JP2022100107A - combine - Google Patents

Abstract

To provide a combine capable of preventing unexpected opening/closing of an upper cover, and performing maintenance work without troublesomeness.SOLUTION: A drive shaft for transmitting power to a plurality of lifting devices 13 and an upper cover 46 for covering a front part of the drive shaft are provided on a reaping part 2 of a machine body front part. The lifting device 13 can be switched in a posture between a normal action posture and an open posture in which the lifting device oscillates upward. The upper cover 46 is supported to the lifting devices 13 so as to oscillate vertically around a lateral shaft core of an upper part, over the closed state and the open state, and is provided with a position holding mechanism 52 for holding a position of the upper cover 46 to the closed state. The position holding mechanisms 52 releases position holding when the lifting devices 13 are switched to the open posture.SELECTED DRAWING: Figure 2

Description

The present invention relates to a combine in which a harvesting section for cutting planted culms is provided in the front portion of the machine body, and a plurality of raising devices arranged in the left-right direction are provided in the cutting section.

The combine is provided with a pulling drive shaft that extends in the left-right direction while being located above the plurality of pulling devices and transmits power to each of the plurality of raising devices, and is provided in front of the raising drive shaft. The side is covered by a top cover. Conventionally, the upper cover is supported so as to be swingable up and down around the horizontal axis core so that the posture can be changed between a closed state that covers the front side of the drive shaft and an open state that opens the front side of the drive shaft. In addition, there is one in which an elastic engagement type clip is sandwiched between the mounting pins on the fixed side to hold the position in the closed state (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-29569

In the above-mentioned conventional configuration, by holding the clip locked, it is possible to prevent the upper cover from fluttering due to the influence of body vibration, wind, or the like and unexpectedly opening and closing. However, when performing maintenance work on the raising device or the inside of the machine, the upper cover is rocked upward to release the position holding by the clip, the upper cover is switched to the open state, and then the raising device is opened. Need to switch to.

As a result, apart from the work of switching the raising device to the open state, it is necessary to switch the upper cover to the open state against the locking holding force of the clip, which is troublesome.

Therefore, there has been a demand for maintenance work to be performed without trouble while preventing the upper cover from opening and closing unexpectedly.

The characteristic configuration of the combine according to the present invention is that a cutting section for cutting planted grain stalks is provided at the front portion of the machine body, and the cutting section has a plurality of raising devices arranged in the left-right direction and above the plurality of raising devices. A drive shaft extending along the left-right direction and transmitting power to each of the plurality of raising devices in a state of being located in the above position, and an upper cover covering the front side of the driving shaft are provided, and the raising device is provided. The posture can be switched between a normal working posture that swings up and down around the axis of the drive shaft and raises the grain, and an open posture that swings upward to open the rear space. The upper cover is configured to swing up and down around the upper horizontal axis core in a closed state covering the front side of the drive shaft and an open state in which the front side of the drive shaft is opened. A position holding mechanism for holding the upper cover in the closed state is provided, and the position holding mechanism is supported by the pulling device when the raising device is switched from the normal working posture to the open posture. The point is that the front surface is in contact with each other and is configured to release the position holding.

According to the present invention, since the upper cover is held in the closed state by the position holding mechanism during the cutting work, it is possible to prevent the upper cover from fluttering and unexpectedly opening and closing due to the influence of body vibration, wind, or the like. Can be done. The raising device swings up and down around the axis of the drive shaft to switch to the open posture, so that maintenance work inside the machine body can be easily performed. Then, when the raising device is switched from the normal working posture to the open posture for maintenance work, the cover member is switched to the open state accordingly. At this time, the front surface of the raising device comes into contact with the upper cover, the upper cover interlocks and swings, and the position holding mechanism releases the position holding. As a result, there is no troublesome operation such as performing the posture switching operation of the raising device and the posture switching operation of the upper cover separately.

Therefore, it has become possible to prevent the upper cover from opening and closing unexpectedly, and to perform maintenance work without trouble.

In the present invention, the position holding mechanism holds the upper cover by magnetic force attracting the first member provided on the upper cover side and the second member provided on the drive shaft side. Suitable.

According to this configuration, the upper cover is held in the closed state by attracting the first member and the second member by magnetic force. When the raising device is switched from the normal working posture to the open posture, the first member and the second member are separated from each other against the magnetic force due to the operating force. The magnetic force may be such that the upper cover does not unexpectedly open and close during the cutting operation, and can be easily separated by the operating force accompanying the posture change of the raising device.

Further, if the configuration is such that the position is held by a magnetic force, it is less likely to be crushed or the like, and it is easy to smoothly release the position holding as compared with the mechanical locking holding.

In the present invention, it is preferable that the position holding mechanism has a structure in which an iron material and a magnet are attracted by a magnetic force.

According to this configuration, by using an iron material for one of the first member and the second member, the configuration can be simplified as compared with the case where both members are magnets.

In the present invention, it is preferable that the first member is an iron material and the second member is a magnet.

According to this configuration, since the first member made of iron material is provided on the upper cover side, for example, even when the upper cover is made of resin material, a simple support structure without using a fastening structure with bolts or the like is used. It becomes possible to correspond with.

In the present invention, it is preferable that the back surface of the upper cover is provided with a locking portion for locking and holding the first member.

According to this configuration, since the first member is locked and held, the upper cover can be easily attached and detached.

In the present invention, it is preferable that the back surface of the upper cover is provided with a reinforcing rib extending in the left-right direction, and the reinforcing rib is provided with the locking portion.

According to this configuration, the strength of the upper cover can be reinforced by having the reinforcing ribs. Then, by effectively using this reinforcing rib, the locking portion can be handled with a simple structure.

In the present invention, a plurality of drive transmission units for branching and transmitting power from the drive shaft to each of the plurality of raising devices are provided at intervals in the left-right direction, and the first member is adjacent to the drive transmission. It is preferable that the portion is provided at a position corresponding to the left and right middle portions of the portion.

According to this configuration, focusing on the fact that the drive transmission unit that transmits power to a plurality of raising devices is provided at intervals on the left and right, the empty area in the left and right intermediate portions of the drive transmission unit is effectively used. The first member can be arranged compactly.

In the present invention, it is preferable that the first member is provided at a position facing the drive shaft.

According to this configuration, since the upper cover is held in a position facing the drive shaft, it is possible to maintain a good distance from the drive shaft, and the upper cover is pushed backward by contact with an external object. It is possible to prevent the vehicle from coming close to the drive shaft even if it is damaged.

In the present invention, it is preferable that the second member is provided on a cover member that is located in front of the drive shaft and covers the drive shaft.

According to this configuration, the drive shaft is covered with a cover member so that the crop does not wrap around due to rotation. Therefore, the second member can be attached by effectively using this cover member.

In the present invention, a plurality of drive transmission units for branching and transmitting power from the drive shaft to each of the plurality of raising devices are provided at intervals in the left-right direction, and the second member is adjacent to the drive transmission. It is preferable that the portion is provided at a position corresponding to the left and right middle portions of the portion.

According to this configuration, focusing on the fact that the drive transmission unit that transmits power to a plurality of raising devices is provided at intervals on the left and right, the empty area in the left and right intermediate portions of the drive transmission unit is effectively used. The second member can be arranged compactly.

It is a side view of a combine. It is a front view of a combine. It is a side view which shows the support structure of a raising device. It is a vertical sectional side view of the upper cover arrangement part. It is a perspective view which shows the attachment state of the 2nd member. It is a cross-sectional plan view which shows the mounting state of the 2nd member. It is a perspective view which shows the attachment state of the 1st member. It is a front view of the left end part of the top cover. It is a vertical sectional side view of the upper cover arrangement part of another embodiment. It is a vertical sectional side view of the upper cover arrangement part of another embodiment.

An embodiment of the present invention will be described with reference to the drawings. In the following description, the direction of the arrow "F" is the "front side of the aircraft", the direction of the arrow "B" is the "rear side of the aircraft" (see FIG. 1), and the direction of the arrow "L" is the "left side of the aircraft". The direction of the arrow "R" is "the right side of the aircraft" (see Fig. 2).

〔overall structure〕
As shown in FIG. 1, the combine according to the present invention includes a traveling machine body 1 and a cutting section 2 capable of cutting 7 planted culms. The cutting portion 2 is connected to the traveling machine body 1 so as to be able to swing up and down around the horizontal axis P1, and is provided so as to be driven and raised and lowered by a hydraulic cylinder 3 for raising and lowering.

The traveling machine body 1 is provided with left and right crawler traveling devices 4, and is provided with a driving unit 5 on the right side (one side in the left-right direction) of the front portion of the machine body. Behind the driving unit 5, a threshing device 6 for threshing the grain culms cut by the cutting unit 2 and a grain tank 7 for storing the grains obtained by the threshing process are arranged side by side in the machine body. It is equipped with. The driving unit 5 is covered with a cabin 8. Although not shown, the threshing device 6 handles and processes the tip side in the handling chamber while sandwiching and transporting the stock root of the harvested culm transported from the harvesting unit 2 by the threshing feed chain 9. Grains and dust are sorted by the sorting section provided at the bottom. The grains are stored in the grain tank 7, and the dust is discharged to the outside of the machine. It is provided with a grain discharging device 10 capable of discharging grains stored in the grain tank 7 to the outside, and a shredding device 11 for shredding the discharged straw after the threshing process and then discharging it to the outside of the machine. ..

As shown in FIGS. 1 and 2, the cutting section 2 is provided at intervals in the left-right direction, and is a weeding guide for introducing the planted culms of each row to the seven culm introduction routes. Multiple (8) weeding tools 12 and multiple (7) raisings that are provided in a state of being lined up in the left-right direction corresponding to each of all grain culm introduction routes and cause planting culm. The device 13 is provided with a varican-type cutting blade 14 for cutting the root of the raised planted culm, and a transport device 15 for merging the cut culm in the cutting width direction and transporting the cut culm to the rear. There is.

The cutting section 2 is provided with a cutting frame 20 that supports the entire cutting section 2. The cutting frame 20 includes a main frame 22 that extends from the machine frame 21 to the front of the machine and is supported so that the rear end can swing up and down, a horizontal frame 23 that extends to the front end of the main frame 22 in the left-right direction, and a horizontal frame. It is provided with a raising transmission case 24 or the like extending upward from one end of the traveling machine.

The hydraulic cylinder 3 is connected over the main frame 22 and the machine frame 4, and the cutting unit 2 is swung up and down by the hydraulic cylinder 3 to move up and down the working position for cutting (state shown by a solid line in FIG. 1) and above. It is configured to be able to move up and down over the retracted position (state shown by virtual lines in FIGS. 1 and 2) as the maximum rising position located at.

The cutting unit 2 is provided with left and right side covers 25 that cover the lateral sides of the plurality of raising devices 13 in the left-right direction. Above the left and right side covers 25, left and right headlight devices 26 and left and right headlight covers 27 that cover the headlight devices 26 are provided.

The headlight cover 27 covers the periphery of the headlight device 26 provided on the upper part of the left and right side portions of the cutting portion 2 and the upper side portion of the lateral sides of the plurality of raising devices 13 in the left-right direction. It is configured as follows. The left and right side covers 25 are configured to cover the lower portion of the lateral sides of the plurality of raising devices 13 in the left-right direction.

[Raising device]
The raising device 13 is provided in an upright posture in which the lower end side is located on the front side of the machine body and the upper end side is located on the rear side of the machine body in a backward tilted state. As shown in FIG. 2, the raising device 13 extends endlessly over the driving wheel 29 and the tension wheel 30 arranged in the upper part of the raising case 28 and the guide wheel 31 arranged in the lower part of the case. The moving chain 32 is wound and stretched. A large number of raising claws 33 are undulated and supported at a predetermined pitch on the endless rotating chain 32.

In the raising device 13, the path that moves upward among the moving paths on both the left and right sides of the endless rotating chain 32 is the raising path Q1, and the opposite side is the return path Q2. In the raising path, a guide plate for raising and guiding the raising claw 33 to a position where the endless rotating chain 32 passes is provided. In the raising path Q1, the raising device 13 moves up while the raising claw 33 protruding laterally moves up while combing the grain culm, and when it reaches the end of the raising path Q1, it is separated from the grain culm and raised. It is housed inside the culm case 28, descends the return path, raises it, and returns to the action path side.

A pulling drive shaft 34 that extends along the left-right direction and transmits power to each of the plurality of raising devices 13 while being located above the plurality of raising devices 13 is provided. Although not shown, the transmission structure is not shown, but the power from the machine body side is the front-rear transmission shaft provided inside the main frame 22, the lateral transmission shaft provided inside the horizontal frame 23, and the raised transmission case 24. It is raised and transmitted to the drive shaft 34 via the vertical transmission shaft provided inside the.

A plurality of drive transmission units 35 for branching and transmitting power from the raising drive shaft 34 to each of the plurality of raising devices 13 are provided at intervals in the left-right direction. As shown in FIG. 4, the drive transmission unit 35 includes an upper bevel gear mechanism 37, a vertical transmission shaft 38 extending along the longitudinal direction of the case, and a lower bevel gear mechanism 39 inside the vertically long drive case 36. , And a front-rear transmission shaft 40 are built in, and are configured to transmit power from the raising drive shaft 34 to the driving wheel 29 of the raising device 13.

As shown in FIG. 3, a support arm 41 made of a pipe bent in a chevron shape from the base end boss portion of the cutting frame 20 is raised toward the front and extends to an upper portion of the device 13. A support frame 42 extending in the left-right direction is connected to the front end of the support arm 41 along the upper side of the plurality of raising devices 13. The support frame 42 is formed by bending a plate material, and the front end of the support arm 41 is connected to the support frame 42.

A plurality of support brackets 43 are bolted to the support frame 42 at intervals in the left-right direction, and a drive case 36 is fitted and supported on each support bracket 43 so as to be swingable up and down around the horizontal axis X1. The drive shaft 34 is raised and supported through the upper part of the drive case 36. The drive case 36 is supported so as to be able to swing up and down around the axis X1 of the raised drive shaft 34.

The raising device 13 is connected to the drive case 36 in a state where it can swing integrally. As shown in FIGS. The posture can be switched to an open posture (indicated by a virtual line in FIG. 4) that swings upward to open the rear space. An air damper 44 for holding the position in the open posture is provided.

As shown in FIGS. A wrapping prevention cover 45 is provided so as to cover the side. The left and right sides of the wrapping prevention cover 45 are bolted to the support bracket 43.

[Top cover]
As shown in FIGS. 2, 3 and 4, an upper cover 46 is provided to cover the front side of the raising drive shaft 34. The upper cover 46 is provided so as to extend left and right from the leftmost raising device 13 to the rightmost raising device 13. The upper cover 46 is made of a resin material, and covers an open state in which the front side of the raised drive shaft 34 is covered and an open state in which the front side of the raised drive shaft 34 is opened. It is supported by the device 13 by raising it so that it can swing up and down around it.

The upper cover 46 is formed with an upward recessed portion 47 that is recessed upward at a position corresponding to the upper side of the raising path Q1 of each of the plurality of raising devices 13. Therefore, it is easy to prevent the upper part of the planted culm caused by the raising device 13 from interfering with the upper cover 46, resulting in poor transportation of the culm.

The upper portion 46A of the upper cover 46 is provided in a state of being stepped toward the front side with respect to the front surface 13a of the raising device 13, and the lower portion of the upper cover 46 below the raising drive shaft 34. A proximity portion 48 that raises the side portion 46B and approaches the device 13 is provided. As shown in FIGS. There is.

A proximity portion 48 is provided at a portion corresponding to the upper side of the return path Q2 of each of the plurality of raising devices 13 in the lower portion 46B of the upper cover 46. The portion of the upper cover 46 corresponding to the upper side of the return path Q2 is wide in the vertical direction and extends below the upper end position of the raising device 13. A proximity portion 48 is provided in the middle of the wide extension portion in the vertical direction.

The proximity portion 48 is located above the upper end position of the raising device 13. That is, a backward curved surface 49 is formed which is recessed above the upper end position of the raising device 13 so as to approach the raising device 13. As a result, even if the tip side of the planted culm caused by the raising device 13 leans on the corresponding portion above the return path Q2, it interferes with the upper cover 46 and the culm is poorly transported. Easy to avoid happening.

As shown in FIG. 8, of the left-right inward parts of the headlight cover 27, the sideways retreating part 50 that retires to the left-right outward side in the front view at the part adjacent to the lower part of the upper cover 46. Is provided. An overhanging portion 51 projecting outward in the left-right direction is provided at the outer end portion in the left-right direction of the lower portion of the upper cover 46 so as to enter the laterally retracted portion 50 of the headlight cover 27. With such a configuration, the gap between the headlight cover 27 and the upper cover 46 becomes small, the grain culm does not enter, and it is easy to avoid the occurrence of poor transportation of the grain culm.

[Position holding mechanism]
A position holding mechanism 52 for holding the position of the upper cover 46 in the closed state is provided. As shown in FIG. 2, the position holding mechanism 52 is provided at a position corresponding to each of a plurality of locations on the upper cover 46 where the upward recessed portion 47 is formed in the front view. The position holding mechanism 52 holds the upper cover 46 in a position by attracting the first member 53 provided on the upper cover 46 side and the second member 54 provided on the raising drive shaft 34 side by a magnetic force. It is configured in. That is, the iron material and the magnet are attracted by a magnetic force. The first member 53 is made of an iron material, and the second member 54 is made of a permanent magnet.

As shown in FIGS. 4 and 7, the back surface of the upper cover 46 is provided with a reinforcing rib 55 extending in the left-right direction. Reinforcing ribs 55 are formed at two locations above and below the back surface of the upper cover 46 in a state of being integrally molded with the upper cover 46. The reinforcing rib 55 is provided with a locking portion 56 for locking and holding the first member 53.

The locking portion 56 is provided with an extending portion extending downward from the upper reinforcing rib 55, and the first member 53 is locked and held in a recessed portion between the extending portion and the upper cover 46. An extension portion extending upward from the lower reinforcing rib 55 is provided, and the first member 53 is locked and held in a recessed portion between the extension portion and the upper cover 46. It is configured as follows.

The first member 53 is formed by bending an iron plate into a shape that allows it to easily enter the upper and lower locking members 56. The upper and lower insertion recesses 58 and 60 are configured to be sandwiched and held by elastic deformation while the first member 53 is inserted.

When viewed from the front, the first member 53 is located at a position corresponding to each of the plurality of locations where the upward recessed portion 47 is formed in the upper cover 46, that is, the left and right of the adjacent drive transmission portions 35 among the plurality of drive transmission portions 35. It is provided in the position corresponding to the middle part. Further, the first member 53 is provided at a position facing the raised drive shaft 34 in the side view.

The second member 54 is composed of a permanent magnet and is provided at a position facing the first member 53, that is, a position corresponding to the left and right intermediate portions of the adjacent drive transmission portions 35 among the plurality of drive transmission portions 35. There is. The second member 54 is attached to the winding prevention cover 45 provided on the front side of the raising drive shaft 34.

As shown in FIGS. 5 and 6, the connecting pedestal portion 61 to which the second member 54 is attached in a fixed state is abutted from the rear surface side of the winding prevention cover 45 and connected by bolts. When the pedestal portion 61 is attached, the second member 54 is configured to be exposed toward the front through the insertion hole 62 formed in the wrapping prevention cover 45.

When the upper cover 46 is in the closed state, the first member 53 is located in a state of facing and close to the second member 54, and the first member 53 and the second member 54 are attracted by a magnetic force to cause the upper cover 46 to be attracted to each other. The position is held in the closed state.

The position holding mechanism 52 is configured to release the position holding by a force for ascending and swinging the upper cover 46. That is, the force attracted by the magnetic force is set to such a force that the position holding can be released by raising and swinging the upper cover by manual operation.

The upper cover 46 is provided so as to cover the upper front side portion of the raising device 13, and the position holding mechanism 52 is provided with the first member 53 and the second member when the raising device 13 is switched from the normal working posture to the open posture. It is configured so that the 54 and the 54 overcome the force attracted by the magnetic force, and the front surface 13a of the raising device 13 comes into contact with each other to release the position holding.

〔Direction indicator〕
Left and right direction indicators 62R and 62L are provided while being located at the front of the aircraft. In the left and right direction indicators 62R and 62L, the right direction indicator 62R as one of them is provided on the right side of the front part of the cabin 8 as one side in the left and right direction. On the other hand, the left side direction indicator 62L is provided at the left side portion of the front portion of the machine body as the opposite side in the left-right direction, that is, the left portion of the cutting portion 2. As shown in FIG. 3, the turn signal 62L on the left side is supported by a support 72 connected to the cutting frame 20.

The right turn signal 62R is supported by the front pillar 64 of the cabin 8. A rear-view mirror 65 is provided on the lateral outer side of the cabin 8, and the right direction indicator 62R is provided below the lower end of the back mirror 65 and at the same height as the upper end of the threshing device 6. ..

An operation unit 67 having a changeover switch 66 as an operation tool for switching the operating state of the direction indicators 62R and 62L is provided on the right side portion in the front portion inside the cabin 8. The right direction indicator 62R is provided at the same height as the operation unit 67 and at a height corresponding to the lower end of the right end of the windshield 68 of the cabin 8 in front view.

The right end portion of the cutting portion 2 is located on the outer side in the right direction with respect to the right end portion of the cabin 8. Even with such a configuration, it is possible to visually check the direction indicator 62R on the right side from the front side when the cutting unit 2 is raised to the retracted position.

The right direction indicator 62R is provided at a position higher than the cutting section 2 in the retracting position so that when the cutting section 2 is raised to the retracted position, it can be visually recognized from the front side of the machine body. The right turn signal 62R is provided at a position higher than the height of the left turn signal 62R even when the cutting portion 2 is raised to the retracted position.

[Another Embodiment]
(1) In the above embodiment, the first member 53 is made of an iron material and the second member 54 is made of a magnet. Instead of this configuration, the first member 53 is made of a magnet and the second member 54 is made of a magnet. The structure may be an iron material, or the first member 53 and the second member 54 may both be magnets.

(2) In the above embodiment, the first member 53 and the second member 54 are provided at positions corresponding to the left and right intermediate portions of the adjacent drive transmission portions 35, but the first member 53 and the second member 54 are provided. May be provided between the drive transmission unit 35 and the back surface of the upper cover 46.

(3) In the above embodiment, the reinforcing rib 55 provided on the back surface of the upper cover 46 is provided with the locking portion 56, but instead of this configuration, the first member 53 is supported on the upper cover 46. A dedicated bracket for the purpose may be provided, and the bracket may be provided with a locking portion.

(4) In the above embodiment, the wrapping prevention cover 45 is provided so as to raise and cover the front side and the lower side of the drive shaft 34, and the wrapping prevention cover 45 is provided with the second member 54. Instead of this configuration, a tubular case covering the entire circumference of the drive shaft 34 may be provided, and the tubular case may be provided with the second member 54.

(5) In the above embodiment, the position holding mechanism 52 is configured such that the first member 53 and the second member 54 are attracted by a magnetic force, but instead of this configuration, it corresponds to the posture change of the raising device 13. As long as the configuration is such that the connection is released, the position may be held by engaging the members with each other, and various configurations can be used as the position holding mechanism 52.

(6) In the above embodiment, the upper cover 46 is configured to form the upward recessed portion 47, but such an upward recessed portion 47 may not be formed.

(7) In the above embodiment, the proximity portion 48 is configured to form a backward curved surface 49 that is recessed so as to approach the raising device 13, but instead of this configuration, for example, FIG. 9 As shown in FIG. 10, a structure may be formed in which an inclined surface 69 is formed as a proximity portion 48 on the lower side portion 46B so as to be raised from the upper side portion 46A and inclined toward the device 13. Also, as shown in FIG. As shown, the proximity portion 48 may be configured such that a forward curved surface 70 is formed as the proximity portion 48, which is curved in a shape that bulges forward from the upper side portion 46A and approaches toward the raising device 13.

The present invention can be applied to a head-feeding combine.

2 Cutting part 13 Raising device 34 Drive shaft 46 Top cover 52 Position holding mechanism 53 First member 54 Second member 55 Reinforcing rib 56 Locking part

Claims (10)

The front part of the machine is equipped with a cutting section for cutting planted culms.
A drive that extends along the left-right direction and transmits power to each of the plurality of raising devices arranged in the left-right direction and the plurality of raising devices located above the plurality of raising devices in the cutting portion. A shaft and an upper cover covering the front side of the drive shaft are provided.
The raising device is supported so as to be swingable up and down around the axis of the drive shaft, and has a normal working posture for raising the culm and an open posture for swinging upward to open the rear space. It is configured to be able to switch the posture to
The upper cover is supported by the raising device so as to be able to swing up and down around the horizontal axis core of the upper portion in a closed state covering the front side of the drive shaft and an open state in which the front side of the drive shaft is opened. ,
A position holding mechanism for holding the upper cover in the closed state is provided.
The position holding mechanism is a combine configured so that when the raising device is switched from the normal working posture to the open posture, the front surface of the raising device comes into contact with each other to release the position holding. The first aspect of the invention according to claim 1, wherein the position holding mechanism holds the position of the upper cover by attracting the first member provided on the upper cover side and the second member provided on the drive shaft side by a magnetic force. Combine. The combine according to claim 2, wherein the position holding mechanism is configured such that an iron material and a magnet are attracted by a magnetic force. The combine according to claim 3, wherein the first member is an iron material and the second member is a magnet. The combine according to claim 4, wherein a locking portion for locking and holding the first member is provided on the back surface of the upper cover. The back surface of the top cover is provided with reinforcing ribs extending in the left-right direction.
The combine according to claim 5, wherein the reinforcing rib is provided with the locking portion. A plurality of drive transmission units for branching and transmitting power from the drive shaft to each of the plurality of raising devices are provided at intervals in the left-right direction.
The combine according to any one of claims 2 to 6, wherein the first member is provided at a position corresponding to the left and right intermediate portions of the adjacent drive transmission portions. The combine according to any one of claims 2 to 7, wherein the first member is provided at a position facing the drive shaft. The combine according to any one of claims 2 to 8, wherein the second member is provided on a cover member located in front of the drive shaft and covering the drive shaft. A plurality of drive transmission units for branching and transmitting power from the drive shaft to each of the plurality of raising devices are provided at intervals in the left-right direction.
The combine according to any one of claims 2 to 9, wherein the second member is provided at a position corresponding to the left and right intermediate portions of the adjacent drive transmission portions.

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