Hammermoa

Abstract

To stabilize a travel route in a hammer mower.SOLUTION: A hammer mower 1 in which a mower working machine 3 in a farm is located in a front part of a travel part 2 is provided with a bounce prevention plate 35 which prevents a stone or the like bouncing forward during mowing operation of the working machine 3 from bounding and contacting an operator. The bounce prevention plate 35 is provided at a front end of a cutter cover 40. The hammer mower 1 is provided with a handle 17 gripped by the operator during travel or mowing operation. The bounce prevention plate 35 is provided with a travel guide 39. When the hammer mower 1 is traveled with the handle 17 gripped by the operator, the hammer mower 1 is traveled so that the travel guide 39 and a prescribed object in the farm match when seen by the operator, so that the travel route of the hammer mower 1 is stabilized.SELECTED DRAWING: Figure 29

Description

[Technical Field]

[0001] The present invention relates to a hammer mower for mowing grass. [Background technology]

[0002] BACKGROUND ART Conventionally, there is known a technique relating to a hammer mower in which a work implement for mowing a field is arranged at the front of a traveling section and which performs mowing work while traveling (see Patent Document 1).

[0003] The traveling section of the hammer mower includes a transmission case, an engine frame fixed to the transmission case, an engine mounted on the engine frame and serving as a power source for traveling and for the work implement, a traveling shaft mounted on the transmission case and driven by power transmitted from the engine, traveling wheels fixed to the traveling shaft, and a cutter cover covering the top of the work implement. The work implement of the hammer mower includes a cutter shaft mounted within the cutter cover and driven by power transmitted from the engine, with a plurality of cutter blades provided on the outer periphery of the cutter shaft. The hammer mower also includes a handle that is gripped by the operator when traveling or mowing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 3-78920 Summary of the Invention [Problem to be solved by the invention]

[0005] With the hammer mower, the operator must drive the implement while looking at the field and gripping the handle, and the hammer mower must then move to perform the mowing work. As a result, the hammer mower's travel path may become unstable.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hammer mower that can stabilize the travel path. [Means for solving the problem]

[0007] The problem to be solved by the present invention is as described above, and the means for solving this problem will now be described.

[0008] That is, in claim 1, a hammer mower is provided in which a work implement for mowing a field is disposed in front of a traveling part and performs mowing work while traveling, and the traveling part comprises a transmission case and a Rue an engine frame, an engine mounted on the engine frame and serving as a power source for traveling and working equipment; a traveling shaft that is mounted across the transmission case and driven by power transmitted from the engine; Run The working machine is equipped with a running wheel, a cutter cover that covers the top of the working machine, and a front wheel that is provided near the cutter cover, and the working machine has a cutter rotating shaft that is driven by power transmitted from the engine and is mounted horizontally within the cutter cover, and a plurality of cutter blades are provided on the outer surface of the cutter rotating shaft, and is equipped with a rebound prevention plate that prevents stones and the like that are bounced forward when the working machine is operating to perform grass cutting work from bouncing back and hitting the operator, the rebound prevention plate is provided at the front end of the cutter cover, and the hammer mower has a handle that is held by the operator when driving or performing grass cutting work, and the rebound prevention plate has a travel guide, and when the hammer mower is driven by the operator while holding the handle, the hammer mower is driven so that the travel guide is aligned with a specified object in the field as seen by the operator, thereby stabilizing the travel path of the hammer mower.

[0009] In claim 2, a height adjustment mechanism is provided that adjusts the height of the work machine by changing the height position of the front wheels and fixing the changed height position of the front wheels to increase or decrease the height of the work machine, the front wheels are arranged near the side of the cutter cover, and the height adjustment mechanism has an operating unit that is operated by the worker when adjusting the height of the work machine, and the operating unit of the height adjustment mechanism is arranged above the cutter cover.

[0010] In claim 3, the travel guide is provided at the upper end of the anti-rebound plate.

[0011] In claim 4, the hammer mower is provided with a side plate portion configured to take in grass just before it is cut by the work machine when mowing work is performed while the hammer mower is running, and the side plate portion is configured to extend outward to the side of the cutter cover at the front end of the cutter cover.

[0012] In claim 5, the side plate portion is disposed in front of the front wheel.

[0013] In claim 6, the cutter cover is provided with a protective plate that is positioned inside the cutter cover and prevents stones, grass, etc. that are kicked up when the work machine performs a grass-cutting operation from directly contacting the cutter cover.

[0014] In claim 7, the present invention provides a power take-off shaft that transmits power from the engine, the power take-off shaft being inserted into the belt cover and having a pulley provided therein, the cutter rotation shaft being inserted into the belt cover and having a pulley provided therein, a belt being wound between the pulley of the power take-off shaft and the pulley of the cutter rotation shaft within the belt cover, and the power from the engine being transmitted to the cutter rotation shaft, and a belt tensioning mechanism that applies tension to the belt that is placed within the belt cover and is configured to absorb impacts to the belt and vibrations of the belt, and the belt tensioning mechanism is a case fixed to the belt cover; The device is disposed in the case and configured to be movable along the axial direction of the case. , Kan It comprises a movable arm with a through hole, a biasing spring that biases the movable arm toward the belt, a support shaft that is inserted into the through hole of the movable arm, and a bearing that is inserted into and supported by the support shaft and is rotatable while in contact with the belt. [Effects of the Invention]

[0015] The present invention has the following effects. That is, according to the present invention, the travel path of the hammer mower can be stabilized. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing a hammer mower according to an embodiment of the present invention; [Figure 2] A front view of the same hammer mower. [Figure 3] A rear view of the same hammer mower. [Figure 4] A plan view of the same hammer mower. [Figure 5] A bottom view of the same hammer mower. [Figure 6] Left side view of the same hammer mower. [Figure 7]The right side also shows a hammer moa. [Figure 8] An enlarged side view of the front of the Hammermoa. [Figure 9] FIG. 10 is an enlarged side view showing the vicinity of the viewing window of the hammer mower. [Figure 10] FIG. 4 is an enlarged perspective view showing the vicinity of the running wheel of the hammer mower. [Figure 11] This is an enlarged view of the hammer mower with the running wheels disassembled from the running shaft. [Figure 12] FIG. 4 is a plan cross-sectional view showing the running shaft and running wheels of the hammer mower. [Figure 13] FIG. 4 is a front cross-sectional view showing the running shaft and running wheels of the hammer mower. [Figure 14] FIG. 4 is a plan cross-sectional view showing the running shaft and running wheels of the hammer mower. [Figure 15] FIG. 4 is a plan cross-sectional view showing the running shaft and running wheels of the hammer mower. [Figure 16] FIG. 4 is a plan cross-sectional view showing the running shaft and running wheels of the hammer mower. [Figure 17] FIG. 4 is an enlarged perspective view showing the vicinity of the running wheel of the hammer mower. [Figure 18] FIG. 4 is a plan cross-sectional view showing the running shaft and running wheels of the hammer mower. [Figure 19] (a) An enlarged perspective view of the rear of the hammer mower. (b) An enlarged perspective view of the rear of the hammer mower. [Figure 20] An enlarged perspective view of the front of the Hammermoa. [Figure 21] An enlarged side view of the front of the Hammermoa. [Figure 22] FIG. 10 is an enlarged plan view showing the operating portion of the height adjustment mechanism of the hammer mower. [Figure 23] FIG. 10 is an enlarged side view showing the hammer mower with the working implement positioned lowered. [Figure 24] FIG. 10 is an enlarged plan view showing the operating section of the hammer mower with the working implement positioned lowered. [Figure 25] FIG. 10 is an enlarged side view showing the hammer mower with the working implement positioned higher. [Figure 26] FIG. 10 is a side plan view showing the operating section of the hammer mower with the working implement positioned higher. [Figure 27] FIG. 10 is a front view showing the operating part of the height adjustment mechanism of the hammer mower. [Figure 28] FIG. 10 is a front view showing an operating part of a height adjustment mechanism of the hammer mower. [Figure 29] An enlarged front view of the same hammer mower. [Figure 30] An enlarged plan view of the same hammer mower. [Figure 31] FIG. 10 is an enlarged perspective view showing the inside of the cutter cover of the hammer mower. [Figure 32] FIG. 10 is an enlarged side cross-sectional view showing the inside of the cutter cover of the hammer mower. [Figure 33] An enlarged side view showing the inside of the belt cover of the hammer mower. [Figure 34] FIG. 10 is a front cross-sectional view showing the hammer mower belt cover and belt tension mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0017] Next, a hammer mower 1 according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 7, the hammer mower 1 is a walk-behind hammer mower having a traveling section 2 and a working implement 3, and is configured such that the working implement 3 for mowing grass in a farm field is disposed in front of the traveling section 2. The traveling unit 2 is configured to be able to travel in the forward and backward directions while an operator grips the handle 17. The traveling unit 2 includes a transmission case 4, an engine frame 5, an engine 6, a traveling axle 7, traveling wheels 8, the handle 17, a cutter cover 40, a front wheel 9, a belt cover 10, and a belt cover 11. The traveling unit 2 is fixed to a transmission case 4, and an engine frame 5 protrudes rearward from the transmission case 4. An engine 6 is mounted on the engine frame 5 and serves as a power source for traveling and for the work implement 3. A traveling shaft 7, which receives power from the engine 6 and is driven, is mounted horizontally below the transmission case 4, and traveling wheels 8, 8 are mounted on the traveling shaft 7. The work implement 3 is attached to the front of the transmission case 4. A speed change lever 20 is provided extending rearward and upward from the left side of the transmission case 4. A handle 17, which is held by the operator when traveling or mowing, is provided on the top of the transmission case 4 and extends rearward and upward. A traveling clutch lever 18, a working clutch lever 19, a reverse handle 21, etc. are arranged on the handle 17. The traveling of the hammer mower 1 can be controlled by the traveling clutch lever 18, the reverse handle 21, etc., and the operation of the work implement 3 (e.g., the rotational speed of the cutter rotation shaft 30) can be controlled by the working clutch lever 19. A cutter cover 40 is attached to the front end of the transmission case 4 via a mounting plate 32, a connecting plate 33, etc., and a pair of left and right front wheels 9, 9 are provided near both sides of the cutter cover 40. The front wheels 9 are in contact with the field below the work implement 3.

[0018] The work implement 3 mows grass in a field by winding up the grass when power is transmitted from the engine 6. As shown in FIG. The work machine 3 has a cutter rotation shaft 30 that is driven by power transmitted from the engine 6 and is installed inside the cutter cover 40 (below the cutter cover 40), and the bases of multiple cutter blades 31, 31, etc., which are Y-shaped when viewed from the front, are attached to the outer surface of the cutter rotation shaft 30 via stays. When the cutter rotating shaft 30 rotates at high speed, the cutter blades 31·31··· are able to protrude perpendicularly (radially) to the cutter rotating shaft 30 due to centrifugal force, thereby cutting grass.In the unlikely event that the cutter blades 31 come into contact with soil in the field or stones rolling on the surface of the field, they are configured to rotate around the axis of the stay to escape and prevent damage.

[0019] Next, the power transmission configuration from the engine 6 will be described. A power take-off shaft protrudes from the left side of the engine 6, and the power from the engine 6 is transmitted via the power take-off shaft to pulleys and belts inside the belt cover 10 located on the left side of the transmission case 4, and then transmitted to an input shaft that protrudes to the right from approximately the center of the front and rear of the belt cover 10 and is inserted into the transmission case 4, and then transmitted to the transmission case 4. In addition, power from the engine 6 is transmitted to pulleys, belts, etc. inside the belt cover 10 via the power take-off shaft of the engine 6, and is then transmitted to the power take-off shaft that protrudes to the right from the front of the belt cover 10 and is located inside the shaft cover 12. The power take-off shaft is inserted into the upper rear part of the belt cover 11, and a pulley 14 is provided at its protruding end (right end) inside the belt cover 11. The cutter rotation shaft 30 is inserted into the lower front part of the belt cover 11, and a pulley 15 is provided at its protruding end (right end) inside the belt cover 11. A belt 16 is wound between the pulleys 14 and 15. In this way, power from the engine 6 is transmitted to the power take-off shaft, then to the pulley and belt 16 inside the belt cover 11, and then to the cutter rotation shaft 30 (see Figure 33).

[0020] As shown in Figures 1 to 7, the cutter cover 40 comprises a main plate 41, a pair of left and right side plates 42, a bearing 43, and a shaft cover 44, and is configured to cover the upper side of the work machine 3 (the cutter rotation shaft 30 and cutter blade 31 of the work machine 3, etc.) and to be open at the lower side. The main plate 41 of the cutter cover 40 is formed by bending a flat metal member. The front portion of the main plate 41 is inclined downward from the front to the rear and is formed in an arc shape from the midpoint of the front to the rear in a side view. The pair of left and right side plates 42 of the cutter cover 40 are configured so that their upper edges are fixed and connected to the main plate 41. The pair of left and right side plates 42 rotatably support the cutter rotation shaft 30. Each of the pair of left and right side plates 42 has a through hole formed in the approximate center thereof, and a bearing 43 and other bearings are disposed in the through hole. The left and right ends of the cutter rotation shaft 30 are inserted into the bearings 43, etc., to rotatably support the cutter rotation shaft 30. The shaft cover 44 of the cutter cover 40 is disposed in the through hole of the left side plate 42, and is configured to cover the left end of the cutter rotation shaft 30 (see Figures 8 and 9).

[0021] As shown in FIG. 8 or 9, the cutter cover 40 includes a viewing window 45. The viewing window 45 is configured to allow an operator to visually check the state of rotation of the cutter rotation shaft 30 (cutter blade 31) from outside the cutter cover 40. The viewing window 45 is provided in the left side plate 42 of the cutter cover 40. The viewing window 45 is provided in the shaft cover 44 on the left side plate 42 of the cutter cover 40. The viewing window 45 is configured by being formed so as to penetrate the center of the shaft cover 44 in the left-right direction. A lid body 46, which is a disk-shaped member made of a transparent resin material, is provided over the viewing window 45.

[0022] As described above, the cutter cover 40 is provided with a viewing window 45 that allows the operator to visually check the state of the rotational movement of the cutter rotation shaft 30 from outside the cutter cover 40. Therefore, after turning the work lever OFF while the work machine 3 is performing a grass cutting operation, the operator can look at the state of the cutter rotation shaft 30 through the viewing window 45 and visually check from outside the cutter cover 40 whether the rotational movement of the cutter rotation shaft 30 (cutter blade 31) has stopped. Therefore, it is possible to improve the work efficiency and also to ensure safety.

[0023] Furthermore, as described above, since the viewing window 45 is provided in the shaft cover 44 (the center of the shaft cover 44) of the cutter cover 40, the operator can more reliably see the state of the rotational movement of the cutter rotation shaft 30 and more reliably recognize whether the rotational movement of the cutter rotation shaft 30 (cutter blade 31) has stopped.

[0024] A visual identification mark 47 is provided on the surface of the left end of the cutter rotation shaft 30. The visual identification mark 47 makes it easier for an operator to visually check the state of rotational movement of the cutter rotation shaft 30 through the viewing window 45. The visual identification mark 47 is colored in a color (e.g., yellow) that makes it easier for an operator to visually check the state of rotational movement of the cutter rotation shaft 30 through the viewing window 45. The visual identification mark 47 is configured in a linear shape and is provided at a position eccentric from the axis. The visual identification mark 47 is provided so as to extend radially from the axis.

[0025] As described above, since the visual mark 47 is provided on the surface of the left end of the cutter rotation shaft 30, the operator can more reliably visually confirm the state of the rotational movement of the cutter rotation shaft 30 by visually checking the rotation of the visual mark 47, and can more reliably recognize whether the rotational movement of the cutter rotation shaft 30 (cutter blade 31) has stopped.

[0026] Note that the viewing window 45 may not necessarily be provided with a lid 46. The lid 46 is not limited to being transparent and may be made of, for example, semi-transparent material, and may be made of, for example, glass material instead of resin material. The lid 46 may also be made of a magnifying glass that allows the operator to visually confirm the state of the rotational movement of the cutter rotation shaft 30 in a magnified manner. Furthermore, the visual identification mark 47 is not limited to being linear, but may be any shape that makes it easy to visually identify the state of rotational movement of the cutter rotation shaft 30, and may be, for example, a single or multiple circles or squares, or a spiral shape that is provided over the entire surface of the left end of the cutter rotation shaft 30.

[0027] As shown in Figures 10 to 13, the running wheel 8 is equipped with a wheel 23, and the running shaft 7 is inserted into the cylindrical portion 24 of the wheel 23, and a washer 25 and a fixing device 26 such as a screw are attached to the end of the running shaft 7, and the running wheel 8 is attached to the running shaft 7. The running wheels 8 are configured to be able to rotate freely (not rotate) relative to the running shaft 7 within a range of a predetermined rotation angle of the running shaft 7 when the running shaft 7 rotates. The running wheels 8 are configured to be able to be fixed to the running shaft 7 by fixing pins 54, which will be described later. The traveling shaft 7 has a plurality (three) of mounting holes 22 at each of its left and right ends (portions where the traveling wheels 8 are attached). The mounting holes 22 are arranged at predetermined intervals along the axial direction of the traveling shaft 7, and are configured so that the fixing pins 54 can be inserted therethrough. The number of mounting holes 22 is not limited to three, and two or four or more holes may be configured. The fixing pin 54 is used to fix and attach the contact member 50 or the running wheel 8, which will be described later, to the running shaft 7.

[0028] The running wheel 8 has a protrusion 27 on the wheel 23 . The protrusion 27 of the running wheel 8 is a cylindrical member that protrudes inward from the inner surface (the surface on the machine body side) of the wheel 23. The protrusion 27 of the running wheel 8 is disposed near the cylindrical portion 24 of the wheel 23.

[0029] The hammer mower 1 includes a contact member 50 on the traveling shaft 7 . The contact member 50 is attached to the traveling shaft 7. The contact member 50 includes a main body 51 and a pair of contact bodies 52, 52. The main body 51 of the abutting member 50 is cylindrical and configured to allow the traveling shaft 7 to be inserted therethrough. The main body 51 of the abutting member 50 has a pair of through holes 53 that penetrate in a direction perpendicular to the axial direction. The pair of through holes 53, 53 of the main body 51 of the abutting member 50 are arranged so as to be 180° out of phase with each other, and are configured to allow a fixing pin 54, which will be described later, to be inserted therethrough. The pair of abutment bodies 52 of the abutment member 50 are provided so as to protrude from the outer surface of the main body 51 in a direction perpendicular to the axial direction of the main body 51. The abutment body 52 of the abutment member 50 is disposed outside the through-hole 53 of the main body 51. The pair of abutment bodies 52 of the abutment member 50 are disposed so as to be 180° out of phase with each other. The abutment body 52 of the abutment member 50 is disposed so as to be 90° out of phase with the position where the through-hole 53 of the main body 51 is disposed. The contact body 52 of the contact member 50 is configured so as to be able to come into contact with the protrusion 27 of the running wheel 8 when the running shaft 7 rotates. The abutting bodies 52 of the abutting member 50 are not limited to being a pair and may be configured as a single body, for example, and the abutting bodies 52 of the abutting member 50 are not limited to being arranged so as to be shifted in phase by 90° from the location where the through-hole 53 of the main body 51 is arranged. The abutting bodies 52 of the abutting member 50 may also be configured to be provided so as to protrude from the outer surface of the main body 51 in the axial direction of the main body 51 (see FIG. 17 or 18).

[0030] The abutment member 50 is attached to the traveling shaft 7 by, for example, aligning the through hole 53 of the main body 51 with the innermost (machine body side) mounting hole 22 of the three mounting holes 22 of the traveling shaft 7, and then inserting the fixing pin 54 into the through hole 53 of the main body 51 and the mounting hole of the traveling shaft 7. At this time, a snap pin is provided on the fixing pin 54 to prevent it from falling out of the through hole 53 of the main body 51 and the mounting hole of the traveling shaft 7. The contact member 50 is configured to rotate together with the rotation of the traveling shaft 7 when attached to the traveling shaft 7 .

[0031] The running wheel 8 is attached to the running shaft 7 so that the wheel 23 is disposed outside the contact member 50 with the contact member 50 attached to the running shaft 7 as described above. With this configuration, the running wheel 8 is configured to rotate when the running shaft 7 rotates and the abutment body 52 of the abutment member 50 abuts against the protrusion 27 of the running wheel 8. Furthermore, the running wheel 8 is configured so that the abutment body 52 of the abutment member 50 does not abut against the protrusion 27 of the running wheel 8 in a range of a predetermined rotation angle (approximately 130° in this embodiment) of the running shaft 7 when the running shaft 7 rotates. In other words, the running wheel 8 is configured to spin freely (not rotate) with respect to the running wheel 8 in a range of approximately 130° (predetermined rotation angle) of the running shaft 7 when the running shaft 7 rotates.

[0032] As described above, the running wheel 8 is configured to be able to rotate freely (not rotate) relative to the running shaft 7 within a range of a predetermined rotation angle of the running shaft 7 when the running shaft 7 rotates, which makes it easy to perform turning operations in the hammer mower 1 and improves operability.

[0033] As described above, the running wheel 8 is provided with the protrusion 27 on the wheel 23, the abutment member 50 is configured to rotate together with the rotation of the running shaft 7 while attached to the running shaft 7, the abutment member 52 of the abutment member 50 is configured to be able to abut against the protrusion 27 of the running wheel 8 when the running shaft 7 rotates, the running wheel 8 is configured to rotate when the running shaft 7 rotates and the abutment member 52 of the abutment member 50 abuts against the protrusion 27 of the running wheel 8, and when the running shaft 7 rotates, within a predetermined rotation angle range of the running shaft 7, the abutment member 52 of the abutment member 50 does not abut against the protrusion 27 of the running wheel 8 but rotates freely relative to the running wheel 8, thereby making it possible to realize a simple configuration that allows the hammer mower 1 to easily perform turning operations.

[0034] The running wheel 8 is configured to be able to set either a state in which it spins freely relative to the running shaft 7 within a range of a predetermined rotation angle of the running shaft 7 when the running shaft 7 rotates, or a state in which it is fixed to the running shaft 7 and rotates together with the running shaft 7 when the running shaft 7 rotates. The following describes a setting in which the running wheels 8 rotate together with the running shaft 7 when the running shaft 7 rotates. 14, the cylindrical portion 24 of the outer wheel 23 of the running wheel 8 has a pair of through holes 28 that penetrate in a direction perpendicular to the axial direction. The pair of through holes 28, 28 in the cylindrical portion 24 of the outer wheel 23 of the running wheel 8 are arranged so as to be 180° out of phase with each other, and are configured so that a fixing pin 54 can be inserted therethrough. The fixing pin 54 attaching the abutment member 50 to the running axle 7 is removed, and the through hole 28 of the wheel 23 of the running wheel 8 is aligned with the outermost (opposite the machine body) of the three mounting holes 22 of the running axle 7. Then, the removed fixing pin 54 is inserted through the through hole 28 of the wheel 23 of the running wheel 8 and the mounting hole of the running axle 7, thereby fixing the running wheel 8 to the running axle 7. At this time, a snap pin is provided on the fixing pin 54 to prevent it from falling out of the through hole 28 of the wheel 23 and the mounting hole of the running axle 7. At this time, the abutment member 50 may be positioned inside the running wheel 8 with the running axle 7 inserted therethrough, or it may be removed from the running axle 7. When attached to the traveling shaft 7 in this manner, the traveling wheels 8 are configured to rotate together with the traveling shaft 7 when the traveling shaft 7 rotates. In this configuration, the traveling wheels 8 are configured to rotate together with the traveling shaft 7 when the traveling shaft 7 rotates, which can improve operability, for example, when traveling from a flat field to a downhill slope.

[0035] As described above, the running wheels 8 can be set to either spin freely relative to the running axle 7 within a predetermined rotation angle range of the running axle 7 when the running axle 7 rotates, or rotate together with the running axle 7 when the running axle 7 rotates. This allows the setting to be changed depending on the situation, allowing the vehicle to travel in a state with improved operability.

[0036] The running wheels 8 are configured to rotate together with the running shaft 7 when the running shaft 7 rotates, and are configured so that their positions can be set to either the outside or the inside. The running wheels 8 will be described as being arranged on the inside. 15 , the running wheel 8 can be fixed to the running axle 7 by inserting a fixing pin 54 into the through hole 28 of the wheel 23 of the running wheel 8 and the fixing hole of the running axle 7 with the through hole 28 of the wheel 23 of the running wheel 8 aligned with the central fixing hole 22 of the three fixing holes 22 of the running axle 7. At this time, a snap pin is provided on the fixing pin 54 to prevent it from falling out of the through hole 28 of the wheel 23 and the fixing hole of the running axle 7. At this time, the abutting member 50 may be disposed inside the running wheel 8 with the running axle 7 inserted therethrough, or it may be removed from the running axle 7. 16, the running wheel 8 can also be fixed to the running axle 7 by inserting a fixing pin 54 into the through hole 28 of the wheel 23 of the running wheel 8 and the fixing hole of the running axle 7 with the through hole 28 of the wheel 23 of the running wheel 8 aligned with the innermost fixing hole 22 of the three fixing holes 22 of the running axle 7. At this time, a snap pin is provided on the fixing pin 54 to prevent it from falling out of the through hole 28 of the wheel 23 and the fixing hole of the running axle 7. At this time, the abutting member 50 may be disposed on the running axle 7 on the outside of the running wheel 8 with the running axle 7 inserted therethrough, or it may be removed from the running axle 7. By fixing the running wheel 8 to the running axle 7 in this manner, the running wheel 8 is positioned inward (towards the machine body) from the position of the running wheel 8 when the fixing pin 54 is inserted through the through hole 28 of the wheel 23 of the running wheel 8 and the outermost mounting hole 22 of the three mounting holes 22 of the running axle 7. By arranging the running wheels 8 in this manner, the hammer mower 1 can be turned relatively easily, and operability can be improved relatively.

[0037] It is also possible to provide two fixing pins 54, and with the abutment member 50 attached to the running shaft 7 by one of the fixing pins 54, inserting the other fixing pin 54 through the through hole 28 of the wheel 23 of the running wheel 8 and the mounting hole 22 of the running shaft 7, thereby fixing the running wheel 8 to the running shaft 7.

[0038] As shown in FIG. 19( a ), the hammer mower 1 includes a pin arrangement portion 29 . The pin arrangement portion 29 is configured so that a fixing pin 54 can be arranged therein. The pin arrangement portion 29 is configured as a through-hole formed in a flat metal member that is provided at the rear end portion of the engine frame 5 (the rear end portion of the aircraft) and that is inclined from front-upper to rear-lower. The through-hole is configured so that the body portion of the fixing pin 54 can be inserted through it, and has a diameter smaller than that of the head portion of the fixing pin 54. A pair of pin arrangement portions 29 is formed on the left and right. When a fixing pin 54 is not used to fix the running wheel 8 or the abutment member 50 to the running shaft 7, the fixing pin 54 not used to fix the running shaft 7 can be inserted into the pin arrangement section 29 with its head facing upward, whereby the head of the fixing pin 54 is caught and held, and the fixing pin 54 is arranged in the pin arrangement section 29. Alternatively, a snap pin can be provided on the fixing pin 54 with its head facing downward and its body inserted into the pin arrangement section 29, whereby the fixing pin 54 is arranged in the pin arrangement section 29 with the snap pin caught.

[0039] As described above, since the pin arrangement section 29 is provided, for example, an unused fixing pin 54 (one of the two fixing pins 54) can be arranged in the pin arrangement section 29, thereby preventing the fixing pin 54 from being lost. 19(b), the pin arrangement portion 29 is configured to be able to arrange a fixing pin 54. The pin arrangement portion 29 can also be configured to be arranged in front of a flat plate-shaped member that is inclined front-upper and rear-lower at the rear end portion of the engine frame 5 (at the rear end portion of the engine frame 5).

[0040] Handle 17 is configured to be roughly U-shaped in plan view by bending a single, roughly round rod-shaped member. The rear portion of handle 17 (the bottom portion configured to be roughly U-shaped) is configured as a part that is gripped by the operator when traveling or mowing. The work clutch lever 19 controls the mowing operation of the work machine 3 and is provided on the left side of the handle 17.

[0041] The travel clutch lever 18 is used to operate the hammer mower 1 to travel or stop (turn on / off the travel). As shown in FIGS. 1 to 7 , the travel clutch lever 18 is configured to be roughly W-shaped in a plan view, with a rod-like member curved to fit the shape of the rear portion of the handle 17. The travel clutch lever 18 is located at the rear portion of the handle 17 near the portion that is gripped by the operator when traveling or mowing. The travel clutch lever 18 is configured to extend from the left to the right portion of the handle 17. The travel clutch lever 18 is attached to the handle 17 so as to be rotatable up and down around its front end as a pivot point. The travel clutch lever 18 is configured to be biased upward. When the travel clutch lever 18 is in the upper position, the travel clutch lever 18 is in the OFF state, and the hammer mower 1 is stopped from traveling. When the travel clutch lever 18 is rotated downward to the lower position, the travel clutch lever 18 is in the ON state, and the hammer mower 1 travels.

[0042] The back handle 21 is located in the center of the left and right rear of the handle 17. The back handle 21 is operated when the lever is in the ON state to switch the hammer mower 1 between forward and reverse, and is configured to be OFF when the operator is not gripping the back handle 21 and ON when the operator is gripping the back handle 21. When the travel lever is in the ON state, the hammer mower 1 travels forward when the back handle 21 is in the OFF state (when the back handle 21 is not gripped), and travels backward when the back handle 21 is in the ON state (when the back handle 21 is gripped).

[0043] As described above, the hammer mower 1 is provided with the reverse handle 21, which is operated when the travel clutch lever 18 is in the ON state to switch between forward and reverse travel, and the reverse handle 21 is located on the handle 17 (in the center of the left and right rear of the handle 17). Therefore, compared to the conventional configuration (in which, when backing up is desired, the travel operation is stopped, the gear handle is used to switch to reverse gear, and then the travel clutch lever 18 is turned ON to travel up), switching from forward to reverse travel can be performed more smoothly, thereby improving operability and workability. The rear handle 21 is not limited to being disposed in the center of the left and right rear of the handle 17, but can be disposed at any suitable position on the handle 17 depending on the specifications, etc.

[0044] The travel clutch lever 18 is configured so that the center portion (corresponding to the portion where the back handle 21 is located) is concave, allowing the operator to place their hand in the concave portion. This configuration allows the operator to turn the travel clutch lever 18 up and down (to turn travel on and off) while operating the back handle 21, improving operability and workability.

[0045] As shown in FIGS. 20 and 21, a height adjustment mechanism 60 is provided to adjust the height of the work implement 3 (cutter blade 31) higher or lower relative to the field. The height adjustment mechanism 60 is configured so that the front wheels 9 can rotate around the axis of the cutter rotation shaft 30, and is configured to adjust the height of the work implement 3 by changing the rotational position of the front wheels 9 to change the height position of the front wheels 9, and by fixing the changed height position of the front wheels 9, thereby raising or lowering the height of the work implement 3. The height adjustment mechanism 60 includes a rotating part 61 and an operating part 62 .

[0046] The rotating part 61 of the height adjustment mechanism 60 supports the front wheel 9 near the side of the cutter cover 40 and is configured to be rotatable around the axis of the cutter rotation shaft 30. The rotating part 61 supports the front wheel 9 so that it is located forward of the cutter rotation shaft 30. The operating unit 62 is operated by the worker when adjusting the height of the work implement 3. The operating unit 62 is configured so that, when operated by the worker, it rotates the rotating unit 61 to change the height position of the front wheels 9 and also fixes the rotated position of the rotating unit 61 (the changed height position of the front wheels 9). The operating unit 62 is located above the cutter cover 40 on the right side of the machine body and to the rear of the cutter rotation shaft 30 (on the opposite side of the front wheels 9 across the cutter rotation shaft 30). The operating unit 62 is located to the right of the transmission case 4, in front of the engine 6, above and in front of the left running wheel 8, and in the space above (above and behind) the cutter cover 40.

[0047] In this way, the front wheels 9 are positioned near the sides of the cutter cover 30, and the operating part 62 of the height adjustment mechanism 60 is positioned above the cutter cover 30, so that the front wheels 9 do not protrude forward of the cutter cover 30, and the operating part 62 of the height adjustment mechanism 60 does not protrude forward or to the side of the machine body. Therefore, even though the machine has the function of changing the height position of the work implement 3 (cutter blade 31), the machine body can be prevented from becoming large and can be configured compactly, making it relatively easy to mow grass in narrow spaces or around fields, for example. Furthermore, since the operating part 62 of the height adjustment mechanism 60 is arranged in the space to the right of the transmission case 4, in front of the engine 6, in front and above the left running wheel 8, and above (above and behind) the cutter cover 40, by arranging the operating part 62 in a conventional space, even though it has the function of changing the height position of the work implement 3 (cutter blade 31), the machine body can be prevented from becoming large and can be configured compactly. In this way, the rotating part 61 supports the front wheel 9 near the side of the cutter cover 30 and is configured to be rotatable around the axis of the cutter rotation shaft 30, and the operating part 62 is operated by the worker to rotate the rotating part 61 and change the height position of the front wheel 9, and since the rotation position of the rotating part 61 is fixed, the task of changing the height position of the work machine 3 (cutter blade 31) can be made easier.

[0048] The rotation portion 61 of the height adjustment mechanism 60 includes a pair of left and right support members 63 and a connecting member 64 .

[0049] A pair of left and right support members 63, 63 of the rotating part 61 of the height adjustment mechanism 60 are supported by left and right bearings 43, respectively, and are configured to be rotatable around the axis of the cutter rotation shaft 30. The support members 63 are flat metal members arranged outside the side plates 42 of the cutter cover 40 so as to be inclined front-lower and rear-upper. The lower part (front lower end) of the support member 63 is located near the lower end of the side plate 42 of the cutter cover 40, and the upper part (rear upper end) of the support member 63 is located near the lower end of the side plate 42 of the cutter cover 40. A through hole is formed in the lower part (front lower end) of the support member 63, and the rotating shaft of the front wheel 9 is inserted into the through hole, so that the support member 63 supports the front wheel 9 at one end (lower part). The upper part (rear upper end) of the support member 63 is fixed to a connecting member 64, and the other end (upper part) of the support member 63 is connected to the connecting member 64.

[0050] The connecting member 64 of the rotating part 61 of the height adjustment mechanism 60 is a metal flat rod-shaped member with the left-right direction as the longitudinal direction, and is configured so that the left and right ends each protrude downward (toward the front and downward). The connecting member 64 has a pair of protrusions 65, 65 that protrude upward (toward the rear and upward) on the left side of the middle part (upper part) of the left and right sides. The protrusions 65 of the connecting member 64 rotatably support an arm 66 of the operating part 62, which will be described later. The connecting member 64 is disposed so that its left and right middle portions (upper portions) are located above the main plate 41 of the cutter cover 40 and its left and right ends are located outside the side plates 42 of the cutter cover 40. The connecting member 64 is disposed on the opposite side of the front wheel 9 with respect to the cutter rotation shaft 30. The connecting member 64 is fixed at its left and right ends to the upper portions of the pair of left and right support members 63, 63 by fasteners such as bolts, thereby connecting the pair of support members 63, 63.

[0051] The rotating unit 61 configured in this manner is configured so that the rotational position of the front wheels 9 and the rotational position of the connecting member 64 are changed by the support member 63 rotating around the axis of the cutter rotation shaft 30. The rotating unit 61 is configured so that when the front wheels 9 rotate upward by the rotation of the support member 63, the connecting member 64 rotates downward, and when the front wheels 9 rotate downward, the connecting member 64 rotates upward. Then, by setting the rotational position of the front wheels 9 to an upward position (the rotational position of the connecting member 64 to a downward position), the cutter rotation shaft 30 moves so as to be pushed downward, and the work implement 3 (cutter blade 31) approaches the field, thereby lowering the height of the work implement 3 (cutter blade 31) (see Figure 23 or Figure 24). In addition, by setting the rotation position of the front wheel 9 downward (the rotation position of the connecting member 64 upward), the cutter rotation shaft 30 moves in a manner that it is pushed downward, and the working implement 3 (cutter blade 31) moves away from the field, thereby increasing the height of the working implement 3 (cutter blade 31) (see Figure 25 or Figure 26).

[0052] The operating part 62 of the height adjustment mechanism 60 includes an arm 66, an operating handle 67, a shaft 68, a cylindrical body 69, a support 70, a pair of upper and lower spring holders 71, a biasing member 72, an insert 73, and a plurality of notches 74.

[0053] The shaft 68 of the operating unit 62 of the height adjustment mechanism 60 is arranged to span a pair of left and right protrusions 65, 65 of the connecting member 64 of the rotating unit 61. The arm 66 of the operating unit 62 is a flat rod-shaped member made of metal with the left-right direction as the longitudinal direction, and is configured to be approximately L-shaped in a front view with the right part protruding upward. An operating handle 67 is provided on the upward protruding part of the arm 66 of the operating unit 62. The cylindrical body 69 of the operating unit 62 is fixed to the upper surface of the bent part of the arm 66 when it protrudes upward. The shaft 68 is inserted into the cylindrical body 69 of the operating unit 62, configuring the arm 66 to be rotatable up and down.

[0054] A through hole is formed between the bent portion and the left end of the arm 66 of the operating portion 62 of the height adjustment mechanism 60 (on the left side of the arm 66). The support 70 of the operating unit 62 is fixed to the upper surface of the connecting member 64 so as to extend upward from the upper surface of the connecting member 64 while being inserted into the through hole of the arm 66, and is inserted into the through hole of the arm 66. The spring bearing 71 of the operating unit 62 is a flat, disk-shaped metal member with a through-hole formed in the center. The upper spring bearing 71 of the operating unit 62 is fixed to the upper end of the support post 70 with the support post 70 inserted into the through-hole. The lower spring bearing 71 is fixed to the upper surface of the arm 66 with the support post 70 inserted into the through-hole. The biasing member 72 of the operating portion 62 is made up of a coil spring. The biasing member 72 is disposed between a pair of spring receivers 71, 71, and biases the spring receivers 71, thereby biasing the left portion of the arm 66 downward. The insert 73 of the operating unit 62 is a flat, disk-shaped metal member that is fixed to the left end of the arm 66 so as to protrude downward from the underside of the arm 66. The insert 73 is configured to be able to be inserted into the notch 74.

[0055] The notch 74 of the operating portion 62 of the height adjustment mechanism 60 is formed in the mounting plate 32 and is disposed above the main plate 41 of the cutter cover 40 . Here, the mounting plate 32 is formed by bending a flat metal member, and is configured to be roughly U-shaped in side view. The front and rear ends of the mounting plate 32 are fixed to the main plate 41 of the cutter cover 40 with fasteners such as bolts, and the mounting plate 32 is positioned above the cutter cover 40. Furthermore, a pair of left and right connecting plates 33, 33 are connected to the upper surface of the mounting plate 32 so as to protrude upward, and the upper part of the connecting plate 33 is fixed to the transmission case 4 with fasteners such as bolts, and the cutter cover 40 is provided on the transmission case 4 via the mounting plate 32 and the connecting plate 33. The portion where the connecting plate 33 is connected to the mounting plate 32 is located slightly inside the left and right ends of the mounting plate 32, and the left and right edges are configured to protrude left or right. The notch 74 of the operating portion 62 is configured to cut out the right edge portion of the midpoint between the front and rear of the mounting plate 32. The notch 74 is configured to allow insertion of the fitting insert 73. A plurality of notches 74 (six in this embodiment) are formed at predetermined intervals in the front-rear direction, and an operator is configured to select one of the plurality of notches 74 to insert the fitting insert 73 into.

[0056] Next, the operation of adjusting the height of the work implement 3 (cutter blade 31) in the height adjustment mechanism 60 will be described. When the insert 73 is inserted into one of the multiple notches 74 of the operating part 62 of the height adjustment mechanism 60 selected by the operator, the rotational positions of the support member 63, connecting member 64, and front wheel 9 of the rotating part 61 are fixed (see Figure 21 or Figure 22). In this state, the operator rotates the operating handle 67 of the operating unit 62 downward (downward and to the right) to rotate the arm 66, thereby pulling the insert 73 upward and out of the notch 74 (see Figure 27 or Figure 28). Then, with the insert 73 pulled upward and removed from the notch 74 of the operating part 62, the operator moves the operating handle 67 of the operating part 62 forward (upper front) or rearward (lower rear) to change the rotational position of the connecting member 64 and the rotational position of the front wheel 9, thereby adjusting the height of the work implement 3 (cutter blade 31). Furthermore, with the rotational position of the connecting member 64 and the rotational position of the front wheel 9 changed, the insert 73 is inserted into one notch 74 selected by the operator from among the plurality of notches 74, and the rotational positions of the support member 63 of the rotating unit 61, the connecting member 64, and the front wheel 9 are fixed, and the state in which the height of the working machine 3 (cutter blade 31) has been changed is fixed. When the operator releases the operating handle 67 of the operating unit 62, the left part of the arm 66 is urged downward by the urging force of the urging member 72, and the state in which the insert 73 is inserted into the notch 74 is maintained.

[0057] The number of notches 74 in the operating portion 62 of the height adjustment mechanism 60 is not limited to six, and the number can be set appropriately depending on the specifications, applications, and the like. Furthermore, the operating unit 62 is not limited to being disposed on the right side of the machine body, but may also be configured to be disposed on the left side of the machine body.

[0058] As described above, the support member 63 of the rotating part 61 of the height adjustment mechanism 60 is supported by the bearing 43 and is configured to be rotatable around the axis of the cutter rotation shaft 30, supports the front wheel 9 at one end, and is connected at the other end (upper part) to the connecting member 64.As the support member 63 rotates around the axis of the cutter rotation shaft 30, the rotational position of the front wheel 9 and the rotational position of the connecting member 64 are changed, and therefore, a simple configuration can be achieved that makes it easier to change the height position of the work machine 3 (cutter blade 31).

[0059] As described above, when the insert 73 is inserted into one of the multiple notches 74 of the operating part 62 of the height adjustment mechanism 60 selected by the operator, the rotational positions of the support member 63, connecting member 64, and front wheel 9 of the rotating part 61 are fixed, and when the operating handle 67 is operated to rotate the arm 66 and pull the insert 73 out of the notch 74, the operator can operate and move the operating handle 67 of the operating part 62 to change the rotational position of the connecting member 64 and the rotational position of the front wheel 9, thereby adjusting the height of the work implement 3 (cutter blade 31).This makes it possible to simplify the task of changing the height position of the work implement 3 (cutter blade 31), with a simple configuration.

[0060] As shown in FIGS. 1 and 2 or 4 to 8, the hammer mower 1 includes an anti-rebound plate 35. The bounce prevention plate 35 prevents stones and the like that bounce forward from hitting a wall or the like and striking the worker when the work machine 3 is performing a grass cutting operation. The anti-rebound plate 35 is formed by bending a flat metal member. The anti-rebound plate 35 has a lower portion 36 that extends in the vertical direction and an upper portion 37 that is inclined front-upper, rear-lower, and downward, forming a generally V-shape in side view. The bounce prevention plate 35 is provided at the front end of the cutter cover 40. The bounce prevention plate 35 is configured such that a lower portion 36 is attached to the front end of the main plate 41 of the cutter cover 40 with fasteners such as screws, and an upper portion 37 extends forward and upward from the front end of the main plate 41 of the cutter cover 40. The lower portion 36 of the bounce prevention plate 35 is configured to prevent stones and the like that bounce back when the work implement 3 is operating in a grass-cutting operation from directly hitting the machine body, a worker, etc. The upper portion 37 of the bounce prevention plate 35 is configured to prevent stones and the like that bounce back when the work implement 3 is operating in a grass-cutting operation from directly hitting the machine body, a worker, etc., and to push down grass forward just before it is cut by the work implement 3. The upper end of the upper portion 37 of the bounce prevention plate 35 is located at the very front of the machine body.

[0061] As described above, since the anti-bounce plate 35 is provided at the front end of the cutter cover 40, it is possible to more reliably prevent rebounded stones and the like from hitting the worker when the work machine 3 is operating to cut grass.

[0062] The bounce prevention plate 35 includes a pair of left and right side plate portions 38. The side plate portions 38 of the rebound prevention plate 35 are configured to capture grass inward just before it is cut by the work implement 3 when the hammer mower 1 is traveling to perform grass cutting work. The pair of left and right side plate portions 38 of the rebound prevention plate 35 are connected to the lower portion 36 of the rebound prevention plate 35. The pair of left and right side plate portions 38 of the rebound prevention plate 35 are configured to extend left or right from the left and right ends of the lower portion 36 of the rebound prevention plate 35 and to extend outward from the left and right sides of the cutter cover 40. The side plate portions 38 of the rebound prevention plate 35 are configured to incline outward, frontward, inward, and rearward. By configuring the bounce prevention plate 35 (side plate portion 38 of the bounce prevention plate 35) in this manner, it is possible to form an integrated unit that has the function of preventing stones and the like that bounce back from hitting the worker when the work machine 3 is operating to cut grass, as well as the function of collecting grass, thereby reducing the number of parts.

[0063] In addition, the side plate portion 38 of the anti-rebound plate 35 is disposed in front of the front wheel 9. Therefore, when the hammer mower 1 is traveling and performing grass cutting work, it is possible to prevent the cut grass from getting tangled around the front wheel 9.

[0064] As shown in FIGS. 29 and 30, the anti-rebound plate 35 may be configured to have a travel guide 39 on its upper portion 37. When the hammer mower 1 is driven by an operator holding the handle 17, the travel guide 39 of the bounce prevention plate 35 causes the hammer mower 1 to travel so that the travel guide 39 is aligned with a specified object in the field as seen by the operator, thereby generally stabilizing the travel path of the hammer mower 1. The travel guide 39 of the anti-rebound plate 35 is arranged in a position that is visible to the operator when the operator is gripping the handle 17. The travel guide 39 of the anti-rebound plate 35 is provided at the upper end of the upper part 37 (the front end of the machine body). The travel guide 39 of the anti-rebound plate 35 is arranged near each of the left and right ends of the upper part 37. The travel guide 39 of the anti-rebound plate 35 is arranged closer to the center than the side plate parts 38. The travel guide 39 of the anti-rebound plate 35 is configured so that the upper end of the upper part 37 is cut out in an arc shape. Because of this configuration, for example, by running the hammer mower 1 so that the boundary (a specified object) between the area where grass has been cut and the area where grass has not been cut and the running guide 39 of the bounce prevention plate 35 are aligned as seen by the operator, the running path of the hammer mower 1 can be generally stabilized, and it is possible to prevent grass from being left uncut at the boundary between the area where grass has been cut and the area where grass has not been cut when grass cutting work is performed with the work machine 3. The travel guide 39 of the anti-rebound plate 35 is not limited to being an arc-shaped notch, but can also be configured, for example, with an angular notch or a protrusion, or by providing a triangular mark on the rear upper surface of the upper portion 37.

[0065] As shown in Figures 31 and 32, the cutter cover 40 is provided with a protective plate 48. The protective plate 48 is made of a flat metal member. The protective plate 48 is arranged inside the cutter cover 40 and prevents stones, grass, etc. that are kicked up when the work implement 3 performs a grass cutting operation from directly contacting the cutter cover 40 (the inside of the cutter cover 40). The protective plate 48 is arranged inside the front part of the main plate 41 of the cutter cover 40 (an area where a relatively large amount of stones, etc. are kicked up when the work implement 3 performs a grass cutting operation).

[0066] As described above, the cutter cover 40 is provided with the protective plate 48 that prevents stones and the like that are kicked up when the work machine 3 performs a grass cutting operation from directly hitting the cutter cover 40, and therefore it is possible to prevent the cutter cover 41 from being damaged (for example, dents being formed) by contact with kicked up stones and the like. Therefore, it is possible to reduce the frequency of replacing the cutter cover 40 due to damage, and to reduce the cost of replacing the cutter cover 40.

[0067] Furthermore, since the cutter cover 40 includes the protective plate 48, the thickness of the cutter cover 40 can be made thinner, thereby reducing the strength of the cutter cover 40 itself, compared to a cutter cover that does not include the protective plate 48. When the cutter cover 40 is made thinner in this way, the weight of the cutter cover 40 can be reduced, and the operability of the hammer mower 1, such as when turning, can be improved. Moreover, the thickness of the protective plate 48 of the cutter cover 40 can be increased to increase the weight of the cutter cover 40. When the protective plate 48 is configured to be thick in this way, the protective plate 48 can also function as a weight.

[0068] The protective plate 48 is attached to the cutter cover 40 (the main plate 41 of the cutter cover 40) with fasteners such as screws, and is configured to be detachable. With this configuration, a damaged protective plate 48 can be easily replaced. Furthermore, the protective plate 48 is provided on the cutter cover 40 via a spacer 49. The protective plate 48 is provided on the cutter cover 40 so that there is a slight gap (for example, a gap of 5 mm) between the protective plate 48 (the front upper surface of the protective plate 48) and the main plate 41 (the rear lower surface of the main plate 41) of the cutter cover 40. With this configuration, even if a dent or the like is formed in the protective plate 48 by a stone or the like kicked up when the work machine 3 performs a grass cutting operation, it is possible to prevent the dent or the like in the protective plate 48 from damaging the main plate 41 of the cutter cover 40.

[0069] As shown in FIGS. 33 and 34, the belt cover 11 includes a belt tension mechanism 80. As shown in FIG. The belt tension mechanism 80 of the belt cover 11 is configured to apply tension to the belt 16 placed inside the belt cover 11 and to absorb shocks to the belt 16 and vibrations of the belt 16. The belt tension mechanism 80 applies tension to the belt 16 by urging the rear part of the belt 16 between the pulley 14 (power take-off shaft) and the pulley 15 (cutter rotation shaft 30) inside the belt cover 11 forward. The belt tension mechanism 80 is attached to the attachment portion of the belt cover 11. The attachment portion of the belt cover 11 is cylindrical and protrudes rearward from the rear portion, approximately in the vertical center. The belt tension mechanism 80 is attached by being fitted into the attachment portion of the belt cover 11. Note that the belt tension mechanism 80 (attachment portion of the belt cover 11) is not limited to being positioned approximately in the vertical center of the rear portion of the belt cover 11, and can be positioned at any appropriate position on the belt cover 11 depending on the specifications, etc. The belt tension mechanism 80 includes a case 81, a cap 82, a moving arm 83, a biasing spring 84, a support shaft 85, a pair of left and right bearings 86, and a pair of left and right belt guides 87.

[0070] The case 81 of the belt tension mechanism 80 is cylindrical and is fitted into the mounting portion of the belt cover 11 and fixed thereto. The cap 82 of the belt tension mechanism 80 is detachably attached to the attachment portion of the belt cover 11 so as to cover the opening at the rear end of the attachment portion of the belt cover 11 .

[0071] The moving arm 83 of the belt tension mechanism 80 is configured as a flat metal plate with its longitudinal direction in the front-to-rear direction. The moving arm 83 is disposed within the case 81 and configured to be movable along the axial direction of the case 81 (approximately the front-to-rear direction). The moving arm 83 is disposed so that its rear portion is disposed within the case 81 and its front portion protrudes from the front opening of the case 81. The moving arm 83 has a through-hole 89 in its front portion through which the support shaft 85 is inserted, and is formed so as to be angular at its midpoint between the front and rear. The angular portion of the moving arm 83 is configured as a spring receiver 88 against which the front end of the biasing spring 84 abuts. The biasing spring 84 of the belt tension mechanism 80 is a coil spring and is disposed inside the case 81. The rear end of the biasing spring 84 is supported by a spring support disposed at the rear of the case 81, and the front end of the biasing spring 84 abuts against a spring receiver 88 of the moving arm 83, thereby biasing the moving arm 83 forward (towards the belt 16).

[0072] The support shaft 85 of the belt tension mechanism 80 is a cylindrical member that is inserted into a through-hole 89 in the moving arm 83 and is configured to protrude to the left and right from the moving arm 83. The support shaft 85 is configured to support a bearing 86 and a belt guide 87. The bearing 86 of the belt tension mechanism 80 is configured to be rotatable while in contact with the belt 16. The pair of bearings 86·86 are rotatably inserted through support shafts 85 on the left and right sides of the moving arm 83, and are disposed on the left and right sides of the front part of the moving arm 83. The front end of the bearing 86 is located forward of the front end of the moving arm 83. The left-right width of the pair of bearings 86·86 (the distance between the left end of the left bearing 86 and the right end of the right bearing 86) is configured to be slightly larger than the width of the belt 16.

[0073] The belt guide 87 of the belt tension mechanism 80 is configured to prevent the belt 16 from coming off the bearing 86. The belt guide 87 is a flat metal member configured to have a shape resembling a cut-out portion of a circle in a side view. The belt guide 87 has a through-hole 89 in its approximate center, through which the support shaft 85 is inserted. The pair of belt guides 87, 87 are inserted onto the support shaft 85 on the outer sides (left or right) of the left and right bearings 86, and are disposed in front of the moving arm 83 and on the left and right sides of the bearing 86, respectively. A retaining ring is provided on the outer side of the belt guide 87 to prevent the belt guide 87 and bearing 86 from coming off the support shaft 85. The interval between the pair of belt guides 87, 87 (the distance from the left belt guide 87 to the right belt guide 87) is configured to be slightly larger than the width of the belt 16. The belt 16 is configured to be positioned between the pair of belt guides 87, 87. The front portion (at least the front part) of the belt guide 87 is located forward of the front end portion of the bearing 86 .

[0074] The belt tension mechanism 80 configured in this manner applies tension to the belt 16 placed inside the belt cover 11 by abutting the pair of bearings 86 against the belt 16 while the moving arm 83 is biased forward by the biasing spring 84, and is also configured to absorb impacts to the belt 16 and vibrations of the belt 16.

[0075] As described above, the belt tension mechanism 80 is disposed within the case 81 and configured to be movable along the axial direction of the case 81. The belt tension mechanism 80 includes the moving arm 83 having the through-hole 89 through which the support shaft 85 is inserted, the biasing spring 84 that biases the moving arm 83 toward the belt 16, the support shaft 85 that is inserted into the through-hole 89 in the moving arm 83 and configured to support the bearing 86 and belt guide 87, and the bearing 86 that is inserted into the support shaft 85 and is rotatable while abutting against the belt 16. Therefore, the belt tension mechanism 80 can be configured thinner (thinner in the left-right direction) than a conventional belt tension mechanism 80 for the belt 16 within a belt cover. The left-right width of the belt cover can be configured to be 30 mm or less, for example. This allows the hammer mower 1 to be configured relatively compact.

[0076] Furthermore, as described above, the belt tension mechanism 80 is provided with the belt guide 87 configured to prevent the belt 16 from falling off when it is in contact with the bearing 86, so that the bearing 86 can be more reliably in contact with the belt 16, and the belt 16 can be more reliably in a state where tension is applied thereto.

[0077] When the work clutch lever 19 is turned ON and the work implement 3 is performing a grass cutting operation, when the work clutch lever 19 is turned OFF, the brake device (not shown) is activated, the rotation of the pulley 14 stops, and the transmission of power from the engine 6 to the work implement 3 stops. When the work clutch lever 19 is in the OFF state, the brake device (not shown) brakes the pulley inside the belt cover 10 provided on the power take-off shaft inside the shaft cover 12, stopping the rotation of the pulley, thereby stopping the rotation of the pulley 14. Note that the configuration for stopping the rotation of the pulley 14 when the work clutch lever 19 is in the OFF state is not limited to this, and for example, it is also possible to use a configuration in which the rotation of the pulley 14 is stopped by applying a brake to the pulley 14 when the work clutch lever 19 is in the OFF state. In this way, when the brake device (not shown) is activated and the rotation of the pulley 14 stops, tension is applied to the belt 16, and the moving arm 83 of the belt tension mechanism 80 is pushed back (moved in the opposite direction from the belt 16), so that the pulley 15 can rotate freely relative to the belt 16, and the belt 16 is loosened. Furthermore, since the cutter rotation shaft 30 is rotating when the work machine 3 is performing grass cutting operations, the pulley 15 continues to rotate freely relative to the belt 16 for a while even after the brake device (not shown) is activated and the rotation of the pulley 14 stops, and the cutter rotation shaft 30 and pulley 15 continue to rotate due to their inertia.

[0078] As described above, when the work clutch lever 19 is turned ON and the work machine 3 is performing a grass cutting operation, turning the work clutch lever 19 to the OFF state stops the rotation of the pulley 14. When the rotation of the pulley 14 stops, tension is applied to the belt 16, pushing back the moving arm 83 of the belt tension mechanism 80, and the belt 16 is loosened so that the pulley 15 can rotate freely relative to the belt 16. After the rotation of the pulley 14 stops, the pulley 15 rotates freely relative to the belt 16, and the cutter rotation shaft 30 and the pulley Since 15 continues to rotate due to its inertia, when the work clutch lever 19 is turned ON and the work machine 3 is performing a grass cutting operation, and then the work clutch lever 19 is turned OFF to activate the brake device and stop the rotation of the pulley 14, the belt 16 does not loosen and the pulley 15 does not spin freely relative to the belt 16. This reduces the load on the pulleys 14, 15, belt 16, etc., and prevents damage to the pulleys 14, 15, belt 16, pulley 14 brake device (not shown), etc. [Explanation of symbols]

[0079] 1 Hammermoa 2 Running part 3 Work equipment 4 Transmission case 5 Engine frame 6 Engine 7 Traveling axis 8 Running wheels 9 Front wheels 11 Belt cover 14 Pulley 15 Pulley 16 Belt 17 Handle 18. Traveling clutch lever 21 Back Handle 22 Mounting hole 23 Wheels 24 Cylinder part 27 Projection 28 Through Hole 29 Pin layout section 30 Cutter rotation axis 31 Cutter blade 35 Anti-rebound board 36 Lower 37 Upper 38 Side plate part 39 Driving Guide 40 Cutter cover 41 Main plate 42 Side panel 43 Bearings 44 Shaft cover 45 Viewing window 47 Visibility Mark 48 Protective plate 49 Spacer 50 Contact member 54 Fixing pin 60 Height adjustment mechanism 61 Rotating part 62 Operation section 63 Support member 64 Connecting member 66 Arm 67 Operating handle 73 Injection 74 Notch 80 Belt tension mechanism 84 Moving Arm 85 bias spring 86 bearings 87 Belt guide

Claims

1. A hammer mower in which a work implement for mowing a field is disposed at the front of the traveling part and performs mowing work while traveling, The traveling section includes a transmission case, an engine frame fixed to the transmission case, an engine mounted on the engine frame and serving as a power source for traveling and for working equipment, a traveling shaft that is mounted across the transmission case and driven by power transmitted from the engine, traveling wheels provided on the traveling shaft, a cutter cover that covers the top of the working equipment, and a front wheel provided near the cutter cover, The work machine is configured such that a cutter rotation shaft that is driven by power transmitted from the engine is traversed within the cutter cover, and a plurality of cutter blades are provided on an outer circumferential surface of the cutter rotation shaft, a bounce prevention plate for preventing stones and the like that bounce forward and hit the worker when the working machine is operating to mow grass; The anti-rebound plate is provided at the front end of the cutter cover, The hammer mower has a handle that is held by an operator when traveling or mowing, The anti-rebound plate has a running guide, When the hammer mower is driven by an operator holding the handle, the hammer mower is driven so that the driving guide is aligned with a predetermined object in the field as seen by the operator, thereby stabilizing the driving path of the hammer mower. Hammermore.

2. a height adjustment mechanism that adjusts the height of the work implement by changing the height position of the front wheels and fixing the changed height position of the front wheels, thereby raising or lowering the height of the work implement; The front wheel is disposed near a side of the cutter cover, the height adjustment mechanism includes an operating unit that is operated by an operator when adjusting the height of the work machine, The operating portion of the height adjustment mechanism is disposed above the cutter cover.

2. The hammer mower of claim 1.

3. The travel guide is provided at the upper end of the anti-rebound plate.

3. A hammer mower according to claim 1 or claim 2.

4. a side plate portion configured to take in grass just before it is cut by the working machine into the inside of the cutter cover when the hammer mower is traveling and performing grass cutting work, The side plate portion is configured to extend laterally outward from the front end portion of the cutter cover. A hammer mower according to any one of claims 1 to 3.

5. The side plate portion is disposed in front of the front wheel.

5. The hammer mower of claim 4.

6. The cutter cover is provided with a protective plate that is disposed inside the cutter cover and that prevents stones, grass, etc. that are kicked up when the work machine performs a grass-cutting operation from directly contacting the cutter cover. A hammer mower according to any one of claims 1 to 5.

7. a belt cover and a power take-off shaft to which power from the engine is transmitted, The power take-off shaft is inserted into the belt cover, and a pulley is provided inside the belt cover. The cutter rotation shaft is inserted into the belt cover, and a pulley is provided inside the belt cover. a belt is wound between the pulley of the power take-off shaft and the pulley of the cutter rotation shaft within the belt cover, so that power from the engine is transmitted to the cutter rotation shaft; a belt tensioning mechanism configured to apply tension to the belt disposed inside the belt cover and to absorb impacts to the belt, vibrations of the belt, etc.; The belt tensioning mechanism a case fixed to the belt cover; a moving arm disposed within the case and configured to be movable along an axial direction of the case, the moving arm having a through hole; a biasing spring that biases the moving arm toward the belt; a support shaft inserted into the through hole of the moving arm; a bearing that is inserted into and supported by the support shaft and is rotatable in contact with the belt, A hammer mower according to any one of claims 1 to 6.

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