Computing the Sewing Time and the Determining how to Drive Industrial Sewing Machines
Computing the Sewing Time and the Determining how to Drive Industrial Sewing Machines

Summary/Abstract: A clothing engineer has to know the importance of the sewing time in correlation with the characteristics of the sewing machine and how to decide if the worker controls the industrial sewing machines properly. During the sewing process, the productivity of its specific operations depends on: the time of usage of the sewing machines; the complexity of the sewing operation, the operator's skills and the technical characteristics of the sewing machine. The sewing time is the one in which the sewing capacity of the machine is used to the full extent if the usual operating speed is attained. A sewing operation involves interruptions and repositioning the piece, specific movements which lead to the interruption of the sewing process and cause the machine to idle. During the sewing process, the speed of the main shaft of the machine varies continuously, depending on the shape of the sewing contour. If the shape of the sewing lines is not too complicated, the worker can increase the speed of the machine to its maximum values at certain times (when the machine runs across seams on the long lengths and straight lines). The speed of the sewing machine can be negatively influenced by the losses caused by the empty strokes of the machine. In this paper, the authors explain a method of assessing the qualitative and energetic index of sewing machines, by taking into consideration the complexity of the sewing operation, the worker's level of qualification and the degree of mechanization. By being provided with video explanations, the students or any technicians acquire a better understanding of how to compute the sewing time, and of how to determine the time and production norms, for different sewing operations.

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