FR2569260A1 - Method and device for manufacturing articles which are to undergo a heat treatment - Google Patents

Abstract

The method implements an installation of the type comprising an enclosure 1 in which a so-called annealing operation is performed, which takes place before packing of the objects. It is characterised in that the enclosure 1 is arranged vertically and in that the articles to be treated are firstly displaced in the ascending direction on the length 5 of a continuous conveyor then in the descending direction on the length 6 of the same conveyor. Heating is performed horizontally by convection by means of fans 7, electrical resistors 8 and registers 9 so as to create superimposed zones whose temperature increases from the bottom of the enclosure 1 to its upper portion.

Description

METHOD AND DEVICE FOR FASRICATION
OF ARTICLES TO BE SUBJECT TO HEAT TREATMENT
The present invention relates to an installation by which it is possible to obtain articles having undergone a heat treatment which have a high quality and which can be packaged under particularly favorable conditions.

Currently, certain products such as glass articles (bottles, flasks, etc.) or ceramic articles such as tiles with one side enamelled, give rise to a lot of waste which requires the presence of a workforce on site. work intended only for the verification and removal of defective items.

The imperfect treatments which lead to these rejects originate on the one hand, from the heat treatment itself and on the other hand, from transfers from a stock of loose articles to a packing station where the articles must have been stored and grouped.

These transfer operations are particularly aggressive for loraque articles, these are flat articles with decorated sides, such as tiles, because their packaging presupposes that they are bonded to a support sheet by their undecorated side, which must therefore be accessible, whereas beforehand the verification relates to their decorated face which is therefore, at this moment, the accessible face.

The solution offered by the present invention is to improve the articles upstream of the verification and packaging operations, so that these articles are more easily handled and have a constant quality.

 the heat treatment of articles such as glass or ceramic objects is currently done by means of a re-cooking arch which consists of a horizontal oven aorta of great length, of the order of 25 m, in which reign a temperature which must gradually increase to a maximum located at ml-length of the arch, then which must gradually decrease until the exit from the arch where the articles must have found a reasonable temperature.

It is therefore necessary to provide a heating over the entire length of the annealing oven and dissipate downstream part of the calories brought upstream, which causes a great waste of energy.

The re-cooking arch contains a continuous metal belt which moves in a loop and which rests on transverse cylinders to be guided.

 The articles are placed on the upper strand only, the lower strand being the return strand, inverted.

 Unfortunately, items that undergo heat treatment are generally heavy and the mat that carries them easily deforms between the different rollers, so that objects can fall if they are high or can deform, or even stick. to each other when they are flat and close.

To avoid deformation of the carpet, we have already thought of manufacturing it in a material that is both refractory so as not to be mice to variations due to changes in temperature and massive to deform as little as possible.

For this, a refractory steel braid is used which, without being perfect, gives satisfaction on the purely mechanical level but which, on the other hand, absorbs a lot of energy and in turn influences the articles being processed.

It is also noted that such a linear conveyor belt, moved in a loop along two horizontal strands, makes it impossible to change the orientation or even the direction of the articles which it carries on only one of its strands.

Furthermore, an annealing arch, because it is horizontal, is very sensitive to air currents which have the effect of shifting the heating zones by conduction.

To avoid this drawback, convection heating means are used using fans, but it is then very difficult to maintain clearly separated heating zones, so that the maintenance of a dimming of the heating, as well towards its increase that towards its decrease, is very difficult to obtain.

In addition, the hot current develops perpendicular to the plane of the carpet and therefore to the plane of the articles which it carries, which constitutes an attack which these articles support more or well. They often lead to the exit from the annealing arch, with certain deformations or real irregularities.

Finally, the opposite directions of movement of the two strands of the carpet, one of which is loaded with articles and the other not, cause still other disturbances of the interior atmosphere and, ultimately, the heat treatment may prove to be poor.

Indeed, at the exit of a re-cooking arch, articles such as decorated tiles are often so deformed and have a coloration or a decoration so heterogeneous due to the fact that the heat treatment is not well controlled, that it is necessary to sort by category and to adopt an "average" production of two to three days, which makes it necessary to build up intermediate stocks, before packaging.

To carry out the packaging, it is imperative to cause a forced tilting of flat articles such as tiles to have an orientation allowing the staff to observe their decorated side in order to remove the damaged articles and replace them with non-damaged articles. and similarly, operations which lead in practice to recycling approximately 50% of the articles and which represent approximately half of the total cost of the production of these articles.

Finally, after inspecting the articles by their upper face, it must be turned over to present their lower face to a sheet, or frame, of support on which they must be fixed.

All of the operations just described and the drawbacks they entail make it clear that the heat treatment and conditioning process are phases, certainly very different from each other by their design, but Which are intimately associated with each other to the point of constituting a global problem.

The present invention overcomes all the drawbacks mentioned above and makes it possible to give rise to articles of constant quality, using safe and more economical means than those which are currently used.

To this end, the subject of the invention is a process for the manufacture of articles to be subjected to a heat treatment, such as glass objects, ceramic tiles and the like, of the type using a fixed enclosure in which the articles are moved from an entry to an exit, characterized in that the enclosure is arranged vertically, that the internal atmosphere of the enclosure is heated, so that the temperature is established according to a gradient whose maximum is in the upper part and the mini-sua in the lower part of the enclosure, that the articles to be treated are penetrated into the enclosure, by an entry located at the lower part of said enclosure, which the objects are placed according to a loop course comprising first a vertical section ascending to the vicinity of the upper part of the enclosure, then a change of direction and finally, a vertical section descending to an exit which may be provided at nive at the entrance.

According to other characteristics of this process: - the articles are kept in a single orientation, despite the
change of direction; - the atmosphere of the enclosure is heated by convection and horizontal
lement; - in the case of flat articles having a decorated face, these articles
are treated face decorated at the top, and are thus brought from the
exit from the enclosure to a verification zone, then are
returned and packaged; - after having returned the articles, we constitute it in groups and we
fixes them to a support such as a sheet.

The invention also relates to a device for implementing the above process, characterized in that it comprises a vertical enclosure provided with a lower lateral entry and containing an ascending conveyor from the entry to the upper part of the enclosure and a descending conveyor from the upper part of the enclosure to an outlet, as well as transfer members from the ascending conveyor to the descending conveyor, this enclosure being associated with heating means.

According to other characteristics of this device - it includes two horizontal conveyors outside the enclosure,
which are located opposite the entrance and exit respectively
and which are combined with internal transporters within the enclosure for
that items can pass from an outside carrier to
ascending interior carrier and interior carrier
descending to the other external transporter, without changing its orion
tation; - the ascending transporter and the descending transporter are two
strands of a single continuous carrier closes in on itself and
return bodies are either combined or substituted for
transfer, - the transporter comprises swings and return members; - the transporters inside the enclosure are two linear sections -
monodirectional areas and have removable plates installed
on supports, the transfer devices from a transporter to
the other comprising means for translating parallel to it
even that of the ascending carrier plates located on the sup
ports of the highest level up to the contributions of the highest level
high of the downward carrier; - the transporter outside the enclosure located opposite the exit
is associated with an article transfer mechanism, from the end
from this transporter to another transporter, this mechanism
being of the flipping type so that the face of these articles which
was above before their transfer, or below after their
transfer.

The invention will be better understood from the detailed description cl-aprXs made with reference to the appended drawing. Of course, the description and the drawing are given only by way of an indicative and nonlimiting example.

Figures 1 and 2 are schematic views, respectively in vertical section and in horizontal section of a device according to the invention.

Figure 3 is a partial schematic sectional view of a vertical enclosure according to the device of the invention.

Figures 4 and 5 are partial schematic perspective views with cutaway showing two variants of an embodiment of the invention which provides for the separation of the different heating zones of the enclosure by plates.

Referring to the drawing, it can be seen that an installation in accordance with the invention comprises a vertical enclosure 1 thermally insulated, having a lower inlet 2 and an outlet 3 which, here, is located at the same level as the inlet 2 but which, in practice, may be located at another level depending on the conditions prevailing inside the enclosure 1 and the characteristics of the articles treated.

Inside the enclosure 1 is placed a chimney 4 in which there is a conveyor having an ascending strand s and a descending strand 6, convection heating means being symbolized by fans 7 associated with resistors 8 and has inlet and outlet registers 9a and outlet 9b in a chimney 4. In FIG. 1, the registers are represented as being simple openings but it goes without saying that these registers can be formed by slots with deflectors, holes etc.

The purpose of this arrangement is to determine superimposed heating zones, possibly materialized by partitions, as will be described later.

The conveyor 5-6 is shown here in the form of a variant of the invention according to which this conveyor has linear strands, respectively ascending 5 and descending 6 and comprises guide and displacement means of any known type, comprising supports 10 on which rest removable horizontal plates 11.

At the upper part of the enclosure l, there are provided organs of any known type, symbolized by a slide 12 and a jack 13 which automatically translate the plate 11 located at the highest level of the strand 5, up to highest level of the strand 6, according to arrow Fl. Thus, a very small spacing of the superimposed plates 11 can be provided since they do not cross an arc to pass from the ascending strand 5 to the descending strand 6.

At the lower part of the enclosure 1, there are return members constituted by an assembly shown here by a pulley 14 for the strands 5 and 6, which do not include, below the level of the inlet 2 and the outlet 3 , as supports 10, without plates 11. We see that here, the return members 14 of the strands 5 and 6 of the transporter are combined with the members 12-13 for transferring the plates 11.

Opposite entrance 2 is the upper strand of a conveyor of any known type 15 which is moved in the direction of arrow F2, that is to say towards entrance 2. A tunnel 16, for the electrostatic installation of a coating on the articles, is provided above the conveyor 15.

Next to the outlet 3, there is a roller conveyor 17, for the evacuation of the plates 11 and of the articles, according to the arrow F3, cr "-e will be explained below.

With the arrangements which have just been described, articles placed on plates 11 terminate by the conveyor 15 at the entrance 2 and this conveyor 15 is combined and coordinated with the ascending strand 5 so that the articles can pass, without changing the orientation, from the conveyor 15 to the ascending strand 5.

The mechanical operation of these different conveyors is not described in detail here, because it is within the reach of a ho @@@ of the trade and only implements organs and components of any known type.

The group of articles which is on a given plate 11, rises progressively from the level of entry 2 to the upper part * - upper of enclosure 1 and thus penetrates, zone by zone, in an atmosphere of more and more hot, because it was made so that the internal temperature of the inciente 1 is established according to a gradient having its maximum at its upper part. The heat treatment which is applied to these articles is therefore gradual and can be all the better controlled as the heating means 7 - 8 are of the connection type.

It is also noted that the flow of hot air develops horizontally, that is to say parallel to the plane of the plates 11 on which the articles are placed, which represents much more favorable conditions than those which are currently adopted in the installations of re-cooking known and which provide a flow of hot air perpendicular to the plane of the mat on which the articles rest.

When the plate 11 considered is at the level of the transfer means 12 - 13, it undergoes a change of direction since its vertical path becomes horizontal until it has reached the highest level of the descending strand 6 which will '' progressively lower to the level of exit 3 by making it pass, zone by zone, an atmosphere less and less hot.

It is noted that the transfort from strand 5 to strand 6 has the consequence of leaving the plate 11 and the articles which it carries at the same level. We take advantage of this circumstance to adapt exactly the highest temperature prevailing in the enclosure to the nature of the articles, so that they undergo, precisely, strong heating for an exact time before entering the cycle of lowering of temperature.

To this end, a heating element is provided, such as an electrical resistance (not shown) at the top of the chimney 4 so that it acts exclusively on the upper face of the articles, relatively intensely, but for a short time. just necessary for the transfer of the plates li from strand 5 to strand 6, which has an effect on the top of the articles, in the manner of a grill, and not in all their oanee.

This procedure is particularly favorable for obtaining varnished articles, of good and constant quality.

When the plate 11 considered reaches the level of the outlet 3, it is translated on the conveyor 17 while the supports 10 continue their journey to the lower pulley 14 in order to go up according to the ascending strand 6 so that the cycle of the conveyor closes in a loop.

The articles have a certain orientation on the conveyor 15 and they keep this orientation until the conveyor 17, so that no reversal and no sudden movement occurs and do not risk having consequences on the articles treated.

in the case of faience tiles, they are treated with the decorated side up, so that it is free and suitably undergoes the heat treatment which is best suited to it.

The transporter 17 is associated with a mecaname ensuring it both the transfer of the articles and their return.

Thus, immediately at the exit of enclosure 1, the personnel can exercise their inspection of the articles which appear face decorated above to possibly remove those which present imperfections.

 not so, the articles which are returned by the mecanism the ot which we can no longer directly observe the upper face, are perfect and can immediately, without creation of intermediate stock, give rise to the packaging operations which will now be described .

 heap of articles seized by the suction cups 21 on the conveyor 17 are returned due to the pivoting of the shaft 19 and are released as soon as they have reached an inclined slide 22 which obliges them to be placed, without any shock, on the trays of storage 23 placed on a conveyor 24 of any known type.

The slide 22 has openings 25 through which the arms 20 and the suction cups 21 can pass to be located below the slide 22, it is seen not to hinder the movement of the articles to the trays 23. As soon as the articles have leaves the slide 22, the axis 19 is driven on pivoting in the opposite direction to bring the suction cups 21 over a new batch of articles, these successive operations reproducing cyclically.

this procedure is particularly favorable for obtaining glazed articles of good and constant quality.

when the plate 11 considered reaches the level of the outlet 3, it is translated on the conveyor 17 while the supports 10 continue their journey to the lower pulley 14 in order to go up according to the ascending strand 6 so that the cycle of the conveyor ferrets in a loop.

The articles have a certain orientation on the conveyor 15 and they keep this orientation until the conveyor 17, so that none returned and no sudden movement occurs and is not likely to have consequences for the articles treated.

If it is earthenware tiles, they are treated with the decorated side up, so that it is. free and undergoes the heat treatment which is best suited to it.

The conveyor 17 is associated with a mechanism 18 ensuring both the transfer of the articles and their reversal. Thus, immediately at the exit of enclosure 1, the personnel can exercise their inspection of the articles which appear face decorated above in order to possibly remove those which present imperfections.

In this way, the articles which are returned by the mechanism 18 and which can no longer be observed directly on the upper face, are perfect and can immediately, without creating an intermediate stock, give rise to the operations of conditioning that we will describe now.

The mechanism 18 is advantageously of the type comprising a central horizontal pivot 19, arms 20 and suction cups 21 in which there is alternately a vacuum to cause adhesion of the articles to the arms 20 and a pressure to release the articlcs, this vacuum cycle pressure being obtained by means well known to those skilled in the art and which are not described here.

The articles seized by the suction cups 21 on the conveyor 17 are turned over due to the pivoting of the shaft 19 and are released as soon as they have reached an inclined slide 22 which forces them to be placed, without any shock, on trays of storage 23 poses on a conveyor 24 of any known type.

The slide 22 has openings 25 through which the arms 20 and the suction cups 21 can pass to be located below the slide 22, so as not to hinder the movement of articles zus- that trays 23. As soon as the articles have left the slide 22, the axis 19 is pivotally driven in the opposite direction to bring the suction cups 21 over a new batch of articles, these successive operations reproducing cyclically.

This gives the grouping of articles on the trays 23, decorated side below.

Above the conveyor 24 there is one or more coils 26 for a flexible support 27 such as paper or synthetic material, support 27 which is applied by a pressure roller 28 to the upper face of the articles, this that is to say on their undecorated face, which has received an adhesive contained in a tray 29, by means of an applicator roller 30.

The support 27 is then cut transversely (and optionally longitudinally when there is only one reel 26 for several juxtaposed batches) and here, there is shown schematically a transverse web 31 which occurs after staging of the adhesive in a tunnel 32.

At the exit from the conveyor 24, individual batches have thus been formed, grouping a number of articles of varying size, in particular according to their dimensions, and in the case batches are placed in containers such as cardboard boxes 33 located, for example, on a roller conveyor (not shown).

The plates 11 and the plates 23 are recycled according to a loop path i
Next to the conveyor between 15, there is a conveyor 40 which receives, by any means known per se, articles to be annealed. Upstream of the place where these articles are deposited, arrive one after the other plates 11 which have just left the tunnel 16 and which have just unloaded from the articles which they were carrying. In a device 41 known per se, they are brushed or otherwise cleaned of the coating which they received in the tunnel 16 at the same time as the articles.

The plates 11 loaded after the device 41 are moved according to arrow F4 to the end of the conveyor 40 or they are translated on the conveyor 15 according to the arrow FS. After appearing according to arrow F2, they return to the transporter 40 according to arrow P6.

Next to the outlet conveyor 17, there is a conveyor 50 on which the plates 11 are translated according to floche F7 as soon as they have been discharged from the articles by the suction cups 21 of the mechanism 18.

They run through the conveyor 50 according to arrow F8 then they are translated according to arrow F9 downstream of the input conveyor 15. At this location, they receive by horizontal translation, without change of orientation, the articles which are discharged, by a mechanism of known type 51, plates 11 to return to the conveyor 40. They are then placed on the supports 10 of the ascending strand 5 and so on.

The use of rigid plates 11, for example of 125 X 430 mm, guarantees that the articles will rest on them without undergoing parasitic movements, because such plates are practically undeformable.

According to the dimensions of these plates 11, it is possible to place articles of different dimensions in variable number such as, for example, four tiles of 100 X 100 mm or six tiles of 75 X 75 mu or eight tiles of 50 X 50 mm on plates of 170 X 800 n.

In practice, an enclosure 1 can contain four hundred plates which give each article a passage time in enclosure 1 which can be of the order of 25 to 40 minutes.

 As can be seen from the description above, it is possible to determine heating zones by simple superimposition of heating resistors 8 and fans 7 arranged in front of registers 9.

But it is also possible to compartmentalize the space between the enclosure 1 proper and the chimney 4 by plates which separate the different stepped areas.

In Figure 4, there is schematically shown a plate 60 to separate two superimposed zones 61 and 62 each having its own heating means (not shown) to make prevail a temperature in the upper zone 61 higher than in the zone from below 62. Note that the plate 60 is oblique and not perpendicular to the axis of the enclosure 1.

Naturally, the perpendicular plates could be provided and, in this case, there is absolute symmetry between the increase in temperature which the articles of the ascending strand 5 undergo and the decrease in temperature which the articles of the descending strand 6 undergo.

By providing for the obliquity of the plates, a temperature difference is created between the strands 5 and 6 because the hot air which is introduced into the chimney 4 through the inlet register 9a (arrows P10) on the side of the strand 5, exits by the register 9b located below (arrows F11) on the side of the strand 6, so that the ascending strand 5 is at a temperature T1 at a given level, while the descending strand 6 is at the same temperature T1 at a lower level to the previous one. The larger the angle of obliquity (possibly adjustable) of the plates, the greater the temperature shift.

Experience shows that it may be sufficient to provide plates 70 (FIG. 5) over the entire interior length of the enclosure 1 proper but not over its entire width because the air current acquires a looping movement. by the only combination of the oblique alignment of the registers 9a - 9b and the plates 70, without appreciable vertical deviation.

The adoption of plates 11 is particularly suitable for flat articles such as ceramic tiles @. The total height of each plate 11 and of the flat articles which it carries is relatively small, hence the interest of the solution which consists in transferring the plates 11 in a straight line from the ascending strand 5 to the descending strand 6 by the mechanism 12-13.

Maix, when the articles to be treated are relatively high, which is the case for glass bottles for example, we are obliged to provide a much greater spacing between two successive plates 11, so that the best solution for effecting the change of direction between the ascending strand 5 and the descending strand 6 is no longer to provide linear translating mechanisms 12 13 but to replace them more simply curved return members. In this case, the ascending strand and the descending strand are closed on themselves, including in the upper part of enclosure 1, but since it is desired that the articles, while changing direction, never change orientation , the plates 11 must then be added to swings or constitute a part of swings receiving the articles to be treated.

Balanc @ lles transporters are themselves well known and we will not describe them in more detail, just remembering that with this system the direction changes from bottom to top then laterally. then from top to bottom, then finally from lateral return are made in a closed loop, the swing supports remaining constantly horizontal.

Thanks to the invention, products are obtained which have excellent dimensional qualities and a good surface finish, which considerably simplifies checks and reduces the causes of rejects to simple accidents which are by their nature much rarer than defects due to defects. of the manufacturing process.

It is also possible to obtain immediate return of the articles as soon as they leave enclosure 1, blanks having to build up intermediate stock.

The return of the articles by an individual suction mechanis @@ makes it possible to position each of the articles, individually, in storage boxes for the trays 23 or in row lanes, with very high security and without annual intervention.

As is known, it is possible to fix the articles to a support intended to be removed, such as paper or a sheet of synthetic material, or else to use a fusible support at low temperature, thanks to which by means of an applicator one can fix the articles on the wall for which it is intended, as is known per se.

The vertical arrangement of the enclosure 1 and the alternating two-way circulation of the articles make it possible to reduce the height of the enclosure by half compared to what would be the length of a known type annealing arch that crosses two faiths. each area. The size of the installation is therefore considerably reduced.

when the products to be treated are of the flat, Corsican type of tiles, an installation which is comfortable with the invention is particularly perforated
Pante. Indeed, the larger the tiles, the more horizontal surface they occupy when they are juxtaposed, which is an important drawback for known re-baking arches, since they are horizontal, not for an enclosure according to the invention.

By it, to treat tiles of 10 ce X 10 cm with a production of one tile per second, ensuring a heat treatment do 30 minutes, the tiles are placed at the rate of four on plates of 12.5 Cl X 43 cm. This width corresponds to a useful width commonly used for current re-cooking arches.

We therefore load a plate of four tiles every four seconds.

For a passage time in the arch of 30 minutes, or 1,800 seconds, this known type arch must have a useful length of
12.5 X 1,800 = 56.25 meters.

4
To respect the same parameters as above, an enclosure which is comfortable with the invention would have a height which would only be t
5.625 meters because the same plates carrying the same tiles have only 2.5 Cl (vertical) spacing instead of 12.5 Cl (horizontally), which means that we set five plates where we cannot currently only put one, hence a ratio of 1/5.

In addition, the route in accordance with the invention providing for an outward (ascending) and a return (descending) in the enclosure, the latter is twice as low as an arch is long, as we say above.

Hence a ratio of 1/2 which, combined with the previous one of 1/5, gives a speaker height equal to 1/10 of the length of a known arch.

In addition, this provides significant energy savings because, to the advantage of the reduced dimensions, is added the fact that energy is transferred from the place of cooling (d-increasing temperature curve) to the place of heating (increasing temperature curve) and it only remains to compensate for the thermal losses of the walls.

Finally, by providing input 2 at a level different from that of output 3 and / or by using oblique separations 60 - 70 between the zones, it is possible to effectively modulate the increasing and decreasing temperature curves and, therefore, adapt the same installation to the requirements of different articles.

Claims (9)

R E V E N D I C A T I O N S 1- Method of manufacturing articles to undergo ther treatment  mique, such as glass objects, ceramic tiles and  analogues, of the type using a fixed enclosure (1) in  which items are moved from an entry (2) to  an outlet (3), characterized in that the enclosure (1) is arranged  vertically, that the internal atmosphere is heated by 1 '  girdle, so that the temperature is established according to a  gradient the maximum of which is in the upper part and the  minimum in the lower part of the enclosure (1), which is  penetrate the articles to be treated into the enclosure (1), by a  inlet (2) located at the bottom of said enclosure (1),  that we move the objects along a loop path comprising  first an ascending vertical section (5) to the vicinity of the  upper part of the enclosure (1), then a change in direction  tion and finally, a vertical section descending (6) to a exit  tie (3) which can be provided at the entrance (2). 2- Method according to claim 1, characterized in that one hand  holds items in one orientation, despite changing  feels direction. 3- Method according to claim 1, characterized in that one  heats the atmosphere of the enclosure (1) by convection and horizonta  lement.  4 Method according to claim 1, characterized in that in the  in the case of flat articles with a decorated side, these articles are  treated face decorated at the top and then are brought in from the  outlet (3) from the enclosure (1) to a verification zone,  then returned and packaged; 5- Method according to claim 4, characterized in that after having  returned the articles, we constitute them in groups and we fix them  å a support (27) such as a sheet. 6- Device for implementing the above process, character-  laughed in that it comprises a vertical enclosure (1) provided with a  between lower side (2) and containing an ascen conveyor  dant (5) from the entrance (2) to the upper part of  the enclosure (1) and a descending conveyor (6) from the part  upper enclosure (1) to an outlet (3), as well as  transfer members (12-13) from the ascending conveyor (5) to  descending conveyor (6), this enclosure (1) being associated with  heating means (7-8-9). 7- Device according to claim 6, characterized in that it com  takes two horizontal conveyors (15 and 17) outside the  girdle (1), which are located opposite respectively the land  (2) and sortio (3) and which are combined with the transportours (5  and 6) inside the enclosure (1) so that articles can  switching from an external transporter (15) to the internal transporter  ascending (5) and the descending internal transporter (6) to  the other external transporter (17), without changing orientation. 8- Device according to claim 6, characterized in that the  ascending transporter (5) and descending transporter (6) are  two strands of a single continuous conveyor closed on itself and  return members (14) are either combined or substituted for  transfer devices (12-13). 9- Device according to claim 8, characterized in that the  conveyor comprises swings and return members. 10- Device according to claim 8, characterized in that the  carriers (5 and 6) inside the enclosure (1) are two  monodirectional linear sections and have plates  removable (11) placed on supports (10), the trans  fert (12-13) from one transporter (5) to another (6) comprising  means for translating parallel to itself sticks plates  (11) of the ascent conveyor (5) located on the supports (10) of the  highest level up to supports (10) of the highest level  high of the descending conveyor (6). 11- Device according to claim 6, characterized in that the  transporter (17) outside the enc @ inte (1) located opposite the  outlet (3) is associated with a mechanism (18) for transferring articles  from the end of this transport to another transport  tor (24), this mechanism (18) being of the reversal type so that  the face of these items which was above before their transfer,  either below after their transfer.