Knitting machine, yarn processing method of knitting machine, yarn processing control device of knitting machine and program thereof

A knitting machine, a method of working yarn by the knitting machine, and a controller for working yarn by the knitting machine and its program. In the method, a carriage is controllably stopped at a point where a yarn passage length between a yarn working device and a knitting needle obtained by assuming that a buffer length on a tension arm is maximum matches a residual knitting length left before knitting at a point where yarn working is performed. When the carriage is stopped, the buffer length of a first arm is measured, a yarn is delivered from the yarn working device by an amount of difference between the buffer length and the maximum value thereof, and the yarn is worked in synchronism with the application of a tension to the yarn by releasing a second arm. Thus, the yarn can be worked at specified positions.