CN108990518B

CN108990518B - Combine harvester

Info

Publication number: CN108990518B
Application number: CN201810575322.7A
Authority: CN
Inventors: 梅林竜司
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2017-06-06
Filing date: 2018-06-06
Publication date: 2022-06-14
Anticipated expiration: 2038-06-06
Also published as: KR102593807B1; CN108990518A; KR20180133324A

Abstract

Provided is a combine harvester which can conveniently maintain a threshing cylinder. A combine harvester is provided with: a threshing cylinder frame (44) which supports the threshing cylinder (11) and can swing up and down around a swing axis extending in the front-back direction of the machine body; and a straw rack (55) which supports the straw conveying device (12) and can swing up and down around a swing axis extending along the front-back direction of the machine body. When the straw rack (55) is at the lowered position, the threshing cylinder rack (44) can be raised.

Description

Combine harvester

Technical Field

The present invention relates to a combine harvester, which comprises: a feeding chain for clamping and conveying the cut grain stalks; a threshing device which threshes the cut and taken rice straws conveyed by the feeding chain through a threshing cylinder; and the straw conveying device is connected with the rear side of the threshing device, collects the threshed straws from the feeding chain and clamps and conveys the straws to the rear side.

Background

As such a combine harvester, for example, a combine harvester described in patent document 1 is known. The combine harvester described in patent document 1 includes: a feeding chain (9) in the literature) which clamps and conveys the cut grain stalks; a threshing device (a threshing part (7) in the literature) for performing a threshing process on the harvested straws conveyed by the feeding chain by a threshing cylinder (13) in the literature); and a straw conveying device (11) in the literature) which is connected and arranged at the rear side of the threshing device, collects the straw after the threshing treatment from a feeding chain and clamps and conveys the straw to the rear side. Further, the combine harvester described in patent document 1 includes: a threshing cylinder frame (a cover (23) in the literature) which supports a threshing cylinder and is vertically swingable around a swing axis (a support shaft (24) in the literature) extending in the front-rear direction of the machine body; and a straw rack (a cover (23) in the literature) which supports the straw conveying device and can swing up and down around a swing shaft center (a support shaft (24) in the literature) extending along the front and back directions of the machine body.

Further, the combine harvester described in patent document 1 includes: a straw rack (a cover (23) in the literature) which supports the straw conveying device and is capable of swinging up and down around a swinging axis (a supporting shaft (24) in the literature) extending along the front-back direction of the machine body; and a lock mechanism (in the literature, "lock mechanism (25)") for holding the position of the straw rack in a state where the straw rack is at the lowered position.

As such a combine harvester, for example, a combine harvester described in patent document 2 is also known. The combine harvester described in patent document 1 includes: a feeding chain (in literature, "feeding chain (2)") which clamps and conveys the cut grain stalks; a threshing device (in the literature, "thresher (1)") for threshing the harvested straws transported by the feeding chain by a threshing cylinder (in the literature, "threshing cylinder (5)"); a straw conveying device (in the literature, "straw conveying device (15)") which is connected to the rear side of the threshing device, collects the straw after the threshing process from the feeding chain, and conveys the straw to the rear side. "in addition, the combine harvester described in patent document 1 includes: a straw rack (in the literature, a "stalk root side support frame (31)") which supports the straw conveying device and is capable of swinging up and down around a swinging axis (in the literature, a "rotating shaft (45)") extending along the front and back directions of the machine body; a belt transmission mechanism (in the literature, "belt transmission mechanism (18)") which is provided across a transmission shaft (in the literature, "threshing cylinder shaft (5)") for transmission of the driving force of the engine and the input shaft of the straw conveying device and transmits the power of the transmission shaft to the input shaft. A belt transmission mechanism of a combine harvester comprises: the tension device comprises a driving pulley arranged on a transmission shaft, a driven pulley arranged on an input shaft, a transmission belt wound on the driving pulley and the driven pulley, a tension arm supported on a supporting shaft in a swinging mode, and a tension pulley supported on the tension arm and used for applying tension to the transmission belt.

Documents of the prior art

Patent literature

Patent document 1: japanese unexamined patent application publication No. 2010-11748

Patent document 2: japanese unexamined patent publication No. 2012-50339

In the combine harvester described in patent document 1, when the threshing cylinder frame is raised, the straw frame is also raised. In this case, even when only the threshing cylinder is maintained, the straw conveying device is lifted together with the threshing cylinder, and therefore, an unnecessary work (for example, removal of straw from the straw conveying device) due to the periphery of the straw conveying device being opened is likely to occur.

In the combine harvester described in patent document 1, since the lock mechanism is provided at a position close to the pivot axis, the free end side portion of the straw rack is likely to shake while the straw rack is held at the lowered position.

In the combine harvester described in patent document 2, only one tension pulley must be provided, and a support shaft dedicated to the tension arm must be provided. Therefore, there is room for improvement in the point of effectively applying tension to the transmission belt and in the point of reasonably configuring the support structure of the tension pulley.

Disclosure of Invention

In view of the above, a combine harvester that facilitates maintenance of the threshing cylinder is desired.

The present invention is characterized by comprising:

a feeding chain for clamping and conveying the cut grain stalks;

a threshing device for threshing the cut and taken rice straws conveyed by the feeding chain through a threshing cylinder;

the straw conveying device is connected with the rear side of the threshing device, collects the threshed straws from the feeding chain and clamps and conveys the straws to the rear side;

a threshing cylinder frame which supports the threshing cylinder and can swing up and down around a swing axis extending in the front-back direction of the machine body;

a straw rack which supports the straw conveying device and can swing up and down around a swing axis extending along the front and back directions of the machine body;

when the straw rack is at the descending position, the threshing cylinder rack can be lifted.

According to this characteristic structure, even if the threshing cylinder frame is raised, the straw frame is not raised from the lowered position. Therefore, when only the threshing cylinder is maintained, the straw conveying device does not rise together with the threshing cylinder, and thus inconvenience that the periphery of the straw conveying device is opened can be avoided. That is, according to the characteristic structure, the combine harvester which can conveniently maintain the threshing cylinder can be realized.

Further, in the present invention, the first and second substrates,

preferably, the descending position is a position where the straw conveying device conveys the straws.

According to this characteristic structure, even if the threshing cylinder frame is raised, the straw frame is not raised from the position where the straw conveying device conveys the straw. Therefore, the straw conveying device can maintain the state of clamping the straws, so that the straws are not scattered.

Further, in the present invention, the first and second substrates,

preferably, the straw frame can be lifted in a state where the threshing cylinder frame is lifted.

According to the characteristic structure, the straw rack can be lifted to maintain the straw conveying device.

Further, in the present invention, the first and second substrates,

preferably, the rising angle of the straw frame is smaller than that of the threshing cylinder frame.

In general, when removing grain stalks stuck in a threshing cylinder, it is necessary to raise the threshing cylinder to a position that is high to some extent, while when removing stalks stuck in a stalk conveyor, it is less necessary to raise the threshing cylinder to a position that is high like the threshing cylinder. According to this characteristic structure, the rising angle of the straw rack can be appropriately set according to the characteristics of the straw conveying device.

Further, in the present invention, the first and second substrates,

preferably, in a state where the threshing cylinder frame and the straw frame are lifted, the straw frame and the threshing cylinder frame may be selectively lowered integrally or the straw frame and the threshing cylinder frame may be independently lowered separately.

According to this characteristic structure, for example, when maintenance of the threshing cylinder and the straw conveyor is completed, the straw rack and the threshing cylinder rack are lowered integrally, so that it is not necessary to take much time and effort to lower the straw racks, respectively. Further, when only the maintenance of the straw conveyor is completed, the straw rack and the threshing cylinder rack are independently lowered, so that the threshing cylinder rack can be maintained in a raised state for continuing the maintenance of the threshing cylinder.

In addition, a combine harvester capable of stably holding the straw rack in a lowered position is also desired.

The present invention is characterized by comprising:

a feeding chain for clamping and conveying the cut grain stalks;

a side frame provided at a side portion of an outer side of the body in a left-right direction of the body in the threshing device;

and a plurality of locking mechanisms for holding the free end side part of the straw rack at the position of the side rack in the state that the straw rack is at the descending position.

The side frame is a member having high rigidity that constitutes the side of the threshing device. According to this characteristic configuration, in a state where the straw rack is located at the lowered position, a plurality of places on the free end side portion of the straw rack can be stably held at the positions of the side racks having high rigidity. In addition, the free end side part of the straw rack is difficult to shake under the state that the straw rack is kept at the position. That is, according to the present characteristic configuration, it is possible to realize a combine harvester capable of stably holding the position of the straw frame in a state where the straw frame is located at the lowered position.

Further, in the present invention, the first and second substrates,

preferably, the locking mechanisms are respectively arranged at the front part and the rear part in the free end side part of the straw rack.

According to this characteristic structure, the position of the free end side portion of the straw rack can be held in a state where the straw rack is less likely to shake back and forth.

Further, in the present invention, the first and second substrates,

preferably, the straw frame is a frame-shaped component,

the locking mechanism is positioned in the frame of the straw rack in a state of keeping the free end side part of the straw rack at the position of the side rack.

According to this characteristic structure, the locking mechanism does not protrude outside the frame of the straw frame, so that the locking mechanism is difficult to interfere at the outside of the machine body in the left-right direction of the machine body.

Further, in the present invention, the first and second substrates,

preferably, the lock mechanism has: a shaft member provided on either one of the straw holder and the side holder; a support member provided on the other of the straw rack and the side rack and supporting the shaft member in a state where the straw rack is located at the lowered position; and a hook that engages with the shaft member in a state where the shaft member is supported by the support member.

According to this characteristic configuration, the shaft member is less likely to shake due to the hook engaging with the shaft member supported by the support member, and the engagement state of the lock mechanism is stable.

Further, in the present invention, the first and second substrates,

preferably, the lock mechanism includes a lever that is manually operated to switch the hook between an engagement position where the hook is engaged with the shaft member and a non-engagement position where the hook is not engaged with the shaft member.

According to this characteristic configuration, the operator can easily switch the lock mechanism between the engaged state and the disengaged state only by manually operating the joystick.

Further, in the present invention, the first and second substrates,

preferably, the locking mechanism does not protrude further downward than the lower end of the side frame.

According to this feature, the lock mechanism does not protrude downward than the side frame to interfere therewith.

Further, a combine harvester capable of effectively applying tension to the drive belt and reasonably configuring a support structure for the tension pulley is desired.

The present invention is characterized by comprising:

a feeding chain for clamping and conveying the cut grain stalks;

the straw conveying device is connected and arranged at the rear side of the threshing device, collects the threshed straws from the feeding chain and clamps and conveys the straws to the rear side;

a straw rack which supports the straw conveying device and can swing up and down around a swing axis extending along the front-back direction of the machine body;

a belt transmission mechanism which is arranged across a transmission shaft transmitting the driving force of an engine and an input shaft of the straw conveying device and transmits the power of the transmission shaft to the input shaft;

The belt transmission mechanism has: a drive pulley provided on the drive shaft, a driven pulley provided on the input shaft, a transmission belt wound around the drive pulley and the driven pulley, a tension arm swingably supported on the drive shaft, a swing-side tension pulley supported on the tension arm and applying tension to the transmission belt, and a fixed-side tension pulley supported on the straw holder and applying tension to the transmission belt.

According to this characteristic configuration, the transmission belt can be effectively tensioned by the swinging side tension pulley and the fixed side tension pulley. Further, the support structure of the swing-side tension pulley and the fixed-side tension pulley can be rationally configured by using the transmission shaft as the support shaft for the tension arm and the straw holder as the support member for the fixed-side tension pulley. Further, for example, as compared with a case where both tension pulleys are made to swing, a mechanism (for example, a tension spring or the like) for applying a swing urging force can be simplified.

Further, in the present invention, the first and second substrates,

preferably, the fixed-side tension pulley is in contact with an upper-side path portion in the transmission belt from below,

The swing-side tension pulley is in contact with an upper side path portion in the belt from above.

Here, if the fixed-side tension pulley contacts the upper path portion of the belt from above and the oscillating-side tension pulley contacts the upper path portion of the belt from below, there is a possibility that the belt is separated from the fixed-side tension pulley by its own weight or the oscillating-side tension pulley is separated from the belt by its own weight. According to this feature, the belt is wound around the fixed-side tension pulley by its own weight, and the swing-side tension pulley is brought into contact with the belt by its own weight. This can effectively apply tension to the transmission belt.

Further, the fixed-side tension pulley is located closer to the straw holder than the fixed-side tension pulley is in contact with the lower path portion of the belt, and a structure in which the fixed-side tension pulley is supported by the straw holder can be advantageously configured.

Further, in the present invention, the first and second substrates,

preferably, the swing-side tension pulley acts on a portion of the transmission belt that spans the fixed-side tension pulley and the drive pulley.

According to this characteristic configuration, since the swing-side tension pulley acts on a portion of the transmission belt close to the drive pulley, the transmission belt can be stably wound around the drive pulley in order to improve the power transmission efficiency.

Further, in the present invention, the first and second substrates,

preferably, the fixed-side tension pulley acts on a portion of the transmission belt between the drive pulley and the driven pulley, the portion being closer to the drive pulley side.

According to this characteristic configuration, since the length of the portion of the belt that spans the fixed-side tension pulley and the drive pulley is short, the swing-side tension pulley can effectively apply tension to the belt.

Further, in the present invention, it is preferable that:

a support shaft swingably supported by the straw frame;

an arm swingably supported by the support shaft and provided across the straw rack and the support shaft;

an air damper for swinging the straw rack upward;

the end of the air damper on the straw holder side is coupled to the end of the arm on the straw holder side.

According to this characteristic structure, since the straw rack is supported by the arm and the air damper, the straw rack can be stably supported as compared with a case where the straw rack is supported only by the air damper.

Further, in the present invention, the first and second substrates,

preferably, the air damper and the arm are disposed above a lower end of a cylinder portion in the threshing cylinder.

According to this characteristic structure, the grain straw conveyed to the lower side of the barrel portion can be prevented from being obstructed by the air damper and the arm.

Further, in the present invention, it is preferable that,

a threshing cylinder frame which supports the threshing cylinder and can swing up and down around a swing axis extending along the front and back directions of the machine body;

the swing axis of the straw frame, the swing axis of the arm and the swing axis of the threshing frame are the same.

According to this characteristic structure, the straw frame, the arm, and the threshing cylinder frame can be easily associated with each swing structure (for example, the support shaft can be shared or integrally swung).

Drawings

Fig. 1 is a left side view showing a half-feed combine.

Fig. 2 is a plan view showing a half-feed combine.

Fig. 3 is a left side view showing the threshing device.

Fig. 4 is a rear view of the threshing device showing a state in which the threshing cylinder frame is lowered.

Fig. 5 is a rear view of the threshing device showing a state in which the threshing cylinder frame is lifted.

Fig. 6 is a plan view showing the rear part of the threshing device and the straw conveying device.

Fig. 7 is a left side view of the rear portion of the threshing device and the straw conveyor showing a state in which the threshing cylinder frame and the straw frame are lowered.

Fig. 8 is a rear view of the threshing device showing a state in which the threshing cylinder frame and the straw frame are lowered.

Fig. 9 is a rear view of the threshing device showing a state in which the threshing cylinder frame is lifted in a state in which the straw frame is located at a lowered position.

FIG. 10 is a rear view of the straw conveying apparatus showing the state in which the straw rack is in the lowered position.

FIG. 11 is a rear view of the straw conveyer for lifting the straw rack.

FIG. 12 is an exploded perspective view showing the structure of the base end side of the straw holder.

FIG. 13 is a left side view showing the structure of the base end side of the straw holder.

Fig. 14 is an exploded perspective view showing a threshing cylinder frame, a straw frame, and a rear frame.

Fig. 15 is a rear cross-sectional view of the first outer lock mechanism and the second outer lock mechanism showing the engaged state.

Fig. 16 is a rear cross-sectional view of the first outer lock mechanism and the second outer lock mechanism showing the engagement released state.

Fig. 17 is a rear cross-sectional view of the third outer lock mechanism showing the engagement released state.

Fig. 18 is a right side view of the third outer lock mechanism showing the engagement released state.

Fig. 19 is a left side view of the rear portion of the threshing device and the straw conveying device showing a state in which the threshing cylinder frame is lifted in a state in which the straw frame is at a lowered position.

Fig. 20 is a left side view of the rear portion of the threshing device and the straw conveyor showing a state in which the straw rack is lifted in a state in which the threshing cylinder rack is lifted.

Fig. 21 is a perspective view showing the switching plate.

Fig. 22 is a sectional view showing the lid member.

FIG. 23 is a rear view showing a structure for supporting the straw rack so as to be swingable up and down in another embodiment.

Fig. 24 is a perspective view showing a switching plate according to another embodiment.

Fig. 25 is a plan view showing a lid member according to another embodiment.

Fig. 26 is a sectional view showing a lid member according to another embodiment.

Description of the reference numerals

9 feeding chain

10 threshing device

11 threshing cylinder

12 straw conveying device

44 threshing cylinder frame

55 straw rack

Y2 swing axle center

Rising angle of alpha threshing cylinder frame

Rising angle of beta straw frame

40L left front and back orientation rack (side rack)

41 rear frame (side frame)

102 second outside locking mechanism (locking mechanism)

115 third outside locking mechanism (locking mechanism)

116 third outside hook (hook)

117 third outside hook pin (shaft component)

118 stay (supporting parts)

119 joystick

11b barrel part

12 straw conveying device

38 drive shaft

58 belt transmission mechanism

59 drive pulley

60 driven pulley

61 Transmission belt

62 tensioning arm

63 swing side tension pulley

64 fixed side tension pulley

76 support shaft

77 air damper

126 arm

Detailed Description

[ integral Structure of combine harvester ]

A semi-feeding combine is shown in fig. 1 and 2. The combine harvester comprises a machine frame 1 and a running device 2 for supporting the machine frame 1. On the right side of the front of the machine body, a cockpit 3 is provided. The cab 3 includes a cab 4 on which a driver rides, and a cabin 5 covering the cab 4. An engine (not shown) is provided below driver unit 4.

A harvesting unit 6 for harvesting crops in a field is provided in front of the cockpit 3. A grain storage box 7 for storing grains is arranged behind the cockpit 3. A grain discharging device 8 for discharging grains in the grain storage tank 7 is provided. The left side of the machine body is provided with a feeding chain 9 for clamping and conveying the cut straws. A threshing device 10 is arranged at the left adjacent to the grain storage box 7. The threshing device 10 threshes the cut grain stalks conveyed by the feed chain 9 through a threshing cylinder 11. A straw conveying device 12 is connected and arranged at the rear side of the threshing device 10. The straw conveying device 12 collects the threshed straws from the feeding chain 9 and clamps and conveys the straws to the back.

[ reaping part ]

The harvesting unit 6 is configured to have a plurality of cutter sizes (for example, six cutter sizes). The harvesting section 6 includes a plurality of (e.g., seven) dividing implements 13, a plurality of (e.g., six) grain lifting devices 14, a cutting device 15, and a conveying device 16. The seedling dividing appliance 13 divides the crops in the field. The grain lifting device 14 lifts the grain of the divided crops. The cutting device 15 cuts the crop lifted by the grain lifter. The conveyor 16 conveys the harvested crop backward toward the threshing device 10.

[ threshing device, etc. ]

As shown in fig. 3, a threshing chamber 17 is formed in an upper portion of the threshing device 10. The threshing chamber 17 is provided with a threshing cylinder 11. The threshing cylinder 11 is rotatable about a rotation axis Y1 extending in the front-rear direction of the machine body. A screen 18 is provided below the threshing cylinder 11. A dust exhaust fan 19 for discharging dust to the outside is provided behind the threshing chamber 17.

The threshing device 10 is provided at the lower part thereof with a swing sifting device 20 for sifting the objects to be sifted while conveying them to the rear of the machine body, a cleaning fan 21 for blowing cleaning air to the swing sifting device 20, a primary processing and recovering part 22 for recovering grains (e.g., grains having branches) of the primary processed objects, a secondary processing and recovering part 23 for recovering grains (e.g., grains having branches) of the secondary processed objects, and the like.

The primary treatment recovery section 22 is provided with a primary auger 24 for transporting grains of the primary treatment product to the right. A vertical grain feeding device 25 for feeding grains of the primary processed matter to the grain storage tank 7 is linked to the right end of the primary screw 24.

The secondary treatment recovery unit 23 is provided with a secondary auger 26 for transporting grains of the secondary treatment product to the right. A secondary treatment reduction device 27 for reducing the grains of the secondary treatment object to the swing screening device 20 is linked and connected to the right end of the secondary auger 26.

A straw cutting device 28 for cutting the straw conveyed by the straw conveying device 12 is provided below the conveying end side portion of the straw conveying device 12. The straw cutting device 28 is swingable about a swing axis Z1 extending vertically on the right end side thereof to a working position below the conveyance end side of the straw conveyor 12 and a non-working position below the conveyance end side of the straw conveyor 12 (see fig. 2). The straw cutting device 28 includes a cutting tool 29 for cutting straw, a cover 30 for covering the cutting tool, and a switching plate 31. A feeding port 30a into which straw is fed is formed in a portion of the cover 30 located above the cutting tool 29. A lateral frame 32 extending in the left-right direction of the machine body is provided across the left and right side walls of the cover 30.

The switching plate 31 is switchable between a blocking position for opening the inlet 30a and a non-blocking position for closing the inlet 30 a. The switching plate 31 is swingably opened and closed over a cutting position on the ascending side and a non-cutting position on the descending side around a swing axis extending in the left-right direction of the machine body. The switch plate 31 is swingably supported to the cover 30 via a support shaft 33. In a state where the switching plate 31 is opened (a state of the cutting position), the straw conveyed by the straw conveying device 12 is fed into the inlet 30a and cut by the cutting tool 29. In a state where the switch plate 31 is closed (a state of the non-cutting position), the straw conveyed by the straw conveying device 12 slides over the upper surface of the switch plate 31 and falls to the ground.

As shown in fig. 3 to 7, wall portions 34 are provided at the front end and the rear end of the threshing chamber 17, respectively. The front wall portion 34 constitutes a front wall portion of the threshing chamber 17. The rear wall portion 34 constitutes a rear wall portion of the threshing chamber 17. The wall portion 34 includes a movable wall 35 and a fixed wall 36. The threshing cylinder 11 is rotatably supported by the movable wall 35 via a threshing cylinder shaft 11 a. A connecting arm 37 for connecting the movable wall 35 and the fixed wall 36 is provided across them. The movable wall 35 is supported by the fixed wall 36 via the connecting arm 37 so as to be vertically swingable about a swing axis Y2 extending in the front-rear direction of the machine body. A transmission shaft 38 that transmits the power of the engine is provided across the front fixed wall 36 and the rear fixed wall 36.

The right side in the threshing device 10 is constituted by a right side wall 39. The right side wall 39 extends to the rear end of the body. The right side wall 39 includes an inclined portion 39 a. The inclined portion 39a is inclined rearward relative to the rear wall portion 34 so as to be positioned rightward toward the rear.

Front and rear direction frames 40L and 40R extending in the front and rear direction of the machine body are provided on the left and right sides of the threshing device 10. The left front-rear direction frame 40L (corresponding to the "side frame" in the present invention) extends rearward of the rear end of the threshing cylinder 11. The left front-rear direction frame 40L is formed of a square pipe having a substantially square cross-sectional shape. The right front-rear direction frame 40R extends rearward from the rear end of the threshing cylinder 11. The right front-rear facing frame 40R supports the front fixing wall 36, the rear fixing wall 36, and the right side portion 39. The right front-rear direction frame 40R is formed of a square tube having a substantially rectangular cross-sectional shape (a substantially rectangular shape that is horizontally long).

[ rear rack ]

A rear frame 41 (corresponding to a "side frame" in the present invention) is provided on the upper rear side of the threshing device 10 on the outer side of the machine body (left side) in the left-right direction of the machine body. The rear frame 41 is formed in a substantially U-shape protruding rearward from the rear of the threshing device 10 when viewed from the side. The rear frame 41 is formed of a circular tube.

[ threshing chamber cover ]

A threshing chamber cover 42 is provided to cover the threshing chamber 11 from above. The threshing chamber cover 42 extends rearward from the rear end of the threshing chamber 11 to above the rear portion of the straw conveyor 12. A right upper cover 43 is provided adjacent to the threshing chamber cover 42 on the right. The right upper cover 43 extends rearward from the rear end of the threshing chamber 11 to above the rear of the straw conveyor 12. The right upper cover 43 is supported by the right forward/backward facing frame 40R so as to be vertically swingable about a swing axis extending in the forward/backward direction of the machine body.

[ threshing cylinder rack ]

The threshing cylinder cover 42 is supported by a threshing cylinder frame 44. The threshing cylinder frame 44 is swingable up and down about the transmission shaft 38 extending in the front-rear direction of the machine body. The threshing cylinder frame 44 is supported by the front wall 34 and the rear wall 34 via the transmission shaft 38 so as to be vertically swingable about a swing axis Y2. The threshing cylinder frame 44 includes a pair of front and rear movable walls 35 and a left front and rear direction frame 40L. The left front-rear direction frame 40L is located outside the machine body in the left-right direction of the machine body in the threshing cylinder frame 44.

A hydraulic cylinder 45 for swinging the threshing cylinder frame 44 upward is provided. The hydraulic cylinder 45 is provided across the rear movable wall 35 and the rear fixed wall 36. The hydraulic cylinder 45 is constituted by a double-acting hydraulic cylinder, for example. However, the hydraulic cylinder 45 may be constituted by a single-acting hydraulic cylinder.

[ locking mechanism of threshing cylinder ]

The threshing cylinder 11 can be swung upward together with the threshing cylinder frame 44 by the hydraulic cylinder 45. A threshing cylinder locking mechanism 46 is provided for holding the position of the threshing cylinder 11 at a threshing position where threshing is performed. The threshing cylinder locking mechanism 46 includes a pair of front and rear hook plates 47 and a pair of front and rear threshing cylinder hook pins 48. The hook plate 47 is supported by the front wall 34 and the rear wall 34 so as to be pivotable about a pivot axis Y3 extending in the front-rear direction of the machine body. A hook 47a engageable with a threshing cylinder hook pin 48 is provided at the front end of the hook plate 47. The hook 47a is engaged with the threshing cylinder hooking pin 48, whereby the position of the threshing cylinder 11 is held at the threshing processing position. By releasing the engagement of the hook 47a with the threshing cylinder hook pin 48, the threshing cylinder 11 is swung upward together with the threshing cylinder frame 44 by the hydraulic cylinder 45. A motor M for swinging and driving the pair of front and rear hook plates 47 is supported on the rear surface of the rear wall portion 34. The front and rear pair of hook plates 47 are swung to the engagement side and the engagement release side by the motor M.

[ straw conveying device ]

As shown in fig. 6 and 7, the straw conveying device 12 is disposed in a state of being inclined so as to be positioned on one side (right side) in the left-right direction of the machine body toward the conveying end side of the straw conveying device 12 in a plan view. The straw conveying device 12 includes a stem root conveying device 49 for pinching and conveying the stem root side of the straw and an ear tip conveying device 50 for catching and conveying the ear tip side of the straw. The stalk root conveyor 49 includes a stalk chain 51 having a protrusion 51a and a stalk guide 52. The straw guide 52 is disposed below the straw chain 51 so as to face the lower path of the straw chain 51. A pair of guide plates 53 for guiding the straw chain 51 are provided at the conveying end portion of the stalk root conveying device 49. The ear tip conveyor 50 includes a straw ear tip chain 54 having elastic teeth 54 a.

The straw conveying device 12 is supported on a straw rack 55. The straw conveying device 12 is detachable from the straw rack 55. The straw conveying device 12 is suspended and supported by the straw rack 55 via a front stay 56 and a rear stay 57. The straw conveying device 12 is detachably bolted to the front stays 56. The straw conveying device 12 is detachably bolted to the rear stay 57.

The straw conveying space S of the straw conveying device 12 is formed behind the wall part 34 on the rear side. The straw conveying space S is formed in a manner to straddle the straw rack 55 in the front-rear direction of the body. The straw conveying space S is enlarged so as to be located on the right side toward the downstream side in the conveying direction at a front and rear middle portion (a portion corresponding to the front end of the inclined portion 39 a) of the straw conveying space S in plan view.

[ Belt drive mechanism ]

As shown in fig. 6, 8 and 9, a belt transmission mechanism 58 for transmitting the power of the transmission shaft 38 to an input shaft (not shown) of the straw conveyor 12 is provided so as to straddle the transmission shaft 38 and the input shaft of the straw conveyor 12. The belt transmission mechanism 58 includes a drive pulley 59, a driven pulley 60, a transmission belt 61, a tension arm 62, a swing-side tension pulley 63, and a fixed-side tension pulley 64. The drive pulley 59 is provided at a portion of the transmission shaft 38 projecting rearward from the rear fixed wall 36. The driven pulley 60 is arranged on the input shaft of the straw conveying device 12. The transmission belt 61 is wound around the drive pulley 59 and the driven pulley 60.

The tension arm 62 is swingably supported to the transmission shaft 38. The swing-side tension pulley 63 is rotatably supported by the tip end portion of the tension arm 62. The swinging-side tension pulley 63 is in contact with the upper path portion of the belt 61 from above in order to apply tension to the belt 61. The swinging-side tension pulley 63 acts on a portion of the transmission belt 61 that spans the fixed-side tension pulley 64 and the drive pulley 59. The tension arm 62 is provided with a mounting portion 66 to which the tension spring 65 is mounted.

The fixed-side tension pulley 64 is in contact with the upper path portion of the belt 61 from below in order to apply tension to the belt 61. The fixed-side tension pulley 64 acts on a portion of the transmission wheel 61 between the drive pulley 59 and the driven pulley 60 on the side closer to the drive pulley 59. The fixed-side tension pulley 64 is supported by the straw holder 55 via a support plate 67. The support plate 67 is provided in a state of hanging down from a front edge portion (front frame 72) of the straw rack 55. A support shaft 68 that supports the fixed-side tension pulley 64 protrudes forward from the support plate 67.

The tension spring 65 biases the tension arm 62 to swing in the tension applying direction around the swing shaft center Y2. The end of the tension spring 65 opposite to the mounting portion 66 is mounted to the rod 69. The rod 69 is supported by a stay 70 so as to be adjustable in position. The stay 70 is fixed to the support plate 67. The force of the tensioning spring 65 is varied by the positional adjustment of the rod 69 relative to the stay 70.

[ straw rack ]

As shown in fig. 6 to 11, the straw holder 55 supports the front and rear portions of the straw conveyor 12 via the front stay 56 and the rear stay 57. The straw frame 55 is formed in a frame shape. The straw rack 55 includes a base end frame 71, a front frame 72, a rear frame 73, and a free end frame 74. A circular tube is bent to form a front frame 72, a rear frame 73, and a free end frame 74. The front of the straw conveying device 12 is supported by the free end frame 74 via the front stay 56. The rear portion of the straw conveying device 12 is supported by a proximal end portion of the rear frame 73 via a rear stay 57. A coupling frame 75 for coupling the front frame 72 and the rear frame 73 is provided across a substantially central portion in the longitudinal direction thereof. The connecting frame 75 is formed of a member having a substantially L-shaped cross section.

The straw rack 55 is vertically swingable about a swing axis Y2 at a lowering position where straw is conveyed through the straw conveyor 12 and at a raising position where the straw conveyor 12 does not convey straw. The straw frame 55 is swingable up and down about a support shaft 76 extending in the front-rear direction of the machine body. An air damper 77 for swinging the straw rack 55 upward is provided. Air dampers 77 are provided across the straw rack 55 (front rack 72) and the lower braces 78. An upper stay 79 to which the air damper 77 is connected is fixed to the front frame 72.

As shown in fig. 12 to 14, the base end frame 71 is provided on the base end side of the straw frame 55 and extends in the front-rear direction of the machine body. The base end frame 71 includes a front side frame portion 80 constituting the front side, a rear side frame portion 81 constituting the rear side, and a connecting frame portion 82 spanning the front side frame portion 80 and the rear side frame portion 81. The front portion of the base end frame 71 (the front side frame portion 80) is supported by the support shaft 76 via a stay 83.

A stepped portion 71a recessed downward is formed in the base end frame 71 at a position corresponding to the coupling frame portion 82. The coupling frame portion 82 includes a groove plate 84 and a coupling plate 85 that are open downward. The groove plate 84 is provided across the lower surface of the front side frame portion 80 and the lower surface of the rear side frame portion 81. Inside the gutter-shaped plate 84, a coupling plate 85 coupling the left and right side walls of the gutter-shaped plate 84 is provided across them.

The front frame 72 is coupled to the front end portion of the base end frame 71 and extends from the support shaft 76 side toward the outside of the body in the left-right direction of the body. The rear frame 73 is coupled to the rear end portion of the base end frame 71 and extends from the support shaft 76 side toward the outside of the body in the left-right direction of the body.

The free end frame 74 is provided on the free end side of the straw frame 55 and extends in the front-rear direction of the machine body. The free end frame 74 is coupled to an end portion of the front frame 72 on the outside of the machine body in the left-right direction and an end portion of the rear frame 73 on the outside of the machine body in the left-right direction. With the straw rack 55 in the lowered position, the free end frame 74 is positioned to the right of the left front-to-back facing frame 40L and extends along the left front-to-back facing frame 40L.

The support shaft 76 is a shaft different from the transmission shaft 38, and is supported by the forward/rearward facing frame 40R on the right side supporting the transmission shaft 38. The transmission shaft 38 and the support shaft 76 are disposed on the same axis (swing axis Y2). That is, the swing axis Y2 of the straw frame 55 and the swing axis Y2 of the threshing cylinder frame 44 are the same. The support shaft 76 is disposed forward of the middle portion of the straw conveying space S (the portion corresponding to the front end of the inclined portion 39 a). The right front-rear direction frame 40R extends rearward relative to the support shaft 76. The support shaft 76 is supported by the bracket 87 via the lower stay 78 and the stay 86. The bracket 87 is provided to hang down on the lower surface of the right front-rear facing frame 40R. The lower stay 78 is bolted to the bracket 87. The stay 86 is bolted to the bracket 87.

A handle 88 for lifting the straw rack 55 is arranged at the rear part of the straw rack 55. The handle 88 extends from the base end side of the straw holder 55 toward the outside of the machine body in the left-right direction of the machine body.

[ stopper ]

A stopper 89 for holding the straw rack 55 in a raised state is provided. The stopper 89 is swingably and slidably supported by the stay 90. A stopper 89 is provided at its proximal end with a stopper 91 that prevents the stopper 89 from coming off the stay 90. Brace 90 is secured to the rear of free end frame 74. A holding portion 92 for holding the stopper 89 at the storage position is provided at the front portion of the free end frame 74. A hole 41a into which the front end of the stopper 89 is inserted is formed in the rear frame 41.

[ inner side locking mechanism ]

As shown in fig. 10 to 14, an inner lock mechanism 93 is provided for holding the base end side portion (base end frame 71) of the straw holder 55 at a right front-rear direction frame 40R position in a state where the straw holder 55 is at the lowered position. The inner lock mechanism 93 includes an inner hook 94 and an inner hook pin 95.

The inner hook 94 is locked to an inner hook pin 95 (see fig. 10) following the swing of the straw rack 55 toward the lowered position. Then, the engagement of the inner hook 94 with the inner hook pin 95 is released following the swing of the straw holder 55 toward the raised position (see fig. 11).

[ first outside locking mechanism ]

As shown in fig. 14 to 16, a first outer lock mechanism 96 is provided to hold the left front-rear direction frame 40L at the position of the rear frame 41 in a state where the threshing cylinder frame 44 is at the lowered position. The first outer lock mechanism 96 includes a first outer hook 97 and a first outer hook pin 98. The first outer hook 97 includes a base portion 97a and a hook portion 97 b. The hook portion 97b is detachably fixed to the base portion 97a by a bolt 99.

The first outside hook pin 98 is disposed at a position slightly distant from the rear frame 41 at the left vicinity of the rear frame 41. First outer hook pin 98 is supported by rear frame 41 via first stay 100 and second stay 101.

[ second outside locking mechanism ]

A second outside locking mechanism 102 (corresponding to a "locking mechanism" in the present invention) is provided to hold the free end side portion of the straw holder 55 at a position of the left front-rear direction holder 40L in a state where the straw holder 55 is at the lowered position. In other words, the second outside locking mechanism 102 holds the left front-rear direction frame 40L at the position of the free end side portion of the straw frame 55 in the state where the threshing cylinder frame 44 is at the lowered position. The second outside locking mechanism 102 is provided in the front portion of the free end side portion of the straw holder 55. The second outside locking mechanism 102 includes a second outside hook 103 and a second outside hook pin 104. The second outer hook 103 includes a base portion 103a and a hook portion 103 b. The hook 103b is detachably fixed to the base 103a by a bolt 105.

The lower surfaces of the corners of the free end frame 74 and the front frame 72 of the straw frame 55 are provided with flat plate-like mounting portions 106. The stay 107 is bolted to the mounting portion 106. The second outer hook pin 104 is supported by a stay 107 in a state of being positioned at the lower left of the free end frame 74.

A pair of front and rear support members 108 for supporting the second outer hook pin 104 are provided on the lower surface of the left front and rear facing frame 40L. In a state where the front end portion of the second outer hook pin 104 is supported by the front support member 108 and the rear end portion of the second outer hook pin 104 is supported by the rear support member 108, the second outer hook 103 engages with the front-rear center portion of the second outer hook pin 104.

[ Link mechanism ]

As shown in fig. 6 to 9, a link mechanism 109 is provided to interlock and connect the threshing cylinder locking mechanism 46 (the rear hook plate 47), the first outside locking mechanism 96 (the first outside hook 97), and the second outside locking mechanism 102 (the second outside hook 103). The link mechanism 109 includes a first link arm 110, a second link arm 111, and a link 112. The first link arm 110 is connected to a base end portion of the rear hook plate 47 so as to be relatively swingable. The first link arm 110 and the second link arm 111 are coupled to be relatively swingable.

The link 112 is supported by the left forward/rearward facing frame 40L via a front stay 113 and a rear stay 114. The link 112 is rotatably supported by a front stay 113 and a rear stay 114. The second link arm 111 is connected to the tip end of the link 112 so as not to be relatively swingable. The second outside hook 103 is connected to the front portion of the link 112 so as not to be relatively swingable. The first outer hook 97 is connected to the rear end of the link 112 so as not to be relatively swingable.

[ third outside locking mechanism ]

As shown in fig. 14, 17 and 18, a third outside locking mechanism 115 (corresponding to a "locking mechanism" in the present invention) is provided to hold the free end side portion of the straw holder 55 at the position of the rear holder 41 in a state where the straw holder 55 is at the lowered position. The third outside locking mechanism 115 is provided in the rear of the free end side portion of the straw holder 55. The third outer lock mechanism 115 includes a third outer hook 116, a third outer hook pin 117 (corresponding to the "shaft member" in the present invention), a stay 118 (corresponding to the "support member" in the present invention), a lever 119, and a spring 120.

The third outer hook 116 is engaged with the third outer hook pin 117 in a state where the third outer hook pin 117 is supported by the support portion 118a of the stay 118. Third outer hook 116 is supported on rear frame 41 via stay 118 in a state of being positioned on the right side with respect to rear frame 41. The third outer hook 116 is swingably supported by a stay 118 via a support shaft 121. The operating lever 119 is coupled to the third outer hook 116. The lever 119 is manually switched between an engagement position where the third outer hook 116 is engaged with the third outer hook pin 117 and a non-engagement position where the third outer hook is not engaged with the third outer hook pin 117.

The third outside locking mechanism 115 is positioned in the frame of the straw holder 55 in a state where the free end side portion of the straw holder 55 is held at the position of the rear holder 41. The third outside locking mechanism 115 does not protrude further downward than the lower end of the rear frame 41. Specifically, in a state where the third outer lock mechanism 115 holds the free end side portion of the straw holder 55 at the position of the rear holder 41, the third outer hook 116 and the operating lever 119 do not protrude further downward than the lower end of the rear holder 41.

The third outside hook pin 117 is provided on the straw rack 55. The third outer hook pin 117 is supported by the free end frame 74 via the stay 122 in a state of being positioned in the frame of the straw frame 55. Third outer hook pin 117 is detachably fixed to stay 122 by bolt 123.

Stay 118 is fixed to rear frame 41 in a state of being positioned right adjacent to rear frame 41. A support portion 118a is formed on the stay 118, and the support portion 118a supports the third outer hook pin 117 in a state where the straw holder 55 is located at the lowered position.

A spring 120 is disposed across brace 118 and third outer hook 116. The spring 120 biases the third outer hook 116 to swing toward the engagement side.

[ lifting action of threshing cylinder frame and straw frame ]

As shown in fig. 8 and 9, when the worker performs the raising operation by the raising/lowering operation unit (not shown), the pair of front and rear hook plates 47 are swung to the engagement releasing side by the motor M. Thereby, the hook plate 47 (hook 47a) is disengaged from the threshing cylinder hook pin 48. The swing of the rear hook plate 47 to the engagement release side is transmitted to the first outer hook 97 and the second outer hook 103 via the link mechanism 109. Thereby, the first outer hook 97 and the second outer hook 103 swing to the engagement release side in conjunction with the swing of the rear hook plate 47 to the engagement release side. Thus, the first outer hook 97 and the second outer hook 103 are in the engagement released state.

As shown in fig. 9 and 19, when the first outer lock mechanism 96 and the second outer lock mechanism 102 are in the disengaged state, the threshing cylinder frame 44 is swung upward by the extending operation of the hydraulic cylinder 45. That is, the threshing cylinder frame 44 can be raised in a state where the straw frame 55 is at the lowered position (the position where the straw conveying device 12 conveys the straw).

When the operator manually operates the lever 119 to switch the third outer hook 116 from the engagement position to the non-engagement position in a state where the threshing cylinder frame 44 is lifted, the straw frame 55 is swung upward by the air damper 77 as shown in fig. 11 and 20. That is, the straw frame 55 can be lifted in a state where the threshing cylinder frame 44 is lifted.

When the stopper 89 is detached from the holding portion 92 and swung downward in a state where the straw holder 55 is lifted, and the tip end portion of the stopper 89 is inserted into the hole 41a, the stopper 89 functions as a support rod between the straw holder 55 and the rear holder 41. This allows the straw rack 55 to be held in position while being lifted.

Next, when the worker performs a lowering operation by the raising and lowering operation unit in a state where the threshing cylinder frame 44 and the straw frame 55 are raised, the threshing cylinder frame 44 swings downward by the shortening operation of the hydraulic cylinder 45. When the threshing cylinder frame 44 is lowered to a position where the straw frame 55 is in contact with the straw frame 55 from above, the straw frame 55 is pressed from above by the threshing cylinder frame 44 as the threshing cylinder frame 44 is lowered, and the straw frame 55 and the threshing cylinder frame 44 are lowered together. This enables the straw rack 55 and the threshing cylinder rack 44 to be lowered integrally.

On the other hand, in a state where the threshing cylinder 44 and the straw rack 55 are lifted, the operator can lower the straw rack 55 independently from the threshing cylinder 44 by pressing down the straw rack 55 with the handle 88. That is, in a state where the threshing cylinder frame 44 and the straw frame 55 are lifted, it is possible to select to lower the straw frame 55 integrally with the threshing cylinder frame 44 or lower the straw frame 55 independently from the threshing cylinder frame 44.

When the third outer hook pin 117 comes into contact with the inclined portion 116a of the third outer hook 116 from above with respect to the third outer hook 116 in accordance with the lowering operation of the straw holder 55, the third outer hook 116 swings toward the engagement releasing side against the urging force of the spring 120. The third outer hook 116 is swung to the engaging side by the urging force of the spring in a state where the third outer hook pin 117 is supported by the support portion 118a of the stay 118, and is engaged with the third outer hook pin 117. Thus, the third outside lock mechanism 115 is in the engaged state.

In a state where the threshing cylinder frame 44 and the straw frame 55 are lowered, the pair of front and rear hook plates 47 are swung to the engaging side by the motor M. Thereby, the hook plate 47 (hook 47a) is engaged with the threshing cylinder hook pin 48. The swing of the rear hook plate 47 to the engagement side is transmitted to the first outer hook 97 and the second outer hook 103 via the link mechanism 109. Thereby, the first outer hook 97 and the second outer hook 103 are swung to the engagement side in conjunction with the swing of the rear hook plate 47 to the engagement side. Thus, the first outer hook 97 and the second outer hook 103 are engaged.

Here, the rising angle β of the straw frame 55 (see fig. 11) is smaller than the rising angle α of the threshing cylinder frame 44 (see fig. 5). Specifically, the rising angle β of the straw holder 55 is set so that the cross frame 32 does not interfere with the conveyance end side portion (guide plate 53) of the straw conveyance device 12 when the straw cutting device 28 swings over the working position and the non-working position in the state where the straw holder 55 is rising. In detail, in fig. 20, a movement locus of the upper end of the cross frame 32 when the straw cutting apparatus 28 swings to the working position and the non-working position is represented by T. The lower end 53a of the guide plate 53 is located above the movement locus T of the upper end of the cross frame 32. This can avoid a situation in which the transverse frame 32 interferes with the guide plate 53 and hinders the swing of the straw cutting device 28 when the straw cutting device 28 swings over the working position and the non-working position while the straw holder 55 is lifted.

[ switching plate ]

As shown in fig. 20 to 22, the switching plate 31 is formed with a notch 31a so as not to interfere with the conveyance end side portion (guide plate 53) of the straw conveyance device 12 when the switching plate 31 is switched between the cutting position and the non-cutting position in a state where the straw rack 55 is lifted. The cutout 31a is formed in the right portion of the switching plate 31. The notch 31a opens on the opposite side of the support shaft 33.

A cover member 124 is provided to cover the notch 31 a. The cover member 124 allows the guide plate 53 to enter the cutout portion 31 a. The peripheral edge of the cover member 124 is fixed to the peripheral edge of the cutout 31a in the switching plate 31 by bolts 125. The cover member 124 is formed of an elastically deformable member. In the present embodiment, the cover member 124 is made of, for example, a rubber-like elastic material (polyurethane elastic material). A slit 124a into which the guide plate 53 enters is formed in the cover member 124. The slit 124a extends in a direction orthogonal to the support shaft 33 (the short-side direction of the switch plate 31). Both edge portions of the cover member 124 on the slit 124a side are bent so as to be lower toward the slit 124a side. Therefore, in a state where the switch plate 31 is closed (a state of the non-cutting position), the straw sliding on the upper surface of the switch plate 31 is less likely to be caught by the slit 124 a.

Here, as shown in fig. 20, the position of the guide plate 53 is lowered as the straw holder 55 swings upward. In the present embodiment, when the switching plate 31 is switched between the cutting position and the non-cutting position in a state where the straw holder 55 is lifted, the guide plate 53 enters the notch portion 31a through the slit 124 a. At this time, when the guide plate 53 comes into contact with the cover member 124, the cover member 24 is elastically deformed to allow the guide plate 53 to enter the cutout portion 31 a. Thereafter, when the guide plate 53 is separated from the cover member 124, the cover member 124 returns to its original shape.

[ other embodiments ]

(1) The straw rack 55 may be configured to be able to be raised to a position on the raising side of the position corresponding to the raising angle β. This will be described with reference to fig. 23.

As shown in FIG. 23, an arm 126 is provided spanning the straw rack 55 and the support shaft 76. The arm 126 is swingably supported by the support shaft 76. That is, the swing axis Y2 of the straw frame 55, the swing axis Y2 of the arm 126, and the swing axis Y2 of the threshing cylinder frame 44 are the same.

At an end (front end) of the arm 126 on the straw holder 55 side, the straw holder 55 (front holder 72) is mounted so as to be separable from the arm 126 from above. The end (tip end) of the air damper 77 on the straw rack 55 side is coupled to the tip end of the arm 126. The air damper 77 and the arm 126 are disposed above the lower end of the cylinder portion 11b in the threshing cylinder 11 (specifically, above the threshing cylinder shaft 11 a).

According to such a configuration, when the operator lifts the straw holder 55 by using the handle 88 in a state where the straw holder 55 is lifted up to a position corresponding to the lift angle β (a position corresponding to the maximum extension length of the air damper 77), the straw holder 55 is separated from the arm 126 from above, and the straw holder 55 is lifted up to a position on the lift side of the position corresponding to the lift angle β. In this case, the rising angle when the straw holder 55 rises to a position on the rising side of the position corresponding to the rising angle β is set to be equal to or smaller than the rising limit angle (rising angle α) of the threshing cylinder 44 (here, the same as the rising limit angle (rising angle α) of the threshing cylinder 44). When the straw rack 55 is attempted to be raised beyond the raising angle α of the threshing cylinder 44, the straw rack 55 is brought into contact with the threshing cylinder 44 from below, and the raising of the straw rack 55 is prevented by the threshing cylinder 44.

In addition, in a configuration in which the straw holder 55 can be raised to a position on the raising side of the position corresponding to the raising angle β, a coupling mechanism (not shown) that couples and decouples the straw holder 55 and the threshing cylinder holder 44 (for example, couples and decouples the free end frame 74 and the left front-rear direction frame 40L) may be provided. The straw frame 55 and the threshing cylinder frame 44 can be integrally lifted by the hydraulic cylinder 45 in a state where the free end frame 74 and the left front-rear direction frame 40L are connected by the connection mechanism.

(2) Instead of the lid member 124 of the above embodiment, a lid member 224 shown in fig. 24 to 26 may be provided. The cover member 224 is swingably supported to the switch plate 31 via a pair of hinges 127. The hinge 127 is provided across the back surface of the cover member 224 and the back surface of the switch plate 31.

A leaf spring 128 is provided to hold the lid member 224 at a position covering the notch portion 31 a. The leaf spring 128 is provided across the back surface of the cover member 224 and the back surface of the switching plate 31. A stay 129 that slidably supports the plate spring 128 is provided on the back side of the switching plate 31.

According to such a structure, when the guide plate 53 contacts the cover member 224 from the back side, the cover member 224 swings via the pair of hinges 127 to allow the guide plate 53 to enter the cutout portion 31 a. Thereafter, when the guide plate 53 is separated from the cover member 224, the cover member 224 is restored to the position covering the cutout portion 31a by the spring force of the leaf spring 128 and held at the position.

(3) In the above embodiment, the lowered position of the straw rack 55 is a position where the straw conveying device 12 conveys straw. However, the lowered position of the straw rack 55 may be a position (slightly higher position) higher than the straw conveyance device 12.

(4) In the above embodiment, in a state where the threshing cylinder frame 44 and the straw frame 55 are lifted, it is possible to select to lower the straw frame 55 integrally with the threshing cylinder frame 44 or lower the straw frame 55 independently from the threshing cylinder frame 44. However, in a state where the threshing cylinder frame 44 and the straw frame 55 are lifted, only the straw frame 55 and the threshing cylinder frame 44 may be selectively lowered integrally, or only the straw frame 55 and the threshing cylinder frame 44 may be selectively lowered independently and separately.

(5) In the above embodiment, the straw cutting apparatus 28 is swingable about a swing axis Z1 extending vertically on the right end side over the working position and the non-working position. However, the straw cutting apparatus 28 may be configured to be swingable about a swing axis extending in the vertical direction on the left end side over the working position and the non-working position.

(6) In the above embodiment, the second outside locking mechanism 102 and the third outside locking mechanism 115 are provided, the second outside locking mechanism 102 holds the free end side portion of the straw rack 55 at the left front-rear direction rack 40L position in the state where the straw rack 55 is at the lowered position, and the third outside locking mechanism 115 holds the free end side portion of the straw rack 55 at the rear rack 41 position in the state where the straw rack 55 is at the lowered position. However, in addition to the second outer lock mechanism 102 and the third outer lock mechanism 115, one or more lock mechanisms may be provided to hold the free end side portion of the straw holder 55 at the left front-rear direction holder 40L or the rear holder 41 in a state where the straw holder 55 is at the lowered position.

(7) In the above embodiment, the second outside locking mechanism 102 is provided at the front portion among the free end side portions of the straw holder 55, and the third outside locking mechanism 115 is provided at the rear portion among the free end side portions of the straw holder 55. However, the positions where the second outside lock mechanism 102 and the third outside lock mechanism 115 are provided are not limited to the above-described positions. For example, the second outside locking mechanism 102 or the third outside locking mechanism 115 may be provided at the front-rear center portion of the free end side portion of the straw rack 55.

(8) In the above embodiment, the third outside locking mechanism 115 is located in the frame of the straw rack 55 in the engaged state. However, the second outside locking mechanism 102 may be positioned in the frame of the straw rack 55 in the engaged state instead of or together with the same.

(9) In the above embodiment, in the third outside lock mechanism 115, the third outside hook 116, the stay 118, and the lever 119 are provided on the rear frame 41, and the third outside hook pin 117 is provided on the straw frame 55. However, in the third outer lock mechanism 115, a third outer hook 116, a stay 118, and an operating lever 119 may be provided on the straw holder 55, and a third outer hook pin 117 may be provided on the rear holder 41.

(10) In the above embodiment, in the second outside locking mechanism 102, the second outside hook 103 and the pair of front and rear supporting members 108 are provided on the left front and rear facing frame 40L, and the second outside hook pin 104 is provided on the straw frame 55. However, in the second outside lock mechanism 102, the second outside hook 103 and the pair of front and rear support members 108 may be provided on the straw holder 55, and the second outside hook pin 104 may be provided on the left front and rear direction holder 40L.

(11) In the above embodiment, the third outer hook 116 is switched between the engagement position and the non-engagement position by the manual operation of the operating lever 119. However, the third outer hook 116 may be switched between the engagement position and the non-engagement position by an actuator (e.g., a motor).

(12) In the above embodiment, the second outer hook 103 is switched between the engagement position and the non-engagement position by the motor M. However, the second outer hook 103 may be switched between the engagement position and the non-engagement position by a manual operation (not shown) of a lever.

(13) In the above embodiment, the third outer lock mechanism 115 does not protrude further downward than the lower end of the rear frame 41. However, instead of or in addition to this, the second outside lock mechanism 102 may be configured not to protrude further downward than the lower end of the left front-rear direction frame 40L. Alternatively, the third outside lock mechanism 115 may be projected downward from the lower end of the rear frame 41.

(14) In the above embodiment, the fixed-side tension pulley 64 and the oscillating-side tension pulley 63 are in contact with the upper path portion of the belt 61. However, the fixed-side tension pulley 64 and the oscillating-side tension pulley 63 may contact the lower path portion of the belt 61.

(15) In the above embodiment, the swinging-side tension pulley 63 acts on a portion of the transmission belt 61 that spans the fixed-side tension pulley 64 and the drive pulley 59. However, the rocking-side tension pulley 63 may act on a portion of the belt 61 that spans the fixed-side tension pulley 64 and the driven pulley 60.

(16) In the above embodiment, the fixed-side tension pulley 64 acts on a portion of the transmission wheel 61 between the drive pulley 59 and the driven pulley 60 on the drive pulley 59 side. However, the fixed-side tension pulley 64 may act on a portion of the transmission wheel 61 on the driven pulley 60 side between the drive pulley 59 and the driven pulley 60. Alternatively, the fixed-side tension pulley 64 may act on a central portion of the transmission wheel 61 between the drive pulley 59 and the driven pulley 60.

(17) In the above embodiment, the swing axis Y2 of the straw rack 55 and the swing axis Y2 of the threshing cylinder rack 44 are the same. However, the swing axis of the straw frame 55 and the swing axis of the threshing cylinder frame 44 may be different.

[ Industrial Applicability ]

The present invention may be utilized with a combine (e.g., a semi-feed combine).

Claims

1. A combine harvester is characterized by comprising:

A feeding chain for clamping and conveying the cut grain stalks;

a threshing cylinder frame which supports the threshing cylinder and can swing up and down around a swing axis extending in the front-rear direction of the machine body;

when the straw frame is at the descending position, the threshing cylinder frame can be lifted.

2. A combine harvester according to claim 1, characterised in that the lowered position is a position in which the straw conveying means conveys straw.

3. A combine harvester according to claim 1 or 2, characterised in that the straw frame can be raised in a state in which the threshing cylinder frame is raised.

4. A combine harvester according to claim 3, characterised in that the rising angle of the straw frame is smaller than the rising angle of the threshing cylinder frame.

5. A combine harvester according to claim 3, wherein in a state where the threshing cylinder and the straw frame are raised, the straw frame can be selectively lowered integrally with the threshing cylinder or independently from the threshing cylinder.