Combine

Abstract

To provide a combine which can be operated at ease.SOLUTION: A combine 1 includes a seat 10, an operation part 40, a first detection part 81, and a control part 60. An operator is seated on the seat 10. The operation part 40 includes a reaping part 41, a threshing part 42, and a feed chain 43 that work against a work target. The first detection part 81 detects a seating state or a non-seating state of the operator on the seat 10. The control part 60 controls the operation part 40 based on an instruction of the operator. When the first detection part 81 detects the non-seating state, the control part 60 restricts an operation of the operation part 40 based on the instruction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a combine harvester.

Background Art

[0002] The forward and reverse switching device for a power vehicle described in Patent Document 1 electrically detects the forward and reverse switching of the vehicle body and includes a switch and a control means. The switch is disposed on the seat and detects the presence or absence of an operator who is a worker. The control means holds the forward and reverse switching of the vehicle body in a neutral state when the operator is away from the seat.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, in addition to a traveling unit that moves forward and backward, a combine harvester has a working unit that works on a work target. The working unit is, for example, a threshing unit or a cutting unit. When an operator leaves the seat of the combine harvester and works outside the combine harvester, such as when lubricating a rotating part, there is a risk of causing an unexpected situation.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a combine harvester capable of avoiding an unexpected situation.

Means for Solving the Problems

[0006] The combine according to the present invention includes a seat, a working unit, a detection unit, and a control unit. An operator sits on the seat. The working unit works on a work target. The detection unit detects whether the operator is sitting or not sitting on the seat. The control unit controls the working unit based on an instruction from the operator. When the detection unit detects the non-sitting state, the control unit restricts the operation of the working unit based on the instruction.

Advantages of the Invention

[0007] According to the present invention, an unexpected situation can be avoided.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[0010] With reference to FIGS. 1 and 2, the work vehicle according to this embodiment will be described. FIG. 1 is a schematic view of the combine 1 according to this embodiment. FIG. 2 is a control block diagram of the combine 1.

[0011] In this specification, for ease of understanding, the front-rear direction, left-right direction, and up-down direction may be described. Here, the front-rear direction, left-right direction, and up-down direction are the directions as viewed from the driver (operator) seated on the driver's seat 10 (see FIG. 1). However, the front-rear direction, left-right direction, and up-down direction are defined only for convenience of explanation, and there is no intention to limit the orientation of the combine 1 of the present invention during use and assembly by these direction definitions. Also, the front direction may be described as the front direction in which the driver seated on the seat 10 faces.

[0012] The combine 1 is, as an example, a self-threshing combine. The combine 1 can automatically travel based on an instruction from an operator and perform a crop harvesting operation or the like while automatically traveling. The instruction for automatic travel is input to the combine 1, for example, when the operator operates an operation unit 50 described later. As shown in FIGS. 1 and 2, the combine 1 includes a seat 10, an engine 20, a traveling unit 30, a working unit 40, an operation unit 50, and a control unit 60.

[0013] The engine 20 drives the traveling unit 30 and the working unit 40. The engine 20 is, for example, a diesel engine. The engine 20 converts thermal energy obtained by burning fuel into kinetic energy (power). The engine 20 corresponds to, for example, a "drive source".

[0014] The traveling unit 30 moves the combine 1. Specifically, the traveling unit 30 travels based on the power (kinetic energy) generated by the engine 20. The traveling unit 30 is provided at the lower part of the machine body 2. The traveling unit 30 includes a crawler-type traveling device 31 having a pair of left and right crawlers.

[0015] The working unit 40 performs work on the work target. The work target is, for example, cereal straws. As shown in FIG. 1, the working unit 40 includes a cutting unit 41, a threshing unit 42, a feed chain 43, and a grain discharging unit 70.

[0016] The cutting unit 41 cuts the cereal straws. The cutting unit 41 is provided at the front part of the machine body 2 so as to be liftable. As shown in FIG. 1, the cutting unit 41 includes a straw separating unit 411, a lifting unit 412, a cutting and conveying unit 413, and a cutting unit 414.

[0017] The straw separating unit 411 separates the cereal straws in the field. The lifting unit 412 lifts the cereal straws after separation. The cutting and conveying unit 413 conveys the lifted cereal straws rearward. The cutting unit 414 cuts the cereal straws being conveyed rearward. The cut cereal straws are further conveyed rearward toward the feed chain 43 by the cutting and conveying unit 413.

[0018] The threshing unit 42 threshes the cereal straws. The threshing unit 42 is arranged, for example, at the upper left part of the machine body 2. As shown in FIG. 1, the threshing unit 42 includes a threshing cylinder 421, a rocking sorting mechanism 422, a winnowing fan 423, a processing cylinder (not shown), a dust exhaust fan 424, a straw discharge chain (not shown), and a straw discharge cutter (not shown).

[0019] The handling cylinder 421 threshes the cereal straws conveyed by the feed chain 43. The processed material threshed by the handling cylinder 421 is sorted by a receiving net (not shown) during the falling process. The unprocessed material not threshed by the handling cylinder 421 is conveyed from the handling chamber (not shown) to the processing chamber (not shown) through a dust outlet (not shown). In the processing chamber, the processing cylinder processes the unprocessed material. The processed material by the processing cylinder is sorted by a processing cylinder net (not shown) during the falling process. The processed material falling from the processing cylinder net is conveyed forward by a reduction conveyor (not shown) and falls from the front end of the reduction conveyor.

[0020] The processed material falling from the receiving net, the processing cylinder net, and the reduction conveyor is subjected to oscillating sorting (specific gravity sorting) by the oscillating sorting mechanism 422. The processed material subjected to oscillating sorting is subjected to air sorting by the winnowing fan 423.

[0021] Among the materials air-sorted by the winnowing fan 423, the top-quality product is conveyed by the top conveyor (not shown) to the top elevating cylinder (not shown), and then continuously conveyed to the grain discharging section 70 by the elevating conveyor of the top elevating cylinder. Among the materials air-sorted by the winnowing fan 423, the second-quality product is taken out by the second conveyor (not shown). The second-quality product taken out by the second conveyor is returned to the upper surface side of the oscillating sorting mechanism 422 through the second reduction cylinder (not shown) and the second processing section.

[0022] The feed chain 43 conveys the cereal straws. The feed chain 43 is arranged, for example, on the left side of the machine body 2. The feed chain 43 conveys the cereal straws from the cutting section 41 to the threshing section 42. Specifically, the feed chain 43 takes over the cut cereal straws from the cutting section 41 and conveys them to the rear threshing section 42.

[0023] The straw scraps and dust in the threshed material from the handling cylinder 421 are discharged outside the machine by the sorting air from the winnowing fan 423. The dust discharge at the rear of the rocking sorting mechanism 422 is discharged outside the machine by the dust discharge fan 424. A straw discharge chain is arranged on the rear end side of the feed chain 43. The straw discharge (the stalk from which the grains have been threshed) inherited from the feed chain 43 to the straw discharge chain at the rear end side is discharged outside the machine while maintaining its long shape. Or, the straw discharge is cut to an appropriate predetermined length by a straw discharge cutter provided at the rear part of the threshing section 42 and then discharged outside the machine.

[0024] The grain discharge section 70 discharges the grains outside the machine. The grain discharge section 70 is arranged, for example, at the upper right part of the machine body 2. As shown in FIG. 1, the grain discharge section 70 includes a grain tank 71, a discharge auger 72, and a conveyor (not shown).

[0025] The grain tank 71 is arranged, for example, at the rear right part of the machine body 2. The discharge auger 72 is connected to the grain tank 71. The grains in the grain tank 71 are conveyed through the discharge auger 72 by the conveyor and discharged outside the machine from the discharge port of the discharge auger 72.

[0026] The power of the engine 20 is branched and transmitted in two directions from the output shaft of the engine 20 to the transmission case (not shown), the cutting section 41, and the threshing section 42. Also, other power of the engine 20 is transmitted from the output shaft of the engine 20 to the discharge auger 72.

[0027] The first branched power from the output shaft of the engine 20 toward the transmission case is transmitted to the input shaft of the transmission case. The power transmitted to the input shaft of the transmission case is transmitted to the cutting PTO shaft (not shown) and then transmitted to the cutting section 41 via the cutting clutch 410 (see FIG. 2).

[0028] The second branched power from the output shaft of the engine 20 towards the threshing unit 42 is transmitted to the threshing shaft of the threshing fan 423 via the threshing clutch 420 (see Fig. 2). A part of the power transmitted to the threshing shaft is transmitted to the first conveyor, the elevating conveyor, the second conveyor, the return conveyor, the swing shaft of the swing sorting mechanism 422, the dust exhaust shaft of the dust exhaust fan 424, and the straw cutter.

[0029] Also, the power is transmitted from the threshing shaft to the front end of the feed chute 43 via the feed chute clutch 430 (see Fig. 2) and the feed chute shaft. Furthermore, the power from the threshing shaft is also transmitted to the handling cylinder input shaft (not shown). The power transmitted to the handling cylinder input shaft is branched and transmitted in two directions to the handling cylinder 421 and the processing cylinder.

[0030] The power from the output shaft of the engine 20 towards the discharge auger 72 is transmitted to the bottom conveyor in the grain tank 71 and the vertical conveyor in the vertical auger cylinder of the discharge auger 72 via a gear mechanism (not shown) and an auger clutch for power interruption (not shown).

[0031] Next, with reference to FIGS. 3 to 7, the seat 10 will be described. FIG. 3 is a perspective view showing the first position P1 of the seat 10. FIG. 4 is a side view comparing the first position P1 and the second position P2. FIG. 5 is a view showing the internal state of the seat base 11 in the non-seated state. FIG. 6 is a view showing the internal state of the seat base 11 in the seated state. FIG. 7 is a perspective view showing the seat base 11.

[0032] The driver (operator) sits on seat 10. As shown in FIG. 3, seat 10 has a seat cushion 10a, a seat back 10b, a seat base 11, a cover 12, a tilt mechanism 13, and a first detection unit 81. The seat base 11 has the first detection unit 81. When the driver sits on the seat cushion 10a and leans against the seat back 10b, the driver faces the front direction (forward). The seat base 11 supports seat 10 from below. The seat base 11 is fixed to the floor of the steering operation unit (driving space) via a fixing member 14. The cover 12 covers a part of the seat base 11 and is detachably provided with respect to the seat base 11. The tilt mechanism 13 adjusts the tilt of seat 10 with respect to the seat base 11. The tilt mechanism 13 is arranged on the seat base 11. The first detection unit 81 detects the seating and non-seating of the driver on seat 10. The first detection unit 81 corresponds to, for example, the "detection unit". Also, the operator sitting on seat 10 may be referred to as the "driver".

[0033] As shown in FIG. 4, seat 10 can be mutually displaced between a first position P1 and a second position P2 by the tilt mechanism 13. The first position P1 indicates a state in which the seat cushion 10a of seat 10 is inclined at an angle (elevation angle) α1 [°] with respect to the reference plane A of the seat base 11. The second position P2 indicates a state in which the seat cushion 10a of seat 10 is inclined at an angle (elevation angle) α2 [°] with respect to the reference plane A of the seat base 11. Hereinafter, the inclination angle of the seat cushion 10a in the first position P1 may be described as the angle α1, and the inclination angle of the seat cushion 10a in the second position P2 may be described as the angle α2. In the present embodiment, the angle α2 is larger than the angle α1. Also, the angle α1 includes (0 [°]). That is, the first position P1 includes a state in which it is not inclined with respect to the reference plane A of the seat base 11. For example, the reference plane A is a plane parallel to the floor of the steering operation unit.

[0034] When the driver sits on the seat 10 at the second position P2, the driver's field of vision is biased downward compared to when sitting on the seat 10 at the first position P1. Therefore, the driver sitting on the seat 10 at the second position P2 can easily visually recognize the state of the cutting blade of the cutting unit 41 located diagonally below the steering operation unit.

[0035] Regardless of whether the seat 10 is in the first position P1 or the second position P2, the first detection unit 81 detects whether the driver is seated or not. In other words, the first detection unit 81 detects whether a load is applied to the non-inclined seat 10 and whether a load is applied to the inclined seat 10. The operation of the first detection unit 81 will be described later.

[0036] As described above, the first detection unit 81 detects whether the driver is seated on the seat 10 whose inclination can be adjusted by the tilt mechanism 13. Since the first detection unit 81 can detect the seating on the seat 10 at the second position P2, the seat 10 can easily visually recognize diagonally downward while detecting the seating on the seat 10.

[0037] As shown in FIGS. 5 to 7, the seat base 11 includes a first base 111, a second base 112, and a spring 113. The first base 111 supports the seat cushion 10a (see FIG. 3) from below. The second base 112 supports the first base 111 from below. A plurality of springs 113 are provided, for example. The spring 113 biases the first base 111 toward the seat 10.

[0038] As shown in FIGS. 3 to 7, a tilt mechanism 13 is provided on the first base 111. Specifically, the tilt mechanism 13 includes a rotation mechanism 15 and an adjustment mechanism 16. The rotation mechanism 15 and the adjustment mechanism 16 are arranged on the first base 111. In the present embodiment, the seat cushion 10a has a front end portion and a rear end portion. The rotation mechanism 15 rotates the front end portion of the seat cushion 10a in the vertical direction. The adjustment mechanism 16 adjusts the distance between the rear end portion of the seat cushion 10a and the seat base 11. With the tilt mechanism 13, the tilt angle of the seat 10 can be adjusted with a simple configuration.

[0039] Specifically, the rotation mechanism 15 is provided at the front end of the first base 111. The rotation mechanism 15 includes a rotation shaft 152. The seat 10 is rotatably attached to the rotation shaft 152 via an attachment portion 151 provided at the front end portion of the seat cushion 10a. Thereby, the seat 10 can rotate about the rotation shaft 152.

[0040] The adjustment mechanism 16 is arranged on the seat base 11 on the rear side of the rotation mechanism 15. The adjustment mechanism 16 has a support portion 161, a connection portion 162, and a shaft portion 163. The support portion 161 is a rod-shaped member extending along the left-right direction and supports the rear side of the rotation mechanism 15 of the seat 10. The connection portion 162 connects the support portion 161 to the first base 111. Specifically, the connection portion 162 is a member extending along a direction intersecting the left-right direction from the support portion 161, one end of which is attached to the support portion 161 and the other end of which is attached to the first base 111. The shaft portion 163 rotatably supports the connection portion 162 in the vertical direction. Specifically, the connection portion 162 is rotatably attached to the shaft portion 163 via an attachment portion 151 provided at the front end portion of the seat cushion 10a. Thereby, the support portion 161 connected to the connection portion 162 rotates about the shaft portion 163. Therefore, the distance between the rear end portion of the seat cushion 10a and the seat base 11 can be adjusted with a simple configuration.

[0041] Next, the detection of seating by the first detection unit 81 will be described. As shown in FIGS. 5 and 6, the first base 111 and the second base 112 are rotatably connected to each other via a rotation shaft 117. Also, between the first base 111 and the second base 112, two springs 113 are arranged side by side in the front-rear direction in front of the rotation shaft 117. Thereby, the distance between the first base 111 and the second base 112 varies according to the load applied to the seat 10. In the present embodiment, the first detection unit 81 is a potentiometer. Typically, the first detection unit 81 is arranged on the first base 111. The first detection unit 81 detects whether or not a load is applied to the seat 10 based on the distance between the first base 111 and the second base 112. The first detection unit 81 includes, for example, a variable resistance unit 114, a rotary switch 115, and a signal input / output unit 116. The signal input / output unit 116 outputs an electrical signal corresponding to the electrical resistance value corresponding to the position of the variable resistance unit 114 to the control unit 60.

[0042] Since the seat 10 is placed on the first base 111 via the tilt mechanism 13, the distance between the first base 111 and the second base 112 corresponding to the load applied to the seat 10 is the same regardless of whether the seat 10 is in the first position P1 or the second position P2 by the tilt mechanism 13. Therefore, regardless of whether it is in the first position P1 or the second position P2, it is possible to detect whether or not the driver is seated on the seat 10, that is, the seating and non-seating of the operator by the first detection unit 81.

[0043] Next, with reference to FIG. 8, the operation unit 50 will be described. FIG. 8 is a plan view showing the operation unit 50.

[0044] The operation unit 50 receives the operator's operations and inputs instructions corresponding to the operations to the control unit 60. As shown in FIGS. 1, 2, and 8, the operation unit 50 includes a handle 51, a work operation unit 52, a main speed change operation unit 53, a sub-speed change operation unit 54, a handling switch 55, a quick pedal 56, and a feed change switch 57. Among the operation unit 50, the handle 51, the work operation unit 52, the main speed change operation unit 53, and the sub-speed change operation unit 54 are arranged within the steering operation unit and are operated by the driver sitting on the seat 10. The handling switch 55 is attached to a grain straw supply guide (not shown) provided on the left side of the machine body. The quick pedal 56 is arranged on the floor of the steering operation unit. The feed change switch 57 is provided on the main speed change operation unit 53. Hereinafter, the feed change 43 may be described as FC.

[0045] As shown in FIG. 1, the handle 51 changes the direction in which the combine 1 travels. When the mode of the combine 1 is the manual driving mode, the driver can operate the handle 51 to turn the combine 1. Turns include, for example, a 90-degree turn (α turn), a U-turn, and a fishtail turn.

[0046] As shown in FIG. 8, the work operation unit 52 is operated to a first position 52a, a second position 52b, and a third position 52c. When the operator performs work related to the cutting unit 41 or the threshing unit 42, the work operation unit 52 is operated to any one of the first position 52a, the second position 52b, and the third position 52c. As shown in FIG. 2, a second detection unit 82 for detecting the operation position of the work operation unit 52 is connected to the work operation unit 52.

[0047] The first position 52a is the position where the cutting unit 41 performs the cutting operation. As shown in FIGS. 2 and 8, the first position 52a indicates a position where power is transmitted to the threshing unit 42 via the threshing clutch 420 and power is transmitted to the cutting unit 41 via the cutting clutch 410. The operator's operation includes the operation of the working operation unit 52 to the first position 52a. The threshing clutch 420 interrupts the power from the engine 20 to the threshing unit 42. The cutting clutch 410 interrupts the power from the engine 20 to the cutting unit 41. As shown in FIG. 8, specifically, when the working operation unit 52 is operated to the first position 52a, the cutting clutch 410 is in the "engaged" state and the threshing clutch 420 is in the "engaged" state.

[0048] The second position 52b is the position where the threshing unit 42 performs the threshing operation. As shown in FIGS. 2 and 8, the second position 52b indicates a position where power is transmitted to the threshing unit 42 via the threshing clutch 420 and the cutting clutch 410 cuts off the power transmitted to the cutting unit 41. As shown in FIG. 8, specifically, when the working operation unit 52 is operated to the second position 52b, the cutting clutch 410 is in the "disengaged" state and the threshing clutch 420 is in the "engaged" state.

[0049] The third position 52c is a stop position where neither the cutting unit 41 nor the threshing unit 42 performs any of the cutting operation and the threshing operation. As shown in FIGS. 2 and 8, the third position 52c indicates a position where the threshing clutch 420 cuts off the power transmitted to the threshing unit 42 and the cutting clutch 410 cuts off the power transmitted to the cutting unit 41. As shown in FIG. 8, specifically, when the working operation unit 52 is operated to the third position 52c, the cutting clutch 410 is in the "disengaged" state and the threshing clutch 420 is in the "disengaged" state.

[0050] When the cutting clutch 410 is operated to the "engaged" state, the power of the engine 20 can be transmitted to the cutting unit 41, and when it is operated to the "disengaged" state, the power of the engine 20 cannot be transmitted to the cutting unit 41. As shown in FIG. 2, a first actuator 91 for driving the cutting clutch 410 is connected to the cutting clutch 410.

[0051] When the threshing clutch 420 is operated to the "ON" state, the power of the engine 20 can be transmitted to the threshing unit 42, and when it is operated to the "OFF" state, the power of the engine 20 cannot be transmitted to the threshing unit 42. As shown in FIG. 2, a second actuator 92 for driving the threshing clutch 420 is connected to the threshing clutch 420.

[0052] The feed chain 43 is linked to the cutting unit 41 in principle. Accordingly, the feed chain clutch 430 that transmits or shuts off the power of the engine 20 to the feed chain 43 is in the "OFF" state when the work operation unit 52 is in the second position 52b and the third position 52c, and is in the "ON" state when the work operation unit 52 is in the first position 52a.

[0053] When the feed chain clutch 430 is operated to the "ON" state, the power of the engine 20 can be transmitted to the feed chain 43, and when it is operated to the "OFF" state, the power of the engine 20 cannot be transmitted to the feed chain 43. As shown in FIG. 2, a third actuator 93 for driving the feed chain clutch 430 is connected to the feed chain clutch 430.

[0054] The main transmission operation unit 53 is an operation unit 50 that can change the traveling speed of the combine 1. The main transmission operation unit 53 changes the traveling speed by changing the inclination angle of the swash plate of a hydraulic continuously variable transmission (not shown). As shown in FIG. 8, the main transmission operation unit 53 is operated to a forward position 53a, a neutral position 53b, and a reverse position 53c. The operator's operation includes the operation of the main transmission operation unit 53 to the forward position 53a.

[0055] The main transmission operation unit 53 is operable to a neutral position 53b in the vertical posture, a forward position 53a that is tilted forward with respect to the neutral position 53b, and a reverse position 53c that is tilted rearward with respect to the neutral position 53b. When the main transmission operation unit 53 is operated to the neutral position 53b, the combine 1 stops. When the main transmission operation unit 53 is operated to the forward position 53a, the combine 1 moves forward. When the main transmission operation unit 53 is operated to the reverse position 53c, the combine 1 moves backward. As shown in FIG. 2, a third detection unit 83 for detecting the operation position of the main transmission operation unit 53 is connected to the main transmission operation unit 53.

[0056] The sub-transmission operation unit 54 is an operation unit 50 for setting the transmission gear. As shown in FIG. 8, the sub-transmission operation unit 54 is operated to a first setting position 54a, a second setting position 54b, a third setting position 54c, and a fourth setting position 54d. The first setting position 54a sets the traveling speed of the combine 1 to the first speed. The second setting position 54b sets the traveling state of the combine 1 to the neutral state. The third setting position 54c sets the traveling speed of the combine 1 to a third speed that is higher than the first speed. The third speed is the standard speed for performing field work. The fourth setting position 54d sets the traveling speed of the combine 1 to a fourth speed that is higher than the third speed. The fourth speed is the traveling speed for traveling on the road surface during movement. The operator's operation includes the operation of the sub-transmission operation unit 54 to the second setting position 54b.

[0057] Specifically, the sub-transmission operation unit 54 operates a sub-transmission device (not shown) to set the output and rotational speed of the hydraulic continuously variable transmission to four shift stages: high speed (fourth speed), standard speed (third speed), low speed (first speed), and neutral state (stop). As shown in FIG. 2, a fourth detection unit 84 for detecting the operation position of the sub-transmission operation unit 54 is connected to the sub-transmission operation unit 54.

[0058] As shown in FIG. 2, the handling switch 55 is an operation unit 50 for performing handling work and is configured to be capable of ON / OFF operation. A fifth detection unit 85 for detecting the operation position of the handling switch 55 is connected to the handling switch 55. In the present embodiment, the handling switch 55 is configured as a switch-type operation unit, but for example, it may be configured as a lever-type operation unit, a dial-type operation unit, a pedal-type operation unit, or the like.

[0059] The quick pedal 56 is an operation unit 50 that drives the cutting unit 41 and the threshing unit 42 by operating when the work operation unit 52 is operated to the first position 52a. A limit time is provided for the driving time of the cutting unit 41 and the threshing unit 42 by the quick pedal 56. The driving time of the cutting unit 41 and the threshing unit 42 by the quick pedal 56 is the time required for a series of operations from cutting to threshing, for example, 5 seconds. When the quick pedal 56 is turned on, the feed chain 43 and the cutting unit 41 are operated for the limit time. A sixth detection unit 86 for detecting the operation position of the quick pedal 56 is connected to the quick pedal 56.

[0060] The feed chain switch 57 is configured to be capable of ON / OFF operation of a motor (not shown) that drives the feed chain 43. The feed chain switch 57 can be manually operated by the operator. When the feed chain switch 57 is turned on, the feed chain 43 is forcibly driven. A seventh detection unit 87 for detecting the operation position of the feed chain switch 57 is connected to the feed chain switch 57.

[0061] Next, with reference to FIG. 9, the control unit 60 will be described. FIG. 9 is a table T showing the operation start conditions of the operation modes of the combine 1.

[0062] The control unit 60 controls the traveling unit 30 and the working unit 40 of the combine 1. Specifically, as shown in FIG. 2, the control unit 60 is an arithmetic device such as a CPU (Central Processing Unit).

[0063] The control unit 60 controls the working unit 40 based on the operator's instructions. The operator gives instructions to the control unit 60 through the operation of the operation unit 50. The control unit 60 receives signals output from the operation unit 50 and various switches, etc., and controls the cutting unit 41, the threshing unit 42, and the feed chain 43 according to the instruction content indicated by the signals. The control unit 60 may be one piece of hardware or a plurality of pieces of hardware capable of communicating with each other. The control unit 60 has a storage unit 61.

[0064] The storage unit 61 is a main storage device such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The storage unit 61 may further include an auxiliary storage device such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive). Various programs and data, etc. are stored in the storage unit 61. Also, the storage unit 61 stores the operation start conditions of each working mode defined in the table T. The control unit 60 reads out various programs from the storage unit 61 and executes them.

[0065] When the first detection unit 81 detects that the operator is not seated, the control unit 60 restricts the operation of the working unit 40 based on the operator's instructions. As a result, the operator can avoid unexpected situations. Specifically, when the operator's seating is not detected, the control unit 60 restricts the operation of the working unit 40 based on the operator's instructions, so that the working unit 40 does not operate when the operator is not seated on the seat 10. Therefore, the operator can operate the working unit 40 only when the operator is seated on the seat 10 of the combine 1.

[0066] As shown in FIG. 9, the control unit 60 executes, for example, the first mode T1 to the fourth mode T4. The first mode T1 is an operation mode in which the feed chain 43 rotates continuously, and the second mode T2 is an operation mode in which the feed chain 43 rotates for 5 seconds. The third mode T3 is an operation mode in which the cutting unit 41 and the feed chain 43 rotate for 5 seconds, and the fourth mode T4 is an operation mode in which the cutting unit 41 and the feed chain 43 rotate continuously. The fourth mode T4 corresponds to the oil injection mode. The oil injection mode T4 indicates a mode in which oil is injected into the cutting unit 41, the threshing unit 42, and the feed chain 43. Hereinafter, the fourth mode T4 may be described as the oil injection mode T4.

[0067] For the first mode T1, the "engagement" operation of the threshing clutch 420 and the "press" operation of the handling switch 55 are the operation start conditions.

[0068] For the second mode T2, the "engagement" operation of the threshing clutch 420 and the "press" operation of the feed chain switch 57 are the operation start conditions.

[0069] For the third mode T3, the "engagement" operation of the threshing clutch 420, the "engagement" operation of the cutting clutch 410, and the "step-on" operation of the quick pedal 56 are the operation start conditions. Also, for the third mode T3, the "engagement" operation of the threshing clutch 420, the "engagement" operation of the cutting clutch 410, the "press" operation of the feed chain switch 57, the operation to the "neutral position (second set position 54b)" of the sub-shift operation unit 54, and the operation to the "forward position 53a" of the main-shift operation unit 53 are the operation start conditions.

[0070] For the fourth mode T4 (oil injection mode T4), the "engagement" operation of the threshing clutch 420, the "engagement" operation of the cutting clutch 410, the operation to the "neutral position" of the sub-shift operation unit 54, the operation to the "forward position 53a" of the main-shift operation unit 53, the operation in which the rotational speed of the engine 20 becomes lower than the determination threshold value k, and the "ON" operation of the first detection unit 81 are the operation start conditions.

[0071] When the mode of the combine harvester 1 is the refueling mode T4, an operator working outside the combine harvester 1 can operate the working unit 40 only when the driver is seated on the seat 10. That is, since the driver is seated on the seat 10 of the combine harvester 1, the operator can safely perform work on the working unit 40. Specifically, when the mode of the combine harvester 1 is the refueling mode T4, the operator can safely refuel the cutting unit 41, the threshing unit 42, and the feed chain 43.

[0072] The control unit 60 executes the refueling mode T4 that drives the cutting unit 41, the threshing unit 42, and the feed chain 43 based on the instructions of the operator. Therefore, the operator can safely refuel the cutting unit 41, the threshing unit 42, and the feed chain 43.

[0073] When the first detection unit 81 detects the seating of the operator after the operation unit 50 is operated, the control unit 60 restricts the operation of the working unit 40 based on the instruction. As a result, a sense of security can be given to the operator. Specifically, since the operation unit 50 that receives the operation of the operator is provided, an instruction for the working unit 40 can be detected by the operation of the operator. When the seating of the operator is detected after the operation of the operation unit 50, in order to restrict the operation of the working unit 40 based on the instruction, for example, it is possible to restrict the resumption of the operation of the working unit 40 immediately after the operator is seated. That is, when the operation of the working unit 40 is temporarily stopped by the detection of non-seating where the operator is not seated during the operation of the working unit 40, the operation of the working unit 40 will not resume even if the operator sits down after inadvertently operating the operation unit 50. Therefore, the operation of the working unit 40 is not unexpectedly resumed by the seating of the operator who is not aware of operating the operation unit 50. As a result, a sense of security is given to the operator working outside the combine harvester 1 and the driver.

[0074] When the first detection unit 81 detects the operator's seating after the operation unit 50 has been operated, the control unit 60 activates the working unit 40 on the condition that the operator re - operates the operation unit 50 after the seating is detected. As a result, the operator can start the operation of the working unit 40 without discomfort. Specifically, when the operation of the working unit 40 is restricted, the control unit 60 activates the working unit 40 on the condition that the operator re - operates the operation unit 50. Therefore, the intention of the operator to start the operation can be determined through the re - operation of the operation unit 50. That is, based on the intention of the operator to start the operation, the operation of the working unit 40 can be started.

[0075] When the first detection unit 81 detects non - seating during the operation of the working unit 40, the control unit 60 cuts off the power transmitted to the threshing unit 42 and the power transmitted to the cutting unit 41. When the control unit 60 is operated to the third position 52c where the cutting clutch 410 is in the "off" state and the threshing clutch 420 is in the "off" state after seating is detected again after non - seating is detected by the first detection unit 81, the control unit 60 activates the working unit 40 on the condition that the working operation unit 52 is operated to the first position 52a. Also, when the control unit 60 is operated to the third position 52c where the cutting clutch 410 is in the "off" state and the threshing clutch 420 is in the "off" state after seating is detected again after non - seating is detected by the first detection unit 81, the control unit 60 may activate the working unit 40 to execute the oiling mode T4 on the condition that the working operation unit 52 is operated from the first position 52a to the second position 52b and then to the first position 52a. When seating is detected again after non - seating is detected, since the control unit 60 activates the working unit 40 on the condition that the working operation unit 52 is operated from the first position 52a to the third position 52c and then to the first position 52a, the intention of the operator who wishes to start the operation of the working unit 40 can be confirmed through the operation of the working operation unit 52. Thereby, after confirming the intention of the operator, the operation by the working unit 40 can be started.

[0076] When the control unit 60 detects that the operator has re-seated after the first detection unit 81 detects non-seating, the control unit 60 activates the working unit 40 on the condition that the main shift operation unit 53 is operated from the neutral position 53b to the forward position 53a. Since the control unit 60 activates the working unit 40 on the condition that the main shift operation unit 53 is operated from the neutral position 53b to the forward position 53a, it is possible to confirm the intention of the operator who wishes to start the operation of the working unit 40 through the operation of the main shift operation unit 53.

[0077] When the control unit 60 detects that the operator has re-seated after the first detection unit 81 detects non-seating, the control unit 60 activates the working unit 40 on the condition that the sub-shift operation unit 54 is operated from a position other than the second set position 54b to the second set position 54b. The operation of the operator includes the operation of the sub-shift operation unit 54 to the second set position 54b. Since the control unit 60 activates the working unit 40 on the condition that the sub-shift operation unit 54 is operated from a position other than the second set position 54b to the second set position 54b, it is possible to confirm the intention of the operator who wishes to start the operation of the working unit 40 through the operation of the sub-shift operation unit 54.

[0078] When the control unit 60 detects that the operator has re-seated after the first detection unit 81 detects non-seating, the control unit 60 activates the working unit 40 on the condition that after the rotational speed of the engine 20 becomes equal to or higher than the determination threshold value k, the rotational speed becomes lower than the determination threshold value k. Since the condition for restarting the fuel injection mode T4 is that after the rotational speed of the engine 20 becomes equal to or higher than the determination threshold value k, the rotational speed becomes lower than the determination threshold value k, it is possible to confirm the intention of the operator who wishes to start the operation of the working unit 40 through an operation accompanied by a change in the rotational speed of the drive source.

[0079] Next, with reference to FIGS. 10 and 11, the control process of the working unit 40 performed by the control unit 60 will be described. FIG. 9 is a part of a flowchart showing an example of the process of the control unit 60. FIG. 11 is the remainder of the flowchart showing an example of the process of the control unit 60. As shown in FIGS. 10 and 11, the process of the control unit 60 includes steps S1 to S16. Steps S1 to S16 are executed when the processor of the control unit 60 executes the program.

[0080] As shown in FIG. 10, in step S1, the control unit 60 reads various information. The process proceeds to step S2.

[0081] In step S2, the control unit 5 determines whether the operation start condition of the oil injection mode T4 is satisfied. If the control unit 60 determines that the operation start condition of the oil injection mode T4 is not satisfied (No in step S2), the process proceeds to step S7. If the control unit 60 determines that the operation start condition of the oil injection mode T4 is satisfied (Yes in step S2), the process proceeds to step S3.

[0082] In step S3, the control unit 60 determines whether the final satisfaction condition, that is, the condition that was last satisfied, is the seating of the operator. The seating of the operator is detected by the "ON" operation of the first detection unit 81. If the control unit 60 determines that the final satisfaction condition is not seating (No in step S3), the process proceeds to step S10. If the control unit 60 determines that the final satisfaction condition is seating (Yes in step S3), the process proceeds to step S4.

[0083] In step S4, the control unit 60 restricts the execution of the oil injection mode T4. The process proceeds to step S5. The control unit 60 stops the operations of the cutting unit 41, the threshing unit 42, and the feed chain 43, and does not execute the oil injection mode T4.

[0084] In step S5, the control unit 60 sets the flag F to 1. The process ends. The flag F being 1 means that all the operation conditions for performing the oil injection mode T4 are satisfied, but the execution of the oil injection mode T4 is restricted.

[0085] If the result in step S2 is No, in step S7, the control unit 60 determines whether the flag F is not 1. If the control unit 60 determines that the flag F is not 1 (No in step S7), the process proceeds to step S9. If the control unit 60 determines that the flag F is 1 (Yes in step S7), the process proceeds to step S8.

[0086] In step S8, the control unit 60 does not perform the oil injection mode T4.

[0087] If the answer in step S7 is No, in step S9, the control unit 60 sets the flag F to 2. The process ends. The fact that the flag F is 2 means that the final condition of the oil injection mode T4 is satisfied when the operator is seated, and then the condition for executing the oil injection mode T4 becomes unsatisfied.

[0088] If the answer in step S3 is No, in step S10, the control unit 60 determines whether the flag F is 2. If the control unit 60 determines that the flag F is not 2 (No in step S10), the process proceeds to step S15. If the control unit 60 determines that the flag F is 2 (Yes in step S10), the process proceeds to step S11.

[0089] As shown in FIG. 11, in step S11, after the work operation unit 52 is operated to the third position 52c, the control unit 60 determines whether the work operation unit 52 has been operated to the first position 52a. If the control unit 60 determines that the work operation unit 52 has been operated to the first position 52a after being operated to the third position 52c (Yes in step S11), the process proceeds to step S15. Since the flag F is 2, the conditions other than the work operation unit 52 are satisfied, and it is determined that the operation start condition is satisfied by operating the work operation unit 52 to the first position 52a after being operated to the third position 52c. If the control unit 60 determines that the work operation unit 52 has not been operated to the first position 52a after being operated to the third position 52c (No in step S11), the process proceeds to step S12.

[0090] In step S12, after the main shift operation unit 53 is operated to the neutral position 53b, the control unit 60 determines whether it is operated to the forward position 53a. When the control unit 60 determines that it is operated to the forward position 53a after the main shift operation unit 53 is operated to the neutral position 53b (Yes in step S12), the process proceeds to step S15. It is determined that the operation start condition is satisfied by operating the main shift operation unit 53 to the forward position 53a after it is operated to the neutral position 53b. When the control unit 60 determines that it is not operated to the forward position 53a after the main shift operation unit 53 is operated to the neutral position 53b (No in step S12), the process proceeds to step S13.

[0091] In step S13, after the sub-shift operation unit 54 is operated to a position other than the second set position 54b, the control unit 60 determines whether it is operated to the second set position 54b. When the control unit 60 determines that it is operated to the fourth set position 54d after the sub-shift operation unit 54 is operated to a position other than the second set position 54b (Yes in step S13), the process proceeds to step S15. It is determined that the operation start condition is satisfied by operating the sub-shift operation unit 54 to the second set position 54b after it is operated to a position other than the second set position 54b. When the control unit 60 determines that it is not operated to the second set position 54b after the sub-shift operation unit 54 is operated to a position other than the second set position 54b (No in step S13), the process proceeds to step S14.

[0092] In step S14, after the rotational speed of the engine 20 becomes equal to or higher than the determination threshold value k, the control unit 60 determines whether the rotational speed has become lower than the determination threshold value k. When the control unit 60 determines that the rotational speed of the engine 20 has become lower than the determination threshold value k after becoming equal to or higher than the determination threshold value k (Yes in step S14), the process proceeds to step S15. After the rotational speed of the engine 20 becomes equal to or higher than the determination threshold value k, it is determined that the operation start condition is satisfied when the rotational speed becomes lower than the determination threshold value k. The rotational speed of the engine 20 is, for example, adjusted by operating the main transmission operation unit 53 or the sub-transmission operation unit 54. When the control unit 60 determines that the rotational speed of the engine 20 has not become lower than the determination threshold value k after becoming equal to or higher than the determination threshold value k (No in step S14), the process proceeds to step S4.

[0093] If the answer in step S10 is No, in step S15, the control unit 60 executes the fuel injection mode T4. The process proceeds to step S16.

[0094] In step S16, the control unit 60 sets the flag F to 0. The process ends. The fact that the flag F is 0 means that the final condition of the fuel injection mode T4 is satisfied by an operation other than the operator's seating. The process ends.

[0095] The embodiments of the present disclosure have been described above with reference to the drawings. However, the present disclosure is not limited to the above-described embodiments and can be implemented in various forms without departing from the gist thereof. Also, the plurality of components disclosed in the above embodiments can be modified as appropriate. For example, a component among all the components shown in one embodiment may be added to the components of another embodiment, or some of the components among all the components shown in one embodiment may be deleted from the embodiment.

[0096] Further, for the purpose of facilitating the understanding of the present disclosure, the drawings schematically show each component mainly, and the thickness, length, number, interval, etc. of each illustrated component may be different from the actual situation for convenience of drawing preparation. Also, the configuration of each component shown in the above embodiments is an example and is not particularly limited, and it goes without saying that various changes can be made without substantially departing from the effects of the present disclosure.

[0097] (1) As described with reference to FIGS. 1 to 11, in the above embodiment, an example where the work based on the operator's instruction is the oil filling mode T4 is shown, but it is not limited thereto. The work based on the operator's instruction may be in any one of the first mode T1 to the third mode T3. Also, the work based on the operator's instruction may be performed for a plurality of modes among the first mode T1 to the fourth mode T4.

[0098] (2) In the above embodiment, an example where the working unit 40, the mowing unit 41, the threshing unit 42, and the feed chain 43 are driven during the oil filling mode T4 is shown, but it is not limited thereto. During the oil filling mode T4, any one or only two of the mowing unit 41, the threshing unit 42, and the feed chain 43 may be selected and driven.

[0099] (3) In the above embodiment, an example where the working operation unit 52, the main speed change operation unit 53, the sub speed change operation unit 54, the rotational speed of the engine 20, and the seating state on the operator's seat 10 are set as the establishment conditions of the oil filling mode T4 is shown, but it is not limited thereto. At least, it is only necessary to determine the seating state on the seat 10, and conditions may be arbitrarily set from the working operation unit 52, the main speed change operation unit 53, the sub speed change operation unit 54, and the rotational speed of the engine 20. Also, other operation units 50 may be set as conditions.

[0100] (4) In the above embodiment, an example where the seat 10 is provided with a tilt mechanism 13 and the presence or absence of a driver (operator) in the semi-reclined state (slightly raised state) is detected is shown, but it is not limited thereto. It is also possible to arrange ON / OFF on the seat 10 and detect a driver sitting on the seat cushion 10a. Also, the presence or absence of a driver may be detected by an electric sensor.

[0101] (5) In the above-described embodiment, the work operation unit 52, the main transmission operation unit 53, and the sub-transmission operation unit 54 are configured by the sub-transmission operation unit 54 which is a lever-type operation unit 50. However, the present invention is not limited thereto. For example, it may be configured by a dial-type operation unit 50, a pedal-type operation unit 50, or the like.

[0102] (6) In the above-described embodiment, an example of the drive source is the engine 20 which is an internal combustion engine, but the present invention is not limited thereto. The drive source may be an electric motor.

[0103] (7) In the above-described embodiment, when the first detection unit 81 detects non-seating, the operation of the working unit 40 related to the refueling mode T4 is restricted. However, the present invention is not limited thereto. When the first detection unit 81 detects non-seating, the operation of the working unit 40 related to any one of the first mode T1 to the fourth mode T4 may be restricted, or the operations of the working unit 40 related to a plurality of modes may be restricted.

[0104] This application discloses the following supplementary notes. The following supplementary notes do not limit the present invention.

[0105] (Supplementary Note 1) A seat on which an operator sits, A working unit that works on a work target, A detection unit that detects the seating and non-seating of the operator on the seat, A control unit that controls the working unit based on an instruction of the operator and comprising, the control unit is when the detection unit detects the non-seating, a combine that restricts the operation of the working unit based on the instruction.

[0106] (Supplementary Note 2) further comprising an operation unit that receives an operation of the operator and inputs an instruction corresponding to the operation to the control unit, the control unit is When the detection unit detects the operator's seating after the operation unit is operated, the combine according to appended note 1 restricts the operation of the working unit based on the instruction.

[0107] (Appended note 3) When the detection unit detects the operator's seating after the operation unit is operated, the combine according to appended note 2 operates the working unit on the condition that the operator re - operates the operation unit after the seating is detected.

[0108] (Appended note 4) The working unit includes a cutting unit for cutting cereal straws, and a threshing unit for threshing the cereal straws and has The combine further includes a drive source for driving the working unit, a cutting clutch for interrupting the power from the drive source to the cutting unit, a threshing clutch for interrupting the power from the drive source to the threshing unit, an operation unit that receives the operator's operation and inputs an instruction corresponding to the operation to the control unit and the operation unit includes a work operation unit, the work operation unit is operated to a first position, a second position, and a third position, the first position indicates a position where power is transmitted to the threshing unit via the threshing clutch and power is transmitted to the cutting unit via the cutting clutch, the second position indicates a position where power is transmitted to the threshing unit via the threshing clutch and the cutting clutch cuts off the power transmitted to the cutting unit, the third position indicates a position where the threshing clutch cuts off the power transmitted to the threshing unit and the cutting clutch cuts off the power transmitted to the cutting unit, the operator's operation includes the operation of the work operation unit to the first position, the control unit When the detection unit detects the unseated state during the operation of the working unit, the power transmitted to the threshing unit and the power transmitted to the cutting unit are cut off. When the seated state is detected again after the detection unit detects the unseated state, the working unit is operated on the condition that the working operation unit is operated to the first position after being operated to the third position, the combine according to any one of Appendices 1 to 3.

[0109] (Appendix 5) The combine further includes an operation unit that receives the operation of the operator and inputs an instruction corresponding to the operation to the control unit. The operation unit includes a main speed change operation unit. The main speed change operation unit is operated to a forward position, a neutral position, and a reverse position. The operation of the operator includes the operation of the main speed change operation unit to the forward position. The control unit When the seated state is detected again after the detection unit detects the unseated state, the working unit is operated on the condition that the main speed change operation unit is operated from the neutral position to the forward position, the combine according to any one of Appendices 1 to 4.

[0110] (Appendix 6) The combine further includes an operation unit that receives the operation of the operator and inputs an instruction corresponding to the operation to the control unit. The operation unit includes a sub-speed change operation unit. The sub-speed change operation unit is operated to a first setting position for setting the traveling speed of the combine to a first speed, a second setting position for setting the traveling speed of the combine to a second speed lower than the first speed, a third setting position for setting the traveling speed of the combine to a third speed lower than the second speed, and a fourth setting position for setting the traveling state of the combine to a neutral state. The operation of the operator includes the operation of the sub-speed change operation unit to the fourth setting position. The control unit When the seating is detected again after the non - seating is detected by the detection unit, the working unit is operated on the condition that the sub - shift operation unit is operated from a position other than the fourth set position to the fourth set position, the combine according to any one of Appendices 1 to 5.

[0111] (Appendix 7) Further comprising a drive source for driving the working unit, The control unit, When the seating is detected again after the non - seating is detected by the detection unit, the working unit is operated on the condition that after the rotational speed of the drive source becomes equal to or higher than a determination threshold value and then becomes lower than the determination threshold value, the combine according to any one of Appendices 1 to 6.

[0112] (Appendix 8) The working unit, A cutting unit for cutting cereal straws, A threshing unit for threshing the cereal straws, A feed chain for conveying the cereal straws from the cutting unit to the threshing unit And has, The control unit executes an oiling mode for driving the cutting unit, the threshing unit, and the feed chain based on an instruction from the operator, The oiling mode indicates a mode of oiling the cutting unit, the threshing unit, and the feed chain, the combine according to any one of Appendices 1 to 7.

Industrial Applicability

[0113] The present invention is a combine and has industrial applicability.

Explanation of Signs

[0114] 1: Combine 10: Seat 20: Engine (drive source) 40: Working unit 41: Cutting unit 42: Threshing unit 43: Feed chain 50: Operation Unit 52: Work Operation Unit 52a: First Position 52b: Second Position 52c: Third Position 53: Main Transmission Operation Unit 53a: Forward Position 53b: Neutral Position 53c: Reverse Position 54: Sub - Transmission Operation Unit 54a: First Set Position 54b: Second Set Position 54c: Third Set Position 54d: Fourth Set Position 60: Control Unit 81: First Detection Unit (Detection Unit) 410: Cutting Clutch 420: Threshing Clutch T4: Lubrication Mode k: Judgment Threshold Value

Claims

1. A seat on which a worker sits; A working unit that works on a work object; A detection unit that detects whether the worker is seated or not in the seat; a control unit that controls the working unit based on an instruction from the worker; Equipped with The control unit is A combine harvester that restricts operation of the working unit based on the instruction when the detection unit detects the non-seating.

2. An operation unit that receives an operation by the operator and inputs an instruction corresponding to the operation to the control unit, The control unit is The combine harvester according to claim 1 , wherein, when the detection unit detects the operator sitting on the seat after the operation unit is operated, the operation of the working unit based on the instruction is restricted.

3. The combine harvester according to claim 2, wherein when the detection unit detects the operator sitting down after the operating unit is operated, the control unit operates the working unit on the condition that the operator operates the operating unit again after detecting the operator sitting down.

4. The working unit includes: A reaping unit that harvests culms; A threshing unit for threshing the stumps; having The combine harvester is A drive source that drives the working unit; a mowing clutch that interrupts the power from the drive source to the mowing unit; A threshing clutch that interrupts the power from the drive source to the threshing unit; an operation unit that receives an operation by the worker and inputs an instruction corresponding to the operation to the control unit; Further equipped with The operation unit includes a work operation unit, The work operation unit is operated to a first position, a second position, and a third position, The first position indicates a position in which power is transmitted to the threshing section via the threshing clutch and power is transmitted to the reaping section via the reaping clutch, The second position indicates a position in which power is transmitted to the threshing section via the threshing clutch and the reaping clutch cuts off the power transmitted to the reaping section, The third position indicates a position in which the threshing clutch cuts off the power transmitted to the threshing unit and the reaping clutch cuts off the power transmitted to the reaping unit, The operation by the worker includes an operation of the work operation unit to the first position, The control unit is When the detection unit detects the non-seating during operation of the working unit, the power transmitted to the threshing unit and the power transmitted to the reaping unit are cut off, A combine harvester as described in any one of claims 1 to 3, wherein when the detection unit detects the non-seating and then detects the seating again, the working unit is operated on the condition that the work operating unit is operated to the third position and then to the first position.

5. The combine further includes an operation unit that receives an operation by the operator and inputs an instruction corresponding to the operation to the control unit, The operating unit includes a main shift operating unit, The main transmission operating unit is operated to a forward position, a neutral position, and a reverse position, The operation by the operator includes an operation of the main shift operating unit to the forward position, The control unit is The combine harvester according to any one of claims 1 to 3, wherein when the detection unit detects the non-seating state and then detects the seating state again, the working unit is operated on the condition that the main speed change operating unit is operated from the neutral position to the forward position.

6. The combine further includes an operation unit that receives an operation by the operator and inputs an instruction corresponding to the operation to the control unit, The operation unit includes an auxiliary transmission operation unit, The auxiliary speed change operating unit is operated to a first setting position for setting the traveling speed of the combine to a first speed, a second setting position for setting the traveling speed of the combine to a second speed lower than the first speed, a third setting position for setting the traveling speed of the combine to a third speed lower than the second speed, and a fourth setting position for setting the traveling state of the combine to a neutral state, The operation by the operator includes an operation of the auxiliary shift operating unit to the fourth setting position, The control unit is The combine harvester according to any one of claims 1 to 3, wherein when the detection unit detects the non-seating and then detects the seating again, the working unit is operated on the condition that the auxiliary speed change operating unit is operated from a position other than the fourth set position to the fourth set position.

7. Further comprising a drive source for driving the working unit, The control unit is A combine harvester as described in any one of claims 1 to 3, wherein when the detection unit detects the non-seating state and then detects the seating state again, the working unit is operated on the condition that the rotation speed of the drive source becomes equal to or greater than a judgment threshold value and then becomes lower than the judgment threshold value.

8. The working unit includes: A reaping unit that harvests culms; A threshing unit that threshes the culms; A feed chain that transports the stalks from the reaping section to the threshing section; having The control unit executes an oiling mode for driving the reaping unit, the threshing unit, and the feed chain based on an instruction from the operator, The combine harvester according to any one of claims 1 to 3, wherein the oiling mode indicates a mode in which oil is applied to the reaping section, the threshing section, and the feed chain.

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