Machine for dry decoration of ceramic tiles, with a control system for a ceramic mixture accumulation

A machine for dry decoration of ceramic slabs or tiles, comprising:

• a deposit plane (50);
• a distributor unit (D), configured to dispense, in a controlled manner, a ceramic compound in granular or powdered form;
• a storage container (F), interposed between the distributor unit (D) and the deposit plane (50) to store a certain amount of ceramic compound dispensed by the distributor unit (D), and comprising an unloading opening (O) configured to allow the deposit of the ceramic compound on the deposit plane (50);
• wherein the storage container (F) and the deposit plane (50) are in relative movement with respect to one another along a longitudinal direction (Y);
• a control module, connected to the distributor unit (D) and configured to control and regulate the dispensing of ceramic compound by the distributor unit (D);
• one or more sensors (S), connected to the control module and configured to detect a significant parameter of the amount of ceramic compound contained in the storage container (F) and to process a corresponding measurement signal;
• wherein the control module is configured to regulate the dispensing of ceramic compound as a function of the measurement signal received, so as to maintain a desired amount of ceramic compound inside the container (F),
• wherein the distributor unit (D) comprises a dispensing device (E) equipped with a plurality of dispensing nozzles (N), each of which is provided with a shutter device, which are configured to be activated between a flow configuration, in which the dispensing of a ceramic material is determined, and a stop configuration;
• wherein each shutter device is controlled by the control module independently of the other shutters;
• wherein the distributor unit (D) comprises an intermediate deposit element (10), provided with a plurality of cavities (11), positioned above the deposit plane (50) and below the dispensing device (20);
• wherein each cavity (11) has an opening which allows the entry of the powdered material and a subsequent unloading of the powdered material previously introduced;
• wherein the distributor unit (D) comprises an unloading device (30), configured to move the cavities (11) from a loading position, in which they can receive the powdered material from each dispensing device (E) to an unloading position, in which they can unload the powdered material downwards;
• wherein the plurality of dispensing nozzles (N) are aligned to form a bar arranged parallel to a transverse direction (Z) that is perpendicular or inclined with respect to the longitudinal direction (Y);
• wherein each shutter device is configured to be activated between the flow and stop configurations due to a pneumatic command;
• wherein the control module is configured to regulate the pneumatic command to each shutter device;
• and
• wherein the measurement signal produced by each sensor (S) is used to command a number of respective dispensing nozzles (N) that are substantially aligned with said sensor (S) within two vertical planes that are parallel to the longitudinal direction (Y) and separated by a predetermined distance.