JPS582194Y2 - Reaping section lifting device in a reaper - Google Patents

Description

[Detailed description of the invention] This invention consists of a first state in which the reaping section, which is connected to the front of the machine so that it can be raised and lowered by a drive, is manually raised and lowered, and a sensor for detecting the current cutting height installed under the reaping part. It was developed to quickly and reliably switch to the second state of automatically driving up and down based on the detection results, and has a single operating lever that can be moved along a series of linear paths. The present invention relates to a reaping section elevating device in a reaper that is configured to be switchable between the first state and the second state.

Generally, during reaping work in wet fields or highly humid fields, the current cutting height detection sensor installed under the reaping part settles in the field, which not only makes it impossible to accurately detect the cutting height, but also makes it erroneous. Because there is a risk of detection activation, human control means are adopted to manually drive the reaping section up and down.
In cases where the sensor can accurately follow the field conditions, such as in dry fields, in order to simplify the lever operation involved in adjusting the cutting height during the reaping process, it is possible to use a sensor based on the detection results of the sensor. An automatic control means is adopted to automatically drive the lift up and down.

In this way, it is necessary to switch the operating lever to the first or second state depending on the field conditions such as wet fields or dry fields. It is very difficult to detect the boundary position between the operating range and the automatic operating range, and even if you think you have switched the operating lever to the manual operating range or automatic operating range, it may actually be within the automatic operating range or manual operating range. As a result, there is a risk that control will be performed in a completely different manner than the operator intended, such as the reaping section being suddenly driven up and down.

In view of the above-mentioned circumstances, the present invention makes it possible to accurately judge whether the operating lever has been switched to the manual operating range or the automatic operating range by adding an extremely simple structure. The above-mentioned device is characterized in that a resistor is provided that provides significant operational resistance to the lever when switching between the manual operation range and the automatic operation range of the lever.

With this, it is possible to accurately judge whether the operating lever has been switched to the manual operating range or the automatic operating range based on the significant operating resistance that acts when switching between the manual operating range and the automatic operating range of this lever. This has made it possible to safely and reliably control the cutting height as intended by the operator.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a combine harvester, which is an example of a reaping machine, and the front of the machine 2, which is equipped with a threshing device 6, is a pulling device 3A,
Reaping unit 3 consisting of a clipper-type reaping device 3B, a vertical conveyance device 3C that changes the posture of the culms that have been harvested in an almost vertical position to a sideways position, and then transports and supplies them to the threshing feed chain 6A.
is provided to be movable up and down around the -th horizontal axis 8 of the end portion of the reaping frame 3D that supports the reaping section 3, and is provided between the pulling device 3A and the threshing device 6, and between the reaping device 3A and the threshing device 6; The control section 7 configured on the side part of 3C has a first state in which the reaping section 3 is manually driven up and down, and an automatic control section 7 based on the detection result of the current cutting height detection sensor 4 provided in the reaping section 3. A single operating lever 1 is provided which can be switched between the operating lever 1 and the second state in which the operating lever 1 moves up and down. A linking mechanism 8 is provided which changes the position of the ground contact 4a of the sensor 40 between a detection position and a non-detection position retracted above the weeding support rod 3E in conjunction with the switching.

A control mechanism for driving the reaping section 3 up and down by manual operation is constructed as shown in FIG. 2.

That is, a comparator compares a setting signal from the setting device 9, which is configured so that the output voltage changes depending on the position setting of the operating lever 1, and a level detection signal, which is configured so that the output voltage changes depending on the attitude change of the reaping frame 3D. 11, and the difference signal from the comparator 11 is inputted to discriminators 12A and 12B for raising and lowering, which determine whether the reaping section 3 should be raised or lowered. The control valve 14, which controls the operation of the hydraulic cylinder 13 that drives the hydraulic cylinder 13 up and down around the horizontal axis 8, and the discriminators 12A and 12B are interlocked via the amplifiers 15A and 15B. The reaping section 3 is operated by switching the control pulp 14 in response to a command signal from one of the discriminators 12A or 12B, so that the setting signal from the setting device 9 and the detection signal from the level detector 10 become equal. It is configured so that it can be raised or lowered.

Further, a control mechanism for automatically raising and lowering the reaping section 3 based on the detection result of the sensor 4 is configured as follows.

That is, a first switch SW1 detects that the ground contact 4a of the sensor 40 has been oscillated upward by a certain amount or more, and a second switch SW2 is configured to detect that the ground contact 4a has been oscillated downward by a certain amount or more. At the same time, the detection signals from these rain detection switches SW1 and SW2 are inputted to the control pulp 14 via the amplifiers 16A and 16B, so that when the first switch SW1 is activated for detection, the detection signals are input to the control pulp 14. While outputting a rising signal to drive and raise the reaping section 3, the second switch SW
2 is detected, a lowering signal is output to the pulp 14 to drive the reaping section 3 lower.

As shown in FIGS. 3 and 4, C of the series of linear paths 18 formed by the operation lever 1 on the operation guide plate 17 is located at the connection point between the manual control circuit and the automatic control circuit.
A third switch SW3 is provided to detect whether the position is in the manual operation range P1 or the automatic operation range P2 and switch between the manual control state and the automatic control state, and a third switch SW3 is provided on the operation guide plate 17. Straight path 18 formed
When switching between the manual operation range P1 and the automatic operation range P2 of the operation lever 1, there is a position corresponding to the boundary position between the manual operation range P1 and the automatic operation range P2. An elastic body 5 such as a leaf spring is provided to provide resistance.

Further, the operating lever 1 is configured to be held at a desired operating position by a friction mechanism (not shown) provided at its swing fulcrum or in the middle of its operating system.

The linking mechanism 8 is constructed as follows.

That is, the sensor box 4A of the sensor 4 is pivotally mounted to the fixed frame 8A provided on the weed support rod 3E so as to be vertically swingable about the second horizontal axis with respect to the direction of movement of the aircraft. A spring 8B is interposed between the sensor box 4A and the fixed frame 8A to move and bias the entire sensor box 4A including the ground contact 4a downward, and the sensor box 4A and the operating lever 1 are operated. Interlockingly connected via the wire 8C, and thus interlocking with the switching operation between the first state and the second state by the operating lever 1,
The ground contactor 4a is configured to be changed between a detection action position and a non-detection action position in which it is retracted above the weeding support rod 3E against the elastic biasing force of the spring 8B.

Further, by appropriately setting the operating lever 1 within an automatic operation range P2 in the linear path 18, the detection reference position of the sensor 4 can be changed upward or downward.

In addition, numeral 19 in the figure is a set bolt that regulates the lower limit position of the ground contact 4a of the sensor 40.

Further, in the above embodiment, when switching between the manual operation range P1 and the automatic operation range P2 of the operation lever 1, this lever 1
Although an elastic body such as a leaf spring is used as the resistor 5 that provides a significant operating resistance, a friction mechanism that holds the operating lever 1 at a desired operating position may also be used.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the reaping section lifting device in the reaping machine according to the present invention, and FIG. 1 is an overall side view of the combine harvester;
FIG. 2 is an elevation control system diagram of the reaping section, FIG. 3 is an enlarged side view of the main part, and FIG. 4 is an enlarged partially cutaway plan view of the main part. 1... Operation lever, 2... Machine, 3.
... Reaping section, 4 ... Current reaping height detection sensor, 5 ... Resistor.

Claims (2)

[Scope of utility model registration request] (1) Reaping in the first state, in which the reaping section 3, which is connected to the front of the machine 2 and can be raised and lowered, is manually driven up and down using a single operating lever 1 that can be moved along a series of linear paths. The reaper is configured to be able to switch to a second state in which the mowing height is automatically raised or lowered based on the detection result of a sensor 4 for detecting the current cutting height provided under the section 3, and the reaper has a manual operation range of the lever 1 and A reaping section elevating device for a reaping machine, characterized in that a resistor 5 is provided to provide significant operational resistance to the lever 1 when switching between an automatic operation range and an automatic operation range. (2) The reaping section elevating device in a reaping machine according to claim 1, wherein the resistor 5 is an elastic body attached to the side of the linear path that guides the movement of the lever 1.