Moment analysis of needle bar mechanism on computerized embroidery machine

Aiming at the problems such as embroidery quality and thread breaking resulted from the beam shaking,the paper,starting from reducing the size of needle bar mechanism,deduces a calculation formula for the shake movement of the needle bar based on the theory of angular momentum,and analyzes two kinds of oscillatory torque in two conditions,i.e.,the needle bar in force imbalance and in force balance.Then the values of the moment are worked out accurately and two curves of the oscillatory torque are plotted from using MatLab as computer tool.It is shown from computed results that the needle bar in force balance can not reduce the shake of the beam but enhance it.The data obtained can be applied to improve the design of needle bar mechanism.