JPS646678Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an automatic cutting height adjustment device for a harvester.

The automatic cutting height adjustment device of the harvester detects the height of the cutting section above the ground using a sensor that slides into contact with the ground surface, and raises and lowers the cutting section according to the detection result. In this case, the width of the dead zone can be widened to prevent the cutting part from following too sensitively, thereby improving control stability, and in relatively flat fields, the width of the dead zone can be narrowed to automatically adjust the cutting height with higher precision. desirable.

With conventional automatic cutting height adjustment devices, it is not easy to change the width of the dead zone. For example, in a conventional device, there is a switch (photoelectric switch 60 shown in FIG.
Each time the width of the dead zone needs to be changed, it is necessary to move the mounting position of the roller (see u, 60d) according to the desired width of the dead zone and then fix it again. This work is troublesome, and it is necessary to adjust the amount of switch movement while checking the new dead band width set by moving the switch, and even a slight change in the switch mounting position can cause the dead band width to increase or decrease. There were some inconveniences such as difficulty in making fine adjustments.

The present invention has been made to solve these inconveniences, and includes a sensor that moves according to the height of the reaping section above the ground, a switchbox equipped with a switch for raising and lowering the reaping section, and a switchbox that includes the sensor and the switch that moves up and down the reaping section. An interlocking member that moves in an interlocking manner, an operating rod of the switch whose base end side is pivotally supported by a switch box, whose distal end side contacts the interlocking member and rotates in accordance with the amount of movement of the interlocking member, and which interlocks with the operating rod. To provide an automatic cutting height adjustment device for a harvester, comprising means for moving a switch box and an operating rod toward and away from an interlocking member in order to adjust the dead zone width of the switch by changing the contact position with the member. purpose.

The present invention will be described in detail below based on its embodiments.

FIG. 1 is an external perspective view of a harvester equipped with an automatic cutting height adjustment device according to the present invention (hereinafter referred to as the device of the present invention). In the figure, K indicates a reaping section, and this reaping section K is composed of dividers 1l and 1r, a grain culm pulling device 2, a cutting blade 3, etc., and the culm is divided by the dividers 1l and 1r. The husk is lifted by a lifting device 2, harvested by a cutting blade 3, and the cut culm is fed to a threshing section D via upper and lower conveyance devices (not shown), and further through a vertical conveyance chain 4. A detection section A of a cutting height sensor that detects the height of the cutting section K from the ground is provided at the lower right side of the cutting section K.

Figure 2 is a right side view of the detection part A of the cutting height sensor.
FIG. 3 is a perspective view from the rear right side. The rightmost divider 1r located at the lower tip of the reaping part K
A guide shaft 11 is screwed onto the mounting rod 5 in a substantially vertical upward direction, and an annular slider 12 is slidably fitted onto the guide shaft 11. A spring receiver 13 is attached to the upper end of the guide shaft 11, and a push spring 20 is fitted onto the guide shaft 11 between the spring receiver 13 and the slider 12, and biases the slider 12 downward. ing.

A cylindrical mounting part 12a with its axial direction extending in the left-right direction of the machine is protruded from the front part of the slider 12, and ground height sensing elements are provided on both the left and right sides of the mounting part 12a. Two sensor arms 14, 14
The front end portions of the sensor arms 14 are rotatably supported, and the sensor arms 14 are located on the left and right sides of the mounting rod 5, respectively.

Each sensor arm 14, 14 has a front portion 14a that is bent rearward and downward from the pivot support at the front end and extends in a straight line, and has a rear end that is gently curved rearward;
An intermediate portion 14b is connected to the rear front portion 14a and has a substantially horizontal shape with its rear end bent upward and forward at an acute angle of about 60 degrees; It consists of a rear portion 14c that is substantially parallel to the portion 14a and extends linearly upward and forward, the rear end portion being located closer to the front end portion, and the rearmost end formed at the intermediate portion 14b. The intermediate portions 14b, 14b of the left and right sensor arms 14, 14 are arranged such that the distance between their rear ends is greater than the distance between their front ends.

The rear end portion of each sensor arm 14, 14 extending upward and forward has the web as the front side, and both flanges as the upper and front side.
It is inserted vertically through both the upper and lower flanges of the U-shaped bracket 15 located on the lower side and is screwed to the upper flange. A stopper 19 is attached to the lower part of the lower flange, and when the sensor arms 14, 14 are rotated downward by a predetermined amount, the stopper 19 comes into contact with the mounting rod 5, and the sensor arms 14, 14 are stopped further downward. This prevents excessive force from being applied to the push-pull wire 30, etc., which will be described later. A vibration isolating rubber 16 is provided on the rear side of the web of the bracket 15, and the vibration isolating rubber 16 absorbs the impact vibration of each sensor arm 14,14. A piece of an L-shaped connecting member 17 is brought into contact with the rear side of the vibration isolating rubber 16, and a screw is inserted through the web of the bracket 15, the vibration isolating rubber 16, and one piece of the connecting member 17 to connect them together. It is fixed.

The other piece of the connecting member 17 is located on the left side and extends rearward, and the lower end of the first link element 6 is pivotally supported on the left side of the other piece. The upper end of the first link element 6 is pivotally supported by one end of a second link element 7, and the other end of the second link element 7 is connected to a rotation shaft 8 whose axial direction is the left-right direction of the aircraft. It is externally fixed on the right end. The central portion of the rotating shaft 8 is rotatably fitted into a cylindrical support tube 25, and the lower side of the support tube 25 is fixed to the upper surface of a flange of a support bracket 26.
The support bracket 26 is made of angle material,
The flange is horizontal and located at the bottom, the web is vertical and located at the front, and the mounting rod 5
Support rod 9 that supports the lifting device 2 etc. installed upright
The front surface of the web is fixed to the rear surface of the support member 27, which is fixed to the support member 27. The support member 27 has a forward U-shape, and its tip is fixed to the support rod 9.

The left end of the rotating shaft 8, which projects leftward from the support tube 25, is fixed to one end of the connecting piece 28, and a connecting sleeve 29 is rotatably attached to the other end. The lower end of the inner wire 30a of the push-pull wire 30 is connected to the connecting sleeve 29. The push-pull wire 30 consists of an inner wire 30a located inside and a sleeve (outer wire) 30b slidably fitted around the inner wire 30a.
The lower end is attached and fixed to the back surface of the pulling device 2 slightly above the lower end of the inner wire 30a. The upper end of the push-pull wire 30 is routed close to the driver's seat.

Therefore, when the sensor arms 14, 14 rotate upward (or downward), the first link element 6 is pushed (or pulled) upward and forward (or backward and downward), and the rear part of the second link element 7 is pushed upward (or downward). The rotating shaft 8 rotates clockwise (or counterclockwise) when viewed from the left side of the machine, and the connecting piece 28 similarly rotates clockwise (or counterclockwise). Rotate to press (or pull) the inner wire 30a of the push-pull wire 30 upward (or downward). In this case, push-pull wire 3
The sleeve 30b of No. 0 is slidable with respect to the inner wire 30a, and its lower end is raised and fixed to the back of the device 2, so that the inner wire 30a
The sleeve 30b remains stationary without being affected by the movement.

FIG. 4 is a perspective view from the rear right side of the electric signal converter B, which is installed near the driver's seat and is connected to the detector A by a push-pull wire 30, FIG. 5 is a right side view thereof, and FIG. is a schematic plan view of the vicinity of the driver's seat. The electric signal converter B is disposed in an auxiliary column 39 located between the driver's seat C and the reaping conveyance section, and is located in the middle of the lower right side of the support plate 31 vertically suspended within the auxiliary column 39. U-shaped fixture 32
The web is screwed so that both flanges face to the right, and two sliding rods 33, 3 are attached to the fixture 32.
The sliding rods 33, 33 are fixed in the middle of the frame 3 so that they are parallel to each other upwardly and downwardly, and the front end is slightly lower than the rear end. A connecting block 34 is slidably fitted in front of the sliding rods 33, 33, that is, in front of the fixture 32, and the upper end of the sleeve 30b of the push-pull wire 30 is fixed to the connecting block 34. has been done. The lower end of a dogleg-shaped connecting link 35 is pivotally supported on the left side surface of the connecting block 34, and the bent portion at the center of the connecting link 35 is pivotally supported on the right front lower part of the support plate 31. Furthermore, the upper end of the connecting link 35 is a connecting rod 36 that extends upward and forward.
It is pivoted at the lower end of the. The upper end of the connecting rod 36 is pivoted in the middle within the auxiliary column 39, and has a connecting piece 37 extending in the front-rear direction that can swing up and down.
The adjustment lever 38 is fixed to the front part of the lever 38, and the upper part of the lever 38 is connected to the auxiliary column 3.
It is made to protrude from the upper surface of 9. The adjustment lever 38 is rotatable in the front-back direction, and is configured to be latched at several positions in the front-back direction. When the connecting piece 37 is rotated downward (or forward), the rear part of the connecting piece 37 is rotated downward (or upward) to press and move the connecting rod 36 backward and downward (or forward and upward) in its axial direction, and the upper part of the connecting link 35 is rotated downward (or forward). is rotated backward and downward (or upward and forward), the lower part of the connecting link 35 is rotated forward (or backward), and the connecting block 34 is moved forward (or backward). Therefore, the sleeve 30b attached to the connecting block 34 is pushed (or pulled) forward (or backward) and moves forward (or backward), so that the sleeve 30b is attached to the lower end of the inner wire 30a with respect to the inner wire 30a. That is, it moves in a direction toward (or away from) the sensor arm 14. However, sleeve 30b
Since the lower end is fixed to the back of the pulling device 2, the sleeve 30b does not move, and the inner wire 30a moves relatively, and the pressure (or pull) of the sleeve 30b causes the inner wire 30a to move away from the fixed lower end of the sleeve 30b. The extended portion of the inner wire 30a further retracts (or advances) from the sleeve 30b.
As a result, the sensor arm 14 pulls (or presses) the reaping part K upward (or downward).
will be done.

A limit switch 40 is provided on the left side of the support plate 31 in the moving area of the connecting rod 36.
An operating piece 36a is provided in the middle of 6, and an adjustment lever 38 is rotated to the rearmost position so that the connecting block 34
When the sensor arm 14 is pulled to the highest retracted position, the actuating piece 36a comes into contact with the limit switch 40 and turns on, and by turning on the limit switch 40, the cutting height is automatically adjusted. is now prohibited.

A sliding block 41 is slidably fitted to the rear of the sliding rods 33, 33, that is, to the rear of the fixture 32. The front part of the sliding block 41 is formed to protrude to the right of the fuselage, and the left side of the sliding block 41 is connected to the sliding rod 33,
33 is inserted at the top and bottom. Further, the inner wire 30a of the push-pull wire 30 is inserted through the left side of the sliding block 41, and the inner wire 30a of the push-pull wire 30 is inserted through the left side of the sliding block 41.
1. It is screwed on the rear side.

Coil springs 42, 42 for biasing the sliding block 41 backward are fitted between the rear surface of the fitting 32 of the sliding rods 33, 33 and the front surface of the sliding block 41, respectively. Spring receivers 46, 4 provided on the rear surface and the rear end of the sliding rods 33, 33
Coil springs 43, 43 for urging the sliding block 41 forward are respectively fitted in the portion between the sensor 6 and the sensor. Arm 1
4 and 14 downward, and the position of the sliding block 41 is stabilized by coil springs 42 and 42.

At the rear upper part of the support plate 31, one end of each of link members 51 and 52 located above a pantograph-shaped four-sided link 50 is pivotally supported via a spacer 57, and the other end of the upper rear link member 52 is The link member 53 is pivotally supported at one end of the link member 53 on the lower rear side.
The other end of the link member 54 is pivotally supported along with one end of the lower front link member 54 on a vertically upwardly extending portion of an L-shaped switchbox support member 49, which will be described later. It is pivotally supported at one end of the link member 51, and its pivot shaft has its tip protruding from the upper surface of the auxiliary column 39, and its intermediate portion is connected to the support plate 31.
The lower end of a dead band width adjusting lever 58 pivotally supported at the upper front end is engaged in a long hole 59 extending in the longitudinal direction thereof. L-shaped switchbox support member 4
The two link members 5 on the lower side of the four-side links 50 are located at the center of one piece extending upward in the vertical direction of the four-side link 50.
The front end of 3 and the rear end of 54 are both pivoted at the same pivot point, and a switch box 44 is fixed to the lower side of a piece extending horizontally on the right side of the fuselage.
Furthermore, guide pins 56, 56 are fixed to the vertically upwardly extending portions of the switchbox support member 49 toward the front and rear sides of the fuselage, respectively. Two guide holes 55, 55 are opened in parallel, and the guide pins 56, 56 are slidably inserted into the guide holes 55, 55, respectively.

The dead zone width adjustment lever 58 is rotatable in the front and back direction and is configured to be latched at several appropriate locations.
In other words, when the body is rotated rearward (or forward), its lower end portion moves forward (or backward), and the pivot point between link member 51 and link member 54 is moved forward (or rearward), causing link member 51 and link member 54 to move forward (or backward). Link member 5
2 are rotated upward (or downward) using the pivot points of both members as rotation fulcrums, and the link member 54 is rotated upward (or downward) about the pivot point with the link member 51.
and rotate the link member 53 upward (or downward) about the pivot point with the link member 52,
The four-sided link 50 has a horizontally (or vertically) long flat shape that is compressed in the vertical (or horizontal) direction, and the pivot point of the two upper link members 51 and 52 is the support plate 31.
Since the pivot point between the lower link members 53 and 54 moves upward (or downward),
An L-shaped switchbox support member 49 fixed to a pivot point between link members 53 and 54 moves in parallel upward (or downward) along guide holes 55 and 55 together with switchbox 44.

The switchbox 44 has two built-in photoelectric switches, and the switchbox 4 is operated via an operating shaft 47 by rotating an operating rod 45 protruding to the right of the aircraft body.
The device selectively operates one of the photoelectric switches by rotating a substantially sector-shaped cam body 60 (see Fig. 7) inside the L-shaped switch box support member 49 horizontally to the right side of the machine body. A switch box 44 is attached to the lower side of the piece extending from the switch box 44, and an operating shaft 47 that selectively operates the two photoelectric switches in the switch box 44 is attached to the lower right side of the switch box 44. block 41
The lower end of an operating shaft 47, the upper part of which is fixed to the operating rod 45, protrudes so as to come into contact with the rear right side of the operating shaft 45.

Therefore, when the sliding block 41 slides backward (or forward) by a predetermined amount or more and the lower end of the operating rod 45 is rotated backward (or forward) by a predetermined amount or more, the operating shaft 47
cam plate 60 in switchbox 44 via
(See FIG. 7) is rotated backward (clockwise in FIG. 7) (or forward (counterclockwise in FIG. 7)) to operate one of the photoelectric switches.

FIG. 7 is an explanatory diagram of the operation of the switchbox. The substantially fan-shaped cam plate 60 is connected to the switch box 4.
4 is connected to an operating shaft 47 which is connected to an operating rod 45 at a portion extending outward. Reference numerals 60u and 60d are photoelectric switches for raising and lowering the reaping section K, respectively, and as shown in FIG. When the photoelectric switch 60u or 60d is turned clockwise (clockwise) and passes the position indicated by the dashed line, the photoelectric switch 60u or 60d
The reaping section K is operated to raise (or lower) the reaping section K by switching a solenoid valve installed in a hydraulic circuit of a hydraulic cylinder that raises and lowers the reaping section K.

The range until the cam plate 60 rotates and crosses the dashed line is a dead zone, and the dashed double dot line indicates the rotation point of the sliding block 41 relative to the operating rod 45 at the position of the dashed dotted line of the cam plate 60 and the operating rod 45. The range of this two-dot chain line is the range of the operating rod 4.
7 and the rotation center of the cam body 60 below the center line of the switch box 44 in a fan shape, and the width of the portion (upper part) close to the rotation center of the cam body 60 and the operating rod 47 is Narrow, cam body 6
0 and the portion (downward) remote from the center of rotation of the operating rod 47 has a wider width. Cam body 6
0 and the center line of the operating rod 47 are within the range of the two-dot chain line, the photoelectric switches 60u and 60d will not operate. In some cases, the amount of movement of the sliding block 41 where the center line of the operating rod is within the range of the two-dot chain line is smaller than when the rotation point is far from the rotation center, that is, when it is located on the lower side of the fuselage. Become.

Therefore, the switchbox 44 is connected to the sliding block 4.
1, the dead zone width of the photoelectric switches 60d and 60u relative to the sliding block 41 becomes narrower (wider).

The operation of the device of the present invention constructed as described above is as follows. Normal automatic cutting height adjustment detects the height of the cutting part K from the ground by sliding the middle parts 14b, 14b of the sensor arms 14, 14 on the ground surface. When becomes more than (or less than) a predetermined value, the sensor arms 14, 14 are pressed upward (or downward) by the ground surface (or by the coil springs 43, 43), and the rear ends of the sensor arms 14, 14 are pressed upward (or downward) by the ground surface (or by the coil springs 43, 43). (downward). As a result, the first link element 6 is pressed (or pulled) upward and forward (or backward and downward), and the second link element 7 is rotated upward (or downward), and the second link element 7 is rotated upward (or downward). The fixed rotation shaft 8 rotates clockwise (or counterclockwise) when viewed from the right side of the machine, and rotates the rear end of the connecting piece 28 fixed to the left end upward (or downward). , inner wire 3 of push-pull wire 30
Press (or pull) 0a upward (or downward). Due to this pressing (or pulling) of the inner wire 30a, the sliding block 41 of the electrical signal converter B provided in the auxiliary column 39 is moved backward against the urging force of the coil springs 43 (or due to the urging force). (or forward), rotate the operating rod 45 backward (or forward), and turn on the photoelectric switch for raising (or lowering) the reaping section in the switch box 44. This causes the reaping part K to rise (or fall). As the reaping part K rises (or descends), the sensor arms 14, 14 rotate downward (or upward) by the biasing force of the coil springs 43, 43 (or the pressing force from the ground surface), and the sliding block 41 is rotated downward (or upward). moves forward (or backward) and the reaping part K
When the height from the ground falls within the appropriate cutting height range, all the photoelectric switches in the switch box 44 are turned off, and the movement of the cutting section K is stopped.

When raising (or lowering) the cutting height depending on the growth condition of the grain culm, etc., rotate the adjustment lever 38 forward (or backward) to move the rear end of the connecting piece 37 upward (or downward). The connecting rod 36 is rotated upward and forward (or backward and downward), the connecting link 35 is rotated backward (or forward), and the connecting block 34 is moved backward (or forward). As a result, the push-pull wire 3 is attached to the connecting block 34.
The sleeve 30b of No. 0 is pulled (or pressed) backward (or forward), and as described above, the end of the inner wire 30a on the sensor arm 14 side is attached to the sleeve 30b.
It will advance (or retract) from the lower end b, and the rear end portions of the sensor arms 14, 14 will move downward (or upward). In this case, the amount of movement of the inner wire 30a is the amount of movement of the connecting block 34, and the position of the sliding block 41 does not move, so the relative position between the operating rod 45 and the sliding block 41 does not change. Therefore, the dead zone position in which the photoelectric switch in the switch box 44 does not operate can be moved downward (or upward) with respect to the reaping section K by moving the rear end portions of the sensor arms 14, 14 downward (or upward) with respect to the reaping section K. (or upward), and the dead zone position is separated (or approached) by the reaping part K.
The required high mowing (or low mowing) will be performed.

Furthermore, when widening (or narrowing) the dead zone width depending on the field conditions, etc., rotate the dead zone width adjustment lever 58 backward (or forward) to move the pivot point of the link members 51 and 54 of the four-side link 50 forward (or When the four-side link 50 is compressed in the vertical (or front-back) direction, the switch box support member 49
and switch box 44 upward (or downward)
Move parallel to . As a result, the sliding block 41
The point of rotation relative to the operating rod 45 moves toward the tip (or center of rotation) of the operating rod 45, and the amount of movement of the sliding block 41 in the front-back direction, in other words, in the up-down direction of the sensor arms 14, 14. The photoelectric switch 60u in the switch box 44 for the amount of movement of
The dead zone of 60d becomes wider (or narrower).

Further, when the adjustment lever 38 is turned significantly backward, the connecting rod 36 moves rearward and downward, and the connecting block 34
moves forward greatly, the sleeve 30b is pressed, and the end of the inner wire 30a on the sensor arm 14 side retracts into the sleeve 30b, and the sensor arms 14, 14 are in the upper retracted position, but the connecting rod 3
By moving backward and downward of 6, limit switch 4
0 is turned on and automatic adjustment of cutting height is prohibited.

Therefore, in the present device, the center of rotation of the operating rod 45, which operates the reaping section lift switches 60u and 60d by its rotation, and the interlocking mechanism that moves in conjunction with the sensor arm 14, which is the height sensor above the ground of the reaping section K. Since the distance between the rotating point of the sliding block 41, which is a member, and the operating rod 45 can be changed, it is possible to easily change the dead zone width of the automatic cutting height adjustment device of the harvester. Become. Also,
As in this embodiment, the operating lever 58 of the sliding block 41 is operated by the operating lever 58 located near the driver's seat C.
5, the driver can easily change the width of the dead zone of the automatic cutting height adjustment device.

Although the proposed device uses an operating lever and four-sided links to move the switch box in the vertical direction and change the distance between the center of rotation of the switch operating rod and the point of action, other manual operations are possible. Although the dead band width adjusting lever is latched at several appropriate positions, it is of course possible to use a continuously variable adjustment lever.

As described in detail above, in the present device, the switch box and the operating rod for operating the switch in the switch box can be moved integrally toward and away from the interlocking member, allowing easy and accurate dead zone adjustment. The present invention has excellent effects, such as being able to change the width, quickly adjusting according to field conditions during harvesting, and maintaining an appropriate cutting height.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention.
The figure is an external perspective view of a harvester equipped with the proposed device, Figure 2 is a right side view of the detection section of the cutting height sensor installed in the reaping section, Figure 3 is a perspective view from the rear right side, and Figure 4 The figure is a perspective view from the rear right side of the electric signal converter of the cutting height sensor, Figure 5 is its right side view, Figure 6 is a schematic plan view of the vicinity of the driver's seat, and Figure 7 is the right side of the switch box. It is an explanatory diagram of the operation seen from. K... Reaping section, A... Detection section, B... Electric signal conversion section, 1l, 1r... Divider, 2... Pulling device, 14... Sensor arm, 28... Connection piece,
30...Push pull wire, 33...Sliding rod,
34... Connection block, 38... Adjustment lever, 41
...Sliding block, 44...Switchbox,
45... Operating rod, 50... Four side links, 58...
Dead band width adjustment lever, 60...Cam plate, 60u, 6
0d...Photoelectric switch.

Claims (1)

[Scope of utility model registration request] A sensing body that moves according to the height of the reaping section above the ground, a switch box equipped with a switch for raising and lowering the reaping section, an interlocking member that moves in conjunction with the sensing section, and a base end side of the switch box that is pivoted to the switch box. , an operating rod of the switch whose tip end side contacts an interlocking member and rotates according to the amount of movement of the interlocking member, and a dead zone width of the switch is adjusted by changing the contact position between the operating rod and the interlocking member. 1. An automatic cutting height adjustment device for a harvester, comprising means for moving a switchbox and an operating rod near and far relative to an interlocking member.