JP6448048B2 - Offset mowing machine - Google Patents

Description

  The present invention relates to an offset mowing work machine that is mounted on a tractor and performs mowing work by offsetting a mowing working part to the side of the tractor, and relates to an offset mowing work machine that can be mounted on a tractor by a quick hitch. .

  As a prior art of this type of mowing machine, Japanese Patent Laid-Open No. 2012-191864 “Mowing Machine” discloses an example in which a mowing machine is mounted on a tractor by a quick hitch. In this example, in order to maintain the posture of the mowing working machine when being attached to and detached from the quick hitch, the mowing working unit is provided with a stand.

  Japanese Patent Application Laid-Open No. 2010-279285 “Mowing Machine” discloses an example in which a mowing machine is mounted on a tractor by a quick hitch.

JP 2012-191864 A JP 2010-279285 A

  It has been conventionally known that a work implement is easily attached to and detached from a tractor by a quick hitch. In order to attach and detach the work implement with the quick hitch, it is necessary to set in advance the positional relationship between the engaging portions of the tractor side and the detachable portion on the work implement side. For this reason, in a state where the work implement is removed from the tractor, a stand is provided and held on the work implement side so that the position of the engaging portion is in the attaching / detaching posture. However, since the overall weight increases as the mowing machine increases in size, the stand itself needs to increase in size and rigidity, and the weight of the stand also increases. For this reason, there is a problem that the stand cannot be easily attached and detached manually.

  Further, in the case of Patent Document 1 of the conventional example, when connecting to the tractor 501 by the quick hitch 506 (the number is cited in the publication, the same applies hereinafter), first, the top hook 507 on the upper part of the quick hitch 506 is attached. Engage with the top pin 113 of the mast frame body 111 on the work machine side and raise it so as to scoop up, and the engagement parts of the left and right lower ends of the quick hitch 506 are drawn and engaged with the lower pin 114 on the work machine side. . For this reason, when attaching and detaching with the quick hitch, it is necessary to take a forward inclined posture so that the lower pin 114 is in a position retracted with respect to the top pin 113 on the work machine side. However, in the case of an offset mower that performs mowing work by offsetting the mowing work part to the side of the tractor, the offset mechanism part is located between the tractor and the mowing work part, so that the interval needs to be more than a certain distance. For this reason, when the top pin 113 and the lower pin 114 on the work machine side are set to the position where the quick hitch is mounted, there is a problem that the ground height of the mowing working unit becomes high and the center of gravity becomes high and unstable when the stand is used. .

  For this reason, an object of the present invention is a mowing work machine capable of working with the working section offset, and has a structure that can be easily attached to and detached from the tractor by a quick hitch, so that handling of a stand and the like at the time of attachment and removal is easy. It is to provide a simple offset mowing machine. It is another object of the present invention to provide an offset mowing work machine that can be placed in a stable posture with a low center of gravity in a working state in which the connection with the tractor is released.

In order to solve the above-mentioned problem, the mowing machine according to claim 1 is an offset mowing machine that is attached to a tractor and offsets the mowing work part to the side of the tractor to perform the mowing work. The connecting frame for engaging the quick hitch for mounting to the tractor provided at the front end portion of the offset frame is connected in the horizontal direction perpendicular to the traveling direction provided at the front end portion of the offset frame. A frame rotation shaft allows a top pin portion, which is positioned above the engaging connection frame and attached to the tractor, to be rotated back and forth, and the engaging connection frame includes a forward-most inclined position including an intermediate position in the rotation range. in at least one position between the last tilting position from and wherein a is provided fixed and secured releasably to rotate O To propose a set mowing machine.

  According to a second aspect of the present invention, there is provided an offset mowing work machine according to the first aspect, wherein a range of rotation of the top pin portion above the engaging connecting frame in the front-rear direction can be changed.

According to a third aspect of the present invention, in the mowing work machine, the fixing and releasing of the rotation of the engaging connecting frame is performed at a position separated from the connecting frame rotating shaft located on the engaging connecting frame and on the engaging connecting frame side in a side view. a vertically rotatably fixed hook and check stopper provided was characterized by being performed by the engagement and disengagement of the horizontal rotation fixing pin perpendicular to the traveling direction provided on the offset frame side claimed The offset mowing machine according to Item 1 or 2 is proposed.

Engagement or disengagement of the check stopper and the rotation fixing pin provided on the offset frame side restricts or deregulates the rotation range of the engagement connecting frame, whereby the top pin portion above the engagement connection frame The offset mowing work machine according to claim 3, wherein the forward / backward rotation range with the connecting frame rotation axis as a rotation axis is restricted or released .

Mowing machine according to claim 5, fixed hooks and supervision stopper proposes offset mowing machine according possible to claim 3 or 4 characterized by being arranged to be biased in the rotational direction by an elastic body To do.

The mowing machine according to claim 6 is provided with a stand used for maintaining the posture of the offset mower when the working state is released from the connection with the tractor. An offset mowing machine according to any one of claims 1 to 5 is proposed.

  According to the present invention, since the quick hitch can be attached to and detached from the tractor, the attaching / detaching operation can be easily performed. In addition, in the state of work where the connection with the tractor is released, the center of gravity can be placed in a stable posture so that it can be stored safely. Furthermore, since a large, rigid stand is not required, handling is easy and manufacturing costs can be kept low. Furthermore, since the front portion of the offset frame is rotatable up and down by a certain range with respect to the tractor, it is possible to provide an offset mowing work machine that can perform appropriate mowing work even in a undulating field.

It is a side view just before engaging a quick hitch with the offset mowing working machine which implemented this invention. It is a side view of the state where the quick hitch was engaged and lifted to the offset mower working machine according to the present invention. It is a side view of the state which engaged the quick hitch with the offset mowing working machine which implemented this invention, raised it, accommodated the stand, and operated the connection frame rotation adjustment part. The side view which abbreviate | omitted one part of the movement state of the offset mowing working machine which implemented this invention. It is the side view which abbreviate | omitted a part of working state of the offset mowing working machine which implemented this invention. It is a top view of the offset mowing working machine which implemented this invention. It is a principal part top view of the connection frame rotation adjustment part of this invention. It is a top view for demonstrating a rotation adjustment lever guide. It is a principal part side view of the connection frame rotation adjustment part just before engaging the quick hitch of this invention. It is a principal part side view of the connection frame rotation adjustment part of the state which engaged and raised the quick hitch of this invention. It is a principal part side view of a connection frame rotation adjustment part when moving the offset mowing work machine of this invention. It is a principal part side view of the connection frame rotation adjustment part at the time of the working state of the offset mowing working machine which implemented this invention.

  Embodiments of the present invention will be described below with reference to the drawings of FIGS. In this description, the right direction, which is the tractor 1 side shown in FIG. 1, will be described as the traveling direction or the front side, and the left side will be described as the rear side.

  The offset mowing work machine 2 shown in this example is attached to a tractor three-point link mechanism provided at the rear of the tractor 1 by being engaged by a quick hitch 3, and is used by driving the mowing work unit 21 with power from the tractor 1. Is. Further, the mowing operation unit 21 is provided so as to be movable to the left and right with respect to the tractor 1, and can be operated on one side of the rear side of the tractor 1. It is possible to carry out forward cutting without stepping on. Further, the mowing operation unit 21 is provided so as to be rotatable up and down in a direction perpendicular to the traveling direction, and can perform mowing work on a slope in which the side of the tractor 1 is inclined.

  The offset mowing work machine 2 is configured such that an engagement connecting frame 4 that is a mounting portion to the tractor 1 is provided on the front side, a mowing work part 21 is provided on the rear side, and the offset mechanism part is positioned therebetween. . The offset mechanism portion is provided with a front frame 201 for connecting the engagement connecting frame 4 at the front end, and the square pipe-shaped offset frame 20 can be horizontally rotated from the front frame 201 to the mowing working portion 21 side. The mowing working unit 21 is connected to the rotation end side so as to be rotatable in the horizontal direction, and two offset frames 20 are provided in parallel in the left-right direction to form a parallel link in plan view as shown in FIG. The front frame 201 connected to the engagement connecting frame 4 is connected to the mowing working unit 21 side. The coupling frame 4 for engagement is configured as a mountain shape when viewed from the front, and a front frame 201 is attached to one side of the mountain-shaped frame on the side where the mowing working part 21 is moved sideways. Since the offset frame 20 is positioned in the parallel link state, the direction of the mowing work unit 21 is always the direction orthogonal to the traveling direction even if the mowing work unit 21 is moved left and right. The mowing working unit 21 moves left and right by bridging a cylinder 200 that is hydraulically or electrically extended and contracted between the front frame 201 and one of the offset frames 20 and extending the cylinder 200 to extend left and right. Turn to move.

  The quick hitch 3 is formed of a steel pipe having a mountain shape when viewed from the front, and a hook for locking the top pin 40 provided on the upper part of the engaging connecting frame 4 on the offset mowing machine 2 side from below. And a lower engaging portion 32 for engaging a lower pin 41 which is a connecting pin provided on the left and right below the engaging connecting frame 4. The lower engaging portion 32 is open at the rear. The lower pins 41 provided on the left and right sides of the engagement connecting frame 4 are engaged with the opening. A lower hook 31 for preventing the engaged lower pin 41 from coming off is provided in the opening so as to be freely fitted and removed. On the tractor 1 side, a top link pin 33 for mounting the top link 10 and a lower link pin 34 for mounting the lower link 11 for mounting on the three-point link mechanism of the tractor 1 are provided. The top link pin 33 is provided on the front side above the center portion of the quick hitch 3, and the lower link pin 34 is provided so as to protrude left and right on the lower left and right front sides. The three-point link mechanism of the tractor 1 is provided at the rear of the tractor 1 and includes a top link 10 provided at the upper center portion and lower links 11 provided at the lower left and right sides, and the top link 10 and the lower link 11 at the rear end portion. The quick hitch 3 detachably attached can be moved up and down by operation on the tractor 1 side.

  In order to mount the offset mowing work machine 2 to the tractor 1 by the quick hitch 3, the tractor 1 to which the quick hitch 3 is attached is moved backward, and the top hook 30 which is a hook-like engagement portion on the upper part of the quick hitch 3 is used. The top pin 40 provided on the upper portion of the engagement connecting frame 4 on the offset mowing work machine 2 side is lifted up by raising the three-point link mechanism. FIG. 1 shows a state immediately before scooping up. When scooped up and further raised, the lower pin 41, which is a connecting pin provided on the left and right sides below the engaging connecting frame 4, is drawn to the quick hitch 3 side and is engaged with the opening of the lower engaging portion 32 of the quick hitch 3. (Fig. 2). After the engagement, the lower hook 31 for preventing the lower pin 41 from coming off is engaged to fold the stand 6 to complete the connection (FIG. 3).

  When removing the offset mower 2, the reverse operation may be performed. The stand 6 is raised, the lower hook 31 of the quick hitch 3 is released, and the three-point link mechanism of the tractor 1 is lowered to make the quick hitch. When 3 is lowered, the top pin 40 and the lower lower pin 41 of the engagement connecting frame 4 are easily detached from the quick hitch 3.

  The stand 6 is provided at the front portion of the offset frame 20, and the offset mowing work machine 2, which has been disconnected from the tractor 1, is connected to the engaging frame provided at the front end of the offset frame 20 by the mowing work unit 21 and the stand 6. The attachment / detachment posture position 4 is stably held. The stand 6 is made of a pipe-shaped steel material, and a plate member having a ground contact surface is fixed to one end thereof, and the other end projects downward from the front lower surface of the one offset frame 20. A stand bracket 60 having a U-shaped cross section fixed thereto is fitted and attached by a stand pivot shaft 61 so as to be pivotable in the front-rear direction. The stand 6 is fixed by inserting a stand fixing pin 62 into a through hole provided parallel to the lower part of the stand bracket 60 from the stand rotating shaft 61. When the stand 6 is not used, the stand fixing pin 62 is removed and the stand 6 is rotated rearward to engage with a support bracket 63 provided on the lower rear surface of the offset frame 20. The through holes on the stand 6 side are overlapped, and the stand fixing pins 62 are inserted and stored along the offset frame 20.

  The mowing operation unit 21 is provided with a plurality of cutting blades radially swinging on a horizontal rotation shaft orthogonal to the traveling direction of the tractor 1 so as to pass up above the rotation shaft and scoop up from the front to the rear. Rotate to cut and weed the weeds. The upper part of the outer periphery of the cutting blade rotation trajectory is covered with a cutting part cover, which prevents scattering of cut weeds and the like, and some of the cut weeds and the like are carried around the rotation axis to be further finely crushed. It is provided as follows. A gauge roller 210 is provided at the rear lower part of the mowing work unit 21 so as to come into contact with the field scene, and maintains the ground height on the rear side of the mowing work unit 21. The gauge roller 210 has a cylindrical shape extending in the left-right direction, and left and right end portions are rotatably held behind the left and right side plates of the mowing working unit 21. The mowing working unit 21 is driven between a gear box input shaft (not shown) provided on the side of the mowing working unit 21 and an input shaft (not shown) of power from the tractor 1 provided on the engagement connecting frame 4. The power is transmitted through the universal joint 211 and driven.

  The engagement connecting frame 4 engaged with the quick hitch 3 is provided so as to be rotatable forward and backward with respect to the offset frame 20, and the rotation is performed by the front frame 201 at the front end portion of the offset frame 20 and the engaging connection frame. The structure is such that the restriction and the restriction are released by a connection frame rotation adjusting part 5 described later provided at a connection part with the frame 4. The connection between the front frame 201 and the engagement connecting frame 4 is provided at an upper portion of the front frame 201 and is rotatably connected by a connecting frame rotating shaft 202 in a horizontal direction orthogonal to the traveling direction. The engagement connecting frame 4 is connected to the front frame 201 so as to be rotatable forward and backward with the connecting frame rotating shaft 202 as a rotating shaft.

  The lower part of the connecting frame rotating shaft 202 of the front frame 201 is a flat part directed in the traveling direction, and is used for engaging when the upper part of the engaging connecting frame 4 rotates forward and tilts forward. The lower side of the connecting frame 4 abuts to prevent rotation. On the other hand, when the upper part of the engagement connecting frame 4 is rotated rearward, the engaging connection is made to the stopper pin 203 provided in the upper part of the connecting frame rotating shaft 202 of the front frame 201 in parallel with the connecting frame rotating shaft 202. When the frame 4 comes into contact with the frame 4, the rotation is prevented and the engagement connecting frame 4 is in the last inclined position.

  The connection frame rotation adjusting portion 5 is for restricting the rotation range of the engagement connection frame 4 and fixing the rotation in the rotation range of the engagement connection frame 4. The connection frame rotation adjusting unit 5 is provided on the front frame 201 and is provided at a lower portion spaced apart from the connection frame rotation shaft 202, and a rotation fixing pin 50 provided in parallel with the connection frame rotation shaft 202. The fixed hook 51 and the check stopper 52 which are provided on the side and are respectively attached to the hook rotation shaft 53 parallel to the connecting frame rotation shaft 202 so as to be rotatable in the vertical direction, the fixed hook lever 54 and the check for operating them. It comprises a stopper operating lever 55, a spring 56 for connecting the check stopper operating lever 55 and the check stopper 52, and a rotation adjusting lever guide 57 for guiding each lever.

  The fixing hook 51 is L-shaped in a side view, provided with attachment holes to the hook rotation shaft 53 at the corners, and both end portions directed toward the rear side are formed in hook shapes directed inward, Each of them has a shape that can be engaged with the rotation fixing pin 50 by rotating in the vertical direction. In addition, a fixed hook lever 54 is attached to the fixed hook 51 upward in a direction orthogonal to the hook rotation shaft 53, and is inserted into the guide hole of the upper rotation adjustment lever guide 57 to be guided. The fixed hook lever 54 is made of a wire material that can be bent, such as a piano wire, and a portion formed in a torsion coil shape is provided on the side of the attachment base to the fixed hook 51. Are attached elastically in the direction of rotation.

  The restraining stopper 52 has a flat plate shape and is provided with an attachment hole to the hook pivot shaft 53 on one end side, and the pivot end of the other end facing the rear side is a contact surface with the pivot fixing pin 50. The contact surface edge has a circular arc shape concentric with the rotation circle and a stopper provided so as to protrude outward from the arc shape portion. A round stopper-like control lever operating lever 55 is attached to the check stopper 52 upward in a direction perpendicular to the hook rotation shaft 53, and is inserted into and guided by the guide hole of the upper rotation adjustment lever guide 57. Yes. The attachment base of the check stopper operating lever 55 and the check stopper 52 is connected via a coil spring 56 inserted into both of them, and the check stopper operating lever 55 is elastically attached to the check stopper 52 in the rotation direction. Yes.

  FIG. 7 is a plan view of the main part of the connecting frame rotation adjusting unit 5. An offset frame 20 and a cylinder 200 are rotatably attached to the rear side of the front frame 201. Further, a connecting frame rotating shaft 202 and rotating fixing pins 50 and 50 are provided on the front side thereof, and both end portions of the connecting frame rotating shaft 202 are opposed to the front frame 201 with the plane portion in the left-right direction. It is inserted into a boss portion provided on the suspended plate-like portion and is rotatably held. Further, the rotating boss 42 of the connecting frame for engagement 4 is located between the boss portions provided on the plate-like portion that is vertically suspended from the left and right, and is similarly inserted into the connecting frame rotating shaft 202. Thereby, the connection frame 4 for engagement is connected with the front frame 201 so that rotation is possible. From both end sides of the rotating boss 42 of the coupling frame 4 for engagement, plate-like frames 43, 43, which are orthogonal to the rotating boss 42 and face the plate surface in the left-right direction, are extended in parallel to the front side. The lower pin 41 on one side is bridged between the plate frames 43 and 43 and is provided between the plate frames 43 and 43. Between the rotating boss 42 and the lower pin 41, the fixed hook 51, the check stopper 52, and the hook rotating shaft 53 are provided. The hook rotation shaft 53 is rotatably inserted into a hook rotation shaft boss 44 that is bridged and fixed in a horizontal direction orthogonal to the plate-like frames 43, 43, and ends thereof are respectively hook rotation shaft bosses 44. It protrudes from the end. Checking stoppers 52 and 52 are fixedly provided on the left and right outer side portions of the plate frames 43 and 43 at both ends of the projecting hook rotation shaft 53, respectively, and the rear rotation end side is rotated. Thus, it can be engaged with the rotation fixing pins 50, 50. Further, a fixed hook 51 is attached to one end of the hook rotation shaft 53 (the lower side in FIG. 7 in this example) so as to be rotatable with respect to the hook rotation shaft 53 in parallel to the outside of the check stopper 52. Thus, when it is rotated, the rotation end side can be engaged with the rotation fixing pin.

  The rotation adjustment lever guide 57 is for guiding the operation positions of the fixed hook lever 54 and the check stopper operation lever 55. On the surface of the rotation adjustment lever guide 57 orthogonal to each lever, the check stopper operation lever guide hole 570 and the fixed hook lever guide hole 571 that are guided by the fixed hook lever 54 and the check stopper operation lever 55 being inserted in parallel are adjacent to each other. Is provided. The check stopper operation lever guide hole 570 is provided with a long hole-shaped guide hole in the operation direction of the check stopper operation lever 55 and a notch portion at each end in a direction perpendicular to the long hole. When it is tilted and positioned at the notch, the operation of the check stopper operation lever 55 is blocked. Further, the fixed hook lever guide hole 571 is provided with a long hole-shaped guide hole in the operation direction of the fixed hook lever 54, each end thereof, and a notch in a direction perpendicular to the long hole at one position therebetween. When the fixed hook lever 54 is moved to the notch and positioned, the operation of the fixed hook lever 54 is blocked.

  The operation positions of the levers in the pivoting state of the engagement connecting frame 4 will be described with reference to FIGS. FIG. 9 is a side view of the main part of the connecting frame rotation adjusting unit 5 in a state where the engaging connecting frame 4 is tilted forward. This state is a state when the quick hitch 3 is engaged with the engaging connecting frame 4 (the state shown in FIG. 1). The engaging connecting frame 4 abuts the front frame 201 in the forward tilting rotation direction, and the rotation is fixed. The lower hook 511 of the fixing hook 51 is engaged with the pin 50 and the backward tilting rotation direction is blocked, and the engagement connecting frame 4 is fixed in a state of being tilted forward. At this time, the positions of the fixed hook lever 54 and the check stopper operating lever 55 of the rotation adjustment lever guide 57 are the respective positions shown in FIG. Are positioned at the notch portions at the front ends of the check stopper operation lever guide hole 570 and the fixed hook lever guide hole 571.

  FIG. 10 shows that the quick hitch 3 is engaged with the engagement connecting frame 4 to be raised and further raised, and the lower pins 41 which are connection pins provided on the left and right sides of the engagement connecting frame 4 are arranged on the quick hitch 3 side. The fixed hook lever 54 in a state where the lower hook 31 that is attracted and engaged with the opening of the lower engaging portion 32 of the quick hitch 3 and prevents the lower pin 41 from being detached after the engagement is engaged (the state shown in FIG. 3). The state of the check stopper operating lever 55 is shown. The positions of the fixed hook lever 54 and the check stopper operating lever 55 of the rotation adjusting lever guide 57 are the respective positions shown in FIG. 8B, and the fixed hook lever 54 and the check stopper operating lever 55 are checked. The stopper operating lever guide hole 570 and the fixed hook lever guide hole 571 are respectively positioned in the notches at the rear ends. At this time, the rotation stoppers 52 and the fixed hooks 51 are urged and abutted on the front frame 201 side, and the fixed hook lever 54 is made of a wire material that can be bent such as a piano wire material. In addition, a portion formed in a torsion coil shape is provided on the attachment base side to the fixed hook 51, and the fixed hook lever 54 is elastically attached to the fixed hook 51 in the rotational direction, so that the force is forced. The fixed hook lever 54 is biased by being positioned against the elastic force of the fixed hook lever 54 in the notch at the rear end of the fixed hook lever guide hole 571. At this time, the engagement of the fixing hook 51 with the rotation fixing pin 50 is in a released state. Further, the restraining stopper operating lever 55 is forcibly restrained by attaching an attachment base to the restraining stopper 52 via a coil spring 56 inserted into both of the restraining stopper operating levers 55 and elastically connecting them in the rotation direction. The stopper stopper 52 is biased by positioning the stopper operating lever 55 in the notch at the rear end of the stopper stopper lever lever hole 570 against the elastic force of the coil spring 56.

  Thereafter, when the three-point link mechanism of the tractor 1 is lowered, the mowing working portion 21 is first grounded, and when further lowered, the engagement connecting frame 4 integrated with the quick hitch 3 rotates the connecting frame. It rotates backward about the shaft 202. As a result, the rotation end sides of the check stopper 52 and the fixed hook 51 are rotated downward while sliding while being urged against and abutted on the front frame 201 side, and the front frame 201 side rotation is fixed. Each pin 50 is engaged with each other and the state shown in FIG. In the state of FIG. 11, the end of the check stopper 52 on the rotation end side engages with the rotation fixing pin 50, thereby preventing the engagement connecting frame 4 from rotating in the forward tilt direction. The engagement of the hook 510 and the rotation fixing pin 50 prevents the engagement connecting frame 4 from rotating backwardly. As a result, the rotation of the engagement connecting frame 4 is fixed. The state in which the rotation of the engagement connecting frame 4 is fixed in the middle of the rotation range is used when the offset mowing machine 2 is moved as shown in FIG. By setting the engagement connecting frame 4 to the position raised rearward from the forward tilt position, the ground clearance on the mowing work unit 21 side when the three-point link mechanism of the tractor 1 is raised can be increased.

  FIG. 12 shows the state of the fixed hook lever 54 and the check stopper operating lever 55 and the fixed hook 51 and the check stopper 52 when the mowing work is performed by the offset mowing work machine 2. The lever is in the state shown in FIG. 8C, and the check stopper operating lever 55 is positioned in the notch at the rear end of the check stopper operating lever guide hole 570, and the rotating end edge of the check stopper 52 is rotated. The engagement pin 4 is in a state of being engaged, and a part of the forward tilt side of the forward / backward rotation range of the engagement connecting frame 4 is restricted. The fixed hook lever 54 is positioned at a notch provided in the middle of the elongated hole-shaped guide hole of the fixed hook lever guide hole 571 so that the fixed hook 51 does not engage with the rotation fixing pin 50 of the front frame 201. It is in a state. In this state, the engagement connecting frame 4 is freely rotated from the position where the rotation end edge of the check stopper 52 is engaged with the rotation fixing pin 50 to the rear side. The rearward rotation of the engagement connecting frame 4 is brought into contact with the stopper pin 203 provided on the upper front frame 201 near the connection frame rotating shaft 202 by the rotation of the frame on the engagement connecting frame 4 side. The rotation range is restricted. In the mowing work, the farm field is not necessarily flat, and when there are undulations in the front and rear, the mowing work part 21 moves up and down with respect to the tractor 1 to follow the farm scene. By making the connecting frame 4 for engagement integrated with the quick hitch 3 around the connecting frame rotation shaft 202 to be rotatable during the operation, the mowing operation unit 21 follows the field scene and performs an appropriate mowing operation. Done.

  Next, the mowing work of the offset mowing machine 2 of the present invention will be described. The locking hook lever 54 and the check stopper operating lever 55 of the connecting frame rotation adjusting portion 5 of the offset mowing work machine 2 are positioned in the notch portion at the front end of the guide hole of the rotation adjusting lever guide 57, and the engaging connecting frame 4 is engaged. Is fixed in a forward leaning position. Then, the quick hitch 3 is attached to the three-point link mechanism behind the tractor 1 and moved backward, and the engaging frame on the offset mowing work machine 2 side by the top hook 30 which is a hook-like engaging portion on the upper part of the quick hitch 3. The top pin 40 provided at the upper part of the 4 is moved up by raising the three-point link mechanism. When scooped up and further raised, the lower pin 41, which is a connecting pin provided on the left and right sides below the engaging connecting frame 4, is drawn to the quick hitch 3 side and is engaged with the opening of the lower engaging portion 32 of the quick hitch 3. Match. After the engagement, the lower hook 31 that prevents the lower pin 41 from being pulled out is engaged and the stand 6 is folded and connected. Next, the positions of the fixed hook lever 54 and the check stopper operating lever 55 of the rotation adjustment lever guide 57 are respectively positioned in the notches at the rear ends of the respective guide holes. At this time, the rotation end side of the check stopper 52 and the fixed hook 51 is in a state of being urged against and in contact with the front frame 201 side.

  Next, when the three-point link mechanism of the tractor 1 is lowered to ground the mowing working unit 21 and further lowered, the engaging connecting frame 4 integrated with the quick hitch 3 is centered on the connecting frame rotating shaft 202. Rotate backward. Thereby, the rotation end side of the check stopper 52 and the fixing hook 51 is engaged with the rotation fixing pin 50 on the front frame 201 side. Accordingly, the rotation of the engagement connecting frame 4 is fixed at a position in the middle of the rotation range. In this state, when the three-point link mechanism of the tractor 1 is raised, the ground clearance of the rear mowing work unit 21 can be increased, and therefore, this is used when the offset mowing work machine 2 is moved. After the offset mowing machine 2 is mounted, the tractor PTO shaft 12 and the input shaft (not shown) provided on the engagement connecting frame 4 are connected by a universal joint (not shown), and the power from the tractor 1 can be taken out. Like that.

  To move to the working field and perform mowing work, each lever position of the rotation adjusting lever guide 57 is set so that the check stopper operation lever 55 is positioned at a notch at the rear end of the check stopper operation lever guide hole 570. The rotation end edge portion of the stopper 52 is engaged with the rotation fixing pin 50, and the fixed hook lever 54 is formed in a notch portion provided in the middle of the elongated hole-shaped guide hole of the fixed hook lever guide hole 571. The fixed hook 51 is not engaged with the rotation fixing pin 50 of the front frame 201. In this state, the rotation of the engagement connecting frame 4 is freely performed from the position where the rotation edge of the check stopper 52 is engaged with the rotation fixing pin 50 to the rear side, and the forward tilt side A part of the rotation range is in a restricted state. In mowing work, if the farm field is undulating, the mowing scene cannot be followed unless the mowing work unit 21 side moves up and down with respect to the tractor 1. By making the connecting frame 4 for engagement integrated with the quick hitch 3 around the connecting frame rotation shaft 202 to be rotatable during the operation, the mowing operation unit 21 follows the field scene and performs an appropriate mowing operation. Done.

  The mowing working unit 21 is moved sideways by expanding and contracting the cylinder 200 and rotating the offset frame 20. When the PTO shaft of the tractor 1 is rotated to drive the mowing operation unit 21 and the tractor is moved down to the field scene, the mowing operation is performed.

  To remove the offset mowing machine 2 from the tractor 1 after the mowing operation, the mowing working portion 21 is once lowered to the ground surface, and the fixed hook lever 54 and the check stopper operating lever 55 are moved to the guide hole of the rotation adjusting lever guide 57. It is located in the notch part of the front end. When the three-point link mechanism of the tractor 1 is raised, the engagement between the check stopper 52 and the rotation fixing pin 50 is released, and the engagement connecting frame 4 is rotated forward, so that the lower portion is the front frame. 201 abuts. Then, the lower hook 511 of the fixing hook 51 is engaged with the rotation fixing pin 50 and the rotation is fixed. The lower hook 31 that prevents the lower pin 41 of the quick hitch 3 from coming off is released, and the stand 6 is rotated downward and fixed. Next, when the three-point link mechanism is lowered, the stand 6 is grounded, and the top pin 40 and the lower lower pin 41 of the engagement connecting frame 4 are detached from the quick hitch 3. And the universal joint connected with the PTO axis | shaft of the tractor 1 can be removed, and the offset mowing work machine 2 can be removed.

  INDUSTRIAL APPLICABILITY The present invention can be used for an agricultural machine for mowing work that is mounted and used behind a traveling machine such as a tractor.

DESCRIPTION OF SYMBOLS 1 Tractor 10 Top link 11 Lower link 12 PTO axis | shaft 2 Offset mowing machine 20 Offset frame 200 Cylinder 201 Front frame 202 Connecting frame rotation axis 203 Stopper pin 21 Mowing working part 210 Gauge roller 211 Universal joint 3 Quick hitch 30 Top hook 31 Lower hook 32 Lower engaging portion 33 Top link pin 34 Lower link pin 4 Connection frame 40 for engagement 40 Top pin 41 Lower pin 42 Rotating boss 43 Plate frame 44 Hook rotating shaft boss 5 Connecting frame rotation adjusting portion 50 Rotation fixing pin 51 Fixed hook 510 Upper hook 511 Lower hook 52 Check stopper 53 Hook rotation shaft 54 Fixed hook lever 55 Check stopper operation lever 56 Coil spring 57 Rotation Sei lever guide 570 restrain the stopper operating lever guide hole 571 fixed hook lever guide hole 6 stand 60 stand bracket 61 stands rotary shaft 62 stand locking pins 63 support bracket

Claims (6)

In an offset mowing machine that is attached to the tractor and performs mowing work by offsetting the mowing work part to the side of the tractor, it is provided at the front end of the offset frame with respect to the offset frame for moving the mowing work part to the left and right in the working direction The connecting frame for engaging the quick hitch to be mounted on the tractor is positioned above the engaging connecting frame by a horizontal connecting frame rotating shaft perpendicular to the advancing direction provided at the front end of the offset frame. The top pin part for attaching to the front can be rotated back and forth, and the engagement connecting frame can be rotated at at least one position between the most forward tilt position and the last tilt position including the middle position of the rotation range. An offset mowing machine characterized in that it can be fixed and released.   The offset mowing work machine according to claim 1, wherein a range of rotation of the top pin portion above and below the engagement connecting frame can be changed. Fixing and releasing of the rotation of the engaging connection frame is a fixing provided in a position spaced apart from the connecting frame rotating shaft located on the engaging connection frame and so as to be rotatable in the vertical direction on the side of the engaging connection frame in a side view. a hook and check stopper offset mowing according to claim 1 or 2, characterized in that performed by the engagement and disengagement of the horizontal rotation fixing pin perpendicular to the traveling direction provided on the offset frame side Work machine. Engagement or disengagement of the check stopper and the rotation fixing pin provided on the offset frame side restricts or deregulates the rotation range of the engagement connecting frame, whereby the top pin portion above the engagement connection frame The offset mowing work machine according to claim 3, wherein a range of rotation in the front-rear direction using the connecting frame rotation axis as a rotation axis is restricted or released . The offset mowing work machine according to claim 3 or 4, wherein the fixed hook and the check stopper are provided so as to be urged in the rotation direction by an elastic body. The stand used for maintaining the posture of the offset mower when the working state is released from the connection with the tractor is provided on the offset frame . The offset mowing work machine according to any one of the above.