EP2441682B1 - Device for channelled distribution of tablets and method for implementing same - Google Patents

Description

The present invention relates to the field of the packaging of blister packs and, more particularly, the tablet dispensing devices in a blister pack of conditioning which proceed by channeling the tablets into channels leading them into the cells of said strip, it being continuous and driven to scroll below the dispensing device. The invention relates more specifically to the realization of the multi-channel channeling means for guiding the tablets until they are deposited in the cells of a hollow strip driven in a packaging machine, and the design and production of the associated means useful to the operation of the whole.

The term "tablets" is intended here to mean any units in discrete form which may be tablets of any shape (round, oblong, etc.), but also capsules, capsules, or any other type of unit which must be put into place in the different cells of a blister strip to be packaged into platelets. The invention applies more particularly, but not exclusively, in the pharmaceutical field.

There are many packaging facilities for disposing tablets or similar objects in the cells of a moving honeycomb strip below a dispensing device bringing the tablets. The blister strips, once the tablets are deposited in the cells, receive at another station a closure film (for example an aluminum protective film), and then they are cut into platelets. The honeycomb strips are generally made by thermoforming the cells in a sheet of synthetic material.

Among these installations, the invention is more specifically concerned with those in which the distribution of tablets involves guiding the tablets along multi-channel ramps, in so-called channelized distribution devices, or channelized guidance devices. Among the ducted guide devices, there are three main types of ramps, according to which the path of the tablets, in series one after the other, in their respective guide channels, is provided solely by gravity, thanks to the inclination of the the orientation of the ramp in space, or that it is provided by vibrating the ramp, it being understood that the two solutions are often applied together.

The main problem of these channelized distribution ramps comes from the speed of introduction of the tablets into the channels, which is insufficient compared to what can allow the speed of movement of the tablets once in the channels and the speed of scrolling of the cellular tape. The tablets are generally presented in bulk from an inclined and / or vibrating ramp in a feed tank where they accumulate in an area where they are stirred and discharged, for example by a rotating brush with flexible blades which brings them into the mouth of the distribution channels. The introduction of tablets can also be done only by vibration. It is understood that this introduction may be irregular and create an insufficient supply of channels in tablets. There may be insufficiently filled channels and, therefore, to overcome this problem, a slotted tape speed of less than what it could be if the channels were still correctly filled should be used. Clearly, the industry is in demand for ways to accelerate cell filling rates.

The object of the invention is therefore to remedy this problem and to increase the filling rate of the cells by increasing the overall flow of tablets without affecting the feed stability and the regularity of the filling of the strips.

The invention proposes for this purpose to split the ramp into two parts, an upstream portion where the tablets are introduced, in a conventional manner from a bulk feed tank, and a part downstream from which the tablets come out to be deposited in the cells of the receiver band, and by providing to provide the upstream ramp portion of longitudinal channels in a number multiple of the number of useful channels that the downstream ramp portion has. More specifically, it is advantageously provided that for each downstream channel useful for filling a column of cells in the strip running under the downstream ramp, several channels of the upstream ramp are associated, at least in number of two for each downstream channel, in a disposition to put them in turn in communication with the corresponding channel of the downstream ramp. To enable switching, the upstream ramp is made mobile transversely. The transverse direction is here expressed relative to the longitudinal direction of the channels, that is to say, in general, also with respect to the direction of travel of the blister strip in a packaging machine. Furthermore, upstream and downstream are obviously defined with respect to the direction of flow of the tablets to the cells.

The prior art in the field is illustrated in particular by the patent document GB 882 494, published November 15, 1961 . It contains the notion of a division of the inclined distribution ramp between an upstream portion and a downstream portion, and it is expected that the upstream ramp may comprise a number of channels greater than the downstream ramp. But there is no suggestion that one-to-one connections be established between the upstream and downstream channels, taking in turn two different channels in the same downstream channel. It is not intended, either, to perform a permutation simultaneously on multiple channels, because the shutter is performed separately on each channel between upstream channel and downstream channel.

With respect to such a prior art, the objectives of the present invention are achieved by the features which are the subject of claim 1 principally, by the other claims on a secondary basis, as well as by explanations about them which will emerge of the description below of an embodiment of the invention illustrated by the figures.

1. 1. On arrête l'écoulement des comprimés à la sortie des canaux de la rampe amont par envoi d'un signal automatisé vers un vérin qui pousse les moyens d'arrêt des comprimés vers les canaux amont ;
2. 2. On détecte la présence de comprimés à l'entrée des canaux de la rampe aval afin de déterminer si le déplacement transversal de la rampe amont est autorisé ;
3. 3. Si aucun comprimé n'est présent à l'entrée des canaux, on envoie alors un signal de commande d'un autre vérin, par exemple, pour déplacer la rampe amont transversalement dans son débattement vers l'un des côtés et mettre en connexion chaque canal aval avec un premier des canaux amont qui lui sont associés ;
4. 4. Quand le détecteur de fin de course signale que la rampe amont a atteint une butée présente sur ledit côté, on commande le vérin des moyens d'arrêt de manière à libérer le passage des comprimés dans chaque canal amont et à laisser ainsi les comprimés remplir les canaux
   aval et s'écouler jusque dans les alvéoles de la bande alvéolée en défilement sous les canaux aval ;
5. 5. On laisse la circulation des comprimés s'effectuer par les passages connectés jusqu'au déclenchement d'une nouvelle opération de permutation des connexions, laquelle peut être déterminée notamment, de manière automatique, soit par un délai de temporisation réglé par avance, soit suite à la détection d'un degré de remplissage insuffisant des canaux aval en cours d'utilisation ;
6. 6. On commande alors les moyens d'arrêt pour un blocage temporaire de la circulation des comprimés en amont comme à l'étape 1 ;
7. 7. On détecte comme à l'étape 2, la présence éventuelle de comprimés à l'entrée des canaux aval de la rampe aval ;
8. 8. Si aucun comprimé n'est détecté à l'entrée des canaux, on commande le vérin de déplacement de la rampe amont pour déplacer celle-ci transversalement vers le côté opposé à celui mentionné pour l'étape 3 et mettre chaque canal aval en communication avec l'autre canal amont ;
9. 9. Comme à l'étape 5, on détecte la fin de course de la rampe amont lorsqu'elle a touché la butée dudit côté opposé et on commande de la même manière le relâchement des moyens d'arrêt des comprimés pour laisser à nouveau les comprimés s'acheminer pour remplir les canaux et s'écouler jusque dans les alvéoles de la bande alvéolée en défilement sous les canaux aval.

This description illustrates the use of the dispensing device in a tablet packaging process by channeling the tablets to their deposit in the cells of a moving honeycomb strip, according to which the channelized distribution device is implemented with its guide channels of the tablets and its means of permutation connections between upstream channels and downstream channels by transverse displacement of the upstream ramp with respect to the downstream ramp. According to this method, the automatic sequence of the various operating steps of a periodic cycle is controlled, which is described below by placing itself in the particular case of a permutation of the connections between two upstream channels alternately (this case also corresponding to a form preferred industrial implementation, if only for its simplicity of construction).

1. 1. The flow of tablets is stopped at the outlet of the channels of the upstream ramp by sending an automated signal to a jack which pushes the means for stopping tablets to the upstream channels;
2. 2. The presence of tablets at the inlet of the downstream boom channels is detected to determine whether transversal displacement of the upstream boom is allowed;
3. 3. If no tablet is present at the entrance of the channels, then a control signal is sent from another cylinder, for example, to move the upstream ramp transversely in its travel towards one of the sides and put in connecting each downstream channel with a first of the upstream channels associated therewith;
4. 4. When the limit switch signals that the upstream ramp has reached a stop present on said side, the cylinder of the stop means is controlled so as to release the passage of the tablets in each upstream channel and thus to leave the tablets fill the channels
   downstream and flow into the alveoli of the cellular strip running under the downstream channels;
5. 5. The circulation of the tablets is allowed to take place through the connected passages until a new operation of permutation of the connections is triggered, which can be determined in particular, automatically, either by a delay time set in advance, or following the detection of an insufficient degree of filling of the downstream channels in use;
6. 6. The stop means is then controlled for temporarily blocking the circulation of the tablets upstream as in step 1;
7. 7. As in step 2, the presence of tablets at the inlet of the downstream channels of the downstream ramp is detected;
8. 8. If no tablet is detected at the entrance of the channels, the displacement cylinder of the upstream ramp is controlled to move it transversely to the opposite side to that mentioned for step 3 and to put each downstream channel into communication with the other upstream channel;
9. 9. As in step 5, the end of travel of the upstream ramp is detected when it has touched the abutment of said opposite side and the release means of stopping the tablets are also controlled in the same way to leave the The tablets run to fill the channels and flow into the alveoli of the honeycomb strip running under the downstream channels.

After a normal flow delay as in step 5, the cycle is repeated by repeating, each time a permutation is triggered, the series of steps 1 to 4 or 6 to 9 which ensure the synchronization of the movement of the ramp. upstream with the absence of tablets in the area of the junction plane between the two ramps, for the entire duration of filling of the cells of the moving honeycomb strip. The filling conditions are optimal, in the as it is easy to ensure that the automatic switching operations are fast with respect to the length of the downstream ramp.

According to one particular embodiment of the invention, the method of packaging the tablets is such that it comprises, before step 1, a step according to which tablets are poured from a feed tank onto an area of arrival of said guiding device, the tablets flowing by gravity and / or vibration to an accumulation zone against a rotating blade brush which discharges and brews the tablets to enter the guide channels of the ramp upstream, the level accumulation accumulation zone being detected by a detector, in particular which may be optical, to control the sending of a signal to stop or trigger the spill in the arrival zone.

• la figure 1 est une vue générale en perspective et en écorché du dispositif de guidage canalisé selon l'invention dans une machine de conditionnement de comprimés,
• la figure 1A est une vue du dispositif selon la figure 1,
• la figure 2 est une vue en coupe du dispositif de la figure 1, approvisionné en comprimés, suivant le plan d'un canal amont et un canal aval connectés ensemble;
• les figures 3A et 3B sont deux vues en perspective de moyens d'arrêt des comprimés dans le dispositif selon l'invention,
• et les figures 4A et 4B illustrent schématiquement le dispositif en vue de face, en écorché, et en élévation.

The invention will now be more fully described in the context of preferred features and their advantages, with reference to Figures 1 to 4B in which :

• the figure 1 is a general perspective view and cut away of the channeled guiding device according to the invention in a tablet packaging machine,
• the Figure 1A is a view of the device according to the figure 1 ,
• the figure 2 is a sectional view of the device of the figure 1 , supplied with tablets, according to the plan of an upstream channel and a downstream channel connected together;
• the Figures 3A and 3B are two perspective views of means for stopping the tablets in the device according to the invention,
• and the Figures 4A and 4B schematically illustrate the device in front view, cutaway, and elevation.

The figure 1 discloses a general view of a channeled guiding device according to the invention in a packaging machine seen in cutaway, casings which enclose the movement transmission members controlling the moving parts, as well as protective plates which participate in the channeling of the tablets, having been removed to reveal the internal part of said device.

The Figure 1A corresponds to the figure 1 , but the housings and plates are in place to show the external general appearance of the device. Protective housings or plates can enclose particular moving mechanical parts and protect these parts of the dust that can be generated by the units to be packaged and facilitate cleaning. Furthermore, plates are placed above the grooves of the channels to allow in particular to maintain the tablets and form a complete entity of pipe for their transport, and also to protect them.

The feeding device comprises an arrival zone A of tablets and a pipe ramp R provided with longitudinal channels 31, 32 for guiding the tablets. This ramp is divided into two ramps, an upstream ramp 1 and a downstream ramp 2. The upstream ramp 1, which is transversely movable, comprises two parts, an upper portion 10 slightly inclined and a tilting portion 11 more inclined. In each of its two parts 10 and 11, the upstream ramp comprises upstream channels 31, all similar, which are in the form of grooves hollowed in the mass of the ramp, which is usually made of metal or a plastic material of food grade. The upper part 10 is located at a zone B accumulation of tablets.

The downstream ramp 2, disposed vertically, comprises five downstream guide channels 32, the same number as that of the cells 41 to be filled simultaneously, that is to say the same number of rows of cells in scrolling of the cellular tape. She is fixed. The downstream channels 32 are similar in the form of grooves dug in the metal of the ramp and covered with a plate (of metal or plastic food for example) forming the top of the channel.

The upstream ramp 1 comprises ten upstream channels 31 side by side.

The upstream channels 31 of the upstream ramp 1 are therefore in double number of the downstream channels 32 of the downstream ramp 2. The channels 32 of the downstream ramp 2 are of the same width as that of the upstream channels 31 of the upstream ramp 1 but they are more spaced. The distance between the centers of the downstream channels 32 is twice the distance between the centers of the upstream channels 31. At each channel 32 of the downstream ramp, the upstream ramp 1 thus associates two upstream channels 31, which will also be called paired, paired or matched.

The tablets come from a hopper forming a feed tank located above the packaging machine, from which they fall through a feed pipe (not shown) on the slightly inclined plane of the arrival zone A.

These tablets then slide towards the ramp R of pipe to accumulate in the part B of this device, where, here by means of a rotating brush P with flexible blades 5, which rotates in the direction of the clockwise when we look at the figure 1 , they are pushed back and brewed in order to enter the conveyor channels 31 of the upstream ramp 1 at the zone I. A level detector 6 is connected to the feed hopper to control the supply of tablets , to allow it or not.

Tablets entering the upstream channels 31 will then flow by gravity following these upstream channels 31 of the upstream ramp 1, which is in inclined plane, and continue their journey in the downstream channels 32 of the downstream ramp 2, connected alternately to one channel on two of the upstream channels 31. The tablets then fall into the five cells 41 of the cellular strip 4 which scrolls underneath.

The spacing between the downstream channels 32 is such as to shift the channels 31 of the upstream ramp 1 by a distance equal to that of the spacing between two upstream channels 31 so that the coupled channels 31 alternatively feed each channel 32 downstream as explained below with reference to Figures 4A and 4B .

A housing 7 comprises various actuators of the guide device, in particular an end-of-travel adjustment bar for the upstream ramp. This bar 8 is not visible on the Figure 1A . It is described more fully in Figures 4A and 4B . The housing 7 also comprises the control means for the means for stopping the tablets, which are made in the case described in the form of a stopper part, not visible on the Figure 1A , controlled to block the circulation of the tablets before a transverse displacement of the upstream ramp. It also includes the actuator that allows the transverse movement of the upstream ramp. In addition, as part of an automatic operation of the assembly, an opto-electronic cell located at the top of the downstream ramp is configured to detect the filling level of the downstream channels.

The figure 2 is a sectional view of the device of the figure 1 , illustrated supplied with tablets in the plane of an upstream channel 31 and a downstream channel 32 connected to each other. The same elements as on the Figure 1A , tablets C being represented in addition.

On this figure 2 also appears inside the housing 7, the tablet holder part 9, which is connected to the upstream ramp 1. This part is actuated to block the descent of the tablets C at their passage of the channels 31 of the upstream ramp 1 to the channels 32 of the downstream ramp 2, before any transverse displacement of the upstream ramp 1, so as not to crush, section, or block tablets at this level during the displacement of the upstream ramp.

This stopper part 9 is actuated by a pneumatic cylinder, called here thrust cylinder V, or locking cylinder, which pushes this piece to the upstream channels to close them. More precisely piece 9 is here realized in the form of a bar, which carries fingers 91 in number equal to that of the number of channels 31 of the upstream ramp 1 to close, so here ten. These fingers 91 are of a width less than that of each channel 31; they are protruding outside the room 9. As explained below these fingers 91 will be introduced into the upstream channels without fully touching the bottom of the groove, to block the tablets without crushing, cutting, or damaging d in any way.

The Figures 3A and 3B are two views, in perspective, of the retaining piece 9, observed from two different angles. The fingers 91 are flexible and / or compressible. They are notably realized, as illustrated by the figure 3A , in the form of helical springs, for example stainless steel, bearing between two plates. Suitable resilient fingers may also be spring blades, which are illustrated on the figure 3A coming out obliquely from the box of room 9. These fingers have the role of closing the channels by blocking the passage of tablets. Their elasticity allows a modulation of their pressure and their depth of penetration into the channels, which prevents them from damaging the tablets that would still be present when the stopper part 9 is put into action.

The Figures 4A and 4B represent the guide device with the upstream ramp 1 of the ramp R moved respectively to the right and to the left, to explain the transverse movement of this upstream ramp 1 relative to the axis of symmetry of the ramp appearing in dotted lines in the figures.

The twinned channels 31 of the upstream ramp 1, in order to better explain the operation of the device, are distinguished and named 31d and 31g respectively for the right channel and the left channel.

The bar 8 for adjusting the transverse stroke of the upstream ramp 1 is shown at the top of the Figures 4A and 4B for the understanding of the displacement of the upstream ramp 1 of the device but in practice it is located preferentially in the housing 7.

On the Figure 4A , the ten upstream channels 31 of the upstream ramp 1 are shifted to the right, the tablets flow from the left channels 31g into the downstream channels 32; the tablets in the right upstream channels 31d are blocked by the full upper part of the downstream ramp 2.

An opto-electronic presence detection device 5, comprising an emitting cell 51 and a receiving cell 52 disposed on either side of the downstream ramp 2 and as high as possible at the beginning (at their entry) of the downstream channels 32 of the downstream ramp 2, to detect the presence or absence of tablets at the top of these downstream channels 32 and thus know whether the upstream ramp 1 can be moved, without damaging the tablets that would be at the top of the channels. Preferably, the distance between the cell 5 (here the cells 51, 52) and the inlet of the downstream channels 32 (at the top of the downstream ramp 2) must be smaller than the size of the tablets.

On the Figure 4B , the ten upstream channels 31 of the upstream ramp 1 are shifted to the left and the tablets therefore flow from the right channels 31d into the downstream channels 32. The tablets in the left upstream channels 31g are blocked by the solid upper part of the downstream ramp 32.

The guide device according to the invention therefore makes it possible to move the upstream ramp 1 from left to right so as to feed the downstream channels 32 according to the principle which will be described below.

The tablets entered in the upstream channels 31 of the upstream ramp 1 are stopped at the outlet of the upstream channels 31 by sending an automated signal to the thrust cylinder of the stop means 9 to the upstream channels 31 so that the fingers 91 stop the progress of the tablets that run in each upstream channel. Then, the presence of tablets C at the top (at the inlet) of the downstream channels 32 of the downstream ramp 2 with the cell 5 is detected in order to determine whether the displacement cross section of the upstream ramp may be allowed. If no tablet is present in the downstream channels, the information is used to control another jack W to move the upstream ramp 1 transversely to the right, by a distance equal to the distance between the centers of two twinned channels 31 , so as to put the left channel 31g of the upstream ramp in connection with the corresponding downstream channel 32. The limit switch 820 detects that the upstream ramp 1 has touched the right stop 810 and controls the thrust cylinder V to release the stop means 9 and thus let the tablets run to fill the downstream channels 32 and flow into the cells 41 of the honeycomb strip which runs under the downstream channels 32.

The flow of the tablets C is again stopped as in the preceding step, and the presence of tablets C at the inlet of the downstream channels 32 of the downstream ramp 2 is detected as before. If no tablet is detected at the top of Channels 32, a signal is sent again to said other cylinder W to laterally move the upstream ramp 1 to the left in order to put the second right upstream channel 31 d in connection with the channel 32 and fill it. The limit switch of the upstream ramp 1 is also detected by an end-of-travel detector 821 when it comes against the left stop 811.

The procedure is repeated periodically, by providing a movement back and forth of the upstream ramp 1, each go and each return being set by a programmed actuation of the tablet holding part 9, for example both. seconds. This actuation of the retaining piece could also be triggered by a signal related to a detection of the degree of filling of each of the downstream channels. Such detection can be done for example with the aid of a camera pointed at the downstream channels.

It is understood that in total, the invention allows the downstream channels 32 are always properly filled, enough so that the cells 41 are all filled with tablets in good condition, even when the longitudinal scrolling speed of the blister strip is substantially increased. For a given type of tablet, in the case of an inclined ramp and flexible blade brush device as described above, tests have revealed a flow rate of about 15 tablets per second in each downstream channel, ie a conditioning rate of 900 to 1000 tablets per minute, whereas in the prior art, the conditioning rate was only 700 tablets per minute.

The foregoing description clearly explains how the invention achieves the goals it has set for itself. In particular, according to the invention the rate of conditioning of the tablets in the cells is increased, for example by at least 20 to more than 40%.

The shape of channel grooves is typical of each type of unit to be packaged, be it long, oblong tablets, capsules or capsules, etc. These are so-called format parts, which are interchangeable in the same packaging machine. Similarly, the stroke adjustment bar of the upstream ramp is a part in the format, the realization of which depends on the width, the number and the distribution of the downstream channels in correspondence with the receiving cells in the moving strip. The coin hold tablet is also a coin format.

The invention has been described for a ramp with an inclined portion and a vertical portion. However, the invention is not limited to this type of ramp. It could also be a vibrating ramp slightly inclined and without change of inclination or low change of slope, the tablets being routed in the distribution channels mainly through vibration. It can also be a combined ramp comprising a horizontal vibrating ramp and a vertical non-vibrating ramp. And in the downstream ramp, the channels can be rectilinear rather than curved to end at an angle in the cells as shown in the diagram. figure 1 . In fact, it is clear that the invention is not limited to the modes of implementation which have been specifically described and represented, and that it extends on the contrary to any variant passing through equivalent means.

Claims (15)

1. Device for the channelled distribution of tablets into the cells of a travelling blister strip, into which cells they are individually deposited, said device comprising a first plurality of downstream channels arranged in a downstream ramp (2) for depositing tablets wherein said channels guide said tablets into the said cells, a second plurality of upstream channels arranged in an upstream ramp (1) for supplying tablets, in a layout such that at least two upstream channels are associated with each downstream channel, and means for bringing the said upstream channels into communication, in turn, with the corresponding channel belonging to the downstream ramp, characterised in that the bringing into communication is effected by a transverse displacement of the upstream ramp (1) with respect to the downstream ramp (2).
2. Device according to claim 1, wherein the upstream ramp is movable in a periodic movement which determines a repetitive cycle for changing over the connections between downstream channels and upstream channels, the number of the said upstream channels (31) arranged in the upstream ramp (1) being a multiple of the number of downstream channels (32) which the downstream ramp (2) comprises.
3. Device according to claim 1, wherein the number of upstream channels is double the number of downstream channels and the distance between the axes of the two upstream channels associated with the same downstream channel is the same from one downstream channel to another.
4. Device according to claim 3, wherein the upstream ramp (1) is movable in a periodic transverse swivelling movement from side to side alternately in order to line up each downstream channel in communication with each of the upstream channels which are associated with it alternately.
5. Device according to one of the preceding claims, comprising automatic means for periodically triggering movements of the upstream ramp (1) in transverse displacement in relation to the downstream ramp (2).
6. Device according to one of the preceding claims, comprising means for synchronising each displacement of the upstream ramp (2) in relation to the downstream ramp (1) with the absence of a tablet at the transition from an upstream channel to a downstream channel.
7. Device according to one of the preceding claims, comprising means for detecting, particularly by optoelectronic cells (5), the presence or otherwise of tablets at the entrance to the downstream channels (32) of the downstream ramp (2).
8. Device according to one of the preceding claims, comprising stop means (9) for stopping the flow of the tablets at the exit from the upstream channels (31) of the upstream ramp (1) by closing the upstream channels to their passage.
9. Device according to the preceding claim, wherein the said stop means (9) comprise a movable bar which carries elastic fingers (91) that are capable of penetrating, respectively, into the various channels of the upstream ramp.
10. Device according to claim 8 or 9, comprising means for automatically controlling the release of the stop means (9) at the end of the displacement of the upstream ramp and thus freeing the running of the tablets from the upstream ramp to the downstream ramp.
11. Device according to claim 10, wherein the said means for automatically controlling the stop means involve end-of-travel detectors for alternating transverse swivelling of the upstream ramp (1).
12. Machine for packaging tablets in the cells of a blister strip, characterised by the fact that said machine comprises a device according to one of the preceding claims for the channelled guidance of the tablets into the cells of the passing strip.
13. Method of implementing a channelled distribution device according to one of claims 1 to 12 in a machine for packaging tablets in a passing blister strip, according to which method the transverse swivelling of the upstream ramp (1) is controlled as a changeover of the connections between downstream channels and upstream channels in a periodic manner, by controlling the stopping of the routing of the tablets into the various upstream channels and by verifying the absence of tablets at the entrance to all the channels belonging to the downstream ramp (2) before allowing the displacement of the upstream ramp.
14. Method according to claim 13, according to which each changeover of the connections between upstream channels and downstream channels is triggered automatically after a predetermined time delay.
15. Method according to claim 13, according to which each changeover of the connections between upstream channels and downstream channels is triggered automatically on detecting a gap in filling in the channels of the downstream ramp.

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