JP2010183923A - Method for harvesting by combine harvester and combine harvester used in the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for harvesting by a combine harvester designed to perform harvesting operation, while preventing thrusting or sinking of a reaping pre-treating unit into a farm field. <P>SOLUTION: Harvesting travel is carried out by bringing a lowering stopper means 8 acting on the reaping pre-treating unit 10 to be effective, and supporting the reaping pre-treating unit 10 at a connecting height floated from the ground surface to the set reaping height and allowing the reaping pre-treating unit 10 to perform the lifting operation with ground contact reaction force. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a harvesting method using a combine in which a pre-cutting processing unit is connected to a front part of a self-propelled aircraft so as to be movable up and down, and a combine used in the harvesting method.

As a harvesting method using a combine in which a pre-cutting processing unit is connected to a front part of a self-propelled machine body so as to be movable up and down, a method disclosed in, for example, Patent Document 1 has been proposed.
In the harvesting method shown in Patent Document 1, the control valve 31 of the elevating cylinder 14 is operated to the lowered position to lower the cutting part 3 (corresponding to the pre-cutting processing part) until the grounding body 25 comes in contact with the cutting part 3. The harvesting part 3 is harvested and moved while moving up and down following the undulation of the farm scene so that it is easy to avoid thrusting into the farm field.

Japanese Patent Laying-Open No. 2005-34051 (paragraphs [0028]-[0032], FIGS. 1, 13 and the like)

  In the above-described conventional harvesting method, if the farm field is weak, the pre-cutting processing unit is likely to sink into the mud, and there is room for improvement in this respect. Even if a balance spring that applies a lifting operation force to the mowing part is adopted so that the pre-cutting process part rises lightly by the ground reaction force, the pre-cutting process part stably follows the ground so that it does not easily bounce into the field. In order to do so, the ascending operating force applied by the balance spring cannot be made extremely strong, and it has been difficult to avoid sinking.

  The purpose of the present invention is to not only prevent the pre-cutting section from being pushed into the field due to the forward tilting of the self-propelled aircraft, but also to prevent the pre-cutting section from sinking into the mud. It is an object of the present invention to provide a harvesting method using a combine that can be operated, and a combine that can easily adopt this harvesting method.

In the first aspect of the invention, in the harvesting method by the combine in which the cutting pretreatment unit is connected to the front part of the self-propelled aircraft so as to be movable up and down,
Lowering stopper means for supporting the pre-cutting processing unit at a connection height that has floated to a set cutting height from the ground, allowing the pre-cutting processing unit to rise from the connection height by a ground reaction force from the ground. Harvest while running in the state.

  That is, since the harvesting travel is performed while the lowering stopper means supporting the pre-cutting processing unit from the ground to the connection height rising to the set cutting height is effective, the pre-cutting processing unit can be mud even if the field is weak. Harvesting can be carried out while floating and supporting so as not to sink.

  The descent stopper means that the pre-cutting part allows the pre-cutting part to rise from the connection height of the set cutting height by the ground reaction force from the ground. Even if the part comes in contact with the ground, the pre-cutting processing part rises due to the grounding reaction force, making it difficult to thrust into the field, and it is easy to avoid the cutting height becoming too low.

  Therefore, according to the first aspect of the present invention, it is possible not only to avoid the pre-cutting processing unit from entering the field and deforming or damaging it, but also to perform the harvesting work while suppressing the change in cutting height. Even in relatively weak fields, it is easy to avoid the pre-cutting processing unit sinking into mud and causing poor driving of the pre-cutting processing unit and soiling of the stems by mud adhering to the pre-cutting processing unit. Can be harvested. In addition, it is possible to obtain an advantageous operation surface so that the simple operation of using the lowering stopper means is sufficient.

  In the combine according to the second aspect of the present invention, the lowering stopper means for supporting the cutting pretreatment part connected to the front part of the self-propelled machine body so as to be movable up and down at the connection height that is raised from the ground to the set cutting height, The pre-cutting processing unit is configured and equipped to allow the pre-cutting processing unit to be lifted from the connection height by a ground reaction force from the ground.

  That is, since the descent stopper means is equipped, the descent stopper means can be operated without taking any special effort to prepare the descent stopper means. And, by operating the descent stopper means, the pre-cutting processing unit is supported by the connection height that has risen from the ground to the set cutting height, and even if the field is soft, it is difficult for the pre-cutting processing unit to sink into the mud. It is possible to travel while harvesting. The descent stopper means that the pre-cutting part allows the pre-cutting part to rise from the connection height of the set cutting height by the ground reaction force from the ground. Even if the part comes into contact with the ground, the pre-cutting processing part can be raised by the grounding reaction force so as not to be pushed into the field, and it is easy to avoid that the cutting height becomes too low.

  Therefore, according to the second aspect of the present invention, it is easy not to prevent the cutting pretreatment unit from entering the field and deforming or damaging it, and not only to suppress the change in cutting height, but also in a relatively soft field, It becomes easy to avoid that the pre-cutting processing unit sinks in the mud and the driving failure of the pre-cutting processing unit and the soil of the stems caused by the mud adhering to the pre-cutting processing unit occur. Moreover, it is possible to obtain an advantageous state in terms of operation so that a special labor for preparing the descending stopper means is not required.

  According to the third aspect of the invention, in the configuration of the second aspect of the invention, the lowering stopper means raises the pre-cutting processing section by supplying hydraulic oil, and the hydraulic oil is discharged by discharging the hydraulic oil. This is a hydraulic cylinder that lowers the pre-cutting processing unit.

  That is, by operating the hydraulic cylinder downward, the pre-cutting processing unit is lowered, and when the pre-cutting processing unit is lowered to the lowering work state and reaches the set cutting height, the hydraulic cylinder is operated to stop to The cylinder serves as a descent stopper means to support the pre-cutting processing unit at a connection height that has floated to the set cutting height from the ground, and to allow the pre-cutting processing unit to be lifted by the ground reaction force.

  Therefore, according to the third aspect of the present invention, before harvesting, the harvesting pretreatment unit is supported in a state where the cutting height is set to the ground, and the harvesting processing unit is allowed to rise due to the ground reaction force before harvesting. Operation can be performed simply by operating the hydraulic cylinder so that the processing unit is lowered from the ascending non-working state to the lowered working state of the set cutting height.

  According to the fourth aspect of the invention, in the configuration of the second or third aspect of the invention, the pre-cutting processing part is provided with a ground plane part that contacts the ground and receives a ground reaction force.

  That is, when the pre-cutting processing unit comes in contact with the ground, the grounding plane part contacts the ground, and even if the field is relatively soft, the ground reaction force is received in a state where it is difficult to sink into the ground due to the plane of the grounding plane part. Will rise.

  Therefore, according to the fourth aspect of the present invention, the muddy soil is less likely to adhere to the pre-cutting processing unit due to the ground reaction force in a state in which the pre-cutting processing unit is unlikely to sink into the ground due to the ground flat portion, It will be easier to avoid stalks and dirt.

  In the fifth aspect of the present invention, in any one of the configurations of the second to fourth aspects of the present invention, there is provided a balance spring that applies a lifting operation force to the pre-cutting processing portion at the connection height of the set cutting height. It is.

  That is, when the pre-cutting processing unit receives a grounding reaction force, the resultant force of the grounding reaction force and the lifting operation force applied by the balance spring raises the pre-cutting processing unit against the gravity of the pre-cutting processing unit. To do. As a result, when the pre-cutting processing unit is lifted by the ground reaction force, the pre-cutting processing unit is lifted by simply touching the ground for the size of the weight of the pre-cutting processing unit. It becomes difficult to sink.

  Therefore, according to the fifth aspect of the present invention, when the pre-cutting processing unit is grounded and lifted, it is difficult to sink into the ground. From this surface, mud does not easily adhere to the pre-cutting processing unit, and is caused by the attached mud. This makes it easier to avoid poor driving and stalk stains.

Side view of the entire combine Top view of the entire combine Explanatory drawing of harvesting method and hydraulic circuit Side view of balance mechanism Front view of balance mechanism Cross section of balance spring Side view of a weed cocoon explaining the range of action of the balance mechanism Side view of balance mechanism with spring pressure adjustment plate Front view of balance spring with spring pressure adjustment plate Side view of the pre-cutting section with the forced weeding device installed Front view with the forced weeding device installed in the pre-cutting section Side view of the descent detection switch placement section Front view of the descent detection switch placement section (A) is a side view showing the point of carrying the combine into the field, (B) is a side view showing the state where the pre-cutting processing unit is in contact with the field when the combine is carried in Side view showing the spring pressure adjustment procedure of the balance mechanism

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, a pre-cutting process is performed on a support stand 4 positioned at the front of a body frame 3 of a self-propelled aircraft equipped with a crawler type traveling device 1, a driving unit equipped with a driver seat 2, and the like. The base part of the pre-processing part frame 11 of the part 10 is connected rotatably, and the driving force of an engine (not shown) provided below the driver's seat 2 of the self-propelled machine body is applied to the transmission case of the pre-cutting processing part 10. It is configured to input the combined pre-processing unit frame 11 to drive the pre-cutting processing unit 10, and a threshing device 5 and a grain tank 6 are provided on the rear side of the machine body frame 3 to configure a combine. It is.

  This combine harvests rice, wheat and the like, and is a hydraulic cylinder having one end connected to the pre-processing section frame 11 of the pre-cutting processing section 10 and the other end connected to the cylinder bracket 3a of the body frame 3. When the hydraulic cylinder 8 is operated, the hydraulic cylinder 8 swings the pre-processing unit frame 11 up and down with respect to the body frame 3 around the axis X. The mowing pre-processing unit 10 is moved up and down into a lowering work state where the mowing device 12 is located near the ground and an ascending non-working state where the mowing device 12 and the like are raised upward from the ground. When the pre-cutting processing unit 10 is in the descending work state and the self-propelled machine is run, the pre-cutting processing unit 10 includes a plurality of cutting weeds 13 arranged in the horizontal direction at the bottom of the pre-cutting processing unit 10. The planted culm is divided into a planted culm to be harvested and a non-harvested planted culm by a weeding tool 14 supported at the front end, and a plurality of planted culms with a plurality of planting ridges to be harvested Of the cause paths 15 are divided and guided so as to be divided into the corresponding cause paths 15, and the planted culm introduced into each cause path 15 is caused by the cause device 16 corresponding to each cause path 15. The clipper-shaped reaping device 12 performs reaping processing, and the reaped cereal from the reaping device 12 is conveyed backward by the feeding device 17 to remove the threshing device 5. Supplied to the starting end of the feed chain 5a. The threshing device 5 supplies the tip side to a handling room (not shown) while holding the stock side of the harvested cereal rice cake in the rearward direction of the machine body by the threshing feed chain 5a, and rotating the tip side of the handling cylinder (not shown). Threshing is performed by (not shown). The grain tank 6 collects and stores the threshed grains conveyed from the threshing device 5.

  As shown in FIG. 3, the hydraulic cylinder 8 is configured as a single-acting cylinder, and the control valve V connected to the hydraulic cylinder 8 is switched to “up” so that the control valve V The pressure oil is supplied from the hydraulic pump P by the hydraulic oil, and is driven to the extension side by the hydraulic oil to raise the pre-cutting processing unit 10 and the control valve V is switched to “down”. The hydraulic oil is discharged by V, and is operated to the shortening side due to the weight of the pre-cutting processing unit 10 to lower the pre-cutting processing unit 10, and the control valve V is switched to “neutral”. The supply and discharge of the hydraulic oil are stopped by the control valve V, and the pre-cutting processing unit 10 is stopped so as not to descend from this operation position to an arbitrary operation position in the ascending non-working state or the descending working state.

  As a result, when the pre-cutting processing unit 10 is stopped at the connection height at which the cutting height by the cutting device 12 is the set cutting height, the hydraulic cylinder 8 moves the pre-cutting processing unit 10 from the connection height. It becomes a descent stopper that stops so as not to descend. Further, the hydraulic cylinder 8 is operated to the extension side due to the grounding reaction force when the pre-cutting processing unit 10 is grounded and receives a grounding reaction force in a state where it is a lowering stopper for the pre-cutting processing unit 10. Then, the pre-cutting processing unit 10 is allowed to be raised from the connection height of the set cutting height by the ground reaction force.

  As shown in FIGS. 1 and 2, among the plurality of weed pods 13 of the pre-cutting processing unit 10, some of the multiple weed pods 13, etc., which are located on the laterally outermost sides of the pre-cutting processing unit 10. By attaching the housing 18 to the lower part slightly behind the weeding implement 14 of the weed 13, the ground plane portion 18 a formed by the bottom surface of the housing 18 is used as the plurality of partial weeds 13. Is provided.

  As shown in FIG. 4, a balance mechanism 20 having a balance spring 21 is provided between the pre-processing unit frame 11 of the pre-cutting processing unit 10 and the front end of the body frame 3 of the self-propelled machine body.

  The balance mechanism 20 is provided on the rear side of the self-propelled machine body of the two balance springs 21 and the pre-processing unit frame 11 that are arranged side by side in the lateral direction of the self-propelled machine body at a position above the hydraulic cylinder 8. A spring contact portion 22 is provided.

  Each balance spring 21 is constituted by a coil spring. The abutting action surface 23 of the spring contact portion 22 moves while drawing an arc locus T about the vertical swing axis X of the pre-cutting processing unit 10 by the vertical swinging of the pre-cutting processing unit 10. As the pre-cutting processing unit 10 descends from the non-operating state, the spring contact portion 22 starts to contact the load receiving portion formed by the front end side holder 28 of each balance spring 21. Each of the balance springs 21 has a spring axis 21a of the balance spring 21 arranged along the tangent line L, and the base end side holder 25 of the spring holder 24 is fixed to the body frame 3. A spring telescopic guide 27 fixed to the spring receiving base 26 is supported via the spring holder 24 so as to be received and supported by the seat plate 26a of the base 26. Each balance spring 21 is covered with a flexible spring cover 30 so as to allow expansion and contraction of the balance spring 21.

  As shown in FIGS. 4, 5, and 6, the spring holder 24 includes the distal end side holder 28 in which a locking cylinder portion 28 a enters and is engaged with the distal end side of each balance spring 21, and the proximal end side of each balance spring 21. A locking cylinder portion entering one of the balance springs 21 of the proximal end side holder 25, the distal end side holder 28 and the proximal end side holder 25, which is engaged with and locked with a locking cylinder portion 25a which is also used for preventing spring buckling. The distal end side holder 28 and the proximal end side holder 25 are connected by tightening and connecting the locking cylinder portions 25a and 28a entering the other balance spring 21 and the balance springs 21 by the tightening force. The connecting rod 29 is compressed and deformed, and the two balance springs 21 are combined to give each balance spring 21 an initial compressive deformation. Held in the state to. The distal end side holder 28 of the spring holder 24 constitutes a load receiving portion that receives a load by the spring contact portion 22 of the pretreatment portion frame 11 of each balance spring 21. A pair of the spring telescopic guide rods 27 extending from the seat plate 26 a of the spring pedestal 26 pass through the proximal end side holder 25 and the distal end side holder 28, and from the distal end side holders 28 of the spring telescopic guide rods 27. By preventing the spring holder 24 from being removed by the retaining pin 27a attached to the projecting end, each balance spring 21 is supported by the spring pedestal 26 with initial compression deformation applied. ing.

  The spring contact portion 22 of the pretreatment unit frame 11 is configured by a self-propelled machine body-oriented round bar attached to the pretreatment unit frame 11 via an attachment member 31, and the pre-cutting processing unit 10 is in a descending work state. When the lowering operation is performed, the load acting on the load receiving portion (tip-side holder 28) of each balance spring 21 by the contact action surface 23 formed by the peripheral surface of the round bar, and the load determined by the weight of the pre-cutting processing unit 10 Thus, each balun spring 21 is pressed. The abutting action surface 23 of the spring abutting portion 22 is a circumferential surface of a self-propelled machine body-oriented round bar, so that a projecting circular arc is seen in the direction along the vertical swing axis X of the pre-cutting processing portion 10. The pre-cutting processing unit 10 is lowered while the spring contact unit 22 and the balance springs 21 are supported by the pre-processing unit frame 11 and the machine body frame 3 without any change in posture. Even if the connection position in the working state changes up and down and the relative posture changes between the spring abutting portion 22 and the balance spring 21, the load direction of the balance spring 21 is the spring axis 21a of the balance spring 21. Thus, the load of the pre-cutting processing unit 10 is applied to the balance spring 21 in a state that is in a direction along as much as possible. Thereby, even if the connection position in the lowering work state of the pre-cutting processing unit 10 is changed up and down, each balance spring 21 is smoothly expanded and contracted in a state without being twisted, and the lifting operation force is applied to the pre-cutting processing unit 10. Give.

When the pre-cutting processing unit 10 is operated to be lowered from the ascending non-working state to reach the highest connection height in the descending working state, the spring contact portion 22 of the pre-processing unit frame 11 is loaded with the load receiving portions (the tip side) of the balance springs 21. When it comes into contact with the spring holder 28) and the pre-cutting processing unit 10 is further lowered, the hydraulic cylinder 8 becomes the stroke end on the lowering side, and the pre-cutting processing unit 10 reaches the lowest connection position in the descending work state. Until it becomes, it is comprised so that the spring contact part 22 of the pre-processing part frame 11 may press each balance spring 21 with the load of the cutting pre-processing part 10, and may compress it. As a result, the balance mechanism 20 applies an ascending operation force to the pre-cutting processing unit 10 by the two balance springs 21 in a state where the pre-cutting processing unit 10 is operated in the descending work state. When the grounding flat surface portion 18a is grounded and receives a grounding reaction force from the ground, the pre-cutting processing unit 10 is raised by the grounding reaction force even if the grounding reaction force is light relative to the weight of the pre-cutting processing unit 10. Allowing to be manipulated.
Each balance spring 21 is assembled in such a state that it does not reach the elastic deformation limit even when the hydraulic cylinder 8 reaches the lower stroke limit, and can still be elastically deformed to the shortened side.

That is, this combine performs a harvesting operation based on the harvesting method shown in FIG.
That is, as shown in FIG. 3, the lift lever 36 linked to the electromagnetic operation portion of the control valve V of the hydraulic cylinder 8 via the control means 35 is switched to the lowered position, and the control valve V is switched to “down”. Then, the hydraulic cylinder 8 is operated to the lowered state, and the pre-cutting processing unit 10 is lowered by the hydraulic cylinder 8 from the raised non-working state. When the pre-cutting processing unit 10 is lowered to the highest position in the descending work state, the spring contact portion 22 of the pre-processing unit frame 11 comes into contact with the load receiving portion (tip end side holder 28) of each balance spring 21, and thereafter each balance The spring 21 becomes a lowering resistance, and the lowering speed of the pre-cutting processing unit 10 is lower than before. As a result, it is easily recognized that the pre-cutting processing unit 10 has entered the descending work state, and thereafter, the pre-cutting processing unit 10 is further lowered while taking care not to lower the pre-cutting processing 10 too much. The set connection height at a desired set cutting height, such as the standard connection height at which the pre-cutting processing unit 10 is further lowered and the tip side of the weed culm 13 is set to the set standard cutting height h (see FIG. 7). Then, the lift lever 36 is switched to the neutral position, the control valve V is switched to “neutral” to maintain the hydraulic cylinder 8 in the neutral state, and the hydraulic cylinder 8 serves as a lowering stopper for the pre-cutting processing unit 10. Harvesting is performed while the pre-cutting processing unit 10 is supported and supported by the set connection height that has risen from the ground to the set cutting height, and the planted cereal is cut at the set cutting height. If the self-propelled aircraft tilts forward or has a raised portion on the ground, the grounding reaction force from the ground received by the pre-cutting processing unit 10 by the ground plane 18a and the balance mechanism 20 2 The harvesting pretreatment unit 10 is lifted higher than the set connection height by the lifting operation force of the individual balance springs 21, and the harvesting tool 14 is harvested while preventing the weeding tool 14 and the like from being pushed into the ground or the raised portion.

  FIG. 7 shows the relationship between the lifting range A on the front side of the weed culm of the pre-cutting processing unit 10 to which the upper operating force is applied by the balance mechanism 20 and the horizontal plane B in a state where the self-propelled machine body is positioned on the horizontal plane. The raising / lowering range A is set so as to satisfy the relationship shown. That is, in a state where the center a of the lifting range A is positioned lower than the horizontal plane B, and the tip side of the weed ridge floats from the horizontal plane B to the set standard cutting height h and is in a horizontal posture. The tip of the weed ridge is set so as to be located at a position higher than the elevation range center a.

  That is, as shown in FIG. 14 (a), when the slope S is self-propelled from the ridge C and enters the field E, the pre-cutting processing unit 10 is set to the connection height in the forward-lowering posture, and the pre-cutting processing unit The center of gravity is lowered by the lowering of 10 and the traveling device 1 is moved to the slope S from the heel C, and the pre-cutting processing unit 10 comes into contact with the ground so that the occurrence of impact can be suppressed and the self-running movement is possible. It is. As shown in FIG. 14 (b), after entering the slope S in this way, when entering the field E from the slope S, the pre-cutting processing unit 10 is self-propelled due to the ground reaction force received by contacting the field scene. It rises with respect to the body and can enter the field E while avoiding the weeding tool 14 thrusting into the field scene.

  As shown in FIG. 5, a bolt hole 40 and a pin hole 41 are provided in the tip side holder 28 of the spring holder 24, and a spring pressure adjusting plate 42 can be attached to and detached from the surface side of the tip side holder 28. As shown in FIGS. 8 and 9, the spring pressure adjustment plate 42 includes a bolt hole 43 and a rotation stop pin 44, and the rotation stop pin 44 is engaged with the pin hole 41 of the distal end side holder 28, and the spring pressure adjustment plate 42. By attaching the connecting bolt 45 to the bolt holes 43 and 40 of the tip side holder 28, the tip side holder 28 is attached.

  That is, when the forced weeding device 46 is mounted on the front side of the raising device 16 of the pre-cutting processing unit 10 as shown in FIGS. 10 and 11, the weight of the pre-cutting processing unit 10 is due to the weight of the forced weeding device 46. Increase. Thereby, when the forced weeding device 46 is attached, the spring pressure adjusting plate 42 is attached to the tip side holder 28 of the spring holder 24. Then, for example, when the pre-cutting processing unit 10 reaches the connection height of the set standard cutting height h, when the connection height of the setting standard cutting height h is obtained without the forced weeding device 46. In comparison, the amount of deformation by which each balance spring 21 is elastically deformed by the load of the pre-cutting processing unit 10 increases, and a large ascending operation force is applied to the pre-cutting processing unit 10 by each balance spring 21, so that the pre-cutting processing is performed. Regardless of the weight increase, the part 10 is slightly raised by the ground reaction force.

  As shown in FIG. 15, when the pre-cutting processing unit 10 is too heavy and the balance mechanism 20 cannot be adjusted to a state where an appropriate lifting operation force can be exerted even when the spring pressure adjusting plate 42 is attached as shown in FIG. Further, the spring pressure may be adjusted by providing the balance spring 21 with an auxiliary balance spring 21 a concentrically arranged with each balance spring 21.

  As shown in FIGS. 12 and 13, a lowering detection switch 51 is supported by a support member 50 fixed to the body frame 3. This lowering detection switch 51 is a round bar in which the operating arm 51a of the lowering detection switch 51 constitutes the spring contact portion 22 of the preprocessing unit frame 11 when the pre-cutting processing unit 10 is lowered to the lowering work state. A detection state is obtained when the material is pressed and turned on. The lowering detection switch 51 in the detection state outputs a signal for operating the cutting clutch 52 to the engaged state to the control means 35, so that the cutting clutch 52 is switched to the engaged state and the pre-cutting processing unit 10 is operated. Drive (see FIG. 3).

[Another Example]
The hydraulic cylinder 8 that moves up and down the cutting pretreatment unit 10 as in the above embodiment is used as a lowering stopper, and the cutting pretreatment unit is received and supported in a floating state at a set cutting height, and is supported for hanging. The object of the present invention can be achieved even if the stopper and the hanging tool are employed. Therefore, these hydraulic cylinders 8, stoppers, suspenders, etc. are collectively referred to as descending stopper means 8.

8 Lowering stopper 10 Cutting pretreatment part 18a Grounding plane part 21 Balance spring

Claims (5)

It is a harvesting method by a combine in which a cutting pretreatment unit is connected to a front part of a self-propelled aircraft so as to be movable up and down,
Lowering stopper means for supporting the pre-cutting processing unit at a connection height that has floated to a set cutting height from the ground, allowing the pre-cutting processing unit to rise from the connection height by a ground reaction force from the ground. A harvesting method using a combine that travels while harvesting while in effect.   Lowering stopper means for supporting the cutting pretreatment unit connected to the front part of the self-propelled machine body so as to be raised and lowered from the ground at a connection height that has risen to the cutting height, and the cutting pretreatment unit is grounding reaction force from the ground The combine is constructed and equipped to allow it to rise from the connection height.   3. The hydraulic cylinder according to claim 2, wherein the lowering stopper means is a hydraulic cylinder that raises the pre-cutting processing unit when hydraulic oil is supplied and lowers the pre-cutting processing unit when hydraulic oil is discharged. Combine.   The combine according to claim 2 or 3, wherein the pre-cutting processing unit is provided with a ground plane portion that contacts the ground and receives a ground reaction force.   The combine according to any one of claims 2 to 4, wherein a balance spring is provided for applying a rising operation force to the pre-cutting processing unit at the connection height of the set cutting height.

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