JPH0637626Y2 - Supporting structure of rolling spring in seedling stand - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a spring support structure in a seedling stand of a rice transplanter.

<Prior Art> Conventionally, when the lateral feed pitch of the seedling stand is adjusted at any position in the middle of the seedling stand, the lateral feed timing of the seedling stand with respect to the planting rod at the moving end of the seedling stand is set. Since the timing of vertical feeding of seedlings is shifted and insufficient scraping and leftover scraping occur at both ends of the seedlings, it is necessary to perform the adjustment at the left and right moving ends of the seedling stand, which is a common dividing point before and after the adjustment. 2 as a lateral feed pitch adjusting device that solves the problem
The device shown in FIG. 4 has been proposed.

That is, FIG. 2 shows a front view of the planting working part separated from the main body of the riding rice transplanter, and the rolling shaft 2 serving as a rolling fulcrum with respect to the main body side is provided at the center of the front side of the frame 1 of the working part.
Hitch 3 integrated with the frame 1 is provided above it.
And a seedling stand 11 is movably mounted on the rear side thereof. Above the drive case 5 provided on the frame 1, the seedling stand 11 is provided by the internal screw shaft.
The lateral feed rod 6 that laterally feeds is projected to form a lateral feed drive device 12. Beam 7 on the lower back of the seedling stand 11 above
A pair of rolling springs between the left and right ends of the and the hitch 3 to balance the load when the seedling stand 11 moves left and right.
8,8 are stretched. Reference numeral 9 denotes a speed change device for switching the lateral feed amount of the seedling stand 11, which is attached to the side end of the drive case 5.

As shown in FIG. 3, the lateral feed drive device 12 is an interlocking shaft to which rotation in synchronization with the planting rod is transmitted from the mission.
Have 15. The front end of the interlocking shaft 15 projects into the speed change case 17, and a sprocket 19 having a boss 19a is rotatably supported in the case 17, and the boss 19a is further rotatably supported.
Sprocket 19 on top of a and other sprockets with different number of teeth 2
0 is rotatably supported.

On the other hand, a screw shaft 21 in which a navia screw is engraved is arranged above the interlocking shaft 15, and the screw shaft 21 is a seedling stand through a follower engaged with the navia screw and a slide bar. It is interlocked with 11, and the seedling stand by the rotation of the screw shaft 21.
11 can be reciprocated, and its shaft end 21a is in the transmission case 1
It projects into 7. Further, the peripheral surface of the shaft end portion 21a of the screw shaft is chamfered in parallel, and two sprockets 22 and 23 having different numbers of teeth are non-rotatable and prevented from coming off by a C ring 25. Supported and these sprockets
22, 23 and the sprockets 19, 20 are linked by chains 26, 27, respectively. It should be noted that both sprockets 1 which are loosely fitted to the interlocking shaft 15 by the transmission of the chains 26, 27.
The rotation ratios of 9,20 are set so that the least common multiple of them coincides with the common division point before and after the lateral feed pitch adjustment. Furthermore,
The transmission case 17 is provided with a lid 29, and boss portions 37, 38 projecting inside the both are abutted against each other, and the lid 29 is detachably attached by a locking bolt 30 screwed or inserted into the boss portions 37, 38. It is fixed.

As shown in FIG. 4, one end of the boss 19a of the sprocket 19 on the interlocking shaft 15 is cut away to form the engaging recess 19b.
Also, the boss 19a is attached to one side of the sprocket 20.
Collar portion 20 that projects annularly so that it is on the same plane as the end
a is provided, and a predetermined portion of the collar portion 20a is cut out to form an engaging recess 20b. That is, the position where the two engaging recesses 19b, 20b are aligned is set so as to exactly coincide with the left and right moving ends of the seedling stand 11 which is a common dividing point before and after the lateral feed pitch adjustment.

Further, the tip end of the interlocking shaft 15 is a chamfered portion 15a and a threaded portion 15b. The transmission plate 31 and the pressing plate 32 are fitted to the chamfered portion 15a, and the nut 35 is screwed through the spring 33 to the threaded portion 15.
It is screwed into b. The transmission plate 31 is, as shown in FIG.
The long hole 31a is fitted into the chamfered portion 15a slidably in the axial direction and slidably in the radial direction, and
It has engaging projections 31c capable of engaging with the engaging recesses 19b, 20b of both sprockets 19, 20 and further has two positioning holes 31d, 31d 'which are parallel to each other with a long hole 31a. The outer end is bent to form a knob 31e.

Further, as shown in FIG. 4, the holding plate 32 is fitted into the chamfered portion 15a by a hole 32a so as to be slidable only in the axial direction, and at a predetermined position, the holding plate 32 is fitted into the hole 31d or 31 'of the transmission plate 31. A protrusion 32b that engages with and positions the transmission plate 31 is formed.

In the above mechanism, the rotation synchronized with the planting rod is transmitted to the interlocking shaft 15, and the chamfered portion 15a further causes the transmission plate 31 and the pressing plate 3 to rotate.
2, the rotation of the transmission plate 31 is transmitted to the sprocket 19 when the engaging projection 31c of the transmission plate 31 is engaged with the recess 19b of the sprocket 19, as shown by the solid line in FIG. , The screw shaft through the chain 26 and sprocket 22
21 is transmitted to the seedling placing table 11 by a predetermined pitch,
For example, it is divided into 30 equal parts and fed horizontally.

Now, for example, when changing the transverse feed pitch from 30 divisions for seedlings to 24 divisions for grown seedlings, with the driving of the planting rod and seedling stand 11 stopped near the left and right moving ends of the seedling stand 11. , Remove the lid 29 of the transmission case 17 with the stop bolt 30. Then, the transmission plate 31 is squeezed in the radial direction of the direction in which the protruding portion pulls in.
When the planting rod is moved by hand while rotating with both sprockets 19 and 20 while being urged with 31e, both sprockets 19 and 20 are rotated.
The engaging recesses 19b and 20b of the seedlings are aligned, and thus the seedling stand 11
Is exactly aligned with the left / right moving end,
31c is switched and engaged with the recesses 19b to 20b.

As a result, the transmission plate 31 is moved to the position shown by the chain line in FIG. 3, and at this position, the positioning projection 32b of the pressing plate 32 is moved to the transmission plate 3.
The transmission plate 31 is held by being engaged with the positioning hole 31d 'of 1 and pressing the pressing plate 32 toward the side surface of the transmission plate 31 by the spring 33. Then, in this state, the rotation of the interlocking shaft 15 is transmitted to the sprocket 20 via the transmission plate 31, and further transmitted to the screw shaft 21 via the chain 27 and the sprocket 23 to laterally divide the seedling placing table 11 into 24 sections. To send.

In the above-mentioned example, the transmission plate 31 is provided on the interlocking shaft 15, but this is provided on the screw shaft 21 so as to switch the sprockets 22 and 23, and the transmission 9 uses the chains 26 and 27 as well as the gears. There are other constant mesh type transmissions such as sprocket and the like, and the number of rotating bodies such as sprockets is not limited to two, but three or more are provided in a superposed manner to increase the number of lateral feed pitch adjustment stages. is there.

<Problems to be solved by the invention> When performing the switching operation in the transverse feed switching mechanism described above, in the state where the seedling stand 11 moves to the outermost end position and the tension difference between the left and right rolling springs 8, 8 is the largest. In order to do so, the engagement protrusion 31c of the transmission plate 31 is engaged with both engagement recesses of both sprockets 19 and 20.
When passing the intermediate position between 19b and 20b, the tension of the spring 8 on the extended side is transmitted to the screw shaft 21 through the lateral feed rod 6, and the screw shaft 21 receives the rotational force through the follower and the spiral of the peripheral surface. , The sprockets 19 and 20 rotate via the chains 26 and 27, and the positions of these engaging recesses 19b and 20b are displaced, making it impossible to move (switch operation) the engaging protrusion 31c from one side to the other side. There was a flaw.

<Means for Solving Problems> In the present invention for solving the above problems, the outer end is locked at the locking points 41 at the left and right outer positions on the rear surface of the seedling stand 11, and the inner end is locked. The locking point on the center side of the working unit frame 1 side
In a mechanism in which a pair of left and right springs 8 and 8 that balance the moving load due to the lateral movement of the seedling stand 11 by being locked with 40, the locking points 41 or 40 of the springs 8 and 8 are set. The feature is that the structure can be adjusted to move in the left-right direction, and the tension difference between both springs 8, 8 caused by the moving state of the seedling stand can be changed.

<Operation> According to the rolling spring supporting structure of the present invention, the seedling stand is located at the left and right moving ends, and the left and right balancing springs are provided.
Even when the transverse feed switching operation is performed with the tension difference of 8 and 8, the locking point 40 or 41 at the inner end or the outer end of the spring on the high tension side is set in the direction in which the tension acts. By adjusting the movement, the tension difference between the left and right springs is relaxed, and due to the imbalance of the tension, the positioning of the plurality of rotating bodies of the interlocking shaft 15 via the screw shaft 21 for shifting (switching) operation is displaced. Therefore, the switching operation can be performed reliably and easily.

<Embodiment> FIGS. 1 and 5 show two embodiments of the lock device of the present invention. The lateral feed switching mechanism in which the lock device is implemented is already described in FIGS. Since the structure is almost the same as that of the above, the numbers of parts and the like are made common, and the description of the same parts is omitted.

In the embodiment shown in FIG. 1, the inner ends of the left and right springs 8 and 8 are attached to both sides of a hitch 3 which is integral with the frame 1 at locking points 40 and 40.
, And the other end (outer end) is locked at each of the locking points 41, 41 provided on the beam 7 on the rear surface of the seedling stand 11, and the locking points 41, 41 are fixed on the beam 7 as shown in the figure. A plate-like locking tool 42 having a long hole 42a in the center fixed to the left and right ends of the rear surface, and the long hole 42a for locking the end portion of the spring 8
And a set screw 4 for fastening and setting the slider 43 at any position on the long hole 42a.
It is composed of 4 and.

With this mechanism, when switching the transverse feed with the seedling stand 11 moved to the left in front view, as shown in the figure, the locking point on the left side
To move only 41 to the right, loosen the set screw 44, move the slider 43 to the right, and tighten the set screw 44 again to reduce the tension difference between the right side spring 8 and the left side spring 8. The rotational force applied to the screw shaft 21 via the rod is also weakened, and as a result, the engagement recesses 19 of the sprockets 19 and 20 aligned in the transmission 9 described above.
There is no deviation between b and 20b. As a result, lateral feed switching can be performed quickly and reliably.

FIG. 5 shows a second embodiment of the present invention, in which a rocker 45 'having a lever 50 attached to the upper end of the hitch 3 is mounted on a rocking shaft.
47 'is pivotally supported, and a locking point 40 is provided on the upper end of the rocking body 45'.
The inner ends of the left and right springs 8, 8 are locked here.

The lever 50 is a mechanism for swinging while adjusting the swinging body in the left-right direction.

That is, a sectoral locking guide 49 is erected on the hitch 3 along the rocking body 45 ', and a plurality of locking grooves 49a for engaging and disengaging the lever 50 are formed at the upper bent end of the locking guide 49. Although the lever 50 is locked in the locking groove at the neutral position during normal work, the lever 50 is engaged at the position where it is oscillated toward the right or left spring having a stronger tension during the lateral feed switching operation. Gutter
By being housed and locked in the 49a, the difference in tension between the springs on the left and right sides is alleviated.

In both of the above cases, the left and right springs are used when switching the lateral feed
Ideally, the tension difference between 8 and 8 is zero, but in reality, the tension difference between the springs is below a certain level due to mechanical resistance in the transverse feed drive device, and rotation of the screw shaft 21 is suppressed. Then, the object of the present invention can be achieved.

<Effects of the Invention> According to the present invention configured as described above, even when the lateral feed adjusting and switching device of the seedling stand has a mechanism in which spring tension acts, the lateral feeding performed at the moving end of the seedling stand. By moving and adjusting the locking point of the spring on the side with a large tension at the time of switching, it is possible to balance the tension of the spring and prevent the screw shaft from rotating due to the difference in spring tension. It has the advantage of being performed reliably.

Further, since the above mechanism and operation are extremely simple, the cost is low, and it is not necessary to prepare a special tool for the operation.

In addition, the spring support structure of the present invention can be widely used for adjusting the balance of the left and right springs, such as when the tension imbalance of the left and right springs occurs when the traveling body leans to the left or right. Needless to say.

[Brief description of drawings]

FIG. 1 is a front view of essential parts showing a first embodiment of the present invention, and FIG. 2 is a front view showing a complete view of a conventional planting work section of a rice transplanter,
FIG. 3 is a cross-sectional view of a transverse feed switching mechanism without a locking device, FIG. 4 is a perspective view of the same, and FIGS. 5 (A) and 5 (B).
FIG. 6 is a front view and a side view or a plan view showing a locking point of a spring according to a second embodiment of the present invention. 1: Working frame, 8: Spring 11: Seedling stand, 40, 41: Spring

Claims (1)

[Scope of utility model registration request] 1. The outer end is locked at the locking points (41) at the left and right outer positions on the rear surface of the seedling stand (11), and the inner end is fixed to the working part frame (1).
Seedling stand (11) locked at the locking point (40) on the center side of the side
In a mechanism in which a pair of left and right springs (8) and (8) are stretched to balance the moving load due to the left and right movement of the spring, the locking point (41) or the locking point (4) of the springs (8) and (8).
(0) is a structure that can be moved and adjusted in the left-right direction, and the rolling spring support structure in the seedling stand is configured to change the tension difference between both springs (8) and (8) caused by the moving state of the seedling stand.