Cone Winding Machine

Anti-patterning of Ribbon Breaking can be achieved by stopping the motor for a fraction of a second and restarting immediately, thus varying the speed without any loss of productivity. It is normally necessary to stop and start the motor about 50 times in a minute, i.e. 3000 times an hour. The OFF period in a cycle of 1.2 second is a fraction of a second. The motor gives the starting kick every time.So far Ribbon breaking has been achieved by a mechanical cam arrangement operating the electrical contactor by means of limit switch in the control circuit. In some developed countries they are using a stable multivibratora giving 50 signals per minute, operating without cam arrangement or limit switch. However, electrical contactor even in AC3 duties is rated for 750 cycles per hour. The requirement of Ribbon Breaking is about 3,000 cycles per hour. For a three working shift for a total of 22.5 hours a day 26 days a month, the motor must be started 21.06 million times a year or for round the clock working 26.28 million times a year. At their best the contact are guaranteed for 11 million mechanical and 2.5 million electrical operations only at AC3 duties.For obvious reasons, no mechanical or electrical or electromechanical device can work under these severe conditions. These involve a large amount of maintenance and frequent repairs and replacements. Due to these reasons these systems have been abandoned or are non-operative on many of the winding machines. Thus, it will be necessary to change the contacts every month and the contactor every three or four months, inspite of over-rating the contactor, involving higher initial investment.