JP2667603B2 - Transmission structure for planting seedlings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a traverse mechanism for reciprocatingly moving a seedling ladder on which seedlings for planting, such as rush, are placed with a constant stroke. A planting mechanism for taking out the crop seedlings one by one and planting it in the field is provided, and a top member having an elongated engaging projection engaged with the spiral groove is formed on a screw shaft having a reciprocating spiral groove formed on the outer peripheral surface. The present invention relates to a transmission structure for planting seedlings, wherein the traverse mechanism is configured to laterally feed the seedling nest by fitting and relative rotation thereof.

[0002]

2. Description of the Related Art In the above-described transmission structure for planting seedlings, conventionally, for example, as disclosed in Japanese Patent Application Laid-Open No. 3-183407, the seedling rests are arranged at a pitch corresponding to the pitch of the rooting plate formed on the seedling rests. There was one that was configured to intermittently traverse and plant and operate.

[0003]

In the above-mentioned conventional structure, the roots of crop seedlings such as rush are severely entangled with each other, and the seedlings to be planted and the adjacent seedlings located on the side thereof may be entangled during planting operation. However, if the seedling rest is planted while being continuously traversed in such a state, a dragging phenomenon of the adjacent seedlings frequently occurs. The lateral movement is stopped. However, in the above-described conventional structure, the timing of stopping the intermittent drive between the top member and the screw shaft is not particularly considered, so that the engagement projection of the top member stops at an intermediate position of the spiral groove.
Then, in the case where the wall surface of the spiral groove is worn due to sliding contact resistance due to long-term use, when intermittently temporarily stopped, for example, the engaging projection stopped at an intermediate portion of the spiral groove is stopped as described above. When starting to rotate again from this state, the posture tends to be unstable due to frictional resistance at the time of rotation start, etc.In such a state, if you accidentally try to pass through the intersection of the spiral grooves, In some portions, the elongated engaging projections may be erroneously engaged with the grooves in the opposite direction different from the normal groove path, and there is a possibility that smooth lateral feeding of the seedling rest may not be performed. An object of the present invention is to eliminate the above disadvantages.

[0004]

According to a feature of the present invention, in the transmission structure for seedling planting described at the beginning, an intermittent rotation for intermittently rotating the screw shaft and the top member in the transverse feed mechanism intermittently. A mechanism is provided, and a drive timing is set to stop the traverse operation at the time of planting operation by the planting mechanism.
The rotation timing is set so that the engagement protrusion stops at the intersection of the reciprocating spiral groove.

[0005]

[Function] When the planting mechanism operates, the seedling rest is in a stopped state, so that the crop seedlings divided for each plant can be planted with certainty, and the seedlings are not planted while dragging the neighboring plant.
Smooth operation can be performed. In addition, when the movement of the seedling rest is stopped, the elongated engaging projections in the lateral feed mechanism stop at the intersections of the reciprocating spiral grooves, so that, for example, as shown in FIG. Then, it will stop in the state which engaged with the crossing groove part over the front and back. Then, even at the time of driving start where the posture of the engagement protrusion is likely to be unstable due to frictional resistance at the time of rotation start, since the groove has already straddled in the reverse direction crossing in the stopped state, it is mistakenly inserted into the reverse direction groove. It is possible to make sliding movements while reliably drawing a normal movement locus without engaging.

[0006]

Therefore, by setting the drive timing rationally, it is possible to reliably continue the seedling planting operation for each plant, and in the case where the wall of the spiral groove is worn due to long-term drive. Even if there is, no problem occurs in the engagement state between the spiral groove and the engagement protrusion, and the smooth lateral drive can be maintained.

[0007]

Embodiments will be described below with reference to the drawings. FIG.
Shows a transplanter for rush plants. This seedling transplanter is connected to the rear of a traveling body (not shown) via a link mechanism so as to be able to move up and down, and reciprocally moves sideways with seedlings placed at a constant pitch with respect to the planting transmission case 1 serving also as a frame. Then, seedlings are taken out one by one from a seedling take-out port 4 formed in a sliding rail 3 that slidably supports the seedling rest 2 provided in the rearwardly inclined position and the lower end of the seedling rest 2 and planted in a field. Prior to the planting operation of the planting mechanism 5, the planting mechanism 5 penetrates and acts on the seedling to be planted, pushes the seedling toward the seedling take-out port 4, and holds the seedling holding tool 6, which holds the seedling on the mud surface. It is configured to include a sliding ground float 7 and the like. An endless rotating belt type vertical feeding device 8 with projections is provided at a position below the seedling mounting surface 2a of the seedling mounting table 2, and at the end of the horizontal movement stroke, a predetermined amount of the mounted seedlings is taken out of the seedling removal port. 4 is sent out. The seedling holder 6 operates in synchronization with the planting operation of the planting mechanism 5, and the holding claws 11 penetrate into the seedlings to hold the seedlings before the planting operation of the planting mechanism 5, and the seedling removing operation is completed. After that, it is configured so as to swing back and forth in a retracted posture.

Next, the transmission structure will be described. As shown in FIG. 1, power is transmitted from the traveling machine body to a lateral input shaft 18 in the planting transmission case 1 via a bevel gear mechanism 17, and the input shaft 18 is extended in the planting width direction via a gear mechanism 19. It is configured to be transmitted to the planted drive shaft 20 that is extended. Then, power is transmitted from the drive shaft 20 to each of the plurality of planting mechanisms 5 via the chain transmission mechanism 21 to drive the crank swinging mechanism 13 to drive the planting claw 2 at the tip end.
2 moves up and down while drawing an almost elliptical locus in side view, and takes out seedlings from the seedling take-out port 4 and plant them in the field. The left and right ends of the input shaft 18 protrude outward from the case, drive cams 23 are provided on the left and right sides, and a swing shaft 25 formed on the back surface of the seedling stand 2 so as to be rotatable by left and right brackets. The moving arm 26 contacts and swings at the end of the lateral movement stroke of the seedling placing table 2 to drive the driving pulley 8 of the vertical feeding device 8 via the link mechanism 27 and the one-turn clutch 28.
a is configured to be rotationally driven by a predetermined amount. A screw shaft 30 having a reciprocating spiral groove 29 formed on the outer periphery is rotatably mounted in a state penetrating the planting transmission case 1.
The left and right side edges of 0 are connected to and supported by the bracket 31 on the back side of the seedling rest 2 in a freely rotatable and laterally fixed position. As shown in FIG. 3, a cylindrical shaft 32 is externally fitted to the outer peripheral portion of the screw shaft 30 so as to be relatively rotatable, and a driven gear 33 and the input shaft 18 are attached to the cylindrical shaft 32 so as to be rotatable integrally.
And the drive gear 34 attached to the gears are engaged with each other. A top member 36 having an engaging projection 35 which engages with the reciprocating spiral groove 29 is formed on a boss portion 32 a formed in the middle of the cylindrical shaft 32.
Is supported so as to be rotatable about an axis in a direction orthogonal to the axis of rotation of the screw shaft 30, and the cylindrical shaft 32 is supported in the planting transmission case 1 in a laterally fixed position. is there. And
When the cylindrical shaft 32 is rotationally driven, the engagement between the engagement protrusion 35 and the spiral groove 29 causes the screw shaft 3 to relatively move.
0, that is, the lateral feeding mechanism A is configured such that the seedling placing table 2 reciprocates and laterally moves at a constant pitch. The engagement protrusion 35
Is formed in a substantially elliptical elongated shape so as to smoothly guide the sliding movement in the groove.

An intermittent rotation mechanism B for intermittently rotating the screw shaft 30 with respect to the input shaft 18 which is constantly driven to rotate is provided, and the lateral feed operation is performed when the planting mechanism 5 performs the planting operation. The drive timing is set so as to stop, and the rotation timing is set so that the engaging projection 35 stops at the intersection of the reciprocating spiral groove 29 when the lateral feed operation is stopped. To elaborate,
As shown in FIG. 5, a driving gear 34 that meshes with a driven gear 33 attached to the screw shaft 30 is configured as a partial gear, a convex cam 37 is provided on a non-driven portion, and a concave cam 38 provided on the driven gear 33 is provided. The driven gear 33 is engaged so as to regulate the rotation thereof, and the number of teeth of the driven gear 33 and the number of teeth of the drive gear 34 are matched. Therefore, one rotation of the input shaft 18 causes the screw shaft 30 to rotate.
The state in which is rotated once and the state in which the rotation is stopped appear alternately. Thus, the intermittent rotation mechanism B is configured. Then, in the rotation stop state of the screw shaft 30, the engagement projection 35 stops at the intersection of the spiral groove 29 in a state of straddling the non-engagement groove 29, as shown in FIG. At the time of startup, there is no adverse effect such as sliding in an oblique posture and erroneously engaging and guiding toward a non-engaging groove due to frictional resistance accompanying the startup.

[0010] In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 Transmission system diagram

FIG. 2 is a side view of a seedling transplanter.

FIG. 3 is a partially cutaway front view of the transverse feed mechanism.

FIG. 4 is a diagram showing an engagement state of an engagement protrusion in a stopped state.

FIG. 5 is a side view of the intermittent rotation mechanism.

[Explanation of symbols]

 2 Nursery stand 5 Planting mechanism 29 Reciprocating spiral groove 30 Screw shaft 35 Engagement protrusion 36 Coma member A Lateral feed mechanism B Intermittent rotation mechanism

Claims (1)

(57) [Claims] 1. A traversing mechanism (A) for driving a seedling rest (2) on which plant seedlings for planting are mounted in a reciprocating lateral movement with a constant stroke is provided, and one end from a lower end of the seedling rest (2) is provided. A planting mechanism (5) for taking out the crop seedlings one by one and planting the same in a field is provided, and a screw shaft (30) having a reciprocating spiral groove (29) formed on the outer peripheral surface thereof is inserted into the elongated groove (29). The lateral feed mechanism (A) is configured to externally fit the top member (36) formed with the engaging projection (35) and to laterally feed the seedling rest (2) by their relative rotation. A seedling planting transmission structure, wherein the screw shaft (30) and the top member (36) in the transverse feed mechanism (A) are provided.
And an intermittent rotation mechanism (B) for intermittently rotating relative to each other. The drive timing is set so as to stop the traverse operation at the time of planting operation by the planting mechanism (5). In the above, the engaging projections (3
5) A transmission structure for planting seedlings, the rotation timing of which is set so as to stop at the intersection of the reciprocating spiral groove (29).