JP2539011Y2 - Knife head structure in 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 structure of a knife head of the cutting blade mechanism.

<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 held vertically one above the other, and the upper and lower cutting blades are moved back in opposite directions to cut shell 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, since the conventional knife head extends backward from the cutting blade, the weight of the knife head causes the cutting edge side of the cutting blade to rise upward. As a result, the upper cutter blade partially held by the clip has a larger lifting amount than the lower cutter blade whose lower surface is slidably held over substantially the entire length by the receiving blade base. As shown, there is a problem that a gap 1 is generated between the upper and lower cutting blades.

For this reason, the cutting performance is deteriorated, and during the cutting operation, straws and sand particles are caught between the upper and lower cutting blades, and the driving of the cutting blades is slowed down.

An object of the present invention is to solve the above-mentioned problem by changing the structure of a knife head.

<Means for Solving the Problems> The present invention for solving the above-mentioned problems is based on the upper cutting blade.
11 and the lower cutting blade 13 are vertically overlapped and held slidably to the left and right. Knife heads 29 and 31 are fixed to the respective cutting blades 11 and 13 and connected to the respective knife heads 29 and 31 to cut the upper and lower cutting blades. In a mechanism provided with a reciprocating drive mechanism 35 for reciprocating the blades 11 and 13 in opposite directions, the center of gravity of the upper knife head 29 is positioned directly above the upper cutting blade 11 and the lower knife fixed to the lower cutting blade 13. The knife head 31 is characterized in that it extends rearward of the upper knife head 31 so that the front of the lower knife head 31 can be lifted.

<Operation> The upper cutting blade 11 and the lower cutting blade 13 are slidably driven in opposite directions by a reciprocating drive mechanism 35, and the blades 15 provided on the upper and lower cutting blades 11, 13 are moved.
Then, the culm and the like are cut. Upper and lower knife blades 29, 31 are fixed to the upper and lower blades 11, 13, respectively, and transmit the driving force of the reciprocating drive mechanism 35 to the upper and lower blades 11, 13.

Here, since the center of gravity of the upper knife head 29 is located above the upper cutting blade 11, the weight of the upper knife head 29 is
From above, the upper cutting blade 11 is pressed against the lower cutting blade 13. For this reason, a reliable cutting operation can be performed without generating a gap between the upper blade 11 and the lower blade 13.

<Embodiment> An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 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 having a large number of angled blades 15 formed 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. 2, a supporting member for slidingly contacting the lower surface of the lower knife head 31 and supporting the lower knife head 31 from below is provided on the rear end side of the receiving table 5 below the lower knife head 31. 36
Is attached. Due to the weight of the lower knife head 31, the lower cutting blade 13 is lifted substantially in parallel with 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 increases substantially evenly, And the wear and spilling of the cutting edge due to an increase in the local sliding contact pressure of the cutting edge 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 provided at the center of the swing drive body 41.
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, by equalizing the distance from the swing center 39 to each of the roller drives 57 and 59, the weight balance of the swing drive body 41 in the front-rear direction is also substantially uniform,
Vibration and blur during swing drive 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 drive strokes of the upper and lower cutting blades 11 and 13 are equal, the sliding drive of the upper and lower cutting blades 11 and 13 in the opposite direction cancels each other out, and 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 configured as described above, the center of gravity of the upper knife head is located above the upper cutting blade and the front of the lower knife head is lifted. The upper blade is pressed against the lower blade by the lifting force of the knife head.

Therefore, there is no gap between the upper blade and the lower blade due to the weight of the back balance of the upper knife head as before, and the upper blade and the lower blade adhere to each other with the weight of the upper knife head, and demonstrate a reliable cutting function There is an effect that can be done.

Since the upper knife head is above the upper cutting blade, the connecting portion with the reciprocating drive mechanism is close to the upper cutting blade, so that the power transmission efficiency from the reciprocating drive mechanism is improved and the load applied to the upper knife head is reduced. Further, since the mounting position of the reciprocating drive mechanism is made closer, it is possible to reduce the size of the entire cutting blade mechanism.

[Brief description of the drawings]

1 is an overall plan view of a cutting blade mechanism, FIG. 2 is a side sectional view of the same, and FIG. 3 is a side sectional view of a conventional cutting blade mechanism. 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: Connection Department

Claims (1)

(57) [Scope of request for utility model registration] An upper cutting blade (11) and a lower cutting blade (13) are vertically overlapped and slidably held, and each cutting blade (11),
The knife heads (29) and (31) are fixed to (13), and are connected to the knife heads (29) and (31) to connect the upper and lower cutting blades (1).
In the mechanism provided with the reciprocating drive mechanism (35) for reciprocating 1) and (13) in the opposite direction, the upper knife head (29)
The center of gravity of the upper cutting blade (11)
A knife in a cutting blade mechanism in which a lower knife head (31) fixed to the lower knife blade (13) extends rearward from the upper knife head (31) so that the front of the lower knife head (31) can be lifted. Head structure.