Patent ID: 7402221

Claim:
A device for joining a belt-tread assembly with a carcass assembly by stitching in tyre production, characterized in that it comprises: a rigid bearing part ( 3 ) at least two rotationally attached stitching rollers ( 2 ), each of them being independently, inelastically and axially movably attached to the rigid bearing part ( 3 ), which is provided with means for axial mutually symmetrical movement of the stitching rollers ( 2 ), wherein the means are formed by at least one slide ( 62 ), arranged in parallel with a rod ( 63 ), which is provided symmetrically from its centre with threadings of opposite pitch sense and is joined with one end of supports ( 8 ), which is adapted for symmetrical movement of supports ( 8 ) along the rod ( 63 ), controlled by a servomotor ( 61 ) for axial mutually symmetrical movement of the stitching rollers ( 2 ), which are rotationally attached at other ends of supports ( 8 ), wherein the stitching rollers ( 2 ) have an axis parallel to a rotation axis A of the tyre being produced, and inelastic means for moving the rigid bearing part ( 3 ) in a direction perpendicular to the rotation axis A of a tyre being produced for bringing the rigid bearing part ( 3 ) to a predetermined position and to control compressive force of the rollers on the green tyre being produced, the means being formed by at least one slide ( 42 ) parallel to a threaded rod ( 43 ), which is connected with a servomotor ( 41 ), wherein the threaded rod ( 43 ) together with the at least one slide ( 42 ) is arranged perpendicularly to the rod ( 63 ) provided symmetrically from its centre by threadings of opposing pitch with the proviso that the compressive force of the rollers is not induced by pneumatic cylinders.