JPH0725080B2 - Guide board carrier of automatic heat wire cutting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is used for fusing cutting of a work piece, mainly a coarse block such as expanded polystyrene, into a size for various applications by contact with a heating wire. Related to the automatic heat wire cutting machine used, more specifically, in the automatic heat wire cutting machine, a guide table for placing a workpiece is transported so as to pass between two electrodes on which a heating wire is stretched. The present invention relates to a guideway carrier device.

(Prior Art) Recently, various automatic heat ray cutting machines have come to be used for automatically cutting from a styrofoam coarse block to a small block having a size suitable for a packing block or the like.

This automatic heat wire cutting machine generally has a structure in which, in order to ensure stable transportation, the styrofoam block is carried while being carried on a guide table, and in the process thereof, it is fused by a heating wire.

And as such a guide table carrying device, or as a mechanism, it is assumed that the moving surface of the guide table is inclined at an angle of 4 to 13 °, and the guide table on which the workpiece is placed is along the moving surface. Of a structure that moves from a high place to a low place by their own weight, equipped with a roller conveyor, and a mechanism that conveys the guide table along the roller surface, usually horizontally, by a power moor drive, and a chain drive or belt conveyor There is a mechanism in which the guide is normally slid on the rail by driving (Japanese Patent Application No. 61-262314,
See Japanese Patent Application No. 61-196982 and Japanese Patent Application No. 62-127759).

However, so to speak, the former one of the gravity transportation method is difficult to divide into many small blocks at the same time, and in addition, after each fusing process, the guide table that has moved to a low place is pulled up to a high place again. Since it is necessary to perform a troublesome work, it is significantly inferior in terms of workability and processing efficiency to the latter two, which are forcibly transported by driving force, and from this point, mass production is performed. It is not suitable for fusing of styrofoam blocks.

(Problems to be Solved by the Invention) However, in the case of a compulsory transport mechanism such as the latter two, it is conventionally about a few on the surface melted by the heating wire.
There is a tendency that unevenness with a height of mm is generated, and a wavy pattern appears in many cases (hereinafter referred to as a corrugation phenomenon), and there is a problem that the Styrofoam block cannot be melted and cut smoothly. .

For example, in the case of a transporter driven by a power moller equipped with a roller conveyor, 21 nichrome wires with a diameter of 0.32 mm are stretched, and in an automatic heat wire cutting machine that fuses by energizing the electrodes after voltage conversion with a 100 V power source, Coro conveyor pitch 10 cm
As a result, the fusing surface became a rough surface with unevenness of 3 mm or more, and a wavy pattern with a depth of about 2 mm also appeared partially. In particular,
The wavy phenomenon occurred more often when the styrofoam block having a relatively high water content was cut.

Further, in the case of the guide carriage carrying device driven by a chain, the waviness phenomenon was less likely to occur as much as the device provided with the drive sprocket wheel having a smaller number of teeth. Further, it was confirmed that even if the rotation speed of the wheel was changed variously, there was no effect in preventing the occurrence of the waving phenomenon.

The above-mentioned waviness phenomenon is considered to occur due to the following reasons. Due to the difference in internal density of styrofoam blocks, the variation in weight, and the uneven distribution of parts with a high or low water content, the resistance applied to the heating wire during fusing is usually not uniform, and there is a considerable difference between the small parts of the block. There is. In spite of this, in the guide platform transporting device driven by a power moleer or a chain drive, since the guide platform is forcibly transported, such a resistance difference is not relaxed, so that the heating wire has a smaller resistance (a water content of The block is melted by vertically displacing to the smaller side), resulting in unevenness on the fusing surface.

Therefore, if this is the cause, for example, the magnitude of the resistance applied to each part of the heating wire during fusing processing is detected by an appropriate sensor, and the resistance is always constant based on the detected value. By finely controlling the transportation speed of the, the waving phenomenon of the fusing surface will not occur.

However, the equipment for carrying out this method requires complex and expensive elements, such as special control circuits, especially as the number of heating wires becomes more complex and more expensive. Therefore, it cannot be adopted immediately.

The present invention has been made in consideration of the circumstances described above, and an object of the present invention is to cut a work piece such as a Styrofoam block by fusing by driving force to cut the cut surface. It is an object of the present invention to provide a guide board carrier for an automatic heat ray cutting machine, which can always obtain a stable and smooth surface without causing a waving phenomenon.

(Means for Solving the Problem) According to the present invention, one means for solving the above problem is to melt and cut the work piece by a stretched heating wire in a guide bar of the work piece in an automatic heat wire cutting machine. In a guide platform transporting device for transporting the guide platform, a guide platform is provided so as to be slidable horizontally, and a roller contact surface is provided horizontally on the lower surface of the guide platform in the sliding direction of the platform, and the lower side of the guide platform. In, the rubber roller is attached to the rotary shaft of the drive motor so as to be in sliding contact with the roller contact surface, and the rotary shaft is displaced vertically to change the transmission torque from the rubber roller to the roller contact surface. And a torque adjusting means for controlling the guide wire of the automatic heat wire cutting machine.

In the present invention, the automatic heat ray cutting machine may be the same as the conventional one except for the guide rail carrying device. That is, the present invention can be applied to an apparatus that normally includes more than 10 heating wires, two electrodes, and stretching means.

The guide board is slidably provided on a horizontal rail, for example,
In addition, a horizontal and preferably smooth roller contact surface is formed on the lower surface in the sliding direction of the table.

On the other hand, a drive motor is arranged below the guide table, and a rubber roller is attached to the rotation shaft of the drive motor so as to come into contact with the roller contact surface.

Therefore, the driving force of the motor is transmitted from the rotating shaft to the guide through the rubber roller. Therefore, the guide table can be transported horizontally.

In the present invention, in particular, the rubber roller is in contact with the roller contact surface of the guide so as to be able to slip, so when the horizontally moving guide is applied with a certain resistance or more, it slips and the torque of the rotating shaft is reduced. It will not be transmitted to the guide.

Further, the device of the present invention is provided with means for vertically displacing the rotary shaft of the drive motor so that the transmission torque from the rubber roller to the roller contact surface can be appropriately changed. Therefore, when the rubber roller starts slipping and slipping, the amount of resistance applied to the guide can be adjusted. It is more preferable that such torque adjusting means be capable of finely adjusting the vertical displacement of the rotary shaft with higher accuracy.

Another problem solving means according to the present invention is, in the above guide carriage, a mechanism for horizontally transporting the guide by a chain drive, wherein a mounting shaft of a drive sprocket wheel in the chain drive is driven by a drive motor. It is a guide board carrier for an automatic heat wire cutting machine, which is equipped with a torque adjustment brake that can change the torque transmitted to the chain.

In this means, the chain drive mechanism may be any mechanism as long as it conveys the guide table horizontally, and the mechanism, the kind of elements and the like are not limited.

And, a characteristic matter is that the mounting shaft of the drive sprocket wheel is equipped with a torque adjusting brake. Therefore, the torque transmitted from the drive motor to the chain can be changed by adjusting and adjusting the brake.If a resistance force above a certain level is applied to the guide block, the torque transmitted to the chain that will transport the guide block will be changed. Is appropriately reduced or torque transmission is suppressed.

(Operation) According to one of the means of the present invention, the driving force of the motor is transmitted from the rotation shaft of the motor to the guide base via the rubber roller, and the guide base slides horizontally. The styrofoam block of the product is transported and subjected to fusing treatment.

In this case, the drive motor attempts to convey the guide table at a constant speed, but the resistance of the guide table against horizontal movement due to the localization of water inside the block during the melting is excessive beyond a certain amount. When this happens, the rubber roller begins to slip and the torque of the rotating shaft of the motor is no longer transmitted to the guide table, so that the guide table moves at a low speed and sometimes stops. Therefore, the workpiece on the guide table is not forcibly transported despite having an excessive resistance, and is always melt-cut within a proper resistance range. In addition,
The magnitude of the resistance applied to the guide table at the time when the rubber roller starts slipping and slipping can be changed by adjusting the torque adjusting means.

In another means, the driving force of the motor is transmitted to the guide through the chain by the chain drive mechanism,
The guide table moves horizontally, and the workpiece (styrofoam block) on the guide table is transported and used for the fusing treatment.

In this case as well, the drive motor tries to convey the guide table at a constant speed, but when the resistance of the guide table against the horizontal movement during fusing becomes excessive beyond a certain amount,
The braking action reduces or inhibits torque transmission of the motor to the guide, thus causing the guide to move slower or stop. Therefore, the workpiece on the guide table is not transported by force but is transported at variable speed according to the magnitude of the resistance, and is always melt-cut in a proper state.

(Examples) Hereinafter, the present invention will be described in more detail with reference to examples, but the following examples do not limit the present invention in any way.

Example 1 As shown in FIG. 2 and FIG. 3, the automatic heat ray cutting machine of this example has two rod-shaped electrodes 3 and 3 on the left and right sides of the upper surface of the base 9 and two columns on the outside thereof. 4 and 4 are respectively erected, and a predetermined number (21) of heating wires 5 are hung on the left and right electrodes 3 and 3, respectively, and left and right mounted on the support column 4 so as to be vertically movable (direction of arrow Y). It is connected to each of the tension supports 6, 6 via a coil spring 7 and is horizontally stretched.

The electrode 3 has a large number of narrow grooves continuous in the width direction, for example, 0.5 mm to
It is formed with a pitch of 1.0 mm.
It is possible to multiply by.

The heating wire 5 is a metal wire that generates heat when energized, and usually has a diameter of 0.1 mm to 2 mm, such as 0.32 mmφ to 0.
48mmφ nichrome wire is used.

Further, the automatic heat wire cutting machine is said to hold the heating wire 5 by the sandwiching member 8 at the time of processing, lower it along the column 4, carry it to a predetermined position, and set it and then raise it. It is equipped with a heating wire height adjusting mechanism for automatically performing a series of operations.

Further, in the automatic heat ray cutting machine of this example, the plate-shaped guide base 1 on which the styrofoam block 10 is placed is horizontally
It is provided with a guide platform transporting device for transporting through the positions of the extended heating wires 5, 5.

Specifically, the rails 2 and 2 are laid on the upper surface of the base 9, and as shown in FIG. 1, the guide base 1 is horizontally slidable by a roll bearing 11 in the direction of arrow A in FIG. Be prepared. The material of the guide 1 is not particularly limited, but iron, aluminum, ceramics and the like are preferable in terms of robustness and nonflammability. Flame-retardant synthetic resins can also be used.

Further, a roller contact member 14 having excellent wear resistance is attached to the lower surface of the guide 1 in the sliding direction thereof. The roller contact surface 13 on the lower surface of the member 14 is formed as a horizontal surface having an extremely smooth surface.

On the other hand, on the lower side of the guide 1, a drive motor 15 is provided, and a rubber roller 12, 12 is attached to the rotation shaft 16 of the drive motor 15 and a roller contact surface 13
It is mounted so that it can slip and slip freely. The rubber roller 12 had a diameter of 100 mm and a length of 50 mm, and its hardness was 70 with a C type hardness meter.

The motor 15 and the rotating shaft 16 are supported by the structural member 18, and torque adjusting means is provided below the structural member 18.
17 are provided. This means 17 can change the transmission torque from the rubber roller 12 to the roller contact surface 13 by displacing the rotating shaft 16 up and down by the motor 19.

Then, the guide board 1 is actually operated for 7 seconds by the inverter control.
Size 1820 mm × 920 mm while carrying at a moving speed of / 100 mm
A 425 mm styrofoam block 10 was placed on the guide table 1 and melted by energizing 55 AMP.

First, under the condition that the outer peripheral surface of the rubber roll 12 is indented by about 1.0 mm due to contact with the contact surface 13, when the load resistance applied to the guide table 1 in the fusing process becomes 3 kg or more, Since the rubber roller 12 starts to slip and the torque of the rotating shaft of the motor 15 is not transmitted to the guide stand 1, the guide stand 1 moves at a slower speed, and when the load resistance is removed thereafter, the guide stand 1 moves. The transportation speed has returned to the original speed. The surface of the blown product block 10 was very smooth and no waviness was observed.

Next, under the condition that the outer peripheral surface of the rubber roll 12 is indented by about 1.5 mm due to the contact with the contact surface 13, when the load resistance applied to the guide table 1 in the fusing process becomes 5 kg or more. The rubber roller 12 started slipping and thus the guide table 1 moved at a lower speed, and when the load resistance was removed thereafter, the transport speed of the guide table 1 returned to the original speed. The surface of the product block 10 was very smooth, and no waviness was observed.

Further, in the case of the condition that the outer peripheral surface of the rubber roll 12 is indented by about 2.0 mm due to contact with the contact surface 13,
In the fusing process, even if the load resistance applied to the guide board 1 becomes high, the rubber roller 12 does not slip and run completely, and the drive is completely forcibly performed.
The surface of the was not smooth, and unevenness and waviness were observed.

As described above, whether the corrugation phenomenon occurs on the surface of the blown product depends on the material of the rubber roller 12, especially the hardness, the smoothness of the roller contact surface 13, and the contact surface 13 of the roller 12 and the guide 1.
The degree of contact with and the like are closely related. Therefore, it is necessary to set these conditions so as to obtain the most preferable effect. However, once the conditions are set, the fusion cutting can be performed with the same result any number of times thereafter, so there is no disadvantage in terms of workability.

Example 2 The automatic heat ray cutting machine of this example is equipped with a guide carriage as shown in FIGS. 4 and 5. Other configurations are similar to those of the first embodiment.

In these figures, 20 is a chain drive mechanism,
The driving force of 21 is transmitted to the chain 23 via the belt driving mechanism 24, so that the guide base 1 is transported horizontally in the direction of arrow A.

Among such mechanisms, a torque adjusting brake 25 that can change the transmission torque from the drive motor 21 to the chain 23 is attached to the mounting shaft 27 of the drive sprocket wheel 22, and the inside thereof is filled with less wear or the compression strength is adjusted. The attached springs are installed. 26 is an adjusting screw for changing the torque.

Then, when the guide base 1 was transported horizontally by the chain drive mechanism 20 and the styrofoam block 10 thereon was subjected to the fusion cutting process, when the resistance applied to the guide base became excessive during the fusing process, Due to the action of the brake 25, the torque transmission from the motor 21 to the guide table 1 is reduced, and the guide table 1 moves at a lower speed. As a result, the surface of the blown product block 10 was very smooth and no waviness was observed.

(Effects of the Invention) As described above, according to the present invention, in the case where the one means and the other means perform the forced conveyance by the driving force, the workpieces on the guide stand When the resistance applied to the machine becomes too large, it can be transported by deceleration, so it is possible to perform the fusing process within the appropriate resistance range at all times. The effect that a smooth blown product is stably provided can be obtained.

Moreover, the device according to the invention is of very simple construction,
It has the advantage of being inexpensive.

[Brief description of drawings]

FIG. 1 is a front view showing a guide carriage of an automatic heat wire cutting machine according to a first embodiment of the present invention, and FIGS. 2 and 3 show a process for melting styrofoam using the automatic heat wire cutting machine according to the first embodiment. FIG. 4 is a schematic view showing the guide carrier of the second embodiment, and FIG. 5 is an enlarged view showing the mounting portion of the drive sprocket of the carrier of FIG. In the figure, 1 ... Guide 2 ... Rail 3 ... Electrode 5 ... Heating wire 10 ... Workpiece (Styrofoam block) 12 ... Rubber roller 13 ... Roller contact surface 15 ... Drive motor 16 ... Rotation Shaft 17 …… Torque adjustment means 20 …… Chain drive mechanism 21 …… Drive motor 22 …… Drive sprocket wheel 23 …… Chain 25 …… Torque adjustment brake 27 …… Mounting axis

Claims (2)

[Claims] 1. In an automatic heat wire cutting machine, in a guide board carrier device for carrying a work piece so that the work piece is melted by a stretched heating wire, the guide table can be slid horizontally. In order to prepare for the above, a roller contact surface is provided horizontally on the lower surface of the guide table and in the sliding direction of the table, and below the guide table, a rubber roller is used as a rotating shaft of a drive motor to slip and slide with the roller contact surface. The automatic heat ray cutting machine is provided with a torque adjusting means which is mounted so as to be in contact with the rubber roller and further displaces the rotating shaft up and down to change the torque transmitted from the rubber roller to the roller contact surface. Guide platform carrier. 2. In an automatic heat wire cutting machine, in a guide board transporting apparatus for carrying a work piece so that the work piece is melted by a heated heating wire, the guide board is horizontally driven by a chain drive. A guide base for an automatic heat-ray cutting machine, characterized in that the guide shaft of the automatic heat-ray cutting machine is equipped with a torque adjusting brake capable of changing the transmission torque from the drive motor to the chain with respect to the mounting shaft of the drive sprocket wheel in the chain drive. Carrier.