A robotic lawnmower system comprising a charging station (210) and a robotic work tool (100), the charging station comprising a signal generator (240) to which a boundary cable (250) is to be connected, the signal generator (240) being configured to transmit a signal (245) through the boundary cable (250), and the robotic working tool (100) comprising a sensor (170) configured to pick up magnetic fields generated by the signal (245) in the boundary cable (250) thereby receiving the signal (245) being transmitted and a controller (110) configured to analyse the picked up signal, wherein the signal generator (240) is further configured to: prefilter the signal through an filter model; and transmit the prefiltered signal to through the boundary cable (250) by means of a current generator.

A shearing mechanism is provided including a pair of blade units comprising shearing blades respectively; and a motion mechanism configured to move at least one of the pair of blade units along a predetermined trajectory in such a manner that a velocity thereof does not become zero while maintaining a relative posture of the pair of blade units, wherein the pair of blade units are configured to cut an object by overlapping the shearing blades of each other during the motion.

A blade protection cover coupled to a blade of a lawn mower apparatus includes a first cover for covering one face of the blade and two second covers connected to the first cover. The two second covers cover two edges of the blade in a width direction of the blade. Two guides are disposed on inner faces of the two second covers. The two guides are configured to guide the blade protection cover to slide along the two edges in the width direction of the blade.

Embodiments for implementing a harvester method, system, and apparatus are provided. For example, a harvester for produce may include a fluid knife system at a front end of the harvester in a travel direction of the harvester, wherein the fluid knife system projects a fluid at a pressure and a direction that cuts produce, a roller bar including one or more fingers extending radially outward and configured to receive produce from the fluid knife system, wherein the roller bar rotates on its axis turning the one or more fingers at the front end lifting the produce cut by the fluid knife system, a plurality of conveyers that receive the produce from the roller bar and are configured to transport the produce through the harvester, and a bin system configured to receive the produce from the plurality of conveyers and package the produce into one or more bins.

Embodiments for implementing a harvester method, system, and apparatus are provided. For example, a harvester for produce may include a fluid knife system at a front end of the harvester in a travel direction of the harvester, wherein the fluid knife system projects a fluid at a pressure and a direction that cuts produce, a roller bar including one or more fingers extending radially outward and configured to receive produce from the fluid knife system, wherein the roller bar rotates on its axis turning the one or more fingers at the front end lifting the produce cut by the fluid knife system, a plurality of conveyers that receive the produce from the roller bar and are configured to transport the produce through the harvester, and a bin system configured to receive the produce from the plurality of conveyers and package the produce into one or more bins.

A robotic lawnmower system, comprising a robotic lawnmower and a charging station, said charging station comprising a signal generator being configured to transmit a boundary signal (A) utilizing CDMA coding having a frame length corresponding to a full frame length through a boundary wire, wherein said signal generator is configured to transmit said boundary signal in subframes, and wherein said robotic lawnmower is configured to receive said boundary signal by detecting magnetic fields generated by the boundary signal, and wherein the robotic lawnmower is configured to determine a set of conditions; and to determine if said set of conditions correspond to a first set of conditions, and if so listen to the subframes, and to determine if said set of conditions correspond to a second set of conditions, and if so listen to the full frames.

A robotic lawnmower system comprising a charging station (210) and a robotic work tool (100), the charging station comprising a signal generator (240) to which a boundary cable (250) is to be connected, the signal generator (240) being configured to transmit a signal (245) through the boundary cable (250), and the robotic working tool (100) comprising a sensor (170) configured to pick up magnetic fields generated by the signal (245) in the boundary cable (250) thereby receiving the signal (245) being transmitted and a controller (110) configured to analyse the picked up signal, wherein the signal generator (240) is further configured to: prefilter the signal through an filter model; and transmit the prefiltered signal to through the boundary cable (250) by means of a current generator.

A robotic lawnmower system, comprising a robotic lawnmower and a charging station, said charging station comprising a signal generator being configured to transmit a boundary signal (A) utilizing CDMA coding having a frame length corresponding to a full frame length through a boundary wire, wherein said signal generator is configured to transmit said boundary signal in subframes, and wherein said robotic lawnmower is configured to receive said boundary signal by detecting magnetic fields generated by the boundary signal, and wherein the robotic lawnmower is configured to determine a set of conditions; and to determine if said set of conditions correspond to a first set of conditions, and if so listen to the subframes, and to determine if said set of conditions correspond to a second set of conditions, and if so listen to the full frames.

Walk behind power tools are provided. A walk behind power tool includes a housing; a power source; a motor selectively powered by the power source; a drive shaft; a handle; and a handle adjustment system. The handle adjustment system can be configured to move between different positions relative to the housing. The system can include a handle adjustment grip; at least one cable coupled to the handle adjustment grip at a first end and coupled to a locking wedge at a second end; and a spring. Engagement of the handle adjustment grip in a first direction enables the handle position to be moved relative to the housing. The power tool may have a plurality of cutting assemblies each powered by a respective motor. The power tool may be self-propelled and include a speed control assembly.

Walk behind power tools are provided. A walk behind power tool includes a housing; a power source; a motor selectively powered by the power source; a drive shaft; a handle; and a handle adjustment system. The handle adjustment system can be configured to move between different positions relative to the housing. The system can include a handle adjustment grip; at least one cable coupled to the handle adjustment grip at a first end and coupled to a locking wedge at a second end; and a spring. Engagement of the handle adjustment grip in a first direction enables the handle position to be moved relative to the housing. The power tool may have a plurality of cutting assemblies each powered by a respective motor. The power tool may be self-propelled and include a speed control assembly.