Design and realization of yarn carriers control method for high performance computerized flat knitting machine

For the validity of yarn carries control on computerized flat knitting machines,this paper presents a design approach of secondary control combined with PC104 module and FPGA.The host computer software analyzes pattern files to get control data and utilizes the PC104 bus to transfer them to the slave computer.FPGA uses serial comparison method,stores the positioning data of yarn carries to the buffer,and then,being driven by the clock,takes them out in turn and compares with the current positions on the machine head,thus achieving up to 32 yarn carries scheduling.Application results prove that this method makes full use of the strong processing capacity of the PC104 module and FPGA,and the structure of the double buffer memory design and serial comparison way effectively improve the data throughput rate,and make yarn carries scheduling stable and extensible and FPGA resource consumption smaller.Therefore,it has high practical value.