JPH03183407A - Seedling transplanter - Google Patents

Abstract

PURPOSE:To prevent breakage of transmission chain by transmitting power transmitted to a transmission shaft to a planting pawl by a transmission chain and transmitting the power through a cam mechanism and engaging link to a retaining arm. CONSTITUTION:Power transmitted to transmission shaft 21 is transmitted through a transmission chain 25 to a planting pawl 3a and transmitted through a cam mechanism 28 and engaging link 30 provided to a transmission shaft 21 to a retaining arm 6. The retaining arm 6 is driven to retaining position side thrusting into top seedling A previous to planting operation of planting pawl 3a. Thereby the load on the transmission chain can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a seedling transplanter for planting, for example, rush, rye, etc. seedlings in a field.

[Conventional technology]

For example, in a rice seedling transplanter for rush grass, like a normal rice transplanter, there is a seedling tray on which the seedlings are placed, and the seedling tray is linked to the reciprocating horizontal feed drive of this seedling tray. The planting claw is rotated in a circular manner to take out the seedlings on the seedling stand and plant them in the field. When the seedling stand reaches the end of its horizontal feed stroke, the seedlings on the seedling stand are sent to the seedling take-out port side. Some have a structure equipped with a vertical feed mechanism.

In the case of the above structure, when the seedlings are sent to the seedling take-out port side by the vertical feed mechanism, the seedlings may float up near the seedling take-out port, and the planting claw may not be able to take out a single seedling accurately. be. In addition, the planting claws usually hold the stem above the root of the seedling, but if the seedling lifts up, they will hold the root, so for crops such as rush, where new shoots grow near the root, , the planting nails may damage the new buds.

Therefore, a holding arm that forcibly moves and holds the first seedling near the seedling take-out port is provided separately from the planting claw, and this holding arm is placed in advance of the planting operation of the planting claw, allowing the seedling to float up. A structure has been proposed in which the seedlings are pushed down to a predetermined position (see Japanese Patent Application No. 1-219366).

[Problem to be solved by the invention]

In the above configuration, power is transmitted to the planting claw (member (6) of the above application) from the transmission shaft in the feed case (member (3) of the above application) located in front of the planting section via the transmission chain. Power is transmitted to the drive shaft (member (14) of the above application).The cam plate (member (15) of the above application) fixed to this drive shaft connects the holding arm (member (22) of the above application). , (23)) are reciprocated back and forth.

Therefore, since both the driving load of the planting claws and the driving load of the holding arm are applied to the transmission chain, there is a risk that the transmission chain will stretch and break if used for a long period of time.

Here, an object of the present invention is to prevent damage to a transmission chain in a seedling transplanter.

[Means to solve the problem]

A feature of the present invention is that the seedling transplanter in which power is transmitted from the transmission shaft to the planting claws via the transmission chain as described above is structured as follows. In other words, the holding arm that forcibly moves the leading seedling near the seedling take-out port to the seedling take-out port and holds it is supported so as to be movable back and forth between a holding position for pushing into the leading seedling and a retreating position away from the seedling. With,
An interlocking link is constructed across the cam mechanism provided on the transmission shaft on the upper side of the transmission and the holding arm, and the holding arm is driven by the cam mechanism to the plunge holding position side prior to the planting operation of the planting claw. The functions and effects are as follows.

[For production]

With the configuration described above, the power transmitted to the transmission shaft is transmitted to the planting claw via the transmission chain, and the cam mechanism and the cam mechanism provided on the transmission shaft are transmitted to the holding arm without the transmission chain. It is transmitted via linkage.

As a result, in the conventional structure, the driving load of both the planting claw and the holding arm is applied to the transmission chain, whereas in the present invention, only the driving load of the planting claw is applied to the transmission chain.

〔Effect of the invention〕

As described above, a structure that can reduce the load on the transmission chain by avoiding concentration of the load on the transmission chain is obtained, and the durability of the transmission chain and the durability of the entire seedling transplanter are improved. We were able to achieve this goal.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows the overall side view of the rice seedling transplanter, in which a crank arm (2) that is rotatably driven at the rear of a planting mission case (1) is equipped with a planting claw (3a). The arm (3) is attached and the planting mission case (1)
A holding arm (6) is attached to a pair of front and rear links (4) and (5) provided at the top of the. A seedling stand (8) is provided that is driven to slide back and forth along a guide rail (7) fixed to the top surface of the planting mission case (1), and a seedling stand (8) is mounted on a float at the bottom of the planting mission case (1). (13) is supported to constitute a rice grass seedling transplanter.

With the above structure, the seedling stand (8) is connected to the guide rail (7).
), and while the seedling stand (8) is stopped, the planting nails (3a
) passes through the seedling take-out port (12>) of the guide rail (7), takes out the seedling (A), and plants it in the field (G).

As shown in Figure 6, for the strawberry seedlings (A) to be placed on the seedling stand (8), two sets of small partition plates (10) are placed between the left and right large partition plates (9). The left and right partition plates (9) are placed on the partition part (8a) of the seedling stand (8).

On the other hand, when the seedling stand (8) reaches the stroke end of the reciprocating slide, the seedling (A) is guided downward as shown in Figures 1 and 5.6. Rail (7
) side is provided with a belt-type vertical feeding mechanism (11). At the bottom of the seedling stand (8), while lifting and guiding the roots of the seedlings (A) sent by the vertical feed mechanism (11), the planting claws (3a) divide the roots into the number of plants to be taken out. A plate (14) is fixed. This root is a plate (
14) is a thin plate type with a triangular shape when viewed from the side, and the rear portion is curved upward. As shown in Fig. 5, the roots of these plates (14) are arranged at the same pitch as the width of the seedling outlet (12), and the setting stroke for intermittent feeding of the seedling table (8) is also arranged. The roots are made to match the pitch of the plates (14) and the width of the seedling outlet (12).

To explain further, as shown in FIGS. 1 and 5, a freely rotatable pulley (15) is arranged on the guide rail (7) so as to sandwich the seedling outlet (12). ) is wound with a rubber belt (16) with protrusions. As a result, when the seedling stand (8) is sent along the guide rail (7), the frontmost part of the seedling (A) rests on the rubber belt (16) and is attached to the seedling stand (8) without collapsing. This means that the information will be sent to

Next, the drive structure of the holding arm (6> and planting arm (3)) will be explained.As shown in FIGS. 2 and 3,
Power from the engine (not shown) is transmitted to the first transmission shaft (18) in the planting mission case (1) via the PTO shaft (17). Then, the first gear (19) and the second gear (2
The power is transmitted to the second transmission shaft (21) via the second power transmission shaft (21).

On the other hand, the crank arm for the planting arm (3) (
A sprocket gear (23) is fixed to a drive shaft (22) having a sprocket gear (24) fixed to a second transmission shaft (21) and a sprocket gear (24) of a drive shaft (22). 23) and the transmission chain (2
5) is wound. As mentioned above, the planting arm (3
) is transmitted via the second transmission shaft (21) and the transmission chain (25).

To explain further, a third gear (26) is provided at a plurality of locations on the second transmission shaft (21).
) is engaged with the fourth gear (27), and the first cam part (28)
(corresponding to a cam mechanism) is provided. On the other hand, there is a swingable operation arm (29) near the fourth gear (27).
is attached, and an interlocking link (30) extends between the operating arm (29) and the link (4) of the holding arm (6).
has been erected. The link (4) is provided with a spring (31) that biases the holding arm (6) toward the retracted position away from the seedling (A). Further, the length of the link (30) can be adjusted using a turnbuckle (30a).

Next, the movements of the planting arm (3) and the holding arm (6) will be explained. In Figure 1, the planting arm (3) is the seedling (A).
This is the state before the seedling (A) is taken out, and the holding arm (6) is in a retracted position away from the seedling (A) due to the biasing force of the spring (31). Then, as shown in Fig. 2, the second transmission shaft (21) rotates counterclockwise, and the planting claw (3a) at the tip of the planting arm (3) reaches in front of the seedling removal port (12). Then, the first cam part (28) of the fourth gear (27) comes into contact with the second cam part (32) of the operating arm (29) and pushes it down.

This allows the holding arm (
6) moves to the left on the paper, rushes into the seedling (A), and pushes down the leading seedling (A). And the planting arm (3
)'s planting claw (3a) passes through the seedling removal port (12), and -
A seedling (A) of the stock is taken out by the planting claw (3a).

Then, when the drive shaft (22>) further rotates, the seedling (A) is planted in the field (G), and the first cam part (28) is separated from the second cam part (32), and the spring (31) is attached. The force causes the holding arm (6) to return to the retracted position away from the seedling (A).

Next, the transmission structure to the seedling stand (8) will be explained.

As shown in FIG. 3, the power of the first transmission shaft (18) is transmitted to the helical shaft (34) via an intermittent gear transmission mechanism (33). A transverse feed shaft (35) is supported to be slidable left and right with respect to the planting mission case (1), and both left and right ends of the transverse feed shaft (35) are connected to the back surface of the seedling stand (8). ing. Further, a retaining member (36) fixed to the middle of the traverse feed shaft (35) is engaged in the endless helical groove (34a) of the helical shaft (34).

With the above structure, the continuous rotational power of the first transmission shaft (18) is converted into intermittent rotational power by the intermittent gear transmission mechanism (33>) and transmitted to the helical shaft (34). The horizontal feed shaft (35) and the seedling stand (8) are connected to the spiral shaft (
34), the seedlings are intermittently fed at a set stroke (the root portion corresponds to the pitch of the board (14) and the width of the seedling outlet (12)).

Next, the intermittent gear transmission mechanism (33) will be explained. As shown in FIG. 4, this consists of a drive gear (37) on the first transmission shaft (18) side with partial gear teeth (37a) and a convex cam (37b), and a helical gear with a concave cam (38b). Axis (34
) side passive gear (38), and the number of teeth of the partial gear teeth (37a) of the drive gear (37) is matched with the number of teeth of the gear teeth (38a) of the passive gear (38). There is. As a result, the state in which the passive gear (38) rotates once and the state in which it stops at the set phase alternately appear, and the helical shaft (38
4) is rotated intermittently.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the seedling transplanter according to the present invention, and FIG. 1 is an overall side view of the seedling transplanter, and FIG. 2 shows a state in which the holding arm and the planting claw have entered the germ from the state shown in FIG. 1. Fig. 3 is a schematic plan view showing the transmission structure to the planting arm, holding arm, and seedling stand; Fig. 4 is a side view of the intermittent gear mechanism for transmitting power to the seedling stand; FIG. 5 is a plan view of the vicinity of the seedling take-out port in the seedling stand, and FIG. 6 is a perspective view showing the state in which the seedlings are placed on the seedling stand. (3a)... Planting claw, (6)... Holding arm, (8)... Seedling stand, (11>...
... Vertical feed mechanism, (12) ... Seedling take-out port,
(21)...Transmission shaft, (25)...Transmission chain, (28)...Cam mechanism, (30)...Linkage mechanism, (A )...Seedlings, (G)...Field.

Claims (1)

[Claims] A seedling tray (8) that is driven to reciprocate from side to side while placing crop seedlings (A), and a seedling take-out port are operated by the power transmitted from the transmission shaft (21) via the transmission chain (25). A planting claw (3a) is driven to circulate and rotate so as to take out the seedlings (A) from the seedling rack (8) from the seedling rack (12) and plant them in the field (G), and the seedling rack (8) is placed horizontally. The seedling transplanter is equipped with a vertical feed mechanism (11) that sends the seedlings (A) on the seedling stand (8) toward the seedling take-out port (12) when the feeding stroke end is reached. The holding arm (6), which forcibly moves and holds the leading seedling (A) near the opening (12) to the seedling take-out port (12), is moved to the holding position where it enters the leading seedling (A) and from the seedling (A). A link (30) is installed between the cam mechanism (28) provided on the transmission shaft (21) and the holding arm (6), while supporting the reciprocating movement between the transmission shaft (21) and the holding arm (6). Prior to the planting operation of the planting claw (3a), the holding arm (6) engages the cam mechanism (28).
A seedling transplanter configured to be driven to the plunge holding position side by.