JPH0871802A - Pipe cutting mechanism - Google Patents

Abstract

PURPOSE: To prevent the occurrence of a burr at the inner wall of a pipe cut part in pipe cutting work. CONSTITUTION: Pipe cutting mechanism is provided with a cutting part 1 rotatably held at one end by a holding part 2 and pressed downward by a pressing part 3. A cutting edge 11 and a cutting edge shift stopper 12 are formed at the cutting part 1, on the opposite side to the holding part 2. The cutting edge 11 cuts the cut part 51 of a pipe 5 by the action of the holding part 2 and pressing part 3 and simultaneously discharges chips 15 to the outside through a chip discharge part 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cutting blade structure, and more particularly to a cutting mechanism for cutting a pipe which is capable of cutting a metal or plastic pipe efficiently and has an extremely simple structure.

[0002]

2. Description of the Related Art This type of conventional pipe cutting machine is
The one shown in FIGS. 6A and 6B is known.

FIG. 6A is a schematic view showing a conventional example, FIG.
(B) is a sectional view of an essential part taken along the line AA 'in (a) and seen in the direction of the arrow.

In the figure, 21 is a rotary blade, 22 and 23 are pipe pressing parts, and 25 is a pipe to be cut.

During the cutting operation, each part is rotated, for example, as shown by the arrow, and the pipe 25 is cut as shown in FIG. 6 (b). When the pipe 25 is cut, a flash 25a is formed inside the cut portion of the pipe as shown in the drawing.

[0006]

As described above, when a pipe is cut by a conventional pipe cutting machine, burrs are formed on the inner side wall of the cut portion of the pipe, and the burrs cause various obstacles in the use of the pipe. And the work to remove this flash was added if necessary.

The present invention has been made in view of the above-mentioned conventional circumstances, and therefore an object of the present invention is to solve the above problems inherent in the prior art and to provide a simple structure and a cut surface of a cut pipe. It is an object of the present invention to provide a novel cutting device for cutting a pipe, which enables efficient cutting work operation without causing burrs on the inner wall.

[0008]

In order to achieve the above object, a cutting mechanism for cutting a pipe according to the present invention is provided with a blade arranged in a direction substantially perpendicular to the rotating direction of the pipe and facing the blade. Cutting means having a blade transition stopper provided at a position facing the blade to limit the cutting depth of the blade with respect to the pipe, and the blade and the stopper of the cutting means are rotatable toward the surface of the pipe And a pressing means for pressing the blade of the cutting means and the stopper against the pipe.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the accompanying drawings with reference to its preferred embodiments.

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a schematic perspective view, FIG. 2 is a schematic front view, and FIGS.
FIG. 5 is an explanatory diagram for explaining one embodiment of the present invention.

With reference to FIGS. 1-2, reference numeral 1 is
The cutting part which is the most important part of the cutting device for cutting a pipe according to the present invention is shown. The cutting portion 1 is provided with a blade 11 facing the portion to be cut of the pipe 5, a blade transition stopper 12 for limiting the cutting depth of the blade 11 with respect to the pipe 5, and a chip discharge portion 13 for discharging chips. Has been done.

The cutting part 1 is rotatably held by the holding part 2 with the holding part 2 as a fulcrum, and a pressing force is applied to the pipe 5 by the pressing part 3. Reference numeral 4 is a stopper for preventing the cutting portion 1 from descending more than necessary.

In the illustrated embodiment, the holding portion 2 has a structure in which the hole 61 formed in the cutting portion 1 is fitted to the shaft 61 provided in the main body 6, but conversely. A shaft may be formed in the cutting portion 1 and the shaft may be fitted in a hole formed in the main body 6.

Further, although the pressing portion 3 is formed of a coil spring in the illustrated embodiment, a leaf spring or the like may be used instead of the coil spring, and further, a pipe spring may be used without using such a spring. It may be constituted by a pressurizing means that constantly applies a constant force to the cutting portion with respect to the rotation of 5.

Next, the operation of the embodiment of the present invention will be described.

2 to 5, it is assumed that the pipe 5 is rotating in the illustrated arrow, that is, the counterclockwise direction. Here, the blade 11 of the cutting unit 1 is operated by the action of the holding unit 2 and the pressing unit 3.
The blade transition stopper 12 is moved to the cut portion 51 of the pipe 5, the blade 11 starts to cut the cut portion of the pipe 5, and the blade shift stopper 12 is the surface of the cut portion (shaded portion) 51 of the pipe 5. Located slightly above, blade 11
The depth of cut for the pipe is controlled so as to have a predetermined thickness.

That is, when the cut end of the blade 11 is cut into the cut portion 51 of the pipe 5, the stopper 12 abuts against this cut portion 51, and the blade 11 is further cut into the cut portion 51 of the pipe 5 any further. Restrict getting crowded. This cutting operation is repeated with the rotation of the pipe 5, and progresses as shown in FIGS. As shown in FIGS. 4A and 4B, the cut portion 51 of the pipe 5 becomes extremely thin, and the pipe 5 is completely cut as shown in FIG.

In the present invention, since the cutting portion 1 operates as described above, no burrs are produced on the inner wall of the pipe cutting surface.

In the above-described embodiment of the present invention, the cutting portion 1 is fixed and the pipe 5 is rotated. On the contrary, the cutting portion 1 is rotated and the pipe 5 is fixed. It is also possible to make it the structure which was carried out. In this case, the holding part 2 and the pressing part 3 rotate together with the cutting part 1.

[0020]

As described above, according to the present invention,
With the extremely simple structure, it is possible to efficiently cut the pipe without causing burrs on the inner wall of the cut portion of the pipe as shown in the prior art.

According to the present invention, since the means for making the cutting depth of the blade in the pipe constant is provided,
Random cutting of the blade deep into the pipe is prevented, and this also has the effect of further improving workability.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention.

FIG. 2 is a schematic front view showing an embodiment of the present invention.

FIG. 3 is a schematic diagram for explaining the operation of one embodiment of the present invention.

4A and 4B are schematic diagrams for explaining the operation of one embodiment of the present invention, and FIG. 4A is a schematic front view.
(B) is a sectional view of a main part of (a).

FIG. 5 is a schematic diagram for explaining the operation of one embodiment of the present invention.

6A and 6B are schematic views showing a conventional example,
(A) is a front view, (b) is sectional drawing cut | disconnected along the AA 'line of (a), and was seen in the direction of the arrow.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cutting part 11 ... Blade 12 ... Blade shift stopper 13 ... Chip discharge part 14 ... Hole 15 ... Chip 2 ... Holding part 3 ... Pressing part 4 ... Stopper 5 ... Pipe 51 ... Cut part 6 ... Main body 61 ... Shaft

Claims (5)

[Claims] 1. A cutting means having a blade arranged in a direction substantially perpendicular to a rotation direction of the pipe, and a holding means for rotatably holding the blade of the cutting means toward a surface of the pipe. A cutting mechanism for pipe cutting, comprising: a pressing unit that presses the blade of the cutting unit against a cut surface of the pipe. 2. The cutting for pipe cutting according to claim 1, further comprising a blade transfer stopper for limiting a cutting depth of the blade with respect to the pipe, at a position of the cutting means facing the blade. mechanism. 3. The cutting mechanism for pipe cutting according to claim 1, wherein the pressing means is a spring. 4. The cutting mechanism for pipe cutting according to claim 1, wherein the pressing means applies a constant pressure to the cutting means. 5. The pipe cutting cutting mechanism according to claim 2, further comprising a chip discharging portion provided between the blade of the cutting means and the stopper.