JP6228465B2 - Threshing device - Google Patents

Description

  The present invention relates to a threshing apparatus such as a combine equipped with a layer thickness sensor for detecting a layer thickness of a processed product.

  There is known a threshing apparatus including a layer thickness sensor that detects a layer thickness of a processed product being transferred on a rocking sorter. In this type of threshing apparatus, the fin opening of the chaff sheave provided in the swing sorter is variable, and the fining opening is automatically controlled according to the detection value of the layer thickness sensor to improve the sorting accuracy.

  The layer thickness sensor is usually configured to include a contact-type detection body that rotates in accordance with the layer thickness of the workpiece, and a potentiometer that detects the rotation position of the detection body. The layer thickness of the processed material is detected by being disposed above (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-178431

  However, in Patent Document 1, since the potentiometer constituting the layer thickness sensor is disposed in an exposed state above the rocking sorter, the potentiometer may become an obstacle when the rocking sorter is attached or detached. There was a risk of damage to the potentiometer.

The present invention was created with the object of solving these problems in view of the above-mentioned circumstances, and the invention of claim 1 transfers the processed material leaked from the handling chamber through the receiving network. In a threshing apparatus comprising an oscillating sorter that performs sorting while detecting a layer thickness sensor that detects a layer thickness of a processed product that is transferred on the oscillating sorter, the layer thickness sensor is the layer thickness of the processed product. And a potentiometer for detecting the rotational position of the detection body, and for attaching the layer thickness sensor to the receiving net support frame disposed above the swinging sorter. A potentiometer is arranged on the side of the receiving network support frame and above the lower end of the receiving network support frame, and between the mounting bracket of the layer thickness sensor and the receiving network support frame to receive the rotating detection body. Bottom edge of net support frame Ri is a threshing apparatus being characterized in that arranged suspended downwards.
The invention according to claim 2 is the threshing apparatus according to claim 1, further comprising a cover body that covers the rotation shaft of the detection body and the potentiometer.
The invention according to claim 3 is the threshing apparatus according to claim 1 or 2 , wherein the potentiometer is arranged between receiving net reinforcement frames arranged in parallel at a predetermined interval on the back side of the receiving net. is there.
A threshing apparatus according to any one of claims 1 to 3 , wherein the invention according to claim 4 is capable of holding the detection body in a retracted state retracted upward from the lower end of the receiving net support frame. It is .

According to the first aspect of the present invention, since the potentiometer is disposed on the side of the receiving net support frame and above the lower end of the receiving net support frame, the potentiometer may become a hindrance or swing when the swing sorter is attached or detached. The potentiometer can be prevented from being damaged by contact with the moving sorter, and the potentiometer is disposed between the mounting bracket of the layer thickness sensor and the support frame support frame, so that the potentiometer is more reliably protected and damaged. Can be prevented.
According to the second aspect of the present invention, since the cover body that covers the rotating shaft of the detection body and the upper portion of the potentiometer is provided, it is possible to suppress damage to the potentiometer due to the processing object flying from the handling chamber and the influence on the detection. Can do.
According to the invention of claim 3, since the potentiometer is arranged between the receiving net reinforcing frames arranged in parallel on the back side of the receiving net at a predetermined interval, not only the arrangement space for the potentiometer can be secured, but also the receiving pot can be received. When the net is attached or detached, interference between the receiving net reinforcing frame and the potentiometer can be prevented .
Also, according to the invention of claim 4, the detection body, since the possible held in a storage state at the retreat position above the lower end of受網support frame, upon detachment of the oscillating sorting member, the detection member is in the way It is also possible to prevent the detection body from being damaged due to contact with the rocking sorter.

It is a left view of a combine. It is a left view of a threshing apparatus. It is a principal part right view of the threshing apparatus which shows the state at the time of rice wheat harvest. It is a principal part right view of the threshing apparatus which shows the state at the time of soybean harvest. It is a principal part front view of the threshing apparatus which shows a cover closed state. It is a principal part front view of the threshing apparatus which shows a cover open state. It is a principal part top view of a threshing apparatus. It is a side view of a layer thickness sensor. It is a front view which shows the arrangement structure of a layer thickness sensor. It is a perspective view which shows the arrangement structure of a layer thickness sensor. It is a side view which shows the detection state and storage state of a layer thickness sensor. It is a perspective view which shows the detection state and storage state of a layer thickness sensor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a general-purpose combiner, and the general-purpose combine 1 includes a harvesting unit 2 that harvests stem stalks, and a threshing unit (threshing device) 3 that threshs and sorts grains from stems and straws that are put into whole straws. A grain tank 4 for storing the selected grain, a discharge auger 5 for discharging the grain in the grain tank 4 to the outside of the machine, a post-processing unit 6 for post-processing the threshed waste, A driving unit 7 on which the driver gets on and a crawler type traveling unit 8 are provided.

  The cutting unit 2 includes a header 9 that is connected to the front end of the machine body so as to be able to move up and down, a divider 10 that weeds uncut stems at the front end of the header 9, and a cutting blade (not shown) that cuts off the uncut stems. ), A reel 11 for picking up uncut stems and cut stems, an auger 12 for collecting the scraped stems at predetermined positions in the width direction, and a threshing unit 3 for collecting stems collected by the auger 12 And a feeder 13 that feeds the whole grain into the threshing unit 3.

  As shown in FIG. 2, the threshing unit 3 includes a handling chamber 14 into which all the cutting stalks are thrown in, and a sorting chamber 15 that is disposed below the handling chamber 14 and that sorts the processed material that has leaked from the handling chamber 14. The grain selected in the sorting chamber 15 is transferred to the grain tank 4 via the first cerealing device (not shown).

  The handling chamber 14 is disposed along the lower side of the handling cylinder 17 that hooks and rotates the pedicle with the handling teeth 16 that project from the outer periphery, and the processed product that has been shed by rubbing with the stylus. A receiving net 18 that leaks and a dust exhaust port 19 that discharges the processed material that has reached the end of the handling chamber 14 without leaking from the receiving net 18 are configured.

  The sorting chamber 15 collects the first thing, the swinging sorter 20 that sorts the processed material leaked from the receiving net 18 while transporting it, the red pepper 21 that generates the sorting wind in front of the swinging sorter 20, and the like. The first horizontal spiral 22 and the second horizontal spiral 23 for recovering the second thing. The first thing recovered by the first horizontal spiral 22 is the grain tank through the first cerealing device. The second thing transferred to 4 and collected by the second horizontal helix 23 is returned to the inside of the handling chamber 14 or on the rocking sorter 20 via the second cerealing device 24 (see FIG. 7).

  As shown in FIGS. 2 to 4, the rocking sorter 20 includes a grain pan 25 that sequentially transfers the processed material leaked from the receiving net 18 backward, and a chaff sheave 26 that sifts and sorts the grain behind the grain pan 25. The grain sieve 27 further sifts and selects the grain that has leaked from the chaff sheave 26, the extension chaff sheave 28 that is selectively attached to the rear of the chaff sheave 26 or the grain sheave 27, and the rear that is selectively attached to the rear of the chaff sheave 26 or the grain sieve 27. The stroking assembly includes a stroking rack 29, and is reciprocally swung continuously at a predetermined cycle by a swinging mechanism (not shown).

  The chaff sheave 26 includes a plurality of fins 26a arranged in parallel at a predetermined interval in the front-rear direction. Each of the fins 26a is inclined in a front-rear and rear-high shape, and the processed material is caused to leak from the gap between the fins 26a while the processed material is transferred rearward along with the swinging of the swing sorter 20. The treated product leaked here is collected as the first product through the grain sieve 27, and the treated product not leaked is collected as the second product.

  Each fin 26a is configured to be able to rotate back and forth with the upper end side as a fulcrum, and is connected to a fin driving motor (not shown) via a cam mechanism (not shown). The gap (fin opening) between the fins 26a in the chaff sheave 26 can be changed based on the change in the angle of each fin 26a according to the driving. The balance between the amount of processed material leaked from the chaff sheave 26 and the amount of processed material to be reduced second is appropriate by executing automatic sorting control that automatically increases or decreases the fin opening according to the amount of processed material (layer thickness). This makes it possible to perform a highly accurate sorting process.

  The rocking sorter 20 of the present embodiment includes an adjustment element for each crop that is adjusted for each crop to be harvested in order to cope with a plurality of types of crops. For example, as shown in FIG. 3, when harvesting rice or wheat, in order to promote single grain formation by second reduction (branch treatment), the straw rack 29 (cereal rather than fin) is placed downstream of the chaff sheave 26. In the case of harvesting soybeans, as shown in FIG. 4, in order to reduce soybean damage due to the second reduction, an extended chaff sheave 28 is arranged downstream of the chaff sheave 26. The strok rack 29 is arranged on the downstream side. In addition, as shown in FIG. 3, when harvesting rice and wheat, an extended chaff sheave 28 and strolac 29 are arranged on the downstream side of the grain sheave 27 to reduce the contamination of sawdust and the like to the second reduction. As shown in FIG. 4, when harvesting soybeans, the extended chaff sheave 28 and the straw rack 29 arranged on the downstream side of the grain sieve 27 are removed.

  As shown in FIGS. 5 and 6, a maintenance opening 31 that can be opened and closed by the cover body 30 is formed on the outer surface of the handling chamber 14. As shown in FIG. 6, the cover body 30 is opened. When operated, maintenance work such as attachment / detachment of the receiving net 18 can be performed through the opening 31.

  The receiving net 18 of this embodiment is divided into front and rear and left and right, and each divided receiving net 18 has a receiving net frame 18a that defines its outer shape, and a net member 18b provided inside the receiving net frame 18a. And a plurality of receiving net reinforcing frames 18c provided at predetermined intervals in the front-rear direction.

  A receiving net support frame 32 extending in the front-rear direction is provided above the swing sorting body 20, and a lower end portion of the receiving net 18 is fixed to the receiving net support frame 32. The receiving net support frame 32 of the present embodiment is located at the approximate center of the left-right width of the swinging sorter 20 in plan view, and extends at least from the grain pan 25 to the chaff sheave 26.

  Note that the rocking sorter 20 of the present embodiment is provided with a plurality of gathering plates 33 for bringing the processed material closer to the center in the left-right width direction. In the present embodiment, four approach plates 33 are provided on each of the left and right ends of the swing sorter 20 from the grain pan 25 to the chaff sheave 26.

  Next, the layer thickness sensor 34 which is a main part of the present invention will be described with reference to FIGS.

  As shown in FIGS. 2 to 12, a layer thickness sensor 34 for detecting the layer thickness of the processed material transferred on the rocking sorter 20 is provided above the rocking sorter 20. The layer thickness sensor 34 includes a detection body 35 that freely rotates in accordance with the layer thickness of the workpiece, a potentiometer 36 that detects the rotation position of the detection body 35, and a contact support for the detection body 35 at the initial position in the detection state. And a stopper member 37 that contacts the workpiece, and rotates according to the thickness of the detection body 35, thereby adjusting the layer thickness of the workpiece based on the detection value of the potentiometer 36. It becomes possible to specify. Incidentally, the detection body 35 of the present embodiment is arranged such that the drooping posture slightly retracted from the vertical is set as the initial posture, and the receding angle increases as the layer thickness of the processed material increases.

  In the present embodiment, the layer thickness sensor 34 is attached using the receiving net support frame 32 located above the rocking sorter 20 and at the approximate center of the left-right width of the rocking sorter 20 in plan view. In this way, as shown in FIG. 7, it becomes possible to accurately detect the layer thickness of the processed product brought closer to the left and right center side of the swinging sorter 20 by the gathering plate 33.

  In the present embodiment, a plurality of layer thickness sensors 34 are provided with a predetermined interval in the front-rear direction with respect to the receiving network support frame 32. Specifically, a first layer thickness sensor 34 for detecting the layer thickness of the processed material transferred by the Glen pan 25 and a second layer thickness for detecting the layer thickness of the processed material transferred at the start end side of the chaff sheave 26. A sensor 34, a third layer thickness sensor 34 for detecting the layer thickness of the processed product transferred on the end side of the chaff sheave 26, and a layer thickness 4 for detecting the layer thickness of the processed product transferred by the extended chaff sheave 28 at the time of soybean harvesting A second layer thickness sensor 34.

  Each of these layer thickness sensors 34 detects the layer thickness of the processed material, but the first layer thickness sensor 34 also has a role of detecting the start and end of cutting, and the first layer thickness sensor 34. When the presence of the processed material is detected, it is determined that the cutting operation is being performed, and automatic fin fin control of the chaff sheave 26 is started to open the fin 26a, while when the first layer thickness sensor 34 does not detect the processed material, the cutting is performed. The fin automatic control is stopped when it is determined that the operation is finished, and the fin 26a is closed. In other words, in the situation where there are few processed objects, the most waste is mixed into the waste, so closing the fins 26a of the chaff sheave 26 according to the end of cutting reduces the contamination of the waste and improves the sorting accuracy. Can do. However, since the processed material is always full on the grain pan 25 depending on the situation, the second layer thickness sensor 34 is necessary to accurately grasp the sorting situation on the front side of the swing sorter 20.

  On the other hand, on the rear side of the rocking sorter 20, the layer thickness of the processed material is detected for the purpose of preventing scattering outside the machine due to the overflow of the grain. For example, when the rice wheat is harvested as shown in FIG. 3, the third layer thickness sensor 34 detects the layer thickness of the processed material in the vicinity of the end portion of the chaff sheave 26, thereby grasping the overflow of the processed material in the chaff sheave 26. 4, when the soybean is harvested as shown in FIG. 4, the fourth layer thickness sensor 34 detects the layer thickness of the processed material in the vicinity of the end portion of the extended chaff sheave 28, thereby grasping the overflow of the processed material in the extended chaff sheave 28. can do.

  Next, the mounting structure of the layer thickness sensor 34 will be described with reference to FIGS.

  As shown in FIGS. 8 to 12, the layer thickness sensor 34 according to the embodiment of the present invention includes a detection body 35 that rotates in accordance with the layer thickness of the processing object, and a potentiometer that detects the rotation position of the detection body 35. 36. The material of the detection body 35 can be arbitrarily selected as long as it is in contact with the object to be processed and rotates according to the layer thickness. For example, the detection body 35 of the present embodiment is formed of a relatively hard material. However, the detection body 35 can be formed of an elastically deformable spring material or a soft resin material. Further, it is possible to prevent the detection body 35 from being plastically deformed or damaged due to catching of branches or the like included in the processed material.

  As the potentiometer 36, there are a spring built-in type with a built-in spring for urging the input shaft 36a in a predetermined direction, a springless type without a built-in spring, and the like, but the rotation position of the detection body 35 can be detected. Any type can be selected. For example, in this embodiment, the springless type potentiometer 36 is selected and the detection body 35 is freely rotated, but a spring built-in type may be selected.

  The layer thickness sensor 34 of the present embodiment is attached to a receiving net support frame 32 disposed above the swing sorter 20. At this time, the potentiometer 36 is arranged on the side of the receiving net support frame 32 and above the lower end of the receiving net support frame 32, and the freely rotating detector 35 is below the lower end of the receiving net support frame 32. It is arranged by hanging. In this way, it is possible to prevent the potentiometer 36 from getting in the way when the swinging sorter 20 is attached or detached, or the potentiometer 36 from being damaged by contact with the swing sorter 20.

  In the present embodiment, when the potentiometer 36 is arranged on the side of the receiving net support frame 32, the side of the receiving net support frame 32 opposite to the side on which the receiving net 18 is attached (the side on which the receiving net attaching bolt 18d is turned). A potentiometer 36 is disposed on the side surface of the first side. In this way, there is an advantage that the layer thickness sensor 34 does not get in the way when the receiving net 18 is attached or detached.

  The potentiometer 36 is attached to the side portion of the receiving net support frame 32 via an attachment bracket 38. The mounting bracket 38 is made of a plate member bent into a crank shape in plan view, and the base end side is bolted to the side portion of the receiving net support frame 32 with the potentiometer 36 attached to the distal end side. At this time, the potentiometer 36 is disposed between the mounting bracket 38 and the receiving net support frame 32 in a plan view, as shown in FIG. Thereby, the potentiometer 36 can be protected more reliably and its breakage can be prevented.

  The input shaft 36a of the potentiometer 36 protrudes outward through the mounting bracket 38, and the detection body 35 is integrally attached to the distal end side thereof. Thereby, the detection body 35 freely rotates about the input shaft 36a as a rotation axis, and the rotation angle of the detection body 35 can be detected by the potentiometer 36.

  A cover body 39 that covers the potentiometer 36 main body and the input shaft 36a is integrally provided at the upper end on the distal end side of the mounting bracket 38. According to such a cover body 39, it is possible to avoid that the processing object flying from the handling chamber 14 directly hits the potentiometer 36 main body or the input shaft 36a, so that damage to the potentiometer 36 and influence on detection are suppressed.

  Further, in the present embodiment, when the potentiometer 36 is attached to the receiving network support frame 32, as shown in FIG. 10, the potentiometer 36 is disposed between the receiving network reinforcing frames 18c arranged side by side at a predetermined interval on the back side of the receiving network 18. doing. In this way, not only can the space for arranging the potentiometer 36 be secured, but also interference between the receiving net reinforcing frame 18c and the potentiometer 36 can be prevented when the receiving net 18 is attached or detached.

  Next, the storage structure of the layer thickness sensor 34 will be described with reference to FIGS.

  The layer thickness sensor 34 is configured to be able to switch the state of the detection body 35 between a detection state in which the detection body 35 is freely rotated in contact with the workpiece and a storage state supported at the storage position. For example, when the attaching / detaching operation of the swinging sorter 20 is performed, the detection body 35 is switched to the housed state, so that the detection body 35 obstructs the attachment / detachment of the swinging sorter 20 or is detected by contact with the swinging sorter 20. It is possible to prevent 35 from being damaged. In the present embodiment including a plurality of layer thickness sensors 34, as shown in FIG. 3, the layer thickness sensor 34 to be used is selected according to the crop to be harvested, and the detection body 35 of the layer thickness sensor 34 that is not used is accommodated. Can be kept in a state.

  In the layer thickness sensor 34 according to the embodiment of the present invention, the state of the detection body 35 is configured to be switchable between a detection state that freely rotates in contact with the workpiece and a storage state that is supported at the storage position. A stopper member 37 that contacts and supports the detection body 35 at the initial position in the detection state is provided, and the stopper member 37 is also used as a storage position support member that supports the detection body 35 at the storage position. This eliminates the need for a dedicated storage position support member and simplifies the structure and reduces costs.

  The stopper member 37 of the present embodiment has an initial position support state in which the detection body 35 is abutted and supported at the initial position in the detection state (see the right side in FIGS. 11 and 12), and a storage position in which the detection body 35 is supported in the storage position. In order to enable switching to the support state (see the left side of FIGS. 11 and 12), the stopper member 37 is elastically biased from the initial position support state to the storage position support state side, and the stopper member 37 is changed to the initial position support state. An engaging portion 38a to be locked is provided on the mounting bracket 38, and the stopper member 37 is switched to the storage position support state in accordance with the engagement releasing operation of the engaging portion 38a. In this way, the storing operation of the detection body 35 becomes easy.

  More specifically, the stopper member 37 of the present embodiment is configured by a torsion spring, and extends forward from one end of the coil portion 37a supported by the mounting bracket 38 via the bolt 40 and the coil portion 37a. And a second arm portion 37c that extends downward from the other end of the coil portion 37a and is biased rearward. The second arm portion 37c is arranged in parallel to the outer side of the detection body 35, and has a bent portion 37d that enters the front side or the lower side of the detection body 35 at the distal end side, and the detection body is brought into contact with the bent portion 37d. The rotation range of the front 35 or the lower 35 is regulated. Reference numeral 37e denotes a detachment preventing portion bent at the tip of the bent portion 37d.

  As shown in FIGS. 11 and 12, the mounting bracket 38 has a protruding portion 38b protruding downward, and the engaging portion 38a described above is formed at the tip thereof. When the bent portion 37d of the stopper member 37 is engaged with the engaging portion 38a against the biasing force, the bent portion 37d is locked in the initial position supported state, and the detection body 35 is contacted at the initial position in the detected state. It becomes possible to support.

  Further, when the front end portion (the locking portion 37e) of the bent portion 37d engaged with the engaging portion 38a is operated downward, the engagement of the bent portion 37d with the engaging portion 38a is released, so that the stopper The bent portion 37d is rotated rearward by the urging force of the member 37, and is engaged with the stopper portion 38c (formed behind the engaging portion 38a) of the mounting bracket 38 to be held in the storage position supported state. At this time, the detection body 35 rotates rearward together with the bent portion 37d and is held in the stored state by contact with the bent portion 37d. And the detection body 35 in the housed state is sandwiched between the mounting bracket 38 and the bent portion 37d of the stopper member 37, thereby preventing unnecessary rotation in the housed state and extending the life of the potentiometer 36. Can do.

  The detection body 35 in the housed state is held above the lower end of the receiving net support frame 32, but the engaging portion 38 a of the mounting bracket 38 is arranged below the lower end of the receiving net support frame 32. Thereby, damage to the layer thickness sensor 34 can be prevented while maintaining the workability of switching between the detection state and the storage state.

  Further, an inclined portion 38d that is continuously connected from the stopper portion 38c to the engaging portion 38a is formed between the engaging portion 38a and the stopper portion 38c of the mounting bracket 38. Then, when the detection body 35 in the housed state is turned to the detection state side against the urging force of the stopper member 37, the bent portion 37d of the stopper member 37 rides on the inclined portion 38d and is engaged with the engaging portion 38a. The As a result, the detection body 35 can be switched to the detection state simply by rotating the detection body 35 in the storage state to the detection state side, so that the storage release operation of the detection body 35 becomes easy. Incidentally, an operation for switching the detection body 35 to the retracted state (an operation for releasing the stopper member 37 with respect to the engaging portion 38a of the mounting bracket 38) and an operation for switching the detection body 35 to the detection state are as shown in FIG. If the cover 30 is opened, the opening 31 can be easily performed.

  According to the present embodiment configured as described, the swing sorting body 20 that sorts the processed material leaked from the handling chamber 14 through the receiving net 18 while transporting, and is transported on the swing sorting body 20. In the threshing unit 3 including the layer thickness sensor 34 that detects the layer thickness of the processed product, the layer thickness sensor 34 is freely rotated according to the layer thickness of the processed product, and the detection body 35. And a potentiometer 36 for detecting the rotational position of the oscillating plate, and when the layer thickness sensor 34 is attached to the receiving net support frame 32 disposed above the swinging sorter 20, the side of the receiving net support frame 32 is provided. In addition, since the potentiometer 36 is disposed above the lower end of the receiving net support frame 32 and the freely rotating detector 35 is disposed below the lower end of the receiving net support frame 32, the swing sorter 20 When removing and attaching Nshometa 36 or to obstruct, possible to prevent the potentiometer 36 may be damaged by contact with the oscillating sorting member 20.

  Further, since the cover body 39 that covers the rotation axis (input shaft 36a) of the detection body 35 and the potentiometer 36 is provided, the damage to the potentiometer 36 due to the processing material flying from the handling chamber 14 and the influence on detection are suppressed. be able to.

  Further, since the potentiometer 36 is disposed between the receiving net reinforcing frames 18c arranged in parallel on the back side of the receiving net 18 with a predetermined interval, not only can the space for arranging the potentiometer 36 be secured, but the receiving net 18 is attached and detached. In this case, interference between the receiving net reinforcing frame 18c and the potentiometer 36 can be prevented.

  Further, since the potentiometer 36 is disposed between the mounting bracket 38 of the layer thickness sensor 34 and the receiving net support frame 32, the potentiometer 36 can be protected more reliably and can be prevented from being damaged.

  Further, since the detection body 36 can be held in the retracted state above the lower end of the receiving net support frame 32, the detection body 35 becomes an obstacle when the swing sorter 20 is attached or detached. It is also possible to prevent the detection body 35 from being damaged by contact with 20.

1 General purpose combine 3 Threshing part (threshing device)
14 Handling chamber 15 Sorting chamber 16 Teeth 17 Handle cylinder 18 Receiving net 18c Receiving net reinforcement frame 20 Oscillating sorting body 32 Receiving net support frame 34 Layer thickness sensor 35 Detector 36 Potentiometer 36a Input shaft 37 Stopper member 37a Coil portion 37b 1 arm portion 37c second arm portion 37d bent portion 38 mounting bracket 38a engaging portion 38b projecting portion 38c stopper portion 38d inclined portion 39 cover body

Claims (4)

An oscillating sorter for sorting while transferring the processing material leaked from the handling chamber via the receiving net, and a layer thickness sensor for detecting the layer thickness of the processing material being transferred on the oscillating sorter. In threshing equipment,
The layer thickness sensor includes a detection body that rotates in accordance with the layer thickness of the workpiece, and a potentiometer that detects the rotation position of the detection body, and is disposed above the swinging selection body. When attaching the layer thickness sensor to the receiving support frame,
A potentiometer is arranged on the side of the receiving network support frame and above the lower end of the receiving network support frame, and between the mounting bracket of the layer thickness sensor and the receiving network support frame. A threshing device, wherein the threshing device is arranged by being hung downward from the lower end of the support frame.   The threshing apparatus according to claim 1, further comprising a cover body that covers a rotation shaft of the detection body and an upper portion of the potentiometer.   The threshing apparatus according to claim 1 or 2, wherein the potentiometer is arranged between receiving net reinforcement frames arranged in parallel on the back side of the receiving net at a predetermined interval. The threshing apparatus according to any one of claims 1 to 3 , wherein the detection body can be held in a retracted state retracted upward from a lower end of the receiving net support frame.

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