Gravity compensation device for a chip transfer apparatus
AssigneeNXP B.V.
InventorJoep Stokkermans
Life of this patent
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Abstract
A gravity compensation device partially or completely compensates a force exerted by a basic mass (10) on a balancing device (12) at a first distance from an axis of rotation (13) by using a force generating device, such as spring (14), exerting a counterforce on the balancing device at a second distance from the axis of rotation. The first distance, the second distance, or both are selectable for providing the desired gravity compensation. One or more pulleys with an angle-variable radius may be used. The gravity compensation device does not add substantial mass to the basic mass, and is simple in design.
Claims18
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.
Dependencies are inferred from the claim text.