JP5874106B2 - Transplanter - Google Patents

Description

  The present invention relates to a transplanting machine that drives a planting work machine upward as the traveling machine body moves backward.

  An elastic member that urges the operating body to the side where the planting work machine ascends through the rotating operating body, and the operating body is locked at a non-operating position that is a rotating position that does not act on the operating body. Thus, the lock member that prevents the urging force of the elastic member from being applied to the operating body, and the lock member at the non-operating position of the operating body by releasing the lock when the traveling machine body moves backward is released. A release mechanism for applying an urging force to the operating body, and rotating the operating body to a non-operating position against the urging force of the elastic member as the planting work machine rises to a predetermined height or more. Thus, a transplanter described in Patent Document 1 provided with an automatic lifting mechanism that can automatically drive the planting work machine to lift up in conjunction with reverse switching of the traveling machine body is conventionally known.

Japanese Patent No. 4073778

  However, in the transplanter of the above-mentioned document, the elastic member that biases the operating body to the side on which the planting work machine ascends via the operating body is constituted by a single member, and the biasing force is only in one direction. Since it does not act, there was a problem that it could not be smoothly rotated depending on the magnitude and direction of the biasing force of the elastic member according to the rotational position of the operating body.

  The present invention relates to the transplanting machine in which the operating body is pivoted to the side where the planting work machine is automatically driven to rise by the biasing force of the elastic member in conjunction with the reverse switching of the traveling machine body. It is an object of the present invention to provide a transplanter that arranges an elastic member so that an operating body can be efficiently rotated, and can smoothly rotate the operating body to the side where the planting work machine is raised.

In order to solve the above-described problems, the present invention firstly rotates a planting work machine 6 connected to the traveling machine body 3 through a lifting link 4 so as to be lifted and lowered so as to move the planting work machine 6 up and down. The actuating body 31 that is supported, the elastic member 41 that urges the actuating body 31 to the side on which the planting work machine 6 ascends via the rotating operating body 39, and the elastic force of the elastic member 41 acted. A lock member 42 in which the urging force of the elastic member 41 is not applied to the operating body 31 by locking the operating body 39 in a state at a locking position that is a rotation position that does not act on the operating body 31; A release mechanism 43 that causes the urging force of the elastic member 41 to act on the operating body 31 by releasing the lock of the operating body 39 by the lock member 42 in accordance with the reverse switching of the traveling body 3. 3 planting in conjunction with reverse switching In the transplanter capable of automatically driving the machine 6 up, a pair of springs facing each other with the rotation fulcrum of the operating body 39 in an elastically deformed state when the operating body 39 is rotated to the locked position The elastic member 41 is configured by 41A and 41B, and the pair of springs 41A and 41B are configured such that their width directions overlap in a plan view, and the pair of springs 41A and 41B are configured in a plan view. It is characterized in that it is arranged on the opposite left and right sides of the operating body 39 with respect to the operating body 31 linked to the operating body 39 on the left and right outer sides of the machine body .

  Second, the pair of springs 41A and 41B are arranged so that at least a part of the rotating fulcrum of the operating body 31 wraps within the rotational range of the operating body 31. Yes.

  According to the above configuration, the pair of springs are arranged opposite to each other with the rotation fulcrum of the operating body as an elastic member that biases the operating body so as to rotate the working body to the side where the planting work machine is lifted. By doing so, the biasing force of the spring acts efficiently so as to efficiently rotate the operating body, and the operating body can be smoothly rotated to the side where the planting work machine is lifted. Therefore, it is possible to satisfactorily operate the automatic ascending mechanism that drives the planting work machine up by operating the operating body in conjunction with the reverse switching of the traveling machine body.

  In addition, if the pair of springs are arranged so that at least a part of the rotating fulcrum of the operating body wraps within the rotational range of the operating body, the pair of springs can be arranged more compactly. .

It is the whole riding rice transplanter to which the transplanter of the present invention is applied. It is a whole perspective view which shows a working machine interlocking mechanism. It is a side view of a work machine interlocking mechanism. It is a top view of a working machine interlocking mechanism. It is a front view of a work machine interlocking mechanism. It is a principal part side view which shows the raising / lowering range of a planting work machine. It is a principal part side view which shows the working machine interlocking mechanism at the time of planting. It is a principal part side view which shows the working machine interlocking mechanism of the state which lowered | hung the planting work machine. It is a principal part side view which shows the working machine interlocking mechanism at the time of reverse gear shifting. It is a principal part side view which shows the working machine interlocking mechanism when a working machine lever is automatically operated to a raise position. It is a principal part side view which shows the working machine interlocking mechanism at the time of the raising drive of a planting working machine. It is a principal part side view which shows the pressure accumulation of the tension spring at the time of a raise drive. It is a principal part side view which shows the state by which the working machine lever was operated to the fixed position by the automatic stop mechanism.

Hereinafter, embodiments of the present invention will be described based on illustrated examples.
FIG. 1 is an overall side view of a riding rice transplanter to which a transplanter of the present invention is applied. The riding rice transplanter includes a traveling machine body 3 supported by a pair of left and right front wheels 1, 1 and rear wheels 2, 2, and a planting machine connected to a rear side of the traveling machine body 3 by a hydraulic cylinder via a lifting link 4. An attachment work machine 6 and a horizontal leveling work machine 7 disposed between the planting work machine 6 and the rear wheel 2 are provided.

  The body frame 8 that supports the traveling body 3 is equipped with an engine (not shown) surrounded by a bonnet 9 on the front side, and an operator gets on the rear side of the engine for steering operation and the like. A control unit 11 is provided.

  The steering unit 11 includes a seat 12 on which an operator is seated, a steering handle 13 for steering operation, a floor step 14 below the steering handle 13, a speed change lever 16 for operating a speed change by a speed change mechanism, A brake pedal 17 that operates the brake operation of the machine body 3 and a work machine lever 18 that is guided in the front-rear direction by the guide hole 5 and moves up and down the planting work machine 6 are arranged.

  The planting machine 6 includes a seedling stage 19 on which seedlings to be planted on a farm field are placed, and a planting unit 21 that performs the work of planting seedlings placed on the seedling stage 19 to the field. The leveling work machine 7 includes a square columnar leveling rotor 22. As a result, the riding rice transplanter uses the leveling work machine 7 to level the field that has been rough due to the turning of the machine during the planting operation, and uses the planting work machine 6 to plant seedlings in the field after leveling. It is configured as follows. As a result, the riding rice transplanter uses the leveling work machine 7 to level the field that has been rough due to the turning of the machine during the planting operation, and uses the planting work machine 6 to plant seedlings in the field after leveling. be able to.

  Further, the planting work machine 6 is intermittently connected to power by a planting clutch (not shown) for turning on and off the driving force on the planting work machine 6 side provided on the traveling machine body 3 side or the planting work machine 6 side. Has been done. The planting clutch is turned on and off via the work machine interlocking mechanism 23 by swinging the work machine lever 18 back and forth, so that the driving force of the planting work machine 6 is driven by the work machine lever 18. It is configured to be operated intermittently.

  Further, the planting work machine 6 is lifted and lowered via the lifting link 4 by expansion and contraction of a lifting cylinder 10 made of a hydraulic cylinder (not shown). The telescopic operation of the elevating cylinder 10 is mechanically interlocked with the operation machine lever 18 by swinging back and forth and the work machine interlocking mechanism 23.

FIG. 2 is an overall perspective view showing the work machine interlocking mechanism. The work machine interlocking mechanism 23 shown in the figure is
The planting work machine 6 is lowered by swinging the work machine lever 18 forward (downward), and the planting work machine 6 is operated by swinging the work machine lever 18 backward (upward). Is configured to rise.

  Further, the work machine interlocking mechanism 23 operates the work machine lever 18 to the raised position on the rear work machine ascending side to raise the planting work machine 6, and the planting work machine 6 is moved to a predetermined lift position. Then, the work implement lever 18 is automatically returned from the raised position to the front side, and the lever return mechanism that elastically positions the work implement lever 18 at a fixed position which is a fixed hole 5a formed at the right side of the front and rear intermediate position of the guide hole 5. Thus, an automatic stop mechanism for fixing the planting work machine 6 at a predetermined height is provided.

  Further, the work implement interlocking mechanism 23 automatically switches the work implement lever 18 to the rear side by switching the reverse movement of the speed change lever 16 to cut off the driving of the planting work implement 6 and the planting work implement 6. An automatic raising mechanism for automatically raising is provided. Hereinafter, the configuration of the work machine interlocking mechanism 23 will be described.

  Next, the working machine interlocking mechanism will be described with reference to FIGS. 3 to 5 are a side view, a plan view, and a front view of the work machine interlocking mechanism. As shown in the figure, the work implement interlocking mechanism 23 is attached to the work implement lever 18 and the base end portion side of the work implement lever, and is attached to the working cam lever (operating member) so as to rotate integrally with the work implement lever. ) 31 and a pivot shaft extending in the left-right direction that is pivotally supported so as to pass through an inverted U-shaped support member 33 attached to the traveling machine body 3 side. 34, and a contact pin 36 provided on a valve arm 38 for operating a hydraulic valve 37 for supplying and discharging hydraulic pressure to and from the elevating cylinder 10 and contacting the operating cam 31.

  The work implement interlocking mechanism 23 is a forearm that is pivotally supported about the pivot shaft 34 as a fulcrum and extends forward of the pivot shaft 34 as the automatic raising mechanism 31 as the automatic raising mechanism. The working machine lever 18 is swung backward via the operating cam 31 by urging the rotating arm 39, which is formed with a 39 a and a rear arm 39 b extending rearward, and the rotating arm 39. An upper spring 41A and a lower spring 41B, which are a pair of upper and lower tension springs (elastic members) 41 operated sideways, and a lock member 42 that locks the rotation arm 39 biased by the tension spring 41 so as not to rotate. And a release mechanism 43 for releasing the lock of the rotating arm 39 by the lock member 42, and the urging force is accumulated in the tension spring 41 as the planting work machine 6 is lifted. Thereby pivoting the arm-side link and an (operating side interlocking link) 44.

  Further, the work implement interlocking mechanism 23 constitutes a lever return mechanism that operates the work implement lever 18 from the raised position to the fixed position when the planting work implement 6 is raised to a predetermined position as the automatic stop mechanism. An operating cam side link (operating body side interlocking link) 46 for automatically operating the operating cam 31 is provided.

  The work machine lever 18 is formed with a horizontal portion 18a by inclining the grip portion side toward the outer side of the traveling machine body and bending the middle part toward the inner side of the traveling machine body in an L shape. The middle part of the horizontal portion 18a is attached to the traveling machine body side, and the bent part side (outside the traveling machine body) is biased downward by the lever spring 47 from the attachment position. Thereby, the work machine lever 18 is always urged toward the outside of the traveling machine body 3. Further, the work machine lever 18 is provided with a U-shaped attachment member 20 having an open lower side on the bent portion side, and is configured to rotate integrally with the rotation shaft 34 sandwiched by the attachment member 20. Installed on.

  The operating cam 31 has a front fan-shaped part 48 and a rear fan-shaped part 49 formed in a fan shape on the front side and the rear side of the rotating shaft 34, and the lower side of the rear fan-shaped part 49. The contact part 51 is extended. The contact pin 36 is disposed on the front side of the contact portion 51 so as to contact.

  Further, the contact pin 36 is disposed on the front side of the contact portion 51 of the operating cam 31, and a valve arm 38 that is rotated by contacting the contact pin 36, and the valve arm 38 is operated. The hydraulic valve 37 is provided on the left and right inner sides (traveling machine body side) of the operating cam 31. Therefore, when the contact portion 51 of the operating cam 31 rotates forward in accordance with the operation of the work machine lever 18 to the raised position side (rear side), the contact pin 36 that contacts the contact portion 51 moves forward. The hydraulic valve 37 is operated through a valve arm 38 by swinging to the side.

  The front fan-shaped portion 48 of the operating cam 31 is a circle centered on the rotating shaft 34 so that the rotating arm 39 can rotate independently of the operating cam 31 within a predetermined range. An arc-shaped front interchange hole 48a is formed. Further, the rear fan-shaped portion 49 of the working cam 31 is formed with an arcuate rear accommodation hole 49a that is connected to the working cam side link 46 and that is centered on the rotation shaft 34.

  The rotating arm 39 is pivotally supported by the rotating shaft 34 on the outer side in the left-right direction (right side in the illustrated example, the right side in the following) from the operating cam 31. That is, since the rotation arm 39 and the operation cam 31 rotate about the same rotation shaft 34, the range of the rotation operation in a side view is surely wrapped.

  Further, on the end side of the front arm 39a, a front interchangeable pin 52 is provided that protrudes to the left and right inner sides (left side in the illustrated example, left side in the following example), which is the operation cam 31 side. The operation cam 31 is inserted through a front interchange hole 48a.

  In the vicinity of the front interchangeable pin 52 of the front arm 39a, a front arm side locking pin 53 is provided projecting toward the right side so that one end of the upper spring 41A is locked. The other end side of the upper spring 41A is on the traveling machine body 3 side and is locked by a machine body side locking pin 54A provided on the upper rear side of the rotating shaft 34 (actuating cam 31). Is provided above the fulcrum of the rotation shaft 34 (hereinafter referred to as a rotation fulcrum). As a result, the upper spring 41A urges the end side of the front arm 39a toward the rear upper side of the rotation fulcrum so that the rotation arm 39 rotates counterclockwise when viewed from the right side. It is fast.

  On the other hand, a rear arm side locking pin 56 is provided projecting from the end side of the rear arm 39b toward the right side so that one end side of the lower spring 41B is locked. The other end side of the lower spring 41B is the traveling machine body 3 side, and is locked by a machine body side locking pin 54B provided on the lower front side of the rotating shaft 34 (the operation cam 31). The side spring 41B is provided below the rotation fulcrum. As a result, the lower spring 41B biases the end side of the rear arm 39b toward the front lower side of the rotating shaft 34 so that the rotating arm 39 rotates counterclockwise when viewed from the right side. Energized.

  Accordingly, the upper spring 41A and the lower spring 41B are arranged so as to face each other with the rotation fulcrum of the rotation shaft 34 interposed therebetween, and are provided so that the urging force acts in the opposite direction. Accordingly, the upper spring 41A and the lower spring 41B can efficiently rotate the rotating arm 39, so that the rotating arm 39 moves the work implement lever 18 rearward at once by the urging force of the tension spring 41. Since the urging force of the tension spring 41 can be suppressed to the minimum necessary, the operability to the rear side of the work implement lever by manual operation is improved, and the assembly work of each tension spring 41 is improved. Will also be easier.

  Further, since the upper spring 41A and the lower spring 41B are arranged so that most of them are within the rotation range of the operation cam 31 in a side view, the tension springs 41 are arranged in a compact manner.

  The lock member 42 is pivotally supported by a lock shaft 42 a provided on the traveling machine body 3 side and on the lower rear side of the rotation shaft 34, and a base end of the rear arm side locking pin 56. It comes into contact with a lock portion 57 formed so that the side is thicker than the tip side. Specifically, the lock member 42 extends upward from the lock shaft 42 a, and a lock abutting portion 42 b that is cut out in an L shape is formed on the upper front side that abuts the lock portion 57. As a result, the lock portion 57 of the rear arm 39 b urged downward by the tension spring 41 and the lock contact portion 42 b of the lock member 42 abut, and the rotation of the rotating arm 39 urged by the tension spring 41 is rotated. Restrict movement.

  The lock member 42 is provided with a lock spring 58 that urges the lock member 42 toward the rotating arm 39. The lock member 42 has an overhang portion 42c extending toward the rear side of the lock shaft 42a, and a lock side locking pin 59 projects from the overhang portion 42c. The lower end side of the locking spring 58 is engaged with the locking side locking pin 59, and the upper end side of the locking spring 58 is provided on the traveling machine body 3 side and on the upper front side of the overhanging portion 42c. It is locked to the machine body side locking pin 54C. As a result, the lock member 42 is urged by the lock spring 58 so as to rotate clockwise in a right side view.

  The release mechanism 43 is constituted by a wire 61 that releases the contact between the lock contact portion 42 b of the lock member 42 and the lock portion 57 of the rotating arm 39 by swinging the lock member 42 backward. The wire 61 includes an inner wire 63 that connects the lock-side locking pin 59 of the lock member 42 and an interlocking portion 62 provided on the base end side of the speed change lever 16, and an inner wire 63 that houses the inner wire 63. And an outer 64 fixed to the third side.

  At this time, when the speed change lever 16 is moved backward, the inner wire 63 is configured to pull the lock side lock pin 59 downward, so that the lock side lock pin is interlocked with the reverse shift of the speed change lever 16. When 59 is pulled downward, the lock member 42 slightly rotates counterclockwise in the right side view against the urging force of the lock spring 58. Thereby, the contact between the lock contact portion 42b of the lock member 42 and the lock portion 57 of the rotating arm 39 is released.

  Therefore, when the lock mechanism 42 is unlocked by the release mechanism 43, the rotation arm 39 urged by the tension spring 41 to rotate counterclockwise as viewed from the right side is rotated according to the urging force. It becomes possible.

  As shown in FIG. 2, the interlocking portion 62 is connected to the end portion of the inner wire 63 on the side of the speed change lever 16, and is provided with a rotation fulcrum 55 on the upper side of the connection portion. A swing plate 60 extending toward the left side in the left-right direction, and a guide member 65 formed with a guide portion 65a extending forward from a middle part in the left-right direction of the swing plate 60 are provided. Yes.

  The rocking plate 60 is formed with an abutment guide 60 a extending forward so as to be parallel to the guide portion 65 a on the left side of the guide member 65. It is configured to be disposed between the 60 abutment guides 60 a and the guide portion 65 a of the guide member 65. The guide member 65 is fixed to the traveling machine body side.

  Further, the shift lever 16 is moved forward and backward by swinging back and forth. However, in the neutral position, the shift lever 16 is configured to swing in the left-right direction. When performing the reverse operation), it is necessary to swing the shift lever 16 backward while swinging the shift lever 16 to the left (not shown). Thereby, an erroneous operation can be prevented.

  As a result, when the shift lever 16 is reversely switched from the neutral position, the shift lever 16 is swung to the left, whereby the base end side of the shift lever 16 is brought into contact with the contact guide 60a and pushed out to the left to swing. The contact guide 60 a side of the plate 60 is swung downward about the rotation fulcrum 55. Therefore, when the shift lever 16 is operated backward, the inner wire 63 connected to the lower right side of the rotation fulcrum 55 is pulled upward, and the end of the inner wire 63 on the release mechanism 42 side moves the lock member 42 downward. It is comprised so that it may pull on.

  The pivot arm side link 44 is disposed on the base end side of the lower link 66 constituting the elevating link 4 and extends to the front side of the swing shaft 67 pivotally supported in the left-right direction. A front connecting portion 68 that swings up and down as the swinging shaft 67 rotates, and a connecting rod 69 that connects the end side of the front connecting portion 68 and the rotating arm 39 are provided. Yes.

  The connecting rod 69 is connected between the front end portion of the front arm 39a and the rotating shaft 34. The connecting rod 69 includes an upper rod 69a whose upper end is connected to the rotating arm 39 side, a lower rod 69b whose lower end is connected to the front connecting portion 68 side, a lower end of the upper rod, and an upper end of the lower rod. It is comprised from the sleeve-like connection tool 69c inserted and fixed.

  The pivot arm side link 44 has the swinging shaft 67 rotated in the forward rotation direction as the planting work machine 6 is lifted, and the front connecting portion 68 is moved downward as the swinging shaft 67 is rotated forward. The connecting rod 69 is pulled downward as the front connecting portion 68 swings downward, and the rotating arm 39 is rotated clockwise as viewed from the right side as the connecting rod 69 moves downward. The Thus, when the pivot arm 39 is pivoted via the pivot arm side link 44, the upper spring 41A and the lower spring 41B are extended so that the pivot shaft 34 is sandwiched between the upper and lower springs 41A. Placed in.

  At this time, one end side of the connecting rod 69 is connected to a position closer to the rotating shaft 34 than the end portion side of the front arm 39a, whereby the end side of the rotating arm 39 is more than the amount of movement of the connecting rod 69. Can be moved more greatly, so that the rotating arm 39 can be efficiently rotated.

  The working cam side link 46 extends from the swing shaft 67 and the rear upper side of the swing shaft 67 and swings up and down as the swing shaft 67 rotates. And a rod 72 that extends from the end side of the rear connecting portion 71 toward the operating cam 31 and is connected to the rear fan-shaped portion 49.

  The rod 72 is provided with a rear interchangeable pin 73 on the end side, and the rear interchangeable pin 73 is inserted into the rear interchangeable hole 49 a formed in the rear fan-shaped portion 49, thereby operating cams. A side link 46 is connected to the operating cam 31. That is, the operating body 31 has a front fan-shaped portion 48 connected to the rotating arm 39 and a rear fan-shaped portion 49 connected to the operating cam side link.

  The rod 72 includes a bent portion 72a having a rear interchangeable pin 73 attached to the upper end side and a lower end side bent into an L shape, a fixed portion 73b fixed to the rear connecting portion 71, and the fixed portion 72b. And a connecting screw 72c that is slidably connected to the bent portion 72a and adjusts the connecting position of the connecting screw 72c and the bent portion 72a, thereby adjusting the overall length of the rod 72. it can.

  Thereby, when the planting work machine is lifted from a predetermined position by the lever return mechanism, the operation cam 31 is pushed forward through the rod 72, and the work machine lever 18 is operated to the fixing hole 5a. Thereby, the planting work machine 6 stops. In addition, by adjusting the length of the rod 72, the raised position of the planting work machine 6 where the operation of the work machine lever 18 is started can be easily adjusted.

  In addition, even if the rod 72 is operated by the raising / lowering drive of the planting work machine 6 in a state where the rod 72 is connected to the operation cam 31, within the range in which the rear accommodation pin 73 slides within the rear accommodation hole 49a, The operating cam 31 is not operated. Similarly, when the operation cam 31 (working machine lever 18) is operated in a state where the planting work machine 6 is fixed, the rod within the range in which the rear accommodation pin 73 slides within the rear accommodation hole 19a is also used. No operating force works on the 72 side.

  Both the pivot arm side link 44 and the actuation cam side link 46 are linked separately from the forward rotation of the swing shaft 67 when the planting work machine 6 rises above a predetermined position (interlocking means). ). Accordingly, since the accumulation of the urging force to the tension spring 41 and the stoppage of the planting work machine that has risen to the predetermined position are operated by separate links, the planting work machine 6 is raised to a predetermined height or more. The rotation operation of the rotation cam 39 to the lock position (non-operation position) by the rotation arm side link 44 and the rotation operation of the operation cam 31 by the operation cam side link 46 are performed simultaneously. It is possible to effectively utilize the lifting range of the planting work machine.

  With the above-described configuration, when the work implement lever 18 is swung backward, the contact portion 51 of the operating cam 31 is swung forward, and accordingly, the corresponding contact portion 51 is moved to the contact pin 36. And the hydraulic valve 37 is operated via the valve arm 38. As a result, oil is supplied from the hydraulic pump (not shown) to the lifting cylinder 10 side, the lifting cylinder 10 is extended, and the planting work machine 6 is lifted via the lifting link 4.

  On the other hand, when the work implement lever 18 is swung forward, the abutting portion 51 of the operating cam 31 is swung back, and accordingly, the contact portion 51 and the abutting pin 36 are brought into contact with each other. The connection is released. As a result, the dead weight of the planting work machine 6 drains oil from the lifting cylinder 10 and the hydraulic pump, the lifting cylinder 10 is contracted, and the planting work machine 6 is lowered via the lifting link 4. Further, when the working machine lever 18 is swung forward to the planting work position which is the foremost position, the planting clutch is engaged and the planting work machine is driven.

  Next, based on FIG. 6 thru | or 13, the cooperation of the automatic raising mechanism comprised as mentioned above and an automatic stop mechanism is demonstrated. 6 is a main part side view showing the work machine interlocking mechanism at the time of planting work, and FIG. 7 is a main part side view showing the work machine interlocking mechanism in a state where the planting work machine is lowered. FIG. 9 is a main part side view showing the work machine interlocking mechanism when the reverse gear is shifted, and FIG. 9 is a main part side view showing the work machine interlocking mechanism when the work machine lever is automatically operated to the raised position; FIG. 10 is a main part side view showing a work machine interlocking mechanism when the planting work machine is driven up, FIG. 11 is a main part side view showing pressure accumulation of the tension spring during the up drive, and FIG. FIG. 4 is a side view of the main part showing a state where the work implement lever is operated to the fixed position by the automatic stop mechanism.

  First, the automatic raising mechanism will be described with reference to FIGS. In the state where the shift lever 16 is operated forward, as shown in FIG. 6, when the work implement lever 18 is operated to the planting work position which is the foremost position, the planting work implement 6 is moved to the field position. At the same time, the planting clutch of the planting work machine 6 is turned on to drive the planting work machine 6 so that the planting work can be performed.

  At this time, the front interchangeable pin 52 of the rotating arm 39 is in contact with the upper end of the front interchangeable hole 48a of the operating cam 31, and the rear interchangeable pin 73 of the rod 72 is on the lower end side of the rear interchangeable hole 49a of the operational cam 31. Since the contact pins 52 and 73 are slid in the connection holes 48a and 49a, only the work machine lever 18 and the operation cam 31 are operated rearward (upward), so that the planting work machine 6 It can be raised and the planting clutch can be turned off.

  That is, as shown in FIG. 7, when the working machine lever 18 is operated from the planting work position to the fixed position of the fixing hole 5a, the planting clutch is disengaged and the driving of the planting work machine 6 is stopped.

  Next, when the traveling body 3 is stopped from the state shown in FIG. 6 or 7 to perform turning or the like, when the speed change lever 16 is operated in reverse, as shown in FIG. The lock member 42 is pulled downward against the urging force 58 to rotate downward, and the contact between the lock contact portion 42 b of the lock member 42 and the lock portion 57 of the rotation arm 39 is released.

  As a result, as shown in FIG. 9, the rotating arm 39 is rotated counterclockwise as viewed from the right side by the urging force stored by the upper spring 41A and the lower spring 41B. In the rotating arm 39, when the front accommodation pin 52 reaches the upper end of the front accommodation hole 48a and the urging force is further applied, the rotation arm 39 moves the work implement lever 18 to the rearmost position via the operation cam 31 ( It swings automatically to the highest position, which is the upper position. Thereby, as shown in FIG. 10, the planting work machine 6 is driven up.

  Note that by switching the shift lever 16 to the forward side, the lock member 42 returns to the position where the rotating arm 39 is locked by the urging force of the lock spring 58.

  Next, as shown in FIG. 11, when the planting work machine 6 is raised to a predetermined height, the connecting rod 69 is operated downward via the rotating arm side link 44. When the connecting rod 69 is operated downward, the pivoting arm 39 rotated counterclockwise as viewed from the right side by releasing the urging force of the upper spring 41A and the lower spring 41B is used as the upper spring 41A and the lower spring 41B. The rotating arm 39 is rotated clockwise against the urging force, and the urging force is accumulated in the tension spring 41 again.

  Further, when the rotating arm 39 rotates clockwise against the urging force of the tension spring 41, the lock portion 57 of the rotating arm 39 and the lock member 42 come into contact with each other. The lock member 42 restricts the rotation arm 39 from rotating by the urging force newly stored in the tension spring 41.

  That is, when the reverse operation is performed by the speed change lever 16, the working machine lever 18 is moved to the raised position by using the biasing force of the tension spring 41 that has been deformed in advance and the biasing force is stored, and the planting work machine 6 is lifted. Then, the planting machine 6 deforms the tension spring 41 as it rises and accumulates the urging force again (automatic lifting mechanism).

  Next, the automatic stop mechanism will be described with reference to FIG. 12. When the planting work machine 6 is raised to a predetermined height, the push plate 66a of the lower link 66 is moved to the lower end of the fixing portion 72b of the rod 72 of the operating cam side link 46. Push up toward the front upper side. As a result, the rod 72 operates the work implement lever 18 to the front side via the operation cam 31, and thus the work implement lever 18 can be automatically operated to the fixed position. That is, when the planting work machine 6 rises to a predetermined height, the planting work machine 6 is automatically operated to a predetermined position where the raising of the planting work machine 6 stops (automatic stop mechanism).

  FIG. 13: is a principal part side view which shows the raising / lowering range of a planting work machine. From the figure, a range X indicates the maximum lifting range of the planting work machine, and a range Y indicates an automatic lifting range in which the planting work machine is automatically lifted according to the farm scene. A range Z ′ indicates a range in which the urging force is accumulated on the tension spring 41 as the planting work machine 6 is lifted. The range Z is a work machine lever 18 as the planting part is lifted to a predetermined position. The operating range of the lever return mechanism for returning the lever to the fixed position is shown.

  With the above-described configuration, the urging force is efficiently accumulated on the tension spring 41 by the automatic raising mechanism, so that the range Y can be widened and the planting work machine 6 can be used even when planting in a deep field. Because it is possible to perform automatic lifting and lowering, it is highly convenient.

3 traveling machine body 4 lifting link 6 planting work machine 31 operating cam (operating body)
39 Rotating arm (operating body)
41 Tension spring (elastic member)
41A Upper spring (a pair of springs)
41B Lower spring (a pair of springs)
42 Locking member 43 Release mechanism

Claims (2)

A planting work machine (6) connected to the traveling machine body (3) via a lifting link (4) so as to be able to be lifted and lowered, and an operation supported so as to be able to move the planting work machine (6) up and down. An elastic member (41) for urging the operating body (31) to the side on which the planting work machine (6) ascends via the body (31), the rotating operation body (39), and the elastic member (41) The operating body (39) in a state where the elastic force is applied is locked at a lock position that is a rotational position that does not act on the operating body (31), whereby the urging force of the elastic member (41) is applied to the operating body. By releasing the lock at the lock position of the operation body (39) by the lock member (42) and the lock member (42) in reverse movement switching with the lock member (42) that is not applied to (31) A release mechanism (43) for applying an urging force of the elastic member (41) to the operating body (31); In the transplanting machine that can automatically drive the planting work machine (6) in conjunction with the reverse switching of the traveling machine body (3), when the operating body (39) is rotated to the locked position, The elastic member (41) is constituted by a pair of springs (41A, 41B) facing each other with the rotation fulcrum of the operating body (39) in an elastically deformed state , and the pair of springs (41A, 41B) The pair of springs (41A, 41B) are configured to overlap with each other in the plan view, and the pair of springs (41A, 41B) are linked to the operating body (39) on the left and right outer sides of the machine body in a plan view. On the other hand, the transplanter arranged on the opposite side of the operation body (39) .   The pair of springs (41A, 41B) are arranged such that at least a part of the rotating fulcrum of the operating body (31) wraps within a rotating range of the operating body (31). The transplanter according to 1.

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