(57) Needle printing head improved for an easy assembling comprising a needle guiding
group having a plurality of needles substantially arranged according to an axial direction
and guided by a plurality of diaphragms arranged according to said axial direction
and perpendicularly to it, wherein two contiguous diaphragms arranged at one end of
the needles or at the other one can assume two different axial positions, a working
position and an assembling position respectively and, in the assembling position cause
controlled bending stresses in the needles and generate, by friction, restraint reactions
in axial direction which prevent the axial moving of the needles and lock them in
assembling position, making easier the printing head assembling.
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