Fabric Sewing:Part 2 : An Analysis on the Penetrating Force of the Sewing Machine Needle through Polypropylene Film

概要

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In previous paper, measuring needle temperature and sewing thread damage due toneedle temperature, in dynamic high speed sewing, have been discussed, and were mainly reported that needle temperature rises to a high degree and consiquently sewing thread damage is extremely large. In this case, it is necess-ary to obtain the acknolegements on the energy which is convertible into needle temperature. And in this paper, the diagram of the penetrating force of the sewing machine needle through fabrics (polypropylene film) is discussed. The results obtained as follows. (1) The diagram of the penetrating force of the needle culculated from the equations (5) ', (6) ', (9) 'and (7) agrees well with the measured ones. (2) The penetrating force takes the maximum value at l=b, here, l is the interpenetrated length of the needle from the surface of the fabric and b is the height of the circular cone on the pointed head of the needle. (3) The force K, acting on the needle part buried in the fabric in the perpendicular direction to the axis of the needle, increases linearly in the region lb. (4) On the phenomena during extremely short time in case of penetrating of needle through fabrics, It is thinkable that the stress of fabrics takes no account of the relaxation. And, the curves of l-K take a superposition regardless of machine speed.
社団法人日本繊維機械学会の論文