| 摘要 |
<p>A device for grasping and subsequently displacing an object to a delivery position, comprising a gripper (3) suspended from a trolley (2) and provided with at least three prongs (10) which are each pivotable relative to a carrier (4) 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 (5) connected to the carrier (4) and a magnetic core (7) which is movable in the coil (5) and coupled to the prongs (10) and which consists of a system of permanent magnets (14, 15), which coil can be energized by a current, wherein the magnets (14, 15) 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.</p> |
