| 摘要 |
PURPOSE:To suppress bending of a coupling shaft by a method wherein a coupling shaft to mutually intercouple first direction switching means or second direction switching means disposed in adjoining corner blocks is inserted in a guide pipe laid across a space between the corner blocks. CONSTITUTION:Corner blocks 16a, 16b, 16c, and 16d containing a first direction switching means to switch the directions of first endless strips 10a and 10b and second direction switching means to switch the directions of second endless strips 12a and 12b are arranged in the corners of a rectangular surface 14. Further, a coupling shaft 20 to mutually intercouple the first and second direction switching means is inserted in guide pipes 18a, 18b, 18c, and 18d. This constitution causes suppression of bending of the coupling shaft 20 to intercouple direction switching means by which the movement directions of the endless strips 10a and 10b are switched. |
