MECHANICAL TIMEPIECE WITH TIMED ANNULAR BALANCE ROTATING ANGLE CONTROL MECHANISM

摘要

In a mechanical time piece according to the invention, a movement 300 includes a barrel complete 120, a center wheel & pinion 124, a third wheel & pinion 126, a fourth wheel & pinion 128, a balance with hairspring 140, an escape wheel & pinion 130 and a pallet fork 142. The mechanical time piece of the invention is provided with a balance rotational angle control mechanism constituted to generate static electricity when a rotational angle of the balance with hairspring 140 becomes equal to or larger than a predetermined threshold and not to generate the static electricity when the rotational angle of the balance with hairspring 140 does not exceed the predetermined threshold. The balance rotational angle control mechanism includes a balance insulating plate 324 provided to the balance with hairspring 140, a main plate insulating plate 322 arranged to a main plate 102, a switch lever 168 rotatably provided to a balance bridge 166, a hairspring switch member 312 attached rotatably to the switch lever 168 and provided to operate by being brought into contact with a hairspring and degree contact members 340, 342 for determining a position of the hairspring switch member 312.;By rotating the hairspring switch member 312, generation of the static electricity between the balance insulating plate 324 and the main plate insulating plate 322 can be controlled.