JP2006223134A - Seedling mat supporting mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent displacement of seedling mats during a planting operation while allowing transportation of seedling mats by a seedling sending belt. <P>SOLUTION: The seedling mat supporting mechanism comprises a seedling mat retention member that has a rod-like member and is supported on a seedling table so that the rod-like member takes a retention state in which the rod-like member is driven into the seedling mats placed on the seedling table and retains the seedling mats and a release state in which the rod-like member is separated from the seedling mats. The seedling mat retention member takes a retention state during the suspension of the seedling sending belt, is transferred from a retention state to a release state before the drive of the seedling sending belt at the starting of the transportation of the seedling sending belt and the seedling mat retention member is transferred from a release state to a retention state after the suspension of the drive of the seedling sending belt at the suspension of the transportation of the seedling sending belt. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rice transplanter, and more particularly to a seedling mat support mechanism.

  A planting case and a seedling mount configured to be supported by the planting case so as to be capable of reciprocating in the vehicle width direction and configured to convey a seedling mat placed on the seedling mounting table by a seedling feeding belt downward. A table, a rotary case rotatably supported by the planting case, and a claw case supported by the rotary case, the planter having a planting claw, wherein the seedling platform is arranged in the vehicle width direction. The seedling mat is taken out from the seedling mat by the planting claws and planted continuously, and when the seedling platform reaches the moving end in the vehicle width direction, the seedling mat is moved by a predetermined pitch by the seedling feeding belt. Various rice transplanters configured to convey downward have been proposed in the past (see, for example, Patent Document 1).

  By the way, the conventional rice transplanter includes a seedling mat pressing member that is always urged in the direction of the placement surface of the seedling stage in order to prevent a misalignment of the seedling mat placed on the seedling stage. However, there were problems in the following points.

That is, in such a rice transplanter, as described above, the seedling mat placed on the seedling stage is conveyed downward by the seedling feeding belt when the seedling stage reaches the moving end in the vehicle width direction. The
Therefore, the seedling mat pressing member must have an urging force that allows the seedling mat to be conveyed downward by the seedling feeding belt, and as a result, the seedling mat is vibrated by vibration during the running of the rice transplanter. There was a risk that the seedlings would fall and cause variations in the number of seedlings.

More specifically, in the rice transplanter, the lower end portion of the seedling mat is sequentially scraped along the vehicle width direction by the planting claws.
Therefore, when planting seedlings with the planting claws while moving the seedling mount from the moving end on one side in the vehicle width direction to the moving end on the other side in the vehicle width direction, In the latter part, a space is formed between the lower end of the seedling mat and the lower end of the seedling mount, and the seedling mat is likely to slip off.
JP 2004-194575 A

  The present invention has been made in view of the prior art, and when the seedling stage reaches the moving end in the vehicle width direction, the seedling mat placed on the seedling stage is conveyed downward by a predetermined pitch by the seedling feeding belt. A seedling mat support mechanism applied to a rice transplanter configured to be capable of effectively preventing misalignment of the seedling mat during the planting operation while allowing the seedling mat to be conveyed by the seedling feeding belt. An object is to provide a seedling mat support mechanism.

In order to achieve the above object, the present invention provides a planting case, a seedling mat supported by the planting case so as to be reciprocable in the vehicle width direction, and placed on the seedling stand by a seedling feeding belt. A seedling stand configured to be transported downward, a rotary case rotatably supported by the planting case, and a nail case supported by the rotary case, the planting claw having a planting claw And, while reciprocating the seedling stage in the vehicle width direction, taking out seedlings from the seedling mat by the planting claws and planting them continuously, and when the seedling stage reaches the moving end in the vehicle width direction A seedling mat support mechanism applied to a rice transplanter configured to convey the seedling mat downward by a predetermined pitch by the seedling feeding belt.
The seedling mat support mechanism according to the present invention is a seedling mat holding member having a bar-like member, and the holding state in which the bar-like member enters the seedling mat placed on the seedling stage and holds the seedling mat. And a seedling mat holding member supported by the seedling mount so that the bar-shaped member can be in a released state separated from the seedling mat.
The seedling mat holding member takes a holding state when the seedling feeding belt is stopped, shifts from a holding state to a released state before the seedling feeding belt is driven when the seedling feeding belt starts to be transported, and the seedling When the feeding belt is stopped, the driving of the seedling feeding belt is stopped, and then the state is changed from the released state to the holding state.

  Preferably, the seedling mat holding member has a plurality of the bar-shaped members along the vehicle width direction of the seedling mounting table, and the plurality of bar-shaped members are pitched in the vicinity of both ends of the seedling mounting table in the vehicle width direction. The intervals are narrow.

  The rice transplanter is a transverse feed shaft that is operatively connected to a drive source, and is operatively connected to the transverse feed shaft that pushes the seedling platform in the vehicle width direction by rotation around an axis, and the transverse feed shaft. A longitudinal feed shaft, a push cam provided on the longitudinal feed shaft so as not to rotate relative to the longitudinal feed shaft, a belt drive shaft supported on the seedling stage so as to be rotatable about an axis so as to drive the seedling feed belt, A belt driven cam provided on the belt drive shaft via a one-way clutch, and when the seedling stage reaches the moving end in the vehicle width direction, the belt drive shaft is engaged with the push cam, and the belt drive shaft is In the aspect provided with the belt driven cam that rotates to the one side around the axis by an angle, the seedling mat support mechanism biases the seedling mat holding member directly or indirectly toward the holding state. And seedlings supported so as to be rotatable about the axis. A holding member drive shaft and a holding member driven cam that is provided on the seedling mat holding member drive shaft so as not to rotate relative to the seedling mat holding member drive shaft, and engages with the push cam when the seedling stage reaches the moving end in the vehicle width direction. And a link member for operatively connecting the seedling mat holding member driving shaft and the seedling mat holding member, wherein the seedling mat holding member driving shaft rotates to one side around the axis. And a link member that shifts the seedling mat holding member from the holding state to the released state by rotating the mat holding member drive shaft around one axis.

  In the one aspect, preferably, the seedling mat holding member drive shaft may be arranged coaxially with the belt drive shaft.

  Preferably, the bar-shaped member may be positioned between a lower end portion of the seedling feeding belt and a seedling taking-out position by the planting claws with respect to a vertical position.

  For example, the seedling mat holding member is a swinging arm supported so as to be swingable about a pivot shaft, and a swinging arm having a base end connected to the link member, and a vehicle width of the seedling mounting base A support member connected to the tip of the swing arm so as to extend over the entire direction, and a support member that supports the rod-shaped member.

  According to the seedling mat support mechanism according to the present invention, it is possible to effectively prevent the misalignment of the seedling mat during the planting operation while allowing the seedling mat to be conveyed by the seedling feeding belt, and to make the number of planting uniform. it can.

Hereinafter, a preferred embodiment of a seedling mat support mechanism according to the present invention will be described with reference to the accompanying drawings.
1 and 2 show a side view and a plan view of a rice transplanter A to which the seedling mat support mechanism 100 according to the present embodiment is applied, respectively.

First, the whole structure of the rice transplanter A will be described.
The rice transplanter A includes a work vehicle main machine 1 and a planting device 15 attached to a rear portion of the work vehicle main machine.

  As shown in FIGS. 1 and 2, the work vehicle main machine 1 has a vehicle body frame 3, a drive source 2 placed on the front portion of the vehicle body frame 3, and a state in which the work vehicle is operatively connected to the drive source 2. A transmission case (not shown) disposed behind the drive source 2, a pair of front axle cases 5 disposed on both sides of the transmission case in the vehicle width direction, and the pair of front axle cases 5 A pair of paddy field traveling front wheels 6 supported respectively, a rear axle case 7 connected to the rear part of the transmission case via a connection frame 53, and a pair of paddy field traveling supported on both sides of the rear axle case 7 in the vehicle width direction. The rear wheel 8 is provided.

  Further, the work vehicle main unit 1 includes a bonnet 9 that covers the drive source 2, a vehicle body cover 11 that covers the transmission case, and a vehicle body frame 3 that is positioned above the vehicle body cover 11 via a seat frame 12. And a steering handle 14 disposed in front of the driver seat 13 and at the rear portion of the bonnet 9.

In addition, the codes | symbols 10 and 36 in FIG.1 and FIG.2 are the preliminary seedling mounting stand and fertilizer which are attached to the said working vehicle main body 1 so that attachment or detachment is possible according to a specification.
In the illustrated embodiment, the preliminary seedling stage 10 is provided on both sides of the bonnet 9 in the vehicle width direction.
The fertilizer application device 36 includes a fertilizer hopper 37 and a blower 38 that pumps the fertilizer in the fertilizer hopper 37.

3 and 4 show a front perspective view and a partial right side view of the planting device, respectively.
As shown in FIGS. 1 to 4, the planting device 15 includes a planting case 20 and a seedling mounted on the planting case 20 through a lower rail 18 and an upper rail 19 so as to be movable in the vehicle width direction. The base 16, the seedling feeding belt 92 mounted on the seedling mounting base so that the seedling mat placed on the seedling mounting base 16 can be conveyed downward, and the planting case 20 are rotatably supported. A rotary case 21 and a claw case 22 supported by the rotary case 21 and having a planting claw 17 are provided.

In the present embodiment, the planting device 15 is for eight strips in which eight single-row seedling mounts 16 on which one row of seedling mats can be placed are arranged in parallel in the vehicle width direction. .
The rotary case 21 is provided for each pair of adjacent seedling platforms 16, and a pair of the claw cases 22 are provided on both sides of each rotary case 21 in the vehicle width direction.
In other words, in the present embodiment, the planting device 15 has four rotary cases 21 for two strips and eight claw cases 22.

FIG. 5 shows a rear view of the planting case.
As shown in FIGS. 3 to 5, the planting case 20 has a planting drive case 75 having a planting input shaft 75 operatively connected to a PTO shaft (not shown) provided in the work vehicle main machine 1. 61, a horizontal pipe case 63 connected to the planting drive case 61 so as to extend in the vehicle width direction, and a horizontal pipe case 63 operatively connected to the planting input shaft 75 is inserted in the horizontal pipe case 63. A pipe case 63, a vertical case 62 connected to the horizontal pipe case 63 so as to extend rearward from the horizontal pipe case 63, the vertical case 63 rotatably supporting the rotary case 21, and the horizontal pipe A pair of left and right side frames 65 erected on the case 63 and a rolling frame 66 extending in the vehicle width direction so as to connect the upper portions of the pair of left and right side frames 65 are provided.

  The vertical case 62 has a planting claw drive shaft extending in the vehicle front-rear direction and a planting claw drive shaft (not shown) operatively connected to the planting drive shaft 75 and a rotation extending in the vehicle width direction. A rotary shaft 83 operatively connected to the planting claw drive shaft is provided, and the rotary case 21 is rotatably supported by the rotary shaft 83.

As shown in FIGS. 1 and 3, the planting case 20 having such a configuration includes a hitch bracket 23 and an elevating link mechanism 26 including a top link 24 and a lower link 25 connected to the hitch bracket 23. The work vehicle is connected to the main machine 1 so as to be movable up and down.
The work vehicle main machine 1 is provided with a lifting cylinder 27 (see FIG. 1) connected to the lower link 25, and the planting case 20 is lifted and lowered by the lifting cylinder 27. ing.

Further, the planting case 20 is swingable in the vehicle width direction with respect to the work vehicle main unit 1, so that even if the work vehicle main unit 1 tilts in the left-right direction, the planting device 15 can be held in a horizontal state.
Specifically, as shown in FIGS. 3 and 5, the planting case 20 is a fulcrum member 69 connected to the planting drive case 61 and provided on the hitch bracket 23 along the vehicle front-rear direction. A pair of fulcrum members 69 supported so as to be swingable about the rolling fulcrum shaft 68 and a pair of lower end portions connected to the fulcrum member 69 and upper end portions connected to the rolling frame 66 via left and right fixing brackets 70. Left and right frames 71.

  A hydraulic rolling cylinder 73 is interposed between the hitch bracket 23 and one of the left and right fixed brackets 70. By controlling the hydraulic rolling cylinder 73 to move forward and backward, the planting device 15 is moved into the rolling state. It can be swung around the fulcrum shaft 68.

In the figure, reference numeral 64 denotes a side bumper that is foldably provided at the left and right outermost ends of the horizontal pipe case.
Reference numeral 72 in the figure denotes an oblique reinforcing member that connects the left and right fixing brackets 70 and the lower ends of the left and right side frames 65 respectively.
Furthermore, 33, 34, and 35 in the figure are a center two-level flat center float, left and right two-level flat side float, and left and right outermost one-level flat auxiliary float.

Here, a structure for reciprocating the seedling mounting table 16 in the vehicle width direction and a structure for driving the seedling feeding belt 92 will be described.
In FIG. 6, the expansion | deployment top view of the said planting drive case 61 is shown.

As shown in FIG. 6, the planting device 15 has a transverse feed shaft 87 and a longitudinal feed shaft 88 that are operatively connected to the planting input shaft 75.
The lateral feed shaft 87 and the longitudinal feed shaft 88 are supported by the planting drive case 61 so as to be rotatable about the axis line in a state where one end is operatively connected to the planting input shaft 75 along the vehicle width direction. The other end is supported by a bearing plate 89 fixed to the right side frame 65 so as to be rotatable about its axis.

  Specifically, as shown in FIG. 6, the planting drive case 61 includes a planting transmission shaft 77 operatively connected to the planting input shaft 75 and a transmission shaft operatively coupled to the planting transmission shaft 77. 97, a transmission shaft 96 disposed in parallel with the transmission shaft 97, and a transmission mechanism 94 that performs multi-stage transmission (four steps in the illustrated embodiment) between the transmission shaft 97 and the transmission shaft 96. Power transmitted in synchronization with the lateral feed shaft 87 and the longitudinal feed shaft 88 is transmitted from the transmission shaft 96.

The transverse feed shaft 87 has a screw portion 87a on the outer peripheral surface.
The screw portion 87a is screw-coupled with a slider 90 that is operatively connected to the seedling table 46. When the transverse feed shaft 87 rotates about its axis, the slider 90 moves along the vehicle width direction. Accordingly, the seedling stage 16 is moved along the vehicle width direction.

7 and 8 show a schematic perspective view and a schematic side view of the vicinity of the lower end portion of the seedling mounting table 16, respectively.
As shown in FIGS. 4 and 6-8, the vertical feed shaft 88 is provided with a pair of push cams 91, and the seedling feed belt 92 is operatively operated by each of the pair of push cams. It is designed to be driven.

That is, as shown in FIGS. 4, 7 and 8, a belt drive shaft 92a along the vehicle width direction is supported on the seedling stage 16 so as to be rotatable about its axis, and the seedling feeding belt 92 is The belt drive shaft 92a and a belt driven shaft (not shown) spaced upward from the belt drive shaft 92a are wound endlessly.
The belt drive shaft 92a is engaged with one and the other of the pair of push cams 91 when the seedling stage 16 reaches the moving end on one side and the other side in the vehicle width direction. In addition, a belt driven cam 93 is provided.

With this configuration, the belt drive shaft 92a does not rotate while the seedling stage 16 is moving in the vehicle width direction, but the push cam is moved when the seedling stage 16 reaches the moving end in the vehicle width direction. 91 and the belt driven cam 93 are engaged with each other, and the belt drive shaft 92a rotates around the axis, whereby the seedling mat placed on the seedling placing table 16 is moved by the seedling feeding belt 92. The sheet is conveyed downward by a predetermined pitch.
Note that a one-way clutch is interposed between the belt driven cam 93 and the belt drive shaft 92a, and when the engagement with the push cam 91 is released, the belt driven cam. The cam 93 is returned to the initial position by the return urging member.

Next, the seedling mat support mechanism 100 will be described.
The seedling mat support mechanism 100 holds the seedling mat so that it cannot move with respect to the seedling mount 16 when the seedling feeding belt 92 is stopped, and when the seedling feeding belt 92 starts to be transferred from the stopped state to the conveying state. After the seedling mat is made movable before the seedling feeding belt 92 is driven, and when the seedling feeding belt 92 is stopped from being transported to the stop state, the driving of the seedling feeding belt 92 is stopped. The seedling mat is configured so as to be immovable with respect to the seedling mounting table 16.

  Specifically, the seedling mat support mechanism 100 includes a seedling mat holding member 110 having a rod-shaped member 111, a seedling mat holding member drive shaft 120 supported on the seedling mounting table 16 so as to be rotatable about an axis, and the seedling. A holding member driven cam 130 provided on the mat holding member drive shaft 120 so as not to rotate relative to the mat holding member drive shaft 120, a link member 140 operatively connecting the seedling mat holding member drive shaft 120 and the seedling mat holding member 110, and the seedling mat holding And a biasing member 150 that biases the member 110 directly or indirectly toward the holding state.

The seedling mat holding member 110 includes a holding state in which the tip of the rod-shaped member 111 enters the seedling mat placed on the seedling mounting table 16 to hold the seedling mat, and the tip of the rod-shaped member 111. Is supported by the seedling stage 16 so as to be in a released state separated from the seedling mat.
In this embodiment, as shown in FIGS. 7 and 8, the seedling mat holding member 110 is swingable about a pivot shaft 115 supported by the seedling mount 16 along the vehicle width direction. A supported swing arm 112, a support member 113 connected to the tip of the swing arm 112 so as to extend over the entire region of the seedling platform 16 in the vehicle width direction, and extending downward from the support member 113. As described above, the rod-shaped member 111 supported by the support member 113 is provided.
The seed mat holding member 110 has a holding state in which the tip of the bar-shaped member 111 is stuck into the seedling mat in response to the swing of the swing arm 112 around the pivot shaft 115, and the tip of the bar-shaped member 111. The part is in a released state where it is separated from the seedling mat.

The seedling mat holding member drive shaft 120 rotates around the axis in response to the holding member driven cam 130 swinging around the axis.
In the present embodiment, as shown in FIGS. 7 and 8, the seedling mat holding member drive shaft 120 and the holding member driven cam 130 are integrally formed by a single member.
Of course, the seedling mat holding member drive shaft 120 and the holding member driven cam 130 may be formed by separate members.

The holding member driven cam 130 engages with the pushing cam 91 when the seedling stage 16 reaches the moving end in the vehicle width direction, and moves the seedling mat holding member drive shaft 120 to one side around the axis (in FIG. 8). Is rotated counterclockwise).
Specifically, the holding member driven cam 130 starts to be engaged with the pushing cam 91 before the belt driven cam 93 and is engaged with the pushing cam 91 after the belt driven cam 93. It is configured to cancel the connection.

The link member 140 shifts the seedling mat holding member 110 from the holding state to the released state by rotating the seedling mat holding member drive shaft 120 around one axis (counterclockwise direction in FIG. 8). It is configured.
In the present embodiment, the link member 140 includes a first link 141 whose base end is supported by the seedling mat holding member drive shaft 120 so as not to rotate relative to the seed mat holding member drive shaft 120, and a base end that is the tip of the first link 141. And a second link 142 having a distal end portion slidably connected to a proximal end portion of the oscillating arm 112.

The urging member 150 is configured so that the seedling mat holding member 110 is maintained in a holding state when the holding member driven cam 130 and the pushing cam 91 are not engaged. Is operatively energized.
In the present embodiment, as shown in FIGS. 7 and 8, the urging member 150 has one end connected to the seedling mount 16 and the other end connected to the link member 140.

Note that the penetration depth of the bar-shaped member 111 into the seedling mat when the seedling mat holding member 110 is in the holding state is set by a stop member 160 that defines the end of the pushing direction by the biasing member 150. Is done.
In the present embodiment, the urging member 150 urges the seedling mat holding member drive shaft 120 to the other side around the axis (clockwise direction in FIGS. 8 and 9), and the stop member 160 is , Engaging the holding member driven cam 130 to stop the rotation of the seed mat holding member drive shaft 120 around the axis to the other side, whereby the rod-shaped member 111 enters the seed mat in the holding state. It is configured to limit the depth.
When the seedling mat has a thickness of 25 to 30 mm, the penetration depth can be set to 15 mm, for example.

The seedling mat support mechanism 100 having such a configuration operates as follows.
That is, the holding member driven cam 130 is engaged with the push cam 91 while the seedling stage 16 is moved between the moving end on one side and the moving end on the other side in the vehicle width direction. do not do.
Therefore, the seedling mat holding member 110 is maintained in a holding state in which the bar-shaped member 111 is pierced into the seedling mat by the biasing force of the biasing member 150, thereby effectively preventing the misalignment of the seedling mat. (See FIG. 8).

On the other hand, when the seedling stage 16 reaches the moving end in the vehicle width direction, the pushing cam 91 resists the biasing force of the biasing member 150 and holds the seedling mat via the holding member driven cam 130. The member drive shaft 120 is rotated to one side around the axis, whereby the seedling mat holding member 110 is shifted from the holding state to the released state (see FIG. 9).
At this time, as described above, the holding member driven cam 130 starts to be engaged with the pressing cam 91 before the belt driven cam 93 and after the belt driven cam 93. It is comprised so that engagement with 91 may be cancelled | released.
Therefore, the seedling mat is transported reliably by the seedling feeding belt 92 at the moving end in the vehicle width direction of the seedling mount 16.

  In this way, the seedling mat support mechanism 100 according to the present embodiment is moving the seedling mounting table 16 while allowing the seedling feeding belt 92 to convey the seedling mat at the moving end of the seedling mounting table 16. The rod-shaped member 111 is configured to enter the seedling mat and hold the seedling mat. Therefore, the seedling mat presser always urges the seedling mat toward the placement surface of the seedling mounting base. Compared to the rice transplanter equipped with the members, the misalignment of the seedling mat can be effectively prevented, and thereby the variation in the number of seedlings can be suppressed.

In FIG. 10, the schematic diagram which shows the relative positional relationship of the seedling feed belt 92, the seedling mat 200, the planting nail | claw 17, and the rod-shaped member 111 is shown.
7 and 10, the single seedling feed belt 92 is illustrated as being provided on the seedling stage 16, but a plurality of seedling feeding belts 92 are provided in the width direction as shown in FIG. It is also possible and / or a plurality can be provided in the vertical direction.
In the present embodiment, the bar-shaped member 111 is disposed so as to pierce the seedling mat 200 in the lower region of the seedling mat 200, thereby effectively preventing the positional deviation of the entire seedling mat 200.
Specifically, the bar-shaped member 111 is positioned in a region S between the lower end portion of the seedling feeding belt 92 and the seedling removal position by the planting claws 17 with respect to the vertical position (see FIG. 10). .

Furthermore, in the present embodiment, as shown in FIG. 7, a plurality of the bar-shaped members 111 are provided along the vehicle width direction, and the pitch of the plurality of bar-shaped members 111 is set to It is narrow in the vicinity of both ends in the vehicle width direction, thereby preventing the positional deviation of the seedling mat 200 more effectively.
That is, as shown in FIG. 10, when the seedling mounting table 16 is moved to one side in the vehicle width direction (in the direction of the arrow) and seedlings are continuously taken out by the planting claws 17, In the portion after being scraped off by the claws 17, a gap P is formed between the lower end portion of the seedling mat 200 and the lower end portion of the seedling mounting table 16, and the seedling mat 200 is on one side in the vehicle width direction (FIG. 10). It is easy to slip down from the right side).
From this point of view, in the present embodiment, a plurality of the rod-shaped members 111 are provided along the vehicle width direction, and the pitch of the plurality of rod-shaped members 111 is narrow in the vicinity of both ends of the seedling mounting table 16 in the vehicle width direction. Thus, the misalignment of the seedling mat 200 is more effectively prevented.

Further, in the present embodiment, as shown in FIGS. 7 to 9, the seedling mat holding member drive shaft 120 is arranged coaxially with the belt drive shaft 92a, and the belt driven cam 93 and the holding member are arranged. The driven cam 130 is configured to swing around the same axis.
According to such a configuration, the engagement start timing of the holding member driven cam 130 and the push cam 91 is set to the engagement start timing of the belt driven cam 93 and the push cam 91 with a reliable and simple configuration. The disengagement timing of the holding member driven cam 130 and the push cam 91 can be made earlier than the disengagement timing of the belt driven cam 93 and the push cam 91.

FIG. 1 is a side view of a rice transplanter to which a seedling mat support mechanism according to the present invention is applied. FIG. 2 is a plan view of the rice transplanter shown in FIG. FIG. 3 is a perspective view of the planting apparatus in the rice transplanter shown in FIGS. 1 and 2 as viewed from the front. FIG. 4 is a partial right side view of the planting apparatus shown in FIG. 3. FIG. 5 is a rear view of the planting case in the planting apparatus shown in FIGS. 3 and 4. 6 is a developed plan view of a planting drive case in the planting case shown in FIG. FIG. 7 is a schematic perspective view in the vicinity of the lower end portion of the seedling platform in the rice transplanter, showing a state where an embodiment of the seedling mat support mechanism according to the present invention is mounted. FIG. 8 is a right side view in the vicinity of the lower end portion of the seedling mount shown in FIG. 7 and shows a seedling mat holding state of the seedling mat support mechanism. FIG. 9 is a right side view in the vicinity of the lower end portion of the seedling mount shown in FIG. 7 and shows a seedling mat released state of the seedling mat support mechanism. FIG. 10 is a schematic plan view in the vicinity of the lower end portion of the seedling stage shown in FIGS. 7 to 9 and shows the relative positional relationship among the seedling feeding belt, the seedling mat, the planting claw, and the rod-like member.

Explanation of symbols

A Rice transplanter 16 Seedling stand 17 Planting claw 20 Planting case 21 Rotary case 22 Claw case 87 Horizontal feed shaft 88 Vertical feed shaft 91 Pushing cam 92 Seedling feed belt 92a Belt drive shaft 93 Belt driven cam 100 Seedling mat support Mechanism 110 Seedling mat holding member 112 Swing arm 113 Support member 115 Pivoting shaft 111 Rod-shaped member 120 Seedling mat holding member drive shaft 130 Holding member driven cam 140 Link member 150 Energizing member 200 Seedling mat

Claims (6)

A planting case and a seedling mount configured to be supported by the planting case so as to be capable of reciprocating in the vehicle width direction and configured to convey a seedling mat placed on the seedling mounting table by a seedling feeding belt downward. A table, a rotary case rotatably supported by the planting case, and a claw case supported by the rotary case, the planter having a planting claw, wherein the seedling platform is arranged in the vehicle width direction. The seedling mat is taken out from the seedling mat by the planting claws and planted continuously, and when the seedling platform reaches the moving end in the vehicle width direction, the seedling mat is moved by a predetermined pitch by the seedling feeding belt. A seedling mat support mechanism applied to a rice transplanter configured to convey downward,
A seedling mat holding member having a bar-shaped member, wherein the bar-shaped member enters the seedling mat placed on the seedling mounting base and holds the seedling mat; and the bar-shaped member is separated from the seedling mat. A seedling mat holding member supported by the seedling stage so as to be separated and released,
The seedling mat holding member takes a holding state when the seedling feeding belt is stopped, shifts from a holding state to a released state before the seedling feeding belt is driven when the seedling feeding belt starts to be transported, and the seedling A seedling mat support mechanism configured to shift from a released state to a holding state after driving of the seedling feeding belt is stopped when conveyance of the feeding belt is stopped. The seedling mat holding member has a plurality of the rod-shaped members along the vehicle width direction of the seedling mount,
2. The seedling mat support mechanism according to claim 1, wherein the plurality of rod-shaped members have a narrow pitch interval in the vicinity of both ends in the vehicle width direction of the seedling mount. The rice transplanter is a transverse feed shaft that is operatively connected to a drive source, and is operatively connected to the transverse feed shaft that pushes the seedling platform in the vehicle width direction by rotation around an axis, and the transverse feed shaft. A longitudinal feed shaft, a push cam provided on the longitudinal feed shaft so as not to rotate relative to the longitudinal feed shaft, a belt drive shaft supported on the seedling stage so as to be rotatable about an axis so as to drive the seedling feed belt, A belt driven cam provided on the belt drive shaft via a one-way clutch, and when the seedling stage reaches the moving end in the vehicle width direction, the belt drive shaft is engaged with the push cam, and the belt drive shaft is A belt driven cam that rotates to one side around the axis by an angle,
The seedling mat support mechanism includes a biasing member that biases the seedling mat holding member directly or indirectly toward a holding state, a seedling mat holding member driving shaft that is rotatably supported about an axis, and the seedling mat. A holding member driven cam that is provided on the holding member drive shaft so as not to rotate relative to the holding member drive shaft, and engages with the push cam when the seedling platform reaches the moving end in the vehicle width direction, thereby driving the seedling mat holding member drive shaft. And a link member for operatively connecting the seedling mat holding member driving shaft and the seedling mat holding member, and one side around the axis of the seedling mat holding member driving shaft. The seedling mat support mechanism according to claim 1, further comprising: a link member that shifts the seedling mat holding member from a holding state to a released state by rotation of the seedling mat.   The seedling mat support mechanism according to claim 3, wherein the seedling mat holding member drive shaft is disposed coaxially with the belt drive shaft.   The seedling mat support according to claim 3 or 4, wherein the bar-like member is positioned between a lower end portion of the seedling feeding belt and a seedling taking-out position by the planting claws with respect to a vertical position. mechanism. The seedling mat holding member is a swinging arm supported so as to be swingable around a pivot shaft, and a swinging arm having a base end connected to the link member;
The support member is connected to the tip of the swing arm so as to extend over the entire vehicle width direction of the seedling stage, and includes a support member that supports the rod-shaped member. The seedling mat support mechanism according to any one of claims 3 to 5.

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