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A gravimetric dosing apparatus includes a support frame, a plurality of loading hoppers for a respective granular material to be dosed, carried by the support frame and provided with a respective discharge outlet and an opening-closing device for their respective discharge outlet. A weighing hopper

A gravimetric dosing apparatus includes a support frame, a plurality of loading hoppers for a respective granular material to be dosed, carried by the support frame and provided with a respective discharge outlet and an opening-closing device for their respective discharge outlet. A weighing hopper includes a discharge outlet and an opening and closing device for its respective discharge outlet and arranged in cascade with respect to the loading hoppers to receive from at least two of the hoppers dosed quantities of different granular materials. A support element is articulated to the frame and designed to overhangingly support the weighing hopper. Transducing structure generates output signals proportional to the weight of the material discharged into the weighing hopper. A mixing assembly receives the dosed and weighed granular material, and a program control unit receives input signals from the transducer and program controls the opening-closing devices.

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The invention claimed is: 1. A gravimetric dosing apparatus comprising: a support frame; a plurality of loading hoppers for a respective granular material to be dosed, each carried by said support frame and provided with a respective discharge outlet and an opening-closing device for their respecti

The invention claimed is: 1. A gravimetric dosing apparatus comprising: a support frame; a plurality of loading hoppers for a respective granular material to be dosed, each carried by said support frame and provided with a respective discharge outlet and an opening-closing device for their respective discharge outlet; inclined calibration flaps disposed at each loading hopper discharge outlet, the calibration flaps being sized and positioned to prevent material discharged by the hoppers from falling out laterally of the respective opening-closing device; a weighing hopper including a discharge outlet and an opening and closing device for its respective discharge outlet and arranged in cascade with respect to said loading hoppers to receive from at least two of said hoppers dosed quantities of different granular materials; a support element articulated to said frame and designed to overhangingly support said weighing hopper; transducing means located outside said frame between said frame and said articulated support element and designed to generate output signals proportional to the weight of the material discharged into said weighing hopper; a mixing assembly carried by said support frame and arranged in cascade with respect to said weighing hopper, whereby dosed and weighed granular material is received therefrom; and a program control unit that receives input signals from said transducer means and that program controls said opening-closing devices, wherein each of said opening-closing devices comprises a pair of opening and closing bucket-like elements articulated to one another about a common articulation axis, a reciprocating actuator means, and a fork-shaped linkage member having one fork-shaped end pivoted to said bucket-like elements, respectively and having an opposite end pivoted to said reciprocating actuator means, thereby obtaining short response times of said opening-closing device. 2. An apparatus according to claim 1, wherein each opening-closing device comprises an electrovalve including a pair of driving solenoids and fixed underneath to a wall extension of its respective hopper, an opening being formed in said extension at each of said solenoids. 3. An apparatus according to claim 1, wherein said support element is inclined inside said frame with respect to a vertical line. 4. A gravimetric dosing apparatus comprising: a support frame; a plurality of loading hoppers for a respective granular material to be dosed, each carried by said support frame and provided with a respective discharge outlet and an opening-closing device for their respective discharge outlet; a weighing hopper including a discharge outlet and an opening and closing device for its respective discharge outlet and arranged in cascade with respect to said loading hoppers to receive from at least two of said hoppers dosed quantities of different granular materials; a support element articulated to said frame and designed to overhangingly support said weighing hopper; transducing means located outside said frame between said frame and said articulated support element and designed to generate output signals proportional to the weight of the material discharged into said weighing hopper; a mixing assembly carried by said support frame and arranged in cascade with respect to said weighing hopper, whereby dosed and weighed granular material is received therefrom; and a program control unit that receives input signals from said transducer means and that program controls said opening-closing devices, wherein each of said opening-closing devices comprises a pair of opening and closing bucket-like elements articulated to one another about a common articulation axis, a reciprocating actuator means, and a fork-shaped linkage member having one fork-shaped end pivoted to said bucket-like elements, respectively and having an opposite end pivoted to said reciprocating actuator means, thereby obtaining short response times of said opening-closing device, and wherein said mixing assembling comprises an inner chamber having a hemispherical lower portion, a mixer unit having a pair of perforated and juxtaposed spiral members and mounted for rotation about an axis of rotation in said hemispherical lower portion, and a motor reduction unit for said mixer unit, whereby upon rotation said mixer unit exerts a lifting action of granular material towards an intermediate zone of said inner chamber, while laterally discharging granular material, with some granular material flowing through the perforated and juxtaposed spiral members. 5. A gravimetric dosing apparatus comprising: a support frame; a plurality of loading hoppers carried by the support frame for housing a respective granular material to be dosed via a respective discharge outlet, each of the loading hoppers including an opening-closing device that selectively opens and closes the respective discharge outlet, wherein each opening-closing device comprises a pair of opening and closing bucket-like elements articulated to one another about a common articulation axis, a reciprocating actuator, and a fork-shaped linkage member having one fork-shaped end pivoted to the bucket-like elements, respectively and having an opposite end pivoted to the reciprocating actuator; inclined calibration flaps disposed at each loading hopper discharge outlet, the calibration flaps being sized and positioned to prevent material discharged by the hoppers from falling out laterally of the respective opening-closing device; a weighing hopper arranged in cascade with respect to the loading hoppers to receive dosed quantities of different granular materials; a transducer operatively coupled with the weighing hopper and disposed outside of said support frame, the transducer generating output signals proportional to the weight of the material discharged into the weighing hopper; a mixing assembly arranged in cascade with respect to the weighing hopper; and a program control unit that receives signals from the transducer and that program controls the opening-closing devices.