Abstract: When a main switch (12) is turned ON, an electric operating machine (1) is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.

Abstract: When a main switch (12) is turned ON, an electric operating machine (1)is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.

Abstract: A power tool, which transmits a rotational force of an intermediate shaft to a tool bit, is provided with a gear which converts the rotational force of the intermediate shaft into a striking force in a rotation direction and transmits the striking force to the tool bit, an impact sleeve, a ball, a hammer, a cylinder, a gear which does not convert the rotational force of the intermediate shaft into the striking force in the rotation direction, a sleeve, a cylinder, a motion conversion mechanism for converting the rotational force of the intermediate shaft into a striking force in a linear motion direction and transmits the striking force to the tool bit, a piston, a striker, an intermediate member, a clutch for switching the transmission paths of the rotational force of the intermediate shaft and a slide gear.

Abstract: An impact tool includes: a motor; a controller configured to control driving power supplied to the motor using a semiconductor switching element; and a striking mechanism configured to continuously or intermittently drive a tip tool using a rotational force of the motor. The controller drives the motor by changing a PWM driving signal for driving the semiconductor switching element to mix a high-duty strike based on control of a high duty ratio and a low-duty strike based on control of a low duty ratio in one operation until a trigger is released after the trigger is pulled.

Abstract: When a main switch (12) is turned ON, an electric operating machine (1) is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.