Relation between Heald Motion and the SoundCaused by Shedding Motion on Weaving Machine

Abstract

It is well known that weaving mills become noisy with increasing speed of a jet loom. One of the authors used the heald frames equipped with bar magnets in order to reduce the heald vibration, and reported that the disorder of the heald motion during shedding motion was improved. Then, sound heard by human ears seemed reduced, but there was no significant difference in the noise level measured with the noise-level meter.In this report, therefore, the high response sound measuring system was arranged in order to obtain the time chart of sound pressure level caused by healds during shedding motion. High-speed video-camera was also used in order to observe the healds motion. It was clarified that the noise was significantly connected with healds motion during shedding motion. Large sound occurred in two cases : when healds collided with the heald bar vertically near the upper dead point of shedding motion and when healds collided at random by rebounds around the lower dead point of shedding motion.