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A non-linear numerical simulation of a standard procedure for textile flexibility testing is performed using discretised beam bending model. Geometric non-linearity due to large deflections is traced using incremental method. Linear moment-curvature response is assumed, as well as constant curvature of a finite element of the beam. Numerical procedure is incorporated into a PC programme producing graphical results for the deformed shape of the specimen, non-linear load-deflection diagrams and internal force distributions in deformed state. Finally, the method is applied to compute the flexural stiffness of textile materials from the data produced by the standard procedure for flexibility testing. [ABSTRACT FROM AUTHOR]

The procedure of computerised automatic construction of a cutting pattern for men's shirt is presented. It is based on the calculation of construction measures necessary for the calculation of all the construction elements. The procedure of construction is similar to the conventional hand procedure, but is done using a computer, so that the locations of the co-ordinates of all the principal and auxiliary points on cutting part contours are calculated. Straight segments are drawn afterwards through these calculated points and curved segments interpolated. [ABSTRACT FROM AUTHOR]

An investigation is presented of the impact of mechanical auxiliary devices on sewing-machines upon the processing parameters of sewing operations. Processing parameters are investigated at an ergonomically designed workplace, on a modern sewing-machine, equipped with a processing microcomputer. Measuring samples are 300 to 1,000mm long, and stitching speeds are pre-programmed – 1,500 to 4,700rpm. 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 the basic time needed to perform the sewing operation is reduced by up to 61.2 per cent, while the use of a hemmer reduces it by 38.3 per cent. Specific time for sewing 1m 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 a tape piper from 1,041 to 3,914rpm, and from 1,176 to 3,959rpm 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 the processing parameters involved. [ABSTRACT FROM AUTHOR]

The development of the equipment for investigating operative logical movement groups in garment production is presented. The characteristics of the equipment and software packages used are described, as well as the processing of the video recordings, from recording at the workplace, marker separation to marker system chain-linking, which, as a final result, are used in the course of logical movement group defining. [ABSTRACT FROM AUTHOR]

A measuring system for automatic process parameter acquisition in garment sewing operations has been presented. The measuring equipment is based upon the usage of a very powerful portable notebook IBM compatible personal computer, equipped with an AD converter, measuring instruments and adequate software packages for data storing and analysis. Characteristics of measuring instruments and sensors have also been given, together with measuring process description, all connected with two independent video-camera systems, working in two planes, used for working operation analysis at workplaces in garment sewing operations. [ABSTRACT FROM AUTHOR]

Presents the possibility of determining increased numbers of processing parameters for garment sewing using numerical methods and computers. The determination of new parameters has been made possible by employing equipment designed to measure stitching speed and to store the data in a computer as a function of time. Mathematical operations of searching and calculating, and numerical methods of derivation or integration can be applied to the measured pairs of data concerning the stitching speed and time period. In this way, the values of new processing parameters can be obtained, or their function flows investigated. [ABSTRACT FROM AUTHOR]