JPH0317609Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on a lateral movement mechanism that reciprocates the seedling tray in its width direction so that the amount of seedlings taken can be changed by changing the number of times the seedling tray is taken out with respect to the total length of the lateral movement of the seedling tray. A first gear and a second gear are attached to one of the drive rotation shaft and the planting mission input shaft so as to be integrally rotatable, and a third gear that engages with the first gear and a third gear that engages with the second gear on the other hand. The present invention relates to a rice transplanter in which a speed change gear member, which is connected to a fourth gear, is attached so as to rotate integrally and slidably in the axial direction, and a speed change operation tool is linked to the speed change gear member.

In the above rice transplanter, generally, the relative ratio of the period is set so that the operation period of the planting claw drive mechanism is an integral multiple of the horizontal reciprocating period of the seedling platform.
Although the structure is such that the entire width of the seedlings is divided without exception, if the seedlings are divided from the middle of the width of the seedlings when the relative ratio is changed using the device for changing the amount of seedlings taken,
Since there is a possibility that the seedlings will not be divided in some places, this should be done at both ends of the seedling width, but in such a case, if the relative position of the planting claw to the seedling stand before and after the change is not constant. There is a possibility that the operation timing of the planting claw drive mechanism linked to the horizontal reciprocating movement of the seedling platform may be off, resulting in seedlings that cannot be divided at the end of the width of the seedlings or inadvertently taking out small divided seedlings. Therefore, it is necessary to time the above-mentioned timing for changing the seedling harvest amount changing device.
However, the first gear that engages the third gear with the first gear
When switching alternately between the first state and the second state where the fourth gear is engaged with the second gear, if the gear becomes disengaged as a result of the gear change operation, the drive rotation shaft side of the lateral movement mechanism of the seedling stand will The gear will stop rotating due to the mass of the seedling stand, but the gear on the planting mechanism input shaft is driven by the rotation of the input shaft, so if you don't change the speed quickly, the timing will be off. There was a drawback that some seedlings were left behind.

In view of the above points, it is an object of the present invention to make it possible to avoid shifts in switching timing in a gear type transmission mechanism through simple improvements.

In order to achieve the above object, the present invention provides the above-mentioned rice transplanter with a trough in each of the two gears attached to the input shaft among the first to fourth gears at a position other than a specific phase in the circumferential direction. The invention is characterized in that a cover is provided to cover the rotating shaft and prevent the two gears attached to the rotating shaft from coming into contact with each other in a phase other than a specific phase.

In other words, when switching between the first state and the second state described above, if the gears' occlusion phases do not match, the gear will come into contact with the cover and will not engage, and the lateral feeding of the seedling stand will be stopped. If the implanted nail remains as it is, the implanted nail will be allowed to run idle once before it is bitten.

Therefore, although the improvement is as simple as providing a cover for each of the two gears, it has become possible to engage the gears only at a predetermined phase during gear shifting, and to avoid discrepancies in gear switching timing.

Hereinafter, embodiments of the present invention will be described in detail with reference to illustrative drawings.

In order to drive the seedling stand 1 in the seedling planting device of a rice transplanter, a seedling input shaft 3 and a screw shaft 4 interlocked with a pinion shaft 2a are rotatably mounted on the planting mission case 2, and the rotation shaft 5 is provided so as to be rotatable and slidable, and a piece receiver 7 that engages with the endless belt-shaped screw portion 6 of the screw shaft 4 is attached to the rotary shaft 5 so as to be rotatable only, and both ends of the rotary shaft 5 are placed on a seedling. It is connected to the stand 1 so as to be rotatable only, and as the screw shaft 4 rotates, the rotary shaft 5 is reciprocated and slid in its axial direction, and the seedling stand 1 is moved reciprocally and laterally.

A star wheel 8 for vertical feeding is provided at the bottom of the seedling table 1 with a part of its circumferential direction penetrating and protruding from the bottom plate toward the seedling placement side, and the star wheel 8
and the swinging arm 9 are interlocked and connected via a ratchet mechanism (not shown), and the swinging arm 9 and the lever portion 5a connected to the rotating shaft 5 are connected by a link 10.
cam followers 11, 11 are integrally and rotatably connected to each side of the piece receiver 7 of the rotating shaft 5, and vertical feed cams 12, 12 are integrally and rotatably connected to each end of the screw shaft 4. Install each on the
When the seedling stand 1 moves to a position where its moving direction is reversed or a position close to it, the cams 12, 12
is brought into contact with the follower 11 to rotate the rotating shaft 5, and at the same time, the star wheel 8 is rotated in only one direction, and the seedlings placed on the seedling stand 1 are transferred to the side from which the planting claws 13 take out the seedlings. The vertical feed mechanism 14 is configured to do so.

A first gear 15 with a large diameter and a second gear with a small diameter are attached to the screw shaft 4.
A gear 16 is rotatably attached to the transmission input shaft 3, and a third gear 17 of a small diameter engages and disengages from the first gear 15, and a fourth gear of a large diameter engages and disengages from the second gear 16. A transmission gear member 19 connected with 18 is attached so as to be integrally rotatable and slidable in the direction of the rotational axis, and the moving speed of the seedling stand 1 is controlled, that is, in the left and right width direction of the seedling stand 1. A gear type transmission mechanism 20 is configured so that the number of times seedlings are taken out by the planting claw 13 can be changed in two stages.

A gear shift operating tool 21 is provided in the transmission case 2 so as to be slidable by pushing and pulling, and a pair of spring receivers 22, 22 are provided at the ends of the gear shifting operating tool 21 inside the case so as to be freely displaceable within a predetermined range in the axial direction. At the same time, a coil spring 23 is interposed between the spring receivers 22, 22, and the coil spring 2
A cylindrical body 24 is provided with the spring receivers 22 and 22 installed inside the cylindrical body 24, and contact members 25 that abut the spring receivers 22, 22 are connected to the cylindrical body 24. A shift fork 26 is connected to the gear member 19.

Further, a stopped member 28 having two locking holes 27, 27 spaced apart from each other by a predetermined distance in the axial direction is connected to the cylindrical body 24, and the locking holes 27,
The stopper 29 that selectively engages and disengages from the screw shaft 4
The stopper 29 is rotatably fitted loosely into the end of the case 2, and a coil spring 30 is provided between the inner wall of the case 2 and the stopper 29 to urge the stopper 29 to swing toward the locking hole 27, and A part of the stopper 29 is moved vertically to the cam 1.
The stopper 29 is extended close to the locking hole 27 and comes into contact with the cam follower 11 rotated by the cam 12 to swing the stopper 29 and disengage it from the locking hole 27.

With the above configuration, as the speed change operation tool 21 is operated to change the speed, the coil spring 23 applies a force to displace the stopped member 28 to one side, while the stopper 29 prevents the displacement. Only when the seedling stand 1 moves to one of the moving direction reversal positions or a position close to it and the rotary shaft 5 is rotated, the rotation causes the stopper 29 to be released by the action of the cam follower 11, and the coil is accordingly released. The biasing force of the spring 23 causes the transmission gear member 19 to switch and slide.

As shown in FIG. 3, the speed change operating tool 21 includes:
It is inserted into an inclined guide groove 31a formed in an arc-shaped lever guide 31 that extends from and near the mission case 2, and slides in a push-pull state by rotating around the sliding axis toward the mission case 2. It is configured so that it can be operated to change gears. Also, guide groove 3
A locking portion 3 is provided at each end of the locking portion 3 so as to maintain the operating state using the biasing force of the coil spring 23 until the stopper 29 performs the release operation.
2 and 32 are additionally formed. In the stopped member 28, cam surfaces are formed at both ends of the partition member 33 between the locking holes 27, 27, so that the stopper 29 can be easily locked. A cover 34 is connected to each of the first gear 15 side of the third gear 17 and the second gear 16 side of the fourth gear 18, and the covers 34, 34 are provided with a cover 34, respectively, when viewed in the rotation axis direction of the input shaft 3. , a recess 35 is provided so as to expose only one specific valley in the circumferential direction, and the first gear 15 and the third gear 17, and the second gear 16 and the fourth gear
The gears 18 are configured to engage only in a specific phase when passing through the recess 35.

FIGS. 6 and 7 show another embodiment in which a boss member 36 is loosely fitted onto the rotating shaft 5 of the vertical feed mechanism 14, and the boss member 36 is integrally connected to the frame receiver 7. An arm 37 for releasing the stopper 29 is rotatably attached and urged by a coiled spring 38 to maintain a predetermined position, and a cam 39 acting on the arm 37 is attached to the screw shaft 4, and That cam 39,
As shown in FIG. 7, the vertical feed cam 12 is mounted with a predetermined phase shift toward the lower side in the rotational direction, and when the seedling stand 1 is moved to the reverse position in one direction of movement, the vertical feed mechanism 14 The stopper 29 is configured to be released when the vertical feeding action is completed.

In the above embodiment, the screw shaft 4 is provided so as to be freely rotatable and the seedling stand 1 is moved laterally. The screw shaft 4 may be connected to the seedling stand 1 to move the seedling stand 1 laterally in its width direction, and these mechanisms are collectively referred to as a lateral movement mechanism.

In addition, as for the transmission gear member 19, it is provided on the screw shaft 4 side, or when applied to a type in which the screw shaft 4 is moved laterally, on the piece receiver 7 side. They may be provided on the side where the drive shaft 4 is moved, and these are collectively referred to as the drive rotation shaft 4 of the lateral movement mechanism.

[Brief explanation of the drawing]

The drawings show an embodiment of the rice transplanter according to the present invention, FIG. 1 is a side view of the main part, FIG. 2 is a longitudinal sectional view of the main part,
Fig. 3 is an enlarged view of the main part of Fig. 2, Fig. 4 is a partially cutaway right side view of Fig. 3, Fig. 5 is a sectional view taken along the - line of Fig. 3, and Fig. 6 shows another embodiment A sectional view of the main parts shown,
FIG. 7 is a sectional view taken along the line -- in FIG. 6. 1... Seedling stand, 3... Input shaft, 4... Rotating shaft, 15... First gear, 16... Second gear, 17
...Third gear, 18...Fourth gear, 19... Gear shift member, 21... Speed change operating tool, 34... Cover.

Claims (1)

[Scope of utility model registration request] A drive rotation shaft 4 of a lateral movement mechanism that reciprocates the seedling platform 1 in its width direction and a planting mission input shaft 3
On the other hand, the first gear 15 and the second gear 16 are connected to one side.
are attached so as to be rotatable together, and a third gear 17 that meshes with the first gear 15 and a second gear
A rice transplanter in which a speed change gear member 19 connected with a fourth gear 18 meshing with a gear 16 is attached so as to be able to rotate integrally and slide freely in the axial direction, and a speed change operation tool 21 is linked to the speed change gear member 19. Of the first to fourth gears 15, 16, 17, 18, each of the two gears 15, 16 or 17, 18 attached to the input shaft 3 has a valley in a phase other than a specific phase in the circumferential direction. two gears 17 covered and attached to the rotating shaft 4;
A rice transplanter characterized by being provided with a cover 34 that prevents occlusion in a phase other than the specified phase 18 or 15 or 16.