JPH081062A - Device for injecting hot-melt resin material - Google Patents

Abstract

PURPOSE:To surely supply a thermoplastic resin material to a melting chamber and to prevent the clogging of the material at the chamber inlet from occurring. CONSTITUTION:This device is provided with a thermoplastic resin cable material 3 wound on a reel 2, etc., a couple of feed rollers 6 and 7 with an insertion gap having a width smaller than the outer diameter of the cable material and having plural teeth 21 to be bitten into the cable material on its periphery, a motor 8 for driving the feed rollers capable of being rotated in the forward and reverse directions and a hot melt gun 11 to melt the cable material. The pipes 9 and 10 of a low-heat-conductivity material connected to the gun and used to introduce the cable material 3 from the feed rollers 6 and 7 into the gun 11 are also formed, and further a means 12 to cool the pipes 9 and 10 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot melt resin material injection device for supplying a thermoplastic resin material to a melting chamber to insulate a wire connecting portion with the molten resin material.

[0002]

2. Description of the Related Art FIG. 7 shows an apparatus for injecting a hot melt resin material described in JP-A-57-159572. This device 41 includes a large melting tank 43 provided inside a housing 42, a heater 44 for heating the melting tank 43, a pump 45 communicating with the tank 43, and a gas source 46 connected to the pump 45. And a discharge gun 49 connected from the pump 45 through a filter 47 and a hose 48.

A solid hot melt (thermoplastic) resin material is charged into the tank 43, and the resin material melted by the heater 44 is mixed with a gas in a pump 45 and is sent to a discharge gun 49 by the pressure of this gas. . Then, the operator operates the trigger 50 of the discharge gun 49 to discharge the molten resin material.

However, in the above-mentioned conventional apparatus 41, if the resin material is left in the tank 43 for a long period of time, the resin material will be humidified. It is not suitable for a certain process, and the device 41 itself has a large size and a complicated structure, which causes a problem of high cost.

On the other hand, FIG. 8 shows an apparatus for injecting a hot-melt resin material, which is described in Japanese Patent Application Laid-Open No. 1-123659. This device 51 includes a rod-shaped hot-melt resin material 53 that is loaded into the gun body 52 from the rear, a pair of endless supply belts 54 that are installed facing each other on both sides of the resin material 53, and a gear 55. Motor 56 for driving the belt 54 and the rod-shaped resin material 5 in the middle of the gun body 52.
And a melting chamber 59 located forward from the sleeve 57 through a narrow introduction portion 58.
And a tip nozzle 60 following the melting chamber 59.

Then, the motor 56 is rotated by the operation of the trigger 61 to drive the belt 54, the rod-shaped resin material 53 is sent into the melting chamber 59 by the belt 54, and the melted resin material is discharged from the nozzle 60. .

The apparatus 51 is small, has a simple structure, is inexpensive, and is suitable for a process in which the amount of the resin material 53 used is small. However, as the amount of the resin material 53 increases, the setup for loading the resin material 53 is performed. The problem that it requires a lot of work and is troublesome,
When trying to obtain more molten resin material, the motor 5
When the rotation of 6 is increased, there is a problem that slippage occurs between the belt 54 and the resin material 53 and the increase in production cannot be dealt with. There is also a problem that the resin material 53 in the introduction portion 58 and the sleeve 57 is melted (back-melted) by the heat in the melting chamber 59 to be solidified, and the material is likely to be clogged.

[0008]

SUMMARY OF THE INVENTION In view of the above points, the present invention continuously discharges a large amount of molten resin material without increasing the size of the apparatus and without changing the setup of the hot melt resin material. In addition, it is possible to reliably feed the resin material into the melting chamber to increase the discharge rate in response to high-speed operation, and to cope with fluctuations in the usage frequency (load fluctuations) of the device. An object of the present invention is to provide a hot-melt resin material injection device capable of preventing solidification of the molten resin material inside to prevent material clogging.

[0009]

In order to achieve the above object, the present invention provides a thermoplastic resin cable material wound around a reel or the like and an insertion gap narrower than the outer diameter of the resin cable material. A pair of feed rollers having a plurality of engaging teeth for the resin cable material on the outer periphery, a forward / reverse reversible motor for driving the pair of feed rollers, and a hot melt gun for melting the resin cable material. It is based on a hot melt resin material injection device. A structure provided with an introduction pipe of a low thermal conductive material that is connected to the hot melt gun and guides the resin cable material from the feed roller to the hot melt gun, and a structure provided with a cooling means for the introduction pipe are also effective.

[0010]

The pair of feed rollers forcibly feed the resin cable material toward the hot melt gun by the biting teeth thereof.
Since the biting teeth bite into the resin cable material, the resin cable material does not slip even when the rotation speed of the feed roller is increased, and the resin cable material is reliably fed to the hot melt gun.

Further, the pipe made of a low thermal conductive material blocks heat transfer from the hot melt gun to prevent the resin cable material from melting (backmelting) in the pipe. This prevents material clogging in the pipe. Cooling means for the pipe further aids its action. When the device is not in use, reverse the motor to rewind the resin cable material to the reel,
The reel can be stored in a low humidity room etc.

[0012]

1 and 2 show an embodiment of an apparatus for injecting a hot melt resin material according to the present invention. This pouring device 1 includes a thermoplastic hot-melt resin cable material 3 having a circular cross section wound on a reel 2, a pair of upper and lower insertion guides 4 and 5 for guiding the resin cable material 3, and a pair of insertion guides 4. , 5, a pair of left and right feed rollers 6, 7 that feed the resin cable material 3 and the feed rollers 6, 7 via the synchronous gears 19, 20 in opposite directions (for example, a,
A motor 8 for driving in a lower direction), a guide pipe 9 made of Teflon (registered trademark of DuPont, USA) connected to the lower insertion guide 5, and an introduction pipe 10 made of Teflon connected to the guide pipe 9. A hot melt gun 11 as a heating and injection unit connected to the introduction pipe 10 and a cooling air nozzle 12 as cooling means for the guide pipe 9 and the introduction pipe 10 are provided.

The reel 2 is rotatably set by inserting a center hole 2a into a horizontal support shaft 15 of a column 14 standing upright on the side wall 13 of the body frame, and attached to and detached from the horizontal support shaft 15. You are free. The hot-melt resin cable material 3 wound around the reel 2 is preferably made of a flexible material such as polyamide resin.

The resin cable material 3 hanging from the reel 2 in the tangential direction passes through the upper insertion guide 4 and is guided from the lower insertion guide 5 to the Teflon-made guide pipe 9.
Each of the insertion guides 4 and 5 is fixed to the front wall 16 of the body frame, has a substantially block shape, and has a cable insertion hole 1 at the center.
7 and has inclined notch escape portions 18 with respect to the pair of feed rollers 6 and 7 on both the lower end side and the upper end side.

On the front wall 16, a pair of substantially gear-shaped feed rollers 6 and 7 are arranged on both sides of the resin cable material 3 between the pair of insertion guides 4 and 5. The insertion gap S between the pair of feed rollers 6 and 7 is set smaller than the outer diameter dimension D of the resin cable material 3 as shown in FIG. A plurality of engaging teeth 21 in a direction orthogonal to the resin cable material 3 are formed in parallel on the outer peripheral portion of each of the feed rollers 6 and 7. The biting tooth 21 has a sharp tip 21a and can bite into the resin cable material 3 to forcibly feed or rewind the cable material 3.

As another example of the biting teeth 21, there are teeth 2
The tip of 1 has a little flat part like a gear,
Alternatively, the tips of the teeth 21 may have a slightly rounded shape. The point is that the tip ends of the teeth 21 bite into the resin cable material 3 and the cable material 3 can be forcibly transferred. The flexible resin cable material 3 may be provided with a slightly flat or rounded tip shape instead of the sharp tip 21a.

The feed rollers 6 and 7 are fixed to the tips of the rotary shafts 22 and 23, and the rotary shafts 22 and 23 are supported by the front wall 16 and extend rearward, and an intermediate wall 24 parallel to the front wall 16. Gears 1 that mesh with each other
9 and 20, one rotary shaft 22 is connected to the drive motor 8 fixed to the rear side of the intermediate wall 24. The drive motor 8 is capable of normal rotation and reverse rotation, and as described above, it is possible to send out and rewind the resin cable material 3. When the apparatus 1 is not used, the feed rollers 6 and 7 are reversed to rewind the cable material 3 onto the reel 2 and the reel 2
It can be stored in a dehumidifying room. The motor 8 is automatically controlled by an external signal and can drive the feed rollers 6 and 7 to automatically feed the resin cable material 3.

The front wall 16 and the intermediate wall 24 are fixed between the side walls 13 and 13, and the lower portions of the side walls 13 and 13 are fixed to the base plate 25. Further, in front of the front wall 16, the feed rollers 6, 7 are provided between the side walls 13, 13.
Is provided with a transparent acrylic protective cover 26.

The resin cable material 3 sent out by the pair of feed rollers 6 and 7 inside the protective cover 26 passes through the lower insertion guide 5 and is fed into the guide pipe 9 and the introduction pipe 10 below it. . The guide pipe 9 and the introduction pipe 10 are made of Teflon having a low thermal conductivity. Other than Teflon, the material of the pipes 9 and 10 has a low thermal conductivity and preferably has a low sliding resistance. For example, ceramics or glass fiber reinforced plastics can be used.

As shown in FIG. 2, the upper end 9a of the guide pipe 9 is inserted and fixed in the lower insertion guide 5, and the guide pipe 9
The lower end 9b of the guide pipe 9 is inserted and fixed to the enlarged diameter portion 10a on the inside of the introduction pipe 10 having an outer diameter slightly larger than that of the guide pipe 9. The inner diameter portions 9c, 10c of the pipes 9, 10 are set to have the same dimensions, and the resin cable material 3 can be smoothly inserted into the inner diameter portions 9c, 10c.

In the present embodiment, the guide pipe 9 extends slightly obliquely forward in the connecting portion 9d with the insertion guide 5 and smoothly extends, and the introduction pipe 10 has its lower end 10b connected straight to the guide pipe 9. Hot melt gun 11
Connected to. The introduction pipe 10 has a diameter larger than that of the guide pipe 9 in order to diffuse the heat transfer from the hot melt gun 11 and to improve the cooling efficiency.
It is also possible to integrally form the guide pipe 9 and the introduction pipe 10 with a low heat conductive material such as Teflon.

Further, the guide pipe 9 and the introduction pipe 10
An air nozzle 12 for cooling is arranged in the vicinity of a connecting portion with and so as to face it. The air nozzle 12 penetrates through the acrylic protective cover 26 and is attached to a pedestal 27 fixed to the protective cover 26. The air nozzle 12 can uniformly blow air on both pipes 9 and 10. An air supply hose 28 is connected to the air nozzle 12. The guide pipe 9 and the introduction pipe 10 made of a low heat conductive material prevent the resin cable material 3 from being melted (backmelted) in the pipes 9 and 10 (in particular, the introduction pipe 10), and the effect is further promoted by the cooling by the air nozzle 12. To be done.

The hot melt gun 11 is fixed to the front wall 16 and has an introducing passage 29 continuing to the introducing pipe 10, a melting chamber 30 continuing to the introducing passage 29, and the melting chamber 30.
(Not shown) for heating the melting chamber 30 and a gun nozzle 31 following the melting chamber 30. The gun nozzle 31 has a spring 31a and a ball valve 31b that is pressed by the spring 31a to close the outlet, and the pressure of the melting chamber 30 opens and closes the ball valve 31b.

Then, the molten resin material is discharged from the gun nozzle 31. In this example, as shown in FIG. 1, the conveyor belt 32 is arranged on the base plate 25, and the mold 33 on the conveyor belt 32 is filled with the molten resin. The mold 33 is shown in FIG.
The intermediate connection part 36 of the electric wires 34 and 35 is set as shown in
As shown in FIG. 5, the molten resin 3 is put into the mold 33 from the gun nozzle 31.
7 is discharged and filled, and the resin member 3 is cooled and solidified as shown in FIG.
The connecting portion 36 is insulated and protected by 7 '.

Although the resin cable material 3 is wound around the reel 2 in the above embodiment, the shape of the reel 2 is not specified as long as the resin cable can be wound around it, and various shapes such as bobbins and drums can be used. Can be used.

[0026]

As described above, according to the present invention, since the biting teeth of the feed roller forcibly feed the resin cable material, the resin cable material is reliably supplied to the hot melt gun even at high speed operation. Therefore, a large amount of molten resin material can be obtained. Therefore, it is possible to cope with mass production without using a conventional large-sized injection device. In addition, since the reel-type resin cable material is used, it is possible to save the trouble of changing the resin material as in the conventional case and improve the productivity. Further, when the device is used, the motor is reversed to rewind the resin cable material to the reel, and the reel can be stored in a low humidity chamber or the like, and it is possible to sufficiently cope with fluctuations in the usage frequency of the device (load fluctuations).

Further, by melting the resin cable material into the hot melt gun by using a low heat conductive material or by providing a cooling means therefor, it is possible to prevent the resin cable material from being melted (backmelted) in the introduction pipe. The material clogging in the introduction pipe is eliminated, and smooth material supply is always possible.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a hot melt resin material injection device according to the present invention.

FIG. 2 is a side view of the same with a partly cutaway section.

FIG. 3 is a front view showing an operation of a feed roller.

FIG. 4 is an exploded perspective view showing a state in which an electric wire connecting portion is set in a mold for injecting resin.

FIG. 5 is a perspective view of a state in which resin is also injected from the gun nozzle.

FIG. 6 is an exploded perspective view showing a state in which a connection portion is insulated with a resin material.

FIG. 7 is a perspective view showing a conventional example.

FIG. 8 is a cutaway side view of an essential part showing another conventional example.

[Explanation of symbols]

 1 Device 2 Reel 3 Resin Cable Material 6, 7 Feed Roller 8 Motor 9 Guide Pipe 10 Introduction Pipe 11 Hot Melt Gun 12 Cooling Air Nozzle 21 Bite Teeth S Insertion Gap

Claims (3)

[Claims] 1. A thermoplastic resin cable material wound around a reel or the like and an insertion gap narrower than the outer diameter of the resin cable material, and a plurality of engaging teeth for the resin cable material are provided on the outer circumference. An apparatus for injecting a hot-melt resin material, comprising: a pair of feed rollers having the same; a motor capable of rotating in the forward and reverse directions for driving the pair of feed rollers; and a hot-melt gun for melting the resin cable material. 2. The hot melt resin material according to claim 1, further comprising a pipe of a low heat conductive material which is connected to the hot melt gun and guides the resin cable material from the feed roller to the hot melt gun. Injection device. 3. The hot melt resin material injection device according to claim 2, further comprising cooling means for the pipe.