Abstract: A safety device for a machine tool includes a machine, a main controller, a detection unit, a warning system, a drive circuit and a temporary stop device. The detection unit includes a contact sensing element and a non-contact sensing element. After the detection unit is induced and triggered by a charged body, a sensing signal is generated and transmitted to the main controller and interpreted by the main controller to drive the warning system, and the drive circuit transmits an analog signal to a charged body of the temporary stop device to rotate a motor of the machine in a reverse direction for a brake. The present invention provides a double sensing protection device with both contact and non-contact sensing effects to improve the safety of using the machine tool and prevent operators from being injured.

Abstract: The safety device mainly contains a main controller, a detector, and an emergency braking member. The main controller contains a detection member connecting the detector, an alarm member producing visual or audible alarm, and a driving member for activating the emergency braking member to reverse or stop the motor of the machine tool. The detection member could be an electrostatic detection unit, or a capacitance detection unit, or a combination of the two. The detector is positioned on a top surface of a platform and in front of a saw of the machine tool. The detector could also be part of an axle of the saw so that the saw is effectively an extension of the detector and provides both cutting and safety functions.