JP2526477Y2 - Knife head support structure for cutting blade mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a cutting blade mechanism, and more particularly, to a support structure of a knife head fixed to a cutting blade.

<Conventional technology> Conventionally, for example, in a harvesting device such as a combine,
There is a type in which a plurality of cutting blades are fixed to a knife bar, and the cutting blades are vertically overlapped and held, and the upper and lower cutting blades are moved back in opposite directions to cut grain culms and the like.

A knife head for connecting a reciprocating drive mechanism for reciprocating the cutting blade is fixed to each of the upper and lower cutting blades.

<Problem to be Solved by the Invention> However, the conventional knife head extends rearward from the cutting blade, and the weight of the knife head causes the cutting edge side of the cutting blade to float upward. In particular, when the upper cutting blade is securely held, the cutting edge of the lower cutting blade is pressed against the cutting edge of the upper cutting blade, so that there is a disadvantage that the cutting edge of the cutting blade is chipped.

For this reason, there have been disadvantages such as poor mowing performance and slow driving of the cutting blade.

<Means for Solving the Problems> The present invention for solving the problems described above holds an upper cutting blade 11 and a lower cutting blade 13 on a receiving blade base 5 vertically and slidably and horizontally. , Each cutting blade 11, 13 has a knife head 2
A reciprocating drive mechanism 3 for fixing the upper and lower blades 9 and 31 and reciprocating the upper and lower cutting blades 11 and 13 in mutually opposite directions by connecting with the respective knife heads 29 and 31.
In the mechanism provided with 5, a support member 36 for supporting the lower knife head 31 from below is provided.

<Operation> The upper cutting blade 11 and the lower cutting blade 13 are slidably driven in mutually opposite directions on the receiving blade base 5 by the reciprocating drive mechanism 35 to cut grain culm and the like. Upper and lower knife heads 29, 31 are fixed to the upper and lower blades 11, 13, respectively, and the driving force of the reciprocating drive mechanism 35 is applied to the upper and lower blades 11, 13.
Tell

The support member 36 provided below the lower cutting blade 13 contacts the lower knife head 31 from below and supports the lower knife head 31 from below. The upper cutting blade 11 and the lower cutting blade due to the fact that the blade 13 is lifted substantially parallel and only the cutting edge side of the lower cutting blade 13 faces upward.
There is no local contact of the 13 tip sliding contact portions.

<Embodiment> An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 2 is an overall plan view of the cutting blade mechanism 1 attached to the pre-processing unit of the combine. Below the pre-processing frame 3 of the pre-processing section, the receiving blade base 5 is fixed at predetermined intervals by mounting bolts 9 that cover the collar 7.

An upper cutting blade 11 on which a number of mountain-shaped blades 15 are protrudingly provided on the receiving blade base 5.
And the lower cutting blade 13 are superimposed and slidably mounted. The cutting blades 11, 13 are configured by being fixed to bar-shaped knife bars 17, 19. The upper and lower cutting blades 11 and 13 are overlapped with the blade 15 side facing, and a guide 21 attached to the knife bar 19 of the lower cutting blade 13 over the entire width of the front end of the receiving blade base 5 is slidably contacted. Is guided to the left and right.

In addition, holders 23 are provided on the blade holder 5 at predetermined intervals. The holding member 23 having a U-shaped cross section whose front part is open guides the lower cutting blade 13 by sliding its lower end to the rear side of the knife bar 19. A front guide 25 is fixed to the upper end of the holder 23, and the front guide 25 is in sliding contact with the knife bar 17 of the upper cutting blade 11, and is connected to a rear guide 27 provided at a rear facing position. Is slidably held in the left-right direction and guided.

The upper knife head 29 and the lower knife head 31 are separately mounted on the upper and lower blades 11, 13 held as described above. The upper knife head 29 rises upward in the left-right direction from the mounting portion 29a fixed on the knife bar 17, extends parallel to the upper cutting blade 11, and is formed in a U-shape above the upper cutting blade 11. Connection engaging portion 29c is provided.

As described above, since the coupling engagement portion 29c of the upper knife head 29 is positioned above the upper cutting blade 11, the entire upper knife head 29 is located above the upper cutting blade 11, and the center of gravity is also the upper cutting blade 11. 11
Above. Therefore, the weight of the upper knife head 29 is added to the upper cutting blade 11 vertically, so that the upper cutting blade 11 and the lower cutting blade 11 are attached.
It is difficult for a gap to be formed between 13.

The lower knife head 31 is connected to the knife bar 19 below the lower cutting blade 13.
It is fixed to. A notch 33 is formed in the receiving table 5 so that the lower knife head 31 can be attached. The mounting portion 31a of the lower knife head 31 is fixed to the knife bar 19 in the notch 33, and the lower knife head 31 escapes upward from the notch 33 and extends rearward. At the rear end of the lower knife head 31, a connection engaging portion 31c formed in a U-shape is provided.

As shown in FIG. 1, a supporting member that slides on the lower surface of the lower knife head 31 and supports the lower knife head 31 from below. 36
Is attached. Due to the downward load applied to the rear end side of the lower knife head 31, the lower cutting blade 13 is lifted substantially parallel to the upper cutting blade 11 with the support member 36 as a fulcrum, and the sliding contact pressure between the upper cutting blade 11 and the lower cutting blade 13 is increased. And the sharpness is improved, and the wear and spilling of the cutting edge portion due to an increase in the local sliding contact pressure of the cutting edge portion of the blade 15 are reduced.

 Next, the reciprocating drive mechanism 35 will be described.

Above the upper and lower cutting blades 11 and 13 and the receiving table 5 described above,
A swing shaft 37 fixedly supported on the machine side is provided to protrude downward. A bearing is externally fitted to the lower end of the swing shaft 37, and a boss portion provided at the center of the swing drive body 41 is provided.
43 is fitted to the bearing, and the swing shaft 37 rotatably supports the swing driving body 41. Here the swing drive
The swing center 39 of 41 is the center of the swing shaft 37.

A drive link 47 is connected to one end of a drive shaft 45 provided laterally behind the rocking drive 41, and a tip of the drive link 47 is bolted to a link connecting portion 49 of the rocking drive 41. And so on.

The swing driving body 41 has a cross-shaped plate shape, and has a link connecting portion 49 for connecting the driving link 47 at one end bent upward. The drive link 47 reciprocates in the front-rear direction by the drive of the drive shaft 45.
35 reciprocates within a predetermined range.

A balance weight portion 51 is formed on the side opposite to the link connection portion 49 with respect to the swing center 39. Due to the formation of the balance weight portion 51, the weight of the swing driving body 41 about the swing center 39 becomes substantially uniform in the left-right direction, and the swing driving body 41 is shaken or vibrated by the swing drive. Will be resolved.

On the other hand, on the front and rear sides of the swing center 39, connecting portions 53 and 55 are provided, which include roller shafts 57 and 59 protruding downward and rollers 61 and 63 rotatably fitted to lower ends thereof. ing.
The rollers 61 and 63 are engaged in the coupling engagement portions 29c and 31c of the upper and lower knife heads 29 and 31 described above. The rollers 61, 63 are formed with sliding contact surfaces 61a, 63a parallel to the opposing positions, and are in sliding contact with the connection engaging portions 29c, 31c on the plane. Further, the distance from the swing center 39 to each of the roller shafts 57, 59 is equal, so that the strokes of the upper and lower cutting blades 11, 13 are the same. In addition, since the distance from the swing center 39 to each of the roller shafts 57 and 59 becomes equal, the weight balance in the front-rear direction of the swing driving body 41 is also substantially uniform, and vibration and blur during swing driving are reduced. .

The mechanism described above drives the drive link 47,
The swing driving body 41 reciprocates within a predetermined range via the link connecting portion 49. At this time, the connecting portions 53, 55 swing left and right in opposite directions to each other, and the upper and lower knife heads 29, 31 via rollers 61, 63.
Are reciprocally slid in opposite directions.

Since the driving strokes of the upper and lower cutting blades 11 and 13 are equal, the swinging drive of the upper and lower cutting blades 11 and 13 in the opposite direction cancels each other out, so that the cutting blade mechanism 1 does not generate lateral vibration.

Further, in the reciprocating drive mechanism 35, the swing driving body 41 is
Since the cranks for driving the upper and lower cutting blades 11 and 13 are not provided as in the related art, the structure is simple and compact, and the weight is reduced.

Further, the connection engaging portion 29c of the upper knife head 29 is
Since it is provided immediately above and in close proximity, the driving force transmission efficiency from the oscillating driving body 41 is good, and the upper
11 can be moved.

<Effect of the invention> According to the structure of the invention constructed as described above, the lower knife head is supported by the support member, and the weight of the lower knife head is used as the contact pressure to make the sliding contact surface between the lower cutting blade and the upper cutting blade. And the contact pressure on the sliding contact surface is locally increased.

Therefore, there is no blade spilling at the tip of the blade portion of the cutting blade, the contact pressure between the upper and lower cutting blades is high, and there is little biting of straw chips and the like between the upper and lower cutting blades, and more reliable and stable cutting drive is possible. There is an effect that it becomes.

[Brief description of the drawings]

FIG. 1 is a side sectional view of the cutting blade mechanism, and FIG. 2 is an overall plan view of the same. 11: Upper cutting blade, 13: Lower cutting blade 29: Upper knife head, 31: Lower knife head 35: Reciprocating drive mechanism, 36: Support member 39: Swing center, 41: Swing drive 53, 55: Connecting part

Claims (1)

(57) [Scope of request for utility model registration] An upper cutting blade (11) and a lower cutting blade (13) are vertically overlapped on a receiving table (5) and slidably held in the left and right directions. Is the knife head (29),
(31) is fixed, and a reciprocating drive mechanism (35) is provided for connecting the knife heads (29) and (31) to reciprocate the upper and lower cutting blades (1) and (13) in opposite directions. A knife head support structure in a cutting blade mechanism, wherein a support member (36) for supporting a lower knife head (31) from below is provided.