Abstract: After molding is started, a large reaction force is obtained by compressing the air within a lower chamber by a piston while maintained in a sealing state. At an intermediate time of the molding, a small reaction force is obtained by communicating the upper and lower chambers with each other by a switching portion of a spool. At a final time of the molding, a large reaction force is again obtained by interrupting a flow path between the upper and lower chambers. The die cushion ability can be mechanically switched in association with the stroke of the piston, the die cushion device can be set such that no time lag is easily caused at a switching time, and the die cushion ability can be instantly switched.

Abstract: An apparatus for measuring weight of a substance placed within a substrate space which is subjected to sever conditions, including a measuring unit having a transducer and placed within a measuring space, a partition member provided between the measuring space and the substance space and having hole through which said measuring space is communicated with said substance space, a rod-like member extending through said hole formed in the partition member such that a first end of said force transferring member situates within said substance space and a second end of said force transferring member situates within said measuring space, a parallel link mechanism arranged within the measuring space and connected with the rod-like member, a magnetic fluid provided in a space within said hole such that said substance space and measuring space is isolated from each other in a liquid tight manner by means of said magnetic fluid, and a magnetic force generating unit producing a magnetic force such that said magnetic fluid