| 摘要 |
The invention relates to an instantaneous mechanism for controlling the date indicator ( 24 ) of a timepiece movement. It comprises: a 24-hour wheel ( 10 ) pierced with a first cutout ( 12 b), a date driving wheel ( 16 ) mounted to rotate freely on the 24-hour wheel ( 10 ), coaxial therewith and having a pin ( 18 ) which fits into the cutout and a tooth ( 20 ) which collaborates with the indicator ( 24 ) to cause it to move on step by step each day at around midnight, and a spring balance ( 26, 32 ) collaborating with the pin ( 18 ). These components are shaped, sized and arranged in such a way that, at around midnight, the balance ( 26 ) escapes from the pin ( 18 ) and returns abruptly to its rest position, throwing forward the pin ( 18 ) and the driving wheel ( 16 ) whose tooth ( 20 ) strikes the date indicator ( 24 ) to cause it to move on by one step.
|
