Patent ID: 7461577
Filing Date: 2008-12-09
Classification: B23B,Y10T

Abstract:
1. A bar material supply device of a numerically controlled automatic lathe arranged after the numerically controlled automatic lathe having a headstock and a spindle rotatably supported on the headstock so that a front end of a bar material is inserted through a through-hole of the spindle to project from a front end of the spindle, and the front end of the bar material is machined by a tool mounted on a tool post, the bar material supply device being characterized by comprising: a stocker to supply the bar material on an axis of the spindle; a push rod disposed after the stocker to move back and forth on the axis of the spindle; a push rod guide to guide the back-and-forth movement of the push rod; a plurality of rollers arranged on both sides of the axis to hold the push rod on the axis therebetween, one of the plurality of rollers being constituted as a driving roller which is rotated by a driving body, and at least one of the other rollers excluding the driving roller being constituted as a driven roller which is rotated without any slippage with the push rod; and rotation detection means for detecting the rotation of the driven roller.