Dispensing and dosing machine for dyestuffs

Details Dispensing and dosing machine for dyestuffs Dispensing and dosing machine for dyestuffs

2000-06-27

2001-08-07

Derakshani, Philippe (Department: 3754)

Dispensing

Plural sources, compartment, containers and/or spaced jacket

With selecting means

C222S148000, C222S485000

Reexamination Certificate

active

06269978

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention proposes a dispensing and dosing machine for dyestuffs, paints and the like, equipped with a central unit for simultaneous dispensing of one or more dyestuffs or viscous liquids and a nozzle cleaning system composed of a multiple number of axially sliding pins, moved by a stepwise motor and inserted into the dispensing nozzles from above so as to ensure a complete discharge of the dyestuff and form a seal preventing the liquid in the channels from drying out.
DESCRIPTION OF THE RELATED ART
A number of devices for dispensing and dosing dyestuffs are known, which comprise a multiple number of tanks holding a different dyestuff base each, and dispensing devices capable of dispensing a predetermined quantity of dyestuff. Some electronic systems control these dispensing devices so that each of them supplies the quantity of dyestuff needed to achieve the require tinting after being mixed.
Modern dyestuffs are prepared by mixing a certain quantity of dyestuff base such as for instance white or gray with a small percentage of one or more dyestuffs, in a combination designed to achieve the final tinting required.
These dyestuffs are employed in extremely limited quantities, often just a few drops, which means that a plugging in one or more of the dispensing channels affects the quantity of the discharged material and therefore the final tinting of the product.
Some dosing machines are already known, such as for instance those described in the U.S. Pat. Nos. 4,314,653 and 5,042,699 by the same Applicant.
The patent application of the Italian utility model no. MI96U 0105 describes a dyestuff dispensing machine comprising a multiple number of dyestuff tanks arranged in a radial pattern around a central dispensing head equipped on its lateral wall with a multiple number of radial fittings for connecting to as many supply tanks, and on the bottom wall a discharge outlet connected to said fittings by passages provided inside the head.
The U.S. Pat. No. 5,449,028 describes a dyestuff dispensing device of a type comprising a multiple number of dispensing channels, each connected to a tank and arranged so as to discharge the dyestuff through some nozzles set in the lower wall, which provides for a removable lid for the sealing of said lower wall, shaped in a way to form a tightly sealed chamber surrounding the area for discharging the channels.
This sealing lid has been provided to limit the nozzles' contact with air, in an attempt to prevent or at least retard the drying out of the product left over in the discharge channels.
The dyestuff pastes of a water base or other kind in fact have an extremely limited drying time which is a considerable source of drawbacks, as some plugs of dried-out liquid form inside the dispensing channels and to affect the dispensing process.
This makes it necessary to ensure a rigorous cleanliness of the dispensing channels.
The known systems described above, in particular that of the U.S. Pat. No. 5,449,028 have been developed precisely in the attempt of limiting this drying-out phenomenon.
Despite the fact that appreciable results have been achieved, the problem is still not entirely solved, as even with the use of a sealing lid the dyestuff is still left behind in the channels, and if the machine is left standing for a certain period of time, dries out and re-proposes the problem.
SUMMARY OF THE INVENTION
A solution of this problem is now offered by this invention, which proposes a dispensing and dosing machine of a type comprising a multiple number of tanks directing the dyestuff toward a central dispensing head equipped with dispensing channels, a machine fitted with a number of pins coaxial with the terminal portion of the discharge channels and having the same diameter of the latter, which are inserted into these channels from the top so as to evacuate them completely and simultaneously achieve a tight seal.
This solution thus allows on one hand a complete discharge of the dyestuff without risking their partial entrapment in the channels, and on the other hand prevents the drying out of the material, due to the fact that these pins achieve a perfect seal on the entire surface of the dispensing channels.


REFERENCES:
patent: 4582231 (1986-04-01), Warning, Jr.
patent: 4681741 (1987-07-01), Hanaway
patent: 5911342 (1999-06-01), Sindoni
patent: 5938080 (1999-08-01), Haaser et al.

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