JP2012060971A - Combine harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combine harvester enabling a raking part to be easily made to ascend or descend, with a low-cost construction.SOLUTION: The combine harvester comprises: an ascendingly and descendingly operative part 30 installed at a steering section 8 and capable of winding a wire 20 connected to a support part 12 and capable of ascendingly operating a raking part 3; an impelling mechanism 13 imparting the support part 12 with ascendingly impelling force in the direction of making the raking part 3 ascend; and a height-adjusting mechanism 36 impelled so as to be fastened on the ascendingly and descendingly operative part 30, fastenable on the ascendingly and descendingly operative part 30 at a plurality of points along the rotating direction and also capable of making an unfastening operation, and when fastened on the ascendingly and descendingly operative part 30, permitting the rotation of the ascendingly and descendingly operative part 30 in the direction of the raking part 3's ascending and inhibiting the rotation of the ascendingly and descendingly operative part 30 in the direction of the raking part 3's descending. In this combine harvester, the ascendingly impelling force is set so that the force around the swing axis P acting on the support part 12 based on the ascendingly impelling force is made smaller than the force around the swing axis P acting on the support part 12 based on the dead weight of the raking part 3.

Description

  The present invention relates to a combine provided with a scraping portion that scrapes a planted cereal into a cutting portion by rotational driving.

  The scraping part is moved up and down according to the work situation. However, since the scraping part is heavy, it is necessary to apply a large force to swing the support part supporting the scraping part up and down. . Further, since the raising / lowering operation of the scraping unit is performed during the cutting operation, it is preferable that the scraping unit be configured so that it can be easily performed by hand operation in the driving unit.

  Conventionally, for example, in the combine described in Patent Document 1, the support portion (“support arm” in the literature) extends forward from the upper part of the base end side of the cutting portion (“cutting frame” in the literature), A scraping part (in the literature, “rotary reel”) is supported by the front end of the support part so as to be freely rotatable, and the support part can be swung up and down with respect to the cutting part. Is connected to a hydraulic cylinder.

  Moreover, although there is no particular reference, there is also known a combine configured to swing the support portion up and down by electric power such as a motor instead of the above-described hydraulic cylinder.

  With these configurations, the raising and lowering operation of the scraping unit can be easily performed by a hand operation in the operation unit.

JP 2009-39026 A

  However, in the case of a conventional combine, it is necessary to provide a hydraulic unit or electric equipment, electrical wiring, etc. because the posture of the scraping part is changed using a hydraulic cylinder or electric power, and the configuration becomes complicated, There is a risk of increasing assembly man-hours and costs.

  In view of the above circumstances, an object of the present invention is to provide a combine that can raise and lower a scraping portion with a simple and low-cost configuration.

  A first characteristic configuration of the work vehicle according to the present invention includes: a support unit supported by a cutting unit so as to be swingable up and down; a support unit rotatably supported by the support unit; A scraping unit for scraping, a lifting / lowering operation unit that is disposed in the operating unit, winds up a wire linked to the support unit by manual rotation operation, and can raise the scraping unit, and the scraping unit A plurality of locations along the rotational direction of the elevating operation unit that is energized so as to be engaged with the elevating operation unit. The lifting / lowering operation portion can be locked to the lifting / lowering operation portion, and the operation to release the locking can be performed. Allow rotation of the part, and A height adjusting mechanism that prohibits rotation of the elevating operation unit in a direction in which the elevating operation is lowered, and a force around the swing axis of the support unit that acts on the support unit based on the upward biasing force, The rising biasing force is set to be smaller than the force around the pivot shaft acting on the support portion based on the weight of the scraping portion.

  According to this configuration, since the urging mechanism that applies the upward urging force in the direction of raising the scraping portion to the support portion is provided, the load imposed on the lifting operation portion to raise the scraping portion is reduced. Is done. Therefore, it is possible to raise the heavy scraping portion only by manually rotating the lifting operation portion and winding the wire. Then, when the height adjusting mechanism is locked to the lifting / lowering operation unit, rotation of the lifting / lowering operation unit in the direction in which the scraping unit descends is prohibited, and the raised position of the scraping unit is maintained. Further, the force around the swing axis that acts on the support portion based on the upward biasing force of the biasing mechanism is smaller than the force around the swing axis that acts on the support portion based on the weight of the scraping portion. When the locking of the height adjusting mechanism is released, the wound wire is fed out and the scraping portion is lowered based on its own weight.

  Furthermore, since the height adjustment mechanism is urged to be locked to the lifting operation section, if the operation of the lifting operation section is stopped, the height adjustment mechanism is immediately locked to the lifting operation section, and the height adjustment mechanism The wire can be fed out step by step when the operation is released slightly. Therefore, when the rotation operation of the raising / lowering operation unit is stopped or when the height adjustment mechanism is released, the scraping unit does not rapidly drop. Further, fine adjustment of the raising position of the scraping portion is also possible. On the contrary, when raising the scraping portion, it is also possible to raise it gradually in steps.

  In other words, a simple and low-cost configuration that includes an elevating operation unit and a height adjusting mechanism and that links the scraping unit and the elevating operation unit with a wire, without using hydraulic pressure or electric power, Ascending operation, maintaining the ascending position, and descending operation are possible.

  A second characteristic configuration of the work vehicle according to the present invention is that the elevating operation unit includes a handle that is manually rotated, a winding unit around which the wire is wound, and the rotation of the handle is decelerated to the winding unit. And a speed reduction mechanism for transmission.

  If the upward urging force of the urging mechanism is set as large as possible, the force required to rotate the handle can be reduced, but the force around the pivot axis that acts on the support portion based on the weight of the scraping portion increases. The difference between the force around the pivot axis acting on the support portion based on the urging force is reduced, and the descending speed of the scraping portion is reduced. According to this configuration, since the lifting operation unit is provided with the speed reduction mechanism, the load borne by the lifting operation unit is set by conservatively setting the rising biasing force of the biasing mechanism so as to secure the descending speed of the scraping unit to some extent. Even if becomes larger, the force for rotating the handle can be reduced, and the scraping portion can be raised easily.

These are the whole left views of the combine which concerns on this invention. These are top views of the combine which concerns on this invention. FIG. 3 is a cross-sectional plan view of a transport unit. These are the vertical side views of a conveyance part. These are the vertical side views of a threshing apparatus. These are the schematic diagrams which show the linkage relation of a rotating reel and a raising / lowering operation part. These are perspective views which show the structure of a raising / lowering operation part. These are perspective views which show the structure which rotates a driven pulley manually. FIG. 3 is a side view of a chaff sheave configured in a weight sensitive manner. These are sectional drawings of the XX arrow direction shown in FIG. These are the schematic diagrams which show the linkage relation of the rotating reel which concerns on another embodiment, and a raising / lowering operation part.

  Hereinafter, an example in which the present invention is applied to an ordinary (all-fired) combine will be described with reference to the drawings.

[Overall structure of the combine]
The combine according to the present invention harvests rice, wheat and the like, and as shown in FIGS. 1 and 2, a body frame 1 that is a skeleton of the body and a pair of left and right crawler type traveling devices that support the body. 2, a feeder 5 supported on the front part of the machine body frame 1 so as to be swingable up and down, a cutting part 4 connected to the front end of the feeder 5, and a threshing device 6 disposed on the left side of the machine body frame 1, A sacking tank 7 disposed on the right side of the threshing device 6, and an operation unit 8 disposed on the right side of the feeder 5 and the threshing device 6 and on the front side of the bagging tank 7 are provided.

  As shown in FIGS. 1 and 2, the cutting unit 4 is arranged across a pair of left and right dividers 16, a platform 14, a rotating reel 3 as a “scratching unit”, and left and right dividers 16 at the front end of the platform 14. The clipper-type cutting device 17 is provided, and the auger 15 is provided on the platform 14 and rotates about the axis in the left-right direction.

  A hydraulic cylinder 58 is disposed between the machine body frame 1 and the feeder 5 so that the feeder 5 can swing up and down with respect to the threshing device 6 around the axis X in the left-right direction. When the feeder 5 is swung, the cutting unit 4 changes the posture between a working state in which the platform 14 is lowered near the ground and a non-working state in which the platform 14 is raised from the ground.

  The rotary reel 3 is rotatably supported by a reel support portion 12 as a “support portion” supported so as to be swingable up and down around the swing axis P with respect to the cutting portion 4. The rotary reel 3 includes a rotary frame 10 supported by the reel support portion 12 and a plurality of tines 11 supported by the rotary frame 10 so as to face downward at all times and scraping the planted culm to be cut. Yes.

  When the harvesting unit 4 is lowered to a working state and the combine is run, the planted cereal is divided into a harvesting target and a non-reaching target by the divider 16, and the planted grain to be harvested is driven by the rotation of the rotary reel 3. The scissors are clipped by the cutting device 17 while being scraped into the platform 14. The harvested cereal rice cake that has been scraped into the platform 14 is laterally fed forward of the feeder 5 by the auger 15 and further scraped into the feeder 5. The harvested cereal meal is conveyed backward by the feeder 5, and the whole of the harvested grain meal from the head to the tip of the harvested grain meal is put into the threshing device 6.

  The threshing device 6 performs threshing processing by the handling barrel 40 that rotates the harvested cereal meal that has been input. The cerealized unigrained grains are sent to the bagging tank 7 and temporarily stored, and discharged from the lower part of the bagging tank 7 to the grain bags. On the right side surface of the machine body frame 1, a work stage 7A for carrying out bagging work from the bagging tank 7 and a frame 7B serving as a handrail for workers on the work stage 7A are arranged around the axis in the front-rear direction. Is arranged so as to be swingable. When the bagging operation is not performed, the operation stage 7A and the frame 7B are stood vertically and stored.

〔Ogre〕
As shown in FIG. 3, the auger 15 includes a first spiral 15 a and a second spiral 15 b that are two spirals on the right side of the feeder 5, and a single third spiral 15 c on the left side of the feeder 5. 5 is provided with a plurality of scraping rods 15d protruding in the radial direction. The first spira 15a, the second spira 15b, and the third spirer 15c are used to feed the harvested cereal potatoes to the front of the feeder 5, and the spires 15d are raked into the feeder 5.

  When the object to be harvested is a long crop, the harvested cereal wraps around the auger 15 to cause vibration, and the bearing portion of the auger 15 may be worn. If the diameter of the auger 15 is increased and the perimeter is lengthened, the seizure of the harvested cereal rice cake is reduced. However, there is a possibility that the weight increases and the balance of the fuselage is deteriorated or the cost is increased. . In the present embodiment, as described above, since the first spira 15a and the second spira 15b are configured in a double spiral, the spiral interval of one spiral is divided by the spiral of the other spiral and becomes smaller. As a result, although the overall conveyance efficiency does not decrease, the amount of the harvested cereal mash carried by each spira is halved, and the wrapping of the harvested cereal cocoon around the auger 15 is reduced.

〔feeder〕
As shown in FIG. 3 and FIG. 4, the feeder 5 includes a feeder case 50 and a conveyor unit 52 built in the feeder case 50. The conveyor unit 52 is wound around a front ring body 52a and a rear ring body 52b that are supported by the feeder case 50 so as to be rotatable about an axis in the left-right direction, and the front ring body 52a and the rear ring body 52b. A pair of left and right chains 52c and a left-right direction angle 52d disposed across the left and right chains 52c are provided. Further, a driven pulley 53 is provided on the outside of the feeder case 50 so as to be able to rotate integrally with the rear ring body 52b on the same axis as the rotation axis of the rear ring body 52b. As shown in FIG. 5, the driven pulley 53 is linked by a drive pulley 54 and a belt 55 disposed on the side of the machine body. Thereby, the power from the engine is transmitted to the driven pulley 53 via the drive pulley 54, and the feeder 5 is driven. Further, a tension pulley 56 is provided so that the belt 55 does not slack. Although not shown, the power transmitted from the engine to the cutting input shaft 53A that supports the driven pulley 53 is transmitted to the rotary reel 3, the auger 15, and the cutting device 17.

  When the driving force is transmitted from the driving pulley 54 to the driven pulley 53, the conveyor unit 52 is driven, and the harvested cereal rice cake that has been raked by the rake rod 15d is hooked on the angle 52d and conveyed backward.

  As shown in FIG. 4, a cleaning port is opened on the bottom surface of the feeder case 50 in the vicinity of the front end portion of the feeder 5, and a cleaning port cover 51 is detachably disposed with respect to the cleaning port with a bolt or the like. When the harvested cereal grains etc. are clogged inside the feeder 5, the cleaning port cover 51 is removed, the driven pulley 53 is manually rotated by the handle 57 (see FIG. 8), and the conveyor unit 52 is rotated in the reverse direction. Take out stuffed harvested cereals. In order to manually operate the driven pulley 53, it is necessary to loosen the tension pulley 56 or remove the belt 55.

  As shown in FIG. 8, the driven pulley 53 is formed with a plurality of cavities 53 a that open in the axial direction, and the front end of the handle 57 is provided with two locking portions 57 a. When the engaging portion 57a is fitted in different cavities 53a across the rotation axis of the driven pulley 53 and the handle 57 is rotated, the engaging portion 57a is engaged with the cavities 53a and the driven pulley 53 rotates. . The handle 57 is fixed to, for example, a clamp disposed on the upper surface of the feeder case 50 when not in use.

  By configuring in this way, the harvester cereals packed in the feeder 5 by simply rotating the conveyor unit 52 in the reverse direction without adopting a special drive mechanism or drive structure for rotating the conveyor unit 52 in reverse. Can be taken out.

[Threshing equipment]
As shown in FIG. 5, the threshing device 6 includes a threshing unit 6A that threshs the harvested cereal mash (unthreshed cereal mash) conveyed by the feeder 5, and a sorting unit 6B that performs a sorting process on the processed product obtained by the threshing process. And.

  The threshing unit 6A includes a handling cylinder 40 that rotates about a front and rear axis. A plurality of tooth handling support members 40a arranged at regular intervals in the circumferential direction in a posture along the rotation axis of the handling barrel 40, and disposed on the tooth handling support member 40a and facing outward of the handling barrel 40. A handling cylinder 40 is constituted by a plurality of protruding teeth 40b, which is a bar-type handling cylinder 40. The front portion of the handling cylinder 40 is provided with a screw-type scraping portion. Further, the threshing portion 6A includes a U-shaped receiving net 41 as viewed in the front-rear direction covering the handling cylinder 40 from below.

  Unthreshed cereals are threshed by striking the tooth-handling support member 40a and the tooth-handling 40b, or biting the tooth-handling 40b. A part of the processed material enters the internal space of the barrel 40, and the processed material in the external space of the cylindrical barrel 40 and the processed material in the internal space are further agitated by the rotation of the cylindrical barrel 40, and further the tooth handling support member. Threshing processing is performed by striking 40a and tooth-handling 40b.

  The sorting unit 6B includes a sheave case 42 that swings in the front-rear direction by the operation of the eccentric cam type drive mechanism 43 provided at the rear end portion, and swings and sorts the processed material. The sheave case 42 receives the processed material leaked from the receiving net 41 while swinging, and sifts and sorts the received processed material as a processing object to be selected while moving it to the rear of the machine body. In addition, the sorting unit 6B includes a tang 44 that is rotated around the axis of the left-right direction to generate a sorting wind and wind-sorts the processed material at the front lower side of the sheave case 42.

  The sorting unit 6 </ b> B includes a first recovery unit 46 below the sheave case 42, and a second recovery unit 47 below the sheave case 42 and behind the first recovery unit 46. The first recovery unit 46 recovers the single grain that has flowed down from the sheave case 42 as the first thing, and sends it to the bagging tank 7 via a lifting screw (not shown). The second recovery unit 47 recovers the grain with branches and the like flowing down from the sheave case 42 as a second product and sends it to a reprocessing unit (not shown) via a second reduction mechanism (not shown). The processed product threshed by the reprocessing unit is returned to the sheave case 42.

  On the upper portion of the sheave case 42, a rough sorting grain pan 45A, a chaff sheave 45B, and a stroller 45C are sequentially provided from the upper side in the sorting process direction. Further, a fine sorting grain pan 45D and a grain sieve 45E are sequentially provided from the upper side in the sorting process direction at the lower part of the sheave case 42.

  The chaff sheave 45B is constituted by a plurality of chaff flip plates 60 that are aligned at a predetermined interval in the front-rear direction. Then, as shown in FIGS. 9 and 10, all the char flip plates 60 are connected by a connecting member 63, and are configured to swing simultaneously and uniformly. Thereby, the opening degree of the path | route through which a processed material flows down can be adjusted.

  In the present embodiment, the sorting unit 6B is made of resin except for at least a portion serving as a bearing among the sheave case 42, the char flip plate 60, and the stroller 45C. As a result, the weight is reduced, the vibration is reduced, the burden on the bearing portion is reduced, and the durability is improved. In addition, it is more resistant to wetting than when it is made of sheet metal.

[Weight-sensitive chaff sheave]
In this embodiment, the structure which adjusts the opening degree of the chaff sheave 45B automatically by the weight of the processed material is adopted. Below, the mechanism which adjusts the opening degree of the chaff sheave 45B is demonstrated based on FIG. 9, FIG.

  As shown in FIG. 10, the left and right ends of the upper end portion of the char flip plate 60 are swingably supported by a bracket 42a fixed to the inner surface of the sheave case 42 via a support shaft 61. One of the left and right end portions of the lower end portions of all the char flip plates 60 is connected by a connecting member 63 via a swing pin 62. Accordingly, the lower ends of all the char flip plates 60 are restricted by the connecting member 63 and can be swung around the respective spindle pins 61 simultaneously and uniformly. When the char flip plate 60 swings upward (becomes horizontal), the lower end portions of the char flip plate 60 come close to each other, and the path through which the processed material flows down becomes small. That is, the opening degree of the chaff sheave 45B is reduced. Conversely, when the cha-flip plate 60 swings downward, the lower ends of the cha-flip plate 60 are separated from each other, and the path through which the processed material flows down increases. That is, the opening degree of the chaff sheave 45B is increased. When the chaff flip plate 60 is vertical, the opening of the chaff sheave 45B is maximized.

  As shown in FIGS. 9 and 10, for one of the cha-flip plates 60, the extension pin 64 is connected to the swing pin 62, and the extension pin 64 is passed through the third opening 42 c opened in the sheave case 42. It protrudes to the outside of the sheave case 42. The third opening 42c has a margin in consideration of the swing locus of the extension pin 64 centered on the support shaft pin 61 so as not to hinder the swing operation of the cha-flip plate 60 centering on the support shaft pin 61. Formed. One end of a spring 69, which will be described later, is fixed to the outer end of the extension pin 64, and the cha-flip plate 60 is always urged so as to swing upward (become horizontal). In other words, the chaff sheave 45B is always urged toward the side where the opening is reduced.

  As shown in FIG. 10, in the sheave case 42, a boss portion 42 b is formed by projecting the vicinity of the middle (see FIG. 9) in the side view of the extension pin 64 and the corresponding spindle pin 61 outward. is there. The shaft core pin 71 is inserted into the boss portion 42b from the inside of the sheave case 42, and the end portion of the shaft core pin 71 is projected from the boss portion 42b. A second plate 67, a first plate 66, and a balance weight 68 are supported on the protruding portion in order from the inside via a spacer 72 between the members. The second plate 67, the first plate 66, and the balance weight 68 are individually swingable along the outer surface of the sheave case 42 with the shaft core pin 71 (shaft core Y) as a center.

  The balance weight 68 includes a plate portion 68b supported by the shaft core pin 71, and a weight portion 68a fixed to an end portion of the plate portion 68b. The balance weight 68 is connected to the balance weight 68 via the extension pin 64 and the swing pin 62 so as to prevent the cha-flip plate 60 from swinging unexpectedly due to the inertia based on the swing motion of the sheave case 42 by the drive mechanism 43. A moment force around the axis Y based on the weight is applied to the char flip plate 60. By the swinging operation of the first plate 66, the biasing force of the spring 69 that biases the char flip plate 60 to the horizontal side can be adjusted. By swinging the second plate 67, the swing limit to the horizontal side (upward) of the char flip plate 60 can be changed, thereby making it possible to adjust the minimum opening of the chaff sheave 45B.

  A first opening 66a or a second opening 67a through which the extension pin 64 is inserted is opened in the first plate 66 and the second plate 67, respectively. The first opening 66a and the second opening 67a do not hinder the swing operation of the cha-flip plate 60 centered on the support shaft pin 61, and the swing operation of the center of the shaft Y is extended. In order not to be obstructed by the pin 64, the swing trajectory of the extension pin 64 centered on the support shaft pin 61 and the relative swing trajectory of the extension pin 64 centered on the axis Y based on its own swing motion. It is formed with a margin in consideration.

  A fourth opening 68 c through which the extension pin 64 is inserted is also opened in the plate portion 68 b of the balance weight 68. If the extension pin 64 can move relative to the fourth opening 68c in the circumferential direction around the axis Y, the above-described inertia swing of the cha-flip plate 60 cannot be suppressed. Therefore, the fourth opening 68c has a long hole shape along the radial direction with the axis Y as the center. The extension pin 64 is inserted into the fourth opening 68c in a state where the cylindrical collar member 65 is rotatably inserted into the extension pin 64. The width of the fourth opening 68 c in the short side direction is slightly larger than the outer diameter of the collar member 65. Since the swing center of the balance weight 68 (axial core Y) and the swing center of the extension pin 64 (axial core of the support pin 61) are eccentric, the extension pin 64 is longitudinal with respect to the fourth opening 68c. Need to slide along. At this time, since the collar member 65 rotates in contact with the fourth opening 68c, the extension pin 64 can smoothly move relative to the fourth opening 68c.

  As shown in FIG. 9, the first plate 66 includes a bent portion 66 d that extends on one side with the shaft core Y in between and bends its end. The first plate 66 includes a first operation portion 66b that extends on the other side with the axis Y interposed therebetween. The other end of the spring 69 having one end fixed to the end of the extension pin 64 is fixed to the bent portion 66d. That is, when the first plate 66 is swung, the other end of the spring 69 moves along a locus centering on a point (axial core Y) different from the one end.

  9, when the first plate 66 is swung clockwise, the bent portion 66d (the other end of the spring 69) is separated from the extension pin 64 (one end of the spring 69), and the spring 69 is extended. . On the other hand, when the first plate 66 is swung counterclockwise on the paper surface of FIG. 9, the bent portion 66d (the other end of the spring 69) approaches the extension pin 64 (one end of the spring 69), and the spring 69 is contracted. The Thus, the biasing force of the spring 69 can be adjusted by adjusting the amount of tension of the spring 69 by the swinging operation of the first plate 66. The spring 69 is a tension spring and has a biasing force toward the contracting side.

  A flat engagement plate 70 is fixed to the outside of the sheave case 42. On the outer surface of the engagement plate 70, a plurality of engagement protrusions 70a are formed to protrude. The engagement protrusion 70a is arranged on an arc centered on the axis Y, and the first engagement hole 66c opened in the first operation portion 66b is engaged with any of the engagement protrusions 70a. Thus, the swing position of the first plate 66 can be selectively fixed. The first plate 66 is formed so thin that it can be bent in the left-right direction in FIG. Thereby, the first plate 66 can behave like a leaf spring. If the first plate 66 is manually bent in the right direction in FIG. 10 with the shaft pin 71 as a fulcrum with the first operation portion 66b, the first engagement hole 66c is removed from the engagement protrusion 70a, It can be engaged with another engaging protrusion 70a.

  The second plate 67 restricts further upward swinging of the extension pin 64 when the extension pin 64 comes into contact with the upper end portion of the second opening 67 a via the collar member 65. Thereby, the horizontal swing of the chaff flip plate 60 is restricted, and the minimum opening of the chaff sheave 45B is determined.

  When the second plate 67 is swung clockwise on the paper surface of FIG. 9, the swing limit of the chaff plate 60 toward the horizontal side approaches the horizontal side, and the minimum opening of the chaff sheave 45B can be reduced. On the other hand, when the second plate 67 is swung counterclockwise on the paper surface of FIG. 9, the swing limit of the chaff plate 60 to the horizontal side is far from the horizontal side, and the minimum opening of the chaff sheave 45B is increased. it can.

  Similar to the first plate 66, the second plate 67 includes a second operation portion 67 b extending from the engagement plate 70 side. By engaging the second engagement hole 67 c opened in the second operation portion 67 b with any of the engagement protrusions 70 a of the engagement plate 70, the swing position of the second plate 67 is selectively fixed. be able to. If the second plate 67 is manually bent in the right direction in FIG. 10 with the shaft pin 71 as a fulcrum with the second operation portion 67b, the second engagement hole 67c is removed from the engagement protrusion 70a, It can be engaged with another engaging protrusion 70a.

  With the above-described configuration, the cha-flip plate 60 automatically swings in response to the weight of the processed material, and not only the chaff sheave 45B has an appropriate opening degree according to the weight of the processed material, but also the selective shaking of the sheave case 42. The opening is stable without being affected by the dynamic operation, and the urging force and the minimum opening of the spring 69 can be easily adjusted manually.

[Operation section]
As shown in FIGS. 1 and 2, the driving unit 8 includes a driving seat 82 disposed at the rear center, a front panel 80 erected at the front end, and a side panel 81 erected at the left end. And. The front panel 80 is provided with a steering lever 83 and the like. By swinging the steering lever 83 to the left and right, the left and right traveling devices 2 can be driven at different speeds to perform a right turn and a left turn. The side panel 81 is provided with a main transmission lever 84 and a sub transmission lever 85 for controlling the vehicle traveling speed including forward / reverse switching.

[Rotating reel lifting structure]
As described above, the rotary reel 3 is rotatably supported by the reel support portion 12 as shown in FIGS. 1 and 2, and includes a rotary frame 10 and a plurality of tines 11. By rotating the reel support portion 12 up and down around the swing axis P, the rotary reel 3 can be moved up and down. For example, at the time of a normal cutting operation, the rotary reel 3 is greatly lowered, and the planted culm is scraped into the platform 14 as described above. Adjustment of the height of the rotating reel 3 in the lowered state is performed according to the situation such as the type of crop, the length of the culm and the level of lodging. For example, as is clear from FIG. 1, when the rotary reel 3 is lowered, the front end of the rotary reel 3 moves forward. Do. Further, when the rotary reel 3 is lifted greatly, a space between the rotary reel 3 and the platform 14 becomes large and it is easy to see the front uncut area.

  Hereinafter, a structure for raising and lowering the rotary reel 3 will be described with reference to FIGS. 6 and 7 in particular.

  As shown in FIG. 6, the reel support portion 12 includes a swing shaft member 12 c that is rotatably fixed to the cutting portion 4 in a posture in the left-right direction of the machine body along the swing shaft core P, and a swing shaft member 12 c. A pair of left and right reel support rods 12b coupled to the left and right ends, a drive shaft member 12a rotatably supported across the left and right reel support rods 12b, and a swing shaft member 12c. And a bracket 12d fixed to the left and right intermediate portions in the rearward direction. The reel support rod 12b is swung up and down around the swing axis P by applying a rotational operation force of a lifting operation unit 30 described later to the bracket 12d.

  As shown in FIGS. 1 and 6, a gas spring 13 as an “urging mechanism” is disposed between the cutting unit 4 and the left and right reel support rods 12 b. In detail, the gas spring 13 includes the left and right reels extending across the middle portion in the front-rear direction of the left and right side wall portions 14a of the platform 14 and the rear end side portion of the middle portion of the reel support rod 12b in the front-rear direction. It is arranged in a state of being positioned directly below the support rod 12b and in an upright posture. Although the gas spring 13 has a well-known configuration and will not be described in detail, the gas spring 13 has a property of gradually contracting with respect to a downward load while applying an upward biasing force to the reel support rod 12b. .

  The upward biasing force of the gas spring 13 is a swinging force in which the force around the swing axis P acting on the reel support portion 12 based on the upward biasing force acts on the reel support portion 12 based on the weight of the rotating reel 3. The force is set to be smaller than the force around the axis P.

  As shown in FIGS. 6 and 7, in the operation unit 8, an elevating operation unit 30 is disposed at the lower right side of the side panel 81. The raising / lowering operation unit 30 includes a handle 31 that can be manually rotated around an axial center in the left-right direction, a speed reduction mechanism 33 that is connected to the handle 31 via a shaft 32 and decelerates the rotation of the handle 31, and a “wire” described later. And a take-up portion 35 for winding the release wire 20. The handle 31 is disposed outside the side panel 81 so that it can be operated from the driving unit 8, and the speed reduction mechanism 33 and the like are disposed inside the front panel 80 and the side panel 81.

  The release wire 20 includes an inner wire 21 that links the speed reduction mechanism 33 and the bracket 12d, and an outer wire 22 that has both ends fixed to the front panel 80 and the cutting unit 4, respectively. The release wire 20 connected to the bracket 12 d is connected to the speed reduction mechanism 33 from the lower side of the side panel 81 through the lateral side of the feeder 5. The speed reduction mechanism 33 includes a first gear 33a that rotates about the same axis as the rotation axis of the handle 31 via the shaft 32, and a second gear 33b that has a larger diameter and a larger number of teeth than the first gear 33a. The chain 33c is wound around the first gear 33a and the second gear 33b. The winding portion 35 rotates integrally on the same axis as the second gear 33b.

  By manually rotating the handle 31 counterclockwise, the inner wire 21 is wound around the winding portion 35 and a downward tensile force acts on the bracket 12d. As a result, the reel support portion 12 swings upward around the swing axis P, and the rotary reel 3 rises. By rotating the handle 31 clockwise, the inner wire 21 wound around the winding portion 35 is fed out, and the downward tensile force acting on the bracket 12d is weakened. As a result, the reel support portion 12 swings downward around the swing axis P, and the rotary reel 3 is lowered.

  A so-called ratchet mechanism is employed as a structure for fixing the rotational position of the handle 31. The rotation operation unit includes a locking gear 34 that is fixed between the handle 31 and the first gear 33a of the shaft 32 and has a plurality of teeth. Each tooth of the locking gear 34 is set so that the surface on the clockwise side (the side on which the rotating reel 3 descends) has an acute angle with respect to the circumferential direction, while the counterclockwise side (rotation) The surface on the side where the reel 3 rises is set to be obtuse with respect to the circumferential direction. On the rear side of the locking gear 34, there is provided a locking lever 36 that can swing in the front-rear direction and that can be locked on the clockwise surface of the locking gear 34 when it swings forward. One end side of the locking lever 36 is swingably supported by the side panel 81, and the other end side is formed in an acute shape so that it can be locked to the clockwise side surface of the locking gear 34. . A spring 38 is disposed between the intermediate portion of the locking lever 36 and the side panel 81, and the locking lever 36 is biased to be locked to the locking gear 34 by the biasing force of the spring 38.

  Further, the distance between the swing center of the locking lever 36 and the rotation axis of the locking gear 34 is set to be smaller than the total of the swing radius of the locking lever 36, the locking gear 34 and the rotation radius. A stop gear 34 and a locking lever 36 are configured. Therefore, in a state where the locking lever 36 is locked to the locking gear 34, the other end of the locking lever 36 is engaged even if a rotational operation force is applied clockwise (direction in which the rotating reel 3 is lowered) to the handle 31. The handle 31 does not rotate by biting between the teeth of the stop gear 34.

  On the other hand, even when the locking lever 36 is locked to the locking gear 34, when a rotational operation force is applied to the handle 31 counterclockwise (in the direction in which the rotary reel 3 is raised), the other end of the locking lever 36 is While resisting the biasing force of the spring 38, the handle 31 is rotated by being guided by the surface of the locking gear 34 on the counterclockwise side and overcoming the teeth one after another. When the rotation operation of the handle 31 is stopped, the locking lever 36 is locked to the locking gear 34 by the urging force of the spring 38. That is, the locking lever 36 corresponds to the “height adjustment mechanism” according to the present invention.

  According to the above configuration, the gas spring 13 reduces the load imposed on the driver to raise the rotating reel 3, and the rotating reel 3 is heavy only by manually rotating the handle 31 and winding the inner wire 21. Can be raised. Then, when the locking lever 36 is locked to the locking gear 34, the raised position of the rotary reel 3 is maintained. Moreover, if the latching of the latching lever 36 is cancelled | released, the wound inner wire 21 will be drawn | fed out and the rotating reel 3 will descend | fall based on own weight.

  Further, since the locking lever 36 is urged to be locked to the locking gear 34, the locking lever 36 is locked to the locking gear 34 as soon as the operation of the handle 31 is stopped. If 36 is released slightly, the inner wire 21 can be fed out step by step. Therefore, when the rotation operation of the handle 31 is stopped or when the locking lever 36 is released, the rotary reel 3 does not drop rapidly. In addition, fine adjustment of the raised position of the rotary reel 3 is possible.

  Note that, as described above, only the handle 31 of the lifting operation unit 30 is exposed from the side panel 81 to the driver seat 82 side. The locking lever 36 includes a knob 37 that protrudes toward the driver's seat 82 and can be manually operated. Only the knob 37 is exposed from the side panel 81 toward the driver's seat 82. Further, the handle 31 and the knob 37 are disposed around the lower part of the main transmission lever 84. For this reason, there are few erroneous operations, and it is easy to operate the handle 31 and the knob 37 while operating the steering lever 83 with the right hand during the cutting operation.

[Another embodiment]
(1) In the above-mentioned embodiment, although the example which applied the gas spring 13 as an urging | biasing mechanism was shown, it is not restricted to this. For example, as shown in FIG. 11, a pair of left and right first springs 113A as a compression spring having a biasing force in the extending direction is provided between the left and right reel support rods 12b and the cutting unit 4, and the bracket 12d and the cutting unit are provided. 4, a second spring 113B as a tension spring having an urging force in a contracting direction may be provided. In addition, although not shown, only one of the first spring 113A and the second spring 113B in FIG. 11 may be provided. However, if both the first spring 113A and the second spring 113B are provided, the load borne by each spring is small, and the biasing force of the spring can be easily set. Further, as the urging mechanism, a spring provided in a tea cylinder member, a hydraulic damper, or the like may be employed.

(2) In the above-described embodiment, the speed reduction mechanism 33 is constituted by the first gear 33a, the second gear 33b, and the chain 33c, but is not limited to this, and various known speed reduction mechanisms can be employed. Although not shown, for example, a speed reduction mechanism including a gear linkage of only a small diameter gear and a large diameter gear may be used.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a combine provided with a scraping unit that scrapes a planted cereal into a cutting unit by rotational driving.

3 Rotating reel (scratching part)
4 Cutting part 8 Operating part 12 Reel support part (support part)
13 Gas spring (biasing mechanism)
20 Release wire (wire)
30 Lifting operation part 31 Handle 33 Deceleration mechanism 35 Winding part 36 Locking lever (height adjustment mechanism)
P Oscillating shaft core

Claims (2)

A support part supported by the mowing part so as to swing up and down;
A scraping unit that is rotatably supported by the support unit, and that scrapes the planted cereal into the reaping unit by rotational driving;
An elevating operation unit that is disposed in the operation unit, winds up a wire linked to the support unit by a manual rotation operation, and is capable of raising the scraping unit;
An urging mechanism for applying an upward urging force in a direction to raise the scraping portion to the support portion;
An operation that is urged to be locked with respect to the lifting / lowering operation unit and that can be locked with respect to the lifting / lowering operation unit at a plurality of locations along the rotation direction of the lifting / lowering operation unit and that releases the locking. When it is locked to the lifting / lowering operation part, the lifting / lowering operation in the direction in which the scraping part is allowed to rotate and the scraping part in the direction in which the scraping part is lowered is permitted. A height adjustment mechanism that prohibits rotation of the part,
The force around the pivot axis of the support portion acting on the support portion based on the upward biasing force is greater than the force around the pivot axis acting on the support portion based on the weight of the scraping portion. Combine with the above-mentioned upward biasing force set to be smaller.   2. The lifting operation unit includes a handle that is manually rotated, a winding unit around which the wire is wound, and a reduction mechanism that transmits the rotation of the handle to the winding unit at a reduced speed. Combine as described.

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