Paris sonar controller for hollow molding machine and hollow molding machine having the same

摘要

PROBLEM TO BE SOLVED: To provide a driving method of a ball screw enabling sufficient and smooth lubrication with grease, on a contact surface of a screw shaft and a nut member and each ball, even under a use state where operation stroke is extremely small.;SOLUTION: In a parison thickness adjustment mechanism of a hollow molding machine, a die of an extrusion head and a core inserted into the die constitutes a discharge port, and a thickness of a parison is adjusted by lifting the core with a ball screw. A regular lifting stroke of the core is set less than a rotary movement amount of one rotation of each ball in the ball screw. In operation stop of the hollow molding machine, as fluttering operation of the ball screw, the core is lifted with reciprocative motion by a stroke not less than the rotary movement amount of one rotation of each ball.;SELECTED DRAWING: Figure 8;COPYRIGHT: (C)2018,JPO&INPIT