JPH0741600B2 - Heat wire automatic cutter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is intended to process a small block having a size suitable for a packing block for various industrial products, a heat insulating block, etc., from a coarse large block of a resin foam such as Styrofoam. , A hot wire automatic cutter device used for fusing of the rough block.

(Prior Art) Conventionally, such a resin foam block has been fused by cutting a nichrome wire having a diameter of about 0.5 mm between two shafts having a large number of grooves which are erected on the left and right sides of the upper surface of the base. Using the installed device,
After energizing the nichrome wire, the rough block of the resin foam was supported and pushed by hand and fed between the two shafts, and the nichrome wire was used for fusion cutting.

However, this conventional cutter device is a completely manual device, and it is necessary to manually stretch each nichrome wire while measuring the line spacing with a caliper, and the work for that purpose is a resin foam block. It took several times as long as the fusing time of itself, and the workability was extremely poor. Also, the dimensional accuracy after fusing was extremely poor.

Therefore, the present inventors have filed Japanese Patent Application No. 61-262314 and Japanese Patent Application No. 61-262314.
As shown in 196982, etc., we have already proposed an automatic hot wire cutter that has an automatic heating wire (nichrome wire) height change mechanism, an automatic resin foam block feed mechanism, etc. ing.

These proposed devices can automatically stretch each heating wire to an appropriate height according to the lot, so that the workability of fusion cutting of the resin foam block can be greatly improved, and the obtained block product The dimensional accuracy of can be greatly improved.

(Problems to be solved by the invention) However, the above-mentioned proposed hot wire automatic cutter device has a numerical control mechanism including a ball screw or the like as a mechanism for moving the heating wire (heat wire) itself or a member supporting the heating wire up and down. When using, the mechanism for putting in and out the claws of the ball screw part and sandwiching and engaging with the holder becomes complicated, and it is necessary to increase the number of drive motors each time the number of heating wires to be stretched is increased. However, there is a problem that the size of the device is increased and the product price is significantly increased.
Further, since all the heating wires (stretching members) operate in the same manner in cooperation with the drive motor, only product blocks having the same thickness can be processed.

Further, the above-mentioned proposed automatic heating wire cutter has a structure in which all the heating wires stretched from the left and right electrode rods are simultaneously energized, so even the heating wires that are not actually used for fusing during processing are energized. However, it has a drawback of large energization loss, which is a problem in terms of operating cost.

The present invention has been made in consideration of the above situation,
The purpose of this heating wire is to be able to accurately and automatically cut the resin foam block into various desired thicknesses, significantly simplify the structure of the device, especially the drive mechanism, and greatly reduce the product cost and the operating cost. It is to provide an automatic cutter device.

(Means for Solving the Problems) The hot wire automatic cutter device of the present invention has a structure in which the heating wire is clamped or held by a sandwiching member and the height of the heating wire can be arbitrarily changed by a drive motor, particularly a servomotor. The electrode part is provided with an insulating part that cannot energize the heating wire.

That is, in the device of the present invention, a pair of electrode rods and a pair of columns are erected on both left and right sides of the upper surface of the base, and a predetermined number of thin heating wires are hung on the left and right electrode rods, respectively. A predetermined number of left and right tension supports attached to the column so as to be movable up and down and tensioned by tension means, and further provided with a sandwiching member and a drive motor, which sandwiches the heating wire and the stretching support. The heating wire height changing mechanism that moves the tool closer to and away from it and moves up and down while holding or holding them is installed on both left and right sides of the base, and the electrode rod is divided into a conductive part and an insulating part. A control device configured to operate the heating wire height changing mechanism and sequentially move a required number of heating wires waiting in the insulating portion of the electrode rod to a desired position of the conductive portion and then return to the original position. Be equipped with It is to be characterized and.

The cutter device of the present invention is usually an electrode rod, a pillar, a tension support,
The tension means, the sandwiching member, the drive motor, the heating wire height changing mechanism, and the like are provided in left and right pairs, and it is preferable that the left and right members or devices are operated in cooperation with each other.

As the heating wire, a small-diameter metal wire called a heat wire, usually, for example, a nichrome wire rod of 0.48 mmφ to 0.32 mmφ is used.

The electrode rod of the present invention is divided into a conductive portion and an insulating portion. The conductive portion is a portion that is energized by a power source through electric wiring connected to the electrode rod, and has a large number of horizontally extending narrow grooves formed vertically and continuously, for example, at a pitch of 0.5 mm to 1.0 mm. Then, the heating wire can be applied. The insulating portion is a portion that is not energized, and is made of, for example, an insulating material such as ceramics or has an insulating layer formed on the surface of the electrode rod. The insulating portion is usually provided above or below the electrode rod.

The column is made of a metal rod, such as a stainless rod, to which a predetermined number of tension braces are attached so as to be vertically movable. The tension support is made of a member, such as a synthetic resin plate, which is connected to both ends of the heating wire via tension means. The tension means is made of, for example, a coil spring or a rubber material, and preferably has a function of always keeping the tension applied to the heating wire constant. Therefore, in the present invention, each heating wire is
It is hung on the left and right electrode rods and is horizontally stretched between the tension support members of the left and right columns.

Electrode rods and stanchions are tilted slightly toward the resin foam to be treated to eliminate the step difference in cut thickness due to bending of heating wires, etc., and are erected at an angle of 80 ° to less than 90 ° with respect to the horizontal Is preferred.

The heating wire height changing mechanism is provided on each of the left and right sides of the base, and the one sandwiching member is preferably one that can sandwich or suspend the heating wire and the tension support together. Good. An air cylinder device or a solenoid device, for example, may be provided in order to bring the sandwiching member closer to or away from the heating wire and the tension support. Similarly, the drive motor of the component is, for example, a servo motor,
One is provided on each of the left and right sides of the base, and is used, for example, to vertically move the sandwiching member, the air cylinder device, and the like.

Further, the control device is composed of a sequencer, a computer, etc. which are programmed to perform the above-mentioned functions.

Utilizing the present invention, a device having a structure similar to that described above and having a configuration in which a heating wire is stretched vertically and is moved in the left-right direction by a sandwiching member, a drive motor, or the like may be used.

The device of the present invention further comprises a rail laid on the upper surface of the base,
It is preferable to provide a movable table on which the resin foam block is placed so as to be movable along the rail, and it is more preferable that the movable table is provided with a fixture for suppressing the displacement movement of the block.

(Operation) In the device of the present invention, all the heating wires are stretched at the position of the insulating portion of the electrode rod when not in operation. Then, during operation, the required number of heating wires standing by in the insulating part of the electrode rod are sequentially moved to the desired position of the conductive part and horizontally by operating the heating wire height changing mechanism and the control device. After the wire is kept tight and the heating wire is energized via the electrode rod, the resin foam block passes between the left and right electrode rods and is fused. In the present invention, since the height of the heating wire is changed by a mechanism including a pair of left and right drive motors, the mechanism is simple, and a required number of heating wires are transferred to the control device (computer). Since the heating wires can be stretched and arranged so that the heating wire spacing can be varied in accordance with the input data, the product blocks of various thicknesses can be simultaneously fused and cut from one coarse resin foam block.

Further, in the device of the present invention, the electrode rod is divided into a conductive part and an insulating part, and therefore, by heating a heating wire that is not used during operation at the position of the insulating part, they are not energized. Therefore, there is no electrical loss.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

As shown in FIG. 1 and FIG. 2, the hot-wire automatic cutter device of the embodiment is provided on both right and left sides of the inclined upper surface of the base 10.
Two electrode rods 2, 2 and two stainless steel columns 3, 3 are erected on the outside thereof, and a predetermined number of tension support members 9 ... It is vertically movable (in the direction of the arrow Y), and a predetermined number of heating wires consisting of 0.32 mmφ nichrome wire are hung on the left and right electrode rods 2,2, and between the left and right tension supports 9,9. Each of them is horizontally stretched via a coil spring 6 of a tension means.

The electrode rod 2 is composed of an upper insulating portion 4 and a lower conductive portion 5. The insulating portion 4 is formed by coating an insulating material layer, and the conductive portion 5 is formed by engraving a large number of horizontal grooves vertically at a pitch of 0.5 mm.

Further, the apparatus of the embodiment is equipped with a heating wire height changing mechanism as shown in FIG. 3 on both left and right sides of the base 10, and a control device is connected to the mechanism. The changing mechanism is the pinching member 19
An air cylinder 8 which is connected to the member 19 and moves in the horizontal direction (arrows ± X direction) so as to approach and separate the heating wire 1 and the tension support 9, and a blanket to which the air cylinder 8 is fixed. It is composed of a servo motor 7 which moves 11 up and down (direction of arrow Y in FIG. 1). Further, the sandwiching member 19 has a hook 14 (fourth hook) for hooking the heating wire 1 at one end thereof.
(Fig.), And the clamping claw 15 for clamping the tension support 9 at the other end
(FIG. 5). The operation of the servo motor 7 is electrically controlled by an electric signal p from a sequencer 12 of the control device, and the operation of the air cylinder 8 is pneumatically controlled by an air signal q from the sequencer 12. The sequencer 12 is connected to the computer 13 and operates the air cylinder 8 to hold the heating wire 1 by the holding member 19 so as to hold the tension support 9 based on the arithmetic function and the input data to the computer 13. The servo motor 7 works to move them up and down as they are, and the insulating portion 4 of the electrode rod 2 is moved.
A series of controls (details will be described below) are performed by sequentially moving the heating wire 1 located at 1 to the desired position of the conductive portion 5 and then returning to the original position of the insulating portion 4.

Further, the apparatus of the embodiment has a rail 17 as shown in FIG.
Is laid on the inclined upper surface of the base 10, and a movable table 16 is movably provided on the rail 17 via a roll bearing 18 so as to pass between the left and right electrode rods 2, 2. The moving base 16 can be fixed by mounting a rough block F of resin foam, and by a driving device (not shown), it cooperates with the above control device so as to pass between the left and right electrode rods 2, 2 in a timely manner. It is configured.

Next, a method of using this device will be described.

Initially, all the heating wires 1 ... Are set so as to be located in the insulating portion 4 of the electrode rod 2.

First, necessary data, for example, the dimensions (width, height) of the rough block F of the resin foam, the margin of the unused block portion, the diameter of the heating wire 1 and the size of the melt according to the current value to be applied. , And the desired product block thickness and number, etc. are input to the computer 13. The computer 13 calculates the required number of heating wires and the height at which each heating wire should be stretched based on these input data.

According to the calculation result of the computer 13, the sequencer 12 first sends the air control signal q to the air cylinder 8 and operates it in the arrow + X direction to hold the heating wire 1 by the sandwiching member 19 as shown in FIG. Then, the tension support 9 is clamped by the same member 19 as shown in FIG. 5, and subsequently, an electric control signal p is sent to the servomotor 7 to operate the servomotor 7 to move the clamp member 19 to the heating wire 1 and the tension wire 1. With the support 9 held, it is moved up and down together with the air cylinder 8 (arrow Y direction), and then the air cylinder 8 is operated in the direction opposite to the up and down direction (arrow -X direction) to generate the heating wire 1.
Is hung on the electrode rods 2, 2 and the heating wire 1 is stretched horizontally at the calculated position of the conductive portion 5. The extension of the heating wires 1 ... Is sequentially performed by the action of the sequencer 12 and the like. After the tensioning is completed, the required number of heating wires 1 ... Is energized through the conductive portion 5.

Then, by operating the moving table 16, the rough block F is passed between the left and right electrode rods 2 and melted by the heating wire 1 stretched to process a block product having a desired thickness.

After the fusing is completed, the sequencer 12 operates the servomotor 7, the air cylinder 8 and the like to stretch the heating wire 1
.. are returned to the original position of the insulating part 4 one by one.

In the cutter device of the embodiment, each heating wire can be stretched between the left and right electrode rods so that the mutual wire spacing varies depending on the input data to the computer 13, and thus various thicknesses can be set. It was possible to obtain the resin foam block product at the same time and with high accuracy by one-time fusion cutting. In addition, the apparatus of the present invention needs to flow current only for the number of heating wires actually used for fusing, which can significantly reduce the amount of electricity required for processing, and the life of the heating wires is significantly longer than that of the conventional device. became.

(Effects of the Invention) As described above, the hot wire automatic cutter device of the present invention can accurately and sequentially stretch a plurality of heating wires at various wire intervals by the functions of the sandwiching member, the drive motor, and the like.
Therefore, the product blocks of various thicknesses can be simultaneously subjected to the fusion cutting, and the thickness accuracy of the obtained block products becomes very high. Moreover, since a pair of left and right drive motors and the like are sufficient as a mechanism for arbitrarily changing the height of the heating wire, the mechanism and the entire device can be greatly simplified and downsized. Furthermore, the workability of fusing processing is markedly improved by such automation, and therefore, it can be satisfactorily adapted to high-mix low-volume production.

Further, in the cutter device of the present invention, a required number of heating wires are stretched at the position of the conductive portion of the electrode rod to be energized during processing, while unused heating wires are stretched at the position of the insulating portion of the electrode rod. Since it is possible to prevent the energization, it is possible to significantly reduce the energization loss, which is extremely advantageous in terms of operating cost (electricity charge).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are a front view and a side view showing a hot wire automatic cutter device according to an embodiment of the present invention, and FIG. 3 is a heat wire automatic shown in FIG. 1 and FIG. FIGS. 4 and 5 show a heating wire height changing mechanism in the cutter device, and FIGS. 4 and 5 show a heating wire holding process and a tensioning process using the sandwiching member in the heating wire automatic cutter device of FIGS. 1 and 2. It is a figure which respectively shows the clamping process of a tool. In the figure, 1 ... Heating wire 2 ... Electrode rod 3 ... Strut 4 ... Insulation part 5 ... Electrode part 6 ... Spring 7 ... Servo motor (drive motor) 8 ... Air cylinder 9 ... Stretching support Tool 10 …… Base 11 …… Blanket 12 …… Sequencer 13 …… Computer 14 …… Hooking claw 15 …… Clamping claw 16 …… Movement stand 17 …… Rail 18 …… Roll bearing 19 …… Clamping member F… … Resin foam block ± X …… Movement direction of sandwiching member Y …… Movement direction of heating wire A …… Movement direction of resin foam block p …… Electrical control signal q …… Air control signal

Claims (1)

[Claims] 1. A pair of electrode rods and a pair of columns are erected on both left and right sides of an upper surface of a base, and a predetermined number of small-diameter heating wires are hung on the left and right electrode rods, respectively. A predetermined number of left and right tension braces that are movably attached are tensioned via tensioning means, and a sandwiching member and a drive motor are provided, and the sandwiching member is attached to the heating wire and the bracing fixture. A heating wire height changing mechanism that moves close to and away from each other and moves up and down while sandwiching or holding them is provided on each of the left and right sides of the base, and the electrode rod is divided into a conductive portion and an insulating portion. Along with this, a control device for operating the heating wire height changing mechanism and sequentially moving a required number of heating wires waiting in the insulating portion of the electrode rod to a desired position of the conductive portion and then returning to the original position is provided. It is characterized by Hot wire automatic cutter device that.