| 摘要 |
A device for grasping and subsequently displacing an object to a delivery position, comprising a gripper suspended from a trolley and provided with at least three prongs which are each pivotable relative to a carrier and which are displaceable by control means from a spread position to a closing position and vice versa, wherein the control means are formed by a coil connected to the carrier and a magnetic core which is movable in the coil and coupled to the prongs and which consists of a system of permanent magnets, which coil can be energized by a current, wherein the magnets are disposed such that their combined flux will form a constant pattern relative to the coil in all positions, whereby the gripping force is constant in the diverse closing positions. |
