Cold pressure welding apparatus, coil manufacturing apparatus, coil, and method of manufacturing the same

1. A cold pressure welding apparatus comprising:

a first holding part capable of sandwiching a first flat conductor;

a second holding part disposed opposite to the first holding part and capable of sandwiching a second flat conductor;

a drive part for moving the first holding part and the second holding part;

a fixing member disposed between the first holding part and the second holding part; and

two movement restraining units each disposed adjacent the first holding part and the second holding part on a side opposite from the fixing member, wherein:

the drive part can move the first holding part and the second holding part between a first direction separated position and a close position along a first direction;

the drive part can move the first holding part and the second holding part between a second direction separated position and a sandwiching position along a second direction;

in a sandwiching state, the drive part moves the first holding part and the second holding part to the sandwiching position, so that the first holding part sandwiches the first flat conductor and the second holding part sandwiches the second flat conductor;

in a pressure welding state, the drive part moves the first holding part and the second holding part in the sandwiching state from the first direction separated position to a direction toward the close position, so that an end face of the first flat conductor and an end face of the second flat conductor are butted and pressed against each other, and thus are welded together;

in a retracted state, the drive part moves the first holding part and the second holding part to the first direction separated position and to the second direction separated position, respectively;

the movement restraining units are in contact with the first and second flat conductors so as to restrict movement of the first and second flat conductors toward outside of the cold pressure welding apparatus in the first direction prior to the sandwiching of the first and second flat conductors by the first and second holding parts; and

the fixing member is in contact with the welded first and second flat conductors so as to restrict movement of the welded first and second flat conductors in the first direction in the retracted state.

2. The cold pressure welding apparatus of claim 1 , wherein

the first holding part is provided with a groove having a depth smaller than a thickness of the first flat conductor and a width equal to a width of the first flat conductor, and

the second holding part is provided with a groove having a depth smaller than a thickness of the second flat conductor and a width equal to a width of the second flat conductor.

3. The cold pressure welding apparatus of claim 1 , wherein

sandwiching surfaces of the first holding part and sandwiching surfaces of the second holding part each at least partially include an anti-slip finished surface.

4. The cold pressure welding apparatus of claim 3 , wherein

the anti-slip finished surface is a surface with frictional resistance sufficient to suppress movement of the first and second flat conductors.

5. The cold pressure welding apparatus of claim 3 , wherein

the anti-slip finished surface is an adsorptive surface.

6. The cold pressure welding apparatus of claim 1 , comprising

a biasing member for biasing the first holding part and the second holding part in a direction in which they are separated away from each other.

7. The cold pressure welding apparatus of claim 1 , further comprising a biasing member that is placed between the first and second holding parts and applies force to push the first and second holding parts away from each other.