JP3602045B2 - Ridge clutch structure of rice transplanter - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a ridge-side clutch structure of a rice transplanter, which is configured so that a plurality of ridge-side clutch levers can be used to switch a corresponding ridge-side clutch to perform planting of a few rows.
[0002]
[Prior art]
Conventionally, in a ridge-side clutch structure of a rice transplanter as described above, a ridge for planting provided for each branch transmission system that branches and transmits power from a feed case to a planting mechanism supported by each planting transmission case. As disclosed in, for example, Japanese Utility Model Publication No. 3-5217, a sprocket, which is a transmission system on the side of the planting mechanism, and a transmission position meshing with a meshing claw provided on the sprocket and a meshing claw thereof are used. A pin-shaped operating member movable to a separated non-transmission position and rotatable about an axis orthogonal to the moving direction of the shift member between the shift member and the shift member urged to return to the transmission position. There has been a configuration in which a few cams can be planted by interposing a flat cam portion formed as described above and moving the shift member to a non-transmission position by rotating the operation member.
[0003]
On the other hand, of the vertical feed belts of the vertical feed mechanism provided on each seedling mounting surface of the seedling mounting table, the first vertical feed belt provided on the first row of seedling mounting surfaces from the left and right sides and the second feed belt An input portion of a vertical feed mechanism is disposed between the second vertical feed belt disposed on the seedling mounting surface and a ridge for vertical feed provided in a seedling planting apparatus configured for five-row planting. As the clutch, a first ridge-side clutch for longitudinal feed interposed between a longitudinal feed shaft and a first longitudinal feed belt extending right and left from an input portion thereof, a longitudinal feed shaft and a second longitudinal feed By linking the second ridge clutch for vertical feeding interposed between the belt and the same ridge clutch lever via a special linking wire, the operation of this single ridge clutch lever can be performed. In some cases, the switching operation between the first ridge-side clutch and the second ridge-side clutch can be performed simultaneously.
[0004]
[Problems to be solved by the invention]
In order to plant a fraction of a row, the planting clutch must first be turned off, and then the desired ridge-side clutch must be turned off.However, in some cases, the ridge-side clutch may not be able to be disconnected well. There is room for improvement in the operability of the ridge-side clutch disconnection when the planting clutch is disengaged, such as the need to repeat the disengagement operation.
[0005]
In the former of the above prior arts, since the cam portion of the operating member for operating the shift member has a flat shape, the cam portion can withstand a long-term use while securing the operation amount of the shift member. In order to provide sufficient strength, it is necessary to increase the thickness of the cam portion while employing a large-diameter operation member. Therefore, in order to improve the durability of the planting ridge clutch, the planting ridge clutch becomes large and disadvantageously increases the manufacturing cost.
[0006]
In addition, since the cam portion of the operating member for operating the shift member is interposed between the sprocket on the side of the planting mechanism and the shift member to which the transmission member is connected, the cam member in the state where the shift member is located at the transmission position. In order to make the relative rotation of the sprocket and the shift member favorable, it is necessary to increase the processing accuracy and the assembling accuracy of the sprocket, the shift member, and the operating member, and the operation is performed along with the rotation of the shift member on the driving side. In order to avoid inconvenience such as the member rotating and the shift member unexpectedly moving to the non-transmission position, a flat cam portion is provided at a position eccentric from the rotation axis of the operation member. Since it is necessary to perform a relatively complicated process such as forming, a considerable labor is required for the production and a problem that the production cost is further increased has been caused.
[0007]
In addition, in the conventional ridge-side clutch, when the ridge-side clutch lever is operated in the clutch disengaged state, the clutch should be engaged by the return spring, but in some cases, the clutch cam and the shift member were caught. Such a phenomenon sometimes occurred and the clutch could not be engaged properly.
[0008]
A first object of the present invention is to ensure that the ridge-side clutch can be surely disengaged when the planting clutch is disengaged, or to enable the clutch-engaged state to appear smoothly without being caught when the ridge-side clutch is engaged. Is to do. A second object of the present invention is to provide a planting ridgeline clutch for planting which can be manufactured easily and reduce the manufacturing cost, and which can withstand long-term use and has excellent durability .
[0009]
[Means for Solving the Problems]
〔Constitution〕
The configuration of claim 1, in furrow when clutch structure of rice transplanter that is configured to allow the planting of several Article end in switching operation of the corresponding ridge when the clutch by the clutch lever when a plurality of ridges, ridge when clutch rice transplanter In the structure, the relative positions of the stop position angle ranges are set so that the stop position angle range for disengaging the ridge-side clutch starts before the stop position angle range for disengaging the planting clutch. It is characterized in that an angular position is set .
[0010]
[Action]
The details will be described in the embodiment section, but the following operation can be obtained. That is, in order to plant a few rows, in the state where the planting clutch is turned off and the seedling planting device is stopped, the clutch at the predetermined ridge side is turned off. At that time, the cutting operation should be possible. The conventional disadvantage that the ridge-side clutch cannot be turned off is eliminated, and the ridge-side clutch can be reliably engaged.
[0011]
〔effect〕
Therefore, the cutoff operation of the ridge-side clutch at the time of disengagement of the planting clutch is ensured by a simple and economical modification that sets the stop position angle range of both the planting clutch and the ridge-side clutch slightly shifted, without increasing the cost. It is now possible to show the fractional planting condition.
[0012]
〔Constitution〕
According to a second aspect of the present invention, in the ridge clutch structure of the rice transplanter according to the first aspect, a plurality of ridges can be planted by switching a corresponding ridge clutch by a plurality of ridge clutch levers. In the ridge-side clutch structure of a rice transplanter, the ridge-side clutch for planting provided in each branch transmission system that branches and transmits the power from the feed case to the planting mechanism supported by each planting transmission case is connected to the feed case side. A shift member movable between a transmission position connected to the transmission system of the first embodiment and a non-transmission position separated from the transmission system on the feed case side, and urged to return to the transmission position; and a moving direction of the shift member. A first flange having a notch formed at a predetermined position on an outer periphery of the shift member; A second flange is provided at a predetermined interval on the non-transmission position side from the first flange, and the first flange and the second flange are provided on the operation member in such a state that the rotation about the axis of the operation member is permitted only when the operation member is adjacent to the notch. A semicircular cam portion that engages with the two flanges and presses the shift member to the non-transmission position with rotation of the operation member around the axis;
Of the pair of end faces facing the notch in the first flange, the second flange side corner of the lower end, which is the lower side in the rotation direction of the shift member, is inclined such that the notch widens toward the second flange. It is characterized in that it is formed on the flank.
[0013]
[Action]
According to the second aspect of the present invention, when the operating member is rotated so that the smooth surface of the cam portion faces the second flange, the shift member moves the second flange close to the smooth surface of the cam portion. As a result, it returns to the transmission position connected to the transmission system on the feed case side. When the first flange is adjacent to the cam portion at this transmission position, the change in the posture of the cam portion is prevented by the first flange and the second flange arranged side by side at a predetermined interval on the outer periphery of the shift member. Thus, the rotation operation of the operation member can be reliably disabled, so that the shift member can be stably held at the transmission position. Further, when the notch portion is adjacent to the cam portion at the transmission position, the cam portion can be engaged with the notch portion so that the turning operation of the operating member becomes possible, and the turning operation of the operating member becomes impossible. When this is performed, the cam portion changes its posture to a posture in which the shift member is pressed to the non-transmission position at the other end while engaging one end of the shift member with the notch portion. The operation can be reliably performed up to the position, and the planting mechanism can be stopped at a predetermined posture corresponding to the formation position of the notch.
[0014]
Since the cam portion of the operation member for operating the shift member is formed in a semicircular shape, a large-diameter operation member is employed as in the above-described related art (the cam portion is formed in a flat shape). Even without this, it is possible to easily provide high strength enough to withstand long-term use while securing the operation amount of the shift member. In other words, it is possible to improve the durability of the ridge-side clutch for planting without increasing the size of the ridge-side clutch for planting and increasing the manufacturing cost due to the adoption of a large-diameter operating member. Become.
[0015]
In addition, since the cam portion has a semicircular shape, the first flange contacts the curved surface of the cam portion even when the operation member attempts to rotate with the rotation of the shift member when the cam portion is adjacent to the notch portion. As a result, since the rotation of the operation member is prevented, it is not necessary to perform a troublesome process such as forming a cam portion at a position eccentric from the rotation axis of the operation member as in the above-described related art. In addition, it is possible to prevent the shift member from being unexpectedly moved to the non-transmission position due to the rotation of the operation member with the rotation of the shift member. The cost can be reduced.
[0016]
Further, since the cam portion for operating the shift member is engaged between the first flange and the second flange which are arranged side by side at a predetermined interval on the outer periphery of the shift member, the side of the planting mechanism to which the transmission mechanism is connected is connected. Compared with the prior art in which the cam portion of the operating member for operating the shift member is interposed between the sprocket and the shift member, the number of parts requiring high machining accuracy and assembly accuracy can be reduced, and accordingly, Therefore, it is possible to reduce labor and manufacturing cost required for manufacturing.
[0017]
Further, as will be described in detail in the embodiment section, of the pair of end surfaces facing the cutout portion in the first flange, the second flange side corner portion of the lower side end which is the lower side in the rotation direction of the shift member, The notch is formed on the inclined flank that widens toward the second flange, so that the operating member at the clutch disengagement position can be smoothly operated to the clutch disengagement position without being caught, and the ridge-side clutch can be turned on and off. This will ensure that the ridge-side clutch can be engaged.
[0018]
〔effect〕
Accordingly, it is possible to provide a ridge-side clutch for planting that can facilitate manufacture and reduce manufacturing cost, has excellent durability that can withstand long-term use, and can reliably and smoothly exhibit a re-clutched state. Became.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows the entire side surface of a rice transplanter. This rice transplanter raises and lowers a seedling planting device 3 at a rear portion of a traveling machine body 1 via a link mechanism 2 which moves up and down by operation of a hydraulic cylinder 2A. It is constituted by freely connecting.
[0020]
The traveling body 1 includes an engine 4 mounted on a front portion thereof, a transmission 5 to which power from the engine 4 is transmitted, a pair of left and right front wheels 6 and a rear wheel 7 to which power after shifting from the transmission 5 is transmitted. , A steering wheel 8 linked to the front wheel 6, and a driver's seat 9 disposed behind the steering wheel 8, are configured as a riding type.
[0021]
As shown in FIGS. 1 to 5, the seedling planting device 3 includes a square pipe-shaped support frame 10 arranged in the left-right direction, a feed case 11 connected to the center of the support frame 10, and a predetermined space in the left-right direction. Three planting transmission cases 12 extending rearward from the support frame 10 in a state in which the planting transmission case 12 is located at the center of the planting transmission case 12 at equal intervals in the left-right direction and located at the rear right and left and right. A total of five rotary-type planting mechanisms 14 supported on each planting transmission case 12 via a rotating shaft 13 so as to be located on the left and right sides of the rear of the planting transmission case 12. The seedling mounting table 15 formed so as to mount the seedlings, the lateral feed mechanism 16 for reciprocating the seedling mounting table 15 in a constant stroke in the left-right direction with respect to each planting mechanism 14, and the seedling mounting table 15 at the stroke end. Matte seedlings Longitudinal feeding mechanism 17 for feeding, and are configured to allow the planting of Article 5 min the like ground leveling float 18, the 3 groups performing leveling action previously with respect to seedling planting places due to the planting mechanism 14.
[0022]
The feed case 11 transfers the power transmitted from the traveling machine body 1 via the transmission shaft 19 to the horizontal feed drive shaft 16a of the horizontal feed mechanism 16, the vertical feed drive shaft 17a of the vertical feed mechanism 17, and each planted transmission case. The transmission is transmitted to an input shaft 26 of a branch transmission system 24 installed in each planting transmission case 12 so as to branch and transmit to the planting mechanism 14 supported by the plant 12.
[0023]
As shown in FIG. 6, each branch transmission system 24 includes a torque limiter 27 mounted on each input shaft 26, a planting ridge clutch 28 mounted on each rotating shaft 13, and a ridge from the torque limiter 27. It is constituted by a chain-type speed reduction mechanism 29 that transmits a speed reduction to the clutch 28, and the like.
[0024]
As shown in FIGS. 4 and 9, the torque limiter 27 has a shift member 27 </ b> A spline-fitted to each input shaft 26 so as to be relatively slidable, and loosely fits to each input shaft 26 in a state where the input shaft 26 is not slidable. And a spring 27C that presses and biases the shift member 27A toward the rotary member 27B. The three meshes formed on the left side surface of the shift member 27A by the pressing of the spring 27C. The pawl 27a is transmitted to the planting mechanism 14 by meshing with three meshing claws 27b formed on the right side surface of the rotating body 27B. When a load of a predetermined value or more is applied to the branch transmission system 24 due to contact with another object of the planting mechanism 14 or the like, the shift members 27A are pressed against the meshing claws 27a and 27b against the bias of the spring 27C. The climbing inclined surfaces a and b are formed to release the transmission to the planting mechanism 14 by causing the engaging claw 27a on the side to ride on the engaging claw 27b on the rotating body 27B side. Even if a load equal to or greater than a predetermined value is applied, damage to the planting mechanism 14, the branch transmission system 24, and the like due to continuing transmission to the planting mechanism 14 can be avoided. The shift members 27A and the rotating body 27B are formed with three engaging claws 27a and 27b at different disposition pitches so that they can be transmitted and connected only in a predetermined rotation phase. Even when the mechanism 14 is temporarily stopped by the operation of the torque limiter 27, when the planting mechanism 14 is restarted, it can be operated in synchronization with the other planting mechanisms 14. Has become.
[0025]
As shown in FIGS. 4 to 8, the planting ridge-side clutch 28 includes a rotating body 28 </ b> A loosely fitted to the rotating shaft 13 in a non-slidable manner so as to be a transmission system on the feed case 11 side. 13, a shift member 28B spline-fitted in a state capable of sliding relative to the pin 13, a pin-shaped operation member 28C rotatable about an axis P orthogonal to the moving direction of the shift member 28B, and a shift member 28B. It is constituted by a spring 28D that urges against the rotating body 28A.
[0026]
As shown in FIGS. 4 and 5, the chain-type speed reduction mechanism 29 includes a small-diameter drive sprocket 29A welded to the rotating body 27B of the torque limiter 27 and a large-diameter welding body 28A welded to the ridge-side clutch 28 for planting. A driven sprocket 29B having a diameter and a transmission chain 29C wound around the sprockets 29A and 29B are configured to reduce the power from the feed case 11 to 1/2.
[0027]
3 to 8, the right side of the rotating body 28A and the left side of the shift member 28B are moved to the transmission position of the shift member 28B, as shown in FIGS. A pair of meshing claws 28a and 28b are formed so as to be meshed and connected with the shift member 28B and to be released with the shift of the shift member 28B to the non-transmission position. A first flange 28d having a notch 28c formed at a predetermined position 180 degrees out of phase on the outer periphery of the shift member 28B, and a first flange 28d spaced apart from the first flange 28d by a predetermined distance to the non-transmission position side. A second flange 28e having a larger protrusion amount than that is formed.
[0028]
The lower end of the operating member 28C engages between the first flange 28d and the second flange 28e in a state in which the operating member 28C is allowed to rotate around the axis P only when adjacent to the notch 28c. At the same time, a semicircular stepped cam portion 28f is formed which presses the shift member 28B to the non-transmission position against the urging of the spring 28D as the operation member 28C rotates around the axis P. ing. On the upper part of the operation member 28C, an operation linked via a linking wire 31 and a storage spring 32 to a corresponding one of the three ridge-side clutch levers 30 arranged side by side on the upper rear surface of the seedling mounting table 15. The arm 28E is welded, and a return spring 28F that biases the operation member 28C toward the operation position in which the smooth surface c of the cam portion 28f faces the second flange 28e is externally fitted.
[0029]
From the above configuration, when the corresponding ridgeline clutch lever 30 is operated from the off position to the on position, the operation member 28C causes the operation member 28C to move its cam portion 28f by the action of the return spring 28F. Is rotated to the operation position facing the second flange 28e, and the shift member 28B is moved by the action of the spring 28D so that the second flange 28e approaches the smooth surface c of the cam portion 28f. The meshing claw 28b is operated to a transmission position at which it meshes with the meshing claw 28a of the rotating body 28A, so that a transmission state for the corresponding planting mechanism 14 appears.
[0030]
When the shift member 28B rotates with the appearance of this transmission state and the first flange 28d comes adjacent to the curved surface d of the cam portion 28f, the first flange 28d is aligned with the outer periphery of the shift member 28B at a predetermined interval. Since the change in the posture of the cam portion 28f is prevented by the first flange 28d and the second flange 28e provided, the rotation operation of the operation member 28C can be reliably disabled, and thus the shift member can be provided. 28B can be stably held at the transmission position.
[0031]
When the corresponding ridge-side clutch lever 30 is operated from the engaged position to the disengaged position, the operating force is accumulated in the accumulation spring 32 until the notch portion 28c is adjacent to the curved surface d of the cam portion 28f, When the notch portion 28c is adjacent to the curved surface d of the cam portion 28f, the cam portion 28f can be engaged with the notch portion 28c and the operation member 28C can be rotated. The rotation operation of the operation member 28C by the action is started, and the cam portion 28f is in a posture of pressing the shift member 28B to the non-transmission position at the other end while engaging one end of the operation member 28C with the notch 28c. Accordingly, the shift member 28B can be reliably operated to the non-transmission position where the meshing claw 28b is separated from the meshing claw 28a of the rotating body 28A, and the corresponding planting mechanism 14 is notched. 28c Predetermined posture in accordance with the formation position, that is, so that it can be stopped in a posture in which a pair of planting claw 14A that is provided on the planting mechanism 14 is separated from the field and Naeno stand 15.
[0032]
As shown in FIGS. 2 and 3, the lateral feed mechanism 16 moves a top member (not shown) provided in a moving body 16 b connected to the seedling mounting table 15 with rotation of the lateral feed drive shaft 16 a. The seedling table 15 can be reciprocated at a constant stroke in the left-right direction by screw-feeding through an endless spiral groove 16c formed on the lateral feed drive shaft 16a.
[0033]
As shown in FIGS. 2, 3, 10 and 11, the vertical feed mechanism 17 includes first vertical feed belts 17 </ b> Aa to 5 </ b> A <b> 5 arranged in pairs on the seedling mounting surfaces 15 </ b> Aa to 15 </ b> Ae of the seedling mounting table 15. The vertical feed belt 17Ae is disposed between the first vertical feed belt 17Aa provided on the first seedling mounting surface 15Aa and the second vertical feed belt 17Ab provided on the second seedling mounting surface 15Ab from the right. Input portion 17B, a vertical feed shaft 17C consisting of a hexagonal shaft extending leftward and rightward from the input portion 17B, and a first seedling from the right side which is fitted around the vertical feed shaft 17C so as to be relatively rotatable. The first cylindrical shaft 17Da and the vertical feed shaft 17C, which interlock and connect the pair of first vertical feed belts 17Aa disposed on the mounting surface 15Aa, are externally rotatably fitted to the first cylindrical shaft 17Da and the second seedling mounting surface 15Ab from the right side. A pair of second vertical feed belts arranged in The second cylindrical shaft 17Db interlocking connecting 7ab, is relatively rotatably fitted on a vertical feed shaft 17C.
[0034]
The third cylindrical shaft 17Dc and the vertical feed shaft 17C, which interlock and connect a pair of third vertical feed belts 17Ac provided on the seedling mounting surface 15Ac at the third row (left and right center) from the right side, are relatively rotatably fitted to the outside. And a fourth cylindrical shaft 17Dd for linking the fourth vertical feed belt 17Ad and the fifth vertical feed belt 17Ae disposed on the seedling mounting surfaces 15Ad and 15Ae of the fourth and fifth rows from the right side, and the vertical feed. A first ridge-side clutch 17Ea for vertical feed interposed between the shaft 17C and the first vertical feed belt 17Aa, and a vertical feed interposed between the vertical feed shaft 17C and the second vertical feed belt 17Ab. Second ridge-side clutch 17Eb, third ridge-side clutch 17Ec for vertical feed interposed between the vertical feed shaft 17C and the third vertical feed belt 17Ac, and the vertical feed shaft 17C and the fifth vertical feed belt. Interposed between 17Ae Fourth ridges when the clutch 17Ed for longitudinal feed, is constituted by the like.
[0035]
The input portion 17B is provided with a pair of drive arms 17b arranged side by side at predetermined intervals on the vertical feed drive shaft 17a, and each time the seedling mounting table 15 reaches the left and right stroke ends, the one-way clutch 17c is connected to the vertical feed shaft 17C. The vertical feed shaft 17C is configured to intermittently rotate by performing a kick-up operation of the operation arm 17d provided through the control arm.
[0036]
From the above configuration, the vertical feeding mechanism 17 can vertically feed the mat-shaped seedlings placed on the seedling mounting surfaces 15Aa to 15Ae by a predetermined amount each time the seedling mounting table 15 reaches the left and right stroke ends. It has become.
[0037]
As shown in FIG. 3 (and FIG. 11), the first ridge-side clutch 17Ea and the second ridge-side clutch 17Eb for longitudinal feed are disposed on the right side via a linking wire 33 and a shift fork (not shown). It is linked to the clutch lever 30 on the ridge side. The third ridge-side clutch 17Ec for vertical feed is linked to a ridge-side clutch lever 30 disposed at the center on the left and right via a linking wire 35 and a shift fork (not shown). The fourth ridge-side clutch 17Ed for vertical feed is linked to a ridge-side clutch lever 30 disposed on the left side via a linking wire 35 and a shift fork (not shown).
[0038]
That is, by operating the right ridge-side clutch lever 30, the first ridge-side clutch 17Ea and the second ridge-side clutch 17Eb for vertical feed can be simultaneously switched, and the first vertical feed belt 17Aa and the second The transmission state of the vertical feed belt 17Ab can be switched, and the third vertical feed belt 17Ea for vertical feed can be switched by operating the left / right center ridge clutch lever 30. The transmission state for 17Ac can be switched, and by operating the left ridgeline clutch lever 30, the fourth ridgeline clutch 17Ed for vertical feed can be switched, and the fourth vertical feed belt 17Ad and the fifth The state of transmission to the vertical feed belt 17Ae can be switched.
[0039]
Then, as shown in FIG. 12, the linking wire 33 for linking the first ridge-side clutch 17Ea and the second ridge-side clutch 17Eb for longitudinal feed to the right-side ridge-side clutch lever 30 is connected to the ridge-side clutch lever 30. And a second linking wire 33B extending from the end of the first linking wire 33A on the side of the second rowing clutch 17Eb to the first rowing clutch 17Ea. ing.
[0040]
With the above configuration, when only the right ridge-side clutch lever 30 is operated to the cut position, the planting operation for the two right streaks can be stopped, and the fraction streak can be planted for the three left streaks. By operating the clutch lever 30 at the cutting position on each of the ridges on the right side and the center on the right and left, the planting operation of the right three rows can be stopped, and the fractional row of the left two rows can be planted. When only the clutch lever 30 on the left ridge is operated to the disengaged position, the planting operation of the two left streaks can be stopped, and the right three streaks can be planted. When the clutch lever 30 at the center of each ridge is operated to the disengaged position, the planting operation of the three left streaks can be stopped, and the planting of two right streaks can be performed.
[0041]
Next, a modification point of the ridge-side clutch 28 will be described.
As shown in FIGS. 6 to 8, of the two end faces of the first flange 28 d of the shift member 28 </ b> B facing the cutout portion 28 c, the second flange 28 e at the lower side end that is on the lower side in the rotation direction of the shift member 28 </ b> B. The side corners are formed on the inclined flank 20 which is chamfered so that the cutout portion 28c becomes wider toward the second flange 28e. This is to prevent a problem that the ridge-side clutch 28 cannot be turned on even when the ridge-side clutch lever 30 is moved to the on position when the ridge-side clutch 28 is in the disengaged state.
[0042]
The state in which the clutch 28 has been disengaged during the ridge is such that when the phase of the cutout portion 28c matches the position of the operation member 28C, the operation member 28C rotates and the cam portion 28f pushes the second flange 28e in the axial direction. Therefore, in the disengaged state of the ridge-side clutch 28, as shown in FIG. 8B, the cam portion 28f enters the notch portion 28c. In this disengaged state, if the clutch lever 30 is operated to the entry side during the ridge, the operating member 28C is urged to return to the clutch engagement side by the urging force of the return spring 28F. In some cases, the projection (pin corner portion) at the boundary with d happens to contact the end face of the first flange 28d.
[0043]
Then, in the related art, since the end face of the first flange 28d is simply cut in the vertical direction, when the shift member 28B returns to the clutch engagement side and rotates, the projection portion is perpendicular to the first flange 28d. In some cases, the operation member 28C cannot be rotated to the clutch engagement side, that is, the engagement operation of the ridge-side clutch cannot be performed.
[0044]
On the other hand, in the case of the present application, the lower end of the first flange 28d is formed on the inclined flank 20 as shown in FIG. 8 (c). Even when the protruding portion of the portion 28f is in contact with the lower end of the first flange 28d, the protruding portion can rotate and move in the surface direction of the inclined flank 20 (the direction along the surface). Therefore, the cam portion 28f can be smoothly returned to the clutch engagement side without being caught, and the engagement operation of the clutch 28 at the time of the ridge by the urging force of the return spring 28F can be executed without any trouble.
[0045]
In the rice transplanter according to the present invention, the first angle θ1 which is the stop position angle range of the well-known fixed position stop type planting clutch 21 (see FIG. 1) and the stop position angle of the fixed position stop type ridge side clutch 28 described above. The relative angular position with respect to the second angle θ2, which is the range, is set in a relationship as shown in FIG. That is, by means such as shifting the spline fitting between the gear and the shaft by one or two teeth, the second angle θ2 in the movement trajectory T of the planting claw 14A starts before the first angle θ1, and The first angle θ1 is included in the second angle θ2. Incidentally, conventionally, the starting points of the second angle θ2 and the first angle θ1 are set at the same position in design.
[0046]
With this relative angle range setting, when the planting clutch is disengaged, the positional relationship in which the cam portion 28f can enter the cutout portion 28c always appears when the planting clutch is disengaged. The structure is such that the ridge-side clutch 28 can be reliably turned off. Therefore, the cam portion 28f (the protruding portion) and the first flange 28d are brought into contact with each other so as to bite into each other, so that the inconvenience that the clutch 28 cannot be disengaged properly at the time of the ridge is improved.
[0047]
As shown in FIG. 3, the power transmission from the feed case 11 to the input shaft 26 of the planting transmission case 12 is performed via a shaft transmission mechanism including an intermediate shaft 22 and two couplings 23, 23. The two couplings 23, 23 are advantageous in terms of cost and have a simple structure, while absorbing a slight relative displacement or inclination between the output shaft (notation omitted) of the feed case 11 and the input shaft 26. While being able to transmit.
[Brief description of the drawings]
FIG. 1 is an overall side view of a rice transplanter. FIG. 2 is a front view of a seedling planting apparatus. FIG. 3 is a schematic plan view of a seedling planting apparatus showing an operation structure of a ridge-side clutch. FIG. FIG. 5 is a longitudinal rear view of a main part showing an operating state of a ridge-side clutch for planting. FIG. 6 is an exploded perspective view of a main part showing a configuration of a ridge-side clutch for planting. FIG. 7 is a longitudinal sectional side view of a main part showing a configuration of a ridge-side clutch for planting. FIG. 8 is a cross-sectional plan view of a main part showing an operating state of a ridge-side clutch for planting. FIG. 9 is a shift member and a torque limiter. FIG. 10 is a longitudinal sectional side view of a main part showing a configuration of an input portion of a vertical feed mechanism. FIG. 11 is a view showing a relative relationship between a planting clutch stop range and a ridge-side clutch stop range. Description】
Reference Signs List 11 feed case 12 planting transmission case 14 planting mechanism 20 inclined flank 21 planting clutch 28 ridge-side clutch 28B shift member 28C operating member 28c notch 28d first flange 28e second flange 28f cam portion 30 ridge-side clutch lever P Axis center θ1 Stopping position angle range of planting clutch θ2 Stopping position angle range of ridge-side clutch

Claims (2)

A ridge-side clutch structure of a rice transplanter, which is configured to be able to plant a fraction of a row by switching a corresponding ridge-side clutch with a plurality of ridge-side clutch levers,
The relative angle position between the two stop position angle ranges is set so that the stop position angle range for setting the clutch to disengage the ridge at the ridge starts before the stop position angle range for setting the clutch for disseminating the planting clutch. The set-up clutch structure on the ridge of the rice transplanter that has been set . A planting ridge clutch provided in each branch transmission system that branches and transmits power from the feed case to a planting mechanism supported by each planting transmission case, a transmission connected to the transmission system on the feed case side. A shift member movable between a position and a non-transmission position separated from the transmission system on the feed case side, and urged to return to the transmission position, and around an axis perpendicular to the moving direction of the shift member. A first flange having a notch formed in a predetermined position on the outer periphery of the shift member, and a predetermined flange extending from the first flange to the non-transmission position side. A second flange provided at an interval, the operation member being provided with the first flange and the second flange in a state where the operation member is allowed to rotate around the axis only when adjacent to the notch; When While engaged between, to form a cam portion of the semicircular presses the shift member in accordance with the rotation in the axis around said operating member in the non-transmission position,
Of the pair of end faces facing the notch in the first flange, the second flange side corner of the lower end, which is the lower side in the rotation direction of the shift member, is moved forward with the notch facing the second flange. 2. The ridge-side clutch structure of a rice transplanter according to claim 1, wherein the flank is formed on an inclined flank which becomes wider.

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