JP2008185635A5 - - Google Patents

Claims (11)

装置本体に対して開位置と閉位置の間で開閉自在なドア部材のドア開閉機構であって、
前記ドア部材と同一の第１の支点を中心に前記ドア部材と一体となって回動するレバー部材と、
前記レバー部材が回動する際、前記レバー部材が当接するカム部材と、を有し、
前記カム部材は、前記レバー部材が回動する際の前記カム部材との当接部の軌跡と略同一形状の当接面を有するとともに、前記ドア部材の開位置における前記レバー部材の当接部との接点と前記第１の支点を結ぶ線の延長線近傍に設けた第２の支点を中心に回転可能であり、前記第２の支点を中心に前記レバー部材と当接する方向に付勢されていることを特徴とするドア開閉機構。 A door opening / closing mechanism of a door member that is openable and closable between an open position and a closed position with respect to the apparatus main body,
A lever member that rotates integrally with the door member around the same first fulcrum as the door member;
A cam member with which the lever member abuts when the lever member rotates ,
The cam member, together with the lever member is closed a contact surface of the abutment portion of the trajectory and substantially the same shape of the cam member when rotated, the abutment of the lever member in the open position of said door member rotatable about a second pivot provided in the vicinity extension of a line connecting the contact point first fulcrum of the parts, biasing the lever member and the abutting direction around the second supporting point The door opening and closing mechanism characterized by being made. 回動する前記レバー部材を案内するガイド穴を備え、前記レバー部材は、前記ガイド穴に案内されるガイド部を有し、前記ガイド部の外周に前記ガイド穴に嵌合して弾性変形する弾性部材を設けたことを特徴とする請求項１に記載のドア開閉機構。 A guide hole for guiding the lever member rotates, the lever member, the guide has a guide portion to be guided into the hole, it is elastically deformed fitted in the guide hole to the outer periphery of the guide portion elastic The door opening / closing mechanism according to claim 1, further comprising a member. 前記ガイド部は、前記弾性部材を介して前記レバー部材の開位置と閉位置でそれぞれ前記ガイド穴に設けたストッパに突き当たることを特徴とする請求項２に記載のドア開閉機構。   The door opening / closing mechanism according to claim 2, wherein the guide portion abuts against a stopper provided in the guide hole at the open position and the closed position of the lever member via the elastic member. 前記ガイド穴は、前記ドア部材の回動時に、前記弾性部材が前記ガイド穴の幅方向に弾性変形しつつ前記ガイド部が移動するよう前記ガイド部の回動軌跡に沿った円弧状の長穴形状であり、かつ閉位置に対応する前記ガイド穴の端部は、前記弾性部材の弾性変形が解放されるよう他の部分よりも幅が広くなっていることを特徴とする請求項２に記載のドア開閉機構。 The guide hole, the at turning of the door member, wherein the elastic member is the guide holes arcuate elongated hole the guide portion while being elastically deformed in the width direction along the rotational path of the guide portion to move the the shape, and the ends of the guide holes corresponding to the closed position, according to claim 2, characterized in that the width is wider than the other portion so that the elastic deformation of the elastic member is released Door opening and closing mechanism. 前記装置本体に対して前記ドア部材を閉位置で保持するための係合手段を有し、前記ガイド部が閉位置に対応する前記ガイド穴の端部に到達したとき前記係合手段の係合が開始されることを特徴とする請求項４に記載のドア開閉機構。 An engagement means for retaining said door member in a closed position relative to the apparatus main body, engagement of said engaging means when said guide portion has reached the end of the guide holes corresponding to the closed position 5. The door opening / closing mechanism according to claim 4, wherein 前記ドア部材の開閉を検知する開閉検知手段を有し、前記ドア部材は、前記装置本体上方の第１の支点を中心に前記第１の支点より下方から跳ね上げ式で開閉する構成であり、前記開閉検知手段を前記ドア部材の回動中心軸方向の一方側に設け、前記レバー部材及び前記カム部材を前記ドア部材の他方側に設けたことを特徴とする請求項１乃至５のいずれか１項に記載のドア開閉機構。 An open / close detecting means for detecting opening / closing of the door member , wherein the door member is configured to open and close in a flip-up manner from below the first fulcrum centered on the first fulcrum above the apparatus main body; 6. The open / close detection means is provided on one side of the door member in the direction of the rotation center axis , and the lever member and the cam member are provided on the other side of the door member. The door opening / closing mechanism according to item 1. 前記レバー部材は、前記ドア部材を軸支するベース部材の外側に設けられていることを特徴とする請求項２に記載のドア開閉機構。 The door opening / closing mechanism according to claim 2, wherein the lever member is provided outside a base member that pivotally supports the door member. 前記カム部材の当接面のうち、前記弾性部材が前記ガイド穴に嵌合して弾性変形しつつ前記ガイド部が移動する領域に、前記レバー部材に対して前記当接面より摩擦抵抗の大きい摩擦部材を設けたことを特徴とする請求項２に記載のドア開閉機構。 Of the contact surface of the cam member, the elastic member is fitted into the guide hole and elastically deformed, and the guide portion moves in a region where the friction resistance with respect to the lever member is larger than that of the contact surface. The door opening / closing mechanism according to claim 2, further comprising a friction member. 前記レバー部材は、前記カム部材の当接面に当接して回転するローラ部材を有し、前記ローラ部材を前記ドア部材の開位置では前記カム部材の当接面と非接触となるように設けたことを特徴とする請求項１に記載のドア開閉機構。   The lever member includes a roller member that rotates in contact with the contact surface of the cam member, and the roller member is provided so as not to contact the contact surface of the cam member when the door member is in the open position. The door opening / closing mechanism according to claim 1. シートを搬送する搬送手段と、装置を開口するドア部材を開閉可能に備えたシート搬送装置であって、前記ドア部材のドア開閉機構として請求項１乃至９のいずれか１項に記載のドア開閉機構を有することを特徴とするシート搬送装置。   10. A sheet conveying apparatus comprising a conveying means for conveying a sheet and a door member that opens the apparatus so as to be openable and closable. A sheet conveying apparatus having a mechanism. シート上に画像を形成する画像形成部と、装置本体に対して開位置と閉位置の間で開閉自在なドア部材と、備えた画像形成装置であって、前記ドア部材のドア開閉機構として請求項１乃至９のいずれか１項に記載のドア開閉機構を有することを特徴とする画像形成装置。 An image forming unit for forming an image on a sheet, a door member freely opened and closed between the open and closed positions relative to the apparatus main body, an image forming apparatus including, according as the door opening and closing mechanism of the door member An image forming apparatus comprising the door opening / closing mechanism according to any one of Items 1 to 9.