Abstract: In a computer system suitable for effecting a sequence control and a servo-control, programs are prepared by using three types of parallel processing instructions consisting of an open instruction, a close instruction is issued from a first program for parallelly processing a second program. The close instruction is issued from the first program to terminate the first or second program. The pause instruction is issued from the first program to stop execution of the first program for a definite interval.

Abstract: In a nozzle pressing and contacting process, a mold clamping process, and an injection process in an injection molding operation, a movable side, such as constituting a nozzle portion or screw of an injection apparatus, or a movable mold of a molding apparatus, is moved towards and contacted with a stationary side, such as constituting a mold or molding machine, or a stationary mold under a speed controlled condition. When the movable side approaches the stationary side, the pressure acting on the stationary side is measured and when the measured pressure reaches a predetermined set pressure, the speed control is switched to a pressure control to accurately and smoothly bring the movable side into contact with the stationary side.

Abstract: An injection molding machine generally comprises a heating cylinder, a screw rotated and reciprocated in the heating cylinder and a screw drive system. The screw drive system comprises two motors and two sensors connected respectively thereto which are automatically controlled by a control system in connection with a screw revolution number and a screw back pressure, or independently so as to accurately carry out the resin measuring process. The control system performs an adaptive control of a motion control system inclusive of the screw and the screw drive system in response to a screw speed instruction, a screw revolution number feedback signal, and a screw position feedback signal in accordance with various control modes.

Abstract: An injection molding machine generally comprises a heating cylinder, a screw rotated and reciprocated in the heating cylinder and a screw drive system. The screw drive system comprises two motors and two sensors connected respectively thereto which are automatically controlled by a control system in connection with a screw revolution number and a screw back pressure, or independently so as to accurately carry out the resin measuring process. The control system performs an adaptive control of a motion control system inclusive of the screw and the screw drive system in response to a screw speed instruction, a screw revolution number feedback signal, and a screw position feedback signal in accordance with various control modes.