Abstract: The electric injection molding machine comprises a sensor 21, servo motor 15, a motor 23 and a controller 30 and, in a plasticizing process in which the motor 23 is rotated, the controller 30 performs control by repeating a first process in which the rotation of the servo motor 15 is controlled by a first retreating speed command value 33 to make the screw 13 retreat at a low speed when a screw backpressure signal is smaller than a backpressure set value 31 and a second process in which the rotation of the servo motor 15 is controlled by a second retreating speed command value 34 to make the screw 13 retreat at a high speed when the screw backpressure signal is larger than the backpressure set value 31.

Abstract: An injection molding machine comprises a pre-pressure addition means 2 adding a pre-pressure B acting in the opposite direction of a molding material pressure A received by a screw 1 to a detection means 3 and/or the screw 1, the detection means 3 detecting the axial pressures A and B of the screw, and a screw movement control means 4 controlling the axial pressure based on a different between the pre-pressure B and the molding material pressure A, wherein the pre-pressure addition means 2 is made non-contact with the direction means 3, a forward and backward driving motor 17 is disposed adjacent to a heating cylinder 10, and a screw connector 21 at the rear end of the screw 1 is spline-connected inside a rotating rotor of a screw rotating motor 12. According to the machine, the molding material pressure received by the screw can be accurately detected without being affected by the wear of the machine so as to properly control the axial pressure of the screw and to make the machine compact.

Abstract: An injection molding machine comprises a pre-pressure addition means 2 adding a pre-pressure B acting in the opposite direction of a molding material pressure A received by a screw 1 to a detection means 3 and/or the screw 1, the detection means 3 detecting the axial pressures A and B of the screw, and a screw movement control means 4 controlling the axial pressure based on a different between the pre-pressure B and the molding material pressure A, wherein the pre-pressure addition means 2 is made non-contact with the direction means 3, a forward and backward driving motor 17 is disposed adjacent to a heating cylinder 10, and a screw connector 21 at the rear end of the screw 1 is spline-connected inside a rotating rotor of a screw rotating motor 12. According to the machine, the molding material pressure received by the screw can be accurately detected without being affected by the wear of the machine so as to properly control the axial pressure of the screw and to make the machine compact.

Abstract: An injection molding machine comprises a pre-pressure addition means 2 adding a pre-pressure B acting in the opposite direction of a molding material pressure A received by a screw 1 to a detection means 3 and/or the screw 1, the detection means 3 detecting the axial pressures A and B of the screw, and a screw movement control means 4 controlling the axial pressure based on a different between the pre-pressure B and the molding material pressure A, wherein the pre-pressure addition means 2 is made non-contact with the direction means 3, a forward and backward driving motor 17 is disposed adjacent to a heating cylinder 10, and a screw connector 21 at the rear end of the screw 1 is spline-connected inside a rotating rotor of a screw rotating motor 12. According to the machine, the molding material pressure received by the screw can be accurately detected without being affected by the wear of the machine so as to properly control the axial pressure of the screw and to make the machine compact.

Abstract: The electric injection molding machine comprises a sensor 21, servo motor 15, a motor 23 and a controller 30 and, in a plasticizing process in which the motor 23 is rotated, the controller 30 performs control by repeating a first process in which the rotation of the servo motor 15 is controlled by a first retreating speed command value 33 to make the screw 13 retreat at a low speed when a screw backpressure signal is smaller than a backpressure set value 31 and a second process in which the rotation of the servo motor 15 is controlled by a second retreating speed command value 34 to make the screw 13 retreat at a high speed when the screw backpressure signal is larger than the backpressure set value 31.

Abstract: In a method for controlling a servomotor in an injection molding machine having a servo amplifier which outputs a driving current 16 according to a command signal 15 transmitted from a control device 1 and a servomotor 8 having an encoder 9 which is driven by the driving current 16, the encoder 9 transmits angular displacement data 13, 14 to the encoder 9 according to a request command supplied from the control device 1. The control device transmits a command signal 15 calculated based on the received angular displacement data 14 to the servo amplifier 6.

Abstract: An injection molding machine comprises a pre-pressure addition means 2 adding a pre-pressure B acting in the opposite direction of a molding material pressure A received by a screw 1 to a detection means 3 and/or the screw 1, the detection means 3 detecting the axial pressures A and B of the screw, and a screw movement control means 4 controlling the axial pressure based on a different between the pre-pressure B and the molding material pressure A, wherein the pre-pressure addition means 2 is made non-contact with the direction means 3, a forward and backward driving motor 17 is disposed adjacent to a heating cylinder 10, and a screw connector 21 at the rear end of the screw 1 is spline-connected inside a rotating rotor of a screw rotating motor 12. According to the machine, the molding material pressure received by the screw can be accurately detected without being affected by the wear of the machine so as to properly control the axial pressure of the screw and to make the machine compact.

Abstract: A mold clamping apparatus including a moving device for moving a movable plate relative to a stationary plate.

Abstract: In a method for controlling a servomotor in an injection molding machine having a servo amplifier which outputs a driving current 16 according to a command signal 15 transmitted from a control device 1 and a servomotor 8 having an encoder 9 which is driven by the driving current 16, the encoder 9 transmits angular displacement data 13, 14 to the encoder 9 according to a request command supplied from the control device 1. The control device transmits a command signal 15 calculated based on the received angular displacement data 14 to the servo amplifier 6.

Abstract: Mold clamping apparatus is disclosed which includes: an electrically-operated movable-platen-driving device of ball-screw type having a first ball-screw shaft supported by one of a movable and a rear platens, a first ball-nut threaded-engaged with the first ball-screw shaft and supported by the other of the movable and rear platens, and a movable-platen driving device for rotating the first ball-screw shaft and nut relative to each other so as to generate a relative longitudinal motion of the first ball-screw shaft and nut so that said movable platen is moved toward and away from a stationary platen to close and open the mold; a pressure-generating cylinder device having a pressure-generating piston moved by the relative longitudinal motion of the first ball-screw shaft and nut in order to generate a hydraulic pressure; and a mold clamping cylinder device adapted to generate a mold clamping force based on the hydraulic pressure applied from the pressure-generating cylinder device; and an engaging device which