JP2021101675A - Combine harvester - Google Patents

Abstract

To immediately separate a nipping rail from a feed chain.SOLUTION: A combine harvester includes: a nipping transport device 13 including a feed chain 11 and a nipping rail 12, and nipping and transporting reaped grain culm; and a threshing device 5 for threshing the reaped grain culm which is transported by the nipping transport device 13. The nipping rail 12 is supported by the threshing device 5 so as to be capable of being vertically lifted while being in a nipping action state and a separated state in which the nipping rail is separated upward from the feed chain 11. The combine harvester includes: front and rear lock mechanisms 33 provided in front and rear both side parts of the threshing device 5 and capable of switching between a lock state of holding a position of the nipping rail 12 while the nipping rail is in the nipping action state and a release state of releasing the nipping rail from the holding position; and a linkage mechanism 40 capable of switching the front and rear lock mechanisms 33 to the release state from the lock state with the operation of an actuator 42.SELECTED DRAWING: Figure 3

Description

The present invention is configured to handle and process the tip of the harvested culm with a handling cylinder inside the threshing device while sandwiching and transporting the harvested culm by a sandwiching and transporting device having a feed chain and a sandwiching rail. Regarding the combine harvester.

Conventionally, the upper part (upper structure) of the threshing device that supports the handling cylinder and the holding rail is supported so as to be swingable up and down with respect to the lower part, and the upper part is swung upward to swing the holding rail and the feed. There was something that made it possible to remove the clogging rails between the chains. Then, lock mechanisms for holding the upper portion of the threshing device in the used state are provided on both front and rear portions of the threshing device, and the front and rear lock mechanisms are configured to release the position holding state separately by manual operation ( For example, see Patent Document 1).

JP-A-2007-30771

Smooth transport may not be possible due to clogging of the grain culm during transport by the pinch transport device or pinching of other objects. In such a case, it is necessary to separate the holding rail from the feed chain to remove the clogged culm and other objects.

In the above-mentioned conventional configuration, even when it is necessary to separate the holding rail from the feed chain, it is necessary to manually release the front and rear lock mechanisms separately, which is troublesome and quick. There was a risk that it could not be dealt with.

Therefore, it has been desired to be able to quickly separate the holding rail from the feed chain.

The characteristic configuration of the combine according to the present invention is a cutting section for cutting the planted culm, a feed chain, and a holding rail which is arranged above the feed chain and holds the cut culm in cooperation with the feed chain. It is provided with a sandwiching transport device for sandwiching and transporting the harvested culm, and a threshing device for threshing the harvested culm by inserting the tip of the planted culm transported by the sandwiching and transporting device. The holding rail is supported by the threshing device so as to be able to move up and down over a holding action state facing the feed chain and a separated state separated upward from the feed chain, and is provided on both front and rear portions of the threshing device. It has a front and rear lock mechanism that can switch between a locked state in which the holding rail is held in the holding action state and a release state in which the holding of the holding rail is released, and an actuator. A linking mechanism capable of switching the front and rear lock mechanisms from the locked state to the released state is provided.

According to the present invention, when the actuator is activated, both the front and rear locking mechanisms are switched from the locked state to the released state. When the lock is released, the position holding of the holding rail is released, so that the holding rail can be separated from the feed chain. The front and rear lock mechanisms provided apart from each other in the front and rear can be unlocked at the same timing by the operation of the actuator, and the holding rail can be lifted satisfactorily.

The condition for operating the actuator can be set when it is necessary to separate the holding rail from the feed chain. For example, it is possible to target that a manual switch for emergency stop is operated, or that an abnormality detecting means provided in each part of the machine body detects an abnormality. Even when it is necessary to hurry to separate the holding rail from the feed chain in this way, the lock can be released quickly without the hassle of manually unlocking the front and rear lock mechanisms separately. ..

Therefore, it has become possible to quickly perform the process of separating the holding rail from the feed chain.

In the present invention, an urging means for lifting and urging the pinching rail from the pinching action state toward the separated state is provided, and the front and rear locking mechanisms use the pinching rail as the urging force of the urging means. It is preferable to hold the position in the pinching action state.

According to this configuration, when the front and rear lock mechanisms are switched to the released state, the holding rail immediately moves upward by the urging force of the urging means. As a result, after the front and rear lock mechanisms are switched to the released state, the holding rail can be automatically switched from the holding action state to the separated state, and there is no need to manually lift the holding rail, which is not troublesome.

In the present invention, the linking mechanism activates the actuator after a predetermined time has elapsed after switching the front and rear locking mechanisms from the locked state to the released state, and the front and rear lock mechanisms are moved from the released state to the unlocked state. It is preferable to switch to the locked state.

When the coupling mechanism switches the front and rear lock mechanisms to the released state and then the actuator maintains that state, the holding rail is returned to the holding action state after removing what is sandwiched between the holding rail and the feed chain. Even so, the front and rear locking mechanisms cannot be returned to the locked state.

Therefore, according to this configuration, after a predetermined time has elapsed after switching to the released state, the actuator is operated to switch the front and rear lock mechanisms from the released state to the locked state, so that the holding rail is put into the holding action state. It can be returned and the threshing work can be continued.

In the present invention, it is preferable that the holding rail moves up and down by swinging around an axis along the front-rear direction.

According to this configuration, for example, the holding rail can be supported up and down with a simple support structure as compared with the structure in which the holding rail is slidably supported in the vertical direction.

In the present invention, it is preferable that the linking mechanism is provided with a gear meshing type link mechanism having a plurality of gears and a motor as the actuator for rotationally driving any one of the plurality of gears. Is.

According to this configuration, since the link mechanism is a gear meshing type, the rotational power of the motor can be transmitted to the lock mechanism to ensure the switching operation without slipping or the like. In addition, the link mechanism can increase the torque of the rotational power of the motor by decelerating with gears, which can be handled by a small motor, and compared to the case of using a complicated configuration such as a push-pull link or a universal joint. It can be stored in a compact shape.

In the present invention, the link mechanism has a front-rear symmetrical shape between the link on the front side of the front-rear direction central portion and the link on the rear side of the front-rear direction center portion in the installation range extending over the front and rear lock mechanisms. It is preferable that the motor is provided so as to act on the central portion in the front-rear direction of the link mechanism.

According to this configuration, the power of the motor can be efficiently transmitted to each of the front link and the rear link, and the front link and the rear link having a symmetrical shape are operated in the same direction. The left and right lock mechanisms can be operated in the same way.

In the present invention, it is preferable that the plurality of gears are rotatably supported by a lateral support shaft and are provided in a state of being meshed with each other in the front-rear direction.

According to this configuration, since the plurality of gears are arranged in a state of being narrowed along the lateral direction, the link mechanism can be accommodated in a compact shape along the lateral direction.

In the present invention, it is preferable that an exterior cover is provided on the lateral outer side of the threshing device, and the linking mechanism is arranged between the exterior cover and the side wall of the threshing device.

According to this configuration, the linkage mechanism can be arranged compactly without protruding to the outside of the machine body by effectively utilizing the empty space.

It is a side view of a combine. It is a longitudinal side view of the threshing device. It is a vertical sectional rear view of a threshing device. It is a side view which shows the linkage mechanism. It is a top view which shows the linkage mechanism. It is an exploded perspective view which shows the linkage mechanism. It is a front view which shows the linkage mechanism. It is a control block diagram. It is a flowchart of a control operation. It is a front view which shows the linkage mechanism of another embodiment.

Embodiments of the present invention will be described with reference to the drawings. In the following description, the direction of the arrow "F" is the front side, the direction of the arrow "B" is the rear side, the direction of the arrow "L" is the left side, the direction of the arrow "R" is the right side, and the direction of the arrow "U". Is on the upper side, and the direction of the arrow "D" is on the lower side.

〔overall structure〕
As shown in FIG. 1, the combine according to the present invention is provided with a cutting section 3 for cutting planted grain culms at the front portion of a traveling machine 2 that is self-propelled by a pair of left and right crawler traveling devices 1 and 1. A driving unit 4 is provided on the right side of the front portion of the traveling machine body 2. Behind the driving unit 4, a threshing device 5 for threshing the grain culms cut by the cutting unit 3 and a grain tank 6 for storing the grains obtained by the threshing process are arranged in the horizontal direction. Deployed in state.

The harvesting unit 3 includes a weeding tool 7 that guides the root of the planted culm to be harvested, a plurality of raising devices 8 that cause the planted culm to be harvested in a vertical position, and a raised planting. A varican-type cutting device 9 that cuts the root of the standing grain culm, and a transport device 10 that transports the cut grain culm backward while changing the posture so as to gradually change from the vertical position to the sideways position and supplies it to the grain removal device 5. Etc. are provided.

On the left side of the threshing device 5, there is a feed chain 11 and a holding rail 12 which is arranged on the upper side of the feed chain 11 and holds a planted grain culm in cooperation with the feed chain 11, and holds a harvested grain culm. A pinch transport device 13 for pinch transport is provided. Behind the threshing device 5, a straw cutter 14 for cutting the straw sent out from the threshing device 5 is provided. The grain tank 6 is provided with a grain discharge device 15 for discharging the grains stored in the grain tank 6 to the outside of the machine.

[Threshing device]
In the threshing device 5, the tip portion of the planted culm transported by the sandwiching and transporting device 13 is thrown into the handling chamber 16 to thresh the harvested culm. As shown in FIG. 2, the handling chamber 16 is provided with a handling cylinder 17. The handling cylinder 17 is rotatable around a rotation shaft core X1 extending in the front-rear direction of the machine body. Below the handling cylinder 17, a receiving net 18 for leaking the processed material that has been threshed by the handling cylinder 17 is provided. A dust exhaust fan 19 for discharging dust to the outside is provided behind the handling chamber 16.

At the lower part of the threshing device 5, the threshed product leaked from the receiving net 18 is mixed with single-grained grains as the first product, grains with branch stalks as the second product, and waste straw waste. Etc., a sorting unit 20 for sorting is provided. The sorting unit 20 includes a rocking sorting device 21 that sifts and sorts objects to be sorted while transferring them to the rear of the machine, a wall insert 22 that blows sorting air to the rocking sorting device 21, and a first collecting unit 23 that collects the first thing. A second collection unit 24 or the like for collecting the second item is provided.

As shown in FIG. 3, the threshing case 25 surrounding the handling chamber is an upper case that rotatably supports the handling cylinder 17 around the front-rear axis X1 and supports the holding rail 12 via the rail support base 26. It is composed of 27 and a lower case 28 that supports a receiving net 18, a swing sorting device 21, and the like.

As shown in FIGS. 2 and 3, the upper case 27 has a front side plate 27a arranged on the front side of the handling cylinder 17, a rear side plate 27b arranged on the rear side of the handling cylinder 17, and the handling cylinder 17. A top plate 27c arranged so as to extend over the front side plate 27a and the rear side plate 27b is formed so as to cover the handling cylinder 17 from above. The top plate 27c is provided in a substantially mountain shape when viewed in the front-rear direction, and is located in the center of the left and right sides and is located on the left side of the upper flat surface 27c1 in the horizontal posture and the upper flat surface 27c1 and is located on the left side of the upper flat surface 27c1. An example of a side wall), which is located on the right side of the upper flat surface 27c1 and has a right inclined surface 27c3 in a downward downward inclined posture.

The upper case 27 is supported with respect to the lower case 28 so as to be vertically swingable around the front-rear axis X2. The upper case 27 is configured to be able to move up and down between a closed state shown by a solid line in FIG. 3 and an open state in which the handling chamber 16 is opened by moving upward as shown by a virtual line in FIG.

The holding rail 12 is supported by a rail support base 26 which is fixedly supported by the upper case 27. Therefore, the holding rail 12 is integrally supported with the upper case 27 so as to be vertically swingable around the front-rear shaft core X2. The holding rail 12 is connected to the lower end of the support rod 29 which is slidably supported in the vertical direction with respect to the rail support base 26. The holding rail 12 is moved and urged downward by the compression spring 30 extrapolated to the support rod 29. The support rod 29 is prevented from moving further downward at a position where the holding rail 12 is close to the feed chain 11 and can hold the cut grain culm. Although not described in detail because it is a well-known configuration, the sandwiching rail 12 is divided into a plurality of parts along the transport direction, and the plurality of divided bodies are pivotally connected so as to be bendable. A support rod 29 is provided.

Since the holding rail 12 is integrally supported with the upper case 27 so as to swing up and down around the front-rear shaft core X2, the closed state of the upper case 27 is a holding action state in which the holding rail 12 faces the feed chain 11. The open state of the upper case 27 corresponds to the separated state in which the holding rail 12 is separated upward from the feed chain 11.

An exterior cover 31 that covers the upper part of the upper case 27 and the outside on the right lateral side is provided. The exterior cover 31 is provided wide in the left-right direction over the entire width of the threshing device 5, and is provided wide in the front-rear direction from the front end of the threshing device 5 to the front end of the straw cutter 14. There is. Although the support structure is not shown, the exterior cover 31 is integrally supported with the upper case 27 so as to be vertically swingable around the front-rear shaft core X2. On the outside of the left side surface of the exterior cover 31, an operating tool 32 (see FIG. 1) that can be gripped is provided.

(Lock mechanism)
As shown in FIG. 3, locks for holding the upper case 27 in a closed state on both front and rear portions of the threshing device 5, specifically, the front side portion of the front side plate 27a and the rear side portion of the rear side plate 27b, respectively. A lock mechanism 33 that can be switched between a state and a release state for releasing the closed state of the upper case 27 is provided. When the lock mechanism 33 is switched to the locked state, the pinching rail 12 is held in the pinching action state. When the lock mechanism 33 is switched to the released state, the position holding of the holding rail 12 is released.

The lock mechanism 33 has a locking pin 35 fixed to the lower case 28 in a front-rear posture via a connecting plate 34 for reinforcement, and a hook portion 36 that can be locked to the locking pin 35, and the upper case 27. A locking member 37 that is supported so as to swing up and down around the front-rear shaft core X3, and a return spring 38 that urges the locking member 37 in a direction in which the hook portion 36 and the locking pin 35 engage with each other. I have. The locking member 37 extends along the left-right direction from a position corresponding to the locking pin 35 to a position protruding outward on the left side of the exterior cover 31, and swings to the upper case 27 in the middle of the left and right. It is supported as much as possible.

By raising the left end of the front and rear locking members 37, the locking in the closed posture due to the engagement between the locking pin 35 and the hook portion 36 can be released. Then, the upper case 27 is switched from the open posture to the closed posture by operating the operating tool 32 to lower the upper case 27, and the upper case 27 is moved by the engagement between the locking pin 35 and the hook portion 36. It can be held in a closed position.

A telescopic gas spring 39 is provided in the vicinity of the portion of the lower case 28 where the lock mechanism 33 is provided and the upper right portion of the upper case 27. The position of the gas spring 39 can be held in a state where the upper case 27 is switched to the open posture. When the upper case 27 is switched to the closed posture, the gas spring 39 is compressed, and the upper case 27 is oscillated upward. Therefore, the gas spring 39 corresponds to the urging means. The urging force of the gas spring 39 can assist when manually raising the upper case 27.

By raising the locking member 37 against the urging of the return spring 38, the lock can be released in the closed posture by engaging the locking pin 35 and the hook portion 36, and the gas spring 39 is attached due to the release. Depending on the force, the upper case 27 can be switched from the closed posture to the open posture.

Further, the upper case 27 is switched from the open posture to the closed posture by the lowering operation of the upper case 27 against the urging of the gas spring 39, and the upper case 27 is engaged with the locking pin 35 and the hook portion 36. Can be held in a closed position.

[Coordination mechanism]
A linking mechanism 40 capable of switching the front and rear lock mechanisms 33 from the locked state to the released state is provided. As shown in FIG. 3, the linking mechanism 40 is arranged between the outer cover 31 and the left inclined surface 27c2 of the upper case 27.

As shown in FIGS. 4 to 7, the linkage mechanism 40 includes a gear meshing type link mechanism 41 having a plurality of gears and an electric motor 42 as an actuator for rotationally driving one of the plurality of gears. It is equipped.

As shown in FIGS. 4 and 6, the link mechanism 41 includes a link 43 on the front side of the front-rear direction central portion and a link 44 on the rear side of the front-rear direction central portion in the installation range over the front-rear lock mechanism 33. It is provided in a symmetrical shape. The electric motor 42 is provided so as to act on the central portion of the link mechanism 41 in the front-rear direction. The plurality of gears are rotatably supported by a lateral support shaft and are provided so as to mesh with each other in the front-rear direction.

To add an explanation, in the front link 43, the first link body 45 located on the front side and the second link body 47 having the fan-shaped gear portion 46 located on the rear side are integrally connected. .. The link 43 on the front side is supported by the upper case 27 so that the connecting portion between the first link body 45 and the second link body 47 can be swung around the left-right axis Y1 by the support shaft 48.

In the rear link 44, the first link body 49 located on the rear side and the second link body 51 having the fan-shaped gear portion 50 located on the front side are integrally connected. The link 44 on the rear side is supported by the upper case 27 so that the connecting portion between the first link body 49 and the second link body 51 can swing around the horizontal shaft core Y2 by the lateral support shaft 52.

In this way, the front link 43 and the rear link 44 are in positions where the first link bodies 45, 49 and the second link bodies 47, 51 having the same configuration are inverted in the front-rear direction, and have a front-rear symmetrical shape. It is provided in.

An electric motor 42 with a reduction mechanism, a drive gear 55, and a relay gear 56 are provided at an intermediate position between the front and rear links 43 and the rear link 44 while being supported by the upper case 27 via a bracket 53. Has been done. In the electric motor 42, the motor body 42a and the deceleration case 42b are integrally connected and supported by the bracket 53. A drive gear 55 is provided on the lateral output shaft 42c of the electric motor 42. The front side of the drive gear 55 meshes with the fan-shaped gear portion 46 of the second link body 47 in the front link 43. The rear side of the drive gear 55 meshes with the front side of the relay gear 56.

The relay gear 56 is rotatably supported around the horizontal axis Y3 by a lateral support shaft 57. The front side of the relay gear 56 meshes with the drive gear 55. The rear side of the relay gear 56 meshes with the fan-shaped gear 50 portion of the second link body 51 in the rear link 44.

In this way, the plurality of gears (drive gear 55, relay gear 56, fan-shaped gear portions 46, 50 of the second link bodies 47, 51 on both front and rear sides) are formed by lateral support shafts (54c, 57, 48, 52). It is rotatably supported and is provided in a state of meshing along the front-rear direction.

A contact roller 58 is rotatably supported around the horizontal axis at the front end of the first link body 45 on the front side and the rear end of the first link body 49 on the rear side, respectively. The front and rear contact rollers 58 are provided so as to contact the pressing member 59 provided at an intermediate position on the front side of the locking member 37 from below. The pressing member 59 is formed in an L shape in a side view, a vertical surface portion is integrally connected to the locking member 37, and an upper surface portion is provided so as to project inward in the front-rear direction.

A potentiometer-type operation amount detector 60 for detecting the operation amount of the link mechanism 41 is provided. The operating amount detector 60 includes a detector main body 60a supported by the upper case 27 and a detection arm 60b oscillatingly supported by the detector main body 60a around the horizontal axis. A locking pin 60c that abuts on the upper edge of the first link body 45 is provided at the tip of the detection arm 60b. The detector body 60a is equipped with a potentiometer for detecting the amount of swing of the detection arm 60b.

When the electric motor 42 rotates and the drive gear 55 rotates counterclockwise from the standby state shown in FIG. 4, the front and rear links 43 and 44 swing accordingly, and the front and rear contact rollers 58 move. The locking member 37 is pushed up to release the lock in the closed posture by engaging the locking pin 35 and the hook portion 36.

When the lock is released by the operation of the electric motor 42, the upper case 27 rises and swings due to the urging force of the gas spring 39, and the holding rail 12 is separated from the feed chain 11.

[Emergency stop configuration]
As shown in FIG. 1, a stop switch 61 that can be pushed and operated from the outside of the machine body is provided at a front end side portion on the left side surface of the exterior cover 31. The stop switch 61 is used when a worker working outside the machine body urgently stops the operation. For example, there is a case where it is desired to stop the feed chain 11 urgently for some reason while performing the manual handling work of manually feeding the cut grain culm into the feed chain 11.

When the stop switch 61 is operated, the operation of the engine E mounted on the airframe is automatically stopped, and the electric motor 42 is operated to separate the holding rail 12 from the feed chain 11. There is.

As shown in FIG. 8, a fuel shutoff device 62 that shuts off the fuel supply to the engine E, a rotation speed sensor 63 that detects the output rotation speed of the engine E, and a control that controls the operation of the fuel shutoff device 62 and the electric motor 42. A device 64 is provided. Information on the stop switch 61 and the operation amount detector 60 is also input to the control device 64.

As shown in FIG. 9, when the stop switch 61 is operated, the control device 64 operates the fuel shutoff device 62 to stop the fuel supply to the engine E (steps 1 and 2). When it is detected that the engine speed has dropped to the set value or less (step 3), the unlocking operation by the electric motor 42 is executed (step 4). That is, when the electric motor 42 is rotated in the release direction and the operation amount detector 60 detects that the link mechanism 41 has swung to a position corresponding to the unlocking, the electric motor 42 rotates at that position. To stop.

When the set time or more has elapsed after the unlocking operation is executed, the motor return process of rotating the electric motor 42 in the opposite direction to return the link mechanism 41 to the standby state is executed (steps 5 and 6). After that, when the upper case 27 is lowered, the locking pin 35 and the hook portion 36 of the locking member 37 are engaged with each other, and the locking mechanism 33 is switched to the locked state.

[Another Embodiment]
(1) In the above embodiment, the electric motor 42 is provided in a state of being located on the lateral outer side (exterior cover 31 side) with respect to the bracket 53. As shown, the electric motor 42 may be provided on the lateral inner side (opposite side of the exterior cover) with respect to the bracket 53. With this configuration, the linkage mechanism 40 can be housed in a more compact shape in the left-right direction.

(2) In the above embodiment, the link mechanism 41 is provided with the front link 43 and the rear link 44 in a front-rear symmetrical shape, and the electric motor 42 acts on the central portion in the front-rear direction. Instead of this configuration, the electric motor 42 is provided on one side in the front-rear direction in the installation range extending over the front-rear lock mechanism 33, and the power of the electric motor 42 is transmitted to the front-rear lock mechanism 33 on both sides. May be good.

(3) In the above embodiment, the electric motor 42 is provided as the actuator, but a hydraulic motor may be used instead of the electric motor 42, and the actuator is not limited to the motor, but may be a hydraulic cylinder, an electric cylinder, or the like. Good. Further, the actuator is not limited to one, and a plurality of actuators may be used to unlock the front and rear lock mechanisms 41 at the same timing.

(4) In the above embodiment, a plurality of gears in the link mechanism 41 are rotatably supported by a lateral support shaft and are provided in a state of being meshed with each other in the front-rear direction. , The gear may be supported by a support shaft in the front-rear direction, or may be provided in a state where the gear is engaged in the vertical direction or the horizontal direction.

(5) In the above embodiment, the link mechanism 41 is configured in a gear meshing type, but instead of this configuration, a configuration using an endless rotating body such as a belt or a chain, or a push-pull link or a universal joint is used. It may be the configuration to be used.

(6) In the above embodiment, the gas spring 39 is provided as an urging means for lifting and urging the holding rail 12, but instead of this configuration, a spring such as a coil spring or a leaf spring is used as the urging means. You may use it.

(7) In the above embodiment, the holding rail 12 is configured to swing up and down integrally with the upper case 27, but instead of this configuration, the holding rail 12 swings up and down independently with respect to the upper case 27. It may be configured to be movably supported.

(8) In the above embodiment, the holding rail 12 swings around the axis along the front-rear direction to move up and down, but instead of this configuration, the holding rail 12 slides linearly in the vertical direction. It may be configured to move up and down.

The present invention can be applied to a combine that is configured to handle and process the harvested culms while sandwiching and transporting the harvested culms by a sandwiching and transporting device having a feed chain and a sandwiching rail.

3 Cutting part 5 Threshing device 11 Feed chain 12 Holding rail 13 Holding transfer device 27c2 Side wall 31 Exterior cover 33 Lock mechanism 39 Gas spring (Aggression means)
40 Linkage mechanism 41 Link mechanism 42 Electric motor (actuator)
43 Front link 44 Rear link

Claims (8)

The cutting department that cuts the planted culm and
A feed chain and a pinching and transporting device which is arranged above the feed chain and has a pinching rail for sandwiching and transporting the harvested culms in cooperation with the feed chain, and sandwiching and transporting the harvested culms.
A threshing device is provided, in which the tip portion of the harvested culm transported by the sandwiching and transporting device is thrown in and the harvested culm is threshed.
The holding rail is supported by the threshing device so as to be able to move up and down in a holding action state facing the feed chain and a separated state separated upward from the feed chain.
The front and rear locking mechanisms and actuators provided on both front and rear sides of the threshing device and capable of switching between a locked state in which the pinching rail is held in the pinching action state and a release state in which the pinching rail is released from the position holding are provided. A combine having a linking mechanism capable of switching the front and rear locking mechanisms from the locked state to the released state by the operation of the actuator. An urging means for lifting and urging the pinching rail from the pinching action state toward the separated state is provided.
The combine according to claim 1, wherein the front and rear locking mechanisms hold the holding rail in the holding action state against the urging force of the urging means. The linking mechanism is claimed to operate the actuator to switch the front and rear lock mechanisms from the unlocked state to the locked state after a predetermined time has elapsed after switching the front and rear lock mechanisms from the locked state to the released state. Item 2. The combine according to item 1 or 2. The combine according to any one of claims 1 to 3, wherein the holding rail moves up and down by swinging around an axis along the front-rear direction. Any of claims 1 to 4, wherein the linking mechanism includes a gear meshing type link mechanism having a plurality of gears and a motor as an actuator for rotationally driving any of the plurality of gears. The combine described in item 1. The link mechanism is provided in a state in which the link on the front side of the central portion in the front-rear direction and the link on the rear side of the central portion in the front-rear direction of the installation range extending over the front and rear lock mechanisms have a front-rear symmetrical shape.
The combine according to claim 5, wherein the motor is provided so as to act on a central portion in the front-rear direction of the link mechanism. The combine according to claim 5 or 6, wherein the plurality of gears are rotatably supported by a lateral support shaft and are provided in a state of being meshed with each other in the front-rear direction. An exterior cover is provided on the lateral outer side of the threshing device.
The combine according to any one of claims 1 to 7, wherein the linking mechanism is arranged between the exterior cover and the side wall of the threshing device.

Images