Sewing Machines are arranged dependent on their usefulness, and they have likewise been ordered relying upon their highlights like sewing, knitting and weaving.
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To address some of the problems stated previously, in particular the quick response to small production orders, several new production organization methods have been devised. These are based on higher flexibility and interchangeability of the operators, smaller production units and batch sizes, and higher mobility of the production equipment. But the simple reorganization of production cannot address all issues: the variables related to the production process itself are still not controlled. Set-up of the machines is empirical and thus inaccurate and time-consuming. Initial set-up is maintained during operation regardless changing sewing conditions. Quality is assessed by visual inspection, often causing defective parts to pass unnoticed or to be detected very late.
The developed measurement system is based on a Singer 882 overedge machine configured to produce the three-thread stitch type 504. Several sensors measuring the relevant process parameters have been applied to the machine. The sensors’ signals are conditioned by custom-developed hardware and are then connected to a data acquisition board plugged to the PC. A software package developed in LabView acquires, stores, displays and analyses the signals
The test rig measures sewing process variables related to three different sub-functions of the machine: Needle penetration, fabric feeding and thread interlacing or stitch formation. The pick-up of needle penetration forces is achieved by a commercial piezoelectric sensor (Kistler) that is inserted into the needle-bar.
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