JPH09274407A - Controller for fixing heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an adverse effect such as the flicker of a fluorescent lamp caused by the fluctuation of a power source voltage and exerted on the other electric equipment by providing a device with a control means turning on or off a fixing heater at an interval being equal to or longer than a set time so as to conduct. SOLUTION: This device is provided with the control means 4 controlling the fixing heater 2 to be turned on or off. The control means 4 is provided with a time measurement means. Then, the heater 2 is controlled to be turned on or off by an AC power source 5 based on prescribed switching processing according to the detection output of a temperature detection means 3. By the control means 4, the on/off switching processing is judged, that means, it is judged by the time signal of the time measurement means whether the previously set time elapses or not after the heater 3 is turned off. When more than the set time elapses, the temperature value of a fixing roller 1 detected by the detection means 3 is compared with a target value. When the temperature value of the roller 1 is equal to or under the target value, the heater 2 is turned on.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing heater control device for copying machines, printers and the like.

[0002]

2. Description of the Related Art A conventional fixing heater control device for a copying machine, a printer or the like has the same structure as that of the first embodiment of the present invention, and will be described with reference to FIG. It is installed in the fixing roller 1 and the fixing roller 1, and
A fixing heater 2 that heats the fixing roller 1, a temperature detecting unit 3 that detects the temperature of the fixing roller 1, and a control unit 4 to which the output of the temperature detecting unit 3 is input are provided so as to approach the preset target temperature as much as possible. In addition, the control means 4 changes the phase control angle or switches on and off according to the output of the temperature detection means 3 by on / off control or phase control of energization from the AC power source 5 to the fixing heater 2. Is something that is often done.

[0003]

In the conventional fixing heater control device as described above, in order to maintain the temperature of the fixing heater at a predetermined temperature, the energization control is switched on and off and the phase control angle is controlled. Changes are made frequently, and the power supply voltage fluctuates each time this is switched on or off, or the phase control angle is changed, which adversely affects other electric devices such as flicker of fluorescent lamps, and the adverse effects thereof are caused. There is a problem of being expensive.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the problems of the conventional fixing heater control device as described above, and to generate a power supply voltage each time the fixing heater energization is switched on / off or the phase control angle is changed. It is an object of the present invention to provide a fixing heater control device capable of reducing adverse effects on other electric devices such as flickering of a fluorescent lamp caused by fluctuation.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a fixing heater control device for controlling on / off of energization of a fixing heater. , OFF switching is provided with a control means for energizing the switch at intervals of a set time or longer. According to a second aspect of the present invention, in the fixing heater control device for phase-controlling the energization of the fixing heater, there is provided a control means for energizing the change of the phase control angle at a set time or longer. It is a thing. According to a third aspect of the present invention, there is provided a fixing heater control device that controls on / off control or phase control of energization of a fixing heater to set a fixing temperature to a predetermined temperature. A control means for changing the width of the predetermined temperature to control the energization is provided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 showing an embodiment of the present invention, the same parts as those in the prior art will be designated by the same reference numerals, and the description thereof will be omitted. In the first embodiment of the present invention shown in FIG. 1, a fixing roller 1, a fixing heater 2, a temperature detecting means 3 for detecting the temperature of the fixing roller 1, and a control means for controlling ON / OFF of energization of the fixing heater 2. 4, the control means 4 is provided with a time measuring means, the temperature detecting means 3 uses, for example, a thermistor, and the control means 4 receives the detection output of the temperature detecting means 3 and responds to the output. Then, the on / off control of the energization from the AC power source 5 to the fixing heater 2 is performed based on a predetermined switching process.

The operation flow of the first embodiment is as shown in FIG. 2. In the state where the energization control of the fixing heater 2 is started (step 2-1), the control means 4 switches the preceding ON / OFF. The process, that is, whether or not a preset set time has elapsed since the previous energization was turned off is determined by the time signal of the time measuring means (step 2-
2) If the set time or more has not elapsed (step 2
-2; No), the process returns to step 2-2 again and remains off (non-energized) until the set time or more elapses. On the other hand, when the set time or more has elapsed (step 2-2;
s), the fixing roller 1 detected by the temperature detecting means 3
When the temperature value of the fixing roller 1 is less than or equal to the target value (step 2-3; Yes), the energization of the fixing heater 2 is turned on (step 2-4). On the contrary, when the temperature value of the fixing roller 1 is equal to or higher than the target value (step 2-
3; No) (step 2-3; No), the energization of the fixing heater 2 is kept off (step 2-5). When the fixing heater 2 is switched on and off (step 2-6; Yes), the timer of the time measuring means is reset (step 2-7) and step 2-2.
Return to

In such a case, the energization of the fixing heater 2 can be switched over by a predetermined time or more between the preceding OFF operation and the subsequent ON operation.
It is possible to reduce the number of adverse effects such as the flicker of a fluorescent lamp on other electric devices due to fluctuations in the power supply voltage each time the power switch is turned on and off because the power supply voltage is not repeatedly turned on and off.

In the second embodiment, instead of the control means 4 of the first embodiment for performing on / off control of the fixing heater 2, energization of the fixing heater 2 is performed by phase control. Such control means 4 changes the subsequent energization phase control angle, if necessary, after a lapse of a set time or more from the preceding energization phase control angle change.

The operation flow of the second embodiment is as shown in FIG. 3, and when the energization control of the fixing heater 2 is started (step 3-1), the control means 4 changes the preceding phase control angle. Is determined by the time signal from the time measuring means (step 3-2),
If the set time or more has not elapsed (step 3-2;
No), returning to step 3-2 and energizing without changing the phase control angle until the set time or more elapses. On the other hand, if the set time or more has elapsed (step 3-2; Yes), the temperature detection means The temperature value of the fixing roller 1 detected by 3 is compared as a target value. If the temperature value of the fixing roller 1 is less than or equal to the target value (step 3-3), the energization phase control angle of the fixing heater 2 is reduced. On-duty of the fixing heater 2 is increased (step 3-4). Conversely, when the temperature value of the fixing roller is equal to or higher than the target value (step 3-3), the energization phase control angle of the fixing heater 2 is increased. The on-duty of the fixing heater 2 is reduced (step 3-5). When the temperature value of the fixing roller 1 is equal to the target value (step 3
-3), The on-duty of the fixing heater 2 is not changed while keeping the energization phase control angle of the fixing heater 2. When the phase control angle of the fixing heater 2 is changed (step 3-6; Yes), the timer of the time measuring means is reset (step 3-7) and the process returns to step 3-2.

In such a case, the change of the phase control angle of the fixing heater 2 can be performed with respect to the change of the preceding phase control angle by a predetermined time or more before the change of the next phase control angle. Therefore, it is possible to reduce the number of adverse effects such as flicker of fluorescent lamps on other electric devices due to fluctuations in the power supply voltage each time the phase control angle is changed, because the phase control angle is not repeatedly changed. You can

The third embodiment differs from the first embodiment in that
The control means 4 is provided with a storage means, and in this storage means, the temperature of the fixing roller 1 in the residual heat mode where the set temperature is low and there is no need for precise temperature control, the temperature of the fixing roller 1 in the normal standby, and the normal standby. The temperature of the fixing roller 1 at the time of copying, which is required to be more precise than the above temperature, and the data of the predetermined temperature range of the fixing roller 1 which is appropriate depending on the quality of the paper used and the conditions such as color copying, are input. Is to select and change the width of the predetermined temperature based on the above-mentioned data in accordance with the operation command signal corresponding to each state, and to control the energization of the fixing heater 2 based on this temperature width. Such control may be applied to the second embodiment.

The operation flow of the third embodiment is as shown in FIG. 4, and when the energization control of the fixing heater 2 is started (step 4-1), the control means 4 performs the fixing operation as described above. From the corresponding set temperature, the operating conditions, etc., the lower and upper limit values of the target suitable temperature of the fixing roller 1 are obtained (step 4-2), and then the temperature value of the fixing roller 1 is the lower limit value of the target temperature. In the following cases (Step 4-3;
Yes), increase the electric power supplied to the fixing heater 2. That is, in the case of ON / OFF control, the ON process of the fixing heater 2 is executed, and in the case of phase control, the energization phase control angle of the fixing heater 2 is reduced and the ON duty of the fixing heater 2 is increased. When the temperature value of the fixing roller 1 is equal to or higher than the lower limit value of the target temperature (step 4-3; No), the energization is continued as it is, and after the above processing, the temperature value of the fixing roller 1 is equal to or higher than the upper limit value of the target temperature. If (step 4-5; Yes),
The electric power supplied to the fixing heater 2 is reduced. That is, in the case of on / off control, the fixing heater 2 is turned off, and in the case of phase control, the energization phase control angle of the fixing heater 2 is increased and the on-duty of the fixing heater 2 is decreased. When the temperature value of the fixing roller 1 is equal to or lower than the upper limit value of the target temperature (step 4-5; No), the energization is performed without changing the condition of the preceding energization control (ON, OFF control, or phase control). When the above process is completed, the process returns to step 4-2.

In such a case, the energization control of the fixing heater 2 is performed by changing the width of the predetermined temperature of the fixing roller 1 in accordance with the set temperature of the fixing roller 1 and the operating conditions. If the temperature of the fixing roller 1 can be set to a desired value and the fixing roller 1 is in an operating condition that requires precise temperature control, the target temperature width is set to be small so that the temperature of the fixing roller 1 is In the case of an operating condition where precision is not required, the target temperature width is changed to a large one to control the temperature, so the frequency of on / off switching of the fixing heater 2 and the change of the phase control angle is reduced. When the set temperature is low in the residual heat mode and the precise temperature control of the fixing roller 1 is not required, the target temperature range can be further increased and the power supply voltage can be increased as compared with the conventional one. Is more variable Hesi, it is possible to reduce the adverse effect such as flickering of the fluorescent lamp, the other electrical equipment.

[0017]

The present invention is as described above, and in the invention described in claim 1, the fixing heater control device for controlling the energization of the fixing heater is turned on and off is set to be turned on and off. Since the control means for energizing at a time interval or more is provided, the fixing heater can be switched on / off at a set time interval or more, and the frequency of on / off switching can be reduced as compared with the conventional technique. This also reduces the frequency of fluctuations in the power supply voltage, reduces the adverse effects on other electric devices such as flicker of fluorescent lamps, and improves the working environment.

According to the second aspect of the present invention, in the fixing heater control device for phase-controlling the energization of the fixing heater, the control means is provided for energizing the change of the phase control angle at a set time or more. Since the change of the phase control angle of the fixing heater can be made longer than the set time, the frequency of change of the phase control angle is reduced and the frequency of change of the power supply voltage is reduced as compared with the conventional technique. This has the effect of reducing adverse effects on other electric devices such as flickering and improving the working environment.

According to a third aspect of the present invention, in the fixing heater control device for controlling the on / off control or the phase control of the energization of the fixing heater to bring the fixing temperature to a predetermined temperature, the set temperature of the fixing temperature, the operating condition, etc. In order to control the energization by changing the width of the predetermined temperature in response to the above, the frequency of fluctuations in the power supply voltage decreases, especially when a precise fixing roller temperature is not required Flicker of lights, etc.
This has the effect of reducing adverse effects on other electric devices and improving the work environment.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a first embodiment of the present invention.

FIG. 2 is a flowchart of the first embodiment of the above.

FIG. 3 is a flowchart of the second embodiment of the above.

FIG. 4 is a flow chart diagram of a third embodiment of the above.

[Explanation of symbols]

 1 fixing roller 2 fixing heater 3 temperature detection means 4 control means 5 AC power supply

Claims (3)

[Claims] 1. A fixing heater control device for controlling on / off of energization of a fixing heater, characterized by comprising a control means for energizing the on / off switching at a predetermined time interval or more. Control device. 2. A fixing heater control device for phase-controlling the energization of a fixing heater, wherein the fixing heater control device is provided with a control means for energizing the change of the phase control angle at an interval of a preset time or more. . 3. A fixing heater control device for turning on / off or controlling a phase of a fixing heater so as to set a fixing temperature to a predetermined temperature, wherein a predetermined temperature corresponding to a set temperature of the fixing temperature and an operating condition is set. A fixing heater control device characterized in that a control means for changing the width to control the energization is provided.