EP0220712A1 - Procédé et appareil pour envelopper des charges avec un film étirable - Google Patents

Procédé et appareil pour envelopper des charges avec un film étirable Download PDF

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Publication number
EP0220712A1
EP0220712A1 EP86114945A EP86114945A EP0220712A1 EP 0220712 A1 EP0220712 A1 EP 0220712A1 EP 86114945 A EP86114945 A EP 86114945A EP 86114945 A EP86114945 A EP 86114945A EP 0220712 A1 EP0220712 A1 EP 0220712A1
Authority
EP
European Patent Office
Prior art keywords
rollers
nipple
pair
load
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86114945A
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German (de)
English (en)
Inventor
Sauro Pieri
Rino Pieri
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.)
Pieri Srl
Original Assignee
Pieri 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 Pieri Srl filed Critical Pieri Srl
Publication of EP0220712A1 publication Critical patent/EP0220712A1/fr
Withdrawn legal-status Critical Current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
    • B65B11/02—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders
    • B65B11/025—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders by webs revolving around stationary articles
    • 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
    • B65B2210/00—Specific aspects of the packaging machine
    • B65B2210/14—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles
    • B65B2210/20—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles the web dispenser being mounted on a rotary arm

Definitions

  • This invention relates to a process and an apparatus for wrapping loads in a pre-stretched film of subsequently shrinkable material, of the kind of the plastics "with a memory", which are elastic but require a certain time interval between stretching and contraction.
  • the load must be supported on a turntable, with the film feeding and pre-­stretching device being fixed.
  • Apparatuses are known, as for instance the apparatus described and shown in the Italian Utility Model Application 15283 B/83, according to which the load is supported on a fixed platform, and the film feeding and stretching device is carried by a rotatable arm, which is displaced all around the load to be wrapped.
  • the problems depending from the rotation of the load are solved, nevertheless the other problems mentioned, viz easy and quick change of the load-wrapping speed and change of the pre-stretch amount of the film, are still unsolved.
  • the above prior art apparatus is intended to wrap loads which are displaced, and not rotated, with respect to the stationary film stretching device (or devices), and it is fully unsuited for wrapping heavy or bulky loads. Moreover, also according to the said prior art device no provision is made to quickly and easily vary the amount of stretch imposed to the film, as a function of the kind and of the dimensions of the load to be wrapped.
  • a still further problem in all the prior art load wrapping devices of the kind above referred derives from the fact that, generally, the loads to be wrapped have a polygonal outline, so that the tension imposed to the pre-stretched film leaving the pre-stretching device during the load wrapping operation is not uniform, and varies continuously from one edge of the load to the adjacent ones.
  • this object is attained, in a pre-stretching unit which is translated in a circular path around the periphery of a load to be wrapped, whilst being reciprocated with respect to the height of said load, and comprising a first pair of nipple rollers positively driven at a first peripheral speed by a suitable motor-reducer, and a second pair of nipple rollers positively driven at a second peripheral speed, greater than the said first peripheral speed, by the said motor-reducer through a suitable transmission, for pre-stretching a continuous strip of stretchable film unwound from a supply-reel carried by the said pre-stretching unit which is continuously feed through said first and second nipple-­rollers pairs, by providing the improvement according to which in the transmission from the said motor-reducer to said one pair of nipple rollers, and preferably to said first pair of nipple rollers, a suitable speed change gear is interposed.
  • means are provided in the said pre-stretching unit downstream of the said second pair of nipple rollers, in the form for instance of dandy rollers, cooperating with suitable sensors disposed along the path of said dandy rollers, the said sensors being electrically connected to means, such as for instance a frequency variator connected to the electric motor, and for instance an electric asynchronous motor, of the said motor-reducer, so as to automatically and instantaneously change the speed of rotation of the motor of said motor-reducer as a function of the variations in the tension imposed to the pre-stretched film leaving the pre-stretching device by differences in the dimensions and in the outline of the loads being wrapped.
  • means such as for instance a frequency variator connected to the electric motor, and for instance an electric asynchronous motor, of the said motor-reducer
  • means are provided for positively driving the supply roller of stretchable film at the same peripheral speed of the said first roller pair, so as to control the unwinding speed of the film from the said supply roller.
  • the machine shown comprises a fixed portal-like frame comprising two side uprights 1, connected together by a crosspiece 2.
  • An electrical motor 3 is mounted on the middle region of the crosspiece 2, with its shaft 4 downwardly extending from said crosspiece 2.
  • To the shaft 4 the shorter horizontal leg 5 of an L shaped supporting structure is secured by one end.
  • To the other end of leg 5 the vertical depending leg 6 of the said L shaped structure is secured.
  • the leg 6 extends downwardly up to in proximity of the bottom of the machine.
  • Reference 7 denotes a carriage which is slidably supported along leg 6. The said carriage 7 may be reciprocated along leg 6 by the motor 8 carried by the leg 5, through a suitable transmission.
  • Carriage 7 houses the pre-stretching unit, to be described later.
  • a roller conveyer 9 is disposed, supporting the load 10.
  • a gripper 11 is mounted to which the leading edge of the wrapping film 118 is fastened, before starting the load-wrapping operation, that is before that the carriage 7, housing the pre-stretching device, is translated together with the leg 6 under the control of the operating motor 3, all around the load 10 along the path of arrow F of Figure 2.
  • the said carriage 7 comprises a box-like base member 12, which is secured at one side to the slide 13 which is slidably guided in the guide 14 formed in the leg 6.
  • the slide 13 is reciprocated along the guide 14 by the motor 8 through suitable transmission means, and for instance through a transmission cable (not shown).
  • Numeral 15 denotes a lever-­ like member, housed inside of base member 12, and fulcrumed at one end to the pin 16.
  • the expanding mandrel 17 is idly secured.
  • the said mandrel 17 projects downwardly outside of the base member 12 through a circular slot 19 formed in the bottom of the said base member 12.
  • the jaws of the expanding mandrel 17 are operated through the handwheel 120 secured to the shaft 121 which in turn is connected to the mandrel 17, in a manner per se known.
  • the stretchable film supply reel 18 is fastened.
  • Reference numeral 20 denotes a downwardly extending idle roller rotatably supported by the base member 12, with its axis parallel to the axis of the mandrel 17.
  • the first nipple rollers pair is shown.
  • the roller 21 of said nipple rollers pair is idly supported for rotation about ist axis by the base member 12.
  • a gear 23 is keyed, in mesh with a gear 24 which in turn is keyed to the output shaft 25 of a speed change gear housed in gear box 26.
  • the shaft 29 of the second roller 22 of the said nipple rollers pair 21-22 is idly rotatably secured to the free end of a lever arm 27, fulcrumed at its other end to the pin 28 carried by the base member 12.
  • the said shaft 29 extends downwardly through a circular slot 30 formed in the bottom wall of the base member 12.
  • the lever arms 27 and 15 are urged together by means of the helical spring 31.
  • the nipple roller 22 is constantly urged in the direction of the roller 21 by means the helical spring 32 connected at one end to the lever 27 and at its opposite end to the fixed base member 12.
  • a cam-like member 33 is pivotably secured to the base member 12. The said cam-like member 33 may be brought in contact with the shaft 29 of the nipple roller 22, by means of the operating lever 34, thus causing said nipple roller 22 to be spaced from roller 21, against the action of spring 32.
  • By reference numerals 35 and 36 the second pair of nipple rollers is shown.
  • the nipple roller 35 is rotatably supported by the base member 12, and its shaft is connected to the output shaft of the motor-­reducer 37 carried by the base member 12.
  • a gear wheel 38 is keyed, which in turn is connected through a toothed belt 39 to the gear wheel 40 keyed on the input shaft of the speed change gear housed in box 26.
  • the nipple roller 36 is fitted on the shaft 41 extending downwardly through the slot 49 in the bottom of base member 12.
  • the shaft 41 is in turn rotatably idly secured to one end of the lever arm 42 of a bell crank lever, pivoted to the pin 43 secured to the base member 12.
  • a helical spring 44 is secured, said spring 44 being connected at its other end to the base member 12.
  • the said bell crank lever is also provided with a third lever arm 45 cooperating with a cam like element 46 pivoted at 47 to the base member 12, and operable through a lever 48 so as to shift the nipple roller 36 away from nipple roller 35, against the action of spring 44.
  • a first, radially outwardly extending lever arm 51 is secured to the said collar 5O .
  • a helical spring 52 is secured to the free end of said lever arm 51, the other end of which is secured to a bushing 57 which in turn is secured in rotatable but not slidable manner to one end of a screw-threaded spindle 53, which is in screw-­engagement by its other end with a nut 54 rotatably supported in the tubular support 55 fastened to the base member 12.
  • the nut 54 is connected to the operating handwheel 56.
  • a link 58 is pivotably connected at one end to the bushing 57, the other end of said link 58 being pivotably connected to a slider 59 slidably guided in a slot 60 of the base member 12.
  • the slider 59 is provided with a pointer cooperating with an indexed scale formed on the base member 12.
  • a second radially outwardly projecting lever arm 61 is secured, provided at its free end with a pivot pin 62 extending through a curved slot 63 formed in the bottom of the base member 12.
  • the bell-crank lever 64 is pivotably secured.
  • To the free ends of said lever 64 the dandy rollers 65 and 66 are idly pivoted.
  • Reference numeral 67 indicates an abutment member secured to pin 62, for abutment against sensors 69′ and 69"
  • 68 is a second abutment member secured to pin 62 for abutment against sensor 69.
  • the sensors 69, 69′ and 69" are electrically connected to the control panel 70 ( Figure 3) of the machine, and whenever activated, each of them may control through a frequency variator (not shown) a different speed of rotation of the asynchronous motor of the motor-reducer 37.
  • the speed change gear 26 may be controlled either manually or, as shown in Figure 3, it may be controlled by means of a remote control comprising an auxilary motor-­reducer 71, the otput shaft of which is connected to the input of the speed change gear 26 through the belt 72 and pulleys 73,74 transmission.
  • the output shaft of the auxiliary motor-reducer 71 is further connected, through a reduction gear train 75, 76 to the rotating element of a potentiometer 77, electrically connected to a proportional control circuit 78 housed in control panel 70, through which it is possible to set the desired output speed of the speed change gear 26.
  • a new bobbin 18 is inserted on the expandible mandrel 17, and fastened thereto by expanding the mandel jaws through the handweel 120.
  • the periphery of the bobbin 18 is mantained in contact with the periphery of the roller 21 by the action of the spring 31.
  • the continuous film web 118 from the bobbin 18 is guided around roller 20, then between the first nipple rollers pair 21,22.
  • the roller 22 is moved away from roller 21 by acting through lever 34 on the cam member 33.
  • the film web 118 is passed between the second nipple roller pairs 35, 36. Again, during this step the roller 36 is moved away from roller 35 by acting through lever 48 on cam member 46.
  • the film web is guided around rollers 65 and 66 and its free end is gripped to the gripper 11, as best shown in Figure 2.
  • the degree of pre-stretching of the film passing between the two nipple rollers pairs 21,22 and 35,36 is controlled by controlling the output speed of the speed change gear 26. Due to the fact that, generally, the load 10 is formed by a polygonal body, the film 118 is subjected during the wrapping operation of said load to changing strains. The said changes in the strains applied to the stretched film are transferred to the the dandy rollers 65, 66.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
EP86114945A 1985-10-30 1986-10-28 Procédé et appareil pour envelopper des charges avec un film étirable Withdrawn EP0220712A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT12593/85A IT1188054B (it) 1985-10-30 1985-10-30 Apparato per l alimentazione di film prestirato longitudinalmente in macchine adibite alla fasciatura di carichi pallettizzati
IT1259385 1985-10-30

Publications (1)

Publication Number Publication Date
EP0220712A1 true EP0220712A1 (fr) 1987-05-06

Family

ID=11141986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114945A Withdrawn EP0220712A1 (fr) 1985-10-30 1986-10-28 Procédé et appareil pour envelopper des charges avec un film étirable

Country Status (2)

Country Link
EP (1) EP0220712A1 (fr)
IT (1) IT1188054B (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938008A (en) * 1987-07-10 1990-07-03 Roy Salzsauler Pallet wrapping apparatus
US5016427A (en) * 1989-09-06 1991-05-21 Newtec International (Societe Anonyme) Film unwinding carriage for a packaging machine
EP0433718A1 (fr) * 1989-12-19 1991-06-26 B. Hagemann GmbH & Co. Procédé et dispositif pour enrouler des feuilles continues
US5040359A (en) * 1989-08-02 1991-08-20 Newtec International (Societe Anonyme) Method and machine for banding a palletized load
US5203136A (en) * 1989-09-06 1993-04-20 Newtec International (Societe Anonyme) Film unwinding carriage for a packaging machine
US5311725A (en) * 1992-07-30 1994-05-17 Lantech, Inc. Stretch wrapping with tension control
US5414979A (en) * 1993-04-23 1995-05-16 Lantech, Inc. Stretch wrapping apparatus
EP0653352A1 (fr) * 1993-11-17 1995-05-17 Burtech Ab Transmission variable par incréments entre des rouleaux de pré-étirage dans une machine d'emballage à film étirable
EP0842850A3 (fr) * 1996-11-13 1998-05-27 Lantech Technology Investment Corp. Dispositif et procédé pour envelopper une charge avec contrôle de la tension d'enveloppement
WO2000058155A1 (fr) * 1999-03-26 2000-10-05 Robopac S.A. Dispositif permettant de charger un film sur des machines de banderolage de produits
WO2000076852A1 (fr) * 1999-06-10 2000-12-21 Pesmel Oy Procede et arrangement en relation avec l'emballage d'un objet
US6311459B1 (en) * 1998-07-30 2001-11-06 Robopac S.A. Device and method for loading film on machines for wrapping products
EP1253083A1 (fr) * 2001-04-19 2002-10-30 ITW Limited Dispositif pour régler la tension d' une bande
DE20115649U1 (de) * 2001-09-24 2003-02-13 G & L Heikaus Kunststoffverarb Wickel- und Bremsvorrichtung
EP1524192A1 (fr) * 2003-09-05 2005-04-20 Oy M. Haloila Ab Banderoleuse
US11352152B2 (en) * 2019-09-20 2022-06-07 Signode Industrial Group Llc Stretch-wrapping machine with self-adjusting pinch rollers
US20220355958A1 (en) * 2021-05-07 2022-11-10 A.C.M.I. - Societa' Per Azioni Machine for stabilising palletised loads with reel change system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2059906A (en) * 1979-09-12 1981-04-29 Lancaster W G A process and apparatus for wrapping loads in stretch films

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2059906A (en) * 1979-09-12 1981-04-29 Lancaster W G A process and apparatus for wrapping loads in stretch films

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938008A (en) * 1987-07-10 1990-07-03 Roy Salzsauler Pallet wrapping apparatus
US5040359A (en) * 1989-08-02 1991-08-20 Newtec International (Societe Anonyme) Method and machine for banding a palletized load
US5203136A (en) * 1989-09-06 1993-04-20 Newtec International (Societe Anonyme) Film unwinding carriage for a packaging machine
US5081824A (en) * 1989-09-06 1992-01-21 Newtec International (Societe Anonyme) Film unwinding carriage for a packaging machine
US5125209A (en) * 1989-09-06 1992-06-30 Newtec International Method for creasing packaging films
US5016427A (en) * 1989-09-06 1991-05-21 Newtec International (Societe Anonyme) Film unwinding carriage for a packaging machine
EP0433718A1 (fr) * 1989-12-19 1991-06-26 B. Hagemann GmbH & Co. Procédé et dispositif pour enrouler des feuilles continues
US5311725A (en) * 1992-07-30 1994-05-17 Lantech, Inc. Stretch wrapping with tension control
US5414979A (en) * 1993-04-23 1995-05-16 Lantech, Inc. Stretch wrapping apparatus
EP0653352A1 (fr) * 1993-11-17 1995-05-17 Burtech Ab Transmission variable par incréments entre des rouleaux de pré-étirage dans une machine d'emballage à film étirable
EP0842850A3 (fr) * 1996-11-13 1998-05-27 Lantech Technology Investment Corp. Dispositif et procédé pour envelopper une charge avec contrôle de la tension d'enveloppement
US6311459B1 (en) * 1998-07-30 2001-11-06 Robopac S.A. Device and method for loading film on machines for wrapping products
WO2000058155A1 (fr) * 1999-03-26 2000-10-05 Robopac S.A. Dispositif permettant de charger un film sur des machines de banderolage de produits
US6698161B1 (en) 1999-03-26 2004-03-02 Robopac S.A. Device for loading film on machines for wrapping products
WO2000076852A1 (fr) * 1999-06-10 2000-12-21 Pesmel Oy Procede et arrangement en relation avec l'emballage d'un objet
US6276116B1 (en) 1999-06-10 2001-08-21 Pesmel Oy Method and arrangement in connection with wrapping of a piece
EP1253083A1 (fr) * 2001-04-19 2002-10-30 ITW Limited Dispositif pour régler la tension d' une bande
US6775961B2 (en) 2001-04-19 2004-08-17 Itw Ltd Web tensioning device
DE20115649U1 (de) * 2001-09-24 2003-02-13 G & L Heikaus Kunststoffverarb Wickel- und Bremsvorrichtung
EP1524192A1 (fr) * 2003-09-05 2005-04-20 Oy M. Haloila Ab Banderoleuse
AU2004208698B2 (en) * 2003-09-05 2006-09-07 Oy M. Haloila Ab Wrapping machine
US7107743B2 (en) 2003-09-05 2006-09-19 Oy M. Haloila Ab Wrapping machine
US11352152B2 (en) * 2019-09-20 2022-06-07 Signode Industrial Group Llc Stretch-wrapping machine with self-adjusting pinch rollers
US20220355958A1 (en) * 2021-05-07 2022-11-10 A.C.M.I. - Societa' Per Azioni Machine for stabilising palletised loads with reel change system
US11987406B2 (en) * 2021-05-07 2024-05-21 A.C.M.I.—Societa' Per Azioni Machine for stabilising palletised loads with reel change system

Also Published As

Publication number Publication date
IT8512593A0 (it) 1985-10-30
IT1188054B (it) 1987-12-30

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