Patent ID: 8861313
Filing Date: 2014-10-14
Classification: G04B

Abstract:
1. A calendar mechanism comprising: a date indicator that includes a date wheel portion provided with a notched portion extending in a diameter direction; an operation lever that is attached to the date indicator so as to be pivoted with respect to a date wheel and is provided at one end with a tooth-shaped engaged portion and can progress and retreat to and from the notched portion formed at the date indicator when pivoted, wherein the operation lever can be pivoted between a pre-feed allowing position where the tooth-shaped engaged portion is deeply inserted into the notched portion and is engaged with a date finger, and thereby excess feeding of the date indicator is possible, and a normal feed allowing position where the tooth-shaped engaged portion retreats further from the notched portion than the pre-feed allowing position and thus normal feeding is possible by the date finger, and the date finger is engaged with the tooth-shaped engaged portion before the timing of the normal feeding and rotates the date indicator by an excess day earlier than the normal feeding when set to the pre-feed allowing position; a month cam that is rotated according to rotation of a month indication wheel and has a cam face indicating long months and short months; and a driving lever structure that includes a cam follower engaged with the month cam and is driven in response to rotation of the month cam so as to allow the operation lever to be pivoted between the normal feed allowing position and the pre-feed allowing position, wherein the driving lever structure allows the operation lever to be displaced to the pre-feed allowing position when a month is changed from the short month to the long month.