JPH081617Y2 - Transplanting device for seedling table of transplanter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a lateral feeding device for a seedling table in a transplanter such as a rice transplanter, and more particularly to prevent damage to the screw groove when the guide piece moves laterally. The present invention relates to a seedling table lateral feeding device for a transplanter, which has been improved in order to reduce failures and increase durability of a screw shaft and a guide piece.

Conventionally, as shown in FIG. 13, a four-wheel drive type traveling vehicle body 1
There is known a riding type rice transplanter (planting machine) 4 having a seedling planting section 3 attached to a rear part of the seedling planting section 3 via a lifting link 2.
As shown in FIG. 14, the transplanted seedlings are placed and the seedling placing table 5 is provided so as to reciprocate laterally with a predetermined stroke,
A slide block 8 is provided on a slide rod 8 linked to the seedling placing table 5 via connecting arms 7, 7, and a guide piece 10 is inserted into the slide block 9 so as to be rotatable in the axial direction. Some have a continuous screw groove 13 that fits with a guide portion 11 provided at the end of the guide piece 10 in the axial direction, and a screw shaft 12 that rotates in a predetermined direction. The guide piece 10 has a columnar shape as shown in FIGS. 15 to 17, is rotatable in the axial direction thereof, and is provided with a guide portion 11 at its axial end. As shown in FIG. 14, when the guide portion 11 is fitted into the screw groove 13 of the screw shaft 12 and the screw shaft 12 rotates in a predetermined direction (arrow direction), the guide piece 10 receives a lateral feeding action, Seedling stand 5 through slide block 9, slide bar 8 and connecting arms 7, 7.
To move laterally.

[Problems to be solved by the device]

When reaching the outer end of the screw groove 13 from the guide portion 11 and switching the moving direction to the opposite direction, the guide portion 11 rotates along the screw groove 13 by a predetermined angle, and together with this, the guide piece. Although 10 rotates, the end face of the guide piece 10 opposite to the guide portion 11 is the side surface 8a of the slide rod 8 as shown in FIG. 18, and the guide 11 portion side guide as shown in FIG. The end surface of the piece 10 is in strong line contact with the surface 12a of the screw shaft 12, and the rotation resistance of the guide piece 10 becomes large, so that the turn portions at both ends of the screw groove 13 do not rotate smoothly, and the screw groove Since the groove width of 13 is constant and the bottom surface of the screw groove 13 is flat, when the guide piece 10 turns without rotating sufficiently, the guide portion 11 makes strong contact with the side surface of the screw groove 13. Or the screen shown in Fig. 14 And or riding a mountain portion 13a of Liu groove 13, by advancing the or causing failure abrasion has a problem such or poor durability.

Further, in recent years, a rice transplanter has been put into practical use in which the seedling plant 14 of the seedling planting section 3 is of a rotary type to increase the seedling planting speed, and thus the moving speed of the seedling platform 5 is increased. The faster the moving speed of the guide piece
Since the load on the guide portion 11 and the screw groove 13 of 10 becomes large, improvement thereof is desired.

The present invention has been made to solve the above problems.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention provides (1) a seedling placing table provided to place a transplanted seedling and reciprocally move in a lateral stroke, and a slide rod linked to the seedling placing table. A slide block is provided in the slide block, and a sguide piece that is fitted into the slide block so as to be rotatable in the axial direction and a continuous screw groove that fits with a guide portion provided at the axial end of the guide piece are provided. Have,
In a seedling platform horizontal feeding device equipped with a screw shaft that rotates in a predetermined direction, the outer wall of the screw groove at the outer end of the screw shaft, the shaft diameter of the screw shaft to the innermost portion of the screw shaft. , Slightly smaller than the shaft diameters of the other main parts of the screw shaft, (2) the guide part is turned along the screw groove at the outer end of the screw shaft, and the guide part is formed at the first screw groove crossing point. A cutout portion is formed at a rear corner portion in the axial direction in the traveling direction of (3) so that the center of the screw shaft in the axial direction and the center of the guide piece in the axial direction of the screw shaft are displaced from each other. (4) A recess recessed toward the axial center is formed on the bottom surface of the screw groove, and the guide piece is pressed toward the recess. It was so that the elastic support, and is characterized in, respectively.

[Action]

With the above configuration, the present invention provides: Rotation of the guide piece in the slide block becomes easy, and even at the turn parts at both ends of the screw groove on the screw shaft, the guide part strongly contacts the side surface of the screw groove or rides on the mountain part of the screw groove. Is avoided.

． Since the notch is formed at the corner of the intersection of the screw groove where the guide piece turns and the guide portion first hits, the guide portion is smoothly guided along the screw groove.

． A rotating force acts on the guide piece due to the feeding action of the screw groove with respect to the guide portion, so that the guide piece is reliably rotated.

． Since the guide portion always moves in the deepest part of the concave bottom surface of the screw groove, it does not ride on the intersections, corners, etc. of the screw groove or strongly contact the side surface of the screw groove.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, but the same parts as those of the above-described conventional example will be denoted by the same reference numerals and detailed description thereof will be omitted.

In the first embodiment shown in FIGS. 1 to 3, the screw groove 1 at the outer end 12b of the screw shaft 12
The outer wall 3 forms the gap S by making the shaft diameter d ₂ of the screw shaft 12 to the innermost portion 15 of the screw shaft 12 slightly smaller than the shaft diameters d ₁ of the other screw shafts 12. Therefore, when the guide piece 10 is at the side end of the screw groove 13, the guide portion of the guide piece 10
The 11-side end surface 10a does not come into contact with the screw shaft surface 12a on one side from the guide portion 11, but makes a line contact with the screw shaft surface 12a on the other side from the guide portion 11. In FIG. 1, reference numeral 13b is a reverse screw groove (turn portion).
Indicates.

In the seedling table lateral feeding device of the first embodiment having such a configuration, the screw shaft 12 rotates in a predetermined direction to laterally move the guide portion 11 along the screw groove 13, and the guide piece 10 and the slide block 9 are moved. Then, the seedling placing table 5 is reciprocally moved laterally with a predetermined stroke through the slide rod 8 and the connecting arm 7. Then, the guide portion 11 has the reverse screw groove 13b.
When reaching the position, the guide portion 11 slightly rotates along the reverse screw groove 13b, and the guide piece 10 also rotates at the same time. When this guide piece 10 rotates, as shown in FIG. 2, the left guide piece end surface 10a of the guide portion 11 does not come into contact with the screw shaft outer end portion 12b with a gap S, but the other end. Only the end face is the screw shaft surface 12
Since it is in contact with a, as shown in FIG.
At 0, the force Fa from the screw groove 13 in the sliding direction of the guide portion 11 and the moment to rotate in the arrow direction due to the frictional force F with the screw shaft 12 are received. Therefore, the guide portion 11 easily follows and rotates along the screw groove 13 (including the reversing screw groove 13b) and strongly abuts the side surface of the screw groove 13 or rides on the mountain portion 13a of the screw groove 13. It does not cause a failure or accelerate wear.

In the second embodiment of the present invention shown in FIGS. 4 and 5, the screw groove is formed at the outer end of the screw shaft 12.
The guide piece 10 (guide portion 11) slides along 13 and is turned by the reversing screw groove 13b, and then at the first screw groove intersecting portion 16, the guide piece 10 is positioned at the axial rear corner portion in the traveling direction of the guide portion 11. The notch 17 is formed by Δb. Reference numeral 13c indicates a normal screw groove intersection, α
Indicates the cut-off taper angle of the cut-out portion 17, α ′ indicates the rotation angle of the guide portion 11, and b indicates the width of the screw groove 13.

In the seedling table horizontal feeding device of the second embodiment having such a configuration, when the guide portion 11 of the guide piece 10 turns at the end of the screw groove 13 and then approaches the first intersection portion 16, Since the guide portion 11 does not rotate sufficiently, the tip of the guide portion 11 faces a direction slightly crossing the screw groove 13, but since the cutout portion 17 is provided, collision is avoided, and the guide portion When 11 further advances, it comes into contact with the wall surface of the screw groove 13, but the contact angle is shallow, and the guide piece 10 is rotated by α degrees more than normal movement to α ′ degree,
When approaching the normal intersection 13c, screw groove 1
It does not come into strong contact with the side surface of 3 or ride on the mountain portion 13a of the screw groove 13, and thus does not cause a failure or accelerate wear.

In the third embodiment of the present invention shown in FIGS. 6 and 7, the center C of the screw shaft 12 in the axial direction and the center C of the guide piece 10 in the axial direction of the screw shaft 12 are used.
The center O of the guide portion 11 is provided so as to be displaced from the center O of the guide portion 11, and the center 11a of the guide portion 11 in the longitudinal direction is provided so as to be displaced from the center O of the guide piece 10.

In the third embodiment having such a structure, when the screw shaft 12 rotates and the guide portion 11 moves along the screw groove 13 together with the guide piece 10 to the right in FIG. A force is applied to 11 in the direction F ₁ , and a rotational force in the direction F ₂ is applied to the guide piece 10, so that the guide piece 10 rotates smoothly. As a result, the guide portion 11 easily follows along the screw groove 13 and does not come into strong contact with the side surface of the screw groove 13 or ride on the mountain portion 13a of the screw groove 13 and cause a failure or accelerate wear. There is nothing to do.

In the fourth embodiment of the present invention shown in FIGS. 8 to 12, a slide for accommodating the guide piece 10 is formed on the bottom surface of the screw groove 13 so as to form an arcuate recess 13d recessed toward the axial center side. The guide part 11 is screwed into the block 9
A leaf spring 13 is provided that urges it toward the 13 (recess 13d) side.

In the fourth embodiment, the screw groove 13
The recess 13d is formed on the bottom surface of the
Since the guide portion 11 is pressed toward, the guide portion 11 slides along the central portion of the recess 13d due to the rotation of the screw shaft 12, and the guide portion 11 strongly abuts the side surface of the screw groove 13 even immediately after turning. , Screw groove
It does not ride on the mountain portion 13a of 13.

In addition, in each of the above-described embodiments, the case where the present invention is applied to the seedling planting portion of the riding type rice transplanter has been described.
The present invention can be applied not only to a walk-behind rice transplanter, but also to other transplanters that reciprocally move a seedling mount.

[Effect of device]

As described above, according to the seedling table lateral feeding device of the transplanter of the present invention, the following effects can be obtained.

(I). When the guide piece turns at both outer ends of the screw shaft, the guide part of the guide piece prevents the outer part from contacting the surface of the screw shaft, so that the guide piece tries to rotate toward the inside of the screw shaft. A moment is generated so that the guide piece can be easily and completely rotated and smoothly slid along the screw groove.

(B). After the guide piece turns at the outer end of the screw groove, a cutout is provided at the screw groove intersection that hits first, so the guide does not come into direct contact and the guide slides along the screw groove. Do not ride on the screw groove intersection or make strong contact with the screw groove side surface.

(C). Since the center of rotation of the guide piece is offset from the center line of the screw shaft, the sliding force of the guide portion causes a rotational force to act on the guide piece, so that the turn of the guide piece can be smoothly performed.

(D). Since the bottom surface of the screw groove is formed in a concave shape and the guide portion is biased against the screw groove, the guide portion always slides along the bottom portion of the screw groove bottom surface,
Do not come into strong contact with the side of the screw groove or ride on the intersection.

(E). From the above, it is possible to reduce the chance that the guide part of the guide piece will damage the side surface of the screw groove or ride on the intersection of the screw groove and cause a failure.
The durability of the screw shaft and the guide piece can be increased.

[Brief description of drawings]

FIG. 1 is a partial front view showing a screw shaft according to a first embodiment of the present invention, and FIG. 2 is a partial cross-sectional front view of an essential part,
FIG. 3 is an explanatory view of the action of the guide piece portion, FIG. 4 is a front view showing a main part of a second embodiment of the present invention, FIG. 5 is a partially developed view thereof, and FIG. 6 is a third embodiment of the present invention. 7 is a bottom view of the guide piece portion, FIG. 8 is a front view of the main portion of a fourth embodiment of the present invention, and FIG. 9 is a front view of the guide piece portion. Figures and 10 are bottom views of the guide piece, 11th
FIG. 12 is a side view of the same part, FIG. 12 is a front view of a guide piece assembled in a guide block, FIG. 13 is a side view of a riding-type rice transplanter to which the present invention is applied, and FIG. FIG. 15 is a partial cross-sectional view of the same main part, FIG. 15 is a side view of a conventional guide piece, FIG. 16 is the same front view, FIG. 17 is the same bottom view, FIG. It is a partial cross-sectional front view of a guide piece and a screw shaft. 1 ... Running car body, 2 ... Elevating link, 8 ... Seedling planting section, 4 ... Riding type rice transplanter (planting machine), 5 ... Seedling platform,
6 ... Lateral feed device, 7 ... Connecting arm, 8 ... Slide rod, 9 ... Slide block, 10 ... Guide piece, 11
…… Guide part, 12 …… Screw shaft, 12a …… Surface, 12b …… Outer end part, 13 …… Screw groove, 13a …… Mounting part, 13b …… Reversing screw groove, 13c …… Reversing screw groove intersection , 13d ...... Recess, 14 ...... Seedling implant, 15 ...... Innermost part of the screw shaft, 16 ...... Screw groove intersection, 17 ...... Cutout, 18 ...... Leaf spring.

Claims (4)

[Scope of utility model registration request] 1. A seedling placing table on which a transplanted seedling is placed and is reciprocally moved in a lateral direction with a predetermined stroke, and a slide block is provided on a slide rod linked to the seedling placing table. It has a guide piece that is inserted in the block so as to be rotatable in the axial direction, and a continuous screw groove that fits with a guide portion provided at the axial end of the guide piece, and rotates in a predetermined direction. In a seedling platform horizontal feed device including a screw shaft, the outer wall of the screw groove at the outer end of the screw shaft, the shaft diameter of the screw shaft up to the innermost portion of the screw shaft, other screw shaft main A seedling table horizontal feed device for transplanters characterized by being made slightly smaller than the shaft diameter of the part. 2. The guide piece is turned along the screw groove at the outer end of the screw shaft, and is formed at the first crossing portion of the screw groove after the guide piece is turned, and the guide piece is located at a corner portion in the axial rear surface in the traveling direction of the guide portion. The seedling platform lateral feed device of the transplanter according to claim 1, wherein a take-off portion is formed. 3. The arrangement according to claim 1, wherein the center of the screw shaft in the axial direction and the center of the guide piece in the axial direction of the screw shaft are displaced from each other. Transplanting device for seedling table of transplanter. 4. A recessed portion that is recessed toward the axial center is formed on the bottom surface of the screw groove, and the guide piece is elastically supported so as to press it toward the recessed portion (1) or (2).
Alternatively, the seedling platform lateral feed device of the transplanter according to (3).