EP1170228A2 - Device for controlling the means for feeding sheets in a machine - Google Patents

Device for controlling the means for feeding sheets in a machine Download PDF

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Publication number
EP1170228A2
EP1170228A2 EP01110578A EP01110578A EP1170228A2 EP 1170228 A2 EP1170228 A2 EP 1170228A2 EP 01110578 A EP01110578 A EP 01110578A EP 01110578 A EP01110578 A EP 01110578A EP 1170228 A2 EP1170228 A2 EP 1170228A2
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EP
European Patent Office
Prior art keywords
stack
level
computer
sheets
detector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01110578A
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German (de)
French (fr)
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EP1170228A3 (en
EP1170228B1 (en
Inventor
Jean-Claude Rebaud
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Bobst Mex SA
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Bobst SA
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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
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/08—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device
    • B65H1/18—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device controlled by height of pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/08—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device
    • B65H1/14—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device comprising positively-acting mechanical devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/13—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/15—Height, e.g. of stack
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/30—Numbers, e.g. of windings or rotations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/20—Calculating means; Controlling methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/30—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof
    • B65H2557/32—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof for modulating frequency or amplitude
    • 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
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S414/00—Material or article handling
    • Y10S414/10—Associated with forming or dispersing groups of intersupporting articles, e.g. stacking patterns
    • Y10S414/102—Associated with forming or dispersing groups of intersupporting articles, e.g. stacking patterns including support for group
    • Y10S414/103—Vertically shiftable
    • Y10S414/105—Shifted by article responsive means

Definitions

  • the present invention relates to a servo device organs delivering sheets from a stack to a machine working.
  • a device described in CH 651 807 comprising a lifting mechanism said stack, a sheet introducing member provided with a gripping, means for detecting the upper level of said stack comprising a detector of the front level of said battery connected to a computer acting on an electric motor of said lifting mechanism of said stack and means for raising said stack according to said level superior.
  • a command to raise this battery is sent to the motor drive which drives the stack elevating mechanism by impulse.
  • the duration of the pulse is modulated to obtain steps of rise of variable size, allowing to bring back the top surface of the stack at the same level consecutively at the start of each sheet of this stack.
  • the object of the present invention is to remedy, at least in part to this disadvantage.
  • the subject of this invention is a device for controlling the organs delivering sheets from a stack, to a machine working them, as defined by claim 1.
  • the feeding station represented by figure 1 is of the type of that described in CH 651 807 to which reference may be made for more details. It includes a stack elevator with a lifting grid 1 suspended from chains 2. One end of each chain 2 is attached to the lifting grid 1 by means of legs 3 at least minus two, preferably four, placed on either side of the stack sheet feed 4. Each chain 2 is connected to its other end, to a fastening piece crossed by a screw. Each chain 2 passes around a chain wheel 7 mounted on shafts 8.
  • a device ensures the vertical drive of the lifting grid 1 by the chains 2. This device may be constituted by the attachment piece which is of course guided during its movement along the screw by slides (not shown). The opinion is supported by two bearings (not shown) and driven by a motor reduction gear 11 fitted with an encoder 41. It is obvious that any motor-reduction device capable of generating the rotation of the shaft 8 secured to the wheels chains 7 can be used.
  • the introduction station also includes a fixed suction group 12 on a frame 13 suspended from the end of at least one, in this case at least two chains 14 via fixing lugs 15.
  • the other end of the chains 14 is fixed to the output axis of a linear motor 18.
  • One end of the frame 13 rests so that it can slide on a spacer 24 while the other is fitted with a guide arranged in the supports 27 fixed on each of the lateral uprights 28 of frames 47, 48 of the feeding station. This provision ensures an unchanged position of the suction group 12 relative to the rear edge of the stack of sheets 4, when it goes up or down under the action of the motor 18.
  • the suction unit 12 includes several suction cups 29 (only one has been shown to simplify the drawing), as well as a first detector member 30 which will be described in more detail below. It is specified that the sucking group 12 is only described to understand how sheet feeding is done but that this known sucking group 12 is not part of the present invention and will not be described here in all its details.
  • the first detector member 30, which includes a crowbar 19 and a reading cell 20, is placed in the vicinity of the upper part back of the stack of sheets 4 on a theoretical axis corresponding to the axis theoretical median of the stack of sheets 4.
  • a second detector member 32 is placed in front of the upper front part of the stack of sheets 4 on the axis median of this stack.
  • This second detector member 32 consists of preferably by a fixed linear camera arranged in the height direction of the stack of sheets 4, so as to provide an analog signal depending on the level measured.
  • a retractable front stop 33 is pivotally mounted around a axis 34, near the upper level of the front face of the stack of sheets 4.
  • the pivoting movement of the front stop 33 is obtained using a lever 35 controlled by a cam 36, actuated by the drive device of the introduction station fed by the sheets of stack 4.
  • This stop 33 has a window (not shown) centered on the median axis of the stack of sheets 4, to allow the detector 32 to constantly see the level top of this stack 4.
  • the first detector member 30 is electrically connected to one circuits of a computer 37 by a cable 38, while the second member detector 32 is connected to a second circuit of this same computer 37 using of a cable 39.
  • the computer 37 receives a signal from the first detector organ 30, it transmits positive or negative sense information intended to be transmitted by the cable 40 to the motor 18 governing the vertical movement of the sucking group 12.
  • the analog signal supplied to the computer by the second detector 32 allows the latter to evaluate in real time the difference between the upper level of the stack, measured by the second detector 32 and the upper reference level of this stack.
  • This comparison between these two levels allows to form a speed signal at the output of the computer which will be compared to the real-time speed of the reduction motor 11 provided by a encoder 41 associated with this motor.
  • the result of the comparison between these two speed signals is used to change the frequency more or less power supply to the motor through a frequency converter 42 connected to this reduction motor 11.
  • the reduction motor 11 raises the stack of sheets 4 continuously with a speed constantly adapted to the actual level of the stack compared to the reference level.
  • the introduction station can also also include a auxiliary supply device 50, commonly called non-stop (NS), allowing to change the battery without interrupting the flow of leaf.
  • This auxiliary supply device 50 is composed of a frame 51 allowing the establishment of bars 52 supporting the stack when the grid 1 main battery rise reached a level requiring recharging of a new stack of leaves.
  • the introduction of these bars 52 under the main stack allows to form an auxiliary grid while supporting the stack main so that we can lower the grid 1 in position low allowing charging of the new battery.
  • This non-stop device is generally equipped with a drive having a kinematics similar to that of the rise of grid 1, and it comprises inter alia a gear motor 53 intended to drive wheels with chain 54 around which the chains 55 ensure movement vertical of the frame 51.
  • the gear motor 53 is also connected to the computer 37.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Pile Receivers (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Abstract

A device for controlling delivery of sheets from a stack includes a lift for a stack of sheets. A sheet inserter removes sheets from the top of the stack to move them. A detector detects the front top level of the stack and measures the extent of variations in the level of the stack. A computer receives a measurement from the detector and acts on a first electric motor for the lift to raise the stack. A source of information connected to the computer relates to the supply frequency in real time and to the nominal thickness of the sheets. The computer output is connecting to a sheet supply frequency varying device for controlling the first motor to the lift. The computer is programmed so that the signal at its output is characteristic of the difference between the measured level of the stack and the calculated level thereof. An auxiliary supply device may support and raise the stack, based on the computer program, independently of the lift.

Description

La présente invention se rapporte à un dispositif d'asservissement des organes délivrant des feuilles à partir d'une pile, à une machine les travaillant.The present invention relates to a servo device organs delivering sheets from a stack to a machine working.

L'opération qui consiste à prélever successivement la feuille supérieure d'une pile de feuilles pour former une nappe de feuilles en vue de les introduire dans une machine d'impression ou de découpage est bien connue et de nombreux dispositifs réalisant cette fonction existent. Dans le cas de l'alimentation feuille à feuille de carton compact ou ondulé, on est fréquemment confronté à des problèmes de planéité, de sorte que la surface supérieure de la pile peut présenter des différences de niveau notables. Ceci est dû au fait que l'épaisseur d'une feuille de carton est susceptible de varier en fonction de plusieurs facteurs externes, tels que l'humidité ambiante, les conditions de stockage, etc., de sorte que l'on constate une différence de hauteur entre l'avant et l'arrière de la pile, de même qu'entre le centre et les bords de cette pile.The operation which consists in successively removing the sheet top of a pile of leaves to form a sheet of leaves for introducing them into a printing or cutting machine is fine known and many devices performing this function exist. In the case from sheet to sheet feeding of compact or corrugated cardboard, frequently faced with problems of flatness, so that the surface top of the stack may have significant differences in level. This is due to the fact that the thickness of a sheet of cardboard may vary based on several external factors, such as ambient humidity, storage conditions, etc., so that there is a difference in height between the front and back of the stack, as well as between the center and the edges of this stack.

On a déjà proposé de remédier à cet inconvénient grâce à un dispositif décrit dans le CH 651 807, comprenant un mécanisme élévateur de ladite pile, un organe d'introduction de feuille muni d'un élément de préhension, des moyens de détection du niveau supérieur de ladite pile comprenant un détecteur du niveau avant de ladite pile connecté à un calculateur agissant sur un moteur électrique dudit mécanisme élévateur de ladite pile et des moyens pour faire monter ladite pile en fonction dudit niveau supérieur. Lorsque le détecteur de niveau avant ne voit plus la pile de feuilles, une impulsion de commande de montée de cette pile est envoyée au moteur d'entraínement qui entraíne le mécanisme élévateur de la pile par impulsion. Selon l'épaisseur des feuilles empilées, la durée de l'impulsion est modulée pour obtenir des pas de montée de grandeur variable, permettant de ramener la surface supérieure de la pile au même niveau consécutivement au départ de chaque feuille de cette pile.It has already been proposed to remedy this drawback by means of a device described in CH 651 807, comprising a lifting mechanism said stack, a sheet introducing member provided with a gripping, means for detecting the upper level of said stack comprising a detector of the front level of said battery connected to a computer acting on an electric motor of said lifting mechanism of said stack and means for raising said stack according to said level superior. When the front level sensor no longer sees the stack of sheets, a command to raise this battery is sent to the motor drive which drives the stack elevating mechanism by impulse. Depending on the thickness of the stacked sheets, the duration of the pulse is modulated to obtain steps of rise of variable size, allowing to bring back the top surface of the stack at the same level consecutively at the start of each sheet of this stack.

Si un tel dispositif permet d'améliorer sensiblement la précision du niveau supérieur de la pile et en particulier celui de la face verticale avant, il n'en demeure pas moins que la montée de la pile de feuilles par impulsions présente l'inconvénient que le moindre décalage dans les impulsions successives peut entraíner une variation dans le pas de la nappe de feuilles ainsi formée. Or, au-delà d'une certaine tolérance de ce pas, la machine qui traite la nappe de feuilles s'arrête, nécessitant une remise en marche entraínant une perte de production substantielle.If such a device significantly improves the accuracy of the upper level of the stack and in particular that of the front vertical face, it the fact remains that the rise of the stack of sheets by pulses has the disadvantage that the slightest shift in the pulses successive can cause a variation in the pitch of the sheet of leaves thus formed. However, beyond a certain tolerance of this step, the machine which treats the sheet of leaves stops, requiring a restart resulting in a substantial loss of production.

Le but de la présente invention est de remédier, au moins en partie à cet inconvénient.The object of the present invention is to remedy, at least in part to this disadvantage.

A cet effet, cette invention a pour objet un dispositif d'asservissement des organes délivrant des feuilles à partir d'une pile, à une machine les travaillant, tel que défini par la revendication 1.To this end, the subject of this invention is a device for controlling the organs delivering sheets from a stack, to a machine working them, as defined by claim 1.

Le dessin annexé illustre, schématiquement et à titre d'exemple, une forme d'exécution du dispositif d'asservissement objet de cette invention.

  • La figure 1 est une vue de profil d'un poste d'alimentation en feuilles;
  • la figure 2 est un schéma bloc de la commande du mécanisme pour faire monter la pile d'alimentation en feuilles.
The attached drawing illustrates, schematically and by way of example, an embodiment of the servo device object of this invention.
  • Figure 1 is a side view of a sheet feed station;
  • Figure 2 is a block diagram of the mechanism control for mounting the sheet feed stack.

Le poste d'alimentation représenté par la figure 1 est du type de celui décrit dans le CH 651 807 auquel on pourra se référer pour plus de détails. Il comprend un élévateur de pile comportant une grille de levage 1 suspendue à des chaínes 2. L'une des extrémités de chaque chaíne 2 est attachée à la grille de levage 1 par l'intermédiaire de pattes 3 au nombre d'au moins deux, préférentiellement quatre, placées de part et d'autre de la pile d'alimentation en feuilles 4. Chaque chaíne 2 est connectée, à son autre extrémité, à une pièce d'attache traversée par une vis. Chaque chaíne 2 passe autour d'une roue à chaíne 7 montée sur des arbres 8. Un dispositif assure l'entraínement vertical de la grille de levage 1 par les chaínes 2. Ce dispositif peut-être constitué par la pièce d'attache qui est bien entendu guidée lors de son déplacement le long de la vis par des coulisses (non représentées). La vis est supportée par deux paliers (non représentés) et entraínée par un moteur réducteur 11 équipé d'un codeur 41. Il est évident que tout dispositif moto-réducteur capable de générer la rotation de l'arbre 8 solidaire des roues à chaínes 7 peut être utilisé.The feeding station represented by figure 1 is of the type of that described in CH 651 807 to which reference may be made for more details. It includes a stack elevator with a lifting grid 1 suspended from chains 2. One end of each chain 2 is attached to the lifting grid 1 by means of legs 3 at least minus two, preferably four, placed on either side of the stack sheet feed 4. Each chain 2 is connected to its other end, to a fastening piece crossed by a screw. Each chain 2 passes around a chain wheel 7 mounted on shafts 8. A device ensures the vertical drive of the lifting grid 1 by the chains 2. This device may be constituted by the attachment piece which is of course guided during its movement along the screw by slides (not shown). The opinion is supported by two bearings (not shown) and driven by a motor reduction gear 11 fitted with an encoder 41. It is obvious that any motor-reduction device capable of generating the rotation of the shaft 8 secured to the wheels chains 7 can be used.

La station d'introduction comprend aussi un groupe suceur 12 fixé sur un châssis 13 suspendu à l'extrémité d'au moins une, dans le cas présent d'au moins deux chaínes 14 par l'intermédiaire de pattes de fixation 15. L'autre extrémité des chaínes 14 est fixée à l'axe de sortie d'un moteur linéaire 18. La ou les chaínes 14 passent autour des roues à chaínes 22 montées sur un arbre transversal 23. L'une des extrémités du châssis 13 repose de façon à pouvoir glisser sur une entretoise 24 alors que l'autre est munie d'un dispositif de guidage aménagé dans les supports 27 fixés sur chacun des montants latéraux 28 des bâtis 47, 48 du poste d'alimentation. Cette disposition permet d'assurer une position inchangée du groupe suceur 12 par rapport au bord arrière de la pile de feuilles 4, lorsqu'il monte ou qu'il descend sous l'action du moteur 18. Le groupe suceur 12 comprend plusieurs ventouses 29 (une seule a été représentée pour simplifier le dessin), ainsi qu'un premier organe détecteur 30 qui sera décrit plus en détail ci-après. Il est précisé que le groupe suceur 12 n'est décrit que pour comprendre comment s'effectue l'alimentation en feuilles de la machine, mais que ce groupe suceur 12 connu ne fait pas partie de la présente invention et ne sera pas décrit ici dans tous ses détails.The introduction station also includes a fixed suction group 12 on a frame 13 suspended from the end of at least one, in this case at least two chains 14 via fixing lugs 15. The other end of the chains 14 is fixed to the output axis of a linear motor 18. The where the chains 14 pass around the chain wheels 22 mounted on a shaft transverse 23. One end of the frame 13 rests so that it can slide on a spacer 24 while the other is fitted with a guide arranged in the supports 27 fixed on each of the lateral uprights 28 of frames 47, 48 of the feeding station. This provision ensures an unchanged position of the suction group 12 relative to the rear edge of the stack of sheets 4, when it goes up or down under the action of the motor 18. The suction unit 12 includes several suction cups 29 (only one has been shown to simplify the drawing), as well as a first detector member 30 which will be described in more detail below. It is specified that the sucking group 12 is only described to understand how sheet feeding is done but that this known sucking group 12 is not part of the present invention and will not be described here in all its details.

Le premier organe détecteur 30, qui comprend un pied de biche 19 et une cellule de lecture 20, est placé au voisinage de la partie supérieure arrière de la pile de feuilles 4 sur un axe théorique correspondant à l'axe médian théorique de la pile de feuilles 4. Un second organe détecteur 32 est placé en face de la partie supérieure avant de la pile de feuilles 4 sur l'axe médian de cette pile. Ce second organe détecteur 32 est constitué de préférence par une caméra linéaire fixe disposée dans le sens de la hauteur de la pile de feuilles 4, de manière à fournir un signal analogique fonction du niveau mesuré.The first detector member 30, which includes a crowbar 19 and a reading cell 20, is placed in the vicinity of the upper part back of the stack of sheets 4 on a theoretical axis corresponding to the axis theoretical median of the stack of sheets 4. A second detector member 32 is placed in front of the upper front part of the stack of sheets 4 on the axis median of this stack. This second detector member 32 consists of preferably by a fixed linear camera arranged in the height direction of the stack of sheets 4, so as to provide an analog signal depending on the level measured.

Une butée avant escamotable 33 est montée pivotante autour d'un axe 34, à proximité du niveau supérieur de la face avant de la pile de feuilles 4. Le mouvement pivotant de la butée avant 33 est obtenu à l'aide d'un levier 35 commandé par une came 36, actionnée par le dispositif d'entraínement de la station d'introduction alimentée par les feuilles de la pile 4. Cette butée 33 comporte une fenêtre (non représentée) centrée sur l'axe médian de la pile de feuilles 4, pour permettre au détecteur 32 de voir constamment le niveau supérieur de cette pile 4.A retractable front stop 33 is pivotally mounted around a axis 34, near the upper level of the front face of the stack of sheets 4. The pivoting movement of the front stop 33 is obtained using a lever 35 controlled by a cam 36, actuated by the drive device of the introduction station fed by the sheets of stack 4. This stop 33 has a window (not shown) centered on the median axis of the stack of sheets 4, to allow the detector 32 to constantly see the level top of this stack 4.

Le premier organe détecteur 30 est connecté électriquement à l'un des circuits d'un calculateur 37 par un câble 38, alors que le second organe détecteur 32 est relié à un second circuit de ce même calculateur 37 à l'aide d'un câble 39. Lorsque le calculateur 37 reçoit un signal provenant du premier organe détecteur 30, il émet une information de sens positif ou négatif destinée à être transmise par le câble 40 au moteur 18 régissant le mouvement vertical du groupe suceur 12. The first detector member 30 is electrically connected to one circuits of a computer 37 by a cable 38, while the second member detector 32 is connected to a second circuit of this same computer 37 using of a cable 39. When the computer 37 receives a signal from the first detector organ 30, it transmits positive or negative sense information intended to be transmitted by the cable 40 to the motor 18 governing the vertical movement of the sucking group 12.

Comme illustré par le schéma-bloc de la figure 2, d'autres informations que celles fournies par le second détecteur 32 sont fournies au circuit du calculateur 37 pour asservir la vitesse du moteur réducteur 11. Ces informations sont relatives à la cadence de la machine, qui est donnée par les valeurs émises par un générateur d'impulsions 17 indiquant à quelle fréquence le groupe suceur 12 enlève les feuilles de la pile 4. L'épaisseur des feuilles de carton constitue l'autre donnée introduite dans le calculateur 37. Ces deux indications constituent les données permettant de déterminer la vitesse théorique à laquelle le moteur réducteur 11 doit faire monter la pile de feuilles 4. Cette vitesse, calculée sur la base de ces données constitue la vitesse de consigne du moteur réducteur 11. Le signal analogique fourni au calculateur par le second détecteur 32 permet à celui-ci d'évaluer en temps réel l'écart entre le niveau supérieur de la pile, mesuré par le second détecteur 32 et le niveau supérieur de référence de cette pile. Cette comparaison entre ces deux niveaux permet de former un signal de vitesse à la sortie du calculateur qui sera comparé à la vitesse en temps réel du moteur réducteur 11 fournie par un codeur 41 associé à ce moteur. Le résultat de la comparaison entre ces deux signaux de vitesses est utilisé pour modifier en plus ou en moins la fréquence d'alimentation du moteur grâce à un variateur de fréquence 42 connecté à ce moteur réducteur 11. De ce fait, le moteur réducteur 11 fait monter la pile de feuilles 4 en continu avec une vitesse constamment adaptée au niveau réel de la pile comparé au niveau de référence.As illustrated by the block diagram in Figure 2, other information that that provided by the second detector 32 is provided to the computer circuit 37 for controlling the speed of the reduction motor 11. These information relates to the cadence of the machine, which is given by the values emitted by a pulse generator 17 indicating how often the suction unit 12 removes the sheets from the stack 4. The thickness of the sheets of cardboard constitutes the other datum entered in the computer 37. These two indications constitute the data making it possible to determine the speed theoretical to which the reduction motor 11 must raise the stack of sheets 4. This speed, calculated on the basis of these data constitutes the speed of setpoint of the reduction motor 11. The analog signal supplied to the computer by the second detector 32 allows the latter to evaluate in real time the difference between the upper level of the stack, measured by the second detector 32 and the upper reference level of this stack. This comparison between these two levels allows to form a speed signal at the output of the computer which will be compared to the real-time speed of the reduction motor 11 provided by a encoder 41 associated with this motor. The result of the comparison between these two speed signals is used to change the frequency more or less power supply to the motor through a frequency converter 42 connected to this reduction motor 11. As a result, the reduction motor 11 raises the stack of sheets 4 continuously with a speed constantly adapted to the actual level of the stack compared to the reference level.

La station d'introduction peut également comprendre aussi un dispositif d'alimentation auxiliaire 50, communément appelé non-stop (NS), permettant d'effectuer le changement de pile sans interruption de débit de feuille. Ce dispositif d'alimentation auxiliaire 50 est composé d'un cadre 51 permettant la mise en place de barres 52 supportant la pile lorsque la grille 1 de montée de pile principale a atteint un niveau nécessitant le rechargement d'une nouvelle pile de feuilles. Ainsi, l'introduction des ces barres 52 sous la pile principale permet de former une grille auxiliaire supportant alors la pile principale de façon à ce que l'on puisse faire redescendre la grille 1 en position basse autorisant le chargement de la nouvelle pile.The introduction station can also also include a auxiliary supply device 50, commonly called non-stop (NS), allowing to change the battery without interrupting the flow of leaf. This auxiliary supply device 50 is composed of a frame 51 allowing the establishment of bars 52 supporting the stack when the grid 1 main battery rise reached a level requiring recharging of a new stack of leaves. Thus, the introduction of these bars 52 under the main stack allows to form an auxiliary grid while supporting the stack main so that we can lower the grid 1 in position low allowing charging of the new battery.

Ce dispositif non-stop est généralement doté d'un entraínement ayant une cinématique semblable à celle de la montée de la grille 1, et il comprend entre autres un moteur-réducteur 53 destiné à entraíner des roues à chaíne 54 autour desquelles passent les chaínes 55 assurant le mouvement vertical du cadre 51. Le moteur-réducteur 53 est lui aussi connecté au calculateur 37. Lorsque les feuilles sont débitées par le groupe suceur 12 depuis ce dispositif d'alimentation auxiliaire 50, la régulation de montée de la grille 1 est utilisée par ce dispositif d'alimentation auxiliaire 50.This non-stop device is generally equipped with a drive having a kinematics similar to that of the rise of grid 1, and it comprises inter alia a gear motor 53 intended to drive wheels with chain 54 around which the chains 55 ensure movement vertical of the frame 51. The gear motor 53 is also connected to the computer 37. When the sheets are cut by the suction unit 12 from this auxiliary supply device 50, the rise regulation of the grid 1 is used by this auxiliary supply device 50.

Claims (3)

Dispositif d'asservissement des organes délivrant des feuilles à partir d'une pile (4), à une machine les travaillant, comprenant au moins un mécanisme élévateur (1) de ladite pile, un organe d'introduction de feuilles muni de moyens de préhension (29), des moyens de détection du niveau supérieur de ladite pile comprenant un détecteur du niveau avant (32) de ladite pile (4) connecté à une entrée d'un calculateur (37) agissant sur au moins un moteur électrique (11) dudit mécanisme élévateur (1) de ladite pile et des moyens pour faire monter ladite pile (4) en fonction dudit niveau supérieur, caractérisé en ce que ledit détecteur du niveau avant (32) de ladite pile (4) comporte des moyens de mesure de la grandeur des variations du niveau de ladite pile et en ce qu'une entrée dudit calculateur (37) est de plus connectée à une source d'information (17) relative à la fréquence d'alimentation en temps réel et à l'épaisseur nominale desdites feuilles et que la sortie dudit calculateur (37) est connectée à au moins un variateur de fréquence (42) pour la commande du ou desdits moteurs électriques (11), ledit calculateur (37) étant agencé pour que la grandeur du signal apparaissant à sa sortie soit caractéristique de la différence entre le niveau mesuré de ladite pile (4) et celui calculé sur la base de ladite épaisseur nominale et de ladite fréquence d'alimentation et engendre une variation de fréquence du ou desdits variateurs (42) tendant à modifier la vitesse d'avance dudit moteur (11) pour faire coïncider le niveau mesuré avec un niveau de consigne.Device for controlling the organs delivering sheets from a stack (4), to a machine working them, comprising at least one lifting mechanism (1) of said stack, a sheet introducing member provided with gripping means (29), means for detecting the upper level of said cell comprising a detector of the front level (32) of said cell (4) connected to an input of a computer (37) acting on at least one electric motor (11) of said lifting mechanism (1) of said stack and means for raising said stack (4) as a function of said upper level, characterized in that said front level detector (32) of said stack (4) comprises means for measuring the magnitude of the variations in the level of said stack and in that an input of said computer (37) is further connected to a source of information (17) relating to the real-time supply frequency and to the nominal thickness of said leaves and that the so rtie of said computer (37) is connected to at least one frequency converter (42) for the control of said electric motor (s) (11), said computer (37) being arranged so that the magnitude of the signal appearing at its output is characteristic of the difference between the measured level of said stack (4) and that calculated on the basis of said nominal thickness and said supply frequency and generates a frequency variation of said variator (s) (42) tending to modify the feed speed of said motor (11) to make the measured level coincide with a set level. Dispositif selon la revendication 1, caractérisé en ce que ledit détecteur (32) du niveau avant de ladite pile 4 est une caméra linéaire disposée dans le sens de la hauteur de ladite pile.Device according to claim 1, characterized in that said detector (32) of the front level of said stack 4 is a linear camera arranged in the height direction of said stack. Dispositif selon la revendication 1, caractérisé en ce que le mécanisme élévateur (1) est associé à un dispositif d'alimentation auxiliaire (50) dont le moteur de commande (53) est connecté au calculateur (37) de façon ce que sa vitesse d'avance soit déterminée à l'aide des mêmes informations que celles utilisées pour la commande du ou des moteurs électriques (11) du mécanisme élévateur (1).Device according to claim 1, characterized in that the lifting mechanism (1) is associated with an auxiliary supply device (50) whose control motor (53) is connected to the computer (37) so that its speed d 'advance is determined using the same information as that used for the control of the electric motor or motors (11) of the lifting mechanism (1).
EP01110578A 2000-05-16 2001-04-30 Device for controlling the means for feeding sheets in a machine Expired - Lifetime EP1170228B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00963/00A CH693850A5 (en) 2000-05-16 2000-05-16 A servo-control bodies delivering sheets to a machine.
CH9632000 2000-05-16

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EP1170228A2 true EP1170228A2 (en) 2002-01-09
EP1170228A3 EP1170228A3 (en) 2003-01-08
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KR (1) KR100426418B1 (en)
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AT (1) ATE314297T1 (en)
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BR (1) BR0101972B1 (en)
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KR100426418B1 (en) 2004-04-08
ES2255524T3 (en) 2006-07-01
ATE314297T1 (en) 2006-01-15
AU777199B2 (en) 2004-10-07
BR0101972A (en) 2001-12-26
EP1170228A3 (en) 2003-01-08
US6874780B2 (en) 2005-04-05
US20010042954A1 (en) 2001-11-22
US20040061275A1 (en) 2004-04-01
JP3488212B2 (en) 2004-01-19
DE60116191D1 (en) 2006-02-02
TW533179B (en) 2003-05-21
CA2347477C (en) 2005-03-15
CA2347477A1 (en) 2001-11-16
CN1323729A (en) 2001-11-28
CH693850A5 (en) 2004-03-15
AU4382001A (en) 2001-11-22
EP1170228B1 (en) 2005-12-28
BR0101972B1 (en) 2010-11-03
DE60116191T2 (en) 2006-08-24
CN1141233C (en) 2004-03-10
KR20010105195A (en) 2001-11-28
JP2002012328A (en) 2002-01-15

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