Combine harvester

Abstract

To solve a problem that a machine body is sometimes broken when the machine body is retreated in a state in which a case is brought into contact with a field surface in headland reaping or the like because of a conventional constitution for detecting reaping height by vertically rotating a rear part.SOLUTION: In a combine harvester in which a reaping device 4 is constituted by having a plurality of grass dividers 7, a raising device 8 and a reaping blade 10 and a reaping height detecting device 30 is provided at a prescribed position of the reaping device 4, the reaping height detecting device 30 is constituted so as to detect the reaping height of the reaping device 4 by vertical rotation of a case 32 attached to the side of the grass divider 7 by a front side attaching shaft 33 in the lateral direction so as to be freely rotated in the lateral direction. This combine harvester is constituted so as to regulate the retreating operation by a main speed change lever 13 of a traveling device 2 when a reaping vertical position detection part 12 detects the reaping operation state of a reaping device 4 and a reaping height detection device 30 detects the field grounding of the reaping device 4.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a combine harvester. [Background technology]

[0002] Conventionally, in a mowing device that automatically controls the mowing height to position it at a predetermined height using a mowing height detection device installed at a predetermined position, a configuration is known in which the mowing height detection device rotatably attaches a contact body to the front of the case via a front axis, and the rear of the case is rotatably attached to a bracket via a rear axis, and the mowing height of the mowing device is controlled using the up and down movement of the case (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-0805111 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned known device detects the cutting height by rotating the rear part up and down around the front mounting axis attached to the grass body side of the case, so there is a problem that if the machine is retracted while the case is in contact with the field surface when cutting headland, etc., the case may be damaged. The present invention aims to prevent damage to the cutting height detection device while improving operability and workability. [Means for solving the problem]

[0005] The invention described in claim 1 is a combine harvester in which a threshing device 3 is provided above a traveling device 2, and a reaping device 4 is provided in front of the threshing device 3, and the reaping device 4 is configured to have a plurality of grass dividing devices 7 that divide the stalks in the field, a raising device 8 that raises the divided stalks, and a cutting blade 10 that cuts the base of the raised stalks, and in which a cutting height detection device 30 that detects the height of the reaping device 4 from the ground is provided at a predetermined position on the reaping device 4, the cutting height detection device 30 is connected to the grass dividing device 7 by a front mounting shaft 33 in the left-right direction. The combine harvester is configured to detect the cutting height of the cutting device 4 by the vertical rotation of a case 32 attached to the side of the combine harvester so that it can rotate freely on a horizontal axis, and a cutting vertical position detection unit 12 is provided between the cutting device 4 and the machine body side to detect the vertical position of the cutting device 4 relative to the machine body side, and when the cutting vertical position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, the combine harvester is configured to restrict reverse operation by the main speed change lever 13 of the traveling device 2. The invention described in claim 2 is a combine harvester in which a threshing device 3 is provided above a traveling device 2, and a reaping device 4 is provided in front of the threshing device 3, and the reaping device 4 is configured to have a plurality of arranging grass dividing devices 7 arranged in a left-right direction to divide the stalks in the field, a raising device 8 to raise the divided stalks, and a cutting blade 10 to cut the base of the raised stalks, and a cutting height detecting device 30 to detect the height of the reaping device 4 relative to the field surface is provided at a predetermined position of the reaping device 4, and the cutting height detecting device 30 is separated by a front mounting shaft 33 in the left-right direction. The combine harvester is configured to detect the cutting height of the cutting device 4 by the vertical rotation of a case 32 attached to the grass device 7 side so that it can rotate freely on a horizontal axis, and a cutting vertical position detection unit 12 is provided between the cutting device 4 and the machine body side to detect the vertical position of the cutting device 4 relative to the machine body side, and when the cutting vertical position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, an alarm means 16 provided at a predetermined position on the machine body sounds a warning sound if the machine moves backward. The invention described in claim 3 is a combine harvester in which a threshing device 3 is provided above a traveling device 2, and a reaping device 4 is provided in front of the threshing device 3, and the reaping device 4 is configured to have a plurality of grazing devices 7 arranged side by side in the left-right direction to grazing the stalks in the field, a raising device 8 to raise the grazing stalks, and a cutting blade 10 to cut the base of the raised stalks, and in which a cutting height detection device 30 to detect the height of the reaping device 4 relative to the field surface is provided at a predetermined position on the reaping device 4, the cutting height detection device 30 is attached to a front mounting shaft 3 in the left-right direction. The combine harvester is configured to detect the cutting height of the cutting device 4 by the up and down rotation of a case 32 attached to the grass dividing device 7 side so that it can rotate freely on a horizontal axis by means of 3, and a cutting vertical position detection unit 12 is provided between the cutting device 4 and the machine body side to detect the vertical position of the cutting device 4 relative to the machine body side, and when the cutting vertical position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, the combine harvester is configured to automatically raise the cutting device 4 when the machine body moves backward. The invention described in claim 4 is a combine harvester configured to display a warning message on the monitor 14 provided on the operating section 6 when the reverse operation of the main speed change lever 13 is restricted. The invention described in claim 5 is a combine harvester configured to activate an alarm means 16 to emit a warning sound when an attempt is made to operate the main shift lever 13 in reverse while the control unit 15 is restricting operation of the main shift lever 13. The invention described in claim 6 is a combine harvester configured to display a warning message on the monitor 14 provided on the operating unit 6 when the reaping device 4 is automatically raised. The invention described in claim 7 is a combine harvester configured such that when the reaping device 4 is automatically controlled to rise, the notification means 16 is activated to emit a warning sound when the machine body is moved backward. [Effects of the Invention]

[0006] In the invention of claim 1, when the cutting vertical position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the ground in the field, the reverse operation using the main shift lever 13 of the traveling device 2 is restricted (locked).Therefore, by doubly detecting the lowered state of the cutting device 4 by the cutting vertical position detection unit 12 and the cutting height detection device 30, unintentional reverse movement of the machine is avoided and damage or malfunction of the cutting height detection device 30 is prevented. In the invention of claim 2, when the cutting vertical position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, the alarm means 16 installed at a predetermined position on the machine body sounds a warning sound when the machine body moves backward.Therefore, the lowered state of the cutting device 4 is doubly detected by the cutting vertical position detection unit 12 and the cutting height detection device 30, and the alarm means 16 sounds a warning sound, thereby avoiding unintended backward movement of the machine body and preventing damage or malfunction of the cutting height detection device 30. In the invention described in claim 3, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, the cutting device 4 is automatically raised when the machine moves backward.Therefore, when the machine moves backward, the cutting device 4 is automatically raised, which prevents the cutting height detection device 30 from breaking down when the machine moves backward with the cutting device 4 lowered. In the invention of claim 4, when the reverse operation of the main shift lever 13 is restricted, a warning message is displayed on the monitor 14 provided on the control unit 6. Therefore, by doubly detecting the lowered state of the mowing device 4 by the mowing up / down position detection unit 12 and the mowing height detection device 30, unintentional reverse movement of the machine is avoided, preventing damage or malfunction of the mowing height detection device 30, and also making the operator aware that the operation of the main shift lever 13 is being restricted, improving operability. In the invention of claim 5, when the control unit 15 is restricting the operation of the main speed change lever 13 and the operator attempts to operate the main speed change lever 13 in reverse, the notification means 16 is activated to emit a warning sound. This prevents damage or malfunction of the cutting height detection device 30 and also ensures that the operator is aware that the operation of the main speed change lever 13 is restricted by the warning sound from the notification means 16, thereby improving operability. In the invention of claim 6, when the mowing device 4 is automatically controlled to rise, a warning message is displayed on the monitor 14 provided on the operating unit 6, thereby preventing damage or malfunction of the mowing height detection device 30 and ensuring that the operator is aware that the operation of the main speed change lever 13 is restricted by the warning message on the monitor 14, thereby improving operability. In the invention of claim 7, when the cutting device 4 is automatically controlled to rise, the alarm means 16 is activated to emit a warning sound when the machine body is moved backward, thereby preventing damage or malfunction of the cutting height detection device 30 and ensuring that the operator is aware that the main speed change lever 13 is under operation restriction through the warning sound from the alarm means 16, thereby improving operability. [Brief explanation of the drawings]

[0007] [Figure 1] Side view of a combine harvester. [Figure 2] A side view of the vicinity of the grass dividing device of the harvesting device. [Figure 3] The same front view. [Figure 4] A side view of the vicinity of the grass dividing device of the harvesting device. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] Block diagram. DETAILED DESCRIPTION OF THE INVENTION

[0008] One embodiment of the present invention is explained with reference to the drawings, in which 1 is the machine frame, 2 is the running gear, 3 is the threshing device located above the running gear 2, 4 is the reaping device, 5 is the grain tank located on the side of the threshing device 3, and 6 is the control unit. The harvesting device 4 is composed of a plurality of grass dividing devices 7 arranged at intervals in the left-right direction, and a plurality of lifting devices 8 provided behind each grass dividing device 7. Provided behind the lifting devices 8 are a cutting blade 10 that cuts the base of the culm and a culm transport device that transports the harvested culm. The cutting device 4 is configured so that the tip of a vertical support frame 21 is attached to the cutting frame 20 of the cutting device 4, and the base of the vertical support frame 21 is rotatably attached to a support base (not shown) provided on the body frame 1 side, and can be freely moved up and down by a cutting up and down cylinder 22. The reaping device 4 performs reaping work by automatically controlling the reaping height using a reaping height detection device 30 provided on the reaping device 4 so that the reaping height is positioned at a predetermined height.

[0009] The configuration of the cutting height detection device 30 is arbitrary, but as an example, the front side of the case 32 is attached to the grass dividing device 7 side by a front mounting shaft (first shaft) 33 in the left-right direction so that it can rotate freely up and down, and the base of the contact body 50 is attached to the rear of the case 32 by a rear mounting shaft (second shaft) 46 in the left-right direction so that it can rotate freely, and the cutting height of the cutting device 4 is detected by the contact position of the contact body 50 with the field. In this configuration, in which the rear of the case 32 is raised and lowered to detect the height of the cutting device 4 relative to the field, if the cutting height detection device 30 is installed in the field when cutting headland, etc., and the machine is then carelessly reversed, the cutting height detection device 30 may be damaged.

[0010] In the present invention, a threshing device 3 is provided above a traveling device 2, and a reaping device 4 is provided in front of the threshing device 3, and the reaping device 4 is configured to have a plurality of arranging grass dividing devices 7 arranged in a left-right direction to divide the stalks in the field, a raising device 8 to raise the divided stalks, and a cutting blade 10 to cut the base of the raised stalks, and in the combine harvester in which a cutting height detection device 30 to detect the height of the reaping device 4 relative to the field surface is provided at a predetermined position on the reaping device 4, the cutting height detection device 30 is attached to a front mounting shaft 33 in the left-right direction. The cutting height of the cutting device 4 is detected by the up and down rotation of a case 32 which is attached so that it can rotate freely on a horizontal axis on the grass dividing device 7 side, and a cutting up / down position detection unit 12 which detects the up and down position of the cutting device 4 relative to the machine body side is provided between the cutting device 4 and the machine body side, and the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and when the cutting height detection device 30 detects that the cutting device 4 has touched the field, the reverse operation by the main shift lever 13 of the traveling device 2 is restricted (locked).

[0011] Therefore, by doubly detecting the state in which the mowing device 4 is lowered by the mowing up / down position detection unit 12 and the mowing height detection device 30, unintentional backward movement of the machine body is avoided and damage or malfunction of the mowing height detection device 30 is prevented. The reaping vertical position detection unit 12 is configured to detect the reaping vertical position using a reaping vertical position sensor 12A provided on a support base (not shown) on the machine frame 1 side to which the base of the vertical support frame 21 is attached (Fig. 1). In this embodiment, the reverse operation of the main speed change lever 13 is detected by a main speed change lever sensor 13A that detects the operation position of the main speed change lever 13. When the reverse operation of the main speed change lever 13 is restricted, a warning message is displayed on the monitor 14 provided on the operation unit 6. Therefore, by doubly detecting the state in which the mowing device 4 is lowered by the mowing up / down position detection unit 12 and the mowing height detection device 30, unintentional backward movement of the machine body is avoided, and damage or malfunction of the mowing height detection device 30 is prevented, and the operator is made aware that operation of the main shift lever 13 is restricted, thereby improving operability.

[0012] Furthermore, if an attempt is made to operate the main speed change lever 13 in reverse while the control unit (control device) 15 is restricting the operation of the main speed change lever 13, the notification means 16 is activated to emit a warning sound. In other words, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the ground in the field, the control unit (control device) 15 is configured to restrict (lock) the reverse operation of the main shift lever 13 itself. This allows the operator to be sure that the operation of the main shift lever 13 is restricted, thereby improving operability.

[0013] The reverse operation of the main speed change lever 13 is detected by a main speed change lever sensor 13A. Further, the present invention provides a combine harvester in which a threshing device 3 is provided above a traveling device 2, and a reaping device 4 is provided in front of the threshing device 3, and the reaping device 4 is configured to have a plurality of arranging grass dividing devices 7 arranged in a left-right direction to divide the stalks in the field, a raising device 8 to raise the divided stalks, and a cutting blade 10 to cut the base of the raised stalks, and a cutting height detecting device 30 to detect the height of the reaping device 4 relative to the field surface is provided at a predetermined position on the reaping device 4, and the cutting height detecting device 30 is attached to a front mounting shaft 3 in the left-right direction. The cutting height of the cutting device 4 is detected by the up and down rotation of a case 32 attached to the grass dividing device 7 side so that it can rotate freely on a horizontal axis by means of 3, and a cutting up / down position detection unit 12 is provided between the cutting device 4 and the machine body side to detect the up and down position of the cutting device 4 relative to the machine body side, and when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, an alarm means 16 provided at a predetermined position on the machine body sounds a warning sound if the machine moves backward.

[0014] Therefore, the state in which the cutting device 4 is lowered is doubly detected by the cutting up / down position detection unit 12 and the cutting height detection device 30, and the alarm means 16 sounds a warning sound, thereby avoiding unintended backward movement of the machine body and preventing damage or malfunction of the cutting height detection device 30. When the vertical cutting position detector 12 and the cutting height detector 30 detect that the cutting device 4 is lowered, a warning message is displayed on the monitor 14 of the operating unit 6. Therefore, by doubly detecting the state in which the mowing device 4 is lowered by the mowing up / down position detection unit 12 and the mowing height detection device 30, unintentional backward movement of the machine is avoided, and damage or malfunction of the mowing height detection device 30 is prevented, and the operator can visually recognize the state of the machine, improving operability. In this case, the monitor 14 displays a warning message and / or the notification means 16 sounds a warning sound without requiring the main shift lever 13 to restrict reverse operation, but the main shift lever 13 may require the main shift lever 13 to restrict reverse operation.

[0015] Further, the present invention provides a combine harvester in which a threshing device 3 is provided above a traveling device 2, and a reaping device 4 is provided in front of the threshing device 3, and the reaping device 4 is configured to have a plurality of threshing devices 7 arranged side by side in the left-right direction to thresh the stalks in the field, a raising device 8 to raise the stalks, and a cutting blade 10 to cut the base of the raised stalks, and a cutting height detection device 30 to detect the height of the reaping device 4 relative to the field surface is provided at a predetermined position of the reaping device 4, and the cutting height detection device 30 is provided in front of the left-right direction. The cutting height of the cutting device 4 is detected by the up and down rotation of the case 32 which is attached to the grass dividing device 7 side so that it can rotate freely on its horizontal axis by a side mounting shaft 33, and a cutting up / down position detection unit 12 which detects the up and down position of the cutting device 4 relative to the machine body side is provided between the cutting device 4 and the machine body side, and when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, the cutting device 4 is automatically raised when the machine body moves backward.

[0016] Therefore, when the machine body is moved backward, the reaping device 4 is automatically raised, which prevents the machine body from moving backward with the reaping device 4 lowered and causing the cutting height detection device 30 to malfunction. When the cutting vertical position detector 12 and the cutting height detector 30 detect that the cutting device 4 is lowered, if the machine moves backward, the alarm means 16 sounds an alarm and a warning message is displayed on the monitor. In other words, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, the cutting device 4 is automatically raised when the machine moves backwards.However, if the operator does not notice that the cutting device 4 is automatically raised, inconvenience may arise, so the operator is notified of this by the notification means 16 and a warning message is displayed on the monitor 14. In other words, even though the operator has set the desired cutting height, the automatic cutting lift control causes the cutting device 4 to rise without the operator noticing, and if the operator unconsciously resumes cutting work, the cutting will end up being done at a high height.Therefore, the system is designed to alert the operator to any unintended automatic cutting lift operation. This prevents damage or malfunction of the cutting height detection device 30 and allows the operator to audibly and visually confirm the control status of the machine.

[0017] In addition, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, if the machine moves backward, the alarm means 16 may sound an alarm and automatic control may be performed to automatically raise the cutting device 4. Therefore, the operator can confirm the retreating state of the machine body by the notification means 16, and damage or malfunction of the cutting height detection device 30 can be prevented. In this case, the method for detecting the reverse movement of the vehicle body is arbitrary, but in this embodiment, it is detected by the output rotation speed of the HST transmission unit 17 of the continuously variable transmission (HST, not shown) of the traveling device 2. In addition, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the ground in the field, if the machine moves backward, a warning message may be displayed on the monitor 14 and automatic control may be performed to automatically raise the cutting device 4. Therefore, the operator can check on the monitor 14 whether the automatic lift control of the reaping device 4 is being executed, and damage or malfunction of the reaping height detection device 30 is prevented. In addition, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, if the machine moves backward, the alarm means 16 will sound an alarm, a warning message will be displayed on the monitor 14, and automatic cutting lift control may be executed to automatically lift the cutting device 4.

[0018] Therefore, the operator can confirm the execution of automatic lift control of the reaping device 4 by using the monitor 14 and the notification means 16, thereby preventing damage or malfunction of the reaping height detection device 30. In addition, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the ground in the field, if the main shift lever 13 is moved to the reverse position, the alarm means 16 may be configured to sound a warning sound. Therefore, when the cutting height detection device 30 detects the ground contact state of the cutting device 4, the notification means 16 notifies the operator of the operating status of the machine in reverse using the main shift lever 13, thereby preventing damage or malfunction of the cutting height detection device 30. In addition, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the ground in the field, if the main shift lever 13 is moved to the reverse position, a warning message may be displayed on the monitor 14.

[0019] Therefore, when the cutting height detection device 30 detects the ground contact state of the cutting device 4, the monitor 14 displays to the operator the operating status of the machine moving backward using the main shift lever 13, thereby preventing damage or malfunction of the cutting height detection device 30. In addition, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the ground in the field, if the main shift lever 13 is moved to the reverse position, automatic cutting lift control may be executed to automatically lift the cutting device 4. Therefore, when the cutting height detection device 30 detects that the cutting device 4 is in contact with the ground, if the operator operates the main speed change lever 13 to move the machine backward, automatic cutting lift control is executed, thereby preventing damage or malfunction of the cutting height detection device 30.

[0020] In addition, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, if the main shift lever 13 is moved to the reverse position, the alarm means 16 may sound an alarm and the monitor 14 may display a warning message. Therefore, when the cutting height detection device 30 detects the ground contact state of the cutting device 4, the monitor 14 and the notification means 16 notify the operator of the operating status of the machine in reverse using the main shift lever 13, thereby preventing damage or malfunction of the cutting height detection device 30. In addition, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, if the main shift lever 13 is moved to the reverse position, the alarm means 16 may sound a warning and automatic cutting lift control may be executed.

[0021] Therefore, when the cutting height detection device 30 detects the grounding state of the cutting device 4, the operator is notified by the notification means 16 of the operating status in which the machine is being operated in reverse using the main shift lever 13, and automatic cutting lift control is executed, thereby preventing damage or malfunction of the cutting height detection device 30. In addition, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the ground in the field, if the main shift lever 13 is moved to the reverse position, a warning message may be displayed on the monitor 14 and automatic cutting lift control may be executed. Therefore, when the cutting height detection device 30 detects the grounding state of the cutting device 4, a warning message is displayed on the monitor 14 to inform the operator of the operating status of the machine moving backward using the main shift lever 13, and automatic cutting lift control is executed, thereby preventing damage or malfunction of the cutting height detection device 30.

[0022] In addition, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, if the main shift lever 13 is moved to the reverse position, the alarm means 16 will sound an alarm, the monitor 14 will display a warning message, and automatic cutting lift control will be executed. Therefore, when the cutting height detection device 30 detects that the cutting device 4 is in the ground, the operator is informed of the operating status of the machine in reverse using the main shift lever 13 by a warning sound from the notification means 16 and a warning message on the monitor 14, and automatic cutting lift control is executed, thereby preventing damage or malfunction of the cutting height detection device 30. To show an example of the cutting height detection device 30 in detail, the front part of the case 32 is rotatably attached to a bracket 35 provided on the grass dividing device 7 side by a front left-right mounting shaft 33. The bracket 35 is composed of an attachment part 36 attached to the cutting device 4 side, and a deformation part 37 formed from an elastic member that allows the attachment part 36 to move at least laterally (left-right) due to forces received from outside the machine.

[0023] That is, as shown in Figure 6, the tip of the front-to-rear grass dividing rod 40, whose base is attached to the side of the cutting frame 20 on which the grass dividing device 7 is attached, is bent upward to form a bent portion 41, and a space 42 is formed between the underside (front surface) of the bent portion 41 and the field surface, and the cutting height detection device 30 is positioned within the space 42. The mounting portion 36 of the bracket 35 is fixedly attached to the grass dividing device 7 located in the front part of the space 42, the front mounting shaft (first shaft) 33 is fixedly provided to the mounting portion 36, and the shaft tube 34 of the case 32 is attached to the front mounting shaft 33 so as to be freely rotatable (rotatable). A rear mounting shaft (second shaft) 46 is provided in the rear of the case 32, and the base of a contact body 50 protruding rearward is rotatably attached to the rear mounting shaft 46 (FIGS. 6 and 7).

[0024] The contact body 50 has an attachment portion 56 at the front (upper) portion of a contact portion 55 formed from a plate member in the front-to-rear direction, and the attachment portion 56 is fixed to the rear attachment shaft 46, which is attached to the case 32 so as to be freely rotatable. The contact body 50 is configured so as to rotate clockwise in the drawing but not counterclockwise. That is, a stopper 43 is fixed to the rear mounting shaft 46 of the contact body 50, and the contact portion 55 of the stopper 43 always abuts against a predetermined portion of the inner wall of the case 32 at a predetermined position, thereby restricting counterclockwise rotation.

[0025] Reference numeral 44 denotes a spring that urges the contact body 50 so that it always rotates upward around the rear mounting shaft 46, and a stopper 43 abuts against a predetermined portion of the inner wall of the case 32 to restrict the upward rotation of the contact body 50. A stopper 45 is fixed to the front mounting shaft 33, which is fixed to the bracket 35 side, and the stopper 45 is always in contact with an abutment portion 45A provided inside the case 32, thereby restricting downward rotation of the case 32, which is rotatably attached to the front mounting shaft 33 via the shaft tube 34. The case 32 rotates between a lowermost position where the stopper 45 abuts against the abutment portion 45A and an uppermost position where the stopper 45 abuts against the inner wall of the case 32 on the opposite side of the abutment portion 45A. Reference numeral 49 denotes a spring that constantly urges the case 32 to rotate clockwise (rotate downward), and holds the case 32 and the contact body 50 in a predetermined position.

[0026] The case 32 is provided with a detection device (potentiometer) 58 that detects the rotational position around the front mounting shaft 33 relative to the bracket 35. An arm 48 is fixed to a detection shaft 58A of the detection device 58, and the arm 48 engages with an engagement pin 47 provided on the stopper 45. The engagement pin 47 and the arm 48 that form part of the detection device 58 are provided inside the case 32 . When the tip of the contact body 50 comes into contact with the field surface while the machine body is moving forward, the cutting height detection device 30 rotates the case 32 upward together with the contact body 50 around the front mounting shaft 33 while maintaining a fixed position relative to the rear mounting shaft 46, causing the arm 48 to rotate relative to the fixed engagement pin 47, and the detection device 58 detects the rotational position of the arm 48 and sends a signal to raise the cutting device 4.

[0027] Conversely, when the tip of the contact body 50 tries to move away from the field (when rising), the elastic force of the spring 46 causes the case 32 to rotate downward around the front mounting shaft 33, and the detection device 58 detects the rotation of the arm 48 relative to the engagement pin 47 caused by the downward rotation of the case 32 and sends a signal to lower the reaping device 4, thereby performing automatic reaping height control. The upper end of the tip portion 60 is positioned above the lower end surface of the case 32 when the contact body 50 is not in contact with the field. This prevents straw chips from getting caught in the gap between the case 32 and the contact body 50. In FIG. 6, a plurality of lines are shown to facilitate understanding of the positional relationship between the contact body 50 and the field scene, but the configuration of the present invention is not limited to these. A stopper mechanism 70 that prevents the mowing height detection device 30 (case 32) from descending is provided between the case 32 of the mowing height detection device 30 and the grass dividing device 7 (Figure 2, etc.). The stopper mechanism 70 is configured with an attachment portion 71 and an engagement portion 72 that engages with the tip 60 of the contact body 50, and the tip 60 of the contact body 50 is engaged with the engagement portion 72 of the stopper mechanism 70 to hold it in the storage position.

[0028] This allows the stopper mechanism 70 to stop the descent of the cutting height detection device 30, preventing the contact body 50 of the cutting height detection device 30 from getting caught on the stalks or the like, when control by the cutting height detection device 30 is not required, such as when high cutting is performed by raising the cutting device 4 high, such as for wheat cutting. The stopper mechanism 70 is provided above the range through which the base of the culm passes. Therefore, the presence of the stopper mechanism 70 does not affect the posture of the stalks in the field. The stopper mechanism 70 is provided above the lower straight portion 40A of the grass dividing rod 40, which is parallel to the field surface (FIG. 2). This prevents the presence of the stopper mechanism 70 from affecting the position of the stalks in the field, and also prevents damage to the cutting height detection device 30 and the stopper mechanism 70. The stopper mechanism 70 is provided behind the tip 60 of the contact portion 55 of the contact body 50 of the cutting height detection device 30.

[0029] This allows the front mounting shaft 33, which is the pivot point of the cutting height detection device 30, to be positioned farther away, making it possible to reliably restrict the downward movement. The stopper mechanism 70 is provided outside the normal operating range of the tip 60 of the contact portion 55 of the contact body 50 of the cutting height detection device 30. As a result, the presence of the stopper mechanism 70 does not affect the cutting height detection device 30 during normal cutting height control. The stopper mechanism 70 is provided at a position where it can be fixed above the normal operating range of the tip 60 of the contact portion 55 of the contact body 50 of the cutting height detection device 30 . In other words, the contact body 50 can rotate clockwise around the front mounting shaft 33, but counterclockwise rotation is restricted by the stopper 43 and spring 44. Therefore, when the contact body 50 is rotated clockwise around the rear mounting shaft 46 while the cutting height detection device 30 is rotated counterclockwise, the tip 60 of the contact body 50 can pass through the tip of the engagement portion 72 of the stopper mechanism 70, causing the tip 60 of the contact body 50 to return to its original position and engage with the stopper mechanism 70.

[0030] Therefore, the stopper mechanism 70 is provided in a relative relationship between the clockwise rotation range of the contact body 50 of the cutting height detection device 30 and the height position of the stopper mechanism 70 so that the tip 60 of the contact portion 55 of the contact body 50 of the cutting height detection device 30 is positioned above the normal operating range, and the contact body 50 does not rotate counterclockwise when the contact body 50 of the cutting height detection device 30 is passed through, thereby engaging with the stopper mechanism 70. This allows the stopper mechanism 70 to hold the cutting height detection device 30 in a suitable stored position. When the contact body 50 of the cutting height detection device 30 is held and fixed by the stopper mechanism 70, the contact body 50 is positioned above the normal operating range, and when the detection device 58 detects this, the automatic control of the cutting height by the cutting height detection device 30 is disabled. This prevents false detection by the cutting height detection device 30 when cutting at high height, etc.

[0031] (Operation of the embodiment) The machine travels, the grass is divided by the grass dividing device 7, the divided culms are raised by the raising device 8, the base of the raised culms is raked in by the raking device while being cut by the cutting blade 10, the cut culms are transported by the base transport device and tip transport device of the culm transport device and handed over to the culm supply transport device, and the culm supply transport device supplies the culms to the threshing device 3 for threshing. At this time, the cutting height detection device 30 detects the vertical position of the cutting device 4 relative to the field surface, and performs automatic cutting height control to keep the cutting height constant at a predetermined height based on this detection value, thereby performing cutting work so as to improve the stalk transportation and threshing performance of the combine.

[0032] The mowing height detection device 30 is configured such that the front portion of the case 32 is rotatably attached to the mounting portion 52 of the bracket 35 by the front mounting shaft 33 in the left-right direction, a rear mounting shaft 46 in the left-right direction is provided at the rear of the case 32, and the base of the contact body 50 that protrudes rearward is rotatably attached to the rear mounting shaft 46, and a detection device 58 is provided within the case 32 which detects the rotational position of the case 32 around the front mounting shaft 33 relative to the mowing height detection device 30 bracket 35.When the contact body 50 comes into contact with the field surface, the upward rotation of the contact body 50 relative to the rear mounting shaft 46 is restricted, and the reaction force of the contact causes the case 32 to rotate upward around the front mounting shaft 33, which is detected by the detection device 58 and causes the mowing device 4 to rise.

[0033] The cutting height detection device 30 is composed of a case 32 that is tilted downward at the rear and has its rear part that can rotate freely up and down around the front mounting shaft 33.When the machine body is moving forward, the rear part of the case 32 comes into contact with the field surface and moves up and down to detect the ground contact state of the cutting device 4. A cutting vertical position detection unit 12 is provided between the cutting device 4 and the machine body side to detect the vertical position of the cutting device 4 relative to the machine body side, and the cutting vertical position detection unit 12 detects the cutting operation status of the cutting device 4, and the cutting height detection device 30 detects when the cutting device 4 touches the ground in the field. Therefore, if the machine body is moved backward while the contact body 50 of the case 32 of the cutting height detection device 30 is in contact with the field, there is a risk that the case 32 and the contact body 50 will be damaged.

[0034] In the present invention, the mowing device 4 is provided with a mowing height detection device 30 that detects the mowing height of the mowing device 4, and a mowing vertical position detection unit 12 that detects the vertical position of the mowing device 4 relative to the machine body is provided between the mowing device 4 and the machine body.The mowing vertical position detection unit 12 detects the mowing operation status of the mowing device 4, and when the mowing height detection device 30 detects that the mowing device 4 has touched the ground in the field, the reverse operation using the main shift lever 13 of the traveling device 2 is restricted (locked).Therefore, by doubly detecting the lowered state of the mowing device 4 by the mowing vertical position detection unit 12 and the mowing height detection device 30, unintended reverse movement of the machine body is avoided and damage or malfunction of the mowing height detection device 30 is prevented.

[0035] When the reverse operation of the main speed change lever 13 is restricted, a warning message is displayed on the monitor 14 provided on the control unit 6. Therefore, by doubly detecting the lowered state of the mowing device 4 by the mowing up / down position detection unit 12 and the mowing height detection device 30, unintentional reverse movement of the machine is avoided, preventing damage or malfunction of the mowing height detection device 30, and also making the operator aware that the operation of the main speed change lever 13 is being restricted, improving operability. Furthermore, when the control unit 15 is restricting the operation of the main speed change lever 13, if the main speed change lever 13 is attempted to be operated to the reverse side, the notification means 16 is activated to emit a warning sound, so that the operator is sure to recognize that the operation of the main speed change lever 13 is being restricted, thereby improving operability.

[0036] In addition, a cutting vertical position detection unit 12 is provided between the cutting device 4 and the machine body side to detect the vertical position of the cutting device 4 relative to the machine body side, and when the cutting vertical position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, an alarm means 16 provided at a predetermined position on the machine body sounds a warning sound if the machine moves backward.Therefore, the lowered state of the cutting device 4 is doubly detected by the cutting vertical position detection unit 12 and the cutting height detection device 30, and the alarm means 16 sounds a warning sound, thereby avoiding unintended backward movement of the machine body and preventing damage or malfunction of the cutting height detection device 30.

[0037] When the cutting vertical position detection unit 12 and the cutting height detection device 30 detect that the cutting device 4 is lowered, a warning message is displayed on the monitor 14 of the control unit 6. Therefore, by doubly detecting the lowered state of the cutting device 4 by the cutting vertical position detection unit 12 and the cutting height detection device 30, unintentional backward movement of the machine is avoided, and damage or malfunction of the cutting height detection device 30 is prevented, and the operator can visually recognize the state of the machine, improving operability. In this case, the monitor 14 displays a warning message and / or the notification means 16 sounds a warning sound without requiring the main shift lever 13 to restrict reverse operation, but the main shift lever 13 may require the main shift lever 13 to restrict reverse operation.

[0038] The mowing vertical position detection unit 12 detects the mowing operation state of the mowing device 4, and the mowing height detection device 30 detects that the mowing device 4 has touched the ground in the field, and when the machine body moves backward, the mowing device 4 is automatically raised. Therefore, when the machine body moves backward, the mowing device 4 is automatically raised, which prevents the mowing height detection device 30 from breaking down when the machine moves backward with the mowing device 4 lowered. If the machine moves backward while the cutting vertical position detection unit 12 and the cutting height detection device 30 are detecting that the cutting device 4 is lowered, the notification means 16 sounds an alarm and displays a warning message on the monitor, so that the operator can audibly and visually confirm the control status of the machine and prevent damage or malfunction of the cutting height detection device 30.

[0039] In addition, when the cutting up / down position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the field, if the machine moves backward, the alarm means 16 will sound an alarm and automatic control will be executed to automatically raise the cutting device 4, so that the operator can confirm the backward status of the machine through the alarm means 16 and damage or malfunction of the cutting height detection device 30 will be prevented. In addition, when the cutting vertical position detection unit 12 detects the cutting operation status of the cutting device 4 and the cutting height detection device 30 detects that the cutting device 4 has touched the ground in the field, if the machine moves backward, a warning message is displayed on the monitor 14 and the cutting device 4 is automatically controlled to rise, so that the operator can confirm the backward status of the machine by the warning sound on the monitor 14, and damage or malfunction of the cutting height detection device 30 is prevented.

[0040] It should be noted that the above-described embodiments are illustrated and described individually or mixed together to facilitate understanding, but these examples can be combined in various ways, and the configurations, functions, etc. are not limited by these expressions, and there are of course cases in which a synergistic effect is achieved. [Explanation of symbols]

[0041] 1...machine frame, 2...traveling device, 3...threshing device, 4...reaping device, 5...grain tank, 5...grain tank, 6...control unit, 7...grass dividing device, 8...raising device, 10...reaping blade, 12...reaping up / down position detection unit, 12A...reaping lifting position sensor, 13...main speed change lever, 13A...main speed change lever sensor, 14...monitor, 15...control unit (control device), 16...notification means, 17...HST change Speed ​​section, 30...cutting height detection device, 32...case, 33...front mounting shaft, 34...shaft tube, 35...bracket, 36...mounting portion, 37...deformation portion, 40...grass dividing rod, 41...bent portion, 42...space, 46...rear mounting shaft, 49...spring, 50...contact body, 52...mounting portion, 55...contact portion, 56...mounting portion, 58...detection device, 60...tip portion, 70...stopper mechanism, 71...mounting portion, 72...engaging portion.

Claims

1. A threshing device (3) is provided above a traveling device (2), and a reaping device (4) is provided in front of the threshing device (3). The reaping device (4) is configured to have a plurality of grass dividing devices (7) for dividing culms in a field, a raising device (8) for raising the divided culms, and a cutting blade (10) for cutting the base of the raised culms. In this combine harvester, a cutting height detection device (30) for detecting the height of the reaping device (4) from the ground is provided at a predetermined position on the reaping device (4). The cutting height detection device (30) is connected to a front mounting shaft (33) in the left-right direction to detect the height of the grass dividing device ( The combine is configured to detect the cutting height of the cutting device (4) by the vertical rotation of a case (32) attached to the side of the machine body (7) so as to be freely rotatable on a horizontal axis, and a cutting vertical position detection unit (12) is provided between the cutting device (4) and the machine body to detect the vertical position of the cutting device (4) relative to the machine body, and when the cutting vertical position detection unit (12) detects the cutting operation status of the cutting device (4) and the cutting height detection device (30) detects that the cutting device (4) has touched the field, the combine is configured to restrict reverse operation by the main speed change lever (13) of the traveling device (2).

2. A threshing device (3) is provided above the traveling device (2), and a reaping device (4) is provided in front of the threshing device (3). The reaping device (4) is configured to have a plurality of threshing devices (7) arranged side by side in the left-right direction for threshing the stalks in the field, a raising device (8) for raising the stalks, and a cutting blade (10) for cutting the base of the raised stalks. In this combine harvester, a cutting height detection device (30) for detecting the height of the reaping device (4) relative to the field surface is provided at a predetermined position on the reaping device (4). The cutting height detection device (30) is attached to a front mounting shaft (33) in the left-right direction. The combine harvester is configured to detect the cutting height of the cutting device (4) by the vertical rotation of a case (32) attached to the device (7) so as to be freely rotatable on a horizontal axis, and a cutting vertical position detection unit (12) is provided between the cutting device (4) and the machine body side to detect the vertical position of the cutting device (4) relative to the machine body side, and the cutting vertical position detection unit (12) detects the cutting operation status of the cutting device (4) and, when the cutting height detection device (30) detects that the cutting device (4) has touched the field, an alarm means (16) provided at a predetermined position on the machine body sounds a warning sound if the machine body moves backward.

3. A threshing device (3) is provided above the traveling device (2), and a reaping device (4) is provided in front of the threshing device (3). The reaping device (4) is configured to have a plurality of arborescing devices (7) arranged side by side in the left-right direction for arboresing the stalks in the field, a raising device (8) for raising the stalks, and a cutting blade (10) for cutting the base of the raised stalks. In this combine harvester, a cutting height detection device (30) for detecting the height of the reaping device (4) relative to the field surface is provided at a predetermined position on the reaping device (4). The cutting height detection device (30) is attached to a front mounting shaft (3) in the left-right direction. The combine harvester is configured to detect the cutting height of the cutting device (4) by the up and down rotation of a case (32) attached to the grass dividing device (7) side so that it can rotate freely on a horizontal axis by means of 3), and a cutting up / down position detection unit (12) is provided between the cutting device (4) and the machine body side to detect the up and down position of the cutting device (4) relative to the machine body side, and the cutting up / down position detection unit (12) detects the cutting operation status of the cutting device (4), and when the cutting height detection device (30) detects that the cutting device (4) has touched the field, the combine harvester is configured to automatically raise the cutting device (4) when the machine body moves backward.

4. In the combine harvester according to the invention of claim 1 or 2, when the reverse operation of the main speed change lever (13) is restricted, a warning message is displayed on the monitor (14) provided on the operating section (6).

5. In the invention described in claim 1 or claim 2, the combine harvester is configured so that if an attempt is made to operate the main speed change lever (13) in reverse while the control unit 15 is restricting operation of the main speed change lever (13), an alarm means (16) is activated to emit a warning sound.

6. In the combine harvester of the invention described in claim 3, when the reaping device (4) is automatically controlled to rise, a warning message is displayed on the monitor (14) provided on the operating section (6).

7. In the invention of claim 3, the combine harvester is configured such that when the reaping device (4) is automatically raised, the alarm means (16) is activated to emit a warning sound when the machine body is moved backward.

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