JPH07124819A - Rotary cutting device - Google Patents

Abstract

PURPOSE:To provide a rotary cutting device suitable for cutting long and wide steel products. CONSTITUTION:This rotary cutting device has a holder 3 provided on a device main body 2, a rotary driving means 4 provided to the holder 3, and a rotary cutting edge 5 rotated by the rotary driving means 4. And the holder 3 is journalled rotatable to move the cutting edge 5 between a cutting position and a waiting position. Furthermore, a moving means 20 to move the rotary driving means 4 reciprocating to separate from or to approach to the journalling part of the holder 3 is provided to the rotary cutting device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cutting device used for cutting steel products and the like, and more particularly to a rotary cutting device suitable for cutting long and wide steel products.

[0002]

2. Description of the Related Art Conventionally, a simple and portable rotary cutting device has been used for cutting an elongated steel material. This apparatus includes an apparatus main body, a support body provided on the apparatus main body, a rotation drive means provided on the support body, and a rotary cutting blade rotated by the rotation drive means. A support is rotatably supported by the apparatus main body so that the rotary cutting blade can be moved between the cutting position and the standby position. In order to cut a steel material with this rotary cutting device, first, the steel material is fixed at a predetermined position by a gripping means suitably provided in the main body of the apparatus, the rotary cutting means rotates the rotary cutting blade at a high speed, and a handle provided on the support body. Touch the rotary cutting blade with the steel by operating and apply force to gradually cut.

[0003]

However, when the width of the steel material or the like to be cut by the above device is large, the cutting cannot be completed by one handle operation.
After temporarily stopping the device to change the steel material position, it was necessary to perform the cutting operation again. Therefore, there is a problem in that, in addition to a decrease in work efficiency due to repeating the cutting operation a plurality of times, a large amount of labor is required to transfer a long and heavy steel material. Further, there is a problem that the cut surface is likely to be uneven due to cutting a plurality of times. Then, this invention makes it a subject to improve the problem of such a conventional rotary cutting device.

[0004]

That is, the present invention comprises a support provided on the main body of the apparatus, a rotary drive means provided on the support, and a rotary cutting blade rotated by the rotary drive means. The support is a rotary cutting device that is rotatably supported by the main body of the device so that the rotary cutting blade can be moved between a cutting position and a standby position. And this device has
Further, it is characterized in that a moving means is provided for reciprocating the rotation driving means in a direction of moving away from or approaching the shaft supporting portion of the support. In a preferred embodiment of the present invention, when the support is moved so that the rotary cutting blade is at the cutting position, there is provided a latching means for latching the support to the main body of the apparatus, and the rotating means is driven by the moving means. Is provided with a release means for releasing the engagement by the engagement means when it has moved to the preset cutting end position. In another preferred embodiment of the present invention, in a device provided with the above-mentioned hooking means and releasing means, a load detecting means for detecting the load value of the rotation driving means, and a load by the load detecting means. Load control means is provided for controlling the moving speed of the moving means so that the amount does not exceed a predetermined value.

[0005]

In the rotary cutting device of the present invention, the rotary cutting means rotates the rotary cutting blade at a high speed, and the handle provided on the support rotates the rotary cutting blade to bring it into contact with the steel material for cutting. Even in the case of wide steel, etc., when the cutting progresses to the cutting position, the moving means may move the rotation driving means in the direction of moving away from or approaching the shaft supporting portion of the support body to continue the cutting. it can. Therefore, the cutting operation can be completed once with the steel material or the like fixed.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is a front view showing an example of the rotary cutting device of the present invention. The rotary cutting device 1 includes a device main body 2, a support 3 provided on the device main body 2, a rotation driving means 4 provided on the support 3,
It is equipped with a rotary cutting blade 5 rotated by a rotary drive means 4 such as a variable speed motor capable of changing the rotational speed according to frequency, and is compact in size and portable. The apparatus main body 2 has a substrate 6 and a pedestal 7 provided thereon, and the support 3 is connected to the pedestal 7 by a shaft 8 and is rotatably supported. The apparatus main body 2 is further provided with a gripping means 10 for detachably fixing an object 9 to be cut such as a steel material. This gripping means 10 has a stopper body 11 fixed to the base plate 6 and a pressing plate 13 fixed to the tip of a screw rod 12, and the screw rod 12 is screwed to a bearing portion 14 having a female screw to form a rear end. By rotating the handle 15 attached to the section, the handle 15 is reciprocated in the horizontal direction.

The support 3 has an elongated rectangular support portion 16 whose upper portion is open, and the rotation drive means 4 is mounted on the support portion 16. Then, a spring means 17 is provided between the support portion 16 and the substrate 6, and the spring means 17 acts so that the support body 3 to which the rotation driving means 4 is attached is brought into a standby state in which the support body 3 is tilted upward from the state shown in the drawing. . The output shaft of the rotary drive means 4 is connected to the shaft of a disk-shaped rotary cutting blade 5. The power supply terminal of the rotation driving means 4 is connected to the control device 50 (FIG. 4) by a cable (not shown). Further, for safety, a cover 18 covering the upper half of the rotary cutting blade 5 is fixed to the rotary drive means 4, and an operation handle 19 is obliquely fixed to the side surface of the cover 18. Then, by rotating the operation handle 19, the support body 3 on which the rotation driving means 4 is mounted is rotated.

The present apparatus is further provided with a moving means 20 for reciprocating the rotation driving means 4 in a direction of moving away from or approaching the shaft supporting portion of the support 3. Transportation 20
Is a movable body 21 for sliding and moving the rotation driving means 4 along the support portion 16 of the support body 3, and is rotatably supported by bearings 22 and 23 provided at both ends of the support portion 16, and 21. A screw rod 24 screwed to a female screw provided in a through hole of 21, and a driving means such as a variable speed motor having an output shaft connected to an end portion of the screw rod 24 via a bevel gear device 25. It is composed of 26. As such a variable speed motor, one that can change the rotation speed by frequency as described above, one that changes the rotation speed by changing the voltage, and one that changes the rotation speed by pulse control ( A pulse motor) or the like can be used.

A latching portion 27 is provided on the pedestal 7 of the apparatus main body 2, and the latching portion 27 is provided on the support portion 16 when the support body 3 is in the state shown in FIG. It can be hooked with the hook means 28. The hook means 28 is urged by a spring means (not shown) in a direction in which it is hooked on the hook portion 27, and the hook means 28 is rotated and hooked against the urging force. The support body 3 is attached to the apparatus main body 2 by the hooking portion 27 and the hook means 28.
A hooking means 29 for hooking the hook is constructed. On the other hand, a toggle 30 is provided on the moving body 21, and the moving body 21 moves to the right in the figure as shown by an arrow to push the bar 31 attached to the hook means 28 to push the hook 31. The locking by the stopping means 29 is released. The toggle 30 and the bar 31 constitute a releasing means 32.

FIG. 2 is a front view showing another example of the rotary cutting device of the present invention, and FIG. 3 is a side view thereof. The device is different from the device shown in FIG. 1 only in the structure of the moving means 20, and the other parts are substantially the same. Therefore, the same parts as those in the apparatus of FIG. 1 are designated by the same reference numerals. The moving means 20 is a rack 40 provided on the support portion 16 of the support 3, and the rack 4
It is composed of a pinion 41 which is meshed with 0 and can be rotated, and a drive means 26 such as a variable speed motor connected to the shaft of the pinion 41.

FIG. 4 is a block diagram for explaining an example of a control device of the device shown in FIG. 1 or 2. Control device 50
Is sequencer 51, blade feed cutting pressure program circuit 5
2. It has a blade feed speed automatic adjustment circuit 53, an inverter 54, and a load detection means 55 such as a current detector. Then, the blade feed cutting pressure program circuit 52 outputs the result of comparison calculation of the blade feed cutting pressure value set by the material switching setting means 56 and the load value of the rotary drive means 4 detected by the load detecting means 55 as a control signal. It has become. Further, the blade feed cutting pressure program circuit 52 is inputted with an engagement detection signal (not shown) from engagement detection means such as a limit switch for detecting engagement by the engagement means 29. . Then, the control signal is output to the sequencer 51 by the latch detection signal.

The sequencer 51 receives a control signal from the blade feed cutting pressure program circuit 52 and outputs a drive control signal to the blade feed speed automatic adjustment circuit 53 in response to the control signal.
The blade feed speed automatic adjustment circuit 53 receives this signal and outputs a speed control signal to the drive means 26 of the moving means 20 to optimally control the speed, that is, the load of the rotary drive means 20 does not exceed a preset value. The drive means 26 is driven and controlled as described above. And these sequencer 51, blade feed cutting pressure program circuit 52, and blade feed speed automatic adjustment circuit 53
The load control means 59 is configured by the above.

On the other hand, the sequencer 51 is operated by a start / stop switch 57, and the rotation speed of the rotation driving means 4 is controlled by a built-in rotation setting means (not shown). That is, the inverter 54 is controlled by the signal from the rotation setting means, the power supply frequency to the rotation driving means 4 is changed, and the rotation speed thereof is controlled. In order to make the adjustment of the blade feed speed automatic adjustment circuit 53 more reliable, a speed detection means 58 such as a tacho generator is connected to the output shaft of the drive means 26, and the detection signal is sent to the blade feed speed automatic adjustment circuit 53. It has been fed back.

The operation of the apparatus shown in FIG. 1 will be described. First, the material feed means 56 sets the blade feed cutting pressure in the blade feed cutting pressure program circuit 52 according to the material of the object 9 to be cut. Next, after the workpiece 9 is gripped and fixed by the gripping means 10, the sequencer 51 is started by the start / stop switch 57 to start the rotation driving means 4 and rotate the rotary cutting blade 5 at a set speed. Then, the operation handle 19 is operated to rotate the rotary cutting blade 5 in the arrow direction from the standby position. As a result, the cutting of the object 9 is started. When the cutting progresses and the rotary cutting blade reaches the cutting position, the support body 3 and the apparatus main body are hooked by the hooking means 29, and hence the operation handle 19 is released to maintain the state. When this hooking state is detected by the hook detecting means as described above, the control signal is output from the blade feed cutting pressure program circuit 52 to the sequencer 51 by the signal, and the blade feed speed automatic adjusting circuit 53 is thereby caused. It operates to drive the moving means 20 at the speed controlled as described above.

When the rotary cutting blade is moved by the moving means 20 to reach a position where the cutting of the object 9 is completed, the releasing means 32 is operated, and the hooking means 29 releases the hooking of the support 3 and the apparatus main body. The support body 3 is rotated and the rotary cutting blade 5 is returned to the standby state. When the hooking state is released, the hooking detection signal from the hooking detecting means is stopped, and thereby the control signal from the blade feed cutting pressure program circuit 52 is also stopped, and the moving means 20 returns to the initial state. The program for returning to the initial state is set in the sequencer 51 in advance. The above operation is similarly performed in the device of FIG.

[0016]

Since the present invention has the above-mentioned structure,
It is possible to cut with a single cutting operation while a wide object such as a steel material is fixed. Therefore, there is no problem that the work efficiency is reduced by repeating a plurality of times as in the conventional case, and a problem that much labor is required to transfer a long and heavy steel material,
There is no problem of unevenness of the cut surface caused by cutting a plurality of times.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a rotary cutting device of the present invention.

FIG. 2 is a front view showing another example of the rotary cutting device of the present invention.

FIG. 3 is a side view of the rotary cutting device of FIG.

4 is a block diagram of a control device for controlling the rotary cutting device of FIGS. 1 and 2. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary cutting device 2 device main body 3 support body 4 rotation drive means 5 rotation cutting blade 6 substrate 7 mount 8 shaft 9 object to be cut 10 gripping means 11 stopper body 12 screw rod 13 pressing plate 14 bearing portion 15 handle 16 support portion 17 spring Means 18 Cover 19 Operation handle 20 Moving means 21 Moving body 22 Bearing 23 Bearing 24 Screw rod 25 Bevel gear device 26 Driving means 27 Hooking portion 28 Hooking means 29 Hooking means 30 Toggle 31 Bar 32 Release means 40 Rack 41 Pinion 50 Control Equipment 51 Sequencer 52 Blade feed cutting pressure program circuit 53 Blade feed speed automatic adjustment circuit 54 Inverter 55 Load detection means 56 Material switching setting means 57 Start-stop switch 58 Speed detection means 59 Load control means

Claims (3)

[Claims] 1. A support body 3 provided on an apparatus main body 2, a rotary drive means 4 provided on the support body 3, and a rotary cutting blade 5 rotated by the rotary drive means 4, the support body comprising: The body 3 is a rotary cutting device which is rotatably supported by the device body 2 so that the rotary cutting blade 5 can be moved between the cutting position and the standby position. A rotary cutting device, characterized in that it is provided with a moving means (20) for reciprocating in a direction away from or approaching the supporting portion. 2. When the support body 3 is moved so that the rotary cutting blade 5 is at the cutting position, there is provided a hooking means 29 for hooking the support body 3 on the apparatus main body 2 and the moving means 20.
2. The rotary cutting device according to claim 1, further comprising release means 32 for releasing the engagement by the engagement means 29 when the rotation drive means 4 is moved to the preset cutting end position by the. 3. A load detecting means 55 for detecting a load value of the rotation driving means 4, and a load control means 59 for controlling a moving speed of the moving means 20 so that a load amount by the load detecting means 55 does not exceed a predetermined value. The rotary cutting device according to claim 2, further comprising: