| 摘要 |
1478170 Workpiece transferring REGIE NATIONALE DES USINES RENAULT 27 Dec 1974 [28 Dec 1973] 55936/74 Heading B3B [Also in Division F2] A workpiece transferring device in which a transfer bar 6 is moved rectilinearly, comprises a lever 1 driven in rotation about a fixed first axis 2, an arm 4 rotatably mounted on the lever about a second axis 3 parallel to axis 2, the arm 4 being further connected to the transfer bar 6 by a pin 5 at a third axis parallel to the first and second axes 2, 3 with the length of the lever being the same as the length of the arm between the respective axes 2, 3 and 3, 5, and wherein a mechanism 7, 8, 9 between the lever 1 and arm 4 acts to drive the arm at a relative angular velocity double that of, and in the opposite direction to that of, the lever, the mechanism being characterized by the provision of a drive mechanism 30-44 for rotating the lever about the first axis 2 comprising a drive element with a cycloidal trajectory to modulate the speed. of rotation of the lever and thus that of the displacement of the transfer bar. The mechanism between the lever and arm may comprise a fixed gear 7 and a gear 8 fixed to the arm and half the size of gear 7 acting through an intermediate gear 9. Alternatively a toothed belt may connect the gears 7, 8. The lever drive mechanism comprises a driven worm 44 meshing with a wheel 43 which carries eccentrically a pinion 35 which meshes with a fixed gear 42. The pinion shaft carries fixedly a crank 33 engageable by a roller 32 in a slot 31 of a drive wheel 30 connected to rotate the lever 1. An alternative mechanism is described with reference to Fig. 10 (not shown) in which a fixed gear (102) is engaged both by the drive pinion (106) and the intermediate gear for the arm mechanism. The drive to the worm 44 includes a flywheel, an electromagnetic coupling (47) and an electromagnetic brake (51), (52) (Fig. 4, not shown). |
