EP1522512B1 - Working station in a machine transforming plate-like elements - Google Patents
Working station in a machine transforming plate-like elements Download PDFInfo
- Publication number
- EP1522512B1 EP1522512B1 EP03405716A EP03405716A EP1522512B1 EP 1522512 B1 EP1522512 B1 EP 1522512B1 EP 03405716 A EP03405716 A EP 03405716A EP 03405716 A EP03405716 A EP 03405716A EP 1522512 B1 EP1522512 B1 EP 1522512B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gripper bar
- bar
- frame
- chains
- sheet
- 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.)
- Expired - Lifetime
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- 230000001131 transforming effect Effects 0.000 title 1
- 230000001133 acceleration Effects 0.000 description 8
- 238000013459 approach Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/02—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles
- B65H29/04—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands
- B65H29/042—Intermediate conveyors, e.g. transferring devices
- B65H29/044—Intermediate conveyors, e.g. transferring devices conveying through a machine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2402/00—Constructional details of the handling apparatus
- B65H2402/30—Supports; Subassemblies; Mountings thereof
- B65H2402/31—Pivoting support means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2403/00—Power transmission; Driving means
- B65H2403/50—Driving mechanisms
- B65H2403/51—Cam mechanisms
- B65H2403/513—Cam mechanisms involving elongated cam, i.e. parallel to linear transport path
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/30—Chains
- B65H2404/34—Gripper bars bridging at least two chains running synchronously and parallely
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/17—Nature of material
- B65H2701/176—Cardboard
- B65H2701/1762—Corrugated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/42—Die-cutting
Definitions
- the present invention relates to a work station of a plate element processing machine, for example a waste ejection station of a sheet cut by a platen press, comprising a frame, a tool for for example an ejection plate on which said sheet is to be laid, a transverse clip bar for grasping the front edge of this sheet, two flexible drive elements in the form of endless loops each secured to one end of said gripper bar, means for guiding said flexible drive members to said frame and means for moving said gripper bar of said work tool when said gripper bar crosses the downstream end of said work tool.
- the object of the present invention is to overcome, at least in part, the disadvantages of the aforementioned solutions.
- the subject of the present invention is a work station of a plate element processing machine according to claim 1.
- the terms “front” and “rear” refer to the direction of travel F of the clamp bar. Since the invention relates especially to the laying of the treated sheets on the working tool, preferably the ejection plate and not ejection itself, the ejection of the blanks and the means used for this ejection will not be described or represented in the description that follows. Moreover, since the mechanism of the ejection device to be described is symmetrical with respect to the median longitudinal axis of the platen press with which this ejection device is associated, this axis corresponding to the direction of transport F sheets only one side of this work station is represented by the figures of the accompanying drawing and will therefore be described in the course of the description.
- the work station illustrated in FIGS. 1 to 3 comprises a frame 1, of which only the part situated on one side of the path of the sheets to be treated is seen, a transverse clamp bar 2 provided with clamps 3 for gripping the edge. before leaves to be treated (not shown).
- Each end of this gripper bar is connected to a drive chain 4 by two hinge pins 5 front, respectively rear 6, of this drive chain 4, each attached to a connecting piece 7 which extends from two sides of the drive chain 4.
- These two pins 5, 6 are located at both ends of the drive chain 4 joined to each other by the connecting piece 7 forming an endless loop.
- clamp bar 2 Only one side of the clamp bar 2 being visible in the figures of the drawing, we also see only one chain.
- the connection between the clamp bar 2 and the drive chains 4 is well known to those skilled in the art and does not need to be described in more detail to understand the present invention.
- Each drive chain 4 is supported on a guide bar 8 and passes on two chain wheels (not shown) conventionally in this type of machine.
- the drive chains 4 on which a certain tension is exerted therefore tend to maintain the front and rear articulation pins 5 in alignment with the other links of these drive chains 4, thus also serving as a return means for maintain the clamp bar 2 in a predetermined angular position with respect to the front and rear articulation axes 5 and 6.
- this guide bar 8 has, at the exit of the work station, the place where the clip bar 2 places each sheet on an ejection plate 9, a short descending ramp 8a followed by an interruption over a certain length. At the end of the interruption, we find the guide bar 8 which begins with a short ascending ramp 8b.
- a lowering cam 10 of the clamp bar 2 is opposite the interruption of the guide bar 8.
- This cam 10 is fixed to the frame 1 by screws 11.
- the upper edge of this cam 10 is located under a portion protruding the frame 1 ( Figures 1 and 2).
- a feeler wheel 12 integral with the clamp bar 2 is preferably located at each end of this clamp bar 2.
- This roller is arranged close to the rear articulation axis 6 of the drive chain. 4, connecting the latter to the connecting piece 7 and which is located near the clamps 3 of the clamp bar 2 and that of the feeler roller 12.
- the fixed cam 10 makes it possible to limit the accelerations communicated to the clamp bar 2 during its tilting movement around the front axle 5.
- This lengthening of the length of the stroke of the gripper bar 2 during which this gripper bar is lowered is added to the fact that the distance between the hinge pins 5 and 6 connecting these strings of drive 4 to the clamp bar 2 is slightly greater than the length of a link of these chains 4, increasing the pivoting radius of the movable axis 6 about the fixed axis 5 resting on the guide bar 8.
- the means used to obtain this result are particularly simple, both from the point of view of the manufacture and the use of the machine.
- the means used are substantially simpler than in most of the solutions proposed to bring the cut sheets on the ejector plate.
- the solution according to the present invention is just as simple but allows on the other hand to reduce the accelerations communicated to the gripper bar, which is not possible when the length of the cam is limited by the center distances of the links of the drive chains 4.
- the length of these cams can not substantially exceed that of the companies. axes.
- the descent stroke of the gripper bars being a constant as well as the length of the links
- the acceleration communicated to the gripper bar 2 by the downcomers 10 is a function of the driving speed of the gripper bars. clamps and this is what limits this drive speed and therefore the rate of the platen press.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Advancing Webs (AREA)
- Discharge By Other Means (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
- Press Drives And Press Lines (AREA)
- Chain Conveyers (AREA)
- Jigs For Machine Tools (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
La présente invention se rapporte à un une station de travail d'une machine de transformation d'éléments en plaques, par exemple une station d'éjection des déchets d'une feuille découpée par une presse à platine, comprenant un bâti, un outil de travail par exemple une plaque d'éjection sur laquelle ladite feuille doit être posée, une barre de pinces transversale pour saisir le bord avant de cette feuille, deux éléments d'entraînement souples en forme de boucles sans fins solidaires chacun d'une extrémité de ladite barre de pinces, des moyens pour guider lesdits éléments d'entraînement souple sur ledit bâti et des moyens pour rapprocher ladite barre de pinces dudit outil de travail lorsque cette barre de pinces franchit l'extrémité aval de cet outil de travail .The present invention relates to a work station of a plate element processing machine, for example a waste ejection station of a sheet cut by a platen press, comprising a frame, a tool for for example an ejection plate on which said sheet is to be laid, a transverse clip bar for grasping the front edge of this sheet, two flexible drive elements in the form of endless loops each secured to one end of said gripper bar, means for guiding said flexible drive members to said frame and means for moving said gripper bar of said work tool when said gripper bar crosses the downstream end of said work tool.
Plusieurs solutions ont déjà été proposées pour mettre les feuilles transportées par la barre de pinces en contact avec la plaque d'éjection. Parmi celles-ci on peut répartir les solutions proposées entre celles dans lesquelles la barre de pinces reste sur une trajectoire rectiligne et où l'outil de travail, par exemple la plaque d'éjection, voire le seul bord avant de cet outil, se déplace vers la feuille et celles dans lesquelles la barre de pince se rapproche de l'outil de travail. Parmi les secondes solutions, on a proposé de déplacer les guides-chaînes et la barre de pince, le mouvement étant synchronisé sur la commande d'autres mouvements de travail de l'élément en plaque, par exemple de l'éjection. Une telle solution est extrêmement complexe dans la mesure où pour déplacer un tel ensemble, il est nécessaire de prévoir des moyens de guidage des cames. En outre, la masse d'un tel ensemble mobile pose des problèmes d'accélérations qui limitent les cadences de la machine et nécessite des guides-chaînes articulés complexes avec des biellettes d'actionnement pour provoquer l'allongement des guides-chaînes pour leur permettre de suivre la trajectoire des chaînes.Several solutions have already been proposed to put the sheets carried by the clamp bar in contact with the ejection plate. Among these we can distribute the solutions proposed between those in which the gripper bar remains on a straight path and where the working tool, for example the ejection plate, or even the only front edge of this tool, moves to the sheet and those in which the clamp bar approaches the work tool. Among the second solutions, it has been proposed to move the chain guides and the clamp bar, the movement being synchronized to the control of other working movements of the plate element, for example ejection. Such a solution is extremely complex in that to move such an assembly, it is necessary to provide means for guiding the cams. In addition, the mass of such a moving assembly poses problems of accelerations which limit the rates of the machine and require complex articulated chain guides with actuating rods to cause the extension of the chain guides to enable them to follow the path of the chains.
On a proposé de résoudre ce problème en insérant une came aux extrémités de la barre de pince entre deux maillons des chaînes et en disposant un galet fixe dans la trajectoire de ces cames. La longueur de ces cames est donc limitée par celle de la pièce d'attache de la barre de pinces aux chaînes dont la longueur est elle-même limitée par le diamètre des roues de la chaîne, de sorte que l'accélération communiquée à la barre de pince est très grande. Si celle-ci est supportable dans le cas de feuilles de carton épais, notamment dans le cas de feuilles de carton ondulé, elle ne l'est pas pour des feuilles plus minces et donc plus fragiles. Il n'est pas possible d'accroître la longueur de ces cames du fait que les chaînes d'entraînement des barres de pinces forment des boucles sans fin qui tournent sur des roues, de sorte que la longueur des cames ne peut pas excéder celle des maillons de ces chaînes.It has been proposed to solve this problem by inserting a cam at the ends of the clamp bar between two links of the chains and placing a fixed roller in the path of these cams. The length of these cams is therefore limited by that of the attachment piece of the clip bar chain whose length is itself limited by the diameter of the wheels of the chain, so that the acceleration communicated to the bar clamp is very big. If it is bearable in the case of thick cardboard sheets, especially in the case of sheets of corrugated cardboard, it is not for thin sheets and therefore more fragile. It is not possible to increase the length of these cams because the drive chains of the clip bars form endless loops which rotate on wheels, so that the length of the cams can not exceed that of the cams. links of these chains.
On a encore proposé d'infléchir la trajectoire de la barre de pinces par la forme des guides-chaînes, pour faire descendre cette barre de pinces à son point d'arrêt qui correspond à l'endroit où les pinces de la barre sont à l'extrémité avant de l'outil de travail. Une telle solution consiste en quelque sorte à créer un défaut dans le guidage normal des chaînes, les obligeant à épouser cette trajectoire infléchie, non seulement lorsque la barre de pinces arrive à son point d'arrêt et lorsque sa vitesse est faible, voire nulle, mais tout au long du reste du cycle de déplacement des feuilles où la vitesse est élevée, ce qui pose évidemment des problèmes d'usure et de vibrations.It has also been proposed to bend the trajectory of the gripper bar by the shape of the chain guides, to move the gripper bar down to its stopping point, which corresponds to the point where the grippers of the bar are at the same time. front end of the work tool. Such a solution consists in some way in creating a defect in the normal guiding of the chains, forcing them to marry this inflected trajectory, not only when the gripper bar reaches its stopping point and when its speed is low, or even zero, but throughout the rest of the cycle of movement of the sheets where the speed is high, which obviously poses problems of wear and vibration.
Le but de la présente invention est de remédier, au moins en partie, aux inconvénients des solutions susmentionnées.The object of the present invention is to overcome, at least in part, the disadvantages of the aforementioned solutions.
A cet effet, la présente invention a pour objet une station de travail d'une machine de transformation d'éléments en plaques selon la revendication 1.For this purpose, the subject of the present invention is a work station of a plate element processing machine according to
Grâce à cette solution, les masses en mouvement sont relativement faibles. Le fait que la came d'abaissement de la barre de pinces se trouve sur le bâti de la presse à platine et non plus entre deux maillons de la chaîne permet d'augmenter sensiblement sa longueur, puisque celle-ci n'est plus tributaire de celle des maillons et de réduire les accélérations. De ce fait, la station de travail selon la présente invention peut être utilisée pour traiter des feuilles plus minces et moins rigides que celles qui pouvaient être traitées dans le cas de l'art antérieur. Un autre avantage de cette solution réside dans sa simplicité, gage de fiabilité. Comme on pourra le constater au cours de la description qui suit, le réglage des éléments de cette station de travail est précis et facile à effectuer.Thanks to this solution, moving masses are relatively weak. The fact that the lowering cam of the gripper bar is on the frame of the platen press and no longer between two links of the chain makes it possible to substantially increase its length, since the latter is no longer dependent on that of links and reduce accelerations. As a result, the workstation according to the present invention can be used to process thinner and less rigid sheets than those which could be processed in the case of the prior art. Another advantage of this solution lies in its simplicity, a guarantee of reliability. As will be apparent from the following description, the setting of the elements of this workstation is accurate and easy to perform.
D'autre particularités et avantages de la présente invention apparaîtront au cours de la description qui suit et qui sera faite à l'aide des dessins annexés qui illustrent, schématiquement et à titre d'exemple, une forme d'exécution de la station de travail d'une machine de transformation d'éléments en plaques, appliqué de préférence dans une station d'éjection, objet de la présente invention.
- La figure 1 est une vue en coupe selon la ligne I-I de la figure 3;
- la figure 2 est une vue en élévation selon la ligne II-II de la figure 1;
- la figure 3 est une vue de dessus selon la ligne III-III de la figure 1.
- Figure 1 is a sectional view along line II of Figure 3;
- Figure 2 is an elevational view along the line II-II of Figure 1;
- FIG. 3 is a view from above along the line III - III of FIG.
Dans la description qui suit, les termes «avant» et «arrière» se réfèrent à la direction de déplacement F de la barre de pince. Etant donné que l'invention se rapporte spécialement à la pose des feuilles traitées sur l'outil de travail, de préférence, la plaque d'éjection et non à l'éjection proprement dite, l'éjection des découpes et les moyens utilisé pour cette éjection ne seront ni décrits, ni représentés au cours de la description qui suit. Par ailleurs, puisque le mécanisme du dispositif d'éjection qui sera décrit est symétrique par rapport à l'axe longitudinal médian de la presse à platine à laquelle ce dispositif d'éjection est associé, cet axe correspondant à la direction de transport F des feuilles découpées, seul un côté de cette station de travail est représenté par les figures du dessin annexé et sera donc décrit au cours de la description.In the following description, the terms "front" and "rear" refer to the direction of travel F of the clamp bar. Since the invention relates especially to the laying of the treated sheets on the working tool, preferably the ejection plate and not ejection itself, the ejection of the blanks and the means used for this ejection will not be described or represented in the description that follows. Moreover, since the mechanism of the ejection device to be described is symmetrical with respect to the median longitudinal axis of the platen press with which this ejection device is associated, this axis corresponding to the direction of transport F sheets only one side of this work station is represented by the figures of the accompanying drawing and will therefore be described in the course of the description.
La station de travail illustrée par les figures 1 à 3 comporte un bâti 1, dont on ne voit que la partie située d'un côté de la trajectoire des feuilles à traiter, une barre de pinces 2 transversale munie de pinces 3 pour pincer le bord avant des feuilles à traiter (non représentées). Chaque extrémité de cette barre de pince est reliée à une chaîne d'entraînement 4 par deux axes d'articulation avant 5, respectivement arrière 6, de cette chaîne d'entraînement 4, fixés chacun à une pièce de liaison 7 qui s'étend des deux côtés de la chaîne d'entraînement 4. Ces deux axes 5, 6 sont situés aux deux extrémités de la chaîne d'entraînement 4 réunies l'une à l'autre par la pièce de liaison 7 en formant une boucle sans fin.The work station illustrated in FIGS. 1 to 3 comprises a
Un seul côté de la barre de pinces 2 étant visible sur les figures du dessin, on ne voit aussi qu'une chaîne. La liaison entre la barre de pinces 2 et les chaînes d'entraînement 4 est bien connue de l'homme de métier et n'a pas besoin d'être décrite plus en détail pour comprendre la présente invention.Only one side of the
Chaque chaîne d'entraînement 4 prend appui sur un guide-chaîne 8 et passe sur deux roues à chaînes (non représentées) de façon classique dans ce type de machine. Les chaînes d'entraînement 4 sur lesquelles une certaine tension est exercée tendent donc à maintenir les axes d'articulation avant 5 et arrière 6 dans l'alignement des autres maillons de ces chaînes d'entraînement 4, servant ainsi également de moyens de rappel pour maintenir la barre de pince 2 dans une position angulaire déterminée par rapport aux axes d'articulation avant 5 et arrière 6. Comme on peut le voir sur la figure 1, ce guide-chaîne 8 présente, à la sortie du poste de travail, à l'endroit où la barre de pinces 2 pose chaque feuille sur une plaque d'éjection 9, une courte rampe descendante 8a suivie d'une interruption sur une certaine longueur. A la fin de l'interruption, on retrouve le guide-chaîne 8 qui débute par une courte rampe ascendante 8b.Each drive chain 4 is supported on a
Une came 10 de descente de la barre de pinces 2 se trouve en face de l'interruption du guide-chaîne 8. Cette came 10 est fixée au bâti 1 par des vis 11. Le bord supérieur de cette came 10 se situe sous une portion saillante la du bâti 1 (figures 1 et 2).A lowering
Un galet palpeur 12, solidaire de la barre de pinces 2, est situé, de préférence, à chaque extrémité de cette barre de pince 2. Ce galet est disposé à proximité de l'axe d'articulation arrière 6 de la chaîne d'entraînement 4, reliant cette dernière à la pièce de liaison 7 et qui se situe à proximité des pinces 3 de la barre de pinces 2 ainsi qu'à celle du galet palpeur 12.A
Lorsque ce galet palpeur 12 solidaire de la barre de pinces 2 arrive sous la came 10, il fait descendre progressivement l'arrière de la barre de pinces 2. L'axe avant 5 étant retenu par le guide-chaîne 8, la barre de pince pivote autour de cet axe avant 5 d'un angle α comme dans la position illustrée par la figure 1, amenant le bord avant de la feuille, tenu par les pinces 3 de la barre de pinces 2, au niveau de l'outil de travail 9.When this feeler
Etant donné que le pivotement du bord arrière de la barre de pinces 2 par la came 10 provoque une surtension des chaînes d'entraînement 4, lorsque la barre de pinces 2 continue son déplacement dans la direction de la flèche F, le galet palpeur 12 suit le bord inférieur de la came 10 et fait ainsi remonter l'axe de pivotement arrière 6 de la barre de pinces 2. Cet axe de pivotement arrière 6 rencontre ensuite la rampe ascendante 8b du guide-chaîne 8 qui guide à nouveau les deux axes d'articulation 5, 6 entre la barre de pinces 2 et les chaînes d'entraînement 4 qui se situent aux deux extrémités de cette barre de pinces 2.Since the pivoting of the rear edge of the
Comme on peut le constater, la came fixe 10, dont la longueur n'est pas limitée par celle des maillons des chaînes d'entraînement, permet de limiter les accélérations communiquées à la barre de pinces 2 au cours de son mouvement de basculement autour de l'axe avant 5. Cet allongement de la longueur de la course de la barre de pinces 2 pendant laquelle cette barre de pinces est abaissée s'ajoute au fait que la distance entre les axes d'articulation 5 et 6 reliant ces chaînes d'entraînement 4 à la barre de pinces 2 est légèrement supérieure à la longueur d'un maillon de ces chaînes 4, augmentant le rayon de pivotement de l'axe mobile 6 autour de l'axe fixe 5 en appui sur le guide-chaîne 8.As can be seen, the
Les moyens mis en oeuvre pour obtenir ce résultat sont particulièrement simples, aussi bien du point de vue de la fabrication que de l'utilisation de la machine. Les moyens utilisés sont sensiblement plus simples que dans la plupart des solutions proposées pour amener les feuilles découpées sur la plaque d'éjection. Par rapport à la solution qui utilise des cames mobiles solidaire des chaînes d'entraînement, la solution selon la présente invention est tout aussi simple mais permet par contre de réduire les accélérations communiquées à la barre de pinces, ce qui n'est pas possible lorsque la longueur de la came est limitée par les entre-axes des maillons des chaînes d'entraînement 4.The means used to obtain this result are particularly simple, both from the point of view of the manufacture and the use of the machine. The means used are substantially simpler than in most of the solutions proposed to bring the cut sheets on the ejector plate. Compared to the solution which uses moving cams integral with the drive chains, the solution according to the present invention is just as simple but allows on the other hand to reduce the accelerations communicated to the gripper bar, which is not possible when the length of the cam is limited by the center distances of the links of the drive chains 4.
En effet, comme ces chaînes d'entraînement doivent passer autour de roues à chaînes pour ramener les barres de pinces prendre une autre feuille pour effectuer un nouveau cycle de découpage/éjection, la longueur de ces cames ne peut pas excéder sensiblement celle des entre-axes. De ce fait, la course de descente des barres de pinces étant une constante de même que la longueur des maillons, l'accélération communiquée à la barre de pinces 2 par les cames de descente 10 est fonction de la vitesse d'entraînement des barres de pinces et c'est ce qui limite cette vitesse d'entraînement et par conséquent la cadence de la presse à platine.Indeed, as these drive chains must pass around chain wheels to return the gripper bars take another sheet to perform a new cutting / ejection cycle, the length of these cams can not substantially exceed that of the companies. axes. As a result, the descent stroke of the gripper bars being a constant as well as the length of the links, the acceleration communicated to the
En permettant d'augmenter sensiblement la durée de la phase de descente de la barre de pinces grâce à l'augmentation sensible de la longueur de la came 10 par rapport aux cames solidaires des chaînes d'entraînement et grâce au fait que l'écartement entre les axes d'articulation avant 5 et arrière 6 qui relient la barre de pinces 2 aux chaînes d'entraînement 4, est supérieur à la longueur des maillons, on peut donc accroître sensiblement, à accélération constante, la cadence de traitement des feuilles découpées par la presse à platine à laquelle le dispositif selon la présente invention est associé. Suivant la nature des feuilles à traiter, on pourrait au contraire conserver une cadence moins élevée de manière à réduire les accélérations communiquées à la feuille lors de l'abaissement de la barre de pinces 2.By making it possible to substantially increase the duration of the lowering phase of the gripper bar by significantly increasing the length of the
Certaines variantes de la station de travail décrite pourraient être envisagées. Ainsi, bien que la description qui précède parle de l'utilisation de chaînes d'entraînement 4, qui constituent les moyens traditionnels d'entraînement dans ce type de machine, on pourrait aussi envisager l'utilisation de tout autre moyen de liaison et d'entraînement tel que courroies, courroies dotées d'éléments d'entraînement, courroies métalliques ou à armature, etc. Bien que dans la forme d'exécution illustrée, les moyens pour rappeler la barre de pince 2 dans une position déterminée autour des axes avant 5 et arrière 6 sont constitués par la tension des chaînes d'entraînement, on pourrait aussi imaginer un autre mode de liaison entre la barre de pinces 2 et les chaînes d'entraînement 4 et des moyens distincts de ces chaînes 4 pour rappeler la barre de pinces 2 dans une position déterminée autour d'un seul axe transversal solidaire des chaînes 4. Enfin, bien que de préférence on utilise deux cames de descente 10, une à chaque extrémité de la barre de pinces, on pourrait aussi n'en utiliser qu'une qui pourrait aussi être située au milieu de la barre de pinces plutôt qu'à une extrémité.Some variants of the described workstation could be considered. Thus, although the foregoing description speaks of the use of drive chains 4, which constitute the traditional means of driving in this type of machine, it could also be envisaged to use any other connecting means and such as belts, belts with drive elements, metal or reinforced belts, etc. Although in the illustrated embodiment, the means for returning the
Claims (3)
- A working station of a machine for converting elements in sheet form, comprising a frame (1), a working tool (9) on which the said sheet is to be delivered, a transverse gripper bar (2) to engage the leading edge of said sheet, two flexible drive elements (4) in the form of endless loops each fixedly attached to one end of the said gripper bar (2), means for guiding said flexible drive elements on said frame and means for bringing the said gripper bar (2) close to the working tool (9) when said gripper bar (2) clears the downstream end of said working tool (9), characterized in that the said gripper bar (2) has at least one transverse pivot spindle (5, 6) with respect to the drive elements and is associated with return means (4) to hold it in a given position about the said transverse pivot spindle (5, 6), and at least one cam follower (12) forming a lever arm with respect to the said transverse pivot spindle and in that a cam (10) for lowering said gripper bar (2) fixedly attached to the said frame (1) is disposed on the trajectory of said cam follower (12) to cause pivoting of the said gripper bar (2) about said pivot spindle (5, 6) so as temporarily to bring the said grippers close to the said working tool (9).
- A working station according to claim 1, wherein two drive chains (4) having two pivot spindles, a front one (5) and a rear one (6) respectively each fixedly attached to the respective ends of said gripper bar (2), chain guides (8) fixedly attached to the said frame (1) are in contact with said chains (4) and are so configured as to enable the rear of the said gripper bar (2) to pivot about the said front pivot spindle (5) bearing on said chain guides (8) when said cam followers (12) come into contact with the said cams (10).
- A working station according to any one of the preceding claims, wherein the said cam followers (12) are situated near the said rear pivot spindles (6) between said gripper bar (2) and the said drive chains.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES03405716T ES2259755T3 (en) | 2003-10-07 | 2003-10-07 | WORK STATION OF A TRANSFORMING MACHINE OF ELEMENTS IN SHEETS. |
| DE60303918T DE60303918T2 (en) | 2003-10-07 | 2003-10-07 | Workstation of a plate-shaped element conversion machine |
| AT03405716T ATE319640T1 (en) | 2003-10-07 | 2003-10-07 | WORK STATION OF A CONVERSION MACHINE FOR PLATE-SHAPED ELEMENTS |
| EP03405716A EP1522512B1 (en) | 2003-10-07 | 2003-10-07 | Working station in a machine transforming plate-like elements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03405716A EP1522512B1 (en) | 2003-10-07 | 2003-10-07 | Working station in a machine transforming plate-like elements |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1522512A1 EP1522512A1 (en) | 2005-04-13 |
| EP1522512B1 true EP1522512B1 (en) | 2006-03-08 |
Family
ID=34307061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03405716A Expired - Lifetime EP1522512B1 (en) | 2003-10-07 | 2003-10-07 | Working station in a machine transforming plate-like elements |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1522512B1 (en) |
| AT (1) | ATE319640T1 (en) |
| DE (1) | DE60303918T2 (en) |
| ES (1) | ES2259755T3 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH690097A5 (en) * | 1994-05-04 | 2000-04-28 | Bobst Sa | A fastening device of a gripper bar to a bar chains within a machine processing plate elements. |
| CH690098A5 (en) * | 1994-05-04 | 2000-04-28 | Bobst Sa | Gripper bar comprising a fastening device with an undercarriage in a machine processing plate elements. |
| DE19848453A1 (en) * | 1997-11-18 | 1999-05-20 | Heidelberger Druckmasch Ag | Chain conveyor for moving sheets in printing machines |
| CH693794A5 (en) * | 2000-05-05 | 2004-02-13 | Bobst Sa | Device for positioning sheets in a machine station. |
-
2003
- 2003-10-07 EP EP03405716A patent/EP1522512B1/en not_active Expired - Lifetime
- 2003-10-07 DE DE60303918T patent/DE60303918T2/en not_active Expired - Lifetime
- 2003-10-07 ES ES03405716T patent/ES2259755T3/en not_active Expired - Lifetime
- 2003-10-07 AT AT03405716T patent/ATE319640T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE319640T1 (en) | 2006-03-15 |
| DE60303918D1 (en) | 2006-05-04 |
| DE60303918T2 (en) | 2006-10-19 |
| EP1522512A1 (en) | 2005-04-13 |
| ES2259755T3 (en) | 2006-10-16 |
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