Winding device, in particular for a horological barrel, provided with a disconnectable winding gear train

A winding device for a barrel provided with a spring, comprising:

• a ratchet fixedly mounted on a rotary winding shaft, the rotary winding shaft being a winding shaft of the barrel, a rotation of which winds the barrel, and a winding gear train meshing with the ratchet, a rotation of the winding gear train causing the ratchet to rotate and the winding shaft to rotate by applying a torque to the ratchet, the winding gear train being movable between a coupled position wherein said winding gear train drives the ratchet and a disconnected position wherein said winding gear train does not drive the ratchet,
• wherein the winding gear is mounted on the spring exerting a return force on the winding gear train to hold said winding gear train in the coupled position,
• wherein the winding gear train meshes with a winding actuating wheel when said winding gear train is in the coupled position, and does not mesh with the winding actuating wheel when said winding gear train is in the disconnected position, and
• wherein the spring comprises a flexible guide forming a virtual pivot, the winding wheel being suspended by the flexible guide, the flexible guide exerting a radial return force on the winding wheel in a direction of the actuating wheel.