JP2017035029A - Mowing work machine - Google Patents

Abstract

A mowing work machine configured to prevent the mowing work part from rotating or moving by an easy operation when the mowing work part is in the retracted position behind the tractor. When the mowing work unit is in a non-working position located behind the tractor, the vertical movement of the surface perpendicular to the tractor traveling direction of the mowing work unit and the horizontal movement to the side are prevented. A stopper means 8 is provided, and the stopper means 8 is actuated by bringing the mowing working part 5 into a non-offset state and a substantially horizontal state located behind the tractor. . [Selection] Figure 4

Description

  The present invention relates to an improvement of an agricultural machine that is attached to a tractor and performs mowing work.

  JP-A-2013-53 (Patent Document 1) and JP-A-2012-44884 (Patent Document 2) are disclosed as conventional techniques of this type of mowing apparatus.

  In Patent Document 1, “when the mowing working part is located behind the tractor, there is provided a regulating means for preventing the mowing working part from rotating in the vertical direction in the direction perpendicular to the tractor traveling direction, The regulating means operates when the mowing working portion is brought into a substantially horizontal state in the offset state behind the tractor. " Patent Document 2 states that “the two arms constituting the parallel link are each provided with a protruding portion that protrudes toward the other arm while shifting the position thereof, and at one position of the offset movement, An offset working machine is disclosed in which protrusions come into contact with each other to serve as a stopper, and at the other position of the offset movement, at least one of the projections of one arm comes into contact with the other arm to serve as a stopper. ing.

JP 2013-53 A JP 2012-44884 A

  In the case of a mowing work machine that can work by offsetting from the tractor to the side, it is possible to cut the side part where the tractor is not traveling, and the mowing work part can be rotated up and down in the direction perpendicular to the traveling direction By doing so, it is possible to cut a portion inclined in the vertical direction on the side with respect to the tractor traveling portion. When the mowing operation unit is located behind the tractor, the mowing operation unit does not need to rotate, and the operation is performed in a horizontal state parallel to the tractor axle. Further, when moving in a non-working state, the state where the mowing working unit is positioned in a horizontal state behind the tractor is in a state where the balance of the center of gravity is the best. However, since the mowing operation part is held by the cylinder so as to be able to rotate up and down in the direction perpendicular to the traveling direction, the mowing operation part rotates downward during traveling due to internal leakage of the cylinder, etc. It may lead to accidents such as accidentally dragging the ground. In addition, when a stand is provided on the mowing operation part side when attaching to or detaching from the tractor, there is a problem that the attaching side is not horizontal when the mowing work part side and the attachment part side are not parallel, making attachment and detachment difficult. . Similarly, when a cylinder is used to offset the mowing working part to the side, an accident such as a collision caused by the mowing working part offset to the side during traveling due to internal leakage of the cylinder, etc. There is a risk of getting up.

  Therefore, an object of the present invention is to provide a mowing machine configured at a low cost so that the mowing working unit does not rotate or move by an easy operation when the mowing working unit is in the retracted position behind the tractor. .

  In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that the mowing working part is advanced from the rear part of the tractor by a turning arm which is connected to the rear part of the tractor and which is provided with a pair of left and right parallel plan view parallel links. The mowing working portion is provided on the rotating end side of the rotating arm and is connected to a position displaced to the left or right side of the mowing working portion. The mowing working unit is capable of rotating the mowing working unit up and down on a surface perpendicular to the tractor moving direction about a rotating shaft of the mowing working unit provided parallel to the moving direction. Stopper means is provided for preventing the vertical movement of the surface perpendicular to the tractor advancing direction of the mowing working unit and the horizontal movement to the side when the non-working position is located behind. Stage is a mowing machine, characterized by operating by the mowing unit on and substantially horizontal condition in a non-offset state positioned to the tractor rear.

  In the invention according to claim 2, the stopper means moves in the left-right direction by engaging the projecting portions projecting on opposite sides of the left and right rotating arms that horizontally move the mowing working portion. The engagement piece provided on either of the right and left rotating arms is engaged with the engaging portion on the mowing working portion side to prevent the mowing working portion from rotating up and down. The mowing machine according to claim 1.

  Further, according to the invention of claim 3, the stopper means engages an engaging portion provided on the left and right rotating arm and an engaging portion provided on the mowing working portion side, so that the mowing working portion moves horizontally. 2. The mowing machine according to claim 1, wherein the mowing machine is configured to prevent vertical rotation.

  According to the present invention, since the stopper means is provided for preventing the mowing working portion from rotating in the vertical direction and horizontally moving to the side, the mowing working portion is inadvertently moved due to a cylinder leak or the like. Therefore, a mowing machine capable of performing safe work can be provided. In addition, since the mounting portion is always horizontal by the stopper means when attaching to and detaching from the tractor, the attachment and detachment can be performed satisfactorily.

It is a side view of the working state of the mowing machine of the present invention. It is a top view in the state where the mowing working part of the mowing work machine of the present invention was located behind the tractor. It is a top view in the state where the mowing work part of the mowing work machine of the present invention was offset to the tractor side. It is the top view which carried out the partial cross section in the state where the mowing operation part was located behind the tractor and the stopper means was activated. It is a principal part rear view of the stopper means for preventing the horizontal movement to a side. It is a front view of a mowing work part. It is a principal part top view of the stopper means in the state where rotation in the up-and-down direction of the mowing operation part is not prevented. It is a principal part top view of the state which the stopper means for preventing the rotation to the up-down direction of a mowing operation part is act | operating. It is a principal part rear view of the state which inclined the mowing work part downward. It is a top view for demonstrating a power transmission part. It is the side view which showed the state which mounts a mowing machine on a tractor. It is a top view of the mowing working machine which showed another Example of the stopper means of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  The mowing work machine shown in this example is mounted on a three-point link hitch mechanism provided at the rear of the tractor 1 and is used by driving the mowing work unit 5 with power from the tractor 1. Further, the mowing operation unit 5 is provided so as to be movable to the left and right with respect to the tractor 1 and can be operated to the side of the tractor 1. First, forward cutting work is possible.

  The mowing machine of this example is provided with a mounting portion 2 for mounting on the tractor 1 at the front portion, and a mowing working portion 5 is provided behind the mounting portion 2. It is connected through. The offset mechanism unit 6 is configured by a parallel link in plan view. The parallel link front end is connected to the mounting part 2 side and the rear end side is pivotally connected to the mowing work part 5 side, so that the orthogonal posture changes with respect to the traveling direction even if the mowing work part 5 moves left and right. It is configured not to.

  The mounting portion 2 is provided with an auto hitch device, and a hitch frame 20 is attached to a three-point link mechanism, which is an elevating device provided behind the tractor 1, and the hitch frame 20 is raised by the three-point link mechanism. When the mowing machine is lifted, the mowing machine is automatically connected and attached. A hitch frame 20 (referred to as a quick hitch or an auto hitch or the like) is used to form a three-point link hitch mechanism comprising a pair of left and right lower links 11 provided at the rear of the tractor 1 and a top link 10 provided at the upper center thereof. When the top hook 207 above the hitch frame 20 is engaged with the top pin 210 at the center upper portion provided in front of the mowing machine and the three-point link hitch mechanism is raised, the mowing machine side Lower pins 205 provided on the front lower left and right sides are attracted to the hitch frame 20 side, engage with the U-shaped groove of the lower plate 206 of the hitch frame 20, and are prevented from coming off by a hook 208 provided in the U-groove portion. And mowing machine are connected.

  The mowing working unit 5 is provided with a bevel gear case 3 which is a power input unit provided on one side upper part of the mowing working unit 5 and projects forward from the bevel gear case 3 as shown in FIG. The provided second input shaft 30 and the first input shaft 212 provided in the mounting portion 2 are connected by a universal joint 65 that can extend and contract in the axial direction, and the front side of the first input shaft 212 is connected to the tractor PTO shaft 13. The power is taken out from the tractor 1 by the universal joint 12 and the mowing working unit 5 is driven. Since the second input shaft 30 and the first input shaft 212 provided in the mounting portion 2 are connected by a universal joint 65 that can be expanded and contracted in the axial direction, the parallel provided between the mounting portion 2 and the mowing working portion 5 is provided. It absorbs the amount of displacement between the cores when the offset mechanism section 6 constituted by a link is rotated.

  The bevel gear case 3 is provided so as to protrude outward from the cutting blade 51 at the outermost end of the mowing working unit 5, and the bevel gear case 3 receives power input to the second input shaft 30 by the internal bevel gear 31. Conversion and shifting are performed in a direction perpendicular to the second input shaft 30. The converted power is transmitted from one side of the bevel gear case 3 to the side end of the mowing unit 5 through the horizontal output shaft 32. An output pulley 33 is fixed to the tip of the output shaft 32 on the side end portion side, and an input pulley 57 fixed to the end of the rotary shaft 50 of the mowing working unit 5 is provided below the output pulley 33. The power input to the second input shaft 30 by the power transmission belt stretched around these pulleys is transmitted to the rotary shaft 50 of the mowing working unit 5 and is driven to rotate. The pulley and the transmission belt portion are covered and guarded by a belt cover 4.

  The mowing working unit 5 has a mowing rotor 56 in which a plurality of mowing blades 51 are swingably provided on a horizontal rotating shaft 50 orthogonal to the tractor traveling direction, and this is cut above the rotating shaft 50. Rotate the grass so that it passes from the front to the back so that the grass will pass through. The upper part of the outer periphery of the cutting blade 51 rotation trajectory is covered with a cutting unit cover 52 to prevent scattering of the cut weeds and the like, and to move some of the cut weeds around the rotating shaft 50. It is provided to be further crushed finely. Both end portions of the rotary shaft 50 are held by side plates 55 which are covers on the left and right sides of the cut portion cover 52 via bearings 550.

  The front end portion of the cutting portion cover 52 protrudes forward from the cutting rotor 56 and is bent in the vertical direction downward from the horizontal plane continuously protruding from the front of the cutting portion cover 52 and the front end thereof. An L-shaped part is formed. A large number of flaps 520 are hung down in the width direction of the mowing working unit 5 at the lower end of the inverted L shape so that foreign matter or the like bounced off by the mowing rotor 56 does not jump out. .

  A gauge roller 7 is provided in the lower rear portion of the mowing operation unit 5 and is grounded to the ground surface during the operation to maintain the ground height on the rear side of the mowing operation unit 5. The gauge roller 7 is provided in a cylindrical shape having a length substantially equal to the cutting rotor 56, and the left and right end portions of the mowing working unit 5 are rotated via bearings 72 on a mounting plate 70 extending rearward from the left and right side plates 55. It is held freely. A plurality of attachment holes for the attachment plate 70 to the side plate 55 are provided, and the height of the mowing working unit 5 is adjusted by selecting and attaching the attachment hole positions.

  The offset mechanism unit 6 that moves the mowing working unit 5 to the left and right is connected to the mounting unit 2 so that the front end side is horizontally rotatable and extends rearward, and one end rotates to the mounting unit side. An offset electric cylinder 63 that is connected to the moving arm 60 side in a horizontally rotatable manner and rotates the rotating arm 60 in the horizontal direction by its expansion and contraction operation, and the mowing working unit 5 on the rotating end side of the rotating arm 60. The rotary arm 60 is provided in a pair parallel to the left and right, with the front end on the mounting portion 2 side and the rear end on the grass cutting work portion holding bracket 64 on the grass cutting work portion 5 side. Each of them is connected by a front rotation shaft 61 and a rear rotation shaft 62 provided in the vertical direction to form a parallel link, and the mowing working unit 5 is arranged from the rear position of the tractor 1 shown in FIG. 2 to the tractor 1 shown in FIG. To both sides Even right movement is performed orthogonal orientation of the working unit cutting the traveling direction is configured so as not to be changed. Since it is composed of an offset mechanism using a parallel link, the structure is simple and the manufacturing cost can be kept low.

  The mowing working unit holding bracket 64 is held on a rotating end side of the rotating arm 60 by a vertical rotating shaft 62 in a parallel link mechanism so as to be horizontally rotatable and parallel to the traveling direction. The mowing operation unit rotating shaft 53 provided horizontally holds the mowing operation unit 5 so as to be rotatable in the vertical direction on a surface orthogonal to the traveling direction. An electric cylinder 54 for rotating the mowing work part is connected to the mowing work part 5 side and the mowing work part holding bracket 64 side so that both ends can be freely rotated. In addition, a rotation mechanism unit that rotates the mowing operation unit 5 up and down around the rotation shaft 53 of the mowing operation unit is configured. By rotating the mowing operation unit 5 up and down, weeds and the like on an inclined surface that is inclined vertically to the side of the traveling surface of the tractor 1 can be cut.

  The offset mechanism portion 6 is connected to the mounting portion 2 on the front end side through a connection bracket 203 to a lower portion of one side of the mast frame 202 of the mounting portion 2 via a connection bracket 203, and is connected to the rear side of the connection bracket 203. The moving arm 60 is held by a vertical rotation shaft 61 provided in the vertical direction, and one end on the front side of the connection bracket 203 is connected to the mast frame 202 by a horizontal vertical rotation shaft orthogonal to the traveling direction. doing. Although this front-rear rotation angle is restricted to a certain range, this makes it possible for the mowing working part 5 to swing back and forth within a certain range with respect to the mounting part 2 and to follow the unevenness of the working field during work. Has been.

  3 to 8, a description will be given of stopper means for preventing the rotation and lateral movement of the mowing working unit 5 of this example. 4 and 8 show a state in which the mowing operation part 5 is located behind the tractor, and the vertical rotation stopper plate 80 is fitted in the U-shaped notch 580 of the holding bracket side rotation link arm 58. 3 and 7 show a state in which the up and down rotation stopper plate 80 is separated from the holding bracket side rotation link arm 58 in a state in which the mowing working unit 5 is offset.

  The vertical movement of the mowing operation unit 5 is rotated about the mowing operation unit rotation shaft 53 that is a horizontal axis parallel to the traveling direction provided in the mowing operation unit holding bracket 64. The rotation is turned up and down by the extension and contraction of the electric cylinder 54 for turning the mowing work part spanned between the mowing work part 5 and the mowing work part holding bracket 64.

  The electric cylinder 54 for rotating the mowing operation part is attached to an attachment bracket having one end fixed on the upper surface of the mowing part cover 52 of the mowing work part 5 so as to be freely rotatable by a rotation axis parallel to the traveling direction. The rotation link arm is connected to the two rotation link arms, and one end of the rotation link arm is rotatably attached to the mowing working unit holding bracket 64 by a rotation axis parallel to the traveling direction. And a working part side rotation link arm 59 attached to a mounting bracket whose one end is fixed to the upper surface of the cutting part cover 52 of the mowing work part 5 by a rotating shaft parallel to the traveling direction. The other end is rotatably connected by the same axis. As shown in FIG. 6, the holding bracket side turning link arm 58 and the working unit side turning link arm 59 are connected to the cutting cylinder turning electric cylinder 54 in the front view of the mowing working unit 5. It is arranged in a triangular shape, and has a link configuration in which the mowing operation part rotating shaft 53 is arranged in the vicinity of the bottom, and when the mowing operation part rotating electric cylinder 54 is extended, the mowing work part 5 rotates downward. When it shrinks, it turns upward.

  In this example, the front side of the electric cylinder 54 for turning the mowing operation part is covered with a cylinder cover 540, and the holding bracket side turning link arm 58, the working part side turning link arm 59, and the mowing work part turning. The connecting portion with the electric cylinder 54 is exposed to the front side from the long hole provided in the cylinder cover 540 in the extending and contracting direction of the electric cylinder 54 for rotating the mowing operation portion, and the electric cylinder for rotating the mowing operation portion from the tractor driver seat. The length of 54, that is, the rotation angle of the mowing operation portion 5 corresponding to this length can be confirmed by a scale 541 provided in the upper portion of the long hole.

  Stopper means for preventing the mowing operation unit 5 from rotating in the vertical direction is such that the mowing operation unit 5 is placed horizontally on the lower edge of the holding bracket side rotation link arm 58 on the mowing operation unit rotation shaft 53 side. A U-shaped notch 580 that opens toward the rotation end of the mowing working unit 5 is provided at the position, and a vertical rotation stopper provided on the rotation arm 60 in the notch 580. The plate 80 is fitted so as to prevent the mowing working unit 5 from rotating up and down.

  The vertical rotation stopper plate 80 is provided so as to protrude from the side of one rotary arm 60 on the side approaching the mowing work unit 5 when the mowing work unit 5 is at the rear position of the tractor. A flat strip-like material is extended from the upper surface of the rotating arm 60 toward the U-shaped notch 580, and the end is a horizontal plane parallel to the upper surface of the rotating arm 60, When the mowing working portion 5 is horizontal, the end portion is fitted into the U-shaped cutout portion 580 of the holding bracket side turning link arm 58. A plate-like reinforcing member is fixed in a T-shaped cross section below the flat strip member.

  When the mowing working part 5 is horizontal and is in a non-working position behind the tractor 1, the up / down turning stopper plate 80 is fitted into the U-shaped notch 580 to turn the holding bracket side turning link arm 58. Fix it. When the mowing operation part 5 moves in the offset direction from the rear position of the tractor 1, the vertical rotation stopper plate 80 is disengaged from the U-shaped notch 580 of the holding bracket side rotation link arm 58, and the mowing work is performed. The part 5 can be turned in the vertical direction. The fitting between the vertical rotation stopper plate 80 provided on the rotary arm 60 and the mowing work unit 5 side is not limited to the U-shaped notch 580 of the holding bracket side rotary link arm 58. However, it is sufficient if it is provided on the mowing working unit 5 side and fitted to prevent rotation. Further, the rotation prevention direction may be only the downward direction.

  4 and 5, the stopper means for preventing the horizontal movement of the mowing working unit 5 from the side will be described. FIG. 4 shows a state in which the mowing operation unit 5 is located behind the tractor, and the vertical rotation stopper plate 80 is fitted into the U-shaped notch 580 of the holding bracket side rotation link arm 58 to In this state, the vertical rotation is prevented. Further, as shown in FIG. 5, a horizontal left engaging plate 811 and a right engaging plate 812 projecting toward the rotating arms are provided on the opposing surfaces of the rotating arms 60 and 60, respectively. Each of the plates is fixed so that a vertical hole is superposed in a position state where the vertical movement of the mowing unit 5 is prevented. By inserting the fixing pin 810 into this hole, the rotation arms 60, 60 are prevented from rotating in the horizontal direction.

  That is, when the mowing working unit 5 is horizontal and is in the non-working position behind the tractor 1, the fixing pin 810 is inserted into the holes of the left engaging plate 811 and the right engaging plate 812 to rotate the mowing working unit 5. The horizontal movement to the side is prevented. In this state, it is possible to prevent the mowing operation part from rotating downward or moving sideways inadvertently during traveling due to an internal leak or the like of the mowing work part rotating electric cylinder 54 or the offset electric cylinder 63.

  FIG. 9 is a rear view of the main part of the mowing working machine of this example in a state where the mowing working part 5 is offset and inclined, and the universal joint 65 portion is omitted. By offsetting the mowing operation unit 5 as shown in FIG. 9, the mowing work of the side portion where the tractor is inclined in a horizontal state can be performed. Although this figure shows the case where it inclines below, even if it inclines upward, it can work similarly. In the state where the mowing working unit 5 is offset, the engagement of the vertical rotation stopper plate 80 is released, and the engagement fixing pins 810 of the left engagement plate 811 and the right engagement plate 812 of the rotation arm 60 are removed. It becomes a state.

  FIG. 12 shows a stopper means 8 'according to another embodiment. When the mowing working unit 5 is horizontal and is in the non-working position behind the tractor 1, the stopper means 8 'is provided with a plate-like rotating arm engaging plate 813 projecting horizontally from one rotating arm 60 and mowing. A vertical through hole is provided in the overlapping portion of the plate-like mowing working portion engaging plate 814 projecting horizontally from the working portion 5, and a fixing pin 810 ′ is inserted and fixed. The rotary arm engagement plate 813 is provided in a bifurcated manner in the vertical direction, and the mowing work part engagement plate 814 is positioned so as to enter between the bifurcated shapes. With this configuration, the mowing working unit 5 is prevented from rotating downward and moving sideways. By pulling out the fixing pin 810 'and moving the mowing working part 5 to the side where the overlapping of the rotating arm engaging plate 813 and the mowing working part engaging plate 814 is released, the mowing work can be moved up and down. Can be moved horizontally.

  Next, the operation of the mowing machine according to the present invention will be described. The tractor 1 is attached to the tractor 1 by the attachment portion 2 provided at the front portion of the mowing machine, the first input shaft 212 of the attachment portion 2 and the tractor PTO shaft 13 are connected by the universal joint 12, and are rotationally driven by the power from the tractor 1. . At this time, in the case of the connection by the auto hitch device, as shown in FIG. 11, these are fixed to a three-point link hitch mechanism comprising a pair of left and right lower links 11 of the tractor 1 and a top link 10 provided at the upper center thereof. When the hitch frame 20 to be attached is attached and the top hook 210 above the hitch frame 20 is engaged with the top pin 210 at the center upper portion provided in front of the mowing work machine and the three-point link hitch mechanism is raised, the mowing work machine The lower pins 205 provided on the front lower left and right sides of the side are pulled toward the hitch frame 20 side and engaged with the U-shaped groove of the lower plate 206 of the hitch frame 20, and the hook 208 provided in the U-groove part is retained. The tractor 1 and the mowing machine are connected. In the case of this example, when it is connected, the universal joint 12 is also connected at the same time. At this time, if the electric cylinder 54 for turning the mowing operation part is expanded or contracted due to an internal leak or the like, the mowing work part 5 is held by the stand 9, so that the mast frame 202 is tilted left and right and cannot be attached. Although there is a possibility, since the rotation is prevented by the stopper means 8 of the present invention, it can be easily mounted. When the mowing machine is mounted and the fixed pin 810 of the rotating arm 60 part is removed after moving to the work field, the work can be performed.

  The input power is transmitted from the universal joint 12 to the second input shaft 30 of the bevel gear case 3 through the first input shaft 212 and the universal joint 65 of the mounting portion 2. The power of the second input shaft 30 is transmitted to the side end side of the mowing working unit 5 by the output shaft 32 by the bevel gear 31 inside the bevel gear case 3. An output pulley 33 is fixed to the distal end of the output shaft 32, and an input pulley 57 fixed to the end of the rotary shaft 50 of the mowing operation unit 5 is provided below the output pulley 33, and is stretched around these pulleys. The power is transmitted to the rotary shaft 50 of the mowing working unit 5 by the transmission belt and is driven to rotate. The rotary shaft 50 is provided with a plurality of cutting blades 51 in a swingable manner so that weeds and the like that have been cut pass through the rotary shaft 50 so as to scoop up from the front to the rear, The weeds are cut and crushed by the progress of the tractor. The upper part of the outer periphery of the cutting locus of the cutting blade 51 is covered with the cutting portion cover 52 to prevent scattering of the cut weed and the like, and a part of the cut weed is rotated by the scooping surface of the cutting blade 51. Bring it around the shaft 50 to crush it further.

  The mowing work unit 5 performs the work by adjusting the offset position from the tractor 1 by moving the offset electric cylinder 63 of the offset mechanism unit 6 to the left and right by extending and contracting the mounting unit 2. By offsetting the mowing work part 5 from the tire side of the tractor 1 and running the field part surface after cutting the tractor 1, the mowing work part 5 is positioned at an uncut part and the work is performed. However, it is possible to prevent occurrence of uncut residue caused by stepping over weeds or the like in an unworked part.

  By offsetting the mowing unit 5 from the tire side of the tractor 1 to the outside, and further extending and retracting the mowing unit rotating electric cylinder 54 to rotate the mowing unit 5 up and down in the direction perpendicular to the traveling direction, The mowing work of the slope of the side part inclined up and down with respect to the traveling surface of the tractor 1 becomes possible. The movement and rotation operation of the mowing operation unit 5 is operated by a control box provided near the driver's seat.

  When the mowing work is completed, the mowing work part 5 is leveled and moved to the rear of the tractor 1, and at this time, the vertical turning stopper plate which is stopper means for preventing the mowing work part 5 from turning in the vertical direction. 80 is fitted into the U-shaped notch 580 of the holding bracket side turning link arm 58, and the fixing pin 810 is inserted into the engaging plate of the turning arm 60, whereby the mowing working part 5 is attached to the tractor 1. It can be in a horizontal state parallel to the axle. Further, in the case of traveling, the mowing unit 5 is held by the vertical rotation stopper plate 80 and the fixing pin 810. Therefore, the mowing unit is mowing during traveling due to internal leakage of the cutting cylinder rotating electric cylinder 54 or the offset electric cylinder 63. It is safe without the working unit 5 rotating downward or inadvertently sliding to the side. In addition, when the stand 9 is provided on the mowing working part 5 side when the quick hitch is attached to or detached from the tractor, the stopper means 8 is operated so that the mounting part 2 side is always horizontal and the quick hitch is attached / detached well. Can be done.

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

DESCRIPTION OF SYMBOLS 1 Tractor 10 Top link 11 Lower link 12 Universal joint 13 Tractor PTO shaft 2 Mounting part 20 Hitch frame 200 Lower link pin 201 Top link pin 202 Mast frame 203 Connection bracket 205 Lower pin 206 Lower plate 207 Top hook 208 Hook 210 Top pin 212 First DESCRIPTION OF SYMBOLS 1 Input shaft 3 Bevel gear case 30 2nd input shaft 31 Bevel gear 32 Output shaft 4 Belt cover 5 Mowing working part 50 Rotating shaft 51 Mowing blade 52 Mowing part cover 53 Mowing working part rotating shaft 54 Mowing working part rotating electric cylinder 540 Cylinder Cover 541 Scale 55 Side plate 550 Bearing 56 Cutting rotor 57 Input pulley 58 Holding bracket side turning link arm 580 Notch 59 Working part Side turning link arm 6 Offset mechanism part 60 Turning arm 61 Forward turning shaft 62 Rear turning shaft 63 Electric cylinder for offset 64 Mowing working part holding bracket 65 Universal joint 7 Gauge roller 70 Mounting plate 8 Stopper means 80 Vertical turning Stopper plate 81 Horizontal movement stopper 810 Fixed pin 811 Left engagement plate 812 Right engagement plate

Claims (3)

The mowing working part can be horizontally moved from the rear part of the tractor to the side perpendicular to the traveling direction by a turning arm that is connected to the rear part of the tractor and is configured to form a pair of left and right plan view parallel links so as to be horizontally rotatable. The mowing operation unit is provided on the rotating end side of the rotating arm, and is connected to a position displaced to the left or right side of the mowing operation unit, and the mowing operation unit circuit provided parallel to the traveling direction and horizontally. In the mowing machine that can rotate the mowing working part up and down the plane perpendicular to the tractor traveling direction around the moving axis,
Stopper means for preventing vertical rotation and lateral movement of the surface perpendicular to the tractor traveling direction of the mowing working unit when the mowing working unit is in a non-working position located behind the tractor. Is provided, and the stopper means is actuated by bringing the mowing working part into a non-offset state and a substantially horizontal state located behind the tractor.   The stopper means prevents the movement in the left-right direction by engaging the projecting portions projecting on the opposite sides of the left and right rotating arms that horizontally move the mowing working portion, and rotates either left or right. 2. The mowing operation according to claim 1, wherein the engagement piece provided on the moving arm is engaged with the engaging portion on the mowing working portion side to prevent the mowing working portion from rotating up and down. Machine.   The stopper means engages an engagement portion provided on the left and right rotation arm and an engagement portion provided on the mowing operation portion side to prevent horizontal movement and vertical rotation of the mowing operation portion. The mowing machine according to claim 1, wherein the mowing machine is configured.

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