Origin return mechanism null of the injection molding machine Drive with the electromotive servo-motor

摘要

PURPOSE: To decrease errors in original point detection and thus perform control correctly by providing a detecting means and a position detector for detecting the original point of an injection driving device, clamp device and ejector, and making the driving of a corresponding servomotor stop by an original point- determination means at the time of receiving one rotational signal from the position detector. ;CONSTITUTION: A position detector PS is provided on an injection servomotor MS for shifting a screw to the axial direction by an injection driving device 2, and a position detector PC is also provided on a clamping servomotor MC for driving a clamping device 4 to open and close a mold. Furthermore, a position detector PE is provided on an ejector servomotor ME for driving an ejector 5. A sensor SS serves to perform the positioning of an injection molding machine, and in the same manner, a sensor SC serves to detect the original point position of the clamping device 4, and a sensor SE acts to detects the original point position of an ejector 5. As each detector means detects the original point, they receive one rotational signal from each detector means and stop the driving of each servomotor.;COPYRIGHT: (C)1995,JPO