JP5053698B2 - Paper receiving device - Google Patents

Paper receiving device Download PDF

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JP5053698B2
JP5053698B2 JP2007118320A JP2007118320A JP5053698B2 JP 5053698 B2 JP5053698 B2 JP 5053698B2 JP 2007118320 A JP2007118320 A JP 2007118320A JP 2007118320 A JP2007118320 A JP 2007118320A JP 5053698 B2 JP5053698 B2 JP 5053698B2
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paper
printing
stack
pair
holding
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JP2008273681A (en
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優輔 長田
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Duplo Seiko Corp
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本発明は、印刷機及び複写機等の画像形成装置に備えられる紙受け装置であって、画像形成部で画像形成されて排出される用紙を、紙受け台上に順次積載する紙受け装置に関する。   BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper receiving device provided in an image forming apparatus such as a printing machine and a copying machine, and to a paper receiving device that sequentially stacks papers that are formed and discharged by an image forming unit on a paper receiving table. .

画像形成装置、たとえば孔版印刷機のインクとして、従来、オイル成分を含んだウォータインオイル型のエマルジョンインクを主として使用しているが、昨今では、上記ウォータインオイル型のインクに代えて、オイル成分が0又は略0の水性インクを使用することが提案されている(たとえば特許文献1)。すなわち、オイル成分を略0とすることにより、臭いの発生を抑制して環境への影響を減らし、かつ、乾燥効率を向上させている。   Conventionally, a water-in-oil type emulsion ink containing an oil component has been mainly used as an ink for an image forming apparatus, for example, a stencil printing machine, but nowadays, an oil component is used instead of the water-in oil type ink. Has been proposed to use water-based inks having 0 or substantially 0 (for example, Patent Document 1). That is, by making the oil component substantially zero, the generation of odor is suppressed, the influence on the environment is reduced, and the drying efficiency is improved.

ところが、水性インクを用いると、前記利点が得られる反面、印刷後、インク水分が用紙表面から急速に浸潤することにより、用紙の巻き込み現象、すなわちカール現象が急速に発生する。   However, when water-based ink is used, the above-described advantages can be obtained, but after printing, ink moisture rapidly infiltrates from the surface of the paper, so that a paper entrainment phenomenon, that is, a curling phenomenon occurs rapidly.

図5はカール現象の過程を具体的に示しており、印刷用紙Pは、印刷中は、最上段(A1)に示すように平面状態であるが、印刷後、印刷用紙Pの印刷面Paがインクの浸潤で伸びることにより、第2段(A2)に示すように左右両端部が印刷面(上面)Pa側と反対側に丸く反り返り、更に、第3段(A3)に示すように、印刷用紙P全体が印刷面Pa側に向けて凸状となる逆U字状に変形する。なお、図5のように、左右両端部がカールする印刷用紙Pは、主として紙繊維が前後方向(たとえば搬送方向)に延びている用紙であり、紙繊維が左右方向(搬送方向と直交する方向)に延びる印刷用紙では、印刷後、主として、前後端部がカールする。ちなみに、図5の(A1)〜(A3)に示す印刷用紙Pの逆U字状の変化は、上面にラッカーコーティングが為されたような用紙では短時間で顕著に現れ、たとえば印刷後、1秒〜数秒間で変形する。   FIG. 5 specifically shows the process of the curl phenomenon. The printing paper P is in a flat state as shown in the uppermost stage (A1) during printing, but after printing, the printing surface Pa of the printing paper P is As shown in the second step (A2), the left and right ends are curled back to the opposite side to the printing surface (upper surface) Pa side as shown in the second step (A2), and further, as shown in the third step (A3). The entire paper P is deformed into an inverted U shape that is convex toward the printing surface Pa side. As shown in FIG. 5, the printing paper P whose left and right ends curl is mainly paper whose paper fibers extend in the front-rear direction (for example, the transport direction), and the paper fibers are in the left-right direction (a direction orthogonal to the transport direction). ), The front and rear end portions are mainly curled after printing. Incidentally, the reverse U-shaped change of the printing paper P shown in (A1) to (A3) of FIG. 5 appears remarkably in a short time on a paper whose upper surface is lacquered. Deforms in seconds to seconds.

図5の第2段(A2)又は第3段(A3)このように変形した状態又は変形途中の状態で印刷用紙Pが紙受け台上に排出されると、図6に示すように、落下方式で印刷用紙P積載する際、印刷用紙Pの左右両端部を内側に巻き込んだ状態で積載され、印刷用紙Pの揃えが悪くなると共に印刷用紙Pの品質も低下する。勿論、印刷用紙Pの積載面の高さを一定に保つことも困難になる。   Second stage (A2) or third stage (A3) in FIG. 5 When the printing paper P is discharged onto the paper tray in such a deformed state or in the middle of the deformation, as shown in FIG. When the printing paper P is stacked by this method, the printing paper P is stacked with the left and right ends of the printing paper P being wound inside, so that the alignment of the printing paper P is deteriorated and the quality of the printing paper P is deteriorated. Of course, it becomes difficult to keep the height of the loading surface of the printing paper P constant.

また、印刷後、殆ど時間を置かずに用紙を紙受け台100上に積載してゆく構造では、インクの乾燥が十分でないため、積載時に隣り合う印刷用紙Pにインクの裏写りが生じ、用紙を汚すことすことが多い。   Further, in the structure in which the paper is stacked on the paper tray 100 with little time after printing, since the ink is not sufficiently dried, the ink print-through occurs on the adjacent print paper P when the paper is stacked, and the paper Often dirty.

上記カール発生を防止すると共に乾燥を促進するために、従来、幾つかのカール発生防止等の装置が開発されている。そのうちの一つ(特許文献2)として、紙受け台(パイル)の上方の用紙先端縁近傍に配置されて用紙と平行に空気を吹き出す空気吹き出し装置と、前記紙受け台の上方及び搬出装置の上方に配置されて略垂直下向きに空気を送るファン等とを有するカール発生防止装置がある。このカール発生防止装置によると、空気吹き出し装置及びファン等からの吹き出し空気で用紙を押さえ、用紙のカール発生を防ぐことができる。また、吹き付け空気により、乾燥を促進させることができる。   In order to prevent the curling and promote the drying, several devices for preventing the curling have been developed. As one of them (Patent Document 2), an air blowing device that is disposed near the leading edge of the paper above the paper cradle (pile) and blows air in parallel with the paper, and above the paper cradle and the carry-out device 2. Description of the Related Art There is a curl prevention device that includes a fan or the like that is disposed above and sends air substantially vertically downward. According to this curl prevention device, it is possible to prevent the paper from curling by pressing the paper with air blown from an air blower or a fan. Moreover, drying can be accelerated | stimulated with blowing air.

特開2005−272513号公報JP 2005-272513 A 特開昭58−31831号公報JP 58-31831 A

前記従来例(特許文献2)の紙受け装置のように、排紙装置から排出される印刷用紙に、単に空気を吹き付けるだけの構造では、印刷用紙のカールの発生を抑制することはできるが、短時間で印刷用紙が積載されるので、乾燥時間を十分に稼ぐことはできず、積載時に隣り合う用紙にインクの裏写りが生じるのを防ぐ効果は小さい。   As in the conventional paper receiving device (Patent Document 2), the structure in which air is simply blown onto the printing paper discharged from the paper discharging device can suppress the curling of the printing paper. Since printing sheets are stacked in a short time, the drying time cannot be sufficiently obtained, and the effect of preventing ink show-through on adjacent sheets during loading is small.

本件出願の発明者は、印刷用紙の特性に関し、図5の第3段(A3)のように印刷用紙Pが逆U字状のカールした後、数十秒経つと、今度は第4段(A4)に示すように、平面状態に戻るように印刷用紙の左右端部が上向きにカールすることに着目し、この特性を利用して、印刷直後のカールの発生の防止と共に、インクの乾燥時間の確保が十分にできる紙受け装置を提供しようとしたものである。   The inventor of the present application relates to the characteristics of the printing paper, and after several tens of seconds after the printing paper P curls in an inverted U shape as shown in the third stage (A3) in FIG. As shown in A4), attention is paid to the fact that the left and right edges of the printing paper curl upward so as to return to the flat state, and this characteristic is used to prevent the occurrence of curling immediately after printing and to dry the ink. It is an object of the present invention to provide a paper receiving apparatus that can sufficiently ensure the above.

上記課題を解決するため、本願請求項1記載の発明は、画像形成部で画像形成された用紙を、紙受け台31上に積層状態で載置する紙受け装置において、前記紙受け台31の上方位置に、前記画像形成部で画像形成された用紙を、一時的に保持し、所定時間経過後に紙受け台上に放出する中間スタック装置40を配置しており、前記中間スタック装置40は、用紙幅方向に間隔をおいて立設された1対の支持脚42と、両支持脚42に回動軸45を介して回動自在に支持された1対の保持板41と、両保持板41を、略水平な保持位置と下方に垂下する放出位置との間で駆動する駆動アクチュエータ46と、を備えており、さらに、該中間スタック装置40の上方に、該中間スタック装置上の用紙の四隅部分S1に対し、それぞれ上方から空気を吹き付ける送風機構50を配置している。 In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is a paper receiving device for placing the paper on which the image is formed by the image forming unit on the paper receiving base 31 in a stacked state. An intermediate stack device 40 that temporarily holds the paper on which the image has been formed by the image forming unit and discharges the paper onto a paper tray after a predetermined time has elapsed is disposed at an upper position. A pair of support legs 42 erected at intervals in the paper width direction, a pair of holding plates 41 supported by both support legs 42 via a rotation shaft 45, and both holding plates 41, and a drive actuator 46 for driving between a substantially horizontal holding position and a discharge position depending downward, and further, above the intermediate stack apparatus 40, the sheet of paper on the intermediate stack apparatus 40 Check to four corners S1, from above, respectively It is arranged a blower mechanism 50 for blowing.

上記構成によると、画像形成部から排出された画像形成済みの用紙を、一旦、中間スタック装置で保持し、かつ、所定時間、送風機構で強制的に平面状態を維持した状態を保つので、印刷用紙自身の特性により前記図5の第4段(A4)に示すように平面状に戻る時間を稼ぐことができ、自然状態で平面状に戻った用紙を紙受け台に放出することができる。これにより、用紙を、紙受け台上に整然と積載することができる。   According to the above configuration, the image-formed paper discharged from the image forming unit is temporarily held by the intermediate stack device, and the flat state is forcibly maintained by the air blowing mechanism for a predetermined time. As shown in the fourth stage (A4) in FIG. 5, it is possible to gain time for returning to a flat shape due to the characteristics of the paper itself, and it is possible to discharge the paper that has returned to a flat shape in a natural state to a paper receiving tray. As a result, the sheets can be neatly stacked on the paper tray.

また、中間スタック装置で保持している間、送風機構により空気を吹き付けるので、用紙のインクを速やかに乾燥させることができ、これにより、積載時の印刷用紙の裏写りを防止することができる。   Further, since the air is blown by the air blowing mechanism while being held by the intermediate stack device, the ink on the paper can be quickly dried, thereby preventing the show-through of the printing paper when stacked.

また、中間スタック上に用紙を、効率良く、かつ、確実に平面状に維持し、乾燥させることができる。特に、用紙のカール現象は、四隅部分から生じ始めるので、用紙の四隅部分に集中的に空気を吹き付けることにより、用紙全体に空気を吹き付ける場合に比べ、送風機構を小形化できるにも拘わらず、効率良く、用紙を平面状に維持することができる。ちなみに、中央部の乾燥が不十分であっても、四隅部分に空気を集中的に吹き付けることにより、十分に用紙を平面状に維持することができる。 Further, it is possible to efficiently and surely maintain the sheet on the intermediate stack and to dry it. In particular, the paper curl phenomenon starts to occur at the four corners, so that by blowing air intensively on the four corners of the paper, the air blowing mechanism can be downsized compared to the case of blowing air over the entire paper, The paper can be maintained in a flat shape efficiently. Incidentally, even if the central portion is not sufficiently dried, the paper can be sufficiently maintained flat by blowing air intensively to the four corner portions.

請求項2記載の発明は、方法の発明であって、紙受け台31の上方位置に中間スタック装置40を備え、該中間スタック装置40の上方位置に送風機構50を備え、前記中間スタック装置40は、用紙幅方向に間隔をおいて立設された1対の支持脚42と、両支持脚42に回動軸45を介して回動自在に支持された1対の保持板41と、両保持板41を、略水平な保持位置と下方に垂下する放出位置との間で駆動する駆動アクチュエータ46と、を有している紙受け装置の排紙方法において、画像形成部で画像形成された用紙を、前記中間スタック装置40は、保持位置の1対の前記保持板41により、一時的に保持し、一方、前記送風機構50は、前記保持状態の用紙の四隅部分S1に、それぞれ上方から空気を送風し、所定時間経過後、前記1対の保持板41を駆動アクチュエータ46により放出位置まで開き、垂下状態の保持板41及び1対の支持脚42により、用紙の端縁をガイドしつつ、用紙を、前記紙受け台31上に放出する。 The invention according to claim 2 is a method invention, comprising an intermediate stack device 40 at a position above the paper cradle 31 and a blower mechanism 50 above the intermediate stack device 40, wherein the intermediate stack device 40 is provided. Includes a pair of support legs 42 erected at intervals in the paper width direction, a pair of holding plates 41 rotatably supported on both support legs 42 via a rotation shaft 45, In a paper discharge method of a paper receiving apparatus having a drive actuator 46 that drives a holding plate 41 between a substantially horizontal holding position and a discharge position that hangs downward, an image is formed by an image forming unit. The intermediate stack device 40 temporarily holds the sheet by the pair of holding plates 41 at the holding position, while the blower mechanism 50 is respectively placed on the four corner portions S1 of the held sheet from above. Air is blown, and after a predetermined time, The pair of holding plates 41 are opened to the discharge position by the drive actuator 46, and the paper is placed on the paper tray 31 while guiding the edges of the paper by the hanging holding plate 41 and the pair of support legs 42. To release.

上記構成によると、前記請求項1の場合と同様の効果が得られる。   According to the said structure, the effect similar to the case of the said Claim 1 is acquired.

[発明の実施の形態]
図1〜図4は本発明による紙受け装置を孔版印刷機に備えた例であり、これらの図面に基づいて本発明の第1の実施の形態を説明する。
[Embodiment of the Invention]
1 to 4 show an example in which a paper receiving apparatus according to the present invention is provided in a stencil printing machine, and a first embodiment of the present invention will be described based on these drawings.

(印刷機の全体の概要)
図1は本発明による紙受け装置を備えた孔版印刷機の側面略図であり、説明の都合上、用紙供給側(図面の左側)を「後方」と称し、用紙搬送側、すなわち用紙排出側(図面の右側)を「前方」と称して、以下説明する。図1において、印刷機本体1には、後端部に給紙装置2が設けられ、前端部に紙受け装置3が設けられ、上側に画像読取装置4が設けられている。
(Overview of printing press)
FIG. 1 is a schematic side view of a stencil printing machine equipped with a paper receiving apparatus according to the present invention. For convenience of explanation, the paper supply side (left side of the drawing) is referred to as “rear”, and the paper transport side, that is, the paper discharge side ( The right side of the drawing will be referred to as “front” and will be described below. In FIG. 1, a printing machine main body 1 is provided with a paper feeding device 2 at the rear end, a paper receiving device 3 at the front end, and an image reading device 4 at the upper side.

印刷機本体1内には、前後方向の概ね中間部に、画像形成部として印刷ユニット5が設けられ、該印刷ユニット5の後上方には製版装置6が設けられ、印刷ユニット5の前上方には排版装置7が設けられ、印刷ユニット5と紙受け装置3との間には排紙装置8が設けられている。また、印刷ユニット5と給紙装置2との間には一対のタイミングローラ18が設けられている。   In the printing machine main body 1, a printing unit 5 is provided as an image forming unit at an approximately middle part in the front-rear direction. A plate-making device 6 is provided above the printing unit 5. A plate discharging device 7 is provided, and a paper discharge device 8 is provided between the printing unit 5 and the paper receiving device 3. A pair of timing rollers 18 is provided between the printing unit 5 and the paper feeding device 2.

印刷ユニット5は、インク供給ローラ10が内接すると共に矢印R方向に回転駆動する印刷用版胴11と、該印刷用版胴11に下方から当接自在に対向する上下方向移動可能な押圧ローラ12と、から構成され、印刷用版胴11と押圧ローラ12との間で印刷用紙Pの上面に印刷する。使用するインクとしては、主として、オイル成分が0又は略0の水性インクが使用されるが、従来のウォータインオイル型のインクの使用も可能である。   The printing unit 5 includes a printing plate cylinder 11 in which an ink supply roller 10 is inscribed and rotationally driven in the direction of an arrow R, and a vertically movable pressing roller 12 that faces the printing plate cylinder 11 so as to come into contact with the printing plate cylinder 11 from below. And printing is performed on the upper surface of the printing paper P between the printing plate cylinder 11 and the pressing roller 12. As the ink to be used, an aqueous ink having an oil component of 0 or substantially 0 is mainly used, but a conventional water-in oil type ink can also be used.

製版装置6は、マスターロール13と、該マスターロール13から供給される孔版原紙Nを製版するサーマルヘッド14及びプラテンローラ15等とを備えており、マスターロール13からの孔版原紙Nをサーマルヘッド14等で製版し、所定寸法に切断した後、印刷用版胴11の表面に供給する。   The plate making apparatus 6 includes a master roll 13, a thermal head 14 for making a stencil sheet N supplied from the master roll 13, a platen roller 15, and the like, and the stencil sheet N from the master roll 13 is transferred to the thermal head 14. The plate is made by the method described above, cut into predetermined dimensions, and then supplied to the surface of the printing plate cylinder 11.

排版装置7は、引込みローラ16及び巻取りローラ17等を備えており、印刷用版胴11に装着された使用済みの孔版原紙Nを取り外し、引込みローラ16で排版装置内部に引き込み、排版ローラ17で巻き取る。   The plate discharging device 7 includes a drawing roller 16 and a take-up roller 17. The used stencil sheet N mounted on the printing plate cylinder 11 is removed and drawn into the plate discharging device by the drawing roller 16. Wind up with.

給紙装置2は、給紙台23を備えると共に、該給紙台23の前端部に、給紙ローラ19及び捌き板20を備えており、給紙台23上に積載されている印刷用紙Pを、上から一枚ずつタイミングローラ18に供給する。   The sheet feeding device 2 includes a sheet feeding table 23, and includes a sheet feeding roller 19 and a separating plate 20 at a front end portion of the sheet feeding table 23, and the printing sheets P stacked on the sheet feeding table 23. Are supplied to the timing roller 18 one by one from the top.

上下一対のタイミングローラ18、18は、印刷用版胴11の駆動と同期して適宜タイミングで回転し、印刷用紙Pを印刷ユニット5へ送り込む。   The pair of upper and lower timing rollers 18 and 18 are rotated at an appropriate timing in synchronization with the drive of the printing plate cylinder 11 and feed the printing paper P into the printing unit 5.

排紙装置8は、複数の排紙ベルト21と、吸引ボックス22と、吸引ファン23とを備えており、吸引ボックス22は吸引ファン23に接続され、また、排紙ベルト21の左右両側には、平板状のガイド板24が立設されている。吸引ボックス22の空気吸引作用により、排紙ベルト21上の用紙Pを排紙ベルト21に吸着し、紙受け装置3へ排出するようになっている。   The paper discharge device 8 includes a plurality of paper discharge belts 21, a suction box 22, and a suction fan 23, and the suction box 22 is connected to the suction fan 23. A flat guide plate 24 is erected. Due to the air suction action of the suction box 22, the paper P on the paper discharge belt 21 is attracted to the paper discharge belt 21 and discharged to the paper receiving device 3.

(紙受け装置3の詳細な構造)
図1において、紙受け装置3は、印刷機本体1の前端面1aに略水平状態又は前下がり傾斜状態で支持された紙受け台31と、該紙受け台31の上方位に配置された中間スタック装置40と、該中間スタック装置40の上方に配置された4個の送風機構50と、から構成されている。紙受け台31の上面には、前端部にストッパー板35が配設され、左右両側部にサイドガイド桿(又はガイド板)34が配設されている。
(Detailed structure of the paper receiving device 3)
In FIG. 1, the paper receiving device 3 includes a paper receiving base 31 supported on the front end surface 1 a of the printing press main body 1 in a substantially horizontal state or a front downward inclined state, and an intermediate disposed in the upper direction of the paper receiving base 31. The stacking device 40 includes four air blowing mechanisms 50 arranged above the intermediate stacking device 40. On the upper surface of the paper receiving tray 31, a stopper plate 35 is disposed at the front end portion, and side guide rods (or guide plates) 34 are disposed at the left and right side portions.

図3は図1の紙受け装置3のIII-III断面拡大図であり、中間スタック装置40は、左右方向に間隔をおいて配置された左右1対の保持板41を備えており、各保持板41は、用紙搬送方向Fと平行(略水平)に配置された回動軸45にそれぞれ固着され、該回動軸45は、紙受け台31の左右両端部に立設された支持脚42の軸受部43に回動自在に支持されると共に、駆動アクチュエータ(たとえばステッピングモータ)46に連結されている。該駆動アクチュエータ46によって回動軸45を回動することにより、前記各保持板41は、図3に示すように略水平な保持位置(閉位置)と、図4に示すように下方に垂下した放出位置(開位置)との間で回動するようになっている。   FIG. 3 is an enlarged sectional view taken along the line III-III of the paper receiving device 3 of FIG. 1, and the intermediate stacking device 40 includes a pair of left and right holding plates 41 arranged at intervals in the left and right directions. The plates 41 are respectively fixed to rotating shafts 45 arranged in parallel (substantially horizontal) to the paper transport direction F, and the rotating shafts 45 are support legs 42 erected on both left and right ends of the paper receiving base 31. The bearing unit 43 is rotatably supported and is connected to a drive actuator (for example, a stepping motor) 46. By rotating the rotating shaft 45 by the drive actuator 46, each holding plate 41 hangs down substantially horizontally as shown in FIG. 3 and in a downward position as shown in FIG. It rotates between the discharge position (open position).

図2は中間スタック装置40の平面図であり、各回動軸45の駆動アクチュエータ46は、制御部52に電気的に接続しており、該制御部52により、排紙装置8からの印刷用紙の排出速度に合わせて、所定時間の間隔で開閉するように制御される。一例として、中間スタック装置40上に用紙が排出された後、10秒から数十秒経過後に、一時的に保持板41が下方に開くように制御される。なお、図1に示すように、排紙装置8と中間スタック装置40との間に、印刷用紙Pの通過を検出する光センサー55を配置し、該光センサー55により印刷用紙Pの通過を検出し、検出後、所定時間経過に、保持板41を開くように制御することも可能である。   FIG. 2 is a plan view of the intermediate stacking device 40, and the drive actuator 46 of each rotating shaft 45 is electrically connected to the control unit 52, and the control unit 52 allows the printing paper from the paper discharge device 8 to be printed. It is controlled to open and close at predetermined time intervals in accordance with the discharge speed. As an example, after the sheet is discharged onto the intermediate stack device 40, the holding plate 41 is controlled to open downward temporarily after 10 seconds to several tens of seconds have elapsed. As shown in FIG. 1, an optical sensor 55 that detects the passage of the printing paper P is disposed between the paper discharge device 8 and the intermediate stacking device 40, and the passage of the printing paper P is detected by the optical sensor 55. It is also possible to control the holding plate 41 to open after a predetermined time has elapsed after detection.

前記4つの送風機構50は、保持板41上に保持され印刷用紙Pの四隅部分S1に上方から空気を吹き付けるように配置されている。 The four air blowing mechanisms 50 are arranged on the holding plate 41 so as to blow air from above to the four corner portions S1 of the printing paper P.

(作用)
孔版印刷機全体の作用は、既に個々の装置の説明箇所で説明しているので、ここでは、印刷用紙Pが、図1の印刷ユニット5から排紙装置8を経て紙受け台31に排出されるまでの作用を説明する。
(Function)
Since the operation of the entire stencil printing machine has already been described in the description of each device, the printing paper P is discharged from the printing unit 5 in FIG. The operation up to this point will be described.

(1)図1において、印刷ユニット5において印刷用紙Pの上面に画像が印刷され、印刷済みの印刷用紙Pは、排紙装置8の排紙ベルト21上に排出される。 (1) In FIG. 1, an image is printed on the upper surface of the printing paper P in the printing unit 5, and the printed printing paper P is discharged onto the paper discharge belt 21 of the paper discharge device 8.

(2)排紙装置8では、吸引ボックス22により印刷用紙Pを排紙ベルト21の上面に吸着しつつ、前方に搬送するので、印刷用紙Pを略平面状に維持した状態で搬送することができる。すなわち、インク及び用紙の特性によっては、印刷直後から用紙Pの左右両端部が反り返り始めるが、排紙ベルト21上では、吸引ボックス22の吸引作用により印刷用紙Pが排紙ベルト21の上面に吸着されているので、用紙の反り返りを防止しつつ、前方に搬送することができる。また、左右のガイド板24により、印刷用紙が左右にずれるのを防ぐこともできる。 (2) In the paper discharge device 8, the printing paper P is conveyed forward while being attracted to the upper surface of the paper discharge belt 21 by the suction box 22, so that the printing paper P can be conveyed in a substantially flat state. it can. That is, depending on the characteristics of the ink and the paper, the left and right ends of the paper P begin to warp immediately after printing, but on the paper discharge belt 21, the print paper P is attracted to the upper surface of the paper discharge belt 21 by the suction action of the suction box 22. Therefore, the sheet can be conveyed forward while preventing the sheet from curling. Further, the left and right guide plates 24 can prevent the printing paper from shifting to the left and right.

(3)次に、排紙ベルト21の前端部から中間スタック装置41の保持板41上に排出さされ、印刷用紙Pの前端がストッパー板35に当接し、図2に示す状態で、所定時間、保持板41上に保持される。保持板41上に保持されている間、印刷用紙Pの四隅部分S1には、上方から送風機構50からの空気が吹き付けられ、これにより、印刷用紙Pの四隅部分S1が下側に反り返るのを防ぎ、印刷用紙Pを確実に平面状に維持し、そして、速やかにインクを乾燥させる。 (3) Next, the paper is discharged from the front end portion of the paper discharge belt 21 onto the holding plate 41 of the intermediate stack device 41, and the front end of the printing paper P abuts against the stopper plate 35. In the state shown in FIG. And held on the holding plate 41. While being held on the holding plate 41, the air from the blower mechanism 50 is blown onto the four corner portions S1 of the printing paper P from above, whereby the four corner portions S1 of the printing paper P are warped downward. Prevent, keep the printing paper P flat, and quickly dry the ink.

(4)図3のように印刷用紙Pを保持した状態で所定時間(10秒〜数十秒)が経過すると、図4に示すように、両保持板41は下方に開き、紙受け台31の積載用紙Pの上端面に、印刷用紙Pを自然落下させる。なお、前記図1に示すように、排紙装置8と中間スタック装置40との間に光センサー55を配置している場合は、光センサー55により検出後、所定時間経過に、両保持板41が開く。 (4) When a predetermined time (10 seconds to several tens of seconds) elapses with the printing paper P being held as shown in FIG. 3, both holding plates 41 are opened downward as shown in FIG. The printing paper P is naturally dropped on the upper end surface of the stacked paper P. As shown in FIG. 1, when the optical sensor 55 is disposed between the paper discharge device 8 and the intermediate stack device 40, both holding plates 41 are detected after a predetermined time has elapsed after detection by the optical sensor 55. Opens.

上記のように、印刷用紙Pを保持板41上で、所定時間、平面状に維持し、乾燥させるので、前記図5の第4段(A4)で説明したように、印刷用紙自身の特性によって印刷用紙は平面状態に戻る。したがって、カール現象による不揃いな用紙積載を回避することができ、しかも、印刷用紙の裏写り現象も回避できる。特に、印刷用紙Pの四隅部分S1を集中的に乾燥させる構成では、印刷用紙の中央部の乾燥が不十分であっても、反り返り易い四隅部分を乾燥させるので、全面を乾燥させる場合と比較して、効率良く、短時間の乾燥で印刷用紙の平面状態を維持できる。   As described above, since the printing paper P is kept flat on the holding plate 41 for a predetermined time and dried, as described in the fourth stage (A4) of FIG. The printing paper returns to the flat state. Therefore, uneven paper stacking due to the curl phenomenon can be avoided, and the print paper show-through phenomenon can also be avoided. In particular, in the configuration in which the four corner portions S1 of the printing paper P are intensively dried, even if the central portion of the printing paper is insufficiently dried, the four corner portions that tend to warp are dried. Thus, the plane state of the printing paper can be maintained efficiently by drying in a short time.

[その他の実施の形態]
(1)前記実施の形態では、中間スタック装置40の駆動アクチュエータ46として、ステッピングモータのみを利用しているが、本発明における中間スタックの駆動機構は、ステッピングモータに限定されず、シリンダ装置やリンク機構等を利用することもできる。また、駆動モータ等とトリガー装置を組合せることもできる。たとえば、トリガー装置の掛け金により、保持板41を水平な保持状態に係止し、掛け金を外すことにより、保持板41を自重で下方に開き、その後、駆動モータにより、元の保持状態に戻すように構成することも可能である。
[Other embodiments]
(1) In the above embodiment, only the stepping motor is used as the drive actuator 46 of the intermediate stack device 40. However, the drive mechanism of the intermediate stack in the present invention is not limited to the stepping motor, and is a cylinder device or a link. A mechanism or the like can also be used. Also, a drive motor or the like and a trigger device can be combined. For example, the holding plate 41 is locked in the horizontal holding state by the latch of the trigger device, and the holding plate 41 is opened downward by its own weight by removing the latch, and then returned to the original holding state by the drive motor. It is also possible to configure.

(2)送風機構50から温度(70°〜80°)の高い空気を用紙に吹き付ける構造とすることも可能であり、この場合は、用紙のインクの乾燥がさらに促進される。 (2) It is possible to adopt a structure in which air having a high temperature (70 ° to 80 °) is blown from the blower mechanism 50 to the paper. In this case, drying of the ink on the paper is further promoted.

(3)本発明は、孔版印刷機の紙受け装置には限定されず、画像形成部として、印刷ドラム等からなる印刷ユニットの代わりに、インクジェットノズルヘッドを備えたインクジェット印刷機の紙受け装置や、複写機等にも適用可能である。 (3) The present invention is not limited to a paper receiving device of a stencil printing machine, and instead of a printing unit including a printing drum or the like as an image forming unit, a paper receiving device of an ink jet printing machine provided with an ink jet nozzle head, It can also be applied to copying machines and the like.

(5)図1等の排紙装置8による排紙速度は、用紙の大きさや印刷の種類等によって変更することも可能である。 (5) The paper discharge speed by the paper discharge device 8 shown in FIG. 1 can be changed according to the size of the paper, the type of printing, and the like.

本発明の第1の実施の形態による紙受け装置を備えた孔版印刷機の側面略図である。1 is a schematic side view of a stencil printing machine provided with a paper receiving apparatus according to a first embodiment of the present invention. 図1の紙受け装置の平面拡大図である。FIG. 2 is an enlarged plan view of the paper receiving device in FIG. 1. 図1の紙受け装置のIII-III断面拡大図である。FIG. 3 is an enlarged cross-sectional view taken along the line III-III of the paper receiving device of FIG. 1. 印刷用紙を放出した時の状態を示す図1の紙受け装置のIII-III断面拡大図である。FIG. 3 is an III-III cross-sectional enlarged view of the paper receiving device of FIG. 1 showing a state when printing paper is discharged. 印刷後の用紙のカール現象の過程を示す断面図である。It is sectional drawing which shows the process of the curl phenomenon of the paper after printing. 紙受け台上にカールされた用紙が積載された状態を示す断面図である。It is sectional drawing which shows the state with which the paper curled on the paper receiving stand was loaded.

符号の説明Explanation of symbols

1 印刷機本体
3 紙受け装置
5印刷ユニット(画像形成部の一例)
8 排紙装置
21 排紙ベルト
22 吸引ボックス
24 サイドガイド板
31 紙受け台
31 紙受け台
40 中間スタック装置
41 保持板
46 駆動モータ
50 送風機構
52 制御部
DESCRIPTION OF SYMBOLS 1 Printer main body 3 Paper receiving device 5 Printing unit (an example of an image formation part)
DESCRIPTION OF SYMBOLS 8 Paper discharge apparatus 21 Paper discharge belt 22 Suction box 24 Side guide plate 31 Paper receiving stand 31 Paper receiving stand 40 Intermediate stack apparatus 41 Holding plate 46 Drive motor 50 Blower mechanism 52 Control part

Claims (2)

画像形成部で画像形成された用紙を、紙受け台(31)上に積層状態で載置する紙受け装置において、
前記紙受け台(31)の上方位置に、前記画像形成部で画像形成された用紙を、一時的に保持し、所定時間経過後に紙受け台上に放出する中間スタック装置(40)を配置しており、
前記中間スタック装置(40)は、用紙幅方向に間隔をおいて立設された1対の支持脚(42)と、両支持脚(42)に回動軸(45)を介して回動自在に支持された1対の保持板(41)と、両保持板(41)を、略水平な保持位置と下方に垂下する放出位置との間で駆動する駆動アクチュエータ(46)と、を備えており、
さらに、該中間スタック装置(40)の上方に、該中間スタック装置上の用紙の四隅部分(S1)に対し、それぞれ上方から空気を吹き付ける送風機構(50)を配置していることを特徴とする紙受け装置。
In the paper receiving apparatus for placing the paper on which the image is formed in the image forming unit on the paper receiving tray (31) in a stacked state,
An intermediate stack device (40) is disposed above the paper cradle (31) to temporarily hold the paper on which the image has been formed by the image forming unit and discharge it onto the paper cradle after a predetermined time has elapsed. And
The intermediate stacking device (40) has a pair of support legs (42) erected at intervals in the paper width direction, and both support legs (42) are rotatable via a rotation shaft (45). A pair of holding plates (41) supported by each other, and a drive actuator (46) for driving both holding plates (41) between a substantially horizontal holding position and a release position depending downward. And
Furthermore, a blowing mechanism (50) for blowing air from above each of the four corner portions (S1) of the paper on the intermediate stack device is arranged above the intermediate stack device (40). Paper receiving device.
紙受け台(31)の上方位置に中間スタック装置(40)を備え、該中間スタック装置(40)の上方位置に送風機構(50)を備え、前記中間スタック装置(40)は、用紙幅方向に間隔をおいて立設された1対の支持脚(42)と、両支持脚(42)に回動軸(45)を介して回動自在に支持された1対の保持板(41)と、両保持板(41)を、略水平な保持位置と下方に垂下する放出位置との間で駆動する駆動アクチュエータ(46)と、を有している紙受け装置の排紙方法において、
画像形成部で画像形成された用紙を、前記中間スタック装置(40)は、保持位置の1対の前記保持板(41)により、一時的に保持し、一方、前記送風機構(50)は、前記保持状態の用紙の四隅部分(S1)に、それぞれ上方から空気を送風し、
所定時間経過後、前記1対の保持板(41)を駆動アクチュエータ(46)により放出位置まで開き、垂下状態の保持板(41)及び1対の支持脚(42)により、用紙の端縁をガイドしつつ、用紙を、前記紙受け台(31)上に放出する紙受け装置の排紙方法。
An intermediate stack device (40) is provided at an upper position of the paper tray (31), and an air blowing mechanism (50) is provided at an upper position of the intermediate stack device (40). A pair of support legs (42) erected at an interval from each other, and a pair of holding plates (41) supported rotatably on both support legs (42) via a rotation shaft (45) And a drive actuator (46) for driving both holding plates (41) between a substantially horizontal holding position and a discharge position depending downward, in a paper discharge method for a paper receiving apparatus,
The intermediate stack device (40) temporarily holds the paper on which the image is formed by the image forming unit by the pair of holding plates (41) at the holding position, while the blower mechanism (50) the four corners of the sheet of the holding state (S1), and blowing air from above each
After a predetermined time has elapsed, the pair of holding plates (41) are opened to the discharge position by the drive actuator (46), and the edge of the sheet is moved by the hanging holding plates (41) and the pair of support legs (42). A paper discharge method of a paper receiving device that discharges paper onto the paper receiving tray (31) while guiding.
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JP5448931B2 (en) 2009-04-01 2014-03-19 キヤノン株式会社 Image forming apparatus
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