JP5341396B2 - Threshing equipment - Google Patents

Description

  The present invention relates to an improvement of a threshing device used in a combine or a stationary threshing device.

Conventionally, the threshing device of the threshing device has a structure having the structure shown in [1] below.
[1] A structure in which a plurality of blades positioned at a predetermined interval in the radial direction are connected and fixed at two locations in the axial direction of the rotating shaft with respect to the rotating shaft to which power on the driving side is transmitted ( Patent Document 1).

Japanese Patent Laid-Open No. 11-18560 (paragraph [0030], FIG. 2, FIG. 6)

As shown in Patent Document 1, between the rotating shaft to which the power on the driving side is transmitted and the surrounding blades, the rotational power on the rotating shaft side is transmitted to the blades and the blades are supported. In order to perform firmly, the rotating shaft and the blade piece were integrally connected using the support arms at two positions separated in the axial direction of the rotating shaft.
However, the rotating shaft is in the middle of the power transmission system and is often used as a relay shaft for transmitting power to the threshing selection unit, the feed chain, etc. The drive shaft may be slightly bent due to twisting or tension of the transmission belt hung on the end of the rotating shaft.
As described above, when the rotation shaft is twisted or bent, a large external force is repeatedly applied to the connection portion between the blade piece and the support arm that are connected at two positions separated in the rotation axis direction. For this reason, there is a tendency that the possibility of breakage at the connecting portion increases as the rotating shaft and the blade piece are made thinner due to the demand for weight reduction of the entire apparatus.

  The object of the present invention is to reduce the weight of the entire apparatus by minimizing the effect of external force due to the twisting or bending on the connecting portion with the blade piece even if the rotating shaft transmitting power is twisted or bent. The purpose is to provide a threshing device for threshing that has become possible.

[Solution 1]
The technical means of the present invention taken in order to solve the above-mentioned problem is a threshing apparatus comprising a tang that blows a sorting wind for wind selection processing to a sorting and collecting unit of the threshing apparatus as described in claim 1. Of
The tang is connected to a rotating shaft to which power on the driving side is input, a blade piece that is located radially away from the rotating shaft, and the rotating shaft and the blade piece are connected to transmit the rotating power. A wing piece support mechanism,
The wing support mechanism, the connection points for a rotary power transmission for said rotary shaft and one wing, Ri Oh provided only in one location in the axial direction of the rotary shaft,
The wing piece support mechanism includes a single connecting portion for transmitting rotational power to the rotating shaft, and includes a plurality of supporting portions that support the wing pieces at locations away from the connecting portion in the axial direction of the rotating shaft. and wherein the Tei Rukoto.

[Action and effect]
As described above, in the Karatsu of the threshing device of the present invention according to the solution 1, the wing piece support mechanism for connecting the wing pieces positioned in the radial direction with respect to the rotating shaft to which the power on the driving side is input. As described above, the connecting portion for transmitting rotational power to the rotating shaft and one blade piece is configured to be only one portion in the axial direction of the rotating shaft.
Therefore, even if the rotating shaft is twisted or bent due to a driving load or the like, the connecting portion for transmitting the rotational power between the rotating shaft and the blade piece is only one point in the axial direction of the rotating shaft. , It is possible to avoid the twist or bending being transmitted to the wing side. In other words, when the rotating shaft is twisted or bent, if the rotating shaft side and the blade piece side are connected at multiple locations on the axis of the rotating shaft, the degree of twist angle or bending between the connecting points Therefore, an external force corresponding to the difference acts on each connection point, and there is a risk that the connection point will be damaged during long-term use. Therefore, it is possible to avoid the occurrence of an external force corresponding to such a difference.

  As a result, in the present invention, even if twisting or bending occurs in the power transmission rotating shaft, it is possible to transmit only the desired rotational power to the blade side without transmitting the influence of the twisting or bending to the blade side. Thus, there is an advantage that the durability can be improved without causing an increase in the weight of the entire apparatus, such as specially increasing the strength at the connection point between the rotating shaft and the blade piece.

Further , according to the blade support mechanism described above, there is only one connecting portion for transmitting power from the rotating shaft to the blade, but the supporting portion that supports the blade is connected in the axial direction of the rotating shaft from the connecting portion. Therefore, there is an advantage that the posture of the blade piece can be supported stably with a long span in the axial direction of the rotation shaft and can be stably maintained.

[Solution 2 ]
According to a second solving means of the threshing apparatus of the present invention, as described in claim 2 , the wing piece support mechanism includes a cylindrical fitting body fitted on a rotating shaft, and the cylindrical fitting body is rotated. A fixed coupling body fixed in a non-rotating state with respect to the shaft; and an arm that extends from the cylindrical fitting body and is coupled to a wing piece, wherein the cylindrical fitting body and the fixed coupling body transmit rotational power. The connecting portion is configured, and the support portion is configured by the cylindrical fitting body and the arm.

[Action and effect]
As described above, the tang of the threshing apparatus of the present invention according to the solution means 2 has the following effects in addition to the same effects as the invention according to the solution means 1 .
In other words, according to the blade support mechanism described above, a configuration in which the connecting portion for transmitting power from the rotating shaft to the blade piece is one place, but the support parts for supporting the blade pieces are provided in a plurality of places. There is an advantage that the structure can be easily configured by using a unit, a means for preventing the cylindrical fitting body from rotating, and an arm.

[Solution 3 ]
According to a third solving means of the threshing apparatus of the present invention, as described in claim 3 , the wing piece support mechanism includes a cylindrical fitting body on both sides of the fixed coupling body, It is characterized in that a gap allowing a relative displacement within a predetermined range between the cylindrical fitting body and the rotary shaft is formed between the peripheral surface and the rotary shaft outer peripheral surface.

[Action and effect]
In the tang of the threshing apparatus according to the present invention according to the solving means 3 configured as described above, the following effects are obtained in addition to the same effects as the invention according to the solving means 2 .
That is, a gap allowing a relative displacement within a predetermined range between the cylindrical fitting body and the rotating shaft is formed between the inner peripheral surface of the cylindrical fitting body and the outer peripheral surface of the rotating shaft. Even if twisting or bending occurs, the twisting or bending is not transmitted to the cylindrical fitting body, and can be absorbed as a relative displacement between the rotating shaft and the cylindrical fitting body in the gap.
Therefore, it is possible to avoid the influence of twisting and bending of the rotating shaft on the cylindrical fitting body side, and by the cylindrical fitting body not affected by the twisting and bending of the rotating shaft, and on the cylindrical fitting body side The plurality of support portions has an advantage that the wing piece can be supported in an appropriate posture with a simple structure.

Hereinafter, an example of an embodiment of the present invention will be described based on the drawings.
[Overall structure of the combine]
First, the structure of the entire combine to which the present invention is applied will be described.
FIG. 1 shows the entire side surface of the self-removing combine, and FIG. 2 shows the entire plane. This combine is provided with a machine body frame 1 formed in a frame shape by a square pipe material or the like, and a pair of left and right crawler type traveling devices 2 are provided at the lower part of the machine body frame 1. A cutting and conveying device 3 connected to the front and left front portions of the body frame 1 so as to be able to move up and down is provided, a threshing device 4 is mounted on the left rear portion of the body frame 1, and a grain storage device is mounted on the right rear portion of the body frame 1. 5, and further includes a driving unit 7 provided at the right front portion of the body frame 1, a boarding operation unit 8 formed above the driving unit 7, and the like.

[Configuration of transmission system of each device]
The transmission system for the crawler type traveling device 2 and various devices on the body frame 1 is configured as follows.
As shown in FIG. 3, the prime mover 7 mounted on the machine body frame 1 is provided with an engine 70, and is arranged in a posture in which the axial center direction of the output shaft 70 a of the engine 70 is left and right. The transmission from the engine 70 to the left and right crawler type traveling devices 2 is driven from the left end portion of the output shaft 70a of the engine 70 projecting toward the left and right central portion of the machine body. It is carried out through a transmission system for traveling.
The traveling transmission system includes a belt-type transmission 15, a hydrostatic continuously variable transmission 16 provided as a main transmission, and a gear-type transmission (not shown) incorporated in the transmission case 17 as an auxiliary transmission. , Etc.

  Each of the left and right crawler type traveling devices 2 swings a shift lever 80 provided in the boarding operation unit 8 in the front-rear direction, thereby switching between a stepless shift operation and a forward / reverse movement by the hydrostatic continuously variable transmission 16. In addition, the steering operation lever 81 provided in the boarding operation unit 8 is swung in the left-right direction, so that the gear-type transmission in the mission case 17 moves straight, and the left and right are turned slowly. It is configured to be able to switch between a state and a left and right sudden turning state.

The chopping and conveying device 3 is configured such that the power after shifting by the hydrostatic continuously variable transmission 16 is transmitted via the one-way clutch 16a, the belt tension type reaping clutch 30, and the like, so The cutting and conveying device 32, the cereal conveying device 33, and the like are driven, and with the traveling of the machine body, the plurality of weeding tools 34 mounted on the front end of the planted cereal halves are planted, and each pulling device 31 causes the planted culm after weeding, the cutting device 32 cuts the planted side of the planted culm, and the culm transporting device 33 lays the cut cereal from the standing posture and switches it to the posture. It is configured to be conveyed toward the rear threshing device 4, and the steering operation lever 81 is swung in the front-rear direction so that the lifting and conveying device 3 can be moved up and down by the operation of the lift cylinder 35. Become That.
In addition, when the cutting speed in this cutting and conveying apparatus 3 wants to change greatly not only according to the stepless speed change by the hydrostatic continuously variable transmission 16 but also according to the conditions of the field and the state of lying of the stems and the like. Is configured so that the shift operation of the shift gear can be performed by a shift operation of the shift gear by the cutting transmission mechanism 36 constituted by a dedicated gear transmission mechanism installed in the transmission case 17.

  The threshing device 4 is driven by the power supply from the engine 70 transmitted through the transmission belt 71 and the belt tension type threshing clutch 18, and the handling cylinder 42 is driven. A known structure for handling and processing the head side of the cereal to be fed and supplying the grain obtained by the sorting process to the grain tank 51 of the grain storage device 5 through the first recovery screw 46 or the like It is configured.

  The feed chain 41 is configured so that the power from the engine 70 is transmitted by the transmission system branched from the transmission system to the threshing device 4 by the transmission belt 72 and via the tension clutch type feed chain clutch 19. It is. Then, the feed chain clutch 19 is arbitrarily operated to drive the threshing device 4 at a timing different from the driving start or end time.

  The grain storage device 5 includes a grain tank 51 and a grain discharge auger 52, and is configured such that the power of the engine 70 is transmitted to the grain discharge auger 52. That is, the transmission belt 54 is stretched over the input portion 53 of the grain storage device 5 from the portion of the output shaft 70a of the engine 70 that protrudes from the right lateral side toward the outer side of the machine body. A belt tension type grain discharging clutch 50 for turning on and off the power transmission is provided.

The Glen tank 51 has a working position where the whole is located behind the engine 70 around the longitudinal axis y provided at the rear part thereof, and a front part of the Glen tank 51 projects outwardly to the right of the fuselage frame 1 so that the rear side of the engine 70 It is configured to be able to swing and displace over a maintenance position that opens the position, and to be able to hold the position at the work position and the maintenance position by a lock mechanism (not shown).
The screw conveyor 55 and the input portion 53 for the grain discharge auger 52 provided at the bottom of the Glen tank 51 that swings and displaces in this way allow the Glen tank 51 to swing around the longitudinal axis y. It has a disengagement structure.

That is, as shown in FIG. 3, the input pulley 56 on which the transmission belt 54 is stretched, and the transmission shaft 57 that is spline-fitted to the input pulley 56 so as to be integrally rotatable and relatively slidable are provided in the machine body. It is supported by a bearing bracket 10b provided on the frame 1 side.
The power transmitted to the transmission shaft 57 is transmitted to an input transmission shaft 58 that is engaged and disengaged with respect to the transmission shaft 57, and the bevel gear 58 a of the input transmission shaft 58 and the screw conveyor 55 It is configured to be transmitted to the screw conveyor 55 and the grain discharging auger 52 via a bevel gear 55a provided on the shaft end side.
The input transmission shaft 58 is supported on the Glen tank 51 side, and includes a recessed engagement portion 58b that can be inserted into and removed from the transmission shaft 57, while the rotational power from the transmission shaft 57 is transmitted. Since it can be inserted and removed in the axial direction, engagement and disengagement associated with the swing of the Glen tank 51 around the longitudinal axis y can be allowed.
Reference numeral 59 in the drawing denotes a pressing spring for pressing and urging the transmission shaft 57 toward the input transmission shaft 58.

[Composition of threshing unit]
As shown in FIG. 4, the threshing device 4 includes a feed chain 41 on the left outer side of the threshing chamber case 40, and a handling cylinder 42 is provided in the upper portion inside the threshing chamber case 40, and selection is performed on the lower portion thereof. A recovery unit 4A is provided.
In the threshing chamber case 40, the handling cylinder 42 is supported so as to be rotationally driven around a longitudinal axis a1, and a receiving net 43 is laid so as to cover the lower side of the handling cylinder 42 from below with a predetermined interval. Yes.

In the sorting and collecting unit 4A, on the upper side of the swing sorting frame 44 formed in a rectangular shape in plan view, a rough sorting grain pan 44a, a coarse sorting first chaff sheave 44b, a coarse sorting first Strollac 44c, A second chaff sheave 44d for sorting and a second Strollac 44e for coarse sorting are provided, and a fine pan 44f and a fine sieve 44g for fine sorting are provided on the lower side of the swing sorting frame 44. It is configured.
The front end portion of the swing sorting frame 44 is supported by the threshing chamber case 40 via a pair of left and right swing arms. The rear end portion of the swing sorting frame 44 is supported by the threshing chamber case 40 via an eccentric cam type drive mechanism 45.

  A first recovery screw 46 is provided below the fine sorting grain pan 44f to carry the recovered single-grained grains toward the grain tank 7, and below the end of the second chaff sheave 44d for coarse selection. A second recovery screw 47 is provided for transporting the recovered second item toward the second processing path (not shown). Similar to the drive mechanism 45, the power transmitted to the carp 6 is transmitted to the first recovery screw 46 and the second recovery screw 47 via belt transmission type transmission mechanisms 73 and 74.

  On the front side of the machine body from the oscillating sorting frame 44, there is disposed a tang 6 for blowing the sorting wind for performing wind sorting in the sorting and collecting unit 4A. It is supported by a Kara case 6A provided at the front lower part of the threshing chamber case 40 so that the rotation driving centered on it is possible.

  Cut straws and the like that have not been leaked in the sorting and collecting unit 4A are discharged out of the machine from a dust outlet 49 formed behind the swing sorting frame 44. The waste dust and the like blown toward the rear upper part of the swing sorting frame 44 by the sorting wind from the Kara 6 is discharged to the outside by the action of the dust exhaust fan 48 disposed above the rear part of the swing sorting frame 44. The Although not shown, the power transmitted to the tang 6 is transmitted to the dust exhaust fan 48 via belt transmission type transmission mechanisms 73 and 74 as in the case of the drive mechanism 45 and the like.

  As shown in FIG. 1 and FIG. 2, the rear portion of the threshing device 4 is shredded into a long straw discharge state in which the waste straw transported by the waste straw transport device 75 is discharged outside the machine as a long straw. A waste straw treatment device 76 configured to be able to be switched to a shredded discharge state to be discharged outside the machine is provided. Similar to the drive mechanism 45 and the like, the power transmitted to the carp 6 is transmitted to the waste straw processing device 76 via belt transmission type transmission mechanisms 73 and 74.

[Composition of Karatsu]
The configuration of the Kara 6 will be described in detail.
Power from the engine 70 is transmitted to the carp 6 via the threshing clutch 18 and a belt transmission type transmission mechanism 72. The power transmitted to the carp 6 is transmitted to the drive mechanism 45 through belt transmission type transmission mechanisms 73 and 74 arranged on the left side of the threshing device 4. With this power, the drive mechanism 45 swings and drives the swing selection frame 44 in the front-rear direction. By this swinging drive, the swing sorting frame 44 is configured to perform a sieve sorting process on the threshing processed product.

  As shown in FIGS. 5 and 6, the carp 6 includes an input pulley 60 </ b> A on one end side (end portion on the center side of the machine body) of the rotating shaft 60 to which power from the engine 70 is transmitted, and the other end side (machine body). An output pulley 60B is provided at the left end). The belt transmission type transmission mechanism 72 is stretched so that the power on the engine 70 side is transmitted to the input pulley 60A. Further, as shown in FIG. 3, the output pulley 60B includes transmission belt transmission type transmission mechanisms 73 and 74 for transmitting power to the first recovery screw 46 and the second recovery screw 47 and the drive mechanism 45. It is stretched.

  Further, the dynamic belt transmission type transmission mechanisms 73 and 74 that are stretched around the output pulley 60B are provided with a long straw discharge state in which the waste straw is discharged outside the machine at the rear part of the threshing device 4. The driving mechanism 45 is loaded with a driving force on the waste chain processing device 76 configured to be able to be switched to a shredded release state that is shredded and released to the outside of the machine, and the feed chain 41. The waste straw treatment device 76 and the feed chain 41 are also linked together.

The wing piece 61 of the tang 6 of the present invention is attached to the rotating shaft 60 to which power is transmitted in this way via the wing piece support mechanism 62 as follows.
As shown in FIGS. 6A, 6 </ b> B, and 6 </ b> C, a short cylindrical fixed connecting body 63 that is closely fitted to the rotary shaft 60 at a central position in the axial direction of the rotary shaft 60. , And are attached in a state in which axial movement and relative rotation are prevented via the fastening bolt 64. A cylindrical fitting body 65 having an inner diameter slightly larger than the outer diameter of the rotating shaft 60 is positioned on both sides of the short cylindrical fixed connecting body 63, and a minute gap is formed between the outer peripheral surface of the rotating shaft 60. In the state having s, the cylindrical fitting body 65 is fixed to both ends of the fixed connecting body 63 by welding.
A flat plate-like arm 66 that connects the tubular fitting body 65 and the blade piece 61 is welded to the end of the tubular fitting body 65 opposite to the side to be joined to the fixed coupling body 63. It has become. As shown in FIG. 6 (a), the arm 66 is formed in a cross shape in a side view, and the cylindrical fitting body 65 is inserted through a central portion of the arm 66 to form a flat plate member with the blade piece 61. The connecting portion is formed by being partially bent in a direction orthogonal to the flat plate portion. The bent portion 66a is detachably bolted in a state where the bent portion 66a is in contact with the back surface of the wing piece 61.

In other words, the blade support mechanism 62 is configured by a combination of the fixed coupling body 63, the cylindrical fitting body 65, and the arm 66, and is rotated by the cylindrical fitting body 65 and the fixed coupling body 63. A connecting portion A for power transmission is configured, and the cylindrical fitting body 65 and the arm 66 constitute a support portion B for maintaining the posture of the blade piece 61.
A minute gap s formed between the outer peripheral surface of the rotating shaft 60 and the inner peripheral surface of the cylindrical fitting body 65 having an inner diameter slightly larger than the outer diameter of the rotating shaft 60 is a rotating shaft 60. A gap s for allowing a relative displacement between the rotating shaft 60 and the cylindrical fitting body 65 due to twisting or bending of is formed.

  The fixed connecting body 63 can be inserted into and removed from the rotating shaft 60 by sliding in the axial direction with respect to the rotating shaft 60 in a state where the tightening bolt 64 is loosened, but is relatively dense in the radial direction. And the wing piece 61 can be arranged in an axially symmetric state around the axis of the rotary shaft 60.

The fixed connecting body 63 has a certain length in the axial direction of the rotary shaft 60, and the fastening bolt 64 for positioning the fixed connecting body 63 is fixedly connected as shown in FIG. 5 and FIGS. 6 (b) and 6 (c). The body 63 is provided at two locations slightly apart from each other in the axial direction and the circumferential direction. However, in FIG. 5 and FIGS. 6B and 6C, for the sake of convenience, the tightening bolt 64 is separated from two places (FIG. 6B) separated in the circumferential direction and separated in the axial direction. It is shown in two places (FIG. 6C).
As described above, the fixed connector 63 itself has a certain length in the axial direction, and the fastening bolts 64 are also provided with a certain distance. Therefore, strictly speaking, when twisting or bending occurs on the rotating shaft 60, it cannot be said that very slight twisting or bending may occur. However, the amount of twist generated within the range of the length and interval The amount of bending is not an amount detected as a distortion that affects the strength of the blade support mechanism 62 but is negligible.
Therefore, in the present invention, as long as it is negligible in this way, even if it has a certain length in the axial direction and a certain distance between bolts, the connecting portion with the rotary shaft 60 is “one place in the axial direction”. ".

[Configuration of Airframe Frame]
As shown in FIGS. 7 to 9 , the body frame 1 intersects with a pair of left and right main frames 10, 10 in the shape of a square pipe that is long in the front-rear direction, and in a direction transverse to the main frames 10, 10 in the left-right direction. It is formed in a lattice frame shape with a large number of lateral frames 11 mounted and installed in a state and front and rear side frames 12 mounted and installed on the outer end side of the machine body of the horizontal frame 11. In addition, a pair of front and rear arched frames 13 and 13 are erected and connected between the left and right main frames 10 and 10.

On the front end side of the left and right main frames 10, 10, there is a mounting boss portion 10a with respect to a mounting shaft of a link member (not shown) for moving the track frame 2A of the left and right crawler type traveling device 2 up and down separately. It is provided with, over between the arched frame 13 and the mounting boss portion 10a, and their mounting boss portion 10a and a presence position of the arched frame 13 are integrally coupled to the previous SL mainframe 10,10 A reinforcing connecting member 14 is provided.

[ 1 of another embodiment]
In the best embodiment, the example in which the fixed coupling body 63 and the cylindrical fitting body 65 are configured by separate members and welded and integrated is shown, but the present invention is not limited to such a structure. Both are connected to each other with a fitting structure and bolted in the fitted state, or the fixed coupling body 63 and the cylindrical fitting body 65 are engaged with each other at the abutting end so that the rotational power is transmitted. At the same time, a soft material capable of elastic deformation to some extent is attached to the inner peripheral side of the cylindrical fitting body 65, and corresponds to the gap s between the outer peripheral surface of the rotating shaft 60 and the inner peripheral surface of the cylindrical fitting body 65. Alternatively, a portion capable of relative displacement may be provided.

[ Second embodiment]
The fixed coupling body 63 and the cylindrical fitting body 65 may not be configured as separate members, but the fixed coupling body 63 and the cylindrical fitting body 65 may be formed as a single body having different inner diameters. .

[ 3 of another embodiment]
The inner diameters of the fixed connecting body 63 and the cylindrical fitting body 65 are formed to have the same diameter, and the outer diameter on the rotating shaft 60 side is made different at portions corresponding to the fixed connecting body 63 and the cylindrical fitting body 65. A gap s may be formed between the inner peripheral surface of the cylindrical fitting body 65 and the outer peripheral surface of the rotating shaft 60.

[ 4 of another embodiment]
The rotary shaft 60 of the tang 6 is not limited to the input pulley 60A and the output pulley 60B provided on both ends, and the input pulley 60A and the output pulley 60B are provided on one end of the rotary shaft 60. It may be. Alternatively, a structure that includes only the input pulley 60A and does not include the output pulley 60B may be employed.

Overall side view of self-removing combine Overall plan view of self-decomposing combine Schematic diagram showing the transmission system Schematic side view showing the threshing device part Front view showing the Kara part Sectional drawing which shows the cross section in the axial direction and radial direction in the VI-VI line cross section in FIG. 5, and a fixed connector part. Plan view showing the fuselage frame Sectional drawing which shows the VIII-VIII line cross section in FIG. Front view showing the fuselage frame

DESCRIPTION OF SYMBOLS 1 Airframe frame 4 Threshing device 5 Grain storage device 6 Dwarf 60 Rotating shaft 61 Wing piece 62 Wing piece support mechanism 63 Fixed connection body 65 Cylindrical fitting body s Minute gap A Connection part B Support part

Claims (3)

A threshing device tang with a tang that blows a sorting wind for wind selection processing with respect to a sorting and collecting part of the threshing device,
The tang is connected to a rotating shaft to which power on the driving side is input, a blade piece that is located radially away from the rotating shaft, and the rotating shaft and the blade piece are connected to transmit the rotating power. A wing piece support mechanism,
The wing support mechanism, the connection points for a rotary power transmission for said rotary shaft and one wing, Ri Oh provided only in one location in the axial direction of the rotary shaft,
The wing piece support mechanism includes a single connecting portion for transmitting rotational power to the rotating shaft, and includes a plurality of supporting portions that support the wing pieces at locations away from the connecting portion in the axial direction of the rotating shaft. winnowing fan of Tei Ru threshing apparatus. The wing piece support mechanism includes a cylindrical fitting body that is externally fitted to the rotating shaft, a fixed coupling body that fixes the cylindrical fitting body in a non-rotating state with respect to the rotating shaft, and extends from the cylindrical fitting body. and an arm coupled to the wing, constitutes a connecting portion for a rotary power transmission between the fixed connection body and the tubular fitting member, according to claim 1 which constitutes a support portion between the cylindrical fitting portion and the arm Karatsu of the threshing device described. The blade support mechanism includes a cylindrical fitting body on both sides of the fixed coupling body, and a predetermined gap between the cylindrical fitting body and the rotating shaft is provided between the inner peripheral surface of the cylindrical fitting body and the outer peripheral surface of the rotating shaft. The tang of the threshing device according to claim 2, wherein a gap allowing a relative displacement within the range is formed.

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