| 摘要 |
A groove is cut near the end of a roll to sever the end from the remainder of the roll. The roll is rotated by a high-power motor here called the spindle motor. A cutting tool which cuts the groove is mounted on a cross-slide which is driven towards and away from the work by a substantially lower-power motor here called the cutting-tool motor. The cross-slide carries the cutting tool into cutting engagement with the work or retracts the tool. The cross-slide motor may, independently of the spindle motor, be readily reversed to retract the tool from the work and again reversed to reengage the tool with the work. If the tool encounters excessive resistance the cutting-tool motor is reversed and the tool is retracted. The speeds of the spindle, on which the roll is rotated, and of the cutting-tool motor are controlled and coordinated so that the cutting of the groove is effected at a substantially constant chip load, that is, constant thickness of chip at a given rate. The chip load can be varied, to cut different materials, by changing the relationship between the spindle speed and the cutting-tool motor speed. The surface speed of the cutting is controlled by the distance between the cutting edge of the tool and the center of the roll and is maintained constant by a position potentiometer whose setting is determined by the radial position of the tool. The cutting-tool motor is moveable along the roll on a carriage which is itself moveable by the cutting-tool motor on the support for the roll. Hydraulic means is provided to secure the carriage to the support in the position where the cutting is to take place. In addition, the tool-holder support is subjected to high lateral thrust by a brace on the carriage. Irregular movement and chattering of the tool under the high stress to which it is subjected are thus prevented.
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