Spring for a notching system and timepiece notching system

A spring for a notching system, the spring comprising:

• at least two elastic arms, and
• a first toothset comprising first notching teeth disposed on each of the arms,
• the spring being designed so that, in a position in which a first one of the arms of the spring is not loaded, the first arm is convex as seen from the top of the first notching tooth of the first arm,
• wherein each of the elastic arms comprises a first abutment force reacting element, and wherein the first abutment force reacting element is disposed at a midway point of each of the elastic arms.

A spring for a notching system, the spring comprising:

• at least two elastic arms, and
• a first toothset comprising first notching teeth disposed on each of the arms,
• the spring being designed so that, in a position in which a first one of the arms of the spring is not loaded, the first arm is convex as seen from the top of the first notching tooth of the first arm,
• wherein each of the elastic arms, when it is not loaded, is in the form of a circular arc, the center of which is situated on a first circle coaxial with the spring and having a non-zero radius,
• wherein the first circle has a radius greater than 1.5 times a radius of the spring.

A notching system comprising:

• a spring, and
• a first member having a second toothset,
• the spring and the first member being arranged so as to act on one another,
• wherein the spring comprises:
• at least two elastic arms, and
• a first toothset comprising first notching teeth disposed on each of the arms,
• the spring being designed so that, in a position in which a first one of the arms of the spring is not loaded, the first arm is convex as seen from the top of the first notching tooth of the first arm, and
• wherein the first toothset comprises n first teeth and the second toothset comprises m second teeth, wherein:
• n=8 and m=6, or
• n=6 and m=5, or
• n=10 and m=12, or
• n=12 and m=15, or
• n=12 and m=20, or
• n=8 and m=15.