EP0387476B1 - Device to pick-up flat sheets separated form each other by an air blast - Google Patents

Device to pick-up flat sheets separated form each other by an air blast Download PDF

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Publication number
EP0387476B1
EP0387476B1 EP89870041A EP89870041A EP0387476B1 EP 0387476 B1 EP0387476 B1 EP 0387476B1 EP 89870041 A EP89870041 A EP 89870041A EP 89870041 A EP89870041 A EP 89870041A EP 0387476 B1 EP0387476 B1 EP 0387476B1
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EP
European Patent Office
Prior art keywords
sheets
sheet
stack
air flow
direct
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
EP89870041A
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German (de)
French (fr)
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EP0387476A1 (en
Inventor
Guy Martin
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Individual
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Individual
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Filing date
Publication date
Priority to PCT/BE1989/000012 priority Critical patent/WO1990011240A1/en
Priority to EP89903067A priority patent/EP0470951A1/en
Priority to ES89870041T priority patent/ES2049845T3/en
Priority to EP89870041A priority patent/EP0387476B1/en
Priority to AT8989870041T priority patent/ATE105668T1/en
Application filed by Individual filed Critical Individual
Priority to US07/768,400 priority patent/US5328165A/en
Priority to DE68915457T priority patent/DE68915457T2/en
Publication of EP0387476A1 publication Critical patent/EP0387476A1/en
Application granted granted Critical
Publication of EP0387476B1 publication Critical patent/EP0387476B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B65H3/00—Separating articles from piles
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/48—Air blast acting on edges of, or under, articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/12—Suction bands, belts, or tables moving relatively to the pile
    • B65H3/124—Suction bands or belts
    • B65H3/128—Suction bands or belts separating from the top of pile

Definitions

  • the present invention relates to a device for automatically and regularly picking up flat sheets, for example sheets of paper, on a stack of sheets feeding a machine in which flat sheets move one by one, for example an assembly machine.
  • Friction devices use constant pressure maintained on the sheet by means of pads or casters.
  • the pressure adjustment is delicate, which only allows the treatment of a fairly limited range of sheets and does not allow the treatment of very thin sheets, for example delicate papers.
  • the suction and friction devices are not insensitive to variations in the parameters which characterize the sheets to be taken from a pile: physical dimensions, weight and size of the sheets; their humidity, their mutual adhesion, static electricity, these parameters also being randomly variable within the same stack of leaves of the same nature.
  • physical dimensions, weight and size of the sheets Considering in particular sheets of paper, it should be noted that the consumption of paper is changing in the direction of a constant increase in the use of delicate papers, for example carbonless papers. Friction machines currently known do not meet the working conditions in this area, and suction machines hardly meet them.
  • a stack of sheets of paper for example, is characterized by various parameters such as size and weight of sheets, static electricity, humidity, mutual adhesion due to the freshness of the printing ink. These parameters are randomly variable within the same stack of paper of the same kind. This is the cause of problems in the separation of sheets in assembly machines, hence the need for pre-treatment before going through the machine.
  • the present invention provides a solution to this problem and has as its object a device for efficiently fading a stack of sheets placed in the feeding compartment of a machine so as to ensure the delivery of the sheets one by one, even in the if sheets stick to each other or if the top sheet cannot be taken from the stack of sheets.
  • a feed box of an exemplary assembly machine Above a feed table 1 is mounted a sheet pickup device 2.
  • the sheet pickup device illustrated by way of example comprises a perforated grid 4 mounted on a frame of the assembly so as to be able to move by translation under the action of a drive mechanism comprising in particular the toothed wheels and rollers 5.
  • the grid 4 is closed on itself and it has a section 6 which can move above the table 1 in the direction of the ejection area 3.
  • a suction means constituted for example by fans 7.
  • a deflector 9 mounted above the ejection area 3 and extending over the entire transverse width of the device advantageously closes the top of the ejection area.
  • the upper sheets of the stack vibrate and the top sheet bends, comes into contact with the grid 6 and is held there glued by suction through the grid. .
  • This sheet is then driven by the grid 6 when the latter is set in motion and it is guided towards the ejection area 3 while the next sheet is sucked against the grid. The sheets are thus sucked one by one and routed successively to the ejection area.
  • the relative distance between the lower plane 6 of the grid and the top of the stack of sheets on the feed table is kept constant as the height of the stack of sheets decreases.
  • the feed table 1 is for example mounted on a mechanism intended to move it vertically as the height of the stack of sheets decreases so as to maintain the top of the stack at a constant distance from the section of grid 6.
  • the sheet picking device could be mounted so as to be itself displaced relative to the feed table 1 which would be fixed.
  • the control of all the organs can be integrated into a general automatic control programming of the device under the surveillance of detection elements controlled by a processor which can be incorporated into the machine.
  • Detection elements are provided for monitoring the operation of the sheet picking device.
  • a detection element is used to detect the presence or absence of sheets on the feed table 1.
  • Several detection elements can be arranged with predetermined spacings so as to be able to detect the format of the sheets stacked on the table supply 1 and order the commissioning of the desired number of fans 7 and a detection element is used to control the passage of the sheets in the ejection area 3.
  • the deflaming device is designated as a whole at 10. It comprises an air flow generator constituted, for example, by a turbine 15 extending along the bottom wall 18 of the feed table 1, under the ejection area 3, and this turbine 15 is associated with deflector means arranged so as to direct at least one air flow turbulent practically on the front side of the upper sheets of the stack of sheets 100 as will be seen.
  • the box bottom wall 18 has several openings 19; these are clearly visible in Figure 2. These openings 19 are normally closed by a shutter formed by a valve 21 mounted to be able to pivot around an axis 22 fixed at its ends to the frame of the machine. The tilting of the valve 21 takes place by means of a connecting rod 27 mounted at one end of the valve 21 and driven by an electromagnet 16 as shown in the view of FIG. 3.
  • valves 23 and 25 whose role will be described later. These upper valves are mounted so that they can pivot around the axes 24 and 26 fixed to the frame of the machine.
  • the valves 23 and 25 are actuated by connecting rods 28 and 29 mounted at one end of the valves and driven by an electromagnet 17 as shown in the view of FIG. 4.
  • the descaling device 10 is controlled by a control processor which can be the general control processor of the machine.
  • the processor cooperates with a detection device arranged to permanently monitor the presence of the sheets in the free space 8 in the vicinity of the grid section 6 and to detect any operating anomaly on the grid: absence sheet, presence of several sheets glued to each other, crumpled or folded sheet, sheet of different thickness or print, etc.
  • the detection device is a thickness detector mounted and arranged to control permanently the thickness of material located in front of the grid section 6 of the sheet pickup device 2.
  • the thickness detector consists of a photoelectric cell 11 responding to a light beam generated by a source 12.
  • the detector cell 11 produces an electrical signal which is a function of the thickness of the material intercepting the light beam at a location that is always identical.
  • the control system of the descaling device is represented by the block diagram of FIG. 5.
  • the control unit 14 of the microprocessor receives the detection signal D generated by the detector 11 and compares it with a setpoint R extracted from a reference memory 13.
  • the instruction R represents a value or a range of values of the detection signal corresponding to the presence of a calibrated sheet.
  • the limit values of a predetermined reference range of values will be designated for example by R1 and R2.
  • the microprocessor is organized so that the control unit 14 produces a control signal for one or the other of the electromagnets 16 and 17 which control the deflector means according to the value of the detection signal D relative to the values of reference R1 and R2.
  • the detection signal D is included between the reference signals R1 and R2 and the microprocessor does not command any correction.
  • the valves 21, 23 and 25 are then held in their closed position as shown in Figure 1 and the turbine 15 is stopped.
  • the sheet driven by the grid 6 is then routed towards the ejection area 3.
  • the sheet in question, identified as corresponding to the reference value, then moves to a detection cell located downstream of a pressure member consisting of the rollers 31 and 32: the roller 31 is in continuous rotation and roller 32 is mounted to be lifted under the control of an electromagnet (not shown) so as to pinch the ejected sheet and advance it towards the output members.
  • the detection cell 11 produces a signal D of value greater than the reference signal R2 and the microprocessor 14 produces a first signal of CD1 command to excite the electromagnet 16 driving the lower valve 21 in order to move the latter downwards and gradually bring it into its open position illustrated in FIG. 6 while the turbine 15 is turned on .
  • the valve drive mechanism 21 In Figure 6 is not shown the valve drive mechanism 21.
  • the air flow generated by the turbine 15 is guided by the channel A towards the openings 19 and is thus directed on the front side of the stack sheets 100.
  • the leaves are then raised in a fan and the upper sheet 101 is sucked against the grid 6 while the other sheets fall on the stack 100 by the air which creeps between the upper sheet and the next sheet.
  • the device is restored to the rest state as soon as the detection cell 11 detects the presence of a sheet 101 in its detection field. As long as it meets the required conditions, this sheet is then drawn towards the ejection area 3.
  • the detection signal D produced by the cell 11 is lower than the reference signal R1 and the microprocessor 14 produces a second control signal CD2 to excite the electromagnet 17 which drives the upper valves 23 and 25 in order to place them in the positions shown in FIG. 7. In order not to overload this figure, the mechanism for driving the valves 23 and 25 is not shown there.
  • the air flow generated by the turbine 15 is then directed through the channel B towards the ejection area 3 and it is thus directed towards the front edge of the sheets located in the detection field of the cell 11.
  • the sheets vibrate and the air flow B creeps between the sheets so that the upper sheet 101 is sucked against the grid 6 while the other sheets are folded over the stack of sheets 100.
  • the device is restored to the resting state as soon as the detection cell 11 detects the presence of the single sheet 101 in its detection field and provided that it meets the required conditions, this sheet is then drawn towards the area d ejection 3.
  • the de-scaling device ensures the removal of sheets one by one. Any leaf picking anomaly is identified within the system without the leaf being moved from its original pile. A sheet is only delivered to the ejection area 3 when it meets the required conditions, which considerably reduces waste and operator intervention.
  • the system automatically adjusts its rate according to the quality of the sheets to be treated. It makes it possible to reach high rates at the exit of the box in good conditions. Finally it makes it possible to detect a sheet which is not of the same impression, a sheet of different thickness, a crumpled or folded sheet.
  • the range of papers that can be treated is very wide, for example from 10 grams to 300 grams, or even more in some cases.
  • the descaling device according to the invention can be combined with any sheet picking device, for example a common suction sheet picking device.
  • any sheet picking device for example a common suction sheet picking device.
  • the combination of the de-scaling device according to the invention with a suction device for picking up sheets as described in the foregoing and illustrated by way of example in the accompanying drawings is particularly advantageous by the optimal result which results therefrom. term of efficiency and flow.
  • This arrangement according to the invention made it possible to produce a flow rate of the order of 130 sheets per minute with a feed box.
  • the advantages of the device according to the invention are particularly attractive for feeding a collator comprising several sheets feeding boxes.
  • the regular flow of strictly controlled sheets makes it possible to ensure a perfect superposition of the sheets in the assembly system thanks to the synchronization of the control of the pressing members 31 and 32 of each box.
  • the control pulses successively actuate the pressing members of each box so as to advance the sheets successively towards a conveyor belt 33 circulating on the cylinders 34, 35 and 36.
  • the sheets delivered by a feed box are advantageously pressed between the carpet 33 and a carpet 37 which rolls on the cylinders 38 and 39.
  • the carpet 37 can extend over the entire height of the collator.
  • the sheets delivered by any feed box overlap the sheets delivered by the upper feed boxes and the bundle of superimposed sheets, pressed between a belt 33 and the belt 37, is brought to the ejection zone of the assembler.
  • the detection elements as well as other more usual control organs are advantageously controlled by a processor which constitutes the management organ of the entire device. Its programming gives rise to interactive servos with a view, for example and without limitation, to controlling the starting, stopping and speed of the motors of the fans, to controlling and modulating the effects of the fan-off device, to controlling the translation of the grid, to maintain the relative distance between the lower plane of the grid and the top of the stack of sheets as a function of the detection information permanently supplied by the aforementioned detection elements.
  • This programmed arrangement makes it possible to continuously monitor the operation of the sheet picking device and to check in particular the nature of each sheet taken from the top of the stack so as to immediately detect any anomaly before transfer to the ejection area and stop the device automatically to remedy the anomaly, then restart the machine. Reliability and efficiency of the automation are improved in an optimal manner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Controlling Sheets Or Webs (AREA)

Abstract

In conjunction with an apparatus for seizing flat sheets on a stack of sheets arranged on a supply table (1), a sheet-separating device (10) is characterized by an air flow generator (15) and guide means (A,B) designed to direct a turbulent air flow produced by said generator (15) on at least one side of the stack of sheets. The guide means comprise, for example, a first tube (A) arranged so as to direct a flow of air produced by said generator (15) onto one side of the upper part of the stack of sheets (100) placed on the supply table (1) and a second tube (B) for directing an air flow produced by said generator (15) in the upper part of the free space (8) located under the sheet-seizing device (2).

Description

La présente invention concerne un dispositif pour la prise automatique et régulière de feuilles planes, par exemple des feuilles de papier, sur une pile de feuilles alimentant une machine dans laquelle des feuilles planes se déplacent une à une, par exemple une assembleuse.The present invention relates to a device for automatically and regularly picking up flat sheets, for example sheets of paper, on a stack of sheets feeding a machine in which flat sheets move one by one, for example an assembly machine.

Art antérieurPrior art

Il existe divers types de dispositifs de prise de feuilles capables de délivrer les feuilles à une cadence prédéterminée. Dans les dispositifs à succion, les feuilles sont en contact avec des sucettes et leur transport se fait par déplacement mécanique des sucettes. Le caoutchouc des sucettes se dessèche et est cause de remplacements plus ou moins fréquents. De plus, ces dispositifs nécessitent un réglage délicat de l'aspiration. Une anomalie (par exemple une feuille double) n'est détectée que lorsque les feuilles ont effectué un certain déplacement, ce qui occasionne souvent des bourrages, des rebuts et l'intervention de l'opérateur.There are various types of sheet pickers capable of delivering the sheets at a predetermined rate. In suction devices, the sheets are in contact with lollipops and their transport takes place by mechanical displacement of the lollipops. The rubber of the lollipops dries out and causes more or less frequent replacements. In addition, these devices require a delicate adjustment of the suction. An anomaly (for example a double sheet) is only detected when the sheets have made a certain movement, which often causes jams, scrap and operator intervention.

Les dispositifs à friction font appel à une pression constante maintenue sur la feuille au moyen de patins ou roulettes. Le réglage de la pression est délicat, ce qui ne permet que le traitement d'une gamme de feuilles assez limitée et ne permet pas le traitement de feuilles très minces, par exemple des papiers délicats.Friction devices use constant pressure maintained on the sheet by means of pads or casters. The pressure adjustment is delicate, which only allows the treatment of a fairly limited range of sheets and does not allow the treatment of very thin sheets, for example delicate papers.

Les dispositifs à succion et à friction ne sont pas insensibles aux variations des paramètres qui caractérisent les feuilles à prélever sur une pile : dimensions physiques, poids et encombrement des feuilles; leur humidité, leur adhérence mutuelle, l'électricité statique, ces paramètres étant de surcroît variables de façon aléatoire au sein d'une même pile de feuilles de même nature. Considérant en particulier des feuilles de papier, il est à remarquer que la consommation de papier évolue dans le sens d'un accroissement constant de l'emploi de papiers délicats, par exemple les papiers autocopiants. Les machines à friction connues actuellement ne répondent pas aux conditions de travail dans ce domaine, et les machines à succion y répondent difficilement.The suction and friction devices are not insensitive to variations in the parameters which characterize the sheets to be taken from a pile: physical dimensions, weight and size of the sheets; their humidity, their mutual adhesion, static electricity, these parameters also being randomly variable within the same stack of leaves of the same nature. Considering in particular sheets of paper, it should be noted that the consumption of paper is changing in the direction of a constant increase in the use of delicate papers, for example carbonless papers. Friction machines currently known do not meet the working conditions in this area, and suction machines hardly meet them.

On connaît également un dispositif de prise de feuilles à aspiration à travers une grille mobile, qui est d'une construction simple et compacte et qui est capable de fonctionner de façon fiable et à cadence élevée avec des feuilles d'épaisseur, de nature et de dimensions différentes, réduisant considérablement les rebuts et les interventions de l'opérateur (EP-A-2738898),There is also known a device for picking up sheets by suction through a movable grid, which is of a simple and compact construction and which is capable of operating reliably and at high speed with sheets of thickness, nature and different dimensions, considerably reducing waste and operator intervention (EP-A-2738898),

Pour assurer un débit régulier et rapide des feuilles, il est essentiel que les feuilles soient prélevées et délivrées une à une de façon fiable. Or il peut se faire que deux ou davantage de feuilles collent l'une à l'autre ou que la feuille supérieure d'une pile de feuilles ne parvienne pas à être prélevée sur la pile.To ensure a regular and rapid flow of leaves, it is essential that the leaves are picked and delivered one by one reliably. However, it may happen that two or more sheets stick to one another or that the upper sheet of a stack of leaves cannot be taken from the stack.

Une pile de feuilles de papier, par exemple, se caractérise par divers paramètres tels que dimensions et poids des feuilles, l'électricité statique, l'humidité, adhérence mutuelle due à la fraîcheur de l'encre d'impression. Ces paramètres sont variables de façon aléatoire au sein d'une même pile de papier de même nature. C'est la cause de problèmes dans la séparation des feuilles dans les machines d'assemblage, d'où la nécessité d'un pré-traitement avant le passage en machine.A stack of sheets of paper, for example, is characterized by various parameters such as size and weight of sheets, static electricity, humidity, mutual adhesion due to the freshness of the printing ink. These parameters are randomly variable within the same stack of paper of the same kind. This is the cause of problems in the separation of sheets in assembly machines, hence the need for pre-treatment before going through the machine.

Exposé de l'inventionStatement of the invention

La présente invention apporte une solution à ce problème et a pour objet un dispositif pour déramer efficacement une pile de feuilles mise en place dans la case d'alimentation d'une machine de manière à assurer la livraison des feuilles une à une, même dans le cas où des feuilles collent l'une à l'autre ou dans le cas où la feuille supérieure ne parvient pas à être prélevée sur la pile de feuilles. Les particularités de l'invention sont définies dans les revendications ci-annexées.The present invention provides a solution to this problem and has as its object a device for efficiently fading a stack of sheets placed in the feeding compartment of a machine so as to ensure the delivery of the sheets one by one, even in the if sheets stick to each other or if the top sheet cannot be taken from the stack of sheets. The features of the invention are defined in the appended claims.

Description des dessinsDescription of the drawings

L'invention est exposée dans ce qui suit à l'aide des dessins joints. Dans ces dessins :

  • La figure 1 est une vue en élévation, avec coupe partielle, d'un mode de réalisation exemplaire de l'invention.
  • La figure 2 est une vue suivant la ligne II-II de la figure 1, avec arrachement.
  • La figure 3 est une vue suivant la ligne III-III de la figure 2.
  • La figure 4 est une vue suivant la ligne IV-IV de la figure 2.
  • La figure 5 est un schéma par blocs du système de commande du dispositif de déramage selon l'invention.
  • Les figures 6 et 7 illustrent deux états de fonctionnement du dispositif de déramage selon l'invention.
The invention is set out in the following with the aid of the accompanying drawings. In these drawings:
  • Figure 1 is an elevational view, partly in section, of an exemplary embodiment of the invention.
  • Figure 2 is a view along line II-II of Figure 1, with cutaway.
  • FIG. 3 is a view along line III-III of FIG. 2.
  • Figure 4 is a view along line IV-IV of Figure 2.
  • FIG. 5 is a block diagram of the control system of the swaging device according to the invention.
  • Figures 6 and 7 illustrate two operating states of the de-scaling device according to the invention.

Description d'un mode de réalisation exemplaireDescription of an exemplary embodiment

Se reportant à la figure 1 on voit une case d'alimentation d'une machine assembleuse exemplaire. Au-dessus d'une table d'alimentation 1 est monté un dispositif de prise de feuilles 2. Le dispositif de prise de feuilles illustré à titre d'exemple comprend une grille perforée 4 montée sur un bâti de l'ensemble de manière à pouvoir se déplacer par translation sous l'action d'un mécanisme d'entraînement comprenant notamment les roues dentées et des galets 5. Dans l'exécution illustrée, la grille 4 est fermée sur elle-même et elle comporte un tronçon 6 qui peut se déplacer au-dessus de la table 1 en direction de l'aire d'éjection 3. Au-dessus du tronçon de grille 6 est monté un moyen d'aspiration constitué par exemple par des ventilateurs 7. Un déflecteur 9 monté au-dessus de l'aire d'éjection 3 et s'étendant sur toute la largeur transversale du dispositif ferme avantageusément le dessus de l'aire d'éjection.Referring to Figure 1 we see a feed box of an exemplary assembly machine. Above a feed table 1 is mounted a sheet pickup device 2. The sheet pickup device illustrated by way of example comprises a perforated grid 4 mounted on a frame of the assembly so as to be able to move by translation under the action of a drive mechanism comprising in particular the toothed wheels and rollers 5. In the illustrated embodiment, the grid 4 is closed on itself and it has a section 6 which can move above the table 1 in the direction of the ejection area 3. Above the grid section 6 is mounted a suction means constituted for example by fans 7. A deflector 9 mounted above the ejection area 3 and extending over the entire transverse width of the device advantageously closes the top of the ejection area.

Une pile de feuilles planes se trouvant déposée sur la table d'alimentation 1 et les ventilateurs d'aspiration 7 étant mis en marche, ceux-ci créent un appel d'air dans l'espace libre 8, les flux d'air aspirés pénétrant dans ledit espace par les côtés latéraux ouverts du dispositif. Sous l'action de ces flux d'air latéraux, les feuilles supérieures de la pile se mettent en vibration et la feuille du dessus s'infléchit, vient en contact avec la grille 6 et s'y maintient collée par aspiration à travers la grille. Cette feuille est alors entraînée par la grille 6 lorsque celle-ci est mise en mouvement et elle est guidée vers l'aire d'éjection 3 tandis que la feuille suivante se trouve aspirée contre la grille. Les feuilles se trouvent ainsi aspirées une à une et acheminées successivement vers l'aire d'éjection.A stack of flat sheets lying on the feed table 1 and the suction fans 7 being turned on, these create a call for air in the free space 8, the flows of sucked air entering said space through the open lateral sides of the device . Under the action of these lateral air flows, the upper sheets of the stack vibrate and the top sheet bends, comes into contact with the grid 6 and is held there glued by suction through the grid. . This sheet is then driven by the grid 6 when the latter is set in motion and it is guided towards the ejection area 3 while the next sheet is sucked against the grid. The sheets are thus sucked one by one and routed successively to the ejection area.

La distance relative entre le plan inférieur 6 de la grille et le dessus de la pile de feuilles sur la table d'alimentation est maintenue constante au fur et à mesure que diminue la hauteur de la pile de feuilles. La table d'alimentation 1 est par exemple montée sur un mécanisme destiné à la déplacer verticalement au fur et à mesure de la diminution de la hauteur de la pile de feuilles de manière à maintenir le dessus de la pile à une distance constante du tronçon de grille 6. A l'inverse, le dispositif de prise de feuilles pourrait être monté de manière à être lui-même déplacé par rapport à la table d'alimentation 1 qui serait fixe.The relative distance between the lower plane 6 of the grid and the top of the stack of sheets on the feed table is kept constant as the height of the stack of sheets decreases. The feed table 1 is for example mounted on a mechanism intended to move it vertically as the height of the stack of sheets decreases so as to maintain the top of the stack at a constant distance from the section of grid 6. Conversely, the sheet picking device could be mounted so as to be itself displaced relative to the feed table 1 which would be fixed.

La simplicité et la compacité du dispositif de prise de feuilles décrit plus haut, qui ne comprend ni sucettes, ni roulettes, ni patins, permettent d'en faire un élément ou module particulièrement avantageux et fiable pour des machines intégrées de construction modulaire.The simplicity and compactness of the sheet picking device described above, which does not include lollipops, rollers or skids, make it a particularly advantageous and reliable element or module for integrated machines of modular construction.

La commande de tous les organes peut être intégrée dans une programmation de commande automatique générale du dispositif sous la surveillance d'éléments de détection contrôlés par un processeur qui peut être incorporé à la machine. Des éléments de détection sont prévus pour contrôler le fonctionnement du dispositif de prise de feuilles. En particulier, un élément de détection sert à détecter la présence ou l'absence de feuilles sur la table d'alimentation 1. Plusieurs éléments de détection peuvent être disposés avec des écartements prédéterminés de manière à pouvoir détecter le format des feuilles empilées sur la table d'alimentation 1 et commander la mise en service du nombre voulu de ventilateurs 7 et un élément de détection sert à contrôler le passage des feuilles dans l'aire d'éjection 3.The control of all the organs can be integrated into a general automatic control programming of the device under the surveillance of detection elements controlled by a processor which can be incorporated into the machine. Detection elements are provided for monitoring the operation of the sheet picking device. In particular, a detection element is used to detect the presence or absence of sheets on the feed table 1. Several detection elements can be arranged with predetermined spacings so as to be able to detect the format of the sheets stacked on the table supply 1 and order the commissioning of the desired number of fans 7 and a detection element is used to control the passage of the sheets in the ejection area 3.

Pour assurer un débit régulier et rapide des feuilles, il est essentiel que les feuilles soient prélevées sur la table d'alimentation et délivrées une à une. Ce résultat est atteint grâce à l'invention par un dispositif de déramage agencé de manière à agir efficacement dans les cas où une anomalie de fonctionnement survient, par exemple lorsque plusieurs feuilles collent ensemble.To ensure a regular and rapid flow of sheets, it is essential that the sheets are taken from the feed table and delivered one by one. This result is achieved thanks to the invention by a descaling device arranged so as to act effectively in cases where an operating anomaly occurs, for example when several sheets stick together.

Un mode d'exécution exemplaire du dispositif de déramage selon l'invention est illustré dans les dessins joints. Le dispositif de déramage est désigné dans son ensemble en 10. Il comprend un générateur de flux d'air constitué à titre exemplaire par une turbine 15 s'étendant le long de la paroi de fond 18 de la table d'alimentation 1, sous l'aire d'éjection 3, et cette turbine 15 est associée à des moyens déflecteurs agencés de manière à diriger au moins un flux d'air turbulent pratiquement sur le côté avant des feuilles supérieures de la pile de feuilles 100 ainsi qu'on va le voir. Dans le mode d'exécution illustré, la paroi de fond de case 18 présente plusieurs ouvertures 19; celles-ci sont bien visibles à la figure 2. Ces ouvertures 19 sont normalement obturées par un obturateur formé par un clapet 21 monté pour pouvoir pivoter autour d'un axe 22 fixé à ses extrémités au bâti de la machine. Le basculement du clapet 21 se fait grâce à une bielle 27 montée à une extrémité du clapet 21 et entraînée par un électro-aimant 16 comme montré dans la vue de la figure 3.An exemplary embodiment of the de-scaling device according to the invention is illustrated in the accompanying drawings. The deflaming device is designated as a whole at 10. It comprises an air flow generator constituted, for example, by a turbine 15 extending along the bottom wall 18 of the feed table 1, under the ejection area 3, and this turbine 15 is associated with deflector means arranged so as to direct at least one air flow turbulent practically on the front side of the upper sheets of the stack of sheets 100 as will be seen. In the illustrated embodiment, the box bottom wall 18 has several openings 19; these are clearly visible in Figure 2. These openings 19 are normally closed by a shutter formed by a valve 21 mounted to be able to pivot around an axis 22 fixed at its ends to the frame of the machine. The tilting of the valve 21 takes place by means of a connecting rod 27 mounted at one end of the valve 21 and driven by an electromagnet 16 as shown in the view of FIG. 3.

Dans le mode de réalisation illustré, on voit encore deux clapets supérieurs 23 et 25 dont le rôle sera décrit plus loin. Ces clapets supérieurs sont montés pour pouvoir pivoter autour des axes 24 et 26 fixés au bâti de la machine. Les clapets 23 et 25 sont actionnés par des bielles 28 et 29 montées à une extrémité des clapets et entraînées par un électro-aimant 17 comme montré dans la vue de la figure 4.In the illustrated embodiment, we still see two upper valves 23 and 25 whose role will be described later. These upper valves are mounted so that they can pivot around the axes 24 and 26 fixed to the frame of the machine. The valves 23 and 25 are actuated by connecting rods 28 and 29 mounted at one end of the valves and driven by an electromagnet 17 as shown in the view of FIG. 4.

Le dispositif de déramage 10 est commandé par un processeur de commande qui peut être le processeur de commande générale de la machine. Pour la commande du dispositif de déramage, le processeur coopère avec un dispositif de détection agencé pour surveiller en permanence la présence des feuilles dans l'espace libre 8 au voisinage du tronçon de grille 6 et pour détecter toute anomalie de fonctionnement sur la grille : absence de feuille, présence de plusieurs feuilles collées l'une à l'autre, feuille chiffonnée ou pliée, feuille d'épaisseur ou d'impression différente, etc. Plus spécialement, le dispositif de détection est un détecteur d'épaisseur monté et agencé pour contrôler en permanence l'épaisseur de matière se trouvant devant le tronçon de grille 6 du dispositif de prise de feuilles 2. Dans le mode d'exécution exemplaire illustré, le détecteur d'épaisseur est constitué d'une cellule photo-électrique 11 répondant à un faisceau lumineux engendré par une source 12. La cellule détectrice 11 produit un signal électrique qui est fonction de l'épaisseur de la matière interceptant le faisceau lumineux à un endroit toujours identique.The descaling device 10 is controlled by a control processor which can be the general control processor of the machine. For the control of the descaling device, the processor cooperates with a detection device arranged to permanently monitor the presence of the sheets in the free space 8 in the vicinity of the grid section 6 and to detect any operating anomaly on the grid: absence sheet, presence of several sheets glued to each other, crumpled or folded sheet, sheet of different thickness or print, etc. More specifically, the detection device is a thickness detector mounted and arranged to control permanently the thickness of material located in front of the grid section 6 of the sheet pickup device 2. In the exemplary embodiment illustrated, the thickness detector consists of a photoelectric cell 11 responding to a light beam generated by a source 12. The detector cell 11 produces an electrical signal which is a function of the thickness of the material intercepting the light beam at a location that is always identical.

Le système de commande du dispositif de déramage selon l'invention est représenté par le schéma par blocs de la figure 5. L'unité de commande 14 du microprocesseur reçoit le signal de détection D engendré par le détecteur 11 et le compare à une consigne R extraite d'une mémoire de référence 13. La consigne R représente une valeur ou une plage de valeurs du signal de détection correspondant à la présence d'une feuille calibrée. On désignera par exemple par R1 et R2 les valeurs limites d'une plage de valeurs de référence prédéterminée. Le microprocesseur est organisé de manière que l'unité de commande 14 produise un signal de commande pour l'un ou l'autre des électro-aimants 16 et 17 qui commandent les moyens déflecteurs selon la valeur du signal de détection D par rapport aux valeurs de référence R1 et R2.The control system of the descaling device according to the invention is represented by the block diagram of FIG. 5. The control unit 14 of the microprocessor receives the detection signal D generated by the detector 11 and compares it with a setpoint R extracted from a reference memory 13. The instruction R represents a value or a range of values of the detection signal corresponding to the presence of a calibrated sheet. The limit values of a predetermined reference range of values will be designated for example by R1 and R2. The microprocessor is organized so that the control unit 14 produces a control signal for one or the other of the electromagnets 16 and 17 which control the deflector means according to the value of the detection signal D relative to the values of reference R1 and R2.

Lorsqu'une feuille adéquate se trouve présente dans le champ de détection de la cellule détectrice 11, le signal de détection D est compris entre les signaux de référence R1 et R2 et le microprocesseur ne commande aucune correction. Les clapets 21, 23 et 25 sont alors maintenus dans leur position de fermeture comme montré dans la figure 1 et la turbine 15 est à l'arrêt. La feuille entraînée par la grille 6 est alors acheminée vers l'aire d'éjection 3. La feuille en question, identifiée comme correspondant à la valeur de référence, se déplace alors jusqu'à une cellule de détection située en aval d'un organe de pression constitué des rouleaux 31 et 32: le rouleau 31 est en rotation continue et le rouleau 32 est monté pour être soulevé sous la commande d'un électro-aimant (non montré) de manière à pincer la feuille éjectée et la faire avancer vers les organes de sortie.When a suitable sheet is present in the detection field of the detector cell 11, the detection signal D is included between the reference signals R1 and R2 and the microprocessor does not command any correction. The valves 21, 23 and 25 are then held in their closed position as shown in Figure 1 and the turbine 15 is stopped. The sheet driven by the grid 6 is then routed towards the ejection area 3. The sheet in question, identified as corresponding to the reference value, then moves to a detection cell located downstream of a pressure member consisting of the rollers 31 and 32: the roller 31 is in continuous rotation and roller 32 is mounted to be lifted under the control of an electromagnet (not shown) so as to pinch the ejected sheet and advance it towards the output members.

Dans le cas où aucune feuille n'est présente dans le champ de détection de la cellule 11 dans un délai imparti, la cellule de détection 11 produit un signal D de valeur supérieure au signal de référence R2 et le microprocesseur 14 produit un premier signal de commande CD1 pour exciter l'électro-aimant 16 entraînant le clapet inférieur 21 afin de mouvoir celui-ci vers le bas et l'amener progressivement dans sa position d'ouverture illustrée à la figure 6 tandis que la turbine 15 se trouve mise en marche. Dans la figure 6 n'est pas représenté le mécanisme d'entraînement du clapet 21. Le flux d'air généré par la turbine 15 est guidé par le canal A vers les ouvertures 19 et se trouve ainsi dirigé sur le côté avant de la pile de feuilles 100. Les feuilles se soulèvent alors en éventail et la feuille supérieure 101 se fait aspirer contre la grille 6 tandis que les autres feuilles retombent sur la pile 100 par l'air qui s'insinue entre la feuille supérieure et la feuille suivante. Le dispositif se rétablit à l'état de repos dès que la cellule de détection 11 détecte la présence d'une feuille 101 dans son champ de détection. Pour autant qu'elle réponde aux conditions requises, cette feuille est alors entraînée vers l'aire d'éjection 3. Lorsque plusieurs feuilles collent ensemble et se trouvent aspirées vers la grille 6 dans le temps imparti, le signal de détection D produit par la cellule 11 est inférieur au signal de référence R1 et le microprocesseur 14 produit un second signal de commande CD2 pour exciter l'électro-aimant 17 qui entraîne les clapets supérieurs 23 et 25 afin de les placer dans les positions montrées à la figure 7. Afin de ne pas surcharger cette figure, le mécanisme d'entraînement des clapets 23 et 25 n'y est pas représenté. Le flux d'air généré par la turbine 15 est alors dirigé par le canal B vers l'aire d'éjection 3 et il se trouve ainsi dirigé vers le bord avant des feuilles se trouvant dans le champ de détection de la cellule 11. Les feuilles se mettent en vibration et le flux d'air B s'insinue entre les feuilles de telle sorte que la feuille supérieure 101 se trouve aspirée contre la grille 6 tandis que les autres feuilles se trouvent rabattues sur la pile de feuilles 100. Le dispositif se rétablit à l'état de repos dès que la cellule de détection 11 détecte la présence de la seule feuille 101 dans son champ de détection et pour autant qu'elle réponde aux conditions requises, cette feuille se trouve alors entraînée vers l'aire d'éjection 3.In the case where no sheet is present in the detection field of the cell 11 within a given time, the detection cell 11 produces a signal D of value greater than the reference signal R2 and the microprocessor 14 produces a first signal of CD1 command to excite the electromagnet 16 driving the lower valve 21 in order to move the latter downwards and gradually bring it into its open position illustrated in FIG. 6 while the turbine 15 is turned on . In Figure 6 is not shown the valve drive mechanism 21. The air flow generated by the turbine 15 is guided by the channel A towards the openings 19 and is thus directed on the front side of the stack sheets 100. The leaves are then raised in a fan and the upper sheet 101 is sucked against the grid 6 while the other sheets fall on the stack 100 by the air which creeps between the upper sheet and the next sheet. The device is restored to the rest state as soon as the detection cell 11 detects the presence of a sheet 101 in its detection field. As long as it meets the required conditions, this sheet is then drawn towards the ejection area 3. When several sheets stick together and are sucked towards the grid 6 in the given time, the detection signal D produced by the cell 11 is lower than the reference signal R1 and the microprocessor 14 produces a second control signal CD2 to excite the electromagnet 17 which drives the upper valves 23 and 25 in order to place them in the positions shown in FIG. 7. In order not to overload this figure, the mechanism for driving the valves 23 and 25 is not shown there. The air flow generated by the turbine 15 is then directed through the channel B towards the ejection area 3 and it is thus directed towards the front edge of the sheets located in the detection field of the cell 11. The sheets vibrate and the air flow B creeps between the sheets so that the upper sheet 101 is sucked against the grid 6 while the other sheets are folded over the stack of sheets 100. The device is restored to the resting state as soon as the detection cell 11 detects the presence of the single sheet 101 in its detection field and provided that it meets the required conditions, this sheet is then drawn towards the area d ejection 3.

Grâce à l'action complémentaire des flux d'air turbulent, le dispositif de déramage selon l'invention assure le prélèvement de feuilles une par une. Toute anomalie de prélèvement de feuilles se trouve identifiée à l'intérieur du système sans que la feuille ne soit déplacée de son tas initial. Une feuille n'est délivrée dans l'aire d'éjection 3 que lorsqu'elle répond aux conditions requises, ce qui réduit considérablement les déchets et les interventions de l'opérateur. De plus, le système ajuste automatiquement sa cadence en fonction de la qualité des feuilles à traiter. Il permet d'atteindre des cadences élevées en sortie de case dans de bonnes conditions. Enfin il permet de détecter une feuille qui n'est pas de même impression, une feuille d'épaisseur différente, une feuille chiffonnée ou pliée. Dans le cas de feuilles de papier, la gamme des papiers pouvant être traités est très vaste, par exemple de 10 grammes à 300 grammes, voire même plus dans certains cas.Thanks to the complementary action of the turbulent air flows, the de-scaling device according to the invention ensures the removal of sheets one by one. Any leaf picking anomaly is identified within the system without the leaf being moved from its original pile. A sheet is only delivered to the ejection area 3 when it meets the required conditions, which considerably reduces waste and operator intervention. In addition, the system automatically adjusts its rate according to the quality of the sheets to be treated. It makes it possible to reach high rates at the exit of the box in good conditions. Finally it makes it possible to detect a sheet which is not of the same impression, a sheet of different thickness, a crumpled or folded sheet. In the case of sheets of paper, the range of papers that can be treated is very wide, for example from 10 grams to 300 grams, or even more in some cases.

Le dispositif de déramage selon l'invention peut être combiné à un dispositif de prise de feuilles quelconque, par exemple un dispositif de prise de feuilles à succion courant. Cependant, la combinaison du dispositif de déramage selon l'invention avec un dispositif de prise de feuilles à aspiration tel que décrit dans ce qui précède et illustré à titre d'exemple dans les dessins joints est particulièrement avantageuse par le résultat optimal qui en découle en terme d'efficacité et de débit. Cet agencement selon l'invention a permis de réaliser un débit de l'ordre de 130 feuilles par minute avec une case d'alimentation.The descaling device according to the invention can be combined with any sheet picking device, for example a common suction sheet picking device. However, the combination of the de-scaling device according to the invention with a suction device for picking up sheets as described in the foregoing and illustrated by way of example in the accompanying drawings is particularly advantageous by the optimal result which results therefrom. term of efficiency and flow. This arrangement according to the invention made it possible to produce a flow rate of the order of 130 sheets per minute with a feed box.

Les avantages du dispositif selon l'invention sont particulièrement attrayants pour l'alimentation d'une assembleuse comportant plusieurs cases d'alimentation de feuilles. Le débit régulier de feuilles rigoureusement contrôlées permet d'assurer une superposition parfaite des feuilles dans le système d'assemblage grâce à la synchronisation de la commande des organes presseurs 31 et 32 de chaque case. Dans le cas d'une assembleuse verticale, dans laquelle plusieurs cases d'alimentation se trouvent superposées, les impulsions de commande actionnent successivement les organes presseurs de chaque case de manière à faire avancer les feuilles successivement vers un tapis transporteur 33 circulant sur les cylindres 34, 35 et 36. Les feuilles délivrées par une case d'alimentation se trouvent avantageusement pressées entre le tapis 33 et un tapis 37 qui roule sur les cylindres 38 et 39. Le tapis 37 peut s'étendre sur toute la hauteur de l'assembleuse. Les feuilles délivrées par une case d'alimentation quelconque se superposent aux feuilles délivrées par les cases d'alimentation supérieures et la liasse de feuilles superposées, pressée entre un tapis 33 et le tapis 37, est amenée vers la zone d'éjection de l'assembleuse.The advantages of the device according to the invention are particularly attractive for feeding a collator comprising several sheets feeding boxes. The regular flow of strictly controlled sheets makes it possible to ensure a perfect superposition of the sheets in the assembly system thanks to the synchronization of the control of the pressing members 31 and 32 of each box. In the case of a vertical collator, in which several feed boxes are superimposed, the control pulses successively actuate the pressing members of each box so as to advance the sheets successively towards a conveyor belt 33 circulating on the cylinders 34, 35 and 36. The sheets delivered by a feed box are advantageously pressed between the carpet 33 and a carpet 37 which rolls on the cylinders 38 and 39. The carpet 37 can extend over the entire height of the collator. The sheets delivered by any feed box overlap the sheets delivered by the upper feed boxes and the bundle of superimposed sheets, pressed between a belt 33 and the belt 37, is brought to the ejection zone of the assembler.

Comme dit plus haut, les éléments de détection ainsi que d'autres organes de contrôle plus usuels sont avantageusement contrôlés par un processeur qui constitue l'organe de gestion de l'ensemble du dispositif. Sa programmation donne lieu à des asservissements interactifs en vue, par exemple et de manière non limitative, de commander la mise en marche, l'arrêt et la vitesse des moteurs des ventilateurs, de commander et moduler les effets du dispositif de déramage, de commander la translation de la grille, de maintenir la distance relative entre le plan inférieur de la grille et le dessus de la pile de feuilles en fonction des informations de détection fournies en permanence par les éléments de détection précités. Cet agencement programmé permet de contrôler en continu le fonctionnement du dispositif de prise de feuilles et de vérifier en particulier la nature de chaque feuille prélevée sur le dessus de la pile de manière à détecter immédiatement toute anomalie avant le transfert vers l'aire d'éjection et arrêter automatiquement le dispositif pour permettre de pallier l'anomalie relevée, puis remettre la machine en marche. La fiabilité et le rendement de l'automatisme s'en trouvent améliorés de façon optimale.As said above, the detection elements as well as other more usual control organs are advantageously controlled by a processor which constitutes the management organ of the entire device. Its programming gives rise to interactive servos with a view, for example and without limitation, to controlling the starting, stopping and speed of the motors of the fans, to controlling and modulating the effects of the fan-off device, to controlling the translation of the grid, to maintain the relative distance between the lower plane of the grid and the top of the stack of sheets as a function of the detection information permanently supplied by the aforementioned detection elements. This programmed arrangement makes it possible to continuously monitor the operation of the sheet picking device and to check in particular the nature of each sheet taken from the top of the stack so as to immediately detect any anomaly before transfer to the ejection area and stop the device automatically to remedy the anomaly, then restart the machine. Reliability and efficiency of the automation are improved in an optimal manner.

Claims (3)

  1. A device for the take-up of plane sheets from a stack of sheets arranged on a feed table (1), comprising a peel-off device (10) with an air-flow generator (15), guide means (A, B) arranged to direct a turbulent air flow produced by said generator (15) onto at least one side of the sheet stack, and a control device (14) responding to a detection signal (D) generated by a sheet-presence detector (11) mounted above the feed table (1) for detecting the presence or the thickness of a sheet on the sheet take-up device, characterized in that the control device (14) is responsive, depending on the detection signal (D), in order to either direct the air flow via a first channel (A) in such a way that the sheets are lifted from the sheet stack (100) in a fan-shaped manner and in such a way that the upper sheet (101) is sucked up towards the sheet take-up device (2), or direct the air flow via a second channel (B) in such a way that the sheets lifted from the sheet stack (100) are set in vibration and in such a way that these sheets, save the upper sheet (101), fall back onto the sheet stack (100), or inhibit the air flow.
  2. A device as set forth in claim 1, characterized in that the control device (14) generates a first control signal (CD1) for actuating a guide means (21) in order to direct the air flow via the first channel (A) when the detection signal (D) is higher than a predetermined reference signal (R2).
  3. A device as set forth in claim 1, characterized in that the control device (14) generates a second control signal (CD2) for actuating a guide means (23, 25) in order to direct the air flow via the second channel (B) when the detection signal (D) is lower than a predetermined reference signal (R1).
EP89870041A 1989-03-17 1989-03-17 Device to pick-up flat sheets separated form each other by an air blast Expired - Lifetime EP0387476B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP89903067A EP0470951A1 (en) 1989-03-17 1989-03-17 Flat sheet-seizing apparatus with a turbulent air flow sheet-separating device
ES89870041T ES2049845T3 (en) 1989-03-17 1989-03-17 DEVICE FOR TAKING FLAT LEAVES WITH DEFLECTION WITH TURBULENT AIR FLOW.
EP89870041A EP0387476B1 (en) 1989-03-17 1989-03-17 Device to pick-up flat sheets separated form each other by an air blast
AT8989870041T ATE105668T1 (en) 1989-03-17 1989-03-17 SEPARATING DEVICE FOR PLANE SHEETS USING A TURBULENCE BLOWING NOZZLE
PCT/BE1989/000012 WO1990011240A1 (en) 1989-03-17 1989-03-17 Flat sheet-seizing apparatus with a turbulent air flow sheet-separating device
US07/768,400 US5328165A (en) 1989-03-17 1989-03-17 Device for the take-up of plane sheets with peel-off by turbulent air flow
DE68915457T DE68915457T2 (en) 1989-03-17 1989-03-17 Separation device for sheets by means of a turbulence blowing nozzle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89870041A EP0387476B1 (en) 1989-03-17 1989-03-17 Device to pick-up flat sheets separated form each other by an air blast

Publications (2)

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EP0387476A1 EP0387476A1 (en) 1990-09-19
EP0387476B1 true EP0387476B1 (en) 1993-12-29

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EP89903067A Pending EP0470951A1 (en) 1989-03-17 1989-03-17 Flat sheet-seizing apparatus with a turbulent air flow sheet-separating device
EP89870041A Expired - Lifetime EP0387476B1 (en) 1989-03-17 1989-03-17 Device to pick-up flat sheets separated form each other by an air blast

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EP89903067A Pending EP0470951A1 (en) 1989-03-17 1989-03-17 Flat sheet-seizing apparatus with a turbulent air flow sheet-separating device

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US (1) US5328165A (en)
EP (2) EP0470951A1 (en)
AT (1) ATE105668T1 (en)
DE (1) DE68915457T2 (en)
ES (1) ES2049845T3 (en)
WO (1) WO1990011240A1 (en)

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EP0110649A2 (en) * 1982-11-24 1984-06-13 Tektronix, Inc. Paper handling apparatus for a copier
GB2164926A (en) * 1984-09-27 1986-04-03 Xerox Corp Air-assisted top sheet feeder
EP0273898A2 (en) * 1986-12-30 1988-07-06 Guy Martin Device for separating flat sheets

Also Published As

Publication number Publication date
DE68915457T2 (en) 1994-10-13
ES2049845T3 (en) 1994-05-01
EP0387476A1 (en) 1990-09-19
US5328165A (en) 1994-07-12
WO1990011240A1 (en) 1990-10-04
DE68915457D1 (en) 1994-06-23
EP0470951A1 (en) 1992-02-19
ATE105668T1 (en) 1994-05-15

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