JPS5837091B2 - Traveling pipe material cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a running pipe material cutting device that cuts a running pipe material to a fixed size while it is in a running state.

If we take an overview of the cutting blade mechanisms of this type of traveling pipe material cutting devices that have been used in the past or have been proposed recently, we can summarize that all of them apply linear motion to the cutting blade to cut the pipe material to be cut. It is configured to perform the cutting.

These include a cutting blade mechanism that is fixed to the machine base and consists of a lower blade and an upper blade that moves up and down, and a cutting blade mechanism that advances and retreats from the side to cut out the upper part of the pipe material to be cut before cutting with the upper blade. It can be roughly divided into a cutting blade mechanism with a notch blade added.

The former mechanism can be further classified into two.

One is a mechanism in which a fixed lower blade and a movable upper blade are arranged on a machine base that is moved back and forth by a reciprocating drive mechanism, and the upper blade is driven up and down by a crank mechanism.

Since this mechanism connects the drive source via a clutch, it has the disadvantage that it cannot perform continuous cutting at high speed, and it also has the disadvantage that dimples occur at the cut end when cutting the pipe material to be cut.

The other type uses the rotational movement of the crank to both raise and lower the upper blade and horizontally reciprocate the machine base.
A sliding body with an upper blade fixed to the vertical groove of the machine base is arranged so as to be able to slide up and down, a lower blade corresponding to the upper blade is fixed to the lower part of the vertical groove, and a rotary drive body is attached to the sliding body. It consists of a crank fixedly attached to the drive shaft of the motor and connected by a pin.

Although this mechanism enables continuous cutting at a much higher speed than the above-mentioned devices, it does not solve the problem of dimples forming at the cut end of the pipe to be cut.

Needless to say, the longitudinal groove must be set to a length corresponding to the required reciprocating stroke of the machine base, which increases the height of the machine base and increases the rotation radius of the crank. However, the disadvantage is that the device inevitably becomes large.

Furthermore, although this is not related to the cutting mechanism, in order to synchronize the machine base with the feeding speed of the pipe material to be cut, the speed at which the sine curve is drawn is made into a linear uniform motion in a predetermined section. Another problem is that a particularly expensive control device is required for this purpose.

The latter mechanism uses a notch blade that advances and retreats from the side to cut the upper part of the pipe at a desired position, as described above, in order to eliminate the dimples that occur at the cut end of the pipe to be cut. , and a cutting blade that moves up and down to cut the pipe material to be cut at the notch position.

However, although this mechanism has the effect of eliminating dimples, there is a separate problem in that the cutting speed cannot be increased because of interference between the notch blade and the cutting blade.

SUMMARY OF THE INVENTION The present invention has been made with the object of providing a running pipe material cutting device that solves all the drawbacks of the above-mentioned conventional examples. This idea was abandoned, and from a completely new perspective, a high-speed, dimple-free cutting method using the rotating motion of the cutting blade was devised.

Next, to summarize the configuration of the present invention, the machine base includes a notching rotary blade that notches the upper part of the pipe material to be cut that is fed on the material feeding line, and a rotary blade for notching the upper part of the pipe material to be cut that is fed on the material feeding line, and a rotary blade for cutting the pipe material to be cut at the notch position immediately after the notch. A running pipe material cutting system in which a rotary blade for cutting is arranged, and a spline shaft or a shaft with a sliding key is installed on both rotary blades to transmit rotational driving force while allowing reciprocating motion corresponding to the reciprocating motion of the machine. It is a device.

An embodiment of the present invention will be described below based on the drawings.

Two guide shafts 1, 1 are arranged in parallel at a predetermined interval,
The guide shafts 1, 1 are slidably inserted into brackets 3, 3 fixed to both sides of the machine base 2, so that the machine base 2 can be reciprocated within a required range.

The guide shafts 1, 1 are fixed to the external support.

A fixing mechanism for clamping the pipe material 18 to be cut is disposed at the center of the machine stand 2, slightly closer to one side, and a cutting rotary blade 8 is disposed closer to the other side.

A notching rotary blade 7 for notching the upper part of the tube material 18 to be cut is disposed substantially above the fixing mechanism.

Both rotary blades 7 and 8 are fixed in the circumferential direction and slidably in the axial direction on spline shafts 9 and 9 arranged parallel to the guide shafts 1 and 1 of the machine base 20 at corresponding positions, respectively.

Of course, it is also possible to install a shaft with a sliding key in place of the spline shaft 99 under the same conditions.

A rotary drive body is connected to the spline shafts 9, 9, or, if appropriate, a shaft with a sliding key, so as to rotate them at the same speed and in opposite directions.

For example, in FIG. 1, a spline shaft 9 (including a shaft with a sliding key) to which the notch rotary blade 7 is attached.

The same applies hereafter) is rotated clockwise, and the cutting rotary blade 8 is rotated clockwise.
The spline shaft 9 on which the spline shaft 9 is attached connects the rotary drive body for rotation in the counterclockwise direction.

This rotary drive body uses a variable drive source such as a DC motor, and shares the reciprocating drive mechanism of the machine base 2, which will be described later.

The rotational drive force is transmitted to the spline shafts 9, 9 via a suitable gear train.

As shown in FIG. 1, the notch rotary blade 7 has a blade fixed to the tip of a substantially trapezoidal base, and the rear end of the base is formed to be attached to a boss meshed with a corresponding spline shaft 9. The rotary cutting blade 8 has a semi-circular concave blade at the tip of a substantially trapezoidal base, and the rear end of the base is attached to a boss meshed with a corresponding spline shaft 9. It was formed.

The attachment relationship of the two rotary blades 7 and 8 to the spline shafts 9 and 9 is determined so that the cutting rotary blade 8 can cut the pipe material 18 to be cut immediately after the notch rotary blade 7 notches the upper part of the pipe material 18 to be cut. .

The bosses of both rotary blades 78 are supported by the frame 10 of the machine base 2, and the spline shafts 9, 9 are configured to reciprocate in accordance with the reciprocating movement of the machine base 2.

The fixing mechanism includes an immovable fixing part 5 having a semicircular groove on the inner surface;
Movable fixed part 6 having a similar semicircular groove on the surface facing this
The movable fixed part 6 is constituted by a drive mechanism that moves the movable fixed part 6 forward and backward toward the immovable fixed part 5 side.

Note that the semicircular groove described above forms the lower blade.

For example, as shown in FIGS. 1 and 2, the drive mechanism is connected to the frame 10 of the machine base 2 on the outside of the notch rotary blade 7.
cams 12, 12 attached to the boss of the rotary blade 7 for IL notching; a roller 13 rotatably mounted on the upper end of the L-shaped arms 11, 11;
13, length-adjustable pressing bodies 14, 14 screwed into the lower ends of the L-shaped arms 11, 11, and return springs 19, 19 attached to the movable fixed part 6.

When the boss rotates, the L-shaped arms ii, 1i perform a rotational movement in the counterclockwise direction in FIG. 14, the movable fixed part 6 is pressed against the immovable fixed part 5 (that is, the pipe material 18 to be cut is clamped).

When the rollers 13, 13 are released from the cams 12, 12, the movable fixed part 6 returns to its original position (unclamped) by the action of the return springs 19, 19, and the L-shaped arms 11, 11 move in the clockwise direction. Rotate to.

Needless to say, the cams 12, 12, when the notching rotary blade 7 and the cutting rotary blade 8 respectively notch and cut the pipe material 18 to be cut, the L-shaped arms 11, 11 press against the pressing body 1.
4 and 14 are pressed against the movable fixed part, that is, the shape is determined so that the movable fixed part 6 and the immovable fixed part 5 clamp the pipe material 18 to be cut.

Further, the lower part of the machine base 2 is provided with a cam groove 15 as shown in FIG. 3 in the unfolded state, and the spline shaft 9
A drum cam 16 connected to a rotary drive body shared with 9, and a cam groove 15 of the drum cam 16 disposed at the lower part of the machine base 2.
A reciprocating drive mechanism consisting of a driven roller 17 that fits into the drive roller 17 is provided.

When the rotary drive body is operated in this manner and the drum cam 16 is rotated, the driven roller 17 and the machine base 2 connected thereto will reciprocate along the cam groove 15 over a required distance.

In addition, the engagement between the cam groove 15 of the drum cam 16 and the driven roller 17 is such that the notching rotary blade 7 and the cutting rotary blade 8 can perform notching and cutting, respectively, near the middle of the forward stroke of the machine base 2. Determine the matching relationship.

Since this embodiment has been prepared as described above, when cutting the pipe material 18 to be cut to a predetermined length, first start the device,
The machine base 2, which is stopped in the middle of the go-around stroke, is operated to start reciprocating motion.

Since the machine base 2 is stopped in the middle of the backward stroke as described above, it starts operating from the remaining backward stroke.

The pipe material 18 to be cut is fed by a material feeding device (not shown),
It protrudes a predetermined length in front of the fixing mechanism at the beginning of the backward stroke of the machine base 2 and the subsequent forward stroke.

At the same time, the forward stroke speed of the machine base 2 operated by the reciprocating drive mechanism is synchronized with the material feeding speed, and then the fixing mechanism moves the pipe material 18 to be cut into the semicircular groove of both fixing parts 56. The eyelashes are fixed in place.

This cutting of the tube material 18 to be cut is performed by the rotary blade 78 approximately in the middle of the outgoing stroke synchronized speed section of the machine base 2.

The cutting of the tube material 18 by the two rotary blades 78 is performed at the predetermined time while the rotary blades 78 themselves reciprocate in response to the reciprocating movement of the machine base 2.

First, the notch rotary blade 7 notches the upper part of the cutting position of the pipe material 18 to be cut into a groove shape, as shown in FIG. The rotary blade 8 cuts the pipe material 18.

The rotational driving force of the rotary blade 78 is generated by the spline shaft 9,
9 while allowing its axial sliding.

Thereafter, the fixing mechanism becomes released, the speed of the machine platform 2 decreases, and then it begins a go-around stroke.

After the middle of the backward stroke, the above-mentioned operations will be performed in the same way.

That is, by repeating the above cycle, the pipe material 18 to be cut is continuously cut.

To briefly describe the process of transition to the subsequent cycle, the fixing mechanism is released and the machine base 2 drops below the synchronized speed, after which it passes through the homeward stroke and then returns to the synchronized speed described above in the next outward stroke. The tube material 18 to be cut continues to protrude in front of the fixing mechanism until the speed reaches the synchronized speed, and when the synchronous speed is reached, it protrudes a predetermined length.

In the above, double rotating blades 7 and 8 are spline shafts 9 and 9.
Since they are rotated in mutually opposite directions while maintaining the above-mentioned predetermined relationship, the cutting rotary blade 8 immediately after cutting the upper part of the cut pipe material 18 of the cutting rotary blade 7.
Even if the blades are cut at that position, the two rotary blades 7 and 8 do not interfere with each other, and the rotational speed, that is, the cutting speed can be increased.

In addition, since the rotational driving force for both rotary blades 7 and 8 is applied by the spline shafts 9 and 9, the machine base 2
It is possible to transmit sufficient driving force while smoothly following the reciprocating motion of the

Moreover, as shown in FIG. 4 and described above, this mechanism is designed to notch the upper part of the pipe material 18 to be cut using the notch rotary blade 7, and then to cut at the notch position using the cutting rotary blade 8. Therefore, no dimples will be formed at the cut end of the tube material.

Furthermore, the spline shafts 9, 9 and the drum cam 16 are
The rotary drive body can be easily shared via a gear train or the like, and since no clutch is involved, continuous cutting at higher speeds is possible.

The continuous cutting speed of this device is much faster than any of the prior art devices.

Therefore, as understood from the description of the embodiments above, the present invention can sufficiently achieve the intended purpose.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic front view, FIG. 2 is a partially cutaway schematic side view of FIG.
Fig. 3 is an explanatory diagram showing the cam groove of the drum cam when the drum cam is unfolded, and Fig. 4 is an explanatory diagram showing the notch in the upper part of the pipe material to be cut by the notch rotary blade and the cutting state of the notch position by the cutting rotary blade. It is a diagram. 1... Guide shaft, 2... Machine base, 3
...Curved bracket, 5...Imovable fixed part, 6...
...Movable fixed part, 7...Rotary blade for notch, 8
・Rotary blade for bending/cutting, 9...Spline shaft, 1o...Frame, 11...IJ
Shape 7-m, 12...Curved cam, 13...Curved roller, 14
...Press body, 15...Cam groove, 16.
... Drum cam, 17. Driven roller, 18. Curved cut pipe material, 19. Curved IJ turn spring.

Claims (1)

[Claims] 1. A cutting rotary blade that notches the upper part of the pipe material to be cut that is fed on the material feeding line and a cutting rotary blade that cuts the pipe material at the notch position immediately after the notch are arranged on the machine base, and both A running pipe material cutting device characterized in that a spline shaft or a shaft with a sliding key is disposed on each rotary blade to transmit rotational driving force while allowing reciprocating motion corresponding to the reciprocating motion of the machine base.