JP5760329B2 - Sheet feeding device - Google Patents

Sheet feeding device Download PDF

Info

Publication number
JP5760329B2
JP5760329B2 JP2010111044A JP2010111044A JP5760329B2 JP 5760329 B2 JP5760329 B2 JP 5760329B2 JP 2010111044 A JP2010111044 A JP 2010111044A JP 2010111044 A JP2010111044 A JP 2010111044A JP 5760329 B2 JP5760329 B2 JP 5760329B2
Authority
JP
Japan
Prior art keywords
separation
sheet feeding
separation holder
holder
elastic member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2010111044A
Other languages
Japanese (ja)
Other versions
JP2011236042A (en
Inventor
森崎良平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP2010111044A priority Critical patent/JP5760329B2/en
Publication of JP2011236042A publication Critical patent/JP2011236042A/en
Application granted granted Critical
Publication of JP5760329B2 publication Critical patent/JP5760329B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Sheets, Magazines, And Separation Thereof (AREA)

Description

本発明は、堆積載置されたシート束から1枚ずつ分離して給送するシート給送装置に関するものである。   The present invention relates to a sheet feeding apparatus that separates and feeds a stack of stacked sheets one by one.

従来、各種画像形成装置の給紙部や原稿読取装置の給紙部には転写紙や原稿を1枚ずつ分離して送り出すシート給送装置が用いられている。かかるシート給送装置として、シートを給送する方向に回転する給送回転体と、該給送回転体に当接してニップを形成する摩擦部材を支持する分離ホルダと、該分離ホルダが回転可能、且つ着脱可能に装着される保持枠体と、前記分離ホルダを介して前記摩擦部材を前記給送回転体へ当接する方向へ押圧する弾性部材とを有するものが知られている。   2. Description of the Related Art Conventionally, a sheet feeding device that separates and feeds transfer sheets and documents one by one is used for a paper feeding unit of various image forming apparatuses and a paper feeding unit of a document reading device. As such a sheet feeding device, a feeding rotating body that rotates in a sheet feeding direction, a separation holder that supports a friction member that forms a nip in contact with the feeding rotating body, and the separation holder is rotatable. In addition, there is known one having a holding frame body that is detachably mounted and an elastic member that presses the friction member in a direction in which the friction member abuts against the feeding rotating body via the separation holder.

この種のシート給送装置では、経時使用により摩擦部材である分離パッドが磨耗すると重送が多発するため、分離パッドを交換しなければならない。分離パッドの交換は、通常サービスマン等の専門家によって行われているが、これは分離パッドを正しい位置や姿勢に配置することがかなり難しく、分離パッドに位置ずれ等を生ずると良好な分離性が確保できなくなる。そこで、分離パッドの交換を一般ユーザーでも簡単に行えるようにした装置が特許文献1及び2等に記載されている。   In this type of sheet feeding apparatus, if the separation pad, which is a friction member, is worn due to use over time, multiple feeding occurs frequently, so the separation pad must be replaced. The replacement of the separation pad is usually performed by an expert such as a service person. However, it is quite difficult to place the separation pad in the correct position and posture, and good separation performance is obtained if the separation pad is displaced. Cannot be secured. In view of this, Patent Documents 1 and 2 describe an apparatus that allows a general user to easily replace a separation pad.

特許文献1には、分離パッドと分離加圧バネとを一体に保持する保持部材を装置本体に着脱可能に取り付け、分離パッドを交換する際には装置本体から保持部材を取り出した後、保持部材から分離パッドを取り外すようにしたシート給送装置が開示されている。また、特許文献2にはシート搬送回転部材側から開口部への分離ユニットの挿入を案内する挿入ガイドと、該挿入ガイドに案内されて該開口部に挿入される該分離ユニットに設けられた被規制部を規制して、該分離ユニットを該開口部内の収められるべき位置に位置させる位置規制部と、を該開口部の縁領域に設けることにより、該分離ユニットをシート搬送回転部材側から着脱させることができるシート給送装置が開示されている。   In Patent Document 1, a holding member that integrally holds the separation pad and the separation pressure spring is detachably attached to the apparatus main body, and when replacing the separation pad, the holding member is taken out from the apparatus main body, A sheet feeding apparatus is disclosed in which a separation pad is removed from the sheet feeding device. Patent Document 2 discloses an insertion guide for guiding the insertion of the separation unit into the opening from the sheet conveying rotation member side, and a cover provided in the separation unit that is guided by the insertion guide and inserted into the opening. The separation unit is attached to and detached from the sheet conveying rotation member side by providing a position restriction part that restricts the restriction part and positions the separation unit at a position where the separation unit should be accommodated in the opening. A sheet feeding device that can be made to be disclosed is disclosed.

しかしながら、特許文献1では分離パッドの交換のために分離ユニット保持部まで取り外す必要があるため、特許文献2と比べると交換の作業に余計な手間が掛かかってしまう。さらに、分離ユニットと分離ユニット保持部の固定が支持軸と穴で行われているため、交換作業に慣れていない人間が交換を行う場合に支持軸を折ってしまう危険性がある点が挙げられる。また、特許文献2の場合には、分離パッドをシート搬送回転部材に押し当てるためのバネの交換が容易に行えないため、バネ交換時や分離パッド交換時にバネが外れてしまった場合に余計な分解作業を行う必要があるという問題がある。   However, in Patent Document 1, it is necessary to remove even the separation unit holding portion for replacement of the separation pad, so that compared to Patent Document 2, extra work is required for the replacement work. Furthermore, since the separation unit and the separation unit holding portion are fixed by the support shaft and the hole, there is a risk that the support shaft may be broken when a person who is not used to the replacement work performs the replacement. . Further, in the case of Patent Document 2, since the spring for pressing the separation pad against the sheet conveying rotation member cannot be easily replaced, it is unnecessary when the spring is removed at the time of spring replacement or separation pad replacement. There is a problem that it is necessary to perform disassembly work.

本発明は、上記した従来の問題点に鑑み、分離ユニットの摩擦部材を簡単な作業で交換することができるシート給送装置を提供することを目的としている。   In view of the above-described conventional problems, an object of the present invention is to provide a sheet feeding apparatus that can replace the friction member of the separation unit with a simple operation.

上記課題を解決するため、本発明は、シートを給送する方向に回転する給送回転体と、該給送回転体に当接してニップを形成する摩擦部材を支持する分離ホルダと、該分離ホルダが回転可能、且つ着脱可能に装着される保持枠体と、前記分離ホルダを介して前記摩擦部材を前記給送回転体へ当接する方向へ押圧する弾性部材とを有するシート給送装置において、前記分離ホルダの回転を前記弾性部材の押圧力に抗して規制する規制手段と、前記弾性部材の一端を受ける受け部を備え、前記受け部は、前記弾性部材の一端が導かれる窪み部を有し、前記弾性部材の他端は、前記窪み部の外で前記分離ホルダを押圧し、前記規制手段は、前記分離ホルダに形成された凸部と、該凸部の回転軌跡内で前記保持枠体に設けられ、且つ窪み部の外に位置する凸形状のストッパとで構成されることを特徴とするシート給送装置を提案する。 In order to solve the above-described problems, the present invention provides a feeding rotating body that rotates in a sheet feeding direction, a separation holder that supports a friction member that forms a nip in contact with the feeding rotating body, and the separation In a sheet feeding apparatus comprising: a holding frame that is rotatably and detachably mounted on a holder; and an elastic member that presses the friction member in a direction to contact the feeding rotating body via the separation holder. and regulating means for regulating against the rotation of the separation holder the pressing force of the elastic member, and a receiving portion for receiving one end of said elastic member, wherein the receiving portion is recessed portion to which one end of the elastic member is guided The other end of the elastic member presses the separation holder outside the recess , and the restricting means includes a protrusion formed on the separation holder and the rotation locus of the protrusion Provided on the holding frame and positioned outside the recess It proposes a sheet feeding apparatus, characterized in that composed of the stopper convex shape.

なお、本発明は、前記分離ホルダは前記保持枠体に対してある角度に位置させると着脱が可能になる。その着脱を可能にする保持枠体からの角度をθ1、前記摩擦部材が前記給送回転体に当接する保持枠体からの角度をθ2、前記規制手段が規制する保持枠体からの角度をθとすると、θ2<θ<θ1に設定されていると有利である。 The present invention is the separation holder detachably can be ing and is positioned at an angle with respect to the holding frame. The angle from the holding frame body that enables the attachment / detachment is θ1, the angle from the holding frame body where the friction member abuts on the feeding rotating body is θ2, and the angle from the holding frame body that the regulating means regulates is θ. Then, it is advantageous that θ2 <θ <θ1 is set.

さらに、本発明は、前記規制手段が前記分離ホルダに形成された凸部と、該凸部の回転軌跡内で前記保持枠体に設けられたストッパとで構成されると有利である。   Further, according to the present invention, it is advantageous that the restricting means is composed of a convex portion formed on the separation holder and a stopper provided on the holding frame body within the rotation locus of the convex portion.

さらにまた、本発明は、前記分離ホルダが前記弾性部材の弾性力よりも大きいある力以上を加えることによって前記凸部が前記ストッパを乗り越えると有利である。 Still further, according to the present invention, it is advantageous that the protruding portion gets over the stopper when the separation holder applies a force greater than a certain elastic force of the elastic member.

本発明によれば、摩擦部材の交換作業が簡単になり、交換時に摩擦部材の交換で分離ホルダから給送回転体を離したときに分離ホルダが弾性部材の作用により分離ホルダが飛ばされることが防止される。さらに、弾性部材の設置や設定も容易であるので、摩擦部材の交換作業を誰でも行うことが可能となる。   According to the present invention, the replacement work of the friction member is simplified, and the separation holder is blown off by the action of the elastic member when the feed rotating body is separated from the separation holder by replacement of the friction member at the time of replacement. Is prevented. Furthermore, since the installation and setting of the elastic member is easy, anyone can replace the friction member.

本発明に係るシート給送装置を用いた自動原稿搬送装置を示す全体概略図である。1 is an overall schematic diagram showing an automatic document feeder using a sheet feeding device according to the present invention. 本発明に係るシート給送装置の分離ユニットを示す斜視図である。FIG. 6 is a perspective view showing a separation unit of the sheet feeding apparatus according to the present invention. 分離ユニット図2と異なる方向から見た斜視図である。Is a perspective view of the separation unit from different directions Figure 2. 分離ユニットを給送回転体に押圧する、弾性部材の取り付け方法を示す斜視図である。It is a perspective view which shows the attachment method of the elastic member which presses a separation unit to a feed rotary body. (a)、(b)、(c)は図4の弾性部材の他端を受ける受け部の上図、側面図、断面図である。(A), (b), (c) is the upper view of the receiving part which receives the other end of the elastic member of FIG. 4, a side view, and sectional drawing. 分離ホルダの回転を弾性部材の押圧力から基台部の凸部と分離ホルダの凸部の干渉にて規制する規制手段を示す図である。It is a figure which shows the control means which controls rotation of a separation holder by interference of the convex part of a base part, and the convex part of a separation holder from the pressing force of an elastic member. (a)、(b)、(c)、(d)は分離ユニットを基台部へと組み付ける組み付け方法を示す図である。(A), (b), (c), (d) is a figure which shows the assembly | attachment method of assembling | attaching a separation unit to a base part. 分離ユニットの保持枠体への取り付け状態と角度を示す図である。It is a figure which shows the attachment state and angle to the holding | maintenance frame of a separation unit. 分離ホルダの回転を弾性部材の押圧力から分離ホルダの軸と基台部側の軸受内の凸部の干渉にて規制する規制手段を示す図である。It is a figure which shows the regulation means which regulates rotation of a separation holder by the interference of the axis | shaft of a separation holder, and the convex part in the bearing by the side of a base part from the pressing force of an elastic member. (a)、(b)は分離ホルダの回転を弾性部材の押圧力から分離ホルダに取り付けた摩擦部と基台部の干渉にて規制する規制手段を示す図である。(A), (b) is a figure which shows the control means which controls rotation of a separation holder by interference of the friction part and base part which were attached to the separation holder from the pressing force of the elastic member. (a)、(b)は分離ホルダの回転を弾性部材の押圧力から分離ホルダと基台部に取り付けた摩擦部の干渉にて規制する規制手段を示す図である。(A), (b) is a figure which shows the regulation means which regulates rotation of a separation holder by interference of the friction part attached to the separation holder and the base part from the pressing force of an elastic member.

以下、本発明の実施形態を添付図面に従って説明する。
図1は、本発明に係るシート給送装置を設置した原稿読取装置を示す全体概略図である。
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an overall schematic view showing a document reading apparatus provided with a sheet feeding apparatus according to the present invention.

図1において、原稿読取装置1は、原稿トレイ2に積載された原稿束をピックアップローラ3によりシート給送装置である分離ユニット4と分離ローラ5間に搬送する。次に分離ユニット4と分離ローラ5間の分離ニップではピックアップローラ3に呼び出された原稿に対して最上位の原稿のみを給送するように分離作用を与えている。そして、分離ニップにより1枚に分離された最上位の原稿は分離ローラ5の回転によりプルアウトローラ6aとその従動ローラ6b間へ搬送されてプルアウトローラ6に挟持される。プルアウトローラ6の搬送速度は分離ローラ5の搬送速度よりも大きく設定されているが、分離ローラ5にはトルクリミッター(図示せず)が取り付けられている。そのため、原稿がプルアウトローラ6に到達した後はプルアウトローラ6の搬送速度で連れ回り動作を行えるようになっている。 In FIG. 1, a document reading apparatus 1 conveys a bundle of documents stacked on a document tray 2 between a separation unit 4 that is a sheet feeding device and a separation roller 5 by a pickup roller 3 . Then the separation nip between the separation unit 4 the separation roller 5, have given separating action to feed only the uppermost document to the document called the pickup roller 3. The top of the original document separated one by separation nip is conveyed to between the pullout roller 6a and the driven roller 6b by the rotation of the separation roller 5 is held to the pull-out roller 6. Although the conveyance speed of the pull-out roller 6 is set to be higher than the conveyance speed of the separation roller 5, a torque limiter (not shown) is attached to the separation roller 5 . For this reason, after the original reaches the pull-out roller 6, the accompanying operation can be performed at the conveyance speed of the pull-out roller 6.

プルアウトローラ6に到達した原稿は、搬送経路に沿って読取前ローラ7aとその従動ローラ7b間を経由して背景板8と画像読取装置9間の画像読取部に搬送され画像の読み取りが行われる。片面読込みの場合、画像読取部を抜けた原稿は排紙ローラ10aとその従動ローラ10bを経由し排紙トレイ13へ送り出される。両面読み取りの場合は、分岐爪11が動き、排紙ローラ10aとその従動ローラ10b間から反転ローラ12aとその従動ローラ12bへ原稿が搬送される。その後は排紙ローラ10aと、その従動ローラ10c間を経由し読取前ローラ7まで搬送され片面読み取り時と同様に画像の読み取りが行われる。しかし、裏面の画像の読取り後にそのまま原稿を排紙トレイ13に送り出してしまうと原稿の表裏のセット方向が原稿トレイ2上にセットした時と逆になってしまうため、再度両面読取り時に搬送した経路を通してから原稿を排紙トレイ13に送り出す。 The document that has reached the pull-out roller 6 is conveyed along the conveyance path to the image reading unit between the background plate 8 and the image reading device 9 via the pre-reading roller 7a and the driven roller 7b , and the image is read. Is called. In the case of single-sided reading, the original that has passed through the image reading unit is sent to the paper discharge tray 13 via the paper discharge roller 10a and its driven roller 10b. For double-sided reading, branching pawl 11 moves, the document from between the discharge roller 10a and the follower roller 10b to the reversing roller 12a and the follower roller 12b is Ru is conveyed. Thereafter, the sheet is conveyed to the pre-reading roller 7 via the sheet discharge roller 10a and the driven roller 10c, and an image is read in the same manner as in single-sided reading. However, if the original is sent out to the paper discharge tray 13 as it is after the back side image is read, the setting direction of the front and back of the original is opposite to that when the original is set on the original tray 2, and therefore the path transported at the time of double-side reading again Then, the original is sent out to the paper discharge tray 13.

図2及び図3は、シート給送装置の分離ユニット4を示す前方斜視図及び後方斜視図である。
図2及び図3において、本例の分離ユニット4は装置本体の機枠等に一体若しくは固定された基台部40と、分離パッド42としての摩擦部材が貼着等によって取り付けられる分離ホルダ41とを有している。また、分離ユニット4は該分離ホルダ41を分離ローラ5(図1に示す)に向けて押圧する押圧バネ43としての弾性部材とを有している。分離ホルダ41基台部40に回転可能、かつ着脱可能に装着するため、基台部40に切り欠き部45が形成された軸受44が設けられている。この軸受44は、本例の場合、基台部40の一端側で、かつ、左右に分けて設けられており、その切り欠き部45は軸受44の頂部で、切り欠き方向が分離ホルダ41の回転支点の軸線方向に形成されている。他方、分離ホルダ41の一端側には連結部46aによって一体的に連結された軸46が設けられ、軸46はその断面形状がトラック形状(小判状)に形成されている。そして、軸46はトラック形状の短方向の幅が上記切り欠き部45の幅より僅かに小さい幅に設定され、トラック形状の長手方向の幅は軸受44の内周壁に摺接するように、その内径とほぼ一致するように設定されている。この分離ホルダ41の全体形状は円弧状の湾曲し、その湾曲凸面側には分離パッド42が貼着等によって取り付けられている。なお、基台部40と分離ホルダ41はそれぞれプラスチック樹脂から作られている。
2 and 3 are a front perspective view and a rear perspective view showing the separation unit 4 of the sheet feeding apparatus.
2 and 3, the separation unit 4 of this example includes a base 40 integrally or fixed to a machine frame of the apparatus main body, and a separation holder 41 to which a friction member as a separation pad 42 is attached by sticking or the like. have. Further, the separation unit 4 includes an elastic member as a pressing spring 43 that presses the separation holder 41 toward the separation roller 5 (shown in FIG. 1). In order to attach the separation holder 41 to the base part 40 in a rotatable and detachable manner, a bearing 44 having a notch 45 formed in the base part 40 is provided. In the case of this example, the bearing 44 is provided on one end side of the base portion 40 and separately on the left and right sides. The notch portion 45 is the top portion of the bearing 44 and the notch direction is the separation holder 41 . It is formed in the axial direction of the rotation fulcrum. On the other hand, the shaft 46 integrally connected by the connection part 46a is provided in the one end side of the separation holder 41, The cross-sectional shape of the shaft 46 is formed in the track shape (oval shape). The shaft 46 is set so that the short width of the track shape is set slightly smaller than the width of the notch 45, and the long width of the track shape is slidably in contact with the inner peripheral wall of the bearing 44. Is set to almost match. The entire shape of the separation holder 41 is curved in an arc shape, and a separation pad 42 is attached to the curved convex surface side by sticking or the like. The base part 40 and the separation holder 41 are each made of plastic resin.

また、上記押圧バネ43は分離ホルダ41と基台部40の間に配置されるが、組み付け方法はその一端を図4に示すように、分離ホルダ41の湾曲面の裏面側に形成された円筒状の突起47に嵌め込む。このとき、分離ホルダ41の突起47の直径に対して内径がやや小さい、例えば0.1mm程度小さい押圧バネ43を用いることで、押圧バネ43を突起47に押し込むと、挿入したバネ自身の締め付け力でバネが分離ホルダ41に保持される。なお、押圧バネ43はコイルバネで、一端を突起47に嵌め込んで図4に示すように、自由端である他端を上方に位置させても、自重でその姿勢が崩れる(軸線が曲がる)ことが殆んどない程度の弾性力を有している。   Further, the pressing spring 43 is disposed between the separation holder 41 and the base portion 40, and the assembly method is a cylinder formed at one end on the back side of the curved surface of the separation holder 41 as shown in FIG. It fits in the protrusion 47 of a shape. At this time, when the pressing spring 43 is pushed into the protrusion 47 by using the pressing spring 43 having an inner diameter slightly smaller than the diameter of the protrusion 47 of the separation holder 41, for example, about 0.1 mm, the tightening force of the inserted spring itself Thus, the spring is held by the separation holder 41. Note that the pressing spring 43 is a coil spring, and even if one end is fitted into the protrusion 47 and the other end, which is a free end, is positioned upward as shown in FIG. 4, the posture is broken by its own weight (the axis is bent). Has almost no elastic force.

一方、基台部40には押圧バネ43の他端を受ける受け部48が設けられている。本例の受け部48は、図5に示すように、その中央に押圧バネ43の直径とほぼ等しい直径の円形の窪み部49が形成され、この窪み部49に押圧バネ43を導くすり鉢案内部50が設けられている。このすり鉢案内部50は、窪み部49の全周に設ける必要がなく、後述するように分離ホルダ41を基台部40に装着した際に押圧バネ43の他端が接し易い軸受44から遠い側の半円分に設けられている。   On the other hand, the base portion 40 is provided with a receiving portion 48 that receives the other end of the pressing spring 43. As shown in FIG. 5, the receiving portion 48 of this example is formed with a circular hollow portion 49 having a diameter substantially equal to the diameter of the pressing spring 43 at the center thereof, and a mortar guide portion that guides the pressing spring 43 to the hollow portion 49. 50 is provided. The mortar guide portion 50 does not need to be provided on the entire circumference of the recess portion 49, and the side farther from the bearing 44 where the other end of the pressing spring 43 is easily contacted when the separation holder 41 is mounted on the base portion 40 as will be described later. It is provided for the semicircle.

分離ユニット4には押圧バネ43の押圧力に抗して分離ホルダ41が回転する動きを規制する規制手段が設けられている。図2、図3及び図6に示す実施形態では規制手段が基台部40上に設けられた凸形状のストッパ51と、分離ホルダ41に設けられた凸部52とで構成されている。分離ホルダ41の凸部52は、左右の軸46の間である連結軸部44aに設けられ、ストッパ51に当る作用面は軸線と直交する平面に形成され、その反対面は徐々に厚みを増すような曲面に形成されている。   The separation unit 4 is provided with restriction means for restricting the movement of the separation holder 41 against the pressing force of the pressing spring 43. In the embodiment shown in FIG. 2, FIG. 3 and FIG. 6, the restricting means is composed of a convex stopper 51 provided on the base part 40 and a convex part 52 provided on the separation holder 41. The convex portion 52 of the separation holder 41 is provided on the connecting shaft portion 44a between the left and right shafts 46. The working surface that contacts the stopper 51 is formed on a plane orthogonal to the axis, and the opposite surface gradually increases in thickness. It is formed in such a curved surface.

このように構成された基台部40に分離ホルダ41を組み付ける組み付け方法について図7を用いて説明する。
分離ホルダ41には、予めその突起47に押圧バネ43の一端側を嵌め込んである。この分離ホルダ41を基台部40に組み付ける際、図7(a)に示すように、トラック形状の軸46の長手方向軸受44の切り欠き部45の位置に合わせる。本例では、切り欠き部45が軸受44の真上部分に形成されているので、トラック形状の軸46の長手方向を基台部40に対して垂直にして図7(b)に示すように、左右の軸46をそれぞれ左右の軸受44に挿入する。挿入後、図7(c)に示すように、軸46を中心に反時計方向に分離ホルダ41を回転すると、分離ホルダ41に設けられた凸部52がストッパ51を乗り越える。このとき、乗り越える回転に対しての抵抗を受けるが、分離ホルダ41に設けられた凸部52は徐々に径を増すような形状に形成されているので、比較的スムーズに乗り越えられる。かくして、凸部52がストッパ51を乗り越えた分離ホルダ41はさらに回転することで、押圧バネ43の他端(自由端)が受け部48のすり鉢案内部50に当って窪み部49に導かれて該窪み部49に嵌まる。これによって図7(d)に示すように、分離ホルダ41の基台部40への組み付けが完成する。
An assembling method for assembling the separation holder 41 to the base 40 configured as described above will be described with reference to FIG.
One end of the pressing spring 43 is fitted into the protrusion 47 in advance in the separation holder 41. When the separation holder 41 is assembled to the base portion 40, the longitudinal direction of the track-shaped shaft 46 is aligned with the position of the notch portion 45 of the bearing 44 as shown in FIG. In this example, the notch 45 is formed in the portion directly above the bearing 44, so that the longitudinal direction of the track-shaped shaft 46 is perpendicular to the base 40 as shown in FIG. The left and right shafts 46 are inserted into the left and right bearings 44, respectively. After the insertion, as shown in FIG. 7C, when the separation holder 41 is rotated counterclockwise about the shaft 46, the convex portion 52 provided on the separation holder 41 gets over the stopper 51. At this time, although resistance against overcoming rotation is received, the convex portion 52 provided in the separation holder 41 is formed in a shape that gradually increases in diameter, and thus can be overcome relatively smoothly. Thus, the separation holder 41 with the convex portion 52 overcoming the stopper 51 further rotates, so that the other end (free end) of the pressing spring 43 hits the mortar guide portion 50 of the receiving portion 48 and is guided to the recess portion 49. It fits into the recess 49 . Thereby, as shown in FIG.7 (d), the assembly | attachment to the base part 40 of the separation holder 41 is completed.

このように、基台部40への分離ホルダ41の組み付けが非常に簡単な作業で行うことができ、しかも押圧バネ43の取り付けも容易であるうえに、バネ力の調整等もいらないのでユーザーでも簡単に行うことができる。なお、凸部52とストッパ51の当接は押圧バネ43の力では乗り越えられないが、作業者が適度の大きな力を加えることによって破損等を生ずることなく乗り越えが可能となるように、凸部52とストッパ51の材質や当接幅が適宜設定されている。ちなみに、凸部52とストッパ51はプラスチック樹脂材料から作られており、本例ではストッパ51を一体に設けた基台部40がFR−ABS樹脂、凸部52を一体に設けた分離ホルダ41がPOM(ポリアセタール樹脂)から作られている。   As described above, the assembly of the separation holder 41 to the base unit 40 can be performed by a very simple operation, and the pressing spring 43 can be easily attached and the spring force does not need to be adjusted. It can be done easily. The contact between the convex portion 52 and the stopper 51 cannot be overcome by the force of the pressing spring 43, but the convex portion can be overcome without causing damage or the like by applying an appropriate large force by the operator. The material and contact width of 52 and stopper 51 are set as appropriate. Incidentally, the convex portion 52 and the stopper 51 are made of a plastic resin material. In this example, the base portion 40 provided integrally with the stopper 51 is the FR-ABS resin, and the separation holder 41 provided integrally with the convex portion 52 is provided. It is made from POM (polyacetal resin).

このように組み付けられた分離ユニット4は、分離ホルダ41の分離パッド42分離ローラ5に当るが、このときの分離圧は押圧バネ43によって与えられている。このため、分離ホルダ41の交換等で分離ローラ5が退かされたり外されたりすると、分離ホルダ41が押圧バネ43の作用を受けて飛ばされたりすることがある。そこで、図8に示すように、基台部40の面と分離ローラ5に当接時の分離ホルダ41とでなす角度θ2、基台部40の面と凸部52がストッパ51に当っているときの分離ホルダ41とでなす角度θとすると、θ2<θが成り立つように、ストッパ51及び凸部52が設けられている。さらに、凸部52とストッパ51とが当る位置は分離ホルダ41を基台部40に装着する位置よりも上記角度θ2側に設定されている。すなわち、基台部40の面と軸46を軸受44に挿入する位置するときの分離ホルダ41とでなす角度θ1とすると、θ<θ1が成り立つように設定されている。したがって、上記した凸部52がストッパ51に当る位置の角度θはθ2<θ<θ1に設定されている。 Separation unit 4 assembled in this way, the separation pad 42 of the separation holder 41 but hits the separation roller 5, the separation pressure at this time is given by the pressing spring 43. For this reason, when the separation roller 5 is retracted or removed due to replacement of the separation holder 41 or the like, the separation holder 41 may be blown by the action of the pressing spring 43. Therefore, as shown in FIG. 8, the angle formed between the surface of the base portion 40 and the separation holder 41 when contacting the separation roller 5 is θ2, and the surface of the base portion 40 and the convex portion 52 hit the stopper 51. The stopper 51 and the convex portion 52 are provided so that θ2 <θ is satisfied, where θ is an angle formed with the separation holder 41 when the head is in contact. Furthermore, the position where the convex portion 52 and the stopper 51 abut is set on the angle θ2 side with respect to the position where the separation holder 41 is mounted on the base portion 40. That is, when the angle formed by the surface of the base portion 40 and the separation holder 41 when the shaft 46 is positioned to be inserted into the bearing 44 is θ1, θ <θ1 is established. Therefore, the angle θ at which the above-described convex portion 52 hits the stopper 51 is set to θ2 <θ <θ1.

このように構成された分離ユニット4は、凸部52がストッパ51に当る位置を上記の如く設定することによって、分離パッド42の分離ローラ5への分離圧が押圧バネ43の作用によって得られる。さらに、磨耗等で分離パッド42を交換する場合、分離ホルダ41から分離ローラ5を離しても、分離ホルダ41は外れてしまう位置に達するよりも先に凸部52がストッパ51に当るので、分離ホルダ41が押圧バネ43の作用で回転して飛ばされることがない。分離パッド42の交換で分離ホルダ41から分離ローラ5を離したときに分離ホルダ41が押圧バネ43の作用で回転してもストッパ51が凸部52に当って分離ホルダ41の回転を停止するので、分離ホルダ41が飛ばされることがない。 Separation unit 4 configured in this way, the position where the convex portion 52 hits the stopper 51 by setting as described above, the separation pressure to the separation roller 5 of the separation pad 42 is obtained, et al by the action of the pressure spring 43 . Further, when the separation pad 42 is replaced due to wear or the like, even if the separation roller 5 is separated from the separation holder 41, the protrusion 52 contacts the stopper 51 before reaching the position where the separation holder 41 comes off. The holder 41 is not rotated and blown by the action of the pressing spring 43. Even if the separation holder 41 is rotated by the action of the pressing spring 43 when the separation roller 5 is separated from the separation holder 41 by exchanging the separation pad 42, the stopper 51 hits the convex portion 52 and stops the rotation of the separation holder 41. The separation holder 41 is not skipped.

上記実施形態では、分離ホルダ41を凸部52がストッパ51に当ることによって分離ホルダ41の回転を停止したが、図9に示す実施形態では軸受44の内周面に突起44aを設けている。この突起44aは分離ホルダ41回転すると、その小判状の軸46はその頂部が当り動きを規制されるが、頂部以外の部分は当らない大きさに形成されている。また、突起44aは1個でも十分に機能するが、本例ではバランスを考慮して対角線上に2箇所設けている。このように形成した突起44aは、ユーザーが適度な強い力を加えることによって小判状軸46の頂部が乗り越えられるが、押圧バネ43の弾性力では乗り越えられない大きさに設定されている。このように設定することによって、分離パッド42の交換で分離ホルダ41から分離ローラ5を離したときに分離ホルダ41が押圧バネ43の作用で回転しても軸46の頂部が突起44aに当って分離ホルダ41の回転を停止するので、作業時に分離ホルダ41が飛ばされることがない。 In the above embodiment, the rotation of the separation holder 41 is stopped by the protrusion 52 coming into contact with the stopper 51 of the separation holder 41. However, in the embodiment shown in FIG. 9, the protrusion 44a is provided on the inner peripheral surface of the bearing 44. This protrusion 44a is separation holder 41 rotates, its oval-shaped shaft 46 is restricted movement per its top, a portion other than the top portion is formed in a size that does not hit. In addition, although only one protrusion 44a functions sufficiently, in this example, two places are provided on the diagonal line in consideration of balance. Thus formed protrusion 44a is the top of the oval-shaped shaft 46 by a user applying a suitable strong force is overcome, the elastic force of the pressing spring 43 is set to a size insurmountable. By setting in this way, when the separation roller 5 is separated from the separation holder 41 by exchanging the separation pad 42, the top of the shaft 46 hits the protrusion 44a even if the separation holder 41 rotates by the action of the pressing spring 43. Since the rotation of the separation holder 41 is stopped, the separation holder 41 is not skipped during work.

図10は、本発明のさらに他の実施形態を示す。本例では軸46連結部46aにゴム板等からなる摩擦片53が固着され、分離ホルダ41の回転が図10(b)に示す上記した角度θを満足する位置でその摩擦片53が基台部40の面に当接して回転が規制されるように構成されている。 FIG. 10 shows still another embodiment of the present invention . In this example, the friction piece 53 made of a rubber plate or the like is fixed to the connecting portion 46a of the shaft 46 , and the friction piece 53 is based on the position where the rotation of the separation holder 41 satisfies the angle θ shown in FIG. It is comprised so that rotation may be controlled in contact with the surface of the base part 40. FIG.

このように構成すると、押圧バネ43の力で回転しても摩擦片53が基台部40の面に当接して停止される。そして、取り付けもしくは取り外し時において分離ホルダ41をバネよりも強い力を加えることで摩擦片53が変形して乗り越えられる。よって、分離ホルダ41の着脱も支障なく行うことができる。   If comprised in this way, even if it rotates with the force of the press spring 43, the friction piece 53 will contact | abut on the surface of the base part 40, and will be stopped. Then, the friction piece 53 is deformed and overcomes by applying a force stronger than the spring to the separation holder 41 at the time of attachment or removal. Therefore, the separation holder 41 can be attached and detached without any trouble.

図11は、図10の実施形態の変形例で、本例では摩擦片54が分離ホルダ41側でなく、基台部40の面に固着されている。そして、分離ホルダ41が押圧バネ43の力で回転しても図11(b)に示すように、上記した角度θを満足する位置において、分離ホルダ41が摩擦片54に当ってその回転が規制される。この摩擦片54も分離ホルダ41をバネよりも強い力を加えることで変形し、乗り越えることができるので、上記実施形態と同様に分離ホルダ41の取り付け取り外し簡単に行うことができる。 FIG. 11 is a modification of the embodiment of FIG. 10, and in this example, the friction piece 54 is fixed not to the separation holder 41 side but to the surface of the base portion 40. Even when the separation holder 41 is rotated by the force of the pressing spring 43, as shown in FIG. 11B, the separation holder 41 hits the friction piece 54 at a position satisfying the angle θ described above, and the rotation is restricted. Is done. This friction Kosuhen 54 also separate holder 41 deformed by applying a force greater than the spring, it is possible to get over, can be easily carried out installation and removal of the separation holder 41 in the same manner as the above embodiment.

4 分離ユニット
5 分離ローラ
40 基台部
41 分離ホルダ
42 分離パッド
43 押圧バネ
44 軸受
44a 突起
45 切り欠き部
46 軸
51 ストッパ
52 凸部
53,54 摩擦片
4 Separating Unit 5 Separating Roller 40 Base Part 41 Separating Holder 42 Separating Pad 43 Pressing Spring 44 Bearing 44a Protrusion 45 Notch 46 Shaft 51 Stopper 52 Protruding Part 53, 54 Friction Piece

特開2000−219347号公報JP 2000-219347 A 特許第3689629号公報Japanese Patent No. 3689629

Claims (7)

シートを給送する方向に回転する給送回転体と、
該給送回転体に当接してニップを形成する摩擦部材を支持する分離ホルダと、
該分離ホルダが回転可能、且つ着脱可能に装着される保持枠体と、
前記分離ホルダを介して前記摩擦部材を前記給送回転体へ当接する方向へ押圧する弾性部材とを有するシート給送装置において、
前記分離ホルダの回転を前記弾性部材の押圧力に抗して規制する規制手段と、
前記弾性部材の一端を受ける受け部を備え、
前記受け部は、前記弾性部材の一端が導かれる窪み部を有し、
前記弾性部材の他端は、前記窪み部の外で前記分離ホルダを押圧し、
前記規制手段は、前記分離ホルダに形成された凸部と、該凸部の回転軌跡内で前記保持枠体に設けられ、且つ窪み部の外に位置する凸形状のストッパとで構成されることを特徴とするシート給送装置。
A feeding rotating body that rotates in the direction of feeding the sheet;
A separation holder that supports a friction member that forms a nip in contact with the feeding rotating body;
A holding frame on which the separation holder is rotatably and detachably mounted;
In the sheet feeding apparatus having an elastic member that presses the friction member in a direction to contact the feeding rotating body via the separation holder,
Restriction means for restricting rotation of the separation holder against the pressing force of the elastic member;
And a receiving portion for receiving one end of said elastic member,
The receiving part has a hollow part into which one end of the elastic member is guided,
The other end of the elastic member presses the separation holder outside the recess ,
The restricting means includes a convex portion formed on the separation holder, and a convex stopper provided on the holding frame body within the rotation trajectory of the convex portion and positioned outside the concave portion. A sheet feeding device characterized by the above.
請求項1に記載のシート給送装置において、前記分離ホルダは前記保持枠体に対してある角度に位置させると着脱が可能になり、その着脱時の保持枠体の面からの角度をθ1、前記摩擦部材が前記給送回転体に当接時の保持枠体の面からの角度をθ2、前記規制手段が規制時の保持枠体の面からの角度をθとすると、θ2<θ<θ1に設定されていることを特徴とするシート給送装置。   The sheet feeding apparatus according to claim 1, wherein the separation holder is detachable when positioned at an angle with respect to the holding frame, and an angle from the surface of the holding frame at the time of detachment is θ1, Assuming that the angle from the surface of the holding frame when the friction member is in contact with the feeding rotating body is θ2, and θ is the angle from the surface of the holding frame when the restricting means is restricted, θ2 <θ <θ1 A sheet feeding device, characterized in that the sheet feeding device is set. 請求項1または2に記載のシート給送装置において、前記分離ホルダが前記弾性部材の弾性力よりも大きいある力以上を加えることによって前記凸部が前記凸形状のストッパを乗り越えることを特徴とするシート給送装置。 3. The sheet feeding apparatus according to claim 1 , wherein the convex portion gets over the convex stopper when the separation holder applies a force greater than or equal to an elastic force of the elastic member. Sheet feeding device. 請求項1ないしの何れかに記載のシート給送装置において、前記窪み部の大きさは、前記弾性部材と略等しいことを特徴とするシート給送装置。 A sheet feeding apparatus according to any one of claims 1 to 3, the size of the recess portion, the sheet feeding, wherein substantially equal to the elastic member device. 請求項1ないしの何れかに記載のシート給送装置において、前記弾性部材の一端と当たり、前記窪み部に導く傾斜状の案内部を設けたことを特徴とするシート給送装置。 A sheet feeding apparatus according to any one of claims 1 to 4, wherein the contact with the one end of the elastic member, a sheet feeding apparatus is characterized by providing the inclined guide portion for guiding said recess. 請求項1ないしの何れかに記載のシート給送置において、前記分離ホルダは、連結部によって一体に連結し、且つ前記保持枠体に挿入可能な軸部を設けたことを特徴とするシート給送装置。 In sheet Oku置according to any one of claims 1 to 5, wherein the separation holder, integrally connected by a connecting portion, and is characterized by providing an insertable shaft portion to the holding frame sheet Feeding device. 請求項1ないしの何れかに記載のシート給送装置を備えることを特徴とする画像形成装置。 An image forming apparatus comprising: a sheet feeding apparatus according to any one of claims 1 to 6.
JP2010111044A 2010-05-13 2010-05-13 Sheet feeding device Active JP5760329B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2010111044A JP5760329B2 (en) 2010-05-13 2010-05-13 Sheet feeding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010111044A JP5760329B2 (en) 2010-05-13 2010-05-13 Sheet feeding device

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP2014157378A Division JP5846266B2 (en) 2014-08-01 2014-08-01 Sheet feeding device

Publications (2)

Publication Number Publication Date
JP2011236042A JP2011236042A (en) 2011-11-24
JP5760329B2 true JP5760329B2 (en) 2015-08-05

Family

ID=45324459

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2010111044A Active JP5760329B2 (en) 2010-05-13 2010-05-13 Sheet feeding device

Country Status (1)

Country Link
JP (1) JP5760329B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6331659B2 (en) * 2014-05-01 2018-05-30 富士ゼロックス株式会社 FEEDING DEVICE, IMAGE FORMING DEVICE HAVING THE SAME, AND IMAGE READING DEVICE

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63208451A (en) * 1987-02-20 1988-08-29 Minolta Camera Co Ltd Paper supply device
JPH0618346U (en) * 1992-08-11 1994-03-08 富士通機電株式会社 Medium separator switching mechanism
JP3330249B2 (en) * 1995-02-24 2002-09-30 東芝テック株式会社 Automatic paper feeder
JPH11245483A (en) * 1998-02-27 1999-09-14 Canon Inc Opening/closing apparatus and image-forming apparatus
JP3618659B2 (en) * 2000-11-08 2005-02-09 ニスカ株式会社 Document sheet separation structure in automatic document feeder
JP2009273682A (en) * 2008-05-15 2009-11-26 Panasonic Corp Drink extractor

Also Published As

Publication number Publication date
JP2011236042A (en) 2011-11-24

Similar Documents

Publication Publication Date Title
US8240655B2 (en) Image recording apparatus having pivotable roller arm
KR100426537B1 (en) Paper feeding cassette for printer
JP6695763B2 (en) Paper transport device and image forming apparatus including the same
US10246281B2 (en) Sheet conveying apparatus
JP3731260B2 (en) Paper feeding device and image recording apparatus including the same
US20210024306A1 (en) Medium feeding apparatus
JP4613768B2 (en) Paper feeding device and image forming apparatus using the paper feeding device
US9796542B2 (en) Sheet feeding device and image forming apparatus employing the same
JP2010255706A (en) Power transmission device and sending device
JP5760329B2 (en) Sheet feeding device
JP5846266B2 (en) Sheet feeding device
JP6424650B2 (en) Sheet conveying device
US7543814B2 (en) Automatic paper feeding apparatus
JP6052373B2 (en) Sheet feeding device
US8734038B2 (en) Image forming apparatus which guides an ejected recording medium downwards
US9511963B2 (en) Conveyor device
JP2001080753A (en) Paper feeding device
JP2013001528A (en) Sheet support device
JP2012159553A (en) Paper conveyance device
KR20080051075A (en) Roller and sheet feeding apparatus
JP4514665B2 (en) Sheet double feed prevention device and image forming apparatus
JP3928917B2 (en) Sheet double feed prevention device
JP4900948B2 (en) Roller support structure, image reading apparatus, sheet conveying apparatus, sheet feeding apparatus, and image processing apparatus
JP5850246B2 (en) Feeding device
US10067451B1 (en) Image forming apparatus

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20130218

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20131226

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20140107

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20140305

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20140603

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20140801

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20141209

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20150305

A911 Transfer of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20150312

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20150512

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20150525

R151 Written notification of patent or utility model registration

Ref document number: 5760329

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151