JPS6127692Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a chipper for cutting wood chips.

A plurality of cutting blades are attached to the rotor in a substantially radial arrangement, and a receiving blade is fixed to the tip of a wood supply gutter facing the rotation trajectory of the cutting blades in front of the rotor, and the cutting blade and the receiving blade are used to cut wood. Chitzpah is commonly known.

Conventionally, the chipper blade structure as described above has a cutting blade attached to a rotor, a receiving blade fixed to a supply trough, and a double-edged blade having a straight edge.

In this type of knife structure, the edge of the cutting edge cuts into the wood supported by the receiver, so the relationship between the edge of the edge of the double-edged tool is exactly the same as that of push-cutting with straight scissors.

However, in cutting similar to straight scissors, the cutting angle of the cutting edge changes greatly between the beginning and the end of the cut, and not only is it impossible to achieve a uniform cutting effect, but the cutting angle of the cutting edge varies in proportion to the change in the cutting angle. There is a problem in that the force pushing the wood sideways increases, making the supply of wood extremely unstable.

This idea was made to solve the above-mentioned problems, and in addition to forming the cutting edge of the cutting tool into an arcuate or angular protruding shape, a protrusion of the same shape as the cutting edge was formed on the front surface of the rotor. The purpose of the present invention is to provide a chipper that has a gentle cutting angle change at the cutting edge, has excellent cutting effects, can obtain chips of uniform length, and can prevent horizontal wobbling of the supplied wood. .

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in the figure, the chipper has a rotor 2 rotated within a casing 1 arranged in an inclined manner.
A supply gutter 3 for wood A is faced in front of the rotor 2, and a plurality of cutting blades 4 are attached to the rotor 2, and a receiving blade 5 is attached to the tip of the feed gutter 3.

In the case of the embodiment shown in FIGS. 1 and 2, the cutting blade 4 is attached to the rotor 2 by providing a plurality of attachment holes 6 in the rotor 2 in the form of long holes parallel to the radial axis of the rotor 2. A wide cutting tool 4 is inserted into this mounting hole 6 using a cutting tool holder 7 and a bolt 8.
is fixed to the front surface of the rotor 2 so as to protrude by a predetermined length.

To attach the blade 5, attach the tool rest 10 to the lower part of the sliding plate 9 provided at the tip of the supply gutter 3, and place the blade 5 on the tool rest 10 so that its cutting edge 5a is cut in front of the rotor 2. Fix it with a bolt 11 so as to face the range of rotation locus of the cutter 4, and cut the wood A with the cutter 4.
It is now used to cut.

As shown in FIG. 5, the cutting edge 4a of the cutting tool 4 is formed to protrude so that the amount of protrusion is greatest at the center of the blade width.

The protruding shape may be an arc as shown in FIG. 5, or a triangular or polygonal shape.

Further, the blade edge 5a of the receiving blade 5 is connected to the cutting blade 4.
It is formed into a concave shape as shown in FIG. 6 so as to correspond to the blade edge 4a. Therefore, the shape of the recess is not only an arc but also a triangle or a polygon.

The cutting blade 4 is arranged so that the blade width direction is parallel to the radial axis of the rotor 2 at an appropriate distance, as shown in FIG. On the other hand, the knife 5
are arranged parallel to the radial axis of the rotor 2, as shown by the dashed line in FIG.

Due to the arrangement relationship between the cutting blade 4 and the receiving blade 5,
The cutting edges 4a and 5b perform cutting while changing as shown in FIGS. 3 and 6. That is, since the cutting blade 4 rotates around the axis of the rotor 2 with respect to the cutting edge 5a of the receiving blade 5 which is fixed in a fixed position,
The intersecting portion of the cutting edge 4a of the cutting tool 4 moves from the end of the cutting edge 5a of the receiving tool 5 closer to the rotor center to the outer end.

The cutting edge 4a of the cutting tool 4 protrudes in an arc shape or a square shape,
Since the cutting edge 5a of the receiving blade 5 is recessed, the cutting angle formed by the cutting edges 4a and 5a does not change significantly at any position of the blade width, as shown in FIG. The cutting performance is constant from the beginning to the end due to the principle of the cutting edge slope.

When cutting the wood A with the cutting blade 4, the cutting edge 4
It will be cut into the protruding shape a, but if the cut shape and the shape of the cutting edge 4a of the next cutting tool do not match, uneven pressure will be applied to the wood A, causing lateral wobbling in the wood A. do.

For this reason, on the front surface of the rotor 2, a protrusion 12 having a protruding shape equal to the blade edge 4a of the cutting blade 4 is provided at a position between the cutting blades 4.

The protrusion 12 is provided along the entire length of the cutting tool 4 in the blade width direction, and it is desirable that the protrusion height from the rotor 2 is slightly lower than the amount of protrusion of the cutting edge 4a.

Note that the cutting blade 4 to be attached to the rotor is not limited to a wide single piece as shown in Fig. 2, but can also be a split cutting blade that is attached at different positions in the rotational direction of the rotor 2. In this case, each Protrusions of the same shape may be provided for the cutting blades, but as shown in FIG. 7, protrusions as many as the number of divided cutting blades may be formed on a wide protrusion.

Although the illustration shows an example in which the blade 5 is used, it is also possible to omit this and use the tip of the sliding plate 9 as the blade. In this case, the tip edge of the sliding plate 9 is aligned with the cutting edge of the cutting blade 4. It is designed to correspond to the shape.

Further, the bottom surface of the supply gutter 3 is formed into a concave surface that matches the shape of the cutting edge of the cutting tool 4 when viewed from the front.

The chipper of this invention has the above-mentioned configuration, and when the drum 2 is rotated while the wood A is fed into the supply gutter 3 and pushed in, the lower end of the wood A is supported by the receiving blade 5, and this receiving The portion protruding from the edge 5a of the blade 5 is sequentially cut into chips by each of the rotating cutting blades 4.

At the time of cutting, the protrusion 12 first slides on the cut end surface of the wood A. Therefore, the cut end surface of wood A has a concave shape cut by the previous cutting tool, and the protrusion 1
After this positioning, the cutting edge edge 4a of the cutting blade is moved to match the shape of the wood A.
Cut.

Therefore, the recessed shape of the tip of the wood A and the edge 4a of the cutting tool 4 match, and the amount of cutting by the edge 4a becomes uniform over the entire length of the blade width, making it possible to cut chips of uniform length. It turns out.

As described above, according to this invention, the cutting edge of the cutting blade attached to the rotor is formed into an arcuate or square protruding shape, and a protrusion equal to the shape of the blade edge is provided between each cutting blade on the front surface of the rotor. Therefore, before cutting with the cutting tool, the protrusion slides past the cutting end surface, and the cutting end surface of the wood is adjusted to match the shape of the cutting edge, and then the cutting begins. Therefore, the amount of wood cut over the entire length of the cutting edge of the cutting tool is It is possible to cut out chips of equal length.

In addition, after the wood is positioned with the protrusions, cutting is performed with an even depth of cut, so there is less force to press the wood in the lateral direction, and the lateral wobbling of the wood is effectively prevented. It can be prevented.

Furthermore, since the cutting edge of the cutting tool is formed into an arcuate or square protruding shape, the change in cutting angle is small from the beginning to the end of cutting, the effective cutting angle with the receiving tool is small, and the cutting edge slope is small. Since cutting is performed according to the principle, cutting performance is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing the main parts of the chipper according to this invention, FIG. FIG. 5 is a front view of the cutting tool used in the above, FIG. 6 is an explanatory diagram showing the relationship between the cutting edges of the cutting tool and the receiver, and FIG. 7 is a cross-sectional plan view showing another example of the protrusion provided on the rotor. . 1 is a casing, 2 is a rotor, 4 is a cutting tool, 4
a is the cutting edge of the cutting tool, 5 is the receiving tool, 5a is the cutting edge of the receiving tool, and 12 is a protrusion.

Claims (1)

[Scope of utility model registration request] A cutting tool having a protruding arc or rectangular cutting edge is attached to the rotor, and a protrusion having the same shape as the cutting edge is provided between the cutting tools on the front surface of the rotor from which the cutting edge protrudes. Chitzpah.