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    • 5. 发明公开
    • GUARD DETECTION SYSTEM FOR A POWER TOOL
    • 电动工具的防护检测系统
    • EP2969424A1
    • 2016-01-20
    • EP14778958.0
    • 2014-03-12
    • Robert Bosch GmbHKoegel, JanRobert Bosch Tool Corporation
    • KOEGEL, Jan
    • B27B5/38B23D47/12
    • B27G19/08B27G19/02Y10T83/141
    • A power table saw has a saw blade driven by a drive motor with power selectively supplied to the drive motor by actuation of a mains switch. A riving knife is provided that can be selectively positioned in an extended position and a retracted position relative to the blade. A blade guard is removably mounted to the riving knife in a position above the blade. A sensible element on the riving knife can be detected by a first sensor when the riving knife is retracted, the first sensor having a non-null state when the sensible element is adjacent the first sensor and a null state otherwise. A second sensor is configured to detect the presence of the blade guard and has a null state when the blade guard is detected and a non-null state otherwise. A controller is operable to determine the states of the first and second sensors and to disengage power to the drive motor when the mains switch is actuated when the states of the first and second sensors are different.
    • 功率台锯具有由驱动电机驱动的锯片,其中电力通过电源开关的启动选择性地供应给驱动电机。 提供的劈刀可以选择性地定位在相对于刀片的延伸位置和缩回位置。 刀片防护装置可拆卸地安装在刀片上方位置的劈刀上。 当劈刀缩回时,劈刀上的显着元件可以由第一传感器检测到,当显示元件与第一传感器相邻时,第一传感器具有非零状态,否则为零状态。 第二传感器被配置为检测刀片防护装置的存在,并且在检测到刀片防护装置时具有空状态,否则具有非空状态。 控制器可操作以确定第一传感器和第二传感器的状态,并且当第一传感器和第二传感器的状态不同时,当市电开关被致动时,断开到驱动马达的电力。