JPH0730291Y2 - Mowing part structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to the structure of a reaper such as a harvester.

<Prior art> The structure of the harvesting device installed in combine harvesters and legume harvesters is such that the saw-shaped upper and lower blades are overlapped and one or both of the upper and lower blades are driven in opposite directions. Then, the stem of the harvested product is cut. The upper and lower blades are formed by connecting a plurality of mountain-shaped cutting blades, and the blades provided on both slopes of the cutting blade cut the harvested object.

On the other hand, when the stem of the harvested product is hard or thick,
Even if the mowing device is driven, the blade is slid out and pushed forward, resulting in poor cutting efficiency. For this reason, in the past, a blade of a cutting blade having a fine serration is used to prevent slipping of the stem and improve cutting efficiency.

<Problems to be solved by the invention> However, if the saw blade is formed on the blade portion of the cutting blade as in the conventional case,
As shown in FIG. 9, the crests 73a of the saw blade 73 of the upper blade side cutting blade 73
Then, there is a problem that the driving blade does not drive smoothly because the serrated ridges 74a of the lower blade side cutting blade 74 collide during cutting driving. In addition, there is a defect that the blade spills due to the collision of the ridges of the sawtooth, and the sharpness of the reaper is deteriorated,
The cutting blade had to be changed frequently.

<Means for Solving the Problems> The present invention for solving the above problems is to fix a plurality of cutting blades 20 formed in a chevron shape linearly to obtain upper blades 17, 34 and lower blades 19, 35, and the upper blade 17,34 with the cutting blade 20 slidingly contacting
And the lower blades 19 and 35 are overlapped with each other, and the blade portion 53 of the cutting blade 20 is formed with sawtooth lines 56 including a plurality of peaks 54 and valleys 55, and the upper blades 17 and 34
In the structure in which the lower blades and the lower blades 19 and 35 reciprocate relatively in opposite directions, the saw blades of the upper blades 17 and 34 and the saw blades 56 of the lower blades 19 and 35 are displaced by about a half pitch and face each other. I am trying.

<Action> The upper blades 17 and 34 and the lower blades 19 and 35 constituted by the cutting blade 20 reciprocate relatively in opposite directions, and are harvested at the points where the blade portions 53 of the upper and lower cutting blades 20 intersect. Mow things.

Here, in the serrations 56 formed on the blade portion 53, the upper blade 1
The shape of the saw stitches 56 on the 7,34 side and the shape of the saw stitches 56 on the lower blades 19,35 are displaced by about a half pitch. Therefore, the upper and lower blades 17,34,19,35
Alternatively, when one of the upper blades 17 and 34 or the lower blades 19 and 35 is driven to perform a mowing operation, the serrations 56 of the cutting blades 20 which are in sliding contact with each other are formed by the crests 54.
The ridges of the other cutting blade 20 that are in sliding contact with each other without direct contact.
It does not come up with the slope of 54 and reaches the sliding contact surface, and no spilling of the blade occurs.

<Embodiment> An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 is a side view of a pretreatment section of a combine in which the apparatus of the present invention is implemented. The portion 3 is provided so as to be vertically swingable, and a plurality of dividers 7 are attached to the pretreatment frame 5 at the lower end of the front surface of the pretreatment portion 3, and a plurality of dividers 7 are raised from the rear of the divider 7. Case 9
Is obliquely installed.

Behind the lower end of the raising case 9, a reaping device 11 is attached to the pretreatment frame 5 and provided in the left-right direction.

As shown in FIGS. 1 and 3, the reaping device 11 is fixedly attached to the lower ends of the collars 13 projecting downward from the plurality of pretreatment frames 5. Ie reaper
Reference numeral 11 includes a cutting section 44 placed on the receiving table 15 and a driving section 46 for driving the cutting section 44. The blade holder 15 is fastened to the lower end of the collar 13, and the upper blade 17 and the lower blade are mounted on the blade holder 15.
19 and the cutting part which is piled up and down are placed, and the upper blade 17 and the lower blade 19
Are held so that they can be moved sideways. In the structure of the present embodiment, the upper blade 17 and the lower blade 19 reciprocate, so that both serve as drive blades.

The upper blade 17 and the lower blade 19 are integrally fixed to the lower surface or the upper surface of one of the upper and lower knife backs 21 and 23 by flat head bolts or rivets so that a large number of cutting blades 20 are lined up in a straight line. Both have substantially the same shape and configuration, and the two blades 17 and 19 are overlapped with the sliding surfaces on the cutting blade side facing each other to form a blade holder 15.
Placed on top.

On the upper surface of the front end of the blade holder 15, a lower blade guide portion 25 formed of a straight rod-shaped member formed thicker than the lower knife back 23.
However, it is fixed over the entire length by means of countersunk bolts, and the lower surface of the lower blade 19 is in sliding contact with the upper surface thereof.

As shown in FIG. 4, clips 27, which are curved in a U shape at predetermined intervals, are fixed to the receiving base 15 in the front-rear direction by bolts or the like. An upper blade guide portion 29 is fixed to the upper inner front end portion of the clip 27, an upper blade 17 upper surface is slidably contacted with a lower surface thereof, and the lower blade guide portion 25 slidably holds the upper and lower blades 17 and 19. There is.

Further, as shown in FIG. 1, guide rollers 31 are pivotally supported on both sides of the clip 27 by support pins 33 projectingly provided on the receiving blade 15. The guide roller 31 pivotally supported by the support pin 33 is
The upper guide roller 31a rolls on the rear surface of the knife back 21 of the upper blade 17, and the lower guide roller 31b rolls on the rear surface of the knife back 23 of the lower blade. Touching. With this guide roller 31, the lower blade guide portion 25 and the upper blade guide portion 29, the upper blade 17 and the lower blade 19
The movement in the front-back direction is restricted, and the slide movement is possible in the left-right direction.

When the upper blade 17 and the lower blade 19 reciprocate, the guide roller 31
Each of a and 31b separately rolls on the upper blade 17 and the lower blade 19 to smoothly guide the movement of the driving blade. Further, since there is no frictional contact, wear on the side of the upper blade 17 and the lower blade 19 which are drive blades is eliminated, and rattling between the guide roller 31 and the drive blade is reduced.

FIG. 5 shows the structure of the embodiment in which the lower blade 35 is fixed. In this case, the cutting part 45 is the fixed lower blade 35.
And a reciprocating upper blade 34, and the front end of the clip 47 is curved downward to form an upper blade guide portion 36. Then, one guide roller 48 is provided, and the knife back of the upper blade 34 is provided.
Transferred to 50. Here, the lower blade 35 is fixed, but when viewed from the driving upper blade 34 side, the lower blade 35 relatively reciprocates in the opposite direction.

As shown in FIG. 1, front ends of plate-shaped knife heads 37, 39 are fixed to the upper blade 17 and the lower blade 19 via knife backs 21, 23. Here, the receiving table 15 is provided with a space 15a for attaching the knife head 39 from the lower side to the lower blade 19, and the size thereof is sufficient to allow the lateral movement of the knife head 39. .

At the rear end of each knife head 37, 39, a crank 4
Knife side accommodating portions 37b and 39b formed by U-shaped notches for connecting the knife side engaging portions 40 and 42 of 9,51 are formed, respectively.

Hereinafter, the driving unit that drives the cutting unit will be briefly described. The drive part is composed of two interlocking cranks 49, 51. The knife-side engaging portions 40, 42 which engage with the knife-side accommodating portions 37b, 39b, respectively, are provided at the knife-side tips of the cranks 49, 51 rotatably supported on the pretreatment portion side. In such a structure, the engaging portions 40 and 42 are connected to the crank 4
Moves left and right in an arc with the swing of 9,51, and each knife head
Left and right drive 37 and 39.

As shown in FIG. 1, the shapes of the cranks 49, 51 are the shaft support 49.
It is a bell crank that bends left and right at a and 51a, and each shaft support 4
The cranks 49, 51 are formed to overlap each other at an intermediate point between 9a, 51a. An engaging portion 64 is provided on the crank 51 side end of one crank 49, similar to the knife side engaging portion 40.
It is located at the midpoint of 3,55.

At the tip of the other crank 51 on the crank 49 side, the engaging portion is
An accommodating portion 61 for slidably accommodating and accommodating 64 is provided as a rectangular hole whose left and right sides are the longitudinal direction. Crank 49
When the crank swings, the crank 51 moves through the engaging portion 64 and the accommodating portion 61.
Also has a mechanism that swings.

Then, as shown in FIG. 1, the outer end of the crank 49 is connected to the link 67, and the crank 49 is forcibly swung by the drive of the cutting blade shaft to which the link 67 is connected.

By the operation of the drive unit 46 as described above, the upper blade 17 and the lower blade 17
19 reciprocates in opposite directions.

As shown in FIGS. 6 and 7, the cutting blade 20 has a blade portion on the left and right hypotenuses.
The blade portion 53 has a saw-tooth pattern 56 formed by forming a plurality of peaks 54 and valleys 55. The serrations 56a of the cutting blade 20a attached to the upper blade 17 and the serrations 56b of the cutting blade 20b attached to the lower blade 19 have the same pitches of the mountain portions 54, but the mountain portions 54 Are formed by mutually displacing the forming positions of the respective parts by approximately a half pitch.

Therefore, when the upper blade 17 and the lower blade 19 are driven to overlap each other,
Upper blade 17 side cutting blade 20a crest 54a and lower blade 19 side cutting blade 20b crest 54b
The two vertices do not collide with each other and a blade spill does not occur,
The mountain portion of one cutting blade 20a is guided by the hypotenuse of the mountain portion 54b of the other cutting blade 20b and reaches the valley portion 55b. Therefore, the upper and lower cutting blades 20
The upper and lower blades 17 and 19 are driven smoothly without the saw stitches 56a and 56b of the a and 20b interfering with each other.

Furthermore, the cutting blade 20a on the side of the upper blade 17 and the cutting blade 20b on the side of the lower blade 19 have the same serrations 56 without displacing the pitch, and the upper blade 17
The same effect can be obtained by displacing either one of the support positions of the lower blade 19 and the lower blade 19 by a half pitch. In this case, since the cutting blades 20 forming the upper and lower blades 17 and 19 can be the same, manufacturing is easy and cost can be reduced.

Further, in addition to the structure of the embodiment described above, also in the mowing device in which the upper blade or the lower blade is fixed, it is possible to obtain the same effect by displacing the pitch of the saw blades of the upper and lower cutting blades by a half pitch. Become.

<Effect of the Invention> According to the structure of the present invention configured as described above, since the saw blades of the blade portions of the upper blade and the lower blade are displaced by about a half pitch, the mountain portion and the mountain portion are moved during the cutting drive. It is possible to eliminate the disadvantage that the blades come into contact with each other to cause blade spillage, and the upper blade and the lower blade can be smoothly driven without being caught.

Further, as a result of less blade spillage, the cutting edge of the cutting blade becomes less blunt, and the life of the cutting blade is extended.

[Brief description of drawings]

FIG. 1 is a plan view of the mowing device, FIG. 2 is a side view of the combiner's pretreatment unit, FIG. 3 is a side view showing the mounting condition of the mowing device, and FIG. 4 is a mowing device showing the supporting condition of the cutting unit. Side sectional view, FIG. 5 is a side sectional view showing another embodiment, FIG. 6 is a plan view of a cutting blade, FIG. 7 is a side view of the same cutting blade, and FIG. 8 is a saw showing a sawtooth shape. FIG. 9 is an enlarged view of the eye, and FIG. 9 is an enlarged view of the saw eye showing the positional relationship of the conventional saw eye. 17,34: Upper blade, 19,35: Lower blade 20: Cutting blade, 54: Mountain portion 55: Valley portion, 56: Serrated

Claims (1)

[Scope of utility model registration request] 1. A plurality of cutting blades (20) formed in a mountain shape are fixed linearly to upper blades (17), (34) and lower blades (19), (35).
And the cutting blade (20) is in sliding contact with the upper blade (17),
(34) and lower blades (19), (35) are overlaid, cutting blade (20)
The blade portion (53) has a serration (56) consisting of a plurality of peaks (54) and valleys (55), and upper blades (17), (34) and lower blades (19), ( In the structure in which 35) relatively reciprocates in the opposite direction, the saw blades of the upper blades (17) and (34) and the saw blades (56) of the lower blades (19) and (35) are displaced by about half a pitch and face each other. Mowing unit structure.