Actuating device, in particular for ink jet printheads with cooling system

1. An actuator device, in particular for ink-jet printheads, comprising:

two or more electromagnetic actuators or solenoids (S), each comprising a ferromagnetic core ( 2 ) and a conductor winding or coil ( 4 ), arranged concentrically to the ferromagnetic core ( 2 );

a containment body ( 5 ), which encloses the solenoids (S);

characterized in that the containment body ( 5 ) is provided with at least one cooling conduit ( 6 ), wherein the cooling conduit ( 6 ) is formed on an outer lateral surface of the containment body ( 5 ), and wherein the cooling conduit ( 6 ) is delimited at least partly by an outer cover ( 7 ).

2. An actuator device according to claim 1 , wherein the conduit ( 6 ) laps the solenoids (S).

3. An actuator device according to claim 1 , wherein the conduit ( 6 ) exhibits a development with opposing lugs, with rectilinear portions ( 61 ) that are parallel to the solenoids (S).

4. An actuator device according to claim 1 , comprising two conduits ( 6 ) arranged at two opposite side surfaces of the containment body ( 5 ), on opposite sides of the solenoids (S), each delimited by an outer cover ( 7 ).

5. An actuator device according to claim 1 , comprising an insulator element ( 1 ) for each solenoid (S), wherein each insulator element ( 1 ) is made of a magnetic material and is disposed at least partially in proximity of a respective ferromagnetic core ( 2 ).

6. An actuator device according to claim 5 , wherein each insulator element ( 1 ) comprises two longitudinal portions ( 11 ) that are parallel and opposite one to another.

7. An actuator device according to claim 6 , in which each solenoid (S) is placed in the space between the longitudinal portions ( 11 ) of the respective insulator element ( 1 ).

8. An actuator device according to claim 7 , wherein the longitudinal portions ( 11 ) are arranged at a pre-determined distance from the respective solenoid (S).