The invention concerns a sound generator mechanism including a control member (10) and a mechanism (14) for locking/unlocking the control member (10), the control member (10) being able to move between a first position in which the control member is held by the locking/unlocking member (14) and in which it holds the vibrating member (12) away from the rest position thereof, and a second position wherein the control member is released by the locking/unlocking mechanism (14) and wherein it simultaneously releases the vibrating member (12), which starts to vibrate and to produce a sound.