Method And Machine For Rubberizing An Annular Surface Of A Body

A machine for rubberizing an annular surface of a body, the machine comprising a spindle presenting an axis and adapted to support the body with the annular surface to be rubberized coaxial to the axis;

• first drive means to bring the spindle into rotation about the axis;
• and a feeding unit adapted to feed onto the annular surface a strip of elastomeric material presenting a section of determinated shape;
• the feeding unit comprising an extruder for the production of elastomeric material in the form of a band, a calender for transforming the band of elastomeric material produced by the extruder into the strip of determined section, an applicator roller arranged downstream from the calender, having, in use, a peripheral speed and arranged, in use, tangential to the annular surface to be rubberized at an application point of the strip to the annular surface itself and mobile relative to the spindle to bring the application point to brushing, with a determined application speed equal to the speed of the application point about the axis, the whole annular surface in conjunction with a rotation of the spindle about the axis itself;
• the machine being wherein the applicator roller is slaved to the spindle so as to maintain equal to a determined constant value the speed differential existing between the application speed and the peripheral speed to apply to the strip a first constant drawing during the passage between the applicator roller and the annular surface;
• and in that the feeding unit is shaped so as to apply to the strip a further drawing upstream of the first drawing.