Calendar switching mechanism with automatic year cycle - has month display sprocket wheel and month class rotation switch body mounted on hollow shaft

摘要

The rotating element (55) of the mouth-class rotation switch is arranged on a hollow shaft of the calendar switching mechanism. This hollow shaft is rotatably mounted with its bore on a mouth rotation shaft. Also arranged on the hollow shaft is the sprocket wheel (62) of the mouth indicator drive. The hollow shaft may be advanced by a single-tooth gear wheel (51) which advances as 12-tooth gear wheel (53) by one step (1/12 revolution) for each rotation. The hollow shaft is advanced to change the mouth during the last day of the month.