JPS6127721Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packaging film fusing or welding device for welding or fusing a plastic film by generating heat in a film resistor.

Conventionally, in a so-called hand wrapper, a packaging device that wraps food products such as vegetables and meat with a plastic packaging film, a seventh device is used to cut the packaging film to an appropriate length.
It is equipped with a fusing device 71 having the configuration shown in the figure, and an eighth
A welding device 81 shown in the figure is provided. The fusing device 71 shown in FIG. 7 has a configuration in which a heater wire 73 is passed inside a long heater support 72 made of metal. Further, the fusing device 81 shown in FIG. 8 has a configuration in which a heater wire 83 is attached to the back surface of a flat plate-shaped heater support 82.

However, in the fusing device 71 and the welding device 81, the temperature rise time of the heater wires 73 and 83 after energization is slow, so it is necessary to preheat them, resulting in problems such as a large amount of power consumption. Ta. Therefore, recently, it has been considered to use coated resistors such as printed resistors, which have a quick temperature rise, in packaging film fusing devices and welding devices. However, since this film resistor is formed by baking under high temperature conditions, ceramics have conventionally been used as the heater support to which the film resistor is attached. However, members usually made of ceramic are warped or otherwise deformed during the firing process, making it impossible to obtain the desired flat surface, being brittle, making it impossible to obtain large or long pieces, and being expensive. For this reason, it is difficult to use ceramics as a heater support for fusing or welding equipment, and therefore it is difficult to use a film resistor as the heat generating part of fusing or welding equipment. It was also considered difficult to do so.

Therefore, the purpose of the present invention is to solve the above problems,
It is an object of the present invention to provide a packaging film fusing or welding device that enables the use of film resistors and provides various effects.

An embodiment in which the present invention is applied to a handler will be described below with reference to FIGS. 1 to 6.
A main body 1 is disposed at the rear of the upper surface of a base 2, and a cover 3 is pivotally attached to the main body 1 so as to be openable and closable. A concave notch 4 formed at the lower front edge of the cover 3 and a concave notch 5 formed at the front upper edge of the main body 1 form an outlet 6. A guide roller 7 is rotatably disposed in the body 1 at a location close to the outlet 6. As shown in FIG. Behind this guide roller 7, a pair of front and rear brake cylinders 8, 8 are rotatably supported by fixed shafts 9, 9.
A compression coil spring 10 is wound around each end of the brake cylinder 8, and the brake cylinder 8 is held between the brake cylinder 8 by its elastic force.
A film cylinder body 12 is placed between the brake cylinders 8, 8, and is formed into a cylinder shape by winding a long plastic packaging film 11. Said base 2
A movable rod 13 is rotatably disposed in front of the outlet 6 on the top surface, and the movable rod 13 is formed from an operating portion 13a and two leg portions 13b, 13b. . Tension springs 14, 14 are disposed between the legs 13b, 13b of the movable rod 13 and the front surface of the main body 1.
The movable rod 13 is always urged in the direction of arrow 15. The tips of the legs 13b, 13b are connected to the base 2.
It is protruded inward. A micro switch 16 is disposed on the back side of the base 2, and this micro switch 16 is pressed by the tip of the leg 13b of the movable rod 13 when the movable rod 13 is rotated in the direction of arrow 17. It's starting to look like it's being done. A pair of left and right support rods 18, 18 are erected in front of the movable rod 13 on the upper surface of the base 2, and a fusing device 19 is installed between the support rods 18, 18, which is energized and disconnected by a micro switch 16. has been erected.
A hollow platform 2a is provided at the front of the upper surface of the base 2, and a welding device 20 is rotatably disposed on the platform 2a via a rotation arm 20a and a pivot 20b. There is. As shown in FIG. 3, this welding device 20 is biased by a spring 21 so as to rotate upward. An operating rod 22 is disposed on the lower surface of this welding device 20 so as to protrude into the pedestal portion 2a of the base 2, and the tip of the operating rod 22 is connected to the pedestal portion 2a as the welding device 20 rotates. It is designed to come into contact with and separate from an actuator 23a of a micro switch 23 for interlocking the placement provided therein. That is, the operating rod 22
Normally, the actuator 23a of the micro switch 23 is pressed to turn it off, and when the welding device 20 is rotated in the direction of arrow 24 in FIG. 3, the pressing action on the actuator 23a of the micro switch 23 is released. It is designed to be in a switch state.

Now, the fusing device 19 and the welding device 20 will be explained in detail. This fusing device 19 and welding device 20
1 is a fusing or welding device according to the present application, and can be used as a fusing device or a welding device depending on the setting of the heating temperature for the film 11. The fusing device 19 and the welding device 20 are basically composed of the same components. First, the fusing device 19 will be described. As shown in FIG. 4, the fusing device 19 is composed of a heater support 25, an enamel layer 26, a coated resistor 27, a protective layer 28, and a conductive portion 29. The heater support 25 is formed into an elongated metal plate, and a cut portion 25a having a substantially arcuate cross section is formed at the upper end of the elongate so as to extend linearly from side to side. The enamel layer 26 is formed over the entire surface of the heater support 25. This enamel layer 2
No. 6 has excellent heat resistance and electrical insulation, with a particularly high temperature resistance of up to 900°C. The film resistor 27
is made of, for example, a carbon-resin printed resistor, which is attached to the surface of the enamel layer 26 at the cut portion 25a of the heater support 25 by printing and baking. The firing temperature of the film resistor 27 is approximately 800° C., and as can be seen from this, the enamel layer 26 can sufficiently withstand the firing of the film resistor 27. The protective layer 28 is made of electrically insulating ceramic or the like, and is formed on the surface of the enamel layer 26 so as to cover the film resistor 27. This protective layer 28 is preferably thin in order to reduce its heat capacity. The conductive portion 29 passes through the film resistor 27 through the hole 25b formed in the cut portion 25a of the heater support 25.
The film resistor 27 is connected to the electrically conductive portion 29 so that the film resistor 27 is energized.

Next, the welding device 20 will be described. As described above, this welding device 20 basically consists of the same components as the fusing device 19, that is,
As shown in FIGS. 5 and 6, a heater support 30,
It is composed of an enamel layer 31, a film resistor 32, a conductive part 33, and a protective layer 34. The heater support 30 is made of a metal plate, has a rectangular shape, and has a flat surface. The enamel layer 31 is formed over the entire front and back surfaces of the heater support 30, as in the case of the fusing device 19 described above. The film resistor 3
2 are made of the same material as the film resistor 27, and are formed in a dotted manner on the surface of the enamel layer 31 of the heater support 30. The conductive portion 33 for energizing the coated resistor is printed and fired on the surface of the enamel layer 31. The protective layer 34 is formed on the surface of the enamel layer 31 to cover the coated resistor 32 and the conductive portion 33.

In the above configuration, the film 11 pulled out from the film cylinder 12 is pressed against the coated resistor 27 that generates heat in the fusing device 19 and is fused,
After packaging the article, the overlapping portion of the cut sheet film is pressed against and welded to the coated resistor 32 which generates heat in the welding device 20. In this case, since the film resistors 27 and 32 rise in temperature extremely quickly after being energized and are in direct contact with the film, the melting and welding are instantaneous.

According to the fusing or welding device of the present invention, the following effects can be obtained.

(A) Since the heater support is made of metal, it is strong in terms of strength, and it is preferable for the heater support to have a long shape. As for the welding apparatus, it is preferable that the heater support has a certain planar size, and there is no support required to obtain the necessary size, and there are no problems such as warpage. As can be seen, the heater support problems encountered when using film resistors as heaters can be solved.

(B) Forming an enamel layer on the surface of the heater support,
Since the film resistor is fixed to the surface of this enamel layer, even if the film resistor is fixed by firing, the enamel layer, which is the fixed surface, can withstand the firing temperature sufficiently. This, together with the effect described in (A) above, made it possible to practically fix the film resistor to the heater support.

(C) By being able to fix the film resistor to the metal heater support in this way, unlike conventional fusing or welding equipment, it is possible to eliminate residual heat and reduce power consumption. obtain. Further, unlike the case where the heater support is made of ceramic, the cost can be reduced.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention,
Figure 1 is a vertical side view of the entire handler tupper, Figure 2
The figure is a perspective view showing the main parts of the handler.
The figure is a partially cutaway side view of the welding device, FIG. 4 is an enlarged cutaway perspective view of the welding device, FIG. 5 is an enlarged plan view of section A in the welding device, and FIG. 7 is a perspective view showing a conventional fusing device, and FIG. 8 is a perspective view showing a conventional welding device. In the figure, 11 is a film, 19 is a fusing device, and 20
25 is a welding device, 25 is a heater support, 26 is an enamel layer, 27 is a coated resistor, 28 is a protective layer, 29 is a conductive part, 30 is a heater support, 31 is an enamel layer, 32 is a coated resistor, and 33 is a The conductive part 34 is a protective layer.

Claims (1)

[Scope of utility model registration request] It comprises a metal heater support, an enamel layer formed on the surface of the heater support, and a film resistor for fusing or welding a packaging film fixed to the surface of the enamel layer. A packaging film fusing or welding device characterized by: