Patent ID: 7594621

Claim:
A method of manufacturing a level wound coil (LWC) comprising the steps of: providing a plurality of coil layers each of which comprises a pipe wound in alignment winding and in traverse winding; locating a coil of a (m+1)-th coil layer such that a pipe at a start position thereof is fitted into a concave part formed outside of the m-th coil layer and between a pipe at a lower end and its adjacent pipe of a m-th coil layer, where, when the LWC is disposed on a mount surface perpendicular to a coil center axis of the LWC, m is an odd natural number if a start position of the winding of the LWC is located at an upper end and m is an even natural number if the start position is located at a lower end; locating a shift section where the pipe is shifted from the m-th coil layer to the (m+1)-th coil layer on a bottom surface thereof when the LWC is disposed on the mount surface perpendicular to the coil center axis; locating a part or a total of a start point of the (k+1)-th shift section on an outer layer side not to transit, relative to a start point of the k-th shift section on an inner layer side, to a direction reverse to a winding direction of the pipe, and controlling a length of the shift section that does not transit to the reverse direction when the pipe is shifted until the pipe at the start position of the (m+1)-th coil layer is fitted into the concave part formed outside of the m-th coil layer.