engleski

The impact of auxiliary devices on sewing-machines upon processing parameters of sewing operations

An investigation is presented of the impact of mechanical auxiliary devices on sewing machines upon processing parameters of sewing operation. Processing parameters are investigated at an ergonomically designed workplace, on a modern sewing machine, equipped with a processing microcomputer. Measuring samples are 300 to 1,000 mm long, and stitching speeds are pre-programmed – 1,500 to 4,700 rpm. Values for sewing operation processing parameters are measured and stored using the measuring system for processing parameters MMPP, developed especially for the purpose of research in the field of garment engineering. The results obtained indicate that using a tape piper basic time needed to perform the sewing operation is reduced up to 61.2 per cent, while the usage of a hemmer reduces it by 38.3 per cent. Specific time for sewing 1 m of seam is reduced using the above auxiliary devices as follows: by 64.5 per cent using a tape piper and by 41.8 per cent using a hemmer. The degree of sewing machine utilisation is increased by 110.6 per cent using a tape piper, and by 59.8 per cent using a hemmer. Average stitching in machine-hand sub-operations is increased with tape piper from 1,041 to 3,914 rpm, and from 1,176 to 3,959 rpm with a hemmer. The operation structure is altered by using auxiliary devices, achieving rationalisation of the movements constituting auxiliary- hand sub-operations, which has a considerable impact on processing parameters involved.

garment; technology; sewing; sewing-machines

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