| 摘要 |
PURPOSE:To prevent a yarn from breaking by multiplying a function unit for generating the rotating speeds of a motors for individually driving the units of a fly frame by a cushion signal output from a DC smoothing capacitor to decelerate the motors at a predetermined ratio. CONSTITUTION:An AC power source AC voltage is rectified by a rectifier 1, smoothed by a smoothing capacitor C1, inverters 2-4 are driven to generate AC of frequencies necessary for a spindle motor 5, a bobbin motor 6 and a lifter motor 7, thereby driving motors 5-7. A setter 8 sets a reference rotating speed of the motors 5-7, multiplied by the output of a cushion circuit 15 through function units 9-11 by multipliers 12-14, and the inverters 2-4 are controlled. The circuit 15 does not output a signal at the time of normal operation, but a logic circuit 17 outputs by the output of a capacitor C2 when a power interruption is detected, multiplied by a coefficient via the circuit 15 by multipliers 12-14, thereby decelerating the speeds of the motors 5-7 at a predetermined ratio. Thus, a constant tension of a yarn is maintained to prevent it from breaking. |
