CN106134627B

CN106134627B - Combine harvester

Info

Publication number: CN106134627B
Application number: CN201510131989.4A
Authority: CN
Inventors: 田部彩; 平田晋; 高木雅志; 铃木祥宏; 西野光雄; 永田哲治; 光原昌希; 村山贤多
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2014-09-11
Filing date: 2015-03-25
Publication date: 2020-02-14
Anticipated expiration: 2035-03-25
Also published as: KR20160030827A; CN106134627A; KR102406944B1

Abstract

The invention provides a combine harvester, which is easy to confirm the closing posture of a guide rail even if a structure capable of changing the posture between the closing posture and the opening posture relative to a conveying chain is adopted. The combine harvester comprises: a conveying chain (7) which is driven by the rotating power of the engine (E) and conveys the grain and straw harvested by the harvesting part (1) to the threshing device (4); a guide rail mechanism (27) having a guide rail that can be changed between a closed position in which the guide rail is close to the conveyor chain (7) and guides the grain and straw conveyed by the conveyor chain (7) from above, and an open position in which the guide rail is spaced upward from the conveyor chain (7); a rail posture detection unit (260) that detects the open posture of the rail mechanism (27); and an engine drive management unit (220) that prohibits the drive of the engine (E) on the condition that the open posture is detected by the rail posture detection unit (260).

Description

Combine harvester

Technical Field

The invention relates to a combine harvester, comprising: the harvester comprises an engine, a harvesting part driven by the power of the engine, a conveying chain and a threshing device.

The invention relates to a combine harvester, which comprises an engine, a harvesting part driven by the power of the engine, a conveying chain and a threshing device.

Background

As such a combine harvester, for example, a combine harvester described in patent document 1 is known. The combine harvester described in patent document 1 includes a guide rail that grips a harvested straw together with a conveyor chain at a position vertically opposite to the conveyor chain. In such a combine harvester, in order to facilitate maintenance of the threshing opening, it is necessary to separate the guide rail from the conveyor chain. However, since the threshing opening is widely opened, when the posture of the guide rail is configured to be changeable between the closed posture and the open posture, it is necessary to confirm that the guide rail is reliably in the closed posture at the end of maintenance or the like.

The combine harvester of patent document 2 is provided with a conveyor chain clutch that can be switched between a transmission state in which power is transmitted to the conveyor chain and a disconnection state in which power transmitted to the conveyor chain is disconnected. The conveyor chain clutch employs a cam-drive clutch operating device for performing an on/off operation. The clutch operating device includes a driving device for generating a driving force and a cam mechanism driven by the driving device, and the driving device drives the cam mechanism to switch the conveyor chain clutch to the cut-off state. In order to more quickly switch the conveyor chain clutch to the disengaged state, it is necessary to quickly displace the cam mechanism (cam plate) to a predetermined position. For this reason, an electric motor is used as the displacement driving force.

In addition, in the combine harvester of patent document 3, it is important to ensure reliability of the drive control. The combine harvester includes a guide rail for holding a harvested straw together with a conveyor chain at a position opposite to the conveyor chain in the up-down direction. In this way, in a combine harvester in which a grain and straw conveying device for conveying grain and straw to a threshing device is configured by a conveying chain and a guide rail, in order to facilitate maintenance of a threshing opening region where openings of the conveying chain and the guide rail are located, it is necessary to detach the guide rail from the conveying chain. In the case where the posture of the guide rail with respect to the conveyor chain is configured to be changeable between the closed posture and the open posture, the electric motor is suitable for the driving source for quickly changing the posture, but the reliability of the driving control is important.

Patent document 1: japanese patent laid-open publication No. 2012 and 191942

Patent document 2: japanese patent application laid-open No. 2010-166866

Patent document 3: japanese patent laid-open publication No. 2012 and 191942

Disclosure of Invention

In view of the above circumstances, it is highly desirable to easily confirm the closed posture of the guide rail even if a structure capable of changing the posture between the closed posture and the open posture with respect to the conveyor chain is adopted.

The combine of the invention includes the engine, reaping part, thresher driven by the rotary power of the said engine, the combine of the invention includes: a conveying chain driven by the rotational power of the engine and conveying the grain stalks harvested by the harvesting unit to the threshing device; a guide rail mechanism having a guide rail capable of changing a posture between a closed posture in which the guide rail is close to the conveyor chain so as to guide the grain or straw conveyed by the conveyor chain from above and an open posture in which the guide rail is spaced upward from the conveyor chain; a rail posture detecting unit that detects an open posture of the rail mechanism; and an engine drive management unit that prohibits driving of the engine on the condition that the open posture is detected by the guide rail posture detection unit.

According to this configuration, if the guide rail mechanism is in the open posture, the open posture of the guide rail mechanism can be detected by the guide rail posture detecting unit, and the driving of the engine can be prohibited using the detection of the open posture as a trigger. Therefore, the engine can be driven with the guide rail mechanism in the open position, and as a result, driving of the threshing device, the conveyor chain, and the like can be avoided.

In a preferred embodiment of the present invention, the combine harvester further includes a clutch that turns on and off power from the engine to the threshing device, and the engine drive management unit prohibits driving of the engine on the basis of an additional condition that the clutch is turned on. According to this configuration, the drive of the engine is not prohibited only on the condition that the guide rail mechanism is in the open position, but the engine can be driven even when the guide rail mechanism is in the open position when the transmission of power to the threshing device is interrupted by the clutch. In other words, the driving of the engine is allowed even in a situation where the driving of the threshing device is avoided in the open posture of the rail mechanism. This enables the combine to travel, and therefore, even in a situation where the closed posture of the rail mechanism cannot be changed, the combine can be moved.

The open posture of the rail mechanism is generated both during driving of the engine and during stopping of the engine. Therefore, it is preferable that the engine drive management unit has two functions related to the prohibition of driving the engine. One of the functions is that the engine drive management unit prohibits the start of the engine when the open posture is detected by the guide rail posture detection unit before the start of the engine. The other function is that the engine drive management unit stops the driving engine when the open posture is detected by the rail posture detection unit while the engine is being driven.

In a preferred embodiment of the present invention, the guide rail device further includes a normally closed guide rail open detection switch that closes a contact when the guide rail mechanism is in the closed position and opens the contact when the guide rail mechanism is in the open position, and the guide rail posture detection unit is configured to detect the open position of the guide rail mechanism by flowing a current through the guide rail open detection switch. Since the open posture of the guide rail mechanism is detected by the guide rail open detection switch, if the open posture of the guide rail mechanism cannot be detected due to disconnection or poor connection of the signal line, the guide rail posture detection unit outputs an erroneous detection result, which is not preferable. This problem is solved by adopting a configuration in which the guide opening detection switch is normally closed and the open posture of the guide mechanism is detected when a current does not flow through the circuit of the guide opening detection switch.

In a preferred embodiment of the present invention, the combine harvester is provided with a manual operation tool for manually changing the posture of the rail mechanism and a rail opening operation switch for electrically driving the rail mechanism. This is preferable because the operator can change the posture of the guide rail mechanism by a method suitable for the situation.

In addition, when an electric motor is used as a driving force for changing the state of the straw conveying device composed of the conveying chain and the guide rail, it is required to operate with high reliability even in a farm land or the like which is a use environment of the combine harvester.

The combine harvester of the invention comprises an engine, a harvesting part driven by the rotary power of the engine and a threshing device, and comprises: a straw conveying device capable of changing a state between a first state and a second state; an electric motor unit having an electric motor for moving the straw conveying device from the first state to the second state by rotating more than a predetermined rotation angle from a home position (a start standby position of the motor); a minute rotation command unit that outputs a minute rotation command for causing the electric motor unit to rotate minute by an angle equal to or less than the predetermined rotation angle; a rotation detector that detects rotation of the electric motor; and an abnormality determination unit that determines that an abnormality has occurred when the rotation detector does not detect the minute rotation of the electric motor, regardless of an output of the minute rotation command.

According to this configuration, whether or not the electric motor unit, which is a power source for changing the straw conveying device between the first state and the second state, is operating normally, for example, the electric motor unit is not operating normally due to disconnection, poor connection, or the like, can be checked by slightly rotating the electric motor unit. A command for making a minute rotation of such a degree that the state of the straw conveying apparatus is not changed is applied to the electric motor constituting the electric motor unit, and as a result, when the electric motor does not rotate or does not reach the minute rotation corresponding to the rotation, it is considered that an abnormality occurs. This improves the reliability of the state change of the straw conveying device using the electric motor unit as a drive source.

In one of preferred embodiments of the present invention, the combine harvester further includes a clutch operated by a clutch motor of the electric motor unit, and a conveyor chain for conveying the harvested straw to the threshing device by engine power transmitted via the clutch, the conveyor chain being included in the straw conveyor device, and the clutch being in a power transmitting position in the first state and being in a power cut-off position in the second state. According to this configuration, when the conveyor chain is brought to an emergency stop, the clutch motor is rotated to disconnect the clutch, thereby blocking the transmission of power to the conveyor chain. This clutch motor is preferable because the reliability thereof can be confirmed by the minute rotation processing.

In a preferred embodiment of the present invention, the combine harvester further includes a rail mechanism that is capable of changing a posture between a closed posture in which the rail motor of the electric motor unit guides the grain stalks transported to the threshing device by the transport chain and an open posture in which the rail mechanism is separated from the transport chain, the rail mechanism being included in the grain stalk transport device, and being in the closed posture in the first state and being in the open posture in the second state. According to this configuration, when the guide rail mechanism is to be opened urgently, only the guide rail motor may be rotated. Further, the guide rail motor is preferable because the reliability thereof can be confirmed by the minute rotation processing.

In a preferred embodiment of the present invention, when the minute rotation of the electric motor by the output of the minute rotation command is detected, the minute rotation command unit reverses the electric motor to cancel the minute rotation. According to this configuration, it is possible to avoid a problem that the rotation amount of the grain stalk conveyor is changed due to accumulation of the minute rotations caused by the minute rotation processing.

In the operation check of the motor and the like in the micro-rotation process, if an abnormality is found, the state change required for the emergency of the straw conveying device cannot be performed. In a preferred embodiment of the present invention, the combine harvester further includes an engine drive management unit configured to prohibit driving of the engine when it is determined that the abnormality has occurred. This makes it possible to avoid a problem that the combine harvester runs and the threshing device and the conveyor chain are driven when the electric motor unit is not fully functional.

In a preferred embodiment of the present invention, the minute rotation is executed by the minute rotation command unit as an initial check process performed before the engine is started by the key switch, and the engine is prohibited from being started when it is determined that the abnormality has occurred. Therefore, it is preferable to check for a malfunction of the electric motor unit due to a disconnection, a connection failure, or the like occurring during a stop or a long-term non-use of the combine harvester before the engine is started. Of course, since there is a possibility that an operation failure of the electric motor unit may occur even during operation of the combine harvester, it is preferable that the minute rotation is executed by the minute rotation command unit during engine driving. In this case, if it is determined that an abnormality has occurred, the driver may be notified of the abnormality or the engine may be stopped.

Drawings

Fig. 1 is a schematic diagram illustrating the basic principle of the present invention.

Fig. 2 is a side view showing the combine.

Fig. 3 is a side view showing the threshing device and the conveyor chain.

Fig. 4 is a front view showing the rail mechanism.

Fig. 5 is a plan view showing the rail mechanism.

Fig. 6 is a left side view showing the threshing device.

Fig. 7 is a diagram showing a power transmission path in the combine harvester.

Fig. 8 is a sectional view VIII-VIII in fig. 6.

Fig. 9 is a cross-sectional view IX-IX in fig. 6.

Fig. 10 is a diagram showing an operation of the conveyor chain clutch, fig. 10(a) is a diagram showing a state in which the shaft body acts on the first vertical surface, fig. 10(b) is a diagram showing a state in which the shaft body acts on the inclined surface, and fig. 10(c) is a diagram showing a state in which the shaft body acts on the second vertical surface.

Fig. 11 is a left side view showing a state where the position of the operation member is held at the on position.

Fig. 12 is a sectional view showing the connection between the operation member and the position holding mechanism.

Fig. 13 is a left side view showing a state where the position holding of the operation member to the on position is released.

Fig. 14 is a functional block diagram showing a control function relating to the present invention.

Fig. 15 is a schematic diagram illustrating the basic principle of the present invention.

Fig. 16 is a side view showing the combine harvester.

Fig. 17 is a side view showing the threshing device and the conveyor chain.

Fig. 18 is a front view showing the rail mechanism.

Fig. 19 is a plan view showing the rail mechanism.

Fig. 20 is a left side view showing the threshing device.

Fig. 21 is a diagram showing a power transmission path in the combine harvester.

Fig. 22 is a sectional view VIII '-VIII' in fig. 20.

FIG. 23 is a cross-sectional view IX '-IX' of FIG. 20.

Fig. 24 is a diagram showing an operation of the conveyor chain clutch, fig. 24(a) is a diagram showing a state in which the shaft body acts on the first vertical surface, fig. 24(b) is a diagram showing a state in which the shaft body acts on the inclined surface, and fig. 24(c) is a diagram showing a state in which the shaft body acts on the second vertical surface.

Fig. 25 is a left side view showing a state where the position of the operation member is held at the on position.

Fig. 26 is a sectional view showing the connection between the operation member and the position holding mechanism.

Fig. 27 is a left side view showing a state where the position holding of the operation member to the on position is released.

Fig. 28 is a functional block diagram showing a control function relating to the present invention.

Description of the reference numerals

1: a harvesting part;

4: a threshing device;

7: a conveyor chain;

27: a guide rail mechanism;

31: a clutch;

53: a conveyor chain clutch;

83: a potentiometer;

119: a rail motor;

119A: a potentiometer (rotation detector);

150: a guide rail opening detection switch;

200: a control device;

200A: a control unit;

201: an engine control unit;

204: a motor control unit;

210: an input signal processing section;

220: an engine drive management unit;

250: a guide rail attitude control section;

260: a guide rail posture detection unit;

CU: a grain stalk conveying device;

e: an engine;

FT: a manual threshing grain and straw supply part;

KSW: a key switch;

MU: an electric motor unit;

SW: a switch group;

SW 1: a guide rail opening action switch;

SW 2: a clutch switch;

1': a harvesting part;

2': a running device;

4': a threshing device;

7': a conveyor chain;

53': a conveyor chain clutch;

83': a potentiometer (rotation detector);

119': a rail motor;

119A': a potentiometer (rotation detector);

200': a control device;

200A': a control unit;

201': an engine control unit;

204': a motor control unit;

220': an engine drive management unit;

230': a motor drive management unit;

231': a minute rotation command unit;

240': an abnormality determination unit;

CU': a grain stalk conveying device;

e': an engine;

ea': an output shaft;

FT': a manual threshing grain and straw supply part;

KSW': a key switch;

SW 1': a guide rail opening action switch;

SW 2': and a clutch switch.

Detailed Description

[ invention 1 ]

Before describing a specific embodiment of the combine harvester of the present invention, the basic configuration of the present invention will be briefly described with reference to fig. 1. The combine harvester illustrated in fig. 1 includes a harvesting unit 1 driven by the rotational power of an engine E, and a threshing device 4. The rotational power of the engine E is transmitted to the traveling device 2 including a crawler belt, wheels, and the like via a transmission mechanism and the like. Further, a conveying chain 7 constituting a grain and straw conveying unit CU for conveying the grain and straw harvested by the harvesting unit 1 to the threshing unit 4 is also driven by the engine E. A guide rail mechanism 27 is provided above the conveyor chain 7, and the guide rail mechanism 27 can be changed between a closed position in which it approaches the conveyor chain 7 to guide the grain stalks conveyed by the conveyor chain 7 from above and an open position in which it is separated upward from the conveyor chain 7. As a control system, comprising: a rail posture detecting unit 260 that detects an open posture of the rail mechanism 27; and an engine drive management unit 220 that prohibits the start of the engine E on the condition that the open posture of the rail mechanism 27 is detected by the rail posture detection unit 260. Further, the engine drive management unit 220 may be provided with a function of stopping the engine E. Engine drive management unit 220 applies a start prohibition instruction to engine control unit 201 when it is desired to prohibit starting of engine E during the stop of the engine, or applies a stop instruction to engine control unit 201 when it is desired to stop engine E during the driving of the engine. Engine control unit 201 controls engine E in accordance with an instruction from engine drive management unit 220.

When the guide rail mechanism 27 is kept in the open position, the engine drive management unit 220 prohibits the engine E from being started, so that the running and the driving of the threshing device 4 and the conveyor chain 7 can be avoided while the open position of the guide rail mechanism 27 is kept.

The combine harvester is provided with a clutch 31, and the clutch 31 turns on/off the power from the engine E to at least the threshing device 4. The clutch 31 is operated by a clutch lever, not shown. The clutch on position and the clutch off position of the clutch lever are detected by a clutch switch SW2, which is one of the sensor switch group SW, and applied to the control system as a detection signal. When it is desired to avoid driving of the threshing device 4 only while the open posture of the guide rail mechanism 27 is maintained, the on state of the clutch 31 is added as a condition for starting and stopping the engine E by the engine drive management unit 220 and stopping during driving.

One of specific configurations of the rail posture detecting unit 260 for detecting the open posture of the rail mechanism 27 is that a rail opening detecting switch 150 that is turned on/off by the closed posture and the open posture of the rail mechanism 27 is provided in the rail mechanism 27, and a signal from the rail opening detecting switch 150 is acquired via the input signal processing unit 210 of the control system to detect the open posture of the rail mechanism 27. At this time, in order to avoid that the open posture is not detected due to disconnection or poor connection of the signal line, a normally closed switch that closes the contact point when the rail mechanism 27 is in the closed posture and opens the contact point when the rail mechanism is in the open posture is adopted as the rail open detection switch 150. This is considered to be the open position of the rail mechanism 27 even when the signal line is disconnected or has a poor connection.

As a mechanism for changing the posture of the rail mechanism 27 between the closed posture and the open posture, a swing mechanism, a lifting mechanism, or the like can be employed. In short, as a driving source for changing the posture, either a manual force or a mechanical force or both of them are used. In the example of fig. 1, the rotational power of the rail motor 119 (indicated by M1 in fig. 1) provided in the electric motor unit MU is used as the mechanical power. Since the guide motor 119 is used, the control system includes: a rail posture control unit 250 that generates an open posture command for bringing the rail mechanism 27 into an open posture; and a motor control unit 204 that applies a control signal to the rail motor 119 in response to the open posture command. As an operation member for bringing the rail mechanism 27 operated by the operator into the open position, a rail open operation switch SW1, which is one of the sensor/switch groups SW, is provided, and the rail position control unit 250 outputs an open position command based on a signal from the rail open operation switch SW 1.

Since the combine harvester cannot harvest grain stalks such as the corners of the field, the operator manually harvests the grain stalks. The threshing device 4 of the stopped combine is driven, and the grain stalks previously harvested by the manual operation are placed on the conveyor chain 7 and fed into the threshing device 4 to be threshed. The threshing work involving such manual work is referred to as manual threshing work. In the manual threshing operation, a manual threshing straw supply unit FT for manually supplying the straw to the conveyor chain 7 is formed in a region between the harvesting unit 1 and the threshing device 4.

Next, one of embodiments of the combine harvester of the present invention will be described with reference to the drawings. Fig. 2 shows a half-feed type combine as an example of a combine for harvesting rice, wheat, and the like. The front part of the combine harvester is provided with a harvesting part 1 for harvesting and planting the grain stalks. A crawler-type traveling device 2 capable of traveling is provided behind the harvesting unit 1. A body frame 3 is provided above the traveling device 2.

A threshing device 4 for threshing the harvested rice straws is arranged on the left side of the machine body frame 3. A row rod cutting device 5 for cutting the row rods is arranged behind the threshing device 4. A conveying chain 7 for conveying the harvested rice straws to the threshing device 4 is arranged at the left side of the threshing device 4.

The right front portion of the body frame 3 is provided with an operation portion 6 and an engine E. A grain collecting box 8 for storing grains is arranged at the rear part of the right side of the machine body frame 3. The grain collecting box 8 is provided with a grain unloading device 9 for taking out grains in the grain collecting box 8.

Through the structure, the combine harvester utilizes the traveling device 2 to travel and utilizes the harvesting part 1 to harvest and plant the grain stalks, the conveying chain 7 is utilized to convey the harvested grain stalks to the threshing device 4, and the threshing device 4 is utilized to thresh the harvested grain stalks. After threshing the harvested grain stalks with the threshing device 4, the grains are stored in the grain collecting box 8. The utility model can also be directly discharged to the farmland, but can also be cut by the utility model 5 and discharged to the farmland.

As shown in fig. 3 and 4, a threshing chamber 10 is formed at an upper portion of the threshing device 4. The threshing chamber 10 is provided with a threshing cylinder 11 for threshing processing so as to be rotatable about a threshing cylinder axis Y1 (in the direction of arrow R1 shown in fig. 4) oriented in the front-rear direction. The threshing cylinder 11 has a plurality of threshing teeth 12. A screen 13 for allowing a treated material (threshed treated material) obtained by the threshing process to leak is provided below the threshing cylinder 11.

A conveying chain 7 for clamping and conveying the reaped rice straws along a threshing opening 10a of the threshing chamber 10 is arranged at the left side of the threshing chamber 10. A guide rail mechanism 27 for holding the harvested straw together with the conveyor chain 7 is provided at a position facing the conveyor chain 7 in the vertical direction. A dust exhaust fan 14 for exhausting dust to the outside and a bar chain 15 for conveying bars to the bar cutting device 5 are provided behind the threshing chamber 10.

The lower part of the threshing device 4 is provided with a swing screening device 16 for swing screening, a main cleaning fan 17 for air cleaning, an auxiliary cleaning fan 18 and a secondary cleaning fan 19. A primary recovery unit 20 and a secondary recovery unit 21 are provided behind the main cleaning fan 17 in this order from the front.

The primary recovery unit 20 is used to recover grains of the primary treatment product. The primary recovery unit 20 is provided with a primary transverse auger 22 for conveying grains of the primary treatment product in the left-right direction. The primary recovery part 20 is connected with a winnowing device 23 for winnowing the grains of the primary treatment object to convey to the grain collecting box 8.

The secondary recovery unit 21 is used to recover grains of the secondary processed product. The secondary recovery unit 21 is provided with a secondary cross auger 22a for conveying grains of the secondary processed material in the left-right direction. The secondary recovery unit 21 is connected to a secondary reduction device 21a for reducing grains of the secondary processed product to the swing sifting device 16.

With the above configuration, in the threshing device 4, while the harvested grain stalks are held and conveyed by the conveying chain 7, the threshing process is performed by the threshing cylinder 11, and the threshed product is dropped from the screen 13. The threshed objects that have leaked from the screen 13 are subjected to swing screening by a swing screening device 16 and are subjected to air cleaning by a main cleaning fan 17, an auxiliary cleaning fan 18 and a secondary cleaning fan 19. Thus, the grain having a high specific gravity is collected as a primary processed product by the front primary collection unit 20, and winnowed by the winnowing device 23 and conveyed to the grain collection box 8. The grain with branches having a low specific gravity is recovered as a secondary processed product by the subsequent secondary recovery unit 21, and is reduced to the swing sifting device 16 by the secondary reducing device 21 a.

Next, the rail mechanism 27 will be described with reference to fig. 3, 4, and 5.

As shown in fig. 3 and 4, the guide rail mechanism 27 holds the reaping straw together with the conveyor chain 7 at a position facing the conveyor chain 7 in the vertical direction. The rail mechanism 27 is configured to be vertically swingable about a lateral axis X4. The rail mechanism 27 is biased to swing upward by a damper 100 (corresponding to a "biasing mechanism" of the present invention). The rail mechanism 27 is configured to be positionable by the positioning mechanism 98 at a position facing the conveyor chain 7 in the vertical direction. When the positioning mechanism 98 is released from the positioning, the rail mechanism 27 is configured to swing upward to a position where the threshing opening 10a is opened by the damper 100.

The rail mechanism 27 includes a rail 101 and a rail frame 102. The guide rail 101 holds the harvested straw together with the conveyor chain 7. The guide rail 101 is configured to extend along an upper conveying path of the conveyor chain 7 at a position facing the conveyor chain 7 in the vertical direction. The guide rail 101 is formed to have a length at least extending over the entire length of the threshing cylinder 11 in the direction of the axis Y1.

The rail frame 102 supports the rail 101. Specifically, the rail frame 102 elastically supports the rail 101 via a plurality of springs 103.

More specifically, a plurality of ducts 104 are attached to the rail frame 102 in the vertical direction at predetermined intervals along the longitudinal direction of the rail frame 102. A plurality of rods 106 inserted into the duct 104 are attached to the rail 101 in the vertical direction at predetermined intervals in the longitudinal direction of the rail 101. A spring 103 is fitted around the rod 106. An upper spring receiving portion 105 that receives an upper end portion of the spring 103 is fixed to the pipe 104. A lower spring receiving portion (not shown) that receives a lower end portion of the spring 103 is fixed to the rod 106. In this way, the rail frame 102 elastically supports the rail 101 via the plurality of springs 103.

The rail frame 102 is supported by an upper sidewall 4A forming a side portion of the threshing chamber 10 so as to be swingable up and down. Specifically, the rail frame 102 is configured to be vertically swingable about the lateral axis X4 at a rear fulcrum. A swing shaft 108 for vertically swingably supporting the rear end portion of the rail frame 102 is provided on the upper sidewall 4A. The rail frame 102 is configured to be vertically swingable integrally with a lateral outer cover 109 covering the upper sidewall 4A. The rail frame 102 is attached to the inner surface side of the lateral exterior cover 109 via a mounting frame 110.

Shock absorber 100 is a gas spring type shock absorber. The shock absorber 100 includes a cylinder 111 and a rod 112 telescopically inserted into the cylinder 111. An end of the cylinder 111 is swingably attached to a pin 113 provided on the upper sidewall 4A. The end of the lever 112 is swingably attached to the rail frame 102. Specifically, the end of the lever 112 is swingably attached to an attachment bracket 114 fixed to the upper surface of the rail frame 102.

As shown in fig. 4 and 5, the positioning mechanism 98 includes a positioning lever 115 and a click roller 116.

The positioning operation lever 115 is provided on the upper sidewall 4A and is configured to be swingable about a lever axial center Z1 in the up-down direction. The positioning operation lever 115 is driven to swing by a rail motor 119 constituting the electric motor unit MU. The positioning operation lever 115 includes a lever main body 115A and a handle portion 115B.

The lever main body 115A is supported by the support plate 117 so as to be able to swing. The lever main body 115A is formed of a plate-like member. The lever main body 115A is configured to be engageable with an engagement roller 116 provided on the rail frame 102.

The handle 115B is coupled to the lever main body 115A. Specifically, the handle 115B is connected to the lever main body 115A in a state of intersecting the lever main body 115A at a predetermined inclination angle in plan view. The predetermined inclination angle is set such that the handle portion 115B is parallel or substantially parallel to the axis Y1 direction of the threshing cylinder 11 in a state where the positioning mechanism 98 positions the rail mechanism 27 to face the conveyor chain 7 in the vertical direction.

The handle portion 115B is configured to be capable of being held by a clip-in (clip-on) fixing member 123 provided on the inner surface side of the lateral exterior cover 109. Handle portion 115B protrudes forward from lateral exterior cover 109 covering upper sidewall 4A. Thus, the handle portion 115B is preferably a hand-held portion when the positioning operation lever 115 is configured to be manually operable.

As shown in fig. 4, a projection 117a that swingably supports the lever main body 115A is formed on the support plate 117. The support plate 117 is fixed to the distal end of the upper sidewall 4A by a bolt 118. The support plate 117 has a vertically long bolt hole 117b through which a bolt 118 is inserted. This enables the vertical position of the positioning lever 115 to be adjusted by adjusting the support plate 117.

As shown in fig. 4 and 5, the rail motor 119 is mounted to the front surface of the front wall 4B forming the front part of the threshing chamber 10. The rail motor 119 is driven by operating a rail opening operation switch SW1 (see fig. 14). The rail motor 119 has an output shaft 119a in the front-rear direction. A swing arm 120 is connected to an output shaft 119a of the rail motor 119. The swing arm 120 is connected to the lever main body 115A via a link 121. A potentiometer 119A is provided on the output shaft 119A, and the potentiometer 119A serves as a rotation detector for detecting a rotation angle of the output shaft 119A, in other words, a rotation angle of the rail motor 119.

The engaging roller 116 can engage with the lever main body 115A. The engaging roller 116 is provided on the rail mechanism 27. Specifically, the engagement roller 116 is supported by the front end portion of the rail frame 102 so as to be rotatable about the roller axis Y4 in the front-rear direction.

With the above-described structure, the rail mechanism 27 is positioned at a position facing the conveyor chain 7 in the vertical direction by the stopper effect due to the engagement of the lever main body 115A with the engagement roller 116. At this time, handle portion 115B is held by fixture 123.

When the rail opening operation switch SW1 is operated in a state where the rail mechanism 27 is positioned to face the conveyor chain 7 in the vertical direction, the swing arm 120 connected to the output shaft 119a of the rail motor 119 swings (in the direction of arrow R2 shown in fig. 4). Then, the positioning operation lever 115 is swung around a lever axial center Z1 in the vertical direction (in the direction of an arrow R3 shown in fig. 5) in a state where the positioning operation lever 115 is pulled toward the swing arm 120 via the link 121. The positioning lever 115 is restricted from swinging in the direction of arrow R3 by coming into contact with the contact piece 122. Thus, when the engagement between the lever main body 115A and the engagement roller 116 is released (lock release), in other words, when the positioning of the positioning mechanism 98 is released, the rail frame 102 swings upward by the damper 100 to a position where the threshing opening 10a is opened, and the rail mechanism 27 is opened. (refer to fig. 3).

As shown in fig. 3, a rail open detection switch 150 is provided on the body-side member in a region near the base end side of the rail frame 102. The open rail detection switch 150 has a switch lever 151 that swings about a horizontal axis, and is turned ON at an upper swing position and turned OFF at a lower swing position. A substantially J-shaped arm 160 extending downward from the rod inner surface of the rail frame 102 and further protruding in the lateral direction is fixed to a region corresponding to the rail open detection switch 150. The protruding portion of the arm 160 is located below the switch lever 151. When the rail frame 102 swings upward, the protruding portion of the arm 160 pushes up the switch lever 151 to the upper swing position, thereby switching the state of the rail open detection switch 150. In other words, the open-rail detection switch 150 is normally closed, and is in an energized state in the closed posture of the rail mechanism 27 and is in a non-energized state in the open posture of the rail mechanism 27.

As shown in fig. 6, a transmission device 50 for transmitting power to the conveyor chain 7 is provided at the rear of the threshing device 4. The power of the output shaft 52 of the transmission 50 is made to surround the conveyor chain 7. The transmission device 50 includes a transmission chain clutch 53 that selectively transmits and disconnects the power. The structure of the conveyor chain clutch 53 will be described in detail later.

As shown in fig. 7, the power of the output shaft Ea of the engine E is transmitted to the input shaft Ma of the transmission M via a belt B1. The power of the output shaft Mb of the transmission M is transmitted to the harvesting input shaft 1a of the harvesting unit 1 via the belt B2. A harvesting clutch (for example, a tension clutch) that can switch between a state of transmitting power to the harvesting unit 1 and a state of cutting off power transmitted to the harvesting unit 1 is provided on a path of transmitting power to the harvesting input shaft 1 a.

The power of the output shaft Ea of the engine E is transmitted to the counter shaft 25 via the belt B3. A clutch 31 called a threshing clutch is interposed in the belt B3. The power of the auxiliary shaft 25 is transmitted to the threshing cylinder 11, the main cleaning fan 17 and the primary transverse auger 22.

Specifically, the power of the counter shaft 25 is transmitted to the threshing cylinder 11 via the branch shaft 26 and the belt B4. The power of the secondary shaft 25 is transmitted to the main cleaning fan 17 via a belt B5. The power of the auxiliary shaft 25 is transmitted to the primary transverse auger 22 through a belt B6.

The power of the primary transverse auger 22 is transmitted to the secondary transverse auger 22a, the input shaft 16a of the swing screen device 16, and the input shaft 51 of the transmission device 50 via the belt B7. The power of the input shaft 51 of the transmission device 50 is transmitted to the input shaft 14a of the dust exhaust fan 14. The power of the input shaft 51 of the transmission device 50 is transmitted to the ejector bar cutter 5 via the belt B8.

Next, the conveyor chain clutch 53 will be described with reference to fig. 8 to 13.

As shown in fig. 8 and 9, the conveyor chain clutch 53 is configured to be switchable between a transmission state in which power is transmitted to the conveyor chain 7 and a disconnection state in which power transmitted to the conveyor chain 7 is disconnected. The transmission chain clutch 53 has an output gear 54 and a transmission cylinder 55 that are opposed to each other and can be engaged with each other on the output shaft 52.

The output gear 54 is provided on the output shaft 52 so as to be relatively rotatable. The power of the input gear 56 is transmitted to the output gear 54 via the first relay gear 57, the second relay gear 58, and the third relay gear 59. The power of the output gear 54 is transmitted to the output shaft 52 via the transmission drum 55. A claw portion 54a for engaging with the transmission cylinder 55 (claw portion 55a) is formed on a surface (left side surface) of the output gear 54 on the side facing the transmission cylinder 55.

The transmission cylinder 55 is provided on the output shaft 52 so as to be integrally rotatable and movable in the axial direction (left-right direction) of the output shaft 52. In other words, the transmission cylinder 55 is spline-fitted to the output shaft 52. The transmission cylinder 55 is biased by a spring 60 so as to move toward the output gear 54 (rightward). A claw portion 55a for engaging with the output gear 54 (claw portion 54a) is formed on a surface (right side surface) of the transmission cylinder 55 on the side facing the output gear 54. A flange portion 55A having a substantially circular shape when viewed in the axial direction of the output shaft 52 (side view) is formed at the left end portion of the transmission cylinder 55.

A first vertical surface 55b, a second vertical surface 55c, and a collective inclined surface 55d are formed on a surface (right surface) of the flange portion 55A facing the output gear 54 (see fig. 10). The first vertical surface 55b and the second vertical surface 55c are formed perpendicular to the output shaft 52. The first vertical surface 55b and the second vertical surface 55c are formed in a stepped shape. The second vertical surface 55c is located on the side (right side) of the output gear 54 with respect to the first vertical surface 55b in the axial direction (left-right direction) of the output shaft 52. The inclined surface 55d is formed around the axial direction of the output shaft 52 on the outer peripheral portion of the first vertical surface 55b and the outer peripheral portion of the second vertical surface 55 c. The inclined surface 55d is formed to have a predetermined cam profile.

As shown in fig. 11, 12, and 13, the operating member 40 is configured to be switchable between an on position corresponding to the transmission state of the conveyor chain clutch 53 and an off position corresponding to the off state of the conveyor chain clutch 53. The operating member 40 switches the conveyor chain clutch 53 to the disengaged state by switching to the off position. In other words, the operation member 40 moves the transmission cylinder 55 to the engagement releasing side by switching to the off position. The operation member 40 includes a swinging piece 41 and a shaft body 42.

The swing piece 41 is configured to be swingable between the on position and the off position around a swing axis X4 in the left-right direction. The swing piece 41 is urged by a spring 45 to swing toward the on position side. The swing piece 41 is supported by the left side portion of the transmission case 50A of the transmission device 50 via a swing shaft 43 in the left-right direction. The swing piece 41 is formed with a first swing arm portion 41a and a second swing arm portion 41 b. A spring 45 is coupled to the second swing arm portion 41b of the swing piece 41.

The shaft body 42 is connected to the first swing arm portion 41a via a connecting pin 44 in the left-right direction. The shaft body 42 is configured to be able to contact and separate from the transmission cylinder 55 in a direction perpendicular to the output shaft 52. The shaft body 42 is supported by a transmission case 50A of the transmission device 50 so as to be movable in the vertical direction. The swinging piece 41 swings to the off position side, and the shaft body 42 comes into contact with the transmission cylinder 55 so as to apply a moving force to the engagement releasing side (left side).

The operation of the conveyor chain clutch 53 will be described with reference to fig. 10.

As shown in fig. 10(a), in a state where the shaft body 42 is in contact with the first vertical surface 55b, the transmission cylinder 55 does not move in the axial direction (left-right direction) of the output shaft 52 even when it rotates. In other words, the conveyor chain clutch 53 maintains the transmission state.

Next, as shown in fig. 10(b), in a state where the shaft body 42 is in contact with the inclined surface 55d, the transmission cylinder 55 gradually moves toward the engagement releasing side (left side) with rotation. In other words, the conveyor chain clutch 53 moves from the transmitting state to the cut-off state.

Finally, as shown in fig. 10 c, in a state where the shaft body 42 is in contact with the second vertical surface 55c, the transmission cylinder 55 does not move in the axial direction (the left-right direction) of the output shaft 52 even when it rotates. In other words, the conveyor chain clutch 53 is maintained in the disengaged state. Thereafter, the swing piece 41 swings to the on position side, and the shaft body 42 is separated from the transmission cylinder 55. Thereby, the transmission cylinder 55 moves toward the output gear 54 (rightward) by the biasing force of the spring 60, and the transmission chain clutch 53 is switched to the transmission state.

As shown in fig. 11, 12, and 13, the position holding mechanism 70 holds the position of the operating member 40 at the on position. The position holding mechanism 70 is configured to be connectable to the operation member 40 via a connection rod 61 (corresponding to a "connection member" of the present invention). The position holding mechanism 70 includes a first holding arm 71 coupled to the operating member 40 side and a second holding arm 72 coupled to the release mechanism 80 side. In the left-right direction of the body, a first holding arm 71 and a second holding arm 72 are arranged in this order from the inner side (right side) of the body. The first holding arm 71 and the second holding arm 72 are connected to each other so as to be capable of relative swinging, and have portions that abut against each other so as to prevent relative swinging.

A projection 71a is provided at one end of the first holding arm 71. The projection 71a of the first holding arm 71 is coupled to the coupling shaft 61a of the link 61 so as to be swingable about the first swing axis X1. In a state where the coupling shaft 61a of the connecting rod 61 penetrates the projection 71a of the first holding arm 71, the first holding arm 71 and the connecting rod 61 are fixed by the bolt 73 so as to be prevented from coming off.

A projection 71b is provided at the other end of the first holding arm 71. The projection 71b of the first holding arm 71 is coupled to the coupling shaft 72a of the second holding arm 72 so as to be swingable about the second swing axis X2. In a state where the coupling shaft 72a of the second holding arm 72 is inserted through the projection 71b of the first holding arm 71, the first holding arm 71 and the second holding arm 72 are fixed by the bolt 74 so as to be prevented from coming off.

A first contact portion 71c, which is a portion capable of contacting the second holding arm 72, is formed at the other end portion of the first holding arm 71. The first abutment portion 71c is integrally formed with the first holding arm 71. The first contact portion 71c is formed such that a portion on one side protrudes to the other side with the protrusion portion 71b (second swing axis X2) at the other end portion of the first holding arm 71 interposed therebetween.

A projection 72b is provided at the other end of the second holding arm 72. The protrusion 72b of the second holding arm 72 is supported by the swing shaft 75 so as to be swingable around the third swing axis X3. In a state where the swing shaft 75 penetrates the protrusion 72b of the second holding arm 72, the second holding arm 72 and the swing shaft 75 are fixed by the bolt 76 so as to be prevented from slipping off. A handle 77 and an operation piece 78 are connected to the projection 72b of the second holding arm 72 so as to be integrally rotatable.

The second holding arm 72 is provided with a second contact portion 72c which is a portion capable of contacting the first contact portion 71 c. The second contact portion 72c is formed of a member (plate-like member) different from the second holding arm 72. The second contact portion 72c is fixed to a surface of the second holding arm 72 on the inner side (right side) of the body in a state substantially perpendicular to the second holding arm 72. The second contact portion 72c is disposed obliquely with respect to a line connecting the second pivot axis X2 and the third pivot axis X3 in side view. In other words, the second contact portion 72c is inclined such that one end portion is positioned on one side with the second pivot axis X2 therebetween in a side view.

The swing shaft 75 is fixed to the left side wall of the threshing device 4 via a fixing plate 75a by a bolt 79. The swing shaft 75 and the projection 72B of the second holding arm 72 project from the left inner cover 4C covering the left side wall of the threshing device 4 toward the outside (left) of the machine body in the lateral direction inside the left outer cover 4B. A handle 77 is integrally rotatably coupled to the protrusion 72b of the second holding arm 72 on the outer side of the left inner cover 4C.

The connecting rod 61 is configured to be able to connect the operating member 40 to the position holding mechanism 70. The link 61 is disposed laterally outward (leftward) of the body with respect to the swing piece 41 and the first holding arm 71. The link 61 is configured to be swingable about a swing axis X4 in the left-right direction. The link lever 61 is urged by the spring 63 to swing clockwise about the swing axis X4 in the left side view. The connecting rod 61 has a connecting rod main body 61A and a connecting piece 61B.

A connecting piece 61B is fixed to one end of the connecting rod body 61A. A spring 63 is coupled to an end (connecting piece 61B) of the connecting rod 61 on the operating member 40 side. The connecting piece 61B is formed with a first connecting arm portion 61B and a second connecting arm portion 61 c. A left side surface of the first connecting arm portion 61b is fixed to one end portion of the connecting rod main body 61A. A spring 63 is coupled to the second connecting arm portion 61 c.

The connecting piece 61B is supported by the left side portion of the transmission case 50A of the transmission device 50 via the swing shaft 43 in the left-right direction. In other words, the connecting rod 61 is supported by the same swing shaft 43 as the operating member 40. Further, the connecting piece 61B is provided with a left-right direction operating pin 64 (corresponding to an "operating portion" of the present invention) so as to protrude toward the inner side (right side) of the machine body. The action pin 64 is configured to be able to apply a swinging force to the swinging piece 41 toward the off position. The action pin 64 is configured to be able to abut against the rear surface of the second swing arm portion 41b in the swing piece 41.

As shown in fig. 11, the release mechanism 80 releases the position holding of the operating member 40 to the on position by the position holding mechanism 70 by swinging the second holding arm 72 to the side of releasing the contact with the first holding arm 71. The release mechanism 80 includes: a wire harness 82, a clutch motor 81, and a potentiometer 83 as a rotation detector that detects the rotation angle of the clutch motor 81. The clutch motor 81 and the potentiometer 83 are connected to the control device 200 (see fig. 14). The clutch motor 81 and the potentiometer 83 are mounted on the mounting plate 84.

The clutch motor 81 is operated to swing the second holding arm 72 to the side of releasing the contact with the first holding arm 71 via the wire harness 82. The clutch motor 81 is driven by a clutch switch SW2 (see fig. 14). The clutch motor 81 is attached to the attachment plate 84 from the inner side (right side) of the machine body. The clutch motor 81 has a motor shaft 81a in the left-right direction. The motor shaft 81a projects laterally outward (leftward) from the mounting plate 84. A first motor arm 90 and a second motor arm 91 are connected to the motor shaft 81a so as to be integrally rotatable.

The wire harness 82 is coupled to the second holding arm 72 side. The harness 82 has an inner harness 82a and an outer harness 82 b. Both ends of the outer wire 82B are supported by

wire harness holders

93A, 93B. One end of the inner harness 82a is connected to the operation piece 78. The other end of the inner harness 82a is connected to the first motor arm 90.

Whether or not the second motor arm 91 is located at the initial position P0 can be determined based on the swing angle of the second motor arm 91 detected by the potentiometer 83 as a rotation detector of the clutch motor 81. The potentiometer 83 is attached to the attachment plate 84 from the inner side (right side) of the body. The potentiometer 83 has a potential axis 83 a. The potential shaft 83a projects laterally outward (leftward) from the mounting plate 84. The potential arm 92 is integrally rotatably connected to the potential shaft 83 a. The potential arm 92 is provided with a contact portion 92a that contacts the second motor arm 91.

The attachment plate 84 is formed with a notch 84a into which the clutch motor 81 enters and a notch 84b into which the potentiometer 83 enters. The mounting plate 84 is supported by a front support leg 86 and a pair of upper and lower rear support legs 85.

As shown in fig. 11, the first holding arm 71 is in contact with the second holding arm 72 and is prevented from swinging relatively, and the position of the operating member 40 is held at the on position by the position holding mechanism 70. As described above, the link lever 61 is biased by the spring 63 to swing clockwise about the swing axis X4 in the left side view, and the first holding arm 71 is also biased to swing to the side in contact with the second holding arm 72 (clockwise about the second swing axis X2 in the left side view). In other words, the state in which the first abutting portion 71c of the first holding arm 71 abuts against the second abutting portion 72c of the second holding arm 72 is held by the urging force of the spring 63.

Here, in a state where the first contact portion 71c of the first holding arm 71 and the second contact portion 72c of the second holding arm 72 are in contact with each other, the link 61 does not swing clockwise about the swing axial center X4 in a left side view. In other words, in a state where the first abutting portion 71c of the first holding arm 71 abuts against the second abutting portion 72c of the second holding arm 72, in other words, in a state where the position holding mechanism 70 holds the position of the operating member 40 at the on position, the link lever 61 does not transmit the urging force of the spring 63 to the operating member 40. Therefore, in a state where the position holding mechanism 70 holds the position of the operating member 40 at the on position, the acting pin 64 does not apply the swinging force toward the off position to the swinging piece 41.

As shown in fig. 13, when the release mechanism 80 is operated, the position holding mechanism 70 releases the position holding of the operating member 40 to the on position. Specifically, when the clutch motor 81 is driven by the clutch switch SW2 (see fig. 14), the first motor arm 90 swings counterclockwise about the motor shaft 81a when viewed from the left side. Then, the second holding arm 72 swings clockwise about the third swing axis X3 via the harness 82 and the operation piece 78 in the left side view. Thereby, the contact between the first contact portion 71c of the first holding arm 71 and the second contact portion 72c of the second holding arm 72 is released. In other words, the second holding arm 72 is operated by the clutch motor 81 to swing to the side of releasing the contact with the first holding arm 71 (clockwise about the third swing axis X3 in the left side view) via the wire harness 82.

Here, when the second holding arm 72 swings to the side of releasing the contact with the first holding arm 71 (clockwise about the third swing axis X3 in a left side view), the state where the link lever 61 does not transmit the urging force of the spring 63 to the operating member 40 is switched to the state where the urging force of the spring 63 is transmitted to the operating member 40 at a position (dead point) where a line connecting the first swing axis X1, the second swing axis X2, and the third swing axis X3 is a straight line in a side view. In other words, the spring 63 has a function as an urging force for bringing the first contact portion 71c of the first holding arm 71 into contact with the second contact portion 72c of the second holding arm 72, and a function as an urging force for swinging the swinging piece 41 toward the off position (switching the operating member 40 to the off position), and the two functions are switched with the dead point as a boundary.

In the left side view, the link lever 61 swings clockwise about the swing axis X4 by the biasing force of the spring 63, and the action pin 64 abuts against the rear surface of the swing piece 41 (second swing arm portion 41b), thereby applying a swing force toward the off position to the swing piece 41. The swinging piece 41 swings to the off position side, and the conveyor chain clutch 53 is switched to the off state.

Further, when the handle 77 is manually swung clockwise about the third swing axis X3 in the left side view, the contact between the first contact portion 71c of the first holding arm 71 and the second contact portion 72c of the second holding arm 72 can be released, and the position holding of the operating member 40 to the on position can be released.

Here, in the state where the operating member 40 is switched to the off position, the wire harness 82 is loosened. Therefore, the handle 77 can be manually swung counterclockwise about the third swing axis X3 to return to the original position when viewed from the left. In other words, when the handle 77 is manually swung counterclockwise about the third swing axis X3 in the left side view, the first contact portion 71c of the first holding arm 71 and the second contact portion 72c of the second holding arm 72 can be brought into contact with each other, and the position of the operating member 40 can be held at the on position.

Fig. 14 shows various functional blocks for explaining control functions related to posture change control of the rail mechanism 27 and on/off control of the conveyor chain clutch 53 in the control device 200 mounted on the combine. The control device 200 includes an engine control unit 201, a device control unit 203, a motor control unit 204, an input signal processing unit 210, and a control unit 200A as functional units particularly relevant to the present invention, and the functional units are connected to each other by an in-vehicle LAN or other data transmission lines.

The engine control unit 201 transmits a control signal to the engine E to perform start/stop, drive/stop, adjustment of the engine speed, and the like of the engine E. The motor control unit 204 transmits a control signal to the electric motor unit MU to control the operations of the rail motor 119 and the clutch motor 81. The device control unit 203 applies a control signal to the engine E, hydraulic devices other than the electric motor unit MU, and electric devices to perform a desired operation. The device control unit 203 and the electric motor unit MU may be combined.

The input signal processing unit 210 also functions as an input interface of the control device 200, receives signals from various devices such as the sensor/switch group SW, performs signal processing according to the need, and transmits the signals to the functional units of the control device 200. For convenience of explanation, the clutch switch SW2, the rail open operation switch SW1, the key switch KSW, the potentiometer 83, the rail open detection switch 150, and the potentiometer 119A are shown separately for the sensor/switch group SW. The clutch switch SW2 detects the on position or the clutch off position of the clutch 31. The rail open operation switch SW1 is a switch for moving the rail mechanism 27 to the open position. The key switch KSW has at least a first operating position and a second operating position that transition in order from the OFF position. In the first operating position, power is supplied to each functional unit included in the control system, and the functional unit is activated. In the second operating position, the starter motor is started and the engine E is started. The potentiometer 83 functions as a rotation detector for operating the clutch motor 81 of the conveyor chain clutch 53. The potentiometer 119A functions as a rotation detector that detects the rotation angle of the rail motor 119. The rail open detection switch 150 detects that the rail mechanism 27 is in the open position.

The control unit 200A includes an engine drive management unit 220, a motor drive management unit 230, an abnormality determination unit 240, a guide rail posture control unit 250, and a guide rail posture detection unit 260 as functional units that realize their functions mainly by executing programs.

The rail posture detecting unit 260 detects the open posture of the rail mechanism 27 based on the detection signal from the rail open operation switch SW 1. The rail posture control unit 250 gives a command to the motor control unit 204 to open the rail mechanism 27 based on a signal from the rail opening operation switch SW1 operated by the operator. Thereby, the motor control unit 204 rotates the rail motor 119 to move the rail mechanism 27 from the closed posture to the open posture.

The minute rotation command unit 231 of the motor drive management unit 230 outputs minute rotation commands to the rail motor 119 and the clutch motor 81 to such an extent that the state of the rail mechanism 27 and the conveyor chain clutch 53 is not changed. The reverse rotation minute rotation command from the minute rotation command unit 231 cancels the minute rotation generated by the rail motor 119 and the clutch motor 81.

The abnormality determination unit 240 determines that an abnormality such as a disconnection or connection failure of a signal line, a control line, or a power line, a failure of the guide rail motor 119 or the clutch motor 81, or a failure of another operating device has occurred, in the case where the micro-rotation corresponding to at least one of the guide rail motor 119 and the clutch motor 81 is not detected by the

potentiometers

119A and 83 as the rotation detectors, regardless of the output of the micro-rotation command from the micro-rotation command unit 231.

The engine drive management unit 220 has the following two functions.

(a) The driving of the engine E is prohibited on the condition that the open posture of the rail mechanism 27 is detected by the rail posture detecting unit 260. At this time, when it is desired to prohibit starting of the engine E during the engine stop, a start prohibition command is given to the engine control unit 201, and when it is desired to stop the engine E during the engine drive, a stop command is given to the engine control unit 201.

(b) When it is determined by the abnormality determination unit 240 that an abnormality has occurred, a command for prohibiting driving of the engine E, a start prohibition command, or a stop command is output to the engine control unit 201.

In this embodiment, when performing maintenance inspection of the combine harvester, the stop of the engine E, the stop of the driving of the threshing device 4, the disconnection (disconnection) of the conveyor chain clutch 53, the release of the rail mechanism 27, and the like can be performed at one time by operating the inspection switches included in the sensor/switch group SW. When the maintenance inspection is completed, the conveyor chain clutch 53 is manually connected (turned on) and the guide rail mechanism 27 is manually closed. At this time, even if the maintenance inspector forgets to return the guide rail mechanism 27 to the closed posture, the drive of the engine E, the drive of the threshing device 4, and the drive of the conveyor chain 7 are prohibited by the function of the control unit 200A, and therefore, the combine does not travel and the threshing work is not performed in the open posture of the guide rail mechanism 27.

Another embodiment of the present invention will be described below.

(1) The functional units shown in fig. 1 and 14 are separated by way of example, and the functional units may be combined or divided. Any configuration of functional units may be adopted as long as the control function of the present invention can be realized, and these functions may be realized by hardware, software, or both.

(2) The sensors or switches according to the present invention, for example, the clutch switch SW2, the rail open operation switch SW1, the key switch KSW, the potentiometer 83, the rail open detection switch 150, and the potentiometer 119A may be configured differently from the above-described embodiment, or may be disposed at positions different from the above-described embodiment.

Industrial applicability of the invention

The present invention can be applied to a combine harvester equipped with a grain straw conveying device CU for feeding harvested grain straws into a threshing device 4.

[ invention 2 ]

Before describing a specific embodiment of the combine harvester of the present invention, the basic structure of the present invention will be briefly described with reference to fig. 15. The combine harvester illustrated in fig. 15 includes a harvesting unit 1 ' driven by the rotational power of an engine E ' and a threshing device 4 '. The rotational power of the engine E 'is transmitted to the traveling device 2' including a crawler belt, wheels, and the like via a transmission mechanism and the like. Also, a grain and straw conveying unit CU 'for conveying the grain and straw harvested by the harvesting portion 1' to the threshing unit 4 'is driven by the engine E'. The grain-straw conveying device CU' is capable of changing the state between a first state as a regular form of the conveying device or a second state out of the regular form. The change of state of the straw conveying unit CU 'is performed by means of an electric motor unit MU' having at least one electric motor, in other words by means of an electric drive.

In the example shown in fig. 15, the grain and straw conveying unit CU ' includes a conveying chain 7 ' for conveying the harvested grain and straw to the threshing unit 4 ', and a guide rail mechanism 27 ' disposed above the conveying chain 7 '. The power transmission device further includes a transmission chain clutch 53 'that can be switched between a power transmission position (on) for transmitting the engine power to the transmission chain 7' and a power cutoff position (off) for cutting off the engine power. The guide rail mechanism 27 'can change its posture between a closed posture in which it approaches the conveyor chain 7' to guide the grain stalks conveyed by the conveyor chain 7 'from above and an open posture in which it is separated upward from the conveyor chain 7'.

Therefore, the first state of the grain stalk conveyor unit CU ' is a state in which the conveyor chain clutch 53 ' is switched to the power transmission position and a state in which the guide rail mechanism 27 ' is changed to the closed posture. Of course, in the frame of the present invention, any one of the state where the conveyor chain clutch 53 ' is in the power transmission position and the state where the guide rail mechanism 27 ' is in the closed posture may be used as the first state of the straw conveying device CU '. The second state of the straw conveying device CU ' is a state in which the conveyor chain clutch 53 ' is switched to the power cut-off position, and a state in which the guide rail mechanism 27 ' is changed to the open posture. Here, in the frame of the present invention, any one of a state in which the conveyor chain clutch 53 ' is at the power cut-off position or a state in which the guide rail mechanism 27 ' is in the open posture may be used as the second state of the straw conveying apparatus CU '. In the example of fig. 15, the first state and the second state of the grain stalk conveyor unit CU ' are set to the two states of the conveyor chain clutch 53 ' and the two states of the guide rail mechanism 27 '.

A rail motor 119 ' (denoted by M1 ' in fig. 15) and a clutch motor 81 ' (denoted by M2 ' in fig. 15) are included in the electric motor unit MU '. In order to move from the closed posture to the open posture of the rail mechanism 27 ', rotation exceeding a predetermined rotation angle from the home position (the motor start standby position) of the rail motor 119' is used. In order to move from the power transmission position to the power cutoff position of the conveyor chain clutch 53 ', rotation exceeding a predetermined rotation angle from the home position of the clutch motor 81' is used. Further, a rotation detector 119A ' (indicated by S1 ' in fig. 15) for detecting the rotation of the rail motor 119 ' is provided. A rotation detector 83 ' (denoted by S2 ' in fig. 15) for detecting rotation of the clutch motor 81 ' is also provided.

The control system of fig. 15 includes an input signal processing unit 210 ', an engine control unit 201 ', and a motor control unit 204 '. The input signal processing unit 210 'is an input interface for inputting various detection signals from the sensor/switch group SW' and rotation angle signals from the rotation detectors 119A 'and 83' to perform necessary processing and outputting the signals to the respective functional units of the control system. The engine control unit 201 ' transmits a control signal to the engine E ' to control the operation of the engine E '. The motor control unit 204 'transmits a control signal to the electric motor unit MU' to control the operation of the motors 119 'and 81'.

The control system further includes an engine drive management unit 220 ', a motor drive management unit 230 ', and an abnormality determination unit 240 '. The motor drive management unit 230 'includes a minute rotation command unit 231'. The minute rotation command unit 231 'outputs a minute rotation command to the track motor 119' and the clutch motor 81 'included in the electric motor unit MU'. The minute rotation command to the track motor 119 'is a command to rotate the track motor 119' by a minute rotation angle that is much smaller than a predetermined rotation angle from the home position of the track motor 119 'required to move the track mechanism 27' from the closed position to the open position. The minute rotation command to be output to the clutch motor 81 'is a command to rotate the clutch motor 81' by a minute rotation angle that is much smaller than a predetermined rotation angle from the home position of the clutch motor 81 'required for moving from the power transmission position to the power cutoff position of the conveyor chain clutch 53'.

The abnormality determination unit 240 ' determines that an abnormality has occurred when the corresponding rotation detectors 119A ' and 83 ' detect the minute rotation of the rail motor 119 ' or the clutch motor 81 ' or both of them included in the electric motor unit MU ' regardless of the minute rotation command output from the minute rotation command unit 231 '. The abnormality includes disconnection or connection failure of a signal line, a control line, or a power line, failure of the rail motor 119 'or the clutch motor 81', failure of another operating device, or the like.

If the minute rotations of the rail motor 119 'and the clutch motor 81' are integrated for the above-described abnormality check, the state change will eventually occur. To avoid this, when the minute rotation of the corresponding motor to be outputted as the minute rotation command is detected, the minute rotation command unit 231' further outputs a command for reversing the corresponding motor to cancel the minute rotation.

When the abnormality determination unit 240 'determines that an abnormality has occurred, the engine drive management unit 220' outputs a command for prohibiting the drive of the engine E 'to the engine control unit 201'. More specifically, when it is determined that an abnormality has occurred in the initial check process before the engine is started by the key switch KSW, the minute rotation command unit 231 'executes the minute rotation, and then a start prohibition command for prohibiting the start of the engine E' is output. When the minute rotation is executed by the minute rotation command unit 231 'during the engine driving, if it is determined that an abnormality occurs, a stop command for stopping the driving of the engine E' is output.

Since the combine cannot harvest the grain stalks planted at the corners of the farmland, the operator manually harvests the grain stalks. The threshing device 4 ' of the stopped combine is driven, and the grain stalks previously harvested by the manual operation are placed on the conveyor chain 7 ' and fed into the threshing device 4 ' to be threshed. The threshing work involving such manual work is referred to as manual threshing work. A manual threshing straw feeding unit FT 'for manually feeding the straws to the conveyor chain 7' during the manual threshing operation is formed in a region between the harvesting unit 1 'and the threshing device 4'.

Next, one of embodiments of the combine harvester of the present invention will be described with reference to the drawings.

Fig. 16 shows a half-feed type combine as an example of a combine for harvesting crops such as rice and wheat. The front part of the combine harvester is provided with a harvesting part 1' for harvesting and planting the grain stalks. A crawler-type traveling device 2 'capable of traveling is provided behind the harvesting unit 1'. A body frame 3 'is provided above the traveling device 2'.

A threshing device 4 'for threshing the reaped grain stalks is arranged on the left side of the machine body frame 3'. A row rod cutting device 5 'for cutting the row rods is arranged behind the threshing device 4'. A conveying chain 7 ' for conveying the harvested straws to the threshing device 4 ' is arranged at the left side of the threshing device 4 '.

The right front portion of the body frame 3 ' is provided with an operation portion 6 ' and an engine E '. A grain collecting box 8 'for storing grains is arranged at the right rear part of the machine body frame 3'. The grain collecting box 8 ' is provided with a grain unloading device 9 ' for taking out grains in the grain collecting box 8 '.

Through the structure, the combine harvester utilizes the traveling device 2 ' to travel, utilizes the harvesting part 1 ' to harvest and plant the grain stalks, utilizes the conveying chain 7 ' to convey the harvested grain stalks to the threshing device 4 ', and utilizes the threshing device 4 ' to thresh the harvested grain stalks. After threshing the harvested grain stalks with the threshing device 4 ', the grains are stored in the grain collecting box 8'. The utility model can also be discharged directly to the farmland, but can also be cut by the utility model 5' and discharged to the farmland.

As shown in fig. 17 and 18, a threshing chamber 10 'is formed at the upper part of the threshing device 4'. The threshing chamber 10 'is provided with a threshing cylinder 11' for threshing processing so as to be rotatable about a threshing cylinder axis Y1 'in the front-rear direction (in the direction of arrow R1' shown in fig. 18). The threshing cylinder 11 'has a plurality of threshing teeth 12'. A screen 13 'for allowing a processed product (threshed processed product) obtained by the threshing process to leak is provided below the threshing cylinder 11'.

The left side of the threshing chamber 10 'is provided with a conveying chain 7' which clamps and conveys the reaped grain stalks along a threshing opening 10a 'of the threshing chamber 10'. A guide rail mechanism 27 ' for holding the harvested straw together with the conveyor chain 7 ' is provided at a position opposite to the conveyor chain 7 ' in the up-down direction. A dust exhaust fan 14 'for exhausting dust to the outside and a bar chain 15' for conveying bars to the bar cutting device 5 'are provided behind the threshing chamber 10'.

The lower part of the threshing device 4 ' is provided with a swing screening device 16 ' for swing screening, a main cleaning fan 17 ' for air cleaning, an auxiliary cleaning fan 18 ' and a secondary cleaning fan 19 '. A primary recovery unit 20 ' and a secondary recovery unit 21 ' are provided behind the main cleaning fan 17 ' in this order from the front.

The primary recovery unit 20' recovers grains of the primary treatment product. The primary recovery unit 20 'is provided with a primary transverse auger 22' for conveying grains of the primary treatment product in the left-right direction. A winnowing device 23 ' for winnowing the grains of the primary treatment object and conveying the grains to the grain collecting box 8 ' is connected with the primary recovery part 20 '.

The secondary recovery unit 21' recovers grains of the secondary treatment product. The secondary recovery unit 21 'is provided with a secondary transverse auger 22 a' for conveying grains of the secondary processed material in the left-right direction. A secondary recovery unit 21 ' is connected to a secondary reduction device 21a ' for reducing grains of the secondary processed product to the swing sifter 16 '.

With the above structure, in the threshing device 4 ', while the harvested grain stalks are gripped and conveyed by the conveying chain 7', the threshing treatment is performed by the threshing cylinder 11 ', and the threshed treatment object leaks from the screen 13'. For the threshed objects that have leaked from the screen 13 ', swing screening is performed by the swing screening device 16 ', and wind cleaning is performed by the main cleaning fan 17 ', the sub cleaning fan 18 ', and the secondary cleaning fan 19 '. Thus, the grain of large specific gravity is collected as a primary processed product by the front primary collection unit 20 ', and winnowed by the winnowing device 23 ' and conveyed to the grain collection box 8 '. The grain with branches having a low specific gravity is collected as a secondary processed product by the rear secondary collection unit 21 ' and is reduced to the swing sifter 16 ' by the secondary reducing device 21a '.

Next, the rail mechanism 27' will be described with reference to fig. 17, 18, and 19.

As shown in fig. 17 and 18, the guide rail mechanism 27 ' holds the reaping straw together with the conveyor chain 7 ' at a position facing the conveyor chain 7 ' in the vertical direction. The rail mechanism 27 'is configured to be vertically swingable about a lateral axis X4'. The rail mechanism 27 'is urged by a damper 100' (corresponding to the "urging mechanism" of the present invention) so as to swing upward. The rail mechanism 27 ' is configured to be positionable by the positioning mechanism 98 ' at a position facing the conveyor chain 7 ' in the vertical direction. When the positioning mechanism 98 'is released from the positioning, the rail mechanism 27' is configured to swing upward to a position where the threshing opening 10a 'is opened by the damper 100'.

The rail mechanism 27 ' includes a rail 101 ' and a rail frame 102 '. The guide rail 101 'holds the harvested straw together with the conveyor chain 7'. The guide rail 101 ' is configured to extend along the upper conveying path of the conveyor chain 7 ' at a position facing the conveyor chain 7 ' in the vertical direction. The guide rail 101 ' is formed to have a length at least over the entire length of the threshing cylinder 11 ' in the direction of the axial center Y1 '.

The rail frame 102 'supports the rail 101'. Specifically, the rail frame 102 ' elastically supports the rail 101 ' via a plurality of springs 103 '.

In detail, a plurality of ducts 104 ' are installed in the vertical direction at predetermined intervals in the longitudinal direction of the rail frame 102 ' on the rail frame 102 '. A plurality of rods 106 'inserted into the duct 104' are attached to the guide rail 101 'in the vertical direction at predetermined intervals in the longitudinal direction of the guide rail 101'. A spring 103 'is fitted around the rod 106'. An upper spring receiving portion 105 ' that receives an upper end portion of the spring 103 ' is fixed to the pipe 104 '. A lower spring receiving portion (not shown) that receives a lower end portion of the spring 103 'is fixed to the rod 106'. In this way, the rail frame 102 ' elastically supports the rail 101 ' via the plurality of springs 103 '.

The rail frame 102 ' is supported by an upper side wall 4A ' forming a side portion of the threshing chamber 10 ' so as to be swingable up and down. Specifically, the rail frame 102 'is configured to be vertically swingable about the lateral axis X4' at a rear fulcrum. A swing shaft 108 ' for vertically swingably supporting the rear end of the rail frame 102 ' is provided on the upper sidewall 4A '. The rail frame 102 ' is configured to be vertically swingable integrally with a lateral exterior cover 109 ' covering the upper sidewall body 4A '. The rail frame 102 ' is attached to the inner surface side of the lateral exterior cover 109 ' via a mounting frame 110 '.

Shock absorber 100' is a gas spring-type shock absorber. The shock absorber 100 'includes a cylinder 111' and a rod 112 'telescopically inserted into the cylinder 111'. An end of the cylinder 111 ' is swingably attached to a pin 113 ' provided on the upper sidewall body 4A '. The end of the rod 112 'is swingably attached to the rail frame 102'. Specifically, the end of the rod 112 ' is swingably attached to a mounting bracket 114 ' fixed to the upper surface of the rail frame 102 '.

As shown in fig. 18 and 19, the positioning mechanism 98 ' includes a positioning lever 115 ' and a click roller 116 '.

The positioning operation lever 115 ' is provided on the upper sidewall 4A ' and is configured to be swingable about a lever axis Z1 ' in the up-down direction. The positioning operation lever 115 ' is driven to swing by a rail motor 119 ' constituting the electric motor unit MU '. The positioning operation lever 115 ' includes a lever main body 115A ' and a handle portion 115B '.

The lever main body 115A 'is supported by the support plate 117' so as to be able to swing. The lever main body 115A' is constituted by a plate-like member. The lever main body 115A ' is configured to be engageable with an engagement roller 116 ' provided on the rail frame 102 '.

The handle portion 115B 'is coupled to the lever main body 115A'. Specifically, the handle 115B ' is connected to the lever main body 115A ' in a state of intersecting the lever main body 115A ' at a predetermined inclination angle in plan view. The predetermined inclination angle is set such that the handle portion 115B 'is parallel or substantially parallel to the axis Y1' direction of the threshing cylinder 11 'in a state where the positioning mechanism 98' positions the rail mechanism 27 'to face the conveyor chain 7' in the vertical direction.

The handle portion 115B ' is configured as a clip-in type (clip-on type) fixing member 123 ' that can be sandwiched between the inner surfaces of the lateral exterior cover 109 '. Handle portion 115B ' protrudes forward from lateral exterior cover 109 ' covering upper sidewall 4A '. Thus, the handle portion 115B 'is preferably a hand-held portion when the positioning operation lever 115' is configured to be manually operable.

As shown in fig. 18, a protrusion 117a ' that supports the lever main body 115A ' so as to be able to swing is formed on the support plate 117 '. The support plate 117 ' is fixed to the front end of the upper sidewall body 4A ' by a bolt 118 '. The support plate 117 ' has a bolt hole 117b ' through which a bolt 118 ' is inserted and which is long in the vertical direction. This enables the vertical position of the positioning lever 115 'to be adjusted by adjusting the support plate 117'.

As shown in fig. 18 and 19, the rail motor 119 ' is mounted to the front surface of the front wall 4B ' forming the front part of the threshing chamber 10 '. The rail motor 119 'is driven by operating a rail opening operation switch SW 1' (see fig. 28). The rail motor 119 'has an output shaft 119 a' in the front-rear direction. A swing arm 120 ' is connected to an output shaft 119a ' of the rail motor 119 '. The swing arm 120 ' is connected to the lever main body 115A ' via a link 121 '. A potentiometer 119A ' is provided on the output shaft 119A ', and the potentiometer 119A ' serves as a rotation detector for detecting a rotation angle of the output shaft 119A ', in other words, a rotation angle of the rail motor 119 '.

The engaging roller 116 'can engage with the lever main body 115A'. The engaging roller 116 'is provided in the rail mechanism 27'. Specifically, the engagement roller 116 ' is supported at the front end of the rail frame 102 ' so as to be rotatable about a roller axial center Y4 ' in the front-rear direction.

With the above-described structure, the guide rail mechanism 27 'is positioned at a position facing the conveyor chain 7' in the vertical direction by the stopper effect of the engagement of the lever main body 115A 'with the engagement roller 116'. At this time, handle portion 115B 'is held by fixture 123'.

When the guide opening operation switch SW1 ' is operated in a state where the guide mechanism 27 ' is positioned to face the conveyor chain 7 ' in the vertical direction, the swing arm 120 ' connected to the output shaft 119a ' of the guide motor 119 ' swings (in the direction of arrow R2 ' shown in fig. 18). Then, the positioning operation lever 115 ' is pulled toward the swing arm 120 ' via the link 121 ' and swings around the lever axial center Z1 ' in the vertical direction (the direction of arrow R3 ' shown in fig. 19). The positioning lever 115 ' is restricted from swinging in the direction of arrow R3 ' by abutting against the abutting piece 122 '. Thus, when the engagement between the lever main body 115A ' and the engagement roller 116 ' is released (lock release), in other words, when the positioning of the positioning mechanism 98 ' is released, the rail frame 102 ' swings upward by the damper 100 ' to a position where the threshing opening 10a ' is opened, and the rail mechanism 27 ' is opened. (refer to fig. 17).

As shown in fig. 17, a rail open detection switch 150 'is provided on the body-side member in a region close to the base end side of the rail frame 102'. The rail open detection switch 150 'has a switch lever 151' that swings about a horizontal axis, and is turned ON at an upper swing position and turned OFF at a lower swing position. In addition, a substantially J-shaped arm 160 ' extending downward on the rod inner side surface of the rail frame 102 ' and further protruding in the lateral direction is fixed to a region corresponding to the rail open detection switch 150 '. The protruding portion of the arm 160 'is located below the switch lever 151'. When the rail frame 102 'swings upward, the protruding portion of the arm 160' pushes up the switch lever 151 'to the upper swing position, thereby switching the state of the rail open detection switch 150'. In other words, the open-rail detection switch 150 ' is normally closed, and is in an energized state in the closed posture of the rail mechanism 27 ', and is in a non-energized state in the open posture of the rail mechanism 27 '.

As shown in fig. 20, a transmission device 50 ' for transmitting power to the conveyor chain 7 ' is provided at the rear of the threshing device 4 '. The power of the output shaft 52 ' of the transmission 50 ' is made to surround the conveyor chain 7 '. The transmission device 50 'includes a transmission chain clutch 53' for selectively transmitting and blocking the power. The structure of the conveyor chain clutch 53' will be described in detail later.

As shown in fig. 21, the power of the output shaft Ea ' of the engine E ' is transmitted to the input shaft Ma ' of the transmission M ' via a belt B1 '. The power of the output shaft Mb ' of the transmission M ' is transmitted to the harvesting input shaft 1a ' of the harvesting unit 1 ' via the belt B2 '. A harvesting clutch (for example, a belt-tension clutch) that can be switched between a state in which power is transmitted to the harvesting unit 1 ' and a state in which power transmitted to the harvesting unit 1 ' is cut off is provided on a path through which power is transmitted to the harvesting input shaft 1a '.

The power of the output shaft Ea 'of the engine E' is transmitted to the counter shaft 25 'via the belt B3'. A clutch 31 'called a threshing clutch is interposed between the belt B3'. The power of the auxiliary shaft 25 'is transmitted to the threshing cylinder 11', the main cleaning fan 17 'and the primary transverse auger 22'.

In detail, the power of the counter shaft 25 'is transmitted to the threshing cylinder 11' through the branch shaft 26 'and the belt B4'. The power of the secondary shaft 25 ' is transmitted to the main cleaning fan 17 ' via a belt B5 '. The power of the secondary shaft 25 ' is transmitted to the primary transverse auger 22 ' via belt B6 '.

The power of the primary transverse conveyer 22 ' is transmitted to the secondary transverse conveyer 22a ', the input shaft 16a ' of the swing screen device 16 ' and the input shaft 51 ' of the transmission device 50 ' via the belt B7 '. The power of the input shaft 51 'of the transmission device 50' is transmitted to the input shaft 14a 'of the dust exhaust fan 14'. The power of the input shaft 51 'of the transmission device 50' is transmitted to the gang bar cut-off device 5 'via the belt B8'.

Next, the conveyor chain clutch 53' will be described with reference to fig. 22 to 27.

As shown in fig. 22 and 23, the conveyor chain clutch 53 ' is configured to be switchable between a transmission state in which power is transmitted to the conveyor chain 7 ' and a blocking state in which power transmitted to the conveyor chain 7 ' is blocked. The transmission chain clutch 53 'has an output gear 54' and a transmission cylinder 55 'that are opposed to each other and can be engaged with each other on the output shaft 52'.

The output gear 54 'is provided on the output shaft 52' so as to be relatively rotatable. The power of the input gear 56 ' is transmitted to the output gear 54 ' via the first relay gear 57 ', the second relay gear 58 ', and the third relay gear 59 '. The power of the output gear 54 ' is transmitted to the output shaft 52 ' via the transmission drum 55 '. A claw portion 54a ' for engaging with the transmission cylinder 55 ' (claw portion 55a ') is formed on a surface (left side surface) of the output gear 54 ' on the side facing the transmission cylinder 55 '.

The transmission cylinder 55 ' is provided on the output shaft 52 ' so as to be integrally rotatable and movable in the axial direction (left-right direction) of the output shaft 52 '. In other words, the transmission cylinder 55 'is spline-fitted to the output shaft 52'. Further, the transmission cylinder 55 ' is urged by a spring 60 ' so as to move toward the output gear 54 ' (right side). A claw portion 55a ' for engaging with the output gear 54 ' (claw portion 54a ') is formed on a surface (right side surface) of the transmission cylinder 55 ' on the side opposite to the output gear 54 '. A flange portion 55A ' having a substantially circular shape when viewed in the axial direction of the output shaft 52 ' (side view) is formed at the left end portion of the transmission cylinder 55 '.

A first vertical surface 55b ', a second vertical surface 55c ', and an inclined surface 55d ' are formed on a surface (right surface) of the flange portion 55A ' on the side facing the output gear 54 ' (see fig. 24). The first vertical surface 55b ' and the second vertical surface 55c ' are formed perpendicular to the output shaft 52 '. The first vertical surface 55b 'and the second vertical surface 55 c' are formed in a step shape. The second vertical surface 55c 'is located on the side (right side) of the output gear 54' with respect to the first vertical surface 55b 'in the axial direction (left-right direction) of the output shaft 52'. The inclined surface 55d 'is formed around the axial direction of the output shaft 52' on the outer peripheral portion of the first vertical surface 55b 'and the outer peripheral portion of the second vertical surface 55 c'. The inclined surface 55 d' is formed to have a prescribed cam profile.

As shown in fig. 25, 26, and 27, the operating member 40 ' is configured to be switchable between an on position corresponding to the transmission state of the conveyor chain clutch 53 ' and an off position corresponding to the off state of the conveyor chain clutch 53 '. The operating member 40 'switches the operation of the conveyor chain clutch 53' to the cut-off state by switching to the off position. In other words, the operating member 40 'moves the transmission cylinder 55' to the engagement releasing side by switching to the off position. The operation member 40 ' includes a swinging piece 41 ' and a shaft body 42 '.

The swing piece 41 'is configured to be swingable between the on position and the off position around a swing axis X4' in the left-right direction. The swing piece 41 'is urged by a spring 45' so as to swing toward the on position side. The swing piece 41 'is supported on the left side portion of the transmission case 50A' of the transmission device 50 'via the swing shaft 43' in the left-right direction. The swing piece 41 ' is provided with a first swing arm 41a ' and a second swing arm 41b '. A spring 45 ' is coupled to the second swing arm portion 41b ' of the swing piece 41 '.

The shaft body 42 ' is connected to the first swing arm portion 41a ' via a connecting pin 44 ' in the left-right direction. The shaft body 42 ' is configured to be able to contact with and separate from the transmission cylinder 55 ' in a direction perpendicular to the output shaft 52 '. The shaft body 42 ' is supported by the transmission case 50A ' of the transmission device 50 ' so as to be movable in the vertical direction. The swinging piece 41 ' swings toward the off position, and the shaft body 42 ' comes into contact with the transmission cylinder 55 ' so as to apply a moving force to the engagement releasing side (left side).

The operation of the conveyor chain clutch 53' will be described with reference to fig. 24.

As shown in fig. 24(a), in a state where the shaft body 42 'is in contact with the first vertical surface 55 b', the transmission cylinder 55 'does not move in the axial direction (left-right direction) of the output shaft 52' even if it rotates. In other words, the conveyor chain clutch 53' is maintained in the transmitting state.

Next, as shown in fig. 24(b), in a state where the shaft body 42 'is in contact with the inclined surface 55 d', the transmission cylinder 55 'is gradually moved to the engagement releasing side (left side) in accordance with the rotation of the transmission cylinder 55'. In other words, the conveyor chain clutch 53' moves from the transmitting state to the cut-off state.

Finally, as shown in fig. 24 c, in a state where the shaft body 42 'is in contact with the second vertical surface 55 c', the transmission cylinder 55 'does not move in the axial direction (left-right direction) of the output shaft 52' even if it rotates. In other words, the conveyor chain clutch 53' is maintained in the disengaged state. Thereafter, the swinging piece 41 ' swings to the on position side, and the shaft body 42 ' is separated from the transmission cylinder 55 '. Thereby, the transmission cylinder 55 'moves toward the output gear 54' (the right side) by the biasing force of the spring 60 ', and the transmission chain clutch 53' is switched to the transmission state.

As shown in fig. 25, 26, and 27, the position holding mechanism 70 'holds the position of the operating member 40' at the on position. The position holding mechanism 70 ' is configured to be connectable to the operating member 40 ' via a connecting rod 61 ' (corresponding to a "connecting member" of the present invention). The position holding mechanism 70 ' has a first holding arm 71 ' coupled to the operating member 40 ' side and a second holding arm 72 ' coupled to the releasing mechanism 80 ' side. In the left-right direction of the body, a first holding arm 71 'and a second holding arm 72' are arranged in this order from the inner side (right side) of the body lateral. The first holding arm 71 'and the second holding arm 72' are coupled to each other so as to be capable of relative swinging, and have portions that abut against each other so as to prevent relative swinging.

A projection 71a 'is provided at one end of the first holding arm 71'. The projection 71a ' of the first holding arm 71 ' is connected to the connecting shaft 61a ' of the connecting rod 61 ' so as to be swingable about the first swing shaft center X1 '. In a state where the coupling shaft 61a ' of the connecting rod 61 ' is inserted into the projection 71a ' of the first holding arm 71 ', the first holding arm 71 ' and the connecting rod 61 ' are fixed by the bolt 73 ' so as to be prevented from coming off.

A projection 71b 'is provided at the other end of the first holding arm 71'. The projection 71b ' of the first holding arm 71 ' is connected to the connecting shaft 72a ' of the second holding arm 72 ' so as to be swingable about the second swing axis X2 '. In a state where the coupling shaft 72a ' of the second holding arm 72 ' is inserted into the projection 71b ' of the first holding arm 71 ', the first holding arm 71 ' and the second holding arm 72 ' are fixed by the bolt 74 ' so as to be prevented from coming off.

A first contact portion 71c ' which is a portion capable of coming into contact with the second holding arm 72 ' is formed at the other end portion of the first holding arm 71 '. The first abutment portion 71c 'is integrally formed with the first holding arm 71'. The first contact portion 71c 'is formed such that a single portion protrudes toward the other side with the protrusion portion 71 b' (the second swing axis X2 ') at the other end portion of the first holding arm 71'.

A projection 72b 'is provided at the other end of the second holding arm 72'. The protrusion 72b 'of the second holding arm 72' is supported by the swinging shaft 75 'so as to be swingable around the third swing axis X3'. In a state where the swing shaft 75 'is inserted into the protrusion 72 b' of the second holding arm 72 ', the second holding arm 72' and the swing shaft 75 'are fixed by the bolt 76' so as to be prevented from slipping off. A handle 77 'and an operation piece 78' are connected to the projection 72b 'of the second holding arm 72' so as to be integrally rotatable.

The second holding arm 72 ' is provided with a second contact portion 72c ' which is a portion capable of coming into contact with the first contact portion 71c '. The second abutting portion 72c 'is constituted by a member (plate-like member) different from the second holding arm 72'. The second contact portion 72c ' is fixed to a surface of the second holding arm 72 ' on the inner side (right side) of the body in a state substantially perpendicular to the second holding arm 72 '. The second contact portion 72c ' is arranged obliquely with respect to a line connecting the second swing axis X2 ' and the third swing axis X3 ' in side view. In other words, the second contact portion 72c 'is inclined such that one end portion is positioned on one side with the second pivot axis X2' therebetween in a side view.

The swing shaft 75 'is fixed to the left side wall of the threshing device 4' via a fixing plate 75a 'by a bolt 79'. The swing shaft 75 'and the projection 72B' of the second holding arm 72 'project laterally outward (leftward) of the machine body from the left inner cover 4C' covering the left side wall of the threshing device 4 'inside the left outer cover 4B'. A handle 77 'is connected to the protrusion 72 b' of the second holding arm 72 'outside the left inner cover 4C' so as to be integrally rotatable.

The connecting rod 61 ' is configured to be able to connect the operating member 40 ' to the position maintaining mechanism 70 '. The link 61 ' is disposed laterally outward (leftward) of the body with respect to the swing piece 41 ' and the first holding arm 71 '. The link 61 'is configured to be swingable about a swing axis X4' in the left-right direction. The link lever 61 ' is urged by a spring 63 ' to swing clockwise about a swing shaft center X4 ' in a left side view. The connecting rod 61 ' has a connecting rod main body 61A ' and a connecting piece 61B '.

A connecting piece 61B 'is fixed to one end of the connecting rod body 61A'. A spring 63 'is coupled to an end (connecting piece 61B') of the connecting rod 61 'on the operating member 40' side. The connecting piece 61B ' is provided with a first connecting arm portion 61B ' and a second connecting arm portion 61c '. The left side surface of the first link arm 61b 'is fixed to one end of the link main body 61A'. A spring 63 'is connected to the second connecting arm portion 61 c'.

The link piece 61B 'is supported on the left side portion of the transmission case 50A' of the transmission device 50 'via the swing shaft 43' in the left-right direction. In other words, the connecting rod 61 ' is supported on the same swing shaft 43 ' as the operating member 40 '. Further, a left-right direction operation pin 64 '(corresponding to an "operation portion" of the present invention) is provided in the connection piece 61B' so as to protrude toward the inner side (right side) of the machine body in the lateral direction. The action pin 64 'is configured to be able to apply a swinging force toward the off position to the swinging piece 41'. The action pin 64 ' is configured to be able to abut against the rear surface of the second swing arm portion 41b ' of the swing piece 41 '.

As shown in fig. 25, the release mechanism 80 ' releases the position holding of the operating member 40 ' to the on position by the position holding mechanism 70 ' by swinging the second holding arm 72 ' to the side of releasing the contact with the first holding arm 71 '. The release mechanism 80 ' has a wire harness 82 ', a clutch motor 81 ', and a potentiometer 83 ' as a rotation detector for detecting a rotation angle of the clutch motor 81 '. The clutch motor 81 ' and the potentiometer 83 ' are connected to the control device 200 ' (see fig. 28). The clutch motor 81 ' and the potentiometer 83 ' are mounted to the mounting plate 84 '.

The clutch motor 81 'is operated to swing the second holding arm 72' to the side of releasing the contact with the first holding arm 71 'via the wire harness 82'. The clutch motor 81 'is driven and operated by a clutch switch SW 2' (see fig. 28). The clutch motor 81 'is attached to the attachment plate 84' from the inner lateral side (right side) of the machine body. The clutch motor 81 'has a motor shaft 81 a' in the left-right direction. The motor shaft 81a 'protrudes laterally outward (leftward) from the mounting plate 84'. A first motor arm 90 ' and a second motor arm 91 ' are connected to the motor shaft 81a ' so as to be integrally rotatable.

The wire harness 82 'is coupled to the second holding arm 72' side. The harness 82 ' has an inner harness 82a ' and an outer harness 82b '. Both end portions of the outer wire harness 82B ' are supported by harness brackets 93A ', 93B '. One end of the inner harness 82a 'is connected to the operation piece 78'. The other end of the inner harness 82a 'is coupled to the first motor arm 90'.

Whether or not the second motor arm 91 ' is located at the initial position P0 ' can be determined based on the swing angle of the second motor arm 91 ' detected by the potentiometer 83 ' serving as a rotation detector of the clutch motor 81 '. The potentiometer 83 'is attached to the attachment plate 84' from the lateral inner side (right side) of the body. The potentiometer 83 'has a potential axis 83 a'. The potential shaft 83a 'projects laterally outward (leftward) from the mounting plate 84'. A potential arm 92 'is connected to the potential shaft 83 a' so as to be integrally rotatable. The potential arm 92 ' is provided with a contact portion 92a ' that contacts the second motor arm 91 '.

The attachment plate 84 ' has a cutout portion 84a ' into which the clutch motor 81 ' enters and a cutout portion 84b ' into which the potentiometer 83 ' enters. The mounting plate 84 ' is supported by a front support leg 86 ' and a pair of upper and lower rear support legs 85 '.

As shown in fig. 25, the first holding arm 71 'abuts against the second holding arm 72' to prevent relative swinging, and the position of the operating member 40 'is held at the on position by the position holding mechanism 70'. As described above, the link lever 61 'is biased by the spring 63' to swing clockwise about the swing axis X4 'in the left side view, and the first holding arm 71' is also biased to swing to the side in contact with the second holding arm 72 '(clockwise about the second swing axis X2' in the left side view). In other words, the state in which the first abutting portion 71c ' of the first holding arm 71 ' abuts against the second abutting portion 72c ' of the second holding arm 72 ' is held by the urging force of the spring 63 '.

Here, in a state where the first contact portion 71c 'of the first holding arm 71' is in contact with the second contact portion 72c 'of the second holding arm 72', the link lever 61 'does not swing clockwise about the swing axial center X4' in a left side view. In other words, in a state where the first abutting portion 71c ' of the first holding arm 71 ' abuts against the second abutting portion 72c ' of the second holding arm 72 ', in other words, in a state where the position holding mechanism 70 ' holds the position of the operating member 40 ' at the on position, the connecting rod 61 ' does not transmit the urging force of the spring 63 ' to the operating member 40 '. Therefore, in a state where the position holding mechanism 70 'holds the position of the operating member 40' at the on position, the acting pin 64 'does not apply the swinging force toward the off position to the swinging piece 41'.

As shown in fig. 27, when the release mechanism 80 ' is operated, the position holding mechanism 70 ' releases the position holding of the operation member 40 ' to the on position. Specifically, when the clutch motor 81 'is driven by the clutch switch SW 2' (see fig. 28), the first motor arm 90 'swings counterclockwise about the motor shaft 81 a' when viewed from the left side. Then, the second holding arm 72 'swings clockwise about the third swing axis X3' via the harness 82 'and the operation piece 78' in the left side view. Thereby, the abutment between the first abutment portion 71c 'of the first holding arm 71' and the second abutment portion 72c 'of the second holding arm 72' is released. In other words, the second holding arm 72 ' is operated by the clutch motor 81 ' to swing to the side of releasing the contact with the first holding arm 71 ' (clockwise about the third swing axial center X3 ' in the left side view) via the wire harness 82 '.

Here, when the second holding arm 72 ' swings to the side of releasing the contact with the first holding arm 71 ' (clockwise around the third swing axis X3 ' in left side view), the state where the link lever 61 ' does not transmit the urging force of the spring 63 ' to the operating member 40 ' is switched to the state where the urging force of the spring 63 ' is transmitted to the operating member 40 ' at a position (dead point) where a line connecting the first swing axis X1 ', the second swing axis X2 ', and the third swing axis X3 ' becomes a straight line in side view. In other words, the spring 63 ' has a function as an urging force for bringing the first contact portion 71c ' of the first holding arm 71 ' into contact with the second contact portion 72c ' of the second holding arm 72 ', and a function as an urging force for swinging the swinging piece 41 ' toward the off position (switching the operating member 40 ' to the off position), and the two functions are switched with the dead point as a boundary.

Then, in the left side view, the link lever 61 ' swings clockwise around the swing axis X4 ' by the biasing force of the spring 63 ', the action pin 64 ' abuts on the rear surface of the swing piece 41 ' (the second swing arm portion 41b '), and the swing force toward the off position side is applied to the swing piece 41 '. The swinging piece 41 'swings to the off position side, and the conveyor chain clutch 53' is switched to the off state.

Further, when the handle 77 ' is manually swung clockwise about the third swing axis X3 ' in the left side view, the contact between the first contact portion 71c ' of the first holding arm 71 ' and the second contact portion 72c ' of the second holding arm 72 ' can be released, and the position holding of the operating member 40 ' to the on position can be released.

Here, in the state where the operating member 40 'is switched to the off position, the wire harness 82' is loosened. Therefore, the handle 77 'can be manually swung counterclockwise about the third swing shaft center X3' to return to the original position when viewed from the left. In other words, when the handle 77 ' is manually swung counterclockwise about the third swing axis X3 ' in the left side view, the first contact portion 71c ' of the first holding arm 71 ' and the second contact portion 72c ' of the second holding arm 72 ' can be brought into contact with each other, and the position of the operating member 40 ' can be held at the on position.

Fig. 28 shows various functional blocks for explaining control functions related to posture change control of the rail mechanism 27 ' and on/off control of the conveyor chain clutch 53 ' in the control device 200 ' mounted on the combine. The control device 200 'includes an engine control unit 201', a device control unit 203 ', a motor control unit 204', an input signal processing unit 210 ', and a control unit 200A' as functions particularly relevant to the present invention, and the respective function units are connected to each other by an in-vehicle LAN or other data transmission lines.

The engine control unit 201 ' transmits a control signal to the engine E ' to perform start/stop, drive/stop, adjustment of the engine speed, and the like of the engine E '. The motor control unit 204 'transmits a control signal to the electric motor unit MU' to control the operations of the rail motor 119 'and the clutch motor 81'. The device control unit 203 ' applies a control signal to the engine E ', hydraulic devices other than the electric motor unit MU ', and electric devices to perform a desired operation. The device control unit 203 'and the electric motor unit MU' may be combined.

The input signal processing unit 210 'functions as an input interface of the control device 200', receives signals from various devices such as the sensor/switch group SW ', performs signal processing according to the necessity, and transmits the signals to the functional units of the control device 200'. For convenience of explanation, the clutch switch SW2 ', the rail open operation switch SW1 ', the key switch KSW ', the potentiometer 83 ', the rail open detection switch 150 ', and the potentiometer 119A ' are shown separately for the sensor/switch group SW '. The clutch switch SW2 'detects the on position or the clutch off position of the clutch 31'. The rail open operation switch SW1 'is a switch for moving the rail mechanism 27' to the open posture. The key switch KSW' has at least a first operating position and a second operating position that are sequentially shifted from the OFF position. In the first operating position, power is supplied to each functional unit included in the control system, and the functional unit is activated. In the second operating position, the starter motor is started and the engine E' is started. The potentiometer 83 ' functions as a rotation detector for operating the clutch motor 81 ' of the conveyor chain clutch 53 '. The potentiometer 119A 'functions as a rotation detector for detecting the rotation angle of the rail motor 119'. The rail open detection switch 150 'detects that the rail mechanism 27' is in the open position.

In the control unit 200A ', an engine drive management unit 220', a motor drive management unit 230 ', an abnormality determination unit 240', a guide rail posture control unit 250 ', and a guide rail posture detection unit 260' are created as functional units that realize their functions mainly by executing programs.

The rail posture detecting unit 260 ' detects the open posture of the rail mechanism 27 ' based on the detection signal from the rail open operation switch SW1 '. The rail posture control unit 250 'gives a command to the motor control unit 204' to bring the rail mechanism 27 'into the open posture, based on a signal from the rail opening operation switch SW 1' operated by the operator. Thereby, the motor control unit 204 ' rotates the rail motor 119 ' to move the rail mechanism 27 ' from the closed posture to the open posture.

The minute rotation command unit 231 'of the motor drive management unit 230' outputs minute rotation commands to the rail motor 119 'and the clutch motor 81' to such an extent that the state of the rail mechanism 27 'and the conveyor chain clutch 53' is not changed. The reverse minute rotation command from the minute rotation command section 231 ' is used to cancel the minute rotation generated by the track motor 119 ' and the clutch motor 81 '.

Regardless of the output of the minute rotation command from the minute rotation command section 231 ', when the minute rotation corresponding to at least one of the rail motor 119' and the clutch motor 81 'is not detected by the potentiometers 119A' and 83 'as the rotation detectors, the abnormality determination section 240' regards that an abnormality such as disconnection or connection failure of the signal line, the control line, and the power line, failure of the rail motor 119 'or the clutch motor 81', or failure of another operating device has occurred.

The engine drive management unit 220' has the following two functions.

(a) The driving of the engine E ' is prohibited on the condition that the open posture of the rail mechanism 27 ' is detected by the rail posture detecting unit 260 '. At this time, when it is desired to prohibit starting of the engine E 'during the engine stop, a start prohibition command is given to the engine control unit 201', and when it is desired to stop the engine E 'during the engine drive, a stop command is given to the engine control unit 201'.

(b) When the abnormality determination unit 240 ' determines that an abnormality has occurred, a command for prohibiting driving of the engine E ', a start prohibition command, or a stop command is output to the engine control unit 201 '.

Another embodiment of the present invention will be described below.

(1) The functional units shown in fig. 15 and 28 are separated by way of example, and the functional units may be combined or divided. As long as the control function of the present invention can be realized, any functional unit configuration may be adopted, and these functions may be realized by hardware, software, or both.

(2) The sensors and switches according to the present invention, for example, the clutch switch SW2 ', the rail open operation switch SW 1', the key switch KSW ', the potentiometer 83', the rail open detection switch 150 ', and the potentiometer 119A' may be configured in a different form from the above-described embodiment, or may be arranged at positions different from the above-described embodiment.

Industrial applicability of the invention

The present invention can be applied to a combine harvester equipped with a grain straw conveying unit CU 'for feeding harvested grain straws into a threshing unit 4'.

Claims

1. A combine harvester comprising an engine, a harvesting part driven by the rotational power of the engine, and a threshing device, the combine harvester comprising:

a conveying chain driven by the rotational power of the engine and conveying the grain stalks harvested by the harvesting unit to the threshing device;

a guide rail mechanism having a guide rail capable of changing a posture between a closed posture in which the guide rail is close to the conveyor chain so as to guide the grain or straw conveyed by the conveyor chain from above and an open posture in which the guide rail is spaced upward from the conveyor chain;

a rail posture detecting unit that detects an open posture of the rail mechanism;

an engine drive management unit that prohibits driving of the engine on the condition that the open posture is detected by the rail posture detection unit;

the combine harvester further includes a clutch for turning on and off power from the engine to the threshing device, and the engine drive management unit prohibits driving of the engine on the basis of an additional condition that the clutch is turned on.

2. A combine harvester according to claim 1,

the engine drive management unit prohibits starting of the engine when the open posture is detected by the rail posture detection unit before starting of the engine.

3. A combine harvester according to claim 1,

the engine drive management unit stops the engine when the open posture is detected by the rail posture detection unit while the engine is being driven.

4. A combine harvester according to claim 2,

5. A combine harvester according to any one of claims 1-4,

the combine harvester further includes a normally closed type open guide detection switch that closes a contact when the guide mechanism is in the closed position and opens the contact when the guide mechanism is in the open position, and the guide posture detection unit is configured to detect the open position of the guide mechanism by flowing a current through the open guide detection switch.

6. A combine harvester according to any one of claims 1-4,

the combine harvester is provided with a manual operation part for manually changing the posture of the guide rail mechanism and a guide rail opening action switch for electrically changing the posture of the guide rail mechanism.

7. A combine harvester according to claim 5,

8. A combine harvester comprising an engine, a harvesting part driven by the rotational power of the engine, and a threshing device, the combine harvester comprising:

9. A combine harvester according to claim 8,

10. A combine harvester according to claim 8 or 9,

11. A combine harvester according to claim 8 or 9,

12. A combine harvester according to claim 10,

13. A combine harvester comprising an engine, a harvesting part driven by the rotational power of the engine, and a threshing device, the combine harvester comprising:

14. A combine harvester according to claim 13,

15. A combine harvester according to claim 13 or 14,

16. A combine harvester comprising an engine, a harvesting part driven by the rotational power of the engine, and a threshing device, the combine harvester comprising:

a straw conveying device capable of changing a state between a first state and a second state;

an electric motor unit having an electric motor that moves the straw conveying device from the first state to the second state by rotation exceeding a prescribed rotation angle from a home position;

a minute rotation command unit that outputs a minute rotation command for causing the electric motor unit to rotate minute by an angle equal to or less than the predetermined rotation angle;

a rotation detector that detects rotation of the electric motor;

and an abnormality determination unit that determines that an abnormality has occurred when the rotation detector does not detect the minute rotation of the electric motor, regardless of an output of the minute rotation command.

17. A combine harvester according to claim 16,

the combine harvester further comprises a clutch operated by a clutch motor of the electric motor unit, and a conveying chain for conveying the harvested straws to the threshing device by using the engine power transmitted through the clutch,

the conveyor chain is included in the grain and straw conveyor, and the clutch is in a power transmission position in the first state and in a power cutoff position in the second state.

18. A combine harvester according to claim 16 or 17,

the combine harvester further comprises a rail mechanism capable of changing a posture between a closed posture in which the grain and straw conveyed to the threshing device by the conveyor chain is guided and an open posture in which the grain and straw is separated from the conveyor chain by using a rail motor of the electric motor unit,

the guide rail mechanism is included in the grain and straw conveying device, and is in the closed posture in the first state, and is in the open posture in the second state.

19. A combine harvester according to claim 16 or 17,

when the minute rotation of the electric motor caused by the output of the minute rotation command is detected, the minute rotation command unit reverses the electric motor to cancel the minute rotation.

20. A combine harvester according to claim 16 or 17,

the combine harvester further includes an engine drive management unit configured to prohibit driving of the engine when it is determined that the abnormality has occurred.

21. A combine harvester according to claim 16 or 17,

the minute rotation is executed by the minute rotation command unit as an initial check process performed before the engine is started by the key switch, and when it is determined that the abnormality has occurred, the engine is prohibited from being started.

22. A combine harvester according to claim 16 or 17,

the minute rotation is executed by the minute rotation command section during engine driving.