Big date display mechanism of time piece, prohibits engagement with date advance claw of date advance wheel and japan dental association vehicle of date wheel, while setting date-advance wheel to date-advance wheel operation position

摘要

The mechanism (1) has date wheels (50,60) that are respectively provided with the day board portions for displaying date. A date wheel (60) is rotated by the tooth of japan dental association vehicle (62), when the date advance wheel (45) is engaged with japan dental association vehicle (60) in operating position. The engagement with the date advance claw (47) of date advance wheel (45) and the japan dental association vehicle (60) of the date wheel (60) is prohibited, while setting the date-advance wheel (40) to date-advance wheel operation position. An independent claim is included for the time piece.