JPH07121166B2 - Seedling structure of rice transplanter - Google Patents

Description

The present invention relates to a seedling stand structure for a rice transplanter.

[Conventional technology]

The seedling vertical feed mechanism in the current rice transplanters holds the seedlings so that they do not drop downward while the seedling stand is being driven horizontally, and when the seedling stand reaches the end of the horizontal feed stroke, the seedling is set downward only by the stroke. It has a feeding function, and is composed of a wide belt with projections and a star wheel.

Providing a protrusion that fits into the back surface of the seedlings in this way is effective because it can reliably hold the seedlings during horizontal feeding and vertically feed at the stroke end of horizontal feeding, but the seedlings on the seedling stand are reduced. When a new seedling is slid from above the seedling stand in such a case, for example, if a protrusion of the belt is exposed on the seedling placing surface, the seedling may be caught by this protrusion and the seedling may not be fed downward.

Therefore, by making it possible to switch the seedling vertical feeding mechanism between the working posture from the seedling placing surface and the retracted posture pulled downward,
For example, Japanese Utility Model Laid-Open No. 57-100833 discloses that the seedling vertical feed mechanism is set in a retracted position so that the seedlings can be slipped in from above when new seedlings are inserted.

[Problems to be Solved by the Invention]

In the above-mentioned conventional technique, since the switching between the action posture and the retracted posture is performed manually, there is a possibility that the seedling vertical feeding mechanism is left in the retracted posture and carelessly starts the rooting work to cause a rooting error. It was

Especially, since the seedling vertical feed mechanism is hidden under the supplied seedlings and cannot be seen, it was easy to forget to return to the working posture.

In order to solve the above problems, an object of the present invention is to enable normal planting even if the rooting operation is mistakenly started while the seedling vertical feeding mechanism is in the retracted posture.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a seedling vertical feed mechanism capable of switching between an action posture that comes out above an opening of a seedling placement surface in a seedling placement stand and a retracted posture that is pulled downward, and a vertical feed mechanism. It is provided with a manipulating means for selectively switching between the working posture and the retracted posture, and in addition to the manipulating means, a return device for forcibly returning the vertical feed mechanism in the retracted posture to the working posture is provided. This return device is linked to the operation mechanism of the planting clutch so that it operates toward the forced return side with the engagement of the planting clutch, and the return device and the manual operation means are in a state where the vertical feed mechanism is in the working posture. In this case, the operation of the reset device is not transmitted to the vertical feed mechanism, and the operation of the reset device is transmitted to the forced return side only when the vertical feed mechanism is in the retracted posture. Through the flexibility to allow the operation of It is associated, characterized in that are.

[Work]

According to the above configuration, when the planting clutch, which is indispensable for starting planting work of seedlings, is turned on and activated, the vertical feed mechanism will always return to the working posture. Even if you start the planting operation by forgetting to leave the vertical feed mechanism in the retracted position and leaving the seedlings in the feeding position, the vertical feed mechanism will automatically switch to the working position, and you will not get the planting error due to forgetting to return it as before. It will not happen.

When the restoring device is not operating, the posture of the vertical feeding mechanism can be freely switched by the artificial operating device by allowing the mutual operation of the restoring device and the artificial operating device, so that the vertical feeding mechanism can be retracted during seedling replenishment. Alternatively, it is possible to perform a manual operation such that the vertical feed mechanism is set to the working posture to prevent the seedlings from moving on the seedling mounting table during traveling, independently of the returning device.

Further, since the return device is separate from the manual operation means, there is no waste of the manual operation means being turned on and off each time the planting clutch is turned on and off, and the vertical feed mechanism is switched to the working posture. Therefore, there is no waste of switching to the retracted posture unnecessarily each time.

〔The invention's effect〕

As a result, after the seedlings have been replenished, the return device automatically returns the vertical feed mechanism to the working posture in conjunction with the operation of the planting clutch, and the return device and the manual operation means are linked through the flexible operation. Regardless of forgetting to return the artificial operation means, the seedling vertical feed mechanism also operates normally with the start of the planting work to perform good planting work, and the posture of the vertical feed mechanism is switched when the planting clutch is disengaged. We were able to provide a product with excellent handleability that could be freely set.

〔Example〕

Hereinafter, an embodiment of the present invention will be described as an example of a rice transplanter by applying it to a riding type rice transplanter with reference to the drawings.

As shown in FIG. 6, a planting case (31) is provided which is rotationally driven around the horizontal axis (P ₁ ) of the transmission case (14) extended rearward from the planting mission (1), The planting arms (2) are pivotally supported at both ends of the planting case (31), and the seedling stand (4) is reciprocally laterally driven on the guide rails (3) of the planting mission (1). ) Is equipped with a four-row planting type rice transplanter seedling planting device.

The transverse feed drive structure of the seedling stand (4) will be described in detail.
As shown in FIG. 6 and FIG. 4, one lateral feed shaft (5) projects from the left and right of the planting mission (1), and the seedling stand (4) is placed on the left and right of this lateral feed shaft (5). A support member (6) for use is connected. A reinforcing member (7) is erected and connected to both upper ends of the support member (6), and the connecting arm is swingable around the horizontal axis (P ₂ ) at the lower end of the support member (6). (8) is attached, and this connecting arm (8) is attached to the rear surface of the seedling stand (4). With the above structure, the seedling support table (4) is slid on the guide rails (3) by laterally driving the entire lateral feed shaft (5) left and right.

Next, the detailed structure of the longitudinal feeding of the mat-shaped seedlings (A) on the seedling placing table (4) will be described. As shown in Figs. One hexagonal shaft (15)
Is rotatably supported, and a pair of drive rollers (9) is provided for one value-added article of the seedling stand (4).
The drive roller (9) is fitted onto the hexagonal shaft (15) so as to be freely rotatable. A pair of drive rollers (9) are connected by a first connecting member (10) which is cylindrical and freely rotatable with respect to the hexagonal shaft (15), and two left and right driving rollers (9) are connected.
The driving rollers (9) are connected to each other by a second connecting member which is similar to the first connecting member (10) in the pair of value-added articles.
The drive roller (9) and the hexagonal shaft (15) are rotatably supported on the rear surface of the seedling stand (4) via a bracket (11). Further, a driven roller (12) and an auxiliary roller (23) are arranged above the drive roller (9), and a feed belt with a rubber protrusion as a seedling longitudinal feed mechanism (13) is wound around them. Is there.

Next, the structure for switching the feeding belt (13) between the working posture in which the feeding belt (13) moves upward from the opening of the seedling placing surface and the retracted posture in which the feeding belt (13) is retracted downward will be described in detail. As shown in FIG. 1 and FIG. A support arm as a posture switching unit (34) is pivotally supported around the horizontal axis (P ₅ ) of the bracket (33) of the stand (4), and at the lower end of the support arm (34). The driven roller (12) is rotatably supported, and the spring (35) with sufficient initial tension gives the driven roller (1
2) is lifted up.

On the other hand, the bracket (36) above the seedling stand (4)
Of [an example of the manual operation means] horizontal axis (P ₆₎ swingably switching lever around (37) with is rotatably supported, at both ends both brackets release the outer wires of the wire (38) (38a) ( 33) and (36) are connected, and the release wire (3
The inner wire (38b) of 8) is connected to the arm (22) of the support arm (34) and the switching lever (37). Then, as shown in FIGS. 1 and 2, the support frame (39) is attached to both brackets (33) and (36) in a state where the support frame (39) is inserted into the partition convex portion (4a) of the seedling placing table (4). It is erected and, as shown in FIG. 1, a support frame (39)
The upper bracket (36) is attached by bolt connection, and the lower bracket (33) is inserted.

The state shown in FIG. 1 is the working posture in which the feed belld (13) is raised above the opening of the seedling placing surface, and when the switching lever (37) is operated to swing upward, as shown in FIG. The wire (38b) is pulled toward the switching lever (37), and the driven roller (12) is pulled toward the left side in FIG. 2 by the support arm (34). When the driven roller (12) is pulled in this way, the driven roller (12) is pulled down by the tension of the feed belt (13), so the sling (35) is stretched and the spring (35) is attached. The supporting arm (34) tries to return to the state shown in FIG. 1 due to the force.

Then, when the seedling stand (4) reaches the stroke end of the lateral feed, the hexagonal shaft (15) is rotated by a set angle. If the structure is described in detail, as shown in FIG. A first rotating shaft (17) is laid across the support member (6), and one end of the first rotating shaft (17) is extended to the vicinity of the seedling placing (4) end and The output side is supported by the pipe member (24) fixed to the support member (6), and the support arm (25) is attached to the hexagonal shaft (15) from the pipe member (24).
Is erected.

Then, a rod (19) is installed so as to span the first arm (17a) at the extension side end of the first drive (17) and the drive unit (18) of the hexagonal shaft (15). The drive (18) has a hexagonal shaft (1
A one-way clutch which is fitted to the outside of 5) and allows only the downward rotation of the hexagonal shaft (15) and the feeding belt (13) to the seedling feeding side is installed.

As shown in the figure, crank arms (20) are provided on both sides of the planting mission (1), which are rotatably driven in conjunction with the lateral feed of the seedling stand (4). When 4) reaches one stroke end of the lateral feed, the crank arm (20) moves the second arm (17b) of the first turning shaft (17).
I would like to tell you this from the bottom.
7), first arm (17a), rod (19), drive unit (18)
The hexagonal shaft (15) is driven to rotate by a set angle via the, and this rotational power is transmitted to the drive roller (9) via the vertical feed clutch (not shown), and the seedling is set by the feed belt (13). The mat-like seedlings (A) on the table (4) are sent downward (to the guide rail (3) side).

As shown in FIG. 1, a hydraulic cylinder (21) is attached downward to the stay (16) of the lower bracket (33), and an elongated hole (28) that engages with the tip of the arm (22). Or the action member (26) is attached to the piston rod (27) of the hydraulic cylinder (21) to move up and down.

The action member (26) descends due to the projecting operation of the piston rod (27), moves the arm (22) downward, and forcibly moves the seedling longitudinal feed mechanism (13) to the operating state. When the (27) is retracted upward and is not in operation, the movement of the arm (22) is not hindered by the action of the long hole (an example of accommodation) (28), and the seedling vertical feed mechanism ( It is possible to change the posture of 13).

As shown in FIG. 3, the operation valve (32) that controls the operation of the hydraulic cylinder (21) is wire-linked to the operation lever (30) that operates the planting clutch (29). When the operation lever (30) is operated on the entry side of the hydraulic cylinder (21), the hydraulic cylinder (21) is switched to the pushing operation state in conjunction with this.

That is, in addition to the switching lever (37), a return device (40) for forcibly returning the vertical feed mechanism (13) in the retracted posture to the working posture is provided, and the return device (40) is used as the rooting clutch (29). The return mechanism (40) and the switching lever (37) are connected to the longitudinal feed mechanism (1
The operation of the return device (40) is not transmitted to the vertical feed mechanism (13) when 3) is in the working posture, and the return device (40) operates only when the vertical feed mechanism (13) is in the retracted posture. Is transmitted to the forced return side, the return device (40) and the switching lever (37) are linked through a long hole (28) which allows mutual operation.

The return device (40) is a wire that links the hydraulic cylinder (21) to which the operating member (26) is connected, the operation valve (32), and the operation valve (32) with the operation lever (30) for opening and closing the rooted clutch. Etc.

Therefore, when the return device (40) is not in operation, the switching lever (3
The posture change operation of the vertical feed mechanism (13) by 7) can be freely performed.

As shown in FIG. 4, the crankshaft (47) of the transmission case (14) is provided with a brake mechanism (B) so that a dummy load is applied only during an angle during one rotation thereof. This brake mechanism (B) has a large load when the pull-up cam pulls up the push lever at the bottom dead center of the planting arm (2) when the crank shaft (47) reaches a certain rotation speed. (47) This is to prevent the drive torque curve from generating a noticeable peak value, which prevents it from rotating smoothly, causing hiccup rotation and causing the transmission case (14) to vibrate significantly. The push rod (50) urged by the spring (49) is applied to the cam (48) provided on the cam so that the raised portion (51) of the cam (48) and the push rod (50) come into contact with each other. The rotational load on the crankshaft (47) generated by the is set so as to act between the peak values of the drive torque curve. As a result, it is possible to suppress a sudden change in the torque curve, prevent the crankshaft from rotating as much as possible, and reduce the vibration of the transmission case, thereby contributing to the stabilization of the rooting posture of the seedlings.

To give a dummy load to the crankshaft (47),
As shown in FIG. 5, a load may be applied to the cam (53) of the crankshaft (47) by the leaf spring (52).

Further, as shown in FIG. 4, when a fly hole (54) is attached to the crank shaft (47) to increase the rotational inertial force of the crank shaft (47) itself, the torque curve is further smoothed. It is valid.

In this embodiment, the vertical feed mechanism (13) is provided with a priced clutch (2
Although the hydraulic cylinder (21) interlocking with the entry of 9) was used to return to the working posture, the movement of the operating member (30) can be mechanically directly moved by the wire etc. to the arm (22). It goes without saying that it is good.

It should be noted that reference numerals are given for convenience of contrast between the holes in the claims and the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the seedling stand structure of the rice transplanter according to the present invention. Fig. 1 is a vertical cross-sectional side view showing the case where the vertical feed mechanism is in the working posture, and Fig. 2 is the vertical feed mechanism in the retracted posture. FIG. 3 is a vertical sectional side view of the vicinity of the belt in a certain case, FIG. 3 is a circuit diagram showing a restoring device, FIGS. 4 and 5 are main part diagrams of a brake structure, FIG. [Fig. 3] is a horizontal cross-sectional view showing a lateral feed structure and the like of a seedling stand. (4) …… Seedling stand, (13) …… Vertical feed mechanism, (28)…
… Interchange, (29) …… planting clutch, (37) …… manual operation means, (40) …… return device.

Claims (1)

[Claims] 1. A seedling vertical feed mechanism (13), which can be switched between an acting posture in which the seedling placement base (4) moves upward from an opening of a seedling placement surface and a retracted posture in which the seedling placement surface is pulled downward, and the vertical feed mechanism. (1
3) is provided with an artificial manipulating means (37) capable of selectively switching between the acting posture and the retracting posture, and separately from the manipulating manipulating means (37), the vertical feeding mechanism ( A returning device (40) for forcibly returning the operation position 13) to the working posture is provided, and the returning device (40) is actuated to the forced returning side with the engagement of the rooting clutch (29) so that the planting clutch (29 ) Of the return device (40) and the manual operation means (37), the operation of the return device (40) is performed when the vertical feed mechanism (13) is in the working posture. The return device (13) is not transmitted to the vertical feed mechanism (13), and the operation of the return device (40) is transmitted to the forced return side only when the vertical feed mechanism (13) is in the retracted posture. 40) and the human-operated means (37) are linked through an interchange (28) that allows mutual operation. Seedling structure of rice transplanter.