Abstract: A harvester has a supporting frame pivotally mounted on a body at a rear portion thereof, a hydraulic cylinder device for supporting the frame at an downwardly inclined position. A screw conveyer means comprising a pair of screw conveyers is rotatably supported on the frame. The screw conveyer device includes a pick up section for picking up capitate vegetables and a transfer section for transferring pickup vegetables to a rear portion of the screw conveyer device. A working section is provided at a rear portion of the body for treating picked up vegetables.

Abstract: A rotary tilling device has a cutting device having a plurality of cutters each of which is rotatably mounted on a supporting member. The cutter has a vertical portion and a lateral portion at an end of the vertical portion and has edges on both sides of the vertical and lateral portions. The cutter is held by a stopper in a tilling position when rotated in a tilling direction, and is released in a grass cutting position when rotated in the opposite direction.

Abstract: A rotary tilling device has a cutting device having a plurality of cutters each of which is rotatably mounted by a bolt on a supporting member at a base end thereof. The cutter has a vertical portion and a lateral portion at an end of the vertical portion and has edges on both sides of the vertical and lateral portions. A stopper for receiving the cutter in a tilling position and a spring plate for resiliently holding the cutter in the tilling position are provided on the supporting member.

Abstract: A rotary tiling device has a cutting device having a plurality of cutters each of which is mounted on a supporting member at a base end thereof in such a manner that the cutter is rotatable about a first center. The cutter has a vertical portion and a lateral portion at an end of the vertical portion and has edges on both sides of the vertical and lateral portions. The base end has an arcuated periphery about a second center. The first center is offset from the second center, so that in grass cutting operation, the arcuated periphery is positioned in a position which is further outward than its position in the soil cutting operation.

Abstract: A cultivator has a blade secured to a frame. The blade is downwardly projected from the frame and has an edge at the forward side thereof. An air injector is provided at a lower portion of the blade. A swing arm is provided to move in accordance with the depth of the injector in the soil. A switch produces a signal when the swing arm moves to a predetermined position at which the injector is positioned at a sufficient depth for aerating the soil. In response to the signal, a valve is opened to supply the compressed air to the injector.

Abstract: A cultivator has a blade secured to a frame. The blade is downwardly projected from the frame and has an edge at the forward side thereof. An air injector is provided at a lower portion of the blade. The frame is supported with the blade and the injector above the ground by a pair of supporting wheels and a stand which are changeable to a criss-crossed stored position to permit the cultivator to be moved downwardly to its operative position.

Abstract: A cultivator has a blade downwardly projected from a frame, an injector provided at a lower portion of the blade, a compressor mounted on the frame and an air tank for storing air compressed by the compressor. An unloading valve provided in a hydraulic circuit for supplying compressed air in the air tank to the injector. The unloading valve is arranged to be opened when the pressure in the air tank is higher than a predetermined value. A master valve is provided in the circuit means, for passing the compressed air to the injector. A mechanical valve is provided to be opened when the depth of the injector reaches a predetermined value, so that the compressed air is supplied to the master valve to open it, whereby air is injected from the injector when the pressure in the air tank is higher than the predetermined value at the predetermined position of the injector.