EP1319596A2 - Distributeur réglé mécaniquement pour machines d'emballage et machine d'emballage avec un tel distributeur - Google Patents

Distributeur réglé mécaniquement pour machines d'emballage et machine d'emballage avec un tel distributeur Download PDF

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Publication number
EP1319596A2
EP1319596A2 EP02102756A EP02102756A EP1319596A2 EP 1319596 A2 EP1319596 A2 EP 1319596A2 EP 02102756 A EP02102756 A EP 02102756A EP 02102756 A EP02102756 A EP 02102756A EP 1319596 A2 EP1319596 A2 EP 1319596A2
Authority
EP
European Patent Office
Prior art keywords
clutch
dispenser
onto
film
driving means
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.)
Granted
Application number
EP02102756A
Other languages
German (de)
English (en)
Other versions
EP1319596A3 (fr
EP1319596B1 (fr
Inventor
Franco Tacchini
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.)
Officina Meccanica Sestese SpA
Original Assignee
Officina Meccanica Sestese SpA
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
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Application filed by Officina Meccanica Sestese SpA filed Critical Officina Meccanica Sestese SpA
Publication of EP1319596A2 publication Critical patent/EP1319596A2/fr
Publication of EP1319596A3 publication Critical patent/EP1319596A3/fr
Application granted granted Critical
Publication of EP1319596B1 publication Critical patent/EP1319596B1/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
    • B65B11/02—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
    • B65B2210/16—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles the web dispenser travelling around the article along a non-rotating ring

Definitions

  • the present invention relates to a dispensing system for a wrapping machine, wherein the amount of film dispensed is mechanically controlled.
  • wrapping machines are machines that are apt to package a load by wrapping it in a plastic film.
  • the wrapping of the load in the film may occur in different ways, for example with a fixed film bobbin and a rotating load, or with a fixed load and a rotating bobbin; in the latter case, the bobbin may be mounted onto a rotating boom arrangement or onto a circular ring.
  • More effective devices provide that the film passes between a pair of rollers, the downstream one of which has a higher peripheral speed, so as to obtain a uniform pre-stretching, adjustable as desired.
  • the most widespread solution on the market provides to adopt an electrical motor to drive one of the two rollers - the two rollers being connected to each other, for instance, by a pair of gears - and a dancing arm arranged between the pre-stretching unit and the load to be wrapped, through which the tension in the film may be detected and hence the electrical motor speed may be controlled.
  • the dancing arm is usually connected to a load cell, or to another position transducer, which generates a signal that is proportional to the film tension and is then sent to a control unit of the driving motor.
  • the pre-stretching unit and the respective driving and controlling device are mounted on a rotating support (for example in wrapping machines with a rotating boom or provided with a ring track), it is necessary to provide wiping electrical contacts in order both to supply the driving motor and to manage the controlling device.
  • these wiping contacts are often responsible for drawbacks and maintenance charges.
  • the object of the present invention is to solve the above-listed drawbacks.
  • it is meant to provide a film dispenser for a wrapping machine wherein the speed change of the pre-stretching unit may be achieved in a completely mechanical way, without the intervention of an electronic control unit; furthermore, according to another aspect, it is meant to provide a film dispenser wherein wiping contacts may be completely eliminated, and a wrapping machine comprising such a device.
  • fig. 1 is a sectional view of a first embodiment of the device according to the invention.
  • fig. 2 is an enlarged view of a detail of fig. 1;
  • fig. 3 is a schematic plan view of a ring wrapping machine provided with a device according to a second embodiment of the invention.
  • fig. 4 is an enlarged view of the device according to the invention shown in fig. 3;
  • fig. 5 is a sectional view taken along line V-V of fig. 4;
  • fig. 6 is a sectional view taken along the hatched line VI-VI of fig. 4.
  • fig. 6A is an enlarged view of a detail of fig. 6.
  • a dispenser is comprised, in a per se known manner, of a support plate 1 onto which a stretchable film bobbin 2, a pair of pre-stretching rollers P 1 and P 2 and a movable roller B are mounted.
  • the movable roller B is mounted oscillating, by means of a pair of arms 3a and 3b, onto a rotating shaft 4 provided with elastic return means 5.
  • the latter balance the oscillation of the movable roller B against the tension applied thereto by the stretchable film (not shown in fig. 1), which extends, passing thereon, from the bobbin 2 and the pre-stretching rollers P 1 and P 2, to the load CA to be wrapped (fig. 3).
  • Rolls P 1 and P 2 are connected to each other, for example through a pair of gears P 1 ' and P 2 ' that set a gear ratio such that the downstream gear P 2 rotates faster than the upstream gear P 1 , achieving the desired pre-stretching of the film.
  • the rotating shaft 4 carries, at one end thereof, a first geared wheel 6 engaging a second geared wheel 7 splined onto a supporting shaft 8 by means of a helical engagement.
  • a screw coupling is provided between the hub of the second gear 7 and the supporting shaft 8, which transforms the rotation of gear 7 into a translation thereof along the longitudinal axis of the shaft 8.
  • a lower half-clutch 10 - onto which a friction slipping element 11 is attached - is mounted onto the second gear 7 through a suitable ring bearing 9.
  • the friction slipping element is in the form of a circular rim.
  • an upper half-clutch 12 Opposed to the lower half-clutch 10, there is an upper half-clutch 12, axially fixed but rotatively mounted onto the shaft 8 by means of bearings.
  • the surface of the upper half-clutch 12 opposed to the slipping element 11 also has an analogous friction slipping element or is itself made of a friction slipping material.
  • the material with which the friction slipping element 11 is made is apt to transfer a torque between the two half-clutches 10 and 12 in a progressive way as the compressive force between said half-clutches varies. From this point of view, this material is quite different from the one employed for the traditional automotive clutches, which is apt to properly work in static condition only when high compressive force is applied between the two portions of the clutch.
  • the friction slipping material may be, for example, Iglidur® marketed by Igus GmbH.
  • the half-clutch 12 is further connected with an electrical motor M, for example through an engagement of gears 12a and Ma.
  • the lower half-clutch 10 is connected to the pre-stretching unit instead, preferably with the downstream roller P 2 , through a gear engagement 13.
  • the transmission to the pre-stretching unit may also be realised with the upstream roller P 1 , this would not be as much effective, because the operation would be affected by potential oscillations in the degree of film pre-stretching.
  • the motor M When the device is in use, the motor M is excited and made to rotate at a constant speed. Accordingly, the upper half-clutch 12 is made to rotate at a constant speed.
  • the translatable gear 7 When no film is required, i.e. when no tension is applied to the movable roller B, the translatable gear 7 is in its totally lowered position (in the view of fig. 2) and therefore the two half-clutches 10 and 12 are kept spaced apart and no torque is transferred from the motor M to the lower half-clutch 10.
  • this arrangement represents a self-controlled dispensing system; in fact, the more film the system requires - which corresponds to an increase in the film tension - the more the movable B is biased, which results in more pressure on the slipping contact 11 and in a higher torque being transferred from the motor M to the pre-stretching unit, therefore in an increased dispensing of film; vice versa, when the system requires less film, the tension loosens, therefore the movable roller B returns towards its rest position, thus a lower pressure is applied between the two engaging half-clutches 10 and 12, with a subsequent transfer of a lower torque and a decrease in the dispensing of the film.
  • the constant rotation speed of the motor M is advantageously set like the speed required in order to dispense the maximum film quantity that the system is envisaged to require.
  • the rotation direction of the translatable wheel 7, which brings the two half-clutches 10 and 12 close to each other, is opposed to the rotation direction of the half-clutch 12. This prevents the natural tendency of the engagement to become tighter and thus favours a prompt release and an immediate decrease of film dispensing as soon as the film tension onto the movable roller B is released.
  • the above described controlling device being completely mechanical, ensures a proportional, direct and virtually instant reaction, which does not cause instability in the control cycle, as may occur with the prior art.
  • the embodiment shown so far may be applied onto a wrapping machine wherein the support plate 1 is mounted onto a rotating boom or onto a ring track, or also in a fixed position with a rotating load.
  • FIG. 3 Another embodiment of the invention, typically applicable onto a ring track wrapping machine, is shown in figs. 3-6.
  • a typical annular structure A is schematically shown, which is vertically translatable on two columns of a wrapping machine, onto which a supporting plate 100 is movably mounted.
  • the plate 100 is translatably mounted onto tracks of the annular structure A by means of a series of rolling wheels R 1 , R 2 , R 3 and is fixed onto a rotating driving rim T, lying onto bearings Ci circumferentially placed on the annular structure A.
  • the driving rim T and the plate 100 are made to rotate through a driving belt CT driven by a motor MT (fig. 5), fixedly placed outside the annular structure A.
  • a stretchable film P is extended from a bobbin 102 to a pre-stretching unit P 10 and P 20 , then around an intermediate roller 104a, and finally onto a movable roller B 10 .
  • the movable roller B 10 is connected, through arms 103, to a rotating shaft 104, which also supports the intermediate roller 104a, integral with a first driving wheel 106.
  • the rotation of the shaft 104 is opposed by elastic return means 105.
  • the gear wheel 106 is connected, through a chain 106a, to a translatable gear wheel 107, mounted through a helical engagement onto a supporting hollow stand 107a, wherein a transmission shaft 108 is coaxially rotatably mounted.
  • the translatable gear 107 carries a lower half-clutch 110 apt to engage another upper half-clutch 112 through a friction slipping rim 111.
  • the upper half-clutch 112 is splined onto the transmission shaft 108, integral with the downstream roller P 20 of the pre-stretching unit.
  • the lower half-clutch 110 has the shape of a bush, on the outer surface of which a groove 110a is provided.
  • a second driving belt D - winding as much as possible, with the assistance of a belt tightener, around said bush 110 and then adhering to a track D1 integral with the annualar structure A - is apt to be engaged into groove 110a (figs. 4 and 5).
  • the second driving belt D which is static relative to the track D1, makes the bush 110 rotate.
  • the movement of the supporting plate 100 causes the rotation of the bush 110, which is the driving member of the dispenser, similar to the function of the motor M in the first embodiment illustrated.
  • the operation is otherwise identical to the one described above.
  • the transmission ratio between the annular track D1 and the rotating bush 110 it is ensured that the device is apt to dispense the maximum quantity of film required by the system, depending on the peripheral rotation speed of the device on the annular structure A.
  • This second embodiment also achieves the second object set in the premises, i.e. that of totally avoiding the use of any sliding contacts in order to transfer electrical power from outside the wrapping machine to the rotating dispenser.
  • the kinematic mechanism which causes the engaging half-clutches to get closer to each other, depending on the movable roller displacement may have different shapes. Besides, it is not necessary that the movable roller be supported oscillatorily, as it may also be translatable. Furthermore, the movable roller may be equally substituted by other devices, the displacement of which depends on the stretchable film tension.
  • the outer driving system illustrated in figs. 4-6, it is to be considered purely illustrative, as it is possible to adopt many different solutions to make the dispenser rotate on the carrying ring structure.
  • the driving belt apt to drive the bush of the slipping clutch may be substituted by similar elements, as long as the movement of the device around the annular structure is exploited in order to drive the dispenser.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Advancing Webs (AREA)
  • Pallets (AREA)
EP02102756A 2001-12-13 2002-12-13 Distributeur réglé mécaniquement pour machines d'emballage et machine d'emballage avec un tel distributeur Expired - Lifetime EP1319596B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20012648 2001-12-13
IT2001MI002648A ITMI20012648A1 (it) 2001-12-13 2001-12-13 Dispositivo di erogazione per fasciapallet a controllo meccanico e fasciapallet ottenuto con tale dispositivo

Publications (3)

Publication Number Publication Date
EP1319596A2 true EP1319596A2 (fr) 2003-06-18
EP1319596A3 EP1319596A3 (fr) 2003-10-22
EP1319596B1 EP1319596B1 (fr) 2006-02-01

Family

ID=11448695

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02102756A Expired - Lifetime EP1319596B1 (fr) 2001-12-13 2002-12-13 Distributeur réglé mécaniquement pour machines d'emballage et machine d'emballage avec un tel distributeur

Country Status (5)

Country Link
EP (1) EP1319596B1 (fr)
AT (1) ATE316903T1 (fr)
DE (1) DE60208974T2 (fr)
ES (1) ES2256411T3 (fr)
IT (1) ITMI20012648A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8079201B2 (en) * 2006-07-07 2011-12-20 Aetna Group S.P.A. Wrapping machine and wrapping methods
EP2468635A1 (fr) * 2010-12-27 2012-06-27 Pomatec di Podeschi Mauro Machine d'emballage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590746A (en) * 1981-09-30 1986-05-27 International Packaging Machines, Inc. Constant tension stretch wrapping machine
US4934123A (en) * 1988-02-25 1990-06-19 Roy Salzsauler Carriage
EP0842850A2 (fr) * 1996-11-13 1998-05-20 Lantech Technology Investment Corp. Dispositif et procédé pour envelopper une charge avec contrÔle de la tension d'enveloppement
JPH11165705A (ja) * 1997-11-28 1999-06-22 Oji Seitai Kk スパイラル式ストレッチ包装機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590746A (en) * 1981-09-30 1986-05-27 International Packaging Machines, Inc. Constant tension stretch wrapping machine
US4934123A (en) * 1988-02-25 1990-06-19 Roy Salzsauler Carriage
EP0842850A2 (fr) * 1996-11-13 1998-05-20 Lantech Technology Investment Corp. Dispositif et procédé pour envelopper une charge avec contrÔle de la tension d'enveloppement
JPH11165705A (ja) * 1997-11-28 1999-06-22 Oji Seitai Kk スパイラル式ストレッチ包装機

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 11, 30 September 1999 (1999-09-30) & JP 11 165705 A (OJI SEITAI KK), 22 June 1999 (1999-06-22) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8079201B2 (en) * 2006-07-07 2011-12-20 Aetna Group S.P.A. Wrapping machine and wrapping methods
US8250838B2 (en) 2006-07-07 2012-08-28 Aetna Group Spa Wrapping machine
US8448412B2 (en) 2006-07-07 2013-05-28 Aetna Group S.P.A Wrapping method
EP2468635A1 (fr) * 2010-12-27 2012-06-27 Pomatec di Podeschi Mauro Machine d'emballage
ITRA20100042A1 (it) * 2010-12-27 2012-06-28 Pomatec Di Podeschi Mauro Macchina fasciatrice.

Also Published As

Publication number Publication date
DE60208974D1 (de) 2006-04-13
ES2256411T3 (es) 2006-07-16
EP1319596A3 (fr) 2003-10-22
ITMI20012648A1 (it) 2003-06-13
EP1319596B1 (fr) 2006-02-01
DE60208974T2 (de) 2006-11-02
ATE316903T1 (de) 2006-02-15

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