Patent ID: 8279717

Claim:
A calendar mechanism, comprising: a first date indicator which, being rotatable around a first central axis of rotation, includes a first date character indication portion which, being circular as a whole, indicates the ones column of the date, a circular first date indicator gear portion which, being formed on the inner periphery of the first date character indication portion, receives a torque, and a drive cam portion which, being formed on the back side of a first date character indication surface portion, defines an endless ring-shaped cam face; a drive cam lever which includes a driven lever portion whose one end portion abuts against the drive cam portion as a cam follower, and an operating lever portion which, being integral with the driven lever portion, includes a first fan-shaped gear portion at the leading end portion, wherein when the driven lever portion is pivoted in a condition in which the one end portion is in abutment with the cam face of the drive cam portion, the first fan-shaped gear portion of the operating lever portion is pivoted in accordance with the pivoting of the driven lever portion; and a second date indicator which, being rotatable around a second central axis of rotation, includes a second date character indication portion which indicates the tens column of the date, and a second fan-shaped gear portion meshing with the first fan-shaped gear portion, wherein the first fan-shaped gear portion and second fan-shaped gear portion have specified teeth which are brought into selective meshing engagement in a condition in which the first date indicator and second date indicator coincide in rotation phase.