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    Automatic screwdriver or torquing tool control system
    6.
    发明授权
    Automatic screwdriver or torquing tool control system 失效
    自动螺丝刀或扭力刀具控制系统

    公开(公告)号：US4562389A

    公开(公告)日：1985-12-31

    申请号：US536194

    申请日：1983-09-27

    Applicant: Wolfgang Jundt ,  Gunter Schaal ,  Fritz Schadlich ,  Hans-Joachim Vogt ,  Steffen Wunsch

    Inventor： Wolfgang Jundt ,  Gunter Schaal ,  Fritz Schadlich ,  Hans-Joachim Vogt ,  Steffen Wunsch

    IPC: B25B23/151 ,  B23P19/06 ,  B25B23/14 ,  B25B23/147 ,  H02H7/085 ,  H02P29/00 ,  H02P7/00

    CPC classification number: H02H7/085 ,  B23P19/066 ,  B25B23/147 ,  Y02P70/185

    Abstract: To permit reliable turn-OFF of the motor when the torque of the motor is sufficient to provide for reliable seating of a screw or nut being driven thereby, start conditions of the motor are sensed, either in form of low-current condition or high power factor; high-torque conditions are sensed by low power factor, or high-current, in dependence on the desired torque level which results, respectively, in a comparatively steep phase angle-torque or current level-torque curve. A switch control is energized to turn-OFF the motor current if the phase angles, or the motor current, respectively, are beyond predetermined levels. To prevent in-rush current, or high power factors from affecting the operation of the turn-OFF system, timing circuits are provided to disable the turn-OFF system when the motor is first turned-ON or if the phase angle difference, as determined by time-comparator networks, between current and voltage, is below a predetermined value. Timing duration of at least one of the timing circuits can be controlled as a function of motor temperature to provide for linear response of the system, regardless of changes of motor operating parameter versus torque characteristics under varying motor temperature conditions.

    Abstract translation: 为了允许马达的可靠关闭，当马达的扭矩足以提供由其驱动的螺钉或螺母的可靠安置时，电动机的起动条件以低电流状态或大功率的形式被感测 因子; 根据分别在相对较陡的相位角 - 转矩或电流电平 - 转矩曲线中产生的期望转矩水平，通过低功率因数或大电流检测高扭矩条件。 如果相位角或电动机电流分别超过预定水平，则开关控制器通电以关闭电动机电流。 为了防止浪涌电流或高功率因素影响关断系统的操作，提供定时电路以在电动机首次接通时禁止关闭系统，或者如果确定了相位角差 通过时间 - 比较器网络，在电流和电压之间，低于预定值。 可以根据电动机温度的不同来控制至少一个定时电路的定时持续时间，以提供系统的线性响应，而不管电动机工作参数对变化的电动机温度条件下的转矩特性的变化。

    Method and apparatus for shutting off a power screwdriver
    7.
    发明授权
    Method and apparatus for shutting off a power screwdriver 失效
    用于切断电动螺丝刀的方法和装置

    公开(公告)号：US4463293A

    公开(公告)日：1984-07-31

    申请号：US477624

    申请日：1983-03-22

    Applicant: Friedrich Hornung ,  Wolfgang Jundt ,  Fritz Schadlich ,  Hans-Joachim Vogt ,  Steffen Wunsch

    Inventor： Friedrich Hornung ,  Wolfgang Jundt ,  Fritz Schadlich ,  Hans-Joachim Vogt ,  Steffen Wunsch

    IPC: B25B23/155 ,  B25B21/00 ,  B25B23/14 ,  H02P3/06 ,  H02P1/22 ,  H02H7/085

    CPC classification number: B25B23/14 ,  B25B21/00

    Abstract: A power screwdriver that is equipped with a spring coupling between the motor drive and the tool spindle, a signal that indicates that a certain value of torque has been overstepped, at which the screwdriver must be sopped, first causes reversal of the motor, but before the motor appreciably turns in the reverse direction, powers shut-off, allowing the motor to coast. After another brief interval, power is reapplied to the motor in the original direction, again briefly. In this way it is possible for the final shut-off to occur when the motor is stopped and the spring is unstressed, avoiding oscillations of the motor-spring system. A triac bridge circuit makes possible quick reversals and brief applications of power. In such a bridge circuit, precautions must be taken to be sure one pair of triacs is extinguished before the other pair is ignited.

    Abstract translation: 一个电动螺丝传动装置，在电动机驱动器和工具主轴之间配有一个弹簧联轴器，一个指示扭矩已经超过某一特定值的信号，螺丝刀必须在其上被挤压，首先会引起电机的反转，但之前 电机明显转向相反方向，电源关闭，允许电机滑行。 在另一短暂的时间间隔之后，再次简单地向原始方向重新施加电动机。 以这种方式，当电机停止并且弹簧不受应力时，可能发生最终关断，避免电机 - 弹簧系统发生振动。 三端双向可控硅开关桥电路可以实现快速反向和功率的简单应用。 在这样一个桥接电路中，必须注意确保一对三端双向可控硅开关在另一对点火之前熄灭。

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