EP2460732A1 - Dispositif d'ajustement de la tension dans une tête de cerclage et machine de cerclage correspondante - Google Patents

Dispositif d'ajustement de la tension dans une tête de cerclage et machine de cerclage correspondante Download PDF

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Publication number
EP2460732A1
EP2460732A1 EP11191533A EP11191533A EP2460732A1 EP 2460732 A1 EP2460732 A1 EP 2460732A1 EP 11191533 A EP11191533 A EP 11191533A EP 11191533 A EP11191533 A EP 11191533A EP 2460732 A1 EP2460732 A1 EP 2460732A1
Authority
EP
European Patent Office
Prior art keywords
strap
star
strapping
recovery
wheel
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Withdrawn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
EP11191533A
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German (de)
English (en)
Inventor
Cesarino Maggioni
Gian Luigi Rossi
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
Application filed by Officina Meccanica Sestese SpA filed Critical Officina Meccanica Sestese SpA
Publication of EP2460732A1 publication Critical patent/EP2460732A1/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Withdrawn legal-status Critical Current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
    • B65B13/00—Bundling articles
    • B65B13/18—Details of, or auxiliary devices used in, bundling machines or bundling tools
    • B65B13/22—Means for controlling tension of binding means

Definitions

  • the present invention refers to a tension adjustment device in a strapping head for strapping machines.
  • a very popular wrapping technique is that of wrapping tightly a load to be transported with one or more strapping loops.
  • the strap is a thin ribbon, normally made of plastic material (but in some cases also of metal material), which is tightly wound loopwise around a load, closing it permanently through welding points between the two terminal edges.
  • the welding prevents an accidental reopening of the strap loop, which must then be severed to free the wrapping.
  • All strapping machines substantially resort to a strapping head which has two complementary and integrated functions: on the one hand, the launch and subsequent recovery and tightening of the strap around the product to be wrapped and, on the other, the welding of the two terminal edges.
  • a single strapping head mounted below the transit plane upon which the load to be packaged is running, incorporates a series of movement devices and members which perform all the above-said functions, i.e. they feed and launch the strap around the load, starting from a strap storage reel, block the free end and recovery or draw back the base portion, until they choke a strap loop around the load; finally, they perform the welding in the loop closing area and severe it from the rest of the strap which comes from the reel.
  • One of the critical steps of the strapping process is that of the strap recovery or draw back, after the launch thereof around the load to be wrapped, which also determines the tightening degree of the wrapping.
  • a free end of a strap is launched onto a guiding track around the load to be wrapped, until it ends in correspondence of a welding head, where it is gripped and retained; once a wide loop has been performed around the load (the annular guiding track is normally far wider than the section bulk of the load) it is necessary to close and choke the strap loop to ensure a suitable tight wrapping; to perform this operation, since the terminal end of the strap is kept gripped, the strap portion coming from the storage reel is typically recovered or rewound backwards, causing the strap-launching members to work backwards.
  • the launch and the recovery of the strap occur at high speeds, the launch typically occurring at speeds ranging between 2.5 and 5.5 m/sec.
  • the strap acceleration/deceleration timing must be managed adequately, especially during the recovery operation.
  • it is important to impart the adequate tension to the strap ribbon i.e. a force of a preset amount which, despite closely tightening the strap ribbon on the load, does not impair the integrity of the load (which event might occur, for example, with cardboard boxes or other stacks of collapsible material).
  • strapping heads comprising a complicated mechanism for the launch and recovery of the strap have already been offered on the market, which mechanism is provided with transmission wheels, mounted oscillating through elastic means.
  • various systems have been proposed, suited to detect the tensioning of the strap so as to interrupt operation upon reaching of the desired tension value.
  • an actuator acts on a transmission wheel whereon the base portion of the strap is kept in engagement, so as to recovery the strap from the launching track and obtain a tightening around the load.
  • the actuator In order to obtain the desired tension, it is necessary to interrupt the intervention of the actuator - which, per se, is capable of providing a tension far higher than the one desired for the specific type of strap and wrapping - upon reaching the desired tension.
  • the most intuitive adjustment systems resort to loading cells, which are capable of providing a signal directly proportional to the tension detected in the traction members: the signal is supplied to a control unit which provides to interrupt the tensioning action of the actuator upon reaching a preset value.
  • the adjustment of the tension value may be obtained simply through a potentiometer suitably arranged on an operator's control panel.
  • the object of the present invention is hence to provide a strapping head which, despite having a tension adjustment device of the latter type - i.e. relying on the displacement of a spring system - is also simple to adjust, overcoming the disadvantages of the prior art.
  • a tension adjustment device in a strapping head for a strapping machine, of the type comprising at least a plurality of transmission pulleys apt to perform the launch and recovery of a strapping ribbon, actuated by an actuation motor, as well as a yielding system moving in opposition to spring means according to the tension imparted to the strap by said transmission pulleys, which furthermore comprises a star-shaped wheel the rotation of which is proportional to the displacement of said yielding system moving in opposition to spring means, said star-shaped wheel comprising a plurality of equally-distanced marks detectable by a sensor/transducer apt to issue in correspondence a counting signal of the number of marks detected during the rotation of said star-shaped wheel, recovery of said strap ribbon performed by said actuation motor being stopped upon reaching a preset threshold of said counting signal.
  • the yielding control system moving in opposition to spring means comprises at least one linearly sliding rack which a rotation mechanism controlling said star-shaped wheel engages with.
  • the rack is controlled in displacement by an external wheel of a double epicyclic rotation mechanism, one input of which receives torque from said actuation motor and one output of which is a wheel for the recovery of said strap.
  • the cited marks are in the form of cut outs at the periphery of the star-shaped wheel and the sensor is an optical sensor.
  • a strapping head is provided, and a corresponding strapping machine, comprising at least one strap launch and recovery assembly which comprises a tension adjustment device of the strap as indicated above.
  • a strapping machine (not shown) consists, in a manner known per se, of a frame whereon a strap-launching track is arranged, arranged around a support and transit plane of a load to be packaged. Below the support plane, in correspondence of the entry to the launching track, a strapping head is arranged, conceptually known per se.
  • the strapping head typically comprises in sequence, in the launch direction of the strap, a launch and recovery assembly of the strap, provided with suitable actuation motors, and then a welding assembly, apt to block the free end of the strap (once launched and wound around the load to be packaged) against a remaining base portion of the strap and joining together these two portions, so as to define a closed strap loop tightened around the load to be packaged.
  • Fig. 1 shows a strapping head divided into two independent assemblies, as better described in a co-pending application by the same Applicant.
  • the strap launch and recovery assembly 1 is illustrated in the left portion of the drawing.
  • This launch and recovery assembly generally consists of a single-body 11 which includes and supports a series of transmission members, among which a pair of drawing pulleys 12 and 13, between which a third cooperation pulley 14 is arranged.
  • a sliding track 15 is provided in the upper portion of the single-body a sliding track 15 whereon a strap ribbon (not shown) is apt to slide, both in the launching step and in the recovery step.
  • the strap ribbon coming from a storage reel, enters the single-body assembly from the bottom (in relation to the attitude the strapping head has during operation), runs through transmission pulleys 12 and 13 and runs above on track 15.
  • the launch and recovery of the strap occurs according to principles known per se, through driving the pulleys 12 and 13 in one direction or in the other, through the drive made available by a motor M fastened to single-body assembly 11.
  • the traction imparted on the strap by lower pulley 13 and by an inner wheel reflects into a greater or smaller tensioning of the strap which produces the displacement of a yielding member in opposition to an elastic element, according to principles already known also from EP-A1-0795475 o EP-A1-0603868 in the name of the same Applicant.
  • pinion gear 20 represents the outer wheel of a double rotation epicyclical mechanism deputed to the strap tensioning, according to a principle already described in EP-A2-61620 .
  • Such epicyclical rotation mechanism consists of a series of gears clearly shown in the section view of fig. 6 .
  • a control wheel 30 is driven into rotation by a belt 31 wound around a motion pulley 32 of an electric motor M ( fig. 3 ).
  • Control wheel 30 is mounted integral in rotation with a drive shaft 33, which in turn meshes with satellite gears 34 of a first epicyclical rotation mechanism.
  • Said satellites are mounted on rotation pins integral with a satellite-carrier 35 which transmits the motion to a strap recovery mechanism.
  • satellite-carrier 35 makes up the inner wheel: the rotation of said wheel transmits alternately - through a second series of satellites 36 - either to a strap-driving wheel 37 (satellite-carrier of the second epicyclic rotation mechanism) or to the wheel 20 driving the rack 21 (outer wheel of the second epicyclic rotation mechanism).
  • This construction allows to distribute the torque coming from control wheel 30 to the inner wheel 37 for strap recovery and to pinion gear 20, according to the way of operation which will be described further on.
  • pinion gear 20 the rotation of which is opposed by spring 22 through rack mechanism 21, is furthermore meshed with an idle transmission wheel 23 which, in turn, drives into rotation a star-shaped wheel 24.
  • transmission wheel 23 engages with a terminal wheel 25 the shaft of which comes out from the body 11 with an outer pin 25a whereon star-shaped wheel 24 is keyed.
  • Star-shaped wheel 24 has a plurality of marks, preferably cutouts 24a, along the circumferential periphery thereof, for example 16 cutouts, which define a series of interruptions in the continuity of the material of wheel 24.
  • an optical sensor/transducer 26 is fastened, apt to detect the presence or absence of cutouts 24a.
  • the optical sensor detects the passage of cutouts 24a according to a visual axis orthogonal to the rotation plane of wheel 24.
  • Sensor 26 is act to issue and output an electric signal upon the detection of each cutout or upon the detection of the closed portion of wheel 24, between one cutout and the other. Thereby, during the rotation of star-shaped wheel 24, sensor/transducer 26 produces a step signal by which it is possible to count how many cutouts have passed in front of sensor 26. Since the rotation of star-shaped wheel 24 is integral with the rectilinear movement of rack 21, through sensor 26 it is possible to obtain a signal proportional to the displacement of rack 21, in terms of a counting of pulses starting from the home position (or travel end) of rack 21 (the home position is the one shown in fig. 4 wherein the rack is pushed towards the right travel end).
  • the pulse signal derived from sensor 26 is fed to a central control unit (not shown), wherein the tension adjustment by the operator occurs.
  • a central control unit not shown
  • the operator sets the number of pulses (equal to a certain travel of rack 21) at which the desired tension is reached on the strap, and beyond which the torque application of motor M for strap recovery must be discontinued to interrupt tensioning.
  • the setting of the desired tensioning is obtained through a step potentiometer, by which the number of pulses (possibly readable on a digital display) is set on the control unit corresponding to the desired tension.
  • a step potentiometer makes adjustment by the operator more intuitive also to the touch, which operator can develop the necessary adjustment sensitivity without necessarily having to read a numeric display.
  • the device according to the invention which comprises a rotation sensor connected to the rack movement, allows to achieve the desired results.
  • the rotation continuity of the star-shaped wheel does not require to move any reference or switch with respect to the rack, this removes any need to act on the machine upon changing the desired tension.
  • tension adjustment is obtained simply by acting on a control unit, indicating the number of pulses (received from the sensor/transducer) which must determine the detachment of the supply to the strap-recovery motor M.
  • a step potentiometer to achieve the adjustment of the number of pulses, a pleasant sensitivity is provided to the operator.
  • the impulse detection system may be replace by a conventional, but more expensive, angular encoder system.
  • cutouts 24a are equivalent to marks detectable by a sensor and said sensor is not necessarily of the optical type, but could also be of a magnetic type, or else. Accordingly, the term star-shaped wheels simply means a wheel having a number of detectable marks.
  • the yielding drive system moving in opposition to the spring, following the tension on the strap may also take up different shapes, provided they are suitable to obtain a proportional rotation of the star-shaped wheel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Packaging Of Special Articles (AREA)
EP11191533A 2010-12-02 2011-12-01 Dispositif d'ajustement de la tension dans une tête de cerclage et machine de cerclage correspondante Withdrawn EP2460732A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2010A002232A IT1402910B1 (it) 2010-12-02 2010-12-02 Disposizione di regolazione del tiro di una testa di reggiatura e relativa macchina di reggiatura.

Publications (1)

Publication Number Publication Date
EP2460732A1 true EP2460732A1 (fr) 2012-06-06

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Family Applications (1)

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EP11191533A Withdrawn EP2460732A1 (fr) 2010-12-02 2011-12-01 Dispositif d'ajustement de la tension dans une tête de cerclage et machine de cerclage correspondante

Country Status (2)

Country Link
EP (1) EP2460732A1 (fr)
IT (1) IT1402910B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201700001007A1 (it) * 2017-01-10 2018-07-10 Enrico Giampaoli Piastrino guida per reggiatrice
CN108647769A (zh) * 2018-03-19 2018-10-12 安徽蒂姆自动化科技有限公司 扎带的剪断计数防错设备
CN112027172A (zh) * 2020-08-27 2020-12-04 浙江双友物流器械股份有限公司 一种智能物流货物捆绑系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0061620A2 (fr) 1981-03-24 1982-10-06 OFFICINA MECCANICA SESTESE S.p.A. Dispositif d'alimentation et de mise sous tension d'un ruban d'emballage dans des machines de ficelage
FR2621555A1 (fr) * 1987-10-12 1989-04-14 Strapack Corp Dispositif de deroulement et de serrage de ruban pour machine de cerclage
EP0603868A1 (fr) 1992-12-23 1994-06-29 OFFICINA MECCANICA SESTESE S.p.A. Dispositif de commande d'alimentation de ruban dans une machine de cerclage
EP0795475A1 (fr) 1996-03-14 1997-09-17 OFFICINA MECCANICA SESTESE S.p.A. Dispositif de commande d'alimentation d'un ruban dans une machine de cerclage
US20020129866A1 (en) * 2001-03-15 2002-09-19 Czebatul Philip A. Powered band clamping under electrical control
WO2008103952A1 (fr) * 2007-02-23 2008-08-28 Enterprises International, Inc. Appareil et procédé pour appliquer une sangle autour d'un paquet d'objets

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0061620A2 (fr) 1981-03-24 1982-10-06 OFFICINA MECCANICA SESTESE S.p.A. Dispositif d'alimentation et de mise sous tension d'un ruban d'emballage dans des machines de ficelage
FR2621555A1 (fr) * 1987-10-12 1989-04-14 Strapack Corp Dispositif de deroulement et de serrage de ruban pour machine de cerclage
EP0603868A1 (fr) 1992-12-23 1994-06-29 OFFICINA MECCANICA SESTESE S.p.A. Dispositif de commande d'alimentation de ruban dans une machine de cerclage
EP0795475A1 (fr) 1996-03-14 1997-09-17 OFFICINA MECCANICA SESTESE S.p.A. Dispositif de commande d'alimentation d'un ruban dans une machine de cerclage
US20020129866A1 (en) * 2001-03-15 2002-09-19 Czebatul Philip A. Powered band clamping under electrical control
WO2008103952A1 (fr) * 2007-02-23 2008-08-28 Enterprises International, Inc. Appareil et procédé pour appliquer une sangle autour d'un paquet d'objets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201700001007A1 (it) * 2017-01-10 2018-07-10 Enrico Giampaoli Piastrino guida per reggiatrice
CN108647769A (zh) * 2018-03-19 2018-10-12 安徽蒂姆自动化科技有限公司 扎带的剪断计数防错设备
CN112027172A (zh) * 2020-08-27 2020-12-04 浙江双友物流器械股份有限公司 一种智能物流货物捆绑系统

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Publication number Publication date
ITMI20102232A1 (it) 2012-06-03
IT1402910B1 (it) 2013-09-27

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