LEAD DECELERATION SCREW PRECISELY CONTROLLING LINEAR MOTION UNDER HIGH PRESSURE LOAD OF ROLLING MILL, INJECTION MOLDING MACHINE OR SAMPLE TESTER

摘要

PURPOSE: A lead deceleration screw is provided to control easily and precisely under high pressure load, to prevent reverse rotation of the ball screw, to reduce the size of the servo motor and to cut down manufacturing cost by forming the third lead finely. CONSTITUTION: A lead deceleration screw comprises a servo motor(58), a shaft(50) connected to a motor shaft(56) of the servo motor, a rotor screw(22) extended to the shaft by forming inner and outer thread grooves(32,30) in an operating member(28) in the lower part of the shaft, a stator ball nut(24) thread-connected to the outer thread groove of the rotor screw by forming a thread groove(44) in a main sleeve(42), and a pressure ball linear motion nut(26) thread-connected to the inner thread groove of the rotor screw by forming a thread groove(36) in a movable sleeve(34).