JP4681418B2 - Planting mechanism of walking rice transplanter - Google Patents

Description

The present invention relates to a crank type planting mechanism mounted on a walking type rice transplanter.

The crank type planting mechanism has a crank arm connected to the outer end of the planting drive shaft supported by the planting drive case, and a swing arm pivotably coupled to the free end of the crank arm and the planting drive case. The tip of the planting claw attached to the planting arm is configured to circulate with a vertically long trajectory by the rotation of the crank arm. In this case, in the conventional planting mechanism, the planting arm is bent and formed in a crank shape, and the latter half part connected to the crank arm and the swing arm is closer to the planting drive case than the front half part to which the planting claws are attached. The torsional load acting on the crank arm is reduced by reducing the lateral displacement distance between the base end portion and the free end portion of the crank arm (see, for example, Patent Document 1).
JP 2003-70326 A

  As described above, it is possible to drive and rotate the crank arm comfortably by bending the planting arm into a crank shape, but the base end portion of the crank arm and the free end portion of the swinging arm are in the lateral direction. Because of the approach, in paddy fields with many stones, stones may be caught between the crank arm and the swing arm, and the planting mechanism may be locked and become inoperable. Was forced to interrupt.

  Since the planting arm is bent in a crank shape, the planting case located on the left side of the planting drive case, the planting case located on the right side, and the parts to be incorporated in it will be different from each other. The number of types increased and the cost increased.

  The present invention has been made paying attention to such points, and has as its main object to provide a crank type planting mechanism that can efficiently and continuously plant even in paddy fields with many stones. .

1st invention equips the rear part of the traveling body provided with a pair of right and left propulsion wheels with a seedling planting device and a steering handle, and the seedling planting device takes out the seedling from the lower end of the seedling stand in a backward tilted posture and enters the field. It has a planting mechanism for planting ,
The planting mechanism has a crank arm coupled to an outer end of a planting drive shaft supported by a planting drive case, and a swinging arm pivotally coupled to the free end of the crank arm and pivotably coupled to the planting drive case. The planting arm is connected to the same side surface in the left-right direction of the planting arm so as to be rotatable relative to the free end of the planting arm. Oite walking type rice transplanter planting mechanism are configured to circulate operate with elongated rotation locus,
The crank arm is connected to the other end side of the arm portion having an attachment portion to the planting drive shaft on one end side so as to be rotatable relative to the planting arm via a fulcrum shaft,
The swing arm is a bearing portion that pivotally supports a fulcrum shaft supported by the planting arm on the other end side of the arm portion provided with a bearing portion pivotally supported by a fulcrum shaft supported by the planting drive case on one end side. It is connected to the planting drive case and the planting arm so as to be relatively rotatable.
The fulcrum shaft on the planting drive case side that pivotally supports the swing arm is disposed below the planting drive shaft to which the crank arm is attached,
Wherein tare Rukoto spaced in the transverse direction between the bearing portion provided in the end of the planting arm side of the swing arm attachment portion provided in the end of the planting drive case side of the crank arm And

  According to the above configuration, even if the crank arm that continuously rotates in a fixed direction and the swing arm that reciprocally swings are in a phase approaching each other, the crank arm and the swing arm are spaced apart in the lateral direction. It becomes difficult for stones to get caught between the crank arm and the swing arm.

  Therefore, according to 1st invention, even if it is a paddy field with many stones, a work can be performed efficiently and continuously, without being interrupted by the pinching of stones.

According to a second invention, in the first invention,
The bearing boss portion of the planting drive case that pivotally supports the crank arm and the fulcrum boss portion of the planting drive case that pivotally supports the base end portion of the swing arm are arranged at substantially the same position in the lateral direction, and The planting arm is formed in a straight line toward the front-rear direction.

  According to the above configuration, the planting drive case is located at the center of the adjacent planting position, while the linear planting arm in the front-rear direction is at the planting position. The distance in the lateral direction is large, which is effective in securing a large lateral distance between the base end portion of the crank arm and the free end portion of the swing arm.

  Further, the linear planting arm extending in the front-rear direction and the components housed therein can be formed symmetrically, and can be shared by the planting mechanism on the left side and the planting mechanism on the right side of the planting drive case.

According to a third invention, in the first or second invention,
A seal ring having an inner peripheral lip and an outward lip is fitted and fixed to a bearing boss portion of the planting drive case that pivotally supports the crank arm, and the seal is attached to the planting drive shaft that is inserted through the bearing boss portion. A rotating member that covers the ring from the laterally outer side is mounted so as to be integrally rotatable, and the outward lip of the seal ring is configured to slide on the inner surface of the rotating member.

  According to the above configuration, the planting drive shaft can be sealed in the radial direction and the axial direction by the inner peripheral lip and the outward lip in the seal ring, and the infiltration of muddy water from the proximal end portion of the crank arm to the planting drive case, and Thus, leakage of lubricating oil in the planting drive case can be reliably prevented.

According to a fourth invention, in the third invention,
The rotating member is configured in an L-shaped ring shape having a cylindrical portion and an outer end flange portion that are externally fitted to the planting drive shaft, and an inner periphery of the seal ring is provided on an outer peripheral surface of the cylindrical portion. The lip is slidably contacted, and the outward lip of the seal ring is slidably contacted to the inner side surface of the outer end flange portion.

  According to the above configuration, since the seal in the radial direction and the axial direction is made on the series of rotating members, the sealing performance is better than the case where the seal in the radial direction and the axial direction is made on another part. Is expensive.

A fifth invention is the fourth invention, wherein:
A rubber layer is provided on the inner periphery of the cylindrical portion of the rotating member so as to be fitted on the planting drive shaft.

  According to the above configuration, the rubber layer is fixed to the planting drive shaft of the rotating member, and oiltight between the rotating member and the planting drive shaft, so that the rotating member can be easily attached. A reliable seal can be performed while being possible.

  FIG. 1 shows the entire side surface of the walking type rice transplanter, and FIG. 2 shows the entire plane. This walking type rice transplanter has a four-row planting seedling planting device 3 and a steering handle at the rear part of a traveling machine body 2 configured such that a pilot operator walks and follows from the rear part of the machine body while traveling with a pair of left and right propulsion wheels 1. 4 is provided, and a reserve seedling base 12 is provided in the front and rear intermediate portion of the traveling machine body 2.

  A hollow cylindrical main frame 5 also serving as a transmission case is provided in the center of the left and right of the traveling machine body 2 in the front-rear direction. A transmission case 6 is connected to the front end of the main frame 5. An engine 8 having a lateral axis is mounted and connected to the extended front frame 7. The output from the engine 8 is belt-transmitted to the transmission case 6 on the right side of the body, and the traveling system power changed by the transmission case 6 is branched and transmitted to the wheel cases 9 installed on the left and right of the transmission case 6. The wheel case 9 having the propulsion wheel 1 pivotally supported at the rear end portion is configured to be able to swing up and down around its base end, and relatively travels by adjusting the left and right wheel case 9 up and down. The machine body 2 can be lifted and lowered with respect to the cultivator on which the propulsion wheel 1 contacts the ground, and the swing angle of the left and right wheel cases 9 is varied to give a difference in the height of the left and right propulsion wheels 1. The traveling machine body 2 can be maintained in the horizontal horizontal position regardless of the difference in the horizontal height of the board.

  A center float 10 and a pair of left and right side floats 11 are provided at the lower part of the traveling machine body 2. The center float 10 is extended long over the front and rear of the propulsion wheel 1 to stably maintain the front-and-rear-facing posture of the traveling machine body 2 in a posture along the field surface, and leveling the planting locations of the central two strips. The side floats 11 are arranged on the left and right sides of the rear half of the machine body, stably maintain the seedling planting device 3 in the left-right direction along the rice field, and level the ground of the planting locations of the two outer strips.

  The seedling planting device 3 includes a seedling stand 15 in a tilted posture that is arranged so as to be able to move back and forth in a fixed stroke, four sets of crank-type planting mechanisms 16 that are arranged in front of the lower part of the seedling platform 15, Three deployed drive cases 17, 18, etc. are equipped.

  Of the three planting drive cases 17 and 18 arranged in parallel, the center planting drive case 17 is connected to the rear end portion of the main frame 5 and branched at the mission case 6 as shown in FIG. After the work system power is transmitted to the input shaft 21 of the planting drive case 17 through the transmission shaft 19 and the torque limiter 20 inserted into the main frame 5, the power of the planting drive case 17 is transmitted through the bevel gears 22 and 23 and the planting clutch 24. It is transmitted to the planting drive shaft 25 penetrating and horizontally installed in the lower part. As shown in FIGS. 5, 6, and 7, the power transmitted to the planting drive shaft 25 drives the central two-row planting mechanism 16, and the power of the planting drive shaft 25 is applied to the upper portion of the planting drive case 17. It is transmitted to a horizontal planting transmission shaft 26 and an intermediate transmission shaft 27 via a chain 28.

  The center planting drive case 17 and the left and right planting drive cases 18 are connected to each other by a cylindrical case 29 arranged concentrically with the planting transmission shaft 26, and the planting transmission shaft 26 of the center planting drive case 17. And the input shaft 30 with which the planting drive case 18 on either side was equipped is linked and connected by the transmission shaft 31 inserted in the cylinder case 29 concentrically. As shown in FIG. 8, in the left and right planting drive cases 18, the input shaft 30 and the planting drive shaft 25 mounted horizontally on the lower portion of the case are linked and connected via a chain 32, and each planting drive shaft 25 is connected to the outside 2. Each of the strip planting mechanisms 16 is driven.

  A horizontally long feed case 35 is connected to the upper end of the center planting drive case 17. The feed case 35 includes a screw shaft 37 having a reciprocating spiral groove 36, a feed member 38 that is externally fitted to the screw shaft 37 and screwed back and forth, and a lateral feed shaft 39 that penetrates left and right. The screw shaft 37 and the intermediate transmission shaft 27 are interlocked and connected via gears 40 and 41.

  The feed member 38 is supported by the transverse feed shaft 39 so as to be relatively rotatable only, and includes an engagement body 42 engaged with the reciprocating spiral groove 36 so as to be capable of rotating. The feed member 38 is rotated by a fixed rotation of the screw shaft 37. 38 is reciprocatingly screwed, the transverse feed shaft 39 is reciprocated in the axial direction, and the seedling bed 15 connected to both ends of the transverse feed shaft 39 as will be described later is reciprocated horizontally with a constant stroke. It has come to be.

  Cams 43 are fixed to both left and right ends of the screw shaft 37, and a pair of left and right passive levers 44 key-connected to the lateral feed shaft 39 are disposed with a feed member 38 interposed therebetween. When the stroke end is reached, one passive lever 44 enters the turning locus of one cam 43 and abuts, and the transverse feed shaft 39 is turned by a predetermined angle. The passive lever 44 is urged to rotate by a torsion spring 45, and the passive lever 44 released from contact with the cam 43 is returned and swung to the original standby posture.

  As shown in FIG. 1, a horizontal frame rod 46 made of an aluminum extrusion material is extended horizontally from the seedling table 15 to the back of the lower end of the seedling table 15 on which four seedlings are placed. At the same time, a horizontal frame rod 47 made of an extruded aluminum material is also horizontally connected to the upper rear surface of the seedling platform 15 over the entire width of the seedling platform, and the strength of the resin-molded seedling platform 15 is the upper and lower horizontal frame cages. 46, 47.

  As shown in FIGS. 3 and 4, a slide rail 50 made of an extruded aluminum material is horizontally fixed near the base of the steering handle 4, and a horizontal frame rod 46 at the bottom of the seedling platform is attached to the slide rail 50. It is externally fitted obliquely from above through a sliding piece 51 made of metal, and the seedling bed 15 is guided and supported by the sliding rail 50 and moves laterally. A support frame 52 is horizontally mounted on the upper part of the steering handle 4, and guide rollers 53 mounted on the left and right sides of the support frame 52 are engaged from below into a horizontal frame rod 47 on the upper part of the seedling platform, so that the seedling that moves to the left and right is placed. The upper portion of the table 15 is guided and supported to maintain the rear tilt posture.

  A partition wall 15a is provided on the front surface of the seedling table 15 so as to partition the four seedling setting surfaces, and a connecting bracket 54 for lateral feed is connected to the upper surfaces of the partition walls 15a at both ends. The connection bracket 54 is formed by aluminum die-casting, and the lower extension portions 54b of the connection bracket 54 are bolted to the left and right ends of the horizontal frame rod 46 extending outward from the seedling stand 15 to the left and right. Yes. As shown in FIG. 11, in the connection between the connection bracket 54 and the partition wall 15a, the hook-shaped engagement protrusion 54a protruding from below the lower surface of the connection bracket 54 is positioned in the engagement recess 15b of the partition wall 15a. The connection structure which stops and fixes by one bolt fastening in the upper part is employ | adopted.

  The front end portion of the connecting bracket 54 is engaged and connected to the left and right end portions of the lateral feed shaft 39 so as to be able to rotate only relative to each other. The seedling table 15 connected to the shaft 39 via the connection bracket 54 is reciprocally moved laterally with a constant stroke.

  As shown in FIGS. 3 and 4, a pair of upper and lower seedling vertical feed shafts 55 and 56 are horizontally mounted under the back portion of the seedling bed 15, and the both seedling vertical feed shafts 55 and 56 are interlocked and connected by a chain 57. ing. Each seedling vertical feed shaft 55, 56 is equipped with four seedling vertical feed pawls 58 protruding from the seedling setting surface, and the seedling removal of the bottom row of the seedlings F is completed and the seedling is placed. When the table 15 reaches the end of the lateral feed stroke, the eight claw wheels 58 arranged in two vertical rows per line rotate synchronously to feed the seedling F vertically downward. A seedling feed arm 59 is attached to one end of the upper seedling vertical feed shaft 55, and the seedling feed arm 59 and the operation arm 60 connected and fixed to the lateral feed shaft 39 are pushed and pulled through the partition wall 15a. When the transverse feed shaft 39 is pivotally connected as described above in the transverse feed stroke via the rod 61, the seedling feed arm 59 is driven to swing in conjunction with this, and the upper and lower seedling vertical feed shafts 55, 56 are interlocked. Is rotated in the seedling feeding direction. A one-way clutch 62 that transmits only the rotation of the seedling feeding arm 60 in the seedling feeding direction is interposed between the seedling vertical feeding shaft 55 and the seedling feeding arm 59, and the seedling The feed arm 59 is biased to return by a return spring 63, and the seedling feed arm 59 reciprocally swings so that the seedling vertical feed shafts 55 and 56 are rotated by a predetermined angle in the seedling feed direction. ing.

  An aluminum die-cast seedling receiving member 65 is laid over the left and right connecting brackets 54 and bolted in two places on the left and right sides, and is a rectangular frame comprising a lateral feed shaft 39, left and right connecting brackets 54, and a horizontal frame rod 46. Increased body rigidity. This seedling receiving member 65 receives the leaves of the seedling F placed and accommodated on the seedling table 15 and prevents them from drooping forward, and prevents the drooped leaves from coming into contact with the planting mechanism 16 and being damaged. .

  A seedling stay 66 for preventing the placed seedling F from floating and deforming is provided on the seedling table 15. The seedling stays 66 are composed of cantilevered bars extending upward along the seedling setting surface, and two seedling stays 66 are provided for each line, and the lower ends of the seedling stays 66 have a common base end. It is connected to a support shaft 67. The left and right end portions of the base end support shaft 67 are engaged with the recesses 68 of the left and right connecting brackets 54 and fixed with bolts 69 to prevent the arm end 67a from being bent and extended from the base end support shaft 67. The connecting bracket 54 is inserted into the long hole 70. That is, the entire seedling stay 66 can be swung up and down within the range of the long hole 70 around the proximal end support shaft 67, and the seedling stay 66 is fixed at the lower position which is the working position during planting work. When the seedling is replenished, the seedling stay 66 is lifted upward and swings.

As shown in FIG. 13, the planting mechanism 16 includes a crank arm 71 coupled to a planting drive shaft 25, and a swing arm pivotally coupled to each planting drive case 17 (18) so as to swing about a fulcrum a. 72, a hollow planting arm 73 pivotally connected across the free end of the crank arm 71 and the free end of the swing arm 72, a planting claw 74 mounted on the planting arm 73, a seedling pusher 75, and the like. Then, the crank arm 71 rotates at a constant speed around the axis p of the planting drive shaft 25 in a constant direction, so that the planting arm 73 is driven to swing up and down, and the tip of the planting claw 74 is the seedling take-out portion at the bottom of the seedling table And a vertical rotation trajectory S that extends across the surface T and is configured to circulate.
In the crank arm 71, a fulcrum shaft 81 that supports the planting arm 73 is connected to the other end side of the arm portion provided with an attaching portion 71a to the outer end of the planting drive shaft 25 on one end side.
The oscillating arm 72 has a fulcrum supported by the planting arm 73 on the other end side of the arm portion provided with a bearing portion 72c pivotally supporting the fulcrum shaft 72a supported by the planting drive case 17 (18) on one end side. A bearing 72d that pivotally supports the shaft 72b is provided.
Further, the fulcrum shaft 72a on the planting drive case 17 (18) side that pivotally supports the swing arm 72 is a planting drive shaft to which the crank arm 71 is attached, as shown in FIGS. 25 on the lower side.

  As shown in FIG. 12, the seedling pushing tool 75 is provided at the outer end of the push rod 76 that is removably attached to the tip portion of the planting arm 73, and the arm inner end portion of the push rod 76 and the planting arm. An end portion of an operating lever 77 that is swingably mounted around a fulcrum b is connected to the inside of 73 through a link 78. The fulcrum b of the operating lever 77 is provided with a fulcrum shaft 79 which is inserted from one lateral side of the planting arm 73 and penetrates and supports the operating lever 77, and the fulcrum shaft 79 is disposed on the lateral one side of the planting arm 73. A plug 80 that prevents the plug from being pulled out is press fitted. The plug 80 is made of a material softer than the material of the aluminum die cast planting arm 73 and protrudes by an appropriate amount so that it can be removed during disassembly and maintenance.

  A fulcrum shaft 81 that pivotally connects the crank arm 71 and the planting arm 73 is integrated with the crank arm 71, and a cam lever 77 a facing a cam 82 fixed to the fulcrum shaft 81 is a pivot of the operating lever 77. It extends from the base. The actuating lever 77 is oscillated and biased in the direction in which the push rod 76 protrudes by an internal compression coil spring 83, and the cam lever 77 a is urged and pressed against the outer periphery of the cam 82 by this oscillating force.

  When the crank arm 71 rotates in a certain direction, the fulcrum shaft 79 and the cam 82 rotate relative to the planting arm 73 in the same direction as the crank arm rotation direction, and the cam lever 77a follows the cam 82, thereby operating the lever. 77 is reciprocally swung around the fulcrum b, whereby the push rod 76 is driven back and forth. When the planting claw 74 is on the descending path from the lower end of the seedling base to the surface T, the cam lever 77a is mounted on the large diameter portion of the cam 82, and the operating lever 77 is swung backward against the compression coil spring 83. The seedling pushing tool 75 is in the retracted position, but when the planting claw 74 reaches the surface T, the cam lever 77a falls into the stepped portion of the cam 82, and the operating lever 77 is swung by the compression coil spring 83 so that the seedling pushing tool 75 is rapidly moved. The seedling held by the planting claws 74 is pushed out into the field. When the planting claw 74 that has finished planting is headed toward the rising path, the cam lever 77a rides on the large diameter portion of the cam 82, and the operating lever 77 is swung backward against the compression coil spring 83, so that the planting claw 74 is turned into a seedling. The seedling pusher 75 returns to the original retracted position before reaching the bottom end of the rest. The actuating lever 77 rapidly swung by the compression coil spring 83 is received by a shock absorbing rubber 84 fitted in the case, and the impact at the stroke end when the seedling pusher 75 is rapidly projected is alleviated. It is like that.

Here, the planting arm 73 formed by aluminum die casting is linear in the front-rear direction, and the crank arm 71 and the swing arm 72 can be pivotally connected to either the left side or the right side of the planting arm 73. It is formed symmetrically and can be shared with the planting mechanism 16 on the left or right side of the planting drive case 17 (18). The bearing boss portion 17a (18a) of the planting drive shaft 25 in the planting drive case 17 (18) and the fulcrum boss portion 17b (18b) of the swing arm 72 are disposed at substantially the same position in the lateral direction, and are linear in the front-rear direction. The space between the planting arm 73 and the planting drive case 17 (18) is formed large. A lateral distance C between the base end portion of the crank arm 71 and the free end portion of the swing arm 72 , that is, the mounting portion 71a provided at the end portion of the crank arm 71 on the planting drive case 17 (18) side; Between the swing arm 72 and the bearing portion 72d provided at the end on the planting arm 73 side, the lateral distance C is set to 10 mm or more, and the swing arm 72 reciprocally swings with the crank arm 71 that rotates continuously in a certain direction. A stone is prevented from being caught between the swing arm 72 in advance.

  It should be noted that at the pivotal support connection portion between the planting arm 73 and the crank arm 71, the shaft support boss portion 73a of the planting arm 73 protrudes toward the planting drive cases 17 and 18, and the base end portion and the free end of the crank arm 71 are projected. The strength of the crank arm 72 against a torsional load is ensured by reducing the deviation in the lateral direction (axial direction) with respect to the portion.

  A seal ring 86 having an inner peripheral lip 86a and an outward lip 86b is fitted into and fixed to a bearing boss portion 17a (18a) of the planting drive case 17 (18) that pivotally supports the crank arm 71, and a bearing boss portion. A rotation member 87 slidably in contact with the seal ring 86 is fixed to the planting drive shaft 25 supported by the bearing 17a (18a). The rotating member 87 is configured in an L-shaped ring shape having a cylindrical portion 87a and an outer end flange portion 87b that are fitted on the planting drive shaft 25, and a seal ring is provided on the outer peripheral surface of the cylindrical portion 87a. The inner peripheral lip 86a of 86 is in sliding contact, and the outward lip 86b of the seal ring 86 is in sliding contact with the inner surface of the outer end flange portion 87b. A rubber layer 88 is baked and secured to the inner periphery of the cylindrical portion 87a of the rotation member 87, and the rotation member 87 is press-fitted and fitted to the planting drive shaft 25 via the rubber layer 88. 87 is externally fitted and fixed to the planting drive shaft 25 in an oil-tight state.

  [Other Examples]

Bearing boss portion 17a of the planting drive case 17, 18, 18a directly brought into sliding contact planting drive shaft 25 the inner fitting inner circumferential lip 86a of the mounted seal ring 86, and secured externally fitted to the planting drive shaft 25 It can also be implemented in a form in which the outward lip 86b of the seal ring 86 is brought into sliding contact with a washer-like rotating member (not shown).

Overall side view of walking rice transplanter Overall plan view of walking rice transplanter Side view of main parts of seedling planting device Side view of main parts of seedling planting device Transverse plan view showing the seedling platform and the drive mechanism of the planting mechanism Transverse plan view showing the input section in the center planting drive case Vertical side view of center planting drive case Transverse plan view of the right planting drive case Front view of seedling platform Top view showing the lateral feed structure of the seedling platform Longitudinal side view showing the lower support structure of the seedling platform Longitudinal side view showing the main part of the planting mechanism Transverse plan view of planting mechanism Enlarged sectional view showing the shaft support on the planting drive shaft

17 planting case 17a bearing boss 17b fulcrum boss 18 bearing boss 18a bearing boss 18b fulcrum boss 25 planting drive shaft 71 crank arm 72 swing arm 73 planting arm 74 planting claw 86 seal ring 86a inner lip 86b outward Lip 87 Rotating member 87a Tube portion 87b Outer end flange portion 88 Rubber layer C Interval S Rotating locus

Claims (5)

A seedling planting device and a steering handle are mounted on the rear part of the traveling machine equipped with a pair of left and right propulsion wheels, and the seedling planting device has a planting mechanism for taking seedlings from the lower end of the seedling platform in a backward tilted posture and planting them on the field. ,
The planting mechanism has a crank arm coupled to an outer end of a planting drive shaft supported by a planting drive case, and a swinging arm pivotally coupled to the free end of the crank arm and pivotably coupled to the planting drive case. The planting arm is connected to the same side surface in the left-right direction of the planting arm so as to be rotatable relative to the free end of the planting arm. Oite walking type rice transplanter planting mechanism are configured to circulate operate with elongated rotation locus,
The crank arm is connected to the other end side of the arm portion having an attachment portion to the planting drive shaft on one end side so as to be rotatable relative to the planting arm via a fulcrum shaft,
The swing arm is a bearing portion that pivotally supports a fulcrum shaft supported by the planting arm on the other end side of the arm portion provided with a bearing portion pivotally supported by a fulcrum shaft supported by the planting drive case on one end side. It is connected to the planting drive case and the planting arm so as to be relatively rotatable.
The fulcrum shaft on the planting drive case side that pivotally supports the swing arm is disposed below the planting drive shaft to which the crank arm is attached,
Wherein tare Rukoto spaced in the transverse direction between the bearing portion provided in the end of the planting arm side of the swing arm attachment portion provided in the end of the planting drive case side of the crank arm The planting mechanism of the walking type rice transplanter. The bearing boss portion of the planting drive case that pivotally supports the crank arm and the fulcrum boss portion of the planting drive case that pivotally supports the base end portion of the swing arm are arranged at substantially the same position in the lateral direction, and The planting mechanism of the walking type rice transplanter according to claim 1, wherein the planting arm is formed in a straight line toward the front-rear direction. A seal ring having an inner peripheral lip and an outward lip is fitted and fixed to a bearing boss portion of the planting drive case that pivotally supports the crank arm, and the seal is attached to the planting drive shaft that is inserted through the bearing boss portion. 3. A rotating member that covers the ring from the laterally outer side is mounted so as to be integrally rotatable, and the outward lip of the seal ring is configured to slide on the inner surface of the rotating member. Planting mechanism of walking type rice transplanter. The rotating member is configured in an L-shaped ring shape having a cylindrical portion and an outer end flange portion that are externally fitted to the planting drive shaft, and an inner periphery of the seal ring is provided on an outer peripheral surface of the cylindrical portion. The planting mechanism of the walk type rice transplanter according to claim 3, wherein the lip is slidably contacted, and the outward lip of the seal ring is slidably contacted to the inner surface of the outer flange portion. The planting mechanism of the walk type rice transplanter according to claim 4, wherein a rubber layer that is externally fitted to the planting drive shaft is provided on an inner periphery of the cylindrical portion of the rotating member.

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