second hand tailoring machine in chennai, perambur, mylapore, madipakkam - VS SewingMachine
second hand tailoring machine in chennai, perambur, mylapore, madipakkam - VS SewingMachine
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The measurement of vibrations is an important technique for the in-service evaluation and monitoring of machines and civil structures. For such measurement, optical fiber sensors are very promising candidates as optical fibers are electromagnetic interference- and hazard-free and their use enables the sensors to be operated remotely with the electronics and electrical connections situated away from the sensing sites, which is a major advantage in many applications. In this work, multimode optical fiber sensors are used to monitor the vibrations of an industrial sewing machine. The measurement is based on vibration sensing using multimode interference in a proposed sensor configuration which is simple in construction and straight forward to operate. The principle of operation, the results obtained and suggested further investigations of the proposed sensors are discussed.
Two types of sensors were used to measure the above stated parameters: 0 Piezoelectric washers Nstler) were built directly into the needle and presser-foot bars to measure force on these components; 0 The sensing of thread tensions was achieved measuring the strain in cantilever beams put into the thread paths, as close as possible to the needle and looper Hsw embroidery machine in chennai , perambur, mylapore, madipakkam
Since quick variations on all of these parameters were expected, it was necessary to select components with a proper bandwidth. The piezoelectric sensors selected have a resonant frequency in the order of 200 KHZ, which lies very much above the maximum working frequency of the machine (7500 rpm = 125 Hz). In the case of the thread tension sensors, semiconductor strain gages were used to measure the strain produced in the beam. Calculation of the dimensions of a beam with a natural frequency of 5 KHz or above showed that the strain produced on its surface for the expected force values (max. 500 cN) would be too small to be picked up adequately by resistive strain gauges. Semiconductor strain gauges were used instead. This kind of strain gauge has a poorer performance concerning temperature drift and electromagnetic interference, but a much higher sensitivity. The sensor, manufactured by a Czech development institute, revealed to have very low temperature and mechanical drift, good frequency response and sensitivity.
