Patent ID: 8814559
Filing Date: 2014-08-26
Classification: B29C

Abstract:
1. A mold clamping apparatus for an injection molding machine, comprising: a motor disposed at a rear plate; a ball screw operated by the motor, the ball screw being oriented in a horizontal direction; a crosshead coupled to the ball screw so that, when the ball screw rotates, the crosshead moves away from or toward the rear plate; a stationary plate and the rear plate connected to a tie bar; and a movable plate disposed between the stationary plate and the rear plate, the movable plate being arranged for movement away from or toward the rear plate by links comprising a first link, a second link and a third link, wherein, a first end of the first link forms a joint along with a first-side extension of the rear plate, a first end of the second link forms a joint along with a portion that protrudes outwards from a side surface of the first link, a second end of the second link forms a joint along with the crosshead, a first end of the third link forms a joint along with a second end of the first link, and a second end of the third link forms a joint along with a second-side extension of the movable plate, wherein when the movable plate is moved toward the rear plate, the first link extends from its first end in a direction away from the ball screw and the second end of the first link moves toward the rear plate, the second link extends from its second end in a direction away from the rear plate and away from the ball screw and the third link extends from its second end in a direction toward the rear plate and such that its first end is vertically more distant from the ball screw than its second end, and wherein when the movable plate is moved away from the rear plate, the first link becomes horizontally oriented and extends from its first end in a direction away from the rear plate and the second link becomes vertically oriented.