Patent ID: 7293350
Filing Date: 2007-11-13
Classification: H02K,Y10T

Abstract:
1. A coil forming apparatus for manufacturing coils of a stator of a rotary electric machine having a predetermined number of stator slots comprising: a twisting formation unit for twist-forming a predetermined number of U-shaped conductor segments each of which has a pair of parallelly extending straight portions and a turn portion connecting the straight portion, said twisting formation unit including a first twisting formation jig composed of a first inside ring and a first outside ring and a second twisting formation jig composed of a second inside ring and a second outside ring; wherein: each of said first and second inside rings has the same predetermined number of circumferentially disposed holding slots as the stator slots to hold one of each pair of straight portions; each of said first and second outside rings has the same number of circumferentially disposed hairline slots as the stator slots to hold the other of each pair of straight portions; said first and second inside rings and said first and second outside rings are coaxially coupled to shift relative circumferential position between said inside rings and said outside rings by a predetermined angle to twist the turn portions; said twisting formation unit includes knocking bars for discharging the conductor segments from first and second twisting formation jigs; and said first and second twisting formation jigs are movable relative to said knocking bars when discharging the conductor segments from said first and second twisting formation jigs.