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EP0086153A1 - Apparatus for folding plates - Google Patents

Apparatus for folding plates Download PDF

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Publication number
EP0086153A1
EP0086153A1 EP83400236A EP83400236A EP0086153A1 EP 0086153 A1 EP0086153 A1 EP 0086153A1 EP 83400236 A EP83400236 A EP 83400236A EP 83400236 A EP83400236 A EP 83400236A EP 0086153 A1 EP0086153 A1 EP 0086153A1
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EP
European Patent Office
Prior art keywords
folding
machine according
belts
folding machine
holes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83400236A
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German (de)
French (fr)
Other versions
EP0086153B1 (en
EP0086153B2 (en
Inventor
Bernard Capdeboscq
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Martin SA
Original Assignee
Martin SA
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Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/22—Longitudinal folders, i.e. for folding moving sheet material parallel to the direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26—Folding sheets, blanks or webs
    • B31B50/36—Folding sheets, blanks or webs by continuously feeding the sheets, blanks or webs to stationary members, e.g. plates, ploughs or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2100/00—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2100/00—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs
    • B31B2100/002—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed
    • B31B2100/0022—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed made from tubular webs or blanks, including by tube or bottom forming operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2120/00—Construction of rigid or semi-rigid containers
    • B31B2120/30—Construction of rigid or semi-rigid containers collapsible; temporarily collapsed during manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26—Folding sheets, blanks or webs
    • B31B50/58—Folding sheets, blanks or webs by moving endless belts or chains

Definitions

  • the present invention relates to a machine for folding plates, and more particularly, by way of example, to a machine intended for folding packaging cases of corrugated cardboard after their shaping and printing.
  • the extreme transverse panels of the blank are folded inwards and glued to each other.
  • the folding.- is generally done by moving the boxes along an endless conveyor (belts, chains, etc ...) holding the central part of the blank firmly between the two folding lines thereof , the extreme panels resting on inclined bars which force them to rise or lower depending on whether the folding takes place from above or from below.
  • the extreme panels are thus brought vertically, and they are then generally taken up by other bars which end the folding flat.
  • the present invention aims to provide a solution to the drawbacks of these known devices.
  • the folder according to the invention is essentially characterized in that it is equipped with means contributing to carrying out the folding operation during the cycle of the general movement of the machine.
  • said folder is provided with folding elements constituted by endless belts, or the like, advancing in the cycle of the machine, and furnished with pushing cleats, or the like, placed in correspondence with the panels to be folded.
  • the cardboard blanks are introduced into the machine in the form of plates 1 furnished with two longitudinal marks (2, 3) obtained previously by crushing, or "upsetting”", cardboard. These marks form hinges around which the flaps 5 will be folded . and 6.
  • the folding is carried out by longitudinal displacement of the blank 1 along the folder.
  • the blanks 1 are transported through the folder using a conveyor comprising two endless belts (10, 11) pierced with holes 4 regularly distributed in the longitudinal direction, as can be seen clearly in FIG. 2.
  • the spacing between these holes 4 is adjusted so as to allow their engagement in the corresponding end pulleys upstream (12, 13) and downstream (14, 15), each of said pulleys being consequently provided with fingers 15 regularly distributed.
  • Each finger 15 has a pointed shape, although having an upper flat 17, and has lateral profiles 16 substantially in the form of involute portions of a circle, as can be seen in FIG. 2.
  • the upstream pulleys 12 and 13 are mounted idly, while the downstream pulleys 14 and 15 are integral with a shaft 18 driven in rotation by the general movement of the machine.
  • the driving pulleys 14 and 15 thus ensure an advance of the conveyor belts 10 and 11 in the machine cycle
  • the holes 4, in combination with the associated fingers 15, allow a permanent refocusing of said belts, permanently correcting their movement despite in particular their fluctuations in length, and thus guaranteeing their perfect cycling.
  • the holes 4 also serve as suction orifices making it possible to guarantee the plating of the central part 9 of the blanks 1 on the active parts of the conveyor belts 10 and 11, and therefore to guarantee their advance during the machine cycle, which is one of the essential aims of the invention.
  • Under each conveyor belt (10, 11) is therefore placed a suction box, respectively 19 and 20 connected to a vacuum pump by pipes 21 ( Figure 2).
  • the folding machine which has just been described has the advantage of guaranteeing the advancement of the plates during the machine cycle.
  • it uses conventional folding elements (7, 8) which have the disadvantage, with certain qualities of cardboard, of risking folding the flaps slightly crosswise.
  • the embodiments which will now be described use pusher cleats which move, by means of belts, chains, cables, or the like, during the cycle of the machine, that is to say at exactly the same theoretical speed as the plates to be folded, gradually pressing on the flaps to be folded.
  • pusher cleats which move, by means of belts, chains, cables, or the like, during the cycle of the machine, that is to say at exactly the same theoretical speed as the plates to be folded, gradually pressing on the flaps to be folded.
  • everything happens with this kind of device as if two slaves were folding the two flaps by pushing laterally on them while moving in the same direction as the boxes and at the same speed.
  • the folding bars 7 and 8 of FIG. 1 are, in this embodiment, replaced by a set of endless twisted belts 22, each turning at the cycle of the machine around end pulleys (23, 24) driven by the pulleys 12 of the conveyor 10 and carrying, at regular intervals corresponding to the spacing between two blanks on the conveyor 10, groups of pusher cleats 25.
  • the belts 22 are positioned so that their "go" or active strand is in alignment with the associated hinge 2, as indicated by the dotted extension, and the cleats 25 have a section such that it is the same for their bearing face 26.
  • the belts 22 are furnished with the same holes 4 as the conveyor belts 10 and 11 of FIG. 1, and the end pulleys 23 and 24 are likewise furnished with correction fingers 15 identical to those described above with reference to FIG. 2.
  • a set of small intermediate pulleys 27 also makes it possible to maintain the belt 22 on the desired twisted trajectory allowing the progressive folding of the flap 5 on the central part 9 of the blank.
  • each belt 22 is adjusted by acting on the relative positions of the pulleys 23, 24 and 27.
  • the belt 22 folds the flap 5 at an angle of approximately 90 degrees and, consequently, the end pulleys 24 and 23 have the positions shown in FIGS. 4 and 6 respectively.
  • the folding takes place gradually as it is clearly seen from the three successive phases shown diagrammatically in FIGS. 4 to 6.
  • the folder in Figure 3 has at least one pair of belts 22 upstream of that shown, responsible for performing the folding from 0 to about 90 degrees, as well as, if necessary, another couple downstream for finish folding 180 °.
  • the respective positions of the end pulleys are adjusted according to the desired folding, easily determined, as in the case of FIGS. 4 and 6, so that the upstream pulley ensures, with a cleat 25, the initial folding position, and that the downstream pulley ensures, with a cleat 25, the final folding position.
  • FIGS. 7 to 10 show an embodiment close to that of FIG. 3, but using non-twisted belts 221, therefore straight, furnished with pusher cleats 251 with rounded section, in this case semi-circular.
  • FIGS. 7, 8, 9 and 10 which correspond respectively to FIGS. 3, 4, 5 and 6 of the previous embodiment, the folding carried out by self-parallel displacement of the upstream return pulleys 241 and downstream 231.
  • the end pulleys (241, 231) have their vertical axes and located respectively beyond and below the folding axis 2, so on either side of it in the horizontal plane.

Landscapes

  • Making Paper Articles (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Abstract

Machine de pliage de plaques, plus particulièrement pour des caisses d'emballage en carton ondulé après leur façonnage et leur impression. Elle comporte des courroies d'avancement (10) et de pliage (22) maintenues au cycle exact de la machine grâce à des poulies (14) munies de doigts de recentrage (15). Les courroies convoyeuses sont munies d'éléments aspirants (19), et les courroies plieuses sont munies de taquets pousseurs (25) placés en correspondance avec les rabats (5) à plier.Plate folding machine, more particularly for corrugated cardboard packaging cases after their shaping and printing. It comprises advancement (10) and folding (22) belts maintained at the exact machine cycle by means of pulleys (14) provided with recentering fingers (15). The conveyor belts are provided with suction elements (19), and the folding belts are provided with pushing cleats (25) placed in correspondence with the flaps (5) to be folded.

Description

La présente invention se rapporte à une machine de pliage de plaques, et plus particulièrement, à titre d'exemple, à une machine destinée à plier des caisses d'emballage en carton ondulé après leur façonnage et leur impression.The present invention relates to a machine for folding plates, and more particularly, by way of example, to a machine intended for folding packaging cases of corrugated cardboard after their shaping and printing.

Le développement de l'utilisation des caisses d'emballage en carton ondulé exige des cadences de production très élevées. Les machines actuelles sont capables de produire des caisses à une très grande cadence, à partir d'une plaque en carton représentant le développement de la caisse à obtenir. Ces machines sont à l'heure actuelle des machines continues, où l'ébauche passe successivement d'un poste au suivant, sans stockage intermédiaire. La plaque est ainsi imprimée, découpée pour former les rabats ou les découpes auxiliaires, encollée sur sa patte de fermeture, puis pliée et collée jusqu'au poste final de mise en paquets pour livraison à l'utilisateur.The development of the use of corrugated cardboard packaging cases requires very high production rates. Current machines are capable of producing cases at a very high rate, from a cardboard plate representing the development of the case to be obtained. These machines are at present continuous machines, where the blank passes successively from one station to the next, without intermediate storage. The plate is thus printed, cut to form the flaps or the auxiliary cutouts, glued on its closing tab, then folded and glued to the final packing station for delivery to the user.

Dans la partie plieuse, les panneaux transversaux extrêmes de l'ébauche sont repliés vers l'intérieur et collés l'un à l'autre. Le pliage.-se fait généralement en faisant déplacer les caisses le long d'un convoyeur sans fin (à courroies, chaines, etc ...) maintenant fermement la partie centrale de l'ébauche entre les deux lignes de pliage de celle-ci, les panneaux extrêmes prenant appui sur des barres inclinées qui les forcent à se relever ou s'abaisser suivant que le pliage a lieu par dessus ou par dessous. On amène ainsi les panneaux extrêmes à la verticale, et ils sont ensuite en général repris par d'autres barres qui terminent le pliage à plat.In the folding part, the extreme transverse panels of the blank are folded inwards and glued to each other. The folding.-is generally done by moving the boxes along an endless conveyor (belts, chains, etc ...) holding the central part of the blank firmly between the two folding lines thereof , the extreme panels resting on inclined bars which force them to rise or lower depending on whether the folding takes place from above or from below. The extreme panels are thus brought vertically, and they are then generally taken up by other bars which end the folding flat.

Au lieu de barres inclinées, on peut utiliser d'autres dispositifs, tels que :

  • - des courroies mobiles droites ou vrillées ayant la même fonction
  • - des volets oscillants animés d'un mouvement cyclique et poussant les panneaux au rythme de leur passage jusqu'à obtenir leur pliage à plat
  • - des barres vrillées tournantes, telles que décrites dans le brevet US 4.254.692, qui ont la caractéristique de présenter un seul point de contact avec le panneau correspondant.
Instead of inclined bars, other devices can be used, such as:
  • - straight or twisted moving belts having the same function
  • - swinging flaps animated in a cyclic movement and pushing the panels to the rhythm of their passage until obtaining their folding flat
  • - Rotating twisted bars, as described in US Pat. No. 4,254,692, which have the characteristic of having a single point of contact with the corresponding panel.

Tous ces dispositifs connus présentent quelques inconvénients :

  • - l'utilisation de convoyeurs sans fin de type courant, combinée avec la légèreté des plaques, fait que les caisses à plier ne parcourent souvent pas la plieuse en synchronisme parfait avec le mouvement général de la machine. Ceci entraine des perturbations aussi bien dans le fonctionnement de la plieuse que dans celui de la machine située immédiatement en aval de celle-ci.
  • - ces dispositifs entrainent un mouvement relatif, dans le sens de la marche, entre les éléments de pliage et les caisses à plier. Ce mouvement relatif entraine un freinage de ces caisses. Ce freinage accentue encore les défauts de pliage au cycle des caisses
  • - la plupart de ces éléments de pliage agissent en appuyant sur la partie avant des panneaux latéraux, de sorte que le pliage se fait légèrement en travers, et que l'on obtient finalement des caisses mal pliées. On a déjà pensé, pour pallier ce dernier inconvénient, à utiliser, tel que décrit dans la demande de brevet allemande n° 2.911.969, des éléments mobiles de poussée auxiliaire entrainés par une chaine sans fin, mais ce genre de dispositif nécessite une mécanique très complexe et incapable de permettre l'obtention d'une rapidité d'avancement suffisante.
All of these known devices have some drawbacks:
  • - the use of standard type endless conveyors, combined with the lightness of the plates, means that the boxes to be folded often do not travel through the folder in perfect synchronism with the general movement of the machine. This causes disturbances both in the operation of the folder and in that of the machine located immediately downstream thereof.
  • - These devices cause a relative movement, in the direction of travel, between the folding elements and the boxes to be folded. This relative movement causes braking of these boxes. This braking further accentuates folding faults in the box cycle
  • - most of these folding elements act by pressing on the front part of the side panels, so that the folding is done slightly crosswise, and that badly folded boxes are finally obtained. We have already thought, to overcome this last drawback, to use, as described in German patent application No. 2,911,969, mobile auxiliary thrust elements driven by an endless chain, but this kind of device requires mechanical very complex and incapable of achieving sufficient speed of progress.

La présente invention a pour but d'apporter une solution aux inconvénients de ces dispositifs connus. La plieuse selon l'invention est essentiellement caractérisée en ce qu'elle est équipée de moyens contribuant à effectuer l'opération de pliage au cycle du mouvement général de la machine. Avantageusement par exemple, ladite plieuse est munie d'éléments de pliage constitués par des courroies sans fin, ou analogue, avançant au cycle de la machine, et garnies de taquets pousseurs, ou analogues, placés en correspondance avec les panneaux à plier.The present invention aims to provide a solution to the drawbacks of these known devices. The folder according to the invention is essentially characterized in that it is equipped with means contributing to carrying out the folding operation during the cycle of the general movement of the machine. Advantageously, for example, said folder is provided with folding elements constituted by endless belts, or the like, advancing in the cycle of the machine, and furnished with pushing cleats, or the like, placed in correspondence with the panels to be folded.

L'invention sera mieux comprise à l'aide de la description suivante de quelques exemples non limitatifs de réalisation, en référence aux dessins annexés dans lesquels :

  • - la figure 1 est une vue perspective schématique d'une plieuse selon l'invention
  • - la figure 2 est une coupe longitudinale d'une des extrémités du convoyeur équipant la plieuse de la figure 1
  • - la figure 3 est une vue schématique partielle d'une première variante de réalisation de la plieuse de la figure 1
  • - les figures 4, 5 et 6 sont des coupes schématiques montrant les phases successives du pliage d'une ébauche en carton avec la plieuse de la figure 3
  • - la figure 7 représente, de façon très schématique et partielle, une seconde variante de réalisation de la plieuse de la figure 1
  • - les figures 8, 9 et 10 sont, de même que précédemment, des coupes schématiques montrant les phases successives du pliage d'une ébauche avec la plieuse de la figure 7.
The invention will be better understood with the aid of the following description of some nonlimiting exemplary embodiments, with reference to the appended drawings in which:
  • - Figure 1 is a schematic perspective view of a folder according to the invention
  • - Figure 2 is a longitudinal section of one end of the conveyor fitted to the folder of Figure 1
  • - Figure 3 is a partial schematic view of a first alternative embodiment of the folder of Figure 1
  • - Figures 4, 5 and 6 are schematic sections showing the successive phases of the folding of a cardboard blank with the folder of Figure 3
  • - Figure 7 shows, very schematically and partially, a second alternative embodiment of the folder of Figure 1
  • - Figures 8, 9 and 10 are, as previously, schematic sections showing the successive phases of the folding of a blank with the pile Figure 7.

En se reportant tout d'abord à la vue d'ensemble de la figure 1, les ébauches de carton sont introduites dans la machine sous forme de plaques 1 garnies de deux marques longitudinales (2, 3) obtenues précédemment par écrasement, ou "refoulage", du carton. Ces marques forment des charnières autour desquelles seront pliés les rabats 5.et 6.Referring first to the overview of Figure 1, the cardboard blanks are introduced into the machine in the form of plates 1 furnished with two longitudinal marks (2, 3) obtained previously by crushing, or "upsetting"", cardboard. These marks form hinges around which the flaps 5 will be folded . and 6.

Le pliage est réalisé par déplacement longitudinal du flan 1 le long de la plieuse. La rencontre des rabats (5, 6) avec des éléments de pliage, constitués ici par deux barres vrillées (7, 8) classiques, entraine la rotation de ces rabats, autour des charnières correspondantes (2, 3), respectivement de 180 degrés à droite et à gauche, jusqu'à ce que les rabats soient en superposition avec la partie centrale 9 du flan 1, toute cette première partie du dispositif étant extrêmement classique.The folding is carried out by longitudinal displacement of the blank 1 along the folder. The meeting of the flaps (5, 6) with folding elements, constituted here by two conventional twisted bars (7, 8), causes the rotation of these flaps, around the corresponding hinges (2, 3), respectively 180 degrees to right and left, until the flaps are in superposition with the central part 9 of the blank 1, this whole first part of the device being extremely conventional.

Conformément maintenant à l'invention, les flans 1 sont transportés au travers de la plieuse à l'aide d'un convoyeur comportant deux courroies sans fin (10, 11) percées de trous 4 régulièrement répartis dans le sens longitudinal, comme on le voit nettement sur la figure 2. L'entraxe entre ces trous 4 est réglé de manière à permettre leur engrènement dans les poulies d'extrémité correspondante amont (12, 13) et aval (14, 15), chacune desdites poulies étant en conséquence munie de doigts 15 régulièrement répartis.Now in accordance with the invention, the blanks 1 are transported through the folder using a conveyor comprising two endless belts (10, 11) pierced with holes 4 regularly distributed in the longitudinal direction, as can be seen clearly in FIG. 2. The spacing between these holes 4 is adjusted so as to allow their engagement in the corresponding end pulleys upstream (12, 13) and downstream (14, 15), each of said pulleys being consequently provided with fingers 15 regularly distributed.

Chaque doigt 15 a une forme pointue, bien que présentant un méplat supérieur 17, et a des profils latéraux 16 substantiellement en forme de portions de développante de cercle, comme on le voit sur la figure 2.Each finger 15 has a pointed shape, although having an upper flat 17, and has lateral profiles 16 substantially in the form of involute portions of a circle, as can be seen in FIG. 2.

Les poulies amont 12 et 13 sont montées folles, tandis que les poulies aval 14 et 15 sont solidaires d'un arbre 18 entrainé en rotation par le mouvement général de la machine. Les poulies motrices 14 et 15 assurent ainsi une avancée des courroies convoyeuses 10 et 11 au cycle de la machine, tandis que les trous 4, en combinaison avec les doigts associés 15, permettent un recentrage permanent desditEs courroies, corrigeant en permanence leur mouvement en dépit en particulier de leur fluctuations de longueur, et garantissant ainsi leur parfaite mise au cycle. Par ailleurs, les trous 4 servent également d'orifices d'aspiration permettant de garantir le plaquage de la partie centrale 9 des flans 1 sur les parties actives des courroies convoyeuses 10 et 11, et donc de garantir leur avancée au cycle de la machine, ce qui est un des buts essentiels de l'invention. Sous chaque courroie convoyeuse (10, 11) est donc placé un caisson aspirant, respectivement 19 et 20 relié à une pompe à vide par des canalisations 21 (figure 2).The upstream pulleys 12 and 13 are mounted idly, while the downstream pulleys 14 and 15 are integral with a shaft 18 driven in rotation by the general movement of the machine. The driving pulleys 14 and 15 thus ensure an advance of the conveyor belts 10 and 11 in the machine cycle, while the holes 4, in combination with the associated fingers 15, allow a permanent refocusing of said belts, permanently correcting their movement despite in particular their fluctuations in length, and thus guaranteeing their perfect cycling. Furthermore, the holes 4 also serve as suction orifices making it possible to guarantee the plating of the central part 9 of the blanks 1 on the active parts of the conveyor belts 10 and 11, and therefore to guarantee their advance during the machine cycle, which is one of the essential aims of the invention. Under each conveyor belt (10, 11) is therefore placed a suction box, respectively 19 and 20 connected to a vacuum pump by pipes 21 (Figure 2).

La plieuse qui vient d'être décrite présente l'avantage de garantir l'avancée des plaques au cycle de la machine. Elle utilise cependant des éléments de pliage (7, 8) classiques qui présentent l'inconvénient, avec certaines qualités de carton, de risquer d'entraîner un pliage des rabats légèrement en travers. On décrira maintenant deux exemples de réalisation conformes à l'invention utilisant des éléments de pliage nouveaux, plus chers certes, mais n'entrainant pas cet inconvénient.The folding machine which has just been described has the advantage of guaranteeing the advancement of the plates during the machine cycle. However, it uses conventional folding elements (7, 8) which have the disadvantage, with certain qualities of cardboard, of risking folding the flaps slightly crosswise. We will now describe two embodiments in accordance with the invention using new folding elements, more expensive certainly, but not causing this drawback.

D'une manière générale, les formes de réalisation qui vont maintenant être décrites utilisent des taquets pousseurs qui se déplacent, à l'aide de courroies, chaines, câbles, ou analogue, au cycle de la machine, c'est-à-dire exactement à la même vitesse théorique que les plaques à plier, en appuyant progressivement sur les rabats à plier. De cette façon, on peut obtenir, en mettant plusieurs dispositifs bout à bout, un pliage des rabats de 0 à 180 degrés. On peut régler l'emplacement des points d'appui des taquets sur chaque rabat de façon à ce que l'appui ne se fasse pas sur leur partie antérieure, comme c'est le cas par exemple avec les barres de pliage de l'art antérieur. Tout se passe en somme, avec ce genre de dispositif, comme si deux esclaves effectuaient le pliage des deux rabats en poussant latéralement sur ceux-ci tout en se déplaçant dans le même sens que les caisses et à la même vitesse. On pourrait parvenir à un tel résultat à l'aide de volets oscillants qui seraient portés par un convoyeur auxiliaire se déplaçant à la vitesse du convoyeur de support des plaques, mais un tel dispositif serait d'une complexité de réalisation très supérieure à celle des dispositifs à taquets pousseurs concernés par l'invention.In general, the embodiments which will now be described use pusher cleats which move, by means of belts, chains, cables, or the like, during the cycle of the machine, that is to say at exactly the same theoretical speed as the plates to be folded, gradually pressing on the flaps to be folded. In this way, it is possible, by putting several devices end to end, to fold the flaps from 0 to 180 degrees. You can adjust the location of the support points of the cleats on each flap so that the support does not take place on their front part, as is the case for example with the folding bars of art prior. In short, everything happens with this kind of device, as if two slaves were folding the two flaps by pushing laterally on them while moving in the same direction as the boxes and at the same speed. One could achieve such a result using oscillating flaps which would be carried by an auxiliary conveyor moving at the speed of the plate support conveyor, but such a device would be of a complexity of realization much higher than that of the devices. with pusher cleats concerned by the invention.

En se reportant maintenant à l'ensemble des figures 3 à 6, les barres de pliage 7 et 8 de la figure 1 sont, dans cette forme de réalisation, remplacées par un ensemble de courroies sans fin vrillées 22, tournant chacune au cycle de la machine autour de poulies d'extrémité (23, 24) entrainées par les poulies 12 du convoyeur 10 et portant, à des intervalles réguliers correspondant à l'espacement entre deux ébauches sur le convoyeur 10, des groupes de taquets pousseurs 25.Referring now to all of FIGS. 3 to 6, the folding bars 7 and 8 of FIG. 1 are, in this embodiment, replaced by a set of endless twisted belts 22, each turning at the cycle of the machine around end pulleys (23, 24) driven by the pulleys 12 of the conveyor 10 and carrying, at regular intervals corresponding to the spacing between two blanks on the conveyor 10, groups of pusher cleats 25.

Comme on le voit sur les vues en coupe des figures 4 à 6, les courroies 22 sont positionnées de manière telle que leur brin "aller", ou actif, soit en alignement avec la charnière 2 associée, comme indiqué par le prolongement en pointillés, et les taquets 25 ont une section telle qu'il en soit de même pour leur face portante 26. Les courroies 22 sont garnies des mêmes trous 4 que les courroies transporteuses 10 et 11 de la figure 1, et les poulies d'extrémité 23 et 24 sont de même garnies de doigts de correction 15 identiques à ceux décrits précédemment en référence à la figure 2. Un ensemble de petites poulies intermédiaires 27 permet par ailleurs de maintenir la courroie 22 sur la trajectoire vrillée voulue permettant le pliage progressif du rabat 5 sur la partie centrale 9 du flan.As can be seen in the sectional views of FIGS. 4 to 6, the belts 22 are positioned so that their "go" or active strand is in alignment with the associated hinge 2, as indicated by the dotted extension, and the cleats 25 have a section such that it is the same for their bearing face 26. The belts 22 are furnished with the same holes 4 as the conveyor belts 10 and 11 of FIG. 1, and the end pulleys 23 and 24 are likewise furnished with correction fingers 15 identical to those described above with reference to FIG. 2. A set of small intermediate pulleys 27 also makes it possible to maintain the belt 22 on the desired twisted trajectory allowing the progressive folding of the flap 5 on the central part 9 of the blank.

Le pliage effectué par chaque courroie 22 est réglé en agissant sur les positions relatives des poulies 23, 24 et 27. Dans l'exemple considéré, la courroie 22 plie le rabat 5 sur un angle d'environ 90 degrés et, en conséquence, les poulies d'extrémité 24 et 23 ont les positions représentées respectivement sur les figures 4 et 6. Le pliage s'effectue progressivement comme il apparaît clairement des trois phases successives schématisées sur les figures 4 à 6.The folding performed by each belt 22 is adjusted by acting on the relative positions of the pulleys 23, 24 and 27. In the example considered, the belt 22 folds the flap 5 at an angle of approximately 90 degrees and, consequently, the end pulleys 24 and 23 have the positions shown in FIGS. 4 and 6 respectively. The folding takes place gradually as it is clearly seen from the three successive phases shown diagrammatically in FIGS. 4 to 6.

Il va de soi que la plieuse de la figure 3 comporte au moins un couple de courroies 22 en amont de celle représentée, chargé d'effectuer le pliage de 0 à environ 90 degrés, ainsi que, si nécessaire, un autre couple en aval pour terminer le pliage à 180°. Les positions respectives des poulies d'extrémité sont réglées en fonction du pliage souhaité, facilement déterminées, comme dans le cas des figures 4 et 6, de façon que la poulie amont assure, avec un taquet 25, la position de pliage initial, et que la poulie aval assure, avec un taquet 25, la position de pliage final.It goes without saying that the folder in Figure 3 has at least one pair of belts 22 upstream of that shown, responsible for performing the folding from 0 to about 90 degrees, as well as, if necessary, another couple downstream for finish folding 180 °. The respective positions of the end pulleys are adjusted according to the desired folding, easily determined, as in the case of FIGS. 4 and 6, so that the upstream pulley ensures, with a cleat 25, the initial folding position, and that the downstream pulley ensures, with a cleat 25, the final folding position.

En variante simplifiée, on pourrait très bien n'installer qu'un seul couple de courroies 22 pour assurer le pliage selon les figures 4, à 6, et prévoir pour le reste du pliage des éléments classiques, tels que des barres de pliage.In a simplified variant, it would very well be possible to install only one pair of belts 22 to ensure folding according to FIGS. 4, to 6, and to provide for the rest of the folding of the conventional elements, such as folding bars.

Les figures 7 à 10 montrent une.forme de réalisation proche de celle de la figure 3, mais utilisant des courroies 221 non vrillées, donc droites, garnies de taquets pousseurs 251 à section arrondie, en l'occurence se- mi-circulaire. Dans le cas représenté sur les figures 7, 8, 9 et 10 (qui correspondent respectivement aux figures 3, 4, 5 et 6 de la réalisation précédente), on règle le pliage effectué par déplacement auto-parallèle des poulies de renvoi amont 241 et aval 231.FIGS. 7 to 10 show an embodiment close to that of FIG. 3, but using non-twisted belts 221, therefore straight, furnished with pusher cleats 251 with rounded section, in this case semi-circular. In the case shown in FIGS. 7, 8, 9 and 10 (which correspond respectively to FIGS. 3, 4, 5 and 6 of the previous embodiment), the folding carried out by self-parallel displacement of the upstream return pulleys 241 and downstream 231.

Dans l'exemple représenté, où le pliage est effectué de 90 à 180 degrés environ, les poulies d'extrémité (241, 231) ont leurs axes verticaux et situés respectivement au-delà et en-deçà de l'axe de pliage 2, donc de part et d'autre de celui-ci dans le plan horizontal. Pour effectuer le pliage de 0 à 90 degrés, on placera, avant l'ensemble (221, 231, 241) représenté, un ensemble identique mais à poulies d'extrémité à axes horizontaux, situés de part et d'autre de l'axe de pliage 2 dans le plan vertical.In the example shown, where the folding is carried out from 90 to 180 degrees approximately, the end pulleys (241, 231) have their vertical axes and located respectively beyond and below the folding axis 2, so on either side of it in the horizontal plane. To fold from 0 to 90 degrees, before the assembly (221, 231, 241) shown, place an identical assembly but with end pulleys with horizontal axes, located on either side of the axis folding 2 in the vertical plane.

L'invention n'est évidemment pas limitée aux exemples que l'on vient de décrire. D'autres formes de taquets pousseurs portés par d'autres formes de courroies, câbles, ou chaines pourraient très bien être utilisées. Par exemple, on pourrait très bien utiliser des taquets pousseurs constitués par des disques tournants sur eux-mêmes et portés par une corde à billesThe invention is obviously not limited to the examples which just described. Other forms of pusher cleats carried by other forms of belts, cables, or chains could very well be used. For example, one could very well use pusher cleats constituted by discs rotating on themselves and carried by a ball cord

Claims (9)

1.- Machine de pliage de plaques, caractérisée en ce qu'elle est équipée de moyens contribuant à effectuer l'opération de pliage au cycle du mouvement général de la machine.1.- Plate folding machine, characterized in that it is equipped with means contributing to carrying out the folding operation in the cycle of the general movement of the machine. 2.- Machine de pliage selon la revendication 1, caractérisée en ce qu'elle est munie d'un convoyeur des plaques à plier comportant au moins une courroie (10, 11) percée de trous (4) régulièrement répartis dans le sens longitudinal, l'entraxe entre ces trous permettant leur engrènement dans au moins une poulie (14) munie en conséquence de doigts d'engrènement (15) à profils latéraux (16) substantiellement en forme de portions de développante de cercle.2. A folding machine according to claim 1, characterized in that it is provided with a conveyor for folding plates comprising at least one belt (10, 11) pierced with holes (4) regularly distributed in the longitudinal direction, the spacing between these holes allowing their engagement in at least one pulley (14) provided consequently with engagement fingers (15) with lateral profiles (16) substantially in the form of involutes of a circle. 3.- Machine de pliage selon la revendication 2, caractérisée en ce qu'elle comporte en outre un dispositif (19, 21) d'aspiration par les trous (4) de ladite courroie permettant de plaquer lesdits plaques sur ladite courroie convoyeuse.3. A folding machine according to claim 2, characterized in that it further comprises a device (19, 21) for suction by the holes (4) of said belt for pressing said plates on said conveyor belt. 4.- Machine de pliage selon l'une quelconque des revendications 1 à 3, caractérisée en ce qu'elle est munie d'éléments de pliage dont au moins une partie est constituée par des courroies (22, 221) sans fin, ou analogue, avançant au cycle de la machine, et garnies de taquets pousseurs (25, 251), ou analogues, placés en correspondance avec les panneaux (5) à plier.4.- folding machine according to any one of claims 1 to 3, characterized in that it is provided with folding elements at least part of which is constituted by endless belts (22, 221), or the like , advancing in the cycle of the machine, and furnished with pushing cleats (25, 251), or the like, placed in correspondence with the panels (5) to be folded. 5.- Machine de pliage selon la revendication 4, caractérisée en ce que lesdites courroies sont percées de trous (4) régulièrement répartis dans le sens longitudinal, l'entraxe entre ces trous permettant leur engrènement dans au moins une poulie (23, 24, 231, 241) munie en conséquence de doigts d'engrènement (15) à profils latéraux (16, figure 2) substantiellement en forme de portions de développante de cercle.5. A folding machine according to claim 4, characterized in that said belts are pierced with holes (4) regularly distributed in the longitudinal direction, the distance between these holes allowing their engagement in at least one pulley (23, 24, 231, 241) consequently provided with meshing fingers (15) with lateral profiles (16, FIG. 2) substantially in the form of involutes of a circle. 6.- Machine de pliage selon la revendication 4 ou la revendication 5, caractérisée en ce que lesdites courroies (22) sont vrillées et positionnées de façon à ce que leur brin actif (22) soit toujours en alignement avec la charnière de pliage correspondante (2).6. A folding machine according to claim 4 or claim 5, characterized in that said belts (22) are twisted and positioned so that their active strand (22) is always in alignment with the corresponding folding hinge ( 2). 7.- Machine de pliage selon la revendication 6, caractérisée en ce qu'elle est munie de taquets pousseurs (25) dont la face portante (26) est également en alignement avec ladite charnière de pliage (2).7. A folding machine according to claim 6, characterized in that it is provided with pusher cleats (25) whose bearing face (26) is also in alignment with said folding hinge (2). 8.- Machine de pliage selon la revendication 4 ou la revendication 5, caractérisée en ce que lesdites courroies (221) sont droites et sont munies de taquets pousseurs (251) de forme arrondie.8. A folding machine according to claim 4 or claim 5, characterized in that said belts (221) are straight and are provided with pusher cleats (251) of rounded shape. 9.- Machine de pliage selon la revendication 8, caractérisée en ce que lesdits taquets pousseurs (251) ont une section semi-circulaire (figure 8).9. A folding machine according to claim 8, characterized in that said pusher cleats (251) have a semi-circular section (Figure 8).
EP83400236A 1982-02-04 1983-02-04 Apparatus for folding plates Expired - Lifetime EP0086153B2 (en)

Applications Claiming Priority (2)

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FR8201782A FR2520665B1 (en) 1982-02-04 1982-02-04 PLAQUE FOLDING MACHINE
FR8201782 1982-02-04

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EP0086153A1 true EP0086153A1 (en) 1983-08-17
EP0086153B1 EP0086153B1 (en) 1986-06-18
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EP (1) EP0086153B2 (en)
JP (1) JPS58147346A (en)
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FR93649E (en) * 1966-11-04 1969-04-25 Alain Pierre Folder especially for paper.
US3797371A (en) * 1971-12-29 1974-03-19 Int Paper Co Method and apparatus for folding a carton blank
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GB2060478A (en) * 1979-10-19 1981-05-07 Ward Machinery Co Box blank folding apparatus

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FR1189202A (en) * 1956-10-01 1959-10-01 Machine used to supply a liner in the manufacture of flattened, lined packaging
FR93649E (en) * 1966-11-04 1969-04-25 Alain Pierre Folder especially for paper.
US3797371A (en) * 1971-12-29 1974-03-19 Int Paper Co Method and apparatus for folding a carton blank
US3805683A (en) * 1972-08-28 1974-04-23 C Hook Timed vacuum delivery belts
FR2260447A1 (en) * 1974-02-13 1975-09-05 Universal Corrugated Box Mach
DE2911969A1 (en) * 1979-03-27 1980-10-16 Bahmueller Masch W Folding method for box cut=outs - uses element guided sideways to cut=out and moved forward synchronously swivelling inwards during forward movement and then lifted off
GB2060478A (en) * 1979-10-19 1981-05-07 Ward Machinery Co Box blank folding apparatus

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EP0388649A1 (en) * 1989-03-18 1990-09-26 Wilhelm Bahmüller Maschinenbau Präzisionswerkzeuge GmbH Folding machine
DE3908981A1 (en) * 1989-03-18 1990-09-27 Bahmueller Masch W FOLDING MACHINE
CN1994728B (en) * 2006-12-30 2011-04-13 杨景宽 Corrugated board fold positioning device

Also Published As

Publication number Publication date
FR2520665B1 (en) 1987-12-24
DE3364116D1 (en) 1986-07-24
EP0086153B1 (en) 1986-06-18
JPS6158296B2 (en) 1986-12-11
JPS58147346A (en) 1983-09-02
US4614512A (en) 1986-09-30
EP0086153B2 (en) 1990-10-03
FR2520665A1 (en) 1983-08-05

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