JP4107591B2 - Mowing harvester - Google Patents

Description

  The present invention includes a grounding sensor bar supported by a weeding frame of a pre-cutting processing unit so as to swing up and down, a detection mechanism for detecting a swinging angle of the grounding sensor bar with respect to the weeding frame, and a forward transmission state. The present invention relates to a harvesting and harvesting machine provided with a traveling transmission that can be shifted between a neutral state and a reverse transmission state.

The above harvesting and harvesting machine can control the height of the ground before the cutting processing unit based on the detection result by the detection mechanism, for example, to control the height of the cutting and cutting by the processing unit before cutting. Is.
In this type of harvesting and harvesting machine, conventionally, as shown in Patent Document 1, for example, a speed change operation lever 5 for steplessly changing the forward and backward movement of the machine body is provided, and a ground contact 4A (corresponding to a grounding sensor bar) is provided as a shaft. A sensor box 4B, which is connected so as to be swingable up and down around the core a, is pivotally attached to an attachment member 6A of the weed support rod 2E so as to be swingable around the shaft core a, and the sensor box 4b is rocked by a spring 6B. The ground contact 4A is biased to the ground contact action posture, the sensor box 4B is interlocked with the shift operation lever 5 via the wire 6C, and the shift lever 5 is moved from the forward operation region F or the neutral operation position N. When operated in the reverse operation region R, the ground contact 4A is switched from the ground contact acting posture to the non-acting posture retracted above the weed support rod 2E against the spring 6B. There was what was is.

Japanese Utility Model Publication No. 58-41798 (columns 3, 4 and 2)

  If the grounding sensor bar automatically switches from the descending grounding state to the ascending ground floating state when the aircraft is operated in reverse, the conventional technology described above is adopted and the traveling transmission is switched to the reverse transmission state. The ground sensor bar is raised. For this reason, when the aircraft starts to move backward, the ground sensor bar has not yet risen to the ground-floating state, and depending on the ground conditions, such as a lump or stump protruding on the ground, the sensor bar may There was a case of being caught on the ridge.

  An object of the present invention is to provide a harvesting and harvesting machine that can prevent the grounding sensor bar from being caught in a more reliable state while the grounding sensor bar is raised only by operating the aircraft backward. is there.

In the first aspect of the present invention, a pre-cutting processing unit that can be adjusted up and down is mounted on the self-propelled aircraft, and the self-propelled aircraft is capable of shifting operation in a forward transmission state, a neutral state, and a reverse transmission state. A grounding sensor bar provided with a transmission and supported by the weeding frame of the pre-cutting processing unit so as to swing up and down, a detection mechanism for detecting a swinging angle of the grounding sensor bar with respect to the weeding frame, and a detection mechanism; In the harvesting and harvesting machine provided with the cutting height control device that adjusts the height of the ground before the cutting processing so that the predetermined cutting height is maintained based on the detection result of
It said ground sensor bar, lift switched freely form structure on the elevated ground floating state and a lowered ground state,
When the traveling transmission is switched to the forward transmission state, the ground sensor bar is switched to the descending grounding state, and the traveling transmission is switched to either the neutral state or the reverse transmission state. Stop the cutting height control by the cutting height control device, and the ground contact sensor bar is located above the horizontal extension line of the lower end of the weeding tool attached to the tip side of the weeding frame. to switch to the floating state, by linking the switching of the travel gear device is provided with a continuous engagement operation means that to operate switches the ground sensor bar.

  That is, the vehicle body moves backward by switching the traveling transmission device to the reverse transmission state through the neutral state. In addition, regardless of whether the traveling transmission is switched between the neutral state and the reverse transmission state, the grounding sensor bar is switched to the ascending ground floating state by the linkage operation means. When the gearshift operation is performed, the grounding sensor bar naturally rises from the descending grounding state to the ascending ground floating state. Moreover, the sensor bar starts to rise from the descending grounding state when the traveling transmission is in a neutral state, and the sensor bar has already been elevated when the traveling transmission is in a reverse transmission state and the aircraft starts to reverse. The sensor bar can be lifted automatically as if it is in an actuated state or reached a state of rising to ground.

  Therefore, according to the first aspect of the present invention, when the shifting operation of the traveling transmission is performed, the grounding sensor bar naturally rises, and a special operation for raising the sensor bar is not necessary. Start the reverse of the aircraft while the server is in the ascending operation or the state of rising to the ground, and reverse while effectively avoiding the grounding sensor bar from being caught or deformed by the ground or bump Can do.

  In the second aspect of the invention, in the configuration of the first aspect of the invention, the linkage operating means is linked to a work clutch that turns on and off the transmission to the pre-cutting processing unit, and the work clutch is switched to the on state. When the traveling transmission is switched to the forward transmission state, the ground sensor bar is switched to the descending ground state, and when the working clutch is switched to the disconnected state, the shifting state of the traveling transmission is prioritized. The grounding sensor bar is configured to be switched to the ascending ground floating state.

  That is, when the working clutch is switched to the engaged state and the traveling transmission is switched to the forward transmission state, the grounding sensor bar is switched to the descending grounding state by the linkage operation means, and the work travels while the grounding sensor bar is grounded. Can do. When the work clutch is switched to the disengaged state, the grounding sensor bar is switched to the ascending ground floating state by the linkage operation means regardless of the speed change state of the traveling transmission, and the mobile sensor travels while the grounding sensor bar floats from the ground. be able to.

  Therefore, according to the second aspect of the invention, if the pre-cutting processing unit is operated to stop when moving, the grounding sensor bar will naturally rise to the ground-floating state, so that it does not take the trouble of operating the grounding sensor bar to ground. It is possible to run while floating on the ground so that the ground sensor bar does not deform or break when hitting the ground.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a boarding type driving unit that is self-propelled by a crawler type traveling device 1 and equipped with a driving seat 2, and a driving unit that includes an engine (not shown) located below the driving seat 2. The base end side of the pre-processing unit frame 11 of the pre-cutting processing unit 10 is connected to the front part of the body frame 3 of the self-propelled machine body having a pivot so as to be rotatable around the horizontal axis of the body, and the pre-processing unit frame 11, a lift cylinder 8 is connected via a link mechanism 7, and a threshing device 5 and a grain tank 6 are provided on the machine body frame 3 to constitute a combine.

  This combine harvests grains such as rice and wheat, and when the hydraulic lift cylinder 8 is operated, the lift cylinder 8 swings the pretreatment unit frame 11 up and down to perform pre-cutting processing. The unit 10 is moved up and down to a work position that is lowered to near the ground and a lifted non-work position that is elevated above the ground. When the pre-cutting processing unit 10 is moved to the descending work position and the self-propelled machine is driven, the pre-cutting processing unit 10 arranges the planting stems to be cut of the plurality of planting strips in the horizontal direction of the machine body. , And guided to the corresponding one of the plurality of pulling devices 13 arranged in the horizontal direction of the machine body, and is raised and processed by the lifting claws (not shown) of each pulling device 13 to move upward and the clipper type. The threshing feed chain of the threshing device 5 is chopped by the reaping device 14 and conveyed to the rear side of the machine body by the conveying device 17 composed of the nipping and conveying device acting on the stock side and the latching conveying device acting on the tip side. It supplies to the start part of 5a. The threshing device 5 sandwiches the stock side of the harvested cereal by the threshing feed chain 5a and conveys it toward the rear of the machine body, and supplies the tip side to a handling room (not shown) for threshing treatment. The grain tank 6 collects and stores the threshed grains from the threshing device 5.

The mowing unit 10 will be described in further detail as shown in FIGS.
That is, a main frame 11a composed of a transmission case facing the front and rear of the machine body whose base end side is rotatably connected to the front part of the machine body frame 3, and a machine body having an intermediate part connected to the distal end of the main frame 11a. The pre-processing unit frame 11 is configured by a lateral transmission case 15 or the like. The weeding frame 16 is extended forward from the plurality of locations in the lateral direction of the body of the support member 15a provided in the lateral transmission case 15, and the grain is raised by a pair of adjacent weeding frames 16 to cause the grain culling. 18, the weeding tool 12 is fixed to the tip of each weed frame 16, the grain raising unit 13 is provided on the side of each grain raising path 18, and the plurality of weed frame 16 The cutting device 14 is attached over the proximal end.

As shown in FIG. 2 and the like, the ground sensor bar 21 is used for the ground slightly behind the weeding tool 12 located on the outermost side of the aircraft among the plurality of weeding tools 12 of the pre-cutting processing unit 10. the height detector 20 is provided, as shown in FIG. 7, the control unit 30 as a linking operation means is associated with the detection mechanism 22 of the ground height detecting device 20, the solenoid of the control valve 31 of the lift cylinder 8 The cutting height setting means 32 provided in the operation unit and the operation unit is linked.

FIG. 3 shows a state in which the grounding sensor bar 21 is swung downward with respect to the transmission case 25 around the horizontal axis X located on the front end side of the machine body with a solid line, and the grounding sensor bar 21 is a transmission case with a two-dot chain line. The grounding sensor bar 21 is swung up and down with respect to the transmission case 25 around the axis X so that the grounding sensor bar 21 is grounded at the rear end side of the grounding sensor bar 21. The action part 21a projects from the extension line L at the lower end of the weeding tool 12 to the lower side of the fuselage, and the grounding sensor bar 21 is located at a height higher than the extension line L. It is configured to be able to switch up and down to the rising ground floating state U that does not come in contact with the ground. As shown in FIG. 8 and the like, the electric sensor lifting / lowering motor 71 configured to switch the grounding sensor bar 21 between the descending grounding state D and the ascending ground floating state U via the operation cable 70 or the like is used. provided 10 top of, as shown in FIG. 7, Oh Ru by the sensor elevating motor 71 is linked to the control means 30.

  As shown in FIG. 7, a hydrostatic type that converts the driving force of the engine into a driving force on the forward side and the reverse side, and transmits the driving force to the traveling device 1 in a stepless manner on both the forward side and the reverse side. A shift detection means 35 interlocked with a shift lever 81 provided in the driving unit so as to shift the traveling transmission 80 formed of a continuously variable transmission, and a belt tension for switching transmission from the engine to the pre-cutting processing unit 10 A clutch detection means 36 configured to act on a work clutch lever 83 provided in the operating section so as to turn on and off a work clutch 82 formed of a clutch is linked to the control means 30.

  The cutting height setting means 32 is composed of a potentiometer that can be operated manually, and sets the cutting height of the cutting device 14 to be maintained by cutting height control so that the cutting height can be changed. It outputs to the means 30.

  The shift detection means 35 is composed of a rotary potentiometer whose rotational operation shaft is interlocked with the base of the shift lever 81. The shift lever 81 is a neutral position S for shifting the travel transmission 80 to a neutral state. It is detected which operating position or operating range of the forward range F where the device 80 is shifted to the forward transmission state and the reverse range R where the traveling transmission device 80 is shifted to the reverse transmission state. An electric signal is output to the control means 30.

  The clutch detection means 36 comprises a detection switch that is turned on and off by the work clutch lever 83, detects whether or not the work clutch lever 83 has been operated to the on position, and uses the detection result as an electrical signal to control the means. 30 is output.

The control means 30 is configured using a microcomputer, and the cutting height for automatically operating the lift cylinder 8 based on the detection information by the ground height detection device 20 and the setting information by the cutting height setting means 32. Control is to be executed.
That is, based on the detection information by the ground height detection device 20, the ground height of the pre-cutting processing unit 10 is detected as the ground height of the reaping device 14, and this detected reaping device ground height is the cutting height setting means 32. When the cutting height deviates from the set cutting height, the control valve 31 outputs a signal to operate the lift cylinder 8 to operate the lift cylinder 8 to the ascending side or the descending side of the cutting portion 10. A signal to stop the lift cylinder 8 from the control valve 31 when the height of the detected cutting device to the ground becomes the detected height of the cutting device corresponding to the cutting height set by the cutting height setting means 32. Is output to stop the lift cylinder 8 and stop the ascent and descent of the pre-cutting processing unit 10.

  The control unit 30 determines whether the traveling transmission 80 is switched to the forward transmission state, the neutral state, or the reverse transmission state based on the detection result of the shift detection unit 35, and the detection result of the clutch detection unit 36. Based on this, it is determined whether the work clutch 82 has been switched to the engaged state or the disengaged state, and the sensor lift motor 71 is operated based on the results of both determinations to raise the ground sensor bar 21 to the lowered ground state D. Switching to the ground floating state U is performed.

  That is, as shown in FIG. 10, it is determined that the travel transmission 80 is switched to the forward transmission state based on the detection result by the shift detection means 35, and the work clutch 82 is based on the detection result by the clutch detection means 36. When it is determined that the sensor has been switched to the on state, the sensor lifting motor 71 is driven to the sensor lowering side until the lower limit switch 37 is in the detection state, and the ground sensor bar 21 is switched to the lowering ground state D. In this case, the cutting height control is turned on so that the cutting height control is executed based on the detection results of the clutch detection means 36 and the shift detection means 35.

  Even when it is determined that the traveling transmission 80 is switched to the forward transmission state, if it is determined that the work clutch 82 is switched to the disengaged state based on the detection result by the clutch detection unit 35, the shift detection unit 35 is also used. When it is determined that the travel transmission 80 has been switched to the neutral state based on the detection result of, and when it is determined that the travel transmission 80 has been switched to the reverse transmission state, the work clutch 82 is switched to the engaged state. Even when it is determined that the work clutch 82 has been switched to the disengaged state, the sensor raising / lowering motor 71 is driven to the sensor ascending side until the detection mechanism 22 reaches the predetermined elevation detecting state, and the ground sensor bar is operated. 21 is switched to the rising ground floating state U. In these cases, the control means 30 is in a cutting height control off state so as to stop the cutting height control based on the detection results by the shift detection means 35 and the clutch detection means 36.

  As a result, when the harvesting operation is performed with the control means 30 switched on, the transmission lever 81 is operated to the forward travel region F, the travel transmission 80 is switched to the forward transmission state, and the work clutch lever 83 is brought into the engaged position. Since the operation clutch 82 is switched to the engaged state by operating, the control means 30 is linked with the switching of the traveling transmission 80 to the forward transmission state and the switching of the work clutch 82 to the engaged state. The ground sensor bar 21 is switched to the descending ground state. Then, the control means 30 is turned on based on the detection results of the shift detection means 35 and the clutch detection means 36, and the detected cutting device height by the ground height detection device 20 is the cutting height setting means. Cutting height control for automatically raising and lowering the pre-cutting processing unit 10 so as to obtain the set cutting height by 32 is executed. Thereby, even if the self-propelled aircraft tilts in the front-rear direction due to unevenness or inclination of the traveling ground, the ground height of the reaping device 14 is maintained at or close to the set height, and the height of the stump is set. You can work while keeping it close or close.

  When the self-propelled machine body travels backward, the speed change lever 81 is operated to the reverse position R through the neutral position S, and the travel transmission 80 is switched to the reverse transmission state through the neutral state. Regardless of whether the travel transmission 80 is switched to the neutral state or the reverse transmission state, the control means 30 links the ground sensor bar 21 to the neutral state or the reverse transmission state of the travel transmission 80. Switch to the ascending ground-floating state. As a result, the grounding sensor bar 21 is lifted from the descending grounding state when the traveling transmission 80 is in the neutral state simply by operating the transmission lever 81 to switch the traveling transmission 80 to the reverse transmission state. First, when the traveling transmission 80 is in the reverse transmission state and the aircraft starts to reverse, the ground sensor bar 21 is already in a state where the ground sensor bar 21 has already been lifted or has reached the rising ground floating state. As a result, the ground sensor bar 21 can be moved backward while being difficult to be caught on the ground or its raised portion.

  When the self-propelled machine body is traveled without working, the work clutch lever 83 is operated to the disengaged position and the work clutch 82 is switched to the disengaged state. In this case, the control means 30 switches the ground sensor bar 21 to the ascending ground floating state in preference to the shifting state of the traveling transmission device 80 even if the traveling transmission device 80 is shifted to the forward transmission state or the reverse transmission state. It is possible to drive the vehicle while making it difficult to catch the ground sensor bar 21 on the ground.

  The raising / lowering lever 34 shown in FIG. 7 is provided so as to be manually operated by the driving unit, and when operated, outputs a command for raising or lowering the pre-cutting processing unit 10 to the control means 30, thereby It is to raise and lower. That is, the pre-cutting processing unit 10 is manually raised and lowered. When the lifting / lowering lever 34 is operated to input an ascending / descending command, the control means 30 switches the control valve 31 in preference to the detection result by the ground height detection device 20 to cut the lift cylinder 8 before the cutting process. 10 is operated to the ascending side and descending side.

  The ground height detection device 20 will be described in more detail. As shown in FIGS. 2 and 3 and the like, the ground height detection device 20 is the side of the plurality of weeding tools 12 on which the operating unit is located. The transmission case 25 as a sensor support member connected to a sensor support portion 16b located near the rear side of the weeding tool 12 of the weeding frame 16 that supports the weeding tool 12 located on the opposite side of the machine body on the outermost side. The lower side surface of the transmission case 25 includes the grounding sensor bar 21 connected to the front end side, and the detection mechanism 22 attached to the outer surface of the upper side wall of the transmission case 25. is there.

  As shown in FIGS. 2 and 3, the weeding frame 16 includes a weeding frame main body 16a made of a round steel pipe having a rear end connected to the support member 15a of the transmission case 15, and the weeding frame main body 16a. Sensor support made of a bent round bar that has a straight portion on the rear end inserted into the front end and is fixed by a set bolt 19 and is connected to the weed frame main body 16a so as to be adjustable in the longitudinal direction of the machine body. It is comprised by the part 16b and the weeding tool support part 16c which consists of a sheet-metal member fixed to the front-end part of this sensor support part 16b. The weeding frame 16 includes a connecting shaft 52 included in the connecting member 50 that is bolted to the side of the transmission case 25 that is opposite to the side to which the grounding sensor bar 21 and the detection mechanism 22 are connected. The sensor support 16b is rotatably connected to a cylinder 16d attached to the front end of the sensor support 16b. Thus, the transmission case 25 is connected to the sensor support portion 16b of the weed frame 16 so as to be rotatable around the longitudinal axis Y of the connecting shaft 52 in the front-rear direction of the machine body, as shown in FIG. In this way, the rotation position where the axis X of the input shaft 26 located at the lower part of the transmission case 25 is lateral to the machine body is defined as the reference rotation position N, and the normal rotation direction A shown in FIG. In addition, it rotates with respect to the weed frame 16 around the axis Y in the reverse rotation direction B shown in FIG.

  The ground sensor bar 21 is formed of a strip steel plate that is bent and formed so as to include a connecting portion 21c formed of a bent piece at the front end and the ground acting portion 21a on the rear end. The connecting portion 21c is connected to an input shaft 26 positioned below the transmission case 25 so as to be integrally rotatable. As a result, when the transmission case 25 is in the reference rotation position N, the grounding sensor bar 21 has a transmission case 25 around the axis X of the input shaft 26 located at the front end of the grounding sensor bar 21. And it swings up and down with respect to the weeding frame 16. A sensor spring 23 is connected to the connecting portion 21c of the ground sensor bar 21, and the ground sensor bar 21 is urged downward by the sensor spring 23 so that the ground action portion 21a is grounded.

  As shown in FIGS. 5 and 6, the detection mechanism 22 is configured by a rotary potentiometer that operates so that the electric resistance changes when the operation shaft 22 a is rotated. The input shaft 26 includes a gear 43 that is connected to the operation shaft 22a so as to be integrally rotatable, and a fan-shaped gear 42 that is connected to the input shaft 26 so that the gear 43 is engaged with the input shaft 26. An interlocking mechanism 44 is provided inside the transmission case 25 for speeding up the rotation and transmitting the rotation to the operation shaft 22a of the detection mechanism 22. As a result, the detection mechanism 22 is moved to the ground sensor bar 21 by the interlock mechanism 44 so that when the ground sensor bar 21 swings with respect to the transmission case 25, the detection mechanism 22 operates to change the electrical resistance in conjunction with the swing. It is linked.

  As shown in FIGS. 3 and 4, the sensor urging mechanism 60 includes a winding spring 61 having a coil portion fitted on the connecting shaft 52 of the connecting member 50, and a pair of ends 62 and 63 of the winding spring 61. A spring operating pin 64 that is arranged so as to be inserted between them and a pair of end portions 62 and 63 of the winding spring 61 that are fixed to the connecting member 50 and a sensor support for the weed frame 16. A spring stopper 65 fixed to the portion 16b is provided.

That is, when the transmission case 25 rolls around the axis Y with respect to the weeding frame 16, the connecting member 50 rolls together with the transmission case 25. 4A shows a case where the transmission case 25 is at the reference rotation position N, and FIG. 4B shows a case where the transmission case 25 rotates in the normal rotation direction A from the reference rotation position N. 4C, when the transmission case 25 rotates in the normal rotation direction A from the reference rotation position N, as shown in the case where the transmission case 25 rotates in the reverse rotation direction B from the reference rotation position N. The one spring end 63 is supported by being in contact with the spring stopper 65, the spring operating pin 64 presses the other spring end 62 to elastically deform the winding spring 61, and the transmission case 25 is rotated in a standard manner. When rotating in the reverse rotation direction B from the position N, the other spring end 62 is abutted against and supported by the spring stopper 65, and the spring operating pin 64 presses one spring end 63 to elastically actuate the winding spring 61. Perform deformation operations.
As a result, when the grounding sensor bar 21 rolls in the forward rotation direction A or the reverse rotation direction B around the axis Y from the reference mounting posture in which the swing axis X of the ground sensor bar 21 is lateral to the body, Accordingly, the winding spring 61 is elastically deformed, and the winding spring 61 urges the ground sensor bar 21 to return to the reference mounting posture.

Thereby, the ground height detection device 20 operates as follows.
That is, normally, the transmission case 25 is in the reference rotation position N because of the winding spring 61, and the ground sensor bar 21 swings up and down with respect to the weed frame 16 around the axis X. When the ground height of the pre-cutting processing unit 10 changes and the ground height of the weeding frame 16 changes, the ground sensor bar 21 is driven by the ground reaction force acting on the ground action portion 21a and the sensor spring 23. It swings up and down with respect to the transmission case 25 and the weeding frame 16 around the axis X so that the grounding action part 21a is in a grounded state for the downward urging of the grounding sensor bar. Then, the operation shaft 22a of the detection mechanism 22 rotates in conjunction with the vertical swing of the ground sensor bar 21 in order to interlock with the ground sensor bar 21 by the interlock mechanism 44, and the detection mechanism 22 changes the electrical resistance. Accordingly, the detection mechanism 22 detects the swing angle of the ground sensor bar 21 relative to the transmission case 25 as the swing angle of the ground sensor bar 21 relative to the weed frame 16 and outputs the detection result to the control means 30 as an electrical signal. .
When the steering operation of the self-propelled aircraft is performed and the grounding sensor bar 21 moves to the left and right on the ground together with the pre-cutting processing unit 10 and is caught by a mass or a stump, the grounding sensor bar 21 and the shaft core Y together with the transmission case 25 It is possible to avoid rolling and rolling around the sensor bar 21 and the sensor bar 21 and the input shaft 26 from being deformed or damaged. When the rolling operation force applied to the ground sensor bar 21 is released, the transmission case 25 returns to the reference rotation position N for the sensor urging mechanism 60 and the ground sensor bar 21 detects the reference mounting posture for detection. It returns automatically.

  As shown in FIG. 5, a cable connecting portion 42a is provided at the end of the sector gear 42 in the interlock mechanism 44, and the inner end of the operation cable 70 is connected to the connecting hole 42b of the cable connecting portion 42a via a connecting pin 72. One end of the cable 70a is connected. As shown in FIGS. 8 and 9, the fan-shaped gear portion 74 b of the cable operating member 74 connected to the other end side of the inner cable 70 a via the interlocking spring 73 is connected to the pre-cutting processing portion 10. By engaging with the output gear 71a of the sensor lifting / lowering motor 71 supported by the frame 10a via a support 75, the sensor lifting / lowering motor 71 can switch the grounding sensor bar 21 up and down.

  That is, when the sensor lifting / lowering motor 71 is driven in the forward rotation direction or the reverse rotation direction, the motor 71 moves the cable operation member 74 around the axis of the support shaft 76 of the support body 75 via the sector gear portion 74b by the output gear 71a. The cable operation member 74 is operated to pull or loosen the inner cable 70a of the operation cable 70 via the interlocking spring 73 by the operation link portion 74a. When the inner cable 70a is pulled, the sector gear 42 is rotated in the forward rotation direction by the pulling force of the inner cable 70a, thereby rotating the input shaft 26 of the transmission case 25 to detect the ground sensor bar 21 as a sensor. Ascending operation to the ascending ground floating state U against the spring 23 is performed. When the inner cable 70a is loosened, the ground sensor bar 21 is lowered to the lowered ground state D by the operating force of the sensor spring 23. As the ground sensor bar 21 descends, the switch operation arm portion 74c of the cable operation member 74 presses the operation piece 37a of the lower limit switch 37 via the roller 77 to switch the lower limit switch 37. Then, the sensor lifting / lowering motor 71 stops and the lowering operation of the ground sensor bar 21 is stopped. Thereafter, the grounding sensor bar 21 swings with respect to the transmission case 25 due to the downward urging force by the sensor spring 23 and the grounding reaction force acting on the grounding action part 21 a, so that the grounding sensor bar 21 moves against the weeding frame 16. Go up and down. When the weeding frame 16 rises to the ground, the sensor spring 23 moves the ground sensor bar 21 downward while pulling the interlocking spring 73 to maintain the ground sensor bar 21 in a grounded state.

[Another embodiment]
In order to enable the elevation sensor bar 21 to be moved up and down in conjunction with the switching of the travel transmission 80 and the work clutch 82, in addition to the use of a microcomputer as in the above embodiment, an electric circuit and a link mechanism Therefore, the control means 30, the electric circuit, the link mechanism, and the like are collectively referred to as linkage operation means .

  The present invention can also be applied to a working machine for cutting stalks other than rice and wheat, and these working machines such as a combine are collectively referred to as a harvesting and harvesting machine.

Side view of combine front Plan view of the front part of the frame before the cutting process Side view of ground height detection device (A) is a front view of the transmission case at the reference rotation position, (B) is a front view of the transmission case in the normal rotation direction, and (C) is in the reverse rotation direction of the transmission case. The front view in the rotating state of Side view of interlocking mechanism Front view of interlocking mechanism Cutting height control block diagram Side view of sensor lift motor installation part Front view of sensor lift motor placement Explanatory drawing which shows the relationship between the gearbox for driving | running | working, a working clutch, and the raising / lowering state of a grounding sensor bar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pre-cutting process part 16 Weeding frame 21 Grounding sensor bar 22 Detection mechanism 30 Linking operation means 80 Traveling transmission device 82 Work clutch D Falling grounding state U Ascending ground floating state

Claims (2)

Mounted with a pre-cutting processing unit that can be adjusted up and down with respect to the self-propelled machine body, and provided with a traveling transmission that can be shifted in a forward transmission state, a neutral state, and a reverse transmission state on the self-propelled machine body. A grounding sensor bar supported by the weed frame so that it can swing up and down, a detection mechanism for detecting a swing angle of the grounding sensor bar with respect to the weed frame, and a predetermined mowing based on the detection result of the detection mechanism A harvesting and harvesting machine equipped with a cutting height control device that adjusts the height of the pre-cutting section to the ground so that the height is maintained,
It said ground sensor bar, lift switched freely form structure on the elevated ground floating state and a lowered ground state,
When the traveling transmission is switched to the forward transmission state, the ground sensor bar is switched to the descending grounding state, and the traveling transmission is switched to either the neutral state or the reverse transmission state. Stop the cutting height control by the cutting height control device, and the ground contact sensor bar is located above the horizontal extension line of the lower end of the weeding tool attached to the tip side of the weeding frame. to switch to the floating state, it is linked to the switching of the travel gear device reaper is provided a continuous engagement operation means that to operate switches the ground sensor bar harvester.   When the linkage operating means is linked to a working clutch that turns on and off the transmission to the pre-cutting processing unit, and when the working clutch is switched to the on state and the travel transmission is switched to the forward transmission state, the ground sensor bar When the working clutch is switched to the disengaged state, the ground sensor bar is switched to the ascending to ground-floating state in preference to the shifting state of the travel transmission. The harvesting and harvesting machine according to claim 1.

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