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Title:
DISPENSER HEAD FOR A DISPENSING MACHINE FOR PRODUCTS OR FLUIDS, SUCH AS PAINTS
Document Type and Number:
WIPO Patent Application WO/2017/208181
Kind Code:
A1
Abstract:
Dispenser head for a dispensing machine for products or fluids, comprising: a head body (2) having at least one primary tube (4); a sliding support (6) adapted to slide relative to the head body (2) along a sliding axis (x-x); a secondary tube (8), constrained to the sliding support (6), adapted to slide relative to the primary tube (4) parallel to the sliding axis (x-x), wherein a first end (8a) of the secondary tube (8) is in fluidic communication with the primary tube (4) in every position of the travel of the secondary tube (8); a rotatable nozzle (10) constrained to the head body (2) with freedom of rotation about an axis of rotation (y-y) parallel to the sliding axis (x-x), wherein the rotatable nozzle (10) is in fluidic communication with a second end (8b) of the secondary tube (8) in every position of the travel of the secondary tube (8). The rotatable nozzle (10) comprises, at a distal end thereof, an outlet hole (12) which is offset relative to the axis of rotation (y-y) for dispensing the fluid. Guiding means are provided, which are so designed that the sliding motion of the secondary tube (8) parallel to the sliding axis (x-x) will determine the rotary motion of the rotatable nozzle (10) about its axis of rotation (y-y). A terminal element (14) is located in contact with the distal end of the rotatable nozzle (10) and has a terminal hole (16). The rotatable nozzle (10) can take a dispensation angular position, in which the outlet hole (12) and the terminal hole (16) are aligned with each other, thereby allowing dispensation of the fluid, and a closed angular position, in which the outlet hole (12) is obstructed by the terminal element (14), thereby preventing dispensation of the fluid.

Inventors:
DROCCO, Luca (Strada Castelgherlone 42, Alba, I-12051, IT)
DROCCO, Mario (Via Pieroni Giuseppe 32, Alba, I-12051, IT)
Application Number:
IB2017/053222
Publication Date:
December 07, 2017
Filing Date:
June 01, 2017
Export Citation:
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Assignee:
DROMONT SPA (VIA BORZONE 42, ALBA, 12060, IT)
International Classes:
B05B1/32; B05B1/28; B05B15/02
Attorney, Agent or Firm:
BARZANO' & ZANARDO MILANO SPA (Corso Vittorio Emanuele II 61, Torino, I-10128, IT)
Download PDF:
Claims:
CLAIMS

1. Dispenser head for a dispensing machine for products or fluids, such as paints, comprising:

- a head body (2) having at least one primary tube (4) in which a fluid is intended to flow;

characterized in that it comprises:

- a sliding support (6), adapted to slide relative to said head body (2) along a sliding axis (x-x) ;

at least one secondary tube (8), constrained to said sliding support (6), adapted to slide relative to said primary tube (4) parallel to said sliding axis (x-x), wherein a first end (8a) of said secondary tube (8) is in fluidic communication with said primary tube (4) in every position of the travel of said secondary tube (8);

- at least one rotatable nozzle (10), constrained to said head body (2) with freedom of rotation about an axis of rotation (y-y) parallel to said sliding axis (x-x), said rotatable nozzle (10) being in fluidic communication with a second end (8b) of said secondary tube (8) in every position of the travel of said secondary tube (8), said rotatable nozzle (10) comprising, at a distal end thereof, an outlet hole (12) which is offset relative to said axis of rotation (y-y) for dispensing the fluid outwards;

- guiding means so designed that the sliding motion of said secondary tube (8) parallel to the sliding axis (x-x) will determine the rotary motion of said rotatable nozzle (10) about its axis of rotation (y-y) ;

- a terminal element (14) located in contact with said distal end of said rotatable nozzle (10) and having at least one terminal hole (16) ,

said rotatable nozzle (10) being susceptible of taking a dispensation angular position, in which said outlet hole (12) and said terminal hole (16) are aligned with each other, thereby allowing dispensation of the fluid, and a closed angular position, in which said outlet hole (12) is obstructed by said terminal element (14), thereby preventing dispensation of the fluid.

2. Dispenser head according to claim 1, wherein said guiding means comprise complementary guiding surfaces formed on said rotatable nozzle (10) and on either said secondary tube (8) or said sliding support ( 6 ) .

3. Dispenser head according to claim 2, wherein said guiding surfaces are formed on said rotatable nozzle (10) and on said secondary tube (8).

4. Dispenser head according to claim 3, wherein said guiding surfaces comprise a protrusion (26) associated with either said rotatable nozzle (10) or said secondary tube (8), and a guide (28) associated with said secondary tube (8) or, respectively, said rotatable nozzle (10), in which said protrusion is intended to slide.

5. Dispenser head according to any one of the preceding claims, wherein said first end (8a) and, respectively, said second end (8b) of said secondary tube (8) are adapted for sliding on the outer or inner surface of said primary tube (4) and, respectively, of said rotatable nozzle (10), while preserving the fluid sealing property.

6. Dispenser head according to any one of the preceding claims, comprising a mobile plug adapted to position itself on the outer part of the terminal end in order to obstruct and clear the air passage towards the terminal hole (16).

7. Dispenser head according to any one of the preceding claims, wherein said head body (2) includes an upper half-body (2a), to which said at least one primary tube (4) is secured, and a lower half-body (2b), with which said at least one rotatable nozzle (10) is associated; said upper and lower half-bodies forming a cavity in which said sliding support (6) is received.

8. Dispenser head according to any one of the preceding claims, wherein said terminal element (14) comprises a plate having at least one terminal hole (16) .

9. Dispenser head according to any one of the preceding claims, comprising an actuator for moving said sliding support (6) along said sliding axis (x-x) .

10. Dispenser head according to any one of the preceding claims, wherein said terminal element (14) comprises a seat (17) for receiving the end of said rotatable nozzle (10) in which there is said outlet hole (12), allowing said rotatable nozzle (10) to rotate about its axis of rotation (y-y) ; said terminal hole (16) being in said seat (17) .

11. Dispenser head according to any one of the preceding claims, comprising :

- a mobile portion (48), which can take a closed position, in which air is prevented from flowing towards the terminal hole (16) from the outside, and a dispensing position, in which fluid can be dispensed through the terminal hole (16) into a container; and

- a suction device for sucking the air between the mobile portion (48) and the terminal hole (16) when the mobile portion (48) is in the closed position.

12. Dispenser head according to claim 11, wherein between the closed position and the dispensing position, the mobile portion (48) can take an intermediate position in which it (48) is arranged under the terminal hole (16), at a distance therefrom, thus leaving said terminal hole (16) in communication with the outside air.

13. Dispenser head according to claim 11 or 12, wherein the mobile portion (48) has an upper part (60) and a lower part (62) separable from each other, between which a removable fluid collector (66) is interposed for collecting any excess drops of fluid.

14. Dispenser head according to claim 13, wherein the upper part (60) comprises at least one suction duct (70) adapted to place itself at a respective terminal hole (16) when the mobile portion (48) is in the closed position; air being sucked through the suction duct (70) .

15. Dispenser head according to any one of claims 12 to 14, wherein, starting from the closed position, the mobile portion (48) is adapted to move away from the terminal holes (16) by translating downwards into the intermediate position; the mobile portion (48), during the transition from the intermediate position to the dispensing position, is adapted to make simultaneous turning and lowering motions.

16. Dispensing machine for products or fluids, including a dispenser head according to any one of the preceding claims .

Description:
TITLE: "Dispenser head for a dispensing machine for products or fluids, such as paints"

DESCRIPTION

Technical field

The present invention relates to a dispenser head for a dispensing machine for products or fluids, such as paints, dyes, additives, or chemical components in general.

Background art

In the field of fluid dispensing machines, it is known to employ closing devices adapted to close the outlet mouth of a fluid dispenser, which is typically provided with at least one dispensing nozzle, when the machine has completed the dispensing operation. This prevents the fluid near the outlet mouth of the nozzle from remaining exposed to air, since it is susceptible of deterioration.

The use of closing devices of the above-mentioned type is particularly widespread in the field of paints and dyes, wherein machines are typically used which comprise a dispenser head that houses a plurality of nozzles adapted to dispense fluids having different properties and/or colours, e.g. by directing dosed amounts of such fluids into a container for forming a mixture having the desired composition. In such applications, in fact, prolonged exposition to air of the fluid near the outlet may cause the fluid to dry up. This problem is particularly felt when it is necessary to dispense latest-generation paints, additives or dyes. In order to comply with the latest antipollution regulations, in fact, some fluids, such as modern paints, have chemical compositions that cause them to dry up quickly when exposed to air. If the fluid dries up because of undesired exposition to air, it becomes necessary to mechanically remove the residual scaling or drops, e.g. by means of brushes, or to carry out periodic flushing operations. Such tasks are generally uncomfortable and not very practical.

Summary of the invention

It is one object of the present invention to provide a dispenser head for a dispensing machine for products or fluids which can overcome the drawbacks of the prior art, while at the same time being simple and economical to manufacture.

In particular, one of the goals achieved by the present invention is to prevent undesired exposition of the nozzles of the fluid dispenser to the outside environment, while creating a compact dispenser head.

According to the present invention, this and other objects are achieved through a dispenser head having the features set out in the appended independent claim.

It is to be understood that the appended claims are an integral part of the technical teachings provided in the following detailed description of the invention. In particular, the appended dependent claims define some preferred embodiments of the present invention, which include some optional technical features.

Further features and advantages of the present invention will become apparent from the following detailed description, which is supplied by way of non-limiting example with particular reference to the annexed drawings, which will be summarized below.

Brief description of the drawings

Figure 1 is a perspective view of a dispenser head in accordance with an illustrative embodiment of the present invention.

Figure 2 is a longitudinal sectional view of the dispenser head according to the embodiment of Figure 1.

Figure 3 is a perspective view illustrating a lower part of the dispenser head shown in Figure 1.

Figure 4 is an exploded perspective view of the dispenser head according to the embodiment of Figure 1.

Figure 5 shows the detail contained in the frame designated as V in Figure 2.

Figure 6 is a front view of a detail in accordance with a particular exemplificative embodiment of the present invention.

Figure 7 is a perspective view of a terminal element in accordance with a preferred embodiment of the present invention.

Figures 8a, 8b, 8c are perspective views of a part of the dispenser head according to a further variant of the invention, in different operating positions.

Figure 9 is a perspective view of the dispenser head according to the variant shown in Figures 8a, 8b, 8c.

Figure 10 is a longitudinal sectional view of the detail of

Figure 8a.

Detailed description of the invention

With particular reference to the drawings, there is shown a dispenser head for a dispensing machine for products or fluids, in particular liquids, such as paints, comprising:

- a head body 2 having at least one primary tube 4, in which a fluid is intended to flow;

- a sliding support 6, adapted to slide relative to said head body 2 along a sliding axis x-x;

- at least one secondary tube 8, constrained to said sliding support 6, adapted to slide relative to said primary tube 4 parallel to said sliding axis x-x, wherein a first end 8a of said secondary tube 8 is in fluidic communication with said primary tube 4 in every position of the travel of said secondary tube 8;

- at least one rotatable nozzle 10, constrained to said head body 2 with freedom of rotation about an axis of rotation y-y parallel to said sliding axis x-x, said rotatable nozzle 10 being in fluidic communication with a second end 8b of said secondary tube 8 in every position of the travel of said secondary tube 8, said rotatable nozzle 10 comprising, at a distal end thereof, an outlet hole 12 which is offset relative to said axis of rotation y-y for dispensing the fluid outwards,

- guiding means so designed that the sliding motion of said secondary tube 8 parallel to the sliding axis x-x will determine the rotational motion of said rotatable nozzle 10 about its axis of rotation y-y.

A terminal element 14 is located in contact with the distal end of the rotatable nozzle 10 and has at least one terminal hole 16. The rotatable nozzle 10 is susceptible of taking a dispensation angular position, in which said outlet hole 12 and said terminal hole 16 are aligned with each other, thereby allowing dispensation of the fluid, and a closed angular position, in which said outlet hole 12 is obstructed by said terminal element 14, thereby preventing dispensation of the fluid.

The terminal holes 16 define an outlet, through which the fluid is dispensed into the container.

By way of example, the products may be finished or semi-finished products, and may be in fluidic or semi-fluidic form, such as paint, dyes, additives, or chemical components.

With reference to the drawings, the distal end of the rotatable nozzle 10 is the bottom end, where the outlet hole 12 is located.

The sliding support 6 is housed in a cavity of the head body 2, in which it can slide along the sliding axis x-x, which is vertical in Figure 2.

Conveniently, there are a plurality of primary tubes 4, secondary tubes 8, and revolving pins 10, which co-operate as described. In general, in each tube a different fluid flows, which is then dispensed into a container according to predefined proportions. In the illustrated example, the primary tubes 4 are substantially equidistant and are arranged along a substantially circular perimeter (in the plane perpendicular to the axis x-x) . In particular, the primary tubes 4 and/or the secondary tubes 8 are substantially straight.

With particular reference to Figure 6, the guiding means comprise complementary guiding surfaces formed on the rotatable nozzle 10 and on either the secondary tube 8 or the sliding support 6. Preferably, the guiding surfaces are formed on the rotatable nozzle 10 and on the secondary tube 8. In particular, the guiding surfaces comprise a protrusion 26 associated with either said rotatable nozzle 10 or said secondary tube 8, and a guide 28, associated with said secondary tube 8 or, respectively, said rotatable nozzle 10, in which said protrusion 26 is intended to slide. In the illustrated example, the protrusion 26 (conveniently consisting of a pin) is associated with the rotatable nozzle 10, and the guide 28, in particular consisting of a slot, is formed on the secondary tube 8. In particular, the guide 28 is helical in shape; however, the guide 28 may have different shapes as well, depending on the relationship to be established between the motion of the sliding support 6 and that of the revolving pin 10; for example, the guide 28 may have, as an alternative, a "J" shape. In general, the guiding means are configured for constraining the rotation of the rotatable nozzle 10 to the sliding action of the secondary tube 8. As can be noticed in Figure 6, the rotatable nozzle 10 is intended to slide partially within the secondary tube 8.

As the sliding support 6 slides, it causes the secondary tube 8 to slide as well, which, through the guiding means, rotates the rotatable nozzle 10 between the dispensation angular position and the closed angular position. When the rotatable nozzle 10 is in the closed angular position, the outlet hole 12 is obstructed by a surface of the terminal element 14 with no terminal holes 16, thereby preventing the fluid from being dispensed outwards. In the closed angular position, air is prevented to enter from the outside environment towards the ducts where the fluid remains (rotatable nozzle 10, secondary tube 8 and primary tube 4), thus preventing said fluid from drying up when no dispensation is taking place. When the rotatable nozzle 10 is rotated, the outlet hole 12 moves into the dispensation angular position, in which said outlet hole 12 is aligned with the terminal hole 16, thereby creating an outlet channel for the fluid towards the outside environment. Once dispensation is over, the rotatable nozzle 10 returns into the closed angular position. Preferably, the rotation of the rotatable nozzle 10 is limited between the dispensation angular position and the closed angular position. The angular rotation of the rotatable nozzle 10 is limited by the travel of the sliding support 6 (and hence of the secondary tube 8) along the sliding axis x-x. A bottom face of the rotatable nozzle 10, in which the outlet hole 12 is formed, is intended to slide on the terminal element 14 as the rotatable nozzle 10 rotates.

Optionally, return means, e.g. elastic means (such as springs), tend to bring the rotatable nozzle 10 into the closed angular position. Such return means may act, for example, upon the sliding support 6.

The first end 8a and the second end 8b of said secondary tube 8 are sealingly connected to said primary tube 4 and, respectively, to said rotatable nozzle 10. Preferably, the first end 8a and, respectively, the second end 8b of said secondary tube 8 are adapted to slide on the outer or inner surface of said primary tube 4 and, respectively, of said rotatable nozzle 10, while preserving the fluid sealing property. Thus, throughout the travel of the secondary tube 8 along the sliding axis x-x, a sliding channel is provided for the fluid from the primary tube 4 to the rotatable nozzle 10 without any leakage. Sealing can be ensured by using per se known sealing means, such as gaskets, or sealing paste or paint. In accordance with an alternative variant, the secondary tube 8 is sealingly connected to the primary tube 4 and/or to the rotatable nozzle through a respective bellows .

With reference to the illustrated variant, the head body 2 includes an upper half-body 2a, to which said at least one primary tube 4 is secured, and a lower half-body 2b, with which said at least one rotatable nozzle 10 is associated; the upper half-body 2a and the lower half-body 2b form a cavity in which said sliding support 6 is received. Conveniently, the cavity in the head body 2 is cylindrical, and the side surface of the sliding support 6 is circular. In this example, the sliding support has a disk-like shape. Preferably, the terminal element 14 comprises a plate, in particular circular in shape, having said at least one terminal hole 16. The terminal element 14 can thus have a disk-like shape. In particular, the circular plate is removably mounted on the lower half- body 2b by means of a ring nut 24. Each rotatable nozzle 10 rotates on a respective zone of the terminal element 14, thus avoiding that the part of fluid possibly deposited on that zone might come in contact with the fluid deposited on the zone of another rotatable nozzle 10, causing contamination of the different fluids. Preferably, the terminal element 14 is made of metallic material, e.g. brass, or plastic or polymeric material.

With particular reference to Figure 7, the terminal element 14 comprises a seat 17 for receiving the end of the rotatable nozzle 10 in which there is the outlet hole 12, allowing said rotatable nozzle 10 to rotate about its axis of rotation y-y. In the seat 17 there is the terminal hole 16. In the illustrated example, the seat 17 is circular; in particular, the terminal hole 16 is offset relative to said seat 17. In particular, the outer surface of said end of the rotatable nozzle 10 is cylindrical. The seat 17 contributes to keeping the rotatable nozzle 10 in the correct position. Moreover, when multiple rotatable nozzles 10 are employed, this also avoids contamination between the different fluids of the different rotatable nozzles 10. Preferably, the terminal element 14 comprises a flat surface facing towards the rotatable nozzle 10, in which the at least one seat 17 is located.

With reference to Figure 5, the rotatable nozzle 10 comprises an inlet duct 18 facing towards the second end 8b of the secondary tube 8, and an outlet duct 20, in fluidic communication with the inlet duct 18, that ends into the outlet hole 12. In particular, the inlet duct 18 is aligned with the axis of rotation y-y, and the outlet duct 20 is substantially parallel and offset relative to said axis y-y. In particular, in Figure 5 the rotatable nozzle 10 is in the dispensation angular position, since the outlet holes 12 are positioned at the terminal holes 16. Therefore, the fluid will flow from the secondary tube 8 into the inlet duct 18, flowing then into the outlet duct 20 until it reaches the outlet hole 12.

Conveniently, the dispenser head comprises an actuator 30, e.g. a hydraulic, pneumatic or electric actuator, for moving said sliding support 6 along said sliding axis x-x . Transmission means, in particular one or more rods 32, are adapted to transmit the motion from the actuator 30, in particular a linear actuator, to the sliding support 6. Optionally, manual actuating means are available for moving said sliding support 6 along said sliding axis x-x.

A support structure constrains the actuator 30 to the head body

2, in particular to the upper half-body 2a. In this particular example, the support structure includes an upper plate 34 connected to the actuator 30, a plurality of columns 36 connecting the upper plate 34 to a lower plate 38, which is removably mounted on the upper half- body 2a, in particular on a flange 40 thereof.

The actuator 30 comprises a mobile portion 42 for moving the rods 32 along the sliding axis x-x. Such rods 32 are conveniently mounted on a constraining portion 44 whereupon said mobile portion 42 acts. For example, the rods 32 are at least partly threaded and are secured to the constraining portion 44 by means of nuts 46. In particular, the rods 32 slide between the plurality of primary tubes 4, which are fixed relative to the head body 2.

In another optional embodiment, a drop collector plate is arranged under the dispenser head for collecting any product residues. In this case, before starting the dispensation process it will be necessary to move the drop collector plate. After the dispensation process, said drop collector plate will have to be brought again under the dispenser head. This system can be conveniently operated by means of a respective actuator, e.g. a rotary or linear actuator, and two limit switches: one for the "under head" position and one for the "off head" position for dispensing the fluid.

By way of example, the material used for manufacturing one or more parts of the dispenser head can be chosen among metals or plastics .

With reference to the preferred variant illustrated in Figures

8a-c, the following is included:

a mobile portion 48 adapted to take a closed position, in which air is prevented from flowing towards the terminal hole 16 from the outside, and a dispensing position, in which fluid can be dispensed through the terminal hole 16 into a container; and

a suction device for sucking the air between the mobile portion 48 and the terminal hole 16 when the mobile portion 48 is in the closed position.

In this manner, additional protection can be provided against fluid drying. In fact, while air is being sucked, any residual drops will be sucked as well, which may have formed at the exit of the terminal holes 16 at the end of the fluid dispensation operation. Conveniently, the suction device can substantially create a vacuum. In the closed position, the mobile portion 48 creates a sealed chamber that houses the terminal holes 16, in which suction occurs.

In the closed position, the mobile portion 48 can, for example, abut against the ring nut 24, the terminal element 14, or the head body 2. In general, the mobile portion 48 lies, in the closed position, on the outlet, thus creating a sealed chamber in which suction occurs.

Preferably, the mobile portion 48 is configured for rotating, in particular about an axis substantially parallel to the axis x-x, and for translating, in particular along an axis parallel to the axis x-x. Preferably, between the closed position and the dispensing position, the mobile portion 48 can take an intermediate position in which it 48 is arranged under the terminal hole 16, at a distance therefrom, thus leaving the terminal hole 16 in communication with the outside air.

Figures 8a-c show the operating sequence of the mobile portion 48 between the closed position (Fig. 8a) and the dispensing position (Fig. 8c). Starting from the closed position, the mobile portion 48 moves away from the outlet (in which there are the terminal holes 16) by translating downwards into the intermediate position (Fig. 8b) . Then the mobile portion 48 rotates, thus clearing the space under the terminal holes 16 and allowing the fluid to be dispensed into the container. When dispensation is over, the mobile portion 48 will return into the closed position.

In particular, a shaft 50 is included for guiding the motion of the mobile portion 48. The shaft 50 is constrained to the mobile portion 48 through a first constraining element 52, in particular a band. The shaft 50 is movably mounted to the head body 2 (in particular, to the lower half-body 2b) through a second constraining element 54, in particular a band. The shaft 50 is adapted to slide and rotate relative to the second constraining element 54. The axis of the shaft 50 is substantially parallel to the axis x-x.

In the illustrated example, the mobile portion 48, during the transition from the intermediate position (Fig. 8b) to the dispensing position (Fig. 8c), makes simultaneous turning (in particular, around the axis of the shaft 50) and lowering motions. In other words, the mobile portion 48 makes a substantially helical movement. The second constraining element 54 has a through hole that houses the shaft 50. In said through hole a guide 56 is formed, in which a pin 58 protruding from the side surface of the shaft 50 slides in a guided manner. The guide 56 comprises a vertical straight first tract and a curvilinear second tract. With reference to the drawings, the shaft 50 is lowered and raised; the pin 58 slides in the guide 56, thus causing rotational or rotational-translational motion of the mobile portion 48. For example, when the mobile portion 48 is in the closed position (Fig. 8a) , the shaft 50 is pushed downwards, so that the pin 58 slides in the (vertical) straight tract of the guide 56; thus, the mobile portion 48 is brought into the intermediate position (Fig. 8b) by simply translating vertically downwards. The shaft 50 is then further pushed downwards, so that the pin 58 slides in the curvilinear tract of the guide 56; thus, the mobile portion 48 is brought into the dispensing position (Fig. 8c) by making the aforementioned helical movement. When fluid dispensation is complete, the shaft 50 is pushed upwards to bring the mobile portion 48 into the closed position. The shaft 50 can be operated either manually or by means of an actuator, e.g. an electric, hydraulic or pneumatic one.

Preferably, the mobile portion 48 has an upper part 60 and a lower part 62 separable from each other. The upper part 60 is secured to the first constraining element 52. In particular, the lower part 62 is screwed to the upper part 60. Conveniently, between such parts 60, 62 a gasket 64, e.g. an O-ring, is interposed to ensure fluid tightness. Between such parts 60, 62 a removable fluid collector 66 is conveniently interposed, e.g. a sponge, a cartridge, a tray, etc., for collecting any excess drops of fluid. After use, the fluid collector 66 may be either reused (e.g. after having been washed or drained) or disposed of and replaced with a new one.

The mobile portion 48 has a suction port 68 through which air is sucked in. In the illustrated example, said suction port 68 is located in the bottom part 62, in particular in a central position thereof. The suction port 68 can be connected to the suction system, e.g. by means of a tube, e.g. a flexible tube.

With reference to Figure 8b, when the mobile portion 48 is in the intermediate position, said mobile portion 48, in particular the upper part 60, lies at a distance from the terminal hole 16, e.g. a distance of 4 to 6 mm. This will prevent any residual drop from crawling on the mobile portion 48 as the latter is turning between the dispensing position and intermediate position; this makes it possible to keep the outlet cleaner and to avoid any undesired mixing of different colours, which might spoil the quality of the hue of the final coloured fluid.

Preferably, the upper part 60 comprises at least one suction duct

70 adapted to place itself at a respective terminal hole 16 when the mobile portion 48 is in the closed position. Through the suction duct 70 air is sucked. It is thus possible to collect any drops of fluid hanging from the terminal hole 16 at the end of the dispensation operation (see Fig. 8b, wherein the drop is designated as G) . Such drops will flow through the suction duct 70 and then deposit into the fluid collector 66.

The invention also relates to a dispensing machine for fluids, in particular, paints, which comprises a dispenser head according to the invention. For example, upstream of the dispenser head there are tubes connected to a dispenser valve and to a pumping system, and a tank for the respective fluid.

Of course, without prejudice to the principle of the invention, the forms of embodiment and the implementation details may be extensively varied from those described and illustrated herein by way of non-limiting example, without however departing from the scope of the invention as set out in the appended claims.