| 摘要 |
PURPOSE:To obtain a titled mechnism simple in mechnism, light in weight and free from restriction by an object to be welded by rotating a link adjacent to the first link in reverse direction by the same angle together with rotation of the first link of a parallelogram link mechanism having a torch. CONSTITUTION:In a parallelogram link mechanism consisting of the first-fourth links 9, 17, 18 and 20, a torch 1 is installed to make AB=OE, where A is the center of rotation of a rotation transmitting mechanism 30, and B, E are joints and 0 is the welding position. When a shaft 10 is rotated by a motor and the link 9 rotates in the direction 23 by alpha deg., a gear 13 which is in mesh with a gear 12 rotates in the direction 24, and a gear 15 which is in mesh with the gear 13 rotates in reverse direction by alpha deg. as the number of teeth of the gear 15 is the same as that of the gear 12. Assuming intersection of DE and extension of AO as O', AB' E' and O' forms a parallelogram as B' C' D' and E' form a parallelogram. Accordingly, points O and O' coincide, and the aiming position is not changed even when the link 9 is rotated. Consequently, torch angle can be changed without changing the aiming position of the torch 1 by using one driving source. |
