The step-down gear consists of a small worm wheel (8) and a large toothed wheel (9) with radial teeth.
A number wheel counter has a worm wheel (12) connected with the least significant number wheel.
A worm gear (14) engaged with the worm wheel is mounted for both rotational and translational movement about a spindle (16).
Each winding roller (3) is intergral with a worm wheel (4) rotatably mounted in a housing (13).
According to the invention, this is avoided by integrating the coupling (24) in the worm wheel (22), said coupling forming the interface between said worm wheel and the steering column (16).
Such a mechanism may find itself useful in a great number of applications where a worm gear/tangent wheel reducer was heretofore used, particularly applications where a very high precision and a high efficiency are required.
The thread (2) act on the teeth, inclined or not, of the tangent wheel (4), either by their own inclination, or by the offset of the thread (2) passing from one roller to the next.