JP2006136287A - Power transmission structure of seedling transplanting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the structure and reduce the weight of a power transmission structure of a seedling transplanting apparatus. <P>SOLUTION: The input case 7 of the power transmission structure is provided with a power-receiving transmission shaft 11 in the longitudinal state and a lateral transfer shaft 13 extended in the lateral direction and laterally reciprocating a seedling table 3. The lateral transfer shaft 13 is interlocked with the transmission shaft 11 through a bevel gear mechanism 14 and the rotation of the lateral transfer shaft 13 is reduced in a plurality of stages by the bevel gear mechanism 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission structure for driving a seedling planting device connected to a rice transplanter so as to be movable up and down.

As the transmission structure of the seedling planting device, a long and long planting frame that is fixed to the seedling planting device is equipped with a feed case to which the working power taken out from the aircraft is transmitted and a planting mechanism at the rear. After connecting and supporting the planting case, the power input from the front to the feed case is transmitted to the horizontal intermediate shaft, then the power of the intermediate shaft is transmitted to the output shaft that is supported laterally at the rear of the feed case. The output shaft and the input shaft horizontally mounted on the front of the planting case are linked to each other, and the power input to the front of the planting case is transmitted to the planting drive shaft horizontally supported on the rear of the planting case via the chain. The horizontal feed shaft that reciprocally moves the seedling table back and forth is horizontally supported by the feed case, and the horizontal feed shaft and the intermediate shaft are gear-linked. Known (e.g., see Patent Document 1).
JP-A-10-66424

  The above transmission structure can reliably drive the planting mechanism and the lateral feed drive of the seedling platform, but it has many parts for transmission and the weight of the entire transmission structure increases. It was disadvantageous in terms of weight and cost for a small model with a small number (about 4).

  This invention is made paying attention to such a point, and it aims at simplification and weight reduction of the transmission structure in a seedling planting apparatus.

  In the first invention, the input case is equipped with a transmission shaft that receives power in a front-rear orientation, and a horizontal feed shaft that reciprocally moves the seedling table is supported horizontally on the input case. The transmission shaft and the bevel gear mechanism are directly interlocked and connected, and in the bevel gear mechanism, the lateral feed shaft is configured to be capable of shifting in a plurality of stages.

  According to the above configuration, it is possible to drive the transverse feed shaft at a variable speed without passing the power of the transmission shaft through the transverse intermediate shaft. In this case, for example, a plurality of bevel gear pairs with different transmission ratios that are always meshed between the transmission shaft and the transverse feed shaft are mounted, and only one of the bevel gear pairs is selected to perform transmission. If the mechanism is configured, it is possible to perform speed change by compact bevel gear transmission without gear shift.

  Therefore, according to the first aspect of the invention, the input case can be reduced in size and weight because the transmission system of the transverse feed shaft is simplified, and can be effectively used for a small machine having a small number of planting lines.

According to a second invention, in the first invention,
The rear part of the transmission shaft is configured as an output part for driving the planting mechanism.

  According to the said structure, a transmission shaft can be functioned as an input shaft with respect to an input case, and the output shaft for a planting mechanism drive, and the said effect of 1st invention is promoted by sharing a member.

According to a third invention, in the first or second invention,
The input case is divided into left and right, and the axis of the transmission shaft is located on the divided surface.

  According to the above configuration, since the transmission shaft and the bevel gear mechanism can be arranged between the input case portions that are divided and opened, the case connecting process can be performed, so that the assembling workability is high.

A fourth invention is the invention according to any one of the first to third inventions,
In the bevel gear mechanism, the transverse feed shaft is configured to be driven to decelerate.

  According to the above configuration, the transmission direction conversion and deceleration from the transmission shaft to the lateral feed shaft can be performed in one place, which is effective for reducing the size and weight of the case.

A fifth invention is the invention according to any one of the first to fourth inventions,
The lateral feed shaft is provided with a seedling feed driving arm for operating a seedling feed belt provided on the seedling platform at a lateral feed stroke end of the seedling platform.

  According to the above configuration, a dedicated rotating shaft for driving and rotating the seedling feed driving arm is not necessary, which is effective in reducing the size of the input case.

  FIG. 1 shows a side view of a seedling planting apparatus 1 that is connected to the rear part of the riding rice transplanter. This seedling planting device 1 is configured in a four-row planting specification, and is connected to a lower end of a lifting link mechanism provided to be capable of driving up and down on a left traveling vehicle body outside the figure so as to be freely rollable. Four sets of rotary seedlings that place four seedlings of mat seedlings and move back and forth horizontally with a fixed stroke, and cut out seedlings from the lower end of this seedling setting table 3 and plant them on the rice field. Planting mechanism 4, three leveling floats 5 arranged in parallel to level the planting locations on the surface, and the like.

  As shown in FIG. 2, the lower part of the seedling planting device 1 is equipped with a square tube-shaped planting frame 6, and an input case 7 is connected to the left and right middle portion of the planting frame 6, and the input case 7 A stay 8 having a sheet metal structure is extended rearward from the left and right portions of the left and right, and a planting drive case 9 is connected and supported between rear portions of the stays 8. The right and left sides of the planting drive case 9 are equipped with two central strips of the planting mechanism 4 and one outer strip on the inner side of the rear portion of the support frame 10 extending rearward from the left and right locations of the planting frame 6. Thus, the four planting mechanisms 4 are arranged in parallel at predetermined intervals.

  The input case 7 is configured in a left-right divided structure, and a transmission shaft 11 that passes in the front-rear direction with an axial center positioned on the case division surface E is supported by penetration. The front end portion of the transmission shaft 11 is provided in front of the case as an input shaft 11a, and power from a PTO shaft (not shown) provided at the rear portion of the traveling machine body is transmitted to the input shaft 11a via the transmission shaft 2. Further, the rear portion of the transmission shaft 11 is greatly extended to the rear of the case as an output shaft to the planting drive case 9, and the rear portion thereof is directly inserted into the planting drive case 9.

  Further, a lateral feed shaft 13 for driving the seedling table lateral feed is laterally supported across the left side surface of the input case 7 and the bearing bracket 12 provided at the left end portion of the planting frame 6. The case entry portion and the transmission shaft 11 are meshed with each other via a bevel gear mechanism 14.

  A reciprocating spiral groove 15 is formed in the transverse feed shaft 13, and a slider 17 having an engaging member 16 engaged with the reciprocating spiral groove 15 so as to be able to rotate is fitted to the transverse feed shaft 13 so as to be slidable horizontally. The seedling bed 3 is connected to the slider 17 via a connecting member 8, and the slider 17 is reciprocated along the transverse feed shaft 13 with a constant stroke by rotating the transverse feed shaft 13 in a fixed direction. Then, along with this, the seedling setting table 3 reciprocates horizontally.

  The lateral feed shaft 13 is provided with a seedling feed driving arm 19 and continuously rotates a drive mechanism (not shown) provided on the back of the seedling platform whenever the seedling platform 3 reaches the stroke end. The seedling feed driving arm 19 is contacted and driven to rotate the seedling feeding belt mounted on the seedling placement portion of the seedling platform by a predetermined amount.

  Further, the bevel gear mechanism 14 has not only a function of changing the rotational power of the transmission shaft 11 to drive the lateral feed shaft 13 at a reduced speed but also a function of driving the lateral feed shaft 13 at a variable speed. That is, large and small driving bevel gears G1, G2 are loosely fitted to the transmission shaft 11, and driven side bevel gears G3, G4 meshing with the driving side bevel gears G1, G2 are fixed to the lateral feed shaft 13. A key groove 21 formed in the transmission shaft 11 incorporates a transmission key 22 that can be shifted in the axial direction and can be oscillated and displaced in the radial direction, and a spring 23 that pushes and urges the transmission key 22 radially outward. By shifting the transmission key 22 and selectively engaging one of the drive side bevel gears G1 and G2 from the inner periphery, the selected drive side bevel gears G1 and G2 and the driven side bevel gear G3 engaged therewith are selected. , G4 and the lateral feed shaft 13 are driven to decelerate at a gear ratio. In this way, by shifting the rotational speed of the lateral feed shaft 13 in two steps with respect to the rotational speed of the transmission shaft 11, the number of operations of the planting mechanism 4 with respect to the moving stroke of the seedling table 3, that is, the number of seedlings is reduced. As a result, the width of one stock to be cut out can be selected to be large or small.

  The rear end portion of the transmission key 22 is engaged and supported by a shift member 24a provided at the inner end portion of the speed change operation shaft 24 inserted into the input case 7, and the speed change operation shaft 24 is pushed and pulled back and forth. It is configured to shift the transmission key 22 by operating. Further, a pair of front and rear detent recesses 25 are formed on the inner side of the transmission key 22, and an engagement piece 26 provided at the end of the spring 23 is biased and engaged with any of the recesses 25. Thus, the transmission key 22 is stably held at the two shift positions, respectively.

  The planting transmission case 9 has a vertically divided structure, and the rear portion of the transmission shaft 11 is inserted and supported from the front of the case so that the shaft core is positioned on the split surface F. In the planting transmission case 9, a pair of left and right planting drive shafts 31 concentric with each other are horizontally supported and geared to the transmission shaft 11 in a decelerated state as will be described later. The planting mechanisms 4 for the central two strips are respectively mounted on the protrusions. The shafts of the transmission shaft 11, the lateral feed shaft 13, and the planting drive shaft 31 are arranged on a single plane including the dividing surface F.

  As shown in FIG. 7, a bevel gear G5 is loosely fitted in the planting drive case insertion portion of the transmission shaft 11, and a torque limiter 32 for limiting the transmission torque from the transmission shaft 11 to the bevel gear G5 is interposed. This torque limiter 32 is deeply engaged and held in the drive-side clutch member 33 that is spline-mounted on the transmission shaft 11 so as to be slidably displaceable, the driven-side clutch member 34 that is rotatably mounted integrally with the bevel gear G5, and the driven-side clutch member 34. A known ball-type jump clutch structure comprising a transmission ball 35 that is shallowly engaged with the end face of the drive-side clutch member 33 and a spring 36 that slidably biases the drive-side clutch member 33 toward the driven-side clutch member 34. If the load torque acting on the bevel gear G5 is less than the set value, the rotational power of the transmission shaft 11 is transmitted from the drive side clutch member 33 to the driven side clutch member 34 via the transmission ball 35, and is transmitted to the bevel gear G5. When the applied load torque exceeds the set value, the drive side clutch member 33 slides backward against the spring 36. It is power transmission through the transmission balls 35 are adapted to be shut off.

  A bevel gear G6 meshed with the bevel gear G5 is loosely fitted at the abutting portion of the left and right planting drive shafts 31. The boss portion 37 of each bevel gear G6 and each planting drive shaft 31 are connected via a saddle clutch 38. Linked together. Here, the bevel gear G6 is configured to have a larger diameter than the bevel gear G5 on the drive side, and transmission in a decelerated state is performed from the transmission shaft 11 to the planting drive shaft 31. Therefore, the torque limiter 32 operates at a rotational transmission part at a higher speed and lower torque than the planting drive shaft 31.

  The saddle clutch 38 is used to stop the left and right planting drive shafts 31 to stop some planting mechanisms 4 when planting a small number of strips, and can slide on the planting drive shaft 31. The clutch member 39 attached with the key is engaged with and disengaged from the end of the boss portion 37 in the bevel gear G6 from the axial direction, thereby being configured as a pawl clutch that intermittently transmits power from the boss portion 37 to the planting drive shaft 31. Each clutch member 39 is slidably biased toward the center of the case by a spring 40 and is engaged with the boss portion 37 to be held in a “clutch engaged” state.

  A climbing cam 41 is provided on the side surface of the clutch member 39, and an operation pin 42 penetratingly attached to the planting drive case 9 is caused to enter into a turning locus of the climbing cam 41 rotating at the clutch engagement position. The clutch member 39 is forcibly shifted in the clutch disengagement direction against the spring 40 by the cam action caused by the relative rotation of the position fixing operation pin 42 and the climbing cam 41, and the planting drive shaft 31 is stopped at a predetermined rotational phase. It has come to be.

  As shown in FIG. 8, the planting mechanism 4 for the two strips on the center side includes a rotary case 45 that is key-connected to the end of the planting drive shaft 31 and rotates integrally with the planting drive shaft 31. A claw case 46 pivotally supported on the laterally outer sides of both ends so as to be able to rotate about a horizontal axis, a planting claw 47 and a seedling pusher 48 attached to each claw case 46 are provided. The claw case 46 rotates once at a constant speed in the reverse direction in conjunction with one rotation at a constant speed in the forward rotation direction (counterclockwise in FIG. 1) by the planting drive shaft 31, so that the planting claw 47 rotates. At the time when the planting claw 47 brings the seedling cut out from the bottom of the seedling table into the field, the tip of the circulates and moves while drawing a vertically long trajectory S extending from the lower end outlet of the seedling platform 3 and the field surface. Pusher 48 Seedlings cutout protrudes activated first side separated from the planting claw 47 is configured to push useless in the ground, a description thereof detailed configuration and operation below.

  A fixed boss 49 connected and fixed to the stay 8 is provided at the shaft support portion of the planting drive shaft 31 in the planting drive case 9, and is loosely supported by the planting drive shaft 31 at the rotation center portion of the rotation case 45. A central gear G7 is provided, and this central gear G7 is engaged with the end of the fixed boss 49 to prevent rotation. In addition, a claw support shaft 50 connected to the claw case 46 is rotatably supported at both ends of the rotation case 45, and an eccentric first intermediate support shaft 51 and first Two intermediate support shafts 52 are provided. The first intermediate gear G8 loosely fitted to the first intermediate support shaft 51 is engaged with the center gear G7, and the second intermediate gear G9 loosely fitted to the second intermediate support shaft 52 is engaged with the claw support shaft 50. The transmission pin 53 engaged with the fixed final gear G10 and provided on the side surface of the second intermediate gear G9 is engaged with a radial drive groove 54 formed on the side surface of the first intermediate gear G8. Further, the gears G7 to G10 incorporated in the claw case 46 are all constituted by circular gears having the same diameter.

  According to the above configuration, when the rotating case 45 is rotated at a constant speed in the forward rotation direction, the rotating case 45 revolves around the axis a of the planting drive shaft 31 together with the rotating case 45 while being engaged with the fixed central gear G7. The first intermediate gear G8 rotates in the same direction as the revolution direction relative to the rotating case 45, and the second intermediate gear G9 eccentrically transmitted to the first intermediate gear G8 via the transmission groove 54 and the transmission pin 53 is provided. The first intermediate gear G8 rotates at an unequal speed in the same direction. The non-uniform speed rotation of the second intermediate gear G9 is transmitted in reverse to the final gear G10, and the claw support shaft 50 integrated with the final gear G10 is driven to rotate at a non-uniform speed in the direction opposite to the rotation direction of the rotating case 45. It is. In this way, when the rotating case 45 is rotated once at a constant speed in the forward rotation direction, the claw case 46 is rotated once at an unequal speed in the opposite direction and is provided at both ends of the rotating case 45. The pair of planting claws 47 are circulated and rotated with a vertically long trajectory S so that planting is performed twice.

  The planting mechanism 4 for the two outer strips supported by the left and right support frames 10 is composed of a pair of claw cases 46 having the same specifications as the central claw case 46 described above. It is driven by the planting mechanism 4.

  That is, on the outer surface of the claw case 46 in the center planting mechanism 4, the interlocking shaft 55 made of a cylindrical shaft is flanged concentrically with the claw support shaft 50 and extends laterally outward. A claw case 46 constituting the outer planting mechanism 4 is connected to the projecting end, and the outer claw case 46 is configured to rotate at a constant speed integrally with the central claw case 46. A cam shaft 56 for driving the seedling pusher is inserted into the rotation center c of the center and outer claw cases 46, and both cam shafts 56 are integrally connected by a connecting shaft 57 inserted through the interlocking shaft 55. ing.

  At the rear of the support frame 10 extended from the planting frame 6, a rotation arm 58 that is rotatable coaxially with the planting drive shaft 31 is mounted. At both ends of the rotation arm 58, an outer claw case 46 is attached. The cam shaft 56 is connected and fixed. That is, each cam shaft 56 does not rotate (spin) with respect to the rotating case 45 and the rotating arm 58, and the cam shaft 56 becomes a claw case by rotating the rotating case and the rotating arm 58 around the planting drive shaft axis a. It rotates relative to 46.

  As shown in FIG. 10, the seedling pusher 48 is attached to the tip of an extrusion rod 62 that is freely slidable to and retracted from the claw case 46 and is mounted in a protruding biased state by an internally mounted spring 61. The cam shaft 56 is driven to move in and out as follows.

  A driving lever 63 is mounted on the claw case 46 so as to be able to swing around the fulcrum b. The tip of the driving lever 63 and the rear end of the push rod 62 are interlocked and connected via a link 64, so that the driving lever 63 swings. When the push rod 62 is moved back and forth, the seedling pusher 48 is configured to reciprocate between a retracted position for cutting the seedling located on the nail root side and a push action position located on the tip of the nail. . A cam 65 for operating the base end portion of the drive lever 63 is provided on the cam shaft 56, and the claw case 46 rotates to rotate the cam shaft 56 relative to the base end portion of the drive lever 63. In the operating range where the planting claw 47 cuts off the seedling from the lower end of the seedling table 4 and brings it into the paddy field, the base end portion of the drive lever 63 rides on the cam 65 and the pushing rod 62 is retracted against the spring 61. When the planting claw 47 has moved down to the planting position, the base end of the drive lever 63 reaches the cam 65 falling phase, and the drive lever 63 is released from the cam 65 all at once. As a result, the push rod 62 rapidly projects by the spring 61, and the seedling held by the planting claw 47 is pushed out at once by the seedling pusher 48 and left in the field. That.

  [Other Examples]

  (1) As the planting mechanism 4, the rear end is supported by a swing link and a planting arm having a planting claw attached to the tip is driven and oscillated by a crankshaft, and the planting claw is circulated through a longitudinal rotation trajectory. A moving crank type can also be used.

  (2) In the above embodiment, when the left and right planting drive shafts 31 are concentrically arranged in the planting drive case 9 and provided with a pair of left and right hook clutches 38 that perform power interruption to each planting drive shaft 31. However, it is also possible to drive the planting mechanism 4 at both ends by arranging a single planting drive shaft 31 through the planting drive case 9. One clutch 38 is incorporated.

Side view of seedling planting device Plan view showing the transmission structure of the seedling planting device Side view showing the drive structure of the planting mechanism Side view showing the drive structure of the planting mechanism Cross-sectional plan view showing transverse feed structure Vertical side view showing the input part of the seedling planting device Transverse plan view of planting drive case Cross-sectional plan view showing the planting mechanism on the center side Transverse plan view showing the planting mechanism on the left Longitudinal side view of nail case

Explanation of symbols

3 Seedling stand 7 Input case 8 Stay 11 Transmission shaft 13 Lateral feed shaft 14 Bevel gear mechanism 19 Seedling feed drive arm 20 Seedling feed belt E Divided surface

Claims (5)

  The input case is equipped with a transmission shaft that receives power in a front-rear orientation, and a horizontal feed shaft that reciprocally moves the seedling table is horizontally supported on the input case. The horizontal feed shaft, the transmission shaft, and the bevel gear mechanism A transmission structure for a seedling planting device, wherein the bevel gear mechanism is configured such that the transverse feed shaft can be shifted in multiple stages.   The transmission structure of the seedling planting apparatus according to claim 1, wherein a rear part of the transmission shaft is configured as an output unit for driving a planting mechanism.   The transmission structure of the seedling planting device according to claim 1 or 2, wherein the input case is divided into left and right, and the axis of the transmission shaft is positioned on the divided surface.   The transmission structure of the seedling planting apparatus according to any one of claims 1 to 3, wherein the bevel gear mechanism is configured so that the transverse feed shaft can be driven at a reduced speed.   The seedling planting according to any one of claims 1 to 4, further comprising a seedling feeding drive arm that operates a seedling feeding belt provided on the seedling platform on a lateral feed stroke end of the seedling platform on the lateral feed shaft. Transmission structure of the device.

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