JP2519371B2 - Rice transplanter seedling feeding device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to abutting between a lateral side of a nail and a laterally moving seedling when the seedling is taken out from a seedling stand by a nail with a seedling. The present invention relates to a seedling feeding device for a rice transplanter, which is provided with a drive device that reduces the reciprocating speed of the seedling placing table at the time of removing the seedling from the seedling placing table by the seedling planting claw to prevent deformation of the mat-like seedling. [0002] As described above, in the seedling feeding device of the rice transplanter equipped with the drive device for reducing the reciprocating speed of the seedling stand at the time of taking out the seedling, the seedling stand is reciprocated except for its end. Compared to the structure that constantly moves at a constant speed over the entire moving range, the cutting surface of the mat-shaped seedling during lateral movement by the seedling-planting nails is the direction in which the nail drive locus and the seedling movement locus are combined, that is, the mat-like shape. Since it is possible to prevent the mat-shaped seedlings from being cut extremely obliquely in the thickness direction of the seedlings, it is useful in that the seedlings can be taken out while preventing the deformation of the seedlings. As a conventional seedling feeder for this seeder planting machine, [1] a hydraulic cylinder for driving the seedling stand was provided, and the pressure oil was supplied to this hydraulic cylinder at the timing of seedling separation from the seedling stand by the claws with seedlings. The pump device is configured to intermittently supply pressure oil to the hydraulic cylinders in response to the operation of the eccentric cam that works in conjunction with the drive mechanism of the seedling planting claw so that the oil supply is automatically stopped. A drive unit for a seedling stand (for example, Japanese Patent Publication No. 51-9646). [2] A screw shaft provided with an endless spiral groove on the peripheral surface and a top engaging with the groove are moved relative to each other by their relative reciprocating movements by relative rotation, and the seedling stand is moved back and forth laterally, and at the same time, Relative drive rotation is configured to automatically stop at the time of seedling splitting by the seedling planting claw by the ratchet mechanism and cam mechanism etc. interposed in those drive systems, and the seedling stand laterally moves at the seedling picking timing. Configured to be performed intermittently (for example, Japanese Patent Publication No. Sho 49-37652). Above [1],
Those described in [2] are known. [0003] However, the former
In the case of the pressure oil supply control of [1], due to operation delay due to the characteristics of the hydraulic drive device, leakage from each device part, etc., the intermittent lateral feed pitch of the seedling stand may be irregular. There is a risk of sticking, which may cause a large change in the amount of seedlings picked up by the nails. In the latter [2] mechanical intermittent relative drive rotation between the screw shaft and the top, the cams and ratchet mechanisms of those drive systems cause backlash and rattling, resulting in intermittent seedling stand. Irregularities occur in the transverse feed pitch, which causes a problem that the seedling picking performance is deteriorated, for example, the amount of seedling picked by the nail changes. Moreover, in any of these structures, the lateral movement of the seedling placing table is performed by alternately repeating driving and stopping, so that abrasion of the mechanical structure portion due to intermittent driving is likely to occur and durability is improved. It is also disadvantageous. Moreover, in recent years, with the speeding up of the planting mechanism, the seedlings on the seedling stand are displaced by being repeatedly driven and stopped at high speed, and compressed at one end of the seedling stand. As a result, a gap may be formed at the opposite end, which may cause inconvenience such as variation in the amount of seedlings to be taken. An object of the present invention is to adopt a screw shaft having a simple structure when laterally feeding the seedling stand, but laterally feeding the seedling stand by the screw shaft causes a complicated and large-sized feeding mechanism. Without slowing down, you can smoothly and appropriately perform intermittent deceleration in a state where the timing of seedling picking with the seedling planting is accurately adjusted.
The aim is to maintain good seedling picking performance, to reduce the weight of the seedling feeder, and to improve its durability. [0004] The technical means of the present invention taken to achieve the above object is to laterally feed the seedling stand when the seedling is taken out from the seedling stand by the nail for planting seedlings. In a seedling feeding device of a rice transplanter equipped with a driving device configured to reduce the reciprocating speed in a direction, the driving device is used to move a seedling placing table laterally for laterally feeding the seedling placing table and the seedling placing device. It is composed of a gear transmission mechanism that transmits the rotational driving force on the driving side to the table for lateral movement of the stand, and the shaft for lateral movement of the seedling stand,
A screw shaft that transmits a lateral feed force to the seedling stand and a piece that engages with an endless spiral groove formed on the peripheral surface of the screw shaft and that relatively reciprocates and relatively rotates with respect to the screw shaft. In addition to the above, the gear transmission mechanism, the constant rotation gear provided on the seedling stand lateral movement shaft, and the constant rotation gear provided on the drive side output shaft to mesh with the constant rotation gear to transmit power. A non-constant speed gear that is configured in combination with a rotary gear and that transmits both of the constant rotation gears so as to rotate the seedling table horizontal moving shaft at a non-constant speed by the constant speed rotational power of the output shaft on the driving side. The gear transmission mechanism is configured by a pair, and the interlocking timing between the driving side and the driven side in this gear transmission mechanism is determined by the seedling planting claw at the time when the driving speed is changed to a low speed in the cycle of the change in the driving speed transmitted to the screw shaft side. Set up so that it matches the time of seedling removal from the seedling stand. Lies in that you have. As a result of taking the above technical means, the following effects can be obtained. a. That is, a gear transmission mechanism is configured with an inconstant speed gear pair that transmits rotation so that the seedling table lateral movement shaft is rotated at a non-constant speed by the constant speed rotational power of the output shaft on the driving side, and the screw shaft is always rotated. That is, since the seedling can be taken out by decelerating the seedling stand so that the seedling stand is not completely stopped, it is easy to avoid compressing the seedling end on the seedling stand. b. Then, instead of intermittently driving and stopping the screw shaft having the endless spiral groove, the screw shaft is constantly driven to rotate through the gear transmission mechanism, so that the screw shaft and the coma are driven to rotate relative to each other. Since the drive is intermittently decelerated according to the timing of taking seedlings of the nails, there is a delay in operation or pressure due to the hydraulic structure, such as the conventional structure of hydraulic intermittent drive or intermittent relative rotation drive of the top and screw shaft. It is possible to avoid variations in the lateral feed pitch of the seedling stand caused by oil leaks, backlash or backlash in the mechanical drive system. c. Moreover, in reducing the transverse feed speed of the seedling placing table by the screw shaft, since the screw shaft itself does not have a speed reducing function, a small diameter screw shaft having a smooth spiral groove can be adopted. In other words, if only the screw shaft is used for deceleration, for example, as shown in FIG.
Part 9 other than the spiral groove parts 9a at both ends in the longitudinal direction of the endless spiral groove 9 formed in 0, the part 9 with which the top member engages at the time of separating and taking out the seedlings in accordance with the operation pitch of the seedling planting claws.
It is possible to change the feed rate by forming a part of b having a lead angle different from that of the other part 9c, but in this case, the groove portion necessary for obtaining the normal feed rate is obtained. If a sharp angle change is provided at the connection between the lead angle of and the lead angle of the groove to be decelerated, the movement of the top cannot be performed smoothly.Therefore, the screw shaft is used so that the top can be smoothly guided in both grooves. The diameter tends to be large, and the total weight tends to be large. On the other hand, in the present invention, the lateral feed speed of the seedling stand is not changed by changing the lead angle, but the unequal motion of the gear transmission mechanism is used. The lead angle can be set freely within the range that does not hinder the feeding of. Therefore, it is possible to reduce the shaft diameter by setting the lead angle to a gentle angle with a sufficiently large pitch. Effect of the Invention Above a. By the action, it is possible to avoid compaction and gaps at the end of the seedling on the seedling stand caused by repeated driving / stopping of the seedling stand, and avoiding non-uniformity in the amount of seedling picked up due to this. Easy to do. B. Above a. b. The effect of this action is to prevent the deformation of the mat-shaped seedlings due to the lateral contact between the nails and the mat-shaped seedlings while maintaining good seedling-picking performance by the nails, thus greatly improving the seedling planting performance. In addition, since the screw shaft and the top are constantly rotated relative to each other, abrasion damage in the drive system can be suppressed as compared with the case where they are intermittently driven by a cam mechanism, a ratchet mechanism, or the like. Came to. C. Above c. From the above effect, it is possible to reduce the diameter of the screw shaft and accordingly reduce the overall weight. Embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, a plurality of mat-like seedlings W are placed side by side in a planting mission case 3 which receives power transmission from a passenger vehicle through a transmission shaft 2 which can be expanded and contracted and bent. The slanted seedling stand 4 is continuously connected so as to drive and reciprocate with a constant stroke, and the lower end of the mat-shaped seedling W is passed through a notch 6 formed in a sliding frame 5 that receives and supports the lower end of the seedling stand 4. A plurality of planting claws 7 for sequentially picking out one block of seedlings for each plant by vertical circulation operation from the row and arranging them on the mud surface are arranged side by side in the lateral direction of the machine, and the seedling placing table 4 reaches the stroke end. The mat-shaped seedling W is provided with a rotary locking feeder 8 for feeding downward, and thus a seedling planting device equipped in a riding type rice transplanter is configured. The mat-like seedling W has a vertically-long rectangular floor soil A in plan view.
On the other hand, seedlings of rice are row-striped at an equal pitch P in the longitudinal direction, and seedlings are germinated, rooted, and grown. To take out the block-shaped seedlings, the block-shaped seedlings are successively block-shaped with the vertical dimension l1 of the soil A of the block-shaped seedlings being equal to 2 pitches of the seeding pitch P, and the width dimension l2 thereof being smaller than the vertical dimension l1. The vertical overlap amount of the planting claw 7 with respect to the mat-shaped seedling W at the time of taking out the seedling, and the seedling taking-out width of the planting claw 7, and the lateral feed amount of the seedling placing table 4 corresponding to it in order to take out the seedling. Is set and the floor soil A of the block-shaped seedling is taken out with a vertical dimension l1 equal to 2 pitches of the horizontal seeding pitch P, so that the mat-shaped seedling W by the rotary locking feeder 8 can be obtained.
Even if there is an error in the downward feed amount of the seedlings, the seedlings for one row of seedlings in the lowermost row can be reliably taken out, and the seedling emptying of the planting claws 7 due to the downward feed error of the mat-like seedling W is ensured. It is configured to prevent. When the seedling stand 4 is reciprocally driven, as shown in FIGS. 3 and 4, from the transmission shaft 2 to the gear type speed reducing mechanism 13.
The power of the driving side is transmitted to the seedling placing table lateral movement shaft 14 for reciprocating lateral movement operation of the seedling placing table 4 via the
Is configured to move laterally back and forth. The shaft 14 for lateral movement of the seedling stand is attached to the mission case 3 with plant,
A screw shaft 1 with left and right sides of the machine body having an endless spiral groove 9 formed on the peripheral surface.
0 is slidably supported in the longitudinal direction of the screw shaft 10 with both ends projecting from the outer side wall of the mission case 3, and the seedling stand 4 slidable in the lateral direction of the machine body is attached to the screw shaft. The screw shaft 10 is integrally connected to both projecting ends of the screw shaft 10 in a non-rotatable state, and is externally fitted to the screw shaft 10 in the planted mission case 3 so as to be rotatable relative to each other.
A top member 1 that is engaged with an endless spiral groove 9 of a screw shaft 10 and relatively moves along a cylindrical member 11 that is rotatably supported in a state of being unable to move laterally with respect to the planted mission case 3.
2 is rotatably attached around an axis orthogonal to the axis of the screw shaft 10, so that the tubular member 11 is passed through the transmission shaft 2, the output shaft 15, and the gear type speed reduction mechanism 13.
By rotating power transmitted to the top member 12 of the screw shaft 1
The seedling stand 4 is reciprocally driven integrally with the screw shaft 10 by being driven and rotated around the 0 axis center and by the engagement guide action of the top member 12 and the endless spiral groove 9. The gear type speed reducing mechanism 13 is constructed as shown in FIG. That is, the gear transmission mechanism 13
Is a pair of constantly rotating gears 13A, 1 having an elliptical outer periphery.
3B, both of these constantly rotating gears 13A, 13B
As a result, a non-constant speed gear pair that transmits the rotation so as to cause the seedling stand lateral movement shaft 14 to rotate at a non-constant speed by the constant-speed rotational power of the drive-side output shaft 15 is configured. Then, the interlocking timing of the output shaft 15 on the driving side and the shaft 14 for lateral movement of the seedling stand on the driven side with respect to the gear transmission mechanism 13 is the cycle of the change in the driving speed transmitted to the screw shaft 10 side. The time when the seedling planting claw 7 moves when the seedling planting stand 4 is moved at a low speed is set so that the time point when the seedling planting nail 4 is taken out from the seedling planting stand 4 by the seedling planting nail 7 coincides with the time point when the seedling planting claw 7 moves. The seedlings are taken out by The present invention is intended for seedling feeding devices in various types of rice transplanters such as walking type and riding type. It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings] FIG. 1 is a partially omitted side view cross-sectional view showing a seedling planting device. FIG. 2 is a schematic plan view showing a state in which seedlings are taken out by a planting nail. FIG. 3 is a plan view of a notch showing a seedling stand driving structure. FIG. 4 is a perspective view showing a seedling stand driving structure. FIG. 5 is an enlarged view of a part of a screw shaft as a comparative example. [Explanation of symbols] 4 seedling stand 7 Planted nails 9 spiral groove 9b, 9c spiral groove part 10 screw shaft 12 frames 13 Gear transmission mechanism 13A, 13B constant rotation gear 14 Seedling stand horizontal movement axis 15 Output shaft

Claims (1)

(57) [Claims] To reduce the reciprocating speed of the seedling placing table (4) in the lateral feed direction when the seedling is detached from the seedling placing table (4) by the seedling planting claw (7). A seedling feeder for a rice transplanter comprising a configured drive device, wherein the drive device comprises a seedling tray lateral movement axis (14) for laterally feeding the seedling tray (4) and the seedling tray horizontal. And a gear transmission mechanism (13) for transmitting a rotational driving force on the driving side to the moving shaft (14). The seedling table horizontal moving shaft (14) is laterally attached to the seedling table (4). A screw shaft (10) for transmitting the feed force, and the screw shaft (1
(0) is composed of an endless spiral groove (9) formed on the peripheral surface of (0), and a top (12) that relatively reciprocates and relatively rotates with respect to the screw shaft (10), and The gear transmission mechanism (13) is provided with a shaft for lateral movement of the seedling stand.
The constant rotation gear (13A) provided in (14) and its constant rotation
Driven to mesh with the rotary gear (13A) and transmit power.
A constant rotation gear (13B) provided on the drive side output shaft (15)
And the both constant rotation gears (13A) and (13B) are
The seedling stand is moved laterally by the constant speed rotary power of the output shaft (15) on the driving side.
The rotation of the drive shaft (14) is transmitted at a non-uniform speed.
The gear transmission mechanism (13) is composed of a constant-speed gear pair, and further, the interlocking timing between the driving side and the driven side in the gear transmission mechanism (13) is set to a low speed in the cycle of the change in the driving speed transmitted to the screw shaft (10) side. The seedling feeding device of the rice transplanter is characterized in that it is set so that the point of time becomes the same as the point of time of taking out the seedling from the seedling stand (4) by the nail (7) with the seedling planting.