Patent ID: 11891264
Assignee: JEAN-MICHEL LIBEAU
Field: Handling (Mechanical engineering)
Classification: CPC B  D | IPC B  D

Claim 0:
1. A system for producing a yarn comprising at least two continuous filaments and a plurality of staple fibres that form a roving, wherein the system comprises at least one filament feed system configured to apply a predetermined amount of tension or no tension to the at least two continuous filaments before the at least two continuous filaments are introduced to the roving or to cause the at least two continuous filaments to be introduced to the roving under slack;
wherein the filament feed system comprises: two driven rollers; two press rollers; and two drive systems, wherein each press roller is configured to press against a respective driven roller and press at least one filament therebetween, and wherein each drive system is operatively connected to one of the driven rollers to cause that driven roller to rotate at a desired predetermined speed, and each drive system comprises a programmable controller to control and vary the rotational speed of one of the driven rollers; and
wherein the filament feed system also comprises a closed feedback loop in which the filament feed system comprises one or more sensors to measure the rotational speeds of the driven rollers, wherein the one or more sensors are configured to provide the measured rotational speed data to the drive systems, and wherein each drive system comprises a controller that compares the desired rotational speed with the measured rotational speed of the driven roller and causes the drive system to adjust the rotational speed of the driven roller to equal the desired rotational speed, if the measured rotational speed is different to the desired rotational speed of the driven roller.