PURPOSE: To apply a stable boosted and decreased pressure on a work in a pump simultaneously with the continuously forced feed of a work.
CONSTITUTION: A spiral type tube pump is provided with a cylindrical body 1 and a guide groove 1a formed in a spiral state and changing a pitch 5 at every one round is formed on the inner side surface of the cylindrical body 1, and a resilient tube 2 is spirally wound around the guide groove 1a. A protrusion part 2a matched with the guide groove 1a is formed on the outer peripheral surface of the resilient tube 2 in a slow twisting manner in conformity with the guide groove 1a. A drive shaft 3 is rotatably supported on the axis of the cylindrical body 1 at the two ends on the body l through, for example, bearings. Three pump rollers 4 are supported by the drive shaft 3 in parallel to the drive shaft 2 and on the same periphery and the same specified pith as each other. A resilient tube 2 is pressed by each pump roller 4.
ABE SHUNICHI
OISHI KOICHI
