EP0044820A1 - Machine et procédé pour emballer des articles de produits - Google Patents

Machine et procédé pour emballer des articles de produits Download PDF

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Publication number
EP0044820A1
EP0044820A1 EP81830115A EP81830115A EP0044820A1 EP 0044820 A1 EP0044820 A1 EP 0044820A1 EP 81830115 A EP81830115 A EP 81830115A EP 81830115 A EP81830115 A EP 81830115A EP 0044820 A1 EP0044820 A1 EP 0044820A1
Authority
EP
European Patent Office
Prior art keywords
tray
film
machine
trays
wrapping
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Withdrawn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
EP81830115A
Other languages
German (de)
English (en)
Inventor
Franco Pioltini
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.)
Pittacus AG
Original Assignee
Pittacus AG
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 Pittacus AG filed Critical Pittacus AG
Publication of EP0044820A1 publication Critical patent/EP0044820A1/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Withdrawn legal-status Critical Current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
    • B65B11/54—Wrapping by causing the wrapper to embrace one end and all sides of the contents, and closing the wrapper onto the opposite end by forming regular or irregular pleats

Definitions

  • the present invention relates to a machine and a process for packaging products carried in trays by wrapping a thin foil sheet or film of plastic material.
  • the invention relates therefore to the forming of packages for products of different kind and more particularly food products, made up by containers, trays, boxes etc. containing the products and wrapped by a film of trasparent plastic and stretchable material, e.g. polyvinyl chloride, that is enveloped and sealed around the product and the tray in order to form discrete packages.
  • a film of trasparent plastic and stretchable material e.g. polyvinyl chloride
  • the machines of this type employ members and devices that are mostly mechanical or electropneumatic for controlling the different operations so that it is generally unfeasible even for the manufacturer to modify the machine in order to meet the user's needs.
  • a further object of the invention is to realize a packaging machine having conveying means of the film formed by endless elastic cords or belts that allow for changing the width of the plastic film fed to the wrapping station.
  • the machine according to the invention comprises:
  • each operating cycle comprises the steps of:
  • the machine according to the invention preferably employs a microcomputer suitably programmed to command the operations relating to the packaging of anyone of the type of trays for which it is preset, without any manual intervention but the initial set of the tray size and the selection of the film roll.
  • a microcomputer suitably programmed to command the operations relating to the packaging of anyone of the type of trays for which it is preset, without any manual intervention but the initial set of the tray size and the selection of the film roll.
  • a preferred embodiment of the machine according to the invention comprises a supporting frame 1, laterally equipped with a conveying device 2 for trays 20, formed by a conveying belt 25 moving around two rolls, 26 and 27, and onto which it is laid a tray containing a product to be transferred to a lifting plate 36 initally disposed in a lowered position.
  • a wrapping station Above the lifter a wrapping station includes an upper plate 28 having a rectangular opening or matrix 24. Above the latter an extractor apparatus 4 is provided to drive out the enveloped trays. Extractor 4 includes a raised conveyor 34 having a moving belt 35 covered by an elastic spongy material. By friction engagement with the package it pushes the latter out of the wrapping station.
  • the machine contains a reduction gear unit 6 for the main (electric) motor 7 tha drives the lifting device, the extracting conveyor 4, etc. Particularly referring to Fig. 1, the machine further provides for at least two pairs of.side rolls 11, 12 of thin plastic stretchable film. On the upper part there are provided means for unrolling, conveying and cutting the film that will be better illustrated in the following.
  • conveying plane 3 of the feeding device is equipped with a switch 54 starting each operating cycle when the machine works at steady conditions.
  • Fingers or pushers. 37 fixed to the conveying belt 25 carry trays 20 to the lifting device 36 in proper alignement.
  • the plastic transparent film 18 to be wrapped is drawn from rolls .such as those shown with 11 and 12 according to the size of the tray to be wrapped. More particularly, in the machine according to the invention both width and length of the wrapping sheet can be precisely adjusted since the longitudinal cutting device explained later will determine the width of the cut sheet whereas the selection of one of the rolls having different widths allows for choosing the proper length of the wrapping sheet.
  • the machine can be simmetrically built as shown in the figures, with a further pair of wrapping material rolls 41, 42 preferably identical to rolls 11 and 12 on the left side as seen in Fig. 1.
  • the film driving movement can be reversed quite simply to allow using the film unrolling from either group of rolls. Consequently it is possible to wrap a series of trays using a roll of one size (e.g. right hand roll 11) and simultaneously to arrange the machine for packaging the next series of trays with a film of different width (e.,g. left hand roll 42). This way stop periods to switch to another series of trays having different size are almost completely avoided, as well a stop periods for replacing an exhausted roll.
  • plastic film is unrolled and fed through driving rolls and elastic conveyors 8 and 9 known as plasticords, formed by elastic endless cords usually with circular cross-section, movable along a closed path, around a plurality of driving and guide sheaves. More precisely the film turns around guide rolls 14, is drawn by driving and stopping rolls 17 and then is engaged between elastic cords 8 and 9. for the final positioning in the wrapping station.
  • driving rolls and elastic conveyors 8 and 9 known as plasticords, formed by elastic endless cords usually with circular cross-section, movable along a closed path, around a plurality of driving and guide sheaves. More precisely the film turns around guide rolls 14, is drawn by driving and stopping rolls 17 and then is engaged between elastic cords 8 and 9. for the final positioning in the wrapping station.
  • This elastic conveying means so positioned allows for relevant advantages over the usual belt conveying systems. Namely the device is quite simpler, substantially cheaper and more effective and reliable besides allowing for adjustements for the film width thanks to the side mobility of the sheaves.
  • a length of unrolled film is cut by means of a perforating tool 13 preferably built as a saw-toothed blade that is lifted and engaged against the unwinding film 18 whereas, simultaneously, roll 14 is braked by a friction mechanism.
  • a perforating tool 13 preferably built as a saw-toothed blade that is lifted and engaged against the unwinding film 18 whereas, simultaneously, roll 14 is braked by a friction mechanism.
  • the actuators of the wrapping machine are controlled by cam 5 rotated by main motor 7, that starts a wrapping cycle upon the closure of a switch and causes the different lifting and lowering operations, through levers. 39, 40, folding operations, through lever 32 for actuating the folders, and so on.
  • the operator After selecting a suitable roll, unrolling a portion and fitting the same between, the guide members and presetting in a control panel the value of the length to be cut (corresponding to a prefixed width of the tray), the operator starts the machine and places a tray 20 over microswitch 54 of the feeding device 2, thereby causing to closure of the switch 54 and the beginning of the cycle.
  • the real beginning of the cycle is however dependent upon the angular portion of cam 5 and comprise lowering of plate . 36 to pick up the tray 20 advancing along the conveying line . 3, and the unrolling of the film.
  • a central control unit constantely monitors the length of unrolled film stopping the drawing when such a length is equal to the one preset for the series of tray. The film is than cut and the drawing resumed whereas at the same time the lifting device is stopped.
  • This portion of the machine cycle has a variable duration depending upon the preset size for a series of trays. In fact, this first time interval for unrolling the film must be such as to cause a prefixed length of film be unwound.
  • the sheet After the cutting, the sheet must be advanced for a second time interval, long enough to center the cut sheet over matrix 24.
  • Such first and second time intervals are constant for the whole series of trays having the same size, but must be automatically changed by the machine when the operator sets another tray size.
  • The'control circuitry carries out .such change without any delay and, at most, a dry machine cycle is required to get rid of the film portion already positioned.
  • the sequence of the remaining operations is common, independently from the size of the trays.
  • the sheet, cut and positioned, is fastened against surface 28 by longitudinal pressers 15 actuated by electromagnets 16.
  • Lifter 36 thanks to levers 39, 40, raises tray 20 causing it to pass through matrix 24 thereby stretching and wrapping the film over the article.
  • the longitudinal pressers are released and side folders 29 are closed. Thereafter the folders are opened so that the partially packaged tray can be extracted at the beginning of the next cycle after completing the wrapping and the sealing of the. folded edges.
  • the forward edge is folded when the tray, at the beginning of the next machine cycle, is advanced by dragger 34 (controlled by cam 5 through suitable reducing gear) toward sealing plate 44.
  • Rear folder 48 carries out the last folding before the package moves to the sealing plate where the folded film portions are heat sealed. As,.for the preceding operation again reference is made to the already mentioned U.S. Patent No.3,662,513.
  • the main difficulty in realizing a fully automatized machine for unrolling, cutting and positioning the plastic film in accordance with the tray size preset by the operator resided in measuring and checking the extract length of the unrolled and cut film with the prefixed data and getting the cut portion advanced of the precise distance to overlay the tray, or better, matrix 24.
  • the microcomputer produces timing signals for the different operations that are time offset according to the sizes of the trays.
  • the resulting machine is highly flexible since any modification will effect only the programming of the microcomputer and this latter is easy to be changed by altering or replacing the stored program.
  • the machine is relatively inexpensive since the working follows a standard cycle and the mechanical controls are kept to a minimum so as to obtain a simple and reliable machine.
  • the microcomputer initially checks whether the switch associated with cam 5 is correctly positioned. In the negative the beginning of the operation is delayed until the cam reaches the angular position of the switch.
  • the lifting device begins to lower the plate and unrolling goes on until identity is detected between the length of the unrolled film and the value preset by the operator. Upon detecting such identity the drawing mechanism and the lifting device are stopped. The film is cut, the unrolling Mechanism is started again and the brake released.
  • Diagram LF relates to the lifting whereas diagram FD shows the movements of the folders.
  • Diagram RL relating to the unrolling is formed by a plurality of portions, each relating to a prefixed length of film to be cut and the same is true for diagram .CT showing that the .cut can occurs at different times.
  • diagrams relating to the rear and front folding arms, .PZP and PZA respectively, as well as the ones of the feeding, AL, and dragging, DR.
  • More particularly said delays are important in order to precisely control the film advancing before and after the cut so as to position the film exactly over the tray.
  • Fig. 5 is a block diagram of the control unit of the machine, comprising a clock source CK including a quartz oscillator having a frequency of 2MHz, an 8 bit microprocessor ⁇ P of general type that is able to execute an iterative aritmentic-logic program with sufficient speed, and a read only memory RM having a storage capacity of 1 Kbyte (i.e. 1024 words or characters each formed by 8 bits).
  • Output signals to the actuating circuits comprise electronic pulses that are present on different leads according to timing sequences that depend upon the operation to be carried out. Such output signals, processed by the microcomputer, are transmitted to the actuating circuits through distributor D, a holding circuit or memory LT and a buffer unit BF3.
  • Input signals to the control unit formed by the signals preset by the operator and by the ones received from the machine sensors, are applied to the memory and the microcomputer through buffer unit BF2 and transceiver TR2.
  • the actuating circuitry includes a plurality of electromagnets connected between the output of the control unit and a low voltage power supply so as to allow current flowing through those electromagnets coils having a logical 0 on their terminal.
  • control unit that employs a microcomputer is not to be considered limiting since the control unit can be realized by means of different electric circuits, in case a cabled logic in view of the reduced amount of processing, or by means of other and simpler microcomputers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
EP81830115A 1980-07-22 1981-07-14 Machine et procédé pour emballer des articles de produits Withdrawn EP0044820A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2359580 1980-07-22
IT23595/80A IT1131751B (it) 1980-07-22 1980-07-22 Macchina procedimento per il confezionamento di prodotti mediante avvolgimento di una pellicola di materiale plastico attorno a vassoi di dimensioni varibili contenenti i detti prodotti

Publications (1)

Publication Number Publication Date
EP0044820A1 true EP0044820A1 (fr) 1982-01-27

Family

ID=11208424

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81830115A Withdrawn EP0044820A1 (fr) 1980-07-22 1981-07-14 Machine et procédé pour emballer des articles de produits

Country Status (4)

Country Link
EP (1) EP0044820A1 (fr)
JP (1) JPS5755810A (fr)
ES (1) ES504165A0 (fr)
IT (1) IT1131751B (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0086754A2 (fr) * 1982-02-16 1983-08-24 Pittacus A.G. Machine d'emballage
EP0092758A2 (fr) * 1982-04-26 1983-11-02 HOBART CORPORATION (a Corporation of Delaware) Machine d'enveloppement de film comprenant des moyens de sélection pour la longueur de film
EP0092760A2 (fr) * 1982-04-26 1983-11-02 HOBART CORPORATION (a Corporation of Delaware) Système de commande d'enveloppement pour une machine d'enveloppement d'un film
EP0092759A2 (fr) * 1982-04-26 1983-11-02 HOBART CORPORATION (a Corporation of Delaware) Système de tâtonnement d'emballages de commande d'un film dans une machine d'enveloppement dans un film
EP0117517A2 (fr) * 1983-02-24 1984-09-05 HOBART CORPORATION (a Corporation of Delaware) Appareil pour calculer le prix d'un produit emballé dans une barquette
US4887412A (en) * 1987-08-07 1989-12-19 Fuji Pack Systems, Ltd. Wrapping machine
FR2662662A1 (fr) * 1990-05-29 1991-12-06 Boissier Gerard Machine d'emballage a fonctions pilotees par des actuateurs distincts.
EP0687238A1 (fr) * 1993-03-26 1995-12-20 Machinery Developments Limited Appareil de conditionnement
ES2112131A1 (es) * 1994-04-29 1998-03-16 Ulma S Coop Ltada Mejoras introducidas en maquinas envolvedoras de bandejas con film.
WO2004000651A1 (fr) * 2002-06-19 2003-12-31 A.W.A.X. Progettazione E Ricerca S.R.L. Appareil conçu pour alimenter en film de maniere selective une machine a emballer
CN102249015A (zh) * 2011-07-06 2011-11-23 长沙长泰机械股份有限公司 侧置式自动换膜围帘包装机
EP3093244B1 (fr) 2015-05-13 2018-03-21 Bizerba SE & Co. KG Dispositif de transport de feuille pour une machine d'emballage
EP3257760A4 (fr) * 2015-02-09 2018-07-11 Ishida Co., Ltd. Machine d'emballage sous film étirable
EP3587283A1 (fr) * 2018-06-25 2020-01-01 Bizerba SE & Co. KG Machine d'emballage destinée à l'emballage dans la feuille étirable et procédé d'emballage optimisé
EP3587289A1 (fr) * 2018-06-25 2020-01-01 Bizerba SE & Co. KG Dispositif de transport de feuilles pour une machine d'emballage destinée à l'emballage dans une feuille étirable
EP3659933A1 (fr) * 2018-11-27 2020-06-03 Bizerba SE & Co. KG Machine d'emballage destinée à l'emballage avec feuille extensible

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3590907A (en) * 1969-08-26 1971-07-06 Triangle Package Machinery Co Roll supports for automatic wrapping machines
US3662513A (en) * 1969-05-20 1972-05-16 Waldyssa Sa Method and apparatus for wrapping articles in stretchable sheet material
US3967433A (en) * 1973-10-05 1976-07-06 Sergio Bonfiglioli Process and machine for wrapping and packaging items in stretchable foil material
CH578971A5 (en) * 1974-04-02 1976-08-31 Pittacus Anstalt Wrapping machine using plastics stretch film - has loading table rising rearwards and completed package ejected at back
US4064676A (en) * 1977-05-09 1977-12-27 Pak-A-Matic, Inc. Skin packaging machine with travelling vacuum frame

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662513A (en) * 1969-05-20 1972-05-16 Waldyssa Sa Method and apparatus for wrapping articles in stretchable sheet material
US3590907A (en) * 1969-08-26 1971-07-06 Triangle Package Machinery Co Roll supports for automatic wrapping machines
US3967433A (en) * 1973-10-05 1976-07-06 Sergio Bonfiglioli Process and machine for wrapping and packaging items in stretchable foil material
CH578971A5 (en) * 1974-04-02 1976-08-31 Pittacus Anstalt Wrapping machine using plastics stretch film - has loading table rising rearwards and completed package ejected at back
US4064676A (en) * 1977-05-09 1977-12-27 Pak-A-Matic, Inc. Skin packaging machine with travelling vacuum frame

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0086754A2 (fr) * 1982-02-16 1983-08-24 Pittacus A.G. Machine d'emballage
EP0086754A3 (fr) * 1982-02-16 1984-05-30 Pittacus A.G. Machine d'emballage
EP0092758A2 (fr) * 1982-04-26 1983-11-02 HOBART CORPORATION (a Corporation of Delaware) Machine d'enveloppement de film comprenant des moyens de sélection pour la longueur de film
EP0092760A2 (fr) * 1982-04-26 1983-11-02 HOBART CORPORATION (a Corporation of Delaware) Système de commande d'enveloppement pour une machine d'enveloppement d'un film
EP0092759A2 (fr) * 1982-04-26 1983-11-02 HOBART CORPORATION (a Corporation of Delaware) Système de tâtonnement d'emballages de commande d'un film dans une machine d'enveloppement dans un film
EP0092760A3 (en) * 1982-04-26 1985-04-10 Hobart Corporation (A Corporation Of The State Of Delaware) Wrapping control and monitoring system for film wrapping machine
EP0092759A3 (en) * 1982-04-26 1985-04-17 Hobart Corporation Package sensing/film control system for film wrapping machine
EP0092758B1 (fr) * 1982-04-26 1987-11-04 HOBART CORPORATION (a Corporation of Delaware) Machine d'enveloppement de film comprenant des moyens de sélection pour la longueur de film
EP0117517A2 (fr) * 1983-02-24 1984-09-05 HOBART CORPORATION (a Corporation of Delaware) Appareil pour calculer le prix d'un produit emballé dans une barquette
EP0117517A3 (fr) * 1983-02-24 1985-04-17 HOBART CORPORATION (a Corporation of Delaware) Appareil pour calculer le prix d'un produit emballé dans une barquette
US4887412A (en) * 1987-08-07 1989-12-19 Fuji Pack Systems, Ltd. Wrapping machine
FR2662662A1 (fr) * 1990-05-29 1991-12-06 Boissier Gerard Machine d'emballage a fonctions pilotees par des actuateurs distincts.
EP0687238A1 (fr) * 1993-03-26 1995-12-20 Machinery Developments Limited Appareil de conditionnement
EP0687238A4 (fr) * 1993-03-26 1998-04-22 Machinery Developments Limited Appareil de conditionnement
ES2112131A1 (es) * 1994-04-29 1998-03-16 Ulma S Coop Ltada Mejoras introducidas en maquinas envolvedoras de bandejas con film.
WO2004000651A1 (fr) * 2002-06-19 2003-12-31 A.W.A.X. Progettazione E Ricerca S.R.L. Appareil conçu pour alimenter en film de maniere selective une machine a emballer
CN102249015A (zh) * 2011-07-06 2011-11-23 长沙长泰机械股份有限公司 侧置式自动换膜围帘包装机
CN102249015B (zh) * 2011-07-06 2015-08-19 长沙长泰机械股份有限公司 侧置式自动换膜围帘包装机
EP3257760A4 (fr) * 2015-02-09 2018-07-11 Ishida Co., Ltd. Machine d'emballage sous film étirable
EP3093244B1 (fr) 2015-05-13 2018-03-21 Bizerba SE & Co. KG Dispositif de transport de feuille pour une machine d'emballage
EP3093244B2 (fr) † 2015-05-13 2022-01-05 Bizerba SE & Co. KG Dispositif de transport de feuille pour une machine d'emballage
EP3587283A1 (fr) * 2018-06-25 2020-01-01 Bizerba SE & Co. KG Machine d'emballage destinée à l'emballage dans la feuille étirable et procédé d'emballage optimisé
EP3587289A1 (fr) * 2018-06-25 2020-01-01 Bizerba SE & Co. KG Dispositif de transport de feuilles pour une machine d'emballage destinée à l'emballage dans une feuille étirable
US10737895B2 (en) 2018-06-25 2020-08-11 Bizerba SE & Co. KG Film transport device for a packaging machine for packaging with stretch film
US10781006B2 (en) 2018-06-25 2020-09-22 Bizerba SE & Co. KG Packaging machine for packaging with stretch film and optimized packaging method
EP3659933A1 (fr) * 2018-11-27 2020-06-03 Bizerba SE & Co. KG Machine d'emballage destinée à l'emballage avec feuille extensible
US10703578B2 (en) 2018-11-27 2020-07-07 Bizerba SE & Co. KG Packaging machine for packaging with stretch film

Also Published As

Publication number Publication date
ES8301808A1 (es) 1983-01-01
IT8023595A0 (it) 1980-07-22
JPS5755810A (en) 1982-04-03
IT1131751B (it) 1986-06-25
ES504165A0 (es) 1983-01-01

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Inventor name: PIOLTINI, FRANCO