Guide structure for stoppers

A guide structure for stoppers with or without a teat, said structure being in the form of a tunnel able to enclose and guide the cylindrical part of said stoppers, said tunnel comprising, firstly, mounting plates located transversely with respect to the running direction of said stoppers in said tunnel and distributed regularly over its length, and, secondly, thread-like rails which extend from its inlet as far as its outlet, said rails being fastened on the contour of the central passage cut through the various mounting plates and being divided into a plurality of groups:

• rails which act as a slideway for guiding the large flat surface of the cylindrical part of the stoppers,
• lateral rails which flank said cylindrical part of the stoppers,
• rails for closing said tunnel, which engage with the annular flat surface of said cylindrical body of the stoppers and which are spaced apart by a distance D corresponding at least to the diameter of the protuberance of the stoppers of the type having a teat, in order to flank this teat.