EP0243861B1 - Machine pour envelopper en spirale des marchandises avec une bande de matériau plastique étirable - Google Patents

Machine pour envelopper en spirale des marchandises avec une bande de matériau plastique étirable Download PDF

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Publication number
EP0243861B1
EP0243861B1 EP87105876A EP87105876A EP0243861B1 EP 0243861 B1 EP0243861 B1 EP 0243861B1 EP 87105876 A EP87105876 A EP 87105876A EP 87105876 A EP87105876 A EP 87105876A EP 0243861 B1 EP0243861 B1 EP 0243861B1
Authority
EP
European Patent Office
Prior art keywords
roller
cam
switching
prestretch
pivotable
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
EP87105876A
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German (de)
English (en)
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EP0243861A1 (fr
Inventor
Dieter Schmitz
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.)
CYKLOP INTERNATIONAL
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CYKLOP INTERNATIONAL
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 CYKLOP INTERNATIONAL filed Critical CYKLOP INTERNATIONAL
Publication of EP0243861A1 publication Critical patent/EP0243861A1/fr
Application granted granted Critical
Publication of EP0243861B1 publication Critical patent/EP0243861B1/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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/04—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated
    • B65B11/045—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated by rotating platforms supporting the articles

Definitions

  • the invention relates to the packaging of loads and, in particular, to a machine for the spiral wrapping of packaging material with a plastic stretch film web by relative rotation of the packaging material and a film supply roll, the film supply roll and a stretching device being placed on a stand fixed along a machine-fixed stand. and downwardly movable carriages are mounted and the pre-stretching device has at least one stretching roller connected in a rotationally fixed manner to a friction wheel of a friction wheel transmission, which is mounted with an associated friction wheel for engaging and disengaging the friction wheel transmission on at least one support device which can be pivoted about a vertical axis, and has a mechanical switching device which in the initial phase of the winding cycle keeps the friction gear disengaged and then allows a clutch of the friction gear.
  • the take-off, stretching and web transport forces are derived from the relative rotation between the goods to be packaged and the film supply roll and are transmitted via the film web.
  • the film web should be relieved of tensile forces as much as possible.
  • the front part of the film web is wrapped loosely and without pre-stretching around the packaged goods (DE-PS 2 413 807). Relieving the stretch film from the stretching forces in the initial phase of the winding process is particularly important in pre-stretching winding machines in which the film material is cold stretched by 80% or more between two stretching rolls which are spaced apart and set to a fixed peripheral speed ratio via a gear.
  • a mechanical switching device is mounted on a carriage that can be moved up and down and holds the pivoting stretching roller with associated friction wheel in the uncoupled position until the carriage has carried out a specific stroke in the initial phase of the new winding cycle.
  • this known mechanical switching device is not without problems. It requires the use of a separate footplate underneath the slide, thereby limiting the slide stroke downwards and the lower winding position.
  • a mobile pallet winder such as that offered by the applicant under the trademark "Robopac"
  • the ground clearance of the pallet wrapping machine bypassing the pallet is impaired by the base plate. This has a particularly disruptive effect on uneven surfaces.
  • the object of the invention is to provide the winding machine with a structurally particularly simple mechanical switching device in such a way that neither the ground clearance nor the carriage stroke are impaired.
  • the machine according to the invention is characterized in that the mechanical switching device has a switching cam, which is supported on a machine-fixed component, is guided such that it can be displaced in the vertical direction to a limited extent, and is resiliently pretensioned in an upper end position and has an overhead contact surface and a lateral cam surface, and a switching element, which acts on the cam surface in the initial phase of the winding cycle and on the contact surface of the switching cam in the end phase of the winding cycle, is held on the pivotable carrier device at a defined distance from the pivotable stretching roller; presses down, is biased into a decoupled position at least after running onto the switch cam and keeps the pivotable stretching roller uncoupled via its carrier device when it contacts the cam surface of the switch cam.
  • a switching cam which is supported on a machine-fixed component, is guided such that it can be displaced in the vertical direction to a limited extent, and is resiliently pretensioned in an upper end position and has an overhead contact surface and a lateral cam surface
  • a switching element which acts
  • the invention makes a footplate restricting the ground clearance and the sled stroke unnecessary.
  • the switch cam is itself spring-loaded vertically and can be arranged at a largely arbitrary height, preferably on the machine-fixed stand or mast, at a location which favors installation and is easily accessible.
  • the carriage carries only the switching element, the intended function of which is to switch off the stretching effect of the pivotable roller in the initial phase of the winding process with optimum reliability, since it is directly coupled to the pivot arm of the pivotable roller.
  • the switching element By suitable design of the support arm of the switching element rigidly connected to the swivel arm of the roller, the switching element can be adapted to the position and the spring stroke of the switching cam which is supported on the machine.
  • the parts of the mechanical switching device that are necessary for the invention are minimized and can be of simple and easy to manufacture and assemble design.
  • the invention is preferably applied to a winding machine of the type described in DE-PS 3 043 807, the machine being characterized in that the stretching device has two stretching rollers which can be rotated on parallel axes, each of which is coupled to a friction wheel of a friction wheel gear and to a carrier device are mounted, wherein at least one of the two carrier devices is pivotable about a vertical axis, that the friction gear deactivated in a first pivoting position of the pivotable carrier device and activated in a second pivoting position of this carrier device in that the two friction wheels are in frictional contact, the friction wheels and the associated stretching rollers being dimensioned such that the peripheral speed of the outlet-side roller is higher than that of the inlet-side roller Roller to advance the film material between the parallel stretching rollers, that the mechanical switching device controls the pivoting position of the pivotable carrier device during a winding cycle, in order to wind the film web during an initial phase of the winding cycle under reduced tension on the goods to be packaged, and then automatically to the end of the stretching device Activate
  • the invention can also be used in conventional brake systems, with the pivotally mounted stretching roller being able to be braked under the tension of the film web via the friction gear.
  • a preferred embodiment of the invention is characterized in that the pivotable carrier device has a two-armed lever, on one arm of which the pivotable stretching roller is mounted coaxially with a friction wheel and on the counter arm of which the switching element is mounted.
  • a two-armed lever is particularly easy to adapt to the structural and kinematic conditions of the packaging machine and also enables direct power transmission between the switching element and the friction wheel to be switched.
  • the switching element is preferably a roller freely rotatably mounted on a horizontal axis of rotation.
  • the invention is further developed in that in the case of coupled friction wheels the contact surface of the switching cam is arranged in the path of movement of only one circumferential segment of the roller and the axis of rotation of the roller lies outside the contact surface of the switching cam, so that the roller is released laterally after being relieved from the film pull by the upwardly spring-loaded switching cam is disengaged and the friction wheels uncoupled by the spring force of the switch cam.
  • an arm carrying the pivotable stretching roller can also be biased into a decoupled pivoting position by a spring.
  • the shape of the contact surface of the switching cam is not critical.
  • the contact surface can therefore be inclined, curved, flat, with a linear or planar attack on the switching element. It is only important that the contact surface is arranged in the path of movement of the switching element in such a way that the switching element in the final phase of the winding process makes a vertical force component effective for depressing the switching cam on the contact surface.
  • the run-up surface runs in a horizontal plane and the cam surface runs approximately vertically.
  • the switching cam itself is mounted on a vertical guide in such a way that it can only carry out vertical movements, but can absorb effective transverse forces on the lateral cam surface without a horizontal evasive movement.
  • the spiral winding machine shown in the drawing has a carriage 1 which can move vertically back and forth on a machine-fixed column 2 via vertically running guide rails 3 and running wheels 4.
  • the carriage 1 carries all the essential machine components for wrapping the palletized packaging material L (FIG. 4) with a plastic stretch film 5.
  • This includes a film supply roll 6, of which the film web 5 during wrapping of the packaging material L by relative movement of the carriage 1 and the packaging material L is withdrawn, and a pre-stretching device 7 comprising two mutually spaced parallel stretching rollers 8 and 9 and a friction gear 10 with friction wheels 12 and 13.
  • the stretching rollers 8 and 9 have the same diameter and are each rotatably fixed with a friction wheel 12 via a vertically extending shaft or 13 connected.
  • the diameter of the outlet-side friction wheel 13 is considerably smaller than that of the inlet-side friction wheel 12, so that in the coupled state of the friction wheel gear 7 (FIG. 2B) the peripheral speed of the outlet-side stretching roller 9 is higher than the peripheral speed of the one determined by the peripheral ratio of the two friction wheels inlet-side stretching roller 8.
  • Different circumferential roller speeds can also be achieved by different diameters of the two stretching rollers 8 and 9.
  • the shaft of the stretching roller 8 is rigidly supported on the carriage 1 via arms 14.
  • the lower pivot lever of the pair of pivot levers 15 is designed in the exemplary embodiment shown as a double lever and carries on the counter arm 17 a switching roller 18 rotatably mounted about a vertical axis.
  • the film web 5 runs from the carriage via a deflection roller 20 mounted on one side on a base plate 19 of the carriage 1.
  • a switching cam 21 interacts with the switching roller 18, which is vertically displaceably mounted on a column-fixed bracket and is biased vertically upwards by spring means, shown here as a coil spring 23.
  • the switching cam 21 is cup-shaped with a flat run-up surface 24 and a lateral cam surface 25.
  • the run-up surface 24 lies in the vertical movement path of the switching roller 18 carried with the carriage 1.
  • the winding process begins in the lower carriage end position shown in FIGS. 1A and B.
  • the pivotable friction wheel 13 is spaced from the friction wheel 12 fixedly mounted on the slide, i.e. the friction gear is disengaged.
  • This decoupled position of the friction wheel 13 is maintained with the aid of the switching roller 18 engaging on the lateral cam surfaces 25 of the switching cam 21 even when the tensile forces acting in the direction of arrow Z of the film web 5 at the start of the winding process are the outlet-side stretching roller 9 and the associated friction wheel 13 try to push into the coupled position.
  • the vertical cam surface 25 blocks the pivoting movement of the pivot lever 15 via the lever arm 17 necessary for coupling the two friction wheels 12 and 13 until the switching roller 18 leaves the cam surface 25 at the end of a specific slide stroke and can pivot in freely.
  • FIGS. 2A and 2B show a relative position of the switching roller 18 and the switching cam 21 in an intermediate position of the slide when the friction gear transmission is coupled.
  • the switching roller 18 runs onto the running surface 24 of the switching cam 21, which is designed as a horizontal plane in the exemplary embodiment shown.
  • the switching roller 18 takes the switching cam 21, which is spring-biased upwards, while pressing the contact surface 24 downward, since the switching cam 21 cannot deflect laterally.
  • the swivel arm 15 can pivot out into the uncoupled position shown in FIG.
  • the pivoting force required for this can be applied, for example, by a tension spring 29 shown in broken lines in FIG.
  • a tension spring 29 shown in broken lines in FIG.
  • the design and arrangement of the components of the switching device interacting in the end position are such that the spring loading (spring 23) of the switching cam 21 can also be used for pivoting out the swivel arm 15.
  • the switching roller 18 is supported only with an outer segment on the edge of the switching cam 21 above the cam surface 25.
  • the roller axis of rotation 28 lies outside the movement path of the switching cam 21 loaded by the spring 23.
  • the console 22 supporting the switching cam 21 and its spring 23 can be arranged at any height on the column 2, so that in any case there is sufficient ground clearance even in the depressed state of the switching cam 21 shown in FIG. 3.
  • the cranked lever arm 17, which serves to hold the switching roller 18, is arranged and dimensioned to match the position of the switching cam 21.
  • the lever arm 17 with the switching roller 18 can also be assigned to the upper swivel arm 15. The function of the switching device does not change since both swivel arms 15 are connected to form a fixed unit.
  • the machine base which is only partially shown in the drawing, can be part of a mobile base that travels around the palletized load L during wrapping.
  • the friction wheel 12 carrying the carrier device 14 can be arranged in the same way as the carrier device 15 or also pivotable instead.
  • a wedge-shaped actuator can be attached to the lever arm 17, which is exposed to a lateral force component for pivoting the lever arm 15 into the decoupled position when it hits the ramp surface 24 under the influence of the receding cam 21.
  • the ramp surface 24 and / or the cam surface 25 can also be suitably beveled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)

Claims (10)

1. Machine pour envelopper sous forme de spirale des marchandises d'emballage avec une bande de feuille étirable en matière plastique (5) par rotation relative de la marchandise d'emballage et d'un rouleau d'alimentation en feuilles (6), le rouleau d'alimentation en feuilles et un dispositif de pré-étirage (7) étant montés sur un chariot (1) déplaçable vers le haut et vers le bas le long d'un montant fixé à la machine et le dispositif de pré-étirage comportant un cylindre d'étirage (9), lié, claveté en rotation, à une roue de friction (13) d'un mécanisme à roues de friction (12, 13) et qui, avec la roue de friction associée, est porté par au moins un dispositif support (15, 17) monté pivotant autour d'un axe vertical (16), pour l'accouplement et le désaccouplement du mécanisme à roues de friction, et un dispositif de commande mécanique (18, 21) qui, dans la phase de début du cycle d'enveloppement, maintient désaccouplé le mécanisme à roue de friction, et ensuite provoque un accouplement du mécanisme à roues de friction, caractérisée par le fait que le dispositif de commande mécanique comprend:
- une came de commande (21), qui est supportée par un élément (22, 2) fixé à la machine, guidée déplaçable verticalement, de manière limitée, et rappelée élastiquement dans une position d'extrémité supérieure et qui présente une face de montée (24) tournée vers le haut et une face de came (25) latérale et
- un organe de commande (18) qui, dans la phase de début du cycle d'enveloppement, est en prise sur la surface de came (25) et, dans la phase finale du cycle d'enveloppement, est en prise sur la face de montée (24) de la came de commande (21), est maintenu sur le dispositif support (15) à une distance définie du cylindre d'étirage pivotant (9), pousse vers le bas la came de commande (21), à l'encontre de la précontrainte d'un ressort, en montant sur sa face de montée (24), est rappelé en une position de désaccouplement au moins après la montée sur la came de commande (21) et maintient le cylindre d'étirage pivotant (9) désaccouplé, par l'intermédiaire de son dispositif support (15), lors de sa mise en position sur la face de came (25) de la came de commande (21).
2. Machine selon la revendication 1, caractérisée par le fait que le dispositif support (15) pivotant comporte un levier (15) à deux bras, sur l'un des bras duquel est monté le cylindre d'étirage (9) pivotant, coaxial à la roue de friction (13) et sur l'autre des bras (17) est monté l'organe de commande (18).
3. Machine selon la revendication 1 ou 2, caractérisée par le fait que l'organe de commande est un galet (18) monté tournant librement sur un axe de rotation horizontal (28).
4. Machine selon la revendication 3, caractérisée par le fait que lorsque les roues de friction (12, 13) sont accouplées, la face de montée (24) de la came de commande (21) est située sur la bande de déplacement vertical d'un segment périphérique seulement du galet (18) et l'axe de rotation (28) du galet est situé à l'extérieur de la face de montée (24) de telle sorte que le galet (18), après décharge de la traction (Z) de la feuille, est repoussé latéralement par la came de commande (21) rappelée élastiquement vers le haut et les roues de friction (12, 13) désaccouplées.
5. Machine selon la revendication 3 ou 4, caractérisée par le fait que la face de montée (24) se déplace dans un plan horizontal et la face de came (25) à peu près verticalement.
6. Machine selon l'une des revendications 1 à 5, caractérisée par le fait qu'un bras (15) portant le cylindre d'étirage (9) pivotant est rappelé par un ressort en position de pivotement désaccouplée.
7. Machine selon l'une des revendications 1 à 6, caractérisée par le fait que la bande de feuille est amenée à la marchandise d'emballage, par l'intermédiaire d'au moins un cylindre d'étirage (9), de manière telle qu'elle est maintenue tendue sur le cylindre d'étirage pendant le cycle d'enveloppement et pousse le cylindre d'étirage avec le dispositif support (15) dans une position de pivotement telle que le mécanisme à roues de friction (12, 13) est activé et provoque un pré-étirage de la bande de feuille.
8. Machine selon l'une des revendications 1 à 7, caractérisée par le fait que le dispositif de pré-étirage (7) comporte deux cylindres d'étirage (8, 9) tournant sur des axes parallèles, qui sont chacun accouplés à une roue de friction d'un mécanisme à roues de friction (12, 13) et sont montés sur un dispositif support (15, 14), au moins un (15) des deux dispositifs supports étant monté pivotant sur un axe vertical (16), que le mécanisme à roue de friction est désactivé dans une première position de pivotement du dispositif support (15) pivotant et est activé dans une seconde position de pivotement de ce dispositif support du fait que les deux roues de friction (12, 13) viennent en contact de friction, les roues de friction (12, 13) et les cylindres d'étirage (8, 9) associés étant dimensionnés de manière que la vitesse périphérique du cylindre côté déroulement (9) soit plus grande que celle du cylindre côté enroulement (8), pour pré-étirer la matière en feuille (5) entre les cylindres d'étirage parallèles, que le dispositif de commande mécanique (18, 21-25) contrôle, pendant un cycle d'enveloppement, la position de pivotement du dispositif support pivotant, pour que, pendant une phase de début du cycle d'enveloppement, la bande de feuille enveloppe la marchandise d'emballage sous une contrainte de traction réduite et qu'ensuite le dispositif de pré-étirage soit activé automatiquement jusqu'à la fin du cycle d'enveloppement.
9. Machine selon l'une des revendications 1 à 8, caractérisée par le fait que la came de commande (21) est sensiblement en forme de pot, la face de montée (24) étant formée sur la surface de fond orientée formant la face supérieure du pot, et qu'au moins un ressort à boudin (23) est disposé, comme ressort de poussée, entre une console (22) fixée à la machine et la came de commande et rappelle celle-ci (21) vers le haut.
10. Machine selon l'une des revendications 1 à 9, caractérisée par le fait que le bâti de machine est posé sur un socle déplaçable muni de roues de roulement.
EP87105876A 1986-05-02 1987-04-22 Machine pour envelopper en spirale des marchandises avec une bande de matériau plastique étirable Expired - Lifetime EP0243861B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863614775 DE3614775A1 (de) 1986-05-02 1986-05-02 Maschine zum sprialfoermigen umwickeln von verpackungsgut mit einer kunststoff-streckfolienbahn
DE3614775 1986-05-02

Publications (2)

Publication Number Publication Date
EP0243861A1 EP0243861A1 (fr) 1987-11-04
EP0243861B1 true EP0243861B1 (fr) 1990-04-11

Family

ID=6299956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105876A Expired - Lifetime EP0243861B1 (fr) 1986-05-02 1987-04-22 Machine pour envelopper en spirale des marchandises avec une bande de matériau plastique étirable

Country Status (4)

Country Link
US (1) US4718219A (fr)
EP (1) EP0243861B1 (fr)
DE (2) DE3614775A1 (fr)
FI (1) FI871935A (fr)

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Publication number Priority date Publication date Assignee Title
US5339601A (en) 1991-05-03 1994-08-23 Highland Supply Corporation Decorative cover with band
US5426914A (en) 1989-02-24 1995-06-27 Highland Supply Corporation Band applicator for applying a band about a sheet of material and a pot
US5105599A (en) 1989-02-24 1992-04-21 Highland Supply Corporation Means for securing a decorative cover about a flower pot
JPS6442205U (fr) * 1987-04-25 1989-03-14
US5410856A (en) * 1988-09-26 1995-05-02 Highland Supply Corporation Decorative assembly for a floral grouping
US4858415A (en) * 1988-10-05 1989-08-22 Lantech, Inc. Method and apparatus for unitizing tires
US5079898A (en) * 1988-12-06 1992-01-14 Indeco Products, Inc. Device and method for wrapping bales of hay or the like with protective material prior to ejection from a baler
US6668521B1 (en) * 1989-02-24 2003-12-30 Southpac Trust International, Inc. Method for applying a band about a sheet of material and a floral grouping
US5617702A (en) * 1989-02-24 1997-04-08 Southpac Trust International, Inc. Method for securing a decorative cover about a flower pot
FR2651481B1 (fr) * 1989-09-06 1991-12-20 Newtec Int Chariot de devidement de film pour machine d'emballage.
US5203136A (en) * 1989-09-06 1993-04-20 Newtec International (Societe Anonyme) Film unwinding carriage for a packaging machine
DE19542618C2 (de) * 1995-11-15 2001-05-31 Friatec Rpp Gmbh System Altvat Folienwickelvorrichtung
FI101282B1 (fi) * 1996-12-02 1998-05-29 Haloila M Oy Ab Käärintäkone
US6185914B1 (en) 1999-09-10 2001-02-13 1137508 Ontario Ltd. Pre-stretch web dispenser
IT1311134B1 (it) * 1999-11-05 2002-03-04 Aetna Group Spa Apparecchiatura per il cambio automatico di bobine di film .
FI109113B (fi) * 2000-02-17 2002-05-31 Haloila M Oy Ab Käärintälaite
FI116669B (fi) * 2003-09-05 2006-01-31 Haloila M Oy Ab Käärintäkone
ITRN20050069A1 (it) * 2005-12-06 2007-06-07 C & C Group Srl Macchina avvolgitrice a tavola rotante perfezionata
US9676507B2 (en) * 2008-07-23 2017-06-13 Best Packaging, Inc. Stretch wrapping system and process
HUE037335T2 (hu) * 2013-06-27 2018-08-28 Hangzhou Youngsun Intelligent Equipment Co Ltd Göngyölõgép
CA2942953C (fr) * 2015-09-25 2022-06-28 Paul Kurt Riemenschneider, Iii Systeme et methode d'application d'une pellicule extensible sur un chargement
CN113479430B (zh) * 2021-07-22 2022-05-24 赣州市领沃电子科技有限公司 一种数据线生产用缠绕打包设备

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Publication number Priority date Publication date Assignee Title
US4302920A (en) * 1979-11-21 1981-12-01 Lantech Inc. Film web drive stretch wrapping apparatus and process
US4317322A (en) * 1980-05-20 1982-03-02 Lantech, Inc. Rotatable film wrapping apparatus with wrap carrying mechanism
US4497159A (en) * 1982-02-01 1985-02-05 Lantech, Inc. Friction drive stretch wrapping apparatus
GB2169260B (en) * 1984-10-08 1989-04-26 British Oxygen Co Ltd Improvements in stretch wrapping

Also Published As

Publication number Publication date
DE3614775A1 (de) 1987-11-05
EP0243861A1 (fr) 1987-11-04
DE3762223D1 (de) 1990-05-17
FI871935A (fi) 1987-11-03
US4718219A (en) 1988-01-12
FI871935A0 (fi) 1987-04-30

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