| 摘要 |
PURPOSE:To have an automatic grinding of a workpiece for sickle by forming the standard curve, to be produced in the surface on the sickle's major part, with two circular arcs with different radii, bound continuously and by using two swing units, arranged in combination, with different swinging radii in compliance with said two different circular arcs. CONSTITUTION:On the foundation 1, No.1 swing unit 4 is installed in such a manner as capable to swing with a shaft 16 as the center, over which No.2 swing unit 5 is installed in such a way as capable of swinging with another shaft 15 as the center. A workpiece for a sickle A is mounted in a recess 6 provided at No.2 swing unit 5 and ground by an abrasive belt. At the time of grinding, No.2 swing unit 5 swings with a radius of r1 driven by a hydraulic cylinder 9 through a connecting rod 8 to grind the base part of the sickle and, when No.2 swing unit 5 contacts a pin 14, the No.1 and No.2 are consolidated and swung with a radius of r2 to grind till the foremost of the sickle with a quickened operating speed of the hydraulic cylinder and with the circumferential speed in swinging being held constant. |
