Friction system for a horological movement

A friction system for a horological movement, which friction system comprises:

• a staff configured to be mounted in the horological movement;
• a first stationary element mounted on the staff;
• a second stationary element mounted on the staff;
• a toothed member mounted to rotate freely on the staff between the first stationary element and the second stationary element;
• a third stationary element mounted on the staff;
• a spring mounted on the staff and arranged between the second stationary element and the third stationary element;
• the spring taking the form of a flat washer comprising an inner part close to the staff bearing against the third stationary element, and an outer, peripheral part of the washer bearing resiliently against an annular element of the second stationary element, the spring being arranged to be stressed in order to resiliently deform between the second stationary element and the third stationary element, and to form a kinematic link both between the first stationary element and the toothed member, and between the second stationary element and the toothed member up to a predefined friction torque.