JPH033138Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transverse feed adjustment device for a seedling bed in a rice transplanter, and more particularly to a switching device for switching the transverse feed pitch.

Conventionally, the lateral feed adjustment device for seedling trays was developed in 1983.
As shown in Japanese Patent No. 65022, a plurality of rotary bodies are arranged in an overlapping manner so as to loosely fit and support other rotary bodies on the boss of the rotary body, and engagement recesses are formed on one side of each of these rotary bodies. By engaging the claw of the switching plate with one of these engaging recesses, the transverse feed pitch can be adjusted only at the common dividing point before and after the transverse feed pitch is adjusted. However, in this lateral feed adjustment device, the contact surfaces of the engagement recesses that the claws contact have the same shape for the inner and outer rotating bodies, so the planting rods may get caught in stones, etc., and the torque limiter may operate. In this case, as the pawl and the contact surface of the engaging recess come into contact with each other and move apart, they may move slightly up and down due to vibration, and eventually move to a neutral position, making lateral feeding impossible. Then, when the stones, etc. are removed and the planting work is restarted, the user may not realize that the seedling stand cannot be moved horizontally, resulting in continuous missing plants and the need for major repairs.

Therefore, in the present invention, the contact surface of the engagement recess that the pawl of the switching plate comes into contact with during power transmission is arranged so that the contact surface of the inner engagement recess generates a force in the inner radial direction on the pawl, and the contact surface of the engagement recess on the outside It is an object of the present invention to provide a switching device for a transverse feed adjustment device for a seedling stand, which is configured such that the contact surface of the recessed portion generates a force in the outer diameter direction on the claw, thereby eliminating the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the rice transplanter 1 has paddy wheels 2.
The machine body 3 includes an engine 5, a transmission 6, etc., and a planting rod 7 is provided at the rear thereof so as to be rotatable by receiving power from the transmission 6. ing. Further, the fuselage 2 has a float 9 swingably suspended below it, and a handle 10 facing rearward.
has been extended. Along and above the handle 10, a seedling stand 11 is slidably supported by a slide piece, and the seedling stand 11 is reciprocated left and right by a transverse feed drive device 12. As shown in FIG. 2, the lateral feed drive device 12 has an interlocking shaft 15 to which synchronous rotation is transmitted from the mission 6 to the planting rod 7.
The leading end of the interlocking shaft 15 protrudes into the transmission case 17, and a sprocket 19 having a boss 19a is rotatably supported within the case 17.
Furthermore, another sprocket 20 having a different number of teeth from the sprocket 19 is rotatably supported on the boss 19a, and both sprockets 19 and 20 are arranged in an inner-outer overlapping manner. On the other hand, above the interlocking shaft 15, a screw shaft 21 having a napier screw is disposed, and the screw shaft 21 is connected to a seedling stand via a follower and a slide bar that are engaged with the napier screw. 1
1, the seedling stand 11 can be reciprocated by the rotation of the screw shaft 21, and its one end 2
1a protrudes into the transmission case 17. Also,
Two sprockets 22, 23 having different numbers of teeth are supported at one end 21a of the screw shaft in a non-rotatable manner and are prevented from coming out by a C pin.
20 are linked by chains 26 and 27, respectively. The rotation ratio of both sprockets 19 and 20, which are loosely fitted to the interlocking shaft 15 through transmission by the chains 26 and 27, is set so that the common multiple thereof coincides with the common dividing point before and after the lateral feed pitch adjustment. . For example, if the distance that the seedling stand is moved horizontally from one common dividing point to the next common dividing point is Scm, then this Scm can be expressed as αsec by the sprocket 19.
Let Xrps be the rotation speed when horizontally feeding. on the other hand,
If you try to use βsec to move the seedling stand horizontally by Scm using sprocket 20, sprocket 2
0 rotation speed Yrps and sprocket 19 rotation speed
The relationship with Xrps is αX = βY. Here, if α and β are integers, αX=βY is a common multiple of X and Y. If the relationship between X and Y, that is, the rotation ratio is determined in this way, the least common multiple thereof can be made to coincide with the common dividing point before and after the traverse feed pitch adjustment. In other words, no matter which sprocket 19 or 20 rotates by a common multiple of Regarding the relationship, one common dividing point and the next common dividing point have exactly the same positional relationship. In addition, if the number of divisions of the seedlings is an even number, such as 30 divisions and 24 divisions, the common division points occur at both ends of the left and right reciprocating movement of the seedling stand (see Utility Model Publication No. 54-46180). Further, the lid 29 is attached to the stop bolt 30 on the transmission case 17.
It is removably fixed.

The tip of the interlocking shaft 15 has a two-chamfered portion 15.
a and screw shaft 15b, with two chamfered portions 1
A switching plate 31 and a holding plate 32 are fitted to 5a,
Further, a nut 35 is screwed into the threaded portion 15b via a spring 33. Furthermore, the switching plate 31 is
As shown in FIG. 3, it has a long hole 31a, a claw 31b, a round hole 31c, and a knob 31d.
1a is slidably fitted into the two-chamfered portion 15a of the interlocking shaft 15 by a predetermined amount in the radial direction, and the pawl 31b is cut and raised to protrude laterally and has a predetermined width L;
It can be selectively engaged with engagement recesses 19b and 20b (see FIG. 4), which will be described later, and the round hole 31c can also indicate the switching position of the switching plate 31.

Further, as shown in FIGS. 4 and 5, the end of the boss 19a of the sprocket 19a is cut out at a predetermined location to form an engagement recess 19b, and one side of the sprocket 20 is provided with an engagement recess 19b located inside. boss 1
9a and a concentric ring-shaped flange 2 having a predetermined gap C.
0a is formed, and the collar portion 20a is further notched at a predetermined location to form an engagement recess 20b.
The engagement recess 19b located inside is the fourth
As shown in Figure a, the surface on the rotation direction side, that is, the claw 3
The contact surface A with 1b is formed parallel to the diameter line 0-0 at a radius R position larger than half of the nail width L,
Therefore, due to the pressing action from the claw 31b to the contact surface A, a force is generated in the inner diameter direction on the claw 31b. Also,
As shown in FIG. 4b, the engagement recess 20b located on the outside has a surface on the rotation direction side, that is, a contact surface B with the pawl 31b, at a radius r position smaller than half of the pawl width L, along the diameter line 0-. 0, and therefore, due to the pressing action from the claw 31b to the contact surface B, the claw 3
A force is generated in the outer diameter direction in 1b.

Since this embodiment has the above configuration, rotation in synchronization with the planting rod 7 is transmitted to the interlocking shaft 15,
Furthermore, the information is transmitted to the switching plate 31 by the two chamfered portions 15a, and as shown by the solid line in FIG.
b, the rotation of the switching plate 31 is transmitted to the sprocket 19 and further transmitted to the threaded shaft 21 via the chain 26 and sprocket 22, whereby the seedling stand 11 is rotated at a predetermined pitch, e.g. It is divided into equal parts and fed horizontally. On this occasion,
As shown in FIG. 5, based on the claw 31b of the switching plate 31 coming into contact with the contact surface A of the engagement recess 19b, a force acts on the claw 31b in the inner radial direction, and this force is applied to the claw 31b in conjunction with the contact surface A of the engagement recess 19b. The switching plate 31 is received by contacting the shaft 15, so that the switching plate 31 is stably held in this position.

For example, when changing the horizontal feed pitch from 30 divisions for young seedlings to 24 divisions for adult seedlings, the driving of the planting rod 7 and the seedling tray 11 must be stopped at the end of the left-right movement of the seedling tray 11. After removing the lid 29 of the transmission case 17 using the fixing bolt 30, the knob 31 is moved in the radial direction of the switching plate 31 in the direction in which the protruding portion thereof is retracted.
d to move the claw 31b from the recess 19b.
Switch to 0b. As a result, the switching plate 31 is moved to the position shown by the chain line in FIG.
is transmitted to the screw shaft 21 via the seedling stand 11.
Transverse feed in 24 divisions. At this time, based on the claw 31b of the switching plate 31 coming into contact with the contact surface B of the engagement recess 20b, a force in the outer diameter direction acts on the claw 31b, and this force is applied to the end face of the elongated hole 31a of the switching plate 31. is received by contacting the interlocking shaft 15, and therefore, the switching plate 31 is stably held in this position.

Furthermore, since the gap C is set so that the claw 31b contacts only one of the contact surfaces A or B, even if the switching operation of the switching plate 31 is insufficient, the switching plate 31 will not allow the claw 31b to contact the contact surface. The claws 31b move in response to the force in the contacting direction, and the claws 31b are completely engaged with the engagement recesses 19b and 20b.

In addition, in the above-mentioned embodiment, both the engagement recesses 19b and 20
The contact surfaces A and B of b are formed parallel to the diameter line 0-0, but as shown in FIG.
1b, it goes without saying that the inner contact surface A may be configured to apply force to the inner diameter side, and the outer contact surface B may be configured to apply force to the outer diameter side.

As explained above, according to the present invention, the contact surface A of the inner engagement recess 19b is
1b in the inner radial direction, and the contact surface B of the outer engaging recess 20b generates a force in the outer radial direction on the claw 31b, so that even when vibration occurs such as when a torque limiter is activated, The pawls 31b are reliably and stably held in the predetermined engagement recesses, preventing the seedling stand 11 from being unable to be moved laterally due to gear shift failure, and eliminating the occurrence of missing plants, etc. Furthermore, even if the switching operation of the switching plate 31 is insufficient, the claw 31b automatically and completely engages with the engagement recess 19b or 20b during use, eliminating troubles caused by the half-engaged state. This can improve operability.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a rice transplanter to which the present invention can be applied, Fig. 2 is a sectional view showing a lateral feed adjustment device for a seedling stand according to the present invention, and Fig. 3 is a diagram showing a switching plate. is a front view, b is a longitudinal sectional view, FIG. 4 is a diagram showing the engagement recess, a is a front view showing the inner engagement recess, b is a front view showing the outer engagement recess, and FIG. A sectional view showing the operation, and FIG. 6 is a sectional view showing another embodiment. 1... Rice transplanter, 7... Planting rod, 15... Interlocking shaft, 19, 20... Rotating body (sprocket), 1
9a...Boss, 19b...Inner engagement recess, 20
a... Flange portion, 20b... Outer engagement recess, 31...
...Switching plate, 31b...Claw, A, B...Abutment surface.

Claims (1)

[Claims for Utility Model Registration] A plurality of other rotating bodies 20 are loosely supported on the boss 19a of the rotating body 19 from the interlocking shaft 15 that is linked to the planting rod 7, and are arranged in a superposed manner. In addition, one engagement recess 19b, 20b is provided at a predetermined location of the boss end of the rotary body 19 and a flange formed on one side of the rotary body 20, and the rotary bodies 19, 20 are loosely supported. A switching plate 31 having a claw 31b on the shaft 15 and biased toward the rotating body is provided so as to be slidable in the radial direction but not rotatable, and only when the engagement recesses 19b and 20b of the rotating body are aligned, Via a transmission device configured to be able to switch and engage with any one of these engaging recesses 19b, 20b and transmitting power by engaging the pawl 31b with one of these engaging recesses 19b, 20b. In a seedling stand lateral feed adjustment device configured to transmit power to a screw shaft 21 and to move the seedling stand 11 laterally by the screw shaft, the claw 31b of the switching plate 31 is
The contact surfaces A of the engagement recesses 19b and 20b that come into contact with,
B, the contact surface A of the inner engagement recess 19b is the claw 31.
A switching device in a transverse feeding adjustment device for a seedling stand, configured so that a force is generated in the inner radial direction on the outer engaging recess 20b, and a force is generated on the claw 31b in the outer radial direction.