小学校家庭科教材における縫い方と縫い糸の関係についての実験的一考察

抄録

An experimental study on the relation of various stitches and threads has been made as an aid in teaching "basic hand stitches" scientifically in homemaking classes in elementary schools. Cotton broad fabric, both warp and filling 40/2S, has been used. Threads used are Komachi thread, Tokyo thread and sewing machine threads. Kinds of stitches tested are running stitch, semi-back stitch, back stitch, and sewing machine stitch. Experiments have been made, with the following results, on the use or non-use of "chikara-nuno" (cloth for reinforcement), on the strength of various stitches with the threads mentioned above, and on the breaking condition of stitches by pulling. Stitch strength has been measured by the Autograph-P-100, and the strength of threads by Tensile Testing Machine, both by Shimazu. 1. Stitch strength is great when Komachi thread, Tokyo thread, #30 or #40 cotton thread is used in back stitch. Sewing machine stitch is also strong when #50 cotton thread is used. 2. Of the stitches made by school chidren, the strength is higher when the stitches are smaller, even and straight. 3. It has been confirmed by the study of breaking condition that Komachi thread is best suited for the cotton broad fabric. The usefulness of "chikara-nuno" has also been confirmed. 4. When teaching stitches to school children, the combination of various stitches and threads must be considered collectively, paying due attention to the kinds of stitches and threads and also to the stitch strength and breaking condition. 5. The data obtained might be of some use when teaching basic hand stitches scientifically in elementary school homemaking classes.