Patent ID: 7254094
Filing Date: 2007-08-07
Classification: G04B,G04C

Abstract:
1. A timepiece with a calendar mechanism containing 2 date indicators, possessing: a 1st date indicator displaying a place of units among dates, a 1st date jumper for setting a position of the 1st date indicator in a rotation direction, a 2nd date indicator displaying a place of tens among dates, a 2nd date jumper for setting a position of the 2nd date indicator in a rotation direction, and a date intermediate wheel which rotates on the basis of a rotation of the 1st date indicator, thereby being capable of rotating the 2nd date indicator, characterized in that a rotation center of the 1st date indicator and a rotation center of the 2nd date indicator are disposed so as to exist in the same position, the 1st date indicator contains 31 1st date indicator teeth parts formed as internal teeth and 4 calendar shift teeth formed as internal teeth, the 1st date indicator teeth parts are formed with a spacing of equal angle, and the calendar shift teeth comprise a 1st calendar shift tooth becoming a reference, a 2nd calendar shift tooth formed with a spacing of (360×2/31) degrees in a 1st direction with the 1st calendar shift tooth being made the reference, a third calendar shift tooth formed with a spacing of (360×10/31) degrees in the 1st direction with the 2nd calendar shift tooth being made a reference, and a 4th calendar shift tooth formed with a spacing of (360×9/31) degrees in a direction opposite to the 1st direction with the 1st calendar shift tooth being made the reference, each of the calendar shift teeth possesses a positive rotation unlocking part for unlocking the 1st date indicator in the 1st direction and a reverse rotation unlocking part for unlocking it in a 2nd direction opposite to the 1st direction, and when the rotation center of the 2nd date indicator is defined as “CDA”, a rotation center of the date intermediate wheel is defined as “CMD” and a straight line passing through the “CDA” and the “CMD” is defined as “LDM”, as to each of the calendar shift teeth, a disposition of the calendar shift tooth under a state before the 1st date indicator is unlocked in the 1st direction and a disposition of the calendar shift tooth under a state that the 1st date indicator has been finished to be rotated in the 1st direction are constituted in an axisymmetric relation whose reference line is made the “LDM”.