Method and apparatus for accurate positioning of printing units
AssigneeObjet Ltd.
InventorsEliahu M. Kritchman, Alexander Libinson
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Abstract
Embodiments of the invention are directed to systems and methods for accurate positioning of a unit movable by a drive system. The method may include adjusting tension of a resilient element of the drive system to reduce hysteresis motion errors of the resilient element below a predetermined threshold by performing measurements of the hysteresis motion errors of the resilient element for two or more tension values and selecting a tension value for which the hysteresis motion error is below the threshold.
Claims13
A method for accurate positioning of a unit movable by a drive system, the method comprising:
- adjusting tension of a resilient element of the drive system such that hysteresis motion errors of the resilient element remain below a predetermined threshold, wherein adjusting comprises:
- measuring, for two or more tension values, the hysteresis motion errors of the resilient element;
- and
- selecting a tension value for which a hysteresis motion error is below the threshold.
A method for reducing hysteresis errors in a drive system having a resilient element, the method comprising:
- receiving a request to move a unit connected to the drive system a desired distance, smaller than a first threshold and larger than a second threshold, from a first position to a second position in a desired direction opposite to a direction of a previous movement command;
- and
- generating a first and second consecutive commands, the first command is to move the unit in a first direction and the second command is to move the unit in a second direction opposite to the first direction and the first and second commands are to move the unit a distance larger than the first threshold, such that the sum of the first and second commands is equal to a single command to move the unit the desired distance in the desired direction.
Dependencies are inferred from the claim text.