Calender having a roll with side collars

A calender for profiling a rubber mixture for manufacturing tire casings, the calender comprising:

• three rotating rolls including an upper roll, an intermediate roll, and a lower roll, wherein (a) the three rotating rolls are arranged such that an axis of rotation of the upper roll is situated above an axis of rotation of the intermediate roll and such that the axis of rotation of the intermediate roll is situated above an axis of rotation of the lower roll, (b) the axis of rotation of the upper roll, the axis of rotation of the intermediate roll, and the axis of rotation of the lower roll are parallel, (c) the axis of rotation of the lower roll and the axis of rotation of the intermediate roll are situated in a same vertical plane, (d) the axis of rotation of the upper roll is situated in a plane inclined with respect to the vertical plane, (e) the upper roll and the intermediate roll are separated by a first distance in the inclined plane, the first distance defining a height of a first profiling nip, and (f) the intermediate roll and the lower roll are separated by a second distance in the vertical plane, the second distance defining a height of a second profiling nip;
• and
• a pair of upper lugs and a pair of intermediate lugs, wherein (a) the upper lugs are situated at transverse ends of the upper and intermediate rolls, (b) the intermediate lugs are situated at transverse ends of the intermediate and lower rolls, (c) the upper lugs include two quarter-circle bearing surfaces meeting at the first profiling nip and respectively following a shape of outer walls of the upper roll and of the intermediate roll, and (d) the intermediate lugs include two quarter-circle bearing surfaces meeting at the second profiling nip and respectively following a shape of outer walls of the intermediate roll and of the lower roll,
• wherein, for the intermediate roll or the lower roll, each transverse end of the roll is equipped with a collar fastened to the roll and positioned between the roll and a quarter-circle bearing surface of a corresponding intermediate lug of the pair of intermediate lugs, the collar enabling a radius of the roll to be increased by a height equal, within an operating clearance, to the second distance separating the intermediate roll and the lower roll.