JPH0637628Y2 - Multi-stage switching device for lateral feeding speed of seedling table in seedling planting equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to the structure of a device for changing the lateral feeding speed of a seedling table in a seedling planting device in multiple stages.

[Conventional technology and its problems]

2. Description of the Related Art Conventionally, it has been practiced to laterally feed a seedling placing table in a seedling planting device at an appropriate speed and divide the seedling mat of the seedling placing table by a planting mechanism to plant in a field.

In that case, the lateral feeding speed of the seedling table is changed in order to increase / decrease the lateral division amount of the seedling mat per one time by the planting mechanism and thus the number of seedlings per plant to be planted in the field scene. However, the seedling mat is usually forcibly longitudinally fed in the lower end direction of the seedling placing table at the lateral movement end of the seedling placing table, so that in order to match the timing, the shift of the lateral feeding speed of the seedling placing table, It shall be configured so that it is possible only when the seedling table is at the end of the lateral feed. A so-called automatic switching device for that purpose is, for example, Japanese Utility Model Publication No. 53-46180 as a prior art.

However, this mechanism is applied to a large and small two-speed transmission mechanism, and a shift restraining device is arranged across the driven side and the drive side, and this shift mechanism is used as it is for three or more speeds. Not applicable to mechanisms.

Therefore, conventionally, there has been a problem that it is extremely difficult to match the timing with the vertical feeding mechanism of the seedling mat without manually performing the mechanism for shifting the horizontal feeding speed to three or more steps.

Further, in the above-mentioned prior art, a feed shaft for laterally moving the seedling table and a reciprocating screw groove for reciprocating the left and right sides are arranged in the transmission case, and both left and right ends of the feed shaft are provided on both left and right sides of the transmission case. Since it is slidably pierced, the left and right dimensions of the transmission case become longer, leading to an increase in the size of the transmission case, which in turn impedes the weight reduction and compactness of the rice transplanter.

SUMMARY OF THE INVENTION The present invention aims to solve the conventional problems and to provide a mechanism capable of automatically shifting gears even in a gear mechanism having three or more gears, and also to reduce the weight and size of the rice transplanter. It is what

[Means for solving problems]

For this reason, in the present invention, a planting mechanism that divides a seedling mat on a seedling table that is reciprocally moved laterally through a traverse shaft having a reciprocating screw groove to plant in a field scene, and a lateral feed of the seedling table. In a seedling planting device comprising a speed change mechanism for changing the speed in multiple stages,
One end of the lateral feed shaft is exposed to the inside of the transmission case, and the transmission mechanism and the shift shifter are arranged in the transmission case in association with the one end of the transverse feed shaft. A switching lever for holding the seedling mounting table at the position for switching the lateral feed speed and a pair of biasing springs mounted facing each other on both sides of the switching lever are arranged, and the pair of biasing spring forces are used. The shift shifter is urged by the switching lever so as to move in a preset shift stage direction, while the shift shifter is disengageably engaged with a restricting device that restricts movement in the shift direction. The restricting tool is supported by the transmission case so as to be slidable in parallel with the axis of the transverse feeding shaft, and the tip of the restricting tool is configured to be biased to project out of the transmitting case. A regulatory solution that moves integrally with the seedling mounting table at the lateral feed end At the body, which is constituted so as to forcibly move in the direction of regulation release the restricting mechanism.

[Function of device]

According to the present invention, due to the above-mentioned configuration, the pair of biasing springs are in balance when the gear position of the shift lever and the gear position of the shift shifter are in agreement. That is, the shift shifter coincides with the shift stage at the present time in the shift mechanism, and the seedling table is laterally fed at the speed corresponding to the shift stage.

After that, when it is desired to change the lateral feed speed of the seedling mounting table, only the switching lever is placed in a state of being held in advance at the predetermined gear shift position. Then, the shift shifter is biased by the pair of biasing springs so as to come to the position of the shift stage of the switching lever, but the shift shifter is in a state where the position is regulated by the restraint. , The seedling placing table is laterally fed at the speed state in the gear position before the gear shifting.

And, when the seedling table to be fed laterally comes to the moving end,
The restriction releasing body that moves integrally with the seedling table is forcibly moved to release the restriction between the shift shifter and the restrictor, so that the shift shifter is switched by the biasing force of the biasing spring. The lever moves in the direction of the preset gear position, and the switch lever and the shift shifter are switched to the matched position.

After that, the speed change mechanism operates at the set speed stage,
The seedling table is laterally fed at the speed after the predetermined change.

[Effect of device]

In this way, according to the present invention, the switching of the lateral feeding speed of the seedling mounting table can be automatically executed by moving the seedling mounting table to the lateral feeding moving end, and the transmission mechanism has a multi-stage shifting of three or more steps. Even if it can be executed, it has a remarkable effect that it can be easily executed.

Further, the reciprocating screw groove portion of the transverse feed shaft, the pair of biasing springs for biasing the switching lever, and the deregulator are located outside the transmission case in which the speed change mechanism and the speed shifter are incorporated, and Since the tip side is also projected out of the transmission case, the transmission case can be made compact, and thus the rice transplanter can be made lighter and more compact.

〔Example〕

An embodiment in which the present invention is applied to a riding type rice transplanter will be described below. The traveling machine body 1 shown in FIG.
And front wheels 3,3 mounted on the lower surface of the front part thereof and rear wheels 5,5 mounted on the lower surface of the rear part via axle cases 4,4, and a control seat 6 and a control handle 7 are provided on the upper surface of the body frame 2. And a power transmission case 10 with a continuously variable transmission mechanism 11 is provided on the vehicle body frame 2 in front of the axle 9 of the rear wheel 5, and the power transmission is performed by the driving force of the engine 8 on the upper front surface of the vehicle body frame 2. Power transmission mechanism and axle case in the case 10
The rear wheels 5 are driven via 4, 4 and the front wheels 3 are driven via the propulsion shaft 12.

Reference numeral 13 designates a seedling planting device which is attached to the rear part of the traveling machine body 1 through a parallel link mechanism 14 so as to be movable up and down, and is located above the power transmission case 10 and in front of the axle 9 of the rear wheel 5. The hydraulic cylinder 15 arranged in the above-mentioned section largely drives the seedling planting device 13 up and down through the parallel link mechanism 14.

The seedling planting device 13 includes a transmission case 16 and the transmission case 16
Located on the lower surface of the central planted transmission case 17, and the planted transmission cases 19 and 19 that are mounted at appropriate intervals via the central planted transmission case 17 mounted on one side and the connecting pipe 18 in which the transmission shaft is inserted. Central float 20 and floats 21, 21 arranged on the lower surface of each planted transmission case 19 and a seedling table 22 inclined so that the upper end approaches the traveling body, and the central planted transmission case
On the left and right sides of the rear part of each of the 17 and each of the planted transmission cases 19, two pairs of planted rods are rotated up and down while keeping substantially the same posture, and a seedling take-out port and a field scene on the seedling take-out plate on the lower end side of the seedling stand. A so-called rotary type planting mechanism 23 that reciprocates between the two is provided.

The parallel link mechanism 14 is composed of one top link 24 and a pair of left and right lower links 25, 25, and the pair of lower links 25, 25 is a space truss composed of a vertical arm and a stay arranged on the upper side thereof. It is reinforced by a frame structure member such as, and is attached to the transmission case 16 via the hitch body 26 in the seedling planting device 13.

A trochanter 28 is provided on the upper end of a pillar 27 standing from the front ends of the left and right planted transmission cases 19, 19, while an upper rail 29 in the middle of the back surface of the seedling stand 22 is covered by the trochanter 28. The lower rail 30 that fits and attaches to the lower end of the seedling placing table 22 is placed on a slider (not shown) protruding from each planted transmission case so that it can be reciprocally moved left and right by a lateral feeding shaft means described later. Constitute.

Further, between the upper surfaces of the planted transmission cases 17 and 19, a seedling pick-up plate 31 having a right and left length is arranged in parallel with the lower rail 30, and a support plate 32 attached to the seedling pick-up plate 31 is provided in each planted transmission case. A seedling stand that is mounted on the side surfaces of 17, 19 so that it can slide up and down, and that the support plate 32 can be moved up and down via the operating rod 33 with a crank to move only laterally.
By adjusting the distance from the lower end of the seedling 22, the vertical length of the seedling mat on the seedling mounting table 22 is adjusted.

From the PTO shaft projecting from the rear end of the power transmission case 10 through the expandable shaft 35, the input shaft 36 of the transmission case 16 to the bevel gears 37, 38, and the center of the chain 39 via the chain sprocket 40 and chain. Power is transmitted to the transmission mechanism 41 in the planted transmission case 17 and to the transmission mechanisms 41 and 41 in the planted transmission cases 19 and 19 on both left and right sides via the transmission shafts 42 in the connecting pipes 18, respectively. A rotary type planting mechanism 23 mounted on both left and right sides of the transmission cases 17 and 19 is rotationally driven.

A transmission case that is arranged in parallel with the connecting pipe 18
The lateral feed shaft 43 arranged outside 16 is pivotally supported at one end in the transmission case 16 so as to be rotated by a speed change mechanism 44 formed of a key shift type gear train in the transmission case 16, and The end is pivotally supported by a plate-like support arm 45 protruding from the other end of the connecting pipe 18 or the base of the planted transmission case 19, and a boat-shaped key 47 that engages with a reciprocating screw groove 46 formed in the lateral feed shaft 43 is attached. To the slider 48 provided, a triangular bracket 50 fixed to the lower rail 30 at the lower end of the back surface of the seedling mounting table 22 is detachably connected via screws 51 or the like to rotate the rotary type planting mechanism 23. The seedling table 22 is horizontally fed back and forth in a synchronized manner.

Then, the outer circumference of the lateral feed shaft 43 that is projected from the side surface of the transmission case 16 and is exposed to the outside is defined by the left and right side portions of the slider 48 and the transmission case.
It is configured to be covered with a stretchable bellows-type cover 52 made of rubber or the like, which is provided between the side surface of 16 and the side surface of the plate-like support arm 45. A recess is formed on the inner surface of the slider 48 so that the air in the cover bodies 52, 52 on the left and right sides can move through the space with the reciprocating screw groove 46 when the slider 48 moves laterally. is there.

In addition, the seedlings separated from the seedling pick-up plate 31 at the lower end of the seedling mounting table 22 by the planting rod of the rotary type planting mechanism 23 moving along the locus shown by the chain double-dashed line in FIG. Plant.

Further, feed cams 54, 54 are provided at both left and right ends of a shaft 53 rotatably mounted on the transmission case 16 so that the shaft 5 can be moved in the transmission case 16.
The cam 56 attached to 3 is configured to reciprocally rotate by a certain angle by the rotation of the cam 57 at the end of the transverse feed shaft 43.
A vertical feed shaft 58 is rotatably supported on the lower part of the rear surface of 22, and the vertical feed shaft 58 is provided with a driven cam 59 with a one-way rotating clutch that intermittently rotates this one pitch in one direction at a time. The vertical feed shaft 58 is intermittently rotated by the one feed cam 54 abuttingly pressing the driven cam 59 at both left and right ends of the horizontal feed.

The vertical feed shaft 58 and the rotary shaft 60 arranged in parallel therewith are fitted with a vertical feed body 61, and the belts wound around the both shafts 58, 60 are rotated in synchronism with each other, whereby Vertical feed 61
The seedling mat on the seedling table 22 is vertically fed in the direction of the seedling take-out plate 31 at the lower end.

Then, as shown in FIG. 5, the speed change mechanism 44 including a gear train for changing the lateral feed speed of the seedling mounting table 22 includes three drive side gear trains 62 that engage with the drive side shaft 39, and Three driven gear trains 63 that constantly mesh with this, and a key groove 64 along the axis of a lateral feed shaft 43, which is a driven shaft on which the gears of the driven gear train 63 are rotatably fitted, are slidable. The key body 65 to be fitted, and the key body 65
Composed of a shift shifter 66 for moving the key body 65, and the key body 65 is biased radially outward by a leaf spring body 67 attached to the lower surface thereof, and the key body 65 is moved back and forth via a shifter ring 68 in the shift shifter 66. By selectively fitting the engagement portion of the key body 65 to the inner diameter engagement groove of an arbitrary gear in the driven gear train 63, the rotational speed of the transverse feed shaft 43 is increased or decreased and engaged with the reciprocating screw groove 46 thereof. Increase or decrease the lateral movement speed of the slider 48 with the boat key.

An automatic switching device 70 for switching the shift speed of the speed change mechanism 44.
As shown in FIGS. 5 to 8, the switching lever is loosely fitted to the operation shaft 71 of the shift shifter 66 outside the transmission case 16.
72, a pair of biasing springs 73, 73 mounted between the switching lever 72 and the operating shaft 71, and a restricting tool 74 for restricting the rotation of the operating shaft 71.

An operation shaft 71 of the shift shifter 66 is rotatably supported on the transmission case 16, an arm plate 75 is fixed to a lower end of the operation shaft 71, and one end surface of the arm plate 75 has an engaging pin of a restrictor 74. Engagement recesses 76 capable of engaging with 84 are formed at appropriate intervals along the rotation direction of the operation shaft 71, and a connecting rod 77 for engaging with the shifter ring 68 is projected at the other end of the arm plate 75. To do.

A boss portion 72a of a switching lever 72 is loosely fitted on the operation shaft 71 of the shift shifter 66 outside the transmission case 16 so that the operation shaft 7
While holding the boss portion 72a of the switching lever 72 with a holding cover body 79 having a substantially semicircular shape in plan view, which is fixed to the end face of 1 with a bolt 78,
Between the left and right ends of the boss 72a loosely fitted to the operation shaft 71 and the holding cover body 79, one of the left and right biasing springs 73, 73 is mounted so that the biasing force can be adjusted, and is attached to the transmission case 16. The gear shift position holding plate 80 is configured such that the longitudinal middle portion of the switching lever 72 is selectively fitted into a plurality of position holding engaging grooves 81, 81, 81 formed by notches in the long groove. The spring 82 is for biasing and holding the tiltable switching lever 72 in the position holding engagement groove 81.

The shaft-shaped restricting tool 74 is slidably supported in parallel with the transverse feed shaft 43, and the engaging pin 84 at the proximal end of the restricting tool 74 is fitted into the engaging recess 76 of the arm plate 75 by the force of the spring 83. Is configured to regulate the rotation of the operation shaft 71. The force of the spring 83 on the side of the restricting tool 74 is set so as to exceed the force of the pair of biasing springs 73, 73.

A bolt-shaped contact member with adjustable length at the tip of the restrictor 74
85 is mounted, and the contact member 85 is provided so as to be in surface contact with the regulation release body 86 fixed to the triangular bracket 50 fixed to the seedling mounting table 22, and the lateral movement of the seedling mounting table 22 is performed. When approaching in the lateral direction of the transmission case 16 among the ends, the restriction releasing body 86 presses the restricting tool 74 against the force of the spring 83, thereby forcibly retracting the restricting tool 74, and the engaging pin 84. The engagement between the arm plate 75 and the engagement recess 76 is released (see the chain double-dashed line in FIG. 5).

The planted transmission cases 19, 19 and the central float 20 arranged on the lower surface of the central planted transmission case 17 are provided with means (not shown) for detecting the height with respect to the field scene, and the central float.
20 and the float 2 arranged on the lower surface of each transmission case 19 with plants
1,21 has a structure in which the planting depth of the seedling can be adjusted by the planting depth adjusting rod 87.

Reference numeral 90 denotes a spraying device for fertilizers, chemicals, etc., which is mounted on the seedling planting device 13, and is mounted on columns 91 standing upright from the central planting transmission case 17 and the planting transmission cases 19, 19 on both left and right sides.

On the other hand, a chain sprocket 97 with a power take-off shaft 96 is provided in the middle of the longitudinal direction in each of the planted transmission cases 17 and 19, and the chain sprocket of the transmission mechanism 41 at the base of each planted transmission case is provided.
92 and a planting arm shaft 93 that rotationally drives the planting mechanism 23 at the tip.
The chain sprocket 97 is meshed with the power transmission chain 95 wound around the chain sprocket 94 and the power transmission is ensured by a pair of upper and lower chain thai toners 98, 98 made of leaf springs. Further, since the chain sprocket 97 with the power take-off shaft 96 is provided in the longitudinal middle portion of the planted transmission case, it is not necessary to increase the length of the planted transmission case, and the weight can be reduced.

Reference numeral 99 is a connecting rod with a crank arm connected to the power takeoff shaft 96, and reference numeral 100 is an upper end of the connecting rod 99 and a medicine spraying device 90.
Is a swingable and rotatable intermediate connecting rod having the other end of a link 104 connected to the feeding mechanism 101 at one end, and the intermediate connecting rod 100 is provided with a longitudinal adjusting screw 103 for its rotating central shaft 102. By adjusting the length, the rotation angle (θ) of the intermediate connecting rod 100 can be increased or decreased to increase or decrease the amount of the medicine dispensed by the dispensing mechanism 101.

In this configuration, in the rice planting work, while placing the seedling mat on the surface of the seedling mounting table 22, while the seedling planting device 13 is moved downward by driving the hydraulic cylinder 15, the floats 21, 20, 21 are grounded in the field. If the wheels 3 and 5 are driven, the aircraft goes straight, and by driving the planting mechanism 23, the seedlings are divided from the seedling mat on the seedling mounting table 22 that is fed laterally as described later, while dividing the seedlings into single fields. In addition, seedlings can be planted along a plurality of lines (6 lines in this embodiment).

Then, in order to change the number of lateral divisions of the seedling mat, and thus the number of seedlings per plant, the switching lever 72 is previously engaged with the predetermined position holding engaging groove 81 of the position holding plate 80. Then, the holding cover body 79 and the operation shaft 71 are biased via the pair of biasing springs 73, 73 so as to rotate in the direction in which the spring force is balanced with respect to the switching lever 72.

On the other hand, the engaging pin 84 of the restricting tool 74 is engaged with the engaging recess 76 of the arm plate 75 on the operating shaft 71, and the force of the spring 83 on the restricting tool 74 side is the pair of biasing springs 73, 73. Since it exceeds the force, this prevents the operation shaft 71 from rotating, and the shift shifter 66
There is also no movement of the Renryoku 77.

Therefore, the key body 65 is engaged with the connecting rod 77 of the arm plate 75 and the sliding movement of the shifter ring 68 with respect to the lateral feed shaft 43 does not occur, so that the key body 65 moves laterally according to the gear ratio due to the engagement of the driven gear and the drive gear in that state. By rotating the feed shaft 43, the lateral movement of the slider 48 with the boat-shaped key engaged with the reciprocating screw groove 46 of the transverse feed shaft 43, and by extension, the seedling table 22
The horizontal feed speed of the seedlings is also the specified speed before it is changed.
The lateral width of the seedling mat that crosses the seedling taking-out port of the lower end seedling taking-out plate 31 of 22 becomes a predetermined value.

Then, the seedling mounting table 22 is a transmission case of the lateral feed moving end.
When it comes to the side approaching the side surface of 16, the regulation releasing body 86 attached to the bracket 50 of the seedling placing table 22 pushes the regulating tool 74 back against the force of the spring 83, and its engaging pin 84 and arm plate.
The engagement with the engagement recess 76 in 75 is released, and the operation shaft 71 is rotated via the holding cover body 79 so that the pair of biasing springs 73, 73 are balanced left and right, and by the switching lever 72. It rotates in the direction of the preset speed.

As a result, the connecting rod of the arm plate 75 in the shift shifter 66 is linked.
77, the shifter ring 68, and the key body 65 are moved, and the driven gear of the shift stage to be changed is rotated integrally with the lateral feed shaft 43 via the key body 65. The transverse feed speed has been changed.

Therefore, the width dimension of the seedling mat that crosses the seedling take-out opening in the lower end seedling taking-out plate 31 of the seedling placing table 22 becomes a predetermined value, and the change in the number of seedlings per plant divided by the planting rod 23a in each planting mechanism 23 can be changed. You can do it.

In this way, at the end of the lateral movement of the seedling mounting table 22, the speed automatically shifts to the preselected gear, so the lateral movement end of the seedling mounting base 22 vertically feeds the seedling mat by a predetermined amount. The timing with the mechanism that operates can also be automatically taken.

Moreover, even if the lateral feed speed transmission mechanism 44 of the seedling mounting table has multiple stages of three stages or more, it can be easily executed.

Although the driven shaft of the speed change mechanism 44 is also used as the lateral feed shaft 43 in the above-described embodiment, the speed change mechanism 44 may be installed at another position in the transmission case 16, and the deregulator 86 may also be used. It can be provided at the slide 48 itself which moves laterally or at any place on the seedling stand 22.

The present invention can also be applied to the case where the planting mechanism 23 is not a rotary type but a vertically swinging type planting mechanism, and the seedling planting device 13 is attached to the front side of the traveling machine body 1 or walking. It goes without saying that it can also be applied to model rice transplanters.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a side view of a rice transplanter, Fig. 2 is a plan view, Fig. 3 is an enlarged sectional view taken along line III-III of Fig. 2, and Fig. 4 is a third view. Fig. 5 is a sectional view taken along the line IV-IV, Fig. 5 is a sectional view taken along the line VV of Fig. 3, Fig. 6 is a sectional view taken along line VI-VI of Fig. 5, and Fig. 7 is VII-VII of Fig. 5. Sectional view, FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 6, FIG. 9 is a side view with a part cut away in FIG. 1, and FIG. 10 is a sectional view taken along line XX in FIG. . 1 ... traveling body, 2 ... body frame, 3,5 ... wheels,
8 ... Engine, 13 ... Seedling planting device, 14 ... Parallel link mechanism, 15 ... Hydraulic cylinder, 16 ... Transmission case, 17 ... Central planting transmission case, 19 ... Planting transmission case, 18 ... … Connecting pipe, 41 …… Transmission mechanism, 22 …… Seedling table, 23 …… Planting mechanism, 31 …… Sprouting plate, 36 …… Input shaft, 43 …… Transverse shaft,
46 …… Reciprocating screw groove, 47 …… Ship key, 50 …… Bracket, 48 …… Slider, 52 …… Cover, 44 …… Transmission mechanism, 58
...... Vertical feed shaft, 62 ...... Drive side gear train, 63 ...... Drive side gear train, 65 ...... Key body, 66 ...... Shift gear shifter, 67 ...... Leaf spring body, 68 ...... Shifter ring, 70 ...... Switching device, 71 …… Operation axis, 72 …… Switching lever, 72a …… Boss part, 73,73 ……
Biasing spring, 74 ... regulator, 75 ... arm plate, 76 ... engaging recess, 77 ... connecting rod, 79 ... holding cover body, 83 ... spring,
80: Position holding plate, 81: Position holding engaging groove, 85: Contact member, 86: Restriction release body.

Claims (1)

[Scope of utility model registration request] 1. A planting mechanism for dividing and planting a seedling mat on a seedling table which is reciprocally laterally moved through a transverse shaft having a reciprocating screw groove, and a lateral feeding speed of the seedling table. In a seedling planting device comprising a gear shifting mechanism for shifting the gears in multiple stages, one end of the lateral feed shaft is exposed in a transmission case, and the gear shift mechanism and the gear shifter are provided in the transmission case. A switching lever that is disposed in association with one end of the transmission case and that is held outside the transmission case at the switching position of the gear position of the lateral feed of the seedling mounting table; and a pair of mounting levers facing each other on both sides of the switching lever. An urging spring is disposed, and the pair of urging spring forces urges the shift shifter to move in a preset shift direction by the switching lever, while the shift shifter moves in the shift direction. The restriction device that restricts the movement of the It is configured to be supported by a transmission case so as to be slidable in parallel with the axis line of the lateral feeding shaft, and configured to urge the tip of the restricting tool to project out of the transmission case, and laterally move the seedling placing table. At the end, the regulation releasing body that moves integrally with the seedling placing table is configured to forcibly move the regulating tool in the direction of deregulating the seedling placing table. Multi-stage switching device.