JP2617102C

JP2617102C -

Info

Publication number: JP2617102C
Authority: JP
Original assignee: Komori Corp
Current assignee: Komori Corp
Publication date: 1999-06-07

Description

【発明の詳細な説明】〔産業上の利用分野〕本発明は、枚葉輪転印刷機に関するものである。〔従来の技術〕枚葉輪転印刷機は、版の種類によって平版印刷機，凸版印刷機，凹版印刷機に
分類されるが、このうち平版印刷機は、多色刷のものを第４図に概要側面図を示
すように構成されている。同図において、印刷機１は、給紙装置２と、複数組の
印刷ユニット３と、排紙装置４とを備えており、このうちの給紙装置２は、紙５
を積載して自動的に上昇する紙積台６と、紙５の上方に配設され紙５を上層のも
のから１枚ずつ吸引して差板７上へ送り出す図示しないサッカ装置および搬送装
置を備えている。また、各印刷ユニット３は、互いに対接する版胴８、ゴム胴９
、圧胴１０をそれぞれ備えており、隣接する印刷ユニット３の圧胴１０間には、
渡し胴１１と倍径の渡し胴１２とが互いの周面を対接させて配設されている。さ
らに、１色目の圧胴１０の斜め上方には、スイング装置１３が設けられており、
また最終の圧胴１０には、排紙胴１４が対接している。１５は排紙胴１４と同軸
上に軸着された左右一対のスプロケットであって、このスプロケット１５と、排
紙フレーム１６の前端部に配設された左右一対のスプロケット１７との間には、
左右一対の排紙チェーン１８が、変向スプロケット１９等で変向されて張架され
ており、左右の排紙チェーン１８間に一定の間隔をおいて支架された各爪竿（図
示せず）上には、それぞれ複数個の排紙爪（図示せず）が並設されている。排紙
チェーン１８の搬送終端部の下方には、紙５を積載して自動的に下降する紙積台
２０が設けられている。そして、これらの各装置はモータ２１により１色目の渡
し胴１２側から駆動される。このように構成されていることにより、図示しないサッカ装置で吸引された紙
積台６上の最上紙５は、差板７上へ送り出されてスイング装置１３で１枚ずつく
わえられ圧胴１０の爪にくわえ替えられる。このあと、圧胴１０と渡し胴１１，１２との爪でくわえ替えられながら搬送される紙５には、各色のゴム胴９と圧胴
１０との間を通過するときに、版面からゴム胴９のブランケット面に転写された
画像が転写されることにより印刷が施される。最終色の画像が印刷された紙５は
、排紙胴１４の協働により圧胴１０の爪から排紙チェーン１８の排紙爪にくわえ
替えられ、図に矢印で示す方向に走行する排紙チェーン１８で搬送されたのち、
搬送終端部で爪のくわえから解放されて紙積台２０上に積載される。このような印刷作業においては、種々の原因により見当不良や油汚れ、裏移り
が発生することがあり不正紙が出るので、この不正紙がそのまま正常紙に混って
積まれないように抜き取る必要がある。そこで、順次搬送されてくる各印刷物の始端から終端までの画素をセンサまた
はカメラ等で検出してその濃度値と標準画像の各画素の濃度値との差異を判定し
、その信号により不正紙を別の排紙受上に排紙させたり、あるいは不正紙に標識
をつけたりするようにした不正紙検出装置が最近開発され、使用者からこれを印
刷機に付設する要望が出てきている。〔発明が解決しようとする問題点〕しかしながら、このような不正紙検出装置を正確に動作させるためには、検出
対象物である印刷物を、検出中たるまずに緊張させる装置を設ける必要があり、
かつこの不正紙検出装置は、これを最終印刷ユニットの下流側に設ける必要があ
る。しかし、既設の印刷機にこれを付設しようとすると、大幅な改造が必要とな
り、ほとんど改造が不可能であるために、必要であっても実用化されていないの
が現状である。〔問題点を解決するための手段〕このような問題点を解決するために、本発明では印刷ユニットと排紙装置との
間に不正紙検出ユニットのフレームを介装し、追加した一部の部品と移設した既
存部品によって形成され走行する印刷紙を添接させて緊張した状態にする印刷紙
安定手段としての胴または支持板を前記フレームに設けるとともに、この胴また
は支持板によって緊張した印刷紙の印刷濃度を検出する検出装置を設けた。〔作用〕印刷後、胴または排紙チェーンで搬送される印刷紙は、胴自体または走行経路に設けた支持板に添接させることによってたるむことなく走行してその印刷濃度
を検出され、検出装置が不正紙を検出したときには信号を発してこの不正紙を別
経路へ排紙したりして正常紙と区別する。そして、この不正紙検出装置は、追加
した最小限の一部の部品と既設の排紙胴や排紙チェーン等の一部とを利用して設
けられる。〔実施例〕第１図は本発明に係る枚葉輪転印刷機を適用した多色刷平版枚葉輪転印刷機の
概要側面図であって、給紙装置と各印刷ユニットと排紙装置の大部分とは第４図
に示す不正紙検出装置を備えてない印刷機と同じ構成であるから、これと同じ符
号を付してその説明は省略する。最終段の印刷ユニット３と排紙装置４との間には、全体を符号３０で示す不正
紙検出ユニットが設けられており、この不正紙検出ユニット３０は、印刷ユニッ
ト３のフレーム３１と、排紙フレーム１６とを連結する左右のフレーム３２を備
えている。このフレーム３２には、印刷紙を安定させる手段を兼ねた搬送手段と
しての倍径渡し胴３３が軸支されており、また第４図において排紙胴１４が軸支
されていた軸受には、渡し胴３４が周面を圧胴１０と倍径渡し胴３３との周面に
対接させて軸支されている。第４図において圧胴１０に対接していた排紙胴１４
は、このユニット３０においては倍径渡し胴３３に対接して左右のフレーム３２
に軸支されており、これと同軸上に軸着された第４図と同じスプロケット１５に
は、同じく排紙チェーン１８が張架されている。そして、印刷後の紙５は圧胴１
０の爪から渡し胴３４の爪にくわえ替えられ、さらに倍径渡し胴３３の爪にくわ
え替えられて周面に添接しながら搬送されたのち排紙チェーン１８の爪にくわえ
替えられて搬送されるように構成されている。さらに、倍径渡し胴３３の上方に
は、検出装置３５が配設されており、倍径渡し胴３３に添接しながら搬送される
紙５の各画素の印刷濃度値を１枚ずつ紙の端から端まで検出し、標準画像の各画
素の印刷濃度値との差異を判定して差異があるときには信号を発するように構成
されている。なお、印刷ユニット３と排紙装置４とが載置固定されたベッド３６
，３７はフレーム３２の分だけ迫加されて連結される。以上のように構成されていることにより、印刷後の紙５は倍径渡し胴３３に添接されて搬送されるときにその印刷濃度値を検出装置３５が１枚ごとに検知し、
これが例えば油汚れや裏移り、見当ずれ等によって標準画像の濃度値と差異がで
たとき、すなわち不正紙が発生したときには信号を発する。この信号は例えばタ
イマを経て排紙装置４へ送られ、この不正紙が排紙装置４のくわえを解放する部
位へきたときに紙積台２０上とは別経路へ排紙させたり、あるいは不正紙のとこ
ろへテープを挿入したりして正常紙と不正紙とを区別するように構成されている
。この場合、紙５が倍径渡し胴３３に添接して緊張しているので、紙面が安定し
た状態にあるから正確な検出が可能である。そして、不正紙検出装置を付設するための印刷機の改造は、フレーム３２と倍
径渡し胴３３および渡し胴３４の追加と、排紙胴１４の移動だけでよく、印刷ユ
ニット３と排紙装置４とはもとより、渡し胴３４の軸受も既設のものをそのまま
利用できるので、改造が容易である。第２図は第二の発明の実施例を示す多色刷平版枚葉輪転印刷機の概要側面図で
あって、改造箇所のみを説明する。不正紙検出ユニット４０は、最終段の印刷ユ
ニット３のフレーム３１と排紙装置４のフレーム１６とを連結して追加のベッド
４１上に載置固定された左右のフレーム４２を備えており、これには倍径渡し胴
４３が軸支されている。また、倍径渡し胴４３の上流側と下流側とには、渡し胴
４４と既設の排紙胴１４とは別の、すなわち他の排紙胴４５とが対接して軸支さ
れており、渡し胴４４と同軸上のスプロケット４６と、既設のスプロケット１５
との間には爪を備えた左右一対の搬送チェーン４７が張架されている。また、他
の排紙胴４５と同軸上のスプロケット４８には、既設の排紙チェーン１８が張架
されている。４９は第１図に示すものと同じ検出装置である。このように構成されていることにより、印刷後の紙５は、圧胴１０の爪から搬
送チェーン４７の爪にくわえ替えられて搬送され、さらに倍径渡し胴４３の爪に
くわえ替えれて周面に添接しながら搬送されたのち、排紙チェーン１８の爪にく
わえ替えられて搬送される。このとき紙５は倍径渡し胴４３の周面に添接された
緊張状態で検出されるので、紙面が安定しており正確な検出が行われる。また、
改造のために追加される部品は、ベッド４１、フレーム４２、倍径渡し胴４３、
渡し胴４４、他の排紙胴４５、スプロケット４６，４８、チェーン４７だけであって、その他は既設のものを利用できるので、改造が容易である。さらに、第３図は第三の発明の実施例を示す多色刷平版枚葉輪転印刷機の概要
側面図であって、改造箇所のみを説明する。不正紙検出ユニット５０は、印刷ユ
ニット３１と排紙装置４のフレーム１６とを連結して追加のベッド５１上に載置
固定された左右のフレーム５２を備えており、排紙チェーン１８は、フレーム５
２分だけ延長されている。そして、検出装置５３は排紙チェーン１８の搬送経路
内に設けられており、その下方には、搬送される紙５を添接させて緊張した状態
にする手段として機能する支持板５４が設けられている。このように構成されていることにより、排紙チェーン１８で搬送される紙５は
、支持板５４に添接して緊張した状態で検出装置５３によって検出されるので、
正確な検出が可能である。また、不正紙検出装置を設けるための改造は、ベッド
５１とフレーム５２とを追加し、排紙チェーン１８を延長するだけであるから改
造が容易である。なお、前記各実施例においては、検出装置４５，４９，５３で検出した印刷濃
度値を、ディスプレーに表示することもできる。また、前記各実施例は、本発明
を多色刷の平版枚葉輪転印刷機に適用した例を示したが、単色刷のものや凹版印
刷機、凸版印刷機にも同様に適用することができる。〔発明の効果〕以上の説明により明らかなように本発明によれば、給紙装置と印刷ユニットと
排紙装置とを備え、排紙胴と同軸上に軸着されたスプロケットと前記排紙装置と
の間に張架された排紙装置のチェーンによって印刷紙を排紙する枚葉輪転印刷機
において、前記印刷ユニットと排紙装置との間に不正紙検出ユニットのフレーム
を介装するとともに、このフレームに倍径の渡し胴を設け、前記印刷ユニットに
前記倍径の渡し胴に隣接するように渡し胴を設け、前記排紙胴およびそのスプロ
ケットを前記排紙装置側であって前記倍径の渡し胴に隣接するように前記フレー
ムに設け、このスプロケットと排紙装置との間に前記排紙装置のチェーンを張架
し、前記倍径の渡し胴に近接して印刷紙の印刷濃度を検出する検出装置を設けた
ことにより、印刷紙は倍径の渡し胴に添接し緊張した状態で検出装置により検出
されるので、正確な不正紙の検出が可能になり印刷物の品質が向上するとともに
、既設の印刷機を、不正紙検出装置を備えた印刷機に改造する場合、既設部分をそ
のまま利用し、渡し胴、倍径の渡し胴およびフレームを追加するだけでよいので
、設備費が節減され、また不正紙検出装置の付設が容易になることにより、この
装置が広く普及するようになり、印刷物の品質が向上する。また、本発明によれば、給紙装置と印刷ユニットと排紙装置とを備え、前記印
刷ユニットの排紙胴と同軸上に軸着されたスプロケットと前記排紙装置との間に
張架された排紙装置のチェーンによって印刷紙を排紙する枚葉輪転印刷機におい
て、前記印刷ユニットと排紙装置との間に不正紙検出ユニットのフレームを介装
するとともに、このフレームに倍径の渡し胴を設け、前記排紙装置側であって前
記倍径の渡し胴に隣接するように他の排紙胴とそのスプロケットとを前記フレー
ムに設け、このスプロケットと排紙装置との間に前記排紙装置のチェーンを張架
し、前記印刷ユニット側であって前記倍径の渡し胴に隣接するように渡し胴を前
記フレームに設けるとともに、この渡し胴のスプロケットと前記印刷ユニットの
排紙胴のスプロケットとの間に搬送チェーンを張架し、前記倍径の渡し胴に近接
して印刷紙の印刷濃度を検出する検出装置を設けたことにより、既設の印刷機を
、不正紙検出装置を備えた印刷機に改造する場合、既設部分をそのまま利用し、
搬送チェーン、渡し胴、倍径の渡し胴、他の排紙胴およびフレームを追加するだ
けでよいので、設備費が節減され、また不正紙検出装置の付設が容易になる。また、本発明によれば、給紙装置と印刷ユニットと排紙装置とを備え、前記印
刷ユニットの排紙胴と同軸上に軸着されたスプロケットと前記排紙装置との間に
張架された排紙装置のチェーンによって印刷紙を排紙する枚葉輪転印刷機におい
て、前記印刷ユニットと排紙装置との間に不正紙検出ユニットのフレームを介装
するとともに、このフレームに対応させて前記チェーンを延長し、このチェーン
の延長部分に近接するとともに印刷紙を添接させて緊張した状態にする支持板を
前記フレームに支持させ、この支持板に対応した位置でチェーンに近接して印刷
紙の印刷濃度を検出する検出装置を設けたことにより、既設の印刷機を、不正紙
検出装置を備えた印刷機に改造する場合、既設部分をそのまま利用し、搬送チェ
ーンの長さを変更し、フレームおよび支持板を追加するだけでよいので、設備費
が節減され、また不正紙検出装置の付設が容易になる。 Description: FIELD OF THE INVENTION The present invention relates to a sheet-fed rotary printing press. [Prior art] Sheet-fed rotary printing presses are classified into lithographic printing presses, letterpress printing presses, and intaglio printing presses according to the type of printing plate. Among them, the lithographic printing press is a multicolor printing press shown in FIG. It is configured as shown in the figure. In FIG. 1, a printing press 1 includes a paper feeder 2, a plurality of sets of printing units 3, and a paper discharger 4, and the paper feeder 2 includes a paper 5
And a transporter (not shown) that is disposed above the paper 5 and that sucks the paper 5 one by one from the upper layer and feeds the paper 5 onto the difference plate 7. Have. Each printing unit 3 includes a plate cylinder 8 and a blanket cylinder 9 which are in contact with each other.
, An impression cylinder 10, and between the impression cylinders 10 of the adjacent printing units 3.
The transfer drum 11 and the double-diameter transfer drum 12 are arranged with their peripheral surfaces in contact with each other. Further, a swing device 13 is provided diagonally above the impression cylinder 10 of the first color.
A paper discharge cylinder 14 is in contact with the final impression cylinder 10. Reference numeral 15 denotes a pair of left and right sprockets which are coaxially mounted on the paper discharge cylinder 14, and between the sprocket 15 and a pair of right and left sprockets 17 disposed at the front end of the paper discharge frame 16.
A pair of left and right discharge chains 18 are deflected and stretched by diverting sprockets 19 and the like, and each claw rod (not shown) supported at a fixed interval between the left and right discharge chains 18. A plurality of paper ejection claws (not shown) are respectively provided on the upper side. Below the conveyance end portion of the paper discharge chain 18, a paper stacking platform 20 for stacking the paper 5 and automatically descending is provided. These devices are driven by the motor 21 from the first color transfer drum 12 side. With such a configuration, the uppermost sheet 5 on the sheet stack 6 sucked by the sucker device (not shown) is sent out onto the difference plate 7, held one by one by the swing device 13, and Can be replaced with nails. Thereafter, the paper 5 conveyed while being held between the impression cylinder 10 and the transfer cylinders 11 and 12 by the nails is transferred from the blanket cylinder to the impression cylinder 10 when passing between the impression cylinder 10 and the impression cylinder 10 of each color. Printing is performed by transferring the image transferred to the blanket surface of No. 9. The paper 5 on which the image of the final color is printed is changed from the claw of the impression cylinder 10 to the discharge claw of the discharge chain 18 by the cooperation of the discharge cylinder 14, and the discharged paper travels in the direction indicated by the arrow in the figure. After being transported by the chain 18,
The paper is released from the grip of the claw at the transport end portion and is stacked on the paper stacking platform 20. In such printing work, misregistration, oil stains, and set-off may occur due to various causes, resulting in illegal paper, so it is necessary to remove the illegal paper so that it is not mixed with normal paper as it is. There is. Therefore, the pixels from the beginning to the end of each sequentially conveyed printed matter are detected by a sensor or a camera, and the difference between the density value and the density value of each pixel of the standard image is determined. Recently, a fraudulent paper detecting device that discharges paper onto another paper receiving tray or attaches a mark to fraudulent paper has been developed, and users have been requesting to attach it to a printing press. [Problems to be Solved by the Invention] However, in order to correctly operate such an unauthorized paper detection device, it is necessary to provide a device that tensions a printed material to be detected without detection during the detection.
In addition, it is necessary to provide this unauthorized paper detection device downstream of the final printing unit. However, if it is to be attached to an existing printing press, it will require a significant remodeling, and almost no remodeling is possible. [Means for Solving the Problems] In order to solve such problems, in the present invention, a frame of an unauthorized paper detection unit is interposed between the printing unit and the paper ejection device, and some of the added frames are added. The frame is provided with a cylinder or a support plate as printing paper stabilizing means for bringing the traveling printing paper formed by the component and the transferred existing component into contact with each other to make the tension state, and the printing paper tensioned by the cylinder or the support plate. A detection device for detecting the print density of the sample was provided. [Operation] After printing, the printing paper conveyed by the cylinder or the discharge chain travels without slack by being in contact with the cylinder itself or the support plate provided on the traveling path, and its print density is detected. When detecting the illegal paper, a signal is issued and the illegal paper is discharged to another path to distinguish it from the normal paper. The unauthorized paper detection device is provided by using the added minimum part and a part of the existing paper discharge cylinder and paper discharge chain. FIG. 1 is a schematic side view of a multicolor lithographic sheet-fed rotary printing press to which a sheet-fed rotary printing press according to the present invention is applied. Has the same configuration as that of the printing press without the unauthorized paper detecting device shown in FIG. 4, and therefore the same reference numerals are given and the description thereof is omitted. Between the printing unit 3 at the last stage and the paper discharging device 4, there is provided an unauthorized paper detecting unit indicated by a reference numeral 30 as a whole. There are left and right frames 32 for connecting to the paper frame 16. The frame 32 supports a double-diameter transfer cylinder 33 as a conveying means also serving as a means for stabilizing the printing paper, and a bearing on which the discharge cylinder 14 is supported in FIG. The transfer cylinder 34 is pivotally supported with its peripheral surface in contact with the peripheral surfaces of the impression cylinder 10 and the double-diameter transfer cylinder 33. In FIG. 4, the paper discharge cylinder 14 in contact with the impression cylinder 10
In this unit 30, the left and right frames 32
A paper ejection chain 18 is also stretched over the same sprocket 15 as shown in FIG. And the paper 5 after printing is the impression cylinder 1
The claw of the transfer cylinder 34 is replaced by the claw of the transfer cylinder 34, the claw of the transfer cylinder 34 is further replaced by the claw of the transfer cylinder 34, and is conveyed while being in contact with the peripheral surface. It is configured to: Further, above the double-diameter transfer cylinder 33, a detection device 35 is disposed, and the print density value of each pixel of the paper 5 conveyed while being in contact with the double-diameter transfer cylinder 33 is determined one by one at the end of the paper. From the end to the end, determine the difference from the print density value of each pixel of the standard image, and issue a signal when there is a difference. The bed 36 on which the printing unit 3 and the paper discharge device 4 are mounted and fixed.
, 37 are connected by being increased by the amount of the frame 32. With the above-described configuration, when the printed paper 5 is conveyed while being attached to the double-diameter transfer cylinder 33, the detection device 35 detects the print density value for each sheet.
A signal is generated when a difference occurs from the density value of the standard image due to, for example, oil stain, set-off, misregistration, or the like, that is, when illegal paper occurs. This signal is sent to the paper output device 4 via, for example, a timer, and when the illegal paper arrives at the portion of the paper output device 4 where the grip is released, the illegal paper is discharged to a path different from that on the paper stacking platform 20, or the illegal paper is discharged. It is configured to discriminate between normal paper and illegal paper by inserting a tape into the paper. In this case, since the paper 5 is in tension with the double-diameter transfer cylinder 33, accurate detection is possible because the paper surface is in a stable state. Further, the remodeling of the printing press for attaching the illegitimate paper detecting device requires only the addition of the frame 32, the double-diameter transfer cylinder 33 and the transfer cylinder 34, and the movement of the discharge cylinder 14, and the printing unit 3 and the discharge device. In addition to 4, the existing bearing can be used as it is for the transfer drum 34, so that the bearing can be easily modified. FIG. 2 is a schematic side view of a multicolor lithographic sheet-fed rotary printing press showing an embodiment of the second invention, and only modified portions will be described. The unauthorized paper detection unit 40 includes left and right frames 42 fixedly mounted on an additional bed 41 by connecting the frame 31 of the printing unit 3 at the last stage and the frame 16 of the paper discharge device 4. A double-diameter transfer cylinder 43 is supported on the shaft. Further, on the upstream side and the downstream side of the double-diameter transfer drum 43, a transfer drum 44 and another discharge drum 45 different from the existing discharge drum 14, that is, another discharge drum 45 are supported in contact with each other, and are supported. A sprocket 46 coaxial with the transfer drum 44 and an existing sprocket 15
A pair of right and left transport chains 47 each having a claw are stretched between them. An existing paper ejection chain 18 is stretched around a sprocket 48 coaxial with another paper ejection cylinder 45. Reference numeral 49 denotes the same detection device as that shown in FIG. With this configuration, the printed paper 5 is conveyed by being changed from the claw of the impression cylinder 10 to the claw of the transport chain 47 and further changed by the claw of the double-diameter transfer cylinder 43. After being conveyed while being attached to the sheet, the paper is conveyed while being replaced by the claws of the paper discharge chain 18. At this time, the paper 5 is detected in a tensioned state attached to the peripheral surface of the double-diameter transfer cylinder 43, so that the paper surface is stable and accurate detection is performed. Also,
Parts added for the remodeling are a bed 41, a frame 42, a double-diameter transfer cylinder 43,
Since only the transfer cylinder 44, the other paper discharge cylinder 45, the sprockets 46 and 48, and the chain 47 can be used for the other components, remodeling is easy. FIG. 3 is a schematic side view of a multicolor lithographic sheet-fed rotary printing press showing an embodiment of the third invention, and only modified portions will be described. The unauthorized paper detection unit 50 includes left and right frames 52 which are connected and fixed to an additional bed 51 by connecting the printing unit 31 and the frame 16 of the paper discharge device 4. 5
It has been extended by two minutes. The detection device 53 is provided in the transport path of the paper discharge chain 18, and below the support device 54 is provided a support plate 54 functioning as a means for bringing the paper 5 to be transported into contact with the paper chain 5 to make the paper 5 taut. ing. With this configuration, the paper 5 conveyed by the paper discharge chain 18 is detected by the detection device 53 in a state of being in tension while being in contact with the support plate 54,
Accurate detection is possible. Further, remodeling for providing the unauthorized paper detecting device is easy because the bed 51 and the frame 52 are simply added and the discharge chain 18 is extended. In each of the above embodiments, the print density values detected by the detection devices 45, 49, and 53 can be displayed on a display. In each of the above-described embodiments, an example in which the present invention is applied to a multicolor printing lithographic sheet-fed rotary printing press is shown. However, the present invention can be similarly applied to a single-color printing, an intaglio printing press, and a relief printing press. [Effects of the Invention] As is apparent from the above description, according to the present invention, a sprocket provided with a paper feeding device, a printing unit, and a paper discharging device, and coaxially mounted on a paper discharging cylinder, and the paper discharging device In a sheet-fed rotary printing press that discharges printing paper by a chain of a paper discharging device stretched between the printing unit and a paper discharging device, a frame of an unauthorized paper detection unit is interposed between the printing unit and the paper discharging device, A transfer cylinder having a double diameter is provided on the frame, a transfer cylinder is provided on the printing unit so as to be adjacent to the transfer cylinder having the double diameter, and the discharge cylinder and its sprocket are disposed on the discharge device side and the double diameter is provided. And a chain of the paper discharging device is stretched between the sprocket and the paper discharging device, and the printing density of the printing paper is brought close to the double-diameter transferring cylinder. With the detection device to detect As the printing paper comes into contact with the double-diameter transfer cylinder and is detected by the detection device in a tensioned state, it is possible to accurately detect illegal paper, improve the quality of printed matter, and When remodeling to a printing machine equipped with a paper detection device, it is only necessary to use the existing part as it is and simply add a transfer drum, a double-diameter transfer drum and a frame. The simplicity of attachment makes this device widely available and improves the quality of printed matter. Further, according to the present invention, a paper feed device, a printing unit, and a paper ejection device are provided, and the paper ejection device is stretched between a sprocket coaxially mounted on a paper ejection cylinder of the printing unit and the paper ejection device. In a sheet-fed rotary printing press that discharges printing paper by a chain of a paper discharging device, a frame of an illicit paper detecting unit is interposed between the printing unit and the paper discharging device, and a double-diameter transfer to this frame is performed. A further discharge cylinder and its sprocket are provided on the frame so as to be adjacent to the double-diameter transfer cylinder on the discharge apparatus side, and the discharge mechanism is disposed between the sprocket and the discharge apparatus. A chain of a paper device is stretched, a transfer cylinder is provided on the frame so as to be adjacent to the double-diameter transfer cylinder on the printing unit side, and a sprocket of the transfer cylinder and a discharge cylinder of the printing unit are provided. sprocket A transport chain is stretched between the printers, and a detection device for detecting the print density of the printing paper is provided in proximity to the double-diameter transfer cylinder. When converting to a machine, use the existing part as it is,
Since it is only necessary to add a transport chain, a transfer cylinder, a double-diameter transfer cylinder, another discharge cylinder and a frame, the equipment cost is reduced, and the installation of the illegitimate paper detection device is facilitated. Further, according to the present invention, a paper feed device, a printing unit, and a paper ejection device are provided, and the paper ejection device is stretched between a sprocket coaxially mounted on a paper ejection cylinder of the printing unit and the paper ejection device. In a sheet-fed rotary printing press for discharging printing paper by a chain of a paper discharging device, a frame of an unauthorized paper detecting unit is interposed between the printing unit and the paper discharging device, and the frame is made to correspond to the frame. A support plate for extending the chain, bringing the print paper into contact with the extended portion of the chain and bringing the print paper into tension, is supported by the frame, and the print paper is provided near the chain at a position corresponding to the support plate. When the existing printing machine is converted to a printing machine equipped with an illegal paper detection device by providing a detection device that detects the print density of the printer, the existing portion is used as it is, and the length of the transport chain is changed. Since it is only necessary to add the frame and the support plate, the equipment cost is reduced, also facilitates attached fraud sheet detector device.

【図面の簡単な説明】第１図ないし第３図は本発明に係る枚葉輪転印刷機の実施例を示し、第１図は
これを適用した多色刷平版枚葉輪転印刷機の概要側面図、第２図および第３図は
それぞれ他の発明の実施例を示す多色刷平版枚葉輪転印刷機の概要側面図、第４
図は従来の多色刷平版枚葉輪転印刷機の概要側面図である。２……給紙装置、３……印刷ユニット、４……排紙装置、１４……排紙胴、１
５，４６，４８……スプロケット、１８……排紙チェーン、３０，４０，５０…
…不正紙検出ユニット、３２，４２，５２……フレーム、３３，４３……倍径渡
し胴、３４，４４……渡し胴、３５，４９，５３……検出装置、４５……他の排
紙胴、４７……搬送チェーン、５４……支持板。BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 show an embodiment of a sheet-fed rotary printing press according to the present invention, and FIG. 1 is a schematic side view of a multicolor printing plate-fed rotary printing press to which the present invention is applied; FIGS. 2 and 3 are schematic side views of a multicolor lithographic sheet-fed rotary printing press showing another embodiment of the present invention.
FIG. 1 is a schematic side view of a conventional multicolor lithographic sheet-fed rotary printing press. 2 paper feeder, 3 print unit, 4 paper discharge device, 14 paper discharge cylinder, 1
5, 46, 48 ... sprocket, 18 ... discharge chain, 30, 40, 50 ...
... Illegal paper detection unit, 32, 42, 52 ... Frame, 33, 43 ... Double diameter transfer cylinder, 34, 44 ... Transfer cylinder, 35, 49, 53 ... Detection device, 45 ... Other paper discharge Body, 47 ... Carrying chain, 54 ... Support plate.

Claims

Claims: (1) A paper ejection device which includes a paper feeding device, a printing unit, and a paper ejection device, and is stretched between a sprocket that is coaxially mounted on a paper ejection cylinder and the paper ejection device. In a sheet-fed rotary printing press that discharges printing paper by a chain of a device, a frame of an unauthorized paper detection unit is interposed between the printing unit and the discharging device, and a double-diameter transfer cylinder is provided on the frame. A transfer cylinder provided on the printing unit so as to be adjacent to the double-diameter transfer cylinder; and the frame so that the discharge cylinder and its sprocket are located on the discharge device side and adjacent to the double-diameter transfer cylinder. And a detecting device for detecting the print density of printing paper is provided in the vicinity of the double-diameter transfer cylinder by extending a chain of the paper discharging device between the sprocket and the paper discharging device. Sheet-fed rotary printing press. (2) A paper discharge device that includes a paper feed device, a printing unit, and a paper discharge device, and is stretched between a sprocket that is coaxially mounted on a paper discharge cylinder of the print unit and the paper discharge device. In a sheet-fed rotary printing press that discharges printing paper by a chain, a frame of a fraudulent paper detection unit is interposed between the printing unit and a paper discharging device, and a double-diameter transfer cylinder is provided on the frame. Another discharge cylinder and its sprocket are provided on the frame so as to be adjacent to the double-diameter transfer cylinder on the discharge device side, and the chain of the discharge device is disposed between the sprocket and the discharge device. Stretching, a transfer cylinder is provided on the frame so as to be adjacent to the double-diameter transfer cylinder on the printing unit side, and between a sprocket of the transfer cylinder and a sprocket of a discharge cylinder of the printing unit. Transport chain And a detecting device for detecting the print density of the printing paper in the vicinity of the double-diameter transfer cylinder is provided. (3) A paper discharge device that includes a paper feed device, a printing unit, and a paper discharge device, and is stretched between a sprocket that is coaxially mounted on a paper discharge cylinder of the print unit and the paper discharge device. In a sheet-fed rotary printing press that discharges printing paper by a chain, a frame of an unauthorized paper detection unit is interposed between the printing unit and a paper discharging device, and the chain is extended corresponding to the frame, A support plate that is close to the extension of the chain and brought into tension by attaching the printing paper is supported by the frame, and the printing density of the printing paper is detected close to the chain at a position corresponding to the support plate. A sheet-fed rotary printing press provided with a detecting device for detecting the rotation of a sheet.