US Patent 7585124 Armature structure and dot head

An armature structure according to the present invention is arranged in a manner that two armature members, in each of which a shear plane and a broken-out section are formed by a punching processing on an inner periphery of a through hole into which a fulcrum shaft fits, are joined integrally in a state of sandwiching an arm therebetween so as to position the broken-out sections of the armature members at the outer side. Thus, even by the rotation of the armature structure during a printing operation, there does not arise a problem that the armature structure inclines due to eccentric wear, so that a stable printing state can be obtained for a long term.