| 摘要 |
PURPOSE:To eliminate backlash not only in the rear gap but also in the diameter fitting section, by proving a notched part to the screw thread of a helicoid and a rear gap eliminating member which is projected into the screw groove of the opposite helicoid and also is engaged with one side surface of the groove to the notched part. CONSTITUTION:A rear gap eliminating member 4 is adjusted the screwed amount of a roller shaft 41 into a helicoid cylinder 2 and a roller 42 fitted to the roller shaft 41 is engaged with one side surface of a screw groove 3a of the helicoid of an operating ring 3. An elastic member 43 is one for stabilizing the roller shaft 41 at the screwed-in position, such as a spring washer. The screwed- in amount of the roller shaft 41 can be adjusted by rotating the roller shaft 41 with a screw driver through an adjusting hole 3b provided to the operating ring 3. In this way, backlash not only in the rear gap, but also in the diameter fitting section, can be eliminated. |
