JPH0534925B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a transmission device for a transplanter, and relates to a seedling supply table that reciprocates from side to side in a rice transplanter or a vegetable transplanter, and a seedling supply table from which the seedlings are transferred from the seedling supply table. This is related to a transmission device for a transplanter equipped with a transplant tool for dividing and transplanting.

[Prior art and problems to be solved by the invention]

Conventionally, a transplant has been provided with a seedling supply table reciprocating mechanism that receives power from the prime mover side to reciprocate the seedling supply table from side to side, and a transplant tool transmission mechanism that receives power from the prime mover side and operates the transplant tool. In the transmission device of the transplanter, the reciprocating mechanism of the seedling supply table is provided with an intermittent movement mechanism that stops the movement of the seedling supply table when the transplanting tool divides the seedlings placed on the seedling supply table. The transmission was damaged.

However, the above-mentioned conventional device has the advantage of being able to reliably divide seedlings because there is no movement of the seedling supply table when dividing seedlings with the transplanting tool, but as the transplanting speed is increased,
The repeated movement/stopping of the seedling supply stand becomes more frequent.
There was a problem in that the seedlings placed on the seedling supply stand were covered with small shocks, causing the seedbed to compress or collapse, making it impossible to supply seedlings appropriately.

Therefore, the same applicant installed an inconstant speed transmission mechanism in the reciprocating mechanism of the seedling feeding table, so that the seedling feeding table can move at a low speed without completely stopping the movement of the seedling feeding table when dividing the seedlings of the transplanting tool. An invention was made to reduce the shock to placed seedlings by moving them at non-uniform speed (Japanese Patent Application No. 52,671/1982).

By the way, in general transplanters, a variable speed transmission mechanism is interposed in the reciprocating mechanism of the seedling supply table to change the amount of movement of the seedling supply table relative to the operation of the transplanting tool, so that it can handle seedlings with different sowing conditions. It is becoming more and more popular. However, the device equipped with the inconstant speed transmission mechanism of the invention is not provided with this speed change transmission mechanism. This is because the meshing phases of non-uniform transmission gears such as eccentric gears and non-circular gears are fixed, so it is not enough to simply replace each transmission gear of the variable transmission mechanism with a non-uniform transmission gear. Because it was empty. In other words, if a transmission mechanism is provided with a plurality of pairs of non-uniform transmission gears, the meshing phase of each gear pair is determined, so the gear shifting operation is possible only in a very limited meshing state, and otherwise. This results in a state in which shifting becomes impossible, making the gear shifting operation extremely difficult. Therefore, it has been difficult to incorporate both an inconstant speed transmission mechanism and a variable speed transmission mechanism into the transmission device of a transplanter.

[Technical means to solve problems]

In order to solve the above problems, this invention
It includes a seedling supply table reciprocating mechanism that receives power from the prime mover 3 side to reciprocate the seedling supply table 5 from side to side, and a transplanter transmission mechanism that receives power from the prime mover 3 side and operates the transplanter 9. In the transmission device of the transplanter, on the transmission path of the reciprocating mechanism of the seedling supply table,
an inconstant velocity transmission mechanism A that moves the seedling supply table 5 at an inconstant speed so that the moving speed of the seedling supply table 5 becomes low when the transplanting tool 9 divides the seedlings placed on the seedling supply table 5; , a transmission device for a transplanter is provided in series with a variable speed transmission mechanism B that switches the average moving speed of the seedling supply table 5 in a plurality of stages.

[Operation and effect of the invention]

A transplanter 9 is placed on the transmission path of the reciprocating mechanism of the seedling supply table.
The seedling supply table 5 is arranged so that the moving speed of the seedling supply table 5 is slow when dividing the seedlings placed on the seedling supply table 5.
Since the inconstant speed transmission mechanism A that moves the seedlings at an inconstant speed and the variable speed transmission mechanism B that switches the average moving speed of the seedling supply table 5 in multiple stages are installed in series, the transplanting tool can operate in one cycle for planting one plant. On the other hand, when the transplanting tool divides the seedlings on the seedling supply table, the average movement speed can be changed while maintaining the seedling supply table moving at unequal speeds so that the movement speed of the seedling supply table becomes slow. It becomes like this.

Therefore, it is possible to reduce the amount of movement of seedlings during seedling division, allowing for accurate division of seedlings with less damage, and furthermore, even if the transplanting speed is increased, the shock to the seedlings placed on the seedling supply table can be kept small. The average moving amount of the seedling supply stand can be changed in response to seedlings with different sowing conditions without disturbing the placed seedlings.

〔Example〕

Reference numeral 1 denotes a transplanter, and the transplanter in this embodiment is attached to the rear of a walking towing vehicle body 2, and the power to the transplanter 1 is transmitted from a prime mover 3 attached to the towing vehicle body 2. It is configured.

The transplanting machine 1 has a transplant transmission case 4 as a base body, and a seedling supply table 5 is supported on the upper part of the case 4 by rails 6 and 7 so as to be able to reciprocate from side to side. A transplant tool 9 having a structure is attached via a crank 10 and a swinging rod 11. 12 indicates a leveling float.

To explain the transmission mechanism inside the transplanted transmission case 4,
Reference numeral 13 denotes a driven shaft which is transmitted from the prime mover on the side of the towing vehicle body 2, and in the case of the embodiment diagram, serves as an input shaft. This driven shaft 13 is provided so that one end thereof projects outside the transmission case 4, and an input pulley 14 is supported on this projecting end.

15 is a counter shaft, and this shaft 15 is rotatably installed within the transmission case 4. A pair of eccentric gears 16 and 17 is interposed between the counter shaft 15 and the driven shaft 13, and the eccentric gear 16 is wedged to the driven shaft 13 and rotates integrally with the driven shaft 13.
The eccentric gear 17 is provided so as to be freely attached to the counter shaft 15 and rotated freely.

Reference numeral 18 denotes a clutch for stopping at a fixed position, which includes a driving clutch piece 19 integrated with the eccentric gear 17, a driven clutch piece 20 wedged to the counter shaft 15 so as to be movable in the axial direction, and this driven clutch piece 20. It is made up of a spring 21 that presses the drive clutch piece 19 toward the side and a clutch pin 22 that moves the driven clutch piece 20 against the spring 21. Both clutch pieces 19 and 20 have engaging pawls 19a and 20a.
Further, the driven clutch piece 20 is provided with a cam surface 20b that receives rotational force and moves in a direction to press the spring 21 when the clutch pin 22 comes into contact with the driven clutch piece 20. That is, when the clutch pin 22 is pulled up, the driven clutch piece 20 is moved by the spring 21, and the engaging pawls 19a and 20a are engaged with each other, so that the counter shaft 1
5 is driven, and when the clutch pin 22 is pushed in, the pin 22 comes into contact with the cam surface 20b, receives rotational force, and the driven clutch piece 20 is pushed against the spring 21, so that the engagement of the claws is maintained at a certain position. When the counter shaft 15 comes off, the counter shaft 15 is always stopped at the same phase.

Reference numeral 23 denotes a lead cam shaft, and this shaft has a continuous groove in the left and right ends, and a lead pawl 25 attached to the lead metal 24 is engaged with this groove to fix the lead metal 24 to the shaft 26. This moving shaft 26 is protruded outward from the left and right of the transplant transmission case 4, and both ends thereof are connected to the seedling supply stand 5, and the lead cam shaft 23 is rotated. Then, the seedling supply table 5 is configured to reciprocate from side to side. A speed change transmission mechanism B is provided between the lead camshaft 23 and the countershaft 15. This speed change transmission mechanism B has three different numbers of teeth on the counter shaft 15 side.
Gears 27a, 27b, and 27c are arranged in a freely rotating state with key grooves formed in each one, and gears 28a, 28b, and 28c that mesh with these gears are wedged on the lead cam shaft 23 side. The tip of the sliding key 29 moving in the keyway bored in the transmission case 15 is elastically supported so as to change between a state of sinking into the keyway and a state of protruding. It is designed to be movable. 30 is a moving piece for attaching the sliding key 29; 31
is a spring, 32 is a shifter, 33 is an operating rod, 3
4 indicates an operating lever.

35 is a drive shaft for transmitting the transplant device;
A gear 36 is wedge-attached to the counter shaft 15, and a gear 37 is loosely attached to the lead cam shaft 23 that meshes with the gear 36.
Further, the power is transmitted by a gear 38 that meshes with this gear 37 and is wedged on the drive shaft 35.

A crank 10 for operating the implant 9 is transmitted from a sprocket 39 fixed to the drive shaft 35 via a chain 40 at a transmission ratio of 1:1. In addition, when the two transplanters alternately divide and transplant the seedlings, it is necessary to transmit the power at a deceleration ratio of 1/2.

Next, to explain the operation of the above example, when the driven shaft 13 is transmitted by the belt from the prime mover side, the counter shaft 15 is The loose driving clutch piece 19 is rotated by transmission, and the clutch pin 22 is pulled out and the cam surface 2 of the driven clutch piece 20 is rotated.
When removed from 0b, the engaging pawls 19a and 2 of both clutch pieces
0a is engaged and the counter shaft 15 is rotated by transmission. At this time, the rotation of the counter shaft 15 does not rotate smoothly, but rotates while becoming faster and slower during one rotation.

Then, from the counter shaft 15, the gears 36, 3
A drive shaft 35 is transmitted and rotated through the shafts 7 and 38, and from this drive shaft 35 a sprocket 39 and a chain 40 are
The rotating shaft of the crank 10, which operates the transplant tool 9, is transmitted through the shaft, and the transplant claw 8 of the transplant tool operates while drawing a transplant locus A. Then, the transplanting claws 8 divide and clamp one seedling at a time from the side of the seedling supply stand 5 and transplant it to the soil surface of the plant.

At this time, since the counter shaft 15 is transmitted and rotated by the eccentric gears 16 and 17 as the inconstant speed transmission mechanism A, the operating speed of the crank 10 also fluctuates, and when it is time to transplant the seedlings to the soil surface. Because it is set at a high speed, the time from when the transplant claws 8 enter the soil surface to when they are pulled up is shortened, which eliminates the need to enlarge the hole at the transplant site, and prevents the transplanted seedlings from lodging or from deep-water fields. It can be transplanted accurately without any problems such as surfacing when it is.

On the other hand, from the counter shaft 15 to the lead cam shaft 23
The transmission is selectively performed at one of high speed, medium speed, and low speed via the variable speed transmission mechanism B, and the seedling supply table 5 is reciprocated from side to side via the lead metal 24. At this time, the eccentric gear 16 as the inconstant velocity transmission mechanism A,
Since the counter shaft 15 is rotated by transmission at 17, the reciprocating speed of the seedling supply table 5 from side to side is not constant, but may move quickly or slowly. However, the average moving speed at which the lead metal 24 moves from one side end to the other side of the lead camshaft 23 does not change.
By the rotation of the lead cam shaft 23,
The seedling supply table 5 reciprocates left and right to supply seedlings one by one to the transplant claws 8, but since the speed of movement of the seedling supply table 5 is set to be slow at the time of seedling division, seedling division is ensured. become.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a side view, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view showing the transmission mechanism, and Fig. 4 is a side view of the main part. FIG. In the figure, the symbols 3 are the prime mover, 5 is the seedling supply table, 9 is the transplanting tool, A is the non-uniform speed transmission mechanism, and B is the variable speed transmission mechanism.

Claims (1)

[Claims] 1 A seedling supply table reciprocating mechanism that receives power from the prime mover 3 side to reciprocate the seedling supply table 5 from side to side, and a transplanter transmission mechanism that receives power from the prime mover 3 side and operates the transplanter 9. In the transmission device of the transplanter equipped with the above, on the transmission path of the reciprocating mechanism of the seedling supply table, the moving speed of the seedling supply table 5 is set when the transplant tool 9 divides the seedlings placed on the seedling supply table 5. It is characterized by providing in series an inconstant speed transmission mechanism A that moves the seedling supply table 5 at an inconstant speed so that the seedling supply table 5 is at a low speed, and a variable speed transmission mechanism B that switches the average moving speed of the seedling supply table 5 in multiple stages. A transmission device for a transplanter.