Power tools including electronic safety mechanisms with supervisory circuits. The power tools include a motor configured to generate a motive force, an implement holder, and an electronic safety mechanism. The implement holder is configured to receive the motive force from the motor. Receipt of the motive force generates driven motion of the implement holder. The electronic safety mechanism defines a disengaged configuration and an engaged configuration. The electronic safety mechanism includes a detection circuit configured to detect an actuation parameter and to generate a primary trigger signal based, at least in part, on the actuation parameter. The detection circuit also includes a detection circuit controller, which is programmed to control the operation of the detection circuit, and a supervisory circuit, which is configured to verify proper operation of the detection circuit controller.

A hand-held power tool, in particular a saber saw, having at least one holding unit for fastening the hand-held power tool to a holding device, in particular to an arresting cable and/or carabiner clip. The holding unit includes at least one receiving opening for receiving the holding device, and at least one damping element for damping a force transferred from the holding device to the hand-held power tool, in particular to a housing of the hand-held power tool. The damping element includes an at least substantially elastic element that at least partially encloses the receiving opening and receives in a form-fitting manner a fastening part delimiting the receiving opening.

The disclosure relates to a machine tool having a driveable tool and having a detection system for detecting contact between the tool and a user. The detection system has an excitation device for applying an excitation voltage signal to the tool, a current sensor for generating a current sensor signal that represents an electric current consumed by the tool, and a processing device for processing the current sensor signal in order to detect contact between the tool and the user. The processing device has an analog-to-digital converter and further devices arranged downstream of the analog-to-digital converter, comprising an IQ demodulator, a filter device and an evaluation device. The current sensor signal is able to be digitized using the analog-to-digital converter and processed in digital form using the further devices. The disclosure furthermore relates to a detection system for a machine tool.

A machine tool device includes at least one motor-driven machining tool; at least one sensor unit, in particular a capacitive sensor unit, which is configured to detect at least one foreign body in at least one detection area around the machining tool; and at least one open-loop and/or closed-loop control unit configured to trigger at least one action in accordance with at least one signal from the sensor unit. The sensor unit includes at least one antenna configured to emit at least one electric and/or magnetic field defining the at least one detection area and/or to detect the at least one foreign body in accordance with at least one change in at least one electric and/or magnetic field.

An electric working machine may include a support rod extending in a front-rear direction; a head unit attached to a front end of the support rod and including a front tool and a motor configured to drive the front tool; and a grip unit attached to a rear end of the support rod. The grip unit may include a grip housing configured to be gripped by an operator; a detection sensor attached to the grip housing and configured to detect an on/off operation for the motor by the operator; and a presence sensor attached to the grip housing and configured to detect a grip by the operator on the grip housing. The support rod may not penetrate through the grip housing. In a rear plan view of the electric working machine, at least one of the detection sensor and the presence sensor at least partially may overlap the support rod.

A safety system for use with a power tool that is usable by a user, the power tool including a base and a moving component that is movable relative to the base, includes a sensor assembly and a controller. The sensor assembly monitors a predetermined danger zone that is adjacent to the moving component of the power tool. The sensor assembly is configured to generate data relating to the predetermined danger zone. The controller receives the data from the sensor assembly and analyzes the data from the sensor assembly to determine if at least a portion of a hand of the user is present within the predetermined danger zone. The safety system can further include a wearable component including infrared only reflective material that is coupled to the hand of the user. The controller analyzes the data from the sensor assembly to determine if the wearable component is present within the predetermined danger zone.

A power tool and methods are provided for detecting objects (e.g., flesh or other materials) in the operating path of a power tool's output component (e.g., saw blade or drill bit). An object detection sensor in the power tool generates an output signal indicative of a type of material detected in the operating path of the power tool. A power tool controller receives the object detection sensor output and determines when a material in the operating path of the power tool changes. The controller changes operation of a motor of the power tool (e.g., increasing or decreasing speed or stopping the motor) in response to the detected material change. The object detection sensor may include, for example, an RF sensor, a capacitive sensor, a camera, a conductivity probe, or an ultrasound probe.

A power tool and methods are provided for detecting objects (e.g., flesh or other materials) in the operating path of a power tool's output component (e.g., saw blade or drill bit). An object detection sensor in the power tool generates an output signal indicative of a type of material detected in the operating path of the power tool. A power tool controller receives the object detection sensor output and determines when a material in the operating path of the power tool changes. The controller changes operation of a motor of the power tool (e.g., increasing or decreasing speed or stopping the motor) in response to the detected material change. The object detection sensor may include, for example, an RF sensor, a capacitive sensor, a camera, a conductivity probe, or an ultrasound probe.

A protective apparatus and a machine tool are provided. The machine tool includes an operational element, a driving element, and the protective apparatus. The operational element and the driving element are disposed on machine table. The protective apparatus includes an insulating unit, conducting unit, capacitance sensor, and control unit. The insulating unit is disposed between the operational element and the driving element. The driving element drives the operational element by the insulating unit. The conducting unit contacts the operational element. The capacitance sensor electrically connects the conducting unit for sensing capacitance of the conducting unit. The control unit electrically connects the capacitance sensor and the driving element and determines whether a user approaches the operational element based on the capacitance. When the control unit detects that the distance between the user and the operational element is too close, the control unit stops the operation of the operational element.

A power tool and methods are provided for detecting objects (e.g., flesh or other materials) in the operating path of a power tool's output component (e.g., saw blade or drill bit). An object detection sensor in the power tool generates an output signal indicative of a type of material detected in the operating path of the power tool. A power tool controller receives the object detection sensor output and determines when a material in the operating path of the power tool changes. The controller changes operation of a motor of the power tool (e.g., increasing or decreasing speed or stopping the motor) in response to the detected material change. The object detection sensor may include, for example, an RF sensor, a capacitive sensor, a camera, a conductivity probe, or an ultrasound probe.