JPH0127637Y2 - - Google Patents

Description

[Detailed description of the invention] Conventionally, a combine harvester that detects the culm length using a plurality of spearhead detection sensors and automatically controls a handling depth adjustment device based on the detection signal has a plurality of spearhead sensors 4, 5 in parallel,
When any of the tip sensors detects, it issues a detection signal, regardless of the other tip sensors, and causes the handling depth adjustment device to operate either shallow handling or deep handling.

Therefore, if the tip sensor 4, which is located closest to the ear and emits a long culm signal, becomes entangled with a long weed such as a grasshopper, grain culm, straw waste, etc., the tip of the grain culm being transferred may come into contact with it. If a detection signal is issued even though there is no short culm, and a short culm is being transported at that time, a short culm detection signal by the intermediate sensor 5 will be issued at the same time, and the motor 6 or solenoid that is the drive source of the handling depth adjustment device will be activated. Since the relay circuits 9 and 11 at the final stage do not operate, the grain culms are fed into the self-extraction state while being shallowly handled, resulting in unhandled grains.

The present invention is an attempt to improve the above-mentioned drawbacks, and a plurality of ear tip detection sensors are provided in the ear transfer path, and the handling depth adjustment device is automatically controlled by a control circuit including the ear tip detection sensors. The combine harvester is characterized in that the tip sensors are connected in series and inserted into the control circuit so that the one located on the stock side has priority.

The embodiments shown in the drawings will be explained below.
Reference numeral 1 denotes a panicle side conveyor, and a handling depth adjustment device is installed below it to clamp and convey the plant base, as in the conventional one, and to tilt it toward the culm. A main sensor 3 for detecting the presence or absence of grain culms is placed on the plant side of the plant 1, and an upper sensor 4 and a middle sensor 5, which constitute a tip sensor, are provided on the tip side. 5 is inserted into the control circuit on the power side of the upper sensor 4.

Then, while the grain culm is being conveyed and the main sensor 3 is turned ON in the control circuit shown in FIG. When the handling depth is appropriate, the motor 6 that operates the handling depth adjustment device is stopped, but short grain culms are transported and placed on the sensor bar 5a of the medium sensor 5. When the ears are no longer in contact with each other, the intermediate sensor 5 turns OFF and issues a shallow handling signal, which is converted by the inverting circuit 7 and inputs the shallow handling signal to the transistor 8, which activates the relay 9 and outputs the shallow handling signal to the motor 6. rotates in direction A, the handling depth adjustment device operates to adjust the depth of handling, and as the grain culm rises and pushes the ear sensor bar 5a, the middle sensor 5 turns ON, and the output of the negative circuit 7 becomes 0 and motor 6
stops.

Furthermore, when the long culm is transferred, the intermediate sensor 5 is turned on, and when the upper sensor 4 also detects the panicle in this state, the negative circuit 7 is turned on.
The output of is 0, and the relay 9 is in the non-operating state as shown.

On the other hand, when the upper sensor 4 is turned on, the deep handling detection signal is directly input to the transistor 10, the relay 11 is activated, the motor 6 is energized, the motor 6 rotates in the direction B, and the handling depth adjustment device is moved to the shallow position. The motor 6 stops when the handling adjustment is activated and the tip of the ear no longer contacts the sensor bar 4a of the upper sensor 4.

Since the intermediate sensor 5 and the upper sensor 4 are inserted in series in the control circuit with the intermediate sensor 5 on the power supply side, weeds, especially grasshopper, etc. mixed into the grain culms being transported during the reaping operation can be removed. When a long grain, straw, etc. that protrudes toward the ear side becomes entangled with the sensor bar 4a of the upper sensor 4, the upper sensor 4' is turned ON and tries to issue a long culm signal. If the grain culm being processed is a short culm, the middle sensor 5 is OFF and the upper sensor 4 is not energized, so the upper sensor 4 does not issue a long culm signal and the relay 11 Since there is no input to the sensor, it is grounded, and since the intermediate sensor 5 is OFF, the negative circuit 7 outputs and the relay 9 is activated, and the motor 6 rotates in the A direction to operate the handling depth adjustment device. Treat it thoroughly and operate the adjustment.

Note that 12 and 12 in the drawing are timers.

As described above, the present invention provides a combine harvester in which a plurality of ear tip detection sensors are installed in the ear transfer path, and a handling depth adjustment device is automatically controlled by a control circuit including the ear tip detection sensors. They are connected in series and inserted into the control circuit so that the one located on the side takes priority, so when the harvested grain culm is short and needs to be treated lightly, the ear tip sensor located on the ear side detects weeds, straw, etc. Even if the culm is entangled and it is ON, if the tip sensor located on the stock side is also OFF, the tip sensor on the tip side will not emit a long culm signal, and the handling depth adjustment device will not be used properly. It can be adjusted and operated, and does not result in extremely shallow handling and unhandled parts, unlike in the case of conventional parallel-type spear tip sensors.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention,
Figure 1 is a rear view of the combine harvester's culm length detection unit, Figure 2
The figure is a control circuit diagram, and FIG. 3 is a conventional control circuit diagram. 1... panicle side conveyor, 4... upper sensor, 5...
...Medium sensor, 8,10...transistor,
9,11...Relay.

Claims (1)

[Scope of utility model registration request] In a combine harvester in which a plurality of ear tip detection sensors are provided in the ear portion transfer route and a handling depth adjustment device is automatically controlled by a control circuit including the ear tip detection sensors, priority is given to a combine harvester in which the tip sensor is located on the side of the stock. A working depth sensor for a combine harvester, characterized in that the handling depth sensor is connected in series and inserted into the control circuit so as to be connected in series.