EP3351479A1 - Bandumreifungsmaschine mit einer verbesserten einheit zum bewegen des bandes - Google Patents

Bandumreifungsmaschine mit einer verbesserten einheit zum bewegen des bandes Download PDF

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Publication number
EP3351479A1
EP3351479A1 EP18152024.8A EP18152024A EP3351479A1 EP 3351479 A1 EP3351479 A1 EP 3351479A1 EP 18152024 A EP18152024 A EP 18152024A EP 3351479 A1 EP3351479 A1 EP 3351479A1
Authority
EP
European Patent Office
Prior art keywords
strap
drive wheel
wheel
tensioning
counter
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Withdrawn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
EP18152024.8A
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English (en)
French (fr)
Inventor
Massimiliano Ubertini
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.)
Messersi Packaging Srl
Original Assignee
Messersi Packaging 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 Messersi Packaging Srl filed Critical Messersi Packaging Srl
Publication of EP3351479A1 publication Critical patent/EP3351479A1/de
Withdrawn legal-status Critical Current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
    • 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 relates to a strapping machine, namely a machine used to seal packages with a plastic tape of various thicknesses and widths, called a "strap" or "band".
  • the invention relates to an innovative strap delivery, recall and pulling unit in the machine. More particularly, the invention relates to a mechanical system for changing automatically from the step for fast recall of the strap to the strap tensioning step.
  • the strap delivery, recall and tensioning unit is extremely important for determining the performance characteristics of the entire machine which may be obtained. Firstly, this unit is important for determining the speed with which most of the operations resulting in the formation of a strapped package may be performed. Secondly, the strap being recalled must not strike violently the product to be packaged so as to avoid damaging it and/or avoid being damaging itself on any corners or projecting parts of the package. Finally, any folding or bending of the strap which may be caused during the delivery or recall operations may produce a defect in the strap or, worse still, may result in jamming of the machine.
  • One possible solution in the strapping machines according to the prior art is to performing delivery and recall of the strap around a product to be strapped by means of at least one pair of wheels (a drive wheel and counter-pressure wheel) which push (during delivery) and pull (during recall) the strap at high speeds (for example, within a range 4 to 7 m/s) so as to reduce the working time needed to process the single product to be packaged, and a second device which performs tensioning of the strap at a slow speed.
  • a drive wheel and counter-pressure wheel which push (during delivery) and pull (during recall) the strap at high speeds (for example, within a range 4 to 7 m/s) so as to reduce the working time needed to process the single product to be packaged
  • a second device which performs tensioning of the strap at a slow speed.
  • the contact pressure between the drive wheel and the counter-pressure wheel must therefore be adjusted so as to allow the drive wheel to pass lightly over the strap.
  • an electric sensor detects the stoppage thereof.
  • the various systems for subsequently tensioning the strap to a desired value are than activated by means of this signal.
  • the object of the present invention is to provide a strapping machine provided with a simplified system for changing from the recall speed to the tensioning speed (which may also be 40 times less than the recall speed) and for speeding up the working cycle.
  • This machine comprises an outlet for a strap to be wound around a product and a strap delivery, recall and tensioning system, and said system comprises: a drive unit for delivering and recalling the strap, composed of a first drive wheel and a counter-pressure wheel which rests against the first drive wheel with the strap arranged in between under the action of a first spring member; a second tensioning drive wheel which is kept spaced from the counter-pressure wheel by means of a second spring member and around which the strap passes directed from the drive unit towards the outlet of the strapping machine; and a mechanical system for changing from the recall step to the strap pulling step, comprising the second tensioning drive wheel which, when a predetermined tension value of the strap is exceeded during recall of the strap guided by the first drive wheel at a first speed, is pulled by the strap so as to move against the action of the second spring member and pushed against the counter-pressure wheel with the strap arranged in between so as to displace the counter-pressure wheel
  • a strapping machine (indicated generally by 40) comprises a reel (for simpler illustration not shown in the figures) which feeds a strap 12 to the machine, a system 11 for delivering, recalling and tensioning the strap 12 and strap gripping, welding and cutting units (not shown in the figures).
  • the gripping, welding and cutting units are substantially known per se and may be imagined by the person skilled in the art. They will therefore not be further described or illustrated.
  • FIG. 1 shows in greater detail the system 11 for delivering, recalling and tensioning the strap 12.
  • This system comprises an inlet 9, to which the strap 12 is fed by the feeder reel, and an outlet 10, from where the strap is directed towards a packaging zone where the pack to be wound with the strap is arranged.
  • the strap enters via the inlet 9 and passes into a delivery and recall drive unit 13 of the system 11. It then travels along the periphery of a second tensioning drive wheel 16 which is kept detached from the counter-pressure wheel 15 by means of a spring member 17, creating an arc which may be equal, for example, to about 180° along its path, until it exits from the outlet 10 towards the product to be strapped.
  • the drive unit 13 comprises a first delivery and recall drive wheel 14 and a counter-pressure wheel 15 between which the strap passes, so that usually the counter-pressure wheel rests against the drive wheel with the strap arranged in between.
  • the first drive wheel 14, which with its rotation defines a first speed for delivering and recalling the strap 12, has preferably its axis of rotation 32 fixed and secured to the frame 8 of the strapping machine.
  • the counter-pressure wheel 15 is movable in a direction transverse to its axis of rotation so as to be able to move away from the first drive wheel 14 and is pushed into contact with the first drive wheel 14 by a second spring member 20.
  • the second spring member 20 for example, is mounted on a rod 21 which connects the axis of the wheel 15 to an articulated joint supported by a lever 26 pivoted at 27.
  • Guiding means (not shown) define the direction (for example, substantially vertical direction) along which the wheel 15 may move when moving away from the drive wheel 14.
  • the second tensioning drive wheel 16 is pivotably mounted at 22 on a first lever 6 pivoted on a pin 24 so as to be also movable in a direction transverse to its axis of rotation 22.
  • the rotational motor 18 may operate continuously the free wheel 19 at a second speed (less than that produced by the strap driving movement of the drive wheel 14) in the opposite direction to the direction of delivery of the strap 12. Consequently, as will become clear below, the motor 18 may suitably drive at the second slower speed the second tensioning drive wheel 16 when it is not rotationally driven at a fast speed by the strap pulled during recall by the wheel 14. It should be noted that the strap 12 is not braked by the second tensioning drive wheel 16 during the recall step, since the strap 12 in this condition is biased so as to remain on the outside of the tensioning drive wheel 16, without any or with only limited contact thereon.
  • Both the first drive wheel 14 and the second tensioning drive wheel 16 may be operated by the same rotational motor 18 by means of two suitable transmissions which are able to achieve the desired two different speeds of these wheels and therefore of the strap driving speed.
  • the motor 18 may have on its shaft a pulley 43 which drives a toothed belt 44 which causes rotation of the first drive wheel 14.
  • the toothed belt 44 may also operate an input pulley 46 of a reduction unit 33.
  • the reduction unit 33 has preferably an output with a gearwheel 42 which via the transmission chain 30 operates a gearwheel 41 which causes rotation of the free wheel 19. Both or either one of the chain and reduction unit may be present, depending on the desired transmission ratios and/or the relative positions of the various components to be operated.
  • the recall step starts and during this step the motor 18 reverses the direction of rotation such that the first drive wheel 14 reverses the direction of rotation and, together with the counter-pressure wheel 15, recalls the strap 12 from outside through the outlet 10.
  • the strap 12 comes into contact with the second tensioning drive wheel 16 because the second tensioning drive wheel 16 is located upstream of the first drive wheel 14 and the counter-pressure wheel 15 which, instead, are situated downstream of the recall operation.
  • the free wheel 19 allows the second tensioning drive wheel 16 to be disengaged from the rotational motor 18 and to rotate fast at the recall speed determined by the first drive wheel 14.
  • the tension of the strap 12 starts to act on the wheel 16, tending to displace it against the action of the spring member 17 (lowering it as shown in Figure 1 ).
  • the lever 6 on which the second tensioning drive wheel 16 is mounted - the latter rotating rapidly at the first speed, driven by the strap 12 which is pulled in turn by the first driving wheel 14 - is biased so as to rotate on the pin 24 in the clockwise direction until it comes into contact with the counter-pressure wheel 15.
  • the counter-pressure wheel 15 under the pressure exerted by the second tensioning drive wheel 16, overcomes the thrust of the second spring member 20 and is detached from the first drive wheel 14.
  • the strap 12, at this point, is pressed between the second tensioning drive wheel 16 and the counter-pressure wheel 15 and, since first drive wheel 14 is no longer acting on the strap, the action of the free wheel 19 is triggered and this engages the wheel 16 and thus causes this second tensioning drive wheel 16 to rotate at the predefined second speed (for example determined by the speed reduction unit 33 and the corresponding transmission which connects it to the motor), resulting in driving of the strap being recalled at a speed slower than the first speed (for example determined by the rotational motor 18 and by the corresponding belt transmission 44), but with a greater driving torque produced by the different transmission ratio.
  • the predefined second speed for example determined by the speed reduction unit 33 and the corresponding transmission which connects it to the motor
  • the change in speed may occur very rapidly (approximately a few milliseconds), owing to the fact that, at a speed of the strap equal to a few metres per second, only a very small displacement of the second tensioning drive wheel 16 and the counter-pressure wheel 15, for example about 1 mm, is needed, in order to disengage the wheel 14 and engage the wheel 16, and the impact of the strap 12 on the strapped product is absorbed by the spring member 17 and by the spring member 20.
  • a suitable stop device 30 is provided, said device being sensitive to the displacement of the wheels 15 and 16 due to tensioning of the strap.
  • Figures 1 and 3 show a preferred embodiment of this tensioning stop device 30.
  • the stop device 30 comprises a roller 23, which is suitably positioned underneath the counter-pressure roller 15 so as to be displaced (against the action of an associated spring member 25) by the thrust of the counter-pressure wheel 15 after a predetermined displacement thereof, so as to allow operation of a stop microswitch 28 which interrupts the pulling action (for example stopping the motor).
  • the roller 23 may be mounted for its movement (transverse to its axis of rotation) on a third lever 26 pivoted on a rotatable pin 27 on which a fourth lever 29 is in turn fixed ( Figure 3 ).
  • a third lever 26 pivoted on a rotatable pin 27 on which a fourth lever 29 is in turn fixed ( Figure 3 ).
  • the two levers 27 and 29 perform an integral movement about the axis of the pin 27 determined by the thrust of the counter-pressure wheel 15 on the roller 23.
  • the levers 26 and 29 (and consequently the roller 23) are kept in position by the thrust exerted by a third spring member 25.
  • a second lever 7 may be provided and may be advantageously pivoted on the pin 24 so as to be integrally connected to the first lever 6 on which the second drive wheel 16 is mounted.
  • the second lever 7 continues to be made to rotate about the pivot 24 until it operates the switch 28, while the roller 23, in turn, moves against the action of the third spring member 25, said action being transmitted via the pivot from the fourth lever 29 to the third lever 26.
  • the resistance produced by the third spring member 25 is greater than that of the second spring member 20 so as to allow the spring member 20 to reach the end of its travel path.
  • the final tensioning action on the strap is therefore advantageously adjusted substantially by the spring member 25 alone.
  • the load of the spring member 25 can be advantageously adjusted by means of a compression knob 31 so as to obtain the desired tensioning of the strap during pulling.
  • operation of the microswitch occurs owing to the fact that a locating element 19 is positioned on the second lever 7 and, upon reaching a predefined position, operates the microswitch 28.
  • the lever 7 may also have guiding elements 47 which guide the strap towards the wheel 15.
  • the working cycle time is also substantially reduced.
  • the above description of an embodiment applying the innovative principles of the present invention is provided by way of example of these innovative principles and must therefore not be regarded as limiting the scope of the rights claimed herein.
  • the support systems for the wheels which allow displacement thereof by the strap pulling action may be different from those shown.
  • suitably shaped sliding guides may be used.
  • the machine may also comprise any other mechanism or accessory device known for these types of machines.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
EP18152024.8A 2017-01-19 2018-01-17 Bandumreifungsmaschine mit einer verbesserten einheit zum bewegen des bandes Withdrawn EP3351479A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102017000005654A IT201700005654A1 (it) 2017-01-19 2017-01-19 Macchina reggiatrice con gruppo perfezionato di movimentazione della reggia

Publications (1)

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EP3351479A1 true EP3351479A1 (de) 2018-07-25

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EP18152024.8A Withdrawn EP3351479A1 (de) 2017-01-19 2018-01-17 Bandumreifungsmaschine mit einer verbesserten einheit zum bewegen des bandes

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EP (1) EP3351479A1 (de)
IT (1) IT201700005654A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900005974A1 (it) 2019-04-17 2020-10-17 Messersi Packaging Srl Stazione di reggiatura con gruppo di reggiatura ruotabile

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0095643A2 (de) * 1982-05-29 1983-12-07 Hoesch Aktiengesellschaft Vorschub- und Spannvorrichtung für ein um ein Packstück zu spannendes Umreifungsband
EP1177978A1 (de) * 2000-07-31 2002-02-06 Strapack Corporation Bandumreifungsgerät und Verfahren für Verpackungssystem
WO2015117254A1 (de) * 2014-02-10 2015-08-13 Orgapack Gmbh Spanneinrichtung für eine umreifungsvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0095643A2 (de) * 1982-05-29 1983-12-07 Hoesch Aktiengesellschaft Vorschub- und Spannvorrichtung für ein um ein Packstück zu spannendes Umreifungsband
EP1177978A1 (de) * 2000-07-31 2002-02-06 Strapack Corporation Bandumreifungsgerät und Verfahren für Verpackungssystem
WO2015117254A1 (de) * 2014-02-10 2015-08-13 Orgapack Gmbh Spanneinrichtung für eine umreifungsvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900005974A1 (it) 2019-04-17 2020-10-17 Messersi Packaging Srl Stazione di reggiatura con gruppo di reggiatura ruotabile

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Publication number Publication date
IT201700005654A1 (it) 2018-07-19

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