| 摘要 |
<p>A grooved cylinder (2) is mobile alternatively into two opposite guide cylinders (10, 11) which are mounted on a housing (14). Said cylinder (2) is mounted coaxially into a double crown revolution part (5) having a toothing (6a) to rotate around the axis (2a) of the cylinder (2) on rollers (B2) coupled between a third groove (16) of the respective housing cover (14a, 14b) and the respective housing (9) of the external bases of the extremities (6) of the crown (5). The cylinder (2) and the crown (5) are coupled by means of rollers (B1) arranged between a first zigzag groove (3) of the lateral surface of the cylinder (2) and first housings (8) of the inside of the crown (5), and other rollers (B1) arranged between straight grooves (4) also on the side surface of the cylinder (3) and extending between its extremities and the bends (3a) of the first groove (3), and third housings (15) provided in the respective cover (14a, 14b).</p> |
