| 摘要 |
PROBLEM TO BE SOLVED: To restrain generation of noise such as collision noise of a gear in a link mechanism. SOLUTION: An outer peripheral wall 124a of a pin 124 slidably moves in a groove part 125 in a condition that the outer peripheral wall 124a of the pin 124 is brought into contact with two side walls 125a by forming second groove parts 126 extending almost parallel to the side walls 125a adjacent to the side walls 125a in a range of the groove part 125 wherein operation speed of a first link is rapidly increased. Thus, the pin 124 receives frictional force in a direction of reducing moving speed of the pin 124 from the side walls 125a in the range of the groove part 125 wherein the operation speed of the first link is rapidly increased. Therefore, the operation speed of the first link is prevented to be increased rapidly, and thereby the generation of the collision sound can be prevented.
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