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EP0507662A1 - Device for forming a pile of flat objects, particularly for postal envelopes - Google Patents

Device for forming a pile of flat objects, particularly for postal envelopes Download PDF

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Publication number
EP0507662A1
EP0507662A1 EP92400877A EP92400877A EP0507662A1 EP 0507662 A1 EP0507662 A1 EP 0507662A1 EP 92400877 A EP92400877 A EP 92400877A EP 92400877 A EP92400877 A EP 92400877A EP 0507662 A1 EP0507662 A1 EP 0507662A1
Authority
EP
European Patent Office
Prior art keywords
envelopes
stack
carriage
strip
mobile
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.)
Withdrawn
Application number
EP92400877A
Other languages
German (de)
French (fr)
Inventor
Pierre Darchis
Laurent Baufreton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LA POSTE AUTONOME DE DROIT PUBLIC Ets
Original Assignee
LA POSTE AUTONOME DE DROIT PUBLIC Ets
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LA POSTE AUTONOME DE DROIT PUBLIC Ets filed Critical LA POSTE AUTONOME DE DROIT PUBLIC Ets
Publication of EP0507662A1 publication Critical patent/EP0507662A1/en
Withdrawn legal-status Critical Current

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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
    • B65H83/00—Combinations of piling and depiling operations, e.g. performed simultaneously, of interest apart from the single operation of piling or depiling as such
    • B65H83/02—Combinations of piling and depiling operations, e.g. performed simultaneously, of interest apart from the single operation of piling or depiling as such performed on the same pile or stack
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C1/00—Measures preceding sorting according to destination
    • B07C1/02—Forming articles into a stream; Arranging articles in a stream, e.g. spacing, orientating
    • B07C1/025—Devices for the temporary stacking of objects provided with a stacking and destacking device (interstack device)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H31/00—Pile receivers
    • B65H31/04—Pile receivers with movable end support arranged to recede as pile accumulates
    • B65H31/06—Pile receivers with movable end support arranged to recede as pile accumulates the articles being piled on edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/40—Movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/34—Pressure, e.g. fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/20—Sensing or detecting means using electric elements
    • B65H2553/21—Variable resistances, e.g. rheostats, potentiometers or strain gauges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1916—Envelopes and articles of mail

Definitions

  • the present invention relates to a device making it possible to produce a homogeneous stack of flat objects, in particular mail envelopes delivered by a conveyor coming from a machine for processing this mail, these envelopes all being on one of their edge and in the same direction but which may correspond to different formats, weights or thicknesses and also be present at the entrance of the device according to any formation, being separated from one to the other or on the contrary being partially overlapping to form a continuous line.
  • the present invention relates to a stacking device which overcomes these drawbacks, by allowing the stacking of objects one by one or in tiled formation, whatever the speed of supply of these objects. It also allows manual or automatic access to one end of the stack during formation, with in addition a minimal dispersion of the qualities of homogeneity of the stack and offset of the envelopes compared to a reference dihedral against the planes of which those -these build as the stack is created.
  • the device considered comprising a conveyor delivering the objects and in particular mail envelopes one by one, separated or with a mutual covering of each of these envelopes by the following, and a stacking head carried by a carriage mobile as the stack is formed, this carriage comprising at least one strip made of a material with a significant coefficient of friction, controlled in continuous rotation to drive the envelopes in its movement, these being presented with one of their edges resting on a horizontal plane in the direction of a vertical jogging plane forming with the horizontal plane a reference dihedral, is characterized in that the strip of the stacking head is mounted on four rotary rollers arranged according to the vertices d '' a deformable parallelogram, two vertices of which are fixed and the other two are mobile but maintained at a distance determined by a spacer, the displacement of movable vertices taking place as a function of the pressure exerted by the strip on the stack in formation, permanently measured by a stress sensor acting on the movement control of the carriage, parallel
  • the mobile carriage carrying the stacking head is driven by a toothed belt meshing with a pinion controlled by a gearmotor, so that the rotation of this pinion as the stack is formed determines a movement in the opposite direction of the carriage.
  • the spacer now at a given distance the two movable rollers of the parallelogram, these have their axes secured to a support guided in a displacement groove provided in the chassis of the movable carriage. Also preferably, the support of the rollers cooperates with a ball slide, mounted in the displacement groove.
  • a calibrated spring stop is associated with the stress sensor in order to allow, when the pressure on the pile exceeds a given maximum threshold, the displacement of the movable rollers and the disengagement of the carriage the stacking head.
  • a pulse wheel is mounted substantially tangent to the plane of the strip, so that the envelopes cause this wheel to rotate during their movements with the strip, the wheel providing then a train of pulses characterizing the positioning of these envelopes prior to their introduction into the stack for the subsequent control of a possible catch-up mechanism.
  • the reference 1 designates as a whole a device for the formation of a stack of flat objects according to the invention, these objects being in particular constituted by envelopes 2 which, in the example considered, have the same format but which, in variants, could have different dimensions from one to the other within a certain limit, these envelopes further comprising thicknesses and weights which are not necessarily identical from one envelope to the next.
  • the envelopes 2 rest by their edge or lower edge on a horizontal plane support 3 and are jogged laterally on one of their sides by means of a vertical edge 4, the plane of the support and of the edge forming in particular a reference dihedron for stack of envelopes 2.
  • envelopes are conveyed to the device by means of a conveyor assembly 5, conventionally comprising in any mail sorting installation two parallel belts, respectively 6 and 7, capable of pinching the envelopes between them to ensure their displacement in at the same time as the belts, the envelopes being able to be separated or overlap each other from one to the other in so-called tiled formation.
  • a conveyor assembly 5 conventionally comprising in any mail sorting installation two parallel belts, respectively 6 and 7, capable of pinching the envelopes between them to ensure their displacement in at the same time as the belts, the envelopes being able to be separated or overlap each other from one to the other in so-called tiled formation.
  • the belt 6 is guided on rollers or rollers, respectively 8a, 8b, 8c, against which are supported by the strands go 6a then return 6b of this belt.
  • the belt 7 is guided by rollers 9a, 9b, 9c, 9d, with its forward and reverse strands 7a and 7b partially surrounding these rollers according to the path determined by the latter.
  • the most distant rollers, respectively 8b for the belt 6, 9d for the belt 7, are arranged so that each of the envelopes 2 is distributed at the end of the conveyor 5 towards a stacking head 10, the latter being designed so as to drive these envelopes one by one, by positioning them suitably in the dihedral formed by the support 3 and the edge 4.
  • the stacking head 10 is supported by a movable carriage 11 having laterally a flange 12 surrounding the side of the support 3 so that the movement of the carriage can be carried out parallel to the edge of the aforementioned reference dihedron, as and as the stack is formed and in particular variations in thickness thereof.
  • This movement is in particular carried out, in itself known manner, by means of a toothed belt 13, guided on toothed rollers 14, at least one of which is driven by a geared motor 15 carried by the carriage.
  • the carriage 11 extends transversely with respect to the head 10 so as to support the guide rollers of the belts 6 and 7 which thus move with the carriage, the conveyor 5 being provided with means (not shown) permanently allowing the slack in the belts to be taken up according to the position of the carriage.
  • the stack of envelopes 2 is thus formed between the stacking head 10 and a frame 16 schematically represented in FIG. 1, making it possible to extract these envelopes one by one from this stack, either with a given separation between each of the envelopes as illustrated in the drawing, either in regular tiled formation where these envelopes overlap mutually over part of their length, the envelopes being taken up in a discharge conveyor 17 comprising, like the feed conveyor 5 at least two parallel belts 18 and 19 pinching the envelopes together, these belts being guided on rollers d 'parallel axes 20.
  • the frame 16 comprises an appropriate unstacking head whose characteristics are preferably in accordance with those described and represented in patent application N ° 91,040 46 filed on April 3, 1991 in the name of the applicants for "Device one-by-one extraction of flat objects from a stack of such objects, including letter envelopes. "
  • the stacking head 10 is constituted by means of four rollers with parallel axes arranged along the vertices of a rhombus, the rollers 21 and 22 being provided along the long diagonal thereof and the rollers 23 and 24 along the small .
  • the axes of the rollers 21 and 22 are carried by the carriage 11 and therefore immobilized in a relative position relative to the latter, while the axes of the other two rollers 23 and 24 are supported by a spacer 25, which maintains a spacing between these axes determined.
  • FIGS. 2 to 4 illustrate more particularly the structure of the different parts of the device and in particular of the stacking head 10.
  • the head 10 comprises a drive belt 26 stretched over the four rollers 21 to 24, one of the rollers whose axis is carried by the carriage 11, for example the roller 22, comprising a control pinion 27, the rotation of which is caused by means of a return belt 28, itself engaged by means of a clutch (not shown) with a second pinion 29 keyed or otherwise secured to the shaft of a geared motor 30, so that this rotation is synchronized on the speed of introduction of the envelopes 2 at the outlet of the conveyor 5.
  • the belt 26 is made of a material having an appropriate coefficient of friction, relatively high, so that, during its rotation on the rollers 21 to 24, it drives the envelopes 2 as and when they come before it at the outlet of the conveyor 5 between the strands 6a and 7a of the belts 6 and 7, in line with the rollers 8b and 9d as shown in Figure 4 in particular.
  • the axes of the rollers 21 and 22 are arranged so that the envelopes 2 which are placed in the bottom of the reference dihedral make with the band a limited but determined angle.
  • the two rollers 23 and 24, joined by the spacer 25 and arranged in the direction of the small diagonal of the rhombus, the sides of which are delimited by the strip 26, are mounted so that they can slide together parallel to this direction, thanks to a support 31 slidably mounted in a ball slide 32, provided at the lower part of these rollers in the facing surface of the carriage 11.
  • the support 31 also has a lateral extension 33 provided to cooperate with a stop 34 acting on a strain gauge 35, capable of indicating, as a function of its deformation under the thrust of the support 31, the value of the pressure exerted on the stack of envelopes and of acting accordingly on the geared motor 15 carrying out the movement of the carriage.
  • a calibrated spring (not shown) is associated with the stop 34 in order to keep the gauge 35 under stress as long as the pressure on the stack of envelopes does not exceed a determined maximum threshold, corresponding to the limit deformation of the gauge, and allow the latter to escape in the event of overpressure, without damaging it, for example in the event of a jam in the stack or of placing in it an object of excessive thickness.
  • the equipment of the device is completed by means of an optical pulse wheel 36, mounted freely in rotation about an axis 37, provided at the end of a support arm 34, this wheel being mounted approximately tangentially. to a lateral plane of the rhombus delimited by the drive band 26, and driven in permanent rotation by the latter so as to provide trains of pulses making it possible to measure the positioning of the envelopes with respect to a given reference, in particular in order to control by means of this information the control of the unstacking head provided in the frame 16 opposite the stacking head 10 and to act in particular on a possible catch-up mechanism.
  • the proposed device therefore makes it possible to thus continuously carry out the measurement of the pressure of the stack of envelopes on the stacking head, such information being essential for the precise control of the movements of the mobile carriage.
  • the regulation of this pressure is adjusted, so that it ensures both the maintenance of the stack and the preservation of a minimum adhesion of each envelope with respect to the drive belt, without interfering with any moment its insertion into it.
  • the extensometric pressure sensor is adapted to provide very precise values, even for a small deformation thereof, thereby making it possible to keep practically constant the angle with which the envelopes are introduced into the head. stacking, this angle constituting an essential parameter for the constitution and the maintenance of the stack, whatever the format, thickness and weight of the treated envelopes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

Device for forming a stack of flat objects, in particular postal envelopes, comprising a conveyor (5), a stacking head (10) and a mobile carriage (11) comprising at least one strip made of a material with a substantial friction coefficient, controlled in rotation to drive the envelopes (2), the latter turning up with one of their edges resting on a horizontal plane (3) in the direction of a vertical plane for aligning (4) forming with the horizontal place a reference dihedron. <??>According to the invention, this device is characterised in that the strip of the stacking head is mounted on four rotating rollers arranged along the apexes of a parallelogram which can be deformed, two apexes (21, 22) being fixed and the two other (23, 24) being mobile but held at a given distance by a spacer (25), the displacement of the mobile apexes being carried out as a function of the pressure exerted by the strip on the stack being formed, measured permanently by a strain sensor acting on the control of the carriage movement, in a direction parallel to the edge of the reference dihedron. <IMAGE>

Description

La présente invention est relative à un dispositif permettant de réaliser une pile homogène d'objets plats, en particulier d'enveloppes de courrier délivrées par un convoyeur en provenance d'une machine de traitement de ce courrier, ces enveloppes se présentant toutes sur une de leur tranche et dans le même sens mais pouvant correspondre à des formats, des poids ou des épaisseurs différentes et également se présenter à l'entrée du dispositif selon une formation quelconque, en étant séparées de l'une à l'autre ou au contraire se recouvrant partiellement pour constituer une file continue.The present invention relates to a device making it possible to produce a homogeneous stack of flat objects, in particular mail envelopes delivered by a conveyor coming from a machine for processing this mail, these envelopes all being on one of their edge and in the same direction but which may correspond to different formats, weights or thicknesses and also be present at the entrance of the device according to any formation, being separated from one to the other or on the contrary being partially overlapping to form a continuous line.

On connaît déjà dans la technique des machines d'empilage qui réalisent une pile homogène d'objets plats. Toutefois, ces machines présentent des inconvénients. En particulier, elles ne permettent généralement pas d'accommoder aussi bien des enveloppes qui se présentent une à une qu'en formation tuilée où ces enveloppes se recouvrent en partie, le cas échéant avec des longueurs de chevauchement variables d'un objet à l'autre. Egalement, ces machines connues ne permettent pas de manière sûre de tenir compte de la pression des enveloppes dans la pile formée et d'adapter la cadence de formation de la pile à cette pression.Are already known in the art stacking machines which produce a homogeneous stack of flat objects. However, these machines have drawbacks. In particular, they do not generally make it possible to accommodate envelopes which are presented one by one as well as in tiled formation where these envelopes partially overlap, where appropriate with variable lengths of overlap from object to object. other. Also, these known machines do not allow the pressure of the envelopes in the formed stack to be taken into account in a reliable manner and to adapt the rate of formation of the stack to this pressure.

La présente invention a pour objet un dispositif d'empilage qui pallie ces inconvénients, en permettant la mise en pile des objets un à un ou en formation tuilée, quelle que soit la vitesse d'amenée de ces objets. Elle permet également un accès manuel ou automatique à une extrémité de la pile en cours de formation, avec en outre une dispersion minimale des qualités d'homogénéité de la pile et de décalage des enveloppes par rapport à un dièdre de référence contre les plans duquel celles-ci s'appuient au fur et à mesure de la création de la pile.The present invention relates to a stacking device which overcomes these drawbacks, by allowing the stacking of objects one by one or in tiled formation, whatever the speed of supply of these objects. It also allows manual or automatic access to one end of the stack during formation, with in addition a minimal dispersion of the qualities of homogeneity of the stack and offset of the envelopes compared to a reference dihedral against the planes of which those -these build as the stack is created.

A cet effet, le dispositif considéré, comportant un convoyeur délivrant les objets et en particulier des enveloppes de courrier une à une, séparées ou avec un recouvrement mutuel de chacune de ces enveloppes par la suivante, et une tête d'empilage portée par un chariot mobile au fur et à mesure de la formation de la pile, ce chariot comportant au moins une bande en un matériau à coefficient de frottement notable, commandée en rotation continue pour entraîner les enveloppes dans son déplacement, celles-ci se présentant avec un de leurs bords en appui sur un plan horizontal en direction d'un plan vertical de taquage formant avec le plan horizontal un dièdre de référence, se caractérise en ce que la bande de la tête d'empilage est montée sur quatre galets rotatifs disposés selon les sommets d'un parallélogramme déformable, dont deux sommets sont fixes et les deux autres sont mobiles mais maintenus à écartement déterminé par une entretoise , le déplacement des sommets mobiles s'effectuant en fonction de la pression exercée par la bande sur la pile en formation, mesurée en permanence par un capteur de contraintes agissant sur la commande de déplacement du chariot, parallèlement à l'arête du dièdre de référence.To this end, the device considered, comprising a conveyor delivering the objects and in particular mail envelopes one by one, separated or with a mutual covering of each of these envelopes by the following, and a stacking head carried by a carriage mobile as the stack is formed, this carriage comprising at least one strip made of a material with a significant coefficient of friction, controlled in continuous rotation to drive the envelopes in its movement, these being presented with one of their edges resting on a horizontal plane in the direction of a vertical jogging plane forming with the horizontal plane a reference dihedral, is characterized in that the strip of the stacking head is mounted on four rotary rollers arranged according to the vertices d '' a deformable parallelogram, two vertices of which are fixed and the other two are mobile but maintained at a distance determined by a spacer, the displacement of movable vertices taking place as a function of the pressure exerted by the strip on the stack in formation, permanently measured by a stress sensor acting on the movement control of the carriage, parallel to the edge of the reference dihedron.

De préférence, le chariot mobile portant la tête d'empilage est entraîné par une courroie crantée engrénant avec un pignon commandé par un motoréducteur, de telle sorte que la rotation de ce pignon au fur et à mesure de la formation de la pile détermine un déplacement en sens inverse du chariot.Preferably, the mobile carriage carrying the stacking head is driven by a toothed belt meshing with a pinion controlled by a gearmotor, so that the rotation of this pinion as the stack is formed determines a movement in the opposite direction of the carriage.

Avantageusement, l'entretoise maintenant à écartement donné les deux galets mobiles du parallélogramme, ceux-ci ont leurs axes solidaires d'un support guidé dans une rainure de déplacement prévue dans le châssis du chariot mobile. De préférence également, le support des galets coopère avec une glissière à billes, montée dans la rainure de déplacement.Advantageously, the spacer now at a given distance the two movable rollers of the parallelogram, these have their axes secured to a support guided in a displacement groove provided in the chassis of the movable carriage. Also preferably, the support of the rollers cooperates with a ball slide, mounted in the displacement groove.

En outre et selon une autre caractéristique de l'invention, une butée à ressort taré est associée au capteur de contraintes afin de permettre, lorsque la pression sur la pile dépasse un seuil maximal donné, le déplacement des galets mobiles et le dégagement du chariot portant la tête d'empilage.In addition and according to another characteristic of the invention, a calibrated spring stop is associated with the stress sensor in order to allow, when the pressure on the pile exceeds a given maximum threshold, the displacement of the movable rollers and the disengagement of the carriage the stacking head.

Enfin et dans un mode de réalisation préféré de l'invention, une roue à impulsions est montée sensiblement tangente au plan de la bande, de telle sorte que les enveloppes provoquent la rotation de cette roue lors de leurs déplacements avec la bande, la roue fournissant alors un train d'impulsions caractérisant le positionnement de ces enveloppes préalablement à leur introduction dans la pile pour la commande ultérieure d'un mécanisme de rattrapage éventuel.Finally and in a preferred embodiment of the invention, a pulse wheel is mounted substantially tangent to the plane of the strip, so that the envelopes cause this wheel to rotate during their movements with the strip, the wheel providing then a train of pulses characterizing the positioning of these envelopes prior to their introduction into the stack for the subsequent control of a possible catch-up mechanism.

D'autres caractéristiques d'un dispositif pour la formation d'objets plats, notamment d'enveloppes de lettres apparaîtront encore à travers la description qui suit d'un exemple de réalisation, donné à titre indicatif et non limitatif, en référence aux dessins annexés sur lesquels :

  • La Figure 1 est une vue schématique, en perspective, du dispositif considéré.
  • La Figure 2 est une vue en coupe transversale, à plus grande échelle, de la tête d'empilage mise en oeuvre dans le dispositif.
  • La Figure 3 est une vue en coupe selon un plan perpendiculaire à celui de la Figure 2, illustrant plus particulièrement la position relative de la glissière à billes pour le déplacement des galets mobiles de la tête d'empilage.
Other characteristics of a device for the formation of flat objects, in particular of letter envelopes will become more apparent from the following description of an exemplary embodiment, given by way of non-limiting example, with reference to the accompanying drawings. on which ones :
  • Figure 1 is a schematic perspective view of the device under consideration.
  • Figure 2 is a cross-sectional view, further large scale, of the stacking head used in the device.
  • Figure 3 is a sectional view along a plane perpendicular to that of Figure 2, illustrating more particularly the relative position of the ball slide for the movement of the movable rollers of the stacking head.

Sur la Figure 1, la référence 1 désigne dans son ensemble un dispositif pour la formation d'une pile d'objets plats selon l'invention, ces objets étant notamment constitués par des enveloppes 2 qui, dans l'exemple considéré, présentent le même format mais qui, en variantes, pourraient avoir des dimensions différentes de l'une à l'autre dans une certaine limite, ces enveloppes comportant en outre des épaisseurs et des poids qui ne sont pas nécessairement identiques d'une enveloppe à la suivante.In FIG. 1, the reference 1 designates as a whole a device for the formation of a stack of flat objects according to the invention, these objects being in particular constituted by envelopes 2 which, in the example considered, have the same format but which, in variants, could have different dimensions from one to the other within a certain limit, these envelopes further comprising thicknesses and weights which are not necessarily identical from one envelope to the next.

Les enveloppes 2 reposent par leur tranche ou bord inférieur sur un support plan 3 horizontal et sont taquées latéralement sur un de leurs côtés au moyen d'une rive verticale 4, les plan du support et de la rive formant notamment un dièdre de référence pour la pile des enveloppes 2.The envelopes 2 rest by their edge or lower edge on a horizontal plane support 3 and are jogged laterally on one of their sides by means of a vertical edge 4, the plane of the support and of the edge forming in particular a reference dihedron for stack of envelopes 2.

Ces enveloppes sont acheminées vers le dispositif au moyen d'un ensemble de convoyage 5, comprenant de façon classique dans toute installation de tri du courrier deux courroies parallèles, respectivement 6 et 7, aptes à pincer entre elles les enveloppes pour en assurer le déplacement en même temps que les courroies, les enveloppes pouvant être séparées ou se recouvrir mutuellement de l'une à l'autre en formation dite tuilée.These envelopes are conveyed to the device by means of a conveyor assembly 5, conventionally comprising in any mail sorting installation two parallel belts, respectively 6 and 7, capable of pinching the envelopes between them to ensure their displacement in at the same time as the belts, the envelopes being able to be separated or overlap each other from one to the other in so-called tiled formation.

Dans l'exemple représenté, la courroie 6 est guidée sur des rouleaux ou galets, respectivement 8a, 8b, 8c, contre lesquels s'appuient les brins aller 6a puis retour 6b de cette courroie. De la même manière, la courroie 7 est guidée par des galets 9a, 9b, 9c, 9d, avec ses brins aller 7a et retour 7b entourant en partie ces galets selon le trajet déterminé par ces derniers. En particulier, on voit que les galets les plus éloignés, respectivement 8b pour la courroie 6, 9d pour la courroie 7, sont disposés de telle sorte que chacune des enveloppes 2 soit distribuée à l'extrémité du convoyeur 5 vers une tête d'empilage 10, celle-ci étant conçue de manière à entraîner ces enveloppes une à une, en les positionnant de façon convenable dans le dièdre formé par le support 3 et la rive 4.In the example shown, the belt 6 is guided on rollers or rollers, respectively 8a, 8b, 8c, against which are supported by the strands go 6a then return 6b of this belt. In the same way, the belt 7 is guided by rollers 9a, 9b, 9c, 9d, with its forward and reverse strands 7a and 7b partially surrounding these rollers according to the path determined by the latter. In particular, it can be seen that the most distant rollers, respectively 8b for the belt 6, 9d for the belt 7, are arranged so that each of the envelopes 2 is distributed at the end of the conveyor 5 towards a stacking head 10, the latter being designed so as to drive these envelopes one by one, by positioning them suitably in the dihedral formed by the support 3 and the edge 4.

La tête d'empilage 10 est supportée par un chariot mobile 11 comportant latéralement un rebord 12 entourant le côté du support 3 de telle sorte que le déplacement du chariot puisse s'effectuer parallèlement à l'arête du dièdre de référence précité, au fur et à mesure de la formation de la pile et en particulier des variations d'épaisseur de celle-ci. Ce déplacement est notamment réalisé, de façon en elle-même connue, au moyen d'une courroie crantée 13, guidée sur des rouleaux dentés 14 dont l'un au moins est entraîné par un motoréducteur 15 porté par le chariot. A noter que le chariot 11 s'étend transversalement vis-à-vis de la tête 10 de manière à assurer le support des galets de guidage des courroies 6 et 7 qui se déplacent ainsi avec le chariot, le convoyeur 5 étant muni de moyens (non représentés) permettant en permanence de reprendre le mou des courroies selon la position du chariot.The stacking head 10 is supported by a movable carriage 11 having laterally a flange 12 surrounding the side of the support 3 so that the movement of the carriage can be carried out parallel to the edge of the aforementioned reference dihedron, as and as the stack is formed and in particular variations in thickness thereof. This movement is in particular carried out, in itself known manner, by means of a toothed belt 13, guided on toothed rollers 14, at least one of which is driven by a geared motor 15 carried by the carriage. Note that the carriage 11 extends transversely with respect to the head 10 so as to support the guide rollers of the belts 6 and 7 which thus move with the carriage, the conveyor 5 being provided with means ( not shown) permanently allowing the slack in the belts to be taken up according to the position of the carriage.

La pile d'enveloppes 2 est ainsi formée entre la tête d'empilage 10 et un bâti 16 schématiquement représenté sur la figure 1, permettant d'extraire une à une ces enveloppes hors de cette pile, soit avec une séparation donnée entre chacune des enveloppes comme illustré sur le dessin, soit en formation tuilée régulière où ces enveloppes se chevauchent mutuellement sur une partie de leur longueur, les enveloppes étant reprises dans un convoyeur d'évacuation 17 comportant, comme le convoyeur d'amenée 5 au moins deux courroies parallèles 18 et 19 pinçant les enveloppes entre elles, ces courroies étant guidées sur des galets d'axes parallèles 20. Avantageusement, le bâti 16 comporte une tête de dépilage appropriée dont les caractéristiques sont de préférence conformes à celles décrites et représentées dans la demande de brevet N° 91 040 46 déposée le 3 Avril 1991 au nom des demandeurs pour "Dispositif d'extraction un à un d'objets plats à partir d'une pile de tels objets, notamment des enveloppes de lettres".The stack of envelopes 2 is thus formed between the stacking head 10 and a frame 16 schematically represented in FIG. 1, making it possible to extract these envelopes one by one from this stack, either with a given separation between each of the envelopes as illustrated in the drawing, either in regular tiled formation where these envelopes overlap mutually over part of their length, the envelopes being taken up in a discharge conveyor 17 comprising, like the feed conveyor 5 at least two parallel belts 18 and 19 pinching the envelopes together, these belts being guided on rollers d 'parallel axes 20. Advantageously, the frame 16 comprises an appropriate unstacking head whose characteristics are preferably in accordance with those described and represented in patent application N ° 91,040 46 filed on April 3, 1991 in the name of the applicants for "Device one-by-one extraction of flat objects from a stack of such objects, including letter envelopes. "

La tête d'empilage 10 est constituée au moyen de quatre galets d'axes parallèles disposés selon les sommets d'un losange, les galets 21 et 22 étant prévus selon la grande diagonale de celui-ci et les galets 23 et 24 selon la petite. Les axes des galets 21 et 22 sont portés par le chariot 11 et donc immobilisés en position relative par rapport à ce dernier, tandis que les axes des deux autres galets 23 et 24 sont supportés par une entretoise 25, qui maintient entre ces axes un écartement déterminé.The stacking head 10 is constituted by means of four rollers with parallel axes arranged along the vertices of a rhombus, the rollers 21 and 22 being provided along the long diagonal thereof and the rollers 23 and 24 along the small . The axes of the rollers 21 and 22 are carried by the carriage 11 and therefore immobilized in a relative position relative to the latter, while the axes of the other two rollers 23 and 24 are supported by a spacer 25, which maintains a spacing between these axes determined.

Les Figures 2 à 4 illustrent plus particulièrement la structure des différentes parties du dispositif et notamment de la tête d'empilage 10.FIGS. 2 to 4 illustrate more particularly the structure of the different parts of the device and in particular of the stacking head 10.

Comme on le voit sur ces figures, la tête 10 comporte une courroie d'entraînement 26 tendue sur les quatre galets 21 à 24, l'un des galets dont l'axe est porté par le chariot 11, par exemple le galet 22, comportant un pignon de commande 27, dont la rotation est provoquée au moyen d'une courroie de renvoi 28, elle-même en prise par l'intermédiaire d'un embrayage (non représenté) avec un second pignon 29 claveté ou autrement solidarisé de l'arbre d'un motoréducteur 30, de manière à ce que cette rotation soit synchronisée sur la vitesse d'introduction des enveloppes 2 à la sortie du convoyeur 5. La courroie 26 est réalisée en un matériau présentant un coefficient de frottement approprié, relativement élevé, de telle sorte que, au cours de sa rotation sur les galets 21 à 24, elle entraîne les enveloppes 2 au fur et à mesure que celles-ci se présentent devant elle à la sortie du convoyeur 5 entre les brins 6a et 7a des courroies 6 et 7, au droit des galets 8b et 9d comme représenté sur la Figure 4 notamment. En outre, les axes des galets 21 et 22 sont disposés de telle sorte que les enveloppes 2 qui se placent dans le fond du dièdre de référence fassent avec la bande un angle limité mais déterminé.As can be seen in these figures, the head 10 comprises a drive belt 26 stretched over the four rollers 21 to 24, one of the rollers whose axis is carried by the carriage 11, for example the roller 22, comprising a control pinion 27, the rotation of which is caused by means of a return belt 28, itself engaged by means of a clutch (not shown) with a second pinion 29 keyed or otherwise secured to the shaft of a geared motor 30, so that this rotation is synchronized on the speed of introduction of the envelopes 2 at the outlet of the conveyor 5. The belt 26 is made of a material having an appropriate coefficient of friction, relatively high, so that, during its rotation on the rollers 21 to 24, it drives the envelopes 2 as and when they come before it at the outlet of the conveyor 5 between the strands 6a and 7a of the belts 6 and 7, in line with the rollers 8b and 9d as shown in Figure 4 in particular. In addition, the axes of the rollers 21 and 22 are arranged so that the envelopes 2 which are placed in the bottom of the reference dihedral make with the band a limited but determined angle.

Selon l'invention, les deux galets 23 et 24, réunis par l'entretoise d'écartement 25 et disposés selon la direction de la petite diagonale du losange dont les côtés sont délimités par la bande 26, sont montés de telle sorte qu'ils puissent coulisser ensemble parallèlement à cette direction, grâce à un support 31 monté coulissant dans une glissière à billes 32, ménagée à la partie inférieure de ces galets dans la surface en regard du chariot 11. Le support 31 comporte par ailleurs une extension latérale 33 prévue pour coopérer avec une butée 34 agissant sur une jauge de contrainte 35, susceptible d'indiquer, en fonction de sa déformation sous la poussée du support 31, la valeur de la pression exercée sur la pile d'enveloppes et d'agir en conséquence sur le motoréducteur 15 réalisant le déplacement du chariot. Un ressort taré (non représenté) est associé à la butée 34 afin de maintenir en contrainte la jauge 35 tant que la pression sur la pile d'enveloppes ne dépasse pas un seuil maximal déterminé, correspondant à la déformation limite de la jauge, et de laisser échapper celle-ci en cas de surpression éventuelle, sans l'endommager, par exemple en cas de bourrage dans la pile ou de mise en place dans celle-ci d'un objet d'épaisseur excessive.According to the invention, the two rollers 23 and 24, joined by the spacer 25 and arranged in the direction of the small diagonal of the rhombus, the sides of which are delimited by the strip 26, are mounted so that they can slide together parallel to this direction, thanks to a support 31 slidably mounted in a ball slide 32, provided at the lower part of these rollers in the facing surface of the carriage 11. The support 31 also has a lateral extension 33 provided to cooperate with a stop 34 acting on a strain gauge 35, capable of indicating, as a function of its deformation under the thrust of the support 31, the value of the pressure exerted on the stack of envelopes and of acting accordingly on the geared motor 15 carrying out the movement of the carriage. A calibrated spring (not shown) is associated with the stop 34 in order to keep the gauge 35 under stress as long as the pressure on the stack of envelopes does not exceed a determined maximum threshold, corresponding to the limit deformation of the gauge, and allow the latter to escape in the event of overpressure, without damaging it, for example in the event of a jam in the stack or of placing in it an object of excessive thickness.

L'équipement du dispositif se complète au moyen d'une roue à impulsions optiques 36, montée libre en rotation autour d'un axe 37, prévue à l'extrémité d'un bras de support 34, cette roue étant montée à peu près tangentiellement à un plan latéral du losange délimité par la bande d'entraînement 26, et entraînée en rotation permanente par cette dernière de façon à fournir des trains d'impulsions permettant de mesurer le positionnement des enveloppes vis-à-vis d'une référence donnée, afin en particulier de piloter au moyen de ces informations la commande de la tête de dépilage prévue dans le bâti 16 à l'opposé de la tête d'empilage 10 et d'agir notamment sur un mécanisme de rattrapage éventuel.The equipment of the device is completed by means of an optical pulse wheel 36, mounted freely in rotation about an axis 37, provided at the end of a support arm 34, this wheel being mounted approximately tangentially. to a lateral plane of the rhombus delimited by the drive band 26, and driven in permanent rotation by the latter so as to provide trains of pulses making it possible to measure the positioning of the envelopes with respect to a given reference, in particular in order to control by means of this information the control of the unstacking head provided in the frame 16 opposite the stacking head 10 and to act in particular on a possible catch-up mechanism.

Le dispositif proposé permet donc d'effectuer ainsi, de façon continue, la mesure de la pression de la pile d'enveloppes sur la tête d'empilage, une telle information étant indispensable pour la commande précise des mouvements du chariot mobile. La régulation de cette pression est ajustée, de telle sorte qu'elle assure à la fois le maintien de la pile et la préservation d'une adhérence minimale de chaque enveloppe vis-à-vis de la bande d'entraînement, sans gêner à aucun moment son insertion dans celle-ci. Dans ce but, le capteur de pression extensométrique est adapté à fournir des valeurs très précises, même pour une faible déformation de celui-ci, en permettant dès lors de garder pratiquement constant l'angle avec lequel les enveloppes sont introduites dans la tête d'empilage, cet angle constituant un paramètre essentiel pour la constitution et le maintien de la pile, quels que soient le format, l'épaisseur et le poids des enveloppes traitées.The proposed device therefore makes it possible to thus continuously carry out the measurement of the pressure of the stack of envelopes on the stacking head, such information being essential for the precise control of the movements of the mobile carriage. The regulation of this pressure is adjusted, so that it ensures both the maintenance of the stack and the preservation of a minimum adhesion of each envelope with respect to the drive belt, without interfering with any moment its insertion into it. For this purpose, the extensometric pressure sensor is adapted to provide very precise values, even for a small deformation thereof, thereby making it possible to keep practically constant the angle with which the envelopes are introduced into the head. stacking, this angle constituting an essential parameter for the constitution and the maintenance of the stack, whatever the format, thickness and weight of the treated envelopes.

Bien entendu, il va de soi que l'invention ne se limite pas à l'exemple de réalisation plus spécialement décrit et représenté ci-dessus ; elle en embrasse au contraire toutes les variantes.Of course, it goes without saying that the invention is not limited to the embodiment more specifically described and shown above; on the contrary, it embraces all its variants.

Claims (6)

1 - Dispositif pour la formation d'une pile d'objets plats, notamment d'enveloppes de courrier, comportant un convoyeur (5) délivrant les enveloppes (2) une à une, séparées ou avec un recouvrement mutuel de l'une de ces enveloppes à la suivante, et une tête d'empilage (10) portée par un chariot mobile (11) au fur et à mesure de la formation de la pile, ce chariot comportant au moins une bande (26) en un matériau à coefficient de frottement notable, commandée en rotation pour entraîner les enveloppes dans son déplacement, celles-ci se présentant avec un de leurs bords en appui sur un plan horizontal (3) en direction d'un plan vertical de taquage (4) formant avec le plan horizontal un dièdre de référence, caractérisé en ce que la bande de la tête d'empilage est montée sur quatre galets rotatifs disposés selon les sommets d'un parallélogramme déformable, deux sommets (21,22) étant fixes et les deux autres (23,24) étant mobiles mais maintenus à écartement déterminé par une entretoise (25), le déplacement des sommets mobiles s'effectuant en fonction de la pression exercée par la bande sur la pile en formation, mesurée en permanence par un capteur de contraintes (35) agissant sur la commande de déplacement du chariot, parallèlement à l'arête du dièdre de référence. 1 - Device for forming a stack of flat objects, in particular mail envelopes, comprising a conveyor (5) delivering the envelopes (2) one by one, separated or with a mutual covering of one of these envelopes to the next, and a stacking head (10) carried by a movable carriage (11) as the stack is formed, this carriage comprising at least one strip (26) made of a material with a coefficient of significant friction, controlled in rotation to drive the envelopes in its movement, these having one of their edges resting on a horizontal plane (3) in the direction of a vertical jogging plane (4) forming with the horizontal plane a reference dihedral, characterized in that the strip of the stacking head is mounted on four rotating rollers arranged along the vertices of a deformable parallelogram, two vertices (21,22) being fixed and the other two (23,24 ) being mobile but kept at a spacing undermined by a spacer (25), the displacement of the mobile tops taking place as a function of the pressure exerted by the strip on the stack in formation, permanently measured by a stress sensor (35) acting on the movement control of the carriage , parallel to the edge of the reference dihedral. 2 - Dispositif selon la revendication 1, caractérisé en ce que le chariot mobile (11) portant la tête d'empilage (10) est entraîné par une courroie crantée (13) engrénant avec un pignon (14) commandé par un motoréducteur (15), de telle sorte que la rotation de ce pignon au fur et à mesure de la formation de la pile détermine un déplacement en sens inverse du chariot. 2 - Device according to claim 1, characterized in that the mobile carriage (11) carrying the stacking head (10) is driven by a toothed belt (13) meshing with a pinion (14) controlled by a geared motor (15) , so that the rotation of this pinion as the stack is formed determines a movement in the opposite direction of the carriage. 3 - Dispositif selon l'une des revendications 1 ou 2, caractérisé en ce que l'entretoise (25) maintenant à écartement donné les deux galets mobiles (23,24) du parallélogramme, ceux-ci ont leurs axes solidaires d'un support (31) guidé dans une rainure de déplacement (32) prévue dans le châssis du chariot mobile. 3 - Device according to one of claims 1 or 2, characterized in that the spacer (25) now given spacing the two movable rollers (23,24) of parallelogram, these have their axes integral with a support (31) guided in a displacement groove (32) provided in the chassis of the mobile carriage. 4 - Dispositif selon la revendication 3, caractérisé en ce que le support (31) des galets coopère avec une glissière à billes montée, dans la rainure de déplacement (32). 4 - Device according to claim 3, characterized in that the support (31) of the rollers cooperates with a ball slide mounted in the displacement groove (32). 5 - Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'une butée (34) à ressort taré est associée au capteur de contraintes (35) afin de permettre, lorsque la pression sur la pile dépasse un seuil maximal donné, le déplacement des galets mobiles (23,24) et le dégagement du chariot portant la tête d'empilage. 5 - Device according to any one of claims 1 to 4, characterized in that a stop (34) with calibrated spring is associated with the stress sensor (35) in order to allow, when the pressure on the stack exceeds a maximum threshold given, the displacement of the movable rollers (23,24) and the disengagement of the carriage carrying the stacking head. 6 - Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il comporte une roue à impulsions (36) montée sensiblement tangente au plan de la bande (26), de telle sorte que les enveloppes provoquent la rotation de cette roue lors de leurs déplacements avec la bande, la roue fournissant alors un train d'impulsions caractérisant le positionnement de ces enveloppes préalablement à leur introduction dans la pile. 6 - Device according to any one of claims 1 to 5, characterized in that it comprises a pulse wheel (36) mounted substantially tangent to the plane of the strip (26), so that the envelopes cause the rotation of this wheel during their movements with the strip, the wheel then providing a train of pulses characterizing the positioning of these envelopes prior to their introduction into the stack.
EP92400877A 1991-04-04 1992-03-30 Device for forming a pile of flat objects, particularly for postal envelopes Withdrawn EP0507662A1 (en)

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FR9104106 1991-04-04
FR9104106A FR2674837B1 (en) 1991-04-04 1991-04-04 DEVICE FOR FORMING A STACK OF FLAT OBJECTS, ESPECIALLY MAIL ENVELOPES.

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FR2674837B1 (en) 1993-07-30
US5224697A (en) 1993-07-06

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