Patent ID: 6884054

Claim:
A rotary compressive molding machine for powder material wherein a rotary table is rotatably arranged in a frame through an upright shaft, a die having a die hole is arranged on the rotary table, an upper punch and a lower punch are kept above and below the die in a vertically slidable condition and powder material filled in the die hole is compressed and molded between a lower face of the upper punch and an upper face of the lower punch by pushing the upper punch and the lower punch so as to approach each other with their tip inserted into the die hole, comprising a powder lubricant supplying means that supplies the upper face of the lower punch, the lower face of the upper punch and the die hole with powder lubricant prior to filling the powder material, wherein the powder lubricant supplying means comprises a powder lubricant supplying portion that stores powder lubricant and sends out the stored powder lubricant continuously, a flow quantity detecting portion having a light transparent detecting pipe inside of which the powder lubricant flows, that optically detects a flow quantity of the powder lubricant sent out from the powder lubricant supplying portion and flows inside of the detecting pipe, a retrieved quantity detecting portion that detects a quantity of superfluous powder lubricant other than the powder lubricant actually used while the powder material is compressed and molded based on the quantity detected by the flow quantity detecting portion, and a control portion that computes a quantity of the powder lubricant to send out based on a quantity detected by the flow quantity detecting portion and the retrieved quantity detecting portion respectively and controls the powder lubricant supplying portion so as to send out the powder lubricant at a computed quantity.