JP2005304428A - Clip pitch-variable type lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable lawn mowing operation different in clip pitches by one lawn mower by constituting a lawn mower so that an operator simply enables change of clip pitch according to the purpose of lawn mowing operation. <P>SOLUTION: In the lawn mower constituted so as to each branch and transmit the power of an engine E loaded on a machine body F through first and second power transmission passages Q<SB>1</SB>and Q<SB>2</SB>of a transmission apparatus D to a single reel cutter K and a drum wheel 3 and reap the lawn, a transmission T enabling operation from the outside is built in at least either one of first and second power transmission passages Q<SB>1</SB>and Q<SB>2</SB>of the transmission D and a clip pitch P which is a distance in which the machine body F travels is changed until reaping by the following reel blade 7 is started after reaping of lawn is started by cooperation of a reel blade 7 of a rotating reel cutter K with a bed knife 8 of the machine body F by operation of the transmission T. As a result, the lawn mower enables lawn mowing operation different in the clip pitch P by the same lawn mower. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lawn mower provided with a single reel cutter for mowing a lawn such as a green of a golf course, and more particularly to a clip pitch variable lawn mower capable of easily changing a “clip pitch”.

  As one of lawn mowers (also referred to as “single mower” in the industry) provided with a single reel cutter, the one described in Patent Document 1 is known. As shown in FIGS. 1 to 3, the self-propelled lawn mower is driven by a reel cutter through the clutch 12 and a transmission device D provided on the side of the machine F. K and the drum wheel 3 are branched and transmitted, and the drum wheel 3 is grounded on the grass surface and driven to rotate, so that the machine body F moves forward at the running speed (V) and (N) reel blades are The reel cutter K is rotated at a rotation speed (R) per unit time, and the lawn is cut by the rotation of the reel cutter K in the down cut direction.

  Here, when the body F travels at the traveling speed (V) and the lawn is reaped with the reel cutter K having (N) reel blades rotated at the rotational speed (R), the clip pitch (P ) Is represented by [P = (C × V) / (R × N)]. Note that (C) is a coefficient. That is, the clip pitch means that the airframe F starts to cut the lawn by the cooperation of the reel blade of the rotating reel cutter and the bed knife of the airframe F and then starts to cut the next reel blade. This means the distance traveled and is also called “cutting frequency”. For lawn mowers with a single reel cutter for mowing the golf course green, a typical value is 4.0 to 8.0 mm. It is.

  For this reason, the shorter the “clip pitch”, the finer the grass is cut, and the better the lawn is cut (the better the cut grass looks). In recent golf courses such as greens of golf courses, the “clip pitch” is often shortened in order to improve the appearance. As described above, when the “clip pitch” is shortened, the cutting state of the lawn is improved and the appearance is improved. However, the degree of wear of the reel cutter K is increased, and the frequency of wrapping the reel cutter K is increased.

  On the other hand, as one of the management of lawns in golf courses, etc., a piercing tool called “tine” is pierced almost perpendicularly to the turf surface and a vent hole is drilled (in this industry, this drilling work is “ Sometimes referred to as “aeration”), improving the air permeability of the lawn to improve the soil to improve the lawn growth. In addition, after the above “aeration”, sand called “joint soil” is sprayed on the surface of the lawn to block the perforated vents, or to make the ball rolling in the green uniform. It is also practiced to uniformly disperse the above-mentioned “joint soil” in the gaps to eliminate surface irregularities. When the above “aeration” is performed, the soil adheres to the lawn due to the removal of the drilling tool, and the sand adheres to the lawn by the spraying of the “mesh”. It remains attached for a predetermined period. In relation to the lawn mowing work, there is a case where the above-mentioned soil and sand are attached to the lawn. When lawn mowing is performed in such a state, the reel cutter K is significantly worn compared to a normal state (a state where soil and sand are not attached to the lawn).

Thus, in lawn mowing work, depending on the location of the lawn, there is a case where mowing with a short “clip pitch” is required and a case where it is not so. We often have different lawn mowers to deal with the above situation. Note that the “clip pitch” can be changed by changing the gear ratio of one of the meshing gears of the two power transmission paths to the reel cutter K and the drum wheel 3 when the transmission device D is a gear mechanism. In order to change the meshing gear to change the gear ratio, the lawn mower user (user) can remove the cover of the transmission device D and change the gear of a specific intermediate shaft. It was necessary, and it was difficult for the user to perform the above change work.
Japanese Patent Publication No. 5-39564

  An object of the present invention is to enable an operator to easily change the “clip pitch” according to the purpose of the lawn mowing work, and to enable lawn mowing work having a different “clip pitch” with a single lawn mower. .

  The invention according to claim 1 for solving the above-described problem branches the power of the engine mounted on the fuselage to the single reel cutter and the drum wheel through the first and second power transmission paths of the transmission device, respectively. In the lawn mower configured to transmit and mow the lawn, at least one of the first and second power transmission paths of the transmission device is incorporated with a speed change mechanism operable from the outside, and is rotated by the operation of the speed change mechanism. The clip pitch, which is the distance traveled by the machine F, is changed between the start of the lawn mowing by the cooperation of the reel blade of the reel cutter and the bed knife of the machine, And it is characterized by having comprised so that the cutting operation of the lawn from which a clip pitch differs can be performed with the same lawn mower.

  According to the first aspect of the present invention, since the speed change mechanism that can be operated from the outside is incorporated in at least one of the first and second power transmission paths of the transmission device, the clip is operated only by operating the speed change mechanism. You can easily change the pitch. For this reason, if there is no soil attached to the lawn and you want to mow it nicely, you can shorten the clip pitch by operating the speed change mechanism and perform the lawn mowing work, the soil is attached to the lawn, If it is predicted that the reel cutter will be heavily worn, the clip pitch may be set longer by operating the speed change mechanism and the lawn mowing operation may be performed. For this reason, the user can perform lawn mowing work with different clip pitches only by having one lawn mower.

  According to a second aspect of the present invention, in the first aspect of the present invention, the transmission device includes a gear mechanism, and the speed change mechanism incorporated in the first power transmission path includes two first speed changes with different numbers of teeth. A slide gear body in which a gear is integrally attached to the same shaft and is slidably fitted in the end of the cutter shaft of the reel cutter along the axial direction, and immediately before the cutter shaft of the reel cutter along the power transmission direction Two second transmission gears that are integrally attached to the intermediate shaft of the slide gear body and that can be engaged with each other by changing the combination with each first transmission gear of the slide gear body, and the slide gear body outside the transmission device. And a slide operation member for sliding in the axial direction.

  According to the invention of claim 2, two first transmission gears having different numbers of teeth of the slide gear body and the cutter shaft of the reel cutter along the power transmission direction only by operation of the slide operation member outside the transmission device. Since the number of revolutions of the reel cutter is changed by changing the combination of meshing with the two second transmission gears having different number of teeth attached to the intermediate shaft immediately before, the operation of changing the clip pitch is facilitated.

  According to a third aspect of the present invention, in the second aspect of the invention, the slide gear body includes two first transmission gears constituting the slide gear body and two second transmission gears that can mesh with the first transmission gear. And has a neutral position in which neither of the meshes engages.

  According to the invention of claim 3, for example, when the reel cutter is lapped, the slide gear body is disposed in a neutral position, and when the cutter shaft of the reel cutter is driven and rotated by a lapping machine, a transmission device is configured. All the remaining intermediate shafts are stopped, and the reel cutter can be wrapped while only the cutter shaft is driven and rotated. Accordingly, the gears constituting the transmission device are not worn unnecessarily, and the power of the lapping machine is consumed only for the rotation of the reel cutter and is not wasted.

  According to the clip-pitch variable lawn mower according to the present invention, the clip pitch can be set only by operating a speed change mechanism that is incorporated in at least one of the first and second power transmission paths of the transmission and can be operated from the outside. Because it is easy to change, if there is no soil attached to the lawn and you want to cut it nicely, you can shorten the clip pitch by operating the speed change mechanism, and the soil will adhere to the lawn. If it is predicted that the reel cutter will be heavily worn, and the cutting operation is performed while preventing the reel cutter from being heavily worn, the clip pitch should be set longer by operating the speed change mechanism and the lawn mowing work should be performed. . Therefore, the user can perform lawn mowing work with different clip pitches only by having one lawn mower.

Hereinafter, the present invention will be described in more detail with reference to a plurality of best embodiments of the present invention. FIG. 1 is a plan view in which a main part of a clip-pitch variable lawn mower according to the present invention is broken, FIG. 2 is a side view, and FIG. 3 is a schematic central longitudinal sectional view. 4 is a side view showing a gear mechanism of the transmission device D, and FIG. 5 is a schematic plan view showing a power transmission path Q ₁ from the engine E to the reel cutter K. The present invention is characterized in that the clip pitch can be changed by a transmission mechanism T that is incorporated in the transmission device D and can be operated from the outside. Therefore, the power transmission system is mainly used in the description of the embodiments. I will explain.

  1 to 5, a handle 2 is provided at the rear of the fuselage F via a handle arm 1, and the engine F is unevenly distributed in the width direction on the fuselage F. A drum wheel 3 is mounted, and a front roller 4 and a saturation roller 5 are arranged in this order along the front-rear direction at the front end of the body F, and a reel is provided between the switching roller 5 and the drum wheel 3. A cutter K is arranged. In FIG. 3, the front roller 4 is attached to the machine body F so as to be movable up and down, and the lawn cutting height is determined by the height of the front roller 4 with respect to the machine body F. The reel cutter K has a configuration in which a large number of reel blades 7 are spirally attached to the cutter frame 6, and is fixed to the reel blade 7 of the reel cutter K that rotates in a down-cut manner and the body F. The lawn is cut by the bed knife 8. Thatching roller 5 is a roller for scraping off the turf that has entered the lawn immediately before cutting. In addition, when performing lawn mowing work, the wheel 29 is removed from both ends of the drum shaft 25 and the drum wheel 3 is grounded as shown in FIG.

The power of the engine E is transmitted to a transmission shaft 14 arranged coaxially with the drive shaft 13 of the engine E through a clutch 12 that is intermittently operated by the operation of the clutch lever 11 in front of the handle 2. On the side opposite to the side where the engine E is unevenly arranged in the width direction of the machine body F, a transmission device D comprising a gear mechanism is mounted. In addition, the end opposite to the clutch 12 in the transmission shaft 14, with attached input gear G _0, the input gear G ₀ is arranged in case 15 of the transmission device D. That is, the transmission shaft 14 connected to the drive shaft 13 of the engine E via the clutch 12 is an “input shaft” when viewed from the transmission device D. The transmission device D has two different power transmission paths, namely, a first power transmission path Q ₁ for transmitting the power of the transmission shaft 14 that is an “input shaft” to the reel cutter K and a second power transmission path Q ₂ for transmission to the drum wheel 3. It has a power transmission path.

In FIG. 4, in the first power transmission path Q ₁ , the input gear G ₀ attached to one end of the transmission shaft 14 and the first gear G ₁ of the first intermediate shaft S ₁ are meshed, and further the first gear. G ₁ meshes with the second gear G ₂ of the second intermediate shaft S ₂ . The third and fourth gears G ₃ and G ₄ having different number of teeth are integrally attached to the third intermediate shaft S ₃ , and the second gear G ₂ is the third gear having the smaller number of teeth. G ₃ and meshes. As shown in FIG. 6, the portion of the cutter shaft 16 of the reel cutter K that enters the case 15 of the transmission device D is a spline portion 16a that has been subjected to spline processing. The slide gear body A having three modes that mesh with any one of the third and fourth gears G ₃ and G ₄ or that do not mesh at all is provided along the axial direction of the cutter shaft 16. It is slidably fitted.

That is, in the slide gear body A, the fifth gear G ₅ meshed with the third gear G ₃ and the sixth gear G ₆ meshed with the fourth gear G ₄ are arranged along the axial direction of the cutter shaft 16. It is the structure provided integrally at predetermined intervals. The distance between the fifth and sixth gears G ₅ and G _{6 is} the distance at which both the third and fourth gears G ₃ and G ₄ are arranged without being meshed at the same time. the arrangement, the mutual power transmission between the cutter shaft 16 and the third intermediate shaft S ₃ is blocked. By rotating the slide operation body B with an eccentric pin 21 of the slide operation body B (described later) being inserted and locked on the outer end side of the slide gear body A, the slide gear body A is moved to the axis of the cutter shaft 16. A locking body 17 having an annular locking groove 17a that is slid in the direction is integrally provided. Further, as shown in FIGS. 7 and 8, a cylindrical guide body 18 protrudes and is integrally provided at a portion corresponding to the locking body 17 of the slide gear body A in the case 15 of the transmission device D. . As shown in FIGS. 6 to 8, the slide operation body B that slides the slide gear body A in the axial direction of the cutter shaft 16 is a cylindrical operation body that is inserted into the guide hole 18 a of the cylindrical guide body 18. The operation body main body 19 is attached to the main body 19, an eccentric pin 21 provided eccentric to the operation body main body 19 on the insertion side end face of the operation body main body 19, and the cylindrical guide body 18. In the inserted state, a handle portion 22 provided along the radial direction is provided at a portion protruding from the cylindrical guide body 18. Therefore, the operation body main body 19 of the slide operation body B is inserted into the cylindrical guide body 18, and the eccentric pin 21 at the tip is inserted and locked in the annular locking groove 17 a of the slide gear body A. When the operating body B is rotated, the slide gear body A is slid in the axial direction of the cutter shaft 16. Note that the position of the eccentric pin 21 and the handle portion 22 of the slide operation body B are shifted by 90 ° from the center of the cylindrical operation body main body portion 19.

Then, as shown in FIG. 9, when sliding the slide gear body A most end side with respect to the cutter axis 16, the third the fourth gear G ₄ of the intermediate shaft S _3, the first slide gear body A The six gears G ₆ mesh with each other, and the rotation of the cutter shaft 16 is increased to a “normal specification” with a short clip pitch P. As shown in FIG. 10, the above state (accelerated state) when the half rotation of the sliding operating body B from the slide gear body a is being slid in the most central side with respect to the cutter axis 16, the third gear G ₃ of the third intermediate shaft S _3, the first slide gear body a The cutter shaft 16 is decelerated by meshing with the five gears G ₅ , and becomes a “deceleration specification” with a long clip pitch P. Further, when the slide operation body B is rotated by 90 ° from the “normal specification” shown in FIG. 9, as shown in FIG. 11, the third and fourth gears G _{3 of} the third intermediate shaft S ₃ are shown. , G ₄ are arranged in a neutral state between the fifth and sixth gears G ₅ , G ₆ of the slide gear body A and do not mesh with any of the gears G ₅ , G _6. Become.

As described above, the transmission mechanism T that can be operated from the outside is incorporated in the first power transmission path Q ₁ of the transmission device D, and the user of the lawn mower can easily perform the external operation without disassembling the transmission device D. Only by the operation, the clip pitch can be changed by operating the speed change mechanism T, and either “normal specification” or “deceleration specification” can be selected. The transmission mechanism T of this embodiment, a sliding gear body A fitted slidably spline portion 16a of the one end of the cutter shaft 16, the third intermediate shaft S ₃ immediately before the cutter shaft 16 along the power transmission direction Of the third and fourth gears G ₃ and G ₄ integrally attached to the two, and the two gears G ₅ and G ₆ constituting the slide gear body A and the gears G ₃ and G ₄ . It is comprised with the slide operation body B for changing a combination. The two gears G ₅ and G ₆ constituting the slide gear body A and the gears G ₃ and G ₄ integrally attached to the third intermediate shaft S ₃ function as transmission gears.

  As shown in FIGS. 7 and 8, the end face on the exposed side of the cylindrical guide 18 provided integrally with the case 15 is shifted in phase by 90 ° corresponding to the above three states. A handle locking groove 18b is provided at the above position. Further, the upper end surface of the operation body main body 19 of the slide operation body B is pressed against the case 15 by a plate spring 24 fixed by a fixing bolt 23. For this reason, when the handle portion 22 of the slide operating body B is withdrawn from the handle locking groove 18b against the restoring force of the leaf spring 24, the slide operating body B becomes rotatable and the handle locking When the handle portion 22 of the slide operating body B is locked in the groove 18b, the locked state is maintained by the action of the leaf spring 24.

On the other hand, the second power transmission path Q ₂ is a path for transmitting the power of the transmission shaft 14 to the drum wheel 3 and will be briefly described. In the second power transmission path Q ₂ , the fourth and fifth intermediate shafts S ₄ and S ₅ are arranged between the first intermediate shaft S ₁ and the drum shaft 25 of the drum wheel 3, and the fourth intermediate shaft the shaft S _4, together with the seventh and gears G ₇ of the 8, G ₈ significantly different two of the number of teeth is integrally attached to, the fifth intermediate shaft S _5, large well number of teeth Two different ninth and tenth gears G ₉ and G ₁₀ are integrally attached. The first gear G ₁ of the first intermediate shaft S _1, together with the meshes with the seventh gear G ₇ in the larger number of teeth of the fourth intermediate shaft S _4, the number of teeth of the fourth intermediate shaft S ₄ The smaller eighth gear G ₈ meshes with the ninth gear G ₉ having the larger number of teeth of the fifth intermediate shaft S ₅ , so that the rotation of the fifth intermediate shaft S ₅ is decelerated. Exactly in the same manner, the tenth gear G ₁₀ having the small number of teeth of the fifth intermediate shaft S ₅ meshes with the eleventh gear G ₁₁ (having more teeth than the tenth gear G ₁₀ ) attached to the drum shaft 25. because you are, the drum shaft 25 is decelerated with respect to the fifth intermediate shaft S _5.

Therefore, rotation of the input gear G ₀ which is attached to one end of the transmission shaft 14, than the input gear G ₀ is reduced by the meshing of the first gear G ₁ much larger number of teeth, the first power transmission path In Q ₁ , the rotation of the first intermediate shaft S ₁ is slightly increased and transmitted to the cutter shaft 16 of the reel cutter K, and the rotation of the first intermediate shaft S ₁ is greatly increased in the first power transmission path Q ₁ . It is decelerated and transmitted to the drum shaft 25 of the drum wheel 3. The drum wheel 3 serves as a driving wheel and the machine body F travels, and the reel cutter K rotates in the downcut direction, so that the lawn is cut at a cutting height determined by the height of the front roller 4 with respect to the machine body F. . In FIG. 3, reference numeral 26 denotes a transport guide cover for transporting and guiding the cut grass along the rotation direction of the reel cutter K. In FIGS. 1 and 2, 27 is the transport guide cover 26. Is a grass collection box that collects the lawn that has been guided by and scattered in front of the machine body F, and 28 represents a transmission device that transmits the rotation of the reel cutter K to the hatching roller.

In this way, a lawn mower user simply operates the slide operation body B of the speed change mechanism T according to the lawn condition, the purpose of lawn mowing, etc. The desired lawn mowing work can be performed by freely selecting one of the long “deceleration specifications”. Further, when the reel cutter K is lapped, the transmission mechanism T is set to “neutral specification”, whereby power transmission can be interrupted between the cutter shaft 16 and the third intermediate shaft S _3, and the power of the lapping machine is reduced to the reel cutter. Since it is consumed only for driving rotation of K, the power efficiency is enhanced, and the intermediate shaft and gears in the transmission device D are not rotated unnecessarily, and there is an advantage that these unnecessary wear can be prevented. A portion of the cutter shaft 16 that protrudes from the case 15 of the transmission device D is a connecting portion 16b that is connected to a rotating portion of a driving source that drives and rotates the reel cutter K during the lapping.

In addition, the slide gear body A has a configuration in which an engaging body 17 having an annular engaging groove 17a is integrally provided at an outer end portion thereof. In order to ensure the "neutral specification", The distance between the fifth and sixth gears G ₅ and G ₆ constituting the slide gear body A is the same as that of the third and fourth gears G ₃ and G ₄ integrally attached to the third intermediate shaft S ₃ . It is necessary to make it wider than the width, and a large gap is formed between the fifth and sixth gears G ₅ and G ₆ along the direction of the cutter shaft 16. For this reason, as shown in FIG. 12, an annular locking groove 31 is formed between the fifth and sixth gears G ₅ and G ₆ in the slide gear body A, and the sliding groove 31 is slid in the locking groove 31. It is also possible to insert and lock the eccentric pin 21 of the operating body B. With this configuration, the protruding thickness of the cutter shaft 16 in the case 15 can be reduced, and the entire width of the case 15 can be reduced when viewed from the lawn mower.

The first gear G ₁ attached to the first intermediate shaft S ₁ of the transmission device D can be slid in the axial direction of the first intermediate shaft S ₁ by the rotation operation of the slide operation body 28 (see FIG. 2). It has become. At the time of lawn mowing work, as described above, the first gear G ₁ meshes with the second and seventh gears G ₂ and G _7, and both the reel cutter K and the drum wheel 3 are driven to rotate, and the mowing work site The first gear G ₁ meshes only with the seventh gear G ₇ and does not mesh with the second gear G _2, and the wheel 29 mounted on the drum shaft 25 (see FIG. 1). , The body F travels with the reel cutter K stopped. Furthermore, the first gear G ₁ is not meshed with both the second and seventh gears G ₂ and G ₇ in order to push the lawn mower manually in a hangar or the like. You can choose.

Further, the above embodiment, the transmission device D consists of a gear mechanism, the cutter shaft 16 of the reel cutter K, incorporates a transmission mechanism T between the intermediate shaft S ₃ immediately before along the power transmission direction there, with allows easy operation of the speed change mechanism T from the outside, for power transmission between the intermediate shaft S ₃ immediately before the reel cutter K along the power transmission direction is configured to be blocked, the reel cutters When K is wrapped, the above-described specific effects are exhibited. However, the present invention is not limited to a transmission device constituted by a gear mechanism, and can also be implemented for a chain gear mechanism that is a combination of a chain gear and a chain, or a belt transmission mechanism that is a combination of a pulley and a belt.

Further, in the above embodiment, the transmission mechanism T is incorporated in the first power transmission path Q _{1 in} which the power of the engine E is transmitted to the reel cutter K in the transmission device D. However, the power of the engine E is transmitted to the transmission device. It is theoretically possible to incorporate a speed change mechanism in the second power transmission path Q ₂ that is transmitted to the drum wheel 3 in D.

It is the top view which fractured | ruptured the principal part of the clip pitch variable lawn mower which concerns on this invention. It is a side view similarly. It is a typical center longitudinal cross-sectional view similarly. 3 is a side view showing a gear mechanism of a transmission device D. FIG. ₃ is a schematic plan view showing a power transmission path Q ₁ from the engine E to the reel cutter K. FIG. 4 is a cross-sectional view of a portion where an end of a cutter shaft 16 of a reel cutter K enters a transmission device D. FIG. 3 is an exploded perspective view of a slide operation body B. FIG. 4 is a perspective view of a portion of a slide operation body B of the transmission device D. FIG. (A) and (B) are front views of the slide gear body A and the slide operation body B constituting the transmission mechanism T in the “normal specification”, respectively. (A) and (B) are front views of the slide gear body A and the slide operation body B that constitute the transmission mechanism T in the “deceleration specification”, respectively. (A) and (B) are front views of the slide gear body A and the slide operation body B that constitute the transmission mechanism T in the “neutral specification”, respectively. FIG. 6 is a cross-sectional view of another structure of a portion where the end of the cutter shaft 16 of the reel cutter K enters the transmission device D.

Explanation of symbols

A: Slide gear body
B: Slide operation body (slide operation member)
D: Transmission device
E: Engine
F: Airframe
G _5, G _6: gear (first speed change gear)
G ₃ , G ₄ : Gear (second gear)
K: Reel cutter
Q ₁ : First power transmission path
Q ₂ : Second power transmission path
P: Clip pitch
R: Reel cutter rotation speed
T: Transmission mechanism
V: Aircraft travel speed
3: Drum wheel
16: Cutter shaft
16a: Spline part of cutter shaft

Claims (3)

In a lawn mower configured to mow the lawn by branching and transmitting the power of the engine mounted on the airframe to the single reel cutter and drum wheel via the first and second power transmission paths of the transmission device,
A transmission mechanism that can be operated from the outside is incorporated in at least one of the first and second power transmission paths of the transmission device, and the grass blade is supported by the cooperation of the reel blade of the rotating reel cutter and the bed knife of the airframe. The clip pitch, which is the distance traveled by the machine body F, is changed between the start of trimming and the start of trimming with the next reel blade, so that lawn mowers with different clip pitch can be trimmed with the same lawn mower. A clip-pitch-variable lawn mower characterized by the construction of The transmission device is constituted by a gear mechanism, and the transmission mechanism incorporated in the first power transmission path is configured such that two first transmission gears having different numbers of teeth are integrally attached to the same shaft, and the cutter shaft of the reel cutter A slide gear body that is slidably fitted along the axial direction at the end of each of the slide gear bodies, and an intermediate shaft immediately before the cutter shaft of the reel cutter along the power transmission direction. Two second transmission gears having different numbers of teeth that can be engaged with each other by changing the combination with the first transmission gear, and a slide operation member for sliding the slide gear body in the axial direction outside the transmission device. The clip-pitch variable lawn mower according to claim 1. The slide gear body has a neutral position where the two first transmission gears constituting the slide gear body and the two second transmission gears engageable with the first transmission gear are not engaged with each other. The clip-pitch variable lawn mower according to claim 2, wherein the clip-pitch variable lawn mower is provided.

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