| 摘要 |
PURPOSE:To prevent occurrence of bite-in phenomena of screws by fixing a lead screw shaft in the condition that a matching gauge is first screw fitted on a pair of tapered screws and then the leads of the two screws are put in alignment, and by advancing the tapered screws along the lead screw upon removal of the gauge. CONSTITUTION:A threaded groove 29 formed in a matching gauge 27 is screw fitted on a tapered screw member 1, and another tapered screw member 2 is screw fitted in a threaded groove 30. Here a basis 26 is supported afloat, so that alignment of the threaded groove 30 with the screw member 2 will be made naturally, and the screw member 2 is pushed by coil springs 7, 7 when it has run against the gauge 27 to provide certain screw fitting. Now a solenoid 9 is energized, and a lead screw 4 is fixed so as not to be capable of advancing and retracting. Then a motor 21 is rotated in the reverse direction to remove the screw member 2 from the gauge 27, and the gauge 27 is also retracted to disengage the screw member 1 from the threaded groove 29. Thus the gauge 27 is put apart from its position between the members 1, 2. The motor 21 is now rotated in the regular direction to advance the cylinder 12 and screw member 2 according to the lead of the lead screw shaft 4, and the screw member 2 is accurately screw fitted with the screw member 1. |
