| 摘要 |
PURPOSE:To equalize the initial tensions of the wires of both side pulley devices by constituting said wires of one common wire, installing 2 pairs of mobile pulleys on both sides of the carriage of an original platen, and stretching the wires in a symmetrical state having a symmetrical axis at the center of the moving direction of the carriage. CONSTITUTION:When a driving drum 14A is rotated, a wire C is pulled in the arrow F1 direction, and in the arrow F2 direction via a mobile end pulley 12A on one side, and a wire C2, C2 is also pulled. A wire C is pulled via the other mobile end pulley 12B, a driving drum 14B, a mobile end pulley 13B, a mobile pulleys 18B, 18A, further, a fixed pulley 16A, and finally from the driving drum 14A. When the driving drums 14A, 14B are rotated, since the mobile pulleys 18A, 18B, 19A, 19B are rotatable, the driving force of the wire C exerted from both sides is balanced and the carriage 17 is moved by the moved length. |
