JPH08266118A - Seedling transverse feeder in seedling transplanter - Google Patents

Abstract

PURPOSE: To enable a transverse transferring speed of a seedling-loading stand to be readily changed to more than three stages in a seedling transplanter. CONSTITUTION: When a seedling-loading stand is midway of transverse transferring in an operation of a speed-varying lever, a gear transmission 30 does not change speed because of a placing action of a stopper 52 to a shift shaft 36 for the sake of a first rotating cam 61 gearing with a second rotating cam 62. When the seedling-loading stand attains to a transverse transferring stroke end, the stopper 52 releases the placing action to the shift shaft 36 and controls a stroke so as to change only one pitch to the shift shaft 36, then the shift shaft automatically slides only one pitch. In every attaining of the seedling- loading stand to the transverse transferring stroke end, the shift shaft 36 automatically changes at every one pitch, and the gear transmission 30 attains to a prescribed speed-changing objective speed stage after the seedling-loading stage attains to the transverse transferring stroke end in the number equal to the speed changing stages number to change the gear transmission 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seedling placing table on which mat-like seedlings to be supplied to seedling placing nails are placed, and the seedling placing table is moved laterally of the machine body in association with the seedling planting movement of the seedling placing nails. The present invention relates to a seedling lateral feeding device for a seedling planting device including a lateral feeding drive mechanism that reciprocates.

[0002]

2. Description of the Related Art In the above-mentioned seedling lateral feeding device, as disclosed in, for example, Japanese Patent Laid-Open No. 6-153636,
Equipped with a variable speed section that switches the lateral feeding speed of the seedling placing table in four stages, the number of times the seedling planting claws cut the mat-shaped seedlings into a plurality of block seedlings in the lateral width direction and take out the seedlings can be changed in four stages. There is one that can switch the size of one seedling in the lateral direction on the seedling mounting table to four types. If the seedling tray has not reached the horizontal feed stroke end and the number of seedlings is changed by switching the shifting part at the timing during the horizontal feed, the seedling horizontal feed speed after this change will be more than that before the change. To get faster and slower,
In some cases, seedling supply defects occur in which the lateral length of the seedlings taken out from the final lateral end of the mat-like seedlings is smaller than that of the seedlings taken up to that point. For this reason, conventionally, for example, an engaging member mounted so as to rotate integrally with the rotary operation shaft of the transmission unit, and a member that is slidably fitted onto the seedling table horizontal feed shaft and laterally moves together with the seedling table. When the seedling placing table is in the middle of feeding to the end of the lateral feed stroke, the gear shift section is switched so that the engaging member and the engaged member mesh with each other and the rotary operation shaft cannot be operated. By providing a restraint mechanism configured to restrain, the shift unit can be switched and operated only when the seedling placing table is at the lateral feed stroke end.
The number of seedlings was changed while avoiding the poor seedling supply.

[0003]

Conventionally, when changing the number of seedlings to be taken, it is necessary to check the position of the seedling mounting table in the lateral feed, or to operate the rotary operation shaft of the speed change unit. It was necessary to check whether or not the platform was at the lateral feed stroke end, confirm that it was at the stroke end, and then perform the switching operation of the transmission section as the operation for changing the number of seedlings. Also, if the seedling placing table is not at the lateral feed stroke end, it is necessary to wait for the timing to reach the stroke end and switch the transmission section before switching the transmission section. Other than the switching operation of, it took a lot of troublesome work such as checking and waiting for timing. An object of the present invention is to provide a seedling lateral feeding device for a seedling planting device, which can easily change the number of seedlings to be taken in three or more steps while avoiding the occurrence of poor seedling supply.

[0004]

In order to achieve the object, the present invention is characterized by the following points in the seedling lateral feeding device of the seedling planting device described at the beginning. The lateral feed drive mechanism is provided with a speed change unit that switches the lateral feed drive speed of the seedling placing table in three or more stages, and a gear shift lever that sets a gear shift target speed stage at which the gear shift unit is to be switched is provided. As the target speed stage is set, a shift operation force for switching the transmission unit to the set shift target speed stage is generated and applied to the operation unit of the transmission unit,
Further, a shift operation force generation unit that releases application of a shift operation force to the operation unit when the shift unit switches to the set shift target speed stage is provided, and a positioning mechanism for the operation unit is provided with the shift operation force generation unit. Of operating the operating portion at each of the gear shift operation positions against the gear operating force of the gear, and allowing the operating portion to be switched by the gear operating force of the gear operating force generating portion. The positioning mechanism is in the working state until the seedling placing table reaches the end of the lateral feeding stroke by interlocking the positioning mechanism and the lateral feeding driving mechanism so that the positioning mechanism can be switched to the released state. When the platform reaches the end of the lateral feed stroke, the positioning mechanism is configured to automatically switch to the operation release state, and the operation section When a switching operation is performed by the shift operation force of the power generation unit, a stroke restriction mechanism is provided for restricting a stroke for moving the operation unit to a stroke in which the speed change unit shifts only one step. .

[0005]

When the gear shift lever is operated to set the gear shift target speed stage, the gear shift operation force generation unit generates a gear shift operation force and applies it to the operation unit of the gear shift unit. At this time, if the seedling mounting table is at the end of the lateral feed stroke, the positioning mechanism is switched to the released state and the operation unit is allowed to switch. Switch by. If the seedling stand is in the middle of horizontal feed until the end of the horizontal feed stroke,
Since the positioning mechanism is in the operating state and the operating portion is positioned at the gear shifting operation position before the gear shifting operation, the gear shifting operation force generation portion applies the gear shifting operation force to the manipulation portion, but the manipulation portion does not If the seedling placing table is traversed and reaches the stroke end without switching, the positioning mechanism switches from the operating state to the operating release state and switches the operating section. In order to allow, the operating portion is automatically switched by the shift operating force generated by the shift operating force generating portion. When the gear shift target speed stage set by the gear shift lever is a gear shift target speed stage for changing only one stage from the speed stage before the gear shifting operation, switching of the operating unit causes the gear shifting unit to shift to the set gear shifting. At the same time as switching to the target speed stage, the application of the speed change operation force by the speed change operation force generation unit is released, and the switching control of the speed change unit is completed. When the gear shift target speed stage set by the gear shift lever is a gear shift target speed stage for changing from the speed stage before the gear shift operation to two or more stages, the first switching movement of the operating portion after the gear shift operation is stroke regulation. Due to the Slotalk restriction by the mechanism, only one-step speed change is completed, and the speed change part only changes from the speed step before the gear change operation to the speed step changed by one step, and it reaches the speed step of the gear change target speed step. After that, the positioning mechanism switches from the operating state to the operating release state each time the seedling placing table is further fed laterally to reach the stroke end, and the stroke restricting mechanism is activated. In order to regulate the movement stroke of the operation section, the operation section uses the shift operation force generated by the shift operation force generation section to move the movement step for one-step shifting. Only the low speed is automatically switched, and the pitch of the operating part is repeatedly changed by the number of times equal to the number of speed difference between the speed stage before the gear shifting operation and the set target gear speed stage, and the gear shifting part shifts. Switch to the speed stage corresponding to the target speed stage.

According to the second aspect of the present invention, the artificial operation force applied to the shift lever is accumulated in the shift spring as the elastic restoring force of the shift spring, and the elastic transmission force is used as the shift operating force to switch the gear transmission. It becomes possible to perform a desired transverse feed speed change while being constituted by mechanical means.

[0007]

[Effects of the Invention] Since the lateral shifting of the seedling placing table can be performed by the shifting portion that can be switched in three or more steps, one seedling can be selected from large, medium and small sizes according to the seedling density of the mat-like seedling. If the gear shift lever operation is performed as a switching operation while the planting work can be performed by switching the seedling lateral width to three or more, such as by adjusting to It does not switch until it reaches the straw end, but it automatically switches only when it reaches the stroke end, so the seedling table does not change in speed during horizontal feeding, and from the final lateral edge of the mat-shaped seedling. With the extremely small width, block seedlings with only bed soil were taken out, and planting work without missing plants became possible by avoiding the occurrence of seedling supply failure described at the beginning.
In addition, the gear shifting operation for adjusting the seedling picking amount is advantageous in terms of operation so that the seedling placing table can be operated either at the stroke end or during the horizontal feeding.

According to the second aspect of the present invention, since the entire apparatus can be configured by mechanical means, an electric sensor for detecting the operation position of the gear shift lever, and a control mechanism based on the detection result of the sensor, the electric actuator for operating the gear shift portion. Can be obtained at a lower cost or in a more durable manner as compared with the case of being constituted by electric means so as to switch the transmission section by operating.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a driver cylinder having a driver seat SE, a work monitor M and the like, a rear portion of a riding type traveling machine equipped with an ultrasonic sensor S and the like are vertically rocked by a lift cylinder LC. The seedling planting device T is connected to the seedling planting device T via the swingable link mechanism 1 and the power is transmitted from the traveling machine body to the seedling planting device T via the rotary shaft 2. Then, a riding type rice transplanter is configured.

In constructing the seedling planting apparatus T, a plurality of seedling planting mechanisms 4 arranged in parallel in the lateral direction of the planting machine body 3 are attached to the rear part of the planting machine body 3, and seedling planting mechanisms 4 are supplied to these seedling planting mechanisms 4. Seedling stand 5
Is provided on the front side of the seedling planting mechanism 4, and the planting machine body 3
A plurality of grounding floats 6 arranged in parallel in the lateral direction on the lower side of the aircraft
Is attached.

The ultrasonic sensor S and the work monitor M are linked to a planting control mechanism (not shown) composed of a micro computer. That is, when performing a planting run before the ridge, the ultrasonic sensor S detects the distance from the aircraft to the ridge, and the planting control mechanism leaves the detection result by the ultrasonic sensor S and the seedling not planted on the ridge. Based on the required lateral width of the planned traveling location, it is determined whether or not it is necessary to perform a small number of planting work for stopping the driving of a part of the plurality of seedling planting mechanisms 4, and the small number of planting is performed. When it is necessary to perform work, which of the plurality of seedling planting mechanisms 4 is to be stopped is determined. Then, the work monitor M displays whether or not it is necessary to carry out the small number planting work, and when it is necessary to carry out the small number planting work, which of the plurality of seedling planting mechanisms 4 should be stopped. Is displayed. In other words, when performing the planting work in front of the ridge, the small number planting clutch is manually operated according to the display by the work monitor M to manually perform the small number planting work. Then, when the ridges are next planted and run, the planting work can be carried out without stepping on the wheels with the planting seedlings planted in the previous work. still,
In this case, which work of the seedling planting mechanism 4 should be stopped is displayed by the work monitor M, and when the planting control mechanism determines that a small number of planting work should be performed, the minority planting clutch is automatically operated. It may be configured and implemented so that the driving of the predetermined planting mechanism 4 is stopped by performing a manual cutting operation. Then, it becomes possible to work more easily without the need for the operation of disengaging the small number of planting clutches.

As shown in FIGS. 1 and 8, each of the plurality of seedling planting mechanisms 4 is a transmission case 4a which is attached to the planting machine body 3 so as to be rotatable around a lateral axis of the machine body.
And a planting arm 4b attached to both ends of the transmission case 4a so as to be rotatable around an axis parallel to the rotation axis of the transmission case 4a. Transmission case 4
When a is rotationally driven, a drive mechanism (not shown) built in the transmission case 4a causes a pair of planting arms 4b,
By driving 4b so as to rotate with respect to the transmission case 4a, the pair of planting arms 4b, 4b rotate about the transmission case 4a while rotating, and the rotation axis of the transmission case 4a with respect to the planting machine body 3. Revolve around the core,
The seedling planting claws 4c provided on the pair of planting arms 4b, 4b alternately pass through the seedling supply port 7a provided on the seedling platform supporting rail 7 as shown in FIG. Thereby, a plurality of seedling planting mechanisms 4
Each pair of seedling planting claws 4c, 4c are alternately cut to cut one block of seedlings from the lower end of the mat-like seedling N placed on the seedling placing table 5 at the seedling supply port 7a. While holding the block seedlings, the seedlings are descended and planted in the field mud, and the seedling planting movement is performed so as to return from the field mud to the upper side of the seedling supply port 7a.

The seedling table 5 is supported in a tilted position so that the lower end of the table 5 is located rearward of the planting machine body 3.
Support the planting machine 3 to slide laterally,
The seedling lateral feeding device having the lateral feeding driving mechanism 10 shown in FIGS. 2 and 3 causes the seedling placing table 5 to interlock with the seedling planting movement of the seedling planting claws 4c by the action of the lateral feeding driving mechanism 10. The mat-shaped seedlings placed on the seedling mounting table 5 are reciprocally transferred to the seedling supply port 7a by reciprocatingly transferring the seedling machine body 3 laterally with respect to the support rails 7. As a result, the seedling planting claws 4c sequentially cut the lower end portion of the mat-shaped seedling from the left end to the right end or from the right end to the left end to obtain a lateral length of the seedling placement table determined by the lateral feeding speed of the seedling placement table. Take out the block seedlings you have. The mat-like seedlings placed on each of the plurality of seedling placing portions 5a provided on the seedling placing table 5 so that the plurality of mat-like seedlings to be individually supplied to the plurality of seedling planting mechanisms 4 are placed. Is provided with a pair of vertical seedling feeding belts 8 as an example of a vertical seedling feeding device for moving the seedlings to the seedling supply port 7a in the vertical direction of the seedling placing base 5, and the seedling placing base 5 reaches the left and right lateral feed stroke ends. Then, seedling planting nail 4c
When the seedlings are taken out from the final lateral end of the mat-shaped seedling lower end, the vertical feed drive mechanism 20 including the seedling vertical feed shaft 21 shown in FIG. 2 rotates the seedling vertical feed belt 8 each time. By driving, the mat-shaped seedlings of each seedling placing portion 5a are vertically fed toward the seedling supply port 7a by a length equal to the length in the vertical direction of the seedling placing base of the taken-out seedling by the planting claw 4c. . As a result, even if the seedling placing table 5 reaches the lateral feed stroke end and its lateral feed direction is opposite to the lateral feed direction up to that point, the seedling planting claws 4 continue to be used.
c sequentially cuts the lower end of the mat-like seedling from the left end to the right end or from the right end to the left end to take out a block seedling having a predetermined lateral length on the seedling platform. Therefore, when the mat-like seedlings are placed on the seedling placing portions 5a of the seedling placing table 5 and the work is run, the seedling planting claws 4c of the respective seedling planting mechanisms 4 take out block seedlings of a predetermined size from the matte seedlings. It will be planted in the field.

As shown in FIGS. 2 and 3, the lateral feed drive mechanism 10 is connected to the seedling placing table 5 via the attachment member 11 and the attachment position adjusting screw 12 so that the lateral feeding drive mechanism 10 can be moved left and right together with the seedling placing table 5. The seedling platform horizontal feed member 13 configured as described above, and the transmission case portion 3a and the support arm portion 3b of the planting machine body 3 configured to penetrate the seedling platform horizontal feed member 13 in a relatively slidable and relatively rotatable manner. The seedling table horizontal feed shaft 14 rotatably attached to the seedling table, a shaft end portion 14a of the seedling table horizontal feed shaft 14 located inside the transmission case portion 3a, and the shaft inside the transmission case portion 3a. It is constituted by a gear transmission 30 provided between the end portion 14a and the planting drive shaft 15 positioned in parallel or substantially in parallel. The planting drive shaft 15 is interlocked with the transmission shaft 2 via the bevel gears 16a and 16b and is rotationally driven. The transmission gears 17a and 17b, the rotary shaft 1
8, through the transmission chain 19 planting mechanism drive shaft 4d
The rotation power is transmitted to drive all the planting drive mechanisms 4. The gear transmission 30 transmits the turning force of the planting drive shaft 15 to the shaft end portion 14a to rotationally drive the seedling table horizontal feed drive shaft 14. When the lateral feeding drive shaft 14 of the seedling placing table rotates, the lateral feeding spiral groove 14b
Feeding piece 13 having a protrusion slidably inserted in
By providing a in the seedling platform lateral feed member 13,
The seedling platform horizontal feed drive shaft 14 reciprocates the seedling platform horizontal feed member 13. As a result, the lateral feed drive mechanism 10 reciprocally transfers the seedling placing table 5 in the lateral direction of the machine in synchronization with the seedling planting movement of the seedling planting claws 4c.

As shown in FIG. 2, the vertical feed drive mechanism 20 is constructed so as to support all the seedling vertical feed belts 8 on the lower end side of the seedling mount via belt wrapping wheels (not shown). Then, one seedling vertical feed shaft 21 configured so that all seedling vertical feed belts 8 can be rotationally driven by being rotatably attached to the back side of the seedling placement base 5, and one seedling vertical feed shaft 21 is provided. An operation arm 22 configured to rotate the seedling vertical feed shaft 21 by interlocking with a directional rotation clutch (not shown), and protrudes from the transmission case portion 3a of the rotation shaft 18 to the outside. A pair of left and right drive arms 23a, 2 attached so as to rotate integrally with the part
3b. When the seedling placing table 5 reaches the left lateral feed stroke end and the seedling planting claw 4c is taken out of the seedling, the operation arm 22 contacts the left driving arm 23a, and the seedling placing table 5 moves the right lateral feed stroke. After reaching the end and taking out the seedlings from the seedling planting claws 4c, the operation arm 22 is moved to the right drive arm 2
Contact 3b. Then, in either case, the drive arm 23a or 23b swings the operation arm 22 to cause the seedling vertical feed shaft 21 to pass through the one-way rotation clutch.
The seedling vertical feed shaft 21 drives all the seedling vertical feed belts 8 to rotate in the seedling vertical feed direction. When the moving stroke of the vertical seedling feeding belt 8 reaches a stroke equal to the vertical length of the seedling placing base of the block seedling taken out by the seedling planting claws 4c, the drive arm 23a or 23b releases the contact with the operating arm 22 and the operating arm. The swinging operation of 22 is released to stop the driving of the vertical seedling feeding belt 8. Then, the operation arm 22 automatically returns to the original vertical feed standby position for the return spring (not shown) acting on the operation arm 22. At this time, the turning power of the operation arm 22 is not transmitted to the seedling vertical feed shaft 21 by the transmission disengagement action of the one-way rotation clutch, so that all the seedling vertical feed belts 8 are returned to the vertical feed standby position of the operation arm 22. Despite the rocking, the seedlings remain stopped at the position where the vertical feeding was completed. As a result, when the seedling placing table 3 reaches the left and right lateral feed slot talk ends and the seedling planting claws 4c complete the taking out of the seedlings from the final lateral end of the mat-shaped seedling lower end, the vertical feed drive mechanism 20 each time. Takes out the seedling vertical feeding belt 8 and drives the seedling vertical feeding belt 8 so as to move in the vertical direction of the seedlings by a stroke, for example, in the vertical length of the seedling mounting table.

The gear transmission 30 is integrally attached to the end portion 14a of the lateral feeding shaft 14 of the seedling mounting table and four transmission gears 31 to 34, which are integrally rotatable with the planting drive shaft 15 by spline engagement. It is constituted by one shift gear 35 mounted so as to rotate. When a shift shaft 36 slidably provided in the transmission case portion 3a in parallel with the drive shaft 15 is slidably operated, the shift shaft 36 is integrally slidably attached to a portion of the shift shaft 36 located in the transmission case. There is shift gear 35
The shift fork 37, which is engaged in relative rotation with and integrally slidably engaged with, slides the shift gear 35 with respect to the drive shaft 15, and the four gear portions 35a to 35d provided in the shift gear 35 are connected to the shift gears. The rotation power of the planting drive shaft 15 is transmitted to the seedling table horizontal feed shaft 14 by meshing with the gears 31 to 34 separately. The four transmission gears 31 to 34 are made of gears having different outer diameters so as to exhibit four different transmission ratios. That is, the gear transmission 30 is configured so that the shift gear 3 is operated by sliding the shift shaft 36.
5 by changing over the transmission gears 31 to 34
The speed is switched to four speed stages from the fourth speed, and the lateral feed drive speed of the seedling mount 5 is switched to four stages by switching the drive speed of the seedling mount lateral feed shaft 14 to four stages. That is, when the gear transmission 30 is switched, the lateral feeding speed of the seedling placing table 5 with respect to the seedling planting claws 4c changes in four steps, and the seedling planting claws 4c cut the mat-like seedlings in the lateral direction to take out the seedlings. The number of times changes in four stages, and the lateral length of the block seedlings to be taken out changes in four kinds in the lateral direction.

To enable the switching operation of the gear transmission 30, the transmission case portion 3a of the shift shaft 36 is provided.
Acting on the shift shaft portion projecting outward from the shift shaft 3
6, a gear shift lever 40 and a gear shift operation force generating portion 45 for applying a gear shift operation force to the gear 6, and a positioning mechanism 50 and a stroke regulating mechanism 55, which act on the shift shaft 36 inside the transmission case portion 3a, as shown in FIG. The gear shift operation device including the stroke restricting mechanism 55 and the interlocking mechanism 60 that interlocks the positioning mechanism 50 with the lateral feed drive mechanism 10 is configured as follows.

As shown in FIG. 7, the gear shift lever 40 includes a base end side lever portion 40a configured to be swingably supported by a lever support portion 3c of the planting machine body 3 via a pivot shaft 41, The pivot shaft 4 is attached to the base side lever portion 40a.
1 and a grip portion side lever portion 40b which is swingably connected by a connecting pin 42 in a direction orthogonal to 1 and is arranged along the guide groove 43a of the lever guide 43 around the axis of the pivot shaft 41 to form the first portion. The rocking operation is performed in four operation positions, that is, a speed position A to a fourth speed position D. Then, when operated to each of the first to fourth speed positions A to D,
A lock spring 44 provided between the lever portions 40a and 40b is configured so that the grip portion side lever portion 40b is urged to swing about the axis of the connecting pin 42 with respect to the base end side lever portion 40a. The lever 40 is held at the predetermined operation position A, B, C, or D by causing the grip portion side lever portion 40b to enter into the notch portion 43b of the lever guide 43 and received and supported by the lever guide 43 by the operation force of In this way, the shift operation force generation unit 45 can generate and hold the shift operation force.

As shown in FIGS. 4 and 5, the shift operation force generating portion 45 is composed of shift springs 46a and 46b formed of a pair of coil springs fitted onto the shaft end portion of the shift shaft 36, and a spring case 47. Configured. Then, the spring case 47 is connected to the free end side of the base end side lever portion 40a by a connecting pin 48 parallel to the connecting pin 41 so as to be relatively rotatable, and is interlocked with the speed changing lever 40 to swing the speed changing lever 40. When the operation is performed dynamically, the gear transmission 30 is accordingly moved to the operation positions A to D of the shift lever 40.
Is generated and applied to the shift shaft 36 to generate a shift operation force for switching to a speed stage corresponding to. That is, when the speed change lever 40 is operated to the operation position on the higher speed side than the operation position before the speed change operation, when the positioning mechanism 50 acts to position the shift shaft 36 so as not to slide, the base end side lever portion 40a. Moves the spring case 47 with respect to the shift shaft 36 in the moving direction U shown in FIG.
Then, as shown in FIG. 4A, the spring case 47 presses one end side of the shift spring 46b in the moving direction U by the spring receiving portion 47b at one end side to fix the ring member 36a to the shift shaft 36. When the formed spring bearing portion 36a receives the other end of the shift spring 46b, the shift spring 46b is elastically deformed by compression to generate an elastic restoring force as a gear shifting operation force, and the elastic restoring force is generated.
The spring bearing portion 47b of No. 7 is applied to the shift shaft 36 as a reaction member via the spring bearing portion 36a. On the other hand, when the speed change lever 40 is operated to the operation position on the lower speed side than the operation position before the speed change operation, when the positioning mechanism 50 performs the positioning operation so as not to slide the shift shaft 36, the base end side lever portion 40a is moved. The spring case 47 is attached to the shift shaft 36 as shown in FIG.
It is moved in the moving direction D shown in. Then, the spring case 4
7 is the shift spring 46 by the spring receiving portion 47a on the other end side.
By pressing one end side of a in the moving direction D and the spring receiving portion 36a of the shift shaft 36 receiving the other end side of the shift spring 46a, the shift spring 46a is compressed and elastically deformed to be elastic as a shift operation force. A restoring force is generated, and this elastic restoring force is applied to the shift shaft 36 via the spring receiving portion 36a by using the spring receiving portion 47a of the spring case 47 as a reaction force member. When performing the gear shifting operation to either the high speed side or the low speed side, the gear shift lever 40 is switched from the first gear position to the third gear position or the fourth gear position, such as two or three stages from the operation position before the gear shifting operation. Even if the shift springs 46a and 46b are switched to different operation positions, the shift springs 46a and 46b elastically deform with a deformation stroke proportional to the operation stroke of the speed change lever 40, and the gear transmission 30 moves.
The elastic restoring force sufficient to move the shift shaft 36 by a moving stroke for switching over a plurality of steps corresponding to the operation stroke of is generated and applied to the shift shaft 36. As the shift shaft 36 slides, the spring bearing portion 36a of the shift shaft 36 moves in a direction away from the spring bearing portion 47a or 47b of the spring case 47, and the shift shaft 36 corresponds to the operation stroke of the shift lever 40. When the movement of the moving stroke is completed, the elastically deformed shift spring 46a or 46b returns to the original non-elastically deformed state. To this end, the gear transmission 30
After switching to the speed stage corresponding to the operation positions A to D of the gearshift lever 40, the gearshift operation force generation unit 45 releases the application of the gearshift operation force to the shift shaft 36.

As shown in FIGS. 3 to 6, the positioning mechanism 50 is formed on a shift shaft 36 and a stopper body 52 which is swingably mounted inside a transmission case portion 3a via a pivot shaft 51. The positioning unit 53 includes a plurality of cutouts 53a to 53d. That is, as shown in FIGS. 4A and 6B, the first stopper portion 52a located at the free end portion of the stopper body 52.
When any one of the cutouts 53a to 53d of the positioning portion 53 enters, the stopper body 52 receives and supports the shift shaft 36 so as not to slide even if a shift operation force is applied.
Then, when the shift shaft 36 is in the first speed position, the first notch portion 53a of the four notch portions 53a to 53d is formed, and when the shift shaft 36 is in the second speed position, the four notch portions 53a to 5d are formed.
The shift shaft 36 is 3 at the second cutout portion 53b of 3d.
The third cutout portion 53d of the four cutout portions 53a to 53d when in the high speed position and the fourth cutout portion of the four cutout portions 53a to 53d when the shift shaft 36 is in the fourth speed position. Positioning portions 53 are formed so that the first stopper portions 52a enter the respective 53d. As a result, the first stopper portion 52a of the stopper body 52 is made into the cutout portion 53.
When any one of a to 53d enters, the positioning mechanism 50
Becomes the operating state, and the shift shaft 36 is positioned at four operation positions of the first speed position to the fourth speed position against the speed change operation force applied by the speed change operation force generation unit 45. As shown in FIGS. 4B and 6A, when the first stopper portion 52a of the stopper body 52 comes out of the cutout portions 53a to 53d, the stopper body 52 cancels the receiving action on the shift shaft 36. As a result, the positioning mechanism 50 is brought into the operation-released state, and the shift shaft 36 causes the shift operation force generating portion 4
The gear shift operation force of 5 permits the switching operation to each of the first speed position to the fourth speed position.

As shown in FIGS. 3 to 6, the stroke regulating mechanism 55 includes the stopper body 52 and the shift shaft 3.
6 and the stopper shafts 56 attached to 6 and the shift shafts 36 arranged on both ends of the stopper shafts 56.
Positioning spring 57 consisting of a pair of coil springs fitted onto
a and 57b. And FIG.
As shown in (b) and FIG. 6 (a), the stopper body 5
The second stopper portion 52b located at the free end portion of the second stopper portion 56 is provided in the stopper receiving member 56 to form four notch portions 56a to 5a.
Stroke regulating mechanism 55 when entering any of 6c
Becomes a working state, and when the shift shaft 36 is switched and operated by the shift operation force generated by the shift operation force generator 45, the gear transmission 30 shifts the stroke by which the shift shaft 36 is moved by one step. It is configured to regulate the stroke.

That is, the stopper receiver 56 is attached to the shift shaft 36 so as to slide in the axial direction of the shift shaft 36 by a pair of attachment ring portions 56e, 56e formed so as to be slidably fitted on the shift shaft 36. There is. In a state where the second stopper portion 52b of the stopper body 52 comes out of the notches 56a to 56d of the stopper receiving member 56 and does not act as a stopper on the stopper receiving member 56, one of the pair of positioning springs 57a and 57b 57a serves as the shift fork 37. Is used as a reaction member to abut on one end side of the stopper receiver 56 to perform a positioning action, and the other positioning spring 5
The second stopper cylinder 5 in which 7b is fixed to the shift shaft 36
The stopper receiver 5 having the flange portion 8b as a reaction member
6 is brought into contact with the other end side of 6 to perform a positioning action, and the supporting force of the positioning springs 57a and 57b with respect to the stopper receiving member 56 is balanced. 4 (a)
It becomes the standard mounting position shown in. That is, the reference attachment position means the four notch portions 5 of the stopper receiver 56.
6a to 56d are 4 of the positioning portion 53 of the shift shaft 36.
The shift shaft 3 is separately provided for each of the notches 53a to 53d.
6 is a mounting position at the same position in the axial direction of 6. Therefore, when the stroke restricting mechanism 55 is activated when the shift shaft 36 is in the first speed position, the shift shaft 36 is in the second speed position in the first cutout 56a of the cutouts 56a to 56d. At the time of stroke regulation mechanism 55
When the stroke restricting mechanism 55 enters the second cutout portion 56b of the cutout portions 56a to 56d when the shift shaft 36 is in the third speed position, the cutout portions 56a to 56d. The third cutout portion 56c of the stroke restricting mechanism 5 when the shift shaft 36 is in the fourth speed position.
When 5 becomes the operating state, the second stopper portion 52b of the stopper body 52 is inserted into the fourth cutout portion 56c of the cutout portions 56a to 56d. And FIG. 4 (b)
The second stopper portion 52b of the stopper body 52 as shown in FIG.
When the shift operation force acts on the shift shaft 36 in a state where the shift shaft 36 enters any one of the notches 56a to 56d, and the shift shaft 36 moves in the movement direction D as shown in FIG. When the gear transmission 30 shifts by one step by sliding the movement stroke of the pitch, the first stopper cylinder 58a attached to the shift shaft 36 abuts on one end side of the stopper receiver 56, and the stopper body 5
2 is a stopper receiver 56 and a first stopper tube 58.
The shift shaft 36 is received and supported so as not to move further in the movement direction D via a. Then, as shown in FIG. 4B, when the shift shaft 36 moves in the moving direction U, when the shift shaft 36 slides a moving stroke of one pitch and the gear transmission 30 shifts by one step, the shift is performed. The second stopper cylinder 58b of the shaft 36 contacts the other end of the stopper receiver 56, and the stopper body 52 causes the stopper receiver 56 and the second stopper cylinder 5 to come into contact.
The shift shaft 36 is received and supported so as not to move further in the movement direction U via 8b. As a result, when the stroke restricting mechanism 55 is in the operating state, the shift shaft 36 is moved by one pitch even if the shift operating force of the two-step shift or the three-step shift is applied to the shift shaft 36 by the shift operating force generator 45. Make sure that only strokes are moved. The second stopper portion 52b of the stopper body 52 has the cutout portion 56.
When the stroke restricting mechanism 55 is released from the a to 56d, as shown in FIG. 4C, the stopper receiving member 56 after the stroke restricting works because of the pair of positioning springs 57a and 57b. The shift shaft 36 automatically returns to the reference mounting position.

As shown in FIGS. 3 and 6, the interlocking mechanism 60 includes the shaft end portion 14a of the seedling table horizontal feed shaft 14.
A first rotary cam 61 mounted so as to rotate integrally with the first rotary cam 62, a second rotary cam 62 mounted so as to be relatively rotatable on the planting drive shaft 15, and a first stopper portion 52a acting on the base end portion of the stopper body 52. 6, a first cam follower 52c of the pair of cam follower portions 52c and 52d abuts on the peripheral surface cam 61a of the first rotating cam 61,
The other second cam follower portion 52d is connected to the second rotary cam 62.
The contact spring 63 is configured to urge the stopper body 52 to swing so as to come into contact with the peripheral surface cam 62a. Gear portion 61g provided on the first rotating cam 61
And the gear portion 62g provided on the second rotary cam 62 are engaged with each other, and the number of teeth of the gear portion 61g of the second rotary cam 62 is made larger than that of the gear portion 61g of the first rotary cam 61. When the seedling table horizontal feed shaft 14 rotates and the seedling table 5 is reciprocally transferred, the first rotation cam 61 rotates at the same rotation speed as the seedling table horizontal feed shaft 14 and interlocks with this. The second rotary cam 62 is configured to rotate at a lower speed than the first rotary cam 61. First rotating cam 61
The peripheral cam 6a of the second rotary cam 62 is provided with a concave portion 61b into which the first cam follower 52c is inserted.
2a is provided with a recessed portion 62b into which the second cam follower 52d is inserted, and the first rotary cam 61 and the second rotary cam 61 which are determined by the tooth number difference between the gear portions 61g and 62g are provided.
Interlocking ratio of the rotating cam 62, arrangement of the recessed portion 61b in the first rotating cam 61, recessed portion 62 in the second rotating cam 62
By appropriately setting the arrangements of b, when the seedling placing table 5 is in the middle of the lateral feed which has not reached the left or right lateral feed stroke end, for example, FIG.
As shown in FIG. 5, in the stopper body 52, at least one of the two cam follower portions 52c and 52d has the first rotating cam 61.
Of the peripheral surface cam 61a other than the recessed portion 61b or the second
When the seedling placing table 5 reaches the lateral feed stroke end on either the left or right side in the first mounting posture in which the peripheral surface cam 62a of the rotary cam 62 rides on a portion other than the recessed portion 62b, as shown in FIG. As shown, the stopper body 52
The first cam follower portion 52c and the second cam follower portion 52d code the concave spring portion 61b of the first rotary cam 61 and the concave rotary portion 62b of the second rotary cam 62, respectively. It is configured to have a second mounting posture in which the recessed portion 61b or 62b is inserted by the force. Then, when the stopper body 52 is in the first mounting posture, as shown in FIG. 6B, the first stopper portion 52a of the stopper body 52 corresponds to the cutout portions 53a to 53d of the positioning portion 53 of the shift shaft 36. When the second stopper portion 52b comes out of the notches 56a to 56d of the stopper receiving member 56 while the stopper body 52 is in the second mounting posture, the second stopper portion 52b of FIG.
As shown in (a), the first stopper portion 52a of the stopper body 52 comes out of the cutout portions 53a to 53d of the positioning portion 53 of the shift shaft 36, while the second stopper portion 52b is cutout 56a of the stopper receiver 56. ~ 5
A stopper body 52 is formed so as to enter any of 6d. As a result, the interlocking mechanism 60 causes the positioning mechanism 50 and the stroke regulating mechanism 55 to move in the lateral feed drive mechanism 1.
When the seedling placing table 5 is in the middle of horizontal feeding until reaching the left and right lateral feeding stroke ends in conjunction with 0, the positioning mechanism 50 is in the operating state and the stroke restricting mechanism 55 is in the non-operating state. When the table reaches the left and right lateral stroke ends, the positioning mechanism 50 is automatically released and the stroke regulation mechanism 55 is automatically switched to the activated state each time.

In short, the shift lever 40 is rocked along the guide groove 43a of the lever guide 43 to be operated to any one of the first speed position A to the fourth speed position D and to be held at the operation positions A to D. Gear transmission 3
The gear shift target stage at which 0 should be switched is set. That is, when the gear transmission 30 is switched to the first speed, to the first speed position A, to switch to the second speed, to the second speed position B, to switch to the third speed, to the third speed position C, to switch to the fourth speed. To the 4th speed position D. Then
The shift operation force generation unit 45 generates a shift operation force and imparts it to the shift shaft 36 due to elastic deformation of the shift spring 46a or 46b associated with the operation of the shift lever. At this time, if the seedling placing table 5 is at the left or right side traverse stroke end, the positioning mechanism 50 is switched to the operation release state and the shift shaft 36 is allowed to switch, so that the shift shaft 36 shifts. It is switched by the shift operation force by the operation force generation unit 45. If the seedling placing table 5 is in the middle of horizontal feed until the end of the horizontal feed stroke, the positioning mechanism 5
Since 0 is in the operating state and the shift shaft 36 is positioned at the operating position before the shift lever is operated, the shift operating force generating unit 45 applies the shift operating force to the shift shaft 36. The shift shaft 36 does not switch and maintains the operation position before the operation of the shift lever, and thereafter, when the seedling placing table 5 is laterally fed and reaches the stroke end on the left or right side, the positioning mechanism 50 is released from the operation state. The shift shaft 36 is automatically switched by the gear shift operation force generated by the gear shift operation force generation unit 45 in order to allow the shift shaft 36 to be switched to the state. At this time, when the gear shift target speed stage set by the gear shift lever 40 is a gear shift target speed stage for changing only one stage from the speed stage before the gear shift lever is operated, the shift shaft 36 is switched to change the gear. The transmission 30 switches to a set gear shift target speed stage, that is, a speed stage corresponding to the operation positions A to D at which the gear shift lever 40 is located, and the application of the gear shift operation force by the gear shift operation force generation unit 45 is released to shift the shift shaft 36. The switching control is completed. However, when the gear shift target speed stage set by the gear shift lever 40 is a gear shift target speed stage for changing the speed stage before the gear shift lever is operated by two or more stages, the first shift shaft 36 after the gear shift lever is operated. The switching movement ends in the switching movement of only one-step shifting due to the throttle talk regulation by the stroke restricting mechanism 55, and the gear transmission 30 only switches from the speed step before the shift lever operation to the speed step changed by one step. It does not switch to the speed stage of the gear shift target speed stage yet. After that, when the seedling placing table 5 is further fed laterally to reach the right or left stroke end, the positioning mechanism 50 switches from the operating state to the operating release state each time, and the shift shaft 36 is allowed to switch. Since the stroke restricting mechanism 55 restricts the movement stroke of the shift shaft 36, the shift shaft 36 is automatically switched by the shift operation force generated by the shift operation force generation unit 45 by only the movement stroke for one-step shift. That is, after the gear shift lever 40 is operated to set the gear shift target speed stage,
The seedling placing table 5 reaches the end of the lateral feed stroke by repeating the number of times equal to the number of speed step differences from the set gear change target speed step, and the shift shaft 36 is switched by one pitch by the gear change operation force generated by the gear change operation force generator 45. After being operated, the gear transmission 30 is switched to the gear shift target speed stage, that is, the speed stage corresponding to the operation positions A to D where the shift lever 40 is located.

[Other Embodiments] In order to configure an interlocking mechanism that interlocks the positioning mechanism and the stroke regulating mechanism with the lateral feed drive mechanism, it is necessary to set the interlocking mechanism between one stroke end and the other stroke end of the seedling placing table. A single rotating cam that is linked to the seed feeding table horizontal feed shaft to reduce rotation is provided, and a cam means for controlling the stopper body is adopted by this rotating cam, and the rotation speed of the seedling table horizontal feed shaft is detected. It is also possible to employ an electric control means for automatically controlling the sensor for controlling the electric actuator for controlling the stopper body based on the detection result from the sensor. In the case of the above-mentioned implementation structure, the 1st which rotates integrally with the seedling table horizontal feed shaft
Since the stopper body is controlled by both the rotating cam and the second rotating cam that is interlocked with the first rotating cam, the second rotating cam is made smaller than the cam means and is interlocked. Obtained compactly from the mechanical aspect. In addition, there is an advantage that the structure is simpler than that of the electric control means.

The present invention can be applied to a case where the gear transmission 30 is replaced by a transmission that can be switched in only three stages or a transmission that can be switched in five or more stages. Furthermore, the continuously variable transmission may be implemented by adopting a transmission configured to use only a predetermined speed stage stepwise. Therefore, these are collectively referred to as the speed change unit 30, and the shift shaft 36 is referred to as the operation unit 36.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of drawings]

[Figure 1] Side view of the entire riding type rice transplanter

[Figure 2] Cross-sectional view of the seedling platform horizontal feed mechanism

FIG. 3 is a sectional view of the gear transmission.

FIG. 4 is an explanatory diagram of a positioning mechanism and a stroke regulation mechanism.

FIG. 5 is an explanatory view of a positioning mechanism and a stroke regulation mechanism.

FIG. 6 is a sectional view of the interlocking mechanism.

FIG. 7 is a perspective view of a shift lever

FIG. 8 is a plan view of a seedling planting mechanism.

[Explanation of symbols]

 4c Seedling planting claws 5 Seedling placement table 10 Lateral feed drive mechanism 30 Gear transmission 36 Operation part 40 Shift lever 45 Shift operation force generation part 46a, 46b Shift spring 50 Positioning mechanism 55 Stroke control mechanism

Claims (2)

[Claims] 1. A seedling placing table (5) on which a mat-like seedling to be supplied to the seedling placing nails (4c) is placed, and the seedling placing table (5) in association with a seedling planting movement of the seedling placing nails (4c). )
A seedling lateral feeding device of a seedling planting device comprising a lateral feeding drive mechanism (10) for reciprocally moving the seedlings in a lateral direction of the machine body, wherein the lateral shifting drive speed of the seedling placing table (5) is switched to three or more stages. (30) is the lateral feed drive mechanism (10)
In addition, a gear shift lever (40) for setting a gear shift target speed stage for switching the gear shift unit (30) is provided, and the set gear shift target is set as the gear shift target speed stage is set by the gear shift lever (40). A speed change operation force for switching the speed change unit (30) to a speed stage is generated and applied to the operation unit (36) of the speed change unit (30), and the speed change unit (30) causes the set speed change target speed to be set. A shift operation force generation unit (45) for canceling the application of the shift operation force to the operation unit (36) when the operation unit (36) is switched, and a positioning mechanism (50) for the operation unit (36),
The operating state in which the operating section (36) is positioned at each of the shift operating positions against the shift operating force generated by the shift operating force generating section (45), and the operating section (36) controls the shift operating force generating section. The positioning mechanism (50) and the lateral feed drive mechanism (1) are provided so as to be switchable to an operation release state in which the shift operation force by (45) allows the switching operation.
0) in conjunction with each other, until the seedling placing table (5) reaches the lateral feed stroke end, the positioning mechanism (50).
Is in the operating state, and when the seedling placing table (5) reaches the lateral feed stroke end, the positioning mechanism (5
0) is automatically switched to the operation release state, and when the operation part (36) is switched by the shift operation force generated by the shift operation force generation part (45), the operation part (36). ) The seedling lateral feeding device of the seedling planting device, which is provided with a stroke restriction mechanism (55) for restricting the stroke of moving operation to a stroke in which the speed change part (30) shifts by one step. 2. The shift unit (30) is a gear transmission, the operation unit (36) is a slidable shift shaft of the gear transmission, and the shift operation force generation unit (45) is the shift lever. The shift springs (46a), (46) that are deformed by (40) and that slide-operate the shift shaft by the elastic restoring force associated with this deformation.
The seedling lateral feeding device of the seedling planting device according to claim 1, further comprising b).