(57) [summary] [purpose] two of the movable member is one of the driving means by the left and right opposite directions and accuracy is good and easy handling and a linear actuation unit that is precisely driven compact inexpensive linear actuation unit I provide. [Configuration] rolling elements provided with a left-hand thread portion and a right threaded portion provided on the left-hand thread portion and the right threaded portion guide the screwed independently each nut block and each of the nut block to the rail in one of the feed screw The rolling elements are disposed between the rolling element rolling grooves provided in the rolling grooves and the nut block, the feed to the guide rail along with the slidable nut blocks axially through the rolling of the rolling elements It was freely adjusted to the desired axial position via a spacer between the relative position of the screw. [Effect] By control of one of the feed screw it is possible to obtain left and right opposite precise operation of the two nuts blocks, it is easy to finely adjust the relative positional relationship between each of the nut blocks, moreover, be incorporated into the same guide rail it requires only a simple and bulky parts also less handling because to have.
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