JP6811704B2 - Mowing amount detector - Google Patents

Description

The present invention relates to a grass cutting amount detecting device that detects the amount of grass cut contained in a grass collecting container in a grass mower.

As a grass cutting detection device having the above configuration, Patent Document 1 includes a sensor plate swingably provided in a grass collecting container provided in a grass mower, and a spring for urging the sensor plate in the closing direction. Described is a technique in which the detection means reaches the detection state when the sensor plate reaches a predetermined swinging posture due to the weight of the grass housed in the.

In the grass cutting amount detecting device of Patent Document 1, a sensor plate is fitted into a detection hole formed in a grass collecting container, one end of the sensor plate is swingably supported by a pivot shaft, and the sensor plate is closed. The urging direction of the spring is set so as to urge the reference posture.

JP-A-2010-4799

In the grass cutting amount detecting device described in Patent Document 1, the sensor plate is maintained in the reference posture (closed posture) when the amount of grass cut contained in the grass collecting container is small. Then, when the amount of grass to be accommodated increases, the swinging end of the sensor plate reaches a posture in which the swinging end of the sensor plate projects outward from the opening edge of the detection hole due to the weight of the grass.

However, when the swinging end of the sensor plate projects outward from the opening edge of the detection hole as the amount of grass cut increases, a gap is formed between the swinging end of the detection hole and the swinging end of the sensor plate. This led to the inconvenience of part of the cut grass leaking out from this gap.

In order to eliminate such inconvenience, for example, it is conceivable to form an eaves-shaped protrusion that protrudes outward with respect to the upper part of the opening edge of the detection hole, but the eaves shape is used to suppress the leakage of grass. If the clearance between the lower surface of the protruding portion and the swinging end of the sensor plate is reduced, grass will be caught between the lower surface of the eaves and the swinging end of the sensor plate, impairing the smooth swinging of the sensor plate. It was also imagined.

For this reason, there is a need for a grass cutting amount detecting device that suppresses the leakage of grass even if the sensor plate that detects the amount of grass cut is oscillating.

A feature of the present invention is a sensor plate that is arranged at a position to be fitted into a detection opening formed in the grass collecting container and is swingably supported by the grass collecting container about the axis.
An urging member that urges the sensor plate in the closing direction,
It is provided with a detection unit that detects the swing when the sensor plate swings against the urging force of the urging member due to the weight of the cut grass contained in the grass collecting container.
The sensor plate has a structure in which the swinging end projects outward of the detection opening due to the action of the weight of the grass, and the swinging end of the opening edge of the detection opening is relative to the inner surface side of the grass collecting container. The point is that it is equipped with a regulatory member that regulates the movement of grass in the direction of.

According to this characteristic configuration, the amount of grass cut contained in the grass collecting container increases, and when the sensor plate swings around the axis due to the weight of the cut grass, the sensor plate is directed outward from the detection opening. Even if the swinging end of the sensor plate is overhanging, the regulating member regulates the grass cutting that tends to flow in the direction of the swinging end of the sensor plate along the opening edge of the detection opening. By regulating the flow of grass in this way, it is possible to suppress the phenomenon that the grass leaks from the gap even if a gap is formed between the opening edge of the detection opening and the swinging end of the sensor plate. ..
That is, since the cut grass has a predetermined length, a large number of cut grasses are intertwined inside the grass collecting container. Further, when the cut grass leaks from the gap, the plurality of cut grass in the entangled state moves so as to flow in the direction of the gap. For this reason, it is possible to suppress leakage from the gap between the grass cuts only by regulating the phenomenon that the grass cuts flow to the swinging end of the sensor plate at the opening edge of the detection opening of the regulating member.
Therefore, even if the sensor plate for detecting the amount of mowed grass swings, a mowing amount detecting device for suppressing the leakage of mowed grass is configured.

As another configuration, when the sensor plate is in the closed posture due to the urging force of the urging member, a shield body overlapping on the outer surface side of the opening edge of the detection opening is provided at the swinging end of the sensor plate. You may.

According to this, the sensor plate swings due to the weight of the grass, and a gap is formed between the swing end of the sensor plate and the opening edge of the detection opening, and even if the grass may pass through this gap, This mowing comes into contact with the shield, and leakage of the mowing to the outside can be suppressed.

As another configuration, the shaft core is arranged in a horizontal position under the sensor plate.
A leak suppressing member made of a material that can be flexibly deformed is provided for one of the side end portion of the sensor plate in the left-right direction and the portion of the opening edge of the detection opening facing the side end portion. Is also good.

According to this, by providing the leakage suppression member, the leakage suppression member is arranged so as to fill the gap between the side end portion of the sensor plate and the opening edge portion of the detection opening facing the side end portion of the sensor plate. it can. As a result, the grass can be suppressed from leaking from the gap between the side end portion of the sensor plate and the detection opening. In particular, since a material capable of flexibly deforming the leakage suppression member is used, for example, a rubber plate or a brush-like member is used, and this material is arranged so as to fill the gap between the side end portion of the sensor plate and the detection opening. Therefore, the leakage of grass can be suppressed more satisfactorily.

It is an overall view of a mower. It is a side view of the mowing recovery device. It is a side view of the mowing recovery device in a discharge posture. It is sectional drawing of the grass amount detection device in which a sensor plate is in a reference posture. It is sectional drawing of the grass amount detection apparatus which a sensor plate is in a detection posture. It is sectional drawing which shows the sensor plate which is in a reference posture, a regulation member, and a leakage suppression member. It is sectional drawing which shows the sensor plate which is in a detection posture, a regulation member, and a leakage suppression member. It is a rear view which shows the part of a sensor plate. It is a perspective view which shows the structure of a sensor case and a sensor plate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
〔overall structure〕
FIG. 1 is an overall side view of the mower 100. As shown in the figure, F is the "forward direction" of the self-propelled vehicle, R is the "rear direction" of the self-propelled vehicle, U is the "upward direction" of the self-propelled vehicle, and D is the "downward direction" of the self-propelled vehicle. Is shown.

As shown in FIG. 1, the mower 100 includes a pair of left and right front wheels 1 that can be steered and a pair of left and right rear wheels 2 that can be driven, and a driver's seat 3 in the driver's section of the vehicle body. It is configured as a passenger-type self-propelled vehicle. A mowing device 20 supported by a link unit 10 is provided between the front wheels 1 and the rear wheels 2 of the body frame 4 of the self-propelled vehicle. Further, a grass cutting recovery device 30 is provided at the rear of the vehicle body frame 4 via a support frame 31, and the grass cutting recovery device 30 has a grass collecting container 32 for accommodating the grass cutting.

The mowing machine 100 performs mowing work for mowing grass and grass as it travels. That is, the self-propelled vehicle is provided with an engine 5 at the front portion of the vehicle body, and includes a traveling drive system that transmits the driving force of the engine 5 to the left and right rear wheels 2 via the transmission 17 and the left and right transmission cases 18. At the same time, it is provided with a work drive system that transmits the driving force of the engine 5 from the power extraction mechanism 40 below the engine 5 to the mowing device 20.

[Work drive system and mowing device]
As shown in FIG. 1, the power extraction mechanism 40 has an input shaft 41, and the driving force of the engine 5 is transmitted to the input shaft 41 via the transmission belt 42. The driving force of the input shaft 41 is transmitted to the power take-out shaft 43 via the hydraulically operated work clutch 45, and the driving force of the power take-out shaft 43 is transmitted to the cutting blade drive mechanism 22 of the grass cutting device 20 via the transmission shaft 46. Reportedly.

The link unit 10 includes a pair of left and right front swing links 11 that are vertically swingably supported by the vehicle body frame 4, a pair of left and right rear swing links 12 that are vertically swingably supported by the vehicle body frame 4, and left and right. It includes a pair of interlocking links 13.

The operating ends of the left and right front swing links 11 are connected to the front connecting member 23 of the cutting blade housing 21 of the mowing device 20, and the operating ends of the pair of left and right rear swing links 12 are behind the cutting blade housing 21. It is connected to the connecting member 24. The left interlocking link 13 is linked to the left front swing link 11 and the rear swing link 12, and the right interlocking link 13 is linked to the right front swing link 11 and the rear swing link 12. By connecting the pair of left and right front swing links 11 to the rotating shaft 14, the left and right front swing links 11 are configured to swing integrally, and the driving force of the lift cylinder 15 is connected to one of the front swing links 11. Is transmitted.

From this configuration, in the link unit 10, a pair of left and right front swing links 11 swing integrally by the driving force of the lift cylinder 15, and the operating ends of the left and right front swing links 11 and the left and right rear swing links As a result of the operating ends of 12 being displaced vertically with respect to the vehicle body frame 4, the mowing device 20 is raised and lowered.

The mowing device 20 is provided with ground gauge rings 25 at left and right positions on the front and rear sides of the cutting blade housing 21, and two cutting blades 26 are provided in parallel in the lateral direction inside the cutting blade housing 21. Further, the cutting blade housing 21 is provided with a cutting blade driving mechanism 22, and each cutting blade 26 is driven by the driving force from the cutting blade driving mechanism 22.

The grass cutting device 20 cuts grass by driving and rotating each cutting blade 26. Further, a grass cutting discharge duct 27 for discharging grass by the flow of wind generated by the drive rotation of the cutting blade 26 is formed from the upper part to the rear of the cutting blade housing 21. The grass cutting discharge duct 27 is arranged at a position where the self-propelled vehicle passes between the pair of left and right rear wheels 2 in the front-rear direction of the vehicle body, and the grass cut discharged from the cutting blade housing 21 is sent to the grass collecting container 32.

From such a configuration, the grass mower 100 lowers the grass cutting device 20 in a state where each cutting blade 26 is driven and rotated by setting the work clutch 45 in the transmission state, and causes the self-propelled vehicle to travel in this lowered state. As a result, the grass is cut with the ground gauge ring 25 touching the ground on the front and rear sides. Then, the cut grass is sent from the grass discharge duct 27 to the grass collecting container 32 by the transporting action of the wind from the cutting blade 26, and is collected in the grass collecting container 32.

[Grass recovery device and grass collection container]
As shown in FIGS. 1 to 3, the mowing recovery device 30 includes a pair of left and right support frames 31 provided at the rear end of the self-propelled vehicle, a link mechanism 33 supported by the support frames 31, and a link mechanism 33. It includes a pair of left and right elevating cylinders 34 to be driven, and a single dump cylinder 35 to control the posture of the weed collection container 32.

The link mechanism 33 includes a pair of left and right top links 33a that are swingably supported on the upper side of each of the left and right support frames 31, and a pair of left and right lowerers that are swingably supported on the lower side of each of the left and right support frames 31. It includes a link 33b and a container support 33c supported by a pair of top links 33a and a pair of lower links 33b at swinging ends.

The container support 33c is rotatably connected to the rear position of the grass collecting container 32 via a rotary support shaft 36 in a sideways posture. The left and right elevating cylinders 34 are interposed between the left and right support frames 31 and the left and right lower links 33b. The dump cylinder 35 is interposed between the arm portion that rotates integrally with the rotary support shaft 36 and the container support 33c.

The grass collecting container 32 uses a net-like material that allows air to flow through the left and right side walls, the ceiling wall, and the bottom wall. Further, a grass cutting inlet 32c is arranged at the front end of the grass collecting container 32, and the cutting grass supplied by the grass cutting discharge duct 27 is fed into the grass cutting inlet 32c. A mowing discharge port 32b is arranged at the rear end of the grass collecting container 32, and a lid 32a for opening and closing the mowing discharge port 32b is arranged at the rear end position.

The support arm 39 is swingably supported around the support shaft core in the lateral posture with respect to the left and right container frames 32f of the grass collecting container 32 via the connecting pin 39a, and the lid 32a is attached to the rear end of the support arm 39. It is equipped. An opening / closing link 37 is provided between the front end of the support arm 39 and the container support 33c.

1 and 2 show a grass collecting container 32 in a posture for collecting grass. In this posture, the left and right elevating cylinders 34 are in the contracted state, and the dump cylinder 35 is in the contracted state. By performing the mowing work in this state, the mowed grass mowed by the mowing device 20 is collected from the mowing discharge duct 27 via the mowing inlet 32c together with the flow of wind generated by the drive rotation of the mowing blade 26. The air is discharged from the mesh portion of the grass collecting container 32, and the cut grass is collected in the grass collecting container 32.

Further, when discharging the cut grass contained in the grass collecting container 32, as shown in FIG. 3, the left and right elevating cylinders 34 are extended and operated, and the link mechanism 33 is operated to cause the grass collecting container 32 to be self-propelled. The grass cutting discharge port 32b of the grass collecting container 32 is directed downward while operating rearward and upward. Subsequently, by extending the dump cylinder 35, the lid 32a is opened by the operation of the opening / closing link 37, and the grass is discharged from the grass discharge port 32b by its own weight.

[Mowing amount detector]
As shown in FIGS. 1 and 2, a grass cutting amount detecting device 60 is provided at a position below the grass cutting inlet 32c at the front portion of the grass collecting container 32. When the self-propelled vehicle detects that the grass collecting container 32 has reached the full state by the grass cutting amount detecting device 60, the self-propelled vehicle is filled by turning on the full warning lamp 51 provided in the operation panel 50 shown in FIG. Make the worker aware that it has been reached.

As shown in FIGS. 4 to 9, a sensor case 61 is provided at the front portion of the grass collecting container 32 and below the grass cutting inlet 32c. The mowing amount detection device 60 closes the sensor plate 62 fitted into the detection opening 61a of the front wall portion 61f of the sensor case 61, the shaft body 71 in a lateral posture supporting the lower end portion of the sensor plate 62, and the sensor plate 62. A coil-type spring 65 is provided as an urging member for urging in the direction of. Further, it is provided with a detection switch 66 as a detection unit for detecting that the sensor plate 62 has swung to the set posture.

The sensor case 61 includes left and right side wall portions 61s, a bottom wall portion 61b, and a front wall portion 61f, and a rectangular detection opening 61a is formed in the front wall portion 61f. The front wall portion 61f is in an inclined posture in which the upper end portion is displaced forward by a predetermined amount with respect to the lower end portion, and as shown in FIG. 4, when the sensor plate 62 is in the reference posture A (closed posture). The sensor plate 62 is in a posture along the front wall portion 61f.

A plate-shaped bracket 61c projecting forward is provided at a position outside (left and right) of the detection opening 61a at the lower portion of the front wall portion 61f of the sensor case 61, and a plate-shaped support protruding forward and arranged inside each bracket 61c. The plate 70 is provided on the sensor plate 62. By providing the shaft body 71 in a loosely fitted state in the through holes formed in each of the bracket 61c and the support plate 70, the sensor plate 62 is swingably supported around the shaft core X of the shaft body 71. The axis X is in a horizontal posture along the left-right direction.

The sensor plate 62 is formed by bending the pressure receiving body 62a so as to enter the detection opening 61a deeper toward the swinging end side (upper side) in the reference posture A and bending it forward on the upper end side of the pressure receiving body 62a. A wall body 62b and a plate-shaped side wall body 62c (an example of a side end portion of the sensor plate 62) attached to both side portions of the pressure receiving body 62a in the left-right direction are provided. The support plate 70 described above is integrally formed with the side wall body 62c at the lower end positions of the left and right side wall bodies 62c.

Further, a restricting body 62d that determines the posture of the sensor plate 62 by contacting the front wall portion 61f in the reference posture A is formed on the side wall body 62c. Further, in the region connecting the left and right restricting bodies 62d, a shielding body 75 arranged without a gap with the upper wall body 62b is provided. The shield 75 is provided at the swinging end of the sensor plate 62 so as to overlap the upper outer side of the opening edge of the detection opening 61a when the sensor plate 62 is in the reference posture A (closed posture). There is.

The detection switch 66 is provided on the outer surface of one side wall portion 61s of the sensor case 61, and the contact body 62e for operating the detection switch 66 is provided in a posture of projecting outward from the front side of the sensor plate 62. The detection switch 66 has a function of turning off when the contact body 62e is in contact with the operated portion of the detection switch 66 and turning on when the contact body 62e is separated from the operated portion. ing.

A locking arm 63 for locking one end of the spring 65 is provided on the front surface side of the sensor plate 62, and a holding member 72 for holding the other end of the spring 65 is provided at the upper position of the sensor case 61. .. A plurality of locking portions 63a are formed on the locking arm 63, and by selecting any one of the locking portions 63a and providing the spring 65, an urging force acting on the sensor plate 62 toward the closed posture. Can be adjusted.

With such a configuration, when the amount of grass collected in the grass collecting container 32 increases, the weight of the grass acts on the pressure receiving body 62a of the sensor plate 62, so that the sensor plate 62 is attached with a spring 65. The upper end side (swinging end) swings forward (outwardly) about the axis X against the force.

5 and 7 show the sensor plate 62 that has reached the detection posture B, and when the swing amount of the sensor plate 62 reaches a predetermined amount, the detection switch 66 reaches the detection state and is full based on this detection. Since the alarm lamp 51 lights up, the operator can recognize that the amount of grass collected in the grass collecting container 32 has reached a predetermined value. The detection posture B shown in the drawing shows a posture in which the detection switch 66 swings by a sufficient amount to reach the detection state.

In the grass cutting amount detecting device 60, a slight gap is formed between the upper wall body 62b of the sensor plate 62 and the opening edge of the upper part of the detection opening 61a. Further, a gap is also formed between the outer surface of the side wall body 62c (the side end portion of the sensor plate 62) constituting the sensor plate 62 and the opening edge of the detection opening 61a in the left-right direction. Further, since the pressure of the air supplied from the mowing discharge duct 27 to the grass collecting container 32 acts on the portion of the sensor plate 62, the sensor plate 62 is used as a reference due to the vibration caused by the traveling of the self-propelled vehicle and the action of the air pressure. Even in the posture A, grass may leak from the upper position of the detection opening 61a or from the gap. This leakage of grass becomes more remarkable when the sensor plate 62 swings due to the pressure of the grass.

In order to suppress this leakage, the above-mentioned shield 75 is provided on the swing end side (upper end side) of the sensor plate 62. Further, in order to suppress the leakage of grass from the swinging end side (upper end side) of the sensor plate 62, the phenomenon that the grass moves toward the upper opening edge of the detection opening 61a is suppressed inside the sensor case 61. The regulation member 76 is provided. Further, a leakage suppressing member 77 made of a brush is provided on the outer surface (side end portion) of the side wall body 62c.

As shown in FIGS. 6 to 9, the regulating member 76 is provided on the front wall inner surface 61fr at a position adjacent to both side portions of the pressure receiving body 62a in the front wall portion 61f. The regulating member 76 is integrally formed with a base portion 76a, a regulating portion 76b that stands up so as to be orthogonal to the front wall inner surface 61fr, and an inclined portion 76c.

In this regulation member 76, the base portion 76a is fixed to the inner surface 61fr of the front wall by spot welding or the like in a side view, and the regulation portion 76b is arranged below the swing end of the pressure receiving body 62a of the sensor plate 62. It is arranged along the opening edge of the front wall inner surface 61fr so that the inclined portion 76c is arranged above the portion 76b.

As shown in FIG. 9, the leakage suppressing member 77 is provided so that a large number of fibers 77b stand up on one surface of the belt-shaped portion 77a. As shown in FIG. 8, the leakage suppressing member 77 has a belt-shaped portion 77a fixed to the outer surfaces of the left and right side wall bodies 62c with screws, rivets, or the like, or is fixed with an adhesive, and is a fiber. The 77b is provided in a state of being lightly contacted with the facing portions of the left and right opening edges of the detection opening 61a.

When the shield 75 is provided so that the grass leaks from the gap between the opening edge of the upper end of the detection opening 61a of the sensor case 61 and the swinging end of the sensor plate 62, the grass is shielded 75. Leakage is suppressed by contacting with.

In this way, by providing the regulating member 76, the mowing that tries to move in the direction of the swinging end of the sensor plate 62 inside the sensor case 61 comes into contact with the regulating portion 76b of the regulating member 76, so that the sensor plate 62 Movement in the direction of the swinging end of the is restricted. That is, since the mowing has a predetermined length and exists in a state where many mowings are entwined with each other, the mowing is directed to the swinging end of the sensor plate 62 inside the sensor case 61 by providing the regulating member 76. The phenomenon of moving to is regulated, and by restricting the movement in this way, the phenomenon that the grass reaches the gap is suppressed and leakage is prevented.

Further, the leak suppressing member 77 is arranged in a state where the leak suppressing member 77 fills a gap between the outer surfaces of the left and right side wall bodies 62c of the sensor plate 62 and the left and right opening edges of the detection opening 61a of the sensor case 61. .. As a result, the leakage suppressing member 77 can prevent the phenomenon that the mowing moves toward this gap.

[Action and effect of the embodiment]
In this way, the grass cutting amount detecting device 60 fits the sensor plate 62 into the detection opening 61a of the sensor case 61, and the sensor plate 62 is moved to the lower shaft core X by the action of the weight of the grass collected in the grass collecting container 32. It is possible to detect the amount of grass collected from this amount of shaking.

Further, in this configuration, since the sensor plate 62 is swingably fitted into the detection opening 61a, a gap is formed between the opening edge of the detection opening 61a and the outer circumference of the sensor plate 62. In particular, by providing the regulating member 76 on the left and right front wall inner surfaces 61fr of the left and right front wall portions 61f on the inner surface of the sensor case 61, the sensor plate 62 swings forward from the reference posture A, so that the sensor plate 62 Even if the grass is likely to leak from the upper end, the regulating member 76 suppresses the leak of the grass. Further, the shield 75 suppresses the leakage of grass from the upper end of the sensor plate 62.

The leak suppressing member 77 is in a state where the leak suppressing member 77 fills the gap between the outer surfaces of the left and right side wall bodies 62c of the sensor plate 62 and the left and right opening edges of the detection opening 61a of the sensor case 61. Suppress the leakage of grass from the ground.

As described above, the shielding body 75 and the regulating member 76 do not interfere with the swinging of the sensor plate 62 when the sensor plate 62 swings, so that the sensor plate 62 can be smoothly operated. Further, since the leak suppressing member 77 is only slightly in contact with the opening edge of the detection opening 61a when the sensor plate 62 is operated, it does not hinder the smooth operation of the sensor plate 62.

In particular, since the leakage of grass is suppressed by providing the shielding body 75, the regulating member 76, and the leakage suppressing member 77, it is not necessary to design the gap between the sensor plate 62 and the detection opening 61a to be small. The manufacturing of the sensor plate 62 and the sensor case 61 is not required to have high accuracy, and the manufacturing becomes easy.

[Another Embodiment]
The present invention may be configured as follows in addition to the above-described embodiment (those having the same functions as those in the embodiment are designated by the same number and reference numeral as those in the embodiment).

(A) As the regulating member 76, a plurality of regulating portions 76b that are serrated in a side view are provided. With such a configuration, the flow of mowing inside the sensor case 61 is further suppressed, and the leakage of mowing is suppressed.

(B) The leakage suppressing member 77 is supported at the opening edge portion of the detection opening 61a of the sensor case 61 facing the side wall body 62c of the sensor plate 62. In this configuration, for example, when the leakage suppressing member 77 is composed of a brush as in the embodiment, the belt-shaped portion 77a is fixed to the opening edge portion, and a large number of fibers 77b are arranged in contact with the side wall body 62c. Will be done. The leakage suppressing member 77 may be provided on both the outer surface (side end portion) of the side wall body 62c of the sensor plate 62 and the detection opening 61a of the sensor case 61.

(C) As the leak suppressing member 77, a sealing member made of a rubber material or a resin material that can be flexibly deformed is used. Even if the leakage suppressing member 77 made of a material that can be flexibly deformed in this way is used, the leakage of grass is suppressed even more satisfactorily.

The present invention can be used in a grass cutting amount detecting device that detects the amount of grass cut contained in a grass collecting container in a grass mower or the like.

32 Grass collecting container 61a Detection opening 62 Sensor plate 62c Side end 65 Spring (biasing member)
66 Detection switch (detection unit)
75 Shielding body 76 Regulatoring member 77 Leakage suppressing member A Reference posture (blocking posture)
X axis core

Claims (3)

A sensor plate that is arranged at a position to be fitted into the detection opening formed in the grass collecting container and is swingably supported by the grass collecting container about the axis.
An urging member that urges the sensor plate in the closing direction,
It is provided with a detection unit that detects the swing when the sensor plate swings against the urging force of the urging member due to the weight of the cut grass contained in the grass collecting container.
The sensor plate has a structure in which the swinging end projects outward of the detection opening due to the action of the weight of the grass, and the swinging end of the opening edge of the detection opening is relative to the inner surface side of the grass collecting container. A grass cutting amount detection device equipped with a regulating member that regulates the movement of grass in the direction of. 1. A claim 1 in which, when the sensor plate is in a closed posture due to the urging force of the urging member, a shield body overlapping on the outer surface side of the opening edge of the detection opening is provided at the swinging end of the sensor plate. The mowing amount detection device described in 1. The shaft core is arranged in a horizontal position under the sensor plate.
A leak suppressing member made of a material that can be flexibly deformed is provided for one of the side end portion of the sensor plate in the left-right direction and the portion of the opening edge of the detection opening facing the side end portion. The mowing amount detecting device according to claim 1 or 2.

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