JPS58220149A - Recording device - Google Patents

Abstract

PURPOSE:To prevent the generation of an overlapped picture at the time of the succeeding copying by stopping recording when the defective state of power voltage to be supplied to a recording device is detected by a detecting means and discharging transfer paper left in the recording device at the release of the defective state. CONSTITUTION:A power supply switch SW1 is turned on and new required data are inputted to an RAM in a controller Q1 and displayed on a display DSP. If a default is detected in the AC power voltage by checking an input port PB1, a timer TM is set to a prescribed value, clocking is started and, after completing the clocking, the state of the power voltage is checked again. If the normal state is not restored, said process is repeated, and when a default is detected, an alarm display ALM is turned on and a fixation heater H, a main motor, an exposing lamp L, etc. are turned off. When the power supply is restored to the normal state, the motor M is turned on at first, the transfer paper remaining in a transportation path is discharged and then copying operation is continued. Consequently, copying is prevented from overlap.

Description

[Detailed Description of the Invention] Regarding recording devices such as copying machines and laser beam printers, in particular, it detects abnormal conditions such as a drop in the power supply voltage supplied to the recording device, instantaneous power outage, etc., takes necessary countermeasures, and automatically The system was designed to eliminate obstacles and restore the old state.

In recent years, digital E-C has been used to control this type of recording device, and most of them use microcomputers, etc.
C [If a voltage drop or instantaneous interruption occurs in the power source, the microcomputer etc. will malfunction, causing serious damage to the recording device, or worse, it will not be possible to obtain a satisfactory image on the recording paper used as the RC recording medium, and in the worst case In this case, there was a risk that the recording device would be destroyed. Conventionally, as a means to prevent the occurrence of such failures, a method has been adopted in which a microcomputer or the like is automatically reset to resume control operations from the initial state in response to an abnormal condition such as a drop in power supply voltage or a momentary power outage. Although,
If the microcomputer etc. is reset during the recording operation, the settings such as the number of copies will be different from the original state, and it will be necessary to reset the settings based on the number of finished copies, which will remain in the device. All complicated post-treatment procedures, such as the need to remove the transfer paper, were required. Furthermore, if the microcomputer or the like is reset during the recording operation, all output ports are reset, so the recording operation is stopped. For example, in a copying machine, the operation is stopped while applying a predetermined latent image potential by corona discharge to form a latent image on the photoreceptor, so non-uniformity of the latent image potential remains on the photoreceptor, and the next There have been various drawbacks such as the previous copy image appearing superimposed on the new copy image when copying.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional technology, to immediately respond to the occurrence of abnormal conditions such as a drop in power supply voltage or instantaneous power outage, and to immediately take appropriate countermeasures, so that the same power supply status can be maintained within one unit. It is an object of the present invention to provide a recording device which can automatically discharge the remaining recording paper and restart the recording operation without any trouble.

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

First, the general configuration of a copying apparatus to which the present invention is applied will be explained in the first part.
Figure ζ is shown. In the illustrated copying machine, a drum/liter having a three-layer photoreceptor using an OdS photoconductor on its surface is used.
is rotatably supported by a shaft l and rotated in the direction of arrow /3 in response to a copy command. When the drum l/ rotates to a predetermined position, the original placed on the document table glass plate /g is illuminated by the illumination lamp / integrated with the first scanning mirror /S.
6, and the reflected light is scanned by the first scanning mirror /S and the fifth scanning mirror 7. In addition, the first scanning mirror /S and the fifth scanning mirror 7 run at a speed ratio of /: to keep the optical path length in front of the lens /8 constant at all times. Scan the original.

The reflected light image of the original is formed on the drum 11 at the exposure section 2 through the lens /g, the third mirror /9 and the first mirror θ in sequence. After the drum// is charged, for example, to a seed-like state by a charger JJ, it is exposed to slit light by a reflected light image formed by irradiation with an illumination lamp/B in an exposure section 21, and at the same time, the AC is also j〜〈is the opposite polarity to the − next lightning, for example, with the − polarity, the static eliminator (3) is used to eliminate the static electricity, and then the entire surface is exposed with a full exposure lamp (2) [2, high contrast is formed on the surface] Form a static @ latent image 1, then visualize it as a retoner image.
do.

On the other hand, cassette), A-/fork, < is the transfer paper in roller, 2, 27-/]7 < is: 27-- for paper feed roller bar L or 21-. 1, the first register roller 29-/(, 29-1 takes approximate timing, and the sensor detects a specific passing position of the optical system, responds to the signal obtained by ?9. The photosensitive drum/
/ direction [7] to align the leading edges of the transfer paper and the toner image with each other.

Next, what about the transfer charger? While the transfer paper 27 passes between / and drum //, the toner image on drum ll is transferred onto the transfer paper core. After the transfer is completed, transfer paper 2
7 to the conveyor belt 3.2, and further a pair of fixing rollers, ? ,? -/, 7J-, 2 to fix the toner image by applying pressure and heating, and then discharging it to 3 trays.

Further, after the transfer is completed, the surface of the drum 1/ is cleaned by a cleaning blade 3 which is specially constructed with an elastic blade, and then the next copying operation is started.

In addition, in order to control the above image forming cycle at each operation point, a sensor //
/b generates the citram clock pulse DOK.

Furthermore, as an operation cycle to be performed prior to the above-mentioned image forming cycle, after turning on the power switch MS, the drum l
A pre-rotation cycle is performed in which residual charges and residual latent images on the drum surface are erased using the pre-exposure lamp 223 and the ACC front electric device, and cleaning is performed using the cleaning roller and cleaning blade 3S. This pre-rotation cycle is a preparatory operation to properly maintain the sensitivity of the photosensitive layer on the surface of the drum and to perform film formation on a clean surface. The number of rotations and the time can be changed automatically according to various conditions.

On the other hand, as a post-processing cycle after the copying cycle for the number of sheets set using number key 7.2 is completed, the drum // is rotated several times and the residual charges and residual latent images on the surface are removed using the AC charger 23 or the like. Remove 1. There is a post-rotation cycle to clean the surface of the drum /-/, electrostatically and physically cleaning the drum /-/ in preparation for the next copying operation.

Furthermore, sensor group 3A, ? ? (Upper cassette, 2/, A, Lower cassette) Detects misfeeding, skewed paper feeding, etc. of the transfer paper core fed from ui, and sensor 3g detects paper jam near the transfer section. In addition, a sensor 39 detects a jam in the paper feed near the fixing unit, but each of these sensors detects a jam in the transfer paper,
27, the reflected light from the transfer paper core is detected and a detection output signal is generated.

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. 1 to 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 AC power supply voltage is connected to the AC power source via the main switch SW/ from the power plug P to each AC load AL, 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, H,...
, L include an on/off control element and 1. Solid state relay SSR/ , SSR, 2, SSR, ? , 5
SR4! , . . , 5SRn are connected I2, respectively. Furthermore, D supplies the power supply voltage to the control unit ζ of the copying machine.
A low voltage transformer TI is used in the C stabilized power supply circuit PS/PSco.
2, diode bridges D/, p, 2 and capacitors O/, c2 are supplied with a DC voltage obtained by rectifying the AC power supply voltage [7] to stabilize the solenoid,
DC power supply voltage VB (+
, 24'V) and control circuit power supply voltage vccC+! r
V) is taken out.

In addition, A taken out from the input side of the diode bridge 10
C power supply voltage through power supply monitor PM diode D, ? ,
D4 (by V double-wave rectification, resistor R/, smoothed by capacitor C3, and then connected to comparator Q, 2 via resistor R3.
Supplied to ten terminals. One terminal of the comparators Q and 7 is supplied with the output voltage of the DO stabilized power supply circuit P8.2, which is divided by resistors R3 and R9.
& 1-4 DC stabilized power supply circuit PS, 1. is connected to the diode D, t supplied with the output voltage of
Connect to terminal PB/ of input boat PH. In addition, diode D, ? , D4', capacitor C1? , resistance R/~I
n and comparator 'Qj are AC power supply monitor circuit P.
Configure M. Here, the capacitor field that forms the smoothing circuit [ ] 3
However, due to the smaller capacitance L2 in the normal smoothing circuit,
Sufficiently quick response to abnormal conditions such as a drop in the input AC power supply voltage or a 1m disconnection.1. It is 1- as obtained. Therefore, if the AC power supply voltage) is in a normal state, the AC power supply voltage is rectified and applied to the terminals of the comparators Q and 2, which are based on the reference from the DC stabilized power supply circuit PSλ. It is at a higher potential than the one terminal to which the DC voltage is divided and applied.
The output terminals of comparators Q and 2 are at a high logic level H, but when an abnormal condition such as a drop in the source voltage or a disconnection occurs, the relative potential on the input side of comparator QJ is reversed. The output terminal of is at a low logic level L. In the AC power supply monitor circuit PM, R/-R&
is resistance.

On the other hand, the controller Q) which supplies each of the above-mentioned voltages 1 and constitutes the control unit of the copying apparatus of the present invention can be configured with a well-known one-chip microcomputer, and has a read-only memory ROM in which necessary control programs are stored in advance.
, random access memory RAM that stores various data? , =-, accumulator A, OC, and an input/output port for inputting and outputting various control signals. In addition, each input port PA, PB, PC, PD and each output port PE, PF.

P? , PH, and PI are each composed of l bits (
,,is. However, the input port PA is used to input various keys necessary for copying operations, such as setting the number of copies, selecting a sumo wrestler, operating the copy button, etc. Connect the comparator output of the power supply monitor mentioned above to the terminal PBl of the
Detection output of paper detection sensors 36 and 37, terminal PBJ
The detection output of the paper detection sensor 3S is connected to the terminal PB4, and the detection output of the paper detection sensor tio is connected to the terminal PB4.The paper detection sensors 3A, 37, .3A, and 110 all have the same circuit configuration. 1. As shown in the figure, a reflective sensor using a light emitting diode I, D and a phototransistor PTR can be used.The phototransistor PTR in response to paper detection drives the output transistor OTR [
The low logic level detection output formed by input port PB
The input port PH is normally kept at a high logic level. Incidentally, the other input ports PC and PD are supplied with copy control human power 00I such as other sensor outputs and timing signals necessary for copy control.

On the other hand, the output of the controller Q/PE outputs a timing signal in response to the operation of the key KEY, and at that timing it is sent to the PA. Output capo) PF is output via segment decoder Q3.
7. Copy number HI"aoPYl and set number of copies (S[l
:T ) is connected to the segment display device DSP. The terminal PG/ of the PG is connected to the fixing heater control circuit TH, via the transistor array A/ as an amplifier.
Connect to the output terminal of comparator Qu of 0. This comparator Q4 (one terminal is connected to the fixing heater H,
The temperature detection output voltage of the thermistor TH is supplied to the child terminal (compared with the partial pressure value of the reference DC voltage VB by the resistors R7 and Rf, and when the fixing heater H reaches a predetermined temperature, the voltage of the comparator QII is The comparator output is configured so that the output becomes a low logic 1 novel L.The comparator output is connected to a silicon rectifier 5SR4' which energizes the fixing heater H through transistor array A6.Comparator Q,
When the output of 4( becomes low logic level L, the solid state relay 5SRII turns off, turns off the fixing heater H, and when the fixing heater H falls below a predetermined temperature,
The output of the comparator Ql/ becomes a high logic level, and the solid state relay 83)'i14 is driven to heat the fixing heater H to a predetermined temperature. Note that the output of the comparator Qll is also connected to the input terminal PC/ of the controller Q/. Then, the heating state of the fixing heater H is determined using the controller Q and / so that [7] is obtained. I cut it. As mentioned above, since the output of the comparator Q and the output port terminal PG/ of the controller Q/ are connected through the transistor array AI (-), the output of the comparator Q is
The output of f becomes a high logic level H, and the fixing heater H is turned on.
When the output port terminal PG/ of the middle controller Q and / reaches a high logic level H, heating of the fixing heater H is accelerated to rapidly raise the temperature, and it can be forced to turn off. In the fixing heater control circuit TIC, R4-R9 are resistors.

Next, the output boat terminal PGλ of the controller Q, / is connected to the solid state relay SSR/ for the main motor M via the transistor array A, 2.
J is connected to transistor array A3 tube 1- to silicon rectifier SSR, 2 for exposure lamp L, output port terminal PC, Q
are respectively connected to solid state relay 5SRJ for high voltage transformer T via transistor array AJ. The terminal PH/ of the output port (output port) H is connected to a warning light ALM for power supply voltage drop, instantaneous, disconnection, etc. via the transistor array Aq.
Connect to. In addition, other output port terminals PH-~PII
4< and the output boat PI output copy control outputs CCO such as sheet feeding timing, optical system drive, and other drive output signals necessary for other copy controls. In addition, the above-mentioned drum clock pulse DOK wo controller Q/interrupt i
It is connected to child IN'I' to generate a timing signal for copy control for image formation.

The power supply terminals VA of the controllers Q and /, which function as described above, are supplied with a stabilized rectified power supply voltage from the DC stabilized power supply circuit PS, 2, and an auxiliary power supply voltage from an auxiliary power supply E, such as a battery, in reverse flow to each other. It is commonly supplied through diodes DS and D6 to prevent this. The auxiliary power supply voltage E is set to a voltage value slightly lower than the stabilized rectified power supply voltage Voo, so that there is no power consumption in the auxiliary power supply E when the rectified power supply voltage Voc is normally output. put. The power supply voltage VA supplied to the controller Q/ is the same as the rectified power supply voltage VOO supplied to the power supply monitor circuit PM and the warning indicator ALM described above, and is not affected by an abnormal state such as a drop in the AO power supply voltage or an H disconnection. If this occurs, the auxiliary power supply voltage from the auxiliary power supply E is supplied to the controllers Q, /, as well as their power supply monitor circuit PM and warning indicators A, LM, so that their normal operations can be maintained. It is. Note that the above-mentioned transistor array ~A/-i is connected to a resistor R/-i as shown in Fig. 2A.
It can be composed of IZ~R/A, transistors Tll/i-, and TR.

Next, an example of the voltage waveform when the input A and G power supply voltages in the copying machine electric circuit shown in the first diagram are interrupted and decreased and the output signal waveform of the power supply monitor circuit PM from the comparators Q and 2 are compared to each other. The correspondence is shown in FIG. As shown in the figure, when the A and O power supply voltages are normal, a high logic level H output signal is obtained from the power supply monitor circuit PM, and in an abnormal state such as voltage drop or momentary interruption, a low logic level L output signal is obtained. The output signal is obtained.

Next, a flowchart of the electric circuit shown in the second drawing for driving the copying apparatus shown in the first drawing will be shown in FIG. 3 and FIG. 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 is cleared, and in the next step, key manual operations such as the set number of copies, copy start instruction, sumo wrestler selection, etc. are processed, and the set number of copies is set for the first copy. The display segment display DSP is turned on, operations such as cassette size are displayed, and the process moves to step 3. Step 3
In this case, the power supply is monitored and processed by a subroutine shown separately in FIG. In the power supply monitor subroutine shown in the third figure, first, at step SO,
Check whether the input AClfjL source voltage E is input as a positive voltage or not at the terminal PB/ of input capo-PB. As mentioned above, when the input A and 0 power supply voltages are in the normal state, the power supply monitor output signal supplied to the input port terminal PBl is at the high logic level H, so the answer is YES at step Sθ, and the process shown in Fig. Returns to the main routine and moves to the step step, but if there is an abnormal condition such as a drop in the input AC power supply voltage or a momentary interruption, the input port terminal P]3/ is at the fitted logic level L, so the step moves to the 5 step jθ. The result is No, and the process moves to step /.

In the step S/, the timer TM built in the controller Q, / is activated, for example, by a power cycle! Set to gOmB for θHzOg cycle. This timer setting time is based on the AO power supply, DC stabilized power supply circuit PS/, PS, 2
, it can be set to any desired value depending on the drive type of the copying machine and the like. Then, in step 3.2, the timer starts counting based on the internal clock signal of the controller Q,/, and then, in step j3, the timer TM finishes counting.

If the answer is NO, proceed to step 3 and check the state of the input AC power supply voltage again. S
7 Therefore, even after the timer TM finishes measuring, the human power A
If the C power supply voltage has not returned to the normal state, check the steps again, &,? ,! ; Continue the time measurement of the timer TM through t sequentially [7, Step ♂ 3 # When the time measurement of the iron timer TM is completed, move to step 1, and set the flag F/B indicating a power supply abnormality. and step S
When the output port terminal PH/ is set to turn on the warning indicator ALM at S, the output port terminal PG/ is set to turn off the fixing heater H. Then, the process moves to step St. That step -+
At A, their output port terminals PH/,
Reset all output port terminals except PC/. Therefore, when the copying device is in operation, the main motor, exposure lamp, etc. should be turned off immediately, and the copying device may be damaged due to malfunction due to abnormal conditions such as a drop in the voltage of the input AC power supply or a momentary power outage. Avoid giving.

On the other hand, the steps in the timer timing routine mentioned above! r2
, 'r3 and S7 died and -C
A () If the power returns to normal, step 913
If the answer is YES, the process moves to step sg, resets the timer TM, and then returns to the main routine. That is, if the power supply voltage returns to the normal state during a predetermined period of time after detecting an abnormal state of the input AC power supply voltage, the system operates so as not to determine that an abnormal state has occurred, and Even if the failure occurs within an extremely short period of time, it is determined that an abnormal situation has occurred and normal copying operations are prevented from being interrupted. . Furthermore, as mentioned above,
f! according to the time length of timer TH as described above. Although we tried to prevent misjudgment, we still counted the number of times the power supply abnormality signal occurred.
It is also possible to prevent erroneous judgment when normality returns within a predetermined count value.

When the above power supply monitor subroutine is completed, the process moves from step 3 to step DA, where the flag F/B is checked to determine whether or not there is an abnormal state in the power supply. Detect abnormal condition 1. As a result, if the flag F/B = /, the process moves to step g, and the power supply monitor circuit P
Check whether the power supply returns to normal state according to the detection output of M. If it does not return to normal state, repeat the process of step 1 and step g until the power supply returns to normal state. Repeat. Next, when the power supply returns to normal state, the flag F/B is reset in step 9,
Furthermore, in step 10 and/or the warning indicator ALM
At the same time, reset the output port terminal PH/, which should turn off the output port terminal P, which should turn on the fixing heater H.
G/ is reset, and the process proceeds to step S via step D. 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 it to the input port terminal PC/. It is checked whether the fixing heater H has reached a predetermined fixing temperature in response to a control signal from the fixing heater control circuit Tl(O), and if the fixing temperature has reached the predetermined fixing temperature, the process moves to step 7. Then, it is checked whether the copy command button has been pressed.

The process up to step 7 is a so-called standby cycle, and during this standby cycle, an abnormal condition such as a voltage drop or instantaneous power outage of the input AC power supply as described above occurs.E7
However, as long as the abnormal state of the power supply is resolved, the standby cycle continues after the process until the power is turned on, and no problem occurs.

Next, when the close-up command button is pressed in step 7, the process moves to snap 7.2, and in order to start the copying operation, the output port terminal PC,i is set and the main motor M is turned on. Furthermore, output port terminal PG,? Step 1 after setting the and turning on the high voltage transformer T.
Move to 3. In step/3, the same power supply monitor subroutine as in step 3 is performed again, and then flag F/13 is used to check whether or not there is an abnormal state of the power supply in the step core. If this has occurred, reset all output ports of controllers Q and / in the power supply monitor subroutine to immediately stop the copying operation.
The warning indicator ALM and the fixing heater H are turned off (1), and the process moves to step 2q as shown in the figure. Also, step/
As a result of checking the flag F/E at step 1, if no abnormal state of the power supply has occurred, the process moves to step 3, where pre-copying rotation processing, that is, pre-cleaning processing of the photoconductor, is performed. In step IA, it is checked whether the pre-rotation process has been completed. If the pre-rotation process has been completed, then in step /7 paper feed control process is performed to transport the transfer paper from the cassette, and then in steps /l and /q the power supply monitor The flag F/B 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 proceeds to step 〃, where copy control processing is performed.

A series of image forming processes are carried out to form a recording material by developing, fixing, and transferring a latent image on a photoreceptor to a transfer paper by exposing an original to light. Furthermore, it is also possible to check the power state in steps CO/ and N, or to make the subroutine for checking the power state constantly in the above-described copy processing process. Then step 2
In step 3, it is checked whether the number of copies set by the operator has been completed [7], and if it has been completed, a rotation process is performed after copying in step 26, and then in step 26. Check the power status, and
The step core checks whether the post-rotation process has been completed, and if it has been completed, output port terminals PG2, PG, which turn off the main motor M and the high voltage transformer T, respectively, in step 2g. 7 is reset, and the process returns to step 29, which is in the copy standby routine.

The process described above is a copying cycle, and if an abnormal state of the power supply occurs during this copying cycle, the process moves to step 29 as shown in the figure. However, at that point 1, as mentioned above, as a process within the power supply monitor, the main motor M, high-voltage transformer T, and other copying control signals are turned off in order to immediately stop the copying operation. In step 29, Y is set to flash the warning display ALM and turn off the fixing heater H.
ES, the process moves to step 30, and it is checked whether the power supply has returned to the normal state. If the power supply has returned to the normal state, the flag F/B is reset in step 3/, and the output port terminal PH/ for turning off the warning indicator and ALM is reset. At this point, the fixing heater H is not turned on yet.

Next, in step 3, it is checked whether or not the set number of copies have been completed. In other words, if the power goes out of order during a copying operation and the copying operation is immediately stopped, if the set number of copies have been completed and the transfer paper has been ejected, the transfer paper may remain in the conveyance path. However, if the set number of copies is in the middle of copying, the transfer paper will remain inside the machine, and if the copying machine has a long conveyance path, many sheets of transfer paper will remain in the conveyance path, and the fixing heater H ＃There are cases where it remains stuck.

Therefore, in such a case, unless the fixing heater H is forcibly turned off, there is a risk that the transfer paper will be burnt or damaged by being wrapped around the fixing roller. Next, in step 3, if the set number of copies has been completed 17, step 33 is completed.
, turns on the main motor M and the high voltage transformer T, and then turns on the timer T for a predetermined time in step 3q.
After the timer TM is activated and the timer TM is terminated,
At step 3s, main motor M and high voltage transformer T
Turn off -, return to STEPCO, and proceed to the next copy standby (,,1...1) routine.In addition, step,?,?,3
'l, 3. At step t, the photoconductor is rotated for a predetermined period of time, so that the copying operation is stopped in the middle of the stage where the photoconductor forms a predetermined potential on the photoconductor to form a latent image. When the action of the body stops, the latent image on the photoreceptor becomes non-uniform, which prevents it from becoming a memorized image and having an adverse effect when the next latent image is formed.

That is, in the copying apparatus of the present invention, when an abnormal state of the power supply occurs during the copying operation and the copying apparatus stops @# production, when the power supply returns to the normal state, the predetermined operation is automatically performed. Non-uniform charging of the photoreceptor is prevented by periodically rotating the photoreceptor for cleaning. If the value is 1.10 in step 3λ, the process moves to step 3B shown in FIG. If the copying operation is stopped in the middle of the copying operation, the transfer paper remains in the conveyance path, so the main motor M is turned on to drive the conveyance mechanism and discharge the transfer paper out of the conveyance path. 1. Continue this residual transfer paper ejection operation in steps 37, 31, and 39 until the paper sensor installed on the conveyance path confirms that all the residual transfer paper has been ejected, and when the ejection is completed, step Output port terminal PG for turning on the fixing heater H starting at qO
/ Set. That is, as described above, by turning on the fixing heater H after all the residual transfer paper in the copying device is discharged, the fixing heater roller and the residual transfer paper itself are prevented from being burned into lumps due to the residual transfer paper. Next, in step f/, the high voltage transformer T is turned on to perform cleaning rotation of the photoreceptor, and it is checked 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 J7 and the remaining copying operations are continued. Then, the copying operation is restarted.

As is clear from the above description, according to 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 voltage drop or momentary power outage of the power supply is detected while the recording operation is stopped, the recording operation will be immediately interrupted and the recording device will be prevented from malfunctioning due to the power supply voltage drop or momentary interruption. prevent the occurrence of
When the power returns to the normal state, the remaining recording operations are automatically restarted, and when the recording operation is restarted, processing such as cleaning rotation of the photoreceptor is automatically performed, and the remaining parts are automatically removed from the conveyance path when the recording operation is interrupted. To ensure safety, the remaining recording paper is automatically ejected and the fixing heater is turned on after it is ejected, and the power supply voltage is monitored for drops and momentary interruptions (in this case, it is necessary to monitor the drive control of the recording device). Responds to detection of voltage drops and instantaneous interruptions in the culm that do not cause problems, and prevents them from occurring.
7. Even when a power supply abnormality occurs, recording operations can always be performed in the most optimal state.

[Brief explanation of the drawing]

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. // drum, /2...axis, /3 arrow,
/q...Original table glass plate, is,
/7 Scanning mirror, /6...Illumination lamp, 7g...
・Lens /9, 20...Mirror, 21
...Exposure section, here...charger, 3 static eliminator, 24t...exposure rung, ko S...
・Developer, , 26 cassette, core...
Transfer paper, bar...paper feed roller, 29.3θ・
...Register roller, 3/...Transfer static eliminator, 32...Transport belt, 3
3...Fusing roller, ? II Tray, 3k
・・・Cleaning blade, 3A~39・Sensor, +9・Switch. 7.2...Several keys, , 2 here...Front static eliminator 1.2 Sword...Front exposure lamp MS...Power switch, P...Power plug, S
W/... Main switch, AL-AC load, M...
・Main motor, L...Exposure lamp, T...High voltage trasis, H. Fixing heater, SSR solid state relay, PS/ , PS, 2...Stabilizer, #circuit, TI
・Low voltage transformer, D/～[)B...Diode. C/~C3 content, R/~R3/resistance, PA-PE
・Input port, PF-, PI Output port, TH...
・→No Mister Q/Con] Laura. Q, 2+ Q, t/ Comparator, Q3/Decoder, A/~AA...Transistor array, Ace...Aggregator, ROM/Read-only memory, RAM/Rank access memory, ALM...Warning indicator , PM-16, source monitor, LED - light emitting diode, PTR...phototransistor, OTR...output transistor, KEY...key, DSP segment display, THO...fixing heater control circuit, E... Auxiliary power supply, TM timer.

Claims (1)

[Claims] In a recording apparatus that performs image formation and records, the recording device fI1. a detection means for detecting an abnormal state of the power supply voltage supplied to the power supply; a stop means for stopping the recording operation of the recording device in response to the detection of the abnormal state of the power supply voltage by the detection means; What is claimed is: 1. A recording apparatus comprising: auxiliary power supply means for maintaining operation; and when the abnormal state of the power supply voltage is resolved, transfer paper remaining in the recording apparatus is automatically discharged.