| 摘要 |
<p>A mechanism (100) for advancing, by periodic jumps, a pivoting cage (10) having a wheel (11) and an escapement pinion (12), and a pallet fork (13) engaging with said wheel (11) and a spiral balance, and comprising, in a manner supported by said cage (10): retaining means (20) which, by moving or not moving, enable or prevent the pivoting movement of said cage (10); arresting means (30) which, depending on their angular position, enable or prevent the pivoting movement of said retaining means (20). A constant-force device (40) periodically engages said retaining means (20); it has a tail (21) which is designed to perform complete revolutions.</p> |
