KR200388761Y1 - Bean automatic sheller - Google Patents

Abstract

The present invention relates to a bean threshing machine that automatically harvests soybeans by shaking the soybeans harvested, and improves its structure so that the bean curds pipe is rotated on the curved portion without forming a separate long-range outlet on one side of the curved portion. It is to be able to smoothly discharge the location-free distance to the outside of the body.

To this end, the main body (3) having a bean-to-bean opening (23), a drive shaft (5) installed and rotated inside the main body, and a hole through which beans pass through the outer surface of the drive shaft is rotated The formed mesh 8, the striking member 19 installed on the driving shaft and knocking on the bean stalk, the connecting rod 33 having one end eccentrically installed on the driving shaft, and one end connected to the rod to be discharged so as to be inclined. In the bean automatic threshing machine consisting of a guide plate 32, a fan 39 installed on one side of the lower part of the main body to suck and discharge foreign matter, and a cover 22 installed on the upper part of the main body so as to be opened and closed, the mesh body ( At least one distance-free discharge member 56 is installed on the beanbag coiling prevention pipe 26 on the curved portion 31 located at one side of 8), and the distance to the cover 22 positioned directly above the curved portion is a main body ( Even if it is discharged outside of 3) Mugeori the outlet 24 is integrally formed to the hayeoseo.

Description

Soybean Sheller {omitted}

The present invention relates to a bean threshing machine that automatically harvests soybeans by shaking the harvested soybean stand, and more specifically, a bean which allows a distance such as soybean stand to be discharged away from the soybean threshing machine in the process of automatically crushing the harvested soybean stand. Relates to an automatic thresher.

1 is a perspective view showing a conventional bean threshing machine, FIG. 2 is a longitudinal sectional view of FIG. 1, and FIG. 3 is a perspective view showing a bean discharge part side, and is rotated by a driving force of a motor M, which is a power means, Threshing drum 1 having two threshing blades, a housing 10 provided at a lower portion of the threshing drum 1, and a receiving plate 2 through which a plurality of discharge holes pass, and one of the housings 10. In the threshing apparatus to remove foreign substances such as pods or soybean leaves made of a drive unit 20 which is a means for transmitting the driving force of the motor to the threshing drum 1 to rotate the threshing drum 1, the housing ( In the lower part of the receiving plate 2 provided in the inside of 10) the eccentric to the front of the drive pulley 21 connected to the motor (M) shaft to drive the threshing drum 1 of the pulley of the drive unit 20 One side is connected to the vertical link 111 combined and inclined at a predetermined angle A primary sorting plate 110, a secondary sorting plate 120 coupled to a lower portion of the primary sorting plate 110 and having a plurality of discharge holes 121 on an inner surface thereof, and the secondary sorting plate 120. Small holes (131) coupled to the lower portion of the through-hole so that sand or soil falls down, and a large hole (大 孔) through which holes are dropped to one side of the small hole (131) It consists of a sorting unit 100 consisting of a tertiary sorting plate 130 having a).

In addition, one side of the housing 10 is further provided with a conveying unit 200 so that the foot soaked by the tertiary sorting plate 130 is dropped through the large hole 132 can be transferred.

The conveyer 200 has a conveying belt 210 having an interlocking shaft 211 connected to a drive shaft 1a of the threshing drum 1 by a belt B therein, and an outer surface of the conveying belt 210. The receiving cup 220 is coupled to a plurality of portions to be transported upward by the conveying belt 210 and the foot beans selected by the receiving cup 220 is transferred to the upper side to the discharge portion 230 is discharged to the outside. consist of.

In addition, one side of the secondary sorting plate 120 is further provided with a control port 140, the control unit 140 is retracted groove portion 11 that can be moved up / down the housing 10 It is formed on one side of.

Therefore, by applying power to the drive motor (M) so that the bean threshing apparatus is driven, and then put the harvested soybean pod in the inlet 12 formed on the upper side of the housing 10, soybean pod is configured inside the housing (10) It is threshed by the threshing drum (1) and separated into foot beans and foreign matters, and falls to the receiving plate (2). At this time, foreign matters such as pods or soybeans, except for the soybeans, are blown from the other side of the housing 10 by a fan (P). A part is discharged out through the foreign matter discharge port 13 formed in the part is dropped to the receiving plate 2 as it is, such as foot beans.

The foot bean and the foreign matter falling through the receiving plate 2 is moved down by the inclined primary sorting plate 110 while being shaken by the primary sorting plate 110, wherein a part of the foreign matter is blown again. The foreign matter discharged out of the housing 10 through the foreign matter discharge port 13 by (P), and the foreign substances and the foreign matter not completely discharged down the primary sorting plate 110 is again the secondary sorting plate 120 Foot beans are dropped through the plurality of discharge holes 121 which are perforated on the inner surface of the secondary sorting plate 120 by shaking of the secondary sorting plate 120, and the crushed foreign matter that is not filtered is the secondary sorting plate. In the process of moving down to the tertiary sorting plate by the suction suction of the blowing fan is discharged out through the foreign matter discharge portion 13 configured on the other side of the housing.

In addition, foreign matter and foot beans falling through the discharge hole 121 of the secondary sorting plate 120 or descending on the secondary sorting plate 120 are coupled to the lower portion of the secondary sorting plate 120. The foreign matter and foot beans that are seated on the tea sorting plate 130 come down the third sorting plate 130 by shaking the tertiary sorting plate 130, and the foreign matter such as soil or sand is 3 The tea beans fall out through the small holes 131 formed on one side of the sorting plate 130, the green beans and bean pods continue to descend, the green beans fall through the large hole 132 through one side of the small holes 131, and the pods of beans 3 It is discharged to the end of the car sorting plate (130).

Foot beans falling down by the shaking of the tertiary sorting plate 130 and falling through the large hole 132 are accommodated in the receiving cup 220 of the transfer part 200 provided on one side of the housing 10. It is discharged out through the discharge portion 230 formed on the upper side of the transfer portion 200 by the receiving cup 220 is transferred as it falls.

However, the conventional soybean threshing machine having such a structure has an advantage that only pure green soybeans can be obtained by completely separating foreign substances such as pods or soybeans through one operation, but various problems have been generated.

First, since the bean pods are separated manually from the soybean stand by peeling by protrusions formed on the outer circumferential surface of the threshing drum, it is impossible to realize full automation of soybean threshing, which is limited to use in farms growing a large amount of soybeans. There is.

Second, even though the beans were separated from the bean pods by the rotation of the threshing drum, the discharge hole formed in the support plate was blocked by the bean pods, so that the beans separated from the pods were discharged through the foreign matter outlet without falling down the discharge plate. .

In order to prevent this, when the size of the discharge hole formed in the support plate is large, only beans are not discharged through the support plate and a larger amount of pods are discharged.

Third, the soybeans are passed through the 1st, 2nd, and 3rd sorting plates in the process of being sown and discharged so that foreign matters are removed as well as soybean pods. It was.

Fourth, the structure of mounting them in the housing so that the primary, secondary, and tertiary sorting plates are shaken by the eccentric motion of the vertical link is not only complicated, but also the durability is reduced because they are suspended at once.

Therefore, in order to solve the above problems, a soybean threshing machine having a new structure has been developed by the applicant and registered as Utility Model No. 348685.

Soybean threshing machine configuration of the Utility Model Registration No. 348685 is disclosed in detail in the publication, so a detailed description thereof will be omitted.

However, such a conventional utility model registration No. 348685 completely solves the above problems, but there are inconveniences in use as follows.

First, since the distance is freely discharged through the distance outlet, when the bean stand that is not broken finely is discharged, the distanceless outlet is blocked by the bean stand, so the smooth distance discharge is not achieved.

Second, there is no structure to support the bag in the process of putting the beans discharged through the automatic bean transporting device in the bag, so if the bottom surface is wet, the bag is contaminated with moisture, so the bean has a fatal defect.

Third, there was a limit in transporting using a tractor because the three-point link is not provided in the bean thresher.

Fourth, there is a side wall in the bean discharge guide plate has been troublesome to remove the foreign matter trapped in the bean discharge hole formed in the bean discharge guide plate in the state of complete bean threshing.

Fifth, the blowing fan is installed so as to pass through the bean discharge guide plate and the part through which the dust is discharged to the outside of the housing according to the operation of the blowing fan, but the bean discharge guide plate is closed so that the outside air There was a limit to inhalation, which prevented foreign matter from discharging far out of the housing.

Sixth, when a large amount of soybeans at the same time into the soybean loading slot is placed on the roller and the load is placed on the rotating cylindrical wire mesh, a fatal problem occurs that the wire mesh does not rotate even when the roller rotates.

The present invention has been devised to solve such a conventional problem, and improves its structure without forming a separate distance-free outlet on one side of the bent portion, the bodyless distance on the bent portion in accordance with the rotation of the anti-cold pipe The purpose is to allow the discharge to the outside of the smoothly.

Another object of the present invention is to ensure that the bean stand is not caught between the main body and the net in the process of adding the bean stand.

Still another object of the present invention is to install a scaffold for placing the bag on one side of the automatic bean feeder so that it is possible to prevent the bag from getting wet.

Still another object of the present invention is to equip one side of the main body with a three-point link to easily transport the bean thresher using a tractor.

According to an aspect of the present invention for achieving the above object, a main body formed with a bean-to-beans inlet on one side, a drive shaft installed on the upper portion of the main body to rotate as the drive of the motor is transmitted by a known power transmission means, and The mesh is formed on the outside of the drive shaft is rotated and the periphery is formed through the beans through the periphery, the striking member is installed on the drive shaft to knock the bean stand in accordance with the rotation of the drive shaft, the one end is eccentrically installed and the other end Is connected to the rod hinged to the rod is installed in the main body, the end is connected to the rod and at the same time is installed to be inclined so as to be located in the lower portion of the net body and the bean discharge guide plate formed with a plurality of bean discharge hole at the end, the lower work of the main body It is installed on the side and sucks foreign substances discharged along the bean discharge guide plate while rotating at high speed by the rotational force of the drive shaft In the bean automatic threshing machine consisting of a fan and a cover installed to open and close on the upper portion of the main body, at least one distance-free discharge member is installed on the beanbag coiling prevention pipe on the curved portion located on one side of the mesh body and The cover located in the upper portion is provided with a bean automatic threshing machine, characterized in that the distance-free outlet is formed integrally to allow the distance-free discharge to the outside of the main body.

Hereinafter, with reference to Figures 4 to 14 showing the present invention as an embodiment in more detail as follows.

Figure 4 is a perspective view showing a bean threshing machine of the present invention, Figure 8 is a longitudinal cross-sectional view showing the distance range outlet side of the present invention and Figure 9 is a partial perspective view of Figure 8, the same as the configuration of Utility Model Registration No. 348685 of the configuration of the present invention The configuration will be omitted and the same reference numerals will be given.

The present invention has a phenomenon that the bean stand inlet 23 is formed on one side of the main body 3 and the bean stand inserted between the main body 3 and the mesh 8 on the rotating direction side of the mesh body 8 of the bean stand inlet. Bean to pinch prevention means are provided.

In the embodiment of the present invention, the bean to pinch preventing means is fixed on the frame constituting the main body 3 as shown in FIGS. 5 to 7, and one end is bent close to the bean to anti-wrap pipe 26. A support plate 53 on the plate, a guide plate 54 fixed to the support plate and positioned one end of the flange 8a of the mesh 8, and fixed to overlap the inside of the guide plate, Although configured as an extension piece 55 to be located, it is not necessary to specifically limit any configuration as long as it is configured so that the bean stand is not caught between the main body 3 and the net body 8 in the process of injecting the bean stand.

Accordingly, even when the bean stand is introduced through the bean stand inserting hole 23 in the process of rotating the mesh body 8 in a direction opposite to the rotational direction of the drive shaft 5, the frame forming the main body 3 between the frame 8 and the mesh 8. Since the gap is closed by the guide plate 54 and the extension piece 55 so as not to be pinched therebetween, the phenomenon in which the rotation of the mesh 8 is stopped in the state where the bean stand is inserted is prevented.

The mesh 8 has a large number of through-holes formed so that the bean threshed from the bean stand freely falling into the bean discharge guide plate 32, and the bean stand winding prevention pipe 26 adjacent to the bean stand inlet 23 is smooth of the bean stand. Screw 52 is fixed so that the input is possible, the rear end of the screw is provided with a plurality of striking member 19 for striking the bean stand.

The beanbag coiling prevention pipe 26 located on the curved part 31 adjacent to the mesh 8 is provided with at least one distance-free discharge member 56 as shown in FIGS. 8 and 9, and the curved part 31 is provided. In the cover 22 located directly above, the distance-free outlet 24 is formed integrally so that the distance-free is discharged to the outside of the main body (3).

 At this time, the end of the distance-free discharging member 56 may be formed as a spatula so that the distance can be discharged more quickly. In this case, the beans located on the curved portion 31 are captured by the discharge hole 31a. Since the distance-free discharging member 56 in the state that can not escape, as well as the distance, there is a possibility to discharge the bean together, as shown in Figure 9, the end portion was made in a "V" shape.

Accordingly, the beans in the curved portion 31 is discharged together with the distance when the bean-wound-preventing pipe 26 is rotated so that the distance-free discharge member 56 discharges the distance freely positioned on the curved portion 31 to the outside. The phenomenon is prevented beforehand.

10A and 10B are perspective views showing the structure of the bean discharge guide plate, the opening and closing plate 57 is hingedly rotatably coupled to the end of the bean sorting plate 37, and the opening and closing plate 57 and the bean sorting plate 37 Both ends of the elastic member 58, such as a coil spring, are fixed between the side walls.

When the foreign matter such as pods are picked up by the bean sorting plate 37 in the process of threshing the beans, the bean threshing machine is continuously operated without flipping the opening and closing plate 57 to one side as shown in FIG. By vibrating the bean discharge guide plate 32 so that the foreign substances in the bean sorting plate 37 formed integrally with the bean discharge guide plate 37 is automatically discharged to the outside.

FIG. 11 is a longitudinal sectional view showing the net stop means, wherein a known locker (not shown) is installed on the cover 22 and the main body 3 so that the cover 22 is closed on the main body 3. The cover is prevented from being opened arbitrarily by the locker, and the inside of the cover 22 is pressed against the edge of the net body 8 to prevent the phenomenon that the rotation of the net is stopped even if some degree of overload is applied to the net by excessive input of the bean stand. Stop prevention means is provided.

In one embodiment of the present invention, the mesh stop preventing means is provided with a lever 59 rotatably installed at both sides of the cover 22, and roller bearings 60 respectively installed at the lever and connected to the outer peripheral surface of the edge of the mesh. The elastic member 61 is provided between the cover and the lever to bias the roller bearing toward the mesh body side.

12 is a longitudinal cross-sectional view showing the outside air suction hole formed in the bean discharge guide plate, the bent portion 63 is formed in the lower portion of the bean discharge guide plate 32 and the bean discharge guide plate adjacent to the bent portion as well as the bent portion ( 32 is formed with an external air suction hole 62 to allow a larger amount of external air to be sucked into the fan housing 45 when the fan 39 is driven.

13 is a perspective view showing the bean discharge port side, a known bean automatic feeder 64 is provided on one side of the main body 3, and the baggye scaffold around the shaft 65 at the front lower part of the automatic feeder. (66) is provided so that it can be folded.

The bag scaffold 66 may be fixed to the automatic bean transport device 64, but to minimize the volume by folding the bag scaffold 66 during transportation and storage of the bean automatic sheller.

14 is a perspective view of a state in which a three-point link is mounted on one side of the present invention, and a support frame 67 is fixed to one side of the main body 3, and the bean auto threshing machine of the present invention is supported on the support frame 67. Three-point links 68a and 68b are installed to be connected to a tractor (not shown) so that they can be carried more conveniently.

Referring to the operation of the present invention configured as described above are as follows.

First, when the cover 22 is covered and locked to the main body 3 by a known locker, the roller bearings 60 installed on both sides of the cover 22 are in close contact with the edges of the mesh 8 as shown in FIG. 11. The elastic member 61 provided between the 22 and the lever 59 receives a compressive force, and accordingly, the roller bearing 60 fixes the mesh 8 to the shaft 6 by the restoring force of the elastic member 61. It is pushed toward the roller (7).

After that, when the drive shaft 5 is rotated by applying power to the motor 4, the mesh 8 placed on the roller 7 of the shaft 6 rotates in a direction opposite to the rotation direction of the drive shaft 5. At this time, the connecting rod 33 is eccentrically connected to the drive shaft 5 is a pivoting movement so that the bean discharge guide plate 32 by the connecting rod and one end hinged rod 34, I'm going to swing.

In such a state, when the bean stand with the bean husk is pushed into the bean stand inlet 23, the bean stand is more easily inserted by the screw 52 fixed to the inlet side of the bean stand winding prevention pipe 26, so that the bean stand is wound. Since the hitting by the plurality of striking members 19 provided on the outer circumferential surface of the pipe 26, soybean peels from the soybean shell as the soybean peels off from the soybean stand.

As described above, in the process of threshing the bean stand through the bean stand inlet 23 and thus threshing, the bean stand prevents the phenomenon of being caught between the main body 3 and the mesh 8 by means of the net stop. At the same time, the phenomenon of being wound on the drive shaft 5 by the bean-wound pipe 26 is prevented.

When the bean is threshed from the bean stand by the striking of the striking member 19 according to the rotation of the drive shaft 5, the curved portion along the rail 9 is fixed in a spiral direction along the inner circumferential surface of the mesh body 8. 31) in the process of transport to the side of the bean, of course, foreign matters such as bean shells free fall down (bean discharge guide plate side) through the through-hole formed in the net body (8).

However, since the weightlessness is not discharged through the through hole formed in the mesh 8, the rail 9 moves toward the curved portion 31, and some of the threshed beans cannot escape through the through hole of the mesh 8 and the curved portion 31 with the distance. After moving to the side side is free to fall downward through the discharge hole (31a) formed in the curved portion (31).

The distance that is moved to the curved portion 31 is a bean-to-wrap prevention pipe 26 is continuously rotated through the distance-discharge outlet 24 formed in the cover 22 by the distance-free discharge member 56 installed on the outer circumferential surface ( 3) is discharged to the outside.

When the bean and some of the bean husks that are threshed from the bean stand by the strike of the striking member 19 and pass through the net body 8 are freely dropped onto the bean discharge guide plate 32, the bean discharge guide plate is connected to the connecting rod 33. By doing the up and down rocking movements such as striking the movement so they will move downward.

In this process, in one embodiment of the present invention, the bean discharge guide plate 32 has an external air suction hole 62 formed thereon, so that a larger amount of external air is sucked into the fan housing 45. And foreign substances such as bean shells are discharged farther to the outside of the body.

When the bean passes through the bean sorting plate 37 in a state in which the flakes of the bean shell are removed in a continuous operation, the bean is transported upward by a known bean automatic transfer device 64 and placed in a bag. In the design, the bag containing the bean is placed on the bag scaffold 65 so that the bag can be wet even if the threshing point is soaked.

In the process of threshing the beans, when foreign matter such as a relatively large soybean shell reaches the bean sorting plate 37 by driving the fan 39, the opening and closing plate 57 is temporarily stopped as shown in FIG. When the) is opened, the bean sorting plate 37 is moved up and down by the connecting rod 33 so that foreign matters placed on the bean sorting plate 37 are discharged to the outside through the opening and closing plate 57.

In this way, after the foreign matter in the soybean sorting plate 37 is automatically discharged to the outside of the main body 3, the opening and closing plate 57 that has been flipped to one side while tensioning the elastic member 58 is reduced to an initial state as shown in FIG. 10A. It is possible to continue threshing the beans.

As described above, the bean thresher of the present invention has several advantages as follows.

First, since the rangeless discharge rod is rotated to the distanceless outlet side while the distanceless discharge rod is rotated, the distanceless outlet is blocked by the bean stand.

Secondly, the bean is discharged through the automatic bean feeder while the bag is placed on the baggage scaffold, so that the beans contained in the bag can be prevented from spoiling even if the threshing of the bean is carried out in the field of the marsh.

Third, the three-point link is provided on one side of the main body, so that the tractor can be easily transported to the field, such as a relatively heavy weight wheat threshing machine.

Fourth, it is configured to open and open the opening and closing plate on one side of the bean discharge guide plate so that foreign matters are automatically released by idling even without manual discharge of foreign substances such as bean shells located on the bean discharge guide plate. Since it is discharged to the foreign matter, it becomes convenient to remove the foreign matter.

Fifth, the external air suction hole is formed on the bean discharge guide plate, so that when the fan is driven, a larger amount of external air is introduced into the fan housing, so that foreign substances such as bean husks can be discharged farther from the main body. When threshing soybeans, it prevents the occurrence of respiratory diseases due to dust generation.

Sixth, a large amount of soybeans are inserted into the soybean inlet at a time, so even if a certain amount of load is placed on the net, there is a net stop prevention means, which prevents the antibody from being stopped. .

1 is a perspective view showing a conventional bean thresher

2 is a longitudinal cross-sectional view of FIG.

Figure 3 is a perspective view showing the bean discharge side

4 is a perspective view showing the bean threshing machine of the present invention

5 is a perspective view showing a forearm inlet side of the present invention

Figure 6 is a plan view showing the beans vs. jamming means

FIG. 7 is a right side view of FIG. 6

Figure 8 is a longitudinal cross-sectional view showing the distance-free outlet side of the present invention.

9 is a partial perspective view of FIG. 8

10a and 10b are perspective views showing the structure of the bean discharge guide plate

11 is a longitudinal sectional view showing the net stop means;

12 is a longitudinal sectional view showing an outside air suction hole formed in the bean discharge guide plate;

Figure 13 is a perspective view showing the bean outlet side

14 is a perspective view of a state in which a three-point link is mounted on one side of the present invention;

Explanation of symbols for main parts in the drawings

3: body 8: mesh

22: cover 23: bean stand slot

26; Soybean Versatile Pipe 32: Bean Discharge Guide Plate

37: bean sorting plate 56: distance-free discharge member

57: opening and closing plate 59: lever

60: roller bearing 62: outside air suction hole

64: bean automatic transport device 66: stool scaffold

67: support frame 68: three-point link

Claims (9)

The main body has a bean-to-bean opening on one side, the drive shaft is installed on the upper portion of the main body is rotated as the drive of the motor is transmitted by a known power transmission means, and the outer side of the drive shaft is installed and rotated, the beans on the circumferential surface A connecting body coupled to the mesh formed with a through-hole formed therein, a striking member installed on the driving shaft and knocking the bean stand according to the rotation of the driving shaft, and one end eccentrically installed on the driving shaft and the other end installed on the main body. And, one end is connected to the rod at the same time is installed to be inclined so as to be located at the lower portion of the net and the bean discharge guide plate formed with a plurality of bean discharge hole at the end, and is installed on one side of the lower portion of the main body while the beans rotate at high speed by the rotational force of the drive shaft A fan for suctioning and discharging foreign substances discharged along the discharge guide plate, and installed on the upper part of the main body so as to be opened and closed. In the bean automatic threshing machine consisting of a cover which is provided, at least one distance-free discharge member is installed on the beanbag coiling prevention pipe on the bent portion located on one side of the mesh, and the distance is directly outside the body of the cover located at the upper portion of the bent portion. Soybean threshing machine, characterized in that the distance-free outlet is formed integrally to be discharged to. The method of claim 1, Bean soybean threshing machine, characterized in that the bean soybean jamming means for preventing the phenomenon that the soybeans put on the mesh rotation direction side of the soybean soybean inlet port is pinched between the main body and the network. The method of claim 2, The bean to pinch preventing means is fixed on the frame constituting the main body and the support plate on the plate one end is bent close to the bean to the anti-winding pipe, and the guide plate is fixed to the support plate one end is located close to the flange of the mesh And, soybean sheller, characterized in that consisting of an extension piece which is fixed to overlap the inner side of the guide plate located inside the flange. The method of claim 1, Forming a bent portion in the lower portion of the bean discharge guide plate soybean automatic sheller, characterized in that by forming an external air suction hole on the bean discharge guide plate adjacent to the bent portion as well as the bent portion. The method of claim 1, A bean auto threshing machine, characterized in that the hinge plate is rotatably hinged to the end of the bean discharge guide plate and fixed to both ends of the elastic member between the opening and closing plate and the side wall of the bean discharge guide plate. The method of claim 1, One side of the main body is provided with a known soybean automatic conveying device and the bean automatic threshing machine, characterized in that installed in the front lower portion of the soybean automatic conveying device to be able to fold the baggage about the axis. The method of claim 1, Fixing the supporting frame on one side of the main body, the supporting frame, characterized in that the three-point link for the connection with the tractor was installed soybean. The method of claim 1, The cover is to lock to the main body by a locker and the inside of the cover bean soybean threshing machine, characterized in that it further comprises a net stop means for pressing the edge of the net body. The method of claim 8, The stop means for stopping the mesh is installed between the lever rotatably on both sides of the inside of the cover, a roller bearing installed at each of the levers and connected to the outer peripheral surface of the edge of the mesh, and installed between the cover and the lever to bias the roller bearing to the mesh side. Bean auto threshing machine, characterized in that composed of an elastic member.