Feed-screw support structure
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United States of America Patent
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Jun 25, 1991
Grant Date -
N/A
app pub date -
Aug 28, 1989
filing date -
Aug 31, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A feed-screw support structure is adapted to absorb thermal expansion of a feed screw in a machine tool. It comprises a main-body member, a bearing-holder at the one end of the feed screw slidably arranged in the main-body member, a clamping member provided between the bearing-holder member and the main-body member and adapted to fix these members, and a device for operating the clamping member in accordance with factors and matters related to heat generation in the feed-screw. The bearing-holder member being normally held in a stationary condition by the clamping member, the feed screw being allowed to relieve thermal expansion by temporarily releasing the stationary condition when heat generation in the feed screw takes place to a relatively large degree. Alternatively, the structure may comprise a main body member, piezoelectric elements, a bearing case at the one end of the feed screw arranged between the piezoelectric elements and restricted in the axial movement by the bracket of the main-body member, and a device for measuring factors related to heat generation in the feed screw, fine adjustment of the bearing in the axial direction being effected by varying the voltage of the piezoelectric elements.
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