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An actuator designed in such a way that a feed screw having both ends respectively supported in a rotatable manner by a pair of bearing members arranged on a base is moved in the proper direction by a rotary driver, and as a feed nut engaged with the feed screw with its rotation being restricted by

An actuator designed in such a way that a feed screw having both ends respectively supported in a rotatable manner by a pair of bearing members arranged on a base is moved in the proper direction by a rotary driver, and as a feed nut engaged with the feed screw with its rotation being restricted by the feed screw is moved in accordance with the rotation of the feed screw, a slider attached to the feed nut is moved. A pair of support members are provided midway between the slider and the bearing members located on both sides of the slider and are movable in a feeding direction. The support members support the feed screw while their postures are restricted in a direction perpendicular to the feeding direction. The support members are coupled by first coupling means. Rotary bodies are respectively attached to the support members in a rotatable manner, with a thread member put around those rotary bodies. The thread member has both ends coupled to the slider and has its center portion secured to the base. The actuator is further provided with second coupling means for setting the moving speed of the support members to a half of that of the slider.

대표청구항 ▼

[ What is claimed is:] [1.] An actuator comprising:a feed screw having both ends respectively supported in a rotatable manner by a pair of bearing members arranged on a base;a rotary driver for rotating said feed screw in a proper direction;a feed nut engaged with said feed screw with rotation there

[ What is claimed is:] [1.] An actuator comprising:a feed screw having both ends respectively supported in a rotatable manner by a pair of bearing members arranged on a base;a rotary driver for rotating said feed screw in a proper direction;a feed nut engaged with said feed screw with rotation thereof being restricted by said feed screw, and movable in accordance with rotation of said feed screw;a slider attached to said feed nut;a pair of support members, located midway between said slider and said bearing members on both sides of said slider and movable in a feeding direction, for supporting said feed screw while positions of said support members are restricted in a direction perpendicular to said feeding direction; andcoupling means for coupling said base, said slider and said pair of support members in such a manner that when said slider moves, a moving speed of said pair of support members becomes a half of that of said slider, wherein said coupling means comprises:first coupling means, including a pair of first rotary bodies rotatably secured to both end portions of said base in said feeding direction and a first thread member placed around said pair of first rotary bodies and having both ends coupled to said pair of support members; andsecond coupling means, including a pair of second rotary bodies rotatably secured to said pair of support members and a second thread member placed around said pair of second rotary bodies and having both ends coupled to said slider and a center portion secured to said base.