Positioning device
First Claim
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1. A device for transforming rotary motion to substantially linear motion of a movable part in a measuring machine, the device comprising:
- an elongated transmission element having a high modulus of elasticity in a longitudinal direction and flexibility in a transverse direction;
a mechanical element to which a first end and a second end of said transmission element are fixed;
a movable part that is movable in a moving path across said mechanical element between said first and second ends of said transmission element and that is subjected to forces by at least two different portions of said transmission element to move said movable part linearly along the moving path;
a respective stationary turning point for said transmission element adjacent to each end of the moving path, said transmission element turning on one said stationary turning point between said two different portions of said transmission element;
a driver for imparting rotary motion to one said stationary turning point to move said movable part linearly; and
a tension element for imparting a tensile stress to said transmission element.
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Abstract
A measuring machine produces an essentially linear movement in a moving part by transforming rotary movement to linear movement through a transmission element having a high modulus of elasticity in a longitudinal direction, and which is flexible in a transverse direction. The transmission element has two ends which are each fastened to the same mechanical element, and the transmission element is given a pre-stress which is greater than a maximum force encountered during acceleration while the machine is in use.
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Citations
7 Claims
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1. A device for transforming rotary motion to substantially linear motion of a movable part in a measuring machine, the device comprising:
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an elongated transmission element having a high modulus of elasticity in a longitudinal direction and flexibility in a transverse direction;
a mechanical element to which a first end and a second end of said transmission element are fixed;
a movable part that is movable in a moving path across said mechanical element between said first and second ends of said transmission element and that is subjected to forces by at least two different portions of said transmission element to move said movable part linearly along the moving path;
a respective stationary turning point for said transmission element adjacent to each end of the moving path, said transmission element turning on one said stationary turning point between said two different portions of said transmission element;
a driver for imparting rotary motion to one said stationary turning point to move said movable part linearly; and
a tension element for imparting a tensile stress to said transmission element. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification