FR2564525A1

FR2564525A1 - Metering pump for pasty products or products filled with fragile substances

Info

Publication number: FR2564525A1
Application number: FR8408186A
Authority: FR
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-05-21
Filing date: 1984-05-21
Publication date: 1985-11-22
Anticipated expiration: 2004-05-21
Also published as: FR2564525B1

Abstract

Device for automatically metering and dispensing pasty products or liquids filled with fragile products. The invention comprises the one cylinder 1 open at both ends in which there freely slide two pistons 2 and 3, the said pistons, which by themselves close and open the intake and delivery ports 9 and 11, are moved individually by the actuators 4 and 5 which are pneumatically powered in a logical process of which the phases are controlled by the end-of-stroke contacts encountered, in the course of the movements of the said pistons, by the fingers 6 and 7 with which the exterior faces of the pistons 2 and 3 are provided, the position of these contacts being adjustable in order to adjust the volume of material taken in and the compression ratio to which the material is subjected.

Description

POMPE DOSEUSE POUR PRODUITS PATEUX OU CHARGES DE
SUBSTANCES FRAGILES.DOSING PUMP FOR PASTY PRODUCTS OR LOADS OF
FRAGILE SUBSTANCES.

Il existe differents types de pompes doseuses utilisées pour distribuer automatiquement des produits liquides ou pâteux dans des recipients successivement présentes sous la machine. Celles-ci font appel generalement à une vanne rotative oscillante situee a la base de la réserve de produit et qui met alternativement le piston distributeur en relation avec ladite réserve dans la phase d'aspiration puis avec le circuit de refoulement dans la phase de compression. There are different types of dosing pumps used to automatically distribute liquid or pasty products in containers successively present under the machine. These generally use a rotary oscillating valve located at the base of the reserve of product and which alternately puts the distributor piston in relation with said reserve in the suction phase and then with the discharge circuit in the compression phase.

De tels dispositifs presentent l'inconvénient de ne pas permettre un dosage précis par suite de la difficulté de régler les éléments mécaniques qui commandent la course du piston. De plus, le mouvement de la vanne rotative entraine la detérioration des produits fragiles qui sont en suspension dans les liquides véhiculés, et sa fonction se prête mal au transfert de produits pâteux. Such devices have the drawback of not allowing precise dosing due to the difficulty of adjusting the mechanical elements which control the stroke of the piston. In addition, the movement of the rotary valve causes the deterioration of fragile products which are suspended in the transported liquids, and its function lends itself poorly to the transfer of pasty products.

Le dispositif objet de la présente invention permet d'éviter ces inconvénients, en même temps qu'il permet une construction simple. Il ne comporte en effet aucun clapet ni soupape, ce qui conduit a un matériel peu onéreux, facile a entretenir. Du fait de sa simplicité, son réglage est aussi très facilement obtenu ne nécessitant que le déplacement de contacts fin de course. Et le réglage simple permet de régler aussi bien le volume de la chambre d'aspiration que le taux de compression, de façon séparée ou simultanée, ce qui permet de régler le débit du produit véhiculé aussi bien que la pression a laquelle il est soumis, autorisant ainsi le transfert de produit fragile tels que les conserves de légumes ou de fruits. The device which is the subject of the present invention makes it possible to avoid these drawbacks, at the same time as it allows simple construction. It does not in fact include any flap or valve, which leads to inexpensive equipment which is easy to maintain. Because of its simplicity, its adjustment is also very easily obtained requiring only the displacement of limit switch contacts. And the simple adjustment makes it possible to adjust both the volume of the suction chamber and the compression ratio, separately or simultaneously, which makes it possible to adjust the flow rate of the product conveyed as well as the pressure to which it is subjected, thus authorizing the transfer of fragile products such as canned vegetables or fruit.

Pour cela, deux pistons sont montés dans un même cylindre et peuvent se déplacer selon un cycle déterminé par le jeu de contacts fin de course manoeuvrés par les pistons eux-memes a la fin de chaque phase, ce qui les amène à se déplacer, ou bien indépendamment l'un de l'autre de manière a s'éloigner et se rapprocher alternativement l'un de l'autre afin de créer l'effet d'aspiration et de refoulement, ou bien simultanément afin de déplacer dans le cylindre, sans variation de volume, le produit aspiré depuis l'orifice d'aspiration jusqu'a l'orifice de refoulement du système, les pistons jouant aussi, au cours de leurs déplacements, le roule d'obturateurs des orifices d'aspiration et de refoulement. For this, two pistons are mounted in the same cylinder and can move according to a cycle determined by the set of limit switch contacts operated by the pistons themselves at the end of each phase, which causes them to move, or well independently of each other so as to move away and approach alternately one from the other in order to create the suction and discharge effect, or else simultaneously in order to move in the cylinder, without variation in volume, the product sucked from the suction port to the system discharge port, the pistons also playing, during their movements, the rolls of shutters of the suction and discharge ports.

Un tel dispositif, par suite -de son absence de clapet ou de soupape est facile a construire et a entretenir. Par suite aussi de l'absence de ces organes il peut etre utilise pour le transfert et le dosage des produits pateux utilises en pâtisserie, et la possibilité qu'il offre de regler le volume de la chambre d'aspiration et son taux de compression le rend particulièrement utile pour le transfert, avec dosage, des produits fragiles en suspension dans un liquide tels que les fruits, légumes ou champignons en conserve. Such a device, as a result of its absence of a flap or valve, is easy to build and to maintain. As a result also of the absence of these organs it can be used for the transfer and dosage of pasty products used in pastry, and the possibility that it offers to adjust the volume of the suction chamber and its compression ratio. makes it particularly useful for the transfer, with dosage, of fragile products suspended in a liquid such as canned fruits, vegetables or mushrooms.

Les dessins annexés, donnés a titre d'exemple- seulement, montrent un mode de réalisation du dispositif objet de l'invention. The accompanying drawings, given by way of example only, show an embodiment of the device which is the subject of the invention.

La figure 1 est une vue schématique en coupe partielle, longitudinale, diamétrale, du dispositif objet de l'invention en position de fin de compression. Figure 1 is a schematic view in partial section, longitudinal, diametral, of the device object of the invention in the end of compression position.

La figure 2 est une vue schématique en coupe partielle, diamétrale du même dispositif en position de début d'aspiration. Figure 2 is a schematic view in partial, diametral section of the same device in the start suction position.

La figure 3 est une vue schématique en coupe partielle, diamétrale du même dispositif en position de fin d'aspiration. Figure 3 is a schematic partial sectional view, diametrical of the same device in the end of suction position.

La figure 4 est une vue schématique en coupe partielle, diamétrale du même dispositif en position de début de compression. Figure 4 is a schematic partial sectional view, diametrical of the same device in the compression start position.

Les figures 5, 6, 7 et 8 sont les vues schématiques en coupe partielle, diamétrale montrant les mêmes phases successives selon un autre mode de réalisation. Figures 5, 6, 7 and 8 are schematic views in partial, diametral section showing the same successive phases according to another embodiment.

Tel qu'il est représenté, (fig. I) le dispositif comporte le cylindre métallique I ouvert de part et d'autre, contenant les deux pistons 2 et 3 montés en série, chacun étant manoeuvre respctivement indépendamment l'un de l'autre par les vérins extérieurs 4 et 5, par l'intermédiaire des bras 6 et 7. As shown, (fig. I) the device comprises the metal cylinder I open on either side, containing the two pistons 2 and 3 mounted in series, each being operated respectively independently of one another by the external cylinders 4 and 5, by means of the arms 6 and 7.

Un bac 8 de stockage du produit a véhiculer est adapté directement à l'orifice 9 d'aspiration. Une tubulure 10 d'évacuation du produit est adaptée directement à l'orifice 11 de refoulement. A tank 8 for storing the product to be conveyed is adapted directly to the suction orifice 9. A tubing 10 for discharging the product is adapted directly to the outlet port 11.

Le dispositif étant ainsi constitué, les pistons 2 et 3 positionnes selon la figure 1 se trouvent en fin du cycle de compression, chacun des pistons 2 et 3 ayant sa face intérieure au contact de l'autre et ensemble
au niveau de la position extreme de l'orifice de refoulement 11. Dans cette
position l'orifice 9 d'aspiration, qui communique librement avec le cylindre
I est totalement obturée par le corps du piston 2 ainsi que l'orifice 11 de refoulement.The device being thus constituted, the pistons 2 and 3 positioned according to FIG. 1 are at the end of the compression cycle, each of the pistons 2 and 3 having its inner face in contact with the other and together
at the extreme position of the discharge port 11. In this
position the suction port 9, which communicates freely with the cylinder
I is completely closed by the body of the piston 2 as well as the outlet port 11.

Le piston 2 est commandé par la tige 12 qui traverse, à frottement doux et de façon étanche, le piston 3 selon son axe, ceci ayant pour avantage d'assurer un parfait guidage concentrique de chacun desdits pistons dans le cylindre I lorsque < ' < 's pistons sont dans leur position la plus proche de chaque extrémité du cylindre 1 (fig. 3 et 4). The piston 2 is controlled by the rod 12 which passes, with gentle friction and in a sealed manner, the piston 3 along its axis, this having the advantage of ensuring perfect concentric guiding of each of said pistons in the cylinder I when <'< 's pistons are in their position closest to each end of cylinder 1 (figs. 3 and 4).

Done, < lîns cette position de la figure 1, les deux orifices 10 et 11 sont obturés par le piston 2. Done, <lîns this position of figure 1, the two orifices 10 and 11 are closed by the piston 2.

Sous l'action de chacun des vérins pneumatiques 4 et 5, autorisée uli un palpeur, non représenté. qui contrôle le passage des récipients a rem- plir qui défilent sur la machine lilullie d'une telle pompe, les deux pistons 2 < 't 3, clui se trouvent dans la position initiale de la figure 1, se déplacent d'abord simultanément en parfait synchronisme, jusqu'à ce que leurs deux faces intérieures accolées atteignent l'extrémité la plus extérieure de l'orifice d'asplration @ que le piston :3 vieiit obturer totalement (fig. 2).A cet instant, 1 < ' bras 7 situé à l'arrière du piston 3 atteint le contact 13 qui provoque l'arrêt du vérin 4, donc du piston 2, et inverse la pression dans le vérin 5, ce qui permet au piston 3 de revenir vers sa position d'origine, provoquant le développement de la chambre d'aspiration 14 jusqu'a une distance du bord imérieur de l'orifice de refoulement 11 toujours supérieure au diamètre dudit orifice qui reste encore obture par le piston 3 (fig. 3). Under the action of each of the pneumatic cylinders 4 and 5, authorized uli a probe, not shown. which controls the passage of the containers to be filled which parade on the lilullie machine of such a pump, the two pistons 2 <'t 3, which are in the initial position of figure 1, move first simultaneously in perfect synchronism, until their two adjoining inner faces reach the outermost end of the suction opening @ that the piston: 3 vieiit completely seal (fig. 2). At this time, 1 <'arm 7 located at the rear of the piston 3 reaches the contact 13 which causes the stop of the jack 4, therefore of the piston 2, and reverses the pressure in the jack 5, which allows the piston 3 to return to its original position , causing the development of the suction chamber 14 up to a distance from the inner edge of the discharge orifice 11 always greater than the diameter of said orifice which remains still closed by the piston 3 (fig. 3).

Le bris 7, qui commande le piston 3 et qui porte sur la barre 17, solidaire de lui et parallèle à l'axe des pistons. le curseur réglable 20 manoeuvrant alors le contact 15 (fig. 3), les deux vérins 4 et 5 sont aussitôt nus en mouvement simultanément de manière que le piston 2 vienne obturer totaiement l'orifice d'aspiration 9 avant que le piston 3 découvre totalement l'orifice de refoulement 11. (ce qui est atteint sur la fig. 4). Pendant ce monvement simultané des deux pistons 2 et 3. qui s'effectue en parfait synchronisme. le volume de la chambre 14. qui se déplce, reste constant. The break 7, which controls the piston 3 and which bears on the bar 17, integral with it and parallel to the axis of the pistons. the adjustable cursor 20 then operating the contact 15 (fig. 3), the two jacks 4 and 5 are immediately in motion simultaneously so that the piston 2 comes to completely close the suction port 9 before the piston 3 fully discovers the discharge orifice 11. (which is reached in fig. 4). During this simultaneous raising of the two pistons 2 and 3. which takes place in perfect synchronism. the volume of chamber 14. which moves, remains constant.

Dans cette position où l'orifice de refoulement 11 est totalement ouvert. le bras 7 atteignant le contact 30. le piston 3 s'arr@te, alors que le piston 2 contimue sa course, ce qui provoque la compression de la chambre
14 précédemment créée. chassant le produit qu'elle contient dans la conduite
d'évacuation 10, le mouvement du piston 2 s'arrêtant lorsque la face extétieure de ce piston munie du bras 19 atteint le contact fin de course 16. In this position where the discharge orifice 11 is completely open. the arm 7 reaching the contact 30. the piston 3 stops @ while the piston 2 continues its stroke, which causes the compression of the chamber
14 previously created. chasing the product it contains in the pipe
discharge 10, the movement of the piston 2 stopping when the outer face of this piston provided with the arm 19 reaches the limit switch contact 16.

ce qui provoque le renouvellement du cycle ci-dessus décrit.which causes the renewal of the cycle described above.

On remarque que le curseur 20 est réglable sur le barre 17 de manière à régler le volume de la chambre 14, donc le volume de produit aspiré, et le contact 16 est réglable sur le bras 18 parallèle à l'axe des pistons de manière à régler le taux de compression au refoulement en réglant la course du piston 2. Note that the cursor 20 is adjustable on the bar 17 so as to adjust the volume of the chamber 14, therefore the volume of product sucked in, and the contact 16 is adjustable on the arm 18 parallel to the axis of the pistons so as to adjust the compression ratio on delivery by adjusting the stroke of the piston 2.

On comprend donc que le dispositif étant ainsi constitué et le bac 8 étant rempli d'un produit pâteux, ou liquide chargé de corps fragiles tels que des fruits, des légumes ou des champignons, ce produit est aspiré dans la chambre 14 lorsque celle-ci se développe alors qu'elle communique avec le bac 8 à travers l'orifice d'aspiration 9 (fig. 3). It is therefore understood that the device being thus constituted and the tank 8 being filled with a pasty product, or liquid loaded with fragile bodies such as fruits, vegetables or mushrooms, this product is sucked into chamber 14 when the latter develops as it communicates with the tank 8 through the suction orifice 9 (fig. 3).

Cette chambre 14 subissant alors la translation notée sur la figure 4, elle ne sera plus en communication avec le bac 8, I'orifice d'aspiration 9 ayant été préalablement obturée par le piston 2, mais elle sera en communication avec la tubulure 10 d'évacuation à travers l'orifice de refoulement
11 qui a été dégagé par le piston 3.This chamber 14 then undergoing the translation noted in Figure 4, it will no longer be in communication with the tank 8, the suction port 9 having been previously closed by the piston 2, but it will be in communication with the tubing 10 d discharge through the discharge opening
11 which has been released by the piston 3.

On notera que durant cette translation, cette chambre 14 etant maintenue à volume constant, il ne se produit aucun refoulement vers le bac 8, même durant le temps ou l'orifice d'aspiration 9 est encore partiellement ouverte, ce qui permet de supprimer tout clapet. Note that during this translation, this chamber 14 being maintained at constant volume, there is no backflow towards the tank 8, even during the time when the suction orifice 9 is still partially open, which makes it possible to remove all valve.

Cette même chambre 14 est, au contraire, soumise a la compression provoquée par le déplacement du piston 2 lorsque le piston 3 s'est arrêté
à ltextrémité la plus extérieure de l'orifice 11, ce qui provoque le refoulement du produit à travers la conduite 10 (fig. 4).This same chamber 14 is, on the contrary, subjected to the compression caused by the displacement of the piston 2 when the piston 3 has stopped
at the outermost end of the orifice 11, which causes the product to be forced back through the line 10 (fig. 4).

Et le cycle recommencera automatiquement, comme cela a été
decrit ci-dessus, sous le contrôle des contacts fin de course 13, 15 et 16,
pour autant, cependant, que le palpeur, non représente, qui contrôle le passage
des recipients à remplir, l'autorise.And the cycle will start again automatically, as it was
described above, under the control of the limit switch contacts 13, 15 and 16,
provided, however, that the probe, not representing, which controls the passage
containers to fill, authorizes it.

Le cycle étant ainsi organisé, la pompe ainsi constituée acheminera
au cours de chaque cycle une quantité constante de produit. Et on constate
qu'elle est particulierement simple dans sa construction, puisqu'elle ne com
porte aucun clapet (ce qui permet aussi le transfert de produits Fragiles
et facilite son entretien), ni aucun mouvement rotatif. The cycle being thus organized, the pump thus constituted will route
during each cycle a constant amount of product. And we see
that it is particularly simple in its construction, since it does not com
door no valve (which also allows the transfer of Fragile products
and facilitates its maintenance), nor any rotary movement.

De plus, le volume constant de produit véhiculé au cours de chaque cycle peut être aisément modifie, ce qui fait de cette pompe une pompe doseuse, le reglage du débit se faisant de façon très simple par la seule manoeuvre du curseur 20 sur la barre 17 qui le porte. In addition, the constant volume of product conveyed during each cycle can be easily modified, which makes this pump a metering pump, the adjustment of the flow rate being done very simply by the simple operation of the cursor 20 on the bar 17 who wears it.

On constate en effet, sur la figure 3 que, si on déplace le curseur 20 vers la droite, le piston 3 arrête son mouvement d'aspiration avant que la chambre 1.4 ait atteint son volume maximum défini ci-dessus, reduisant donc de façon constante au cours de chaque cycle successif la quantite de produit aspire. On peut donc ainsi doser de façon aisee et très précise le débit de la pompe. In fact, it can be seen in FIG. 3 that, if the cursor 20 is moved to the right, the piston 3 stops its suction movement before the chamber 1.4 has reached its maximum volume defined above, thus reducing constantly during each successive cycle the quantity of product sucks. We can therefore easily and very precisely dose the pump flow.

De même, le contact fin de course 16 est monté coulissant sur le bras 18. On constate donc (fig. 4) que si l'on déplace ce contact vers la gauche de la figure, le piston 2, en l'atteignant par l'intermédiaire de son bras 19 situé à sa partie arrière, provoque le début du cycle suivant avant que la chambre 14 ait ete totalement comprimée. Similarly, the limit switch contact 16 is slidably mounted on the arm 18. It can therefore be seen (fig. 4) that if this contact is moved to the left of the figure, the piston 2, reaching it by means of the 'Intermediate of its arm 19 located at its rear part, causes the start of the next cycle before the chamber 14 has been fully compressed.

Le dispositif étant ainsi constitué, il est clair qu'une telle pompe, particulièrement simple dans sa construction, est d'un entretien particulièrement aise, ce qui est un grand avantage dans les industries alimentaires. The device being thus formed, it is clear that such a pump, particularly simple in its construction, is particularly easy to maintain, which is a great advantage in the food industries.

Etant en effet constituee essentiellement des deux seuls pistons 2 et 3, sans aucun clapet ni vanne, il suffit de déconnecter la tige centrale 12 du bras 6 qui la conduit, ainsi que le bras 7 du vérin 5 qui le commande, pour qu'à la suite de ces deux seules opérations simples à exécuter les deux pistons 2 et 3 soient facilement extraits du cylindre 1, chacune de ces trois pièces (1,2 et 3), les seules qui soient en contact avec les produits pouvant alors être aisément nettoyées.Being essentially constituted of only two pistons 2 and 3, without any valve or valve, it suffices to disconnect the central rod 12 from the arm 6 which leads it, as well as the arm 7 of the jack 5 which controls it, so that at the result of these two simple operations simple to execute the two pistons 2 and 3 are easily extracted from the cylinder 1, each of these three parts (1,2 and 3), the only ones which are in contact with the products which can then be easily cleaned .

L'emploi de ce dispositif est donc particulièrement avantageux en combinaison, sur une même chatne, avec en amont un distributeur automatique de recipients de conserve, et en aval une machine automatique à capsuler lesdits récipients, ce dispositif permettant de doser les différents volumes de produit à distribuer selon chaque type de récipient, et permettant d'adapter le taux de compression a la nature du produit et a sa fragilité, ce résultat étant obtenu par l'opérateur par le simple deplacement des curseurs 20 et 16 comme il vient d'être dit. The use of this device is therefore particularly advantageous in combination, on the same rod, with upstream an automatic dispenser of canned containers, and downstream an automatic machine for capping said containers, this device making it possible to dose the different volumes of product to be distributed according to each type of container, and making it possible to adapt the compression ratio to the nature of the product and to its fragility, this result being obtained by the operator by simply moving the sliders 20 and 16 as has just been said.

Selon encore un autre mode de réalisation de l'objet de l'invention, (figures 5, 6, 7 et 8), les pistons 2 et 3 se trouvant dans la position de la figure 5, identique à celle de la figure 1, qui représente la position relative des organes au debut du cycle, c'est, dans le cas present, sous l'action du seul verin 5 autorise par le palpeur, non représenté, que les deux pistons 2 et 3 se deplacent ensemble, le piston 2 étant poussé par le piston 3, jusqu'à ce que leurs deux faces accolees atteignent le bord extérieur de l'orifice 9 (fig.6). A cet instant, le bras 7 situe à l'arrière du piston 3 atteint le contact 24 qui provoque le renversement du sens de marche du verin 5, qui, etant encore seul en mouvement, ramène le piston 3 jusqu'à une distance du bord intérieur de l'orifice de refoulement Il toujours superieure au diamètre de ce dernier, donc sans l'avoir decouvert. Durant cette phase, le piston 2 reste immobile ne subissant aucune sollicitation de la part du vérin 4 qui le commande, et le piston 3 coulissant librement sur l'axe 12. According to yet another embodiment of the object of the invention, (FIGS. 5, 6, 7 and 8), the pistons 2 and 3 being in the position of FIG. 5, identical to that of FIG. 1, which represents the relative position of the organs at the start of the cycle, it is, in this case, under the action of the single jack 5 authorized by the feeler, not shown, that the two pistons 2 and 3 move together, the piston 2 being pushed by the piston 3, until their two joined sides reach the outer edge of the orifice 9 (fig.6). At this instant, the arm 7 located at the rear of the piston 3 reaches the contact 24 which causes the reversal of the direction of travel of the actuator 5, which, being still alone in movement, brings the piston 3 to a distance from the edge inside the delivery port It always exceeds the diameter of the latter, therefore without having discovered it. During this phase, the piston 2 remains stationary, undergoing no stress from the actuator 4 which controls it, and the piston 3 sliding freely on the axis 12.

Ce mouvement du seul piston 3 qui aura découvert l'orifice d'aspiration 9 (fig.7) produit l'aspiration dans la chambre 14 du produit contenu dans le bac 8. This movement of the only piston 3 which has discovered the suction orifice 9 (fig. 7) produces the suction in the chamber 14 of the product contained in the tank 8.

A cet instant, selon la figure 7, la face extérieure munie du bras 7 du piston 3 vient en contact avec le curseur réglable 25 coulissant sur l'axe 12. Le verin 5 continuant sa course entraine alors simultanement les deux pistons 2 et 3, qui se deplacent ensemble sous l'impulsion du seul vérin 5 jusqu'à ce que la face intérieure du piston 3 atteigne le bord exterieur de l'orifice 11 de refoulement (fig. 8). Durant ce déplacement la chambre 14 contenant le produit aspiré se deplace sans que son volume ne varie jamais. Et l'orifice 9 d'aspiration a ete ferme avant que l'orifice de refoulement 11 ait commencé à etre demasque par le piston 3. At this instant, according to FIG. 7, the outer face provided with the arm 7 of the piston 3 comes into contact with the adjustable cursor 25 sliding on the axis 12. The jack 5 continuing its course then simultaneously drives the two pistons 2 and 3, which move together under the impulse of the single jack 5 until the inner face of the piston 3 reaches the outer edge of the outlet port 11 (fig. 8). During this movement, the chamber 14 containing the aspirated product moves without its volume ever varying. And the suction opening 9 was closed before the delivery opening 11 began to be exposed by the piston 3.

Selon la figure 8, le contact 26 est alors atteint par le bras 7, provoquant l'immobilisation du vérin 5 en même temps que le démarrage du verin 4 dont l'axe coulisse librement dans le bras et sur lequel axe est situé le curseur 27 régle selon le taux de compression desiré. Lorsque le curseur 27, au cours du développement ainsi obtenu du verin 4, atteint le bras 6 solidaire de l'axe 12, il entraÎne le seul piston 2, laissant immobile le piston 3, ce qui a pour effet de réduire la chambre 14 donc de comprimer le produit qu'elle contient et de l'évacuer à travers l'orifice 11. According to FIG. 8, the contact 26 is then reached by the arm 7, causing the immobilization of the jack 5 at the same time as the start of the jack 4 whose axis slides freely in the arm and on which axis the cursor 27 is located. adjusts according to the desired compression ratio. When the cursor 27, during the development thus obtained from the actuator 4, reaches the arm 6 integral with the axis 12, it drives the only piston 2, leaving the piston 3 immobile, which has the effect of reducing the chamber 14 therefore to compress the product which it contains and to evacuate it through the opening 11.

Ce mouvement se poursuit jusqu'à ce que la butee 28 située de façon fixe à l'extrémité de l'axe du vérin 4 atteigne le contact 29 qui arrete le vérin 4 et assure ie redémarrage du cycle, par le mouvement de nouveau du seul vérin 5, pour autant d'ailleurs que le palpeur, non représenté, qui contrôle le passage des récipients, l'autorise. This movement continues until the stop 28 located fixedly at the end of the axis of the jack 4 reaches the contact 29 which stops the jack 4 and ensures the restarting of the cycle, by the movement once again cylinder 5, provided that the probe, not shown, which controls the passage of the containers, authorizes it.

On constate que ce mode de réalisation présente l'avantage d'une plus grande sécurité de fonctionnement, puisque chacun des mouvements des deux pistons, n'est commandé dans chacune des phases que par un seul vérin, le vérin 5 ou le vérin 4, même dans leur mouvement simultané qui est obtenu par la poussée que le piston 3, manoeuvré par le seul vérin 5, exerce sur le piston 2.Tandis que selon le mode de réalisation précédent, la simultanéité des mouvements des pistons 2 et 3 n'est obtenue que par le parfait synchronisme des mouvements des deux vérins 4 et 5, ce qui n' ex- clut pas la possibilite de quelques déréglages, le synchronisme étant obtenu que par un parfait équilibre de la pression de l'air distribue a chacun des vérins-moteurs qui par ailleurs peuvent supporter des efforts de frottement différents les résultantes n'étant pas toujours égales ni constantes. It can be seen that this embodiment has the advantage of greater operational safety, since each of the movements of the two pistons is only controlled in each of the phases by a single cylinder, the cylinder 5 or the cylinder 4, even in their simultaneous movement which is obtained by the thrust that the piston 3, maneuvered by the single cylinder 5, exerts on the piston 2. While according to the previous embodiment, the simultaneity of the movements of the pistons 2 and 3 is not obtained only by the perfect synchronism of the movements of the two cylinders 4 and 5, which does not exclude the possibility of some misadjustments, the synchronism being obtained only by a perfect balance of the pressure of the air distributed to each of the cylinders -motors which, moreover, can withstand different friction forces, the results being not always equal or constant.

Quant aux réglages du débit de la pompe aussi bien que celui de sa compression pour véhiculer des produits fragiles, ils sont aussi faciles a obtenir que précédemment. Il suffit en effet de déplacer le curseur 25 sur l'axe 12 pour que le piston 3, dans son mouvement de retour, entraÎne le piston 2 après avoir parcouru lui-même une course prévue qui determine le développement de la chambre 14, donc le volume aspiré. De la même manière, il suffit de déplacer le curseur 27 sur l'axe duvérin 4 pour que soit differente aussi la course du piston 2, qui comprime la chambre 14, ce qui permet de ne pas atteindre le taux de compression maximum, épargnant ainsi les produits fragiles. As for the settings of the pump flow rate as well as that of its compression to convey fragile products, they are as easy to obtain as before. It suffices in fact to move the cursor 25 on the axis 12 so that the piston 3, in its return movement, drives the piston 2 after having itself traveled a planned stroke which determines the development of the chamber 14, therefore the aspirated volume. In the same way, it suffices to move the cursor 27 on the axis of the actuator 4 so that the stroke of the piston 2, which compresses the chamber 14, is also different, which makes it possible not to reach the maximum compression rate, thus saving fragile products.

On constate aussi que l'automatisme de ce mode de réalisation ne nécessite que trois contacts seulement (24, 26 et 29) alors que le mode de réalisation précédent en nécessitait quatre, d'où un circuit de commande plus simple. We also note that the automation of this embodiment requires only three contacts only (24, 26 and 29) while the previous embodiment required four, resulting in a simpler control circuit.

Le fonctionnement de la pompe ainsi constituee s'effectuera donc dans les mêmes conditions générales que celles précédemment décrites sans qu'il soit nécessaire d'en renouveler la description détaillée, la même succession des mouvements se retrouvant, seuls les moyens d'entraÎnement des pistons et de réglage étant différemment organisés, de la manière qui vient d'être dite. The operation of the pump thus constituted will therefore be carried out under the same general conditions as those previously described without it being necessary to renew the detailed description, the same succession of movements being found, only the means for driving the pistons and adjustment being organized differently, in the manner which has just been said.

L'invention n'est pas limitée a l'exemple ou aux exemples qui en ont été décrits, toute variante, considérée comme une équivalence, ne pouvant en modifier la portée. The invention is not limited to the example or examples which have been described, any variant, considered as equivalence, which cannot modify its scope.

C'est ainsi que les vérins moteurs pourraient être aussi bien des vérins électriques que pneumatiques sans que l'économie de l'invention slen trouve modifiée. C'est ainsi aussi que le piston 2 pourrait être commandé directement par son vérin 4 sans que l'axe 12, qui l'entraîne, traverse le piston 3, la presence de cet axe 12 n'ayant pour but, comme il a été dit, que d'assurer un meilleur guidage de chacun des pistons lorsque chacun d'eux se trouve à une extrémité du cylindre commun 1. This is how the power cylinders could be both electric and pneumatic cylinders without the economy of the invention being found to be modified. It is thus also that the piston 2 could be controlled directly by its cylinder 4 without the axis 12, which drives it, passing through the piston 3, the presence of this axis 12 not having the purpose, as it was says that to ensure better guidance of each of the pistons when each of them is at one end of the common cylinder 1.

L'invention peut être utilisée comme pompe doseuse pour la distribution automatique, aussi bien dans des récipients de conserve que dans des contenants comestibles, des pâtes de biscuiterie, des cremes de pâtisserie, des confitures ou autres confiseries, ainsi que des conserves de toute nature: fruits , légumes, champignons, patés, etc... dont la fragilité exclue l'utilisation de pompes qui les détérioreraient par excès de pression. The invention can be used as a dosing pump for automatic dispensing, both in canned containers and in edible containers, cookie doughs, pastry creams, jams or other confectionery, as well as preserves of all kinds. : fruits, vegetables, mushrooms, pâtés, etc ... whose fragility precludes the use of pumps which would damage them by excess pressure.

Claims

10) - Device for dosing and automatically distributing in successive containers pasty products or liquids loaded with fragile substances,

Characterized by the fact that it comprises, movable in the same cylinder (1) open at its two ends, two pistons (2) and (3) independent of each other, capable of moving separately so as to create between them a suction chamber (14) receiving the product to be conveyed, or to move simultaneously and at the same speed so as to effect the translation in the cylinder (1) of said chamber (14), without modifying its volume, from the orifice suction (9), with which it was in communication, up to the level of the discharge orifice (11), at the level of which only one of the two pistons moves relative to the other so as to compress said chamber, and expel the product which it contains, through the discharge orifice with which it communicates in this position, the two pistons (2) and (3) returning together to the level of the suction orifice (9) for the renewal of the cycle, said orifices (9) and (11) being successively closed and discovered by said pistons themselves during their movements.

2 "- Device according to claim 1,

Characterized by the fact that the two pistons (2) and (3) independent of each other can be moved each by a separate cylinder, such as the cylinders (4) and (5), the movements of each of being slaved by a circuit distributing energy, such as a pneumatic circuit, organized according to a determined logic whose successive phases are introduced by limit switches operated by the pistons themselves during their movements, thus ensuring successively by the only axial displacement of said pistons the development of the chamber (14) in communication with the orifice (9) of suction by the displacement of a single piston, then the displacement of said chamber, at constant volume, up to 'At the discharge orifice (11) by the simultaneous displacement of the two pistons, followed by the compression of said chamber in communication with the discharge orifice by the displacement of a single piston relative to the other.

3) - Device according to claim 2,

Characterized by the fact that one of the two pistons, the piston (2) for example, is controlled by its cylinder (4) by means of the axis (12) which - crosses the other piston in its center, sliding there freely freely.

4) - Device according to claim 2,

Characterized by the fact that the circuit which distributes the energy to each of the jacks (4) and (5), which set the pistons (2) and (3) in motion, is organized by means of known suitable components in such a way that the inner faces of the two pistons being joined and the piston (2) closing the orifices (9) and (11) of suction and discharge, the jacks (4) and (5) move them both in synchronism until the two adjoining faces of the pistons (2) and (3) are at the outer limit of the suction orifice (9); the limit switch contact (13), being reached by the arm (7) of the piston (3), causes the immobilization of the piston (2) and the reversal of the movement of the piston (3) moved by the piston (5) , which creates the chamber (14) communicating with the tank (8) through the orifice (9) of suction; the contact (15), being reached by the cursor 20 secured to the piston (3) when the latter has moved back at most to a distance from the inner edge of the discharge orifice (11) always greater than. diameter of said orifice which therefore remains closed by the piston (3), causes the actuator (4) which drives the piston (2) in the same direction as the piston (3) and at the same speed, thus displacing the chamber (14), without its volume varying, until the piston (3) uncovers the delivery orifice (11), the piston (2) now completely closed the suction orifice (9); the contact (30), being reached by the arm (7) of the piston (3), causes the actuator (5), therefore the piston (3) to stop, while the piston (2) continues its stroke, which causes compression of the chamber (14) from where expulsion through the orifice (11) of the product contained in said chamber, until the finger (19) integral with the piston (2) reaches the contact ( 16); the cycle restarting automatically, provided that the probe also notes the presence at the inlet of the apparatus of a container ready to receive the product thus dispensed.

5) - Device according to claim 4,

Characterized by the fact that the contact (15) is mounted mobile on the arm (17) parallel to the axis of the pistons, in order to allow the volume of the suction chamber to be adjusted, and the contact (16) is mounted mobile on the bar (18) parallel to the axis of the pistons, to allow adjustment of the compression ratio.

6) - Device according to claim 2,

Characterized by the fact that the circuit which distributes the energy to each of the jacks (4) and (5) which set the piston (2) in motion is

organizes by means of suitable known components in such a way that

the inner faces of the pistons being placed side by side and the piston (2) closing the orifices (9) and (11) of suction and discharge, the jack (5) comes into action alone to move the two pistons, the piston (3) directly controlled by the jack (5) driving the piston (2) with which it is in contact, this movement continuing until the two orifices (9) and (11) are completely closed by the piston (3); at this instant the contact (24), being reached by the arm (7) of the piston (3), causes the reversal of the jack (5) which causes the piston (3) to discover the orifice (9) of suction and creating the chamber (14) until the piston (3) is at a distance from the discharge orifice 11 l) always greater than the diameter of the latter, and without having discovered it; the piston (3), continuing its stroke comes into contact with the cursor (25) located on the axis (12) of the piston (2) according to the setting chosen to determine the suction chamber (14), thus driving the piston (2) at the same time as it, which has the effect of moving the chamber (14) which always retains its same volume, until the piston (3) completely uncovers the orifice (I l) for delivery, I 'suction port (9) being kept closed by the piston (2); the contact (26), being then reached by the arm (7) of the piston (3), the jack (5) is no longer supplied thus blocking the piston (3) in this position, at the same time as the same contact ( 26) authorizes the supply of the jack (4), on the axis of which the cursor (27) is adjusted according to the desired compression ratio, said axis sliding in the arm (6) by means of which said cursor (27) drives the piston (2); the contact (29), being finally reached by the cleat (28) integral with the end of the axis of the jack (4), stops the supply of said jack, therefore stops the piston (2) which has ensured expulsion through the orifice (11) of the product contained in the chamber (14); the cycle then restarting automatically, provided that the probe also notes the presence at the entrance of the apparatus of a container ready to receive the product thus dispensed.

7) - Device according to claim 6,

Characterized by the fact that the slider (25) is mounted mobile on the axis (12) of the piston (2), in order to allow the adjustment of the suction chamber (14), and the slider (27) is mounted movable on the axis of the jack (4) which controls the piston (2). to allow adjustment of the compression ratio.