Mower

Abstract

To provide a mower capable of suppressing deterioration in weight balance even when a rotational cover is attached to a rear part of a working part.SOLUTION: A mower comprises: a working part for performing mowing work; and a mounting part coupled to a coupling mechanism of a traveling car body, where the working part includes a mowing blade, a rotary shaft to which the mowing blade is attached, a cover for covering at least an upper side of the mowing blade and the rotary shaft, and a mowing blade drive part for transmitting power from the traveling car body to the rotary shaft, where the rotary shaft extends in a horizontal direction orthogonal to a traveling direction of the traveling vehicle body. The mower includes a rotational cover pivotally supported by a rotary shaft on a rear side of the cover and rotationally turning up and down, and an input shaft of the mowing blade drive part is located on a rear side of the rotational shaft.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a grass cutter. [Background technology]

[0002] Conventionally, there has been known a grass cutter that is connected to the rear of a running vehicle such as a tractor, has a rotating shaft arranged in a horizontal direction perpendicular to the direction of travel, has a grass cutting blade attached to the rotating shaft, and rotates the rotating shaft together with the grass cutting blade to cut weeds and the like. In conventional grass cutters, the grass cutting blade and its rotating shaft are covered from above, sides and rear, and the cut grass remains inside these covers and is cut by the grass cutting blade and discharged in a shortened state through the gap between the rear cover and the ground to the outside.

[0003] In this conventional lawnmower, as the amount of grass and other materials trapped inside the cover increases, the load on the rotating shaft to which the grass-cutting blade is attached increases, slowing down the progress of the lawnmower, or in other words, the speed of the traveling vehicle, such as a tractor, that tows the lawnmower, and causing a decrease in working speed. For this reason, there is known a grass cutter in which a rear cover (opening / closing cover) is installed so that it can rotate up and down to open the rear of the grass cutting blade and the rotating shaft to which the grass cutting blade is attached, and by detecting the load on the rotating shaft to which the grass cutting blade is attached and controlling the rotation position of the opening / closing cover, the rear is opened and the load can be reduced when the load increases (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-55401 Summary of the Invention [Problem to be solved by the invention]

[0005] The grass cutter described in Patent Document 1 is equipped with hinges for enabling the opening and closing cover to rotate, and a hydraulic cylinder for adjusting the rotation position, which increases the weight of the rear part of the working unit. This causes an increase in weight at a position away from the rear of the tractor or other running vehicle, which increases the moment tending to tilt the tractor or other running vehicle backward, resulting in a problem of poor weight balance for the entire running vehicle of the tractor or other running vehicle equipped with a lawnmower.

[0006] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, an object of the present invention is to provide a grass cutter that solves the above problems and prevents deterioration of the weight balance even when a rotatable cover is attached to the rear of the working unit. [Means for solving the problem]

[0007] In order to solve such problems, the present invention has the following configuration. A working section that performs grass cutting work; A mounting portion that is connected to a connecting mechanism of a traveling vehicle body, The working unit includes a grass cutting blade, a rotating shaft to which the grass cutting blade is attached, a cover that covers at least the upper part of the grass cutting blade and the rotating shaft, and a blade drive unit that transmits power from the traveling body to the rotating shaft, and the rotating shaft extends in a horizontal direction perpendicular to the traveling direction of the traveling body, A rotating cover is provided which is pivotally supported on a rotating shaft at the rear of the cover and can rotate up and down, The input shaft of the blade drive unit is located rearward of the rotation shaft. A grass cutter characterized by: Effect of the Invention

[0008] The rotating cover is pivoted to a pivot shaft at the rear of the cover and can rotate up and down, and the input shaft of the blade drive unit, which transmits power from the running body to the rotating shaft, is positioned rearward of the pivot shaft, allowing the working unit to be brought closer to the running body, providing a lawnmower that prevents deterioration of the weight balance. [Brief description of the drawings]

[0009] [Figure 1] 1A and 1B are diagrams showing the grass cutter 1 according to an embodiment of the present invention in a stored state and in a closed state with a rear cover 144. FIG. [Diagram 2] 1A and 1B are diagrams showing the grass cutter 1 according to an embodiment of the present invention in a stored state and with a rear cover 144 in an open state. [Diagram 3] FIG. 1(b) is a partially enlarged view of FIG. 2(b). [Figure 4] 1A and 1B are diagrams showing the grass mower 1 according to an embodiment of the present invention in a maximum offset state and a rear cover 144 in a closed state. [Diagram 5] 1A and 1B are diagrams showing the grass mower 1 according to an embodiment of the present invention in the maximum offset state and in the shielding state of the rear cover 144 when working on a slope facing downward, and when working on a slope facing upward. [Figure 6] 11A and 11B are diagrams showing a modified example of the grass cutter 1 of the present invention in a stored state and in a closed state with a rear cover 144. [Figure 7] 11A and 11B are views showing a modified example of the grass cutter 1 of the present invention in a stored state and a rear cover 144 in an open state. [Figure 8] FIG. 6(b) is a partially enlarged view of FIG. 7(b). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Embodiment] Hereinafter, a grass cutter 1 according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different drawings indicate parts having the same functions, and duplicated descriptions in each drawing will be omitted as appropriate. For ease of explanation, terms indicating directions such as up, down, front, rear, right, and left are used, but the direction in which gravity acts is downward, and the opposite is upward. The direction in which the traveling vehicle body 2 moves is forward, and the opposite is backward. Furthermore, when facing forward, the right side is the right side, and the left side is the left side.

[0011] [Overall structure] FIG. 1 shows a grass cutter 1 according to an embodiment of the present invention in a stored state with a rear cover 144 closed, where (a) is a view from above, (b) is a view from the left, and (c) is a view from behind. FIG. 2 is a diagram of the grass cutter 1 according to an embodiment of the present invention in a stored state with the rear cover 144 open, where (a) is a view from above, (b) is a view from the left, and (c) is a view from the rear. 3A is a partially enlarged view of FIG. 1B, and FIG. 3B is a partially enlarged view of FIG. 2B. FIG. 4 is a diagram showing the grass cutter 1 according to an embodiment of the present invention in the maximum offset state and in the closed state of the rear cover 144, where (a) is a view from above, (b) is a view from the left, and (c) is a view from behind.

[0012] As shown in FIGS. 1 to 4, the grass cutter 1 in this embodiment includes a mounting section 11, an offset mechanism section 12, a power transmission section 13, a working section 14, and a rotation mechanism section 15. The grass cutter 1 is connected to a traveling body 2 such as a tractor by a mounting part 11. The mounting part 11 and the working part 14 are connected via an offset mechanism part 12, a power transmission part 13, and a rotation mechanism part 15. As a result, the grass cutter 1 moves forward as the traveling body 2 moves, and the working part 14 performs grass cutting work.

[0013] As will be described later, the working unit 14 can be moved by the operation of the offset mechanism 12 from a rear position of the traveling body 2 as shown in Fig. 1 to a position offset to the right side of the traveling body 2 as shown in Fig. 4. For this reason, the offset mechanism 12, the power transmission unit 13 and the rotation mechanism 15 are provided above and to the left of a front cover 142 of the working unit 14, which will be described later. In this embodiment, grass cutting work can be performed at any position between the rear position of the traveling body 2 as shown in Fig. 1 and the position offset to the right side of the traveling body 2 as shown in Fig. 4. As shown in Fig. 1, the state in which the working unit 14 is located at the rear of the traveling body 2 is referred to as the stored state, and the state in which the working unit 14 is located on the outside of the traveling body 2 is referred to as the offset state. As shown in Fig. 4, the state in which the working unit 14 is located at the outermost side in the offset state is referred to as the maximum offset state. Furthermore, mowing work is not limited to being performed at any position between the stored state shown in FIG. 1 and the maximum offset state shown in FIG. 4. For example, mowing work may be restricted to being unable to be performed in the stored state, or mowing work may be performed only at specific points between the stored state and the maximum offset state, or it may be possible for mowing work to be performed only in a specific range or specific position.

[0014] [Installation part] The mounting portion 11 is connected to a three-point link mechanism 22 (only a lower link is shown here) provided between two rear tires 21 of the traveling vehicle body 2. The three-point link mechanism 22 is usually composed of a top link, a lift rod, a lower link, etc. The three-point link mechanism 22 is a known mechanism, so a detailed description thereof will be omitted.

[0015] The mounting section 11 includes a hitch frame 111 extending in the left-right direction, which is the width direction of the traveling body 2. The hitch frame 111 has a top link connecting portion connected to the top link and a lower link connecting portion connected to the lower link, and is configured to be connectable to a three-point link mechanism 22 (connecting mechanism) provided at the rear of the traveling body 2. A gear box 112 is provided at the lower center of the hitch frame 111, and this gear box 112 is provided with a grass cutter input shaft 113 that receives power from the traveling body 2. Power is transmitted to the grass cutter input shaft 113 from the PTO shaft 23 provided on the traveling body 2 via a universal joint (not shown).

[0016] [Offset mechanism] The offset mechanism 12 is a mechanism for moving the working unit 14 to an offset position (offset position). Specifically, the offset mechanism 12 can move the working unit 14 from a rear position of the traveling body 2 as shown in Fig. 1 to an offset position to the side (outer right in this embodiment) with respect to the traveling direction of the traveling body 2 as shown in Fig. 4. The offset mechanism 12 has an offset frame 121, a link rod 122, a support frame 123, and an expandable member 124. In this embodiment, the support frame 123 supports the working unit 14, and is configured to offset to the right together with the working unit 14.

[0017] One end (front side) of the offset frame 121 and the link rod 122 is rotatably connected to the hitch frame 111, and the other end (rear side) of the offset frame 121 and the link rod 122 is rotatably connected to the support frame 123. With the above configuration, the hitch frame 111, the offset frame 121, the link rod 122, and the support frame 123 form a parallelogram link mechanism (parallel link mechanism) with the respective rotation centers as vertices. With this link mechanism, the offset mechanism unit 12 can offset move the working unit 14 while maintaining the angle of the working unit 14 with respect to the traveling direction of the traveling body 2.

[0018] The expandable member 124 is a power source (actuator) of the offset mechanism unit 12 and is composed of, for example, a gas cylinder, a hydraulic cylinder, an electric cylinder, etc. One end of the expandable member 124 is connected to the hitch frame 111, and the other end is connected to the rear of the offset frame 121. The expansion and contraction of the expandable member 124 drives the offset mechanism unit 12, making it possible to control the offset amount (amount of movement in the offset direction) of the working unit 14. In this embodiment, the telescopic member 124 is configured so that when it is contracted, the working unit 14 is at a rear position of the running body 2, and when it is extended, the working unit 14 is at an offset position; however, the telescopic member 124 may be configured conversely so that when it is extended, the working unit 14 is at a rear position of the running body 2, and when it is contracted, the working unit 14 is at an offset position. In this embodiment, the working unit 14 is structured so that it can be offset to the outside right of the traveling body 2, but conversely, it may be structured so that it can be offset to the outside left, or even so, it may be structured so that it can be offset to both the outside left and right.

[0019] [Power transmission section] The power transmission unit 13 is a mechanism for transmitting the power from the traveling vehicle body 2 received by the mower input shaft 113 of the mounting unit 11 to the working unit 14. The mower 1 of this embodiment employs a chain drive mechanism. Specifically, the power transmission unit 13 has at least a drive sprocket 131, a driven sprocket 132, and a roller chain 133. The roller chain 133 is configured to be wound around the drive sprocket 131 and the driven sprocket 132. The working unit 14 receives power from the driven sprocket 132 via a first bevel gear 134 and performs grass cutting work. The power transmission unit 13 is disposed above the offset mechanism unit 12 . Note that a belt drive mechanism may be used instead of the above-mentioned chain drive mechanism for the power transmission unit 13. Also, a universal joint may be used as the power transmission unit 13. Furthermore, instead of being provided with the power transmission unit 13, the grass cutter 1 may be provided with a drive source such as an electric motor or hydraulic motor, and the power of the drive source may be transmitted directly to the working unit 14, or the power of the drive source may be transmitted to the working unit 14 via another power transmission means.

[0020] [Working section] The working unit 14 is connected to the offset mechanism 12. As described above, the working unit 14 moves in an offset manner while maintaining a constant angle with respect to the traveling direction of the traveling body 2 by expanding and contracting the expandable member 124. The support frame 123 is coaxially connected to the offset frame 121 so as to be freely rotatable, and is connected to the working unit 14 via the pivot mechanism 15.

[0021] The working unit 14 has a working rotor 141 , a front cover 142 (cover), a side plate 143 , a rear cover 144 (rotating cover), a working unit input shaft 145 , a blade driving unit 147 , and a gauge roller 148 . The work rotor 141 includes a rotating shaft 141a (a rotating shaft to which a grass cutting blade is attached) disposed between side plates 143 at both ends, and a plurality of grass cutting blades 141c radially provided on the rotating shaft 141a. The rotating shaft 141a extends in a horizontal direction perpendicular to the traveling direction of the traveling body 2. A plurality of brackets 141b each having a pair of support portions are provided on the circumferential surface of the rotating shaft 141a. A grass cutting blade 141c is attached to the brackets 141b. Note that instead of providing a plurality of brackets 141b, each having a pair of support portions, on the circumferential surface of the rotating shaft 141a, a plurality of pairs of protruding portions may be provided on the circumferential surface of the rotating shaft 141a. The grass cutting blade 141c is not limited to two overlapping bent blades as shown in Fig. 2(c), but may have any other shape or structure. Furthermore, the grass cutting blade 141c may be attached via a separate member such as a shackle or ring, rather than directly to the bracket 141b.

[0022] The working unit 14 rotates the rotary shaft 141a and cuts weeds and the like with the grass cutting blade 141c. In this embodiment, as shown by the arrows in Figures 3(a) and (b), the rotating shaft 141a rotates clockwise when viewed from the left. As a result, the grass-cutting blade 141c cuts the weeds, etc., by smashing them from rear to front below the rotating shaft 141a. The cut weeds, etc., pass through the front cover 142, the side plate 143, and the rear cover 144, and are finally discharged rearward through the gap between the rear cover 144 and the ground.

[0023] The front cover 142 is a cover member disposed to cover the front and the top of the work rotor 141. The front cover 142 has the effect of preventing the scattering of weeds cut by the grass cutting blade 141c, soil adhering to the weeds, and pebbles that have fallen to the work surface (ground surface), and also returns the cut weeds to the grass cutting blade 141c to crush them finely.

[0024] The side plate 143 rotatably supports the rotary shaft 141a via a ball bearing or the like, and also supports the front cover 142. In this embodiment, a cutting blade drive unit 147 is provided on the side plate 143 at the left end.

[0025] The rear cover 144 is pivotally supported up and down on a rear cover shaft 1441 (rotating shaft) provided on the rear side of the front cover 142 (for example, the rear end in this embodiment), making it possible to increase or decrease the gap between the rear end of the rear cover 144 and the ground (to be able to open and close). The rear cover 144 has a rear cover main body 144a pivotally supported on the front cover 142 so as to be rotatable up and down, and a substantially triangular or fan-shaped fixing piece 144b provided on both the left and right ends of the rear cover main body 144a. Each of these fixing pieces 144b has one bolt hole (not shown), and each of the side plates 143 has a plurality of bolt holes (not shown). By rotating the rear cover 144 to match the bolt hole of the fixing piece 144b with one selected from the plurality of bolt holes of the side plates 143 and fixing them with a bolt and nut 144c, the rear cover main body 144a can be fixed at a predetermined angle to the front cover 142. In order to improve the workability when adjusting the degree of shielding of the rear cover 144, the bolt hole of the fixing piece 144b is formed at a position that does not overlap with a cover body (chain cover) that covers the cutting blade drive unit 147 in a side view. In order to reduce the size of the rear cover 144 and increase the degree of freedom in layout, the rear cover shaft 1441 is preferably provided behind the rotation shaft 141a. The fixing means capable of fixing the rear cover 144 at a predetermined rotation angle may have any other configuration. Also, the rear cover shaft 1441 may be provided on the two side plates 143 instead of on the rear end of the front cover 142. For reinforcement, the rear end of the rear cover body 144a may be bent outward or inward, or a reinforcing plate or frame may be provided at the rear end.

[0026] In the grass cutter 1 of this embodiment, by adjusting the angle of the rear cover main body 144a relative to the front cover 142 using the fixing piece 144b, the degree of shielding (degree of opening) of the rear cover 144 can be adjusted between a shielded state (see Figures 1 and 3(a)) in which the gap between the rear end of the rear cover 144 and the ground is smallest, and an open state (see Figures 2 and 3(b)) in which the gap between the rear end of the rear cover 144 and the ground is largest. In order to prevent flying stones, it is preferable that the rear end of the rear cover 144 be positioned below the highest position of the front cover 142 (for example, above the highest position of the rotation trajectory of the grass cutting blade 141c (above the rotation shaft 141a)) when in the open state. In addition, the degree of shielding (degree of openness) may be configured in any manner, such as being adjustable in multiple stages as in this embodiment, or being continuously adjustable, or may be configured to be switchable between only two states: a shielded state and an open state. The degree of shielding (degree of opening) may be adjusted manually or by using a driving means such as a cylinder or a motor. Furthermore, the rotation position of the rear cover 144 may be controlled by detecting the load on the rotating shaft 141a.

[0027] When the rear cover 144 is in the shielding state, much of the cut weeds and other grass remains inside the working part 14 and is chopped by the grass cutting blade 141c, and the chopped weeds and other grass are discharged rearward through a small gap between the bottom end of the rear cover 144 and the ground. When the rear cover 144 is in an open state, most of the cut weeds and the like are discharged from the rear of the working unit 14, which is widely opened, without being chopped by the grass cutting blade 141c.

[0028] When the rear cover 144 is in the closed state, the cut weeds and the like are shredded and discharged, but the load on the rotating shaft 141a increases, slowing down the progress of the lawnmower 1, in other words, the speed of the traveling vehicle 2, such as a tractor, that tows the lawnmower 1, and causing a decrease in the working speed. When the rear cover 144 is in an open state, the load on the rotating shaft 141a is not large, but the cut weeds and the like are not chopped and are discharged in their long form. In the grass cutter 1 of this embodiment, the rear cover 144 can be appropriately adjusted to a desired position between the closed state and the open state, taking into consideration the state in which weeds are being chopped and the working speed. That is, by adjusting the degree of shielding (degree of opening) of rear cover 144, it is possible to adjust the work speed (work load) and the length of the weeds etc. to be discharged. Regardless of the state of shredding of the weeds, etc. or the working speed, the degree of shielding by the rear cover 144 may be adjusted according to the purpose of the discharged weeds, etc., to adjust the length of the discharged weeds, etc. In addition, in this embodiment, rear cover 144 is configured so that the entire rear cover 144 rotates in the vertical direction, but this is not limited to the above, and the rear cover 144 may be configured so that a part of it rotates in the vertical direction, or the rear cover may have an opening and an opening cover that rotates in the vertical direction is provided in this opening.

[0029] The power transmission means in the working unit 14 will now be described. The power transmitted to the driven sprocket 132 of the power transmission unit 13 is transmitted to the working unit input shaft 145, which is the power input part of the working unit 14, via the first bevel gear 134, which is the power output part of the power transmission unit 13 and is provided at the lower end of the shaft of the driven sprocket 132. In this embodiment, the working unit input shaft 145 is provided on the right side (inside) of the blade drive unit 147 which is provided on the left side (outside) of the left side panel 143, but it may also be configured to be provided on the left side (outside) of the blade drive unit 147.

[0030] The power transmitted to the working unit input shaft 145 is transmitted to a blade driving portion 147 via a second bevel gear 146 provided at the rear end of the working unit input shaft 145 . The power transmitted to the blade driving portion 147 is then transmitted to the rotating shaft 141 a of the work rotor 141 . That is, the power transmitted from the power transmission unit 13 to the working unit input shaft 145 is transmitted by the blade driving unit 147, and finally directly to the rotation shaft 141a. A case housing a first bevel gear 134 provided at the lower end of the shaft of the driven sprocket 132 and a case housing a second bevel gear 146 provided at the rear end of the working unit input shaft 145 are capable of relative rotation around the axis of the working unit input shaft 145.

[0031] As shown in Figures 2(b) and 3(b), the blade driving unit 147 of this embodiment includes a driving pulley 147a, a driven pulley 147b, a belt 147c, and a tensioner 147d. The belt 147c is wound around the driving pulley 147a and the driven pulley 147b. The tensioner 147d is disposed inside the belt 147c wound around the driving pulley 147a and the driven pulley 147b, and applies tension to the belt 147c from the inside to the outside of the belt 147c.

[0032] In the blade drive unit 147, the power transmitted from the working unit input shaft 145 is transmitted to a drive pulley shaft 147a1 (input shaft of the blade drive unit), then transmitted from the drive pulley 147a to a driven pulley 147b via a belt 147c, and finally transmitted from a driven pulley shaft 147b1 (output shaft of the blade drive unit) to a rotating shaft 141a, thereby driving the working rotor 141. The driven pulley shaft 147b1 and the rotating shaft 141a are concentric. In this embodiment, a belt drive is used for the blade drive unit 147, but the present invention is not limited to this, and any other power transmission means such as a chain drive or a gear drive may be used.

[0033] The gauge roller 148 has a pair of left and right arms 148a supported so as to swing on swing fulcrums 148c provided on each of the two side plates 143, and a roller body 148b supported by the arms 148a. The height of the roller body 148b and the rotating shaft 141a can be changed by changing and fixing the swing position of the arm 148a, thereby adjusting the cutting height of the grass cutting blade 141c. The gauge roller 148 is a driven roller that rotates following the movement of the working unit 14, and in this embodiment, rotates counterclockwise when viewed from the left. The gauge roller 148 in this embodiment is provided with a scraper member for removing grass and the like adhering to the roller body 148b. The scraper member is bridged between the pair of arms 148a at the rear end side of the arms 148a, and is disposed so as to face the rear side of the gauge roller 148.

[0034] [Rotation mechanism] FIG. 5 is a diagram showing the grass mower 1 according to the embodiment of the present invention in the maximum offset state and in the shielding state of the rear cover 144, in which (a) it is working downward on a slope and (b) it is working upward on a slope. The turning mechanism 15 is a mechanism for turning the working unit 14 in the up-down direction around an axis extending in the front-rear direction, which is the traveling direction of the traveling vehicle body 2. The turning mechanism 15 is composed of a turning shaft, a turning arm, a telescopic cylinder, etc. The turning shaft of the turning mechanism 15 is concentric with the working unit input shaft 145 and is located in front of the working unit input shaft 145. Note that the turning mechanism 15 is a known mechanism, so a detailed description will be omitted. As shown in Fig. 5(a), in the grass cutter 1, the working unit 14 is in the maximum offset state and is rotated (clockwise as viewed from behind) by the rotation mechanism 15 so that the right end portion faces downward. The state shown in Fig. 5(a) is a state in which the working unit 14 is performing grass cutting work on an inclined surface (slope, etc.) located below the traveling surface of the traveling body 2. 5(b), the working unit 14 of the grass cutter 1 is in the maximum offset state and is rotated (counterclockwise as viewed from behind) by the rotation mechanism 15 so that the right end portion faces upward. The state shown in FIG. 5(b) is a state in which the working unit 14 is performing grass cutting work on an inclined surface (slope, etc.) located above the traveling surface of the traveling body 2. The structure of the rotation mechanism 15 is such that the working unit 14 can be rotated up and down not only in the maximum offset state, but also in any position between the stored state and the maximum offset state. In addition, in this embodiment, the right end of the working unit 14 is configured to face downward when the telescopic cylinder etc. is retracted and to face upward when the telescopic cylinder etc. is extended. However, the right end of the working unit 14 may be configured to face downward when the telescopic cylinder etc. is extended and to face upward when the telescopic cylinder etc. is retracted. Furthermore, although not shown, the degree of shielding (degree of opening) of the rear cover 144 can be adjusted even when the working unit 14 is rotated in the vertical direction.

[0035] [Working unit placement] Since the rear cover 144 is provided at the rear of the working unit 14, the weight of the rear of the working unit 14 increases. As a result, the weight balance of the traveling body 2 to which the grass cutter 1 is attached is biased to the rear, so in this embodiment, in order to position the working unit 14 close to the traveling body 2, the following positioning is adopted so that the working unit 14 can be positioned as far forward as possible with respect to the shaft of the driven sprocket 132 (the output shaft of the power transmission unit 13). When viewed from the side, the drive pulley 147a of the blade drive unit 147 is positioned at the rear (rear side) of the working unit 14, and the driven pulley 147b is positioned forward of the drive pulley 147a, making it possible to position the rotating shaft 141a to which the grass cutting blade 141c is attached as far forward as possible in relation to the axis of the driven sprocket 132, and the working unit 14 can be positioned as far forward as possible in relation to the axis of the driven sprocket 132. In this configuration, the drive pulley shaft 147a1 (input shaft of the blade drive unit) is located rearward of the rear cover shaft 1441 (rotation shaft), the driven pulley shaft 147b1 (concentric with the rotation shaft 141a) is located forward of the drive pulley shaft 147a1, the working unit input shaft 145 (working unit input shaft) is located rearward of the driven pulley shaft 147b1 (concentric with the rotation shaft 141a), and a part of the working unit input shaft 145 is located rearward of the rear cover shaft 1441. It is also preferable that the swing fulcrum 148 c of the gauge roller 148 be located forward of the rear cover shaft 1441 , and that the roller body 148 b of the gauge roller 148 be located rearward of the rear cover shaft 1441 . Furthermore, the rear end of the rear cover 144 is preferably disposed so as to be located rearward of the rear end of the gauge roller 148 in a side view, whether in the closed state or in the open state (see Figs. 3(a) and (b)). Since the rear cover 144 serves as a guide when discharging the cut weeds, such a configuration makes it easier to discharge the cut weeds, etc., rearward of the gauge roller 148, and can prevent the cut weeds, etc., from interfering with the gauge roller 148 and accumulating in the covers (the front cover 142 and the rear cover 144). In addition, in order to prevent the cut weeds from accumulating between the gauge roller 148 and the scraper member facing it, the rear end of the rear cover 144 in the closed state is preferably disposed rearward of the rear end of the scraper member in a side view. It is preferable to position it at least rearward of the position where the gauge roller 148 and the scraper member face each other. Furthermore, when the rear cover 144 is formed in a straight line when viewed from the side, as in the grass cutter 1 of this embodiment, it is preferable to arrange the gauge roller 148 and the scraper member forward of the extension line of the rear cover 144 when viewed from the side.

[0036] [Variations] FIG. 6 shows a modified example of the grass cutter 1 of the present invention in a stored state with the rear cover 144 closed, where (a) is a view from above, (b) is a view from the left, and (c) is a view from the rear. FIG. 7 shows a modified example of the mower 1 of the present invention in a stored state with the rear cover 144 open, where (a) is a view from above, (b) is a view from the left, and (c) is a view from the rear. 8(a) is a partially enlarged view of FIG. 6(b), and FIG. 8(b) is a partially enlarged view of FIG. 7(b). In the embodiment, a chain drive mechanism is used as the power transmission unit 13, but in this modified example, a drive mechanism using a universal joint is used. The power transmission unit 13 has a universal joint (not shown) on the mounting unit 11 side, a universal joint 135 on the working unit 14 side, and a drive shaft 136 between the two universal joints. The power transmitted to the universal joint 135 is transmitted to a working unit input shaft 145 provided on the left side (outside) of a blade driving unit 147 provided on the left side (outside) of the left side plate 143. The power transmitted to the working unit input shaft 145 is transmitted via a bevel gear to a driving pulley shaft 147a1 of the blade driving unit 147, and then via the driving pulley 147a, the belt 147c, and the driven pulley 147b to a driven pulley shaft 147b1, and finally to the rotating shaft 141a, thereby driving the working rotor 141. Note that the working unit input shaft 145 is not limited to being provided on the left side (outside) of the blade driving unit 147 as described above, and may be provided on the right side (inside) of the blade driving unit 147.

[0037] In this modified example as well, in order to dispose the working unit 14 close to the traveling vehicle body 2, the working unit 14 is disposed as far forward as possible, as described below. By positioning the drive pulley 147a of the blade drive unit 147 at the rear of the working unit 14 and positioning the driven pulley 147b forward of the drive pulley 147a, it is possible to position the rotating shaft 141a to which the grass cutting blade 141c is attached forward of the universal joint 135, and the working unit 14 can be positioned close to the traveling body 2. In this configuration, the drive pulley shaft 147a1 (input shaft of the blade drive unit) is located rearward of the rear cover shaft 1441 (rotation shaft), the driven pulley shaft 147b1 (concentric with the rotation shaft 141a) is located forward of the drive pulley shaft 147a1, the working unit input shaft 145 (working unit input shaft) is located rearward of the driven pulley shaft 147b1 (concentric with the rotation shaft 141a), and the working unit input shaft 145 is located rearward of the rear cover shaft 1441.

[0038] The grass cutter 1 in the above-described embodiment and modified example is an offset grass cutter in which the working unit 14 can be offset to the side of the traveling body 2, but this is not limited to this, and the grass cutter may be one in which the working unit 14 cannot be offset to the side of the traveling body 2.

[0039] As described above, the grass cutter 1 according to the embodiment and its modified examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments and their modified examples, and the present invention includes design changes and the like that do not deviate from the gist of the present invention. Furthermore, the above-described embodiment and its modified examples can be combined by utilizing each other's technologies, so long as there are no particular contradictions or problems in the purpose, configuration, and the like. [Explanation of symbols]

[0040] 1. Grass trimmer 11 Mounting part 111 Hitch frame 112 Gearbox 113 Grass trimmer input shaft 12 Offset mechanism 121 Offset Frame 122 Link rod 123 Support Frame 124 Elastic member 13 Power transmission section 131 Drive sprocket 132 Driven sprocket 133 Roller Chain 134 1st Bevel Gear 135 Universal joint 136 Drive shaft 14 Working section 141 Working rotor 141a Rotating shaft 141b Bracket 141c grass cutting blade 142 Front cover 143 Side Panel 144 Rear cover 144a Rear cover body 144b Fixed piece 144c Bolts and nuts 1441 Rear cover shaft 145 Working input shaft 146 2nd bevel gear 147 Blade drive unit 147a Drive pulley 147a1 Drive pulley shaft 147b Driven pulley 147b1 Driven pulley shaft 147c Belt 147d Tensioner 148 Gauge Roller 148a Arm 148b Roller body 148c Swing fulcrum 15 Rotation mechanism 2 Running vehicle 21 Rear tires 22 Three-point linkage mechanism 23 PTO shaft

Claims

1. A working section that performs grass cutting work; A mounting portion that is connected to a connecting mechanism of a traveling vehicle body, The working unit includes a grass cutting blade, a rotating shaft to which the grass cutting blade is attached, a cover that covers at least the upper part of the grass cutting blade and the rotating shaft, and a blade drive unit that transmits power from the traveling body to the rotating shaft, and the rotating shaft extends in a horizontal direction perpendicular to the traveling direction of the traveling body, A rotating cover is provided which is pivotally supported on a rotating shaft at the rear of the cover and can rotate up and down, The input shaft of the blade drive unit is located rearward of the rotation shaft. A grass cutter characterized by:

2. A working section that performs grass cutting work; A mounting portion that is connected to a connecting mechanism of a traveling vehicle body, The working unit includes a grass cutting blade, a rotating shaft to which the grass cutting blade is attached, a cover that covers at least the upper part of the grass cutting blade and the rotating shaft, and a blade drive unit that transmits power from the traveling body to the rotating shaft, and the rotating shaft extends in a horizontal direction perpendicular to the traveling direction of the traveling body, A rotating cover is provided which is pivotally supported on a rotating shaft at the rear of the cover and can rotate up and down, The input shaft of the blade drive unit is located rearward of the rotation shaft. A grass cutter characterized by:

3. A working section that performs grass cutting work; A mounting portion that is connected to a connecting mechanism of a traveling vehicle body, The working unit includes a grass cutting blade, a rotating shaft to which the grass cutting blade is attached, a cover that covers at least the upper part of the grass cutting blade and the rotating shaft, and a blade drive unit that transmits power from the traveling body to the rotating shaft, and the rotating shaft extends in a horizontal direction perpendicular to the traveling direction of the traveling body, A rotating cover is provided which is pivotally supported on a rotating shaft at the rear of the cover and can rotate up and down, The input shaft of the blade drive unit is located rearward of the rotation shaft and the pivot shaft. A grass cutter characterized by:

4. The working unit has a working unit input shaft that inputs power from the traveling vehicle body, 4. The grass cutter according to claim 1, wherein the working unit input shaft is located rearward of the rotating shaft.

5. The working unit has a working unit input shaft that inputs power from the traveling vehicle body, 4. The grass cutter according to claim 1, wherein at least a portion of the working unit input shaft is located rearward of the rotating shaft.

6. an offset mechanism that connects the working unit to the mounting unit so as to be movable between a rear position of the traveling vehicle body and a position offset to the side of the traveling vehicle body; a power transmission unit that transmits power from the traveling vehicle body from the mounting unit to the working unit; The grass cutter according to any one of claims 1 to 3, further comprising:

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