| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high quality chronograph wheel capable of corresponding to automatic assembly work and obtained by combining a heart cam and a heart cam balancer in accurately determined phase relation. <P>SOLUTION: A chronograph wheel 1 includes: an axle 2 in which a chronograph hand is attached to one end part 2a side; a chronograph gear 3 fixed on the other end part 2b side of the axel 2; a heart cam 4 fixed on the axle at a position closer to the other end part than the gear 3; and a heart cam balancer 5 fixed on the axle between the chronograph gear and the heart cam. In the heart cam balancer, an insertion hole 5a for inserting a regulation pin pierced through a through-hole 20b of the chronograph gear and used in assembly is formed. The heart cam balancer is fixed on the axle in such a state that rotation to a peripheral direction is regulated by the regulation pin in assembly, and the heart cam is fixed on the axle in such a state that a predetermined relative angle in the peripheral direction is maintained with respect to the heart cam balancer of which the rotation is regulated in assembly. <P>COPYRIGHT: (C)2012,JPO&INPIT |
