The inventions relates to a yarn nozzle motion mechanism of intarsia shuttle box in flat knitting machine, comprising case, driving plate, limit swing block, fixed plate for yarn nozzle, outer cover plate and is characterized in that it contains cam, extension spring, buffer spring. Driving plate is slipped on the upper end of case outer and cam, limit swing block are articulated on the case outer under the driving plate from the top down orderly. Fixed plate for yarn nozzle is cut into limit swing block and two ends of extension spring are connected to fixed plate for yarn nozzle and limit swing block respectively. One end of two buffer spring is fixed to two sides of limit swing block and the other end is leaned against two sides of fixed plate for yarn nozzle in press. Driving plate is connected to cam, which is connected to limit swing block and fixed plate for yarn nozzle in driving style. Outer cover plate is connected to the outer of case. The merit is that it makes loom speed and weaving efficiency increase that small driving gap, stable operation, because the rotary of limit swing block is accomplished by pinion-and-rack contacting and cam moving. |