EP0447375B1 - Dispositif pour prendre des flans de forme tubulaire aplatie, à partir d'un magasin, et pour ouvrir ces flans pendant leur transfert vers une ligne d'emballage pour obtenir des boîtes - Google Patents

Dispositif pour prendre des flans de forme tubulaire aplatie, à partir d'un magasin, et pour ouvrir ces flans pendant leur transfert vers une ligne d'emballage pour obtenir des boîtes Download PDF

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Publication number
EP0447375B1
EP0447375B1 EP91830087A EP91830087A EP0447375B1 EP 0447375 B1 EP0447375 B1 EP 0447375B1 EP 91830087 A EP91830087 A EP 91830087A EP 91830087 A EP91830087 A EP 91830087A EP 0447375 B1 EP0447375 B1 EP 0447375B1
Authority
EP
European Patent Office
Prior art keywords
blank
blanks
respect
turret
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91830087A
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German (de)
English (en)
Other versions
EP0447375A1 (fr
Inventor
Oliviero Benedetti
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.)
CESTINDUE S.R.L.
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CESTINDUE Srl
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 CESTINDUE Srl filed Critical CESTINDUE Srl
Publication of EP0447375A1 publication Critical patent/EP0447375A1/fr
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Publication of EP0447375B1 publication Critical patent/EP0447375B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B65B43/00—Forming, feeding, opening or setting-up containers or receptacles in association with packaging
    • B65B43/26—Opening or distending bags; Opening, erecting, or setting-up boxes, cartons, or carton blanks
    • B65B43/28—Opening or distending bags; Opening, erecting, or setting-up boxes, cartons, or carton blanks by grippers co-operating with fixed supports
    • B65B43/285—Opening or distending bags; Opening, erecting, or setting-up boxes, cartons, or carton blanks by grippers co-operating with fixed supports specially adapted for boxes, cartons or carton blanks
    • 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
    • B65B43/00—Forming, feeding, opening or setting-up containers or receptacles in association with packaging
    • B65B43/12—Feeding flexible bags or carton blanks in flat or collapsed state; Feeding flat bags connected to form a series or chain
    • B65B43/14—Feeding individual bags or carton blanks from piles or magazines
    • B65B43/16—Feeding individual bags or carton blanks from piles or magazines by grippers
    • B65B43/18—Feeding individual bags or carton blanks from piles or magazines by grippers by suction-operated grippers
    • B65B43/185—Feeding individual bags or carton blanks from piles or magazines by grippers by suction-operated grippers specially adapted for carton blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2100/00—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2100/00—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs
    • B31B2100/002—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed
    • B31B2100/0022—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed made from tubular webs or blanks, including by tube or bottom forming operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2100/00—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs
    • B31B2100/002—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed
    • B31B2100/0024—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed having all side walls attached to the bottom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2120/00—Construction of rigid or semi-rigid containers
    • B31B2120/30—Construction of rigid or semi-rigid containers collapsible; temporarily collapsed during manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/74—Auxiliary operations
    • B31B50/76—Opening and distending flattened articles
    • B31B50/80—Pneumatically
    • B31B50/804—Pneumatically using two or more suction devices on a rotating element

Definitions

  • This invention relates to the technical field concerning the machines designed for packaging containers which, during their handling, (closing of the bottom, filling with products, closing of the upper head) are vertically oriented, with reference to their longer dimension.
  • said machines basically comprise:
  • the seatings to receive the blanks of open tubular form are, as mentioned above, with fixed spatial attitude, consisting of drawers or being defined by as many pairs of consecutive blocks, and the magazine is oriented perpendicularly with respect to the longer dimension of the conveyor, with all the problems of encumbrance involved.
  • the lower blank of the pile of blanks contained by the magazine is caught and transferred to said feeding station; during said transfer the blank is unfolded, i.e. it is brought from the flattened tubular form to the open tubular form.
  • the magazines used, associable with said device do not allow the automated loading of blanks, since said pile is subject to the action of elastic means which keep it pressed against the check means in contrast with which the device intermittently catches the blanks.
  • the Applicant invented a device designed to intermittently catch the blanks of flattened tubular form from the bottom of a pile of containers contained by a magazine, and to subsequently transfer the blanks into said seatings, with "unfolding", at least partial, of the same blanks during said transfer.
  • One of the objects of this invention is precisely the provision of a device performing the functions mentioned above, and designed to exploit also the movement of the prongs defining said reception seatings to complete the "unfolding" of the tubular blank, with consequent advantageous effects in terms of productivity of the device itself.
  • a further object of this invention is the provision of a device which, besides the features mentioned above, is suited to act on the lower blank of a pile of blanks located in a magazine, disposed parallel to the longer dimension of the conveyor provided with said pairs of corresponding prongs, with said magazine devised in such a way as to allow the automatic loading of blanks.
  • This device involves positive effects, on one hand, in terms of productivity and on the other hand of reliability of the latter, since the opening of the blank is always assured.
  • the technical solution provided by the present invention allows to take the lower blank of a pile of blanks contained by a magazine disposed parallel to the direction of maximum extension of a conveyor (with substantial reduction of the dimensions of the conveyor-magazine unit and device provided by the invention), with said taking carried out according to a direction perpendicular to the lower blank.
  • the particular conformation of the device provided by the invention allows the employment of a magazine suited to allow the automated loading of blanks.
  • the numeral 1 generally designates a tubular flattened blank, a die-cut blank for instance, of the type defined by four consecutive side walls 2,3,4,5, respectively first, second, third and fourth, mutually articulated, wherein two of them, e.g. the first one 2 and the second one 3, result to be coplanar and fitting together with reference to the remaining walls 4,5; with said walls are articulated relative flaps 2a, 3a, 4a, 5a.
  • the blanks 1 are stacked in a magazine 6 made up of a horizontal portion 6a and a portion 6b, consecutive to the former, inclined downwards.
  • the blanks 1 result to be inclined with respect to the horizontal axis, while in the inclined portion 6b the same blanks are normal to the axis of the latter portion.
  • the lower blank 1a of the pile P of blanks 1 (with said pile contained by the inclined portion 6b) is supported by known elastic check means, not illustrated; the extension of said portion 6b is such as to avoid overloading said elastic means.
  • Said horizontal portion may also be loaded automatically, e.g. by means of automated units; this is made possible by the fact that on said horizontal portion 6a no means to press the pile are required, thus allowing the automated loading, with all the advantages involved.
  • the lower blank 1a of the pile P defines a station S from which the blanks are taken.
  • First means 7 provide for taking the lower blank 1a, and subsequently for transferring it to an intermediate station I where the same blank results to be in horizontal position (fig. 1).
  • Said means 7 are made up of a sleeve 8, hinged in 9 to the supporting structure 50 of the device, with which results to be telescopically coupled a stem 10, whose free end bears sucker means 11 fed in a known way, not illustrated; for the sake of simplicity only a single sucker is illustrated, but it is understood that the number of suckers depends on the surface of the blank 1.
  • the arm 13 is made rocking, according to A1-A2, between two limit positions and vice versa, individuating corresponding positions Z1, Z2, for the sucker 11.
  • the sucker 11 in the position Z1 mates at least a side wall of the blank 1a, e.g. said third wall 4, while in the position Z2 it is horizontal, as well as turned upwards.
  • the rotation of the arm 13 according to A1 initially causes a translation of the stem 10 parallel to the axis of the inclined portion 6b of the magazine (which is extremely advantageous, since it optimizes the disengagement of the lower blank 1a from the elastic means checking the pile P) and, subsequently, a gradual rotation of the same stem with respect to the fulcrum 9, according to A1, combined first with the re-entering and subsequently with the coming out of this latter into and from the sleeve 8.
  • the sucker 11 is in the position Z2 and the blank is positioned, horizontally, in the internediate station I.
  • sucker means e.g. consisting of a sucker 15, associated with second means 16, provide for catching the blank 1, e.g. in correspondence with the first side wall 2, in a suitable relationship of phase with the deactivation of the sucker 11.
  • the means 16 take the blank 1 from the intermediate station I to transfer it subsequently into a vertical seating 45 formed by a pair of prongs 17a, 17b (respectively for catching and for pushing) provided in a container-packaging line 18, whose inner branch 19a and outer branch 19b result to be parallel to the axis of the horizontal portion 6a of the magazine 6.
  • the line 18 is made up of at least two chains 80,81 respectively first and second, running parallel to each other and with the first one overlapping the second one (fig. 2).
  • the first chain 80 bears, equally spaced, the pushing prongs 17b, radially oriented outwards
  • the second chain 81 bears, equally spaced, the catching prongs 17a, in the same number as the former prongs, also radially oriented outwards.
  • a series of vertical seatings 45 is individuated, each of which is defined by at least one catching prong 17a and by at least a corresponding pushing prong 17b; said seatings pass through a feeding station R defined by the initial part of the inner branch 19a of the conveyor 18.
  • said means 16 impart the blank a composite motion, at the end of which the axis of the blank moves from the horizontal position to the vertical one (fig. 1), while the walls of the same blank result to be rotated by 180 degrees (clockwise with reference to the view of fig. 1) with respect to the above-mentioned axis.
  • the blank intercepts a fixed catch projection 60 (fig. 3) which provides for unfolding the blank partially; the unfolding is completed, with the consequent definition of the open tubular form of the blank, by the combined action of the prongs 17a, 17b as will be hereinafter more fully explained.
  • the means 16 are made up of a cylindrical shell 20, fastened to the structure 50, whose axis 40 results to be inclined by 45 degrees with respect to two perpendicular planes, respectively horizontal and vertical.
  • Said shell revolvingly supports, inside itself, through known means 22, a tubular turret 21 whose upper portion is provided with two tubular projections 24a, 24b, orthogonal to each other, inclined by 45 degrees with respect to the axis 40.
  • Said projections revolvingly support, inside themselves, through known means 27, relative shafts 25a, 25b, to whose inner ends result to be splined respective bevel gears 28a, 28b in mutual meshing with one bevel gear 29 splined to the end of a shaft 30 located inside the turret 21 and revolvingly supported by this latter through known means 32.
  • the tubular turret 21 is drawn into rotation, according to M through means 23, while the shaft 30 is drawn into rotation through means 31; said means are motorized in relationship of phase with the motorization of the chains 80,81 and of the arm 13.
  • the unit made up of the means 31 and the bevel gears 29,28a is suited to draw into rotation the shaft 25a in the sense N according to an angular speed double with respect to the angular speed of the turret 21; in other words, to every revolution of the turret correspond two revolutions of the shaft 25a.
  • the same principles also apply to the shaft 25b.
  • the means 16 are illustrated, by a continuous line, in the position wherein the sucker 15 mates the first side wall 2 of the blank, while the sucker 15a has just completed the transfer of a blank, partially open, between a pair of corresponding prongs 17a, 17b.
  • the 180-degree rotation of the turret 21 according to M brings about a gradual rotation of the longitudinal axis of the blank 1 which moves from horizontal to vertical; said rotation, with reference to figs. 1 and 3, is counterclockwise.
  • the blank partially unfolded, would be inserted into the seating 45, defined by the prongs 17a, 17b of a corresponding pair of prongs, with a speed component concordant with the sense T of translation of the inner branch 19a of the line 18; this, when the action of the fixed catch projection ceases, could bring about either the re-closing of the blank, or its coming out of the seating 45.
  • edge common to the walls 3,4 intercepts (in a suitable phase relationship with the deactivation of the sucker 15) the pushing prong 17b, while the edge common to the walls 2,5 goes to strike against the catching prong 17a.
  • the sucker 15 carries out its idle run to return to the intermediate station I, and at the same time the other sucker 15a takes from this latter a blank of flattened form: the sucker 15a performs the same operating steps described above with reference to the sucker 15.
  • the conformation of the means 16 is such as to exploit the prongs 17a, 17b, in order to complete the unfolding of the blank; this involves positive effects, on one hand, in terms of productivity of the device conforming to the invention, and on the other hand of reliability of the latter, since the opening of the blank is assured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (7)

  1. Procédé de retrait de cartons à plat pour tubes, placés dans un magasin, et d'ouverture de ces cartons à plat pendant leur transfert sur une chaîne d'emballage; celle-ci comprend un transporteur (18) caractérisé par au moins deux barres (80,81) de dimensions égales, qui tournent respectivement l'une et l'autre sur elles-mêmes de façon horizontale à l'intérieur d'une bague fermée; la première barre (80) est parallèle à la seconde barre (81), elles ont une vitesse égale, et sont délimitées par des branches (17b, 17a), espacées de manière régulière qui respectivement poussent et prennent; formant un cercle, elles sont orientées vers l'extérieur de façon à constituer une série de plans verticaux (45); chaque plan vertical relié à une station d'alimentation (R) déterminée par la partie initiale de la branche intérieure (19a) du transporteur (18), a pour fonction de recevoir un carton à plat pré-imprimé (1), orienté verticalement et partiellement ouvert, puis de bloquer correctement ce même carton; ledit procédé, caractérisé en ce qu'il comprend: des premiers moyens (7) destinés à prendre le dernier carton à plat de la pile (P) de cartons (1) dans le magasin (6), et à le transporter jusqu'à une station intermédiaire (I) où ledit carton sera placé en position horizontale; des seconds moyens (16) actionnés par le mouvement des premiers moyens (7) et des barres (80,81) sont destinés à prendre le carton à plat situé dans ladite station intermédiaire (I) et ils permettent de déplacer le carton à plat un déplacement en l'orientant d'une position horizontale vers une position verticale ainsi que de le faire tourner autour de son axe de façon à ce que, en premier lieu, le même carton partiellement ouvert, soit pris par les moyens de pliage fixes (60) puis, pour un mouvement (H) contraire au sens de déplacement (T) de ladite branche intérieure (19a) du transporteur (18), le carton se retrouvera entre les barres qui prennent (17a) et les barres qui poussent (17b) sur un plan vertical (45), l'ouverture totale du carton étant effectuée par les dernières dents.
  2. Procédé selon la revendication 1, caractérisé en ce que lesdits seconds moyens (16) comprennent:
    une tourelle tournante en forme de tube (21), supportée par une structure fixe (20,50) et inclinée horizontalement et verticalement par rapport aux deux éléments de cette structure et pourvue à l'une de ses extrémités d'au moins un tube de projection (24a, 24b), incliné par rapport à l'axe de la tourelle de manière à avoir deux positions limites respectivement horizontale et verticale, conséquence d'une rotation d'un demi-tour de ladite tourelle;
    un conduit (25a, 25b) situé à l'intérieur du tube de projection (24a, 24b) qui supporte son axe de rotation et par lequel il expulse;
    un piston (15,15a) restreint une partie du conduit, partie à l'extérieur du tube de projection et est orienté de façon à pouvoir prendre la partie supérieure du carton à plat déjà situé dans la station intermédiaire (I); les premiers moyens font tourner la tourelle et les seconds moyens font tourner le conduit (25a, 25b) à une vitesse d'angle double par rapport à celle de la tourelle et dans le sens (N) contraire au sens de rotation du tube de projection (24a, 24b).
  3. Procédé selon la revendication 2, caractérisé en ce que la tourelle (21) a une inclinaison de 45 degrés par rapport aux plans horizontal et vertical, alors que le tube de projection (24a, 24b) a une inclinaison de 45 degrés par rapport à l'axe de la tourelle; les pistons sont positionnés perpendiculairement au conduit qui les supporte (25a, 25b).
  4. Procédé selon la revendication 1, caractérisé en ce que les premiers moyens (7) comprennent:
    un manche (8) dont l'extrémité est reliée à une structure fixe (50);
    un conduit (10) télescopique est rattaché au manche; les seconds moyens de piston (11) restreignent l'ouverture de l'extrémité du conduit;
    un levier (13) a une extrémité reliée au conduit, l'autre étant reliée à la structure fixe; les moyens (70) destinés à donner un mouvement oscillatoire, sont en relation avec la mise en marche des seconds moyens (16); ledit manche (13) détermine deux positions limites (21,22) aux seconds moyens (11) de façon à pouvoir d'abord prendre le carton situé au bas (1a) de la pile (P) de cartons à plat placée dans le magasin (6) et ensuite à déposer ce même carton dans la station intermédiaire (I).
  5. Procédé selon la revendication 1, caractérisé en ce que ledit magasin est orienté parallèlement dans le sens de l'extension maximale du transporteur (18), et comprend une partie longitudinale (6a) ainsi qu'une partie (6b) inclinée vers le bas, qui suit la précédente; cette dernière contient une pile (P) de cartons à plat (1) pour tubes.
  6. Procédé selon la revendication 3, caractérisé en ce que les premiers moyens de piston comprennent au moins un levier (26a, 26B) perpendiculaire au conduit correspondant (25a, 25b) dont l'extrémité est reliée à au moins un piston.
  7. Procédé selon la revendication 2, caractérisé en ce que les seconds moyens de mise en marche comprennent: un engrenage conique (28a, 28b) servant de clé à l'extrémité intérieure du conduit (25a, 25b) qui s'engrange en même temps que l'engrenage conique (29) servant de clé à l'extrémité du conduit (30) situé à l'intérieur de la tourelle (21) et relié à celle-ci par son axe de rotation, l'autre extrémité, à l'extérieur de la tourelle, est reliée aux moyens de mise en marche (31).
EP91830087A 1990-03-13 1991-03-12 Dispositif pour prendre des flans de forme tubulaire aplatie, à partir d'un magasin, et pour ouvrir ces flans pendant leur transfert vers une ligne d'emballage pour obtenir des boîtes Expired - Lifetime EP0447375B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT338790 1990-03-13
IT00338790A IT1238267B (it) 1990-03-13 1990-03-13 Dispositivo per il prelievo di fustellati, in configurazione tubolare appiattita,da un magazzino,e per l'apertura di tali fustellati durante il loro trasferimento ad una linea di confezionamento.

Publications (2)

Publication Number Publication Date
EP0447375A1 EP0447375A1 (fr) 1991-09-18
EP0447375B1 true EP0447375B1 (fr) 1993-11-03

Family

ID=11106168

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91830087A Expired - Lifetime EP0447375B1 (fr) 1990-03-13 1991-03-12 Dispositif pour prendre des flans de forme tubulaire aplatie, à partir d'un magasin, et pour ouvrir ces flans pendant leur transfert vers une ligne d'emballage pour obtenir des boîtes

Country Status (4)

Country Link
EP (1) EP0447375B1 (fr)
DE (1) DE69100572T2 (fr)
ES (1) ES2046035T3 (fr)
IT (1) IT1238267B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20050583A1 (it) 2005-09-28 2007-03-29 Marchesini Group Spa Metodo per la messa a volume di fustellati tubolari e stazione in cui tale metodo e' attuato

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1583438A (fr) * 1968-02-29 1969-10-31
DE3241693A1 (de) * 1982-11-11 1984-05-17 Robert Bosch Gmbh, 7000 Stuttgart Kartoniermaschine mit einer vorrichtung zum aufrichten und bereitstellen von faltschachteln
IT1199403B (it) * 1984-07-18 1988-12-30 Ima Spa Apparecchiatura per allestire ed alimentare contenitori od astucci all'uscita di macchine intubettatrici e particolarmente in macchine intubettratrici-astucciatrici
AU584804B2 (en) * 1986-05-23 1989-06-01 Advance Machinery Pty. Ltd. Box erector

Also Published As

Publication number Publication date
IT9003387A0 (it) 1990-03-13
ES2046035T3 (es) 1994-01-16
DE69100572D1 (de) 1993-12-09
EP0447375A1 (fr) 1991-09-18
DE69100572T2 (de) 1994-05-11
IT1238267B (it) 1993-07-12
IT9003387A1 (it) 1991-09-13

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