JP3915864B2

JP3915864B2 - Power transmission device and paper feeding device of recording apparatus

Info

Publication number: JP3915864B2
Application number: JP2000050598A
Authority: JP
Inventors: 泰康奥田; 清人小室
Original assignee: Seiko Epson Corp
Current assignee: Seiko Epson Corp
Priority date: 2000-02-28
Filing date: 2000-02-28
Publication date: 2007-05-16
Anticipated expiration: 2020-02-28
Also published as: JP2001240263A

Description

【０００１】
【発明の属する技術分野】
本発明は、プリンタ等の記録装置の動力伝達装置および給紙装置に係り、特に２軸間の動力伝達に遊星歯車機構を用い、２軸の正逆転または１軸のみの回転を行わせる動力伝達装置に関し、また本発明の動力伝達機構を記録装置に応用し、高精度の給紙制御を可能にした給紙装置に関する。
【０００２】
【従来の技術】
従来、ファクシミリ装置、複写機、プリンタ装置等の記録装置においては、複数枚の用紙を重ねて収納する給紙カセットが一般的に使用されており、この給紙カセットの上層側から1枚つづ用紙を給送し、記録を行っている。
記録装置は、給紙部、記録部、排紙部を備えており、給紙カセットから給送される用紙の記録部および排紙部への用紙搬送は高精度のモータ制御によって行われている。給紙を行う用紙搬送制御の一つには給紙ローラ、搬送ローラなどの駆動装置の機械的制御がある。単一のモータで給紙ローラと搬送ローラを駆動する給紙装置においては、各ローラの駆動軸ギアが伝達ギアやクラッチ機構を介在させてモータのピニオンギアに接続可能に構成されており、給紙シーケンスに従ってクラッチ機構のＯＮ−ＯＦＦにより各ローラへの動力伝達の断続を行っている。
【０００３】
【発明が解決しようとする課題】
ところで、モータにより第１の軸を駆動し、第１の軸から伝達ギアを介して第２の軸駆動ギアへ動力を伝え、第２の軸を回転させる動力伝達装置においては、第１の軸および第２の軸の正転、逆転および回転停止などの動作を行う駆動系を少数のギア群で構成し、かつ高信頼性が要求されている。
また、給紙装置においては、用紙を給紙ローラに押圧して給送する押圧パッドや先行する用紙に共連れし、給紙カセットから用紙搬送路に給送された次位の用紙を給紙カセットに戻す用紙戻し機構などの他の制御要素に関連させて給紙ローラの駆動制御が行われるので、上記の動力伝達装置を採用する場合は、構成の簡素化や紙ジャム除去などのメンテナンスの容易性が要求される。
【０００４】
本発明の目的は、装置の小型化を図ると共に、高信頼性のある記録装置の動力伝達装置を提供することにある。
本発明の他の目的は、簡素な構成により高精度の給紙性能が得られ、かつメンテナンスのし易い動力伝達装置を備えた給紙装置を提供することにある。
装置を提供することにある。
【０００５】
【課題を解決するための手段】
請求項１に記載の発明は、モータ駆動により正逆転する第１の軸と、該第１の軸から動力を得て正逆転する第２の軸と、第１の軸から第２の軸へ動力伝達を行う動力伝達手段と、を備えた記録装置の動力伝達装置において、前記動力伝達手段は、第１の軸上に配置された伝達ギアおよび該伝達ギアに接続された遊星ギアを有し、前記第１の軸の一方向回転時のみ前記第２の軸への動力伝達を行う遊星歯車機構と、前記第２の軸上に配置され、前記遊星ギアに接離される第２の軸駆動ギアとからなり、前記第２の軸駆動ギアと遊星ギアとの接続状態で動作可能になり、該接続状態を維持させるロック手段と、モータ駆動により前記ロック手段を操作し、前記第２の軸駆動ギアと遊星ギアとの接続状態の維持を解除する操作手段と、前記ロック手段を手動操作し、前記第２の軸駆動ギアと前記遊星ギアとの接続状態の維持を強制的に解除する第２の操作手段と、を備えていることを特徴とする。
請求項１に記載の発明によると、ロック手段により第２の軸駆動ギアと遊星ギアとの接続状態が維持されていないときは、第１の軸の一方向回転により遊星ギアが第２の軸駆動ギアに接続され、第１の軸の回転が第２の軸に伝達される。また第２の軸駆動ギアと遊星ギアが接続されているとき、ロック手段を動作させると該接続状態が維持される。このとき、第１の軸の双方向回転（正転または逆転）が第２の軸に伝達されるようになる。このように遊星歯車機構にロック手段を組み合わせることにより、第１の軸から第２の軸へ動力を伝達したり、伝達しないよう構成することができると共に、第２の軸駆動系のギア部品を少なくし、装置の小型化が図れる。
また、請求項１に記載の発明によると、保守点検等のサービスを行う際に、第１の軸と第２の軸が遊星機構によって連結されている場合は、第２の軸をフリーにして行う作業ができない。第２の操作手段を備えることで、第１の操作手段に関係なく、手動により第２の軸駆動ギアと遊星ギアとの接続状態の維持を強制的に解除することができる。すなわち、どのような状況下においても第１の操作手段か第２の操作手段のいずれかによって第２の軸をフリーにすることができるので、上記サービスがし易くなる。
【０００６】
請求項２に記載の発明に係る記録装置の動力伝達装置は、請求項１において、遊星歯車機構は、第１の軸に回動可能に支持され、遊星ギアを取付けた遊星レバーを有すると共に、ロック手段は遊星レバーを固定することを特徴とする。
請求項２に記載の発明によると、遊星レバーの形状は、ロック手段の構成部品を配置する場所に合わせ易いので、ロック手段の設計自由度を大きくすることができる。
【０００７】
請求項３に記載の発明に係る記録装置の動力伝達装置は、請求項１において、第２の軸上には、回動可能に支持され、自由端に係止部を有するストッパを配置すると共に、遊星歯車機構は第１の軸に回動可能に支持され、遊星ギアを取付けた遊星レバーを有し、該遊星レバーにはストッパの係止部が係止する係合部が設けられており、操作手段はストッパを回動させ、該ストッパの係止部と遊星レバーの係合部との係止および係止解除を行うストッパ操作レバーを有することを特徴とする。
請求項３に記載の発明によると、遊星レバーの支点より離れた位置でストッパを作用させているので、第２の軸駆動ギアと遊星ギアとの接続状態が確実に維持され、安定した動力伝達が可能となる。ストッパの支持を第２の軸を利用することで、構造の簡素化が図れる。
【０００８】
請求項４に記載の発明に係る記録装置の動力伝達装置は、請求項３において、ストッパ操作レバーは、第２の軸上に回動可能に支持されていることを特徴とする。
請求項４に記載の発明によると、第２の軸上にストッパとストッパ操作レバーを配置することで、同じ回動軌跡内でストッパ操作レバーが操作されるので、第２の軸駆動ギアと遊星ギアとの接続状態の維持またはその接続状態の維持解除を確実に行うことができる共に、ストッパとストッパ操作レバーの支持を共通な部材を利用することで、部品点数を減らして構造の簡素化が図れる。
【０００９】
請求項５に記載の発明に係る記録装置の動力伝達装置は、請求項２から４のいずれか１項において、操作手段は、ストッパ操作レバーに設けられたカムフォロアと、該カムフォロアが当接するカムを有するカム体と、該カム体を作動する駆動手段とからなることを特徴とする。
請求項５に記載の発明によると、ストッパ操作レバーの操作にカム機構を用いることで、操作系を小型化できかつ信頼性を向上させることができる。
【００１１】
請求項６に記載の発明は、モータ駆動により正逆転し、搬送ローラが設けられた搬送ローラ軸と、該搬送ローラ軸から動力を得て正逆転し、給紙ローラが設けられた給紙ローラ軸と、を備えた給紙装置において、前記搬送ローラ軸上に配置された伝達ギア、該伝達ギアに接続された遊星ギア、前記遊星ギアが取付けられた遊星レバーを有し、前記搬送ローラ軸の正転時のみ前記給紙ローラ軸への動力伝達を行う遊星歯車機構と、前記給紙ローラ軸上に配置され、前記遊星ギアが接離される給紙ローラ軸駆動ギアと、前記給紙ローラ軸上に回動可能に支持され、自由端に係止部を有し、該係止部が前記遊星レバーの係合部に係止され、前記給紙ローラ軸駆動ギアと遊星ギアとの接続状態を維持するストッパと、前記給紙ローラ軸上に回動可能に支持され、前記ストッパの係止部と前記遊星レバーの係合部との係止および係止解除を行うストッパ操作レバーを有する操作手段とを備え、前記ストッパの係止部と前記遊星レバーの係合部は、前記給紙ローラ軸駆動ギアと前記遊星ギアとの接続状態が維持されているときのみ係止可能になることを特徴とする。
請求項６に記載の発明によると、給紙ローラ軸上にストッパとストッパ操作レバーを配置することで、同じ回動軌跡内でストッパ操作レバーが操作されるから、給紙ローラ軸駆動ギアと遊星ギアとの接続状態の維持またはその接続状態の維持解除を確実に行うことができる共に、ストッパとストッパ操作レバーの支持を共通な部材を利用することで、部品点数を減らして構造を簡素化し、その結果小型化が図れる。
【００１２】
また、請求項６に記載の発明によると、給紙ローラが正転可能状態になっているときのみストッパの係止部が遊星レバーの係合部に係止できる。すなわち、給紙ローラ軸駆動ギアと遊星ギアとの接続状態が維持されているとき、給紙ローラの正逆転に必要な動力伝達が行われる。
【００１３】
請求項７に記載の発明は、モータ駆動により正逆転し、搬送ローラが設けられた搬送ローラ軸と、該搬送ローラ軸から動力を得て正逆転し、給紙ローラが設けられた給紙ローラ軸と、を備えた給紙装置において、前記搬送ローラ軸上に配置された伝達ギア、該伝達ギアに接続された遊星ギア、前記遊星ギアが取付けられた遊星レバーを有し、前記搬送ローラ軸の正転時のみ前記給紙ローラ軸への動力伝達を行う遊星歯車機構と、前記給紙ローラ軸上に配置され、前記遊星ギアが接離される給紙ローラ軸駆動ギアと、前記給紙ローラ軸上に回動可能に支持され、自由端に係止部を有し、該係止部が前記遊星レバーの係合部に係止され、前記給紙ローラ軸駆動ギアと遊星ギアとの接続状態を維持するストッパと、前記給紙ローラ軸上に回動可能に支持され、前記ストッパの係止部と前記遊星レバーの係合部との係止および係止解除を行うストッパ操作レバーを有する操作手段とを備え、前記遊星レバーは、前記搬送ローラ軸に回動可能に支持されされていることを特徴とする。
請求項７に記載の発明によると、遊星レバーの支点より離れた位置でストッパを作用させているので、給紙ローラ軸駆動ギアと遊星ギアとの接続状態が確実に維持され、安定した動力伝達が可能となる。また、遊星レバーの支持を搬送ローラ軸を利用することで支持部材を減らし構成が簡素される。
【００１４】
請求項８に記載の発明に係る給紙装置は、モータ駆動により正逆転し、搬送ローラが設けられた搬送ローラ軸と、該搬送ローラ軸から動力を得て正逆転し、給紙ローラが設けられた給紙ローラ軸と、を備えた給紙装置において、前記搬送ローラ軸上に配置された伝達ギア、該伝達ギアに接続された遊星ギア、前記遊星ギアが取付けられた遊星レバーを有し、前記搬送ローラ軸の正転時のみ前記給紙ローラ軸への動力伝達を行う遊星歯車機構と、前記給紙ローラ軸上に配置され、前記遊星ギアが接離される給紙ローラ軸駆動ギアと、前記給紙ローラ軸上に回動可能に支持され、自由端に係止部を有し、該係止部が前記遊星レバーの係合部に係止され、前記給紙ローラ軸駆動ギアと遊星ギアとの接続状態を維持するストッパと、前記給紙ローラ軸上に回動可能に支持され、前記ストッパの係止部と前記遊星レバーの係合部との係止および係止解除を行うストッパ操作レバーを有する操作手段とを備え、前記操作手段は、ストッパ操作レバーに設けられたカムフォロアと、該カムフォロアが当接する環状の溝カムを有するホイールと、を備え、前記ホイールは、前記給紙ローラに共動させる部材が配置されたレリース軸上に配置され、該レリース軸の所定角度の回転により前記ストッパ操作レバーを回動させることを特徴とする。
請求項８に記載の発明によると、給紙ローラに共動させる部材、例えば給紙従動ローラ、押圧パッド、用紙戻しレバーなどの動作制御はレリース軸の回転によって行われる。レリース軸上にホイールを配置することで、給紙ローラに共動させる部材に関連して給紙ローラへの動力伝達の制御が可能となる。このようにホイールの動力をレリース軸から得ることで、ホイールの為の独立したモータが不要となり、その分小型化かつ省エネ効果が期待できる。
【００１５】
請求項９に記載の発明に係る給紙装置は、モータ駆動により正逆転し、搬送ローラが設けられた搬送ローラ軸と、該搬送ローラ軸から動力を得て正逆転し、給紙ローラが設けられた給紙ローラ軸と、を備えた給紙装置において、前記搬送ローラ軸上に配置された伝達ギア、該伝達ギアに接続された遊星ギア、前記遊星ギアが取付けられた遊星レバーを有し、前記搬送ローラ軸の正転時のみ前記給紙ローラ軸への動力伝達を行う遊星歯車機構と、前記給紙ローラ軸上に配置され、前記遊星ギアが接離される給紙ローラ軸駆動ギアと、前記給紙ローラ軸上に回動可能に支持され、自由端に係止部を有し、該係止部が前記遊星レバーの係合部に係止され、前記給紙ローラ軸駆動ギアと遊星ギアとの接続状態を維持するストッパと、前記給紙ローラ軸上に回動可能に支持され、前記ストッパの係止部と前記遊星レバーの係合部との係止および係止解除を行うストッパ操作レバーを有する操作手段とを備え、手動操作により前記ストッパの係止部と前記遊星レバーの係合部との係止を強制的に係止解除する第２の操作手段を備えていることを特徴とする。
請求項９に記載の発明によると、保守点検等のサービスを行う際に、搬送ローラ軸と給紙ローラ軸が遊星機構によって連結されている場合は、給紙ローラ軸をフリーにして行う作業ができない。第２の操作手段を備えることで、第１の操作手段に関係なく、手動により給紙ローラ軸駆動ギアと遊星ギアとの接続状態の維持を解除することができる。すなわち、どのような状況下においても第１の操作手段か第２の操作手段のいずれかによって第２の軸をフリーにすることができるので、上記サービスがし易くなる。
【００１６】
請求項１０に記載の発明に係る給紙装置は、請求項９において、第２の操作手段は、カバー部材の開動作により強制的に前記係止解除が行われることを特徴とする。請求項１０に記載の発明によると、第２の操作手段をカバー部材の開閉に連動させているので、給紙ローラを確実にフリーにすることができるから、カバー部材を開けたときに給紙ローラ軸駆動ギアと遊星ギアとの接続状態の確認が不要となり、メンテナンス作業がし易くなる。
【００１７】
請求項１１に記載の発明に係る給紙装置は、請求項９または１０において、ストッパとストッパ操作レバーとの間を連結するスプリングを設け、該スプリングの張力により互いに突き当て状態で一体化すると共に、ストッパの係止部と遊星レバーの係合部との係止状態から係止解除する方向へスプリングの張力に抗してストッパが回動可能に設けられており、第２の操作手段にはストッパを前記方向に操作するスライダが備えられていることを特徴とする。請求項１１に記載の発明によると、ストッパ操作レバーが拘束されている場合や正規位置にない場合などにおいても第２の操作手段からストッパを操作することができるので、例えばジャム紙の除去など給紙ローラと搬送ローラを切離さないとできない作業に有効である。
【００１８】
請求項１２に記載の発明に係る給紙装置は、請求項１１において、第２の操作手段がストッパの係止部と遊星レバーの係合部との係止を強制的に係止解除した後に、その解除前の状態に戻してから搬送ローラ軸を正転させた時に、遊星レバーの回動およびスプリングの張力によるストッパの回動によりストッパの係止部と遊星レバーの係合部との係止を行わせることを特徴とする。請求項１２に記載の発明によると、第２の操作手段を働かせたときには、その後の搬送ローラ軸の正転時においてストッパの係止部と遊星レバーの係合部との係止を行わせるので、続く給紙制御の為のイニシャライズが正確にできる。
【００１９】
請求項１３に記載の発明に係る記録装置は、請求項６から１２のいずれか１項の給紙装置を備えていることを特徴とする。請求項１３に記載の発明によると、小型化でき、かつ高精度の給紙性能を持った記録装置が実現できる。
【００２０】
【発明の実施の形態】
本願発明の実施の形態を説明する。図１は本発明に係る動力伝達装置を適用したプリンタ装置のカバーを外した正面側から見た斜視図、図２は図１のプリンタ装置の背面側から見た斜視図、図３は給紙部の平面図、図４はプリンタ装置における給紙装置の模式図である。
【００２１】
先ず、プリンタ装置の概略を説明する。プリンタ装置１は、装置本体の正面側に給紙カセット挿込口２Ａが設けられた給紙カセット装着部２を備え、給紙カセット挿込口２Ａから複数枚の用紙Ｐを重ねて収納した給紙カセット２０が挿入装着される。底フレーム４０に立設された主フレーム１１０には、記録ヘッド１２を搭載したキャリッジ１１１を主走査方向に移動可能に支持する主軸１１２、キャリッジ１１１を駆動するモータ１１３やベルト１１４からなるキャリッジ駆動部１１５、用紙Ｐの搬送部１１６、装置本体の後方に給紙部１１７、記録ヘッド１２のクリーニングやインク吸引などの保守を行うためのキャリッジホームホジション１１８が設けられている。
【００２２】
給紙カセット装着部２には、給紙カセット挿込口２Ａ側の底フレーム４０に回転支点３ａを有する押し板操作レバー３が給紙ローラ６の近傍まで伸びて配設されており、この押し板操作レバー３はスプリング３ｃにより給紙ローラ６側に付勢されている。レリース軸４に取り付けられたカム体５のカム５ａが押し板操作レバー３に設けられたカムフォロア３ｂに作用すると、押し板操作レバー３は給紙カセット２０の底板部２２に回転支点２１ａを有する押し板２１を、用紙Ｐの給紙毎に上方へ押し上げた位置（給紙状態：図４の実線で示す位置）と該位置から下方へ押し下げた位置（非給紙状態：図４の２点鎖線で示す位置）に作動させる。
【００２３】
給紙部１１７は、平行配置されたレリース軸４と給紙ローラ軸６ａを有し、給紙ローラ軸６ａ上には複数個の給紙ローラ６が設けられており、一方レリース軸４上には分離パッド６Ｂおよび分離パッド作動機構からなる分離パッドユニット６１、給紙従動ローラ６Ｃおよび給紙従動ローラ進退機構からなる給紙従動ローラユニット６２、用紙戻しレバー６Ｄおよび用紙戻しレバー作動機構からなる用紙戻しユニット６３、後述の動力伝達装置７０を構成するホイール７１が配置されている。
【００２４】
給紙スタートによりレリース軸４と給紙ローラ軸６ａが回転すると、始めに用紙戻しレバー６Ｄの回動により先行した用紙Ｐに共連れして給送された次位の用紙を給紙カセット２０内に押し戻す。そして、分離パッド６Ｂ、給紙従動ローラ６Ｃが給紙ローラ６に押し付けられると共に、押し板２１が操作レバー３によって給紙ローラ６側に押し上げられ、上層側の用紙先端が紙分離用補助ローラ６Ａに押し付けられる。
【００２５】
給紙カセット２０の上層側の用紙Ｐは、紙分離用補助ローラ６Ａにより１枚つづ分離され、給紙ローラ６により給送され、紙ガイドローラ７や紙案内部８にガイドされ、紙検知器９によって紙検知が行われ、搬送ローラ１０と従動ローラ１１から成る搬送部１１６に送られる。続いて、紙検知に基づいて搬送ローラ１０の駆動制御を行って用紙Ｐのスキュー取りおよび頭出しを行い、記録タイミングに合わせて記録ヘッド１２とプラテン１３から成る記録域へ搬送し、用紙Ｐに印字が行われて排出される。
【００２６】
上述のプリンタ装置に適用された本発明に係る動力伝達装置を詳しく説明する。図５は本発明の動力伝達装置の展開図、図６は図５のＩ−Ｉ矢視図である。なお、本発明の動力伝達装置を構成する要素として、第１の軸は搬送ローラ軸、第２の軸は給紙ローラ軸に対応する。
【００２７】
主モータ７２は、中間ギア群７２ａを介して搬送ローラ軸１０ａ上の搬送ローラ駆動ギア７２ｂを回転させ、搬送ローラ１０を駆動すると共に、搬送ローラ軸１０ａ上の伝達ギア７２ｃと遊星ギア７２ｄからなる遊星ギア機構７３を介して給紙ローラ軸６ａ上の給紙ローラ駆動ギア７２ｅを回転させ、給紙ローラ６を駆動する。レリース軸４上には、ホイール７１が配置され、その側面に環状の溝カム７１ａが形成されている。ホイール７１の溝カム７１ａにストッパ操作レバー７４のカムフォロア７４ａが当接されている。
【００２８】
ストッパ操作レバー７４の基部７４ｂは、給紙ローラ軸６ａに回動可能に支持されており、ホイール７１の回転によりストッパ操作レバー７４を所定の角度範囲で回動させる。給紙ローラ軸６ａには、ストッパ操作レバー７４に連係されたストッパ７５が回動可能に支持されている。ストッパ７５は、給紙ローラ駆動ギア７２ｅの両側方の給紙ローラ軸６ａに配置された一対のストッパアーム７５ａ、７５ｂと、このストッパアーム７５ａ、７５ｂの自由端において両アームを連結すると共に、遊星レバー７３ａに係止する係止部となるロックバー７５ｃからなっている。
【００２９】
図７において、ストッパ操作レバー７４とストッパ７５との間にはスプリング７６が張設されており、互いに回動したとき所定の角度で突き当たるレバー規制部７４ｂとストッパ規制部７５ｄが設けられている。レバー規制部７４ｂおよびストッパ規制部７５ｄは、スプリング７６により互いに突き当たる方向に付勢されている。通常、スプリング７６の作用によってレバー規制部７４ｂとストッパ規制部７５ｄの突き当て状態で一体的に回動する（図７（１））。後述のストッパ７５と遊星レバー７３ａとの係止を強制的に係止解除するとき、図７（２）に示す如く、矢印方向へストッパ７５のみをスプリング７６の張力に抗して回動させることができる。
【００３０】
遊星ギア機構７３は、図８に示すように搬送ローラ軸１０ａに回動可能に支持された遊星レバー７３ａを有し、この遊星レバー７３ａに伝達ギア７２ｃに噛み合った遊星ギア７２ｄが配設されている。遊星レバー７３ａの先端（自由端）は、給紙ローラ軸６ａと交差する位置まで延びており、その交差部分に切欠き部７３０およびストッパ７５のロックバー７５ｃの移動域に延びた部分に山形に切除されたロックバー係合部７３１が形成されている。遊星レバー７３ａの自由端側の端面は、円弧面７３２となっており、ロックバー係合部７３１に近い円弧面７３２は、ロックバー７５ｃの胴当て部分となる。
【００３１】
図９（１）に示す搬送ローラ軸１０ａの正転時には、遊星レバー７３ａが矢印方向に回動し、切欠き部７３０の下側面７３３が給紙ローラ軸６ａに当接することによって回動規制され、遊星ギア７２ｄと給紙ローラ駆動ギア７２ｅが接続状態で維持される為、伝達ギア７２ｃの回転は給紙ローラ軸６ａに伝えられる回転可能状態となる。一方、図９（ｂ）に示す搬送ローラ軸１０ａの逆転時には、遊星レバー７３ａが矢印方向に回動し、遊星ギア７２ｄと給紙ローラ駆動ギア７２ｅの接続を切離し、給紙ローラ軸６ａは非回転状態になる。
【００３２】
リアカバー１２０の開閉に連動して遊星レバー７３ａと遊星レバーストッパ７５との係止を強制的に係止解除する機構について説明する。リアカバー１２０は、図２に示すようにリアフレーム１１０ａに設けられたカバー取付け部１２１にカバー軸１２０ａが支持され、プリンタ本体後方に起倒自在に設けられている。リアカバー１２０から側方にかつカバー軸１２０ａから所定距離にボス１２０ｂが突設されている。
【００３３】
プリンタ本体側には、給紙ローラ軸６ａを横切る方向に移動可能なスライダ７７が配置されている。スライダ７７の一端は、リアフレーム１１０ａを貫通し、その突出部分に角穴７７ａが形成されており、この角穴７７ａにリアカバー１２０のボス１２０ｂが連係されている。スライダ７７の他端側は、Ｌ字形状になっており、その先端は給紙ローラ駆動ギア７２ｅのほぼ下方に達している。
【００３４】
図１０および図１１において、スライダ７７の先端は、遊星レバー７３ａとストッパアーム７５ｂとの間に延びており、ストッパ７５のロックバー７５ｃを押す為の面を有する押圧部７７ｂが立設されている。リアカバー１２０を開けると、スライダ７７は図１２に示す矢印方向へ移動し、押圧部７７ｂが図１２に示すようにロックバー７５ｃを遊星レバー７３ａから離れる方向へ押し、ロックバー７５ｃとロックバー係合部７３１との係止を解除し、遊星レバー７３ａが図１１の係止状態から図１２の係止解除状態になる。
【００３５】
上記実施例の作用を説明する。通常の給紙動作を行う場合、搬送ローラ軸１０ａを正転させると、遊星レバー７３ａは、図１３に示すように矢印方向に回動する力を受け、遊星ギア７２ｄと給紙ローラ駆動ギア７２ｅを接続し給紙ローラ軸６ａを正転させる。この動作により用紙の給送が行われる。搬送ローラ軸１０ａを逆転させると、遊星レバー７３ａは、図１４に示すように矢印方向に回動する力を受け、遊星ギア７２ｄと給紙ローラ駆動ギア７２ｅの接続を切離し、給紙ローラ軸６ａは回転しない。この動作は、例えば搬送ローラ６に到達した用紙に対し、給紙ローラ６の回転を止め、搬送ローラ１０を逆転させてスキュー取りを行う操作に利用される。
【００３６】
次に給紙ローラ６を正逆転させて給紙動作を行う場合、レリース軸４を１／４回転させると、ホイール７１は、図１５に示す位置になり、ストッパ操作レバー７４を矢印方向に回動させる。ストッパ操作レバー７４のカムフォロア７４ａが溝カム７１ａに沿って動くと、スプリング７６を介してストッパ７５を引張り、ストッパ操作レバー７４と同じ方向に回動しようとするが、ロックバー７５ｃが遊星レバー７３ａの端面７３２に突き当たり回動が阻まれ、図示の位置にある。続いて、搬送ローラ軸６ａを逆転させると、図１６において、遊星レバー７３ａは矢印方向に回動し、遊星ギア７２ｄと給紙ローラ駆動ギア７２ｅを接続すると共に、スプリング７６によって付勢されていたストッパ７５が矢印方向に回動し、図１７に示すようにロックバー７５ｃがロックバー係止部７３１に係止して遊星レバー７３ａを係止状態（ロック）する。遊星レバー７３ａが係止状態になると、搬送ローラ軸１０ａの正転時には給紙ローラ軸６ａを正転させ、一方搬送ローラ軸１０ａの逆転時には給紙ローラ軸６ａを逆転させることができる。この動作は、先行する用紙に共連れされて搬送路中に給送されている用紙を給紙カセットやホッパに戻す動作として利用できる。この状態からホームホジションに戻す場合、ホイール７１を１／４回転させると、図１８に示すようにストッパ操作レバー７４が回動する過程において、レバー規制部７４ｂが遊星レバーストッパ７５のストッパ規制部７５ｄを押してロックバー７５ｃによる遊星レバー７３ａの係止を解除し、図１３の状態になる。
【００３７】
次に紙ジャム解除等の給紙部のメンテナンス時の操作について説明する。図１９において、リアカバー１２０を開けると、スライダ７７が移動する。例えば、図１７に示す遊星レバー７３ａが係止状態の場合、上記スライダ７７の移動により係止が解除される。給紙ローラ６を正転させてジャム紙を取り除く。このときの給紙ローラ６の正転により遊星レバー７３ａは、図２０に示す矢印方向に回動し、遊星ギア７３ｄと給紙ローラ駆動ギア７２ｅの接続が切離される。その後、リアカバー１２０を閉じると、先の開くときとは逆向きにスライダ７７が移動し、ロックバー７５ｃが遊星レバー７３ａの前端に突き当たって止まる。これ以降の動作は、図１６に示す状態の動作と同じになるので、その説明は省略する。
【００３８】
【発明の効果】
本発明に係る記録装置の動力伝達装置によれば、第１の軸から第２の軸への動力伝達状態にある遊星歯車機構をロックするロック手段を設け、このロック手段の操作により第１の軸から第２の軸へ双方向回転の動力を伝達したり、伝達しないよう構成することができると共に、第２の軸駆動系のギア部品を少なくし、装置の小型化が図れる。
【００３９】
本発明に係る給紙装置によれば、遊星レバーの支点より離れた位置でストッパを作用させているので、給紙ローラ軸駆動ギアと遊星ギアとの接続状態が確実に維持され、安定した動力伝達が可能となる。給紙ローラ軸上にストッパとストッパ操作レバーを配置することで、同じ回動軌跡内でストッパ操作レバーが操作されるから、給紙ローラ軸駆動ギアと遊星ギアとの接続状態の維持またはその接続状態の維持解除を確実に行うことができる共に、ストッパとストッパ操作レバーの支持を共通な部材を利用し、更に給紙ローラ軸駆動系のギア部品を少なくして構造を簡素化し、その結果装置の小型化が図れる。
【図面の簡単な説明】
【図１】本発明に係る動力伝達装置を適用したプリンタ装置のカバーを外した正面側から見た斜視図である。
【図２】図１のプリンタ装置の背面側から見た斜視図である。
【図３】給紙部の平面図である。
【図４】プリンタ装置における給紙装置の模式図である。
【図５】本発明の動力伝達装置の展開図である。
【図６】図５のＩ−Ｉ矢視図である。
【図７】ストッパ操作レバーとストッパの関係を示し、（１）は一体化構造、（２）はストッパのみが回動したときの説明図である。
【図８】遊星歯車機構の正面図である。
【図９】遊星歯車機構の動作を示し、（１）は正転時、（２）は逆転時の説明図である。
【図１０】カバー部材の開動作によってストッパと遊星レバーとの係止を解除する説明図である。
【図１１】図１０の係止解除前の説明図である。
【図１２】図１０の係止解除後の説明図である。
【図１３】通常の正転時の説明図である。
【図１４】通常の逆転時の説明図である。
【図１５】ホイール作動時の説明図である。
【図１６】ストッパと遊星レバーとの係止動作の説明図である。
【図１７】正逆転の説明図である。
【図１８】ストッパと遊星レバーとの係止状態から係止解除動作の説明図である。
【図１９】カバー部材の開動作に連動させた、ストッパと遊星レバーとの係止解除動作の説明図である。
【図２０】図１９の係止解除後の遊星ギアと給紙ローラ軸駆動ギアとの接続を切離す操作の説明図である。
【符号の説明】
１プリンタ装置
４レリース軸
６給紙ローラ
６ａ給紙ローラ軸（第２の軸）
１０搬送ローラ
１０ａ搬送ローラ軸（第１の軸）
２０給紙カセット
７０動力伝達装置
７１溝カム付きホイール
７３遊星歯車機構
７３ａ遊星レバー
７４ストッパ操作レバー
７５ストッパ
７７スライダ
１１１キャリッジ
１１７給紙部
１２０リアカバー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power transmission device and a paper feeding device of a recording apparatus such as a printer, and in particular, uses a planetary gear mechanism for power transmission between two axes, and performs power transmission that performs forward / reverse rotation of two axes or rotation of only one axis. The present invention also relates to an apparatus, and more particularly, to a sheet feeding apparatus that enables high-precision sheet feeding control by applying the power transmission mechanism of the present invention to a recording apparatus.
[0002]
[Prior art]
Conventionally, in a recording apparatus such as a facsimile machine, a copying machine, a printer apparatus, etc., a paper feed cassette that stores a plurality of papers in a stacked manner is generally used. Is feeding and recording.
The recording apparatus includes a paper feed unit, a recording unit, and a paper discharge unit, and paper conveyance from the paper feed cassette to the recording unit and paper discharge unit is performed by high-precision motor control. . One of the sheet conveyance controls for feeding paper is mechanical control of driving devices such as a sheet feeding roller and a conveyance roller. In a paper feed device that drives a paper feed roller and a transport roller with a single motor, the drive shaft gear of each roller can be connected to the pinion gear of the motor via a transmission gear and a clutch mechanism. According to the paper sequence, the power transmission to each roller is interrupted by turning on and off the clutch mechanism.
[0003]
[Problems to be solved by the invention]
By the way, in the power transmission device that drives the first shaft by the motor, transmits power from the first shaft to the second shaft driving gear via the transmission gear, and rotates the second shaft, the first shaft A drive system that performs operations such as forward rotation, reverse rotation, and rotation stop of the second shaft is constituted by a small number of gear groups, and high reliability is required.
Also, in the paper feeding device, the paper of the next level fed from the paper feed cassette to the paper transport path is fed together with the pressure pad that feeds the paper by pressing the paper against the paper feed roller and the preceding paper. Since the drive control of the paper feed roller is performed in relation to other control elements such as a paper return mechanism for returning to the cassette, when adopting the power transmission device described above, maintenance such as simplification of configuration and paper jam removal is performed. Ease is required.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a power transmission device for a recording apparatus that is highly reliable while miniaturizing the apparatus.
Another object of the present invention is to provide a paper feeding device provided with a power transmission device that can obtain highly accurate paper feeding performance with a simple configuration and is easy to maintain.
To provide an apparatus.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, a first shaft that rotates forward and backward by driving a motor, a second shaft that receives power from the first shaft and rotates forward and backward, and a first shaft to a second shaft. And a power transmission device for a recording apparatus, wherein the power transmission device includes a transmission gear disposed on the first shaft and a planetary gear connected to the transmission gear. A planetary gear mechanism that transmits power to the second shaft only during one-way rotation of the first shaft, and a second shaft drive that is disposed on the second shaft and is contacted and separated by the planetary gear And a lock means that is operable in a connected state of the second shaft drive gear and the planetary gear, and operates the lock means by driving the motor to operate the second shaft. Operating means for releasing the connection state between the drive gear and the planetary gear; The manually operated, characterized in that it comprises a second operating means for forcibly releasing the maintenance of connection state and the second shaft driving gear the planetary gear.
According to the first aspect of the present invention, when the connection state between the second shaft driving gear and the planetary gear is not maintained by the locking means, the planetary gear is moved to the second shaft by one-way rotation of the first shaft. Connected to the drive gear, the rotation of the first shaft is transmitted to the second shaft. When the second shaft drive gear and the planetary gear are connected, the connected state is maintained when the lock means is operated. At this time, bidirectional rotation (forward rotation or reverse rotation) of the first shaft is transmitted to the second shaft. In this way, by combining the planetary gear mechanism with the locking means, it is possible to transmit power from the first shaft to the second shaft or not to transmit it, and to provide gear parts for the second shaft drive system. The number of devices can be reduced and the device can be downsized.
According to the first aspect of the present invention, when the first shaft and the second shaft are connected by a planetary mechanism when performing maintenance and inspection services, the second shaft is freed. I can't do it. By providing the second operation means, the maintenance of the connection state between the second shaft drive gear and the planetary gear can be forcibly released manually regardless of the first operation means. That is, in any situation, the second axis can be freed by either the first operating means or the second operating means, so that the service is facilitated.
[0006]
A power transmission device for a recording apparatus according to a second aspect of the present invention is the power transmission device of the recording device according to the first aspect, wherein the planetary gear mechanism is rotatably supported on the first shaft and has a planetary lever to which the planetary gear is attached. The locking means fixes the planetary lever.
According to the second aspect of the present invention, the shape of the planetary lever can be easily matched with the place where the components of the locking means are arranged, so that the degree of freedom in designing the locking means can be increased.
[0007]
A power transmission device for a recording apparatus according to a third aspect of the present invention is the power transmission device for a recording apparatus according to the first aspect, wherein a stopper that is rotatably supported on the second shaft and has a locking portion at a free end is disposed. The planetary gear mechanism is rotatably supported on the first shaft and has a planetary lever to which a planetary gear is attached, and the planetary lever is provided with an engaging portion for engaging a stopper engaging portion. The operating means has a stopper operating lever for rotating the stopper and locking and releasing the locking portion of the stopper and the engaging portion of the planetary lever.
According to the invention of claim 3, since the stopper is operated at a position away from the fulcrum of the planetary lever, the connection state between the second shaft drive gear and the planetary gear is reliably maintained, and stable power transmission is achieved. Is possible. By using the second shaft for supporting the stopper, the structure can be simplified.
[0008]
According to a fourth aspect of the present invention, there is provided a power transmission device for a recording apparatus according to the third aspect, wherein the stopper operating lever is rotatably supported on the second shaft.
According to the fourth aspect of the present invention, since the stopper operating lever is operated within the same rotation locus by arranging the stopper and the stopper operating lever on the second shaft, the second shaft driving gear and the planetary gear are operated. The connection state with the gear can be maintained and the connection state can be maintained and released reliably, and the stopper and the stopper operating lever can be supported using a common member, reducing the number of parts and simplifying the structure. I can plan.
[0009]
According to a fifth aspect of the present invention, in the power transmission device for a recording apparatus according to any one of the second to fourth aspects, the operating means includes a cam follower provided on the stopper operating lever and a cam with which the cam follower abuts. And a driving means for operating the cam body.
According to the invention described in claim 5, by using the cam mechanism for the operation of the stopper operating lever, the operating system can be reduced in size and the reliability can be improved.
[0011]
According to a sixth aspect of the present invention, there is provided a transport roller shaft provided with a transport roller by forward / reverse rotation by a motor drive, and a paper feed roller provided with a paper feed roller that rotates forward and backward by obtaining power from the transport roller shaft. A transmission gear disposed on the conveyance roller shaft, a planetary gear connected to the transmission gear, a planetary lever to which the planetary gear is attached, and the conveyance roller shaft A planetary gear mechanism that transmits power to the paper feed roller shaft only during normal rotation, a paper feed roller shaft drive gear that is disposed on the paper feed roller shaft and that contacts and separates the planetary gear, and the paper feed roller The shaft is rotatably supported on the shaft, has a locking portion at the free end, the locking portion is locked to the engaging portion of the planetary lever, and the connection between the feeding roller shaft driving gear and the planetary gear. Stopper that maintains the state and can be rotated on the paper feed roller shaft And an operating means having a stopper operating lever for engaging and releasing the engaging portion of the stopper and the engaging portion of the planetary lever, and engaging the engaging portion of the stopper and the planetary lever. The joining portion can be locked only when the connection state between the paper feed roller shaft driving gear and the planetary gear is maintained.
According to the invention described in claim 6, since the stopper and the lever operating lever are operated on the same rotation locus by disposing the stopper and the stopper operating lever on the paper feeding roller shaft, the paper feeding roller shaft driving gear and the planetary gear are operated. While maintaining the connection state with the gear or maintaining and releasing the connection state can be performed reliably, the structure is simplified by reducing the number of parts by using a common member to support the stopper and the stopper operation lever. As a result, the size can be reduced.
[0012]
According to the sixth aspect of the invention, the stopper locking portion can be locked to the planetary lever engaging portion only when the paper feed roller is in a forward-rotatable state. That is, when the connection state between the paper feed roller shaft drive gear and the planetary gear is maintained, power transmission necessary for forward and reverse rotation of the paper feed roller is performed.
[0013]
According to the seventh aspect of the present invention, there is provided a conveying roller shaft provided with a conveying roller that rotates forward and backward by a motor drive, and a feeding roller provided with a feeding roller that rotates forward and backward by obtaining power from the conveying roller shaft. A transmission gear disposed on the conveyance roller shaft, a planetary gear connected to the transmission gear, a planetary lever to which the planetary gear is attached, and the conveyance roller shaft A planetary gear mechanism that transmits power to the paper feed roller shaft only during normal rotation, a paper feed roller shaft drive gear that is disposed on the paper feed roller shaft and that contacts and separates the planetary gear, and the paper feed roller The shaft is rotatably supported on the shaft, has a locking portion at the free end, the locking portion is locked to the engaging portion of the planetary lever, and the connection between the feeding roller shaft driving gear and the planetary gear. Stopper that maintains the state and can be rotated on the paper feed roller shaft And an operating means having a stopper operating lever for engaging and releasing the engaging portion of the stopper and the engaging portion of the planetary lever, and the planetary lever rotates about the transport roller shaft It is supported so that it is possible.
According to the seventh aspect of the invention, since the stopper is operated at a position away from the fulcrum of the planetary lever, the connection state between the paper feed roller shaft driving gear and the planetary gear is reliably maintained, and stable power transmission is achieved. Is possible. Further, the configuration of the planetary lever is simplified by using the transport roller shaft, thereby reducing the number of support members.
[0014]
According to an eighth aspect of the present invention, there is provided a paper feeding device that is rotated forward and backward by a motor drive, a conveyance roller shaft provided with a conveyance roller, and a forward and reverse rotation obtained by obtaining power from the conveyance roller shaft. A feed gear provided with a transmission gear disposed on the transport roller shaft, a planetary gear connected to the transmission gear, and a planetary lever to which the planetary gear is attached. A planetary gear mechanism that transmits power to the paper feed roller shaft only during forward rotation of the transport roller shaft, and a paper feed roller shaft drive gear that is disposed on the paper feed roller shaft and that contacts and separates the planetary gear. The feed roller shaft is rotatably supported, has a locking portion at a free end, the locking portion is locked to the engaging portion of the planetary lever, and the paper feed roller shaft driving gear; A stopper for maintaining a connection state with the planetary gear, and the paper feed roller shaft And an operating means having a stopper operating lever for locking and releasing the engaging part of the stopper and the engaging part of the planetary lever. A cam follower provided on the lever, and a wheel having an annular groove cam with which the cam follower abuts, wherein the wheel is disposed on a release shaft on which a member for cooperating with the paper feed roller is disposed, The stopper operating lever is rotated by rotating the release shaft at a predetermined angle.
According to the eighth aspect of the present invention, the operation control of the members that co-operate with the paper feed roller, such as the paper feed driven roller, the pressure pad, and the paper return lever, is performed by the rotation of the release shaft. By disposing the wheel on the release shaft, it becomes possible to control the transmission of power to the paper feed roller in relation to the member that moves together with the paper feed roller. Thus, by obtaining the power of the wheel from the release shaft, an independent motor for the wheel becomes unnecessary, so that a reduction in size and an energy saving effect can be expected.
[0015]
According to a ninth aspect of the present invention, there is provided a paper feeding device that is rotated forward and backward by a motor drive, and is provided with a feeding roller shaft provided with a conveying roller, and forward and reverse rotation obtained by power from the conveying roller shaft. A feed gear provided with a transmission gear disposed on the transport roller shaft, a planetary gear connected to the transmission gear, and a planetary lever to which the planetary gear is attached. A planetary gear mechanism that transmits power to the paper feed roller shaft only during forward rotation of the transport roller shaft, and a paper feed roller shaft drive gear that is disposed on the paper feed roller shaft and that contacts and separates the planetary gear. The feed roller shaft is rotatably supported, has a locking portion at a free end, the locking portion is locked to the engaging portion of the planetary lever, and the paper feed roller shaft driving gear; A stopper for maintaining a connection state with the planetary gear, and the paper feed roller shaft And an operating means having a stopper operating lever for locking and unlocking the engaging portion of the stopper and the engaging portion of the planetary lever. A second operating means for forcibly releasing the locking between the stopping portion and the engaging portion of the planetary lever is provided.
According to the ninth aspect of the present invention, when a service such as maintenance inspection is performed, if the transport roller shaft and the paper feed roller shaft are connected by a planetary mechanism, the work to be performed with the paper feed roller shaft free is performed. Can not. By providing the second operation means, the maintenance of the connection state between the paper feed roller shaft driving gear and the planetary gear can be manually released regardless of the first operation means. That is, in any situation, the second axis can be freed by either the first operating means or the second operating means, so that the service is facilitated.
[0016]
According to a tenth aspect of the present invention, there is provided the sheet feeding device according to the ninth aspect, wherein the second operating means is forcibly released by the opening operation of the cover member. According to the tenth aspect of the present invention, since the second operating means is interlocked with the opening and closing of the cover member, the sheet feeding roller can be surely made free. It is not necessary to check the connection state between the roller shaft drive gear and the planetary gear, and maintenance work is facilitated.
[0017]
According to an eleventh aspect of the present invention, there is provided the paper feeding device according to the ninth or tenth aspect, wherein a spring for connecting between the stopper and the stopper operating lever is provided, and the springs are integrated with each other in contact with each other by the tension of the spring. The stopper is rotatably provided against the tension of the spring in the direction of releasing the locking from the locking state of the locking portion of the stopper and the engaging portion of the planetary lever. A slider for operating the stopper in the direction is provided. According to the eleventh aspect of the present invention, the stopper can be operated from the second operating means even when the stopper operating lever is restrained or not at the normal position. This is effective for work that must be done without separating the paper roller and transport roller.
[0018]
According to a twelfth aspect of the present invention, in the paper feeder according to the eleventh aspect, after the second operating means forcibly releases the engagement between the stopper engaging portion and the planetary lever engaging portion. When the transport roller shaft is rotated forward after returning to the state before the release, the engagement between the stopper locking portion and the planetary lever engagement portion is caused by the rotation of the planetary lever and the rotation of the stopper by the tension of the spring. It is characterized in that it is stopped. According to the twelfth aspect of the invention, when the second operating means is operated, the stopper locking portion and the planetary lever engaging portion are locked during the subsequent forward rotation of the transport roller shaft. Therefore, the initialization for the subsequent paper feed control can be performed accurately.
[0019]
According to a thirteenth aspect of the present invention, a recording apparatus includes the paper feeding device according to any one of the sixth to twelfth aspects. According to the thirteenth aspect of the present invention, it is possible to realize a recording apparatus that can be miniaturized and has high-precision sheet feeding performance.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described. 1 is a perspective view seen from the front side of the printer apparatus to which the power transmission device according to the present invention is applied, with the cover removed, FIG. 2 is a perspective view seen from the rear side of the printer apparatus in FIG. 1, and FIG. FIG. 4 is a schematic view of a sheet feeding device in the printer apparatus.
[0021]
First, an outline of the printer apparatus will be described. The printer apparatus 1 includes a sheet cassette mounting portion 2 provided with a sheet cassette insertion slot 2A on the front side of the apparatus main body, and supplies a plurality of sheets P stacked from the sheet cassette insertion slot 2A. A paper cassette 20 is inserted and mounted. A main frame 110 erected on the bottom frame 40 includes a main shaft 112 that supports a carriage 111 on which the recording head 12 is mounted so as to be movable in the main scanning direction, a carriage 113 that includes a motor 113 and a belt 114 that drive the carriage 111. 115, a paper feeding unit 116, a paper feeding unit 117, and a carriage home station 118 for performing maintenance such as cleaning of the recording head 12 and ink suction are provided at the rear of the apparatus main body.
[0022]
In the paper feed cassette mounting portion 2, a push plate operating lever 3 having a rotation fulcrum 3a is provided in the bottom frame 40 on the paper feed cassette insertion slot 2A side so as to extend to the vicinity of the paper feed roller 6. The plate operating lever 3 is biased toward the paper feed roller 6 by a spring 3c. When the cam 5 a of the cam body 5 attached to the release shaft 4 acts on the cam follower 3 b provided on the push plate operation lever 3, the push plate operation lever 3 pushes on the bottom plate portion 22 of the paper feed cassette 20 having the rotation fulcrum 21 a. A position in which the plate 21 is pushed up every time the paper P is fed (paper feeding state: a position indicated by a solid line in FIG. 4) and a position in which the plate 21 is pushed down from the position (non-paper feeding state: a two-dot chain line in FIG. To the position indicated by.
[0023]
The paper feed unit 117 has a release shaft 4 and a paper feed roller shaft 6 a arranged in parallel. A plurality of paper feed rollers 6 are provided on the paper feed roller shaft 6 a, and on the other hand, on the release shaft 4. Is a separation pad unit 61 comprising a separation pad 6B and a separation pad actuating mechanism, a paper feed driven roller unit 62 comprising a paper feed driven roller 6C and a paper feed driven roller advancing and retracting mechanism, a paper return lever 6D and a paper return lever operating mechanism. A return unit 63 and a wheel 71 constituting a power transmission device 70 to be described later are arranged.
[0024]
When the release shaft 4 and the feed roller shaft 6a are rotated by the start of feeding, the next sheet fed together with the preceding sheet P by the rotation of the sheet return lever 6D is first fed into the sheet feeding cassette 20. Push back to. Then, the separation pad 6B and the paper feed driven roller 6C are pressed against the paper feed roller 6, and the push plate 21 is pushed up to the paper feed roller 6 side by the operation lever 3. Pressed against.
[0025]
The paper P on the upper layer side of the paper feed cassette 20 is separated one by one by the paper separation auxiliary roller 6A, fed by the paper feed roller 6, guided by the paper guide roller 7 and the paper guide unit 8, and the paper detector. 9, paper detection is performed, and the paper is sent to a transport unit 116 including the transport roller 10 and the driven roller 11. Subsequently, drive control of the transport roller 10 is performed based on the paper detection to skew and cue the paper P, and the paper P is transported to a recording area composed of the recording head 12 and the platen 13 in accordance with the recording timing. Printing is performed and discharged.
[0026]
The power transmission device according to the present invention applied to the above-described printer device will be described in detail. FIG. 5 is a development view of the power transmission device of the present invention, and FIG. 6 is a view taken along arrows II in FIG. As elements constituting the power transmission device of the present invention, the first shaft corresponds to the transport roller shaft, and the second shaft corresponds to the paper feed roller shaft.
[0027]
The main motor 72 rotates the conveyance roller drive gear 72b on the conveyance roller shaft 10a via the intermediate gear group 72a to drive the conveyance roller 10, and includes a transmission gear 72c and a planetary gear 72d on the conveyance roller shaft 10a. The paper feed roller driving gear 72e on the paper feed roller shaft 6a is rotated via the planetary gear mechanism 73 to drive the paper feed roller 6. A wheel 71 is disposed on the release shaft 4, and an annular groove cam 71a is formed on the side surface thereof. The cam follower 74 a of the stopper operating lever 74 is in contact with the groove cam 71 a of the wheel 71.
[0028]
A base portion 74b of the stopper operating lever 74 is rotatably supported by the paper feed roller shaft 6a, and rotates the stopper operating lever 74 within a predetermined angular range by the rotation of the wheel 71. A stopper 75 linked to a stopper operating lever 74 is rotatably supported on the paper feed roller shaft 6a. The stopper 75 connects a pair of stopper arms 75a and 75b disposed on the sheet feeding roller shaft 6a on both sides of the sheet feeding roller driving gear 72e and the free arms of the stopper arms 75a and 75b. It consists of a lock bar 75c serving as a locking portion that locks on the lever 73a.
[0029]
In FIG. 7, a spring 76 is stretched between the stopper operating lever 74 and the stopper 75, and a lever restricting portion 74b and a stopper restricting portion 75d that abut against each other at a predetermined angle when they are rotated with each other are provided. The lever restricting portion 74b and the stopper restricting portion 75d are urged in a direction in which they abut against each other by a spring 76. Normally, the lever 76 rotates integrally with the lever restricting portion 74b and the stopper restricting portion 75d in contact with each other by the action of the spring 76 (FIG. 7 (1)). When forcibly releasing the stopper 75 and the planetary lever 73a, which will be described later, as shown in FIG. 7 (2), only the stopper 75 is rotated against the tension of the spring 76 in the direction of the arrow. Can do.
[0030]
As shown in FIG. 8, the planetary gear mechanism 73 has a planetary lever 73a rotatably supported on the transport roller shaft 10a, and a planetary gear 72d engaged with the transmission gear 72c is disposed on the planetary lever 73a. Yes. The tip (free end) of the planetary lever 73a extends to a position that intersects with the paper feed roller shaft 6a, and a mountain shape is formed at a portion extending to the moving area of the notch 730 and the lock bar 75c of the stopper 75 at the intersecting portion. A cut-out lock bar engaging portion 731 is formed. The end surface on the free end side of the planetary lever 73a is an arc surface 732, and the arc surface 732 close to the lock bar engaging portion 731 is a trunk contact portion of the lock bar 75c.
[0031]
At the time of forward rotation of the transport roller shaft 10a shown in FIG. 9 (1), the planetary lever 73a rotates in the direction of the arrow, and the lower surface 733 of the notch 730 comes into contact with the paper feed roller shaft 6a to be restricted. Since the planetary gear 72d and the paper feed roller drive gear 72e are maintained in the connected state, the rotation of the transmission gear 72c becomes a rotatable state that is transmitted to the paper feed roller shaft 6a. On the other hand, at the time of reverse rotation of the transport roller shaft 10a shown in FIG. 9B, the planetary lever 73a rotates in the direction of the arrow to disconnect the planetary gear 72d and the paper feed roller drive gear 72e, and the paper feed roller shaft 6a is not turned on. Rotating state.
[0032]
A mechanism for forcibly releasing the engagement between the planetary lever 73a and the planetary lever stopper 75 in conjunction with opening and closing of the rear cover 120 will be described. As shown in FIG. 2, the rear cover 120 has a cover shaft 120a supported by a cover mounting portion 121 provided on the rear frame 110a, and is provided to be able to be tilted up and down at the rear of the printer body. A boss 120b protrudes laterally from the rear cover 120 and at a predetermined distance from the cover shaft 120a.
[0033]
On the printer main body side, a slider 77 that is movable in a direction crossing the paper feed roller shaft 6a is disposed. One end of the slider 77 passes through the rear frame 110a, and a rectangular hole 77a is formed in the protruding portion. The boss 120b of the rear cover 120 is linked to the rectangular hole 77a. The other end side of the slider 77 is L-shaped, and the tip of the slider 77 reaches substantially below the paper feed roller drive gear 72e.
[0034]
10 and 11, the tip of the slider 77 extends between the planetary lever 73a and the stopper arm 75b, and a pressing portion 77b having a surface for pressing the lock bar 75c of the stopper 75 is provided upright. . When the rear cover 120 is opened, the slider 77 moves in the direction of the arrow shown in FIG. 12, and the pressing portion 77b pushes the lock bar 75c away from the planetary lever 73a as shown in FIG. The engagement with the portion 731 is released, and the planetary lever 73a is changed from the locked state in FIG. 11 to the locked state in FIG.
[0035]
The operation of the above embodiment will be described. When carrying out a normal paper feeding operation, when the transport roller shaft 10a is rotated forward, the planetary lever 73a receives a force rotating in the direction of the arrow as shown in FIG. 13, and the planetary gear 72d and the paper feeding roller driving gear 72e. Is connected to rotate the paper feed roller shaft 6a in the normal direction. With this operation, the paper is fed. When the transport roller shaft 10a is reversed, the planetary lever 73a receives a force rotating in the direction of the arrow as shown in FIG. 14, disconnects the planetary gear 72d and the paper feed roller drive gear 72e, and feeds the paper feed roller shaft 6a. Does not rotate. This operation is used for, for example, an operation for removing skew with respect to the paper that has reached the transport roller 6 by stopping the rotation of the paper feed roller 6 and reversing the transport roller 10.
[0036]
Next, when the paper feeding roller 6 is rotated forward and backward to perform the paper feeding operation, when the release shaft 4 is rotated 1/4, the wheel 71 is in the position shown in FIG. 15 and the stopper operating lever 74 is rotated in the direction of the arrow. Move. When the cam follower 74a of the stopper operating lever 74 moves along the groove cam 71a, the stopper 75 is pulled via the spring 76 and tries to rotate in the same direction as the stopper operating lever 74. However, the lock bar 75c is connected to the planetary lever 73a. Abutting on the end face 732 prevents rotation and is in the illustrated position. Subsequently, when the transport roller shaft 6a is reversed, in FIG. 16, the planetary lever 73a rotates in the direction of the arrow, connects the planetary gear 72d and the paper feed roller drive gear 72e, and is biased by the spring 76. The stopper 75 rotates in the direction of the arrow, and as shown in FIG. 17, the lock bar 75c is engaged with the lock bar engaging portion 731 and the planetary lever 73a is engaged (locked). When the planetary lever 73a is in the locked state, the paper feed roller shaft 6a can be rotated forward when the transport roller shaft 10a is rotated forward, while the paper feed roller shaft 6a can be rotated reverse when the transport roller shaft 10a is reversed. This operation can be used as an operation for returning the paper that has been accompanied by the preceding paper and fed into the transport path to the paper feed cassette or hopper. When returning from this state to the home position, when the wheel 71 is rotated by ¼, the lever restricting portion 74b is moved to the stopper restricting portion 75d of the planetary lever stopper 75 as shown in FIG. To release the lock of the planetary lever 73a by the lock bar 75c, and the state shown in FIG. 13 is obtained.
[0037]
Next, operations during maintenance of the paper feed unit such as paper jam release will be described. In FIG. 19, when the rear cover 120 is opened, the slider 77 moves. For example, when the planetary lever 73 a shown in FIG. 17 is in the locked state, the locking is released by the movement of the slider 77. The paper feed roller 6 is rotated forward to remove the jammed paper. At this time, the planetary lever 73a rotates in the direction of the arrow shown in FIG. 20 due to the forward rotation of the paper feed roller 6, and the planetary gear 73d and the paper feed roller drive gear 72e are disconnected. Thereafter, when the rear cover 120 is closed, the slider 77 moves in the opposite direction to the previous opening, and the lock bar 75c hits the front end of the planetary lever 73a and stops. The subsequent operation is the same as the operation in the state shown in FIG.
[0038]
【The invention's effect】
According to the power transmission device of the recording apparatus according to the present invention, the locking means for locking the planetary gear mechanism in the power transmission state from the first shaft to the second shaft is provided, and the first means is operated by operating the locking means. It is possible to transmit or not transmit the power of bidirectional rotation from the shaft to the second shaft, and it is possible to reduce the size of the apparatus by reducing the number of gear parts of the second shaft drive system.
[0039]
According to the paper feeding device of the present invention, since the stopper is operated at a position away from the fulcrum of the planetary lever, the connection state between the paper feeding roller shaft driving gear and the planetary gear is reliably maintained, and stable power can be obtained. Communication is possible. By placing the stopper and stopper operating lever on the paper feed roller shaft, the stopper operating lever is operated within the same rotation trajectory, so that the connection state between the paper feed roller shaft drive gear and the planetary gear is maintained or connected. The maintenance and release of the state can be reliably performed, and the structure is simplified by using a common member for supporting the stopper and the stopper operating lever, and further reducing the number of gear parts of the paper feed roller shaft drive system. Can be miniaturized.
[Brief description of the drawings]
FIG. 1 is a perspective view of a printer device to which a power transmission device according to the present invention is applied, as viewed from the front side with a cover removed.
2 is a perspective view of the printer apparatus of FIG. 1 as viewed from the back side.
FIG. 3 is a plan view of a paper feeding unit.
FIG. 4 is a schematic diagram of a paper feeding device in a printer device.
FIG. 5 is a development view of the power transmission device of the present invention.
6 is a view taken in the direction of arrows I-I in FIG. 5;
FIGS. 7A and 7B show the relationship between the stopper operating lever and the stopper, wherein FIG. 7A is an integrated structure, and FIG. 7B is an explanatory diagram when only the stopper is rotated.
FIG. 8 is a front view of the planetary gear mechanism.
FIGS. 9A and 9B show the operation of the planetary gear mechanism, where FIG. 9A is an explanatory diagram during forward rotation and FIG. 9B is an explanatory diagram during reverse rotation.
FIG. 10 is an explanatory diagram for releasing the locking between the stopper and the planetary lever by the opening operation of the cover member.
FIG. 11 is an explanatory diagram before releasing the lock in FIG. 10;
12 is an explanatory view after the locking is released in FIG. 10;
FIG. 13 is an explanatory diagram during normal forward rotation.
FIG. 14 is an explanatory diagram of normal reverse rotation.
FIG. 15 is an explanatory diagram when the wheel is operated.
FIG. 16 is an explanatory diagram of a locking operation between the stopper and the planetary lever.
FIG. 17 is an explanatory diagram of forward and reverse rotation.
FIG. 18 is an explanatory diagram of the unlocking operation from the locked state of the stopper and the planetary lever.
FIG. 19 is an explanatory view of the unlocking operation of the stopper and the planetary lever in conjunction with the opening operation of the cover member.
20 is an explanatory diagram of an operation of disconnecting the connection between the planetary gear and the paper feed roller shaft driving gear after the unlocking of FIG. 19;
[Explanation of symbols]
1 Printer device
4 Release axis
6 Paper feed roller
6a Feed roller shaft (second shaft)
10 Transport roller
10a Conveying roller shaft (first shaft)
20 Paper cassette
70 Power transmission device
71 Wheel with groove cam
73 Planetary Gear Mechanism
73a Planetary lever
74 Stopper operation lever
75 stopper
77 Slider
111 Carriage
117 Paper feeder
120 Rear cover

Claims

A first shaft that rotates forward and backward by motor drive, a second shaft that acquires power from the first shaft and rotates forward and backward, and a power transmission means that transmits power from the first shaft to the second shaft; In a power transmission device for a recording apparatus comprising:
The power transmission means has a transmission gear arranged on the first shaft and a planetary gear connected to the transmission gear, and the power to the second shaft is only rotated in one direction of the first shaft. A planetary gear mechanism that performs transmission, and a second shaft drive gear that is disposed on and away from the planetary gear, and is disposed on the second shaft.
The second shaft drive gear and the planetary gear can be operated in a connected state between the second shaft drive gear and the planetary gear, and the lock means that maintains the connected state is operated by the motor drive. Operating means for releasing the maintenance of the connection state between the first shaft and the second operation means for forcibly releasing the maintenance of the connection state between the second shaft driving gear and the planetary gear by manually operating the locking means. And a power transmission device for a recording apparatus.

2. The recording apparatus according to claim 1, wherein the planetary gear mechanism includes a planetary lever that is rotatably supported on the first shaft, and has a planetary gear attached thereto, and the locking unit fixes the planetary lever. Power transmission device.

In claim 1, on the second shaft is rotatably supported, a stopper having a locking portion at the free end is disposed, and the planetary gear mechanism is rotatably supported on the first shaft, A planetary lever having a planetary gear attached thereto, and the planetary lever is provided with an engaging portion for engaging with the engaging portion of the stopper, and the operating means rotates the stopper to lock the stopper; A power transmission device for a recording apparatus, comprising: a stopper operating lever that locks and unlocks the engaging portion of the portion and the planetary lever.

4. The power transmission device for a recording apparatus according to claim 3, wherein the stopper operating lever is rotatably supported on the second shaft.

5. The operation means according to claim 2, wherein the operation means includes a cam follower provided on the stopper operation lever, a cam body having a cam with which the cam follower abuts, and a drive means for operating the cam body. A power transmission device for a recording apparatus.

A sheet feeding device comprising: a conveyance roller shaft that is rotated forward and backward by a motor drive and provided with a conveyance roller; and a sheet feeding roller shaft that is rotated forward and backward by obtaining power from the conveyance roller shaft and provided with a sheet feeding roller In
A transmission gear disposed on the conveyance roller shaft; a planetary gear connected to the transmission gear; and a planetary lever to which the planetary gear is attached. A planetary gear mechanism for transmitting the power of
A paper feed roller shaft driving gear disposed on the paper feed roller shaft, to which the planetary gear is contacted and separated;
The feed roller shaft is rotatably supported, has a locking portion at a free end, the locking portion is locked to the engaging portion of the planetary lever, and the feeding roller shaft driving gear and the planetary gear. A stopper that maintains the connection with the gear;
An operation means which is supported rotatably on the paper feed roller shaft and has a stopper operating lever for locking and releasing the locking portion of the stopper and the engaging portion of the planetary lever;
The stopper engaging portion and the planetary lever engaging portion can be engaged only when the connection state between the paper feeding roller shaft driving gear and the planetary gear is maintained. apparatus.

A sheet feeding device comprising: a conveyance roller shaft that is rotated forward and backward by a motor drive and provided with a conveyance roller; and a sheet feeding roller shaft that is rotated forward and backward by obtaining power from the conveyance roller shaft and provided with a sheet feeding roller In
A transmission gear disposed on the conveyance roller shaft; a planetary gear connected to the transmission gear; and a planetary lever to which the planetary gear is attached. A planetary gear mechanism for transmitting the power of
A paper feed roller shaft driving gear disposed on the paper feed roller shaft, to which the planetary gear is contacted and separated;
The feed roller shaft is rotatably supported, has a locking portion at a free end, the locking portion is locked to the engaging portion of the planetary lever, and the feeding roller shaft driving gear and the planetary gear. A stopper that maintains the connection with the gear;
An operation means which is supported rotatably on the paper feed roller shaft and has a stopper operating lever for locking and releasing the locking portion of the stopper and the engaging portion of the planetary lever;
The paper feeding device, wherein the planetary lever is rotatably supported on the transport roller shaft.

A sheet feeding device comprising: a conveyance roller shaft that is rotated forward and backward by a motor drive and provided with a conveyance roller; and a sheet feeding roller shaft that is rotated forward and backward by obtaining power from the conveyance roller shaft and provided with a sheet feeding roller In
A transmission gear disposed on the conveyance roller shaft; a planetary gear connected to the transmission gear; and a planetary lever to which the planetary gear is attached. A planetary gear mechanism for transmitting the power of
A paper feed roller shaft driving gear disposed on the paper feed roller shaft, to which the planetary gear is contacted and separated;
The feed roller shaft is rotatably supported, has a locking portion at a free end, the locking portion is locked to the engaging portion of the planetary lever, and the feeding roller shaft driving gear and the planetary gear. A stopper that maintains the connection with the gear;
An operation means which is supported rotatably on the paper feed roller shaft and has a stopper operating lever for locking and releasing the locking portion of the stopper and the engaging portion of the planetary lever;
The operating means includes a cam follower provided on a stopper operating lever, and a wheel having an annular groove cam with which the cam follower abuts.
The wheel is disposed on a release shaft on which a member that co-acts with the paper feed roller is disposed, and the stopper operating lever is rotated by rotation of the release shaft by a predetermined angle.

A sheet feeding device comprising: a conveyance roller shaft that is rotated forward and backward by a motor drive and provided with a conveyance roller; and a sheet feeding roller shaft that is rotated forward and backward by obtaining power from the conveyance roller shaft and provided with a sheet feeding roller In
A transmission gear disposed on the conveyance roller shaft; a planetary gear connected to the transmission gear; and a planetary lever to which the planetary gear is attached. A planetary gear mechanism for transmitting the power of
A paper feed roller shaft driving gear disposed on the paper feed roller shaft, to which the planetary gear is contacted and separated;
The feed roller shaft is rotatably supported, has a locking portion at a free end, the locking portion is locked to the engaging portion of the planetary lever, and the feeding roller shaft driving gear and the planetary gear. A stopper that maintains the connection with the gear;
An operation means which is supported rotatably on the paper feed roller shaft and has a stopper operating lever for locking and releasing the locking portion of the stopper and the engaging portion of the planetary lever;
A sheet feeding device comprising: a second operation unit that forcibly releases the locking between the locking portion of the stopper and the engaging portion of the planetary lever by manual operation.

The sheet feeding device according to claim 9, wherein the second operation unit is released from the engagement by an opening operation of a cover member.

11. A spring according to claim 9 or 10, wherein a spring for connecting the stopper and the stopper operating lever is provided, and they are integrated in abutment with each other by the tension of the spring, and the locking portion of the stopper and the engaging portion of the planetary lever The stopper is rotatably provided against the tension of the spring from the locked state to the unlocking direction, and the second operating means is provided with a slider for operating the stopper in the direction. A paper feeding device characterized by that.

In Claim 11, after a 2nd operation means forcibly cancels | releases locking of the latching | locking part of a stopper, and the engaging part of a planetary lever, after returning to the state before the cancellation | release, a conveyance roller axis | shaft is used. A sheet feeding device characterized in that, when rotated forward, the stopper locking portion and the planetary lever engaging portion are locked by rotation of the planetary lever and rotation of the stopper by the tension of the spring.

A recording apparatus comprising the paper feeding device according to claim 6.