JP3628581B2 - Opening and closing mechanism - Google Patents

Opening and closing mechanism Download PDF

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Publication number
JP3628581B2
JP3628581B2 JP2000080328A JP2000080328A JP3628581B2 JP 3628581 B2 JP3628581 B2 JP 3628581B2 JP 2000080328 A JP2000080328 A JP 2000080328A JP 2000080328 A JP2000080328 A JP 2000080328A JP 3628581 B2 JP3628581 B2 JP 3628581B2
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Japan
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lid
opening
main body
closing mechanism
resistance
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JP2001264900A (en
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達也 小川
秀雄 吉川
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Sharp Corp
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Sharp Corp
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Description

【0001】
【発明の属する技術分野】
この発明は、上面にスキャナユニットを配置した画像形成装置等の本体と蓋体とからなる構造体に適用され、本体に対する蓋体の開閉動作を補助する開閉機構に関する。
【0002】
【従来の技術】
本体に対して蓋体を開閉自在にした構造体では、蓋体を開閉する際の構造体の安定性や作業者の操作性及び安全性を確保するために、本体に対する蓋体の開放範囲を所定量に規定するとともに、蓋体の開閉速度を制御する必要がある。特に、上面にスキャナユニットを開閉自在に配置した画像形成装置のように、蓋体の構造が複雑であったり、大きな質量を有する場合には、蓋体が自重によって開放位置から落下することにより、作業者の身体が蓋体と本体との間に挟み込まれて大きな事故を発生する危険性があるとともに、スキャナユニットや装置本体の破損や故障を生じる問題がある。
【0003】
そこで、従来より、本体に対して蓋体を開閉自在にした構造体では、蓋体と本体との間に本体に対する蓋体の開閉動作を補助する開閉機構を備えている。この開閉機構として、特開平9−311389号公報に開示されているように、上下端のそれぞれを蓋体及び本体に回転自在に支持したダンパーを用いたものがある。
【0004】
このダンパーは、ピストンが擦動するシリンダ内に液体又は気体を充填し、液体又は気体の流動抵抗をピストンに作用させることにより伸縮動作に負荷を生じるようにしたものである。このようなダンパーを開閉機構に用いることにより、本体に対する蓋体の開放動作及び閉鎖動作に負荷を与え、蓋体の開閉速度を低速に制限し、開放位置からの蓋体の自由落下を防止して、挟み込み事故や装置の破損及び故障の発生を防ぐことができる。
【0005】
【発明が解決しようとする課題】
しかしながら、従来の開閉機構に用いられるダンパーは、液体又は気体をシリンダ内に密封して充填する必要があり、製造作業が煩雑であるとともに構造が複雑で高価にならざるを得ず、構造体のコストが高騰する問題がある。
【0006】
また、ダンパーは、縮小時にピストンに固定されたレバーをシリンダ内に収納するように構成しており、シリンダの小型化には限界がある。このため、本体に対して蓋体を閉鎖した状態で構造体の開閉面内にダンパーを収納するための比較的大きなスペースが必要になり、構造体の大型化を招来する問題がある。
【0007】
さらに、スキャナユニットを開閉自在にした画像形成装置のように、比較的質量の大きな蓋体を本体の上面に開閉自在にした構造体では、蓋体の開放時にダンパーから負荷が作用することにより、蓋体を開放方向に移動させる際に大きな操作力が必要になるため、作業時の操作性が低下する問題もある。これは、比較的質量の大きな蓋体を本体の底面に開閉自在にした構造体において、蓋体の閉鎖時に同様に生じる問題である。
【0008】
この発明の目的は、簡単な構成で蓋体の閉鎖方向の移動速度を制限することができ、高価かつ大きなスペースを必要とすることがなく、構造体のコストダウン及び小型化を実現することができるとともに、蓋体の開放動作時又は閉鎖動作時には蓋体に抵抗力が作用しないようにし、蓋体を本体に対して開放又は閉鎖する際の操作性を向上することができる開閉機構を提供することにある。
【0009】
【課題を解決するための手段】
この発明は、上記の課題を解決するための手段として、以下の構成を備えている。
【0010】
(1) 本体に対して蓋体を開閉自在に支持する開閉機構において、蓋体の開閉動作に対する抵抗力を発生する抵抗力発生部材と、蓋体の開閉方向のいずれか一方向への動作中に蓋体と抵抗力発生部材との間を切断するとともに蓋体の開閉方向の残る他方向への動作中に蓋体と抵抗力発生部材との間を接続する切換部材と、を設け
前記切換部材が、蓋体の開閉動作にともなって本体側に設けられた駆動部材との係合によって回転するとともに蓋体側において所定範囲内で上下方向に移動自在に軸支された回転体を含み、
前記抵抗力発生部材が、蓋体の開閉動作にともなって所定範囲内の上端部又は下端部に移動した回転体に制動力を付与する部材であることを特徴とする。
【0011】
この構成においては、本体に対する蓋体の開放時又は閉鎖時のいずれか一方においてのみ抵抗力発生部材が発生する抵抗力が蓋体に作用する。したがって、本体上面を開閉する蓋体の閉鎖時、又は、本体底面を開閉する蓋体の開放時のように、蓋体の自重が蓋体の移動方向に作用する状況で、蓋体の移動に抵抗力が作用するようにすると、蓋体が自由落下することがない。また、本体上面を開閉する蓋体の開放時、又は、本体底面を開閉する蓋体の閉鎖時のように、蓋体の自重が蓋体の移動方向と反対方向に作用する状況で、蓋体の移動に抵抗力が作用しないようにすると、蓋体を移動させるために蓋体の自重を超える力を作用させる必要がない。
また、蓋体の開閉時に駆動部材との係合によって回転体が本体内を上下方向に移動しながら回転し、かつ、蓋体における所定範囲内の上端部及び下端部に移動し、所定範囲の上端部又は下端部のいずれかに位置する回転体に制動力が付与される。したがって、本体内において長尺物が回転することがなく、本体の開閉面内に大きなスペースを設ける必要がない。また、蓋体の自重が蓋体の移動方向に作用する状況で、所定範囲の上端部又は下端部のいずれかに位置する回転体に制動力が作用するようにすると、蓋体が自由落下することがない。さらに、蓋体の自重が蓋体の移動方向と反対方向に作用する状況で、所定範囲の下端部又は上端部のいずれかに位置する回転体に制動力が作用しないようにすると、蓋体を移動させるために蓋体の自重を超える力を作用させる必要がない。
【0012】
(2) 前記回転体が、蓋体の開放時に自重によって移動範囲内の下端部に移動して抵抗力発生部材から離間し、蓋体の閉鎖時に駆動部材との係合によって所定範囲内の上端部に移動して抵抗力供給部材に結合することを特徴とする。
【0013】
この構成においては、回転体の自重、及び、回転体と駆動部材との係合により、回転体が所定範囲内の下端部及び上端部に移動する。したがって、回転体自体及び駆動部材によって回転体を抵抗力供給部材に結合させるための部材が簡単に構成される。
【0014】
(3) 前記抵抗力発生部材が、弾性体の弾性力によって摩擦体に押圧される可動体を含むことを特徴とする。
【0015】
この構成においては、弾性体、摩擦体及び可動体によって抵抗力発生部材が構成され、弾性体の弾性力によって摩擦体に押圧された可動体を介して蓋体に開閉動作の抵抗力が供給される。したがって、摩擦体の材質及び弾性体の弾性力に応じて、蓋体に供給される抵抗力が増減変化する。
【0018】
【発明の実施の形態】
図1(A)及び(B)は、この発明の実施形態に係る開閉機構を構成する蓋体側部材の正面図及び側面図である。また、図2は、同開閉機構を構成する本体側部材の外観図である。なお、この実施形態では、本体上面に蓋体を開閉自在に設けた構造体に適用される開閉機構を例にあげて説明する。この実施形態に係る開閉機構は、図1に示す蓋体側部材1と図2に示す本体側部材2とによって構成されている。蓋体側部材1は、上下方向に所定の長さを有する棒状の軸体11の上端部に軸受部12を形成し、下端部に支持部13を形成したものである。
【0019】
軸受部12は、蓋体の内側面に形成された軸部に外嵌する。これによって、軸体11は上端部を支点として蓋体の底面に回転自在に支持される。支持部13は、互いに平行な2側面の間の空間内に、この発明の抵抗力発生部材を構成する摩擦ギア14(可動体)、摩擦板15 (摩擦体)及びスプリング16(弾性体)、並びに、この発明の回転体(切換部材)である連結ギア17を収納している。
【0020】
摩擦ギア14は両端を支持部13の2側面に固定した軸14aに外嵌しており、摩擦ギア14は支持部13内において回転自在かつ回転軸方向に移動自在にされている。摩擦ギア14の一方の側面には摩擦板15が接触しており、他方の側面にはスプリング16の一端が圧接している。これによって、摩擦ギア14は、スプリング16の弾性力により、摩擦板15側に付勢されており、摩擦ギア14は摩擦板15から回転動作に対する抵抗力が作用している。
【0021】
連結ギア17の回転軸17aの両端は支持部13の2側面に形成された上下方向の長孔18に嵌入しており、支持部13内において連結ギア17は長孔18の平行部によって規定される上下方向の所定範囲内において移動自在かつ回転自在にされている。連結ギア17は、所定範囲内の上端位置において摩擦ギア14に噛み合う。なお、回転軸17aの両端は長孔18を内側から貫通して支持部13の2側面の外側に所定量だけ突出している。
【0022】
本体側部材2は、横断面が略コの字型断面を呈する上下方向を長手方向とした筐体21の内側面にガイド溝22及びラックギア23(この発明の駆動部材に相当する。)を形成したものであり、本体内の所定位置に固定される。即ち、コの字型断面を呈する筐体21における互いに平行な2側面の内側面には、蓋体側部材1の側面に突出した回転軸17aの両端のそれぞれが嵌入するガイド溝22が上下方向に形成されており、この2側面に挟持された背面の内側面には上下方向にギアを配列したラックギア23が取り付けられている。なお、ガイド溝22において溝幅が拡大された上端部内には、回転軸17aの端部を保持する保持部24が形成されている。
【0023】
図3は、上記開閉機構における蓋体側部材と本体側部材との係合状態を示す要部の外観図である。この実施形態に係る開閉機構では、蓋体部材1の下端部が本体側部材2の内部に上方から侵入し、蓋体側部材1の支持部13の外側に突出した回転軸17aの両端部が本体側部材2の側面の内側面に形成されたガイド溝22内に嵌入した状態で、蓋体側部材1と本体側部材2とが結合される。このとき、蓋体側部材1の連結ギア17が本体側部材2のラックギア23に噛み合う。
【0024】
この構成によって、回転軸17aの端部が上下方向に形成されたガイド溝22内を擦動することにより、蓋体側部材1は本体側部材2に対して上下方向に移動する。このとき、ラックギア23に噛合する連結ギア17が回転軸17aを中心に回転する。
【0025】
図4及び図5は上記開閉機構の動作を示す図であり、図4(A)及び(B)は蓋体の開放時における開閉機構の動作状態を示す側面図及び正面図、図5(A)及び(B)は蓋体の閉鎖時における開閉機構の動作状態を示す側面図及び正面図である。図4に示すように、本体の上面における蓋体の開放時には、蓋体の上方への移動にともなって開閉機構の蓋体側部材1が上方に移動し、蓋体側部材1の結合ギア17は本体側部材2のラックギア23との噛合によって上方に移動しつつ矢印C方向に回転する。
【0026】
この時、蓋体側部材1の支持部13内において、結合ギア17の回転軸17aの両端部は長孔18内において所定範囲内で上下方向に移動自在にされており、結合ギア17は回転軸17aの両端部を介して長孔18の下端部から上方向の移動力の伝達を受ける。即ち、結合ギア17は、自重及びラックギア23からの噛合抵抗によって回転軸17aが長孔18の下端部に移動した後に上方への移動を開始し、蓋体側部材1が上方に移動する間においてこの状態を維持する。
【0027】
したがって、結合ギア17は、支持部13内において摩擦ギア14と噛合せず、摩擦板15及びスプリング16によって摩擦ギア14に生じる摩擦抵抗の作用を受けることがなく、支持部13内において自由に矢印C方向に回転する。このため、蓋体の開放時における蓋体側部材1の上方への移動に大きな負荷が作用することがなく、比較的小さな力で蓋体を開放することができる。
【0028】
一方、図5に示すように、本体の上面における蓋体の閉鎖時には、蓋体の下方への移動にともなって開閉機構の蓋体側部材1が下方に移動し、蓋体側部材1の結合ギア17は本体側部材2のラックギア23との噛合によって下方に移動しつつ矢印D方向に回転する。
【0029】
この時、蓋体側部材1の支持部13内において、結合ギア17は回転軸17aの両端部を介して長孔18の上端部から下方向の移動力の伝達を受ける。即ち、結合ギア17は、ラックギア23からの噛合抵抗によって回転軸17aが長孔18の上端部に移動した後に下方への移動を開始し、蓋体側部材1が下方に移動する間においてこの状態を維持する。
【0030】
したがって、結合ギア17は、支持部13内において摩擦ギア14と噛合し、摩擦板15及びスプリング16によって摩擦ギア14に生じる摩擦抵抗を受けた状態で支持部13内において矢印D方向に回転する。このため、蓋体の閉鎖時における蓋体側部材1の下方への移動に大きな負荷が作用し、蓋体が自重によって自由落下することがない。
【0031】
以上のようにして、本体上面における蓋体の開放時には、開閉機構の蓋体側部材2において連結ギア17が自由に回転し、蓋体を持ち上げる力に略等しい比較的小さな力で蓋体を開放することができ、蓋体の開放作業を容易に行うことかできる。一方、本体上面における蓋体の閉鎖時には、開閉機構の蓋体側部材において摩擦部材15の摩擦力が摩擦ギア14を介して連結ギア17に制動力として作用し、蓋体の自重に加えて比較的大きな力が作用しない限り蓋体を閉鎖することができず、誤って作業者の身体の一部が蓋体と本体との間に挟み込まれる事故、並びに、本体及び蓋体の内部装置の破損や故障の発生を未然に防止することができる。
【0032】
また、連結ギア17の自重、及び、連結ギア17とラックギア23との係合により、連結ギア17を所定範囲内の下端部及び上端部に移動させるようにしている。このため、連結ギア17自体及びラックギア23によって連結ギア17を摩擦ギア14に噛合させるための部材を簡単に構成することができ、コストの上昇や機構の大型化を生じることがない。
【0033】
図6(A)〜(C)は、蓋体の開放時における上記開閉機構の蓋体側部材と本体側部材との関係を示す図である。同図(A)は本体に対して蓋体が閉鎖されている状態を示し、同図(B)は本体に対して蓋体が開放されている間の状態を示し、同図(C)は本体に対して蓋体が完全に開放された状態を示している。
【0034】
同図(A)に示すように、本体3の上面が蓋体4によって閉鎖されている状態では、蓋体側部材1の側面の下端部から突出した回転軸17aの両端は、本体側部材2のガイド溝22の下端近傍に位置している。なお、前述のように、蓋体側部材1の上端に形成されている軸受部12は、蓋体4の開放端側(前面側)の内側面に形成されている軸部41に回転自在に外嵌している。
【0035】
同図(A)に示す状態から本体3の上面に対して背面側をヒンジとして蓋体4を開放していくと、同図(B)に示すように、蓋体4の開放端側の上方への移動にともなって蓋体側部材1も上方に移動し、蓋体側部材1の回転軸17aの両端部は本体側部材2のガイド溝22内を上昇していく。このとき、蓋体4は背面側を支点として回転動作を行うため、蓋体側部材1の上端部を軸支した蓋体4の前面側は上昇しつつ背面側に移動する。
【0036】
一方、蓋体側部材1の下端部が係合するガイド溝22を有する本体側部材2は、本体3内の所定の位置に固定されている。したがって、蓋体側部材1は、蓋体4の開放動作に伴って上端部を背面側にして傾斜する。但し、本体3の上面における蓋体4の開放量、即ち、蓋体4の回転量が小さい範囲では蓋体4の前面側の背面側への移動量は比較的少ないため、本体3の上面における本体側部材2の上方に蓋体側部材1を通過させるための大きなスペースを設ける必要はない。
【0037】
本体側部材2においてガイド溝22の上端は閉じられているため、蓋体4の開放方向への移動は蓋体側部材1の回転軸17aの両端部がガイド溝22の上端に当接することによって規制される。したがって、蓋体4の開放量は、蓋体側部材1の上下方向の長さによって決定される。上述のように、ガイド溝22は上端部において背面側に溝幅が拡大されており、この部分に保持部24が形成されている。このため、回転軸17aの両端部がガイド溝22の上端に当接した際に、上端を背面側にして傾斜していた蓋体側部材1の下端部は、自重によってガイド溝22内を背面側に移動し、同図(C)に示すように、回転軸17aの両端部は保持部24の上面に当接する。この状態で、蓋体側部材1は略垂直に保持され、蓋体4を開放した状態に保つ。
【0038】
図7(A)〜(D)は、蓋体の閉鎖時における上記開閉機構の蓋体側部材と本体側部材との関係を示す図である。同図(A)は本体に対して蓋体が開放されている状態を示し、同図(B)及び(C)は本体に対して蓋体を開放している間の状態を示し、同図(D)は本体に対して蓋体が完全に開放された状態を示している。
【0039】
同図(A)に示すように、ガイド溝22の上端部に形成された保持部材24上に回転軸17aを当接させて停止している蓋体4の開放状態から蓋体4を閉鎖する場合には、蓋体4の前面側を同図(A)に示す状態からさらに上方に移動させる。これによって、同図(B)に示すように、上端の軸受部12において蓋体4の軸部41に軸支されている蓋体側部材1も上方に移動し、回転軸17aの両端部はガイド溝22内において保持部材24の上方の空間に移動し、保持部材24に当接しなくなる。
【0040】
このとき、背面側をヒンジとして回転動作を行う蓋体4の前面側は、上昇しつつ背面側に移動する。このため、蓋体側部材1の上端も蓋体4の前面側の変位にともなって背面側に移動し、蓋体側部材1は上端部を背面側にして傾斜する。この状態で蓋体側部材1において回転軸17aが保持部材24に当接しなくなった下端部は、蓋体側部材1の垂直状態を維持すべく自重によって下端側を背面側に移動させる。
【0041】
この後、蓋体4を上方に持ち上げている力を解除すると、蓋体4の前面側は自重による背面側をヒンジとした回転動作によって下降しつつ前面側に移動する。これにともなって蓋体側部材1も下降しつつ前面側に移動し、同図(C)に示すように、蓋体側部材1の下端部の回転軸17aはガイド溝22内において保持部24の背面側及び下面側を通過してガイド溝22の前面側に移動する。
【0042】
ガイド溝22の前面側に達した回転軸17aの両端部は、ガイド溝22において上下方向に形成された幅の狭い部分に露出し、上下方向の支持を受けなくなる。これによって、回転軸17aの両端部は、蓋体4の前面側の下降にともなって、同図(D)に示すように蓋体4が本体3の上面を完全に閉鎖するまで、ガイド溝22内を下方に擦動していく。
【0043】
以上の動作により、この実施形態に係る開閉機構では、蓋体側部材1の下端部に突出した回転軸17aが、本体側部材2のガイド溝22の上端部において溝幅が背面側に拡大された部分に形成されている保持部24の上面に当接させることによって蓋体4の開放状態を確実に維持することができるとともに、蓋体4を開放状態からさらに上方に移動させることによって回転軸17aの保持部24に対する当接状態を解除して蓋体4を閉鎖させることができる。
【0044】
また、本体側部材2は本体3の内部に長手方向を上下方向にして固定されており、本体3の上面に対する蓋体4の開閉動作時には本体側部材2の上面からの蓋体側部材1の延出量が変化するようにされている。したがって、蓋体4によって開閉される本体3の上面には本体側部材2の上方において蓋体側部材1の軸体11の横断面に略等しい形状及び大きさのスペースが確保されていればよく、本体3の上面に開閉機構を収納するための大きなスペースを設ける必要がなく、構造体の大型化を招来することがない。
【0045】
なお、上記の実施形態では、本体の上面を蓋体によって開閉するようにした構造体に適用される開閉機構を例にあげて説明したが、本体の側面又は底面を開閉する蓋体を備えた構造体においても、この発明の開閉機構を適用することができる。但し、本体の側面を開閉する蓋体を備えた構造体に適用する場合には、本体側部材のガイド溝内における保持部の形状を変更する必要がある。また、本体の底面を開閉する蓋体を備えた構造体に適用する場合には、さらに、蓋体の開放時に連結ギアが摩擦ギアに噛合するとともに、蓋体の閉鎖時に連結ギアが摩擦ギアに噛合しないように構成する必要がある。これによって、本体の側面又は底面を開閉する蓋体を備えた構造体においても、蓋体の自重による自由落下を防止して作業者の安全性、及び、装置の破損等を防止できるとともに、蓋体を重力方向と逆方向に動作させるために必要な力が増加しないようにして作業性を向上することができる。
【0046】
【発明の効果】
この発明は、以下の効果を奏することができる。
【0047】
(1) 本体上面を開閉する蓋体の閉鎖時、又は、本体底面を開閉する蓋体の開放時のように、蓋体の自重が蓋体の移動方向に作用する状況で蓋体の移動に抵抗力を作用させることにより、蓋体の自由落下を防止することができ、作業者の身体が蓋体と本体との間に挟み込まれる事故、及び、蓋体の破損を防止することができる。また、本体上面を開閉する蓋体の開放時、又は、本体底面を開閉する蓋体の閉鎖時のように、蓋体の自重が蓋体の移動方向と反対方向に作用する状況で、蓋体の移動に抵抗力を作用させないようにすることにより、蓋体を移動させるために蓋体の自重を超える力を作用させる必要をなくし、蓋体の開閉作業の作業性が劣化することを防止できる。
また、蓋体の開閉時に駆動部材との係合によって回転体が本体内を上下方向に移動しながら回転し、かつ、蓋体における所定範囲内の上端部及び下端部に移動し、所定範囲の上端部又は下端部のいずれかに位置する回転体に制動力を付与することにより、本体内において長尺物が回転することがなく、本体の開閉面内に大きなスペースを設ける必要をなくし、本体の大型化を防止することができる。また、蓋体の自重が蓋体の移動方向に作用する状況で、所定範囲の上端部又は下端部のいずれかに位置する回転体に制動力を作用させることにより、蓋体の自由落下を防止して挟み込み事故や蓋体の破損等を未然に防止することができる。さらに、蓋体の自重が蓋体の移動方向と反対方向に作用する状況で、所定範囲の下端部又は上端部のいずれかに位置する回転体に制動力を作用させないことにより、蓋体を移動させるために蓋体の自重を超える力を作用させる必要をなくして蓋体の操作性を向上することができる。
【0048】
(2) 回転体の自重、及び、回転体と駆動部材との係合により、回転体を所定範囲内の下端部及び上端部に移動させることにより、回転体自体及び駆動部材によって回転体を抵抗力供給部材に結合させるための部材を簡単に構成することができ、コストの上昇や機構の大型化を防止することができる。
【0049】
(3) 弾性体、摩擦体及び可動体によって抵抗力発生部材を構成し、弾性体の弾性力によって摩擦体に押圧された可動体を介して蓋体に開閉動作の抵抗力を供給することにより、摩擦体の材質及び弾性体の弾性力に応じて、蓋体に供給される抵抗力を増減変化させることができ、蓋体の重量に応じた適正な抵抗力を付与することができる。
【図面の簡単な説明】
【図1】この発明の実施形態に係る開閉機構を構成する蓋体側部材の正面図及び側面図である。
【図2】同開閉機構を構成する本体側部材の外観図である。
【図3】上記開閉機構における蓋体側部材と本体側部材との係合状態を示す要部の外観図である。
【図4】蓋体の開放時における開閉機構の動作状態を示す側面図及び正面図である。
【図5】蓋体の閉鎖時における開閉機構の動作状態を示す側面図及び正面図である。
【図6】蓋体の開放時における上記開閉機構の蓋体側部材と本体側部材との関係を示す図である。
【図7】蓋体の閉鎖時における上記開閉機構の蓋体側部材と本体側部材との関係を示す図である。
【符号の説明】
1−蓋体側部材材
2−本体側部材
3−本体
4−蓋体
11−軸体
12−軸受部
13−支持部
14−摩擦ギア(抵抗力発生部材の可動体)
15−摩擦板(抵抗力発生部材の摩擦体)
16−スプリング(抵抗力発生部材の弾性体)
17−連結ギア(切換部材の回転体)
22−ガイド溝
23−ラックギア(駆動部材)
24−保持部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an opening / closing mechanism that is applied to a structure including a main body and a lid body of an image forming apparatus or the like in which a scanner unit is disposed on an upper surface and assists the opening / closing operation of the lid body with respect to the main body.
[0002]
[Prior art]
In a structure that allows the lid to be opened and closed with respect to the main body, in order to ensure the stability of the structure when opening and closing the lid and the operability and safety of the operator, the range of opening of the lid to the main body is limited. It is necessary to control the opening / closing speed of the lid while defining the amount to a predetermined amount. In particular, when the structure of the lid is complex or has a large mass, such as an image forming apparatus in which the scanner unit is arranged to be openable and closable on the upper surface, the lid falls from its open position by its own weight, There is a risk that the operator's body may be sandwiched between the lid and the main body, resulting in a serious accident, and the scanner unit and the apparatus main body may be damaged or broken.
[0003]
Therefore, conventionally, in a structure in which the lid is openable and closable with respect to the main body, an opening / closing mechanism for assisting the opening / closing operation of the lid with respect to the main body is provided between the lid and the main body. As this opening / closing mechanism, there is one using a damper in which upper and lower ends are rotatably supported by a lid and a main body as disclosed in JP-A-9-311389.
[0004]
In this damper, a cylinder in which the piston rubs is filled with liquid or gas, and a load is generated in the expansion and contraction operation by applying a flow resistance of the liquid or gas to the piston. By using such a damper for the opening / closing mechanism, a load is applied to the opening and closing operations of the lid with respect to the main body, the opening / closing speed of the lid is limited to a low speed, and the lid does not fall freely from the open position. Thus, it is possible to prevent the occurrence of a pinching accident, damage to the device, and occurrence of a failure.
[0005]
[Problems to be solved by the invention]
However, the damper used in the conventional opening / closing mechanism needs to be filled with a liquid or gas sealed in the cylinder, and the manufacturing operation is complicated and the structure must be complicated and expensive. There is a problem that costs rise.
[0006]
Further, the damper is configured such that a lever fixed to the piston is accommodated in the cylinder when the damper is contracted, and there is a limit to downsizing the cylinder. For this reason, a relatively large space for housing the damper is required in the opening / closing surface of the structure in a state where the lid is closed with respect to the main body, which causes a problem of increasing the size of the structure.
[0007]
Further, in a structure in which a lid having a relatively large mass can be opened and closed on the upper surface of the main body like an image forming apparatus in which the scanner unit can be opened and closed, a load is applied from the damper when the lid is opened. Since a large operating force is required to move the lid in the opening direction, there is a problem that the operability during work is lowered. This is a problem that similarly occurs when the lid is closed in a structure in which a lid having a relatively large mass is freely opened and closed on the bottom surface of the main body.
[0008]
It is an object of the present invention to limit the moving speed of the lid in the closing direction with a simple configuration, without requiring an expensive and large space, and to realize cost reduction and downsizing of the structure. Provided is an opening / closing mechanism capable of improving the operability when the lid is opened or closed with respect to the main body by preventing resistance from acting on the lid when the lid is opened or closed. There is.
[0009]
[Means for Solving the Problems]
The present invention has the following configuration as means for solving the above problems.
[0010]
(1) In an opening / closing mechanism that supports the lid so that it can be opened and closed with respect to the main body, a resistance generating member that generates resistance to the opening / closing operation of the lid and an operation in one of the opening / closing directions of the lid A switching member that cuts between the lid and the resistance generating member and connects the lid and the resistance generating member during the operation in the other direction in which the lid opens and closes ,
The switching member includes a rotating body that is rotated by engagement with a driving member provided on the main body side in accordance with the opening / closing operation of the lid body, and is rotatably supported in the vertical direction within a predetermined range on the lid body side. ,
The resistance generating member is a member that applies a braking force to a rotating body that has moved to an upper end or a lower end within a predetermined range in accordance with the opening and closing operation of the lid .
[0011]
In this configuration, the resistance force generated by the resistance force generating member acts on the lid only when the lid is opened or closed with respect to the main body. Therefore, when the lid body that opens and closes the top surface of the main body is closed or when the lid body that opens and closes the bottom surface of the main body is opened, the weight of the lid body acts in the movement direction of the lid body. When the resistance force is applied, the lid body does not fall freely. In addition, when the lid that opens and closes the top surface of the main body is opened or when the lid body that opens and closes the bottom surface of the main body is closed, the weight of the lid body acts in the direction opposite to the moving direction of the lid body. If no resistance force acts on the movement of the cover, it is not necessary to apply a force exceeding the weight of the lid in order to move the lid.
Further, when the lid is opened and closed, the rotating body rotates while moving up and down in the main body by engagement with the driving member, and moves to the upper end and the lower end of the lid within a predetermined range. A braking force is applied to the rotating body located at either the upper end or the lower end. Therefore, the long object does not rotate in the main body, and there is no need to provide a large space in the opening / closing surface of the main body. Further, when the braking force is applied to the rotating body located at either the upper end or the lower end of the predetermined range in a situation where the weight of the lid acts in the moving direction of the lid, the lid freely falls. There is nothing. Furthermore, when the braking force does not act on the rotating body located at either the lower end or the upper end of the predetermined range in a situation where the weight of the lid acts in the direction opposite to the moving direction of the lid, It is not necessary to apply a force that exceeds the weight of the lid in order to move it.
[0012]
(2) The rotating body moves to the lower end portion within the moving range by its own weight when the lid body is opened and is separated from the resistance generating member, and the upper end within the predetermined range is engaged with the driving member when the lid body is closed. It moves to a part and couple | bonds with a resistance supply member .
[0013]
In this configuration, the rotating body moves to the lower end and the upper end within a predetermined range due to the weight of the rotating body and the engagement between the rotating body and the driving member. Therefore, a member for coupling the rotating body to the resistance supply member is simply configured by the rotating body itself and the driving member.
[0014]
(3) The resistance generation member includes a movable body that is pressed against the friction body by the elastic force of the elastic body .
[0015]
In this configuration, a resistance force generating member is configured by the elastic body, the friction body, and the movable body, and the resistance force of the opening / closing operation is supplied to the lid body via the movable body that is pressed against the friction body by the elastic force of the elastic body. The Accordingly, the resistance force supplied to the lid body changes in accordance with the material of the friction body and the elastic force of the elastic body.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1A and 1B are a front view and a side view of a lid-side member constituting an opening / closing mechanism according to an embodiment of the present invention. FIG. 2 is an external view of a main body side member constituting the opening / closing mechanism. In this embodiment, an opening / closing mechanism applied to a structure having a lid on the upper surface of the main body that can be opened and closed will be described as an example. The opening / closing mechanism according to this embodiment includes a lid member 1 shown in FIG. 1 and a main body member 2 shown in FIG. The lid-side member 1 is formed by forming a bearing 12 at the upper end of a rod-shaped shaft 11 having a predetermined length in the vertical direction and forming a support 13 at the lower end.
[0019]
The bearing portion 12 is externally fitted to a shaft portion formed on the inner surface of the lid. Thus, the shaft body 11 is rotatably supported on the bottom surface of the lid body with the upper end portion as a fulcrum. In the space between two side surfaces parallel to each other, the support portion 13 includes a friction gear 14 (movable body), a friction plate 15 (friction body), and a spring 16 (elastic body) that constitute the resistance force generating member of the present invention. And the connection gear 17 which is the rotary body (switching member) of this invention is accommodated.
[0020]
The friction gear 14 is externally fitted to a shaft 14 a having both ends fixed to two side surfaces of the support portion 13, and the friction gear 14 is rotatable in the support portion 13 and movable in the direction of the rotation axis. A friction plate 15 is in contact with one side surface of the friction gear 14, and one end of a spring 16 is in pressure contact with the other side surface. As a result, the friction gear 14 is urged toward the friction plate 15 by the elastic force of the spring 16, and the friction gear 14 is subjected to a resistance force from the friction plate 15 against the rotation operation.
[0021]
Both ends of the rotating shaft 17a of the connecting gear 17 are fitted in the vertically elongated holes 18 formed on the two side surfaces of the support portion 13, and the connecting gear 17 is defined by the parallel portions of the elongated holes 18 in the support portion 13. It is movable and rotatable within a predetermined range in the vertical direction. The connecting gear 17 meshes with the friction gear 14 at the upper end position within a predetermined range. Note that both ends of the rotating shaft 17a pass through the long hole 18 from the inside and protrude by a predetermined amount to the outside of the two side surfaces of the support portion 13.
[0022]
The main body side member 2 is formed with a guide groove 22 and a rack gear 23 (corresponding to the driving member of the present invention) on the inner side surface of the casing 21 whose longitudinal direction is the vertical direction in which the transverse section exhibits a substantially U-shaped section. It is fixed to a predetermined position in the main body. That is, on the inner side surfaces of the two side surfaces parallel to each other in the casing 21 having a U-shaped cross section, the guide grooves 22 into which both ends of the rotating shaft 17a protruding from the side surface of the lid member 1 are fitted in the vertical direction. A rack gear 23 in which gears are arranged in the vertical direction is attached to the inner side surface of the rear surface sandwiched between the two side surfaces. In the upper end portion of the guide groove 22 where the groove width is increased, a holding portion 24 that holds the end portion of the rotating shaft 17a is formed.
[0023]
FIG. 3 is an external view of a main part showing an engagement state between the lid side member and the main body side member in the opening / closing mechanism. In the opening / closing mechanism according to this embodiment, the lower end portion of the lid member 1 enters the inside of the main body side member 2 from above, and both end portions of the rotary shaft 17a protruding outside the support portion 13 of the lid side member 1 are the main body. The lid side member 1 and the main body side member 2 are joined in a state of being fitted into a guide groove 22 formed on the inner side surface of the side surface of the side member 2. At this time, the connecting gear 17 of the lid member 1 meshes with the rack gear 23 of the main body member 2.
[0024]
With this configuration, the lid-side member 1 moves in the vertical direction relative to the main body-side member 2 by rubbing the end of the rotating shaft 17a in the guide groove 22 formed in the vertical direction. At this time, the connecting gear 17 meshing with the rack gear 23 rotates around the rotation shaft 17a.
[0025]
4 and 5 are views showing the operation of the opening / closing mechanism. FIGS. 4A and 4B are a side view and a front view showing the operating state of the opening / closing mechanism when the lid is opened, and FIG. (B) and (B) are a side view and a front view showing the operating state of the opening / closing mechanism when the lid is closed. As shown in FIG. 4, when the lid on the upper surface of the main body is opened, the lid side member 1 of the opening / closing mechanism moves upward as the lid moves upward, and the coupling gear 17 of the lid side member 1 is connected to the main body. The side member 2 rotates in the direction of arrow C while moving upward by meshing with the rack gear 23.
[0026]
At this time, both end portions of the rotating shaft 17a of the coupling gear 17 are movable in the vertical direction within a predetermined range within the long hole 18 in the support portion 13 of the lid-side member 1, and the coupling gear 17 has the rotating shaft. The upward movement force is transmitted from the lower end of the long hole 18 through both ends of 17a. That is, the coupling gear 17 starts to move upward after the rotating shaft 17a moves to the lower end portion of the long hole 18 due to its own weight and the meshing resistance from the rack gear 23, and while the lid side member 1 moves upward, Maintain state.
[0027]
Accordingly, the coupling gear 17 does not mesh with the friction gear 14 in the support portion 13, and is not subjected to the frictional resistance generated in the friction gear 14 by the friction plate 15 and the spring 16. Rotate in C direction. For this reason, a large load does not act on the upward movement of the lid member 1 when the lid is opened, and the lid can be opened with a relatively small force.
[0028]
On the other hand, as shown in FIG. 5, when the lid body is closed on the upper surface of the main body, the lid body side member 1 of the opening / closing mechanism moves downward as the lid body moves downward, and the coupling gear 17 of the lid body side member 1 is moved. Rotates in the direction of arrow D while moving downward by meshing with the rack gear 23 of the main body side member 2.
[0029]
At this time, in the support portion 13 of the lid member 1, the coupling gear 17 receives a downward movement force from the upper end portion of the long hole 18 through both end portions of the rotating shaft 17 a. That is, the coupling gear 17 starts to move downward after the rotating shaft 17a moves to the upper end of the long hole 18 due to the meshing resistance from the rack gear 23, and this state is maintained while the lid member 1 moves downward. maintain.
[0030]
Therefore, the coupling gear 17 meshes with the friction gear 14 in the support portion 13 and rotates in the arrow D direction in the support portion 13 in a state where the friction plate 15 and the spring 16 receive the frictional resistance generated in the friction gear 14. For this reason, a large load acts on the downward movement of the lid-side member 1 when the lid is closed, and the lid does not fall freely due to its own weight.
[0031]
As described above, when the lid on the upper surface of the main body is opened, the connecting gear 17 freely rotates in the lid side member 2 of the opening / closing mechanism, and the lid is opened with a relatively small force substantially equal to the force for lifting the lid. It is possible to open the lid easily. On the other hand, when the lid on the upper surface of the main body is closed, the frictional force of the friction member 15 acts as a braking force on the connecting gear 17 via the friction gear 14 in the lid side member of the opening / closing mechanism, and in addition to the weight of the lid, The lid cannot be closed unless a large force is applied, accidents in which a part of the operator's body is accidentally pinched between the lid and the main body, and damage to the internal devices of the main body and the lid. The occurrence of a failure can be prevented in advance.
[0032]
Further, the connection gear 17 is moved to the lower end portion and the upper end portion within a predetermined range by the weight of the connection gear 17 and the engagement between the connection gear 17 and the rack gear 23. For this reason, the member for meshing the connecting gear 17 with the friction gear 14 by the connecting gear 17 itself and the rack gear 23 can be simply configured, and the cost is not increased and the mechanism is not enlarged.
[0033]
6A to 6C are views showing the relationship between the lid-side member and the body-side member of the opening / closing mechanism when the lid is opened. FIG. 4A shows a state where the lid is closed with respect to the main body, FIG. 4B shows a state where the lid is opened with respect to the main body, and FIG. The state which the cover body opened completely with respect to the main body is shown.
[0034]
As shown in FIG. 2A, in the state where the upper surface of the main body 3 is closed by the lid body 4, both ends of the rotating shaft 17 a protruding from the lower end portion of the side surface of the lid body side member 1 are connected to the main body side member 2. It is located near the lower end of the guide groove 22. As described above, the bearing portion 12 formed at the upper end of the lid member 1 is rotatably attached to the shaft portion 41 formed on the inner surface on the open end side (front side) of the lid 4. It is fitted.
[0035]
When the lid body 4 is opened from the state shown in FIG. 5A with the back side as a hinge with respect to the upper surface of the main body 3, as shown in FIG. As the cover moves, the lid-side member 1 also moves upward, and both end portions of the rotating shaft 17a of the lid-side member 1 rise in the guide grooves 22 of the main body-side member 2. At this time, since the lid body 4 rotates with the back side as a fulcrum, the front side of the lid body 4 that pivotally supports the upper end of the lid side member 1 moves upward and moves to the back side.
[0036]
On the other hand, the main body side member 2 having the guide groove 22 with which the lower end portion of the lid side member 1 is engaged is fixed at a predetermined position in the main body 3. Therefore, the lid-side member 1 is inclined with the upper end portion on the back side as the lid 4 is opened. However, since the opening amount of the lid body 4 on the upper surface of the main body 3, that is, the rotation amount of the lid body 4 is small, the movement amount of the lid body 4 from the front side to the back side is relatively small. There is no need to provide a large space above the main body side member 2 for allowing the lid side member 1 to pass therethrough.
[0037]
Since the upper end of the guide groove 22 is closed in the main body side member 2, the movement of the lid body 4 in the opening direction is restricted by both end portions of the rotation shaft 17 a of the lid body side member 1 coming into contact with the upper end of the guide groove 22. Is done. Therefore, the opening amount of the lid 4 is determined by the length of the lid-side member 1 in the vertical direction. As described above, the groove width of the guide groove 22 is enlarged on the back side at the upper end portion, and the holding portion 24 is formed in this portion. For this reason, when the both ends of the rotating shaft 17a are in contact with the upper end of the guide groove 22, the lower end portion of the lid-side member 1 that is inclined with the upper end on the back side is moved in the guide groove 22 by its own weight. The both ends of the rotating shaft 17a abut on the upper surface of the holding portion 24, as shown in FIG. In this state, the lid member 1 is held substantially vertically, and the lid 4 is kept open.
[0038]
FIGS. 7A to 7D are views showing the relationship between the lid side member and the main body side member of the opening / closing mechanism when the lid is closed. FIG. 6A shows a state in which the lid is opened with respect to the main body, and FIGS. 6B and 6C show a state in which the lid is opened with respect to the main body. (D) has shown the state by which the cover body was fully open | released with respect to the main body.
[0039]
As shown in FIG. 3A, the lid 4 is closed from the open state of the lid 4 that is stopped by contacting the rotary shaft 17a on the holding member 24 formed at the upper end of the guide groove 22. In this case, the front side of the lid 4 is moved further upward from the state shown in FIG. As a result, as shown in FIG. 5B, the lid-side member 1 that is pivotally supported by the shaft portion 41 of the lid body 4 also moves upward in the bearing portion 12 at the upper end, and both end portions of the rotating shaft 17a are guided. The groove 22 moves to a space above the holding member 24 and does not contact the holding member 24.
[0040]
At this time, the front surface side of the lid body 4 that performs the rotation operation using the back surface side as a hinge moves upward while moving upward. For this reason, the upper end of the lid-side member 1 also moves to the back side in accordance with the displacement of the front side of the lid 4, and the lid-side member 1 is inclined with the upper end portion on the back side. In this state, the lower end of the lid member 1 where the rotating shaft 17a is no longer in contact with the holding member 24 moves the lower end to the back side by its own weight in order to maintain the vertical state of the lid member 1.
[0041]
Thereafter, when the force that lifts the lid 4 upward is released, the front side of the lid 4 moves to the front side while descending by a rotating operation using the back side by its own weight as a hinge. Along with this, the lid member 1 also moves to the front side while descending, and the rotating shaft 17a at the lower end portion of the lid member 1 is located behind the holding portion 24 in the guide groove 22 as shown in FIG. It moves to the front side of the guide groove 22 through the side and the lower side.
[0042]
Both end portions of the rotating shaft 17a reaching the front side of the guide groove 22 are exposed in the narrow portion formed in the vertical direction in the guide groove 22 and are not supported in the vertical direction. As a result, the both ends of the rotating shaft 17 a are moved down the front side of the lid body 4 until the lid body 4 completely closes the upper surface of the main body 3 as shown in FIG. Rub down the inside.
[0043]
With the above operation, in the opening / closing mechanism according to this embodiment, the rotation shaft 17a protruding to the lower end portion of the lid-side member 1 has the groove width expanded to the back side at the upper end portion of the guide groove 22 of the main body-side member 2. The open state of the lid body 4 can be reliably maintained by contacting the upper surface of the holding portion 24 formed in the portion, and the rotating shaft 17a is moved further upward from the open state. The contact state with respect to the holding portion 24 can be released to close the lid body 4.
[0044]
Further, the main body side member 2 is fixed inside the main body 3 with its longitudinal direction being the vertical direction, and the lid side member 1 extends from the upper surface of the main body side member 2 when the lid 4 is opened and closed with respect to the upper surface of the main body 3. The amount of output is designed to change. Therefore, the upper surface of the main body 3 that is opened and closed by the lid body 4 only needs to have a space having a shape and a size substantially equal to the cross section of the shaft body 11 of the lid body side member 1 above the main body side member 2. It is not necessary to provide a large space for housing the opening / closing mechanism on the upper surface of the main body 3, and the structure is not increased in size.
[0045]
In the above embodiment, the opening / closing mechanism applied to the structure in which the upper surface of the main body is opened and closed by the lid has been described as an example. However, the lid includes a lid that opens and closes the side or bottom of the main body. The opening / closing mechanism of the present invention can also be applied to a structure. However, when applied to a structure including a lid that opens and closes the side surface of the main body, it is necessary to change the shape of the holding portion in the guide groove of the main body side member. In addition, when applied to a structure having a lid that opens and closes the bottom surface of the main body, the coupling gear meshes with the friction gear when the lid is opened, and the coupling gear becomes the friction gear when the lid is closed. It is necessary to configure so as not to mesh. As a result, even in a structure including a lid that opens and closes the side surface or bottom surface of the main body, it is possible to prevent free fall due to the weight of the lid body, thereby preventing operator safety and damage to the device. Workability can be improved by preventing an increase in the force required to move the body in the direction opposite to the direction of gravity.
[0046]
【The invention's effect】
The present invention can achieve the following effects.
[0047]
(1) When the lid that opens and closes the top of the main unit is closed, or when the lid that opens and closes the bottom of the main unit is opened, the weight of the lid acts in the direction of movement of the lid. By applying the resistance force, the lid can be prevented from free falling, and an accident in which the operator's body is sandwiched between the lid and the main body and damage to the lid can be prevented. In addition, when the lid that opens and closes the top surface of the main body is opened or when the lid body that opens and closes the bottom surface of the main body is closed, the weight of the lid body acts in the direction opposite to the moving direction of the lid body. By preventing resistance from acting on the movement of the lid, it is not necessary to apply a force exceeding the weight of the lid in order to move the lid, and it is possible to prevent the workability of the lid opening / closing operation from deteriorating. .
Further, when the lid is opened and closed, the rotating body rotates while moving up and down in the main body by engagement with the driving member, and moves to the upper end and the lower end of the lid within a predetermined range. By applying braking force to the rotating body located at either the upper end or the lower end, long objects do not rotate in the main body, and it is not necessary to provide a large space in the open / close surface of the main body. Increase in size can be prevented. In addition, in a situation where the weight of the lid body acts in the direction of movement of the lid body, a free fall of the lid body is prevented by applying a braking force to the rotating body located at either the upper end or the lower end of the predetermined range. Thus, it is possible to prevent a pinching accident or damage to the lid. Further, in a situation where the weight of the lid body acts in the direction opposite to the movement direction of the lid body, the lid body is moved by not applying a braking force to the rotating body located at either the lower end or the upper end of the predetermined range. Therefore, it is not necessary to apply a force exceeding the weight of the lid body, and the operability of the lid body can be improved.
[0048]
(2) The rotating body is resisted by the rotating body itself and the driving member by moving the rotating body to the lower end and the upper end within a predetermined range by the weight of the rotating body and the engagement between the rotating body and the driving member. A member for coupling to the force supply member can be easily configured, and an increase in cost and an increase in the size of the mechanism can be prevented .
[0049]
(3) By forming a resistance generating member by the elastic body, the friction body and the movable body, and supplying the resistance force of the opening / closing operation to the lid body via the movable body pressed against the friction body by the elastic force of the elastic body Depending on the material of the friction body and the elastic force of the elastic body, the resistance force supplied to the lid can be increased or decreased, and an appropriate resistance according to the weight of the lid can be applied.
[Brief description of the drawings]
FIGS. 1A and 1B are a front view and a side view of a lid side member constituting an opening / closing mechanism according to an embodiment of the present invention. FIGS.
FIG. 2 is an external view of a main body side member constituting the opening / closing mechanism.
FIG. 3 is an external view of a main part showing an engagement state between a lid side member and a main body side member in the opening / closing mechanism.
FIGS. 4A and 4B are a side view and a front view showing an operating state of the opening / closing mechanism when the lid is opened. FIGS.
FIGS. 5A and 5B are a side view and a front view showing an operating state of the opening / closing mechanism when the lid is closed. FIGS.
FIG. 6 is a diagram showing a relationship between a lid side member and a main body side member of the opening / closing mechanism when the lid is opened.
FIG. 7 is a diagram illustrating a relationship between a lid side member and a main body side member of the opening / closing mechanism when the lid is closed.
[Explanation of symbols]
1-cover body side member material 2-main body side member 3-main body 4-lid body 11-shaft body 12-bearing portion 13-supporting portion 14-friction gear (movable body of resistance generating member)
15-friction plate (friction body of resistance generating member)
16-spring (elastic body of resistance generating member)
17-connection gear (rotating body of switching member)
22-Guide groove 23-Rack gear (drive member)
24-Holder

Claims (3)

本体に対して蓋体を開閉自在に支持する開閉機構において、蓋体の開閉動作に対する抵抗力を発生する抵抗力発生部材と、蓋体の開閉方向のいずれか一方向への動作中に蓋体と抵抗力発生部材との間を切断するとともに蓋体の開閉方向の残る他方向への動作中に蓋体と抵抗力発生部材との間を接続する切換部材と、を設け
前記切換部材が、蓋体の開閉動作にともなって本体側に設けられた駆動部材との係合によって回転するとともに蓋体側において所定範囲内で上下方向に移動自在に軸支された回転体を含み、
前記抵抗力発生部材が、蓋体の開閉動作にともなって所定範囲内の上端部又は下端部に移動した回転体に制動力を付与する部材であることを特徴とする開閉機構。
In an opening / closing mechanism that supports the lid so as to be freely opened and closed with respect to the main body, a resistance force generating member that generates resistance to the opening and closing operation of the lid, and the lid during the operation in one of the opening and closing directions of the lid And a switching member that connects between the lid and the resistance generating member during the operation in the other direction in which the lid opens and closes .
The switching member includes a rotating body that is rotated by engagement with a driving member provided on the main body side in accordance with the opening / closing operation of the lid body and is pivotally supported so as to be vertically movable within a predetermined range on the lid body side. ,
An opening / closing mechanism, wherein the resistance generating member is a member that applies a braking force to a rotating body that has moved to an upper end or a lower end within a predetermined range in accordance with an opening / closing operation of the lid .
前記回転体が、蓋体の開放時に自重によって移動範囲内の下端部に移動して抵抗力発生部材から離間し、蓋体の閉鎖時に駆動部材との係合によって所定範囲内の上端部に移動して抵抗力供給部材に結合することを特徴とする請求項1に記載の開閉機構。The rotating body moves to the lower end portion within the moving range by its own weight when the lid body is opened and moves away from the resistance generating member, and moves to the upper end portion within the predetermined range by engaging with the driving member when the lid body is closed. The opening / closing mechanism according to claim 1, wherein the opening / closing mechanism is coupled to the resistance supply member . 前記抵抗力発生部材が、弾性体の弾性力によって摩擦体に押圧される可動体を含むことを特徴とする請求項1又は2に記載の開閉機構。The opening / closing mechanism according to claim 1, wherein the resistance generating member includes a movable body that is pressed against the friction body by an elastic force of an elastic body .
JP2000080328A 2000-03-22 2000-03-22 Opening and closing mechanism Expired - Fee Related JP3628581B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007053736A (en) * 2005-07-21 2007-03-01 Canon Inc Image reading and recording apparatus
US8081352B2 (en) 2005-07-21 2011-12-20 Canon Kabushiki Kaisha Image reading/recording apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010039027A (en) * 2008-08-01 2010-02-18 Nifco Inc Opening and closing mechanism, image reading device, and image forming apparatus
TWI612399B (en) * 2016-05-10 2018-01-21 洪進興 Torque limiter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007053736A (en) * 2005-07-21 2007-03-01 Canon Inc Image reading and recording apparatus
US8081352B2 (en) 2005-07-21 2011-12-20 Canon Kabushiki Kaisha Image reading/recording apparatus

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