JPH09121641A - Reaping blade device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reaping blade device, capable of pressing one movable reaping blade to the other blade with a pushing force, etc., produced by a slope, preventing the movable blade from floating due to an offset load and reducing the production of noise, improved in cutting performances and useful for a combine harvester, etc. SOLUTION: This reaping blade device is obtained by installing at least either of reaping blades as a movable reaping blade 9 capable of freely sliding along the other reaping blade in a pair of the reaping blades 8 and 9 superposing in the upper and lower sides, fitting a connecting roller 16 of a bell-crank 14 capable of performing reciprocating and shaking motion into a connecting hole (13a) of a knife head 13 provided in the movable reaping blade 9, making the movable reaping blade 9 perform reciprocating sliding motion, forming a slope (16a) for producing a pushing up force or a pushing down force of the knife head 13 in a contact surface part of the connecting roller 16 with the connecting hole (13a) and pressing the movable reaping blade 9 to the other reaping blade 8 by the pushing up force or pushing down force produced by the slope (16a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a cutting blade device provided on a combine, a binder and the like.

[0002]

Generally, a cutting blade device provided in a combine or the like of this type is capable of sliding at least one cutting blade of a pair of vertically overlapping cutting blades along the other cutting blade. The movable cutting blade is a movable cutting blade, and a connecting roller of a bell crank that reciprocally swings is fitted into a connecting hole of a knife head provided in the movable cutting blade so that the movable cutting blade reciprocally slides. However, since an unbalanced load other than the sliding direction also acts on the movable cutting blades during driving, there is a possibility that a gap will be created between the cutting blades and cutting failure may occur. There was an inconvenience of generating noise.

[0003]

SUMMARY OF THE INVENTION The present invention has been made with the object of providing a cutting blade device capable of solving these problems in view of the above circumstances,
Among the pair of cutting blades that are vertically stacked, at least one cutting blade is a movable cutting blade that is slidable along the other cutting blade,
In a cutting blade device for reciprocally slidingly moving a movable cutting blade by fitting a connecting roller of a bell crank that reciprocally swings into a connecting hole of a knife head provided in the movable cutting blade, the connecting roller and the connecting hole are connected to each other. Forming an inclined surface for generating a pushing-up force or a pushing-down force of the knife head on the abutting surface portion, and pushing the movable cutting blade against the other cutting blade by the pushing-up force or the pushing-down force generated by the inclined surface Is. That is,
Since the movable cutting blade is pressed against the other cutting blade by using the driving force of the bell crank, it is possible to prevent the movable cutting blade from floating due to an unbalanced load and improve the cutting performance. It is also possible to reduce noise generation due to the impact.

[0004]

Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, 1 is a combine, and the combine 1 comprises a pretreatment unit 2 for cutting stalks, a threshing unit (not shown) for threshing treatment of cut stalks and selection of threshing grains, The post-processing unit 4 for discharging the culms and the crawler-type running unit 5 are provided, but the basic configurations of these units are the same as in the related art.

Reference numeral 6 denotes a single-action reciprocating type cutting blade device disposed at the bottom of the pretreatment unit 2. The cutting blade device 6 is composed of a pair of cutting blades (knife connection body) that vertically overlap each other. Of these, the lower cutting blade is a fixed cutting blade 8 fixed to the front end of the cutting blade receiving stand 7.
On the other hand, the upper cutting blade is a movable cutting blade 9 that is relatively slidable with respect to the fixed cutting blade 8, and the stalk is cut between the two cutting blades 8 and 9 based on the reciprocating sliding motion of the movable cutting blade 9. It is designed to reap culms. That is, a slide bar (knife connecting bar) 1 integrally provided on the bottom of the movable cutting blade 9
0 is slidably supported by the guide groove G formed between the fixed cutting blade 8 and the guide plate 11, and the cutting of the movable cutting blade 9 is restricted by the cutting blade presser 12. The knife head 13 that integrally projects rearward from the connector 9 has a long hole-shaped connecting hole 13a facing the front-rear direction.
Are formed.

Reference numeral 14 denotes a bell crank disposed behind the movable cutting blade 9, and the bell crank 14 can swing left and right with a support shaft 15 located near the rear of the knife head 13 as a fulcrum. However, a connecting roller 16 that fits into the connecting hole 13a is provided at the front portion of the fulcrum, while a drive rod 18 that reciprocates back and forth as the cutting blade drive shaft 17 is driven is connected at the lateral position of the fulcrum. Has been done. That is,
With the reciprocating movement of the drive rod 18 back and forth, the bell crank 1
When 4 reciprocally rocks, the connecting roller 16 located in front of the rocking fulcrum moves in a circular arc in the left-right direction, so that the movable cutting blade 9 reciprocally slides in conjunction with this.

The connecting roller 16 has a connecting hole 13.
Although the movable cutting blade 9 is forcibly slid by abutting against the left and right inner side surfaces of a, the outer peripheral surface of the connecting roller 16 and the left and right inner side surfaces of the connecting hole 13a which contact each other are inclined downwardly. It is formed on the surfaces 16a and 13b. That is, when pressing the left and right inner side surfaces of the connecting hole 13a with a predetermined driving force P, not only the force Px that presses the knife head 13 in the left and right direction but also the force Py that pushes up the knife head 13 is pushed.
Are generated at the same time. Therefore, on the rear end side of the movable cutting blade 9, an upward moment M with the cutting blade pressing position (the point of action of the cutting blade pressing 12) as a fulcrum is generated, while on the front end side of the movable cutting blade 9, A downward force F acts as a reaction force of the moment M, and the movable cutting blade 9 is pressed against the fixed cutting blade 8 based on this force F.

Reference numeral 19 denotes a rear bumper of the combine 1. The rear bumper 19 is attached to the machine body frame 20 via a bumper stay 21, and there is a predetermined interval in the interior space of the bumper open to the front. A pair of left and right plates 22 is provided, and further, a substantially U-shaped jack receiver 22a capable of receiving and supporting both upper and lower ends of the jack 23 is integrally provided on the opposing surface portions of both plates 22. . That is, the left and right jack receivers 22
After the jack 23 is placed between a and the jack 23, the jack 23 can be stored in the rear bumper 19 without rattling by extending the jack 23.

On the other hand, 24 is a lift frame that supports the pretreatment unit 2 so as to be able to move up and down.
4 is composed of a pair of left and right vertical frames 25 standing upright on the machine body frame 20 with a predetermined space therebetween, and a horizontal frame 26 horizontally installed at the upper end of the vertical frame 25. , A substantially U-shaped jack receiver 25 capable of receiving and supporting the jack 23 on the opposing surface portions of the left and right vertical frames 25.
Since a is integrally provided, the jack 23 can be stored in the lift frame 24. That is, since the storage space for the jacks 23 is secured in the front and rear of the machine body and the storage space can be appropriately selected, the jack 23, which is a heavy object, also functions as a balance weight for adjusting the front and rear balance of the machine body. It can be done.

In the structure as described above, the connecting roller 16 provided in the bell crank 4 presses the left and right inner side surfaces of the connecting hole 13a formed in the knife head 13 to forcibly move the movable cutting blade 9. However, since the outer peripheral surface of the coupling roller 16 and the left and right inner side surfaces of the coupling hole 13a are formed as the downwardly sloping inclined surfaces 16a and 13b, the left and right inner side surfaces of the coupling hole 13a are predetermined. When the driving force P is applied, the force Px that pushes the knife head 13 in the left-right direction as well as the force Py that pushes up the knife head 13 are simultaneously generated. Therefore,
On the rear end side of the movable cutting blade 9, an upward moment M with the cutting blade pressing position as a fulcrum is generated, while on the tip side of the movable cutting blade 9, a downward force F acts as a reaction force of the moment M. However, the movable cutting blade 9 is pressed against the fixed cutting blade 8 based on this force F. As a result, it is possible to prevent the movable cutting blade 9 from floating due to an unbalanced load and improve the cutting performance. It is also possible to reduce the generation of noise due to the contact between the cutting blades 8 and 9.

Moreover, in this embodiment, the connecting roller 16
Since the distance from the pressing position of the cutting blade to the cutting blade pressing position is set larger than the distance from the cutting blade pressing position to the tip position of the movable cutting blade 9, the pushing force Py is set based on the action of a so-called lever. There is an advantage that the necessary pressing force F can be secured only by generating a slight pushing force Py as a result.

Of course, the present invention is not limited to the above-mentioned embodiment. For example, the upper and lower cutting blades are movable cutting blades, and both movable cutting blades are slid in the anti-reverse direction to perform mowing. It can also be implemented in a double-acting reciprocating blade device.

[Brief description of the drawings]

FIG. 1 is a side view of a combine.

FIG. 2 is a plan view of a cutting blade device.

FIG. 3 is a sectional view of the same.

FIG. 4 is a cross-sectional view of a main part of the same, showing an operation.

FIG. 5 is a perspective view of a rear bumper.

FIG. 6 is an exploded perspective view of a rear bumper.

FIG. 7 is a perspective view of a pretreatment lift frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 combine 8 fixed cutting blade 9 movable cutting blade 13 knife head 13a connecting hole 13b inclined surface 14 bell crank 16 connecting roller 16a inclined surface

Claims (1)

[Claims] 1. A pair of cutting blades that vertically overlap each other, at least one cutting blade being a movable cutting blade that is slidable along the other cutting blade, and a connecting hole of a knife head provided in the movable cutting blade. In a cutting blade device that fits a connecting roller of a bell crank that reciprocally swings to reciprocally slide a movable cutting blade, in a contact surface portion between the connecting roller and the connecting hole,
A cutting blade device which forms an inclined surface for generating a pushing-up force or a pushing-down force of a knife head and presses a movable cutting blade against the other cutting blade by the pushing-up force or the pushing-down force generated by the inclined surface.