SPIRAL SPRING UNWINDING CORRECTION MECHANISM, AND BARREL STRUCTURE, MOVEMENT AND MECHANICAL TIMEPIECE INCLUDING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a spiral spring unwinding correction mechanism capable of unwinding a spiral spring without damaging a ring row or the like, and a barrel structure, a movement and a mechanical timepiece including the mechanism.;SOLUTION: A spiral spring unwinding correction mechanism 1 of a mechanical timepiece 4 includes: a ratchet wheel 40 which is rotated integrally with a barrel arbor 22 and provided with a plurality of ratchet teeth; and a pawl structure 50 which has first and second pawls 55 and 54, is movable between a first operating position P1 and a second operating position P2, takes one of the first and second operating positions, causes the first pawl 55 to be engaged with a ratchet tooth 41 to correct rotation of the ratchet wheel 40 in an unwinding direction of a spiral spring when taking the first operating position P1, and causes the second pawl 54 to be engaged with the ratchet tooth 41 to correct the rotation of the ratchet wheel 40 in the unwinding direction of the spiral spring when taking the second operating position P2. The rotation of the ratchet wheel in a winding direction of the spiral spring is allowed.;COPYRIGHT: (C)2013,JPO&INPIT