり、その下側ベル）２ａの外表面を
部材１の上面に対して下側ベルト押圧コロ５により全面
的に押圧接触させである。下側ベルト押圧コ０５は下側
ベルト２ａと上側ベルト２ｂの間室間に下側ベル）２ａ
の長手に沿って適当間隔毎に設けた複数個の自由回転コ
ロで、それ等のコロの下面が下側ベルト２ａの裏面に不
図示のばねの付勢力で接触して下側ベルト２ａの外表面
をシート滑らし面部材１面に押圧する。ベルト２は駆動
ローラ３の矢示方向の回転力で時計方向に回転駆動され
る。FIG. 1 is a very schematic configuration diagram of a specific example of the sheet conveying device of the above type, in which 1 is a sheet sliding surface member, 2 is an endless belt as a surface moving belt member, and is stretched between a drive roller 3 and a turn roller 4. The outer surface of the lower bell 2a is brought into full pressure contact with the upper surface of the member 1 by a lower belt pressing roller 5. The lower belt presser 05 is located between the lower belt 2a and the upper belt 2b (lower belt) 2a.
A plurality of freely rotating rollers are provided at appropriate intervals along the length of the rollers, and the lower surfaces of these rollers contact the back surface of the lower belt 2a with the biasing force of a spring (not shown), so that the outer surface of the lower belt 2a Press the surface against one surface of the sheet sliding surface member. The belt 2 is rotated clockwise by the rotational force of the drive roller 3 in the direction of the arrow.

而して下側ベルト２ａの右端の駆動ローラ懸回ベルト部
分下面部とシート滑らし面部材１面とのなすクサビ空間
部をシート導入部６としてそのシート導入部６ヘシート
Ｐを導入すると、そのシートの先端が下側ベルト２ａの
右端と部材１面との間にくわえ込まれ、ベルト２の回動
に伴なう下側ベルト２ａの左方への面移動動力と押圧力
で下側ベルｈ２ａと部材１面間にサンドイッチに挾まれ
て引き込まれ部材１面に沿って左方へ搬送される。この
場合シートＰは部材１面とは滑り摩擦抵抗が小さく、ベ
ルト２とは滑り摩擦抵抗が大きいからベルト面とは滑り
ずれを起さず、部材１面とは容易に滑りを生じ、その結
果シートＰはベルト２の回動駆動速度と同じ速度で部材
１面上を左方へ滑り移動して搬送されるものである。When the sheet P is introduced into the sheet introduction section 6, the wedge space formed by the lower surface of the drive roller hanging belt at the right end of the lower belt 2a and the sheet sliding surface member 1 is used as the sheet introduction section 6. The tip of the lower belt 2a is held between the right end of the lower belt 2a and the surface of the member 1, and the lower belt 2a is moved by force and pressing force to the left as the belt 2 rotates. The material is sandwiched between the two sides of the member and pulled in, and conveyed to the left along the first side of the member. In this case, the sheet P has a low sliding frictional resistance with the member 1 surface, and a large sliding frictional resistance with the belt 2, so it does not slip on the belt surface, but easily slips with the member 1 surface, and as a result, The sheet P is conveyed by sliding to the left on one surface of the member at the same speed as the rotational drive speed of the belt 2.

このようなシート搬送装置は例えば電子複写機・画像読
取り記録装置など各種画像形成装置に於て原稿プラテン
ガラス上にシート原稿を自動搬送する原稿自動搬送装置
として活用されている。これは第１図例装置に於けるシ
ート滑らし面部材１を原稿プラテンガラスとし、そのガ
ラスの上に上記のようなベルト部材２を配設し、シート
導入部６にシート原稿Ｐを画像面下向きにして手差し方
式で或は１枚宛自動給送機構で導入してプラテンガラス
１上を滑り移動搬送させ、その原稿Ｐがプラテンガラス
１上の所定位置まで搬送された時点でベルト２の駆動を
自動停止させ、この停止の間にプラテンガラス１上の下
向き画像面の光学走査・読取り走査等をプラテンガラス
１を通して行なわせ、その後ベルトを再駆動させてシー
ト導入部６側と反対側方向へ排出させるもので、この原
稿搬送サイクルを画像形成装置側のプロセス実行サイク
ルと連係させて繰返し実行させることにより多数枚の原
稿の複写処理等を能率的に行なうことが可能となる。プ
ラテンガラス１上へ搬送した原稿を一旦停止させず搬送
状態で光学走査等を行なうようにしたものもある。又原
稿の排出はベルト２を逆回動駆動させて導入部６側へ戻
し搬送するようにしたものもある。Such a sheet conveying device is utilized as an automatic document conveying device for automatically conveying a sheet document onto a document platen glass in various image forming apparatuses such as electronic copying machines and image reading/recording devices. In this case, the sheet sliding surface member 1 in the apparatus shown in FIG. The document P is introduced manually or by a single-sheet automatic feeding mechanism and is conveyed by sliding on the platen glass 1, and when the document P is conveyed to a predetermined position on the platen glass 1, the belt 2 is driven. It is automatically stopped, and during this stop, optical scanning, reading scanning, etc. of the downward image surface on the platen glass 1 is performed through the platen glass 1, and then the belt is driven again to eject the sheet in the direction opposite to the sheet introduction section 6 side. By repeatedly executing this document conveyance cycle in conjunction with the process execution cycle on the image forming apparatus side, it becomes possible to efficiently carry out copy processing of a large number of documents. There is also a device in which the document transported onto the platen glass 1 is optically scanned, etc., without being temporarily stopped. In some cases, the document is ejected by driving the belt 2 in reverse rotation to return it to the introduction section 6 and convey it.

ところで、このようなシート搬送装置に於る問題点の１
つとしてベルト押圧コロ５の位置に対応するベルト外面
部分の集中的な汚れ、及びその汚れによるシート滑らし
面部材１面のきす付きトラブルが上げられる。By the way, one of the problems with such a sheet conveying device is
One of the problems is that the outer surface of the belt corresponding to the position of the belt pressing roller 5 is intensively soiled, and the surface of the sheet sliding surface member 1 is scratched due to the soiling.

即ち、第１図例装置に於てシートの搬送・排出過程で下
側ベルト２ａの外表面につきシートが位置している面領
域以外の面領域はシート滑らし面部材２面に直接に抑圧
接触した状態で該部材１面−Ｆを滑り移動する、従って
ベルト２の外周面は長期的にみた場合シート滑らし面部
材１面との直接の接触移動で部材１面の汚れをひろって
少しづつ汚れるものであるが、特に押圧コロ５の位置に
対応するベルト外面部分は他の面部分よりも部材１面に
強く抑圧接触して移動するから汚れの進行度合が早くわ
だち（轍）後のように帯状に集中的に汚れ７（第２図）
を生じ且つその汚れ７は強固で蓄積化する。そして上記
コロ５位置に対応するベルト外面部分に生じた帯状の汚
れ部分７の蓄積汚れが逆にシート滑らし面部材１面に転
写されて該部材１面を汚したり、擦過きずを生じさせた
りするトラブル原因となる。原稿自動搬送装置の場合は
シート滑らし面部材たる原稿プラテンガラス１面を汚し
たりきす付けたりすることになり、得られる複写画像品
位が損なわれる結果となる。That is, in the apparatus shown in FIG. 1, during the conveyance and discharge process of the sheet, the surface area of the outer surface of the lower belt 2a other than the surface area where the sheet is located was in direct pressure contact with the surface of the sheet sliding surface member 2. Therefore, in the long term, the outer circumferential surface of the belt 2 will gradually become dirty as it picks up dirt on the surface of the member 1 due to direct contact movement with the sheet sliding surface member 1 surface. However, since the outer surface of the belt, which corresponds to the position of the pressing roller 5, moves in stronger pressure contact with one surface of the member than other surfaces, the dirt progresses quickly and forms a strip like a rut. Concentrated dirt 7 (Figure 2)
The dirt 7 is strong and accumulates. Then, the dirt accumulated in the band-shaped dirt portion 7 generated on the outer surface of the belt corresponding to the position of the roller 5 is transferred onto the surface of the sheet sliding surface member 1, staining the surface of the member 1 or causing scratches. It may cause trouble. In the case of an automatic document feeder, the surface of the document platen glass, which is a sheet sliding surface member, becomes dirty or scratched, resulting in a loss in the quality of the resulting copied image.

本発明はこの種のベルト式シート搬送装置に於てシート
滑らし面部材１に対するベルトの抑圧接触手段を工夫し
てベルト外面に上記のような集中的な汚れ部分７を生じ
させないように改善したものを提供することを目的とす
る。The present invention is a belt-type sheet conveying device of this type, in which the suppressing contact means of the belt with respect to the sheet sliding surface member 1 is devised to prevent the above-mentioned concentrated dirt portion 7 from occurring on the outer surface of the belt. The purpose is to provide

即ち本発明は、シート滑らし面部材面に面移動ベルト部
材面を抑圧接触させ、その両部材面間に被搬送部材たる
シートを導入してベルト部材の押圧力と面移動力で導入
シートをシート滑らし面部材面上を滑り移動させて搬送
する方式のシート搬送装置に於て、シート滑らし面部材
面に接する側のベルト部材面をベルト表面、その反対面
をベルト裏面としたとき、ベルト裏面に弾性突起部を形
成し、ベルト裏面側にベルト部材を中にしてシート滑ら
し面部材面に対向する対向面部材をシート滑らし面部材
面に並行に配設し、シート滑らし面と該対向面部材との
対向間隔をベルト裏面に形成した弾性突起部のベルト部
材の厚さを含む自由状態時の高さよりも小さくし、ベル
ト部材の移動に伴ない上記シート滑らし面部材と対向面
部材との対向間隔内を移動通過する弾性突起部の上記対
向間隔と突起部高さの差に基づくたわみ反力でベルト部
材をシート滑らし面部材面に押圧させるようにしたこと
を特徴とするシート搬送装置を要旨とする。That is, in the present invention, the surface of the surface-moving belt member is brought into pressure contact with the surface of the sheet sliding surface member, the sheet, which is the conveyed member, is introduced between the surfaces of the two members, and the introduced sheet is moved into the sheet by the pressing force and surface-moving force of the belt member. In a sheet conveying device that transports the sheet by sliding it on the surface of the sliding surface member, when the side of the belt member that is in contact with the sheet sliding surface member surface is the front surface of the belt and the opposite surface is the back surface of the belt, the back surface of the belt is An elastic protrusion is formed, and an opposing surface member facing the sheet sliding surface member surface is arranged parallel to the sheet sliding surface member surface with the belt member inside on the back side of the belt, and the sheet sliding surface and the opposing surface member are arranged in parallel to the sheet sliding surface member surface. The opposing distance between the sheet sliding surface member and the opposing surface member is made smaller than the height of the elastic protrusion formed on the back surface of the belt in a free state including the thickness of the belt member, and as the belt member moves, the opposing distance between the sheet sliding surface member and the opposing surface member increases. The object of the present invention is to provide a sheet conveying device characterized in that a belt member is pressed against a surface of a sheet sliding surface member by a deflection reaction force based on the difference between the facing interval of the elastic protrusions that move and pass through the inner surface and the height of the protrusions. do.

第３〜５図は上記本発明装置の一例の概略構成を示すも
ので、第１図例装置と共通する部材は同一符号を付した
。８はベルト部材２の裏面に形成した弾性突起部（例え
ばゴム突起）で、本例装置の場合は第６図に示すように
ベルト幅方向に４つの突起部を互に間隔をおいて１列形
成しである。3 to 5 schematically show the structure of an example of the apparatus of the present invention, and the same reference numerals are given to the same members as in the apparatus of the example shown in FIG. Reference numeral 8 denotes elastic protrusions (for example, rubber protrusions) formed on the back surface of the belt member 2. In the case of this device, four protrusions are arranged in one row at intervals in the belt width direction, as shown in FIG. It is formed.

ｈ（第４図）はその突起部の、ベルト部材２の厚さを含
む自由状態時の高さ寸法である。９は無端ベルト２の下
側ベルト２ａの裏面側に配設したシート滑らし面部材１
面に並行の対向面部材、ｄはその両部材１・９面間の対
向間隔である。この対向間隔ｄは上記弾性突起部の高さ
ｈよりも小さく設定しである。１０−１１はベルト駆動
ローラ３とターンローラ４の外周面に形成した、上記各
突起部８の嵌入通過する円周溝部である。h (FIG. 4) is the height dimension of the protrusion in the free state, including the thickness of the belt member 2. Reference numeral 9 denotes a sheet sliding surface member 1 disposed on the back side of the lower belt 2a of the endless belt 2.
The opposing surface member parallel to the surface, d is the opposing distance between the 1st and 9th surfaces of both members. This opposing distance d is set smaller than the height h of the elastic protrusion. Reference numeral 10-11 denotes a circumferential groove formed on the outer circumferential surface of the belt drive roller 3 and turn roller 4, into which each of the protrusions 8 is inserted.

而してシート導入部６からシートＰが導入されると、そ
のシートＰは導入前時点から回動駆動の開始されている
ベルト２の下側ベル）２ａとシート滑らし面部材１面間
に先端部がくわえ込まれて部材１面に沿って引き込まれ
る。この場合、そのシー）Ｐの先端部が第５図示のよう
に成る長さ文だけ引き込まれた時点で、２点鎖線水のよ
うに裏面側に上記弾性突起部８の存在す・るベルト外面
部分がシー８２面に回動位置して接する関係構成にする
。その時点から更にベルト２の回動が少し進行すると弾
性突起部８が対向面部材９の右端部に至り次いでその突
起部８は引続くベルト２の回動により部材１・９面間の
間隔部内に入り込んで通過移動する。この場合間隔部の
間隔寸法ｄは自由状態の弾性突起部８の高さ寸法りより
小さく設定されているからその差分或はシートＰの厚さ
が比較的厚いものである場合には上記差分とシー）Ｐの
厚さ分を加えた分だけたわんだ状態（第４図実線示）と
なって部材１・９面間に入り込んで通過移動する。その
結果上記弾性突起部８が部材１・９面間の間隔部に入り
込んだ時点からベルトの回動に伴ないその間隔部を左方
へ移動通過して部材９の左端部へ至り間隔部から抜は出
るまでの間弾性突起部８の上記自己弾性に抗するたわみ
反力Ｆ（第４図）でその弾性突起部形成部分のベルト部
分がシート滑らし面部材１面方向に積極的な押圧力を受
ける。そのためシートＰの先端部分がそのベルト部分と
シート滑らし面部材１面間にしっかりと挾まれ、シート
滑らし面部材１面の沿うシートＰの安定な搬送がなされ
るものである。When the sheet P is introduced from the sheet introducing section 6, the leading end of the sheet P is placed between the lower bell 2a of the belt 2, whose rotational drive has been started before the introduction, and the surface of the sheet sliding surface member. part is held in the mouth and drawn along one surface of the member. In this case, when the tip of the sea) P is pulled in by the length shown in Figure 5, the outer surface of the belt where the elastic protrusion 8 is present on the back side as shown by the two-dot chain line The portion is in a rotational position and in contact with the sea 82 surface. As the belt 2 rotates a little further from that point, the elastic protrusion 8 reaches the right end of the opposing surface member 9, and as the belt 2 continues to rotate, the elastic protrusion 8 moves into the space between the surfaces of the members 1 and 9. Enter and move through. In this case, since the interval dimension d of the interval part is set smaller than the height dimension of the elastic protrusion part 8 in the free state, the difference between them or the above difference when the thickness of the sheet P is relatively thick. It is bent by the thickness of P (as shown by the solid line in FIG. 4), enters between the surfaces 1 and 9 of the members, and moves through it. As a result, from the point at which the elastic protrusion 8 enters the gap between the surfaces of the members 1 and 9, it moves leftward through the gap as the belt rotates, reaches the left end of the member 9, and leaves the gap. Until it comes out, due to the reaction force F (Fig. 4) of deflection that resists the self-elasticity of the elastic protrusion 8, the belt portion where the elastic protrusion is formed exerts an active pressing force in the direction of the sheet sliding surface member 1. receive. Therefore, the leading end portion of the sheet P is firmly sandwiched between the belt portion and the surface of the sheet sliding surface member, and the sheet P is stably conveyed along the surface of the sheet sliding surface member.

以上のような構成にすることによりシート滑らし面部材
１面に対するベルトの抑圧部、即ち弾性突起部８の存在
するベルト外面部は常に被搬送物たるシートＰを介して
シート滑らし面部材１面に押圧状態となり該部材１面に
直接に接触して摺動移動しないから部材１面の汚れをひ
ろうことがなく、その部分についての集中的な汚れを生
じない。シートＰとの接触によるシーｈＰ側の汚れをひ
ろうことはあってもその汚れ度合は小さく又小範囲なも
のであり、第１慟２図例のベルト押圧コロ５を具備させ
てなる装置よりもベルト外面の経時的汚れは大幅に防止
される。従ってベルト外面の汚れに基づくシート滑らし
面部材１面の擦過きず発生等のトラブルも長期にわたっ
て防止されるもので、所期の目的がよく達成される。With the above configuration, the suppressing part of the belt against the surface of the sheet sliding surface member, that is, the outer surface of the belt where the elastic protrusion 8 is present, is always pressed against the surface of the sheet sliding surface member through the sheet P, which is the conveyed object. Since it is in a pressed state and does not slide in direct contact with the surface of the member, it does not pick up dirt on the surface of the member and does not cause concentrated dirt on that part. Even if dirt is picked up on the seahP side due to contact with the sheet P, the degree of dirt is small and in a small area, and it is better than the device equipped with the belt pressing roller 5 shown in Fig. 1, Fig. 2. Contamination of the outer surface of the belt over time is largely prevented. Therefore, troubles such as the occurrence of scratches on the sheet sliding surface member due to dirt on the outer surface of the belt can be prevented for a long period of time, and the intended purpose can be well achieved.

第６・７図は上記本発明を適用して構成した、画像形成
装置等に於ける原稿自動搬送装置の一例の縦断正面図と
、駆動の平面図である。図において、２１はシート原稿
を載置する入口トレイで、その人口トレイ２１上のシー
ト原稿Ｐは画像面を下向きにして載置されている。また
、ピックアップローラ２３はゴム系の摩擦係数の大きい
材質で構成され送りローラ軸２２を中心にＡ−Ｂ方向に
揺動する。この送りローラ軸２２には送りローラ２５（
ピックアップローラ２３と同一材質）が固定されており
、送りローラ軸２２が回転するとともに回転し、この回
転ギヤ（図示せず）によりピックアップローラ２３にも
伝わり、送りローラ２５とピックアップローラ２３は同
一回転方向となるよう、又ローラ周速が同一となるよう
構成されている。また第１の給紙ローラ２４は回転軸（
図示せず）が給紙トレイ２１に固着され、ピックアップ
ローラ２３と第１の給紙ローラ２４の間にシート原稿Ｐ
が挿入され、ピックア・ンプローラ２３が原稿を押しつ
け、搬送される時に従動するように構成されている。ま
た第２の給紙ローラ２６は給紙ローラ軸２２に向かって
押しつけ力を持つようスライド自在に構成されており、
シート原稿が送りローラ２５と第２の送りローラ２６と
の間を通る時には従動するよう構成されている。またピ
ックアップアーム２８はピックアップアーム２７を揺動
軸として揺動し、一端にＵ字型の溝２８ａをもっている
。そして送すローラ軸２２を揺動軸として揺動する給紙
アーム２９に固着された軸２９ａとかん合している。こ
れによりピックアップアーム軸２７が反時計方向に揺動
回転すると、ピックアップアーム２８は反時計方向に揺
動し、又給紙アーム２９も送すローラ軸２２を中心とし
て反時計回り（Ａ方向）に揺動する。この時ピックアッ
プアーム２３は第１の給紙２４か、ら離れる。次にピッ
クアップアーム２７が時計方向に揺動回転すると、ピッ
クア・ンプアーム２８は時計方向に揺動し、給紙アーム
２９も送すローラ軸２２を中心として時計方向（Ｂ方向
）に揺動する。6 and 7 are a longitudinal sectional front view and a drive plan view of an example of an automatic document conveying device in an image forming apparatus or the like constructed by applying the present invention. In the figure, reference numeral 21 denotes an entrance tray on which a sheet original is placed, and the sheet original P is placed on the artificial tray 21 with its image surface facing downward. Further, the pickup roller 23 is made of a rubber-based material with a large coefficient of friction, and swings in the direction A-B about the feed roller shaft 22. This feed roller shaft 22 has a feed roller 25 (
The same material as the pickup roller 23) is fixed, and rotates as the feed roller shaft 22 rotates, and the rotation is transmitted to the pickup roller 23 by this rotating gear (not shown), so that the feed roller 25 and the pickup roller 23 rotate at the same time. The rollers are configured to have the same rotational speed and the same circumferential speed. Further, the first paper feed roller 24 has a rotating shaft (
(not shown) is fixed to the paper feed tray 21, and a sheet document P is fixed between the pickup roller 23 and the first paper feed roller 24.
is inserted, and the pick-up roller 23 presses the document and is configured to be driven when the document is conveyed. Further, the second paper feed roller 26 is configured to be slidable so as to have a pressing force toward the paper feed roller shaft 22.
When the sheet document passes between the feed roller 25 and the second feed roller 26, it is configured to be driven. Further, the pickup arm 28 swings about the pickup arm 27 as a swing axis, and has a U-shaped groove 28a at one end. It is engaged with a shaft 29a fixed to a paper feed arm 29 that swings using the feeding roller shaft 22 as a swing shaft. As a result, when the pickup arm shaft 27 swings and rotates counterclockwise, the pickup arm 28 swings counterclockwise, and the paper feed arm 29 also swings counterclockwise (in the A direction) around the feeding roller shaft 22. oscillate. At this time, the pickup arm 23 separates from the first paper feed 24. Next, when the pickup arm 27 swings clockwise, the pick-up arm 28 swings clockwise, and the paper feed arm 29 also swings clockwise (direction B) about the feeding roller shaft 22.

この時第１の給紙ローラ２４と離れていたピックアップ
ローラ２３は第１の給紙ローラ２４と圧接し、シート原
稿Ｐがある時シート原稿をはさみ込み給紙可能状態とな
る。At this time, the pickup roller 23, which was separated from the first paper feed roller 24, comes into pressure contact with the first paper feed roller 24, and when there is a sheet document P, the sheet document is sandwiched and the sheet document can be fed.

原稿有無センサ３１はシート原稿有無を検知する反射型
のセンサである。先端検知センサ３２はシート原稿の先
端を検知する反射型センサである。さらに全面ベルト２
はシー）［稿全面をカバーする大きさの幅をもった無端
ベルトであり、表面は原稿を摩擦力で搬送できるよう十
分な摩擦係数をもったゴム系の材質がコーティングされ
ている。また汚れた時でもアルコール等で汚れが落ちる
よう処理がほどこされている。そしてこの全面ベルト２
は駆動ローラ３及びターンローラ４にかけられており、
ターンローラ４は第６図左方にその軸４ａに力が加わっ
てベルト２が張力を十分持ち駆動ローラ３と全面ベルト
２とが滑りをおこさないように構成されている。排出検
知センサ３３は反射型センサで、シート原稿排出を検知
し、ある一定時間原稿が通らないとジャムランプを点燈
させる。The document presence/absence sensor 31 is a reflective sensor that detects the presence or absence of a sheet document. The leading edge detection sensor 32 is a reflective sensor that detects the leading edge of a sheet document. Furthermore, the full belt 2
It is an endless belt with a width large enough to cover the entire surface of the document, and its surface is coated with a rubber-based material that has a sufficient coefficient of friction to transport the document using frictional force. Also, even if it gets dirty, it has been treated with alcohol to remove the dirt. And this full belt 2
is applied to the drive roller 3 and turn roller 4,
The turn roller 4 is constructed so that a force is applied to its shaft 4a to the left in FIG. 6, so that the belt 2 has sufficient tension so that the drive roller 3 and the entire belt 2 do not slip. The discharge detection sensor 33 is a reflective sensor that detects discharge of a sheet document, and turns on a jam lamp if no document passes for a certain period of time.

排出ローラ３０は排出コロ３４により押圧を受けており
、原稿プラテンガラスｌ上でコピーが終了したシート原
稿をはさみ込んで排出する。排出コロ３４はシート原稿
の動きに従動する。そして排出ローラ３０により排出さ
れた原稿は排紙トレイ１２に順次に積込まれる。排紙コ
ロ３４は排紙トレイ１２への積込みをよくするためロー
ラ・ント形状となっている。The discharge roller 30 is pressed by a discharge roller 34, and the sheet document which has been copied on the document platen glass 1 is caught and discharged. The discharge roller 34 follows the movement of the sheet document. The documents discharged by the discharge roller 30 are sequentially loaded onto the paper discharge tray 12. The paper discharge roller 34 has a roller-like shape to facilitate loading onto the paper discharge tray 12.

次に第７図により駆動部の一実施例を説明をする。駆動
ギヤ４２はモータ４３の回転軸４３ａに固着されアイド
ラギヤ４１を介してギヤ４０にモータの駆動が伝わる。Next, an embodiment of the driving section will be explained with reference to FIG. The drive gear 42 is fixed to the rotating shaft 43a of the motor 43, and the drive of the motor is transmitted to the gear 40 via the idler gear 41.

ギヤ４０の回転は電磁クラッチ３５のオン・オフによっ
てクラ、ンチ軸４′４に伝わり、電磁クラッチ３５に通
電された時オン状態となる。電磁ブレーキ１４はクラ・
ンチ軸４４の回転を停止する働きをし、電磁ブレーキ１
４に通電されるとクラッチ軸４４の回転は停止する。The rotation of the gear 40 is transmitted to the clutch shaft 4'4 by turning on and off the electromagnetic clutch 35, and when the electromagnetic clutch 35 is energized, it is turned on. The electromagnetic brake 14 is
The electromagnetic brake 1 functions to stop the rotation of the punch shaft 44.
When the clutch shaft 44 is energized, the rotation of the clutch shaft 44 is stopped.

ギヤ３６はクラッチ軸４４に固着されクラッチ軸４４が
回転すると回転し、クロック円板ギヤ３７に回転を伝え
増速してクロ・ンク円板３８を回転させる。クロック円
板３８は円周上に細かい溝を有し、フォトインクラブタ
３９は溝数を読んでクロック数を数える。そしてクラッ
チ軸４４の回転はクラッチ軸４４に固着された駆動プー
リ１５と駆動ローラ軸３ａに固着された従動プーリ１６
にかけられたベルト１７により駆動ローラ軸３ａに伝わ
る。またプーリ（大）５０は駆動ローラ軸３ａ上にバネ
クラッチ（図示せず）を介して取りついており、バネク
ラッチ制御環５１をプランジャー５２がクラッチ爪５３
を介して制御することにより駆動伝達のオン・オフおこ
なう。さらにプーリ（小）５４はベルト５５を介してプ
ーリ（大）５０の回転の伝達を受け、送りローラ軸２２
とはワンウェイクラッチ（図示せず）を介して取りつい
ている。The gear 36 is fixed to the clutch shaft 44 and rotates when the clutch shaft 44 rotates, transmitting rotation to the clock disc gear 37 to increase speed and rotate the clock disc 38. The clock disk 38 has fine grooves on its circumference, and the photo ink clubter 39 reads the number of grooves and counts the number of clocks. The rotation of the clutch shaft 44 is controlled by a drive pulley 15 fixed to the clutch shaft 44 and a driven pulley 16 fixed to the drive roller shaft 3a.
It is transmitted to the drive roller shaft 3a by the belt 17 that is wrapped around the belt 17. Further, the pulley (large) 50 is attached to the drive roller shaft 3a via a spring clutch (not shown), and the plunger 52 connects the spring clutch control ring 51 to the clutch pawl 53.
Drive transmission is turned on and off by controlling the Furthermore, the pulley (small) 54 receives the rotation of the pulley (large) 50 via a belt 55, and the feed roller shaft 22
are connected to each other via a one-way clutch (not shown).

全面ベルト２の周速は送りローラ２５の周速よりわずか
に速くなるよう、プーリ（大）５０とプーリ（小）５４
の直径の比が選ばれている。そしてシート原稿Ｐが全面
ベルト２にくわえこまれベルト２と同一速度となった時
、送りローラ２５はシート原稿Ｐに追従するようプーリ
（小）５４と送すローラ軸２２はワンウェイ結合されて
いる。A pulley (large) 50 and a pulley (small) 54 are installed so that the circumferential speed of the full-surface belt 2 is slightly faster than the circumferential speed of the feed roller 25.
The ratio of the diameters of is chosen. Then, when the sheet original P is gripped by the entire surface belt 2 and reaches the same speed as the belt 2, the feed roller 25 follows the sheet original P.The pulley (small) 54 and the feeding roller shaft 22 are connected in one way. .

送りローラ２５とピックアップローラ２３とは同一回転
方向・同一速度を持つようギヤ結合されている。プラン
ジャー５６はレバー５７を介してピックアップアーム軸
２７を揺動させピックアップローラ２３の上下運動を行
なう。The feed roller 25 and the pickup roller 23 are gear-coupled so that they have the same rotation direction and the same speed. The plunger 56 swings the pickup arm shaft 27 via a lever 57 to move the pickup roller 23 up and down.

８・９は第３〜５図で説明した、ベルト裏面に形成した
弾性突起部Ｔと、プラテンガラス１に対する対向面部材
である。また全面ベルトには第１及び第２のマーク部６
０ａ＠Ｓｏｂがあり、センサ６１により第１マーク部６
０ａを検知するとベルト２が制止する。Reference numerals 8 and 9 indicate the elastic protrusion T formed on the back surface of the belt and the member facing the platen glass 1, as explained in FIGS. 3 to 5. In addition, there are first and second mark portions 6 on the entire belt.
There is 0a@Sob, and the first mark part 6 is detected by the sensor 61.
When 0a is detected, the belt 2 is stopped.

次に動作を順に説明する。シート原稿Ｐを入口トレイ２
１上に載置し、ピックアップローラ２３と給紙ローラ２
４間にシート原稿を挿入する、或は原稿自動１枚分離給
送機構（不図示）により原稿が両ローラ２３−２４間に
自動挿入されると。Next, the operations will be explained in order. Place the sheet original P into the entrance tray 2.
1, the pickup roller 23 and the paper feed roller 2
When a sheet original is inserted between the two rollers 23 and 24, or when the original is automatically inserted between both rollers 23 and 24 by an automatic single-sheet separation and feeding mechanism (not shown).

原稿有無センサ３１がシート原稿を感知し、一定時間た
つとプランジャー５６が通電されピックアップローラ２
３が降下し、ピックアップローラ２３と給紙ローラ２４
で原稿をはさみ込む（シート原稿なしの状態ではピック
アップローラ２３は上方に持ち上がっている）。それと
同時にモータ４３が回転し、またクラッチ３５にも通電
され駆動ローラ３が回転する。この状態ではプランジャ
ー５２には通電されずバネクラッチ（図示せず）により
プーリ５０（大）は静止しておりシート原稿は搬送され
ない。The document presence sensor 31 detects a sheet document, and after a certain period of time, the plunger 56 is energized and the pickup roller 2
3 descends, and the pickup roller 23 and paper feed roller 24
(The pickup roller 23 is lifted upward when there is no sheet document). At the same time, the motor 43 rotates, and the clutch 35 is also energized, causing the drive roller 3 to rotate. In this state, the plunger 52 is not energized, the pulley 50 (large) is kept stationary by a spring clutch (not shown), and the sheet document is not conveyed.

モータ４３の回転により、全面ベルト２が回転し、全面
ベルト２の第２のマーク部６０ｂをセンサ６■が検知す
るとプランジャー５６に通電され、クラッチ５３が制御
環５１より離れ、駆動ローラ軸３ａの回転が送すローラ
軸２２に伝わり、送りローラ２５及びピックアップロー
ラ２３が回転する。この時にシート原稿Ｐは搬送され始
める。第２のマーク部６０ｂは原稿の先端よりうしろ側
で原稿先端に近いところに突起部８が来て（第４図、２
点鎖線水）原稿Ｐを押圧するように位置決めされている
。突起部８は前述すたように対向面部材９によって押圧
られ、原稿搬送力を十分出すことが可能である。The rotation of the motor 43 rotates the full-surface belt 2, and when the sensor 6■ detects the second mark portion 60b of the full-surface belt 2, the plunger 56 is energized, the clutch 53 is separated from the control ring 51, and the drive roller shaft 3a is moved. The rotation is transmitted to the sending roller shaft 22, and the sending roller 25 and pickup roller 23 rotate. At this time, the sheet original P starts to be conveyed. The second mark part 60b has a protrusion 8 located behind the leading edge of the original and close to the leading edge of the original (Fig. 4, 2).
(Dot-dashed line water) It is positioned so as to press the original P. The projection 8 is pressed by the opposing surface member 9 as described above, and is able to generate sufficient document conveyance force.

シート原稿Ｐは突起部８の下面によって押圧されると、
全面ベルト２の周速と同一速度となり、送りローラ２５
の周速より速くなって送りローラ２５はシート原稿Ｐに
従動する。When the sheet document P is pressed by the lower surface of the protrusion 8,
The speed is the same as the circumferential speed of the full-surface belt 2, and the feed roller 25
The feed roller 25 follows the sheet document P at a peripheral speed faster than the circumferential speed of the sheet document P.

そしてシート原稿Ｐの後端が紙有無センサ３１に検知さ
れると、プランジャー５６への通電は切れピックアップ
ローラ２３は上方に上る。又シート原稿Ｐの後端が先端
検知センサ３２に検知されるとともに、プランジャー５
２への通電は切れ、送りローラ２５及びピ・ンクアップ
ローラ２３の回転は止まる。これは次のシート原稿を受
付けない為である。When the trailing edge of the sheet document P is detected by the paper presence/absence sensor 31, the plunger 56 is de-energized and the pickup roller 23 moves upward. Further, the trailing edge of the sheet document P is detected by the leading edge detection sensor 32, and the plunger 5
2 is turned off, and the rotation of the feed roller 25 and the pink-up roller 23 is stopped. This is because the next sheet document will not be accepted.

モータ４３は全面ベルト２の略半回転で第１マーク部６
０ａがセンサ６１にくると通電が切られ、同時にクラッ
チ３５の通電が切れ、ブレーキ１４に通電され、クラッ
チ軸４４が瞬時に止まるにれにより駆動ローラ軸３ａの
回転、さらには全面ベルト２の動きが瞬時に止まり、シ
ート原稿が止まる。第１マーク部６０ａはシート原稿が
所定位置に止まるよう位置めされている。ブレーキ１４
への通電は一定時間後切れる。そしてただちに複写機本
体にコピースタート信号が送られコピーが開始され複写
機本体の露光がスタートす机 そして本体コピー終了後信号によりモータ４３が回転し
、クラッチ３５に通電されて全面ベルト２がシート原稿
Ｐを排出し始め、排出ローラ３０及び排出コロ３１間に
原稿はくわえられ、シート原稿Ｐは排紙トレイ３４上に
排出される。The motor 43 rotates the entire surface belt 2 approximately half a turn to rotate the first mark portion 6.
When 0a reaches the sensor 61, the power is turned off, and at the same time, the clutch 35 is turned off, the brake 14 is turned on, and the clutch shaft 44 stops instantaneously, causing the rotation of the drive roller shaft 3a and the movement of the entire belt 2. stops instantly and the sheet original stops. The first mark portion 60a is positioned so that the sheet original remains at a predetermined position. brake 14
Power will be cut off after a certain period of time. Immediately, a copy start signal is sent to the copying machine main body, copying starts, and exposure of the copying machine main body starts.After copying is completed, the motor 43 is rotated by the signal, the clutch 35 is energized, and the entire surface belt 2 is transferred to the sheet document. The sheet document P starts to be discharged, the document is held between the discharge roller 30 and the discharge roller 31, and the sheet document P is discharged onto the paper discharge tray 34.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はベルト押圧手段をコロとする従来装置の概略構
成図、第２図はベルト外面に帯状の汚れ部を生じた状態
のベルトの平面図、第３図は本発明装置の概略構成図、
第４図はその部分拡大図、第５図は切欠き斜面図、第６
図は原稿自動搬送装置としての実施例の縦断正面図、第
７図は駆動系の平面図。 １はシート滑らし面部材（原稿プラテンガラス）、２は
ベルト部材、８は弾性突起部、９は対向面部材。 特許出願人　キャノン株式会社 代　　　　理　　　　人　　　福　　　　　　１）　　
　　　鋪第１図 第３図 第４図Fig. 1 is a schematic diagram of a conventional device in which the belt pressing means is a roller, Fig. 2 is a plan view of the belt with band-shaped dirt on the outer surface of the belt, and Fig. 3 is a schematic diagram of the device of the present invention. ,
Figure 4 is a partially enlarged view, Figure 5 is a notched slope view, and Figure 6 is a partially enlarged view.
The figure is a longitudinal sectional front view of an embodiment as an automatic document conveying device, and FIG. 7 is a plan view of the drive system. 1 is a sheet sliding surface member (original platen glass), 2 is a belt member, 8 is an elastic protrusion, and 9 is a facing surface member. Patent applicant: Canon Co., Ltd. Agent Fuku 1)
Figure 1 Figure 3 Figure 4

Claims (1)

【特許請求の範囲】[Claims] （１）シート滑らし面部材面に面移動ベルト部材面を抑
圧接触させ、その両部材間に被搬送部材たるシートを導
入してベルト部材の押圧力と面移動力で導入シートをシ
ート滑らし面部材面上を滑り移動させて搬送する方式の
シート搬゛送装置に於て、 シート滑らし面部材面に接する側のベルト部材面をベル
ト表面、その反対面をベルト裏面としたとき、ベルトｉ
面に弾性突起部を形成し、ベルト裏面側にベルト部材を
中にしてシート滑らし面部材面に対向する対向面部材を
シート滑らし面部材面に並行に配設し、シート清ら・し
面部材と該対向面部材との対向間隔をベルト裏面に形成
した弾性突起部のベルト部材の厚さを含む自由状態時の
高さよりも小さくし、ベルト部材の移動に伴ない上記シ
ート滑らし面部材と対向面部材との対向間隔内を移動通
過する弾性突起部の上記対向間隔と突起部高さの差に基
づくたわみ反力でベルト部材をシート滑らし面部材面に
押圧させるようにした、ことを特徴とするシート搬送装
置。(1) Bring the surface of the moving belt member into pressure contact with the surface of the sheet sliding surface member, introduce the sheet as the conveyed member between the two members, and use the pressing force and surface moving force of the belt member to move the introduced sheet to the sheet sliding surface member. In a sheet conveying device that transports sheets by sliding them on a surface, when the side of the belt member in contact with the sheet sliding surface member surface is the belt front surface and the opposite surface is the belt back surface, the belt i
An elastic protrusion is formed on the surface, and an opposing surface member facing the sheet sliding surface member surface is arranged parallel to the sheet sliding surface member surface with the belt member inside on the back side of the belt. and the facing surface member is made smaller than the height of the elastic protrusion formed on the back surface of the belt in a free state including the thickness of the belt member, and as the belt member moves, it faces the sheet sliding surface member. The belt member is pressed against the surface of the sheet sliding surface member by a deflection reaction force based on the difference between the facing distance and the height of the projection between the elastic protrusions that move and pass within the facing interval with the surface member. sheet conveyance device.