| 摘要 |
PURPOSE:To detect a defective molded part due to the generation of short short through the non-arrival of molding pressure to the predetermined reference pressure and consequently prevent defective molding from occurring again in the following molding cycle by a structure wherein molding pressure detectors, pressure setting parts, comparing parts and a time counting part are provided. CONSTITUTION:Firstly, when injection is started, the count-clear signal of the counting part of a time circuit 45 is released, resulting in bringing the counting part into starting the couting by the counting part. If the levels of the outputs of the respective comparators in comparing parts 20 and 21, to which the signal issued from a molding pressure detector 13 is inputted, do not rise to the levels of reference pressure set in advance, a time counting part 40 outputs a lapse signal after the predetermined period of time, resulting in causing the output of a descriminator 51 to go to the 'H' reference level, lightening an alarm lamp and outputting the instruction for opening a molding die. Now, when all the detecting parts of molding pressure detectors detect the pressures exceeding the respective reference pressures, the shifting of process from the injection process to the following process is performed, resulting in preventing defective molding from occurring. |
