PURPOSE: To improve the factor of success in a thread guard as well as to make a power source unit possible to turn into compactification, by installing an acceleration control invertor driving a godet roll for one spindle portion in addition to a common invertor driving a group of the godet rolls.
CONSTITUTION: First of all, a common invertor 6 is set at a high rate of speed by a frequency setter 7 while an accelerating invertor 8 is set at a low speed by a speed setter 10, then a yarn filament take-up starting spindle is made to pick up, for example, selector switches P1 and S1 for power source and signal use by a selection contactor 12, and either of a godet roll 1-1 and a winder 4-1 are operated at a low speed by a motor 3-1 whereby the thread guard operation of a yarn filament Y is stably carried out. Next, when setting speed of the speed setter 10 is gradually increased, a controller 9 raises the output frequency of the accelerating invertor 8 due to a deflection with the signal of a speed detector 5-1 as well as when the roll speed goes up to the specified speed, a contactor 13 is switched and turned to the side of the common invertor 6 so that operation takes place at a high speed. Since this motion is conducted at every spindle in regular sequence, a power source unit can be formed into compactification.
IWASHITA SHINZABUROU
TAKADA YOSHIO
