JPS5814849A - Controller for electric power economization of electrophotographic copier - Google Patents

Abstract

PURPOSE:To resume a copiable state in a short time by reducing the electric power to be supplied to a heat source and a driving power source upon lapse of a constant time after the end of copying to economize electric power by half automatically and supplying fully electric power when the copying is restarted. CONSTITUTION:When the operator turns a power economization reset switch S3 to start copying from a half power economization state, the output (e) of a multi-F/F goes to an ''H'' and the output (g) of an OR gate U7 goes to an ''H''. Therefore, the 1st timer T1 is preset, the (h) goes to an ''L'', a transistor Tr1 is made non-conducting, and a relay RL1 and a half power economization lamp L1 go off to release the state of the half economization, by which full electric power is supplied. The copying is restarted in a short time by such constitution of changing the half power economization to the full power supply.

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, but with the former method, when the power is turned off, heat sources such as the fixing device are also used. Since the fuser is turned off, there is a problem that it takes time for the fixing device to reach the constant M temperature the next time you copy.With the latter method, the power is turned on 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 for the purpose of improving such a problem, and includes a first timer that starts timing when copying is finished and reduces the power supplied to the heat source, electric motor, etc. when a predetermined time has been counted, and when the first timer times up. Provided is a power saving control device for an electronic copying machine, which has a second timer that starts timing and automatically cuts off the supply of power to a heat source, electric motor, etc. when the timer expires, thereby saving power without interfering with copying operations. This is how it was done.

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a 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 feed tray selection switch S and the power saving set switch S are always off when the power is turned on, and charging of the capacitor C3 connected to the input of the Nant gate U starts when the power is turned on. One of the inputs d of the Nand gate U is rLJ, so the output j is "H", so the output 8 of the Noah gate U6 is rb.
J, the 7 lip-flop F/P is set, and the output θ becomes "H". At this time, the flip-flop P'
/, the glue set input r is the inverted version of the copying machine operation signal r and is "H".

Due to the output "H" of the flip-flop /F, the output V of the geoagate U becomes rHJ, and thereby the first timer T is preset, but time measurement does not start. The output of the first timer TI holds rJ. This first timer T1
starts counting when the preset is completed and the signal t becomes "L", and after time-up, the output is held at ruJr, and the output returns to rJ at the next preset input.The circuit and operation will be described later.

Since the output of the first timer TI is rLJ, the transistor Tr1 is off, and therefore the relay RL connected to the collector side of the transistor Tr and the half power saving lamp L1 are both off. It is in. In addition, the rLJ signal output from the first timer T is output by the inverter U.
H'' is inverted and input to the second timer T as a signal 1, and the second timer T2 is also preset, but time measurement does not start. The output of the second timer T holds rLJ, and the signal is sent to the switch 8. The signal F, which is inverted by the inverter U through the contact, becomes "H" and is input to the Nant gate U.

On the other hand, HTR is a heat source provided in the fixing device (not shown), to which AC power is applied through the normally open contact RLI of relay RL, and a temperature detector such as a samister is placed near the heat source HTR. TH, is provided. When the power is turned on, the temperature of the heat source H'l'R, is low, so the internal resistance of the temperature detector TH, is relatively large, and the voltage at the y section is higher than the reference voltage X generated by the resistor R8, 几. Therefore, the output m of the comparator U1 becomes "H", and due to the rnJ of the signal V, the output n of the AND gate U becomes "H", which makes the transistor Trll conductive and the relay RL.

is turned on, and the normally open contact R of the heat source HTR and relay RL is turned on.
Power is applied through L*-1k, heating by the heat source HTR is started, and the copying machine enters the warm-up state.

When the fixing device reaches a fixable temperature due to the heating pressure generated by the heat source HTR, the internal resistance of the temperature detector TH, which detects this, also decreases, and the voltage at the y section also decreases to the reference voltage X, and the comparator U, The output m of the AND gate U becomes rJ, and rHJ of the ready signal m is outputted via the inverter U9, and at the same time, the output n of the AND gate U becomes rhJ, and the transistor Tr and the relay RL, is turned off, and the supply of power to the heat source HTR1 is stopped. From now on, the heat source H'r
R.

When the temperature drops, the power is turned on, and when the specified temperature is reached, the power is turned off, repeating this process to maintain a constant temperature.

Also, while the reso signal lightning is being output, it is in "standby mode", and during this time each of the switches 81 *
Even if 8@, 81, etc. are turned on, the flip-flop /, maintains its previous state, so the first . Second timer T. T,
Both will maintain the preset state.

Next, when a copy start switch (not shown) is turned on to start copying in the standby state, an operation signal r=rHJ is generated from the copying machine control system, and an inverted signal 7 of this signal r is used to switch the Schiffritz flop. 2 is reset, the output signal e becomes rJ, and the OR gate U is output along with the inverted signal r to "H".

is input to. Due to this, Orgate U? The output f is also “
At "H", the first timer T maintains the preset state during the copying operation. When the copying operation is completed, the copying operation signal r becomes "L".
p, so the signal f is [January 7 lip-flop 1
4 remains reset and its output e is [,J. Therefore, the output f of the OR gate U becomes rJ, and the preset state of the first timer T is canceled, and the first timer T,
starts timing. Also, if the copying machine is left in this state, the switches S and -S will suddenly go off.

Since there is no input from the flip-flop 4, the flip-flop 4 maintains the reset state, and when the first timer T1 measures a predetermined time, for example, 1 minute, the time-up occurs and the output 11 is set to ruJ.
At the same time, the second timer T starts measuring time. Due to rHJ of the output of the first timer Tt, the transistor Tr
, conducts, relay RL and power saving lamp L1 turn on,
At the same time as the power saving lamp L displays the power saving display,
A start prohibition signal P is output, and subsequent restarts are prohibited.

The output 1 of the Nantes gate U3 becomes ``Ll'' due to the output ``H'' of the single power cylinder 1 timer T, and the power saving medium capacity switch S,
, S is turned on, the flip-flop 5 is not set, and the relay RL is turned on, so that the relay R is turned on.
Normally open contact RL1-1 of L is closed, resistor R8 is connected in parallel to resistor R1, and reference voltage X is increased by that amount, so that from now on, heat source HTR, is higher than the internal resistance of temperature detector TH, point, that is, controlled at a temperature lower than the fusing temperature,
The power supplied to the heat source HTR can be reduced.

Further, the power saving state is maintained, and during that time there is no input from the power saving reset switch 8s, and the second timer T! is longer than the first timer T1, for example, for 5 minutes. When the second timer T times out, the output k of the second timer T becomes rHJ.

At this time, if the total power saving prohibition switch S is turned on, the transistor TrB becomes conductive, the total power saving lamp L2 is lit, the total power saving display is performed, and the signal is inverted to the signal V by the inverter U, and It is input to gate U2. As a result, the output n of the AND gate U becomes "L", the transistor Trl becomes non-conductive, and the relay RL
, is turned off, the normally open contact RL, -1 of relay RL, is also turned off, and the supply of power to the heat sources HTR, PE is stopped, resulting in a full power saving state.

As mentioned above, when a certain period of time, for example 1 minute has passed after copying is completed, the power supply to the heat source HTR is automatically reduced to a half power saving state, and furthermore, if there is no input for 5 minutes after that, automatically Heat source HTR.

The power supply to the device is stopped and the device enters a full power saving state.When half power is being saved, the half power saving lamp L is displayed.

However, during full power saving, the full power saving lamp L is lit to display each power saving state.

Next, when copying is to be performed in the above-mentioned semi-power saving state, the power saving switch S3 is turned on. As a result, all inputs of Nantes gate U5 become "L", output j becomes "H",
Therefore, the output 8 of the NOR gate U6 appears as rJ, the flip-flop 14 is set, the output e becomes "H", and the output f of the OR gate U7 becomes "H". As a result, the first timer T is preset, the output becomes rJ, the transistor Trl becomes non-conductive, and both the relay BL and the half-power saving lamp L1 are turned off, so that the half-power saving state is canceled. . Also, the first timer T.

The output of 1 is inverted and becomes 5, and the second timer T is preset by the high level of this signal.
, the output k becomes "L" and the output "H", and the AND gate U! The output n of rHJ is a transistor Tr.
y is made conductive and VRL2 is turned on. As a result, power is applied to the heat source HTR, to start heating, and at this time, as described above, the relay is turned off, so the heat source HTR is connected to the resistor R1*TL! It is controlled based on the reference voltage xf 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, the fixing temperature is reached in less than a normal warm-up time, thereby preventing a drop in copying efficiency.

On the other hand, when the power saving reset switch S3 is turned on to start copying from the full power saving state, the first timer TI
is preset, the output becomes rr, J and h become ruJ, and the half power saving lamp L1 goes out.
Timer T is preset, output k becomes rr, J and Y become "H", transistor 〒r8 becomes non-conductive due to rJ at the output, and all power saving lamps L! goes out, and V
f''nJ, the output n of the AND gate U becomes ruJ, the transistor Tr2 becomes conductive, and the relay RL turns on.
Power is applied to the heat source HTR1 in the same way as in half power saving mode.However, when copying from full power saving mode, all power to the heat source is turned off, so if the heat source has completely cooled down, it will take the longest warm-up to reach the fixing temperature. It takes time. This can be easily determined from the fact that copying starts when all the power saving lamps L, are turned on.

Once the power saving is reset, the flip-flop 2 is set, so the next power saving is performed after the operation signal r is input and the flip-flop 14 is reset.

In addition, if the copy number setting switch S is turned on after the operation signal r is input and before the cylinder 1 timer T times out,
The output 1 of the Nant gate U becomes "H" and the output 8 of the Noah gate U6 becomes "L" and the flip-flop % is set. Second timer T1*T
1. In order to maintain the preset state in both cases, there is no time measurement (11), so even if copying is interrupted to replenish paper at the stage when each switch 81 to 8tf is operated to start copying, Since the power saving mode is not automatically entered, there is no need to operate all the switches S, -SB, etc. again after replenishing paper.

The time chart of the above-described operation is shown in FIG. 3. Also number 1. As the second timers T, , T, one shown in FIG. 2 can be used. In other words, if the preset signal V is "In January, the transistor Tr,
conducts and discharges the potential charged in the capacitor C7, so one input of the comparator Ulo becomes "L", the reference voltage 2 set by the resistors R6r R7+几 increases, and the output of the comparator UIO becomes " H”,
This output is inverted at innogu-2tJst and becomes rJ. When the presetting of the timer T or T is completed and the signal i becomes rJ, the transistor Tr4 becomes non-conductive and starts charging the capacitor C3, and the terminal voltage becomes higher than the reference voltage (12). , when the output of the comparator UIo is "L", an inverted signal "H" is output. This timer output is held until the next time the reset signal f becomes "H". The above is the first
．． The operation of the second timers T, , T, is of course not limited to the circuit described above as long as it has a similar function.

Also, a total power saving prohibition switch 8 provided on the output side of the second timer T. is a switch that prohibits automatic entry into all power saving modes, and by turning it off, the timer T
Even if t times up, the signal k does not go to "H" and therefore no power saving is performed. That is, in a frequently used copying machine, by turning off the switch S, it is possible to obtain both the effects of shortening the waiting time and saving power by 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 CB 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 the reference voltage xf input to the Control and phase control]'(r) allows more accurate temperature control and power control.

In addition, the display using the power saving rungs L, , L, for displaying the number of sheets, tray selection, paper size, etc., is preferably turned off during power saving, and can be easily implemented using only logic circuits. Furthermore, when resetting the power saving, the power saving lamp L++Lt'e can be turned off and other signals can be turned on by the copy start signal, but in this case, the change point from "H" to "IJ" is detected to set the number of copies and select the density. It is also possible to clear the copy parameters such as ``I'' to the standard value, for example [A].

In the above dignified embodiment, the first. Second timer Ti.

T, are operated by connecting them in series, but 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. In addition to reducing power consumption compared to some copying machines, when copying starts from a half-power-saving state, it can be ready for copying in a short time, reducing waiting time and improving work efficiency. will be able to achieve this. Furthermore, by reducing the power supplied to the heat source, power source, etc., the heat source will not overheat and the power system will not wear out unnecessarily, making it possible to improve the durability of the copying machine itself. Moreover, since the power saving mode can be canceled and the normal mode can be returned immediately, the same problem will not occur even if the copier is used frequently (15).

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an overall circuit diagram, FIG. 2 is a timer circuit diagram, and FIG. 3 is a timing chart showing the operation. T is the first timer, and 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 T that measures a certain period of time t1 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 outputs a power cutoff signal to the power supply element upon time-up; and the first timer T2. A power saving control device for an electronic copying machine, comprising means for clearing the timing of a second timer T, , T, and instructing a power supply element to supply normal power.