JPH072161Y2 - Cutting powder scattering device of portable cutting machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention rotates a cutting sprocket rotatably supported by a motor in a gear case and a cutting chain on a guide bar protruding forward from the gear case. The present invention relates to a cutting powder scattering device for a portable cutting machine which is wound so as to be freely driven.

[Conventional technology]

Conventionally, a chainsaw is known as a cutting machine of this type. The material to be cut by this chainsaw is mainly logs (wood), and high cutting precision is not required, so cutting with black lines is not performed.

Also, while chainsaw is limited to cutting wood,
The above portable cutting machine is capable of cutting hard materials such as metal, lightweight foam concrete, new building materials, hard synthetic resin, etc. (including punching, frame cutting, etc.) in addition to wood. Even if it is long, there is little wobbling of the chain, so highly accurate cutting is possible.

Therefore, in the cutting machine, in order to obtain high cutting accuracy, the cutting is often performed by drawing a black line.

[Problems to be solved by the device]

However, in the conventional cutting machine, since no countermeasure is taken against the cutting powder generated at the time of cutting, the cutting surface and the black line are hidden by the cutting powder to make it difficult to see, and the cutting workability is poor. Not only that, there is a problem that it is difficult to obtain a highly accurate cut.

The present invention has been made in view of the above problems of the prior art, and is configured to scatter the cutting powder on the cutting surface by using the cooling air of the motor, thereby working the portable cutting machine. It is an object of the present invention to provide a cutting powder scattering device capable of improving the cutting performance and the cutting accuracy.

[Means for Solving the Problems]

In order to achieve the above object, in the cutting dust scattering device of the portable cutting machine of the present invention, the cutting chain 10 is rotated by the sprocket 6 rotated by the motor 5 and the guide bar 7 protruding forward from the gear case 4. In a portable cutting machine which is wound so as to be freely drivable, and in which the guide bar is arranged substantially parallel to the motor shaft 5a of the motor in parallel to the motor shaft 5a, and scatters the cutting powder near the cut surface of the material to be cut. The outer end 13b is the cutting surface 1 of the material 14 to be cut by the cutting chain.
A discharge path 13 for the motor cooling air, which opens toward the vicinity of 4a and whose inner end 13a opens toward the fan 11 in the motor case 2, is connected to the inner cover 3, the gear case 4, and the guide bar retainer 9 in a substantially straight line, and A cutting powder scattering device for a portable cutting machine, wherein the discharge path and the opening of the cutting chain are separately provided.

[Action]

In the cutting dust scattering device configured as described above, the motor cooling air generated by the rotation of the motor fan is discharged to the outside through the discharge passage, but the outer end of the discharge passage is located on the front end face of the gear case. Since the chain opens to the vicinity of the cutting surface of the material to be cut, the motor cooling air is blown toward the vicinity of the cutting surface and scatters the cutting powder generated at the time of cutting.

Therefore, since the cut surface and the black wire are not covered with the cutting powder, the workability along the black wire can be improved and the cutting can be performed with high accuracy.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, the cutting machine body 1 is
The motor case 2, the inner cover 3 and the gear case 4 at the front end of the motor case 2 are sequentially connected and integrally formed, and the shaft 5a of the motor 5 installed in the motor case 2 is interlocked and connected via a gear transmission reduction mechanism (not shown). A drive sprocket 6 for the operating chain is pivotally supported in the gear case 4.

In addition, a guide bar 7 is fixed to the gear case 4 by a bolt nut through a guide bar retainer 9 so as to project to the front thereof, and is slidably fitted into an outer peripheral groove (not shown) of the guide bar 7 for cutting. A chain 10 is wound around the guide bar 7 and the sprocket 6 so as to be rotatable and driven.

A fan 11 for generating cooling air for the motor 5 is fixed to the motor shaft 5a, and the cooling air passes from the rear hole (not shown) of the motor case 2 through the inside of the motor case 2 to the inner cover 3 and the gear case 4. Ventilation hole provided in the upper part of
Although the air is blown from the outside to the outside, in the present invention, the discharge path 13 of the motor cooling air is communicated with the inside of the motor case 2 to the inner cover 3, the gear case 4, the guide bar retainer 9 separately from the ventilation hole 12. And the motor cooling air is blown from the discharge passage 13 to the front of the cutting machine body 1.

That is, the discharge passage 13 has its inner end 13a at the motor case 2
In the front part of the fan 11 inside, the exhaust passage 13 is opened at a position, shape and size where motor cooling air easily enters, while the outer end 13b has a cut surface 14a of the material 14 to be cut by the chain 10. It is formed so as to be opened toward the vicinity so that the motor cooling air is blown to the vicinity of the cutting surface 14a so that the cutting powder generated at the time of cutting is scattered far from the periphery of the cutting surface 13a. It is configured so that the cutting state (position, orientation, etc.) and the black line, etc. can be easily seen.

The ventilation holes 12 may be left as they are, but if the diameter of the ventilation holes 12 is reduced or completely closed, the ventilation efficiency of the discharge passage 13 can be further improved.

[Effect of device]

Since the present invention is configured as described above, since the cutting powder near the cutting surface 14a of the material to be cut 14 is scattered by the motor cooling air, the black wire and the like are not hidden and the cutting state can be seen well. Therefore, highly accurate cutting is possible and cutting powder does not scatter to the operator side.
The workability is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a cutting powder scattering device for a portable cutting machine according to the present invention, and FIGS. 2 and 3 are II-II line and III- line in FIG. Cross-sectional view taken along the line III,
FIG. 4 is a view on arrow A of FIG. 2 ... motor case, 3 ... inner cover 4 ... gear case, 5 ... motor 6 ... sprocket, 7 ... guide bar 9 ... guide bar retainer, 10 ... cutting chain 11 ... fan

Claims (1)

[Scope of utility model registration request] A sprocket (6) rotated by a motor (5) and a guide bar (7) protruding forward from a gear case (4) have a cutting chain (10) rotatably wound around the motor shaft (5a) of the motor. On the guide bar on the motor shaft
Arranged in parallel to 5a, in a portable cutting machine that scatters the cutting powder near the cut surface of the material to be cut, the outer end 13b is opened toward the vicinity of the cutting surface 14a of the material to be cut 14 by the cutting chain, The inner end 13a is connected to the fan 11 inside the motor case 2.
The discharge path 13 for the motor cooling air opening to the side is connected to the inner cover 3, the gear case 4, and the guide bar retainer 9 in a substantially straight line, and the discharge path and the opening of the cutting chain are separately provided. A cutting dust scattering device for a portable cutting machine.