JP7666293B2 - combine - Google Patents

Description

The present invention relates to a combine harvester.

Conventionally, the threshing control of a combine harvester involves configuring the angle of the dust plate (dust guide) to be freely changeable, providing a sensor to detect the reaction force of the stalks acting on the dust plate, and controlling the angle of the dust plate so that the detection value of the reaction force of the stalks acting on the dust plate by the sensor becomes a predetermined value (see Patent Document 1).

JP 2009-055808 A

The sensor detects the reaction force of the stalks acting on the dust-sending plate, and does not directly detect when the amount of stalks increases during the threshing process and causes a blockage. Moreover, because the sensor is located in the part where the threshing teeth move from top to bottom, it is difficult to properly detect the blockage of stalks, and good threshing control is difficult to achieve. There was also the issue that the reaction force could not be detected when the dust-sending plate was parallel to the direction of rotation of the threshing teeth.

The present invention was made in consideration of the above, and aims to provide a combine harvester that can detect clogging of stalks in the threshing chamber early and accurately, enabling good threshing.

The first aspect of the present invention is
In a combine harvester provided with a threshing device (5) for threshing the harvested crop by a reaping section (4) provided at the front of a machine body moving forward by a traveling device (2), a threshing drum (53) having threshing teeth (52) is driven to rotate in a threshing chamber (51) of the threshing device (5), and a jamming sensor (70) for detecting jamming of the harvested crop is provided above a portion where the threshing teeth (52) move from bottom to top in the first half of the threshing process in which the harvested crop moves from the entrance side of the threshing chamber (51) to the exit side,
This combine harvester is characterized in that the forward speed of the machine body is gradually reduced by a predetermined amount each time the detection of a clogging by the clogging sensor (70) continues for a predetermined period of time or more.
The second aspect of the present invention is
In a combine harvester provided with a threshing device (5) for threshing the harvested crop by a reaping section (4) provided at the front of a machine body moving forward by a traveling device (2), a threshing drum (53) having threshing teeth (52) is driven to rotate in a threshing chamber (51) of the threshing device (5), and a jamming sensor (70) for detecting jamming of the harvested crop is provided above a portion where the threshing teeth (52) move from bottom to top in the first half of the threshing process in which the harvested crop moves from the entrance side of the threshing chamber (51) to the exit side,
This combine is characterized in that when the detection of a clogging by the clogging sensor (70) continues for a predetermined period of time or longer, the prime mover is stopped.
The first invention related to the present invention is a combine harvester equipped with a threshing device 5 that threshes the harvested crop by a cutting section 4 provided at the front of the body moving forward by a traveling device 2, in which a threshing drum 53 having threshing teeth 52 is driven to rotate within a handling chamber 51 of the threshing device 5, and a jam sensor 70 is provided above the part where the threshing teeth 52 move from bottom to top in the first half of the first half where the harvested crop is threshed as it moves from the entrance side to the exit side of the handling chamber 51.

According to the first invention related to the present invention , a threshing drum 53 having threshing teeth 52 is driven to rotate within the threshing chamber 51 of the threshing device 5, and a pressure-sensitive jamming sensor 70 for detecting jamming of the harvest is provided above the part where the threshing teeth 52 move from bottom to top in the first half of the threshing process as the harvest moves from the entrance side to the exit side of the threshing chamber 51.Therefore, jamming of the harvest can be detected at an early stage in the first half of the threshing chamber 51, and the upper position of the part where the threshing teeth 52 move from bottom to top is the area where the harvest is lifted up and accumulates, so that jamming can be detected appropriately.

A second invention related to the present invention is the combine harvester of the first invention related to the present invention , in which the notification means 6g, 6h are activated when the clogging sensor 70 detects a clogging.

According to the second invention related to the present invention, in addition to the advantageous effects of the first invention related to the present invention , the notification means 6g, 6h are activated when the clog sensor 70 detects a clog, so that the pilot can immediately take action to clear the clog, such as slowing down the forward speed of the aircraft.

A third invention related to the present invention is a combine harvester according to the first or second invention related to the present invention, in which the forward speed of the machine body is reduced by a predetermined amount when the detection of a clog by the clog sensor 70 continues for a predetermined time or longer.

According to the third invention related to the present invention, in addition to the advantageous effects of the first or second invention related to the present invention , when the clog sensor 70 continues to detect a clog for a predetermined period of time or longer, the forward speed of the machine body is slowed down by a predetermined amount, so that the clog is automatically cleared.

A fourth invention related to the present invention is a combine harvester of any of the first to third inventions related to the present invention, in which the forward speed of the body is gradually reduced by a predetermined amount each time the clogging detection by the clogging sensor 70 continues for more than a predetermined time .

A fifth aspect of the present invention is a combine harvester according to any one of the first to fourth aspects of the present invention, in which the prime mover is stopped when the detection of clogging by the clogging sensor 70 continues for a predetermined period of time or longer .

According to the fifth invention related to the present invention, in addition to the advantageous effects of any of the first to fourth inventions related to the present invention , if the clogging detection by the clogging sensor 70 continues for a predetermined period of time or more, the prime mover is stopped, thereby preventing clogging and preventing the handling drum 53 from becoming unable to rotate and being broken or the transmission part from being damaged.

FIG. 1 is a side view of a combine harvester according to an embodiment of the present invention. FIG. 2 is a side cross-sectional view of the threshing device of the combine. FIG. FIG. 2 is a front cross-sectional view of a threshing apparatus showing another embodiment of the present invention. FIG. 2 is a front cross-sectional view of a threshing apparatus showing another embodiment of the present invention. 11A-11C are side views of a treating tooth support member 54 showing different treating tooth patterns in an embodiment of the present invention.

An example of the application of the present invention to a general-purpose combine harvester that inputs whole stalks is described with reference to Figures 1 to 6.

<Overall configuration of the combine>
A general-purpose combine harvester is used to harvest rice, wheat, etc., and comprises a machine frame 1, a pair of left and right crawler-type traveling devices 2 that support the machine body, an elevator 3 supported on the front of the machine frame 1 so as to be able to swing up and down, a reaping section 4 connected to the front end of the elevator 3, a threshing device 5 disposed on the left side of the machine frame 1, a grain tank disposed on the right side of the threshing device 5, and a driving section 6 disposed on the right side of the elevator 3 and the threshing device 5 and in front of the grain tank. The traveling devices 2, elevator 3, reaping section 4, threshing device 5, grain transport device of the grain tank, etc. are driven by a prime mover (engine) mounted on the machine frame 1.

The driver's seat 6a, the engine start switch 6b, the HST lever 6c that switches the drive to the traveling device 2 between forward and backward and operates the hydrostatic continuously variable transmission that changes the speed continuously, the steering lever 6d that switches the left and right drive of the left and right traveling devices 2 on and off to steer the machine and manually move the reaping unit 4 up and down, the reaping/threshing clutch lever 6e, the control device 6f that controls each component, the monitor 6g, the warning buzzer 6h, etc.

<Reaping unit 4>
The harvesting section 4 comprises a pair of left and right grass dividing rods 7, a platform 8, a rotating reel 9 for raking in the harvested material, a clipper-type cutting device 10 disposed across the left and right grass dividing rods 7 at the front end of the platform 8, and an auger 11 disposed on the platform 8 and rotating around an axis oriented in the left-right direction.

A hydraulic cylinder is provided between the machine frame 1 and the elevator 3, and the elevator 3 is arranged so that it can be swung up and down around a left-right axis relative to the threshing device 5. When the elevator 3 is swung up and down, the reaping unit 4 goes into a working state where the platform 8 is lowered close to the ground, and a non-working state where the platform 8 is raised high above the ground.

The rotating reel 9 is rotatably supported by a reel arm 12 that is supported to be able to swing up and down around a swing axis P relative to the harvesting unit 4, and is supported so as to always face downward on a rotating body 13 supported by the reel arm 12. It has multiple tines 14 that rake in the planted stalks.

When the combine is driven forward with the reaping section 4 lowered, the planted culms are separated by the reaping rod 7 into culls to be harvested and non-culls, and the planted culms to be harvested are scraped onto the platform 8 by the rotating reel 9, and then cut by the clipper-type cutting device 10. The harvested culms scraped onto the platform 8 are sent sideways by the auger 11 to the front of the elevator 3, and are then scraped further into the elevator 3. The harvested culms are transported backward by the elevator 3, and the entire harvested culms from the base to the tip are fed into the threshing device 5.

＜Ogre＞
The auger 11 has left and right spirals on the right and left sides of the front of the elevator 3, and transports the harvested stalks laterally to the front of the elevator 3 and rakes them into the front of the elevator 3 using a rake-in rod.

<Elevator>
The elevator 3 comprises a rectangular cylindrical elevator case body 30 having front and rear openings, and a conveyor installed within the elevator case body 30 for transporting the harvested stalks to the threshing device 5 at the rear.

<Threshing equipment>
The threshing device 5 has a threshing drum 53 having threshing teeth 52 mounted on a cylindrical threshing chamber 51 formed at the top by a threshing drum cover 50, and the threshing drum 53 is axially mounted facing in the fore-and-aft direction of the machine body.

The threshing drum 53 has a threshing tooth support member 54 with multiple threshing teeth 52 arranged at a predetermined interval in the radial direction (radial direction) from the threshing drum shaft 55, and the threshing tooth support members 54 are arranged at a predetermined interval from each other in the circumferential direction (rotational direction). A polygonal drum section 56 is provided inside the threshing tooth support member 54, and the drum section 56 and the threshing tooth support member 54 are arranged so that the apex (corner) of the drum section 56 faces between the threshing tooth support members 54 in the circumferential direction of the threshing drum shaft 55.

The threshing drum 53 has a conical tapered section 57 at the tip of the drum section 56, with a larger diameter at the rear, and a spiral 58 at the rear for transporting the harvested stalks.

The lower part of the handling chamber 51 formed by the handling drum cover 50 is equipped with a standard winnower 59a, a swinging sorting shelf 59b, a transfer shelf section 59c, a sieve 59d, a straw rack 59e, a first conveyor 59f, and a second conveyor 59g.

In addition, a spreader-type cutting and processing device 60 is provided at the rear of the threshing device 5 to cut the straw dust and other materials discharged from the threshing device 5. The cutting and processing device 60 is provided with a rotating blade (chopper) 61 that cuts the discharged stalks and other materials, and a cutting blade 62 that can be raised and lowered at the bottom of the front part of the cutting and processing device 60.

Therefore, when the harvested stalks are supplied to the threshing device 5 from the elevator 3, the threshing drum 53 rotates in the handling chamber 51 of the threshing device 5 in the direction of the arrow A to perform the threshing process. At that time, as the threshing drum 53 rotates in the direction of the arrow A, the harvested stalks are threshed while being transported to the outlet 50d of the handling chamber 51, and the threshed grains fall from the receiving net 50b onto the oscillating sorting shelf 59b, where they are sorted by the oscillation of the oscillating sorting shelf 59b and the air blown from the winnower 59a. The grains that fall from the oscillating sorting shelf 59b are collected by the first conveyor 59f and sent to the grain tank. The straw is sent from the outlet 50d to the cutting and processing device 60, where it is shredded and then discharged outside the machine.

The threshed grains are sent to a grain tank where they are temporarily stored, and are discharged from the grain tank by the discharge auger 15 as needed.

The threshing drum cover 50 is composed of a receiving net 50b, which is fixed to the machine frame 50a of the threshing device 5 and is formed in a net shape through which grains and the like fall downward, and an upper threshing drum cover 50c, which is formed of an upward-opening plate body whose inner side in the left-right direction of the machine body is pivotally supported relative to the receiving net 50b and whose outer side is locked in a closed state by a locking device.

<Threshre jam prevention control>
A pressure-sensitive jamming sensor 70 is provided on the entrance side of the handling chamber 51 (the front half of the handling chamber 51) to detect when the threshing drum 53 rotates in the direction of the arrow A and the threshing teeth 52 move from bottom to top, causing the threshing drum 53 to become jammed. The jamming sensor 70 is provided on the upper threshing drum cover 50c.

When the jam sensor 70 detects a jam for one or more consecutive seconds, the control device 6f sounds the alarm buzzer 6h as a notification means of the driving unit 6 and/or turns on the warning lamp of the monitor 6g to notify the operator of the occurrence of a jam. Note that the notification means may be any other means, such as a voice alarm.

If the operator notices this notification, he or she will immediately operate the HST lever 6c to slow down the machine's travelling speed, and will maintain the decelerated state until the straw in the handling chamber 51 is cleared, the machine returns to normal, and the clog sensor 70 no longer detects the clog. Once the clog sensor 70 no longer detects the clog, the operator will operate the HST lever 6c to return the machine to its original travelling speed and continue harvesting.

If the pilot does not notice the alert and the clog sensor 70 detects a clog for more than two consecutive seconds, the control device 6f automatically operates the actuator of the HST lever 6c to slow down the aircraft's forward speed by a predetermined amount (e.g., 10% deceleration).

If the clog sensor 70 detects a clog for four or more consecutive seconds despite the above-mentioned deceleration, the control device 6f automatically operates the actuator of the HST lever 6c to decelerate the aircraft's travel speed by a further predetermined amount (e.g., 20% deceleration).

If the clog sensor 70 detects a clog for 5 or more consecutive seconds despite the further deceleration to the specified speed, the control device 6f turns off the prime mover start switch 6b to stop the prime mover (engine).

After stopping the prime mover, the control device 6f turns off the reaping/threshing clutch lever 6e and does not start the prime mover even if the prime mover start switch 6b is turned on unless the HST lever 6c is in neutral. The reaping/threshing clutch lever 6e and the HST lever 6c are each provided with a position sensor that outputs their respective operating positions to the control device 6f.

Therefore, unless the reaping/threshing clutch lever 6e is turned off and the HST lever 6c is in neutral, the prime mover will not restart even if the prime mover start switch 6b is turned on, ensuring safety and preventing damage or injury due to sudden operation.

In addition, when the HST lever 6c is operated by an actuator to automatically decelerate the traveling speed of the aircraft to a predetermined speed, or when the HST lever 6c is operated by an actuator to automatically decelerate the traveling speed of the aircraft to a further predetermined speed, if the clog sensor 70 does not detect a clog for two seconds or more after the clog detection is cleared, the control device 6f automatically operates the HST lever 6c by an actuator to return the speed to the speed before deceleration.

In summary, a pressure-sensitive jam sensor 70 is provided at the entrance side of the handling chamber 51 (the first half of the handling chamber 51) above the part where the handling teeth 52 move from bottom to top as the handling drum 53 rotates in the direction of arrow A, detecting when the stalks have become stuck and are causing a jam. This means that it is possible to detect when the stalks have become stuck and are causing a jam at an early stage at the entrance side of the handling chamber 51 (the first half of the handling chamber 51), and the part above where the handling teeth 52 move from bottom to top is where the stalks are lifted up and accumulate, so the pressure is high and it can be detected appropriately.

In addition, the dead space above the part where the handling teeth 52 move from bottom to top can be used to place the clogging sensor 70, making the configuration simpler.

When the jam sensor 70 detects a jam, the control device 6f sounds the alarm buzzer 6h of the driving unit 6 and/or turns on the warning lamp on the monitor 6g to notify the operator of the occurrence of a jam, so that the operator can immediately take action to clear the jam, such as operating the HST lever 6c to slow down the machine's forward speed.

Even if the pilot neglects to operate the HST lever 6c to clear the blockage, such as slowing down the aircraft's travel speed, if the blockage sensor 70 continues to detect a blockage for a predetermined period of time or longer, the control device 6f will automatically slow down the HST lever 6c using an actuator to gradually slow down the aircraft's travel speed to a predetermined speed, so that the blockage is automatically cleared.

Furthermore, if the clog sensor 70 continues to detect a clog for a predetermined period of time or more even after automatic deceleration, the control device 6f turns off the prime mover start switch 6b to stop the prime mover (engine), thereby preventing a clog and preventing the handling drum 53 from becoming unable to rotate and being damaged, or damage to the transmission unit.

＜Teeth handling＞
The stalks are threshed as they move from the entrance to the exit of the threshing chamber 51, and from the middle position onwards, there are almost no husks attached to them. However, in the past, the threshing teeth 52 were set at the same pitch from the entrance to the exit of the threshing chamber 51, so horsepower was wasted threshing straw without husks, and when threshing high-yielding stalks, there was insufficient horsepower, making it impossible to perform proper threshing.

Therefore, for the threshing teeth support member 54 with the threshing teeth 52 attached to the threshing drum 53, multiple patterns of threshing teeth support member 54 with different arrangements of the threshing teeth 52 are prepared, and by combining threshing teeth support members 54 with different threshing tooth patterns, it is possible to improve threshing accuracy and reduce horsepower waste.

In other words, six different patterns of the tooth support member 54 shown in Figures 6(A) to 6(F) will be prepared.

(A) The teeth 52 are arranged at a wide pitch on the teeth support member 54.

(B) The teeth 52 are arranged at a narrow pitch on the teeth support member 54.

(C) The teeth 52 are arranged on the teeth support member 54 with a narrow pitch on the inlet side and a wide pitch on the outlet side.

(D) The teeth 52 on the teeth support member 54 are arranged with a narrow pitch on the inlet and outlet sides and a wide pitch in the middle position.

(E) The teeth 52 on the teeth support member 54 are arranged with a wide pitch on the inlet and outlet sides and a narrow pitch in the middle position.

In (F), the teeth 52 are provided on the teeth support member 54 at a wide pitch on the inlet side and at a narrow pitch on the outlet side.
Combination example 1 of the treatment tooth support member 54
Six handling tooth support members 54 are provided at equal intervals around the threshing drum 53, and three handling tooth support members 54 (C) in which the handling teeth 52 are arranged at a narrow pitch on the inlet side and a wide pitch on the outlet side and three handling tooth support members 54 (B) in which the handling teeth 52 are arranged at a narrow pitch are alternately arranged or attached at an appropriate position.

Therefore, the narrow-pitch threshing teeth 52 at the entrance side of the threshing chamber 51 efficiently thresh the stalks, and the wider-pitch threshing teeth 52 at the exit side from the central position where threshing is almost complete reduce the load, improving threshing accuracy and reducing horsepower waste, resulting in good threshing performance.
Combination example 2 of the treatment tooth support member 54
Six handling tooth support members 54 are provided at equal intervals around the circumferential direction of the handling drum 53, and six handling tooth support members 54 are attached in which the handling teeth 52 of (D) are arranged at a narrow pitch on the inlet and outlet sides and at a wide pitch in the middle position.
Combination example 3 of the treatment tooth support member 54
Six handling tooth support members 54 are provided at equal intervals around the threshing drum 53, and six handling tooth support members 54 are attached in which the handling teeth 52 of (C) are arranged at a narrow pitch on the inlet side and a wide pitch on the outlet side.
Combination example 4 of the treatment tooth support member 54
Six handling tooth support members 54 are provided at equal intervals around the threshing drum 53, and three handling tooth support members 54 (C) in which the handling teeth 52 are arranged at a narrow pitch on the inlet side and a wide pitch on the outlet side and three handling tooth support members 54 (A) in which the handling teeth 52 are arranged at a wide pitch are arranged alternately or are installed at appropriate positions.
Combination example 5 of the treatment tooth support member 54
Six handling tooth support members 54 are provided at equal intervals around the threshing drum 53, and three handling tooth support members 54 (C) in which the handling teeth 52 are arranged at a narrow pitch on the inlet side and a wide pitch on the outlet side, and three handling tooth support members 54 (F) in which the handling teeth 52 are arranged at a wide pitch on the inlet side and a narrow pitch on the outlet side are alternately arranged or attached at an appropriate position.
Combination example 6 of the treatment tooth support member 54
Six handling tooth support members 54 are provided at equal intervals around the threshing drum 53, and three handling tooth support members 54 (C) in which the handling teeth 52 are arranged at a narrow pitch on the inlet side and a wide pitch on the outlet side, and three handling tooth support members 54 (E) in which the handling teeth 52 are arranged at a wide pitch on the inlet and outlet sides and a narrow pitch in the middle position are alternately arranged or attached at an appropriate position.
Combination example 7 of the treatment tooth support member 54
Six handling tooth support members 54 are provided at equal intervals around the circumferential direction of the handling drum 53, and three handling tooth support members 54 (C) in which the handling teeth 52 are arranged at a narrow pitch on the inlet side and a wide pitch on the outlet side, and three handling tooth support members 54 (D) in which the handling teeth 52 are arranged at a narrow pitch on the inlet and outlet sides and a wide pitch in the middle position are alternately arranged or attached at an appropriate position.
Combination example 8 of the treatment tooth support member 54
Six handling tooth support members 54 are provided at equal intervals around the threshing drum 53, and two handling tooth support members 54 (C) in which the handling teeth 52 are arranged at a narrow pitch on the inlet side and a wide pitch on the outlet side, and four handling tooth support members 54 (B) in which the handling teeth 52 are arranged at a narrow pitch are attached in appropriate positions.
Combination example 9 of the treatment tooth support member 54
Six handling tooth support members 54 are provided at equal intervals around the threshing drum 53, and two handling tooth support members 54 (C) in which the handling teeth 52 are arranged at a narrow pitch on the inlet side and a wide pitch on the outlet side, and four handling tooth support members 54 (F) in which the handling teeth 52 are arranged at a wide pitch on the inlet side and a narrow pitch on the outlet side are attached in appropriate positions.
Combination example 10 of the treatment tooth support member 54
To provide six handling tooth support members 54 at equal intervals around the circumferential direction of the handling drum 53, two handling tooth support members 54 (C) in which the handling teeth 52 are arranged at a narrow pitch on the inlet side and a wide pitch on the outlet side, and four handling tooth support members 54 (E) in which the handling teeth 52 are arranged at a wide pitch on the inlet and outlet sides and a narrow pitch in the middle position are attached in appropriate positions.
Combination example 11 of the treatment tooth support member 54
Six handling tooth support members 54 are provided at equal intervals around the threshing drum 53, and two handling tooth support members 54 (C) in which the handling teeth 52 are arranged at a narrow pitch on the inlet side and a wide pitch on the outlet side, and four handling tooth support members 54 (D) in which the handling teeth 52 are arranged at a narrow pitch on the inlet and outlet sides and a wide pitch in the middle position are attached in appropriate positions.
Combination example 12 of the treatment tooth support member 54
Six handling tooth support members 54 are provided at equal intervals around the threshing drum 53, and two handling tooth support members 54 (C) in which the handling teeth 52 are arranged at a narrow pitch on the inlet side and a wide pitch on the outlet side, and four handling tooth support members 54 (A) in which the handling teeth 52 are arranged at a wide pitch are attached in appropriate positions.

<Another embodiment>
(1) In the above embodiment 1, when the clogging sensor 70 detects a clogging for a predetermined period of time or longer, the control device 6f automatically decelerates the HST lever 6c using an actuator to decelerate the traveling speed of the machine to a predetermined speed and clear the clogging. However, in embodiment 2, the position of the dust feed guide 80 may be changed to control the amount of dust fed and clear the clogging.

In other words, the dust guide 80 is configured so that its angle can be changed by the dust guide angle change actuator, and when the clogging sensor 70 detects a clogging for a predetermined period of time or longer, the control device 6f operates the dust guide angle change actuator to open the dust guide 80 (the angle becomes gentler in the feeding direction), adjusting the action of sending the straw, straw chips, etc. in the handling chamber 51 to the outlet side to strengthen the clogging, thereby eliminating the clogging.

In more detail, when the jam sensor 70 detects a jam for one or more consecutive seconds, the control device 6f sounds the alarm buzzer 6h of the driving unit 6 and/or turns on the warning lamp of the monitor 6g to notify the operator of the occurrence of a jam. Note that the notification may be any other method, such as a voice alarm.

If the operator notices this notification, he or she manually operates the dust guide angle change actuator to open the dust guide 80 (the angle becomes gentler in the feed direction), adjusting it so that the action of sending the straw, straw chips, etc. in the handling chamber 51 to the outlet side is stronger, thereby clearing the blockage, and once the blockage detection by the blockage sensor 70 is cleared, he or she manually operates the dust guide angle change actuator to return the dust guide 80 to its original angle and continue harvesting operations.

If the operator does not notice the alert and the clogging sensor 70 detects a clogging for more than two consecutive seconds, the control device 6f will operate the dust guide angle change actuator to open the dust guide 80 by a specified angle (the angle in the feed direction becomes gentler by a specified angle) and adjust the action of sending the straw, straw chips, etc. in the handling chamber 51 to the exit side more strongly.

If the clogging sensor 70 detects a clogging for four or more consecutive seconds despite the dust guide 80 being opened to a specified angle, the control device 6f will operate the dust guide angle change actuator to open the dust guide 80 to a further specified angle (the angle in the feed direction will become further looser by a specified angle) and adjust the action of sending the straw, straw chips, etc. in the handling chamber 51 to the outlet side to be even stronger.

If the clogging sensor 70 detects a clogging for 5 or more consecutive seconds despite the dust guide 80 being opened further to a specified angle, the control device 6f turns off the prime mover start switch 6b to stop the prime mover (engine).

After stopping the prime mover, the control device 6f turns off the reaping/threshing clutch lever 6e and puts the HST lever 6c in neutral, otherwise the prime mover will not start even if the prime mover start switch 6b is turned on.

In addition, when the dust transport guide angle change actuator is operated to open the dust transport guide 80 to a predetermined angle, or when the dust transport guide angle change actuator is operated to open the dust transport guide 80 further to a predetermined angle, if the clog sensor 70 detects no clog for more than two seconds after the clog sensor 70 detects no clog, the control device 6f operates the dust transport guide angle change actuator to return the dust transport guide 80 to its original angle.

(2) When the clogging sensor 70 of embodiment 1 detects a clogging for a predetermined period of time or longer, the control device 6f may use an actuator to automatically decelerate the HST lever 6c to reduce the traveling speed of the machine by a predetermined speed to clear the clogging, and may also use the same means as the dust feed guide 80 of embodiment 2 to change its position to control the amount of dust fed to clear the clogging.

(3) In the first and second embodiments, the jam sensor 70 is provided at an upper position on the inlet side of the handling chamber 51 (the front half of the handling chamber 51) where the handling teeth 52 move from bottom to top. However, as shown in FIG. 4, the jam sensor 70 may be provided at a position (the apex) where the handling teeth 52 move from bottom to top and then change to a downward movement. The jam sensor 70 is provided on the upper handling drum cover 50c.

Also, as shown in FIG. 5, a jam sensor 70 may be provided above the part where the handling teeth 52 move downward. The jam sensor 70 is provided on the upper handling drum cover 50c.

2 Traveling device 4 Harvesting unit 5 Threshing device 6g Notification means (monitor)
6h Notification means (alarm buzzer)
51 Handling chamber 52 Handling teeth 53 Handling drum 70 Jam sensor

Claims (2)

In a combine harvester provided with a threshing device (5) for threshing the harvested crop by a reaping section (4) provided at the front of a machine body moving forward by a traveling device (2), a threshing drum (53) having threshing teeth (52) is driven to rotate in a threshing chamber (51) of the threshing device (5), and a jamming sensor (70) for detecting jamming of the harvested crop is provided above a portion where the threshing teeth (52) move from bottom to top in the first half of the threshing process in which the harvested crop moves from the entrance side of the threshing chamber (51) to the exit side ,
A combine harvester characterized in that the forward speed of the machine body is gradually reduced by a predetermined amount each time a clogging detection by a clogging sensor (70) continues for a predetermined period of time or more . In a combine harvester provided with a threshing device (5) for threshing the harvested crop by a reaping section (4) provided at the front of a machine body moving forward by a traveling device (2), a threshing drum (53) having threshing teeth (52) is driven to rotate in a threshing chamber (51) of the threshing device (5), and a jamming sensor (70) for detecting jamming of the harvested crop is provided above a portion where the threshing teeth (52) move from bottom to top in the first half of the threshing process in which the harvested crop moves from the entrance side of the threshing chamber (51) to the exit side ,
A combine harvester characterized in that, when the detection of a clogging by a clogging sensor (70) continues for a predetermined period of time or longer, the prime mover is stopped.