JPH0434654Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a seedling feeder that rotates while engaging with the seedlings placed on the seedling tray to feed the seedlings to the seedling take-out section. A tool is attached to the seedling tray, and a friction type brake for stopping the seedling feeder from rotating is provided, and a drive lever is provided that swings back and forth around the rotation axis of the seedling feeder, and the drive lever and the seedling feeder are connected to each other. Between the shaft of the feeder and the shaft, the seedling feeder is wound and fixed around the shaft so as to rotate the seedling feeder in the seedling feeding direction against rotational rotation by the brake by forward swinging of the drive lever, and rotates integrally with the shaft. And, due to the back-swinging of the drive lever,
This invention relates to a seedling feeding mechanism for a seedling planting device that is equipped with an interlocking coil spring that unwinds from the shaft and rotates independently in reverse.

[Conventional technology]

In the conventional seedling feeding mechanism of this type of seedling planting device, as shown in FIG.
4A was configured to have the same diameter over its entire length in the axial direction.

[Problem that the invention attempts to solve]

However, when using the seedling feeding mechanism of the conventional seedling planting device, the coil spring is wound around the interlocking shaft portion over its entire length, so the length of the coil spring is lengthened to reduce the amount of elastic deformation of each part of the coil spring. If the durability of the coil spring is improved by reducing the coil spring, the interlocking shaft portion becomes longer and the contact area between the coil spring and the interlocking shaft portion becomes larger. As a result, if the coefficient of friction between the contact surfaces becomes large due to rust on the coil springs or interlocking shafts or mud adhering to them,
Even if the increase in frictional force at each part is small, when viewed as a whole, the frictional force becomes very large. The winding diameter becomes larger. Therefore, when the drive arm swings backward, the timing at which the frictional force between the coil spring and the interlocking shaft portion decreases to a value that allows the coil spring to rotate independently in reverse is delayed, and the seedling feeder is driven to rotate significantly in reverse. The placed seedlings may be returned by rotating in the opposite direction,
Alternatively, a failure in feeding the seedlings occurs when the engagement portion of the placed seedlings with the seedling feeder is damaged and a slip occurs during the next feeding of the seedlings.

The purpose of the present invention is to improve the durability of the coil spring while suppressing a reduction in the seedling feeding effect due to rust on the coil spring or interlocking shaft, or mud adhering to them.

[Means for solving problems]

A characteristic feature of the seedling feeding mechanism of the seedling planting device according to the present invention is that a small diameter portion that does not come into contact with the coil spring is formed in the interlocking shaft portion of the shaft around which the coil spring is wound. The effects and effects thereof are as follows.

[Effect]

Since the interlocking shaft part has a small diameter part that does not come into contact with the coil spring that is wound and fixed around it, the contact surface between the coil spring and the interlocking shaft part, that is, the friction interlocking surface, is small compared to the length of the coil spring. can be made smaller. Therefore, even if the friction coefficient of the friction interlocking surfaces between the two becomes large due to rust on the interlocking shaft or coil spring, or mud adhering to them, the overall increase in frictional force is reduced compared to conventional methods. can. Therefore, by appropriately setting the width of the small diameter portion based on the rotation prevention force of the brake, etc., it is possible to maintain the coil in its initial state without rust on the interlocking shaft portion or coil spring, or with mud adhering to them. Although the frictional interlock between the spring and the interlocking shaft is ensured, the coil spring and the interlocking shaft may become rusty or
Alternatively, by adhesion of mud to them, it is possible to suppress a delay in the individual reverse rotation timing of the coil spring when the drive lever swings back and forth.

[Effect of idea]

Therefore, according to the present invention, it is possible to reduce the reverse rotation of the seedling feeder when the drive lever swings back and forth, regardless of rust on the interlocking shaft portion or coil spring, or mud adhering to them. It has become possible to prevent the placed seedlings from returning and damage to the placed seedlings, and to effectively transmit the desired seedling feeding action.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

The seedling feeding mechanism of the seedling device in a walk-behind rice transplanter is a walk-behind rice transplanter, as shown in FIG. A planting device 4 and a control handle 5 are attached, and a float 6 for leveling the ground is attached to the body frame 2 so as to be swingable up and down with the rear end side as a fulcrum R.

The tip of the float 6 and the fuselage frame 2 are connected by a link 7, and as shown in FIG. 8, the insertion hole 9 of the link 7 for the pivot pin 8 on the fuselage frame 2 side The hole is formed into a long hole that allows vertical movement within a set range. In addition, a marker 11 that indicates the aircraft's course using the approximately planted seedlings as an indicator is pivotally supported on the pivot pin 10 on the float 6 side with respect to the link 7. An engagement for fixing the float that can be freely engaged with and disengaged from the pivot pin 8 on the body frame 2 side by swinging around the pivot pin 10 of the float 6, and prevents the float 6 from swinging up and down. A portion 12 is formed.
Furthermore, as shown in FIG. 9, the proximal end of the shaft portion 11A is inserted into the bracket 13 for attaching the pivot pin on the float 6 side, and the marker 11 is attached to the pivot pin on the fuselage frame 2 side. 8, and a cam surface 15 that holds the marker 11 in an engaged position by bringing the proximal end of the shaft into elastic contact with the elasticity of the shaft 11A itself.

The seedling planting device 4 includes a seedling platform 1 in a rearward tilted position that is reciprocated laterally with a set stroke.
6, a planting claw 17 that is rotated up and down in conjunction with the movement of the seedling platform 16, and the seedling platform 1.
6 is located at the end of the movement stroke, the seedling feeding mechanism 19 is operated to feed the placed seedling A to the side of the seedling take-out section 18 by the planting claw 17.

As shown in FIG. 5, the mechanism for moving the seedling stand 16 is to attach a screw shaft 20 in a horizontal position that rotates in one direction to the body frame 2 in a fixed position, and to attach a screw shaft 20 formed on the screw shaft 20 in a fixed position. It is constructed by attaching to the seedling stand 16 a top member 21 that engages with the spiral groove 20a and is reciprocated in the lateral direction by the rotation of the screw shaft 20.

As shown in FIGS. 5 and 6, the seedling feeding mechanism 19 rotates around the horizontal axis X while engaging the seedlings A through holes 22 formed in the seedling table 16. A plurality of seedling feeders 23 for sending out the placed seedlings A to the seedling take-out section 18 side are attached to the seedling tray 16 while sharing their shafts 24, and the seedling feeders act on the shafts 24. 23, and an interlocking mechanism that rotates the shaft 24 using the screw shaft 20 as a drive shaft.

As shown in FIGS. 1 to 4, in the interlocking mechanism, arms 26 are fixed to both ends of the screw shaft 20, and the seedling stand 16 is positioned at the end of the movement stroke on the shaft 24. When this happens, the drive lever 28 which is kicked by the corresponding one of the arms 26 and swings back and forth around the shaft 24 against the biasing force of the spring 27 is supported, and the drive lever 28 swings back and forth once. A clutch 29 is provided for rotating the shaft 24, that is, the seedling feeder 23 by a fixed amount in the seedling feeding direction.

The clutch 29 is located between the drive lever 28 and the shaft 24, has one end fixed to the drive lever 28, and the other end elastically in contact with the circumferential portion of the shaft 24. , the seedling feeder 23 is wound and fixed around the shaft 24 so as to rotate in the seedling feeding direction against rotation by the brake 25, and rotates integrally with the shaft 24, and when the drive lever 28 swings back and forth, , an interlocking coil spring 3 that unwinds from the shaft 24 and independently rotates in reverse.
It is configured by providing 0. More specifically, as shown in FIGS. 3A and 3B, as the drive lever 28 swings forward from the standby position P ₁ to the intermediate position P ₂ , the other end of the coil spring 30 touches the shaft peripheral surface. Because it is in elastic contact with the shaft 24 and is prevented from rotating by frictional force, it is deformed in diameter and wrapped around the shaft 24 and fixed, and the drive lever 28 is moved from the intermediate position P ₂ to the swing return position P ₃ . The forward swing causes the shaft 24 to rotate while being wound and fixed on the shaft 24, and the fourth
As shown in Figures A and B, as the drive lever 28 swings back and forth from the swing return position P ₃ to the intermediate position P ₄ , it is unwound (in other words, expanded in diameter) and attached to the shaft 24. Release the winding and move the drive lever 28 to the halfway position.
As it swings back from _P4 to standby position _P1 , it independently rotates backwards and returns to its original state.

And, of the shaft 24, the coil spring 3
The interlocking shaft portion 24A around which 0 is wound is constituted by a cylinder 31 which is fixed to the shaft 24 so as not to rotate, and the interlocking shaft portion 24A is formed with a small diameter portion 24a that does not come into contact with the coil spring 30 which has been deformed in diameter. has been done.

According to the above embodiment, since the small diameter portion 24a is formed on the interlocking shaft portion 24A, the coil spring 30 is short in length.
Therefore, the contact surface between the coil spring 30 and the interlocking shaft portion 24A, i.e., the friction interlocking surface, can be reduced.
0. Due to the adhesion of mud to the interlocking shaft portion 24A,
When the friction coefficient of the friction interlocking surface becomes large, the overall friction interlocking force between the coil spring 30 and the interlocking shaft portion 24A is not as large as when the entire circumferential surface of the interlocking shaft portion 24A is made into a friction interlocking surface. Therefore, even if the friction coefficient of the friction interlocking surface becomes large,
The intermediate position _P4 where the frictional interlock is released as the drive lever 28 swings back, does not shift significantly toward the standby position _P1 .

[Another example]

Next, another embodiment of the present invention will be shown.

As shown in FIG. 10, the interlocking shaft portion 24A
The first cylinder 31a is attached to the shaft 24 in a non-rotating state.
and a second tube that can freely adjust the amount of insertion of its small diameter portion into the first tube 31a by moving in the axial direction relative to this.
The small-diameter portion 24a is formed by a small-diameter portion of the second tube 31b that is not inserted into the first tube 31a. in this case,
By moving the second cylinder 31b, the width of the small diameter portion 24a in the axial direction can be adjusted.

[Brief explanation of the drawing]

1 to 9 show an embodiment of the seedling feeding mechanism of the seedling planting device according to the present invention, FIGS. 1 and 2 are longitudinal sectional front views of main parts showing the operation, and FIGS.
Figures 4A and 4B are longitudinal sectional side views of the main parts showing the operation, Fig. 5 is a cross-sectional plan view of the main parts, Fig. 6 is a longitudinal sectional side view of the main parts, and Fig. 7 is a side view of the rice transplanter. FIG. 8 is a side view of the main part, FIG. 9 is a plan view of the main part, and FIG. 10 is a longitudinal sectional front view of the main part showing another embodiment. 1st
FIG. 1 is a longitudinal sectional front view of main parts showing a conventional example. 16... Seedling stand, A... Placed seedlings, 18... Seedling take-out section, 23... Seedling feeder, 25... Brake, 28... Drive lever, 24... Shaft, 30...
Coil spring, 24A... Interlocking shaft part, 24
a...Small diameter part.

Claims (1)

[Scope of utility model registration request] By rotating while engaging with the placed seedling A on the seedling table 16, the placed seedling A is transferred to the seedling take-out section 18.
A seedling feeder 23 that sends out the seedling feeder 23 to the side is attached to the seedling stand 16, and a friction type brake 25 is provided to stop the seedling feeder 23 from rotating. A drive lever 28 is provided between the drive lever 28 and the shaft 24 of the seedling feeder 23, and by swinging the drive lever 28 forward and backward, the seedling feeder 23 is moved against rotation by the brake 25 and the seedlings are moved. An interlocking mechanism that is wound and fixed around the shaft 24 so as to rotate in the feeding direction and rotates together with the shaft 24, and when the drive lever 28 swings back and forth, the winding around the shaft 24 is released and the shaft 24 is independently rotated in reverse. Coil spring 3 for
In the seedling feeding mechanism of the seedling planting device provided with 0, the coil spring 2 of the shaft 24
A seedling feeding mechanism for a seedling planting device in which a small diameter portion 24a that does not come into contact with the coil spring 28 is formed on an interlocking shaft portion 24A around which a coil spring 8 is wound.