Conveyors: power-driven – Conveyor section – Screw
Patent
1989-08-28
1991-06-25
Valenza, Joseph E.
Conveyors: power-driven
Conveyor section
Screw
384905, 384278, B65G 3326
Patent
active
050259148
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.
REFERENCES:
patent: 2915721 (1959-12-01), Farrand et al.
patent: 3106432 (1963-10-01), Opferkuch
patent: 3582924 (1969-05-01), Uemura et al.
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patent: 3626397 (1969-09-01), Uemura et al.
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patent: 3781072 (1973-12-01), Nattefort
patent: 4226485 (1980-10-01), Pruvot
Higgelke, Ziegler, Moderne fertigung, Sep. 1986, pp. 70-71, "Wachstunsbreunse fur Werkzeug Machinen".
Neues aus der Tecknik, Nr. 1, 1/1/67, p. 4.
Bidwell James R.
Okuma Machinery Works Ltd.
Valenza Joseph E.
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