the gripper base 13 at this point since an inertia force is imparted to the weft by a fluid fed by the nozzle an excessive tension is applied to the weft upon clamping the weft by the gripper in the present invention therefore the rotary solenoid is controlled by a pwm pulse width modulation method to alleviate operation of the gripper moving part 12 and to buffer the excessive tension applied to the weft fig4 b illustrates a control pulse waveform of the rotary solenoid based on the pwm method by adopting the pwm method the rotary solenoid 16 is controlled with a narrow width discontinuous pulse waveform of voltage as compared with the control with the conventional or prior art pulse waveform as shown in fig4 a it is possible to reduce the on time of voltage alleviate initial operation of the gripper buffer an excessive tension acting on the weft and prevent breakage of the weft fig4 c illustrates an embodiment of the linear control method which comprises applying linear control to voltage and controlling the rotary solenoid with the use of a buttress waveform pulse the control pulse of the rotary solenoid 16 is provided by means of a buttress waveform pulse and voltage which is low in the initial stage of operation gradually increases this type of control therefore alleviates initial operation of the rotary solenoid and alleviates initial operation of the pinch roller and the gripper the weft feeding device of the present invention is an apparatus for feeding a weft by means of a nozzle by clamping the weft with a length measuring roller and the pinch.