WO2018203159A1 - Dispositif de coupe pour couper des objets en plastique - Google Patents

Dispositif de coupe pour couper des objets en plastique Download PDF

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Publication number
WO2018203159A1
WO2018203159A1 PCT/IB2018/052489 IB2018052489W WO2018203159A1 WO 2018203159 A1 WO2018203159 A1 WO 2018203159A1 IB 2018052489 W IB2018052489 W IB 2018052489W WO 2018203159 A1 WO2018203159 A1 WO 2018203159A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting
assembly
caps
motor
tabs
Prior art date
Application number
PCT/IB2018/052489
Other languages
English (en)
Inventor
Andrea Francesco BUSINARO
Original Assignee
Telerobot S.P.A.
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 Telerobot S.P.A. filed Critical Telerobot S.P.A.
Publication of WO2018203159A1 publication Critical patent/WO2018203159A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/08—Making a superficial cut in the surface of the work without removal of material, e.g. scoring, incising
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F2210/00—Perforating, punching, cutting-out, stamping-out, severing by means other than cutting of specific products
    • B26F2210/04—Making plastic pilferproof screw caps by cutting a tamper ring

Definitions

  • the object of the present invention is a cutting device for cutting plastic objects of the type as recited in the preamble of Claim 1.
  • the object of the present invention is a cutting device for objects such as caps, for example.
  • caps for food products have two main components: the lid portion and the tamper evidence portion designed to certify the proper closure of the food container.
  • rings comprised in the caps of ordinary bottles of liquids, such as beverages or water and so on, which are separated from the lid portion by means of small notches.
  • This method guarantees the protection of the food product in the container before it is used by a user.
  • the lid portion is usually separated from the tamper evidence portion by a plurality of tabs.
  • such machines comprise a rotary mechanism comprising spindles, arranged radially with respect to a central shaft, suitable to pick caps up from a continuous line of caps and suitable to compress said caps, including the lid portion and tamper evidence portion, onto a base support, which is normally rigid, by means of a cold plastic deformation process.
  • a cutting blade arranged on each spindle, is designed to remove the central tab arranged between the lid portion and the tamper evidence portion.
  • the finished caps are conveyed back onto a line and away from the processing machinery.
  • said machinery comprises a large number of internal components which result in increased complexity as well as higher costs.
  • each single spindle is costly, both technologically and economically.
  • the mechanical connections between the spindle, which rotates, and the actuators designed to operate the blades are complex and may result in inaccuracies which, in the long term, prevent the full optimisation of the production line.
  • the cutting systems do not take into account the positioning of the cap and of the base support and can therefore cause undesirable damage with loss of products and waste.
  • the technical purpose of the present invention is to develop a cutting device for plastic objects able to substantially overcome at least some of the inconveniences mentioned above.
  • one important aim of the invention is to provide a device that makes it possible to simplify the system and, therefore, the structure of the rotary plant used, for example, to couple the caps to the base supports and to cut one or more tabs.
  • Another important aim of the invention is to provide a cutting device for plastic objects that reduces the costs of production for processing machinery.
  • a further aim of the invention is to optimise the production of plastic objects, such as caps, by increasing the speed at which the caps are coupled and cut.
  • a further aim of the invention is to limit the damage to the plastic objects being processed in order to reduce the amount of waste that is produced.
  • Fig. 1 shows the cutting device for plastic objects according to the invention and the cutting member
  • Fig. 2 is an exploded view of a cap suitable to be processed by the assembly device
  • Fig. 3 is a perspective view of the cutting mechanism of the cutting device;
  • Fig. 4 shows a view from above of the cap and the base support in the assembly configuration;
  • Fig. 5 shows a view from above of the cap and the base support in the assembly configuration.
  • Fig. 6a is a side view of the cutting mechanism working in the preferred configuration
  • Fig. 6b is a side view of the cutting mechanism working in the alternative configuration
  • Fig. 7 shows the cutting device for plastic objects according to the invention and the positioning apparatus
  • Fig. 8a illustrates an example of comparison between the images acquired by the detectors according to the invention
  • Fig. 8b illustrates an example of a specimen image according to the invention
  • Fig. 9 is a spindle comprising the auxiliary control system according to the invention.
  • Fig. 10 is a diagram of the control means according to the invention.
  • measurements, values, forms and geometric data are to be considered without any measurement errors or inaccuracies due to production and/or manufacturing errors and, above all, without any slight divergence from the value, measurement, form or geometric data with which they are associated.
  • such terms when associated with a value, preferably indicate a difference of not more than 10% of said value.
  • the device 1 is preferably suitable to process plastic objects such as, for example, caps 2.
  • the caps 2 are preferably caps of a known type used mainly for closing Tetra-Pak ® containers used, for example, to contain fruit juice, milk and so on.
  • the caps 2 comprise a lid portion 20 and a tamper evidence portion 21.
  • the lid portion 20 is, for example, a lid comprising one or more portions and preferably comprises a portion defining a screw cap of a known type.
  • the tamper evidence portion 21 is, instead, an element outside of the lid portion 20 suitable to guarantee that the product contained in the food container has not been tampered with.
  • It may comprise holes for coupling to external elements.
  • the lid portion 20 and the tamper evidence portion 21 are two distinct elements joined by one or more tabs 22.
  • the lid portion 20 and the tamper evidence portion 21 are joined by at least three tabs 22 and, more appropriately, three tabs 22.
  • the device 1 is suitable to cut at least one of the tabs 22 and, more appropriately, the tab 22 arranged in a central area.
  • the cutting of the central tab 22, in particular, is due to the fact that before being coupled to a base support, the cap 2 is designed to guarantee compliance with the standard strength requirements established by current regulations.
  • caps 2 are, preferably, suitable to be coupled to a base support 6.
  • Said base support 6 is substantially at least partially counter-shaped with respect to the cap 2.
  • the base support 6 comprises a portion, of a known type, suitable to screw the cap 2 and a portion preferably comprising a number of protuberances suitable to be inserted into holes provided in the tamper evidence portion 21 .
  • the device 1 is suitable to join the base support 6 and the cap 2 by means of a cold plastic deformation process.
  • the cap 2 and the base support 6 are, for example, joined by pushing them together and in such a way as to force the lid portion 20 to engage the thread on the base support 6 and to deform the protuberances by compression in order to join the tamper evidence portion 21 to the base support 6.
  • the device 1 further comprises at least part of an assembly line 3.
  • the assembly line 3 may comprise conveyor rollers of a known type, or other types of means suitable to define an assembly path 3a.
  • the assembly line 3 defines an assembly path 3a along which a plurality of base supports 6 and caps 2 are moved.
  • the line 3 also defines an assembly plane 3b.
  • Said assembly plane 3b is substantially a plane that includes the assembly path 3a.
  • the base supports 6 are moved along the assembly path and plane 3a, 3b, while the caps 2 are moved along the assembly path 3a, but may be moved on variable planes parallel to the assembly plane 3b.
  • the caps 2 are moved along the assembly path and plane 3a, 3b, while the base supports 6 are moved along the assembly path 3a, but may be moved on variable planes parallel to the assembly plane 3b.
  • the base supports 6 and the caps 2 are substantially inverted with respect to the preferred configuration.
  • the device 1 defines a transport configuration in which the caps 2 travel along the assembly path 3a substantially specularly with respect to the corresponding base supports 6 along a plane parallel to and at a distance from the assembly plane 3b and an assembly configuration in which the caps 2, while moving, are brought close to the corresponding base supports 6, or vice versa, and therefore occupy a position along a plane that is substantially close to the assembly plane 3b.
  • the assembly line 3 consists of a rotary machine and, therefore, the assembly path 3a is at least a portion of a circle.
  • the assembly line could also be a linear machine and the assembly path 3a substantially a straight line.
  • the device 1 further comprises an apparatus 31 and a plurality of spindles 30.
  • the apparatus 31 is a portion of the device suitable to move the spindles 30 along the assembly path 3a.
  • the apparatus 31 comprises a drive shaft suitable to rotate about an axis that is centred with respect to the assembly path 3a and perpendicular to the assembly plane 3b.
  • the apparatus 31 turns the spindles 30 and preferably comprises a brushless motor.
  • the apparatus 31 could also involve other solutions such as, for example, a mechanical link mechanism comprising gears and belts, or other system.
  • the apparatus 31 comprises a second encoder 32 suitable to detect the position, speed and angular acceleration of the apparatus 31 .
  • the second encoder 32 is preferably of the type known in the prior art.
  • the spindles 30 are thus made to move along the assembly path 3a by the apparatus 31 and are suitable to pick up the caps 2 or the base supports 6 in a controlled manner.
  • the spindles 30 pick up the caps 2 or the base supports 6 from an external portion of the assembly line 3 that is not part of the device 1 .
  • Each spindle 30 picks up a single cap 2 or base support 6 and, thus, the capacity of the device 1 depends on the number of spindles 30.
  • spindles 30 there are a plurality of spindles 30, for example twenty-four, although their number may differ also depending on the dimensions of the device 1 .
  • the spindles 30 are able to pick up the caps 2 or the base supports 6 by means of a coupling system, of a known type, which may be mechanical or electric or pneumatic.
  • the spindles 30 may comprise a jaw suitable to grip a cap 2, or they may have a pneumatic device suitable to create a vacuum in order to attach the cap 2 to a portion thereof generally facing the assembly path 3a.
  • the spindles 30 are suitable to push the caps 2 to join them to the base supports 6, or vice versa, arranged along the assembly path 3a on the assembly plane 3b.
  • the spindles 30 pick up the caps 2 in the way described above, when the spindles 30 move the caps 2 from the transport configuration to the assembly configuration.
  • the device 1 further comprises a cutting mechanism 4, a positioning apparatus 7 and control means 5.
  • the cutting mechanism 4 is preferably suitable to cut at least a part of the tabs 22 on the caps 2.
  • the cutting mechanism 4 is suitable to cut, in particular, the central tab 22 when the spindles 30 carry the caps 2 or the base supports 6 in the assembly configuration.
  • Cutting is in fact preferably performed when the base support 6 and the cap 2 have been joined to one another and properly positioned.
  • the cutting mechanism 4 could alternatively cut a side tab 22 or more than one tab 22.
  • the cutting mechanism 4 is not attached to any spindle 30.
  • the device 1 preferably comprises just one cutting mechanism 4, since, advantageously, the cutting mechanism 4 is able to cooperate with each spindle and thus with each base support 6 and cap 2 at a fixed position along the assembly path 3a.
  • the cutting mechanism 4 is preferably movably attached to part of the assembly line 3 in proximity to the path 3 and to the assembly plane 3a, 3b.
  • the cutting mechanism 4 thus defines a cutting direction 4a.
  • the cutting direction 4a is substantially the direction along which the cutting mechanism 4 and part of the cap 2 come into contact.
  • the cutting direction 4a defines an angle a with the assembly plane 3b.
  • the angle a is preferably comprised between 20 and 70 degrees and is more appropriately 45 degrees.
  • the cutting mechanism 4 further comprises movement means 40 and a cutting member 41.
  • the movement means 40 are preferably suitable to move the cutting member 41 along the cutting direction 4a so as to allow the cutting member to come into contact with a part of the tabs 22.
  • the movement means 40 thus define an axis of movement 40a.
  • the axis of movement 40a is, for example, perpendicular to the cutting direction 4a and the movement means comprise an alternator 40b and a support 40c.
  • Said alternator 40b is any device suitable to rotate about the movement axis 40a and, in particular, to change the rotational motion into alternating motion
  • the support 40c is preferably suitable to releasably couple the cutting member 41 .
  • the alternator is an eccentric cam which, as it rotates about the movement axis 40a, is able to translate the support 40c along the cutting direction 4a with an alternating motion.
  • the motion of the alternator 40b is transmitted to the support 40c via transmission means 40d.
  • the transmission means 40d are operationally connected to the alternator 40b and to the support 40c and consist of an ordinary crank mechanism.
  • the transmission means may be a bar hinged along part of the alternator
  • the movement means 40 may consist of members that rotate with an alternating motion comprising gears that interact with the support 40c.
  • the support consists, for example, of a portion comprising cavities suitable to interact with the surface of the rotating gear.
  • the cutting member 41 is preferably a blade.
  • Said blade may be of any kind, provided it is suitable to cut, for example, polymeric materials and in particular is of the type used in normal surgical scalpels.
  • the positioning apparatus 7 preferably comprises a first detector 70 and a second detector 71.
  • the detectors 70, 71 are video cameras suitable to detect a first image 60 and a second image 23, respectively.
  • the first image 60 is preferably an image of the base support 6 and the second image 23 is an image of the cap 2.
  • the images 60, 23 are preferably sections in a plane parallel to the assembly plane 3b of the base support 6 and of the cap 2, respectively.
  • the control means 5 are preferably suitable to control the movements of the device 1 and to acquire the signals coming from the components of said device 1 .
  • control means 5 are suitable to control and operationally interact with the cutting mechanism 4, the spindles 30 and the positioning apparatus 7.
  • control system 50 They thus comprise a control system 50, a motor 51 and an auxiliary control system 53.
  • the motor 51 is preferably operationally connected to the movement means 40 and is thus suitable to make the cutting member 41 move.
  • the motor 51 is a rotary motor, for example, of the brushless or electric or mechanical type.
  • a first encoder 52 is linked to the motor 51 .
  • the first encoder 52 is a device of the type known in the prior art and is suitable to detect the position, speed and angular acceleration of the motor 51 .
  • the control system 50 is thus preferably an apparatus suitable to control at least the motor 51 and the apparatus 31 .
  • control system 50 comprises an electronic processor suitable to interact with the first encoder 52 and the motor 51 .
  • the electronic processor comprises an electronic board of a known type and/or a numerical controller of a known type.
  • control system 50 is suitable to interact with the second encoder 32 and, in particular, the control system 50 is suitable to synchronise the first and the second encoder 52, 32.
  • control system 50 is suitable to control the motor 51 in such a way that a period of complete rotation of the motor 51 corresponds to the time in which the assembly line 3 covers the distance comprised between two spindles 30 along the assembly path 3a.
  • the cutting mechanism 4 advances and places the cutting member 41 in contact with a part of the tabs 22 and, in detail, with the central tab.
  • the spindles 30 bring the caps 2 from the transport configuration to the assembly configuration.
  • the auxiliary control system 53 is suitable to bring the caps 2 from the transport configuration to the assembly configuration.
  • the auxiliary control system 53 is suitable to translate and rotate the spindles 30 along directions perpendicular to the assembly path and plane 3a, 3b and comprises a third encoder 54.
  • the third encoder 54 is preferably an encoder of a known type suitable to detect the orientation of the spindles 30 with respect to the assembly path 3a.
  • the auxiliary control system 53 comprises a second actuator 53a and a first actuator 53b.
  • the second actuator 53a is preferably removably attached to the apparatus 31 and is suitable to translate along the directions perpendicular to the path and plane of assembly 3a, 3b.
  • the second actuator 53b could be a linear actuator of a known type, or could comprise a barrel cam suitable to guarantee the translation.
  • the second actuator 53a is suitable to allow the spindle 30 and thus a cap 2 to switch from the transport configuration to the assembly configuration.
  • the first actuator 53b is preferably removably attached to the spindle and to the second actuator 53a and is suitable to rotate the spindle 30 about the directions perpendicular to the assembly path and plane 3a, 3b.
  • the second actuator 53a is a linear brushless actuator and the first actuator 53b is a rotary brushless actuator.
  • the auxiliary control system 53 comprises a first and a second actuator 53b, 53a for each spindle 30.
  • control system 50 is suitable to process the signals arriving from the third encoder 54, the detectors 70, 71 and to control the auxiliary control system 53.
  • control system 50 defines a specimen image 8 preferably for each assembled cap 2 and base support 6.
  • the specimen image 8 is an image of the cap 2 and of the base support 6 in the assembly configuration.
  • Said specimen image 8 is, in particular, an image of comparison for the images 60, 23.
  • the detectors 70, 71 acquire the first image 60 and the second image 23, respectively, and the control means 5 are suitable to compare the images 60, 23 with the specimen image 8.
  • the first image 60 and the specimen image 8 define a first orientation 6a, while the second image 23 and the specimen image 8 define a second orientation 2a
  • the first orientation 6a defines the orientation of the base support 6 with respect to the assembly path 3a
  • the second orientation 2a defines the orientation of the cap 2 with respect to the assembly path 3a.
  • the specimen image 8 defines the first orientation 6a and the second orientation 2a in a plane parallel to the assembly path and plane 3a, 3b.
  • control means 5 calculate the angular displacement ⁇ between the first orientation 6a of the base support 6 and the second orientation 2a of the cap 2 calculated by comparing the images 60, 23 with the specimen image 8.
  • the auxiliary control system 53 rotates the spindle 30 holding the cap 2, of which the second image 23 has been acquired, at an angle equal to the angular displacement ⁇ in order to align the base support 6 and the cap 2.
  • the device 1 allows a plurality of base supports 6, arriving from part of an assembly line 3, to be moved along the assembly path 3a. At the same time the spindles 30 pick up a plurality of caps 2, in a synchronised manner.
  • a first image 60 is acquired, by the first detector 70, of the base support 6 passing in front of the detector 70 and a second image 23, by the second detector 71 , of the cap 2 passing in front of the second detector 71 .
  • the images 60, 23 are compared with a specimen image 8 in order to define a first and a second orientation 6a, 2a.
  • control means 5 calculate the angular displacement ⁇ between the orientations 6a, 2a.
  • control means in detail the control system
  • the spindle 30 turns the coupled cap 2 and base support 6 so that the orientations 6a, 2a are substantially perpendicular to the assembly path 3a so as to allow the cutting mechanism 4 to cut at least one tab 22 when driven by the motor 51 .
  • the motor 51 When it turns, the motor 51 translates the cutting member 41 along the cutting direction 4a and then allows the blade to return to the retracted position.
  • the cutting member 41 When the cutting member 41 is in the forwardmost position, it comes into contact with, for example, the central tab 22 of the cap 2 and cuts it.
  • cap 2 and the base support 6 are moved away by the device 1 along the remaining parts of the assembly line 3.
  • the device 1 according to the invention achieves some important advantages.
  • the device makes it possible to simplify the system and, thus, the structure of the rotary system used for coupling caps and base supports and for cutting the tabs.
  • Another advantage of the invention is that it reduces the costs of production for processing machinery.
  • a further advantage of the invention is that it optimises the cutting of plastic objects, in the specific example caps, and increases the machinery's processing speed.
  • another advantage of the invention is that it limits the damage to the caps being processed and so reduces the amount of waste produced.
  • assembly path 3a could be linear and not circular and the apparatus 31 could comprise rails along which the spindles 30 are moved.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Abstract

L'invention concerne un dispositif de coupe (1) pour couper des objets en plastique comprenant des capuchons (2) comprenant une partie couvercle (20) et une partie d'inviolabilité (21) joints par une pluralité de languettes (22), le dispositif (1) comprenant au moins une partie d'une ligne d'assemblage (3) de capuchons (2) définissant un trajet d'assemblage (3a) et un plan d'assemblage (3b) comprenant le trajet d'assemblage (3a) et le dispositif (1) comprenant une pluralité de broches (30) aptes à être déplacées le long du trajet d'assemblage (3a) au moyen d'un appareil (31) et aptes à saisir les capuchons (2) de manière commandée, les capuchons (2) étant déplacés le long du trajet d'assemblage (3a) par un élément choisi entre la partie de la ligne d'assemblage (3) ou les broches (30), le dispositif (1) comprenant un mécanisme de coupe (4) comprenant au moins un élément de coupe (41) apte à couper au moins une partie des languettes (22) des capuchons (2) étant déplacés le long du trajet d'assemblage (3a), le dispositif (1) comprenant en outre un moteur rotatif (51), le mécanisme de coupe (4) comprenant des moyens de déplacement (40) conçus pour déplacer l'élément de coupe (41) avec un mouvement alternatif le long d'une direction de coupe (4a), de façon à permettre à l'élément de coupe (41) de venir en contact avec une partie des languettes (22) pour découper au moins une partie des languettes (22) des capuchons (2), l'élément de coupe (41) étant relié au moyen de déplacement (40) relié au moteur (51), le moteur (51) étant apte à tourner autour d'un axe de rotation (40a) perpendiculaire à la direction de coupe (4a).
PCT/IB2018/052489 2017-05-05 2018-04-10 Dispositif de coupe pour couper des objets en plastique WO2018203159A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000049100A IT201700049100A1 (it) 2017-05-05 2017-05-05 Dispositivo di taglio per oggetti plastici
IT102017000049100 2017-05-05

Publications (1)

Publication Number Publication Date
WO2018203159A1 true WO2018203159A1 (fr) 2018-11-08

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Application Number Title Priority Date Filing Date
PCT/IB2018/052489 WO2018203159A1 (fr) 2017-05-05 2018-04-10 Dispositif de coupe pour couper des objets en plastique

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IT (1) IT201700049100A1 (fr)
WO (1) WO2018203159A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020148428A1 (fr) * 2019-01-17 2020-07-23 Finatec Holding Ag Dispositif et procédé de traitement de bouchons pour boisson

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1161611A (fr) * 1982-03-29 1984-02-07 Hamelin Inc. Methode et dispositif de production de capuchons a bague d'arrachement pour bouteilles
CN203792399U (zh) * 2014-03-10 2014-08-27 罗标荣 塑料瓶盖自动折边切环机

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1161611A (fr) * 1982-03-29 1984-02-07 Hamelin Inc. Methode et dispositif de production de capuchons a bague d'arrachement pour bouteilles
CN203792399U (zh) * 2014-03-10 2014-08-27 罗标荣 塑料瓶盖自动折边切环机

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020148428A1 (fr) * 2019-01-17 2020-07-23 Finatec Holding Ag Dispositif et procédé de traitement de bouchons pour boisson
CN113329851A (zh) * 2019-01-17 2021-08-31 费南泰克控股有限公司 用于加工饮料封盖的设备及方法
US11820035B2 (en) 2019-01-17 2023-11-21 Finatec Holding Ag Device and method for processing drinks closure caps

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