Automatic calendar movement with interlock levers - has month-end interlock disc and year and month discs rotatable on common shaft

摘要

The automatic calendar movement includes a month-end switching mechanism and a differential planetary input gear drive. It has an interlock mechanism comprising a cam disc which in 31 days rotates 1-1/12 revolutions, a lever locking month disc which rotates one full revolution per month, and a lever locking year disc which rotates 1/12th revolution per month. These three discs are rotatably carried on a common shaft. The input shaft rotates the ring wheel of the planetary differential gear by 1/8th turn per day, and the input shaft rotates the sun wheel by 1/4 turn per day. The shaft of the interlock mechanism is driven from the planet carrier. Indication is on weekday, date and month cylinders.