JPH0583204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a threshing device such as a combine harvester or a threshing machine.

[Prior art]

The threshing device threshes the harvested grain culm with a handling cylinder.
Fine grains are extracted by sorting with a swing sorting device. The oscillating sorting device consists of a oscillating sorting board, a chaff sheave, a stroke rack, etc., and grains that have been sorted by specific gravity on the oscillating sorting board are further sorted by passing through the gaps between the fins of the chaff sheave.

Recently, a threshing device has been developed in which the inclination angle of the fins of the chaff sheave can be changed, and the inclination angle of the fins of the chaff sheave, that is, the gap between the fins, can be changed in accordance with the grain flow rate, thereby improving sorting accuracy. ing.

In such a threshing device, the throughput in the threshing section is not stable at the beginning of operation, which leads to inappropriate fin angle control, which has the disadvantage of reducing sorting accuracy.

〔the purpose〕

The present invention has been made in view of the above circumstances, and its purpose is to provide a threshing device that prevents a decrease in sorting accuracy at the start of threshing work.

〔composition〕

The present invention provides means for changing the angle of the fins in a chaff sheave, means for automatically adjusting the angle of the fins according to the throughput of the threshing section, means for instructing to perform the automatic adjustment, and means for engaging and disengaging the threshing clutch. A grain culm detection device comprising a detection means, a grain culm detection means, and a means for starting the automatic adjustment after waiting for a predetermined time to elapse when the automatic adjustment is instructed, the threshing clutch is engaged, and the grain culm is detected. It is.

〔Example〕

The present invention will be described below based on drawings showing embodiments thereof.

FIG. 1 is an external perspective view of a harvester equipped with a threshing device according to the present invention. In the figure, 3 is a threshing device mounted on the upper part of the machine body above the traveling crawler 1, and the reaping section K is located at the front part of the machine body and is composed of a dividing rod 4, a cutting blade 2, a pulling device 7, etc. The grain culms harvested by the threshing device 3 are sent to the threshing device 3 via upper and lower conveying devices (not shown), where they are threshed, and the threshed grains are sent to the paddy tank 5.

In the figure, 9 is an operation column installed in front of the driver's seat 8, and 10 is a vertical conveyance device, the end of which faces the starting end of the feed chain 12 of the grain culm transfer device 11. A grain culm sensor 6 is provided nearby to detect the feeding of grain culm to the threshing device. Note that the grain culm sensor 6 is not limited to this position, but may be placed on the side of the starting end of the grain culm transfer device 11, or within the conveyance path of the vertical conveyance device 10, etc., or in a harvester equipped with an automatic handling depth adjustment device. In the machine,
It may also be configured to be used in common with a sensor provided for culm length detection. The grain culm transfer device 11 is composed of a feed chain 12 and a ram 13, and is provided along the handling opening of the threshing device 3.

FIG. 2 is a partially cutaway vertical sectional view of the threshing device 3. The threshing device 3 has a handling barrel 17 having a large number of handling teeth 16, 16... mounted on a shaft in a handling chamber 15 formed in the upper part of the machine casing 14, and a handling opening parallel to the axial direction of the handling barrel 17. At the same time, a receiving net 18 is stretched in the lower part of the handling chamber 15, and furthermore, a swinging sorting device 1 is installed in the lower part of the handling chamber 15, which is substantially parallel to the axial length direction of the handling cylinder 17.
9. Furthermore, a processing chamber 50 for reprocessing the second reduction product is provided at the upper right side of the handling barrel 17 (near the center of the machine), and inside this processing chamber 50, the handling barrel extends in the axial direction. A processing cylinder 51 having a large number of handling teeth 52, 52, .

The swinging sorting device 19 includes a swinging sorting board 20 extending in an inclined manner, a chaff sheave 21 of a variable angle type (to be described later) provided at the lower rear of the swinging sorting board 20, and a straw connected to the rear of the chaff sheave 21. It is composed of a rack 22, etc., and the handling cylinder 17 is controlled by a swinging arm 23 that swings in conjunction with a drive source.
It is configured to swing in the longitudinal direction of the axis.

Further, below the swinging sorting device 19, there is a first grain board 2.
5 and the first grain take-out part (first mouth) 27 consisting of the first screw 26, and the second grain take-out part (second mouth) consisting of the second grain plate 28 and the second screw 29.
30 is formed.

The grains that have fallen into the first grain take-out section 27 are fed from the first screw 26 to the paddy tank 5, and the grains that have fallen into the second grain take-out section 30 are sent from the second screw 29 to the second throat tube by the blower 47. 48 and is blown up into the roof plate of the threshing device 3 and dropped onto the processing cylinder 51 from a processing cylinder cover 53 protruding above the processing chamber 50 for re-sorting. The second screw 29 is provided with a second rotation sensor 69 that detects the number of revolutions of the screw 29, and the processing cylinder cover 53 is provided with a second sensor 69 that detects the amount of second material returned to the processing cylinder.
is provided.

A grain sheave 32 is provided below the chaff sheave 21 in the air passage 31.
A winnowing device 33 is provided on the wind raising side. Then, the airflow from this Karakino device 33 flows through the rectifier plates 34, 35
After the air is rectified by the airflow path 31, the air is discharged to the outside of the aircraft from a dust exhaust port (third exit) 36 at the rear of the aircraft.

A dust suction/exhaust device 37 using an axial fan is provided at the rear and upper part of the stroke rack 22;
An upper suction cover 38 is placed above the dust suction/exhaust device 37.
In addition, a lower suction cover 39 is provided below, and the suction port 40 of the dust suction/exhaust device 37 is connected to the air path 3.
It is opened on the first side, and its air exhaust port 41 is opened toward the dust exhaust port 36.

Above the upper suction cover 38, a fourth gutter 43 is provided which extends diagonally upward from both ends to form a fourth gutter 44, which collects the prickly grains taken out from the culm after threshing, that is, from the waste straw. The stroke rack 22 is configured to be returned upward.

FIG. 3 is a side sectional view of the vicinity of the fin angle adjustment lever shown together with a part of the chaff sheave. The chaff sheave 21 is located between the left and right frame members (not shown) extending in the longitudinal direction of the aircraft among the rectangular frame members.
A large number of fins 21b extending in the left-right direction of the fuselage body are arranged in parallel in the front-rear direction, and each upper part is pivotally supported on a frame member. The lower part of each fin 21b is pivotally supported by one adjusting rod 21c extending in the front-rear direction, and the middle of the rotation shaft 21d is fixed to the front part of the adjusting rod 21c. The rotation shaft 21d is pivotally supported at a position above the adjustment link 21c, and the front end of the tension spring 21e is locked to the upper part of the rotation shaft 21d. Tension spring 21
The other end of e is locked in place within the threshing chamber. A push-pull wire 21f is attached to the lower end of the rotation shaft 21d.
One end of the push-pull wire 2 is locked, and the push-pull wire 2
The other end of 1f is pivotally supported by a rotating piece 72 attached to the base end of an operating lever 71 provided on the front side of the threshing device 3 on the side of the driver's seat 8.

Therefore, by pulling the push-pull wire 21f, the lower part of the rotation rod 21d is rotated rearward, and the adjustment rod 21c is moved rearward, and the fin 21b is erected and the fin angle (between the fin 21b and the adjustment rod 21c
γ becomes larger, and the gap between the fins 21b becomes larger. On the other hand, push-pull wire 2
When 1f is pressed, the lower part of the rotation rod 21d is rotated forward, the adjustment rod 21c is moved forward, the fins 21b are tilted, the fin angle γ becomes small, and the gap between the fins 21b becomes small.

The operating lever 71 is provided on the front right side of the threshing device 3 and can be operated by a worker seated in the driver's seat 8. On the front of the threshing device 3,
An operation panel 70 is attached to the rear surface of the operation panel 70, and a frame 77 which is open in plan view and has a U-shape in plan view is attached to the rear surface of the operation panel 70. An operation lever 71 is pivotally supported on the side surface of the frame 77. . The front part of the operating lever 71 passes through an elongated hole formed in the operating panel 70 and protrudes forward, and the lower part of a rectangular rotating piece 72 is fixed to the base end of the operating lever 71. One end of the push-pull wire 21f is locked.

The front part of the frame 77 has a rotating shaft 75 in the vertical direction.
is mounted on a shaft, and a spiral feeding member 76 is fixed to the rotating shaft 75 at both ends and at an appropriate portion in the middle. Further, a lower end portion of the rotating shaft 75 projects downward from the frame 77, and this projecting portion is inserted into the gear box 74. This gear box 74 is attached to a motor 73 with its output shaft at the front, and the driving force of the motor 73 is transmitted to a rotating shaft 75 by a worm gear to rotate a feeding member 76. The aforementioned operating lever 71 is pressed toward the rotating shaft 75 by an appropriate method (not shown), and is adapted to be engaged between the spirals of the feed member 76.

Therefore, when the motor 73 is driven and the feeding member 76 rotates, the operating lever 71 is sent into the spiral of the feeding member 76 and moves in the vertical direction. It is also possible to remove the lock and operate it manually. When the operating lever 71 is rotated manually or by reverse rotation (or forward rotation) of the motor 73 in the direction shown by the solid line (or broken line) in FIG. 3, the push-pull wire 2
If 1f is pulled (or pressed), the fins 21b stand up (or tilt), and the gap between the fins becomes larger (or smaller). A lever position detection sensor 78 using a potentiometer is provided at the base end pivot portion of the operating lever 71, and detects a voltage corresponding to the rotational position of the operating lever 71, and thus a voltage corresponding to the fin angle. It is output from the sensor 78.

FIG. 4 is a circuit diagram of the control system of the device of the present invention.
In the figure, 80 is a control device using a microcomputer, including a CPU 81, RAM 82,
It is composed of a ROM 83, an input interface 84, and an output interface 85.

Input port in input interface 84
The detection signal of the second sensor 60 is converted into a digital signal by the A/D converter 61 and input to _a1 . Input port a ₂ has the aforementioned chaf sheave 2.
The output of a lever position detection sensor 78, which is provided at the base end of the first fin angle changing operation lever 71 and uses a potentiometer, is converted into a digital signal by an A/D converter 62 and input.

A threshing switch 63 that is turned on when the threshing clutch is engaged is connected to the input port _a3 , and when the threshing switch 63 is turned on, the input port _a3 becomes high level.

A reaping switch 64 that is turned on when the reaping clutch is engaged is connected to the input port _a4 , and when the reaping switch 64 is turned on, the input port _a4 becomes high level.

An automatic switch ₆₅ that is turned on when the fin angle of the chaff sheave should be automatically adjusted is connected to the input port a5, and when the automatic switch 65 is turned on, the input port _a5 becomes high level.

A grain changeover switch ₆₆ is connected to the input port _a6 , which is operated to switch depending on whether the grain to be threshed is rice or wheat. The switch 66 is turned on to set the level.

A wet/dry changeover switch ₆₇ is connected to the input port _a7 , which is operated depending on whether the grain to be threshed is dry or wet. Switch 6 to set it to high level
7 is turned on.

The grain culm sensor 6 that detects the conveyance of grain culm to the above-mentioned threshing device is connected to the input port _a8 , and when the sensor 6 detects the conveyance of the grain culm, the input port
a ₈ becomes high level.

The output of the switch circuit 68 is given to the input port _a9 , and the switch circuit 68 is turned on and off by the output of the second rotation sensor 69, and the second rotation sensor 69 detects the low rotation of the second screw 29. When the output of the sensor 69 becomes high level upon detection of , the switch circuit 68 is turned on and the input port _a9 becomes high level. The output of the switch circuit 68 is a light emitting diode (LED) 99 whose one end is grounded to the body.
is given to.

A switch circuit 86 is connected to the output port _b1 of the output interface 85, and when the switch circuit 86 is turned on, the light emitting diode 91 lights up. The output port _b1 outputs a high level signal when the control device 80 is not operating normally, and the light emitting diode 91 is lit by the high level signal.

A switch circuit 87 is connected to the output port _b2 , and when the switch circuit 87 is turned on, the light emitting diode 92 lights up. The output port _b2 outputs a high level signal when each sensor or switch is not operating normally, and the light emitting diode 92 is lit by the high level signal.

A switch circuit 88 is connected to the output port _b3 , and when the switch circuit 88 is turned on, the automatic lamp 93 is turned on. The output port _b3 outputs a high level signal when the automatic switch 65 for automatically adjusting the fin angle of the chafing sheath 21 is turned on, and the automatic lamp 93 is turned on by the high level signal.

A switch circuit 89 is connected to the output port _b4 , and when the switch circuit 89 is turned on, the excitation coil 94c of the electromagnetic relay 94 is excited. This electromagnetic relay 94 has an interlocking normally open contact 94a and a normally closed contact 94b, and the normally open contact 94a connects the power supply line and one end of the motor 73 for driving the operation lever 71 ( The normally closed contact 94 is interposed between the
b is interposed between the same terminal of the motor 73 and body ground. The output port _b4 outputs a high level signal when tilting the fin 21b of the chaff sheave 21 (when reducing the fin angle).

A switch circuit 90 is connected to the output port _b5 , and when the switch circuit 90 is turned on, the excitation coil 95c of the electromagnetic relay 95 is excited. This electromagnetic relay 95 has an interlocking normally open contact 95a and a normally closed contact 95b, and the normally open contact 95a connects the power supply line with the other end of the motor 73 (the terminal that becomes high voltage when the motor 73 rotates forward). It is interposed between
Further, the normally closed contact 95b is interposed between the same terminal of the motor 73 and the body ground. Applicable output port
_b5 outputs a high level signal when raising the fin 21b of the chaff sheave 21 (when increasing the fin angle).

Therefore, when the output port b ₄ becomes high level, the excitation coil 94c of the electromagnetic relay 94 is energized, its normally open contact 94a is closed, and the motor 73 rotates in reverse, and when the output port b ₅ becomes high level, the electromagnetic relay 95 The excitation coil 95C is energized and its normally open contact 95
A is closed and the motor 73 is driven to rotate in the normal direction.

A switch circuit 96 is connected to the output port _b6 , and when the switch circuit 96 is turned on, an alarm buzzer 97 and a light emitting diode 98 light up. As will be described later, the output port _b6 outputs a high level signal when the second reduction amount does not fall within a predetermined range even if the fin angle of the chaf sheave 21 reaches the maximum or minimum.

The operation of the harvester having such a configuration will be explained.
When manually adjusting the fin angle, turn off the automatic switch 65, operate the operating lever 71 to disengage from the feed member 76, and rotate the lever 71 to release the push-pull wire 21f. When pulled or pressed, the fins 21b stand up or tilt, and the fin angle increases or decreases.

Harvesting and threshing under such conditions will result in
The grain stalks harvested by the reaping section K are fed to the grain stalk transfer device 11 of the threshing device 3. The grain culm inherited by the grain culm transfer device 11 is inserted with its tip side into the handling chamber 15 through the handling port of the threshing device 3, and is then moved into the handling teeth 16, 16 of the handling barrel 17 which is being driven to rotate. The threshed grains and other grated materials pass through the receiving net 18 and fall onto the swinging sorting device 19, and the swinging of the device 19 performs specific gravity sorting. I, the fins 21b, 21b of the chaf sheave 21...
The fine grains, etc. that have passed through the gap between them fall into the first take-out section 27, and the second and third reduced products are blown onto the stroke rack 22 by the wind generated by the windshield device 33, and hit the prevention cloth 42. The grains fall onto the straw rack 22 and are re-sorted while being loosened by the swinging action of the straw rack 22, and the second reduction products such as ear cut grains and grains with stalks attached are transferred to the second extraction section 30.
The waste is blown up from the second screw 29 into the second thrower cylinder 48 by the blower 47 and re-sorted by the processing cylinder 51. Relatively large pieces of straw, etc. are transported to the rear by the wind sent from the winnowing device 33 while being interfered with by the prevention sheet 42, and are discharged outside the machine from the dust exhaust port 36, while relatively lightweight debris is sucked and discharged. The dust is sucked in through the suction port 40 of the dust device 37 and discharged to the outside of the machine through the exhaust port 41.

Next, automatic adjustment of the fin angle in the chaff sheave 21 will be explained based on the flowcharts of FIGS. 5 and 6. First, when the key switch is turned on, the counter BZ indicates that the buzzer 97 has sounded, and the flag K indicates that the cutting operation is in progress.
and the flag D indicating that it is time to start mowing are all reset (=0), and each condition is set corresponding to the grain to be threshed. That is, whether the grain is rice or wheat is set with the grain selection switch 66, whether it is dry wood or wet wood is set with the dry/wet selection switch 67, and then the threshing operation is performed. The upper limit α and lower limit β of the second reduction amount, the maximum value L and minimum value S of the angle of the fin 21b in the chaff sheave 21, and the start of mowing The chaff angle M to be set at each time is set respectively. This angle M is approximately the median value of the variation range of the Finn angle during automatic adjustment.

Now, the control device 80 determines whether or not the reaping work has started using the reaping start flag D, and if the reaping start flag D is in the reset state (D=0), it is assumed that the reaping work has not started yet. , the stored value P of the chaff angle is stored as the fin setting angle M at the time of starting mowing.

In this state, when the automatic switch 65 is turned on to automatically adjust the chaff angle and the threshing switch 63 is turned on with the threshing clutch engaged to drive the threshing device 3, the control device 80 first adjusts the fin angle. The motor 73 is continuously driven in normal rotation so that the minimum value S is reached, and the fin angle is determined from the detection result p of the lever position detection sensor 78, and when the fin angle reaches the minimum value S, the drive of the motor 73 is stopped.

When reaping work and threshing work are started in such a state, the harvested grain culm is conveyed to the threshing device 3, the grain culm sensor 6 is turned on, and the automatic lamp 93 is turned on to notify that automatic adjustment can be performed. do. Then, when the reaping switch 64, in which the reaping clutch is in the engaged state, is on and the reaping flag K is in the reset state (K=0), the reaping is performed for a predetermined period of time.
After waiting for T ₁ to elapse, the motor 73 is continuously driven in reverse so that the fin angle becomes the set angle M at the start of mowing. Then, the fin angle is set to the set angle M based on the detection value p of the lever position detection sensor 78.
When it is detected that the grass has become dry, the driving of the motor 73 is stopped, and the reaping flag K, which indicates that the reaping work has started, is set (K=1).

This is because when the threshing operation starts, the amount of threshing is not constant, so the second reduction amount is unstable, and the detection result of the second sensor 60 is also extremely unstable. Automatically adjusting _the fin angle based on
Sorting is carried out with the fin angle at its smallest, that is, with the highest sorting accuracy, and after a predetermined time _T1 has elapsed during which the threshing amount has stabilized, the fin angle is immediately set to the set angle M, and after being in this state, This fin angle M
Centering around this state, the fin angle is controlled by intermittently driving the fin 21b in accordance with the second reduction amount based on the detection result of the second sensor 60.

On the other hand, in a non-working state where either the automatic switch 65 or the threshing switch 63 is off or in a state where the fin angle is manually adjusted, the automatic lamp 93 is turned off, and in a working state where both switches 65 and 63 are on, the grain culm sensor 6 If the grain culm is not detected, the automatic lamp 93 is turned on and off, and the motor 73 is driven to set the fin angle to the minimum value S, so that the fin 21b is tilted to its highest precision state, and the grain culm is transported. It is in good condition.

Next, control of the fin angle based on the second reduction amount detected by the second sensor 60 will be explained based on the flowchart of FIG. First, check the alarm counter BZ to see if the buzzer 97 has already sounded, and if the alarm counter BZ is in the reset state (BZ=0) and the buzzer 97 is not yet sounding, the lever position detection sensor 78 The fin angle p corresponding to the lever position detected by is read as the stored value P. Then, when the second reduction amount detected by the second sensor 60 exceeds the upper limit value α (or lower limit value β) that allows proper sorting by the chaff sieve 21, the fin angle can be set during automatic adjustment. Maximum value L
It is determined from the detection value of the lever position detection sensor 78 whether or not the value is equal to or higher than the maximum value L (or the minimum value S or higher). The fins 21b are rotated in reverse (or forward) to increase (or decrease) the fin angle by a predetermined amount Δp, increase (or decrease) the gap between the fins 21b, and increase (or decrease) the amount of grains etc. passing through the gap. ), and the amount of grains fed to the second take-out section 30 is reduced (or increased). If the secondary reduction amount does not fall within the predetermined range (α to β) even with the change Δp in the fin angle caused by driving the motor 73 for a short time, the motor 73 is driven again for a short time and the fin angle is changed again by Δp.
The motor 73 is driven intermittently until the second reduction amount falls within a predetermined range.

In this case, when the change Δp in the fin angle caused by driving the motor 73 for a predetermined period of time does not match the actual fin angle, it is determined that the operating lever 71 is being operated manually, and the fin angle is adjusted by manual operation. Maintain manual operation status to prioritize. Then, when the motor 73 is driven or when it is determined that the second return amount is appropriate, the mowing start flag D is set to the set state (D=1), and the alarm counter BZ is set to the reset state (BZ =0).

On the other hand, when the second reduction amount is above the upper limit value α (or below the lower limit value β) and the Finn angle is below the maximum value L (or below the maximum value S), the alarm counter BZ is advanced one step. . If this state continues until the value of counter BZ reaches _T2 , the buzzer will sound 9.
7 and lights up the light emitting diode 98. The alarm is canceled when the automatic switch 65 is turned off or when the alarm conditions are no longer satisfied.

During such work, the amount of second objects falling into the second take-out section 30 increases, and the second screw 29
If the second rotation sensor 69 detects that the number of revolutions has fallen below a predetermined value due to overload, the automatic adjustment of the fin angle of the chaff sheave 21 is prohibited and the automatic lamp 93 is turned off. The motor 73 is continuously reversed so that the fin angle becomes the maximum value L that can be set, and the amount of grains passing between the fins 21b is increased to increase the amount of grains that fall into the first takeout section 27. To reduce the amount of second items falling into a number take-out part 30. In this case, the fin angle p at the time when the second screw 29 becomes overloaded is stored as a memory value P, and when the overload is eliminated, the fin angle is set to p.

Furthermore, at the end of one stroke of reaping work, there is no conveyed grain culm, and the grain culm sensor 6 is turned off.

At the end of such reaping work, the threshing amount is not constant and the second return amount is also unstable, just as at the start of the work, so if the fine angle is controlled based on the second return amount, the sorting accuracy will be reduced. Since the reduction is significantly reduced, automatic adjustment based on the second reduction amount is prohibited, the automatic lamp 93 is set to a blinking state, the fin angle P at the time when the grain culm sensor 6 is turned off is stored as the memory value P, and the chaff sieve is adjusted after a predetermined time _T3 . The motor 73 is continuously driven so that the fin angle of the fins 21 becomes the minimum value, and the sorting is performed in a state where the fins are most inclined, that is, in a state with the highest accuracy. At this time, the reaping flag K is set to a reset state (K=0). After finishing one stroke of reaping work, turning to the next step and starting reaping work again, the grain culm is detected by the sensor 6, and during the predetermined time _T1 when the grain flow rate is low, the grain is removed by the chaff sheave 21. Sorting can be performed with the fin angle in a high sorting state, but for a specified time
After T ₁ has elapsed, the fin angle is set to the stored value at the end of reaping, and automatic adjustment of the chaff angle is started in this state.

On the other hand, automatic fin angle adjustment in the case of manual threshing without reaping in the apparatus of the present invention will be described. When the automatic switch 65 is turned on to automatically adjust the fins, and the threshing clutch is engaged and the threshing switch 63 is turned on, the fin angle of the chaff sheave 21 becomes small, as in the case of the harvesting operation described above, and the most It is considered to be highly accurate. When the grain culm to be threshed is inserted into the handling chamber 15 in this state, the grain culm sensor 6 is turned on. In this case, since it is manual threshing, the reaping clutch is in the disengaged state and the reaping switch 64 is in the off state, so the fin angle is immediately automatically adjusted without setting the fin angle to the standard state. Therefore, automatic adjustment is started at a fin angle state with high selection accuracy, and automatic adjustment is performed centering on this fin angle state. The subsequent automatic adjustment is the same as the automatic adjustment during harvesting described above, and the fin 2 is adjusted so that the second return amount becomes the predetermined value.
1b is driven intermittently.

In addition, in the above-mentioned embodiment, the configuration was such that the Finn angle was automatically adjusted based on the second reduction amount, but instead of this, a configuration was adopted in which the Finn angle was automatically adjusted based on the first flow rate, the third flow rate, and the grain culm supply amount. Good too.

〔effect〕

In the present invention, when the automatic switch 65 is turned on, the threshing clutch is engaged, the threshing switch 63 is turned on, and it is detected that the grain culm has been conveyed, the chaff sheave is Since the fin angle of No. 21 is automatically adjusted according to the amount of grain processed through threshing, stable sorting is possible without the risk of a decrease in sorting accuracy even during periods when the amount of grain processed is not stable at the start of threshing work. become.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention.
The figure is an external perspective view of a harvester equipped with the device of the present invention.
Fig. 2 is a longitudinal sectional view of the device of the present invention, Fig. 3 is a side view of the main part of the chaff sheave and the vicinity of the operating lever, Fig. 4 is an electronic circuit diagram of the main part of the device of the invention, and Figs. 5 and 6.
The figure is a flowchart for explaining the operation of the apparatus of the present invention. 3... Threshing device, 6... Grain culm sensor, 11...
Grain culm transfer device, 17...handling cylinder, 21...chaff sieve, 21b...fin, 27...first grain take-out part, 29...second screw, 30...second take-out part, 50... ...Processing chamber, 51...Processing cylinder, 60
...Second sensor, 63...Threshing switch, 64...
...Reaping switch, 65...Automatic switch, 69...
...Second rotation sensor, 71...Operation lever, 73...
Motor, 76... feeding member, 80... control device.

Claims (1)

[Claims] 1. A means for changing the angle of the fins in the chaff sheave, a means for automatically adjusting the angle of the fins according to the throughput of the threshing section, a means for instructing to perform the automatic adjustment, and a means for detecting engagement and disengagement of the threshing clutch. ,
The method further comprises: a means for detecting grain culms to be transported; and means for starting the automatic adjustment after waiting for a predetermined time to elapse at the time of instructing the automatic adjustment, engaging the threshing clutch, and detecting the grain culm. Characteristic threshing equipment.