A preparation device for preparing a sample of textile fibers, applicable to analysis and/or measuring apparatuses respectively for analyzing and/or measuring characteristics of the textile fibers forming said sample, wherein the preparation device comprises:
- a comb body that can be coupled in a sliding manner along a rectilinear guide that faces a perforated plate against which to press a mass of textile fibers forming protuberances projecting from holes of said perforated plate, wherein said comb body is arranged to grip tufts of textile fibers from said protuberances;
- and
- at least one brush that is mounted in a sliding manner along the rectilinear guide facing said perforated plate and that is arranged to brush the textile fibers forming said protuberances before said comb body grips said tufts.