Agricultural machinery

Abstract

To provide a grass cutting machine that can be maintained more easily. [Solution] The grass cutting machine 1 comprises a machine body 2 connected to a tractor, a grass cutting workpiece 3 mounted on the machine body 2, and a power transmission means 15 for transmitting power to the grass cutting workpiece 3. The machine body 2 also has a rotating frame 111 that can rotate forward and backward about a rotational axis Z at the working position and the maintenance position. When the rotating frame 111 is rotated backward about the rotational axis Z from the working position to the maintenance position, the distance between the two pulleys 42 and 43 decreases.

Description

Technical Field

[0001] Embodiments of the present invention relate to agricultural work machines.

Background Art

[0002] Conventionally, for example, an agricultural work machine described in the following Patent Document 1 is known.

[0003] This conventional agricultural work machine includes, for example, a machine body connected to a tractor, a working body (working machine equipment) rotatably provided on the machine body, and power transmission means for transmitting power from an input shaft connected to the PTO shaft of the tractor via a joint to the working body. Further, the power transmission means has a first rotating body and a second rotating body spaced apart from each other and an endless body (for example, a belt or the like) stretched over both rotating bodies.

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 agricultural work machine, for example, when replacing the endless body of the power transmission means, the operator needs to attach and detach (attach and detach) the endless body to and from both rotating bodies while pulling the endless body manually, so the replacement work of the endless body is not easy and there is a problem of poor maintainability.

[0006] Therefore, one of the problems of the embodiments of the present invention is to provide an agricultural work machine capable of improving maintainability.

Means for Solving the Problems

[0007] An agricultural implement according to an embodiment of the present invention comprises a machine body having a rotatable frame that can rotate to a first position and a second position, a work body provided on the machine body, and a power transmission means for transmitting power to the work body, wherein the power transmission means comprises a first rotating body and a second rotating body, and an endless body stretched between the first rotating body and the second rotating body, and when the rotatable frame is rotated from the first position to the second position, the distance between the first rotating body and the second rotating body decreases.

[0008] Furthermore, an agricultural implement according to an embodiment of the present invention comprises a machine body having a rotating frame that can rotate in the front-rear direction to a first position and a second position, a work body provided on the machine body, and a power transmission means for transmitting power to the work body, wherein the power transmission means comprises a first rotating body and a second rotating body, and an endless body stretched between the first rotating body and the second rotating body, and when the rotating frame is rotated rearward from the first position to the second position, the distance between the first rotating body and the second rotating body decreases. [Effects of the Invention]

[0009] According to embodiments of the present invention, maintainability can be improved. [Brief explanation of the drawing]

[0010] [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] This is a partial front view of the same grass-cutting machine (including a partially enlarged view). [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]It is a sectional view taken along line B-B in FIG. 3. [Figure 9] It is a partial plan view of the above-mentioned grass cutting work machine (in a state where the turning frame is in the working position). [Figure 10] It is a partial plan view of the above-mentioned grass cutting work machine (in a state where the turning frame is in the maintenance position). [Figure 11] (a) is a side view of the moving member, and (b) is a plan view of the moving member. [Figure 12] (a) is a schematic view showing the distance between both pulleys in a state where the turning frame is in the working position, and (b) is a schematic view showing the distance between both pulleys in a state where the turning frame is in the maintenance position.

Mode for Carrying Out the Invention

[0011] One embodiment of the present invention will be described with reference to FIGS. 1 to 12.

[0012] Reference numeral 1 in the figure is a grass cutting work machine which is an agricultural work machine. This grass cutting work machine 1 is connected to the rear part of a tractor (not shown) which is, for example, a traveling vehicle, and performs a grass cutting work (a work of shredding grass) which is an agricultural work while moving forward (in the traveling direction) by the traveling of the tractor.

[0013] More specifically, the grass cutting work machine 1 is a relatively large straw chopper that is detachably connected to the three-point link part (agricultural work machine lifting support part) at the rear part of the tractor, and shreds grass to be cut (mainly, for example, wheat straws, green manures, etc.) while moving forward (in the traveling direction) by the forward traveling of the tractor.

[0014] As shown in FIGS. 1 to 3 etc., the grass cutting work machine 1 includes a machine body 2 detachably connected to the three-point link part (agricultural work machine lifting support part) at the rear part of the tractor, and a grass cutting work body 3 which is rotatably provided on this machine body 2 and performs a grass cutting work (agricultural work) while rotating in a predetermined rotation direction (up-cut direction) about a rotation center axis X in the left-right direction.

[0015] Further, the grass cutting machine 1 includes a fixed cutting body (cutting aid) 5 that cuts grasses such as wheat straw between the grass cutting working body 3, and a scattering prevention body 6 that prevents the scattering of scattered objects from the grass cutting working body 3 side forward. The scattered objects from the grass cutting working body 3 side are, for example, stones, earth and sand, cut grass (grass after being shredded), etc.

[0016] Furthermore, the grass cutting machine 1 is provided with a rear cover body 8 that is rotatably adjustable in the vertical direction around a shaft portion 7 in the left - right direction on the machine body 2 and covers the upper rear side of the grass cutting working body 3, and a guide body (a discharge guide body which is a deflector) 9 provided on the rear cover body 8 for guiding the grass after being shredded.

[0017] Also, the grass cutting machine 1 includes a gauge roller 11 provided on the machine body 2 so as to be rotatably adjustable in the vertical direction around a shaft portion 10 in the left - right direction, a scraper 12 provided on the gauge roller 11 and adjustable in angle, and a stand 13 provided on the machine body 2 and adjustable in the vertical position.

[0018] Furthermore, the grass cutting machine 1 includes an input shaft 14 located at the center in the left - right direction of the machine body 2 for inputting power from the tractor side, and power transmission means 15 for transmitting the power from this input shaft 14 (the rotational power input to the input shaft 14) to the rotary grass cutting working body 3.

[0019] The machine body 2 has a three - point connection portion 16 that is detachably connected (mounted) to the three - point link portion at the rear of the tractor. This three - point connection 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 link portion.

[0020] More specifically, the three - point connection portion 16 has, 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, etc.

[0021] The top mast 19, which holds the top pin 17, is mounted on the tip of the mast arm 20, whose base end is attached to the mast arm mounting plate 21, so as to be rotatable in the vertical direction around a left-right axis 28. Therefore, for example, when mowing grass in a field, the machine body 2 can tilt back and forth in accordance with the unevenness of the field surface to follow the contours. A joint hanger 29 for supporting the joint is attached to the stay 22, which is a reinforcing body of the mast arm 20.

[0022] The lower pin 18 is fixed to the left and right ends of the lower pin frame 23, which is detachably locked by the left and right hitch arms 25 and lever-equipped hooks 24. The hitch arms 25 are detachably attached to the hitch plate 26.

[0023] Furthermore, the machine body 2 has a transmission case section 32, which is a case-shaped input shaft holder that rotatably holds the input shaft 14, which is connected to the PTO shaft (power output shaft) at the rear of the tractor via a joint. A cylindrical frame pipe section 33, which is elongated in the left-right direction, is connected to the left side of the transmission case section 32 (left side when facing the direction of travel) and rotatably holds the transmission shaft 41 that transmits power from the input shaft 14. 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.

[0024] Furthermore, a power transmission means 15 is connected to the input shaft 14, which is a power input unit in the front-rear direction and is held by the transmission case 32 via bearings, to transmit the power input to the input shaft 14 (power from the tractor side) to the grass cutting work unit 3, which is the work unit.

[0025] The power transmission means 15 includes, for example, a transmission shaft 41 whose base end is connected to the input shaft 14 via a bevel gear and whose entire body is rotatably housed within the frame pipe portion 33; a drive-side pulley 42, which is a first rotating body attached to the outer circumference of the pulley shaft portion 41a at the tip of the transmission shaft 41; a driven-side pulley 43, which is a second rotating body spaced apart from the drive-side pulley 42; a belt 44, which is a plurality (for example, 5) of rotatable, endless bodies stretched between these two pulleys 42 and 43; and a tension adjustment mechanism 45 for adjusting the tension of the belt 44.

[0026] The power transmission belt 44 is, for example, a V-belt with a trapezoidal cross-section, and the belt transmission section 40 is composed of this belt 44 and the upper and lower pulleys 42 and 43. The lower driven pulley 43 is positioned behind the upper drive pulley 42.

[0027] The tension adjustment mechanism 45 consists of, for example, a tension pulley (a tension-applying body that contacts the belt 44 and applies tension to the belt 44) 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, 43, and the belt 44 are housed in a box-shaped pulley case 53, which is detachably attached to the left side plate portion 56 of the machine body 2.

[0028] Furthermore, when the tension pulley 46 is pressed against the belt 44 based on the biasing force of the compression spring 50, thereby applying the desired appropriate tension to the belt 44 (when the rotating frame 111, described later, is fixed to the working position by the fixing means 131), the upper and lower pulleys 42 and 43 are positioned parallel to each other, so no twisting occurs in the belt 44 stretched between the two pulleys 42 and 43 and the tension pulley 46.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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 based on power from the power transmission means 15. 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.

[0035] The rotating shaft 71 is a drive shaft that rotates in an up-cut direction about the rotational axis X by power from the power transmission means 15, 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.

[0036] A pulley shaft portion 78, which is a mounting shaft portion, 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 15 is attached to the outer circumference of this pulley shaft portion 78 (see Figure 3).

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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).

[0044] 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. In this grass cutting workpiece 3, the angle (circumferential angle difference) between the two adjacent tine mounting parts 73 in a side view with respect to the axial direction of the rotating shaft 71 is always within the range of 135 to 180 degrees (more than 135 degrees and less than or equal to 180 degrees).

[0045] 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.

[0046] 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.

[0047] Next, as shown in Figures 2, 3, 7 to 10, etc., the machine body 2 has a rotating frame 111 that can rotate in the front-rear direction to a working position (first position) and a maintenance position (second position) about a vertical pivot axis Z (a pivot point different from the axis of the input shaft) located near the input shaft 14 into which power is received from the tractor side.

[0048] In other words, the rotating frame 111 can rotate forward and backward by a predetermined angle α between the working position (a position for mowing grass) and the maintenance position (a position for maintenance), with respect to the vertical rotation axis Z located near the left-right center of the machine body 2.

[0049] The rotating frame 111 is composed of, for example, a transmission case section 32 and a frame pipe section 33. The predetermined angle α, which is the rotation angle of the rotating frame 111, is, for example, about 1 degree, and the corresponding movable amount a shown in Figure 8 is, for example, about 35 mm.

[0050] More specifically, as shown in Figures 3 and 7, the rotating frame 111 is rotatably attached in the front-rear direction to a frame mounting portion 113 provided on the right-side hitch plate 26 via a vertical frame rotation center axis 114. In other words, the inner end of the rotating frame 111 (the end on the rotation center side) is rotatably attached to the frame mounting portion 113 of the machine body 2 via the frame rotation center axis 114. The vertical rotation center axis Z is the line passing through the axis of the frame rotation center axis 114, which is the rotation center of the rotating frame 111.

[0051] The frame mounting section 113 has a base plate 115 fixed to the right-side hitch plate 26, and a mounting plate 116 is bolted to this base plate 115. A pair of upper and lower collar retaining plates 117 are fixed to the mounting plate 116, and a cylindrical collar 118 is fixedly held by both of these collar retaining plates 117.

[0052] The frame pivot axis 114 is rotatably inserted into the collar 118, and a nut 119 is screwed onto the threaded shaft portion 114a at its lower end. Meanwhile, a fixing plate 120 is fixed to the upper end of the frame pivot axis 114.

[0053] Furthermore, the frame pivot axis 114 is inserted through the shaft holes 122 of a pair of upper and lower shaft insertion plates 121 that protrude from the right side of the transmission case portion 32, and the fixing plate 120 is detachably attached to the upper shaft insertion plate 121 by mounting means 123. The mounting means 123 is, for example, a bolt 124 and a nut 125. The bolt 124 is inserted through the bolt hole 126 of the upper shaft insertion plate 121 and the bolt hole 127 of the fixing plate 120, and the nut 125 is screwed onto the inserted bolt 124. Alternatively, instead of the mounting means 123, a pin fixed to the fixing plate 120 may be inserted through the bolt hole 126 of the shaft insertion plate 121 to fix the fixing plate 120 to the shaft insertion plate 121.

[0054] On the other hand, as shown in Figures 8 to 10, the outer end of the rotating frame 111 (the end opposite to the pivot center) is rotatably inserted in the longitudinal direction along its longitudinal direction into an elongated hole 130 formed in the left side plate portion 56. In other words, the frame pipe portion 33 of the rotating frame 111 has a boss portion 33a at its outer end (left end), which is a cylindrical reinforcing holding portion that rotatably holds the transmission shaft 41 via a bearing, and this boss portion 33a is rotatably inserted into the elongated hole 130 of the left side plate portion 56.

[0055] Furthermore, the rotating frame 111 is always releasably fixed in a fixed working position (first position) by only the fixing means 131 located on the outer end side of the rotating frame 111 (the left side plate side).

[0056] The fixing means 131 includes a plate-shaped fixed member (positioning plate) 132 fixed to the left side plate portion 56 so as to protrude inward, a plate-shaped movable member (end plate) 133 that moves (slides) in the front-rear direction along the left side plate portion 56 in accordance with the front-rear rotation of the rotating frame 111, a fixing member 134 that fixes the movable member 133 to the fixed member 132 to releasably fix the rotating frame 111 to the working position, and a pair of upper and lower additional fixing members 135 that fix the movable member 133 to the left side plate portion 56 to releasably fix the rotating frame 111 to the working position.

[0057] The fixing member 134 is, for example, a bolt 136 and a nut 137, and the additional fixing member 135 is, for example, a bolt 138 and a nut 139. The movable member 133 is positioned along the left side plate portion 56 so as to cover the elongated hole 130 of the left side plate portion 56.

[0058] A bolt hole 141 is formed in the vertical center of the fixed member 132. A pair of bolt holes 142 are formed near the top and bottom of the elongated hole 130 in the left side plate portion 56.

[0059] The movable member 133 supports the outer end of the rotating frame 111 and is linked to the forward and backward rotation of the rotating frame 111. It has a movable plate portion 143 that covers the elongated hole 130 of the left side plate portion 56 and moves (slids) along the side plate portion 56 in the forward and backward direction, and a contact plate portion (bent plate portion) 144 that is connected to the front end of the movable plate portion 143 in a bent shape toward the direction away from the left side plate portion 56 and contacts the fixed member 132 in a planar manner so as to be able to move toward and away from it.

[0060] The movable plate portion 143 has an insertion hole 146 into which the boss portion 33a of the frame pipe portion 33 of the rotating frame 111 is fitted with a small gap (a gap to allow rotation of the rotating frame 111) 145. This insertion hole 146 is formed as a slightly elongated hole with its longitudinal direction in the front-rear direction. In other words, the front-rear length dimension L1 of the insertion hole 146 is slightly longer than the vertical length dimension L2 of the insertion hole 146 (see Figure 11(a)).

[0061] Furthermore, a pair of elongated bolt holes 147 are formed in the movable plate portion 143 near the top and bottom of the insertion hole 146, with each hole being parallel to the other and having a longitudinal shape in the front-to-back direction. Bolt holes 148 are formed in the contact plate portion 144, corresponding to the bolt holes 141 of the fixed member 132. The contact between this contact plate portion 144 and the fixed member (positioning portion) 132 ensures that the rotating frame 111 is always positioned at a constant working position.

[0062] Then, the bolt 136 of the fixing member 134 is inserted into the bolt hole 141 of the fixed member 132 and the bolt hole 148 of the contact plate portion 144 of the movable member 133, and a nut 137 is screwed onto the inserted bolt 136. In addition, the bolt 138 of the additional fixing member 135 is inserted into the bolt hole 142 of the left side plate portion 56 and the elongated bolt hole 147 of the movable plate portion 143 of the movable member 133, and a nut 139 is screwed onto the inserted bolt 138.

[0063] In this way, the rotating frame 111 is removably fixed to the working position solely by fixing the movable member 133 with the fixing member 134 and the additional fixing member 135 (tightening and fixing with bolts and nuts at three locations).

[0064] Here, Figure 9 is a partial plan view of the rotating frame 111 in the working position (normal position) (the frame pipe section 33 is positioned along the left-right direction), and in the state shown in Figure 9 (working state), the rotating frame 111 is fixed in the working position only by the fixing means 131.

[0065] And, as shown in FIG. 12(a) corresponding to this FIG. 9, in the state where the rotating frame 111 is located at the working position (fixed state by the fixing means 131), the distance b1 between both pulleys 42 and 43 is, for example, about 500 mm. Note that the distance b1 is the distance between the rotation center point P1 of the driving-side pulley 42 and the rotation center point P2 of the driven-side pulley 43 (the same applies to the distance b2 described later).

[0066] Also, in the state shown in FIG. 12(a), the belt 44 is loosened by adjusting the nut 52 of the tension adjusting mechanism 45, and in this state, the belt 44 is slightly loosened as indicated by the slack amount c1. Note that this slack amount c1 can be adjusted to an appropriate tension by adjusting the nut 52 of the tension adjusting mechanism 45.

[0067] On the other hand, FIG. 10 is a partial plan view in the state where the rotating frame 111 is located at the maintenance position (belt attachment / detachment position) by backward rotation about the rotation center axis Z of the rotating frame 111 (the state where the frame pipe portion 33 is inclined with respect to the left-right direction). In the state shown in this FIG. 10 (maintenance state), the nuts 137 and 139 are loosened and the fixing of the rotating frame 111 by the fixing means 131 is released.

[0068] And, as shown in FIG. 12(b) corresponding to this FIG. 10, in the state where the rotating frame 111 is located at the maintenance position, the distance b2 between both pulleys 42 and 43 is, for example, about 475 mm (b2 < b1). That is, in this way, when the rotating frame 111 is rotated backward about the vertical rotation center axis Z from the working position to the maintenance position, the distance between both pulleys 42 and 43 decreases.

[0069] Also, in the state shown in FIG. 12(b), due to the decrease in the distance between both pulleys 42 and 43 as indicated by the slack amount c2, the belt 44 is further loosened (c2 > c1). As a result, a gap 150 of a predetermined size is formed between the greatly loosened belt 44 and the lower driven-side pulley 43, making it easy to attach / detach (replace) the belt 44.

[0070] Next, we will explain the operation of the grass cutting machine 1.

[0071] 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 work body 3 perform grass cutting work while rotating at high speed in a predetermined up-cut direction about the rotation center axis X together with the rotation shaft 71 based on power from the power transmission means 15.

[0072] 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).

[0073] Here, we will explain a case where, for example, it becomes necessary to replace the belt 44 of the belt drive section 40 of the power transmission means 15 due to deterioration over time from prolonged use. When replacing the belt 44, the connection between the grass cutting machine 1 and the tractor is disconnected.

[0074] First, with the grass cutting machine 1 supported by the stand 13, the operator operates the nuts 137 and 139 of the fixing means 131 to release the fixing of the movable member 133 to the fixed member 132 and the side plate portion 56, and also operates the nut 52 of the tension adjustment mechanism 45 to loosen the tension of the belt 44 (see Figure 12(a)).

[0075] Next, the worker holds the frame pipe section 33 of the rotating frame 111 and rotates the rotating frame 111, together with the input shaft 14, transmission shaft 41, and drive-side pulley 42, etc., from the working position to the maintenance position around the rotation center axis Z.

[0076] As the rotating frame 111 rotates backward, the moving member 133 moves backward along the side plate portion 56, guided by the front-rear axis portion 136a of the bolt 136. In other words, the moving member 133 moves backward from a contact position where the contact plate portion 144 is in contact with the fixed member (contact receiving portion) 132, to a separated position where the contact plate portion 144 is separated from the fixed member (contact receiving portion) 132.

[0077] As a result, a predetermined maintenance state is reached as shown in Figure 10, where the driven pulley 43 does not rotate, and the drive pulley 42 rotates backward by a predetermined angle α together with the rotating frame 111. This reduces the distance between the drive pulley 42 and the driven pulley 43, causing the belt 44 to slacken under its own weight, and a predetermined gap 150 is formed between the belt 44 and the driven pulley 43 (see Figure 12(b)).

[0078] The worker then removes the belt 44 that needs replacing from both pulleys 42 and 43, and places a new belt 44 between the two pulleys 42 and 43. At this time, since a gap 150 of a predetermined size is formed, there is no need to manually pull the endless belt 44. Therefore, the worker can easily perform the belt replacement work.

[0079] After the belt 44 replacement is complete, the operator rotates the rotating frame 111 forward around the rotation axis Z back to its original working position. As a result, the moving member 133 moves forward along the side plate 56, guided by the shaft portion 136a of the bolt 136. Subsequently, the moving member 133 is fixed with the fixing means 131, and the tension of the belt 44 is adjusted with the tension adjustment mechanism 45, resulting in a proper working state for grass cutting.

[0080] Therefore, according to the above-described grass cutting machine 1, the machine body 2 has a rotating frame 111 that can rotate in the front-rear direction to a working position and a maintenance position about a vertical rotation axis Z, and when this rotating frame 111 is rotated backward about the vertical rotation axis Z from the working position to the maintenance position, the distance between the two pulleys 42 and 43 of the belt transmission section 40 of the power transmission means 15 is reduced, so the belt 44 can be easily attached and detached, for example when replacing the belt 44, and thus maintainability can be improved.

[0081] Furthermore, the rotating frame 111 can be easily and appropriately fixed to the working position solely by the fixing means 131 located on the outer end side of the rotating frame 111.

[0082] Furthermore, for example, during grass cutting work in fields, it is possible to prevent (suppress) the occurrence of problems such as the grass cutting tines 72 coming into contact with each other, 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.

[0083] Furthermore, the grass cutting machine (agricultural machine) is not limited to a configuration that does not allow grass cutting at an offset position. For example, it may be a configuration in which a grass cutting workpiece (workpiece) that can be adjusted left and right relative to the tractor can be set to a desired offset position to perform grass cutting.

[0084] Furthermore, the power transmission means for transmitting power to a workpiece such as a grass-cutting machine is not limited to a configuration having a belt transmission section consisting of a belt and pulleys, but may also be a configuration having a chain transmission section consisting of a chain and sprockets, and only needs to have at least a first rotating body, a second rotating body and an endless body.

[0085] Furthermore, the fixing members and additional fixing members in the fixing means for releasably fixing the rotating frame to the first position are not limited to bolts and nuts, but may also be fixed pins or the like.

[0086] Furthermore, agricultural machinery is not limited to grass cutting machines; it can also include rotary tillers, harrows, levee builders, etc., and is entirely optional. [Explanation of Symbols]

[0087] 1. Agricultural machinery, specifically a grass cutting machine. 2 units 3. Workpiece: Grass cutting workpiece 14 Input axes 15 Power transmission means 42 The first rotating body is the drive-side pulley 43 The second rotating body is the driven pulley 44. Endless Belt 56 Side plate part 111 Rotating Frame 130 long hole 131 Fixing means 132 Fixed member 133 Movable member 134 Fixing member b1, b2 Distance between the two solids of revolution Z-axis rotation center

Claims

1. A machine having a rotating frame that can rotate to a first position and a second position, A work body provided on the aforementioned machine, The workpiece is equipped with a power transmission means for transmitting power to the workpiece, The power transmission means is A first rotating body and a second rotating body, It comprises the first rotating body and the endless body stretched across the second rotating body, When the rotating frame is rotated from the first position to the second position, the distance between the first rotating body and the second rotating body decreases. A farming machine characterized by the following features.

2. An aircraft having a rotating frame that can rotate in the front-rear direction to a first position and a second position, A work body provided on the aforementioned machine, The workpiece is equipped with a power transmission means for transmitting power to the workpiece, The power transmission means is A first rotating body and a second rotating body, It comprises the first rotating body and the endless body stretched across the second rotating body, When the rotating frame is rotated backward from the first position to the second position, the distance between the first rotating body and the second rotating body decreases. A farming machine characterized by the following features.

3. The aircraft has side plates with elongated holes formed therein. The rotating frame is rotatable along the longitudinal direction of the elongated hole. The agricultural implement according to claim 1 or 2.

4. It includes a fixing means for fixing the rotating frame to a first position, The aforementioned fixing means is A fixing member provided on the side plate of the aircraft, A movable member that moves along the side plate portion in accordance with the rotation of the rotating frame, The movable member is fixed to the fixed member, thereby fixing the rotating frame to the first position. The agricultural implement according to claim 1 or 2.

5. The side plate of the aircraft has an elongated hole through which the outer end of the rotating frame is inserted. The movable member is positioned to cover the elongated hole. The agricultural implement according to feature 4.

6. The rotating frame is fixed to the first position only by fixing means located on the outer end side of the rotating frame. The agricultural implement according to claim 1 or 2.

7. The rotating frame is capable of rotating about a pivot axis located near the input shaft that receives power from the vehicle connecting the machine. The agricultural implement according to claim 1 or 2.

8. The workpiece is a grass-cutting workpiece that performs grass-cutting work while rotating based on power from a power transmission means. The agricultural implement according to claim 1 or 2.

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