JP3698681B2 - Gripper drive device - Google Patents

Gripper drive device Download PDF

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Publication number
JP3698681B2
JP3698681B2 JP2002096702A JP2002096702A JP3698681B2 JP 3698681 B2 JP3698681 B2 JP 3698681B2 JP 2002096702 A JP2002096702 A JP 2002096702A JP 2002096702 A JP2002096702 A JP 2002096702A JP 3698681 B2 JP3698681 B2 JP 3698681B2
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Prior art keywords
cam
gripper
cam surface
printing
cylinder
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JP2002096702A
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JP2003291305A (en
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哲也 小森山
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Ryobi Ltd
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Ryobi Ltd
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Priority to JP2002096702A priority Critical patent/JP3698681B2/en
Priority to US10/390,036 priority patent/US20030187753A1/en
Priority to CN 03107597 priority patent/CN1223458C/en
Priority to DE2003114545 priority patent/DE10314545B4/en
Publication of JP2003291305A publication Critical patent/JP2003291305A/en
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06QINFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q30/00Commerce
    • G06Q30/06Buying, selling or leasing transactions

Description

【0001】
【発明の属する技術分野】
本発明は、グリッパ駆動装置に関し、特に、枚葉紙の受け渡しのタイミングの調整に関する。
【0002】
【従来の技術】
一般に、印刷用紙として枚葉紙を使用するオフセット枚葉印刷機においては、各種の胴に枚葉紙の端部を咥えるグリッパが設けられている。
例えば、図1に示すような片面印刷と両面印刷とが切り替え可能な両面印刷機は、給紙部1、印刷部2及び排紙部3から構成され、印刷部2は二つの印刷ユニット4,5を備えている。両印刷ユニット4,5間には、引き渡し胴8(第一の渡し胴)と貯え胴9(第二の渡し胴)と反転胴10からなる紙受け渡しユニットが設けられ、該紙受け渡しユニットによって上流側の印刷ユニット4の圧胴6から下流側の印刷ユニット5の圧胴7に枚葉紙が受け渡される。具体的には、両面印刷時には、上流側の印刷ユニット4で一方の面が印刷された後、紙受け渡しユニットの反転胴10によって表裏反転されて下流側の印刷ユニット5に受け渡されて、残る他方の面が印刷される。また、片面印刷時には、紙受け渡しユニットでは表裏反転されないために、両印刷ユニット4,5で片面のみが多色刷りされる。尚、図1の印刷機の場合、両面印刷時には両面共に二色ずつ印刷され、片面印刷時には片面が合計四色刷りされる。
【0003】
このような構成の印刷機においては、両圧胴6,7と引き渡し胴8と貯え胴9にはそれぞれ爪座(爪台)と共に枚葉紙の前端部を咥える片爪タイプのグリッパ11が設けられ、反転胴10には反転グリッパ13が設けられている。該反転グリッパ13は、親爪と子爪とで枚葉紙を咥える両爪タイプのグリッパであり、片面印刷時には枚葉紙の前端部を咥える一方、両面印刷時には枚葉紙の後端部を咥えて表裏反転させる。
【0004】
具体的には、片面印刷時には、図8(ロ)に示すように、反転グリッパ13は、貯え胴9と反転胴10との対接点において、爪の先端が反転胴10の回転方向後方を向いた姿勢のもとに貯え胴9のグリッパ11から枚葉紙の前端部を咥えて受け取る。そして、その姿勢を維持しながら反転胴10と共に矢印P方向に回転し、反転胴10と下流側の圧胴7との対接点において枚葉紙を圧胴7に引き渡す。その後、反転胴10の回転方向前方側に向けて一旦所定角度旋回した後、貯え胴9との対接点の手前で逆に反転胴10の回転方向後方側に向けて旋回して、貯え胴9との対接点において枚葉紙の前端部を咥える。その一方、両面印刷時には、図8(イ)に示すように、反転グリッパ13は、貯え胴9との対接点において、爪の先端が反転胴10の回転方向前方を向いた姿勢のもとに、貯え胴9の紙吸着装置12に吸着保持された枚葉紙の後端部を咥える。そして、反転胴10の回転に合わせて反転胴10の回転方向後方側に向けて略180度旋回して枚葉紙を表裏反転させた後、圧胴7との対接点で枚葉紙を引き渡す。その後、反転グリッパ13は、貯え胴9との対接点で再び爪の先端が反転胴10の回転方向前方側を向くように、圧胴7との対接点から貯え胴9の対接点までの間に反転胴10の回転方向前方側に向けて略180度旋回する。
【0005】
このような反転グリッパ13を駆動制御するグリッパ駆動装置としては、例えば、特公昭56−2017号公報所載のものが公知である。図9に示すように、反転グリッパ13は駆動軸24に装着されていて駆動軸24を中心として回動することにより、開閉動作や旋回動作を行う。即ち、グリッパ駆動装置は、駆動軸24の端部に取り付けられたピニオン29と、該ピニオン29に噛合する歯部31aを有するセグメントギア31(駆動ギア)とを備えている。該セグメントギア31は、反転胴10の端面に軸支されたギア軸40を中心として回動可能に設けられている。そして、該セグメントギア31にはカムフォロア35が取り付けられていて、フレーム(図示せず)の内側に固定された円盤状のカム部材(図示せず)のカム面33a上をカムフォロア35が反転胴10の回転に応じて走行することによって、セグメントギア31がギア軸40を中心に揺動する。このようにセグメントギア31が揺動することによって駆動軸24が所定角度回転し、反転グリッパ13は上述のような開閉動作や旋回動作を行う。
【0006】
上述したように両面印刷時と片面印刷時とで反転グリッパ13の動作は異なるため、グリッパ駆動装置は両面印刷用カム面と片面印刷用カム面とを備えており、カムフォロア35の当接するカム面を切り替えることによって印刷状態に応じて反転グリッパ13を駆動制御する。
【0007】
ところで、このような各種のグリッパにおいては、枚葉紙を受け渡す際のタイミングが重要となる。即ち、上流側の胴から枚葉紙を受け取る時と、下流側の胴に枚葉紙を引き渡す時のタイミングが重要である。この受け渡しのタイミングにずれがあると受け渡し不良が生じるおそれがあるため、タイミングにずれがある場合にはその調整が必要となる。また、グリッパは胴の軸線方向に沿って間隔をおいて並設されているため、各グリッパが一斉に開閉して枚葉紙の受け渡しを行うようにグリッパ毎にタイミングを調整する必要がある。
【0008】
このような受け渡しのタイミングの調整は、受け渡し位置、即ち、受け取り位置と引き渡し位置におけるグリッパの爪の間のギャップを調整することによって行われる。このグリッパの爪の間のギャップとは、片爪タイプの場合には爪と爪座(爪台)との間のギャップであり、両爪タイプの場合には両爪間のギャップである。例えば、両爪タイプの場合、受け取り位置における両爪間のギャップが所定値よりも大きい場合には、枚葉紙を受け取るタイミングは正規のものよりも遅くなり、逆にギャップが所定値よりも小さい場合には、枚葉紙を受け取るタイミングは正規のものよりも速くなる。従って、受け渡し位置においてギャップが所定値になるように調整することが必要になる。
【0009】
このギャップ調整には、一般に基準紙と呼ばれる所定厚さ(例えば厚さ0.08mm)の枚葉紙が使用される。両爪タイプの場合を例にすると、受け渡し位置においてこの基準紙を両爪間に挿入することにより、受け渡し位置におけるギャップが基準紙の厚さと略同じになるように調整する。このギャップ調整は、受け取り位置と引き渡し位置のうちの何れか一方で行えばよく、一般には紙送りに沿って上流側から順に受け渡しのタイミングを調整していくため、受け取り位置側で行われる。
【0010】
例えば、上述したような反転グリッパ13の場合には、貯え胴9との対接点において貯え胴9のグリッパ11から枚葉紙を受け取るが、この貯え胴9からの受け取り位置において上記基準紙を使用して反転グリッパ13の両爪間のギャップを調整する。
【0011】
【発明が解決しようとする課題】
しかしながら、貯え胴9との対接点付近は、貯え胴9と反転胴10の間に調整用の工具を入れるための空間が狭いために、本来的に作業を行いにくい箇所である。そのうえ、図1からもわかるように、貯え胴9からの受け取り位置は印刷機の下部に位置するため、作業者は反転胴10の下側に潜り込むようにしてギャップ調整作業を行わねばならない。従って、受け取り位置におけるギャップ調整には極めて大きな労力が必要となる。
【0012】
このような作業負担を軽減させるために、カム面の形状を工夫することにより、実際の受け取り位置とは異なる別の位置において反転グリッパ13が枚葉紙を受け取る姿勢を擬似的に再現するようにして、その位置でギャップ調整を行うことが考えられる。
【0013】
具体的には、圧胴7への引き渡し位置から貯え胴9からの受け取り位置までの間に、反転グリッパ13が受け渡し位置と同じ姿勢をとる擬似紙受け渡し位置を設ける。そのため上記カム面には、圧胴7への引き渡し位置に対応した部分と貯え胴9からの受け取り位置に対応した部分の他に、それらの部分におけるカムフォロアの変位量と同じ変位量を有する部分を別途形成し、その擬似紙受け渡し位置に対応した部分にカムフォロアを当接させ、その状態で反転グリッパ13のギャップを調整するのである。
【0014】
このように、印刷時において枚葉紙を受け渡す際のグリッパの姿勢を受け渡し位置とは別の位置において擬似的に再現するための擬似紙受け渡し部をカム面に形成することにより、作業し易い擬似紙受け渡し位置でギャップ調整を行うことができるため、作業性が改善される。
【0015】
しかしながら、一つのカム面に擬似紙受け渡し部を形成することはカム面の設計上容易ではないという問題がある。特に、反転グリッパ13は両爪タイプであってその旋回中心が反転胴10の外周面上に略位置するため、引き渡し位置から受け取り位置までの間における動作が通常の片爪タイプのグリッパに比して大きくなるという特性があり、反転グリッパ用のカム面は、片爪タイプのグリッパ用のカム面によりもその形状が複雑となる。そのため、片爪タイプのものよりも複雑なカム面に、更に擬似紙受け渡し部を設けることは実際上極めて困難である。また、周方向に間隔をおいて複数箇所にグリッパが配置されている胴、即ち、倍胴以上の胴の場合には、グリッパの配置個所の数に対応してカムフォロアも複数必要となり、一つのカム面を複数のカムフォロアが同時に走行することになる。従って、単胴の場合のカム面よりもカム面の設計に制約が多くなり、その場合も一つのカム面に擬似紙受け渡し部を別途形成することは非常に困難となる。
【0016】
何れにしても、印刷時にグリッパの動作を制御するための印刷用カム面に、擬似紙受け渡し部を追加して設けることはカム面の設計が容易ではないという問題がある。
【0017】
それゆえに本発明は上記従来の問題点に鑑みてなされ、枚葉紙の受け渡しのタイミングの調整を容易に行うことができ、且つ、印刷時にグリッパの動作を制御するための印刷用カム面の設計が容易なグリッパ駆動装置を提供するを課題とする。
【0018】
【課題を解決するための手段】
本発明は、上記課題を解決すべくなされたものであり、本発明に係るグリッパ駆動装置は、枚葉紙を掴むグリッパの動作を印刷時に制御するための印刷用カム面と、胴の回転に伴ってカム面上を走行するカムフォロアとを備えて、カムフォロアの動きによってグリッパを駆動制御するように構成されたグリッパ駆動装置において、前記印刷用カム面とは別に調整用カム面を備え、該調整用カム面に、印刷時に枚葉紙を受け渡す際のグリッパの姿勢を印刷時における受け渡し位置とは異なる位置において擬似的に再現するための擬似紙受け渡し部が設けられ、カムフォロアの当接するカム面が印刷用カム面と調整用カム面とに切り替え可能であることを特徴とする。
【0019】
特に、胴に設けられた軸受け部に回転可能に支持された支軸と、該支軸に固定されたカムレバーとを備え、該カムレバーにカムフォロアが設けられ、カム面の切り替え時に支軸と軸受け部とが一体となって移動することが好ましい。
【0020】
更に、胴の外周面には、該外周面の他の領域と分離された分離可動部が設けられ、該分離可動部の内側に軸受け部が設けられ、カム面の切り替え時に分離可動部と軸受け部とが一体となって移動することが好ましい。
【0021】
【発明の実施の形態】
以下、本発明の一実施形態について図面を参酌しつつ説明するが、上記従来のものと同様の構成部分については重複した説明を省略し、また、実質的に同一の機能を有する部分については同一符号を付している。
【0022】
図1において上下両圧胴6,7は共に倍胴であって、引き渡し胴8と反転胴10も倍胴であり、貯え胴9は三倍胴となっている。従って、貯え胴9には、グリッパ11と紙吸着装置12がそれぞれ略120度間隔をおいて合計三つずつ配置され、引き渡し胴8には、枚葉紙の前端部を掴むグリッパ11が略180度対向して配置され、反転胴10には、片面印刷時に枚葉紙の前端部を、両面印刷時に枚葉紙の後端部をそれぞれ掴む反転グリッパ13が略180度対向して配置されている。
【0023】
図2に示す反転胴10は、回転軸20と一体となって回転する構成であって、その回転軸20は左右両フレーム21,22に軸受け23を介して回転可能に支持されている。該反転胴10は、反転グリッパ13が装着された駆動軸24を略180度対向した位置に一対備えている。図2のように駆動軸24は反転胴10の回転軸20と平行であり、その軸線方向に沿って反転グリッパ13は間隔をおいて複数並設されており、各反転グリッパ13は一斉に同一の動作を行う。
【0024】
かかる反転グリッパ13は、図7に示すように親爪25と子爪26の協働によって枚葉紙を掴む構成となっている。そして、駆動軸24は、爪管27と該爪管27に同軸状に挿入された爪軸28とから構成されている。爪管27は子爪26を駆動制御するためのもので爪軸28は親爪25を駆動制御するためのものであり、従って、親爪25は爪軸28に固定され、子爪26は爪管27に固定されている。但し、逆に固定されていてもよい。
【0025】
図2のように、爪管27の一端部(図中左端)と爪軸28の他端部(図中右端)にはそれぞれピニオン29,30が取り付けられ、各ピニオン29,30は、反転胴10の両端部にそれぞれ設けられたセグメントギア31,32(駆動ギア)と噛合している。即ち、反転胴10の一端側(図中左端)に子爪26を駆動制御するためのグリッパ駆動装置が設けられ、反転胴10の他端側(図中右端)には親爪25を駆動制御するためのグリッパ駆動装置が設けられている。尚、子爪26用のグリッパ駆動装置と親爪25用のグリッパ駆動装置とはカム部材33,34を除いてほぼ同様の構成であるため、以下、子爪26用のグリッパ駆動装置について主に説明する。
【0026】
図3には、子爪26用のグリッパ駆動装置が示されている。この反転胴10は倍胴であって駆動軸24が略180度対向して一対設けられている。そのため、反転グリッパ13を駆動軸24毎に各々独立して駆動制御するように、子爪26用のカムフォロア35やセグメントギア31等は、反転胴10の中心に対して点対称の位置関係となるように、略180度対向して一対設けられている。
【0027】
セグメントギア31は、略90度の扇状に形成されていてその外周にピニオン29と噛合する歯部31aを有している。該セグメントギア31は駆動軸24と平行なギア軸40に固定され、ギア軸40は反転胴10の端面に回転可能に支持されている。従って、セグメントギア31はギア軸40を中心としてギア軸40と一体となって所定角度範囲内で揺動するように回動する。尚、ギア軸40は駆動軸24と反転胴10の中心とを結ぶ線上に配置されている。
【0028】
一方、カムフォロア35は、ギア軸40と平行に配置されたレバー軸41(支軸)に固定されたカムレバー42の先端部に設けられている。該レバー軸41は、反転胴10に回転可能に支持されており、該レバー軸41を支点としてカムレバー42はレバー軸41と一体となって回動する。このようにカムフォロア35はセグメントギア31から分離されてセグメントギア31とは異なる支軸を中心として回動するカムレバー42に設けられている。そのため、カムレバー42の動作をセグメントギア31に伝達するための伝達手段が設けられている。即ち、伝達手段として、レバー軸41とギア軸40との間には、二つのアーム部材43,44が設けられている。一方のアーム部材43は、ギア軸40に固定されてギア軸40を支点として回動し、その先端部にはカム面43aが形成されている。他方のアーム部材44は、レバー軸41に固定されてレバー軸41を支点として回動し、その先端部には一方のアーム部材43のカム面43aに当接するローラ45が取り付けられている。即ち、両アーム部材43,44からカム機構が構成されており、該カム機構を介してカムレバー42の動作がセグメントギア31に伝達される。
【0029】
尚、カムフォロア35の動作は、カムレバー42、両アーム部材43,44によって所定の倍率に増幅されてセグメントギア31に伝達される。
【0030】
また、この子爪26用のギア軸40は、反転胴10の反対側の端面に配置された親爪25用のグリッパ駆動装置におけるギア軸(図示省略)と同軸状に配置されており、両ギア軸間には捻りバネとしてのトーションバー(図示省略)が接続されている。そして、トーションバーのバネ力によって、ローラ45と一方のアーム部材43のカム面43aとの接触状態が維持され、また、カムフォロア35,36はカム部材33,34のカム面に押し付けられる。
【0031】
尚、反転胴10の回転方向は図3に示す矢印P方向である。従って、子爪26側のカムフォロアは、反転グリッパ13に対して反転胴10の回転方向前方側に位置する。逆に、親爪25側のカムフォロアは、反転グリッパ13に対して反転胴10の回転方向後方側に位置する。
【0032】
次に、カム部材について説明する。左右両フレーム21,22の内側にはそれぞれ子爪26用のカム部材33と親爪25用のカム部材34が設けられている。これらのカム部材33,34の外周面には、片面印刷用のカム面33a,34aと両面印刷用のカム面33b,34bとが、反転胴10の軸線方向に沿って並設されている。そして、両面印刷と片面印刷との切り替えに際して、両カム部材33,34を反転胴10の軸線方向に沿って移動させることにより、カムフォロア35,36が当接するカム面を切り替えるようになっている。このカム部材33,34の移動は例えばエアシリンダ等の公知の駆動手段によって行われる。このように、カムフォロア35,36が当接するカム面を切り替えることによって、片面印刷と両面印刷とで異なる駆動制御を行う。尚、子爪26用のカム部材33においては、片面印刷用カム面33aが両面印刷用カム面33bの軸線方向外側に位置するのに対して、親爪25用のカム部材34においては、逆に、片面印刷用カム面34aは両面印刷用カム面34bの軸線方向内側に位置する。
【0033】
より詳細に説明すると、子爪26用のカム部材33を反転胴10の軸線方向内側から見ると図4(イ)のようになる。カムフォロア35は反転胴10の回転に伴ってカム面上を矢印P方向に走行する。片面印刷の場合、圧胴7への引き渡し位置Bにおいてカム面33aは最大高さに近い高さとなり、子爪26は引き渡しの姿勢をとる。その後、カム面33aの高さが低くなるのに応じて子爪26は、一旦、反転胴10の回転方向前方側に、即ち、爪が開く方向に、トーションバーのバネ力によって旋回する。その後、貯え胴9からの受け取り位置A1に向けてカム面33aの高さが徐々に高くなるにつれて子爪26は爪が閉じる方向に旋回し、受け取り位置A1においてカム面33aは最大高さに近い高さとなって子爪26は受け取りの姿勢をとる。受け取り位置A1から引き渡し位置Bの間は、カム面33aは最大高さであり、子爪26は枚葉紙を強く把持した状態を維持する。一方、両面印刷の場合、引き渡し位置Bから点Cまでは片面印刷のときと同じ姿勢をとるが、点Cからは片面印刷のカム面33aよりも更にその高さが低くなって受け取り位置A2において最小高さとなり、受け取り位置A2を過ぎると逆に徐々にカム面33bの高さは高くなって、途中の点Cで最大高さとなった後に引き渡し位置Bまで最大高さが維持される。尚、両面印刷と片面印刷とで受け取り位置が異なるのは、駆動軸24の位置を基準にしているためである。
【0034】
一方、親爪25用のカム部材34を反転胴10の軸線方向内側から見ると図4(ロ)のようになる。カムフォロア36は反転胴10の回転に伴ってカム面上を矢印P方向に走行する。片面印刷の場合、受け取り位置A1から引き渡し位置Bにかけて、カム面34aは最小高さにあってカムフォロア36はそのカム面34aから浮いた状態にある。これは親爪25は、カム面が所定値よりも低くなるとストッパ60に当接した状態となるからである。引き渡し位置Bを過ぎた後、点Cにおいてカム面34aは最大高さとなる。点Cを境にしてそれ以前では親爪25はストッパ60から離れる方向に旋回し、それ以後は逆にストッパ60に接近する方向に旋回する。一方、両面印刷には、点C以降更にカム面34bは高くなって受け取り位置A2で最大高さとなった後、徐々にカム面34bの高さは低くなって所定位置(点C)で最小高さとなって引き渡し位置Bとなる。
【0035】
尚、カム面の切り替えは、両面印刷用カム面と片面印刷用カム面とが同じ高さになったところで行う。具体的には、一つのカム部材につき、カムフォロアが180度対向して一対あるので、点Cで行う。但し、点Dでもよい。
【0036】
そして、子爪26用のカム部材33は、片面印刷用カム面33aの軸線方向外側に更に調整用カム面33cを備えている。この調整用カム面33cは、片面印刷時に枚葉紙を受け取る際の反転グリッパ13の姿勢を、片面印刷時における受け取り位置A1とは異なる位置において擬似的に再現するためのものである。この調整用カム面33cには、片面印刷用カム面33aの受け取り位置A1と同じ高さの擬似紙受け渡し部Gが設けられている。該擬似紙受け渡し部Gは引き渡し位置Bから片面印刷時における受け取り位置A1までの間に設けられている。尚、擬似紙受け渡し部Gは、点であってもよいが、所定の角度領域を有することが好ましい。
【0037】
尚、親爪25用のカム部材34には調整用カム面は設けられていない。この反転胴10は、親爪25を径方向内側から支持するストッパ60を備えており、片面印刷時の受け取り位置A1では親爪25はストッパ60に当接した姿勢をとる。従って、受け取り位置A1における親爪25の姿勢はカム面34aの形状とは無関係にストッパ60によって決まる。従って、ギャップ調整の際には、親爪25側のカムフォロア36をカム部材34から外してフリー状態とすればよいため、親爪25用のカム部材34には調整用カム面が設けられていない。
【0038】
尚、片面印刷用カム面33aから調整用カム面33cへの切り替えは、後述する方法によってカムフォロア35自体を軸線方向に移動させることにより行う。まず、片面印刷用カム面34aの点Eにおいて親爪25側のカムフォロア36を軸線方向内側に移動させてフリー状態とする。そして、子爪26側のカムフォロア35を片面印刷用カム面33aの点Eにおいて軸線方向外側に移動させて、片面印刷用カム面33aから調整用カム面33c側に移動させる。尚、親爪25側、子爪26側共に、カムフォロア35,36は点Eにおいては片面印刷用カム面33a,34aには当接せずに浮いた状態にあるため、楽にカムフォロア35,36を移動させることができる。両爪25,26は所定角度以上には開くことができない構成となっており、点Eにおいては、親爪25がストッパ60に当接した状態にあると共に、子爪26側の片面印刷用カム面33aの高さは、最大開き角度に相当する高さよりも更に低くなっているため、点Eにおいては子爪26用のカムフォロア35は浮いた状態になるのである。
【0039】
次に、ギャップ調整の際にカムフォロア35,36を軸線方向に移動させる方法について説明する。
図5及び図6のように、反転胴10の外周面には、該外周面の他の領域と分離された分離可動部50が設けられている。この分離可動部50の内側にはブラケット51が固定されており、該ブラケット51に一対の軸受け部52が設けられ、該軸受け部52で前記レバー軸41が回転可能に支持されている。図5は子爪26側を示しているが、親爪25側にも同様に図6に示すように分離可動部50が設けられている。即ち、反転胴10の外周面には分離可動部50が合計四カ所設けられている。分離可動部50は通常はボルト53によって反転胴10の内側壁54に固定されていて外周面の他の領域と一体となって回転する。
【0040】
また、反転胴10の内側壁54と分離可動部50との間には、反転胴10の内側壁54に回転軸55が挿入されて内側壁54に回転可能に支持された円盤状の回転体56が設けられている。回転軸55は回転体56の中心に位置する一方、回転体56の外面には回転軸55から偏心した位置に六角ボルト57がその頭部を突出させるようにして螺着している。そして、分離可動部50には、周方向に長い長孔58が貫通形成され、該長孔58に六角ボルト57の頭部が係合している。そして、ボルト53を緩めた状態で、工具を六角ボルト57の頭部に係入して時計回りの回転トルクを六角ボルト57に付与すると、回転体56は回転軸55を中心として略180度回転して、分離可動部50は図6(イ)の状態から図6(ロ)の状態へと反転胴10の軸線方向に移動する。上述のように、分離可動部50の内側には軸受け部52を介してレバー軸41が設けられており、従って、分離可動部50、軸受け部52、レバー軸41、カムレバー42、及びカムフォロア36は一体となって軸線方向に移動し、親爪25側のカムフォロア36は図6(ロ)のようにカム部材34から軸線方向内側に離反する。移動させた後は、ボルト53を締め込んで分離可動部50をその位置に固定させる。子爪26側も同様であって、親爪25側のカムフォロア36を分離可動部50と共に移動させた後、子爪26側のカムフォロア35も分離可動部50と共に図5(イ)に示す状態から図5(ロ)に示す状態へと軸線方向外側に移動させて調整用カム面33cに対峙させる。
【0041】
以上のように構成されたグリッパ駆動装置にあっては、擬似紙受け渡し部Gを有する調整用カム面33cを別途設けているため、両面印刷用カム面33bや片面印刷用カム面33aに擬似紙受け渡し部Gを形成する必要がなくなり、両印刷用カム面33a,33bの設計の自由度が高まる。特に、本実施形態のように動きの大きな反転グリッパ13であって且つ反転胴10が倍胴であるため、調整用カム面33cを別途設けることの効果は大きい。
【0042】
また、図8(ロ)の如く擬似紙受け渡し部Gが反転胴10の上部に位置するため、ギャップ調整の作業性が良好となる。
【0043】
更に、カムフォロア35,36を移動させる際に、レバー軸41とその軸受け部52とを一体に移動させる構成としているため、カムフォロア35,36を移動させることに起因した反転グリッパ13の動作の変化を防止することができる。軸受け部52を移動させずにレバー軸41のみを移動させることも可能であるが、レバー軸41の軸受け部52による支持位置が軸線方向に変化することが原因となって、軸受け部52によるレバー軸41の支持状態に変化が生じて反転グリッパ13の動作も変化するおそれがあるため、レバー軸41と軸受け部52とを一体的に移動させることが好ましい。
【0044】
また、分離可動部50も一体的に移動させる構成としているため作業性が良い。即ち、軸受け部52は反転胴10の外周面の内側に位置しているため、一般には外部から軸受け部52をレバー軸41と共に移動させることは容易ではないが、分離可動部50を設けてその分離可動部50を軸受け部52と一体に移動させることにより作業性が改善されるのである。
【0045】
尚、カムフォロア35,36を手動にて移動させる構成を説明したが、駆動手段によって自動的に移動させる構成であってもよい。また、カム部材33,34側を移動させてもよい。
【0046】
尚、通常の片爪タイプのグリッパ11を駆動制御するグリッパ駆動装置にも無論適用可能である。但し、片爪タイプのグリッパ11よりも両爪タイプの反転グリッパ13の方が動きが大きいため、反転グリッパ13用のグリッパ駆動装置において効果が大きい。また、単胴にも適用可能であるが、上述したような倍胴や、三倍胴以上の胴において効果が大きい。
【0047】
【発明の効果】
以上のように、調整用カム面を印刷用カム面とは別に設けたことにより、印刷用カム面の設計が容易となるうえに、枚葉紙の受け渡しのタイミングを調整するために行うグリッパのギャップ調整作業が容易となる。
【図面の簡単な説明】
【図1】両面印刷機を示す概略正面図。
【図2】同印刷機の反転胴を示す概略平面図。
【図3】同反転胴を軸線方向から見た概略図。
【図4】(イ)は子爪側のカム部材、(ロ)は親爪側のカム部材をそれぞれ示す。
【図5】反転胴の要部断面図であって、(イ)は片面印刷時を示し、(ロ)はギャップ調整時を示す。
【図6】反転胴の要部平面図であって、(イ)は片面印刷時を示し、(ロ)はギャップ調整時を示す。
【図7】反転グリッパを示す断面図。
【図8】反転グリッパの動作を示し、(イ)は両面印刷時を、(ロ)は片面印刷時をそれぞれ示す。
【図9】従来のグリッパ駆動装置を示す概略図。
【符号の説明】
10…反転胴、11…グリッパ、13…反転グリッパ(グリッパ)、33,34…カム部材、33a,34a…両面印刷用カム面、33b,34b…片面印刷用カム面、33c…調整用カム面、35,36…カムフォロア、41…レバー軸(支軸)、42…カムレバー、50…分離可動部、51…ブラケット、52…軸受け部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gripper driving device, and more particularly to adjustment of sheet delivery timing.
[0002]
[Prior art]
Generally, in an offset sheet-fed printing press that uses a sheet as a printing sheet, grippers for holding the end of the sheet are provided on various cylinders.
For example, a double-sided printing machine capable of switching between single-sided printing and double-sided printing as shown in FIG. 1 includes a paper feeding unit 1, a printing unit 2, and a paper discharge unit 3, and the printing unit 2 includes two printing units 4, 4. 5 is provided. Between the printing units 4 and 5, there is provided a paper transfer unit comprising a transfer cylinder 8 (first transfer cylinder), a storage cylinder 9 (second transfer cylinder), and a reversing cylinder 10; The sheet is delivered from the impression cylinder 6 of the printing unit 4 on the side to the impression cylinder 7 of the printing unit 5 on the downstream side. Specifically, at the time of double-sided printing, after one surface is printed by the upstream printing unit 4, it is reversed by the reversing cylinder 10 of the paper delivery unit and delivered to the downstream printing unit 5 to remain. The other side is printed. Further, during single-sided printing, the paper delivery unit does not reverse the front and back, so that both sides of the printing units 4 and 5 are printed in multiple colors. In the case of the printing machine of FIG. 1, two colors are printed on both sides when printing on both sides, and a total of four colors are printed on one side when printing on one side.
[0003]
In the printing machine having such a configuration, each of the impression cylinders 6 and 7, the transfer cylinder 8 and the storage cylinder 9 has a nail type gripper 11 which holds the front end portion of the sheet together with a nail seat (claw base). The reversing cylinder 10 is provided with a reversing gripper 13. The reversing gripper 13 is a two-claw type gripper that grips a sheet with a parent nail and a child nail, and grips the front edge of the sheet during single-sided printing, while the rear edge of the sheet during double-sided printing. Fold the part upside down.
[0004]
Specifically, at the time of single-sided printing, as shown in FIG. 8 (b), the reverse gripper 13 is configured such that the tip of the nail faces the rear side in the rotation direction of the reverse cylinder 10 at the contact point between the storage cylinder 9 and the reverse cylinder 10. Under the posture, the front end of the sheet is received from the gripper 11 of the storage cylinder 9 and received. Then, while maintaining this posture, it rotates in the direction of arrow P together with the reversing cylinder 10, and the sheet is delivered to the impression cylinder 7 at the contact point between the reversing cylinder 10 and the downstream impression cylinder 7. Then, after turning once by a predetermined angle toward the front side in the rotation direction of the reversing cylinder 10, the turning cylinder 9 is swung toward the rear side in the rotation direction of the reversing cylinder 10 in front of the contact point with the storage cylinder 9. Hold the front edge of the sheet at the point of contact. On the other hand, at the time of double-sided printing, as shown in FIG. 8 (a), the reverse gripper 13 is in a position where the tip of the nail faces the front in the rotational direction of the reverse cylinder 10 at the contact point with the storage cylinder 9. The rear end of the sheet held by the paper suction device 12 of the storage cylinder 9 is gripped. Then, in accordance with the rotation of the reversing cylinder 10, the sheet is turned approximately 180 degrees toward the rear side in the rotation direction of the reversing cylinder 10 to invert the sheet, and the sheet is delivered at the contact point with the impression cylinder 7. . Thereafter, the reversing gripper 13 is located between the contact point with the impression cylinder 7 and the contact point of the storage cylinder 9 so that the tip of the claw again faces the front side in the rotation direction of the reversal cylinder 10 at the contact point with the storage cylinder 9. And turn about 180 degrees toward the front side in the rotational direction of the reversing cylinder 10.
[0005]
As such a gripper driving device for driving and controlling the reversing gripper 13, for example, one disclosed in Japanese Patent Publication No. 56-2017 is known. As shown in FIG. 9, the reversing gripper 13 is attached to the drive shaft 24 and rotates around the drive shaft 24 to perform an opening / closing operation and a turning operation. That is, the gripper driving device includes a pinion 29 attached to the end of the driving shaft 24 and a segment gear 31 (driving gear) having a tooth portion 31 a that meshes with the pinion 29. The segment gear 31 is provided to be rotatable about a gear shaft 40 that is pivotally supported on the end surface of the reversing cylinder 10. A cam follower 35 is attached to the segment gear 31, and the cam follower 35 is disposed on the cam surface 33 a of a disc-shaped cam member (not shown) fixed inside the frame (not shown). The segment gear 31 oscillates about the gear shaft 40 by traveling according to the rotation of. As the segment gear 31 swings in this way, the drive shaft 24 rotates by a predetermined angle, and the reversing gripper 13 performs the opening / closing operation and the turning operation as described above.
[0006]
As described above, since the operation of the reverse gripper 13 is different between double-sided printing and single-sided printing, the gripper driving device includes a double-sided printing cam surface and a single-sided printing cam surface, and the cam surface with which the cam follower 35 abuts. The reverse gripper 13 is driven and controlled according to the printing state.
[0007]
By the way, in such various grippers, the timing when delivering the sheet is important. That is, the timing when the sheet is received from the upstream cylinder and when the sheet is delivered to the downstream cylinder is important. If there is a deviation in the delivery timing, a delivery failure may occur. Therefore, if there is a deviation in the timing, adjustment is necessary. Further, since the grippers are arranged side by side along the axial direction of the cylinder, it is necessary to adjust the timing for each gripper so that the grippers can open and close all at once and deliver the sheets.
[0008]
Such delivery timing adjustment is performed by adjusting a delivery position, that is, a gap between the gripper claw at the delivery position and the delivery position. The gap between the claws of the gripper is a gap between the nail and the nail seat (nail base) in the case of the one-nail type, and is a gap between both claws in the case of the both-nail type. For example, in the case of the two-claw type, when the gap between the two claws at the receiving position is larger than a predetermined value, the timing of receiving the sheet becomes later than the regular one, and conversely, the gap is smaller than the predetermined value. In some cases, the timing for receiving the sheet is faster than the regular one. Therefore, it is necessary to adjust so that the gap becomes a predetermined value at the delivery position.
[0009]
For this gap adjustment, a sheet of a predetermined thickness (for example, a thickness of 0.08 mm) generally called a reference sheet is used. Taking the case of the two-claw type as an example, the reference paper is inserted between the two claws at the delivery position, so that the gap at the delivery position is adjusted to be substantially the same as the thickness of the reference paper. This gap adjustment may be performed at one of the receiving position and the delivery position, and is generally performed at the receiving position side in order to adjust the delivery timing sequentially from the upstream side along the paper feed.
[0010]
For example, in the case of the reverse gripper 13 as described above, the sheet is received from the gripper 11 of the storage cylinder 9 at the contact point with the storage cylinder 9, and the reference paper is used at the reception position from the storage cylinder 9. Thus, the gap between the claws of the reverse gripper 13 is adjusted.
[0011]
[Problems to be solved by the invention]
However, the vicinity of the contact point with the storage cylinder 9 is a place that is inherently difficult to perform because the space for inserting the adjustment tool between the storage cylinder 9 and the reversing cylinder 10 is narrow. In addition, as can be seen from FIG. 1, since the receiving position from the storage cylinder 9 is located at the lower part of the printing press, the operator has to perform the gap adjustment work so as to sink under the reversing cylinder 10. Therefore, extremely large labor is required for adjusting the gap at the receiving position.
[0012]
In order to reduce such a work burden, the shape of the cam surface is devised so that the reverse gripper 13 can reproduce the posture in which the sheet is received at a position different from the actual receiving position. Therefore, it is conceivable to adjust the gap at that position.
[0013]
Specifically, a pseudo paper delivery position where the reverse gripper 13 takes the same posture as the delivery position is provided between the delivery position to the impression cylinder 7 and the receipt position from the storage cylinder 9. Therefore, in addition to the portion corresponding to the transfer position to the impression cylinder 7 and the portion corresponding to the receiving position from the storage cylinder 9, the cam surface has a portion having the same displacement amount as the cam follower displacement amount in those portions. A cam follower is brought into contact with the portion corresponding to the pseudo paper delivery position, which is formed separately, and the gap of the reverse gripper 13 is adjusted in this state.
[0014]
In this way, by forming a pseudo paper delivery portion on the cam surface for pseudo reproduction at a position different from the delivery position of the gripper when delivering the sheet during printing, it is easy to work. Since the gap can be adjusted at the pseudo paper delivery position, workability is improved.
[0015]
However, there is a problem in that it is not easy to design the cam surface to form the pseudo paper delivery portion on one cam surface. In particular, the reversing gripper 13 is of a double-claw type and its center of rotation is substantially located on the outer peripheral surface of the reversing cylinder 10, so that the operation from the delivery position to the receiving position is compared to a normal one-claw type gripper. The cam surface for the reverse gripper is more complicated in shape than the cam surface for the one-nail gripper. Therefore, it is practically extremely difficult to provide a pseudo paper delivery portion on a cam surface that is more complicated than the one-nail type. Also, in the case of a cylinder in which grippers are arranged at a plurality of locations at intervals in the circumferential direction, i.e., a cylinder of a double cylinder or more, a plurality of cam followers are required corresponding to the number of gripper arrangement locations. A plurality of cam followers travel simultaneously on the cam surface. Therefore, there are more restrictions on the design of the cam surface than the cam surface in the case of a single cylinder, and in that case as well, it is very difficult to separately form a pseudo paper delivery portion on one cam surface.
[0016]
In any case, there is a problem that it is not easy to design the cam surface if a dummy paper transfer portion is additionally provided on the printing cam surface for controlling the operation of the gripper during printing.
[0017]
Therefore, the present invention has been made in view of the above-described conventional problems, can easily adjust the timing of sheet delivery, and design a printing cam surface for controlling the operation of the gripper during printing. It is an object of the present invention to provide a gripper driving device that is easy to handle.
[0018]
[Means for Solving the Problems]
The present invention has been made to solve the above-mentioned problems, and a gripper driving device according to the present invention provides a printing cam surface for controlling the operation of a gripper for gripping a sheet of paper during printing, and rotation of a cylinder. And a cam follower that travels on the cam surface. The gripper driving device is configured to drive and control the gripper by the movement of the cam follower. The gripper driving device includes an adjustment cam surface separately from the printing cam surface. The cam surface on which the cam follower comes into contact is provided on the cam surface for pseudo reproduction of the gripper posture when delivering a sheet at the time of printing at a position different from the delivery position at the time of printing. Can be switched between a printing cam surface and an adjustment cam surface.
[0019]
In particular, a support shaft rotatably supported by a bearing portion provided on the body and a cam lever fixed to the support shaft are provided. The cam lever is provided with a cam follower, and the support shaft and the bearing portion are switched when the cam surface is switched. And move together.
[0020]
Further, the outer peripheral surface of the barrel is provided with a separation movable portion separated from other regions of the outer peripheral surface, and a bearing portion is provided inside the separation movable portion, and the separation movable portion and the bearing are switched when the cam surface is switched. It is preferable that the part moves together.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the description of the same components as those of the conventional one is omitted, and the portions having substantially the same functions are the same. The code | symbol is attached | subjected.
[0022]
In FIG. 1, both the upper and lower impression cylinders 6 and 7 are double cylinders, the transfer cylinder 8 and the reverse cylinder 10 are also double cylinders, and the storage cylinder 9 is a triple cylinder. Accordingly, a total of three grippers 11 and paper adsorbing devices 12 are arranged on the storage cylinder 9 at intervals of about 120 degrees, and the gripper 11 for gripping the front end portion of the sheet is approximately 180 on the transfer cylinder 8. The reversing cylinder 10 is disposed with a reversing gripper 13 facing the front end of the sheet during single-sided printing and the reversing gripper 13 that grips the rear end of the sheet during double-sided printing. Yes.
[0023]
The reversing cylinder 10 shown in FIG. 2 is configured to rotate integrally with the rotating shaft 20, and the rotating shaft 20 is rotatably supported by the left and right frames 21 and 22 via bearings 23. The inversion cylinder 10 includes a pair of drive shafts 24 to which the inversion grippers 13 are mounted at positions facing each other at approximately 180 degrees. As shown in FIG. 2, the drive shaft 24 is parallel to the rotation shaft 20 of the reversing cylinder 10, and a plurality of reversing grippers 13 are arranged in parallel along the axial direction, and each reversing gripper 13 is the same all at once. Perform the operation.
[0024]
As shown in FIG. 7, the reverse gripper 13 is configured to hold the sheet by cooperation of the parent claw 25 and the child claw 26. The drive shaft 24 includes a claw tube 27 and a claw shaft 28 that is coaxially inserted into the claw tube 27. The claw tube 27 is for driving and controlling the child claw 26, and the claw shaft 28 is for driving and controlling the parent claw 25. Therefore, the parent claw 25 is fixed to the claw shaft 28, and the child claw 26 is clawed. It is fixed to the tube 27. However, it may be fixed in reverse.
[0025]
As shown in FIG. 2, pinions 29 and 30 are attached to one end portion (left end in the drawing) of the nail tube 27 and the other end portion (right end in the drawing) of the nail shaft 28, respectively. 10 is engaged with segment gears 31 and 32 (drive gears) provided at both ends of the belt. That is, a gripper driving device for driving and controlling the child claw 26 is provided on one end side (left end in the figure) of the reversing cylinder 10, and the parent claw 25 is driven and controlled on the other end side (right end in the figure). A gripper driving device is provided. Since the gripper driving device for the child claw 26 and the gripper driving device for the parent claw 25 have substantially the same configuration except for the cam members 33 and 34, the gripper driving device for the child claw 26 will be mainly described below. explain.
[0026]
FIG. 3 shows a gripper driving device for the child claw 26. The reversing cylinder 10 is a double cylinder, and a pair of drive shafts 24 are provided so as to face each other at approximately 180 degrees. Therefore, the cam follower 35 and the segment gear 31 for the child claws 26 have a point-symmetrical positional relationship with respect to the center of the reversing cylinder 10 so that the reversing gripper 13 is driven and controlled independently for each driving shaft 24. Thus, a pair is provided so as to face each other at approximately 180 degrees.
[0027]
The segment gear 31 is formed in a fan shape of approximately 90 degrees and has a tooth portion 31 a that meshes with the pinion 29 on the outer periphery thereof. The segment gear 31 is fixed to a gear shaft 40 parallel to the drive shaft 24, and the gear shaft 40 is rotatably supported on the end surface of the reversing cylinder 10. Accordingly, the segment gear 31 rotates around the gear shaft 40 so as to be integrated with the gear shaft 40 within a predetermined angle range. The gear shaft 40 is disposed on a line connecting the drive shaft 24 and the center of the reversing cylinder 10.
[0028]
On the other hand, the cam follower 35 is provided at the tip of a cam lever 42 fixed to a lever shaft 41 (support shaft) arranged in parallel with the gear shaft 40. The lever shaft 41 is rotatably supported by the reversing cylinder 10, and the cam lever 42 rotates integrally with the lever shaft 41 with the lever shaft 41 as a fulcrum. As described above, the cam follower 35 is provided on the cam lever 42 that is separated from the segment gear 31 and rotates around a support shaft different from the segment gear 31. Therefore, transmission means for transmitting the operation of the cam lever 42 to the segment gear 31 is provided. That is, as a transmission means, two arm members 43 and 44 are provided between the lever shaft 41 and the gear shaft 40. One arm member 43 is fixed to the gear shaft 40 and rotates with the gear shaft 40 as a fulcrum, and a cam surface 43a is formed at the tip thereof. The other arm member 44 is fixed to the lever shaft 41 and rotates with the lever shaft 41 as a fulcrum, and a roller 45 that is in contact with the cam surface 43a of the one arm member 43 is attached to the distal end portion thereof. That is, a cam mechanism is constituted by both arm members 43 and 44, and the operation of the cam lever 42 is transmitted to the segment gear 31 via the cam mechanism.
[0029]
The operation of the cam follower 35 is amplified to a predetermined magnification by the cam lever 42 and both arm members 43 and 44 and transmitted to the segment gear 31.
[0030]
The gear shaft 40 for the child claw 26 is disposed coaxially with the gear shaft (not shown) in the gripper driving device for the parent claw 25 disposed on the opposite end surface of the reversing body 10. A torsion bar (not shown) as a torsion spring is connected between the gear shafts. The contact state between the roller 45 and the cam surface 43a of one arm member 43 is maintained by the spring force of the torsion bar, and the cam followers 35 and 36 are pressed against the cam surfaces of the cam members 33 and 34.
[0031]
In addition, the rotation direction of the inversion cylinder 10 is an arrow P direction shown in FIG. Accordingly, the cam follower on the side of the child claw 26 is positioned on the front side in the rotation direction of the reversing drum 10 with respect to the reversing gripper 13. On the contrary, the cam follower on the parent claw 25 side is located on the rear side in the rotation direction of the reversing drum 10 with respect to the reversing gripper 13.
[0032]
Next, the cam member will be described. A cam member 33 for the child claw 26 and a cam member 34 for the parent claw 25 are provided inside the left and right frames 21 and 22, respectively. Cam surfaces 33 a and 34 a for single-sided printing and cam surfaces 33 b and 34 b for double-sided printing are arranged side by side along the axial direction of the reversing cylinder 10 on the outer peripheral surfaces of these cam members 33 and 34. When switching between double-sided printing and single-sided printing, both cam members 33 and 34 are moved along the axial direction of the reversing cylinder 10 to switch the cam surface with which the cam followers 35 and 36 abut. The cam members 33 and 34 are moved by known driving means such as an air cylinder. Thus, by switching the cam surface with which the cam followers 35 and 36 abut, different drive control is performed for single-sided printing and double-sided printing. In the cam member 33 for the child claw 26, the cam surface 33a for single-sided printing is positioned on the outer side in the axial direction of the cam surface 33b for double-sided printing. In addition, the single-sided printing cam surface 34a is located on the inner side in the axial direction of the double-sided printing cam surface 34b.
[0033]
More specifically, when the cam member 33 for the child claw 26 is viewed from the inner side in the axial direction of the reversing drum 10, it is as shown in FIG. The cam follower 35 travels in the direction of arrow P on the cam surface as the reversing cylinder 10 rotates. In the case of single-sided printing, the cam surface 33a has a height close to the maximum height at the delivery position B to the impression cylinder 7, and the child claws 26 take the delivery posture. Thereafter, as the height of the cam surface 33a decreases, the child claw 26 is once swung by the spring force of the torsion bar in the direction of rotation of the reversing drum 10, that is, in the direction in which the claw opens. Thereafter, as the height of the cam surface 33a gradually increases toward the receiving position A1 from the storage cylinder 9, the child claw 26 pivots in the closing direction, and the cam surface 33a is close to the maximum height at the receiving position A1. The child claws 26 take a receiving posture at a height. Between the receiving position A1 and the delivery position B, the cam surface 33a has the maximum height, and the child claws 26 maintain a state in which the sheet paper is strongly gripped. On the other hand, in the case of double-sided printing, the posture from the delivery position B to the point C is the same as that for single-sided printing, but from the point C, the height becomes lower than the cam surface 33a for single-sided printing, and at the receiving position A2. On the contrary, when the receiving position A2 is passed, the height of the cam surface 33b gradually increases, and after reaching the maximum height at a point C on the way, the maximum height is maintained up to the delivery position B. The reason that the receiving position is different between double-sided printing and single-sided printing is that the position of the drive shaft 24 is used as a reference.
[0034]
On the other hand, when the cam member 34 for the parent claw 25 is viewed from the inner side in the axial direction of the reversing drum 10, it is as shown in FIG. The cam follower 36 travels in the direction of arrow P on the cam surface as the reversing cylinder 10 rotates. In the case of single-sided printing, from the receiving position A1 to the delivery position B, the cam surface 34a is at a minimum height, and the cam follower 36 is in a state of floating from the cam surface 34a. This is because the master claw 25 comes into contact with the stopper 60 when the cam surface is lower than a predetermined value. After passing the delivery position B, the cam surface 34a reaches the maximum height at the point C. Before the point C, the parent claw 25 turns in a direction away from the stopper 60, and thereafter turns in a direction approaching the stopper 60. On the other hand, for double-sided printing, after the point C, the cam surface 34b becomes higher and reaches the maximum height at the receiving position A2, and then the cam surface 34b gradually decreases in height and reaches the minimum height at a predetermined position (point C). This is the delivery position B.
[0035]
The cam surface is switched when the double-sided printing cam surface and the single-sided printing cam surface are at the same height. Specifically, since there is a pair of cam followers facing each other by 180 degrees per cam member, the operation is performed at point C. However, it may be point D.
[0036]
The cam member 33 for the child claw 26 further includes an adjustment cam surface 33c on the outer side in the axial direction of the one-side printing cam surface 33a. This adjustment cam surface 33c is used to reproduce the posture of the reverse gripper 13 when receiving a sheet during single-side printing at a position different from the receiving position A1 during single-side printing. The adjustment cam surface 33c is provided with a pseudo paper delivery portion G having the same height as the receiving position A1 of the single-sided printing cam surface 33a. The pseudo paper delivery section G is provided between the delivery position B and the reception position A1 during single-sided printing. The pseudo paper delivery unit G may be a point, but preferably has a predetermined angle region.
[0037]
The cam member 34 for the parent claw 25 is not provided with an adjustment cam surface. The inversion cylinder 10 includes a stopper 60 that supports the parent claw 25 from the inside in the radial direction, and the parent claw 25 is in contact with the stopper 60 at the receiving position A1 during single-sided printing. Accordingly, the posture of the master claw 25 at the receiving position A1 is determined by the stopper 60 regardless of the shape of the cam surface 34a. Accordingly, when adjusting the gap, the cam follower 36 on the side of the parent claw 25 only needs to be removed from the cam member 34 to be in a free state. Therefore, the cam member 34 for the parent claw 25 is not provided with an adjustment cam surface. .
[0038]
The switching from the single-sided printing cam surface 33a to the adjusting cam surface 33c is performed by moving the cam follower 35 itself in the axial direction by a method described later. First, the cam follower 36 on the side of the parent nail 25 is moved inward in the axial direction at a point E on the one-side printing cam surface 34a to be in a free state. Then, the cam follower 35 on the side of the child claw 26 is moved outward in the axial direction at the point E of the single-sided printing cam surface 33a, and moved from the single-sided printing cam surface 33a to the adjusting cam surface 33c. Note that the cam followers 35 and 36 on both the parent claw 25 side and the child claw 26 side are in a state of floating without contacting the single-sided printing cam surfaces 33a and 34a at the point E, so that the cam followers 35 and 36 can be easily attached. Can be moved. Both the claws 25 and 26 cannot be opened beyond a predetermined angle. At the point E, the parent claw 25 is in contact with the stopper 60 and the one-side printing cam on the child claw 26 side. Since the height of the surface 33a is further lower than the height corresponding to the maximum opening angle, the cam follower 35 for the child claw 26 is in a floating state at the point E.
[0039]
Next, a method for moving the cam followers 35 and 36 in the axial direction when adjusting the gap will be described.
As shown in FIGS. 5 and 6, a separation movable unit 50 separated from other regions of the outer peripheral surface is provided on the outer peripheral surface of the reversing cylinder 10. A bracket 51 is fixed inside the separation movable portion 50, and a pair of bearing portions 52 are provided on the bracket 51, and the lever shaft 41 is rotatably supported by the bearing portions 52. Although FIG. 5 shows the child claw 26 side, a separation movable portion 50 is similarly provided on the parent claw 25 side as shown in FIG. That is, a total of four separation movable parts 50 are provided on the outer peripheral surface of the reversing cylinder 10. The separation movable part 50 is usually fixed to the inner wall 54 of the reversing cylinder 10 by bolts 53 and rotates integrally with other regions of the outer peripheral surface.
[0040]
In addition, a disc-shaped rotating body is inserted between the inner wall 54 of the reversing cylinder 10 and the separation movable portion 50 and a rotation shaft 55 is inserted into the inner wall 54 of the reversing cylinder 10 and is rotatably supported by the inner wall 54. 56 is provided. The rotating shaft 55 is located at the center of the rotating body 56, and a hexagon bolt 57 is screwed onto the outer surface of the rotating body 56 at a position eccentric from the rotating shaft 55 so that its head protrudes. A long hole 58 that is long in the circumferential direction is formed through the separation movable unit 50, and the head of the hexagon bolt 57 is engaged with the long hole 58. Then, when the tool is engaged with the head of the hexagon bolt 57 and the clockwise rotational torque is applied to the hexagon bolt 57 with the bolt 53 loosened, the rotating body 56 rotates about 180 degrees around the rotation shaft 55. Then, the separation movable part 50 moves in the axial direction of the reversing cylinder 10 from the state of FIG. 6 (a) to the state of FIG. 6 (b). As described above, the lever shaft 41 is provided on the inner side of the separation movable portion 50 via the bearing portion 52. Accordingly, the separation movable portion 50, the bearing portion 52, the lever shaft 41, the cam lever 42, and the cam follower 36 are provided. The cam follower 36 on the side of the parent claw 25 moves away from the cam member 34 inward in the axial direction as shown in FIG. After the movement, the bolts 53 are tightened to fix the separation movable unit 50 at the position. The same applies to the child claw 26 side. After the cam follower 36 on the parent claw 25 side is moved together with the separation movable part 50, the cam follower 35 on the child claw 26 side is also moved together with the separation movable part 50 from the state shown in FIG. The state shown in FIG. 5 (b) is moved outward in the axial direction so as to face the adjusting cam surface 33c.
[0041]
In the gripper driving device configured as described above, since the adjustment cam surface 33c having the pseudo paper delivery portion G is separately provided, the pseudo paper is provided on the double-sided printing cam surface 33b or the single-sided printing cam surface 33a. There is no need to form the transfer portion G, and the degree of freedom in designing both the printing cam surfaces 33a and 33b is increased. In particular, since the reversing gripper 13 has a large movement as in the present embodiment and the reversing cylinder 10 is a double cylinder, the effect of separately providing the adjusting cam surface 33c is great.
[0042]
Further, as shown in FIG. 8 (b), since the pseudo paper delivery portion G is located at the upper part of the reversing cylinder 10, the workability of the gap adjustment is improved.
[0043]
Further, when the cam followers 35 and 36 are moved, the lever shaft 41 and the bearing portion 52 are integrally moved, so that the change in the operation of the reversing gripper 13 due to the movement of the cam followers 35 and 36 is changed. Can be prevented. Although it is possible to move only the lever shaft 41 without moving the bearing portion 52, the lever position by the bearing portion 52 is changed because the support position of the lever shaft 41 by the bearing portion 52 changes in the axial direction. Since the support state of the shaft 41 may change and the operation of the reversing gripper 13 may also change, it is preferable to move the lever shaft 41 and the bearing portion 52 integrally.
[0044]
Moreover, since the separation movable part 50 is also moved integrally, workability is good. That is, since the bearing portion 52 is located inside the outer peripheral surface of the reversing cylinder 10, it is generally not easy to move the bearing portion 52 together with the lever shaft 41 from the outside. The workability is improved by moving the separation movable part 50 integrally with the bearing part 52.
[0045]
In addition, although the structure which moves the cam followers 35 and 36 manually was demonstrated, the structure automatically moved by a drive means may be sufficient. Moreover, you may move the cam members 33 and 34 side.
[0046]
Needless to say, the present invention can also be applied to a gripper driving device that drives and controls a normal one-nail gripper 11. However, since the movement of the two-jaw type inverted gripper 13 is larger than that of the one-jaw type gripper 11, the effect of the gripper driving device for the inverted gripper 13 is great. Although it can be applied to a single cylinder, the effect is great in a double cylinder as described above, or a triple cylinder or more.
[0047]
【The invention's effect】
As described above, the adjustment cam surface is provided separately from the printing cam surface, so that the design of the printing cam surface is facilitated and the gripper for adjusting the timing of sheet delivery is adjusted. Gap adjustment work becomes easy.
[Brief description of the drawings]
FIG. 1 is a schematic front view showing a double-sided printing machine.
FIG. 2 is a schematic plan view showing a reversal cylinder of the printing press.
FIG. 3 is a schematic view of the inversion cylinder as viewed from the axial direction.
FIGS. 4A and 4B are cam members on the child claw side, and FIG. 4B are cam members on the parent claw side.
FIGS. 5A and 5B are cross-sectional views of the main part of the reversing cylinder, in which FIG. 5A shows one-side printing and FIG. 5B shows a gap adjustment.
FIGS. 6A and 6B are plan views of the main part of the reversing cylinder, in which FIG. 6A shows one-side printing and FIG. 6B shows a gap adjustment.
FIG. 7 is a cross-sectional view showing an inverted gripper.
FIGS. 8A and 8B show the operation of the reversing gripper. FIG. 8A shows a case of duplex printing, and FIG.
FIG. 9 is a schematic view showing a conventional gripper driving device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Reverse cylinder, 11 ... Gripper, 13 ... Reverse gripper (gripper), 33, 34 ... Cam member, 33a, 34a ... Double-sided printing cam surface, 33b, 34b ... Single-sided printing cam surface, 33c ... Adjusting cam surface , 35, 36 ... cam followers, 41 ... lever shaft (support shaft), 42 ... cam lever, 50 ... separation movable part, 51 ... bracket, 52 ... bearing part

Claims (3)

枚葉紙を掴むグリッパの動作を印刷時に制御するための印刷用カム面と、胴の回転に伴ってカム面上を走行するカムフォロアとを備えて、カムフォロアの動きによってグリッパを駆動制御するように構成されたグリッパ駆動装置において、
前記印刷用カム面とは別に調整用カム面を備え、該調整用カム面に、印刷時に枚葉紙を受け渡す際のグリッパの姿勢を印刷時における受け渡し位置とは異なる位置において擬似的に再現するための擬似紙受け渡し部が設けられ、カムフォロアの当接するカム面が印刷用カム面と調整用カム面とに切り替え可能であることを特徴とするグリッパ駆動装置。
A printing cam surface for controlling the operation of the gripper for gripping a sheet at the time of printing and a cam follower that runs on the cam surface as the cylinder rotates, and the gripper is driven and controlled by the movement of the cam follower. In the configured gripper driving device,
The cam surface for adjustment is provided separately from the cam surface for printing, and the posture of the gripper when delivering a sheet at the time of printing is reproduced on the adjustment cam surface at a position different from the delivery position at the time of printing. A gripper driving device provided with a pseudo-paper delivery section for switching the cam surface on which the cam follower abuts between a printing cam surface and an adjustment cam surface.
胴に設けられた軸受け部に回転可能に支持された支軸と、該支軸に固定されたカムレバーとを備え、該カムレバーにカムフォロアが設けられ、カム面の切り替え時に支軸と軸受け部とが一体となって移動する請求項1記載のグリッパ駆動装置。A support shaft rotatably supported by a bearing portion provided on the body and a cam lever fixed to the support shaft. The cam lever is provided with a cam follower, and the support shaft and the bearing portion are provided when the cam surface is switched. The gripper driving device according to claim 1, wherein the gripper driving device moves together. 胴の外周面には、該外周面の他の領域と分離された分離可動部が設けられ、該分離可動部の内側に軸受け部が設けられ、カム面の切り替え時に分離可動部と軸受け部とが一体となって移動する請求項2記載のグリッパ駆動装置。A separation movable portion separated from other regions of the outer circumferential surface is provided on the outer peripheral surface of the barrel, a bearing portion is provided inside the separation movable portion, and when the cam surface is switched, the separation movable portion and the bearing portion are provided. The gripper driving device according to claim 2, wherein the gripper moves integrally.
JP2002096702A 2002-03-29 2002-03-29 Gripper drive device Expired - Fee Related JP3698681B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2002096702A JP3698681B2 (en) 2002-03-29 2002-03-29 Gripper drive device
US10/390,036 US20030187753A1 (en) 2002-03-29 2003-03-18 Vehicle sales support apparatus, vehicle sales support program, recording medium in which the program is recorded, and vehicle sales support method
CN 03107597 CN1223458C (en) 2002-03-29 2003-03-28 Gripper driving device
DE2003114545 DE10314545B4 (en) 2002-03-29 2003-03-31 Gripper driving device

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DE102004004515A1 (en) * 2004-01-23 2005-08-11 Steuer Gmbh Printing Technology Embossing device for transferring surface sections from a film web to a flat material
CZ298547B6 (en) * 2004-09-07 2007-10-31 Kba-Grafitec S.R.O. Method of gripping sheet of printed material and gripper mechanism for implementing such method
CN101301809B (en) 2007-05-11 2012-05-30 海德堡印刷机械股份公司 Transfer drum between printing units of a sheet-fed printing press
DE102010047807B4 (en) * 2009-10-27 2021-05-20 Heidelberger Druckmaschinen Ag Device for correcting the position of sheets
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US3443808A (en) * 1967-05-05 1969-05-13 Miller Printing Machinery Co Sheet gripper mechanism
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US4535691A (en) * 1984-09-12 1985-08-20 Komori Printing Gripper opening/closing apparatus of sheet-fed rotary press
DE19820550B4 (en) * 1998-05-08 2011-02-24 Koenig & Bauer Aktiengesellschaft Method and device for controlling by means of positive locking closing gripper on sheet-guiding cylinders
DE19820553A1 (en) * 1998-05-08 1999-11-11 Koenig & Bauer Ag Cam control for print machine paper pick-up
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