JPH022190Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is used in reaping machines such as combines, and is particularly applicable to mowers in which a cutting blade is provided above a fixed receiving blade and slides from side to side. This relates to a blade drive device.

(Prior Art) The above-mentioned conventional cutting blade drive device is designed to cause the knife head attached to the cutting blade to reciprocate by rotating a drive pin provided at the end of a drive arm that is pivotally supported on a frame. It is known that the knife head is driven by inserting a drive pin from above into the engagement groove of the knife head at right angles or at a receding angle.

(Problem that the invention aims to solve) However, the upper part of the cutting blade is a passage for transporting the harvested grain culm backwards, and a grain culm conveying device, etc., which is brought close to the cutting blade, is installed in this part. It is being

On the other hand, the larger the distance between the drive pin and the cutting blade attachment point of the knife head, the larger the force couple generated on the sliding parts of the cutting blades, etc., and the greater the wear and deformation of the sliding parts. It is necessary to shorten the distance as much as possible, but as mentioned above, there is a grain culm conveying device above the cutting blade, and to avoid this, it is impossible to shorten the distance between the drive pin and the fixed point of the knife head. There were flaws.

On the other hand, it is conceivable to install the drive arm below the cutting blade device and drive the cutting blade by fitting the drive pin into the engagement groove of the knife head from below the knife head, but in this case, the drive arm is connected to the cutting blade. There is a concern that the cutting blade may be exposed to a large extent below the device and come into contact with the cut stump, making it impossible to drive the cutting blade smoothly.

The technical problem with the present invention is that the drive arm for driving the cutting blade is provided below the cutting blade device so that the grain culm above the cutting blade can be transported without any hindrance. without being significantly exposed to
The objective is to shorten the distance between the drive pin and the fixed point of the knife head as much as possible, thereby reducing wear and deformation of the sliding part.

(Technical means for solving the problem) A cutting blade drive device for a reaper according to the present invention, which was taken to solve the above problems, is as follows.

In a cutting blade device mounted on a frame with a raking conveyance device close to the top and having a plunge angle to the ground, a cutting blade that slides from side to side above a fixed receiving blade of the cutting blade device. The drive pin of the drive arm, which is pivotally supported on the frame, is inserted from below into the long groove in the longitudinal direction of the knife head, which has its base attached to the cutting blade and extends rearward, and the angle between the drive pin and the knife head is adjusted. The drive arm and the cutting blade device are brought close to each other by intersecting each other at an acute angle tilted forward, and the cutting blade is reciprocated by rotation of the drive arm.

(Function) The cutting blade moves back and forth from side to side by the rotation of the drive pin inserted from below into the long groove of the knife head attached to the cutting blade, and as the machine moves forward, the harvested grain culm is transferred to the upper part of the cutting blade. It is guided by a star wheel and is smoothly transported backwards.

At this time, the distance between the drive pin and the fixed point of the knife head is shortened as much as possible to reduce the magnitude of the couple applied to the sliding part of the cutting blade.
The cutting blade drive device operates smoothly without wear or deformation of the sliding parts.

(Example) An example of the present invention will be described based on the drawings.
Reference numeral 1 denotes a plurality of vertical frames installed in the front and back direction of the cutting conveyance section mounted on the front part of the combine, and a divider is provided at the tip of the frame where it touches the ground, and a cutting blade device 2 is installed between the midpoints. is installed horizontally.

Reference numeral 3 designates a blade support for the cutting blade device 2, and its both ends are screwed to a bracket 1a fixed to the vertical frame 1 from below via a collar 4 with bolts 5.
In the attitude where the divider is in contact with the ground, the fixed catch blade 6 riveted above the tip of the catch blade stand 3 has a plunge angle α with respect to the ground, and there is an appropriate distance between the tip of the fixed catch blade 6 and the ground. N.

Reference numeral 7 denotes a cutting blade made up of a plurality of triangular-shaped knives arranged horizontally and connected by a knife bar 8 provided on the back side, and the knife bar 8 is fixed to the rear edge of the stationary receiving blade 6 and the rear part of the receiving blade stand 3. The cutting blade 7 is fitted into a horizontal groove formed between the guides 9, and the entire cutting blade 7 can reciprocate from side to side while its upper side is supported by a blade holder 10 whose base is attached to the guide 9.

A knife head 11 has a base attached to the cutting blade 7 and extends rearward, and has a long groove 11a formed in the front-rear direction.

Reference numeral 12 denotes a horizontal frame connecting the vertical frames 1 behind the cutting blade device 2, and a support shaft 14 of a bell crank 13 is fixed to a bracket 12a protruding forward and downward from the horizontal frame 12 with a nut 14a. There is. At the tip of the drive arm 15 protruding forward of the bell crank 13, a drive pin 17, on which a collar 16 is rotatably fitted, is fixed with a nut 17a.
7 is fitted from below so that its collar 16 is guided by the long groove 11a of the knife head 11. Then, the drive pin 17 is set so that the gap M between the tip of the drive arm 15 and the blade rest 3 is narrow enough to not hinder the operation of the drive arm 15.
is inclined forward at an acute angle β with respect to the knife head 11, thereby shortening the distance L between the intersection P and the cutting blade attachment portion Q of the knife head 11 as much as possible.

The drive arm 15 is disposed in a space formed at the rear of the cutting blade device 2 having a plunge angle α with the ground, and is also tilted forward with respect to the knife head 11, so that the lower end of the drive pin 17 That is, nut 17a
The gap S between the part and the ground is larger than the gap N between the tip of the fixed receiving blade and the ground, and this part does not touch the ground or press down on the stump.

As shown in FIG. 3, the drive pin 17 is provided with an oil storage portion 17b that communicates with the inner surface of the collar 16.
By filling the flangeed plug 18 with grease, wear on the joint surfaces can be prevented for a long period of time.

A rod 21 is connected rearward to the tip of the passive arm 19 projecting in the lateral direction of the bell crank 13 via a ball joint 20. A T-shaped joint 22 provided at the rear end of the rod 21 It is connected to a metal 25 of a crank pin 24a of a crankshaft 24 that is pivotally supported by a blade drive metal 23. Rotation of the crankshaft 24 causes the rod 21 to reciprocate back and forth, and as a result, the drive pin 17 moves forward and backward. Support shaft 14
The blade 7 slides in the long groove 11a of the knife head 11 while swinging from side to side, causing the cutting blade 7 to reciprocate from side to side.

A grease nipple 21a is provided midway in the length direction of the rod 21, and an oil hole communicating with this and the ball joint 20 and T-shaped joint 22 is provided to lubricate the grease nipple 21a. If this is done, it is not necessary to remove the boot of the ball joint 20 and the cover of the T-shaped joint 22 one by one to apply oil.

The bell crank 13 is further provided with a rear arm 26 that projects rearward and is displaced 180 degrees with respect to the drive arm 15, and its tip is linked to a piston 28 of a hydraulic balancer 27 attached to the lower surface of the horizontal frame 12. 29, and the piston 28 is configured to reciprocate in a direction parallel to and opposite to the operating direction of the cutting blade 7 as the bell crank 13 rotates. The balancer 27 consists of a cylinder 30 into which a piston 28 is fitted, and an oil reservoir 31 provided on one side of the cylinder 30.
A bypass port 32 that communicates largely at the center and throttle ports 33a and 33b that communicate smallly at both dead centers of the piston 28 are provided between the two, and as shown in FIG. When moving to the left from the center (position C), the oil on the left side of the piston 28 easily moves to the right side of the piston 28 via the bypass port 32, so the piston 28 moves to the left without receiving large resistance. When the piston 28 approaches the left dead center (position A), the bypass port 32 is blocked by the piston 28, and the compressed oil on the left side escapes into the oil reservoir 31 through the small throttle port 33a. At this time, rightward resistance is applied to the piston 28, and a leftward impact load is applied to the balancer 27 body.

Next, when the piston 28 starts moving to the right and oil is injected from the throttle port 33a, the piston 28
As pressure is applied to the left side, hydraulic balancer 2
7 A rightward impact load is applied to the main body, and when the piston 28 moves and is applied to the bypass port 32, oil flows through the bypass port 32 to the piston 2.
Since it enters the left side of piston 8, the resistance to piston 28 decreases.

In this way, the hydraulic balancer 2
An impact load is applied to the blade 7, but this impact load is applied to the cutting blade 7.
As it reciprocates from side to side, the impact load generated by penetration and sliding resistance acts in the same and opposite direction at its end, so the impact load applied to the entire frame is canceled out, and the entire frame is As a result, the reciprocating speed of the cutting blade 7 can be increased without causing large vibrations. Furthermore, as shown by the chain line in FIG. 4, there are bellows 3 on both sides of the piston 28 that seal the gas
4 and utilizes the pressure accumulating function of the bellows 34, the above-mentioned effect is further enhanced.

35 is a star wheel provided in the grain culm transfer path above the cutting blade device 2, and is for guiding the cut grain culm rearward.

The present invention is constructed in this way, and the rotation of the crankshaft 24 is controlled by the crank pin 24a and the metal 25.
The rod 21 reciprocates in the front-back direction by power transmission through the bell crank 13, and the bell crank 13 rotates. Then, since the drive pin 17 at the tip of the drive arm 15 slides in the long groove 11a of the knife head 11 and moves the knife head 11 left and right, the cutting blade 7 is guided by the knife bar 8 guided by the horizontal groove between the stationary receiving blade 6 and the guide 9. It is driven both left and right. Therefore, grain culms are harvested between the stationary receiving blade 6 and the cutting blade 7 as the machine moves forward.

At this time, the knife bar 8 to which the cutting blade 7 is connected is long in the lateral direction, so it is affected by the couple, but the distance L from the intersection P of the knife head 11 and the drive pin 17 to the cutting blade attachment part Q of the knife head 11 is possible. Since the knife bar 8 is relatively short, the magnitude of the force couple is relatively small, and therefore the sliding resistance is also small, and the cutting blade 7 can smoothly reciprocate from side to side without the knife bar 8 being worn or deformed. be exposed.

And the harvested grain culm is star wheel 35
The grains are transported rearward through a wide grain transport passage above the cutting blade device 2 while being guided by the grains.

Further, the tip of the drive arm 15 and the lower end of the drive pin 17, that is, the nut 17a are disposed here by utilizing the space behind the fixed receiving blade 5 having a thrust angle α, so that there is no gap between them and the ground. Because it is leaning against the ground, this part operates smoothly without touching the ground or pressing down on the stump.

(Effect of the invention) In the present invention, the drive pin of the drive arm is fitted from below into the long groove provided in the knife head, so that there is no problem in forming the grain culm transfer device above the cutting blade device. However, the drive arm can be placed conveniently by utilizing the space formed at the rear of the cutting blade device having a plunge angle, so that it is largely exposed downward and can be operated by touching the ground or pressing down on a stump. In addition, the distance between the drive pin and the fixing point of the knife head can be shortened by having the drive arm and the cutting blade device close to each other, and by intersecting the drive pin at an acute angle tilted forward with respect to the knife head. Therefore, the magnitude of the couple applied to the knife bar that connects the cutting blades can be reduced, reducing wear and deformation of the sliding parts, improving cutting performance, and making the entire cutting blade drive device compact. It has now become possible to do so.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a plan view of the cutting blade drive device, Fig. 2 is a side view of the main part thereof, Fig. 3 is a sectional view of the drive pin part, FIG. 4 is a sectional view of the hydraulic balancer. 2...Mower blade device, 6...Fixed receiving blade, α...Plunge angle, 7
...Cutter blade, 11...Knife head, 11a...Long groove, 1
5... Drive arm, 17... Drive pin, β... Acute angle, 3
5...Star wheel.

Claims (1)

[Scope of utility model registration request] In a cutting blade device mounted on a frame with a rake conveyance device close to the top and having a plunge angle to the ground, the cutting blade slides from side to side above a fixed receiving blade of the cutting blade device. The drive pin of the drive arm, which is pivotally supported on the frame, is inserted from below into the long groove in the longitudinal direction of the knife head, which has its base attached to the cutting blade and extends rearward, and the angle between the drive pin and the knife head is adjusted. A cutting blade drive device for a reaper in which a drive arm and a cutting blade device are brought close to each other by intersecting each other at an acute angle tilted forward, and the cutting blade is reciprocated by rotation of the drive arm.