Timepiece striking mechanism, including a fixed structure supporting at least one gong or radiant element and a mobile hammer in a plane under the action of an activation mobile component controlling the pallet of the hammer (3) and the release thereof for the percussion of the gong, and including, for the suspension of the hammer, at least one planar flexible guide between the structure and the hammer (3) to allow movements of the hammer solely on the plane, forming the sole mechanical link between the structure and the hammer, and, more particularly, for the execution of a striking mechanism, the striking mechanism (drives the activation mobile component, and has same carry out a winding cycle during which it supplies constant quantity of energy to the flexible guide while driving the hammer before releasing same for the execution of the striking mechanism by percussion of the gong during letting down.