| 摘要 |
PURPOSE:To certainly avoid the occurrence of backlash by providing a balance weight of the same weight as that of an article and connecting the balance weight to the article so as to move the balance weight and article circulatively and to the directions opposite to each other in a seasaw moving device on which the article reciprocates. CONSTITUTION:A balance weight 5 of same weight W as that of an article 2 is provided in a device reciprocating the article 2 of comparatively great weight W on a body 1 having a seasaw motion mechanism 4. The article 2 and balance weight 5 are connected with each other through a connecting member 6 and provided so as to move circulatively to the directions opposite to each other. And the article 2 and balance weight 5 are provided in such a way that the middle point C of the distance 2L between the two is always shifted from the fulcrum 3 of the seasaw by E in relation to the position of the center of gravity. This always makes the fulcrum 3 work a moment M-2 WE anticlockwise for eliminating the occurrence of backlash. |
