Check-out counter for supermarkets provided with devices for dispensing bags, opening them and filling them with the sold items

Abstract: Check-out counter for supermarkets and the like, provided with two reels of plastic bags joined in succession, two hoppers for inserting items inside the check-out counter as they are being checked by the cashier-operator, and two collecting stations from where the customer may take the plastic bags filled with items introduced in the check-out counter, which has incorporated inside devices suitable to unwind the two reels, to detach therefrom one at a time the plastic bags and to carry them beneath the two hoppers, to open the bags and support them as long as they are filled with the items introduced through the hoppers, unloading at last the full bags in the two collecting stations.

Description: The present invention relates to check-out counters used in supermarkets and in other points of sale, and more particularly to a check-out counter incorporating devices that dispense on request plastic bags and open them, allowing either the cashier or the customer to introduce therein, as they are being checked, the articles purchased by the customer. It is known that in supermarkets and in other analogous points of sale the items purchased by a certain customer are at present carried by the latter either by hand or by trolley to a check-out counter point where a cashier checks them for payment. To this end the cashier takes one at a time the items chosen by the customer, records the price thereof either by scanner or by hand on a keyboard, and lays them down immediately after on a conveyor belt or a chute wherefrom the customer can in his turn take them after paying the amount resulting from the checkout counter slip. After paying, the customer takes one at a time the purchased items and introduces them in one or more plastic bags that the cashier herself will have put at his disposal or that he himself will have taken from a bag dispensing device located in the supermarket. This operation takes a lot of time and is among the main causes for the long queues of customers often forming at the supermarket counters or the like. In order to obviate such inconvenience, the cashier is usually helped in her work by an assistant who puts the items into the bags as the cashier proceeds to their entry,so that the customer's attention is not distracted during the checking and paying steps of the purchased items, and so that, once these operations are completed, the bags are filled and ready for the customer to take away. The provision for the cashier's assistant, however, besides representing an extra staff cost in the running of the supermarket, does not satisfy the customer because, still as a time-saving measure, the items are introduced in the bags at random, at a considerable risk of breaking, squashing, pollution and so on during the subsequent transport of the bags. In CH-A-500 098 has been already proposed a check-out counter having more than one hopper with a view to increase the rate of processing the purchases. However this known check-out counter incorporates a packaging machine of the kind so called "form, fill and seal". These kind of apparatuses have the inconvenience that they are fed with rolls of plastic film which is then transformed into bags which are then filled and sealed. The manufacture of bags from a roll of flat plastic film requires a quite complicated machine which is therefore easily subject to malfunctions and/or stops. The main object of the present invention is to provide a check-out counter having multiple hoppers, but using preformed plastic bags fed as a continuous bag strip wound on a real. From GB-A-2 055 084 it is already known a check-out counter incorporating an apparatus which uses preformed plastic bags fed as a continuous bag strip wound on a real. However this known apparatus keeps open the bag during its filling by means of a pair of lateral suction jaws with the inconvenience that the lateral suction on the smooth surface of the bag sides is not sufficient for holding the bag when heavy purchases, such as bottles, are inserted therein. Further inconveniences of the above mentioned known apparatus are that it needs further mechanisms for putting the bag in the upright position before its filling, it requires the use of bags having recesses for engaging with a pair of drivers and that it does not allow the use of the most preferred plastic bags which are provided with lateral pleats. It is therefore a specific object of the present invention to provide a check-out counter with multiple hoppers and incorporating an apparatus which uses preformed plastic bags and it is not subject to the above mentioned inconveniences. This object is attained by a check-out counter for supermarkets according to claim 1. Preferred embodiments of this check-out counter are defined in the dependent claims. The features and advantages of the supermarket check-out counter according to the present invention will be clear to those skilled in the art from the following detailed description of an embodiment thereof with reference to the accompanying drawings wherein: Fig. 1 is a perspective view of a check-out counter according to the present invention; Fig. 2 is an elevational view of the bag dispensing, opening and filling devices, housed inside the check-out counter; Fig. 3 shows a view orthogonal to that of Fig. 2; Fig. 4 shows a view from above of the devices shown in Figgs. 2 and 3; Figgs. 5A to 6D show detailed views of the bag opening device during four operative steps; Figgs. 7 to 9 show a perspective view during three operative steps of a variation of the embodiment of the preceding Figures; and Fig. 10 shows a block diagram illustrating how the check-out counter works. Referring now to Fig. 1, one can see that the check-out counter according to the present invention is not, in its outward appearance, very different from the traditional counters. It comprises in fact a plate 1 on which the customer places the articles that he has taken from the various shelves; a scanner 2 that is used by the cashier for the identification and checking of the items; the keyboard 3 by which the cashier performs the same operations on items not provided with bar code; a conveyor belt 7 where the cashier lays the already checked items; a chute 8 from which the customer may take the items he has purchased, as well as a check-out counter register 5 and the guard 6, represented both by a broken line. Unlike the traditional counters, the one according to the present invention has the two bag reels 11 and 11' loccated under plate 1 and hoppers 18 and 18' for introducing the checked items of normal sizes directly in plastic bags dispensed by reels 11, 11', said bags laying open underneath hoppers 18, 18' and being kept open as long as they are being filled; as well as the collecting stations 4 and 4'. The cashier's workplace is recess 9 at the check-out counter central part. Such an arrangement allows the cashier both to have the scanner 2, the keyboard 3 and the check-out counter 5 within reach and to easily take the items from plate 1 and introduce them in hoppers 18 and 18' or lay them down on conveyor belt 7 if they are so bulky as not to pass through the hoppers. Thanks to this structure the cashier, after checking a given item by means of either scanner 2 or keyboard 3, introduces it at once by the same hand in either of the hoppers 18, 18', underneath either of which there is a bag which is fed and kept in an open position by suitable devices that are located inside the counter and will be described in more detail hereinafter. As the bags located under hoppers 18, 18' have been filled, or there are no more items to introduce therein, they are driven sideways as far as into the collecting stations 4 and 4', from where they can be easily taken away by the customer that will have paid in the meantime the purchased items. The stations 4 and 4' are separate from each other, so that the bags containing the items that have been introduced through hopper 18 and have gathered in station 4 would not touch against the bags containing the items that have been introduced through hopper 18' and have gathered in station 4'. It now appears clear how by the check-out counter according to the present invention there are attained all the intended objects, namely that of reducing the rates at which the customers proceed through the check-out counter, as well as that of sorting the items directly at the checking step, and introducing them in distinct bags according to whether they are foodstuff or not, fragile or not etc., so as to prevent the items from getting broken squashed or polluted during the filling of the bags and/or their subsequent transport. In fact by the check-out counter according to the present invention the customer, after paying for the purchased items, need not introduce such items, either directly or indirectly, in the bags for the transport, yet he will find the said items ready inside the bags in the collecting station 4, 4', because the filling of the bags has automatically taken place as far back as during the checking operations effected by the cashier. Moreover, still at the checking steps, the cashier will have sorted the items conveniently by inserting in one hopper, say No. 18, all the foodstuff or fragile good and in the other the stronger goods or the products other than foodstuff. The bags used in the check-out counter according to the present invention are like the traditional ones, and are linked in succession to one another forming a continuous strip that is wound on a reel according to a manner known in the art. In Fig. 1 there are shown reels 11 and 11', each consisting precisely of a plurality of bags linked as a continuous strip wound around a central core 14. The end parts of such central core protrude laterally and rest against the slanted edge 15 of the vertical wall that partly covers the sides of the housing of reels 11, 11'. Upon the cashier's actuation, the devices that are incorporated in the check-out counter, and that are not therefore visible in this Figure, cause the said continuous bag strips to unwind from reels 11, 11' and to pass under platform 10; they detach one single bag from each continuous strip, open it and keep it well open under hopper 18, 18' as long as it is filled just through the said hopper. The filled bags are then discharged by the same devices and put at the customer's disposal in stations 4 and 4'. Both the structure and the working of the devices incorporated in the check-out counter according to the present invention will now be described in detail with reference to the remaining Figures. Referring now to Fig. 2, the bag reel referenced as a whole by No. 11 can be seen on the right. This reel consists of a continuous strip 12 of bags 13 wound about a central core 14. The end parts of this central core protrude laterally from the sides of reel 11 and rest on the slanted edge 15 of a panel that partly covers laterally the housing of reel 11. The latter rests at its lower part on the rubberized roller 16 that makes it unwind when said rubberized roller is rotated by motor reducer 17 by means of chain 19. Motor reducer 17 can work only when microswitch 20 is not depressed by the rocking lever 21. At the upper end of this lever there is roller 22, about which there winds the continuous strip 12 of bags 13 that is shown in the Figure by a broken line. When a bag 13 should be brought to hopper 18 so as to be opened and filled by the cashier, the latter presses on a button that actuates the motor reducer 37 that controls the bag dispensing means. This means drags upwards strip 12 that is thus tensioned, whereby the tension roller 22 is given an upward push that causes the upper end of the rocking lever 21 to lift. The lower end of lever 21 will also lift and thus no more depresses microswitch 20 that actuates motor reducer 17 that in turn actuates the rubberized roller 21 causing reel 11 to unwind. The provision for edge 15 of the reel-covering panel - against which abut the protruding ends of core 14 - being slanted makes reel 11 be always supported by the rubberized roller 16 that controls the unwinding thereof. Strip 12 is then guided around idle rollers 23, 24 that drive it downwards until having it gripped by the two lower driving belt units 25 and 26. Belt unit 25 consists of a plurality of flat belts intended to come in contact with one face of a bag 13. Their number depends of course on the sizes of bag 13 and in the herein illustrated embodiment they are nine, so as to act on the whole face of bag 13. Driving belt unit 25 cooperates with driving belt unit 26, of like number and size, which acts on the opposite face of bag 13. Belt units 25 and 26 rotate about the lower rollers 27, 28 and the driving rollers 32, 33 respectively. Roller 27 is provided with a lever 29 by which it is possible to lift said roller when strip 12 must be inserted between belts 25, 26 when replacing an exhausted reel by a new one. The lifting of roller 27 by means of lever 29 - sketched in broken line in Fig. 2 - takes place by using a first interposed roller 30 as lever fulcrum. A second interposed roller 31 is mounted between the lower rollers 27, 28 and the driving rollers 32, 33 and is for making belts 25, 26 run under one another in close contact at the upward bent of the pathway of strip 12. Belts 25, 26 are actuated by driving rollers 32, 33, roller 32 alone being actually motor-driven, whilst roller 33 is linked to roller 32 by a pair of toothed wheels each of which is keyed onto each one of the rollers. Roller 32 is rotated by motor reducer 37, and the rotation of roller 32, thanks to the said pair of toothed wheels, involves the rotation of roller 33. On roller 32 there is also mounted a pinion 34 which, by means of chain 38, is linked to a corresponding pinion 35 mounted on the superimposed upper roller 39. In this manner the rotatory motion of roller 32 is transferred to the upper roller 39, and from this to the upper roller 40 by means of a pair of toothed wheels analogous to the one linking driving rollers 32 and 33 to each other. Thus motor reducer 37 motor drives both the rollers 32, 33 with their relevant lower belt units 25, 26, and the upper rollers 39, 40 with the two relevant upper belt units 41, 42. Belts 25, 26 of both lower units press upon each other about the second interposed roller 31, gripping therebetween the continuous bag strip 12 which, when the belts are rotated, is accordingly driven upwards in the direction of the superposed bag opening device. The upper belts 41, 42 too, as they rotate facing each other, hold in between the continuous strip 12 coming from the underlying dispensing device and drive it towards the superposed bag opening device. Between the bag dispensing device and the superposed opening device thereof there is interposed the filling device comprising a motor reducer 43 that controls driving pulley 14 which, through cable 45 and idler 46, makes slide 47 - to which the bag filling plate 48 is secured - move up and down. The latter consists of two half-plates separated by a central aperture 49 through which the empty bags can pass in their ascending motion. Each single bag 13 is detached from the continuous strip 12 by reversing the direction of rotation of rollers 32, 33 and of the relevant belts 25, 26, whilst rollers 39, 40 are kept firmly still. This is made possible by two freewheels keyed on roller 39, whose function will be described hereinafter with reference to Fig. 3. The reversing of the rotation of motor reducer 37 and rollers 32, 33 is controlled by elements 51, 51' of a photocell array between which the continuous strip 12 passes. As already said, this strip consists of a continuous succession of bags 13 wherein the bottom of each bag is joined to the upper end of the handles of the subsequent bag. It follows that the continuous strip 12 has a periodical alternation of full and empty spaces, the empty ones consisting of the zones defined by the two handles and the upper edge of each bag. During the upward motion of strip 12, the full zones obscure both elements 51, 51' of the photocell that are lit up again in correspondence of the empty zones of the strip. Therefore, when the lower edge of a bag crosses the photocell line, the elements thereof are lit and cause the inversion of the direction of rotation of motor reducer 37 as well as rollers 32, 33 with the relevant belt units 25, 26. By effect of such inversion, which is made possible by freewheel 36 and 36', belt units 25, 26 drive downwards the continuous strip 12, whilst the foremost bag 13 of such film is held between the two belt pairs 41 and 42 that are stationary owing to freewheel 36' present on roller 39 being locked. This brings about the tearing of the two small strip portions that join the bottom of bag 13 to the upper end of both handles of the subsequent bag of the continuous strip. After bag 13 has been thus detached from the continuous strip 12, the direction of rotation of motor reducer 37 goes back to its original condition before the inversion, whereby rollers 32, 33 with their relevant belts 25, 26 start driving upwards strip 12 again, whilst the single detached bag is driven by the upper belts 41, 42 all the way under hopper 18. When bag 13 has arrived under hopper 18, it is opened by the opening device and takes on the shape illustrated in broken line in Fig. 2. The same Figure shows, still in broken line, the uppermost position reached by the two half-plates of the bag filling plane 48, on which rests the bottom of each bag 13 as it is being filled. Such half-plates are in the said uppermost position at the beginning of the filling step of bag 13, so as to prevent the single items - introduced therein through hopper 18 - from bumping too violently against the bottom of bag 13, because of an excessive drop. A too violent bumping of the items against the bottom of bag 13 may cause them to be deformed or even torn, not to mention the risk of being damaged. After the available room inside bag 13 has been filled with articles, the filling plate 48 lowers until an intermediate position at which bag 13 is subjected to a second filling step. At the end of such second step, the filling plate 48 lowers further down until its lowest position (illustrated too in broken line in Fig. 2), that lies at the same height as ejection plate 53. After the filling plate 48 has passed from its intermediate to its lowest position, no filling of bag 13 takes place, because the difference of height between such positions is just for having the upper level reached by the items inside the bag further lowered accordingly, in order to prevent the items from bumping against the bag opening device during the ejection of the filled bags. The filled bags 13 are shifted sideways by an ejector 54 that drives them towards the outside of the device making them slide along the ejection plate 53. In Fig. 2 ejector 54 is illustrated in unbroken line in its resting position, whilst it is sketched in dotted line in the ejection step of the filled bag 13' , illustrated too in dotted line. The filled bag 13' is accompanied by ejector 54 up to the collecting station 4. The reciprocating horizontal motion of ejector 54 is controlled by a slide 56 (shown in Fig. 2) linked by a cable 57 to the pulley 59 actuated by motor reducer 60. Cable 57, that engages slide 56 with ejector 54 linked thereto in a reciprocating horizontal motion, rotates around idler 58 as well. The filling device of the apparatus according to the present invention comprises as well a photocell array 61, located immediately below the upper edge of hopper 18. These photocells detect the maximum level reached by the items introduced in bag 13 and, should the photocells be still obscured at the end of the filling process, they would prevent the motor reducer 60 - that controls the motion of ejector 54 - from moving. Thus there can be avoided that a bag over-filled with items be subjected to the ejector's action, with the consequent risk of having the bag opening device jammed, and the bags damaged along with their content. Once the excess items have been taken away from the bag, photocells 61 are lit up again and do not block motor reducer 60 any longer, so that ejector 54 can resume its working. The bag opening device comprises a right pliers 63 cooperating with a facing left pliers 62, as well as a pair of tiltable flaps 64, 65 located perpendicular to the pair of pliers 62, 63. As can be seen in the Figure, pliers 62, 63 are immediately below the two opposite sides of hopper 18, whilst, slightly below the other two opposite sides of this hopper, there are located the tiltable flaps 64, 65. These flaps, when the device is stationary, are in the horizontal position and obstruct hopper 18, preventing items from being passed through it when there is no bag 13 ready to receive them. When, on the contrary, bag 13 is ready to receive such items, namely it lays in the position illustrated in broken line in Fig. 2, the two flaps 64, 65 are tilted downwards as shown in Fig. 2, where flap 64 only can be seen, because flap 65 is located at the opposite side of hopper 18. Behind flap 64 are shown in broken line the two idlers 66, 67 of the upper driving belt units 41, 42 respectively. Pliers 62, 63 are actuated by motor reducer 70 through cable 68 and pulleys 69, 71. One pliers is linked to the upper branch of cable 68 and the other to the lower branch thereof so that, under the driving action of cable 68, the pliers can shift from a position of maximum distance, being illustrated in Fig. 2, to a meeting position, laying at the center line of hopper 18. When pliers 62, 63 meet, they grip the top edges of the two opposite faces of a plastic bag 13 which is then opened when pliers 62, 63, by moving away from each other, move as well the opposite bag faces that were firmly gripped by the pliers themselves. Immediately after pliers 62, 63 have been spaced apart from each other, flaps 64, 65 are tilted downwards by effect of the electromagnet 72 action (see Fig. 3). When flaps 64, 65 are wholly tilted downwards, they keep spaced apart the other two opposite faces of bag 13, that is the sides corresponding to the bellows of the bag itself. In such a position bag 13 is therefore completely open in the shape of a rectangle immediately below hopper 18, the two opposite faces being firmly held by pliers 62, 63, and two opposite sides being held by the downwardly tilted flaps 64, 65. The way in which the bag opening device works will be described hereinafter in greater detail, with reference to Figgs. 5A to 6D. Referring now to Fig. 3, which is an elevational view orthogonal to that of Fig. 2, there can be seen on the left (this time frontally) the apparatus described above with reference to Fig. 2. Such an apparatus is that incorporated in the check-out counter according to the present invention, at hopper 18. Close to it there can be seen an entirely analogous apparatus being the one incorporated in the check-out counter at hopper 18'. To make the description clearer, the parts of this second apparatus have been identified by the same reference numbers used for the apparatus on the left, save for putting the figure 1 before the said numbers. For instance, bag 13 has become 113, ejector 54 has become ejector 154, and so on. On top left side of Fig. 3 one can see pliers 63 holding the top portion of bag 13 in open position. The opposite pliers 62 is not of course visible in this figure, unlike flaps 64, 65, which are shown in profile in tilted position. The tilting of flaps 64, 65 is actuated by electromagnet 72 by means of the rocking lever 73, one end of which is hingedly fixed to hub 74 of blade 64, and the other is hingedly fixed to hub 75 of the tiltable flap 65. The rocking lever 73 is linked to electromagnet 72 by means of arm 76. The end part of lever 73 in proximity to electromagnet 72 has an extension 77 that, when lever 73 lowers under the action of a return spring (not shown) presses on the security sensor 78. By effect of the excitation of electromagnet 72, arm 76 is pushed upwardly causing the rotation of the rocking lever 73, whose ends make hubs 75, 74 rotate clockwise and anti-clockwise, respectively. The rotation of the two hubs involves the tilting downwards of flaps 65, 64, secured to both the said hubs. The working of this mechanism will be described hereunder in greater detail, with reference to other Figures. On the left side of Fig. 3 there can be seen the upper half of bag 13 that rests on plate 48, and is ready to be filled through hopper 18. The lower end of bag 13, on the contrary, hangs floppy down, passing through the aperture 49 that separates the two half- plates of the filling plate 48 and that is provided for the bag to pass through in its ascending motion towards the superposed opening device. On the lower left side of Fig. 3 one can see the motor reducer 43 actuating pulley 44 that rotates the driving cable 45 of slide 47 that carries the loading plate 48. Farther up there is shown motor reducer 37 that motor drives roller 32 and, by means of this, roller 33 (not visible in this Figure) by means of the toothed wheel 79 that is in mesh with the analogous toothed wheel 79' keyed on roller 33. The driving roller 32 is provided with pinion 34 which is linked through chain 38 to pinion 35 mounted on the upper roller 39. Chain 38 with pinions 34, 35 causes the rotary motion of roller 32 to be transferred to roller 39. The rotation of roller 39 brings about the rotation of the two upper belts 41 located at its end part which, as they rotate facing the two belts 42 (not visible in this Figure), drag upwardly the bag 13 placed therebetween. Roller 39 is provided with the toothed wheel 80 that is in mesh with an analogous toothed wheel keyed onto roller 40 (not visible in this Figure). In Fig. 3 is also shown on roller 39 the pinion 35 which is provided with the freewheel 36 that allows roller 39 to rotate clockwise only, i.e. according to the upwardly drag of the strip 12 under the action of chain 38. When chain 38 reverses its rotation by effect of the inversion of rotation of motor reducer 37, the freewheel 36 runs idle and roller 39 is not actuated any longer, with consequent stopping of the belt units 41, 42 that drag strip 12 upwardly. As strip 12 is also gripped between the underlying belts 25, 26 actuated by roller 32, when this roller reverses its direction of rotation strip 12 could transmit the anti-clockwise motion to roller 39 through belts 41, 42 which are at that moment at a standstill because the freewheel 36 idles. This would be an inconvenience because the reverse of the direction of rotation of motor reducer 37, of rollers 32, 33 and of the two relevant lower belt units 25, 26 is a provision intended for detaching one single bag 13 from the continuous strip 12 (as was described in detail with reference to Fig. 2) and must take place as the upper belts 41, 42 are absolutely stationary. In order to obviate such inconvenience, onto roller 39 is keyed a second freewheel 36' which runs idle when roller 39 rotates anti-clockwise, thus upholding the upward motion of strip 12, but is locked anti-clockwise. Thus freewheel 36' prevents roller 39 from being rotated anti-clockwise by strip 12 when the latter is dragged downwardly because of the inversion of rotation of motor reducer 37. In the free room between rollers 32 and 39 there are interposed the six small round belts 81 that rotate around rollers 32 and 39. Such small round belts are for properly guiding strip 12 in its transition motion from the point wherein it has been left by the lower belt unit 25, 26 to the point wherein it is gripped by the upper belt unit 41, 42. As can be seen in Fig. 3, the two more external of the lower belts 25 are set side by side so as to be twice as wide than the other five belts comprised between them. By virtue of this arrangement a better dragging of the lateral parts of strip 12, corresponding to the handles of each single bag 13, is obtained. The width of the said outer belts arranged side by side is just almost the same as that of the flattened handles of bag 13. On the lower right side of Fig. 3 is shown lever 29 by means of which it is possible to lift roller 27 and rotate it about the interposed roller 30 to insert between the two lower belt units 26, 27 the starting end of strip 12, coming from a new reel. On upper part of Fig. 3 is shown ejector 54 with its arm 56 as well as the underlying idler 46 of the cable which controls the up and down motion of slide 47, that carries the filling plate 48 of the bags. On the right part of Fig. 3, as said hereinabove, it is shown the second apparatus (namely the one mounted under hopper 18') which is completely identical to the one up to now hereinabove described; it is however in a different working step because of the co-ordinated operation of the whole check-out counter. In this apparatus bag 113 has already been filled, and the bottom thereof rests on the filling plate 148 that is in its lowermost position. Ejector 154 has started its stroke (perpendicular to the drawing plane), to eject the filled bag 113 by driving it into the collecting station 4'. On the top part of Fig. 3 there is shown electromagnet 72 which is linked by means of arm 76 to the rocking lever 73, the end of which are hingedly joined to hubs 74, 75, which carry the tiltable flaps 64, 65, respectively. For the sake of clearness in the drawing, Fig. 4 does not show the connection between rocking lever 73 and hub 75, but only the link between rocking lever 73 and hub 74. Such a link is effected by interposing therebetween a small lever 84, with one end pivoted to the end of rocking lever 73 and the other end secured to hub 74. An analogous small lever (not shown) performs the analogous link between the other end of lever 73 and hub 75 that carries flap 65. The way in which this mechanism works will be better illustrated hereinafter with reference to Figgs. 5A to 6D. Referring now to Fig.4, the two above mentioned apparatus are seen side by side in a top plan view. Of the apparatus on the left one can see the motor reducer 70 that, by means of pulleys 69 and 71, rotates cable 68 to which are secured bracket 82, carrying pliers 62, and bracket 83, carrying pliers 63. Perpendicular to the two pliers there are arranged the tiltable flaps 64, 65 which in this apparatus are in the horizontal position, so as to prevent items inadvertently introduced through hopper 18 from entering bag 13. In the apparatus on the right the tiltable flaps 164 and 165 are on the contrary in tilted position, whilst bag 13 is entirely open, so that it can be filled. In the area beneath flaps 64 and 65 it is possible to see the two half plates of the filling plate 48 separated by split 49, through which runs bag 13, indicated by a broken line, as it is being brought upwardly by the upper belt units 41, 42. In Fig. 4 it is shown the top part 93 of pliers 62, which is provided, on its lower face, with a plurality of spaced apart rubberized blocks 97. Underneath part 93 there is the other component 94 of pliers 62. Such component (not visible in this Figure) has a series of recesses having dimensions and sizes almost identical to those of the rubberized blocks, and being spaced apart from one another exactly as said blocks are. Likewise, pliers 63 comprises too two components 95, 96 identical to those of pliers 62, but mounted the other way round. In Figure 4 one can in fact see the top part 96 covering the underlying part 95. The latter has on its upper face, namely the one facing component 96, a series of rubberized blocks 98 which can pass through the corresponding recesses of part 96 that is visible in the Figure. As the device is working, pliers 62 and 63 advance until they meet and partly interpenetrate, holding bag 13 therebetween, the pliers structure being such that the rubberized blocks 98 of pliers 63 catch on two opposite faces of bag 13. As a matter of fact, as the two pliers 62 and 63, as well as their components 93, 94, 95, 96 are brought in mutual contact, the rubberized blocks 97 located on the lower surface of component 93 pass through the corresponding recesses of component 96 until they abut against component 94, while the rubberized blocks 98 of pliers 63 abut against component 96 after they have passed through the recesses of component 94 of pliers 62. In Fig. 5A to Fig. 6D is illustrated the working of the bag opening device shown during four different operative steps. In Figgs. 5A to 6D the device is shown by an elevational view corresponding to the one of Fig. 2, whilst in Figgs. 6A to 6D the device is shown in an elevational view corresponding to that of Fig. 3. In Fig. 5A both pliers 62 and 63 are in the open position and have just started their mutual approaching motion under the action of motor reducer 70 through cable 68 as illustrated by the two small arrows under said Figure. Of pliers 62 is visible the top part 93 carrying below the rubberized blocks 97 that are intended to grant part 93 a better grip on the face of bag 13 when pliers 62 closes with bag 13 held between parts 93, 94 of the pliers itself. Part 93 of pliers 62 is pushed towards the underlying part 94 by spring 99. Likewise, spring 100 pushes against each other the parts 95, 96 of pliers 63 which, as already said above, has a totally identical structure as that of pliers 62, with the exception that it is mounted the other way round and offset with regard to it, so that the rubberized blocks of each pliers are in register with the corresponding recesses of the other pliers. In Fig. 5A both pliers are in the open position. The opening of pliers 62 is due to the fact that the top part 93 has been pushed upwardly upon lowering of the small lever 102, overcoming the resistance of spring 99. The lowering of the small lever 102, which has its fulcrum at 103 on lever 104, has been caused in turn by pin 105 that protrudes from the upper part of lever 104 and that has been brought downwardly by the slanted plane of the groove 106 along a polyamidic material parallelepiped 107 within which slides the said pin 105. As it can be seen, groove 106 begins with a chute that is just for driving downwards pin 105, which remains lowered during the whole of its stroke along groove 106, that ends at the other extremity with a vertical upward-directed leg through which pin 105 can go up again under the pushing of spring 99. Likewise, in pliers 63 the lower part 95 is pushed downwards by pin 108 that runs along the groove 109 of the parallelepiped 110 of polyamidic material. In this case groove 109 has no upward-directed leg, because parallepiped 110 is shorter than the facing parallelepiped 107. Therefore pin 108 can come out of groove 109, when the latter ends, under the pushing of spring 100. In Fig. 5B is illustrated the step when the two pliers 62, 63 meet each other and partially interpenetrate both horizontally and vertically, while bag 13 is interposed therebetween. In this position bag 13 is firmly held between parts 94, 97 on one side, and parts 96, 98 on the other side. Pin 105 has arrived in correspondence of the vertical leg of groove 106, so that it can rise, causing the lifting of lever 102 as well as the releasing of spring 100 which pushes against each other parts 93 and 94 of pliers 62, whilst a portion of bag 13 is interposed between them. Likewise, pin 108, having by this time arrived at the end of groove 109, will be free to rise pushing parts 96 and 95 of pliers 63 against each other in order to grip therebetween too another portion of bag 13. When both pliers are closed, bag 13 has three adjacent zigzag-folded portions comprised between them. The upper portion is comprised between the rubberized blocks 97 of part 93 of pliers 62 and the upper surface of part 96 of pliers 63; the intermediate portion is comprised between the lower surface of part 96 and the upper surface of part 94; the lower portion is comprised between the rubberized blocks 98 of part 95 of pliers 63 and the lower surface of part 94 of pliers 62. Thanks to this arrangement, when pliers 62, 63 begin to move mutually apart, they become gradually disengaged, because blocks 97 of pliers 62 slide among the recesses of part 96 of pliers 63 and blocks 98 of pliers 63 slide among the recesses of part 94 of pliers 62. The upper and lower portions of bag 13 which are in contact with the rubberized blocks 97, 98 are dragged by the latter. Since each portion consists of two superposed plastic sheets (i.e. the ones forming the two faces of bag 13), it happens that the outer surface of each sheet, being in contact with the rubberized blocks 97 or 98, is firmly held by these, whilst the inner surface of each sheet is free to slide on the inner surface of the other sheet thanks to the low friction coefficient of the strip of which the bag is made. By effect of these differences in friction, the two pliers 62, 63, when they move away from each other, carry with them the two opposite faces of bag 13 which is thus opened. In Fig. 5C there can in fact be seen pliers 62, 63 during their mutual moving apart, illustrated in the Figure by two small arrows. Bag 13 is gradually opened by the mutual moving apart of pliers 62, 63 which are both closed by action of springs 99 and 100, respectively. During its outward return stroke pin 105 slides inside groove 106 still, but lever 104 is by that time in inclined position under the action of coil spring 111 (see Fig. 4) that resiliently and hingedly joins the small lever 102 to the small lever 104. In this position extension 112 of the small lever 104 does not rest against the lock pin 101 of the small lever 102 any longer. An analogous situation has risen as far as the corresponding parts forming pliers 63 are concerned. In Fig. 5D there can be seen both pliers 62, 63 having by this time reached their maximum spaced apart positions, the two faces of bag 13 being mutually spaced apart to the utmost. Pin 105, having arrived at the highest part of the mouth of groove 106, has wholly disengaged from this, allowing thus spring 111 to restore lever 104 to its vertical position. Thus its extension 112 is in abutment again against the lock pin 101 of the small lever 102. In this position, when pin 105 is driven again into groove 106 as a consequence of the mutual approaching motion of pliers 62, 63, it will cause the lowering of small lever 102 and the lifting of part 93 of pliers 62, which will thus be opened. By effect of this opening, bag 13 will be disengaged from pliers 62, and likewise from pliers 63. This will occur when, as will be further described hereafter, bag 13 has been filled with items up to the allowed top limit. In FiG. 5D is shown also flap 64 that has been tilted downwards, thereby causing the outward shift of one of the sides of bag 13 comprised within the two faces held by pliers 62, 63. Flap 64, besides pushing said side outwards, flattens as well the side bellows of bag 13 with its relevant handle. Flap 65, which is located at the opposite side (not visible in this Figure) performs, by tilting downwards, the same operation. Thus the opening device with both spaced apart pliers 62, 63 and the tilted flaps 64, 65 will keep bag 13 completely open, giving its mouth a substantially rectangular shape, corresponding to the shape of hopper 18 under which the bag is kept open. This permits a smooth introduction in bag 13 of the items purchased at the supermarket's. In Figgs. 6A to 6D the tilting movement of flaps 64, 65 is best visible in succession. In Fig. 6A there can be seen flaps 64, 65 in their horizontal position, corresponding to that of Fig. 4. In such position flaps 64, 65 carry out their other function, namely that of avoiding the accidental introduction of either hands or objects inside bag 13. In Fig. 6A is shown in broken lines the rocking lever 73, which is not actually in that position (i.e. close to pliers 63, of which parts 95, 96 are shown), but (as shown in Fig. 4) in the proximity to pliers 62. This phantom representation is just for better illustrating how the device works. The rocking lever 73 may oscillate about fulcrum 114, and is pivoted at 115 to arm 76 of electromagnet 72. When electromagnet 72 is not excited, arm 76 (being urged by a not shown spring) shifts downwardly, causing pin 115 to lower down and thus causing as well the lowering of the arm of lever 73 to the left of fulcrum 114. This involves the downwards rotation of lever 85, which has one end pivotally joined to the left end part of lever 73, and the other end secured to hub 75 of flap 65. The downwards rotation of lever 85 causes the anti-clockwise rotation of hub 75 which brings flap 65 in horizontal position, as illustrated in Fig. 6A. Concurrently with the lowering of the left arm of lever 73 about fulcrum 114, there occurs the rising of the right arm of lever 73. Such rising involves the upwardly rotation of lever 84, which has one end pivotally joined to the right end part of lever 73 and the other end secured to hub 74 of flap 64. The upwardly rotation of lever 84 causes the clockwise rotation of hub 74, which carries flap 64 in the horizontal position illustrated in Fig. 6A. As can be seen in Figgs. 6B and 6C, during the interpenetration and subsequent moving apart of pliers 62, 63, the tiltable flaps 64, 65 remain in their horizontal position, whereby extension 77 (shown in Fig. 3) of lever 73 presses against safety sensor 78, so that the accidental pressing of either flap makes the machine stop at once. By effect of the excitation of electromagnet 72, arm 76 shifts upwardly again, lifting pin 115 and making lever 73 rotate about fulcrum 114. Owing to this rotation, the left end part of lever 73 rises, raising also the end of lever 85 which is pivotally joined thereto. By effect of such rising motion, the other end part of lever 85, joined to hub 75, makes the latter clockwise rotate, and flap 65 downwardly tilt (see Fig. 6D). The upwards rising of arm 76 also involves the lowering of the right end part of lever 73, namely the part on which there is pivoted an end of lever 84. By effect of such lowering, the opposite end of lever 84 makes hub 74 anti-clockwise rotate, and flap 64, secured thereto, downwardly tilt. As already said above, the downwardly tilting of flaps 64, 65 allows the items to have easy access to bag 13 through hopper 18, and helps keeping the handles and the upper part of the bellows of bag 13 spaced apart and covered. Referring now to Figgs. 7 to 9, a preferred variation of the above described embodiment will be described. Such variation relates to a safety device consisting of a small gate 90 suitable to close the room above ejection plate 53 so as to leave it always free for the passage of ejector 54 and of the filled bag driven by the said ejector. Such gate prevents a filled bag - already ejected from ejector 54 - from backward tilting on the ejection plate 53, obstructing thus the passage of the subsequent filled bag. The gate is formed by two doors each consisting of a plurality of parallel horizontal comb-like pickets arranged along a post 91, 91' that acts as door hinge. Ejector 54 too consists of a plurality of parallel horizontal spaced apart pickets exactly like those of which gate 90 consists. These pickets are mounted the one on top of the other along a vertical pin 92 occupying a room slightly inferior to the gap left between the two doors when they are side by side in closed position. Ejector 54 is mounted in such a way with respect to gate 90 that the pickets that make it up be at the same level as the gaps among the pickets making up the gate doors. By this arrangement, when the ejector in its reciprocating movement meets gate 90 in closed position, it is free to pass across it because pin 92 passes in the gap between the two gate doors and the pickets of ejector 54 pass among the pickets of the two doors. In Fig. 7 is shown ejector 54 as it pushes bag 13 - represented in broken lines as it is passing through the two doors of gate 90 opened by the bag itself - along plate 53. In Fig. 8 is shown ejector 54 as, while continually pushing bag 13, it has gone past gate 90, the doors of which have closed again by effect of two return springs (not shown for clarity of drawing) that act upon hinges 91, 91' of said doors. Fig. 9 shows a subsequent operative step in which ejector 54 is coming back to its starting point after having freely crossed gate 90 in closed position. As it can be seen in the Figure, bag 13 cannot tilt backwards on plate 53 because it is hindered by gate 90, the doors of which can be opened only in the ejection direction of bag 13. The return springs keep gate 90 always in closed position, so as to prevent the customers from accidentally introducing their hands on the inside of the device during working thereof. Another particularly advantageous change to the embodiment hereinabove described and illustrated in the annexed drawings refers to the shape of stations 4 and 4'. According to this change, both the partition wall separating the two stations and the side wall of station 4' are outwardly inclined. By this arrangement bags 13 and 113 that are ejected by ejectors 54 and 154, respectively, slide on the ejection plates 53 and 153 in inclined position, namely leaning with one side on the said inclined walls. This prevents bag 13, 113 from tilting and spilling its content; in fact, thanks to the mentioned arrangements, bags are more steady, in that they do not only rest by their bottom on plates 53, 153 but also by one of their sides either on the inclined partition wall or on the inclined wall. Before the beginning of a working shift both apparatus are stationary and flaps 64, 65 and 164, 165 are in horizontal position and obstruct hoppers 18, 18' respectively. When the cashier starts her shift, she turns on the main check-out counter switch, thus actuating a microprocessor that co-ordinates the working of the two apparatus incorporated within the check-out counter and that, at this stage, controls their re-synchronization. By effect of such re-synchronization, reels 11 and 11' are unwound and two bags 13 and 113 are driven upwardly first by belt units 25, 26 and 125, 126, and then by the small round belts 81, 181. As the bottom of bags 13, 113 has gone past the photoelectric cells array 51, 51' and 151, 151', these are no longer obscured by the bags and thus cause the inversion of rotation of motor reducer 37 and of rollers 32, 33, and 132, 133, as well as of belt units 25, 26 and 125, 126. The movement of the upper belt units 41, 42 and 141, 142 is correspondingly stopped so that a single bag 13, 113 is detached from the continuous strips 2, 2'. The subsequent inversion of rotation of motor reducer 37 causes again the movement of the belt units 41, 42, 141, 142 which lift the bag 13, 113 beneath the mouth of hoppers 18, 18'. At this stage, the two pairs of pliers 62, 63 or 162, 163 move towards the center line of hoppers 18 or 18', catch the two opposite faces of bag 13 or 113 and, upon coming back to their original position under the action of motor reducers 70 or 170, they open bag 13 or 113. Contemporarily, the pair of flaps 64, 65 or 164, 165 is downwardly tilted, making the access to bag 13 or 113 free, and holding the sides thereof during the filling steps. At the same time, the filling plate 48 or 148, under the action of motor reducers 43 or 143, has arrived at its highest position and supports bag 13 or 113 during its first filling step. In this first step bag 13 or 113 does not rest on the half-plates of the filling plate 48 or 148 by its bottom, but by an area located slightly above the middle of the bag itself. In fact, in this step approximately the lower half of the bag (and therefore its bottom too) hangs loose downwardly through the aperture 49 or 149 that separates the half-plates of the filling plates 48, 48' or 148, 148'. The cashier can introduce the items inside the upper half of bag 13 or 113 until the level of the items reaches the photocell array 61 or 161. At this point the cashier, if some items are yet to be checked, presses on the starting pushbutton of one or both devices, re-operating thus actuators 43 and/or 143, which lower the filling plates 48 and/or 148 down until bringing them immediately below the bottom of bags 13 and/or 113, that are thus supported over the whole time necessary to fill the bags themselves. The cashier can then insert other items inside bags 13 and/or 113 through hoppers 18 and/or 18' until either there remain no more items to be packed or the uppermost level reached by such items in the bags has obscured photocell array 61 and/or 161. The cashier presses then once again on one or both starting pushbuttons and makes the filling plates 48 and/or 148 further lower by a distance equal to the overall vertical dimensions of the opening devices. By effect of such further lowering the uppermost level of the items in bag 13 or 113 is brought below the opening devices. Bag 13 or 113 can thus be laterally ejected without any hindrances at all after being released by the pliers actuated by the motor reducers 70 or 170. However, in the event that, before this latest lowering of the bag, some items obscure the photocell arrays 61, 161, these will block motor reducers 43, 143, as well as motor reducers 60, 70 or 160, 170, preventing thus the filling plates 48, 148 as well as the pliers and the ejectors 54 or 154 from moving. The cashier should then take the excess items out of the bag, re-press on the proper pushbutton and wait, if the photocell arrays are no longer obscured, for motor reducer 43, 143 to bring the filling plate 48, 148 at the level of ejection plate 53, 153, and for motor reducer 60 or 160 to actuate ejector 54 or 154; the latter will drive the filled bag (released by that time by the pliers) along the ejection plate 53 or 153 until reaching the collecting station 4 or 4', wherefrom the customer may take hold of the filled bag by the handles and take it away. If the customer wishes other items to be checked, the cashier will press once again on the starting pushbuttons of both devices, starting thus a new operating cycle thereof. The working of the bag dispensing devices, of the bag opening devices and of the filling devices is co-ordinated in a known manner by a microprocessor. By this reason no further detailed descriptions are necessary. On the contrary, in order to co-ordinate the working of the two apparatus incorporated within the check-out counter, a special program is required to satisfy both the customers' and the cashier's exigencies. It is in fact important that, while the check-out counter is operative, either hopper 18 or 18' be not contemporarily in the closed position. This may be achieved by co-ordinating the operation of the check-out counter in such a way that one hopper can close only when the other is open, and items can be inserted therein as they are being checked. It is also important that the hoppers be both open at least during one half of an operative cycle. Finally, it is important that the working of the two apparatus be made independent, if need be, so that the cashier may use at least one hopper when the other is blocked because the underlying device is unserviceable owing to the relevant reel 11, 11' being replaced, or by any other motive. The co-ordination of the working of the two apparatus incorporated within the check-out counter according to the present invention will now be described with reference to the block diagram shown in Fig. 10. In this diagram the term "START" indicates the moment when the check-out counter becomes operative at the beginning of the working hours when both the first and the second apparatus incorporated therein start. Upon this starting, the check-out counter is automatically synchronized at 201, whereby both hoppers 18, 18' are open, and bags 13, 113 are maintained open immediately below them, respectively, and are ready to receive the goods purchased by a given customer as they are checked by the cashier who is in charge of that check-out counter. Then the loading step 202 takes place, during which the cashier introduces the items in both bags 13, 113 and sorts them in accordance with their nature: for example, foodstuffs are inserted into bag 13 and items other than foodstuffs into bag 113. When the cashier notices that e.g. bag 13 has already been filled with items (step 203), she presses on the pushbutton of the first apparatus, passing thus through step 204 into step 205, in which the loading plate 48 of the first apparatus is lowered up to its intermediate position (shown in Fig. 3, on the left). Hopper 18 is thus restored to its original position, whereby the cashier may continue performing the loading step 202. Such loading will go on until when the cashier notices that the goods in bag 13 have reached the top level, whereupon she will press on the pushbutton once again, arriving thus at step 206. At this stage the first apparatus lowers the loading plate up to its lowermost level and, if the photocell array 61 is obscured, the cashier is informed by a proper optical and/or acoustic signal that she should remove the excess items from bag 13. This takes place at step 207 and, after the cashier has removed the excess items, she proceeds to step 208 wherein the co-ordination between the first and the second apparatus is adjusted. At the end of step 207, in fact, the second apparatus may have hopper 18 ' either open or closed. If hopper 18 ' is open begins step 209 during which it is possible to continue introducing items therein, while the first apparatus provides for ejecting the full bag (step 210), for detaching a new bag 13 from the continuous strip 12 carrying it before hopper 18 (step 211) and for opening this bag under hopper 18 (step 212). It is thus restored the optimum condition of step 202, during which it is possible to introduce items in both bags, because bag 113 is not yet full (see step 209) and bag 13 has just been opened. However, if hopper 18' is closed, at the end of step 208, the microprocessor which controls the whole co-ordination system of the two apparatus stores condition 213, namely the fact that the cashier has pressed for the second time on the starting pushbutton (step 206) and found photocells 61 free, but hopper 18' closed. Consequently, whilst the first apparatus has ejected bag 13 after it was filled, and has fed and opened a fresh bag under hopper 18, hopper 18' remains closed: the condition whereby one hopper at least must result open during the check-out counter operation is thus complied with. When the cashier sees through hopper 18 ' that also the items that are held in bag 113 have reached the level of barrier 161, she presses for the first time on the starting pushbutton of the second apparatus, passing thus through step 214 to step 215, over which the second apparatus lowers the filling plate 148 bringing thus the check-out counter back to the optimum condition of step 202, namely with possibility of inserting the items in both bags 13 and 113. As the items in bag 113 have almost reached the level of the photocell array 161, the cashier presses on the starting pushbutton of the second apparatus for the second time, passing thus to step 216. If the photocells of array 161 are still obscured, a signal is sent off to the cashier, requesting her to take the excess items off bag 113, similarly to what had happened in step 207 with regard to bag 13. Once the excess items have been taken out of bag 113, step 218 is entered and then, if hopper 18 is closed, also step 223 wherein the microprocessor stores that the said pushbutton has been pressed for the second time, similarly to what performed in step 213 with regard to the first apparatus. If, on the contrary, hopper 18 is still open, the cashier can continue introducing items therein (step 219), whilst the second apparatus provides for ejecting the filled bag 113 (step 221), for detaching and feeding a second bag 113 and for opening it, keeping it open under hopper 18 ' (step 222). In this way, it is restored once again the optimum condition of step 202 during which both hoppers 18, 18' are open and ready for the items to be inserted in the relevant bags 13, 113. As it appears from the preceding description, with the co-ordinated working of the two apparatus it is always restored the optimum step 202 during which both hoppers 18,18' are open to the cashier's disposal. This exactly meets an above mentioned requirement, i.e. that both hoppers 18, 18' be simultaneously open for at least one half of the time necessary for each operating cycle. Further, such co-ordination insures that during an operating cycle both hoppers 18, 18' be never contemporarily closed, preventing thus the cashier from introducing items in bag 13 or 113 and compelling her to break off the checking of the items purchased by the customer standing at the check-out counter. Other additions and/or changes may be made by those skilled in the art to the embodiments hereinabove described and illustrated in the accompanying drawings, remaining within the scope of the present invention according to claim 1; such embodiments were in fact reported by mere way of example and not as a limitation of the invention itself.

Claims: Check-out counter for supermarkets provided with two hoppers (18, 18') and incorporating two apparatuses dispensing and opening plastic bags having lateral pleats from a continuous strip (12, 12') formed by said bags which are joined to one another in top-to bottom configuration and wound on a real (11, 11'), wherein each apparatus comprises a dispensing device for unwinding the strip (12 or 12'), detaching therefrom a single bag (13 or 113) and driving it under a hopper, as well as an opening device provided with mechanical pliers (62, 63, 162, 163) for firmly grasping, the opposite sides of the bag (13, 113), opening it by pulling them apart, and keeping it firmly open under the hopper during its filling. Check-out counter according to claim 1, characterized in that the dispensing device of each of the two apparatuses incorporated within the check-out counter comprises a rubberized roller (16, 116) actuated by a motor reducer (17, 117) for unwinding the continuous strip (12, 12') of bags, two facing lower belt units (25, 26 and 125, 126) for gripping between them the strip (12, 12') of bags as it is unwound from the reel (11, 11') and for driving it towards two superposed facing pairs of upper belts (41, 42 and 141, 142), for detaching a single bag (13,113) from the strip (12, 12') and for driving it towards the opening device. Check-out counter according to claim 1, characterized in that in each apparatus incorporated within the check-out counter the mechanical pliers (62, 63 and 162, 163) of the opening device are horizontally movable under the action of a motor reducer (70, 170) for firmly grasping and pulling apart the two opposite sides of the bag (13, 113) which are kept apart by two tiltable flaps (64, 65 and 164, 165) actuated by an electromagnet (72, 172) by means of a rocking lever (73, 173) said opening device being located immediately below the respective hopper (18, 18') through which the purchases are introduced into the bag (13,113). Check-out counter according to claim 1, characterized in that at least one of the two therein incorporated apparatuses further comprises a filling device consisting in a vertically movable plate (48 or 148) for supporting the bag (13, 113) during the filling thereof and an horizontally movable ejector (54, 154) for ejecting the full bag from the apparatus. Check-out counter according to claim 2, characterized in that in each of the therein incorporated apparatuses the lower belt units (25, 26, 125, 126) of the bag dispensing device rotate about a pair of drive rollers (33, 34, 133, 134) and a pair of lower rollers (27, 28, 127, 128), one roller of the lower pair (27, 127) being movable from the other roller (28, 128) by means of a lever (29, 129) having fulcrum on an interposed roller (30, 130). Check-out counter according to claim 2, characterized in that in each of the two therein incorporated apparatuses the two upper belt pairs 41, 42, 141, 142) rotate around a pair of upper rollers (39, 40, 139, 140) and a superposed pair of idle rollers (66, 67, 166, 167). Check-out counter according to claim 5, characterized in that the pairs of drive rollers (33, 34, 133, 134) are actuated by motor reducers (37, 137) and are linked to the upper roller pairs (39, 40, 139, 140) by means of a chain (38, 138), that engages two pinions (26, 26', 126, 126') mounted on one roller (32, 39, 132, 139) of each pair, respectively. Check-out counter according to claim 5, characterized in that between the lower roller pair (27, 28, 127, 128) and the drive roller pair (33, 34, 133, 134) there is mounted another interposed roller (31, 131) around which the belts of the two lower units (25, 26, 125, 126) rotate, facing one another. Check-out counter according to claim 5, characterized in that it comprises a photocell array (51, 51', 151, 151' ) for detecting the passage of the bottom of one bag (13, 113) and causing the reverse rotation of the driving rollers (33, 34, 133, 134). Check-out counter according to claim 4, characterized in that the filling plate (48, 148) consists of two half-plates separated by an aperture (49, 149) intended for letting the bag (13,113) freely pass therethrough in its ascending motion. Check-out counter according to claim 4, characterized in that the ejector (54,154) consists of a plurality of parallel horizontal pickets secured to a central pin (92, 192), and in that at the extremity of the ejection plate (53, 153) there is mounted a small gate (90, 190) formed by two small doors consisting of parallel horizontal pickets comb-like arranged on -posts (91, 91', 191, 191') and openable only in the direction of ejection of the full bags. Check-out counter according to claim 3, characterized in that each one of the mechanical pliers (62, 63, 162, 163) consists of a component (93, 95, 193, 195) having a surface provided with rubberized blocks (97, 98, 197, 198) and of another component (94, 96, 194, 196) provided with a plurality of recesses intended for letting said rubberized blocks freely pass, the components of each of the pliers being pushed against one another by a spring (99, 100, 199, 200). Check-out counter according to claim 3, characterized in that the electromagnet (72, 172) is linked to the tiltable flaps (64, 65, 164, 165) by means of a rocking lever (73, 173) having one end linked by a small lever (85, 185) to the hub (75, 175) of one flap (65, 165) and the other end linked by a small lever (84, 184) to the hub (74, 174) of the other flap (64, 164). Apparatus according to claim 4 characterized in that the ejector (54, 154) is actuated by motor reducers (43, 143) which are controlled by photocell arrays (61, 161) located below the respective hoppers (18, 18') and stopped when the photocells are obscured.

Inventors: CAPPI ANGELO, RIMONDI RENATO, CAPPI, ANGELO, RIMONDI, RENATO
Applicants: AWAX PROGETTAZIONE, A.W.A.X. PROGETTAZIONE E RICERCA S.R.L.
Application year: 1990
Main classification: B65B43
IPC codes: B65B43, B65B67, G07G1, A47F9