Method for pressure bonding of a breaker-tread assembly with a carcass assembly by means of stitching in the manufacture of green tyres and device for accomplishment of such method

Described is a method of joining a belt-tread assembly with a carcass assembly by stitching in green tyre production such that a pressure is applied in radial inward direction on the rotating outer peripheral surface of a belt-tread assembly ( 5 ) partially joined with an inflated carcass assembly ( 1 ) of a tyre, which is disposed on a tyre building drum, the pressure being exerted by inelastic force of at least two stitching rollers ( 2 ) which are rotationally and inelastically disposed on a rigid bearing part ( 3 ) of the stitching unit. The rigid bearing part ( 3 ) is provided with means for mutual symmetrical axial movement in the direction of arrow ( 6 ) of the stitching rollers ( 2 ) from the central part of the outer peripheral surface of the belt-tread assembly ( 5 ) of the tyre being produced to its shoulders, with means for moving the rigid bearing part ( 3 ) along an axis perpendicular to the rotation axis of the tyre being produced, and with means controlling rotational position of the stitching rollers ( 2 ) in the direction of arrow ( 7 ), the compressive force of the rollers ( 2 ) being controlled by the means for moving the rigid bearing part ( 3 ) in the direction of an axis perpendicular to the rotation axis of the tyre being produced. Also a device for accomplishing the method is described.