| 摘要 |
PURPOSE:To reduce the inertia of a driving system and permit the often and quick control, such as starting, stoppend, speed changing and the like, of an injection member by a method wherein one set of an injection member is driven by a rotary motion-straight motion converting mechanism connected to a plurality of servomotors respectively. CONSTITUTION:Resin pressure in an injection cylinder 2 is detected by a lood cell and two sets of servomotors 5 are rotated reversely to retreat an injection member 1 so as to obtain an uniform resin pressure. The amount of resin is controlled by the rotating number of an absolute encoder PG so as to obtain a predetermined value. When the amount of resin in an injection cylinder 2 arrives at a predetermined value, two sets of servomotors 5 begin normal rotations by an injection start signal, two sets of ball screws 7b are rotated through a gear coupling 15 and two pieces of thrust nut 7a move forward straightly on the ball screws 7b. One set of thrust composition member 7c, connected to both of two pieces of the thrust nut 7a, are moved straight while being guided by a guide arm 13 and the injection member 1 injects resin molding material in the injection cylinder 2 into a mold from a nozzle 2a through a connecting member 1a engaged with the thrust member 7c. |
