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EP0340065B1 - Method and installation for piling sheets produced by a shear, particularly from a sheet-metal-strip - Google Patents

Method and installation for piling sheets produced by a shear, particularly from a sheet-metal-strip Download PDF

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Publication number
EP0340065B1
EP0340065B1 EP19890400997 EP89400997A EP0340065B1 EP 0340065 B1 EP0340065 B1 EP 0340065B1 EP 19890400997 EP19890400997 EP 19890400997 EP 89400997 A EP89400997 A EP 89400997A EP 0340065 B1 EP0340065 B1 EP 0340065B1
Authority
EP
European Patent Office
Prior art keywords
conveyor
blanks
stops
cutting machine
blank
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
Application number
EP19890400997
Other languages
German (de)
French (fr)
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EP0340065A1 (en
Inventor
Jacques Blondel
Joel Havez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DUJARDIN MONTBARD SOMENOR
Original Assignee
DUJARDIN MONTBARD SOMENOR
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.)
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Publication date
Application filed by DUJARDIN MONTBARD SOMENOR filed Critical DUJARDIN MONTBARD SOMENOR
Publication of EP0340065A1 publication Critical patent/EP0340065A1/en
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Anticipated expiration legal-status Critical
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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
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/16—Delivering or advancing articles from machines; Advancing articles to or into piles by contact of one face only with moving tapes, bands, or chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/20—Storage arrangements; Piling or unpiling
    • B21D43/22—Devices for piling sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/28—Associations of cutting devices therewith
    • 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
    • B65H29/26—Delivering or advancing articles from machines; Advancing articles to or into piles by dropping the articles
    • B65H29/30—Delivering or advancing articles from machines; Advancing articles to or into piles by dropping the articles from magnetic holders

Definitions

  • the present invention relates to installations for cutting blanks from a strip, in particular a sheet metal strip, by means of a shear or a press, and relates more particularly to the means for stacking these blanks with the output from the cutting machine.
  • the blanks leaving the cutting machine are brought to the stacking device either by gravity, by sliding on an inclined plane, or by means of a continuous conveyor, for example a magnetic belt conveyor which releases the blanks. in flight over the stacker.
  • the blanks are stopped by stops of the stacking device which allow, with lateral guides, to correctly position the blanks so that they can be stacked.
  • the friction of blanks on the conveyors and the shocks against the stops and guides may cause unacceptable damage.
  • Document DE-A-1 815 651 relates to such an installation for stacking sheets cut by shears. It describes a device comprising a first endless belt conveyor whose upper strand is located at the level of the shear table, and a second endless belt conveyor whose upstream end extends above half downstream of the first conveyor, so that its lower strand is at a short distance from the upper strand of the first conveyor and moves in the same direction, and which is provided with electromagnets allowing to plate the sheets under the lower strand and keep them there for transport to the stacking device.
  • the two conveyors have an intermittent operation, at the same rate as the shears, and their speed is equal to the speed of supply of the sheet to the shears.
  • the part of the second conveyor located above the stacking device is devoid of electromagnets or, if there are any, they are not powered; the sheets are projected onto the pile by the speed acquired and strike a stop. According to another operating mode, the second conveyor is in continuous operation.
  • the aim of the present invention is to reduce the friction of the blanks on the conveyors, guides and stops, to avoid scratches on the blanks and the deterioration of the belts and to suppress impacts against the guides and stops to avoid "stamping" on the blanks, which will achieve the "zero defect" objective or at least achieve a significant gain by avoiding retouching.
  • the invention also makes it possible to suppress the noise originating from the impacts of the blanks arriving at high speed in conventional inertia stackers, to increase staff safety and increase productivity thanks to the automatic adjustment of all parameters: rate, positions of guides and stops, etc. from an introduced "part code" by an operator.
  • the blanks are transported from the cutting machine to the stacking device by means of a cyclic conveyor whose rate is the same as that of the cutting machine and whose pitch is equal to one submultiple of the distance separating the cutting machine from the stacking device, and the blanks of the conveyor are transferred to the stacking device when the conveyor is stopped.
  • the pitch of the conveyor is determined as a function of the longitudinal dimension, measured in the direction of movement, of the blanks. The difference between the pitch and this dimension of the blanks corresponds to the spacing between two successive blanks on the conveyor.
  • said conveyor is switched on, at each cycle, before the device for feeding the cutting machine, the instant of starting of the conveyor and the variation as a function of time of its speed being chosen so that that the distance traveled by said conveyor when the blank leaving the cutting machine is loaded on the conveyor is equal to the desired spacing between the blanks.
  • the characteristics of the first part of the conveyor's walking cycle are chosen so that its speed is equal to that of the feeder of the cutting machine when the blank leaving the machine is taken over by the conveyor ; from this instant and until the end of the cycle the speeds of the conveyor and of the feeding device of the cutting machine are maintained equal.
  • an endless belt conveyor may be used, the ends of which extend, respectively, above the output table of the cutting machine and above the stacking device. and comprising electromagnetic or pneumatic means making it possible to press the blanks under the lower strand of the strip and to keep them there over the entire path of the conveyor, these means being able to be made inactive to allow the blanks to fall onto the stacking device.
  • the conveyor will be controlled by an automaton according to a program developed by a computer from data, entered by an operator, relating to the dimensions and the shape of the blanks and according to the cycle of the cutting machine.
  • the positioning of the guides and stops of the stacking device will be automated and controlled by the computer.
  • the conveyor is formed of two parallel bands placed side by side and whose head drums can be moved individually in the longitudinal direction, to adapt to a cutting plane of the cutting machine making an angle other than 90 ° with the direction of movement of the blanks.
  • FIGS. 1 and 2 The installation shown in FIGS. 1 and 2 consists essentially of an endless belt conveyor 10 and a stacking device 12.
  • the conveyor 10 comprises a chassis 14 which is mounted on horizontal slides allowing its movement longitudinal. These slides are fixed, on the one hand, to the frame of the cutting machine 16 and, on the other hand, to the chassis of the stacking device. The conveyor can be moved on these slides by means of screw jacks interposed between the chassis of the stacking device and the adjacent end of the chassis 14.
  • Two endless belts 18 are mounted side by side on the frame 14 and are stretched between head drums 20 and 22, the drum 20 adjacent to the stacking device being driven by a variable speed motor.
  • the lower strand of these bands which is horizontal, slides on the underside of non-magnetic stainless steel soles, above which magnets are placed.
  • the end of the conveyor overhangs the output table of the machine 16, the lower strands of the bands being a short distance from the table, so that the blanks leaving the machine are attracted by the magnets and pressed under the bands.
  • the magnets located in the first part of the conveyor, between the machine 16 and the stacking device can be permanent magnets or electromagnets. Above the stacking device, the conveyor is equipped with electromagnets which can be de-energized to drop the blanks on the stack being formed in the device.
  • the inside of the strips is smooth to facilitate sliding on the floors while their outside is striated to facilitate the fall of the blanks.
  • the head drum 22, adjacent to the machine 16, of at least one of the bands can be moved, by means of a jack, relative to the chassis of the conveyor, to modify the relative useful lengths of the two bands and allow better taking blanks whose front edge is biased (blanks in the shape of a triangle or trapezoid).
  • the stacking device comprises a raised frame 24 located below the conveyor 10, a short distance from the lower strand of the strips.
  • This frame carries front and rear stops 26 and 28 and lateral guides which are linked to the frame 24 by jacks making it possible to move them horizontally to adapt their positions to the dimensions of the blanks; these jacks also allow the stops 26 and 28 to be oriented in a horizontal plane.
  • the stacking device further comprises a lifting table 32 and two self-driving carriages 34 movable on rails 36 and each carrying a motorized roller tray 38 intended to receive the pallet 40.
  • the carriages are constituted by a frame on wheels with inside which the tray of the lifting table can pass so that it is possible to lift the tray 38 and the pallet which it carries, without lifting the carriage.
  • the carriages can be moved back and forth between the stacking device and two positions located on either side of it and for which the roller plates 38 are aligned with conveyors serving to bring the empty pallets and to evacuate the full pallets.
  • An indexing device is provided on the lifting table to correctly position the pallets according to the positions of the stops 26 and 28 and the lateral guides. A rotation of the pallet is also possible to obtain different positions of the blanks on the latter.
  • the machine 16 is equipped with a conventional feeding device bringing a sheet metal strip step by step under the tool of the machine, the advance being made between two cuts, at a predetermined rate.
  • the operation of the conveyor 10 is cyclical and its period is the same as that of the device for feeding the sheet metal to the machine 16. It is controlled by an automaton 42 according to a program preset by a computer 44 as a function of the dimensions of the blanks 30 and of the operating cycle of the device for supplying the sheets to the machine 16. Before the machine 16 starts, the computer 44 also determines, as a function of the same parameters, the positions of the stops 26 and 28 and of the lateral guides and control moving them to bring them into these positions.
  • Figure 3 shows the variations over time speeds of the device for feeding the sheet metal to the machine 16 (upper curve) and of the conveyor 10 (lower curve).
  • one of the objects of the invention is to be able to drop the blanks above the stacking device with zero speed so as to avoid impacts against the stops.
  • the pitch of the conveyor 10 is a submultiple of the distance separating the machine 16 from the stacking device or more precisely the distance between the front stop 26 of the stacking device and the front edge of the last blank out of the machine 16.
  • This pitch as well as the position of the stops 26 and 28 are determined by the computer 44 as a function of the length of the blanks. It is greater than the pitch of the device for feeding the sheet metal to the machine 16, which means that the blanks will be spaced apart longitudinally from one another on the conveyor.
  • the conveyor 10 starts (instant A) before the device for feeding the sheet metal to the machine 16, either at the end of cutting as in the example in FIG. 3, or with a certain delay .
  • the speed of the conveyor increases to the value V1 with a constant acceleration equal to that of the feeding device.
  • V1 is the speed of the feed device when the blank leaving the machine 16 is gripped by the transporter. The blank cannot be entered by the transporter only after it has been pushed a certain distance out of the machine by the feeding device; it is then driven by speed V1.
  • the speed of the conveyor 10 is then kept constant until the supply device reaches speed V1 (instant B), so that the blank and the conveyor have the same speed when the first is taken over by the second. From this moment, the conveyor 10 and the feed device move in synchronism until the stop. Before the conveyor 10 has completely stopped, the electromagnets placed above the stacking device are de-energized so that, given their hysteresis, the force of attraction exerted on the blank is canceled out when it is located above this device. The blank is then perfectly centered relative to the stops 26 and 28 and its speed is zero so that it falls on the stack supported by the pallet without hitting the stops.
  • the computer 44 also controls, via a programmable controller, the movements of the lifting table 32 and the carriages 34 of the stacking device.
  • the speed of the conveyor 10 is measured by means of two pulse generators placed, respectively, on the motor drum 20 and on an idler roller in contact with the strips; by comparing the indications of the two generators, we can detect the sliding of the bands on the drum and correct the speed of the conveyor to maintain a constant pitch.
  • the conveyor 10 and the cutting machine 16 are arranged in line.
  • the conveyor could however form any angle with the direction of travel of the sheet metal strip in the cutting machine, which could be equipped with a blank removal device.
  • the conveyor could be formed of several elements arranged in line or forming between them any angle.
  • a pneumatic system may be used to apply the blanks to the conveyor belts which must be permeable.
  • Other types of known carriers could moreover be used for the implementation of the invention. It is understood that these modifications are within the scope of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Pile Receivers (AREA)
  • Discharge By Other Means (AREA)
  • Making Paper Articles (AREA)

Description

La présente invention concerne les installations de découpage de flans à partir d'une bande, notamment d'une bande de tôle, au moyen d'une cisaille ou d'une presse, et a trait plus particulièrement aux moyens pour empiler ces flans à la sortie de la machine de découpage.The present invention relates to installations for cutting blanks from a strip, in particular a sheet metal strip, by means of a shear or a press, and relates more particularly to the means for stacking these blanks with the output from the cutting machine.

Actuellement, les flans sortant de la machine de découpage sont amenés au dispositif d'empilage soit par gravité, en glissant sur un plan incliné, soit au moyen d'un transporteur à marche continue, par exemple un transporteur à bande magnétique qui lâche les flans au vol au-dessus du dispositif d'empilage. Dans tous les cas, les flans sont arrêtés par des butées du dispositif d'empilage qui permettent, avec des guides latéraux, de positionner correctement les flans de façon à pouvoir les empiler. Les frottements de flans sur les transporteurs et les chocs contre les butées et les guides risquent de provoquer des détériorations inacceptables.Currently, the blanks leaving the cutting machine are brought to the stacking device either by gravity, by sliding on an inclined plane, or by means of a continuous conveyor, for example a magnetic belt conveyor which releases the blanks. in flight over the stacker. In all cases, the blanks are stopped by stops of the stacking device which allow, with lateral guides, to correctly position the blanks so that they can be stacked. The friction of blanks on the conveyors and the shocks against the stops and guides may cause unacceptable damage.

Le document DE-A-1 815 651 a pour objet une telle installation pour l'empilage de tôles découpées par une cisaille. On y décrit un dispositif comportant un premier transporteur à bande sans fin dont le brin supérieur est situé au niveau de la table de la cisaille, et un second transporteur à bande sans fin dont l'extrémité amont s'étend au-dessus de la moitié aval du premier transporteur, de telle sorte que son brin inférieur se trouve à faible distance du brin supérieur du premier transporteur et se déplace dans la même direction, et qui est muni d'électro-aimants permettant de plaquer les tôles sous le brin inférieur et de les y maintenir pour les transporter jusqu'au dispositif d'empilage. Suivant l'un des deux modes de fonctionnement décrit, les deux transporteurs ont une marche intermittente, à la même cadence que la cisaille, et leur vitesse est égale à la vitesse d'amenée de la tôle à la cisaille. La partie du second transporteur située au-dessus du dispositif d'empilage est dépourvue d'électro-aimants ou, s'il y en a, ils ne sont pas alimentés; les tôles sont projetées sur la pile par la vitesse acquise et viennent heurter une butée. Suivant un autre mode de fonctionnement, le second transporteur est à marche continue.Document DE-A-1 815 651 relates to such an installation for stacking sheets cut by shears. It describes a device comprising a first endless belt conveyor whose upper strand is located at the level of the shear table, and a second endless belt conveyor whose upstream end extends above half downstream of the first conveyor, so that its lower strand is at a short distance from the upper strand of the first conveyor and moves in the same direction, and which is provided with electromagnets allowing to plate the sheets under the lower strand and keep them there for transport to the stacking device. According to one of the two operating modes described, the two conveyors have an intermittent operation, at the same rate as the shears, and their speed is equal to the speed of supply of the sheet to the shears. The part of the second conveyor located above the stacking device is devoid of electromagnets or, if there are any, they are not powered; the sheets are projected onto the pile by the speed acquired and strike a stop. According to another operating mode, the second conveyor is in continuous operation.

Le but de la présenta invention est de réduira les frottements des flans sur las transporteurs, guides et butées, gour éviter les griffures sur les.flans et la détérioration des courroies et de supprimer les chocs contra les guides et butées pour éviter les "emboutis" sur les flans, ce qui permet d'atteindra l'objectif "zero défaut" ou au moins de réaliser un gain important en évitant les retouches. L'invention permet aussi de supprimer le bruit provenant des chocs des flans arrivant à grande vitesse dans les empileurs classiques à inertie, d'augmenter la sécurité du personnel et d'accroître la productivité grâce au réglage automatique de tous les paramètres : cadence, positions des guides et butées, etc à partir d'un "code pièce" introduit par un opérateur. Conformément à l'invention, on transporte les flans de la machine de découpage au dispositif d'empilage au moyen d'un transporteur à marche cyclique dont la cadence est la même que celle de la machine de découpage et dont le pas est égal à un sous-multiple de la distance séparant la machine de découpage du dispositif d'empilage, et on transfère les flans du transporteur au dispositif d'empilage lorsque le transporteur est à l'arrêt. Le pas du transporteur est déterminé en fonction de la dimension longitudinale, mesurée dans le sens du déplacement, des flans. La différence entre le pas et cette dimension des flans correspond à l'écartement entre deux flans successifs sur le transporteur. Pour obtenir cet écartement, on met en marche, à chaque cycle, ledit transporteur avant le dispositif d'alimentation de la machine de découpage, l'instant du démarrage du transporteur et la variation en fonction du temps de sa vitesse étant choisis de telle sorte que la distance parcourue par ledit transporteur lorsque le flan sortant de la machine de découpage est chargé sur le transporteur soit égale à l'écartement voulu entre les flans. Par ailleurs, dans le cas où le transporteur et la bande de tôle se déplacent dans la même direction, les caractéristiques de la première partie du cycle de marche du transporteur sont choisies pour que sa vitesse soit égale à celle du dispositif d'alimentation de la machine de découpage au moment où le flan sortant de la machine est pris en charge par le transporteur; à partir de cet instant et jusqu'à la fin du cycle les vitesses du transporteur et du dispositif d'alimentation de la machine de découpage sont maintenues égales. On pourra comparer les vitesses du flan et du transporteur, juste avant la prise en charge par le transporteur et corriger si nécessaire la vitesse du transporteur.The aim of the present invention is to reduce the friction of the blanks on the conveyors, guides and stops, to avoid scratches on the blanks and the deterioration of the belts and to suppress impacts against the guides and stops to avoid "stamping" on the blanks, which will achieve the "zero defect" objective or at least achieve a significant gain by avoiding retouching. The invention also makes it possible to suppress the noise originating from the impacts of the blanks arriving at high speed in conventional inertia stackers, to increase staff safety and increase productivity thanks to the automatic adjustment of all parameters: rate, positions of guides and stops, etc. from an introduced "part code" by an operator. According to the invention, the blanks are transported from the cutting machine to the stacking device by means of a cyclic conveyor whose rate is the same as that of the cutting machine and whose pitch is equal to one submultiple of the distance separating the cutting machine from the stacking device, and the blanks of the conveyor are transferred to the stacking device when the conveyor is stopped. The pitch of the conveyor is determined as a function of the longitudinal dimension, measured in the direction of movement, of the blanks. The difference between the pitch and this dimension of the blanks corresponds to the spacing between two successive blanks on the conveyor. To obtain this spacing, said conveyor is switched on, at each cycle, before the device for feeding the cutting machine, the instant of starting of the conveyor and the variation as a function of time of its speed being chosen so that that the distance traveled by said conveyor when the blank leaving the cutting machine is loaded on the conveyor is equal to the desired spacing between the blanks. In addition, in the case where the conveyor and the sheet metal strip move in the same direction, the characteristics of the first part of the conveyor's walking cycle are chosen so that its speed is equal to that of the feeder of the cutting machine when the blank leaving the machine is taken over by the conveyor ; from this instant and until the end of the cycle the speeds of the conveyor and of the feeding device of the cutting machine are maintained equal. We can compare the speeds of the blank and the conveyor, just before the assumption by the conveyor and correct if necessary the speed of the conveyor.

Pour la mise en oeuvre de l'invention, on pourra utiliser un transporteur à bande sans fin dont les extrémités s'étendent, respectivement, au-dessus de la table de sortie de la machine de découpage et au-dessus du dispositif d'empilage et comportant des moyens électromagnétiques ou pneumatiques permettant de plaquer les flans sous le brin inférieur de la bande et de les y maintenir sur tout le trajet du transporteur, ces moyens pouvant être rendus inactifs pour permettre la chute des flans sur le dispositif d'empilage.
Le transporteur sera commandé par un automate suivant un programme élaboré par un calculateur à partir des données, entrées par un opérateur, relatives aux dimensions et à la forme des flans et en fonction du cycle de la machine de découpage.For the implementation of the invention, an endless belt conveyor may be used, the ends of which extend, respectively, above the output table of the cutting machine and above the stacking device. and comprising electromagnetic or pneumatic means making it possible to press the blanks under the lower strand of the strip and to keep them there over the entire path of the conveyor, these means being able to be made inactive to allow the blanks to fall onto the stacking device.
The conveyor will be controlled by an automaton according to a program developed by a computer from data, entered by an operator, relating to the dimensions and the shape of the blanks and according to the cycle of the cutting machine.

De préférence, le positionnement des guides et butées du dispositif d'empilage sera automatisé et commandé par le calculateur.Preferably, the positioning of the guides and stops of the stacking device will be automated and controlled by the computer.

Suivant un mode de réalisation préféré, le transporteur est formé de deux bandes parallèles placées côte-à-côte et dont les tambours de têtes peuvent être déplacés individuellement dans le sens longitudinal, pour s'adapter à un plan de coupe de la machine de découpage faisant un angle différent de 90° avec la direction de déplacement des flans.According to a preferred embodiment, the conveyor is formed of two parallel bands placed side by side and whose head drums can be moved individually in the longitudinal direction, to adapt to a cutting plane of the cutting machine making an angle other than 90 ° with the direction of movement of the blanks.

D'autres caractéristiques de l'invention apparaîtront à la lecture de la description qui suit et se réfère aux dessins l'accompagnant qui montrent, à titre d'exemple non limitatif, un mode de réalisation de l'invention et sur lesquels :

  • La figure 1 est une vue en élévation d'une installation pour la mise en oeuvre de l'invention;
  • La figure 2 est une vue de dessus de l'installation;
  • La figure 3 est le diagramme des vitesses du dispositif d'alimentation de la machine de découpage et du transporteur d'évacuation des flans; et
  • La figure 4 est le schéma de l'installation.
Other characteristics of the invention will appear on reading the description which follows and refers to the accompanying drawings which show, by way of nonlimiting example, an embodiment of the invention and in which:
  • Figure 1 is an elevational view of an installation for the implementation of the invention;
  • Figure 2 is a top view of the installation;
  • FIG. 3 is a diagram of the speeds of the device for feeding the cutting machine and the blank discharge conveyor; and
  • Figure 4 is the diagram of the installation.

L'installation représentée sur les figures 1 et 2 est constituée essentiellement par un transporteur à bandes sans fin 10 et un dispositif d'empilage 12.The installation shown in FIGS. 1 and 2 consists essentially of an endless belt conveyor 10 and a stacking device 12.

Le transporteur 10 comporte un châssis 14 qui est monté sur des glissières horizontales permettant son déplacement longitudinal. Ces glissières sont fixées, d'une part, sur le bâti de la machine de découpage 16 et, d'autre part, sur le châssis du dispositif d'empilage. Le transporteur peut être déplacé sur ces glissières au moyens de vérins à vis interposés entre le châssis du dispositif d'empilage et l'extrémité adjacente du châssis 14.The conveyor 10 comprises a chassis 14 which is mounted on horizontal slides allowing its movement longitudinal. These slides are fixed, on the one hand, to the frame of the cutting machine 16 and, on the other hand, to the chassis of the stacking device. The conveyor can be moved on these slides by means of screw jacks interposed between the chassis of the stacking device and the adjacent end of the chassis 14.

Deux bandes sans fin 18 sont montées côte-à-côte sur le châssis 14 et sont tendues entre des tambours de tête 20 et 22, le tambour 20 adjacent au dispositif d'empilage étant entraîné par un moteur à vitesse variable. Le brin inférieur de ces bandes, qui est horizontal, glisse sur la face inférieure de soles en acier inoxydable, amagnétique, au-dessus desquelles sont placés des aimants. L'extrémité du transporteur surplombe la table de sortie de la machine 16, les brins inférieurs des bandes se trouvant à faible distance de la table, de telle sorte que les flans sortant de la machine soient attirées par les aimants et plaqués sous les bandes. Les aimants se trouvant dans la première partie du transporteur, entre la machine 16 et le dispositif d'empilage, peuvent être des aimants permanents ou des électro-aimants. Au-dessus du dispositif d'empilage, le transporteur est équipé d'électro-aimants qui peuvent être désexcités pour laisser tomber les flans sur la pile en formation dans le dispositif.Two endless belts 18 are mounted side by side on the frame 14 and are stretched between head drums 20 and 22, the drum 20 adjacent to the stacking device being driven by a variable speed motor. The lower strand of these bands, which is horizontal, slides on the underside of non-magnetic stainless steel soles, above which magnets are placed. The end of the conveyor overhangs the output table of the machine 16, the lower strands of the bands being a short distance from the table, so that the blanks leaving the machine are attracted by the magnets and pressed under the bands. The magnets located in the first part of the conveyor, between the machine 16 and the stacking device, can be permanent magnets or electromagnets. Above the stacking device, the conveyor is equipped with electromagnets which can be de-energized to drop the blanks on the stack being formed in the device.

La face intérieure des bandes est lisse pour faciliter le glissement sur les soles tandis que leur face extérieure est striée pour faciliter la chute des flans.The inside of the strips is smooth to facilitate sliding on the floors while their outside is striated to facilitate the fall of the blanks.

Le tambour de tête 22, adjacent à la machine 16, d'au moins une des bandes peut être déplacé, au moyen d'un vérin, par rapport au châssis du transporteur, pour modifier les longueurs utiles relatives des deux bandes et permettre une meilleure prise des flans dont le bord avant est en biais (flans en forme de triangle ou de trapèze).The head drum 22, adjacent to the machine 16, of at least one of the bands can be moved, by means of a jack, relative to the chassis of the conveyor, to modify the relative useful lengths of the two bands and allow better taking blanks whose front edge is biased (blanks in the shape of a triangle or trapezoid).

Le dispositif d'empilage comporte un cadre surélevé 24 situé au-dessous du transporteur 10, à faible distance du brin inférieur des bandes. Ce cadre porte des butées avant et arrière 26 et 28 et des guides latéraux qui sont liés au cadre 24 par des vérins permettant de les déplacer horizontalement pour adapter leurs positions aux dimensions des flans; ces vérins permettent aussi d'orienter les butées 26 et 28 dans un plan horizontal.The stacking device comprises a raised frame 24 located below the conveyor 10, a short distance from the lower strand of the strips. This frame carries front and rear stops 26 and 28 and lateral guides which are linked to the frame 24 by jacks making it possible to move them horizontally to adapt their positions to the dimensions of the blanks; these jacks also allow the stops 26 and 28 to be oriented in a horizontal plane.

Le dispositif d'empilage comporte en outre une table élévatrice 32 et deux chariots auto-moteurs 34 déplaçables sur des rails 36 et portant chacun un plateau à rouleaux motorisés 38 destiné à recevoir la palette 40. Les chariots sont constitués par un cadre sur roues à l'intérieur duquel peut passer le plateau de la table élévatrice de façon qu'il soit possible de soulever le plateau 38 et la palette qu'il porte, sans soulever le chariot. Les chariots sont déplaçables en va-et-vient entre le dispositif d'empilage et deux positions situées de part et d'autre de celui-ci et pour lesquelles le plateaux à rouleaux 38 sont alignés avec des transporteurs servant à amener les palettes vides et à évacuer les palettes pleines.The stacking device further comprises a lifting table 32 and two self-driving carriages 34 movable on rails 36 and each carrying a motorized roller tray 38 intended to receive the pallet 40. The carriages are constituted by a frame on wheels with inside which the tray of the lifting table can pass so that it is possible to lift the tray 38 and the pallet which it carries, without lifting the carriage. The carriages can be moved back and forth between the stacking device and two positions located on either side of it and for which the roller plates 38 are aligned with conveyors serving to bring the empty pallets and to evacuate the full pallets.

Un dispositif d'indexage est prévu sur la table élévatrice pour positionner correctement les palettes en fonction des positions des butées 26 et 28 et des guides latéraux. Une rotation de la palette est également possible pour obtenir différentes positions des flans sur cette dernière.An indexing device is provided on the lifting table to correctly position the pallets according to the positions of the stops 26 and 28 and the lateral guides. A rotation of the pallet is also possible to obtain different positions of the blanks on the latter.

La machine 16 est équipée d'un dispositif d'alimentation classique amenant pas-à-pas une bande de tôle sous l'outil de la machine, l'avance se faisant entre deux coupes, à une cadence prédéterminée.The machine 16 is equipped with a conventional feeding device bringing a sheet metal strip step by step under the tool of the machine, the advance being made between two cuts, at a predetermined rate.

Le fonctionnement du transporteur 10 est cyclique et sa période est la même que celle du dispositif d'amenée de la tôle à la machine 16. Il est commandé par un automate 42 suivant un programme préétabli par un calculateur 44 en fonction des dimensions des flans 30 et du cycle de fonctionnement du dispositif d'amenée des tôles à la machine 16. Avant le démarrage de la machine 16, le calculateur 44 détermine aussi, en fonction des mêmes paramètres, les positions des butées 26 et 28 et des guides latéraux et commande leur déplacement pour les amener dans ces positions.The operation of the conveyor 10 is cyclical and its period is the same as that of the device for feeding the sheet metal to the machine 16. It is controlled by an automaton 42 according to a program preset by a computer 44 as a function of the dimensions of the blanks 30 and of the operating cycle of the device for supplying the sheets to the machine 16. Before the machine 16 starts, the computer 44 also determines, as a function of the same parameters, the positions of the stops 26 and 28 and of the lateral guides and control moving them to bring them into these positions.

La figure 3 donne les variations en fonction du temps des vitesses du dispositif d'amenée de la tôle à la machine 16 (courbe supérieure) et du transporteur 10 (courbe inférieure).Figure 3 shows the variations over time speeds of the device for feeding the sheet metal to the machine 16 (upper curve) and of the conveyor 10 (lower curve).

Comme expliqué plus haut, l'un des buts de l'invention est de pouvoir lâcher les flans au-dessus du dispositif d'empilage avec une vitesse nulle de façon à éviter les chocs contre les butées. Pour cela, il est nécessaire que le pas du transporteur 10 soit un sous-multiple de la distance séparant la machine 16 du dispositif d'empilage ou plus précisément de la distance entre la butée avant 26 du dispositif d'empilage et le bord avant du dernier flan sorti de la machine 16. Ce pas ainsi que la position des butées 26 et 28 sont déterminés par le calculateur 44 en fonction de la longueur des flans. Il est supérieur au pas du dispositif d'amenée de la tôle à la machine 16, ce qui signifie que les flans seront espacés longitudinalement les uns des autres sur le transporteur.As explained above, one of the objects of the invention is to be able to drop the blanks above the stacking device with zero speed so as to avoid impacts against the stops. For this, it is necessary that the pitch of the conveyor 10 is a submultiple of the distance separating the machine 16 from the stacking device or more precisely the distance between the front stop 26 of the stacking device and the front edge of the last blank out of the machine 16. This pitch as well as the position of the stops 26 and 28 are determined by the computer 44 as a function of the length of the blanks. It is greater than the pitch of the device for feeding the sheet metal to the machine 16, which means that the blanks will be spaced apart longitudinally from one another on the conveyor.

Suivant le programme préétabli par le calculateur, le transporteur 10 démarre (instant A) avant le dispositif d'amenée de la tôle à la machine 16, soit en fin de coupe comme dans l'exemple de la figure 3, soit avec un certain retard. La vitesse du transporteur augmente jusqu'à la valeur V1 avec une accélération constant et égale à celle du dispositif d'amenée. V1 est la vitesse du dispositif d'amenée lorsque le flan sortant de la machine 16 est saisi par le transporteur. Le flan ne peut en effet être saisi par le transporteur qu'après qu'il ait été poussé sur une certaine distance hors de la machine par le dispositif d'amenée; il est alors animé de la vitesse V1.According to the program preestablished by the computer, the conveyor 10 starts (instant A) before the device for feeding the sheet metal to the machine 16, either at the end of cutting as in the example in FIG. 3, or with a certain delay . The speed of the conveyor increases to the value V1 with a constant acceleration equal to that of the feeding device. V1 is the speed of the feed device when the blank leaving the machine 16 is gripped by the transporter. The blank cannot be entered by the transporter only after it has been pushed a certain distance out of the machine by the feeding device; it is then driven by speed V1.

La vitesse du transporteur 10 est ensuite maintenue constante jusqu'à ce que le dispositif d'amenée atteigne la vitesse V1 (instant B), de telle sorte que le flan et le transporteur aient la même vitesse lorsque le premier est pris en charge par le second. A partir de ce moment là, le transporteur 10 et le dispositif d'amenée se déplacent en synchronisme jusqu'à l'arrêt. Avant l'arrêt complet du transporteur 10, les électro-aimants placés au-dessus du dispositif d'empilage sont desexcités de telle sorte que, compte tenu de leur hystérésis, la force d'attraction exercée sur le flan s'annule lorsqu'il se trouve au-dessus de ce dispositif. Le flan est alors parfaitement centré par rapport aux butées 26 et 28 et sa vitesse est nulle de sorte qu'il tombe sur la pile supportée par la palette sans heurter les butées.The speed of the conveyor 10 is then kept constant until the supply device reaches speed V1 (instant B), so that the blank and the conveyor have the same speed when the first is taken over by the second. From this moment, the conveyor 10 and the feed device move in synchronism until the stop. Before the conveyor 10 has completely stopped, the electromagnets placed above the stacking device are de-energized so that, given their hysteresis, the force of attraction exerted on the blank is canceled out when it is located above this device. The blank is then perfectly centered relative to the stops 26 and 28 and its speed is zero so that it falls on the stack supported by the pallet without hitting the stops.

Le calculateur 44 commande aussi, par l'intermédiaire d'un automate programmable, les mouvements de la table élévatrice 32 et des chariots 34 du dispositif d'empilage.The computer 44 also controls, via a programmable controller, the movements of the lifting table 32 and the carriages 34 of the stacking device.

La vitesse du transporteur 10 est mesurée au moyen de deux générateurs d'impulsions placés, respectivement, sur le tambour moteur 20 et sur un rouleau fou en contact avec les bandes; en comparant les indications des deux générateurs, on peut détecter le glissement des bandes sur le tambour et corriger la vitesse du transporteur pour conserver un pas constant.The speed of the conveyor 10 is measured by means of two pulse generators placed, respectively, on the motor drum 20 and on an idler roller in contact with the strips; by comparing the indications of the two generators, we can detect the sliding of the bands on the drum and correct the speed of the conveyor to maintain a constant pitch.

Dans l'exemple décrit ci-dessus, le transporteur 10 et la machine de découpage 16 sont disposés en ligne. Le transporteur pourrait cependant former un angle quelconque avec la direction de défilement de la bande de tôle dans la machine de découpage, qui pourrait être équipée d'un dispositif d'évacuation des flans. Le transporteur pourrait être formé de plusieurs éléments disposés en ligne ou formant entre eux un angle quelconque. Dans le cas de flans non magnétiques, par exemple en acier inoxydable ou en aluminium, on pourra utiliser un système pneumatique pour appliquer les flans sur les bandes du transporteur qui devront être perméables. D'autres types de transporteurs connus pourraient d'ailleurs être utilisés pour la mise en oeuvre de l'invention. Il est bien entendu que ces modifications entrent dans le cadre de la présente invention.In the example described above, the conveyor 10 and the cutting machine 16 are arranged in line. The conveyor could however form any angle with the direction of travel of the sheet metal strip in the cutting machine, which could be equipped with a blank removal device. The conveyor could be formed of several elements arranged in line or forming between them any angle. In the case of non-magnetic blanks, for example stainless steel or aluminum, a pneumatic system may be used to apply the blanks to the conveyor belts which must be permeable. Other types of known carriers could moreover be used for the implementation of the invention. It is understood that these modifications are within the scope of the present invention.

Claims (4)

  1. Installation for piling up blanks (30) at the discharge end of a cutting machine (16) and consisting of a piling device (12) equipped with a lifting table (32) and a front stop (26) which limit the area where the blanks (30) shall be piled up, and a cyclical-operation conveyor (10) the operating rate of which is equal to that of the feed device of the cutting machine (16), which starts before the feed device and which runs at the same speed (V1) as the latter when the blank (30) coming out of the cutting machine (16) is picked up by the conveyor, characterized in that it comprises also a rear stop (28), means (jacks) for adjusting the position of the said stops (26, 28), a variable-speed motor for driving the said conveyor (10), means (44) for determining the pitch of conveyor (10) and the position of the stops (26, 28) according to the dimensions of the blanks (30) so that this pitch be equal to a submultiple of the distance between the front stop (26) and the front edge of the last blank (30) discharged from the cutting machine (16), and means (42) capable of controlling the means for adjusting the stops (26, 28), and of controlling the motor of the conveyor (10) so as to ensure synchronization between the movement of the conveyor (10) and the cutting machine (16) feed device from the moment when the blank (30) coming out of the cutting machine (16) is picked up by the conveyor 10) till the said feed device stops, so that whenever the conveyor (10) stops a blank (30) is situated above the piling device (12), just above the area delimited by the said stops (26, 28).
  2. Installation according to claim 1, characterized in that the said conveyor (10) is an endless-belt conveyor fitted with electromagnetic means (27) or pneumatic means enabling to stick the blanks(30) under the return strand of the belt (18) and to maintain them along the whole travel of the conveyor (10), which means can be deactivated in order to allow the blanks (30) to fall on the piling device (12).
  3. Installation according to claim 2, characterized in that the said conveyor (10) includes two parallel belts placed side by side and the head pulleys of which can be moved longitudinally, with respect to each other, to fit the shape of the blanks (30).
  4. Installation according to claim 1, 2 or 3, characterized in that the said conveyor (10) is mounted on slides allowing it to move longitudinally.
EP19890400997 1988-04-27 1989-04-12 Method and installation for piling sheets produced by a shear, particularly from a sheet-metal-strip Expired - Lifetime EP0340065B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8805599A FR2630669B1 (en) 1988-04-27 1988-04-27 METHOD AND INSTALLATION FOR STACKING SHEETS PRODUCED BY A CUTTING MACHINE, PARTICULARLY FROM A SHEET OF SHEET
FR8805599 1988-04-27

Publications (2)

Publication Number Publication Date
EP0340065A1 EP0340065A1 (en) 1989-11-02
EP0340065B1 true EP0340065B1 (en) 1993-03-31

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EP19890400997 Expired - Lifetime EP0340065B1 (en) 1988-04-27 1989-04-12 Method and installation for piling sheets produced by a shear, particularly from a sheet-metal-strip

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EP (1) EP0340065B1 (en)
DE (1) DE68905648T2 (en)
ES (1) ES2039889T3 (en)
FR (1) FR2630669B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2690637A1 (en) * 1992-04-29 1993-11-05 Dujardin Montbard Somenor Handling installation for transporting blanks from a cutting machine to a stacking device.
NL9200883A (en) * 1992-05-20 1993-12-16 Walker Hagou Bv METHOD FOR CUTTING AND STACKING METAL SHEETS
CN113878052B (en) * 2021-09-28 2023-06-20 河南永通铝业有限公司 Automatic punching device for round aluminum plate with automatic feeding mechanism
CN119427720B (en) * 2025-01-08 2025-04-04 森冕新材料科技(成都)有限公司 Packaging material surface forming mechanism

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1815651A1 (en) * 1968-12-19 1970-07-09 Siemag Maschinen U Stahlbau Ne Device for stacking metal sheets on a lifting table
DE3151208C2 (en) * 1981-12-23 1986-11-27 Siemens AG, 1000 Berlin und 8000 München Device for removing ferromagnetic sheet metal blanks from sheet metal processing machines

Also Published As

Publication number Publication date
FR2630669B1 (en) 1993-01-22
DE68905648T2 (en) 1993-07-29
ES2039889T3 (en) 1993-10-01
FR2630669A1 (en) 1989-11-03
DE68905648D1 (en) 1993-05-06
EP0340065A1 (en) 1989-11-02

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