PROBLEM TO BE SOLVED: To enable threshing depth adjustment processing to be performed by detecting a culm length of a reaped grain culm and to avoid disadvantages such as grain dropping during conveyance of a reaped grain culm and prevention of conveyance of a reaped grain culm.SOLUTION: A combine includes a reaping processing part 3 reaping a planted grain culm to be conveyed toward a threshing device rearward. The reaping processing part 3 includes: a grain culm conveyance device 16 conveying a reaped grain culm to a threshing device 4 and a culm length detection device 32 of a contact type detecting a culm length of a reaped grain culm conveyed by the grain culm conveyance device 16. The culm length detection device 32 can be switched between an action state Q1 detecting and acting on a reaped grain culm conveyed by the grain culm conveyance device 16 and a non-action state Q2 retreating from a conveyance route of a reaped grain culm and not detecting and acting on a reaped grain culm.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】刈取穀稈の稈長を検出することにより、扱深さ調節処理を行うことが可能でありながら、刈取穀稈の稈長を検出する必要がない場合には、刈取穀稈の搬送中に脱粒したり、刈取穀稈の搬送を妨げる等の不利を回避することが望まれていた。【解決手段】植立穀稈を刈り取って後方の脱穀装置に向けて搬送する刈取処理部3が備えられ、刈取処理部3に、刈取穀稈を脱穀装置4に向けて搬送する穀稈搬送装置16と、穀稈搬送装置16にて搬送される刈取穀稈の稈長を検出する接触式の稈長検出装置32とが備えられ、稈長検出装置32が、穀稈搬送装置16にて搬送される刈取穀稈に対して検出作用する作用状態Q1と、刈取穀稈の搬送経路から退避して刈取穀稈に対して検出作用しない非作用状態Q2とに切り換え可能に設けられている。【選択図】図3
