JP3802466B2 - Combine working lever structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combine working portion lever structure that performs clutch operation of a threshing portion and a pretreatment portion by a single working portion lever inserted through a guide groove.
[0002]
[Prior art]
Conventionally, as shown in Japanese Utility Model Publication No. 58-50832, a combine that performs a clutch operation of a pre-processing unit and a threshing unit provided on a traveling machine base by a working unit lever inserted into a lever guide groove of a control unit is already known. It has been.
In the working part lever structure shown in this publication, the guide groove is formed into a crank-shaped (saddle-shaped) groove through an operation change path provided with a lever regulating part in the threshing part clutch path and the pretreatment part clutch path. The clutch mechanism of the threshing part is operated primarily by bringing the part lever into contact with the lever regulating part at the end of the threshing part clutch path from the clutch disengagement position of the threshing part and the pretreatment part, Activate.
[0003]
Further, the clutch of the preprocessing unit is driven in the state where the threshing unit is driven by changing the path from the position where the threshing unit is engaged via the operation change path and performing secondary operation to the position where the preprocessing unit is engaged via the preprocessing unit clutch path. The mechanism is turned on and the cutting and threshing work is performed while driving both the threshing unit and the pretreatment unit.
And the operation of returning the working unit lever when the drive of the threshing unit and the preprocessing unit is turned off is performed by operating the working unit lever to the operation change path from the position where the preprocessing unit clutch is engaged via the preprocessing unit clutch path. Then, from the position where the threshing portion clutch is located on the operation change path, the clutch is operated to the both clutch disengaging positions via the threshing portion clutch path, and the preprocessing portion and the threshing portion are sequentially turned off.
[0004]
[Problems to be solved by the invention]
However, the working part lever structure configured as shown in the above publication has the shape of the guide groove through which the working part lever is inserted, the threshing part clutch path and the pretreatment part clutch path provided with an operation change path provided with a lever restricting part. If you want to cut the pretreatment part and the threshing part instantaneously, move the working part lever from the pretreatment part clutch path to the lever restriction part position of the operation change path once to the side. Lateral operation toward the bowl and moving to the threshing part clutch path, it is necessary to put both clutches in the disengaged position. There are drawbacks such as contacting the working lever to the guide body of the guide groove of the road.
Therefore, when there is clogging of the cereals on the cutting and threshing path, or when foreign matter is mixed in the threshing part, the threshing part cannot be stopped urgently, and problems such as clogging increase.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the working part lever structure of the combine according to the present invention firstly forms a threshing part clutch path 70, a pretreatment part clutch path 71 and a lever restricting part 72 through an operation change path 75. The working part lever 17 is inserted into the guide groove 60, and the working part lever 17 is primarily moved from the clutch disengaging position K of the threshing part 5 and the pretreatment part 3 to the threshing part clutch entering position T of the threshing part clutch path 70. By operating, the clutch mechanism 26 of the threshing unit 5 is entered and operated, and from the threshing unit clutch engagement position T to the pretreatment unit clutch engagement position M via the operation change path 75 and the pretreatment unit clutch path 71. By operating, the clutch mechanism 27 of the pretreatment unit 3 is entered and operated, and the working unit lever 17 is returned to operate the clutch of the pretreatment unit 3 and the threshing unit 5. In a combine that sequentially turns off the structures 27 and 26, the two clutch disengages without passing through the lever restricting portion 72 of the operation change path 75 from the pretreatment section clutch path 71 when the working section lever 17 is returned to the guide groove 60. A feature is that a lever melting passage 73 for returning to the position K is formed.
[0006]
Secondly, by pushing the working part lever 17 forward from both clutch disengagement positions K, the guide groove 60 is provided in the longitudinal direction of the machine body so as to sequentially enter and operate the threshing part 5 and the pretreatment part 3, and The guide groove 60 is characterized in that a lever melting passage 73 having an accommodation guide surface 74 for guiding the working portion lever 17 in an oblique direction is formed from the preprocessing portion clutch path 71 toward the both clutch disengagement positions K. Yes.
[0007]
Third, the working portion lever 17 is positioned and supported by the detent mechanism 59 at the threshing portion clutch entering position T of the guide groove 60.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a combine provided with a lever device 2 as a working part lever structure according to the present invention in the transmission system shown in FIG. 2, and a conventional machine equipped with a crawler type traveling device (not shown) The pre-processing unit (reaping unit) 3 and the threshing unit 5 which are working units are provided in the front-rear direction, and the control unit 6 is provided on the other side of the threshing unit 5 behind the pre-processing unit 3. A Glen tank 7 is arranged, and an engine 8 is installed below the driver seat 9.
With this configuration, the planted culm is cut by the preprocessing unit 3, and the chopped culm is transferred to the feed chain 10 of the threshing unit 5 via a rear conveyance device (not shown), and threshing is performed. Housed in the Glen tank 7.
[0009]
The steering unit 6 has a front control panel 11 and a left lever operation unit 12 formed in an L shape in plan view. The control panel 11 is provided with a steering operation lever 13 and monitor devices. The travel clutch pedal 14 is disposed in the front.
The lever operation unit 12 has a main transmission lever 15 and an auxiliary transmission lever 16 provided on the front side, and a working unit lever 17 according to the present invention is disposed behind the main operation lever 17 at a side position of the driver seat 9. The clutch operation of the pretreatment unit 3 and the threshing unit 5 is performed by the operation in the front-rear direction. Reference numeral 19 denotes a soot processing portion lever of the Glen tank 7.
[0010]
As shown in FIG. 2, the transmission system for performing each clutch operation includes a traveling transmission 20 of the traveling unit transmission system, a work input shaft 21 of the threshing unit transmission system, and a preprocessing unit transmission from the engine output shaft 8 a of the engine 8. The pre-processing transmission 22 of the system and the soot processing unit transmission system are driven, and these transmission systems are transmitted via the belt tension clutch type clutch mechanisms 25, 26, 27, etc. operated by the respective levers. .
As a result, the engine output shaft 8 a drives the traveling transmission 20 with the main transmission lever 15 and the auxiliary transmission lever 16 through the clutch mechanism 25 operated by the traveling clutch pedal 14.
[0011]
The engine output shaft 8a drives a work input shaft 21 of a working unit transmission system including a threshing unit transmission system and a preprocessing unit transmission system via a clutch mechanism 26.
The threshing part transmission system inputs from the work input shaft 21 to the blower fan shaft 29, and drives the handling cylinder, the swing sorting part and the like of the threshing part 5.
On the other hand, the preprocessing unit transmission system drives the preprocessing unit 3 by the clutch mechanism 27 from the work input shaft 21 via the preprocessing transmission 22 including the preprocessing unit HST30. The feed chain 10 provided along the mouth of the threshing unit 5 is driven from a chain transmission shaft 31 that is transmitted and received by the clutch mechanism 26 on the transmission upper side of the clutch mechanism 27.
[0012]
Next, the clutch mechanisms 25, 26, and 27 that control the power of each transmission system will be described. The clutch mechanisms 25, 26, and 27 are all configured by the same mechanism, and this configuration will be described only for the clutch mechanism 26 of the working unit transmission system shown in FIG.
That is, the clutch mechanism 26 includes a belt 35 that is wound around the output pulley 32 of the engine output shaft 8a and the input pulley 33 of the work input shaft 21, a tension pulley 36 that tensions the middle portion of the belt 35 so as to be loosened and loosened, A clutch actuating part 39 that actuates the clutch pulley 38 to turn on and off the tension pulley 36 based on ON / OFF of the switch 37 accompanying the operation of the working part lever 17 described later in FIG.
[0013]
With this configuration, when the working portion lever 17 is primarily operated (operation for entering the threshing portion) in the forward direction indicated by the solid arrow in FIG. 4 to reach the standing posture in FIG. The clutch arm 51 that supports the tension pulley 36 is pulled against the tension spring 52 via the rolling reduction gear and the wire and the like, and the belt 35 is pressed against the tension spring 36 to enter the belt transmission. To.
When the working lever 17 is operated to return in the direction of the dotted arrow in the figure and the switch 37 is turned OFF, the clutch motor 38 is rotated in reverse to release the tension of the cooperative operating member 50, so that the spring 52 is interposed via the clutch arm 51. The tension pulley 36 releases the pressing force of the belt 3 and turns off the transmission.
[0014]
On the other hand, the clutch mechanism 27 of the preprocessing unit transmission system is configured in the same manner as the clutch mechanism 26, and the belt transmission is turned on and off by the operation of the working unit lever 17. In this case, as shown in FIG. The switch 37a provided on the other side of the switch 37 is performed based on being turned ON / OFF by the secondary operation (operation for entering the preprocessing unit) and the return operation of the working unit lever 17.
[0015]
Next, the structure and operation mode of the lever device 2 and the working unit lever 17 shown in FIGS. 4 to 5 will be described.
In the lever device 2, a guide body 53 formed in a frame shape with a plate member is installed in the lever operation unit 12, and is provided at a base of the working unit lever 17 on a mounting bracket 55 standing inside the guide body 53. The lever substrate 57 is pivotally supported via a support shaft 56 so as to be able to rotate back and forth.
In addition, the lever substrate 57 constitutes a joint portion 17a by connecting the working portion lever 17 formed in a cross-sectional plate shape with a horizontal shaft 18, and the working portion lever 17 is laterally (laterally) with the horizontal shaft 18 as a fulcrum. It is pivotally supported.
[0016]
Further, the working part lever 17 is configured such that the lever substrate 57 can be supported in postures at respective operation positions via a detent mechanism 59 described later, and the working part lever 17 is provided with a clutch in a guide groove 60 formed in the guide body 53. Cutting positions of the mechanisms 26 and 27 (hereinafter referred to as both clutch disengaging positions K), engaging positions of the clutch mechanism 26 (hereinafter referred to as threshing section clutch engaging positions T), and engaging positions of the clutch mechanism 27 (hereinafter referred to as pre-processing section clutches) It can be operated so as to be capable of positioning support.
[0017]
The detent mechanism 59 includes a holder 61 erected from the mounting bracket 55 below the lever substrate 57 in the vertical direction of the support shaft 56, a positioning ball 62 biased and supported by a spring (not shown) in the holder 61, Locking portions 63, 64, 65 for positioning and supporting the working lever 17 by being selectively engaged with the balls 62 and carved on the lower peripheral edge of the semicircular arc centered on the support shaft 56 of the lever substrate 57. And consists of
[0018]
Each of the locking portions 63, 64, 65 is based on the operation of the working portion lever 17. When the locking portion 63 is first engaged with the ball 62, the working portion lever 17 is moved to the both clutch disengaging position K of the guide groove 60. When the holding portion 64 is engaged with the ball 62, the working portion lever 17 is held at the threshing portion clutch engagement position T shown by the solid line in FIG. The lever 17 is held in the preprocessing portion clutch engagement position M while the threshing portion clutch engagement is made effective.
[0019]
The engaging portions 63, 64, 65 are engaged with the ball 62 by operating the working portion lever 17 and pressing the ball 62 downward against the spring in the holder 61. Each switching position can be discriminated by the sense of hand operation by the operation resistance of 17 and the appropriate operation can be smoothly performed, and the confirmation of the operation position can also be grasped by the relationship between the working unit lever 17 and a guide groove 60 described later. it can.
[0020]
In this configuration, a switch actuating member 67 is integrally provided on the lever substrate 57, and the switch 37 for the clutch mechanism 26 of the threshing unit 5 and the clutch of the pretreatment unit 3 are provided on both sides of the switch actuating member 67. A switch 37a for the mechanism 26 is attached to the mounting bracket 55 and installed.
As a result, the switch operating member 67 rotated about the support shaft 56 by the operation of the working portion lever 17 has cam-shaped operating surfaces formed on the outer peripheral surface thereof in an irregular shape, so that the operation positions K, T, At positions corresponding to M, the switches 37, 37a are turned on and off to control the operation and stop of the clutch motor 38 provided in each clutch mechanism 26. The clutch mechanism 26 of the threshing unit 5 and the clutch mechanism 27 of the preprocessing unit 3 are controlled. Turn on the power.
In other words, the convex operating surface 68 formed on the switch operating member 67 is such that the working portion lever 17 turns on the switch 37 in the operating range from the threshing portion clutch engagement position T to the pretreatment portion clutch engagement position M, and the other operation. The surface 69 is configured to turn on the switch 37a when the working unit lever 17 is operated to the pre-processing unit clutch engagement position M.
[0021]
Next, the guide groove 60 will be described with reference to FIGS. The guide groove 60 drilled in the front-rear direction in the guide body 53 is operated linearly with the working lever 17 forward (primary operation) with the both clutch disengagement position K positioned rearward in plan view. ) And the threshing portion clutch path 70 that reaches the threshing portion clutch engagement position T, and the working portion lever 17 is linearly operated (secondary operation) from the threshing portion clutch engagement position T toward the front side, and the preprocessing portion A pre-processing section clutch path 71 that reaches the clutch engagement position M is formed in a series by being displaced left and right via an operation change path 75 having a lever restricting section 72, a lever melting path 73, and an accommodation guide surface 74 described below. is doing.
[0022]
That is, as shown in the figure, the operation change path 75 is at the threshing part clutch engagement position T (end point of the primary operation) of the threshing part clutch path 70 and beyond that in the primary operation direction of the working part lever 17. A lever restricting portion 72 that prevents the movement by contacting the working portion lever 17 is formed.
Further, the working lever 17 is obliquely directed from the pretreatment section clutch path 71 toward the both clutch disengaging positions K of the threshing section clutch path 70 on the lower side of the operation change path 75 facing the lever regulating section 72. By providing an accommodation guide surface 74 that guides to the side, a bent groove is formed in which a lever fusion passage 73 having a wide groove shape is formed on the side.
[0023]
As a result, the lever fusion passage 73 formed by providing the accommodation guide surface 74 that is guided obliquely from the pretreatment portion clutch path 71 toward the both clutch disengagement positions K side allows the accommodation guide surface to be accommodated when the operation portion lever 17 is returned. 74 smoothly returns to the starting end side of the threshing portion clutch path 70, that is, both clutch disengagement positions K, and the working portion lever 17 is placed at a predetermined position of the threshing portion clutch path 70, and both sides are formed by slits 79 of a cover member 77 described later. In the supported state, the re-operation from the both clutch disengagement position K to the threshing portion clutch engagement position T side is facilitated.
[0024]
Therefore, the working part lever 17 of the lever device 2 configured as described above reaches the threshing part clutch entering position T of the threshing part clutch path 70 by the primary operation, and the clutch mechanism 26 is NO to drive the threshing part 5. The posture is maintained through the detent mechanism 59.
At this time, since the threshing unit 5 is driven while the preprocessing unit 3 is stopped, the combine 1 can perform a manual threshing operation or the like.
[0025]
Next, when the operation part lever 17 is changed to the side (right side) through the operation change path 75 from the threshing part clutch engagement position T and then subjected to the secondary operation, the preprocessing part clutch is passed through the preprocessing part clutch path 71. At the entrance position M, the posture is maintained through the detent mechanism 59, the clutch mechanism 27 is turned on in the driving state of the threshing unit 5, and the preprocessing unit 3 is driven. Thereby, the combine 1 can drive the pre-processing part 3 and the threshing part 5 simultaneously, and can perform cutting and threshing work.
[0026]
Then, the working portion lever 17 sequentially turns off the clutch mechanisms 27 and 26 of the pretreatment portion 3 and the threshing portion 5 by the return operation in the direction of the dotted line arrow shown in FIG.
That is, the working unit lever 17 stops the preprocessing unit 3 and puts only the threshing unit 5 into a driving state by a return operation of the preprocessing unit clutch path 71 from the preprocessing unit clutch engagement position M to the threshing unit clutch engagement position T. In this state, only the pre-processing unit 3 is temporarily stopped from the mowing and threshing operation, so that it is possible to perform a turning operation of the machine body or a handling operation.
Next, the threshing unit 5 is cut in the cut state of the pretreatment unit 3 by the return operation of the threshing unit clutch path 70 from the threshing unit clutch engagement position T to the both clutch disengaging positions K.
[0027]
The guide groove 60 has a flexible plate-like cover member 77 made of rubber or plastic material attached to the back side of the guide body 53 and closed, and is changed in operation with the threshing portion clutch path 70. By forming a series of slits 79 substantially at the center of the path 75 and the pre-processing section clutch path 71, the working section lever 17 is inserted into the slit 79 so that it can be operated back and forth.
Thereby, the working portion lever 17 is supported on both sides of the plate-like rod by the end face of the slit 79 of the cover member 77, and moves smoothly back and forth in the guide groove 60 while being buffered by the elasticity of the cover member 77. Moreover, since the slit 79 is joined to the working part lever 17 and the gap formed between them is made as small as possible, it prevents dust and dust generated during threshing work from entering the guide body 53 from above. In addition, hot air containing dust in the guide body 53 can be prevented from being blown into the interior of the control unit 6 covered with the cabin.
[0028]
The combine 1 configured as described above performs the cutting and threshing operation by driving the traveling unit transmission system, the pretreatment unit transmission system, the threshing unit transmission system, and the culling processing unit transmission system from the engine 9 via each clutch mechanism. At this time, the operation of the clutch mechanisms 26 and 27 of the threshing unit 5 and the pretreatment unit 3 is performed by a primary operation of pushing one working unit lever 17 inserted through the guide groove 60 forward from both clutch disengagement positions K. In the threshing portion clutch engagement position T of the threshing portion clutch path 70, the clutch mechanism 26 of the threshing portion 5 is entered and operated, and from the threshing portion clutch engagement position T via the operation change path 75 and the preprocessing portion clutch path 71. Then, the clutch mechanism 27 of the preprocessing unit 3 is engaged and operated by performing a secondary operation to the preprocessing unit clutch engagement position M.
[0029]
When the working unit lever 17 is operated to return from the preprocessing unit clutch engagement position M to the threshing unit clutch engagement position T via the preprocessing unit clutch path 71, the clutch of the preprocessing unit 3 remains enabled while the threshing unit 5 is driven. When the mechanism 27 can be turned off and released, the working lever 17 is positioned and supported on the operation change path 75 by the detent mechanism 59.
Next, when the operation unit lever 17 is operated to return to both clutch disengagement positions K via the threshing portion clutch path 70, the clutch mechanism 26 of the threshing portion 5 is turned off to completely stop the driving of the preprocessing portion 3 and the threshing portion 5. .
[0030]
In such a lever device 2, the working part lever 17 is pushed forward from both clutch disengagement positions K where the guide groove 60 having the lever melting passage 73 is provided at the rear part, and the threshing part 5 and the pretreatment part 3 are sequentially operated. Since the operation direction of the working unit lever 17 is matched with the backward pulling operation side that is easy for the operator to operate, the operation unit lever 17 can be easily and quickly turned in an emergency. .
[0031]
That is, when it is desired to cut the transmission of the pretreatment unit and the threshing unit almost simultaneously (instantaneously), when the pulling operation is quickly pulled backward from the pretreatment unit clutch engagement position M, the working unit lever 17 is As in the case of the thing, without the lateral operation from the preprocessing section clutch path 71 to the lever restricting section 72 side of the operation change path 75, after passing through the lever melting path 73, the threshing section clutch path 70 is directly transferred to both clutches. Since the switching operation can be quickly performed to the cutting position K, the threshing unit and the pretreatment unit can be stopped immediately, and an increase in trouble due to clogging of the threshing unit 5 or the like can be prevented.
[0032]
At this time, the lever fusion passage 73 formed by providing the accommodation guide surface 74 that guides the working portion lever 17 obliquely from the preprocessing portion clutch path 71 toward the both clutch disengagement positions K side is provided with the working portion lever 17. During the return operation, the flexible guide surface 74 smoothly returns to the starting end side of the threshing portion clutch path 70, that is, to both clutch disengagement positions K, and the working portion lever 17 is placed at a fixed position of the starting end of the threshing portion clutch path 70 to guide the member 50. In the state where both sides are supported by the slit 79, the re-operation from the both clutch disengagement position K to the threshing portion clutch engagement position T side is facilitated.
[0033]
Furthermore, since the working part lever 17 is positioned and supported by the detent mechanism 59 at the threshing part clutch-engaged position T, the working part lever 17 is stably positioned and supported at the threshing part clutch-engaging position T, and the pre-processing part. When shifting from the clutch path 71 to the threshing part clutch path 70, the switching of the working part lever 17 at the threshing part clutch-engaged position T is accurately performed as a hand sense that the detent mechanism 59 grips the working part lever 17 to the operator. Therefore, the operation portion lever 17 can be easily positioned to the position T with the threshing portion clutch.
[0034]
In the embodiment, the clutch mechanisms 26 and 27 that are turned on and off by the working portion lever 17 are of the belt tension pulley type that is actuated by the clutch motor 38. A clutch mechanism or a friction clutch mechanism can also be used.
[0035]
【The invention's effect】
Since the present invention constitutes the combine working portion lever structure as described above, the following effects can be obtained.
The working part lever is inserted into the guide groove formed through the operation change path with the threshing part clutch path, the preprocessing part clutch path, and the lever restricting part, and the working part lever is moved from both clutch disengagement positions of the threshing part and the preprocessing part. The threshing part clutch path is first operated at the position where the threshing part clutch is engaged, and the clutch mechanism of the threshing part is entered and operated, and from the position where the threshing part clutch is engaged, preprocessing is performed via the operation change path and the preprocessing part clutch path. Combined to operate the clutch mechanism of the pre-processing unit by performing a secondary operation at the position where the clutch is engaged, and to turn off the clutch mechanism of the pre-processing unit and the threshing unit sequentially by operating the lever of the working unit to return. In this case, both the clutches are moved through the guide groove without passing through the lever restricting portion of the operation change path from the preprocessing portion clutch path when the working lever is returned to the guide groove. By forming a lever melt passage that returns to the cutting position, if you want to instantaneously cut the pretreatment part and the threshing part, move the working part lever from the pretreatment part clutch path to the lever regulation part side of the operation change path. It can be quickly turned off without operation.
[0036]
Further, by pushing the working part lever forward from the clutch disengagement position, a guide groove is provided in the longitudinal direction of the machine body so that the threshing part and the pretreatment part are sequentially entered and operated, and the pretreatment part clutch is provided in the guide groove. By forming a lever fusion passage with a flexible guide surface that guides the working portion lever obliquely from the path toward the both clutch disengagement positions, the flexible guide surface of the working portion lever during the return operation is a pre-processing portion. Smoothly return from the clutch path to both clutch disengagement positions on the start side of the threshing part clutch path.
[0037]
In addition, the working part lever is positioned and supported by the detent mechanism at the position where the threshing part clutch is engaged in the guide groove, so that the working part lever can be stably positioned and supported at the position where the threshing part clutch is engaged, and the threshing part clutch is separated from the preprocessing part clutch path. When shifting to the path, the detent mechanism allows the operator to recognize the position where the threshing portion clutch is engaged, so that the working portion lever can be easily positioned to the position where the threshing portion clutch is engaged.
[Brief description of the drawings]
FIG. 1 is a plan view showing a main part of a combine equipped with a working part lever structure according to the present invention.
FIG. 2 is a transmission system diagram of the combine of FIG. 1;
FIG. 3 is a side view showing a configuration of a clutch mechanism.
FIG. 4 is a perspective view showing a partially broken structure of a working part lever structure.
FIG. 5 is a plan view showing a configuration of a guide groove.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Combine 2 Lever apparatus 3 Preprocessing part 5 Threshing part 6 Steering part 17 Working part lever 25,26,27 Clutch mechanism 53 Guide body 59 Detent mechanism 60 Guide groove 70 Threshing part clutch path | route 71 Preprocessing part clutch path | route 72 Lever control part 73 Lever interchange passage 74 Interchange guide surface 75 Operation change passage 77 Cover member 79 Slit K Both clutch disengagement position T Threshing portion clutch engagement position M Pretreatment portion clutch engagement position

Claims (3)

The working part lever (17) is inserted into the guide groove (60) formed continuously through the operation changing path (75), the threshing part clutch path (70), the pretreatment part clutch path (71), and the lever restricting part (72). Insert the working part lever (17) from the clutch disengagement position (K) of the threshing part (5) and the pretreatment part (3) to the threshing part clutch engagement position (T) of the threshing part clutch path (70). By performing a primary operation, the clutch mechanism (26) of the threshing section (5) is entered and operated, and the operation changing path (75) and the preprocessing section clutch path (71) are moved from the threshing section clutch entering position (T). The clutch mechanism (27) of the pre-processing unit (3) is engaged and operated and the working unit lever (17) is returned to the pre-processing unit clutch engagement position (M). , Pre-processing part (3) and threshing part 5) In the combine that sequentially turns off the clutch mechanisms (27), (26), the operation change path is changed from the pre-processing part clutch path (71) when the working part lever (17) is returned to the guide groove (60). The working part lever structure of the combine which formed the lever fusion path (73) which returns to both clutch disengagement positions (K), without passing through the lever control part (72) of (75). By pushing the working part lever (17) forward from the clutch disengagement position (K), the guide groove (60) is inserted into the machine body so that the threshing part (5) and the pretreatment part (3) are sequentially entered and operated. A flexible guide surface that guides the working portion lever (17) in an oblique direction from the pretreatment portion clutch path (71) toward the both clutch disengagement positions (K) in the guide groove (60). The working lever structure for a combine according to claim 1, wherein a lever melting passage (73) having 74) is formed. The working part lever structure of a combine according to claim 1 or 2, wherein the working part lever (17) is positioned and supported by the detent mechanism (59) at a position (T) in which the threshing part clutch enters the guide groove (60).

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