Bull Hn Information Systems Italia S.p.a.

Compuprint Spa

Ettore Quattrini

Andrea Garramone

Roberto Boggio

A needle printing head comprising a support ( ) able to axially guide a plurality of printing needles ( ), each of which has one end attached to a mobile armature ( ) of a corresponding actuation electromagnet ( ) having a ferromagnetic core ( ) provided with polar extensions. A separation element ( ) is interposed between the mobile armatures ( ) and the corresponding polar extensions. The separation element ( ) is made of a metal material and comprises elements ( ) able to reduce the effects of the eddy currents which are generated by the energizing of every electromagnet ( ).

Needle printing head

A dot matrix printing head and related printing apparatus, the print head comprising a plurality of printing electromagnets, each having a magnetic core, an energization winding, a movable armature for actuation of a printing element and a first abutment element defining a first rest position of the armatures, where electrically energizeable means are provided for controlling the position of a second abutment element which defines a second rest position of the armatures, so as to change the air gap width between each armature and the related magnetic core and the stroke of the related printing element, depending on requirement of printing on single copy sheets or multiple copy sheets, and where, in addition to gap adjustment, the duration of the energization time interval of the printing electromagnets, their energization frequency and the advancement speed of the print head relative to a printing medium are modified to achieve the best performances, both when printing on single copy sheet and on multiple copy sheets.

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Binasco, Italy

Ettore Quattrini