Date mechanism for timepiece

摘要

The mechanism has a units pinion/indicator (3) with ten or multiple of ten teeth and a tens pinion/indicator (4) with four or a multiple of four teeth. A peg (9) on the units pinion drives the tens pinion through a return pinion (10). An auxiliary pinion (12) engages alternately with the tens pinion and a tens cam (15) to drive the tens pinion one step between 31 and 01 without driving the units pinion