Method for forming a date mechanism operated by a clockwork

摘要

The basic mechanism used consists of a driving tooth (8), units pinion/indicator (3), tens pinion/indicator (4), return pinion (10) and auxiliary pinion (12). To this is added an annual pinion (18) which selectively engages with the driving tooth only when passing from 30 to01 and with the tens pinion only when the latter is passing from 2 to 3 and from 3 to 0.