Gear mechanism of timepiece, hand winding mechanism and timepiece having the same

A hand winding mechanism comprising:

• a first gear structure member having a first gear rotated around a first rotation center axis line in accordance with rotation of a winding stem in one direction;
• a pivoting support member having a long hole extended in a shape of a circular arc centering on the first rotation center axis line;
• a pivoting member in a circular shape an outer periphery of a cross-sectional face of which centers on a second rotation center axis line and which is loosely fitted to the long hole rotatably centering on the second center axis line and movably along the circular arc of the long hole;
• a pivoting crown wheel which is a second gear structure member including a pivoting crown gear fitted to the pivoting member to be able to rotate slidably and constituting a second gear portion brought in mesh with the first gear portion;
• and
• a third gear structure member including a third gear portion brought in mesh with the pivoting crown gear when the pivoting member is disposed at a mesh position disposed on one end side of the long hole and released from being brought mesh with the pivoting crown gear when the pivoting member is disposed at a nonmesh position disposed on other end side of the long hole and coupled to a ratchet wheel.