JP7271370B2 - Perforating device and sowing device with same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a perforating device and a seeding device having the same.

For example, Patent Literature 1 discloses a sowing device that makes a plurality of holes in soil at once and sows seeds in each of the holes. The seeding device described in Patent Literature 1 is configured to drill holes in the soil contained in each of the plurality of cells of the pot at once.

JP-A-2006-158238

By the way, in order to match the timing at which each of the plurality of seeds emerges from the soil surface, it is necessary to make the depth of the hole for sowing the seeds constant. However, for that purpose, it is necessary to make the level of the soil surface in which the plurality of holes are drilled uniform. That is, it is necessary to flatten the uneven soil surface. In the case of Patent Document 1, it is necessary to make the soil level of each of the plurality of cells of the pot the same. However, it takes time and effort to make the level of the soil surface uniform.

Accordingly, an object of the present invention is to drill a plurality of holes having a constant depth in a target surface such as an uneven soil surface at one time.

According to one aspect of the invention,
A drilling device for drilling a plurality of holes of constant depth in a target surface,
a moving head movable in the drilling direction;
a plurality of punching units mounted on the moving head in a state of being aligned in a direction orthogonal to the punching direction;
each of the perforating units
a perforating member provided movably in the perforating direction with respect to the moving head and for perforating the target surface;
a first elastic member elastically compressively deformed in the drilling direction when the drilling member approaches the moving head;
a stopper member provided movably in the drilling direction with respect to the drilling member and having a contact end that contacts the target surface;
The distance between the contact end of the stopper member and the tip of the perforating member is the same as the depth when the contact end of the stopper member is retracted to the moving head side with respect to the perforating member to the maximum extent. A perforating device is provided.

According to another aspect of the disclosure,
a perforating device as described above;
and a seed feeder for feeding seeds into the holes formed by the drilling device.

According to the present invention, multiple holes of constant depth can be drilled at once in a target surface, for example an uneven soil surface.

1 is a partial cross-sectional view showing a perforating device of a seeding device according to one embodiment of the present invention; The figure which shows one operation|movement in the perforation|drilling and seeding operation|movement of the perforation apparatus in a seeding apparatus. FIG. 2B shows an operation following the operation of FIG. 2A; FIG. 2C shows an operation following the operation of FIG. 2B; FIG. 2C shows an operation following the operation of FIG. 2C; FIG. 2C shows an operation following the operation of FIG. 2D; FIG. 2E shows an operation following the operation of FIG. 2E; FIG. 2F shows an operation following the operation of FIG. 2F; Diagram showing a conceptual punching device before punching Diagram showing a conceptual punching device after punching

EMBODIMENT OF THE INVENTION Below, it demonstrates, referring drawings for the punching apparatus of the sowing apparatus which concerns on one embodiment of this invention.

FIG. 1 is a partial cross-sectional view showing a perforating device in a seeding device according to one embodiment of the present invention. The XYZ coordinate system shown in the drawing is for facilitating understanding of the present invention, and does not limit the present invention. The Z-axis direction is perpendicular to the soil surface, the X-axis direction is perpendicular to the Z-axis direction, and the Y-axis direction is perpendicular to both the X-axis direction and the Z-axis direction. direction.

The seeding apparatus of the present embodiment is configured to sow seeds W in soil S accommodated in a plurality of cells 102A and 102B of pot 100, as shown in FIG. Specifically, a seeding device is provided with a perforating device 10 that perforates in a direction that intersects the soil surface SS (the Z-axis direction), and that perforates seeds W that are positioned at a certain depth D from the soil surface SS. is equipped. In FIG. 1, the level of the soil surface SS of the soil S of each cell 102A, 102B is not the same but different. Specifically, the level of the soil surface SS of the cell 102A is higher than the level of the soil surface SS of the cell 102B by ΔH.

As shown in FIG. 1, the perforating device 10 of the seeding device of the present embodiment includes a moving head 12 movable in the perforating direction (Z-axis direction) and a It has a plurality of punching units 14A, 14B mounted on the moving head 12 in a row. In addition, in the case of this embodiment, the punching direction is the vertical direction. In addition, the number of the plurality of punching units mounted on the moving head 12 may be three or more, and they are mounted on the moving head 12 in a state of being aligned in the X-axis direction and the Y-axis direction, that is, in a matrix form. may

In the seeding device of this embodiment, the moving head 12 of the drilling device 10 is arranged with respect to the pot 100 so that the plurality of drilling units 14A, 14B are positioned above the corresponding cells 102A, 102B. Next, when the moving head 12 descends toward the pot 100 (moves in the Z-axis direction), the plurality of drilling units 14A and 14B drill the soil S in the corresponding cells 102A and 102B.

In the seeding device of the present embodiment, the moving head 12 of the drilling device 10 may be moved in the drilling direction (Z-axis direction) by, for example, an actuator. In this case, the sowing device comprises a transport device (not shown), for example a transport conveyor, which arranges the pots 100 below the perforating device 10 . Alternatively, the moving head 12 of the drilling device 10 may be positioned above the pot 100 by moving vertically (Z-axis) and horizontally (X-axis and Y-axis).

In the case of this embodiment, the plurality of punching units 14A, 14B of the punching device 10 have the same structure, and include punching members 16A, 16B and first coil springs 18A, 18B (first elastic members). Prepare.

The punching members 16A and 16B are members for punching holes, and are provided movably in the punching direction (Z-axis direction) with respect to the moving head 12 .

Specifically, in the case of this embodiment, the drilling members 16A and 16B are composed of drilling tips 20A and 20B for drilling holes in the soil S, cylinder dampers 22A and 22B, and joint shafts 24A and 24B connecting these. ing.

The perforating tips 20A and 20B of the perforating members 16A and 16B come into contact with the soil surface SS when the moving head 12 descends toward the pot 100, and when the moving head 12 further descends from there, they push through the soil S and enter its interior. do. As a result, holes are drilled in the soil surface SS. Note that the shape of the drilling tips 20A and 20B may be changed according to the type of soil S. In other words, as long as the drilling tips 20A and 20B can enter the soil S, the shape of the drilling tips 20A and 20B does not matter. To accommodate all types of soil S, the drilling tips 20A, 20B may be detachable from the joint shafts 24A, 24B.

The cylinder dampers 22A, 22B of the perforating members 16A, 16B are composed of cylinders 22Aa, 22Bb and piston rods 22Ab, 22Bb that advance and retreat in the perforating direction (Z-axis direction) with respect to the cylinders 22Aa, 22Ba.

In the case of this embodiment, the tip ends of piston rods 22Ab and 22Bb of cylinder dampers 22A and 22B are fixed to moving head 12 . Drilling tips 20A, 20B are attached to the cylinders 22Aa, 22Ba via joint shafts 24A, 24B extending in the drilling direction (Z-axis direction).

Alternatively, the cylinders 22Aa, 22Ba of the cylinder dampers 22A, 22B may be fixed to the moving head 12, and the piercing tips 20A, 20B may be attached to the ends of the piston rods 22Ab, 22Bb.

The first coil springs 18A, 18B are arranged in the drilling units 14A, 14B so as to be elastically compressed and deformed in the drilling direction (Z-axis direction). In addition, the first coil springs 18A and 18B contact one end 18Aa and 18Ba contacting the moving head 12 and the flange portions 22Ac and 22Bc provided on the cylinders 22Aa and 22Ba of the cylinder dampers 22A and 22B during compressive deformation. and other ends 18Ab and 18Bb. That is, in the case of this embodiment, the cylinder dampers 22A, 22B of the perforated members 16A, 16B are arranged inside the first coil springs 18A, 18B. When the punching members 16A and 16B approach the moving head 12, the first coil springs 18A and 18B sandwiched between them are compressed and deformed.

Furthermore, the drilling units 14A, 14B are provided with stopper members 26A, 26B for limiting the depth of the holes formed by the drilling members 16A, 16B to a constant depth D. FIG.

In the case of this embodiment, the stopper members 26A and 26B are provided on the perforating members 16A and 16B via second coil springs 28A and 28B (second elastic members) and the second coil springs 28A and 28B. and contact members 30A, 30B.

The second coil springs 28A, 28B of the stopper members 26A, 26B are arranged in the punching units 14A, 14B so as to be elastically compressed and deformed in the punching direction (Z-axis direction). The joint shafts 24A, 24B of the piercing members 16A, 16B are arranged in the second coil springs 28A, 28B. Also, one ends 28Aa, 28Ba of the second coil springs 28A, 28B are fixed to the perforating members 16A, 16B (cylinders 22Aa, 22Ba of the cylinder dampers 22A, 22B thereof). Furthermore, the second coil springs 28A, 28B have a lower elastic modulus than the first coil springs 18A, 18B, for reasons described later.

The contact members 30A and 30B of the stopper members 26A and 26B are tubular members extending in the drilling direction (Z-axis direction) and provided with flange-shaped contact ends 30Aa and 30Ba that come into contact with the soil surface SS. Further, punching members 16A, 16B (punching tips 20A, 20B thereof) are inserted movably in the punching direction into internal spaces 30Ab, 30Bb of stopper members 26A, 26B. Furthermore, the ends of the stopper members 26A, 26B opposite to the contact ends 30Aa, 30Ba are fixed to the other ends 28Ab, 28Bb of the second coil springs 28A, 28B.

In the case of the present embodiment, the contact members 30A and 30B of the stopper members 26A and 26B have openings in their outer peripheral surfaces communicating with the internal spaces 30Ab and 30Bb, and seeds W are thrown into the internal spaces. Seed inlets 30Ac and 30Bc for The sowing device according to the present embodiment is connected to the seed inlets 30Ac and 30Bc and supplies a predetermined number of seeds W to the internal spaces 30Ab and 30Bb of the contact members 30A and 30B (not shown). ).

That is, the contact members 30A, 30B of the stopper members 26A, 26B are supported by the punching members 16A, 16B in a suspended state via the second coil springs 28A, 28B. Further, the contact members 30A and 30B are slidably supported in the drilling direction (Z-axis direction) with respect to the inserted drilling members 16A and 16B (the drilling tips 20A and 20B thereof).

Note that the punching units 14A and 14B may be configured such that a plurality of types of contact members having different seed inlet shapes depending on the shape of the seed W can be detachably attached.

So far, the configuration of the seeding device according to the present embodiment, particularly the configuration of the perforating device 10 included in the seeding device has been described. From now on, the operation of the drilling device 10, that is, the drilling/sowing operation of drilling a hole of a certain depth D and sowing (arranging) seeds in the hole will be described.

2A to 2G are diagrams showing the drilling/seeding operation of the drilling device in the seeding device according to the present embodiment. 2A to 2G, the first and second coil springs 18A, 18B, 28A, 28B are simply shown. 2A-2G also illustrate the operation of the drilling device 10 when the soil surface SS of the soil S in each cell 102A, 102B of the pot 100 has different levels.

First, as shown in FIG. 2A, when the drilling device 10 (moving head 12 thereof) moves toward the soil S (toward the pot 100), the contact end of the contact member 30A of the stopper member 26A in one drilling unit 14A 30Aa contacts the soil surface SS of the soil S in the corresponding cell 102A.

In contrast, the other drilling unit 14B does not contact the soil surface SS of the soil S in the corresponding cell 102B. This is because the level of the soil surface SS of the cell 102B is lower than the level of the soil surface SS of the cell 102A by ΔH.

Next, as shown in FIG. 2A, the seed W is thrown through the seed inlet 30Ac into the internal space 30Ab of the contact member 30A that is in contact with the soil surface SS of the cell 102A. Thereby, the seed W is arranged on the soil surface SS below the drilling tip 20A.

When the drilling device 10 (moving head 12 thereof) moves further toward the soil S (pot 100) from the position shown in FIG. 2A, as shown in FIG. 2B, in one drilling unit 14A, the second coil spring 28A is pushed by the contact member 30A contacting the soil surface SS of the cell 102A and is compressed and deformed. At this time, since the contact end 30Aa of the contact member 30A is flange-shaped, it is difficult for the contact member 30A to sink into the soil S even if it is biased by the second coil spring 28A in a compressed state. In addition, since the elastic modulus of the first coil spring 18A is higher than that of the second coil spring 28A, the first coil spring 18A is not substantially deformed by compression.

On the other hand, in the other drilling unit 14B, the contact end 30Ba of the contact member 30B of the stopper member 26B contacts the soil surface SS of the soil S in the corresponding 102B.

Next, as shown in FIG. 2B, seeds W are thrown through the seed inlet 30Bc into the internal space 30Bb of the contact member 30B that is in contact with the soil surface SS of the cell 102B. Thereby, the seed W is arranged on the soil surface SS below the drilling tip 20B.

When the drilling device 10 (moving head 12 thereof) moves further toward the soil S (pot 100) from the position shown in FIG. 2B, as shown in FIG. 2C, in one drilling unit 14A, the second coil spring 28A is further compressed and deformed. As a result, the drilling tip 20A of the drilling member 16A moves within the contact member 30A, and the tip 20Aa comes into contact with the soil surface SS. The seed W is pushed into the soil S by the perforating tip 20A.

On the other hand, in the other drilling unit 14B, although the second coil spring 28B is compressed and deformed, the tip 20Ba of the drilling tip 20B does not contact the soil surface SS.

When the drilling device 10 (moving head 12 thereof) moves further from the position shown in FIG. 2C toward the soil S (pot 100), as shown in FIG. contacts the soil surface SS. The seed W is pushed into the soil S by the perforating tip 20B.

As shown in FIG. 2D, the drilling tip 20A and the contact member 30A in one drilling unit 14A are in contact with the soil surface SS, and the drilling tip 20B and the contact member 30B in the other drilling unit 14B are in contact with the soil surface SS. are doing. In this case, the second coil springs 28A of one punching unit 14A and the second coil springs 28B of the other punching unit 14B are compressed to the same extent.

On the other hand, the first coil springs 18A of one punching unit 14A and the first coil springs 18B of the other punching unit 14B differ in the amount of compressive deformation, and the former is more compressively deformed than the latter. are doing. This compressive deformation amount difference ΔP is equal to the level difference ΔH between the soil surface SS of the cell 102A and the soil surface SS of the cell 102B. Therefore, the drilling tip 20A of the drilling member 16A biased by the first coil spring 16A hits the soil surface with a greater force than the drilling tip 20B of the drilling member 16B biased by the first coil spring 16B. I am in contact with SS.

When the drilling device 10 (moving head 12 thereof) moves further from the position shown in FIG. 2D toward the soil S (pot 100), the first coil spring 18A of one drilling unit 14A and the first coil spring 18A of the other drilling unit 14B and the coil spring 18B are further compressed and deformed. When the amount of compressive deformation increases to some extent, the piercing tips 20A and 20B begin to push into the soil S due to the biasing force of the first coil springs 18A and 18B. That is, the seed W begins to be pushed into the soil S.

As shown in FIG. 2E, the drilling tip 20A of the drilling member 16A of one drilling unit 14A advances through the soil S ahead of the drilling tip 20B of the drilling member 16B of the other drilling unit 14B. This is because, as shown in FIG. 2D, when the drilling tip 20B of the other drilling unit 14B contacts the soil surface SS, the first coil spring 18A of one drilling unit 14A is already in contact with the first coil spring 18A of the other drilling unit 14B. This is because it is greatly compressed compared to the coil spring 18B of No. 2.

When the piercing tips 20A and 20B of the piercing members 16A and 16B are pushed through the soil S by the movement of the moving head 12, the distance between the tips 20Aa and 20Ba and the contact ends 30Aa and 30Ba of the contact members 30A and 30B increases. continue. That is, the contact members 30A and 30B move relatively to the moving head 12 side with respect to the punching members 16A and 16B. As a result, the second coil springs 28A, 28B are compressed.

When the drilling device 10 (moving head 12 thereof) moves further from the position shown in FIG. 2E toward the soil S (pot 100), as shown in FIG. movement in the soil S stops. At this time, the first coil spring 18A is compressed to the maximum, whereby the contact end 30Aa of the contact member 30A of the stopper member 26A is retracted to the maximum with respect to the piercing member 16A, and further retraction is restricted. . As a result, the contact end 30Aa of the contact member 30A stops at a position separated by a distance D toward the moving head 12 from the tip 20Aa of the punch tip 20A.

In this manner, the contact end 30Aa of the contact member 30A stops at a position separated by the distance D from the tip 20Aa of the drilling tip 20A toward the moving head 12, so that the contact end 30Aa of the contact member 30A reaches the soil surface SS. , the tip 20A of the drilling tip 20A stops at a position separated by a distance D from the soil surface SS. As a result, the drilling tip 20A drills a hole of a constant depth D in the soil S, and the seed W is arranged at a position of a constant depth D from the soil surface SS.

As shown in FIG. 2F, in one of the drilling units 14A, the movement of the drilling tips 20A of the drilling members 16A in the soil S stops, but in the other drilling unit 14B, the drilling tips 20B of the drilling members 16B move into the soil S. Continues to move inside.

When the drilling device 10 (moving head 12 thereof) moves toward the soil S (pot 100) from the position shown in FIG. 2F, the drilling tip 20B of the drilling member 16B is also moved in the other drilling unit 14B as shown in FIG. 2G. movement in the soil S stops. As a result, for the same reason as the one drilling unit 14A, the other drilling unit 14B drills a hole of a constant depth D in the soil S of the corresponding cell 102B, and the seed W rises to a constant depth D from the soil surface SS. position.

After the movement of the drilling tip 20A of the drilling member 16A of one drilling unit 14A in the soil S stops, the movement of the drilling tip 20B of the drilling member 16B of the other drilling unit 14B in the soil stops. Until then, the first coil spring 18A of one punching unit 14A is compressed and deformed. Thereby, the moving head 12 can move toward the soil S without being obstructed by the one drilling unit 14A which has finished drilling a hole of a certain depth D.

Finally, as shown in FIG. 2G, when holes of a certain depth D have been punched in both of the cells 102A and 102B of the pot 100, the first coil springs 18A of one punching unit 14A and the other The compression amount difference ΔP between the drilling unit 14B and the first coil spring 18B substantially matches the level difference ΔH between the soil surface SS of the cell 102A and the soil surface SS of the cell 102B. That is, the first coil springs 18A, 18B of the drilling units 14A, 14B absorb the level difference of the soil surface SS between the cells 102A, 102B.

As shown in FIG. 2G, when the soil S of the cells 102A and 102B has been bored with a certain depth D (when the seed W has been placed at a certain depth D from the soil surface SS), the boring device 10 departs upward from the soil S (pot 100). Then, the seeding apparatus according to the present embodiment arranges the drilling device 10 above the next cell, and starts drilling and seeding work for the soil in the next cell.

According to the embodiment as described above, as shown in FIG. 2A, a plurality of holes having a constant depth are applied to the soil S in the plurality of cells 102A and 102B of the pot 100 having different levels of the soil surface SS. can be worn at once.

Supplementally, as shown in FIGS. 2E to 2G, the start timing of drilling the soil S of the cell 102A by one drilling unit 14A and the start timing of drilling the soil S of the cell 102B by the other drilling unit 14B are completely different. does not match Similarly, the punching end timings do not match perfectly. However, the drilling device 10 (its moving head 12) can approach the pot 100 only once to drill holes into the soil S in each cell 102A, 102B of the pot 100 at one time.

In addition, the drilling device 10 according to the present embodiment is not limited to drilling holes in the soil S in the cells 102A and 102B of the pot 100, but also for drilling holes in uneven soil surfaces such as fields. Multiple holes in D can be drilled at once. In this case, for example, the drilling device 10 may be mounted on an agricultural machine capable of traveling in a field or the like.

Although the present invention has been described with reference to the above-described embodiments, the embodiments of the present invention are not limited to these.

For example, in the case of the embodiment described above, as shown in FIGS. 2A and 2B, seeds W are placed on the soil surface SS before the drilling units 14A and 14B drill holes. Then, as shown in FIG. 2G, the seed W is pushed to a certain depth D from the soil surface SS by the drilling members 16A and 16B (the drilling tips 20A and 20B thereof) of the drilling units 14A and 14B. However, embodiments of the present invention are not limited to this. For example, after the drilling units 14A and 14B drill holes in the soil surface SS and leave the holes, the seeds W may be supplied to the holes. Further, for example, when the soil is hard, holes as pilot holes may be drilled by the drilling units 14A and 14B. First, the drilling units 14A and 14B drill a hole as a pilot hole in the soil surface SS, and once withdraw from the pilot hole. After the seed W is thrown into the pilot hole, the drilling units 14A and 14B push the seed W thrown into the pilot hole deep into the soil S.

In the case of the above-described embodiment, as shown in FIGS. 2A and 2B, the seed supply device (not shown) is connected to the contact members 30A and 30B of the stopper members 26A and 26B in the punching units 14A and 14B of the punching device 10. Seeds W are supplied to the soil S via. That is, the seed supply device and the punching device 10 are integrally connected. However, embodiments of the present invention are not limited to this. For example, the seed feeder and the piercing device may be separate and the seed feeder feeds the seed into the hole formed by the piercing device.

Furthermore, in the case of the above-described embodiment, as shown in FIG. 1, the piercing member 16A is arranged in the first coil spring 18A and the second coil spring 28A, and the piercing member 16A is arranged in the first coil spring 18B. A piercing member 16B is positioned within and within the second coil spring 28B. Further, the contact members 30A, 30B of the stopper members 26A, 26B are cylindrical, and the perforating members 16A, 16B are inserted into the contact members 30A, 30B. Thereby, the width size (the size in the X-axis direction and the Y-axis direction) of each of the punching units 14A and 14B can be reduced. As a result, the space between the plurality of punching units 14A, 14B can be reduced, and as a result, many punching units 14A, 14B can be mounted on the moving head 12. FIG. However, it is also possible to construct the piercing unit without arranging the piercing member in the first and second coil springs and/or inserting it into the contact member.

That is, the above-described embodiment shown in FIGS. 1-2G is but one embodiment of the present invention. A punching device according to the present invention can be represented conceptually as shown in FIGS. 3A and 3B.

FIG. 3A shows a conceptual drilling device before drilling, and FIG. 3B shows a conceptual drilling device after drilling.

As shown in FIGS. 3A and 3B, the drilling device 210 is a device that drills a plurality of holes with a constant depth D in an uneven target surface TS such as a soil surface at once. and a plurality of punching units 214A and 214B mounted on the moving head 212 in a state of being aligned in a direction perpendicular to the punching direction (X-axis direction).

The punching units 214A and 214B are provided movably in the punching direction (Z-axis direction) with respect to the moving head 212, and are punching members 216A and 216B for punching holes in the target surface TS, and punching members 216A and 216B for the moving head 12. Elastic members 218A and 218B that are elastically compressed and deformed when 216A and 216B approach each other, and contact ends that are provided movably in the drilling direction with respect to the drilling members 216A and 216B and that come into contact with the target surface TS. and stopper members 226A and 226B.

Then, as shown in FIG. 3B, when the contact ends of the stopper members 226A and 226B are retracted to the moving head 212 side with respect to the punching members 216A and 216B, the contact ends of the stopper members 226A and 226B and the punching member 216A and 216B are in contact with each other. The distance from the tips of the members 216A and 216B is the same as the depth D.

According to this conceptual drilling device 210, the elastically compressive deformable elastic members 218A, 218B may be coil springs, bellows tubes, cylindrical rubber members, pneumatic or hydraulic It may be a cylinder, a spring, or the like. Similarly, the second elastic members (second coil springs 28A, 28B) of the stopper members 26A, 26B in the above-described embodiment shown in FIG. It may be a pressure or hydraulic cylinder, spring, or the like. In addition, projections 216Aa and 216Ba such as flanges serve as structural elements for locking the stopper members 226A and 226B at positions where the stopper members 226A and 226B are retracted to the maximum with respect to the piercing members 216A and 216B. may be provided in

As described above, the above embodiment has been described as an illustration of the technique of the present invention. To that end, the accompanying drawings and detailed description have been provided.

Therefore, among the components described in the attached drawings and detailed description, there are not only components essential for solving the problem, but also components not essential for solving the problem in order to illustrate the technology. can also be included. Therefore, it should not be immediately recognized that those non-essential components are essential just because they are described in the attached drawings and detailed description.

Also, the above-described embodiments are intended to illustrate the technology of the present invention, and various modifications, replacements, additions, omissions, etc. can be made within the scope of the claims or equivalents thereof.

The drilling device according to the present invention can be applied not only for the purpose of seeding, but also as a device for drilling a plurality of holes at once.

Reference Signs List 10 punching device 12 moving head 14A punching unit 14B punching unit 16A punching member 16B punching member 18A first elastic member (first coil spring)
18B first elastic member (first coil spring)
26A stopper member 26B stopper member D depth

Claims (7)

A drilling device for drilling a plurality of holes of constant depth in a target surface,
a moving head movable in the drilling direction;
a plurality of punching units mounted on the moving head in a state of being aligned in a direction orthogonal to the punching direction;
each of the perforating units
a punching member including a convex portion, provided movably in the punching direction with respect to the moving head, and punching a hole in the target surface;
a first elastic member elastically compressively deformed in the drilling direction when the drilling member approaches the moving head;
a stopper member provided movably in the drilling direction with respect to the drilling member and having a contact end that contacts the target surface;
When the stopper member is locked by the convex portion of the punching member and the movement toward the moving head is restricted, the contact end of the stopper member is maximally retracted toward the moving head with respect to the punching member. and wherein the distance between the contact end of the stopper member and the tip of the piercing member is the same as the depth.
The stopper member includes a second elastic member that is elastically compressed and deformed in the piercing direction, and a contact member that is provided on the piercing member via the second elastic member and has the contact end,
the elastic modulus of the second elastic member is lower than the elastic modulus of the first elastic member, and
2. The punching device according to claim 1, wherein the convex portion of the punching member engages the contact member via the second elastic member .
The contact member is cylindrical,
3. The perforating device according to claim 2, wherein said perforating member is inserted into said contact member movably in said perforating direction.
4. The perforating device of claim 3, wherein the contact end of the contact member is flange-shaped.
5. The perforating device according to claim 3, wherein an outer peripheral surface of said contact member is provided with an opening communicating with an internal space thereof.
wherein the first and second elastic members are coil springs,
A perforating device according to any one of claims 2 to 5, wherein the perforating member is arranged within the first and second elastic members.
A punching device according to any one of claims 1 to 6;
a seed feeder for feeding seeds into the holes formed by the drilling device.

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