JP7451289B2 - Riding groove cutting machine - Google Patents

Description

The present invention relates to a riding groove cutting machine.

2. Description of the Related Art Conventionally, riding ditch cutting machines have been known that cut grooves in fields (paddy fields) to quickly drain water from them. In this riding groove cutting machine, a worker sits astride a seat provided on the main body frame, and the machine cuts grooves in the field using the groove cutting section at the rear of the main body frame while the operator moves by rotating the wheels driven by the engine. It is. Patent Document 1 below describes a device in which the groove section rotates (rotates) to change the direction of travel.

Patent No. 4032109

However, in the riding groove cutting machine described in Patent Document 1, the groove cutting part may be removed depending on the field, and stable running may not be possible.

The present invention has been made to solve these problems, and an object of the present invention is to provide a riding groove cutter that can suppress sudden removal of the groove section and can run stably. .

In the riding groove cutting machine (100) according to the present invention, an operator sits on a seat (12) provided on a main body frame (9) and moves the groove cutting part (7) which is rotatable while moving by the rotation of wheels (6). A riding grooving machine (100) that cuts grooves by means of a grooving section shaft (8) connected to the grooving section (7) and extending upward, and a rotating section (31a) provided on the grooving section shaft (8). and a groove shaft rotation support pipe (11) that is provided at the rear of the main body frame (9) and rotatably connects the groove shaft (8). is provided with either a male thread part (50) or a female thread part (52), and one thread part (50) is provided with a male thread part (50) or a female thread part (52). ) is screwed together, the grooved part shaft rotation support pipe (11) is sandwiched between the other threaded part (52) and the rotating part (31a), and the other threaded part (52) is screwed together. It is characterized in that the grooved part shaft (8) can be pulled up by tightening the part (52).

According to such a riding groove cutting machine (100), either one of the male thread part (50) and the female thread part (52) provided on the upper part of the groove cutting part shaft (8). The other threaded part (52) is screwed into the main body frame (9) between the rotating part (31a) provided on the grooved part shaft (8) and the other threaded part (52). A groove shaft rotation support pipe (11) provided at the rear of the groove shaft and rotatably connects the groove shaft (8) is sandwiched therein. Then, as the grooved part shaft (8) is pulled up by tightening the other screw part (52), the tightening force increases, the sliding resistance of the grooved part shaft (8) increases, and the grooved part (7) suddenly moves. This can prevent people from being taken by other people. As a result, stable running can be achieved. In addition, depending on the degree of tightening of the other threaded part (52), the amount of increase in sliding resistance of the grooved part shaft (8) can be changed according to the operator's preference, and the grooved part (7) can be adjusted to suit the field. The operation can be adjusted.

Here, if provided with elastic bodies (25a, 25b) that pull the groove shaft (8) toward a neutral position around the rotation axis of the groove shaft (8), ) rotates around the rotation axis from the neutral position, the grooved part shaft (8) is elastically urged to return to the neutral position by the elastic body (25a, 25b), so that the grooved part (7) It is said that it is easy to return to the neutral position and maintain stable straight-line performance. On the other hand, if the elastic body (25a, 25b) quickly returns the grooved shaft (8) to the neutral position, the sliding resistance of the grooved shaft (8) is increased by tightening the other screw (52). Since it is raised, rapid rotation of the grooved portion (7) is suppressed, and the direction of movement changes slowly. As a result, stable running can be achieved.

As described above, according to the present invention, it is possible to prevent the grooved portion from being suddenly removed, and it is possible to perform stable running.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the riding groove cutting machine based on 1st Embodiment of this invention. FIG. 2 is a schematic perspective view of the riding groove cutter shown in FIG. 1 viewed from the rear and upper side. FIG. 3 is a longitudinal cross-sectional view showing the handle, the handle shaft, and the handle shaft rotation range regulating means in FIGS. 1 and 2, and is a diagram showing a case where the handle is fixed. FIG. 4 is a plan view showing an upper plate and a knob bolt that constitute the handle shaft rotation range regulating means in FIG. 3; FIG. 4 is a plan view showing a middle plate constituting the handle shaft rotation range regulating means in FIG. 3; FIG. 4 is a plan view showing a lower plate constituting the handle shaft rotation range regulating means in FIG. 3; FIG. 2 is a partially cross-sectional side view showing the groove section, the groove section shaft, the groove section axis rotation support pipe, the tightening adjustment section, the groove section rotation range regulating means, the neutral return mechanism, etc. in FIG. 1; FIG. 2 is a partially cross-sectional exploded side view showing the grooved part shaft, rotating part, grooved part shaft rotation support pipe, tightening adjustment part, etc. in FIG. 1; 8 is a plan view showing the neutral return mechanism in FIG. 7. FIG. FIG. 8 is a view taken along the line XX in FIG. 7. 8 is a rear view showing the groove rotation range regulating means in FIG. 7. FIG. It is a top view which shows the phase relationship of a wheel and a groove part, and is a figure which shows the state where a wheel and a groove part are located in a neutral position. It is a top view which shows the phase relationship of a wheel and a groove part, and is a figure which shows the state which turned the wheel clockwise from a neutral position. It is a top view which shows the phase relationship of a wheel and a groove part, and is a figure which shows the state which turned the wheel counterclockwise from a neutral position. FIG. 7 is a partially cross-sectional exploded side view showing a grooving part shaft, a rotating part, a grooving part shaft rotation support pipe, a tightening adjustment part, etc. of a riding grooving machine according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of a riding groove cutter according to the present invention will be described with reference to the accompanying drawings. 1 to 14 show a first embodiment of the present invention, and FIG. 15 shows a second embodiment of the present invention. In each figure, the same elements are denoted by the same reference numerals, Duplicate explanations will be omitted.

First, a first embodiment shown in FIGS. 1 to 14 will be described. 1 and 2 are views showing a riding groove cutter according to a first embodiment of the present invention, and FIG. 3 is a longitudinal cross-sectional view showing a handle, a handle shaft, and a handle shaft rotation range regulating means, and a handle fixed to the handle. FIGS. 4 to 6 are diagrams showing the handle shaft rotation range regulating means, and FIG. 7 is a diagram showing the groove section, the groove section shaft, the groove section shaft rotation support pipe, the tightening adjustment section, FIG. 8 is a partial cross-sectional side view showing the groove rotation range regulating means, neutral return mechanism, etc.; FIG. An exploded side view, FIG. 9 is a plan view showing the neutral return mechanism, FIG. 10 is a view along the X-X arrow in FIG. 7, and FIG. 11 is a rear view showing the groove rotation range regulating means, FIGS. 12 to 14. 2A and 2B are plan views showing the phase relationship between a wheel and a grooved portion. In the following explanation, words indicating directions such as "front", "rear", "top", "bottom", "left", and "right" are used when the riding groove cutter is placed on a horizontal surface. The forward direction of the vehicle is defined as the front.

As shown in FIGS. 1 and 2, the riding groove cutting machine 100 has a handle 1 that is gripped by the operator, and a handle shaft 2 (see FIG. 3) that extends obliquely downward and forward from the bottom of the handle 1. , a connecting bracket 3 connected to the lower end of the handle shaft 2 and offset toward the front in the drawing and extending downward at the same inclination as the handle shaft 2; a gear case 4 connected to the connecting bracket 3; and a hub inside the gear case 4. Wheels 6 are connected to each other and are provided with flat plate-shaped anti-slips 5 at equal intervals along the circumferential direction of the outer periphery, and at the rear thereof, a groove cutting part 7 for cutting a groove in the field, and a groove cutting part 7 for cutting a groove in the field. A groove shaft 8 is connected to the portion 7 and extends diagonally upward and rearward.

Further, the riding groove cutting machine 100 includes a main body frame 9 extending backward in the front-rear direction. A handle shaft rotation support pipe 10 is provided at the front of the main body frame 9, and the handle shaft 2 is inserted into the handle shaft rotation support pipe 10 and rotatably connected thereto.

A seat 12 for an operator to sit astride is provided on the main body frame 9 at an upper portion approximately at the center in the axial direction. The seat 12 is vertically adjustable. Further, the rear side of the main body frame 9 from the center in the axial direction is formed into a substantially U-shape so that a transmission shaft housing pipe 13 (to be described later) enters and can swing in the left-right direction (perpendicular to the plane of the paper) with the handle shaft 2 as the rotation axis. It is provided with a curved portion 14 that curves so as to bulge laterally (towards the back of the page). A grooved shaft rotation support pipe 11 is provided at a rear end portion of the main body frame 9 extending rearward from the curved portion 14 .

The groove section 7 has a tapered V-shape in a plan view, and is configured by connecting flat plates so as to form a V-shaped groove in a front-rear view. A flat plate extending horizontally outward along a V-shape is connected to the upper end. When cutting the groove with the groove cutting part 7, the tip of the V-shaped groove is dug into the field, and the soil pushed upward and outside of the V-shaped groove is spread to the left and right.

The gear case 4 accommodates a curved bevel gear, etc., and a transmission shaft accommodation pipe 13 is connected to the gear case 4, which accommodates a transmission shaft therein and extends rearward in the front-rear direction. A prime mover 15 is connected to the rear end. The transmission shaft housing pipe 13 extends rearward while being slightly inclined to the right (backward side in the drawing) by the curved bevel gear of the gear case 4. The prime mover 15 is disposed behind the seat 12, and the transmission shaft housing pipe 13 is disposed so as to pass under the seat 12 and inside the curved portion 14 of the main body frame 9 to reach the prime mover 15. The driving force of the prime mover 15 is then transmitted to the hub of the gear case 4 via the transmission shaft, and the wheels 6 rotate. Note that the connection bracket 3 and the transmission shaft housing pipe 13 are connected by a reinforcing frame 29.

As shown in FIG. 3, the handle shaft 2 is rotatably supported via a flange type bearing (lube-free bearing) 16 housed in the handle shaft rotation support pipe 10. As shown in FIGS. 1 to 3, on the front surface of the bracket portion 37 located below the handle shaft rotation support pipe 10 in the connection bracket 3 and extending in the left-right direction, there is a bracket portion 37 for regulating the rotation range of the handle shaft 2. A handle shaft rotation range regulating means 17 is provided.

As shown in FIG. 3, the handle shaft rotation range regulating means 17 is fixed to the upper plate 18 fixed to the front surface of the handle shaft rotation support pipe 10 and to the front surface of the bracket part 37, and is spaced below the upper plate 18. It includes a middle plate 19 and a lower plate 20 which are arranged one on top of the other.

As shown in FIGS. 3 and 4, a knob bolt 21 is screwed into the upper plate 18. As shown in FIGS. As shown in FIG. 5, the middle plate 19 is formed with a long hole 22 that extends in an arc shape in plan view with the handle shaft 2 as the rotation axis, and the tip of the knob bolt 21 enters into the long hole 22 and is loosely fitted. It is said that it can be placed. As shown in FIG. 6, the lower plate 20 has a through hole 23 formed below the knob bolt 21 into which the tip of the knob bolt 21 can enter. Then, as shown in FIG. 3, the knob bolt 21 is screwed into the upper plate 18, and the tip of the knob bolt 21 is inserted into the long hole 22 (see FIG. 5) of the middle plate 19, thereby connecting the handle shaft 2 and the handle 1. is rotatable. The rotation range of the handle shaft 2 and the handle 1 is the range in which the left and right end portions of the elongated hole 22 of the middle plate 19 move until they abut against the tip of the knob bolt 21.

Further, by further screwing the knob bolt 21 into the upper plate 18 and inserting the tip of the knob bolt 21 into the through hole 23 (see FIG. 6) of the lower plate 20, the handle shaft 2 and the handle 1 can be fixed non-rotatably. . Note that FIG. 3 shows a case where the handle shaft 2 and the handle 1 are fixed.

Here, in this embodiment, the tip of the knob bolt 21 does not enter the through hole 23 of the lower plate 20, but is loosely fitted into the long hole 22 of the middle plate 19. When rotated (steering), the wheels 6 turn left and right (counterclockwise, clockwise) about the handle shaft 2, and the transmission shaft housing pipe 13 and prime mover 15 turn left and right (counterclockwise). , clockwise). Note that a lever bolt or an index plunger may be used instead of the knob bolt 21.

Further, as shown in FIGS. 1 and 2, a neutral return mechanism 24 is interposed between the transmission shaft housing pipe 13 and the grooved shaft 8. As shown in FIGS. 1, 7, and 9, the neutral return mechanism 24 includes a coil as an elastic body that draws the transmission shaft housing pipe 13 and the grooved shaft 8 toward each other toward a neutral position around the rotation axis. They are connected via springs 25a and 25b. A front adjustment plate 26 extending in the left-right direction is connected to the transmission shaft housing pipe 13, and a rear adjustment plate 27 extending in the left-right direction is fixed to the grooved shaft 8 via a rotating bracket 31. , the front adjustment plate 26 and the rear adjustment plate 27 are provided with a plurality of locking portions (locking holes) 28 spaced apart along the left-right direction for locking the ends of the coil springs 25a, 25b. (See Figure 9).

As shown in FIGS. 1 and 2, the rotation bracket 31 is formed of a flat plate and has an L-shape. In the rotating bracket 31, the front end of a bottom plate 31a serving as a rotating part forming an L-shape is fixed to the rear end of the adjustment plate 27 on the rear side, and the grooved part shaft 8 penetrates and is fixed to the bottom plate 31a. As shown in FIGS. 7 and 8, the upper part of the groove shaft 8 is a male threaded portion 50. As shown in FIGS.

As shown in FIGS. 2 and 9, the coil springs 25a and 25b are provided on the left and right sides of a straight line connecting the respective rotational axes of the handle shaft 2 and the groove shaft 8 in plan view, and here, The right coil spring 25a is arranged below the front and rear adjustment plates 26, 27, and the left coil spring 25b is arranged above the front and rear adjustment plates 26, 27, respectively.

Further, the groove cutter 7 connected to the transmission shaft housing pipe 13 which is oblique in plan view via the neutral return mechanism 24 is positioned at a neutral position facing forward in the traveling direction of the riding groove cutter 100 ( The locking position of the left coil spring 25b with respect to the front adjusting plate 26 is offset to the left so as to match the neutral position of the wheel 6), and exerts a stronger tensile force than the right coil spring 25a.

Further, as shown in FIGS. 7 and 8, the grooved part shaft rotation support pipe 11 is disposed on the bottom plate 31a, is fitted onto the grooved part shaft 8, and is housed inside thereof so as to face each other vertically. It is rotatably connected to the groove shaft 8 via two flange type bearings (oil-free bearings) 36, 36.

A washer 51 is arranged on the grooved part shaft rotation support pipe 11 so as to be fitted onto the grooved part shaft 8, and a locking bearing nut 52 as a female screw part arranged on the washer 51 is grooved. By screwing into the male screw portion 50 of the shaft 8, the grooved shaft rotation support pipe 11 and the washer 51 are sandwiched between the locking bearing nut 52 and the bottom plate 31a. Here, the locking bearing nut 52 and the male screw part 50 constitute a tightening adjustment part for increasing the tightening force by pinching and increasing the sliding resistance (rotational resistance) of the grooved shaft 8. Note that instead of the locking bearing nut 52, a hard lock nut, a double nut, or the like may be used, and these will be collectively referred to simply as the nut 52 hereinafter.

In addition, a regulating bracket 31b that constitutes the rotation bracket 31 and protrudes upward from the rear end of the bottom plate 31a, and a bolt 32 as a protruding member that protrudes rearward from the grooved shaft rotation support pipe 11. , a groove rotation range regulating means 30 for regulating the rotation range of the groove section 7 is configured.

As shown in FIGS. 2, 7, 10, and 11, the regulation bracket 31b includes a recess 33 in its upper portion that is open upward and extends in the left-right direction, and the bolt 32 enters the recess 33. Therefore, when the grooved part 7 and the grooved part shaft 8 rotate, the regulation bracket 31b rotates around the grooved part shaft rotation support pipe 11. The rotation range of the grooved part 7 and the grooved part shaft 8 is the range in which the regulation bracket 31b rotates until the bolt 32 abuts the left and right ends of the regulation bracket 31b forming the recessed part 33.

When using the riding groove cutting machine 100 having such a configuration, an operator sits astride the seat 12, drives the prime mover 15, and transfers the driving force of the prime mover 15 to the transmission shaft housing pipe 13. The power is transmitted to the gear in the gear case 4 and the inner hub through the housed transmission shaft, and the wheel 6 rotates as a driving wheel.

At this time, the handle shaft 2 and the groove shaft 8 are located at neutral positions around the rotation axis, and as shown in FIG. 12, the direction of the wheel 6 and the direction of the groove section 7 are the same, so that The riding groove cutting machine 100 moves forward. At this time, the weight of the riding grooving machine 100 and the worker is added to the wheels 6 and the grooving section 7, so that the grooving section 7 that follows the wheels 6 forms a groove in the field.

When the handle 1 is rotated while the riding groove cutting machine 100 is moving forward, the handle shaft 2, the connecting bracket 3, the wheels 6, the gear case 4, the transmission shaft housing pipe 13, and the prime mover 15 move around the rotation axis of the handle shaft 2. For example, when the handle 1 is turned to the right, the wheels 6 turn to the right and the direction of movement of the riding groove cutter 100 is changed to the right, as shown in FIG. Further, for example, when the handle 1 is turned to the left, the wheels 6 turn to the left as shown in FIG. 14, and the traveling direction of the riding groove cutting machine 100 is changed to the left.

At this time, the grooved part shaft 8 is connected to the transmission shaft housing pipe 13 via the neutral return mechanism 24 having coil springs 25a and 25b, so the grooved part 7 is connected to the rotation axis of the grooved part shaft 8. When the handle 1 is turned to the right, it rotates counterclockwise, as shown in FIG. 13, and when it is turned to the left, it rotates clockwise, as shown in FIG. 14. That is, the rotation phase of the handle shaft 2 and the rotation phase of the groove cutter 7 are opposite to each other, and the riding groove cutter 100 moves with the wheels 6 and the groove cutter 7 facing in opposite directions.

In this state, the neutral return mechanism 24 acts so that the operating direction of the handle 1 does not remain as it is, and the coil springs 25a and 25b rotate the handle 1 and the grooved part 7 in the opposite direction to the above, and the handle 1 is moved to the neutral position. to return to.

Here, depending on the field, the groove section 7 may be suddenly removed. In this embodiment, the problem is solved by a tightening adjustment section using the nut 52 and the male screw section 50. Specifically, the nut 52 sandwiching the grooved portion shaft rotation support pipe 11 and the washer 51 is tightened between the bottom plate 31a and the nut 52.

Then, the grooved part shaft 8 is pulled up and the tightening force increases, so that the sliding resistance of the grooved part shaft 8 increases, and it is possible to suppress the grooved part 7 from being suddenly removed. As a result, stable running can be achieved. Further, by adjusting the degree of tightening of the nut 52, the amount of increase in the sliding resistance of the grooved part shaft 8 can be changed according to the operator's preference, and the operation of the grooved part 7 can be adjusted to suit the field.

Also, since the coil springs 25a and 25b are provided to pull the grooved portion 7 toward the neutral position around the rotational axis of the grooved portion shaft 8, the grooved portion shaft 8 is moved from the neutral position around the rotational axis of the grooved portion shaft 8. When it rotates, the coil springs 25a and 25b spring the grooved part shaft 8 to return to the neutral position, making it easy to return the grooved part 7 to the neutral position, and maintaining stable straightness. If the coil springs 25a and 25b rapidly return the grooved portion 7 to the neutral position, the sliding resistance of the grooved portion shaft 8 will increase due to the tightening of the nut 52 described above. Rapid rotation is suppressed and the direction of travel changes slowly. As a result, stable running can be achieved.

In addition, by releasing the threaded engagement of the nut 52 with the male threaded portion 50, the grooved portion shaft rotation support pipe 11, etc. can be removed, making it easy to replace and maintain parts such as the flange type bearing 36, which is a sliding part. can be done.

Further, according to this embodiment, the following actions and effects are also achieved. That is, since the coil springs 25a and 25b are provided on both the left and right sides of the straight line connecting the respective rotation axes of the handle shaft 2 and the rotation bracket 31 (grooved portion 7) in a plan view, Even when the steering wheel is turned, the handle 1 can be easily returned to the neutral position.

In addition, since the handle shaft 2 and the rotating bracket 31 (grooved portion 7) are drawn toward each other toward the neutral position around the rotation axis by the coil springs 25a and 25b, the rotation phase of the handle shaft 2 and the groove The rotation phase of the cut portion 7 can be set to be in the opposite phase, the wheel 6 and the groove cut portion 7 face in opposite directions, the rotation radius and inner ring difference can be reduced, and tight turning can be achieved.

In addition, since it is equipped with a handle shaft rotation range regulating means 17 that regulates the rotation range of the handle shaft 2, the rotation range of the handle 1 is regulated, and interference with parts and unnecessary loads due to excessive turning of the handle 1 are prevented. can.

Furthermore, since the groove cutting part rotation range regulating means 30 is provided to regulate the rotation range of the groove cutting part 7, the rotation range of the groove cutting part 7 is regulated, and damage to parts due to excessive rotation of the groove cutting part 7 can be prevented. Unnecessary load can be suppressed.

In addition, by screwing in the knob bolt 21 and inserting the tip end into the through hole 23 of the lower plate 20, and fixing and locking the handle shaft 2, the grooved part 7 can be lifted and the wheel 6 can be rolled while the handle 1 does not turn. Since the riding groove cutting machine 100 can be moved while traveling, it is easy to transport and move the riding groove cutting machine 100 in the field, and it is safe because the handle 1, wheels 6, transmission shaft housing pipe 13, and prime mover 15 do not move.

Furthermore, by changing the mounting positions of the coil springs 25a and 25b relative to the locking portions 28 of the front adjustment plate 26 and rear adjustment plate 27 of the neutral return mechanism 24, the angles of the coil springs 25a and 25b can be adjusted and the load reduced. Since the handle 1 can be changed, the difference in operating performance can be reduced even in fields where the handle 1 is easily taken off.

FIG. 15 is a partially cross-sectional exploded side view showing the grooving part shaft, the bottom plate as a rotating part, the grooving part shaft rotation support pipe, the tightening adjustment part, etc. of the riding grooving machine according to the second embodiment of the present invention. It is.

This second embodiment differs from the first embodiment in that the flange-type bearing 36 of the grooved part shaft rotation support pipe 11 is eliminated, and the groove between the bottom plate 31a and the grooved part shaft rotation support pipe 11 is This is because thrust bearings 53, 53 are provided between the cut shaft rotation support pipe 11 and the washer 51, respectively.

It goes without saying that the second embodiment configured in this manner also has the same functions and effects as the first embodiment.

Although the present invention has been specifically described above based on the embodiments thereof, the present invention is not limited to the above embodiments. For example, in the above embodiments, the groove cut portion 7 is Although it is constructed by consecutively arranging flat plates to form a V-shaped groove when viewed in the front-rear direction, it may also be in the shape of an abacus bead.

Further, in the above embodiment, the upper part of the grooved part shaft 8 is used as the male threaded part 50, and the nut 52 screwed into the male threaded part 50 is used as the female threaded part. A female threaded portion may be provided in a recess, and instead of the nut 52, a bolt that is screwed into the female threaded portion may be used as the male threaded portion.

Further, in the embodiment described above, the neutral return mechanism 24 that returns the handle 1 and the groove cutter 7 to the neutral position is provided, but the riding groove cutter is equipped with the neutral return mechanism that returns only the groove cutter 7 to the neutral position. It is also applicable to It can also be applied to riding groove cutting machines that do not have a neutral return mechanism, and in short, regardless of whether the handle 1 is rotatable or not, the groove cutting part 7 is rotatable (swivelable). Applicable to machines.

6...Wheel, 7...Groove section, 8...Groove section shaft, 9...Body frame, 11...Groove section shaft rotation support pipe, 12...Seat, 25a, 25b...Coil spring (elastic body), 31a...Bottom plate (rotating part), 50...male thread part, 52... nut (female thread part), 100...riding groove cutting machine.

Claims (2)

In a riding groove cutting machine (100) in which a worker sits on a seat (12) provided on a main body frame (9) and cuts grooves with a rotatable groove cutting part (7) while moving by rotation of wheels (6). ,
a groove shaft (8) connected to the groove section (7) and extending upward;
a rotating part (31a) provided on the groove shaft (8);
A groove shaft rotation support pipe (11) provided at the rear of the main body frame (9) and rotatably connects the groove shaft (8),
A threaded portion (50), either a male threaded portion (50) or a female threaded portion (52), is provided on the upper part of the groove shaft (8),
The other threaded part (52) of the male threaded part (50) or the female threaded part (52) is screwed into the one threaded part (50), thereby rotating with the other threaded part (52). The grooved part shaft rotation support pipe (11) is sandwiched between the part (31a),
A riding groove cutter (100) characterized in that the groove cutter shaft (8) can be pulled up by tightening the other threaded portion (52). The vehicle according to claim 1, further comprising elastic bodies (25a, 25b) that pull the groove shaft (8) toward a neutral position around the rotation axis of the groove shaft (8). Grooving machine (100).

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