JPS58220168A - Recording apparatus - Google Patents

Abstract

PURPOSE:To execute recording kept always in the optimum state, by stopping recording when power supply voltage is abnormal, feeding power from an auxiliary power supply to continue monitoring of fluctuation of the power supply, and destaticizing a photoreceptor, too, at the time of restoration from the abnormal state. 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 the abnormal voltage of the power supply is detected, and recording action is stopped by the controller Q1. At the time of abnormal voltage of the power supply, feed of power to the monitor PM and the controller Q1 is automatically changed over to the auxiliary power supply E passing through a diode D6 to continue watching of fluctuation of the power supply. When abnormal voltage of the power supply is restored to the normal state, feed of power to a heater H after ejection of the transfer paper as well as destaticization of a photoreceptor, too, are executed for a prescribed time length with a controller Q1 in response to the monitor PM, and an instabilized latent image and the like are erased, thus permitting recording always kept in the optimum state.

Description

[Detailed Description of the Invention] Regarding recording devices such as copying machines and laser beam printers, in particular, it is possible to detect an abnormal state such as a drop in the power supply voltage supplied to the recording device or a momentary power outage, and automatically take necessary countermeasures R. It was designed so that it could be carried out.

Recently, digital ICs have been used to control this type of recording device, and most of them have been commercialized using microcomputers.
If a voltage drop or instantaneous power outage occurs in the C power supply, the microcomputer etc. will malfunction, causing serious damage to the recording device. It has a habit of causing destruction of recording equipment.

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. However, if the microcomputer etc. is reset during recording, the settings such as the number of sheets to be recorded will be different from the initial state, and it will be necessary to reset the settings based on the number of sheets to be recorded. A complicated post-treatment process was required to remove the transfer paper remaining inside the cap. 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 a predetermined latent image potential is being applied by corona discharge to form a latent image on the photoreceptor, so that non-uniformity of the latent image potential remains on the photoreceptor. There are various drawbacks such as the previous copy image appearing superimposed on the new copy image when the next copy is made.

It is an object of the present invention to eliminate the above-mentioned drawbacks of the conventional technology, to immediately respond to the occurrence of an abnormal state such as a drop in power supply voltage or a momentary power outage, to take appropriate countermeasures, and to enable the recording operation to be resumed after the power supply is restored. An object of the present invention is to provide a recording device that does not cause trouble.
As shown in the figure. In the illustrated copying apparatus, a drum l/ having a three-layered photoreceptor using a CdS photoconductor on its surface is rotatably supported by a shaft/, 2, and is rotated in the direction of arrow /3 in response to a copying command. Rotate it. That drum // is in the specified position @
, the document placed on the document table glass plate/4' is illuminated by the illumination lamp/6 integrated with the seventh scanning mirror/(), and the reflected light is transmitted to the first scanning mirror/(1).
scanning by the body and the first scanning mirror/S. Note that the first scanning mirror /S and the first scanning mirror /S are moved at a speed ratio of l:/, so that the optical path length in front of the lens /g is always kept constant. Scan the original.

The reflected light image of the original is transmitted to the drum at the exposure section through the lens/S, the third mirror, and the t mirror in sequence.
image on top. The drum l/ is charged to, for example, ten polarity by the -order charger ko 2, and then exposed to slit light by a reflected light image formed by irradiating the drum with an illumination lamp/l in the exposure section ko 1. (〈〈〈 is the negative polarity of the lightning, for example, after removing the static electricity with the static eliminator 3 with the negative polarity,
Further, the entire surface is exposed using the entire surface exposure lamp 2'l, and a high-contrast electrostatic latent image is formed on the surface, and then,
Visualize it into a toner image using a developer.

On the other hand, cassette 21. -/ or 26--, the transfer paper 27-/ is also I~<, the core 2 is fed into the machine by the paper feed roller ko-l or 2g-5, and the first register roller 9-/or 9 Approximate timing is determined by - and accurate timing is determined by first register roller 9, which responds to the signal obtained by sensor J9 that detects the specific passing position of the optical system, and the photosensitive drum is sent in the // direction. Then, align the leading edges of the transfer paper and the toner image with each other, and open the opening 1 where the transfer paper core passes between the transfer charger 3/ and the drum 1/, and then remove the toner image on the drum 1//. Transfer onto a transfer paper core. After the transfer is completed, transfer paper: 17
is guided to the conveyor belt 32, and further a pair of fixing rollers, 3
．． 3-/, 33-U, and after fixing the toner image by applying pressure and heating, the tray, ? u 17 discharge.

Further, after the transfer is completed, the drum /l is constituted by an elastic blade, and its surface is cleaned by a cleaning blade 3S before proceeding to the next copying operation.

Also, what about the image forming cycle at each operating point? To control the trowel, a drum clock pulse DOK is generated by a sensor /lb that optically detects the clock point of a clock board /ItL that rotates with the rotation of the drum l/.

Furthermore, as an operation cycle performed prior to the above-mentioned image forming cycle, after turning on the power switch) 48, the drum l
/ to erase residual charges and residual latent images on the surface of the drum 11 using the pre-exposure lamp, 2-3 and the pre-AC static eliminator, 2-1, etc., and before cleaning with the clean roller and cleaning blade 3S. Perform a rotation cycle. This pre-rotation cycle is a stand-alone operation that maintains the sensitivity of the photosensitive layer on the surface of the drum 11 properly and enables image formation on a clean surface. The number of rotations and the time can be changed automatically according to various conditions.

On the other hand, after the copying cycle for the number of sheets set using the number key 71 is completed, and in the subsequent post-processing cycle L7, the drum // is rotated several times and the AC charger 23 etc. There is a post-rotation cycle to remove the image and clean the surface of the drum /l'', electrostatically and physically cleaning it in preparation for the next copying operation.

Furthermore, the sensor groups 31 and 37 detect the upper cassette λ
4A, the lower force setting unit gB detects feeding errors near the transfer paper, skewed paper feeding, etc., and the sensor 3g
Detect the paper feed near the transfer section by 1.
The sensor 39 also detects a jam in the paper feed near the fixing unit.
A detection output signal is generated by detecting the reflected light from the transfer paper 27 received when the transfer paper 27 passes through the transfer paper 27 .

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 explained with reference to FIGS.

First, FIG. 2 shows an example of a schematic configuration of the main parts related to the present invention in the tiP circuit that controls the copying machine configured as shown. In the illustrated circuit configuration, the AC power supply voltage is supplied from the power plug p connected to the AC power supply via the main switch SW/ to each AC load AL.
, Main motor M, exposure pump L, high voltage transformer T,
It is supplied to the fixing heater H, etc., and each load M, L,
T, H, ..., L are on/off control elements,
Solid state relay SSR/, 5sll,
5SRJ, 5SRQ, , -, 3!3Rn are mff+~, respectively. Furthermore, a DC stabilized power supply circuit PS/ supplies a power supply voltage to the control section of the copying apparatus.

PS,2 is connected via a low-voltage transformer T/ to a diode bridge p/, l)j and a capacitor O/, (1,
2, the AC power supply voltage is rectified and the DC voltage is supplied to the DC power supply voltage VB (+-14'V) and the control circuit power supply voltage V (+o (+&V) is increased.

Also, take it out from the input side of the diode bridge DJ -[
, AO power supply voltage is power supply monitor PM diode DJ
, D41 to rectify both waves, resistor R/, and capacitor C3 to smooth the signal, and then supply it to I2 and the terminals of comparator Q and 2 via resistor Rj. The comparator Q,
One terminal of 2 has a resistor R, ? ,, supplies the output voltage of the DC stabilized power supply circuit PS,2 divided by the R-da. The output terminal is connected to a DC stabilized power supply circuit PS via a resistor R5.
A diode supplied with the output voltage of 2 is connected to the terminal PB/ of the input capacitor PB.

Hikoo, diode I) J, D4 (, capacitor C3
, resistor R/-R& and the comparator output constitute an AC power supply monitor circuit P)4. here.

Capacitor C3, which forms the smoothing circuit, responds quickly enough to changes in the input ACQC power supply voltage to abnormal conditions such as interruption, etc., compared to the smaller capacity in a normal smoothing circuit. (7) Therefore, if the AC power supply voltage is in a normal state, the ten terminal of the comparator Q2 to which the AC power supply voltage is rectified and applied is the Do stabilizing power supply circuit PS.
, 2 is at a higher potential than one terminal to which the divided reference DC voltage is applied, and the output terminals of comparators Q and 2 are at a high logic level H, but if an abnormal state such as a drop in AC power supply voltage or a momentary interruption occurs, When this occurs, the relative potential on the input side of comparator Q2 is reversed, so the output terminals of comparators Q and J become low logic level L. AO in the source monitor circuit PM,
R/~RS is a resistance.

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 configured with a well-known one-chip microcomputer, and has a read-only memory RO in which necessary control programs are stored in advance.
M is composed of a random access memory RAM for storing various data, an accumulator AOC, and an input/output port for inputting and outputting various control signals. In addition, each input port PA, PR, PC, PD and each output port PE, PF.

PC, PH, and PI are all configured with t bits each. Therefore, the input port PA is connected to various keys required for copying operations, such as setting the number of copies, selecting a cassette, etc.
It is used to input copy button operations, etc., and the comparator output of the power supply monitor mentioned above is connected to the terminal P13/ of the input boat PB, and the detection output of the paper detection sensor JA, 37 mentioned above is connected to the terminal PB. Terminal PRE is the detection output of paper detection sensor Jj.

The detection outputs of the paper detection sensor O are connected to the terminal PBtI. Each paper detection sensor Jk, 3A, ? ?
, QO all have the same circuit configuration 7, and as shown in the figure, light emitting diodes 1. A reflective sensor using F:D and a phototransistor PTR can be used. In response to paper detection [Also, the phototransistor PTR drives the output transistor OTR (L2) and inputs the low logic level detection output] PBiC supply [-1, normally the input port pB terminal is set to high logic level . It should be noted that copy control human power 00I such as other sensor outputs and timing signals necessary for copy control is supplied to the other input ports PC and PD.

At that timing, ■Y large input input capo) is sent to the PA. Output capo) PF is segment decoder Q
The segment display DSP (to which this is connected) displays the number of copies (C0PY') and the number of set sheets (SET) through the terminal PC/ of the output port PG which controls the fixing heater through the transistor array AI of the amplifier t7. The output terminal of the comparator Q9 of the circuit THO is connected to the output terminal of the comparator Q9.One terminal of this comparator Qq is supplied with the temperature detection output voltage of the thermistor TH coupled to the fixing heater H. (2) Compare the resistors R, Rg, and f of 8 with the 7F value, and when the fixing heater H reaches a predetermined temperature, the outputs of the comparators Q and II are configured to become a low logic level L. The comparator output is connected to the silicon rectifier 5SRJ which energizes the fixing heater H through the transistor array A6. When the fixing heater H is turned off and the temperature of the fixing heater H falls below a predetermined temperature, the output of the comparator Q4 becomes a high logic level, driving the solid state relay 5SRI, and heating the fixing heater H with a predetermined temperature jet. .In addition, comparator Q4
The output of 1 is the input port of the controller Q/) P (also connected to the terminal PC/ of 3).

The controller Q/ determines the heating state of the fixing heater H and obtains 7. Furthermore, as mentioned above, the output of the comparator Qq is connected to the output port terminal PG/ of the controller Q/ via the transistor array A/.
7, the output of the comparator Q41 becomes a high logic level H, and while the fixing heater H is being heated, the controller Q
When the output port terminal PGt of / reaches a high logic level H, heating of the fixing heater H is accelerated, the temperature is rapidly raised, and the fixing heater H is forced to be turned off. Fixing heater control circuit T
In HO, RA-R9 is a resistor.

At the same time, the output port terminal PGj i of the controller Q/
d Connect output port terminal P to solid state relay SSR/ for main motor M via transistor array A2.
('T3' is connected to the silicon rectifier SSR, 2 for the exposure lamp through the transistor array ~ A3, and the output port terminal PG4' is connected to the solid state relay SSR, ? for the high voltage transformer T through the transistor array AII. Terminal PH/ of output thread F is connected to IM, #W, and warning light ALM for pressure drop, instantaneous interruption, etc. via transistor array 73. Also, connect to other output ports. The terminals PH to PHII and the output port P output copy control outputs CCO such as paper feed timing, optical system drive, and other drive output signals necessary for other copy controls. DOK is connected to the interrupt terminal INT of the controller Q/ to generate a timing signal for copy control for image formation.

The N1 source terminal V of the controller Q, which functions as described above, receives a stabilized rectified power supply voltage from a DC stabilizing IF control circuit PS, and an auxiliary power supply voltage from an auxiliary power supply E such as a battery. Diode In to prevent mutual reverse flow
and commonly supplied via DA. The auxiliary power supply voltage E is set to a voltage value slightly lower than the stabilized rectified power supply voltage VC++. When the rectification voltage Voc is output normally, the auxiliary power supply F consumes no power. Make sure it doesn't happen. The power source I1 supplied to the controller Q/, the voltage V^ required, are as described in 1. above. power supply monitor circuit P
M and warning indicators hI, u: These are common to the supplied rectified power supply voltage VnO, and if an abnormal situation such as a drop in AC power supply voltage or a momentary power outage occurs, the controllers Q and / will be activated. Power supply monitor circuit PM and warning indicator AL
The auxiliary power supply voltage from the auxiliary power supply E is also supplied to M to maintain the normal operation of the auxiliary power supply I2. Note that the above-mentioned transistor array A/~A6 can be constituted by resistors R/R/A and transistors TR/ and TR as shown in FIG. 2A.

Next, an example of the voltage waveform when the input AO11 in the copying machine electric circuit shown in the second diagram described above, the source voltage is new and a drop occurs, and the power supply monitor circuit PM from the comparator Q2 will be explained.
FIG. 3 shows the corresponding output signal waveforms of the . As shown in the figure, when the AC power supply voltage is normal, the power supply monitor circuit PM outputs a high logic level H output signal ρ1.
In an abnormal state such as a one-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 second figure for driving the copying apparatus shown in the first figure is shown separately in FIGS. 9 and 3. In the illustrated flowchart, m source switch S
Clear the random access memory RAM for the power-on PC memory in which the W/ was inserted (7. In step λ of Tatsuta, key manual input such as the set number of copies, copy start instruction, cassette selection, etc. is processed, and the set number of copies is displayed. The segment display DSP is turned on, operations such as cassette size etc. are displayed, and the process moves to step 3.In step J, the power supply is monitored and processed by a subroutine shown separately in FIG. In the illustrated subroutine for power supply monitoring, first, in step SO, it is checked whether the input AOi source voltage E is input normally or not at the terminal PB/ of the input capacitor (PR). As mentioned above, when the input AO power supply voltage is in a normal state, the power supply monitor output signal supplied to the input port terminal PR/ is at a high logic level H, so the result is YES 1 at step Sθ, if Immediately, the main routine shown in No. 1 is returned to, and the step is started, but the input AO1
i% An abnormal state such as a drop in the source voltage or a momentary interruption (at this time, the input port terminal Pf3/ is at a low logic level L, so the result is NO at step left θ, and the process moves to step 31, which is a false step) In the left /, a timer °I'M built in the controller Q and / is set to, for example, a power cycle kOHy, (7) <19 cycles goms.This timer setting time is determined by the ACvL source, DC
The stabilized power supply circuit PS/ can be set to any desired value depending on the drive type of the copying machine, etc. Next, in step 5, the timer is clocked internally in the controller Q, i. It starts based on the clock signal, and then in steps 3 and 7, it is checked whether or not the timer TM has finished counting, and the IJO is started, so to speak, as Stella 7.37.
Then, the state of input Act@' and voltage is checked again. Therefore, if the input AUN and source voltage have not returned to the normal state even after the timer TM finishes counting, step 3, jJ, ! ; Step 7: Continuing timer TM's timing,
When the timer TM completes the time measurement in step S3, the process moves to step tp, where a flag F/B indicating a power supply abnormality is set.
is set, and in step hs, the output port terminal PR/ is set to light up the warning indicator ALM, and the output port terminal PG is set to turn on the fixing heater H.
After / is set, the process moves to step S6. In step s6, those output port terminals PH/
, Reset all output port terminals except PG/. 15. Therefore, when the device is copying, turn off the main motor, exposure lamp, etc. immediately (see step 7).
2. Prevent damage to the copying machine from malfunctioning due to abnormal conditions such as a voltage drop or instantaneous interruption of the AC'nt power supply.

On the other hand, the step introduction of the above-mentioned timer timer Lujin,
,! T,? and A during the prescribed wounding period in Tough.

When the power supply returns to the normal state, the answer is YES in step 7, the process moves to step sgζ, resets the timer fTM1, and then returns to the main routine. That is, 1! in the middle of a predetermined period of time after detecting an abnormal state of the input AC power supply voltage! When the power supply voltage returns to the normal state, it operates so as not to determine that an abnormal state has occurred, and 1! # Even if the voltage is interrupted within a short period of time and no fault has actually occurred, it is determined that an abnormal situation has occurred and the normal copying operation is resumed. It is. In addition, although the above-mentioned erroneous judgment was prevented by using the time length of the timer TM, the number of occurrences of the power supply abnormality signal was counted and the normality recovery within a predetermined count value was prevented. After completing the above power supply monitor subroutine, which can be configured to prevent erroneous judgments, the process moves from step 3 to step 1, where the flag F/B is checked (
2, it is determined whether or not there is an abnormal state in the m source, and if an abnormal state in the vL source is detected by the power supply monitor circuit PM at each step and month (as a result); ygF/ If B=/, the process moves to step t, and the power supply monitor circuit P
Check whether the power supply has returned to the normal state according to the detection output of M, and if the power supply has not returned to the normal state for 1 m, repeat the process of step d and step g until the power supply returns to the normal state. Repeat. Next, when the power returns to normal state, the flag F/B is reset in step 9, and the output port terminal PHt, which should turn off the warning indicator ALM, is reset at step 9/θ and l/. Output port terminal PG where fixing heater H should be turned on
/ is reset (7), and the process proceeds to step S via step DA. In step j, it is checked whether or not it is in stop mode, for example, whether there is paper in the cassette, whether there is a jam, etc., and if it is not in stop mode, it moves to the step base, and supplies it to the input port terminal PC/. The fixing heater H reaches a predetermined fixing temperature in response to a control signal from the fixing heater control circuit THO, which is the fixing heater control circuit THO.
, and check whether the predetermined fixing temperature is reached L7.
If so, the process moves to step 7 and it is checked whether the copy command button has been pressed.

The process in step 7t is a so-called standby cycle, and even if an abnormal condition such as voltage drop or instantaneous interruption of the input AC power supply as described above occurs during this standby cycle, 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 core moves to the main motor M by setting the output port terminals PG and 2 to start the copying operation.
is turned on, and further, the output port terminal PGJ is set to turn on the high voltage transformer T, and the process moves to step /3. In step /J, the same power monitor subroutine as in step 3 is performed again.
Next, the flag F/P is used to check whether or not there is an abnormal state of the power supply in the step core, and if an abnormal state of the m source has occurred (5), the controller Q/ All output ports are reset to immediately stop the copying operation, the warning indicator ALM and the fixing heater H are turned off, and the transition is made to the step core as shown in the figure.Furthermore, in step /9, the flag F/ As a result of checking B, if no abnormal state of the power supply has occurred, proceed to step 15 °r,
A pre-copying rotation process, that is, a photoconductor pre-cleaning process is performed, and then, in step 1A, it is checked whether or not the child pre-rotation process has been completed. However, if the pre-rotation process has been completed, a paper feed control process for transporting the transfer paper from the cassette is performed in step 1, and then, in steps /g and /9, Check whether or not power supply abnormality is detected by power supply monitor ζ using flag F/'B.
Shifting to 〇, copy control processing, that is, a series of image forming processing steps in which a latent image on the photoreceptor is developed, fixed, and transferred to transfer paper by exposing the original to form a recording material, is further carried out. The power status can be checked in Step 3 and 2.2, or the subroutine for checking the power status can be constantly executed during the above-mentioned copying process9.Next, in Step 3, the operator It is checked whether or not copying of the set number of copies has been completed I7, and if it has been completed, a post-copying rotation process is performed at step J, and then the power state is checked at step O and roller. Check to see if the post-rotation process has finished [7] in the step core, and if it has, in step 2g, output to turn off the main motor M and the pressure transformer T, respectively. 2, PG, ? to port terminal P? is reset, and the process returns to step 1-2 in the copy standby routine via step 2q.

The process mentioned above is a copying cycle, but if an abnormal state of the power supply occurs during this copying cycle, the process moves to step 9 as shown in the figure. However, at that point, as mentioned in [7], in order to immediately stop the copying operation, the main motor M, high-voltage transformer T, and other Turn off the photo control signal and turn on the warning indicator AIJA.
Since the fixing heater H is turned off at step 7, step 9 (
The answer is YES, and the process moves to step 30.
Check whether ffQ has returned to normal state.

If 1 is 1 and the power supply has returned to the normal state, reset the flag F'/R in step 3/7.
Reset the output port terminal PH/ to turn off the warning indicator ALM. At this point, the fixing heat H cannot be turned on yet. Next, in step 32, it is checked whether the settings and number of copies have been completed (1-). In other words, if the power supply becomes abnormal 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 not been ejected, the transfer paper may remain in the conveyance path. However, if the set number of sheets is being calculated in the middle, there may be some transfer paper left inside the machine, and if the conveyance path is long, there will be a lot of transfer paper left in the conveyance path.
There may also be cases where the toner remains stuck in the fixing heater H.

[In such a case, if you do not forcibly turn off the fixing heater H, the transfer paper may be burnt or damaged by winding it around the fixing roller.Next, in step 3.2, set The number of sheets 'i# is completed [If it is 7,
Proceeding to step 33, the main motor M and high voltage transformer T are turned on, and then, in step 3, the timer TM is operated for a predetermined period of time, and after the operation of the timer TM is completed, the process proceeds to step 33. Then, turn off the main motor M and the high voltage transformer T at step L7, return to the step controller, and proceed to the next copy standby routine. Furthermore, the step? ,? , J<< , ,? In &, the photoconductor is rotated for a predetermined period of time to stop the copying operation 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 M'' stops, the M'' image on the photoreceptor becomes non-uniform, and this prevents it from becoming a memorized image and having an adverse effect when forming the next latent image.

That is, in the copying apparatus of the present invention, when an abnormal state of the power supply occurs in the middle of a copying operation (1), the operation of the copying apparatus is stopped, and then when the power supply returns to a normal state (7),
To prevent uneven charging of a photoreceptor by automatically performing photoreceptor cleaning rotation for a predetermined period of time. If the answer is NO in step 3, the process moves to step 36 shown in FIG. 7. [7] The output port terminal PG2 for turning on the main motor M is set. That is, as mentioned above (
As mentioned above, if the operation is stopped in the middle of the transfer operation, the transfer paper remains in the conveyance path, so the main motor M
is turned on to drive the transport mechanism and eject the transfer paper out of the transport path.
, Jg, , 7q, the paper sensor installed on the conveyance path sews until it is confirmed that all the residual transfer paper has been discharged, and when the discharge is completed, the fixing heater H is turned on for the first time in step IIo. Set the output port terminal PG/ for. That is, as described above, by turning on the fixing heater H after all the residual transfer paper in the copying device has been discharged, burnout of the fixing heater roller and the residual transfer paper itself due to the residual transfer paper can be prevented. Next, in step 1/, 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 a predetermined fixing temperature, the cleaning rotation is continued as described above, and when the fixing device reaches the predetermined fixing temperature, step ? 7, the paper feed control is performed so as to continue the remaining copying operations, and the 5th 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 device 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 power supply voltage drop or momentary power outage is detected while the operation is stopped, the recording operation will be immediately interrupted if the recording operation is in progress, and a failure of the recording device due to the power supply voltage drop or momentary power outage will occur. When the power returns to a normal state, the remaining recording operations are automatically restarted, and when the recording operation is resumed, processing such as cleaning and rotation of the photoreceptor is automatically performed, and the recording operation is interrupted. To ensure safety, the recording paper remaining in the conveyance path is automatically ejected, and the fixing heater, etc. is turned on after being ejected. By not responding to the detection of voltage drops or instantaneous interruptions that do not interfere with control, recording operations can always be performed in the best and most optimal state in the event of a power supply abnormality. be able to.

[Brief explanation of the drawing]

FIG. 1 is a 0111 cross-sectional view showing an example of a schematic configuration of a copying device to which the present invention is applied, FIG. 2 is a waveform diagram of the copy binding, and FIGS. q and 3 are operation control of the copying device fff according to the present invention. 2 is a flowchart separately showing an example of the process. //...drum, 1.2...shaft, /3
・・Arrow, /da・・Document stand glass plate. /! f, 17...Scanning mirror, /A...Illumination lamp, /l...Lens /9, 20.
...mirror, edge...exposure section, here...charger, 13...static eliminator, 21...exposure lamp 1.2S...developing unit, 26...cassette. Core Transfer paper, , 2g...Paper feed roller, K9, 30...Register roller, 3/...Transfer static eliminator, 3.2...Transport belt, 33...Fixing roller, J4' ··tray,
3! r...Cleaning blade, 36~3t...Sensor, 4'? ...switch, 7.
2...Several keys, -Here...Front static eliminator,
Coco J...Pre-exposure lamp, MS...Power switch, P...Power plug, S
W/...Main switch, AL...AC load,
M...Main motor, L...Fog light lamp. T...High voltage transformer, H...Fusing heater. SSR...Solid state relay, psi,
, psp...Stabilized power supply circuit, T/...Low voltage transformer, D/~D6...Diode, C/~03 capacitor, R/~R3...Resistor, FA-PE...Input port, PF -PI...Output port, TH...Thermistor, Q/...Controller, Qco+QII...Comparator, Q, 3...Decoder. A/-JA...Transistor array, ACO...Accumulator. ROM...Read-only memory, RAM...Random access memory, ALM...Warning indicator, PM...Itt source monitor, LED...
・Light emitting diode, PTR...phototransistor, OTR...output transistor, KEY...key,
I) SP...Segment display, THO...Fusing heater control circuit, E...Auxiliary power supply, TM timer.

Claims (1)

[Claims] Photoconductor K (?In a recording device that performs exposure to form an image and records it, a detection means for detecting an abnormal state of the power supply voltage supplied to the recording device, and a detection means for detecting an abnormal state of the power supply voltage by the detection means. comprising a stopping means for stopping the recording operation of the recording device in accordance with the above, and an auxiliary power supply means for maintaining the operation of the stopping means and the detecting means,
A recording apparatus 0 characterized in that when the abnormal state of the power supply voltage is resolved, the charge on the photoreceptor is removed for a predetermined period of time.