| 摘要 |
PURPOSE:To facilitate fitting a rack and eliminate the need for adjustment of parallelism, by a construction wherein a flexible rack is disposed to be turnable with an end thereof as a center, a roller is supported on a carriage through a shaft so as to be opposed to a pinion of a moving motor in a radial direction, and the rack is clamped between the roller and the pinion. CONSTITUTION:When the moving motor 6 is driven to rotate a rotary shaft 7 forward, the pinion 8 integral with the shaft 7 is rotated in mesh with the rack 10 to generate a thrust, whereby the carriage 1 is moved in a fixed direc tion along a guide shaft 4. When the shaft 7 is reversely rotated, the pinion 8 is also reversely rotated, and the carriage 1 is moved in the direction opposite to the above-mentioned direction. Though the rack 10 tends to be disengaged through the force generated by the rotation of the pinion 8, a part meshed with the pinion 8 is pressed against the pinion 8 by a roller 9 supported through a shaft on an arm part 3 of the carriage 1, so that the meshing of the rack 10 and the pinion 8 is constantly secured, and an error in parallelism between the guide shaft 4 and the rack 10 and a play between the rack 10 and the pinion 8 are absorbed. |
