| 摘要 |
PROBLEM TO BE SOLVED: To obtain a constant pressure mechanism suitable for a contact type measuring apparatus or the like which achieving a simple structure, a smaller size and moreover, a smaller internal, friction resistance. SOLUTION: In a constant pressure mechanism to energize a driven member, being guided in a fixed direction, in one direction by an elastic force of a coil spring, there are arranged a pressure transmission member 3A to be guided in the same direction as the driven member done being energized by the coil spring, a rotary member 4A rotated centering around the center axis 5A of a case 1A where the pressure transmission member 3A is housed and the driven member being supported on the case 1A movably in straight. A displacement conversion mechanism is interposed between the pressure transmission member 3A, the rotary member 4A and the driven member. The displacement conversion mechanism is provided with a first link arm 6A pin joined between one end part of the rotary member 4A and the pressure transmission member 3A and a second link arm 14A pin joined between the other end part of the rotary member 4A and the driven member.
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