Patent ID: 7010951

Claim:
An improvement on a feeding mechanism of an automatic pipe bending machine, comprising a main part for securing a pipe thereto; the main part being displaceable along a plurality of guide rails secured on a main body of the bending machine; a first power source fitted to the main part; a transmission connected to the first power source such that a gear thereof will rotate when the first power source operates; a rack securely disposed on the main body of the bending machine; the gear of the transmission being engaged with the rack such that the main part will be displaced along the guide rails when the first power source operates; a second power source fitted to the main part; the second power source having a plurality of output rods; a plurality of second parallel guide rails secured on the main body of the bending machine; an auxiliary fixing member joined to the output rods of the second power source and displaceable along the second guide rails; a locating rod secured on the machine main body; the locating rod having engaging teeth formed along two lateral sides thereof; an engaging device fitted to the fixing member for releaseably engaging the toothed locating rod to fix the fixing member to the locating rod; the engaging device including: (1) a pair of pushing bars pivoted to the fixing member at lower end portions; the lower end portions of the pushing bars having eccentric convexly curved portions facing each other; (2) a third power source connected to upper end portions of the pushing bars for changing distance between the eccentric convexly curved portions of the pushing bars with; and (3) a pair of engaging blocks movably arranged between the eccentric convexly curved portions of the pushing bars and on two sides of the toothed locating rod; the engaging blocks having engaging teeth facing the engaging teeth of the locating rod; the engaging blocks being capable of engaging the locating rod when the pushing bars are moved such that the convexly curved portions thereof press the engaging blocks against the locating rod; the engaging blocks being capable of disengaging the locating rod when the pushing bars are moved such that the convexly curved portions are away from the engaging blocks; thereby being capable of being displaced by means of the second power source in addition to the first power source when the engaging blocks engage the locating rod, and when the second power source operates.