JPH06319327A - Seedling planter - Google Patents

Abstract

PURPOSE:To reduce noise by applying an elastic member to a washer in contact with a cushioning member on the inner surface of a planting arm and fitting the elastic member into a pushing rod. CONSTITUTION:The seedling planter is obtained by fitting a washer 3 into a pushing rod 14, bringing the washer into contact with the end of a connecting member 1, interposingly installing an elastic member (3B) in the contact surface thereof through a cushioning member 19 with the inner surface of a planting arm 7 and keeping the washer and the pushing rod in a relatively fixed state by the frictional resistance of the elastic member (3B) with the pushing rod.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise caused by the operation of a seedling planting device, and more particularly to a technique for suppressing a hitting sound caused by a shocking protrusion movement of a push rod.

[0002]

2. Description of the Related Art A seedling planting device is disclosed, for example, in Japanese Patent Laid-Open No. 4-82.
As shown in Fig. 1 of Japanese Patent Publication No. 11, a push rod for pushing out a seedling grasped by a planting claw is reciprocally slidably supported by a planting arm, and a pushing movement for planting a seedling in a field is indicated by 20. The urging force of the spring indicated by is transmitted to the push rod through the cam lever indicated by reference numeral 17, and the subsequent return movement is forced by the cam mechanism utilizing the rotary cam indicated by reference numeral 21 to push the push rod. It adopts a pullback structure. Then, the washer that is in contact with the end face of the link plate 1 and the inner surface of the planting arm that are in contact with the end face of the link plate 1 are in contact with each other via the cushion rubber that is in the position of reference numeral 19. The limit is buffered.

[0003]

The cushion rubber that cushions and limits the protrusion limit also has the effect of suppressing the hitting sound at the time of a collision due to the push rod protruding movement, which is convenient, but the collision noise between the washer and the cushion rubber, There was also a collision sound between the washer and the link plate, and there was still room for improvement in this respect. An object of the present invention is to suppress the impact noise caused by the contact between the washer and the other portion to further reduce the noise caused by the planting operation.

[0004]

In order to achieve the above object, the present invention provides a push rod base end portion which can be reciprocally moved along a planting claw and a swingable cam lever via a connecting member. In addition to interlocking, actuating spring that acts on the cam lever to urge the push rod to project, and act on the cam lever to pull the pushed push rod toward the inside of the planting arm against the urging force of the actuating spring. Each of them is provided with a cam mechanism, and a pusher is fitted with a washer that is prevented from moving toward the connecting member by contact with the end of the connecting member.A cushion member between the washer and the inner surface of the planting arm is attached to the push rod. In the seedling planting device configured such that the push rod projection limit is buffered by the contact via the elastic member, the elastic member is fixed to the contact surface of the washer with the cushion member. As well as by frictional resistance between the elastic member and the push rod, characterized in that the state of relative movement between the washer and the push rod is prevented is set the shape of the elastic member. Further, it is convenient that an elastic member is provided on the contact surface of the washer with the connecting member.

[0005]

When the push rod is projected and moved, the washer and the connecting member come into contact with each other, but in the past, the washer was movable in the longitudinal direction of the push rod. There was a case where the object moved with the member and a rubbing sound with the push rod or a contact sound with the connecting member was generated. Further, since the contact surface of the washer is flat, a tapping sound may be produced due to the applause principle when the washer collides with the cushion member. According to the structure of claim 1, the washer and the cushion member come into contact with each other via the elastic member, that is, the elastic members collide with each other to reduce the shock and the tapping sound. In addition, since the elastic member can prevent relative movement between the washer and the push rod, that is, the displacement movement, the washer can be held at the position where it is brought into contact with the connecting member, and the friction noise with the push rod during operation of the device and It is possible to almost eliminate the collision sound with the connecting member.

According to the second aspect of the invention, since the elastic member is also interposed between the washer and the connecting member, it is possible to reduce the generation of a minute hammering sound between the washer and the connecting member due to mechanical vibration.

[0007]

Therefore, in the seedling planting device according to any one of claims 1 and 2, the noise caused by the collision between the washer and the member such as the cushion member and the connecting member is suppressed by the modification in which the elastic member is fixed to the washer. In addition to the reduction of the planting noise, the second aspect has an advantage that the noise due to the contact between the connecting member and the washer is further reduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a main part of a seedling planting device in a walk-behind rice transplanter. That is, the planting arm 7 provided with the seedling planting claws 6 is swung up and down through the drive rotation link 8 and the swing link 9 in the planting case (not shown) that receives the power of the engine. They are connected as shown. Then, by swinging the planting arm 7, the seedling planting claw 6 reciprocates up and down between the vicinity of the lower end of the seedling stand 4 and the field with the tip drawing a loop locus T, and the seedling stand 4 is moved. A rail for cutting out one block of block-shaped seedlings from the lower end of the mat-shaped seedling 11 placed on the table, and slidably supporting the lower ends of the mat-shaped seedling 11 and the seedling stand 4 in the lateral direction of the machine body. Through the seedling take-out port 13 formed in the member 12, it is descended and planted in the field mud.

A seedling pushing tool 15 is attached to the planting arm 7 so as to slide in the longitudinal direction along the seedling planting claw 6 via a seedling pushing push rod 14, and a link 16 is attached to the push rod 14. A cam lever 17 for operating the seedling pushing tool, which is interlocked with each other, is installed in the planting arm 7 so as to be swingable around a support shaft 18. Then, the washer 3 on the link 16 side is brought into contact with cushion rubber (corresponding to a cushion member) 19 as an elastic member, and the push rod 14 is pressed until the rod support end surface 5 of the arm 7 and the washer 3 are compressed. The operating spring 20 is caused to act on the cam lever 17 so that the seedling pushing tool 15 is pushed to a working position near the tip of the seedling planting claw 6 by operation. A rotating cam 21 for operating the cam lever 17 against the actuating spring 20.
8 for connecting the drive rotation link 8 to the planting arm 7.
The cam mechanism A is configured so as to be integrally rotatable with a. In other words, the seedling planting nail 6 is located at the base end side of the seedling planting nail 6 at the time of taking out the seedlings and when descending, and when the seedling planting nail 6 is planting seedlings, the working position becomes the working position. The seedling pushing tool 15 is slidably operated in association with the seedling planting movement of the seedling planting claw 6 so as to push out the retained seedlings.

As shown in FIG. 2, the link 16 is composed of a pair of link plates (corresponding to connecting members) 1, 1 and pins 2, 2, and the base end portion of the push rod 14 connecting the links 16 has a sectional shape. It is flat processed into an oval shape. A ring-shaped cushion rubber 19 is fitted on the push rod 14, and a washer 3 is interposed between the cushion rubber 19 and the link 16 to wash the end face of the link 16 and the rod support surface 5 with each other. Three
Also, the push rod 14 has a structure in which the push limit of the push rod 14 is regulated by abutting it via the cushion rubber 19.

As shown in FIGS. 2 to 5, the cushion rubber 19 has an inner diameter slightly larger than the outer diameter of the push rod 14 in the free state, and is always attached to the rod supporting end surface 5 side by its own weight. To exist. As a result, the cushion rubber 19 does not move with the shocking protrusion movement of the push rod 14, and the inertia is reduced as much as possible. The cushion rubber 19 has a contact surface 22 with the rod supporting end surface 5 and an opposite contact surface 23,
The center portion in the radial direction is formed into a convex curved surface that is most raised with a large radius of curvature, and a plurality of protrusions 23a are circumferentially formed on the anti-contact surface 23 in order to prevent the above-mentioned increase in inertia by adhering to the washer 3. Are formed at appropriate intervals.

Further, as shown in FIG. 2, the washer 3 is made of metal and is loosely fitted to the push rod 14, and the washer body 3 is loosely fitted therein.
A and a holding portion (corresponding to an elastic member) 3B made of soft rubber and having an inner diameter smaller than the outer diameter of the push rod 14 are fixedly integrated by baking (or bonding). In other words, due to the frictional resistance due to the press-fitting dimension setting of the holding portion 3B with respect to the push rod 14, a holding action is generated in which the washer 3 and the push rod 14 are not displaced relative to each other, and the washer 3 can be held in contact with the end surface of the link plate 1. Is done. In addition, as shown in FIG.
The hole of the washer body 3A is formed in an oval shape that fits into the base end of the push rod 14. Although soft rubber is effective in reducing impact noise, there is a problem that if the rubber thickness is thick, the amount of compressive deformation is large and it breaks easily, and if the rubber thickness is thin, it is hard to crack and has good durability, but it is also easy to tear. Sufficient durability can be obtained if the washer body 3B is firmly fixed and integrated.

When the push rod 14 is projected, the cushion rubber 19 is deformed laterally in both the inner diameter direction and the outer diameter direction, so that a gentle rise of the load allows the shock to be smoothly absorbed and alleviated. Since the contacting is started from the member intermediate portion, which is a portion in which lateral deformation is less likely to be biased to one side, the cushion rubber 19 is less partially deteriorated and the durability is improved.
Further, the washer 3 and the cushion rubber 19 come into contact with each other with the rubber holding portion 3B sandwiched therebetween, so that the tapping sound is further reduced.

[Other Embodiment] As shown in FIG.
The rubber of B is extended and equipped with the ring portion 3r of the push rod insertion hole portion and the upper surface portion (elastic member) 3u of the contact surface on the link plate 1 side.
The washer 3 configured to reduce the rubbing sound with the contact plate 4 and the contact sound with the link plate 1 may be further reduced, and the planting noise can be further reduced.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a seedling planting device.

FIG. 2 is an enlarged cross-sectional view showing a push rod base end portion.

FIG. 3 is a plan view of a single elastic member.

FIG. 4 is a diagram showing a dimensional relationship between a washer and a push rod.

FIG. 5 is a partially cutaway plan view of the washer.

FIG. 6 is a sectional view showing another structure of the washer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection member 3 Washers 3B, 3u Elastic member 6 Planting claw 7 Planting arm 14 Push rod 17 Cam lever 19 Cushion member 20 Actuating spring A Cam mechanism

Claims (2)

[Claims] 1. A base end portion of a push rod (14) which can reciprocate along a planting claw (6) and a swingable cam lever (17) are interlockingly coupled via a coupling member (1). At the same time, an actuating spring (20) that acts on the cam lever (17) to urge the push rod (14) to project.
And a cam mechanism (A) that acts on the cam lever (17) so as to pull the pushed push rod (14) inward toward the planting arm (7) against the biasing force of the actuating spring (20). And a washer (3) in a state in which the push rod (14) is prevented from moving toward the connecting member (1) by contact with the end of the connecting member (1), The contact between the washer (3) and the inner surface of the planting arm (7) via the cushion member (19) causes the push rod (14) to have a protruding limit that is buffered. A planting device, comprising: the cushion member (1) in the washer (3).
9) The elastic member (3B) is fixed to the contact surface with the elastic member (3B) and the push rod (14).
The seedling planting device in which the shape of the elastic member (3B) is set such that the washer (3) and the push rod (14) are fixed relative to each other by the frictional resistance with. 2. The seedling planting device according to claim 1, wherein an elastic member (3u) is provided on a contact surface of the washer (3) with the connecting member (1).