| 摘要 |
The present invention describes a rotary motion transmission system between two axes, in particular between two parallel axes and more in particular a transmission system without coupling backlash. It refers also to the head of a machine tool using said transmission system. In one embodiment the invention is made up of a rotary motion transmission system (10) by means of gear wheel between a first driving shaft (11) and a second driven shaft (12) characterised in that it comprises a first (16) and a second (17) oblique gear concentric to said driving shaft (11), a third (14) and a fourth (15) oblique gear concentric to said driven shaft (12), said first (16), second (17) and third (14) gear are integral with the respective shafts (11, 12), said first (16) and second (17) gear engage respectively said third (14) and fourth (15) gear, said fourth gear (15) is constrained for the rotation to said third gear (14) and is mounted on said driven shaft (12) so that it can slide axially along it against the action of an elastic force, so that the teeth of said fourth gear (15) are forced against the teeth of said second gear (17) to annul the backlash between said fourth (15) and said second (17) gear and consequently between said first (16) and third (14) gear. <IMAGE> |
