Printing devices or heads for printers or the like and a process for making such a printing head

In a printing device for a printer having an assembly of needles and respective control means for each of said needles one end of each needle being intended to strike an information and support and mark thereon selected points representative of figures, characters or the like, said control means comprising a metal plate and an electro-magnet for displacing said plate when a signal is applied across the winding of the electro-magnet, the displacement being such as to cause the projection of the respective needle towards said support, each electro-magnet of said control means being supported in a base, the improvement wherein each electro-magnet includes a substantially U-shaped element having arms defining a magnetic circuit, said element being separate from said base, the winding of said electro-magnet being disposed around an arm of said U-shaped element, said base having housings for supporting said magnetic circuit elements, and a surrounding material is provided to adhere to said magnetic circuit element and said base, said surrounding material encapuslating each winding and said arm supporting said winding to fix said elements and windings with respect to said base and protect said windings.