Method of crimping terminal and apparatus for the same

A method of crimping a terminal barrel to a wire laid on an anvil by a crimper driven by a servo-motor through a piston crank mechanism having an off-center pin, the forward and reverse rotations of said servo-motor vertically reciprocating said crimper, said method comprising:

• preliminarily recording reference speeds or accelerations of said crimper at vertical positions of the reciprocating movement thereof, and the reference value of a current which is supplied to said servo-motor when the terminal is crimped;
• descending said crimper at the recorded reference speeds corresponding to the crimper positions while said crimper descends from its top position to its crimping start position;
• crimping said terminal when the off-center pin is positioned at an intermediate position between its top dead point and its bottom dead point by supplying said servo-motor with said recorded reference current for a predetermined prolonged period sufficient to prevent spring back of said terminal barrel.