EP2714527B1 - Coupeuse de sac automatique, et procédé d'utilisation associé - Google Patents

Coupeuse de sac automatique, et procédé d'utilisation associé Download PDF

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Publication number
EP2714527B1
EP2714527B1 EP12793607.8A EP12793607A EP2714527B1 EP 2714527 B1 EP2714527 B1 EP 2714527B1 EP 12793607 A EP12793607 A EP 12793607A EP 2714527 B1 EP2714527 B1 EP 2714527B1
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EP
European Patent Office
Prior art keywords
bag
star wheels
spike
wheels assembly
assembly
Prior art date
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Not-in-force
Application number
EP12793607.8A
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German (de)
English (en)
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EP2714527A1 (fr
EP2714527A4 (fr
Inventor
Francois Caron
Navam Jagan
Patrice Lasnier
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Luxme Holding Inc
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Luxme Holding Inc
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Publication date
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Publication of EP2714527A1 publication Critical patent/EP2714527A1/fr
Publication of EP2714527A4 publication Critical patent/EP2714527A4/fr
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Publication of EP2714527B1 publication Critical patent/EP2714527B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B69/00—Unpacking of articles or materials, not otherwise provided for
    • B65B69/0008—Opening and emptying bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B69/00—Unpacking of articles or materials, not otherwise provided for
    • B65B69/0033—Unpacking of articles or materials, not otherwise provided for by cutting

Definitions

  • This invention generally relates to a bag opening machine of the kind which receives bags, in the form of sacks made from paper or sheet plastics material, and feeds them past means for cutting the bags to permit them to be opened for emptying.
  • known bag slitting machines usually cannot be washed or dried without any impurities left over.
  • the male cam rollers enter and exit the full loaded bag slitting and emptying chamber, and slide over the stationary female cams, thus undesirably creating conditions for accidental contamination of the product released from the bag.
  • bag slitting machines are complex, including many nuts and bolts, gaskets, PVC belting, washers, and others, which increase the risk of maintenance downtime.
  • a further object of the present invention is to improve upon the bag opening machine disclosed in United States patent N° 4 504 183 issued March 12, 1985 to JSK Company Ltd (inventors Stewart Bennison and Ronald Linnik), on which the preamble of claim 1 is based.
  • an automatic bag slitter preferably made of modular assemblies including: a spike star wheels assembly module, which can be slid in and out of the machine as one complete assembly; an infeed conveyor assembly module, which can be slid in and out of the machine as one complete assembly; a compactor module, which can be slid in and out of the machine as one complete assembly; and a vibrating screen and hopper module, which can also be slid in and out of the machine as one complete assembly.
  • the automatic bag opening and slitting machine has a spike star wheels assembly comprising either of one or a combination of star wheels or cylindroid drum like object.
  • the star wheels assembly is provided with spikes which convey a bag, impaled on the spikes when in an extended position, and extends beneath rotary cutting disks driven by two independent pneumatic or electric motors, that may make a continuous cut around three sides of the bag, so that after cutting thereof, the bag comprises two halves joined only at the rear or trailing side of the bag.
  • This invention provides more particularly a machine for opening, cutting and emptying bags filled with granular/powder material and the like.
  • This machine comprises a conveyor in the form of a star wheels assembly equipped with a spike bar rotatably mounted thereon, the spike bar having integral spike members which can be extended radially outwardly from and retracted radially inwardly of the conveying surface of the star wheels assembly and means for feeding a bag to be opened and emptied to the star wheels assembly, which is arranged: (i) to convey the bag (impaled on the spikes thereof -when in their radially extended positions) to and past cutting means which act to make a continuous cut around three sides of the bag so that after cutting thereof, the bag comprises two halves joined only at the rear or trailing side of the bag; (ii) to allow the two halves of the bag to unfold as the half thereof engaged by said spike members is drawn to the forward end of the conveyor, thus enabling full emptying of the contents of the bag into receiving means therefor, and (iii)
  • This machine is characterized by the use of modular type spike conveyor assembly with single axle to which are journaled multiple star wheels, spacedly from one another.
  • a module is provided for cutting and emptying full loaded bags containing food products.
  • a further module is provided for emptying bags wherein the material inside the bag is treated in a controlled and/or sanitary and/or aseptic environment, not excluding a negative pressure environment to prevent accidental release of hazardous material inside the machine, or positive pressure environment to prevent accidental ingress of contaminating external material.
  • an improved bag cutting knife arm assembly an improved cam design, an improved bag separation guide bar; and an improved modular type impaling spikes assembly.
  • the invention relates to a bag opening and emptying machine for cutting bags inside a controlled environment bag slitting chamber, said machine comprising: a star wheels assembly, including rotatable integral shaft transversely carrying a set of star wheels spaced from one another, wherein a spacer gap is formed between each pair of successive said star wheels along said shaft, spike means mounted within corresponding said spacer gaps and extendible radially outwardly from and retractable radially inwardly of the periphery of said star wheels assembly, means for feeding a bag into the controlled environment chamber and onto a conveying surface of said star wheels assembly; means for extending said spike means radially outwardly of said star wheels assembly so as to impale the bag and firmly secure the latter to said star wheels assembly; cutting means adjacent the star wheels assembly past which the bag is conveyed in a conveying direction and which serve to make a continuous cut around three sides of the bag whereby the bag is cut into upper and lower halves hingedly joined at the rear or trailing side of the bag; the star wheels
  • the star wheels assembly is located beneath the path over which the bags travel during ingress from said means for feeding a bag and into said chamber, said star wheels assembly unfolding the two halves of the bag by drawing the half thereof engaged by said spike means over said star wheel assembly, and further including screen means to support the upper half of the bag as the bag is fed over the star wheels assembly and before it is drawn to follow the lower half around said star wheels assembly.
  • a number of radially outwardly opening notches could be formed at the periphery of each of said star wheels, and actuator rods each extending through registering said notches from corresponding successive said star wheels, said actuator rods cooperating with said spike means, with said means for extending the spike means, and with said means for retracting said spike means.
  • Said actuator rods could be rotatably mounted relative to said star wheels, and wherein said spike means are arcuate hooks, each of the latter having a sharp leading edge, said notches and associated actuator rods distributed on successive peripheral quadrants of each of said star wheels.
  • said means for extending said spike means and said means for retracting said spike means consist of female cam means and resilient means urging said actuator rods to a position where the arcuate hooks protrude radially outwardly from the conveying surface, and a cam roller associated with each said actuator rod, each said cam roller cooperating with said female cam means such that the actuator rods are rotated against the action of said resilient means to retract said arcuate hooks and subsequently release said arcuate hooks at required positions in a closed loop.
  • Said star wheels assembly could form a modular component slidably mounted in and out of the controlled environment bag slitting chamber, for facilitating maintenance thereof.
  • Said cutting means could include either two electric or two pneumatic drive motors spaced from one another, each of said motors driving a shaft carrying a rotatable blade, each drive motor supported into said chamber, each such motor, shaft and blade located in an operative condition thereof inside said chamber.
  • said cutting means comprises two cutters which are arranged for movement inside said chamber in a conveying direction and laterally to said conveying direction to opposite sides respectively of said star wheels assembly, including resilient means which act to urge the cutters inwardly, one of said cutters being located behind the other in said conveying direction whereby each cutter engages each bag in cutting relationship in precisely the same position on the bag surface to ensure a continuous cut around three sides of the bag.
  • Each cutter may comprise a discoid cutting blade disposed in a plane parallel with an upper bag conveying surface of said star wheels assembly.
  • air jet means mounted either in said star wheels assembly or in the rocker assembly, in closely spaced fashion relative to the downstream quadrant of said star wheels assembly and for engaging an inside surface of the bag as it is unfolded and emptied.
  • At least some of said spike means could include arcuate hooks, angled in said conveying direction and wherein said bag conveying surface of said star wheels assembly extends substantially horizontally and immediately downstream of said cutting means.
  • said cutting means drive motors, shafts and blades form a unitary modular component slidably mounted in and out of said controlled environment bag slitting chamber, for facilitating maintenance thereof.
  • a rocker type guide bar frame is pivotally mounted into a downstream portion of the controlled environment bag slitting chamber, said guide bar frame registering with said conveying surface of star wheels assembly and enhancing bag separation after said bag is cut by said cutting means, said rocker type guide bar frame forming a module releasably mounted into said chamber wherein maintenance of said guide bar frame is facilitated when released from said chamber.
  • Such guide bar frame could be selected from the group comprising a cross-sectionally triangular shape frame and a cross-sectionally T-shape frame, and preferably incorporating integral air outflow jet nozzles.
  • said collection means for the empty bag consists of a bag collection chute, mounted beneath said star wheels assembly, and a powered endless screw system, operating within a compaction tube and pushing the empty bag away from said chamber toward a reclaim area, said endless screw system extruding the bag into another chute where the emptied bags are compacted and pushed into a waste plastic tube.
  • Said cam means could be a female cam groove, made into an anchor plate at one end of said star wheels assembly, said female cam groove engaged by said cam roller.
  • said receiving means consists of a collection hopper, mounted into said chamber beneath said star wheels assembly, and a fine mesh screen, mounted within said hopper.
  • said guide bar frame includes a hollow elongated frame element having a series of lengthwisely spaced openings, the latter opening forming air outflow nozzles, and further including a pressurized air source feed means operatively connected to said guide bar frame element and enabling pressurized air ejection outwardly therefrom through said air outflow nozzles.
  • the invention also relates to a method of slitting open a bag with a bag opening and emptying machine of the above-noted type, wherein the method comprises the following steps: actuating said means for feeding a bag and feeding a bag into said chamber; actuating said means for extending said spike members and holding in position said loaded bags with the spike members from the spike star wheels assembly; actuating said cutting means that slit open the loaded bag with the cutting performed on three sides of the bag; rotating said star wheels assembly shaft in the conveying direction, when holding steady the bottom of the bag by the spike members, while drawing the bag around the star wheels assembly, wherein the bag is turned inside out and the material inside the bag is discharged by gravity; sifting the material from the bag; and compacting the emptied bag.
  • full bags G (containing powder or granular material) to be opened and emptied are fed into the automatic bag slitting machine 20 by an infeed roller conveyor C, which transfers them to a spiked star wheels assembly 22, which carries them through a cutting station, generally indicated at A, and to an emptying station, generally indicated at B. Precise positioning and orientation of the bags on conveyor C and of star wheels assembly 22 is not required as will become apparent hereinafter.
  • At the cutting station A are two rotatable cutting blades or discs 24 and 26, disposed in a common horizontal plane and mounted for rotation on vertically extending shafts 28 and 30 respectively, rotatably driven in direct drive by motors 40, 42, respectively.
  • Motors 40, 42 are preferably pneumatic (air driven), while not excluding as alternate embodiment electric motors 40', 42' ( fig 11 ), and are carried by L-shape arms 44 and 46 for relative movement about bearing mounts 34, 36, journaled into a registering wall section of the large housing 32 ( figures 14-15 ) enclosing the present machine components.
  • Pneumatic type motors 40, 42 are preferred, in particular in case the bags G enclose foodstuff or hazardous (e.g. inflammables or explosives) powder or granular material.
  • Conveyor C has an inner portion, extending into the machine housing 32, and an external portion, extending outwardly from the machine housing 32. As illustrated, the downstream end portion of bag conveyor C comes in generally vertical register with the overhanging cutting station A, closely spaced from the top section of star wheels assembly 22. Also, downstream cutter 26, 42, comes in vertically overhanging register with the top surface of star wheels assembly.
  • Arms 44 and 46 are free to turn about the axes of the bearing mounts 34, 36.
  • the arms 44 and 46 are urged inwardly and rearwardly by resilient tension spring means 400 (see figures 16 to 19E , and as generally disclosed in prior art US patent 4 504 183 , supra), to position the cutting discs 24 and 26 substantially centrally of the path along which the bags G are conveyed by the conveyor C and star wheels assembly 22.
  • Tension spring means 400 preferably consists of piano wire, air cylinder, or gas spring means. Spring means 400 keep knife pressure on the bag G as the bag advances through the cutting station A, wherein the knives 24, 26, cut the bag G. As bag G clears cutting area A, spring means 400 bring cutters 24, 26 into their initial unbiased condition of figure 2 , in spring back fashion.
  • one of the support arms, here 46 is positioned downstream of the other (upstream) arm 44, for reasons which will be discussed hereinafter.
  • the star wheels assembly 22 is formed from a number (for example six) of transversely extending star wheels 60, 60A, 60B, ... transversely journaled by a single shaft 62.
  • Two anchor plates 61, 61A are transversely fixedly secured to opposite ends of shaft 62 spacedly from the star wheels.
  • Shaft 62 is supported at opposite ends by bearing mounts 63 on two opposite upright walls 32A, 32B ( fig 15 ) of the present machine housing 32 enclosing the controlled environment bag cutting chamber 67.
  • Shaft 62 is directly driven by a gear reducer motor 66 ( figures 7 and 15 ).
  • Each star wheel 60, 60A, ... is rotatable with shaft 62 and a few (for example five) radially outwardly opening notches 68, 70, 72, ... are formed radially outwardly of each discoid star wheel 60, 60A, ...
  • Each of the notches 68 of star wheels 60 coaxially register with one registering notch 68 for each of the other star wheels 60, 60A, so that a spike bar 74 can extend transversely through all star wheels 60 axially of notches 68 and generally parallel to star wheel shaft 62.
  • corresponding number of spike bars 74 engage corresponding sets of notches 68.
  • Spike bars 74 are rotatably carried at opposite ends into cavities 75 made in the anchor plates 61, 61 A.
  • a number (for example four) arcuate spikes 76, 76A, 76B, ... are integrally carried in lengthwisely spaced fashion to each spike bar 74.
  • Spikes 76 are sized to fit in the spacing gap between each corresponding successive pair of star wheels 60, 60A, ...
  • each spike bar 74 is transversely mounted a lever 81 ( figs 10, 10A ).
  • Lever 81 carries a cam roller 80 opposite spike bar 74.
  • cam roller 80 is replaced by a cam follower (not shown).
  • Spike bar 74 is provided endwisely with a cam roller 80, it is rotatable independently of and relative to star wheel 60.
  • Cam means 83 are formed by the interplay of lever 81, cam roller 80 and a female cam groove 65 in anchor plate 61.
  • cam means 83 allows the elbowed sharp tip portion 77 of spikes 76 to spring outwardly to impale the bags at the downstream end of the star wheels assembly 22.
  • the automatic bag slitter 20 is designed to slit open and empty full bags G containing different types of material, in particular granular or powder material, food, feed, chemical and other product, hazardous or non-hazardous, explosive or non-explosive, packaged in paper bags, plastic bags, polywoven bags, burlap bags, jute bags and other packages in bags or boxes.
  • An operator loads the full bags G (loaded with powder/granular material) onto the infeed conveyor C which convey the loaded bags to the spike star wheels assembly 22, where the bags are spiked and held in position during the slitting cycle.
  • the two rotary cutting blades 24, 26, automatically adjust to the different full loaded bag sizes and neatly slit the full bag G on three sides for a thorough gravity discharge of the product content thereof inside the bag.
  • the bottom of the emptied bag, G' is firmly held by the spikes 76 and is drawn around and under the spike star wheels assembly, in one long sheet. In the process, the empty bag G' is turned inside out and the product P is discharged by gravity. Empty bag G' engages a bag separation guide rocker 110 ( fig 13A ), which starts to tilt in a downstream downwardly oriented direction.
  • Bag separation guide rocker 110 tilts away about pivot 111 from spike star wheels assembly 22, guiding spent bag G downwardly along the downstream and bottom quadrant periphery of the star wheels assembly 22, clearing the top mouth 112A of hopper 112, toward an empty bag collector compactor chute 118 equipped with an endless screw 120 powered by motor 121(located outside of chamber 32) for remote reclaim.
  • bags G are fed by the infeed conveyor C towards the rotatable star wheels assembly 22.
  • spikes 76, 76A, ... approach the underside of bags G so conveyed, the spikes they are radially outwardly tilted by disengagement of the cam rollers 80 from the female cam groove 65 to impale themselves through the bag G under the action of torsional springs (not shown) and carry the bag forwardly through the cutting station A.
  • the position of male/female cam rollers 80/grooves 65 could be inverted, without affecting the scope of the present invention.
  • the bag G thus encounters the upstream cutting disc 24 which penetrates the bag envelope and which is then forced laterally by continued progress of the bag G to cut half of the leading edge of the bag and down one side of the bag.
  • the upstream cutting disc 24 has begun to move laterally, the bag G is brought into engagement with the downstream cutting disc 26 at precisely the same position as the upstream cutting disc 24 first contacted the bag.
  • the downstream cutting disc 26 is forced forwardly and laterally by continued progress of the bag to complete the cut through the leading edge of the bag and down the other side of the bag.
  • the lowermost portion of the envelope of the bag which is securely impaled on the spikes 76 is pulled downwardly from the remainder of the bag G' which is supported as it is fed over the star wheels assembly before it is drawn downstream to follow the lower part of the bag by a rocker type bag separation guide bar assembly 110 (see also figures 15A and 15B ) spacedly overlying a collection hopper 112 into which the contents of the bag fall.
  • the envelope of the bag G' is conveyed by the spiked star wheels assembly 22.
  • the bag envelope is conveyed downstream and released from the spiked star wheels assembly 22 by retraction of the spikes 76, to fall into bag collection chute 118 equipped with powered endless screw 120 which serves to compact and convey the empty bag G to suitable disposal means, such as a collection sack or the like.
  • the infeed conveyor C is arranged to run at such an adjustable speed as to be suitable for different applications/constructions/configurations of the bag G' to match the star wheels assembly 22, whereby the machine will be able to handle, without interruption, a continuous supply of bags from the infeed conveyor C.
  • the cutter station shafts 28 and 30 are preferably adjustable as to height relative to the arms thereof 44 and 46, to enable the machine to be set up to deal with bags of different size.
  • the cutting discs 24 and 26 should always be at the same horizontal plane level to ensure that they each engage the bag G in turn at an identical position to ensure a continuous cut around the bag, facilitating the full emptying of its contents as the undersurface of the bag envelope is peeled from the remainder at the emptying station.
  • Figure 7 shows the present improved spike conveyor assembly comprising the following features:
  • FIGs 8 and 9 illustrate the travel path of a single spike 76 as the star wheels assembly 22 rotates with its shaft 62 through one full turn by going through four successive quadrants of the star wheels assembly.
  • the improved automatic bag slitter 20 is strictly based on the engineering theory explained below. This theory applies to the spike star wheels assembly 22 and its operation through one complete rotation and the repeatability function for continuous operation with minimal expected downtime. The spike movement during one complete rotation cycle of the star wheels assembly 22 is schematically shown in these figures.
  • the spike star wheels assembly 22 rotates clockwise using its shaft 62 as the centre point; the spike bars 74 and their orbital path follow arrows ABC (spike shaft assembly travel) as shown in figure 9 .
  • the cam rollers 80 ( figs 10, 10A ) engage and follow the stationary groove or female cam, 65, in anchor plates 61, and provide the trajectory for the travel of spike sharp elbowed tip 77.
  • the spike bar 74 is a rod or a bar or a tube. Spikes 76 project radially outwardly from bar 74, and are welded to the rod 74 or bar or tube. At one end of the bar 74, lever 81 carries cam roller 80. Inside the machine 20, only the spikes 76 and the spike bar 74 are exposed, thus there is no hardware used. Inside the machine 20, the spike bar 74 is totally washable. The bar 74 could also be made out from plastic or polymer and/or other metal.
  • the improved knife assembly comprises an electric motor 40, 42, mounted directly to the knife arm 44, 46.
  • donuts may be used to follow the contour of the full loaded bags.
  • pneumatic (pressurized air) driven motors 40', 42' may be used (replacing electric motors 40, 42).
  • the entire system is completely washable. The system is safe enough to be usable for food grade applications, although non foodgrade applications are not excluded.
  • the cam means 83 is made from cam roller 80, lever 81, and a female cam or groove 65 made in fixed anchor plate 61.
  • Cam means 83 projects outside of the bag cutting and emptying chamber inside the housing 32 enclosing the bag slitting and emptying chamber 20.
  • Cam means 83 is thus an integral part of the spike star wheel assembly 22, but externally located relative to the controlled environment bag cutting and emptying chamber 32.
  • the (male) cam rollers 80 thus engage and follow the (female) cam groove 65 and provide a full rotational capability. All of the cam assembly 83, is entirely located outside of the bag slitting and emptying chamber, and thus provide a completely safe food grade environment for food applications if required, without the hazard of accidental food product contamination when the bag is opened.
  • torsional springs may be used to drive the spike in addition to/or as a replacement of the force given by the path of the cam means 83.
  • the improved guide bar assembly 110 shown in figure 13A is one single complete component manufactured without any hardware or springs.
  • a rocker bag separation guide bar 111 is pivoted at the opposite upright walls 32A, 32B of the machine housing 32.
  • a flat grate 114 is fixedly mounted to pivotal guide bar 111 by two pairs of opposite inversely V-shape brackets 116, 118.
  • the whole guide bar assembly 110 can be removed very easily from housing 32, and cleaned and washed.
  • Guide bar assembly 110 is preferably manufactured out of carbon steel, stainless steel, or plastic/polymer; and out of tubing, bars or rods.
  • Grate 114 includes an upstream elongated hollow tube 115 having a number of lengthwisely spaced bores 115A.
  • a pressurized air source is fluidingly connected to tube 115, for providing air outflow at F. Air flow F cleans passing bags G, as suggested in figure 4 .
  • a flat grate member 152 is supported by two opposite L-shape brackets 154, 156, these brackets 154, 156 being pivotally mounted to opposite pivot mounts in upright walls 32A, 32B of the machine controlled environment bag cutting machine chamber housing 32.
  • Figures 14 and 15 suggest that for foodgrade application at cleaning mode of the star wheel assembly 22, this modular spike star wheel assembly can be slid outwardly of the machine controlled environment housing 32 for inspection, maintenance and cleaning, along a telescopic support sliding rack 300.
  • Rack 300 includes a stationary portion 302, permanently mounted inside housing 32, and a telescopically extendable portion 304, movable from a first limit position overlying the stationary portion 302, to a second limit position fully or almost fully extended outwardly from housing 32, for maintenance access.
  • dust filter means are provided about access areas of the machine housing 32, to enhance atmospheric control of air borne contaminants of the controlled environment bag slitting chamber.
  • the components inside of the machine are designed to be modularly mounted therein: the infeed conveyor C, the spike star wheels assembly 22, the rocker bag separation bar assembly 110 or 150, and the cutter assembly A. All of these modular components are easily removable manually without tools, for cleaning and general maintenance.
  • the inside of the machine housing 32 also preferably meets the clean-in-place (CIP) standard.
  • CIP clean-in-place
  • the empty bag compactor 118, 120 may also slide out of the machine housing 32 in the same way as the spike star wheels assembly 22.
  • the integral dust filter may be modular, with the filter cartridge being easily removed.
  • the weight load of powder/granular material inside the full bag G should most preferably range within approximaly 2.27 to 113,40 kg (5 to 250 pounds).
  • star wheels 60, 60A, 60B, ... of star wheels assembly 22 could be replaced by any other suitably designed disc-like or drum like element or object, hollow or solid, while remaining well within the scope of the present invention.
  • a drum like star wheel element would not be optimal in view of the requirement of guaranteeing a contamination free environment inside the bag opening and slitting machine of the present invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Refuse Collection And Transfer (AREA)

Claims (19)

  1. Une machine (20) d'ouverture et de vidage de sac pour couper des sacs (G) à l'intérieur d'une chambre à environnement contrôlé pour la coupe de sacs, ladite machine comprenant:
    un agencement de roues en étoile (22), ayant un arbre solidaire pouvant tourner (62),
    des moyens (C) pour amener un sac dans la chambre à environnement contrôlé et sur une surface de convoyage dudit agencement de roues en étoile;
    des moyens de coupe (A) adjacents à l'agencement de roues en étoile au-delà desquels le sac est transporté dans une direction de convoyage et qui sert à réaliser une coupe continue sur trois côtés du sac de sorte que le sac soit coupé en des moitiés supérieure et
    inférieure articulées sur le bord de fuite du sac;
    ledit agencement de roues en étoile (22) définissant des quadrants périphériques;
    des moyens de réception (112) pour ramasser le contenu du sac;
    des moyens de récupération (B) pour le sac vide;
    caractérisé en ce que :
    ledit agencement de roues en étoile (22) comprend une série de roues en étoile (60, 60A, 60B, ...) transversalement supporté par ledit arbre (62) et espacées les unes des autres,
    de sorte qu'un intervalle d'espacement soit formé entre chaque paire desdites roues en étoile successives le long dudit arbre (62),
    des moyens de perforation (76, 76A, 76B, ...) pouvant s'étendre radialement vers l'extérieur montés à l'intérieur desdits intervalles d'espacement correspondants et pouvant s'étendre radialement vers l'extérieur à partir de et se rétracter radialement vers l'intérieur dans les intervalles d'espacement entre les roues en étoile consécutives (60, 60A, ..);
    comprenant en outre des moyens (61, 65, 80, 81) pour étendre lesdits moyens de perforation (76, 76A, 76B, ...) radialement vers l'extérieur dudit agencement de roues en étoile pour empaler le sac (G) et pour l'attacher fermement audit agencement (22) de roues en étoile;
    l'agencement de roues en étoile (22) servant à transporter une moitié du sac empalé par les moyens de perforation alors que l'autre moitié se déplie pour libérer le contenu du sac,
    comprenant en outre des moyens (61, 65, 80, 81) pour rétracter lesdits moyens de perforation (76, 76A, 76B, ...) pour libérer le sac vide (G') de l'agencement de roues en étoile;
    un certain nombre de crans d'ouverture (68), s'ouvrant radialement vers l'extérieur formés à la périphérie de chacune desdites roues en étoile (60, 60A, ...); et
    des tiges d'actionnement (74) étant fournies, chacune traversant lesdites encoches (68) y venant vis-à-vis à partir desdites roues en étoile correspondantes successives (60, 60A, 60B), lesdites tiges d'actionnement coopérant avec lesdits moyens de perforation (76, 76A, ...) avec lesdits moyens (61, 65, 80, 81) pour étendre les moyens de perforation, et avec lesdits moyens (61, 65, 80, 81) pour rétracter lesdits moyens de perforation.
  2. La machine d'ouverture de sacs selon la revendication 1,
    dans laquelle l'agencement de roues en étoile (22) est situé au-dessous du trajet sur lequel les sacs (G) se déplacent au cours de l'entrée à partir desdits moyens (C) pour amener un sac et dans ladite chambre, ledit agencement de roues en étoile dépliant les deux moitiés de sac en tirant la moitié de celui-ci engagée par lesdits moyens de perforation (76, 76A) sur ledit agencement de roues en étoile, et comprenant en outre des moyens de tamis (S) pour soutenir la moitié supérieure du sac lorsque le sac est alimenté sur l'agencement de roues en étoile et avant qu'il ne soit attiré pour suivre la moitié inférieure autour dudit assemblage de roues en étoile.
  3. La machine d'ouverture de sacs selon la revendication 1,
    dans laquelle lesdites tiges d'actionnement (74) sont montées de manière rotative par rapport auxdites roues en étoile (60, 60A, 60B), et dans laquelle lesdits moyens de perforation sont des crochets en forme d'arc (76, 76A, ...), chacun de ces derniers ayant un bord d'attaque aiguisé (77), lesdites encoches (68) et les tiges d'actionnement y associées (74) étant distribuées sur des quadrants périphériques successifs de chacune desdites roues en étoile.
  4. La machine d'ouverture de sacs selon la revendication 3,
    dans laquelle lesdits moyens (61, 65, 80, 81) pour étendre lesdits moyens de perforation et lesdits moyens (61, 65, 80, 81) pour rétracter lesdits moyens de perforation sont constitués par des moyens de came femelle (65, 83) et des moyens élastiques (400) sollicitant lesdites tiges d'actionnement (74) vers une position dans laquelle les crochets arquées (76, 76A, ...) font saillie radialement vers l'extérieur à partir de la surface de convoyage (C), et un galet de came (80) associé à chaque dite tige d'actionnement, chacun desdits galets de came coopérant avec lesdits moyens de came femelle de manière à ce que les tiges d'actionnement soient entraînés en rotation contre l'action desdits moyens élastiques pour rétracter lesdits crochets en forme d'arc et ensuite libérer lesdits crochets en forme d'arc au niveau des positions requises dans une boucle fermée.
  5. La machine d'ouverture de sacs selon la revendication 3,
    dans laquelle ledit agencement de roues en étoile (22) forme une composante modulaire montée coulissante dans et hors de la chambre de coupe de sac à environnement contrôlé, pour en faciliter la maintenance.
  6. La machine d'ouverture de sacs selon la revendication 1,
    dans laquelle lesdits moyens de coupe (A) comprennent deux moteurs (40, 40', 42, 42') choisis parmi le groupe comprenant des moteurs d'entraînement électrique et pneumatique, lesdits deux moteurs étant espacés l'un de l'autre, chacun desdits moteurs entraînant un arbre (28, 30) portant une lame rotative (24, 26), chaque moteur d'entraînement supporté dans ladite chambre, chaque tels moteur, arbre et lame se trouvant dans une condition de fonctionnement à l'intérieur de ladite chambre.
  7. La machine d'ouverture de sacs selon la revendication 1,
    dans laquelle lesdits moyens de coupe (A) comprennent deux lames (24, 26) qui sont agencées pour se déplacer à l'intérieur de ladite chambre dans une direction de convoyage et latéralement à ladite direction de convoyage sur les côtés opposés respectivement dudit agencement de roues en étoile (22), et comprenant des moyens élastiques (400) qui agissent pour contraindre les éléments de coupe vers l'intérieur, et l'un desdits éléments de coupe étant situé derrière l'autre dans ladite direction de convoyage de sorte que chaque élément de coupe vient en prise avec chaque sac (G) en relation de coupe dans la même position sur la surface du sac afin d'assurer une découpe continue autour de trois côtés du sac.
  8. La machine d'ouverture de sacs selon la revendication 7,
    dans laquelle chaque élément de coupe (24, 26) comprend une lame de coupe en forme de disque disposée dans un plan parallèle à une surface (C) supérieure de convoyage des sac dudit agencement de roues en étoile (22).
  9. La machine d'ouverture de sacs selon la revendication 1, comprenant en outre des moyens (115, F) de jet d'air montés dans ledit agencement de roues en étoile de façon espacée étroitement par rapport au quadrant en aval dudit agencement de roues en étoile et pour mettre en prise une surface intérieure du sac comme il est déplié et vidé.
  10. La machine d'ouverture de sacs selon la revendication 1, dans laquelle au moins certains desdits moyens de perforation comprennent des crochets en arc (76, 76A, ...), en angle de ladite direction de convoyage et dans laquelle ladite surface (C) de convoyage de sac dudit agencement (22) de roues en étoile s'étend sensiblement horizontalement et immédiatement en aval desdits moyens de coupe (A).
  11. La machine d'ouverture de sacs selon la revendication 6, dans laquelle lesdits moteurs d'entraînement des moyens de coupe (40, 42, 40', 42') les arbres (28, 30) et les lames (24, 26) forment une composante modulaire unitaire montée de manière coulissante dans et hors de ladite chambre à environnement contrôlé pour la découpe de sacs, pour en faciliter la maintenance.
  12. La machine d'ouverture de sac selon la revendication 1, comprenant en outre un cadre (110, 150) à barre de guidage de type bascule, monté pivotant dans une partie aval de la chambre à environnement contrôlé pour la découpe de sacs, ledit cadre à barre de guidage venant vis-à-vis ladite surface de convoyage (C) dudit agencement de roues en étoile (22) et améliorant la séparation de sac après que ledit sac soit coupé par lesdits moyens de coupe (A), ledit cadre à barre de guidage de type à bascule formant un module monté librement dans ladite chambre de sorte que l'entretien dudit cadre à barre de guidage en soit facilité lorsqu'il est libéré de ladite chambre.
  13. La machine d'ouverture de sac selon la revendication 12, dans laquelle ledit cadre de barre de guidage (110, 150) est choisi parmi le groupe comprenant un cadre (110) de forme triangulaire en section transversale et un cadre (150) de section transversale en forme de T.
  14. La machine d'ouverture de sac selon la revendication 1, dans laquelle lesdits moyens de récupération (B) pour le sac vide sont constitués d'une chute (120) de récupération de sacs, montée sous ledit agencement de roues en étoile (22), et un système de vis sans fin motorisé (118), fonctionnant dans un tube de compactage et poussant le sac vide à l'écart de ladite chambre dans une autre chute vers une zone de récupération, ledit système de vis sans fin extrudant le sac dans cette dernière chute où les sacs vidés (G') sont compactés et poussés dans un tube pour déchets en plastique dans la zone de récupération.
  15. La machine d'ouverture de sacs selon la revendication 4, dans laquelle lesdits moyens de came consistent en une rainure (65) de came femelle, ménagée dans une plaque d'ancrage (61) à une extrémité dudit agencement de roues en étoile (22), ladite rainure de came femelle étant en prise avec ledit galet de came (80).
  16. La machine d'ouverture de sac selon la revendication 1, dans laquelle lesdits moyens de réception sont constitués d'une trémie de collecte (112), montée dans ladite chambre sous ledit agencement de roues en étoile (22), et un tamis à mailles fines, monté à l'intérieur de ladite trémie.
  17. Le sac selon la revendication 16,
    comprenant en outre des moyens induisant une vibration à haute fréquence dudit tamis à mailles.
  18. La machine d'ouverture de sacs selon la revendication 13, dans laquelle ledit cadre à barre de guidage (110, 150) comprend un organe de cadre allongé creux (115) ayant une série d'ouvertures (115A) espacées sur la longueur, ces dernières ouvertures formant des buses de sortie d'air, et comprenant en outre un moyen d'alimentation en air comprimé (F) relié de manière opérationnelle audit organe de cadre à barre de guidage et permettant l'éjection d'air comprimé vers l'extérieur par lesdites buses de sortie d'air.
  19. Procédé de découpe d'un sac (G) pour l'ouvir par une machine (20) d'ouverture et de vidage de sac du type pour couper des sacs à l'intérieur d'une chambre de découpe de sacs à environnement contrôlé,
    caractérisé en ce que le procédé comprend les étapes suivantes:
    fournir la machine d'ouverture et de vidage du sac, ayant un agencement de roues en étoile (22), comprenant un arbre solidaire en rotation (62) transportant transversalement un jeu de roues en étoile (60, 60A, ...) espacées les unes des autres, de sorte qu'un intervalle d'espacement soit formé entre chaque paire desdites roues en étoile consécutives le long dudit arbre;
    des moyens de perforation (76, 76A, ...) montés à l'intérieur desdits intervalles d'espacement correspondants et prolongeables radialement vers l'extérieur à partir de et
    pouvant s'étendre radialement vers l'intérieur de la périphérie dudit agencement de roues en étoile (22),
    des moyens (C) pour amener des sacs configurés pour amener un sac dans la chambre à environnement contrôlé et sur une surface de convoyage dudit agencement de roues en étoile (22);
    des moyens d'extension des moyens de perforation (61, 65 80, 81) configurés pour étendre lesdits moyens de perforation radialement vers l'extérieur dudit agencement de roues en étoile de façon à empaler le sac (G) et à l'attacher fermement audit agencement de roues en étoile;
    des moyens de coupe (A) adjacents à l'agencement de roues en étoile au-delà desquels le sac est acheminé dans une direction de convoyage et qui servent à réaliser une coupe en continu autour de trois côtés du sac de sorte que le sac soit coupé en moitiés supérieure et inférieure articulées sur le bord de fuite du sac (G), l'agencement de roues en étoile servant à transporter la moitié du sac empalé sur les moyens de perforation (76, 76A, ...) alors que l'autre moitié s'en déploie pour libérer le contenu du sac, ledit agencement de roues en étoile définissant des quadrants périphériques, des moyens de réception (112) configurés pour recevoir le contenu du sac,
    des moyens de rétraction (61, 65, 80, 81) des moyens de perforation configurés pour rétracter lesdits moyens de perforation pour libérer le sac vide (G') de l'agencement de roues en étoile,
    des moyens de récupération (B) configurés pour recueillir le sac vide, un certain nombre de crans d'ouverture (68) s'ouvrant radialement vers l'extérieur, formés à la périphérie de chacune desdites roues en étoile (60, 60A, 60B, ..), et des tiges d'actionnement (74) chacune passant à travers lesdites encoches y venant vis-à-vis à partir desdites roues en étoile correspondantes consécutives, lesdites tiges d'actionnement coopérant avec lesdits moyens de perforation (76, 76A, 76B, ..), avec lesdits moyens d'extension des moyens de perforation, et avec lesdits moyens de rétraction des moyens de perforation;
    actionner lesdits moyens (C) pour amener le sac et amener un sac dans ladite chambre;
    actionner lesdits moyens d'extension (61, 65, 80, 81) des moyens de perforation et
    maintenir en position lesdits sacs chargés (G) avec les organes de perforation de l'agencement (22) de roues en étoile à organes de perforation;
    actionner lesdits moyens de coupe (A) qui ouvrent le sac chargé avec la coupe effectuée sur trois côtés du sac;
    faire tourner ledit arbre (62) de l'agencement de roues en étoile, dans la direction de convoyage;
    lorsque les organes de perforation (76, 76A ...) maintiennent solidement le fond du sac,
    tirer le sac autour de l'agencement de roues en étoile (22),
    de sorte que le sac soit tourné à l'envers et que le matériau à l'intérieur du sac puisse être évacué par gravité;
    tamiser le matériau du sac; et
    compacter le sac vidé (G').
EP12793607.8A 2011-05-27 2012-05-24 Coupeuse de sac automatique, et procédé d'utilisation associé Not-in-force EP2714527B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2741247A CA2741247C (fr) 2011-05-27 2011-05-27 Decoupeuse automatique de sac et methode d'utilisation
PCT/CA2012/000497 WO2012162793A1 (fr) 2011-05-27 2012-05-24 Coupeuse de sac automatique, et procédé d'utilisation associé

Publications (3)

Publication Number Publication Date
EP2714527A1 EP2714527A1 (fr) 2014-04-09
EP2714527A4 EP2714527A4 (fr) 2014-12-17
EP2714527B1 true EP2714527B1 (fr) 2016-04-20

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EP (1) EP2714527B1 (fr)
CA (1) CA2741247C (fr)
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CA2741247C (fr) 2017-04-18
WO2012162793A1 (fr) 2012-12-06
WO2012162793A8 (fr) 2014-03-06
EP2714527A1 (fr) 2014-04-09
EP2714527A4 (fr) 2014-12-17
CA2741247A1 (fr) 2012-11-27

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