WORKPIECE TRANSFER APPARATUS, VALVE GRINDING MACHINE PROVIDED WITH SAME, WORKPIECE TRANSFER METHOD, AND VALVE GRINDING METHOD

摘要

A workpiece transfer apparatus (5) for inputting and dispensing an engine valve (V) having an umbrella portion (Vb) into and out of a three-jaw hollow chuck (70) having a hollow part (72) and jaws (71), is provided with: a slider (41) which is capable of advancing toward or retreating from the three-jaw hollow chuck; a grip section (421) which is provided on the slider in a manner so as to be able to oscillate, and which grips the handle-side end section (Vc) of the engine valve; and a cam roller (46) and a cam groove (161) which oscillate the position of the grip section in accordance with the advance or retreat of the slider, and which can oscillate the position at which the engine valve is gripped by the grip section, between a directly-facing position facing toward the axial direction, and a tilting position which is tilted at a prescribed angle. When the slider advances toward the three-jaw hollow chuck, the grip section oscillates the engine valve, in compliance with the cam groove and the cam roller, from the tilting position toward the directly-facing position, and puts the umbrella portion into the three-jaw hollow chuck.