PURPOSE: To readily specify a consumed contact point and to suppress consumption of contact point in changing a driving pattern of a frame motor by ON-OFF of contact point of plural electromagnetic switches by providing a specific electromagnetic switch with practically changing function.

CONSTITUTION: Change of driving pattern of a frame motor 1 to cause vertical movement of a heald 5, longitudinal movement of a reed 6, rotation of a surface roller 8, etc., in a weaving machine is carried out by opening and closing of plural electromagnetic switches MC1 6 by changing connection constitution of primary windings CL1, CL2 and CL3 to Y connection or Δ, etc. Among the above-mentioned constitution, ON-OFF timings of specific electromagnetic switches MC5 and MC6 are slightly staggered from timing of other electromagnetic switches MC1-4 and are made coincident with switching timing of power supply and stop from a main electric source VM or an inverter electric source VI to the frame motor 1 so that consumption of contact point by ON-OFF is concentrated on the electromagnetic switches MC5 and MC6.