Flatness measuring roller

A roll for measuring the distribution of the stresses on a band running along a longitudinal direction and applied to said roll, said roll comprising

• a tubular body mounted to rotate round an axis perpendicular to the running direction and carrying a number of measuring members sensitive to a local application pressure of the band, each measuring member being mounted in a housing limited by a lateral face, closed outwardly by a wall having an external face and an internal face,
• wherein each measuring member is a feeler-type displacement sensor comprising a mobile element mounted to slide radially over a fixed element and applied outwardly to the internal face of the closing wall of the housing,
• wherein each housing of one measuring member is closed individually by a hollow part in the shape of a lid with a bottom made of an elastically deformable thin plate and integral with a peripheral part in the form of a bushing delineated by two lateral faces, respectively internal and external,
• wherein the external face exhibits a profile, in cross section, identical with that of the lateral face of the housing, so that the lid is encased without any clearance into said housing, in a position for which the external face of the bottom is situated in the extension of the external face of the roll, the opposite lateral faces of the housing and the bushing being applied one onto the other along a sufficient height so that the said bushing forms a peripheral embedding means capable of resisting the deflection moments resulting from the pressure applied to the thin plate by the band, without any risks of separation along the joint between the external face of the lid and the external face of the tubular body.