JPS5814848A - Controller for electric power economization of electrophotographic copier - Google Patents

Abstract

PURPOSE:To reduce the electric power to be supplied to a heat source and a driving power source by half to economize electric power and to display the state of the half economized power and the fully economized power by a display means simultaneously upon lapse of a constant time after the end of copying. CONSTITUTION:Upon ending of copying operation, a copying operation signal (r) goes to an ''L'', and a flip-flop F/F is held reset, the output (e) thereof is an ''L''. Therefore, the output (g) of an OR gate U7 goes to an ''L'' and the presetting of the 1st timer T1 is released, then a timer T1 starts clocking. When the 1st timer T1 clocks a prescribed time, for example, 1min, it times up and the output (h) thereof is turned to an ''H''; at the same time, the 2nd timer T2 starts clocking, thus reducing the supply electric power by half. At the same instant, a transistor Tr1 conducts, and a relay RL1 and a power economization lamp L1 go on, thereby displaying power economization. Further, a start prohibition signal is outputted, so that the subsequent restarting is prohibited and the full power economization is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power saving control device for an electronic copying machine aimed at reducing power consumption.

Generally, electronic copying machines consume a large amount of power due to heat sources such as a fixing device and power from an air cooling fan.

Conventionally, power is saved by automatically turning off the power after a certain period of time has passed after copying, or by using a timer to turn the power on and off for a certain period of time. There is a problem in that it takes time for the fusing device to reach the fusing temperature when making the first copy because the power is turned off even when not in use within the set time, so the power saving effect is not expected. There was a problem that I couldn't do it.

This invention was made with the aim of improving this problem, and the first timer starts counting when copying is completed, and when a predetermined period of time is counted, the first timer reduces the power supplied to the heat source, electric motor, etc. start,
To provide a power saving control device for an electronic copying machine, which has a second timer that automatically cuts off the supply of power to a heat source, electric motor, etc. when time-up occurs, thereby making it possible to save power without interfering with copying operations. It is something.

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the circuit of this invention device installed in an electronic copying machine (not shown). This circuit will be explained below along with its operation. The paper tray selection switch S and the power saving set switch S are both turned off, and charging of the capacitor C1 connected to the input of the Nantes gate U starts when the power is turned on. One input d of U becomes "L", thereby the output becomes "H", and therefore the output 5 of NOR gate U6 becomes "
The flip-flop F/F is set, and the output e becomes "H". At this time, the flip-flop F
/F's reset manual power r is the inverted version of the copying machine operation signal r, which is "H". OR gate U is generated by the output "H" of the flip-flop F/F.

The output t of T becomes "H", and the first timer T is thereby preset, but time measurement does not start.

The output of the first timer T holds rLl. This first
Timer T1 has finished presetting and signal 1 is “L”
When this occurs, time counting is started, and after the time-up, the output is kept at "H", and the output returns to "L" at the next preset input.The circuit and operation will be described later. Since the output of the first timer T is "L", the transistor Tr is in an off state, so the relay R and the half power saving pump connected to the collector side of the transistor Tr are both off. is in a state of Also, the first timer T.

The output "L" signal is inverted to "H" by the inverter and input as a signal to the second timer T, and the second timer T is also preset, but does not start timing. lJ
2, the output of the timer T holds "LJ", and this signal is inverted by the inverter U through the contact kA of the switch S4, becomes "H", and is input to the Nant gate U.

On the other hand, flTR, F! , is a heat source provided in the fixing device (not shown), to which AC power is applied via the normally open contact Rmu1 of relay RL, and a temperature detector TH, such as a samister, is located near the heat source ETR,. It is provided. When the power is turned on, the temperature of the heat source HTR is low, so the internal resistance of the temperature detector T is relatively large, and the voltage at the y section is higher than the reference voltage X generated by the resistors R, RI. Output of comparator U, m114. [It becomes HJ, and due to the "H" in the signal, the output of the AND gate Buddha is "
H'1 This makes the transistor Tr- conductive and the relay R
L is turned on, and power is applied to the heat source HTR through the normally open contacts 7u and 4't of the relay.

Heating by the heat source 11TR has started, and the copy 1m looks like a warm bag! Become I. When the fixed* device reaches a fixing temperature due to heating by the heat source MTR1, the internal resistance of the temperature detector TH, which detects this, decreases to the voltage reference voltage X of the y section, and the output of the comparator U. The door is
At the same time, the output signal of AND gate U becomes "L" and can be copied via inverter U. At the same time, the signal "H" is output, and the output of AND gate U becomes "L" and the transistor Tr and relay R are output. is turned off, and the supply of power to the heat source HTR is stopped. Thereafter, the heat source 11TR is maintained at a constant temperature by repeating an operation in which the heat source 11TR is turned on when the temperature drops and turned off when the specified temperature is reached.

Also, while the ready signal m is output, it is in "standby mode", and during this time, each of the switches S, ,
Turn on S, , S, etc. to turn on this flip-flop F/
F maintains the previous state, so the second timer T, T
, both maintain the preset state.

Next, in order to start copying in the standby state, the copy start switch C (not shown) is turned on.

The operation signal r-'fJ is generated from the copying machine control system, and the flip-flop I'/F is reset by the inverted signal r of this signal r, so that the output signal 6 becomes 'L', and the inverted signal r becomes 'H'. It is also input to the OR gate U. As a result, the output 2 of the OR gate U is also "H" and the first timer T
I maintains the preset state during the copying operation. When the copying operation is completed, the copying operation signal r becomes "L", so that the signal rFi "HJ" and the flip-flop F/F remain reset, and their output - is "L". Therefore, the output V of the OR gate becomes "L", the preset state of the first timer T is released, and the first timer T starts counting time. Furthermore, if the copying machine is left in this state, there is of course no input from each switch S, ~S, so the flip-flop F/F maintains the reset state and the first timer T is set for a predetermined period of time, e.g. When the minute is counted, the second timer T starts counting at the same time as the time is up and the output A becomes 14J. When the output of the first timer T is "H", the transistor Trl becomes conductive, the relay RL and the power saving lamp L1 are turned on, and a power saving display is performed by the power saving random, and at the same time, the start prohibition signal P is output, and from then on, restart is prohibited.

Due to the "H" output of the single power tube 1 timer T, the output t of the Natgate Buddha becomes "L", and the 1 power saving medium capacity switch S, ,
Even when S is turned on, the flip-flop F/F is not set, and when the relay R is turned on, the normally open contacts RL1-2 of the relay R are opened, and the resistor R8 is connected to the resistor R1.
are connected in parallel and the reference voltage X is increased by that amount,
Hereafter, the heat source 11TR is a point higher than the internal resistance of the temperature detector TH.

That is, it is controlled at a temperature lower than the fixing temperature, and the heat source 11T
The power supplied to R can be reduced. Furthermore, if the power saving state is maintained, and there is no input from the power saving reset switch S during that time, and the first timer T, the second timer T1 times out for a longer time, for example, 5 minutes, and the second timer 8 times out, the second timer T1 times out. The output k of T- becomes "H". At this time, if the total power saving prohibition switch No. 5 is turned on, the transistor Trm becomes conductive and the total power saving ransom is turned on.
A full power saving display is displayed, and the signal includes an inverter U.
, it is inverted to signal K and input to the AND gate.

This results in ANDGATE U.

Since the voltage becomes "L" and the transistor Tr becomes non-conductive and the relay RL is turned off, the normally open contacts RL and J of the relay are also turned off and the heat source HTR is turned off.

The power supply to the device will be stopped and the device will go into full power saving mode.

As shown above, when a certain period of time (for example 1 minute) has passed after the end of one shot, the power supply to the heat source MTR is automatically reduced to a half power saving state, and if there is no input for 5 minutes after that, the power is automatically turned off. Heat source HTR.

When the power supply is stopped and the state shifts to full power saving mode, the half power saving lamp L1 lights up during half power saving mode.

When all power is being saved, all power saving ransoms are lit to display the respective power saving status.

Next, when copying is to be performed in the above-mentioned semi-power-saving state, the power-saving reset switch S is turned on. As a result, all inputs to the Nant gate U become "L", and the output becomes "H".
, Therefore, the output S of the NOR gate U becomes "L", the flip-flop F is set, the output e becomes "H", and the output V of the OR gate becomes "H". As a result, the first timer T is preset and only the output becomes "L".

Since the transistor Tr becomes non-conductive and both the relay R and the half-power-saving pump are turned off, the half-power-saving state is canceled. Further, the signal of the first timer T1 is inverted and becomes "H", and the second timer T is preset by this signal "H".

The output k of the second timer T becomes "L" and the output of the AND gate U becomes "f", the transistor Tr becomes conductive, and the relay RL is turned on. As a result, power is applied to the heat source 11TR, and heating starts, and at this time, since the relay RL is turned off as described above, the heat source 1rrR is connected to the resistor R,, R,
It is controlled based on the reference voltage X set in . That is, it is heated to a normal fixing temperature and thereafter controlled to be constant.

Furthermore, since the heat source HTR starts heating from a low power supply state, it reaches the fixing temperature in a shorter time than one normal warm-up time, thereby preventing a drop in copying efficiency.

On the other hand, when the first power saving reset switch S is turned on to start copying from the full power saving state, the first timer T,
is preset and the output becomes "L", h becomes "H" and the half power saving lamp L goes out, and when h becomes "H", the second timer T is preset and the output k becomes [J, A]. becomes rHJ and the output becomes "L", transistor 7'rA becomes non-conductive, all the power-saving ransoms go out, and the current r[J
Then, the voltage of AND gate U becomes 14 J, transistor Tr1 becomes conductive, relay RL is turned on, and power is applied to heat source HTR, as in the half power saving mode. However, when copying from a full power saving mode, all power to the heat source is turned off, so once the heat source has completely cooled down, it will take the longest warm-up time to reach the fixable temperature. This is a full power saving lamp L,
This can be easily determined from the fact that copying starts when the lamp lights up.

And once power saving is reset.

Rounding where flip 70 knob F/F is set.

The next power saving is carried out when the operation signal r is input.
This occurs after the flip-flop F/F is reset. Furthermore, if the copy number setting switch SL, etc. is turned on after the operation signal τλ is applied and before the first timer T times out,
The output of the Nant gate becomes 14j, the output ♂ of the Noah gate becomes "L", and the flip-flop F/F is set, but even if it is left alone after that, the first. Second timer T, ,
In order to maintain the preset state for both T and T, no time measurement is performed, and each switch 51 to S is operated to start copying] 11) Copying is interrupted to replenish paper. However, since the power saving mode is not automatically entered, there is no need to operate the switches S, -S, etc. again after replenishing paper.

It should be noted that if the above-described operation is made into a time chart, it will be as shown in FIG. 3. Also number 1. Second timer T, , T
As I, the one shown in FIG. 2 can be used. In other words, when the preset signal q becomes "H", the transistor T
r, conducts to discharge the potential charged in the capacitor C8.

Comparator U. One input becomes "L", the reference voltage 2 set by the resistor &, R7, becomes large, and the output of the comparator U16 becomes "H", and this output is inverted by the inverter U, and becomes "L". becomes. When the presetting of the timer T or T is completed and the signal q becomes "L", the transistor Tr becomes non-conductive and the capacitor C
, and when the terminal voltage becomes higher than the reference voltage, the output of the comparator U1° becomes "L" and the 1 inverted signal rHJ is output. The output of this timer Cl2) is held until the next time the reset signal q becomes "H". That's the first thing. Second timer T, ,T.

However, the circuit is not limited to the above-described circuit as long as it has a similar function.

The total power saving prohibition switch S4 provided on the output side to the ninth timer 2 is a switch that prohibits automatically entering the total power saving mode. By turning this off, even if timer 8 times out, .

Signal K does not become I'4J, so no total power saving is performed. That is, in a frequently used copying machine, the switches S and f should be turned off.

This will allow you to achieve both shortening of waiting time and half-power saving. Furthermore, by similarly providing a switch on the output side of the first timer T, it is possible to prohibit automatic entry into half power saving mode.

Furthermore, in the above embodiment, the logic circuit and CR timer allow
The entire structure was constructed using a microcomputer.
It is also easy to obtain a similar function using software, and in this case, an accurate lock signal can be used, which improves control accuracy. Furthermore, in the above embodiment, a case was explained in which the power supplied to the heat source of the fixing device was saved.
It can also be applied to the power that drives cooling fans and other heat sources.

Furthermore, in the above embodiment, the comparator U,
Although we changed the reference voltage X input to the By using control and phase control, more accurate temperature and power control becomes possible.

In addition, in the case of displaying the number of sheets, tray selection, paper size, etc. by the power saving Ransom, L, it is better to turn off the light during power saving, and this can be easily implemented using only logic circuits. Furthermore, when resetting the power saving area, the saving area is increased.

It is also possible to turn off the system and turn on other signals based on the copy start signal, but in this case, the change point from "H" to "L" is detected and copy parameters such as number of copies set and density selection are set to standard values. , for example, it can be cleared to "1". Further, in the above embodiment, the first. Although the second timers T, , and TI are connected in series and operated, it is of course possible to operate them in parallel.

As described in detail above, this invention automatically reduces the power supplied to the heat source, power source, etc. by half after a certain period of time has passed after copying is completed, and automatically enters a half-power saving state. A: In addition to reducing power consumption compared to copying machines, when copying starts from a half-power-saving state, it becomes ready to copy in a short time, reducing waiting time and improving work efficiency. You will be able to improve your skills. Furthermore, by reducing the power supplied to the heat source, power source, etc., the heat source is prevented from overheating and the power system is not worn out unnecessarily, so that the durability of the copying machine itself can be improved. Moreover, since the half power saving and full power saving status can be easily read by the display means, it is estimated that the ohm-up time until copying is possible is 1A.
% work efficiency can be improved, and at the same time, frustration and frustration during waiting time can be eliminated.

(15)

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, FIG. 81 is an overall circuit diagram, FIG. 2 is a circuit diagram of a timer, and FIG. 3 is a timing chart showing the operation. Tl1i is the first timer, T- is the second timer. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto (16)

Claims (1)

[Claims] a first timer T1 that measures a certain time t after the copying operation of the copying machine body ends and outputs a power supply reduction signal to the power supply element upon time-up; and a longer time 1' for the time t measured by the first timer T1 , and a second timer T that outputs a power cutoff signal to the power supply element upon time-up; means for displaying a power saving mode in response to a power reduction signal output from the first timer T1; 2
A power saving control device for an electronic copying machine, comprising means for displaying all power saving modes in response to a power cutoff signal output from a timer T3.