Abstract: In order to control cotton fibre fluctuation between the compactor device (5) and the drafting unit (6) within a card (1A), the drafting unit (6) can be moved (either along a rectilinear trajectory and/or along a circular trajectory) between a first position (L) coinciding with its maximum distance from the compactor device (5) and a second position coinciding with its minimum distance from said compactor device (5) until said distance is reduced to the minimum possible. The distance between the drafting unit (6) and the compactor device (5) varies in a manner inversely proportional to the operating speed of the card (1A). In an alternative embodiment:a support and guide element (40) for the web (9) is positioned between the doffer (2) and the pair of rollers (7, 8) of the compactor device (5);a conveyor device (24) is interposed between the compactor device (5) and the drafting unit (6) (FIG. 2).

Abstract: A carding flat and a system for guiding and driving it in a card with moving flats driven by articulated chains, in which coupling between the flats and chains is achieved by a form fit using recesses and projections without fixed retention devices, so that these elements are not mutually constrained in the direction perpendicular to the chain movement.

Abstract: A carding flat and a system for guiding and driving it in a card with moving flats driven by toothed belts, in which coupling between the flats and belts is achieved by a form fit between cavities and projections without fixed retention means, so enabling these elements to freely rotate about the coupling axis.

Abstract: A device for monitoring and regulating the tension in the sliver produced by a carding unit and transferred from this along a path to a unit for its collection into cans for further processing, comprising a deviator bar pivoted on a pivot and an oppositely located rod provided with an element which opposes the rotary movement of the bar deriving from the variations in tension of the sliver deviated by it, the sliver tension being measured by sensors on the basis of the effect induced by the sliver on the bar, the relative signals being transmitted to the control unit which compares the values received with the allowable limiting values and implements the consequent interventions.

Abstract: A sliding flat formed from section bars for a card with moving flats driven by toothed drive belts, with upper return guides for the flats. The flats are provided in their ends with pins for cylindrical coupling with the toothed belts, said coupling pins projecting from the toothed belt such that it is they which rest on the return guides instead of the teeth of the toothed belt.