JPS58114049A - Controlling method of electric power of copying machine - Google Patents

Abstract

PURPOSE:To make the heat value of a heater larger and to copy in a short time after turning on a power source, by energizing the heater with electric power which is larger compared with that at the operational time of one of them, when at least either one of a motor and an exposing lamp is stopped. CONSTITUTION:A motor 11 and an exposing lamp 1a are energized electrically and a heater 9 is energized electrically with low electric power at the time of a large amount of power consumption. When the motor 11 is energized electrically and the lamp 1a is deenergized, the heater 9 is energized with about middle electric power. Both of the motor 11 and the lamp 1a are deenergized, the heater 9 is energized with the largest electric power. By such a way, it is prevented that the electric power consumption of the whole copying machine becomes larger inordinately. As the heater 9 is energized with the largest amount of electric power at the state the motor 11 and the lamp 1a are stopped right after loading a power source, a heat roller 7 is heated quickly and the time until its surface temp. reaches the temp. suitable for copying is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION In a static copying machine of the present invention, a first negative line energized by electric power, a second negative line energized by electric power, and a heat-energized
The present invention relates to a method for force-controlling the '+' of a copying machine, which is equipped with a heater for loading and unloading.

In the prior art, it took a relatively long time for the surface temperature of the heater heated by heat to reach a temperature suitable for heat fixing after the heat source was turned on. Therefore, it was not possible to copy quickly.

OBJECT OF THE INVENTION #i It is an object of the present invention to provide a power control method for a copying machine that can bring the copying machine into a state where copying can be performed in a short time after the power is turned on.

Figure 1 is a simplified block diagram of a copying machine in which the present invention can be implemented. The original image of the original to be copied is transferred to a photoreceptor 2 such as a drum by an exposure means IK including an exposure lamp la as a load of a power-energized Isl.
is exposed to light, thereby forming a p-electronic latent image.

This static St latent image is developed into a toner image by the developing means 3. The toner particles are transferred by the transfer means 5 onto the copy paper conveyed by the paper feed means 4. The toner image transferred onto the copy paper is thermally fixed by a thermal fixing device 6 and then discharged. Heat fixing device 6 heat roller 7 and pressure roller 8
A heater 9 is inserted into the heat roller 7. The temperature of the surface of the heat roller 27 can be measured using a temperature detector such as a boomister.
detected by O. The components for driving the second load to be energized include an exposure means 1, a photoreceptor 2,
The crotch is turned to drive the developing means 3, paper feeding means 4, heat setting device 6, etc.

1a4 of the copying machine shown in simplified form in Figure 1
FIG. 2 is a block diagram showing a jLv path. The microcomputer 13 controls the switching mode of switches 14, 15, and 16 provided corresponding to the light lamp la, motor 11, and heater 9, thereby controlling the exposure lamp la,
The motor 11 and the heater 9 are supplied with electric power from a commercial power bank @17.

The microcomputer 13 is energized by the power from the commercial text flL power supply 17.

The oysters 31 and 4 are the copying machines shown in Figures 1 and 2 of the collection.
It is a flowchart for explaining the work by llJ.

In step nl, it is determined whether the voltage of the AC power supply 17 is at a 0 cross, that is, at a zero time.

If it is a 0 cross, move to step 02 and motor ll is 1.
whether it is working or not, i.e. whether it is energized or not.
Cut off. If the motor 11 is operating, the process moves to step n3, where it is determined whether the exposure lamp la is operating, ie, energized. When both the motor 11 and the exposure lamp 1m are energized, the process moves to step n4. When the motor 11 is operating and the exposure rung la is deenergized, step n5Kl
Ill. When the motor 11 is at rest, VC moves to step n6. Memory 1 is inside the microcomputer 13.
8, and this memory 18 stores control data. In steps n4-n5 and n6, a state is reached in which the numerical values "4", [6J, and r9J can be respectively derived from the control data stored in the memory 18.

Then move on to step n7! cyclocomputer 13
The 19 decimal counter included in the AC power supply 170 is incremented by 1 from 0 to 9 every half cycle. At step n8, lO base kakunta 1
If the count value of 9 does not reach 9 and therefore no signal is obtained from 92 months, step n
Move to lG. When a carry signal is obtained from the lO base kakunta 19, the process moves to step 19, and step n4゜n
5. The heater capacitor 20 includes the control data of the memory 18 determined by n6 in the microcomputer 13.
will be transferred to.

Assume that the exposure lamp 11 is in operation and the exposure lamp la is energized, so that the numerical value "4" is selected as the control data in step n4. In this case, the heater kakunta 20Kt and the numerical value "4" are stored. The heater kakunta 20 is heated once every half cycle of the AC power supply 17.
is subtracted and decremented. This decrement operation is performed in step all. The voltage waveform applied to the heater 9 from the AC power supply 17 via the switch 16 is shown in Figure @4. If the control data is selected as the numerical value "4" in step n4, set 4
As shown in FIG. 1, five half-cycle voltages are applied to the heater 9 between time ti and t2. From time [2 to t3, the switch 16 remains cut off. In step n12, it is determined whether the temperature of the surface of the heat roller 7 detected by the temperature detector 10 is suitable for heat fixing (for example, less than 180°C. When the temperature is lower than the temperature suitable for heat fixing, &C moves to step nl 317C, and the switch 16 is turned on.The process moves from step n13 to step nl, and such operations are sequentially repeated.
As described above, the switch 16 is turned on at time tl to t2t in FIG. 4 (13), and the heater 9 is energized.

When it is determined in step n12 that the surface temperature of the heat roller 7 is at a humidity suitable for heat fixing, the process moves to step nl'4, the switch 16 remains shut off, the heater 9 is shut off, and the heat roller 7 This prevents the surface temperature from becoming unnecessarily high.

The motor 11 is operating and the exposure ramp 'l m is deenergized, so that the control data is set to the numerical value "6".
Suppose that is selected in step n5. At this point, a voltage having a waveform number shown in FIG. 4(2) is applied. The switch 16 conducts for seven half cycles of the AC power supply 17. If the motor 11 and the exposure lamp la are de-energized and 11! "9" is selected as the control data in step n6, the switch 16- is activated to the heater 9 as shown in FIG. 4 (3). A voltage having a waveform of Therefore, the switch 16 will remain conductive.

When the heater capacitor 20 is turned on every half cycle of the AC power supply 17 and the count value reaches 0, the process moves from step nIO to step n14, where the switch 16 is shut off and the heater 9 is deenergized.

In this way, Tanabata 11 and exposure lamp la are
When the heater 9 is energized with electric power and the amount of power 111 is large, the heater 9 is energized with the district electric power. Also, if Tanabata 11 is energized and the exposure lamp la is de-energized, @
In this case, the heater 9Vi is energized with a moderate force. Both the motor 11 and the exposure lamp 1 are deenergized.
When K, the heater 9 is energized with maximum power. In this way, the power consumption of the entire copying machine is prevented from increasing unnecessarily. At the same time, when the motor 11 and the exposure lamp La are at rest immediately after the power is turned on, the heater 9tf is energized with the maximum amount of power, so the heat roller 7 is rapidly heated and its surface temperature reaches a level suitable for copying. The time it takes to reach temperature is reduced.

As another embodiment of the present invention, the motor 11 may be configured to be constantly rotated when the power is turned on, and the present invention can also be implemented in connection with such a copying machine. According to the concept of the present invention, the electric power of the heater 9 is controlled to be low and high, respectively, when at least one of the d motor 11 and the exposure lamp la is in operation and when it is in rest.

In another embodiment of the invention, the first and vI2 electrically powered loads may not be the exposure lamp 1m and the motor 11, but rather the 7am motor for cooling the exposure lamp 1m and the condensation for the photoreceptor 2. It may also be a preventive heater.

In the above-mentioned embodiment, as is clear from FIG.
Although the power amount is controlled in units of half cycles of 1 to 9, as another embodiment of the present invention, as shown in FIG.
The conduction angle may be controlled by making the switch 16 conductive at ~t5 and time t6~[7. The power of the heater 9 may be controlled by -i or other configurations.

As described above, according to the present invention, when at least one of the motor and the exposure lamp is inactive, the heater is energized with electricity much more quickly than when one of them is in operation, so that the temperature of the heater for fixing is lowered. It heats up rapidly and generates a large amount of heat, so that it is ready for copying in a short time after the power is turned on. Furthermore, since the heater is not always energized with maximum power, the power consumption of the entire copying machine is prevented from increasing unnecessarily.

[Brief explanation of drawings]

Figure 1 is a block diagram of a copying machine according to an embodiment of the invention, 2
The figure is a block diagram showing the electric circuit of the copying machine shown in Figure 1, Figure 3 is a flowchart for explaining the operation of the copying machine, and Figure 4 is a waveform diagram of the voltage of the AC power supply supplied to the heater 9FC. , FIG. 5 is a waveform diagram of the voltage applied to the heater 9 in another embodiment of the present invention. l...Exposure means, la...Exposure lamp, 2...Photoreceptor, 3...Developing means, 4...Paper feeding device, 5...
Transfer means, 6... Heat fixing device, 7... Heat loaf, 8
...pressure loaf, 9...heater, 10...temperature detector, ll...motor, 13...microcomputer, 14-16...switch, 17...AC power supply agent patent attorney Kei Saikyo Part 1

Claims (1)

[Claims] The first load to be energized with power f4 and the second load d to be energized with power
lf and a heater for thermal fixing, when power is turned off in at least one of the first load direction and the second direction,
A power control method for a copying machine, characterized in that a heater is energized with a larger power than when at least one of the power is in the Z or L state.