A ring cutter for transecting a ring trapped on an appendage. The ring cutter includes a body, a motor housed in the body, a blade drivingly connected to the motor, a guard coupled to the body, a guard actuator drivingly connected to the guard and controlling a movement of the guard, a current sensor positioned to sense electrical current associated with the motor, and a processor communicatively coupled to the current sensor and the guard actuator. The blade has a rotation axis and a peripheral cutting edge. The guard is insertable between the ring and the appendage to position the ring between the guard and the blade. The processor is configured to: i) receive, from the current sensor, an electrical current reading associated with the motor, and ii) transmit, to the guard actuator, one or more commands to control the movement of the guard based on the electrical current reading.

A dividing apparatus includes a table having a transparent plate having a holding surface for holding a workpiece thereon and a lower illumination unit for illuminating the holding surface from below, a first storage section for storing a first image including a white portion where illumination light from the lower illumination unit is transmitted through the workpiece and displayed as white and a black portion where the illumination light is blocked by the workpiece and displayed as black when an image of a kerf defined by a dividing unit in the workpiece held on the holding surface is captured by an image capturing unit with the lower illumination unit being energized, and a white pixel detecting section for detecting whether or not there are pixels in the white portion of the first image in directions perpendicular to directions along which a street extends.

A signal switch for a power tool has a paddle supported by a rocker that extends into a switch housing to pivot an actuating member. A circuit board is attached to a bottom of the switch. At least one micro-switch extends from the circuit board into the switch in position to be actuated by the actuating member depending on a position of the paddle. The circuit board includes a connector that is configured to connect to a cable, such as a ribbon cable. Circuit traces on the circuit board are electrically connected to the micro-switches and the electrical connector. The interior of the switch housing is sealed from the exterior environment so that the mechanical components of the switch are shielded from the environment.

A machine tool device includes at least one motorized machining tool, at least one, particularly capacitive, sensor unit, configured to detect at least one foreign body in at least one detection area around the machining tool, and at least one closed-loop and/or open-loop control unit configured to trigger at least one action depending on at least one signal from the sensor unit. The sensor unit includes at least one antenna configured to emit at least one electrical and/or magnetic field, which defines the at least one detection area, and/or to detect the at least one foreign body depending on at least one change in the at least one electrical and/or magnetic field.

A method of cutting a workpiece with a band saw is disclosed herein. The method includes rotating, with a band saw machine, a blade about a central longitudinal axis. The method also includes moving, with the band saw machine, the blade and a workpiece relative to the other to form a cut in the workpiece. The method also includes supporting a back edge of the blade at a first position before a lateral entry position of the cut or a second position after a lateral exit position of the cut with a first back support member. The method also includes extending an extension arm of the first back support member to shift the back edge a first distance rectilinearly along the central longitudinal axis toward the workpiece, wherein the shifting is cumulative to rectilinear movement from the moving.

An adjustable mounting assembly for a table saw fence includes an elongate track for connecting to a table saw. A carriage is supported by and movable longitudinally on the track for carrying the fence such that the fence extends across a tabletop of the table saw. An incremental adjustment wheel mechanism is rotatably supported by the carriage and interengages the track. The adjustment wheel mechanism is rotated a selected amount to adjust the position of the carriage on the track. The track carries an electronic sensor strip and a digital readout attached to the carriage movably cooperates with the electronic sensor strip for measuring and displaying the longitudinal position of the carriage on the track and the position of the fence relative to the saw blade.

A reciprocating saw includes a housing, a motor positioned within the housing, and a shoe coupled to the housing. The shoe is configured to engage a workpiece. The reciprocating saw also includes a proximity sensor configured to detect the workpiece when engaged with the shoe. In response to the proximity sensor detecting formation of a gap between the shoe and the workpiece, the proximity sensor is operable to deactivate the motor.

A system and a method for improving safety in a cutting saw apparatus is disclosed. The system comprises an RC oscillation circuit connected to a cutting saw, a detection module to detect changes in the output of the circuit and a control module that controls the operation of the cutting saw. The user wears a conductive footwear when working with the cutting saw. The system also comprises a conductive layer disposed beneath the conductive footwear and the oscillation circuit to establish a conductive path. The user also wears hand gloves to enable working with conductive, non-conductive and semi-conductive materials. When the user's hands comes into contact with the cutting saw, the resistance characteristics of the circuit changes, resulting in a change in the output signal of the circuit. This change is detected by the detection module which triggers the control module to stop the cutting saw.

A rotatable member is mountable on a tabletop of a power tool apparatus. The rotatable member includes a first work surface and a second work surface. The first work surface is on a first side of the rotatable member. The second work surface is on a second side of the rotatable member. The second side is different from the first side. The rotatable member is configured to move into a first position such that the first work surface is level with a surface of the tabletop. In addition, the rotatable member is configured to move into a second position such that the second work surface is level with the surface of the tabletop.

Apparatus for high voltage power line maintenance and repair. In some embodiments, a power tool has a housing which encloses an electrical load and a control electronics circuit using a first shield as a layer of conductive material which is open at a battery pack receiving slot of the housing configured to receive a removable battery pack. A removable boot surrounds the removeable battery pack and has a second shield as a layer of conductive material which combines with the first shield to form a combined shield that nominally encloses the power tool and the boot. An insulative hot stick supports the power tool at a distal end and a user interface at a proximal end. The user interface includes a communication circuit that communicates with the control electronics circuit via a non-conductive communication link that extends along the hot stick to selectively activate the electrical load.