FORWARD AND REVERSE ROTATING DEVICE FOR DOUBLE TUBE

PROBLEM TO BE SOLVED: To simultaneously rotate inner and outer tubes forward and reversely by one forward-reverse motor. SOLUTION: A rotating tube shaft 2 is installed in a machine box 1, a rotating cylinder shaft 3 is fitted on a common center line (c) on the lower outer circumference of approximately the intermediate section of the tube shaft 2, and an upper-stage driving gear 4 is mounted on the center line (c) in the tube shaft 2 and a lower-stage driving gear 5 on the center line in the cylinder shaft 3. An upper-stage pinion 8 engaged with the upper-stage driving gear 4 is set up to a vertical driving shaft 7 for a forward-reverse motor 6 fitted onto the top face of the machine box 1. Two mutually engaged intermediate gears 10' are interposed between a lower-stage pinion 9 engaged with the lower-stage driving gear 5 and the upper-stage pinion 8 and the upper-lower-stage driving gears 4, 5 are simultaneously rotated forward and reversely, and the upper and lower ends of the rotating tube shaft 2 are opened 2', 2a to the upper and lower sections of the machine box 1, and the forward-reverse rotating device is formed so that an outer tube 11 is connected at the lower end of the rotating cylinder shaft 3 and an inner tube 12 at the lower end of the tube shaft 2.