| 摘要 |
Armature group for mosaic printing head where each armature (13) which is part of an actuation electromagnet associated to one (8) of a plurality of printing needles, is restrained to an elastic arm (16) of a spring steel spider (17) having as many arms as the armatures are. …<??>Such spider, besides performing an armature positioning function allows to handle the armature group as an unitary element easy to be assembled. …<??>The thrust arm (14) of each armature (8) further presents a double bending in order that the bearing plane between such arm and the corresponding needle head (12) is perpendicular to the needle axis and gets through the armature fulcrum (23). In this way the buckling the needle has to undergo during the actuation phase is minimized. …<??>The armature group can be obtained with a completely automated manufacturing process. |
