| 摘要 |
PURPOSE:To reduce a force, acting in the tangential direction at an arcuate part, at the time of revolving annularly-connected plural link-members, by providing die-housing parts to the inside of the proper number of the link-members. CONSTITUTION:For instance, plural link-members 103, 105, formed into an annular form by pivotally connecting them to each other, are provided freely revolvably. Lower die holders 19 and upper die holders 35, capable of freely housing dies 9D, 11D, are provided to the inside of the proper number of link-members 103, 105. Accordingly, a force in the tangential direction is prevented from becoming larger when the straightly moving parts of respective link-members 103, 105 transfer to the circular motion, because the gravity-centers of link-members 103, 105 are located in the inside. Therefore, a smaller motor can be used, and the positions of respective members 103, 105 are easily indexed. |
