Abstract: A gardening tool with identification function including an operating unit and a working unit is provided. The operating unit includes a first main body, a first electrical connector, and an operating device. The first electrical connector is set at one end of the first main body. The operating device includes a processor electrically connected to the first electrical connector. The processor stores operating parameters. The working unit includes a second main body, a second electrical connector, a motor, and a work piece. The electrical property of the second electrical connector is corresponding to one operating parameter in the processor. When the second main body is connected to the first main body, the second electrical connector is electrically connected to the first electrical connector. The processor selects one operating parameter according to the electrical property of the second electrical connector to control the output rotational speed or power of the motor.

Abstract: A controller of a DC brushless motor and a control method thereof are disclosed. The controller is connected to a commutation circuit including three voltage dividers and three comparators. Each voltage divider includes a first resistor and a second resistor connected in series. Each first resistor is connected to a terminal voltage of three-phase coils of the DC brushless motor. Each comparator includes a positive input end connected to a node connected to the first resistor and the second resistor of the corresponding voltage divider and a negative input end connected to the node of the adjacent voltage divider. The controller includes a control circuit and three bias resistors respectively connected to a voltage source and the node of the corresponding voltage divider. The control circuit detects a counter EMF signal of each phase coil and controls the voltage source to supply an offset voltage to the corresponding node.

Abstract: A connection tube for a power tool, adapted to be engaged with and disposed inside a sleeve tube of the power tool is disclosed. The connection tube is characterized in that: at least one first section and at least one second section are formed on an exterior surface of the connection tube; the at least one section is a curved surface located at a periphery of a first imaginary circle which could be joined to an interior surface of the sleeve tube when the connection tube is engaged with the sleeve tube, and the at least one second section is a convex-concave structure having a plurality of first hill portions and a plurality of first valley portions which are alternatively arranged, wherein crests of the first hills do not exceed the periphery of the first imaginary circle.

Abstract: A transmission device for a power-driven cutting tool includes a base, a transmission component, a linking component, a shaft component and a link component. The base has a through cavity, a sleeve and a receiving portion. The transmission component is penetratingly disposed in the through cavity, so as to couple the transmission component and the base together. The linking component is penetratingly disposed in the sleeve, so as to couple the linking component and the base together. The shaft component and the link component are disposed in the base. A power source drives the linking component and thereby sequentially drives the shaft component, link component, and transmission component, allowing a cutter of the power-driven cutting tool to undergo reciprocating displacements along a linear path for performing a cutting operation. The transmission device features enhanced structural rigidity, allowing the cutter to move back and forth along a linear track.

Abstract: A turbo transmission mechanism for brush cutter is disclosed to include a casing defining therein a lubricant storage chamber, a transmission shaft rotatably mounted in the casing and partially inserted into the lubricant storage chamber, a transmission gear set mounted in the lubricant storage chamber of the casing and including a first bevel gear and a second bevel gear coaxially mounted at the transmission shaft and meshed with the first bevel gear for enabling the transmission shaft to be rotated by the second bevel gear during rotation of the first bevel gear by a power source, and a turbo mounted in the lubricant storage chamber and rotatable with the transmission shaft to stir up the lubricant in the lubricant storage chamber, enhancing heat dissipation.