JPH03292270A - Spin turn control device for combine - Google Patents

Abstract

PURPOSE:To prevent impedance of a work by a method wherein, in control of a horizontal control mechanism by means of a sensor to perceive lateral inclination of a machine body, when spin turn is started, no control is executed until the spin turn is completed. CONSTITUTION:A combine comprises a running device 2 having a spin turn mechanism and a horizontal control mechanism, a reaping part 6 located on the front side of the running device 2, a threshing part 3 located above the running device 2, and a sensor, not shown, located in a desired position on a machine body 1 and perceiving lateral inclination of the machine body 1. In control of a horizontal control mechanism by means of the inclination sensing sensor, when spin turn is started, no control is carried out until spin turn is completed. By stopping the spin turn in the middle, a work is prevented from being impeded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a spin-turn control device for a combine harvester.

(Prior Art) Japanese Patent Application Laid-Open No. 63-125478, which is conventionally known, discloses a traveling device equipped with a spin-turn mechanism.

A reaping section provided on the front side of the traveling device, a threshing section provided above the traveling device for threshing the grain culm harvested by the reaping section, and a threshing section provided at a desired position on the machine body to sense the left and right inclination of the machine body. In a combine harvester equipped with an inclination sensing sensor, the spin turn mechanism and the inclination sensing sensor are arranged so that when the horizontal inclination of the machine body is gentle, normal directional control is sufficient, so the spin turn is not performed, and the spin turn mechanism and inclination sensor are connected to each other. A technique is described in which the sensing sensor performs a spin turn when the aircraft body has a strong left-right inclination, since normal direction control is not sufficient.

(Problem to be Solved by the Invention) The above-mentioned known device is equipped with a spin-turn mechanism and is capable of making sharp turns, but there is a problem in that the spin-turn mechanism is controlled by an inclination sensor. .

In other words, a tilt sensor must have the ability to accurately detect tilt, but because typical tilt sensors use liquid to detect the horizontal, they tend to shift and malfunction when turning. This may cause the spin turn to stop midway.

If the spin turn stops midway, work will be hindered.

(Objective of the Invention) Therefore, an object of the present invention is to prevent a spin turn from being stopped until the end of the spin turn once the spin turn is started.

(Means for Solving the Problems) Therefore, the present invention provides a traveling device 2 equipped with a spin-turn mechanism.
, a reaping section 6 provided on the front side of the traveling device 2, a threshing section 3 for threshing the grain culm harvested by the reaping section 6 provided above the traveling device 2, and a threshing section 3 provided at a desired position of the machine body 1. It has a tilt sensor 8 that detects the left and right tilt of the body 1.

In the combine harvester, the spin turn mechanism is configured to be controlled such that a spin turn cannot be performed when the tilt sensing sensor block detects a tilt, and the spin turn control by the tilt sensing sensor block is configured such that the spin turn is not performed when the tilt sensing sensor block detects a tilt. The spin turn control device in the combine is configured such that the sensor 57 is not controlled until the end of the spin turn, the spin turn control device in the combine is configured such that the sensitivity of the tilt sensing sensor 57 is low, and This is a spin-turn control device for a combine harvester in which a delay circuit is provided in the mechanism.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings. 1 is a fuselage of a combine, 2 is a traveling device provided below the fuselage 1, 3 is a threshing device provided above the fuselage 1, and 4 is a threshing device. A threshing room 113, 5 a winnowing room provided below the threshing room 4, 6 a reaping section provided on the front side of the machine body 1, 7 a weeding body, 8 a rake, and 9 a cutting blade. , 10 is Ogre, 1! is a conveying device that conveys and supplies the grain culm harvested by the reaping section 6 to the threshing room 4. Reference numeral 13 denotes a reaping vertical cylinder that moves the reaping section 6 and the conveying device 11 up and down about the upper rotating shaft of the conveying device 111.

A rolling mechanism is provided between the traveling device 2 and the body 1 to level the body 1 when the body 1 is tilted left or right.

In FIG. 2, 14.14' is a pair of left and right crawlers 115 constituting the traveling device 2; 5 degrees are installed at predetermined intervals at 16 and 16 degrees of the wheel mounting rods in the front and rear directions, respectively.

An arm 18 and a rear end portion of the arm 18 are respectively pivotally attached to the rear position of the wheel mounting rod 16.16' which is long in the front-rear direction by a shaft 17. , arm red,
The rear end of ' is fixed to the shaft 19 by a shaft 19.

The front end of the arm is connected to the wheel mounting rod 16.16.
It is rotatably attached to the rear position of the intermediate vertical frame 21° 21' provided at the inner upper position of ゛ by means of a backup horizontal axis η.

The arm 18.18' projects upwardly from the rear horizontal axis η, and has rolling cylinders n, at its upper end.
The rear ends of the 23° telescopic rods are each pivoted.

The front end of the arm extension is connected to the intermediate vertical frame 21.2.
1', each is rotatably attached to the front horizontal shaft 24. The front horizontal shaft 24 is attached to the body 1. The said arm is redundant, redundant.

protrudes upward from the front horizontal shaft 24, and the front end of 25.25' is fixed to the upper end by a connecting rod.
Connecting load 2 is 3, and the rear end of δ is the arm speed, 18
It is pivoted to the upper end of the arm, and when the arm holder and tracker move, the arm also moves by 4 degrees.

The intermediate vertical frame 21 and the intermediate vertical frame 21' are connected to each other by intermediate horizontal frames 3 and 27 in the left and right direction, and the intermediate vertical frame 21
．． The front end of 21' is rotatably attached to the front horizontal shaft 24. The bases of the rolling cylinders O and N are rotatably attached to the left and right sides of the intermediate horizontal frame n.

The fuselage 1 is located above the left and right intermediate vertical frames 21, 21' and the intermediate horizontal frame 21, and a pitching cylinder (9) for tilting the fuselage 1 forward and backward is located above the left and right sides of the fuselage 1. establish.

31 is an arm whose upper end is pivoted to the telescopic rod of the beeching cylinder (9) which is pivoted on the L side of the machine. is a horizontal shaft that pivots the lower part of the arm 31, and the horizontal shaft is attached to a support plate* fixed to the body 1.

The word is the arm whose rear end is fixed to the horizontal shaft support, 35 is the horizontal shaft attached to the front end of the arm armpit, straw is the arm whose lower end is fixed to the horizontal shaft, and g is the horizontal shaft to which the upper end of the arm is fixed. , the horizontal axis is attached to the intermediate vertical frame 21, 21'.

When the pitching cylinder extends its telescopic rod, it rotates the arm 31 to the right, rotates the horizontal axis to the right, rotates the arm fixed to the horizontal axis to the right, lowers the horizontal axis 5, and lowers the arm shaft. , the horizontal axis is lowered, the rear end of the intermediate vertical frame 21.21' is lowered around the front horizontal axis 24, the wheel mounting rod 16 is long in the front and back direction, and the rear part of the frame is centered around the front horizontal axis 24. descends to
The rear part of the traveling gear 2 is lowered. Since the lowering is supported by the ground, the rear part of the fuselage I moves upwards, thereby leveling out the rear slope of the fuselage.

Fig. 4 is a diagram of the hydraulic mechanism of the upper and lower reaping cylinders n, the rolling cylinders Otsu and Otsuo, and the pitching cylinder (9), where the hilt is an oil tank, the vane is a hydraulic pump, 40 is an unloading valve, and 41 is a reaping cylinder. The upper reaping valve of the upper and lower cylinders, C is the solenoid of the upper reaping valve 41, the center is the lower reaping valve of the upper and lower reaping cylinders B, the solenoid of the lower reaping valve in the morning, 45.45° is the rolling cylinder 23.23
' rolling valve, capital, 6° is rolling valve 4
5.6° solenoid, 47.47" is the rolling valve 45.6° solenoid, the hammer is the pi of the pitching cylinder (9), the pitching valve, 49 is the backward tilting solenoid of the pitching valve hammer, (capital) is This is a pitching valve female forward tilting solenoid.

Figure 5 is a diagram of the control mechanism; 51 is the switch for the manual tilt lever installed in the driver's seat; 5 is the switch for the vehicle height up/down lever; 5 is the switch for controlling the aircraft horizontally; 5 is the switch for controlling the aircraft's longitudinal inclination; 57 is a left and right tilt sensor of the machine body, 61 is a grain culm sensor, and 2 is a control unit.

8' is a stroke sensor that detects the left and right inclination of the aircraft; 8' is a stroke sensor 8;
I is a stroke sensor that detects the inclination of the body forward and backward, and section is a link mechanism of the stroke sensor I.

However, as described above, since the tilt sensor 57 uses liquid, it deviates due to inertia during sharp turns due to spin turns, and malfunctions when it recognizes a tilt even in a horizontal state, causing the rolling mechanism to malfunction. The spin turn mechanism may be activated and rolled, and the spin turn mechanism may be simultaneously controlled to stop the spin turn midway.

Therefore, in order to cause the spin turn to continue once it starts and until it ends, a method (2) of decreasing the sensitivity of the tilt sensor 57 is used. The methods include: shifting the sensitivity position somewhat, delaying the activation timing of the rolling cylinders A and NO by the inclination sensor 57 (by providing a so-called delay circuit), and ■ adjusting the expansion and contraction speed of the rolling cylinders A and B. As an example, a method of slowing down the spin turn can be considered as an example, and the spin turn can be ended smoothly. This point is the gist of the present invention.

FIG. 6 is a developed sectional view of a mission case equipped with a reversing mechanism A for spin-turning, and in the figure, 71
1 is a transmission case of the combine, η is an input shaft, n is a large gear provided on the input shaft η, 74 is an intermediate gear, and 74 is a small gear, and 74 is an intermediate shaft. A small gear n that connects and disconnects from the large gear π, a small gear weight that connects and disconnects from the small gear 74, and a large gear weight that connects and disconnects from the small gear 74 are respectively fixed to the intermediate shaft π. 80 is a large gear n, a small gear 74, and a small gear mounted on the input shaft η.

Reference numeral 81 denotes a side clutch shaft, and a center gear frame that meshes with a transmission gear formed on the intermediate sleeve cloth is fixed to the center position of the side clutch shaft 81. Leftward facing teeth and right internal teeth 6 are formed on both sides of the center gear frame, respectively.

A left latch body part that can be freely connected to and removed from the leftward tooth cavity, and a right clutch body part that can be freely connected to and removed from the right internal teeth 6 are loosely fitted into the side clutch shaft 81, respectively. A left latch case shell and a right clutch case shell are provided on the outside of each of the left and right clutch bodies and the nails, respectively. 90.91 is the left and right clutch case (equipment).

The left and right annular drums are rotatably attached to the mission case 71, and the left and right annular drums (materials), 91
When the side disk, the left and right clutch bodies, and the r side disk are brought into pressure contact, the traveling device 2 is braked.

A counter bearing is mounted near the side clutch shaft 81, a gear field and a winnow are fixed to the counter bearing, and a tooth portion 86a provided on the outer periphery of the left-hand latch body is attached to the gear case.
The toothed portions g7a provided on the outer periphery of the right clutch body r are always engaged with the gear winches.

Reference numeral 5 indicates a left axle, and reference numeral 5 indicates a right axle, and a left drive gear enclosure that meshes with the gear U of the counter bearing is fixed to the left axle 5,
A right drive gear 100 that meshes with the gear (to) of the counter bearing is fixed to the wheel shaft frame. Reference numerals 101 and 102 designate left and right clutch bodies for moving the left and right clutch bodies, and left and right clutches for moving the nails, and in FIG.

Thus, the reversing mechanism A is provided at the end of the side clutch shaft 81 shown in FIG. 6 to perform a spin turn by reversing the left and right clutch bodies and the nails. A sliding gear 104 that is slidable and rotatable in the axial direction is attached to one side of the side clutch shaft 81.

An inner engaging claw 105 is formed on the inner surface of the sliding gear 104, and the inner engaging claw 105 engages the side clutch shaft 8.
It removably engages with the engaging claw 108 fixed to 1. A right fixed pawl 107 is provided at one end of the side clutch shaft 81 where the transmission case 71 is attached (in FIG. 6, the sliding gear 104 is located between the engaging pawl 108 and the right fixed pawl 107 ), an outer engaging claw 108 formed on the outer surface of the sliding gear 104 is removably engaged with the right fixed claw 107.

Reference numeral 109 denotes a spring that urges the outer engaging claw 108 to engage with the right fixing claw 107.

Reference numeral 110 denotes a reversing intermediate shaft, and the reversing intermediate shaft 110 includes a reversing intermediate gear 111 that constantly meshes with the sliding gear 104.
The intermediate gear for reversing 111 meshes with the reversing gear 113 loosely fitted on the reversing shaft 112.
The outer peripheral teeth 114 formed on the outer peripheral surface of the right annular drum 91 are always engaged with each other.

Therefore, when the inner engaging pawl 105 of the sliding gear 104 is engaged with the engaging pawl 10B, the sliding gear 104→intermediate reversing gear 111→reversing gear 113→outer tooth 114 of the right annular drum 91. As a result of the transmission, the right annular drum 91 rotates in reverse relative to the center gear field.

In this state, when the rightward latch body is moved outward, the disc of the rightward latch body comes into pressure contact with the disc of the right annular drum 91 and is rotated in reverse relative to the center gear B, which is called the left axle 5. Perform a spin turn by reversing the axle frame.

However, if the outer engaging claw 10B is moved outward, the right fixed claw 10? When engaged, the sliding gear 104 stops rotating, the right annular drum 91 becomes fixed, and spin turns are no longer possible.

Therefore, when the difference in the amount of rolling between the left and right crawlers 14, 14'' exceeds a predetermined value during rolling control, the control section fly of this embodiment spins the aircraft 1 even if the spin lever 1 is operated. I try not to let it turn.

In other words, the stroke of the telescopic load 2 of the rolling cylinders O and N' is detected by the stroke sensor 8 and the cylinder 2, which indicates that the machine body l is tilted left and right by a predetermined amount or more and there is a large difference in the amount of rolling between the left and right crawlers 14 and 14. When detected by °, the control section forcibly moves the shifter 1113 of the sliding gear 104 (by means of hydraulic control, mechanical control, electrical control, etc.).
Let me.

The outer engaging claw 108 of the sliding gear 104 is connected to the mission case 7! The right fixing claw 107 on the side is engaged to make the spin turn impossible.

Furthermore, even when the control unit is not performing rolling control, if the left-right tilt sensor 57 detects the tilt of the machine body 1 due to the tilt of the field or the sinking of the machine body 1, the left-right tilt sensor 57 detects the tilt of the machine body 1. The control unit forcibly moves the shifter 118 of the sliding gear 104 (
means of hydraulic control, mechanical control, electrical control, etc.),
The outer engaging claw 108 of the sliding gear 104 is connected to the mission case 7! The right fixing claw 107 on the side is engaged to make the spin turn impossible.

Although the reversing mechanism A is provided at one end of the side clutch shaft 81 in FIG. 6, the reversing mechanism A is also provided at the other end of the side clutch shaft 81, so that the reversing mechanism A can be used in both right and left turns. It may also enable spin-turns.

(effect) Next, we will discuss the effect.

The present invention has the above configuration, and when the engine is rotated,
It rotates on the input shaft. Operate the chic (capital) to adjust the input shaft η
When any of the large gear n, small gear 74, and small gear weight provided on the intermediate shaft π is engaged with any of the small gear n, small gear weight, and large gear weight provided on The center gear blade is rotated through the transmission gear blade of the axle load.

When the center gear rotates, the left and right internal teeth of the center gear case rotate, and when the side clutch is engaged, the left and right internal teeth,
6, the left and right clutch bodies and the nails are engaged, so the left and right clutch bodies and the nails rotate in the forward direction; The left and right drive gears 98 and 100 are rotated forward through the winnow to travel.

Next, when the threshing section 2 of the combine is rotated and the reaping section 3 is activated, the harvested grain culm is threshed by the threshing section 2.

However, when changing the direction of the aircraft l in the field,
By operating the spin lever, the chic 11B is moved, the sliding gear 104 is moved inward, and the inner engaging pawl 105 is moved.
is engaged with the engaging pawl 106, and the sliding gear 104 rotates.

Then, the rotation of the sliding gear 104 is caused by the rotation of the intermediate gear 11 for reverse rotation.
1 → Rotate the reverse gear 113. Reverse gear 113
is in mesh with the outer peripheral teeth 114 of the right annular drum 91, so the right annular drum S1 is rotated and the right annular drum 91 is rotated.
is reversed with respect to the center gear enclosure.

In this state, when the right clutch body r is moved outward by operating the side clutch lever 103, the disk of the right clutch body r comes into pressure contact with the disk of the young annular drum 91, and the right clutch body is moved to the center gear. reversed against
The right drive gear 100 is reversely rotated via the gear wheel of the counter shaft which is always engaged with the teeth 87a of the right clutch body nail, thereby performing a spin turn.

During reaping and threshing work when the machine body 1 is moving forward, the machine body 1 may tilt to the left or right due to the slope of the field or the machine body 1 sinking. One of the rolling cylinders B is extended via the control unit 8 in response to the signal. When the rolling cylinder n extends, it pushes the upper end of the arm, and when it is turned into an arm, the connecting rod δ is moved backward, and the upper end of the arm is moved backward.

As a result, since both the arm and the arm rotate to the left, the wheel mounting rod 16 is moved down via the shafts 17 and 4,
The crawler 14 is moved downward to hold the aircraft l horizontally and perform rolling control.

The above explanation is about one crawler, but
The same applies to the other crawler.

Therefore, the stroke sensor 8 detects that the difference in rolling amount between the left and right crawlers 14 and 14° has exceeded a predetermined value.
．． When 8° is detected by the stroke of the rolling cylinder n and 23° is detected by the telescopic rod stroke, the control team is configured so that the spin turn does not occur even if the spin lever controller is operated, and the control team controls the shifter 118 of the sliding gear 1G4. is forcibly moved (or held, by means of hydraulic control, mechanical control, electrical control, etc.), and the outer engaging pawl 108 of the sliding gear 104 is moved to the right fixed pawl 107 on the mission case 71 side.
, and the sliding gear 104 is kept in a fixed state.

Then, the sliding gear 104 stops the rotation of the intermediate reversing gear 111, stops the rotation of the reversing gear 113 meshing with the intermediate reversing gear 111, and rotates the right annular drum with which the reversing gear 113 meshes. Because it stops the rotation of 91,
Even if the right clutch body r is moved outward by operating the side clutch lever 103, the disc of the right clutch body nail presses against the disc of the right annular drum 91 and brakes the traveling device 2, thereby preventing the spinning. Can't make a turn.

However, as described above, since the tilt sensor 57 uses liquid, it deviates due to inertia during sharp turns due to spin turns, and malfunctions when it recognizes a tilt even in a horizontal state, causing the rolling mechanism to malfunction. The spin turn mechanism may be actuated to roll and at the same time control the spin turn mechanism to stop the spin turn in the middle.However, in the present invention, in order to cause the spin turn to be performed once the spin turn is started, it is possible to perform the spin turn until the end. A method for reducing the sensitivity of the sensing sensor 57; ■ A method for delaying the activation timing of the rolling cylinders O and O by the inclination sensing sensor 57 (by providing a so-called delay circuit); ■ A method for slowing down the expansion and contraction speed of the rolling cylinders 23 and 23'. Since this method is adopted, the spin turn can be completed smoothly.

(Effect) The above-mentioned known device is equipped with a spin-turn mechanism and is capable of making sharp turns, but since the spin-turn mechanism is configured to be controlled by a tilt-sensing sensor, this is not the case with a typical tilt-sensing sensor. When spinning, the liquid may shift and malfunction, causing the spin turn to stop midway.

However, the present invention provides a traveling device 2 equipped with a spin-turn mechanism, a reaping section 6 provided on the front side of the traveling device 2, and #J
The recording traveling device 2 has a threshing section 3 for threshing the grain harvested by the reaping section 6 provided above, and a tilt sensing sensor installed at a desired position of the machine body 1 for sensing the left and right inclination of the machine body 1. In the combine harvester, the spin turn mechanism is configured to be controlled such that a spin turn cannot be performed when the tilt sensing sensor unit senses an inclination, and the spin turn control by the inclination sensing sensor unit is such that the spin turn is not started. In this case, the spin turn control device in the combine was configured so that it was not controlled until the spin turn was completed.

B. The spin turn can be performed until the end and does not interfere with the work.

Furthermore, in claim (1), the tilt sensing sensor 57 is a spin turn control device for a combine harvester configured to have low sensitivity. Let me extend it,
The spin turn can be completed until the end without hindrance to the work.

C. Also, in claim (1), since the spin-turn control device for a combine harvester is provided with a delay circuit in the tilt sensing sensor 57 or its related mechanism, it can be implemented at a small cost. can.

This effect is achieved.

[Brief explanation of drawings]

Figure 1 is a side view of the combine, Figure 2 is a plan view of the traveling device, Figure 3 is a right side view of the same, Figure 4 is a hydraulic mechanism diagram, Figure 5 is a circuit diagram, and Figure 6 is a missi case. This is a developed diagram. Explanation of symbols 1... Airframe, 2... Traveling device, 3... Threshing device,
4... Threshing room, 5... Wind sorting room, 6... Reaping section, 7
... Grass division, 8... Scraping reel, 9... Cutting blade,!
0...Auger, 11...Transfer device, 爲...Upper and lower cylinder, 14.14°...Crawler, 15, ts"
... Rolling wheel, 16.16'... Rolling wheel mounting rod, 17...
・Axis, auxiliary, bo°...arm, four...axis, ni"・
... Arm, 21.21'... Middle vertical frame, η... Rear horizontal axis, 23.23' Rolling cylinder, 24.
・・Front side horizontal axis, 3, δ° ・・Connecting rod, N・・
・Intermediate horizontal frame, (capital)...Pitching cylinder, 31
...Arm, (...horizontal axis, wings...support plate, idiom...
・Arm, ah...horizontal axis, ah...arm, 37...
Horizontal axis, (... oil tank, (... hydraulic pump, ω...
・Unload valve, 41... Reaping valve, main...
・Solenoid, C...lower reaping valve, morning solenoid, horse chestnut, 45'...rolling valve, mallet, kaede...
・Solenoid, 47.47°... Solenoid, mallet...
・Pitching valve, 49... Backward tilting solenoid, (capital)... Forward tilting solenoid, 5L52.5... Switch, μs... Aircraft longitudinal tilt sensor, 57... Aircraft left/right tilt sensor, 61.・・Grain culm sensor, ・・control unit,
田、si9...stroke sensor、辅、rA'...
Link mechanism, 6... Stroke sensor, name... Link mechanism, 71... Mission case, 72... Input shaft, n... Input gear, 73... Large gear, 74...
Small gear, No... Small gear, 1... Intermediate shaft, n... Small gear, Tsu... Small gear, 4... Large gear, (capital)...
Shifter, 81...Side clutch shaft, Dry...Transmission gear, Field...Center gear, 84...Left internal tooth, 6...
・Right internal teeth, shell... left clutch body, 86a... teeth,
``...Right clutch body, 8'?a...teeth, wings...
Left clutch case, right clutch case, (capital)
...Annular drum, 31...Annular drum, Desired...Counter shaft, Ta, Tatsumi...Gear, Kaku...Left axle, Kaku...
・Right axle, q...gear, section...left drive gear, weak...
・Gear, 100...Right drive gear, 101, 102・
...Shifter, 103...Side clutch lever-110
4...Sliding gear, 105...Inner engaging claw, 10B.
... Engaging claw, 107... Right fixed claw, 108... Outer engaging claw, 10s... Spring, 110... Reversing intermediate shaft,
111...Reverse rotation intermediate gear, 112...Reverse rotation shaft, 11
3... Reverse gear, 114... Outer tooth, 11B...
chic. 1. Indication of the case Relationship with the person who amended Patent Application No. 94598 of 1990

Claims (3)

[Claims] (1) Threshing for threshing the harvested grain culms using a traveling device 2 equipped with a spin-turn mechanism, a reaping section 6 provided on the front side of the traveling device 2, and the reaping section 6 provided above the traveling device 2. 3 and an inclination sensor 56 provided at a desired position of the aircraft body 1 to detect the left and right inclination of the aircraft body 1, and the spin turn mechanism cannot perform a spin turn when the inclination sensor 56 detects an inclination. In the combine harvester configured to be controlled as follows, the inclination sensing sensor 56
Spin turn control is performed by a spin turn control device in a combine that is configured so that once a spin turn is started, it is not controlled until the end of the spin turn. (2) The spin-turn control device for a combine harvester according to claim (1), wherein the inclination sensing sensor 57 is configured to have low sensitivity. (3) A spin-turn control device for a combine harvester according to claim (1), wherein a delay circuit is provided in the tilt sensing sensor 57 or its related mechanism.