JP3770940B2 - Transplanter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of transplanters such as rice transplanters.
[0002]
[Prior art]
In this type of transplanter, an inconstant speed motion mechanism that causes speed fluctuations in the locus motion of the planting claw is interposed in the power transmission path of the planting claw mechanism, so that the planting claw is not changed. A technique for changing the ground motion speed is already known.
[0003]
[Problems to be solved by the invention]
By the way, in such a transplanter, when an overload acts on the planting claw, a torque limiter that cuts off the power transmission to the planting claw is provided. In the case where the mechanism is interposed, the load of the planting claw transmitted to the torque limiter may fluctuate by the inconstant speed motion mechanism, causing the torque limiter to malfunction. In addition, after the torque limiter is activated, if the torque limiter returns to the connected state regardless of the speed fluctuation timing of the inconstant speed movement mechanism, the speed fluctuation timing of the inconstant speed movement mechanism will be shifted and planting will occur. There was a possibility of reducing accuracy.
[0004]
[Means for Solving the Problems]
The present invention was created for the purpose of providing a transplanter capable of solving these problems in view of the above circumstances, and the invention of claim 1 is directed to the locus movement of the planting nail. In the transplanting machine for transplanting transplanted seedlings, an inconstant motion mechanism that causes a speed fluctuation in the locus motion of the planting claw is interposed in the power transmission path of the planting claw, and the inconstant motion mechanism Upon Ru provided a torque limiter to the downstream side of the transmission path than the torque limiter is characterized in that the arrangement of the meshing claws so that a pair of clutch members are mutually engaged only at one position of one rotation is set It is a transplanter. In other words, since the load of the planting claw is transmitted to the torque limiter without passing through the inconstant speed motion mechanism, the operating accuracy of the torque limiter can be improved, and the operating torque of the torque limiter can be increased. As a result, it is possible to reduce the possibility of member damage due to overload without increasing the strength of the member even though it is equipped with an inconstant speed motion mechanism. can do.
[0005]
A second aspect of the present invention is the transplanter according to the first aspect, wherein the connection timing of the torque limiter is adjusted to a cycle in which the speed of the inconstant speed motion mechanism varies . In other words, even if the torque limiter is activated, there is no deviation in the cycle of fluctuations in the speed of the inconstant speed motion mechanism, so that it is possible to plant with high accuracy based on the motion trajectory as initially set. The trouble of adjusting the timing each time the torque limiter operates can be eliminated.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a planting work unit connected to a rear part of a riding type rice transplanter via a lifting link mechanism, and the planting work unit 1 includes a working unit frame 2 connected to the lifting link mechanism, A seedling table 3 supported by the working unit frame 2 so as to be able to reciprocate left and right, a transmission case assembly 4 assembled integrally with the working unit frame 2, a float 5 disposed below the transmission case assembly 4, and the like These basic configurations are all conventional.
[0007]
The transmission case assembly 4 includes a drive case 7 having an input shaft 6, a distribution case 8 projecting left and right from the drive case 7, and a plurality of planter cases 9 projecting rearward from the distribution case 8. The power input by the input shaft 6 (the machine-side PTO power whose relative speed with respect to the vehicle speed is changed according to the stock adjustment) is transferred to a planting drive shaft (planting drive shaft) 10 supported by the drive case 7. After being transmitted through the bevel gear mechanism 11, it is transmitted to a distribution shaft (distribution shaft) 12 that is supported in the distribution case 8 and a longitudinal feed shaft 13 that is supported by the drive case 7, and further to the distribution shaft 12. The transmitted power is transmitted in a distributed manner to the planter shaft 14 that is supported at the tip of each planter case 9 via a chain transmission mechanism 15.
[0008]
When power is transmitted to the vertical feed shaft 13, the vertical feed drive cam 13a at one end reaches the turning point of the horizontal feed at the operating lever of the vertical feed mechanism (not shown) provided on the seedling table 3. The mat seedling on the seedling table 3 is vertically fed on the basis of the operation of the vertical feed mechanism accompanying the hitting operation. The power of the vertical feed shaft 13 is configured on the other end side. It is also transmitted to the screw shaft 17 through the lateral feed speed change mechanism 16.
[0009]
A slide block 18 is screwed onto the screw shaft 17 in an outer fitting manner. The slide block 18 is integrally connected to the seedling table 3 via a slide bar 19. In other words, when the slide block 18 reciprocates left and right as the screw shaft 17 rotates in one direction, the seedling table 3 is laterally fed in conjunction with the slide block 18, and is thus placed on the seedling table 3. The lower end of the mat seedling slides along the apron 20 where the scraping opening 20a is formed.
[0010]
On the other hand, reference numeral 21 denotes a rotary case provided at one end portion or both left and right end portions of the planter shaft 14, and the rotary case 21 rotates integrally with the planter shaft 14. And a sun gear 22 that is rotatably supported and is engaged with the planter case 9 to be prevented from rotating. A pair of intermediate gears 23 are engaged with the sun gear 22 at positions shifted by 180 degrees, and each intermediate gear 23 is engaged with a planetary gear 24.
[0011]
Reference numeral 25 denotes a planter arm having a planting claw (planter beak) 26, and a cylindrical shaft 27 protruding integrally with a base end portion of the planter arm 25 is rotatable at both end portions of the rotary case 21. And is spline-coupled to each planetary gear 24. That is, when the planter shaft 14 is rotated to perform the planting operation, the rotary case 21 rotates along with the rotation, and the intermediate gear 23 rotates while revolving around the fixed sun gear 22. Since the planetary gear 24 meshed with the intermediate gear 23 rotates in the reverse direction, the planter arm 25 integrally coupled to the planetary gear 24 revolves around the planter shaft 14 while rotating the cylindrical shaft 27. The planter arm 25 rotates in the opposite direction as the center, and the posture of the planter arm 25 is always directed toward the seedling stage 3 regardless of the rotation of the rotary case 21.
[0012]
The sun gear 22, the intermediate gear 23, and the planetary gear 24 are all formed as eccentric gears. That is, after the planting claw 26 scrapes off the seedling from the seedling platform 3, it reaches a planting position in the soil while drawing an arc that swells forward, and then rises linearly and rises in a semicircular shape (travel stop) The angular speed of the eccentric gear is set so as to draw the tip movement locus at the time, but when one planting claw 26 scrapes off the seedling from the seedling table 3, the other planting claw 26 plantes at the same time. In addition, when the other planting claw 26 scrapes off the seedling from the seedling table 3, the position setting and locus setting of the planting claw 26 are performed so that one planting claw 26 executes planting at the same time. Therefore, every time the rotary case 21 makes one rotation, planting is performed twice.
[0013]
Reference numeral 28 denotes a camshaft that is supported in the cylindrical shaft 27. The base end of the camshaft 28 is integrally fixed to the rotary case 21, and the tip of the camshaft 28 extends through the planter arm 25. A facing cam 28a is integrally formed. On the other hand, 29 is a planter fork which can be moved forward and backward along the inner surface of the planting claw 26, and the rod 29a constituting the base end side of the planter fork 29 is always urged backward by the ammunition machine 30. The other end is engaged with one end of the swing arm 31 that contacts the cam 28a. When the planting operation accompanying the rotation of the rotary case 21 is performed, the large-diameter portion of the cam 28a presses the other end side of the swing arm 31 when the planting claw 26 reaches the planting position, and interlocks with this. A seedling is pushed out from the planting claw 26 based on the forward operation of the planter fork 29.
[0014]
Reference numeral 32 denotes an inconstant speed motion mechanism interposed between the planting drive shaft 10 and the distribution shaft 12, and the inconstant speed motion mechanism 32 includes a pair of non-circular gears 33 that mesh with each other. By performing power transmission via 34, periodic speed fluctuations are generated in the power transmitted to the planting claw 26. That is, the non-uniform speed movement mechanism 32 increases the scraping movement speed and the soil movement speed without changing the overall speed (planting cycle) of the planting claw 26, while holding the scraped seedling. Although provided to decelerate the motion speed in the intermediate motion range, a plurality of speed control mechanisms 32 are provided in the transmission path on the upper side of the distribution shaft 12 that distributes the power to each planter shaft 14. The movement speed of the planting claw 26 (rotary case 21) can be made unequal at one place. As a result, the structure can be simplified and the inter-specification specification can be changed at one place. Be able to.
[0015]
Further, the non-circular gears 33, 34 integrally have a pair of transmission gear portions 33 a, 33 b, 34 a, 34 b having different speed fluctuation rates, and are non-circular on the drive side that is spline fitted to the planting drive shaft 10. By sliding the gear 33 (operating the shifter 35), the combination of gear portions to be meshed can be switched. That is, since the speed of movement in the speed increasing area and the speed reducing area can be switched without changing the overall speed (planting cycle) of the planting claw 26, selection according to work conditions (between planting stocks, etc.) is possible. As a result, the movement trajectory (running trajectory) of the planting claw 26 can be adapted to the working conditions to improve the planting accuracy.
[0016]
The chain transmission mechanism (deceleration mechanism) 15 that transmits power from the distribution shaft 12 to each planter shaft 14 includes a drive-side sprocket 15a integrally provided on the distribution shaft 12 side and a planter clutch on the planter shaft 14 side. The transmission chain 15c is suspended from the driven sprocket 15b connected via the mechanism 36. The reduction ratio of the chain transmission mechanism 15 is the number of planting claws 26 provided in each rotary case 21. It is set to an integral multiple of (the number of plantings during one rotation of the rotary case 21). That is, in order to increase the number of speed fluctuations generated by the inconstant speed motion mechanism 32 to an integral multiple of the number of planting claws 26, the number of speed fluctuations of the inconstant speed motion mechanism 32 is increased. Since it can respond based on the reduction ratio setting of the chain transmission mechanism 15 without changing according to the number of speeds, and can generate any number of speed fluctuations within the planting cycle, The running trajectory can be set easily.
[0017]
Further, reference numeral 37 denotes a torque limiter interposed in the power transmission path of the planting claw 26. The torque limiter 37 is a pair of clutch bodies 37a that mesh with each other between the inclined surfaces (in this embodiment, the non-driven side non-driven side). The circular gear 34 is rotatably supported by the distribution shaft 12 and also serves as one clutch body), and the other clutch body 37a that is spline-fitted to the transmission shaft (distribution shaft 12 in this embodiment) is connected to one clutch body ( It is configured using an ammunition machine 37b that presses and urges it toward the driven side non-circular gear 34). When an overload acts on the planting claw 26, the other clutch body 37a is separated from the one clutch body against the urging force (set torque) of the ammunition machine 37b to cut off the power transmission. Although configured as described above, the interposed position of the torque limiter 37 in the power transmission path of the planting claw 26 is set on the lower side than the inconstant speed motion mechanism 32. That is, since the load of the planting claw 26 is transmitted to the torque limiter 37 without passing through the inconstant speed motion mechanism 32, the operating accuracy of the torque limiter 37 can be improved and the operating torque of the torque limiter 37 can be improved. Can be set as small as possible, and as a result, it is possible to increase the strength of the members in particular while the unequal speed motion mechanism 32 is provided in the power transmission path of the planting claw 26. Therefore, the member can be prevented from being damaged.
[0018]
Further, the clutch claws 37a of the torque limiter 37 are arranged with meshing claws 37c so as to mesh with each other only at one place in one rotation. That is, since the connection timing of the torque limiter 37 matches the speed fluctuation timing of the inconstant speed motion mechanism 32, that is, the speed fluctuation period , even if the torque limiter 37 is activated, the speed of the inconstant speed motion mechanism 32 is increased. There is no deviation in the fluctuation timing, and as a result, it is possible to perform planting with high accuracy based on the motion trajectory as initially set, and the trouble of performing timing adjustment each time the torque limiter 37 is operated. It can be solved.
[0019]
In the configuration as described above, the planting claw 26 provided in the rotary case 21 performs a predetermined trajectory motion as the rotary case 21 rotates, and scrapes the seedling from the seedling mounting base 3 based on the trajectory motion. At the same time, the scraped seedlings are planted in the soil. An inconstant speed motion mechanism 32 is provided in the transmission path for transmitting power to the rotary case 21, and the speed increasing area is set in the planting claw 26. Therefore, it is possible to increase the soil motion speed without changing the overall speed (planting cycle) of the planting claw 26. Therefore, as shown in FIG. 5, even if the overall speed of the planting claw 26 is reduced so as to perform the work between wide stocks (for example, 24 cm), it is possible to ensure a necessary motion speed in the soil. In other words, after planting seedlings, it is possible to correct a conventional running trajectory (tip motion trajectory during travel) in which the planting claws 26 drag the planted seedlings, thereby making it possible to deal with wide stocks. Further, when the planting claw 26 scrapes off the seedling from the seedling stage 3, the movement speed is increased, so that the lateral feed amount of the seedling stage 3 during the scraping is conventionally increased as shown in FIG. As a result, it is possible to improve the seedling holdability of the planting claw 26 by minimizing the collapse of the floor soil of the mat seedling.
[0020]
As described above, in the present invention, the inconstant speed motion mechanism 32 is provided in the power transmission path of the planting claw 26, but rather than the distribution shaft 12 that distributes power to each planter shaft 14. Since the non-uniform speed motion mechanism 32 is interposed in the transmission path on the upper side, the motion speed of the plurality of planting claws 26 (rotary case 21) can be made non-uniform at one place. Therefore, it is possible to simplify the structure as compared with the conventional case in which a plurality of inconstant speed motion mechanisms are provided, or it is possible to change the inter-stock specifications and the like at one place.
[0021]
In addition, since the speed fluctuation rate of the inconstant speed motion mechanism 32 can be switched, it becomes possible to select a speed fluctuation rate according to the work conditions (between planting stocks, etc.). The locus (running locus) can be adapted to the working conditions and can be planted with high accuracy.
[0022]
Further, the reduction ratio of the chain transmission mechanism 15 provided on the lower transmission side of the non-uniform speed movement mechanism 32 is set to the number of planting claws 26 provided in each rotary case 21 (the number of planting operations during one rotation of the rotary case 21). Therefore, the number of speed fluctuations generated by the non-uniform speed motion mechanism 32 can be increased to an integral multiple according to the number of planting claws 26. Therefore, it is not necessary to change the number of speed fluctuations of the inconstant speed motion mechanism 32 according to the number of planting claws 26, and the inconstant speed motion mechanism 32 can be simplified, downsized, and cost reduced. In addition, since it is possible to cause a speed fluctuation any number of times within the planting cycle, there is also an advantage that a desired running locus can be easily set.
[0023]
Further, when the torque limiter 37 is interposed in the power transmission path of the planting claw 26, the insertion position is set on the lower side than the inconstant speed motion mechanism 32, so that the load on the planting claw 26 is not increased. The torque is transmitted to the torque limiter 37 without going through the constant velocity motion mechanism 32. Therefore, the operation accuracy of the torque limiter 37 can be improved by avoiding inconvenience that the inconstant speed motion mechanism 32 fluctuates the load of the planting claw 26 transmitted to the torque limiter 37, or the operation of the torque limiter 37. The torque can be set as small as possible. As a result, the strength of the member is increased while the unequal speed motion mechanism 32 is interposed in the power transmission path of the planting claw 26. Therefore, it is possible to prevent member damage due to overload.
[0024]
Further, since the clutch body 37a of the torque limiter 37 is arranged with the meshing claws 37c so as to mesh with each other only at one place in one rotation, the connection timing of the torque limiter 37 is an inconstant speed motion mechanism. The speed fluctuation timing of 32 , that is, the speed fluctuation period is surely matched. Therefore, when the torque limiter 37 is activated, it is possible to prevent the speed fluctuation timing of the inconstant speed motion mechanism 32 from being shifted, and as a result, the torque limiter 37 is activated as long as good planting accuracy can be maintained. The trouble of adjusting the timing every time can be eliminated.
[Brief description of the drawings]
FIG. 1 is a development view showing a power transmission path of a planting part.
FIG. 2 is a side view of an essential part of a planting part.
FIG. 3 is a partially cutaway side view of a planter case and a rotary case.
FIG. 4 is a plan sectional view of the same.
FIG. 5 is an operation explanatory diagram showing a locus of a planting claw.
6A is a cross-sectional view of a mat seedling showing a conventional scraped state, and FIG. 6B is a cross-sectional view of a mat seedling showing a scraped state of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Planting work part 3 Seedling stand 9 Planter case 10 Planting drive shaft 12 Distribution shaft 14 Planter shaft 15 Chain transmission mechanism 21 Rotary case 25 Planter arm 26 Planting claw 32 Non-uniform speed motion mechanism 37 Torque limiter

Claims (2)

In the transplanting machine for planting a transplanted seedling based on the locus movement of the planting nail, an inconstant speed motion mechanism that causes a speed fluctuation in the locus motion of the planting nail is interposed in the power transmission path of the planting nail. , when Ru is provided a torque limiter to the downstream side of the transmission path than unmoving constant velocity motion mechanism, the torque limiter, the arrangement of the meshing claws to mutually engaged only in one place of the pair of clutch members is one revolution is set A transplanting machine characterized by that . The transplanter according to claim 1, wherein the connection timing of the torque limiter is matched with a cycle in which the speed of the inconstant motion mechanism varies .

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