JPH104793A - Seedling root cutting machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To realize a root cutting machine that can mechanize the operation of placing seedlings on a rake plate in addition to root cutting. SOLUTION: There is provided a lifting device for lifting and turning one end of a mat seedling in a seedling raising box, and a cutting device for driving and cutting a root by pushing a cutting blade 6 between the mat seedling whose one end is raised and the seedling raising box. The cutting device is provided with a drive mechanism that pushes and moves the cutting blade 6 by forward and reverse rotation of the drum 12 around which the flexible cutting blade 6 is wound.
Is pushed and moved in a state of carrying the seedlings, thereby forming a seedling placing device C on which the mat seedlings are placed on the seedling rake plate H at the time of root cutting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a root cutting machine for mat-like seedlings grown in a nursery box, and more particularly, to placing seedlings in a nursery box so that the seedlings can be easily taken out of the nursery box. The present invention relates to a machine for cutting a root entangled with a surface.

[0002]

2. Description of the Related Art When a mat-shaped seedling is grown in a nursery box, the root of the seedling is entangled and adheres to a drainage hole formed in the bottom of the box. Since a considerable amount of labor is required, it cannot be sufficiently covered by manual work.
No. 6107 proposes a machine for driving and cutting roots of seedlings attached to a nursery box.

[0003]

The mat-shaped seedlings from which the roots have been cut are taken out of the seedling raising box and placed on a seedling scooping plate, for example, in order to carry the seedlings to a rice transplanter at the ridge for replenishment. Therefore, in the above-mentioned proposed technique, the operation of placing the root-cut mat-shaped seedlings from the nursery box on the seedling rake board still relies on human power. An object of the present invention is to realize a root cutting machine that can mechanize an operation of placing a seedling on a rake plate in addition to root cutting.

[0004]

[Means for Solving the Problems]

[Constitution] The first invention is a cutting method in which a cutting blade is pushed between a seedling box and a mat-shaped seedling grown by the cutting blade to drive and cut the root of the lower mat-shaped seedling from the seedling mounting surface of the seedling raising box. A root cutting machine is characterized by comprising a device and a seedling placing device capable of placing a mat-shaped seedling whose roots have been cut on a seedling rake plate.

[0005] A second invention is a lifting device for forcibly lifting one end of a mat-shaped seedling grown in a seedling box from the seedling box,
A cutting device that pushes a cutting blade between the upper and lower sides of the mat-shaped seedling whose one end is lifted and the seedling raising box to drive and cut the root of the lower mat-shaped seedling from the seedling mounting surface of the seedling raising box; A cutting blade and a drive mechanism capable of pushing and retracting the cutting blade, and a seedling placing device capable of placing a mat-shaped seedling with a cut root on a seedling rake plate. It is characterized by having.

A third invention is characterized in that the seedling placing device according to the first or second invention is configured such that the cutting device can push out and move a cutting blade in a state of carrying a seedling rake plate. I do.

According to a fourth aspect of the present invention, in the third aspect, the pushing movement force is transmitted to the seedling rake plate when the cutting blade is pushed and moved, and the drawing movement force is applied to the seedling rake plate when the cutting blade is pulled and moved. It is characterized in that the cutting blade is provided with a one-way transmission mechanism that functions to prevent transmission.

According to a fifth aspect of the present invention, the one-way transmission mechanism according to the fourth aspect of the present invention is configured such that a raised portion formed by partially cutting and raising a cutting blade so that a lower side in a pushing movement direction is raised upward can push a seedling rake plate back. The feature is that it is formed by forming.

In a sixth aspect of the present invention, in the third to fifth aspects, guide rollers urged in a direction for pressing the seedling rake plate downward are provided at both left and right ends of the cutting blade in the pushing movement path. The left and right ends of the stepped handle at the rear end of the rake plate are notched to allow passage of the guide rollers.

A seventh invention is the fifth or sixth invention, wherein:
A hole is formed on the bottom surface of the front of the seedling rake plate to receive the boosting driving force by the raised portion, and an escape groove is formed from the rear end of the seedling rake plate to prevent interference with the raised portion when the cutting blade is retracted. It is characterized in that it is formed over the entire area.

According to the structure of the first aspect, the mat-shaped seedlings whose roots have been cut by the cutting device and which are entangled in the nursery box are
Because the seedling mounting device puts it on the seedling rake board,
Both the operation of cutting the seedlings and transferring them to the seedling rake board can be mechanized.

According to the second aspect of the present invention, one end of the mat-shaped seedling in the seedling raising box is turned up by the lifting device, and the cutting blade is pushed into the turned up portion by the cutting device so that the root can be driven and cut. become. That is, claim 1
According to the configuration of the present invention, there is a limitation that a seedling box having a side wall at one longitudinal end missing is required as in the above-mentioned proposed technique, but in the present invention, the cutting blade can be inserted from above the side wall. Therefore, rooting can be performed using a conventional nursery box in which a rectangular seedling mounting surface is integrated with a total of four front, rear, left, and right side walls. Then, the mat-shaped seedlings whose roots have been cut by the cutting device
Because the seedling mounting device puts it on the seedling rake board,
It is possible to mechanize the operation of replacing the roots of the seedlings with the seedling rake plates while using a conventional seedling raising box.

According to the third aspect of the present invention, the seedling rake plate enters between the seedling and the seedling raising box together with the cutting blade, so that the root cutting is completed and the transfer of the seedling is completed at the same time. In addition, a dedicated drive source for replacing the seedling rake plate is not required. In other words, the efficiency of replacing the seedling from the root cutting to the seedling rake plate is excellent, and the structure can be simplified and the cost can be reduced by omitting the driving devices.
In addition, since the seedling rake plate and the cutting blade will rush in a state of being overlapped, the interaction between the seedling rake plate and the cutting blade will improve to improve the buckling strength of each other, resulting in more robustness. Or the thickness of the cutting blade can be made thinner or lighter.

According to the fourth aspect of the present invention, when the cutting blade is pushed and moved between the seedling and the seedling raising box by the function of the one-way transmission mechanism, the cutting blade is moved together with the seedling rake plate. However, the seedling rake plate does not move together and remains in the nursery box. Therefore, there is no structure for performing another operation of removing the seedling rake plate from the seedling raising box at the end of cutting, and there is no need to wait for the removal operation, but by simply pushing and pulling the cutting blade, the seedling rake plate is moved. Will be completed.

According to the fifth aspect, the one-way transmission mechanism can be simply and inexpensively configured. That is, when the cutting blade is cut and raised so as to protrude on the lower side in the pushing movement direction, for example, as shown in FIG. 11, the upper side in the pushing movement direction becomes an inclined surface. Therefore, when the cutting blade is pushed and moved, the ridge portion pushes the seedling rake plate, and when the cutting blade is pulled and moved, the ridge portion passes the seedling rake plate due to its inclination.

According to the configuration of claim 6, the following operation is provided. While the cutting blade carrying the seedling rake plate is pushed between the seedling and the seedling raising box, the seedling rake plate may come off the cutting blade due to mechanical vibration, etc., but the guide roller is urged downward to the pushing movement path. By arranging the seedlings, the seedling rake plate comes to be pressed against the cutting blade, so that the above-mentioned risk of detachment until the rush plate is inserted can be eliminated.

According to the seventh aspect of the present invention, since the cutting blade pushes the front portion of the seedling rake plate, the seedling rake plate buckles or rolls up as compared with a case where the seedling rake plate is pushed later. It is possible to stably rush between the seedlings and the nursery box without any. When the cutting blade is retracted, the raised portion passes through the escape groove of the seedling rake plate, so that the shock of climbing over the raised portion is reduced as compared with the case where there is no escape groove, and the raised portion and the seedling are rubbed by both. There is no need to worry about the wear on the bottom of the rake plate.

[Effect] With the root cutting machine according to any one of the first to seventh aspects, the root cutting operation of the seedlings in the seedling raising box and the operation of replacing the rooted cut mat-shaped seedlings with the rake plate can be automated. , So that they can work more conveniently and efficiently.

The root cutting machine according to the second aspect has the advantage that the above-mentioned effects can be obtained while keeping the seedling box economically usable by raising the seedling end and pushing the cutting blade. .

In the root cutting machine according to the third aspect, most of the seedling placing device is constituted by the cutting device, so that the operation from root cutting to seedling replacement can be made more efficient and at a low cost. It was made reasonable and configurable.

In the root cutting machine according to the fourth aspect, the cutting apparatus constitutes a seedling placing apparatus, and the operation from root cutting to seedling replacement is made more efficient than that according to the third aspect. It was made reasonable and could be constructed inexpensively.

According to the fifth aspect of the present invention, there is an advantage that the one-way transmission mechanism can be simply and inexpensively configured, and the cost of the entire machine can be reduced.

In the root cutting machine according to the sixth aspect, the cutting blade and the seedling rake plate can be reliably moved integrally with each other, so that the reliability of the transfer operation of the seedlings is improved.

In the root cutting machine according to the seventh aspect, there is an advantage that the reliable integrated movement of the cutting blade and the seedling rake plate is more stably exhibited.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 and FIG. 8 show a seedling root cutting machine provided with a placement part A for placing the seedling raising box 1 and a cutting part B for cutting the roots of the mat-like seedlings in the seedling raising box 1. Have been. The mounting portion A is configured by laying a mounting frame 4 over the main body frame 2 and the legs 3, and the nursery box 1 having a mat-shaped seedling W grown to some extent is mounted thereon.

First, an outline of the operation of this root cutting machine will be described. First, as shown in FIG. 1, a seedling raising box 1 loaded with mat seedlings is placed on a mounting portion A, and then the switch is turned on. To activate the cutting section B. Then, the drum 12 rotates in the direction of arrow A, and the cutting blade 6 wound therearound starts to move forward with the seedling rake plate H, and the first cam 16 rotates to move the operated lever 18. As shown in FIG. 2, the hook-shaped member 13 is swung downward and thrust into the rear end of the mat-shaped seedling W (hooking mechanism a). At this time, the lifting prevention mechanism d functions to maintain the shape of the quadruple link mechanism c in the side view at that time, and the pivot 19 to which the operated lever 18 is attached does not escape upward, and the hook The member 13 protrudes into the seedling.

Then, as shown in FIG.
7 kicks down the upper arm 22 and moves the quadruple link mechanism c in a direction in which the vertical length thereof is compressed, so that the hook-like member 13 is lifted up to forcibly lift and raise the seedling end. (Elevating mechanism b and lifting assist mechanism h). In the rolled-up state, the cutting blade 6 with the rake plate H enters between the mat-shaped seedling W and the seedling mounting surface 1a (see FIG. 4), and the rotation of the drum 12 continues by the rotation. The cutting blade 6 advances while cutting the root to the front end of the seedling raising box 1 (see FIG. 5).

The cutting blade 6 advances to the front end of the nursery box 1 (FIG. 9).
Then, the drum 12 is rotated in the reverse direction of the arrow B to take up and move the cutting blade 6, and the mat-shaped seedling W whose root connection with the seedling raising box 1 has been released is placed on the seedling rake plate H. The cutting blade 6 remains in the nursery box 1 in the retracted state, and only the cutting blade 6 returns (moves backward). At this time, only the drum shaft 11 is reversely rotated by the one-way clutch 21 mounted on the first cam shaft 14, and the pull-out promoting mechanism e (see FIG. 4) functions to maintain the posture of the hook-shaped member 13. As a result, the mat-shaped seedling W easily comes off from the hook-shaped member 13. Then, the drum 12 rotates in the reverse direction to the original position, and the cutting blade 6 returns to the standby position. By operating the seedling rake plate H, the mat-shaped seedling W can be taken out of the seedling raising box 1. At this time, each of the mechanisms a to e and h also returns to the original standby state. Next, the structure of each part will be described.

As shown in FIGS. 1 to 6, the cutting portion B includes a lifting device 5 for forcibly lifting and turning one end of the mat-shaped seedling W of the seedling raising box 1, and a mat-shaped seedling W having one end lifted. A cutting device 7 which pushes the cutting blade 6 between the upper and lower sides of the seedling raising box 1 to drive and cut the root of the lower mat-like seedling from the seedling placing surface 1a of the seedling raising box 1; And a drive mechanism 8 for supplying the power to the main body frame 2. The drive mechanism 8 includes an electric motor 9 and a gear mechanism 10, and the gear mechanism 10 transmits a gear to a drum shaft 11 described later.

As shown in FIG. 10, the cutting device 7 is equipped with two flexible cutting blades 6 made of metal such as spring steel wound in parallel on a drum 12 having a drum shaft 11. It is configured. The cutting blade 6 has a length sufficient to reach the box end of the seedling raising box 1 placed on the mounting portion A, and the end portion thereof is fixed to the drum 12. When the drum shaft 11 is driven to rotate forward in the direction of arrow A, the cutting blade 6 is unwound from the drum 12 and protrudes in the direction of the mounting portion A. When the drum shaft 11 is driven to rotate in the direction shown by arrow B, the cutting blade 6 is wound around the drum 12 and stored.

As shown in FIGS. 10 and 11, the cutting blade 6 is formed by arranging two extremely thin (t = 0.5) spring steels on the left and right side in parallel. A raised portion 6R formed by partially cutting and raising the cutting blade 6 so that the side is raised upward is formed on the left and right.
That is, the raised portion 6R has a claw shape having the rear inclined surface 6a and the front pressing portion 6b.

Also, as shown in FIGS. 1 to 6, the right and left ends of the cutting blade 6 are pushed in the direction of pressing the seedling rake plate H downward immediately before the drum 12 in the middle of the pushing movement path of the cutting blade 6. A guide roller 40 and a lower guide roller 41 whose position is fixed below the guide roller 40 are arranged. The upper guide roller 40
The tension spring 42 acting on the rotating shaft is pressed and urged toward the lower fixed roller 41 to prevent the seedling rake plate H from moving upward from the cutting blade 6.

On the other hand, on the left and right of the longitudinal end of the seedling rake plate H, there are formed claw holes 43 for engaging the raised portions 6R of the cutting blade 6, and when the cutting blade 6 is retracted. Escape groove 44 for avoiding interference with raised portion 6R
Is continuously formed from the claw hole 43 to the rear end of the seedling rake plate H. Further, the left and right ends of the stepped handle portion 45 at the rear end of the seedling rake plate H are notched so as to allow passage of the guide roller 40, and the seedling rake plate H passes through the guide roller 40 when the cutting blade 6 is completely pushed. It is possible to proceed.

As described above, as shown in FIG. 1, the tip of the seedling rake plate H is placed on the drum 12 and
Is started, the raised portion 6R engages with the claw hole 43 and is pushed and moved in an integrated state with the seedling rake plate H on its back, and pushes up and down between the upper and lower guide rollers 40 and 41 to pass therethrough. After that, it rushes between the raised seedling and the nursery box 1 (see FIGS. 2 and 3). When the cutting blade 6 reaches the front end of the seedling raising box 1 while cutting the root, the mat-shaped seedling W is replaced on the seedling rake board H at that time. A cutting device 7 having a structure in which the blade 6 moves also serves as a seedling placing device C (see FIGS. 4 and 5).

When the cutting blade 6 is pulled in and moved, as shown in FIG. 11, the raised portion 6R and the seedling rake plate H
Therefore, only the cutting blade 6 returns. Therefore, the pushing movement force is transmitted to the seedling rake plate H when the cutting blade 6 is pushed and moved by the raised portion 6R and the claw hole 43, and is pulled into the seedling rake plate H when the cutting blade 6 is pulled and moved. A one-way transmission mechanism i that functions so as not to transmit the moving force is configured.

As shown in FIGS. 6 and 7, the lifting device 5 is provided with a hooking mechanism a and a lifting / lowering mechanism outside one of the left and right sides of the main body frame 2 (the left side when the mounting portion A is a front side as a machine). Mechanism b,
A posture maintaining mechanism f and a lifting assist mechanism h are arranged, and a lifting prevention mechanism d and a pull-out facilitating mechanism e are arranged outside the other (the right side if the placing section A is a front as a machine). It is configured.

As shown in FIG. 6, a first camshaft 14 having a first cam 16 mounted on a drum shaft 11 and a second cam having a second cam 17 mounted on the first camshaft 14 are provided. Axis 15
Are arranged, and the shafts 11, 14, and 15 are gear-linked, and a transmission mechanism g that transmits power from the cutting device 7 to the first and second cams 16, 17 is configured. A quadruple link mechanism c in front of the second camshaft 15 includes an upper arm 22 swingable about a fulcrum X1, a lower arm 23 swingable about a fulcrum X2, and a pair of upper and lower arms 22, 23. And a movable lever 24 pivotally connected therewith. The lower arm 23 and the movable lever 24 are pivotally connected, and both of the lower arm 23 and the movable lever 24 are provided with a pivotable pivot shaft 19 which is rotatable relative to each other. The member 13 and the operated lever 18 are integrally mounted.

The hooking mechanism a has a structure in which the first cam 16 is kicked up and brought into contact with the operated lever 18 to rotate the pivot shaft 19 in a direction in which the hook-shaped member 13 swings downward. . The elevating mechanism b has a structure in which the second cam 17 kicks down and contacts the root end of the upper arm 22 to lift and move the movable lever 24. In other words, the hook-shaped member 13 swings down around the pivot shaft 19 whose axis is fixed by the hooking mechanism a, and the four-way link mechanism c reduces its vertical length by the elevating mechanism b. The hook-shaped member 13 is lifted and moved upward by moving in the direction in which it moves.

Further, the operating lever 37 pivotally supported at the fulcrum X3 at the upper rear portion of the main body frame 2 and the tip of the operated lever 18 are connected by a connecting link 38, and contact with the longitudinal middle portion of the operating lever 37. The lifting assist mechanism h is configured by attaching the applicable roller 39 to the second cam 17. This is because when the second cam 17 pushes the upper arm 22 downward, the roller 39 also pushes the action lever 37, and the hook-shaped member 13 is raised in parallel by the elevating mechanism b, and simultaneously the pivot shaft 19 is further moved. It is slightly rotated in the direction of arrow C. As a result, not only is the wobble of the hook-shaped member 13 prevented,
The complex movement moves upward while being stabbed and swayed by the seedling W, and functions to reliably lift and turn the seedling.

As shown in FIG. 7, the lifting prevention mechanism d
A third cam 25 attached to the first camshaft 14 and a fulcrum X
It comprises an upper right arm 26 that can swing around one turn. That is, during the operation of the hook mechanism a, the first camshaft 14
When the arc surface 25a of the third cam 25 centered at the center and the root-side protruding end 26a of the upper right arm 26 contact each other,
The upward movement of the quadruple link mechanism c, that is, the pivot shaft 19 is prevented. Therefore, when the hook-shaped member 13 descends and swings, the pivot shaft 19 does not escape upward and cannot enter the seedling W properly.

The pull-out facilitating mechanism e is composed of a fourth cam 27 attached to the second cam shaft 15 and a regulating arm 28 attached to the pivot 19. That is, before winding the cutting blade 6 by rotating the drum 12 in the reverse direction, it is necessary to lift the hook-shaped member 13 upward to separate it from the mat-shaped seedling W, so that the cutting blade 6 is terminated. In the vicinity of the state in which the hook-shaped member 13 is rushed and moved to above, the hook-shaped member 13 floating above the mat-shaped seedling W placed on the seedling rake board H is suspended in the air while the cutting blade 6 is being wound. Floating hook-shaped member 1
Make sure that 3 does not fall. In other words, the function of maintaining the pivot shaft 19 so as not to rotate in the direction of arrow C is exhibited, and the cutting blade 6 can be smoothly wound up without falling by its own weight and the hook-like member 13 entering the mat-shaped seedling W. It is.

An attitude maintaining mechanism f is provided for preventing the first camshaft 14 equipped with the one-way clutch 21 from rotating from the predetermined standby position (start position) when the drum 12 rotates in the reverse direction. is there. As shown in FIG.
The locking pin 29 deviated from the first camshaft 14 is bolted to the side surface of the first cam 16, and the bracket 31 and the locking pin bolted to the body frame 2 at the upper rear position of the first camshaft 14. 29 and a claw arm 34 urged by a return spring 33 so as to prevent the first cam 16 from rotating in the reverse direction (in the direction of arrow D). Formed notch 35
(Which can be engaged with the tip of the claw arm 34) to form a posture maintaining mechanism f.

That is, as shown in FIGS. 1 and 6, when the ratchet mechanism 36 is engaged and the protruding piece 16a of the first cam 16 is located immediately below the operated lever 18, the start is started. The locking pin 29 is located below the first camshaft 14, and the first cam 16 is urged and maintained such that the notch 35 urges and contacts the tip of the claw arm 34. Therefore, despite the presence of the one-way clutch 21, the rotation of the first camshaft 14 due to the reverse rotation of the drum 12 is reliably prevented, and the operation is started by rotating the drum 12 in the forward direction. Sometimes the first cam 16, that is, the lifting device 5, is adjusted to the normal start position.

As shown in FIG. 12, the seedling placement surface 1a of the seedling raising box 1 has both ends in the longitudinal direction of the box (about 100 m from the end).
The drainage hole 1b in (m) is omitted to form a flat surface so that the root does not become entangled with the drainage hole 1b.
Thus, the lifting movement of the seedling end by the hook-shaped member 13 can be easily performed.

[Another Embodiment] As shown in FIG. 13, by using a seedling raising box 1 which can be opened at one end, a root cutting machine having a cutting device 7 and a seedling placing device C and having no lifting device 5 is provided. May be configured. Also, although the overall length of the cutting device is long, the cutting blade 6 is configured as a rigid straight blade having no flexibility, and a root cutting device configured to be linearly driven by a rack and pinion structure, a hydraulic cylinder, or the like. Machine. In this case, if the rear end of the seedling rake plate H is pushed by the raised portion 6R, the claw hole 43, the escape groove 44 and the like become unnecessary.

As shown in FIG. 14, the raised portions 6R may be cut and raised so as to hold the thickness of the seedling rake plate H. Even in this case, the seedling rake plate H can be passed by the inclined surface 6a when the cutting blade 6 retracts, but the rear edge 43a of the claw hole 43 is closer to the lower side in the pushing movement direction. It is convenient if it is formed as follows.

[Brief description of the drawings]

FIG. 1 is a side view of a root cutter in a standby state.

FIG. 2 is a side view of the root cutting machine in a state where a hook-like member has protruded into a seedling.

FIG. 3 is a side view of the root cutting machine in a state where a seedling end is turned up.

FIG. 4 is a side view of the root cutter in a state where the cutting blade has entered deeply.

FIG. 5 is a side view of the root cutter with the cutting blade largely moved back;

FIG. 6 is a side view of a left portion of a frame showing a structure of a cutting portion.

FIG. 7 is a side view of the right side of the frame showing the structure of the cutting portion.

FIG. 8 is a plan view of the root cutter in a standby state.

FIG. 9 is a plan view of the root cutter in a state where the cutting blade has entered the terminal end.

FIG. 10 is a perspective view showing a relationship between a cutting blade and a rake plate.

FIG. 11 is a sectional side view showing an engagement structure between a cutting blade and a rake plate.

FIG. 12 is a perspective view of a nursery box.

FIG. 13 is a perspective view of a side-wall openable nursery box.

FIG. 14 is a sectional view showing another engagement structure between the cutting blade and the rake plate.

[Explanation of symbols]

 Reference Signs List 5 lifting device 6 cutting blade 7 cutting device 8 drive mechanism 40 guide roller 43 hole 44 escape groove 45 handle C seedling placing device H seedling rake plate i one-way transmission mechanism

Claims (7)

[Claims] A cutting device for pushing a cutting blade between upper and lower sides of a seedling box and a mat-shaped seedling grown thereby to drive and cut a root of the lower mat-shaped seedling from a seedling mounting surface of the seedling raising box; A root cutting machine for a seedling, comprising: a seedling placing device capable of placing a mat-shaped seedling whose root has been cut on a seedling rake plate. 2. A lifting device for forcibly lifting one end of a mat-shaped seedling grown in a nursery box from the seedling box, and pushing a cutting blade between the mat-shaped seedling whose one end is raised and the seedling box. A cutting device that drives and cuts the root of the lower mat-shaped seedling from the seedling mounting surface of the seedling raising box, and the cutting device comprises: a cutting blade; and a driving mechanism capable of pushing and moving the cutting blade. A root cutting machine for a seedling, comprising: a seedling mounting device capable of placing a mat-shaped seedling whose root has been cut on a seedling rake plate. 3. The seedling placement device according to claim 1, wherein the seedling placing device is configured such that the cutting device pushes out and moves the cutting blade in a state in which the seedling rake plate is carried. Root cutting machine. 4. When the cutting blade is pushed and moved, the pushing movement force is transmitted to the seedling rake plate, and when the cutting blade is pulled and moved, the drawing movement force is not transmitted to the seedling rake plate. 4. The root cutting machine for seedlings according to claim 3, further comprising a functioning one-way transmission mechanism. 5. The one-way transmission mechanism according to claim 1, wherein the raised portion formed by partially cutting and raising the cutting blade so that the lower side in the pushing movement direction is raised upward is configured to be able to push the seedling rake plate back. The root cutting machine for seedlings according to claim 4, which is configured. 6. A guide roller which is urged in a direction to press the seedling rake plate downward at each of the left and right ends of the cutting blade in the pushing movement path, and a stepped handle portion at a rear end of the seedling rake plate. The root cutting machine for seedlings according to any one of claims 3 to 5, wherein left and right ends are cut out to allow passage of the guide rollers. 7. A hole receiving a pushing drive force by the raised portion is formed in a bottom surface of the front portion of the seedling rake plate,
The escape groove for avoiding interference with the raised portion when the cutting blade is retracted is formed from the hole in the seedling rake plate to the rear end of the seedling rake plate. Seedling root cutting machine.