JPH09121642A - Reaping blade device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reaping blade device, capable of regulating the front and rear movement of a movable reaping blade with a pressing force produced by a slope, preventing noise from producing, reducing the abrasion of the movable reaping blade and useful as a combine harvester, a binder, etc. SOLUTION: This reaping blade device is obtained by installing at least either of reaping blades 8 and 9 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 slotlike connecting hole (13a) formed in a knife head part of the movable reaping blade 9 so as to face the front and rear directions onto a driving unit 16 capable of performing circular arc motion in the left and right directions following the reciprocating and shaking motion of a bell-crank 14 and making the movable reaping blade 9 perform reciprocation sliding motion, forming a slope for producing a force pressing the knife head 13 to the front or rear in a contact surface part of the driving unit 16 with the connecting hole (13a) and regulating the front and rear movement of the movable reaping blade 9 by the pressing force produced by the slope.

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. A movable cutting blade, a long hole-like connecting hole formed in the knife head portion of the movable cutting blade in the front-rear direction, and a driving body that makes an arc motion in the left-right direction in accordance with the reciprocating swing motion of the bell crank. The movable cutting blade is adapted to be reciprocally slid in a fitted state. However, since a force in the front-back direction also acts on the movable cutting blade based on the friction between the driving body and the connecting hole, the movable cutting blade is not allowed to move forward and backward to generate noise. There was a possibility of abnormal wear.

[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,
The movable cutting blade is movable by fitting a long hole-like connecting hole formed in the knife head portion in the front-rear direction and a driving body that makes an arc motion in the left-right direction with the reciprocating swing motion of the bell crank. In a cutting blade device for reciprocally sliding a cutting blade, an inclined surface for generating a force for pressing a knife head forward or backward is formed at an abutting surface portion between the driving body and a connecting hole, and the inclined surface is generated. The pressing force regulates the forward and backward movement of the movable cutting blade. In other words, the movable cutting blade is pressed forward or backward using the driving force of the bell crank, so it is possible to prevent the movable cutting blade from moving forward or backward due to friction or the like generated between the driving body and the connecting hole. As a result, it is possible to reduce the generation of noise accompanying the front-back movement of the movable cutting blade, and it is also possible to prevent abnormal wear of the movable cutting blade.

[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 a guide groove M 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 driving body 16 that fits into the connecting hole 13a is rotatably provided in the front portion of the fulcrum, while in the lateral position of the fulcrum, it is moved forward and backward as the cutting blade drive shaft (not shown) is driven. A reciprocating drive rod 18 is connected. That is, when the bell crank 14 reciprocally swings in accordance with the back-and-forth reciprocating movement of the drive rod 18, the driving body 16 located in front of the swing fulcrum makes a circular motion in the left-right direction. Is capable of reciprocating sliding motion.

By the way, since the driving body 16 which moves in an arc in the left-right direction pushes the knife head 13 left and right while moving in the connecting hole 13a in the vertical direction, there is a gap between the driving body 16 and the knife head 13. It is known that the frictional force f in the vertical direction is generated in accordance with the circular motion of the driving body 16, and as a result, the movable cutting blade 9 moves in a figure 8 shape in plan view in the conventional one. However, in the present embodiment, the left and right outer side surfaces of the driving body 16 and the left and right inner side surfaces of the coupling hole 13a that generate the frictional force f are formed into the rearwardly widened inclined surfaces 16a, 1a.
By forming the movable cutting blade 3b, the forward and backward movement of the movable cutting blade 9 is reduced. That is, in pressing the left and right inner side surfaces of the connecting hole 13a with a predetermined driving force, not only the force P for pressing the knife head 13 in the left and right direction but also the force F for pressing the knife head 13 forward based on the tilt guide action. Therefore, when the driving body 16 moves from the intermediate point to the left and right, the rearward movement of the movable cutting blade 9 is restricted by absorbing the backward frictional force f (or positively pressing forward). On the other hand, when the driving body 16 returns from the left and right position to the intermediate point, the pressing force F is added to the forward frictional force f to positively press the movable cutting blade 9 forward,
As a result, the movable cutting blade 9 is always subjected to a forward force and its forward and backward movement is restricted.

In the structure configured as described above, the driving body 16 provided on the bell crank 4 is the knife head 1
The movable cutting blade 9 is forcibly slid by being pressed against the left and right inner side surfaces of the connecting hole 13a formed in 3. Since it is formed on the inclined surfaces 16a and 13b which are spread backward, not only the force P for pressing the knife head 13 in the left and right direction but also the force F for pressing the knife head 13 forward.
Will occur at the same time. That is, when the driving body 16 moves from the intermediate point to the left and right, the inclined surfaces 16a, 1
The rearward movement of the movable cutting blade 9 is regulated by absorbing the backward frictional force f generated between 3b, while the pressing force F is applied to the forward direction when the driving body 16 returns from the left and right position to the intermediate point. The movable cutting blade 9 is positively pressed forward by adding to the frictional force f. Therefore, it is possible to prevent the movable cutting blade 9 from moving back and forth due to friction or the like generated between the driving body 16 and the knife head 13, and as a result, it is possible to reduce the generation of noise accompanying the forward and backward movement of the movable cutting blade 9. Although it is possible, it is possible to prevent abnormal wear of the movable cutting blade 9, the slide bar 10 and the like.

It should be noted that the present invention is not limited to the above-described embodiment, and 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 cutting. 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 sectional view of a cutting blade device.

FIG. 3 is a plan view of a main part of the above.

FIG. 4 is an enlarged plan view of an essential part of the same, showing the operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combine 8 Fixed cutting blade 9 Movable cutting blade 13 Knife head 13a Connection hole 13b Sloping surface 14 Bell crank 16 Driver 16a Sloping 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 the front and rear direction is directed to a knife head portion of the movable cutting blade. In the cutting blade device, the movable cutting blade reciprocally slides by fitting a long hole-shaped connection hole formed by the driving member and a driving body that circularly moves in the left-right direction along with the reciprocating rocking motion of the bell crank. A cutting surface is formed at the contact surface between the driving body and the connecting hole to generate a force for pressing the knife head forward or backward, and the pressing force generated by the inclined surface regulates the forward and backward movement of the movable cutting blade. Blade device.