JPS58101011A - Apparatus for covering surface of sheet - Google Patents

Abstract

PURPOSE:To prevent positively the burning of components including press rollers, by thermally insulating the contact piece of an electric current breaker in communication with a temperature controlling circuit from the outside, and operating the contact piece by an electric current independent of the surface temperature of heat transmitting bodies. CONSTITUTION:Heat radiating lamps 2A, 2B that serve as heat sources and arranged opposite to the outer circumferential surfaces of the press rollers 10A, 10B that serve as heat transmitting bodies and are for pressing a plastic film 12 placed on a sheet 11 are connected with an electric source 4, and the temperature controlling circuit 3 that consists of a temperature detector 31 such as a thermistor arranged adjacent to the surfaces of the rollers 10A, 10B and an electric current controlling circuit 32 such as Triac for controlling the quantity of electric current from the electric source 4 to be supplied to the lamps 2A, 2B by the signal from the temperature detector 31 is provided between the electric source 4 and the lamps 2A, 2B. The electric current breaker 5 including the contact piece 51 comprising a bimetal and a heater 52 is arranged between the circuit 3 and the electric source 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet body surface coating device for coating the surface of a sheet body such as a card with a plastic film.

Recently, in response to demands for imparting durability and water resistance to sheet bodies such as business cards and other cards, (2) the surface of the sheet body has been coated with a plastic film.

As a device for coating the surface of such a sheet body, a method using a pressure roller equipped with an internal heater or a method using a hot plate has been implemented, but it is possible to shorten the waiting time. Due to the increasing practical requirements, a method has been proposed in which the surface of the pressure roller that presses the film onto the sheet body is heated with a thermal radiation lamp.

As shown in FIG. 1, a device using thermal radiation lamps has thermal radiation lamps 2A and 2B facing each other on the outer peripheral surfaces of a pair of pressing rollers IOA and IOB.
One surface of the sheet 11 is covered by passing the plastic film 12 overlaid on the sheet 11 between the OA and IOB. Then, after closing the main switch of this seeding device a#'i, the press ports 10A and 10
In order to shorten the time it takes for the surface temperature of B to reach a predetermined temperature, the initial current supplied to the thermal radiation lamps 2A and 2B is increased, while the suppression four-ray IOA, 101
m surface humidity (3) After the temperature reaches the specified humidity, the heat radiation lamp 2A is turned on.

In order to maintain the temperature by reducing the current supplied to 2BK, for example, the pressure roller
A, 11 flow control circuit 32 including a humidity detector 31 such as a thermistor and a triac etc. to detect the temperature of the surface of JOB
A humidity control circuit 3 consisting of the following is provided between 11114 and the thermal radiation lamps 2A and 2B.

By the way, as mentioned above, if an abnormality occurs in the temperature control circuit 3 at the beginning of closing the main switch, an accident such as burnout of the pressure rollers IOA and 10B may occur.For example, the pressure rollers IOA and IOB may be made of silicone rubber. If you use a roller consisting of:

Using halogen lamps as the thermal radiation lamps 2A and 2B,
Set the surface temperature of the pressure rollers IOA and IOB to 170℃.
In such a device, for example, thermal radiation lamps 2A, 2B
Figure 3 shows the power consumption of the song! As shown by Il, the pressure is set to 100 OW immediately after the main switch is opened, and then it is gradually decreased, and after about 1 minute, the KfIII is suddenly decreased, and eventually it settles to around 10ff (4). Table of #! The temperature is in Figure 3, song C! Ii! Main switch/
From 08111111, the temperature rose sharply and reached #'i's fixed temperature after about 1 minute, but in the unlikely event that an abnormality occurred in the temperature control circuit 3, 11 flow reduction control was performed as the temperature rose. The power consumption of thermal radiation lamps 2A and 2B is 100%.
If OWK11 is held, press roller 10A, IO
B's table Wni! The degree increases with time (indicated by dotted lines), and after about 3 minutes and 20 seconds, the Ktlj pressure roller 10mm, 1
The heat resistance limit humidity determined by the material of 0B (approximately 300°C in the case of a roller made of silicone rubber) will be exceeded, and as a result, the pressure rollers IOA and IOB will be burnt out, and in this situation 11, the pressure roller 10. Inserting a film formed on the sheet body between IOBs will damage the sheet body, and furthermore, the pressure roller IOA
, 1011 as well as the outer cylinder of the device, etc., which not only damages the device but also poses a risk of fire. In addition, if a bimetallic switch piece (5) that is activated by detecting the surface temperature is provided near the surface of the pressure rollers IOA and IOB, when the temperature control circuit 3 is operating normally, The operating humidity point of the switch piece must be set so that the switch piece does not operate, but if the operating humidity point is set high, the switch piece will become cold due to the long C long ψ rest time such as at night. Even though the surface temperature of KFi, pressure roller 10m, and IOB rises rapidly, the time it takes for the temperature of the switch piece to reach the operating humidity point is quite long, so the switch piece does not operate. When the current supplied to the heat radiation lamps 2A, 2B is cut off, the pressure rollers IOA, IOB become overheated. The humidity of the switch piece is determined by the amount of radio waves flowing through it, the pressure roller IOA,
It is determined by the amount of heat received from the surface of the IOB and the amount of heat radiated from the surface of the switch piece, and the amount of heat radiation is influenced by the difference between the humidity of the switch piece and the temperature around it. , the operating temperature point of the switch piece is set to ψ when the temperature control circuit 3 operates normally and does not operate, and when it does not operate normally, the suppression rollers 10m, 10B(
6) It was difficult to set the humidity to such a level that the pressure roller 1 would become overheated.
Overheating of 0A, IOB, etc. cannot be reliably prevented. Or press rollers 10A, 10B instead of bimetal
Providing a critegister as a temperature switch near the surface of the critegister and quickly cutting off the current supplied to the heat radiation lamp 2M, 2BK by this critegister is a considerably high standard for the critegister. Since the switch circuit combined with the criterion also requires a considerable amount of cost, the cost of the current interrupter 111 for the device K becomes extremely high.

The present invention has been made based on these circumstances, and it is possible to suppress the price of the entire device in devices such as thermal radiation lamps that have high initial power consumption due to heat IK. The purpose is to provide a sheet surface coating device that can always reliably prevent burnout of component parts such as rollers, and its features include a heat source that melts and generates heat when energized from a power source, and a heat source that generates heat when energized from a power source. A heat transfer body that transfers heat to a plastic film wrapped in a sheet body (7) K 11, and a temperature detection device that detects the degrees of the heat transfer body inserted between the 11th century II Nada and the heat source. The signal from this humidity detector causes heat #! A temperature control circuit including a current control circuit that controls the amount of current supplied to the circuit, a bimetal-like switch piece inserted between the temperature control circuit and the power supply or heat source, and heat insulation surrounding the switch piece. and a current breaker provided with a member.

Embodiment V of the present invention will be described below with reference to FIG.

FIG. 4 is an explanatory diagram schematically showing the structure and circuit of the sheet body 11 according to the embodiment of the present invention. 2 and the pressing roller IO
A. A thermal radiation lamp 2A serving as a heat source is placed facing the outer peripheral surface of the IOB.

Continuing on from 2Btll#4, this! , between the power source and the heat width side lamps 2A, 2B, the pressing roller 10A,
A temperature detector 31 such as a thermistor placed near the front surface of the IOB and a switch such as a torch which controls the amount of current from the power #4 supplied to the thermal radiation lamps 2A and 2B based on the signal from the temperature detector 31). A current control circuit 32 and a temperature control circuit 3 are provided, and the temperature control circuit 3 and the front distribution power source 4 are connected to each other.
Between 1. a switch piece 51;
A current breaker 5 having a heater 52 which is connected in series to the switch piece 51 and heats the switch piece 51 by generating heat when energized is provided to constitute a sheet body surface coating device.

As shown in FIG. 5, a heater 52 is formed on the outer peripheral surface of a cylindrical metal case 53 whose closed end is formed into a reduced end 531, the surface of which is coated with an insulating coating. The heating conductor used is, for example, Nelmar #l! ! Looking around I, inside the metal case 53 is a metal piece 54 which is folded into two and held between them by a switch piece 51t made of bindal.
The bent edge 541 of the switch piece 51 is inserted and held in the reduced end portion 531, and the contact 541 of the switch piece 51 is
One lead terminal 6 connects and disconnects from 11 (9) to supply and disconnect the current.
AK connected *i point member 55 is measured, and the heater 52
One end is in contact with the metal piece 54, while the other end of the front 1 heater 52 is connected to the other lead terminal 6BK, and the #F metal case 53 and heater 52 are surrounded by a heat insulating member 56K such as epoxy resin. and configure. 57.58
The internal space twi is closed by closing the opening of each metal case 53.
Indicates an insulator made of J.

In the implementation fN of such a configuration, the main point t
However, in the initial stage, if a positive temperature coefficient thermistor is used as the temperature sensor 31, the operation of the pressure roller 10A may be interrupted for a long period of time, such as during opening or opening.

1 (When the surface of IB is cold, the temperature of the thermistor C's is low, so its resistance value is small, so the thermal radiation lamp 2A,
The amount of current flowing through 28 is large, but when the pressure roller IOA and 10'BC rise in temperature and the positive temperature thermistor also rises in temperature and its resistance value increases, the current increases as shown in Figure 3. II immediately decreases, and (lO) Eventually, when the pressure rollers IOA and IOB reach a predetermined temperature, the above-mentioned current becomes constant and the pressure rollers IOA and IOB reach a predetermined temperature. It becomes the benevolence that is maintained. - Current flows through the switch piece 51 and the heater 52Km114 in the Gami flow rate breaker 5,
As a result, the temperature of the switch piece 51 rises due to self-heating and heat generation from the heater 520, but since it is dangerous that the initial large current flows due to the control operation of the temperature control circuit 30, the contact member does not perform the opening operation. It remains in contact with 55. In this state, the plastic film 12 overlaid on the sheet body 11 is pressed by a pressing roller 10.

The sheet body 110 surface coverage is achieved by inserting the sheet body 110 into the joints 10B and 10B. If an abnormality occurs in the temperature control circuit 3, for example, the temperature detection circuit 1131, such as a thermistor. Or the triac etc. of the current control circuit 32 Kl! ! ! When an abnormality occurs and the temperature control as described above is no longer performed, the initial large current continues to flow through the current breaker 5, which causes the switch piece 51 to generate heat, and the heater 52 to generate heat as well, causing the current situation to deteriorate. (11) Heat is transferred to the switch piece 51 through the internal space of the metal case 53'11t, and as a result, when the above-mentioned large current continues to pass for a certain period of time, the temperature of the switch piece 511fi reaches the temperature point The contact 511 is bent so as to cross over 1K, and the contact 511 is separated from the contact member 55, and the heat radiation lamp 2A is connected to the power source 4.

2BVr Cut off the supplied current. When the current from the power supply 4 is cut off in this way, the temperature of the switch piece 51ti decreases, causing the switch piece 51ti to maintain its original position 11! , and from this K, the power supply 4 is connected to the heat radiation lamp 2 again, and the 2
Current will be supplied to the temperature control circuit 3.
If the abnormality continues to occur, the operation of opening and pasting the current path from the current circuit breaker 5 to the power source 4 will be repeated.

In the embodiment described above, the current breaker 5 equipped with a switch piece 51 made of bimetal is inserted between the power source 4 and the temperature control circuit 3, and the switch piece 51 is connected to the heat insulating member 56. Thermal radiation lamp 2A is thermally isolated from the outside by surrounding it.

2BK A configuration that operates according to the supplied current (12
), the temperature of the switch piece 51 is independent of the ambient temperature in which the pressure rollers IOA and IOB are placed [i temperature and current amount 1rii5].
It is determined only by the amount of current flowing through 1 and the time it flows. Therefore, the initial large current flows into the thermal radiation run η2, 2
B, that is, when the flow continues to flow through the switch piece 51, the time it takes for the surface temperature of the suppression rows 510A and 10110 to reach from room temperature to the temperature at which the sheet body surface coating is performed is t, and the time it takes to reach the heat resistance limit temperature. If tT, then 1. Is the switch piece 51 from t? By setting the operating temperature point of the switch piece 51 so that it operates between Kti and Kti during normal operation of the temperature control circuit 3,
When the temperature control circuit 3 is abnormal, the flow of KFI can be reliably shut off, making it easy to set the operating temperature point of the switch piece 51.
Overheating of the OB can actually be prevented. Moreover, the switch piece 51 is connected to the heater 52 that generates heat from the row K11mlj, and the heat from this heater 52 also causes the temperature of the switch piece 5111 to rise (13) degrees, so that the temperature of the switch piece 5111 is increased by (13) degrees. Even when the switch piece 51 has cooled down, such as after a downtime,
Temperature control - An abnormality occurs in path 3 and the heat radiation lamps 2A and 2B
When the initial large current continues to be supplied to the switch piece 51F,
Since the operation is performed in a relatively short time, overheating of the pressing rollers 10m, 10B, etc. can be more reliably prevented.

In this embodiment, the current breaker 5 is replaced by a switch piece 5.
Since it is an automatic type that returns to the energized state when the temperature of IIK 1 is activated and becomes energized, if the device is operated for a long time and the temperature of the switch piece 51 becomes higher than the operating temperature point, etc. When the current from the power supply 4 is cut off by the current breaker 5 even though the temperature control circuit 3#i is normal, the bales that have been left for a while can be operated again.

Here, as an example of the setting pressure of the operating temperature point of the switch piece 51, if rollers made of silicone rubber (heat resistant temperature approximately 300° C.) are used as the pressure rollers 10m and 101m, K, heat radiation lamp 2m, A herogen lamp is used as 2B.-1 Temperature control circuit 3 (14J) The power consumption of heat radiation lamps 2A and 2B changes as shown in FIG.
A. In a device where the IOB table ms degree is maintained at 170°C, the switch piece 51 is set to operate when an abnormality occurs in the temperature control circuit 3 and an initial large current flows through the switch piece 51tj for 1 minute. If set to , it is possible to reliably prevent the press reel 10m, IOB, etc. from overheating.

No. 6 WJ is a longitudinal sectional side view showing another example of the 11-way circuit breaker 5 used in the present invention. A disc-shaped switch/chip piece 51 made of bimetal is provided in the case 71 and has contact points 512, 513ti on its periphery. A hole 514 is formed in the center of this switch piece 51, and a holding portion 1i470 passes through this hole 514, and a portion thereof is threadedly engaged with the case 71 so that the position can be adjusted. ◎Meanwhile, the inside of the cylindrical case 71 Ka
, a contact member (15 pins 72.73) is provided for the contact point 512.513Kjl of the switch piece 51, and this contact member 72.73KFi,
Heaters 5 each provided on the bottom surface of the cylindrical case 71.
Connect the lead terminals 6A and 6B via 2.52'.

A plate having a diameter slightly smaller than the diameter of the III+distribution piece 51 is placed on the lower center portion 41 of the cover 74! 76
1, a furnace piece 76 constituting a push button is installed;
This operating piece 76 is supported by a spring 75 whose lower end is in contact with the holding member 70 to form a 1 m circuit breaker 5.

In the embodiment with such a configuration, when the temperature control circuit 3 is operating normally, the contacts 512, 513 of the switch piece 51 and the contact members 72, 73 are in contact with each other, and the power source 4 is connected to the thermal radiation lamp 2. Mu.

Current is supplied to 2B, but an abnormality occurs in the temperature control circuit 3, and the initial large current continues to flow through the thermal radiation lamp 2B, causing the 51 switch pieces to self-heat. The temperature rises due to the heat from the heaters 52 and 527. As a result, the contacts 512 and 513 are separated from the contact members 72 and 73 by inversion as shown by the dashed line,
Therefore, the current (16) of the power source 4 is cut off. The switch piece 51 is maintained in an inverted state at 1iK even if its temperature drops below the operating temperature point.
By pushing down the actuating piece 76, the shoulder portion is pressed by the plate portion 761, which returns to the original position and supplies current to the power source 4 and the heat radiation lamps 2 and 21.

The embodiment shown in FIG. 6 differs from the previously described embodiment in that the return operation of the switch piece 51 is performed manually, but similarly, even if an abnormality occurs in the temperature control circuit 3, the pressing
It is effective to always reliably prevent burnout of component parts such as the system, IOB, etc.

In addition, in the present invention, it is possible to insert a substitute between the concentration control circuit 3 and the heat source in addition to the substitute inserted between the WK11M cutoff I5 cutoff control circuit 3 and the electric power 114. Of course.

As described above, in the present invention, the switch piece of the current breaker inserted between the temperature control circuit and the power supply or the Korean heat source is thermally isolated from the outside, and the KM current is independent of the surface temperature of the heat transfer body. Since it is configured to be operated by the current supplied to the switch piece, it is possible to set the operating humidity point (17) of the switch piece to the desired level, and the pressure roller etc. become overheated before the KW & heat radiation lamp is activated. It is possible to interrupt the flowing current, and therefore, as mentioned above,
In devices with large initial power consumption in heat sources such as lithium ray lamps, it is possible to always reliably prevent burnout of W-powered parts such as pressure rollers without increasing the cost of the entire device.

[Brief explanation of the drawing]

#! Fig. 1 is an explanatory diagram schematically showing the configuration of the sheet body surface coating device, Fig. 2 is a block diagram showing the steps of the sheet body surface coating device, and Fig. 3 is an example of the sheet body surface coating device. , a characteristic curve diagram showing the correspondence between the surface temperature of the pressure roller and the power consumption of the thermal radiation lamp, FIG. 4 is an explanatory diagram schematically showing the configuration and circuit of an embodiment of the present invention, and FIGS. ! 6WJ is a vertical cross-sectional view showing an example of a current circuit breaker used in the present invention. 10A, JOB...press roller 11...sheet body 12...plastic film (18) 2A, 2B...thermal radiation lamp 3...temperature control circuit 31...temperature detector 32
...Current control circuit 4...Power source 5...Current cutoff II 51-...Switch piece 511.512,
513-...Contact 52.52'...Heater 53...Metal case 55.72.73...Contact member 56...Insulation member 6A, 611...Lead terminal O to 2A in Figure 1 Disposal 2 decoys Figure 4

Claims (1)

[Claims] 1) A heat source that generates heat when energized by a power source, a heat transfer body that transfers the heat from the heat source to a plastic film layered on the sheet body, and a heat conductor that is inserted between the power source and the heat source. , a temperature control circuit that includes a temperature detector that detects the temperature of the heat transfer body, and a current control circuit that controls the amount of current supplied to the heat source based on a signal from the temperature detector; If the switch piece made of bimetal is inserted between the fence and the heat source, and the I that surrounds this switch piece,
1. A sheet body surface coating device comprising: a current breaker equipped with a heat member;