Some Behaviours of a Heald Frame in Increaing Loom Speed

Abstract

The investigation was planed to observe some mechanical behaviours of heald frame, e.g. acceleration and vibration of the frame for obtaining fundamental data to develop a highspeed dobby up to 1 000 rpm in loom- speed. In order to carry out the investigation planned, a positive and negative shedding device were used as the apparatus. The main results obtained were as follows : 1) To increase the shedding speed, the positive system was more suitable then the nagative one.2) The warp used was uneffective to redusce a vibration of the frame.3) The heald frame movement produced by a cycloid cam could not show a better performance comparirng with that of a simqle harmonic motion camin the higher speed range used.4) To increase the shedding speed, a standstill angle of the shedding cams was undesirable. ring than