Abstract:

This paper investigates into the failures of weft handover at the center of the shed on a rapier loom with two rapiers, which are caused by improper parameter designs or adjusting. It is revealed from theory and experiment that the success chance of weft handover concerns not only the structure and performance of the rapiers, the installation quality of filling insertion equipment and movement of the rapiers, but also parameters set on the process of filling insertion. This paper puts forward the rapier’s condition required for proper weft handover. Under the premise that both the static (nominal) transfer stroke and the static (nominal) overlap angle are greater than zero, it is required to keep the dynamical (actual) transfer stroke and the dynamical (actual) overlap angle greater than zero. The paper also comes up with two concepts, i. e. the optimum handover condition and the optimum handover zone, and points out the sequence and several important points on specifying the parameters on the process of filling insertion.