JPH04656Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a lifting pawl buffer device in a grain culm lifting device that can be employed in a harvester or the like.

[Prior art]

As shown in Fig. 1, this type of conventional grain culm lifting device consists of vertical lifting cases 1, 1, which are arranged oppositely on the front side of the machine in a pair of left and right sides, and each of these lifting cases. A chain 4 is wound around a sprocket 2 disposed on the upper part of the sprocket 1 and a sprocket 3 disposed on the lower part of the sprocket 1, and a plurality of synthetic resins are rotatably connected to the chain 4 at predetermined intervals. It is composed of the raising claws 5, 5, . . .

Each of the lifting pawls 5 stands up around the lower sprocket 3, and in the lifting path 6 in which the lifting pawls 5 move in the upward direction together with the chain 4 in the direction of the arrow from the upright starting end position A, the lifting pawls 5 are restricted. Side 5
A is raised and guided by a guide 7 fixed to the case, thereby being regulated to the upright state.

After pulling up the grain culm, the lifting pawl 5 in the upright state collapses at the terminal end B of the guide 7, and the lifting pawl 5 in the collapsed state reaches the upper sprocket via the remaining ascending path 8. 2, moves in the downward direction and reaches the upright starting end position A, and is in a lying state.

By the way, when the lifting pawl 5 that has fallen down at the terminal end B of the guide 7 goes around the upper sprocket 2 via the ascending path 8, it becomes upright again due to the rotational inertia caused by the rotation of the sprocket 2. As it moves, above sprocket 2,
In order to reduce the height of the lifting case 1 above the center of the sprocket 2 as much as possible, a buffer 9 made of a material such as rubber is provided to guide the rising lifting pawl 5 in a predetermined direction by colliding with it. This shock absorber 9 is fixed by a mounting bolt 10 that connects the front and rear lifting cases 1a and 1b through a hole drilled in the mounting part 9a, and the guide part 9b following the mounting part 9a is diagonally downward. By tilting it towards the lower end, the lifting case 1 on the side where the lifting claw 5 collapses and descends can be made more compact.

However, the raising claw 5 returns to the upright state.
However, when the shock absorber 9 directly collides with the mounting part 9a of the shock absorber 9, a hard sound is generated, and this impact sound becomes a harsh noise to the worker's ears, and the lifting case 1
However, it also had the disadvantage of generating vibrations.

In addition, according to Japanese Utility Model Application Publication No. 56-71129, a rubber soundproofing device having a plurality of elastic tongues with which the tip of the protruding claw successively abuts is provided on the outside of the collapsed portion of the protruding claw. A device has been proposed, but this device only has a relatively short tongue located on the uppermost side in the direction of chain rotation extending in a straight line.
Even if a shock absorbing member made of the same material is used, the spring constant will be large, vibration transmission to the mounting part will be large, and the contact sound will be harsh, which will still result in harsh noise and the above problem cannot be solved. Ta.

Furthermore, according to Japanese Utility Model Publication No. 58-1132, a rubber shock absorber formed by extending an annular contact part from a boss part is provided on the outside of the lifting pawl that the fallen lifting pawl comes into contact with at the upper part of the inside of the lifting case. A device in which multiple pieces are installed at intervals has been proposed, but this device has a fairly high spring constant because a closed loop is formed between the boss and the annular contact portion that contacts the lifting claw. Become something. Therefore, if the wall thickness of this annular abutting part is made thinner, the durability will be reduced, making it difficult to obtain the optimum spring constant. Because of the abutment, it is also difficult for this type of device to significantly reduce the harsh noise. Furthermore, this shock absorber has a complicated structure, making it difficult to manufacture and complicated to install.

Therefore, in view of the problems of the conventional devices mentioned above, the present invention has been developed to create a grain culm lifter that can make the impact sound when the lifting claw collides with the buffer to a softer sound so that it does not irritate the ears of the operator. The object of the present invention is to provide a lifting pawl shock absorbing device for a device.

[Structure of the idea]

In order to achieve the above object, the lifting pawl buffer device in the grain culm lifting device according to the present invention lifts a chain in which a plurality of lifting pawls are pivotally connected so as to be freely erectable, and is installed inside a case. In the grain culm lifting device, the grain culm is pulled up by a guide with a lifting pawl in an upright state when the chain moves upward, and then brought into a collapsed state by bringing the lifting pawl into contact with a buffer when moving downward. A U-shaped part that protrudes upward from the mounting part in the direction of chain rotation and is folded back toward the upper sprocket, with the shock absorber being bolted at one location on the upper sprocket as a base, and the U-shaped part. a first buffer guide part that is connected to the mounting part and has a predetermined interval therebetween and covers the mounting part and is in contact with the lifting claw; It consists of a buffer guide section.

Since the present invention is constructed as described above, the tip of the lifting claw 5 comes into contact with the soft U-shaped part 14 constituting the first buffer guide part 13 and is buffered while deforming it. Since the terminal end of the U-shaped portion 14 orbits the upper part of the upper sprocket 2 while contacting the surface of the second buffer guide portion 9b, the lifting pawl 5 is continuously subjected to a buffering action, unlike the conventional It is possible to significantly reduce impact noise compared to other devices.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 3 and 4. In the present invention, the shock absorber 9 made of an elastic material such as a rubber material is attached to the upper sprocket 2.
A mounting tool 9a is provided which is fixed by a mounting bolt 10 provided at one place on the upper part of the
There is a first buffer guide portion 1 which protrudes upward in the rotational direction of the chain 4 from this point and bends back to the sprocket 2 side via the curved portion 12.
3 is provided, and this U-shaped portion 14 is thinner than a second buffer portion 9b, which will be described later. A predetermined space L is connected to this U-shaped portion 14 and the second buffer portion 9b is connected to the outer diameter of the mounting portion 9b.
The first buffer guide part 13 having a predetermined space H between
is provided, and this first buffer guide part 13 is connected to the mounting part 9.
a, and the tips of the lifting claws 5 are continuously brought into contact with each other.

Further, a second buffer guide part 9b is connected to the attachment part 9a, which hangs downward in the rotational direction of the chain 4 and is continuous with the folded end of the first buffer guide part 13 described above.

Therefore, when the raising pawl 5, which has once fallen down at the terminal end B of the guide 7, goes around the upper sprocket 2 via the ascending path 8, it stands up again due to the rotational inertia caused by the rotation of the sprocket 2. When this occurs, the lifting pawl 5 does not directly collide with the tip of the attachment portion 9a as in the conventional case, but instead moves upward in the direction of rotation of the chain 4 than the attachment portion 9a, as shown by the chain line in FIG. U-shaped part 1 protruding to the side
It collides with the tip of 4 and is initially buffered.

During this initial buffering, the U-shaped portion 14
Since it is connected to the first buffer guide part 13 having a cavity in the space L between the guide part a and the space H between the guide part 9b, the lifting claw 5 when colliding with the U-shaped part 14 It is received softly, and the contact sound is not a hard and heavy sound like the conventional one when directly colliding with the mounting part 9a, and furthermore, it does not propagate to the lifting case 1 and generate vibration.
It can produce a soft and light sound.

Moreover, although the hollow U-shaped portion 14 is provided to make the initial cushioning effective, this U-shaped portion 14
The first buffer guide portion 13 extends to the character-shaped portion 14
When the lifting claw 5 continues to move as shown by the dotted line in FIG. It passes smoothly, passes through the first buffer guide part 13 that is continuous with the U-shaped part 14, and is continuously transferred to the second buffer part 9b for buffering. The pushed-up first buffer guide part 13 receives the lifting pawl 5 so as to press it down, and the horizontal swinging and rebounding of the lifting pawl 5 are eliminated, and noise and vibration can be significantly reduced.

Therefore, the contact sound when the raising claw 5 collides with the shock absorber 9 can be made into a soft and light sound, so that it does not irritate the ears of the operator.

[Effect of idea]

In the claw buffer device of the grain culm lifting device according to the present invention, a plurality of lifting claws pull up a chain which is pivotally connected in a freely undulating manner, is housed in a case, and is pulled up by a guide when the chain moves upward. In the grain culm lifting device, the grain culm is pulled up with its claws in an upright state, and then brought into a laid down state by bringing the lifting claws into contact with a buffer during downward movement. A U-shaped part that protrudes upward from the mounting part in the direction of chain rotation and is folded back toward the upper sprocket, with the mounting part bolted at a certain point as a base point, and a U-shaped part connected to the U-shaped part and connected to the above-mentioned mounting part. It is composed of a first buffer guide part that covers the mounting part with a predetermined interval therebetween and is in contact with the lifting claw, and a second buffer guide part that continues from the mounting part and hangs downward in the direction of rotation of the chain. .

Therefore, when the upper sprocket goes around the upper sprocket once it has fallen down, the raising pawl, which returns to the upright state and tries to turn due to the rotational inertia caused by the rotation of the upper sprocket, can be prevented by bolting at one point on the upper sprocket. By making contact with the U-shaped part that protrudes upward from the fixed mounting part in the direction of chain rotation and folds back toward the upper sprocket side, the contacting lifting pawl has a distance from the mounting part to the contact point. It becomes longer, has a smaller spring constant, and can effectively provide a buffering effect.

Furthermore, a first buffer guide part is connected to this U-shaped part, which covers the mounting part with a predetermined gap between it and the mounting part, and which the lifting claw comes into contact with.
Since the contact sound of the pulling claw when it collides with the character-shaped part can be made soft and light, it is possible to eliminate the harsh sound to the operator's ears.

Moreover, the first buffer guide part connected to the U-shaped part is deformed and pushed up, allowing the raising pawl to pass through as if being pushed in, and is further transferred from the U-shaped part to the second buffer guide part through the first buffer guide part. By peeling it off, it is possible to buffer the lifting claw with less noise and vibration without causing it to swing laterally or bounce back.

In particular, the present invention simplifies the structure by integrally providing a first buffer guide section having a U-shaped portion on one side of one mounting section and a second buffer guide section extending on the other side. In addition to being easy to manufacture, it is easy to install and
This has the effect of making the conversion work easier.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional example, in which Figure 1 is a front view of the grain culm lifting device with the lifting case cut away, and Figure 2 is a front view of the grain culm lifting device showing the attachment part of the buffer. FIG. 1 is an enlarged cross-sectional view taken along line X-X in FIG. 1; Figures 3 and 4 show one embodiment of the present invention, with Figure 3 being a front view of the grain culm lifting device showing only the main parts, and Figure 4 showing the buffer. Te, A
is a plan view, B is a front view, C is a back view, D is a left side view, and E is a right side view. 2... Upper sprocket, 3... Lower sprocket, 4... Chain, 5... Lifting pawl, 9... Buffer, 9a... Mounting part, 9b... Guide part, 13...
...tongue, 14...U-shaped part.

Claims (1)

[Scope of utility model registration request] A chain in which a plurality of lifting claws are pivotally connected in a freely erectable manner is raised and placed inside a case, and when the chain is moved upwardly, the chain is raised by a guide to bring the claws into an upright state and the grain culm is raised; In a grain culm lifting device that brings a lifting pawl into contact with a buffer during downward movement to bring it into a laid down state, the buffer is moved from a mounting portion bolted at one location on the upper sprocket as a base point, and from the mounting portion. A U-shaped part that protrudes upward in the direction of chain rotation and is folded back toward the upper sprocket, and a lifting claw that covers the mounting part and is connected to the U-shaped part with a predetermined distance from the mounting part. A lifting pawl buffer device in a grain culm lifting device, which is formed of a first buffer guide portion that abuts, and a second buffer guide portion that hangs downward in the chain rotation direction following the mounting portion.