Digital printing device with enhanced nozzle plate's cleaning system

1. A digital printing device, comprising:

a fixed frame;

a support portion;

a plurality of printing modules that are integral with said support portion and equipped with at least one print head, whose nozzle plate faces, in use, a printing area underlying the plurality of printing modules;

wherein said digital printing device is arranged to print onto a printing medium that is relatively movable with respect to the fixed frame through said printing area in an advancement direction;

wherein said plurality of printing modules follow each other along a longitudinal direction that is parallel to said advancement direction;

said digital printing device comprising a cleaning bar, extended in the longitudinal direction, spanning below said plurality of printing modules and translationally movable in a transverse horizontal direction that is orthogonal to the longitudinal direction;

said cleaning bar comprising a bar body that supports a plurality of cleaning heads, each of them being arranged to clean the nozzle plate of a specific printing module of said plurality of printing modules;

wherein said plurality of cleaning heads are supported in a floating manner by the bar body, so as to adapt their own height to an overlying printing module of said plurality of printing modules.

2. The digital printing device according to claim 1 , comprising elastic members acting on each of said plurality of cleaning heads to keep them in contact with said overlying printing module of said plurality of printing modules.

3. The digital printing device according to claim 2 , wherein at least two distinct elastic members act on each of said plurality of cleaning heads, at two application points separated from each other.

4. The digital printing device according to claim 3 , wherein each of said plurality of cleaning heads has a prevalent extension in the longitudinal direction, said application points of the elastic members being spaced along said longitudinal direction.

5. The digital printing device according to claim 4 , wherein each cleaning head of said plurality of cleaning heads comprises, at the opposed ends, two eyelets fit into respective vertical pins that are integral with the bar body or, vice versa, each cleaning head of said plurality of cleaning heads provides at the opposed ends two vertical pins fit into respective eyelets of the bar body; said compression springs being placed around said pins.

6. The digital printing device according to claim 2 , wherein said elastic members are compression springs interposed between said bar body and a stop surface of each of said plurality of cleaning heads.

7. The digital printing device according to claim 6 , wherein each of said plurality of cleaning heads comprises at least one eyelet fit into a vertical pin that is integral with the bar body or, vice versa, said bar body comprises an eyelet fit into a vertical pin that is integral with each of said plurality of cleaning heads, said compression springs being placed around said pins.

8. The digital printing device according to claim 1 , wherein each cleaning head of said plurality of cleaning heads comprises at the top an operating portion intended to face, in use, the nozzle plate.

9. The digital printing device according to claim 8 , wherein said operating portion is a suction opening connected to a suction device.

10. The digital printing device according to claim 9 , wherein said operating portion is a suction slot extended in the longitudinal direction.

11. The digital printing device according to claim 9 , wherein each cleaning head of said plurality of cleaning heads has a box-like body in fluid communication with a suction manifold that is integral with the bar body.

12. The digital printing device according to claim 8 , wherein each cleaning head of said plurality of cleaning heads comprises at the top at least one contour follower intended to contact a respective lower surface of said overlying printing module of said plurality of printing modules, said lower surface being distinct from the nozzle plate; and wherein each cleaning head of said plurality of cleaning heads comprises two contour followers located at the opposed ends of said operating portion.

13. The digital printing device according to claim 1 , wherein each cleaning head of said plurality of cleaning heads comprises at the top at least one contour follower intended to contact a respective lower surface of said overlying printing module of said plurality of printing modules, said lower surface being distinct from the nozzle plate.

14. The digital printing device according to claim 13 , wherein said at least one contour follower is a roller.