JPH079866Y2 - Automatic document feeder - Google Patents

Description

【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、静電写真複写機等の画像処理装置に装備され
る自動原稿搬送装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an automatic document feeder which is installed in an image processing apparatus such as an electrostatic photocopier.

〔従来の技術〕[Conventional technology]

複写操作等のおける原稿の取り扱いを自動化するため
に、自動原稿搬送装置を画像処理装置に装備することが
広く実施されるに至っている。It has been widely practiced to equip an image processing apparatus with an automatic document feeder in order to automate the handling of a document such as a copying operation.

この種の自動原稿搬送装置として、本出願人は、第６図
に見られるように、重送防止給紙手段（上部給紙ローラ
41aと下部戻しローラ41bから成る）41の下流側に、正逆
回転可能に搬送手段43を設けると共に、下部遊端の給紙
方向下流側への撓み変形によって前記搬送手段43側への
通紙のみを許容し且つ該搬送手段43によって戻し搬送さ
れる原稿を当該搬送手段43の上方に向けて案内する可撓
性の経路切り換え部材44を、前記重送防止給紙手段41か
ら搬送手段43への給紙経路を横断させて斜設した自動原
稿搬送装置を提供している（特願昭63-61333号（特開平
1-236126号公報））。As an automatic document feeder of this type, the applicant of the present invention, as shown in FIG.
41a and a lower return roller 41b) is provided on the downstream side of 41, and a conveying means 43 is provided so as to be able to rotate in the forward and reverse directions, and the lower free end is bent and deformed toward the downstream side in the sheet feeding direction. A flexible path switching member 44 for guiding only the document which is allowed to be returned and is conveyed back by the conveying means 43 to the upper side of the conveying means 43 from the double feed preventing paper feeding means 41 to the conveying means 43. An automatic document feeder provided obliquely across the paper feeding path (Japanese Patent Application No. 63-61333).
1-236126))).

上記構成の自動原稿搬送装置によれば、搬送手段43の正
逆転による原稿のスイッチバックによって、コンタクト
ガラス42上の所定位置への原稿の搬送と複写済み原稿の
取り出し等とが正逆回転可能な搬送手段43のみで行われ
ることから、搬送系の簡略化を図れる。According to the automatic document feeder having the above-described configuration, the document is switched back by the forward / reverse rotation of the transport means 43, whereby the document can be transported to a predetermined position on the contact glass 42 and the copied document can be taken out in the forward and reverse directions. Since the transfer is performed only by the transfer means 43, the transfer system can be simplified.

〔考案が解決しようとする課題〕[Problems to be solved by the device]

ところで、前記経路切り換え部材44は、前記重送防止給
紙手段41によって給紙される原稿先端の押圧作用によ
り、下部遊端が給紙方向下流側に撓み変形されることで
原稿の通紙を許容するものである。By the way, the path switching member 44 allows the lower free end to bend and deform toward the downstream side in the paper feeding direction by the pressing action of the front end of the document fed by the double-feed preventing paper feeding means 41, so that the document is passed. It is acceptable.

一方、前記重送防止給紙手段41によって給紙される原稿
は、その先端が上部側の給紙ガイド46に沿って前記経路
切り換え部材44の腰の強い基部側を押圧するものであ
り、然るに、原稿が厚手で腰の強いものの場合は、当該
原稿が経路切り換え部材44の腰の強さに打ち勝って経路
切り換え部材44を撓ませ得ることから通紙上の問題はな
いのであるが、薄手で腰の弱い原稿ｒを給紙対象にした
場合に、当該原稿ｒが経路切り換え部材44の腰の強さに
負けて該経路切り換え部材44を給紙方向下流側に撓み変
形させ得ず、而して、原稿ｒの先端が経路切り換え部材
44に当接して後は原稿ｒの先端が経路切り換え部材44の
上流側の面部を滑ってしまって、前記経路切り換え部材
44を撓み変形させる力が消失してしまい、原稿ｒが腰砕
けの状態になって搬送手段43への通紙が不能になること
から紙詰まりを生じることがあった。On the other hand, the document fed by the double-feed preventing sheet feeding means 41 has its leading end pressed against the strong base side of the path switching member 44 along the sheet feeding guide 46 on the upper side. If the original is thick and strong, the original can overcome the strength of the path switching member 44 and bend the path switching member 44, so there is no problem in passing the paper. When a document r having a weakness is targeted for feeding, the document r loses the stiffness of the path switching member 44 and cannot flex and deform the path switching member 44 downstream in the paper feeding direction. , The leading edge of the original r is a path switching member
After abutting against 44, the leading edge of the original document r slips on the upstream surface of the path switching member 44, and
Since the force for bending and deforming 44 disappears, the original document r becomes unstuck, and it becomes impossible to pass the sheet to the conveying unit 43, which may cause a sheet jam.

かと言って、前記上部側の給紙ガイド46によって前記原
稿ｒの先端を経路切り換え部材44の下部遊端側に案内さ
せるようにすると、原稿先端が搬送手段43に到達した時
の前記重送防止給紙手段41の給紙停止下において、次な
る不都合を生じるものであった。However, when the leading edge of the original document r is guided to the lower free end side of the path switching member 44 by the upper side paper feed guide 46, the double feed is prevented when the leading edge of the original document reaches the conveying means 43. The following inconveniences occurred when the paper feeding of the paper feeding means 41 was stopped.

即ち、給紙対象が薄手で腰の弱い原稿ｒの場合には、そ
れ自体が撓んで前記上部給紙ローラ41aの切除部ｅと上
部側の給紙ガイド46とに沿うことから問題はないのであ
るが、給紙対象が腰の強い原稿である場合には、その腰
の強さで当該原稿が前記重送防止給紙手段41の下部戻し
ローラ41bに強く接して、この下部戻しローラ41bによる
強い戻し方向の搬送力を受けることで、原稿が給紙方向
の上流側に位置ずれしてしまい、前記搬送手段43による
給紙不良のために紙詰まりを生じる不都合があった。That is, when the document r to be fed is thin and has a weak stiffness, there is no problem because it bends and follows the cutout portion e of the upper sheet feed roller 41a and the upper sheet feed guide 46. However, if the object to be fed is a strong original, the original will make strong contact with the lower return roller 41b of the double feed prevention paper feeding means 41 due to the strength of the original, and the lower return roller 41b Due to the strong feeding force in the returning direction, the document is displaced to the upstream side in the paper feeding direction, and there is a problem that a paper jam occurs due to a paper feeding failure by the feeding means 43.

〔課題を解決するための手段〕[Means for Solving the Problems]

本考案による自動原稿搬送装置は、上記の実情に鑑みて
成されたものであって、前記重送防止給紙手段によって
給紙される原稿の先端を前記経路切り換え部材の下部遊
端側に向けて案内する可撓性のガイド部材を設けた点に
特徴を有する。The automatic document feeder according to the present invention has been made in view of the above circumstances, and directs the leading edge of the document fed by the double feed prevention sheet feeding means to the lower free end side of the path switching member. It is characterized in that a flexible guide member for guiding by means of is provided.

〔作用〕[Action]

上記の特徴構成によれば、給紙対象が薄手で腰の弱い原
稿の場合は、原稿自体が撓むことで当該原稿の先端が上
記ガイド部材に沿って給紙され、当該原稿の先端が前記
経路切り換え部材の下部遊端に向けて案内される。According to the above characteristic configuration, in the case of a thin document having a weak stiffness, the leading edge of the document is fed along the guide member due to the bending of the document itself, and the leading edge of the document is It is guided toward the lower free end of the path switching member.

而して、給紙対象が薄手で腰の弱い原稿であっても、当
該原稿の先端が直接的に経路切り換え部材の下部遊端に
当接されることで、前記経路切り換え部材が給紙方向下
流側に撓まされる。Thus, even if the object to be fed is a thin and weak original, the front end of the original directly comes into contact with the lower free end of the path switching member so that the path switching member moves in the paper feeding direction. Bent to the downstream side.

一方、給紙対象が厚手で腰の強い原稿である場合は、そ
の腰の強さで上記ガイド部材が撓まされることで、当該
原稿の先端が経路切り換え部材の基部側に給紙されるも
ので、上記ガイド部材の存しない状態と変わりのない給
紙が達成される。On the other hand, when the object to be fed is a thick and strong original, the leading end of the original is fed to the base side of the path switching member by bending the guide member with the strength of the original. Thus, the same sheet feeding as the state in which the guide member does not exist is achieved.

〔実施例〕〔Example〕

以下、本考案の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第１図は静電写真複写機の上部ハウジング１に装備した
自動原稿搬送装置Ａの概略を示し、第２図および第３図
は自動原稿搬送装置Ａの主要部を示すものであって、か
ゝる自動原稿搬送装置Ａは原稿給紙手段A₁と原稿押え手
段A₂から成り、この内の前記原稿給紙手段A₁は次のよう
に構成されている。FIG. 1 shows an outline of an automatic document feeder A installed in the upper housing 1 of the electrostatographic copying machine, and FIGS. 2 and 3 show the main parts of the automatic document feeder A. The automatic document feeder A comprises a document feeding means A ₁ and a document pressing means A ₂ , of which the document feeding means A ₁ is constructed as follows.

即ち、下流側の面部が下部側の給紙ガイド２を兼用構成
する原稿載置台３を、前記ハウジング１に装備されたコ
ンタクトガラス４の長手方向一側（図において左側）に
近接あるいは当接させた状態で前記ハウジング１に斜設
すると共に、該原稿台３の傾斜下方部分を覆うケース５
を前記ハウジング１に設け、かつ、上部側の給紙ガイド
６を前記下部側給紙ガイド２に相対応させて前記ケース
５の内部側に連設すると共に、この上下部の給紙ガイド
6,2間を通して原稿を給紙する重送防止給紙手段７と、
前記原稿台３に載置された原稿を前記重送防止給紙手段
７に向けて送り出す手段８を、夫々前記ケース５に内蔵
して成る。That is, the original placing table 3 whose downstream side surface portion also serves as the lower side paper feed guide 2 is brought close to or in contact with one side (left side in the figure) of the contact glass 4 mounted on the housing 1 in the longitudinal direction. Case 5 that is obliquely installed in the housing 1 in a closed state and covers the inclined lower part of the document table 3
Is provided in the housing 1, and the upper paper feed guide 6 is continuously provided inside the case 5 so as to correspond to the lower paper feed guide 2, and the upper and lower paper feed guides are provided.
Double feed prevention paper feed means 7 that feeds originals between 6 and 2,
Means 8 for feeding the originals placed on the original table 3 toward the double-feed preventing paper feeding means 7 are built in the case 5, respectively.

前記重送防止給紙手段７は、伝動ギヤ機構９を介して同
方向に回転される上下一対の駆動軸10,11を、前記上部
側給紙ガイド６の上方部と下部側給紙ガイド２の下方部
に位置させる状態で、一対の側板12,12にわたって架設
すると共に、周面の一部に切除部ａが形成された複数個
の上部給紙ローラ13を間隔を隔てて前記上部側駆動軸10
に設ける一方、当該上部給紙ローラ13間および両側のロ
ーラ13の外側の夫々に位置させる状態で前記下部側の駆
動軸11に下部戻しローラ14を設けて成るもので、前記上
部給紙ローラ13の切除部ａは、給紙停止下において前記
下部戻しローラ14に対応位置し、当該切除部ａと下部戻
しローラ14との間に通紙経路を形成している。The double feed prevention paper feeding means 7 includes a pair of upper and lower drive shafts 10 and 11 which are rotated in the same direction via a transmission gear mechanism 9 so that the upper portion of the upper paper feeding guide 6 and the lower paper feeding guide 2 In the state of being positioned at the lower part of the upper side of the pair of side plates 12, 12 and a plurality of upper paper feed rollers 13 having a cutout portion a formed in a part of the peripheral surface thereof are spaced apart from each other to drive the upper side. Axis 10
On the other hand, the lower return roller 14 is provided on the lower drive shaft 11 while being positioned between the upper paper feed rollers 13 and outside the rollers 13 on both sides. The cutout portion a is located at the position corresponding to the lower return roller 14 when the sheet feeding is stopped, and forms a sheet passing path between the cutout portion a and the lower return roller 14.

前記原稿送り出し手段８は、前記上部側駆動軸10に２本
のアーム15を枢着すると共に、該アーム15の遊端にわた
って支軸16を回転自在に設け、かつ、前記駆動軸10の回
転動力を前記支軸16に伝達する伝動機構17を当該駆動軸
10と支軸16とにわたって架設すると共に、この支軸16に
２個の送り出しローラ18を設けて成る。The document feeding means 8 has two arms 15 pivotally attached to the upper drive shaft 10, a pivot 16 provided rotatably over the free end of the arms 15, and rotational power of the drive shaft 10. The transmission mechanism 17 for transmitting the
The support shaft 16 is laid across the shaft 10 and the support shaft 16, and the support shaft 16 is provided with two feed rollers 18.

尚、前記アーム15基部側にカムフォロア19を設けると共
に、該カムフォロア19に作用する回転カム21を主駆動軸
20に設けて、主駆動軸20の回転に伴って前記アーム15を
揺動させるように構成してある。A cam follower 19 is provided on the base side of the arm 15 and a rotary cam 21 acting on the cam follower 19 is attached to the main drive shaft.
The arm 15 is provided so as to swing with the rotation of the main drive shaft 20.

次に、前記原稿押え手段A₂の具体構造について説明する
と、このものは、上部側に複写済み原稿の受け台22を備
え且つ下部側には原稿押え用の板部材23を備えた開閉枠
体24を、前記上部ハウジング１に装備されたコンタクト
ガラス４の一側縁近傍に沿う軸線Ｐまわりで開閉自在に
前記ハウジング１に枢着すると共に、該開閉枠体24の原
稿給紙手段A₁側の内部に、開閉枠体24を閉じた状態で前
記駆動軸10とほゞ平行になる正逆転駆動軸25を架設し、
この正逆転駆動軸25の中央部と両側部に夫々、巾広と巾
狭の例えば発泡ポリウレタン製の給排紙ローラ26（正逆
回転可能な搬送手段の一例）を設けると共に、当該給排
紙ローラ26に当接して従動回転するローラ27を配設して
ある。Next, the specific structure of the document pressing means A ₂ will be described. This is an opening / closing frame body having a tray 22 for the copied documents on the upper side and a plate member 23 for holding the document on the lower side. 24 is pivotally attached to the housing 1 so as to be openable and closable around an axis P along the vicinity of one side edge of the contact glass 4 mounted on the upper housing 1, and the opening / closing frame body 24 side of the document feeding means A ₁ side. Inside the, a forward / reverse drive shaft 25 is installed which is substantially parallel to the drive shaft 10 with the opening / closing frame 24 closed.
A wide and narrow sheet feeding / discharging roller 26 made of, for example, foamed polyurethane (an example of a conveying means capable of rotating in the forward and reverse directions) is provided at the center and both sides of the forward / reverse driving shaft 25, and the sheet feeding / discharging is performed. A roller 27 is provided which is in contact with the roller 26 and is driven to rotate.

尚、前記原稿押え用の板部材23としては、導電性の樹脂
板や、あるいは、導電性を有しない樹脂板であっても、
これのコンタクトガラス４側の面に導電性のシートを被
せたもの等が好適に使用され、搬送不良や斜め搬送を防
止できる点で好ましい。尚、受け台22、板部材23に代え
てエンドレスのベルトを設けてもよい。As the plate member 23 for pressing the document, a conductive resin plate or a resin plate having no conductivity,
A material in which a conductive sheet is covered on the surface of the contact glass 4 side is preferably used, and it is preferable in that it is possible to prevent defective conveyance and oblique conveyance. An endless belt may be provided instead of the pedestal 22 and the plate member 23.

一方、上記開閉枠体24の前記通紙経路に相対応する部位
に通紙口部ｂを形成すると共に、該通紙口部ｂから給排
紙ローラ26に至る給紙経路を横断させる状態で可撓性の
経路切り換え部材28を設けてある。On the other hand, in the state in which the sheet passing port b is formed in a portion of the opening / closing frame 24 corresponding to the sheet passing route and the sheet feeding route from the sheet passing port b to the sheet feeding / discharging roller 26 is crossed. A flexible path switching member 28 is provided.

この経路切り換え部材28は、合成樹脂製フィルムや金属
箔（好ましくは導電性を有するもの）などから成るもの
で、その上端部を前記通紙口部ｂの内方上部に設けた保
持部材29の傾斜面部に固着して、当該経路切り換え部材
28の下部遊端側を給紙方向下流側ほど下方に位置させる
と共に、その下部遊端を前記コンタクトガラス４の斜面
部4aに当接させて成る。The path switching member 28 is made of a synthetic resin film, a metal foil (preferably having conductivity), or the like, and has an upper end portion of a holding member 29 provided at the inner upper portion of the sheet passing port portion b. The route switching member is fixed to the inclined surface portion.
The lower free end side of 28 is positioned downward toward the downstream side in the sheet feeding direction, and the lower free end thereof is brought into contact with the inclined surface portion 4a of the contact glass 4.

上記構成の自動原稿搬送装置Ａによれば、前記原稿載置
台３に原稿を載置した状態でプリントスイッチを操作す
ると、前記主駆動軸20が回転してカム21による前記カム
フォロア19の拘束が解除され、前記アーム15が下降揺動
して送り出しローラ18が原稿上面を押圧する。According to the automatic document feeder A having the above structure, when the print switch is operated with the document placed on the document table 3, the main drive shaft 20 rotates and the cam 21 releases the constraint of the cam follower 19. Then, the arm 15 descends and swings, and the feed roller 18 presses the upper surface of the document.

そして、当該送り出しローラ18の回転に伴って前記原稿
載置台３上の原稿が前記重送防止給紙手段７に向けて送
り出されると共に、その原稿が２枚送りの状態であれば
下位の原稿が下部戻しローラ14によって戻し搬送され、
而して、最上位の１枚の原稿のみが前記重送防止給紙手
段７による給紙作用を受けて、当該原稿が前記上下部の
給紙ガイド6,2から経路切り換え部材28に向けて給紙さ
れ、かつ、当該原稿の先端が経路切り換え部材28に当接
して押圧することで、該経路切り換え部材28の下部遊端
が給紙方向下流側に撓み変形し通紙が許容されること
で、前記原稿の先端が給排紙ローラ26とコンタクトガラ
ス４との間に送り込まれる。Then, as the feed roller 18 rotates, the document on the document table 3 is fed toward the multi-feed preventing sheet feeding means 7, and if the document is fed two sheets, the lower document is Returned and conveyed by the lower return roller 14,
Thus, only the uppermost one original sheet is subjected to the paper feeding action by the double feed preventing paper feeding means 7, and the original document is directed from the upper and lower paper feeding guides 6 and 2 toward the path switching member 28. When the paper is fed and the leading edge of the original comes into contact with and presses the path switching member 28, the lower free end of the path switching member 28 is flexed and deformed downstream in the paper feeding direction, and paper passing is allowed. Then, the leading edge of the original is fed between the paper feed / discharge roller 26 and the contact glass 4.

そして、所定のタイミングで前記送り出しローラ18が上
昇し且つ上部給紙ローラ13の回転が停止されて、当該上
部給紙ローラ13の切除部ａと戻し方向に回転している下
部戻しローラ14との間に通紙経路が形成されると共に、
前記給排紙ローラ26が正回転（図において反時計廻り方
向）することによって、前記原稿が通紙経路から前記経
路切り換え部材28の下部遊端を潜り抜けながら、前記コ
ンタクトガラス４上の所定位置に搬送され、かつ、当該
原稿の画像に対する所定の走査終了後に前記給排紙ロー
ラ26が逆回転することで該原稿が戻し搬送される。Then, at a predetermined timing, the delivery roller 18 rises and the rotation of the upper paper feed roller 13 is stopped, so that the cutout portion a of the upper paper feed roller 13 and the lower return roller 14 rotating in the return direction are separated. A paper passage is formed between them,
When the paper feed / discharge roller 26 rotates forward (counterclockwise in the figure), the document passes through the paper passage through the lower free end of the path switching member 28, and at a predetermined position on the contact glass 4. The document is returned and conveyed by being reversely rotated by the paper feeding / discharging roller 26 after the predetermined scanning of the image of the document is completed.

この戻し搬送される複写済みの原稿は、前記経路切り換
え部材28によって重送防止給紙手段７側への通紙が阻止
され且つ給排紙ローラ26の上方に案内される。即ち、前
記コンタクトガラス４上に搬送された原稿が経路切り換
え部材28によってスイッチバック搬送されるものであ
り、この原稿が前記給排紙ローラ26と従動ローラ27との
間に送り込まれて、ここから開閉枠体24に形成された受
け台22に排紙される。The copied original document which is conveyed back is prevented from passing to the double feed prevention paper feed means 7 side by the path switching member 28 and is guided above the paper feed / discharge roller 26. That is, the original conveyed on the contact glass 4 is switch-back conveyed by the path switching member 28, and the original is fed between the paper feeding / discharging roller 26 and the driven roller 27, and from there. The paper is ejected to the receiving tray 22 formed on the open / close frame 24.

以上の構成ならびに給排紙の制御は、本出願人が実願昭
63-61333号をもって既に提案している自動原稿搬送装置
そのものであり、より具体的な構成ならびに給排紙の制
御については上記実願昭63-61333号が参照される。The above configuration and control of paper feeding / discharging are performed by the applicant.
This is the automatic document feeder itself already proposed in 63-61333, and the above-mentioned Japanese Patent Application No. 63-61333 is referred to for the more specific structure and control of paper feeding and discharging.

上記構成の自動原稿搬送装置Ａにおいては、前記重送防
止給紙手段７によって給紙される原稿が薄手で腰の弱い
ものの場合に、前記経路切り換え部材28を給紙方向の下
流側に撓み変形させ得ないで、通紙が不能になることか
ら紙詰まりを生じることは既述した通りであり、かゝる
不都合を解消するために、前記重送防止給紙手段７によ
って給紙される原稿の先端を前記経路切り換え部材28の
下部遊端側に向けて案内する可撓性のガイド部材30を、
前記上部側の給紙ガイド６のほゞ全巾にわたって前記上
部給紙ローラ13の下流側から前記上部側の給紙ガイド６
の終端部に設けたのである。In the automatic document feeder A having the above-mentioned structure, when the document fed by the double-feed preventing sheet feeding means 7 is thin and weak, the path switching member 28 is bent and deformed downstream in the sheet feeding direction. As described above, paper jams occur due to the impossibility of paper passing, and in order to eliminate such inconvenience, the documents fed by the double feed prevention paper feeding means 7 are A flexible guide member (30) for guiding the tip of the guide member toward the lower free end side of the path switching member (28),
The paper feeding guide 6 on the upper side from the downstream side of the upper paper feeding roller 13 over the entire width of the paper feeding guide 6 on the upper side.
It was provided at the end of the.

より詳しくは、前記上部側の給紙ガイド６に対して前記
上部給紙ローラ13の直下流側の部位に舌片ｃを切り起こ
すと共に、前記上部側の給紙ガイド６の終端部に上方へ
の屈曲板部ｄを連設する一方、前記可撓性のガイド部材
30をシート状の合成樹脂製フィルムや金属箔（好ましく
は導電性を有するもの）などとして、このガイド部材30
を前記下部側給紙ガイド２に向けて湾曲させた状態で、
当該ガイド部材30を貼着等の手段で前記舌片ｃと屈曲板
部ｄとにわたって設けたのである。More specifically, the tongue piece c is cut and raised at a position immediately downstream of the upper sheet feeding roller 13 with respect to the upper sheet feeding guide 6, and is moved upward to the end portion of the upper sheet feeding guide 6. The flexible guide member is provided while the bent plate portions d are continuously provided.
The guide member 30 is formed by using 30 as a sheet-shaped synthetic resin film or metal foil (preferably having conductivity).
In a state where it is curved toward the lower side paper feed guide 2,
The guide member 30 is provided over the tongue piece c and the bent plate portion d by means such as attachment.

かゝる構成によれば、第４図に示すように、前記重送防
止給紙手段７による給紙対象が薄手で腰の弱い原稿r₁の
場合は、該原稿自体が撓むことで当該原稿r₁の先端が前
記ガイド部材30に沿って給紙され、該原稿r₁の先端が前
記経路切り換え部材28の下部遊端に向けて案内されて、
原稿r₁の先端が直接的に経路切り換え部材28の下部遊端
に当接することで、前記経路切り換え部材28が給紙方向
下流側に撓まされ、当該経路切り換え部材28に対する原
稿r₁の通紙が可能になって紙詰まりの発生が防止され
る。According to such a configuration, as shown in FIG. 4, when the object to be fed by the double feed prevention sheet feeding means 7 is a thin and weak original r ₁ , the original is bent and The leading edge of the original document r ₁ is fed along the guide member 30, and the leading edge of the original document r ₁ is guided toward the lower free end of the path switching member 28,
When the leading edge of the original document r ₁ directly contacts the lower free end of the path switching member 28, the path switching member 28 is bent to the downstream side in the sheet feeding direction, and the original document r ₁ passes through the path switching member 28. Paper is enabled and paper jams are prevented.

一方、給紙対象が厚手で腰の強い原稿r₂の場合は、第５
図に示すように、前記重送防止給紙手段７によって供給
される原稿r₂の先端が前記ガイド部材30に当接した際
に、当該原稿自体の腰の強さでガイド部材30が撓まされ
て、該原稿r₂の先端が前記経路切り換え部材28の基部側
に給紙されると共に、当該経路切り換え部材28が前記腰
の強い原稿先端の当接によって給紙方向の下流側に撓ま
されることから、経路切り換え部材28に対する原稿r₂の
通紙が行われ、かつ、かゝる状態において、前記原稿r₂
が重送防止給紙手段７の下部戻しローラ14に強く接する
ことがなく、従って、前記原稿r₂が下部戻しローラ14に
よる戻し方向の強い搬送力を受けることがないことか
ら、原稿r₂が給紙方向の上流側に位置ずれすることによ
る紙詰まりの発生が防止される。On the other hand, if the document to be fed is thick and strong original r ₂ ,
As shown in the figure, when the leading edge of the original document r ₂ supplied by the double-feed preventing sheet feeding means 7 contacts the guide member 30, the guide member 30 is bent by the rigidity of the original document itself. Then, the leading edge of the original document r ₂ is fed to the base side of the path switching member 28, and the route switching member 28 is bent toward the downstream side in the paper feeding direction due to the abutting of the rigid document leading edge. Therefore, the original document r ₂ is passed through the path switching member 28, and in such a state, the original document r ₂ is passed.
Does not come into strong contact with the lower return roller 14 of the double feed prevention paper feeding means 7, and therefore the original r ₂ is not subjected to a strong conveying force in the returning direction by the lower return roller 14, the original r ₂ It is possible to prevent the occurrence of a paper jam due to the misalignment on the upstream side in the paper feeding direction.

尚、前記ガイド部材30の両側を、貼着等の手段で前記舌
片ｃと屈曲板部ｄとに固着させる構成としているが、前
記屈曲板部ｄとこれに対するガイド部材30の固着を省略
し、前記ガイド部材30の給紙方向下流側をフリーの状態
にして実施するもよい。Although the both sides of the guide member 30 are fixed to the tongue piece c and the bent plate portion d by means such as sticking, the bent plate portion d and the guide member 30 are not fixed to the bent plate portion d. Alternatively, the downstream side of the guide member 30 in the sheet feeding direction may be free.

また、前記ガイド部材30をシート状のものとしている
が、巾狭の帯状部材や線状部材等に変更可能である。Further, although the guide member 30 has a sheet shape, it can be changed to a narrow band-shaped member, a linear member, or the like.

〔考案の効果〕[Effect of device]

以上説明したように本考案の自動原稿搬送装置によれ
ば、原稿を経路切り換え部材の下部遊端側に案内させる
可撓性のガイド部材を設けたことで、給紙対象が薄手で
腰の弱い原稿であっても当該原稿の先端で経路切り換え
部材を給紙方向の下流側に確実に撓ませ得ることから、
経路切り換え部材の上流側での紙詰まりの発生を効果的
に防止できるようになった。As described above, according to the automatic document feeder of the present invention, by providing the flexible guide member for guiding the document to the lower free end side of the path switching member, the feeding target is thin and the waist is weak. Even for a document, the path switching member can be surely bent at the leading edge of the document to the downstream side in the paper feeding direction.
It has become possible to effectively prevent the occurrence of paper jam on the upstream side of the path switching member.

あるいは、給紙対象が厚手で腰の強い原稿の場合は、そ
れ自体の腰の強さで前記ガイド部材が撓まされること
で、当該ガイド部材が存しない状態と変わりのない給紙
が行われるもので、下部戻しローラによる原稿の給紙方
向上流側への位置ずれに起因する紙詰まりの発生も効果
的に防止できる。Alternatively, when the document to be fed is a thick and strong original, the guide member is bent by the stiffness of the original document, so that the same paper feeding as that in the absence of the guide member is performed. Therefore, it is possible to effectively prevent the occurrence of paper jam due to the displacement of the original to the upstream side in the paper feeding direction by the lower return roller.

【図面の簡単な説明】[Brief description of drawings]

第１図は自動原稿搬送装置の縦断側面図、第２図は自動
原稿搬送装置の要部の断面図、第３図は自動原稿搬送装
置の斜視図、第４図は薄手原稿の通紙状態を示す説明図
であり、第５図は厚手の原稿の通紙状態を示す説明図で
ある。 そして、第６図は本出願人が提案している自動原稿搬送
装置の要部の断面図である。 ４……コンタクトガラス、７……重送防止給紙手段、13
……上部給紙ローラ、14……下部戻しローラ、22……受
け台、26……搬送手段、28……経路切り換え部材、30…
…ガイド部材、ａ……切除部。FIG. 1 is a vertical side view of the automatic document feeder, FIG. 2 is a sectional view of a main part of the automatic document feeder, FIG. 3 is a perspective view of the automatic document feeder, and FIG. FIG. 5 is an explanatory diagram showing a state of passing a thick original document. FIG. 6 is a sectional view of the essential part of the automatic document feeder proposed by the present applicant. 4 ... Contact glass, 7 ... Double-feed preventive paper feeding means, 13
...... Upper paper feed roller, 14 ...... Lower return roller, 22 …… Cage, 26 …… Conveying means, 28 …… Path switching member, 30 ・ ・ ・
… Guide member, a… Excision part.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭60−191960（ＪＰ，Ａ) 特開 昭62−12563（ＪＰ，Ａ) 実開 昭60−90239（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-191960 (JP, A) JP-A-62-12563 (JP, A) Practical application Sho-60-90239 (JP, U)

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】周面の一部に切除部が形成された複数個の
上部給紙ローラと当該ローラ間に位置する下部戻しロー
ラから成る重送防止給紙手段を、給紙停止下において前
記切除部と下部戻しローラとの間に通紙経路が形成され
るように配設し、該重送防止給紙手段の下流側に、正逆
回転可能に搬送手段を設けると共に、下部遊端の給紙方
向下流側への撓み変形によって前記搬送手段側への通紙
のみを許容し且つ該搬送手段によって戻し搬送される原
稿を当該搬送手段の上方に向けて案内する可撓性の経路
切り換え部材を、前記重送防止給紙手段から搬送手段へ
の給紙経路を横断させて斜設した自動原稿搬送装置であ
って、前記重送防止給紙手段によって給紙される原稿の
先端を前記経路切り換え部材の下部遊端側に向けて案内
する可撓性のガイド部材を設けてあることを特徴とする
自動原稿搬送装置。1. A multi-feed preventing sheet feeding means comprising a plurality of upper sheet feeding rollers having cutouts formed on a part of a peripheral surface thereof and a lower return roller located between the rollers, said sheet feeding means being provided with the sheet feeding stopped. It is arranged so that a sheet passing path is formed between the cutting section and the lower return roller, and a conveying means is provided rotatably in the forward and reverse directions on the downstream side of the double feed prevention sheet feeding means, and the lower free end A flexible path switching member which allows only the passage of the sheet to the conveying means side by the bending deformation to the downstream side in the sheet feeding direction and guides the document returned and conveyed by the conveying means toward above the conveying means. Is an automatic document feeder obliquely provided across the sheet feeding path from the double feed preventing sheet feeding means to the conveying means, wherein the leading edge of the document fed by the double feeding preventing sheet feeding means is set to the path. A flexible guide that guides the lower free end of the switching member. An automatic document feeder, characterized in that is provided with a member.