JPH0430244B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a first gear and a second gear that have substantially the same root diameter and a slightly different number of teeth so that they can rotate integrally on the same axis, and , the reference gear teeth of both gears are arranged in parallel so that they match at the set phase, and the transmission gears are switched to the first and second gears at the set phase to selectively engage the two gears in the axial direction. The present invention relates to a transverse feed variable speed structure for a seedling stand of a rice transplanter, which is provided in a biasing operation mechanism that relatively switches and biases.

[Conventional technology]

In a general rice transplanter, the amount of seedlings to be planted in one planting operation of the planting arm is changed by changing the transverse feed speed of the seedling table. The switching operation of the lateral feed speed must be performed at the end of the lateral feed stroke of the seedling stand and at the set phase of the transmission. There is a structure in which a transverse transmission transmission is configured to switch at a set phase by utilizing the phase shift.

[Problem that the invention seeks to solve]

With the above structure, it is possible to simplify the structure of the stopper etc. that takes timing during switching operation, but for example, as shown in FIGS. 14 and 15,
When switching is performed by moving the first gear 20 and the second gear 21 together in the axial direction relative to the transmission gear 25, the angle at which switching can be performed near setting phase B is shown in FIGS. 14 to 15. reach (A′ ₁ +
_A2 ) Because of the extremely narrow range, if the transmission gear is rotating at a certain speed, it may not shift properly, which may cause problems with gear shifting operations.

An object of the present invention is to focus on this point and to provide a configuration in which even if the transmission system for transversely feeding the seedling tray is operating at a certain rotational speed, the speed change operation can be performed without any problem at the set phase.

[Means for Solving the Problems] The present invention is characterized in that in the above-mentioned transverse feed variable speed structure of the seedling bed of the rice transplanter, the first
The reference gear teeth of the gear and the second gear are made smaller and have substantially the same shape as the other gear teeth of the second gear,
The reason is that the lower rotation side of the gear teeth on the lower side in the rotational direction is set back from the reference gear teeth of the second gear, which has a smaller number of teeth, and its functions and effects are as follows.

[Effect]

For example, assume that the first and second gears of the transmission gear are shifted in the axial direction. First, as shown in FIG. 2, the transmission gear 25 and the first gear 20
When the biasing operation mechanism applies a biasing force downward in the plane of the paper to the first and second gears 20 and 21 from the state in which the gears are engaged and power is transmitted, the second
In the state shown in the figure, gear teeth 25a of the transmission gear 25
The side surface abuts the side surface of the gear tooth 21b of the second gear 21, and the second gear 21 cannot move toward the transmission gear 25 and engage.

However, as shown in FIG. 1, the reference gear teeth 20 in the set phase B of the first gear 20 and the second gear
a, 21a have the same shape and are smaller than other gear teeth 21c of the second gear 21, and are gear teeth 2 on the lower side in the rotational direction from the reference gear tooth 21a of the second gear 21.
Since the lower side of rotation 21d in 1b is moved backward, when the rotation reaches the state shown in FIG. do. This state continues until it rotates to the state shown in Figure 4.
The 1st and 2nd gears 2 are
0 and 21 are moved downward in the plane of the paper by the biasing force, and as shown in FIG. 5, the transmission gear 25 and the second gear 21 mesh to transmit power.

As mentioned above, the switchable range is the angular range (A ₁ +A ₂ ) from FIG. 3 to FIG. 4, and the angular range (A' ₁ +A ₂ ) of the conventional structure shown in FIGS. ). or,
This series of operations is the same when the transmission gear 25 is switched from a state in which it engages with the second gear 21 to a state in which it engages with the first gear 20.

〔Effect of the invention〕

As described above, it is possible to set a wide range of gear changes in the transverse feed variable speed structure of the seedling tray of the rice transplanter described above, and it is possible to set a wide range of gear changes, so that the gear changes can be performed reliably without malfunction even at normal operating speeds. As a result, the reliability of the transverse feed variable speed structure of the seedling stand has been improved.

〔Example〕

Hereinafter, a rice transplanter which is an embodiment of the present invention will be described based on the drawings.

As shown in FIG. 13, a seedling planting device 3 is connected to the rear of the wheeled traveling machine via a link mechanism 2 that is swing-operated by a hydraulic cylinder 1, and is movable up and down. The riding rice transplanter is configured such that the rice seedlings are transmitted to the seedling planting device 3 via the PTO shaft 4.

The seedling planting device 3 is provided with a planting arm 7, which is driven to swing up and down via a link mechanism 6 and has a planting claw 9 at the tip, at the rear of a transmission case 5 serving as a planting device body. A seedling platform 8 that feeds pine-shaped seedlings to the planting claws 9 while being reciprocated in the width direction of the machine in conjunction with the swinging movement of the planting arm 7, and a ground float 10 are provided at the bottom of the transmission case 5. The whole is composed.

The support structure of the seedling stand 8 will be described in detail. As shown in FIGS. 9 and 10, it includes a rail member 12 that partially forms a seedling supply port 11 and receives and supports the lower end of the seedling stand 8; The entire seedling stand 8 is supported on the transmission case 5 so as to be able to slide horizontally via the support 13, and both ends of the horizontal feed shaft 14 protruding left and right from the transmission case 5 are connected to a pair of left and right interlocking rods 15a, 1.
5b and a connecting rod 16 to the seedling stand 8.

The lateral movement of the seedling table 8 is carried out via the lateral movement shaft 14. To explain its structure in detail, as shown in FIG. A cylindrical shaft 17 fitted externally so as to be relatively rotatable is rotatably supported via a bearing 18, and a convex portion 19a of the cylindrical shaft 17 is fitted into the spiral groove 14a of the transverse feed shaft 14. The feeder 19 is attached and the cylindrical shaft 1
By rotationally driving 7, the transverse feed shaft 14 is configured to be fed and driven in the left-right direction. The driving force of the cylindrical shaft 17 is transmitted from the PTO shaft 4 to the input shaft 23 of the transmission case 5, the transmission shaft 24, and the transmission shaft 24 with a spline structure so that they can integrally rotate and slide in the axial direction, and have a large number of teeth. Slightly different first
Shift member 2 having gear 20 and second gear 21
2. The cylindrical shaft 17 is connected to the cylindrical shaft 17 via a transmission gear 25 having a pair of gears with the same number of teeth and fixed to the cylindrical shaft 17.
will be transmitted to.

The lateral feed speed of the seedling table 8 can be changed between high and low speeds by sliding the shift member 22 and engaging the first gear 20 with the transmission gear 25, or by engaging the second gear 21 with the transmission gear 25. By changing the lateral feed speed of the seedling platform 8, the amount of seedlings that the planting claws 9 take from the seedling supply port 11 changes. To explain in detail the operation system of this shift member 22, the sixth
As shown in the figure, a shifter support shaft 26 has a shifter 38 at one end, and a sleeve 42 is slidably fitted onto the other end of the shifter support shaft 26.
A biasing operation mechanism 40 having a spring 39 interposed therebetween causes the shift member 22 to be switched in the forward and reverse directions by the biasing force of the spring 39.

The switching movement of the shift member 22 described above is the same as that of the seedling stand 8.
A restraining structure is configured so that the cross-feeding is performed at the stroke end of the lateral feed and when the cylindrical shaft 17 is in the set phase, and the structure is shown in FIGS. 6 and 7 in detail. As shown in FIG. 2, the substantially arc-shaped stopper 27 which abuts against and prevents the shifter support shaft 26 from sliding is pivotally supported at the substantially center thereof around the support shaft 28, and one end of the stopper 27 is supported by the helical spring 33. A plate member 36 provided on the shifter support shaft 26 is urged to swing out of the movement trajectory.

Normally, the stopper 27 comes into contact with the plate 36, as shown in FIG. 7, and prevents the shifter support shaft 26 from sliding, that is, the switching operation of the shift member 22, and the stopper 27 maintains this position. is the 6th
As shown in FIG. 7 and FIG. 7, the operating arm 30 of the stopper 27 comes into contact with the disc-shaped restraining member 31 provided on the operating rod 32 arranged parallel to the transverse feed shaft 14, and the cylindrical shaft 17 Provided cam member 2
9 and the convex portion 27a of the stopper 27, the posture of the stopper 27 is maintained, and the operating rod 32 is urged back to the abutting operating position ON by a pair of springs 34. There is. When the seedling table 8 reaches the stroke end of the horizontal feed, the operating parts 37a and 37b provided near both ends of the reinforcing rod 37 shown in FIG. When the cam member 29 moves to the positions OFF ₁ and OFF ₂ , and the convex portion 27a fits into the recess 29a corresponding to the phase range including the set phase B, the aforesaid contact is released and the stopper 27 moves to the position shown in FIG. It separates from the plate 36 as shown.

FIG. 6 shows a state in which the second gear 21 of the shift member 22 and the transmission gear 25 are engaged, but at this time, the shift member 22 is immediately moved by the urging force of the urging operation mechanism 40, and the second gear 21 and transmission gear 25
The gear structure to which the present invention is applied is explained in detail.As shown in FIG. 2 gear 21
are the reference gear teeth 20 of both gears 20 and 21.
a and 21a are arranged so as to overlap at the set phase B, and the second gear 21 is configured as a shifted gear. Then, the reference gear teeth 2 of the second gear 21
1a is smaller than other gear teeth 21c of the second gear 21, has the same shape as the reference gear tooth 20a of the first gear 20, and has a lower rotational position in the gear tooth 21b on the lower side in the rotational direction from the reference gear tooth 21a. side 21d
has been set back. Then, the shift member 22 is moved by the biasing force from the biasing operation mechanism 40 in the angular range (A ₁ +A ₂ ) from FIG. 3 to FIG.
The gear 21 and the transmission gear 25 mesh with each other. The details of this operation are as described in the above-mentioned [Operation] section.

Also, as shown in Fig. 6 and Fig. 11 A and B,
When the shift member 22 is moved from its normal engaged position (in the figure, the transmission gear 25 of the second gear 21 is engaged) by the biasing force and the engagement is switched, the shift member 22 is moved from the normal position in which it is engaged (in the figure, the transmission gear 25 of the second gear 21 is engaged) and the engagement is switched. , b), the first gear 20 and the second gear 2 temporarily shift during the operation.
The intervals between the respective gears are set so that the transmission gears 1 and 25 simultaneously engage with the transmission gear 25, thereby preventing a neutral state in which no power is transmitted from occurring during operation.

When the shifting operation by the shift member 22 is completed as described above and the cylindrical shaft 17 further rotates from the set phase B, the cam member 29 provided on the cylindrical shaft 17 and the protrusion near the center of the stopper 27 as shown in FIG. The stopper 27 is moved by the cam action with the portion 27a.
again enters the path of the plate 36 and prevents the switching operation.

[Brief explanation of drawings]

The drawings show an embodiment of the transverse feed variable speed structure of a rice transplanter's seedling stand according to the present invention, FIG. 1 is a front view of the first and second gears showing an outline of the present invention, and FIG. A diagram showing the state before switching from 1st gear to 2nd gear, Figure 3 is a diagram showing the rotational phase where a state in which the occlusal state can be switched begins to appear, and Figure 4 is a diagram when the occlusal state is switched. Fig. 5 is a diagram showing a state in which the transmission gear and the second gear are in mesh with each other when the engagement state has been changed, and Fig. 6 is a cross-sectional plane of the transverse feed transmission section. figure,
Fig. 7 is a vertical cross-sectional side view showing the state in which the stopper abuts and prevents the shifter support shaft;
A longitudinal cross-sectional side view showing a state in which the contact prevention state in the figure is released, FIG. 9 is a side view of the vicinity of the seedling rest support part, and FIG. 10 is a plan view of the vicinity of the seedling rest support part.
Figures 11A and 11B are a side view and a cross-sectional plan view showing the state in which the transmission gear and the second gear are engaged;
Figures 2A and 2B are a side view and a cross-sectional plan view showing the state in the middle of the transition from the state shown in Figure 11A and 2B to the state in which the first gear engages, and Figure 13 is an overall side view of the riding rice transplanter. , FIG. 14, and FIG. 15 are front views of gears showing the conventional structure. 20...First gear, 21...Second gear, 20
a, 21a...Reference gear teeth, 21b, 21c...
Gear teeth, 21d...Rotating lower side, 25...Transmission gear, 40...Biasing operation mechanism, B...Setting phase.

Claims (1)

[Claims] 1. The first gear 20 and the second gear 21 having substantially the same root diameter and slightly different numbers of teeth can be integrally rotated on the same axis, and the reference gear teeth 20 of both gears 20 and 21 are provided.
a, 21a are arranged side by side so that they coincide at the set phase B, and the transmission gear 25 switches to the first and second gears 20, 21 at the set phase B to selectively engage the two gears. This is a transverse feed variable speed structure for a rice transplanter's seedling stand, which is provided with an urging operation mechanism 40 for relatively switching and urging in the direction, and the reference gear teeth of the first gear 20 and the second gear 21 in the setting phase B. The reference gear teeth 21 of the second gear 21 have a smaller number of teeth and have substantially the same shape as the other gear teeth 21c of the second gear 21.
Transverse feed speed change structure of a seedling stand of a rice transplanter, in which a lower rotational side surface 21d of a gear tooth 21b on the lower rotational direction is set back from a.