JP2010041928A - Safety device of farm implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device of a farm implement, which prevents the release of a lock device for locking the movement of a variable member for moving a working portion. <P>SOLUTION: The safety device of the farm implement includes: an engaging member 71 which is installed between a front frame 13 and a link mechanism (parallel link) 40 comprising link members 41, 42, 43 and a rear frame 45, and whose one end engages with either of the link mechanism 40 or the front frame 13; and a catching member 76 which is connected to the other of the link mechanism 40 or the front frame 13 and can catch a portion 71c to be caught, formed in the other end of the engaging member 71. The catching member 76 can catch the portion 71c to be caught of the engaging member 71 in the direction for releasing the engagement of one end, when the working portion 50 has a rearward movement work posture. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  Agricultural work in which the work part is moved to an offset position opposite to the forward work, and the offset work at the reverse work in which the traveling body is moved backward by reversing the front-rear relation (reversing the traveling direction) is provided. Relates to the safety device of the machine.

  An agricultural work machine such as a hull coater connected to the rear part of the traveling machine body is subjected to an offset operation that proceeds with the traveling of the traveling machine body while the working unit is moved to the side of the traveling machine body during work. In order to perform the work at the time of operation, the working part projects from the traveling machine body in the width direction of the traveling machine body. Therefore, when not working, in order to reduce the space of the entire agricultural machine and to improve the structural stability (balance) of the entire agricultural machine, the working part is within the width of the traveling machine body (case storage). Position).

  Moreover, about the offset operation | work of an agricultural machine, the position of a working part may differ depending on when a traveling machine body moves forward and when moving backward. Specifically, the working unit protrudes from the traveling machine body to one side in the width direction during forward operation, and protrudes from the traveling machine body to the other in the width direction during backward operation. That is, the working unit may be moved according to the working state.

  In this way, the working unit is moved when shifting from the working state to the non-working state, or when shifting from one working state to another working state. This is performed by moving a member, a transmission frame, or the like) with power from a device or a person.

  And in order to prevent a movable member from moving freely, the agricultural working machine is provided with the locking device (refer to patent documents 1). The safety device of Patent Document 1 includes a slide rod and a fixing device that are interposed between a main frame and a working unit including a pretreatment body and a trimming body. An engagement hole is formed in the cylinder of the slide rod. By inserting a pin of the fixing device into the engagement hole, rotation of the chain case that rotates the working portion is prevented.

JP 2002-165502 A (paragraph 0013, FIG. 1 and FIG. 2)

  Although the movement of the movable member can be prevented by the lock device of Patent Document 1, the lock device is released against the will of the operator by the vibration or erroneous operation of the farming machine caused by running on a non-leveled field, for example. The movable member locked by the device may move freely.

  The present invention has been made in view of such a background, and an object thereof is to propose a safety device for an agricultural machine that prevents the release of a lock device that prevents the movement of a movable member that moves a working unit.

A first invention includes a front frame having a mounting portion mounted on a rear portion of a traveling machine body, a plurality of link members that are swingably connected to the front frame, and connected to the moving end side of each link member. A rear frame, and a transmission frame rotatably connected to the rear frame and supporting the working portion at the tip position,
The transmission frame is a safety device for a farm work machine that is rotatable between a forward working position where the working unit is in a forward working posture and a reverse working position where the working portion is in a backward working posture,
A link mechanism comprising the link member and the rear frame, and an engaging member that is spanned between the front frame and has one end engaged with either the link mechanism or the front frame;
A locking member connected to the other of the link mechanism or the front frame and capable of being locked to a locked portion formed at the other end of the engaging member;
The locking member can be locked to the locked portion of the engaging member in a direction in which the engagement of the one end is released when the working portion is in the backward working posture. .

  The engaging member is installed between the link mechanism consisting of a link member, which is a movable member, and the rear frame, and the front frame, and one end engages with either the link mechanism or the front frame. The link mechanism is locked by the member. That is, the locking member constitutes a locking device.

  When the working part is in the reverse working posture, the locking member connected to either the link mechanism or the front frame is connected to the locked part formed at the other end of the engaging member. It can be locked in the direction in which the engagement of the one end is released. Therefore, when the engagement of the engagement member is to be released, the engagement of the engagement member is not released, and the locking member and the locked portion are locked. Is done. Here, “the direction in which the engagement is released” does not mean that the engagement is actually released, but within the range in which the engagement is maintained as if the engagement is released. The direction in which the member moves.

“Lockable” means that the locking member and the locked portion do not have to be in contact with each other when the working portion is in the backward working posture. That is, even if a slight gap is formed between the locking member and the locked portion, and the engagement member moves by the gap, the engagement member may not be released. In other words, the safety device has a slight “playing part” for operation, which is advantageous in terms of design and operation.

  In addition, since the safety device operates by using the operation of the lock device, the number of operations of the entire agricultural machine does not change even if the safety device is provided, so that the operation is not complicated. Therefore, erroneous operation is prevented.

  In a second aspect of the present invention, the locking member is fixed to a rotating shaft of the transmission frame. The fact that the locking member is fixed to the rotating shaft of the transmission frame means that the operation of the safety device of the lock device can be switched by the movement of the transmission frame.

By the way, in the form of offset work, that is, when the position of the work part is divided between forward work and reverse work, the position of the work part is switched (moved) around the turning axis of the transmission frame. May be done by. Here, since the operation of the safety device of the lock device can be switched by the movement of the transmission frame, the operation of the safety device can be selected according to the form of the offset work. This is effective when the work unit is moved to the storage position only from one of the work positions (the forward work position or the reverse work position).

  The reason will be explained. For example, when the working unit is arranged at the reverse working position, that is, when the working unit protrudes from the left side (hereinafter, simply referred to as the left side) with respect to the forward direction in the width direction of the traveling machine body, It is necessary to first move the part to the forward working position and then to the storage position. Here, when the working unit is arranged at the reverse working position, if the entire link mechanism moves to the left side, the working unit protrudes further to the left side, so that the stability of the whole agricultural working machine is impaired and the agricultural working machine rolls over. This is because there is a fear. Therefore, in this case, when the working unit is disposed at the reverse working position, the lock device can prevent the working unit from moving to the left side by the safety device.

  Furthermore, an increase in the number of components can be suppressed by using the pivot shaft of the transmission frame for the operation of the safety device.

  The present invention includes a link mechanism made of a movable member, an engagement member installed between the front frame, and a locking member connected to either the link mechanism or the front frame. Since the working part can be locked to the locked part of the engaging member in the direction in which the engaging member is released when the working part is in the backward working posture, the movement of the movable member that moves the working part Can be prevented from being released.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. Although the drawing shows a case where the working unit 50 supported by the transmission frame 51 is a padding working unit and the farm work machine 1 is a padding machine, the form of the farm working machine 1 (working unit 50) is not limited at all. In addition, the entire agricultural machine 1 capable of offset work is included. In the following, an example of a basket coater as the farm work machine 1 will be described.

  FIG. 1 shows a front frame 13 having a mounting portion 10 attached to the rear portion of a traveling machine body 100, and a plurality of parallel link members 41 and 42 that are pivotably connected to the front frame 13 and constitute a parallel link 40. The link members 41, 42 are connected to the moving end side of the link members 41, 42, and are connected to the rear frame 45, which also forms the parallel link 40, and the rotation shaft 53 (rotation center) protruding from the transmission frame 51. 1 shows a farm machine 1 having a transmission frame 51 to be operated.

  The working portion 50 is supported at the tip position of the transmission frame 51, and the transmission frame 51 is moved around the rotating shaft 53 to a forward working position where the working portion 50 is in the forward working posture (see FIG. 1) and a backward working posture. It is possible to rotate between the reverse work position (see FIG. 3). The transmission frame 51 is movable in parallel between a forward work position and a storage position (see FIG. 5) where the working unit 50 is in the storage posture.

  As shown in FIGS. 1 and 2, the farm work machine (spider coater) 1 is connected to the traveling machine body 100 at the mounting portion 10 of the front frame 13 having the input shaft 4 to which power from the traveling machine body 100 is input. The traveling machine body 100 is attached to the traveling machine body 100 by being connected to a three-point link coupling mechanism (not shown) provided at the rear portion of the traveling machine body 100, and performs a smearing operation according to the forward movement and the backward movement of the traveling machine body 100. .

  The mounting portion 10 is joined to the rear side of the connecting frame 11 and the connecting frame 11 that can be connected to the three-point link connecting mechanism of the traveling machine body 100 via a pair of support arms 12 and 12 ′ arranged in parallel in the width direction of the traveling machine body 100. The input shaft 4 is arranged at the lower center of the connecting frame 11 in the length direction. Power from the PTO shaft (not shown) of the traveling machine body 100 is transmitted to the input shaft 4 via a transmission shaft (not shown).

  A pair of support arms 12 and 12 ′ projecting rearward at a predetermined interval in the length direction of the connection frame 11 are connected to the rear end side of the connection frame 11 so as to be rotatable in the vertical direction. The front frame 13 is joined to the rear ends of 12 and 12 '. The front frame 13 has a length sufficient to support the link members 41 and 42 at a distance. The front frame 13 is reinforced and mounted with a forward drive shaft 22 and a reverse drive shaft 23 that receive power from the traveling machine body 100, and an attachment frame 15 for connecting the link members 41 and 42 is provided in the front frame. 13 is fixed so as to surround.

  The mounting frame 15 is transmitted between the link members 41 and 42 arranged in parallel to the back (rear) side of the forward drive shaft 22 and the reverse drive shaft 23, which are output shafts located particularly on the back (rear) side of the input shaft 4. In order to secure a space for storing the rotation center portion of the frame 51, the traveling body 100 is displaced in the width direction with respect to the input shaft 4. Specifically, since the forward drive shaft 22 is disposed on the same line as the input shaft 4, the rotational shaft 53 (rotation center) is only half the distance between the forward drive shaft 22 and the reverse drive shaft 23. From the same line of the input shaft 4, the traveling machine body 100 is shifted to the left with respect to the forward direction.

  Box-shaped brackets 17 and 16 for supporting the link members 41 and 42 project toward the rear side (transmission frame 51) from both side positions in the length direction of the mounting frame 15. Support shafts 18 and 20 that pivotally support the link members 41 and 42 are projected from end positions on the rear side. Of the brackets 17, 16, the overhanging length of the bracket 17 located on the right side with respect to the folding side (advance work position side) of the link members 41, 42, that is, the forward direction of the traveling machine body 100 is opposite. The length of the bracket 16 located on the left side of the side (reverse working position side) is smaller than the overhang length from the mounting frame 15. A large distance between the link members 41, 42 is ensured in the folded state of the link members 41, 42, and the forward driven shaft 30 and the reverse driven shaft 30 positioned around the rotation shafts 52, 53 of the transmission frame 51, etc. This is because the rear frame 45 is brought close to the mounting frame 15 (front frame 13) while the frame is held between the link members 41 and 42. The mounting frame 15 and the brackets 16 and 17 are included in the front frame of the present invention.

  The front end portion of the first link member 41 located on the working portion 50 side when in the forward working position is connected to the support shaft 18 of the bracket 17 located on the right side with respect to the forward direction of the traveling machine body 100, and on the left side. The second link member 42 located on the working portion 50 side when in the forward working position is connected to the support shaft 20 of the bracket 16 located. Both end portions of the rear frame 45 are rotatably connected to the rear end portions (moving side end portions) of the link members 41 and 42 via rotation shafts 54 and 52.

  A support shaft 20 penetrating from the left bracket 16 protrudes in the vertical direction, and the second link member 42 is connected to the upper end of the support shaft 20. The second link member 42 is disposed at the lower end of the support shaft 20 in parallel with the second link member 42. A third link member 43 that supports the transmission frame 51 together with the link member 42 is coupled. The parallel link 40 includes a mounting frame 15 (front frame 13) and a rear frame 45 that are parallel to each other, and a first link member 41, a second link member 42, and a third link member 43 that are parallel to each other.

  Coaxial rotation shafts 52 and 53 are disposed between the rear end portions of the second link member 42 and the third link member 43. A rotation shaft 52 is disposed on the upper side between the rear end portions of the second link member 42 and the third link member 43, and the second link member 42 and the rear frame 45 are rotatably connected to the rotation shaft 52. On the other hand, the rotation shaft 53 is disposed on the lower side, and the third link member 43 and the transmission frame 51 are rotatably connected to the rotation shaft 53.

  Accordingly, when all the link members 41 to 43 are interlocked and simultaneously swing downward in FIG. 1, the rear frame 45 moves away from the attachment frame 15 (front frame 13). At this time, since the transmission frame 51 is locked by the rotation lock device and is restrained by the rear frame 45, the transmission frame 51 is attached together with the rear frame 45. Move away from frame 15 (front frame 13).

  On the other hand, when the transmission frame 51 rotates 180 ° with the rotation shaft 53 as the rotation center O from the state of FIG. 1 where the working unit 50 is in the forward operation position to the state of FIG. The member 41 is locked by a rocking lock device, and the rocking of all the link members 41 to 43 is prevented.

  As described above, since the transmission frame 51 and all the link members 41 to 43 are provided with the lock mechanisms, respectively, the transmission frame 51 rotates around the rotation shaft 53, while the all link members 41 to 43 are connected to each other. In order to swing about the support shafts 18 and 20 (the rear frame 45 moves in parallel), the lock by the lock mechanism must be released. Hereinafter, the rotation lock device that is the lock mechanism of the transmission frame 51 and the swing lock device that is the lock mechanism of the link member will be described.

  The rotation lock device includes a front engaged member 82, a rear engaged member 83, which are arranged in parallel in the length direction of the rear frame 45, and an engagement pin 81 that protrudes from the transmission frame 51. . When the engagement pin 81 is engaged with any of the engaged members 82 and 83, the transmission frame 51 is locked, and the rotation of the transmission frame 51 around the rotation shaft 53 is prevented. Specifically, the engaging pin 81 engages with the engaged member 82 when the working unit 50 is disposed at the front working position, and the engaged member 83 when disposed at the rear working position. Engage with.

  Both the engaged members 82 and 83 are juxtaposed on the rear frame 45 at a predetermined distance in the length direction. These engaged members 82 and 83 are connected to the rear frame 45 from the rotating shaft 53. It is pivotally supported by rotating shafts 82a and 83a formed at positions where the distance between the rotating shaft 53 and the engaging pin 81 is set toward both ends. This is because the transmission frame 51 is locked when the working unit 50 is disposed at the forward working position or the backward working position, and the engagement pin 81 also rotates around the rotation shaft 53 during this transition. Because.

  Both engaged members 82 and 83 are formed with engaged recesses 82b and 83b into which the engaging pin 81 can be engaged. Since the engaging pin 81 is rotatable around its axis, it rotates together with the transmission frame 51 and abuts on any of the engaged members 82 and 83 and simultaneously rotates around its axis. At this time, the engaged members 82 and 83 also rotate around the rotation shafts 82 a and 83 a by the contact with the engaging pins 81. Then, the engaging pin 81 advances while rotating the side surfaces of the engaged members 82 and 83 around the axis, and finally engages with the engaged recesses 82b and 83b, so that the transmission frame 51 is connected to the rear frame 45. Restrained by As a result, the transmission frame 51 is locked by the rotation lock device.

  On the opposite side of the engaged members 82 and 83 with the rotation shafts 82a and 83a of the engaged recesses 82b and 83b interposed therebetween, the lock between the engaged members 82 and 83 and the engaging pin 81 is released. The release pieces 82c and 83c are formed. Specifically, release pieces 82c and 83c project from the engaged members 82 and 83 on the outer side in the width direction of the agricultural machine 1. By applying a force to the release pieces 82c and 83c so that the engaged members 82 and 83 rotate in a direction opposite to the direction in which the engaged members 82 and 83 are locked to the engaging pin 81, the engaged members 82 and 83 and the engaging pin 81 are applied. Since the engagement with is released, the transmission frame 51 can be rotated at this time.

  In this embodiment, a release rod 84 is rotatably provided on the transmission frame 51 as a means for applying a load to the release pieces 82c and 83c. That is, the release rod 84 is rotatably attached to a rotation shaft 84 a formed on the transmission frame 51. The locking piece 84b formed at the end of the release rod 84 near the engaged members 82 and 83 is located behind the agricultural machine 1 in the rotation direction (clockwise in FIG. 1 and counterclockwise in FIG. 3). It faces the release pieces 82c, 83c of the engaged members 82, 83 from the side.

  Therefore, by rotating the release rod 84 in the direction, the engaged members 82 and 83 rotate in the opposite direction to the release rod 84, and the engagement between the engagement pin 81 and the engaged members 82 and 83 is engaged. Is released. And if rotational force is given to the cancellation | release rod 84 as it is, the rotational force of the direction which rotates the rear side of the agricultural working machine 1 centering on the rotation axis | shaft 53 on the transmission frame 51 via the rotating shaft 84a of the cancellation | release rod 84 will be produced. Given. Since the rotational force is applied to the transmission frame 51 with the rotation lock device unlocked, the transmission frame 51 rotates, and in FIG. 1, the working unit 50 moves to the reverse operation position.

  Thus, when the engagement pin 81 is released from the engaged state with the engaged members 82 and 83 in order to reliably apply the rotational force to the transmission frame 51 via the rotation shaft 84a of the release rod 84. In addition, the engaged members 82 and 83 preferably apply a reaction force to the release rod 84. For this purpose, for example, when the engaged members 82 and 83 are rotated by the release rod 84 and the engagement with the engagement pin 81 is released, the engaged members 82 and 83 further apply the present force. It can be set so that it cannot rotate in a given direction. Here, “disengagement” means that the engagement pin 81 completely escapes from the engaged recesses 82b and 83b.

  On the other hand, the rocking lock device includes an engaging member 71 that is rotatably provided on the rear frame 45, an engaged member 72 that is provided on the link member 41 and is engaged with the engaging member 71, and a rear frame 45. The coil spring 77 is attached and biased so that the engaging member 71 is engaged with the engaged member 72. The engaging member 71 is rotatably provided on a rotating shaft 71a provided on the rear frame 45. The engaging piece 71b of the engaging member 71 is engaged with the engaged member 72, and the engaging member 71 is The rear frame 45 and the link member 41 are installed. In the drawing, the engaging member 71 is formed in a U-shape, and is supported by the rotating shaft 71a in the vicinity of the break-point of the U-shape.

  In the axial direction of the engaging member 71 (along the shape), on the opposite side of the locking piece 71b across the rotation shaft 71a, there is a locked portion 71c that is connected to the coil spring 77 and applies an urging force. Is formed. When the engaging member 71 is disposed so as to be engaged with the engaged member 72, the coil spring 77 is disposed so as to be biased in a direction in which the engaging member 71 is engaged with the engaged member 72. . In the drawing, the locked portion 71c is formed on the opposite side of the connecting point between the rear frame 45 and the link member 41 from the rotating shaft 71a, and the coil spring 77 of the agricultural machine 1 is compared to the locked portion 71c. Since it is arrange | positioned at the back side, the urging | biasing force to the engaging member 71 by the coil spring 77 turns into a tensile force. Here, when the coil spring 77 is disposed closer to the traveling machine body 100 than the locked portion 71c, the biasing force becomes a compressive force.

  The engaged member 71 receives a rotational force in a direction to engage with the engaged member 72 around the rotation shaft 71a by receiving the tensile force from the coil spring 77 toward the rear side of the agricultural machine 1 from the coiled portion 77c. Therefore, the swing lock device prevents the rear frame 45 and the link member 41 from rotating away from each other around the rotation shaft 54. That is, the swing (rotation) of the link members 41 and 42 around the rotation shafts 18 and 20 is prevented.

  In order to unlock the rocking of the link members 41 and 42 (43) by the rocking lock device, a releasing means is provided in the link member 41. The release means includes a substrate 73 pivotally supported on a rotation shaft 73a provided on the link member 41, an operation rod 74 for operating the substrate 73, and a coil spring 75 for restraining the substrate 73 on the link member 41. It consists of

  The board 73 is disposed between the engaging member 71 and the link member 41, and a guide piece 41 b formed on the link member 41 protrudes from a guide hole 73 b formed on the board 73. This is because the movement of the substrate 73 is regulated by the guide piece 41b moving along the guide hole 73b when the substrate 73 rotates about the rotation shaft 73a.

  The board 73 is formed with a release piece 73c for rotating the engagement member 71 to release the lock by the rocking lock device. 71 is disposed on the same side as the engaged member 71. Accordingly, for example, when the operation rod 74 is used to rotate the substrate 73 in a direction to release the lock by the swing lock device, the release piece 73c rotates the engagement member 71 to release the lock by the swing lock device.

  When the substrate 73 is rotated in order to release the lock by the swing lock device, a tensile force is generated in the coil spring 75 installed between the link member 41 and the substrate 73, and the tensile force is applied to the engagement member by the substrate 73. Resist the rotational force applied to 71. Therefore, when the load applied to the substrate 73 via the operation rod 74 is released, the guide piece 41b moves along the guide hole 73b to the end opposite to the guide hole 73b, and the guide piece 41b Return to the original position (position at the time of locking) in the guide hole 73b.

  Further, the farm work machine 1 prevents the transmission link 51 (working part 50) from moving outward in the width direction of the farm working machine 1 due to the deformation of the parallel link 40 when the working part 50 assumes the backward working posture. Safety devices are provided. The parallel link 40 is deformed (the link members 41, 42, 43 swing to the operating part 50 side (lower side in FIG. 3), and the rear frame 45 translates to the operating part 50 side) in the reverse working posture. As a result, the operating unit 50 moves away from the traveling machine body 100, the protruding length from the width of the traveling machine body 100 increases, the overall stability is impaired, and there is a risk that the traveling machine body 100 and the farm work machine 1 roll over. Because there is.

  As shown in FIG. 1, the safety device is fixed to the engaging member 71, the rotating shaft 76 a formed on the rotating shaft 53 of the transmission frame 51, and protruding from the upper surface of the rear frame 45, and the rotating shaft 76 a. And a locking member 76. The method for fixing the locking member 76 to the rotating shaft 76a is not limited. The rotating shaft 76a rotates with the rotating shaft 53, and is formed in, for example, a substantially elliptical cross-sectional shape to prevent the locking member 76 from rotating with respect to the rotating shaft 76a (see FIG. 6). Since the locking member 76 only needs to be prevented from rotating to the rotation shaft 76a, the locking member 76 may have a cross-sectional shape other than a substantially elliptical shape.

  The locking member 76 is in contact with the locked portion 71c of the engaging member 71 or disposed at a close distance when the working portion 50 is in the backward working posture. In this state, the close distance is such that, for example, the substrate 73 is rotated by the operation rod 74 or the like, and the engaging member 71 rotates around the rotation shaft 71a until the locked portion 71c contacts the locking member 76. Also refers to the length that does not release the engagement.

  When the working portion 50 is in the backward working posture, if the force is applied to the engaging member 71 in a direction (clockwise in FIG. 3) in which the engaging member 71 is disengaged from the engaged member 72 due to an erroneous operation or the like, the rotating shaft 71a is moved. Rotate to center. At this time, the locked portion 71b also attempts to rotate in the same manner, or rotates by a close distance and comes into contact with the locking member 76. The locking member 76 is fixed to the rotation shaft 76a, and the rotation shaft 76a is formed on the rotation shaft 53 protruding from the transmission frame 51 locked by the rotation lock device. The stop portion 71 c is locked to the locking member 76. Therefore, the rotation of the engaging member 71 is prevented and the lock by the engaging member 71 is not released. Thus, the movement of movable members such as the link members 41 to 43 and the transmission frame 51 can be prevented with a simple structure. In addition, prevent the loss of the balance of the farm machine and the traveling machine connected to the farm machine due to the unexpected movement of the movable member, and contact with surrounding people and objects due to the loss of the balance. Can do.

  In this embodiment, the rocking lock device including the engaging member 71 is provided on the first link member 41 side, but the rocking lock device is provided on the second link member 42 side. Also good. In this case, for example, the rear frame 45 is extended to the working portion 50 side in the backward working posture, and the rotating shaft of the engaging member is provided in the extended portion. Then, when the link member 42 swings, the locking piece of the engaging member is engaged with the engaged member formed in the same shaft shape as the support shaft 20 from between the link members 41, 42. Make the shape you want.

Then, the locked portion is formed from the vicinity of the rotation shaft of the engaging member toward the first link member in the substantially axial direction of the rear frame 45. Here, the locking member 76 is fixed to the rotating shaft 76a so that the locked portion 71c can be locked in the direction in which the engagement of the engaging member is released. In this case, since the support shaft 20 is closer to the rear frame 45 than the support shaft 18, the engagement member 71 (swing lock device) can be downsized.

  The transmission frame 51 has a box shape in order to store a power transmission mechanism that transmits power to the working unit 50, and projects from the rotating shaft 53 to the working unit (spreading working unit) 50 side. It is constructed and a working part (spreading working part) 50 is connected to the tip part. The power transmission mechanism transmits power from a forward passive clutch 31 or a reverse passive clutch 32 described later to the working unit 50.

  As shown in FIG. 1, the working unit (spreading working unit) 50 shown in FIG. 1 cuts the old paddle formed along the periphery of the field and deposits the soil, and cuts the piled soil. And a trimming unit 57 for painting on the old crease. The pretreatment unit 55 includes a tilling rotor that is rotatably supported. The tilling rotor is connected to and supported by the transmission frame 51. The trimming unit 57 includes a polyhedral drum 58 that is rotatably supported. The polyhedral drum 58 is connected to and supported by the transmission frame 51. Power from the driven shaft 30 is transmitted to the tilling rotor and the polyhedral drum 58 via a power transmission mechanism in the transmission frame 51.

  A forward drive shaft 22 and a reverse drive shaft 23, which are arranged at a predetermined distance in the length direction, are attached to an intermediate portion in the longitudinal direction of the front frame 13 (attachment frame 15). ) To the rear frame 45 side. The forward drive shaft 22 is located on the same axis as the input shaft 4, and power from the input shaft 4 is transmitted to the forward drive shaft 22 via a universal joint (not shown).

  The power transmitted to the forward drive shaft 22 is transmitted to the reverse drive shaft 23 through gears 25 and 26 attached to the forward drive shaft 22 and the reverse drive shaft 23. When power is transmitted to the forward drive shaft 22, power is also transmitted to the reverse drive shaft 23, and both drive shafts 22 and 23 rotate. A forward drive clutch 27 is connected to the distal end portion of the forward drive shaft 22, and a reverse drive clutch 28 is connected to the distal end portion of the reverse drive shaft 23. The protruding lengths of the forward drive shaft 22 and the reverse drive shaft 23 from the front frame 13 are equal, and the distances from the front frame 13 to the tips of the forward drive clutch 27 and the reverse drive clutch 28 are also equal. The forward drive shaft and the reverse drive shaft of the present invention include a forward drive clutch 27 and a reverse drive clutch 28, respectively.

  A driven shaft 30 having axes parallel to the axes of the forward drive shaft 22 and the reverse drive shaft 23 is located near the rotational center O of the transmission frame 51 and closer to the working unit 50 side than the rotational shaft 53. It is supported. The driven shaft 30 is mounted through the transmission frame 51, and both end portions in the axial direction protrude from the side surface of the transmission frame 51. The distance from each side surface of the transmission frame 51 to each tip of the driven shaft 30 is equal. In the present embodiment, the driven shaft 30 serves both for forward movement and backward movement, but the driven shaft 30 is separated for forward movement and backward movement, and is connected to the forward drive shaft 22 and the reverse drive shaft 23, respectively. Sometimes. Even when the driven shaft 30 is separated for forward movement and backward movement, the respective axes are arranged on the same line.

  When the working unit 50 is in the forward working position shown in FIG. 1, the forward passive clutch 31 is connected to the tip of the driven shaft 30 on the side protruding from the side surface on the front frame 13 side of the transmission frame 51, and the rear side A reverse passive clutch 32 is connected to the tip end portion of the driven shaft 30 on the side protruding from the side surface. The distances from the side surfaces of the transmission frame 51 to the tips of the forward passive clutch 31 and the reverse passive clutch 32 are also equal.

  A rotation shaft 53 serving as a rotation center O of the transmission frame 51 is positioned on a straight line passing through a midpoint between a straight line passing through the forward drive shaft 22 and a straight line passing through the reverse drive shaft 23. The passive clutch 32 is located on a straight line passing through a position that is a half of the distance between the forward drive shaft 22 and the reverse drive shaft 23 from the rotation shaft 53. As a result, as long as the link members 41 to 43 are in the folded state, the axis of the driven shaft 30 (the forward passive clutch 31 and the reverse passive clutch 32) is used as the forward drive shaft regardless of the rotation of the transmission frame 51. 22 (forward drive clutch 27) or reverse drive shaft 23 (reverse drive clutch 28) can be positioned on the axis.

  Accordingly, when the link members 41 to 43 are in the folded state and the working unit 50 shown in FIG. 1 is in the forward working position, the forward passive clutch of the driven shaft 30 of the forward drive shaft 22 (forward drive clutch 27). When the axes 31 are in a state of being connected to each other and the working unit 50 shown in FIG. 3 is in the reverse drive position, the reverse drive shaft 30 reverses the axis of the reverse drive shaft 23 (reverse drive clutch 28). The axes of the passive clutch 32 for use coincide with each other and can be connected to each other.

  In addition to the positional relationship between the drive shafts 22 and 23 and the driven shaft 30 in the length direction of the front frame 13, the distance between the front frame 13 and the transmission frame 51 when the link members 41 to 43 are in the folded state. Is adjusted, the forward drive shaft 22 (forward drive clutch 27) is connected to the forward passive clutch 31 of the driven shaft 30, and the reverse drive shaft 23 (reverse drive is shown in FIG. 3). The drive clutch 28) is connected to the reverse passive clutch 32 for the driven shaft 30.

  The distance between the front frame 13 and the transmission frame 51 is that the transmission frame 51 has finished rotating around the rotation shaft 53 and the forward passive clutch of the driven shaft 30 is driven by the forward drive shaft 22 (forward drive clutch 27). When 31 is going to oppose, it sets so that it may become the distance which can be connected when the forward passive clutch 31 and the forward drive clutch 27 oppose, rotating relatively. The angle formed by the traveling direction of the traveling machine body 100 when the link members 41 to 43 are in a folded state is set so that the distance between the clutches 31 and 27 is relatively rotated.

  It should be noted that when the forward passive clutch 31 and the forward drive clutch 27 are shifted from an angled state to an opposing (no angled) state, a coil spring or the like connected to at least one of the shafts is attached. Since the biasing member absorbs the relative displacement and the relative rotational displacement, the connection can be made smoothly even if contact is started with an angle.

  The agricultural working machine 1 of the present invention is provided with an urging member that assists the rotation of the transmission frame 51 around the rotation shaft 53 and the swinging of the link members 41 to 43 around the support shafts 18 and 20 by manual operation. Yes. In the present embodiment, specifically, the urging member is constituted by a gas spring 91.

  The gas spring 91 is rotatably connected to an attachment piece 93 protruding from the bottom surface of the attachment frame 15 and an attachment piece 92 protruding from the bottom surface of the transmission frame 51. The rotation shaft 53 of the transmission frame 51 is on a straight line (hereinafter referred to as a reference straight line) that passes through the connection point between the mounting piece 93 and the gas spring 91 and is parallel to the axis of the input shaft 4 (the traveling direction of the traveling machine body 100). positioned. Further, when the working unit 50 is in the forward working posture and the backward working posture, the connection point between the mounting piece 92 and the gas spring 91 (hereinafter referred to as the first connection point) is at a distance from the reference straight line. Is inclined with respect to the reference straight line.

  Further, in the present embodiment, the first connection point in the forward working posture and the first connection point in the backward working posture are arranged at symmetrical positions with respect to the reference straight line, and the first connection point of the transmission frame 51 is Since it rotates through the rear side of the agricultural machine 1 with the rotation, the connection point between the attachment piece 92 and the gas spring 91 and the connection point between the attachment piece 93 and the gas spring 91 (hereinafter, the second connection point). ), That is, the extension amount of the gas spring 91 is the minimum in the forward working posture and the backward working posture, and is the maximum at the intermediate point of switching between the working postures (see FIG. 4).

  The gas spring 91 applies a load only outward in the longitudinal direction, and the applied load becomes maximum when the extension amount is minimum, and decreases as the extension amount increases. Therefore, the load applied to the transmission frame 51 by the gas spring 91 is maximized during the forward working posture and the backward working posture, and is minimized at the midpoint of switching between the working postures.

  Therefore, it is necessary to rotate the transmission frame 51 when switching the work posture, but the reference straight line extends from the operation start position (forward work posture or reverse work posture) to the intermediate point of switching between the work postures. Since the direction in which the transmission frame 51 is moved in the direction matches the direction of the load by the gas spring 91, the rotation of the transmission frame 51 is assisted by the gas spring 91. Therefore, the load for the movement is reduced. Therefore, in order to maximize the load of the gas spring 91 at the start position, it is preferable that the extension amount of the gas spring 91 at the operation start position (forward operation posture or reverse operation posture) is the smallest.

  On the other hand, the direction in which the transmission frame 51 is moved in the reference linear direction and the direction of the load by the gas spring 91 are opposite from the intermediate point of switching between the work postures to the operation end position (reverse work posture or forward work posture). Therefore, the gas spring 91 resists the rotation of the transmission frame 51.

  In this case, although it seems that the rotation of the transmission frame 51 is obstructed by the gas spring 91, the transmission frame 51 is supported as a result of the rotation of the transmission frame 51 from the start of operation to the intermediate point of switching between work postures. Is rotated and actually has speed, the transmission frame 51 has kinetic energy and momentum. Therefore, even if the rotation of the transmission frame 51 is prevented by the gas spring 91, the transmission frame 51 resists the resistance force of the gas spring 91 and continues to rotate. Can be safely operated.

  Further, when the working unit 50 shifts from the forward working posture to the retracted posture, the extension amount of the gas spring 91 is minimized during the forward working posture and maximized during the retracted posture (see FIG. 5). Here, the rear end portion of the gas spring 91 is moved from the first link member 41 side to the second link member 42 side with respect to the reference straight line. That is, in the length direction of the transmission frame 51 (rear frame 45), the direction of the load applied to the transmission frame 51 by the gas spring 91 is reversed.

  Since the transmission frame 51 moves in the length direction from the first link member 41 side to the second link member 42 side, the direction in which the transmission frame 51 is moved coincides with the direction of the load by the gas spring 91 at the start of operation. However, when the length direction of the gas spring 91 and the direction of the reference straight line are parallel, the direction in which the transmission frame 51 is moved and the direction of the load by the gas spring 91 are opposite. That is, similarly to switching between work postures, the gas spring 91 reduces the load on the movement of the transmission frame 51 at the start of the operation, and the operation can be performed safely from the middle to the end of the operation.

The top view of the brushing machine of the state which the brushing operation part concerning one embodiment of this invention moved to the advance work position is shown. The rear view of the hulling machine of the state which the haze coating operation part moved to the advance work position is shown. The top view of the hull coating machine of the state which the haze coating operation part moved to the reverse work position is shown. The top view of the coating machine of the state in the middle of the movement (middle point) which reverses a coating process part is shown. FIG. 3 is a plan view of the hull coater in a state in which the hull coater has moved to the storage position. (A) is a top view of a locking member, (b) shows the side view of a locking member.

Explanation of symbols

1 Spider coater (agricultural machine)
DESCRIPTION OF SYMBOLS 10 Mounting part 22,23 Drive shaft 30 Driven shaft 40 Parallel link (link mechanism)
41 First link member (link member)
41b Guide piece 42 Second link member (link member)
43 Third link member (link member)
45 Rear frame 50
51 Transmission frame 52, 53, 54 Rotating shaft 70 Safety device 71 Engaging member 71a Rotating shaft 71b Locking piece 71c Locked portion 72 Engaged member 73 Substrate 73a Rotating shaft 73b Guide hole 73c Release piece 75, 77 Coil Spring 76 Locking member 76a Rotating shaft 81 Engaging pin 82 Front engaged member 83 Rear engaged member 82a, 83a Rotating shaft 82b, 83b Engaged recess 82c, 83c Release piece 84 Release rod 84a Rotating shaft 84b Locking Piece 91 Gas spring 92, 93 Mounting piece 100 Traveling machine body

Claims (2)

A front frame having a mounting portion to be mounted on the rear portion of the traveling machine body, a plurality of link members swingably connected to the front frame, and a rear frame connected to the moving end side of each link member; After that, it is rotatably connected to the frame, and has a transmission frame that supports the working portion at the tip position,
The transmission frame is a safety device for a farm work machine that is rotatable between a forward working position where the working unit is in a forward working posture and a reverse working position where the working portion is in a backward working posture,
A link mechanism comprising the link member and the rear frame, and an engaging member that is spanned between the front frame and has one end engaged with either the link mechanism or the front frame;
A locking member connected to the other of the link mechanism or the front frame and capable of being locked to a locked portion formed at the other end of the engaging member;
The agricultural work characterized in that the locking member can be locked to the locked portion of the engaging member in a direction in which the engagement of the one end is released when the working portion is in a backward working posture. Machine safety device.   The safety device for an agricultural working machine according to claim 1, wherein the locking member is fixed to a rotation shaft of the transmission frame.

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