JPH08205644A - Seedling planting device - Google Patents

Abstract

PURPOSE: To provide a seedling planting device applicable even to large-sized seedlings as far as possible without involving a larger-sized rotary case while taking an advantage by simplifying the transmission mechanism owing to cam structure. CONSTITUTION: A reversing gear A to rotate planting arms 6 reversely to a driving shaft 8 with the revolution of the driving shaft 8 is set inside a rotary case 11 bearing a pair of the planting arms 6, 6, where this reversing gear A is made up of a circularly barrel-shaped eccentric member 9 having an axial center Y different from the axial center X of the driving shaft 8 and fixed on a planting case 3, a revolving member 19 externally engaged, with the eccentric member 9 in a relatively revolvable way, an eccentrically revolving mechanism (a) formed by pivotting the revolving member 19 on a crank shaft 21 bearing a 1st gear 20, and an interlocking mechanism (b) of a non-circular gear interlocking mechanism designed to connect the 1st gear 20 interlockingly with the support shaft 12 of the planting arms 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seedling planting device capable of making a rotating case compact.

[0002]

2. Description of the Related Art For example, Japanese Patent Application No. 5-297 filed previously.
In the planting device shown in No. 719, the drive shaft in the center of the rotating case and the cam shaft of the planting arm are connected by a rod via an eccentric groove cam mechanism, so that the planting arm rotates as the rotating case rotates. There has been proposed a technique for simplifying the internal drive structure of the rotating case while rotating the reverse rotation to operate the planting claw in a desired locus.

[0003]

That is, in the above-mentioned technique, it is possible to replace a large number of gear-related parts internally mounted in the conventional rotating case with a simple cam mechanism. Also, the rotating case for accommodating the operation arm of the camshaft tends to be somewhat larger in radial width. Therefore, for example, in a planting device using a long rotating case between a pair of planting arms suitable for planting large seedlings, the planting device having the above-described structure also has a radial width of the rotating case along with its lengthening. There is a tendency to considerably increase the size. When the size of the rotating case increases, the rotating case and the paddy field easily come into contact with each other due to planting, and unnecessary dirt is scraped off, or the rotational inertia of the rotating object is increased or decreased. It is disadvantageous in that strength measures are needed, and there seems to be room for improvement. An object of the present invention is to provide a seedling planting device that can be applied to large seedlings with the advantage that the power transmission structure can be simplified by the cam structure and the rotation case is not enlarged as much as possible.

[0004]

In order to achieve the above-mentioned object, the present invention provides a rotating case in which a pair of planting arms are supported at both ends and are attached to a drive shaft of the planting case in an integrally rotating state. , A reversing device for rotating the planting arm in a direction opposite to the rotation direction of the drive shaft as the drive shaft rotates, the reversing device having a shaft center different from that of the drive shaft, and An eccentric rotating mechanism including an eccentric member fixed to the attached case, a rotating member fitted to the eccentric member so as to be rotatable relative to the eccentric member, and an interlocking member crank-connected to the rotating member, and It is characterized in that it is constituted by an interlocking mechanism for interlockingly connecting the interlocking member and the support shaft of the planting arm.

[0005]

In other words, the conventional eccentric groove cam mechanism is composed of the eccentric rotation mechanism and the interlocking mechanism, is a portion that is bulky in the radial direction, and the movement locus necessary for the planting claw is revealed. The eccentric rotation mechanism that plays a role in storing is stored in the central part (drive shaft part) of the rotating case, and the relatively non-interlocking mechanism that only transmits rotation such as gear interlocking and shaft transmission is stored in the tip part of the rotating case. Will be done. Therefore, in order to increase the size of the rotating case so that it can be applied to large seedlings, it is sufficient to extend the interlocking mechanism portion, which is a portion that is difficult to be bulky, and it is possible to set the state where the mass increase on the tip side of the rotating case is as small as possible. The rotational moment of inertia of an object is proportional to its mass, and
Since it is proportional to the square of the diameter, it is possible to prevent the driving load from becoming too large even if the rotating case is lengthened, and it is also possible to prevent the tip of the rotating case from becoming compact and increasing the chances of contact with the rice field.

[0006]

As a result, the eccentric rotation mechanism is arranged in the center of the rotation case, and the mechanism for interlocking the eccentric rotation mechanism and the cam shaft is interlocked with each other to simplify the internal structure of the rotation case while driving. We were able to provide a seedling planting device that can easily change the specifications for large seedlings without the need for significant strength measures and with minimal disadvantages in load and rotational inertia.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 shows the main part of the planting device of the rice transplanter, 1 is a frame frame (toolbar) with square pipes, 2 is a planting mission case, 3 is a planting case, 4 is a seedling stand, 5 is planting. The mechanism 23 is a float.

Next, the structure of the planting mechanism 5 will be described. As shown in FIGS. 2 and 3, the planting mechanism 5 includes one planting case 3, one rotating case 11, and a pair of planting arms 6 supported at both ends of the rotating case 11. It is configured. The drive shaft 8 at the tip of the planting case 3 penetrates the rotary case 11, is fitted and connected to the side wall portion thereof in an integrally rotatable state, and is externally fitted to the drive shaft 8 so as to be relatively rotatable, and is planted. The cylinder shaft 7 bolted to the case 3
Are engaged with an eccentric member 9 described later. Further, the cam shaft 10 extending from the planting arm 6 penetrates the rotating case 11, is fitted and connected to the side wall portion thereof in an integrally rotatable state, and is externally fitted to the cam shaft 10 so as to be relatively rotatable. ,
In addition, a support shaft 12 that is non-rotatable relative to the planting arm 6 by a pin 13 is extended in the rotating case 11, and a third gear 18 described later is externally fitted and mounted in an integrally rotating state.

As shown in FIG. 5, in the planting arm 6,
Push rod 1 with push-out tool 14a attached to the tip
4, an operating arm 15 swingable around an axis P for moving the push rod 14 back and forth, and a compression spring 16 for projecting the push rod 14 are provided.
The relative rotation of the cam shaft 10 with the cam shaft 10 causes the operation arm 15 that slidably contacts the cam portion 10a to oscillate, so that the operation arm 15 moves the bottom end position of the planting movement locus where the planting claw 17 reaches the mud surface. A well-known operation is performed in which the retracted posture of the push rod 14 is rapidly released and the seedlings are impulsively pushed out by the compression spring 16 to be planted on the field surface.

As shown in FIGS. 2 and 3, the rotating case 11
A reversing device A for rotating the planting arm 6 in a direction opposite to the rotation direction of the drive shaft 8 as the drive shaft 8 rotates is installed inside. The reversing device A has an axis Y different from the axis X of the drive shaft 8 and is fitted to the eccentric member 9 and the eccentric member 9, which are relatively fixed to the planting case 3, and are rotatable relative to the eccentric member 9. An eccentric rotation mechanism a including a rotating member 19 and a first gear (corresponding to an interlocking member) 20 crank-connected to the rotating member 19; It is configured by an interlocking mechanism b that interlocks and connects the support shaft 12 that is dynamically connected.

The eccentric rotation mechanism a is composed of a circular drum-shaped eccentric member 9, a rotation member 19 which is fitted on the eccentric member 9 so as to be rotatable relative to the eccentric member 9, and a pair of arms 19b and 19b. And a crankshaft 21 pivotally attached to the arm portion 19b and supporting the first gear 20. The interlocking mechanism b is composed of a first gear 20, a third gear 18, and an intermediate second gear 22 that meshes with these both gears 20, 18, and the circular movement of the rotating member 19 is shown in FIG. In addition, the first to third gears 20, 22, and 18 are configured as non-circular (oval) gears so as to have a vertically long and substantially oval planting movement trajectory suitable for planting.

According to the above construction, when the rotating case 11 is rotated by the drive shaft 8, the eccentric rotation mechanism a functions to extract the power of the rotation reverse to that of the rotating case 11 to the first gear 20, and the power is generated. Is transmitted to the planting arm 6 after being deformed by the interlocking mechanism b, and a substantially oval planting movement locus at the tip of the planting claw 17 can be revealed.

[Embodiment] As shown in FIG. 4, a small-diameter eccentric drum 24 is provided in place of the eccentric member 9, and is attached to the rotary shafts 20a of both first gears 20, respectively, and these three Alternatively, a compact eccentric rotation mechanism a may be used in which a case member 25 that rotatably supports the same eccentric drum 24 having a small diameter is provided. That is, when the rotating case 11 rotates via the drive shaft 8, the eccentric drums 24, 24 on the left and right sides take the same posture as the central position-fixing eccentric drum 24 via the case member 25, whereby the rotating shaft 20a is rotated.
Will rotate in the opposite direction with respect to the rotating case 11, and as a result, the pair of planting arms 6 and 6 can be driven by the planting movement locus. Eccentric drum 2 in this case
4 has a smaller diameter than the eccentric member 9 in the structure of the present embodiment, and the rotating case 11 can be further downsized.

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 seedling plant

FIG. 2 is a side view showing the movement locus of the planting arm and the structure of the reversing device.

FIG. 3 is a plan view of a partially cutout showing a support structure for a planting arm.

FIG. 4 is a side view showing an eccentric rotation mechanism having another structure.

FIG. 5 is a cross-sectional view showing the internal structure of the planting arm.

[Explanation of symbols]

 3 Case with plantation 6 Arm with plant 8 Drive shaft 9 Eccentric member 11 Rotating case 12 Support shaft 19 Rotating member 20 Interlocking member A Reversing device X, Y axis center a Eccentric rotating mechanism b Interlocking mechanism

Claims (1)

[Claims] 1. A pair of planting arms (6), (6) are supported at both ends, and a drive shaft (8) of the planting case (3).
To the rotating case (11) that is attached to the
A reversing device (A) for rotating the planting arm (6) in a direction opposite to the rotation direction of the drive shaft (8) in association with the rotation of the drive shaft (8) is installed, and the reversing device (A) ) Has an axis (Y) different from the axis (X) of the drive shaft (8), and the planted case (3)
An eccentric member (9) fixed to the eccentric member, and a rotating member (19) fitted to the eccentric member (9) so as to be rotatable relative thereto.
An eccentric rotation mechanism (a) consisting of an interlocking member (20) crank-connected to the pivoting member (19), and a support shaft (12) for the interlocking member (20) and the planting arm (6).
A seedling planting device configured by an interlocking mechanism (b) that interlocks with and.