JPS6011767Y2 - Knife section in a reaper - Google Patents

Description

[Detailed explanation of the invention] This invention has a high yield rate with less distortion and cracking during heat treatment during production, and has high durability with less chance of blade spillage due to stones during use. All of these propose a knife section with no loss of sharpness compared to saw blades.

In order to maintain the sharpness of the culm over a long period of time, the blade edges 2 and 2 are serrated from the top or bottom, and the blade edges 2 and 2 are serrated.

In conventional knife sections, this is done to the point of sharpness.

Therefore, when cold forging is used to sharpen the serrations, cracks occur and the yield is poor, and when quenching the saw teeth, there are many changes in the tooth area and thickness, even down to the thinner tip, resulting in quenching cracks. This causes distortion and increases the defective rate.
Overall, the prices of quality products tended to be relatively high.

When the knife section is attached to a reaper and used, the narrow cross-sectional area of the tip that hits the stone most often forms waves in the front-back direction, which can cause cracks.
Sometimes the blade would spill.

This invention eliminates these defects and maintains the same sharpness as conventional saw blades.This will be explained based on the embodiments shown in the drawings. 1 is a knife section;
The left and right blade edges 2, whose extension lines diagonally intersect with the center line opening perpendicular to the reciprocating direction A and approach as they reach the tip;
2, and a parallel edge 3 parallel to the reciprocating direction A at the tip.

The blade edges 2, 2 have a trapezoidal cross section with the upper surface shaved off obliquely, and the tip has a shape of 5wIL to 15mm.
77E+l+, straight blades 2a, 2a made of only the above-mentioned obliquely shaved shape are formed, and from this to the rear end, there are irregularities on the outer edge of a certain width on the top surface (slope portion) or the bottom surface, or on the entire surface. Hitachi is applied to form the saw blades 2b, 2b.

Further, the parallel edge 3 has a total length of about 5 mm to 157 ra, and the end face is formed into a triangle or trapezoid when viewed from the front.

Furthermore, this knife section 1 is made of a single material or a composite material and is hardened.

The knife section 1 has rivets inserted into its holes 4, and a large number of them are lined up side by side and fixed to a knife bar, and are operated in a reciprocating direction on the receiving blade to cut shell culms and other objects. .

Here, according to this invention, the knife section 1 has a parallel edge 3 parallel to the reciprocating direction A over a predetermined length at the tip, and when viewed from the front, the end face has a perpendicular triangular shape. It is trapezoidal, and the blade edges 2, 2 in the vicinity of the parallel edge 3 are straight blades 2at2a without saw blades, so there is no thin part at the tip, and Hitachi has applied the edge near the tip. Therefore, even if the serrations are cold forged, the rate of cracking is significantly lower than that of conventional products with sharp tips and Hitachi applied to the tips.

Also, even when this is hardened, there is less sudden change in the cross-sectional area compared to the conventional one where Hitachi is applied to the entire surface.
The occurrence of distortion due to quench cracking was significantly reduced, and the combination of these two significantly improved the yield rate of the product.

Therefore, the knife section 1 can be provided to consumers at low cost.

Furthermore, according to this invention, the tip, which is most likely to be hit by stones during use, is composed of straight blades 2a, 2a, compared to conventional blades in which all blade edges 2, 2 are formed of saw blades. The blade is less prone to chipping and has improved durability, making it durable for long-term use.

Furthermore, the main parts of the blade edges 2, 2 for cutting the culm and other parts are as follows:
Since it is formed on the saw blades 2b, 2b, there was no loss of sharpness compared to the conventional one.

[Brief explanation of drawings]

Fig. 1 is a plan view of the knife section of the reaper of this invention, Fig. 2 is a side view thereof, Fig. 3 is an enlarged plan view of a portion thereof, and Fig. 4 is a front view cut along line A-A. figure,
FIG. 5 is a front view cut along line BB. The symbols in the figure are as follows. 1...Knife section, 2...Blade edge, 2a...Straight blade, 2b...Saw blade, 3
...Parallel edges, 4...holes, i...
・Direction of reciprocating movement, mouth... Center line.

Claims (1)

[Scope of utility model registration request] The blade has left and right blade edges 2.2 which are oblique to the center line opening perpendicular to the reciprocating direction A and approach each other as they reach the tip, and a parallel edge 3 which is parallel to the reciprocating direction A at the tip. Edge 2
, 2 has straight blades 2a, 2a on the distal end side and saw blades 2b, 2b on the proximal side thereof, and the parallel edge 3 is characterized in that the end face is formed in a trapezoidal or triangular shape when viewed from the front. knife section in the reaper.