WO1994021546A1 - Device for straightening a sheet of material, for example cardboard, supplied continuously - Google Patents

Device for straightening a sheet of material, for example cardboard, supplied continuously Download PDF

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Publication number
WO1994021546A1
WO1994021546A1 PCT/FR1994/000327 FR9400327W WO9421546A1 WO 1994021546 A1 WO1994021546 A1 WO 1994021546A1 FR 9400327 W FR9400327 W FR 9400327W WO 9421546 A1 WO9421546 A1 WO 9421546A1
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WO
WIPO (PCT)
Prior art keywords
cylinders
bearings
ply
supports
return
Prior art date
Application number
PCT/FR1994/000327
Other languages
French (fr)
Inventor
Jean-Pierre Roux
Pierrick Daniel
Original Assignee
Komori-Chambon S.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Komori-Chambon S.A. filed Critical Komori-Chambon S.A.
Priority to JP6520736A priority Critical patent/JPH07507530A/en
Priority to EP94911214A priority patent/EP0642461B1/en
Priority to DE69405180T priority patent/DE69405180T2/en
Publication of WO1994021546A1 publication Critical patent/WO1994021546A1/en

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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
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/34—Apparatus for taking-out curl from webs

Definitions

  • the present invention relates to a device for
  • webs are used which are cut continuously from a reel and which are then cut, after having been previously printed or not.
  • Such is, for example, the case of a machine for manufacturing pieces or "blanks" of cardboard, intended to subsequently constitute boxes, these blanks being cut from a sheet of cardboard supplied from a reel. Since this cardboard sheet is wound on
  • the radius of curvature of the natural shape of the cut cardboard blanks varies according to the turn of the sheet considered, the radius of curvature being naturally much greater in the vicinity of the periphery of the reel than in the central part of that -this.
  • the devices known rectifier comprise a pair of return cylinders with parallel axes on which the web passes by forming a flat section contained in the plane tangent to the two return cylinders, and a rectifier block mounted movable between the two return cylinders, in a direction perpendicular to the plane of the web between these two cylinders.
  • This rectifier block comprises at least one pressure member extending transversely with respect to the ply and which can come to bear, by exerting pressure, on a face of the planar section of the ply, so as to repel it outside the plane tangent to the two return cylinders and thus create a V-shaped ply section between the two cylinders.
  • This action of the mobile rectifier block pressure member makes it possible to break the fibers of the cardboard somewhat and to counterbalance the natural curvature of the cardboard web, which makes it possible to obtain flat cardboard blanks later.
  • this device for straightening a sheet of material, for example cardboard, continuously scrolling, cut from a reel, comprising a frame comprising supports for the bearings of two return cylinders, with parallel axes , over which the ply passes by forming a flat section contained in a plane tangent to the two cylinders, and a rectifier block mounted movably between the two return cylinders, perpendicular to the ply section extending between these two cylinders, this rectifier block mobile comprising at least one transverse pressure member capable of coming to bear on one face of the ply to push it out of the plane tangent to the two cylinders and give it the shape of a V between these two cylinders, is characterized in that the bearing supports of the two return cylinders constitute guides for the bearings mounted movable on these supports and connecting means are provided between the bearing supports of the two return cylinders.
  • Figure 1 is a simplified schematic elevational view of a device for straightening a sheet fed from a coil, the movable rectifier block being shown in the inactive position in which it does not act on the sheet.
  • Figure 2 is a simplified schematic elevational view similar to that of Figure 1, the movable rectifier block being shown in an active position in which it causes a V-shaped deformation of the web.
  • Figure 3 is an elevational view of an alternative embodiment of the straightening device.
  • the straightening device according to the invention is intended to act on a web 2 continuously scrolling and which is delivered at from an upstream coil 3.
  • the sheet 2 can be a sheet of any material having a "shape memory", that is to say which tends to resume, when it is cut into pieces, downstream , its natural curved shape that it previously had within the reel 3.
  • shape memory that is to say which tends to resume, when it is cut into pieces, downstream , its natural curved shape that it previously had within the reel 3.
  • the axis of the coil 3 and the axes of all the cylinders 4,5,6,7 are horizontal and transverse with respect to the direction of travel of the sheet 2.
  • the rectifying device 1 according to the invention comprises a rectifier block 8 which is disposed between the two return cylinders 5 and 6.
  • This rectifier block 8 is mounted vertically movable on the frame, not shown, of the device 1, as indicated by the arrow f.
  • the rectifier block 8 can move perpendicular to the horizontal section 2a of the ply 2 which is located in the upper plane P tangent horizontally to the two return cylinders 5 and 6.
  • the rectifier block 8 comprises two pressure members s' extending transversely, namely an upper horizontal and transverse rod 9, situated above the section 2a of the ply, and a lower horizontal and transverse rod 1 1 situated below the section 2a.
  • the stems of pressure 9 and 11 are separated from each other by a small interval and they can act respectively on the ply section 2a, according to the direction of movement of the rectifier block 8.
  • the respective bearings 12 and 13 of the return cylinders 5 and 6 are movably mounted on suitable supports 14, 15 provided on the frame of the straightening device 1, these supports 14,15 being constituted by housings or cams which can be straight.
  • connection means are provided between the rectifier block 8 and the bearings 12, 13 of the return cylinders 5,6.
  • These connecting means may preferably be of the mechanical type and they may then be constituted, as shown in FIGS. 1 and 2, by connecting rods 16 and 17, both located below the horizontal section 2a of the ply and which are articulated, at one of their ends, on the rectifier block 8, around respective axes 18,19 and, at their other ends, on the bearings 12, 13 of the return cylinders 5,6.
  • the axes 18, 19 of articulation of the connecting rods 16, 17 are located at a level lower than that of the lower rod 11 and symmetrically with respect to the vertical and transverse plane PI containing the axes of the rods 9 and 11.
  • the axes of the cylinders 5,6 are separated by a distance d and the connecting rods 16, 17 can extend horizontally, as shown in FIG. 1, or they can be inclined relative to the horizontal, the angle of inclination depending on the geometry of the straightening device.
  • the housings or cams 14, 15 which constitute the guide supports for the movable bearings 12, 13 of the return cylinders 5, 6 can also be horizontal or even inclined relative to the horizontal, depending the geometry of the straightening device.
  • the straightening block 8 When the straightening device 1 is put into service, that is to say it is placed in an active position as shown in FIG. 2, the straightening block 8 is lowered so that its upper pressure rod 9 comes into contact with the upper face of the ply section 2a and then pushes this section down, giving the ply section 2a a V shape with a point directed downwards, as shown in the figure 2.
  • This action of the upper pressure rod 9 has the effect of breaking the fibers of the cardboard web and of compensating for the natural curvature of the cardboard blanks cut later which would tend to have a "bulge” or an upward convexity. , due to the "shape memory" of the cardboard constituting the ply wound in the form of the coil 3.
  • the supports 14, 15 constituting movable bearings
  • the rectifier block 8 would then be moved up, its lower rod 11 would raise the ply section 2a. in order to form a V-shaped section with an upward-pointing point, the axes 18, 19 of the connecting rods 16, 17 would be driven upwards, passing the connecting rods in positions inclined downwards 3 and in the direction return cylinders 5,6, and the bearings 12,13 would again be close together and slightly elevated on their supports 14, 15. The same effect would compensate for the variation in length of the ply 2. In the variant of execution shown in the figure
  • the upstream 5 and downstream 6 return cylinders are located respectively below and above the horizontal tangent plane P along which extends the horizontal section 2a of the ply 2.
  • the ply 2 passes under the cylinder of downstream return 6 and it is then deflected upwards, in the direction of the downstream debtor cylinder 7 which is located above the plane P.
  • the connecting rods 16 connected to the bearings 12 of the upstream return cylinder 5 are located under the horizontal section 2a of the ply 2, while the connecting rods 17 connected to the bearings 13 of the downstream return cylinder 6 are located above this horizontal section 2a.
  • the articulation axes 18, 19 of the connecting rods 16, 17 on the rectifier block 8 are symmetrical to one another with respect to the intersection of the horizontal plane P and the vertical plane PI.
  • the straightening device shown in Figure 3 is particularly interesting because it can allow 100% compensation for the variation in length of the ply 2 by playing on the profiles of the cams 14, 15 constituting the supports of the bearings 12, 1.
  • connecting means between the movable rectifier block 8 and the return cylinders 5,6 have been described as being constituted by connecting rods, it goes without saying that they could be produced in any other way, in particular by pneumatic means , hydraulic, electrical, etc., controlling the movement of the movable bearings 12, 13 of the return cylinders 5, 6 to the movement of the rectifier block 8.

Abstract

The present invention relates to a straightening device (1) for straightening a sheet of material (2), for example cardboard, supplied continuously from a reel (3). Said device is characterized in that the supports (14, 15) of the bearings (12, 13) of both return cylinders (5, 6) form guides for the bearings (12, 13) mounted movably on said supports, and linking means (16, 17) are provided between the movable straightening block (8) and the bearings (12, 13) of the return cylinders (5, 6) so as to reduce the distance (d) between the axes of the two return cylinders (5, 6) as a function of the amplitude of the V deformation of the sheet (2), and also to compensate automatically the variation of the length of said sheet.

Description

"DISPOSITIF DE REDRESSEMENT D'UNE NAPPE DE MATIERE, PAR EXEMPLE DE CARTON, DEFILANT EN "DEVICE FOR STRAIGHTENING A TABLE OF MATERIAL, FOR EXAMPLE CARDBOARD, RUNNING BY
CONTINU"CONTINUED"
La présente invention concerne un dispositif deThe present invention relates to a device for
5 redressement d'une nappe de matière, par exemple de carton, défilant en continu, débitée à partir d'une bobine.5 straightening a sheet of material, for example cardboard, continuously scrolling, cut from a spool.
Dans certains secteurs de l'industrie on utilise des nappes qui sont débitées en continu à partir d'une bobine et qui sont ensuite découpées, après avoir ou non été l u préalablement imprimées. Tel est, par exemple, le cas d'une machine de fabrication de morceaux ou "flans" de carton, destinés à constituer ultérieurement des boîtes, ces flans étant découpés dans une nappe de carton débitée à partir d'une bobine. Etant donné que cette nappe de carton est enroulée surIn certain sectors of the industry, webs are used which are cut continuously from a reel and which are then cut, after having been previously printed or not. Such is, for example, the case of a machine for manufacturing pieces or "blanks" of cardboard, intended to subsequently constitute boxes, these blanks being cut from a sheet of cardboard supplied from a reel. Since this cardboard sheet is wound on
15 elle-même dans la bobine qu'elle constitue, elle conserve ultérieurement une certaine "mémoire de forme" et de ce fait, lorsque l'on découpe, à partir de la nappe, des flans de carton, ceux-ci ont une certaine tendance à reprendre la forme naturelle courbe de la nappe, au sein de la bobine constituée15 itself in the reel which it constitutes, it subsequently retains a certain "shape memory" and therefore, when the cardboard blanks are cut from the web, these have a certain tendency to resume the natural curved shape of the web, within the coil formed
20 par celle-ci. Naturellement, le rayon de courbure de la forme naturelle des flans de carton découpés varie en fonction de la spire de la nappe considérée, le rayon de courbure étant naturellement beaucoup plus grand au voisinage de la périphérie de la bobine que dans la partie centrale de celle-ci.20 by it. Naturally, the radius of curvature of the natural shape of the cut cardboard blanks varies according to the turn of the sheet considered, the radius of curvature being naturally much greater in the vicinity of the periphery of the reel than in the central part of that -this.
25 Pour obtenir ultérieurement, après découpage, des flans de carton plat, on a utilisé jusqu'à présent des dispositifs de redressement montés entre la bobine débitant la nappe de carton et l'appareil de découpage situé en aval. Les dispositifs de redressement connus comportent une paire de cylindres de renvoi d'axes parallèles sur lesquels passe la nappe en formant une section plane contenue dans le plan tangent aux deux cylindres de renvoi, et un bloc redresseur monté mobile entre les deux cylindres de renvoi, dans une direction perpendiculaire au plan de la nappe entre ces deux cylindres. Ce bloc redresseur comprend au moins un organe de pression s'étendant transversalement par rapport à la nappe et qui peut venir prendre appui, en exerçant une pression, sur une face de la section plane de la nappe, de manière à la repousser en dehors du plan tangent aux deux cylindres de renvoi et créer ainsi une section de nappe en forme de V entre les deux cylindres. Cette action de l'organe de pression de bloc redresseur mobile permet de casser quelque peu les fibres du carton et de contrebalancer la courbure naturelle de la nappe de carton, ce qui permet d'obtenir ultérieurement des flans de carton plats.To obtain later, after cutting, blanks of flat cardboard, straightening devices have so far been used mounted between the reel delivering the cardboard web and the cutting device located downstream. The devices known rectifier comprise a pair of return cylinders with parallel axes on which the web passes by forming a flat section contained in the plane tangent to the two return cylinders, and a rectifier block mounted movable between the two return cylinders, in a direction perpendicular to the plane of the web between these two cylinders. This rectifier block comprises at least one pressure member extending transversely with respect to the ply and which can come to bear, by exerting pressure, on a face of the planar section of the ply, so as to repel it outside the plane tangent to the two return cylinders and thus create a V-shaped ply section between the two cylinders. This action of the mobile rectifier block pressure member makes it possible to break the fibers of the cardboard somewhat and to counterbalance the natural curvature of the cardboard web, which makes it possible to obtain flat cardboard blanks later.
Naturellement, du fait de la formation de la section en V de la nappe, la longueur de cette nappe entre les deux cylindres de renvoi augmente et il est par conséquent nécessaire de prévoir des moyens permettant de compenser cette augmentation de longueur. Jusqu'à présent cette compensation de l'augmentation de la longueur de la nappe entre les deux cylindres de renvoi a été réalisée en prévoyant un dispositif mécanique auxiliaire, tel qu'un dispositif assurant la formation d'une boucle variable de la nappe, avec un cylindre pantin mobile permettant de faire varier la longueur de la boucle, suivant les besoins, et notamment de raccourcir cette boucle pour compenser l'augmentation de longueur due à la formation de la section en V de la nappe. Une telle solution présente à l'évidence l'inconvénient d'exiger un dispositif mécanique auxiliaire, qui est encombrant et onéreux.Naturally, due to the formation of the V-shaped section of the ply, the length of this ply between the two return cylinders increases and it is therefore necessary to provide means making it possible to compensate for this increase in length. Up to now, this compensation for the increase in the length of the ply between the two return cylinders has been achieved by providing an auxiliary mechanical device, such as a device ensuring the formation of a variable loop of the ply, with a movable puppet cylinder allowing the length of the loop, as required, and in particular to shorten this loop to compensate for the increase in length due to the formation of the V-shaped section of the sheet. Such a solution obviously has the drawback of requiring an auxiliary mechanical device, which is bulky and expensive.
La présente invention vise à remédier à cet inconvénient en procurant un dispositif de redressement de conception particulièrement simple et qui assure de par lui- même la compensation automatique de la longueur de la nappe. A cet effet ce dispositif de redressement d'une nappe de matière, par exemple de carton, défilant en continu, débitée à partir d'une bobine, comprenant un bâti comprenant des supports pour les paliers de deux cylindres de renvoi, d'axes parallèles, sur lesquels passe la nappe en formant une section plane contenue dans un plan tangent aux deux cylindres, et un bloc redresseur monté mobile entre les deux cylindres de renvoi, perpendiculairement à la section de nappe s'étendant entre ces deux cylindres, ce bloc redresseur mobile comprenant au moins un organe de pression transversal pouvant venir prendre appui sur une face de la nappe pour la repousser en dehors du plan tangent aux deux cylindres et lui donner la forme d'un V entre ces deux cylindres, est caractérisé en ce que les supports des paliers des deux cylindres de renvoi constituent des guides pour les paliers montés mobiles sur ces supports et des moyens de liaison sont prévus entre le bloc redresseur mobile et les paliers des cylindres de renvoi de manière à réduire la distance entre les axes des deux cylindres de renvoi en fonction de l'amplitude de la déformation en V de la nappe et à compenser ainsi automatiquement la variation de longueur de cette nappe.The present invention aims to remedy this drawback by providing a straightening device of particularly simple design and which by itself provides automatic compensation for the length of the ply. To this end, this device for straightening a sheet of material, for example cardboard, continuously scrolling, cut from a reel, comprising a frame comprising supports for the bearings of two return cylinders, with parallel axes , over which the ply passes by forming a flat section contained in a plane tangent to the two cylinders, and a rectifier block mounted movably between the two return cylinders, perpendicular to the ply section extending between these two cylinders, this rectifier block mobile comprising at least one transverse pressure member capable of coming to bear on one face of the ply to push it out of the plane tangent to the two cylinders and give it the shape of a V between these two cylinders, is characterized in that the bearing supports of the two return cylinders constitute guides for the bearings mounted movable on these supports and connecting means are provided between the movable rectifier block and the bearings of the return cylinders so as to reduce the distance between the axes of the two cylinders of return as a function of the amplitude of the V-shaped deformation of the ply and thus automatically compensates for the variation in length of this ply.
On décrira ci-après, à titre d'exemple non limitatif, une forme d'exécution de la présente invention, en référence aux dessins annexés sur lesquels :An embodiment of the present invention will be described below, by way of non-limiting example, with reference to the appended drawings in which:
La figure 1 est une vue en élévation schématique simplifiée d'un dispositif de redressement d'une nappe débitée à partir d'une bobine, le bloc redresseur mobile étant représenté en position inactive dans laquelle il n'agit pas sur la nappe.Figure 1 is a simplified schematic elevational view of a device for straightening a sheet fed from a coil, the movable rectifier block being shown in the inactive position in which it does not act on the sheet.
La figure 2 est une vue en élévation schématique simplifiée semblable à celle de la figure 1 , le bloc redresseur mobile étant représenté dans une position active dans laquelle il provoque une déformation en V de la nappe.Figure 2 is a simplified schematic elevational view similar to that of Figure 1, the movable rectifier block being shown in an active position in which it causes a V-shaped deformation of the web.
La figure 3 est une vue en élévation d'une variante d'exécution du dispositif de redressement.Figure 3 is an elevational view of an alternative embodiment of the straightening device.
Ainsi qu'il est représenté sur les figures 1 et 2 du dessin, le dispositif de redressement suivant l'invention, indiqué dans son ensemble par la référence numérique 1 , est destiné à agir sur une nappe 2 défilant en continu et qui est débité à partir d'une bobine amont 3. La nappe 2 peut être une nappe d'une matière quelconque ayant une "mémoire de forme", c'est- à-dire qui tend à reprendre, lorsqu'elle est découpée en morceaux, en aval, sa forme naturelle courbe qu'elle avait antérieurement au sein de la bobine 3. On se référera, par la suite, au traitement d'une nappe de carton mais il va de soi que le dispositif suivant l'invention peut s'appliquer à n'importe quelle autre matière ayant un comportement semblable à celui du carton.As shown in Figures 1 and 2 of the drawing, the straightening device according to the invention, indicated as a whole by the reference numeral 1, is intended to act on a web 2 continuously scrolling and which is delivered at from an upstream coil 3. The sheet 2 can be a sheet of any material having a "shape memory", that is to say which tends to resume, when it is cut into pieces, downstream , its natural curved shape that it previously had within the reel 3. We will refer, thereafter, to the treatment of a sheet of cardboard but it goes without saying that the device according to the invention can be applied to any other material having a behavior similar to that of cardboard.
La nappe 2 qui est débitée à partir de la bobine 3, passe sous un premier cylindre débiteur amont 4, à partir duquel elle est déviée vers le haut, puis sur un cylindre de renvoi amont 5, à partir duquel elle forme une section plane horizontale 2a, puis sur un cylindre de renvoi aval 6, à partir duquel elle est déviée vers le bas, puis sous un cylindre débiteur aval 7, à partir duquel elle s'étend vers un appareil de façonnage quelconque situé en aval, tel qu'un appareil de découpage. L'axe de la bobine 3 et les axes de tous les cylindres 4,5,6,7 sont horizontaux et transversaux par rapport au sens de défilement de la nappe 2. Le dispositif de redressement 1 suivant l'invention comporte un bloc redresseur 8 qui est disposé entre les deux cylindres de renvoi 5 et 6. Ce bloc redresseur 8 est monté mobile verticalement sur le bâti, non représenté, du dispositif 1, ainsi qu'il est indiqué par la flèche f. Autrement dit, le bloc redresseur 8 peut se déplacer perpendiculairement à la section horizontale 2a de la nappe 2 qui est située dans le plan supérieur P tangent horizontalement aux deux cylindres de renvoi 5 et 6. Le bloc redresseur 8 comporte deux organes de pression s'étendant transversalement, à savoir une tige horizontale et transversale supérieure 9, située au-dessus de la section 2a de la nappe, et une tige horizontale et transversale inférieure 1 1 située en dessous de la section 2a. Les tiges de pression 9 et 11 sont séparées l'une de l'autre d'un faible intervalle et elles peuvent agir respectivement sur la section de nappe 2a, suivant le sens du déplacement du bloc redresseur 8. Cet disposition correspond au cas où l'action de compensation de la courbure doit être exercée dans les deux sens. Si la courbure naturelle de la nappe doit être compensée toujours dans le même sens, il va de soi que le bloc redresseur 8 pourrait ne comporter alors qu'une seule des tiges 9 ou 1 1.The sheet 2 which is supplied from the reel 3, passes under a first upstream debtor cylinder 4, from which it is deflected upwards, then on an upstream return cylinder 5, from which it forms a horizontal planar section 2a, then on a downstream return cylinder 6, from which it is deflected downwards, then under a downstream debtor cylinder 7, from which it extends to any shaping device located downstream, such as a cutting device. The axis of the coil 3 and the axes of all the cylinders 4,5,6,7 are horizontal and transverse with respect to the direction of travel of the sheet 2. The rectifying device 1 according to the invention comprises a rectifier block 8 which is disposed between the two return cylinders 5 and 6. This rectifier block 8 is mounted vertically movable on the frame, not shown, of the device 1, as indicated by the arrow f. In other words, the rectifier block 8 can move perpendicular to the horizontal section 2a of the ply 2 which is located in the upper plane P tangent horizontally to the two return cylinders 5 and 6. The rectifier block 8 comprises two pressure members s' extending transversely, namely an upper horizontal and transverse rod 9, situated above the section 2a of the ply, and a lower horizontal and transverse rod 1 1 situated below the section 2a. The stems of pressure 9 and 11 are separated from each other by a small interval and they can act respectively on the ply section 2a, according to the direction of movement of the rectifier block 8. This arrangement corresponds to the case where the action of compensation for curvature should be exercised in both directions. If the natural curvature of the sheet must always be compensated in the same direction, it goes without saying that the rectifier block 8 could then comprise only one of the rods 9 or 11.
Suivant l'invention les paliers respectifs 12 et 13 des cylindres de renvoi 5 et 6 sont montés mobiles sur des supports appropriés 14, 15 prévus sur le bâti du dispositif de redressement 1, ces supports 14,15 étant constitués par des logements ou des cames qui peuvent être rectilignes.According to the invention, the respective bearings 12 and 13 of the return cylinders 5 and 6 are movably mounted on suitable supports 14, 15 provided on the frame of the straightening device 1, these supports 14,15 being constituted by housings or cams which can be straight.
Par ailleurs, des moyens de liaison sont prévus entre le bloc redresseur 8 et les paliers 12, 13 des cylindres de renvoi 5,6. Ces moyens de liaison peuvent être de préférence du type mécanique et ils peuvent être alors constitués, ainsi qu'il est représenté sur les figures 1 et 2, par des bielles 16 et 17, situées toutes les deux en dessous de la section horizontale 2a de la nappe et qui sont articulées, à l'une de leurs extrémités, sur le bloc redresseur 8, autour d'axes respectifs 18,19 et, à leurs autres extrémités, sur les paliers 12, 13 des cylindres de renvoi 5,6. Les axes 18, 19 d'articulation des bielles 16, 17 sont situés à un niveau inférieur à celui de la tige inférieure 11 et symétriquement par rapport au plan vertical et transversale PI contenant les axes des tiges 9 et 11. En position inactive, ainsi qu'il est représenté sur la figure 1 , les axes des cylindres 5,6 sont séparés d'une distance d et les bielles 16, 17 peuvent s'étendre horizontalement, comme il est représenté sur la figure 1, ou bien elles peuvent être inclinées par rapport à l'horizontale, l'angle d'inclinaison dépendant de la géométrie du dispositif de redressement. Par ailleurs, les logements ou cames 14, 15 qui constituent les supports de guidage des paliers mobiles 12, 13 des cylindres de renvoi 5,6, peuvent être, eux aussi, horizontaux ou bien encore inclinés par rapport à l'horizontale, en fonction de la géométrie du dispositif de redressement.Furthermore, connection means are provided between the rectifier block 8 and the bearings 12, 13 of the return cylinders 5,6. These connecting means may preferably be of the mechanical type and they may then be constituted, as shown in FIGS. 1 and 2, by connecting rods 16 and 17, both located below the horizontal section 2a of the ply and which are articulated, at one of their ends, on the rectifier block 8, around respective axes 18,19 and, at their other ends, on the bearings 12, 13 of the return cylinders 5,6. The axes 18, 19 of articulation of the connecting rods 16, 17 are located at a level lower than that of the lower rod 11 and symmetrically with respect to the vertical and transverse plane PI containing the axes of the rods 9 and 11. In the inactive position, thus that it is shown in Figure 1, the axes of the cylinders 5,6 are separated by a distance d and the connecting rods 16, 17 can extend horizontally, as shown in FIG. 1, or they can be inclined relative to the horizontal, the angle of inclination depending on the geometry of the straightening device. Furthermore, the housings or cams 14, 15 which constitute the guide supports for the movable bearings 12, 13 of the return cylinders 5, 6 can also be horizontal or even inclined relative to the horizontal, depending the geometry of the straightening device.
Lorsque le dispositif de redressement 1 est mis en service, c'est-à-dire qu'il est placé dans une position active telle que représentée sur la figure 2, le bloc redresseur 8 est abaissé si bien que sa tige de pression supérieure 9 vient en contact avec la face supérieure de la section de nappe 2a et repousse ensuite cette section vers le bas, en donnant à la section de nappe 2a une forme en V à pointe dirigée vers le bas, ainsi qu'il est représenté sur la figure 2. Cette action de la tige de pression supérieure 9 a pour effet de casser les fibres de la nappe de carton et de compenser la courbure naturelle des flans de carton découpés ultérieurement qui auraient tendance à présenter un "bombé" ou une convexité vers le haut, du fait de la "mémoire de forme" du carton constituant la nappe enroulée sous la forme de la bobine 3. Du fait de la formation de la section de nappe 2a en forme de V, la longueur de la nappe entre les deux cylindres de renvoi 5 et 6 augmente et il est par conséquent nécessaire, pour obtenir un bon fonctionnement de l'ensemble de l'installation, de compenser cette augmentation de longueur de la nappe. Suivant l'invention cette compensation de la longueur de la nappe est obtenue au moyen du dispositif de redressement 1 lui-même. En effet, par suite de la descente du bloc redresseur 8, les axes d'articulation 18, 19 des bielles de liaison respectives 16, 17 sont abaissés, ces bielles 16, 17 passent alors dans des positions inclinées vers le haut, en direction des cylindres de renvoi 5,6 et comme les paliers 12, 13 de ces cylindres de renvoi 5,6 sont guidés sur les supports inclinés 14,15, il en résulte que ces paliers et par conséquent les cylindres 5,6 se rapprochent l'un de l'autre et que la distance entre leurs axes prend une valeur dl inférieure à la distance d qui existe entre ces axes lorsque le dispositif de redressement 1 est en position inactive, ainsi qu'il est représenté sur la figure 1. Cette réduction de la distance entre les axes des cylindresWhen the straightening device 1 is put into service, that is to say it is placed in an active position as shown in FIG. 2, the straightening block 8 is lowered so that its upper pressure rod 9 comes into contact with the upper face of the ply section 2a and then pushes this section down, giving the ply section 2a a V shape with a point directed downwards, as shown in the figure 2. This action of the upper pressure rod 9 has the effect of breaking the fibers of the cardboard web and of compensating for the natural curvature of the cardboard blanks cut later which would tend to have a "bulge" or an upward convexity. , due to the "shape memory" of the cardboard constituting the ply wound in the form of the coil 3. Due to the formation of the ply section 2a in a V shape, the length of the ply between the two cylinders of reference 5 and 6 increases and it is therefore necessary to obtain proper functioning of the entire installation, to compensate for this increase in length of the sheet. According to the invention, this compensation for the length of the ply is obtained by means of the straightening device 1 itself. Indeed, as a result of the descent of the rectifier block 8, the articulation axes 18, 19 of the respective connecting rods 16, 17 are lowered, these rods 16, 17 then pass in positions inclined upwards, towards the return cylinders 5,6 and as the bearings 12, 13 of these return cylinders 5,6 are guided on the inclined supports 14,15, it follows that these bearings and consequently the cylinders 5,6 approach one on the other and that the distance between their axes takes a value dl less than the distance d which exists between these axes when the straightening device 1 is in the inactive position, as shown in FIG. 1. This reduction in the distance between the axes of the cylinders
5,6 permet de compenser l'allongement de la nappe dans sa section en forme de V si bien que la longueur de la nappe entre les deux cylindres débiteurs amont 4 et aval 7 reste constante.5.6 compensates for the elongation of the ply in its V-shaped section so that the length of the ply between the two upstream 4 and downstream 7 supply rolls remains constant.
Du fait que, suivant un agencement préféré de l'invention, les supports 14, 15 constituant des paliers mobilesBecause, according to a preferred arrangement of the invention, the supports 14, 15 constituting movable bearings
12,13 des cylindres de renvoi 5,6 sont de préférence inclinés de bas en haut, en direction du bloc redresseur central 8, les paliers 12,13 se trouvent non seulement rapprochés mais encore légèrement élevés comme il apparaît sur la figure 2, en entraînant un léger allongement de la nappe.12,13 of the return cylinders 5,6 are preferably inclined from bottom to top, in the direction of the central rectifier block 8, the bearings 12,13 are not only close together but also slightly elevated as it appears in FIG. 2, causing a slight elongation of the sheet.
Si l'action du dispositif de redressement 1 devait s'effectuer en sens inverse, le bloc redresseur 8 serait alors déplacé vers le haut, sa tige inférieure 11 soulèverait la section de nappe 2a. afin de former une section en forme de V à pointe dirigée vers le haut, les axes 18, 19 des bielles de liaison 16, 17 seraient entraînés vers le haut, en faisant passer les bielles dans des positions inclinées vers le bas 3 et en direction des cylindres de renvoi 5,6, et les paliers 12,13 seraient là encore rapprochés et légèrement élevés sur leurs supports 14, 15. On obtiendrait un même effet de compensation de la variation de longueur de la nappe 2. Dans la variante d'exécution représentée sur la figureIf the action of the rectifying device 1 were to be carried out in the opposite direction, the rectifier block 8 would then be moved up, its lower rod 11 would raise the ply section 2a. in order to form a V-shaped section with an upward-pointing point, the axes 18, 19 of the connecting rods 16, 17 would be driven upwards, passing the connecting rods in positions inclined downwards 3 and in the direction return cylinders 5,6, and the bearings 12,13 would again be close together and slightly elevated on their supports 14, 15. The same effect would compensate for the variation in length of the ply 2. In the variant of execution shown in the figure
3 les cylindres de renvoi amont 5 et aval 6 sont situés respectivement au-dessous et au-dessus du plan tangent horizontal P suivant lequel s'étend la section horizontale 2a de la nappe 2. Autrement dit, la nappe 2 passe sous le cylindre de renvoi aval 6 et elle est ensuite déviée vers le haut, en direction du cylindre débiteur aval 7 qui est situé au-dessus du plan P. Dans ce cas les bielles 16 reliées aux paliers 12 du cylindre de renvoi amont 5, sont situées sous la section horizontale 2a de la nappe 2, alors que les bielles 17 reliées aux paliers 13 du cylindre de renvoi aval 6 sont situées au-dessus de cette section horizontale 2a. Les axes d'articulation 18,19 des bielles 16, 17 sur le bloc redresseur 8 sont symétriques les uns des autres par rapport à l'intersection du plan horizontal P et du plan vertical PI . Le dispositif de redressement représenté sur la figure 3 est particulièrement intéressant car il peut permettre une compensation à 100% de la variation de longueur de la nappe 2 en jouant sur les profils des cames 14, 15 constituant les supports des paliers 12, 1 .3 the upstream 5 and downstream 6 return cylinders are located respectively below and above the horizontal tangent plane P along which extends the horizontal section 2a of the ply 2. In other words, the ply 2 passes under the cylinder of downstream return 6 and it is then deflected upwards, in the direction of the downstream debtor cylinder 7 which is located above the plane P. In this case the connecting rods 16 connected to the bearings 12 of the upstream return cylinder 5, are located under the horizontal section 2a of the ply 2, while the connecting rods 17 connected to the bearings 13 of the downstream return cylinder 6 are located above this horizontal section 2a. The articulation axes 18, 19 of the connecting rods 16, 17 on the rectifier block 8 are symmetrical to one another with respect to the intersection of the horizontal plane P and the vertical plane PI. The straightening device shown in Figure 3 is particularly interesting because it can allow 100% compensation for the variation in length of the ply 2 by playing on the profiles of the cams 14, 15 constituting the supports of the bearings 12, 1.
Bien que les moyens de liaison entre le bloc redresseur mobile 8 et les cylindres de renvoi 5,6 aient été décrits comme étant constitués par des bielles, il va de soi qu'ils pourraient être réalisés de toute autre façon, notamment par des moyens pneumatiques, hydrauliques, électriques etc.. asservissant le déplacement des paliers mobiles 12,13 des cylindres de renvoi 5,6 au mouvement du bloc redresseur 8. Although the connecting means between the movable rectifier block 8 and the return cylinders 5,6 have been described as being constituted by connecting rods, it goes without saying that they could be produced in any other way, in particular by pneumatic means , hydraulic, electrical, etc., controlling the movement of the movable bearings 12, 13 of the return cylinders 5, 6 to the movement of the rectifier block 8.

Claims

REVENDICATIONS
1.- Dispositif de redressement (1) d'une nappe de matière (2), par exemple de carton, défilant en continu, débitée à partir d'une bobine (3), comprenant un bâti comprenant des 5 supports ( 14, 15) pour les paliers (12, 13) de deux cylindres de renvoi (5,6), d'axes parallèles, sur lesquels passe la nappe en formant une section plane (2a) contenue dans un plan (P) tangent aux deux cylindres, et un bloc redresseur (8) monté mobile entre les deux cylindres de renvoi (5,6), ι o perpendiculairement à la section de nappe (2a) s'étendant entre ces deux cylindres (5,6), ce bloc redresseur mobile (8) comprenant au moins un organe de pression transversal (9,11) pouvant venir prendre appui sur une face de la nappe (2) pour la repousser en dehors du plan (P) tangent aux deux cylindres1.- Straightening device (1) of a sheet of material (2), for example of cardboard, continuously scrolling, cut from a reel (3), comprising a frame comprising 5 supports (14, 15 ) for the bearings (12, 13) of two return cylinders (5,6), of parallel axes, over which the web passes by forming a planar section (2a) contained in a plane (P) tangent to the two cylinders, and a rectifier block (8) mounted mobile between the two return cylinders (5,6), ι o perpendicular to the ply section (2a) extending between these two cylinders (5,6), this mobile rectifier block ( 8) comprising at least one transverse pressure member (9,11) which can come to bear on one face of the ply (2) to push it out of the plane (P) tangent to the two cylinders
15 et lui donner la forme d'un V entre ces deux cylindres, caractérisé en ce que les supports (14, 15) des paliers ( 12,13) des deux cylindres de renvoi (5,6) constituent des guides pour les paliers (12,13) montés mobiles sur ces supports et des moyens de liaison (16, 17) sont prévus entre le bloc redresseur15 and give it the shape of a V between these two cylinders, characterized in that the supports (14, 15) of the bearings (12,13) of the two return cylinders (5,6) constitute guides for the bearings ( 12,13) mounted movably on these supports and connecting means (16, 17) are provided between the rectifier block
20 mobile (8) et les paliers (12,13) des cylindres de renvoi (5,6) de manière à réduire la distance (d) entre les axes des deux cylindres de renvoi (5,6) en fonction de l'amplitude de la déformation en V de la nappe (2) et à compenser ainsi automatiquement la variation de longueur de cette nappe.20 mobile (8) and the bearings (12,13) of the return cylinders (5,6) so as to reduce the distance (d) between the axes of the two return cylinders (5,6) depending on the amplitude of the V-shaped deformation of the ply (2) and thus automatically compensates for the variation in length of this ply.
25 2.- Dispositif suivant la revendication 1 caractérisé en ce que les supports (14,15) formant guides pour les paliers (12,13) sont constitués par des logements ou cames rectilignes inclinés par rapport au plan (P) tangent aux deux cylindres de renvoi (5,6).25 2.- Device according to claim 1 characterized in that the supports (14,15) forming guides for the bearings (12,13) consist of housings or straight cams inclined with respect to the plane (P) tangent to the two return cylinders (5,6).
3.- Dispositif suivant la revendication 1 caractérisé en ce que les supports ( 14, 15) formant guides pour les paliers (12, 13) sont constitués par des logements ou des cames non rectilignes.3.- Device according to claim 1 characterized in that the supports (14, 15) forming guides for the bearings (12, 13) consist of housings or non-rectilinear cams.
4.- Dispositif suivant l'une quelconque des revendications précédentes caractérisé en ce que les moyens de liaison sont constitués par des bielles (16,17) qui sont articulées, à l'une de leurs extrémités, sur le bloc redresseur (8), autour d'axes respectifs (18, 19) et, à leurs autres extrémités, sur les paliers (12,13) des cylindres de renvoi (5,6). 4.- Device according to any one of the preceding claims, characterized in that the connection means consist of connecting rods (16,17) which are articulated, at one of their ends, on the rectifier block (8), around respective axes (18, 19) and, at their other ends, on the bearings (12,13) of the return cylinders (5,6).
PCT/FR1994/000327 1993-03-24 1994-03-24 Device for straightening a sheet of material, for example cardboard, supplied continuously WO1994021546A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP6520736A JPH07507530A (en) 1993-03-24 1994-03-24 A device that stretches sheets such as cardboard that are continuously fed.
EP94911214A EP0642461B1 (en) 1993-03-24 1994-03-24 Device for straightening a sheet of material, for example cardboard, supplied continuously
DE69405180T DE69405180T2 (en) 1993-03-24 1994-03-24 DEVICE FOR STRAIGHTING A CONTINUOUSLY RUNNING TRAIN, EXAMPLE FROM CARDBOARD

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR93/03398 1993-03-24
FR9303398A FR2702993B1 (en) 1993-03-24 1993-03-24 DEVICE FOR STRAIGHTENING A TABLE OF MATERIAL, FOR EXAMPLE CARDBOARD, CONTINUOUSLY MOVING.

Publications (1)

Publication Number Publication Date
WO1994021546A1 true WO1994021546A1 (en) 1994-09-29

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Application Number Title Priority Date Filing Date
PCT/FR1994/000327 WO1994021546A1 (en) 1993-03-24 1994-03-24 Device for straightening a sheet of material, for example cardboard, supplied continuously

Country Status (5)

Country Link
EP (1) EP0642461B1 (en)
JP (1) JPH07507530A (en)
DE (1) DE69405180T2 (en)
FR (1) FR2702993B1 (en)
WO (1) WO1994021546A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0876978A2 (en) * 1997-03-28 1998-11-11 BIELOMATIK LEUZE GmbH + Co. Device to curl ply-material, especially paper
WO2012145878A1 (en) * 2011-04-27 2012-11-01 Zhu Qingdong Curl leveling device for corrugated paper board

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5165418B2 (en) * 2008-03-06 2013-03-21 株式会社ミヤコシ Decurler device and continuous paper processing apparatus using the decurler device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0341971A2 (en) * 1988-05-10 1989-11-15 Kobayashi Engineering Works, Ltd. Sheet curls reformer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0341971A2 (en) * 1988-05-10 1989-11-15 Kobayashi Engineering Works, Ltd. Sheet curls reformer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0642461A1 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0876978A2 (en) * 1997-03-28 1998-11-11 BIELOMATIK LEUZE GmbH + Co. Device to curl ply-material, especially paper
EP0876978A3 (en) * 1997-03-28 1999-08-18 BIELOMATIK LEUZE GmbH + Co. Device to curl ply-material, especially paper
US6302678B1 (en) 1997-03-28 2001-10-16 Bielomatik Leuze Gmbh & Co. Setting device for bending layer material more particularly paper
WO2012145878A1 (en) * 2011-04-27 2012-11-01 Zhu Qingdong Curl leveling device for corrugated paper board

Also Published As

Publication number Publication date
DE69405180T2 (en) 1998-04-02
JPH07507530A (en) 1995-08-24
FR2702993A1 (en) 1994-09-30
EP0642461B1 (en) 1997-08-27
EP0642461A1 (en) 1995-03-15
FR2702993B1 (en) 1995-12-08
DE69405180D1 (en) 1997-10-02

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