Patent ID: 7677523

Claim:
A chip transfer apparatus comprising a gravity compensation device for compensating at least part of the force of gravity acting on a basic mass, the device comprising: a balancing system, comprising: an axis of rotation a balancing device being rotatable around the axis of rotation and being configured to be connected to the basic mass at a first predetermined distance from the axis of rotation for generating a first moment relative to the axis of rotation in a first rotational direction; a force generating device having a first terminal configured to be connected to the balancing device at a second predetermined distance from the axis of rotation for generating a second moment relative to the axis of rotation in a second rotational direction opposite to the first direction, the force generating device having a second terminal configured to be connected to a reference position wherein for different angular positions of the balancing device, the first predetermined distance and the second predetermined distance are selected such that the first moment and the second moment have a predetermined relationship.