Patent attributes
It is an object of the invention to provide a technique for preventing power tool from being operated by a malfunction of the control circuit. A representative driving power tool includes a movable element, a drive unit to drive the movable element, an actuation circuit to actuate the drive unit, a control circuit and an operation switch that outputs an operation signal. The control circuit outputs a control signal when the operation signal for instructing driving of the movable element is outputted from the operation switch. The actuation circuit actuates the drive unit when the control signal is outputted from the control circuit. Actuation of the drive unit is blocked when the control signal outputted from the control circuit is abnormal. According to the invention, a movable element can be prevented from being moved by malfunctioning of the control circuit.
