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    • 3. 发明授权
    • Variable feed high-production precision machine
    • 可变进料高精度精密机
    • US4106375A
    • 1978-08-15
    • US569543
    • 1975-04-18
    • Felix J. GurdakFrancis W. Cook, Jr.
    • Felix J. GurdakFrancis W. Cook, Jr.
    • B23Q5/28B23Q5/34B23Q15/22G05B19/06B23B3/32
    • B23Q15/22B23Q5/28B23Q5/341G05B19/066Y10T409/302968Y10T82/2527Y10T82/2535
    • A high-production, precision machine tool has means for varying the feed rate of the tool during the actual machining of each workpiece. The means comprise a plurality of program cams disposed on the camshaft of the machine tool for selecting the appropriate feed rate at the desired time during the machining operation. The camshaft is rotated by a permanent magnet D.C. motor, and as the camshaft rotates, the program cams, in turn, trip a plurality of switches to gate one of several predetermined voltage signals representative of the desired motor speeds to a comparator which compares the gated signal with the output of a tachometer measuring the actual motor speed. The difference, a voltage signal representative of the correction to be made to the motor, is applied to a silicon controlled rectifier firing circuit which selectively fires an SCR network, generating a shaped pulse to provide a controlled voltage input to the motor, thereby selectively controlling its speed.
    • 高精度的精密机床具有在每个工件实际加工期间改变刀具进给速度的装置。 该装置包括设置在机床的凸轮轴上的多个程序凸轮,用于在加工操作期间在期望的时间选择合适的进给速率。 凸轮轴由永磁直流电动机旋转,并且随着凸轮轴的转动,程序凸轮又将多个开关跳闸到代表期望的电动机速度的若干预定电压信号中的一个到比较器,比较器 信号与转速计的输出测量实际电机转速。 代表对电动机进行校正的电压信号的差异被施加到选择性地触发SCR网络的可控硅整流器点火电路,产生成形脉冲以向电动机提供受控电压输入,从而选择性地控制 它的速度。