JPS62145272A - Temperature controller - Google Patents

Abstract

PURPOSE:To use a heater for fixation in common regardless of the voltage of a country where a temperature controller is used by varying the rate of feeding to the heater according to a voltage. CONSTITUTION:The heater 2 has 500W capacity at AC 100V, but its means electric power P is represented as P=¦E¦<2>/R, where ¦E¦ is an effective voltage value and R is the resistance value of the heater 2. When the electric power at the commercial source voltage in Japan is P100 and the effective voltage is ¦E100¦, P100 is calculated from an equation (I). When the effective voltage ¦E120 at AC 120V is ¦1.2.E100¦ so as to obtain P12=P100 where P120 is the electric power at 120V as the commercial source voltage is America on condition that the equation (I) holds, P12 is expressed by an equation (II). The feeding rate K=1/1.44 is calculated from the equation (II) and then 500W mean electric power is obtained even during AC 120 V application.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a fixing device installed in an electrophotographic copying machine, a printer applying electrophotographic technology, a facsimile machine, etc., and more specifically, a fixing device using a heat fixing method. The present invention relates to a temperature control device.

[Traditional technique]

Generally, this type of heat fixing type fixing device uses a heater that can be driven by a commercial power source as a heat source. A heater of 500 to 600 W is normally used, but since the voltage of the commercial power source differs depending on the country where it is used, it is necessary to use a heater with a different resistance value depending on the country in order to keep the power consumption constant. For example, in Japan, a toov heater is installed, in the US, a 12OV heater, and in Europe, a 220V heater.

[Problems with conventional technology]

However, in the above-mentioned fixing device, heater specifications differ depending on the country, so if, for example, a heater intended for Japan is incorrectly attached to a fixing device intended for Europe during assembly, the heater will consume excessive power and be damaged. Furthermore, when a change in production plans occurs, it becomes necessary to rearrange the heaters on the one hand, and surplus inventory arises on the other hand. Furthermore, since the heaters are different depending on the country, there is a drawback that the management of maintenance heaters (service parts) requires complicated labor.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned drawbacks and to provide a temperature control device that can share a fixing heater regardless of the commercial power supply voltage of the country in which it is used.

[Key points of the invention]

In order to achieve the above object, the present invention includes a heating means for heating a fixing device, a temperature detection means for detecting the temperature of the fixing device, and a control means for controlling the heating means based on the output of the temperature detection means. In the temperature control device, the temperature control device includes: an input means for inputting a voltage end t applied to the heating means; a waveform storage means for outputting a predetermined waveform based on information of the input means; The heating device is characterized by comprising an energization control means for controlling energization to the heating means based on the output.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 3 shows a schematic configuration diagram of a heat fixing type fixing device.

In FIG. 3, ``■'' has a heater 2 inside, and a resin 1. made of Teflon or the like having heat resistance and a one-dish type property for toner on the circumferential surface. ．． It is a heating roll coated with No. 1 and rotates in the direction shown. The heater 2 is a far-infrared heater having a capacity of 500 W at ΔC of 100 V, and has a resistance value of 20 Ω when converted into a resistance value. Heater 2 consumes 2420 W when AC 220 V, which is the commercial power supply voltage in Europe, is continuously applied, but the far infrared heater is designed so that it will not break even when used in this way. There is. Therefore, there is no problem even if the heater 2 exceeds the rated voltage, and the color temperature of the heater 2 is 1200.
It is desirable that the temperature be around 30°.

A pressure roll 3 whose peripheral surface is coated with heat-resistant and elastic silicone rubber or the like is pressed to the lower part of the heating roll 1 with appropriate pressure to form a nip 4. Works with Roll 1. and,
Insert the paper on which the 1-ner image has been formed into the nip part 4 at the arrow mark \
Each time the paper is held and conveyed from one direction to another, the paper is pressed, and at this time, the heating action of the heater 2 and the pressing action of the pressure roll 3 heat-fuse the toner image onto the paper, thereby performing a fixing operation. The paper discharge side of the circumferential surface of the heating roll 1 is placed in contact with the tip of a peeling claw 5 to peel the paper discharged from the nip section 4 from the heating roll 1, and then the paper is further removed by the paper discharge roll 6. (Non-exit) outside the aircraft.

Further, a thermistor 7 for temperature detection is attached to the circumferential surface of the heating roll 1 in contact with the circumferential surface of the heating roll 1, and this thermistor 7 is attached to the arm 8. This arm 8 is rotatably provided around a shaft 8a. Further, as will be described later, energization to the heater 2 is controlled based on the temperature detected by the thermistor.

FIG. 1 shows a specific configuration of a control circuit that controls the energization of the heater 2 described above.

First, as mentioned above, the heater 2 has a capacity of 500W at 100V AC, but its average power P is equal to the effective voltage value II
If EI and the resistance value of heater 2 are R, P= IE 1
It is expressed as 2/R. Currently, the commercial power supply voltage in Japan is 100
The power at ■ is Ploo, the effective voltage is lE+ool
Then, P too can be calculated using the following equation (1).

P too = I E+oo l 2/ R= 50
0W...(1) (1) Under the condition that 2 holds true, the power at 120V, which is the commercial power supply voltage in the United States, is P1□. Close, P.I.
20 =p+oo, the effective voltage IE at 120V AC, □. l = 11.2 ・E,oo
If l, then P1□. is expressed by the following equation (2).

PI3゜=K・11.2・E,. . 12/R=1.44
・IEl. o 12/R = 500W... (2) If the current conductivity K = 1/1.4/l from equation (2), then AC1
It can be seen that an average power of 500 W can be obtained even when 20 V is applied. Also, since 1/1.44 = 5/7, 5 cycles of the sine wave of the commercial power supply are
If energized, an average power of 500W will be obtained.

Furthermore, in the case of European commercial power supply voltage 220■, the power at AC 220V is assumed to be P2□0, and then P2□.

To make =P+oo, the effective voltage IE2□. 1=
12.2 ・If Etoo l, P 22G
is expressed by the following equation (3).

P2□. -K・12.2・EIO012/R-4,8
4・K・lE+oo12/R・・・・・・(3) From equation (3), the current conduction rate K is 1 for when AC100V is applied.
/4.84. Also 1/4.84 ==, 5
/24, it is sufficient to energize the heater 2 for 5 cycles for 24 cycles of the sine wave.

Based on this idea, the embodiment of the temperature control device shown in FIG. 1 will be described in detail.

The thermistor 7 is a temperature detection element that detects the surface temperature of the heating roll 1 as described above. Thermistor 7 is resistor R
1 in series, and its divided voltage is inputted to the non-inverting terminal (+ terminal) of the comparator circuit Q1 as the temperature detection output 8 of the thermistough.

A voltage v1 divided by a resistor R2, a resistor R3, and a variable resistor VR is input as a reference voltage to an inverting terminal (one terminal) of the comparator circuit Q. Therefore, the resistance value of the thermistor 7 decreases as the temperature rises, and the resistance value increases as the temperature decreases. Therefore, when the temperature detected by the thermistor 7 becomes higher than the set temperature, V,>V, and the comparator circuit The output of Q becomes a low level.Then, this low level signal is output to the AND circuit Q2 as a command signal to stop energization of the heater 2.Furthermore, when the temperature detected by the thermistor becomes lower than the set temperature, V, <VN, the output of the comparator circuit Q1 becomes high level, and this high level signal is outputted to the AND circuit Q2 as an energization command signal to the heater 2.

Reference numeral 9 denotes a program memory (hereinafter referred to as PGM), which stores a program that causes the energization rate to the heater 2 to correspond to the voltage of the commercial power supply described above, using the dip inch DSI and DS2. That is, dip switch DS
L is connected in series with resistor R1, and its connection point is connected to PGM
Similarly, dip switch DS2 and resistor R6 are connected in series, and the connection point thereof is input to PGM9.

As a result, when the deep inch DSL and DS2 are turned on, the connection point becomes high level, and when turned off, it becomes low level, so by inputting these high level or low level signals, the connection point is stored in advance in the PG M 9. The current control program for the heater 2 can be read out. In this embodiment, the dip switch DS
When L and DS2 are both off, a program compatible with AClooV will run when DIP switch DSI is off and DS2 is off.
When is on, a program compatible with AC120V,
Further, when the deep inch DSL is on and DS2 is off, a program compatible with AC220V is read out.

The commercial power supply 10 includes the above-mentioned heater 2 and a triac 1 as a bidirectional switch element for controlling energization to the heater 2.
1 are connected in series, and a full-wave rectifier 12 is connected in parallel with the commercial power supply 10.

As will be described later, the triac 11 is turned on and off by a drive signal from a trigger circuit 13 driven by an output signal from an AND circuit Q2 which receives outputs from a comparison circuit Q and PC, M9. The output of the full-wave rectifier 12 has a light emitting diode 14a of a photocoupler 14 connected in series and a resistor R1, and an isolated phototransistor 14b is operated by the output of the light emitting diode 14a. The light emitting diode 14a is connected to a commercial power source 10.
is 5011z, 100 times per second (100PP
Since the pulse current 5) flows, the phototransistor 14b on the light receiving side is also turned on in response to this, and outputs its output to the waveform shaping circuit 15. The waveform shaping circuit 15 receives the light reception signal of the phototransistor 14b, synchronizes with the waveform of the commercial power supply 10, shapes the waveform into a pulse signal that rises every 07 points of the waveform, and outputs this signal from B to the PGM 9. . Since the PGM 9 stores a program for controlling the energization to the μ-tar 2 in accordance with the voltage of the commercial power supply 10 as described above, the waveform shaping circuit I5
A signal is output from C to the AND circuit Q2 in synchronization with the output of.

FIG. 2 is a time chart showing the operation of the embodiment described above. The present invention will be described in detail below with reference to the same figure.

Note that the shaded area in FIG. 1 indicates energization of the heater 2.

FIG. 2 (al is time chart 1 when the commercial power supply 10 is 100V, that is, in the case of Japanese domestic specifications).

In Japan, the voltage of the commercial power supply is AClooV, so the energization rate is assumed to be 100%. Therefore, 20M9 has 100
A program is stored in advance so that the energization rate is %, and according to this program, a pulse signal shown as p+oa is output to the AND circuit Q2.

At this time, if the output of the comparator circuit Q1 is at a high level, that is, if the temperature detected by the thermistor is lower than the set temperature, the output of the comparator circuit Q1 is at a high level, so the output of the AND circuit Q2 is at the above-mentioned pl. . This becomes a pulse signal shown as , and this signal is output to the trigger circuit 13.

The trigger circuit 13 amplifies the power of the pulse signal to drive the triac 11 and energizes the heater 2 with a waveform of the commercial power supply 10 as shown by E. In this case, the pulse signal mentioned above rises at the OV point of AClooV, so
Zero cross trigger the heater 2. AC1 like this
In the case of 00V, the heater 2 is 100% energized when the output of the comparison circuit Q is at a high level, and is stopped when the output of the comparison circuit Q is at a low level.

Therefore, the supply of electricity to the heater 2 is controlled by the temperature detected by the thermistough, thereby maintaining the above-mentioned surface temperature of the heating roll 1 constant.

FIG. 2(b) is a time chart when the voltage of the commercial power supply 10 is AC120V, that is, when the heater is energized according to the US specifications. As mentioned above, if <AC120V, turn on electricity to heater 2 at E1□. As shown in the figure, 5 out of 7 cycles were used. In addition, for even more detailed control, a 7-cycle triator 11 is turned on and off for each cycle of the AC waveform.

A program is set in advance to turn on, on, on, off, on. Therefore, p1□ according to the preset program from 20M9.

Heater 2 is used for 5 out of 7 cycles as shown below.
A pulse signal that energizes is output. At this time as well, if the output of the comparator circuit Q is high level, p1
□. The pulse 1 is output to the trigger circuit 13, which causes the trigger circuit 13 to drive the triac 11 to generate E, □
. The waveform of is applied to the heater 2. Therefore, the energization rate is set to 5/
7, even if the voltage is 120 V as described above, the average power can be made equal to that at AC 100 V.

Figure 2 (C1 is when the commercial power supply 10 is AC220V,
In other words, this is a time chart when energizing a heater for Europe. In Europe, as mentioned above, the voltage of the commercial power source is 220 cm, so the current is applied for 5 out of 24 cycles. In addition, by further subdividing this and conducting energization once in 4 cycles and energizing once in 5 cycles 4 times, that is, 1/4 once and 115 4 times, the overall result is 5/1
The PGM 9 control program is set so that the energization rate is 24. Therefore, in Fig. 2 (p2□ to c+
. A pulse signal shown as is outputted from 20M9, and the trigger circuit 13 is activated by this pulse signal. Then, the triac 1 is
1 is activated and E2□. Heater 2
energize. As a result, even if the power supply voltage is 220 cm, the energization rate is set to 5/24, so that the power consumption of the heater 2 can be made equal to that of AClooV. Also, in the case of AC220V, as mentioned above, when the output of the comparator circuit Q is at a high level, the 5/2 output from the 20M9
The trier circuit 11 is driven by a control signal that provides a current conduction rate of 4.

In addition, in the example, the voltage of the commercial power supply is 100μ, 120μ
■, 220■ has been explained as an example, but it is not limited to this, and 220■
By changing the program of 0M9, it is possible to control the energization rate to any desired value.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a waveform storage means for storing a predetermined waveform based on information of an input means for inputting information on voltage applied to a heater as a heating means, and an output of the storage means is provided. Since an energization control means is provided to control energization to the heater based on the above, the energization rate to the heater can be changed according to the voltage, thereby making the average power consumption of the heater the same regardless of the voltage. I can do it. Therefore, by changing the stored contents of the storage means according to the voltage, it is possible to use a common fixing heater regardless of the voltage in the country of use. Therefore, since the heaters can be shared, it is possible to unify the types of heaters to one type, and when there is a change in the production plan, it is possible to solve problems such as rearrangement of heaters or surplus inventory. Furthermore, since there is only one type of heater, there is no need to manage maintenance parts (service parts) by country, which simplifies the management effort.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a time chart showing the operation of the embodiment of FIG. 1, and FIG. 3 is a schematic configuration diagram of a fixing device. ■... Heating roll, 2... Heater, 3... Pressure roll, 7... Thermistor, 9... PGM (7" program memory), 10...
...Commercial power supply, II...Triac, 12...Full wave rectifier, 13...Trigger circuit, 14...Photocoupler, 15...Waveform shaping circuit, Ql...Comparison circuit, Q2. ...AND circuit, DSL, DS2...Dip switch.

Claims (1)

[Claims] A temperature control device comprising a heating means for heating a fixing device, a temperature detection means for detecting a temperature of the fixing device, and a control means for controlling the heating means based on an output of the temperature detection means, the heating means an input means for inputting information on the voltage applied to the heating means; a waveform storage means for outputting a predetermined waveform based on the information of the input means; and an energization means for controlling energization of the heating means based on the output of the waveform storage means. A temperature control device comprising a control means.