1) Preparation device (10) for preparing a sample of textile fibers, in particular cotton 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 (10) comprises:
- a comb body (11) that can be coupled in a sliding manner along a rectilinear guide (12) that faces a perforated plate (13) against which to press a mass (M) of textile fibers forming protuberances projecting from the holes of said perforated plate (13), wherein said comb body (11) is arranged to grip tufts of textile fibers from said protuberances,
- and is characterized in that it comprises at least one brush (14) that is mounted in a sliding manner along a rectilinear guide facing said perforated plate (13) and that is arranged to brush the textile fibers forming said protuberances before said comb body grips said tufts.