PURPOSE: To apply a stable boosted or decreased pressure on a work in a pump simultaneously with the forced feed of a work.
CONSTITUTION: A cylinder body 1 is provided, and a guide groove 1a formed in a spiral shape and changing a pitch 5 at every one round is formed in the inner side surface of the cylindrical body 1. A resilient tube 2 having a specified length is spirally wound around the guide groove 1a. A drive shaft 3 is rotatably supported on the axis of the cylindrical body 1 at the two ends thereof on a drive shaft 3 and through, for example, a bearing. Three rollers 4 are supported at the same specified pitch as each other in parallel to and on the same periphery as that of the drive shaft 3 through a support member. Further, a resilient tube 2 having length enough to allow spanning between one end and the other end of the resilient tube 2 is pressed by each pump roller 4.
ABE SHUNICHI
OISHI KOICHI
