JPH0444020Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is equipped with a gear transmission for driving the lateral feed of a seedling stand, and the shift gear member of this gear transmission is operated to switch between forward and reverse shifting directions. The present invention relates to a transverse feed variable speed structure for a rice transplanter that changes the transverse feed speed of a seedling feeder.

[Conventional technology]

To change the number of seedlings that can be planted in one planting operation of the planting arm of a rice transplanter, that is, to change the number of times seedlings are taken out in one horizontal feed, change the horizontal feed speed of the seedling platform. To do something.

In this case, for example, as disclosed in Japanese Utility Model Publication No. 53-46180, a shift gear member for changing the transverse feed speed of the seedling stand is held in contact with a stopper at the speed change position, and a spring (energizing operation (equivalent to a mechanism)
Some devices are equipped with a structure that biases the gear toward a desired shift position.

When the seedling stand reaches the stroke end of the lateral movement, the stopper is operated to the contact release side, and the shift gear member is suddenly switched to the desired shift position by the biasing force of the spring.

In this way, the reason why the shift gear member is switched at the end of the stroke of the horizontal feed of the seedling stand is that the stroke end of the horizontal feed is at the same position before and after changing the number of times the seedlings are taken out.

[Problem that the invention attempts to solve]

However, strictly speaking, the common position before and after changing the number of times the seedlings are taken out does not have width in the front and back, but is a single point with no width, and the common position is when the seedling tray is completely horizontally fed. This is the position where the stroke end is reached and the stroke stops momentarily.

In this case, in the conventional structure described above, the stopper begins to be pushed toward the contact release side a little before the seedling rest reaches the stroke end of the lateral feed, so that the seedling rest reaches the stroke end of the complete lateral feed. In this case, it cannot be said that the contact release operation of the stopper and the switching operation of the shift gear member are performed.

In this way, if the shift gear member is switched at a position other than the stroke end of the complete lateral movement of the seedling tray, the number of seedlings corresponding to the shift position of the shift gear member will be adjusted by the planting arm during lateral movement. However, at the stroke end of the lateral feed, the end of the pine-shaped seedlings and the planting arm do not match, and the number of seedlings corresponding to the above-mentioned speed change position may not be taken out by the planting arm.

The object of the present invention is to configure the shift gear member so that the switching operation of the shift gear member is performed as much as possible at the end of the stroke of complete lateral movement of the seedling stand.

[Means for solving problems]

The feature of the present invention is that the above-mentioned transverse feed variable speed structure of the seedling stand of the rice transplanter is configured as follows. In other words, it is equipped with a gear transmission for driving the lateral feed of the seedling bed, an urging operation mechanism that switches and biases the shift gear member of this gear transmission in forward and reverse shifting directions, and a biasing operation mechanism that holds the shift gear member in contact with each other at the shifting position. a stopper that abuts and prevents movement in the biasing direction; a release operation means that operates the stopper to the contact release side; and when the seedling platform reaches the end of the horizontal feeding stroke, the release operation means is activated. When the rotation angle of the rotating shaft for horizontal feeding of the seedling tray reaches the set angle, the second restraining device allows the operation of the release operation means, and the second restraining device allows the seedling tray to move from the end of the horizontal feeding stroke. If it comes off, the stopper is provided with an abutting operation means for operating the stopper to the abutting side, and a tapered part that guides the engagement of the stopper into the abutting position is moved from at least one of the stopper or the abutting part on the shift gear member side. It is provided in

[Effect]

() With the above-described configuration, as shown in FIGS. 1 to 2, for example, when the seedling stand reaches the end of the stroke of horizontal feeding, the first restraining means 31 first releases the stopper 27. By means of the means 33, it becomes possible to operate to the contact release side. However, in this state, the second check means 2 is still
Due to the action of 9a, the stopper 27 cannot be operated to the contact release side.

In this case, the position where the seedling rest reaches the stroke end of complete lateral feeding and stops momentarily (the common position before and after changing the number of seedlings to be taken out) is one rotation of the rotation shaft 17 for the seedling rest. It is located at a location corresponding to a certain setting angle.

Therefore, when the rotating shaft 17 reaches this set angle, as shown in FIG. It is operated to the contact release side. As a result, at the end of the stroke of substantially complete lateral movement of the seedling stand, the shift gear member is switched all at once by the urging operation mechanism.

() If the switching operation of the shift gear member is performed as described above and the seedling stand is removed from the stroke end of the horizontal feed, as shown in FIGS. 3 to 1, the contact operation means 29 The stopper 27 is operated to the contact side.

In this way, once the switching operation of the shift gear member is completed, by operating the stopper to the contact side, the shift gear member will not be switched inadvertently during planting work etc. .

() When the stopper is quickly moved to the contact side after switching the shift gear member, even if the shift gear member is slightly deviated from the normal shifting position, the tip of the stopper will easily return to the contact position due to the action of the tapered part. Since it can be inserted into the stopper, the stopper can be quickly moved to the contact side without delay.

[Effect of idea]

As described above, by providing the restraint for the stopper in two stages, it is possible to configure the shift gear member to be switched at the end of the stroke of almost complete traverse movement of the seedling stand, and to do so. It was possible to prevent a situation in which the number of seedlings taken out by the arm differs between the stroke end and the middle of the horizontal feed.

By operating the stopper to the contact side except when switching the shift gear member, it is possible to prevent the shift gear member from being switched inadvertently, and it is possible to improve the reliability of horizontal feeding of the seedling stand. .

Even if the shift gear member deviates slightly from the normal shift position, the stopper can be quickly operated to the contact position without any trouble due to the action of the tapered part, so the operation of the stopper to the contact side and the shift structure for lateral movement are reliable. Sexuality also improves.

〔Example〕

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

As shown in FIG. 9, a seedling planting device 3 is connected to the rear part of a wheeled traveling body through a link mechanism 2 that is operated to swing up and down depending on the position of a hydraulic cylinder, so as to be raised and lowered. A riding-type rice transplanter is constructed in such a way that power from a traveling machine is transmitted to a seedling planting device 3 via a PTO shaft 4.

In the seedling planting device 3, a planting arm 7 is attached to the rear of a transmission case 5 serving as a body of the planting device so as to be driven to swing up and down via a link mechanism 6, and a planting arm 7 is provided at the tip of the planting arm 7. A seedling pedestal 8 is provided on the front end side of the transmission case 5 to supply seedlings to the planting claw 9 while being reciprocated in the width direction in conjunction with the seedling planting movement of the planting claw 9. A grounding float 10 is attached.

The reciprocating structure of the seedling stand 8 will be explained.
As shown in FIG. 7, a rail member 1 is provided with a seedling supply port 11 and receives and supports the lower end side of the seedling stand 8.
2 and a support 13, a seedling stand 8 is attached to the transmission case 5 so as to be able to move laterally. As shown in FIGS. 4, 7, and 8, the transverse feed shaft 14 is connected to the seedling stand 8 through a pair of interlocking rods 15a, 15b and a rod 16 so as to move integrally therewith. A transverse feed shaft 14 is slidably attached to the transmission case 5 via a rotatable cylindrical shaft 17 (corresponding to the rotating side) and a bearing 18.
Then, the feeder 19 of the transverse feed shaft 14 is attached to the cylindrical shaft 17 with its protrusion 19a entering the spiral groove 14a of the transverse feed shaft 14, thereby configuring the transverse feed mechanism 41 of the seedling stand 8. .

Then, the large-diameter gear 20 and the small-diameter gear 21 are attached to the cylinder shaft 17, and the large-diameter and small-diameter gears 20,
A shift gear member 22 that can engage with the transmission case 5 is attached to the transmission shaft 24 for the planting arm 7, which is gear-linked to the input shaft 23 of the transmission case 5, so that it can rotate and slide freely as a unit with a spline structure. Mechanism 41
A gear transmission 25 capable of two-stage shifting is configured. Specifically, the rotational force of the power transmission shaft 24 is transferred to the cylindrical shaft 1 by the gear transmission 25.
7, the feeder 19 is rotationally driven, so that the seedling stand 8 is reciprocated in conjunction with the seedling planting movement of the planting claws 9.

As shown in FIG. 4, a sleeve 42 is slidably attached to the other end of the support shaft 26 having a shifter 38 at one end.
A biasing operation mechanism 40 is fitted onto the outside and a spring 39 is interposed between the sleeve 42 and the support shaft 26.
As a result, the shift gear member 22 is operated. By this biasing operation mechanism 40, the shift gear member 22
By operating the gear transmission 25 and changing the speed of the gear transmission 25, the moving speed of the transverse feed shaft 14 changes, and the amount of seedlings supplied in the width direction of the seedling platform 8 changes.

As shown in FIGS. 4 and 1, the support shaft 26,
and a releasable stopper 27 that acts on the shift gear member 22 via the shifter 38, and acts on a convex portion 27a provided on this stopper 27 to swing the stopper 27 around the axis of the rotation support shaft 28. A check that acts on the rotating cam 29 (corresponding to the contact operating means) attached to the cylinder shaft 17 and the operating arm 30 extending from the vicinity of the base of the stopper 27 to prevent the stopper 27 from shifting to the contact release state. Member 31 (corresponding to the first restraining means), stopper 2
Spring 33 that swings and urges 7 toward the contact release side
(corresponding to a release operation means), a pair of springs 34 that bias the restraining member 31 to the operating position (ON) via the operating rod portion 32 of the restraining means 31 are connected to the shift restraining mechanism 35 of the gear transmission 25. has been configured.

When the check member 31 is in the operating position (ON), as shown in FIG.
0 is moved away from the cylinder shaft 17 against the spring 33 to receive and support the stopper 27, and the free end side of the stopper 27 enters the movement path of the contact portion 36 attached to the support shaft 26. It is becoming. As a result, the stopper 27 acts on the contact portion 36 so that the shift gear member 22 cannot be slid from the high speed position or the low speed position.

When the seedling platform 8 reaches the stroke end of the horizontal feed and the restraining member 31 is slid to the action release position (OFF ₁ ) or (OFF ₂ ), the second
As shown in the figure and FIG. 3, the check member 31 is removed from the operating arm 30, and the operating arm 30 is operated by the spring 33 toward the side approaching the cylinder shaft 17. However, when the cylinder shaft 17 is rotated at a rotation angle other than the set angle,
When the feeder 19 is present, the convex portion 27a is received and supported by the outer circumferential surface of the rotating cam 29, as shown in FIG. The shift gear member 22 is kept in the abutting state in which the shift gear member 22 cannot be slid.

When the cylinder shaft 17 and the feeder 19 rotate to the set angle, the convex portion 27a enters the concave portion 29a (corresponding to the second restraining means) of the rotary cam 29, as shown in FIG. The shift gear member 22 is switched to the released state in which the shift gear member 22 is removed from the movement path of the shift gear member 22, thereby allowing the shift gear member 22 to slide.

As shown in FIGS. 1 and 5, the distal end of the stopper 27 is provided with a tapered portion 43 so that the stopper 27 can easily enter the abutment position where the shift gear member 22 is prevented from moving. In this way, the timing of the gear change operation is set by the biasing force of the biasing operation mechanism 40 and the stopper 27 described above.

As shown in FIG. 8, a pair of arm-type operation parts 37a and 37b for operating the restraining member 31 to the release position (OFF ₁ ) and (OFF ₂ ) are connected to an interlocking rod so as to move together with the seedling stand 8. A reinforcing rod 37 is installed and connected to 15a and 15b. And seedling stand 8
One operating section 37a is operated only when the left side is at or near the end of the traversal stroke, and the other operating section 37b is attached to the operating rod section 32 only when the side is at or near the end of the right side traversing stroke. The contact member 31 is released from action (OFF ₁ )
or (OFF ₂ ).
The speed change operation of the gear transmission 25 is possible only when the seedling platform 8 is at the left or right side lateral feed stroke end and the cylinder shaft 17 and feeder 19 are at the set angle as described above. The whole thing is structured so that.

Specifically, as shown in FIG. 6, the spiral groove 14a
A protrusion 19a is provided on a curved portion 49 connecting the forward side portion 47 of the seedling platform and the backward side portion 48 of the seedling platform.
The check member 31 is operated to the action release position (OFF ₁ ) or (OFF ₂ ) only _when
The stopper 27 is operated to the contact release state only in the state where a is present.

As described above, the stopper 27 is operated to the contact release side and the biasing operation mechanism 40 is operated to slide the shift gear member 22, and when the seedling tray 8 leaves the stroke end of the horizontal feed, the cylinder axis 1
7 and the rotary cam 29, the stopper 27 enters the movement path of the abutting portion 36, as shown in FIGS. 3 to 1, and is brought into contact again.

[Another example]

In the above embodiment, the tapered portion 43 is provided on the stopper 27, but the tapered portion 43 may be provided on the contact portion 36 as shown in FIG.

[Brief explanation of the drawing]

The drawings show an embodiment of the transmission structure for transversely feeding the seedling tray of a rice transplanter according to the present invention, and Figures 1, 2, and 3 are longitudinal cross-sectional side views of the vicinity of the stopper, and Figure 4 is a front view of the transmission and transmission control mechanism. , Fig. 5 is an enlarged front view of the vicinity of the contact part, Fig. 6 is an explanatory diagram of the end of the spiral groove, Fig. 7 is a side view of the vicinity of the support part of the seedling rest, and Fig. 8 is an illustration of the transverse feed mechanism of the seedling rest. A plan view, FIG. 9 is an overall side view of a riding-type rice transplanter, and FIG. 10 is an enlarged front view of the vicinity of the contact portion showing another embodiment. 8... Seedling stand, 17... Rotating shaft, 22... Shift gear member, 25... Gear transmission, 27... Stopper, 29... Contact operation means, 29a... Second check means, 31... ...first check means, 33...release operation means, 36...abutment part,
40...Biasing operation mechanism, 43...Tapered portion.

Claims (1)

[Scope of utility model registration request] This gear transmission 2 is equipped with a gear transmission 25 for horizontally feeding the seedling table 8.
a biasing operation mechanism 40 that switches and biases the shift gear member 22 of No. 5 in the forward and reverse shift directions; and a stopper 27 that abuts and holds the shift gear member 22 at the shift position and prevents movement in the biasing direction. , a release operation means 33 for operating the stopper 27 to the contact release side; a first check means 31 for allowing the release operation means 33 to operate when the seedling platform 8 reaches the stroke end of horizontal feeding; When the rotation angle of the rotation shaft 17 for horizontal feeding of the seedling resting table 8 reaches the set angle, the second restraining means 29a that allows the release operation means 33 to operate, and the second restraining means 29a that allows the seedling resting table 8 to move from the stroke end of the horizontal feeding. If the stopper 27 comes off, the stopper 27 is provided with an abutment operation means 29 for operating the stopper 27 to the abutment side, and the tapered portion 43 for guiding the engagement of the stopper 27 into the abutment position is moved to the stopper 27 or the shift gear member 22 side. A transversal speed change structure for a seedling stand of a rice transplanter provided on at least one of the abutting parts 36.