Abstract
Using a device made for a trial to record continuously the drawing force Fd, produced along a seam by worker's fingers, Fd diagrams were obtained. Analyzing these diagrams, the mechanical properties of cloths related to Fd were found. Then the differences of Fd between pre- and after-shrunk cloths were discussed. The results were obtained as follows :
In Fd, (1) the force constricting the interpenetrated sewing needle with the sewn cloths and (2) the force flattenning out crumpled cloths on the needle being held in the sewing-worker's right palm are concerned. (1) has some connections with dia. of sewing needle, stitch length, density of cloths, Young's modulus of cloths, and c with stitch length, bending rigidity and hysteresis of bending moment of cloths. High correlations between these factors and Fd were observed.
By the shrinking treatment, density, bending rigidity and hysteresis of bending moment of cloths decrease and Young's modulus of cloths increases. But, as the contribution of Young's modulus to Fd is smaller than those of other properties, Fd of shrunk cloths result smaller values than those of unshrunk ones, when the cloths sewn with the same stitch length using the same size of needle.
