Leveling height adjustment device of leveling member

摘要

(57) [Abstract] [Purpose] By preventing the backlash of the turning rails, improving the durability of the components involved in the turning rails. [Configuration] In addition to the outer peripheral edge portion of the rotating roller 43C and the tapered shape, and a portion abutting the rollers 43C for pivoting the rail 40A, and has a tapered shape to fit the shape of the outer peripheral edge of the rotary roller 43C. In addition, each rotating roller 43C, It has to be biased to the outside respectively by the coil spring 42b. Therefore, by the biasing force of the coil spring 42b, the entire edge of each rotating roller 43C is for close contact with the inner surface of pivot rails 40A, the vertical and horizontal directions of the rattling of the pivot rails 40A is minimize.