JP4636624B2 - Seedling transplanter - Google Patents

Description

  The present invention relates to a seedling transplanting machine in which seedlings such as sweet vine seedlings are planted in a field.

Conventionally, this kind of seedling transplanter, for example, as described in Patent Documents 1 and 2 as the prior art, seedlings placed on the upper surface of the endless transport body at predetermined intervals on the traveling machine body The seedling transport mechanism that transports the seedlings so that they approach the field one by one by intermittent feeding, and the seedling transport mechanism that stops the seedling transporting mechanism so that the seedling transport mechanism stops intermittent seedling feeding , A seedling planting mechanism that is planted on the field by intermittent reciprocation in the vertical direction is provided.
JP 2005-80620 A JP 2006-87369 A

  In this conventional seedling transplanter, the drive shaft for the seedling transport mechanism is configured to rotate intermittently by an intermittent rotation mechanism that uses an engine as a power source. The seedling transport mechanism is configured such that a chain is wound between at least one guide shaft around which the transport body is wound, and intermittent rotation of the drive shaft is transmitted to the one guide shaft through the chain. It is comprised so that intermittent feed of the endless conveyance body in may be performed.

  However, such an intermittent feed structure with intermittent rotation of the drive shaft and chain transmission from this drive shaft makes the structure extremely complex and considerably increases in size by using the intermittent rotation mechanism and chain. , There was a problem that the weight increased significantly.

  This invention makes it the technical subject to aim at simplification of the mechanism which intermittently feeds the endless conveyance body in a seedling conveyance mechanism in the said seedling transplanter.

In order to achieve this technical problem, claim 1
“A seedling transport mechanism that transports seedlings placed on the upper surface of the endless transport body at predetermined intervals onto the traveling machine one by one by intermittent feeding in the endless transport body, and the seedling transported by this seedling transport mechanism is lowered In a seedling transplanting machine, which is equipped with a seedling planting mechanism so that it can be planted in the field
Between the at least one guide shaft around which the endless transport body is wound in the seedling transport mechanism and the rotary body that is rotatably fitted to the endless transport body, only the rotation of the rotary body in one direction is used as the guide shaft. While providing a one-way clutch for transmission, a flexible linear body having one end connected to an elastic means is wound around the rotating body, and the other end of the flexible linear body is connected to a power source. A crankpin provided eccentrically on the rotating drive shaft is connected so as to release the tension after being pulled against the elastic means during one rotation of the drive shaft. "
It is characterized by that.

Claim 2
“In the first aspect of the present invention, the rotating body is provided with means for preventing the rotating body from rotating in the direction opposite to the feeding direction of the endless transport body.”
It is characterized by that.

Claim 3
“In the first or second aspect of the present invention, a lever pivotally attached to the lever is provided, and the other end of the flexible linear body and the crank pin of the drive shaft are connected to the lever. . "
It is characterized by that.

Claim 4
“In any one of claims 1 to 3, the elastic means is a tension spring in which a wire is wound in a coil shape.”
It is characterized by that.

Claim 5
“In any one of claims 1 to 4, the flexible linear body is provided with a spring force adjusting means.”
It is characterized by that.

  In the configuration described in claim 1, the flexible linear body wound around the rotatable rotating body around the guide shaft of the endless conveying body in a direction against the elastic means at one end thereof during one rotation of the driving shaft. By reciprocating so as to return to the original position by the elastic means after moving, the rotating body reciprocates within a predetermined rotation angle range.

  Of the reciprocating rotation, only rotation in one direction is transmitted to the guide shaft via the one-way clutch, and the guide shaft is rotated in one direction by a predetermined rotation angle. can do.

  On the other hand, since a one-way clutch exists between the rotating body and the guide shaft, the endless transport body can be manually fed freely in the predetermined intermittent feeding direction by manual operation. .

  That is, according to the present invention, the intermittent feed of the endless transport body in the seedling transport mechanism does not depend on the intermittent rotation mechanism with respect to the drive shaft and the chain transmission from the drive shaft to the guide shaft as in the prior art. Since the flexible linear body can be pulled with a simple rotation, the endless transport body can be greatly reduced in size while allowing manual feed to be freely performed. The weight can be greatly reduced.

  In this case, with the configuration according to the second aspect, the rotation of the rotating body in the feeding direction of the endless transport body can always be performed at the same angle, so that the reliability of intermittent feeding can be improved.

  By the way, the stroke when reciprocating the flexible linear body is caused by the crank radius from the rotation center of the drive shaft to the crankpin.

  Therefore, by adopting the configuration described in claim 3, the length from the rotation center of the lever to the connection point to the other end of the flexible linear body, and the distance from the rotation center of the lever to the connection point to the crank pin are provided. By appropriately changing the ratio to the length, the crank radius can be arbitrarily increased or decreased under the condition that the predetermined reciprocating stroke can be obtained. In this case, the driving power can be reduced, while in the former case, the crank mechanism can be reduced in size and weight.

  In particular, the structure described in claim 4 can reduce the size and weight of the elastic means, and the structure described in claim 5 can rotate the flexible linear body. The contact pressure on the body can be adjusted by the spring force adjusting means so as to be held substantially constant against the deformation of the flexible linear body and the tension spring. Intermittent feeding of the endless carrier can be made more reliable.

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

  The seedling transplanting machine 1 shown in these figures is a walking type self-propelled working machine in which vine seedlings in sweet potatoes are planted at regular intervals with respect to the straw while traveling along the straw in the field. , A pair of left and right front wheels 2 and rear wheels 3 traveling on both sides of the saddle, and a traveling machine body 4 supported by the front wheels 2 and the rear wheels 3 so as to be located above the upper surface of the saddle. .

  In the traveling machine body 4, a front engine frame 6 on which an engine 5 is mounted, a central transmission case 7 that receives power from the engine 5, and a rear handle frame 8 are connected and fixed in the front-rear direction. Various devices to be described later are attached to the traveling machine body 4.

  That is, the traveling machine body 4 includes, as the various devices, a heel guide mechanism 9, a front wheel support mechanism 10, a rear wheel support mechanism 11, a heel height detection mechanism 12, a seedling transport mechanism from the front to the rear in the traveling direction. 13, a seedling planting mechanism 14, a pressure suppressing mechanism 15, and a driving operation unit 16 are mounted.

  The cocoon guide mechanism 9 is a device for guiding the traveling direction of the seedling transplanter 1 that travels along the cocoon, and includes a pair of left and right cocoon guide rollers 9a for contacting the left and right side surfaces (slopes) of the cocoon. ing. By controlling the seedling transplanter 1 by operating the seedling transplanter 1 by driving the seedling transplanter 1 in this state by sandwiching the cage between these rod guide rollers 9a, 9a or rolling it while contacting the slope. It is possible to run along the fence without having to.

  The front wheel support mechanism 10 and the rear wheel support mechanism 11 are configured to freely move the traveling machine body 4 up and down relative to the front wheels 2 and the rear wheels 3, of which the rear wheel support mechanism 11 includes the A power transmission mechanism from the transmission case 7 to both the rear wheels 3 is provided, and is configured to travel forward by driving rotation of both rear wheels 3.

  The engine frame 6 of the traveling machine body 4 is provided with a single-acting hydraulic cylinder 17 for moving the traveling machine body 4 up and down relative to the front wheels 2 and the rear wheels 3. Is related to the lift lever 18 provided on the handle frame 8, and when the lift lever 18 is operated to the rear body raising position, the seedling transport mechanism 13, the seedling planting mechanism 14 and the pressure suppressor are operated from the mission case 7. With the power transmission to the mechanism 15 turned off, the hydraulic cylinder 17 operates to raise the traveling machine body 4 to the highest position, and when the elevating lever 18 is operated to the front machine lowering position, With the power transmission from the mission case 7 to the seedling transport mechanism 13, the seedling planting mechanism 14 and the pressure reducing mechanism 15 turned on, the hydraulic cylinder 17 is operated as a traveling body. It operates to descend and is configured so as to have a predetermined planting work state.

  The seedling planting depth in this seedling planting operation state is based on the detection of the cocoon height by the cocoon height detection mechanism 12, and the cocoon height detection mechanism 12 has a configuration as shown in FIG. The sensor roller 12a is in contact with the upper surface of the cocoon, and the sensor arm 12b is rotatably provided on the engine frame 6 to support the sensor roller 12a. The planting depth is configured to be kept substantially constant.

  Next, the seedling transport mechanism 13 will be described. As shown in FIGS. 3 and 4, the seedling transport mechanism 13 is configured separately from the traveling machine body 4, and can be attached to the traveling machine body 4 after assembly. The seedling transport mechanism 13 is disposed behind the mission case 7 and above the handle frame 8.

  The seedling transport mechanism 13 is configured to be driven by the rotation of the drive shaft 19 output from the mission case 7, and the seedling transport mechanism 13 includes a left and right side of the traveling machine body 4 as shown in FIG. A conveyance belt (endless conveyance body) 22 is provided that is wound between a pair of left and right guide shafts 20 and 21 that are disposed so as to extend in the front-rear direction at both sides.

  A plurality of seedling storage portions 23 are provided on the outer peripheral surface of the transport belt 22 at intervals of a predetermined pitch P in the longitudinal direction of the transport belt 22. A grip portion 24 is provided for holding A detachably.

  The conveyor belt 22 is intermittently provided at intervals of the pitch P of each seedling accommodating part 23 in the direction indicated by the arrow B when an operator supplies the seedling A to be placed on each seedling accommodating part 23 on the upper surface side. In the intermittent feed in the direction of the arrow B, the vine seedling A is conveyed to the two guide rollers 25 located at the approximate center of the lower surface. A vine seedling A supplied to each seedling container 23 is prevented from dropping from the seedling container 23 on the outer side of the section of the conveyor belt 22 from the one guide shaft 20 to the both guide rollers 25. A guide plate 26 for holding is provided.

  The seedling planting mechanism 14 uses the power output from the mission case 7 to move between the two guide rollers 25 in the seedling transporting mechanism 13 and the straw in the field, as indicated by a two-dot chain line in FIG. A pair of right and left planted bodies 27 that reciprocate in the vertical direction along the upper and lower sides, and when the planted body 27 is located at the upper limit, the two guide rollers 25 are intermittently fed by the conveyor belt 22. When the vine seedling A is sent to the place of the vine, when the intermittent is stopped, the vine seedling A is picked and moved downward to plant the vine seedling A so that it is pushed into the pod. , When returning to the original ascending position, the conveying belt 22 is intermittently fed by one pitch P so as to be interlocked with the intermittent feeding of the conveying belt 22.

  Moreover, the said suppression body 15 is equipped with the suppression body 15a which moves up and down in response to the reciprocation to the up-down direction in the planting body 27 of the said seedling planting mechanism 14, and the said planting body 27 pushes the vine seedling A into the cocoon. When the lifter moves upward after finishing the above, the pressure-reducing body 15a is configured to press and harden the planting location of the vine seedling A in the heel by the downward movement.

  In the present invention, when the conveying belt 22 in the seedling conveying mechanism 13 is intermittently fed in the direction of the arrow B at an interval of the pitch P of the seedling accommodating portion 23, as described below, FIG. The configuration shown in FIG. 7 is adopted.

  That is, a rotating body 28 is rotatably fitted on one guide shaft 20 of the left and right guide shafts 20, 21 around which the conveyor belt 22 is wound, and the rotating body 28 and the one guide shaft 20. Between the two, a one-way clutch 30 is provided.

  The one-way clutch 29 includes a clutch body 30 that is keyed in a state of being fitted on the one guide shaft 20, and three claw pieces 31 are arranged at 120 degrees in the circumferential direction on the outer periphery of the clutch body 30. The rotation angle of 120 degrees is set to be equal to the interval of 1 pitch P in the conveyor belt 22.

  On the other hand, on the rotating body 28, a pin 33 detachably engaged with at least one of the three claw pieces 31 by sliding with a semicircular spring 32 attached thereto slides freely in the radial direction. When the rotating body 28 rotates in the intermittent feed direction indicated by the arrow B of the conveyor belt 22, this rotation is transmitted to the clutch body 30 via the pin 33, and the one guide When the shaft 20 rotates in the direction of the arrow B and the rotating body 28 rotates in the direction opposite to the arrow B, the pin 33 rides on the rear inclined surface of the claw piece 31 of the clutch body 30, thereby The guide shaft 20 is configured such that the rotation of the rotating body 28 in the reverse direction is not transmitted.

  In FIG. 7, reference numeral 34 denotes a leaf spring body as an example of means for preventing the one guide shaft 21 from rotating in the direction opposite to the arrow B.

  A flexible linear body 35 such as a wire formed by twisting thin metal wires is wound around the outer peripheral surface of the rotating body 28, and one end 35a of the flexible linear body 35 is connected to the seedling supply mechanism. The support frame 36 and the like 13 are engaged with each other via a tension spring 37 in which a wire material, which is an example of elastic means, is wound in a coil shape, while the other end 35b is connected to the support frame 36. An end 39a of a lever 39 pivotally attached to a pin 38 by means of a pin 38 is attached via a spring force adjusting means 40 that adjusts the spring force in the tension spring 37 by adjusting the length. To do.

  The spring force adjusting means 40 can be provided between the tension spring 37 and one end of the flexible linear body 35 or between the tension spring 37 and the support frame 36.

  A crank disk 41 is fixed to the drive shaft 19 with respect to the seedling supply mechanism 13, and a crank pin 42 is provided at a position eccentric from the rotation center of the crank disk 41. By connecting the other end 39b of the lever 39 via the rod 43, the flexible linear body 35 is resisted against the tension spring 37 during the rotation of the drive shaft 19 by the rotation of the drive shaft 19. After the rotary body 28 is pulled so as to rotate by 120 degrees, the pull is released.

  That is, due to the rotation of the drive shaft 19, the flexible linear body 35 is pulled so as to rotate the rotating body 28 by 120 degrees against the tension spring 37 during one rotation. Since the rotation of 120 degrees at 28 is transmitted to one guide shaft 20 via the one-way clutch 29, the conveyor belt 22 in the seedling supply mechanism 13 is set to the pitch P of the seedling accommodating portion 23 in the direction of arrow B. Intermittent feed at intervals.

  When the tension is released along with the rotation of the drive shaft 19, the flexible linear body 35 moves the rotating body 28 by 120 degrees in the direction opposite to the intermittent feed direction B by the tension spring 37. It is pulled back so as to rotate back, and by repeating this, the conveying belt 22 in the seedling conveying mechanism 13 is intermittently fed in the direction of the arrow B at an interval of the pitch P of the seedling accommodating portion 23. .

  In addition, since the one-way clutch 29 having the above-described configuration exists between the rotating body 28 and one of the guide shafts 20, the conveying belt 22 can be connected regardless of the rotation of the driving shaft 19. Manual feed can be freely performed manually in a predetermined intermittent feed direction.

  In the above-described embodiment, the lever 39 has a length L1 from the center of rotation (the center of the pin 38) to one end 39a, that is, the connecting point to the other end of the flexible linear body 35. The crank radius R from the rotation center of the drive shaft 19 to the crank pin 42 is made considerably longer than the length L2 from the center of the pin 38 to the other end 39b, that is, the connecting point to the rod 43. However, by appropriately changing the ratio of L1 and L2, the crank radius R can be arbitrarily set so as to be increased or decreased. The contact pressure of the flexible linear body 35 with respect to the rotating body 28 is substantially reduced with respect to the deformation of the flexible linear body 35 and the tension spring 37 by the spring force adjusting means 40. It can be adjusted to hold a constant.

  In the above embodiment, the rotating body 28 is fed and rotated by 120 degrees. However, the present invention is not limited to this, and the rotating body 28 is fed and rotated by 360 degrees, 180 degrees, or 90 degrees. In addition to the configuration described above, instead of feeding and rotating the rotating body 28 when the flexible linear body 35 is pulled against the tension spring 37 as in the above-described embodiment, When the flexible linear body 35 is pulled back by the tension spring 37, the rotating body 28 can be fed and rotated.

It is a whole side view showing a seedling transplanter of an embodiment by the present invention. It is a top view of FIG. FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 1. FIG. 4 is a plan view of FIG. 3. It is a principal part enlarged view of FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. FIG. 7 is an enlarged sectional view taken along the line VII-VII in FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seedling transplanter 2 Front wheel 3 Rear wheel 4 Traveling machine body 5 Engine 7 Mission case 13 Seedling transport mechanism 14 Seedling planting mechanism 19 Drive shaft 20, 21 Guide shaft 22 Transport belt (endless transport body)
28 Rotating body 29 One-way clutch 35 Flexible linear body 37 Tension spring 39 Lever 40 Spring force adjusting means 41 Crank disk 42 Crank pin

Claims (5)

A seedling transport mechanism for transporting seedlings placed on the upper surface of the endless transport body at a predetermined interval to the traveling machine one by one by intermittent feeding in the endless transport body, and a descending movement of the seedling transported by the seedling transport mechanism In a seedling transplanting machine, which is equipped with a seedling planting mechanism so that it can be planted in a farm,
Between the at least one guide shaft around which the endless transport body is wound in the seedling transport mechanism and the rotary body that is rotatably fitted thereto, only the rotation of the rotary body in one direction is used as the guide shaft. While providing a one-way clutch for transmission, a flexible linear body having one end connected to an elastic means is wound around the rotating body, and the other end of the flexible linear body is connected to a power source. A seedling transplanter characterized in that it is connected to a crank pin eccentrically provided on a rotating drive shaft so as to release the tension after pulling against the elastic means during one rotation of the drive shaft.   The seedling transplanter according to claim 1, wherein the rotating body is provided with means for preventing the rotating body from rotating in the direction opposite to the feeding direction of the endless transport body.   3. The lever according to claim 1 or 2, wherein a lever pivotally mounted is provided, and the other end of the flexible linear body and the crank pin of the drive shaft are connected to the lever. A seedling transplanter characterized by.   The seedling transplanter according to any one of claims 1 to 3, wherein the elastic means is a tension spring in which a wire is wound in a coil shape.   The seedling transplanting machine according to any one of claims 1 to 4, wherein the flexible linear body is provided with a spring force adjusting means.

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