JPS60118111A - Harvester - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a harvester equipped with an automatic cutting height adjustment device.

Harvesters are usually equipped with an automatic cutting height adjustment device that detects the height of the cutting section above the ground and raises and lowers the cutting section based on the detection result to achieve a predetermined cutting height. With such a harvester, the reaping part is close to the screen during work, so when the machine is moved backwards, the reaping part comes into contact with the field surface, causing damage to the crop.
The present invention was made in view of this situation, and when the threshing clutch is in the power transmission state and the machine is operated to move backward, the reaping section is raised by a predetermined amount. The purpose of the present invention is to provide a harvester that avoids damage to the reaping section.

The present invention will be described below based on drawings showing embodiments thereof. FIG. 1 is a left side view of a harvester according to the present invention. In the figure, 1 is a running vehicle, and a threshing device 3 and the like are installed above rollers 2 that run on the lower side. On the front side of the outside traveling vehicle 1, a reaping section 8 consisting of a grass dividing plate 5 degree pulling device 6, a cutting blade 7, etc. is pivoted so as to be able to rise and fall freely by a hydraulic cylinder 4 provided at the bottom of the traveling vehicle 1. supported.

A mowing height sensor 9 is provided on the support rod 5a of the grass dividing board 5 in the mowing section K to detect the height of the mowing section above the ground.

The cutting height sensor 9 has a sensor arm 9a and a sensor box 9b, and when the sensor arm 9a slides on the field surface and rotates up and down, a lowering command switch 91 in the sensor box 9b is activated. By selectively operating the lift command switch 92 (see FIG. 2), the hydraulic cylinder 4
The reaping section is raised and lowered to reach a predetermined cutting height.

FIG. 2 is a control electronic circuit diagram of the machine of the present invention. In the figure, 21 is a battery whose negative electrode is connected to body ground, and whose positive electrode is connected via a key switch 22 to various switches and an M control section 40, which will be described later.

The control unit 40 selectively energizes or demagnetizes the solenoids Sd and Su in accordance with the status of each switch, which will be described later. It controls the elevation of the reaping section 8.

Each input terminal of the control section 40 includes a threshing switch 23 that is turned on when the threshing clutch is in the power transmission state, a reaping switch 24 that is turned on when the reaping latch is in the power transmission state, and a mowing height control switch that controls the elevation of the reaping section. An automatic cutting height switch 25 that is turned on when automatic cutting is performed based on the detection result of the cutting height sensor 9, a reverse switch 2G that is turned on when the traveling device is set to reverse gear, and a sensor arm in the cutting height sensor 9. A lower command switch 91 and a higher command switch 92, which are turned on in response to the vertical rotation of 9a, cut height flll.
When performing section i1 manually, a manual lower switch 31 and a manual raise switch 32, which are turned on when lowering the reaping section, are connected to each other, and these switches are connected to the key switch 22 all at once. There is.

The above-mentioned solenoid SD for lowering the reaping section, solenoid Su for raising the reaping section, and automatic lamp 29 are connected to each output terminal of the control tNO section 40, respectively.

The operation of the apparatus of the present invention constructed as described above will be explained based on the flowchart of FIG. When the key switch 22 is turned on, the control section 4o becomes controllable, and the automatic switch 25 is turned on to automatically adjust the cutting height. When the automatic switch 25 is turned off, the manual switch 31
．． 32 allows manual adjustment of the cutting height. Further, when the reaping latch and the threshing clutch are brought into a power transmitting state, the reaping switch 25 and the threshing switch 23 are turned on, and the reaping section 8 and the threshing section 3 are driven to become ready for reaping and threshing. When the machine is moved forward to perform reaping and threshing operations, the reaping section 8 enters a so-called automatic mode in which it is raised and lowered in accordance with the status of the lower command switch 91 and the higher command switch 92 in the cutting height sensor 9. When the automatic lamp 29 is turned on and the height of the mowed area 8 above the ground is below (or above) a predetermined value, the descending (or ascending) command switch 91 (or 92) is turned on, and the solenoid Sd (or S
u) is excited, the piston rod in the hydraulic cylinder 4 moves in (or advances), and the reaping part 8 descends (or moves forward).
rise] Even in this automatic mode, manual switch 3
Priority is given to raising and lowering by 1°32, and the automatic ramp 29 clears during this manual adjustment.

During such reaping work, the traveling device is set to reverse gear to move the machine in reverse, or the #& forward switch 26 is turned on.

In this case, the threshing clutch is in the engaged state, so the threshing switch 23 is in the on state, and the flag F3. F
2 and Fl are not in the set state, so the solenoid Su
is excited over a predetermined interval T2, and the reaping section 8 is brought to the upper retracted position, and when the reverse switch 26 is turned on, a flag F1 indicating that the reaping section is turned upward is set.

Therefore, when the threshing clutch is in the engaged state and the traveling device is in the reverse gear, the reaping section is in the upper retracted position, and there is no risk that the reaping section 8 will come into contact with the screen and be damaged due to the backward movement of the machine. Flag F1 is reset when the reverse switch is turned off.

In addition, when the manual lowering switch 31 or the manual raising switch 32 is turned on when the reaping part 8 is raised, priority is given to raising and lowering the reaping part 8 by this manual switch 31.32, and the manual switch 31.32 When either of them is turned on, the excitation of the solenoid Su is stopped, and thereafter the solenoid Su or Sd is energized based on the manual switch 31 or 32. The flag F1 is not set when manual lifting is performed.

In addition, if the cutting height sensor 9 detects that the cutting part 8 is not yet in the upper retracted position after the cutting part 8 has been raised by turning on the threshing switch 23 and the reverse switch 26, When the lowering command switch 91 in the height sensor 9 is in the OFF state, the solenoid Su is further excited for a predetermined time T2, and the reaping part 8
is set as the upper retraction position. When such a state is reached, a flag F2 indicating that the reaping section has been raised is set by turning off the 1-hour lowering switch 91 of the cutting height sensor 9, and a flag F3, which will be described later, is set.
is in the reset state.

Even in this case, priority is given to lifting and lowering using the manual switches 31 and 32.
32, the flag F2 is not set. The flag F2 is reset when the reverse switch 26 is turned off. Further, even after the raising 1 of the reaping part 8 is once executed by turning the lowering command switch 91 in the sensor 9 into the OFF state, if the lowering command switch 91 appears in the OFF state, the reaping part 8 is raised each time. The process is executed with the reverse switch 26 on regardless of whether the threshing switch 23 is on or off.

Then, when the raising of the scraping part is executed by turning off the lowering command switch 91 and the flag F2 is in the S/O state, the reaping part 8 is raised even if the threshing switch 23 and the reverse switch 26 are turned on. Never. Therefore, when the reaping section 8 is in the upper position, there is no risk that the reaping section 8 will be raised further, and the operator can work safely without feeling confused.

Even in this case, if the cutting section is not in the upper retracted position, the lowering command switch 9 of the cutting height sensor 9
1 is turned off, the reaping section 8 is raised.

When the reverse switch 26 is once turned off, the flag F
2 is reset, so if the reverse switch 26 and the threshing switch 23 are turned on afterwards, the reaping section 8 will be raised.

When the reaping latch that transmits or interrupts power to the reaping section 8 is placed in a power cutoff state, the reaping switch 24 is turned off and the solenoid Su is energized for a predetermined time T.
The reaping section is set in a sufficiently high upper retracted position. This predetermined time T1 is longer than the rising time T2 when the reverse switch 26 is turned on. This is because when the reverse switch 26 is turned on, the culm is normally harvested in the same line, so there is no need to ensure that the reaping section is in the upper retracted position, whereas when the reaping switch 24 is turned off, ,
This is because the reaping section 8 must be reliably placed in the -1 retracted position during normal turning. In this case, when the reaping switch 24 is turned off, the flag F3 indicating that the reaping section 8 has been raised is set to the cent state. Therefore, for example −
When the reaping operation for a stroke is completed and the reaping operation is to be carried out for the next stroke, the reaping latch is placed in the power cutoff state, and the reaping section 8 is placed in the upper retracted position, which greatly simplifies the operation. Furthermore, since the raising time of the scraping part is sufficiently long, the upper retracted position is ensured, and there is no risk of damaging the cutting part when turning.

When the flag F3 is set, in which the reaping section 8 is raised by 1 due to the reaping switch 24 being turned off, there is no risk that the reaping section 8 will be raised even if the threshing switch 23 and the reverse switch 26 are turned on. If the lowering command switch 91 of the height sensor 9 is in the OFF state, the solenoid Su is energized for a predetermined time T2, and the reaping part 8 is raised.

The flag F3 is reset when the reaping switch 24 is turned on when the reaping latch is in the power transmission state, or when the cutting section is raised by turning off the lowering command switch 91 of the cutting height sensor 9.

As detailed above, in the present invention, when the threshing clutch enters the power transmission state and the traveling device is set to reverse gear, the reaping section is raised for a predetermined period of time, so that the reaping section is displayed on the screen. During close work, even when moving the machine backwards, the reaping section is automatically moved to the upper retracted position, allowing the work to be carried out safely without the risk of damaging the reaping section.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a left side view of the inventive machine, FIG. 2 is a main electronic circuit diagram, and FIG.
The figure is a flow chart for detailed explanation of the present invention. 1... Traveling vehicle 3... Threshing section 8... Reaping section
9... Mowing height sensor 23... Threshing switch 24
... Reaping switch 25 ... Automatic switch 26.
...Reverse switch 29...Auto lamp 31...
Manual down switch 32...Manual up switch Sd
, Su...Solenoid patent Applicant: Yanmar Agricultural Machinery Co., Ltd. Agent Patent attorney: Noboru Kono

Claims (1)

[Claims] 1. In a harvester that detects the height of the reaping section above the ground and controls the raising and lowering of the reaping section to a predetermined height above the ground, the threshing clutch that transmits or cuts off power to the threshing section is set to a power transmission state, and the machine 1. A harvesting machine characterized in that when the harvesting machine is operated to move the harvesting machine backward, the harvesting part is raised for a predetermined period of time.