A working machine may include: a first blade; a second blade overlapping with the first blade in an up-down direction; and a holding unit configured to hold the first blade and the second blade overlapping each other in the up-down direction. The first blade may be configured to reciprocate in a direction perpendicular to the up-down direction with respect to the second blade. The first blade may include a first elongated hole having a longitudinal direction along the reciprocating direction. The second blade may include a second elongated hole having a longitudinal direction along the reciprocating direction. The holding unit may include: a holding part inserted in the first elongated hole of the first blade and the second elongated hole of the second blade; and an outer sleeve having a cylindrical shape and supported by the holding part such that the outer sleeve is rotatable around the holding part.

A cutting knife includes a base coupled to a head unit of an agricultural combine harvester. The cutting knife includes a blade extending away from the base. The blade includes an edge and a plurality of cutting teeth formed from the edge. The plurality of cutting teeth includes a first grouping of teeth positioned along the edge having a first pitch. The plurality of cutting teeth includes a second grouping of teeth positioned along the edge having a second pitch less than the first pitch. The first grouping of teeth is positioned closer to an end of the blade opposite the base than the second grouping of teeth.

A cutting knife includes a base coupled to a head unit of an agricultural combine harvester. The cutting knife includes a blade extending away from the base. The blade includes an edge and a plurality of cutting teeth formed from the edge. The plurality of cutting teeth includes a first grouping of teeth positioned along the edge having a first pitch. The plurality of cutting teeth includes a second grouping of teeth positioned along the edge having a second pitch less than the first pitch. The first grouping of teeth is positioned closer to an end of the blade opposite the base than the second grouping of teeth.

A cutter bar lockout mechanism for a header of an agricultural vehicle. The cutter bar lockout mechanism includes a shaft having a first end that is coupled to a frame of the header, and a second end that is positioned either on, within or adjacent a cutter bar support arm (arm) of the header. An upper stop is either mounted to the shaft or forms part of the shaft and is configured to selectively interact with an upper surface of the arm. A lower stop is either mounted to the shaft or forms part of the shaft and is configured to selectively interact with a lower surface of the arm. The shaft is movable relative to both the frame and the arm between an unlocked position and a locked position.

A cutter bar lockout mechanism for a header of an agricultural vehicle. The cutter bar lockout mechanism includes a shaft having a first end that is coupled to a frame of the header, and a second end that is positioned either on, within or adjacent a cutter bar support arm (arm) of the header. An upper stop is either mounted to the shaft or forms part of the shaft and is configured to selectively interact with an upper surface of the arm. A lower stop is either mounted to the shaft or forms part of the shaft and is configured to selectively interact with a lower surface of the arm. The shaft is movable relative to both the frame and the arm between an unlocked position and a locked position.

A header includes one or more vibration sensors mounted on a knife drive train of the header. The knife drive train includes a rotatable header drive shaft, a mechanical knife drive, a transmission for transferring rotation of the drive shaft to the knife drive and a support member with a set of knives attached thereto. The support member is coupled to the knife drive so as to undergo a reciprocating movement. One or more sensors are mounted on the support member or on a housing of the knife drive. The sensors are configured to measure a vibration in a direction of the reciprocating movement. The sensors may include accelerometers or strain gauges.

A header includes one or more vibration sensors mounted on a knife drive train of the header. The knife drive train includes a rotatable header drive shaft, a mechanical knife drive, a transmission for transferring rotation of the drive shaft to the knife drive and a support member with a set of knives attached thereto. The support member is coupled to the knife drive so as to undergo a reciprocating movement. One or more sensors are mounted on the support member or on a housing of the knife drive. The sensors are configured to measure a vibration in a direction of the reciprocating movement. The sensors may include accelerometers or strain gauges.

An adjustable skid shoe enabling a flexible cutter bar of an agricultural combine harvester to follow the ground at a higher cut height during the flex cutter bar mode. The adjustable skid shoe is hinged and can be fixed so the curved aft end lowers the ground contact surface beneath the header, raising the cut height in flex mode. The adjusted skid shoe contacts the ground further back from the cutter bar, allowing the cutter bar to reach close to the ground by a front pivot of the header on the adjusted skid shoe. Also, an agricultural vehicle header and an agricultural combine harvester comprising the skid shoe.

An adjustable skid shoe enabling a flexible cutter bar of an agricultural combine harvester to follow the ground at a higher cut height during the flex cutter bar mode. The adjustable skid shoe is hinged and can be fixed so the curved aft end lowers the ground contact surface beneath the header, raising the cut height in flex mode. The adjusted skid shoe contacts the ground further back from the cutter bar, allowing the cutter bar to reach close to the ground by a front pivot of the header on the adjusted skid shoe. Also, an agricultural vehicle header and an agricultural combine harvester comprising the skid shoe.

In order to reduce crop losses in the region of the knife bar, a double knife cutting system (11) includes a first part of the knife blades (18a) present on the cutting unit (2) are fastened to a first knife back (20a), this first part of the knife blades (18a) together with the first knife back (20a) forming the upper knife (22), a second part of the knife blades (18b) present on the cutting unit (2) being fastened to a second knife back (20b), this second part of the knife blades (18b) together with the second knife back (20b) forming the lower knife (24), the upper knife (22) and the lower knife (24) being driven in opposite directions, and, of the rocker arms (34), a first rocker arm (34) being drive-connected to the upper knife (22) and a second rocker arm (34) being drive-connected to the lower knife (24).