Thick and Thin Places in Fabrics during Weaving

Abstract

The purpose of this article is to develop a utilized device for preventing the thick and thin places in fabrics with the aid of the theoretical and experimental results obtained in previous reports.The ability of the developed device has been looked into with the following results:(1) The warp tensioning device comprising a whirl spring has a higher ability than that of the coiled spring system.(2) The following two kinds of preventive devices against “set mark” have neen manufactured. One is of (i) the restraint type which restrains the tension roller only when the loom starts or stops; and or which does not restrain it only when the loom starts or stops. The other is of (ii) the contsraint type which pulls the easing roller positively only when the loom starts or stops.(3) The devices showed a high degree of ability to prevent the “set mark” on the loom in which the shedding time is at top center or front dead center.(4) The “set mark” on the water jet loom is not only caused by the difference in tension curve between the stop and start and the stationary running state, but also by the difference in the bending of the race. The latter has a greater influence.(5) The device on the water jet loom is in principle based on the restraint type which is usable on the automatic cotton loom. It can satisfactorily eliminate the “set mark” caused by the difference in tension curves between the stop and start and the stationary running state.(6) The compensating device for the pick spacing by pushing the pedal is useful for relieving the “set mark” caused by the difference in the values of the bending of the race.