EP0731427A2 - Method for recognizing objects such as coins - Google Patents

Abstract

In the device coins corresponding to a payment, thrown into a hopper, fall on a recessed disc and each lodge in one of the recesses. If two coins are superposed in one recess, the upper coin is deflected outwardly by a slot and then raised by the inclined bottom of this slot to finally be ejected from the recess. The coins are then, as a function of the result of a detection, oriented toward one of the other of two compartments of an annular display which surrounds the separation disc. At the end of each payment the annular display turns a fraction of a turn to bring the two compartments into a presentation position, while two empty compartments are presented to receive the following payment, and the coins corresponding to the preceding payment arrive at a transmission position for example towards collection boxes. The drive of the movable portion of the display is effected by its radially outer edge. The central portion comprising the separator disc and its drive motor can swing downwardly to eject foreign bodies. In case of a questioned coin, or if the movable portion of the display is in the course of rotation, the coin is returned to the detector instead of proceeding to the display.

Description

The present invention relates to a method of recognizing objects of the coin type.

EP-A-0 420 921 discloses an automatic payment device in which a separating disc receives on its upper face the coins or tokens to be separated and comprises at its periphery cells intended to each receive a coin or token. For this purpose, the cells open through the upper face of the disc. They also open opposite a fixed peripheral wall forming a lateral guide wall for the coins or tokens driven in rotation by the cells. Along this path, the pieces slide on a fixed supporting surface. They pass within the field of action of a detector. They then reach a passage opening towards a circular display located next to the rotating disc. Depending on the result of the detection operated by the detector, the passage opening is configured according to one or the other of two different configurations leading the coins or tokens either to a peripheral compartment of the display or to a central compartment. There are three central compartments and three peripheral compartments. When a presentation region comprising a central compartment and a peripheral compartment is in a position to receive the coins or tokens coming from the separating disc through the passage opening, another presentation region comprising another peripheral compartment and another compartment central is in a display position, in which the coins or tokens corresponding to a previous payment are visible by the users, while a third presentation region, comprising the third peripheral compartment and the third central compartment, is in a position for transmitting the coins or tokens to a subsequent station, for example a chest for storing the coins or tokens, a return device for coins or tokens not accepted, etc.

On the disc, a delivery bar is intended to prevent the superimposed parts from reaching the detector. But as the delivery bar must be placed at a sufficient distance from the bearing surface to allow the passage of the thickest parts, this bar is in some cases incapable of preventing the simultaneous passage of two thin parts which would have lodged in the same cell. In any case, if the second part protrudes from the upper surface of the disc, it is dangerous to try to dislodge it by the delivery bar as this may cause blockage and damage. This problem cannot be solved by thinning the disc as this would allow a thin piece to pass between the upper surface of the disc and the delivery bar.

Other disturbances in the rotation of the disc can occur, especially if foreign bodies have entered the chamber where the disc spins. These foreign bodies can be housed between the disc and the delivery bar, or under the detector, between the disc and the bottom wall, or even in the moving parts defining the configuration of the passage opening. In the event of such an incident, cleaning the known device may take some time and therefore result in a disturbance detrimental to the proper functioning of the entire toll booth.

It may happen that certain parts are doubtful, that is to say that the response of the detector to the passage of the part differs only very little from the response corresponding to a valid part. Such a part may be refused by the device. This leads to an unnecessary operating disruption if in reality it is for example a very worn part but still valid.

Finally, in the known apparatus, the presentation device is quite bulky since its diameter is greater than that of the separation device and it therefore more than doubles the surface necessary to accommodate the two devices side by side, compared to that which 'would require the separation device alone.

The object of the present invention is to remedy these drawbacks.

According to the invention, a method of recognizing objects of the coin type is provided, in which the objects are passed one by one within the field of action of a detector belonging to a recognition device, and in depending on the detector's response to the passage of each object, the object is selectively directed to at least one output of the recognition device and respectively the object is returned to the detector's field of action.

Other features and advantages of the invention will emerge from the description below relating to nonlimiting examples.

• la figure 1 est une vue schématique en perspective d'un appareil de paiement automatique mettant en oeuvre le procédé selon l'invention ;
• la figure 2 est une vue analogue à la figure 1 lorsque le capot du séparateur est enlevé ;
• la figure 3 est une vue schématique de l'appareil en coupe axiale ;
• la figure 4 est une vue en coupe selon la ligne IV-IV de la figure 2, avec représentation du capot du séparateur, lors du passage d'une pièce depuis le séparateur vers le présentoir ;
• la figure 5 est une vue en perspective d'une partie de la paroi porteuse et de la paroi de guidage latéral du séparateur ;
• la figure 6 est une vue en élévation de cette partie de la paroi de guidage latéral, avec coupe de la paroi porteuse ;
• la figure 7 est une vue en plan de la même partie de la paroi de guidage latéral ;
• les figures 8, 9, 10 et 12 représentent quatre stades successifs du processus d'éjection d'une pièce superposée ;
• la figure 11 est une vue en coupe selon le plan XI-XI de la figure 10 ;
• la figure 13 est une vue en perspective montrant la lame de refoulement en train d'empêcher une pièce de progresser vers le détecteur sans s'être logée dans une alvéole ;
• les figures 14 et 15 sont deux vues en perspective montrant respectivement la face intérieure et la face extérieure du capot ;
• la figure 16 est une vue d'un détail de la figure 4 dans le cas d'une pièce non admise, donc empêchée de passer du séparateur vers un compartiment extérieur du présentoir ;
• la figure 17 est une vue analogue à la figure 3 mais lorsque la monture est en position de purge ; et
• la figure 18 est un organigramme d'aiguillage des pièces.

In the accompanying drawings:

• Figure 1 is a schematic perspective view of an automatic payment device implementing the method according to the invention;
• Figure 2 is a view similar to Figure 1 when the separator cover is removed;
• Figure 3 is a schematic view of the apparatus in axial section;
• Figure 4 is a sectional view along the line IV-IV of Figure 2, with representation of the separator cover, during the passage of a part from the separator to the display;
• Figure 5 is a perspective view of part of the carrier wall and the lateral guide wall of the separator;
• Figure 6 is an elevational view of this part of the lateral guide wall, with section of the carrier wall;
• FIG. 7 is a plan view of the same part of the lateral guide wall;
• Figures 8, 9, 10 and 12 show four successive stages in the process of ejecting a stacked part;
• Figure 11 is a sectional view along the plane XI-XI of Figure 10;
• FIG. 13 is a perspective view showing the delivery blade preventing a part from advancing towards the detector without being housed in a cell;
• Figures 14 and 15 are two perspective views respectively showing the inner face and the outer face of the cover;
• Figure 16 is a view of a detail of Figure 4 in the case of a part not admitted, therefore prevented from pass from the separator to an external compartment of the display;
• Figure 17 is a view similar to Figure 3 but when the frame is in the purge position; and
• Figure 18 is a flow diagram of parts switching.

As shown in Figures 1 to 3, the payment apparatus comprises a separator 1 in turn comprising a disc 2 which, in the service position shown in Figures 1 to 3, is in a plane P (Figure 3) forming an angle A of approximately 45 ° with the vertical direction. The disc 2 has on its periphery cells 3 which open through an upper face 4 of the disc 2 and through its peripheral edge 6, opposite a lateral guide wall 7 which is integral with a frame 8 of the device. The bottom of the cells 3 is closed by a support face 9 for the coins or tokens, constituted by the upper face of a bottom plate 11 (FIG. 3). The disc 2 is connected in rotation to the output shaft 12 of an electric motor 13, the casing 14 of which is fixed to the underside of the plate 11. The plate 11 belongs to a frame 16 which is connected to the frame 8 of the apparatus by a hinge 17 which is adjacent to an upper region of the disc. The axis 18 of the articulation 17 is substantially horizontal and parallel to the plane P. In the service position shown, the frame 16 is locked by a locking device 19 diametrically opposite the articulation 17, and which secures the frame 16 with the frame 8 of the device.

The separator 1 further comprises a cover 21 traversed by the outlet orifice 22 of a hopper 23 into which the users throw coins, tokens or the like. The cover 21 is connected to the frame 8 of the device by a hinge 24 which is close to the hinge 17 and the upper region of the disc to allow the cover 21 and the hopper 23 to be raised when it is necessary to access disc 2, especially for maintenance.

The coins 26 (figure 1) which are thrown into the hopper 23 meet a central conical reinforcement 27 (figures 2 and 3) of the disc 2 then move towards the lower region 28 of the disc 2, being prevented from falling lower by the cover 21. Some parts are housed in the cells 3 which are in the lower region 28 of the disc and these parts are driven upwards in the direction of the arrow F in FIG. 2 by the rotation of the disc 2. This rotation also brings in the lower position new cells in which other parts are housed and so on until all the parts corresponding to the payment made are driven upwards by the cells 3 in the direction of the arrow F .

During this movement, the pieces pass through a splitting station 29 (FIG. 2) then into the field of action of a detector 31 which is only shown in dashed lines in FIG. 2 and which is for example of the type described in EP-A-0 420 921, in which case it is placed above the path of the coins or tokens and eccentrically with respect to this path, then finally by a station 32 for distributing the coins or tokens to destination of a display 33 which will be described in detail below.

The splitting station 29 comprises (FIGS. 5, 6, 7) a notch 34 which is formed in the face inner peripheral and in the upper face of the lateral guide wall 7. The notch 34 is therefore open towards the disc 2 of which only the upper face 4 is represented by a dashed line in FIGS. 5 and 6.

The notch 34 has a substantially flat inclined bottom 36. When one traverses the bottom 36 in the direction of rotation of the disc (arrow F), one starts from a low region 37 of the bottom to arrive at a high region 38. The low region 37 of the bottom 34 is located higher than the carrier face 9 of the carrier surface 11 and lower than the upper face 4 of the disc 2. The upper region 38 is further from the carrier face 9 than the lower region 37. In the example shown, the upper region 38 is even much further from the carrier face 9 than the upper face 4 of the disc.

In addition, when the notch is traversed in the direction F of movement of the cells, the lower region 37 of the notch widens radially and then the upper region 38 shrinks radially.

It is also important to note that the notch 34 is located opposite an ascending region of the path of the cells, and more particularly in the first half of the upward path of the cells, so that the carrier face 9 and the upper face of the disc lean towards the lateral guide wall 7 where the notch 34 is located.

A discharge blade 39 is fixed to the cover 21 (see FIG. 2 and also FIGS. 14 and 15) so as to be in contact or almost in contact with the upper face 4 of the disc 2 at a location which is located after the notch 34 relative to the direction of travel of the cells, symbolized by the arrow F. The relative situation of the notch 34 and the delivery blade 39 is visible in FIG. 2 and in FIG. 13. The delivery blade 39 is intended to prevent the passage of objects which would significantly protrude relative to the upper face 4 of the disc 2. However, the discharge blade 39 is made elastic to avoid mechanical impact with said objects.

We will now describe, with reference to Figures 8 to 13, the operation of the splitting station.

The main purpose of this station is to prevent two causes of malfunction: the presence of two superimposed parts in the same cell 3 of the disc 2 (Figure 8); and the presence of a part 41 or other object resting on the upper face 4 of the disc 2 as shown in FIG. 13. The distance between the delivery blade 39 and the carrying face 9 must be sufficient to allow the passage of the thickest parts under the blade 39. In addition, the distance between the blade 39 and the upper face 4 of the disc 2 must be small enough to prevent the passage of the thinnest parts likely to be received by the device. As a result, the disc 2 must have a certain minimum thickness that cannot be reduced and this minimum thickness allows two thin pieces to be entrained in superposition in the same cell 3 (FIG. 8).

When two pieces thus superimposed arrive opposite the notch 34, the part 41 above, which will be called below "the superimposed part" deviates radially outward from the other in entering the notch 34 (Figure 9). This results from the fact that the superimposed part 41 is subjected, in the example, to the cumulative effect of the centrifugal force, due to the rotation of the disc 2, and of gravity because the carrier face 9 leans towards the notch 34. The lower region 37 of the bottom of the notch 34 is close enough to the carrying face 9 to allow the radial sliding of the superimposed part 41 even if the underlying part 42 is particularly thin. However, since the lower region 37 is nevertheless at a certain distance from the support surface 9, the underlying part 42 cannot penetrate into the notch 34.

As the two parts 41 and 42 continue to be entrained by the disc 2, the superimposed part 41 traverses the bottom of the notch 34 and thus reaches the upper region 38 of this bottom, which takes it off from the underlying part 42 and raises it until the point 43 of the superimposed part 41 on which the edge of the cell 3 rests to push the part 41 in the direction F, passes above the upper surface 4 of the disc (Figures 10 and 11). Therefore, the superimposed part 41 escapes from the cell 3 (Figure 12). As this happens in an ascending region of the path of the cells, the superimposed part 41 tends to go back relative to the disc and go to be housed in the next cell if it is free.

However, it is feared that there will be established between the superimposed part 41 and the upper surface 4 of the disc an adhesion contact which drives the part 41 in the field of the detector 31 (FIG. 2) before it has the time to stay in a next cell 3. The discharge blade 39 (FIG. 13) avoids this risk and stops the part 41 before it reaches the detector. Blade 39 has a shape of deflector which deflects the part 41 towards the center of the disc, as a result of which the part 41 can fall towards the lower region of the disc and occupy a new cell.

The detector 31 recognizes the coin, or on the contrary detects that the coin or other token which has been introduced does not correspond to any known type, unless it gives an answer of doubt, a situation which will be studied later. The detector 31 is placed above the end of the upward path of the cells. The distribution station 32 which follows is mainly placed in the first half of the path down from the cells.

The distribution station 32 (FIG. 2) includes a passage opening 43 for the parts which, according to the result of the detection operated by the detector 31, are considered to be good, and, after the opening 43 relative to the direction of rotation F of the disc 2, a passage opening 44 for the parts which have been recognized as not valid by the detector 31. The openings 43 and 44 are made through the lateral guide wall 7 opposite a recess 46 or respectively 47 formed in the carrying face 9. Each recess 46 or 47 communicates with the passage opening 43 or 44 associated by a respective tunnel 48 (FIG. 4) formed in the plate 11. A hatch 49 fixed to the plunger core of an electro- magnet 51 for actuating this flap is movable so as to be able to assume a release position (FIGS. 2 and 4) in which the flap is retracted downwards to clear the recess 46 and thus allow the coins ie 52 contained in the cells to fall into the recess 46 then from there to pass by gravity through the tunnel 48 and the opening of passage 43 in the direction of the display 33. To allow this movement by gravity, the tunnel 48 has an oblique orientation relative to the local radial direction so that the path of the parts from the recess 46 to the display is generally descending thanks to the inclination of the plane P.

In another position, or closed position (FIG. 16), the flap 49 closes the recess 46 so that the upper face 53 of the flap 49 completes without significant discontinuity the carrying face 9 of the plate 11. The electromagnet 51 is controlled to place the hatch 49 in the closed position for the passage of a cell 3 of the disc 2 when the detection operated by the detector 31 has revealed that the part 52 is not of a model accepted by the device or that Exhibit 52 has not been identified with certainty. In this case, a part such as 52 continues its path along the lateral guide wall 7 until it meets the second recess 47, which is equipped, in the same way as the first recess with a hatch 50 ( in the closed position in Figure 2) controlled by an electromagnet. If the room is recognized as not admitted, this second hatch 50 is open and the room falls there to leave towards the display 33 through the passage opening 44 after having passed through a tunnel similar to the tunnel 48 of FIG. 4. If the room is doubtful, the hatch 50 of the second recess 47 is closed and the part is again driven by the disc 2 towards the detection means.

A part which is presented opposite the passage openings 43 or 44 during the rotation of the display unit 33, rotation which will be explained below, is also returned to the detector's field of action, to avoid the part will interfere with the rotation of the display.

This process is explained by the flowchart in FIG. 18. The step 94 "detection" includes detection by the detector 31. The test 96 checks whether the display 33 is ready or if, on the contrary, it is moving. In the second case, the part is returned to detection (step 94), that is to say that the two doors 49, 50 are kept closed. If the display unit 33 is ready, the result of the detection is subjected to a test 97. If the part is recognized as acceptable, the flap 49 opens and the part can pass through the opening 43 towards the display 33. Otherwise, the result of the detection is subjected to a second test "part refused ? " 98. If the piece is unambiguously recognized as being different from the acceptable pieces, the hatch 49 is kept closed and the hatch 50 is open to allow the piece to exit through the opening 44 towards the display 33. If the piece is not not recognized with certainty as a different part from the accepted parts, we carry out a test "first pass?" 99. During this test, it is checked whether a questionable part, that is to say neither accepted nor refused, has already passed into the field of action of the detector 31 by occupying the same cell 3 of the disk 2. This is achievable by knowing the number of cells in the disc and counting the cyclic disturbances created by the passage of cells in the detector field. If the answer is no, in other words if the questionable coin has just made its first pass in the detector field, its position in the cycle is memorized (step 101), and it is returned to the detector's field of action ( step 94) to give it a new chance of identification. It is precisely the memorization step 101 which then makes it possible to count the cell passages under the detector 31 until the second passage of the room. If the piece is positively accepted or refused on the second pass, this memorization is then erased. If, on the second pass, the part is again dubious, it is sent to the passage opening 44 ("NO" output in test 99).

The display 33 is an annular display surrounding the separator 1 and it comprises three presentation regions 54a, 54b and 54c distributed angularly around the axis of the disc 2 (FIG. 2).

Each presentation region 54a, 54b, 54c includes two compartments 56 and 57 for the accepted coins and respectively for the rejected coins. The compartments have shapes in a circle sector. A central rib 58, of generally circular shape, separates the compartments 56 located radially outside and the compartments 57 located radially inside. Two other ribs of generally circular shape 59 and 61 limit the compartments radially outwards, and respectively radially inward the compartments 57. The ribs 58, 59 and 61 are integral with the frame 8 of the device, likewise a plate 62 on which the parts rest and can slide.

The inner peripheral ribs 61 and central 58 have for the passage of the accepted parts two passages 63 and 64 aligned opposite the opening 43 along the desired oblique path relative to the local radial direction from the recess 46 to the radially outer compartments 57 intended for accepted parts.

In addition, the radially inner rib 61 has, after passage 63 relative to the direction of travel F of the cells, a second passage 64 opposite the passage opening 44 for the passage of the parts from the recess 47 in the radially compartments 57 interiors intended for rejected parts.

The presentation regions 54a, 54b and 54c are separated by partitions. There are in particular three external partitions 68 which separate the radially external compartments 56 from one another and extend between the central rib 58 and the external peripheral rib 59. The partitions also comprise three internal partitions 69 which separate one from the other, the radially inner compartments 57 and extend between the central rib 58 and the inner peripheral rib 61. The partitions 69 are of relatively great circumferential length and are each crossed by a passage 71.

The partitions 68 and 69 are fixed to the underside of a transparent cover 72 which is of annular shape and of which, for reasons of clarity, only a portion of the radially outer edge has been shown (by small crosses). 73 situated radially beyond the outer peripheral rib 59, and a part of the radially inner edge 74 which is roughly adjacent to the inner peripheral rib 61.

For its positioning, the cover 72 rests on three support rollers 76 with a radial axis, supported in rotation by the frame 8, and it is centered between three centering rollers 77 resting on the outer peripheral edge 73 of the cover 72. The three load-bearing rollers 76 are free to rotate, as are two of the centering rollers 77, which are supported by the frame 8 of the device. The third centering roller 77 (top right of FIG. 2) is supported in rotation by a yoke 78 which is pushed by a spring 79 so that the roller 77 tends to bear elastically both against the peripheral edge 73 of the cover 72 and against the output shaft 81 of an electric motor 82 (FIG. 4) for rotating the cover 72 around the axis of the disc.

By means of control not shown, the motor 82 is excited to rotate the cover 72 by a third of a turn in the direction of the arrow F each time a payment has been made. When the cover 72 is stopped, as shown in FIG. 2, there is a partition 68 which is located just before the passage 64 provided in the central rib 58, and a partition 69 which is stopped just before the passage 67 through the inner peripheral rib 61, while the passage 71 of the same partition 69 extends obliquely downward, relative to the local radial direction, from the passage 63 through the inner peripheral rib to the passage 64 through the central rib 58.

The presentation region (54a in FIG. 2) which is limited at the rear by the two partitions 68 and 69 located in the position which we have just spoken of, that is to say just before passage 64 and respectively the passage 67 is in a position known as receiving the parts. Indeed, if a part is authorized to leave the separator through the passage opening 43, it will reach by gravity the radially outer compartment 56 of the region 54a after having crossed the passage 63, the corridor 71 and the passage 64. In addition, a part authorized to leave the separator through the opening 44 as described above reaches the radially inner compartment 57 after having crossed the passage 67.

Meanwhile, another presentation region, 54b, is in the presentation position, in which one can observe the coins contained in the two compartments 56 and 57 of this region, coins which correspond to the previous payment. During this time, the third presentation region 54c is in the transmission position: the partitions 68 and 69 which delimit the rear of this region (top left of FIG. 2) have pushed the pieces corresponding to an even previous payment. through orifices 83 and 84 respectively leading to a collection chest and to a means for returning the pieces refused to the user. Not shown in detail, the orifice 83 can be closed, for example if the corresponding trunk is full, in which case the parts will be evacuated through a second orifice 86 leading for example to another trunk.

Each time a payment has been made, the motor 82 is controlled to rotate the cover 72 by a third of a turn, so that the presentation region which was in the reception position changes to the presentation position, that which was in the presentation position changes to the transmission position and the one that was in the transmission position returns to the receiving position. It is during this last movement that the parts pass through the orifice 86 if the orifice 83 was closed.

During this movement, the parts contained in each presentation region are, at least during the upward phase of the journey, pushed by the partitions 68 and 69 located at the rear of the compartment, the downward phase being effected by gravity . It should be noted in this regard that the plate 62 extends in a plane Q parallel to the plane P of the disc 2, although slightly lowered relative to the latter, by a distance h, (see in particular FIG. 3) for that the parts which have fallen into the recess 46 or the recess 47 can then slide on the plate 62 without encountering any obstacle.

It may happen that foreign bodies, more or less harmful to the proper functioning of the device, enter the chamber defined between the carrying surface 11 and the cover 21. It can for example be objects thrown by malice into the hopper 23. These objects are liable to damage the disc, the detector 31, the discharge blade 39, etc.

To this end, the locking device 19 (FIG. 3) comprises an electromagnet 87 for unlocking control, capable of retracting a lock 88 of the locking device 19 against a return spring 89. When the lock 88 is retracted, the mount 16 and with it the motor 13 and the disc 2 can pivot down around the articulation 17 to the position shown in FIG. 17, called the purge position, in which the disc 2 s 'is spaced from the cover 21, the detector 31, the lateral guide wall 7 and the discharge blade 39. The disc 2 is then in a plane P ₁ forming with the vertical direction an angle B less than the angle A in Figure 3. This position is defined by support of the mount 16 against a stop 91. In this position, the fall of foreign bodies likely to be on the disc 2 is favored, in particular if these bodies were initially held captive by friction between the disc 2 and for example the cover 21 , the discharge blade 39 secured to the cover 21 or the detector 31 fixed to the frame 8 of the device. To further promote the fall of foreign bodies, it is possible to cause the motor 13 to rotate in alternating directions or in only one direction. This is possible because the pivoting of the mount 16 towards the purge position in no way affects the coupling between the motor 13 and the disc 2. An actuator 92, for example an electromagnet, is provided to bring the mount 16 back into the service position. This actuator 92 can also be used to shake the frame 16 and further promote the fall of foreign bodies. When the actuator 92 is excited to bring the frame 16 back into the service position, a ramp 93 secured to the frame 16 temporarily pushes the latch 88 in the retracted position against the spring 89 until the frame 16 having reached the operating position, the latch 88 returns to the projecting position under the action of the spring 89 and automatically locks the frame 16.

Of course, the invention is not limited to the example described and shown.

For example, a so-called "conical" disc can be used, the cells of which are arranged in a truncated cone having an axis which may be vertical. There is thus at all points of the periphery a slope by which the parts tend to move radially outward from the disc. In such a case, the annular display itself has, advantageously a frustoconical shape.

The hatches 49 and 50 can be replaced by pivoting flaps, or even by gates formed in the lateral guide wall.

Claims (3)

Method for recognizing objects of the coin type, in which the objects are passed one by one within the field of action of a detector (31) belonging to a recognition device (1), and according to the response of the detector to the passage of each object, the object is directed selectively to at least one output (43, 44) of the recognition device (1) and respectively the object is returned to the field of action of the detector (31) . Method according to claim 1, in which when an object is returned for a second passage in the field of action of the detector (31), it is made to follow a predetermined cycle and its position is identified in this cycle, then at after the second pass, the object is sent to the outlet (43, 44) of the recognition device (1). Method according to claim 1, in which, through the outlet, the pieces are sent to a display (33) movable in steps to receive in different presentation regions (54a, 54b, 54c) batches of successive objects, and in which an object is presented for a second passage in the field of action of the detector (31) facing the exit (43, 44) while the display (33) is moving one step .

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