ES2222060B1 - AUTOMATIC PACKAGING MACHINE. - Google Patents

Abstract

Automatic packaging machine The packaging machine comprises a packaging forming device (DC) and a filling device (DL) linked by a transfer device (DT). The filling device (DL) comprises an endless vertical conveyor (44), which describes a path formed by an ascending vertical section and a descending vertical section linked by its ends by semi-circumferential sections, provided with one or more clamping mechanisms ( 56) of containers (3) which successively and sequentially occupy a container receiving position (3) at the lower end of the ascending section; at the upper end of the ascending section an opening position of packages (3); at the upper end of the descending section a container filling position (3); and at the lower end of the descending section a container closing position (3) by welding.

Description

Automatic packaging machine

Technical sector of the invention

The object of the invention is a machine of automatic packaging, particularly automatic packaging of powder products, solids, pasty, liquids, etc., such as for example juices, soft drinks, ground coffee, detergents, etc., in packaging in the form of bags obtained by forming a sheet of heat-weldable material.

Background of the invention

A wide variety of embodiments is known. of machines intended for automatic packaging of products in powder, solids, pasty, liquids, etc. in containers in the form of bags, obtained by forming a sheet of material heat sealable. In general, such automatic packaging machines they comprise a packaging forming device and a filling device, linked by means of a device that transfers containers from the forming device to filling device

In Fig. 1 it is represented schematically an embodiment of automatic packaging machine of the type described above. Essentially, the packaging machine automatic comprises a packaging device DC forming device in bag shape, a DT container transfer device and a DL filling device, arranged longitudinally. He DC packaging forming device is composed of about feeding means of a sheet of heat-sealable material 1, forming means 2 of containers 3 in continuous form in the form of bags and cutting means 4 to separate the containers 3 from the continuous shaped sheet. The DT transfer device of containers 3 comprises transport means 5 provided with suction nozzles for opening containers 3, for fill. And, the filling device DL is provided with about dispensers 6 and closing means 7 of filled containers 3.

In Fig. 2 another one is represented realization of automatic packaging machine of the type described. In this embodiment, as in the embodiment represented in the Fig. 1, the packaging machine comprises a device for DC conformation of packaging, a transfer device, not represented, and a DL filling device. Essentially, the DC packaging forming device does not differ from before described for the embodiment of Fig. 1, and elements Similar are designated with equal numerical references. He DL filling device is arranged above the device of DC conformation and comprises a rotary contour support 8 quadrangular, in which each of its sides is provided with holding means 9 of packages 3 for filling by 6 dispensers arranged on one of its sides.

In general, machine realizations of automatic packaging as described have as main inconvenient as described below. Once done filling the container with the product to be packaged, particularly in case of liquids, the displacement of the full container from the filling means to the closing means of the container, causes the product contained in the package is subject to acceleration and decelerations that cause significant variations in the level of product with respect to the edge of the container, and so much if the container full follows a linear path as a circular path, what which leads to the need to limit the speed of displacement of the full container to avoid spillage of the product and / or wetting of the area where the closure of the container filled by welding; consequently, such reduction of travel speed of filled containers prior to welding leads to a reduction in machine production of packing.

Explanation of the invention.

The automatic packaging machine object of the invention is of the type comprising a device of conformation of packages of heat-weldable material in the form of bags and a device for filling the bags with the product to packaging, linked by a transfer device, arranged below the filling device, which transfers containers from the forming device to the device fill.

The machine according to the invention is characterized because the transfer device transfers the containers from the packaging forming device to the filling device by vertical scrolling and horizontal scrolling of the containers, both displacements being carried out simultaneously, alternatively and coplanarly, and because the filling device comprises a frame on which a conveyor is arranged endless vertical that describes a path formed by a section ascending and by a descending stretch parallel and facing one with respect to the other, linked by their corresponding ends by semi-circumferential sections, the conveyor being without purpose provided with one or more packaging clamping mechanisms regularly distributed, scrollable simultaneously and so that each of them occupies successively and sequentially the end bottom of the ascending section, or container receiving position supplied by the transfer device, the end top of the ascending section, or opening position of containers for filling, the upper end of the descending section, or container filling position with the product to be packaged and the lower end of the descending section, or closing position by welding the containers filled with the product to be packaged, from where they are deposited on means of evacuation of full and closed containers.

The characteristics of the transfer device and the filling device described provide an innovative solution to the problems arising from the movement of full containers with the product to be packaged, prior to closing by welding. In fact, the fact that the displacement of the filled containers is carried out along a vertical path from the upper end of the descending section, where the packaging filling means are arranged, to the lower end of the descending section, where the means are arranged of closing by welding of the containers, it results in the level of the product in the container maintaining horizontality, regardless of the speed at which said movement is made. In this way, with the machine of the invention, it is possible, firstly, to avoid the spillage of the packaged product by accelerations and decelerations during the movement of the full container and / or the fouling of the welding areas, and secondly an increase of production of the machine with respect to those embodiments of automatic packaging machines in which the displacement of full containers, prior to welding, is carried out according to a rectilinear trajectory or
curvilinear

According to another characteristic of the machine of the invention, the transfer device comprises a frame provided with two parallel vertical axes and facing one respect of the other on which a box of tweezers is movable transfer, performing an alternative movement driven by a translation mechanism

It is also characteristic of the machine according to the invention that the transfer clamp box comprises a pair of drive pulleys of different diameter, coupled with solidarity and coaxially with respect to each other, and a pair of driven pulleys of different diameter coupled jointly and coaxially one respect on the other, both pairs of pulleys arranged vertically and coplanarly with respect to each other, the pair of pulleys being larger diameter linked by an outer drive belt and the pair of pulleys of smaller diameter linked by a belt of internal transmission, and the pair of driving pulleys being coupled to a drive mechanism that prints a rotating movement alternative, in accordance with the alternative movement that the translation mechanism prints to the tweezers box transfer.

Another feature of the invention consists in that the transfer clamp box is provided with two axes horizontal parallel to each other and located between the pair of drive pulleys and the pair of driven pulleys, adapted from so that on them they can be displaced both ways, performing an alternative movement, a plurality of tweezers transfer, coupled to the branches of the belts transmission.

According to another feature of the invention, a first transfer clamp is coupled to the upper branch of the outer drive belt; A second transfer clamp, adjacent to the first, is coupled to the upper branch of the inner drive belt; a third transfer clamp, adjacent to the second, is coupled to the lower branch of the inner drive belt; and a fourth transfer clamp, adjacent to the third, is coupled to the lower branch of the outer transmission belt, all adapted so that the alternative rotation of the driving pulleys causes the alternative displacement of the clamps transfer on the horizontal axes, so that the clamps of transfer coupled to the upper branches and the clamps of transfer coupled to the lower branches are related of positional symmetry with respect to a main transverse axis theoretical of the horizontal axes.

The invention is also characterized in that the translation mechanism comprises a cam to which it is coupled the power arm of a first-gen lever, whose arm resistant is in turn coupled to the foot of a connecting rod, while the crank head is attached to the caliper box of transfer, all adapted so that the rotation of the cam causes the reciprocating movement of the lever that the connecting rod transmits to the transfer clamp box.

According to another feature of the invention, the drive mechanism comprises a drive arm coupled by one end to the pair of drive pulleys and at the other end to the foot of a connecting rod whose head is in turn coupled to a crank linked to a fixed point.

It is also characteristic of the machine packaging of the invention that the transfer clamps are adapted to occupy two positions, a first position for the reception of a container from the packaging forming train and a second holding position of the container by a portion longitudinal centered.

Another feature of the invention consists in that the frame of the filling device comprises two axes horizontal parallel, to which two supports are coupled scrollable verticals on the horizontal axes in both senses, causing their mutual approach or estrangement, being the Endless conveyor coupled to vertical supports.

According to another feature of the invention, the endless conveyor comprises a shaft, coupled to the lower ends of the vertical supports and provided with two driving sprockets, and two driven sprockets, arranged at the upper ends of the vertical supports, the corresponding pairs of driving sprocket being linked and cogwheel driven by a transport chain, and being coupled to the respective transport chains the Four horizontal mechanisms for holding containers.

The invention is also characterized in that each clamping mechanism comprises a first horizontal axis of clamping, coupled at one end to a first chain of transport, so that it occupies a fixed position with respect to the same, and at the other end to a second transport chain, of so that it is transversely movable with respect thereto; and a second horizontal clamping axis located above the first horizontal clamping shaft, coupled at one end to the first transport chain, so that it is transversely movable with respect to it, and at the other end to the second chain of transport, so that it occupies a fixed position with respect to the same, the first horizontal axis of attachment of a first group of clamps and the second horizontal axis of clamping of a second group of clamps, leaving the clamps of both groups arranged so that a clamp of the first group and a corresponding clamp of the second group allow the holding a container, and being all adapted so that the displacement of the vertical supports on the axes horizontal of the frame causes the approach or distance of the clamps of a group with respect to the corresponding clamps of the another group, for adapting the distance that separates them at container dimensions

Brief description of the drawings

The attached drawings illustrate, by way of non-limiting example, an embodiment of the machine automatic packaging of the invention. In these drawings:

Figs. 1 and 2 represent schematically respective embodiments of automatic packaging machines known;

Fig. 3, is a schematic representation of the automatic packaging machine of the invention;

Fig. 4, is an elevation view of the device transfer of the machine of the invention;

Fig. 5, is a side view of the device of transfer of Fig. 4;

Fig. 6, is an elevation view of the device transfer according to the invention, in an operation other than the depicted in Fig. 4;

Fig. 7, is a side view of the device transfer and filling device of the machine invention; Y

Fig. 8, is an elevation view of the device of filling the machine of the invention.

Detailed description of the drawings

In Fig. 3 it is represented schematically and in perspective the automatic packaging machine according to the invention, which is described as an embodiment. In it is appreciated that the machine comprises a device of DC conformation of containers and a DL filling device, being linked both DC and DL devices using a device packaging transfer, which for the purpose of simplification has not has been represented in Fig. 3 and that has been represented in the Figs. 4 to 7, which transfers containers from the device DC conformation to the DL filling device.

The DC shaping device essentially comprises feeding means of a sheet 1 of material heat sealable; welding means 2 of containers 3 in the form of bags; and cutting means 4 to separate the containers 3 from the sheet 1 shaped continuously. In this embodiment, the cutting means 4 proceed to cut and separate the sheet 1 consisting of four packages 3, simultaneously.

In Figs. 4 and 5 it is appreciated that the device DT transfer comprises a contour frame 10 quadrangular provided with two vertical axes 11 arranged parallel and face to face with respect to each other and over which it is movable a box of transfer tongs 12, making a alternative vertical movement driven by a mechanism of translation 13 which will be described later.

The transfer clamp box 12 contains a pair of drive pulleys coupled in solidarity and coaxially a with respect to the other, of which the largest diameter drive pulley is the 14 and the smaller diameter drive pulley is the 15, and a couple of driven pulleys also coupled jointly and coaxially a with respect to the other, of which the pulley driven of greater diameter is 16 and the driven pulley of smaller diameter is 17, the pair of drive pulleys 14 and 15 being the pair of pulleys conducted 16 and 17 arranged horizontally and coplanarly. The larger diameter pulleys, drive pulley 14 and driven pulley 16, are linked by an outer drive belt 18, in so much that pulleys of smaller diameter, drive pulley 15 and pulley driven 17, are linked by a drive belt interior 19. Drive pulleys 14 and 15 are coupled to a drive mechanism 20 that will be described below and that prints a turning movement to drive pulleys 14 and 15 alternative, all of which is adapted so that the turn Simultaneous driving pulleys 14 and 15 cause displacement also simultaneous transmission belts in the senses A and B indicated in Fig. 4.

The transfer clamp box 12 also It contains two horizontal shafts 21, arranged between the pair of pulleys drives 14 and 15 and the pair of driven pulleys 16 and 17 and parallel one respect the other. To the two horizontal axes 21 are coupled four transfer clamps, indicated with the references 22 to 25, with displacement capacity in the Senses A and B. The first transfer clamp 22 is coupled to the upper branch of the outer drive belt 18; the second transfer clamp 23 is arranged adjacent to the first 22 and is coupled to the upper branch of the belt internal transmission 19; the third transfer clamp 24 is arranged adjacent to the second 23 and is coupled to the branch bottom of the inner drive belt 19; and the fourth clamp of transfer 25 is arranged adjacent to the third 24 and is coupled to the lower branch of the outer transmission belt 18.

The translation mechanism 13 comprises a cam 26 to which the power arm 27 of a lever is attached first genus 28 in which flucro 29 attached to a fixed point, in so much that the resistant arm 30, which forms an angle with the arm of power 27, is coupled to the foot of a connecting rod 31 whose head it is coupled to the transfer clamp box 12; the turn of cam 26, by means of a drive not shown, causes an alternative rotating movement of the lever around the flucro 29 and an alternative vertical translation movement of the connecting rod 31 and transfer caliper box 12. The mechanism of drive 20 comprises a drive lever 32 which by one of its ends are coupled to the pair of driving wheels 14 and 15, in so much so that its other end is coupled to the foot of a connecting rod 33, the rod head 33 being coupled to a crank 34 attached by a vertical support 35 to a fixed point 36.

In Fig. 5 it can be seen that each clamp of transfer comprises a fixed arm 37 and a mobile arm 38 horizontal, having the mobile arm 38 ability to displacement in both directions indicated C and D, the end being inside of the movable arm 38 attached to the sturdy arm 39 of a first-gen lever 40 whose power arm 41 is coupled to a pneumatic cylinder 42; all adapted so that the arm mobile 38 can occupy two positions, a first receiving a container 3, from the cutting means 4 of the device DC conformation, and a closed position (Fig. 5) in which the container 3 is held centrally by its upper end.

The operation of the device DT transfer is described below. In Fig. 7 you can see that the DT transfer device is arranged below of the filling device DL; the transfer clamp box 12 it is in a lower position for receiving containers 3; the transfer clamps 22 to 25, are in the position of closing, holding each of them centered a corresponding container 3 at its upper end; and how do I know seen in Fig. 4, the transfer clamps 22 to 25 are they are arranged each in its closest position to the contiguous, keeping the pair of first and second clamps of transfer 22 and 23, and the pair of third and fourth clamps of transfer 24 and 25 a positional symmetry relation to of a theoretical Y-Y transverse axis of the box transfer clamps 12.

Under these conditions, once the separation of the containers 3 from the continuous formed sheet 1 by means of cutting means 4, the rotation of the cam 26 gives rise to that, by means of the first-gen lever 28 and connecting rod 31, the transfer clamp box 12 is driven upwards; drive pulleys 14 and 15 are rotated by means of the lever drive 32 of connecting rod 33 and crank 34 in such a direction which prints to the upper branch of the outer drive belt 18 and to the upper branch of the inner drive belt 19 a displacement in the indicated direction B, and to the lower branch of the internal drive belt 19 and to the lower branch of the belt of external transmission 18 a displacement in the indicated direction TO; consequently, the rotation of the driving pulleys 14 and 15 during the lifting of the transfer caliper box 12 produces by means of the transmission belts 18 and 19 the separation of two contiguous transfer clamps, while the position of each pair of transfer clamps keeps symmetry relation to of the Y-Y transverse axis. In Fig. 6 you can see that the transfer clamp box 12 has reached a position upper transfer, occupying the transfer clamps 22 to 25 a position in which the containers 3 are collected by the DL filling device. Once the packages 3 are collected by the filling device DL, the rotation of the cam 26 produces the lowering of the transfer clamp box 12; the turn of the drive pulleys 14 and 15 in the opposite direction to the previous one; the displacements of drive belts 18 and 19 in direction contrary to the previous one; and the positioning of the clamps transfer 22 to 25 detailed in Fig. 4, arranged for holding of another group of packages 3.

In Figs. 7 and 8 it is appreciated that the device of filling DL comprises a frame 43 on which it is arranged an endless conveyor 44, consisting of an ascending section and a parallel descending section facing each other, linked by their respective ends by sections semicircunferential, on which four mechanisms are mounted horizontal clamps 56 of containers 3.

In Fig. 3 it has been represented simplified the DL filling device, being appreciated in the lower end 1 of the ascending section of the endless conveyor 44 the container transfer position 3, from the device from conformation DC to the filling device DL; To the extreme upper II of the ascending section the opening position of containers 3 for filling, said opening being made by means of suction nozzles 48; at the upper end III of the section descending the filling position of the containers 3 with the product to be packaged, by means of dispensers 49; and at the lower end IV of the descending section the closing position of filled containers 3, by means of a welding device 50. The containers 3 once closed are deposited on means of evacuation of containers, consisting of a conveyor belt 51.

The frame 43 comprises two horizontal axes 45 parallel to each other over those that can be in both directions displaced two vertical supports 46, indicated such as E and F in Fig. 8, on which the endless conveyor 44.

The endless conveyor 44 comprises a system of intermittent rotation of 180º 53, provided with a shaft 47 coupled to the lower ends of the vertical supports 46, being provided the axle 47 with two driving sprockets 52 arranged between both supports 46; two driven sprockets 54 arranged at the upper ends of the vertical supports 46, facing each other and coplanarly with respect to drive sprockets 52; and a first and a second transport chains 55 and 58, linking each of them a driving sprocket 52 with its corresponding cogwheel driven 54, being mounted on both transport chains 55 and 58 the four horizontal clamping mechanisms 56, regularly distributed.

In Fig. 8 it can be seen that each mechanism horizontal clamping 56 comprises a first horizontal axis of clamping 57 coupled at one end to the first chain of transport 55, so that it occupies a fixed position with respect to the same, while its other end is coupled to the second transport chain 58 transversely movable with respect to the same; and a second horizontal clamping axis 59 located by above the first horizontal clamping axis 57, coupled by one from its ends to the first transport chain 55 transversely movable with respect to it, while the another end is coupled to the second transport chain 58 of so that it occupies a fixed position with respect to it.

The first horizontal clamping axis 57 is provided with a first group of clamps comprising four clamps 60, arranged so that the distance that separates one of them from another that is contiguous is constant, in so much so that the second horizontal clamping axis 59 is provided with a second group of clamps comprising four clamps clamping 61, arranged such that the distance between one of they of another that is contiguous is constant. Both groups of clamps are arranged with each other so that some clamps 60 of the first group of clamps and the corresponding clamp 61 of the second group of clamps allow the holding of a container 3.

The horizontal clamping mechanisms of containers 56 described above allow to adapt the distance that separates the pairs of clamps 60 and 61 of the packages 3 to the amplitude of this as explained below. He displacement of the vertical supports 46 on the axes horizontal 45 of the frame 43, causes the displacement of the horizontal clamping axes 57 and 59 of each of the mechanisms horizontal clamps 56, being these integral with a respective transport chain 55 and 58. Specifically, the displacement of vertical supports 46, bringing them closer together yes, it causes the mutual withdrawal of the clamps 60 and 61 of each pair of clamps of a container 3, while the displacement of the vertical supports 46 separating them from each other, causes the mutual approach of the clamps 60 and 61 of each pair of clamps for holding a container 3.

Claims (11)

1. Automatic packaging machine, of the type comprising a device for forming (DC) containers (3) of heat-sealable material in the form of bags and a filling device (DL) for packages (3) with the product to packaging, linked by a transfer device (DT) disposed below the filling device (DL) that transfers packages (3) from the forming device (DC) to the filling device (DL), characterized in that the device Transfer (DT) transfers the containers (3) from the forming device (DC) to the filling device (DL) by a vertical displacement and a horizontal displacement of the containers, both movements being performed simultaneously, alternately and coplanarly, and because the device Filling (DL) comprises a frame (43) in which an endless vertical conveyor (44) is arranged that describes a path formed by an ascending section and a descending section pa thinning and facing each other, linked by their corresponding ends by semi-circumferential sections, the endless conveyor provided with one or more securing mechanisms (56) of containers (3) regularly distributed, simultaneously movable and so that each of they successively and sequentially occupies the lower end of the ascending section, or receiving position of containers (3) supplied by the transfer device (DT), the upper end of the ascending section, or opening position of containers (3) for filling , the upper end of the descending section, or filling position of containers (3) with the product to be packaged and the lower end of the descending section, or closing position by welding the containers (3) filled with the product to be packaged, from where they are deposited on evacuation means (51) of full and closed containers (3). 2. Automatic packaging machine according to claim 1, characterized in that the transfer device (DT) comprises a frame (10) provided with two parallel vertical axes (11) facing each other on which a box is movable (12) of transfer clamps, performing an alternative movement driven by a translation mechanism (13). 3. Automatic packaging machine according to claim 2, characterized in that the transfer clamp box (12) comprises a pair of drive pulleys of different diameter (14, 15), coupled in solidarity and coaxially with respect to each other, and a pair of driven pulleys (16, 17) of different diameter, coupled integrally and coaxially with respect to each other, both pairs of pulleys (14, 15; 16, 17) being arranged vertically and coplanarly relative to each other, the pair being of pulleys of larger diameter (14, 16) linked by an outer drive belt (18) and the pair of pulleys of smaller diameter (15, 17) linked by an inner drive belt (19), and the pair of pulleys being motors (14, 15) coupled to a drive mechanism (20) that prints them an alternative rotating movement, in accordance with the alternative movement that the translation mechanism (13) prints to the case (12) of transfer clamps. 4. Automatic packaging machine according to claims 2 and 3, characterized in that the transfer clamp box (12) is provided with two horizontal axes (21) parallel to each other and located between the pair of drive pulleys (14 , 15) and the pair of driven pulleys (16, 17), adapted so that on them they can be displaced in both directions, performing an alternative movement, a plurality of transfer clamps (22, 23, 24, 25), coupled to the branches of the transmission belts (18, 19). 5. Automatic packaging machine according to claims 2 to 4, characterized in that a first transfer clamp (22) is coupled to the upper branch of the outer transmission belt (18); a second transfer clip (23), adjacent to the first (22), is coupled to the upper branch of the inner drive belt (19); a third transfer clip (24), adjacent to the second one (23), is coupled to the lower branch of the inner transmission belt (19); and a fourth transfer clamp (25), adjacent to the third (24), is coupled to the lower branch of the outer transmission belt (18), all adapted so that the alternative rotation of the driving pulleys (14, 15 ) causes the alternative displacement of the transfer clamps (22, 23, 24, 25) on the horizontal axes (21), so that the transfer clamps (22, 23) coupled to the upper branches and the transfer clamps ( 24, 25) coupled to the lower branches have a relationship of positional symmetry with respect to a theoretical main transverse axis (YY) of the horizontal axes (21). 6. Automatic packaging machine according to claim 2, characterized in that the translation mechanism (13) comprises a cam (26) to which the power arm (27) of a lever (28) of the first genre is coupled, whose resistant arm (30) is in turn coupled to the foot of a connecting rod (31), while the head of the connecting rod (31) is attached to the case (12) of transfer clamps, all adapted so that the rotation of the cam (26) causes the reciprocating movement of the lever (28) that the connecting rod (31) transmits to the case (12) of transfer clamps. 7. Automatic packaging machine according to claim 3, characterized in that the drive mechanism (20) comprises a drive arm (32) coupled at one end to the pair of drive pulleys (14, 15) and at the other end to the foot of a connecting rod (33) whose head is in turn coupled to a crank (34) linked to a fixed point (36). 8. Automatic packaging machine according to claim 2, characterized in that the transfer tongs (22, 23, 24, 25) are adapted to occupy two positions, a first position for receiving a container (3) from the device of forming (DC) of containers and a second position of holding the container (3) by a centered longitudinal portion. 9. Automatic packaging machine according to claim 1, characterized in that the frame (43) of the filling device (DL) comprises two parallel horizontal axes (45), to which two movable vertical supports (46) are coupled on the horizontal axes (45) in both directions, causing their mutual approach or distance, the endless conveyor (44) being coupled to the vertical supports (46). 10. Automatic packaging machine according to claim 9, characterized in that the endless conveyor (44) comprises a shaft (47), coupled to the lower ends of the vertical supports (46) and provided with two driving sprockets (52) ), and two driven sprockets (54), arranged at the upper ends of the vertical supports (46), the corresponding pairs of driving sprocket (52) and driven sprocket (54) being linked by a transport chain (55 , 58), and the fastening mechanisms (56) of packages (3) being coupled to the respective transport chains (55, 58). 11. Automatic packaging machine according to claims 9 and 10, characterized in that each clamping mechanism (56) comprises a first horizontal clamping axis (57), coupled at one end to a first transport chain (55), of so that it occupies a fixed position with respect to it, and at the other end to a second transport chain (58), so that it is transversely movable with respect thereto; and a second horizontal clamping axis (59) located above the first horizontal clamping axis (57), coupled at one end to the first transport chain (55), so that it is transversely movable with respect thereto, and by the other end to the second transport chain (58), so that it occupies a fixed position with respect to it, the first horizontal clamping axis (57) being provided with a first group of clamping clamps (60) and the second horizontal clamping axis (59) of a second group of clamps (61), the clamps of both groups being arranged such that a clamp of the first group and a corresponding clamp of the second group allow the holding of a container (3) , and all this being adapted so that the displacement of the vertical supports (46) on the horizontal axes (45) of the frame (43) causes the clamps (60) to approach or move away from a group with respect to the corresponding clamps ( 61) of the otr or group, for the adaptation of the distance that separates them to the dimensions of the container (3).