JP2006115790A - Transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transplanter made as adjustable so as not to stop its transplanting cup at a position close to the surface of a ground on cutting its crutch off. <P>SOLUTION: This transplanter is provided by fitting a crutch-acting body 45 with a transmission shaft 46 connected with the transplanting cup 22 from its outside so as to become freely slidable and also co-rotatable, also energizing the crutch-acting body 45 in its engaging direction with a crutch gear 44 moving jointly with an engine 14 by a spring 72, also installing an inclined level difference becoming a leading part 45a at the outer circumferential surface of the crutch-acting body 45 in circumferential direction and a crutch claw 67 engaging/disengaging with the leading part 45a from its diameter direction, actuating the crutch claw 67 jointly with a crutch lever 65 in the diameter direction and installing an adjusting means capable of changing the rotational phase angle of the transmission shaft 46 on releasing the crutch by adjusting the axial line directional position of the crutch claw 67. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transplanter, and more particularly, to improve a clutch structure in a transplanter that transmits power from a power source to a planting means via a clutch.

A conventional transplanting machine has a planting cup that moves up and down by power from an engine, receives seedlings when the planting cup is positioned above, and stabs the planting cups into the field when the planting cup is lowered. Some have a structure.
For example, in the transplanter disclosed in Japanese Patent Application Laid-Open No. 8-214638, as shown in FIG. 13, the crankshaft 2 is connected to the engine via an electromagnetic clutch 3, and the planting cup 1 is moved by the rotation of the crankshaft 2. It is the structure which repeats raising / lowering.
When the planting cup 1 is located at the bottom dead center during the lifting operation, the planting cup 1 is planted, while when it is located at the top dead center, the electromagnetic clutch 3 is temporarily disconnected and the planting cup 1 is installed by the braking device 4. Is stopped and seedlings are received.

As shown in FIG. 14, the braking device 4 includes a brake arm 5 fixed to the crankshaft 2 and protruding from a rubber braking roll 7, and a brake cam 6 having a stepped cam portion 6a. Each time the planting cup 1 moves up and down and is positioned at the top dead center, the braking roll 7 is engaged with the cam portion 6a of the brake cam 6 to temporarily stop the planting cup 1 at the top dead center. .
In the transplanter, when the electromagnetic clutch 3 is turned off, power transmission to the crankshaft 2 is cut off, and the crankshaft 2 that rotates by inertial force is caused by the braking roll 7 of the brake arm 5 engaging the cam portion 6a. The planting cup 1 stops at the top dead center.

However, the braking force by the braking device 4 is set to such an extent that when the crankshaft 2 is rotationally driven, the brake arm 5 pushes the brake cam 6 open and the raising and lowering of the planting cup 1 can be started. Even if it is turned off, the braking roll 7 may get over the cam portion 6a due to inertial force, and the planting cup 1 may stop at a lower position close to the ground. When the planting cup 1 stops in this way, when the transplanter is moved from the field, the planting cup 1 is likely to be caught by a step or the like protruding from the ground, and a failure may occur.
JP-A-8-214638

  This invention is made | formed in view of the said problem, and makes it a subject to provide the structure which can be adjusted easily so that a planting means may not stop in the downward position near a ground, when a clutch is cut | disconnected.

In order to solve the above problems, the present invention provides a transplanting machine including a planting means for planting seedlings in a field by moving up and down with power transmitted through a clutch from a power source,
The clutch is externally fitted to a transmission shaft connected to the planting means so as to be slidable and co-rotating in the axial direction, and the clutch operating body is coupled to the power source. And a clutch pawl that is urged by a spring in the engaging direction, and has an inclined step as a lead portion on the outer peripheral surface of the clutch operating body in the circumferential direction, and is engaged / separated from the lead portion in the radial direction. Adjusting means for operating the radial direction of the clutch pawl connected to the clutch lever and adjusting the axial position of the clutch pawl to change the rotational phase angle of the transmission shaft when the clutch is released There is provided a transplanter characterized in that it is provided.

  With this configuration, when the clutch pawl is engaged with the stepped end surface of the lead portion of the clutch operating body and the clutch operating body rotates while the lead portion is placed along the clutch pawl, the lead portion is inclined. Is disengaged by sliding on the transmission shaft in a direction away from the clutch gear, and the rotational power of the clutch gear is blocked from being transmitted to the clutch operating body. At this time, if the position of the clutch pawl is adjusted and moved with respect to the axial direction of the transmission shaft, the positional relationship between the clutch pawl and the lead portion of the clutch operating body is changed in the axial direction. Then, the circumferential position of the clutch pawl on the lead portion changes when the clutch operating body is disengaged from the clutch gear.

Therefore, only by adjusting the position of the clutch pawl, the phase angle in the rotational direction of the clutch operating body when the clutch is released can be adjusted, and the rotational phase angle when the transmission shaft fixed to the clutch operating body is stopped is adjusted. can do. As a result, it is possible to easily adjust the vertical position where the planting means connected to the transmission shaft and moved up and down stops when the clutch is released.
The fixing member may be a case for housing the clutch, a member fixed to the case, or the like.

Specifically, the clutch pawl is fixed to a shaft member whose axial direction is the same as that of the transmission shaft, and the shaft member is connected to a clutch lever, and the shaft lever is swung to swing the clutch member. The clutch pawl can be tilted in the radial direction via
The adjusting means includes a threaded cylindrical body that is rotatably fitted and fixed to the shaft member and has a screw engraved on an outer peripheral surface thereof, and a screw that is formed on the inner peripheral surface of the fixing member. Through which the threaded cylindrical body is internally fitted and screwed into the through hole of the fixing member, and the axial position of the clutch pawl can be adjusted by winding the threaded cylindrical body. It is preferable that

  With the above configuration, the shaft member moves in the axial direction integrally with the threaded cylindrical body by simply turning the threaded cylindrical body screwed into the through hole of the fixing member, and the position of the clutch pawl is easily achieved. Can be adjusted. At this time, since the shaft member to which the clutch pawl is fixed is rotatably fixed to the threaded cylinder, the shaft member does not rotate even if the threaded cylinder is wound, and the clutch pawl is engaged. Will not be adversely affected.

  It is preferable that the threaded cylindrical body has a portion extending from the through hole as a winding adjustment portion, and the winding adjustment portion is exposed to the outside of the case.

With this configuration, when adjusting the vertical stop position of the planting means when the clutch is disengaged, the user only has to turn the winding adjustment part from the outside without opening the case and dismantling, which is very maintenance. Property is improved.
The threaded cylindrical body may have a circular cross-section on the outer peripheral surface that fits into the through hole, while the winding adjustment portion exposed to the outside of the case may have a polygonal cross-section. That is, when the winding adjusting portion has a polygonal cross section, it can be easily rotated by a tool, and workability is improved.

As is clear from the above description, according to the present invention, it is possible to adjust the rotational phase angle at which the transmission shaft stops at the time of disengagement only by adjusting the position of the clutch pawl, and as a result, it is linked to the transmission shaft. It is possible to adjust the vertical stop position when the clutch of the planting means that moves up and down is disengaged.
In addition, the position adjustment of the clutch pawl can be easily performed by simply turning the winding adjustment portion of the threaded cylindrical body that externally fits the shaft member fixed to the clutch pawl from the outside of the case. improves.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a transplanter 10 according to an embodiment, in which a front wheel 12 and a rear wheel 13 provided on a body 11, an engine 14 as a power source, a deceleration mission 15, and a transmission mission 16 incorporating a clutch 100 described later. A transmission box 17 for relaying power transmission to the rear of the machine body, a planting cup 22 (planting means) for planting seedlings in the field, and a rotary box 20 for alternately raising and lowering the pair of planting cups 22 (22A, 22B). And the raising / lowering coupling body 21 which converts the rotation output from the rotary box 20 into the raising / lowering operation | movement of the planting cup 22 is provided.

  Behind the machine body 11 is a seedling platform 23 for feeding the pot seedling box N, a steering handle 28, and a seedling extruded from the pot seedling box N by an extruding device (not shown). A seedling transporting belt 26 and a seedling pinching roller 25 that changes the seedling falling from the end of the seedling transporting belt 26 from a horizontal posture to a vertical posture and guides the seedling to the planting cup 22. In addition, a cover ring 27 is provided behind the planting cup 22.

Next, a power transmission path from the engine 14 to the planting cup 22 will be described with reference to FIG.
Rotational power from the engine 14 is supplied to the centrifugal clutch 30 → first shaft 31 → bevel gear 32 → second shaft 33 → third shaft 34 → first gear 35 → second gear 36 → fourth shaft 37 in the deceleration mission 15. → Third gear 38 → safety clutch 39 → bevel gear 40 → PTO shaft 41 Power is transmitted while changing the rotational speed. Rotational power introduced into the transmission mission 16 from the deceleration mission 15 via the PTO shaft 41 is transmitted to the stock changeover gear 43 by the chain 42 wound around the sprocket and transmitted to the clutch gear 44 constituting the clutch 100. .

When the clutch 100 is connected, power is transmitted to the transmission shaft 46 via the clutch operating body 45 engaged with the clutch gear 44, and the force is divided by the bevel gear 47 to the planting cup front drive shaft 48. Then, power is transmitted to the rear drive shaft 52 for the planting cup via the sprocket 51 by the chain 50 wound around the sprocket 49 at the end of the front drive shaft 48 for the planting cup, and the rotational power is supplied to the rotary box 20. Is introduced.
In the rotary box 20, left and right lifting and lowering connecting bodies 21 are attached so that a pair of planting cups 22A and 22B are alternately raised and lowered. The connecting body 21 for raising and lowering connects the output shaft 56 from the rotary box 20 with the first case 57 → the connecting shaft 74 → the second case 58 → the connecting shaft 75 → the third case 59, and the planting cups 22A and 22B. Keeping the posture constant.

Next, the detailed structure of the clutch 100 will be described.
As shown in FIGS. 3A to 3C and FIGS. 4A and 4B, the clutch 100 provided in the case 64 (fixed member) of the transmission mission 16 receives the rotational power from the engine 14. The clutch gear 44 is loosely fitted to the transmission shaft 46 so as to be freely rotatable, and a clutch operating body 45 engaged / separated from the clutch gear 44 is slidably fitted to the transmission shaft 46 so as to be slidable in the axial direction. . The clutch operating body 45 is fixed in the rotational direction with respect to the transmission shaft 46, and the transmission shaft 46 rotates when the clutch operating body 45 rotates.

On the back side of the clutch operating body 45, the spring receiving gear 71 is fixed to the transmission shaft 46 via the spring 72, and the clutch operating body 45 is pressed against the clutch gear 44 side by the urging force of the spring 72. The transmission shaft 46 transmits power to the planting cup front drive shaft 48 in the orthogonal direction via a bevel gear 47.
The clutch pawl 67 that engages / separates from the outer peripheral surface of the clutch operating body 45 is provided with a tip portion 67a that protrudes toward the clutch operating body 45, and is fixed to a shaft member 70 whose axial direction coincides with the transmission shaft 46. Further, the shaft member 70 is fixed to a clutch lever 65 linked to a clutch operation unit (not shown). That is, the shaft member 70 is rotated when the user operates the clutch operating portion on / off to swing the clutch lever 65, and the clutch pawl 67 is engaged with or separated from the clutch operating body 45.

A threaded cylindrical body 69 is rotatably fitted on the shaft member 70 as an adjusting means. The threaded cylinder 69 has a screw on the outer peripheral surface, while the inner peripheral surface is a smooth surface. A boss-like through hole 64a is formed in the case 64 of the transmission mission 16, and a screw is engraved on the inner peripheral surface of the through hole 64a. The threaded cylindrical body 69 is fitted in and screwed into the through hole 64a of the case 64, and a winding adjusting portion 69a having a square cross section is formed at a portion extending from the through hole 64a of the threaded cylindrical body 69. 64 is exposed to the outside. Further, the winding adjusting portion 69a is fitted with a saw-tooth hole 68a of the clutch adjusting plate 68, and the mounting hole 68b of the clutch adjusting plate 68 is fixed to the case 64 with a bolt.
In the state where the clutch adjustment plate 68 is bolted to the case 64 by the mounting hole 68b, the sawtooth hole 68a locks the winding adjusting portion 69a to prevent the threaded cylindrical body 69 from rotating unexpectedly. is doing.

  As shown in FIGS. 5 (A) to 5 (D), the clutch operating body 45 has a substantially cylindrical shape having a through hole 45c, and the outer peripheral surface is spirally inclined with a step serving as a lead portion 45a with respect to the circumferential direction. A pair of engaging portions 45 b protrude from the surface facing the clutch gear 44. As shown in FIGS. 5B and 5D, the lead 45a smoothly changes the height of the step from the A position to the E position in the circumferential direction. Further, as shown in FIG. 5B, the inner peripheral surface of the through-hole 45c is provided with irregularities extending in the axial direction, and the outer peripheral surface of the transmission shaft 46 that is fitted externally extends in the axial direction as well. The existing unevenness is provided. By engaging these concaves and convexes with each other, the clutch operating body 45 is slidable with respect to the transmission shaft 46 and is connected and fixed in the rotational direction.

The clutch gear 44 is provided with a tooth portion 45 b on the outer peripheral surface and an engaged portion 44 a on the surface facing the clutch operating body 45.
Further, as shown in FIGS. 4 (A) and 6, the positional relationship between the tip 67a of the clutch pawl 67 and the lead 45a of the clutch operating body 45 is an intermediate position between the D position and the E position (phase angle of about 280 °), it is in a state separated by a distance L1 (for example, L1 = 0.5 mm) in the axial direction.

Next, the operation of the clutch 100 will be described.
First, as shown in FIGS. 4A and 4B, when the clutch pawl 67 is separated from the clutch operating body 45, the engaging portion 45b of the clutch operating body 45 is covered by the clutch gear 44 by the urging force of the spring 72. Rotating power from the engine 14 is transmitted in the order of clutch gear 44 → clutch operating body 45 → transmission shaft 46 → bevel gear 47 → planting cup drive shaft 48.

  In order to cut off the power transmission of the clutch 100, as shown in FIGS. 7A and 7B, the clutch lever 67 is swung to rotate the clutch pawl 67 via the shaft member 70, and the clutch pawl 67. Is engaged with the step end surface of the lead portion 45a of the clutch operating body 45. Then, as shown in FIGS. 8A and 8B, the clutch operating body 45 rotating integrally with the transmission shaft 46 turns spirally while being guided by the clutch pawl 67 and is separated from the clutch gear 44. The engagement between the engaging portion 45b and the engaged portion 44a is released, and the power transmission is interrupted.

That is, as shown in FIG. 11A, the lead portion 45a of the clutch operating body 45 is guided while rotating by the tip end portion 67a of the clutch pawl 67 fixed in the axial direction. The rotation phase angle in the circumferential direction stops at a position rotated from about 280 ° to about 90 °, and is separated from the clutch gear 44.
When the rotation phase angle of the clutch operating body 45, that is, the rotation phase angle of the transmission shaft 46 is stopped at around 90 °, the planting cups 22A and 22B linked to the transmission shaft 46 are at the positions shown in FIG. Stop.

Next, adjustment of the stop position of the planting cups 22A and 22B when the clutch is disconnected will be described.
12A, the height H1 of the one-side planting cup 22A from the ground G is low, and the level at which the planting cup 22A protrudes from the ground G when the transplanter 10 is moved from the field. There is a risk of getting caught. Therefore, the stop position of the planting cups 22A and 22B is adjusted by adjusting the axial position of the clutch pawl 67.

Specifically, as shown in FIGS. 3 (A) to 3 (C) and FIGS. 9 (A) and 9 (B), the user removes the fixing of the mounting hole 68b of the clutch adjustment plate 68 and replaces the sawtooth hole 68a with a threaded cylinder. When the clutch adjusting plate 68 is turned by hand in a state of being fitted and locked to the winding adjusting portion 69 a of 69, the screw on the outer peripheral surface of the threaded cylindrical body 69 becomes the screw on the inner peripheral surface of the through hole 64 a of the case 64. The threaded cylinder 69 is moved integrally with the shaft member 70 and the clutch pawl 67 in the axial direction.
Then, as shown in FIG. 9B, the positional relationship between the tip portion 67a of the clutch pawl 67 and the lead portion 45a of the clutch operating body 45 is an intermediate position between the D position and the E position (the phase angle is about 280 °). ), The distance L2 (for example, L2 = 2.0 mm) is further separated in the axial direction. (L1 <L2)

  10A and 10B, when the tip end portion 67a of the clutch pawl 67 is reengaged with the step end surface of the lead portion 45a of the clutch operating body 45 in order to cut off the power transmission of the clutch 100 in this setting state. As shown, the clutch operating body 45 is separated from the clutch gear 44 while being guided by the clutch pawl 67, the engagement portion 45b and the engaged portion 44a are disengaged, and the power transmission is interrupted.

At this time, since the position of the clutch pawl 67 in the axial direction has been changed, as shown in FIG. 11 (B), the clutch operating body 45 has a circumferential rotational phase angle that is increased from about 280 ° to about 20 °. It stops at the rotated position and is separated from the clutch gear 44.
In this way, the rotation phase angle of the clutch operating body 45 when the clutch is disengaged, that is, the rotation phase angle of the transmission shaft 46 is changed, so that the planting cups 22A and 22B linked to the rotation of the transmission shaft 46 are stopped. The position is changed to the position shown in FIG. 12B, and the height H2 from the ground G can be increased. (H1 <H2)

  As described above, when the user determines that the stop positions of the planting cups 22A and 22B are close to the ground G, the user uses the clutch adjustment plate 68 from the outside without opening the case 64 of the transmission mission 16. Thus, it is possible to adjust the stop positions of the planting cups 22A and 22B simply by screwing the winding adjustment portion 69a of the threaded cylindrical body 69. Therefore, it is possible to prevent the planting cups 22A and 22B from interfering with the ground G and the like, and to improve the maintainability.

It is a schematic side view of the transplanter of the embodiment of the present invention. It is a systematic diagram which shows the power transmission path | route of a transplanter. (A) is a front view of a transmission mission, (B) is a front view of a threaded cylinder, and (C) is a front view of a clutch adjustment plate. (A) is a front view of the clutch operating body and the clutch pawl in a separated state, and (B) is a partial cross-sectional plan view of the clutch as viewed from the A view of FIG. (A) is a perspective view of a clutch operating body, (B) is a top view, (C) is a side view, and (D) is a drawing showing a state in which a lead portion is developed in a plane. It is a partial cross section top view before adjusting a position of a clutch pawl. (A) is a front view of the engagement state of a clutch action body and a clutch pawl, (B) is a partial cross section top view of a clutch. (A) is a front view of the engagement state of a clutch operation body and a clutch nail | claw, (B) is a partial cross section top view after a clutch cutting | disconnection. (A) is a front view of the clutch operating body and the clutch pawl in a separated state, and (B) is a partial cross-sectional plan view after adjusting the position of the clutch pawl. (A) is a front view of the engagement state of a clutch operation body and a clutch nail | claw, (B) is a partial cross section top view after a clutch cutting | disconnection. (A) is a drawing in which the lead portion showing the position before adjusting the position of the clutch pawl is developed on a plane, and (B) is a drawing in which the lead portion showing the position after adjusting the position of the clutch pawl is developed in a plane. (A) is a rear view which shows the stop state of the planting cup before the position adjustment of a clutch nail | claw, (B) is a rear view which shows the stop state of the planting cup after the position adjustment of a clutch nail | claw. It is drawing which shows a prior art example. It is drawing which shows the principal part of a prior art example.

Explanation of symbols

10 transplanter 11 fuselage 12 front wheel 13 rear wheel 14 engine (power source)
15 Deceleration mission 16 Transmission mission 17 Transmission box 20 Rotary box 21 Elevating connector 22 Planting cup (planting means)
23 Seedling stand 25 Seedling clamping roller 26 Seedling transport belt 27 Covering ring 28 Handle 44 Clutch gear 45 Clutch operating body 45a Lead part 45b Engaging part 46 Transmission shaft 47 Bevel gear 48 Drive shaft 64 for planting cup Case (fixing member)
64a Through hole 65 Clutch lever 67 Clutch claw 68 Clutch adjustment plate 69 Threaded cylinder 70 Shaft member 71 Spring bearing gear 72 Spring 100 Clutch

Claims (3)

In a transplanter equipped with a planting means for planting seedlings in a farm by moving up and down with power transmitted from a power source via a clutch,
The clutch is externally fitted to a transmission shaft connected to the planting means so as to be slidable and co-rotating in the axial direction, and the clutch operating body is coupled to the power source. And a clutch pawl that is urged by a spring in the engaging direction, and has an inclined step as a lead portion on the outer peripheral surface of the clutch operating body in the circumferential direction, and is engaged / separated from the lead portion in the radial direction. And adjusting means for changing the rotational phase angle of the transmission shaft when the clutch is released by adjusting the axial position of the clutch pawl in the radial direction. A transplanting machine characterized by comprising: The clutch pawl is fixed to a shaft member whose axial direction is the same as that of the transmission shaft, and the shaft member is connected to a clutch lever, and the clutch lever is pivoted to swing the clutch through the shaft member. The nail can be tilted in the radial direction,
The adjusting means includes a threaded cylindrical body that is rotatably fitted and fixed to the shaft member and has a screw engraved on an outer peripheral surface thereof, and a screw that is formed on the inner peripheral surface of the fixing member. Through which the threaded cylindrical body is internally fitted and screwed into the through hole of the fixing member, and the axial position of the clutch pawl can be adjusted by winding the threaded cylindrical body. The transplanter according to claim 1.   3. The transplanter according to claim 1, wherein the threaded cylindrical body has a portion extending from the through hole as a winding adjustment portion, and the winding adjustment portion is exposed to the outside of the case.

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