| 摘要 |
The bead breaking unit (1) for tyre changing machines comprises an arm (2) having a first extremity (2a) associated turnable with a support structure (3) and a second extremity (2b) having a bead breaking tool (4), the arm (2) being suitable for oscillating between an away position, wherein the bead breaking tool (4) is positioned substantially at a distance from the support structure (3), and a work position, wherein the bead breaking tool (4) is positioned substantially close to the support structure (3), actuator means (6) having a mobile element (7) associated sliding with the arm (2), drive means (10) for driving the arm (2), associated with the mobile element (7) and suitable for operating during the movement of the mobile element (7) from an extracted position to a retracted position to move the arm (2) towards the work position and means of temporary coupling (10, 11, 12, 13, 14) between the mobile element (7) and the arm (2), suitable for operating during the movement of the mobile element (7) from the retracted position to the extracted position to move the arm (2) from the work position to the away position. |
