JP4293568B2 - Image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a plurality of digitally controlled power supply circuits that output a DC voltage, a plurality of electric loads that are supplied with a DC voltage from each power supply circuit, and an apparatus operation by sequence driving of the electric load in response to an external input. The present invention relates to an electrical device comprising a controller for starting Specific examples of this electrical device are, but are not intended to be limited to, copiers, printers and facsimile machines. Many other electronic controls that require a low voltage, such as 5V, for driving a computer or electronic circuit and a relatively high voltage, such as 12V, 24V, or 38V, that energizes an electric actuator or heater such as an electric motor or solenoid. There are electrical equipment.
[0002]
[Prior art]
  For example, as a power saving measure for a copying machine, a power saving mode for saving power consumption during standby compared to normal operation is conventionally provided. The power saving mode is a state in which, when there is no operation of the copying machine for a certain period of time, only power supply to the controller necessary for system status monitoring is left, and power supply to other than this controller is turned off. Except for the minimum controller necessary for status monitoring, all the power supply is turned off, and the power supply to the fixing heater is also turned off, so that the power consumption during standby of the copying machine is significantly reduced.
[0003]
[Problems to be solved by the invention]
  Looking at the integrated value of power consumption of the copier, the proportion of power consumption during standby is large, and the conventional method as described above has been taken to reduce the amount of power consumption during standby. However, there is still room for improvement.
[0004]
  The present invention aims to further reduce power consumption, and specificallyWaitThe purpose is to further reduce power consumption by reducing power consumption.
[0005]
[Means for Solving the Problems]
  (1) A switching power supply (80 dc) including a plurality of digitally controlled switching power supply circuits (PC1 to PC9) for outputting a DC voltage and a power supply output controller (85) for controlling the generation of each of these DC voltages ); A plurality of electric loads that are supplied with a DC voltage of each switching power supply circuit; and an operating voltage supplied from at least one of the switching power supply circuits (PC1) and in response to an input from the outside, the electric loads A device operation controller (60) for starting device operation by sequence driving ofImage formationA device,
  Device operation controller (60) generates DC voltage of one or more switching power supply circuits (PC1 to PC9) (PC2 to PC9) to power supply output controller (85)start/ Stop command, and the power output controller (85) generates the DC voltage of the switching power circuit (PC2 to PC9) in response to the commandstart/ Control stopImage formationapparatus.
[0006]
  In addition, in order to make an understanding easy, the symbol of the corresponding element of the Example shown to a drawing and mentioned later or an equivalent element is added in the parenthesis for reference. The same applies to the following.
[0007]
  According to this, each DC voltage is switched in the switching power supply circuit (PC2 to PC9)., Start / stop generationON / OFF at the generation stage,Therefore, unnecessary power can be prevented from being generated in the power supply circuits (PC2 to PC9), and there is an effect of saving power. It is possible to realize an electric device, for example, a printer or a copier, that has a smaller integrated value of power consumption.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
  (2) initial power supply means (RA1, 83, 84) for supplying power to the power output controller (85) in response to turning on of the main power supply (AC) for supplying power to the plurality of switching power supply circuits (PC1 to PC9); Further, the power supply output controller (85) receives all of the initial power supply from the initial power supply means.ofDC voltage generationStartTo do.
[0009]
  According to this, when the original power supply (AC) is turned on, the initial power supply means (RA1, 83, 84) supplies power to the power supply output controller (85). That is, the power supply output controller (85) is turned on. And power supply output controller (85) is all of switching power supply circuit (PC1 ~ PC9)ofDC voltage generationStartAs a result, all the electric loads can be driven.
[0010]
  (3) The device operation controller (60) determines the physical state of the electric load or the position of the object driven by the electric load when the DC voltage provided by the switching power supply circuit (PC1) rises from the off state to the operating voltage. Homing that is addressed to the waiting time, in (2) aboveImage formationapparatus.
[0011]
  According to this, all DC voltages are generated immediately after the main power supply (AC) is turned on, and the homing operation of each part is performed by supplying the DC voltage. After the homing operation is completed, even if the power supply to each part that does not require power supply is cut off, or when power is supplied from the next time when operation is required, correct processing can be performed from the correct position without problems. it can.
[0012]
  (4) After completing the homing, the device operation controller (60) instructs the power supply output controller (85) to stop generating the DC voltage of the switching power supply circuit (PC6 to PC9) that supplies power to the electric load that does not require power supply. Of (3) aboveImage formationapparatus.
[0013]
  After the homing operation is completed, the power of each part that does not require power supply is temporarily cut off, so that when the next operation is requested, even if power is supplied from there, correct processing can be performed from the correct position without any problems. .
[0014]
  (5) Stores delay time data from when the device operation controller (60) issues a DC voltage generation instruction for the switching power supply circuit (PC9) to when the output of the switching power supply circuit (PC9) rises to the set value. The device operation controller (60) instructs the power supply output controller (85) to generate a DC voltage of the switching power supply circuit (PC9) in response to an input from the outside. After the elapse of the delay time of (60), driving of the electric load fed from the switching power supply circuit (PC9) is started; any one of (1) to (4) aboveImage formationapparatus.
[0015]
  (6FeelingPhotoconductor (114), charger (119) that charges the photoconductor, exposure device (141-146) that exposes image light onto the charged surface of the photoconductor, and developer that visualizes the electrostatic latent image generated by exposure (120), means (115, 116, 117) for transferring the visible image onto the transfer paper, a fixing device (123) for fixing the visible image on the transfer paper to the transfer paper, and an electric actuator for driving these image forming elements And electrical circuit (4)Mu, above(1) to (5)Image formationapparatus.
[0016]
  According to this, the image forming apparatus (printer 100) having the effects described in the above (1) to (5) is realized.
[0017]
  (7) Furthermore, the image scanner (10) for reading the image of the document is further provided.Image formationapparatus.
[0018]
  According to this, an image forming apparatus (copier FIG. 1) having the effects described in the above (1) to (5) is realized.The
[0019]
BookOther objects and features of the invention will become apparent from the following description of embodiments with reference to the drawings.
[0020]
【Example】
  FIG. 1 shows the appearance of a digital copying machine which is an embodiment of the present invention. This digital copying machine is roughly an automatic document feeder [ADF] 30, an operation unit 20, a color scanner 10, a color printer 100, a relay unit 32, a stapler and a large amount of imaged paper. The unit includes a finisher 34 with a shift tray, a duplex reversing unit 33, a paper feed bank 35, a large-capacity paper feed tray 36, and a 1-bin paper discharge tray 31.
[0021]
  FIG. 2 shows the configuration of the color printer 100. The writing optical unit as the exposure unit converts the color image data from the scanner 10 into an optical signal, performs optical writing corresponding to the original image, and forms an electrostatic latent image on the photosensitive drum 114. The optical writing optical unit includes a laser light emitter 141, a light emission drive control unit (not shown) that drives and emits the light, a polygon mirror 143, a rotation motor 144 that rotationally drives this, an fθ lens 142, a reflection mirror 146, and the like. ing. The photosensitive drum 114 rotates counterclockwise as indicated by an arrow. Around the photosensitive drum 114, a photosensitive member cleaning unit 121, a charge eliminating lamp 114M, a charger 119, and a latent image potential on the photosensitive drum are detected. A potential sensor 114D, a selected developer of the revolver developing device 120, a development density pattern detector 114P, an intermediate transfer belt 115, and the like are arranged.
[0022]
  The revolver developing device 120 includes a BK developing device 120K, a C developing device 120C, an M developing device 120M, a Y developing device 120Y, and a revolver rotation driving unit (not shown) that rotates each developing device in a counterclockwise direction as indicated by an arrow. (Omitted). Each of these developing devices pumps up the developing sleeves 120KS, 120CS, 120MS, 120YS, which rotate by bringing the ears of the developer into contact with the surface of the photosensitive drum 114, in order to visualize the electrostatic latent image. It consists of a developing paddle that rotates for stirring. In the standby state, the revolver developing device 120 is set at a position where development is performed by the BK developing device 120. When the copying operation is started, the scanner 10 starts reading BK image data at a predetermined timing. Based on the data, laser writing and latent image formation are started. Hereinafter, an electrostatic latent image based on Bk image data is referred to as a Bk latent image. The same applies to C, M, and Y image data. In order to enable development from the leading edge of the Bk latent image, before the leading edge of the latent image reaches the developing position of the Bk developing device 120K, the developing sleeve 120KS starts to rotate, and the Bk latent image is developed with Bk toner. . Thereafter, the developing operation of the Bk latent image area is continued. When the trailing edge of the latent image has passed the Bk latent image position, the developing operation is immediately performed from the developing position by the Bk developing device 120K by the developing device for the next color. The revolver developing device 120 is driven and rotated to the position. This rotation operation is completed at least before the leading edge of the latent image by the next image data arrives.
[0023]
  When the image forming cycle is started, the photosensitive drum 114 rotates counterclockwise as indicated by an arrow, and the intermediate transfer belt 115 rotates clockwise by a drive motor (not shown). As the intermediate transfer belt 115 rotates, BK toner image formation, C toner image formation, M toner image formation, and Y toner image formation are sequentially performed. Finally, intermediate transfer is performed in the order of BK, C, M, and Y. A toner image is formed over the belt 115. The BK image is formed as follows. That is, the charger 119 uniformly charges the photosensitive drum 114 to about −700 V with a negative charge by corona discharge. Subsequently, the laser diode 141 performs raster exposure based on the Bk signal. When the raster image is exposed in this manner, the charge proportional to the exposure light amount disappears in the exposed portion of the uniformly charged photosensitive drum 114, and an electrostatic latent image is formed. The toner in the revolver developing device 120 is negatively charged by stirring with the ferrite carrier, and the BK developing sleeve 120KS of the developing device is connected to the metal base layer of the photosensitive drum 114 by a power supply circuit (not shown). It is biased to a potential in which a negative DC potential and an AC are superimposed. As a result, the toner does not adhere to the remaining portion of the photosensitive drum 114, and Bk toner is adsorbed to the uncharged portion, that is, the exposed portion, so that Bk visible similar to the latent image. An image is formed. The intermediate transfer belt 115 is stretched around a driving roller 115D, a transfer counter roller 115T, a cleaning counter roller 115C, and a driven roller group, and is rotated by a driving motor (not shown). A Bk toner image formed on the photosensitive drum 114 is applied to a belt transfer corona discharger (hereinafter referred to as a belt transfer unit) 116 on the surface of an intermediate transfer belt 115 that is driven at a constant speed in contact with the photosensitive member. Is transcribed by. Hereinafter, the toner image transfer from the photosensitive drum 114 to the intermediate transfer belt 115 is referred to as belt transfer. Some untransferred residual toner on the photosensitive drum 114 is cleaned by the photosensitive member cleaning unit 121 in preparation for reuse of the photosensitive drum 114. The toner collected here is stored in a waste toner tank (not shown) via a collection pipe.
[0024]
  In addition, on the intermediate transfer belt 115, Bk, C, M, and Y toner images that are sequentially formed on the photosensitive drum 114 are sequentially aligned on the same surface to form a four-color superimposed belt transfer image. Thereafter, batch transfer is performed on the transfer paper with a corona discharge transfer device. By the way, on the photosensitive drum 114 side, the process proceeds to the C image forming process after the BK image forming process. At a predetermined timing, reading of C image data by the scanner 10 is started, and laser light writing by the image data is performed. Then, a C latent image is formed. The C developing device 120C rotates the revolver developing device after the rear end of the previous Bk latent image has passed with respect to the developing position and before the front end of the C latent image has arrived. Develop the image with C toner. Thereafter, the development of the C latent image area is continued. When the trailing edge of the latent image passes, the revolver developing device 120 is driven and the C developing device 120C is sent out in the same manner as in the previous Bk developing device. The M developing device 120M is positioned at the developing position. This operation is also performed before the leading edge of the next M latent image reaches the developing unit. It should be noted that the image forming process for each of the M and Y images will not be described because the image data reading, latent image forming, and developing operations are in accordance with the Bk image and C image processes described above.
[0025]
  The belt cleaning device 115U includes an inlet seal, a rubber blade, a discharge coil, and a contact / separation mechanism for the inlet seal and the rubber blade. After transferring the first color Bk image to the belt, while transferring the second, third, and fourth color images to the belt, the blade seal mechanism separates the inlet seal, rubber blade, etc. from the intermediate transfer belt surface. deep.
[0026]
  A paper transfer corona discharger (hereinafter referred to as a paper transfer unit) 117 transfers AC + DC or DC components to the transfer paper and the intermediate in a corona discharge system in order to transfer the superimposed toner image on the intermediate transfer belt 115 onto the transfer paper. This is applied to the transfer belt.
[0027]
  Various sizes of transfer paper are stored in the transfer paper cassette 182E and the paper supply bank 35, and the paper stored in the designated size is fed in the direction of the registration roller pair 118R by the paper supply roller 183E or the like. Paper / conveyed. Reference numeral 112B2 denotes a paper feed tray for manually feeding OHP paper, cardboard, or the like. At the time when the image formation is started, the transfer paper is fed from one of the paper feed trays and stands by at the nip portion of the registration roller pair 418R. When the leading edge of the toner image on the intermediate transfer belt 115 approaches the paper transfer unit 117, the registration roller pair 118R is driven so that the leading edge of the transfer paper coincides with the leading edge of the image, and the paper and the image are transferred. Matching is done. In this way, the transfer paper is superimposed on the color superposition image on the intermediate transfer belt and passes over the paper transfer device 117 connected to a positive potential. At this time, the transfer paper is charged with a positive charge by the corona discharge current, and most of the toner image is transferred onto the transfer paper. Subsequently, when the paper passes through a separation static eliminator (not shown) disposed on the left side of the paper transfer unit 117, the transfer paper is neutralized, peeled off from the intermediate transfer belt 115, and transferred to the paper conveyance belt 122. The transfer paper onto which the four-color superimposed toner images are collectively transferred from the surface of the intermediate transfer belt is conveyed to the fixing device 123 by the paper conveyance belt 122, and the toner is transferred to the nip portion between the fixing roller 123A and the pressure roller 123B controlled to a predetermined temperature. The image is fused and fixed, sent out of the main body by a pair of discharge rollers 124, and stacked face up on a copy tray (not shown).
[0028]
  Inside the fixing roller 123A, there is a fixing heater (halogen lamp) 123C. The fixing heater 123C is energized by a fixing energizing circuit 85 (FIG. 4), whereby the fixing heater 123C generates heat and generates infrared rays. Then, the fixing roller 123C is heated.
[0029]
  The surface of the photosensitive drum 114 after the belt transfer is cleaned by a photosensitive member cleaning unit 121 including a brush roller, a rubber blade, and the like, and is uniformly discharged by a discharging lamp 114M. Further, the intermediate transfer belt 115 after the toner image is transferred to the transfer paper is again cleaned by pressing the blade with the blade contact / separation mechanism of the cleaning unit 115U. In the case of repeat copying, the operation of the scanner and the image formation on the photosensitive member are continued to the fourth color image process for the first sheet, and then proceed to the first color image process for the second sheet at a predetermined timing. In the intermediate transfer belt 115, the second Bk toner image is belt-transferred to the area where the surface is cleaned by the belt cleaning device following the batch transfer process of the first four-color superimposed image onto the transfer paper. So that After that, the operation is the same as the first sheet.
[0030]
  FIG. 3 shows an outline of the electric system of the copying machine shown in FIG. One MPU 51 on the main control plate 50 and one CPU 12 on the scanner control plate 11 are used as a copier mechanical control unit, that is, a main part of image reading and image forming process control. The MPU 51 performs image-related sequence and fixing control and system-related control, and the CPU 12 performs scanner-related control. The MPU 51 and the CPU 12 are connected by an image data interface and a serial interface.
[0031]
  In FIG. 3, 20 is an operation unit, 70 is an I / O control board, 92 is an LD control board for controlling laser light for image exposure, 41 is a paper feed control board, and 13 is a reading control board on which a CCD is mounted. , 90 is a motherboard, 60 and 91 are application expansion units for realizing a composite function, 91 is a facsimile control unit equipped with a FAX function, 60 is a printer function for printing a document of a host such as a personal computer or word processor, and the like. A printer controller (board) for controlling a composite operation mode of copying, facsimile, and printer. Reference numeral 80 denotes a power supply device.
[0032]
  On the DC power supply / AC control plate 80, there are a switching power supply unit 80dc that generates DC voltages of several voltage values, and a heater energization circuit (AC output) that controls the fixing temperature by supplying commercial AC to the fixing heater. .
[0033]
  FIG. 4 shows an outline of the switching power supply unit 80dc on the DC power supply / AC control board 80 and an outline of the electric load fed by it. The switching power supply unit 80dc includes a filter 81 for removing AC AC noise fed by closing (on) an unillustrated original power switch (AC input switch), a rectifying / smoothing circuit 82 for rectifying and smoothing the AC voltage, and a DC voltage Each DC voltage generator PC1 to PC9 that performs generation, a digital controller (using a digital signal processor DSP) 85 that controls voltage generation (generation / stop and output power) of each DC voltage generator, and an original power switch are opened A switch circuit (SW) 83 that is turned on when the AC power supply AC is applied to the switching power supply unit 80 dc and a DC voltage appears in the rectifying and smoothing circuit 82 and the battery 84 is applied to the DSP 85. When this switch circuit 83 is turned on, the battery that supplies the necessary power supply voltage to the DSP 85 Consisting of 4.
[0034]
  Each of the DC voltage generators PC1 to PC9 is connected to a load such as a scanner motor or an ADF (automatic document feeder) and supplies a necessary voltage to each load. The DSP 85 of the switching power supply unit 80 dc communicates with the printer controller 60 mounted on the motherboard 90 by UART (Universal Asynchronous Receiver Transmitter: Serial communication). Although not shown, the printer controller 90 is a computer system including a CPU, a nonvolatile memory, a ROM, a RAM, and an image memory.
[0035]
  FIG. 5 shows a configuration of the switching circuit 83 and the 5V generation unit PC1 of the switching power supply unit 80dc. A 100 V commercial AC voltage is applied from the AC input terminals IN1 and IN2 to the rectifying and smoothing circuit 82 through the noise filter 81 when a main power switch (not shown) is turned on. The noise filter 81 has an input filter that blocks high-frequency noise of the 100V commercial AC line from entering the switching power supply unit 80dc and prevents high-frequency noise generated by the switching power supply unit 80dc from leaking to the commercial AC line. . The AC voltage is applied through this input filter to a rectifying / smoothing circuit 82 including a full-wave rectifying diode bridge and a smoothing capacitor.
[0036]
  Further, the AC voltage is also applied to a starting circuit composed of a resistor R1 and a relay RA1. When AC voltage is applied, the relay contact RA1 closes the relay contact inserted between the diode D4 of the switch circuit (SW) 83 and the operating voltage input terminal Vcc of the DSP 85 of the relay RA1. Since the diode D4 is connected to the battery 84, the battery voltage is applied to the DSP 85, whereby the DSP 85 is activated and outputs the first to ninth PWM pulses to the 5V generator PC1 to 38V generator PC9, respectively. .
[0037]
  As a result, all of the 5V generators PC1 to 38V generator PC9 are in an operating state, and generate the DC voltages shown in FIG. Hereinafter, the 5V generation unit PC1 will be described as an example.
[0038]
  The output DC voltage of the rectifying / smoothing circuit 82 is applied to the primary winding of the transformer TR1 in the 5V generator PC1. When the switching element FET1 is turned on, a current flows from the rectifying / smoothing circuit 82 to the primary side ground via the primary winding, the switching element FET1 and the current value detection circuit ISEN1.
[0039]
  In the current value detection circuit ISEN1, the current flowing through the FET 1 flows through the current detection resistor, and the voltage of the resistor is proportional to the primary current. This voltage is a primary current detection signal, and the current value detection circuit ISEN1 generates a signal indicating an overcurrent and gives it to the DSP 85 when the detection signal exceeds a set level. In response to this, the DSP 85 turns off the FET1. When the next PWM pulse output period is reached, the FET 1 is turned on. That is, output of a new PWM pulse is started.
[0040]
  The drive circuit DRIV1 is connected to a PWM output port that outputs a first PWM pulse that is a switching ON / OFF signal of the DSP 85. DRIV1, transformer TR1 and switching element FET1 constitute a primary side switch circuit, and the output voltage of rectifying and smoothing circuit 82 is chopped by switching in response to the PWM pulse, and the primary winding of transformer TR1 is pulse-energized.
[0041]
  On the secondary side of the transformer TR1, there is an output circuit that converts a pulse voltage induced in the secondary winding into a direct current and outputs it. The output circuit includes diodes D1 and D2, choke coil CH1, secondary side overcurrent detection circuit ISEN2 that detects secondary side overcurrent, output voltage detection circuit VSEN1, and a smoothing capacitor.
[0042]
  The secondary-side overcurrent detection circuit ISEN2 is configured to convert the current flowing through the output circuit of the 5V generation unit PC1 into a voltage (secondary current detection signal) corresponding to the magnitude of the current, and output it from ISEN2. The voltage (secondary current detection signal) is applied to the A / D conversion input port of the DSP 85. When the secondary overcurrent detection circuit ISEN2 detects an overcurrent or the output voltage detection circuit VSEN1 detects an overvoltage, the DSP 85 turns off the FET1 and stops the PWM pulse output.
[0043]
  The same applies to the configurations and operations of the circuits PC2 to PC9 that generate the other voltage values, and the control operation of the DSP 85 for them. However, the generation circuit having a large power capacity of the generation circuit is such that a plurality of switching element FETs are used in parallel connection, or a thermistor for protecting the temperature of the circuit is added and the voltage (temperature) is given to the DSP 85. For example, temperature abnormalities are monitored.
[0044]
  Next, DC power supply output control by the printer controller 60 will be described. Note that the CPU and MPU that monitor input even in the energy saving standby mode of the printer controller 60, the I / O control board 70, and the main control board 50, and a circuit that generates an external input signal in the energy saving standby mode include a 5V generator PC1. Power.
[0045]
  FIG. 6 responds to the voltage rise of the first generation unit PC1 when the output of all the generation units PC1 to PC9 rises to a predetermined voltage or higher due to switching of the original power switch from OFF to ON. The control operation of the printer controller 60 will be described.
[0046]
  When the original power switch of the copier is turned on, the AC power AC is input to the switching power supply unit 80dc. The AC power supply passes through the filter with noise 81 and is full-wave rectified by the rectifying / smoothing circuit 82. When the output voltage exceeds the set value, the current flowing through the electric relay coil RA1 causes the relay contact RA1 of the switch circuit 83 to close.
[0047]
  As a result, the voltage accumulated in the battery 84 is supplied to the DSP 85, and the DSP 85 is activated. The DSP 85 first starts outputting a PWM pulse to the 5V generation unit PC1, whereby the 5V generation unit PC1 generates a 5V voltage. The generated 5V voltage is applied to the CPU and MPU that monitor input even in the energy saving standby mode and the circuit that generates an external input signal in the energy saving standby mode of the printer controller 60, the I / O control board 70, and the main control board 50. Is done. The primary winding of the transformer TR1 is excited by turning on / off the FET 1 in response to the PWM pulse. As a result, the tertiary winding connected to the switch circuit 83 induces a voltage, which is rectified by the diode D3 and smoothed by the capacitor C2. The voltage is converted to a constant voltage by the constant voltage circuit CV1, and the driving voltage for the DSP is supplemented through the diode D5.
[0048]
  Referring to FIG. 6, in response to the output of the 5V generation unit PC1 rising from 0V to 5V, the CPU of the printer controller 60 is activated, and in the flow shown in the flowchart of FIG. The UART communication is used to instruct the DSP 85 to turn on the generation of all DC voltages (PC1 to PC9). Upon receiving the command, the DSP 85 turns on all the DC voltage generation units (PC1 to PC9). Here, the ON of the first generation unit PC1 means the start of the power output control of the DSP 85 according to the command (control) of the CPU of the printer controller 60 from the start operation of the ON response of the original power switch.
[0049]
  When all the generators PC1 to PC9 are started up, that is, when each output voltage is equal to or higher than each set value, the DSP 85 notifies the CPU of the printer controller 60 that the DC voltage has risen (ready) by UART communication. The above is the content of Step 1 in FIG.
[0050]
  The CPU of the printer controller 60 instructs each part of the copying machine to execute a homing operation for adjusting a homing position such as a scanner position and a FIN (finisher) tray position (step 2). In the following, the word “step” is abbreviated in parentheses, and step no. Write numbers only.
[0051]
  When the homing operation is finished, the CPU of the printer controller 60 checks whether or not the power saving level 2 is set (3), and if it is set, it is a DC voltage that does not need to be generated. The DSP 85 is instructed to stop the DC voltage generation of the 24V generator PC6, 24V generator PC7, 38V generator PC8 and 38V generator PC9 surrounded by the chain line. In response to this, the DSP 85 stops the voltage generation control of the generation units PC6 to PC9 (4). This is done by opening the PWM pulse output ports to these generators PC6 to PC9 to the FET off instruction level and stopping the PWM pulse output to them. Thereby, the power consumption inside the generation units PC6 to PC9 is substantially eliminated.
[0052]
  Thereafter, normal processing (5) of the copying machine is performed. Normal copying machine operations are well known and will not be described. As is well known in this normal process (5), when there is no copy or print instruction, there is no operation in the operation unit 20, and the set time elapses, the CPU of the printer controller 60 sets the energy saving standby mode. In this embodiment, the DSP 85 is further commanded to stop the DC voltage generation of the generators PC2 to PC5. In response to this, the DSP 85 stops the voltage generation control of the generation units PC2 to PC5. Thereby, the power consumption inside the generation units PC2 to PC5 is substantially eliminated.
[0053]
  Reference is now made to FIG. When the copying machine is warmed up and scanning is set in a copy-ready state, for example, when a document is placed on the windshield and the copy start key is pressed, the CPU of the printer controller 60 sets the scanning setting. It is determined that it has been made, and the DSP 85 is commanded to turn on DC voltage generation of the 38V generator PC9 (11, 12). In response to this, the DSP 85 starts PWM pulse output to the 38V generator PC9, and the 38V generator PC9 supplies a 38V voltage to the motor driver of the scanner motor. Based on the delay time data until the 38V voltage of the 38V generator PC9 rises in the nonvolatile memory inside the printer controller 60, the CPU of the printer controller 60 issues an ON command to the 38V generator PC9. The clock pulses are counted until the time corresponding to the delay time data has passed. That is, time is measured. If the delay time has passed, a command to start the scanner is sent to the motor control unit on the scanner control board 11.
[0054]
  When the scanning of the original is finished and the scanner operation is no longer necessary, the CPU of the printer controller 60 instructs the DSP 85 to stop the 38V voltage generation of the 38V generation unit PC9 when it becomes unnecessary (13, 14). The DSP 85 stops the 38V voltage generation control of the 38V generator PC9. Thereafter, the CPU of the printer controller 60 performs normal processing of the copying machine.
[0055]
  Please refer to FIG. Similarly, if a document is set on the ADF (automatic document feeder) 30 and the copy start key is pressed, it is determined that ADF has been set, and the CPU of the printer controller 60 determines that the 38V generator PC8 and the 24V voltage generator. Command to generate voltage of PC7 (21, 22). In response to this, the DSP 85 generates and controls 38V voltage and 24V voltage. As a result, 38V voltage and 24V voltage are supplied to the ADF 30.
[0056]
  The CPU of the printer controller 60 determines the ON command based on the delay time data until both the 38V voltage of the 38V generator PC8 and the 24V voltage of the 24V generator PC7 are stored in the nonvolatile memory in the controller 60. The time is measured until the time for the delay time data has passed since the departure. If it passes, an ADF operation enable command is given to the ADF 30.
[0057]
  When an original is set in the ADF 30 and the copy start key is pressed, the scanner also moves at the same time, so scan setting is also performed at the same time. Since the operation at the time of scan setting is as described above, a description thereof is omitted here.
[0058]
  When all the documents set in the ADF are sent, the ADF is not set, and the CPU of the printer controller 60 instructs the DSP 85 to stop the voltage generation of the 38V generation unit PC8 and the 24V voltage generation unit PC7 (23). , 24). In response to this, the DSP 85 stops the generation control of the 38V voltage and the 24V voltage. That is, power supply to the ADF 30 is stopped.
[0059]
  Reference is now made to FIG. The same applies to the use of FIN (finisher). When the peripheral machine FIN is connected to the copying machine main body and the paper is discharged, the CPU of the printer controller 60 determines the FIN setting. The subsequent processing is the same as that for scan setting and ADF setting.
[0060]
  The copying machine of this embodiment has a power saving mode 1. This means that when the copier is not used for a long time, only the 5V voltage of the 5V generator PC1 is left, the other DC voltages are turned off, and although not shown, the AC power supply to the fixing heater is turned off, In this mode, a low power consumption state is realized. The power saving mode 1 automatically shifts when the copying machine is not operated for a preset time. Alternatively, when the power subkey on the operation unit 20 is pressed for a few seconds, the process proceeds. To cancel 1, press the power subkey for a few seconds.
[0061]
  FIG. 10 shows power control of the CPU of the printer controller 60 corresponding to the setting / cancellation of the power saving mode 1. When the set time elapses without using the copying machine, or when there is an instruction to shift to the power saving mode by the power subkey, the CPU of the printer controller 60 sets the power saving mode 1 and sets the DSP 85 other than the 5V generator PC1. The DC voltage generation (PC2 to PC9) is instructed to stop (41, 42). When the power saving mode 1 is set, if the power sub key is pressed for a few seconds, or if there is an operator operation on the copying machine or a print command from the host (personal computer), the CPU of the printer controller 60 1 is released, and the DSP 85 is instructed to generate DC voltages of the generators PC2 to PC5 (43, 44).
[0062]
【The invention's effect】
  Since individual DC voltages are turned on / off in the switching power supply circuit at the generation stage, unnecessary power can be prevented from being generated in the power supply circuit, and power saving can be achieved. It is possible to realize an electric device, for example, a printer or a copier, that has a smaller integrated value of power consumption.
[Brief description of the drawings]
FIG. 1 is a front view showing an appearance of a color copying machine according to an embodiment of the present invention.
2 is a longitudinal sectional view showing an outline of an internal mechanism of the color printer 100 shown in FIG. 1. FIG.
3 is a block diagram showing a system configuration of an electric system of the copying machine shown in FIG.
4 is a block diagram showing an outline of a switching power supply unit 80dc on the DC power / AC control board 80 shown in FIG. 3. FIG.
5 is a block diagram showing an outline of an electric circuit of a 5V generator PC1 and a switch circuit 83 shown in FIG.
6 is a flowchart showing a first part of ON / OFF control of DC voltage output to the DSP 85 by the CPU of the printer controller 60 shown in FIGS. 3 and 4. FIG.
FIG. 7 is a flowchart showing a second part of ON / OFF control of DC voltage output to the DSP 85 by the CPU of the printer controller 60;
FIG. 8 is a flowchart showing a third part of ON / OFF control of DC voltage output to the DSP 85 by the CPU of the printer controller 60;
FIG. 9 is a flowchart showing a fourth part of DC voltage output ON / OFF control for the DSP 85 by the CPU of the printer controller 60;
FIG. 10 is a flowchart showing a fifth part of DC voltage output ON / OFF control for the DSP 85 by the CPU of the printer controller 60;
[Explanation of symbols]
35: Paper feed bank 36: Mass feed tray
114: Photoconductor 115: Intermediate transfer belt
116, 117: Transcription charger
119: Charger charger
120: Developer 123: Fixing device
143: Polygon mirror
RA1: Electric coil and relay piece of electric relay
DRIV1: Switching driver
ISEN1, 2: Current detection circuit
VSEN1: Voltage detection circuit
CV1: Constant voltage circuit

Claims (6)

A switching power supply comprising a plurality of digitally controlled switching power supply circuits for outputting a DC voltage, and a power supply output controller for controlling the generation of each of these DC voltages; a plurality of DC power supplies received from each switching power supply circuit electrical loads; imaging comprising; and, the supplied operating voltage from at least one of the switching power supply circuit, in response to an input from an external apparatus operation controller starts the device operation by the sequence driving of the electric load A device,
The device operation controller instructs the power supply output controller to start / stop generation of one or more DC voltages of the switching power supply circuit, and the power supply output controller controls generation start / stop of the DC voltage of the switching power supply circuit in response to the instruction. , Image forming apparatus. Initial power supply means for supplying power to the power supply output controller in response to turning on of the main power supply for supplying power to the plurality of switching power supply circuits, and when the power supply output controller receives initial power supply from the initial power supply means, It starts generating all of the DC voltage of the circuit; image forming apparatus according to claim 1. When the DC voltage supplied by the switching power supply circuit rises from the OFF state to the operating voltage, the device operation controller addresses the physical state of the electric load or the position of the object driven by the electric load for standby The image forming apparatus according to claim 2, wherein homing is performed. The image forming apparatus according to claim 3, wherein the apparatus operation controller instructs the power supply output controller to stop generating the DC voltage of the switching power supply circuit that supplies power to an electric load that does not require power supply after the homing is completed. A memory for storing delay time data from when the device operation controller issues a DC voltage generation instruction for the switching power supply circuit to when the output of the switching power supply circuit rises to a set value; Instructing the power supply output controller to generate a DC voltage of the switching power supply circuit in response to the input from the power supply circuit, and after the delay time of the memory elapses, driving of the electric load fed from the switching power supply circuit is started; The image forming apparatus according to claim 1. Photoconductor , charger for charging the same, exposure device for exposing image light to the charged surface of the photoconductor, developer for developing an electrostatic latent image generated by exposure, and means for transferring the developed image to transfer paper a fixing device for fixing the visible image of the transfer paper to the transfer paper, and, according electrical actuator and an electric circuit for driving the imaging elements, the including, on either 請 Motomeko 1 to claim 5 Image forming apparatus.

Images