JP5444062B2 - Seedling planting equipment - Google Patents

Description

  The present invention comprises a planting claw, a seedling pushing tool for pushing out a seedling sandwiched between the planting claws, and a planting claw and a planting claw case for holding the seedling pushing tool. The present invention relates to a seedling planting device for scraping seedlings and planting them in soil.

  A seedling planting device provided in a rice transplanter scrapes and holds a predetermined amount of seedlings from a seedling platform on which a large number of seedlings to be planted are placed, and plants them in a paddy field. A seedling pusher that pushes out the seedling sandwiched between the two, and a rotating case that rotates at a constant speed while rotatably holding the planting claws.

  In such a seedling planting device, the rotation of the rotating case causes the planting claws attached to the rotating case to scrape the seedlings from the seedling mount at regular intervals, so that the tip is divided into bifurcated planting nails. Hold the seedling. Then, as the planting claws enter the paddy field, the seedling pushing tool pushes out the sandwiched seedling in the direction of the arrow to plant the seedling in the paddy field.

  The planting claw is rotating at a certain number of rotations at a certain distance from the rotation center of the rotating case, but since the rice transplanter is moving forward, the planting claw and the seedling pusher must enter the soil. As a result, the soil in the vicinity where the seedling is to be planted is scraped up by the frictional resistance between the planting claw and the seedling pushing tool and the soil, or the soil is kicked up by the seedling pushing tool. For this reason, a large depression (planting hole) is formed around the root of the planted seedling, the planting posture of the seedling becomes unstable, and the planted seedling falls down or remains planted at an angle. There was a problem that the growth and heading time varied, and as a result, the ripening level at the time of harvesting varied.

  Therefore, various techniques for stabilizing the seedling planting posture have been proposed.

JP-A-8-103131 JP 2006-180848 A

    In particular, in Patent Document 2, the cross-sectional shape of the seedling pusher is substantially U-shaped (arranged so that both ends of the U-shape are in contact with the planting claws), and the shape of the back surface is planted. Like the movement trajectory (arc) when the nail enters the soil, it is configured in an arc shape. Thus, the tip of the seedling pushing tool can smoothly enter the soil during planting, and the planting hole formed by the seedling pushing tool is made small.

  However, in the technique of Patent Document 2, no consideration is given to the case where the planting claw comes out of the soil. That is, the movement trajectory of the seedling pusher when the planting claw comes out of the soil is different from that at the time of entry, so the back of the seedling pusher kicks up the soil. For this reason, the size of the planting hole remains large, and the planting posture of the seedling has not been stabilized. In addition, the back of the seedling pusher is provided up to the lower end, and after planting the seedling, there was a problem that when the seedling pusher was extracted from the soil, the planted seedling was pushed forward (This is due to the fact that the movement locus of the seedling planting device is approximately γ (the third letter of Greek letters)). Then, the objective of this invention is providing the seedling planting apparatus which can stabilize the planting attitude | position of a seedling.

For this reason, the invention described in claim 1 includes a planting claw, a seedling pushing tool for pushing out the seedling sandwiched between the planting claws, and a planting claw case for holding the planting claw and the seedling pushing tool. , A seedling planting device for scraping a predetermined amount of seedlings from a seedling stand and planting them in the soil,
The seedling pusher is configured by joining an extruded piece that pushes the seedling in contact with the sandwiched seedling and a push rod that slides the extruded piece along the planting claw,
The extruded pieces formed so that the plate-shaped member cross-section view in a U shape, and two sides, I near between the two sides, is provided notches at the lower end The middle part and
The tip of the side portion is slidably brought into contact with the back surface of the planting claw, and the lower end of the push rod is fixed to the outer surface of the intermediate portion so as to coincide with the lower end of the intermediate portion. ,
To the side, the middle portion notch and continuously for providing a separate notch is formed in an arc shape notch said another overhangs downwardly, characterized in Rukoto.

According to a second aspect of the present invention, in the seedling planting device according to the first aspect, the cross-sectional area of the lower part of the push rod is made smaller than the upper part and the central part of the push rod .

Invention according to claim 3, in seedling planting apparatus according to claim 2, the lower portion of the push rod, the transverse cross section is scraped off so that the triangular, cross the lower part of the push rod While reducing the area,
An intermediate portion of the extruded piece is fixed to one side of a triangular shape below the push rod.

According to a fourth aspect of the present invention, in the seedling planting device according to any one of the first to third aspects, one end of the operating piece is rotatably attached to the upper end of the push rod, and the operation piece is rotated. A seedling planting device in which a cam is brought into contact with the other end which is a moving center, the operating piece is moved up and down by the rotation of the cam, and the push rod is moved up and down.
The cam includes two steps along the outer periphery, and one step is larger than the other step.

According to a fifth aspect of the present invention, in the seedling planting apparatus according to the fourth aspect , the two steps are provided at positions that are substantially symmetrical with respect to the rotation center of the cam.

Invention of Claim 6 is equipped with a crank type rice transplanter in the seedling planting apparatus of any one of Claims 1-3 .

According to the invention described in claim 1, the planting nail includes a planting claw, a seedling pushing tool for pushing out the seedling sandwiched between the planting claws, and a planting claw and a planting claw case for holding the seedling pushing tool, A seedling planting device that scrapes a predetermined amount of seedlings from a seedling stand and plants them in the soil, wherein a seedling pushing tool abuts the sandwiched seedlings and pushes out the seedlings, and transplants the extruded pieces. An extruded piece formed by joining a push rod that slides along a claw and having a plate-like member formed in a U shape in a cross-sectional view has two side portions, One of the I near between the sides, is composed of a middle portion of the cutout on the edge is provided, causes slidably contact the front end of the side on the back of the planting claw, the outer surface of the intermediate portion , the friction between the intermediate portion of the lower end and the matching way to fixed the lower end of the push rod Runode, pushing piece of the soil when the get out of the soil It is possible to reduce the resistance, it is possible to reduce the amount kicking the soil due to the exit. As a result, unsoiled soil can be left, and the size of the dent due to taking out of the soil formed near the root of the planted seedling can be reduced. Therefore, it is possible to provide a seedling planting apparatus that stabilizes the seedling planting posture.

  Moreover, when a notch is formed in the lower part of the extruded piece, when the seedling is planted in the soil, the volume by which the extruded piece enters the soil can be reduced. This also makes it possible to reduce the depression formed around the planted seedling.

In addition , another cutout is provided on the side part in continuation with the cutout in the middle part, and the other cutout is formed in an arc shape projecting downward, so that the extruded piece that has entered the soil can be smoothly removed. It is possible to reduce the amount of soil that is taken up and the soil near the roots of the seedlings is scraped. Therefore, it is possible to provide a seedling planting apparatus that further stabilizes the seedling planting posture.

According to invention of Claim 2 , since the cross-sectional area of the lower part of a push rod is made smaller than the upper part and center part of a push rod, the side area of a push rod is reduced and the frictional resistance between soil is reduced. can do. Therefore, it is possible to reduce the amount of the push rod that lifts up the soil near the root of the seedling, and it is possible to provide a seedling planting apparatus that further stabilizes the seedling planting posture.

According to the third aspect of the present invention, the lower portion of the push rod is scraped off so that the cross-sectional view thereof is a triangular shape, the cross-sectional area of the lower portion of the push rod is reduced, and the lower portion of the push rod is triangular. Since the intermediate portion of the extruded piece is fixed to one side of the shape, the extruded piece can be reliably fixed to the push rod with a simple configuration. In addition, the area where the seedling blocks come into contact with the soil increases, and it becomes easier to apply the seedling floor soil to the soil in the field.

According to the fourth aspect of the present invention, one end of the operating piece is rotatably attached to the upper end of the push rod, the cam is brought into contact with the other end that is the center of rotation of the operating piece, and the rotation of the cam A seedling planting device in which the operating piece moves up and down and the push rod moves up and down, and the cam has two steps along the outer circumference, and one step is larger than the other step, so Push can be added. In particular, the soil (at the time of planting) attached to the planting nails can be wiped off, and when the seedlings are scraped off from the seedling platform, the seedlings can be appropriately held between the planting nails.

According to the fifth aspect of the present invention, since the two steps are provided at positions that are substantially symmetrical with respect to the rotation center of the cam, the distortion caused by the negative torque caused by the rotation of the cam cancels the rotation case. Thus, the rotating case can be rotated stably.

According to the invention described in claim 6 , since it is provided in the crank type rice transplanter, the seedling planting apparatus that stabilizes the seedling planting posture with a simple configuration without using a large configuration using a rotating case. Can be realized.

It is a side view of a rice transplanter provided with the seedling planting apparatus of an example of this invention. FIG. FIG. It is an enlarged side view of the seedling planting device vicinity. (A) is an expanded sectional view of a seedling planting device, (b) is a partially enlarged view of (a). (A) is a side view of the lower part of the planting nail, (b) is a view from the arrow A in (a), (c) is a view from the arrow B in (a), and (d) is a cross-sectional view from the arrow C in (c). FIG. (A)-(d) is a figure explaining the operation | movement which a seedling planting apparatus plants a seedling in soil. In another example of the present invention, (a) is an enlarged sectional view of a seedling planting device, and (b) is a partially enlarged view of (a). (A) is a figure which shows the relationship between a rotation case and a seedling planting apparatus, (b) is a figure which shows the radius which changes when two cams with which a seedling planting apparatus is equipped rotate.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. 1 and 2 are a side view and a plan view of a rice transplanter in which an example of the seedling planting device of the present invention is attached to a driving vehicle. The outline of rice transplanter is as follows. A vehicle body frame 11 of a traveling vehicle body (driving vehicle) 10 on which an operator rides is provided with an engine 12 at the front and a transmission case 13 at the rear, and traveling on paddy fields via front axle cases 14 on both front sides of the transmission case 13. The front wheel 15 is supported, and the rear wheel 17 for paddy field traveling is supported on both sides of the rear part of the transmission case 13 via the rear axle case 16. The engine 12 and its neighboring members are covered with a bonnet 18, and the mission case 13 and its neighboring members are covered with a vehicle body cover 20 having a step 19. A driver's seat 21 is attached to the upper portion of the vehicle body cover 20, and a steering handle 22 is provided in front of the driver's seat 21.

  At the rear of the traveling vehicle body 10, a rice planting machine (seedling planting machine) 30 including a seedling mounting table 31 for planting eight rows and a plurality of planting claws 32 is connected. This rice transplanter 30 is connected to the traveling vehicle body 10 using a three-point lifting link mechanism including a top link 33 and a lower link 34. And, it is configured to be movable up and down by an expansion and contraction operation of a hydraulic cylinder interposed between the rear portion of the traveling vehicle body 10 and the lower link 34. Further, the plate-shaped forward tilting seedling table 31 installed at the front height and the rear height is reciprocated with respect to the center and left and right planting transmission cases 37 via the lower guide rail 35 and the upper guide rail 36. It is supported freely. Below the planting transmission case 37, center and left and right planting flat floats 38 and 39 are supported via planting depth adjusting members. The planting work machine 30 is lowered and the floats 38 and 39 are landed to set the planting depth of the seedlings to be taken out from the seedling mat on the seedling mount 31 (FIG. 1, FIG. 1). In FIG. 2, the seedling mat is omitted). In the planting transmission case 37, the rotating shaft rotates with the driving force extracted from the PTO shaft of the traveling vehicle body 10.

  In FIG. 3, the front view of the rice transplanting machine 30 is shown. The rice planting machine 30 is integrally provided with eight seedling platforms 31A to 31H (one seedling platform corresponds to one line at the time of planting). Two conveyor belts B for conveying the seedlings downward are provided in parallel on the bottom bottom surfaces of the seedling platforms 31A to 31H. The conveyor belt B is made of a rubber endless belt, and has numerous small protrusions on the surface and protrusions formed at regular intervals on the back surface. The transport belt B rotates by engaging with a pair of plastic gears on the back side of each of the seedling platforms 31A to 31H. The drive shaft branched from the PTO shaft is engaged with the rotation shaft of the one gear through the gear.

  Four hopper units 73A to 73D, which will be described in detail later, are provided in front of the center of the seedling platforms 31A to 31H. The hopper units 73A to 73D are configured to supply chemicals and fertilizers to the seedling platforms 31A to 31H for two strips, respectively. Specifically, the hopper unit 73A is on the seedling platforms 31A and 31B, the hopper unit 73B is on the seedling platforms 31C and 31D, the hopper unit 73C is on the seedling platforms 31E and 31F, and the hopper unit 73D is on the seedling platforms 31G and 31H. It is configured to supply drugs and fertilizers.

  Each of the hopper units 73A to 73D has the same configuration, and includes a hopper tank, a medicine feeding roller unit, a discharge pipe, a spout, and the like. The hopper tank has a V-shaped center at the bottom when viewed from the front. The bottoms of both ends of the hopper tank are each provided with a medicine feeding roller part. The outer shell of the medicine feeding roller part is formed integrally with the hopper tank. And a transverse groove roller is rotatably provided inside. The transverse groove roller is for supplying a certain amount of medicine downward while rotating. A rotation drive shaft (not shown) branched from the PTO shaft is attached to the horizontal groove roller. By integrally molding the hopper tank and the medicine feeding roller part, water leakage at the connecting part, which has been a problem in the past (rain water enters from the connecting part, moistens the granular medicine, and the medicine feeding roller The problem of being stuck on the part) can be avoided.

  A lead-out pipe is attached to the lower end of each medicine feeding roller portion continuously. In this way, two lead-out pipes are attached to one hopper tank, and each lead-out pipe is responsible for the supply of chemicals to one seedling stand 31 (thus, one hopper tank has two strips of seedlings). The medicine is supplied to the mounting table 31). Specifically, a rod-shaped weed board (not shown) above the seedling stage 31 and above the spraying port is placed on the upper part of the rice seedlings that are transported downward on the seedling stage 31 when planting rice. In the conveying direction of the first seedling, and is provided over the entire width direction of the seedling mounting table 31) to bend the seedling upstream in the conveying direction. As a result, an open space is formed between the bent seedling and the seedling adjacent to the downstream side (the seedling that has already passed through the weed board and released from the deflection and stands upright), and sprayed toward this open space. Drugs are sprayed from the mouth.

  A spout is continuously provided at the lower end of the outlet pipe. The spray port has a double structure. That is, a cylindrical wheel is provided on the outside, and a nozzle is provided on the inside. A plurality of protrusions are provided on the outer periphery of the wheel. This protrusion comes into contact with the seedling placed on the seedling placing table 31. And the seedling stage 31 moves in the width direction to feed out the seedlings at the time of rice planting, so that the protrusion is caught by the seedlings, and the wheel outside the spraying port rotates. Therefore, the wheel rotates at a constant speed while the seedling stage 31 is feeding the seedling. One end of a scraper made of a wire is fixed to the wheel. The other end of the scraper is inserted into the nozzle. And a scraper rotates in a nozzle because a wheel rotates. By comprising in this way, it can prevent that a water | moisture content adheres to a nozzle exit, and the chemical | medical agent discharged | emitted from a sprinkling port is solidified by this water | moisture content around a sprinkling port.

  Further, four planting transmission cases 37 are fixedly provided in front of the lower parts of the seedling mounts 31 </ b> A to 31 </ b> H, and rotating cases 38 are provided at both ends of the planting transmission case 37. Furthermore, a seedling planting device (planting arm) 32 is rotatably provided one by one at the upper and lower ends of each rotating case 38. Therefore, two seedlings can be planted in one planting transmission case 37.

  As shown in FIG. 4, the planting transmission case 37 is for receiving the driving force from the engine, and for branching the driving force to both sides and transmitting it to the rotating cases 38 and 38. . The rotating case 38 receives this driving force and rotates around the rotating shaft 37 </ b> R of the planting transmission case 37. A plurality of gears (not shown) are meshed in the rotation case 38, and the driving force from the rotation shaft 37R of the planting transmission case 37 is transmitted to the seedling planting device 32 through these gears. A gear is fixed to one end of the rotary shaft 37R (in the rotary case 38), and this gear meshes with two other gears provided on both sides. These gears mesh with a gear fixed to the tip of the rotating shaft 32R of the seedling planting device 32 via another gear. The rotation case 38 rotates in synchronization with the rotation of the rotation shaft 37R, the respective gears in the rotation case rotate, and the rotation shaft 32R of the seedling planting device 32 rotates. The rotating shaft 37R is attached to the center of the rotating case 38 and includes seedling planting devices 32 at both ends of the rotating case 38, respectively. Accordingly, the two seedling planting devices 32 and 32 are provided at symmetrical positions around the rotation shaft 37R (that is, the two seedling planting devices 32 and 32 are arranged with respect to the rotation center of the rotation shaft 37R. It is in a position rotated 180 degrees).

As shown in FIG. 5, the seedling planting device 32 includes a planting device body (planting claw case) 321, a planting claw 322, a push rod 323, an extruded piece 324, and the like (the push rod 323 and the extrusion The seedling pusher is composed of the piece 324). The planting device main body 321 has a cast case shape and includes a cam 32K therein (the cam 32K rotates in the direction of the arrow in the drawing, that is, counterclockwise). The cam 32K is fixed to one end of the rotating shaft 32R. A gear is fixed to the rotation shaft 32R, and is linked to a gear fixed to the rotation shaft 37R via another gear. The rotation shaft 32R is configured to rotate once when the rotation shaft 37R rotates once. The cam 32K is in contact with the tip of the operating piece 32O. The distal end portion is provided with a rotating shaft 32O1, and the operating piece 32O is rotatably supported by the rotating shaft 32O1. The rotation shaft 32O1 is fixed to the planting device main body 321. Therefore, the operating piece 32O is rotatably supported around the rotation shaft 32O1 (the rotation center of the operation piece 32O is the center of the rotation shaft 32O1).

  A coil spring SP is brought into contact with the central portion of the operating piece 32O (the lower end of the coil spring SP is fitted into a columnar protrusion 32P provided on the operating piece 32O). Further, the upper end portion of the link member L is rotatably attached to the other end of the operating piece 32O via an attachment turning shaft 32O2. The upper end portion of the push rod 323 is rotatably attached to the lower end portion of the link member L via another attachment rotation axis AX. The push rod 323 is an iron round bar, and its lower end is formed in a substantially triangular shape when viewed in cross section. A push piece 324 is fixed to the lower end of the push rod 323. As will be described later, the tip of the extruded piece 324 is in contact with the back surface of the planting claw 322. Reference numeral 32C denotes an elastic member for elastically receiving the operating piece 32O when it is pushed out by the coil spring SP. The elastic member 32C is placed and fixed on a bracket 321B formed in the planting apparatus main body 321.

  The central portion of the push rod 323 is slidably supported by the support portion SU. The support unit SU is fixed by being fitted into the planting device main body 321. Accordingly, when the cam 32K rotates counterclockwise, the outer diameter r of the cam 32K gradually increases, and accordingly, the outer peripheral surface 32KS of the cam 32K gradually moves from the tip 32OT of the operating piece 32O to the side portion 32OS. And the contact point moves. Thereby, the operating piece 32O rotates clockwise in the figure with the rotation shaft 32O1 as a fulcrum. At this time, since the coil spring SP is in contact with the operating piece 32O from above, the operating piece 32O rotates upward (clockwise in the drawing) against the urging force of the coil spring SP.

Then, the outer diameter r of the cam 32K becomes the maximum at the top portion 32KT, and immediately after that, when reaching the step 32KG, the cam 32K is rotated downward (counterclockwise in the figure) by the urging force of the coil spring SP to operate. The tip 32OT of the piece 32O comes into contact with the outer peripheral surface 32KS of the cam 32K. Thus, the push rod 323 moves up and down via the link member L when the tip of the operating piece 32O moves up and down.

  The planting claw 322 is formed in a vertically long iron plate shape, and both sides thereof are bent (that is, formed in a U shape in a cross-sectional view). The tip portion is provided with a holding portion 322AV (shown in FIG. 6) as a space that can be divided into two to hold a seedling. Two through holes are provided in the front portion 322A of the planting claw 322, and are screwed to the planting apparatus main body 321 with a bolt BT.

  An extruding piece 324 is slidably in contact with the back side of the planting claw 322. As shown in FIG. 6, the extruded piece 324 is formed by bending an iron (forged) plate piece into a substantially U-shape. In other words, the extruded piece 324 includes two flat side portions 324A and 324A and a flat intermediate portion 324B disposed therebetween. A notch 324L1 is formed below the intermediate portion 324B, and another notch 324L2 is formed on both side portions 324A and 324A. The notch 324L1 is formed by horizontally cutting a position that is raised by a height H3 from the bottom surface of the intermediate portion 324B.

  Further, the notch 324L2 is cut in an arc shape by a length L1 from the contact point between the side portion 324A and the intermediate portion 324B (the notch 324L2 is not limited to the arc shape and is not soiled at the time of planting). Any shape can be used as long as the resistance from is reduced, for example, it may be triangular. The notches 324L1 and 324L2 may be formed by being cut at the same time. As a result, meat stealing is formed on the push rod 323 side under the extruded piece 324. Then, the outer surface 324BO of the intermediate portion 324B is fixed to the flat surface 323C of the push rod 323 by welding or the like so that the lower end 323E of the push rod 323 and the upper end 324U of the notch 324L1 coincide.

In addition, the lower side surface of the push rod 323 is cut off from three sides so that the cross section becomes a substantially triangular shape to form three flat surfaces 323A, 323B, and 323C (the lower portion of the push rod 323 has a horizontal cross section. The shape is not limited to a triangular shape, and any shape can be used as long as the cross-sectional area is smaller than the cross-sectional area of the upper part and the central part of the push rod 323 and the resistance from soil during planting decreases. May be). The height H1 of these flat surfaces 323A to 323C is equal to or greater than the height H2 of the extruded piece 324. This is to be fixedly provided in such reliably welding the intermediate portion 324B and the push rod 32 third pushing piece 324.

  The tips 324AT and 324AT of the side portions 324A and 324A of the extruded piece 324 are provided so as to be in contact with the back surface 322AB of the front portion 322A of the planting claw 322 and slidable up and down.

  The operation of planting rice in a paddy field using the seedling planting device 32 configured as described above will be described with reference to FIGS. In addition, the dashed-dotted line in a figure shows the movement locus | trajectory of the front-end | tip of the planting nail | claw 322. FIG.

  First, the rotating case 38 is rotated by the driving force transmitted from the planting transmission case 37, and the seedling planting device 32 is also rotated by a predetermined amount in conjunction with this, so that the planting claw 322 is at the lower end of the seedling mount 31. Scrape off a predetermined amount of seedling PL placed in Then, in a state where the seedling PL is gripped by the holding part 322AV of the planting claw 322, the seedling planting device 32 further rotates, and the tip of the planting claw 322 is stuck in the soft soil SS of the paddy field (FIG. 7A Note that the symbol WS indicates water). Note that when the seedling PL is scraped off from the seedling mount 31, the push rod 323 is raised to the uppermost position by the rotation operation of the cam 32 </ b> K (the state where the top portion 32 </ b> KT and the operating piece 32 </ b> O are in contact).

  Then, at the same time as the operating piece 32O comes into contact with the step 32KG, the push rod 323 is pushed downward at a stretch by the urging force of the coil spring SP. At this time, the extruding piece 324 moves downward while extruding the seedling PL held between the planting claws 322, and pushes the root PR of the seedling PL into the soil SS (FIG. 7B). Then, the planting claw 322, the extruded piece 324, and the push rod 323 come out of the soil SS by the combined operation of the rotation of the seedling planting device 32 and the rotating case 38 (FIGS. 7C and 7D).

Since the notches 324L1 and 324L2 are formed in the extruded piece 324, the frictional resistance with the soil SS can be reduced with respect to the direction in which the extruded piece 324 comes out, and the amount of kicking up of the soil SS accompanying the coming out Can be reduced. In addition, conventionally, when the seedling PL is planted in the soil SS, the extruded piece 324 enters the soil SS, so that the soil SS in the vicinity of the seedling PL has been formed. The seedling PL becomes unstable. The extruding piece 324 of this example can reduce the volume of the extruding piece 324 entering the soil SS when the seedling PL is planted in the soil SS by forming the notches 324L1 and 324L2. Thereby, it contributes to making the hollow formed around the planted seedling PL small. Accordingly, it is Rukoto to stabilize the seedlings PL was planted. The notches 324L1 and 324L2 also contribute to reducing the length of the extruded piece 324 that enters the soil SS. Therefore, the side area of the portion where the extruded piece 324 is in contact with the soil SS can be reduced, which contributes to further reducing the frictional resistance with the soil SS.

  Moreover, since the front-end | tip part of the push rod 323 is scraped off in the triangle shape in cross sectional view, the side area of the push rod 323 can be reduced and the frictional resistance between soil SS can be reduced. Therefore, the push rod 323 can reduce the amount of soil SS. Furthermore, since the lower end 323E of the push rod 323 is provided above the lower end of the extruded piece 324, the length of the push rod 323 that enters the soil SS can be shortened. Thereby, the side area of the part where the push rod 323 contacts the soil SS can be reduced, which contributes to further reducing the frictional resistance with the soil SS. In addition, the depression formed by the push rod 323 in the soil SS can be reduced.

  By the way, you may comprise the seedling planting apparatus of this invention as shown in FIG. That is, the seedling planting device 32 ′ is provided with a cam 32K ′ (note that other configurations are the same as those in the previous example, and thus the description thereof is omitted). The cam 32K ′ is provided with a first top portion 32K′T1 and a second top portion 32K′T2 along the outer periphery thereof. The first top portion 32K′T1 is a convex portion formed at a position of a radius r1 from the rotation center 32RC. On the other hand, the second top portion 32K′T2 is a convex portion formed at a position of a radius r2 (r2 <r1) from the rotation center 32RC.

  A first bottom 32K′B1 is provided at a position slightly advanced in the rotational direction (of the cam 32K ′) from the first top 32K′T1. The first bottom portion 32K′B1 is formed at a position having a radius r3 from the rotation center 32RC. A gap (r1-r3) is formed between the first top 32K′T1 and the first bottom 32K′B1 (referred to as a first step). On the other hand, a second bottom portion 32K′B2 is provided at a position slightly advanced in the rotation direction of the cam 32K ′ of the second top portion 32K′T1. The second bottom portion 32K′B2 is formed at a position having a radius r4 from the rotation center 32RC. A drop (r2-r4) is formed between the second top portion 32K′T2 and the second bottom portion 32K′B2 (referred to as a second step). With respect to the positional relationship between the first step and the second step, the second step is provided at a position that is advanced from the first drop by an angle α in the rotation direction of the cam 32K ′. Note that the angle α is slightly smaller than 180 degrees, for example, about 160 degrees (the first step and the second step are provided at substantially symmetrical positions with respect to the rotation center 32RC of the cam 32K ′). Moreover, the drop (r1-r3) of the first step is larger than the drop (r2-r4) of the second step.

  In this way, the first step and the second step are formed in the cam 32K ′, and the first step is formed by inserting the push piece 324 into the tip of the planting claw 322 when the push rod 323 plants the seedling PL on the soil SS. (The operation of the push rod 323 is called a main push). The second step is applied to the operation of removing the soil adhered between the planting claws 322 and the extruded piece 324 when the push rod 323 is raised after the seedling PL is planted in the soil SS. There is (the operation of the push rod 323 by this is called a sub push). By adding a sub-push to the planting operation, in particular, the soil SS (at the time of planting) attached to the planting claws 322 can be removed, and then when the seedling PL is scraped off from the seedling mount 31 The seedling PL can be appropriately held between the planting claws 322.

FIG. 9 shows the relationship between the cam 32K ′ and the rotating case 38 ′ in this example. Five gears G11, G21, G3, G22, and G12 are arranged in a row in the rotation case 38 ′. The gear G3 is fixed to the rotating shaft 37R, and rotates in synchronization with the rotation of the rotating shaft 37R (the rotating case 38 ′ also rotates in accordance with the rotation of the rotating shaft 37R. That is, the gear G3 is rotated. It is not rotating with respect to ´). As a result, the gears G11, G21, G3, G22, and G12 rotate within the rotation case 38 ′. Specifically, when the gear G3 rotates counterclockwise, the gears G21 and G22 meshing with the gear G3 rotate clockwise. Then, the gear G11, G 12 meshing respectively with the gear G21, G22 are both rotated counterclockwise. At the center of the gear G11, G 12, respectively fixed rotational axis 32R. A cam 32K ′ is also fixed on each of the rotating shafts 32R and 32R. Thus, the cam 32K' synchronized respectively with the rotation of the gear G11, G 12, 32K' also rotates counterclockwise.

  The cams 32K ′ and 32K ′ are fixed to the rotary shafts 32R and 32R so as to have the same phase with respect to the gear G3.

Next, the operation between the cam 32K ′ and the operating piece 32O will be described. In practice, the rotary case 38 'rotates with the rotary shaft 37R, but here, the description will be made with the rotary case 38' relatively fixed. When the cam 32K ′ rotates due to the rotation of the rotation shaft 37R, the first top portion 32K′T1 of the upper cam 32K ′ approaches the operating piece 32O. Accordingly, the radius of the cam 32K ′ increases toward r1. On the other hand, the lower side of the cam 32K', the second apex portion 32K'T2 approaching the operating piece 32O. As a result, the radius of the cam 32K ′ increases toward r2.

Then, in the operating piece 32O that comes into contact with the upper cam 32K ′, when the first top portion 32K′T1, the first step, and the first bottom portion 32K′B1 of the cam 32K ′ sequentially pass, the operating piece 32O (see FIG. 8). ) Turn counterclockwise to push the push rod 323 out of the seedling planting device 32 '(main push). Meanwhile, shortly after the first apex 32K'T1 of the upper cam 32K' passes operating piece 32O (i.e., after the radius of the cam 32K' is increased toward the r1) to the lower side of the cam 32K' In the abutting operation piece 32O, the second top portion 32K′T2, the second step, and the second bottom portion 32K′B2 pass in order.

  FIG. 9B shows the radii of the cams 32K ′ at which the cams 32K ′ and cams 32K ′ are in contact with the operating piece 32O, respectively (the curve A of the two curves in FIG. The cam 32K ′ and the curve B show the transition of the radius at the position where the cam 32K ′ of the lower side comes into contact with the operating piece 32O). It can be seen that the curve A and the curve B are out of phase so as to cancel each peak. The phase shift amount d is (180−α) (α indicates the angle formed between the first step and the second step as described above). In this way, α (<180) is appropriately set and the phases of the two curves A and B are shifted, so that the negative torque caused by the rotation of the two cams 32K ′ and the cam 32K ′ is applied to the rotating case 38 ′. The rotating case 38 ′ can be stably rotated by canceling out the applied strain (for a mechanism for applying a negative torque to the rotating case 38 ′, see, for example, JP-A-6-133614). A period between the time T1 and the time T3 is a cycle of one rotation of the cam 32K ′ indicated by the curve A.

  In the above example, the example in which the seedling planting device 32 is applied to a riding rice transplanter has been described. However, the present invention is not limited to this example, and is described in, for example, JP-A-11-155318. You may apply to such a walk type rice transplanter.

  In the above example, the seedling planting device 32 applied to the rotary type has been described. However, the present invention is not limited to this, for example, a crank type as described in JP-A-2003-339216. You may apply to. When applied to the crank type, the rotary case 38 (or 38 ') and the five gears housed therein are unnecessary, and the rice transplanter can be configured with a simple configuration. In addition, by combining the crank-type technology with a walking type rice transplanter, a walking type rice transplanter having a small and simple configuration suitable for work in a small paddy field can be obtained.

  The seedling planting apparatus of the present invention can be applied to a work of planting all kinds of seedlings in soft soil in addition to a rice transplanter.

32 seedling planting device 32C elastic member 32K, 32K 'cam 32K'B1 first bottom 32K'B2 second bottom 32KG step 32KS outer peripheral surface 32K'T1 first top 32K'T2 second top 32R rotation shaft 32RC rotation center 32O operation Piece 32O1 Rotating shaft 32O2, AX Mounting rotating shaft 32OS Side portion 32OT Tip 321 Planting device main body 321B Bracket 322 Planting claw 322A Front portion 322AV Holding portion 322AB Back surface 323 Push rod 323A, 323B, 323C Flat bottom surface 323E Flat surface 323E Piece 324U Upper end 324A Side portion 324AT Tip end 324B Intermediate portion 324BO Outer side surface 324L1, L2 Notch 37R Rotating shaft 38, 38 'Rotating case BT Bolt G11, G12, G21, G22, G3 Gear L Link member PL Seedling P R Root SP Coil spring SS Soil SU Support part WS Water

Claims (6)

A planting claw, a seedling pushing tool for pushing out the seedling sandwiched between the planting claws, and a planting claw case for holding the planting claw and the seedling pushing tool, and scraping a predetermined amount of seedling from the seedling stand A seedling planting device that can be taken and planted in the soil,
The seedling pusher is configured by joining an extruded piece that pushes the seedling in contact with the sandwiched seedling and a push rod that slides the extruded piece along the planting claw,
The extruded pieces formed so that the plate-shaped member cross-section view in a U shape, and two sides, I near between the two sides, is provided notches at the lower end The middle part and
The tip of the side portion is slidably brought into contact with the back surface of the planting claw, and the lower end of the push rod is fixed to the outer surface of the intermediate portion so as to coincide with the lower end of the intermediate portion. ,
To the side, the middle portion notch and continuously for providing a different notches, characterized Rukoto formed in an arc shape notch said another overhangs downwardly, seedling planting apparatus. The seedling planting apparatus according to claim 1, wherein a cross-sectional area of a lower portion of the push rod is made smaller than an upper portion and a central portion of the push rod . While scraping off the lower part of the push rod so that its cross-sectional view is triangular, the cross-sectional area of the lower part of the push rod is reduced,
The seedling planting apparatus according to claim 2 , wherein an intermediate part of the extruded piece is fixed to one side of a triangular shape below the push rod. One end of an operating piece is rotatably attached to the upper end of the push rod, a cam is brought into contact with the other end, which is the rotation center of the operating piece, and the operating piece moves up and down by the rotation of the cam. A seedling planting device that moves the rod up and down,
The seedling planting device according to any one of claims 1 to 3, wherein the cam has two steps along the outer periphery, and one step is larger than the other step. The seedling planting apparatus according to claim 4 , wherein the two steps are provided at positions substantially symmetrical with respect to the rotation center of the cam. The seedling planting apparatus according to any one of claims 1 to 3, wherein the seedling planting apparatus is provided in a crank-type rice transplanter.

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