JPS5934819A - 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.

The automatic cutting height adjustment device detects the height of the cutting section above the ground and raises and lowers the cutting section to keep the cutting height within a certain range. Once manual adjustment is performed, automatic adjustment is prohibited for safety reasons.

This is because, for example, when the reaping section is manually adjusted to raise the reaping section for accompanying purposes, if the automatic adjustment is not released, the automatic adjustment will operate after the manual adjustment and the reaping section will descend.
There is a risk that a very dangerous situation may occur, such as the cutting part sticking into the soil, and such dangers cannot be avoided.

However, when harvesting is performed using automatic adjustment, even if you manually make fine adjustments to the cutting height, the automatic cutting height adjustment will be canceled, and in order to return to automatic adjustment, you will need to switch the automatic return switch. etc. operations were required.

In particular, if the reaping section is configured to rise for a certain period of time when the reaping latch is shut off during automatic adjustment, the automatic adjustment will be canceled after manual fine adjustment, and even if the reaping latch is shut off, the reaping section will rise for a certain period of time. There was a great risk that the elevation of the area would not be carried out, leading to dangerous small parts.

The present invention was made in 62t under such circumstances, and when manual adjustment of the cutting height is performed during automatic cutting height adjustment, priority is given to the manual adjustment operation mode. For example, depending on the amount of rotation of the manual cutting height adjustment lever, or depending on the length of rotation time of the manual cutting height adjustment lever, automatic adjustment is canceled or manual adjustment is performed. The purpose of the present invention is to provide a harvesting machine that improves workability and safety by returning to automatic adjustment after the end of operation. The present invention will be described in detail below based on drawings showing embodiments thereof.

FIG. 1 is a schematic side view of a harvester according to the present invention, and FIG. 2 is a hydraulic circuit diagram of the main parts thereof. In the figure, K indicates a cutting section, which is composed of a divider 1, a culm lifting device 2, a cutting blade 8, and the like. As shown in FIG. 2, the reaping section is supported via a support frame 4 so as to be movable up and down about an axis 5 at the front of the machine, and a hydraulic cylinder is interposed between the machine body and the support frame 4. The entire yacht reaping section moves up and down relative to the fuselage in response to the forward and backward movement of the piston rondro a of No. 6, thereby changing its height above the ground. The control of this hydraulic cylinder 6 is performed by an electromagnetic directional control valve (2). When the solenoid Su is energized, the electromagnetic directional control valve V is switched to the position shown by U, and the pressure oil from the hydraulic pump P is supplied to the hydraulic cylinder 6. When the piston rod 6a is advanced and the solenoid Sd is energized, the electromagnetic directional control valve V
is switched to the position shown by d, the pressure oil in the hydraulic cylinder is released, and the piston rod 6a is retracted.

Energization control for both solenoids Su and Sd of the electromagnetic directional control valve V is performed by a cutting height sensor 7 as shown in FIGS. 1 and 2.
or by rotating the lifting lever 81 on the reaping section arranged on the front panel F in front of the driver's seat U. The cutting height sensor 7 detects the cutting part K within a certain range.
The device is for automatically adjusting the cutting height relative to the grain culm by raising and lowering the
Its base end is rotatably supported in a sensor box 7a attached to the sensor box 7a, and its tip is slidably in contact with the ground surface by its own weight or by using a predetermined attachment means, and the sensor box 7R is perpendicular to the ground surface. The rotation angle changes depending on the distance, and the two photoelectric switches U and 7d (see FIG. 4) in the sensor box 7a are selectively operated, and both solenoids Su of the electromagnetic directional control valve V are activated.

Electricity is applied to either Sd to control the elevation of the reaping section.

FIGS. 8(A) and 8(B) are a schematic side view and a schematic front view of the area around the lifting lever 81 in the reaping section, respectively. The elevating lever 81 is rotatably supported on a shaft 82, and a light shielding plate 88 integrated with the elevating lever 81 is attached below the shaft support. The light-shielding plate 88 has a fan shape that expands at the bottom.
Eight photo interrupters 9 are provided in the rotation area of the light shielding plate 88.
d, 9c, and 9u are on the front side (right side in Figure 8 (a))
From 9d, 9c.

They are provided in the order of 9 u. Each photo interrupter 9
(1, 9c, 9u have a structure in which the light emitting and light receiving elements face each other with a fixed interval, and there is a light shielding plate 88 between the pixel elements.
The light shielding plate 88 detects the change in the amount of light caused by the passage of light, and the light shielding plate 88 blocks the light rays between the pixel elements, making it inactive. When the central photointerrupter 9C is deactivated and the lift lever 81 is tilted slightly forward (or backward), the central photointerrupter 9C and the rear photointerrupter 9u (or the front photointerrupter 9d) are deactivated. When tilted further forward (or backward), only the photo interrupter 9u (or 9d) is inactivated. Therefore, when the elevator lever 81 is not operated and stands upright, the central photo interrupter 9c is turned off. The photointerrupters 9d and 9u are inactive, and when the lifting lever 81 is slightly tilted forward (or backward), the central photointerrupter 9d and 9u are activated, as shown by the two-dot chain line in FIG. 8(a). 9C and the rear photo interrupter 9u (
Otherwise, both the front photo interrupters 9d) become inactive, and as described later, they intermittently descend (or rise) to the reaping section, and when the lifting lever 81 is further rotated forward (or backward), the rear (or Only the photointerrupter 9u (or 9(1) on the front side) is inactive, the other two photointerrupters are activated, and the 4th The figure shows an electronic circuit diagram of the main parts of the machine of the present invention. A key switch 12 whose negative pole is connected to the positive pole of a battery 11 whose negative pole is grounded to the body is connected to a solenoid Su of an electromagnetic directional control valve ■ through a switch circuit 18u. , and is also connected to the solenoid Sd via the switch circuit 18cl.

Further, the key switch 12 is a terminal formed by collectively connecting one end (light emitting element side) of the photoelectric switches 7 u and 7 d of the cutting height sensor 7 and the photo ink converter 91 described above.

One end of each of 9c and 9C1 (on the light emitting element side) is connected to a terminal formed collectively. Furthermore, key switch 12
is a power supply terminal a1 of the control unit 10, which will be described later, through a series circuit of a threshing switch 14 that is activated when the threshing clutch is engaged, and an automatic switch 15 that is operated when the cutting height is adjusted in automatic mode. It is connected to the.

Other ends of photoelectric switches 7 u and 7 d (light receiving element side)
are connected to input terminals a2 and a3 of the control unit 10 via smoothing circuits 16 and 17, respectively. Smoothing circuit 16
．． 17 is an optical m switch 7u in order to prevent the cutting height sensor 7 from operating due to footprints, stumps, etc. on the field and causing erroneous control.
, 7d, the control unit 1O is a photoelectric switch 7u in the cutting height sensor 7 that is in contact with the ground surface.
The cutting height can be detected by capturing the 7d signal.

The other end of the photo ink converter 9u (light receiving element side) is AND
connected to the negative logic input terminal of the gate 21, and
It is connected to the negative logic input terminal of gate 28. The other end (light-receiving element side) of the photointerrupter 9C is the positive logic input terminal of the ANI) gate 21, the positive logic input terminal of the AND gate 22, the negative logic input terminal of the AND gate 23, and the negative logic input terminal of the AND gate 24. The other end (light-receiving element side) of the photo ink converter 9d is connected to the negative logic input end of the AND gate 22 and to the negative logic input end of the AND gate 24.

The output of the A N D gate 21 is applied to the negative logic set terminal S of the R-S flip-flop 20 via the diode 18 and the inverter 25, and is also applied to one input terminal of the switch circuit 18u and the OR gate 29 described above. It is given. The output of the AND gate 22 is connected to the diode 19
The signal is applied from the inverter 25 to the negative logic set terminal S of the R-S flip-flop 20 via the inverter 25, and also to one input terminal of the switch circuit 18d and the OR gate 28. The output of AND gate 23 is A
N I) serves as the sole power of gate 27 and is applied to the other input terminal of OR gate 29,
I) The output of the gate 24 serves as an input to the AND gate 26 and is also applied to the other input terminal of the OR gate 28.

The other input of each A N +) gate) 26.27 is a pulse signal oscillated by a pulse oscillator 88 connected to the positive electrode line of the battery 11, and the output of the AND gate 26 is given to the switch circuit 1 ad . A N I) The output of the gate 27 is given to the switch circuit 18u.

Negative logic reset terminal R of the R-S flip-flop 20
is connected to the positive electrode line of batch IJ 12, and is also connected to an automatic return switch 31 which returns to automatic mode after switching to manual mode during automatic mode via a resistor.
It is connected to a parallel circuit with the first normally open contact 801 of the reaping switch, which is activated when the reaping latch is in the disconnected state and deactivated when it is in the connected state, and the parallel circuit is grounded to the body. . The output terminal Q of the R-S flip-flop 20 is connected to the input terminal a4I of the control section 10. The input terminal a6 of the control unit IO is connected to the positive electrode line of the battery 12, and is connected to the reaping switch 80.
The body is grounded via the second normally open contact 302 of the body. Furthermore, the eighth normally open contact 808 of the reaping switch 80 is connected to the positive electrode line of the battery 11 and an AND gate 89 which will be described later.
It is interposed between one input terminal of the

The control unit IO controls the respective output terminals in a manner as described below.
33, which outputs a high level signal, and is composed of a microcomputer.

When the cutting height adjustment is in the automatic mode, the output terminal b1 of the control unit IO is a photoelectric switch 7u for raising the cutting height sensor 7 when the cutting part K is below the dead zone.
It outputs a high level signal when activated, and this output is given to the switch circuit 18u.

The output terminal b2 of the control unit 12 outputs a high-level signal when the cutting height adjustment is in the automatic mode, and this output signal is given to the switch transistor 86 to operate it, indicating that the cutting height adjustment is in the automatic mode. Automatic lamp 25 that notifies
lights up. Furthermore, the high level signal generated by the operation of the switch transistor 86 is transmitted to A via the off-delay circuit 88.
It is applied to the other input terminal of the ND gate 89.

The output terminal b3 of the control unit IO is set to a high level when the mowing height adjustment is in the self-mh mode and the mowing part K is above the dead zone and the photoelectric switch 7d for lowering the mowing height sensor 7 is activated. It outputs a signal, and the output is given to the switch circuit 18d.

In the machine of the present invention configured as described in Section 2, the cutting height can be adjusted using the automatic mode using the cutting height sensor 7 and the lifting lever 81.
Both manual modes are possible with 1. First, let's explain about manual mode: key switch 1
When the threshing clutch and the reaping latch are turned on, the threshing switch 14 and the reaping switch 30 are turned on.
Furthermore, when the automatic switch 15 is turned on to set the automatic mode, the control section 10 outputs a high label signal from the output terminal b2, turns on the switch transistor 36, and lights up the automatic lamp 87 to indicate that the automatic mode is selected. The cutting height sensor 7 automatically adjusts the cutting height. In other words, when the height of the reaping part (above the ground) deviates from the dead zone and becomes less than a predetermined value (or less), the photoelectric switch 7u (or 7d) is activated.
is turned on, and the control unit 1() output terminal 1)+(or 1)3
) outputs a high level signal from switch circuit 18u.
(or 18d) and turn on the solenoid Su (or Sd
) is excited.

As a result, the magnetic force direction control valve V is switched, and the rod 6a of the hydraulic cylinder 6 advances (or retracts) and moves up (or down) to the reaping section.

When the cutting height is adjusted in automatic mode and the cutting latch is cut off to change the heavy speed, etc., the cutting switch 80 is activated and its second normally open contact 802 is closed. The input terminal a5 of the control unit 1o becomes low level, and the cutting height adjustment in the automatic mode is canceled. As a result, the output terminal b2 of the control unit 10 becomes low level and the automatic lamp 37 is turned off, but the off-delay circuit 88 outputs a high level signal to one terminal of the AND gate 89 for a predetermined period of time. On the other hand, the operation of the reaping switch causes the eighth
The normally open contact 803 of the CAND gate 89 is also closed, and a high level output is given to the other terminal of the CAND gate 89, and the A N I) gate 89 outputs a high level signal to the switch circuit 18u for a predetermined period of time. Turn on and solenoid So
is excited to raise the reaping part (1) over a predetermined period of time.In other words, this is to prevent the cutting blade from digging into the soil etc. when turning after one stroke. In this case, as long as the reaping latch remains closed, the reaping section continues to rise, and when the reaping latch is engaged and the reaping switch is deactivated, the automatic mode is restored.

Further, in the cutting height adjustment of the machine of the present invention, priority is always given to the manual mode by operating the lift lever 81. That is, when the lifting lever 81 is slightly tilted forward (or backward), the central photo-interrupter 9c and the rear (or front) photo-interrupter 9u (or 9d) are deactivated, and the AND
The output of gate 28 (or 24) becomes high level. As a result, the output of the OR gate 29 (or 28) also becomes high level, activating the switch circuit 85 (or 84), deactivating the switch circuit 18d (or 18u), demagnetizing the solenoid Sd (or Su), and increasing the cutting height. It is prohibited to lower (or raise) the cutting section by automatic adjustment. On the other hand, A
A by high level output of ND gate 28 (or 24)
The ND gate 27 (or 28) outputs a high-level signal in synchronization with the high-level signal of the pulse oscillator 88, and intermittently operates the switch circuit 18u (or 18d) to turn on and off the solenoid Su (or Sd). Therefore, the reaping section K is intermittently raised (or lowered). In this case, in the automatic mode, the Q output of the R-S flip-flop 20 remains at a low level as described later, so the input port a4 of the control unit 10 remains at a low level, and the automatic mode is canceled. First, when the elevator lever 81 is placed in a neutral state (that is, in an upright state where only the central photointerrupter 9c is inactive), the cutting height is adjusted in automatic mode using the cutting height sensor 7.

Therefore, when the lift lever 81 is tilted forward (or backward), only the rear (or front) photointerrupter 9u (or 9d) is inactivated, and the other two photointerrupters 9c, 9d (or 9u) are inoperative. ) is activated, AND gate 2
The output of 1 (or 22) becomes high level. As a result, the output of the OR gate 29 (or 28) becomes high level, the switch circuit 85 (or 84) is activated, the switch circuit 18d (or 13u) is deactivated, and the solenoid Sd (or Su) is demagnetized. At the same time, the switch circuit 18u (or 18d) is activated and the solenoid S
u (or Sd ) is excited and continuously rises (or falls) to the reaping section.

Furthermore, the high level output of the AND gate 21 (or 22) is connected to the inverter 25 via the diode 18 (or 19).
is inverted and becomes a low level, the set terminal S input of the R-S flip-flop 20 becomes a low level, the Q output becomes a low level, and therefore the input terminal 24 of the control unit IO becomes a low level. Cancel cutting height adjustment in automatic mode. If you want to return the cutting height to the automatic mode again after the operation lever 81 has continuously raised and lowered the cutting section, either operate the automatic return switch 82 or cut off the cutting latch and actuate the cutting switch 80. By closing the first normally open contact 801 and setting the reset terminal R of the R-S flip 70 knob 20 to a low level, the R-S flip-flop becomes a reset state and the Q output becomes a high level, resulting in a cutting height. Adjustment returns to automatic mode.

In this way, in the machine of the present invention, even when the mowing height adjustment is in the automatic mode, the manual mode can be set by manually operating the lift lever 81. However, when the tilt angle of the lift lever 81 is small, , the lifting and lowering of the reaping section is performed intermittently, and after the operation of the lifting lever 81 is completed, the mode returns to automatic mode again, and when the tilting angle of the lifting lever 81 is large, the lifting and lowering of the reaping section is carried out intermittently. This is done continuously, and the automatic mode is not returned even after the lifting lever 81 is raised or lowered.

Therefore, even if the cutting height is manually finely adjusted in the automatic mode, the machine of the present invention returns to the automatic mode without canceling the automatic mode, so there is no need to operate the automatic return switch, etc., and the automatic Even if the reaping latch is cut off because the return switch is not operated, the reaping part K does not rise, and the cutting blade does not plunge into the soil. Furthermore, fine manual adjustments to the cutting height are made intermittently, allowing for precise adjustments.

FIG. 5 is an electric circuit diagram showing another embodiment of the present invention,
If the lowering lever is operated for a long time, cancel automatic adjustment.
If the time is short, a return to automatic adjustment is performed after the manual adjustment operation is completed. In the figure, the circuit for automatic cutting height adjustment has the same configuration as the previous embodiment, but the circuit for manual cutting height adjustment is arranged on the front panel F in front of the driver's seat U. The reaping section is raised and lowered using manual switches 41u and 41d for raising and lowering commands.

41d are respectively switch circuits 85.41d similar to those in the previous embodiment.
84 and to the switch circuit 1B+1°18d, and when the manual switch 41u (or 41d) for raising (or lowering) command is operated, the switch circuit 85 (or 84) is operated, and the switch circuit 18d is connected to the switch circuit 18d. (or 1B+1) is deactivated, solenoid Sd (or Su) is demagnetized, and switch circuit 18u (or 18d) is activated to activate solenoid Su (or Sd).
is excited and the reaping part is upper Jj! , (or descend).

On the other hand, manual switch 4111゜41 for raising and lowering commands
6 are collectively connected to an on-delay circuit 42 through diodes 18 and 19, respectively, and the output of the on-delay circuit 42 serves as the 10 input of a comparator 48. A predetermined potential determined by a resistor 44 interposed between the positive electrode of the battery 11 and the body ground is inputted to the comparator 48, and the output of the comparator 4B is outputted via the inverter 25 as described above. A negative logic set signal is applied to the S terminal of the R-S flip-flop. Other components similar to those in the above-described embodiment are designated by the same reference numerals, and description thereof will be omitted.

In this embodiment, manual switches 4111°41d
If either operation is shorter than the time determined by the on-delay circuit 42, the output of the comparator 48 remains low level, so the set terminal S input of the R-S flip-flop 20 becomes high level, and the R -The Q output of the S flip-flop 20 remains at a high level, and the automatic mode is not released.

However, if the operation of either the manual switch 41u or 41d continues for a longer period of time than the time determined by the on-delay circuit 42, the output of the comparator 48 becomes 1 level, and the manual input of the set terminal S of the R-S flip-flop 20 occurs. becomes a low level, its Q output becomes a low level, and the automatic mode is canceled. In this way, in the second embodiment, the automatic mode is released or not released depending on whether the manual switches 41u or 41d are operated for a long time or a short time.

As described in detail above, the present invention provides a harvester equipped with an automatic cutting height adjustment device that raises and lowers the cutting part according to the output of a sensor that detects the height of the cutting part above the ground. When a manual adjustment operation is performed, priority is given to the manual adjustment, while automatic adjustment is canceled or a return to automatic adjustment is performed after the manual adjustment operation is completed, depending on the mode of the manual adjustment operation. Because it is a reliable and safe harvester, it is possible to create a harvester with excellent reliability and safety.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a schematic side view of the machine of the present invention, FIG. 2 is a schematic diagram showing the hydraulic circuit of the main part of the machine of the present invention, and FIG. ) and (0) are respectively a schematic side view and a front view of the vicinity of the lifting lever, FIG. 4 is a diagram of the main part of the electronic circuit of the machine of the present invention, and FIG. 5 is a main part of the electronic circuit showing another embodiment of the present invention. It is a diagram. DESCRIPTION OF SYMBOLS 1... Divider, 1a... Support rod, 6... Hydraulic cylinder, 7... Cutting height sensor, 7u, 7d... Photoelectric switch, 9 u, 9 d, 9 c... Photo Incluctor, 10 Control unit, 16.17... Smoothing circuit, 20... R-S free knob flop, 21, 2
2,28,24°26.2.7.89...AND gate, 28. 29...OR gate, 80...Reaping switch, 83...Pulse oscillator, 88...Off delay circuit, 41u, 41d...Manual switch, 42
...On-delay/child circuit, K...Reaping section, ■...Solenoid directional control valve, Su, Sd...Soleno/F. Patent applicant Yanmar Agricultural Machinery Co., Ltd. Agent Patent attorney Tomio Kono (Ron!!J 3121 115-

Claims (1)

[Claims] 1. In a harvester equipped with an automatic cutting height adjustment device that raises and lowers the cutting part according to the output of a sensor that detects the height of the cutting part above the ground, manual adjustment of the cutting height was performed during automatic cutting height adjustment. A harvesting machine characterized by having a configuration in which manual adjustment is prioritized in some cases, while automatic adjustment is canceled depending on the manual adjustment operation mode, or automatic adjustment is returned to after the manual adjustment operation is completed.