A ring saw includes a ring saw blade, a tool holder that guides the ring saw blade in a cutting plane, a receiving space in which the tool holder is disposed, a motor, and a driving wheel where the ring saw blade is drivable in the cutting plane by the driving wheel and the driving wheel is coupled to the motor. A guide roller is disposed on a side of the cutting plane where the ring saw blade is guidable by the guide roller from the side and where an outlet of a water flushing system is directed at the guide roller.

ring saw includes a ring saw blade, a tool holder that guides the ring saw blade in a cutting plane, a motor, and a driving wheel where the ring saw blade is drivable in the cutting plane by the driving wheel and the driving wheel is coupled to the motor. The driving wheel is mounted in a bearing block so as to be rotatable about a drive axis perpendicular to the cutting plane. The bearing block is movable parallel to the cutting plane.

A method of aligning a saw unit and a base. The saw unit further includes a front bevel angle adjustment bracket proximate a front end of the base and a rear bevel angle adjustment bracket proximate a rear end of the base. The saw unit further comprises a first fastener extending through a first elongated slot in one of the base or the front bevel angle adjustment bracket and a second fastener extending through a second elongated slot in one of the base or the rear bevel angle adjustment bracket. Each of the first and second elongated slots extends along a lateral axis oriented transverse to the longitudinal axis of the base to permit lateral adjustment of the saw unit relative to the base.

A method of aligning a saw unit and a base. The saw unit further includes a front bevel angle adjustment bracket proximate a front end of the base and a rear bevel angle adjustment bracket proximate a rear end of the base. The saw unit further comprises a first fastener extending through a first elongated slot in one of the base or the front bevel angle adjustment bracket and a second fastener extending through a second elongated slot in one of the base or the rear bevel angle adjustment bracket. Each of the first and second elongated slots extends along a lateral axis oriented transverse to the longitudinal axis of the base to permit lateral adjustment of the saw unit relative to the base.

The disclosure provides an electric cutting tool. The electric cutting tool includes a working assembly, a driving assembly and a housing. The driving assembly is connected with the working assembly and drives the working assembly to operate. At least part of the driving assembly is arranged inside the housing. The housing includes an inlet and a magnetic component arranged at the inlet.

An electric working machine in one aspect of the present disclosure includes: a motor; a driver to drive the motor; a first control circuit; and a second control circuit. The first control circuit controls the driver such that the motor rotates in a set rotation direction. The second control circuit is provided separately from the first control circuit. The second control circuit detects a rotation direction of the motor and performs an abnormality handling process to stop rotation of the motor in response to a situation where the detected rotation direction is reverse to the set rotation direction.

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 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 power tool has a functional component, a motor, a power supply module, a controller and a drive circuit including a first drive terminal and a second drive terminal respectively electrically connected to a first power terminal and a second power terminal of the power supply module, multiple high-side switches wherein high-side terminals of the high-side switches are respectively electrically connected to the first drive terminal, and multiple low-side switches wherein low-side terminals of the low-side switches are respectively electrically connected to the second drive terminal. The controller is configured to output a first control signal to one high-side switch to place it in an on or off state and output a second control signal to one low-side switch to place it in the other state. The low-side terminal of one high-side switch is connected to the high-side terminal of one low-side switch.

A power tool has a functional component, a motor, a power supply module, a controller and a drive circuit including a first drive terminal and a second drive terminal respectively electrically connected to a first power terminal and a second power terminal of the power supply module, multiple high-side switches wherein high-side terminals of the high-side switches are respectively electrically connected to the first drive terminal, and multiple low-side switches wherein low-side terminals of the low-side switches are respectively electrically connected to the second drive terminal. The controller is configured to output a first control signal to one high-side switch to place it in an on or off state and output a second control signal to one low-side switch to place it in the other state. The low-side terminal of one high-side switch is connected to the high-side terminal of one low-side switch.