JPS58220166A - Recording apparatus - Google Patents

Abstract

PURPOSE:To deal with trouble properly and to restart recording after the restoration without trouble, by always watching change of power supply, and executing necessary controls at the time of trouble occurrence and its restoration using a monitor capable of being fed with auxiliary power from power supply. CONSTITUTION:When an AC power supply voltage from a transformer T1 lowers to a preset value or less, output of the comparator Q2 of a power supply monitor PM is inverted to a lower level, and when this state continues after the end of the timer period of the timer TM of a controller Q1, it is judged that it is caused by the abnormal voltage of the power supply. Power is normally supplied from the power supply to these monitor PM and the controller Q1 through diodes D5, D6, and when the power supply is abnormal, power is fed from an auxiliary power supply somewhat lower in voltage and nonsupplied at normal times, and watching of fluctuation of the power supply is continued during the time of the abnormal state. At the time of judgment of trouble, recording action is stopped, and proper countermeasure is taken, and at the time of restoration to the normal state, power supply is started to a fixing heater after the transfer paper has been removed and recording is restarted without trouble.

Description

[Detailed Description of the Invention] Regarding a recording device such as a copying machine or a laser beam printer, in particular, the present invention detects an abnormal state such as a drop in the power supply voltage supplied to the recording device or a momentary power cut, and takes necessary countermeasures. This is so that the copying operation can be restarted without any trouble.

Recently, digital ICs have been used to control this type of recording device, and most of them have been commercialized using microcomputers.
A voltage drop or instantaneous power outage occurs in the power source 1B, the microcomputer, etc. malfunctions, causing serious damage to the recording device, or it may not be possible to obtain a satisfactory image on the recording paper used as the recording medium. In the worst case, there was a risk that the recording device would be destroyed. Conventionally, as a means to prevent the occurrence of such failures, there has been a means for automatically resetting a microcomputer or the like to resume control operations from the initial state in response to an abnormal state such as a drop in power supply voltage or a momentary power outage. However, if the microcomputer etc. is reset during the recording operation, the settings such as the number of copies will be different from the initial state, and it will be necessary to reset the settings based on the number of finished copies, which will cause the device to Complicated post-processing was required, such as the need to remove the transfer paper remaining inside. That is, if the microcomputer or the like is reset during the recording operation, all the output ports are reset, so the red-recording operation is stopped. For example, in a copying machine, recording paper that is being recorded remains inside the machine. Therefore, if the recording operation stops while the recording paper is passing through the constant-N heater roller,
Remains the same when the power status is restored =! When you resume recording,
There were various drawbacks, such as the recording paper wrapped around the heater roller being burnt out and, in the worst case scenario, a fire.

It is an object of the present invention to eliminate the above-mentioned conventional drawbacks, to immediately respond to the occurrence of an abnormal state of power supply voltage, to take appropriate countermeasures, and when the power state is restored, after ejecting the recording paper remaining in the apparatus, It is an object of the present invention to provide a recording device that can restart recording operations without any trouble.

The present invention will be described in detail below with reference to the drawings.

ゝ＼ ゝ、 ＼＼ ＼＼ ＼5 First, the general configuration of a copying apparatus to which the present invention is applied is described in the first section.
As shown in the figure. In the illustrated copying machine, a drum//
is rotatably supported by a shaft and rotated in the direction of arrow /3 in response to a copy command. When the drum l/ rotates to a predetermined position, the illumination lamp/ which is integrated with the first scanning mirror 15 illuminates the original placed on the original glass plate/U.
The reflected light is scanned by the first scanning mirror tS and the second scanning mirror /7. The first scanning mirror /S and the second scanning mirror /7 scan the original at a speed ratio of l knee, so that the optical path length in front of the lens /g is always kept constant. scan.

The reflected light image of the original is transmitted to the drum 11 at the exposure unit 2/ through the lens /g, the third mirror /9, and the p-th mirror in sequence.
image on top. The drum // is charged to, for example, ten polarities by a -order charger 2.2, and then irradiated with an illumination lamp /6 in an exposure section / to form a slit exposure using a reflected light image. , AC is also L〈 - After the static electricity is removed by the static eliminator 3 with the opposite polarity to the - polarity, for example - polarity, the entire surface is exposed [2
, forming a high contrast electrostatic latent image on its surface, which is then visualized into a toner image by a developer.

On the other hand, for sumo wrestlers), 2A-/ or transfer paper in Muco (-), feed 27-.2 into the machine by paper feed roller g-7 or 2g-2, and then A sensor 39 detects a specific passing position of the optical system by taking approximate timing using roller 9-/or 9-.2.
The second register roller 30, which responds to the signal obtained by the transfer paper, sends the toner image toward the photosensitive drum with accurate timing, so that the leading edges of the transfer paper and the toner image coincide with each other.

Next, the transfer paper 2 is inserted between the transfer charger 3/ and the drum//.
7 transfers the toner image on drum 11 onto the transfer paper core. After the transfer is completed, the transfer paper 27 is guided to the conveyor belt 3.2, and then the fixing roller pair 33
-/, 3.3-. After the toner image is fixed by pressure and heating, the tray 34/l is discharged.

After the transfer is completed, the surface of the drum l/ is cleaned by a cleaning blade 33 made of an elastic blade, and then the next copying operation is started.

In addition, in order to control the above-described image forming cycle at each operation point, a drum clock is mounted by a sensor //b that optically detects one clock point of the clock dial //a that rotates with the rotation of the drum //. In addition, as an operation cycle to be performed prior to the above-mentioned image forming cycle, the drum l/
, rotate the pre-exposure lamp λ23 and the AC pre-static eliminator 2.
22 or the like to erase residual charges and residual latent images on the drum l/surface, and perform a pre-rotation cycle for cleaning by the cleaning roller and cleaning blade 3S.

This pre-rotation cycle is a preparatory operation that maintains the sensitivity of the photosensitive layer on the surface of the drum 71 appropriately and enables image formation on a clean surface.
The pre-rotation speed and time of l can be automatically changed according to various conditions.

On the other hand, as a post-processing cycle after the copying cycle for the number of sheets set by the number key 72 is completed, the drum // is rotated several times to remove any residual charge or residual latent image on its surface using an AC charging device, etc. After removing and cleaning the surface of the drum 17, there is a rotational leakage and the drum // is electrostatically
Physically clean and prepare for the next copying operation.

Furthermore, the Senza group? The upper cassette: tAA, the lower cassette) A, 77 detects transfer paper fed from 2AB, paper feeding errors, skewed paper feeding, etc., and the sensor 3g detects paper jams near the transfer section. The sensor 3q also detects a jam in the paper feed near the fixing unit, and each of these sensors detects the reflected light from the transfer paper 27 that is received when passing through the transfer paper core and outputs a detection output. It forms a signal.

Next, the mode of operation of a copying apparatus according to an embodiment of the present invention when a power supply voltage abnormality occurs will be described with reference to FIGS. 2 and 3.

First, an example of the schematic configuration of the main parts related to the present invention among the electric circuits that control the copying apparatus configured as shown in the first figure will be explained as follows.
As shown in the figure. In the illustrated circuit configuration, the power supply voltage A(E vt, as shown in the figure, is
L, main motor M, exposure lamp L, high voltage transformer T,
It is supplied to the fixing heater H, etc., and each load M, L, T, I
(..., L is an on/off control element 7, solid state relay SSR/, SSR, 5SRJ
, 5SR1/, -, 5SRn are connected respectively. Furthermore, D supplies the power supply voltage to the control section of the copying machine.
o Stabilized power supply circuit PS/.

PS, 2 is connected to a diode bridge [)/, [)j and a capacitor a/, Cry, via a low voltage transformer T/.
By rectifying the AO power supply voltage and supplying DC voltage, it is stabilized and the D of the solenoid, clutch, etc.
DC power supply voltage vB for C load, (+2</V)
and control circuit power supply voltage V,co (+5 V).

Also, A taken out from the input side of the diode bridge D
OTt, power source voltage monitor PM diode DJ,
The V wave is rectified by D4', smoothed by resistor R/, and capacitor GJ, and then supplied to the child terminal of comparator Qj via resistor R3. One terminal of the comparator Q,2 is connected to a resistor R,? , DC divided by RII
Supplies the output voltage of the stabilized power supply circuit PS. The output terminal is connected to a diode supplied with the output voltage of the DC stabilized power supply circuit PSu via a resistor R&, and is also connected to a terminal PB/ of the input capacitor (PB). In addition, diodes DJ, DI, capacitor C3, resistor R/~R,
t and comparator Q are AO power supply monitor circuit PM
Configure. Here, the capacitor C3 forming the smoothing circuit is designed to have a smaller capacitance than that of a normal smoothing circuit, so that it can respond sufficiently quickly to changes in abnormal conditions such as a drop in the input AC power supply voltage or a momentary interruption. It is. (7 Therefore,
If the AC power supply voltage is in a normal state, the child terminal of comparator Q, 2 to which the AO power supply voltage is rectified and applied,
It is at a higher potential than one terminal to which the reference DC voltage from the DC stabilized power supply circuit S2 is divided and applied, and the comparator Q,
When a high logic level H is generated at the output terminal of No. 2, the relative potential at the input side of the comparator QJ is reversed, so that the output terminal of the comparator QJ becomes a low logic level L. In the AC power supply monitor circuit PMj, R/ to R3 are resistors.

On the other hand, the controller Q/, which supplies the above-mentioned voltages and constitutes the control section of the copying apparatus of the present invention, can be constructed with a well-known one-chip microcomputer, and has a read-only memory ROM which stores necessary control programs in advance.
, a random access memory RAM for storing various data, an accumulator AOC, and an output port for inputting and outputting various control signals. In addition, each input boat PA, PB, PC, PD and each output boat PI', PF.

PG, PH, and PI are each composed of davits. The PA is used to input various key inputs necessary for copying operations, such as setting the number of copies, selecting a cassette, and operating the copy button.
Connect the comparator output of the power supply monitor mentioned above to the terminal PB/ of PB, and output the terminal PB, ? The detection output of the paper detection sensor 3S is connected to the terminal pB<z, and the detection output of the paper detection sensor tio is connected to the terminal pB<z. Each paper detection sensor 3J-,,31,,? ? , and O have the same circuit configuration 7, and as shown in the figure, the light emitting diodes A and 1. A reflective sensor using an FD and phototransistors PT and R can be used. Respond to paper detection 1. The low logic level detection output formed by the phototransistor PTR driving the output transistor OTR is supplied to the input port PB, and the terminal of the input port PB is normally set at a high logic level (note that other input ports) Copy control human power 00I such as other sensor outputs and timing signals necessary for copy control is supplied to the PC and -PD.

Then, at that timing, the KEY input is sent to the manual boat PA. The output port PF receives the number of copies (C0PY) and the number of set sheets (SE) through the segment decoder Q3.
Connect to the segment display DSP that displays T). The terminal PG/ of the PG is connected to the fixing heater control circuit THO via the transistor array AI as an amplifier.
Connect to the output terminal of comparator Q+. One terminal of this comparator QtI is supplied with the temperature detection output voltage of the thermistor TH coupled to the fixing heater H.1. ．． 2, compare the voltage divided by the resistor R7 and R of the reference DC voltage VB supplied to the child terminal [7], and when the fixing heater H reaches a predetermined temperature, the outputs of comparators Q and 4Z become low logic level L. The comparator output of 1''C, configured so that When relay 5SRII is turned off and fixing heater H is turned off, and when fixing heater H falls below a predetermined temperature, the output of comparator Q41 becomes a high logic level, driving solid state relay 5SRII, and setting fixing heater H to a predetermined temperature. Heat the comparator Q to
+ output is input port PC terminal P of controller Q/
It is also connected to C/2 so that the heating state of the fixing heater H can be determined and obtained by the controller Q/. Also, as mentioned above, the output port terminal PG/ of the controller 9 Q/ is connected to the output of the comparator QJ via the transistor array A/, so the output of the comparator QJ is connected to the output port terminal PG/ of the controller 9 Q/ via the transistor array A/.
When the output port terminal pG/ of the controller Q/ reaches a high logic level H while the output of the controller Q/ reaches a high logic level H and the fuser heater H is heating, the heating of the fuser heater H is accelerated to rapidly raise the temperature and the temperature is forced to rise. It can be turned off automatically. In the fixing heater control circuit T) (O, RA-R9 is a resistor.

Next, the output port terminal PC,2 of the controller Q,/
is connected to the solid state relay SSR/ for main motor M via transistor arrays A and 2, and output port terminal P.
G3 is connected to the silicon rectifier SSR,2 for the exposure lamp L via the transistor array A3, and is connected to the output capo/upper terminal PG4.
(is the high voltage transformer T via the transistor array A4!
Solid Stereo Relay-8SR,? Connect to each. The output capo)H terminal PHt is.

The power supply voltage decreases through transistor array AJ.

Connect to the ALM warning light for instantaneous power outages, etc. Further, from other output port terminals PH, 2 to PH+ and output port PT, copy control outputs CCO such as paper feed timing, optical system drive, and other drive output signals necessary for other copy controls are output. In addition, the above 12. drum clock pulse D (3
K is connected to the interrupt terminal INT of the controller Q/ to generate a timing signal for copy control for image formation.

The power supply terminal v of the controller Q/ which functions as described above.
A is commonly supplied with a stabilized rectified power supply voltage from a DC stabilized power supply circuit PS, 2, and an auxiliary power supply voltage from an auxiliary power supply E, such as a battery, through diodes DS and DA to prevent mutual reverse flow. do. In addition, the auxiliary power supply voltage E
is set to a voltage value slightly lower than the stabilized rectified power supply voltage VOO, and the rectified power supply voltage V. When C is normally output, the auxiliary power source E is configured so that it does not consume power. The power supply voltage V^ supplied to the controller Q/ is the same as the rectified power supply voltage VfIC supplied to the power supply monitor circuit PM and the warning indicator ALM described above, and is protected against abnormalities such as a drop in the AC power supply voltage or momentary interruption. If a condition occurs, the auxiliary power supply E is applied to the controllers Q and / as well as their power supply monitor circuit PM and warning indicator ALM.
[7] is configured such that the auxiliary power supply voltage is supplied from the auxiliary power source to maintain normal operation of each. Note that the above-mentioned transistor array A/~AA includes resistors R/RI~R/A and transistors TR/ and TRJ, as shown in FIG. 2A.
It can be composed of

Next, an example of the voltage waveform at the time of instantaneous interruption and drop of the input AC power supply voltage in the copying machine electric circuit shown in the second diagram described above is made to correspond to the output signal waveform of the power supply monitor circuit PM from the comparator Q2. Shown in Figure 3. As shown in the figure, when the AC power supply voltage is normal, a high logic level H output signal is obtained from the power supply monitor circuit PM.
In an abnormal state such as a voltage drop or a momentary interruption, an output signal of a low logic level L is obtained.

Next, a flowchart of the electric circuit shown in the first drawing for driving the copying apparatus shown in the first drawing is shown separately in FIG. 9 and FIG. 3. In the illustrated flowchart, the power switch S
When the W/ is turned on and the power is turned on, the random access memory RAM for data memory is cleared, and in the next step, key manual input such as the set number of copies, copy start instruction, cassette selection, etc. are processed, and the segment display for displaying the set number of copies is displayed. The DSP is turned on, operations such as cassette size, etc. are displayed, and the process moves to step 3. In step 3, power supply monitoring and processing are carried out in a subroutine separately shown in FIG. In the power supply monitoring subroutine shown in FIG. 3, immediately at step Sθ, it is checked whether or not the input AC power supply voltage E is being input normally to the terminal P]3/ of the input port PB. As mentioned above, when the input AC power supply voltage is in a normal state, the power supply monitor output signal supplied to the input port terminal PB/ is at a high logic level H, so if you select YES at step Sθ, you can immediately start the Returns to the main routine shown in the figure and moves to step da, but if the input AC power supply voltage is in an abnormal state such as a drop or a momentary interruption, the input port terminal P
Since B/ is at the low logic level L, step SO
The answer is NO, and the process moves to step Sl. In step si, a timer (r)4 built in the controller Q,/ is set to, for example, q cycles gθm8 of the power supply cycle SθHz. This dimer setting time is A
C\It source, DC stabilized power supply circuit PS/, PSco,
It can be set to any desired value depending on the drive type of the copying machine and the like. Next, in step S3, the timer starts counting time based on the internal clock signal of the controller Q, /, and then in step S3, it is checked whether or not the timer TM has finished counting. The process then moves to step S7 and the state of the input AC power supply voltage is checked again. Therefore, even after the timer TM finishes counting, the input AC power supply voltage will return to the normal state (if it has not returned to normal, step !co, ,lt,? , ,
The timer TH continues to measure time through lt7 sequentially, and when the timer TM finishes measuring time in step S3, the process moves to step klI, where a flag F/B indicating a power supply abnormality is set, and step SS , the warning indicator AL
After setting the output port terminal PH/ to turn on the fuser M and setting the output port terminal PG/ to turn off the fixing heater H, the process moves to step j6. In the step audience, all output port terminals other than those output port terminals PH/ and PG/ are reset. Therefore, during the copying operation of the device,
Immediately turn off the main motor, exposure lamp, etc.
To prevent damage to a copying device due to malfunction in an abnormal state such as a voltage drop or instantaneous interruption of an input AC power source.

On the other hand, the steps in the timer timing routine mentioned above! , 2.
! If the AO power supply returns to normal state during the predetermined timing in steps 3 and S, select YES in step j7.
Then, the process moves to step sg, resets the timer TM, and then returns to the main routine. In other words, if the power supply voltage returns to a normal state during a predetermined period of time after detecting an abnormal state of the input AC power supply voltage, the operation is performed so as not to determine that an abnormal state has occurred, and the power supply voltage is Even if the blackout ends within a very short period of time and no trouble actually occurs, it is determined that an abnormal situation has occurred and the normal copying operation is prevented from being interrupted. In addition, in the above description, the above-mentioned erroneous judgments were prevented by using the time length of the timer TM, but it is also possible to prevent erroneous judgments by counting the number of times the power supply abnormality signal occurs and returning to normal within a predetermined count value. You can also do this.

When the above power supply monitor subroutine is completed, the process moves from step 3 to step t, and the flag F/B is checked (
7, it is determined whether or not there is an abnormal state in the power supply, and if the abnormal state in the power supply is detected by the power supply monitor circuit PM in step 3, and as a result, the flag F/B = /. Move to step ZA and power supply monitor circuit P
Check whether the power supply has returned to normal state according to the detection output of M [7. If it has not returned to normal state,
Repeat the step and step process until the power supply returns to normal state. Next, when the power returns to the normal state, the stepper resets the flag F/B, and furthermore, in steps IO and //, the output port terminal PH/, which should turn off the warning indicator ALM, is reset, Output port terminal PG where fixing heater H should be turned on
/ is reset (7), and the process proceeds to step S via step ke. In step S, it is checked whether or not it is in the stop mode, for example, whether there is paper in the cassette, whether there is a jam, etc., and if it is not in the stop mode, it moves to step B and supplies the signal to the input port terminal PQ/. It is checked whether the fixing heater H has reached a predetermined fixing temperature in accordance with the control signal from the fixing heater control circuit THO, and if the fixing temperature has reached the predetermined fixing temperature, the process moves to step 7. Check whether the copy command button has been pressed.

The process up to step 7 is the so-called standby cycle, and even if an abnormal condition such as a voltage drop or instantaneous power outage occurs in the input AC power supply as described above during this standby cycle, even if the abnormal condition of the power supply is resolved, If this is done, the standby cycle will continue following the previous steps and no problems will occur.

Next, when the copy command button is pressed in step 7, the step saw is activated, and in order to start the copying operation, the output port terminal PG4 is set and the main motor M
Step 13 at the shop where the output port terminal PC' and 3 are set to turn on the high voltage transformer T.
to move to. In step /3, the same power supply monitor subroutine as in step 3 is performed again, and then, in step /lI, flag F/B is used to check whether or not there is an abnormal state of the power supply. If an abnormal state occurs, all output ports of the controller Q/ are reset in the power supply monitor subroutine to immediately stop the copying operation.
The warning indicator ALM and the fixing heater H are turned off (2), and the process moves to step 9 as shown. Also, as a result of checking the flag F/B at step/g, if no abnormal state of the power supply has occurred, the process moves to step/k to perform pre-copy rotation processing, that is, pre-cleaning processing of the photoreceptor. Then, in step B, it is checked whether the pre-rotation process has been completed. If the pre-rotation process has been completed, a paper feed control process is performed to transport the transfer paper from the cassette in step /7, and then, in steps /g and /9, the power supply monitor Flag F/13 is used to check whether or not a power supply abnormality has been detected, and if no power supply abnormality has been detected, the process moves to step 〃, where copying control processing is performed, that is, the development and fixing of the latent image on the photoreceptor by exposing the original. , performs a series of image forming processes in which the image is transferred to a transfer paper and a recording material is formed. Furthermore, it is also possible to check the power state in steps CO/ and N, or to constantly perform a subroutine for checking the power state in the above-described copy processing process. Next, in step 23, it is checked whether or not copying of the number of copies set by the operator has been completed, and if it has been completed, a post-copying rotation process is performed in step J', and then in step J and the roller. The power supply status is checked at step JJ, and the step core is checked to see if the post-rotation process has been completed. If it has been completed, the main motor M and high voltage transformer T are each turned off at step JJ. output port terminal p
G2. The PGJ is reset and shifted to step λ in the copy standby routine again via step 29.

The processing process described above is a copying cycle, but if an abnormal state of %6f occurs during this copying cycle, the process moves to the step bar as shown in the figure. As shown in step 1 of the power supply monitor subroutine, in order to immediately stop the copying operation, the main motor M, high voltage transformer T, and other control signals are turned off and the warning indicator ALM is turned on. let me,
Since the fixing heater H is turned off at L7, the answer is YES in step 29, and the process moves to step 3θ. Check to see if the power has returned to normal. j,
If the power has returned to normal, proceed to step 3/
The flag F/B is reset at , and the output port terminal PH/ for turning off the warning indicator ALM is reset. At this point, the fixing heater H is not turned on yet. Next, in step 32, it is checked whether or not the set number of copies has been completed. In other words, if the power supply goes into an abnormal state during the copying operation and the copying operation is immediately stopped, the set number of copies will not be completed. If the transfer paper is ejected when all is completed l~, there is no transfer paper remaining in the conveyance path, but if the set number of copies is in the middle of copying, the transfer paper remains inside the machine and the conveyance path is If the copying machine is long, many sheets of transfer paper will remain in the conveyance path, and furthermore, there may be cases where the sheets of transfer paper remain in the fusing heater H.

Therefore, in such a case, unless the fixing heater H is forcibly turned off, there is a risk that the transfer paper may be burnt or may wind up on the fixing roller and be damaged. Next, step? ,
21, if the set number of copies has been completed, the process moves to step 33, where the main motor M and high voltage transformer T are turned on, and then, in step 3q, the timer TM is activated for a predetermined period of time. After the operation of the timer TM is completed, the main motor M and the high voltage transformer T are turned off in step 3S, and the process returns to the step controller to proceed to the next copying standby routine. In addition, step 33,
．． In 71I, ,B;, by continuing the cleaning rotation of the photoreceptor for a predetermined period of time, the copying operation is stopped in the middle of the stage where the photoreceptor forms a predetermined potential on the photoreceptor to form a latent image. When the action of the photoreceptor is stopped, the image on the photoreceptor becomes non-uniform and becomes a memorized image when the next latent image is formed, thereby preventing an adverse effect.

In other words, in the copying apparatus of the present invention, when an abnormal state of the power supply occurs during the copying operation and the operation of the copying apparatus is stopped, when the power supply returns to the normal state, the automatic The photoreceptor is rotated for a predetermined period of time to prevent uneven charging of the photoreceptor. Further, if the answer is No in step 32, the step shown in the figure, ? Move to step B [15. Set the output port terminal PC, 2 to turn on the main motor A. In other words, as mentioned above, if the copying operation is stopped in the middle of the copying operation, the transfer paper will remain in the conveyance path, so the main motor M is turned on to drive the conveyance mechanism and the transfer paper is transferred. This residual transfer paper discharge operation is continued until it is confirmed in step ??, Jlr, 39 that all the residual transfer paper is discharged by the paper sensor provided on the conveyance path, and then the discharge is carried out. When this is completed, the output port terminal PG/ is set to turn on the fixing heater H starting at step tio.In other words, as described above, the fixing heater H is turned on after all the remaining transfer paper in the copying device is ejected. By doing so, the fixing heater roller and the residual transfer paper itself are prevented from being burnt out due to the residual transfer paper.Next, in step q/, the high voltage transformer T is turned on to perform cleaning rotation of the photoreceptor.
Check whether the fixing device has reached a predetermined fixing temperature.

Note that until the fixing device reaches the predetermined fixing temperature, the cleaning rotation is continued as described above, and when the fixing device reaches the predetermined fixing temperature, the process moves to step 37 and the remaining copying operations are continued. Then, the copying operation is restarted.

As is clear from the above description, according to one aspect of the present invention, the state of the AC power supplied to the recording apparatus is constantly monitored, and the drive power for the monitor control section is always secured by the auxiliary power supply, and the If an abnormal condition such as a drop in power supply voltage or a momentary power outage is detected while the recording operation is stopped, the entire H'EL recording operation will be activated immediately during the recording operation. This prevents the occurrence of a failure in the recording device, automatically restarts the remaining recording operations when the power returns to a normal state, and automatically performs processing such as cleaning rotation of the photoreceptor when the recording operation is resumed. To ensure safety, the recording paper remaining in the conveyance path is automatically ejected when the recording operation is interrupted, and the fixing heater is turned on after being ejected. 1. When monitoring power supply/voltage drops, momentary interruptions, etc. , voltage drop to the extent that it does not interfere with the drive control of the recording device, and not responding to the detection of R disconnection, so that the recording operation is always performed in the best possible state in the event of a power supply abnormality. You can make it work.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an example of a schematic configuration of a copying apparatus to which the present invention is applied; FIG. 1 is a waveform diagram of the copying apparatus;
FIG. 1 and FIG. l/...Drum, /+2...Axis, /3
...Arrow, /lI...Original table glass plate, /& , /7...Scanning mirror, /6...Illumination lamp, /l...Lens /9,20...
・Mirror, Co/...Exposure section, 2.2 Charger 1.23...Static eliminator, 2y...Exposure lamp, J...Developer, 26...Cassette, core Transfer paper, , 2f ...Paper feed roller,
9, 30・Register roller, 3/・・・Transfer static eliminator, 3・・Transport belt, 3
3...Fusing roller, 34t...Tray. 3S...Cleaning blade, 3A~39...Sensor% Back...Switch, Octopus...Several keys, -1 piece...Front static eliminator. , 2/3...Pre-exposure lamp, MS...Power switch, P...Power plug, S
W/...main switch, AL...AC negative i,
M...Main motor, L...Exposure lamp, T...
・High voltage transformer, H...Fusing heater, SSR・
...Solid state relay, PS/ , PS,!・
・・Stabilized power supply circuit, T/・Low voltage transformer, D/−
DA...Diode °, C/~C3...Capacitor,
R/-R, lt...Resistance, PA -PE...Input port, P'F-PI...Output port, -TH...Thermistor, Q/...Controller, q:1r Q
, tt...Comparator, Q3...Decoder, A/
~A6...Transistor array, AOO/accumulator, ROM...Read only memory, RAM/Random access memory, ALM...Warning indicator, PM...Denryu monitor,
LED...Light emitting diode, PTR...Phototransistor.

Claims (1)

[Claims] In a recording apparatus that performs image formation and records, there is provided a detection means for detecting an abnormal state of a power supply voltage supplied to the recording apparatus, and a recording operation of the recording apparatus in response to detection of an abnormal state of the power supply voltage by the detection means. A stop means for stopping the stop means and an auxiliary power supply means for maintaining the operation of the stop means and the detection means; A recording device characterized in that power supply to a heater is started.