Flexible escapement mechanism having a balance with no roller

A timepiece escapement mechanism comprising:

• a fixed structure;
• a balance and an escape wheel;
• a flexible, single-piece mechanism configured to transmit impulses between the balance and the escape wheel, the single-piece mechanism including at least one flexible strip which connects the flexible, single-piece mechanism, to the fixed structure or the escape wheel;
• a balance spring configured to maintain oscillation and which ends in a balance spring stud arranged to move during operation, and the balance spring stud is guided by a flexible guide member including flexible strips, the balance spring stud receiving a pin configured to cooperate with a cam path of the escape wheel, and
• wherein the balance spring stud is subjected to a force exerted by the balance spring, the force tending, during the oscillation, to move the balance spring stud relative to a locking position thereof, and imparting a motion to the pin to maintain and regulate the oscillation without use of a balance roller.