A method for sharpening cutting knives carried by a cutter drum in a housing of an agricultural vehicle includes: rotating the cutter drum while keeping a sharpening door closed so an overpressure is created inside the housing, the sharpening door shielding a sharpening stone from the cutting knives while creating the overpressure; opening a transition door of the housing below the cutter drum to eject crop material through the open transition door; opening the sharpening door to expose the cutting knives to the sharpening stone and closing the transition door; grinding one or more of the cutting knives with the exposed sharpening stone; and closing the sharpening door to shield the sharpening stone from the cutting knives after grinding.

A lawn mower includes: a rotation shaft coupled to a power source and extending in an approximately vertical direction a blade configured to rotate integrally with the rotation shaft and a housing having a downward opening and accommodating the blade such that the blade is rotatable; and a maintenance tool provided on the housing, the maintenance tool being contactable with the blade from the above. A cutting portion of the blade is capable of moving between a maintenance position at which the cutting portion is contactable with the maintenance tool and an operating position at which the cutting portion mows a lawn.

One example provides a grinding positioning plate for a reel-type mower unit including a cutting reel having a rotational axis. The grinding positioning plate includes a main body including a pivot element having a pivot axis, and at least one pair of clamping assemblies, each clamping assembly to clamp to a corresponding mounting flange of the reel-type mower unit to mount the main body to reel-type mower unit such that the pivot axis is in parallel with the rotational axis and at a known horizontal distance from the rotational axis.

One example provides a grinding positioning plate for a reel-type mower unit including a cutting reel having a rotational axis. The grinding positioning plate includes a main body including a pivot element having a pivot axis, and at least one pair of clamping assemblies, each clamping assembly to clamp to a corresponding mounting flange of the reel-type mower unit to mount the main body to reel-type mower unit such that the pivot axis is in parallel with the rotational axis and at a known horizontal distance from the rotational axis.

A blade cartridge for a horizontal rotary mower includes airfoil blades and diverter blades that alter airflow within the blade cartridge and prevent grass clippings from accumulating. The horizontal rotary lawnmower may be adapted to engage a cleaning station with brushes or cleaning pads to remove grass clippings while the horizontal rotary lawnmower blade assembly is operated in reverse. The cleaning station may automatically engage a reverse operation. The cleaning station may also hone the blades of the blade assembly while operating in reverse.

Provided are systems and methods for docking a robot relative to a lawn mower. The system may include a drive system configured to move the robot, a sensor, a docking arm, and/or at least one processor operatively connected to the drive system, the sensor, and/or the docking arm. The at least one processor may be configured to receive a signal from the sensor comprising a first location of the robot. The processor may be configured to control the drive system to drive from the first location to a second location based on receiving the signal. The at least one processor may be configured to control the docking arm to dock the robot at the second location, where the robot is configured to perform a task. The at least one processor may be configured to control the docking arm to un-dock the robot upon completion of the task.

Provided are systems and methods for docking a robot relative to a lawn mower. The system may include a drive system configured to move the robot, a sensor, a docking arm, and/or at least one processor operatively connected to the drive system, the sensor, and/or the docking arm. The at least one processor may be configured to receive a signal from the sensor comprising a first location of the robot. The processor may be configured to control the drive system to drive from the first location to a second location based on receiving the signal. The at least one processor may be configured to control the docking arm to dock the robot at the second location, where the robot is configured to perform a task. The at least one processor may be configured to control the docking arm to un-dock the robot upon completion of the task.

Provided are systems and methods for orientating a robot relative to a lawn mower. The system may include at least one processor configured to determine first object data associated with a first component of the lawn mower based on a first signal received from a sensor, where the first signal is detected at a first location. The processor may be configured to control a drive system to drive from the first location to a second location based on the first object data. The processor may be configured to determine second object data associated with a second component of the lawn mower based on a second signal received from the sensor, where the second signal is detected at the second location. The processor may be configured to control the robot to perform a task based on the second object data.

Provided are systems and methods for orientating a robot relative to a lawn mower. The system may include at least one processor configured to determine first object data associated with a first component of the lawn mower based on a first signal received from a sensor, where the first signal is detected at a first location. The processor may be configured to control a drive system to drive from the first location to a second location based on the first object data. The processor may be configured to determine second object data associated with a second component of the lawn mower based on a second signal received from the sensor, where the second signal is detected at the second location. The processor may be configured to control the robot to perform a task based on the second object data.