GB666148A - Attenuation and gathering of glass filaments - Google Patents

Abstract

666,148. Glass yarns. JAROS, E. P. Feb. 8, 1949 [March 4, 1948], No. 3386/49. Classes 120(i), 120(ii) and 120(iii) Glass filaments 14 are drawn from a furnace 11 through a lubricating chamber 16 by two attenuators 21, 22 and delivered as a sliver 23 to a spinning pot 51. Each attenuator comprises an outer rotor 25 having a circumferential groove 30 in which the filaments are congregated to form the sliver. The sliver is held in the groove by suction, the force being exerted, through apertures 31 extending from the base of the groove through the rotor, from a stationary suction chamber 29 enclosed by the rotor 25 which extends for that part of the circumference of the rotor corresponding to the length of contact of the sliver. As the rotor 25 rotates the apertures 31 successively move over the suction chamber 29 whereby the sliver is drawn into the groove 30. To ensure that the sliver readily leaves the groove 30 as it passes to the next attenuator or to the spinning pot, a pressure chamber 28 is provided at the point of disengagement of the sliver and as the apertures pass from the suction chamber over a partition wall to cover the pressure chamber air pressure urges the sliver from the groove 30. The chambers 28, 29 may be adjustably rotated to vary their positions. As the sliver leaves the second attenuator 22. it is initially drawn by air pressure into a waste collector 62. To ensure continuity of tension when the sliver is transferred to the spinning pot 51, a loop of thread 74 is provided, the bight of which is wound round a 'brake roller 75 with the ends extending along guides 73, through a funnel 53 and into the spinning pot 51. The sliver extends through the loop to the waste collector so that as the pot is rotated and the brake roller released the loop is gradually taken up and draws the sliver into the spinning pot. An automatic cutter for severing the end of the sliver extending into the waste collector is provided and operates upon the sliver, being drawn over an electrical contact 82 to operate the release mechanism for the cutter 86. Simultaneously as the cutter operates the air pressure, on the sliver drawing it into the waste collector is shut off. If desired, this loop tensioning arrangement may be used for the transfer of the sliver from one spinning pot to another.