JPS588417Y2 - Rotary cutting device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotano cutting device for cutting pipes and the like.

Generally, a rotary cutting device is configured so that a material to be cut, such as a pipe, is passed between a pair of rotary cutters, and the cutter acts on the pipe to cut it.

Conventionally, with this type of cutting device, when the material to be cut is a pipe, it is difficult to deform the material during cutting or cut with uniform pressure, and the structure is complicated. there were.

This invention aims to improve the conventional drawbacks as described above.

Hereinafter, one embodiment of this invention will be described in detail using the drawings.

What is shown in FIG. 1 is a rotary cutting device 1 for cutting a pipe P, which is a material to be cut.This rotary cutting device 1 includes a cutting section 3 for holding and cutting the pipe P, and a It is composed of an operating mechanism section 5 for operating a part of the cutter in the section 3, a drive device 7 for rotationally driving the cutting section 3 and the operating mechanism section 5, and the like.

A pipe holding shaft 9 for holding the pipe P is formed in a hollow 11 in the cutting section 3, and the front end (left side in FIG. 1) of this pipe holding shaft 9 is used to introduce the pipe P. The introduction part 13 is formed into a trumpet shape for ease of use.

The pipe holding shaft 9 is fixed to a frame 21, which will be described later, and has a cutter operating shaft 17 rotatably supported on its outer circumference via bearings 15, 15.

The front end of this cutter operating shaft 17 is rotatably supported by a frame 21 via a bearing 19, and the other end is supported by a cutter rotating shaft 2 via bearings 23, 23.
5 is rotatably supported.

The cutter rotating shaft 25 is connected to the frame 21 via a bearing 27.
It is rotatably supported.

The rear end portion of the cutter rotating shaft 25 has a larger diameter than the main body portion and is provided with a flange portion 27. A cutter arm 31 with a cutter 29 removably mounted thereon is attached to the support pin 33 on the flange portion 27. It is rotatably attached via the .

A long hole 35 of an appropriate length is diagonally provided in the cutter arm 31 at a position separated from the support pin 33 by a suitable distance. A provided arm operating pin (arm operating member) 39 is engaged.

The cutter 29 is supported by a cutter support member 41, and the cutter support member 41 is fixed to the cutter arm 31 via a fastener 43 such as a bolt.

The cutter support member 41 is provided with an escape hole for the fastener 43, that is, a counterbore hole 45 and a long hole 47, in the cutter arm 31 so that its attachment position can be changed.

Engaging portions 49.51 such as serrations or racks are provided on the contact surfaces of the cutter support member 41 and the cutter arm 31, and by engaging these retaining portions 49.51 with each other, , cutter support member 41
can be attached to the cutter arm 31 at any position.

Spur gears 53 and 55 are mounted on each of the cutter operating shaft 17 and cutter rotating shaft 25 through keys 57 and 59, respectively.

Each of the spur gears 53 and 55 is provided in mesh with the spur gear 61 and 63 in the actuating mechanism section 5, respectively.

The spur gear 61 is attached via a key 69 to a hollow rotating shaft 67 rotatably supported by the frame 21 via a bearing 65.

In the hollow part of the rotating shaft 67, one end thereof is provided with a bearing 71.71.
A shaft 75 as a drive shaft is mounted and supported on the rotating shaft 67 via a shaft 67, and the other end is supported on the frame 21 via a bearing 73.

The spur gear 63 is attached to this shaft 75 via a key 77.

The front end of the shaft 75 is formed into a helical gear 79 having an appropriate nodal angle, and a slide member 81 meshes with the helical gear 79 via a helical gear 83.

A spur gear 85 is provided on the outer periphery of the slide member 81, and this spur gear 85 is provided to mesh with an internal gear 87 provided at the front end of the rotating shaft 67.

That is, when the slide member 81 is moved in the left-right direction in FIG. 1, the rotating shaft 67 rotates by the amount of lead moved by the helical gears 79, 83 in accordance with the movement.

Note that the slide member 81 can be operated via a suitable shifter device (not shown).

A pulley 89, such as a V-pulley, is attached to the rear end of the shaft 75 via a key 91.
It is interlocked and connected to the drive device 7 via an endless band 93 such as a belt.

That is, the pulley 89 is interlocked and connected via an endless band 93 to a drive pulley 99 that is attached to a drive shaft 95 of a drive device 7 such as a motor via a key 97.

In the above configuration, the operation of this invention will be explained.

Before explaining the cutting action of the pipe P, which is the material to be cut, the working relationship between the slide member 81 and the cutter 29 will be explained.

When the slide member 81 is moved to either side in the left or right direction in FIG. 1, for example to the right, the slide member 8
1 is rotated by a lead corresponding to the amount of movement thereof by the action of the helical gears 79 and 83.

This rotation of the slide member 81 causes the rotating shaft 67 to rotate via the spur gear 85 and the internal gear 87, and further rotates the cutter operating shaft 17 via the spur gears 61.53.

That is, the cutter operating shaft 17 is the cutter rotating shaft 25.
It will be rotated relative to.

When the cutter operating shaft 17 rotates, the arm operating pin 39
moves from the position shown by the solid line to the position shown by the imaginary line in FIG. 2, for example.

During this movement, the arm operating pin 39 moves along the elongated hole 35 of the cutter arm 31, and in the process of movement, the cutter arm 31 is oscillated about the support pin 33 to the position shown by the imaginary line.

Therefore, when the slide member 81 is operated, for example, to the right, the cutter 29 moves from the position shown by the solid line to the position shown by the imaginary line in FIG. It will move from the position in the direction of the position shown by the solid line.

The cutter 29 is operated via the slide member 81 to the position shown by the solid line in FIG. 2 to drive the drive device 7.

Then, the drive pulley 99, the endless belt 93, and the pulley 89
, the shaft 75 is rotationally driven via the key 91.

When the slide member 81 is not operated in any way,
The cutter operating shaft 17 and the cutter rotating shaft 25 rotate synchronously.

That is, helical gear 79.83 and spur gear 85,
The rotary shaft 67 is rotated via the internal gear 87, and the cutter operating shaft 17 is rotated via the spur gear 61.53.
is rotated, while the cutter rotating shaft 25 is rotated via the spur gear 63.55.

In this state, the pipe P is inserted into the holding shaft 9.

Then, the cutting position in the pipe P is made to face the cutter 29, and the insertion is stopped.

Next, the slide member 81 is operated to the right to gradually move the cutter 29 in the direction indicated by the imaginary line.

Then, during the movement process, the cutter 29 first comes into contact with the outer peripheral surface of the pipe P, and then gradually cuts the pipe P, and when the outer peripheral part of the cutter 29 reaches the thick inner surface of the pipe P, the cutting is completed.

When cutting is completed, the slide member 81 is operated to the left to return the cutter 29 to the position indicated by the solid line, and the pipe P is pushed in a desired amount to set it at a predetermined cutting position.

In this way, the material to be cut, such as the pipe P, can be efficiently cut without deforming it.

In particular, in this invention, the mounting position of the cutter 29 is also
By changing the engagement positions of the engagement parts 49 and 51, it can be set to any desired position, so it is very easy to use when cutting pipes of different diameters or pipes with different wall thicknesses, as shown in Fig. 3, for example. It is valid.

This allows the cutting stroke of the cutter 29 to be set large.

In short, the gist of this invention is to provide a hollow holding shaft 9 into which a material to be cut such as a pipe can be inserted, and to fit an annular rotating shaft 25 into the holding shaft 9 so that it can be rotated freely. A cutter arm 31 equipped with a cutter 29 is attached to the end of the rotating shaft 25 so as to be swingable in a direction perpendicular to the axis of the holding shaft 9, and the holding shaft 9 and the rotating shaft 25 are connected to each other.
An annular operating shaft 17 is interposed between the operating shaft 1 and the operating shaft 17 and is rotatable in synchronization with and relatively rotatable with the rotating shaft 25.
An operating member 39 for swinging the cutter arm 31 only when the operating shaft 17 rotates relative to the rotating shaft 25 is provided at the end of the rotating shaft 7, and the driving shaft is interlocked with the rotating shaft 25. One end side is rotatably supported on a cylindrical rotating shaft 67 interlockingly connected to the operating shaft 17, and a slide member 81 is supported on the cylindrical rotating shaft 67 so as to be movable only in the axial direction. Although the rotary cutting device is characterized by meshing the formed helical gear 83 with the helical gear 79 formed at one end of the drive shaft, it has a simple structure and can be used even when the rotating shaft etc. are stopped. , the cutter arm can be oscillated.

[Brief explanation of drawings]

The drawings show one embodiment of this invention, and FIG. 1 is a cross-sectional explanatory view of a rotary cutting device according to this invention, and FIGS. 2 and 3 are enlarged explanatory views of essential parts, respectively. Explanation of the symbols representing the main parts of the drawing 9...
Pipe holding shaft, 17... shaft, 25...
Rotating shaft, 29...Cutter, 31...
Cutter arm, 39... Operating member (operating pin), P... Material to be cut (pipe).

Claims (1)

[Scope of utility model registration request] A hollow holding shaft 9 into which a material P to be cut such as a pipe can be inserted is provided, and an annular rotating shaft 25 is fitted onto the holding shaft 9 so as to be rotatably driven, and a cutter is attached to the end of the rotating shaft 25. A cutter arm 31 having a cutter arm 29 is provided so as to be swingable in a direction orthogonal to the axis of the holding shaft 9, and is provided between the holding shaft 9 and the rotating shaft 25 so as to be able to rotate in synchronization with the rotating shaft 25. A relatively rotatable annular operating shaft 17 is interposed therebetween, and the cutter arm 31 is oscillated at the end of the operating shaft 17 only when the operating shaft 17 rotates relative to the rotating shaft 25. An actuating member 39 for movement is provided, and one end side of a drive shaft interlockingly connected to the rotating shaft 25 is rotatably supported on a cylindrical rotating shaft 67 interlockingly connected to the actuating shaft 17. A rotary cutting device characterized in that a helical gear 83 formed on a slide member 81 supported movably only in the axial direction by a rotating shaft 67 of a shape meshes with a helical gear 79 formed at one end of the drive shaft. .