JPH0572844A - Image forming device - Google Patents

Abstract

PURPOSE:To facilitate restarting after service interruption is over at time of service interruption in a commercial electric power source. CONSTITUTION:A copying machine is constituted so that, electricity supplying time of uninterruptive power supply is extended by reducing electricity consumption at the time of service interruption, the cutting off of the commercial electric power source is notified to a user, ejection is completed so that a transfer paper which is being copied is not left in the machine, a photosensitive body is initialized so as not to impart any adverse effect on the photosensitive body, various information is saved in a non-volatile memory so that a job which was being carried out before can be continued at the time the electricity feeding is started again, and a shutting down process to stop electricity supply is carried out to prevent deterioration of battery due to excessive discharging when the necessary processes are finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for forming an image by reading an image from a document, developing the image on a photosensitive member, transferring the image onto a transfer sheet and fixing the image.
The present invention relates to a so-called copying machine, and more particularly, to an image forming apparatus that can efficiently use an uninterruptible power supply during a power failure.

[0002]

2. Description of the Related Art In a conventional image forming apparatus, when a commercial power source experiences a power failure or a momentary interruption for a long period of time, the machine operation is stopped at that point, and if the image forming operation is being performed, the machine is being transported into the machine. There is a very high possibility that the transfer paper of No. 1 remains, the photoconductor remains at a high potential, or the toner remains attached.

[0003]

When the power is restored from such a state (shut-off), if transfer paper remains, it will cause a jam (paper jam), and the user needs to perform this removal work. If an attempt is made to continue the previous copying operation, operations such as resetting the number of copies are required, leading to a drop in operability.

Further, if the photoconductor is left uninitialized, there is a possibility that the process conditions during the subsequent image formation may fluctuate and the subsequent copying operation becomes unstable.

Further, in a system in which data such as jam information is lengthened or a device condition is remotely diagnosed, jam information may be erroneously collected, and the accuracy of the reliability data of the system may be impaired. there were.

In order to solve such a problem, it is currently under consideration to install an uninterruptible power supply for supplying power in place of the commercial power supply at the time of power failure.

However, since the capacity of the uninterruptible power supply is limited, there is a problem that the battery part of the uninterruptible power supply goes up when the equipment is normally operated for a long time.
Further, in order to solve the problem, a very large capacity battery must be used, which is inefficient.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to efficiently use an uninterruptible power supply in order to facilitate restarting after a power failure. It is to provide an image forming apparatus that can do this.

[0009]

In order to achieve the above object, the present invention is characterized in that an image forming apparatus for reading an image from a document based on a power source rather than a commercial power source and forming the image on a transfer means. When the power supply from the commercial power supply is cut off, the cutoff of the power supply is detected, and after the power cutoff, uninterruptible power supply means for supplying power for a predetermined time, and when the power cutoff is detected by the uninterruptible power supply means, A predetermined power-off process (shutdown process) different from the normal image forming process is executed, and after the power-off process is completed, control is performed so that the power supply from the uninterruptible power supply unit is cut off. And a control means.

Then, the shutdown process is
Mainly, the process of reducing the power consumption and extending the power supply time by the battery, the process of completing the discharge so as not to leave the transfer paper being copied in the machine, and the photoconductor The process includes a process of completing initialization, a process of saving various information in a non-volatile memory so that a previous job can be easily continued when power supply is resumed, and a process of notifying a user that commercial power has been cut off.

According to the above configuration, it is possible to efficiently restart the image forming apparatus after a power failure by using an uninterruptible power supply having a limited capacity.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an image forming apparatus (copier) according to the present invention will be described with reference to the drawings.

A copying machine in this embodiment will be described with reference to the drawings.

FIG. 1 is a block diagram of the entire digital copying machine,
FIG. 2 is a plan view and a side view of a writing section in the digital copying machine.

First, a schematic structure of a digital copying machine will be described with reference to FIG.

The digital copying machine includes a copying machine main body (I), an automatic document feeder [ADF] (II), as shown in FIG.
It consists of four units, a sorter (III) and a double-sided reversing unit (IV).

The copying machine main body (I) includes a scanner section, a writing section, a photoconductor section, a developing section, a paper feeding section, and the like. Next, the configuration and operation of each unit will be described. The scanner unit is equipped with a reflecting mirror 1, a light source 3, and a first mirror 2, and is equipped with a first scanner that moves at a constant speed, a second mirror 4 and a third mirror 5, and is a first scanner of the first scanner. It has a second scanner that moves following the first scanner at a speed of / 2. An original document (not shown) on the contact glass 9 is optically scanned by the first scanner and the second scanner, and the reflected image is guided to the lens 7 via the color filter 6 and then on the one-dimensional solid-state image pickup device 8. Form an image.

A fluorescent lamp or a halogen lamp is used as the light source 3, and a fluorescent lamp is generally used because of its stable wavelength and long life. Although the reflecting mirror 1 is attached to one light source 3 in this embodiment, two or more light sources 3 may be used. Since the solid-state image pickup device 8 has a constant sampling clock, the fluorescent lamp has a bad influence on an image unless it is turned on at a higher frequency, so that a high frequency one is used.

As the solid-state image pickup element 8, generally C
CD is used. Since the image processing read by the solid-state image sensor 8 is an analog value, analog / digital (A / D) conversion is performed, and various image processing (binarization, multi-value conversion, gradation processing conversion) is performed on the image processing board 10. Doubling, processing, editing processing, etc.) is performed and converted into a digital signal as a set of spots.

In order to obtain color image information, in the present embodiment, a color filter 6 which transmits only information of a required color is arranged so that it can be taken in and out in the optical path guided from the original to the solid-state image pickup device 8. Color filter 6 according to the scanning of the document
You can take out and put in and operate the functions such as multiple transfer and double-sided copy each time, and you can create a wide variety of copies.

In some cases, a color original is read by using a 3-line CCD or the like in order to obtain three pieces of RGB information at the same time.

Explaining the writing section, the image information after the image processing is written on the photosensitive drum 40 in the form of a set of light points by raster scanning of the laser light in the optical writing section.

2A and 2B show a writing section, FIG. 2A is a plan view and FIG. 2B is a side view. The laser light emitted from the semiconductor laser 20 according to the image signal converted into the digital signal is converted into a parallel light flux by the collimator lens 21, and is shaped into a constant light flux by the aperture 32. The shaped laser light enters the polygon mirror 24 in a form compressed by the first cylinder lens 22 in the sub-scanning direction. The polygon mirror 24 has an accurate polygonal shape and is rotated in a certain direction at a constant speed by a polygon motor 25. This rotation speed is determined by the rotation speed of the photosensitive drum 40, the writing density, and the number of faces of the polygon mirror 24.

The reflected light of the laser light incident on the polygon mirror 24 is deflected by the rotation of the polygon mirror 24. The deflected laser light is reflected by the fθ lens 26a,
The light is sequentially incident on 26b. The fθ lenses 26a and 26b are
The scanning light having a constant angular velocity is converted so as to scan the photoconductor drum 40 at a constant speed, and an image is formed on the photoconductor drum 40 so as to be a minimum light spot. Further, the fθ lenses 26a and 26b are
It also has a face tilt correction mechanism.

The laser light that has passed through the fθ lenses 26a and 26b is guided to the synchronous detection light input section 30 by the synchronous detection mirror 29 outside the image area, propagated to the sensor section by the optical fiber, and serves as a reference for the cueing in the main scanning direction. The synchronization detection is performed, and the synchronization signal is output. The image data for one line is output after a fixed time after the synchronization signal is output, and one image is formed by repeating this process.

3A and 3B show examples of the layout diagram and the optical path diagram of the writing unit.

In the photosensitive portion, a photosensitive layer is formed on the peripheral surface of the photosensitive drum 40. Organic photoconductors (OPC), α-Si, Se-Te, etc. are known as photosensitive layers having sensitivity to a semiconductor laser (wavelength 780 nm), and the organic photoconductor (OPC) is used in this embodiment. ing.

Generally, in the case of laser writing, there are two types of processes: a negative / positive (N / P) process of shining light on the image part and a positive / positive (P / P) process of shining light on the background part. Adopts the former N / P process.

The charging charger 41 is of the scorotron type having a grid on the side of the photoconductor and is a photoconductor drum 4
The surface of No. 0 is uniformly (-) charged, and the image forming portion is irradiated with laser light to reduce the potential of that portion. Then, the background portion of the surface of the photoconductor drum 40 has a potential of -750 to -800V and the image portion has a potential of about -500V.
An electrostatic latent image is formed on the surface of 0. Then, the developing device 42
A bias voltage of -500 to -600 V is applied to the developing roller by a and 42b, and the toner charged to (-) is attached to the electrostatic latent image to visualize the electrostatic latent image.

Explaining the developing section, the apparatus of this embodiment is provided with two developing devices, a main developing device 42a and a sub developing device 42b. In the case of a single black color, the sub-developing device 42b and the toner replenishing device 43b are removed. In this embodiment having two developing devices, black toner is put in the toner replenishing device 43a which is paired with the main developing device 42a, and the sub-developing device 4 is used.
By inserting color toner into the toner replenishing device 43b paired with 2b, the development is selectively performed by changing the main pole position of the developing device of the other color during the development of one color.

Using this development, the color filter 6 of the scanner
By reading the color information by switching among the above, and by combining the paper transfer system multiple transfer and double-sided copy functions, it is possible to perform multifunctional color copying and color editing. Development of three or more colors can be achieved by a method of arranging three or more developing devices around the photosensitive drum 40, a revolver system of rotating and switching three or more developing devices, and the like.

The image visualized by the developing devices 42a and 42b is transferred onto the paper surface sent in association with the photoconductor drum 40 from the back surface of the paper by a (+) charge by the transfer charger 44. It The transferred paper is AC-eliminated by a separation charger 45 which is held integrally with the transfer charger 44, and separated from the photosensitive drum 40.

The toner remaining on the photosensitive drum 40 without being transferred onto the paper is scraped off from the photosensitive drum 40 by the cleaning blade 47 and collected in the attached tank 48. Further, the potential pattern remaining on the photoconductor drum 40 is erased by irradiating it with light from the static elimination lamp 49.

Further, a photo sensor 50 is provided at a position immediately after the development. This photo sensor 50
Is composed of a pair of a light emitting element and a light receiving element, and detects the reflection density on the surface of the photosensitive drum 40. This is because the optical writing unit writes a certain pattern (for example, a pattern of black or halftone dots) at a position corresponding to the photosensor reading position, and the reflectance of the pattern unit after development and the photosensitive drum other than the pattern unit The image density is judged from the ratio of the reflectances of 40, and if the image density is low, a toner replenishment signal is output. Also,
If the density does not increase even after the replenishment, it is possible to detect it and detect the shortage of the remaining toner amount.

Explaining the paper feed section, in this embodiment, a plurality of cassettes 60a, 60b, 60c are provided, and the paper once transferred is passed through the re-feed loop 72 to enable double-sided copying or re-feed. There is.

When one of the plurality of cassettes 60a, 60b, 60c is selected and then the start button is pressed, the paper feed rollers 61 (61a, 61b, 61c) near the selected cassette 60 are selected. ) Rotates and is fed until the leading edge of the paper hits the registration roller 62. Although the registration roller 62 is stopped at this time, the registration roller 62 starts rotating at the timing of the image position formed on the photoconductor drum 40, and feeds the paper to the peripheral surface of the photoconductor drum 40. After that, the toner image on the paper is transferred at the transfer portion, and is suctioned and conveyed by the separation / conveyance portion 63, and the transferred toner image is transferred onto the paper surface by the fixing roller composed of a pair of the heat roller 64 and the pressure roller 65. Establish.

That is, power is supplied to the heat roller 64 of the fixing roller as described later, and the heat roller 64 is heated in proportion to the magnitude of the power supply.
Further, the heat roller 64 is assumed to maintain the fixable temperature for a while even after the power supply is stopped.

The paper thus transferred is guided by the switching claw 67 to the paper discharge port on the sorter (III) side during normal copying. On the other hand, at the time of multiple copy, the direction is changed by the switching claws 68 and 69 and is not guided to the sorter (III) side but passes through the lower re-feeding loop 72 and is guided to the registration roller 62 again.

In the case of double-sided copying, there are two cases, one is only using the copying machine main body (I) and the other is using the double-sided reversing unit (IV). Here, the former case will be described. The paper guided downward by the switching claw 67 is further switched by the switching claw 68.
Is guided downwards by the switch claw 69, and is guided to the tray 70 further below the refeed loop 72 by the next switching claw 69. And roller 71
Is re-fed in the opposite direction by reversing, and is guided to the re-feeding loop 72 by switching the switching claw 69 and fed to the registration roller 62.

The automatic document feeder ADF (II) automatically guides documents one by one onto the contact glass 9 and automatically discharges them after copying.

The originals placed on the original feeding table 100 are aligned in the widthwise direction by the side guides 101.
The placed originals are separated and fed one by one by the rollers 104, conveyed to a predetermined position on the contact glass 9 by the rotation of the conveyor belt 102, and positioned.

When the copying of the predetermined number of sheets is completed, the original is discharged to the discharge tray 103 by the rotation of the conveyor belt 102 again. The size of the document can be detected by counting the position of the side guide 101 and the document feed time.

The sorter (III) is a device for selectively feeding the copy paper discharged from the copying machine main body (I), for example, in page order, page by page, or to preset bins 111a to 111x. .. The copy paper sent by the plurality of rollers rotated by the motor 110 is guided to the selected bin 111 by switching the claws near the entrance of each bin 111.

Explaining the double-sided reversing unit (IV), as described above, the copying machine main body (I) can only perform single-sided double-sided copying. It is possible to make a copy.

When making a double-sided copy for a plurality of sheets collectively, the paper guided downward by the paper discharge roller 66 is sent to the double-sided reversing unit (IV) by the next switching claw 67. The paper that has entered the double-sided reversing unit (IV) is ejected by the paper ejection roller 120 into the tray 123.
Accumulated on top. At that time, the feed roller 121 and the side alignment guide 122 align the copy paper vertically and horizontally. The copy sheets accumulated on the tray 123 are re-fed rollers 124.
Will be re-fed when the back side is copied. At this time, the copy paper is directly guided to the refeed loop 72 by the switching claw 69.

Next, an electrical equipment control unit for controlling each unit of the above-mentioned copying machine will be described with reference to FIGS. 4, 5 and 6.

The electrical equipment control section has two CPUs as a control unit of the copying machine, and the first CPU 140 (sequence CPU) controls sequence-related control and the second CP.
The U 141 (main CPU) controls operation-related operations. CPU140 and CPU141
And the serial interface 143 (RS232
Connected by C).

5 and 6 are more specific block diagrams of the electrical equipment control shown in FIG.

As shown in FIGS. 5 and 6, the main control plate 1
Reference numeral 51 denotes the first and second CPUs that control the entire system.
It has 140 and 141. As shown in FIG. 4, ROMs 153 and 155 are connected to the first and second CPUs 140 and 141, respectively.
In the OM 155, an uninterruptible power supply program (shutdown sequence program), which will be described later, is held in addition to the normal control program. And
The second CPU (main CPU) 141 has a RAM 156 as a non-volatile memory.

The main control board 151 has a scanner control circuit 15 for mainly controlling the scanner section.
7. AC drive plate 159 for controlling the fixing roller and the like, paper feed control plate 16 for controlling paper feed
1, a sorter control plate 163 for controlling the sorter (III), a double-sided control plate 165 for controlling the double-sided reversing unit (IV), etc. are connected to the scanner control circuit 157. Display unit 16 including transfer paper conveyance and discharge control, and a specific display (power failure) described later.
An ADF control plate 169 for performing the control of No. 7 is connected. The main control plate 151 has an initialization drive plate 1 for initializing the photosensitive drum 40.
71 and a bias control plate 173 that controls the bias to the developing unit are connected.

An uninterruptible power supply unit 145, which is one of the gist of the present invention, is connected to the main control board 151 according to the uninterruptible power supply program in the event of a power failure. Has been done.

Next, the sequence control will be described.
The sequence control by the first CPU 140 sets and outputs conditions relating to the timing of paper conveyance and image formation. Therefore, the first CPU 140 includes a paper size sensor, sensors related to paper conveyance such as paper discharge detection and registration detection, A duplexer unit, a high-voltage power supply unit, a driver such as a relay, a solenoid, a motor, a sorter unit, a laser unit, and a scanner unit are connected.

The inputs related to the sensors include a paper size sensor that detects the size and orientation of the paper loaded in the paper feed cassette and outputs an electric signal according to the detection result, and paper conveyance such as registration detection and paper ejection detection. Sensors, sensors that detect the presence or absence of sub-lines such as oil end and toner end,
In addition, there are inputs from sensors that detect machine abnormalities such as door open and fuse blown.

The duplex unit includes a motor for aligning the paper width, a paper feed clutch, a solenoid for changing the transport path, a paper presence detection sensor, a side fence home position sensor for aligning the paper width, and a paper. There are sensors related to the conveyance of the.

The high-voltage power supply unit includes a charging charger, a transfer charger, a separation charger, and an adding device that adds predetermined high-voltage power to the output of the developing bias electrode by the duty obtained by PWM control. The PWM control is controlled so that the feedback value of each high-voltage power output is converted into a digital value by A / D conversion and becomes equal to the target value.

Regarding the driver, a paper feed clutch,
There are registration clutch, counter, motor, toner replenishing solenoid, power relay, fixing heater, etc.

The sorter unit (III) is connected to the first CPU 140 via the serial interface as described above.
The paper is conveyed at a predetermined timing by a signal from the sequence and discharged to each bin.

As the analog input to the first CPU 140, a fixing temperature, a photo sensor input, a laser diode monitor input, a laser diode reference voltage, feedback values of output values from various high-voltage power supplies, and the like are input. On / off control or phase control of the heater is performed so that the temperature of the fixing unit becomes constant by an input from a thermistor in the fixing unit. The photo sensor input is for detecting the density of the pattern by inputting a photo pattern created at a predetermined timing with a phototransistor, thereby controlling the toner density by controlling the toner supply clutch on / off. I'm doing it. The toner end is also detected based on this density. The analog input of the A / D converter and the first CPU 140 is used to keep the power of the laser diode constant.
This is a preset reference voltage (this voltage is set so that the laser diode is 3 mW in this embodiment).
Further, the monitor voltage when the laser diode is turned on is controlled to match.

Next, the operation-related control will be described. The second CPU 141 controls the plurality of serial ports and the calendar IC. In addition to the sequence control CPU 140, an uninterruptible power supply unit 145, which is a feature of the present invention, an operation unit, a scanner unit, an application, an editor, etc. are connected to the plurality of serial ports.

The operation unit has a display for displaying the key input by the operator and the status of the copying machine, and informs the main CPU 141 of the key input information by serial communication. Based on this information, the main CPU 141 determines whether the indicator of the operation unit is turned on, turned off, or blinks, and serially transmits it to the operation unit.
The CPU of the operation unit turns on, off, and blinks the display according to the information from the main CPU 141.

Further, the operating conditions of the machine are determined from the obtained information, and the information is transmitted to the CPU 140 performing the sequence control at the start of copying.

In the scanner section, scanner servo motor drive control, image processing, serial transmission of information relating to image reading to the main CPU 141, and interface processing between the ADF and the main CPU 141 are performed.

The application is an interface between an external device (fax, printer, etc) and the main CPU 141, and exchanges preset information contents.

The editor is a unit for inputting the editing function, and serially transmits the image editing data (masking, trimming, image shift, etc) input by the operator to the main CPU 141.

The calendar IC stores the date and time and can be called up at any time by the main CPU 141. Therefore, by displaying the current time on the operation unit display and setting the machine on / off time, It is possible to control the power on / off with a timer.

The gate array receives image data (DAT) through the following three paths in response to a select signal from the main CPU 141.
A0 to DATA7) and a sync signal are output. (1) Scanner control circuit → image control circuit In this case, 8-bit data from the scanner (however, 4b
It is also possible to use it or 1 bit) to synchronize the image signal sent continuously with the synchronization signal PMS from the laser beam scanner unit.
Output to the image control circuit in synchronization with YNC. (2) Scanner control circuit → application In this case, 8-bit data from the scanner (however, 4b
The image signal continuously transmitted by (it, 1 bit) can be output in parallel to the application. The application is connected to the input image data externally
Output to an output device such as a printer. (3) Application → image control circuit In this case, the application is 8-bit data from an externally connected input device (fax, etc.)
The image signal continuously transmitted by 1 bit) can be used as a synchronization signal PMSY from the laser beam scanner unit.
Output to the image control circuit in synchronization with NC.

In this case, the image signal from the outside is 1 bi.
In the case of t and 4 bits, it is necessary to perform a process of converting into 8 bit data.

FIG. 7 is a block diagram of an image scanner unit that processes image data detected by the solid-state image sensor (CCD) 8 in the scanner unit. CC
The analog image signal output from D8 is amplified and light amount corrected by the signal processing circuit 451 inside the image preprocessor (IPP), and converted into a digital multilevel signal by the A / D converter 452. This signal is corrected by the shading correction circuit 453 and applied to the image process unit (IPU) 454.

Image process unit (IPU) 45
A schematic block diagram of No. 4 is shown in FIG. The image signal applied to the IPU is high-frequency emphasized by the MTF correction circuit, electrically scaled by the scaling circuit, and applied to the γ conversion circuit. The γ conversion circuit optimizes the input characteristics according to the characteristics of the machine. The image signal output from the γ conversion circuit is converted to a predetermined quantization level by SW1 of the data depth switching mechanism. This switching mechanism switches to the three data types shown in FIG. The 4-bit conversion circuit outputs 4-bit data, and the binarization circuit converts the input 8-bit multivalued data into binary data by a preset fixed threshold value and outputs 1-bit data. 1 dither circuit
An area gradation is created using bit data. SW1 selects one of three data types and outputs it as DATA0 to DATA7.

The scanner control circuit 460 is the main CPU 1
The fluorescent lamp ballast 458, the timing control circuit 459, the electric scaling circuit of the IPU, and the scanner drive motor 465 are controlled according to the instruction from the controller 41. Fluorescent lamp ballast 458
Performs on / off and light amount control of the fluorescent lamp 402 according to an instruction from the scanner control circuit 460.

A rotary encoder 466 is connected to the drive shaft of the scanner drive motor 465, and the position sensor 462 detects the reference position of the sub-scanning drive mechanism.

The electric scaling circuit is the scanner control circuit 460.
The electrical scaling processing is performed according to the magnification data on the main scanning side set by.

The timing control circuit 459 outputs each signal according to the instruction from the scanner control circuit 460. That is, when reading is started, a transfer signal for transferring data for one line to the shift register and a shift clock pulse for outputting data in the shift register bit by bit are given to the CCD 8. Further, the timing control circuit 459 informs the image reproduction system control unit of the pixel synchronizing clock pulse CLK and the main scanning synchronizing pulse LSYNC.
And a main scanning effective period signal LGATE. This pixel synchronization clock pulse CLK is a signal which is almost the same as the shift clock pulse given to the CCD 8. The main scanning synchronization pulse LSYNC is almost the same as the main scanning synchronization signal PMSYNC output from the beam sensor of the image writing unit, but the pixel synchronization clock pulse CLK is used.
It is output in synchronization with. Main scanning effective period signal LGATE
Goes to a high level H at the timing when the output data DATA0 to DATA7 are regarded as valid data.

In this example, the CCD 8 outputs 4800 bits of effective data per line.

The scanner control circuit 460 is the main CPU 1
When the reading start instruction is received from 41, the fluorescent lamp for illumination 4
02 is turned on, the scanner drive motor 465 is started, the timing control circuit 459 is controlled, and the reading of the CCD 8 is started. Further, the scanner control circuit 460 is
The sub-scanning effective period signal FGATE is set to the high level H. This signal FGATE becomes low level L after the time required to scan the maximum read length (dimension in the A size longitudinal direction in this example) in the sub-scanning direction after being set to high level H.

FIG. 10 is a block diagram of the memory system of this apparatus. The image signal from the CCD 8 is output as 8-bit data through an image preprocessor (IPP) having functions of shading correction, black level correction, and light amount correction. This data is sent to multiplexer 1 (MUX
Selected in 1), high spatial frequency enhancement (MTF correction)
Function, speed conversion function (magnification), γ conversion function, data depth conversion function (8 bit / 4 bit / 1 bit conversion), processed by image process unit (IPU) and output to printer PR through MUX3 ..

In a system having a frame memory for image data, the image data from the IPU shown in FIG. 11 is temporarily stored in the memory device (MEM), taken out from the memory device (MEM) when necessary, and then sent to the printer (PR). ) Is configured to output to. A general method is to output the image data from the IPU to the printer (PR), simultaneously store the image data in the memory device (MEM), and perform the second and subsequent copies with the image data from the memory device (MEM). is there.

The present apparatus has a structure capable of data flow as shown in FIG. 12 so that both processed data and raw data from the IPU can be taken into the memory device. That is, the three multiplexers (MUs) in FIG.
X1, MUX2, MUX3) is configured so that the data flow can be changed. For example, in the case of outputting a copy in which the parameters of a plurality of IPUs are changed by one scan of the scanner, it can be achieved by the following procedure. (1) When scanning the scanner, set MUX1 to A and MUX2
Set B to MUX3 to A and output the first sheet. At this time,
Raw data enters the memory device (MEM) through MUX2. (2) For the second and subsequent sheets, the MUX1 is set to B, the data from the memory device (MEM) is put into the IPU, and is output to the printer (PR) through the MUX3. At this time, the IPU parameter is changed every time one copy is made.

This can be realized in this way.

When holding compact data such as 1-bit data, MUX2 is set to A and IPU is set.
Captures the output of memory into the memory device. In this case, the printer device switches to the binary data (1 bit) mode and copies. EXTIN and EXTOUT in FIG. 10 are an image data input signal from the outside and an output signal to the outside.

In FIG. 13, the compressor (COMP) and the decompressor (EXP) are connected to a memory unit (Memory Uni).
It is shown before and after y) so that compressed data other than actual data can be stored. In this configuration, the compressor (COMP) must operate at the scanner speed, and the decompressor (EXP) must operate at the printer speed. When storing actual data, multiplexer M
UX4 and MUX5 are each set to A, and when compressed data is used, each is set to B.

The memory unit shown in FIG. 13 has a structure as shown in FIG. A data width converter for handling the three image data types of FIG. 15 and code data that is compressed data is provided in a memory block (Memory).
I / O of Block). The direct memory controller (DMA1, DMA2) writes data to a predetermined address of the memory block and performs a read operation according to the number of packed data and the memory data width.

FIG. 15 shows the data type of image data. The speed of image data from a scanner or printer is usually 8 bit data, 4 bit
It is constant regardless of t data and 1 bit data. That is, the period of 1 pixel is fixed in the device. In this device, 1 from the MSB side of 8 data lines
Bit data, 4 bit data, 8 bit data and MS
It is defined as B packed. The blocks that pack and unpack this data into the data width (16 bits) of the memory block are the input data width converter and the output data width converter. By packing, the memory can be used according to the data depth, and the memory device can be effectively used.

FIG. 16 shows a compressor (COMP) and an expander (E).
Pixel process unit (PPU) instead of XP)
Is arranged outside the memory unit. PPU
Is a logical operation between image data (eg AN
A unit that realizes D, OR, EXOR, NOT) calculates memory output data and input data and outputs it to the printer, and calculates memory output and input data (eg scan data) and stores it again in the memory unit. I can do things. The output destination printer and the memory unit are switched by the MUX6 and MUX7. This function is generally used for image synthesis, and is used, for example, to place overlay data in a memory unit and overlay the scanner data.

FIG. 17 shows a configuration for storing image data using an external storage device. When you save the image data to the floppy disk, E in Fig. 10
From XTOUT through an interface (I / F), a file controller (File Control)
Floppy disk controller (FD)
Output to C), floppy disk drive (FDD)
Store it on the floppy disk above.

Under the control of the file controller, there are a hard disk controller (HDC) and a hard disk drive (HDD), which can be read and written on the storage medium of the hard disk.

The hard disk drive (HDD) stores format data and overlay data that are usually used frequently so that they can be used as needed.

FIG. 18 shows a configuration in which 100% recovery can be performed when the processing speeds of compression and expansion are not in time. At the same time as the scanner scanning, the compressed data and the image data enter the memory unit. The incoming data is stored in different memory areas, but the compressed data is stored in the decompressor (EX
P) and is expanded. When the processing time of the compressor (COMP) and the decompressor (EXP) is completed normally in time for all the data of one page to enter the memory unit, only the memory area of the compressed data remains and the area of the raw data is canceled. .. If the error detection circuit (Erro
If r Detect detects an error signal from the compressor (COMP) or decompressor (EXP), the compressed data area is immediately canceled and raw data is adopted.

The memory management unit (MMU) is a unit for controlling the memory so that two input data and one output data can be simultaneously input / output to / from the memory unit. This real-time verification of compression and decompression made it possible to use the memory area efficiently and reliably. In this embodiment, the memory management unit (MMU) allows dynamic allocation of the memory area, but two memory units for raw data and compressed data may be provided.

The configuration of FIG. 18 is most suitable for applications such as electronic sorting in which a plurality of pages are stored and output to a printer in real time, in which both the number of stored pages and the printing speed must be compatible.

Next, the uninterruptible power supply unit 145 described above
Will be described.

The uninterruptible power supply unit 145 supplies power for a predetermined time when the power supply is cut off due to a power failure or the like, and is a device similar to that used in a computer or the like.

As shown in FIGS. 5, 6, and 19, the uninterruptible power supply unit 145 is provided in the path of the general commercial power supply, and the power supply monitoring circuit 181 for detecting the interruption of the general commercial power supply and the above When the power supply monitoring circuit 181 detects interruption of general commercial power, it has a battery unit 183 and a DC / AC converter 185 for supplying the commercial power. The basic operation of the uninterruptible power supply unit 145 will be described with reference to the time chart of FIG. 19. The interruption detection signal from the power supply monitoring circuit 181 is sent to the main CPU 141 of the main control board 151, and the main CPU 141. Reads the uninterruptible power supply supply program (shutdown sequence) from the ROM 155, and controls each unit so that the battery unit 183 and the DC / AC converter 185 supply power to each place in accordance with the uninterruptible power supply supply program. Control.

When the shutdown sequence ends, the main CPU 141 supplies an end signal to the uninterruptible power supply unit 145, and the battery section 183 of the uninterruptible power supply unit that receives the end signal stops the supply of power. All systems power off.

Next, the uninterruptible power supply supply program, that is, the shutdown sequence will be described.

First, the position on the entire copy operation step of the shutdown sequence will be described.
As shown in the overall copy operation flowchart of FIG. 21,
When the interruption detection signal is sent from the uninterruptible power supply unit 145 to the main CPU 141 between the standby processing step and the post-copy processing step, the main CPU 1
At that time, the 41 shifts by interrupting the shutdown sequence shown below. In the shutdown sequence, the shutdown process described later is executed in step 203, the termination of the shutdown process is determined in step 205, and in the case of termination, an end signal is sent from the main CPU 141 in step 207, and the entire system power is turned off. (Step 2
09). That is, in the case of this embodiment, the shutdown sequence is executed by interruption in case of a power failure or the like. Further, the other operation steps in the entire copy operation flow (FIG. 21) are the same as those in a general digital copy, and therefore the description thereof will be omitted.

Next, the shutdown process in step 205 will be described.

First, as a precondition, in the digital copy as in the present embodiment, a large amount of electric power is consumed by the fixing heater, the motor, etc., so it is extremely difficult to maintain normal operation for a long time when the power is cut off. It requires a large capacity uninterruptible power supply, which is uneconomical and unrealistic.

Therefore, a special operation called a shutdown process is executed here in order to reduce power consumption and to prevent problems such as paper jams due to power failure or momentary interruption even with a small capacity uninterruptible power supply. There is.

In the case of this embodiment, the above-mentioned shutdown process is roughly divided into (1) processing for reducing power consumption and extending power supply time by the battery, and (2) notifying the user that the commercial power supply has been cut off. Processing, (3) processing for completing discharge so as not to leave transfer paper being copied in the machine, (4) processing for completing initialization of the photoconductor so as not to adversely affect the photoconductor, (5) When the power supply is resumed, various information is saved in the nonvolatile memory so that the previous job can be continued easily. (6) When necessary processing is completed, power supply is stopped to prevent deterioration due to over-discharge of the battery. There are 6 processes.

Therefore, the shutdown process will be described with reference to the flowcharts and time charts of the shutdown process shown in FIGS.

In the shutdown process, as shown in FIG. 22, in step 301, the power supply to the heat roller 64 of the fixing section is first turned off (cut off).
This is the AC under the control of the main CPU 141.
This is done via the drive plate 159.

The reason why the power supply to the heat roller 64 is turned off is that the largest power consuming element in the copy as in this embodiment is the fixing heater. In order to heat and press-fix the toner on the transfer paper, the fixing heater is usually controlled to a temperature of about 180 ° C. and a halogen heater of about 800 W is used.
Further, since the fixing heater has a relatively large heat capacity, the fixing temperature can be maintained for several copies even if the power supply is stopped.
In addition, there is a region where the fixing property is not guaranteed but the fixing roller is not damaged. (Refer to FIG. 24) By using this characteristic,
Even if the heater is not energized, the transfer paper inside the machine can be discharged, and power consumption can be reduced.

Therefore, in the shutdown process, the fixing heater is turned off.

Next, in step 303, as shown in FIG. 25, only the display of "power failure" is lit on the display unit 167. This is performed under the control of the main CPU 141 via the scanner control circuit 157 and the ADF control plate 169. The reason for only displaying the above power failure is that the shutdown process is a special operation, so it does not accept the user's operation as described later and the repeat copy is interrupted. It can be raised. However, the display consumes a lot of current, so I would like to turn it off if possible. In addition, it is not desirable to put a lot of display on the image in terms of operation during a power failure.

Therefore, here, during the shutdown process, only a specific display, that is, the power failure display is turned on, and all other lights are turned off.

Next, in step 305, it is judged whether or not the copy processing is being executed. If the copy processing is being executed, the repeat of the copy processing is interrupted in step 307. Then, in step 309, it is determined whether or not the transfer is being performed. If the transfer is in progress, the process returns to step 309. If the transfer is not in progress, the process proceeds to step 311 to wait for the transfer paper to be ejected, that is, the transfer paper is ejected. Control so that the discharging operation is continued until completion, and step 31
At 3, it is determined whether the discharge is completed. The reason for performing the series of processes in steps 305 to 313 is that the transfer paper is not left inside the machine. This is also one of the main reasons for installing an uninterruptible power supply.

The removal of the residual paper in the machine is the same as the processing of the jammed paper even though it is caused by the power failure, and it is the most unpleasant operation for the user. Therefore, in the shutdown process, it is necessary to continue the operations related to the conveyance and the ejection until the ejection of the transfer sheet in the machine is completed.

When the shutdown process is activated, the transfer paper in the machine can be in the following three states. (1) There is no image on it yet. (2) Image transfer in progress. (3) Image transfer is completed.

If only the discharge is performed, all the process means may be turned off to reduce the power consumption, and all the power may be allocated to the discharge. However, if a transfer paper sheet with an interrupted image is ejected, the user may feel uncomfortable and may be mistaken as an abnormal image.

Therefore, from the viewpoints of both reduction of power consumption and image guarantee, (1) If the image transfer is completed, the image is fixed without any problem, and thus a normal copy is made. (2) If the image is being transferred, this transfer is continued to make a normal copy. (It is still in the fixable area.) (3) If there is no image, it is necessary to make an invalid copy without transferring. Therefore, the series of processes (steps 305 to 313) as described above are performed.

The main CPU 1 executes the transfer paper discharging process.
Under the control of 41, it is performed via the scanner control circuit 157 and the ADF control plate 169.

Next, in step 313, if the discharging is not completed, the process returns to the previous step 311, and if the discharging is completed, the process proceeds to step 315 to initialize the photosensitive drum 40. In the initialization processing of the photosensitive drum 40, the charged portion on the photosensitive drum 40 is discharged by the charge eliminating lamp 49, and the portion on the photosensitive drum 40 where toner may remain is cleaned by the cleaning blade 47. To be done. At the same time, in step 315, because of the N / P process, a reverse bias (+) is applied as a developing bias to the uncharged portion of the photosensitive drum 40, and toner adhesion is prevented. This is performed through the initialization drive plate 171 and the bias control plate 173 under the control of the main CPU 141.

Next, in step 317, it is judged whether or not the photosensitive drum initialization processing is completed. If the initialization is not completed, the procedure returns to step 315,
If it has been completed, the process proceeds to step 319, and in order to make it easier to continue the job (processing) immediately before the power failure at the time of starting the power supply later, various information up to immediately before that is stored in the RAM 156 as a nonvolatile memory. .. This is the main CP
The processing is performed by the U 141 as information read / write processing.

With the above, the shutdown process in step 205 is completed, but as described above, in steps 207 and 209 of FIG. 21, the completion signal is sent from the main CPU 141 to turn off the entire system power supply. Become. This means that no matter what happens to the power supply after the shutdown process ends, there is no problem when copying is restarted.However, since power is supplied from the battery, over-discharging will cause deterioration of the battery. Inspire.

Therefore, at the end of the shutdown process, an end signal is sent to the uninterruptible power supply unit to stop power supply.

As a result, the use of the battery is minimized and deterioration due to overdischarge is prevented.

The description of the first embodiment is completed above, but the shutdown process can be modified in various ways as follows.

That is, as a first modified example, in the shutdown process, when a power cutoff signal is generated during copying, a new sheet feeding operation is prohibited, and an operation is performed so that image forming is completed for copying during image forming. Then, the image formation is not performed for the copy before the image formation, or as the second modification, when the power cutoff signal is generated during the copy, the power is supplied at least until the initialization of the photosensitive drum 40 is completed. It is also possible to complete the initialization of the photosensitive drum 40, or, as a third modification, drive only a specific display of the operation display and turn off the other when a power-off signal is generated. Is.

Next, a second embodiment of the image forming apparatus (copy) according to the present invention will be described. The second embodiment is different only in the shutdown process in the first embodiment and the other constitutional operation is the same as that of the first embodiment, and therefore the description thereof will be omitted.

In the shutdown process of the second embodiment, as shown in FIG. 26, when the interruption detection signal is sent from the uninterruptible power supply unit 145 to the main CPU 141 in step 501, the transfer paper is The main CPU 141 performs a copying operation stop process in which electric power is not supplied to units other than the units necessary for discharging. Next, in step 503, it is determined whether or not there is a transfer sheet in the copy. If there is no transfer sheet, this shutdown process ends, and if there is a transfer sheet, the process proceeds to step 505. It is determined whether or not during copying or after copying. Step 5 above
In 05, when copying is not performed or after copying, the process proceeds to step 507, where it is determined whether or not the paper is being fed, that is, the paper is slightly ejected from the paper feeding cassette and is being bitten by the registration clutch. If it is in the middle of paper, the process proceeds to step 509. In step 509, the pickup solenoid is turned on / off and the main motor is turned on under the control of the main CPU 141 via the paper feed control plate 161 shown in FIGS. In step 511, the transfer paper is conveyed and discharged to the outside of the machine through the fixing unit and the like. In addition, in step 505, when the copying is in progress or after copying, and in step 507 when the paper is not being fed, the above step 5 is performed.
Proceeding to 11, the transfer paper is ejected outside the machine. The shutdown process of the second embodiment is characterized in that the transfer sheet in the middle of feeding is conveyed downstream and discharged to the outside of the machine.
Further, it goes without saying that the pickup solenoid can be controlled so that only the transfer paper in the mid-paper feeding state is conveyed and no new paper feeding is performed thereafter.

It goes without saying that the shutdown process of the second embodiment and the shutdown process of the first embodiment can be used in combination as appropriate.

Next, a third embodiment of the image forming apparatus (copy) according to the present invention will be described. The third embodiment also differs from the first embodiment only in the shutdown process, and since the other constructional operations are the same as those in the first embodiment, the description thereof will be omitted.

In the shutdown process of the third embodiment, as shown in FIG. 27, in step 601, when the interruption detection signal is sent from the uninterruptible power supply unit 145, the original is placed on the contact glass 9. Paper is fed to the predetermined position, and when the scanning of the original is completed, it is judged whether or not an automatic original feeder (ADF) for discharging the original from the contact glass 9 is in operation. If the ADF is reset and exits and is in operation,
Go to step 603. Then, in step 603, it is determined whether or not the document is being fed, and if it is being fed, the process proceeds to step 611, the ADF is supplied with power from the uninterruptible power supply unit 145, and then step 613. 5, the paper feeding / conveying motor is turned on by the control of the main CPU 141 via the ADF control plate 169 and the scanner control circuit 157 shown in FIGS. 5, 6 and 7, and the original is fed to a predetermined position on the contact glass 9. , The process ends. Next, in step 603, if the original is not being fed, the process proceeds to step 605,
It is determined whether the document is being discharged. Step 605 above
In, if the sheet is not being discharged, the ADF is reset and the processing ends, and if it is being discharged, the process proceeds to step 607. In step 607, the ADF is supplied with power from the uninterruptible power supply unit 145, and then in step 609.
In FIG. 5, the ADF control plate 1 shown in FIGS.
Main CPU via 69 and scanner control circuit 157
By the control of 141, the paper discharge conveyance motor is turned on, the original is discharged from the contact glass 9, and the processing is ended.

The shutdown process of the third embodiment as described above can be used in combination with the shutdown process of the first and second embodiments as appropriate.

Next, a fourth embodiment of the image forming apparatus (copy) according to the present invention will be described. The fourth embodiment is also different only in the shutdown process in the first embodiment, and the other constituent operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

In the shutdown process of the fourth embodiment, as shown in FIG. 28, in step 701, when a cutoff detection signal is sent from the uninterruptible power supply unit 145, the uninterruptible power supply unit 145 outputs the shutdown signal. A predetermined power source is supplied to the fixing roller of the fixing unit, and in step 703, the temperature of the fixing roller is set to a predetermined set temperature lower than the normal temperature. This is based on the detection value of the fixing sensor as shown in FIGS. 5, 6, and 7, and the main CPU via the AC drive plate 159.
The feedback control of 141 is performed.

The shutdown process of the fourth embodiment as described above can be used in combination with the shutdown process of the first, second and third embodiments as appropriate.

Next, a fifth embodiment of the image forming apparatus (copy) according to the present invention will be described. The fifth embodiment is different from the first embodiment only in the shutdown process, and the other constituent operations are the same as those in the first embodiment, and therefore the description thereof will be omitted.

In the shutdown process of the fifth embodiment, as shown in FIG. 29, it is first confirmed that the front side copy is being performed in the double sided copy operation, and the double side power-off control is confirmed. Then, in step 801,
It is determined whether or not the transfer paper remains in the image forming apparatus. If not, the process is reset and ended. If it remains, the process proceeds to step 803, and it is determined whether or not the transfer paper is the image formation completed. To be done. Then, in step 803, when the transfer sheet has completed image formation, in step 805, the sheet is moved to a predetermined place for double-sided copying, and the process returns to step 801. Here, the above-mentioned predetermined location for double-sided use means, as shown in FIG.
When performing double-sided copying only with the copying machine main body (I), the transfer paper is guided downward by the switching claw 67,
Further, it is guided downward by the switching claw 68, and the switching claw 69
And the tray 70 guided by the re-feeding loop 72,
When the double-sided copy is performed using the double-sided reversing unit (IV), the double-sided reversing unit (IV) is fed by the switching claw 67. Next, in step 803, when the transfer sheet is not the one on which image formation is completed,
In step 807, by the switching claw 67,
The transfer sheet is not moved to the predetermined location for double-sided copying, the transfer sheet is sent to the discharge bin 111 and discharged, and the process returns to step 801. Then, the above steps 805, 8
The routine returning from 07 to step 801 is performed until there is no transfer paper in the machine. Steps 805 and 80 above
The processing in 7 is performed by the main C via the double-sided control plate 165, the ADF control plate 169, the scanner control circuit 157, and the like.
It is performed under the control of the PU 141.

The shutdown process of the fifth embodiment as described above can be used in combination with the shutdown process of the first, second, third and fourth embodiments as appropriate.

Next, a sixth embodiment of the image forming apparatus (copy) according to the present invention will be described. The sixth embodiment is different from the first embodiment only in the shutdown process, and the other constitutional operation is the same as that of the first embodiment, and therefore the description thereof will be omitted.

As shown in FIG. 30, the shutdown process of the sixth embodiment is performed by the uninterruptible power supply unit 14 as described above.
When the cutoff detection signal is sent from step 5, it is determined in step 901 whether transfer paper remains in the image forming apparatus. If it does not remain, the transfer is reset and completed. In step 903, it is determined whether or not the transfer sheet has finished image formation and is being ejected to the ejection bin 111 or the interruption bin of the sorter for image formation completion, or during the image formation. Then, in step 903, when the transfer sheet has completed the image formation, in step 905, the transfer sheet is discharged to the discharge bin 111 or the interrupt bin of the sorter for image formation completion, and the process returns to step 901. .. Next, if it is determined in step 903 that the transfer paper has not been subjected to image formation, the transfer paper is identified in step 907 as a specific bin designated as a bin for incomplete image formation, such as bin 11.
Emitted to 1x. Then, the above steps 905, 90
The routine of returning from step 7 to step 901 is performed until there is no transfer sheet in the machine. The processing in steps 905 and 907 is performed by the control of the main CPU 141 via the ADF control plate 169 and the scanner control circuit 157.

The shutdown process of the sixth embodiment as described above is performed in the first, second, third, fourth and fifth steps.
It can be used in combination with the shutdown process of the embodiment.

[0135]

As described above, according to the present invention, even when a power failure or a momentary interruption for a long period of time occurs in a commercial power source, an uninterruptible power source is provided to control the supply of the uninterruptible power source to various places. By performing the shutdown process, it is easy to restart after the power failure. In other words, by performing the shutdown process, the power consumption is reduced, the power supply time by the uninterruptible power supply is extended, the user is notified that the commercial power supply has been cut off, and the transfer paper being copied is not discharged inside the machine. To complete the initialization of the photoconductor so as not to adversely affect the photoconductor and save various information to the non-volatile memory so that the previous job can be continued easily when the power supply is resumed. Then, in order to prevent deterioration due to over-discharge of the battery, power supply can be stopped.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a digital copying machine embodying the present invention.

2A and 2B are a plan view and a side view of a writing unit in the digital copying machine shown in FIG.

3A and 3B are a layout diagram and an optical path diagram of the writing unit shown in FIG.

FIG. 4 is a functional block diagram of an electrical equipment control unit in the copying machine shown in FIG.

5 is a left half view of an entire block of an electrical equipment control unit in the copying machine shown in FIG.

6 is a right half diagram of an overall block of an electrical equipment control unit in the copying machine shown in FIG.

7 is a block diagram of the image scanner unit shown in FIG. 1. FIG.

FIG. 8 is a schematic block diagram of an image processing unit.

9 is a diagram showing an example of data depth switching in the unit shown in FIG.

FIG. 10 is a block diagram of a memory system.

11 is an operation explanatory diagram of the memory system shown in FIG.

12 is an explanatory diagram of the operation of the memory system shown in FIG.

FIG. 13 is a block diagram showing a peripheral configuration of a memory unit.

FIG. 14 is an internal configuration diagram of the memory unit shown in FIG.

FIG. 15 is a diagram showing a data type of image data.

FIG. 16 is a block diagram showing another example of the peripheral configuration of the memory unit.

FIG. 17 is a diagram showing an example of using an external storage device for storing image data.

FIG. 18 is a block diagram showing another example of the peripheral configuration of the memory unit.

FIG. 19 is a block diagram showing an internal configuration of an uninterruptible power supply which is a feature of the present invention.

FIG. 20 is a diagram showing a sequence when the commercial power source is shut off.

21 is a flowchart showing the overall operation of the copying machine shown in FIG.

FIG. 22 is a flow chart diagram illustrating a shutdown process that is a feature of the present invention.

FIG. 23 is a time chart showing the operation of each part of the copy process and the shutdown process.

FIG. 24 is a diagram showing a fixing temperature characteristic of transfer paper.

FIG. 25 is a diagram showing a display example of a display unit in a shutdown process.

FIG. 26 is a flowchart of a shutdown process according to the second embodiment of the present invention.

FIG. 27 is a flowchart diagram of a shutdown process according to a third embodiment of the present invention.

FIG. 28 is a flow chart diagram of a shutdown process according to a fourth embodiment of the present invention.

FIG. 29 is a flowchart diagram of a shutdown process according to a fifth embodiment of the present invention.

FIG. 30 is a flow chart diagram of a shutdown process according to a sixth embodiment of the present invention.

[Explanation of symbols]

1 reflector, 3 light source, 8 solid-state image sensor, 9
Contact glass, 40 photoconductor drum, 42 developing device, 43 toner replenishing device, 44 transfer charger,
45 Separation Charger, 49 Static Elimination Lamp, 50 Photo Sensor, 60 Cassette, 62 Registration Roller, 64 Heat Roller, 65 Pressure Roller, 6
7, 68, 69 Switching Claw, 70 Tray, 72 Refeed Loop, 100 Document Feeding Table, 101 Side Guide, 102 Conveyor Belt, 103 Discharge Tray, 1
10 Motor, 111 Bin, 120 Paper Ejection Roller, 123 Tray, 124 Refeed Roller, 140
1st CPU (sequence CPU), 141 2nd C
PU (main CPU), 145 uninterruptible power supply unit, 151 main control board, 153, 155 RO
M, 156 RAM, 157 scanner control circuit,
159 AC drive board, 161 Paper feed control board, 16
3 sorter control board, 165 double-sided control board, 167 display section, 169 ADF control board, 171 initialization drive, 173 bias control board, 181 power supply monitoring circuit, 183 battery section, 185 DC / AC,

Claims (10)

[Claims] 1. An image forming apparatus for reading an image from a document on the basis of a power source from a commercial power source and forming the image on a transfer means, and when the power source from the commercial power source is cut off, When the power interruption is detected and the power interruption is detected by the uninterruptible power supply means for supplying the power for a predetermined time after the power interruption, and the uninterruptible power supply means is determined in advance from the normal image forming processing. A power-off process (shutdown process) is executed, and after the power-off process is finished, a control means for controlling the power supply from the uninterruptible power supply means to be cut off is provided. Image forming apparatus. 2. The power cutoff process performed by the control means comprises a process for facilitating a restart after the power cutoff from the commercial power source is completed. The image forming apparatus described. 3. The image forming apparatus according to claim 2, wherein the power-off time processing performed by the control means is processing for extending the power supply time from the uninterruptible power supply means. 4. The image forming according to claim 3, wherein the power-off processing performed by the control means is processing for turning off a fixing heater for fixing an image on the transfer means. apparatus. 5. The image forming apparatus according to claim 4, wherein the power-off process performed by the control means is a process for displaying to a user that commercial power has been shut down. 6. The image forming apparatus according to claim 5, wherein the power-off process performed by the control unit is a process for discharging the transfer unit during transfer so that the transfer unit does not remain in the apparatus. 7. The power-off process performed by the control means is a process for initializing a photoconductor for temporarily holding an image from the original.
The image forming apparatus according to item 1. 8. The power-off process performed by the control means is a process of holding various information during a power failure in order to facilitate restarting after the power-off from the commercial power source is completed. The image forming apparatus according to claim 7, which is characterized in that. 9. The power-off process performed by the control means is a process of transporting the document to a predetermined reading position and a predetermined discharging position.
The image forming apparatus according to item 1. 10. The power-off processing performed by the control means is processing for setting a fixing heater for fixing an image on the transfer means to a predetermined temperature lower than a normal temperature. The image forming apparatus according to item 1.