Abstract: An injection molding system includes a program control section installed outside injection molding machines. The program control section includes a program file section that stores a plurality of different programs in the form of files, and a program transfer section that selects a computer program from the program file section and transfers the selected computer program to the controller of an arbitrary injection molding machine when the arbitrary injection molding machine is operated. Only when an injection molding machine is operated, a program (control program) for operating the injection molding machine is selected from the program file section of the program control section, and the thus-selected program is transferred to the corresponding controller by the program transfer section.

Abstract: A controller for a molding machine can easily revise control-parameters. To achieve the object, the controller comprises: a first input unit for inputting control-parameters of the molding machine; a display unit for showing a graph of a control-pattern of the molding machine, which is defined on the basis of the control-parameters, on a screen; a second input unit for revising the graph on the screen to define a revised control-pattern; a calculator for calculating revised control-parameters, which correspond to the revised control-pattern, when the control-pattern is revised; a memory for storing the control-parameters and the revised control-parameters; and a control unit for storing the control-parameters in the memory, showing the graph of the control-pattern on the display unit, calculating the revised control-parameters by the calculator when the graph is revised, and storing the revised control-parameters in the memory.

Abstract: A concrete feeding tube, hereinafter referred to as a "tremie tube", is used to feed concrete grout or the like underwater. This tremie tube consists of an outer tube having desired rigidity and a number of through-holes, and an inner tube having desired pliability, the lower end of the inner tube being adapted to be closed with a closure means. The tremie tube is so designed as to be lowered vertically into a body of water with the lower end of the inner tube being closed with the closure means. So lowered, water is introduced through the aforesaid through-holes inwardly of the wall of the outer tube so as to collapse the inner tube with a resulting decrease in buoyancy of the tremie tube. When the lowered end of the outer tube reaches the water bed then fresh hardening-material, such as concrete grout, is fed into the inner tube under pressure so as to inflate the inner tube.