JP2008022771A - Combine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combine performing a reaping work by a reaping part following the ground surface to prevent the thrust of the reaping part into the ground and a reaping work to prevent the generation of remained crop of lodged culm. <P>SOLUTION: A reaping part is swingably and liftably connected to the front part of a self-propelled machine body. The reaping part has a ground contact part. The combine is provided with a balance-supporting means 20 acting on the reaping part. The balance-supporting means 20 is switchable between an action state supporting the reaping part to decrease the ground contact pressure of the reaping part and a released state free from the supporting action on the reaping part of the state in contact with the ground at the ground contact part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a combine in which a cutting part is connected to a front part of a self-propelled machine body so as to be swingable up and down.

Conventionally, this type of combine has been disclosed in Patent Document 1.
The thing shown by patent document 1 is provided with the grounding hook provided in the weeding hook of the cutting part. An arm member that swings up and down together with the cutting frame of the cutting unit with respect to the frame of the self-propelled machine body, and a balance spring interposed between the arm member and the frame of the self-propelled machine body are provided. The balance spring elastically supports the mowing part via the spring receiver when the mowing part is located in a range below the set level in the lifting range with respect to the self-propelled aircraft, and the mowing part rises in response to the undulation of the ground Decrease the ground pressure of the cutting part so that it is easy to do. That is, the cutting unit can be made to follow the ground in a state where it is easy to avoid the cutting unit from being pushed into the ground.

JP 2004-267123 A

According to the combine adopting the above-described technique, when the planted cereals are prone to fall down, uncutting is likely to occur.
That is, when the cutting part is supported by the balance spring as the balance support means, the cutting part rises in response to a change in the ground reaction force at the grounding part. Thereby, when a cutting part raises with respect to a self-propelled body, an excessive raise by the inertia of a cutting part tends to occur. Then, when the planted culm is lying low on the ground, the reaping action and the mowing action of the reaping part are less likely to reach the lodging cereal because of the excessive rise of the reaping part.

  An object of the present invention is to provide a combine that can perform a grounding follow-up operation in a state in which it is difficult to push the cutting part into the ground, and can prevent uncut cereals from falling over.

The first aspect of the present invention is the combine in which the cutting part is connected to the front part of the self-propelled aircraft so as to be swingable up and down.
A grounding part is provided in the cutting part, and can be switched between an action state in which the cutting part is supported so as to reduce the ground pressure of the cutting part and a release state in which the support action for the cutting part in the grounded state by the grounding part is released. A proper balance support means is provided.

  According to the configuration of the first aspect of the present invention, when the balance support means is switched to the operating state, the balance support means supports the cutting part, and the ground pressure of the cutting part decreases due to the action of the balance support means. Then, the cutting part can be grounded and tracked in a state where the cutting part rises in response to a change in the ground reaction force at the grounding part. When the balance support means is switched to the release state, the balance support means does not support the cutting part even if the cutting part is grounded by the grounding part. Then, the cutting part enters a grounding state where the cutting part slightly enters the ground or a grounding state that does not easily rise due to bouncing or the like, and the raising or cutting action of the cutting part easily reaches the fallen cereal.

  This makes it possible to effectively prevent the cutting part from being pushed into the ground by rising in response to changes in the ground reaction force of the cutting part. Therefore, it is possible to perform a cutting operation that is easy to cut and that does not easily generate uncut residue.

  According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the balance support means includes a contacted portion and a balance spring portion that are divided and provided on one and the other of the cutting portion and the self-propelled aircraft body, and A state where the balance spring portion is held in contact with the abutted portion so as to support the mowing portion, and a state where the balance spring portion is held apart from the abutted portion so as to release the supporting action for the mowing portion. And a switchable holding part.

  According to the configuration of the second aspect of the invention, the balance support means can be supported and acted on the cutting part by simply switching the holding state of the balance spring part by the holding part, or the support of the cutting part by the balance support means can be released. Therefore, it is possible to easily and quickly switch between an operation mode for preventing the cutting portion from being pushed into the ground and an operation mode for preventing uncut cereals from being fallen.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view of a combine according to an embodiment of the present invention. FIG. 2 is a plan view of the combine according to the embodiment of the present invention. As shown in these drawings, a combine according to an embodiment of the present invention is a self-propelled aircraft that has a driving unit that is self-propelled by a crawler-type traveling device 1 and that is equipped with a driver seat 2. A cutting unit 10 connected to the front part of the machine frame 3 of the running machine, and a threshing device 5 and a grain tank 6 provided on the rear side of the machine frame 3 of the self-running machine are provided.

  This combine harvests rice and wheat. That is, the cutting unit 10 is configured so that the base 11b of the preprocessing unit frame 11 is located at the front of the body frame 3 by the lifting operation mechanism 50 provided across the preprocessing unit frame 11 and the body frame 3 of the cutting unit 10. The grounding portion 18 is swing-operated with respect to the self-propelled machine body about the lateral axis X of the self-propelled machine body that is connected to the support body 4 positioned in a relatively rotatable manner, and is provided at the front portion of the cutting unit 10. Is grounded, and the lifting device 12 is moved up and down into a lowered working state in which the mowing device 12 located on the rear side of the grounding portion 18 is located near the ground, and an ascending non-working state in which the grounding portion 18 is elevated from the ground. The When the cutting unit 10 is in the descending work state and the self-propelled machine body is caused to travel, the cutting unit 10 is planted cereal by the plurality of weeding tools 14 that are positioned in the lateral direction of the self-propelling machine body at the front part of the cutting unit 10. The culm is divided into a reaping target and a non-reaping target, and the cultivated cereal culm to be reaped is guided to the trigger path 15 located behind each of the weeding tools 14, and the cultivated cereal guided to each of the trigger paths 15. The husk is caused and processed by the device 16 and is also cut by the clipper-shaped reaping device 12, and the chopped cereal from the reaping device 12 is conveyed backward by the feeding device 17 to the threshing feed chain 5 a of the threshing device 5. To the beginning of The threshing device 5 feeds the tip side to a handling room (not shown) while holding the stock side of the harvested cereal by the threshing feed chain 5a and transporting it toward the rear of the machine, and rotates the tip side. Threshing is performed by a trunk (not shown). The grain tank 6 collects and stores the threshed grains conveyed from the threshing device 5.

  As shown in FIGS. 1 and 2, the pre-processing unit frame 11 includes a main frame 11 a including a transmission case in which a base 11 b is rotatably supported around the axis X on the support 4, and the main frame 11 a. 11a, and a branch weed 13 extending forward from the plurality of locations in the lateral direction of the self-propelled aircraft. Each of the weeding implements 14 is provided at the extending end of the weeding basket 13.

  As shown in FIG. 1, the grounding portion 18 is disposed over a lower portion of a connecting rod 19 that connects a support bracket 14 a of the weeding tool 14 to the weeding rod 13 and a lower portion of the weeding rod 13. It is composed of a single enclosure.

  FIG. 3 shows the structure of the elevating operation mechanism 50 in a front view of the self-propelled machine body. FIG. 4 shows the structure of the elevating operation mechanism 50 in a side view of the self-propelled aircraft. As shown in these drawings, the elevating operation mechanism 50 is connected to a pair of left and right brackets 52, 52 fixed to the support body 4 so that a connecting shaft portion 53b is rotatable around an axis 53a that faces the self-propelled machine body. And a hydraulic single-acting cylinder connected over a bracket 58 fixed to the free end side shaft portion 53d of the swing operation body 53 and a bracket 54 fixed to the body frame 3. An elevating cylinder 51 is provided. The free end side shaft portion 53d of the swing operation body 53 and a locking rod 55 supported by a pair of left and right brackets 56, 56 fixed to the swing operation body 53 sandwich the main frame 11a. Thus, the swing operation body 53 is locked to the main frame 11a so as to be swingable integrally. The free end side shaft portion 53d of the swing operation body 53 abuts on a protection plate 11c provided on the main frame 11a and pushes up the main frame 11a. The locking rod 55 is locked to the main frame 11 a via the mediating member 57. As shown in FIGS. 3 and 4, the spiral shaft 60 rotatably supported by the pair of left and right brackets 56, 56 is rotated in the forward rotation direction and the reverse rotation direction by the electric motor 61, via the lateral feed member 62. The main frame 11a is moved and operated along an input shaft 63 that is also used as a connecting shaft between the main frame 11a and the support 4. That is, the helical shaft 60 changes the position of the cutting unit 10 to the connection position for the mid-split operation and the connection position for the swivel operation with respect to the self-propelled machine body.

  That is, when hydraulic pressure is supplied to the lifting cylinder 51, the lifting operation mechanism 50 is operated by extending and lowering the main frame 11 a via the swing operation body 53 by the lifting cylinder 51 being extended by the hydraulic pressure, thereby cutting. When the hydraulic pressure is discharged from the lifting / lowering cylinder 51 by operating the lifting / lowering part 10, the lifting / lowering cylinder 51 is shortened by the weight of the cutting part 10, and the main frame 11 a is moved downward and swinging to lower the cutting part 10. To do.

  As shown in FIGS. 3, 5, 6, 7, and 8, balance support means 20 is provided across the front part of the body frame 3 and the main frame 11 a of the cutting part 10. 3 and 7 show the structure of the balance support means 20 in a front view of the self-propelled machine body. FIG. 5 shows the structure of the balance support means 20 in a side view of the self-propelled aircraft. FIG. 6 is a longitudinal side view of the balance support means 20. FIG. 8 is a longitudinal plan view of the balance support means 20. As shown in these drawings, the balance support means 20 includes a holding portion 31 provided on the body frame 3, a balance spring portion 21 held on the holding portion 31, and a contacted portion 20a provided on the main frame 11a. And.

  The contacted portion 20 a is configured by a free end side shaft portion 53 d of the swing operation body 53.

  The balance spring portion 21 includes a spring receiving base 26, a base end side spring holder 25 and a front end side spring holder 28 supported by a pair of support shafts 27, 27 fixed to the spring receiving base 26, and the base end side spring holder. 25, a balance spring 22 formed of a coil spring provided inside the distal end side spring holder 28 and the spring cover 30, and a connecting rod 29 attached over the proximal end side spring holder 25 and the distal end side spring holder 28. The connecting rod 29 connects the proximal end side spring holder 25 and the distal end side spring holder 28 so as not to be separated from each other by a set interval or more, thereby providing the balance spring 22 with an initial elastic deformation. The pair of support shafts 27, 27 slidably supports the tip side spring holder 28. The connecting rod 29 connects the proximal end side spring holder 25 and the distal end side spring holder 28 so as to be freely accessible. The spring cover 30 is telescopic.

The holding portion 31 is constituted by a sheet metal member fixed to the body frame 3, and includes holding grooves 32, 33, 34 provided side by side in the front-rear direction of the self-propelled body on both sides of the sheet metal member. 5, 6 and 8 show a state in which the holding portion 31 holds the balance spring portion 21 in a use state. As shown in these drawings, among the left and right holding grooves 32, 33, and 34, the first holding groove 32 positioned at the foremost side, or the second holding groove 33 adjacent to the first holding groove 32. When the mounting plate portion 26a of the spring cradle 26 is engaged, the holding portion 31 switches to a state where the balun spring portion 21 is held in use. When the holding part 31 holds the balance spring part 21 in use in this way, the balance spring part 21 causes the reaping part 10 to move to the upper non-working part B (see FIG. 12) in the lifting range A with respect to the self-propelled machine body. When positioned, the contacted portion 20a is disposed so as to be separated upward from the distal end side spring holder 28, and the cutting portion 10 is positioned at the lower working portion C (see FIG. 12) of the lifting range A. For example, the contacted portion 20a and the tip-side spring holder 28 are in contact with each other, and the balance spring 22 is arranged and held so as to be more elastically deformed than the initial elastic deformation state by the weight of the cutting portion 10. When the holding portion 31 is compared with the case where the balance spring portion 21 is held by the first holding groove 32 and the case where the holding portion 31 is held by the second holding groove 33, the holding portion 31 is the second holding groove when held by the first holding groove 32. Compared to the case where the mowing part 10 is lowered from the ascending stroke end, the connection height of the mowing part 10 to the self-propelled machine body when the abutted part 20a and the tip side spring holder 28 start to come into contact with each other as compared with the case where the mowing part 10 is lowered from the ascending stroke end. The balance spring portion 21 is held in a raised state. When the holding unit 31 is switched to the state in which the balance spring unit 21 is held in use, the holding unit 31 holds the balance spring unit 21 in the state illustrated in FIG. 6. That is, when the cutting part 10 is positioned at the connection height h (see FIG. 12) in the working part C in the horizontal posture in the longitudinal direction of the machine body, the contacted part 20a is positioned on the shaft core 22a of the balance spring 22. The balance spring portion 21 is held in a state where the contacted portion 20a and the balance spring portion 21 are in contact with each other.
9 and 10 show a state where the holding portion 31 holds the balance spring portion 21 in the retracted state. As shown in these drawings, the mounting plate portion 26a of the spring pedestal 26 is located in the storage holding groove 34 located behind the second holding groove 33 among the left and right holding grooves 32, 33, 34. When engaged, the holding portion 31 switches to a state where the balance spring portion 21 is held in the retracted state. When the holding portion 31 holds the balance spring portion 21 in the retracted state in this way, the balance spring portion 21 does not move even when the reaping portion 10 is positioned at the lower work site C in the lifting range A. The contact portion 20a and the tip side spring holder 28 are arranged and held so as to be separated from each other.

  As a result, when the holding unit 31 is switched to a state in which the balance spring unit 21 is held in use, the balance support means 20 moves the swinging operation body to the cutting unit 10 located at the work site C in the lifting range A. The operating state supported by the balance spring portion 21 is switched via 53, and the ground contact pressure at the ground contact portion 18 of the reaping portion 10 is reduced by the amount by which the lifting operation force is applied by the balance spring portion 21. On the other hand, when the holding portion 31 is switched to the state in which the balance spring portion 21 is held in the retracted state, the balance support means 20 is switched to a release state in which the support action for the cutting portion 10 by the balance spring portion 21 is released. Release 10 ground pressure reduction.

  FIG. 11 shows a hydraulic circuit of the lifting operation mechanism 50. As shown in this figure, the control valve V of the elevating cylinder 51 is linked to the elevating lever 70 via the control means 70a. The elevating lever 70 is used to make the position "neutral", "up" and "down". Switching operation is performed. The control valve V that has been switched to “neutral” stops the supply and discharge of hydraulic pressure to the lifting cylinder 51. Even in a state in which the control valve V is operated to be “neutral”, the elevating cylinder 51 has a difference between the ground reaction force and the lifting operation force by the balance spring 22 depending on the magnitude of the ground reaction force acting on the ground contact portion 18. It is slightly extended for the resultant force and for the inclusion of bubbles in the pressure oil, etc., and allows the cutting unit 10 to move up and down with respect to the self-propelled aircraft. In a state where the control valve V is operated to be “neutral”, the elevating cylinder 51 does not operate to be shortened even when an external force for shortening operation is applied, and serves as a stopper for the mowing unit 10 and the mowing unit 10 descends with respect to the self-propelled machine body. Set limits.

  That is, in performing the work, the control valve V is switched to “down” by the elevating lever 70. Then, the elevating cylinder 51 is drained by the control valve V and shortened, and the mowing unit 10 is lowered. When the grounding part 18 comes into contact with the lowering of the cutting part 10, the control valve V is switched to "neutral".

  At this time, if the balance spring portion 21 is held by the holding portion 31 in the used state, the balance support means 20 is in the operating state. And if the cutting part 10 will be in a grounding state, the to-be-contacted part 20a and the front end side spring holder 28 will contact | abut, and the balance support means 20 will reduce the grounding pressure in the grounding part 18 of the cutting part 10 by the balance spring part 21. Let And the raising / lowering cylinder 51 exists in a stop state, and it acts on the cutting part 10 so that the fall limit with respect to the self-propelled machine body of the cutting part 10 may be set. Thereby, the cutting part 10 is in a state where it rises with respect to the self-propelled machine body in response to a change in the ground reaction force of the grounding part 18, and the lowering limit of the cutting part 10 with respect to the self-propelled machine body is the lifting cylinder 51. In this state, the lowering work state follows the grounding contact by the grounding unit 18. For this reason, the cutting unit 10 performs the cutting operation while making it difficult for the weeding tool 14 to be pushed into the soil and making the cutting height of the cutting device 12 constant or substantially constant.

  On the other hand, if the balance spring portion 21 is held in the holding portion 31 in the retracted state, the balance support means 20 is in the released state. Even when the reaping portion 10 is in the grounding state, the abutted portion 20a and the tip-side spring holder 28 remain separated, and the grounding pressure of the reaping portion 10 is reduced by the balance spring portion 21 of the balance support means 20. I will not. And the raising / lowering cylinder 51 exists in a stop state, and it acts on the cutting part 10 so that the fall limit with respect to the self-propelled machine body of the cutting part 10 may be set. As a result, the cutting unit 10 is in the lowered work state supported by the lifting cylinder 51 at a connection height where the weeding tool 14 has slightly entered the ground and in a state where it does not easily rise with respect to the self-propelled machine body. . For this reason, the reaping unit 10 performs the reaping work while making it difficult for the weeding tool 14 and the raising device 16 to cause a mistake, and the reaping device 12 to make a mistake even if the planted cereals are significantly fallen.

  When the mowing unit 10 is raised, the control valve V is switched to “rise” by the lift lever 70. Then, the lift cylinder 51 is supplied with hydraulic pressure from the control valve V and is extended, and the mowing unit 10 is lifted. When the mowing unit 10 rises to a desired connection height such as a stroke end, the control valve V is switched to “neutral”. Then, the raising / lowering cylinder 51 stops and the cutting part 10 becomes desired connection height.

  13, 14 and 15 show the balance support means 20 having the second embodiment structure. As shown in these drawings, the balance support means 20 includes a balance spring portion 21 having a balance spring 22 formed of a coil spring, and a holding portion 31 having an adjustment screw shaft 37.

  The balance spring portion 21 includes the balance spring 22, a distal end side spring holder 28 attached to the front end side of the balance spring 22, a proximal end side spring holder 25 attached to the proximal end side of the balance spring 22, A connecting rod 29 that connects the spring holders 28 and 25, a support shaft 27 that slidably supports the spring holders 28 and 25, and a bellows type spring cover 30 that covers the balance spring 22.

  In addition to the adjustment screw shaft 37, the holding portion 31 includes a spring receiving base 26 connected to the base end side spring holder 25, and a base base 36 that holds the adjustment screw shaft 37 in a freely screwable manner. . The base stand 36 is fixed to a body frame (not shown) of the self-propelled body. The distal end side of the adjustment screw shaft 37 is engaged with the spring cradle 26 so as to be relatively rotatable and integrally movable.

  FIG. 13 shows a state in which the holding portion 31 holds the balance spring portion 21 in a use state. FIG. 15 shows a state where the holding part 31 holds the balance spring part 21 in the retracted state. As shown in these drawings, in the holding portion 31, the adjusting screw shaft 37 is rotated, and the spring receiving base 26 is moved between the distal ends of the pair of guide wall portions 36 a and 36 a of the base base 36 by the adjusting screw shaft 37. The balance spring portion 21 is switched to the use state and is held by moving the spring holder 26 between the base end sides of the pair of guide walls 36a, 36a by the adjusting screw shaft 37. Thus, the balance spring portion 21 is switched to the stored state and held.

When the balance spring portion 21 is held in use, the abutted portion 20a and the tip-side spring holder 28 are provided when the cutting portion 10 is positioned in the lower working portion C in the lifting range A with respect to the self-propelled machine body. Are held in contact with each other. As a result, the balance support means 20 switches to an action state in which the reaping portion 10 supported by the grounding portion 18 is grounded and supported by the balance spring 22. That is, the balance support means 20 reduces the ground pressure at the grounding portion 18 of the reaping portion 10 so that the rising of the reaping portion 10 with respect to the self-propelled aircraft in response to the change in the grounding reaction force of the grounding portion 18 becomes sensitive.
On the other hand, when the balance spring portion 21 is held in the retracted state, the abutted portion 20a and the distal end side even if the cutting portion 10 is located at the lower work site C in the lifting range A with respect to the self-propelled machine body. This means that the spring holder 28 is held apart. As a result, the balance support means 20 is switched to the release state so as to release the support action of the cutting unit 10 by the balance spring 22 even when the cutting unit 10 is grounded by the grounding unit 18. Cancel the decrease.

  16, 17, and 18 show the balance support means 20 having the third embodiment structure. As shown in these drawings, the balance support means 20 includes a balance spring portion 21 having a balance spring 22 formed of a coil spring and a holding portion 31 having a holding body 35.

  The balance spring portion 21 includes the balance spring 22, a distal end side spring holder 28 attached to the front end side of the balance spring 22, a proximal end side spring holder 25 attached to the proximal end side of the balance spring 22, A connecting rod 29 for connecting the spring holders 28, 25, a bellows type spring cover 30 for covering the balance spring 22, and a spring pedestal 26 connected to the proximal end side spring holder 25 are provided. The spring cradle 26 includes a mounting plate portion 26 a fixed on the rear surface side of the spring cradle 26.

  In addition to the holding body 35, the holding portion 31 includes a spring receiving guide 36 that extends from the lower portion of the holding body 35 toward the front of the machine body.

  The holding body 35 is fixed to the body frame 3. The holding body 35 includes a pair of left and right holding plates 35a and 35a. Each holding plate 35 a includes holding grooves 32, 33, and 34 arranged in the longitudinal direction of the machine body. The spring receiving guide 36 includes a spring receiving surface 36 a on which the spring holders 28 and 25 are placed and which supports the balance spring portion 21.

  FIG. 16 shows a state in which the holding portion 31 holds the balance spring portion 21 in a use state. FIG. 18 shows a state where the holding part 31 holds the balance spring part 21 in the retracted state. As shown in these drawings, the holding portion 31 is spring-received by a first holding groove 32 located on the most front side of the body of the pair of left and right holding plates 35a or a second holding groove 33 adjacent to the first holding groove 32. By mounting the mounting plate portion 26a of the base 26, the balance spring portion 31 is switched to the use state and held, and the spring support 26 is inserted into the third holding groove 34 on the most rear side of the pair of left and right holding plates 35a. When the mounting plate portion 26a is attached, the balance spring portion 31 is switched to the stored state and held.

When the balance spring portion 21 is held in use, the abutted portion 20a and the tip-side spring holder 28 are provided when the cutting portion 10 is positioned in the lower working portion C in the lifting range A with respect to the self-propelled machine body. Are held in contact with each other. As a result, the balance support means 20 switches to an action state in which the reaping portion 10 supported by the grounding portion 18 is grounded and supported by the balance spring 22. That is, the balance support means 20 reduces the ground pressure at the grounding portion 18 of the reaping portion 10 so that the rising of the reaping portion 10 with respect to the self-propelled aircraft in response to the change in the grounding reaction force of the grounding portion 18 becomes sensitive. In the use state in which the balance spring portion 21 is held by the first holding groove 32 and the use state in which the balance spring portion 21 is held by the second holding groove 33, when the cutting unit 10 is lowered from the ascending stroke end, the contacted portion The mounting height of the cutting unit 10 with respect to the self-propelled machine body when 53d abuts against the tip side spring holder 28 is different. That is, when the balance spring portion 21 is held in use by the first holding groove 32, the height of attachment of the reaping portion 10 to the self-propelled machine body when the abutted portion 53 d abuts against the distal end side spring holder 28. Becomes higher.
On the other hand, when the balance spring portion 21 is held in the retracted state, the abutted portion 20a and the distal end side even if the cutting portion 10 is located at the lower work site C in the lifting range A with respect to the self-propelled machine body. This means that the spring holder 28 is held apart. As a result, the balance support means 20 is switched to the release state so as to release the support action of the cutting unit 10 by the balance spring 22 even when the cutting unit 10 is grounded by the grounding unit 18. Cancel the decrease.

  19, 20, and 21 show the balance support means 20 having the fourth embodiment structure. As shown in these drawings, the balance support means 20 includes a balance spring portion 21 having a balance spring 22 formed of a coil spring, and a holding portion 31 having an adjustment screw shaft 37.

  In addition to the balance spring 22, the balance spring portion 21 includes a front end side spring holder 28 attached to the front end side of the balance spring 22, a contact end side spring holder 25 attached to the base end side of the balance spring 22, A connecting rod 29 that connects the spring holders 28 and 25 and a bellows type spring cover 30 that covers the balance spring 22 are provided.

  The holding portion 31 includes the adjustment screw shaft 37, a spring receiving base 26 connected to the base end side spring holder 25, a base stand 36 that holds the adjustment screw shaft 37 in a freely screwable manner, and the base stand 36 is provided with a guide shaft 39 whose proximal end side is fixed. The base stand 36 is fixed to a body frame (not shown) of the self-propelled body. The distal end side of the adjustment screw shaft 37 is engaged with the spring cradle 26 so as to be relatively rotatable and integrally movable. The guide shaft 39 slidably supports the front end side spring holder 28 and the rear end side spring holder 25.

  FIG. 19 shows a state in which the holding portion 31 holds the balance spring portion 21 in a use state. FIG. 21 shows a state where the holding portion 31 holds the balance spring portion 21 in the retracted state. As shown in these drawings, the holding spring 31 is operated by rotating the adjustment screw shaft 37, and the balance spring portion 21 is moved by the adjustment screw shaft 37 toward the distal end side of the guide shaft 39. Is switched to the use state, and the balance spring portion 21 is moved to the proximal end side of the guide shaft 39 by the adjustment screw shaft 37 to switch the balance spring portion 21 to the retracted state and hold it.

When the balance spring portion 21 is held in use, the abutted portion 20a and the tip-side spring holder 28 are provided when the cutting portion 10 is positioned in the lower working portion C in the lifting range A with respect to the self-propelled machine body. Are held in contact with each other. As a result, the balance support means 20 switches to an action state in which the reaping portion 10 supported by the grounding portion 18 is grounded and supported by the balance spring 22. That is, the balance support means 20 reduces the ground pressure at the grounding portion 18 of the reaping portion 10 so that the rising of the reaping portion 10 with respect to the self-propelled aircraft in response to the change in the grounding reaction force of the grounding portion 18 becomes sensitive.
On the other hand, when the balance spring portion 21 is held in the retracted state, the abutted portion 20a and the distal end side even if the cutting portion 10 is located at the lower work site C in the lifting range A with respect to the self-propelled machine body. This means that the spring holder 28 is held apart. As a result, the balance support means 20 is switched to the release state so as to release the support action of the cutting unit 10 by the balance spring 22 even when the cutting unit 10 is grounded by the grounding unit 18. Cancel the decrease.

  FIG. 22 shows the balance support means 20 having the fifth embodiment structure. The balance support means 20 includes a pair of balance springs 22 and 22 arranged in the lateral direction of the self-propelled machine body. The pair of balance springs 22 and 22 are separately located on both lateral sides of the main frame 11a in the front-rear direction of the self-propelled machine body, and the free end side shaft portion 53d of the swing operation body 53 is placed on the contacted portion 20a. And supports the main frame 11a through the contacted portion 20a.

  FIG. 23 shows the balance support means 20 provided with the sixth embodiment structure. The balance support means 20 includes balance springs 22 and 22 formed of a pair of coil springs arranged concentrically. The pair of balance springs 22 and 22 are provided with a wire winding direction in which the winding directions are opposite to each other so as not to cause a situation where the wire rods mesh with each other during expansion and contraction.

  FIG. 24 shows the grounding part 18 provided with the second embodiment structure. As shown in this figure, the grounding portion 18 having the second embodiment structure includes a front rod 18a disposed below a connecting rod 19 that connects the support bracket 14a of the weeding tool 14 to the weed rod 13. , And a rear casing 18b disposed below the weed ridge 13.

  FIG. 25 shows the grounding portion 18 having the third embodiment structure. As shown in this figure, the grounding portion 18 having the third embodiment structure connects the front rod 18a disposed below the support bracket 14a of the weeding tool 14 and the support bracket 14a to the weeding rod 13. The rear casing 18b is arranged below the connecting rod 19 and the lower portion of the weed rod 13.

  FIG. 26 shows the grounding portion 18 having the fourth embodiment structure. As shown in this figure, the grounding portion 18 having the fourth embodiment structure is constituted by a casing disposed below a connecting rod 19 that connects the support bracket 14a of the weeding tool 14 to the weeding rod 13. It is.

  The grounding part 18 shown in FIG. 27 shows the grounding part 18 provided with the fifth embodiment structure. As shown in this figure, the grounding portion 18 provided with the fifth embodiment structure is constituted by a casing disposed below the weed ridge 13.

  The grounding part 18 shown in FIG. 28 shows the grounding part 18 provided with the sixth embodiment structure. As shown in this figure, the grounding portion 18 provided with the sixth embodiment structure is constituted by a casing disposed below the support bracket 14a of the weeding tool 14.

  The grounding part 18 shown in FIG. 29 shows the grounding part 18 provided with the seventh embodiment structure. As shown in this figure, the grounding portion 18 having the seventh embodiment structure is connected to the front rod body 18a disposed below the support bracket 14a of the weed cutting tool 14 and the support bracket 14a to the weed grass rod 13. The rear housing 18b is arranged below the connecting rod 19 that is connected.

  The grounding part 18 shown in FIG. 30 shows the grounding part 18 provided with the eighth embodiment structure. As shown in this figure, the grounding portion 18 having the eighth embodiment structure includes a lower portion of the support bracket 14a of the weeding tool 14 and a connecting rod 19 that connects the support bracket 14a to the weeding rod 13. It is comprised by the one housing | casing arrange | positioned over the downward direction.

  The grounding part 18 shown in FIG. 31 shows the grounding part 18 provided with the ninth embodiment structure. As shown in this figure, the grounding portion 18 having the ninth embodiment structure includes a lower part of the support bracket 14a of the weeding tool 14 and a connecting rod 19 that connects the support bracket 14a to the weeding rod 13. It is comprised by the one housing | casing arrange | positioned over the downward direction and the downward direction of the weed ridge 13.

  The grounding part 18 shown in FIG. 32 shows the grounding part 18 provided with the tenth embodiment structure. As shown in this figure, the grounding portion 18 having the tenth embodiment structure includes a front rod body 18 a disposed below the support bracket 14 a of the weeding tool 14 and a rear rod disposed below the weeding rod 13. It is comprised with the body 18b.

[Another Example]
Instead of the balance support means 20 in each of the above embodiments, the configuration in which the abutted portion 20a is provided in the self-propelled machine body and the balance spring portion 21 and the holding portion 31 are provided in the cutting portion 10 may be adopted. Can be achieved.

Side view of the entire combine Top view of the entire combine Front view of lifting operation mechanism and balance support means Side view of the lifting mechanism Side view of balance support means Side view with balance spring part of balance support means in use Front view of balance spring Longitudinal plan view with balance spring part of balance support means in use Side view with balance spring portion of balance support means in retracted state Longitudinal plan view with balance spring part of balance support means in retracted state Hydraulic circuit diagram of lifting operation Side view showing lifting range of mowing part The side view in the state in which the balance spring part of the balance support means provided with the second embodiment structure is in use. Front view of the balance spring portion of the balance support means having the second embodiment structure The side view in the state in which the balance spring part of the balance support means provided with 2nd implementation structure exists in a retracted state The side view in the state in which the balance spring part of the balance support means provided with the third embodiment structure is in use. Front view of balance support means having the third embodiment structure The side view in the state in which the balance spring part of the balance support means provided with the third embodiment structure is in a retracted state The side view in the state in which the balance spring part of the balance support means provided with the fourth embodiment structure is in use. Front view of balance support means having the fourth embodiment structure The side view in the state in which the balance spring part of the balance support means provided with the fourth embodiment structure is in a retracted state Front view of balance support means provided with fifth embodiment structure Side view of balance support means having sixth embodiment structure Side view of the grounding part with the second embodiment structure Side view of grounding part with third embodiment structure Side view of the grounding part with the fourth embodiment structure Side view of grounding part with fifth working structure Side view of the grounding part with the sixth implementation structure Side view of the grounding part with the seventh implementation structure Side view of the grounding part with the eighth structure Side view of the grounding part with the ninth implementation structure Side view of the grounding part with the tenth embodiment structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cutting part 18 Grounding part 20 Balance support means 20a Contacted part 21 Balance spring part 31 Holding part

Claims (2)

A combine in which a cutting part is connected to a front part of a self-propelled machine body so as to be swingable up and down,
A grounding part is provided in the cutting part,
A balance support means capable of switching between an action state in which the cutting part is supported so as to reduce the ground pressure of the cutting part and a release state in which the support action for the cutting part in the ground state by the grounding part is released is provided. .   The balance support means includes a contacted portion and a balance spring portion that are provided separately on one and the other of the mowing portion and the self-propelled aircraft, and the balance spring portion supports the mowing portion so as to support the balance spring portion. 2. A holding portion that is switchable between a state of being held in an arrangement in contact with the contact portion and a state of being held in an arrangement spaced from the abutted portion so as to release the support action for the cutting portion. Combine as described.

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