JPH083B2 - Seedling table gearbox for mobile agricultural machinery - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a transmission device that shifts and adjusts the lateral feed speed of a seedling mounting table provided in a planting unit equipped in a mobile agricultural machine.

[Conventional technology]

Generally, the lateral feeding device of the seedling mounting table provided in the planting section determines the scraping amount for the unit planting stock by the planting rod according to the growing state and density of the seedlings, that is, the seedlings, the medium seedlings, the adult seedlings, etc. In order to adjust the seedlings, there is provided a transmission that shifts the lateral feed speed by switching the shift clutch.If this adjustment is made at any position during the movement of the seedling table, the seedlings will be planted at the moving end of the seedling table. The horizontal feeding timing of the seedling mounting table with respect to the attachment rod and the vertical timing of the seedling are deviated, resulting in insufficient scraping at both ends of the seedling or leftover scraping. Therefore, normally, the gear shifting operation is performed when the seedling placing table is at the left and right moving ends.

[Problems to be Solved by the Present Invention]

By the way, in order to maintain the left-right weight balance caused by the reciprocating movement, the seedling table that is fed back and forth laterally is provided with a rolling spring. The maximum tension is reached when the transmission is transversely shifted. For this reason, if the clutch of the transmission becomes neutral during the operation process, the seedling table suddenly moves during this short time, making it difficult to switch the clutch, or the number of seedlings scraped by the planting rod. Could affect the work environment and, in addition, could lead to a very dangerous work situation. Even with a seedling table without a rolling spring, the same problem as described above occurs if the seedling table shakes unintentionally when the clutch of the transmission operates.

Therefore, if an attempt is made to prevent the neutral state during the operation of the clutch, there is a problem that a simultaneous meshing state occurs at the time of switching the clutch and an unreasonable force acts on the clutch, and a smooth gear shift operation cannot be performed.

The present invention was devised to eliminate the above-mentioned drawbacks, and the lateral feed speed of the seedling mounting table was changed not only during the lateral movement of the seedling mounting table, but also at the left and right moving end portions of the seedling mounting table. There is no neutral state in the clutch operation process, the seedling table does not move carelessly and the number of seedlings scraped by the planting rod is not affected, and the clutch is in the simultaneous meshing state. It is an object of the present invention to provide a lateral feed transmission device for a seedling mounting table that can smoothly and safely perform a gear changeover operation.

[Means for solving the problem]

Technical means taken by the present invention to solve the above-mentioned problem is to change the transverse feed speed of the transverse feed mechanism of the reciprocating transverse feed seedling table by switching the shift clutch provided on the drive shaft. In a mobile agricultural machine, a speed change clutch is provided in which a floating sprocket that transmits power to the transverse feed mechanism at different speed ratios is opposed to the drive shaft, and slides only in the axial direction of the drive shaft between the opposed floating sprockets. And the clutch claws provided on both sides of the speed change clutch are selectively fitted into one of the fitting recesses provided on the side surfaces of the two floating sprockets to switch and transmit power to the lateral feed mechanism and to the fitting recess. Is provided with a simultaneous meshing prevention zone for guiding the clutch claw to allow the clutch claw fitted to the other floating sprocket to escape from the fitting recess. A.

[Operation of the invention]

Therefore, according to the present invention, the speed change device provided in the lateral feeding mechanism of the seedling mounting table shifts the lateral feeding speed of the seedling mounting table that reciprocates left and right, and the scraping amount of the seedlings from the seedling mounting table, It can be adjusted according to the growing condition and density of the seedlings.

Then, the lateral feed speed of the seedling mounting table is directly switched by selectively fitting the clutch claws provided on both sides of the speed change clutch to the fitting recesses provided on both floating sprockets, so that the neutral position disappears during the shifting process and the seedling mounting speed is reduced. The platform does not move carelessly. Further, since the clutch claw is fitted in the fitting recess provided with the simultaneous meshing prevention zone, the clutch claw does not simultaneously mesh with the fitting recess of the opposing sprocket and an unreasonable force is applied.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a traveling machine body of a passenger rice transplanter, and the traveling machine body 1
A planting part 2 is provided at the rear part of the plant via a link mechanism 3 so as to be able to move up and down. Reference numeral 4 is a drive case, 5 is a planter case, a planting rod 6 is attached to the rear part of the planter case 5, and a seedling table 7 which is reciprocally fed laterally is provided above and below in a low shape. . Then, by rotating the planting rod 6, the seedlings placed on the seedling platform 7 are scraped for each unit planting stock and planted in the field as in the conventional case.

Reference numeral 8 denotes a slide bar that slides while being guided by the screw shaft 9. The seedling stand 7 is connected and fixed to the slide bar 8 via a bracket 10. Reference numeral 11 denotes a transverse feed mechanism, in which the sliding sprockets 13 and 14 are slidably inserted only in the axial direction through a collar 15 having a predetermined interval on the screw shaft 9 protruding into the case 12, and a C pin 16 is provided. At the end of the drive shaft 17, which is prevented from coming off, and which protrudes downward from the screw shaft 9, the free sprocket 18,1 is attached.
9 is rotatably inserted, and by connecting the sprockets 13 and 18 and the sprockets 14 and 19 by transmission chains 20 and 21, power is transmitted at different gear ratios.

A slidable collar 22 that regulates the distance between the sprockets 18 and 19 to a predetermined width is inserted between the floating sprockets 18 and 19 through a liner 23, and fixed by a pin 24 that penetrates the drive shaft 17. Has been done. 25 is C for retaining
It's a pin.

Reference numeral 26 denotes a speed change clutch of the speed change device, which is slidably disposed between the floating sprockets 18 and 19 facing each other, and is locked to the pin 24 to rotate integrally with the drive shaft 17.

The speed change clutch 26 has clutch pawls 2 on both sides thereof.
Mating recesses 28 and 2 in which the clutch claws 27 and 27 'are fitted in the protruding parts of the floating sprockets 18 and 19, respectively.
8'is formed so that the speed change clutch 26 can be selectively fitted to either one of the floating sprockets 18 and 19.

Reference numeral 29 denotes a shift shifter for moving the shift clutch 26. An arm 31 is integrally fastened and fixed to a shaft 30 of the shift shifter 29 at a lower end portion protruding from the case 12 via a nut 32. Reference numeral 33 denotes a speed change lever operated along the guide plate 34, the tip of the speed change lever 33 is locked to the arm 31, and a coil-shaped elastic body 35 is provided in the middle thereof. .

Further, the guide plate 34 is formed with a locking groove 36 for holding the shift lever 33 at a predetermined shift position and a restricting groove 37 for the arm 31. The engagement groove 36 of the shift lever 33 may be formed over the upper surface of the guide plate 34 as shown in FIG.

And the fitting recess 2 provided on the floating sprockets 18 and 19
8 and 28 'are concave portions a into which the clutch pawls 27 and 27' are fitted, as shown in FIGS. 4 and 5 (the lower half of the drawing shows the upper half of which is developed along the fitting concave portion). , a ', and shallower flat surface portions b, b', and inclined portions c, c'for guiding the clutch pawls 27, 27 'to form a simultaneous meshing prevention zone. That is, as will be described later, when a gear shifting operation is performed, one clutch pawl 27 (27 ') is not inclined to the inclined portion c.
(C ') and the flat portion b (b'), the other clutch pawl 27 '(27) is fitted into the fitting recess 28' (28).
Is completely disengaged so that the speed change clutch 26 does not mesh with both floating sprockets 18 and 19 at the same time.

When one clutch pawl 27 is fitted to the floating sprocket 18, the gap S ₁ between the other clutch pawl 27 'and the floating sprocket 19 is equal to or slightly larger than the depth S ₂ from the horizontal portion b to the recess a. The relationship S ₁ ≧ S ₂ is established.

The same applies when the other clutch pawl 27 'is fitted with the floating sprocket 19.

In addition, the speed change clutch 26 and the floating sprocket 18, (1
If 9) is not fitted each time it rotates 360 degrees, the timing will be misaligned and it will not be possible to plant. Therefore, as shown in Figs. 6 and 7, clutch claws 27 and (27 ') are provided at two locations. In addition, the convex portion e is asymmetrical with the position displaced by D degrees, and the fitting concave portion 28 (28 ') is also formed at a position corresponding to this so that the fitting concave portion 28 (28') is always fitted every 360 degrees. .

A rolling spring 38 is provided on the seedling placing table 7 so that the weight balance can be maintained even when the seedling placing table 7 reciprocates left and right. 39 is a float, 40 is a planting section 2
It is a stand that supports.

In the above structure, if the speed change clutch 26 is now fitted to any one of the floating sprockets 18 (19), the screw shaft 9 rotates at a predetermined speed in cooperation with the speed change clutch 26 that rotates integrally with the drive shaft 17. Then, the slide bar 8 is slid to reciprocate the seedling placing table 7 to the left and right. As shown in FIGS.
Has a gap S ₁ slightly larger than the depth S ₂ of the recess a with the other free sprocket 19 when it is completely fitted in the fitting recess 28 of the one free sprocket 18. Operate 33 to lock the other locking groove of the guide plate 34.
When locked by 36, the shift clutch 26 moved by the shift shifter 29 comes out of the recess a and contacts the protrusion of the other floating sprocket 19 as shown by the dotted line in FIG. It is held as it is by the force. Then, when the timings match, the other clutch 27 'is formed in the fitting recess 28' of the floating sprocket 19, and the inclined portion C'of the simultaneous meshing prevention zone is formed.
To the horizontal part b '.

At this time, one clutch pawl 27 is completely removed from the fitting concave portion 28, and the other clutch pawl 27 'is fitted into the concave portion a'by the rotation of the speed change clutch 26 and the urging force of the elastic body 25 to smoothly switch gears. Is completed.

Therefore, if the gear shift operation is performed even when the vehicle is planted, the gear shift is switched when the timing is met, and the shift clutch
Since 26 shifts directly without shifting to the neutral state, the tension of rolling spring 38 changes
When acting in the direction opposite to the direction of rotation of 26, the shift clutch 26
Will be locked at the step h of the fitting recess 28, and even if the seedling table 7 is gear-shifted at its moving end, the seedling table 7 will not move carelessly due to the tension of the rolling spring 38. Absent.

Further, the floating sprocket 18, 19 can be surely held at a predetermined interval only by inserting the collar 22 between the facing,
Moreover, when changing the lateral feed speed to a different speed range, it is possible to easily pull out the sprocket and replace it with a sprocket having a different speed ratio simply by removing the C pins 16 and 25.

Further, since the collar 22 is fixed by the pin 24 penetrating the drive shaft 17, and the speed change clutch 26 is rotationally driven,
The strength of the pin hole portion formed in the drive shaft 17 can be increased.

〔The invention's effect〕

In short, the present invention is directed to the transverse feeding mechanism of the seedling table which is fed back and forth in a moving agricultural machine in which the transverse feeding speed is changed by switching the shift clutch provided on the drive shaft. And a floating sprocket for transmitting power at different gear ratios are provided facing each other on the drive shaft, and a shift clutch that slides only in the axial direction of the drive shaft is provided between the facing sprocket and both sides of the shift clutch. The clutch pawl provided is selectively fitted into one of the fitting recesses provided on the side surfaces of both floating sprockets to switch and transmit power to the transverse feed mechanism. Since there is a simultaneous meshing prevention zone that allows the clutch claw fitted to the floating sprocket to escape from the fitting recess, it is reciprocated by the transmission provided in the lateral feed mechanism of the seedling mounting table. Since the lateral feed speed of the seedling table to be sent can be freely changed, it is possible to adjust the scraping amount of the seedlings placed on the seedling table to an appropriate amount according to the growing condition and density of the seedlings. it can. And the gear shifting operation of this seedling mounting table is directly switched by the gear shifting clutch having no neutral position in the gear shifting process in which the clutch claws provided on both sides of the gear shifting clutch are selectively fitted into the fitting recesses provided on both floating sprockets.
The seedling stand does not move carelessly. Moreover, the clutch claw fits into the fitting recess provided with the simultaneous meshing prevention zone, so that the clutch claw does not simultaneously engage with the fitting recess of the floating sprocket and an unreasonable force does not act, resulting in smooth gear shifting. It can be operated.

[Brief description of drawings]

The drawings show an embodiment of a transmission device for a seedling mounting table in a mobile agricultural machine according to the present invention, and FIG. 1 is a sectional view of a main part,
FIG. 2 is a view taken in the direction of arrow A in FIG. 1, FIG. 3 is a view taken in the direction of arrow B in FIG. 2, and FIGS. 4 and 5 are explanatory views of the operation of the shift clutch (the upper half of the lower half of the drawing is fitted). 6 and 7 are state views of the clutch pawls, FIG. 8 is a sectional view of the fitting concavities, FIG. 9 is a sectional view of the clutch pawls, and FIG.
FIG. 11 is a perspective view of a main part, FIG. 11 is a side view of a planting part, FIG. 12 is an overall side view of a mobile agricultural machine, and FIG. 13 is a perspective view showing another embodiment of a guide plate. In the figure, 2 ... planting section, 7 ... seedling stand, 11 ... lateral feed mechanism, 26 ... shift clutch.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Anji Wada 667 Isuyacho, Higashi Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 Mitsubishi Agricultural Machinery Co., Ltd.

Claims (1)

[Claims] 1. A transverse feeding mechanism for a seedling table which is fed back and forth laterally,
In a mobile agricultural machine configured to change a transverse feed speed by switching a shift clutch provided on a drive shaft, a floating sprocket that transmits power at a different gear ratio toward the transverse feed mechanism is provided opposite to the drive shaft. A shift clutch that slides only in the axial direction of the drive shaft is provided between opposed floating sprockets, and clutch pawls provided on both sides of the shift clutch are selected as either fitting recesses provided on the side surfaces of both floating sprockets. Simultaneous meshing prevention zone for fitting and transmitting power by switching to the lateral feed mechanism, and guiding the clutch pawl to the fitting recess so that the clutch pawl fitted to the other floating sprocket escapes from the fitting recess. A transmission device for a seedling mounting table in a mobile agricultural machine, characterized by being provided with.