JPS5863308A - Power transmission of seedling planting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission device for a seedling planting device provided in a rice transplanter.

The seedling planting device of the rice transplanter includes a seedling tank that reciprocates from side to side with the rotation of the lead cam shaft due to the function of the engaging pawl that engages with a spiral groove provided on the outer periphery of the lead cam shaft, and the seedling tank and the top of the tank. It is equipped with a planting rod that divides and takes out the seedlings placed in the field and plants them in the field, and a seedling feeding device that sends the seedlings on the seedling tank to the side from which the seedlings are taken out at the end of the movement path of the seedling tank. Seedling planting devices are known. In such a device.

The drive shaft that drives the planting rod and the lead cam shaft that moves the seedling tank are connected by a chain gear and a power transmission means such as a chain, so that the amount of lateral movement of the seedling tank for one cycle of movement of the planting rod is a constant ratio ( (usually one seedling). In addition, seedlings on a seedling tank are normally planted sequentially starting from the bottom row, but when the seedling tank reaches the end of its horizontal transfer process, the bottom row of seedlings has just been removed. At this time, the seedling feeding device is generally operated to send out the seedlings held in the upper part to a position on the side from which the seedlings are taken out.

By the way, with such a seedling planting device, it is necessary to appropriately increase or decrease the amount of horizontal feed of the seedling tank relative to the movement of the planting rod depending on the growth condition and variety of the seedlings. Since each movement of the feed device had to be readjusted to an appropriate relationship, a great deal of effort was required to adjust the amount of lateral feed. Furthermore, since it is necessary to replace the sprocket wheels and gears in order to adjust the above-mentioned lateral feed amount, the seal structure of the power transmission device, etc. has become complicated.

The present invention was made in view of the above circumstances, and provides a power transmission device for a seedling planting device that has a simple structure and allows easy adjustment of the amount of lateral feed of the seedling tank. This will be explained below.

The power transmission device according to the present invention connects in parallel a plurality of driven gears with different gear ratios, which are always connected to a drive gear fitted to a drive shaft for a planting rod, and which are rotatably loosely fitted to the lead cam shaft. In addition, gear fixing means is provided that can selectively fix the plurality of driven gears to the lead camshaft while maintaining a constant positional relationship with respect to the lead camshaft. Embodiments of the present invention shown in the drawings will be specifically described below. .

FIG. 1 is a side view of a walking rice transplanter to which the present invention is applied.
This rice transplanter is equipped with a prime mover 2 at the front end of the machine body l,
The prime mover 2 has a gear box 3 protruding from the rear of the prime mover.
A hydraulic pump 5 for operating the hydraulic cylinder 4 is connected to the hydraulic pump 5 . A chain case 6 serving as a rotating arm is pivotally supported on the body 1 by a shaft 6a, and a running wheel 7 is attached to the rear end of the chain case 6. Rotational driving force is transmitted to the running wheels 7 from the prime mover 2 via a gear train in the gear box 3 and a chain in the chain case 6 . An arm 8 is provided at the front end of the chain case 6, and the front end of a rod 9 is pivotally attached to the arm 8. The rear end of the rod 9 is connected to a take-up rod 10, and a piston '11 of the hydraulic cylinder 4 is connected to the take-up rod 10. The chain case '6 and the running wheels 7 are provided in pairs on both the left and right sides of the machine body.

A pair of left and right floats 12 are provided on the sides of the machine body outside the running wheels 7, and a seedling planting device 1a is provided at the rear of the machine body 1. The float 12 has its rear end pivotally connected (A) to the seedling planting device 1a, and its front end connected to a connecting member 14 that passes through a space 13 formed between the prime mover 2 and the gear box 3 from side to side. There is. The connecting member connecting the left and right floats 12 is connected at its center to the hydraulic valve 18 via a vertical rod 159, a rotating piece 16, and a horizontal rod 17. During use, when the plowing platform becomes deeper and the ground pressure of the float 12 increases, the front part of the float 12 rotates upward with respect to the machine body, switches the hydraulic valve 18, and closes the piston of the hydraulic cylinder 4. 11 is extended to lower the traveling wheels 7. Conversely, when the plowing platform becomes shallow and the ground pressure of the float 12 decreases, the traveling wheels 7 are pulled up. A fuel tank 19 is provided at the top of the aircraft body, and a balance weight 20 is provided at the front end of the aircraft body.

The seedling planting device 1a includes a seedling tank 22 that is provided so as to be movable left and right along a control handle 21, and a seedling planting device that divides the seedlings placed on the seedling tank 22, takes them out, and plants them in a field. Rods 23, 23', 23" 23M, seedling tank 22
It is comprised of a seedling feeding device 24 that feeds the seedlings on the seedling tank downward at the end of the moving stroke, a power transmission device for driving these, and the like. A planting section mission case 25 is provided at the front of the planting device 1a, and transmission cases 26.degree. 26' are provided at both ends of the planting section mission case 25. Planting department mission case 25
A main shaft 27 having chain gears 31 and 31' at both ends is housed inside the main shaft 27, and the rotational driving force taken out from the gear train in the gear box 3 is transmitted to the work machine output shaft 2.
8. It is transmitted to this main shaft 27 via bevel gears 29, 29' and a clutch 30. In addition, the conduction case 26
．． Cylindrical portions 26a and 26a' are provided in the intermediate portions of 26', respectively, and planting rods 23.23', 23", 2
Drive shafts 32 and 32' for driving the drive shafts 3# are housed. This drive shaft 32° 32' has transmission gears 37, 37
' and a drive gear 38°38' are attached.

A lead cam shaft 33 is located at the rear end of the transmission case 26, 26'.
is provided parallel to the drive shaft 32°32'. The lead camshaft 33 has a spiral groove 34 formed on its outer periphery, and driven gears 35', 35' and drive arms 36, 36' are provided at both ends, respectively. Main shaft 2 above
The chain gears 31, 31' of 7 and the transmission gears 37, 37' of drive shafts 32, 32' are connected to chains 39, 3, respectively.
9', the driving gear 38° 38' of the drive shaft 3, 2.32' and the driven gear 35 of the lead camshaft 33,
35' are connected by chains 40 and 40'.

Instead of using chains 40, 40', they may be connected by a gear train, but chains are used.

It is more convenient. The driven gears 35 and 35' on both sides of the lead camshaft 33 are loosely fitted to the lead camshaft 33 so as to be freely rotatable.
The numbers of teeth 35' are different from each other, and as shown in FIG. 3, one of the driven gears can be selectively fixed to the lead camshaft 33 using a key 41. , the lead camshaft 33 and the driven gear 35 (
35') is fixed.

This is done by inserting the key 41 into a single keyway 33a provided in the lead camshaft 33, so that the circumferential positional relationship of the fixed driven gear with respect to the lead camshaft is always kept constant. During use of this rice transplanter, rotational power is transmitted to the lead camshaft through one of the driven gears fixed in a fixed positional relationship with respect to the lead camshaft 33, and the other driven gear is connected to the drive gear. When the cod is in the "married position", the rotation of the camshaft 33 is idled. 1゛ □ The engagement claw 43 of the lead metal 42 attached to the back surface of the seedling tank 22 engages with the spiral groove 34 of the lead cam shaft 33, and the rotation of the lead cam shaft 330 causes the seedling tank 22 to reciprocate from side to side. It is designed to let you do so. lead metal 4
A telescopic cover 44 that covers the one-node camshaft 33 is provided on both sides of the camshaft 20 .

Alternatively, the driven gears 35 and 38' may have the same number of teeth, and the driving gears 38 and 38' may have different numbers of teeth. Further, both pairs of the driving gear and the driven gear may be housed in one of the transmission cases, or two or more such pairs may be provided.

Next, FIG. 4 is a side view of the seedling feeding device 24, in which the seedling tank 22 supported on the seedling flower tray 22b has a
A support shaft 47 whose both ends are supported by the seedling tank is provided. A plurality of windmills 46 for feeding seedlings are attached in parallel at regular intervals in the middle of the support shaft 47, and ratchet wheels 51 are fixed to both ends. A locking arm 48 having a mating engagement piece 50 is loosely fitted integrally with a rotating lever 49. The rotation lever 49 is normally pulled down by a spring 52, but the rotation lever 49 is
When reaches the end of its travel with the supporting shaft,
It is pushed up by a certain amount by the drive arms 36 and 36' which are constantly rotating together with the lead cam shaft 33,
The support shaft 47 and the windmill 46 attached thereto are rotated by a certain amount in the direction of the arrow through the engagement of the retaining piece 5o and the ratchet wheel 51. At the position where the windmill 46 is installed, the bottom of the seedling tank 22 is cut out to form a feeding window 22, and the claws 46a of the windmill 46 protrude inward from this window 22a to feed the seedling mat 53. Since it is biting in, when the windmill 46 rotates, the seedling mat 53
A certain amount is sent to the seedling extraction side (facing downward). Therefore, timing the windmill 46 to rotate by a predetermined amount when the seedling tank 22 reaches the end of its travel is extremely important for proper planting.

In the power transmission device according to the present invention, a plurality of driven gears having different gear ratios are provided in parallel to transmit rotational power to the lead camshaft, and these driven gears are provided on a drive shaft for a permanent planting rod. In addition to being connected to the drive gear,
One of the plurality of driven gears mentioned above is selectively fixed to the lead cam shaft, and the other driven gears are made to idle around the lead cam shaft, so that it is easy to change the amount of movement of the seedling tank relative to the movement of the planting rod. It became easy. In addition, each of the driven gears is fixed to the lead camshaft at a fixed fixed position unique to each driven gear, so no matter which gear ratio is switched, the planting rod, seedling tank, and seedling feeding system are fixed. The movement of the three parts of the device can now be maintained in a pre-adjusted and favorable relationship, eliminating the need to readjust the movement of these three parts when changing the amount of lateral feed, and also improving the timing of the seedling feeding device. During the process of moving the seedling tank without shifting! It is now possible to change the amount of lateral feed. Since a plurality of gears for shifting gears are arranged in advance in the device, there is no need to attach or detach the gears themselves when shifting gears, so the power transmission device is used.

Note that the means for fixing the driven gear to the lead camshaft only needs to be fixed in a fixed positional relationship between the two, so it is not limited to the method using the above-mentioned key, but may also be fixed using a pin, or a clutch may be provided. You can leave it there.

[Brief explanation of the drawing]

1 and 2 are a side view and a plan view, respectively, of a rice transplanter according to the present invention, FIG. 3 is an enlarged sectional view of the main parts, and FIG.
The figure is a side view of the seedling feeding device. l... Airframe, 2... Prime mover, 3... Gear box, 4... Hydraulic cylinder, Six River chain case, 7...
Traveling wheel, 13...flow, l-122...seedling tank, 23° 23', 23", 23m...planting rod, 2
4... Seedling feeding device, 32. 32'... Drive shaft, 33
...Lead cam shaft, 34...Spiral groove, 35, 35'
, H・1... Driven gear, 36, 36'... Drive arm, 38, 38:... Drive gear, 40.40'.
・Chain, 46 model car.

Claims (2)

[Claims] (1) A seedling tank that reciprocates from side to side with the rotation of the series lead cam shaft by the action of an engaging claw that engages with a spiral groove provided on the outer periphery of the lead cam shaft, and a seedling tank placed on the seedling tank. The above-mentioned seedling planting device is equipped with a planting rod that divides, takes out and plants in a field, and a seedling feeding device that sends the seedlings on the seedling tank to the side where the seedlings are taken out at the end of the movement path of the seedling tank. A plurality of driven gears with different gear ratios are provided in parallel and are always connected to a drive gear fitted to a drive shaft for the planting rod, and are rotatably loosely fitted to the lead cam shaft, and these plurality of driven gears are connected in parallel. A power transmission device for a seedling planting device, comprising a gear fixing means that can be selectively fixed to the lead cam shaft while maintaining a constant positional relationship with respect to the lead cam shaft. (2) Claim 1 in which the driving gear and the driven gear are chain gears, and both gears are connected to each other by a chain.
A power transmission device for the seedling planting device described in Section 1.