JPH0219226A - Heat sealer - Google Patents

Abstract

PURPOSE:To obtain a small-sized heat sealer reduce in its wt. with good operability by supplying the power for the temp. detector of a heater from the power supply transformer provided for heating the heater. CONSTITUTION:One secondary winding 16 for heating a heater is provided to the secondary side of the power supply transformer 12 of a heat sealer in an insulated state and the heater 18 of the heater part 4 of an upper arm is connected thereto and a temp. detection sensor 18 like a thermocouple is directly connected to the heater 8 by welding and the output terminal thereof is connected to an amplifier 19. The amplifier 19 is connected to a switching regulator 14 through a photocoupler 20 but the power supply of the amplifier 19 and the photocoupler 20 is supplied from the secondary winding 21 for detection wound around the secondary side of a power supply transformer 12 through a constant voltage circuit 22. As a result, since the power supply of the temp. detector is obtained from the power supply transformer for the heater, the number of parts can be reduced, and miniaturization and wt. reduction can be achieved and heat sealing can be completed rapidly and certainly by short- time pressure contact operation.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is applicable to desk-top or hand-held devices that press a heater heated to a temperature higher than the welding temperature to a workpiece and weld the workpiece by heat transfer. It is a small heat sealer,
Thin films and bags (plastic bags) made of resin such as polyethylene, unstretched polypropylene, moisture-proof cellophane, polycello, etc., paper laminated or coated with resin, and other heat-weldable non-woven fabrics can be welded. This invention relates to a heat sealer for heat-welding sheets.

"Prior art" As a conventional small heat sealer, for example,
14968, a commercially available small installed type heat sealer as shown in FIG. 15, and a handy heat sealer developed by the inventor and proposed earlier.

The first conventional example, the technology disclosed in Japanese Utility Model Application Publication No. 53-14968, is driven by a low voltage through a fluorine resin block between an electrically insulating base and a heating element, and is detachable. As shown in Figure 2, a support Ma equipped with a heater M and a base Na having a heat-resistant/thermal insulating resin base N are installed so as to correspond to each other, and both can be opened and closed. The heater M is heated, and a heat-fusible sheet D is inserted between the heater and the heat-resistant and heat-insulating resin base N, and the sheet is pressed into contact with the heat-fusible sheet D.
The heat-fusible sheet is heat-welded.

The third prior art was previously proposed by the present inventor as a heat sealer that is heated by a low voltage power source and has a handy shape that can be operated with one hand. As shown in Fig. 13, this handy heat sealer has a pair of arms AI and A2 that are large enough to be operated with one hand, and are connected at their base ends so that they can be opened and closed with a bottle B. be.

A pair of heaters C1 and C2 having the same shape and characteristics are disposed on opposing surfaces of the pair of arms AI and Am, and two heat-fusible sheets superposed between the heaters Ct and C2 are disposed so as to correspond to each other. D is sandwiched and welded by the heat generated by the heaters C1 and Cm.

FIG. 14 shows an electric circuit of the above-mentioned handy type heat sealer, in which a switching element F is inserted in series on the primary side of a power transformer E, and is connected to a commercial AC power source.

In addition, on the secondary side of the power transformer E, there are two
Secondary windings G, G2 are formed, and the heaters C1, C2 are connected to the secondary windings G1, G2, respectively.

In addition, in order to maintain the heaters Cr and C2 at a constant temperature, one of the heaters C1 and 02 is equipped with a temperature detection sensor H.
The detection signal of this temperature detection sensor H is amplified by an amplifier I, and then the switching regulator F is feedback-controlled via a photocoupler J to maintain the heater CICa at a set temperature. There is. Here, the operating power for the amplifier I and photocoupler I is supplied from a power transformer K that is separate from the power transformer E for heating the heater. L is a constant voltage circuit. Note that all of the power supply circuits described above are built into a pair of arms A+ and At.

"Problems to be Solved by the Invention" The first conventional example is described as being suitable for reducing size and weight, but it is driven by a high voltage and a blower is attached to cool the residual heat of the high-temperature body. This is a simple structure, and the level of miniaturization and weight reduction that the present invention aims at is completely different. In contrast, the present invention uses a low voltage drive method,
The premise is to be able to maintain safety without the need for a blower, and even though they are the same heat sealer, the models are different, and the technical issues to be solved are completely different.

Since the heat sealer of the second conventional example does not perform heating control after detecting the temperature of the heater, the heating time of the heater is long and the power loss is large. In addition, since the heat capacity is large in general, energy loss during startup is large, and it takes time for the heater to cool down even when the power is turned off, which poses safety problems such as the risk of burns.

A third conventional example is a small, handy-type heat seal developed by the present inventor in order to solve the above-mentioned problems.

The conventional handy type heat sealer has a first embodiment,
Although it is considerably smaller in size than the conventional one such as the second embodiment, it is still suitable for the power transformer E for heating, the amplifier I of the temperature detection circuit, and the photocoupler J. Requires a special power transformer K. This transformer K
No matter how small the heat sealer is, there are two power transformers E, one for sheet heating and one for temperature detection, inside the heat sealer body.
If K is incorporated, the weight will increase and the operability will deteriorate. Moreover, the number of parts increases accordingly, which goes against the demand for miniaturization, and is also problematic from an economic point of view.

The present invention was made in order to solve the above-mentioned drawbacks, and by supplying power from the power transformer provided for heating the heater, which is the power supply for the temperature detector of the heater, it is possible to reduce the number of power transformers by using at least one power transformer. It is an object of the present invention to provide a heat sealer which is more compact and lightweight than the third conventional example and has good operability.

In addition, the present invention employs a high frequency switching method for the switching regulator that is activated by the detection signal from the temperature detector, thereby promoting further miniaturization and weight reduction, aiming at reducing costs, and improving reliability as a heat sealer. The aim is to ensure safety and security.

Means for Solving the Problems" The present invention is configured as follows in order to solve the various problems described above.

The first invention for which a patent is sought is a pair of arms connected so as to be operable to open and close, a thermally defective conductor being disposed on one of the arms, and a thermally defective conductor arranged in the other arm to correspond to the thermally defective conductor. In the heat sealer, a heater is provided, a heat-fusible sheet is superimposed and sandwiched between the two arms, and the heat-fusible sheet is welded by the heat generated by the heater. The heater is connected to the secondary winding of the power supply, the temperature of the heater is detected by a temperature detector, and the detection signal is used to control a switching circuit inserted in the primary or secondary side of the power transformer. The heat sealer is characterized in that a heater is heated to a predetermined temperature necessary for welding, and power is supplied to the temperature detector from a secondary winding for detection provided on the secondary side of the power transformer. The heat sealer according to the present invention has two arm parts that are large enough to be held in one hand and are rotatably connected by a hinge.
It is a small, handy heat sealer that can be easily carried anywhere, and can be easily heat-sealed by opening and closing both arms by pressing the fingers of one hand and pressing the heater into contact. Although it is miniaturized, it can be realized as a small tabletop heat seal that can be placed on a desk.

Various types of temperature detectors can be considered, including, for example, a temperature detection circuit configured with a temperature detection sensor, an amplifier, and a photocoupler.

For example, switching circuits include not only a switching regulator that varies the pulse width and changes the secondary output voltage as shown in FIG.
As shown in figure (a), the primary winding tap switching type,
Alternatively, as shown in Figure 5 (b), a diode is inserted for half-wave rectification, or a resistor is inserted in place of the diode as shown in Figure 5 (c), or a resistor is inserted in place of the diode as shown in Figure 5 (d). Alternatively, a capacitor may be inserted to vary the secondary voltage. In this case, it is of course possible to use commercial frequencies. The switching circuit may be inserted into the primary side or the secondary side of the heating power transformer, but as in the embodiment, by inserting it into the primary side and controlling it, the switching circuit can be inserted into the primary side of the heating power transformer. It is desirable to control the voltage on the side. This is because the circuit on the secondary side of the heating power supply transformer carries a large current, so it is disadvantageous in terms of cost and reliability to turn this circuit on and off directly. This is because it is more advantageous to turn it off.

The second invention for which a patent is sought is a pair of arms connected to each other so as to be operable to open and close, heaters having the same shape and characteristics being arranged in correspondence with each other on both arms. In a heat sealer configured to polymerize and sandwich a heat-fusible sheet between heaters and weld them together by the heat generated by the heater, two heater heating secondary windings provided on the secondary side of a power transformer are used. Each of the heaters is connected to the heater, the temperature of at least one of the heaters is detected by a temperature detector, and this detection signal controls a switching circuit inserted on the primary side or the secondary side of the power transformer. The heat sealer is characterized in that the heater is heated to a predetermined temperature necessary for welding, and the temperature detector is supplied with power from a secondary winding for detection provided on the secondary side of the power transformer. .

The invention of the second claim provides both of the arms that can be opened and closed.
This heat sealer is of a type in which heaters are arranged in correspondence with each other, which is different from the invention claimed in claim 1, in which the heater is arranged only on one side of the arm. The claimed invention includes both types of high-day type heat sealers and desktop type heat sealers.

The temperature may be detected by the temperature sensor at one or both of the heaters.

Since the other configurations are the same as the invention of the first claim,
The explanation here will be omitted.

"Function" The heat sealer according to the present invention has two arm parts large enough to be operated with one hand or fingers, which are rotatably connected by a hinge, so that the arm parts can be easily opened and closed with one hand or fingers. In this method, the heater is temporarily heated to a predetermined temperature at which welding can be performed, and then the sheet is pressed against the fusible sheet, whereby the fusible sheet is welded and heat-sealed easily.

A small heater is placed on the arm supported by the bottle, and quickly and temporarily heats it to the required melting temperature using a low amount of electricity.

At this time, the temperature of the heater is detected, and based on that information,
The switching circuit for heating the heater is controlled, thereby controlling the heating voltage of the heater, thereby controlling the heating temperature of the heater.

In the case of the first claim, since the heater is provided only on one side of the arm portion, the speed of heating and melting and the limit of the heat-sealable thickness of the fusible sheet are somewhat reduced, but the temperature of the heater is detected. However, this feedback can be fed back to the heater so that it can always reach a predetermined melting temperature, making the heat sealing work extremely reliable and reliable.

In the heat sealer according to the second aspect, since heaters are provided on both sides of the arm portion, heat can be transferred from two directions with a relatively low amount of electric power. Therefore, even when welding a plurality of overlapping surfaces at the same time, heat can be uniformly transferred from the heaters on both sides toward the heat-fusible sheet, so welding can be performed reliably and quickly.

That is, by heating from both sides, it is possible to make the rise characteristics of the welding temperature, the final temperature, and the heat dissipation characteristics more uniform, so that it is possible to achieve a faster and more uniform heat sealing to a higher level than before.

In this way, the two inventions of the present application both enable effective use of heating energy by feedback controlling the temperature or heating time of the heater, and the capacity of the transformer becomes extremely small, making the overall device compact and It is possible to reduce the weight.

Moreover, power was supplied to the temperature detector from a secondary winding for detection provided on the secondary side of the heating power supply transformer. As the output voltage on the secondary side fluctuates, the secondary voltage applied to the constant voltage circuit of the temperature sensor also fluctuates, but due to the low power consumption, it is necessary to adequately deal with fluctuations of this magnitude. It is possible to reduce the voltage. This eliminates the need for a separate power transformer for the temperature detector, making it possible to operate it with a single heating power transformer, making it possible to reduce the size, weight, and cost of the entire device. It became a thing.

"Embodiment of the Invention" (First Embodiment) FIG. 1 is a front view showing an embodiment of a tabletop heat sealer according to the present invention, FIG. 2 is a side view of the same heat sealer, and FIG.
The figure is an enlarged perspective view of a heater portion used in the heat sealer.

In the figure, the upper arm part 1 is large enough to be manually operated.
A pair of lower arm portions 2 are connected at their base end portions by a bottle 3 so as to be openable and closable. Note that both arm portions 1.2 are always kept in an open state by a spring (not shown) when no welding work is being performed. A thermally poor conductor 5, which is elongated in the axial direction of the arm part, is arranged on the opposing surface of the free end side of the one arm part 1, and the other -
On the arm 2, a long heater section 4 is connected to the thermally defective conductor 5.
It is installed axially so that it faces oppositely to the Here, the heater section 4, as shown in FIG.
It is composed of a heat insulating member 6 and a band-shaped heater 8 attached to the outer surface of the heat insulating member 6.

As a result of the heater section 4 being configured as described above, heat is not easily transferred to the upper arm section l and the lower arm section 2 due to heat conduction of the heater 8, so that when opening and closing the sealing operation by hand, the arm sections 1.2 temperature rise can be suppressed. Further, by providing the grip portion 1a on the upper surface of the upper arm portion 1, it is possible to improve the ease of gripping and further suppress the temperature increase due to heat conduction from the arm portions 1 and 2 with which the hands come into contact.

Reference numeral 10 denotes a power switch that is turned on and off by opening and closing the upper and lower arm sections 1.2.This power switch 10 is attached to the upper surface near the base end of the lower arm section 2, and
．． 2 is configured to be closed by a push button 11 attached to the lower surface near the base end of the upper arm portion l.

As described above, by forming the upper and lower arm parts 1.2 together with the bottle 3 into a tabletop type Stella puller shape, a lightweight and compact structure can be achieved, and the operation thereof is as simple as pushing the arm part 1 lightly against the lower arm part 2. This greatly reduces the burden of working for long periods of time, and even female workers can operate it easily.

FIG. 4 is an electrical circuit diagram of the tabletop heat sealer. In the figure, 12 is a power transformer, and its negative side 13
is connected to the rectifier circuit 1 via the switching regulator 14.
5, and the input side of the rectifier circuit 15 is connected to a commercial AC power source. Here, the switching regulator 14 is normally used to stabilize the output voltage, but in the present invention, the switching regulator 14 is used to stabilize the output voltage.
It is used to vary the next side.

The power source of the switching regulator 14 is a direct current rectified by the rectifier circuit 15, and 15A is a capacitor for removing ripples. Furthermore, although there are various types of switching regulators 14, a high frequency switching type is particularly desirable in view of the need for miniaturization and weight reduction.

One heater heating secondary winding 16 is insulated and provided on the secondary side of the power transformer 12, and this secondary winding 16 is provided with a heater of the heater section 4 of the upper arm. 8
is connected.

Further, a temperature detection sensor 18 such as a thermocouple is directly welded and connected to the heater 8.
The output terminal of is connected to an amplifier 19. The amplifier 19 is connected to the switching regulator 14 via a photocoupler 20. Here, the power source for the amplifier 19 and the photocoupler 20 is supplied from the constant voltage circuit 21 from the detection secondary winding 21 wound on the secondary side of the power transformer 12.
2. Note that the temperature detection sensor 18, amplifier 19, and photocoupler 20 constitute a temperature detection circuit.

In this embodiment, the temperature of the heater is detected by a temperature detector as described above, and the switching circuit inserted in the primary side of the heating power supply transformer is controlled by this detection signal,
Thereby, the secondary voltage is controlled to heat the heater to a predetermined temperature necessary for welding, thereby achieving reliable heat sealing.

(Second Embodiment) Fig. 6 is a front view showing an embodiment of the handy heat sealer according to the present invention, Fig. 7 is a side view of the heat sealer, and Fig. 8 is an enlarged view of the heater portion used in the heat sealer. FIG.

In the figure, the upper arm part 1 is large enough to be operated by hand.
and the lower arm part 2 is connected to the bottle 3 at its base end.
The above-mentioned both arm parts 1
．． 2 is always kept open by a spring (not shown) when no welding work is being performed. Heater parts 4a and 4b having the same shape and characteristics are attached to opposing surfaces of the free end sides of both arm parts 1.2, respectively, so as to face each other. As shown in FIG.
, 6b, strip-shaped heaters 8a, 8b are installed along the
It is composed of.

In addition, the grip part 1a, power switch 10, etc. in the figure are the first
Since this is the same as the embodiment, the explanation will be omitted.

FIG. 9 is an electrical circuit diagram of the above-mentioned handy heat sealer. In FIG. 0, 12 is a power transformer;
3 is connected to the output side of a rectifier circuit 15 via a switching regulator 14, and the input side of the rectifier circuit 15 is connected to a commercial AC power source. Here, the switching regulator 14 is used to vary the secondary side of the power transformer 12.

The power source of the switching regulator 14 is a direct current rectified by the rectifier circuit 15, and 15A is a capacitor for removing ripples. Further, as in the first embodiment, the switching regulator 14 is desirably of a high frequency switching type in view of the requirements for miniaturization and weight reduction.

On the secondary side of the power transformer 12, two heater heating secondary windings 16 and 17 are provided insulated from each other. The heater 8a of the heater section 4a and the heater 8b of the lower heater section 4b are connected.

Further, a temperature detection sensor 18 such as a thermocouple is directly welded and connected to either one of the heaters 8a, 8b, and the output end of the sensor 18 is connected to an amplifier 19. The amplifier 19 is connected to the switching regulator 14 via a photocoupler 20. Here, power for the amplifier 19 and photocoupler 20 is supplied via a constant voltage circuit 22 from a detection secondary winding 21 wound on the secondary side of the power transformer 12. Note that the temperature detection sensor 18, amplifier 19, and photocoupler 20 constitute a temperature detection circuit.

As described above, the arm section 1.2 under -E is shaped like a hand-held stealth puller together with the bottle 3, and the power source for the amplifier 19 and photocoupler 20 is wound around the secondary side of the power transformer 12. From the secondary winding 21 for detection to the constant voltage circuit 2
2, the power transformer 1'2 is reduced to one, reducing the number of parts, and if necessary, the switching regulator 14 can be made into a compact, lightweight, high-frequency switching system. As a result, it has become possible to create a lightweight and compact structure with an overall weight of 500 g or less. As a result, it has become possible to perform seat heeling very simply and with less force, such as holding a handy small stapler in one hand and using the fingertips to staple the document.

Although shown in the drawings but not described in detail, a table-top heat seal having a configuration in which heaters are provided on both sides of the arm portion may be realized as an embodiment other than the second claim, and other embodiments other than the first claim may also be implemented. As an example, it is of course possible to embody a handy heat sealer having a configuration in which a heater is provided on one side of the arm portion and a thermally defective conductor is provided on the other side.

Next, the operation of the above embodiment will be explained.

The difference between the first embodiment and the second embodiment is that one or both heaters are used, but the principle is the same, so both will be explained together below.

When commercial AC power is applied to the input terminal of the rectifier circuit 15,
A rectified DC voltage is output to the output side of the rectifier circuit 15. This DC voltage is the switching regulator 1
4 to the primary winding 13 of the power transformer 12, the voltage is applied to one or two heaters 2 on the secondary side.
A high frequency voltage of a predetermined potential is generated in the next winding 16, 17, and the heater 8, 8a, 8b connected to each winding
is heated. Here, since the heat capacity of the heater 8 or 8a, 8b is small, if no control is applied, the temperature will rapidly rise beyond the optimum welding temperature of the welding seal, resulting in an overheating state. 8 or 8a, 8b
The temperature detection sensor 18 connected to the sensor 18 detects the temperature, and its weak detection power is amplified by the amplifier 19 and controls the switching regulator 14 via the photocoupler 20. That is, when the temperature of the heater 8 or 8a or sb becomes higher than the set value, the pulse width is narrowed, and when it becomes lower than the set value, the pulse width is widened.

Due to the above effects, the output voltage on the secondary side fluctuates. For example, when the output voltage on the secondary side changes at a ratio of 2=1, the power consumed by the heater 8 or 8a s8b changes at a ratio of 4:1. Therefore, the voltage fluctuation is sufficient for rapid temperature control. At this time, the secondary voltage applied to the constant voltage circuit 22 also fluctuates at a ratio of 2:1, but due to the low power consumption, it is possible to sufficiently cope with such fluctuations, and the voltage cannot be made constant. It is possible.

In addition, the heating of heater 8, 8a, 8b still generates Joule heat regardless of whether it is at commercial frequency (50Hz, 60) (z) or high frequency, so the secondary winding and heater need only be connected directly. good.

Note that the switching regulator 14 is connected to the heater 8 or the temperature sensor 18 connected to 8a, 8b
However, since the primary side and the secondary side of the power transformer 12 are electrically isolated by the photocoupler 20, the switching regulator 14 is not affected at all.

In the second embodiment, although the heaters 8a and 8b are exposed, there is no short circuit even if the heaters 8a and 8b come into contact with each other. The reason why there is no short circuit will be explained with reference to FIGS. 10 and 11.

That is, considering the state in which the two heaters 8a and 8b are in direct contact, in the case of point contact f as shown in Fig. 10, the secondary windings 16 and 17 are independently insulated. ,2
No current flows between the next windings 16 and 17, causing no problem.

Also, as shown in FIG. 10, there are upper and lower heaters 8a.

When the heaters 8b are in two-point contact d and e due to the convex portion, the resistances R1 and R2 of the heaters 8a and 8b are The values are considered to be approximately equal. Therefore, the voltage drops due to heaters 8a and 8b are also considered to be approximately equal, and even in the case of two-point contact d and e as shown in FIG. 11, each heater 8a and 8b is No current flows through contact points d and e, as if they were energized independently.

This situation will be explained below using the equivalent circuit shown in FIG. That is, the applied voltages Et and Ea are equal, and the heater 8a
, ral and RI are given a voltage E since the characteristics of the heater 8b are almost the same.

The three combined resistance values of rtz and r given voltage E3
The three combined resistance values of a x * Rz * r b z are equal, and the current value I flowing through the closed circuit given the voltage El and the current value I2 flowing through the closed circuit given the voltage E2 are ohms. They are equal according to the law of Even if the resistance value rat and the resistance value ra are different here,
The voltage drop due to R8 and the voltage drop due to R2 are equal according to Ohm's law. Therefore, even when the heaters 8a and 8b are in contact as shown in FIG.
No current flows through the contact point between and e.

Therefore, there is no need to insulate the heaters 8a, 8b with a heat-resistant film or the like, and it is possible to avoid the dangerous situation that occurs when directly heating the sheets to be welded.

Furthermore, by effectively utilizing energy for heating with less heat loss, the capacity of the power transformer used can be made relatively very small, making the entire heat sealer device smaller and lighter. I can do it.

In addition, in order to obtain electrical insulation, conventional methods have been used to coat the surface of the heater with a heat-resistant thin film, and due to the effect of this coating, the heater and the sheet to be welded may be bonded depending on the set surface temperature of the heater. However, in the embodiments of the present invention, since the film heater is not interposed, the problems associated with the bonding are solved.

Here, a ribbon-shaped nichrome wire can be used as the heat generating source for the heater 8, 8a, 8b, but preferably the heating element is formed into a thin film on the surface of the ceramic material by vacuum evaporation, sputtering, CVD, etc. Other physical,
It is best to layer the heat generating elements firmly using a chemical method. By layering the heating element in a strong thin film using a physical or chemical method, the heat capacity of the heater section can be significantly reduced, allowing for faster temperature rise. characteristics can be obtained.

At the same time, the fact that the heat capacity of the heater part is small means that when you release your hand and open the upper arm part l and the lower arm part 2, the power switch 11 is turned off and the heater 8, 8a, 8
When the power supply system to b is turned off, the heater 8 or 8a.

The temperature of 8b will drop rapidly. As a result, the worker does not come into contact with the hot heaters 8, 8a, 8b, and the probability of accidents such as burns is drastically reduced, and power loss is also reduced by shortening the energization time. This high rate of temperature rise and fall is useful for preventing worker fatigue by maintaining a weldable state for a long time, and also for heat sealing work because the temperature can be lowered quickly and the next work can be started. This leads to higher efficiency.

"Effects of the Invention" As explained above, the heat sealer according to the present invention has
Two arms that can be operated by hand are connected by a hinge so that they can be opened and closed, heaters are installed in both arms, and a high frequency, low voltage, large current is passed through the heaters to control heat generation, and the arms are closed. The heater is temporarily heated and welded only when the heater comes into contact with the sheet to be welded, so the arm part can be opened and closed automatically by manual operation or fingertip operation. A homogeneous seal can be achieved.

Moreover, a temperature detector is provided to detect temperature changes of the heater, and this detection signal is used to feedback control the temperature or heating time of the heater. , faster, leaner, and more uniform.

Moreover, the power for the temperature sensor is obtained from the power transformer for heating the heater, rather than being supplied from a power transformer separate from the power transformer for heating the heater, as in the conventional case. Therefore, the number of parts can be reduced accordingly, and the heat sealer of the present invention can be made smaller and lighter than conventional heat sealers.

As a result, the heat sealer of the present invention can be made small and lightweight enough to be held in one hand and operated with the tip of a finger, and can be quickly and easily applied by pressing within a few seconds at the latest, usually around 1 second. It has high performance in that it can reliably complete heat sealing. In addition, by using a high frequency, sufficient heat generation and operation can be achieved even at low voltage, which not only enables long-term operation on batteries, but also reduces power consumption and thermal energy loss, making it efficient and economical. It is an expensive device. Furthermore, the heater is in a dangerously high temperature state only for a short period of time when the heater is in pressure contact with the heater, so it is a highly practical handy heat sealer that is highly safe.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the heat sealer according to the invention of claim 1, and FIG. 2 is a side view of the heat sealer, and FIG.
Fig. 3 is an enlarged perspective view of the heater part used in the heat sealer, and Fig. 4 is an electric circuit diagram of the heat sealer.
5(a), 5(b), 3(c), and 5(d) are circuit diagrams showing other embodiments of the switching circuit portion according to the present invention, and FIG.
FIG. 7 is a front view showing an embodiment of the handy heat sealer according to the claimed invention; FIG. 7 is a side view of the same heat sealer;
The figure is an enlarged perspective view of the heater part used in the heat sealer, FIG. 9 is an electric circuit diagram of the handy heat seek according to the present invention, FIGS. 10 and 11 are explanatory diagrams of the heater insulation function of the handy heat sealer, Figure 12 is Figure 10, Figure 1
Fig. 1 is an equivalent circuit diagram explaining the heater insulation effect, Fig. 13 is a front view of a conventional small heat seeker, Fig. 14 is an electric circuit diagram of the same small heat sealer, and Fig. 15 is another conventional example. FIG. 1.2... Arm part, 3... Bin, 4.4a, 4b... Heater part, Figure 2, Figure 3, 8.8a, 8b... Heater, 2... Power transformer, 4...Switching regulator, 6.17...
Secondary winding for heater heating, 8... Temperature detection sensor, 9... Amplifier, 0... Photo coupler, l... Secondary winding for detection.

Claims (2)

[Claims] (1) A pair of arms are connected so as to be operable to open and close, a thermally defective conductor is provided on one arm, a heater is provided on the other arm to correspond to the thermally defective conductor, and both the arms are provided with a heater. In a heat sealer configured to polymerize and sandwich a heat-fusible sheet between the two and weld it by the heat generated by the heater, the heater is attached to a secondary winding for heating the heater provided on the secondary side of a power transformer. The temperature of the heater is detected by a temperature sensor, and this detection signal controls the switching circuit inserted into the primary or secondary side of the power transformer to bring the heater to a predetermined temperature necessary for welding. A heat sealer characterized in that the temperature sensor is heated and power is supplied to the temperature sensor from a secondary winding for detection provided on the secondary side of the power transformer. (2) A pair of arms are connected so as to be operable to open and close, heaters of the same shape and characteristics are arranged on both arms so as to correspond to each other, and a heat-fusible sheet is polymerized between the two heaters. In a heat sealer configured to be sandwiched between two heaters and welded by the heat generated by the heater, two heaters for heating 2 provided on the secondary side of a power transformer are used.
Each of the above heaters is connected to the next winding, the temperature of at least one of the heaters is detected by a temperature detector, and this detection signal controls the switching circuit inserted on the primary side or secondary side of the power transformer. to heat the heater to a predetermined temperature necessary for welding, and the temperature detector is supplied with power from a secondary winding for detection provided on the secondary side of the power transformer. heat sheila.