Timepiece mechanism

Timepiece mechanism (1) comprising:

• a first source of energy (2),
• a regulating member (4) arranged to regulate the first source of energy (2),
• a second source of energy (5) independent of the first source of energy (2),
• a control member (6a) arranged to be driven by the second source of energy (5),
• a blocking device (8) arranged to be controlled by the first source of energy (2) to block the second source of energy (5) and to release it at determined times in order to allow the control member (6a) to be displaced by jumps under the action of the second source of energy (5),
• wherein the blocking device (8) comprises:
• first and second mobile parts (8a′, 8a″;
• 8s, 8t) kinematically connected to one another, the first mobile part (8a′;
• 8s) comprising a drive device (8h;
• 8d′), the second mobile part (8a″;
• 8t) comprising a stopping device (8i),
• a rotating drive member (8f) kinematically connected to the first source of energy (2) and arranged to co-operate with the drive device (8h;
• 8d′) to displace the first mobile part (8a′;
• 8s), and thus the second mobile part (8a″;
• 8t), alternately in opposite directions, and
• a rotating blocking member (8g) kinematically connected to the second source of energy (5) and arranged to co-operate with the stopping device (8i) to be blocked by the second mobile part (8a″;
• 8t) and released at said determined times by said displacements of the second mobile part (8a″;
• 8t).