Grass trimmer

Abstract

To provide a grass-cutting machine that can improve work efficiency. [Solution] The grass cutting machine 1 comprises a rear cover body 8 that covers the rear upper part of the grass cutting work body 3, and a guide body 9 provided on the rear cover body 8 for guiding the shredded grass. The guide body 9 has a plurality of guide members 109 arranged in the left-right direction, and each of these guide members 109 has a guide plate portion 152 for guiding the shredded grass. The front end 161 of the guide plate portion 152 of each guide member 109 is positioned in an inclined shape, higher in the front and lower in the rear.

Description

Technical Field

[0001] Embodiments of the present invention relate to a grass cutting machine.

Background Art

[0002] Conventionally, for example, a grass cutting machine described in Patent Document 1 below is known.

[0003] This conventional grass cutting machine includes, for example, a machine body connected to a traveling vehicle such as a tractor, a grass cutting working body provided on the machine body for performing a grass cutting operation while rotating, a cover body covering the upper part of the grass cutting working body, and a guiding body provided on the cover body for guiding the shredded grass. Further, the guiding body has a plurality of guiding members arranged side by side in the left-right direction on the lower surface (back surface) of the cover body, and the front end of the guiding plate portion of each guiding member is positioned vertically.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above conventional grass cutting machine, when cutting grass in a field or the like, the shredded grass may get caught on the front end of the guiding plate portion of the guiding member. In this case, for example, the grass cutting operation needs to be interrupted once, and an operation such as removing the caught grass is required. As a result, there is a risk of a decrease in work efficiency.

[0006] [[ID=4३]] Therefore, one of the problems of the embodiments of the present invention is to provide a grass cutting machine capable of improving work efficiency.

Means for Solving the Problems

[0007] An embodiment of the present invention provides a grass cutting machine comprising a machine body, a grass cutting work body provided on the machine body, a cover body covering the upper part of the grass cutting work body, and a guide body provided on the cover body for guiding shredded grass, wherein the guide body has a plurality of guide members provided on the cover body, the guide members have a guide plate portion for guiding shredded grass, and the front end of the guide plate portion is positioned in an inclined shape, higher in the front and lower in the rear. [Effects of the Invention]

[0008] According to embodiments of the present invention, work efficiency can be improved. [Brief explanation of the drawing]

[0009] [Figure 1] This is a side view of a grass cutting machine according to one embodiment of the present invention. [Figure 2] This is a plan view of the same grass cutting machine. [Figure 3] A front view of the same grass-cutting machine. [Figure 4] A partial front view of the grass-cutting workpiece of the same grass-cutting machine. [Figure 5] This is an enlarged view of section A in Figure 4. [Figure 6] This is an exploded perspective view showing the grass cutting tines of the same grass cutting workpiece. [Figure 7] This is a partial perspective view of the same grass cutting machine. [Figure 8] This is a partial cross-sectional view of the same grass cutting machine as shown above. [Figure 9] This is a side view of the guide member of the guide body in the same grass cutting machine. [Figure 10] This is a partial plan view of the same grass-cutting machine. [Figure 11] (a) is a partial plan view of the rear cover body, and (b) is a plan view of the guide member. [Figure 12] (a) to (c) are diagrams showing examples of discharge patterns (work patterns) for the guide members. [Modes for carrying out the invention]

[0010] An embodiment of the present invention will be described with reference to FIGS. 1 to 12.

[0011] In the figure, reference numeral 1 denotes a mowing machine which is an agricultural working machine. This mowing machine 1 is connected to the rear part of a tractor (not shown), which is a traveling vehicle for example, and performs a mowing operation (a grass shredding operation), which is an agricultural operation, while moving forward (in the traveling direction) by the traveling of the tractor.

[0012] More specifically, the mowing machine 1 is a relatively large straw chopper that is detachably connected to the three-point link part at the rear of the tractor, and shreds grasses to be mowed (mainly, for example, wheat straw and green manure) while moving forward (in the traveling direction) by the forward traveling of the tractor.

[0013] As shown in FIGS. 1 to 3 etc., the mowing machine 1 includes a machine body 2 that is detachably connected to the three-point link part (agricultural working machine lifting support part) at the rear of the tractor, and a mowing working body 3 that is rotatably provided on the machine body 2 and performs a mowing operation while rotating in a predetermined rotation direction (up-cut direction) about a rotation center axis X in the left-right direction.

[0014] The mowing machine 1 also includes a fixed cutting body (cutting auxiliary tool) 5 that cuts grasses such as wheat straw between the mowing working body 3, and a scattering prevention body 6 that prevents the scattering of flying objects from the mowing working body 3 side forward. The flying objects from the mowing working body 3 side are, for example, stones, earth and sand, mowed grass (shredded grasses), etc.

[0015] Furthermore, the mowing machine 1 includes a rear cover body 8 that is provided on the machine body 2 so as to be pivotally adjustable in the up-down direction about a shaft part 7 in the left-right direction and covers the upper rear side of the mowing working body 3, and a guide body (a discharge guide body which is a deflector) 9 that is provided on the rear cover body 8 and guides the shredded grasses.

[0016] Further, the grass cutting machine 1 includes a gauge roller 11 provided on the machine body 2 so as to be pivotally adjusted in the vertical direction about a shaft portion 10 in the left-right direction, a scraper 12 provided on the gauge roller 11 and capable of being angle-adjusted, and a stand 13 provided on the machine body 2 and capable of being vertically adjusted.

[0017] The machine body 2 has a three-point hitch portion 16 that is detachably connected (mounted) to the three-point hitch portion at the rear of the tractor. The three-point hitch portion 16 is such that, for example, the top pin 17 and the left and right lower pins 18 are directly connected to the top link and the left and right lower links of the three-point hitch portion.

[0018] More specifically, the three-point hitch portion 16 includes, in addition to the top pin 17 and the left and right lower pins 18, a top mast 19, a mast arm 20, a mast arm mounting plate 21, a stay 22, a lower pin frame 23, a hook with a lever 24, a hitch arm 25, a hitch plate 26, and the like.

[0019] The top mast 19 that holds the top pin 17 is pivotally mounted at the tip of the mast arm 20 whose base end is attached to the mast arm mounting plate 21 so as to be pivotable in the vertical direction about a shaft portion 28 in the left-right direction. Therefore, for example, during grass cutting work in a field, the machine body 2 can tilt forward and backward according to the unevenness of the field surface and follow the unevenness. A joint hanger 29 for supporting a joint is attached to the stay 22 that is a reinforcing body of the mast arm 20.

[0020] <8000105>The lower pin 18 is fixed to the left and right ends of a lower pin frame 23 that is detachably locked by the left and right hitch arms 25 and the hook with a lever 24. The hitch arm 25 is detachably attached to the hitch plate 26.

[0021] Furthermore, the machine body 2 has a transmission case section 32, which is an input shaft holding section that rotatably holds the input shaft 31 connected to the PTO shaft at the rear of the tractor via a joint. A cylindrical frame pipe section 33, which is longitudinal in the left-right direction, is connected to the left side of this transmission case section 32 (left side when facing the direction of travel). Oil plugs 34 and 35 are detachably attached to the oil ports of the transmission case section 32 and the frame pipe section 33, and drain bolts 36 and 37 are detachably screwed into the drain ports of both.

[0022] A power transmission means 40 is connected to the input shaft 31 to transmit the power input to the input shaft 31 (power from the tractor) to the grass-cutting work unit 3, which is the work unit. The power transmission means 40 includes a transmission shaft 41 in the frame pipe section 33, a drive-side pulley 42, a driven-side pulley 43, an endless series of belts 44 (for example, five) stretched between these two pulleys 42 and 43, and a tension adjustment mechanism 45 for adjusting the tension of these belts 44.

[0023] The tension adjustment mechanism 45 consists of a tension pulley 46, a pulley arm 47, a tension rod 48, a fixing plate 49, a compression spring 50, a washer 51, and a nut 52, and the tension of the belt 44 can be adjusted by adjusting the nut 52. The tension adjustment mechanism 45, both pulleys 42 and 43, and the belt 44 are housed in a box-shaped pulley case 53. The pulley case 53 is detachably attached to the left side plate 56 of the machine body 2.

[0024] Furthermore, the machine body 2 has left and right side plates 56 that cover the sides of the grass-cutting work body 3, and a cover portion 57 that covers the front and top (front upper) of the grass-cutting work body 3. An elastic rubber cover 55, which is an elastically deformable cover, is detachably attached to the rear end of the cover portion 57. In addition, a mast arm mounting plate 21 and a hitch plate 26 are fixed to the cover portion 57.

[0025] The two side plates 56, which are spaced apart from each other, are connected by a rectangular reinforcing pipe 58 that is elongated in the left-right direction, and a boss 60 is detachably attached to each of these side plates 56. The grass-cutting workpiece 3 is then rotatably supported by the left and right bosses 60.

[0026] Each side plate 56 is provided with a hole 61 for mounting the front gauge wheel, a hole 62 for mounting the screw-type gauge roller, and a mounting section 63 for a stand with casters. The front gauge wheel, screw-type gauge roller, and stand with casters, which are not shown in the figure, are all optional parts.

[0027] Furthermore, the aircraft body 2 has a stand mounting section 66 to which a stand 13 used when not in operation is attached so as to be vertically adjustable, and this stand mounting section 66 is detachably attached to the hitch plate 26.

[0028] The stand 13 has one working hole 67 and multiple (e.g., three) non-working holes 68, and a pin (e.g., a pin with a hook) 70 is removably inserted into one of these holes and into a mounting hole 69 of the stand mounting portion 66 to hold it in the desired position.

[0029] On the other hand, the grass-cutting workpiece 3 performs grass-cutting work by rotating (high-speed driven rotation) in an up-cut direction, which is a predetermined rotation direction, around the rotational axis X, using power from the power transmission means 40. As shown in Figures 4 to 6, it has a left-right longitudinal rotating shaft (claw shaft) 71 having a plurality of claw mounting parts 73 located at different positions in the horizontal axial direction (left-right direction), and grass-cutting claws 72 that are detachably attached to each claw mounting part 73 of this rotating shaft 71 by mounting means 74. The mounting means 74 is, for example, a bolt 75 and a nut 76.

[0030] The rotating shaft 71 is a drive shaft that rotates in an up-cut direction about the rotational axis X with power from the power transmission means 40, and has a cylindrical shaft body portion 77 that is longitudinal in the left-right direction, and a plurality of protruding claw mounting portions 73 that are provided on the cylindrical outer surface of the shaft body portion 77 so as to protrude radially outward from the outer surface and are each located at different positions (positions offset in the axial direction) with respect to the axial direction of the rotating shaft 71.

[0031] A pulley shaft 78, which is a mounting shaft, is provided at the end face of the axial end (the end on the left side in the direction of travel) of the shaft body portion 77, and the driven pulley 43 of the power transmission means 40 is attached to this pulley shaft 78 (see Figure 3).

[0032] Each claw mounting portion 73 is composed of a pair of opposing plates 81 fixed to the outer circumferential surface of the shaft body portion 77 and spaced apart from each other, and each of these opposing plates 81 has a mounting hole 82. Each opposing plate 81 has a pair of opposing plate portions 83 spaced apart from each other and a connecting plate portion 84 that connects these two opposing plate portions 83, and a mounting hole 82 is formed in this connecting plate portion 84.

[0033] Each grass cutting tine 72 includes, for example, a pair of plate-shaped tine members (blade members) 91 that are spaced apart from each other, a plate-shaped wing member 92 located between these two tine members 91, two annular spacer members 93, and a cylindrical collar member 94. However, the grass cutting tine 72 is not limited to the members 91 to 94, and may also consist of, for example, only a pair of tine members 91 or only ginkgo-leaf shaped tine members, although these are not shown in the figures.

[0034] The claw member 91 performs grass cutting work while rotating in an up-cut direction, and has a mounting plate portion (mounting base portion) 97 in which mounting holes 96 are formed, and a blade plate portion 98 that is bent and connected to the mounting plate portion 97, and pointed blade portions 99 are formed at both ends in the width direction of the blade plate portion 98.

[0035] The blade member 92 rotates together with the claw member 91 to generate airflow in the direction of rotation (up-cut direction), and has a cylindrical portion 101 formed in a substantially cylindrical shape, and a blade portion 102 connected to the cylindrical portion 101, with its tip curved toward the direction of rotation, and a pointed blade portion 103 is formed at the tip of the blade portion 102.

[0036] Then, the collar member 94 is inserted into the mounting hole 96 of the claw member 91, the cylindrical portion 101 of the blade member 92, and the spacer member 93. The shaft portion 75a of the bolt 75 is then inserted into the collar member 94 and the mounting hole 82 of the claw mounting portion 73. Subsequently, the nut 76 is screwed onto the shaft portion 75a of the bolt 75, thereby attaching the grass cutting claw 72 to the claw mounting portion 73.

[0037] Thus, the grass cutting claws 72 are attached to the claw mounting portion 73 by mounting means 74 consisting of bolts 75 and nuts 76, such that the tips of both claw members 91 face away from each other, forming a roughly V-shape. The grass cutting claws 72 are rotatable around the shaft portion 75a of the bolt 75 relative to the claw mounting portion 73. In other words, the grass cutting claws 72 attached to each claw mounting portion 73 of the rotating shaft 71 are rotatable within a predetermined range of rotation around the rotation center axis Y in the left-right direction relative to the claw mounting portion 73. Furthermore, the two claw members 91 and the blade member 92 that constitute the grass cutting claws 72 are each rotatable independently.

[0038] Furthermore, the grass cutting claw 72 is rotatable in the circumferential direction of the shaft 75a of the bolt 75 fixed to the claw mounting portion 73, but it is not rotatable in the axial direction (left-right direction) of the shaft 75a. In other words, the base of the grass cutting claw 72 is sandwiched between the two opposing plates 81 of the claw mounting portion 73, and there is almost no gap between the claw member 91 and the opposing plates 81 (see Figure 5).

[0039] Furthermore, the number of grass cutting tines 72 varies depending on the working width of the grass cutting workpiece 3 (axial length of the rotating shaft 71). For example, there are 30 tines (the axial length of the rotating shaft 71 is approximately 2.9 m), and the number of corresponding tine mounting parts 73 is the same.

[0040] Furthermore, in this grass-cutting workpiece 3, in a side view, the angles (circumferential angle difference) between the two adjacent claw mounting portions 73 with respect to the axial direction of the rotation axis 71 are all within the range of 135 to 180 degrees (135 degrees or more and 180 degrees or less).

[0041] More specifically, in a side view, the angle formed by a plurality of adjacent double-claw mounting portions 73 with respect to the axial direction of the rotation axis 71 is one angle within the range of 135 degrees to 180 degrees, i.e., 180 degrees, and the angle formed by a plurality of other adjacent double-claw mounting portions 73 with respect to the axial direction of the rotation axis 71 in a side view is another angle within the range of 135 degrees to 180 degrees, i.e., 135 degrees.

[0042] Furthermore, the multiple claw mounting portions 73 are arranged in a substantially spiral direction at different positions with respect to the axial direction (left-right direction) of the rotation axis 71, such that only one different angle (e.g., 180 degrees) and another angle (e.g., 135 degrees) alternate sequentially from one axial end to the other axial end of the rotation axis 71.

[0043] Next, as shown in Figures 7 to 12, the rear cover body 8 is attached to the rear end of the cover portion (front cover body) 57 of the machine body 2 via a plurality of hinges 105 so as to be rotatable in the vertical direction around the shaft portion 7.

[0044] The guide body 9 has a plurality of plate-shaped guide members 109 (for example, 10) that protrude downward from the lower surface (back surface) of its rotatably adjustable rear cover body 8. These plurality of guide members 109 are positioned side by side in the left-right direction with some space between them. The five guide members 109 (109L) located on the left side and the five guide members 109 (109R) located on the right side have a symmetrical shape.

[0045] Furthermore, multiple guide members 109 (109L, 109R) are detachably attached to the underside of the rear cover body 8 by front mounting means 111 and rear mounting means 112. In addition, these multiple guide members 109 (109L, 109R) can be rotated and adjusted in the left-right direction relative to the rear cover body 8. In other words, the guidance direction (discharge direction) of each guide member 109 can be changed.

[0046] The front mounting means 111 is, for example, a bolt 113 and a nut 114, and the rear mounting means 112 is, for example, a bolt (insertion member) 115 and a nut 116.

[0047] The rear cover body 8 has a horizontally elongated, plate-shaped cover body portion 121 that covers the rear upper part of the grass-cutting work body 3, and cover side plate portions 122 provided at both left and right ends of the cover body portion 121. A hinge 105 is attached to the front end of the cover body portion 121 via a shaft portion 7. A handle 120 is attached to the rear end of the cover body portion 121 for the operator to grip when rotating the rear cover body 8 vertically.

[0048] The cover body 121 has mounting portions 123 at multiple locations (for example, 10 locations) spaced apart in the left-right direction, and guide members 109 are detachably attached to the lower surface of these mounting portions 123 by mounting means 111 and 112.

[0049] The mounting portion 123 has one mounting hole 126 located on the front side (one hole into which a bolt 113 of the front mounting means 111 can be inserted) and a plurality (for example, two or three) of cover-side adjustment holes 127 located on the rear side and on a virtual circle centered on the mounting hole 126 in a plan view (a plurality of holes into which a bolt 115 of the rear mounting means 112 can be inserted).

[0050] The number of adjustment holes 127 on the cover side varies; for example, there are two adjustment holes 123 at the two mounting points 123 on the left-right center side of the cover body 121, but for example, there are three adjustment holes 123 at the other eight mounting points 123. However, this is not limited to this, and the number of adjustment holes 127 on the cover side at each mounting point 123 can be any number, for example, the same number at each mounting point 123.

[0051] The cover side plate portion 122 has a plurality of opening holes 131 and one closing hole 132 located on a virtual circle centered on the shaft portion (the pivot point of the rear cover body 8) 7 in a side view, i.e., five opening holes 131 and one closing hole 132 at 10-degree intervals. The five opening holes 131 consist of one upper limit position hole 131 (131a) for setting the rear cover body 8 to the upper limit position and four intermediate position holes 131 (131b, 131c, 131d, 131e) for setting the rear cover body 8 to an intermediate position.

[0052] Therefore, the rear cover body 8 is adjustable to rotate up and down in steps to six positions corresponding to the holes 131 and 132 (upper limit position, lower limit position, and four intermediate positions between them).

[0053] Typically, the rear cover body 8 is set to the upper limit or intermediate position to open the machine and perform grass cutting work. In this case, the shredded grass is sequentially guided by the cover part 57, rubber cover 55, rear cover body 8, and guide member, as shown by the arrows in Figure 8, and discharged (released) to the rear. The position of the rear cover body 8 (positioning and fixing position) shown by the solid line in Figure 8 is the lowest intermediate position when the machine is open and the guide member 109 is attached.

[0054] On the other hand, in order to discharge the shredded grass downwards rather than backwards, the rear cover body 8 must be set to its lower limit position (closed position) to close it, in which case the guide member 109 must be removed from the rear cover body 8. In other words, when the rear cover body 8 is in the closed position and close to the grass cutting work body 3, the guide member 9 is removed before performing the grass cutting work.

[0055] Furthermore, as shown in Figure 7, the grass cutting machine 1 is equipped with a positioning and fixing means 133 for positioning and fixing the rear cover body 8 to a desired position (for example, one of six positions) relative to the machine body 2, and a lifting assist means 134 for assisting the operator in lifting (rotating upward) the rear cover body 8 manually. The positioning and fixing means 133 and the lifting assist means 134 are provided on both the left and right ends of the machine body 2, respectively.

[0056] The positioning and fixing means 133 has a holder 136 attached to the side plate portion 56 by bolts 135, and a positioning and fixing pin (positioning and fixing member) 138 is held by a holding portion 137 of this holder 136.

[0057] The pin 138 is removably inserted into holes 131 and 132 in the cover side plate portion 122, and its insertion positions and fixes the rear cover body 8 in the desired position. When changing the position of the rear cover body 8, the pin 138 can be held in place by pulling it out of holes 131 and 132 against the biasing force of the compression spring 139 and hooking it into the recess 140 of the retainer 136.

[0058] The lifting assist means 134 has an extendable gas spring (biasing body) 141 for lifting assist, and by utilizing the biasing force of this gas spring 141 to bias the rear cover body 8 upward, it assists in lifting the rear cover body 8 relative to the aircraft body 2.

[0059] The gas spring 141 has a main body portion 142 filled with a high-pressure gas such as nitrogen gas, and a rod portion 143 that moves in and out of the main body portion 142. The base end of the main body portion 142 is rotatably attached to the mounting portion 144 of the side plate portion 56 via a mounting shaft 145, and the tip of the rod portion 143 is rotatably attached to the mounting portion 146 of the cover side plate portion 122 via a mounting shaft 147. The mounting shaft 147 is held by a holder 150 which is attached to the holder mounting portion 148 of the cover side plate portion 122 with a bolt 149. The side plate portion 56 of the machine body 2 has a recess 130 formed therein to avoid interference, into which the mounting portion 146 of the cover side plate portion 122 fits when the rear cover body 8 is in the closed state.

[0060] On the other hand, the plate-shaped guide member (guide plate) 109 that constitutes the guide body 9 is made of, for example, a single bent metal plate, and has a mounting plate portion 151 that is detachably attached by mounting means 111 and 112 to the lower surface of the mounting portion 123 of the cover body portion 121 of the rear cover body 8 so as to overlap with the lower surface, and a vertical guide plate portion 152 that protrudes downward from the side end of the mounting plate portion 151 and guides the shredded grass.

[0061] The mounting plate portion 151 is formed in a roughly rectangular shape and has one mounting hole 153 located on the front side (one hole into which a bolt 113 of the front mounting means 111 can be inserted) and a plurality (for example, two) guide-side adjustment holes 154 located on the rear side and positioned on a virtual circle centered on the mounting hole 153 in a plan view (a plurality of holes into which a bolt 115 of the rear mounting means 112 can be inserted). The number of guide-side adjustment holes 154 is arbitrary; for example, there may be one instead of a plurality. Alternatively, for example, it may be an elongated hole formed in an arc shape centered on the mounting hole 153.

[0062] Then, the bolt 113 of the front mounting means 111 is inserted into the mounting holes 126 and 153 and a nut 114 is screwed onto the inserted bolt 113, and the bolt 115 of the rear mounting means 112 is inserted into the adjustment holes 127 and 154 and a nut 116 is screwed onto the inserted bolt 115, thereby attaching the mounting plate portion 151 of the guide member 109 to the lower surface of the mounting portion 123 of the cover body portion 121 of the rear cover body 8. As a result, the guide member 109 can be rotated and adjusted in the left and right directions with respect to the rear cover body 8, with respect to the shaft portion (pivot point) of the front bolt 113.

[0063] Furthermore, the rear bolt (insertion member) 115, which can be inserted into and removed from the adjustment holes 127 and 154, is removably inserted into one of the cover-side adjustment holes 127 selected from among the multiple cover-side adjustment holes 127 and one of the guide-side adjustment holes 154 selected from among the multiple guide-side adjustment holes 154. In other words, as shown in Figure 10, by selecting the adjustment holes 127 and 154 into which the bolt 115 is inserted, the guiding direction of the guide member 109 can be changed in six or four steps at 10-degree intervals, for example.

[0064] The guide plate portion 152 is formed in a roughly rectangular shape and has a protruding portion 156 that, in a plan view, is positioned to protrude further rearward than the rear end of the mounting plate portion 151.

[0065] Here, as shown in Figure 9, the straight front end (front edge) 161 of the guide plate portion 152 is positioned in a direction that is inclined with a predetermined inclination angle α relative to the lower surface (planar mounting surface) of the cover body portion 121 of the rear cover body 8 when viewed from the side.

[0066] The predetermined inclination angle α is, for example, 45 degrees or less, and preferably 35 degrees. This angle α is also the angle formed by the front end 161 and the upper end 162 of the guide plate portion 152. The angle β formed by the front end 161 and the lower end 163 of the guide plate portion 152 is, for example, 120 degrees.

[0067] Furthermore, a convex, curved end 160 is provided between the front end 161 and the lower end 163, and these front end 161, curved end 160, and lower end 163 are smoothly continuous. This prevents the shredded grass that moves along the front end 161, which is positioned in a sloping manner with the front higher and the rear lower, from getting caught on the front lower corner of the guide plate section 152 during grass cutting.

[0068] Furthermore, as shown in Figures 8 and 9, when the rear cover body 8 is positioned and fixed at the lowest intermediate position (lowest position with the guide member attached) by inserting the pin 138 into the intermediate position hole 131 (131e), the straight lower end 163 of the guide plate portion 152 is positioned horizontally near the upper surface of the square pipe-shaped reinforcing pipe portion (rear frame pipe) 58. At this time, the straight rear end 164 of the guide plate portion 152 is positioned vertically in front of the rear surface of the reinforcing pipe portion 58. Note that the configuration is not limited to the rear end 164 being positioned in front of the rear surface of the reinforcing pipe portion 58; for example, the rear end 164 may be positioned behind the rear surface of the reinforcing pipe portion 58, or it may be a configuration that can be extended to the rear.

[0069] Next, we will explain the operation of the grass cutting machine 1.

[0070] With the three-point connecting section 16 of the grass cutting implement 1 directly connected to the three-point link section of the tractor, when the entire grass cutting implement 1 is moved forward by the forward movement of the tractor, the grass cutting tines 72 of the grass cutting body 3 rotate at high speed in a predetermined up-cut direction with the rotation axis X together with the rotation axis 71 relative to the machine body 2, and perform grass cutting work.

[0071] During this grass cutting operation, the grass cutting claws 72 of the grass cutting workpiece 3 may rotate within a predetermined range of rotation about the rotation center axis Y relative to the claw mounting portion 73 of the rotating shaft 71. However, in a side view, the angles formed by the two adjacent claw mounting portions 73 with respect to the axial direction of the rotating shaft 71 are all within the range of 135 to 180 degrees (for example, a combination of two angle differences such as 180 degrees and 135 degrees). Accordingly, contact between the two adjacent grass cutting claws 72 is prevented (suppressed).

[0072] Furthermore, as shown by the solid line in Figure 8, for example, if the grass cutting operation is performed with the rear cover body 8, to which each guide member 109 of the guide body 9 is attached, positioned and fixed at the lowest intermediate position as a desired position, the shredded grass will be sequentially guided by the cover portion 57, rubber cover 55, rear cover body 8 and guide member 109 of the machine body 2, as shown by the arrow in Figure 8, and discharged to the rear.

[0073] The same applies when the rear cover body 8 is positioned and fixed at other intermediate or upper positions; however, only in the case of the lower limit position, the shredded grass is discharged downwards rather than towards the rear because it is closed by the rear cover body 8 positioned and fixed at that lower limit position.

[0074] Here, for example, after the wheat harvest, the harvested wheat straw (wheat stalks) may pile up in rows on the field. In this case, in order to facilitate subsequent tilling work using a rotary tiller, it is desirable to shred the harvested wheat straw and distribute the shredded straw evenly across the field.

[0075] Therefore, in order to spread the shredded straw (grass) as widely as possible so that it is evenly dispersed, the multiple guide members 109 are set to the discharge pattern shown in Figure 12(a).

[0076] In this case, the five guide members 109 (109L) located on the left side guide and discharge the shredded grass towards the diagonal rear left, and the five guide members 109 (109R) located on the right side guide and discharge the shredded grass towards the diagonal rear right.

[0077] Furthermore, the multiple guide members 109 can be set as needed to, for example, the discharge pattern shown in Figure 12(b) (discharge only to the diagonally left rear on one side) or the discharge pattern shown in Figure 12(c) (discharge towards the inward side).

[0078] However, when setting the discharge pattern as shown in Figure 12(b), it is necessary to swap the left and right sides of the two guide members 109 (109L, 109R) on the left-right central side. In other words, the right guide member 109 (109R) is attached to the left mounting part 123 of the two mounting parts 123 on the left-right central side of the cover body 121, and the left guide member 109 (109L) is attached to the right mounting part 123 of that mounting part.

[0079] Therefore, the above-described grass cutting machine 1 is equipped with a guide body 9 that guides the grass after it has been shredded by the grass cutting workpiece 3. This guide body 9 has a plurality of guide members 109 arranged in a left-right direction on the lower surface side of the rear cover body 8 which is vertically rotatable. The front end 161 of the guide plate portion 152 of each of these guide members 109 is positioned in an inclined shape, higher in the front and lower in the rear, regardless of the positioning and fixing position of the rear cover body 8 when it is in the open state during grass cutting. As a result, the shredded grass does not get caught on the inclined front end 161 and is smoothly guided (directed) diagonally downward and discharged to the rear. Unlike conventional methods, there is no need to interrupt the grass cutting work to remove any caught grass, thus improving work efficiency and reducing the burden on the operator.

[0080] Furthermore, since the multiple guide members 109 are provided on the rear cover body 8 so as to be rotatable and adjustable in the left-right direction, the discharge pattern of these guide members 109 can be set as appropriate.

[0081] Furthermore, it is possible to prevent (suppress) the occurrence of problems such as the grass cutting tines 72 coming into contact with each other during grass cutting work in fields, and thus, problems such as chipping of the grass cutting tines 72 and the generation of noise due to tine contact can be appropriately prevented.

[0082] Furthermore, the grass cutting machine is not limited to a configuration that prevents grass cutting at an offset position. For example, it may be configured such that a grass cutting workpiece (working unit) that can be adjusted left and right relative to the tractor can be set to a desired offset position to perform grass cutting.

[0083] Furthermore, the mounting means for detachably attaching the guide member of the guide body to the cover body is not limited to bolts and nuts; for example, a detachable pin (insertion member) may be used. [Explanation of Symbols]

[0084] 1. Grass trimmer 2 units 3. Grass cutting work unit 8 Rear cover body, which is a cover body 9 Guide 109 Guide Member 115 Bolts, which are insertion members. 127 Adjustment holes on the cover side 134 Lifting assist means 152 Information board section 154 Guide side adjustment hole 161 Front end of the information board section α predetermined inclination angle

Claims

1. The aircraft and, The aforementioned machine is equipped with a grass-cutting work unit, A cover body that covers the top of the aforementioned grass-cutting workpiece, The cover body is provided with a guide body for guiding the shredded grass, The guide body has a plurality of guide members provided on the cover body, The aforementioned guide member has a guide plate portion for guiding the shredded grass, The front end of the aforementioned guide plate section is positioned in a sloping manner, with the front being higher and the rear lower. A grass cutting machine characterized by the following features.

2. The front end of the information board is positioned along a direction that inclins with a predetermined angle relative to the cover body when viewed from the side. The grass cutting machine according to feature 1.

3. The specified inclination angle is 45 degrees or less. The grass cutting machine according to feature 2.

4. The guide member is mounted on the cover body so as to be rotatable and adjustable in the left-right direction. A grass cutting machine according to any one of claims 1 to 3.

5. The cover body has multiple cover-side adjustment holes into which the insertion member can be inserted. The guide member has a plurality of guide-side adjustment holes into which the insertion member can be inserted, The insertion member is removably inserted into one of the cover-side adjustment holes selected from the plurality of cover-side adjustment holes and one of the guide-side adjustment holes selected from the plurality of guide-side adjustment holes. The grass cutting machine according to feature 4.

6. The guide member is detachable from the cover body. The cover body is mounted on the machine so as to be rotatable and adjustable in the vertical direction. When setting the cover body to the lower limit position, remove the guide member from the cover body. A grass cutting machine according to any one of claims 1 to 3.

7. It is equipped with a lifting assist means to assist in lifting the cover body. The grass cutting machine according to feature 6.

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