JP6733109B2 - Threshing equipment - Google Patents

Description

The present invention relates to a threshing device provided with an emergency operation means for performing an emergency operation of stopping the rotation of a handling cylinder and opening an operation of a cover body.

A handling barrel that performs threshing treatment of grain culms by rotationally driving in the handling chamber, a cover body that opens and closes the handling chamber, and a grain culvert that is disposed on the side of the handling barrel and has the tips facing the handling barrel side. A feed chain that conveys the feed chain, a holding body that is provided on the cover body side, and that holds the stock side of the grain culm that is being conveyed together with the feed chain when the cover body is closed, and a lock member that locks the cover body in the closed state. A threshing device that includes a manually operable lock release lever and is capable of releasing the sandwiching between the sandwiching body and the feed chain by opening the cover body is conventionally known.

According to this threshing device, while performing the manual handling work of manually introducing the grain culm between the feed chain and the sandwiching body to perform threshing, foreign matter is caught between the feed chain and the sandwiching body. Even in the case of an emergency such as being pinched, by performing a predetermined emergency operation, the lock is released via the lock release device and the cover body is quickly opened, so that the nipping body and the feed chain A configuration capable of releasing the clamp is shown.

JP, 2014-158448, A

In the above-mentioned document, when the lock release device is operated, the lock release lever is operated to the lock release side to open the cover body and release the holding body and the feed chain. There is a problem that the unlocking operation of the unlocking lever may not be performed smoothly due to an overload on the actuator when the unlocking operation of the unlocking lever is performed.

The present invention relates to a threshing device equipped with a lock releasing device that rocks a lock releasing lever to a lock releasing side, which is a side where a lock is released, and a lock releasing operation of a lock releasing lever via an actuator of the lock releasing device. An object of the present invention is to provide a threshing device that can be executed more quickly and reliably.

In order to solve the above-mentioned problems, the present invention is, firstly, a handling barrel 9 for performing threshing treatment of grain culms by rotationally driving in the handling chamber 11, a cover body 13 for opening and closing the handling chamber 11, and the handling barrel. A feed chain 12 which is arranged on the side of 9 and conveys the grain culm with the tips facing the handling cylinder 9 side, and which is provided on the cover body 13 side and is being conveyed together with the feed chain 12 when the cover body 13 is closed. By the holding body 14 for holding the root side of the grain culm, the lock member 31 for locking the cover body 13 in the closed state, the manually operable lock release lever 28, and the swing operation of the lock release lever 28. A linkage mechanism 29 for mechanically linking the lock release lever 28 and the lock member 31 so that the lock by the lock member 31 is released, and a lock release of the lock release lever 28 on the side where the lock is released. A lock release device 58 for swinging the lock release lever 28 to the lock release side. The lock release device 58 rotates the cam member 61 in only one direction and a cam member 61 for swinging the lock release lever 28 to the lock release side. an actuator 63 to be driven, the position detecting sensor 64 for detecting the rotational position of the cam member 61, an operation switch 57, have a control unit, a peripheral portion of the cam member 61, rotation of the cam member 61 During operation, an action portion 61a that acts on the lock release lever 28 side to swing the lock release lever 28 toward the lock release side and a non-action portion 61b that does not act on the lock release lever 28 side are formed. The position detection sensor 64 is configured to detect a non-acting state in which the cam member 61 does not act on the lock release lever 28, and the control unit sets the non-acting state of the cam member 61 as an initial position. When the pushing operation of the operation switch 57 is detected, the cam member 61 is rotationally driven to unlock the cover body 13, and then the cam member 61 is stopped in a non-acting state. It is characterized by being configured as follows.

Second, the position detection sensor 64 is Installation to at least partially wrap position and rotation trajectory of the cam member 61, the cam member 61, the position detection sensor within the rotational locus of the cam member 61 It is characterized in that a contact piece 66 that abuts 64 is provided.

Thirdly, the lock release lever 28 and the lock device 26 are provided in a front-rear pair, and a front-rear direction interlocking mechanism 29 that links the front and rear lock release levers 28 is provided, and the lock release lever 28 is connected to the interlocking mechanism 29. It is characterized in that it is arranged so as to be vertically sandwiched by the cam member 61.

Fourthly, the lock release lever 28 is configured so that the interlocking mechanism 29 approaches the rotation fulcrum side of the lock release lever 28 in accordance with the lock release operation.

When the lock release device is operated, the control unit can operate the lock release lever by driving the cam member by the actuator to unlock the cover body and open the cover body. Compared to the case where the lock release lever is directly operated by driving a motor or the like, the load applied to the actuator can be reduced, and the cover body can be surely and quickly opened.

According to the cam member, a peripheral portion of the cam member is formed with an operating portion that abuts and acts on the lock release lever side and a non-acting portion that does not abut the rotational release side of the cam member. It is possible to prevent a situation in which the cam member acts on the lock release lever side and the cover body is unlocked unexpectedly when the cover body is locked.

In addition, the lock release lever and the lock device are provided in a front-rear pair, and a front-rear direction interlocking mechanism that links the front and rear lock release levers is provided. The operability is good because the cover body can be unlocked by unlocking the lock release levers on the front and rear sides. Further, by disposing the lock release lever so as to be sandwiched in the vertical direction by the interlocking mechanism and the cam member, the configuration for opening the cover body can be made more compact.

According to the lock release lever configured such that the interlocking mechanism approaches the rotation fulcrum side of the lock release lever when the lock release operation is performed, the lock operation lever is locked when the lock release lever is operated. Since it is possible to suppress an increase in the operation load of, the lock release operation by the lock release lever can be performed more smoothly.

It is a side view of a self-removing combine equipped with a threshing device to which the present invention is applied. It is a top view of a self-removing combine with a threshing device to which the present invention is applied. It is a principal part front view of a threshing apparatus. It is a principal part rear view of a threshing apparatus. It is a principal part perspective view of a threshing apparatus. (A) is a front view of a main part showing a flexible structure of an interlocking mechanism, and (B) is an exploded view showing a configuration of the interlocking mechanism. It is a principal part front view which showed the structure of the unlocking device. (A) And (B) is the figure which showed the operating state and non-operating state of a cam member.

1 and 2 are a side view and a plan view of a self-removing combine equipped with a threshing device to which the present invention is applied. The self-removing combine is connected to a traveling machine body 2 supported by a pair of left and right crawler traveling machines 1 and 1, and is connected to a front portion of the traveling machine body 2 so as to be able to move up and down to perform harvesting work of grain culms in a field. The reaper 3 is provided.

The traveling machine body 2 includes a cockpit 4 on which an operator gets in and performs various operations, and a threshing device that is arranged on the diagonally left rear side of the cockpit 4 and that threshes and sorts grain culms cut by the reaping unit 3. 6, a discharging unit 7 arranged behind the threshing device 6, and a grain tank 8 arranged right behind the cockpit 4 and on the right side of the threshing device 6 for storing grains.

3 to 5 are a front view of a main part, a rear view of the main part, and a perspective view of the main part of the thresher. The threshing device 6 is provided with a handling chamber 11 in which a cylindrical handling cylinder 9 extending in the front-rear direction is supported so as to be rotatable about its own axis, and is disposed outside the handling chamber 11 to convey the culm backward. A feed chain 12 in the front-rear direction, a cylinder cover (cover body) 13 rotatably supported on the frame body side of the traveling machine body 2 so as to open and close outside and above the handling chamber 11, and a lower end of the cylinder cover 13. A sandwiching rail (sandwiching body) 14 which is fixedly attached to the section and extends in the front-rear direction, a sorting chamber 16 formed below the handling chamber 11, and a sorting chamber 16 which is disposed immediately below the handling barrel 9 and is disposed near the handling barrel 9. And a receiving net 17 formed in an arc shape along the outer peripheral surface.

The handling cylinder 9 is rotationally driven around a rotation axis in the front-rear direction formed on the axis as a fulcrum. Specifically, it is handled between a front wall portion 18 integrally extending downward from the front portion of the cylinder cover 13 and a rear wall portion integrally extending downward from the rear portion of the cylinder cover 13. The barrel 9 is rotatably supported, whereby the handling barrel 9 is vertically rotated integrally with the cylinder cover 13. The cylinder cover 13 will be described later.

Further, a drive device 21 for transmitting engine power to the handling cylinder 9 to rotate it is installed on one of the front and rear walls (the front wall 18 in the illustrated example). The drive device 21 is provided with a braking mechanism that applies a braking force to the handling barrel 9 to stop the rotation, in addition to a transmission mechanism that transmits engine power to the handling barrel 9.

The sorting chamber 16 sorts the processed matter leaking from the side of the receiving net 17 into grain such as paddy and discharged matter such as straw debris by the sorting wind flowing backward and upward. The discharged matter is discharged from the rear end side of the traveling machine body to the outside of the machine, while the grains are transferred into the grain tank 8 and temporarily stored therein.

In the combine configured as described above, when the traveling machine body 2 is moved forward while the mowing unit 3 is lowered, the grain stalks mowed by the mowing unit 3 driven by mowing are transferred to the conveying device of the mowing unit 3. It is conveyed backward by 5 and passed to the front end side of the feed chain 12. The feed chain 12 clamps the stock side of the grain culm, which is inserted into the handling chamber 11 such that the tips thereof face the handling barrel 9 side, and clamps it together with the clamping rail 14 to convey it backward.

In the backward transportation process by the feed chain 12, the grain culm is handled by the handling barrel 9 (thresholding treatment) and becomes straw. In addition, the processed product that has been threshed in the handling chamber 11 leaks from the receiving net 17. It is fed down to the sorting chamber 16. The culms that have become straw are conveyed rearward by the straw chain 22 and discharged to the outside of the machine as they are, or they are discharged to the outside of the machine after being cut by a cutter or the like in the discharge part 7. On the other hand, as described above, the processed material is sorted into the discharged material discharged outside the machine and the grain contained in the grain tank 8 in the sorting chamber 16.

Moreover, as shown in FIG. 1, the combine of the above-mentioned composition WHEREIN: It switches to the hand side mode on the outer side surface of the threshing apparatus 6 front part (specifically, the outer side surface of the front part of the cylinder cover 13). A hand-handle switch 56 for performing the operation is provided. When the hand-handle mode is switched to the hand-handle mode by the hand-handle switch 56, the combiner stops the drive of the reaping unit, and the feed chain 12 and the handle barrel 9 are stopped. The threshing device that includes it is driven (see FIG. 1).

By being switched to the manual handling mode, the operator manually supplies the grain culm between the front end side of the feed chain 12 and the front end side of the sandwiching rail 14 to thresh the grain culm. It is possible to perform a manual operation for performing a sorting process.

By the way, the combine quickly stops the drive of the handling cylinder 9 when an emergency occurs in which a foreign substance is caught between the feed chain 12 and the sandwiching rail 14 during the above-mentioned manual handling work. At the same time, the cylinder cover 13 is quickly opened to release the nipping between the nipping rail 14 and the feed chain 12 (emergency operation), so that the state in which the foreign matter is caught can be quickly released. It has a section. Details will be described later.

As shown in FIG. 5, the cylinder cover 13 is formed in an angle shape so as to cover the upper and lateral sides of the handling chamber 11. The cylinder cover 13 is supported on the frame body side of the machine body so as to be vertically rotatable about an axis in the front-rear direction of its upper portion and left and right inner end portions (right end portion in the illustrated example) as a fulcrum. Due to this rotation, the cylinder cover 13 is rotated to the upper position so as to open the outer side and the upper part of the handling chamber 11 and the lower position so as to close the outer side and the upper part of the handling chamber 11. It is configured so that it can be switched to the closed posture rotated to the position.

Specifically, the cylinder cover 13 is provided with a lock device 26 that locks the cylinder cover 13 that has been switched to the closed posture, and a lock release lever 28 that releases the locked state of the cylinder cover 13 by the lock device 26. .. Further, a pair of the lock release lever 28 and the lock device 26 are provided in the front-rear direction of the cylinder cover 13, and in particular, the pair of lock release levers including the front lock release lever 28A and the rear lock release lever 28B is The interlocking mechanism 29 described later in detail is configured to interlock.

A grip portion 34 is formed on the tip side of each of the lock release levers 28 described above, so that the grip portion 34 can be pivoted up and down about a rotation fulcrum 35 in a state where the grip portion 34 is gripped. Overhangs. The front and rear lock members 31 are respectively supported by front and rear wall portions of the cylinder cover 13 so as to be vertically rotatable.

The lock device 26 is provided as a front lock device 26A and a rear lock device 26B as a pair in front and rear. Further, the front and rear locking devices 26 include lock members 31A and 31B that are supported by the cylinder cover 13 side so as to be vertically swingable and are formed in a hook shape, and lock pins 32 and 32 that are fixedly provided on the frame side. Link mechanisms (linkage mechanisms) 33, 33 for connecting the lock release lever 28 and the lock members 31A, 31B are provided in the front and rear, respectively.

In the lock device 26 having the above configuration, the lock member 31 is rotated downward (lock side) and hooked and engaged with the lock pin 32 so that the cylinder cover 13 is locked in the closed posture. On the other hand, by rotating the lock member 31 on which the lock pin 32 is hooked to the upper side (release side), the engagement between the lock pin 32 and the lock member 31 is released, and the cylinder cover 13 is locked. The unlocking operation to be released is performed.

As shown in the drawing, the link mechanism 33 that constitutes the front locking device 26A includes an intermediate arm 36 that is swingably supported at the center of the cylinder cover 13 in the left-right direction on the ceiling surface side, the intermediate arm 36, and the front unlocking lever. 28A, the operating side rod 37 in the left-right direction, the diagonal operating side rod 38 connecting the intermediate arm 26 and the lock member 31A, and installed between the operating side rod 38 and the lock member 31. It has an elastic member 39 such as a tension spring that urges the lock member 31A downward, which is the lock side (see FIG. 3).

In the front lock device 26A having the above structure, the operation side rod 37 is displaced outward by the swing of the front lock release lever 28A to the upper side (release side), whereby the operation side rod 38 is displaced upward. The lock release operation described above is performed.

On the other hand, as shown in the figure, the link mechanism 33 that constitutes the rear lock device 26B is provided between the rod 41 in the left-right direction that connects the rear lock release lever 28B and the lock member 31B, and between the rod 41 and the lock member 31B. And an elastic member 42 such as a tension spring that biases the lock member 31B toward the lock side (see FIG. 4).

In the rear lock device 26B having this structure, the rod 41 is displaced outward by the swinging of the rear lock release lever 28B toward the upper side (release side), whereby the lock release operation described above is performed.

According to the cylinder cover 13 having the above-described configuration, when the lock device 26 installed in the threshing device 6 enters a locked state (locked state) in the closed posture, the sandwiching rail 14 is positioned in the vicinity immediately above the feed chain 12. Is configured to. In this state, the grain culm is sandwiched and held by the feed chain 12 and the sandwiching rail 14 so that it can be conveyed backward.

The cylinder cover 13 is constantly urged toward the open position (opening direction) by a pair of front and rear gas springs 27, and the front and rear locking devices 26 are unlocked to open the cylinder cover 13. Operate. At this time, the holding rail 14 provided on the cylinder cover 13 side is also rotated upward with the opening operation of the cylinder cover 13, whereby the holding rail 14 is separated from the feed chain 12, and the holding of the grain stem is released. Is configured to be.

Next, the configuration of the interlocking mechanism will be described with reference to FIGS. FIG. 6A is a front view of a main part showing the structure of the interlocking mechanism, and FIG. 6B is an exploded view showing the configuration of the interlocking mechanism.

The interlocking mechanism 29 includes a plate-shaped base end portion 46 connected to the base end side serving as a fulcrum of rotation of the rear unlocking lever 28B, and a tubular shape extending from the base end portion 46 toward the front side. Support portion 47, a rod-shaped rod member 48 having one end connected to the support portion 47 and extending to the front lock release lever 28A side, and a front lock release lever 28A side provided on the front end side of the rod member 48. A plate-shaped contact piece 49 having a contact pin 49a for contacting with. The interlocking mechanism 29 is supported and fixed to the cylinder cover 13 side by fixing parts 51, 51 formed on the supporting part 47 and the rod member 48.

The support portion 47 is provided with a shaft portion 52 on the front end side which is formed in a tubular shape and on which the rod member 48 is externally mounted, and the rod member 48 is attached to the support portion 47 side via the shaft portion 52. It is rotatably connected. Further, the contact piece 49 is vertically swung in accordance with the axial rotation of the rod member 48, and the contact pin 49a is contacted with the contact portion 30 provided in the middle portion of the front lock release lever 28A from above. It is configured to abut (see FIG. 5).

According to the interlocking mechanism 29 having the above configuration, when the front lock release lever 28A is rocked to the upper side (lock release side) from the lock position where the front lock release lever 28A is rocked downward, the front lock release lever 28A side is locked. The abutment portion 30 abuts against the abutment pin 49a and pushes the rod up, whereby the rod member 48 is axially rotated, and accordingly, the rod member 48 axially rotates the support portion 47 side. 28B is rocked to the upper side (lock release side).

In other words, when the front lock release lever 28A is unlocked, the rear lock release lever 28B is also unlocked via the interlocking mechanism 29, and only the front lock release lever 28A is unlocked. Then, the locks of the front and rear locking devices 26A and 26B are released.

By the way, as shown in FIG. 6(A), the front end side of the support portion 47 and the rear end side of the rod member 48 are connected (fitted) to each other with the notches 47a and 48a formed therein. The support portion 47 and the rod member 48 are connected to each other with a flexible structure that allows axial rotation of only one side within a range in which the ends of the cutouts 47a and 48a in the axial rotation direction do not come into contact with each other.

Specifically, when the front and rear lock release levers 28 are at the lower position (lock position), only the rear lock release lever 28B is manually swung to the upper side (lock release side). Since the notch of the support portion 47 that rotates axially with the rocking of the lock release lever 28B rotates freely without contacting the notch on the rod member 48 side, even if the lock release operation of the rear lock release lever 28B is performed. The rear lock device 26B is unlocked without interlocking with the front lock release lever 28A.

Further, when the front lock release lever 28A is manually rocked downward (lock side), the front lock release lever 28A does not act on the contact pin 49a side, so the interlocking mechanism 29 does not work. Only the front lock release lever 29A is locked.

Next, the control unit will be described with reference to FIGS. FIG. 7 is a front view of the main part showing the configuration of the unlocking device, and FIGS. 8A and 8B are diagrams showing the operating state and the non-operating state of the cam member. The control unit includes a push operation type emergency operation switch 57 for performing the emergency operation, which is arranged in the vicinity of the hand operation switch 56, and the holding rail 14 and the feed according to the operation of the emergency operation switch 57. A lock releasing device 58 for releasing the pinching with the chain 12 and a rotation stopping means 59 for stopping the driving of the handling cylinder 9 and the feed chain 12 are provided.

The emergency operation switch 57 is arranged at the front part of the outer side surface of the threshing device so that it can be pushed and operated by a worker who is performing a manual operation. The emergency operation switch 57 may be of a momentary type or an alternation type, and the type of switch is not limited, and the pressing operation of the arbitrary emergency operation switch 57 performs the emergency operation.

The rotation stopping means 59 includes an engine stopping means such as a fuel cut solenoid for stopping the engine, and the above-mentioned braking mechanism for applying a braking force to the handle cylinder 9.

As shown in FIGS. 7 and 8, the unlocking device includes a cam member 61 that acts on the unlocking lever 28A side and a contact member that is provided in the middle of the front unlocking lever 28A and contacts the cam member 61. The pin 62, a drive motor 63 that is an actuator that drives the cam member 61, and a position detection sensor 64 that detects the rotational position of the cam member 61.

The cam member 61 is arranged below the front lock release lever 28A together with the drive motor 63. Further, the cam member 61 is formed in an oval shape, and the peripheral edge is close to the rotation shaft side and does not act on the contact pin 62 on the front lock release lever side. The contact pin 62 of the lever 28A is formed with an action portion 61a that acts from below.

As a result, the cam member 61 is rotationally driven by the drive motor 63, the acting portion 61a of the cam member 61 comes into contact with the contact pin 62, and as the rotation further proceeds, the front lock release lever 28A gradually moves upward ( It is configured to be pushed up to the unlocked side) (operating state). At this time, if the cam member 61 makes one rotation, the unlocking operation is also completed.

According to this configuration, since the front lock release lever 28A is operated via the cam member 61 rotated by the drive motor 63, compared to the case where the lock release lever is directly operated by the drive motor 63 or the like, the drive motor (actuator) is operated. ) Can be prevented from being overloaded.

Further, when the non-acting portion 61b faces the upper side and is located in a state where the non-acting portion 61b does not act on the front lock release lever 28A (abutting portion 30) (non-acting state), the cam member 61 is locked in front. The cam member 61 does not interfere with the front lock release lever 28A side even when the release lever 28A is manually rocked up and down to the lock position and the lock release position (see FIG. 8A).

The position detection sensor 64 is a contact sensor installed on the lower side of the cam member 61, and a contact piece 66 that comes into contact with the position detection sensor 64 is provided on the acting portion 61a side of the cam member 61. .. Accordingly, the control unit 60 can detect that the acting portion 61a of the cam member 61 is located on the lower side of the shaft, that is, the cam member 61 is in the non-acting state (FIG. 8(A)). reference).

According to this configuration, when the lock release device 58 performs the lock release operation on the front lock release lever, the cam member 61 changes from the non-acting state to the working state and returns to the non-working state (the cam member 61 makes one rotation. This can be detected by providing only one switch of the position detection sensor 64, so that the cost can be kept low and the structure can be made compact.

Incidentally, in the front lock release lever 29A, the interlocking mechanism 29 is arranged between the grip portion 34 of the front lock release lever 28 and the swing fulcrum 35 in a front view, and the front lock release lever 28A moves from the lock side to the lock release side. The interlocking mechanism 29 is arranged so as to approach the rocking fulcrum 35 side of the front lock release lever 28A when the rocking operation is performed.

Specifically, the contact portion 30 of the front lock release lever 28A is provided on the upper side where the lever middle portion is bent downward in a dogleg shape, and the front lock release lever 28A is unlocked from the lock position. When the contact pin 49a is swung upward to the position, the contact pin 49a is configured to slide (approach) from the grip portion 34 side of the contact portion 30 to the fulcrum portion 35 side (FIGS. 8A and 8B). reference).

With this configuration, when the lock release device 58 unlocks the front lock release lever 28A and the rear lock release lever 29B simultaneously releases the lock via the interlocking mechanism 29, the front lock release lever 28A is unlocked. It is possible to prevent the operation load required for operation from increasing. Therefore, it is possible to prevent the drive motor 63 from being unnecessarily loaded, and it is possible to more smoothly operate the front lock release lever 28A to unlock the front and rear lock devices 26A and 26B.

Further, since the front lock release lever 28A is disposed so as to be vertically sandwiched between the interlocking mechanism 29 and the lock release device 58 (cam member 61) in a front view, the overall configuration can be made compact.

From the above, when the operator's pressing operation of the emergency operation switch 57 is detected, the control unit 60 drives the cam member 61, whose rotational position is detected by the position detection sensor 64 by the drive motor 63, to rotate once. Thus, the front lock release lever 28A is configured to be unlocked.

As a result, the cylinder cover 13 is unlocked by the front and rear locking devices 26 via the interlocking mechanism 29 to open upward, and the clamping between the clamping rail 14 and the feed chain 12 is smoothly released. It At this time, the rotation stopping means 59 quickly stops the driving of the handling cylinder 9 and the feed chain 12, so that the safety is further improved.

9 Handling cylinder 11 Handling room 12 Feed chain 13 Cylinder cover (cover body)
14 Clamping lane (clamping body)
26 Lock Device 28 Lock Release Lever 29 Interlocking Mechanism 33 Link Mechanism (Linking Mechanism)
58 unlocking device 63 drive motor (actuator)
61 cam member 61a acting portion 61b non-acting portion

Claims (4)

A handling barrel (9) for performing threshing treatment of grain culms by rotationally driving in the handling room (11),
A cover body (13) for opening and closing the handling room (11),
A feed chain (12) which is arranged on the side of the handling barrel (9) and conveys the grain culms with the tips facing the handling barrel (9) side;
A sandwiching body (14) which is provided on the cover body (13) side and sandwiches the stock root side of the grain stem being conveyed together with the feed chain (12) when the cover body (13) is in a closed state,
A lock member (31) for locking the cover body (13) in a closed state,
A manually operated lock release lever (28),
A linkage mechanism (33) for mechanically linking the lock release lever (28) and the lock member (31) so that the lock by the lock member (31) is released by the rocking operation of the lock release lever (28). )When,
A lock release device (58) for swinging the lock release lever (28) to a lock release side, which is a side where the lock is released,
The unlocking device (58) includes a cam member (61) for swinging the unlocking lever (28) toward an unlocking side, and an actuator (63) for rotationally driving the cam member (61) only in one direction. If, possess a position detection sensor (64) for detecting the rotational position of the cam member (61), an operation switch (57), and a control unit,
During rotation of the cam member (61), the peripheral edge of the cam member (61) acts on the lock release lever (28) side to swing the lock release lever (28) toward the lock release side. And a non-acting portion (61b) that does not act on the lock release lever (28) side is formed.
The position detection sensor (64) is configured to detect a non-acting state in which the cam member (61) does not act on the lock release lever (28),
The control unit sets the non-acting state of the cam member (61) as an initial position, and when the pressing operation of the operation switch (57) is detected, the control unit drives the cam member (61) to rotate. A threshing device configured to unlock the cover body (13) and thereafter stop driving the cam member (61) in a non-acting state . The position detection sensor (64) is Installation to at least partially wrap position and rotation trajectory of the cam member (61),
The threshing device according to claim 1, wherein the cam member (61) is provided with a contact piece 66 that comes into contact with the position detection sensor (64) within a rotation trajectory of the cam member (61). The lock release lever (28) and the lock device (26) are provided in a front-rear pair, and a front-rear direction interlocking mechanism (29) that links the front and rear lock release levers (28) is provided. The threshing device according to claim 1, wherein the threshing device is arranged so as to be vertically sandwiched by the interlocking mechanism (29) and the cam member (61). The threshing device according to claim 3, wherein the lock release lever (28) is configured such that the interlocking mechanism (29) approaches the rotation fulcrum side of the lock release lever (28) with the lock release operation.

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